1 /*
2 * Copyright (c) 2001 The Regents of the University of Michigan.
3 * All rights reserved.
4 *
5 * Kendrick Smith <kmsmith@umich.edu>
6 * Andy Adamson <kandros@umich.edu>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 */
34
35 #include <linux/file.h>
36 #include <linux/fs.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
39 #include <linux/swap.h>
40 #include <linux/pagemap.h>
41 #include <linux/ratelimit.h>
42 #include <linux/sunrpc/svcauth_gss.h>
43 #include <linux/sunrpc/addr.h>
44 #include <linux/jhash.h>
45 #include <linux/string_helpers.h>
46 #include <linux/fsnotify.h>
47 #include <linux/rhashtable.h>
48 #include <linux/nfs_ssc.h>
49
50 #include "xdr4.h"
51 #include "xdr4cb.h"
52 #include "vfs.h"
53 #include "current_stateid.h"
54
55 #include "netns.h"
56 #include "pnfs.h"
57 #include "filecache.h"
58 #include "trace.h"
59
60 #define NFSDDBG_FACILITY NFSDDBG_PROC
61
62 #define all_ones {{ ~0, ~0}, ~0}
63 static const stateid_t one_stateid = {
64 .si_generation = ~0,
65 .si_opaque = all_ones,
66 };
67 static const stateid_t zero_stateid = {
68 /* all fields zero */
69 };
70 static const stateid_t currentstateid = {
71 .si_generation = 1,
72 };
73 static const stateid_t close_stateid = {
74 .si_generation = 0xffffffffU,
75 };
76
77 static u64 current_sessionid = 1;
78
79 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
80 #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
81 #define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
82 #define CLOSE_STATEID(stateid) (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
83
84 /* forward declarations */
85 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
86 static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
87 void nfsd4_end_grace(struct nfsd_net *nn);
88 static void _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps);
89 static void nfsd4_file_hash_remove(struct nfs4_file *fi);
90 static void deleg_reaper(struct nfsd_net *nn);
91
92 /* Locking: */
93
94 /*
95 * Currently used for the del_recall_lru and file hash table. In an
96 * effort to decrease the scope of the client_mutex, this spinlock may
97 * eventually cover more:
98 */
99 static DEFINE_SPINLOCK(state_lock);
100
101 enum nfsd4_st_mutex_lock_subclass {
102 OPEN_STATEID_MUTEX = 0,
103 LOCK_STATEID_MUTEX = 1,
104 };
105
106 /*
107 * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
108 * the refcount on the open stateid to drop.
109 */
110 static DECLARE_WAIT_QUEUE_HEAD(close_wq);
111
112 /*
113 * A waitqueue where a writer to clients/#/ctl destroying a client can
114 * wait for cl_rpc_users to drop to 0 and then for the client to be
115 * unhashed.
116 */
117 static DECLARE_WAIT_QUEUE_HEAD(expiry_wq);
118
119 static struct kmem_cache *client_slab;
120 static struct kmem_cache *openowner_slab;
121 static struct kmem_cache *lockowner_slab;
122 static struct kmem_cache *file_slab;
123 static struct kmem_cache *stateid_slab;
124 static struct kmem_cache *deleg_slab;
125 static struct kmem_cache *odstate_slab;
126
127 static void free_session(struct nfsd4_session *);
128
129 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
130 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
131 static const struct nfsd4_callback_ops nfsd4_cb_getattr_ops;
132
133 static struct workqueue_struct *laundry_wq;
134
nfsd4_create_laundry_wq(void)135 int nfsd4_create_laundry_wq(void)
136 {
137 int rc = 0;
138
139 laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
140 if (laundry_wq == NULL)
141 rc = -ENOMEM;
142 return rc;
143 }
144
nfsd4_destroy_laundry_wq(void)145 void nfsd4_destroy_laundry_wq(void)
146 {
147 destroy_workqueue(laundry_wq);
148 }
149
is_session_dead(struct nfsd4_session * ses)150 static bool is_session_dead(struct nfsd4_session *ses)
151 {
152 return ses->se_dead;
153 }
154
mark_session_dead_locked(struct nfsd4_session * ses,int ref_held_by_me)155 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
156 {
157 if (atomic_read(&ses->se_ref) > ref_held_by_me)
158 return nfserr_jukebox;
159 ses->se_dead = true;
160 return nfs_ok;
161 }
162
is_client_expired(struct nfs4_client * clp)163 static bool is_client_expired(struct nfs4_client *clp)
164 {
165 return clp->cl_time == 0;
166 }
167
nfsd4_dec_courtesy_client_count(struct nfsd_net * nn,struct nfs4_client * clp)168 static void nfsd4_dec_courtesy_client_count(struct nfsd_net *nn,
169 struct nfs4_client *clp)
170 {
171 if (clp->cl_state != NFSD4_ACTIVE)
172 atomic_add_unless(&nn->nfsd_courtesy_clients, -1, 0);
173 }
174
get_client_locked(struct nfs4_client * clp)175 static __be32 get_client_locked(struct nfs4_client *clp)
176 {
177 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
178
179 lockdep_assert_held(&nn->client_lock);
180
181 if (is_client_expired(clp))
182 return nfserr_expired;
183 atomic_inc(&clp->cl_rpc_users);
184 nfsd4_dec_courtesy_client_count(nn, clp);
185 clp->cl_state = NFSD4_ACTIVE;
186 return nfs_ok;
187 }
188
189 /* must be called under the client_lock */
190 static inline void
renew_client_locked(struct nfs4_client * clp)191 renew_client_locked(struct nfs4_client *clp)
192 {
193 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
194
195 if (is_client_expired(clp)) {
196 WARN_ON(1);
197 printk("%s: client (clientid %08x/%08x) already expired\n",
198 __func__,
199 clp->cl_clientid.cl_boot,
200 clp->cl_clientid.cl_id);
201 return;
202 }
203
204 list_move_tail(&clp->cl_lru, &nn->client_lru);
205 clp->cl_time = ktime_get_boottime_seconds();
206 nfsd4_dec_courtesy_client_count(nn, clp);
207 clp->cl_state = NFSD4_ACTIVE;
208 }
209
put_client_renew_locked(struct nfs4_client * clp)210 static void put_client_renew_locked(struct nfs4_client *clp)
211 {
212 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
213
214 lockdep_assert_held(&nn->client_lock);
215
216 if (!atomic_dec_and_test(&clp->cl_rpc_users))
217 return;
218 if (!is_client_expired(clp))
219 renew_client_locked(clp);
220 else
221 wake_up_all(&expiry_wq);
222 }
223
put_client_renew(struct nfs4_client * clp)224 static void put_client_renew(struct nfs4_client *clp)
225 {
226 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
227
228 if (!atomic_dec_and_lock(&clp->cl_rpc_users, &nn->client_lock))
229 return;
230 if (!is_client_expired(clp))
231 renew_client_locked(clp);
232 else
233 wake_up_all(&expiry_wq);
234 spin_unlock(&nn->client_lock);
235 }
236
nfsd4_get_session_locked(struct nfsd4_session * ses)237 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
238 {
239 __be32 status;
240
241 if (is_session_dead(ses))
242 return nfserr_badsession;
243 status = get_client_locked(ses->se_client);
244 if (status)
245 return status;
246 atomic_inc(&ses->se_ref);
247 return nfs_ok;
248 }
249
nfsd4_put_session_locked(struct nfsd4_session * ses)250 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
251 {
252 struct nfs4_client *clp = ses->se_client;
253 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
254
255 lockdep_assert_held(&nn->client_lock);
256
257 if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
258 free_session(ses);
259 put_client_renew_locked(clp);
260 }
261
nfsd4_put_session(struct nfsd4_session * ses)262 static void nfsd4_put_session(struct nfsd4_session *ses)
263 {
264 struct nfs4_client *clp = ses->se_client;
265 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
266
267 spin_lock(&nn->client_lock);
268 nfsd4_put_session_locked(ses);
269 spin_unlock(&nn->client_lock);
270 }
271
272 static struct nfsd4_blocked_lock *
find_blocked_lock(struct nfs4_lockowner * lo,struct knfsd_fh * fh,struct nfsd_net * nn)273 find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
274 struct nfsd_net *nn)
275 {
276 struct nfsd4_blocked_lock *cur, *found = NULL;
277
278 spin_lock(&nn->blocked_locks_lock);
279 list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
280 if (fh_match(fh, &cur->nbl_fh)) {
281 list_del_init(&cur->nbl_list);
282 WARN_ON(list_empty(&cur->nbl_lru));
283 list_del_init(&cur->nbl_lru);
284 found = cur;
285 break;
286 }
287 }
288 spin_unlock(&nn->blocked_locks_lock);
289 if (found)
290 locks_delete_block(&found->nbl_lock);
291 return found;
292 }
293
294 static struct nfsd4_blocked_lock *
find_or_allocate_block(struct nfs4_lockowner * lo,struct knfsd_fh * fh,struct nfsd_net * nn)295 find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
296 struct nfsd_net *nn)
297 {
298 struct nfsd4_blocked_lock *nbl;
299
300 nbl = find_blocked_lock(lo, fh, nn);
301 if (!nbl) {
302 nbl = kmalloc(sizeof(*nbl), GFP_KERNEL);
303 if (nbl) {
304 INIT_LIST_HEAD(&nbl->nbl_list);
305 INIT_LIST_HEAD(&nbl->nbl_lru);
306 fh_copy_shallow(&nbl->nbl_fh, fh);
307 locks_init_lock(&nbl->nbl_lock);
308 kref_init(&nbl->nbl_kref);
309 nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client,
310 &nfsd4_cb_notify_lock_ops,
311 NFSPROC4_CLNT_CB_NOTIFY_LOCK);
312 }
313 }
314 return nbl;
315 }
316
317 static void
free_nbl(struct kref * kref)318 free_nbl(struct kref *kref)
319 {
320 struct nfsd4_blocked_lock *nbl;
321
322 nbl = container_of(kref, struct nfsd4_blocked_lock, nbl_kref);
323 locks_release_private(&nbl->nbl_lock);
324 kfree(nbl);
325 }
326
327 static void
free_blocked_lock(struct nfsd4_blocked_lock * nbl)328 free_blocked_lock(struct nfsd4_blocked_lock *nbl)
329 {
330 locks_delete_block(&nbl->nbl_lock);
331 kref_put(&nbl->nbl_kref, free_nbl);
332 }
333
334 static void
remove_blocked_locks(struct nfs4_lockowner * lo)335 remove_blocked_locks(struct nfs4_lockowner *lo)
336 {
337 struct nfs4_client *clp = lo->lo_owner.so_client;
338 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
339 struct nfsd4_blocked_lock *nbl;
340 LIST_HEAD(reaplist);
341
342 /* Dequeue all blocked locks */
343 spin_lock(&nn->blocked_locks_lock);
344 while (!list_empty(&lo->lo_blocked)) {
345 nbl = list_first_entry(&lo->lo_blocked,
346 struct nfsd4_blocked_lock,
347 nbl_list);
348 list_del_init(&nbl->nbl_list);
349 WARN_ON(list_empty(&nbl->nbl_lru));
350 list_move(&nbl->nbl_lru, &reaplist);
351 }
352 spin_unlock(&nn->blocked_locks_lock);
353
354 /* Now free them */
355 while (!list_empty(&reaplist)) {
356 nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock,
357 nbl_lru);
358 list_del_init(&nbl->nbl_lru);
359 free_blocked_lock(nbl);
360 }
361 }
362
363 static void
nfsd4_cb_notify_lock_prepare(struct nfsd4_callback * cb)364 nfsd4_cb_notify_lock_prepare(struct nfsd4_callback *cb)
365 {
366 struct nfsd4_blocked_lock *nbl = container_of(cb,
367 struct nfsd4_blocked_lock, nbl_cb);
368 locks_delete_block(&nbl->nbl_lock);
369 }
370
371 static int
nfsd4_cb_notify_lock_done(struct nfsd4_callback * cb,struct rpc_task * task)372 nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task)
373 {
374 trace_nfsd_cb_notify_lock_done(&zero_stateid, task);
375
376 /*
377 * Since this is just an optimization, we don't try very hard if it
378 * turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
379 * just quit trying on anything else.
380 */
381 switch (task->tk_status) {
382 case -NFS4ERR_DELAY:
383 rpc_delay(task, 1 * HZ);
384 return 0;
385 default:
386 return 1;
387 }
388 }
389
390 static void
nfsd4_cb_notify_lock_release(struct nfsd4_callback * cb)391 nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)
392 {
393 struct nfsd4_blocked_lock *nbl = container_of(cb,
394 struct nfsd4_blocked_lock, nbl_cb);
395
396 free_blocked_lock(nbl);
397 }
398
399 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {
400 .prepare = nfsd4_cb_notify_lock_prepare,
401 .done = nfsd4_cb_notify_lock_done,
402 .release = nfsd4_cb_notify_lock_release,
403 .opcode = OP_CB_NOTIFY_LOCK,
404 };
405
406 /*
407 * We store the NONE, READ, WRITE, and BOTH bits separately in the
408 * st_{access,deny}_bmap field of the stateid, in order to track not
409 * only what share bits are currently in force, but also what
410 * combinations of share bits previous opens have used. This allows us
411 * to enforce the recommendation in
412 * https://datatracker.ietf.org/doc/html/rfc7530#section-16.19.4 that
413 * the server return an error if the client attempt to downgrade to a
414 * combination of share bits not explicable by closing some of its
415 * previous opens.
416 *
417 * This enforcement is arguably incomplete, since we don't keep
418 * track of access/deny bit combinations; so, e.g., we allow:
419 *
420 * OPEN allow read, deny write
421 * OPEN allow both, deny none
422 * DOWNGRADE allow read, deny none
423 *
424 * which we should reject.
425 *
426 * But you could also argue that our current code is already overkill,
427 * since it only exists to return NFS4ERR_INVAL on incorrect client
428 * behavior.
429 */
430 static unsigned int
bmap_to_share_mode(unsigned long bmap)431 bmap_to_share_mode(unsigned long bmap)
432 {
433 int i;
434 unsigned int access = 0;
435
436 for (i = 1; i < 4; i++) {
437 if (test_bit(i, &bmap))
438 access |= i;
439 }
440 return access;
441 }
442
443 /* set share access for a given stateid */
444 static inline void
set_access(u32 access,struct nfs4_ol_stateid * stp)445 set_access(u32 access, struct nfs4_ol_stateid *stp)
446 {
447 unsigned char mask = 1 << access;
448
449 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
450 stp->st_access_bmap |= mask;
451 }
452
453 /* clear share access for a given stateid */
454 static inline void
clear_access(u32 access,struct nfs4_ol_stateid * stp)455 clear_access(u32 access, struct nfs4_ol_stateid *stp)
456 {
457 unsigned char mask = 1 << access;
458
459 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
460 stp->st_access_bmap &= ~mask;
461 }
462
463 /* test whether a given stateid has access */
464 static inline bool
test_access(u32 access,struct nfs4_ol_stateid * stp)465 test_access(u32 access, struct nfs4_ol_stateid *stp)
466 {
467 unsigned char mask = 1 << access;
468
469 return (bool)(stp->st_access_bmap & mask);
470 }
471
472 /* set share deny for a given stateid */
473 static inline void
set_deny(u32 deny,struct nfs4_ol_stateid * stp)474 set_deny(u32 deny, struct nfs4_ol_stateid *stp)
475 {
476 unsigned char mask = 1 << deny;
477
478 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
479 stp->st_deny_bmap |= mask;
480 }
481
482 /* clear share deny for a given stateid */
483 static inline void
clear_deny(u32 deny,struct nfs4_ol_stateid * stp)484 clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
485 {
486 unsigned char mask = 1 << deny;
487
488 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
489 stp->st_deny_bmap &= ~mask;
490 }
491
492 /* test whether a given stateid is denying specific access */
493 static inline bool
test_deny(u32 deny,struct nfs4_ol_stateid * stp)494 test_deny(u32 deny, struct nfs4_ol_stateid *stp)
495 {
496 unsigned char mask = 1 << deny;
497
498 return (bool)(stp->st_deny_bmap & mask);
499 }
500
nfs4_access_to_omode(u32 access)501 static int nfs4_access_to_omode(u32 access)
502 {
503 switch (access & NFS4_SHARE_ACCESS_BOTH) {
504 case NFS4_SHARE_ACCESS_READ:
505 return O_RDONLY;
506 case NFS4_SHARE_ACCESS_WRITE:
507 return O_WRONLY;
508 case NFS4_SHARE_ACCESS_BOTH:
509 return O_RDWR;
510 }
511 WARN_ON_ONCE(1);
512 return O_RDONLY;
513 }
514
515 static inline int
access_permit_read(struct nfs4_ol_stateid * stp)516 access_permit_read(struct nfs4_ol_stateid *stp)
517 {
518 return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
519 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
520 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
521 }
522
523 static inline int
access_permit_write(struct nfs4_ol_stateid * stp)524 access_permit_write(struct nfs4_ol_stateid *stp)
525 {
526 return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
527 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
528 }
529
530 static inline struct nfs4_stateowner *
nfs4_get_stateowner(struct nfs4_stateowner * sop)531 nfs4_get_stateowner(struct nfs4_stateowner *sop)
532 {
533 atomic_inc(&sop->so_count);
534 return sop;
535 }
536
537 static int
same_owner_str(struct nfs4_stateowner * sop,struct xdr_netobj * owner)538 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
539 {
540 return (sop->so_owner.len == owner->len) &&
541 0 == memcmp(sop->so_owner.data, owner->data, owner->len);
542 }
543
544 static struct nfs4_openowner *
find_openstateowner_str(unsigned int hashval,struct nfsd4_open * open,struct nfs4_client * clp)545 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
546 struct nfs4_client *clp)
547 {
548 struct nfs4_stateowner *so;
549
550 lockdep_assert_held(&clp->cl_lock);
551
552 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
553 so_strhash) {
554 if (!so->so_is_open_owner)
555 continue;
556 if (same_owner_str(so, &open->op_owner))
557 return openowner(nfs4_get_stateowner(so));
558 }
559 return NULL;
560 }
561
562 static inline u32
opaque_hashval(const void * ptr,int nbytes)563 opaque_hashval(const void *ptr, int nbytes)
564 {
565 unsigned char *cptr = (unsigned char *) ptr;
566
567 u32 x = 0;
568 while (nbytes--) {
569 x *= 37;
570 x += *cptr++;
571 }
572 return x;
573 }
574
575 void
put_nfs4_file(struct nfs4_file * fi)576 put_nfs4_file(struct nfs4_file *fi)
577 {
578 if (refcount_dec_and_test(&fi->fi_ref)) {
579 nfsd4_file_hash_remove(fi);
580 WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
581 WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
582 kfree_rcu(fi, fi_rcu);
583 }
584 }
585
586 static struct nfsd_file *
find_writeable_file_locked(struct nfs4_file * f)587 find_writeable_file_locked(struct nfs4_file *f)
588 {
589 struct nfsd_file *ret;
590
591 lockdep_assert_held(&f->fi_lock);
592
593 ret = nfsd_file_get(f->fi_fds[O_WRONLY]);
594 if (!ret)
595 ret = nfsd_file_get(f->fi_fds[O_RDWR]);
596 return ret;
597 }
598
599 static struct nfsd_file *
find_writeable_file(struct nfs4_file * f)600 find_writeable_file(struct nfs4_file *f)
601 {
602 struct nfsd_file *ret;
603
604 spin_lock(&f->fi_lock);
605 ret = find_writeable_file_locked(f);
606 spin_unlock(&f->fi_lock);
607
608 return ret;
609 }
610
611 static struct nfsd_file *
find_readable_file_locked(struct nfs4_file * f)612 find_readable_file_locked(struct nfs4_file *f)
613 {
614 struct nfsd_file *ret;
615
616 lockdep_assert_held(&f->fi_lock);
617
618 ret = nfsd_file_get(f->fi_fds[O_RDONLY]);
619 if (!ret)
620 ret = nfsd_file_get(f->fi_fds[O_RDWR]);
621 return ret;
622 }
623
624 static struct nfsd_file *
find_readable_file(struct nfs4_file * f)625 find_readable_file(struct nfs4_file *f)
626 {
627 struct nfsd_file *ret;
628
629 spin_lock(&f->fi_lock);
630 ret = find_readable_file_locked(f);
631 spin_unlock(&f->fi_lock);
632
633 return ret;
634 }
635
636 static struct nfsd_file *
find_rw_file(struct nfs4_file * f)637 find_rw_file(struct nfs4_file *f)
638 {
639 struct nfsd_file *ret;
640
641 spin_lock(&f->fi_lock);
642 ret = nfsd_file_get(f->fi_fds[O_RDWR]);
643 spin_unlock(&f->fi_lock);
644
645 return ret;
646 }
647
648 struct nfsd_file *
find_any_file(struct nfs4_file * f)649 find_any_file(struct nfs4_file *f)
650 {
651 struct nfsd_file *ret;
652
653 if (!f)
654 return NULL;
655 spin_lock(&f->fi_lock);
656 ret = nfsd_file_get(f->fi_fds[O_RDWR]);
657 if (!ret) {
658 ret = nfsd_file_get(f->fi_fds[O_WRONLY]);
659 if (!ret)
660 ret = nfsd_file_get(f->fi_fds[O_RDONLY]);
661 }
662 spin_unlock(&f->fi_lock);
663 return ret;
664 }
665
find_any_file_locked(struct nfs4_file * f)666 static struct nfsd_file *find_any_file_locked(struct nfs4_file *f)
667 {
668 lockdep_assert_held(&f->fi_lock);
669
670 if (f->fi_fds[O_RDWR])
671 return f->fi_fds[O_RDWR];
672 if (f->fi_fds[O_WRONLY])
673 return f->fi_fds[O_WRONLY];
674 if (f->fi_fds[O_RDONLY])
675 return f->fi_fds[O_RDONLY];
676 return NULL;
677 }
678
679 static atomic_long_t num_delegations;
680 unsigned long max_delegations;
681
682 /*
683 * Open owner state (share locks)
684 */
685
686 /* hash tables for lock and open owners */
687 #define OWNER_HASH_BITS 8
688 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
689 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
690
ownerstr_hashval(struct xdr_netobj * ownername)691 static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
692 {
693 unsigned int ret;
694
695 ret = opaque_hashval(ownername->data, ownername->len);
696 return ret & OWNER_HASH_MASK;
697 }
698
699 static struct rhltable nfs4_file_rhltable ____cacheline_aligned_in_smp;
700
701 static const struct rhashtable_params nfs4_file_rhash_params = {
702 .key_len = sizeof_field(struct nfs4_file, fi_inode),
703 .key_offset = offsetof(struct nfs4_file, fi_inode),
704 .head_offset = offsetof(struct nfs4_file, fi_rlist),
705
706 /*
707 * Start with a single page hash table to reduce resizing churn
708 * on light workloads.
709 */
710 .min_size = 256,
711 .automatic_shrinking = true,
712 };
713
714 /*
715 * Check if courtesy clients have conflicting access and resolve it if possible
716 *
717 * access: is op_share_access if share_access is true.
718 * Check if access mode, op_share_access, would conflict with
719 * the current deny mode of the file 'fp'.
720 * access: is op_share_deny if share_access is false.
721 * Check if the deny mode, op_share_deny, would conflict with
722 * current access of the file 'fp'.
723 * stp: skip checking this entry.
724 * new_stp: normal open, not open upgrade.
725 *
726 * Function returns:
727 * false - access/deny mode conflict with normal client.
728 * true - no conflict or conflict with courtesy client(s) is resolved.
729 */
730 static bool
nfs4_resolve_deny_conflicts_locked(struct nfs4_file * fp,bool new_stp,struct nfs4_ol_stateid * stp,u32 access,bool share_access)731 nfs4_resolve_deny_conflicts_locked(struct nfs4_file *fp, bool new_stp,
732 struct nfs4_ol_stateid *stp, u32 access, bool share_access)
733 {
734 struct nfs4_ol_stateid *st;
735 bool resolvable = true;
736 unsigned char bmap;
737 struct nfsd_net *nn;
738 struct nfs4_client *clp;
739
740 lockdep_assert_held(&fp->fi_lock);
741 list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
742 /* ignore lock stateid */
743 if (st->st_openstp)
744 continue;
745 if (st == stp && new_stp)
746 continue;
747 /* check file access against deny mode or vice versa */
748 bmap = share_access ? st->st_deny_bmap : st->st_access_bmap;
749 if (!(access & bmap_to_share_mode(bmap)))
750 continue;
751 clp = st->st_stid.sc_client;
752 if (try_to_expire_client(clp))
753 continue;
754 resolvable = false;
755 break;
756 }
757 if (resolvable) {
758 clp = stp->st_stid.sc_client;
759 nn = net_generic(clp->net, nfsd_net_id);
760 mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
761 }
762 return resolvable;
763 }
764
765 static void
__nfs4_file_get_access(struct nfs4_file * fp,u32 access)766 __nfs4_file_get_access(struct nfs4_file *fp, u32 access)
767 {
768 lockdep_assert_held(&fp->fi_lock);
769
770 if (access & NFS4_SHARE_ACCESS_WRITE)
771 atomic_inc(&fp->fi_access[O_WRONLY]);
772 if (access & NFS4_SHARE_ACCESS_READ)
773 atomic_inc(&fp->fi_access[O_RDONLY]);
774 }
775
776 static __be32
nfs4_file_get_access(struct nfs4_file * fp,u32 access)777 nfs4_file_get_access(struct nfs4_file *fp, u32 access)
778 {
779 lockdep_assert_held(&fp->fi_lock);
780
781 /* Does this access mode make sense? */
782 if (access & ~NFS4_SHARE_ACCESS_BOTH)
783 return nfserr_inval;
784
785 /* Does it conflict with a deny mode already set? */
786 if ((access & fp->fi_share_deny) != 0)
787 return nfserr_share_denied;
788
789 __nfs4_file_get_access(fp, access);
790 return nfs_ok;
791 }
792
nfs4_file_check_deny(struct nfs4_file * fp,u32 deny)793 static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
794 {
795 /* Common case is that there is no deny mode. */
796 if (deny) {
797 /* Does this deny mode make sense? */
798 if (deny & ~NFS4_SHARE_DENY_BOTH)
799 return nfserr_inval;
800
801 if ((deny & NFS4_SHARE_DENY_READ) &&
802 atomic_read(&fp->fi_access[O_RDONLY]))
803 return nfserr_share_denied;
804
805 if ((deny & NFS4_SHARE_DENY_WRITE) &&
806 atomic_read(&fp->fi_access[O_WRONLY]))
807 return nfserr_share_denied;
808 }
809 return nfs_ok;
810 }
811
__nfs4_file_put_access(struct nfs4_file * fp,int oflag)812 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
813 {
814 might_lock(&fp->fi_lock);
815
816 if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
817 struct nfsd_file *f1 = NULL;
818 struct nfsd_file *f2 = NULL;
819
820 swap(f1, fp->fi_fds[oflag]);
821 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
822 swap(f2, fp->fi_fds[O_RDWR]);
823 spin_unlock(&fp->fi_lock);
824 if (f1)
825 nfsd_file_put(f1);
826 if (f2)
827 nfsd_file_put(f2);
828 }
829 }
830
nfs4_file_put_access(struct nfs4_file * fp,u32 access)831 static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
832 {
833 WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
834
835 if (access & NFS4_SHARE_ACCESS_WRITE)
836 __nfs4_file_put_access(fp, O_WRONLY);
837 if (access & NFS4_SHARE_ACCESS_READ)
838 __nfs4_file_put_access(fp, O_RDONLY);
839 }
840
841 /*
842 * Allocate a new open/delegation state counter. This is needed for
843 * pNFS for proper return on close semantics.
844 *
845 * Note that we only allocate it for pNFS-enabled exports, otherwise
846 * all pointers to struct nfs4_clnt_odstate are always NULL.
847 */
848 static struct nfs4_clnt_odstate *
alloc_clnt_odstate(struct nfs4_client * clp)849 alloc_clnt_odstate(struct nfs4_client *clp)
850 {
851 struct nfs4_clnt_odstate *co;
852
853 co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
854 if (co) {
855 co->co_client = clp;
856 refcount_set(&co->co_odcount, 1);
857 }
858 return co;
859 }
860
861 static void
hash_clnt_odstate_locked(struct nfs4_clnt_odstate * co)862 hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
863 {
864 struct nfs4_file *fp = co->co_file;
865
866 lockdep_assert_held(&fp->fi_lock);
867 list_add(&co->co_perfile, &fp->fi_clnt_odstate);
868 }
869
870 static inline void
get_clnt_odstate(struct nfs4_clnt_odstate * co)871 get_clnt_odstate(struct nfs4_clnt_odstate *co)
872 {
873 if (co)
874 refcount_inc(&co->co_odcount);
875 }
876
877 static void
put_clnt_odstate(struct nfs4_clnt_odstate * co)878 put_clnt_odstate(struct nfs4_clnt_odstate *co)
879 {
880 struct nfs4_file *fp;
881
882 if (!co)
883 return;
884
885 fp = co->co_file;
886 if (refcount_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
887 list_del(&co->co_perfile);
888 spin_unlock(&fp->fi_lock);
889
890 nfsd4_return_all_file_layouts(co->co_client, fp);
891 kmem_cache_free(odstate_slab, co);
892 }
893 }
894
895 static struct nfs4_clnt_odstate *
find_or_hash_clnt_odstate(struct nfs4_file * fp,struct nfs4_clnt_odstate * new)896 find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
897 {
898 struct nfs4_clnt_odstate *co;
899 struct nfs4_client *cl;
900
901 if (!new)
902 return NULL;
903
904 cl = new->co_client;
905
906 spin_lock(&fp->fi_lock);
907 list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
908 if (co->co_client == cl) {
909 get_clnt_odstate(co);
910 goto out;
911 }
912 }
913 co = new;
914 co->co_file = fp;
915 hash_clnt_odstate_locked(new);
916 out:
917 spin_unlock(&fp->fi_lock);
918 return co;
919 }
920
nfs4_alloc_stid(struct nfs4_client * cl,struct kmem_cache * slab,void (* sc_free)(struct nfs4_stid *))921 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
922 void (*sc_free)(struct nfs4_stid *))
923 {
924 struct nfs4_stid *stid;
925 int new_id;
926
927 stid = kmem_cache_zalloc(slab, GFP_KERNEL);
928 if (!stid)
929 return NULL;
930
931 idr_preload(GFP_KERNEL);
932 spin_lock(&cl->cl_lock);
933 /* Reserving 0 for start of file in nfsdfs "states" file: */
934 new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 1, 0, GFP_NOWAIT);
935 spin_unlock(&cl->cl_lock);
936 idr_preload_end();
937 if (new_id < 0)
938 goto out_free;
939
940 stid->sc_free = sc_free;
941 stid->sc_client = cl;
942 stid->sc_stateid.si_opaque.so_id = new_id;
943 stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
944 /* Will be incremented before return to client: */
945 refcount_set(&stid->sc_count, 1);
946 spin_lock_init(&stid->sc_lock);
947 INIT_LIST_HEAD(&stid->sc_cp_list);
948
949 /*
950 * It shouldn't be a problem to reuse an opaque stateid value.
951 * I don't think it is for 4.1. But with 4.0 I worry that, for
952 * example, a stray write retransmission could be accepted by
953 * the server when it should have been rejected. Therefore,
954 * adopt a trick from the sctp code to attempt to maximize the
955 * amount of time until an id is reused, by ensuring they always
956 * "increase" (mod INT_MAX):
957 */
958 return stid;
959 out_free:
960 kmem_cache_free(slab, stid);
961 return NULL;
962 }
963
964 /*
965 * Create a unique stateid_t to represent each COPY.
966 */
nfs4_init_cp_state(struct nfsd_net * nn,copy_stateid_t * stid,unsigned char cs_type)967 static int nfs4_init_cp_state(struct nfsd_net *nn, copy_stateid_t *stid,
968 unsigned char cs_type)
969 {
970 int new_id;
971
972 stid->cs_stid.si_opaque.so_clid.cl_boot = (u32)nn->boot_time;
973 stid->cs_stid.si_opaque.so_clid.cl_id = nn->s2s_cp_cl_id;
974
975 idr_preload(GFP_KERNEL);
976 spin_lock(&nn->s2s_cp_lock);
977 new_id = idr_alloc_cyclic(&nn->s2s_cp_stateids, stid, 0, 0, GFP_NOWAIT);
978 stid->cs_stid.si_opaque.so_id = new_id;
979 stid->cs_stid.si_generation = 1;
980 spin_unlock(&nn->s2s_cp_lock);
981 idr_preload_end();
982 if (new_id < 0)
983 return 0;
984 stid->cs_type = cs_type;
985 return 1;
986 }
987
nfs4_init_copy_state(struct nfsd_net * nn,struct nfsd4_copy * copy)988 int nfs4_init_copy_state(struct nfsd_net *nn, struct nfsd4_copy *copy)
989 {
990 return nfs4_init_cp_state(nn, ©->cp_stateid, NFS4_COPY_STID);
991 }
992
nfs4_alloc_init_cpntf_state(struct nfsd_net * nn,struct nfs4_stid * p_stid)993 struct nfs4_cpntf_state *nfs4_alloc_init_cpntf_state(struct nfsd_net *nn,
994 struct nfs4_stid *p_stid)
995 {
996 struct nfs4_cpntf_state *cps;
997
998 cps = kzalloc(sizeof(struct nfs4_cpntf_state), GFP_KERNEL);
999 if (!cps)
1000 return NULL;
1001 cps->cpntf_time = ktime_get_boottime_seconds();
1002 refcount_set(&cps->cp_stateid.cs_count, 1);
1003 if (!nfs4_init_cp_state(nn, &cps->cp_stateid, NFS4_COPYNOTIFY_STID))
1004 goto out_free;
1005 spin_lock(&nn->s2s_cp_lock);
1006 list_add(&cps->cp_list, &p_stid->sc_cp_list);
1007 spin_unlock(&nn->s2s_cp_lock);
1008 return cps;
1009 out_free:
1010 kfree(cps);
1011 return NULL;
1012 }
1013
nfs4_free_copy_state(struct nfsd4_copy * copy)1014 void nfs4_free_copy_state(struct nfsd4_copy *copy)
1015 {
1016 struct nfsd_net *nn;
1017
1018 if (copy->cp_stateid.cs_type != NFS4_COPY_STID)
1019 return;
1020 nn = net_generic(copy->cp_clp->net, nfsd_net_id);
1021 spin_lock(&nn->s2s_cp_lock);
1022 idr_remove(&nn->s2s_cp_stateids,
1023 copy->cp_stateid.cs_stid.si_opaque.so_id);
1024 spin_unlock(&nn->s2s_cp_lock);
1025 }
1026
nfs4_free_cpntf_statelist(struct net * net,struct nfs4_stid * stid)1027 static void nfs4_free_cpntf_statelist(struct net *net, struct nfs4_stid *stid)
1028 {
1029 struct nfs4_cpntf_state *cps;
1030 struct nfsd_net *nn;
1031
1032 nn = net_generic(net, nfsd_net_id);
1033 spin_lock(&nn->s2s_cp_lock);
1034 while (!list_empty(&stid->sc_cp_list)) {
1035 cps = list_first_entry(&stid->sc_cp_list,
1036 struct nfs4_cpntf_state, cp_list);
1037 _free_cpntf_state_locked(nn, cps);
1038 }
1039 spin_unlock(&nn->s2s_cp_lock);
1040 }
1041
nfs4_alloc_open_stateid(struct nfs4_client * clp)1042 static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
1043 {
1044 struct nfs4_stid *stid;
1045
1046 stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid);
1047 if (!stid)
1048 return NULL;
1049
1050 return openlockstateid(stid);
1051 }
1052
nfs4_free_deleg(struct nfs4_stid * stid)1053 static void nfs4_free_deleg(struct nfs4_stid *stid)
1054 {
1055 struct nfs4_delegation *dp = delegstateid(stid);
1056
1057 WARN_ON_ONCE(!list_empty(&stid->sc_cp_list));
1058 WARN_ON_ONCE(!list_empty(&dp->dl_perfile));
1059 WARN_ON_ONCE(!list_empty(&dp->dl_perclnt));
1060 WARN_ON_ONCE(!list_empty(&dp->dl_recall_lru));
1061 kmem_cache_free(deleg_slab, stid);
1062 atomic_long_dec(&num_delegations);
1063 }
1064
1065 /*
1066 * When we recall a delegation, we should be careful not to hand it
1067 * out again straight away.
1068 * To ensure this we keep a pair of bloom filters ('new' and 'old')
1069 * in which the filehandles of recalled delegations are "stored".
1070 * If a filehandle appear in either filter, a delegation is blocked.
1071 * When a delegation is recalled, the filehandle is stored in the "new"
1072 * filter.
1073 * Every 30 seconds we swap the filters and clear the "new" one,
1074 * unless both are empty of course. This results in delegations for a
1075 * given filehandle being blocked for between 30 and 60 seconds.
1076 *
1077 * Each filter is 256 bits. We hash the filehandle to 32bit and use the
1078 * low 3 bytes as hash-table indices.
1079 *
1080 * 'blocked_delegations_lock', which is always taken in block_delegations(),
1081 * is used to manage concurrent access. Testing does not need the lock
1082 * except when swapping the two filters.
1083 */
1084 static DEFINE_SPINLOCK(blocked_delegations_lock);
1085 static struct bloom_pair {
1086 int entries, old_entries;
1087 time64_t swap_time;
1088 int new; /* index into 'set' */
1089 DECLARE_BITMAP(set[2], 256);
1090 } blocked_delegations;
1091
delegation_blocked(struct knfsd_fh * fh)1092 static int delegation_blocked(struct knfsd_fh *fh)
1093 {
1094 u32 hash;
1095 struct bloom_pair *bd = &blocked_delegations;
1096
1097 if (bd->entries == 0)
1098 return 0;
1099 if (ktime_get_seconds() - bd->swap_time > 30) {
1100 spin_lock(&blocked_delegations_lock);
1101 if (ktime_get_seconds() - bd->swap_time > 30) {
1102 bd->entries -= bd->old_entries;
1103 bd->old_entries = bd->entries;
1104 bd->new = 1-bd->new;
1105 memset(bd->set[bd->new], 0,
1106 sizeof(bd->set[0]));
1107 bd->swap_time = ktime_get_seconds();
1108 }
1109 spin_unlock(&blocked_delegations_lock);
1110 }
1111 hash = jhash(&fh->fh_raw, fh->fh_size, 0);
1112 if (test_bit(hash&255, bd->set[0]) &&
1113 test_bit((hash>>8)&255, bd->set[0]) &&
1114 test_bit((hash>>16)&255, bd->set[0]))
1115 return 1;
1116
1117 if (test_bit(hash&255, bd->set[1]) &&
1118 test_bit((hash>>8)&255, bd->set[1]) &&
1119 test_bit((hash>>16)&255, bd->set[1]))
1120 return 1;
1121
1122 return 0;
1123 }
1124
block_delegations(struct knfsd_fh * fh)1125 static void block_delegations(struct knfsd_fh *fh)
1126 {
1127 u32 hash;
1128 struct bloom_pair *bd = &blocked_delegations;
1129
1130 hash = jhash(&fh->fh_raw, fh->fh_size, 0);
1131
1132 spin_lock(&blocked_delegations_lock);
1133 __set_bit(hash&255, bd->set[bd->new]);
1134 __set_bit((hash>>8)&255, bd->set[bd->new]);
1135 __set_bit((hash>>16)&255, bd->set[bd->new]);
1136 if (bd->entries == 0)
1137 bd->swap_time = ktime_get_seconds();
1138 bd->entries += 1;
1139 spin_unlock(&blocked_delegations_lock);
1140 }
1141
1142 static struct nfs4_delegation *
alloc_init_deleg(struct nfs4_client * clp,struct nfs4_file * fp,struct nfs4_clnt_odstate * odstate,u32 dl_type)1143 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp,
1144 struct nfs4_clnt_odstate *odstate, u32 dl_type)
1145 {
1146 struct nfs4_delegation *dp;
1147 struct nfs4_stid *stid;
1148 long n;
1149
1150 dprintk("NFSD alloc_init_deleg\n");
1151 n = atomic_long_inc_return(&num_delegations);
1152 if (n < 0 || n > max_delegations)
1153 goto out_dec;
1154 if (delegation_blocked(&fp->fi_fhandle))
1155 goto out_dec;
1156 stid = nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg);
1157 if (stid == NULL)
1158 goto out_dec;
1159 dp = delegstateid(stid);
1160
1161 /*
1162 * delegation seqid's are never incremented. The 4.1 special
1163 * meaning of seqid 0 isn't meaningful, really, but let's avoid
1164 * 0 anyway just for consistency and use 1:
1165 */
1166 dp->dl_stid.sc_stateid.si_generation = 1;
1167 INIT_LIST_HEAD(&dp->dl_perfile);
1168 INIT_LIST_HEAD(&dp->dl_perclnt);
1169 INIT_LIST_HEAD(&dp->dl_recall_lru);
1170 dp->dl_clnt_odstate = odstate;
1171 get_clnt_odstate(odstate);
1172 dp->dl_type = dl_type;
1173 dp->dl_retries = 1;
1174 dp->dl_recalled = false;
1175 nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
1176 &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
1177 nfsd4_init_cb(&dp->dl_cb_fattr.ncf_getattr, dp->dl_stid.sc_client,
1178 &nfsd4_cb_getattr_ops, NFSPROC4_CLNT_CB_GETATTR);
1179 dp->dl_cb_fattr.ncf_file_modified = false;
1180 get_nfs4_file(fp);
1181 dp->dl_stid.sc_file = fp;
1182 return dp;
1183 out_dec:
1184 atomic_long_dec(&num_delegations);
1185 return NULL;
1186 }
1187
1188 void
nfs4_put_stid(struct nfs4_stid * s)1189 nfs4_put_stid(struct nfs4_stid *s)
1190 {
1191 struct nfs4_file *fp = s->sc_file;
1192 struct nfs4_client *clp = s->sc_client;
1193
1194 might_lock(&clp->cl_lock);
1195
1196 if (!refcount_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
1197 wake_up_all(&close_wq);
1198 return;
1199 }
1200 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1201 if (s->sc_status & SC_STATUS_ADMIN_REVOKED)
1202 atomic_dec(&s->sc_client->cl_admin_revoked);
1203 nfs4_free_cpntf_statelist(clp->net, s);
1204 spin_unlock(&clp->cl_lock);
1205 s->sc_free(s);
1206 if (fp)
1207 put_nfs4_file(fp);
1208 }
1209
1210 void
nfs4_inc_and_copy_stateid(stateid_t * dst,struct nfs4_stid * stid)1211 nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
1212 {
1213 stateid_t *src = &stid->sc_stateid;
1214
1215 spin_lock(&stid->sc_lock);
1216 if (unlikely(++src->si_generation == 0))
1217 src->si_generation = 1;
1218 memcpy(dst, src, sizeof(*dst));
1219 spin_unlock(&stid->sc_lock);
1220 }
1221
put_deleg_file(struct nfs4_file * fp)1222 static void put_deleg_file(struct nfs4_file *fp)
1223 {
1224 struct nfsd_file *nf = NULL;
1225
1226 spin_lock(&fp->fi_lock);
1227 if (--fp->fi_delegees == 0)
1228 swap(nf, fp->fi_deleg_file);
1229 spin_unlock(&fp->fi_lock);
1230
1231 if (nf)
1232 nfsd_file_put(nf);
1233 }
1234
nfs4_unlock_deleg_lease(struct nfs4_delegation * dp)1235 static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp)
1236 {
1237 struct nfs4_file *fp = dp->dl_stid.sc_file;
1238 struct nfsd_file *nf = fp->fi_deleg_file;
1239
1240 WARN_ON_ONCE(!fp->fi_delegees);
1241
1242 kernel_setlease(nf->nf_file, F_UNLCK, NULL, (void **)&dp);
1243 put_deleg_file(fp);
1244 }
1245
destroy_unhashed_deleg(struct nfs4_delegation * dp)1246 static void destroy_unhashed_deleg(struct nfs4_delegation *dp)
1247 {
1248 put_clnt_odstate(dp->dl_clnt_odstate);
1249 nfs4_unlock_deleg_lease(dp);
1250 nfs4_put_stid(&dp->dl_stid);
1251 }
1252
1253 /**
1254 * nfs4_delegation_exists - Discover if this delegation already exists
1255 * @clp: a pointer to the nfs4_client we're granting a delegation to
1256 * @fp: a pointer to the nfs4_file we're granting a delegation on
1257 *
1258 * Return:
1259 * On success: true iff an existing delegation is found
1260 */
1261
1262 static bool
nfs4_delegation_exists(struct nfs4_client * clp,struct nfs4_file * fp)1263 nfs4_delegation_exists(struct nfs4_client *clp, struct nfs4_file *fp)
1264 {
1265 struct nfs4_delegation *searchdp = NULL;
1266 struct nfs4_client *searchclp = NULL;
1267
1268 lockdep_assert_held(&state_lock);
1269 lockdep_assert_held(&fp->fi_lock);
1270
1271 list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
1272 searchclp = searchdp->dl_stid.sc_client;
1273 if (clp == searchclp) {
1274 return true;
1275 }
1276 }
1277 return false;
1278 }
1279
1280 /**
1281 * hash_delegation_locked - Add a delegation to the appropriate lists
1282 * @dp: a pointer to the nfs4_delegation we are adding.
