1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Rick Macklem at The University of Guelph.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * from nfs_vnops.c 8.16 (Berkeley) 5/27/95
35 */
36
37 #include <sys/cdefs.h>
38 /*
39 * vnode op calls for Sun NFS version 2, 3 and 4
40 */
41
42 #include "opt_inet.h"
43
44 #include <sys/param.h>
45 #include <sys/kernel.h>
46 #include <sys/systm.h>
47 #include <sys/resourcevar.h>
48 #include <sys/proc.h>
49 #include <sys/mount.h>
50 #include <sys/bio.h>
51 #include <sys/buf.h>
52 #include <sys/extattr.h>
53 #include <sys/filio.h>
54 #include <sys/jail.h>
55 #include <sys/malloc.h>
56 #include <sys/mbuf.h>
57 #include <sys/namei.h>
58 #include <sys/socket.h>
59 #include <sys/vnode.h>
60 #include <sys/dirent.h>
61 #include <sys/fcntl.h>
62 #include <sys/lockf.h>
63 #include <sys/stat.h>
64 #include <sys/sysctl.h>
65 #include <sys/signalvar.h>
66
67 #include <vm/vm.h>
68 #include <vm/vm_extern.h>
69 #include <vm/vm_object.h>
70 #include <vm/vnode_pager.h>
71
72 #include <fs/nfs/nfsport.h>
73 #include <fs/nfsclient/nfsnode.h>
74 #include <fs/nfsclient/nfsmount.h>
75 #include <fs/nfsclient/nfs.h>
76 #include <fs/nfsclient/nfs_kdtrace.h>
77
78 #include <net/if.h>
79 #include <netinet/in.h>
80 #include <netinet/in_var.h>
81
82 #include <nfs/nfs_lock.h>
83
84 #ifdef KDTRACE_HOOKS
85 #include <sys/dtrace_bsd.h>
86
87 dtrace_nfsclient_accesscache_flush_probe_func_t
88 dtrace_nfscl_accesscache_flush_done_probe;
89 uint32_t nfscl_accesscache_flush_done_id;
90
91 dtrace_nfsclient_accesscache_get_probe_func_t
92 dtrace_nfscl_accesscache_get_hit_probe,
93 dtrace_nfscl_accesscache_get_miss_probe;
94 uint32_t nfscl_accesscache_get_hit_id;
95 uint32_t nfscl_accesscache_get_miss_id;
96
97 dtrace_nfsclient_accesscache_load_probe_func_t
98 dtrace_nfscl_accesscache_load_done_probe;
99 uint32_t nfscl_accesscache_load_done_id;
100 #endif /* !KDTRACE_HOOKS */
101
102 /* Defs */
103 #define TRUE 1
104 #define FALSE 0
105
106 extern struct nfsstatsv1 nfsstatsv1;
107 extern int nfsrv_useacl;
108 extern int nfscl_debuglevel;
109 NFSCLSTATEMUTEX;
110 MALLOC_DECLARE(M_NEWNFSREQ);
111
112 static vop_read_t nfsfifo_read;
113 static vop_write_t nfsfifo_write;
114 static vop_close_t nfsfifo_close;
115 static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *,
116 struct thread *);
117 static int nfs_get_namedattrdir(struct vnode *, struct componentname *,
118 struct vnode **);
119 static vop_lookup_t nfs_lookup;
120 static vop_create_t nfs_create;
121 static vop_mknod_t nfs_mknod;
122 static vop_open_t nfs_open;
123 static vop_pathconf_t nfs_pathconf;
124 static vop_close_t nfs_close;
125 static vop_access_t nfs_access;
126 static vop_getattr_t nfs_getattr;
127 static vop_setattr_t nfs_setattr;
128 static vop_read_t nfs_read;
129 static vop_fsync_t nfs_fsync;
130 static vop_remove_t nfs_remove;
131 static vop_link_t nfs_link;
132 static vop_rename_t nfs_rename;
133 static vop_mkdir_t nfs_mkdir;
134 static vop_rmdir_t nfs_rmdir;
135 static vop_symlink_t nfs_symlink;
136 static vop_readdir_t nfs_readdir;
137 static vop_strategy_t nfs_strategy;
138 static int nfs_lookitup(struct vnode *, char *, int,
139 struct ucred *, struct thread *, struct nfsnode **);
140 static int nfs_sillyrename(struct vnode *, struct vnode *,
141 struct componentname *);
142 static vop_access_t nfsspec_access;
143 static vop_readlink_t nfs_readlink;
144 static vop_print_t nfs_print;
145 static vop_advlock_t nfs_advlock;
146 static vop_advlockasync_t nfs_advlockasync;
147 static vop_getacl_t nfs_getacl;
148 static vop_setacl_t nfs_setacl;
149 static vop_advise_t nfs_advise;
150 static vop_allocate_t nfs_allocate;
151 static vop_deallocate_t nfs_deallocate;
152 static vop_copy_file_range_t nfs_copy_file_range;
153 static vop_ioctl_t nfs_ioctl;
154 static vop_getextattr_t nfs_getextattr;
155 static vop_setextattr_t nfs_setextattr;
156 static vop_listextattr_t nfs_listextattr;
157 static vop_deleteextattr_t nfs_deleteextattr;
158 static vop_lock1_t nfs_lock;
159
160 /*
161 * Global vfs data structures for nfs
162 */
163
164 static struct vop_vector newnfs_vnodeops_nosig = {
165 .vop_default = &default_vnodeops,
166 .vop_access = nfs_access,
167 .vop_advlock = nfs_advlock,
168 .vop_advlockasync = nfs_advlockasync,
169 .vop_close = nfs_close,
170 .vop_create = nfs_create,
171 .vop_fsync = nfs_fsync,
172 .vop_getattr = nfs_getattr,
173 .vop_getpages = ncl_getpages,
174 .vop_putpages = ncl_putpages,
175 .vop_inactive = ncl_inactive,
176 .vop_link = nfs_link,
177 .vop_lock1 = nfs_lock,
178 .vop_lookup = nfs_lookup,
179 .vop_mkdir = nfs_mkdir,
180 .vop_mknod = nfs_mknod,
181 .vop_open = nfs_open,
182 .vop_pathconf = nfs_pathconf,
183 .vop_print = nfs_print,
184 .vop_read = nfs_read,
185 .vop_readdir = nfs_readdir,
186 .vop_readlink = nfs_readlink,
187 .vop_reclaim = ncl_reclaim,
188 .vop_remove = nfs_remove,
189 .vop_rename = nfs_rename,
190 .vop_rmdir = nfs_rmdir,
191 .vop_setattr = nfs_setattr,
192 .vop_strategy = nfs_strategy,
193 .vop_symlink = nfs_symlink,
194 .vop_write = ncl_write,
195 .vop_getacl = nfs_getacl,
196 .vop_setacl = nfs_setacl,
197 .vop_advise = nfs_advise,
198 .vop_allocate = nfs_allocate,
199 .vop_deallocate = nfs_deallocate,
200 .vop_copy_file_range = nfs_copy_file_range,
201 .vop_ioctl = nfs_ioctl,
202 .vop_getextattr = nfs_getextattr,
203 .vop_setextattr = nfs_setextattr,
204 .vop_listextattr = nfs_listextattr,
205 .vop_deleteextattr = nfs_deleteextattr,
206 };
207 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops_nosig);
208
209 static int
nfs_vnodeops_bypass(struct vop_generic_args * a)210 nfs_vnodeops_bypass(struct vop_generic_args *a)
211 {
212
213 return (vop_sigdefer(&newnfs_vnodeops_nosig, a));
214 }
215
216 struct vop_vector newnfs_vnodeops = {
217 .vop_default = &default_vnodeops,
218 .vop_bypass = nfs_vnodeops_bypass,
219 };
220 VFS_VOP_VECTOR_REGISTER(newnfs_vnodeops);
221
222 static struct vop_vector newnfs_fifoops_nosig = {
223 .vop_default = &fifo_specops,
224 .vop_access = nfsspec_access,
225 .vop_close = nfsfifo_close,
226 .vop_fsync = nfs_fsync,
227 .vop_getattr = nfs_getattr,
228 .vop_inactive = ncl_inactive,
229 .vop_pathconf = nfs_pathconf,
230 .vop_print = nfs_print,
231 .vop_read = nfsfifo_read,
232 .vop_reclaim = ncl_reclaim,
233 .vop_setattr = nfs_setattr,
234 .vop_write = nfsfifo_write,
235 };
236 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops_nosig);
237
238 static int
nfs_fifoops_bypass(struct vop_generic_args * a)239 nfs_fifoops_bypass(struct vop_generic_args *a)
240 {
241
242 return (vop_sigdefer(&newnfs_fifoops_nosig, a));
243 }
244
245 struct vop_vector newnfs_fifoops = {
246 .vop_default = &default_vnodeops,
247 .vop_bypass = nfs_fifoops_bypass,
248 };
249 VFS_VOP_VECTOR_REGISTER(newnfs_fifoops);
250
251 static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp,
252 struct componentname *cnp, struct vattr *vap);
253 static int nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
254 int namelen, struct ucred *cred, struct thread *td, bool silly);
255 static void nfs_removestatus(struct vnode *vp, nfsremove_status file_status,
256 bool silly, struct thread *td);
257 static int nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp,
258 char *fnameptr, int fnamelen, struct vnode *tdvp, struct vnode *tvp,
259 char *tnameptr, int tnamelen, bool silly, struct ucred *cred,
260 struct thread *td);
261 static int nfs_renameit(struct vnode *sdvp, struct vnode *svp,
262 struct componentname *scnp, struct sillyrename *sp);
263
264 /*
265 * Global variables
266 */
267 SYSCTL_DECL(_vfs_nfs);
268
269 static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO;
270 SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW,
271 &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout");
272
273 static int nfs_prime_access_cache = 0;
274 SYSCTL_INT(_vfs_nfs, OID_AUTO, prime_access_cache, CTLFLAG_RW,
275 &nfs_prime_access_cache, 0,
276 "Prime NFS ACCESS cache when fetching attributes");
277
278 static int newnfs_commit_on_close = 0;
279 SYSCTL_INT(_vfs_nfs, OID_AUTO, commit_on_close, CTLFLAG_RW,
280 &newnfs_commit_on_close, 0, "write+commit on close, else only write");
281
282 static int nfs_clean_pages_on_close = 1;
283 SYSCTL_INT(_vfs_nfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW,
284 &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close");
285
286 int newnfs_directio_enable = 0;
287 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW,
288 &newnfs_directio_enable, 0, "Enable NFS directio");
289
290 int nfs_keep_dirty_on_error;
291 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_keep_dirty_on_error, CTLFLAG_RW,
292 &nfs_keep_dirty_on_error, 0, "Retry pageout if error returned");
293
294 /*
295 * This sysctl allows other processes to mmap a file that has been opened
296 * O_DIRECT by a process. In general, having processes mmap the file while
297 * Direct IO is in progress can lead to Data Inconsistencies. But, we allow
298 * this by default to prevent DoS attacks - to prevent a malicious user from
299 * opening up files O_DIRECT preventing other users from mmap'ing these
300 * files. "Protected" environments where stricter consistency guarantees are
301 * required can disable this knob. The process that opened the file O_DIRECT
302 * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not
303 * meaningful.
304 */
305 int newnfs_directio_allow_mmap = 1;
306 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW,
307 &newnfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens");
308
309 static uint64_t nfs_maxalloclen = 64 * 1024 * 1024;
310 SYSCTL_U64(_vfs_nfs, OID_AUTO, maxalloclen, CTLFLAG_RW,
311 &nfs_maxalloclen, 0, "NFS max allocate/deallocate length");
312
313 #define NFSACCESS_ALL (NFSACCESS_READ | NFSACCESS_MODIFY \
314 | NFSACCESS_EXTEND | NFSACCESS_EXECUTE \
315 | NFSACCESS_DELETE | NFSACCESS_LOOKUP)
316
317 /*
318 * SMP Locking Note :
319 * The list of locks after the description of the lock is the ordering
320 * of other locks acquired with the lock held.
321 * np->n_mtx : Protects the fields in the nfsnode.
322 VM Object Lock
323 VI_MTX (acquired indirectly)
324 * nmp->nm_mtx : Protects the fields in the nfsmount.
325 rep->r_mtx
326 * ncl_iod_mutex : Global lock, protects shared nfsiod state.
327 * nfs_reqq_mtx : Global lock, protects the nfs_reqq list.
328 nmp->nm_mtx
329 rep->r_mtx
330 * rep->r_mtx : Protects the fields in an nfsreq.
331 */
332
333 static int
nfs_lock(struct vop_lock1_args * ap)334 nfs_lock(struct vop_lock1_args *ap)
335 {
336 struct vnode *vp;
337 struct nfsnode *np;
338 u_quad_t nsize;
339 int error, lktype;
340 bool onfault;
341
342 vp = ap->a_vp;
343 lktype = ap->a_flags & LK_TYPE_MASK;
344 error = VOP_LOCK1_APV(&default_vnodeops, ap);
345 if (error != 0 || vp->v_op != &newnfs_vnodeops)
346 return (error);
347 np = VTONFS(vp);
348 if (np == NULL)
349 return (0);
350 NFSLOCKNODE(np);
351 if ((np->n_flag & NVNSETSZSKIP) == 0 || (lktype != LK_SHARED &&
352 lktype != LK_EXCLUSIVE && lktype != LK_UPGRADE &&
353 lktype != LK_TRYUPGRADE)) {
354 NFSUNLOCKNODE(np);
355 return (0);
356 }
357 onfault = (ap->a_flags & LK_EATTR_MASK) == LK_NOWAIT &&
358 (ap->a_flags & LK_INIT_MASK) == LK_CANRECURSE &&
359 (lktype == LK_SHARED || lktype == LK_EXCLUSIVE);
360 if (onfault && vp->v_vnlock->lk_recurse == 0) {
361 /*
362 * Force retry in vm_fault(), to make the lock request
363 * sleepable, which allows us to piggy-back the
364 * sleepable call to vnode_pager_setsize().
365 */
366 NFSUNLOCKNODE(np);
367 VOP_UNLOCK(vp);
368 return (EBUSY);
369 }
370 if ((ap->a_flags & LK_NOWAIT) != 0 ||
371 (lktype == LK_SHARED && vp->v_vnlock->lk_recurse > 0)) {
372 NFSUNLOCKNODE(np);
373 return (0);
374 }
375 if (lktype == LK_SHARED) {
376 NFSUNLOCKNODE(np);
377 VOP_UNLOCK(vp);
378 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK);
379 ap->a_flags |= LK_EXCLUSIVE;
380 error = VOP_LOCK1_APV(&default_vnodeops, ap);
381 if (error != 0 || vp->v_op != &newnfs_vnodeops)
382 return (error);
383 if (vp->v_data == NULL)
384 goto downgrade;
385 MPASS(vp->v_data == np);
386 NFSLOCKNODE(np);
387 if ((np->n_flag & NVNSETSZSKIP) == 0) {
388 NFSUNLOCKNODE(np);
389 goto downgrade;
390 }
391 }
392 np->n_flag &= ~NVNSETSZSKIP;
393 nsize = np->n_size;
394 NFSUNLOCKNODE(np);
395 vnode_pager_setsize(vp, nsize);
396 downgrade:
397 if (lktype == LK_SHARED) {
398 ap->a_flags &= ~(LK_TYPE_MASK | LK_INTERLOCK);
399 ap->a_flags |= LK_DOWNGRADE;
400 (void)VOP_LOCK1_APV(&default_vnodeops, ap);
401 }
402 return (0);
403 }
404
405 static int
nfs34_access_otw(struct vnode * vp,int wmode,struct thread * td,struct ucred * cred,u_int32_t * retmode)406 nfs34_access_otw(struct vnode *vp, int wmode, struct thread *td,
407 struct ucred *cred, u_int32_t *retmode)
408 {
409 int error = 0, attrflag, i, lrupos;
410 u_int32_t rmode;
411 struct nfsnode *np = VTONFS(vp);
412 struct nfsvattr nfsva;
413
414 error = nfsrpc_accessrpc(vp, wmode, cred, td, &nfsva, &attrflag,
415 &rmode);
416 if (attrflag)
417 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
418 if (!error) {
419 lrupos = 0;
420 NFSLOCKNODE(np);
421 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
422 if (np->n_accesscache[i].uid == cred->cr_uid) {
423 np->n_accesscache[i].mode = rmode;
424 np->n_accesscache[i].stamp = time_second;
425 break;
426 }
427 if (i > 0 && np->n_accesscache[i].stamp <
428 np->n_accesscache[lrupos].stamp)
429 lrupos = i;
430 }
431 if (i == NFS_ACCESSCACHESIZE) {
432 np->n_accesscache[lrupos].uid = cred->cr_uid;
433 np->n_accesscache[lrupos].mode = rmode;
434 np->n_accesscache[lrupos].stamp = time_second;
435 }
436 NFSUNLOCKNODE(np);
437 if (retmode != NULL)
438 *retmode = rmode;
439 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0);
440 } else if (NFS_ISV4(vp)) {
441 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
442 }
443 #ifdef KDTRACE_HOOKS
444 if (error != 0)
445 KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0,
446 error);
447 #endif
448 return (error);
449 }
450
451 /*
452 * nfs access vnode op.