1283 * @fp: a pointer to the nfs4_file we're granting a delegation on
1284 *
1285 * Return:
1286 * On success: NULL if the delegation was successfully hashed.
1287 *
1288 * On error: -EAGAIN if one was previously granted to this
1289 * nfs4_client for this nfs4_file. Delegation is not hashed.
1290 *
1291 */
1292
1293 static int
hash_delegation_locked(struct nfs4_delegation * dp,struct nfs4_file * fp)1294 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
1295 {
1296 struct nfs4_client *clp = dp->dl_stid.sc_client;
1297
1298 lockdep_assert_held(&state_lock);
1299 lockdep_assert_held(&fp->fi_lock);
1300 lockdep_assert_held(&clp->cl_lock);
1301
1302 if (nfs4_delegation_exists(clp, fp))
1303 return -EAGAIN;
1304 refcount_inc(&dp->dl_stid.sc_count);
1305 dp->dl_stid.sc_type = SC_TYPE_DELEG;
1306 list_add(&dp->dl_perfile, &fp->fi_delegations);
1307 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1308 return 0;
1309 }
1310
delegation_hashed(struct nfs4_delegation * dp)1311 static bool delegation_hashed(struct nfs4_delegation *dp)
1312 {
1313 return !(list_empty(&dp->dl_perfile));
1314 }
1315
1316 static bool
unhash_delegation_locked(struct nfs4_delegation * dp,unsigned short statusmask)1317 unhash_delegation_locked(struct nfs4_delegation *dp, unsigned short statusmask)
1318 {
1319 struct nfs4_file *fp = dp->dl_stid.sc_file;
1320
1321 lockdep_assert_held(&state_lock);
1322
1323 if (!delegation_hashed(dp))
1324 return false;
1325
1326 if (statusmask == SC_STATUS_REVOKED &&
1327 dp->dl_stid.sc_client->cl_minorversion == 0)
1328 statusmask = SC_STATUS_CLOSED;
1329 dp->dl_stid.sc_status |= statusmask;
1330 if (statusmask & SC_STATUS_ADMIN_REVOKED)
1331 atomic_inc(&dp->dl_stid.sc_client->cl_admin_revoked);
1332
1333 /* Ensure that deleg break won't try to requeue it */
1334 ++dp->dl_time;
1335 spin_lock(&fp->fi_lock);
1336 list_del_init(&dp->dl_perclnt);
1337 list_del_init(&dp->dl_recall_lru);
1338 list_del_init(&dp->dl_perfile);
1339 spin_unlock(&fp->fi_lock);
1340 return true;
1341 }
1342
destroy_delegation(struct nfs4_delegation * dp)1343 static void destroy_delegation(struct nfs4_delegation *dp)
1344 {
1345 bool unhashed;
1346
1347 spin_lock(&state_lock);
1348 unhashed = unhash_delegation_locked(dp, SC_STATUS_CLOSED);
1349 spin_unlock(&state_lock);
1350 if (unhashed)
1351 destroy_unhashed_deleg(dp);
1352 }
1353
1354 /**
1355 * revoke_delegation - perform nfs4 delegation structure cleanup
1356 * @dp: pointer to the delegation
1357 *
1358 * This function assumes that it's called either from the administrative
1359 * interface (nfsd4_revoke_states()) that's revoking a specific delegation
1360 * stateid or it's called from a laundromat thread (nfsd4_landromat()) that
1361 * determined that this specific state has expired and needs to be revoked
1362 * (both mark state with the appropriate stid sc_status mode). It is also
1363 * assumed that a reference was taken on the @dp state.
1364 *
1365 * If this function finds that the @dp state is SC_STATUS_FREED it means
1366 * that a FREE_STATEID operation for this stateid has been processed and
1367 * we can proceed to removing it from recalled list. However, if @dp state
1368 * isn't marked SC_STATUS_FREED, it means we need place it on the cl_revoked
1369 * list and wait for the FREE_STATEID to arrive from the client. At the same
1370 * time, we need to mark it as SC_STATUS_FREEABLE to indicate to the
1371 * nfsd4_free_stateid() function that this stateid has already been added
1372 * to the cl_revoked list and that nfsd4_free_stateid() is now responsible
1373 * for removing it from the list. Inspection of where the delegation state
1374 * in the revocation process is protected by the clp->cl_lock.
1375 */
revoke_delegation(struct nfs4_delegation * dp)1376 static void revoke_delegation(struct nfs4_delegation *dp)
1377 {
1378 struct nfs4_client *clp = dp->dl_stid.sc_client;
1379
1380 WARN_ON(!list_empty(&dp->dl_recall_lru));
1381 WARN_ON_ONCE(!(dp->dl_stid.sc_status &
1382 (SC_STATUS_REVOKED | SC_STATUS_ADMIN_REVOKED)));
1383
1384 trace_nfsd_stid_revoke(&dp->dl_stid);
1385
1386 spin_lock(&clp->cl_lock);
1387 if (dp->dl_stid.sc_status & SC_STATUS_FREED) {
1388 list_del_init(&dp->dl_recall_lru);
1389 goto out;
1390 }
1391 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
1392 dp->dl_stid.sc_status |= SC_STATUS_FREEABLE;
1393 out:
1394 spin_unlock(&clp->cl_lock);
1395 destroy_unhashed_deleg(dp);
1396 }
1397
1398 /*
1399 * SETCLIENTID state
1400 */
1401
clientid_hashval(u32 id)1402 static unsigned int clientid_hashval(u32 id)
1403 {
1404 return id & CLIENT_HASH_MASK;
1405 }
1406
clientstr_hashval(struct xdr_netobj name)1407 static unsigned int clientstr_hashval(struct xdr_netobj name)
1408 {
1409 return opaque_hashval(name.data, 8) & CLIENT_HASH_MASK;
1410 }
1411
1412 /*
1413 * A stateid that had a deny mode associated with it is being released
1414 * or downgraded. Recalculate the deny mode on the file.
1415 */
1416 static void
recalculate_deny_mode(struct nfs4_file * fp)1417 recalculate_deny_mode(struct nfs4_file *fp)
1418 {
1419 struct nfs4_ol_stateid *stp;
1420 u32 old_deny;
1421
1422 spin_lock(&fp->fi_lock);
1423 old_deny = fp->fi_share_deny;
1424 fp->fi_share_deny = 0;
1425 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1426 fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
1427 if (fp->fi_share_deny == old_deny)
1428 break;
1429 }
1430 spin_unlock(&fp->fi_lock);
1431 }
1432
1433 static void
reset_union_bmap_deny(u32 deny,struct nfs4_ol_stateid * stp)1434 reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
1435 {
1436 int i;
1437 bool change = false;
1438
1439 for (i = 1; i < 4; i++) {
1440 if ((i & deny) != i) {
1441 change = true;
1442 clear_deny(i, stp);
1443 }
1444 }
1445
1446 /* Recalculate per-file deny mode if there was a change */
1447 if (change)
1448 recalculate_deny_mode(stp->st_stid.sc_file);
1449 }
1450
1451 /* release all access and file references for a given stateid */
1452 static void
release_all_access(struct nfs4_ol_stateid * stp)1453 release_all_access(struct nfs4_ol_stateid *stp)
1454 {
1455 int i;
1456 struct nfs4_file *fp = stp->st_stid.sc_file;
1457
1458 if (fp && stp->st_deny_bmap != 0)
1459 recalculate_deny_mode(fp);
1460
1461 for (i = 1; i < 4; i++) {
1462 if (test_access(i, stp))
1463 nfs4_file_put_access(stp->st_stid.sc_file, i);
1464 clear_access(i, stp);
1465 }
1466 }
1467
nfs4_free_stateowner(struct nfs4_stateowner * sop)1468 static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
1469 {
1470 kfree(sop->so_owner.data);
1471 sop->so_ops->so_free(sop);
1472 }
1473
nfs4_put_stateowner(struct nfs4_stateowner * sop)1474 static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
1475 {
1476 struct nfs4_client *clp = sop->so_client;
1477
1478 might_lock(&clp->cl_lock);
1479
1480 if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
1481 return;
1482 sop->so_ops->so_unhash(sop);
1483 spin_unlock(&clp->cl_lock);
1484 nfs4_free_stateowner(sop);
1485 }
1486
1487 static bool
nfs4_ol_stateid_unhashed(const struct nfs4_ol_stateid * stp)1488 nfs4_ol_stateid_unhashed(const struct nfs4_ol_stateid *stp)
1489 {
1490 return list_empty(&stp->st_perfile);
1491 }
1492
unhash_ol_stateid(struct nfs4_ol_stateid * stp)1493 static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
1494 {
1495 struct nfs4_file *fp = stp->st_stid.sc_file;
1496
1497 lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
1498
1499 if (list_empty(&stp->st_perfile))
1500 return false;
1501
1502 spin_lock(&fp->fi_lock);
1503 list_del_init(&stp->st_perfile);
1504 spin_unlock(&fp->fi_lock);
1505 list_del(&stp->st_perstateowner);
1506 return true;
1507 }
1508
nfs4_free_ol_stateid(struct nfs4_stid * stid)1509 static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
1510 {
1511 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1512
1513 put_clnt_odstate(stp->st_clnt_odstate);
1514 release_all_access(stp);
1515 if (stp->st_stateowner)
1516 nfs4_put_stateowner(stp->st_stateowner);
1517 WARN_ON(!list_empty(&stid->sc_cp_list));
1518 kmem_cache_free(stateid_slab, stid);
1519 }
1520
nfs4_free_lock_stateid(struct nfs4_stid * stid)1521 static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
1522 {
1523 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1524 struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
1525 struct nfsd_file *nf;
1526
1527 nf = find_any_file(stp->st_stid.sc_file);
1528 if (nf) {
1529 get_file(nf->nf_file);
1530 filp_close(nf->nf_file, (fl_owner_t)lo);
1531 nfsd_file_put(nf);
1532 }
1533 nfs4_free_ol_stateid(stid);
1534 }
1535
1536 /*
1537 * Put the persistent reference to an already unhashed generic stateid, while
1538 * holding the cl_lock. If it's the last reference, then put it onto the
1539 * reaplist for later destruction.
1540 */
put_ol_stateid_locked(struct nfs4_ol_stateid * stp,struct list_head * reaplist)1541 static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
1542 struct list_head *reaplist)
1543 {
1544 struct nfs4_stid *s = &stp->st_stid;
1545 struct nfs4_client *clp = s->sc_client;
1546
1547 lockdep_assert_held(&clp->cl_lock);
1548
1549 WARN_ON_ONCE(!list_empty(&stp->st_locks));
1550
1551 if (!refcount_dec_and_test(&s->sc_count)) {
1552 wake_up_all(&close_wq);
1553 return;
1554 }
1555
1556 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1557 if (s->sc_status & SC_STATUS_ADMIN_REVOKED)
1558 atomic_dec(&s->sc_client->cl_admin_revoked);
1559 list_add(&stp->st_locks, reaplist);
1560 }
1561
unhash_lock_stateid(struct nfs4_ol_stateid * stp)1562 static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
1563 {
1564 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1565
1566 if (!unhash_ol_stateid(stp))
1567 return false;
1568 list_del_init(&stp->st_locks);
1569 stp->st_stid.sc_status |= SC_STATUS_CLOSED;
1570 return true;
1571 }
1572
release_lock_stateid(struct nfs4_ol_stateid * stp)1573 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
1574 {
1575 struct nfs4_client *clp = stp->st_stid.sc_client;
1576 bool unhashed;
1577
1578 spin_lock(&clp->cl_lock);
1579 unhashed = unhash_lock_stateid(stp);
1580 spin_unlock(&clp->cl_lock);
1581 if (unhashed)
1582 nfs4_put_stid(&stp->st_stid);
1583 }
1584
unhash_lockowner_locked(struct nfs4_lockowner * lo)1585 static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
1586 {
1587 struct nfs4_client *clp = lo->lo_owner.so_client;
1588
1589 lockdep_assert_held(&clp->cl_lock);
1590
1591 list_del_init(&lo->lo_owner.so_strhash);
1592 }
1593
1594 /*
1595 * Free a list of generic stateids that were collected earlier after being
1596 * fully unhashed.
1597 */
1598 static void
free_ol_stateid_reaplist(struct list_head * reaplist)1599 free_ol_stateid_reaplist(struct list_head *reaplist)
1600 {
1601 struct nfs4_ol_stateid *stp;
1602 struct nfs4_file *fp;
1603
1604 might_sleep();
1605
1606 while (!list_empty(reaplist)) {
1607 stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
1608 st_locks);
1609 list_del(&stp->st_locks);
1610 fp = stp->st_stid.sc_file;
1611 stp->st_stid.sc_free(&stp->st_stid);
1612 if (fp)
1613 put_nfs4_file(fp);
1614 }
1615 }
1616
release_open_stateid_locks(struct nfs4_ol_stateid * open_stp,struct list_head * reaplist)1617 static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
1618 struct list_head *reaplist)
1619 {
1620 struct nfs4_ol_stateid *stp;
1621
1622 lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
1623
1624 while (!list_empty(&open_stp->st_locks)) {
1625 stp = list_entry(open_stp->st_locks.next,
1626 struct nfs4_ol_stateid, st_locks);
1627 unhash_lock_stateid(stp);
1628 put_ol_stateid_locked(stp, reaplist);
1629 }
1630 }
1631
unhash_open_stateid(struct nfs4_ol_stateid * stp,struct list_head * reaplist)1632 static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
1633 struct list_head *reaplist)
1634 {
1635 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1636
1637 if (!unhash_ol_stateid(stp))
1638 return false;
1639 release_open_stateid_locks(stp, reaplist);
1640 return true;
1641 }
1642
release_open_stateid(struct nfs4_ol_stateid * stp)1643 static void release_open_stateid(struct nfs4_ol_stateid *stp)
1644 {
1645 LIST_HEAD(reaplist);
1646
1647 spin_lock(&stp->st_stid.sc_client->cl_lock);
1648 stp->st_stid.sc_status |= SC_STATUS_CLOSED;
1649 if (unhash_open_stateid(stp, &reaplist))
1650 put_ol_stateid_locked(stp, &reaplist);
1651 spin_unlock(&stp->st_stid.sc_client->cl_lock);
1652 free_ol_stateid_reaplist(&reaplist);
1653 }
1654
nfs4_openowner_unhashed(struct nfs4_openowner * oo)1655 static bool nfs4_openowner_unhashed(struct nfs4_openowner *oo)
1656 {
1657 lockdep_assert_held(&oo->oo_owner.so_client->cl_lock);
1658
1659 return list_empty(&oo->oo_owner.so_strhash) &&
1660 list_empty(&oo->oo_perclient);
1661 }
1662
unhash_openowner_locked(struct nfs4_openowner * oo)1663 static void unhash_openowner_locked(struct nfs4_openowner *oo)
1664 {
1665 struct nfs4_client *clp = oo->oo_owner.so_client;
1666
1667 lockdep_assert_held(&clp->cl_lock);
1668
1669 list_del_init(&oo->oo_owner.so_strhash);
1670 list_del_init(&oo->oo_perclient);
1671 }
1672
release_last_closed_stateid(struct nfs4_openowner * oo)1673 static void release_last_closed_stateid(struct nfs4_openowner *oo)
1674 {
1675 struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
1676 nfsd_net_id);
1677 struct nfs4_ol_stateid *s;
1678
1679 spin_lock(&nn->client_lock);
1680 s = oo->oo_last_closed_stid;
1681 if (s) {
1682 list_del_init(&oo->oo_close_lru);
1683 oo->oo_last_closed_stid = NULL;
1684 }
1685 spin_unlock(&nn->client_lock);
1686 if (s)
1687 nfs4_put_stid(&s->st_stid);
1688 }
1689
release_openowner(struct nfs4_openowner * oo)1690 static void release_openowner(struct nfs4_openowner *oo)
1691 {
1692 struct nfs4_ol_stateid *stp;
1693 struct nfs4_client *clp = oo->oo_owner.so_client;
1694 LIST_HEAD(reaplist);
1695
1696 spin_lock(&clp->cl_lock);
1697 unhash_openowner_locked(oo);
1698 while (!list_empty(&oo->oo_owner.so_stateids)) {
1699 stp = list_first_entry(&oo->oo_owner.so_stateids,
1700 struct nfs4_ol_stateid, st_perstateowner);
1701 if (unhash_open_stateid(stp, &reaplist))
1702 put_ol_stateid_locked(stp, &reaplist);
1703 }
1704 spin_unlock(&clp->cl_lock);
1705 free_ol_stateid_reaplist(&reaplist);
1706 release_last_closed_stateid(oo);
1707 nfs4_put_stateowner(&oo->oo_owner);
1708 }
1709
find_one_sb_stid(struct nfs4_client * clp,struct super_block * sb,unsigned int sc_types)1710 static struct nfs4_stid *find_one_sb_stid(struct nfs4_client *clp,
1711 struct super_block *sb,
1712 unsigned int sc_types)
1713 {
1714 unsigned long id, tmp;
1715 struct nfs4_stid *stid;
1716
1717 spin_lock(&clp->cl_lock);
1718 idr_for_each_entry_ul(&clp->cl_stateids, stid, tmp, id)
1719 if ((stid->sc_type & sc_types) &&
1720 stid->sc_status == 0 &&
1721 stid->sc_file->fi_inode->i_sb == sb) {
1722 refcount_inc(&stid->sc_count);
1723 break;
1724 }
1725 spin_unlock(&clp->cl_lock);
1726 return stid;
1727 }
1728
1729 /**
1730 * nfsd4_revoke_states - revoke all nfsv4 states associated with given filesystem
1731 * @net: used to identify instance of nfsd (there is one per net namespace)
1732 * @sb: super_block used to identify target filesystem
1733 *
1734 * All nfs4 states (open, lock, delegation, layout) held by the server instance
1735 * and associated with a file on the given filesystem will be revoked resulting
1736 * in any files being closed and so all references from nfsd to the filesystem
1737 * being released. Thus nfsd will no longer prevent the filesystem from being
1738 * unmounted.
1739 *
1740 * The clients which own the states will subsequently being notified that the
1741 * states have been "admin-revoked".
1742 */
nfsd4_revoke_states(struct net * net,struct super_block * sb)1743 void nfsd4_revoke_states(struct net *net, struct super_block *sb)
1744 {
1745 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1746 unsigned int idhashval;
1747 unsigned int sc_types;
1748
1749 sc_types = SC_TYPE_OPEN | SC_TYPE_LOCK | SC_TYPE_DELEG | SC_TYPE_LAYOUT;
1750
1751 spin_lock(&nn->client_lock);
1752 for (idhashval = 0; idhashval < CLIENT_HASH_MASK; idhashval++) {
1753 struct list_head *head = &nn->conf_id_hashtbl[idhashval];
1754 struct nfs4_client *clp;
1755 retry:
1756 list_for_each_entry(clp, head, cl_idhash) {
1757 struct nfs4_stid *stid = find_one_sb_stid(clp, sb,
1758 sc_types);
1759 if (stid) {
1760 struct nfs4_ol_stateid *stp;
1761 struct nfs4_delegation *dp;
1762 struct nfs4_layout_stateid *ls;
1763
1764 spin_unlock(&nn->client_lock);
1765 switch (stid->sc_type) {
1766 case SC_TYPE_OPEN:
1767 stp = openlockstateid(stid);
1768 mutex_lock_nested(&stp->st_mutex,
1769 OPEN_STATEID_MUTEX);
1770
1771 spin_lock(&clp->cl_lock);
1772 if (stid->sc_status == 0) {
1773 stid->sc_status |=
1774 SC_STATUS_ADMIN_REVOKED;
1775 atomic_inc(&clp->cl_admin_revoked);
1776 spin_unlock(&clp->cl_lock);
1777 release_all_access(stp);
1778 } else
1779 spin_unlock(&clp->cl_lock);
1780 mutex_unlock(&stp->st_mutex);
1781 break;
1782 case SC_TYPE_LOCK:
1783 stp = openlockstateid(stid);
1784 mutex_lock_nested(&stp->st_mutex,
1785 LOCK_STATEID_MUTEX);
1786 spin_lock(&clp->cl_lock);
1787 if (stid->sc_status == 0) {
1788 struct nfs4_lockowner *lo =
1789 lockowner(stp->st_stateowner);
1790 struct nfsd_file *nf;
1791
1792 stid->sc_status |=
1793 SC_STATUS_ADMIN_REVOKED;
1794 atomic_inc(&clp->cl_admin_revoked);
1795 spin_unlock(&clp->cl_lock);
1796 nf = find_any_file(stp->st_stid.sc_file);
1797 if (nf) {
1798 get_file(nf->nf_file);
1799 filp_close(nf->nf_file,
1800 (fl_owner_t)lo);
1801 nfsd_file_put(nf);
1802 }
1803 release_all_access(stp);
1804 } else
1805 spin_unlock(&clp->cl_lock);
1806 mutex_unlock(&stp->st_mutex);
1807 break;
1808 case SC_TYPE_DELEG:
1809 refcount_inc(&stid->sc_count);
1810 dp = delegstateid(stid);
1811 spin_lock(&state_lock);
1812 if (!unhash_delegation_locked(
1813 dp, SC_STATUS_ADMIN_REVOKED))
1814 dp = NULL;
1815 spin_unlock(&state_lock);
1816 if (dp)
1817 revoke_delegation(dp);
1818 break;
1819 case SC_TYPE_LAYOUT:
1820 ls = layoutstateid(stid);
1821 nfsd4_close_layout(ls);
1822 break;
1823 }
1824 nfs4_put_stid(stid);
1825 spin_lock(&nn->client_lock);
1826 if (clp->cl_minorversion == 0)
1827 /* Allow cleanup after a lease period.
1828 * store_release ensures cleanup will
1829 * see any newly revoked states if it
1830 * sees the time updated.
1831 */
1832 nn->nfs40_last_revoke =
1833 ktime_get_boottime_seconds();
1834 goto retry;
1835 }
1836 }
1837 }
1838 spin_unlock(&nn->client_lock);
1839 }
1840
1841 static inline int
hash_sessionid(struct nfs4_sessionid * sessionid)1842 hash_sessionid(struct nfs4_sessionid *sessionid)
1843 {
1844 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
1845
1846 return sid->sequence % SESSION_HASH_SIZE;
1847 }
1848
1849 #ifdef CONFIG_SUNRPC_DEBUG
1850 static inline void
dump_sessionid(const char * fn,struct nfs4_sessionid * sessionid)1851 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1852 {
1853 u32 *ptr = (u32 *)(&sessionid->data[0]);
1854 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
1855 }
1856 #else
1857 static inline void
dump_sessionid(const char * fn,struct nfs4_sessionid * sessionid)1858 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1859 {
1860 }
1861 #endif
1862
1863 /*
1864 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1865 * won't be used for replay.
1866 */
nfsd4_bump_seqid(struct nfsd4_compound_state * cstate,__be32 nfserr)1867 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
1868 {
1869 struct nfs4_stateowner *so = cstate->replay_owner;
1870
1871 if (nfserr == nfserr_replay_me)
1872 return;
1873
1874 if (!seqid_mutating_err(ntohl(nfserr))) {
1875 nfsd4_cstate_clear_replay(cstate);
1876 return;
1877 }
1878 if (!so)
1879 return;
1880 if (so->so_is_open_owner)
1881 release_last_closed_stateid(openowner(so));
1882 so->so_seqid++;
1883 return;
1884 }
1885
1886 static void
gen_sessionid(struct nfsd4_session * ses)1887 gen_sessionid(struct nfsd4_session *ses)
1888 {
1889 struct nfs4_client *clp = ses->se_client;
1890 struct nfsd4_sessionid *sid;
1891
1892 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
1893 sid->clientid = clp->cl_clientid;
1894 sid->sequence = current_sessionid++;
1895 sid->reserved = 0;
1896 }
1897
1898 /*
1899 * The protocol defines ca_maxresponssize_cached to include the size of
1900 * the rpc header, but all we need to cache is the data starting after
1901 * the end of the initial SEQUENCE operation--the rest we regenerate
1902 * each time. Therefore we can advertise a ca_maxresponssize_cached
1903 * value that is the number of bytes in our cache plus a few additional
1904 * bytes. In order to stay on the safe side, and not promise more than
1905 * we can cache, those additional bytes must be the minimum possible: 24
1906 * bytes of rpc header (xid through accept state, with AUTH_NULL
1907 * verifier), 12 for the compound header (with zero-length tag), and 44
1908 * for the SEQUENCE op response:
1909 */
1910 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
1911
1912 static struct shrinker *nfsd_slot_shrinker;
1913 static DEFINE_SPINLOCK(nfsd_session_list_lock);
1914 static LIST_HEAD(nfsd_session_list);
1915 /* The sum of "target_slots-1" on every session. The shrinker can push this
1916 * down, though it can take a little while for the memory to actually
1917 * be freed. The "-1" is because we can never free slot 0 while the
1918 * session is active.
1919 */
1920 static atomic_t nfsd_total_target_slots = ATOMIC_INIT(0);
1921
1922 static void
free_session_slots(struct nfsd4_session * ses,int from)1923 free_session_slots(struct nfsd4_session *ses, int from)
1924 {
1925 int i;
1926
1927 if (from >= ses->se_fchannel.maxreqs)
1928 return;
1929
1930 for (i = from; i < ses->se_fchannel.maxreqs; i++) {
1931 struct nfsd4_slot *slot = xa_load(&ses->se_slots, i);
1932
1933 /*
1934 * Save the seqid in case we reactivate this slot.
1935 * This will never require a memory allocation so GFP
1936 * flag is irrelevant
1937 */
1938 xa_store(&ses->se_slots, i, xa_mk_value(slot->sl_seqid), 0);
1939 free_svc_cred(&slot->sl_cred);
1940 kfree(slot);
1941 }
1942 ses->se_fchannel.maxreqs = from;
1943 if (ses->se_target_maxslots > from) {
1944 int new_target = from ?: 1;
1945 atomic_sub(ses->se_target_maxslots - new_target, &nfsd_total_target_slots);
1946 ses->se_target_maxslots = new_target;
1947 }
1948 }
1949
1950 /**
1951 * reduce_session_slots - reduce the target max-slots of a session if possible
1952 * @ses: The session to affect
1953 * @dec: how much to decrease the target by
1954 *
1955 * This interface can be used by a shrinker to reduce the target max-slots
1956 * for a session so that some slots can eventually be freed.
1957 * It uses spin_trylock() as it may be called in a context where another
1958 * spinlock is held that has a dependency on client_lock. As shrinkers are
1959 * best-effort, skiping a session is client_lock is already held has no
1960 * great coast
1961 *
1962 * Return value:
1963 * The number of slots that the target was reduced by.
1964 */
1965 static int
reduce_session_slots(struct nfsd4_session * ses,int dec)1966 reduce_session_slots(struct nfsd4_session *ses, int dec)
1967 {
1968 struct nfsd_net *nn = net_generic(ses->se_client->net,
1969 nfsd_net_id);
1970 int ret = 0;
1971
1972 if (ses->se_target_maxslots <= 1)
1973 return ret;
1974 if (!spin_trylock(&nn->client_lock))
1975 return ret;
1976 ret = min(dec, ses->se_target_maxslots-1);
1977 ses->se_target_maxslots -= ret;
1978 atomic_sub(ret, &nfsd_total_target_slots);
1979 ses->se_slot_gen += 1;
1980 if (ses->se_slot_gen == 0) {
1981 int i;
1982 ses->se_slot_gen = 1;
1983 for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
1984 struct nfsd4_slot *slot = xa_load(&ses->se_slots, i);
1985 slot->sl_generation = 0;
1986 }
1987 }
1988 spin_unlock(&nn->client_lock);
1989 return ret;
1990 }
1991
1992 /*
1993 * We don't actually need to cache the rpc and session headers, so we
1994 * can allocate a little less for each slot:
1995 */
slot_bytes(struct nfsd4_channel_attrs * ca)1996 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1997 {
1998 u32 size;
1999
2000 if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
2001 size = 0;
2002 else
2003 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
2004 return size + sizeof(struct nfsd4_slot);
2005 }
2006
alloc_session(struct nfsd4_channel_attrs * fattrs,struct nfsd4_channel_attrs * battrs)2007 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
2008 struct nfsd4_channel_attrs *battrs)
2009 {
2010 int numslots = fattrs->maxreqs;
2011 int slotsize = slot_bytes(fattrs);
2012 struct nfsd4_session *new;
2013 struct nfsd4_slot *slot;
2014 int i;
2015
2016 new = kzalloc(sizeof(*new), GFP_KERNEL);
2017 if (!new)
2018 return NULL;
2019 xa_init(&new->se_slots);
2020 /* allocate each struct nfsd4_slot and data cache in one piece */
2021 slot = kzalloc(slotsize, GFP_KERNEL);
2022 if (!slot || xa_is_err(xa_store(&new->se_slots, 0, slot, GFP_KERNEL)))
2023 goto out_free;
2024
2025 for (i = 1; i < numslots; i++) {
2026 const gfp_t gfp = GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN;
2027 slot = kzalloc(slotsize, gfp);
2028 if (!slot)
2029 break;
2030 if (xa_is_err(xa_store(&new->se_slots, i, slot, gfp))) {
2031 kfree(slot);
2032 break;
2033 }
2034 }
2035 fattrs->maxreqs = i;
2036 memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
2037 new->se_target_maxslots = i;
2038 atomic_add(i - 1, &nfsd_total_target_slots);
2039 new->se_cb_slot_avail = ~0U;
2040 new->se_cb_highest_slot = min(battrs->maxreqs - 1,
2041 NFSD_BC_SLOT_TABLE_SIZE - 1);
2042 spin_lock_init(&new->se_lock);
2043 return new;
2044 out_free:
2045 kfree(slot);
2046 xa_destroy(&new->se_slots);
2047 kfree(new);
2048 return NULL;
2049 }
2050
free_conn(struct nfsd4_conn * c)2051 static void free_conn(struct nfsd4_conn *c)
2052 {
2053 svc_xprt_put(c->cn_xprt);
2054 kfree(c);
2055 }
2056
nfsd4_conn_lost(struct svc_xpt_user * u)2057 static void nfsd4_conn_lost(struct svc_xpt_user *u)
2058 {
2059 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
2060 struct nfs4_client *clp = c->cn_session->se_client;
2061
2062 trace_nfsd_cb_lost(clp);
2063
2064 spin_lock(&clp->cl_lock);
2065 if (!list_empty(&c->cn_persession)) {
2066 list_del(&c->cn_persession);
2067 free_conn(c);
2068 }
2069 nfsd4_probe_callback(clp);
2070 spin_unlock(&clp->cl_lock);
2071 }
2072
alloc_conn(struct svc_rqst * rqstp,u32 flags)2073 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
2074 {
2075 struct nfsd4_conn *conn;
2076
2077 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
2078 if (!conn)
2079 return NULL;
2080 svc_xprt_get(rqstp->rq_xprt);
2081 conn->cn_xprt = rqstp->rq_xprt;
2082 conn->cn_flags = flags;
2083 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
2084 return conn;
2085 }
2086
__nfsd4_hash_conn(struct nfsd4_conn * conn,struct nfsd4_session * ses)2087 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
2088 {
2089 conn->cn_session = ses;
2090 list_add(&conn->cn_persession, &ses->se_conns);
2091 }
2092
nfsd4_hash_conn(struct nfsd4_conn * conn,struct nfsd4_session * ses)2093 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
2094 {
2095 struct nfs4_client *clp = ses->se_client;
2096
2097 spin_lock(&clp->cl_lock);
2098 __nfsd4_hash_conn(conn, ses);
2099 spin_unlock(&clp->cl_lock);
2100 }
2101
nfsd4_register_conn(struct nfsd4_conn * conn)2102 static int nfsd4_register_conn(struct nfsd4_conn *conn)
2103 {
2104 conn->cn_xpt_user.callback = nfsd4_conn_lost;
2105 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
2106 }
2107
nfsd4_init_conn(struct svc_rqst * rqstp,struct nfsd4_conn * conn,struct nfsd4_session * ses)2108 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
2109 {
2110 int ret;
2111
2112 nfsd4_hash_conn(conn, ses);
2113 ret = nfsd4_register_conn(conn);
2114 if (ret)
2115 /* oops; xprt is already down: */
2116 nfsd4_conn_lost(&conn->cn_xpt_user);
2117 /* We may have gained or lost a callback channel: */
2118 nfsd4_probe_callback_sync(ses->se_client);
2119 }
2120
alloc_conn_from_crses(struct svc_rqst * rqstp,struct nfsd4_create_session * cses)2121 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
2122 {
2123 u32 dir = NFS4_CDFC4_FORE;
2124
2125 if (cses->flags & SESSION4_BACK_CHAN)
2126 dir |= NFS4_CDFC4_BACK;
2127 return alloc_conn(rqstp, dir);
2128 }
2129
2130 /* must be called under client_lock */
nfsd4_del_conns(struct nfsd4_session * s)2131 static void nfsd4_del_conns(struct nfsd4_session *s)
2132 {
2133 struct nfs4_client *clp = s->se_client;
2134 struct nfsd4_conn *c;
2135
2136 spin_lock(&clp->cl_lock);
2137 while (!list_empty(&s->se_conns)) {
2138 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
2139 list_del_init(&c->cn_persession);
2140 spin_unlock(&clp->cl_lock);
2141
2142 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
2143 free_conn(c);
2144
2145 spin_lock(&clp->cl_lock);
2146 }
2147 spin_unlock(&clp->cl_lock);
2148 }
2149
__free_session(struct nfsd4_session * ses)2150 static void __free_session(struct nfsd4_session *ses)
2151 {
2152 free_session_slots(ses, 0);
2153 xa_destroy(&ses->se_slots);
2154 kfree(ses);
2155 }
2156
free_session(struct nfsd4_session * ses)2157 static void free_session(struct nfsd4_session *ses)
2158 {
2159 nfsd4_del_conns(ses);
2160 __free_session(ses);
2161 }
2162
2163 static unsigned long
nfsd_slot_count(struct shrinker * s,struct shrink_control * sc)2164 nfsd_slot_count(struct shrinker *s, struct shrink_control *sc)
2165 {
2166 unsigned long cnt = atomic_read(&nfsd_total_target_slots);
2167
2168 return cnt ? cnt : SHRINK_EMPTY;
2169 }
2170
2171 static unsigned long
nfsd_slot_scan(struct shrinker * s,struct shrink_control * sc)2172 nfsd_slot_scan(struct shrinker *s, struct shrink_control *sc)
2173 {
2174 struct nfsd4_session *ses;
2175 unsigned long scanned = 0;
2176 unsigned long freed = 0;
2177
2178 spin_lock(&nfsd_session_list_lock);
2179 list_for_each_entry(ses, &nfsd_session_list, se_all_sessions) {
2180 freed += reduce_session_slots(ses, 1);
2181 scanned += 1;
2182 if (scanned >= sc->nr_to_scan) {
2183 /* Move starting point for next scan */
2184 list_move(&nfsd_session_list, &ses->se_all_sessions);
2185 break;
2186 }
2187 }
2188 spin_unlock(&nfsd_session_list_lock);
2189 sc->nr_scanned = scanned;
2190 return freed;
2191 }
2192
init_session(struct svc_rqst * rqstp,struct nfsd4_session * new,struct nfs4_client * clp,struct nfsd4_create_session * cses)2193 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
2194 {
2195 int idx;
2196 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2197
2198 new->se_client = clp;
2199 gen_sessionid(new);
2200
2201 INIT_LIST_HEAD(&new->se_conns);
2202
2203 atomic_set(&new->se_ref, 0);
2204 new->se_dead = false;
2205 new->se_cb_prog = cses->callback_prog;
2206 new->se_cb_sec = cses->cb_sec;
2207
2208 for (idx = 0; idx < NFSD_BC_SLOT_TABLE_SIZE; ++idx)
2209 new->se_cb_seq_nr[idx] = 1;
2210
2211 idx = hash_sessionid(&new->se_sessionid);
2212 list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
2213 spin_lock(&clp->cl_lock);
2214 list_add(&new->se_perclnt, &clp->cl_sessions);
2215 spin_unlock(&clp->cl_lock);
2216
2217 spin_lock(&nfsd_session_list_lock);
2218 list_add_tail(&new->se_all_sessions, &nfsd_session_list);
2219 spin_unlock(&nfsd_session_list_lock);
2220
2221 {
2222 struct sockaddr *sa = svc_addr(rqstp);
2223 /*
2224 * This is a little silly; with sessions there's no real
2225 * use for the callback address. Use the peer address
2226 * as a reasonable default for now, but consider fixing
2227 * the rpc client not to require an address in the
2228 * future:
2229 */
2230 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
2231 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
2232 }
2233 }
2234
2235 /* caller must hold client_lock */
2236 static struct nfsd4_session *
__find_in_sessionid_hashtbl(struct nfs4_sessionid * sessionid,struct net * net)2237 __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
2238 {
2239 struct nfsd4_session *elem;
2240 int idx;
2241 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2242
2243 lockdep_assert_held(&nn->client_lock);
2244
2245 dump_sessionid(__func__, sessionid);
2246 idx = hash_sessionid(sessionid);
2247 /* Search in the appropriate list */
2248 list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
2249 if (!memcmp(elem->se_sessionid.data, sessionid->data,
2250 NFS4_MAX_SESSIONID_LEN)) {
2251 return elem;
2252 }
2253 }
2254
2255 dprintk("%s: session not found\n", __func__);
2256 return NULL;
2257 }
2258
2259 static struct nfsd4_session *
find_in_sessionid_hashtbl(struct nfs4_sessionid * sessionid,struct net * net,__be32 * ret)2260 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
2261 __be32 *ret)
2262 {
2263 struct nfsd4_session *session;
2264 __be32 status = nfserr_badsession;
2265
2266 session = __find_in_sessionid_hashtbl(sessionid, net);
2267 if (!session)
2268 goto out;
2269 status = nfsd4_get_session_locked(session);
2270 if (status)
2271 session = NULL;
2272 out:
2273 *ret = status;
2274 return session;
2275 }
2276
2277 /* caller must hold client_lock */
2278 static void
unhash_session(struct nfsd4_session * ses)2279 unhash_session(struct nfsd4_session *ses)
2280 {
2281 struct nfs4_client *clp = ses->se_client;
2282 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2283
2284 lockdep_assert_held(&nn->client_lock);
2285
2286 list_del(&ses->se_hash);
2287 spin_lock(&ses->se_client->cl_lock);
2288 list_del(&ses->se_perclnt);
2289 spin_unlock(&ses->se_client->cl_lock);
2290 spin_lock(&nfsd_session_list_lock);
2291 list_del(&ses->se_all_sessions);
2292 spin_unlock(&nfsd_session_list_lock);
2293 }
2294
2295 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
2296 static int
STALE_CLIENTID(clientid_t * clid,struct nfsd_net * nn)2297 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
2298 {
2299 /*
2300 * We're assuming the clid was not given out from a boot
2301 * precisely 2^32 (about 136 years) before this one. That seems
2302 * a safe assumption:
2303 */
2304 if (clid->cl_boot == (u32)nn->boot_time)
2305 return 0;
2306 trace_nfsd_clid_stale(clid);
2307 return 1;
2308 }
2309
alloc_client(struct xdr_netobj name,struct nfsd_net * nn)2310 static struct nfs4_client *alloc_client(struct xdr_netobj name,
2311 struct nfsd_net *nn)
2312 {
2313 struct nfs4_client *clp;
2314 int i;
2315
2316 if (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients &&
2317 atomic_read(&nn->nfsd_courtesy_clients) > 0)
2318 mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
2319
2320 clp = kmem_cache_zalloc(client_slab, GFP_KERNEL);
2321 if (clp == NULL)
2322 return NULL;
2323 xdr_netobj_dup(&clp->cl_name, &name, GFP_KERNEL);
2324 if (clp->cl_name.data == NULL)
2325 goto err_no_name;
2326 clp->cl_ownerstr_hashtbl = kmalloc_array(OWNER_HASH_SIZE,
2327 sizeof(struct list_head),
2328 GFP_KERNEL);
2329 if (!clp->cl_ownerstr_hashtbl)
2330 goto err_no_hashtbl;
2331 clp->cl_callback_wq = alloc_ordered_workqueue("nfsd4_callbacks", 0);
2332 if (!clp->cl_callback_wq)
2333 goto err_no_callback_wq;
2334
2335 for (i = 0; i < OWNER_HASH_SIZE; i++)
2336 INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
2337 INIT_LIST_HEAD(&clp->cl_sessions);
2338 idr_init(&clp->cl_stateids);
2339 atomic_set(&clp->cl_rpc_users, 0);
2340 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
2341 clp->cl_state = NFSD4_ACTIVE;
2342 atomic_inc(&nn->nfs4_client_count);
2343 atomic_set(&clp->cl_delegs_in_recall, 0);
2344 INIT_LIST_HEAD(&clp->cl_idhash);
2345 INIT_LIST_HEAD(&clp->cl_openowners);
2346 INIT_LIST_HEAD(&clp->cl_delegations);
2347 INIT_LIST_HEAD(&clp->cl_lru);
2348 INIT_LIST_HEAD(&clp->cl_revoked);
2349 #ifdef CONFIG_NFSD_PNFS
2350 INIT_LIST_HEAD(&clp->cl_lo_states);
2351 #endif
2352 INIT_LIST_HEAD(&clp->async_copies);
2353 spin_lock_init(&clp->async_lock);
2354 spin_lock_init(&clp->cl_lock);
2355 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
2356 return clp;
2357 err_no_callback_wq:
2358 kfree(clp->cl_ownerstr_hashtbl);
2359 err_no_hashtbl:
2360 kfree(clp->cl_name.data);
2361 err_no_name:
2362 kmem_cache_free(client_slab, clp);
2363 return NULL;
2364 }
2365
__free_client(struct kref * k)2366 static void __free_client(struct kref *k)
2367 {
2368 struct nfsdfs_client *c = container_of(k, struct nfsdfs_client, cl_ref);
2369 struct nfs4_client *clp = container_of(c, struct nfs4_client, cl_nfsdfs);
2370
2371 free_svc_cred(&clp->cl_cred);
2372 destroy_workqueue(clp->cl_callback_wq);
2373 kfree(clp->cl_ownerstr_hashtbl);
2374 kfree(clp->cl_name.data);
2375 kfree(clp->cl_nii_domain.data);
2376 kfree(clp->cl_nii_name.data);
2377 idr_destroy(&clp->cl_stateids);
2378 kfree(clp->cl_ra);
2379 kmem_cache_free(client_slab, clp);
2380 }
2381
drop_client(struct nfs4_client * clp)2382 static void drop_client(struct nfs4_client *clp)
2383 {
2384 kref_put(&clp->cl_nfsdfs.cl_ref, __free_client);
2385 }
2386
2387 static void
free_client(struct nfs4_client * clp)2388 free_client(struct nfs4_client *clp)
2389 {
2390 while (!list_empty(&clp->cl_sessions)) {
2391 struct nfsd4_session *ses;
2392 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
2393 se_perclnt);
2394 list_del(&ses->se_perclnt);
2395 WARN_ON_ONCE(atomic_read(&ses->se_ref));
2396 free_session(ses);
2397 }
2398 rpc_destroy_wait_queue(&clp->cl_cb_waitq);
2399 if (clp->cl_nfsd_dentry) {
2400 nfsd_client_rmdir(clp->cl_nfsd_dentry);
2401 clp->cl_nfsd_dentry = NULL;
2402 wake_up_all(&expiry_wq);
2403 }
2404 drop_client(clp);
2405 }
2406
2407 /* must be called under the client_lock */
2408 static void
unhash_client_locked(struct nfs4_client * clp)2409 unhash_client_locked(struct nfs4_client *clp)
2410 {
2411 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2412 struct nfsd4_session *ses;
2413
2414 lockdep_assert_held(&nn->client_lock);
2415
2416 /* Mark the client as expired! */
2417 clp->cl_time = 0;
2418 /* Make it invisible */
2419 if (!list_empty(&clp->cl_idhash)) {
2420 list_del_init(&clp->cl_idhash);
2421 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
2422 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
2423 else
2424 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2425 }
2426 list_del_init(&clp->cl_lru);
2427 spin_lock(&clp->cl_lock);
2428 spin_lock(&nfsd_session_list_lock);
2429 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt) {
2430 list_del_init(&ses->se_hash);
2431 list_del_init(&ses->se_all_sessions);
2432 }
2433 spin_unlock(&nfsd_session_list_lock);
2434 spin_unlock(&clp->cl_lock);
2435 }
2436
2437 static void
unhash_client(struct nfs4_client * clp)2438 unhash_client(struct nfs4_client *clp)
2439 {
2440 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2441
2442 spin_lock(&nn->client_lock);
2443 unhash_client_locked(clp);
2444 spin_unlock(&nn->client_lock);
2445 }
2446
mark_client_expired_locked(struct nfs4_client * clp)2447 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
2448 {
2449 int users = atomic_read(&clp->cl_rpc_users);
2450
2451 trace_nfsd_mark_client_expired(clp, users);
2452
2453 if (users)
2454 return nfserr_jukebox;
2455 unhash_client_locked(clp);
2456 return nfs_ok;
2457 }
2458
2459 static void
__destroy_client(struct nfs4_client * clp)2460 __destroy_client(struct nfs4_client *clp)
2461 {
2462 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2463 int i;
2464 struct nfs4_openowner *oo;
2465 struct nfs4_delegation *dp;
2466 LIST_HEAD(reaplist);
2467
2468 spin_lock(&state_lock);
2469 while (!list_empty(&clp->cl_delegations)) {
2470 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
2471 unhash_delegation_locked(dp, SC_STATUS_CLOSED);
2472 list_add(&dp->dl_recall_lru, &reaplist);
2473 }
2474 spin_unlock(&state_lock);
2475 while (!list_empty(&reaplist)) {
2476 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
2477 list_del_init(&dp->dl_recall_lru);
2478 destroy_unhashed_deleg(dp);
2479 }
2480 while (!list_empty(&clp->cl_revoked)) {
2481 dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
2482 list_del_init(&dp->dl_recall_lru);
2483 nfs4_put_stid(&dp->dl_stid);
2484 }
2485 while (!list_empty(&clp->cl_openowners)) {
2486 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
2487 nfs4_get_stateowner(&oo->oo_owner);
2488 release_openowner(oo);
2489 }
2490 for (i = 0; i < OWNER_HASH_SIZE; i++) {
2491 struct nfs4_stateowner *so, *tmp;
2492
2493 list_for_each_entry_safe(so, tmp, &clp->cl_ownerstr_hashtbl[i],
2494 so_strhash) {
2495 /* Should be no openowners at this point */
2496 WARN_ON_ONCE(so->so_is_open_owner);
2497 remove_blocked_locks(lockowner(so));
2498 }
2499 }
2500 nfsd4_return_all_client_layouts(clp);
2501 nfsd4_shutdown_copy(clp);
2502 nfsd4_shutdown_callback(clp);
2503 if (clp->cl_cb_conn.cb_xprt)
2504 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
2505 atomic_add_unless(&nn->nfs4_client_count, -1, 0);
2506 nfsd4_dec_courtesy_client_count(nn, clp);
2507 free_client(clp);
2508 wake_up_all(&expiry_wq);
2509 }
2510
2511 static void
destroy_client(struct nfs4_client * clp)2512 destroy_client(struct nfs4_client *clp)
2513 {
2514 unhash_client(clp);
2515 __destroy_client(clp);
2516 }
2517
inc_reclaim_complete(struct nfs4_client * clp)2518 static void inc_reclaim_complete(struct nfs4_client *clp)
2519 {
2520 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2521
2522 if (!nn->track_reclaim_completes)
2523 return;
2524 if (!nfsd4_find_reclaim_client(clp->cl_name, nn))
2525 return;
2526 if (atomic_inc_return(&nn->nr_reclaim_complete) ==
2527 nn->reclaim_str_hashtbl_size) {
2528 printk(KERN_INFO "NFSD: all clients done reclaiming, ending NFSv4 grace period (net %x)\n",
2529 clp->net->ns.inum);
2530 nfsd4_end_grace(nn);
2531 }
2532 }
2533
expire_client(struct nfs4_client * clp)2534 static void expire_client(struct nfs4_client *clp)
2535 {
2536 unhash_client(clp);
2537 nfsd4_client_record_remove(clp);
2538 __destroy_client(clp);
2539 }
2540
copy_verf(struct nfs4_client * target,nfs4_verifier * source)2541 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
2542 {
2543 memcpy(target->cl_verifier.data, source->data,
2544 sizeof(target->cl_verifier.data));
2545 }
2546
copy_clid(struct nfs4_client * target,struct nfs4_client * source)2547 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
2548 {
2549 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
2550 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
2551 }
2552
copy_cred(struct svc_cred * target,struct svc_cred * source)2553 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
2554 {
2555 target->cr_principal = kstrdup(source->cr_principal, GFP_KERNEL);
2556 target->cr_raw_principal = kstrdup(source->cr_raw_principal,
2557 GFP_KERNEL);
2558 target->cr_targ_princ = kstrdup(source->cr_targ_princ, GFP_KERNEL);
2559 if ((source->cr_principal && !target->cr_principal) ||
2560 (source->cr_raw_principal && !target->cr_raw_principal) ||
2561 (source->cr_targ_princ && !target->cr_targ_princ))
2562 return -ENOMEM;
2563
2564 target->cr_flavor = source->cr_flavor;
2565 target->cr_uid = source->cr_uid;
2566 target->cr_gid = source->cr_gid;
2567 target->cr_group_info = source->cr_group_info;
2568 get_group_info(target->cr_group_info);
2569 target->cr_gss_mech = source->cr_gss_mech;
2570 if (source->cr_gss_mech)
2571 gss_mech_get(source->cr_gss_mech);
2572 return 0;
2573 }
2574
2575 static int
compare_blob(const struct xdr_netobj * o1,const struct xdr_netobj * o2)2576 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
2577 {
2578 if (o1->len < o2->len)
2579 return -1;
2580 if (o1->len > o2->len)
2581 return 1;
2582 return memcmp(o1->data, o2->data, o1->len);
2583 }
2584
2585 static int
same_verf(nfs4_verifier * v1,nfs4_verifier * v2)2586 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
2587 {
2588 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
2589 }
2590
2591 static int
same_clid(clientid_t * cl1,clientid_t * cl2)2592 same_clid(clientid_t *cl1, clientid_t *cl2)
2593 {
2594 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
2595 }
2596
groups_equal(struct group_info * g1,struct group_info * g2)2597 static bool groups_equal(struct group_info *g1, struct group_info *g2)
2598 {
2599 int i;
2600
2601 if (g1->ngroups != g2->ngroups)
2602 return false;
2603 for (i=0; i<g1->ngroups; i++)
2604 if (!gid_eq(g1->gid[i], g2->gid[i]))
2605 return false;
2606 return true;
2607 }
2608
2609 /*
2610 * RFC 3530 language requires clid_inuse be returned when the
2611 * "principal" associated with a requests differs from that previously
2612 * used. We use uid, gid's, and gss principal string as our best
2613 * approximation. We also don't want to allow non-gss use of a client
2614 * established using gss: in theory cr_principal should catch that
2615 * change, but in practice cr_principal can be null even in the gss case
2616 * since gssd doesn't always pass down a principal string.
2617 */
is_gss_cred(struct svc_cred * cr)2618 static bool is_gss_cred(struct svc_cred *cr)
2619 {
2620 /* Is cr_flavor one of the gss "pseudoflavors"?: */
2621 return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
2622 }
2623
2624
2625 static bool
same_creds(struct svc_cred * cr1,struct svc_cred * cr2)2626 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
2627 {
2628 if ((is_gss_cred(cr1) != is_gss_cred(cr2))
2629 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
2630 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
2631 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
2632 return false;
2633 /* XXX: check that cr_targ_princ fields match ? */
2634 if (cr1->cr_principal == cr2->cr_principal)
2635 return true;
2636 if (!cr1->cr_principal || !cr2->cr_principal)
2637 return false;
2638 return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
2639 }
2640
svc_rqst_integrity_protected(struct svc_rqst * rqstp)2641 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
2642 {
2643 struct svc_cred *cr = &rqstp->rq_cred;
2644 u32 service;
2645
2646 if (!cr->cr_gss_mech)
2647 return false;
2648 service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
2649 return service == RPC_GSS_SVC_INTEGRITY ||
2650 service == RPC_GSS_SVC_PRIVACY;
2651 }
2652
nfsd4_mach_creds_match(struct nfs4_client * cl,struct svc_rqst * rqstp)2653 bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
2654 {
2655 struct svc_cred *cr = &rqstp->rq_cred;
2656
2657 if (!cl->cl_mach_cred)
2658 return true;
2659 if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
2660 return false;
2661 if (!svc_rqst_integrity_protected(rqstp))
2662 return false;
2663 if (cl->cl_cred.cr_raw_principal)
2664 return 0 == strcmp(cl->cl_cred.cr_raw_principal,
2665 cr->cr_raw_principal);
2666 if (!cr->cr_principal)
2667 return false;
2668 return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
2669 }
2670
gen_confirm(struct nfs4_client * clp,struct nfsd_net * nn)2671 static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
2672 {
2673 __be32 verf[2];
2674
2675 /*
2676 * This is opaque to client, so no need to byte-swap. Use
2677 * __force to keep sparse happy
2678 */
2679 verf[0] = (__force __be32)(u32)ktime_get_real_seconds();
2680 verf[1] = (__force __be32)nn->clverifier_counter++;
2681 memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
2682 }
2683
gen_clid(struct nfs4_client * clp,struct nfsd_net * nn)2684 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
2685 {
2686 clp->cl_clientid.cl_boot = (u32)nn->boot_time;
2687 clp->cl_clientid.cl_id = nn->clientid_counter++;
2688 gen_confirm(clp, nn);
2689 }
2690
2691 static struct nfs4_stid *
find_stateid_locked(struct nfs4_client * cl,stateid_t * t)2692 find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
2693 {
2694 struct nfs4_stid *ret;
2695
2696 ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
2697 if (!ret || !ret->sc_type)
2698 return NULL;
2699 return ret;
2700 }
2701
2702 static struct nfs4_stid *
find_stateid_by_type(struct nfs4_client * cl,stateid_t * t,unsigned short typemask,unsigned short ok_states)2703 find_stateid_by_type(struct nfs4_client *cl, stateid_t *t,
2704 unsigned short typemask, unsigned short ok_states)
2705 {
2706 struct nfs4_stid *s;
2707
2708 spin_lock(&cl->cl_lock);
2709 s = find_stateid_locked(cl, t);
2710 if (s != NULL) {
2711 if ((s->sc_status & ~ok_states) == 0 &&
2712 (typemask & s->sc_type))
2713 refcount_inc(&s->sc_count);
2714 else
2715 s = NULL;
2716 }
2717 spin_unlock(&cl->cl_lock);
2718 return s;
2719 }
2720
get_nfsdfs_clp(struct inode * inode)2721 static struct nfs4_client *get_nfsdfs_clp(struct inode *inode)
2722 {
2723 struct nfsdfs_client *nc;
2724 nc = get_nfsdfs_client(inode);
2725 if (!nc)
2726 return NULL;
2727 return container_of(nc, struct nfs4_client, cl_nfsdfs);
2728 }
2729
seq_quote_mem(struct seq_file * m,char * data,int len)2730 static void seq_quote_mem(struct seq_file *m, char *data, int len)
2731 {
2732 seq_puts(m, "\"");
2733 seq_escape_mem(m, data, len, ESCAPE_HEX | ESCAPE_NAP | ESCAPE_APPEND, "\"\\");
2734 seq_puts(m, "\"");
2735 }
2736
cb_state2str(int state)2737 static const char *cb_state2str(int state)
2738 {
2739 switch (state) {
2740 case NFSD4_CB_UP:
2741 return "UP";
2742 case NFSD4_CB_UNKNOWN:
2743 return "UNKNOWN";
2744 case NFSD4_CB_DOWN:
2745 return "DOWN";
2746 case NFSD4_CB_FAULT:
2747 return "FAULT";
2748 }
2749 return "UNDEFINED";
2750 }
2751
client_info_show(struct seq_file * m,void * v)2752 static int client_info_show(struct seq_file *m, void *v)
2753 {
2754 struct inode *inode = file_inode(m->file);
2755 struct nfsd4_session *ses;
2756 struct nfs4_client *clp;
2757 u64 clid;
2758
2759 clp = get_nfsdfs_clp(inode);
2760 if (!clp)
2761 return -ENXIO;
2762 memcpy(&clid, &clp->cl_clientid, sizeof(clid));
2763 seq_printf(m, "clientid: 0x%llx\n", clid);
2764 seq_printf(m, "address: \"%pISpc\"\n", (struct sockaddr *)&clp->cl_addr);
2765
2766 if (clp->cl_state == NFSD4_COURTESY)
2767 seq_puts(m, "status: courtesy\n");
2768 else if (clp->cl_state == NFSD4_EXPIRABLE)
2769 seq_puts(m, "status: expirable\n");
2770 else if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
2771 seq_puts(m, "status: confirmed\n");
2772 else
2773 seq_puts(m, "status: unconfirmed\n");
2774 seq_printf(m, "seconds from last renew: %lld\n",
2775 ktime_get_boottime_seconds() - clp->cl_time);
2776 seq_puts(m, "name: ");
2777 seq_quote_mem(m, clp->cl_name.data, clp->cl_name.len);
2778 seq_printf(m, "\nminor version: %d\n", clp->cl_minorversion);
2779 if (clp->cl_nii_domain.data) {
2780 seq_puts(m, "Implementation domain: ");
2781 seq_quote_mem(m, clp->cl_nii_domain.data,
2782 clp->cl_nii_domain.len);
2783 seq_puts(m, "\nImplementation name: ");
2784 seq_quote_mem(m, clp->cl_nii_name.data, clp->cl_nii_name.len);
2785 seq_printf(m, "\nImplementation time: [%lld, %ld]\n",
2786 clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec);
2787 }
2788 seq_printf(m, "callback state: %s\n", cb_state2str(clp->cl_cb_state));
2789 seq_printf(m, "callback address: \"%pISpc\"\n", &clp->cl_cb_conn.cb_addr);
2790 seq_printf(m, "admin-revoked states: %d\n",
2791 atomic_read(&clp->cl_admin_revoked));
2792 spin_lock(&clp->cl_lock);
2793 seq_printf(m, "session slots:");
2794 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
2795 seq_printf(m, " %u", ses->se_fchannel.maxreqs);
2796 seq_printf(m, "\nsession target slots:");
2797 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
2798 seq_printf(m, " %u", ses->se_target_maxslots);
2799 spin_unlock(&clp->cl_lock);
2800 seq_puts(m, "\n");
2801
2802 drop_client(clp);
2803
2804 return 0;
2805 }
2806
2807 DEFINE_SHOW_ATTRIBUTE(client_info);
2808
states_start(struct seq_file * s,loff_t * pos)2809 static void *states_start(struct seq_file *s, loff_t *pos)
2810 __acquires(&clp->cl_lock)
2811 {
2812 struct nfs4_client *clp = s->private;
2813 unsigned long id = *pos;
2814 void *ret;
2815
2816 spin_lock(&clp->cl_lock);
2817 ret = idr_get_next_ul(&clp->cl_stateids, &id);
2818 *pos = id;
2819 return ret;
2820 }
2821
states_next(struct seq_file * s,void * v,loff_t * pos)2822 static void *states_next(struct seq_file *s, void *v, loff_t *pos)
2823 {
2824 struct nfs4_client *clp = s->private;
2825 unsigned long id = *pos;
2826 void *ret;
2827
2828 id = *pos;
2829 id++;
2830 ret = idr_get_next_ul(&clp->cl_stateids, &id);
2831 *pos = id;
2832 return ret;
2833 }
2834
states_stop(struct seq_file * s,void * v)2835 static void states_stop(struct seq_file *s, void *v)
2836 __releases(&clp->cl_lock)
2837 {
2838 struct nfs4_client *clp = s->private;
2839
2840 spin_unlock(&clp->cl_lock);
2841 }
2842
nfs4_show_fname(struct seq_file * s,struct nfsd_file * f)2843 static void nfs4_show_fname(struct seq_file *s, struct nfsd_file *f)
2844 {
2845 seq_printf(s, "filename: \"%pD2\"", f->nf_file);
2846 }
2847
nfs4_show_superblock(struct seq_file * s,struct nfsd_file * f)2848 static void nfs4_show_superblock(struct seq_file *s, struct nfsd_file *f)
2849 {
2850 struct inode *inode = file_inode(f->nf_file);
2851
2852 seq_printf(s, "superblock: \"%02x:%02x:%ld\"",
2853 MAJOR(inode->i_sb->s_dev),
2854 MINOR(inode->i_sb->s_dev),
2855 inode->i_ino);
2856 }
2857
nfs4_show_owner(struct seq_file * s,struct nfs4_stateowner * oo)2858 static void nfs4_show_owner(struct seq_file *s, struct nfs4_stateowner *oo)
2859 {
2860 seq_puts(s, "owner: ");
2861 seq_quote_mem(s, oo->so_owner.data, oo->so_owner.len);
2862 }
2863
nfs4_show_stateid(struct seq_file * s,stateid_t * stid)2864 static void nfs4_show_stateid(struct seq_file *s, stateid_t *stid)
2865 {
2866 seq_printf(s, "0x%.8x", stid->si_generation);
2867 seq_printf(s, "%12phN", &stid->si_opaque);
2868 }
2869
nfs4_show_open(struct seq_file * s,struct nfs4_stid * st)2870 static int nfs4_show_open(struct seq_file *s, struct nfs4_stid *st)
2871 {
2872 struct nfs4_ol_stateid *ols;
2873 struct nfs4_file *nf;
2874 struct nfsd_file *file;
2875 struct nfs4_stateowner *oo;
2876 unsigned int access, deny;
2877
2878 ols = openlockstateid(st);
2879 oo = ols->st_stateowner;
2880 nf = st->sc_file;
2881
2882 seq_puts(s, "- ");
2883 nfs4_show_stateid(s, &st->sc_stateid);
2884 seq_puts(s, ": { type: open, ");
2885
2886 access = bmap_to_share_mode(ols->st_access_bmap);
2887 deny = bmap_to_share_mode(ols->st_deny_bmap);
2888
2889 seq_printf(s, "access: %s%s, ",
2890 access & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2891 access & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2892 seq_printf(s, "deny: %s%s, ",
2893 deny & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2894 deny & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2895
2896 if (nf) {
2897 spin_lock(&nf->fi_lock);
2898 file = find_any_file_locked(nf);
2899 if (file) {
2900 nfs4_show_superblock(s, file);
2901 seq_puts(s, ", ");
2902 nfs4_show_fname(s, file);
2903 seq_puts(s, ", ");
2904 }
2905 spin_unlock(&nf->fi_lock);
2906 } else
2907 seq_puts(s, "closed, ");
2908 nfs4_show_owner(s, oo);
2909 if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
2910 seq_puts(s, ", admin-revoked");
2911 seq_puts(s, " }\n");
2912 return 0;
2913 }
2914
nfs4_show_lock(struct seq_file * s,struct nfs4_stid * st)2915 static int nfs4_show_lock(struct seq_file *s, struct nfs4_stid *st)
2916 {
2917 struct nfs4_ol_stateid *ols;
2918 struct nfs4_file *nf;
2919 struct nfsd_file *file;
2920 struct nfs4_stateowner *oo;
2921
2922 ols = openlockstateid(st);
2923 oo = ols->st_stateowner;
2924 nf = st->sc_file;
2925
2926 seq_puts(s, "- ");
2927 nfs4_show_stateid(s, &st->sc_stateid);
2928 seq_puts(s, ": { type: lock, ");
2929
2930 spin_lock(&nf->fi_lock);
2931 file = find_any_file_locked(nf);
2932 if (file) {
2933 /*
2934 * Note: a lock stateid isn't really the same thing as a lock,
2935 * it's the locking state held by one owner on a file, and there
2936 * may be multiple (or no) lock ranges associated with it.
2937 * (Same for the matter is true of open stateids.)
2938 */
2939
2940 nfs4_show_superblock(s, file);
2941 /* XXX: open stateid? */
2942 seq_puts(s, ", ");
2943 nfs4_show_fname(s, file);
2944 seq_puts(s, ", ");
2945 }
2946 nfs4_show_owner(s, oo);
2947 if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
2948 seq_puts(s, ", admin-revoked");
2949 seq_puts(s, " }\n");
2950 spin_unlock(&nf->fi_lock);
2951 return 0;
2952 }
2953
nfs4_show_deleg_type(u32 dl_type)2954 static char *nfs4_show_deleg_type(u32 dl_type)
2955 {
2956 switch (dl_type) {
2957 case OPEN_DELEGATE_READ:
2958 return "r";
2959 case OPEN_DELEGATE_WRITE:
2960 return "w";
2961 case OPEN_DELEGATE_READ_ATTRS_DELEG:
2962 return "ra";
2963 case OPEN_DELEGATE_WRITE_ATTRS_DELEG:
2964 return "wa";
2965 }
2966 return "?";
2967 }
2968
nfs4_show_deleg(struct seq_file * s,struct nfs4_stid * st)2969 static int nfs4_show_deleg(struct seq_file *s, struct nfs4_stid *st)
2970 {
2971 struct nfs4_delegation *ds;
2972 struct nfs4_file *nf;
2973 struct nfsd_file *file;
2974
2975 ds = delegstateid(st);
2976 nf = st->sc_file;
2977
2978 seq_puts(s, "- ");
2979 nfs4_show_stateid(s, &st->sc_stateid);
2980 seq_puts(s, ": { type: deleg, ");
2981
2982 seq_printf(s, "access: %s", nfs4_show_deleg_type(ds->dl_type));
2983
2984 /* XXX: lease time, whether it's being recalled. */
2985
2986 spin_lock(&nf->fi_lock);
2987 file = nf->fi_deleg_file;
2988 if (file) {
2989 seq_puts(s, ", ");
2990 nfs4_show_superblock(s, file);
2991 seq_puts(s, ", ");
2992 nfs4_show_fname(s, file);
2993 }
2994 spin_unlock(&nf->fi_lock);
2995 if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
2996 seq_puts(s, ", admin-revoked");
2997 seq_puts(s, " }\n");
2998 return 0;
2999 }
3000
nfs4_show_layout(struct seq_file * s,struct nfs4_stid * st)3001 static int nfs4_show_layout(struct seq_file *s, struct nfs4_stid *st)
3002 {
3003 struct nfs4_layout_stateid *ls;
3004 struct nfsd_file *file;
3005
3006 ls = container_of(st, struct nfs4_layout_stateid, ls_stid);
3007
3008 seq_puts(s, "- ");
3009 nfs4_show_stateid(s, &st->sc_stateid);
3010 seq_puts(s, ": { type: layout");
3011
3012 /* XXX: What else would be useful? */
3013
3014 spin_lock(&ls->ls_stid.sc_file->fi_lock);
3015 file = ls->ls_file;
3016 if (file) {
3017 seq_puts(s, ", ");
3018 nfs4_show_superblock(s, file);
3019 seq_puts(s, ", ");
3020 nfs4_show_fname(s, file);
3021 }
3022 spin_unlock(&ls->ls_stid.sc_file->fi_lock);
3023 if (st->sc_status & SC_STATUS_ADMIN_REVOKED)
3024 seq_puts(s, ", admin-revoked");
3025 seq_puts(s, " }\n");
3026
3027 return 0;
3028 }
3029
states_show(struct seq_file * s,void * v)3030 static int states_show(struct seq_file *s, void *v)
3031 {
3032 struct nfs4_stid *st = v;
3033
3034 switch (st->sc_type) {
3035 case SC_TYPE_OPEN:
3036 return nfs4_show_open(s, st);
3037 case SC_TYPE_LOCK:
3038 return nfs4_show_lock(s, st);
3039 case SC_TYPE_DELEG:
3040 return nfs4_show_deleg(s, st);
3041 case SC_TYPE_LAYOUT:
3042 return nfs4_show_layout(s, st);
3043 default:
3044 return 0; /* XXX: or SEQ_SKIP? */
3045 }
3046 /* XXX: copy stateids? */
3047 }
3048
3049 static struct seq_operations states_seq_ops = {
3050 .start = states_start,
3051 .next = states_next,
3052 .stop = states_stop,
3053 .show = states_show
3054 };
3055
client_states_open(struct inode * inode,struct file * file)3056 static int client_states_open(struct inode *inode, struct file *file)
3057 {
3058 struct seq_file *s;
3059 struct nfs4_client *clp;
3060 int ret;
3061
3062 clp = get_nfsdfs_clp(inode);
3063 if (!clp)
3064 return -ENXIO;
3065
3066 ret = seq_open(file, &states_seq_ops);
3067 if (ret)
3068 return ret;
3069 s = file->private_data;
3070 s->private = clp;
3071 return 0;
3072 }
3073
client_opens_release(struct inode * inode,struct file * file)3074 static int client_opens_release(struct inode *inode, struct file *file)
3075 {
3076 struct seq_file *m = file->private_data;
3077 struct nfs4_client *clp = m->private;
3078
3079 /* XXX: alternatively, we could get/drop in seq start/stop */
3080 drop_client(clp);
3081 return seq_release(inode, file);
3082 }
3083
3084 static const struct file_operations client_states_fops = {
3085 .open = client_states_open,
3086 .read = seq_read,
3087 .llseek = seq_lseek,
3088 .release = client_opens_release,
3089 };
3090
3091 /*
3092 * Normally we refuse to destroy clients that are in use, but here the
3093 * administrator is telling us to just do it. We also want to wait
3094 * so the caller has a guarantee that the client's locks are gone by
3095 * the time the write returns:
3096 */
force_expire_client(struct nfs4_client * clp)3097 static void force_expire_client(struct nfs4_client *clp)
3098 {
3099 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
3100 bool already_expired;
3101
3102 trace_nfsd_clid_admin_expired(&clp->cl_clientid);
3103
3104 spin_lock(&nn->client_lock);
3105 clp->cl_time = 0;
3106 spin_unlock(&nn->client_lock);
3107
3108 wait_event(expiry_wq, atomic_read(&clp->cl_rpc_users) == 0);
3109 spin_lock(&nn->client_lock);
3110 already_expired = list_empty(&clp->cl_lru);
3111 if (!already_expired)
3112 unhash_client_locked(clp);
3113 spin_unlock(&nn->client_lock);
3114
3115 if (!already_expired)
3116 expire_client(clp);
3117 else
3118 wait_event(expiry_wq, clp->cl_nfsd_dentry == NULL);
3119 }
3120
client_ctl_write(struct file * file,const char __user * buf,size_t size,loff_t * pos)3121 static ssize_t client_ctl_write(struct file *file, const char __user *buf,
3122 size_t size, loff_t *pos)
3123 {
3124 char *data;
3125 struct nfs4_client *clp;
3126
3127 data = simple_transaction_get(file, buf, size);
3128 if (IS_ERR(data))
3129 return PTR_ERR(data);
3130 if (size != 7 || 0 != memcmp(data, "expire\n", 7))
3131 return -EINVAL;
3132 clp = get_nfsdfs_clp(file_inode(file));
3133 if (!clp)
3134 return -ENXIO;
3135 force_expire_client(clp);
3136 drop_client(clp);
3137 return 7;
3138 }
3139
3140 static const struct file_operations client_ctl_fops = {
3141 .write = client_ctl_write,
3142 .release = simple_transaction_release,
3143 };
3144
3145 static const struct tree_descr client_files[] = {
3146 [0] = {"info", &client_info_fops, S_IRUSR},
3147 [1] = {"states", &client_states_fops, S_IRUSR},
3148 [2] = {"ctl", &client_ctl_fops, S_IWUSR},
3149 [3] = {""},
3150 };
3151
3152 static int
nfsd4_cb_recall_any_done(struct nfsd4_callback * cb,struct rpc_task * task)3153 nfsd4_cb_recall_any_done(struct nfsd4_callback *cb,
3154 struct rpc_task *task)
3155 {
3156 trace_nfsd_cb_recall_any_done(cb, task);
3157 switch (task->tk_status) {
3158 case -NFS4ERR_DELAY:
3159 rpc_delay(task, 2 * HZ);
3160 return 0;
3161 default:
3162 return 1;
3163 }
3164 }
3165
3166 static void
nfsd4_cb_recall_any_release(struct nfsd4_callback * cb)3167 nfsd4_cb_recall_any_release(struct nfsd4_callback *cb)
3168 {
3169 struct nfs4_client *clp = cb->cb_clp;
3170
3171 clear_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags);
3172 drop_client(clp);
3173 }
3174
3175 static int
nfsd4_cb_getattr_done(struct nfsd4_callback * cb,struct rpc_task * task)3176 nfsd4_cb_getattr_done(struct nfsd4_callback *cb, struct rpc_task *task)
3177 {
3178 struct nfs4_cb_fattr *ncf =
3179 container_of(cb, struct nfs4_cb_fattr, ncf_getattr);
3180 struct nfs4_delegation *dp =
3181 container_of(ncf, struct nfs4_delegation, dl_cb_fattr);
3182
3183 trace_nfsd_cb_getattr_done(&dp->dl_stid.sc_stateid, task);
3184 ncf->ncf_cb_status = task->tk_status;
3185 switch (task->tk_status) {
3186 case -NFS4ERR_DELAY:
3187 rpc_delay(task, 2 * HZ);
3188 return 0;
3189 default:
3190 return 1;
3191 }
3192 }
3193
3194 static void
nfsd4_cb_getattr_release(struct nfsd4_callback * cb)3195 nfsd4_cb_getattr_release(struct nfsd4_callback *cb)
3196 {
3197 struct nfs4_cb_fattr *ncf =
3198 container_of(cb, struct nfs4_cb_fattr, ncf_getattr);
3199 struct nfs4_delegation *dp =
3200 container_of(ncf, struct nfs4_delegation, dl_cb_fattr);
3201
3202 clear_and_wake_up_bit(CB_GETATTR_BUSY, &ncf->ncf_cb_flags);
3203 nfs4_put_stid(&dp->dl_stid);
3204 }
3205
3206 static const struct nfsd4_callback_ops nfsd4_cb_recall_any_ops = {
3207 .done = nfsd4_cb_recall_any_done,
3208 .release = nfsd4_cb_recall_any_release,
3209 .opcode = OP_CB_RECALL_ANY,
3210 };
3211
3212 static const struct nfsd4_callback_ops nfsd4_cb_getattr_ops = {
3213 .done = nfsd4_cb_getattr_done,
3214 .release = nfsd4_cb_getattr_release,
3215 .opcode = OP_CB_GETATTR,
3216 };
3217
nfs4_cb_getattr(struct nfs4_cb_fattr * ncf)3218 static void nfs4_cb_getattr(struct nfs4_cb_fattr *ncf)
3219 {
3220 struct nfs4_delegation *dp =
3221 container_of(ncf, struct nfs4_delegation, dl_cb_fattr);
3222
3223 if (test_and_set_bit(CB_GETATTR_BUSY, &ncf->ncf_cb_flags))
3224 return;
3225 /* set to proper status when nfsd4_cb_getattr_done runs */
3226 ncf->ncf_cb_status = NFS4ERR_IO;
3227
3228 refcount_inc(&dp->dl_stid.sc_count);
3229 nfsd4_run_cb(&ncf->ncf_getattr);
3230 }
3231
create_client(struct xdr_netobj name,struct svc_rqst * rqstp,nfs4_verifier * verf)3232 static struct nfs4_client *create_client(struct xdr_netobj name,
3233 struct svc_rqst *rqstp, nfs4_verifier *verf)
3234 {
3235 struct nfs4_client *clp;
3236 struct sockaddr *sa = svc_addr(rqstp);
3237 int ret;
3238 struct net *net = SVC_NET(rqstp);
3239 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3240 struct dentry *dentries[ARRAY_SIZE(client_files)];
3241
3242 clp = alloc_client(name, nn);
3243 if (clp == NULL)
3244 return NULL;
3245
3246 ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
3247 if (ret) {
3248 free_client(clp);
3249 return NULL;
3250 }
3251 gen_clid(clp, nn);
3252 kref_init(&clp->cl_nfsdfs.cl_ref);
3253 nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
3254 clp->cl_time = ktime_get_boottime_seconds();
3255 copy_verf(clp, verf);
3256 memcpy(&clp->cl_addr, sa, sizeof(struct sockaddr_storage));
3257 clp->cl_cb_session = NULL;
3258 clp->net = net;
3259 clp->cl_nfsd_dentry = nfsd_client_mkdir(
3260 nn, &clp->cl_nfsdfs,
3261 clp->cl_clientid.cl_id - nn->clientid_base,
3262 client_files, dentries);
3263 clp->cl_nfsd_info_dentry = dentries[0];
3264 if (!clp->cl_nfsd_dentry) {
3265 free_client(clp);
3266 return NULL;
3267 }
3268 clp->cl_ra = kzalloc(sizeof(*clp->cl_ra), GFP_KERNEL);
3269 if (!clp->cl_ra) {
3270 free_client(clp);
3271 return NULL;
3272 }
3273 clp->cl_ra_time = 0;
3274 nfsd4_init_cb(&clp->cl_ra->ra_cb, clp, &nfsd4_cb_recall_any_ops,
3275 NFSPROC4_CLNT_CB_RECALL_ANY);
3276 return clp;
3277 }
3278
3279 static void
add_clp_to_name_tree(struct nfs4_client * new_clp,struct rb_root * root)3280 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
3281 {
3282 struct rb_node **new = &(root->rb_node), *parent = NULL;
3283 struct nfs4_client *clp;
3284
3285 while (*new) {
3286 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
3287 parent = *new;
3288
3289 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
3290 new = &((*new)->rb_left);
3291 else
3292 new = &((*new)->rb_right);
3293 }
3294
3295 rb_link_node(&new_clp->cl_namenode, parent, new);
3296 rb_insert_color(&new_clp->cl_namenode, root);
3297 }
3298
3299 static struct nfs4_client *
find_clp_in_name_tree(struct xdr_netobj * name,struct rb_root * root)3300 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
3301 {
3302 int cmp;
3303 struct rb_node *node = root->rb_node;
3304 struct nfs4_client *clp;
3305
3306 while (node) {
3307 clp = rb_entry(node, struct nfs4_client, cl_namenode);
3308 cmp = compare_blob(&clp->cl_name, name);
3309 if (cmp > 0)
3310 node = node->rb_left;
3311 else if (cmp < 0)
3312 node = node->rb_right;
3313 else
3314 return clp;
3315 }
3316 return NULL;
3317 }
3318
3319 static void
add_to_unconfirmed(struct nfs4_client * clp)3320 add_to_unconfirmed(struct nfs4_client *clp)
3321 {
3322 unsigned int idhashval;
3323 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
3324
3325 lockdep_assert_held(&nn->client_lock);
3326
3327 clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
3328 add_clp_to_name_tree(clp, &nn->unconf_name_tree);
3329 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
3330 list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
3331 renew_client_locked(clp);
3332 }
3333
3334 static void
move_to_confirmed(struct nfs4_client * clp)3335 move_to_confirmed(struct nfs4_client *clp)
3336 {
3337 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
3338 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
3339
3340 lockdep_assert_held(&nn->client_lock);
3341
3342 list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
3343 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
3344 add_clp_to_name_tree(clp, &nn->conf_name_tree);
3345 set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
3346 trace_nfsd_clid_confirmed(&clp->cl_clientid);
3347 renew_client_locked(clp);
3348 }
3349
3350 static struct nfs4_client *
find_client_in_id_table(struct list_head * tbl,clientid_t * clid,bool sessions)3351 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
3352 {
3353 struct nfs4_client *clp;
3354 unsigned int idhashval = clientid_hashval(clid->cl_id);
3355
3356 list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
3357 if (same_clid(&clp->cl_clientid, clid)) {
3358 if ((bool)clp->cl_minorversion != sessions)
3359 return NULL;
3360 renew_client_locked(clp);
3361 return clp;
3362 }
3363 }
3364 return NULL;
3365 }
3366
3367 static struct nfs4_client *
find_confirmed_client(clientid_t * clid,bool sessions,struct nfsd_net * nn)3368 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
3369 {
3370 struct list_head *tbl = nn->conf_id_hashtbl;
3371
3372 lockdep_assert_held(&nn->client_lock);
3373 return find_client_in_id_table(tbl, clid, sessions);
3374 }
3375
3376 static struct nfs4_client *
find_unconfirmed_client(clientid_t * clid,bool sessions,struct nfsd_net * nn)3377 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
3378 {
3379 struct list_head *tbl = nn->unconf_id_hashtbl;
3380
3381 lockdep_assert_held(&nn->client_lock);
3382 return find_client_in_id_table(tbl, clid, sessions);
3383 }
3384
clp_used_exchangeid(struct nfs4_client * clp)3385 static bool clp_used_exchangeid(struct nfs4_client *clp)
3386 {
3387 return clp->cl_exchange_flags != 0;
3388 }
3389
3390 static struct nfs4_client *
find_confirmed_client_by_name(struct xdr_netobj * name,struct nfsd_net * nn)3391 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
3392 {
3393 lockdep_assert_held(&nn->client_lock);
3394 return find_clp_in_name_tree(name, &nn->conf_name_tree);
3395 }
3396
3397 static struct nfs4_client *
find_unconfirmed_client_by_name(struct xdr_netobj * name,struct nfsd_net * nn)3398 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
3399 {
3400 lockdep_assert_held(&nn->client_lock);
3401 return find_clp_in_name_tree(name, &nn->unconf_name_tree);
3402 }
3403
3404 static void
gen_callback(struct nfs4_client * clp,struct nfsd4_setclientid * se,struct svc_rqst * rqstp)3405 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
3406 {
3407 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
3408 struct sockaddr *sa = svc_addr(rqstp);
3409 u32 scopeid = rpc_get_scope_id(sa);
3410 unsigned short expected_family;
3411
3412 /* Currently, we only support tcp and tcp6 for the callback channel */
3413 if (se->se_callback_netid_len == 3 &&
3414 !memcmp(se->se_callback_netid_val, "tcp", 3))
3415 expected_family = AF_INET;
3416 else if (se->se_callback_netid_len == 4 &&
3417 !memcmp(se->se_callback_netid_val, "tcp6", 4))
3418 expected_family = AF_INET6;
3419 else
3420 goto out_err;
3421
3422 conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
3423 se->se_callback_addr_len,
3424 (struct sockaddr *)&conn->cb_addr,
3425 sizeof(conn->cb_addr));
3426
3427 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
3428 goto out_err;
3429
3430 if (conn->cb_addr.ss_family == AF_INET6)
3431 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
3432
3433 conn->cb_prog = se->se_callback_prog;
3434 conn->cb_ident = se->se_callback_ident;
3435 memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
3436 trace_nfsd_cb_args(clp, conn);
3437 return;
3438 out_err:
3439 conn->cb_addr.ss_family = AF_UNSPEC;
3440 conn->cb_addrlen = 0;
3441 trace_nfsd_cb_nodelegs(clp);
3442 return;
3443 }
3444
3445 /*
3446 * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
3447 */
3448 static void
nfsd4_store_cache_entry(struct nfsd4_compoundres * resp)3449 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
3450 {
3451 struct xdr_buf *buf = resp->xdr->buf;
3452 struct nfsd4_slot *slot = resp->cstate.slot;
3453 unsigned int base;
3454
3455 dprintk("--> %s slot %p\n", __func__, slot);
3456
3457 slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
3458 slot->sl_opcnt = resp->opcnt;
3459 slot->sl_status = resp->cstate.status;
3460 free_svc_cred(&slot->sl_cred);
3461 copy_cred(&slot->sl_cred, &resp->rqstp->rq_cred);
3462
3463 if (!nfsd4_cache_this(resp)) {
3464 slot->sl_flags &= ~NFSD4_SLOT_CACHED;
3465 return;
3466 }
3467 slot->sl_flags |= NFSD4_SLOT_CACHED;
3468
3469 base = resp->cstate.data_offset;
3470 slot->sl_datalen = buf->len - base;
3471 if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
3472 WARN(1, "%s: sessions DRC could not cache compound\n",
3473 __func__);
3474 return;
3475 }
3476
3477 /*
3478 * Encode the replay sequence operation from the slot values.