453 * For nfs version 2, just return ok. File accesses may fail later.
454 * For nfs version 3, use the access rpc to check accessibility. If file modes
455 * are changed on the server, accesses might still fail later.
456 */
457 static int
nfs_access(struct vop_access_args * ap)458 nfs_access(struct vop_access_args *ap)
459 {
460 struct vnode *vp = ap->a_vp;
461 int error = 0, i, gotahit;
462 u_int32_t mode, wmode, rmode;
463 int v34 = NFS_ISV34(vp);
464 struct nfsnode *np = VTONFS(vp);
465
466 /*
467 * Disallow write attempts on filesystems mounted read-only;
468 * unless the file is a socket, fifo, or a block or character
469 * device resident on the filesystem.
470 */
471 if ((ap->a_accmode & (VWRITE | VAPPEND | VWRITE_NAMED_ATTRS |
472 VDELETE_CHILD | VWRITE_ATTRIBUTES | VDELETE | VWRITE_ACL |
473 VWRITE_OWNER)) != 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) != 0) {
474 switch (vp->v_type) {
475 case VREG:
476 case VDIR:
477 case VLNK:
478 return (EROFS);
479 default:
480 break;
481 }
482 }
483
484 /*
485 * For NFSv4, check for a delegation with an Allow ACE, to see
486 * if that permits access.
487 */
488 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOCTO) != 0) {
489 error = nfscl_delegacecheck(vp, ap->a_accmode, ap->a_cred);
490 if (error == 0)
491 return (error);
492 error = 0;
493 }
494
495 /*
496 * For nfs v3 or v4, check to see if we have done this recently, and if
497 * so return our cached result instead of making an ACCESS call.
498 * If not, do an access rpc, otherwise you are stuck emulating
499 * ufs_access() locally using the vattr. This may not be correct,
500 * since the server may apply other access criteria such as
501 * client uid-->server uid mapping that we do not know about.
502 */
503 if (v34) {
504 if (ap->a_accmode & VREAD)
505 mode = NFSACCESS_READ;
506 else
507 mode = 0;
508 if (vp->v_type != VDIR) {
509 if (ap->a_accmode & VWRITE)
510 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
511 if (ap->a_accmode & VAPPEND)
512 mode |= NFSACCESS_EXTEND;
513 if (ap->a_accmode & VEXEC)
514 mode |= NFSACCESS_EXECUTE;
515 if (ap->a_accmode & VDELETE)
516 mode |= NFSACCESS_DELETE;
517 } else {
518 if (ap->a_accmode & VWRITE)
519 mode |= (NFSACCESS_MODIFY | NFSACCESS_EXTEND);
520 if (ap->a_accmode & VAPPEND)
521 mode |= NFSACCESS_EXTEND;
522 if (ap->a_accmode & VEXEC)
523 mode |= NFSACCESS_LOOKUP;
524 if (ap->a_accmode & VDELETE)
525 mode |= NFSACCESS_DELETE;
526 if (ap->a_accmode & VDELETE_CHILD)
527 mode |= NFSACCESS_MODIFY;
528 }
529 /* XXX safety belt, only make blanket request if caching */
530 if (nfsaccess_cache_timeout > 0) {
531 wmode = NFSACCESS_READ | NFSACCESS_MODIFY |
532 NFSACCESS_EXTEND | NFSACCESS_EXECUTE |
533 NFSACCESS_DELETE | NFSACCESS_LOOKUP;
534 } else {
535 wmode = mode;
536 }
537
538 /*
539 * Does our cached result allow us to give a definite yes to
540 * this request?
541 */
542 gotahit = 0;
543 NFSLOCKNODE(np);
544 for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
545 if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
546 if (time_second < (np->n_accesscache[i].stamp
547 + nfsaccess_cache_timeout) &&
548 (np->n_accesscache[i].mode & mode) == mode) {
549 NFSINCRGLOBAL(nfsstatsv1.accesscache_hits);
550 gotahit = 1;
551 }
552 break;
553 }
554 }
555 NFSUNLOCKNODE(np);
556 #ifdef KDTRACE_HOOKS
557 if (gotahit != 0)
558 KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp,
559 ap->a_cred->cr_uid, mode);
560 else
561 KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp,
562 ap->a_cred->cr_uid, mode);
563 #endif
564 if (gotahit == 0) {
565 /*
566 * Either a no, or a don't know. Go to the wire.
567 */
568 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses);
569 error = nfs34_access_otw(vp, wmode, ap->a_td,
570 ap->a_cred, &rmode);
571 if (!error &&
572 (rmode & mode) != mode)
573 error = EACCES;
574 }
575 return (error);
576 } else {
577 if ((error = nfsspec_access(ap)) != 0) {
578 return (error);
579 }
580 /*
581 * Attempt to prevent a mapped root from accessing a file
582 * which it shouldn't. We try to read a byte from the file
583 * if the user is root and the file is not zero length.
584 * After calling nfsspec_access, we should have the correct
585 * file size cached.
586 */
587 NFSLOCKNODE(np);
588 if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD)
589 && VTONFS(vp)->n_size > 0) {
590 struct iovec aiov;
591 struct uio auio;
592 char buf[1];
593
594 NFSUNLOCKNODE(np);
595 aiov.iov_base = buf;
596 aiov.iov_len = 1;
597 auio.uio_iov = &aiov;
598 auio.uio_iovcnt = 1;
599 auio.uio_offset = 0;
600 auio.uio_resid = 1;
601 auio.uio_segflg = UIO_SYSSPACE;
602 auio.uio_rw = UIO_READ;
603 auio.uio_td = ap->a_td;
604
605 if (vp->v_type == VREG)
606 error = ncl_readrpc(vp, &auio, ap->a_cred);
607 else if (vp->v_type == VDIR) {
608 char* bp;
609 bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK);
610 aiov.iov_base = bp;
611 aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ;
612 error = ncl_readdirrpc(vp, &auio, ap->a_cred,
613 ap->a_td);
614 free(bp, M_TEMP);
615 } else if (vp->v_type == VLNK)
616 error = ncl_readlinkrpc(vp, &auio, ap->a_cred);
617 else
618 error = EACCES;
619 } else
620 NFSUNLOCKNODE(np);
621 return (error);
622 }
623 }
624
625 /*
626 * nfs open vnode op
627 * Check to see if the type is ok
628 * and that deletion is not in progress.
629 * For paged in text files, you will need to flush the page cache
630 * if consistency is lost.
631 */
632 /* ARGSUSED */
633 static int
nfs_open(struct vop_open_args * ap)634 nfs_open(struct vop_open_args *ap)
635 {
636 struct vnode *vp = ap->a_vp;
637 struct nfsnode *np = VTONFS(vp);
638 struct vattr vattr;
639 int error;
640 int fmode = ap->a_mode;
641 struct ucred *cred;
642 vm_object_t obj;
643
644 if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK)
645 return (EOPNOTSUPP);
646
647 /*
648 * For NFSv4, we need to do the Open Op before cache validation,
649 * so that we conform to RFC3530 Sec. 9.3.1.
650 */
651 if (NFS_ISV4(vp)) {
652 error = nfsrpc_open(vp, fmode, ap->a_cred, ap->a_td);
653 if (error) {
654 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
655 (gid_t)0);
656 return (error);
657 }
658 }
659
660 /*
661 * Now, if this Open will be doing reading, re-validate/flush the
662 * cache, so that Close/Open coherency is maintained.
663 */
664 NFSLOCKNODE(np);
665 if (np->n_flag & NMODIFIED) {
666 NFSUNLOCKNODE(np);
667 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
668 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
669 if (VN_IS_DOOMED(vp))
670 return (EBADF);
671 }
672 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
673 if (error == EINTR || error == EIO) {
674 if (NFS_ISV4(vp))
675 (void) nfsrpc_close(vp, 0, ap->a_td);
676 return (error);
677 }
678 NFSLOCKNODE(np);
679 np->n_attrstamp = 0;
680 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
681 if (vp->v_type == VDIR)
682 np->n_direofoffset = 0;
683 NFSUNLOCKNODE(np);
684 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
685 if (error) {
686 if (NFS_ISV4(vp))
687 (void) nfsrpc_close(vp, 0, ap->a_td);
688 return (error);
689 }
690 NFSLOCKNODE(np);
691 np->n_mtime = vattr.va_mtime;
692 if (NFS_ISV4(vp))
693 np->n_change = vattr.va_filerev;
694 } else {
695 NFSUNLOCKNODE(np);
696 error = VOP_GETATTR(vp, &vattr, ap->a_cred);
697 if (error) {
698 if (NFS_ISV4(vp))
699 (void) nfsrpc_close(vp, 0, ap->a_td);
700 return (error);
701 }
702 NFSLOCKNODE(np);
703 if ((NFS_ISV4(vp) && np->n_change != vattr.va_filerev) ||
704 NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
705 if (vp->v_type == VDIR)
706 np->n_direofoffset = 0;
707 NFSUNLOCKNODE(np);
708 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
709 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
710 if (VN_IS_DOOMED(vp))
711 return (EBADF);
712 }
713 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
714 if (error == EINTR || error == EIO) {
715 if (NFS_ISV4(vp))
716 (void) nfsrpc_close(vp, 0, ap->a_td);
717 return (error);
718 }
719 NFSLOCKNODE(np);
720 np->n_mtime = vattr.va_mtime;
721 if (NFS_ISV4(vp))
722 np->n_change = vattr.va_filerev;
723 }
724 }
725
726 /*
727 * If the object has >= 1 O_DIRECT active opens, we disable caching.
728 */
729 if (newnfs_directio_enable && (fmode & O_DIRECT) &&
730 (vp->v_type == VREG)) {
731 if (np->n_directio_opens == 0) {
732 NFSUNLOCKNODE(np);
733 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
734 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
735 if (VN_IS_DOOMED(vp))
736 return (EBADF);
737 }
738 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
739 if (error) {
740 if (NFS_ISV4(vp))
741 (void) nfsrpc_close(vp, 0, ap->a_td);
742 return (error);
743 }
744 NFSLOCKNODE(np);
745 np->n_flag |= NNONCACHE;
746 }
747 np->n_directio_opens++;
748 }
749
750 /* If opened for writing via NFSv4.1 or later, mark that for pNFS. */
751 if (NFSHASPNFS(VFSTONFS(vp->v_mount)) && (fmode & FWRITE) != 0)
752 np->n_flag |= NWRITEOPENED;
753
754 /*
755 * If this is an open for writing, capture a reference to the
756 * credentials, so they can be used by ncl_putpages(). Using
757 * these write credentials is preferable to the credentials of
758 * whatever thread happens to be doing the VOP_PUTPAGES() since
759 * the write RPCs are less likely to fail with EACCES.
760 */
761 if ((fmode & FWRITE) != 0) {
762 cred = np->n_writecred;
763 np->n_writecred = crhold(ap->a_cred);
764 } else
765 cred = NULL;
766 NFSUNLOCKNODE(np);
767
768 if (cred != NULL)
769 crfree(cred);
770 vnode_create_vobject(vp, vattr.va_size, ap->a_td);
771
772 /*
773 * If the text file has been mmap'd, flush any dirty pages to the
774 * buffer cache and then...
775 * Make sure all writes are pushed to the NFS server. If this is not
776 * done, the modify time of the file can change while the text
777 * file is being executed. This will cause the process that is
778 * executing the text file to be terminated.
779 */
780 if (vp->v_writecount <= -1) {
781 if ((obj = vp->v_object) != NULL &&
782 vm_object_mightbedirty(obj)) {
783 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
784 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
785 if (VN_IS_DOOMED(vp))
786 return (EBADF);
787 }
788 vnode_pager_clean_sync(vp);
789 }
790
791 /* Now, flush the buffer cache. */
792 ncl_flush(vp, MNT_WAIT, curthread, 0, 0);
793
794 /* And, finally, make sure that n_mtime is up to date. */
795 np = VTONFS(vp);
796 NFSLOCKNODE(np);
797 np->n_mtime = np->n_vattr.na_mtime;
798 NFSUNLOCKNODE(np);
799 }
800 return (0);
801 }
802
803 /*
804 * nfs close vnode op
805 * What an NFS client should do upon close after writing is a debatable issue.
806 * Most NFS clients push delayed writes to the server upon close, basically for
807 * two reasons:
808 * 1 - So that any write errors may be reported back to the client process
809 * doing the close system call. By far the two most likely errors are
810 * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure.
811 * 2 - To put a worst case upper bound on cache inconsistency between
812 * multiple clients for the file.
813 * There is also a consistency problem for Version 2 of the protocol w.r.t.
814 * not being able to tell if other clients are writing a file concurrently,
815 * since there is no way of knowing if the changed modify time in the reply
816 * is only due to the write for this client.
817 * (NFS Version 3 provides weak cache consistency data in the reply that
818 * should be sufficient to detect and handle this case.)
819 *
820 * The current code does the following:
821 * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers
822 * for NFS Version 3 - flush dirty buffers to the server but don't invalidate
823 * or commit them (this satisfies 1 and 2 except for the
824 * case where the server crashes after this close but
825 * before the commit RPC, which is felt to be "good
826 * enough". Changing the last argument to ncl_flush() to
827 * a 1 would force a commit operation, if it is felt a
828 * commit is necessary now.
829 * for NFS Version 4 - flush the dirty buffers and commit them, if
830 * nfscl_mustflush() says this is necessary.
831 * It is necessary if there is no write delegation held,
832 * in order to satisfy open/close coherency.
833 * If the file isn't cached on local stable storage,
834 * it may be necessary in order to detect "out of space"
835 * errors from the server, if the write delegation
836 * issued by the server doesn't allow the file to grow.
837 */
838 /* ARGSUSED */
839 static int
nfs_close(struct vop_close_args * ap)840 nfs_close(struct vop_close_args *ap)
841 {
842 struct vnode *vp = ap->a_vp;
843 struct nfsnode *np = VTONFS(vp);
844 struct nfsvattr nfsva;
845 struct ucred *cred;
846 int error = 0, ret, localcred = 0;
847 int fmode = ap->a_fflag;
848 struct nfsmount *nmp;
849
850 if (NFSCL_FORCEDISM(vp->v_mount))
851 return (0);
852 nmp = VFSTONFS(vp->v_mount);
853 /*
854 * During shutdown, a_cred isn't valid, so just use root.
855 */
856 if (ap->a_cred == NOCRED) {
857 cred = newnfs_getcred();
858 localcred = 1;
859 } else {
860 cred = ap->a_cred;
861 }
862 if (vp->v_type == VREG) {
863 /*
864 * Examine and clean dirty pages, regardless of NMODIFIED.
865 * This closes a major hole in close-to-open consistency.
866 * We want to push out all dirty pages (and buffers) on
867 * close, regardless of whether they were dirtied by
868 * mmap'ed writes or via write().
869 */
870 if (nfs_clean_pages_on_close && vp->v_object) {
871 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
872 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
873 if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK)
874 return (EBADF);
875 }
876 vnode_pager_clean_async(vp);
877 }
878 NFSLOCKNODE(np);
879 if (np->n_flag & NMODIFIED) {
880 NFSUNLOCKNODE(np);
881 if (NFS_ISV3(vp)) {
882 /*
883 * Under NFSv3 we have dirty buffers to dispose of. We
884 * must flush them to the NFS server. We have the option
885 * of waiting all the way through the commit rpc or just
886 * waiting for the initial write. The default is to only
887 * wait through the initial write so the data is in the
888 * server's cache, which is roughly similar to the state
889 * a standard disk subsystem leaves the file in on close().
890 *
891 * We cannot clear the NMODIFIED bit in np->n_flag due to
892 * potential races with other processes, and certainly
893 * cannot clear it if we don't commit.
894 * These races occur when there is no longer the old
895 * traditional vnode locking implemented for Vnode Ops.
896 */
897 int cm = newnfs_commit_on_close ? 1 : 0;
898 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
899 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
900 if (VN_IS_DOOMED(vp) && ap->a_fflag != FNONBLOCK)
901 return (EBADF);
902 }
903 error = ncl_flush(vp, MNT_WAIT, ap->a_td, cm, 0);
904 /* np->n_flag &= ~NMODIFIED; */
905 } else if (NFS_ISV4(vp)) {
906 if (!NFSHASNFSV4N(nmp) ||
907 (nmp->nm_flag & NFSMNT_NOCTO) == 0 ||
908 nfscl_mustflush(vp) != 0) {
909 int cm = newnfs_commit_on_close ? 1 : 0;
910 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
911 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
912 if (VN_IS_DOOMED(vp) && ap->a_fflag !=
913 FNONBLOCK)
914 return (EBADF);
915 }
916 error = ncl_flush(vp, MNT_WAIT, ap->a_td,
917 cm, 0);
918 /*
919 * as above w.r.t races when clearing
920 * NMODIFIED.
921 * np->n_flag &= ~NMODIFIED;
922 */
923 }
924 } else {
925 if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
926 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
927 if (VN_IS_DOOMED(vp) && ap->a_fflag !=
928 FNONBLOCK)
929 return (EBADF);
930 }
931 error = ncl_vinvalbuf(vp, V_SAVE, ap->a_td, 1);
932 }
933 NFSLOCKNODE(np);
934 }
935 /*
936 * Invalidate the attribute cache in all cases.
937 * An open is going to fetch fresh attrs any way, other procs
938 * on this node that have file open will be forced to do an
939 * otw attr fetch, but this is safe.
940 * --> A user found that their RPC count dropped by 20% when
941 * this was commented out and I can't see any requirement
942 * for it, so I've disabled it when negative lookups are
943 * enabled. (What does this have to do with negative lookup
944 * caching? Well nothing, except it was reported by the
945 * same user that needed negative lookup caching and I wanted
946 * there to be a way to disable it to see if it
947 * is the cause of some caching/coherency issue that might
948 * crop up.)
949 */
950 if (nmp->nm_negnametimeo == 0) {
951 np->n_attrstamp = 0;
952 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
953 }
954 if (np->n_flag & NWRITEERR) {
955 np->n_flag &= ~NWRITEERR;
956 error = np->n_error;
957 }
958 NFSUNLOCKNODE(np);
959 }
960
961 if (NFS_ISV4(vp)) {
962 /*
963 * Get attributes so "change" is up to date.
964 */
965 if (error == 0 && nfscl_nodeleg(vp, 0) != 0 &&
966 vp->v_type == VREG &&
967 (nmp->nm_flag & NFSMNT_NOCTO) == 0) {
968 ret = nfsrpc_getattr(vp, cred, ap->a_td, &nfsva);
969 if (!ret) {
970 np->n_change = nfsva.na_filerev;
971 (void) nfscl_loadattrcache(&vp, &nfsva, NULL,
972 0, 0);
973 }
974 }
975
976 /*
977 * and do the close.
978 */
979 ret = nfsrpc_close(vp, 0, ap->a_td);
980 if (!error && ret)
981 error = ret;
982 if (error)
983 error = nfscl_maperr(ap->a_td, error, (uid_t)0,
984 (gid_t)0);
985 }
986 if (newnfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) {
987 NFSLOCKNODE(np);
988 KASSERT((np->n_directio_opens > 0),
989 ("nfs_close: unexpectedly value (0) of n_directio_opens\n"));
990 np->n_directio_opens--;
991 if (np->n_directio_opens == 0)
992 np->n_flag &= ~NNONCACHE;
993 NFSUNLOCKNODE(np);
994 }
995 if (localcred)
996 NFSFREECRED(cred);
997 return (error);
998 }
999
1000 /*
1001 * nfs getattr call from vfs.
1002 */
1003 static int
nfs_getattr(struct vop_getattr_args * ap)1004 nfs_getattr(struct vop_getattr_args *ap)
1005 {
1006 struct vnode *vp = ap->a_vp;
1007 struct thread *td = curthread; /* XXX */
1008 struct nfsnode *np = VTONFS(vp);
1009 int error = 0;
1010 struct nfsvattr nfsva;
1011 struct vattr *vap = ap->a_vap;
1012 struct vattr vattr;
1013 struct nfsmount *nmp;
1014
1015 nmp = VFSTONFS(vp->v_mount);
1016 /*
1017 * Update local times for special files.
1018 */
1019 NFSLOCKNODE(np);
1020 if (np->n_flag & (NACC | NUPD))
1021 np->n_flag |= NCHG;
1022 NFSUNLOCKNODE(np);
1023 /*
1024 * First look in the cache.
1025 * For "syskrb5" mounts, nm_fhsize might still be zero and
1026 * cached attributes should be ignored.
1027 */
1028 if (nmp->nm_fhsize > 0 && ncl_getattrcache(vp, &vattr) == 0) {
1029 ncl_copy_vattr(vap, &vattr);
1030
1031 /*
1032 * Get the local modify time for the case of a write
1033 * delegation.
1034 */
1035 nfscl_deleggetmodtime(vp, &vap->va_mtime);
1036 return (0);
1037 }
1038
1039 if (NFS_ISV34(vp) && nfs_prime_access_cache &&
1040 nfsaccess_cache_timeout > 0) {
1041 NFSINCRGLOBAL(nfsstatsv1.accesscache_misses);
1042 nfs34_access_otw(vp, NFSACCESS_ALL, td, ap->a_cred, NULL);
1043 if (ncl_getattrcache(vp, ap->a_vap) == 0) {
1044 nfscl_deleggetmodtime(vp, &ap->a_vap->va_mtime);
1045 return (0);
1046 }
1047 }
1048
1049 error = nfsrpc_getattr(vp, ap->a_cred, td, &nfsva);
1050 if (error == 0)
1051 error = nfscl_loadattrcache(&vp, &nfsva, vap, 0, 0);
1052 if (!error) {
1053 /*
1054 * Get the local modify time for the case of a write
1055 * delegation.
1056 */
1057 nfscl_deleggetmodtime(vp, &vap->va_mtime);
1058 } else if (NFS_ISV4(vp)) {
1059 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
1060 }
1061 return (error);
1062 }
1063
1064 /*
1065 * nfs setattr call.
1066 */
1067 static int
nfs_setattr(struct vop_setattr_args * ap)1068 nfs_setattr(struct vop_setattr_args *ap)
1069 {
1070 struct vnode *vp = ap->a_vp;
1071 struct nfsnode *np = VTONFS(vp);
1072 struct thread *td = curthread; /* XXX */
1073 struct vattr *vap = ap->a_vap;
1074 int error = 0;
1075 u_quad_t tsize;
1076 struct timespec ts;
1077 struct nfsmount *nmp;
1078
1079 #ifndef nolint
1080 tsize = (u_quad_t)0;
1081 #endif
1082
1083 /*
1084 * Only setting of UF_HIDDEN and UF_SYSTEM are supported and
1085 * only for NFSv4 servers that support them.
1086 */
1087 nmp = VFSTONFS(vp->v_mount);
1088 if (vap->va_flags != VNOVAL && (!NFSHASNFSV4(nmp) ||
1089 (vap->va_flags & ~(UF_HIDDEN | UF_SYSTEM)) != 0 ||
1090 ((vap->va_flags & UF_HIDDEN) != 0 &&
1091 !NFSISSET_ATTRBIT(&np->n_vattr.na_suppattr, NFSATTRBIT_HIDDEN)) ||
1092 ((vap->va_flags & UF_SYSTEM) != 0 &&
1093 !NFSISSET_ATTRBIT(&np->n_vattr.na_suppattr, NFSATTRBIT_SYSTEM))))
1094 return (EOPNOTSUPP);
1095
1096 /*
1097 * Disallow write attempts if the filesystem is mounted read-only.
1098 */
1099 if ((vap->va_flags != (u_long)VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
1100 vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
1101 vap->va_mtime.tv_sec != VNOVAL ||
1102 vap->va_birthtime.tv_sec != VNOVAL ||
1103 vap->va_mode != (mode_t)VNOVAL) &&
1104 (vp->v_mount->mnt_flag & MNT_RDONLY))
1105 return (EROFS);
1106 if (vap->va_size != VNOVAL) {
1107 switch (vp->v_type) {
1108 case VDIR:
1109 return (EISDIR);
1110 case VCHR:
1111 case VBLK:
1112 case VSOCK:
1113 case VFIFO:
1114 if (vap->va_mtime.tv_sec == VNOVAL &&
1115 vap->va_atime.tv_sec == VNOVAL &&
1116 vap->va_birthtime.tv_sec == VNOVAL &&
1117 vap->va_mode == (mode_t)VNOVAL &&
1118 vap->va_uid == (uid_t)VNOVAL &&
1119 vap->va_gid == (gid_t)VNOVAL)
1120 return (0);
1121 vap->va_size = VNOVAL;
1122 break;
1123 default:
1124 /*
1125 * Disallow write attempts if the filesystem is
1126 * mounted read-only.
1127 */
1128 if (vp->v_mount->mnt_flag & MNT_RDONLY)
1129 return (EROFS);
1130 /*
1131 * We run vnode_pager_setsize() early (why?),
1132 * we must set np->n_size now to avoid vinvalbuf
1133 * V_SAVE races that might setsize a lower
1134 * value.
1135 */
1136 NFSLOCKNODE(np);
1137 tsize = np->n_size;
1138 NFSUNLOCKNODE(np);
1139 error = ncl_meta_setsize(vp, td, vap->va_size);
1140 NFSLOCKNODE(np);
1141 if (np->n_flag & NMODIFIED) {
1142 tsize = np->n_size;
1143 NFSUNLOCKNODE(np);
1144 error = ncl_vinvalbuf(vp, vap->va_size == 0 ?
1145 0 : V_SAVE, td, 1);
1146 if (error != 0) {
1147 vnode_pager_setsize(vp, tsize);
1148 return (error);
1149 }
1150 /*
1151 * Call nfscl_delegmodtime() to set the modify time
1152 * locally, as required.
1153 */
1154 nfscl_delegmodtime(vp, NULL);
1155 } else
1156 NFSUNLOCKNODE(np);
1157 /*
1158 * np->n_size has already been set to vap->va_size
1159 * in ncl_meta_setsize(). We must set it again since
1160 * nfs_loadattrcache() could be called through
1161 * ncl_meta_setsize() and could modify np->n_size.
1162 */
1163 NFSLOCKNODE(np);
1164 np->n_vattr.na_size = np->n_size = vap->va_size;
1165 NFSUNLOCKNODE(np);
1166 }
1167 } else {
1168 NFSLOCKNODE(np);
1169 if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) &&
1170 (np->n_flag & NMODIFIED) && vp->v_type == VREG) {
1171 NFSUNLOCKNODE(np);
1172 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
1173 if (error == EINTR || error == EIO)
1174 return (error);
1175 } else
1176 NFSUNLOCKNODE(np);
1177 }
1178 error = nfs_setattrrpc(vp, vap, ap->a_cred, td);
1179 if (vap->va_size != VNOVAL) {
1180 if (error == 0) {
1181 nanouptime(&ts);
1182 NFSLOCKNODE(np);
1183 np->n_localmodtime = ts;
1184 NFSUNLOCKNODE(np);
1185 } else {
1186 NFSLOCKNODE(np);
1187 np->n_size = np->n_vattr.na_size = tsize;
1188 vnode_pager_setsize(vp, tsize);
1189 NFSUNLOCKNODE(np);
1190 }
1191 }
1192 if (vap->va_mtime.tv_sec != VNOVAL && error == 0)
1193 nfscl_delegmodtime(vp, &vap->va_mtime);
1194 return (error);
1195 }
1196
1197 /*
1198 * Do an nfs setattr rpc.
1199 */
1200 static int
nfs_setattrrpc(struct vnode * vp,struct vattr * vap,struct ucred * cred,struct thread * td)1201 nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred,
1202 struct thread *td)
1203 {
1204 struct nfsnode *np = VTONFS(vp);
1205 int error, ret, attrflag, i;
1206 struct nfsvattr nfsva;
1207
1208 if (NFS_ISV34(vp)) {
1209 NFSLOCKNODE(np);
1210 for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
1211 np->n_accesscache[i].stamp = 0;
1212 np->n_flag |= NDELEGMOD;
1213 NFSUNLOCKNODE(np);
1214 KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp);
1215 }
1216 error = nfsrpc_setattr(vp, vap, NULL, cred, td, &nfsva, &attrflag);
1217 if (attrflag) {
1218 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
1219 if (ret && !error)
1220 error = ret;
1221 }
1222 if (error && NFS_ISV4(vp))
1223 error = nfscl_maperr(td, error, vap->va_uid, vap->va_gid);
1224 return (error);
1225 }
1226
1227 /*
1228 * Get a named attribute directory for the vnode.
1229 */
1230 static int
nfs_get_namedattrdir(struct vnode * vp,struct componentname * cnp,struct vnode ** vpp)1231 nfs_get_namedattrdir(struct vnode *vp, struct componentname *cnp,
1232 struct vnode **vpp)
1233 {
1234 struct nfsfh *nfhp;
1235 struct nfsnode *np;
1236 struct vnode *newvp;
1237 struct nfsvattr nfsva;
1238 int attrflag, error;
1239
1240 attrflag = 0;
1241 *vpp = NULL;
1242 np = VTONFS(vp);
1243 error = nfsrpc_openattr(VFSTONFS(vp->v_mount), vp, np->n_fhp->nfh_fh,
1244 np->n_fhp->nfh_len, (cnp->cn_flags & CREATENAMED),
1245 cnp->cn_cred, curthread, &nfsva, &nfhp, &attrflag);
1246 if (error == NFSERR_NOTSUPP)
1247 error = ENOATTR;
1248 if (error == 0)
1249 error = nfscl_nget(vp->v_mount, vp, nfhp, cnp, curthread, &np,
1250 cnp->cn_lkflags);
1251 if (error != 0)
1252 return (error);
1253 newvp = NFSTOV(np);
1254 vn_irflag_set_cond(newvp, VIRF_NAMEDDIR);
1255 if (attrflag != 0)
1256 (void)nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
1257 *vpp = newvp;
1258 return (0);
1259 }
1260
1261 /*
1262 * nfs lookup call, one step at a time...