3479 * If cachethis is FALSE encode the uncached rep error on the next
3480 * operation which sets resp->p and increments resp->opcnt for
3481 * nfs4svc_encode_compoundres.
3482 *
3483 */
3484 static __be32
nfsd4_enc_sequence_replay(struct nfsd4_compoundargs * args,struct nfsd4_compoundres * resp)3485 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
3486 struct nfsd4_compoundres *resp)
3487 {
3488 struct nfsd4_op *op;
3489 struct nfsd4_slot *slot = resp->cstate.slot;
3490
3491 /* Encode the replayed sequence operation */
3492 op = &args->ops[resp->opcnt - 1];
3493 nfsd4_encode_operation(resp, op);
3494
3495 if (slot->sl_flags & NFSD4_SLOT_CACHED)
3496 return op->status;
3497 if (args->opcnt == 1) {
3498 /*
3499 * The original operation wasn't a solo sequence--we
3500 * always cache those--so this retry must not match the
3501 * original:
3502 */
3503 op->status = nfserr_seq_false_retry;
3504 } else {
3505 op = &args->ops[resp->opcnt++];
3506 op->status = nfserr_retry_uncached_rep;
3507 nfsd4_encode_operation(resp, op);
3508 }
3509 return op->status;
3510 }
3511
3512 /*
3513 * The sequence operation is not cached because we can use the slot and
3514 * session values.
3515 */
3516 static __be32
nfsd4_replay_cache_entry(struct nfsd4_compoundres * resp,struct nfsd4_sequence * seq)3517 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
3518 struct nfsd4_sequence *seq)
3519 {
3520 struct nfsd4_slot *slot = resp->cstate.slot;
3521 struct xdr_stream *xdr = resp->xdr;
3522 __be32 *p;
3523 __be32 status;
3524
3525 dprintk("--> %s slot %p\n", __func__, slot);
3526
3527 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
3528 if (status)
3529 return status;
3530
3531 p = xdr_reserve_space(xdr, slot->sl_datalen);
3532 if (!p) {
3533 WARN_ON_ONCE(1);
3534 return nfserr_serverfault;
3535 }
3536 xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
3537 xdr_commit_encode(xdr);
3538
3539 resp->opcnt = slot->sl_opcnt;
3540 return slot->sl_status;
3541 }
3542
3543 /*
3544 * Set the exchange_id flags returned by the server.
3545 */
3546 static void
nfsd4_set_ex_flags(struct nfs4_client * new,struct nfsd4_exchange_id * clid)3547 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
3548 {
3549 #ifdef CONFIG_NFSD_PNFS
3550 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
3551 #else
3552 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
3553 #endif
3554
3555 /* Referrals are supported, Migration is not. */
3556 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
3557
3558 /* set the wire flags to return to client. */
3559 clid->flags = new->cl_exchange_flags;
3560 }
3561
client_has_openowners(struct nfs4_client * clp)3562 static bool client_has_openowners(struct nfs4_client *clp)
3563 {
3564 struct nfs4_openowner *oo;
3565
3566 list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
3567 if (!list_empty(&oo->oo_owner.so_stateids))
3568 return true;
3569 }
3570 return false;
3571 }
3572
client_has_state(struct nfs4_client * clp)3573 static bool client_has_state(struct nfs4_client *clp)
3574 {
3575 return client_has_openowners(clp)
3576 #ifdef CONFIG_NFSD_PNFS
3577 || !list_empty(&clp->cl_lo_states)
3578 #endif
3579 || !list_empty(&clp->cl_delegations)
3580 || !list_empty(&clp->cl_sessions)
3581 || nfsd4_has_active_async_copies(clp);
3582 }
3583
copy_impl_id(struct nfs4_client * clp,struct nfsd4_exchange_id * exid)3584 static __be32 copy_impl_id(struct nfs4_client *clp,
3585 struct nfsd4_exchange_id *exid)
3586 {
3587 if (!exid->nii_domain.data)
3588 return 0;
3589 xdr_netobj_dup(&clp->cl_nii_domain, &exid->nii_domain, GFP_KERNEL);
3590 if (!clp->cl_nii_domain.data)
3591 return nfserr_jukebox;
3592 xdr_netobj_dup(&clp->cl_nii_name, &exid->nii_name, GFP_KERNEL);
3593 if (!clp->cl_nii_name.data)
3594 return nfserr_jukebox;
3595 clp->cl_nii_time = exid->nii_time;
3596 return 0;
3597 }
3598
3599 __be32
nfsd4_exchange_id(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3600 nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3601 union nfsd4_op_u *u)
3602 {
3603 struct nfsd4_exchange_id *exid = &u->exchange_id;
3604 struct nfs4_client *conf, *new;
3605 struct nfs4_client *unconf = NULL;
3606 __be32 status;
3607 char addr_str[INET6_ADDRSTRLEN];
3608 nfs4_verifier verf = exid->verifier;
3609 struct sockaddr *sa = svc_addr(rqstp);
3610 bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
3611 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3612
3613 rpc_ntop(sa, addr_str, sizeof(addr_str));
3614 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
3615 "ip_addr=%s flags %x, spa_how %u\n",
3616 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
3617 addr_str, exid->flags, exid->spa_how);
3618
3619 exid->server_impl_name = kasprintf(GFP_KERNEL, "%s %s %s %s",
3620 utsname()->sysname, utsname()->release,
3621 utsname()->version, utsname()->machine);
3622 if (!exid->server_impl_name)
3623 return nfserr_jukebox;
3624
3625 if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
3626 return nfserr_inval;
3627
3628 new = create_client(exid->clname, rqstp, &verf);
3629 if (new == NULL)
3630 return nfserr_jukebox;
3631 status = copy_impl_id(new, exid);
3632 if (status)
3633 goto out_nolock;
3634
3635 switch (exid->spa_how) {
3636 case SP4_MACH_CRED:
3637 exid->spo_must_enforce[0] = 0;
3638 exid->spo_must_enforce[1] = (
3639 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3640 1 << (OP_EXCHANGE_ID - 32) |
3641 1 << (OP_CREATE_SESSION - 32) |
3642 1 << (OP_DESTROY_SESSION - 32) |
3643 1 << (OP_DESTROY_CLIENTID - 32));
3644
3645 exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
3646 1 << (OP_OPEN_DOWNGRADE) |
3647 1 << (OP_LOCKU) |
3648 1 << (OP_DELEGRETURN));
3649
3650 exid->spo_must_allow[1] &= (
3651 1 << (OP_TEST_STATEID - 32) |
3652 1 << (OP_FREE_STATEID - 32));
3653 if (!svc_rqst_integrity_protected(rqstp)) {
3654 status = nfserr_inval;
3655 goto out_nolock;
3656 }
3657 /*
3658 * Sometimes userspace doesn't give us a principal.
3659 * Which is a bug, really. Anyway, we can't enforce
3660 * MACH_CRED in that case, better to give up now:
3661 */
3662 if (!new->cl_cred.cr_principal &&
3663 !new->cl_cred.cr_raw_principal) {
3664 status = nfserr_serverfault;
3665 goto out_nolock;
3666 }
3667 new->cl_mach_cred = true;
3668 break;
3669 case SP4_NONE:
3670 break;
3671 default: /* checked by xdr code */
3672 WARN_ON_ONCE(1);
3673 fallthrough;
3674 case SP4_SSV:
3675 status = nfserr_encr_alg_unsupp;
3676 goto out_nolock;
3677 }
3678
3679 /* Cases below refer to rfc 5661 section 18.35.4: */
3680 spin_lock(&nn->client_lock);
3681 conf = find_confirmed_client_by_name(&exid->clname, nn);
3682 if (conf) {
3683 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
3684 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
3685
3686 if (update) {
3687 if (!clp_used_exchangeid(conf)) { /* buggy client */
3688 status = nfserr_inval;
3689 goto out;
3690 }
3691 if (!nfsd4_mach_creds_match(conf, rqstp)) {
3692 status = nfserr_wrong_cred;
3693 goto out;
3694 }
3695 if (!creds_match) { /* case 9 */
3696 status = nfserr_perm;
3697 goto out;
3698 }
3699 if (!verfs_match) { /* case 8 */
3700 status = nfserr_not_same;
3701 goto out;
3702 }
3703 /* case 6 */
3704 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
3705 trace_nfsd_clid_confirmed_r(conf);
3706 goto out_copy;
3707 }
3708 if (!creds_match) { /* case 3 */
3709 if (client_has_state(conf)) {
3710 status = nfserr_clid_inuse;
3711 trace_nfsd_clid_cred_mismatch(conf, rqstp);
3712 goto out;
3713 }
3714 goto out_new;
3715 }
3716 if (verfs_match) { /* case 2 */
3717 conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
3718 trace_nfsd_clid_confirmed_r(conf);
3719 goto out_copy;
3720 }
3721 /* case 5, client reboot */
3722 trace_nfsd_clid_verf_mismatch(conf, rqstp, &verf);
3723 conf = NULL;
3724 goto out_new;
3725 }
3726
3727 if (update) { /* case 7 */
3728 status = nfserr_noent;
3729 goto out;
3730 }
3731
3732 unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
3733 if (unconf) /* case 4, possible retry or client restart */
3734 unhash_client_locked(unconf);
3735
3736 /* case 1, new owner ID */
3737 trace_nfsd_clid_fresh(new);
3738
3739 out_new:
3740 if (conf) {
3741 status = mark_client_expired_locked(conf);
3742 if (status)
3743 goto out;
3744 trace_nfsd_clid_replaced(&conf->cl_clientid);
3745 }
3746 new->cl_minorversion = cstate->minorversion;
3747 new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
3748 new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
3749
3750 /* Contrived initial CREATE_SESSION response */
3751 new->cl_cs_slot.sl_status = nfserr_seq_misordered;
3752
3753 add_to_unconfirmed(new);
3754 swap(new, conf);
3755 out_copy:
3756 exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
3757 exid->clientid.cl_id = conf->cl_clientid.cl_id;
3758
3759 exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
3760 nfsd4_set_ex_flags(conf, exid);
3761
3762 exid->nii_domain.len = sizeof("kernel.org") - 1;
3763 exid->nii_domain.data = "kernel.org";
3764
3765 /*
3766 * Note that RFC 8881 places no length limit on
3767 * nii_name, but this implementation permits no
3768 * more than NFS4_OPAQUE_LIMIT bytes.
3769 */
3770 exid->nii_name.len = strlen(exid->server_impl_name);
3771 if (exid->nii_name.len > NFS4_OPAQUE_LIMIT)
3772 exid->nii_name.len = NFS4_OPAQUE_LIMIT;
3773 exid->nii_name.data = exid->server_impl_name;
3774
3775 /* just send zeros - the date is in nii_name */
3776 exid->nii_time.tv_sec = 0;
3777 exid->nii_time.tv_nsec = 0;
3778
3779 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
3780 conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
3781 status = nfs_ok;
3782
3783 out:
3784 spin_unlock(&nn->client_lock);
3785 out_nolock:
3786 if (new)
3787 expire_client(new);
3788 if (unconf) {
3789 trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
3790 expire_client(unconf);
3791 }
3792 return status;
3793 }
3794
3795 void
nfsd4_exchange_id_release(union nfsd4_op_u * u)3796 nfsd4_exchange_id_release(union nfsd4_op_u *u)
3797 {
3798 struct nfsd4_exchange_id *exid = &u->exchange_id;
3799
3800 kfree(exid->server_impl_name);
3801 }
3802
check_slot_seqid(u32 seqid,u32 slot_seqid,u8 flags)3803 static __be32 check_slot_seqid(u32 seqid, u32 slot_seqid, u8 flags)
3804 {
3805 /* The slot is in use, and no response has been sent. */
3806 if (flags & NFSD4_SLOT_INUSE) {
3807 if (seqid == slot_seqid)
3808 return nfserr_jukebox;
3809 else
3810 return nfserr_seq_misordered;
3811 }
3812 /* Note unsigned 32-bit arithmetic handles wraparound: */
3813 if (likely(seqid == slot_seqid + 1))
3814 return nfs_ok;
3815 if ((flags & NFSD4_SLOT_REUSED) && seqid == 1)
3816 return nfs_ok;
3817 if (seqid == slot_seqid)
3818 return nfserr_replay_cache;
3819 return nfserr_seq_misordered;
3820 }
3821
3822 /*
3823 * Cache the create session result into the create session single DRC
3824 * slot cache by saving the xdr structure. sl_seqid has been set.
3825 * Do this for solo or embedded create session operations.
3826 */
3827 static void
nfsd4_cache_create_session(struct nfsd4_create_session * cr_ses,struct nfsd4_clid_slot * slot,__be32 nfserr)3828 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
3829 struct nfsd4_clid_slot *slot, __be32 nfserr)
3830 {
3831 slot->sl_status = nfserr;
3832 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
3833 }
3834
3835 static __be32
nfsd4_replay_create_session(struct nfsd4_create_session * cr_ses,struct nfsd4_clid_slot * slot)3836 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
3837 struct nfsd4_clid_slot *slot)
3838 {
3839 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
3840 return slot->sl_status;
3841 }
3842
3843 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
3844 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
3845 1 + /* MIN tag is length with zero, only length */ \
3846 3 + /* version, opcount, opcode */ \
3847 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3848 /* seqid, slotID, slotID, cache */ \
3849 4 ) * sizeof(__be32))
3850
3851 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
3852 2 + /* verifier: AUTH_NULL, length 0 */\
3853 1 + /* status */ \
3854 1 + /* MIN tag is length with zero, only length */ \
3855 3 + /* opcount, opcode, opstatus*/ \
3856 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3857 /* seqid, slotID, slotID, slotID, status */ \
3858 5 ) * sizeof(__be32))
3859
check_forechannel_attrs(struct nfsd4_channel_attrs * ca,struct nfsd_net * nn)3860 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
3861 {
3862 u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
3863
3864 if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
3865 return nfserr_toosmall;
3866 if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
3867 return nfserr_toosmall;
3868 ca->headerpadsz = 0;
3869 ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
3870 ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
3871 ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
3872 ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
3873 NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
3874 ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
3875
3876 return nfs_ok;
3877 }
3878
3879 /*
3880 * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
3881 * These are based on similar macros in linux/sunrpc/msg_prot.h .
3882 */
3883 #define RPC_MAX_HEADER_WITH_AUTH_SYS \
3884 (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
3885
3886 #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
3887 (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
3888
3889 #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
3890 RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
3891 #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
3892 RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
3893 sizeof(__be32))
3894
check_backchannel_attrs(struct nfsd4_channel_attrs * ca)3895 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
3896 {
3897 ca->headerpadsz = 0;
3898
3899 if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
3900 return nfserr_toosmall;
3901 if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
3902 return nfserr_toosmall;
3903 ca->maxresp_cached = 0;
3904 if (ca->maxops < 2)
3905 return nfserr_toosmall;
3906
3907 return nfs_ok;
3908 }
3909
nfsd4_check_cb_sec(struct nfsd4_cb_sec * cbs)3910 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
3911 {
3912 switch (cbs->flavor) {
3913 case RPC_AUTH_NULL:
3914 case RPC_AUTH_UNIX:
3915 return nfs_ok;
3916 default:
3917 /*
3918 * GSS case: the spec doesn't allow us to return this
3919 * error. But it also doesn't allow us not to support
3920 * GSS.
3921 * I'd rather this fail hard than return some error the
3922 * client might think it can already handle:
3923 */
3924 return nfserr_encr_alg_unsupp;
3925 }
3926 }
3927
3928 __be32
nfsd4_create_session(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3929 nfsd4_create_session(struct svc_rqst *rqstp,
3930 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
3931 {
3932 struct nfsd4_create_session *cr_ses = &u->create_session;
3933 struct sockaddr *sa = svc_addr(rqstp);
3934 struct nfs4_client *conf, *unconf;
3935 struct nfsd4_clid_slot *cs_slot;
3936 struct nfs4_client *old = NULL;
3937 struct nfsd4_session *new;
3938 struct nfsd4_conn *conn;
3939 __be32 status = 0;
3940 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3941
3942 if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
3943 return nfserr_inval;
3944 status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
3945 if (status)
3946 return status;
3947 status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
3948 if (status)
3949 return status;
3950 status = check_backchannel_attrs(&cr_ses->back_channel);
3951 if (status)
3952 goto out_err;
3953 status = nfserr_jukebox;
3954 new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
3955 if (!new)
3956 goto out_err;
3957 conn = alloc_conn_from_crses(rqstp, cr_ses);
3958 if (!conn)
3959 goto out_free_session;
3960
3961 spin_lock(&nn->client_lock);
3962
3963 /* RFC 8881 Section 18.36.4 Phase 1: Client record look-up. */
3964 unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
3965 conf = find_confirmed_client(&cr_ses->clientid, true, nn);
3966 if (!conf && !unconf) {
3967 status = nfserr_stale_clientid;
3968 goto out_free_conn;
3969 }
3970
3971 /* RFC 8881 Section 18.36.4 Phase 2: Sequence ID processing. */
3972 if (conf) {
3973 cs_slot = &conf->cl_cs_slot;
3974 trace_nfsd_slot_seqid_conf(conf, cr_ses);
3975 } else {
3976 cs_slot = &unconf->cl_cs_slot;
3977 trace_nfsd_slot_seqid_unconf(unconf, cr_ses);
3978 }
3979 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
3980 switch (status) {
3981 case nfs_ok:
3982 cs_slot->sl_seqid++;
3983 cr_ses->seqid = cs_slot->sl_seqid;
3984 break;
3985 case nfserr_replay_cache:
3986 status = nfsd4_replay_create_session(cr_ses, cs_slot);
3987 fallthrough;
3988 case nfserr_jukebox:
3989 /* The server MUST NOT cache NFS4ERR_DELAY */
3990 goto out_free_conn;
3991 default:
3992 goto out_cache_error;
3993 }
3994
3995 /* RFC 8881 Section 18.36.4 Phase 3: Client ID confirmation. */
3996 if (conf) {
3997 status = nfserr_wrong_cred;
3998 if (!nfsd4_mach_creds_match(conf, rqstp))
3999 goto out_cache_error;
4000 } else {
4001 status = nfserr_clid_inuse;
4002 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
4003 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
4004 trace_nfsd_clid_cred_mismatch(unconf, rqstp);
4005 goto out_cache_error;
4006 }
4007 status = nfserr_wrong_cred;
4008 if (!nfsd4_mach_creds_match(unconf, rqstp))
4009 goto out_cache_error;
4010 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
4011 if (old) {
4012 status = mark_client_expired_locked(old);
4013 if (status)
4014 goto out_expired_error;
4015 trace_nfsd_clid_replaced(&old->cl_clientid);
4016 }
4017 move_to_confirmed(unconf);
4018 conf = unconf;
4019 }
4020
4021 /* RFC 8881 Section 18.36.4 Phase 4: Session creation. */
4022 status = nfs_ok;
4023 /* Persistent sessions are not supported */
4024 cr_ses->flags &= ~SESSION4_PERSIST;
4025 /* Upshifting from TCP to RDMA is not supported */
4026 cr_ses->flags &= ~SESSION4_RDMA;
4027 /* Report the correct number of backchannel slots */
4028 cr_ses->back_channel.maxreqs = new->se_cb_highest_slot + 1;
4029
4030 init_session(rqstp, new, conf, cr_ses);
4031 nfsd4_get_session_locked(new);
4032
4033 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
4034 NFS4_MAX_SESSIONID_LEN);
4035
4036 /* cache solo and embedded create sessions under the client_lock */
4037 nfsd4_cache_create_session(cr_ses, cs_slot, status);
4038 spin_unlock(&nn->client_lock);
4039 if (conf == unconf)
4040 fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY);
4041 /* init connection and backchannel */
4042 nfsd4_init_conn(rqstp, conn, new);
4043 nfsd4_put_session(new);
4044 if (old)
4045 expire_client(old);
4046 return status;
4047
4048 out_expired_error:
4049 /*
4050 * Revert the slot seq_nr change so the server will process
4051 * the client's resend instead of returning a cached response.
4052 */
4053 if (status == nfserr_jukebox) {
4054 cs_slot->sl_seqid--;
4055 cr_ses->seqid = cs_slot->sl_seqid;
4056 goto out_free_conn;
4057 }
4058 out_cache_error:
4059 nfsd4_cache_create_session(cr_ses, cs_slot, status);
4060 out_free_conn:
4061 spin_unlock(&nn->client_lock);
4062 free_conn(conn);
4063 out_free_session:
4064 __free_session(new);
4065 out_err:
4066 return status;
4067 }
4068
nfsd4_map_bcts_dir(u32 * dir)4069 static __be32 nfsd4_map_bcts_dir(u32 *dir)
4070 {
4071 switch (*dir) {
4072 case NFS4_CDFC4_FORE:
4073 case NFS4_CDFC4_BACK:
4074 return nfs_ok;
4075 case NFS4_CDFC4_FORE_OR_BOTH:
4076 case NFS4_CDFC4_BACK_OR_BOTH:
4077 *dir = NFS4_CDFC4_BOTH;
4078 return nfs_ok;
4079 }
4080 return nfserr_inval;
4081 }
4082
nfsd4_backchannel_ctl(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4083 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp,
4084 struct nfsd4_compound_state *cstate,
4085 union nfsd4_op_u *u)
4086 {
4087 struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
4088 struct nfsd4_session *session = cstate->session;
4089 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4090 __be32 status;
4091
4092 status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
4093 if (status)
4094 return status;
4095 spin_lock(&nn->client_lock);
4096 session->se_cb_prog = bc->bc_cb_program;
4097 session->se_cb_sec = bc->bc_cb_sec;
4098 spin_unlock(&nn->client_lock);
4099
4100 nfsd4_probe_callback(session->se_client);
4101
4102 return nfs_ok;
4103 }
4104
__nfsd4_find_conn(struct svc_xprt * xpt,struct nfsd4_session * s)4105 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
4106 {
4107 struct nfsd4_conn *c;
4108
4109 list_for_each_entry(c, &s->se_conns, cn_persession) {
4110 if (c->cn_xprt == xpt) {
4111 return c;
4112 }
4113 }
4114 return NULL;
4115 }
4116
nfsd4_match_existing_connection(struct svc_rqst * rqst,struct nfsd4_session * session,u32 req,struct nfsd4_conn ** conn)4117 static __be32 nfsd4_match_existing_connection(struct svc_rqst *rqst,
4118 struct nfsd4_session *session, u32 req, struct nfsd4_conn **conn)
4119 {
4120 struct nfs4_client *clp = session->se_client;
4121 struct svc_xprt *xpt = rqst->rq_xprt;
4122 struct nfsd4_conn *c;
4123 __be32 status;
4124
4125 /* Following the last paragraph of RFC 5661 Section 18.34.3: */
4126 spin_lock(&clp->cl_lock);
4127 c = __nfsd4_find_conn(xpt, session);
4128 if (!c)
4129 status = nfserr_noent;
4130 else if (req == c->cn_flags)
4131 status = nfs_ok;
4132 else if (req == NFS4_CDFC4_FORE_OR_BOTH &&
4133 c->cn_flags != NFS4_CDFC4_BACK)
4134 status = nfs_ok;
4135 else if (req == NFS4_CDFC4_BACK_OR_BOTH &&
4136 c->cn_flags != NFS4_CDFC4_FORE)
4137 status = nfs_ok;
4138 else
4139 status = nfserr_inval;
4140 spin_unlock(&clp->cl_lock);
4141 if (status == nfs_ok && conn)
4142 *conn = c;
4143 return status;
4144 }
4145
nfsd4_bind_conn_to_session(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4146 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
4147 struct nfsd4_compound_state *cstate,
4148 union nfsd4_op_u *u)
4149 {
4150 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
4151 __be32 status;
4152 struct nfsd4_conn *conn;
4153 struct nfsd4_session *session;
4154 struct net *net = SVC_NET(rqstp);
4155 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4156
4157 if (!nfsd4_last_compound_op(rqstp))
4158 return nfserr_not_only_op;
4159 spin_lock(&nn->client_lock);
4160 session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
4161 spin_unlock(&nn->client_lock);
4162 if (!session)
4163 goto out_no_session;
4164 status = nfserr_wrong_cred;
4165 if (!nfsd4_mach_creds_match(session->se_client, rqstp))
4166 goto out;
4167 status = nfsd4_match_existing_connection(rqstp, session,
4168 bcts->dir, &conn);
4169 if (status == nfs_ok) {
4170 if (bcts->dir == NFS4_CDFC4_FORE_OR_BOTH ||
4171 bcts->dir == NFS4_CDFC4_BACK)
4172 conn->cn_flags |= NFS4_CDFC4_BACK;
4173 nfsd4_probe_callback(session->se_client);
4174 goto out;
4175 }
4176 if (status == nfserr_inval)
4177 goto out;
4178 status = nfsd4_map_bcts_dir(&bcts->dir);
4179 if (status)
4180 goto out;
4181 conn = alloc_conn(rqstp, bcts->dir);
4182 status = nfserr_jukebox;
4183 if (!conn)
4184 goto out;
4185 nfsd4_init_conn(rqstp, conn, session);
4186 status = nfs_ok;
4187 out:
4188 nfsd4_put_session(session);
4189 out_no_session:
4190 return status;
4191 }
4192
nfsd4_compound_in_session(struct nfsd4_compound_state * cstate,struct nfs4_sessionid * sid)4193 static bool nfsd4_compound_in_session(struct nfsd4_compound_state *cstate, struct nfs4_sessionid *sid)
4194 {
4195 if (!cstate->session)
4196 return false;
4197 return !memcmp(sid, &cstate->session->se_sessionid, sizeof(*sid));
4198 }
4199
4200 __be32
nfsd4_destroy_session(struct svc_rqst * r,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4201 nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate,
4202 union nfsd4_op_u *u)
4203 {
4204 struct nfs4_sessionid *sessionid = &u->destroy_session.sessionid;
4205 struct nfsd4_session *ses;
4206 __be32 status;
4207 int ref_held_by_me = 0;
4208 struct net *net = SVC_NET(r);
4209 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4210
4211 status = nfserr_not_only_op;
4212 if (nfsd4_compound_in_session(cstate, sessionid)) {
4213 if (!nfsd4_last_compound_op(r))
4214 goto out;
4215 ref_held_by_me++;
4216 }
4217 dump_sessionid(__func__, sessionid);
4218 spin_lock(&nn->client_lock);
4219 ses = find_in_sessionid_hashtbl(sessionid, net, &status);
4220 if (!ses)
4221 goto out_client_lock;
4222 status = nfserr_wrong_cred;
4223 if (!nfsd4_mach_creds_match(ses->se_client, r))
4224 goto out_put_session;
4225 status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
4226 if (status)
4227 goto out_put_session;
4228 unhash_session(ses);
4229 spin_unlock(&nn->client_lock);
4230
4231 nfsd4_probe_callback_sync(ses->se_client);
4232
4233 spin_lock(&nn->client_lock);
4234 status = nfs_ok;
4235 out_put_session:
4236 nfsd4_put_session_locked(ses);
4237 out_client_lock:
4238 spin_unlock(&nn->client_lock);
4239 out:
4240 return status;
4241 }
4242
nfsd4_sequence_check_conn(struct nfsd4_conn * new,struct nfsd4_session * ses)4243 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
4244 {
4245 struct nfs4_client *clp = ses->se_client;
4246 struct nfsd4_conn *c;
4247 __be32 status = nfs_ok;
4248 int ret;
4249
4250 spin_lock(&clp->cl_lock);
4251 c = __nfsd4_find_conn(new->cn_xprt, ses);
4252 if (c)
4253 goto out_free;
4254 status = nfserr_conn_not_bound_to_session;
4255 if (clp->cl_mach_cred)
4256 goto out_free;
4257 __nfsd4_hash_conn(new, ses);
4258 spin_unlock(&clp->cl_lock);
4259 ret = nfsd4_register_conn(new);
4260 if (ret)
4261 /* oops; xprt is already down: */
4262 nfsd4_conn_lost(&new->cn_xpt_user);
4263 return nfs_ok;
4264 out_free:
4265 spin_unlock(&clp->cl_lock);
4266 free_conn(new);
4267 return status;
4268 }
4269
nfsd4_session_too_many_ops(struct svc_rqst * rqstp,struct nfsd4_session * session)4270 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
4271 {
4272 struct nfsd4_compoundargs *args = rqstp->rq_argp;
4273
4274 return args->opcnt > session->se_fchannel.maxops;
4275 }
4276
nfsd4_request_too_big(struct svc_rqst * rqstp,struct nfsd4_session * session)4277 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
4278 struct nfsd4_session *session)
4279 {
4280 struct xdr_buf *xb = &rqstp->rq_arg;
4281
4282 return xb->len > session->se_fchannel.maxreq_sz;
4283 }
4284
replay_matches_cache(struct svc_rqst * rqstp,struct nfsd4_sequence * seq,struct nfsd4_slot * slot)4285 static bool replay_matches_cache(struct svc_rqst *rqstp,
4286 struct nfsd4_sequence *seq, struct nfsd4_slot *slot)
4287 {
4288 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
4289
4290 if ((bool)(slot->sl_flags & NFSD4_SLOT_CACHETHIS) !=
4291 (bool)seq->cachethis)
4292 return false;
4293 /*
4294 * If there's an error then the reply can have fewer ops than
4295 * the call.
4296 */
4297 if (slot->sl_opcnt < argp->opcnt && !slot->sl_status)
4298 return false;
4299 /*
4300 * But if we cached a reply with *more* ops than the call you're
4301 * sending us now, then this new call is clearly not really a
4302 * replay of the old one:
4303 */
4304 if (slot->sl_opcnt > argp->opcnt)
4305 return false;
4306 /* This is the only check explicitly called by spec: */
4307 if (!same_creds(&rqstp->rq_cred, &slot->sl_cred))
4308 return false;
4309 /*
4310 * There may be more comparisons we could actually do, but the
4311 * spec doesn't require us to catch every case where the calls
4312 * don't match (that would require caching the call as well as
4313 * the reply), so we don't bother.
4314 */
4315 return true;
4316 }
4317
4318 __be32
nfsd4_sequence(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4319 nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4320 union nfsd4_op_u *u)
4321 {
4322 struct nfsd4_sequence *seq = &u->sequence;
4323 struct nfsd4_compoundres *resp = rqstp->rq_resp;
4324 struct xdr_stream *xdr = resp->xdr;
4325 struct nfsd4_session *session;
4326 struct nfs4_client *clp;
4327 struct nfsd4_slot *slot;
4328 struct nfsd4_conn *conn;
4329 __be32 status;
4330 int buflen;
4331 struct net *net = SVC_NET(rqstp);
4332 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4333
4334 if (resp->opcnt != 1)
4335 return nfserr_sequence_pos;
4336
4337 /*
4338 * Will be either used or freed by nfsd4_sequence_check_conn
4339 * below.
4340 */
4341 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
4342 if (!conn)
4343 return nfserr_jukebox;
4344
4345 spin_lock(&nn->client_lock);
4346 session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
4347 if (!session)
4348 goto out_no_session;
4349 clp = session->se_client;
4350
4351 status = nfserr_too_many_ops;
4352 if (nfsd4_session_too_many_ops(rqstp, session))
4353 goto out_put_session;
4354
4355 status = nfserr_req_too_big;
4356 if (nfsd4_request_too_big(rqstp, session))
4357 goto out_put_session;
4358
4359 status = nfserr_badslot;
4360 if (seq->slotid >= session->se_fchannel.maxreqs)
4361 goto out_put_session;
4362
4363 slot = xa_load(&session->se_slots, seq->slotid);
4364 dprintk("%s: slotid %d\n", __func__, seq->slotid);
4365
4366 trace_nfsd_slot_seqid_sequence(clp, seq, slot);
4367 status = check_slot_seqid(seq->seqid, slot->sl_seqid, slot->sl_flags);
4368 if (status == nfserr_replay_cache) {
4369 status = nfserr_seq_misordered;
4370 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
4371 goto out_put_session;
4372 status = nfserr_seq_false_retry;
4373 if (!replay_matches_cache(rqstp, seq, slot))
4374 goto out_put_session;
4375 cstate->slot = slot;
4376 cstate->session = session;
4377 cstate->clp = clp;
4378 /* Return the cached reply status and set cstate->status
4379 * for nfsd4_proc_compound processing */
4380 status = nfsd4_replay_cache_entry(resp, seq);
4381 cstate->status = nfserr_replay_cache;
4382 goto out;
4383 }
4384 if (status)
4385 goto out_put_session;
4386
4387 status = nfsd4_sequence_check_conn(conn, session);
4388 conn = NULL;
4389 if (status)
4390 goto out_put_session;
4391
4392 if (session->se_target_maxslots < session->se_fchannel.maxreqs &&
4393 slot->sl_generation == session->se_slot_gen &&
4394 seq->maxslots <= session->se_target_maxslots)
4395 /* Client acknowledged our reduce maxreqs */
4396 free_session_slots(session, session->se_target_maxslots);
4397
4398 buflen = (seq->cachethis) ?
4399 session->se_fchannel.maxresp_cached :
4400 session->se_fchannel.maxresp_sz;
4401 status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
4402 nfserr_rep_too_big;
4403 if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
4404 goto out_put_session;
4405 svc_reserve(rqstp, buflen);
4406
4407 status = nfs_ok;
4408 /* Success! accept new slot seqid */
4409 slot->sl_seqid = seq->seqid;
4410 slot->sl_flags &= ~NFSD4_SLOT_REUSED;
4411 slot->sl_flags |= NFSD4_SLOT_INUSE;
4412 slot->sl_generation = session->se_slot_gen;
4413 if (seq->cachethis)
4414 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
4415 else
4416 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
4417
4418 cstate->slot = slot;
4419 cstate->session = session;
4420 cstate->clp = clp;
4421
4422 /*
4423 * If the client ever uses the highest available slot,
4424 * gently try to allocate another 20%. This allows
4425 * fairly quick growth without grossly over-shooting what
4426 * the client might use.
4427 */
4428 if (seq->slotid == session->se_fchannel.maxreqs - 1 &&
4429 session->se_target_maxslots >= session->se_fchannel.maxreqs &&
4430 session->se_fchannel.maxreqs < NFSD_MAX_SLOTS_PER_SESSION) {
4431 int s = session->se_fchannel.maxreqs;
4432 int cnt = DIV_ROUND_UP(s, 5);
4433 void *prev_slot;
4434
4435 do {
4436 /*
4437 * GFP_NOWAIT both allows allocation under a
4438 * spinlock, and only succeeds if there is
4439 * plenty of memory.
4440 */
4441 slot = kzalloc(slot_bytes(&session->se_fchannel),
4442 GFP_NOWAIT);
4443 prev_slot = xa_load(&session->se_slots, s);
4444 if (xa_is_value(prev_slot) && slot) {
4445 slot->sl_seqid = xa_to_value(prev_slot);
4446 slot->sl_flags |= NFSD4_SLOT_REUSED;
4447 }
4448 if (slot &&
4449 !xa_is_err(xa_store(&session->se_slots, s, slot,
4450 GFP_NOWAIT))) {
4451 s += 1;
4452 session->se_fchannel.maxreqs = s;
4453 atomic_add(s - session->se_target_maxslots,
4454 &nfsd_total_target_slots);
4455 session->se_target_maxslots = s;
4456 } else {
4457 kfree(slot);
4458 slot = NULL;
4459 }
4460 } while (slot && --cnt > 0);
4461 }
4462
4463 out:
4464 seq->maxslots = max(session->se_target_maxslots, seq->maxslots);
4465 seq->target_maxslots = session->se_target_maxslots;
4466
4467 switch (clp->cl_cb_state) {
4468 case NFSD4_CB_DOWN:
4469 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
4470 break;
4471 case NFSD4_CB_FAULT:
4472 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
4473 break;
4474 default:
4475 seq->status_flags = 0;
4476 }
4477 if (!list_empty(&clp->cl_revoked))
4478 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
4479 if (atomic_read(&clp->cl_admin_revoked))
4480 seq->status_flags |= SEQ4_STATUS_ADMIN_STATE_REVOKED;
4481 trace_nfsd_seq4_status(rqstp, seq);
4482 out_no_session:
4483 if (conn)
4484 free_conn(conn);
4485 spin_unlock(&nn->client_lock);
4486 return status;
4487 out_put_session:
4488 nfsd4_put_session_locked(session);
4489 goto out_no_session;
4490 }
4491
4492 void
nfsd4_sequence_done(struct nfsd4_compoundres * resp)4493 nfsd4_sequence_done(struct nfsd4_compoundres *resp)
4494 {
4495 struct nfsd4_compound_state *cs = &resp->cstate;
4496
4497 if (nfsd4_has_session(cs)) {
4498 if (cs->status != nfserr_replay_cache) {
4499 nfsd4_store_cache_entry(resp);
4500 cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
4501 }
4502 /* Drop session reference that was taken in nfsd4_sequence() */
4503 nfsd4_put_session(cs->session);
4504 } else if (cs->clp)
4505 put_client_renew(cs->clp);
4506 }
4507
4508 __be32
nfsd4_destroy_clientid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4509 nfsd4_destroy_clientid(struct svc_rqst *rqstp,
4510 struct nfsd4_compound_state *cstate,
4511 union nfsd4_op_u *u)
4512 {
4513 struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
4514 struct nfs4_client *conf, *unconf;
4515 struct nfs4_client *clp = NULL;
4516 __be32 status = 0;
4517 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4518
4519 spin_lock(&nn->client_lock);
4520 unconf = find_unconfirmed_client(&dc->clientid, true, nn);
4521 conf = find_confirmed_client(&dc->clientid, true, nn);
4522 WARN_ON_ONCE(conf && unconf);
4523
4524 if (conf) {
4525 if (client_has_state(conf)) {
4526 status = nfserr_clientid_busy;
4527 goto out;
4528 }
4529 status = mark_client_expired_locked(conf);
4530 if (status)
4531 goto out;
4532 clp = conf;
4533 } else if (unconf)
4534 clp = unconf;
4535 else {
4536 status = nfserr_stale_clientid;
4537 goto out;
4538 }
4539 if (!nfsd4_mach_creds_match(clp, rqstp)) {
4540 clp = NULL;
4541 status = nfserr_wrong_cred;
4542 goto out;
4543 }
4544 trace_nfsd_clid_destroyed(&clp->cl_clientid);
4545 unhash_client_locked(clp);
4546 out:
4547 spin_unlock(&nn->client_lock);
4548 if (clp)
4549 expire_client(clp);
4550 return status;
4551 }
4552
4553 __be32
nfsd4_reclaim_complete(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4554 nfsd4_reclaim_complete(struct svc_rqst *rqstp,
4555 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
4556 {
4557 struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
4558 struct nfs4_client *clp = cstate->clp;
4559 __be32 status = 0;
4560
4561 if (rc->rca_one_fs) {
4562 if (!cstate->current_fh.fh_dentry)
4563 return nfserr_nofilehandle;
4564 /*
4565 * We don't take advantage of the rca_one_fs case.
4566 * That's OK, it's optional, we can safely ignore it.
4567 */
4568 return nfs_ok;
4569 }
4570
4571 status = nfserr_complete_already;
4572 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
4573 goto out;
4574
4575 status = nfserr_stale_clientid;
4576 if (is_client_expired(clp))
4577 /*
4578 * The following error isn't really legal.
4579 * But we only get here if the client just explicitly
4580 * destroyed the client. Surely it no longer cares what
4581 * error it gets back on an operation for the dead
4582 * client.
4583 */
4584 goto out;
4585
4586 status = nfs_ok;
4587 trace_nfsd_clid_reclaim_complete(&clp->cl_clientid);
4588 nfsd4_client_record_create(clp);
4589 inc_reclaim_complete(clp);
4590 out:
4591 return status;
4592 }
4593
4594 __be32
nfsd4_setclientid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4595 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4596 union nfsd4_op_u *u)
4597 {
4598 struct nfsd4_setclientid *setclid = &u->setclientid;
4599 struct xdr_netobj clname = setclid->se_name;
4600 nfs4_verifier clverifier = setclid->se_verf;
4601 struct nfs4_client *conf, *new;
4602 struct nfs4_client *unconf = NULL;
4603 __be32 status;
4604 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4605
4606 new = create_client(clname, rqstp, &clverifier);
4607 if (new == NULL)
4608 return nfserr_jukebox;
4609 spin_lock(&nn->client_lock);
4610 conf = find_confirmed_client_by_name(&clname, nn);
4611 if (conf && client_has_state(conf)) {
4612 status = nfserr_clid_inuse;
4613 if (clp_used_exchangeid(conf))
4614 goto out;
4615 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
4616 trace_nfsd_clid_cred_mismatch(conf, rqstp);
4617 goto out;
4618 }
4619 }
4620 unconf = find_unconfirmed_client_by_name(&clname, nn);
4621 if (unconf)
4622 unhash_client_locked(unconf);
4623 if (conf) {
4624 if (same_verf(&conf->cl_verifier, &clverifier)) {
4625 copy_clid(new, conf);
4626 gen_confirm(new, nn);
4627 } else
4628 trace_nfsd_clid_verf_mismatch(conf, rqstp,
4629 &clverifier);
4630 } else
4631 trace_nfsd_clid_fresh(new);
4632 new->cl_minorversion = 0;
4633 gen_callback(new, setclid, rqstp);
4634 add_to_unconfirmed(new);
4635 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
4636 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
4637 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
4638 new = NULL;
4639 status = nfs_ok;
4640 out:
4641 spin_unlock(&nn->client_lock);
4642 if (new)
4643 free_client(new);
4644 if (unconf) {
4645 trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
4646 expire_client(unconf);
4647 }
4648 return status;
4649 }
4650
4651 __be32
nfsd4_setclientid_confirm(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4652 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
4653 struct nfsd4_compound_state *cstate,
4654 union nfsd4_op_u *u)
4655 {
4656 struct nfsd4_setclientid_confirm *setclientid_confirm =
4657 &u->setclientid_confirm;
4658 struct nfs4_client *conf, *unconf;
4659 struct nfs4_client *old = NULL;
4660 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
4661 clientid_t * clid = &setclientid_confirm->sc_clientid;
4662 __be32 status;
4663 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4664
4665 if (STALE_CLIENTID(clid, nn))
4666 return nfserr_stale_clientid;
4667
4668 spin_lock(&nn->client_lock);
4669 conf = find_confirmed_client(clid, false, nn);
4670 unconf = find_unconfirmed_client(clid, false, nn);
4671 /*
4672 * We try hard to give out unique clientid's, so if we get an
4673 * attempt to confirm the same clientid with a different cred,
4674 * the client may be buggy; this should never happen.