1263 * First look in cache
1264 * If not found, unlock the directory nfsnode and do the rpc
1265 */
1266 static int
nfs_lookup(struct vop_lookup_args * ap)1267 nfs_lookup(struct vop_lookup_args *ap)
1268 {
1269 struct componentname *cnp = ap->a_cnp;
1270 struct vnode *dvp = ap->a_dvp;
1271 struct vnode **vpp = ap->a_vpp;
1272 struct mount *mp = dvp->v_mount;
1273 uint64_t flags = cnp->cn_flags;
1274 struct vnode *newvp;
1275 struct nfsmount *nmp;
1276 struct nfsnode *np, *newnp;
1277 int error = 0, attrflag, dattrflag, ltype, ncticks;
1278 struct thread *td = curthread;
1279 struct nfsfh *nfhp;
1280 struct nfsvattr dnfsva, nfsva;
1281 struct vattr vattr;
1282 struct timespec nctime, ts;
1283 uint32_t openmode;
1284 bool is_nameddir, needs_nameddir, opennamed;
1285
1286 dattrflag = 0;
1287 *vpp = NULLVP;
1288 nmp = VFSTONFS(mp);
1289 opennamed = (flags & (OPENNAMED | ISLASTCN)) == (OPENNAMED | ISLASTCN);
1290 if (opennamed && (!NFSHASNFSV4(nmp) || !NFSHASNFSV4N(nmp)))
1291 return (ENOATTR);
1292 is_nameddir = (vn_irflag_read(dvp) & VIRF_NAMEDDIR) != 0;
1293 if ((is_nameddir && (flags & ISLASTCN) == 0 && (cnp->cn_namelen > 1 ||
1294 *cnp->cn_nameptr != '.')) ||
1295 (opennamed && !is_nameddir && (flags & ISDOTDOT) != 0))
1296 return (ENOATTR);
1297 if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) &&
1298 (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
1299 return (EROFS);
1300 np = VTONFS(dvp);
1301
1302 needs_nameddir = false;
1303 if (opennamed || is_nameddir) {
1304 cnp->cn_flags &= ~MAKEENTRY;
1305 if (!is_nameddir)
1306 needs_nameddir = true;
1307 }
1308
1309 /*
1310 * If the named attribute directory is needed, acquire it now.
1311 */
1312 newvp = NULLVP;
1313 if (needs_nameddir) {
1314 KASSERT(np->n_v4 == NULL, ("nfs_lookup: O_NAMEDATTR when"
1315 " n_v4 not NULL"));
1316 error = nfs_get_namedattrdir(dvp, cnp, &newvp);
1317 if (error != 0)
1318 goto handle_error;
1319 if (cnp->cn_namelen == 1 && *cnp->cn_nameptr == '.') {
1320 *vpp = newvp;
1321 return (0);
1322 }
1323 dvp = newvp;
1324 np = VTONFS(dvp);
1325 newvp = NULLVP;
1326 } else if (opennamed && cnp->cn_namelen == 1 &&
1327 *cnp->cn_nameptr == '.') {
1328 VREF(dvp);
1329 *vpp = dvp;
1330 return (0);
1331 }
1332
1333 if (dvp->v_type != VDIR)
1334 return (ENOTDIR);
1335
1336 /* For NFSv4, wait until any remove is done. */
1337 NFSLOCKNODE(np);
1338 while (NFSHASNFSV4(nmp) && (np->n_flag & NREMOVEINPROG)) {
1339 np->n_flag |= NREMOVEWANT;
1340 (void) msleep((caddr_t)np, &np->n_mtx, PZERO, "nfslkup", 0);
1341 }
1342 NFSUNLOCKNODE(np);
1343
1344 error = vn_dir_check_exec(dvp, cnp);
1345 if (error != 0)
1346 return (error);
1347
1348 if (!opennamed && !is_nameddir) {
1349 error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks);
1350 if (error > 0 && error != ENOENT)
1351 return (error);
1352 if (error == -1) {
1353 /*
1354 * Lookups of "." are special and always return the
1355 * current directory. cache_lookup() already handles
1356 * associated locking bookkeeping, etc.
1357 */
1358 if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
1359 return (0);
1360 }
1361
1362 /*
1363 * We only accept a positive hit in the cache if the
1364 * change time of the file matches our cached copy.
1365 * Otherwise, we discard the cache entry and fallback
1366 * to doing a lookup RPC. We also only trust cache
1367 * entries for less than nm_nametimeo seconds.
1368 *
1369 * To better handle stale file handles and attributes,
1370 * clear the attribute cache of this node if it is a
1371 * leaf component, part of an open() call, and not
1372 * locally modified before fetching the attributes.
1373 * This should allow stale file handles to be detected
1374 * here where we can fall back to a LOOKUP RPC to
1375 * recover rather than having nfs_open() detect the
1376 * stale file handle and failing open(2) with ESTALE.
1377 */
1378 newvp = *vpp;
1379 newnp = VTONFS(newvp);
1380 if (!(nmp->nm_flag & NFSMNT_NOCTO) &&
1381 (flags & (ISLASTCN | ISOPEN)) ==
1382 (ISLASTCN | ISOPEN) &&
1383 !(newnp->n_flag & NMODIFIED)) {
1384 NFSLOCKNODE(newnp);
1385 newnp->n_attrstamp = 0;
1386 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1387 NFSUNLOCKNODE(newnp);
1388 }
1389 if (nfscl_nodeleg(newvp, 0) == 0 ||
1390 ((u_int)(ticks - ncticks) <
1391 (nmp->nm_nametimeo * hz) &&
1392 VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 &&
1393 timespeccmp(&vattr.va_ctime, &nctime, ==))) {
1394 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits);
1395 return (0);
1396 }
1397 cache_purge(newvp);
1398 if (dvp != newvp)
1399 vput(newvp);
1400 else
1401 vrele(newvp);
1402 *vpp = NULLVP;
1403 } else if (error == ENOENT) {
1404 if (VN_IS_DOOMED(dvp))
1405 return (ENOENT);
1406 /*
1407 * We only accept a negative hit in the cache if the
1408 * modification time of the parent directory matches
1409 * the cached copy in the name cache entry.
1410 * Otherwise, we discard all of the negative cache
1411 * entries for this directory. We also only trust
1412 * negative cache entries for up to nm_negnametimeo
1413 * seconds.
1414 */
1415 if ((u_int)(ticks - ncticks) <
1416 (nmp->nm_negnametimeo * hz) &&
1417 VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 &&
1418 timespeccmp(&vattr.va_mtime, &nctime, ==)) {
1419 NFSINCRGLOBAL(nfsstatsv1.lookupcache_hits);
1420 return (ENOENT);
1421 }
1422 cache_purge_negative(dvp);
1423 }
1424 }
1425
1426 openmode = 0;
1427 #if 0
1428 /*
1429 * The use of LookupOpen breaks some builds. It is disabled
1430 * until that is fixed.
1431 */
1432 /*
1433 * If this an NFSv4.1/4.2 mount using the "oneopenown" mount
1434 * option, it is possible to do the Open operation in the same
1435 * compound as Lookup, so long as delegations are not being
1436 * issued. This saves doing a separate RPC for Open.
1437 * For pnfs, do not do this, since the Open+LayoutGet will
1438 * be needed as a separate RPC.
1439 */
1440 NFSLOCKMNT(nmp);
1441 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp) && !NFSHASPNFS(nmp) &&
1442 (nmp->nm_privflag & NFSMNTP_DELEGISSUED) == 0 &&
1443 (!NFSMNT_RDONLY(mp) || (flags & OPENWRITE) == 0) &&
1444 (flags & (ISLASTCN | ISOPEN | OPENNAMED))) == (ISLASTCN | ISOPEN)) {
1445 if ((flags & OPENREAD) != 0)
1446 openmode |= NFSV4OPEN_ACCESSREAD;
1447 if ((flags & OPENWRITE) != 0)
1448 openmode |= NFSV4OPEN_ACCESSWRITE;
1449 }
1450 NFSUNLOCKMNT(nmp);
1451 #endif
1452
1453 newvp = NULLVP;
1454 NFSINCRGLOBAL(nfsstatsv1.lookupcache_misses);
1455 nanouptime(&ts);
1456 error = nfsrpc_lookup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1457 cnp->cn_cred, td, &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag,
1458 openmode);
1459 if (dattrflag)
1460 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
1461 if (needs_nameddir) {
1462 vput(dvp);
1463 dvp = ap->a_dvp;
1464 }
1465 handle_error:
1466 if (error) {
1467 if (newvp != NULLVP) {
1468 vput(newvp);
1469 *vpp = NULLVP;
1470 }
1471
1472 if (error != ENOENT) {
1473 if (NFS_ISV4(dvp))
1474 error = nfscl_maperr(td, error,
1475 (uid_t)0, (gid_t)0);
1476 return (error);
1477 }
1478
1479 /* The requested file was not found. */
1480 if ((cnp->cn_nameiop == CREATE ||
1481 cnp->cn_nameiop == RENAME) &&
1482 (flags & ISLASTCN)) {
1483 /*
1484 * XXX: UFS does a full VOP_ACCESS(dvp,
1485 * VWRITE) here instead of just checking
1486 * MNT_RDONLY.
1487 */
1488 if (mp->mnt_flag & MNT_RDONLY)
1489 return (EROFS);
1490 return (EJUSTRETURN);
1491 }
1492
1493 if ((cnp->cn_flags & MAKEENTRY) != 0 && dattrflag) {
1494 /*
1495 * Cache the modification time of the parent
1496 * directory from the post-op attributes in
1497 * the name cache entry. The negative cache
1498 * entry will be ignored once the directory
1499 * has changed. Don't bother adding the entry
1500 * if the directory has already changed.
1501 */
1502 NFSLOCKNODE(np);
1503 if (timespeccmp(&np->n_vattr.na_mtime,
1504 &dnfsva.na_mtime, ==)) {
1505 NFSUNLOCKNODE(np);
1506 cache_enter_time(dvp, NULL, cnp,
1507 &dnfsva.na_mtime, NULL);
1508 } else
1509 NFSUNLOCKNODE(np);
1510 }
1511 return (ENOENT);
1512 }
1513
1514 /*
1515 * Handle RENAME case...
1516 */
1517 if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) {
1518 if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1519 free(nfhp, M_NFSFH);
1520 return (EISDIR);
1521 }
1522 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np,
1523 LK_EXCLUSIVE);
1524 if (error)
1525 return (error);
1526 newvp = NFSTOV(np);
1527 /*
1528 * If n_localmodtime >= time before RPC, then
1529 * a file modification operation, such as
1530 * VOP_SETATTR() of size, has occurred while
1531 * the Lookup RPC and acquisition of the vnode
1532 * happened. As such, the attributes might
1533 * be stale, with possibly an incorrect size.
1534 */
1535 NFSLOCKNODE(np);
1536 if (timespecisset(&np->n_localmodtime) &&
1537 timespeccmp(&np->n_localmodtime, &ts, >=)) {
1538 NFSCL_DEBUG(4, "nfs_lookup: rename localmod "
1539 "stale attributes\n");
1540 attrflag = 0;
1541 }
1542 NFSUNLOCKNODE(np);
1543 if (attrflag)
1544 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
1545 0, 1);
1546 *vpp = newvp;
1547 return (0);
1548 }
1549
1550 if (flags & ISDOTDOT) {
1551 ltype = NFSVOPISLOCKED(dvp);
1552 error = vfs_busy(mp, MBF_NOWAIT);
1553 if (error != 0) {
1554 vfs_ref(mp);
1555 NFSVOPUNLOCK(dvp);
1556 error = vfs_busy(mp, 0);
1557 NFSVOPLOCK(dvp, ltype | LK_RETRY);
1558 vfs_rel(mp);
1559 if (error == 0 && VN_IS_DOOMED(dvp)) {
1560 vfs_unbusy(mp);
1561 error = ENOENT;
1562 }
1563 if (error != 0)
1564 return (error);
1565 }
1566 NFSVOPUNLOCK(dvp);
1567 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np,
1568 cnp->cn_lkflags);
1569 if (error == 0)
1570 newvp = NFSTOV(np);
1571 vfs_unbusy(mp);
1572 if (newvp != dvp)
1573 NFSVOPLOCK(dvp, ltype | LK_RETRY);
1574 if (VN_IS_DOOMED(dvp)) {
1575 if (error == 0) {
1576 if (newvp == dvp)
1577 vrele(newvp);
1578 else
1579 vput(newvp);
1580 }
1581 error = ENOENT;
1582 }
1583 if (error != 0)
1584 return (error);
1585 if (attrflag)
1586 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
1587 0, 1);
1588 } else if (NFS_CMPFH(np, nfhp->nfh_fh, nfhp->nfh_len)) {
1589 free(nfhp, M_NFSFH);
1590 VREF(dvp);
1591 newvp = dvp;
1592 if (attrflag)
1593 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
1594 0, 1);
1595 } else {
1596 error = nfscl_nget(mp, dvp, nfhp, cnp, td, &np,
1597 cnp->cn_lkflags);
1598 if (error)
1599 return (error);
1600 newvp = NFSTOV(np);
1601 if (opennamed)
1602 vn_irflag_set_cond(newvp, VIRF_NAMEDATTR);
1603 /*
1604 * If n_localmodtime >= time before RPC, then
1605 * a file modification operation, such as
1606 * VOP_SETATTR() of size, has occurred while
1607 * the Lookup RPC and acquisition of the vnode
1608 * happened. As such, the attributes might
1609 * be stale, with possibly an incorrect size.
1610 */
1611 NFSLOCKNODE(np);
1612 if (timespecisset(&np->n_localmodtime) &&
1613 timespeccmp(&np->n_localmodtime, &ts, >=)) {
1614 NFSCL_DEBUG(4, "nfs_lookup: localmod "
1615 "stale attributes\n");
1616 attrflag = 0;
1617 }
1618 NFSUNLOCKNODE(np);
1619 if (attrflag)
1620 (void)nfscl_loadattrcache(&newvp, &nfsva, NULL,
1621 0, 1);
1622 else if ((flags & (ISLASTCN | ISOPEN)) ==
1623 (ISLASTCN | ISOPEN) &&
1624 !(np->n_flag & NMODIFIED)) {
1625 /*
1626 * Flush the attribute cache when opening a
1627 * leaf node to ensure that fresh attributes
1628 * are fetched in nfs_open() since we did not
1629 * fetch attributes from the LOOKUP reply.
1630 */
1631 NFSLOCKNODE(np);
1632 np->n_attrstamp = 0;
1633 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp);
1634 NFSUNLOCKNODE(np);
1635 }
1636 }
1637 if ((cnp->cn_flags & MAKEENTRY) && dvp != newvp &&
1638 (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) &&
1639 attrflag != 0 && (newvp->v_type != VDIR || dattrflag != 0))
1640 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
1641 newvp->v_type != VDIR ? NULL : &dnfsva.na_ctime);
1642 *vpp = newvp;
1643 return (0);
1644 }
1645
1646 /*
1647 * nfs read call.
1648 * Just call ncl_bioread() to do the work.
1649 */
1650 static int
nfs_read(struct vop_read_args * ap)1651 nfs_read(struct vop_read_args *ap)
1652 {
1653 struct vnode *vp = ap->a_vp;
1654
1655 switch (vp->v_type) {
1656 case VREG:
1657 return (ncl_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred));
1658 case VDIR:
1659 return (EISDIR);
1660 default:
1661 return (EOPNOTSUPP);
1662 }
1663 }
1664
1665 /*
1666 * nfs readlink call
1667 */
1668 static int
nfs_readlink(struct vop_readlink_args * ap)1669 nfs_readlink(struct vop_readlink_args *ap)
1670 {
1671 struct vnode *vp = ap->a_vp;
1672
1673 if (vp->v_type != VLNK)
1674 return (EINVAL);
1675 return (ncl_bioread(vp, ap->a_uio, 0, ap->a_cred));
1676 }
1677
1678 /*
1679 * Do a readlink rpc.
1680 * Called by ncl_doio() from below the buffer cache.
1681 */
1682 int
ncl_readlinkrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred)1683 ncl_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1684 {
1685 int error, ret, attrflag;
1686 struct nfsvattr nfsva;
1687
1688 error = nfsrpc_readlink(vp, uiop, cred, uiop->uio_td, &nfsva,
1689 &attrflag);
1690 if (attrflag) {
1691 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
1692 if (ret && !error)
1693 error = ret;
1694 }
1695 if (error && NFS_ISV4(vp))
1696 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1697 return (error);
1698 }
1699
1700 /*
1701 * nfs read rpc call
1702 * Ditto above
1703 */
1704 int
ncl_readrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred)1705 ncl_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred)
1706 {
1707 int error, ret, attrflag;
1708 struct nfsvattr nfsva;
1709 struct nfsmount *nmp;
1710
1711 nmp = VFSTONFS(vp->v_mount);
1712 error = EIO;
1713 attrflag = 0;
1714 if (NFSHASPNFS(nmp))
1715 error = nfscl_doiods(vp, uiop, NULL, NULL,
1716 NFSV4OPEN_ACCESSREAD, 0, cred, uiop->uio_td);
1717 NFSCL_DEBUG(4, "readrpc: aft doiods=%d\n", error);
1718 if (error != 0 && error != EFAULT)
1719 error = nfsrpc_read(vp, uiop, cred, uiop->uio_td, &nfsva,
1720 &attrflag);
1721 if (attrflag) {
1722 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
1723 if (ret && !error)
1724 error = ret;
1725 }
1726 if (error && NFS_ISV4(vp))
1727 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1728 return (error);
1729 }
1730
1731 /*
1732 * nfs write call
1733 */
1734 int
ncl_writerpc(struct vnode * vp,struct uio * uiop,struct ucred * cred,int * iomode,int * must_commit,int called_from_strategy,int ioflag)1735 ncl_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
1736 int *iomode, int *must_commit, int called_from_strategy, int ioflag)
1737 {
1738 struct nfsvattr nfsva;
1739 int error, attrflag, ret;
1740 struct nfsmount *nmp;
1741
1742 nmp = VFSTONFS(vp->v_mount);
1743 error = EIO;
1744 attrflag = 0;
1745 if (NFSHASPNFS(nmp))
1746 error = nfscl_doiods(vp, uiop, iomode, must_commit,
1747 NFSV4OPEN_ACCESSWRITE, 0, cred, uiop->uio_td);
1748 NFSCL_DEBUG(4, "writerpc: aft doiods=%d\n", error);
1749 if (error != 0 && error != EFAULT)
1750 error = nfsrpc_write(vp, uiop, iomode, must_commit, cred,
1751 uiop->uio_td, &nfsva, &attrflag, called_from_strategy,
1752 ioflag);
1753 if (attrflag) {
1754 if (VTONFS(vp)->n_flag & ND_NFSV4)
1755 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 1, 1);
1756 else
1757 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
1758 if (ret && !error)
1759 error = ret;
1760 }
1761 if (DOINGASYNC(vp))
1762 *iomode = NFSWRITE_FILESYNC;
1763 if (error && NFS_ISV4(vp))
1764 error = nfscl_maperr(uiop->uio_td, error, (uid_t)0, (gid_t)0);
1765 return (error);
1766 }
1767
1768 /*
1769 * nfs mknod rpc
1770 * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the
1771 * mode set to specify the file type and the size field for rdev.
1772 */
1773 static int
nfs_mknodrpc(struct vnode * dvp,struct vnode ** vpp,struct componentname * cnp,struct vattr * vap)1774 nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
1775 struct vattr *vap)
1776 {
1777 struct nfsvattr nfsva, dnfsva;
1778 struct vnode *newvp = NULL;
1779 struct nfsnode *np = NULL, *dnp;
1780 struct nfsfh *nfhp;
1781 struct vattr vattr;
1782 int error = 0, attrflag, dattrflag;
1783 u_int32_t rdev;
1784
1785 if (vap->va_type == VCHR || vap->va_type == VBLK)
1786 rdev = vap->va_rdev;
1787 else if (vap->va_type == VFIFO || vap->va_type == VSOCK)
1788 rdev = 0xffffffff;
1789 else
1790 return (EOPNOTSUPP);
1791 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1792 return (error);
1793 error = nfsrpc_mknod(dvp, cnp->cn_nameptr, cnp->cn_namelen, vap,
1794 rdev, vap->va_type, cnp->cn_cred, curthread, &dnfsva,
1795 &nfsva, &nfhp, &attrflag, &dattrflag);
1796 if (!error) {
1797 if (!nfhp)
1798 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1799 cnp->cn_namelen, cnp->cn_cred, curthread,
1800 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 0);
1801 if (nfhp)
1802 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1803 curthread, &np, LK_EXCLUSIVE);
1804 }
1805 if (dattrflag)
1806 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
1807 if (!error) {
1808 newvp = NFSTOV(np);
1809 if (attrflag != 0) {
1810 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
1811 if (error != 0)
1812 vput(newvp);
1813 }
1814 }
1815 if (!error) {
1816 *vpp = newvp;
1817 } else if (NFS_ISV4(dvp)) {
1818 error = nfscl_maperr(curthread, error, vap->va_uid,
1819 vap->va_gid);
1820 }
1821 dnp = VTONFS(dvp);
1822 NFSLOCKNODE(dnp);
1823 dnp->n_flag |= NMODIFIED;
1824 if (!dattrflag) {
1825 dnp->n_attrstamp = 0;
1826 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
1827 }
1828 NFSUNLOCKNODE(dnp);
1829 return (error);
1830 }
1831
1832 /*
1833 * nfs mknod vop
1834 * just call nfs_mknodrpc() to do the work.
1835 */
1836 /* ARGSUSED */
1837 static int
nfs_mknod(struct vop_mknod_args * ap)1838 nfs_mknod(struct vop_mknod_args *ap)
1839 {
1840 return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap));
1841 }
1842
1843 static struct mtx nfs_cverf_mtx;
1844 MTX_SYSINIT(nfs_cverf_mtx, &nfs_cverf_mtx, "NFS create verifier mutex",
1845 MTX_DEF);
1846
1847 static nfsquad_t
nfs_get_cverf(void)1848 nfs_get_cverf(void)
1849 {
1850 static nfsquad_t cverf;
1851 nfsquad_t ret;
1852 static int cverf_initialized = 0;
1853
1854 mtx_lock(&nfs_cverf_mtx);
1855 if (cverf_initialized == 0) {
1856 cverf.lval[0] = arc4random();
1857 cverf.lval[1] = arc4random();
1858 cverf_initialized = 1;
1859 } else
1860 cverf.qval++;
1861 ret = cverf;
1862 mtx_unlock(&nfs_cverf_mtx);
1863
1864 return (ret);
1865 }
1866
1867 /*
1868 * nfs file create call
1869 */
1870 static int
nfs_create(struct vop_create_args * ap)1871 nfs_create(struct vop_create_args *ap)
1872 {
1873 struct vnode *dvp = ap->a_dvp;
1874 struct vattr *vap = ap->a_vap;
1875 struct componentname *cnp = ap->a_cnp;
1876 struct nfsnode *np = NULL, *dnp;
1877 struct vnode *newvp = NULL;
1878 struct nfsmount *nmp;
1879 struct nfsvattr dnfsva, nfsva;
1880 struct nfsfh *nfhp;
1881 nfsquad_t cverf;
1882 int error = 0, attrflag, dattrflag, fmode = 0;
1883 struct vattr vattr;
1884 bool is_nameddir, needs_nameddir, opennamed;
1885
1886 /*
1887 * Oops, not for me..
1888 */
1889 if (vap->va_type == VSOCK)
1890 return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
1891
1892 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)))
1893 return (error);
1894 if (vap->va_vaflags & VA_EXCLUSIVE)
1895 fmode |= O_EXCL;
1896 dnp = VTONFS(dvp);
1897 nmp = VFSTONFS(dvp->v_mount);
1898 needs_nameddir = false;
1899 if (NFSHASNFSV4(nmp) && NFSHASNFSV4N(nmp)) {
1900 opennamed = (cnp->cn_flags & (OPENNAMED | ISLASTCN)) ==
1901 (OPENNAMED | ISLASTCN);
1902 is_nameddir = (vn_irflag_read(dvp) & VIRF_NAMEDDIR) != 0;
1903 if (opennamed || is_nameddir) {
1904 cnp->cn_flags &= ~MAKEENTRY;
1905 if (!is_nameddir)
1906 needs_nameddir = true;
1907 }
1908 }
1909
1910 /*
1911 * If the named attribute directory is needed, acquire it now.
1912 */
1913 if (needs_nameddir) {
1914 KASSERT(dnp->n_v4 == NULL, ("nfs_create: O_NAMEDATTR when"
1915 " n_v4 not NULL"));
1916 error = nfs_get_namedattrdir(dvp, cnp, &newvp);
1917 if (error != 0)
1918 return (error);
1919 dvp = newvp;
1920 dnp = VTONFS(dvp);
1921 newvp = NULL;
1922 }
1923
1924 again:
1925 /* For NFSv4, wait until any remove is done. */
1926 NFSLOCKNODE(dnp);
1927 while (NFSHASNFSV4(nmp) && (dnp->n_flag & NREMOVEINPROG)) {
1928 dnp->n_flag |= NREMOVEWANT;
1929 (void) msleep((caddr_t)dnp, &dnp->n_mtx, PZERO, "nfscrt", 0);
1930 }
1931 NFSUNLOCKNODE(dnp);
1932
1933 cverf = nfs_get_cverf();
1934 error = nfsrpc_create(dvp, cnp->cn_nameptr, cnp->cn_namelen,
1935 vap, cverf, fmode, cnp->cn_cred, curthread, &dnfsva, &nfsva,
1936 &nfhp, &attrflag, &dattrflag);
1937 if (!error) {
1938 if (nfhp == NULL)
1939 (void) nfsrpc_lookup(dvp, cnp->cn_nameptr,
1940 cnp->cn_namelen, cnp->cn_cred, curthread,
1941 &dnfsva, &nfsva, &nfhp, &attrflag, &dattrflag, 0);
1942 if (nfhp != NULL)
1943 error = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp,
1944 curthread, &np, LK_EXCLUSIVE);
1945 }
1946 if (dattrflag)
1947 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
1948 if (!error) {
1949 newvp = NFSTOV(np);
1950 if (attrflag == 0)
1951 error = nfsrpc_getattr(newvp, cnp->cn_cred, curthread,
1952 &nfsva);
1953 if (error == 0)
1954 error = nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
1955 }
1956 if (error) {
1957 if (newvp != NULL) {
1958 vput(newvp);
1959 newvp = NULL;
1960 }
1961 if (NFS_ISV34(dvp) && (fmode & O_EXCL) &&
1962 error == NFSERR_NOTSUPP) {
1963 fmode &= ~O_EXCL;
1964 goto again;
1965 }
1966 } else if (NFS_ISV34(dvp) && (fmode & O_EXCL)) {
1967 if (nfscl_checksattr(vap, &nfsva)) {
1968 error = nfsrpc_setattr(newvp, vap, NULL, cnp->cn_cred,
1969 curthread, &nfsva, &attrflag);
1970 if (error && (vap->va_uid != (uid_t)VNOVAL ||
1971 vap->va_gid != (gid_t)VNOVAL)) {
1972 /* try again without setting uid/gid */
1973 vap->va_uid = (uid_t)VNOVAL;
1974 vap->va_gid = (uid_t)VNOVAL;
1975 error = nfsrpc_setattr(newvp, vap, NULL,
1976 cnp->cn_cred, curthread, &nfsva, &attrflag);
1977 }
1978 if (attrflag)
1979 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
1980 0, 1);
1981 if (error != 0)
1982 vput(newvp);
1983 }
1984 }
1985 if (!error) {
1986 if ((cnp->cn_flags & MAKEENTRY) && attrflag) {
1987 if (dvp != newvp)
1988 cache_enter_time(dvp, newvp, cnp,
1989 &nfsva.na_ctime, NULL);
1990 else
1991 printf("nfs_create: bogus NFS server returned "
1992 "the directory as the new file object\n");
1993 }
1994 *ap->a_vpp = newvp;
1995 } else if (NFS_ISV4(dvp)) {
1996 error = nfscl_maperr(curthread, error, vap->va_uid,
1997 vap->va_gid);
1998 }
1999 NFSLOCKNODE(dnp);
2000 dnp->n_flag |= NMODIFIED;
2001 if (!dattrflag) {
2002 dnp->n_attrstamp = 0;
2003 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2004 }
2005 NFSUNLOCKNODE(dnp);
2006 if (needs_nameddir)
2007 vput(dvp);
2008 return (error);
2009 }
2010
2011 /*
2012 * nfs file remove call
2013 * To try and make nfs semantics closer to ufs semantics, a file that has
2014 * other processes using the vnode is renamed instead of removed and then
2015 * removed later on the last close.
2016 * - If v_usecount > 1
2017 * If a rename is not already in the works
2018 * call nfs_sillyrename() to set it up
2019 * else
2020 * do the remove rpc
2021 */
2022 static int
nfs_remove(struct vop_remove_args * ap)2023 nfs_remove(struct vop_remove_args *ap)
2024 {
2025 struct vnode *vp = ap->a_vp;
2026 struct vnode *dvp = ap->a_dvp;
2027 struct componentname *cnp = ap->a_cnp;
2028 struct nfsnode *np = VTONFS(vp);
2029 int error = 0;
2030 struct vattr vattr;
2031 struct nfsmount *nmp;
2032
2033 KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount"));
2034 if (vp->v_type == VDIR)
2035 error = EPERM;
2036 else if (vrefcnt(vp) == 1 || (np->n_sillyrename &&
2037 VOP_GETATTR(vp, &vattr, cnp->cn_cred) == 0 &&
2038 vattr.va_nlink > 1)) {
2039 nmp = VFSTONFS(vp->v_mount);
2040 /*
2041 * Purge the name cache so that the chance of a lookup for
2042 * the name succeeding while the remove is in progress is
2043 * minimized. Without node locking it can still happen, such
2044 * that an I/O op returns ESTALE, but since you get this if
2045 * another host removes the file..
2046 */
2047 cache_purge(vp);
2048 /*
2049 * throw away biocache buffers, mainly to avoid
2050 * unnecessary delayed writes later.
2051 * Flushing here would be more correct for the case
2052 * where nfs_close() did not do a flush. However, it
2053 * could be a large performance hit for some servers
2054 * and only matters when the file name being removed is
2055 * one of multiple hard links.
2056 */
2057 if (!NFSHASNFSV4(nmp) || !NFSHASNFSV4N(nmp) ||
2058 (nmp->nm_flag & NFSMNT_NOCTO) == 0)
2059 error = ncl_vinvalbuf(vp, 0, curthread, 1);
2060 if (error != EINTR && error != EIO)
2061 /* Do the rpc */
2062 error = nfs_removerpc(dvp, vp, cnp->cn_nameptr,
2063 cnp->cn_namelen, cnp->cn_cred, curthread, false);
2064 /*
2065 * Kludge City: If the first reply to the remove rpc is lost..
2066 * the reply to the retransmitted request will be ENOENT
2067 * since the file was in fact removed
2068 * Therefore, we cheat and return success.