4675 *
4676 * Nevertheless, RFC 7530 recommends INUSE for this case:
4677 */
4678 status = nfserr_clid_inuse;
4679 if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
4680 trace_nfsd_clid_cred_mismatch(unconf, rqstp);
4681 goto out;
4682 }
4683 if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
4684 trace_nfsd_clid_cred_mismatch(conf, rqstp);
4685 goto out;
4686 }
4687 if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
4688 if (conf && same_verf(&confirm, &conf->cl_confirm)) {
4689 status = nfs_ok;
4690 } else
4691 status = nfserr_stale_clientid;
4692 goto out;
4693 }
4694 status = nfs_ok;
4695 if (conf) {
4696 old = unconf;
4697 unhash_client_locked(old);
4698 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
4699 } else {
4700 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
4701 if (old) {
4702 status = nfserr_clid_inuse;
4703 if (client_has_state(old)
4704 && !same_creds(&unconf->cl_cred,
4705 &old->cl_cred)) {
4706 old = NULL;
4707 goto out;
4708 }
4709 status = mark_client_expired_locked(old);
4710 if (status) {
4711 old = NULL;
4712 goto out;
4713 }
4714 trace_nfsd_clid_replaced(&old->cl_clientid);
4715 }
4716 move_to_confirmed(unconf);
4717 conf = unconf;
4718 }
4719 get_client_locked(conf);
4720 spin_unlock(&nn->client_lock);
4721 if (conf == unconf)
4722 fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY);
4723 nfsd4_probe_callback(conf);
4724 spin_lock(&nn->client_lock);
4725 put_client_renew_locked(conf);
4726 out:
4727 spin_unlock(&nn->client_lock);
4728 if (old)
4729 expire_client(old);
4730 return status;
4731 }
4732
nfsd4_alloc_file(void)4733 static struct nfs4_file *nfsd4_alloc_file(void)
4734 {
4735 return kmem_cache_alloc(file_slab, GFP_KERNEL);
4736 }
4737
4738 /* OPEN Share state helper functions */
4739
nfsd4_file_init(const struct svc_fh * fh,struct nfs4_file * fp)4740 static void nfsd4_file_init(const struct svc_fh *fh, struct nfs4_file *fp)
4741 {
4742 refcount_set(&fp->fi_ref, 1);
4743 spin_lock_init(&fp->fi_lock);
4744 INIT_LIST_HEAD(&fp->fi_stateids);
4745 INIT_LIST_HEAD(&fp->fi_delegations);
4746 INIT_LIST_HEAD(&fp->fi_clnt_odstate);
4747 fh_copy_shallow(&fp->fi_fhandle, &fh->fh_handle);
4748 fp->fi_deleg_file = NULL;
4749 fp->fi_had_conflict = false;
4750 fp->fi_share_deny = 0;
4751 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
4752 memset(fp->fi_access, 0, sizeof(fp->fi_access));
4753 fp->fi_aliased = false;
4754 fp->fi_inode = d_inode(fh->fh_dentry);
4755 #ifdef CONFIG_NFSD_PNFS
4756 INIT_LIST_HEAD(&fp->fi_lo_states);
4757 atomic_set(&fp->fi_lo_recalls, 0);
4758 #endif
4759 }
4760
4761 void
nfsd4_free_slabs(void)4762 nfsd4_free_slabs(void)
4763 {
4764 kmem_cache_destroy(client_slab);
4765 kmem_cache_destroy(openowner_slab);
4766 kmem_cache_destroy(lockowner_slab);
4767 kmem_cache_destroy(file_slab);
4768 kmem_cache_destroy(stateid_slab);
4769 kmem_cache_destroy(deleg_slab);
4770 kmem_cache_destroy(odstate_slab);
4771 }
4772
4773 int
nfsd4_init_slabs(void)4774 nfsd4_init_slabs(void)
4775 {
4776 client_slab = KMEM_CACHE(nfs4_client, 0);
4777 if (client_slab == NULL)
4778 goto out;
4779 openowner_slab = KMEM_CACHE(nfs4_openowner, 0);
4780 if (openowner_slab == NULL)
4781 goto out_free_client_slab;
4782 lockowner_slab = KMEM_CACHE(nfs4_lockowner, 0);
4783 if (lockowner_slab == NULL)
4784 goto out_free_openowner_slab;
4785 file_slab = KMEM_CACHE(nfs4_file, 0);
4786 if (file_slab == NULL)
4787 goto out_free_lockowner_slab;
4788 stateid_slab = KMEM_CACHE(nfs4_ol_stateid, 0);
4789 if (stateid_slab == NULL)
4790 goto out_free_file_slab;
4791 deleg_slab = KMEM_CACHE(nfs4_delegation, 0);
4792 if (deleg_slab == NULL)
4793 goto out_free_stateid_slab;
4794 odstate_slab = KMEM_CACHE(nfs4_clnt_odstate, 0);
4795 if (odstate_slab == NULL)
4796 goto out_free_deleg_slab;
4797 return 0;
4798
4799 out_free_deleg_slab:
4800 kmem_cache_destroy(deleg_slab);
4801 out_free_stateid_slab:
4802 kmem_cache_destroy(stateid_slab);
4803 out_free_file_slab:
4804 kmem_cache_destroy(file_slab);
4805 out_free_lockowner_slab:
4806 kmem_cache_destroy(lockowner_slab);
4807 out_free_openowner_slab:
4808 kmem_cache_destroy(openowner_slab);
4809 out_free_client_slab:
4810 kmem_cache_destroy(client_slab);
4811 out:
4812 return -ENOMEM;
4813 }
4814
4815 static unsigned long
nfsd4_state_shrinker_count(struct shrinker * shrink,struct shrink_control * sc)4816 nfsd4_state_shrinker_count(struct shrinker *shrink, struct shrink_control *sc)
4817 {
4818 int count;
4819 struct nfsd_net *nn = shrink->private_data;
4820
4821 count = atomic_read(&nn->nfsd_courtesy_clients);
4822 if (!count)
4823 count = atomic_long_read(&num_delegations);
4824 if (count)
4825 queue_work(laundry_wq, &nn->nfsd_shrinker_work);
4826 return (unsigned long)count;
4827 }
4828
4829 static unsigned long
nfsd4_state_shrinker_scan(struct shrinker * shrink,struct shrink_control * sc)4830 nfsd4_state_shrinker_scan(struct shrinker *shrink, struct shrink_control *sc)
4831 {
4832 return SHRINK_STOP;
4833 }
4834
4835 void
nfsd4_init_leases_net(struct nfsd_net * nn)4836 nfsd4_init_leases_net(struct nfsd_net *nn)
4837 {
4838 struct sysinfo si;
4839 u64 max_clients;
4840
4841 nn->nfsd4_lease = 90; /* default lease time */
4842 nn->nfsd4_grace = 90;
4843 nn->somebody_reclaimed = false;
4844 nn->track_reclaim_completes = false;
4845 nn->clverifier_counter = get_random_u32();
4846 nn->clientid_base = get_random_u32();
4847 nn->clientid_counter = nn->clientid_base + 1;
4848 nn->s2s_cp_cl_id = nn->clientid_counter++;
4849
4850 atomic_set(&nn->nfs4_client_count, 0);
4851 si_meminfo(&si);
4852 max_clients = (u64)si.totalram * si.mem_unit / (1024 * 1024 * 1024);
4853 max_clients *= NFS4_CLIENTS_PER_GB;
4854 nn->nfs4_max_clients = max_t(int, max_clients, NFS4_CLIENTS_PER_GB);
4855
4856 atomic_set(&nn->nfsd_courtesy_clients, 0);
4857 }
4858
4859 enum rp_lock {
4860 RP_UNLOCKED,
4861 RP_LOCKED,
4862 RP_UNHASHED,
4863 };
4864
init_nfs4_replay(struct nfs4_replay * rp)4865 static void init_nfs4_replay(struct nfs4_replay *rp)
4866 {
4867 rp->rp_status = nfserr_serverfault;
4868 rp->rp_buflen = 0;
4869 rp->rp_buf = rp->rp_ibuf;
4870 rp->rp_locked = RP_UNLOCKED;
4871 }
4872
nfsd4_cstate_assign_replay(struct nfsd4_compound_state * cstate,struct nfs4_stateowner * so)4873 static int nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
4874 struct nfs4_stateowner *so)
4875 {
4876 if (!nfsd4_has_session(cstate)) {
4877 wait_var_event(&so->so_replay.rp_locked,
4878 cmpxchg(&so->so_replay.rp_locked,
4879 RP_UNLOCKED, RP_LOCKED) != RP_LOCKED);
4880 if (so->so_replay.rp_locked == RP_UNHASHED)
4881 return -EAGAIN;
4882 cstate->replay_owner = nfs4_get_stateowner(so);
4883 }
4884 return 0;
4885 }
4886
nfsd4_cstate_clear_replay(struct nfsd4_compound_state * cstate)4887 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
4888 {
4889 struct nfs4_stateowner *so = cstate->replay_owner;
4890
4891 if (so != NULL) {
4892 cstate->replay_owner = NULL;
4893 store_release_wake_up(&so->so_replay.rp_locked, RP_UNLOCKED);
4894 nfs4_put_stateowner(so);
4895 }
4896 }
4897
alloc_stateowner(struct kmem_cache * slab,struct xdr_netobj * owner,struct nfs4_client * clp)4898 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
4899 {
4900 struct nfs4_stateowner *sop;
4901
4902 sop = kmem_cache_alloc(slab, GFP_KERNEL);
4903 if (!sop)
4904 return NULL;
4905
4906 xdr_netobj_dup(&sop->so_owner, owner, GFP_KERNEL);
4907 if (!sop->so_owner.data) {
4908 kmem_cache_free(slab, sop);
4909 return NULL;
4910 }
4911
4912 INIT_LIST_HEAD(&sop->so_stateids);
4913 sop->so_client = clp;
4914 init_nfs4_replay(&sop->so_replay);
4915 atomic_set(&sop->so_count, 1);
4916 return sop;
4917 }
4918
hash_openowner(struct nfs4_openowner * oo,struct nfs4_client * clp,unsigned int strhashval)4919 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
4920 {
4921 lockdep_assert_held(&clp->cl_lock);
4922
4923 list_add(&oo->oo_owner.so_strhash,
4924 &clp->cl_ownerstr_hashtbl[strhashval]);
4925 list_add(&oo->oo_perclient, &clp->cl_openowners);
4926 }
4927
nfs4_unhash_openowner(struct nfs4_stateowner * so)4928 static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
4929 {
4930 unhash_openowner_locked(openowner(so));
4931 }
4932
nfs4_free_openowner(struct nfs4_stateowner * so)4933 static void nfs4_free_openowner(struct nfs4_stateowner *so)
4934 {
4935 struct nfs4_openowner *oo = openowner(so);
4936
4937 kmem_cache_free(openowner_slab, oo);
4938 }
4939
4940 static const struct nfs4_stateowner_operations openowner_ops = {
4941 .so_unhash = nfs4_unhash_openowner,
4942 .so_free = nfs4_free_openowner,
4943 };
4944
4945 static struct nfs4_ol_stateid *
nfsd4_find_existing_open(struct nfs4_file * fp,struct nfsd4_open * open)4946 nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4947 {
4948 struct nfs4_ol_stateid *local, *ret = NULL;
4949 struct nfs4_openowner *oo = open->op_openowner;
4950
4951 lockdep_assert_held(&fp->fi_lock);
4952
4953 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
4954 /* ignore lock owners */
4955 if (local->st_stateowner->so_is_open_owner == 0)
4956 continue;
4957 if (local->st_stateowner != &oo->oo_owner)
4958 continue;
4959 if (local->st_stid.sc_type == SC_TYPE_OPEN &&
4960 !local->st_stid.sc_status) {
4961 ret = local;
4962 refcount_inc(&ret->st_stid.sc_count);
4963 break;
4964 }
4965 }
4966 return ret;
4967 }
4968
nfsd4_drop_revoked_stid(struct nfs4_stid * s)4969 static void nfsd4_drop_revoked_stid(struct nfs4_stid *s)
4970 __releases(&s->sc_client->cl_lock)
4971 {
4972 struct nfs4_client *cl = s->sc_client;
4973 LIST_HEAD(reaplist);
4974 struct nfs4_ol_stateid *stp;
4975 struct nfs4_delegation *dp;
4976 bool unhashed;
4977
4978 switch (s->sc_type) {
4979 case SC_TYPE_OPEN:
4980 stp = openlockstateid(s);
4981 if (unhash_open_stateid(stp, &reaplist))
4982 put_ol_stateid_locked(stp, &reaplist);
4983 spin_unlock(&cl->cl_lock);
4984 free_ol_stateid_reaplist(&reaplist);
4985 break;
4986 case SC_TYPE_LOCK:
4987 stp = openlockstateid(s);
4988 unhashed = unhash_lock_stateid(stp);
4989 spin_unlock(&cl->cl_lock);
4990 if (unhashed)
4991 nfs4_put_stid(s);
4992 break;
4993 case SC_TYPE_DELEG:
4994 dp = delegstateid(s);
4995 list_del_init(&dp->dl_recall_lru);
4996 spin_unlock(&cl->cl_lock);
4997 nfs4_put_stid(s);
4998 break;
4999 default:
5000 spin_unlock(&cl->cl_lock);
5001 }
5002 }
5003
nfsd40_drop_revoked_stid(struct nfs4_client * cl,stateid_t * stid)5004 static void nfsd40_drop_revoked_stid(struct nfs4_client *cl,
5005 stateid_t *stid)
5006 {
5007 /* NFSv4.0 has no way for the client to tell the server
5008 * that it can forget an admin-revoked stateid.
5009 * So we keep it around until the first time that the
5010 * client uses it, and drop it the first time
5011 * nfserr_admin_revoked is returned.
5012 * For v4.1 and later we wait until explicitly told
5013 * to free the stateid.
5014 */
5015 if (cl->cl_minorversion == 0) {
5016 struct nfs4_stid *st;
5017
5018 spin_lock(&cl->cl_lock);
5019 st = find_stateid_locked(cl, stid);
5020 if (st)
5021 nfsd4_drop_revoked_stid(st);
5022 else
5023 spin_unlock(&cl->cl_lock);
5024 }
5025 }
5026
5027 static __be32
nfsd4_verify_open_stid(struct nfs4_stid * s)5028 nfsd4_verify_open_stid(struct nfs4_stid *s)
5029 {
5030 __be32 ret = nfs_ok;
5031
5032 if (s->sc_status & SC_STATUS_ADMIN_REVOKED)
5033 ret = nfserr_admin_revoked;
5034 else if (s->sc_status & SC_STATUS_REVOKED)
5035 ret = nfserr_deleg_revoked;
5036 else if (s->sc_status & SC_STATUS_CLOSED)
5037 ret = nfserr_bad_stateid;
5038 return ret;
5039 }
5040
5041 /* Lock the stateid st_mutex, and deal with races with CLOSE */
5042 static __be32
nfsd4_lock_ol_stateid(struct nfs4_ol_stateid * stp)5043 nfsd4_lock_ol_stateid(struct nfs4_ol_stateid *stp)
5044 {
5045 __be32 ret;
5046
5047 mutex_lock_nested(&stp->st_mutex, LOCK_STATEID_MUTEX);
5048 ret = nfsd4_verify_open_stid(&stp->st_stid);
5049 if (ret == nfserr_admin_revoked)
5050 nfsd40_drop_revoked_stid(stp->st_stid.sc_client,
5051 &stp->st_stid.sc_stateid);
5052
5053 if (ret != nfs_ok)
5054 mutex_unlock(&stp->st_mutex);
5055 return ret;
5056 }
5057
5058 static struct nfs4_ol_stateid *
nfsd4_find_and_lock_existing_open(struct nfs4_file * fp,struct nfsd4_open * open)5059 nfsd4_find_and_lock_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
5060 {
5061 struct nfs4_ol_stateid *stp;
5062 for (;;) {
5063 spin_lock(&fp->fi_lock);
5064 stp = nfsd4_find_existing_open(fp, open);
5065 spin_unlock(&fp->fi_lock);
5066 if (!stp || nfsd4_lock_ol_stateid(stp) == nfs_ok)
5067 break;
5068 nfs4_put_stid(&stp->st_stid);
5069 }
5070 return stp;
5071 }
5072
5073 static struct nfs4_openowner *
find_or_alloc_open_stateowner(unsigned int strhashval,struct nfsd4_open * open,struct nfsd4_compound_state * cstate)5074 find_or_alloc_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
5075 struct nfsd4_compound_state *cstate)
5076 {
5077 struct nfs4_client *clp = cstate->clp;
5078 struct nfs4_openowner *oo, *new = NULL;
5079
5080 retry:
5081 spin_lock(&clp->cl_lock);
5082 oo = find_openstateowner_str(strhashval, open, clp);
5083 if (!oo && new) {
5084 hash_openowner(new, clp, strhashval);
5085 spin_unlock(&clp->cl_lock);
5086 return new;
5087 }
5088 spin_unlock(&clp->cl_lock);
5089
5090 if (oo && !(oo->oo_flags & NFS4_OO_CONFIRMED)) {
5091 /* Replace unconfirmed owners without checking for replay. */
5092 release_openowner(oo);
5093 oo = NULL;
5094 }
5095 if (oo) {
5096 if (new)
5097 nfs4_free_stateowner(&new->oo_owner);
5098 return oo;
5099 }
5100
5101 new = alloc_stateowner(openowner_slab, &open->op_owner, clp);
5102 if (!new)
5103 return NULL;
5104 new->oo_owner.so_ops = &openowner_ops;
5105 new->oo_owner.so_is_open_owner = 1;
5106 new->oo_owner.so_seqid = open->op_seqid;
5107 new->oo_flags = 0;
5108 if (nfsd4_has_session(cstate))
5109 new->oo_flags |= NFS4_OO_CONFIRMED;
5110 new->oo_time = 0;
5111 new->oo_last_closed_stid = NULL;
5112 INIT_LIST_HEAD(&new->oo_close_lru);
5113 goto retry;
5114 }
5115
5116 static struct nfs4_ol_stateid *
init_open_stateid(struct nfs4_file * fp,struct nfsd4_open * open)5117 init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
5118 {
5119
5120 struct nfs4_openowner *oo = open->op_openowner;
5121 struct nfs4_ol_stateid *retstp = NULL;
5122 struct nfs4_ol_stateid *stp;
5123
5124 stp = open->op_stp;
5125 /* We are moving these outside of the spinlocks to avoid the warnings */
5126 mutex_init(&stp->st_mutex);
5127 mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
5128
5129 retry:
5130 spin_lock(&oo->oo_owner.so_client->cl_lock);
5131 spin_lock(&fp->fi_lock);
5132
5133 if (nfs4_openowner_unhashed(oo)) {
5134 mutex_unlock(&stp->st_mutex);
5135 stp = NULL;
5136 goto out_unlock;
5137 }
5138
5139 retstp = nfsd4_find_existing_open(fp, open);
5140 if (retstp)
5141 goto out_unlock;
5142
5143 open->op_stp = NULL;
5144 refcount_inc(&stp->st_stid.sc_count);
5145 stp->st_stid.sc_type = SC_TYPE_OPEN;
5146 INIT_LIST_HEAD(&stp->st_locks);
5147 stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
5148 get_nfs4_file(fp);
5149 stp->st_stid.sc_file = fp;
5150 stp->st_access_bmap = 0;
5151 stp->st_deny_bmap = 0;
5152 stp->st_openstp = NULL;
5153 list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
5154 list_add(&stp->st_perfile, &fp->fi_stateids);
5155
5156 out_unlock:
5157 spin_unlock(&fp->fi_lock);
5158 spin_unlock(&oo->oo_owner.so_client->cl_lock);
5159 if (retstp) {
5160 /* Handle races with CLOSE */
5161 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
5162 nfs4_put_stid(&retstp->st_stid);
5163 goto retry;
5164 }
5165 /* To keep mutex tracking happy */
5166 mutex_unlock(&stp->st_mutex);
5167 stp = retstp;
5168 }
5169 return stp;
5170 }
5171
5172 /*
5173 * In the 4.0 case we need to keep the owners around a little while to handle
5174 * CLOSE replay. We still do need to release any file access that is held by
5175 * them before returning however.
5176 */
5177 static void
move_to_close_lru(struct nfs4_ol_stateid * s,struct net * net)5178 move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
5179 {
5180 struct nfs4_ol_stateid *last;
5181 struct nfs4_openowner *oo = openowner(s->st_stateowner);
5182 struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
5183 nfsd_net_id);
5184
5185 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
5186
5187 /*
5188 * We know that we hold one reference via nfsd4_close, and another
5189 * "persistent" reference for the client. If the refcount is higher
5190 * than 2, then there are still calls in progress that are using this
5191 * stateid. We can't put the sc_file reference until they are finished.
5192 * Wait for the refcount to drop to 2. Since it has been unhashed,
5193 * there should be no danger of the refcount going back up again at
5194 * this point.
5195 * Some threads with a reference might be waiting for rp_locked,
5196 * so tell them to stop waiting.
5197 */
5198 store_release_wake_up(&oo->oo_owner.so_replay.rp_locked, RP_UNHASHED);
5199 wait_event(close_wq, refcount_read(&s->st_stid.sc_count) == 2);
5200
5201 release_all_access(s);
5202 if (s->st_stid.sc_file) {
5203 put_nfs4_file(s->st_stid.sc_file);
5204 s->st_stid.sc_file = NULL;
5205 }
5206
5207 spin_lock(&nn->client_lock);
5208 last = oo->oo_last_closed_stid;
5209 oo->oo_last_closed_stid = s;
5210 list_move_tail(&oo->oo_close_lru, &nn->close_lru);
5211 oo->oo_time = ktime_get_boottime_seconds();
5212 spin_unlock(&nn->client_lock);
5213 if (last)
5214 nfs4_put_stid(&last->st_stid);
5215 }
5216
5217 static noinline_for_stack struct nfs4_file *
nfsd4_file_hash_lookup(const struct svc_fh * fhp)5218 nfsd4_file_hash_lookup(const struct svc_fh *fhp)
5219 {
5220 struct inode *inode = d_inode(fhp->fh_dentry);
5221 struct rhlist_head *tmp, *list;
5222 struct nfs4_file *fi;
5223
5224 rcu_read_lock();
5225 list = rhltable_lookup(&nfs4_file_rhltable, &inode,
5226 nfs4_file_rhash_params);
5227 rhl_for_each_entry_rcu(fi, tmp, list, fi_rlist) {
5228 if (fh_match(&fi->fi_fhandle, &fhp->fh_handle)) {
5229 if (refcount_inc_not_zero(&fi->fi_ref)) {
5230 rcu_read_unlock();
5231 return fi;
5232 }
5233 }
5234 }
5235 rcu_read_unlock();
5236 return NULL;
5237 }
5238
5239 /*
5240 * On hash insertion, identify entries with the same inode but
5241 * distinct filehandles. They will all be on the list returned
5242 * by rhltable_lookup().
5243 *
5244 * inode->i_lock prevents racing insertions from adding an entry
5245 * for the same inode/fhp pair twice.
5246 */
5247 static noinline_for_stack struct nfs4_file *
nfsd4_file_hash_insert(struct nfs4_file * new,const struct svc_fh * fhp)5248 nfsd4_file_hash_insert(struct nfs4_file *new, const struct svc_fh *fhp)
5249 {
5250 struct inode *inode = d_inode(fhp->fh_dentry);
5251 struct rhlist_head *tmp, *list;
5252 struct nfs4_file *ret = NULL;
5253 bool alias_found = false;
5254 struct nfs4_file *fi;
5255 int err;
5256
5257 rcu_read_lock();
5258 spin_lock(&inode->i_lock);
5259
5260 list = rhltable_lookup(&nfs4_file_rhltable, &inode,
5261 nfs4_file_rhash_params);
5262 rhl_for_each_entry_rcu(fi, tmp, list, fi_rlist) {
5263 if (fh_match(&fi->fi_fhandle, &fhp->fh_handle)) {
5264 if (refcount_inc_not_zero(&fi->fi_ref))
5265 ret = fi;
5266 } else
5267 fi->fi_aliased = alias_found = true;
5268 }
5269 if (ret)
5270 goto out_unlock;
5271
5272 nfsd4_file_init(fhp, new);
5273 err = rhltable_insert(&nfs4_file_rhltable, &new->fi_rlist,
5274 nfs4_file_rhash_params);
5275 if (err)
5276 goto out_unlock;
5277
5278 new->fi_aliased = alias_found;
5279 ret = new;
5280
5281 out_unlock:
5282 spin_unlock(&inode->i_lock);
5283 rcu_read_unlock();
5284 return ret;
5285 }
5286
nfsd4_file_hash_remove(struct nfs4_file * fi)5287 static noinline_for_stack void nfsd4_file_hash_remove(struct nfs4_file *fi)
5288 {
5289 rhltable_remove(&nfs4_file_rhltable, &fi->fi_rlist,
5290 nfs4_file_rhash_params);
5291 }
5292
5293 /*
5294 * Called to check deny when READ with all zero stateid or
5295 * WRITE with all zero or all one stateid
5296 */
5297 static __be32
nfs4_share_conflict(struct svc_fh * current_fh,unsigned int deny_type)5298 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
5299 {
5300 struct nfs4_file *fp;
5301 __be32 ret = nfs_ok;
5302
5303 fp = nfsd4_file_hash_lookup(current_fh);
5304 if (!fp)
5305 return ret;
5306
5307 /* Check for conflicting share reservations */
5308 spin_lock(&fp->fi_lock);
5309 if (fp->fi_share_deny & deny_type)
5310 ret = nfserr_locked;
5311 spin_unlock(&fp->fi_lock);
5312 put_nfs4_file(fp);
5313 return ret;
5314 }
5315
nfsd4_deleg_present(const struct inode * inode)5316 static bool nfsd4_deleg_present(const struct inode *inode)
5317 {
5318 struct file_lock_context *ctx = locks_inode_context(inode);
5319
5320 return ctx && !list_empty_careful(&ctx->flc_lease);
5321 }
5322
5323 /**
5324 * nfsd_wait_for_delegreturn - wait for delegations to be returned
5325 * @rqstp: the RPC transaction being executed
5326 * @inode: in-core inode of the file being waited for
5327 *
5328 * The timeout prevents deadlock if all nfsd threads happen to be
5329 * tied up waiting for returning delegations.
5330 *
5331 * Return values:
5332 * %true: delegation was returned
5333 * %false: timed out waiting for delegreturn
5334 */
nfsd_wait_for_delegreturn(struct svc_rqst * rqstp,struct inode * inode)5335 bool nfsd_wait_for_delegreturn(struct svc_rqst *rqstp, struct inode *inode)
5336 {
5337 long __maybe_unused timeo;
5338
5339 timeo = wait_var_event_timeout(inode, !nfsd4_deleg_present(inode),
5340 NFSD_DELEGRETURN_TIMEOUT);
5341 trace_nfsd_delegret_wakeup(rqstp, inode, timeo);
5342 return timeo > 0;
5343 }
5344
nfsd4_cb_recall_prepare(struct nfsd4_callback * cb)5345 static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
5346 {
5347 struct nfs4_delegation *dp = cb_to_delegation(cb);
5348 struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
5349 nfsd_net_id);
5350
5351 block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
5352
5353 /*
5354 * We can't do this in nfsd_break_deleg_cb because it is
5355 * already holding inode->i_lock.
5356 *
5357 * If the dl_time != 0, then we know that it has already been
5358 * queued for a lease break. Don't queue it again.
5359 */
5360 spin_lock(&state_lock);
5361 if (delegation_hashed(dp) && dp->dl_time == 0) {
5362 dp->dl_time = ktime_get_boottime_seconds();
5363 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
5364 }
5365 spin_unlock(&state_lock);
5366 }
5367
nfsd4_cb_recall_done(struct nfsd4_callback * cb,struct rpc_task * task)5368 static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
5369 struct rpc_task *task)
5370 {
5371 struct nfs4_delegation *dp = cb_to_delegation(cb);
5372
5373 trace_nfsd_cb_recall_done(&dp->dl_stid.sc_stateid, task);
5374
5375 if (dp->dl_stid.sc_status)
5376 /* CLOSED or REVOKED */
5377 return 1;
5378
5379 switch (task->tk_status) {
5380 case 0:
5381 return 1;
5382 case -NFS4ERR_DELAY:
5383 rpc_delay(task, 2 * HZ);
5384 return 0;
5385 case -EBADHANDLE:
5386 case -NFS4ERR_BAD_STATEID:
5387 /*
5388 * Race: client probably got cb_recall before open reply
5389 * granting delegation.
5390 */
5391 if (dp->dl_retries--) {
5392 rpc_delay(task, 2 * HZ);
5393 return 0;
5394 }
5395 fallthrough;
5396 default:
5397 return 1;
5398 }
5399 }
5400
nfsd4_cb_recall_release(struct nfsd4_callback * cb)5401 static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
5402 {
5403 struct nfs4_delegation *dp = cb_to_delegation(cb);
5404
5405 nfs4_put_stid(&dp->dl_stid);
5406 }
5407
5408 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
5409 .prepare = nfsd4_cb_recall_prepare,
5410 .done = nfsd4_cb_recall_done,
5411 .release = nfsd4_cb_recall_release,
5412 .opcode = OP_CB_RECALL,
5413 };
5414
nfsd_break_one_deleg(struct nfs4_delegation * dp)5415 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
5416 {
5417 /*
5418 * We're assuming the state code never drops its reference
5419 * without first removing the lease. Since we're in this lease
5420 * callback (and since the lease code is serialized by the
5421 * flc_lock) we know the server hasn't removed the lease yet, and
5422 * we know it's safe to take a reference.
5423 */
5424 refcount_inc(&dp->dl_stid.sc_count);
5425 WARN_ON_ONCE(!nfsd4_run_cb(&dp->dl_recall));
5426 }
5427
5428 /* Called from break_lease() with flc_lock held. */
5429 static bool
nfsd_break_deleg_cb(struct file_lease * fl)5430 nfsd_break_deleg_cb(struct file_lease *fl)
5431 {
5432 struct nfs4_delegation *dp = (struct nfs4_delegation *) fl->c.flc_owner;
5433 struct nfs4_file *fp = dp->dl_stid.sc_file;
5434 struct nfs4_client *clp = dp->dl_stid.sc_client;
5435 struct nfsd_net *nn;
5436
5437 trace_nfsd_cb_recall(&dp->dl_stid);
5438
5439 dp->dl_recalled = true;
5440 atomic_inc(&clp->cl_delegs_in_recall);
5441 if (try_to_expire_client(clp)) {
5442 nn = net_generic(clp->net, nfsd_net_id);
5443 mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
5444 }
5445
5446 /*
5447 * We don't want the locks code to timeout the lease for us;
5448 * we'll remove it ourself if a delegation isn't returned
5449 * in time:
5450 */
5451 fl->fl_break_time = 0;
5452
5453 fp->fi_had_conflict = true;
5454 nfsd_break_one_deleg(dp);
5455 return false;
5456 }
5457
5458 /**
5459 * nfsd_breaker_owns_lease - Check if lease conflict was resolved
5460 * @fl: Lock state to check
5461 *
5462 * Return values:
5463 * %true: Lease conflict was resolved
5464 * %false: Lease conflict was not resolved.
5465 */
nfsd_breaker_owns_lease(struct file_lease * fl)5466 static bool nfsd_breaker_owns_lease(struct file_lease *fl)
5467 {
5468 struct nfs4_delegation *dl = fl->c.flc_owner;
5469 struct svc_rqst *rqst;
5470 struct nfs4_client *clp;
5471
5472 rqst = nfsd_current_rqst();
5473 if (!nfsd_v4client(rqst))
5474 return false;
5475 clp = *(rqst->rq_lease_breaker);
5476 return dl->dl_stid.sc_client == clp;
5477 }
5478
5479 static int
nfsd_change_deleg_cb(struct file_lease * onlist,int arg,struct list_head * dispose)5480 nfsd_change_deleg_cb(struct file_lease *onlist, int arg,
5481 struct list_head *dispose)
5482 {
5483 struct nfs4_delegation *dp = (struct nfs4_delegation *) onlist->c.flc_owner;
5484 struct nfs4_client *clp = dp->dl_stid.sc_client;
5485
5486 if (arg & F_UNLCK) {
5487 if (dp->dl_recalled)
5488 atomic_dec(&clp->cl_delegs_in_recall);
5489 return lease_modify(onlist, arg, dispose);
5490 } else
5491 return -EAGAIN;
5492 }
5493
5494 static const struct lease_manager_operations nfsd_lease_mng_ops = {
5495 .lm_breaker_owns_lease = nfsd_breaker_owns_lease,
5496 .lm_break = nfsd_break_deleg_cb,
5497 .lm_change = nfsd_change_deleg_cb,
5498 };
5499
nfsd4_check_seqid(struct nfsd4_compound_state * cstate,struct nfs4_stateowner * so,u32 seqid)5500 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
5501 {
5502 if (nfsd4_has_session(cstate))
5503 return nfs_ok;
5504 if (seqid == so->so_seqid - 1)
5505 return nfserr_replay_me;
5506 if (seqid == so->so_seqid)
5507 return nfs_ok;
5508 return nfserr_bad_seqid;
5509 }
5510
lookup_clientid(clientid_t * clid,bool sessions,struct nfsd_net * nn)5511 static struct nfs4_client *lookup_clientid(clientid_t *clid, bool sessions,
5512 struct nfsd_net *nn)
5513 {
5514 struct nfs4_client *found;
5515
5516 spin_lock(&nn->client_lock);
5517 found = find_confirmed_client(clid, sessions, nn);
5518 if (found)
5519 atomic_inc(&found->cl_rpc_users);
5520 spin_unlock(&nn->client_lock);
5521 return found;
5522 }
5523
set_client(clientid_t * clid,struct nfsd4_compound_state * cstate,struct nfsd_net * nn)5524 static __be32 set_client(clientid_t *clid,
5525 struct nfsd4_compound_state *cstate,
5526 struct nfsd_net *nn)
5527 {
5528 if (cstate->clp) {
5529 if (!same_clid(&cstate->clp->cl_clientid, clid))
5530 return nfserr_stale_clientid;
5531 return nfs_ok;
5532 }
5533 if (STALE_CLIENTID(clid, nn))
5534 return nfserr_stale_clientid;
5535 /*
5536 * We're in the 4.0 case (otherwise the SEQUENCE op would have
5537 * set cstate->clp), so session = false:
5538 */
5539 cstate->clp = lookup_clientid(clid, false, nn);
5540 if (!cstate->clp)
5541 return nfserr_expired;
5542 return nfs_ok;
5543 }
5544
5545 __be32
nfsd4_process_open1(struct nfsd4_compound_state * cstate,struct nfsd4_open * open,struct nfsd_net * nn)5546 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
5547 struct nfsd4_open *open, struct nfsd_net *nn)
5548 {
5549 clientid_t *clientid = &open->op_clientid;
5550 struct nfs4_client *clp = NULL;
5551 unsigned int strhashval;
5552 struct nfs4_openowner *oo = NULL;
5553 __be32 status;
5554
5555 /*
5556 * In case we need it later, after we've already created the
5557 * file and don't want to risk a further failure:
5558 */
5559 open->op_file = nfsd4_alloc_file();
5560 if (open->op_file == NULL)
5561 return nfserr_jukebox;
5562
5563 status = set_client(clientid, cstate, nn);
5564 if (status)
5565 return status;
5566 clp = cstate->clp;
5567
5568 strhashval = ownerstr_hashval(&open->op_owner);
5569 retry:
5570 oo = find_or_alloc_open_stateowner(strhashval, open, cstate);
5571 open->op_openowner = oo;
5572 if (!oo)
5573 return nfserr_jukebox;
5574 if (nfsd4_cstate_assign_replay(cstate, &oo->oo_owner) == -EAGAIN) {
5575 nfs4_put_stateowner(&oo->oo_owner);
5576 goto retry;
5577 }
5578 status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
5579 if (status)
5580 return status;
5581
5582 open->op_stp = nfs4_alloc_open_stateid(clp);
5583 if (!open->op_stp)
5584 return nfserr_jukebox;
5585
5586 if (nfsd4_has_session(cstate) &&
5587 (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
5588 open->op_odstate = alloc_clnt_odstate(clp);
5589 if (!open->op_odstate)
5590 return nfserr_jukebox;
5591 }
5592
5593 return nfs_ok;
5594 }
5595
5596 static inline __be32
nfs4_check_delegmode(struct nfs4_delegation * dp,int flags)5597 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
5598 {
5599 if (!(flags & RD_STATE) && deleg_is_read(dp->dl_type))
5600 return nfserr_openmode;
5601 else
5602 return nfs_ok;
5603 }
5604
share_access_to_flags(u32 share_access)5605 static int share_access_to_flags(u32 share_access)
5606 {
5607 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
5608 }
5609
find_deleg_stateid(struct nfs4_client * cl,stateid_t * s)5610 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl,
5611 stateid_t *s)
5612 {
5613 struct nfs4_stid *ret;
5614
5615 ret = find_stateid_by_type(cl, s, SC_TYPE_DELEG, SC_STATUS_REVOKED);
5616 if (!ret)
5617 return NULL;
5618 return delegstateid(ret);
5619 }
5620
nfsd4_is_deleg_cur(struct nfsd4_open * open)5621 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
5622 {
5623 return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
5624 open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
5625 }
5626
5627 static __be32
nfs4_check_deleg(struct nfs4_client * cl,struct nfsd4_open * open,struct nfs4_delegation ** dp)5628 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
5629 struct nfs4_delegation **dp)
5630 {
5631 int flags;
5632 __be32 status = nfserr_bad_stateid;
5633 struct nfs4_delegation *deleg;
5634
5635 deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
5636 if (deleg == NULL)
5637 goto out;
5638 if (deleg->dl_stid.sc_status & SC_STATUS_ADMIN_REVOKED) {
5639 nfs4_put_stid(&deleg->dl_stid);
5640 status = nfserr_admin_revoked;
5641 goto out;
5642 }
5643 if (deleg->dl_stid.sc_status & SC_STATUS_REVOKED) {
5644 nfs4_put_stid(&deleg->dl_stid);
5645 nfsd40_drop_revoked_stid(cl, &open->op_delegate_stateid);
5646 status = nfserr_deleg_revoked;
5647 goto out;
5648 }
5649 flags = share_access_to_flags(open->op_share_access);
5650 status = nfs4_check_delegmode(deleg, flags);
5651 if (status) {
5652 nfs4_put_stid(&deleg->dl_stid);
5653 goto out;
5654 }
5655 *dp = deleg;
5656 out:
5657 if (!nfsd4_is_deleg_cur(open))
5658 return nfs_ok;
5659 if (status)
5660 return status;
5661 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
5662 return nfs_ok;
5663 }
5664
nfs4_access_to_access(u32 nfs4_access)5665 static inline int nfs4_access_to_access(u32 nfs4_access)
5666 {
5667 int flags = 0;
5668
5669 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
5670 flags |= NFSD_MAY_READ;
5671 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
5672 flags |= NFSD_MAY_WRITE;
5673 return flags;
5674 }
5675
5676 static inline __be32
nfsd4_truncate(struct svc_rqst * rqstp,struct svc_fh * fh,struct nfsd4_open * open)5677 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
5678 struct nfsd4_open *open)
5679 {
5680 struct iattr iattr = {
5681 .ia_valid = ATTR_SIZE,
5682 .ia_size = 0,
5683 };
5684 struct nfsd_attrs attrs = {
5685 .na_iattr = &iattr,
5686 };
5687 if (!open->op_truncate)
5688 return 0;
5689 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
5690 return nfserr_inval;
5691 return nfsd_setattr(rqstp, fh, &attrs, NULL);
5692 }
5693
nfs4_get_vfs_file(struct svc_rqst * rqstp,struct nfs4_file * fp,struct svc_fh * cur_fh,struct nfs4_ol_stateid * stp,struct nfsd4_open * open,bool new_stp)5694 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
5695 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
5696 struct nfsd4_open *open, bool new_stp)
5697 {
5698 struct nfsd_file *nf = NULL;
5699 __be32 status;
5700 int oflag = nfs4_access_to_omode(open->op_share_access);
5701 int access = nfs4_access_to_access(open->op_share_access);
5702 unsigned char old_access_bmap, old_deny_bmap;
5703
5704 spin_lock(&fp->fi_lock);
5705
5706 /*
5707 * Are we trying to set a deny mode that would conflict with
5708 * current access?