2069 */
2070 if (error == ENOENT)
2071 error = 0;
2072 } else if (!np->n_sillyrename)
2073 error = nfs_sillyrename(dvp, vp, cnp);
2074 NFSLOCKNODE(np);
2075 np->n_attrstamp = 0;
2076 NFSUNLOCKNODE(np);
2077 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
2078 return (error);
2079 }
2080
2081 /*
2082 * nfs file remove rpc called from nfs_inactive
2083 */
2084 int
ncl_removeit(struct sillyrename * sp,struct vnode * vp)2085 ncl_removeit(struct sillyrename *sp, struct vnode *vp)
2086 {
2087 /*
2088 * Make sure that the directory vnode is still valid.
2089 * XXX we should lock sp->s_dvp here.
2090 */
2091 if (sp->s_dvp->v_type == VBAD)
2092 return (0);
2093 return (nfs_removerpc(sp->s_dvp, vp, sp->s_name, sp->s_namlen,
2094 sp->s_cred, NULL, true));
2095 }
2096
2097 /*
2098 * Handle the nfsremove_status reply from the RPC function.
2099 */
2100 static void
nfs_removestatus(struct vnode * vp,nfsremove_status file_status,bool silly,struct thread * td)2101 nfs_removestatus(struct vnode *vp, nfsremove_status file_status,
2102 bool silly, struct thread *td)
2103 {
2104
2105 switch (file_status) {
2106 case NLINK_ZERO:
2107 /* Get rid of any delegation. */
2108 nfscl_delegreturnvp(vp, false, td);
2109 /* FALLTHROUGH */
2110 case DELETED:
2111 /* Throw away buffer cache blocks. */
2112 (void)ncl_vinvalbuf(vp, 0, td, 1);
2113 break;
2114 case VALID:
2115 /* Nothing to do, delegation is still ok. */
2116 break;
2117 default:
2118 break;
2119 }
2120 }
2121
2122 /*
2123 * Nfs remove rpc, called from nfs_remove() and ncl_removeit().
2124 */
2125 static int
nfs_removerpc(struct vnode * dvp,struct vnode * vp,char * name,int namelen,struct ucred * cred,struct thread * td,bool silly)2126 nfs_removerpc(struct vnode *dvp, struct vnode *vp, char *name,
2127 int namelen, struct ucred *cred, struct thread *td, bool silly)
2128 {
2129 struct nfsvattr dnfsva, nfsva;
2130 struct nfsnode *dnp = VTONFS(dvp);
2131 struct nfsmount *nmp;
2132 int attrflag, error = 0, dattrflag;
2133 nfsremove_status file_status;
2134
2135 nmp = VFSTONFS(dvp->v_mount);
2136 NFSLOCKNODE(dnp);
2137 dnp->n_flag |= NREMOVEINPROG;
2138 NFSUNLOCKNODE(dnp);
2139 error = nfsrpc_remove(dvp, name, namelen, vp, &nfsva, &attrflag,
2140 &file_status, &dnfsva, &dattrflag, cred, td);
2141 NFSLOCKNODE(dnp);
2142 if ((dnp->n_flag & NREMOVEWANT)) {
2143 dnp->n_flag &= ~(NREMOVEWANT | NREMOVEINPROG);
2144 NFSUNLOCKNODE(dnp);
2145 wakeup((caddr_t)dnp);
2146 } else {
2147 dnp->n_flag &= ~NREMOVEINPROG;
2148 NFSUNLOCKNODE(dnp);
2149 }
2150
2151 if (NFSHASNFSV4(nmp) && NFSHASNFSV4N(nmp)) {
2152 if (file_status != DELETED && attrflag != 0)
2153 (void)nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
2154 if ((nmp->nm_flag & NFSMNT_NOCTO) != 0)
2155 nfs_removestatus(vp, file_status, silly, td);
2156 }
2157
2158 if (dattrflag != 0)
2159 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
2160 NFSLOCKNODE(dnp);
2161 dnp->n_flag |= NMODIFIED;
2162 if (dattrflag == 0) {
2163 dnp->n_attrstamp = 0;
2164 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2165 }
2166 NFSUNLOCKNODE(dnp);
2167 if (error && NFS_ISV4(dvp))
2168 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2169 return (error);
2170 }
2171
2172 /*
2173 * nfs file rename call
2174 */
2175 static int
nfs_rename(struct vop_rename_args * ap)2176 nfs_rename(struct vop_rename_args *ap)
2177 {
2178 struct vnode *fvp = ap->a_fvp;
2179 struct vnode *tvp = ap->a_tvp;
2180 struct vnode *fdvp = ap->a_fdvp;
2181 struct vnode *tdvp = ap->a_tdvp;
2182 struct componentname *tcnp = ap->a_tcnp;
2183 struct componentname *fcnp = ap->a_fcnp;
2184 struct nfsnode *fnp = VTONFS(ap->a_fvp);
2185 struct nfsnode *tdnp = VTONFS(ap->a_tdvp);
2186 struct nfsv4node *newv4 = NULL;
2187 struct nfsmount *nmp;
2188 int error;
2189
2190 /* Check for cross-device rename */
2191 if ((fvp->v_mount != tdvp->v_mount) ||
2192 (tvp && (fvp->v_mount != tvp->v_mount))) {
2193 error = EXDEV;
2194 goto out;
2195 }
2196 nmp = VFSTONFS(fvp->v_mount);
2197
2198 if (fvp == tvp) {
2199 printf("nfs_rename: fvp == tvp (can't happen)\n");
2200 error = 0;
2201 goto out;
2202 }
2203 if ((error = NFSVOPLOCK(fvp, LK_EXCLUSIVE)) != 0)
2204 goto out;
2205
2206 /*
2207 * We have to flush B_DELWRI data prior to renaming
2208 * the file. If we don't, the delayed-write buffers
2209 * can be flushed out later after the file has gone stale
2210 * under NFSV3. NFSV2 does not have this problem because
2211 * ( as far as I can tell ) it flushes dirty buffers more
2212 * often.
2213 *
2214 * Skip the rename operation if the fsync fails, this can happen
2215 * due to the server's volume being full, when we pushed out data
2216 * that was written back to our cache earlier. Not checking for
2217 * this condition can result in potential (silent) data loss.
2218 */
2219 if ((nmp->nm_flag & NFSMNT_NOCTO) == 0 || !NFSHASNFSV4(nmp) ||
2220 !NFSHASNFSV4N(nmp) || nfscl_mustflush(fvp) != 0)
2221 error = VOP_FSYNC(fvp, MNT_WAIT, curthread);
2222 NFSVOPUNLOCK(fvp);
2223 if (error == 0 && tvp != NULL && ((nmp->nm_flag & NFSMNT_NOCTO) == 0 ||
2224 !NFSHASNFSV4(nmp) || !NFSHASNFSV4N(nmp) ||
2225 nfscl_mustflush(tvp) != 0))
2226 error = VOP_FSYNC(tvp, MNT_WAIT, curthread);
2227 if (error != 0)
2228 goto out;
2229
2230 /*
2231 * If the tvp exists and is in use, sillyrename it before doing the
2232 * rename of the new file over it.
2233 * XXX Can't sillyrename a directory.
2234 */
2235 if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename &&
2236 tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) {
2237 vput(tvp);
2238 tvp = NULL;
2239 }
2240
2241 error = nfs_renamerpc(fdvp, fvp, fcnp->cn_nameptr, fcnp->cn_namelen,
2242 tdvp, tvp, tcnp->cn_nameptr, tcnp->cn_namelen, false, tcnp->cn_cred,
2243 curthread);
2244
2245 if (error == 0 && NFS_ISV4(tdvp)) {
2246 /*
2247 * For NFSv4, check to see if it is the same name and
2248 * replace the name, if it is different.
2249 */
2250 newv4 = malloc(
2251 sizeof (struct nfsv4node) +
2252 tdnp->n_fhp->nfh_len + tcnp->cn_namelen - 1,
2253 M_NFSV4NODE, M_WAITOK);
2254 NFSLOCKNODE(tdnp);
2255 NFSLOCKNODE(fnp);
2256 if (fnp->n_v4 != NULL && fvp->v_type == VREG &&
2257 (fnp->n_v4->n4_namelen != tcnp->cn_namelen ||
2258 NFSBCMP(tcnp->cn_nameptr, NFS4NODENAME(fnp->n_v4),
2259 tcnp->cn_namelen) ||
2260 tdnp->n_fhp->nfh_len != fnp->n_v4->n4_fhlen ||
2261 NFSBCMP(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
2262 tdnp->n_fhp->nfh_len))) {
2263 free(fnp->n_v4, M_NFSV4NODE);
2264 fnp->n_v4 = newv4;
2265 newv4 = NULL;
2266 fnp->n_v4->n4_fhlen = tdnp->n_fhp->nfh_len;
2267 fnp->n_v4->n4_namelen = tcnp->cn_namelen;
2268 NFSBCOPY(tdnp->n_fhp->nfh_fh, fnp->n_v4->n4_data,
2269 tdnp->n_fhp->nfh_len);
2270 NFSBCOPY(tcnp->cn_nameptr,
2271 NFS4NODENAME(fnp->n_v4), tcnp->cn_namelen);
2272 }
2273 NFSUNLOCKNODE(tdnp);
2274 NFSUNLOCKNODE(fnp);
2275 if (newv4 != NULL)
2276 free(newv4, M_NFSV4NODE);
2277 }
2278
2279 if (fvp->v_type == VDIR) {
2280 if (tvp != NULL && tvp->v_type == VDIR)
2281 cache_purge(tdvp);
2282 cache_purge(fdvp);
2283 }
2284
2285 out:
2286 if (tdvp == tvp)
2287 vrele(tdvp);
2288 else
2289 vput(tdvp);
2290 if (tvp)
2291 vput(tvp);
2292 vrele(fdvp);
2293 vrele(fvp);
2294 /*
2295 * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry.
2296 */
2297 if (error == ENOENT)
2298 error = 0;
2299 return (error);
2300 }
2301
2302 /*
2303 * nfs file rename rpc called from nfs_remove() above
2304 */
2305 static int
nfs_renameit(struct vnode * sdvp,struct vnode * svp,struct componentname * scnp,struct sillyrename * sp)2306 nfs_renameit(struct vnode *sdvp, struct vnode *svp, struct componentname *scnp,
2307 struct sillyrename *sp)
2308 {
2309
2310 return (nfs_renamerpc(sdvp, svp, scnp->cn_nameptr, scnp->cn_namelen,
2311 sdvp, NULL, sp->s_name, sp->s_namlen, true, scnp->cn_cred,
2312 curthread));
2313 }
2314
2315 /*
2316 * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit().
2317 */
2318 static int
nfs_renamerpc(struct vnode * fdvp,struct vnode * fvp,char * fnameptr,int fnamelen,struct vnode * tdvp,struct vnode * tvp,char * tnameptr,int tnamelen,bool silly,struct ucred * cred,struct thread * td)2319 nfs_renamerpc(struct vnode *fdvp, struct vnode *fvp, char *fnameptr,
2320 int fnamelen, struct vnode *tdvp, struct vnode *tvp, char *tnameptr,
2321 int tnamelen, bool silly, struct ucred *cred, struct thread *td)
2322 {
2323 struct nfsvattr fnfsva, tnfsva, tvpnfsva;
2324 struct nfsnode *fdnp = VTONFS(fdvp);
2325 struct nfsnode *tdnp = VTONFS(tdvp);
2326 struct nfsmount *nmp;
2327 int error = 0, fattrflag, tattrflag, tvpattrflag;
2328 nfsremove_status tvp_status;
2329
2330 nmp = VFSTONFS(fdvp->v_mount);
2331 error = nfsrpc_rename(fdvp, fvp, fnameptr, fnamelen, tdvp, tvp,
2332 tnameptr, tnamelen, &tvp_status, &fnfsva, &tnfsva, &fattrflag,
2333 &tattrflag, &tvpnfsva, &tvpattrflag, cred, td);
2334 NFSLOCKNODE(fdnp);
2335 fdnp->n_flag |= NMODIFIED;
2336 if (fattrflag != 0) {
2337 NFSUNLOCKNODE(fdnp);
2338 (void) nfscl_loadattrcache(&fdvp, &fnfsva, NULL, 0, 1);
2339 } else {
2340 fdnp->n_attrstamp = 0;
2341 NFSUNLOCKNODE(fdnp);
2342 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp);
2343 }
2344 NFSLOCKNODE(tdnp);
2345 tdnp->n_flag |= NMODIFIED;
2346 if (tattrflag != 0) {
2347 NFSUNLOCKNODE(tdnp);
2348 (void) nfscl_loadattrcache(&tdvp, &tnfsva, NULL, 0, 1);
2349 } else {
2350 tdnp->n_attrstamp = 0;
2351 NFSUNLOCKNODE(tdnp);
2352 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
2353 }
2354
2355 if (tvp != NULL) {
2356 if (NFSHASNFSV4(nmp) && NFSHASNFSV4N(nmp) &&
2357 (nmp->nm_flag & NFSMNT_NOCTO) != 0)
2358 nfs_removestatus(tvp, tvp_status, silly, td);
2359 if (!silly && tvpattrflag != 0)
2360 (void)nfscl_loadattrcache(&tvp, &tvpnfsva, NULL, 0, 1);
2361 }
2362
2363 if (error && NFS_ISV4(fdvp))
2364 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2365 return (error);
2366 }
2367
2368 /*
2369 * nfs hard link create call
2370 */
2371 static int
nfs_link(struct vop_link_args * ap)2372 nfs_link(struct vop_link_args *ap)
2373 {
2374 struct vnode *vp = ap->a_vp;
2375 struct vnode *tdvp = ap->a_tdvp;
2376 struct componentname *cnp = ap->a_cnp;
2377 struct nfsnode *np, *tdnp;
2378 struct nfsvattr nfsva, dnfsva;
2379 int error = 0, attrflag, dattrflag;
2380
2381 /*
2382 * Push all writes to the server, so that the attribute cache
2383 * doesn't get "out of sync" with the server.
2384 * XXX There should be a better way!
2385 */
2386 #ifdef notnow
2387 VOP_FSYNC(vp, MNT_WAIT, curthread);
2388 #endif
2389
2390 error = nfsrpc_link(tdvp, vp, cnp->cn_nameptr, cnp->cn_namelen,
2391 cnp->cn_cred, curthread, &dnfsva, &nfsva, &attrflag, &dattrflag);
2392 tdnp = VTONFS(tdvp);
2393 NFSLOCKNODE(tdnp);
2394 tdnp->n_flag |= NMODIFIED;
2395 if (dattrflag != 0) {
2396 NFSUNLOCKNODE(tdnp);
2397 (void) nfscl_loadattrcache(&tdvp, &dnfsva, NULL, 0, 1);
2398 } else {
2399 tdnp->n_attrstamp = 0;
2400 NFSUNLOCKNODE(tdnp);
2401 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp);
2402 }
2403 if (attrflag)
2404 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
2405 else {
2406 np = VTONFS(vp);
2407 NFSLOCKNODE(np);
2408 np->n_attrstamp = 0;
2409 NFSUNLOCKNODE(np);
2410 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
2411 }
2412 /*
2413 * If negative lookup caching is enabled, I might as well
2414 * add an entry for this node. Not necessary for correctness,
2415 * but if negative caching is enabled, then the system
2416 * must care about lookup caching hit rate, so...
2417 */
2418 if (VFSTONFS(vp->v_mount)->nm_negnametimeo != 0 &&
2419 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
2420 if (tdvp != vp)
2421 cache_enter_time(tdvp, vp, cnp, &nfsva.na_ctime, NULL);
2422 else
2423 printf("nfs_link: bogus NFS server returned "
2424 "the directory as the new link\n");
2425 }
2426 if (error && NFS_ISV4(vp))
2427 error = nfscl_maperr(curthread, error, (uid_t)0,
2428 (gid_t)0);
2429 return (error);
2430 }
2431
2432 /*
2433 * nfs symbolic link create call
2434 */
2435 static int
nfs_symlink(struct vop_symlink_args * ap)2436 nfs_symlink(struct vop_symlink_args *ap)
2437 {
2438 struct vnode *dvp = ap->a_dvp;
2439 struct vattr *vap = ap->a_vap;
2440 struct componentname *cnp = ap->a_cnp;
2441 struct nfsvattr nfsva, dnfsva;
2442 struct nfsfh *nfhp;
2443 struct nfsnode *np = NULL, *dnp;
2444 struct vnode *newvp = NULL;
2445 int error = 0, attrflag, dattrflag, ret;
2446
2447 vap->va_type = VLNK;
2448 error = nfsrpc_symlink(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2449 ap->a_target, vap, cnp->cn_cred, curthread, &dnfsva,
2450 &nfsva, &nfhp, &attrflag, &dattrflag);
2451 if (nfhp) {
2452 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, curthread,
2453 &np, LK_EXCLUSIVE);
2454 if (!ret)
2455 newvp = NFSTOV(np);
2456 else if (!error)
2457 error = ret;
2458 }
2459 if (newvp != NULL) {
2460 if (attrflag)
2461 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
2462 } else if (!error) {
2463 /*
2464 * If we do not have an error and we could not extract the
2465 * newvp from the response due to the request being NFSv2, we
2466 * have to do a lookup in order to obtain a newvp to return.
2467 */
2468 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2469 cnp->cn_cred, curthread, &np);
2470 if (!error)
2471 newvp = NFSTOV(np);
2472 }
2473 if (error) {
2474 if (newvp)
2475 vput(newvp);
2476 if (NFS_ISV4(dvp))
2477 error = nfscl_maperr(curthread, error,
2478 vap->va_uid, vap->va_gid);
2479 } else {
2480 *ap->a_vpp = newvp;
2481 }
2482
2483 dnp = VTONFS(dvp);
2484 NFSLOCKNODE(dnp);
2485 dnp->n_flag |= NMODIFIED;
2486 if (dattrflag != 0) {
2487 NFSUNLOCKNODE(dnp);
2488 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
2489 } else {
2490 dnp->n_attrstamp = 0;
2491 NFSUNLOCKNODE(dnp);
2492 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2493 }
2494 /*
2495 * If negative lookup caching is enabled, I might as well
2496 * add an entry for this node. Not necessary for correctness,
2497 * but if negative caching is enabled, then the system
2498 * must care about lookup caching hit rate, so...
2499 */
2500 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2501 (cnp->cn_flags & MAKEENTRY) && attrflag != 0 && error == 0) {
2502 if (dvp != newvp)
2503 cache_enter_time(dvp, newvp, cnp, &nfsva.na_ctime,
2504 NULL);
2505 else
2506 printf("nfs_symlink: bogus NFS server returned "
2507 "the directory as the new file object\n");
2508 }
2509 return (error);
2510 }
2511
2512 /*
2513 * nfs make dir call
2514 */
2515 static int
nfs_mkdir(struct vop_mkdir_args * ap)2516 nfs_mkdir(struct vop_mkdir_args *ap)
2517 {
2518 struct vnode *dvp = ap->a_dvp;
2519 struct vattr *vap = ap->a_vap;
2520 struct componentname *cnp = ap->a_cnp;
2521 struct nfsnode *np = NULL, *dnp;
2522 struct vnode *newvp = NULL;
2523 struct vattr vattr;
2524 struct nfsfh *nfhp;
2525 struct nfsvattr nfsva, dnfsva;
2526 int error = 0, attrflag, dattrflag, ret;
2527
2528 if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
2529 return (error);
2530 vap->va_type = VDIR;
2531 error = nfsrpc_mkdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2532 vap, cnp->cn_cred, curthread, &dnfsva, &nfsva, &nfhp,
2533 &attrflag, &dattrflag);
2534 dnp = VTONFS(dvp);
2535 NFSLOCKNODE(dnp);
2536 dnp->n_flag |= NMODIFIED;
2537 if (dattrflag != 0) {
2538 NFSUNLOCKNODE(dnp);
2539 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
2540 } else {
2541 dnp->n_attrstamp = 0;
2542 NFSUNLOCKNODE(dnp);
2543 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2544 }
2545 if (nfhp) {
2546 ret = nfscl_nget(dvp->v_mount, dvp, nfhp, cnp, curthread,
2547 &np, LK_EXCLUSIVE);
2548 if (!ret) {
2549 newvp = NFSTOV(np);
2550 if (attrflag)
2551 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL,
2552 0, 1);
2553 } else if (!error)
2554 error = ret;
2555 }
2556 if (!error && newvp == NULL) {
2557 error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2558 cnp->cn_cred, curthread, &np);
2559 if (!error) {
2560 newvp = NFSTOV(np);
2561 if (newvp->v_type != VDIR)
2562 error = EEXIST;
2563 }
2564 }
2565 if (error) {
2566 if (newvp)
2567 vput(newvp);
2568 if (NFS_ISV4(dvp))
2569 error = nfscl_maperr(curthread, error,
2570 vap->va_uid, vap->va_gid);
2571 } else {
2572 /*
2573 * If negative lookup caching is enabled, I might as well
2574 * add an entry for this node. Not necessary for correctness,
2575 * but if negative caching is enabled, then the system
2576 * must care about lookup caching hit rate, so...
2577 */
2578 if (VFSTONFS(dvp->v_mount)->nm_negnametimeo != 0 &&
2579 (cnp->cn_flags & MAKEENTRY) &&
2580 attrflag != 0 && dattrflag != 0) {
2581 if (dvp != newvp)
2582 cache_enter_time(dvp, newvp, cnp,
2583 &nfsva.na_ctime, &dnfsva.na_ctime);
2584 else
2585 printf("nfs_mkdir: bogus NFS server returned "
2586 "the directory that the directory was "
2587 "created in as the new file object\n");
2588 }
2589 *ap->a_vpp = newvp;
2590 }
2591 return (error);
2592 }
2593
2594 /*
2595 * nfs remove directory call
2596 */
2597 static int
nfs_rmdir(struct vop_rmdir_args * ap)2598 nfs_rmdir(struct vop_rmdir_args *ap)
2599 {
2600 struct vnode *vp = ap->a_vp;
2601 struct vnode *dvp = ap->a_dvp;
2602 struct componentname *cnp = ap->a_cnp;
2603 struct nfsnode *dnp;
2604 struct nfsvattr dnfsva;
2605 int error, dattrflag;
2606
2607 if (dvp == vp)
2608 return (EINVAL);
2609 error = nfsrpc_rmdir(dvp, cnp->cn_nameptr, cnp->cn_namelen,
2610 cnp->cn_cred, curthread, &dnfsva, &dattrflag);
2611 dnp = VTONFS(dvp);
2612 NFSLOCKNODE(dnp);
2613 dnp->n_flag |= NMODIFIED;
2614 if (dattrflag != 0) {
2615 NFSUNLOCKNODE(dnp);
2616 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
2617 } else {
2618 dnp->n_attrstamp = 0;
2619 NFSUNLOCKNODE(dnp);
2620 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
2621 }
2622
2623 cache_purge(dvp);
2624 cache_purge(vp);
2625 if (error && NFS_ISV4(dvp))
2626 error = nfscl_maperr(curthread, error, (uid_t)0,
2627 (gid_t)0);
2628 /*
2629 * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry.
2630 */
2631 if (error == ENOENT)
2632 error = 0;
2633 return (error);
2634 }
2635
2636 /*
2637 * nfs readdir call
2638 */
2639 static int
nfs_readdir(struct vop_readdir_args * ap)2640 nfs_readdir(struct vop_readdir_args *ap)
2641 {
2642 struct vnode *vp = ap->a_vp;
2643 struct nfsnode *np = VTONFS(vp);
2644 struct uio *uio = ap->a_uio;
2645 ssize_t tresid, left;
2646 int error = 0;
2647 struct vattr vattr;
2648
2649 if (ap->a_eofflag != NULL)
2650 *ap->a_eofflag = 0;
2651 if (vp->v_type != VDIR)
2652 return(EPERM);
2653
2654 /*
2655 * First, check for hit on the EOF offset cache
2656 */
2657 NFSLOCKNODE(np);
2658 if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset &&
2659 (np->n_flag & NMODIFIED) == 0) {
2660 NFSUNLOCKNODE(np);
2661 if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) {
2662 NFSLOCKNODE(np);
2663 if ((NFS_ISV4(vp) && np->n_change == vattr.va_filerev) ||
2664 !NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) {
2665 NFSUNLOCKNODE(np);
2666 NFSINCRGLOBAL(nfsstatsv1.direofcache_hits);
2667 if (ap->a_eofflag != NULL)
2668 *ap->a_eofflag = 1;
2669 return (0);
2670 } else
2671 NFSUNLOCKNODE(np);
2672 }
2673 } else
2674 NFSUNLOCKNODE(np);
2675
2676 /*
2677 * NFS always guarantees that directory entries don't straddle
2678 * DIRBLKSIZ boundaries. As such, we need to limit the size
2679 * to an exact multiple of DIRBLKSIZ, to avoid copying a partial
2680 * directory entry.
2681 */
2682 left = uio->uio_resid % DIRBLKSIZ;
2683 if (left == uio->uio_resid)
2684 return (EINVAL);
2685 uio->uio_resid -= left;
2686
2687 /*
2688 * For readdirplus, if starting to read the directory,
2689 * purge the name cache, since it will be reloaded by
2690 * this directory read.
2691 * This removes potentially stale name cache entries.
2692 */
2693 if (uio->uio_offset == 0 &&
2694 (VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_RDIRPLUS) != 0)
2695 cache_purge(vp);
2696
2697 /*
2698 * Call ncl_bioread() to do the real work.
2699 */
2700 tresid = uio->uio_resid;
2701 error = ncl_bioread(vp, uio, 0, ap->a_cred);
2702
2703 if (!error && uio->uio_resid == tresid) {
2704 NFSINCRGLOBAL(nfsstatsv1.direofcache_misses);
2705 if (ap->a_eofflag != NULL)
2706 *ap->a_eofflag = 1;
2707 }
2708
2709 /* Add the partial DIRBLKSIZ (left) back in. */
2710 uio->uio_resid += left;
2711 return (error);
2712 }
2713
2714 /*
2715 * Readdir rpc call.
2716 * Called from below the buffer cache by ncl_doio().
2717 */
2718 int
ncl_readdirrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred,struct thread * td)2719 ncl_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2720 struct thread *td)
2721 {
2722 struct nfsvattr nfsva;
2723 nfsuint64 *cookiep, cookie;
2724 struct nfsnode *dnp = VTONFS(vp);
2725 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2726 int error = 0, eof, attrflag;
2727
2728 KASSERT(uiop->uio_iovcnt == 1 &&
2729 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2730 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2731 ("nfs readdirrpc bad uio"));
2732
2733 /*
2734 * If there is no cookie, assume directory was stale.
2735 */
2736 ncl_dircookie_lock(dnp);
2737 NFSUNLOCKNODE(dnp);
2738 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2739 if (cookiep) {
2740 cookie = *cookiep;
2741 ncl_dircookie_unlock(dnp);
2742 } else {
2743 ncl_dircookie_unlock(dnp);
2744 return (NFSERR_BAD_COOKIE);
2745 }
2746
2747 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2748 (void)ncl_fsinfo(nmp, vp, cred, td);
2749
2750 error = nfsrpc_readdir(vp, uiop, &cookie, cred, td, &nfsva,
2751 &attrflag, &eof);
2752 if (attrflag)
2753 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
2754
2755 if (!error) {
2756 /*
2757 * We are now either at the end of the directory or have filled
2758 * the block.
2759 */
2760 if (eof) {
2761 NFSLOCKNODE(dnp);
2762 dnp->n_direofoffset = uiop->uio_offset;
2763 NFSUNLOCKNODE(dnp);
2764 } else {
2765 if (uiop->uio_resid > 0)
2766 printf("EEK! readdirrpc resid > 0\n");
2767 ncl_dircookie_lock(dnp);
2768 NFSUNLOCKNODE(dnp);
2769 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2770 *cookiep = cookie;
2771 ncl_dircookie_unlock(dnp);
2772 }
2773 } else if (NFS_ISV4(vp)) {
2774 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2775 }
2776 return (error);
2777 }
2778
2779 /*
2780 * NFS V3 readdir plus RPC. Used in place of ncl_readdirrpc().
2781 */
2782 int
ncl_readdirplusrpc(struct vnode * vp,struct uio * uiop,struct ucred * cred,struct thread * td)2783 ncl_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred,
2784 struct thread *td)
2785 {
2786 struct nfsvattr nfsva;
2787 nfsuint64 *cookiep, cookie;
2788 struct nfsnode *dnp = VTONFS(vp);
2789 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
2790 int error = 0, attrflag, eof;
2791
2792 KASSERT(uiop->uio_iovcnt == 1 &&
2793 (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 &&
2794 (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0,
2795 ("nfs readdirplusrpc bad uio"));
2796
2797 /*
2798 * If there is no cookie, assume directory was stale.
2799 */
2800 ncl_dircookie_lock(dnp);
2801 NFSUNLOCKNODE(dnp);
2802 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 0);
2803 if (cookiep) {
2804 cookie = *cookiep;
2805 ncl_dircookie_unlock(dnp);
2806 } else {
2807 ncl_dircookie_unlock(dnp);
2808 return (NFSERR_BAD_COOKIE);
2809 }
2810
2811 if (NFSHASNFSV3(nmp) && !NFSHASGOTFSINFO(nmp))
2812 (void)ncl_fsinfo(nmp, vp, cred, td);
2813 error = nfsrpc_readdirplus(vp, uiop, &cookie, cred, td, &nfsva,
2814 &attrflag, &eof);
2815 if (attrflag)
2816 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
2817
2818 if (!error) {
2819 /*
2820 * We are now either at end of the directory or have filled the
2821 * the block.
2822 */
2823 if (eof) {
2824 NFSLOCKNODE(dnp);
2825 dnp->n_direofoffset = uiop->uio_offset;
2826 NFSUNLOCKNODE(dnp);
2827 } else {
2828 if (uiop->uio_resid > 0)
2829 printf("EEK! readdirplusrpc resid > 0\n");
2830 ncl_dircookie_lock(dnp);
2831 NFSUNLOCKNODE(dnp);
2832 cookiep = ncl_getcookie(dnp, uiop->uio_offset, 1);
2833 *cookiep = cookie;
2834 ncl_dircookie_unlock(dnp);
2835 }
2836 } else if (NFS_ISV4(vp)) {
2837 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
2838 }
2839 return (error);
2840 }
2841
2842 /*
2843 * Silly rename. To make the NFS filesystem that is stateless look a little
2844 * more like the "ufs" a remove of an active vnode is translated to a rename
2845 * to a funny looking filename that is removed by nfs_inactive on the
2846 * nfsnode. There is the potential for another process on a different client
2847 * to create the same funny name between the nfs_lookitup() fails and the
2848 * nfs_rename() completes, but...
2849 */
2850 static int
nfs_sillyrename(struct vnode * dvp,struct vnode * vp,struct componentname * cnp)2851 nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp)
2852 {
2853 struct sillyrename *sp;
2854 struct nfsnode *np;
2855 int error;
2856 short pid;
2857 unsigned int lticks;
2858
2859 cache_purge(dvp);
2860 np = VTONFS(vp);
2861 KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir"));
2862 sp = malloc(sizeof (struct sillyrename),
2863 M_NEWNFSREQ, M_WAITOK);
2864 sp->s_cred = crhold(cnp->cn_cred);
2865 sp->s_dvp = dvp;
2866 VREF(dvp);
2867
2868 /*
2869 * Fudge together a funny name.