5709 */
5710 status = nfs4_file_check_deny(fp, open->op_share_deny);
5711 if (status != nfs_ok) {
5712 if (status != nfserr_share_denied) {
5713 spin_unlock(&fp->fi_lock);
5714 goto out;
5715 }
5716 if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
5717 stp, open->op_share_deny, false))
5718 status = nfserr_jukebox;
5719 spin_unlock(&fp->fi_lock);
5720 goto out;
5721 }
5722
5723 /* set access to the file */
5724 status = nfs4_file_get_access(fp, open->op_share_access);
5725 if (status != nfs_ok) {
5726 if (status != nfserr_share_denied) {
5727 spin_unlock(&fp->fi_lock);
5728 goto out;
5729 }
5730 if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
5731 stp, open->op_share_access, true))
5732 status = nfserr_jukebox;
5733 spin_unlock(&fp->fi_lock);
5734 goto out;
5735 }
5736
5737 /* Set access bits in stateid */
5738 old_access_bmap = stp->st_access_bmap;
5739 set_access(open->op_share_access, stp);
5740
5741 /* Set new deny mask */
5742 old_deny_bmap = stp->st_deny_bmap;
5743 set_deny(open->op_share_deny, stp);
5744 fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
5745
5746 if (!fp->fi_fds[oflag]) {
5747 spin_unlock(&fp->fi_lock);
5748
5749 status = nfsd_file_acquire_opened(rqstp, cur_fh, access,
5750 open->op_filp, &nf);
5751 if (status != nfs_ok)
5752 goto out_put_access;
5753
5754 spin_lock(&fp->fi_lock);
5755 if (!fp->fi_fds[oflag]) {
5756 fp->fi_fds[oflag] = nf;
5757 nf = NULL;
5758 }
5759 }
5760 spin_unlock(&fp->fi_lock);
5761 if (nf)
5762 nfsd_file_put(nf);
5763
5764 status = nfserrno(nfsd_open_break_lease(cur_fh->fh_dentry->d_inode,
5765 access));
5766 if (status)
5767 goto out_put_access;
5768
5769 status = nfsd4_truncate(rqstp, cur_fh, open);
5770 if (status)
5771 goto out_put_access;
5772 out:
5773 return status;
5774 out_put_access:
5775 stp->st_access_bmap = old_access_bmap;
5776 nfs4_file_put_access(fp, open->op_share_access);
5777 reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
5778 goto out;
5779 }
5780
5781 static __be32
nfs4_upgrade_open(struct svc_rqst * rqstp,struct nfs4_file * fp,struct svc_fh * cur_fh,struct nfs4_ol_stateid * stp,struct nfsd4_open * open)5782 nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp,
5783 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
5784 struct nfsd4_open *open)
5785 {
5786 __be32 status;
5787 unsigned char old_deny_bmap = stp->st_deny_bmap;
5788
5789 if (!test_access(open->op_share_access, stp))
5790 return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open, false);
5791
5792 /* test and set deny mode */
5793 spin_lock(&fp->fi_lock);
5794 status = nfs4_file_check_deny(fp, open->op_share_deny);
5795 switch (status) {
5796 case nfs_ok:
5797 set_deny(open->op_share_deny, stp);
5798 fp->fi_share_deny |=
5799 (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
5800 break;
5801 case nfserr_share_denied:
5802 if (nfs4_resolve_deny_conflicts_locked(fp, false,
5803 stp, open->op_share_deny, false))
5804 status = nfserr_jukebox;
5805 break;
5806 }
5807 spin_unlock(&fp->fi_lock);
5808
5809 if (status != nfs_ok)
5810 return status;
5811
5812 status = nfsd4_truncate(rqstp, cur_fh, open);
5813 if (status != nfs_ok)
5814 reset_union_bmap_deny(old_deny_bmap, stp);
5815 return status;
5816 }
5817
5818 /* Should we give out recallable state?: */
nfsd4_cb_channel_good(struct nfs4_client * clp)5819 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
5820 {
5821 if (clp->cl_cb_state == NFSD4_CB_UP)
5822 return true;
5823 /*
5824 * In the sessions case, since we don't have to establish a
5825 * separate connection for callbacks, we assume it's OK
5826 * until we hear otherwise:
5827 */
5828 return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
5829 }
5830
nfs4_alloc_init_lease(struct nfs4_delegation * dp)5831 static struct file_lease *nfs4_alloc_init_lease(struct nfs4_delegation *dp)
5832 {
5833 struct file_lease *fl;
5834
5835 fl = locks_alloc_lease();
5836 if (!fl)
5837 return NULL;
5838 fl->fl_lmops = &nfsd_lease_mng_ops;
5839 fl->c.flc_flags = FL_DELEG;
5840 fl->c.flc_type = deleg_is_read(dp->dl_type) ? F_RDLCK : F_WRLCK;
5841 fl->c.flc_owner = (fl_owner_t)dp;
5842 fl->c.flc_pid = current->tgid;
5843 fl->c.flc_file = dp->dl_stid.sc_file->fi_deleg_file->nf_file;
5844 return fl;
5845 }
5846
nfsd4_check_conflicting_opens(struct nfs4_client * clp,struct nfs4_file * fp)5847 static int nfsd4_check_conflicting_opens(struct nfs4_client *clp,
5848 struct nfs4_file *fp)
5849 {
5850 struct nfs4_ol_stateid *st;
5851 struct file *f = fp->fi_deleg_file->nf_file;
5852 struct inode *ino = file_inode(f);
5853 int writes;
5854
5855 writes = atomic_read(&ino->i_writecount);
5856 if (!writes)
5857 return 0;
5858 /*
5859 * There could be multiple filehandles (hence multiple
5860 * nfs4_files) referencing this file, but that's not too
5861 * common; let's just give up in that case rather than
5862 * trying to go look up all the clients using that other
5863 * nfs4_file as well:
5864 */
5865 if (fp->fi_aliased)
5866 return -EAGAIN;
5867 /*
5868 * If there's a close in progress, make sure that we see it
5869 * clear any fi_fds[] entries before we see it decrement
5870 * i_writecount:
5871 */
5872 smp_mb__after_atomic();
5873
5874 if (fp->fi_fds[O_WRONLY])
5875 writes--;
5876 if (fp->fi_fds[O_RDWR])
5877 writes--;
5878 if (writes > 0)
5879 return -EAGAIN; /* There may be non-NFSv4 writers */
5880 /*
5881 * It's possible there are non-NFSv4 write opens in progress,
5882 * but if they haven't incremented i_writecount yet then they
5883 * also haven't called break lease yet; so, they'll break this
5884 * lease soon enough. So, all that's left to check for is NFSv4
5885 * opens:
5886 */
5887 spin_lock(&fp->fi_lock);
5888 list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
5889 if (st->st_openstp == NULL /* it's an open */ &&
5890 access_permit_write(st) &&
5891 st->st_stid.sc_client != clp) {
5892 spin_unlock(&fp->fi_lock);
5893 return -EAGAIN;
5894 }
5895 }
5896 spin_unlock(&fp->fi_lock);
5897 /*
5898 * There's a small chance that we could be racing with another
5899 * NFSv4 open. However, any open that hasn't added itself to
5900 * the fi_stateids list also hasn't called break_lease yet; so,
5901 * they'll break this lease soon enough.
5902 */
5903 return 0;
5904 }
5905
5906 /*
5907 * It's possible that between opening the dentry and setting the delegation,
5908 * that it has been renamed or unlinked. Redo the lookup to verify that this
5909 * hasn't happened.
5910 */
5911 static int
nfsd4_verify_deleg_dentry(struct nfsd4_open * open,struct nfs4_file * fp,struct svc_fh * parent)5912 nfsd4_verify_deleg_dentry(struct nfsd4_open *open, struct nfs4_file *fp,
5913 struct svc_fh *parent)
5914 {
5915 struct svc_export *exp;
5916 struct dentry *child;
5917 __be32 err;
5918
5919 err = nfsd_lookup_dentry(open->op_rqstp, parent,
5920 open->op_fname, open->op_fnamelen,
5921 &exp, &child);
5922
5923 if (err)
5924 return -EAGAIN;
5925
5926 exp_put(exp);
5927 dput(child);
5928 if (child != file_dentry(fp->fi_deleg_file->nf_file))
5929 return -EAGAIN;
5930
5931 return 0;
5932 }
5933
5934 /*
5935 * We avoid breaking delegations held by a client due to its own activity, but
5936 * clearing setuid/setgid bits on a write is an implicit activity and the client
5937 * may not notice and continue using the old mode. Avoid giving out a delegation
5938 * on setuid/setgid files when the client is requesting an open for write.
5939 */
5940 static int
nfsd4_verify_setuid_write(struct nfsd4_open * open,struct nfsd_file * nf)5941 nfsd4_verify_setuid_write(struct nfsd4_open *open, struct nfsd_file *nf)
5942 {
5943 struct inode *inode = file_inode(nf->nf_file);
5944
5945 if ((open->op_share_access & NFS4_SHARE_ACCESS_WRITE) &&
5946 (inode->i_mode & (S_ISUID|S_ISGID)))
5947 return -EAGAIN;
5948 return 0;
5949 }
5950
5951 static struct nfs4_delegation *
nfs4_set_delegation(struct nfsd4_open * open,struct nfs4_ol_stateid * stp,struct svc_fh * parent)5952 nfs4_set_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp,
5953 struct svc_fh *parent)
5954 {
5955 bool deleg_ts = open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_DELEG_TIMESTAMPS;
5956 struct nfs4_client *clp = stp->st_stid.sc_client;
5957 struct nfs4_file *fp = stp->st_stid.sc_file;
5958 struct nfs4_clnt_odstate *odstate = stp->st_clnt_odstate;
5959 struct nfs4_delegation *dp;
5960 struct nfsd_file *nf = NULL;
5961 struct file_lease *fl;
5962 int status = 0;
5963 u32 dl_type;
5964
5965 /*
5966 * The fi_had_conflict and nfs_get_existing_delegation checks
5967 * here are just optimizations; we'll need to recheck them at
5968 * the end:
5969 */
5970 if (fp->fi_had_conflict)
5971 return ERR_PTR(-EAGAIN);
5972
5973 /*
5974 * Try for a write delegation first. RFC8881 section 10.4 says:
5975 *
5976 * "An OPEN_DELEGATE_WRITE delegation allows the client to handle,
5977 * on its own, all opens."
5978 *
5979 * Furthermore the client can use a write delegation for most READ
5980 * operations as well, so we require a O_RDWR file here.
5981 *
5982 * Offer a write delegation in the case of a BOTH open, and ensure
5983 * we get the O_RDWR descriptor.
5984 */
5985 if ((open->op_share_access & NFS4_SHARE_ACCESS_BOTH) == NFS4_SHARE_ACCESS_BOTH) {
5986 nf = find_rw_file(fp);
5987 dl_type = deleg_ts ? OPEN_DELEGATE_WRITE_ATTRS_DELEG : OPEN_DELEGATE_WRITE;
5988 }
5989
5990 /*
5991 * If the file is being opened O_RDONLY or we couldn't get a O_RDWR
5992 * file for some reason, then try for a read delegation instead.
5993 */
5994 if (!nf && (open->op_share_access & NFS4_SHARE_ACCESS_READ)) {
5995 nf = find_readable_file(fp);
5996 dl_type = deleg_ts ? OPEN_DELEGATE_READ_ATTRS_DELEG : OPEN_DELEGATE_READ;
5997 }
5998
5999 if (!nf)
6000 return ERR_PTR(-EAGAIN);
6001
6002 spin_lock(&state_lock);
6003 spin_lock(&fp->fi_lock);
6004 if (nfs4_delegation_exists(clp, fp))
6005 status = -EAGAIN;
6006 else if (nfsd4_verify_setuid_write(open, nf))
6007 status = -EAGAIN;
6008 else if (!fp->fi_deleg_file) {
6009 fp->fi_deleg_file = nf;
6010 /* increment early to prevent fi_deleg_file from being
6011 * cleared */
6012 fp->fi_delegees = 1;
6013 nf = NULL;
6014 } else
6015 fp->fi_delegees++;
6016 spin_unlock(&fp->fi_lock);
6017 spin_unlock(&state_lock);
6018 if (nf)
6019 nfsd_file_put(nf);
6020 if (status)
6021 return ERR_PTR(status);
6022
6023 status = -ENOMEM;
6024 dp = alloc_init_deleg(clp, fp, odstate, dl_type);
6025 if (!dp)
6026 goto out_delegees;
6027
6028 fl = nfs4_alloc_init_lease(dp);
6029 if (!fl)
6030 goto out_clnt_odstate;
6031
6032 status = kernel_setlease(fp->fi_deleg_file->nf_file,
6033 fl->c.flc_type, &fl, NULL);
6034 if (fl)
6035 locks_free_lease(fl);
6036 if (status)
6037 goto out_clnt_odstate;
6038
6039 if (parent) {
6040 status = nfsd4_verify_deleg_dentry(open, fp, parent);
6041 if (status)
6042 goto out_unlock;
6043 }
6044
6045 status = nfsd4_check_conflicting_opens(clp, fp);
6046 if (status)
6047 goto out_unlock;
6048
6049 /*
6050 * Now that the deleg is set, check again to ensure that nothing
6051 * raced in and changed the mode while we weren't looking.
6052 */
6053 status = nfsd4_verify_setuid_write(open, fp->fi_deleg_file);
6054 if (status)
6055 goto out_unlock;
6056
6057 status = -EAGAIN;
6058 if (fp->fi_had_conflict)
6059 goto out_unlock;
6060
6061 spin_lock(&state_lock);
6062 spin_lock(&clp->cl_lock);
6063 spin_lock(&fp->fi_lock);
6064 status = hash_delegation_locked(dp, fp);
6065 spin_unlock(&fp->fi_lock);
6066 spin_unlock(&clp->cl_lock);
6067 spin_unlock(&state_lock);
6068
6069 if (status)
6070 goto out_unlock;
6071
6072 return dp;
6073 out_unlock:
6074 kernel_setlease(fp->fi_deleg_file->nf_file, F_UNLCK, NULL, (void **)&dp);
6075 out_clnt_odstate:
6076 put_clnt_odstate(dp->dl_clnt_odstate);
6077 nfs4_put_stid(&dp->dl_stid);
6078 out_delegees:
6079 put_deleg_file(fp);
6080 return ERR_PTR(status);
6081 }
6082
nfsd4_open_deleg_none_ext(struct nfsd4_open * open,int status)6083 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
6084 {
6085 open->op_delegate_type = OPEN_DELEGATE_NONE_EXT;
6086 if (status == -EAGAIN)
6087 open->op_why_no_deleg = WND4_CONTENTION;
6088 else {
6089 open->op_why_no_deleg = WND4_RESOURCE;
6090 switch (open->op_deleg_want) {
6091 case OPEN4_SHARE_ACCESS_WANT_READ_DELEG:
6092 case OPEN4_SHARE_ACCESS_WANT_WRITE_DELEG:
6093 case OPEN4_SHARE_ACCESS_WANT_ANY_DELEG:
6094 break;
6095 case OPEN4_SHARE_ACCESS_WANT_CANCEL:
6096 open->op_why_no_deleg = WND4_CANCELLED;
6097 break;
6098 case OPEN4_SHARE_ACCESS_WANT_NO_DELEG:
6099 WARN_ON_ONCE(1);
6100 }
6101 }
6102 }
6103
6104 static bool
nfs4_delegation_stat(struct nfs4_delegation * dp,struct svc_fh * currentfh,struct kstat * stat)6105 nfs4_delegation_stat(struct nfs4_delegation *dp, struct svc_fh *currentfh,
6106 struct kstat *stat)
6107 {
6108 struct nfsd_file *nf = find_rw_file(dp->dl_stid.sc_file);
6109 struct path path;
6110 int rc;
6111
6112 if (!nf)
6113 return false;
6114
6115 path.mnt = currentfh->fh_export->ex_path.mnt;
6116 path.dentry = file_dentry(nf->nf_file);
6117
6118 rc = vfs_getattr(&path, stat,
6119 (STATX_MODE | STATX_SIZE | STATX_CTIME | STATX_CHANGE_COOKIE),
6120 AT_STATX_SYNC_AS_STAT);
6121
6122 nfsd_file_put(nf);
6123 return rc == 0;
6124 }
6125
6126 /*
6127 * The Linux NFS server does not offer write delegations to NFSv4.0
6128 * clients in order to avoid conflicts between write delegations and
6129 * GETATTRs requesting CHANGE or SIZE attributes.
6130 *
6131 * With NFSv4.1 and later minorversions, the SEQUENCE operation that
6132 * begins each COMPOUND contains a client ID. Delegation recall can
6133 * be avoided when the server recognizes the client sending a
6134 * GETATTR also holds write delegation it conflicts with.
6135 *
6136 * However, the NFSv4.0 protocol does not enable a server to
6137 * determine that a GETATTR originated from the client holding the
6138 * conflicting delegation versus coming from some other client. Per
6139 * RFC 7530 Section 16.7.5, the server must recall or send a
6140 * CB_GETATTR even when the GETATTR originates from the client that
6141 * holds the conflicting delegation.
6142 *
6143 * An NFSv4.0 client can trigger a pathological situation if it
6144 * always sends a DELEGRETURN preceded by a conflicting GETATTR in
6145 * the same COMPOUND. COMPOUND execution will always stop at the
6146 * GETATTR and the DELEGRETURN will never get executed. The server
6147 * eventually revokes the delegation, which can result in loss of
6148 * open or lock state.
6149 */
6150 static void
nfs4_open_delegation(struct nfsd4_open * open,struct nfs4_ol_stateid * stp,struct svc_fh * currentfh)6151 nfs4_open_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp,
6152 struct svc_fh *currentfh)
6153 {
6154 bool deleg_ts = open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_DELEG_TIMESTAMPS;
6155 struct nfs4_openowner *oo = openowner(stp->st_stateowner);
6156 struct nfs4_client *clp = stp->st_stid.sc_client;
6157 struct svc_fh *parent = NULL;
6158 struct nfs4_delegation *dp;
6159 struct kstat stat;
6160 int status = 0;
6161 int cb_up;
6162
6163 cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
6164 open->op_recall = false;
6165 switch (open->op_claim_type) {
6166 case NFS4_OPEN_CLAIM_PREVIOUS:
6167 if (!cb_up)
6168 open->op_recall = true;
6169 break;
6170 case NFS4_OPEN_CLAIM_NULL:
6171 parent = currentfh;
6172 fallthrough;
6173 case NFS4_OPEN_CLAIM_FH:
6174 /*
6175 * Let's not give out any delegations till everyone's
6176 * had the chance to reclaim theirs, *and* until
6177 * NLM locks have all been reclaimed:
6178 */
6179 if (locks_in_grace(clp->net))
6180 goto out_no_deleg;
6181 if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
6182 goto out_no_deleg;
6183 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE &&
6184 !clp->cl_minorversion)
6185 goto out_no_deleg;
6186 break;
6187 default:
6188 goto out_no_deleg;
6189 }
6190 dp = nfs4_set_delegation(open, stp, parent);
6191 if (IS_ERR(dp))
6192 goto out_no_deleg;
6193
6194 memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
6195
6196 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) {
6197 if (!nfs4_delegation_stat(dp, currentfh, &stat)) {
6198 nfs4_put_stid(&dp->dl_stid);
6199 destroy_delegation(dp);
6200 goto out_no_deleg;
6201 }
6202 open->op_delegate_type = deleg_ts ? OPEN_DELEGATE_WRITE_ATTRS_DELEG :
6203 OPEN_DELEGATE_WRITE;
6204 dp->dl_cb_fattr.ncf_cur_fsize = stat.size;
6205 dp->dl_cb_fattr.ncf_initial_cinfo = nfsd4_change_attribute(&stat);
6206 trace_nfsd_deleg_write(&dp->dl_stid.sc_stateid);
6207 } else {
6208 open->op_delegate_type = deleg_ts ? OPEN_DELEGATE_READ_ATTRS_DELEG :
6209 OPEN_DELEGATE_READ;
6210 trace_nfsd_deleg_read(&dp->dl_stid.sc_stateid);
6211 }
6212 nfs4_put_stid(&dp->dl_stid);
6213 return;
6214 out_no_deleg:
6215 open->op_delegate_type = OPEN_DELEGATE_NONE;
6216 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
6217 open->op_delegate_type != OPEN_DELEGATE_NONE) {
6218 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
6219 open->op_recall = true;
6220 }
6221
6222 /* 4.1 client asking for a delegation? */
6223 if (open->op_deleg_want)
6224 nfsd4_open_deleg_none_ext(open, status);
6225 return;
6226 }
6227
nfsd4_deleg_xgrade_none_ext(struct nfsd4_open * open,struct nfs4_delegation * dp)6228 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
6229 struct nfs4_delegation *dp)
6230 {
6231 if (deleg_is_write(dp->dl_type)) {
6232 if (open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_READ_DELEG) {
6233 open->op_delegate_type = OPEN_DELEGATE_NONE_EXT;
6234 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
6235 } else if (open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_WRITE_DELEG) {
6236 open->op_delegate_type = OPEN_DELEGATE_NONE_EXT;
6237 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
6238 }
6239 }
6240 /* Otherwise the client must be confused wanting a delegation
6241 * it already has, therefore we don't return
6242 * OPEN_DELEGATE_NONE_EXT and reason.
6243 */
6244 }
6245
6246 /* Are we returning only a delegation stateid? */
open_xor_delegation(struct nfsd4_open * open)6247 static bool open_xor_delegation(struct nfsd4_open *open)
6248 {
6249 if (!(open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_OPEN_XOR_DELEGATION))
6250 return false;
6251 /* Did we actually get a delegation? */
6252 if (!deleg_is_read(open->op_delegate_type) && !deleg_is_write(open->op_delegate_type))
6253 return false;
6254 return true;
6255 }
6256
6257 /**
6258 * nfsd4_process_open2 - finish open processing
6259 * @rqstp: the RPC transaction being executed
6260 * @current_fh: NFSv4 COMPOUND's current filehandle
6261 * @open: OPEN arguments
6262 *
6263 * If successful, (1) truncate the file if open->op_truncate was
6264 * set, (2) set open->op_stateid, (3) set open->op_delegation.
6265 *
6266 * Returns %nfs_ok on success; otherwise an nfs4stat value in
6267 * network byte order is returned.
6268 */
6269 __be32
nfsd4_process_open2(struct svc_rqst * rqstp,struct svc_fh * current_fh,struct nfsd4_open * open)6270 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
6271 {
6272 struct nfsd4_compoundres *resp = rqstp->rq_resp;
6273 struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
6274 struct nfs4_file *fp = NULL;
6275 struct nfs4_ol_stateid *stp = NULL;
6276 struct nfs4_delegation *dp = NULL;
6277 __be32 status;
6278 bool new_stp = false;
6279
6280 /*
6281 * Lookup file; if found, lookup stateid and check open request,
6282 * and check for delegations in the process of being recalled.
6283 * If not found, create the nfs4_file struct
6284 */
6285 fp = nfsd4_file_hash_insert(open->op_file, current_fh);
6286 if (unlikely(!fp))
6287 return nfserr_jukebox;
6288 if (fp != open->op_file) {
6289 status = nfs4_check_deleg(cl, open, &dp);
6290 if (status)
6291 goto out;
6292 stp = nfsd4_find_and_lock_existing_open(fp, open);
6293 } else {
6294 open->op_file = NULL;
6295 status = nfserr_bad_stateid;
6296 if (nfsd4_is_deleg_cur(open))
6297 goto out;
6298 }
6299
6300 if (!stp) {
6301 stp = init_open_stateid(fp, open);
6302 if (!stp) {
6303 status = nfserr_jukebox;
6304 goto out;
6305 }
6306
6307 if (!open->op_stp)
6308 new_stp = true;
6309 }
6310
6311 /*
6312 * OPEN the file, or upgrade an existing OPEN.
6313 * If truncate fails, the OPEN fails.
6314 *
6315 * stp is already locked.
6316 */
6317 if (!new_stp) {
6318 /* Stateid was found, this is an OPEN upgrade */
6319 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
6320 if (status) {
6321 mutex_unlock(&stp->st_mutex);
6322 goto out;
6323 }
6324 } else {
6325 status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open, true);
6326 if (status) {
6327 release_open_stateid(stp);
6328 mutex_unlock(&stp->st_mutex);
6329 goto out;
6330 }
6331
6332 stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
6333 open->op_odstate);
6334 if (stp->st_clnt_odstate == open->op_odstate)
6335 open->op_odstate = NULL;
6336 }
6337
6338 nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
6339 mutex_unlock(&stp->st_mutex);
6340
6341 if (nfsd4_has_session(&resp->cstate)) {
6342 if (open->op_deleg_want & OPEN4_SHARE_ACCESS_WANT_NO_DELEG) {
6343 open->op_delegate_type = OPEN_DELEGATE_NONE_EXT;
6344 open->op_why_no_deleg = WND4_NOT_WANTED;
6345 goto nodeleg;
6346 }
6347 }
6348
6349 /*
6350 * Attempt to hand out a delegation. No error return, because the
6351 * OPEN succeeds even if we fail.
6352 */
6353 nfs4_open_delegation(open, stp, &resp->cstate.current_fh);
6354
6355 /*
6356 * If there is an existing open stateid, it must be updated and
6357 * returned. Only respect WANT_OPEN_XOR_DELEGATION when a new
6358 * open stateid would have to be created.
6359 */
6360 if (new_stp && open_xor_delegation(open)) {
6361 memcpy(&open->op_stateid, &zero_stateid, sizeof(open->op_stateid));
6362 open->op_rflags |= OPEN4_RESULT_NO_OPEN_STATEID;
6363 release_open_stateid(stp);
6364 }
6365 nodeleg:
6366 status = nfs_ok;
6367 trace_nfsd_open(&stp->st_stid.sc_stateid);
6368 out:
6369 /* 4.1 client trying to upgrade/downgrade delegation? */
6370 if (open->op_delegate_type == OPEN_DELEGATE_NONE && dp &&
6371 open->op_deleg_want)
6372 nfsd4_deleg_xgrade_none_ext(open, dp);
6373
6374 if (fp)
6375 put_nfs4_file(fp);
6376 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
6377 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
6378 /*
6379 * To finish the open response, we just need to set the rflags.
6380 */
6381 open->op_rflags |= NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
6382 if (nfsd4_has_session(&resp->cstate))
6383 open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
6384 else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
6385 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
6386
6387 if (dp)
6388 nfs4_put_stid(&dp->dl_stid);
6389 if (stp)
6390 nfs4_put_stid(&stp->st_stid);
6391
6392 return status;
6393 }
6394
nfsd4_cleanup_open_state(struct nfsd4_compound_state * cstate,struct nfsd4_open * open)6395 void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
6396 struct nfsd4_open *open)
6397 {
6398 if (open->op_openowner)
6399 nfs4_put_stateowner(&open->op_openowner->oo_owner);
6400 if (open->op_file)
6401 kmem_cache_free(file_slab, open->op_file);
6402 if (open->op_stp)
6403 nfs4_put_stid(&open->op_stp->st_stid);
6404 if (open->op_odstate)
6405 kmem_cache_free(odstate_slab, open->op_odstate);
6406 }
6407
6408 __be32
nfsd4_renew(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)6409 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6410 union nfsd4_op_u *u)
6411 {
6412 clientid_t *clid = &u->renew;
6413 struct nfs4_client *clp;
6414 __be32 status;
6415 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6416
6417 trace_nfsd_clid_renew(clid);
6418 status = set_client(clid, cstate, nn);
6419 if (status)
6420 return status;
6421 clp = cstate->clp;
6422 if (!list_empty(&clp->cl_delegations)
6423 && clp->cl_cb_state != NFSD4_CB_UP)
6424 return nfserr_cb_path_down;
6425 return nfs_ok;
6426 }
6427
6428 void
nfsd4_end_grace(struct nfsd_net * nn)6429 nfsd4_end_grace(struct nfsd_net *nn)
6430 {
6431 /* do nothing if grace period already ended */
6432 if (nn->grace_ended)
6433 return;
6434
6435 trace_nfsd_grace_complete(nn);
6436 nn->grace_ended = true;
6437 /*
6438 * If the server goes down again right now, an NFSv4
6439 * client will still be allowed to reclaim after it comes back up,
6440 * even if it hasn't yet had a chance to reclaim state this time.
6441 *
6442 */
6443 nfsd4_record_grace_done(nn);
6444 /*
6445 * At this point, NFSv4 clients can still reclaim. But if the
6446 * server crashes, any that have not yet reclaimed will be out
6447 * of luck on the next boot.
6448 *
6449 * (NFSv4.1+ clients are considered to have reclaimed once they
6450 * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
6451 * have reclaimed after their first OPEN.)
6452 */
6453 locks_end_grace(&nn->nfsd4_manager);
6454 /*
6455 * At this point, and once lockd and/or any other containers
6456 * exit their grace period, further reclaims will fail and
6457 * regular locking can resume.
6458 */
6459 }
6460
6461 /*
6462 * If we've waited a lease period but there are still clients trying to
6463 * reclaim, wait a little longer to give them a chance to finish.
6464 */
clients_still_reclaiming(struct nfsd_net * nn)6465 static bool clients_still_reclaiming(struct nfsd_net *nn)
6466 {
6467 time64_t double_grace_period_end = nn->boot_time +
6468 2 * nn->nfsd4_lease;
6469
6470 if (nn->track_reclaim_completes &&
6471 atomic_read(&nn->nr_reclaim_complete) ==
6472 nn->reclaim_str_hashtbl_size)
6473 return false;
6474 if (!nn->somebody_reclaimed)
6475 return false;
6476 nn->somebody_reclaimed = false;
6477 /*
6478 * If we've given them *two* lease times to reclaim, and they're
6479 * still not done, give up:
6480 */
6481 if (ktime_get_boottime_seconds() > double_grace_period_end)
6482 return false;
6483 return true;
6484 }
6485
6486 struct laundry_time {
6487 time64_t cutoff;
6488 time64_t new_timeo;
6489 };
6490
state_expired(struct laundry_time * lt,time64_t last_refresh)6491 static bool state_expired(struct laundry_time *lt, time64_t last_refresh)
6492 {
6493 time64_t time_remaining;
6494
6495 if (last_refresh < lt->cutoff)
6496 return true;
6497 time_remaining = last_refresh - lt->cutoff;
6498 lt->new_timeo = min(lt->new_timeo, time_remaining);
6499 return false;
6500 }
6501
6502 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
nfsd4_ssc_init_umount_work(struct nfsd_net * nn)6503 void nfsd4_ssc_init_umount_work(struct nfsd_net *nn)
6504 {
6505 spin_lock_init(&nn->nfsd_ssc_lock);
6506 INIT_LIST_HEAD(&nn->nfsd_ssc_mount_list);
6507 init_waitqueue_head(&nn->nfsd_ssc_waitq);
6508 }
6509
6510 /*
6511 * This is called when nfsd is being shutdown, after all inter_ssc
6512 * cleanup were done, to destroy the ssc delayed unmount list.
6513 */
nfsd4_ssc_shutdown_umount(struct nfsd_net * nn)6514 static void nfsd4_ssc_shutdown_umount(struct nfsd_net *nn)
6515 {
6516 struct nfsd4_ssc_umount_item *ni = NULL;
6517 struct nfsd4_ssc_umount_item *tmp;
6518
6519 spin_lock(&nn->nfsd_ssc_lock);
6520 list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
6521 list_del(&ni->nsui_list);
6522 spin_unlock(&nn->nfsd_ssc_lock);
6523 mntput(ni->nsui_vfsmount);
6524 kfree(ni);
6525 spin_lock(&nn->nfsd_ssc_lock);
6526 }
6527 spin_unlock(&nn->nfsd_ssc_lock);
6528 }
6529
nfsd4_ssc_expire_umount(struct nfsd_net * nn)6530 static void nfsd4_ssc_expire_umount(struct nfsd_net *nn)
6531 {
6532 bool do_wakeup = false;
6533 struct nfsd4_ssc_umount_item *ni = NULL;
6534 struct nfsd4_ssc_umount_item *tmp;
6535
6536 spin_lock(&nn->nfsd_ssc_lock);
6537 list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
6538 if (time_after(jiffies, ni->nsui_expire)) {
6539 if (refcount_read(&ni->nsui_refcnt) > 1)
6540 continue;
6541
6542 /* mark being unmount */
6543 ni->nsui_busy = true;
6544 spin_unlock(&nn->nfsd_ssc_lock);
6545 mntput(ni->nsui_vfsmount);
6546 spin_lock(&nn->nfsd_ssc_lock);
6547
6548 /* waiters need to start from begin of list */
6549 list_del(&ni->nsui_list);
6550 kfree(ni);
6551
6552 /* wakeup ssc_connect waiters */
6553 do_wakeup = true;
6554 continue;
6555 }
6556 break;
6557 }
6558 if (do_wakeup)
6559 wake_up_all(&nn->nfsd_ssc_waitq);
6560 spin_unlock(&nn->nfsd_ssc_lock);
6561 }
6562 #endif
6563
6564 /* Check if any lock belonging to this lockowner has any blockers */
6565 static bool
nfs4_lockowner_has_blockers(struct nfs4_lockowner * lo)6566 nfs4_lockowner_has_blockers(struct nfs4_lockowner *lo)
6567 {
6568 struct file_lock_context *ctx;
6569 struct nfs4_ol_stateid *stp;
6570 struct nfs4_file *nf;
6571
6572 list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) {
6573 nf = stp->st_stid.sc_file;
6574 ctx = locks_inode_context(nf->fi_inode);
6575 if (!ctx)
6576 continue;
6577 if (locks_owner_has_blockers(ctx, lo))
6578 return true;
6579 }
6580 return false;
6581 }
6582
6583 static bool
nfs4_anylock_blockers(struct nfs4_client * clp)6584 nfs4_anylock_blockers(struct nfs4_client *clp)
6585 {
6586 int i;
6587 struct nfs4_stateowner *so;
6588 struct nfs4_lockowner *lo;
6589
6590 if (atomic_read(&clp->cl_delegs_in_recall))
6591 return true;
6592 spin_lock(&clp->cl_lock);
6593 for (i = 0; i < OWNER_HASH_SIZE; i++) {
6594 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[i],
6595 so_strhash) {
6596 if (so->so_is_open_owner)
6597 continue;
6598 lo = lockowner(so);
6599 if (nfs4_lockowner_has_blockers(lo)) {
6600 spin_unlock(&clp->cl_lock);
6601 return true;
6602 }
6603 }
6604 }
6605 spin_unlock(&clp->cl_lock);
6606 return false;
6607 }
6608
6609 static void
nfs4_get_client_reaplist(struct nfsd_net * nn,struct list_head * reaplist,struct laundry_time * lt)6610 nfs4_get_client_reaplist(struct nfsd_net *nn, struct list_head *reaplist,
6611 struct laundry_time *lt)
6612 {
6613 unsigned int maxreap, reapcnt = 0;
6614 struct list_head *pos, *next;
6615 struct nfs4_client *clp;
6616
6617 maxreap = (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients) ?
6618 NFSD_CLIENT_MAX_TRIM_PER_RUN : 0;
6619 INIT_LIST_HEAD(reaplist);
6620 spin_lock(&nn->client_lock);
6621 list_for_each_safe(pos, next, &nn->client_lru) {
6622 clp = list_entry(pos, struct nfs4_client, cl_lru);
6623 if (clp->cl_state == NFSD4_EXPIRABLE)
6624 goto exp_client;
6625 if (!state_expired(lt, clp->cl_time))
6626 break;
6627 if (!atomic_read(&clp->cl_rpc_users)) {
6628 if (clp->cl_state == NFSD4_ACTIVE)
6629 atomic_inc(&nn->nfsd_courtesy_clients);
6630 clp->cl_state = NFSD4_COURTESY;
6631 }
6632 if (!client_has_state(clp))
6633 goto exp_client;
6634 if (!nfs4_anylock_blockers(clp))
6635 if (reapcnt >= maxreap)
6636 continue;
6637 exp_client:
6638 if (!mark_client_expired_locked(clp)) {
6639 list_add(&clp->cl_lru, reaplist);
6640 reapcnt++;
6641 }
6642 }
6643 spin_unlock(&nn->client_lock);
6644 }
6645
6646 static void
nfs4_get_courtesy_client_reaplist(struct nfsd_net * nn,struct list_head * reaplist)6647 nfs4_get_courtesy_client_reaplist(struct nfsd_net *nn,
6648 struct list_head *reaplist)
6649 {
6650 unsigned int maxreap = 0, reapcnt = 0;
6651 struct list_head *pos, *next;
6652 struct nfs4_client *clp;
6653
6654 maxreap = NFSD_CLIENT_MAX_TRIM_PER_RUN;
6655 INIT_LIST_HEAD(reaplist);
6656
6657 spin_lock(&nn->client_lock);
6658 list_for_each_safe(pos, next, &nn->client_lru) {
6659 clp = list_entry(pos, struct nfs4_client, cl_lru);
6660 if (clp->cl_state == NFSD4_ACTIVE)
6661 break;
6662 if (reapcnt >= maxreap)
6663 break;
6664 if (!mark_client_expired_locked(clp)) {
6665 list_add(&clp->cl_lru, reaplist);
6666 reapcnt++;
6667 }
6668 }
6669 spin_unlock(&nn->client_lock);
6670 }
6671
6672 static void
nfs4_process_client_reaplist(struct list_head * reaplist)6673 nfs4_process_client_reaplist(struct list_head *reaplist)
6674 {
6675 struct list_head *pos, *next;
6676 struct nfs4_client *clp;
6677
6678 list_for_each_safe(pos, next, reaplist) {
6679 clp = list_entry(pos, struct nfs4_client, cl_lru);
6680 trace_nfsd_clid_purged(&clp->cl_clientid);
6681 list_del_init(&clp->cl_lru);
6682 expire_client(clp);
6683 }
6684 }
6685
nfs40_clean_admin_revoked(struct nfsd_net * nn,struct laundry_time * lt)6686 static void nfs40_clean_admin_revoked(struct nfsd_net *nn,
6687 struct laundry_time *lt)
6688 {
6689 struct nfs4_client *clp;
6690
6691 spin_lock(&nn->client_lock);
6692 if (nn->nfs40_last_revoke == 0 ||
6693 nn->nfs40_last_revoke > lt->cutoff) {
6694 spin_unlock(&nn->client_lock);
6695 return;
6696 }
6697 nn->nfs40_last_revoke = 0;
6698
6699 retry:
6700 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6701 unsigned long id, tmp;
6702 struct nfs4_stid *stid;
6703
6704 if (atomic_read(&clp->cl_admin_revoked) == 0)
6705 continue;
6706
6707 spin_lock(&clp->cl_lock);
6708 idr_for_each_entry_ul(&clp->cl_stateids, stid, tmp, id)
6709 if (stid->sc_status & SC_STATUS_ADMIN_REVOKED) {
6710 refcount_inc(&stid->sc_count);
6711 spin_unlock(&nn->client_lock);
6712 /* this function drops ->cl_lock */
6713 nfsd4_drop_revoked_stid(stid);
6714 nfs4_put_stid(stid);
6715 spin_lock(&nn->client_lock);
6716 goto retry;
6717 }
6718 spin_unlock(&clp->cl_lock);
6719 }
6720 spin_unlock(&nn->client_lock);
6721 }
6722
6723 static time64_t
nfs4_laundromat(struct nfsd_net * nn)6724 nfs4_laundromat(struct nfsd_net *nn)
6725 {
6726 struct nfs4_openowner *oo;
6727 struct nfs4_delegation *dp;
6728 struct nfs4_ol_stateid *stp;
6729 struct nfsd4_blocked_lock *nbl;
6730 struct list_head *pos, *next, reaplist;
6731 struct laundry_time lt = {
6732 .cutoff = ktime_get_boottime_seconds() - nn->nfsd4_lease,
6733 .new_timeo = nn->nfsd4_lease
6734 };
6735 struct nfs4_cpntf_state *cps;
6736 copy_stateid_t *cps_t;
6737 int i;
6738
6739 if (clients_still_reclaiming(nn)) {
6740 lt.new_timeo = 0;
6741 goto out;
6742 }
6743 nfsd4_end_grace(nn);
6744
6745 spin_lock(&nn->s2s_cp_lock);
6746 idr_for_each_entry(&nn->s2s_cp_stateids, cps_t, i) {
6747 cps = container_of(cps_t, struct nfs4_cpntf_state, cp_stateid);
6748 if (cps->cp_stateid.cs_type == NFS4_COPYNOTIFY_STID &&
6749 state_expired(<, cps->cpntf_time))
6750 _free_cpntf_state_locked(nn, cps);
6751 }
6752 spin_unlock(&nn->s2s_cp_lock);
6753 nfsd4_async_copy_reaper(nn);
6754 nfs4_get_client_reaplist(nn, &reaplist, <);
6755 nfs4_process_client_reaplist(&reaplist);
6756
6757 nfs40_clean_admin_revoked(nn, <);
6758
6759 spin_lock(&state_lock);
6760 list_for_each_safe(pos, next, &nn->del_recall_lru) {
6761 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
6762 if (!state_expired(<, dp->dl_time))
6763 break;
6764 refcount_inc(&dp->dl_stid.sc_count);
6765 unhash_delegation_locked(dp, SC_STATUS_REVOKED);
6766 list_add(&dp->dl_recall_lru, &reaplist);
6767 }
6768 spin_unlock(&state_lock);
6769 while (!list_empty(&reaplist)) {
6770 dp = list_first_entry(&reaplist, struct nfs4_delegation,
6771 dl_recall_lru);
6772 list_del_init(&dp->dl_recall_lru);
6773 revoke_delegation(dp);
6774 }
6775
6776 spin_lock(&nn->client_lock);
6777 while (!list_empty(&nn->close_lru)) {
6778 oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
6779 oo_close_lru);
6780 if (!state_expired(<, oo->oo_time))
6781 break;
6782 list_del_init(&oo->oo_close_lru);
6783 stp = oo->oo_last_closed_stid;
6784 oo->oo_last_closed_stid = NULL;
6785 spin_unlock(&nn->client_lock);
6786 nfs4_put_stid(&stp->st_stid);
6787 spin_lock(&nn->client_lock);
6788 }
6789 spin_unlock(&nn->client_lock);
6790
6791 /*
6792 * It's possible for a client to try and acquire an already held lock
6793 * that is being held for a long time, and then lose interest in it.
6794 * So, we clean out any un-revisited request after a lease period
6795 * under the assumption that the client is no longer interested.
6796 *
6797 * RFC5661, sec. 9.6 states that the client must not rely on getting
6798 * notifications and must continue to poll for locks, even when the
6799 * server supports them. Thus this shouldn't lead to clients blocking
6800 * indefinitely once the lock does become free.
6801 */
6802 BUG_ON(!list_empty(&reaplist));
6803 spin_lock(&nn->blocked_locks_lock);
6804 while (!list_empty(&nn->blocked_locks_lru)) {
6805 nbl = list_first_entry(&nn->blocked_locks_lru,
6806 struct nfsd4_blocked_lock, nbl_lru);
6807 if (!state_expired(<, nbl->nbl_time))
6808 break;
6809 list_move(&nbl->nbl_lru, &reaplist);
6810 list_del_init(&nbl->nbl_list);
6811 }
6812 spin_unlock(&nn->blocked_locks_lock);
6813
6814 while (!list_empty(&reaplist)) {
6815 nbl = list_first_entry(&reaplist,
6816 struct nfsd4_blocked_lock, nbl_lru);
6817 list_del_init(&nbl->nbl_lru);
6818 free_blocked_lock(nbl);
6819 }
6820 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
6821 /* service the server-to-server copy delayed unmount list */
6822 nfsd4_ssc_expire_umount(nn);
6823 #endif
6824 if (atomic_long_read(&num_delegations) >= max_delegations)
6825 deleg_reaper(nn);
6826 out:
6827 return max_t(time64_t, lt.new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
6828 }
6829
6830 static void laundromat_main(struct work_struct *);
6831
6832 static void
laundromat_main(struct work_struct * laundry)6833 laundromat_main(struct work_struct *laundry)
6834 {
6835 time64_t t;
6836 struct delayed_work *dwork = to_delayed_work(laundry);
6837 struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
6838 laundromat_work);
6839
6840 t = nfs4_laundromat(nn);
6841 queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
6842 }
6843
6844 static void
courtesy_client_reaper(struct nfsd_net * nn)6845 courtesy_client_reaper(struct nfsd_net *nn)
6846 {
6847 struct list_head reaplist;
6848
6849 nfs4_get_courtesy_client_reaplist(nn, &reaplist);
6850 nfs4_process_client_reaplist(&reaplist);
6851 }
6852
6853 static void
deleg_reaper(struct nfsd_net * nn)6854 deleg_reaper(struct nfsd_net *nn)
6855 {
6856 struct list_head *pos, *next;
6857 struct nfs4_client *clp;
6858 LIST_HEAD(cblist);
6859
6860 spin_lock(&nn->client_lock);
6861 list_for_each_safe(pos, next, &nn->client_lru) {
6862 clp = list_entry(pos, struct nfs4_client, cl_lru);
6863 if (clp->cl_state != NFSD4_ACTIVE ||
6864 list_empty(&clp->cl_delegations) ||
6865 atomic_read(&clp->cl_delegs_in_recall) ||
6866 test_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags) ||
6867 (ktime_get_boottime_seconds() -
6868 clp->cl_ra_time < 5)) {
6869 continue;
6870 }
6871 list_add(&clp->cl_ra_cblist, &cblist);
6872
6873 /* release in nfsd4_cb_recall_any_release */
6874 kref_get(&clp->cl_nfsdfs.cl_ref);
6875 set_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags);
6876 clp->cl_ra_time = ktime_get_boottime_seconds();
6877 }
6878 spin_unlock(&nn->client_lock);
6879
6880 while (!list_empty(&cblist)) {
6881 clp = list_first_entry(&cblist, struct nfs4_client,
6882 cl_ra_cblist);
6883 list_del_init(&clp->cl_ra_cblist);
6884 clp->cl_ra->ra_keep = 0;
6885 clp->cl_ra->ra_bmval[0] = BIT(RCA4_TYPE_MASK_RDATA_DLG) |
6886 BIT(RCA4_TYPE_MASK_WDATA_DLG);
6887 trace_nfsd_cb_recall_any(clp->cl_ra);
6888 nfsd4_run_cb(&clp->cl_ra->ra_cb);
6889 }
6890 }
6891
6892 static void
nfsd4_state_shrinker_worker(struct work_struct * work)6893 nfsd4_state_shrinker_worker(struct work_struct *work)
6894 {
6895 struct nfsd_net *nn = container_of(work, struct nfsd_net,
6896 nfsd_shrinker_work);
6897
6898 courtesy_client_reaper(nn);
6899 deleg_reaper(nn);
6900 }
6901
nfs4_check_fh(struct svc_fh * fhp,struct nfs4_stid * stp)6902 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
6903 {
6904 if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
6905 return nfserr_bad_stateid;
6906 return nfs_ok;
6907 }
6908
6909 static
nfs4_check_openmode(struct nfs4_ol_stateid * stp,int flags)6910 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
6911 {
6912 __be32 status = nfserr_openmode;
6913
6914 /* For lock stateid's, we test the parent open, not the lock: */
6915 if (stp->st_openstp)
6916 stp = stp->st_openstp;
6917 if ((flags & WR_STATE) && !access_permit_write(stp))
6918 goto out;
6919 if ((flags & RD_STATE) && !access_permit_read(stp))
6920 goto out;
6921 status = nfs_ok;
6922 out:
6923 return status;
6924 }
6925
6926 static inline __be32
check_special_stateids(struct net * net,svc_fh * current_fh,stateid_t * stateid,int flags)6927 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
6928 {
6929 if (ONE_STATEID(stateid) && (flags & RD_STATE))
6930 return nfs_ok;
6931 else if (opens_in_grace(net)) {
6932 /* Answer in remaining cases depends on existence of
6933 * conflicting state; so we must wait out the grace period. */
6934 return nfserr_grace;
6935 } else if (flags & WR_STATE)
6936 return nfs4_share_conflict(current_fh,
6937 NFS4_SHARE_DENY_WRITE);
6938 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
6939 return nfs4_share_conflict(current_fh,
6940 NFS4_SHARE_DENY_READ);
6941 }
6942
check_stateid_generation(stateid_t * in,stateid_t * ref,bool has_session)6943 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
6944 {
6945 /*
6946 * When sessions are used the stateid generation number is ignored
6947 * when it is zero.
6948 */
6949 if (has_session && in->si_generation == 0)
6950 return nfs_ok;
6951
6952 if (in->si_generation == ref->si_generation)
6953 return nfs_ok;
6954
6955 /* If the client sends us a stateid from the future, it's buggy: */
6956 if (nfsd4_stateid_generation_after(in, ref))
6957 return nfserr_bad_stateid;
6958 /*
6959 * However, we could see a stateid from the past, even from a
6960 * non-buggy client. For example, if the client sends a lock
6961 * while some IO is outstanding, the lock may bump si_generation
6962 * while the IO is still in flight. The client could avoid that
6963 * situation by waiting for responses on all the IO requests,
6964 * but better performance may result in retrying IO that
6965 * receives an old_stateid error if requests are rarely
6966 * reordered in flight:
6967 */
6968 return nfserr_old_stateid;
6969 }
6970
nfsd4_stid_check_stateid_generation(stateid_t * in,struct nfs4_stid * s,bool has_session)6971 static __be32 nfsd4_stid_check_stateid_generation(stateid_t *in, struct nfs4_stid *s, bool has_session)
6972 {
6973 __be32 ret;
6974
6975 spin_lock(&s->sc_lock);
6976 ret = nfsd4_verify_open_stid(s);
6977 if (ret == nfs_ok)
6978 ret = check_stateid_generation(in, &s->sc_stateid, has_session);
6979 spin_unlock(&s->sc_lock);
6980 if (ret == nfserr_admin_revoked)
6981 nfsd40_drop_revoked_stid(s->sc_client,
6982 &s->sc_stateid);
6983 return ret;
6984 }
6985
nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid * ols)6986 static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
6987 {
6988 if (ols->st_stateowner->so_is_open_owner &&
6989 !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
6990 return nfserr_bad_stateid;
6991 return nfs_ok;
6992 }
6993
nfsd4_validate_stateid(struct nfs4_client * cl,stateid_t * stateid)6994 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
6995 {
6996 struct nfs4_stid *s;
6997 __be32 status = nfserr_bad_stateid;
6998
6999 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
7000 CLOSE_STATEID(stateid))
7001 return status;
7002 spin_lock(&cl->cl_lock);
7003 s = find_stateid_locked(cl, stateid);
7004 if (!s)
7005 goto out_unlock;
7006 status = nfsd4_stid_check_stateid_generation(stateid, s, 1);
7007 if (status)
7008 goto out_unlock;
7009 status = nfsd4_verify_open_stid(s);
7010 if (status)
7011 goto out_unlock;
7012
7013 switch (s->sc_type) {
7014 case SC_TYPE_DELEG:
7015 status = nfs_ok;
7016 break;
7017 case SC_TYPE_OPEN:
7018 case SC_TYPE_LOCK:
7019 status = nfsd4_check_openowner_confirmed(openlockstateid(s));
7020 break;
7021 default:
7022 printk("unknown stateid type %x\n", s->sc_type);
7023 status = nfserr_bad_stateid;
7024 }
7025 out_unlock:
7026 spin_unlock(&cl->cl_lock);
7027 if (status == nfserr_admin_revoked)
7028 nfsd40_drop_revoked_stid(cl, stateid);
7029 return status;
7030 }
7031
7032 __be32
nfsd4_lookup_stateid(struct nfsd4_compound_state * cstate,stateid_t * stateid,unsigned short typemask,unsigned short statusmask,struct nfs4_stid ** s,struct nfsd_net * nn)7033 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
7034 stateid_t *stateid,
7035 unsigned short typemask, unsigned short statusmask,
7036 struct nfs4_stid **s, struct nfsd_net *nn)
7037 {
7038 __be32 status;
7039 struct nfs4_stid *stid;
7040 bool return_revoked = false;
7041
7042 /*
7043 * only return revoked delegations if explicitly asked.
7044 * otherwise we report revoked or bad_stateid status.
7045 */
7046 if (statusmask & SC_STATUS_REVOKED)
7047 return_revoked = true;
7048 if (typemask & SC_TYPE_DELEG)
7049 /* Always allow REVOKED for DELEG so we can
7050 * retturn the appropriate error.
7051 */
7052 statusmask |= SC_STATUS_REVOKED;
7053
7054 statusmask |= SC_STATUS_ADMIN_REVOKED;
7055
7056 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
7057 CLOSE_STATEID(stateid))
7058 return nfserr_bad_stateid;
7059 status = set_client(&stateid->si_opaque.so_clid, cstate, nn);
7060 if (status == nfserr_stale_clientid) {
7061 if (cstate->session)
7062 return nfserr_bad_stateid;
7063 return nfserr_stale_stateid;
7064 }
7065 if (status)
7066 return status;
7067 stid = find_stateid_by_type(cstate->clp, stateid, typemask, statusmask);
7068 if (!stid)
7069 return nfserr_bad_stateid;
7070 if ((stid->sc_status & SC_STATUS_REVOKED) && !return_revoked) {
7071 nfs4_put_stid(stid);
7072 return nfserr_deleg_revoked;
7073 }
7074 if (stid->sc_status & SC_STATUS_ADMIN_REVOKED) {
7075 nfsd40_drop_revoked_stid(cstate->clp, stateid);
7076 nfs4_put_stid(stid);
7077 return nfserr_admin_revoked;
7078 }
7079 *s = stid;
7080 return nfs_ok;
7081 }
7082
7083 static struct nfsd_file *
nfs4_find_file(struct nfs4_stid * s,int flags)7084 nfs4_find_file(struct nfs4_stid *s, int flags)
7085 {
7086 struct nfsd_file *ret = NULL;
7087
7088 if (!s || s->sc_status)
7089 return NULL;
7090
7091 switch (s->sc_type) {
7092 case SC_TYPE_DELEG:
7093 spin_lock(&s->sc_file->fi_lock);
7094 ret = nfsd_file_get(s->sc_file->fi_deleg_file);
7095 spin_unlock(&s->sc_file->fi_lock);
7096 break;
7097 case SC_TYPE_OPEN:
7098 case SC_TYPE_LOCK:
7099 if (flags & RD_STATE)
7100 ret = find_readable_file(s->sc_file);
7101 else
7102 ret = find_writeable_file(s->sc_file);
7103 }
7104
7105 return ret;
7106 }
7107
7108 static __be32
nfs4_check_olstateid(struct nfs4_ol_stateid * ols,int flags)7109 nfs4_check_olstateid(struct nfs4_ol_stateid *ols, int flags)
7110 {
7111 __be32 status;
7112
7113 status = nfsd4_check_openowner_confirmed(ols);
7114 if (status)
7115 return status;
7116 return nfs4_check_openmode(ols, flags);
7117 }
7118
7119 static __be32
nfs4_check_file(struct svc_rqst * rqstp,struct svc_fh * fhp,struct nfs4_stid * s,struct nfsd_file ** nfp,int flags)7120 nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
7121 struct nfsd_file **nfp, int flags)
7122 {
7123 int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
7124 struct nfsd_file *nf;
7125 __be32 status;
7126
7127 nf = nfs4_find_file(s, flags);
7128 if (nf) {
7129 status = nfsd_permission(&rqstp->rq_cred,
7130 fhp->fh_export, fhp->fh_dentry,
7131 acc | NFSD_MAY_OWNER_OVERRIDE);
7132 if (status) {
7133 nfsd_file_put(nf);
7134 goto out;
7135 }
7136 } else {
7137 status = nfsd_file_acquire(rqstp, fhp, acc, &nf);
7138 if (status)
7139 return status;
7140 }
7141 *nfp = nf;
7142 out:
7143 return status;
7144 }
7145 static void
_free_cpntf_state_locked(struct nfsd_net * nn,struct nfs4_cpntf_state * cps)7146 _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
7147 {
7148 WARN_ON_ONCE(cps->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID);
7149 if (!refcount_dec_and_test(&cps->cp_stateid.cs_count))
7150 return;
7151 list_del(&cps->cp_list);
7152 idr_remove(&nn->s2s_cp_stateids,
7153 cps->cp_stateid.cs_stid.si_opaque.so_id);
7154 kfree(cps);
7155 }
7156 /*
7157 * A READ from an inter server to server COPY will have a
7158 * copy stateid. Look up the copy notify stateid from the
7159 * idr structure and take a reference on it.
7160 */
manage_cpntf_state(struct nfsd_net * nn,stateid_t * st,struct nfs4_client * clp,struct nfs4_cpntf_state ** cps)7161 __be32 manage_cpntf_state(struct nfsd_net *nn, stateid_t *st,
7162 struct nfs4_client *clp,
7163 struct nfs4_cpntf_state **cps)
7164 {
7165 copy_stateid_t *cps_t;
7166 struct nfs4_cpntf_state *state = NULL;
7167
7168 if (st->si_opaque.so_clid.cl_id != nn->s2s_cp_cl_id)
7169 return nfserr_bad_stateid;
7170 spin_lock(&nn->s2s_cp_lock);
7171 cps_t = idr_find(&nn->s2s_cp_stateids, st->si_opaque.so_id);
7172 if (cps_t) {
7173 state = container_of(cps_t, struct nfs4_cpntf_state,
7174 cp_stateid);
7175 if (state->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID) {
7176 state = NULL;
7177 goto unlock;
7178 }
7179 if (!clp)
7180 refcount_inc(&state->cp_stateid.cs_count);
7181 else
7182 _free_cpntf_state_locked(nn, state);
7183 }
7184 unlock:
7185 spin_unlock(&nn->s2s_cp_lock);
7186 if (!state)
7187 return nfserr_bad_stateid;
7188 if (!clp)
7189 *cps = state;
7190 return 0;
7191 }
7192
find_cpntf_state(struct nfsd_net * nn,stateid_t * st,struct nfs4_stid ** stid)7193 static __be32 find_cpntf_state(struct nfsd_net *nn, stateid_t *st,
7194 struct nfs4_stid **stid)
7195 {
7196 __be32 status;
7197 struct nfs4_cpntf_state *cps = NULL;
7198 struct nfs4_client *found;
7199
7200 status = manage_cpntf_state(nn, st, NULL, &cps);
7201 if (status)
7202 return status;
7203
7204 cps->cpntf_time = ktime_get_boottime_seconds();
7205
7206 status = nfserr_expired;
7207 found = lookup_clientid(&cps->cp_p_clid, true, nn);
7208 if (!found)
7209 goto out;
7210
7211 *stid = find_stateid_by_type(found, &cps->cp_p_stateid,
7212 SC_TYPE_DELEG|SC_TYPE_OPEN|SC_TYPE_LOCK,
7213 0);
7214 if (*stid)
7215 status = nfs_ok;
7216 else
7217 status = nfserr_bad_stateid;
7218
7219 put_client_renew(found);
7220 out:
7221 nfs4_put_cpntf_state(nn, cps);
7222 return status;
7223 }
7224
nfs4_put_cpntf_state(struct nfsd_net * nn,struct nfs4_cpntf_state * cps)7225 void nfs4_put_cpntf_state(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
7226 {
7227 spin_lock(&nn->s2s_cp_lock);
7228 _free_cpntf_state_locked(nn, cps);
7229 spin_unlock(&nn->s2s_cp_lock);
7230 }
7231
7232 /**
7233 * nfs4_preprocess_stateid_op - find and prep stateid for an operation
7234 * @rqstp: incoming request from client
7235 * @cstate: current compound state
7236 * @fhp: filehandle associated with requested stateid
7237 * @stateid: stateid (provided by client)
7238 * @flags: flags describing type of operation to be done
7239 * @nfp: optional nfsd_file return pointer (may be NULL)
7240 * @cstid: optional returned nfs4_stid pointer (may be NULL)
7241 *
7242 * Given info from the client, look up a nfs4_stid for the operation. On
7243 * success, it returns a reference to the nfs4_stid and/or the nfsd_file
7244 * associated with it.
7245 */
7246 __be32
nfs4_preprocess_stateid_op(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct svc_fh * fhp,stateid_t * stateid,int flags,struct nfsd_file ** nfp,struct nfs4_stid ** cstid)7247 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
7248 struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
7249 stateid_t *stateid, int flags, struct nfsd_file **nfp,
7250 struct nfs4_stid **cstid)
7251 {
7252 struct net *net = SVC_NET(rqstp);
7253 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7254 struct nfs4_stid *s = NULL;
7255 __be32 status;
7256
7257 if (nfp)
7258 *nfp = NULL;
7259
7260 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
7261 status = check_special_stateids(net, fhp, stateid, flags);
7262 goto done;
7263 }
7264
7265 status = nfsd4_lookup_stateid(cstate, stateid,
7266 SC_TYPE_DELEG|SC_TYPE_OPEN|SC_TYPE_LOCK,
7267 0, &s, nn);
7268 if (status == nfserr_bad_stateid)
7269 status = find_cpntf_state(nn, stateid, &s);
7270 if (status)
7271 return status;
7272 status = nfsd4_stid_check_stateid_generation(stateid, s,
7273 nfsd4_has_session(cstate));
7274 if (status)
7275 goto out;
7276
7277 switch (s->sc_type) {
7278 case SC_TYPE_DELEG:
7279 status = nfs4_check_delegmode(delegstateid(s), flags);
7280 break;
7281 case SC_TYPE_OPEN:
7282 case SC_TYPE_LOCK:
7283 status = nfs4_check_olstateid(openlockstateid(s), flags);
7284 break;
7285 }
7286 if (status)
7287 goto out;
7288 status = nfs4_check_fh(fhp, s);
7289
7290 done:
7291 if (status == nfs_ok && nfp)
7292 status = nfs4_check_file(rqstp, fhp, s, nfp, flags);
7293 out:
7294 if (s) {
7295 if (!status && cstid)
7296 *cstid = s;
7297 else
7298 nfs4_put_stid(s);
7299 }
7300 return status;
7301 }
7302
7303 /*
7304 * Test if the stateid is valid
7305 */
7306 __be32
nfsd4_test_stateid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7307 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7308 union nfsd4_op_u *u)
7309 {
7310 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
7311 struct nfsd4_test_stateid_id *stateid;
7312 struct nfs4_client *cl = cstate->clp;
7313
7314 list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
7315 stateid->ts_id_status =
7316 nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
7317
7318 return nfs_ok;
7319 }
7320
7321 static __be32
nfsd4_free_lock_stateid(stateid_t * stateid,struct nfs4_stid * s)7322 nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
7323 {
7324 struct nfs4_ol_stateid *stp = openlockstateid(s);
7325 __be32 ret;
7326
7327 ret = nfsd4_lock_ol_stateid(stp);
7328 if (ret)
7329 goto out_put_stid;
7330
7331 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
7332 if (ret)
7333 goto out;
7334
7335 ret = nfserr_locks_held;
7336 if (check_for_locks(stp->st_stid.sc_file,
7337 lockowner(stp->st_stateowner)))
7338 goto out;
7339
7340 release_lock_stateid(stp);
7341 ret = nfs_ok;
7342
7343 out:
7344 mutex_unlock(&stp->st_mutex);
7345 out_put_stid:
7346 nfs4_put_stid(s);
7347 return ret;
7348 }
7349
7350 __be32
nfsd4_free_stateid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7351 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7352 union nfsd4_op_u *u)
7353 {
7354 struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
7355 stateid_t *stateid = &free_stateid->fr_stateid;
7356 struct nfs4_stid *s;
7357 struct nfs4_delegation *dp;
7358 struct nfs4_client *cl = cstate->clp;
7359 __be32 ret = nfserr_bad_stateid;
7360
7361 spin_lock(&cl->cl_lock);
7362 s = find_stateid_locked(cl, stateid);
7363 if (!s || s->sc_status & SC_STATUS_CLOSED)
7364 goto out_unlock;
7365 if (s->sc_status & SC_STATUS_ADMIN_REVOKED) {
7366 nfsd4_drop_revoked_stid(s);
7367 ret = nfs_ok;
7368 goto out;
7369 }
7370 spin_lock(&s->sc_lock);
7371 switch (s->sc_type) {
7372 case SC_TYPE_DELEG:
7373 if (s->sc_status & SC_STATUS_REVOKED) {
7374 s->sc_status |= SC_STATUS_CLOSED;
7375 spin_unlock(&s->sc_lock);
7376 dp = delegstateid(s);
7377 if (s->sc_status & SC_STATUS_FREEABLE)
7378 list_del_init(&dp->dl_recall_lru);
7379 s->sc_status |= SC_STATUS_FREED;
7380 spin_unlock(&cl->cl_lock);
7381 nfs4_put_stid(s);
7382 ret = nfs_ok;
7383 goto out;
7384 }
7385 ret = nfserr_locks_held;
7386 break;
7387 case SC_TYPE_OPEN:
7388 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
7389 if (ret)
7390 break;
7391 ret = nfserr_locks_held;
7392 break;
7393 case SC_TYPE_LOCK:
7394 spin_unlock(&s->sc_lock);
7395 refcount_inc(&s->sc_count);
7396 spin_unlock(&cl->cl_lock);
7397 ret = nfsd4_free_lock_stateid(stateid, s);
7398 goto out;
7399 }
7400 spin_unlock(&s->sc_lock);
7401 out_unlock:
7402 spin_unlock(&cl->cl_lock);
7403 out:
7404 return ret;
7405 }
7406
7407 static inline int
setlkflg(int type)7408 setlkflg (int type)
7409 {
7410 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
7411 RD_STATE : WR_STATE;
7412 }
7413
nfs4_seqid_op_checks(struct nfsd4_compound_state * cstate,stateid_t * stateid,u32 seqid,struct nfs4_ol_stateid * stp)7414 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
7415 {
7416 struct svc_fh *current_fh = &cstate->current_fh;
7417 struct nfs4_stateowner *sop = stp->st_stateowner;
7418 __be32 status;
7419
7420 status = nfsd4_check_seqid(cstate, sop, seqid);
7421 if (status)
7422 return status;
7423 status = nfsd4_lock_ol_stateid(stp);
7424 if (status != nfs_ok)
7425 return status;
7426 status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
7427 if (status == nfs_ok)
7428 status = nfs4_check_fh(current_fh, &stp->st_stid);
7429 if (status != nfs_ok)
7430 mutex_unlock(&stp->st_mutex);
7431 return status;
7432 }
7433
7434 /**
7435 * nfs4_preprocess_seqid_op - find and prep an ol_stateid for a seqid-morphing op
7436 * @cstate: compund state
7437 * @seqid: seqid (provided by client)
7438 * @stateid: stateid (provided by client)
7439 * @typemask: mask of allowable types for this operation
7440 * @statusmask: mask of allowed states: 0 or STID_CLOSED
7441 * @stpp: return pointer for the stateid found
7442 * @nn: net namespace for request
7443 *
7444 * Given a stateid+seqid from a client, look up an nfs4_ol_stateid and
7445 * return it in @stpp. On a nfs_ok return, the returned stateid will
7446 * have its st_mutex locked.
7447 */
7448 static __be32
nfs4_preprocess_seqid_op(struct nfsd4_compound_state * cstate,u32 seqid,stateid_t * stateid,unsigned short typemask,unsigned short statusmask,struct nfs4_ol_stateid ** stpp,struct nfsd_net * nn)7449 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
7450 stateid_t *stateid,
7451 unsigned short typemask, unsigned short statusmask,
7452 struct nfs4_ol_stateid **stpp,
7453 struct nfsd_net *nn)
7454 {
7455 __be32 status;
7456 struct nfs4_stid *s;
7457 struct nfs4_ol_stateid *stp = NULL;
7458
7459 trace_nfsd_preprocess(seqid, stateid);
7460
7461 *stpp = NULL;
7462 retry:
7463 status = nfsd4_lookup_stateid(cstate, stateid,
7464 typemask, statusmask, &s, nn);
7465 if (status)
7466 return status;
7467 stp = openlockstateid(s);
7468 if (nfsd4_cstate_assign_replay(cstate, stp->st_stateowner) == -EAGAIN) {
7469 nfs4_put_stateowner(stp->st_stateowner);
7470 goto retry;
7471 }
7472
7473 status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
7474 if (!status)
7475 *stpp = stp;
7476 else
7477 nfs4_put_stid(&stp->st_stid);
7478 return status;
7479 }
7480
nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state * cstate,u32 seqid,stateid_t * stateid,struct nfs4_ol_stateid ** stpp,struct nfsd_net * nn)7481 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
7482 stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
7483 {
7484 __be32 status;
7485 struct nfs4_openowner *oo;
7486 struct nfs4_ol_stateid *stp;
7487
7488 status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
7489 SC_TYPE_OPEN, 0, &stp, nn);
7490 if (status)
7491 return status;
7492 oo = openowner(stp->st_stateowner);
7493 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
7494 mutex_unlock(&stp->st_mutex);
7495 nfs4_put_stid(&stp->st_stid);
7496 return nfserr_bad_stateid;
7497 }
7498 *stpp = stp;
7499 return nfs_ok;
7500 }
7501
7502 __be32
nfsd4_open_confirm(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7503 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7504 union nfsd4_op_u *u)
7505 {
7506 struct nfsd4_open_confirm *oc = &u->open_confirm;
7507 __be32 status;
7508 struct nfs4_openowner *oo;
7509 struct nfs4_ol_stateid *stp;
7510 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7511
7512 dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
7513 cstate->current_fh.fh_dentry);
7514
7515 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
7516 if (status)
7517 return status;
7518
7519 status = nfs4_preprocess_seqid_op(cstate,
7520 oc->oc_seqid, &oc->oc_req_stateid,
7521 SC_TYPE_OPEN, 0, &stp, nn);
7522 if (status)
7523 goto out;
7524 oo = openowner(stp->st_stateowner);
7525 status = nfserr_bad_stateid;
7526 if (oo->oo_flags & NFS4_OO_CONFIRMED) {
7527 mutex_unlock(&stp->st_mutex);
7528 goto put_stateid;
7529 }
7530 oo->oo_flags |= NFS4_OO_CONFIRMED;
7531 nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
7532 mutex_unlock(&stp->st_mutex);
7533 trace_nfsd_open_confirm(oc->oc_seqid, &stp->st_stid.sc_stateid);
7534 nfsd4_client_record_create(oo->oo_owner.so_client);
7535 status = nfs_ok;
7536 put_stateid:
7537 nfs4_put_stid(&stp->st_stid);
7538 out:
7539 nfsd4_bump_seqid(cstate, status);
7540 return status;
7541 }
7542
nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid * stp,u32 access)7543 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
7544 {
7545 if (!test_access(access, stp))
7546 return;
7547 nfs4_file_put_access(stp->st_stid.sc_file, access);
7548 clear_access(access, stp);
7549 }
7550
nfs4_stateid_downgrade(struct nfs4_ol_stateid * stp,u32 to_access)7551 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
7552 {
7553 switch (to_access) {
7554 case NFS4_SHARE_ACCESS_READ:
7555 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
7556 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
7557 break;
7558 case NFS4_SHARE_ACCESS_WRITE:
7559 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
7560 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
7561 break;
7562 case NFS4_SHARE_ACCESS_BOTH:
7563 break;
7564 default:
7565 WARN_ON_ONCE(1);
7566 }
7567 }
7568
7569 __be32
nfsd4_open_downgrade(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7570 nfsd4_open_downgrade(struct svc_rqst *rqstp,
7571 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
7572 {
7573 struct nfsd4_open_downgrade *od = &u->open_downgrade;
7574 __be32 status;
7575 struct nfs4_ol_stateid *stp;
7576 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7577
7578 dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
7579 cstate->current_fh.fh_dentry);
7580
7581 /* We don't yet support WANT bits: */
7582 if (od->od_deleg_want)
7583 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
7584 od->od_deleg_want);
7585
7586 status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
7587 &od->od_stateid, &stp, nn);
7588 if (status)
7589 goto out;
7590 status = nfserr_inval;
7591 if (!test_access(od->od_share_access, stp)) {
7592 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
7593 stp->st_access_bmap, od->od_share_access);
7594 goto put_stateid;
7595 }
7596 if (!test_deny(od->od_share_deny, stp)) {
7597 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
7598 stp->st_deny_bmap, od->od_share_deny);
7599 goto put_stateid;
7600 }
7601 nfs4_stateid_downgrade(stp, od->od_share_access);
7602 reset_union_bmap_deny(od->od_share_deny, stp);
7603 nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
7604 status = nfs_ok;
7605 put_stateid:
7606 mutex_unlock(&stp->st_mutex);
7607 nfs4_put_stid(&stp->st_stid);
7608 out:
7609 nfsd4_bump_seqid(cstate, status);
7610 return status;
7611 }
7612
nfsd4_close_open_stateid(struct nfs4_ol_stateid * s)7613 static bool nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
7614 {
7615 struct nfs4_client *clp = s->st_stid.sc_client;
7616 bool unhashed;
7617 LIST_HEAD(reaplist);
7618 struct nfs4_ol_stateid *stp;
7619
7620 spin_lock(&clp->cl_lock);
7621 unhashed = unhash_open_stateid(s, &reaplist);
7622
7623 if (clp->cl_minorversion) {
7624 if (unhashed)
7625 put_ol_stateid_locked(s, &reaplist);
7626 spin_unlock(&clp->cl_lock);
7627 list_for_each_entry(stp, &reaplist, st_locks)
7628 nfs4_free_cpntf_statelist(clp->net, &stp->st_stid);
7629 free_ol_stateid_reaplist(&reaplist);
7630 return false;
7631 } else {
7632 spin_unlock(&clp->cl_lock);
7633 free_ol_stateid_reaplist(&reaplist);
7634 return unhashed;
7635 }
7636 }
7637
7638 /*
7639 * nfs4_unlock_state() called after encode
7640 */
7641 __be32
nfsd4_close(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7642 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7643 union nfsd4_op_u *u)
7644 {
7645 struct nfsd4_close *close = &u->close;
7646 __be32 status;
7647 struct nfs4_ol_stateid *stp;
7648 struct net *net = SVC_NET(rqstp);
7649 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7650 bool need_move_to_close_list;
7651
7652 dprintk("NFSD: nfsd4_close on file %pd\n",
7653 cstate->current_fh.fh_dentry);
7654
7655 status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
7656 &close->cl_stateid,
7657 SC_TYPE_OPEN, SC_STATUS_CLOSED,
7658 &stp, nn);
7659 nfsd4_bump_seqid(cstate, status);
7660 if (status)
7661 goto out;
7662
7663 spin_lock(&stp->st_stid.sc_client->cl_lock);
7664 stp->st_stid.sc_status |= SC_STATUS_CLOSED;
7665 spin_unlock(&stp->st_stid.sc_client->cl_lock);
7666
7667 /*
7668 * Technically we don't _really_ have to increment or copy it, since
7669 * it should just be gone after this operation and we clobber the
7670 * copied value below, but we continue to do so here just to ensure
7671 * that racing ops see that there was a state change.
7672 */
7673 nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
7674
7675 need_move_to_close_list = nfsd4_close_open_stateid(stp);
7676 mutex_unlock(&stp->st_mutex);
7677 if (need_move_to_close_list)
7678 move_to_close_lru(stp, net);
7679
7680 /* v4.1+ suggests that we send a special stateid in here, since the
7681 * clients should just ignore this anyway. Since this is not useful
7682 * for v4.0 clients either, we set it to the special close_stateid
7683 * universally.
7684 *
7685 * See RFC5661 section 18.2.4, and RFC7530 section 16.2.5
7686 */
7687 memcpy(&close->cl_stateid, &close_stateid, sizeof(close->cl_stateid));
7688
7689 /* put reference from nfs4_preprocess_seqid_op */
7690 nfs4_put_stid(&stp->st_stid);
7691 out:
7692 return status;
7693 }
7694
7695 __be32
nfsd4_delegreturn(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7696 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7697 union nfsd4_op_u *u)
7698 {
7699 struct nfsd4_delegreturn *dr = &u->delegreturn;
7700 struct nfs4_delegation *dp;
7701 stateid_t *stateid = &dr->dr_stateid;
7702 struct nfs4_stid *s;
7703 __be32 status;
7704 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7705
7706 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
7707 return status;
7708
7709 status = nfsd4_lookup_stateid(cstate, stateid, SC_TYPE_DELEG,
7710 SC_STATUS_REVOKED | SC_STATUS_FREEABLE,
7711 &s, nn);
7712 if (status)
7713 goto out;
7714 dp = delegstateid(s);
7715 status = nfsd4_stid_check_stateid_generation(stateid, &dp->dl_stid, nfsd4_has_session(cstate));
7716 if (status)
7717 goto put_stateid;
7718
7719 trace_nfsd_deleg_return(stateid);
7720 destroy_delegation(dp);
7721 smp_mb__after_atomic();
7722 wake_up_var(d_inode(cstate->current_fh.fh_dentry));
7723 put_stateid:
7724 nfs4_put_stid(&dp->dl_stid);
7725 out:
7726 return status;
7727 }
7728
7729 /* last octet in a range */
7730 static inline u64
last_byte_offset(u64 start,u64 len)7731 last_byte_offset(u64 start, u64 len)
7732 {
7733 u64 end;
7734
7735 WARN_ON_ONCE(!len);
7736 end = start + len;
7737 return end > start ? end - 1: NFS4_MAX_UINT64;
7738 }
7739
7740 /*
7741 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
7742 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
7743 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
7744 * locking, this prevents us from being completely protocol-compliant. The
7745 * real solution to this problem is to start using unsigned file offsets in
7746 * the VFS, but this is a very deep change!
7747 */
7748 static inline void
nfs4_transform_lock_offset(struct file_lock * lock)7749 nfs4_transform_lock_offset(struct file_lock *lock)
7750 {
7751 if (lock->fl_start < 0)
7752 lock->fl_start = OFFSET_MAX;
7753 if (lock->fl_end < 0)
7754 lock->fl_end = OFFSET_MAX;
7755 }
7756
7757 static fl_owner_t
nfsd4_lm_get_owner(fl_owner_t owner)7758 nfsd4_lm_get_owner(fl_owner_t owner)
7759 {
7760 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
7761
7762 nfs4_get_stateowner(&lo->lo_owner);
7763 return owner;
7764 }
7765
7766 static void
nfsd4_lm_put_owner(fl_owner_t owner)7767 nfsd4_lm_put_owner(fl_owner_t owner)
7768 {
7769 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
7770
7771 if (lo)
7772 nfs4_put_stateowner(&lo->lo_owner);
7773 }
7774
7775 /* return pointer to struct nfs4_client if client is expirable */
7776 static bool
nfsd4_lm_lock_expirable(struct file_lock * cfl)7777 nfsd4_lm_lock_expirable(struct file_lock *cfl)
7778 {
7779 struct nfs4_lockowner *lo = (struct nfs4_lockowner *) cfl->c.flc_owner;
7780 struct nfs4_client *clp = lo->lo_owner.so_client;
7781 struct nfsd_net *nn;
7782
7783 if (try_to_expire_client(clp)) {
7784 nn = net_generic(clp->net, nfsd_net_id);
7785 mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
7786 return true;
7787 }
7788 return false;
7789 }
7790
7791 /* schedule laundromat to run immediately and wait for it to complete */
7792 static void
nfsd4_lm_expire_lock(void)7793 nfsd4_lm_expire_lock(void)
7794 {
7795 flush_workqueue(laundry_wq);
7796 }
7797
7798 static void
nfsd4_lm_notify(struct file_lock * fl)7799 nfsd4_lm_notify(struct file_lock *fl)
7800 {
7801 struct nfs4_lockowner *lo = (struct nfs4_lockowner *) fl->c.flc_owner;
7802 struct net *net = lo->lo_owner.so_client->net;
7803 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7804 struct nfsd4_blocked_lock *nbl = container_of(fl,
7805 struct nfsd4_blocked_lock, nbl_lock);
7806 bool queue = false;
7807
7808 /* An empty list means that something else is going to be using it */
7809 spin_lock(&nn->blocked_locks_lock);
7810 if (!list_empty(&nbl->nbl_list)) {
7811 list_del_init(&nbl->nbl_list);
7812 list_del_init(&nbl->nbl_lru);
7813 queue = true;
7814 }
7815 spin_unlock(&nn->blocked_locks_lock);
7816
7817 if (queue) {
7818 trace_nfsd_cb_notify_lock(lo, nbl);
7819 nfsd4_run_cb(&nbl->nbl_cb);
7820 }
7821 }
7822
7823 static const struct lock_manager_operations nfsd_posix_mng_ops = {
7824 .lm_mod_owner = THIS_MODULE,
7825 .lm_notify = nfsd4_lm_notify,
7826 .lm_get_owner = nfsd4_lm_get_owner,
7827 .lm_put_owner = nfsd4_lm_put_owner,
7828 .lm_lock_expirable = nfsd4_lm_lock_expirable,
7829 .lm_expire_lock = nfsd4_lm_expire_lock,
7830 };
7831
7832 static inline void
nfs4_set_lock_denied(struct file_lock * fl,struct nfsd4_lock_denied * deny)7833 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
7834 {
7835 struct nfs4_lockowner *lo;
7836
7837 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
7838 lo = (struct nfs4_lockowner *) fl->c.flc_owner;
7839 xdr_netobj_dup(&deny->ld_owner, &lo->lo_owner.so_owner,
7840 GFP_KERNEL);
7841 if (!deny->ld_owner.data)
7842 /* We just don't care that much */
7843 goto nevermind;
7844 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
7845 } else {
7846 nevermind:
7847 deny->ld_owner.len = 0;
7848 deny->ld_owner.data = NULL;
7849 deny->ld_clientid.cl_boot = 0;
7850 deny->ld_clientid.cl_id = 0;
7851 }
7852 deny->ld_start = fl->fl_start;
7853 deny->ld_length = NFS4_MAX_UINT64;
7854 if (fl->fl_end != NFS4_MAX_UINT64)
7855 deny->ld_length = fl->fl_end - fl->fl_start + 1;
7856 deny->ld_type = NFS4_READ_LT;
7857 if (fl->c.flc_type != F_RDLCK)
7858 deny->ld_type = NFS4_WRITE_LT;
7859 }
7860
7861 static struct nfs4_lockowner *
find_lockowner_str_locked(struct nfs4_client * clp,struct xdr_netobj * owner)7862 find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
7863 {
7864 unsigned int strhashval = ownerstr_hashval(owner);
7865 struct nfs4_stateowner *so;
7866
7867 lockdep_assert_held(&clp->cl_lock);
7868
7869 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
7870 so_strhash) {
7871 if (so->so_is_open_owner)
7872 continue;
7873 if (same_owner_str(so, owner))
7874 return lockowner(nfs4_get_stateowner(so));
7875 }
7876 return NULL;
7877 }
7878
7879 static struct nfs4_lockowner *
find_lockowner_str(struct nfs4_client * clp,struct xdr_netobj * owner)7880 find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
7881 {
7882 struct nfs4_lockowner *lo;
7883
7884 spin_lock(&clp->cl_lock);
7885 lo = find_lockowner_str_locked(clp, owner);
7886 spin_unlock(&clp->cl_lock);
7887 return lo;
7888 }
7889
nfs4_unhash_lockowner(struct nfs4_stateowner * sop)7890 static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
7891 {
7892 unhash_lockowner_locked(lockowner(sop));
7893 }
7894
nfs4_free_lockowner(struct nfs4_stateowner * sop)7895 static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
7896 {
7897 struct nfs4_lockowner *lo = lockowner(sop);
7898
7899 kmem_cache_free(lockowner_slab, lo);
7900 }
7901
7902 static const struct nfs4_stateowner_operations lockowner_ops = {
7903 .so_unhash = nfs4_unhash_lockowner,
7904 .so_free = nfs4_free_lockowner,
7905 };
7906
7907 /*
7908 * Alloc a lock owner structure.
7909 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
7910 * occurred.
7911 *
7912 * strhashval = ownerstr_hashval
7913 */
7914 static struct nfs4_lockowner *
alloc_init_lock_stateowner(unsigned int strhashval,struct nfs4_client * clp,struct nfs4_ol_stateid * open_stp,struct nfsd4_lock * lock)7915 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
7916 struct nfs4_ol_stateid *open_stp,
7917 struct nfsd4_lock *lock)
7918 {
7919 struct nfs4_lockowner *lo, *ret;
7920
7921 lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
7922 if (!lo)
7923 return NULL;
7924 INIT_LIST_HEAD(&lo->lo_blocked);
7925 INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
7926 lo->lo_owner.so_is_open_owner = 0;
7927 lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
7928 lo->lo_owner.so_ops = &lockowner_ops;
7929 spin_lock(&clp->cl_lock);
7930 ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
7931 if (ret == NULL) {
7932 list_add(&lo->lo_owner.so_strhash,
7933 &clp->cl_ownerstr_hashtbl[strhashval]);
7934 ret = lo;
7935 } else
7936 nfs4_free_stateowner(&lo->lo_owner);
7937
7938 spin_unlock(&clp->cl_lock);
7939 return ret;
7940 }
7941
7942 static struct nfs4_ol_stateid *
find_lock_stateid(const struct nfs4_lockowner * lo,const struct nfs4_ol_stateid * ost)7943 find_lock_stateid(const struct nfs4_lockowner *lo,
7944 const struct nfs4_ol_stateid *ost)
7945 {
7946 struct nfs4_ol_stateid *lst;
7947
7948 lockdep_assert_held(&ost->st_stid.sc_client->cl_lock);
7949
7950 /* If ost is not hashed, ost->st_locks will not be valid */
7951 if (!nfs4_ol_stateid_unhashed(ost))
7952 list_for_each_entry(lst, &ost->st_locks, st_locks) {
7953 if (lst->st_stateowner == &lo->lo_owner) {
7954 refcount_inc(&lst->st_stid.sc_count);
7955 return lst;
7956 }
7957 }
7958 return NULL;
7959 }
7960
7961 static struct nfs4_ol_stateid *
init_lock_stateid(struct nfs4_ol_stateid * stp,struct nfs4_lockowner * lo,struct nfs4_file * fp,struct inode * inode,struct nfs4_ol_stateid * open_stp)7962 init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
7963 struct nfs4_file *fp, struct inode *inode,
7964 struct nfs4_ol_stateid *open_stp)
7965 {
7966 struct nfs4_client *clp = lo->lo_owner.so_client;
7967 struct nfs4_ol_stateid *retstp;
7968
7969 mutex_init(&stp->st_mutex);
7970 mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
7971 retry:
7972 spin_lock(&clp->cl_lock);
7973 if (nfs4_ol_stateid_unhashed(open_stp))
7974 goto out_close;
7975 retstp = find_lock_stateid(lo, open_stp);
7976 if (retstp)
7977 goto out_found;
7978 refcount_inc(&stp->st_stid.sc_count);
7979 stp->st_stid.sc_type = SC_TYPE_LOCK;
7980 stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
7981 get_nfs4_file(fp);
7982 stp->st_stid.sc_file = fp;
7983 stp->st_access_bmap = 0;
7984 stp->st_deny_bmap = open_stp->st_deny_bmap;
7985 stp->st_openstp = open_stp;
7986 spin_lock(&fp->fi_lock);
7987 list_add(&stp->st_locks, &open_stp->st_locks);
7988 list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
7989 list_add(&stp->st_perfile, &fp->fi_stateids);
7990 spin_unlock(&fp->fi_lock);
7991 spin_unlock(&clp->cl_lock);
7992 return stp;
7993 out_found:
7994 spin_unlock(&clp->cl_lock);
7995 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
7996 nfs4_put_stid(&retstp->st_stid);
7997 goto retry;
7998 }
7999 /* To keep mutex tracking happy */
8000 mutex_unlock(&stp->st_mutex);
8001 return retstp;
8002 out_close:
8003 spin_unlock(&clp->cl_lock);
8004 mutex_unlock(&stp->st_mutex);
8005 return NULL;
8006 }
8007
8008 static struct nfs4_ol_stateid *
find_or_create_lock_stateid(struct nfs4_lockowner * lo,struct nfs4_file * fi,struct inode * inode,struct nfs4_ol_stateid * ost,bool * new)8009 find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
8010 struct inode *inode, struct nfs4_ol_stateid *ost,
8011 bool *new)
8012 {
8013 struct nfs4_stid *ns = NULL;
8014 struct nfs4_ol_stateid *lst;
8015 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
8016 struct nfs4_client *clp = oo->oo_owner.so_client;
8017
8018 *new = false;
8019 spin_lock(&clp->cl_lock);
8020 lst = find_lock_stateid(lo, ost);
8021 spin_unlock(&clp->cl_lock);
8022 if (lst != NULL) {
8023 if (nfsd4_lock_ol_stateid(lst) == nfs_ok)
8024 goto out;
8025 nfs4_put_stid(&lst->st_stid);
8026 }
8027 ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid);
8028 if (ns == NULL)
8029 return NULL;
8030
8031 lst = init_lock_stateid(openlockstateid(ns), lo, fi, inode, ost);
8032 if (lst == openlockstateid(ns))
8033 *new = true;
8034 else
8035 nfs4_put_stid(ns);
8036 out:
8037 return lst;
8038 }
8039
8040 static int
check_lock_length(u64 offset,u64 length)8041 check_lock_length(u64 offset, u64 length)
8042 {
8043 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
8044 (length > ~offset)));
8045 }
8046
get_lock_access(struct nfs4_ol_stateid * lock_stp,u32 access)8047 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
8048 {
8049 struct nfs4_file *fp = lock_stp->st_stid.sc_file;
8050
8051 lockdep_assert_held(&fp->fi_lock);
8052
8053 if (test_access(access, lock_stp))
8054 return;
8055 __nfs4_file_get_access(fp, access);
8056 set_access(access, lock_stp);
8057 }
8058
8059 static __be32
lookup_or_create_lock_state(struct nfsd4_compound_state * cstate,struct nfs4_ol_stateid * ost,struct nfsd4_lock * lock,struct nfs4_ol_stateid ** plst,bool * new)8060 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
8061 struct nfs4_ol_stateid *ost,
8062 struct nfsd4_lock *lock,
8063 struct nfs4_ol_stateid **plst, bool *new)
8064 {
8065 __be32 status;
8066 struct nfs4_file *fi = ost->st_stid.sc_file;
8067 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
8068 struct nfs4_client *cl = oo->oo_owner.so_client;
8069 struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
8070 struct nfs4_lockowner *lo;
8071 struct nfs4_ol_stateid *lst;
8072 unsigned int strhashval;
8073
8074 lo = find_lockowner_str(cl, &lock->lk_new_owner);
8075 if (!lo) {
8076 strhashval = ownerstr_hashval(&lock->lk_new_owner);
8077 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
8078 if (lo == NULL)
8079 return nfserr_jukebox;
8080 } else {
8081 /* with an existing lockowner, seqids must be the same */
8082 status = nfserr_bad_seqid;
8083 if (!cstate->minorversion &&
8084 lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
8085 goto out;
8086 }
8087
8088 lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
8089 if (lst == NULL) {
8090 status = nfserr_jukebox;
8091 goto out;
8092 }
8093
8094 status = nfs_ok;
8095 *plst = lst;
8096 out:
8097 nfs4_put_stateowner(&lo->lo_owner);
8098 return status;
8099 }
8100
8101 /*
8102 * LOCK operation
8103 */
8104 __be32
nfsd4_lock(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8105 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
8106 union nfsd4_op_u *u)
8107 {
8108 struct nfsd4_lock *lock = &u->lock;
8109 struct nfs4_openowner *open_sop = NULL;
8110 struct nfs4_lockowner *lock_sop = NULL;
8111 struct nfs4_ol_stateid *lock_stp = NULL;
8112 struct nfs4_ol_stateid *open_stp = NULL;
8113 struct nfs4_file *fp;
8114 struct nfsd_file *nf = NULL;
8115 struct nfsd4_blocked_lock *nbl = NULL;
8116 struct file_lock *file_lock = NULL;
8117 struct file_lock *conflock = NULL;
8118 __be32 status = 0;
8119 int lkflg;
8120 int err;
8121 bool new = false;
8122 unsigned char type;
8123 unsigned int flags = FL_POSIX;
8124 struct net *net = SVC_NET(rqstp);
8125 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8126
8127 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
8128 (long long) lock->lk_offset,
8129 (long long) lock->lk_length);
8130
8131 if (check_lock_length(lock->lk_offset, lock->lk_length))
8132 return nfserr_inval;
8133
8134 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
8135 if (status != nfs_ok)
8136 return status;
8137
8138 if (lock->lk_is_new) {
8139 if (nfsd4_has_session(cstate))
8140 /* See rfc 5661 18.10.3: given clientid is ignored: */
8141 memcpy(&lock->lk_new_clientid,
8142 &cstate->clp->cl_clientid,
8143 sizeof(clientid_t));
8144
8145 /* validate and update open stateid and open seqid */
8146 status = nfs4_preprocess_confirmed_seqid_op(cstate,
8147 lock->lk_new_open_seqid,
8148 &lock->lk_new_open_stateid,
8149 &open_stp, nn);
8150 if (status)
8151 goto out;
8152 mutex_unlock(&open_stp->st_mutex);
8153 open_sop = openowner(open_stp->st_stateowner);
8154 status = nfserr_bad_stateid;
8155 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
8156 &lock->lk_new_clientid))
8157 goto out;
8158 status = lookup_or_create_lock_state(cstate, open_stp, lock,
8159 &lock_stp, &new);
8160 } else {
8161 status = nfs4_preprocess_seqid_op(cstate,
8162 lock->lk_old_lock_seqid,
8163 &lock->lk_old_lock_stateid,
8164 SC_TYPE_LOCK, 0, &lock_stp,
8165 nn);
8166 }
8167 if (status)
8168 goto out;
8169 lock_sop = lockowner(lock_stp->st_stateowner);
8170
8171 lkflg = setlkflg(lock->lk_type);
8172 status = nfs4_check_openmode(lock_stp, lkflg);
8173 if (status)
8174 goto out;
8175
8176 status = nfserr_grace;
8177 if (locks_in_grace(net) && !lock->lk_reclaim)
8178 goto out;
8179 status = nfserr_no_grace;
8180 if (!locks_in_grace(net) && lock->lk_reclaim)
8181 goto out;
8182
8183 if (lock->lk_reclaim)
8184 flags |= FL_RECLAIM;
8185
8186 fp = lock_stp->st_stid.sc_file;
8187 switch (lock->lk_type) {
8188 case NFS4_READW_LT:
8189 fallthrough;
8190 case NFS4_READ_LT:
8191 spin_lock(&fp->fi_lock);
8192 nf = find_readable_file_locked(fp);
8193 if (nf)
8194 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
8195 spin_unlock(&fp->fi_lock);
8196 type = F_RDLCK;
8197 break;
8198 case NFS4_WRITEW_LT:
8199 fallthrough;
8200 case NFS4_WRITE_LT:
8201 spin_lock(&fp->fi_lock);
8202 nf = find_writeable_file_locked(fp);
8203 if (nf)
8204 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
8205 spin_unlock(&fp->fi_lock);
8206 type = F_WRLCK;
8207 break;
8208 default:
8209 status = nfserr_inval;
8210 goto out;
8211 }
8212
8213 if (!nf) {
8214 status = nfserr_openmode;
8215 goto out;
8216 }
8217
8218 if (lock->lk_type & (NFS4_READW_LT | NFS4_WRITEW_LT) &&
8219 nfsd4_has_session(cstate) &&
8220 locks_can_async_lock(nf->nf_file->f_op))
8221 flags |= FL_SLEEP;
8222
8223 nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn);
8224 if (!nbl) {
8225 dprintk("NFSD: %s: unable to allocate block!\n", __func__);
8226 status = nfserr_jukebox;
8227 goto out;
8228 }
8229
8230 file_lock = &nbl->nbl_lock;
8231 file_lock->c.flc_type = type;
8232 file_lock->c.flc_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
8233 file_lock->c.flc_pid = current->tgid;
8234 file_lock->c.flc_file = nf->nf_file;
8235 file_lock->c.flc_flags = flags;
8236 file_lock->fl_lmops = &nfsd_posix_mng_ops;
8237 file_lock->fl_start = lock->lk_offset;
8238 file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
8239 nfs4_transform_lock_offset(file_lock);
8240
8241 conflock = locks_alloc_lock();
8242 if (!conflock) {
8243 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
8244 status = nfserr_jukebox;
8245 goto out;
8246 }
8247
8248 if (flags & FL_SLEEP) {
8249 nbl->nbl_time = ktime_get_boottime_seconds();
8250 spin_lock(&nn->blocked_locks_lock);
8251 list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked);
8252 list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru);
8253 kref_get(&nbl->nbl_kref);
8254 spin_unlock(&nn->blocked_locks_lock);
8255 }
8256
8257 err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, conflock);
8258 switch (err) {
8259 case 0: /* success! */
8260 nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
8261 status = 0;
8262 if (lock->lk_reclaim)
8263 nn->somebody_reclaimed = true;
8264 break;
8265 case FILE_LOCK_DEFERRED:
8266 kref_put(&nbl->nbl_kref, free_nbl);
8267 nbl = NULL;
8268 fallthrough;
8269 case -EAGAIN: /* conflock holds conflicting lock */
8270 status = nfserr_denied;
8271 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
8272 nfs4_set_lock_denied(conflock, &lock->lk_denied);
8273 break;
8274 case -EDEADLK:
8275 status = nfserr_deadlock;
8276 break;
8277 default:
8278 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
8279 status = nfserrno(err);
8280 break;
8281 }
8282 out:
8283 if (nbl) {
8284 /* dequeue it if we queued it before */
8285 if (flags & FL_SLEEP) {
8286 spin_lock(&nn->blocked_locks_lock);
8287 if (!list_empty(&nbl->nbl_list) &&
8288 !list_empty(&nbl->nbl_lru)) {
8289 list_del_init(&nbl->nbl_list);
8290 list_del_init(&nbl->nbl_lru);
8291 kref_put(&nbl->nbl_kref, free_nbl);
8292 }
8293 /* nbl can use one of lists to be linked to reaplist */
8294 spin_unlock(&nn->blocked_locks_lock);
8295 }
8296 free_blocked_lock(nbl);
8297 }
8298 if (nf)
8299 nfsd_file_put(nf);
8300 if (lock_stp) {
8301 /* Bump seqid manually if the 4.0 replay owner is openowner */
8302 if (cstate->replay_owner &&
8303 cstate->replay_owner != &lock_sop->lo_owner &&
8304 seqid_mutating_err(ntohl(status)))
8305 lock_sop->lo_owner.so_seqid++;
8306
8307 /*
8308 * If this is a new, never-before-used stateid, and we are
8309 * returning an error, then just go ahead and release it.
8310 */
8311 if (status && new)
8312 release_lock_stateid(lock_stp);
8313
8314 mutex_unlock(&lock_stp->st_mutex);
8315
8316 nfs4_put_stid(&lock_stp->st_stid);
8317 }
8318 if (open_stp)
8319 nfs4_put_stid(&open_stp->st_stid);
8320 nfsd4_bump_seqid(cstate, status);
8321 if (conflock)
8322 locks_free_lock(conflock);
8323 return status;
8324 }
8325
nfsd4_lock_release(union nfsd4_op_u * u)8326 void nfsd4_lock_release(union nfsd4_op_u *u)
8327 {
8328 struct nfsd4_lock *lock = &u->lock;
8329 struct nfsd4_lock_denied *deny = &lock->lk_denied;
8330
8331 kfree(deny->ld_owner.data);
8332 }
8333
8334 /*
8335 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
8336 * so we do a temporary open here just to get an open file to pass to
8337 * vfs_test_lock.
8338 */
nfsd_test_lock(struct svc_rqst * rqstp,struct svc_fh * fhp,struct file_lock * lock)8339 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
8340 {
8341 struct nfsd_file *nf;
8342 struct inode *inode;
8343 __be32 err;
8344
8345 err = nfsd_file_acquire(rqstp, fhp, NFSD_MAY_READ, &nf);
8346 if (err)
8347 return err;
8348 inode = fhp->fh_dentry->d_inode;
8349 inode_lock(inode); /* to block new leases till after test_lock: */
8350 err = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ));
8351 if (err)
8352 goto out;
8353 lock->c.flc_file = nf->nf_file;
8354 err = nfserrno(vfs_test_lock(nf->nf_file, lock));
8355 lock->c.flc_file = NULL;
8356 out:
8357 inode_unlock(inode);
8358 nfsd_file_put(nf);
8359 return err;
8360 }
8361
8362 /*
8363 * LOCKT operation
8364 */
8365 __be32
nfsd4_lockt(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8366 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
8367 union nfsd4_op_u *u)
8368 {
8369 struct nfsd4_lockt *lockt = &u->lockt;
8370 struct file_lock *file_lock = NULL;
8371 struct nfs4_lockowner *lo = NULL;
8372 __be32 status;
8373 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
8374
8375 if (locks_in_grace(SVC_NET(rqstp)))
8376 return nfserr_grace;
8377
8378 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
8379 return nfserr_inval;
8380
8381 if (!nfsd4_has_session(cstate)) {
8382 status = set_client(&lockt->lt_clientid, cstate, nn);
8383 if (status)
8384 goto out;
8385 }
8386
8387 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
8388 goto out;
8389
8390 file_lock = locks_alloc_lock();
8391 if (!file_lock) {
8392 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
8393 status = nfserr_jukebox;
8394 goto out;
8395 }
8396
8397 switch (lockt->lt_type) {
8398 case NFS4_READ_LT:
8399 case NFS4_READW_LT:
8400 file_lock->c.flc_type = F_RDLCK;
8401 break;
8402 case NFS4_WRITE_LT:
8403 case NFS4_WRITEW_LT:
8404 file_lock->c.flc_type = F_WRLCK;
8405 break;
8406 default:
8407 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
8408 status = nfserr_inval;
8409 goto out;
8410 }
8411
8412 lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
8413 if (lo)
8414 file_lock->c.flc_owner = (fl_owner_t)lo;
8415 file_lock->c.flc_pid = current->tgid;
8416 file_lock->c.flc_flags = FL_POSIX;
8417
8418 file_lock->fl_start = lockt->lt_offset;
8419 file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
8420
8421 nfs4_transform_lock_offset(file_lock);
8422
8423 status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
8424 if (status)
8425 goto out;
8426
8427 if (file_lock->c.flc_type != F_UNLCK) {
8428 status = nfserr_denied;
8429 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
8430 }
8431 out:
8432 if (lo)
8433 nfs4_put_stateowner(&lo->lo_owner);
8434 if (file_lock)
8435 locks_free_lock(file_lock);
8436 return status;
8437 }
8438
nfsd4_lockt_release(union nfsd4_op_u * u)8439 void nfsd4_lockt_release(union nfsd4_op_u *u)
8440 {
8441 struct nfsd4_lockt *lockt = &u->lockt;
8442 struct nfsd4_lock_denied *deny = &lockt->lt_denied;
8443
8444 kfree(deny->ld_owner.data);
8445 }
8446
8447 __be32
nfsd4_locku(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8448 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
8449 union nfsd4_op_u *u)
8450 {
8451 struct nfsd4_locku *locku = &u->locku;
8452 struct nfs4_ol_stateid *stp;
8453 struct nfsd_file *nf = NULL;
8454 struct file_lock *file_lock = NULL;
8455 __be32 status;
8456 int err;
8457 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
8458
8459 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
8460 (long long) locku->lu_offset,
8461 (long long) locku->lu_length);
8462
8463 if (check_lock_length(locku->lu_offset, locku->lu_length))
8464 return nfserr_inval;
8465
8466 status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
8467 &locku->lu_stateid, SC_TYPE_LOCK, 0,
8468 &stp, nn);
8469 if (status)
8470 goto out;
8471 nf = find_any_file(stp->st_stid.sc_file);
8472 if (!nf) {
8473 status = nfserr_lock_range;
8474 goto put_stateid;
8475 }
8476 file_lock = locks_alloc_lock();
8477 if (!file_lock) {
8478 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
8479 status = nfserr_jukebox;
8480 goto put_file;
8481 }
8482
8483 file_lock->c.flc_type = F_UNLCK;
8484 file_lock->c.flc_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
8485 file_lock->c.flc_pid = current->tgid;
8486 file_lock->c.flc_file = nf->nf_file;
8487 file_lock->c.flc_flags = FL_POSIX;
8488 file_lock->fl_lmops = &nfsd_posix_mng_ops;
8489 file_lock->fl_start = locku->lu_offset;
8490
8491 file_lock->fl_end = last_byte_offset(locku->lu_offset,
8492 locku->lu_length);
8493 nfs4_transform_lock_offset(file_lock);
8494
8495 err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, NULL);
8496 if (err) {
8497 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
8498 goto out_nfserr;
8499 }
8500 nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
8501 put_file:
8502 nfsd_file_put(nf);
8503 put_stateid:
8504 mutex_unlock(&stp->st_mutex);
8505 nfs4_put_stid(&stp->st_stid);
8506 out:
8507 nfsd4_bump_seqid(cstate, status);
8508 if (file_lock)
8509 locks_free_lock(file_lock);
8510 return status;
8511
8512 out_nfserr:
8513 status = nfserrno(err);
8514 goto put_file;
8515 }
8516
8517 /*
8518 * returns
8519 * true: locks held by lockowner
8520 * false: no locks held by lockowner
8521 */
8522 static bool
check_for_locks(struct nfs4_file * fp,struct nfs4_lockowner * lowner)8523 check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
8524 {
8525 struct file_lock *fl;
8526 int status = false;
8527 struct nfsd_file *nf;
8528 struct inode *inode;
8529 struct file_lock_context *flctx;
8530
8531 spin_lock(&fp->fi_lock);
8532 nf = find_any_file_locked(fp);
8533 if (!nf) {
8534 /* Any valid lock stateid should have some sort of access */
8535 WARN_ON_ONCE(1);
8536 goto out;
8537 }
8538
8539 inode = file_inode(nf->nf_file);
8540 flctx = locks_inode_context(inode);
8541
8542 if (flctx && !list_empty_careful(&flctx->flc_posix)) {
8543 spin_lock(&flctx->flc_lock);
8544 for_each_file_lock(fl, &flctx->flc_posix) {
8545 if (fl->c.flc_owner == (fl_owner_t)lowner) {
8546 status = true;
8547 break;
8548 }
8549 }
8550 spin_unlock(&flctx->flc_lock);
8551 }
8552 out:
8553 spin_unlock(&fp->fi_lock);
8554 return status;
8555 }
8556
8557 /**
8558 * nfsd4_release_lockowner - process NFSv4.0 RELEASE_LOCKOWNER operations
8559 * @rqstp: RPC transaction
8560 * @cstate: NFSv4 COMPOUND state
8561 * @u: RELEASE_LOCKOWNER arguments
8562 *
8563 * Check if there are any locks still held and if not, free the lockowner
8564 * and any lock state that is owned.
8565 *
8566 * Return values:
8567 * %nfs_ok: lockowner released or not found
8568 * %nfserr_locks_held: lockowner still in use
8569 * %nfserr_stale_clientid: clientid no longer active
8570 * %nfserr_expired: clientid not recognized
8571 */
8572 __be32
nfsd4_release_lockowner(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8573 nfsd4_release_lockowner(struct svc_rqst *rqstp,
8574 struct nfsd4_compound_state *cstate,
8575 union nfsd4_op_u *u)
8576 {
8577 struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
8578 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
8579 clientid_t *clid = &rlockowner->rl_clientid;
8580 struct nfs4_ol_stateid *stp;
8581 struct nfs4_lockowner *lo;
8582 struct nfs4_client *clp;
8583 LIST_HEAD(reaplist);
8584 __be32 status;
8585
8586 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
8587 clid->cl_boot, clid->cl_id);
8588
8589 status = set_client(clid, cstate, nn);
8590 if (status)
8591 return status;
8592 clp = cstate->clp;
8593
8594 spin_lock(&clp->cl_lock);
8595 lo = find_lockowner_str_locked(clp, &rlockowner->rl_owner);
8596 if (!lo) {
8597 spin_unlock(&clp->cl_lock);
8598 return nfs_ok;
8599 }
8600
8601 list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) {
8602 if (check_for_locks(stp->st_stid.sc_file, lo)) {
8603 spin_unlock(&clp->cl_lock);
8604 nfs4_put_stateowner(&lo->lo_owner);
8605 return nfserr_locks_held;
8606 }
8607 }
8608 unhash_lockowner_locked(lo);
8609 while (!list_empty(&lo->lo_owner.so_stateids)) {
8610 stp = list_first_entry(&lo->lo_owner.so_stateids,
8611 struct nfs4_ol_stateid,
8612 st_perstateowner);
8613 unhash_lock_stateid(stp);
8614 put_ol_stateid_locked(stp, &reaplist);
8615 }
8616 spin_unlock(&clp->cl_lock);
8617
8618 free_ol_stateid_reaplist(&reaplist);
8619 remove_blocked_locks(lo);
8620 nfs4_put_stateowner(&lo->lo_owner);
8621 return nfs_ok;
8622 }
8623
8624 static inline struct nfs4_client_reclaim *
alloc_reclaim(void)8625 alloc_reclaim(void)
8626 {
8627 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
8628 }
8629
8630 bool
nfs4_has_reclaimed_state(struct xdr_netobj name,struct nfsd_net * nn)8631 nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn)
8632 {
8633 struct nfs4_client_reclaim *crp;
8634
8635 crp = nfsd4_find_reclaim_client(name, nn);
8636 return (crp && crp->cr_clp);
8637 }
8638
8639 /*
8640 * failure => all reset bets are off, nfserr_no_grace...
8641 *
8642 * The caller is responsible for freeing name.data if NULL is returned (it
8643 * will be freed in nfs4_remove_reclaim_record in the normal case).
8644 */
8645 struct nfs4_client_reclaim *
nfs4_client_to_reclaim(struct xdr_netobj name,struct xdr_netobj princhash,struct nfsd_net * nn)8646 nfs4_client_to_reclaim(struct xdr_netobj name, struct xdr_netobj princhash,
8647 struct nfsd_net *nn)
8648 {
8649 unsigned int strhashval;
8650 struct nfs4_client_reclaim *crp;
8651
8652 crp = alloc_reclaim();
8653 if (crp) {
8654 strhashval = clientstr_hashval(name);
8655 INIT_LIST_HEAD(&crp->cr_strhash);
8656 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
8657 crp->cr_name.data = name.data;
8658 crp->cr_name.len = name.len;
8659 crp->cr_princhash.data = princhash.data;
8660 crp->cr_princhash.len = princhash.len;
8661 crp->cr_clp = NULL;
8662 nn->reclaim_str_hashtbl_size++;
8663 }
8664 return crp;
8665 }
8666
8667 void
nfs4_remove_reclaim_record(struct nfs4_client_reclaim * crp,struct nfsd_net * nn)8668 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
8669 {
8670 list_del(&crp->cr_strhash);
8671 kfree(crp->cr_name.data);
8672 kfree(crp->cr_princhash.data);
8673 kfree(crp);
8674 nn->reclaim_str_hashtbl_size--;
8675 }
8676
8677 void
nfs4_release_reclaim(struct nfsd_net * nn)8678 nfs4_release_reclaim(struct nfsd_net *nn)
8679 {
8680 struct nfs4_client_reclaim *crp = NULL;
8681 int i;
8682
8683 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
8684 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
8685 crp = list_entry(nn->reclaim_str_hashtbl[i].next,
8686 struct nfs4_client_reclaim, cr_strhash);
8687 nfs4_remove_reclaim_record(crp, nn);
8688 }
8689 }
8690 WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
8691 }
8692
8693 /*
8694 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
8695 struct nfs4_client_reclaim *
nfsd4_find_reclaim_client(struct xdr_netobj name,struct nfsd_net * nn)8696 nfsd4_find_reclaim_client(struct xdr_netobj name, struct nfsd_net *nn)
8697 {
8698 unsigned int strhashval;
8699 struct nfs4_client_reclaim *crp = NULL;
8700
8701 strhashval = clientstr_hashval(name);
8702 list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
8703 if (compare_blob(&crp->cr_name, &name) == 0) {
8704 return crp;
8705 }
8706 }
8707 return NULL;
8708 }
8709
8710 __be32
nfs4_check_open_reclaim(struct nfs4_client * clp)8711 nfs4_check_open_reclaim(struct nfs4_client *clp)
8712 {
8713 if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
8714 return nfserr_no_grace;
8715
8716 if (nfsd4_client_record_check(clp))
8717 return nfserr_reclaim_bad;
8718
8719 return nfs_ok;
8720 }
8721
8722 /*
8723 * Since the lifetime of a delegation isn't limited to that of an open, a
8724 * client may quite reasonably hang on to a delegation as long as it has
8725 * the inode cached. This becomes an obvious problem the first time a
8726 * client's inode cache approaches the size of the server's total memory.
8727 *
8728 * For now we avoid this problem by imposing a hard limit on the number
8729 * of delegations, which varies according to the server's memory size.
8730 */
8731 static void
set_max_delegations(void)8732 set_max_delegations(void)
8733 {
8734 /*
8735 * Allow at most 4 delegations per megabyte of RAM. Quick
8736 * estimates suggest that in the worst case (where every delegation
8737 * is for a different inode), a delegation could take about 1.5K,
8738 * giving a worst case usage of about 6% of memory.
8739 */
8740 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
8741 }
8742
nfs4_state_create_net(struct net * net)8743 static int nfs4_state_create_net(struct net *net)
8744 {
8745 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8746 int i;
8747
8748 nn->conf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
8749 sizeof(struct list_head),
8750 GFP_KERNEL);
8751 if (!nn->conf_id_hashtbl)
8752 goto err;
8753 nn->unconf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
8754 sizeof(struct list_head),
8755 GFP_KERNEL);
8756 if (!nn->unconf_id_hashtbl)
8757 goto err_unconf_id;
8758 nn->sessionid_hashtbl = kmalloc_array(SESSION_HASH_SIZE,
8759 sizeof(struct list_head),
8760 GFP_KERNEL);
8761 if (!nn->sessionid_hashtbl)
8762 goto err_sessionid;
8763
8764 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
8765 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
8766 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
8767 }
8768 for (i = 0; i < SESSION_HASH_SIZE; i++)
8769 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
8770 nn->conf_name_tree = RB_ROOT;
8771 nn->unconf_name_tree = RB_ROOT;
8772 nn->boot_time = ktime_get_real_seconds();
8773 nn->grace_ended = false;
8774 nn->nfsd4_manager.block_opens = true;
8775 INIT_LIST_HEAD(&nn->nfsd4_manager.list);
8776 INIT_LIST_HEAD(&nn->client_lru);
8777 INIT_LIST_HEAD(&nn->close_lru);
8778 INIT_LIST_HEAD(&nn->del_recall_lru);
8779 spin_lock_init(&nn->client_lock);
8780 spin_lock_init(&nn->s2s_cp_lock);
8781 idr_init(&nn->s2s_cp_stateids);
8782 atomic_set(&nn->pending_async_copies, 0);
8783
8784 spin_lock_init(&nn->blocked_locks_lock);
8785 INIT_LIST_HEAD(&nn->blocked_locks_lru);
8786
8787 INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
8788 INIT_WORK(&nn->nfsd_shrinker_work, nfsd4_state_shrinker_worker);
8789 get_net(net);
8790
8791 nn->nfsd_client_shrinker = shrinker_alloc(0, "nfsd-client");
8792 if (!nn->nfsd_client_shrinker)
8793 goto err_shrinker;
8794
8795 nn->nfsd_client_shrinker->scan_objects = nfsd4_state_shrinker_scan;
8796 nn->nfsd_client_shrinker->count_objects = nfsd4_state_shrinker_count;
8797 nn->nfsd_client_shrinker->private_data = nn;
8798
8799 shrinker_register(nn->nfsd_client_shrinker);
8800
8801 return 0;
8802
8803 err_shrinker:
8804 put_net(net);
8805 kfree(nn->sessionid_hashtbl);
8806 err_sessionid:
8807 kfree(nn->unconf_id_hashtbl);
8808 err_unconf_id:
8809 kfree(nn->conf_id_hashtbl);
8810 err:
8811 return -ENOMEM;
8812 }
8813
8814 static void
nfs4_state_destroy_net(struct net * net)8815 nfs4_state_destroy_net(struct net *net)
8816 {
8817 int i;
8818 struct nfs4_client *clp = NULL;
8819 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8820
8821 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
8822 while (!list_empty(&nn->conf_id_hashtbl[i])) {
8823 clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
8824 destroy_client(clp);
8825 }
8826 }
8827
8828 WARN_ON(!list_empty(&nn->blocked_locks_lru));
8829
8830 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
8831 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
8832 clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
8833 destroy_client(clp);
8834 }
8835 }
8836
8837 kfree(nn->sessionid_hashtbl);
8838 kfree(nn->unconf_id_hashtbl);
8839 kfree(nn->conf_id_hashtbl);
8840 put_net(net);
8841 }
8842
8843 int
nfs4_state_start_net(struct net * net)8844 nfs4_state_start_net(struct net *net)
8845 {
8846 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8847 int ret;
8848
8849 ret = nfs4_state_create_net(net);
8850 if (ret)
8851 return ret;
8852 locks_start_grace(net, &nn->nfsd4_manager);
8853 nfsd4_client_tracking_init(net);
8854 if (nn->track_reclaim_completes && nn->reclaim_str_hashtbl_size == 0)
8855 goto skip_grace;
8856 printk(KERN_INFO "NFSD: starting %lld-second grace period (net %x)\n",
8857 nn->nfsd4_grace, net->ns.inum);
8858 trace_nfsd_grace_start(nn);
8859 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
8860 return 0;
8861
8862 skip_grace:
8863 printk(KERN_INFO "NFSD: no clients to reclaim, skipping NFSv4 grace period (net %x)\n",
8864 net->ns.inum);
8865 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_lease * HZ);
8866 nfsd4_end_grace(nn);
8867 return 0;
8868 }
8869
8870 /* initialization to perform when the nfsd service is started: */
8871 int
nfs4_state_start(void)8872 nfs4_state_start(void)
8873 {
8874 int ret;
8875
8876 ret = rhltable_init(&nfs4_file_rhltable, &nfs4_file_rhash_params);
8877 if (ret)
8878 return ret;
8879
8880 nfsd_slot_shrinker = shrinker_alloc(0, "nfsd-DRC-slot");
8881 if (!nfsd_slot_shrinker) {
8882 rhltable_destroy(&nfs4_file_rhltable);
8883 return -ENOMEM;
8884 }
8885 nfsd_slot_shrinker->count_objects = nfsd_slot_count;
8886 nfsd_slot_shrinker->scan_objects = nfsd_slot_scan;
8887 shrinker_register(nfsd_slot_shrinker);
8888
8889 set_max_delegations();
8890 return 0;
8891 }
8892
8893 void
nfs4_state_shutdown_net(struct net * net)8894 nfs4_state_shutdown_net(struct net *net)
8895 {
8896 struct nfs4_delegation *dp = NULL;
8897 struct list_head *pos, *next, reaplist;
8898 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8899
8900 shrinker_free(nn->nfsd_client_shrinker);
8901 cancel_work_sync(&nn->nfsd_shrinker_work);
8902 cancel_delayed_work_sync(&nn->laundromat_work);
8903 locks_end_grace(&nn->nfsd4_manager);
8904
8905 INIT_LIST_HEAD(&reaplist);
8906 spin_lock(&state_lock);
8907 list_for_each_safe(pos, next, &nn->del_recall_lru) {
8908 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
8909 unhash_delegation_locked(dp, SC_STATUS_CLOSED);
8910 list_add(&dp->dl_recall_lru, &reaplist);
8911 }
8912 spin_unlock(&state_lock);
8913 list_for_each_safe(pos, next, &reaplist) {
8914 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
8915 list_del_init(&dp->dl_recall_lru);
8916 destroy_unhashed_deleg(dp);
8917 }
8918
8919 nfsd4_client_tracking_exit(net);
8920 nfs4_state_destroy_net(net);
8921 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
8922 nfsd4_ssc_shutdown_umount(nn);
8923 #endif
8924 }
8925
8926 void
nfs4_state_shutdown(void)8927 nfs4_state_shutdown(void)
8928 {
8929 rhltable_destroy(&nfs4_file_rhltable);
8930 shrinker_free(nfsd_slot_shrinker);
8931 }
8932
8933 static void
get_stateid(struct nfsd4_compound_state * cstate,stateid_t * stateid)8934 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
8935 {
8936 if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG) &&
8937 CURRENT_STATEID(stateid))
8938 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
8939 }
8940
8941 static void
put_stateid(struct nfsd4_compound_state * cstate,stateid_t * stateid)8942 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
8943 {
8944 if (cstate->minorversion) {
8945 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
8946 SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
8947 }
8948 }
8949
8950 void
clear_current_stateid(struct nfsd4_compound_state * cstate)8951 clear_current_stateid(struct nfsd4_compound_state *cstate)
8952 {
8953 CLEAR_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
8954 }
8955
8956 /*
8957 * functions to set current state id
8958 */
8959 void
nfsd4_set_opendowngradestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8960 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate,
8961 union nfsd4_op_u *u)
8962 {
8963 put_stateid(cstate, &u->open_downgrade.od_stateid);
8964 }
8965
8966 void
nfsd4_set_openstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8967 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate,
8968 union nfsd4_op_u *u)
8969 {
8970 put_stateid(cstate, &u->open.op_stateid);
8971 }
8972
8973 void
nfsd4_set_closestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8974 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate,
8975 union nfsd4_op_u *u)
8976 {
8977 put_stateid(cstate, &u->close.cl_stateid);
8978 }
8979
8980 void
nfsd4_set_lockstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8981 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate,
8982 union nfsd4_op_u *u)
8983 {
8984 put_stateid(cstate, &u->lock.lk_resp_stateid);
8985 }
8986
8987 /*
8988 * functions to consume current state id
8989 */
8990
8991 void
nfsd4_get_opendowngradestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8992 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate,
8993 union nfsd4_op_u *u)
8994 {
8995 get_stateid(cstate, &u->open_downgrade.od_stateid);
8996 }
8997
8998 void
nfsd4_get_delegreturnstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8999 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate,
9000 union nfsd4_op_u *u)
9001 {
9002 get_stateid(cstate, &u->delegreturn.dr_stateid);
9003 }
9004
9005 void
nfsd4_get_freestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)9006 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate,
9007 union nfsd4_op_u *u)
9008 {
9009 get_stateid(cstate, &u->free_stateid.fr_stateid);
9010 }
9011
9012 void
nfsd4_get_setattrstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)9013 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate,
9014 union nfsd4_op_u *u)
9015 {
9016 get_stateid(cstate, &u->setattr.sa_stateid);
9017 }
9018
9019 void
nfsd4_get_closestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)9020 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate,
9021 union nfsd4_op_u *u)
9022 {
9023 get_stateid(cstate, &u->close.cl_stateid);
9024 }
9025
9026 void
nfsd4_get_lockustateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)9027 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate,
9028 union nfsd4_op_u *u)
9029 {
9030 get_stateid(cstate, &u->locku.lu_stateid);
9031 }
9032
9033 void
nfsd4_get_readstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)9034 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate,
9035 union nfsd4_op_u *u)
9036 {
9037 get_stateid(cstate, &u->read.rd_stateid);
9038 }
9039
9040 void
nfsd4_get_writestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)9041 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate,
9042 union nfsd4_op_u *u)
9043 {
9044 get_stateid(cstate, &u->write.wr_stateid);
9045 }
9046
9047 /**
9048 * set_cb_time - vet and set the timespec for a cb_getattr update
9049 * @cb: timestamp from the CB_GETATTR response
9050 * @orig: original timestamp in the inode
9051 * @now: current time
9052 *
9053 * Given a timestamp in a CB_GETATTR response, check it against the
9054 * current timestamp in the inode and the current time. Returns true
9055 * if the inode's timestamp needs to be updated, and false otherwise.
9056 * @cb may also be changed if the timestamp needs to be clamped.
9057 */
set_cb_time(struct timespec64 * cb,const struct timespec64 * orig,const struct timespec64 * now)9058 static bool set_cb_time(struct timespec64 *cb, const struct timespec64 *orig,
9059 const struct timespec64 *now)
9060 {
9061
9062 /*
9063 * "When the time presented is before the original time, then the
9064 * update is ignored." Also no need to update if there is no change.
9065 */
9066 if (timespec64_compare(cb, orig) <= 0)
9067 return false;
9068
9069 /*
9070 * "When the time presented is in the future, the server can either
9071 * clamp the new time to the current time, or it may
9072 * return NFS4ERR_DELAY to the client, allowing it to retry."
9073 */
9074 if (timespec64_compare(cb, now) > 0) {
9075 /* clamp it */
9076 *cb = *now;
9077 }
9078
9079 return true;
9080 }
9081
cb_getattr_update_times(struct dentry * dentry,struct nfs4_delegation * dp)9082 static int cb_getattr_update_times(struct dentry *dentry, struct nfs4_delegation *dp)
9083 {
9084 struct inode *inode = d_inode(dentry);
9085 struct timespec64 now = current_time(inode);
9086 struct nfs4_cb_fattr *ncf = &dp->dl_cb_fattr;
9087 struct iattr attrs = { };
9088 int ret;
9089
9090 if (deleg_attrs_deleg(dp->dl_type)) {
9091 struct timespec64 atime = inode_get_atime(inode);
9092 struct timespec64 mtime = inode_get_mtime(inode);
9093
9094 attrs.ia_atime = ncf->ncf_cb_atime;
9095 attrs.ia_mtime = ncf->ncf_cb_mtime;
9096
9097 if (set_cb_time(&attrs.ia_atime, &atime, &now))
9098 attrs.ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
9099
9100 if (set_cb_time(&attrs.ia_mtime, &mtime, &now)) {
9101 attrs.ia_valid |= ATTR_CTIME | ATTR_MTIME | ATTR_MTIME_SET;
9102 attrs.ia_ctime = attrs.ia_mtime;
9103 }
9104 } else {
9105 attrs.ia_valid |= ATTR_MTIME | ATTR_CTIME;
9106 attrs.ia_mtime = attrs.ia_ctime = now;
9107 }
9108
9109 if (!attrs.ia_valid)
9110 return 0;
9111
9112 attrs.ia_valid |= ATTR_DELEG;
9113 inode_lock(inode);
9114 ret = notify_change(&nop_mnt_idmap, dentry, &attrs, NULL);
9115 inode_unlock(inode);
9116 return ret;
9117 }
9118
9119 /**
9120 * nfsd4_deleg_getattr_conflict - Recall if GETATTR causes conflict
9121 * @rqstp: RPC transaction context
9122 * @dentry: dentry of inode to be checked for a conflict
9123 * @pdp: returned WRITE delegation, if one was found
9124 *
9125 * This function is called when there is a conflict between a write
9126 * delegation and a change/size GETATTR from another client. The server
9127 * must either use the CB_GETATTR to get the current values of the
9128 * attributes from the client that holds the delegation or recall the
9129 * delegation before replying to the GETATTR. See RFC 8881 section
9130 * 18.7.4.
9131 *
9132 * Returns 0 if there is no conflict; otherwise an nfs_stat
9133 * code is returned. If @pdp is set to a non-NULL value, then the
9134 * caller must put the reference.
9135 */
9136 __be32
nfsd4_deleg_getattr_conflict(struct svc_rqst * rqstp,struct dentry * dentry,struct nfs4_delegation ** pdp)9137 nfsd4_deleg_getattr_conflict(struct svc_rqst *rqstp, struct dentry *dentry,
9138 struct nfs4_delegation **pdp)
9139 {
9140 __be32 status;
9141 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
9142 struct file_lock_context *ctx;
9143 struct nfs4_delegation *dp = NULL;
9144 struct file_lease *fl;
9145 struct nfs4_cb_fattr *ncf;
9146 struct inode *inode = d_inode(dentry);
9147
9148 ctx = locks_inode_context(inode);
9149 if (!ctx)
9150 return nfs_ok;
9151
9152 #define NON_NFSD_LEASE ((void *)1)
9153
9154 spin_lock(&ctx->flc_lock);
9155 for_each_file_lock(fl, &ctx->flc_lease) {
9156 if (fl->c.flc_flags == FL_LAYOUT)
9157 continue;
9158 if (fl->c.flc_type == F_WRLCK) {
9159 if (fl->fl_lmops == &nfsd_lease_mng_ops)
9160 dp = fl->c.flc_owner;
9161 else
9162 dp = NON_NFSD_LEASE;
9163 }
9164 break;
9165 }
9166 if (dp == NULL || dp == NON_NFSD_LEASE ||
9167 dp->dl_recall.cb_clp == *(rqstp->rq_lease_breaker)) {
9168 spin_unlock(&ctx->flc_lock);
9169 if (dp == NON_NFSD_LEASE) {
9170 status = nfserrno(nfsd_open_break_lease(inode,
9171 NFSD_MAY_READ));
9172 if (status != nfserr_jukebox ||
9173 !nfsd_wait_for_delegreturn(rqstp, inode))
9174 return status;
9175 }
9176 return 0;
9177 }
9178
9179 nfsd_stats_wdeleg_getattr_inc(nn);
9180 refcount_inc(&dp->dl_stid.sc_count);
9181 ncf = &dp->dl_cb_fattr;
9182 nfs4_cb_getattr(&dp->dl_cb_fattr);
9183 spin_unlock(&ctx->flc_lock);
9184
9185 wait_on_bit_timeout(&ncf->ncf_cb_flags, CB_GETATTR_BUSY,
9186 TASK_INTERRUPTIBLE, NFSD_CB_GETATTR_TIMEOUT);
9187 if (ncf->ncf_cb_status) {
9188 /* Recall delegation only if client didn't respond */
9189 status = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ));
9190 if (status != nfserr_jukebox ||
9191 !nfsd_wait_for_delegreturn(rqstp, inode))
9192 goto out_status;
9193 }
9194 if (!ncf->ncf_file_modified &&
9195 (ncf->ncf_initial_cinfo != ncf->ncf_cb_change ||
9196 ncf->ncf_cur_fsize != ncf->ncf_cb_fsize))
9197 ncf->ncf_file_modified = true;
9198 if (ncf->ncf_file_modified) {
9199 int err;
9200
9201 /*
9202 * Per section 10.4.3 of RFC 8881, the server would
9203 * not update the file's metadata with the client's
9204 * modified size
9205 */
9206 err = cb_getattr_update_times(dentry, dp);
9207 if (err) {
9208 status = nfserrno(err);
9209 goto out_status;
9210 }
9211 ncf->ncf_cur_fsize = ncf->ncf_cb_fsize;
9212 *pdp = dp;
9213 return nfs_ok;
9214 }
9215 status = nfs_ok;
9216 out_status:
9217 nfs4_put_stid(&dp->dl_stid);
9218 return status;
9219 }
9220