2870 * Changing the format of the funny name to accommodate more
2871 * sillynames per directory.
2872 * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is
2873 * CPU ticks since boot.
2874 */
2875 pid = curthread->td_proc->p_pid;
2876 lticks = (unsigned int)ticks;
2877 for ( ; ; ) {
2878 sp->s_namlen = sprintf(sp->s_name,
2879 ".nfs.%08x.%04x4.4", lticks,
2880 pid);
2881 if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2882 curthread, NULL))
2883 break;
2884 lticks++;
2885 }
2886 error = nfs_renameit(dvp, vp, cnp, sp);
2887 if (error)
2888 goto bad;
2889 error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred,
2890 curthread, &np);
2891 np->n_sillyrename = sp;
2892 return (0);
2893 bad:
2894 vrele(sp->s_dvp);
2895 crfree(sp->s_cred);
2896 free(sp, M_NEWNFSREQ);
2897 return (error);
2898 }
2899
2900 /*
2901 * Look up a file name and optionally either update the file handle or
2902 * allocate an nfsnode, depending on the value of npp.
2903 * npp == NULL --> just do the lookup
2904 * *npp == NULL --> allocate a new nfsnode and make sure attributes are
2905 * handled too
2906 * *npp != NULL --> update the file handle in the vnode
2907 */
2908 static int
nfs_lookitup(struct vnode * dvp,char * name,int len,struct ucred * cred,struct thread * td,struct nfsnode ** npp)2909 nfs_lookitup(struct vnode *dvp, char *name, int len, struct ucred *cred,
2910 struct thread *td, struct nfsnode **npp)
2911 {
2912 struct vnode *newvp = NULL, *vp;
2913 struct nfsnode *np, *dnp = VTONFS(dvp);
2914 struct nfsfh *nfhp, *onfhp;
2915 struct nfsvattr nfsva, dnfsva;
2916 struct componentname cn;
2917 int error = 0, attrflag, dattrflag;
2918 u_int hash;
2919 struct timespec ts;
2920
2921 nanouptime(&ts);
2922 error = nfsrpc_lookup(dvp, name, len, cred, td, &dnfsva, &nfsva,
2923 &nfhp, &attrflag, &dattrflag, 0);
2924 if (dattrflag)
2925 (void) nfscl_loadattrcache(&dvp, &dnfsva, NULL, 0, 1);
2926 if (npp && !error) {
2927 if (*npp != NULL) {
2928 np = *npp;
2929 vp = NFSTOV(np);
2930 /*
2931 * For NFSv4, check to see if it is the same name and
2932 * replace the name, if it is different.
2933 */
2934 if (np->n_v4 != NULL && nfsva.na_type == VREG &&
2935 (np->n_v4->n4_namelen != len ||
2936 NFSBCMP(name, NFS4NODENAME(np->n_v4), len) ||
2937 dnp->n_fhp->nfh_len != np->n_v4->n4_fhlen ||
2938 NFSBCMP(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2939 dnp->n_fhp->nfh_len))) {
2940 free(np->n_v4, M_NFSV4NODE);
2941 np->n_v4 = malloc(
2942 sizeof (struct nfsv4node) +
2943 dnp->n_fhp->nfh_len + len - 1,
2944 M_NFSV4NODE, M_WAITOK);
2945 np->n_v4->n4_fhlen = dnp->n_fhp->nfh_len;
2946 np->n_v4->n4_namelen = len;
2947 NFSBCOPY(dnp->n_fhp->nfh_fh, np->n_v4->n4_data,
2948 dnp->n_fhp->nfh_len);
2949 NFSBCOPY(name, NFS4NODENAME(np->n_v4), len);
2950 }
2951 hash = fnv_32_buf(nfhp->nfh_fh, nfhp->nfh_len,
2952 FNV1_32_INIT);
2953 onfhp = np->n_fhp;
2954 /*
2955 * Rehash node for new file handle.
2956 */
2957 vfs_hash_rehash(vp, hash);
2958 np->n_fhp = nfhp;
2959 if (onfhp != NULL)
2960 free(onfhp, M_NFSFH);
2961 newvp = NFSTOV(np);
2962 } else if (NFS_CMPFH(dnp, nfhp->nfh_fh, nfhp->nfh_len)) {
2963 free(nfhp, M_NFSFH);
2964 VREF(dvp);
2965 newvp = dvp;
2966 } else {
2967 cn.cn_nameptr = name;
2968 cn.cn_namelen = len;
2969 error = nfscl_nget(dvp->v_mount, dvp, nfhp, &cn, td,
2970 &np, LK_EXCLUSIVE);
2971 if (error)
2972 return (error);
2973 newvp = NFSTOV(np);
2974 /*
2975 * If n_localmodtime >= time before RPC, then
2976 * a file modification operation, such as
2977 * VOP_SETATTR() of size, has occurred while
2978 * the Lookup RPC and acquisition of the vnode
2979 * happened. As such, the attributes might
2980 * be stale, with possibly an incorrect size.
2981 */
2982 NFSLOCKNODE(np);
2983 if (timespecisset(&np->n_localmodtime) &&
2984 timespeccmp(&np->n_localmodtime, &ts, >=)) {
2985 NFSCL_DEBUG(4, "nfs_lookitup: localmod "
2986 "stale attributes\n");
2987 attrflag = 0;
2988 }
2989 NFSUNLOCKNODE(np);
2990 }
2991 if (!attrflag && *npp == NULL) {
2992 if (newvp == dvp)
2993 vrele(newvp);
2994 else
2995 vput(newvp);
2996 return (ENOENT);
2997 }
2998 if (attrflag)
2999 (void) nfscl_loadattrcache(&newvp, &nfsva, NULL, 0, 1);
3000 }
3001 if (npp && *npp == NULL) {
3002 if (error) {
3003 if (newvp) {
3004 if (newvp == dvp)
3005 vrele(newvp);
3006 else
3007 vput(newvp);
3008 }
3009 } else
3010 *npp = np;
3011 }
3012 if (error && NFS_ISV4(dvp))
3013 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
3014 return (error);
3015 }
3016
3017 /*
3018 * Nfs Version 3 and 4 commit rpc
3019 */
3020 int
ncl_commit(struct vnode * vp,u_quad_t offset,int cnt,struct ucred * cred,struct thread * td)3021 ncl_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred,
3022 struct thread *td)
3023 {
3024 struct nfsvattr nfsva;
3025 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
3026 struct nfsnode *np;
3027 struct uio uio;
3028 int error, attrflag;
3029
3030 np = VTONFS(vp);
3031 error = EIO;
3032 attrflag = 0;
3033 if (NFSHASPNFS(nmp) && (np->n_flag & NDSCOMMIT) != 0) {
3034 uio.uio_offset = offset;
3035 uio.uio_resid = cnt;
3036 error = nfscl_doiods(vp, &uio, NULL, NULL,
3037 NFSV4OPEN_ACCESSWRITE, 1, cred, td);
3038 if (error != 0) {
3039 NFSLOCKNODE(np);
3040 np->n_flag &= ~NDSCOMMIT;
3041 NFSUNLOCKNODE(np);
3042 }
3043 }
3044 if (error != 0) {
3045 mtx_lock(&nmp->nm_mtx);
3046 if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) {
3047 mtx_unlock(&nmp->nm_mtx);
3048 return (0);
3049 }
3050 mtx_unlock(&nmp->nm_mtx);
3051 error = nfsrpc_commit(vp, offset, cnt, cred, td, &nfsva,
3052 &attrflag);
3053 }
3054 if (attrflag != 0)
3055 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
3056 if (error != 0 && NFS_ISV4(vp))
3057 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
3058 return (error);
3059 }
3060
3061 /*
3062 * Strategy routine.
3063 * For async requests when nfsiod(s) are running, queue the request by
3064 * calling ncl_asyncio(), otherwise just all ncl_doio() to do the
3065 * request.
3066 */
3067 static int
nfs_strategy(struct vop_strategy_args * ap)3068 nfs_strategy(struct vop_strategy_args *ap)
3069 {
3070 struct buf *bp;
3071 struct vnode *vp;
3072 struct ucred *cr;
3073
3074 bp = ap->a_bp;
3075 vp = ap->a_vp;
3076 KASSERT(bp->b_vp == vp, ("missing b_getvp"));
3077 KASSERT(!(bp->b_flags & B_DONE),
3078 ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp));
3079
3080 if (vp->v_type == VREG && bp->b_blkno == bp->b_lblkno)
3081 bp->b_blkno = bp->b_lblkno * (vp->v_bufobj.bo_bsize /
3082 DEV_BSIZE);
3083 if (bp->b_iocmd == BIO_READ)
3084 cr = bp->b_rcred;
3085 else
3086 cr = bp->b_wcred;
3087
3088 /*
3089 * If the op is asynchronous and an i/o daemon is waiting
3090 * queue the request, wake it up and wait for completion
3091 * otherwise just do it ourselves.
3092 */
3093 if ((bp->b_flags & B_ASYNC) == 0 ||
3094 ncl_asyncio(VFSTONFS(vp->v_mount), bp, NOCRED, curthread))
3095 (void) ncl_doio(vp, bp, cr, curthread, 1);
3096 return (0);
3097 }
3098
3099 /*
3100 * fsync vnode op. Just call ncl_flush() with commit == 1.
3101 */
3102 /* ARGSUSED */
3103 static int
nfs_fsync(struct vop_fsync_args * ap)3104 nfs_fsync(struct vop_fsync_args *ap)
3105 {
3106
3107 if (ap->a_vp->v_type != VREG) {
3108 /*
3109 * For NFS, metadata is changed synchronously on the server,
3110 * so there is nothing to flush. Also, ncl_flush() clears
3111 * the NMODIFIED flag and that shouldn't be done here for
3112 * directories.
3113 */
3114 return (0);
3115 }
3116 return (ncl_flush(ap->a_vp, ap->a_waitfor, ap->a_td, 1, 0));
3117 }
3118
3119 /*
3120 * Flush all the blocks associated with a vnode.
3121 * Walk through the buffer pool and push any dirty pages
3122 * associated with the vnode.
3123 * If the called_from_renewthread argument is TRUE, it has been called
3124 * from the NFSv4 renew thread and, as such, cannot block indefinitely
3125 * waiting for a buffer write to complete.
3126 */
3127 int
ncl_flush(struct vnode * vp,int waitfor,struct thread * td,int commit,int called_from_renewthread)3128 ncl_flush(struct vnode *vp, int waitfor, struct thread *td,
3129 int commit, int called_from_renewthread)
3130 {
3131 struct nfsnode *np = VTONFS(vp);
3132 struct buf *bp;
3133 int i;
3134 struct buf *nbp;
3135 struct nfsmount *nmp = VFSTONFS(vp->v_mount);
3136 int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos;
3137 int passone = 1, trycnt = 0;
3138 u_quad_t off, endoff, toff;
3139 struct ucred* wcred = NULL;
3140 struct buf **bvec = NULL;
3141 struct bufobj *bo;
3142 #ifndef NFS_COMMITBVECSIZ
3143 #define NFS_COMMITBVECSIZ 20
3144 #endif
3145 struct buf *bvec_on_stack[NFS_COMMITBVECSIZ];
3146 u_int bvecsize = 0, bveccount;
3147 struct timespec ts;
3148
3149 if (called_from_renewthread != 0)
3150 slptimeo = hz;
3151 if (nmp->nm_flag & NFSMNT_INT)
3152 slpflag = PCATCH;
3153 if (!commit)
3154 passone = 0;
3155 bo = &vp->v_bufobj;
3156 /*
3157 * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the
3158 * server, but has not been committed to stable storage on the server
3159 * yet. On the first pass, the byte range is worked out and the commit
3160 * rpc is done. On the second pass, bwrite() is called to do the
3161 * job.
3162 */
3163 again:
3164 off = (u_quad_t)-1;
3165 endoff = 0;
3166 bvecpos = 0;
3167 if (NFS_ISV34(vp) && commit) {
3168 if (bvec != NULL && bvec != bvec_on_stack)
3169 free(bvec, M_TEMP);
3170 /*
3171 * Count up how many buffers waiting for a commit.
3172 */
3173 bveccount = 0;
3174 BO_LOCK(bo);
3175 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
3176 if (!BUF_ISLOCKED(bp) &&
3177 (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT))
3178 == (B_DELWRI | B_NEEDCOMMIT))
3179 bveccount++;
3180 }
3181 /*
3182 * Allocate space to remember the list of bufs to commit. It is
3183 * important to use M_NOWAIT here to avoid a race with nfs_write.
3184 * If we can't get memory (for whatever reason), we will end up
3185 * committing the buffers one-by-one in the loop below.
3186 */
3187 if (bveccount > NFS_COMMITBVECSIZ) {
3188 /*
3189 * Release the vnode interlock to avoid a lock
3190 * order reversal.
3191 */
3192 BO_UNLOCK(bo);
3193 bvec = (struct buf **)
3194 malloc(bveccount * sizeof(struct buf *),
3195 M_TEMP, M_NOWAIT);
3196 BO_LOCK(bo);
3197 if (bvec == NULL) {
3198 bvec = bvec_on_stack;
3199 bvecsize = NFS_COMMITBVECSIZ;
3200 } else
3201 bvecsize = bveccount;
3202 } else {
3203 bvec = bvec_on_stack;
3204 bvecsize = NFS_COMMITBVECSIZ;
3205 }
3206 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
3207 if (bvecpos >= bvecsize)
3208 break;
3209 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
3210 nbp = TAILQ_NEXT(bp, b_bobufs);
3211 continue;
3212 }
3213 if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) !=
3214 (B_DELWRI | B_NEEDCOMMIT)) {
3215 BUF_UNLOCK(bp);
3216 nbp = TAILQ_NEXT(bp, b_bobufs);
3217 continue;
3218 }
3219 BO_UNLOCK(bo);
3220 bremfree(bp);
3221 /*
3222 * Work out if all buffers are using the same cred
3223 * so we can deal with them all with one commit.
3224 *
3225 * NOTE: we are not clearing B_DONE here, so we have
3226 * to do it later on in this routine if we intend to
3227 * initiate I/O on the bp.
3228 *
3229 * Note: to avoid loopback deadlocks, we do not
3230 * assign b_runningbufspace.
3231 */
3232 if (wcred == NULL)
3233 wcred = bp->b_wcred;
3234 else if (wcred != bp->b_wcred)
3235 wcred = NOCRED;
3236 vfs_busy_pages(bp, 0);
3237
3238 BO_LOCK(bo);
3239 /*
3240 * bp is protected by being locked, but nbp is not
3241 * and vfs_busy_pages() may sleep. We have to
3242 * recalculate nbp.
3243 */
3244 nbp = TAILQ_NEXT(bp, b_bobufs);
3245
3246 /*
3247 * A list of these buffers is kept so that the
3248 * second loop knows which buffers have actually
3249 * been committed. This is necessary, since there
3250 * may be a race between the commit rpc and new
3251 * uncommitted writes on the file.
3252 */
3253 bvec[bvecpos++] = bp;
3254 toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
3255 bp->b_dirtyoff;
3256 if (toff < off)
3257 off = toff;
3258 toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff);
3259 if (toff > endoff)
3260 endoff = toff;
3261 }
3262 BO_UNLOCK(bo);
3263 }
3264 if (bvecpos > 0) {
3265 /*
3266 * Commit data on the server, as required.
3267 * If all bufs are using the same wcred, then use that with
3268 * one call for all of them, otherwise commit each one
3269 * separately.
3270 */
3271 if (wcred != NOCRED)
3272 retv = ncl_commit(vp, off, (int)(endoff - off),
3273 wcred, td);
3274 else {
3275 retv = 0;
3276 for (i = 0; i < bvecpos; i++) {
3277 off_t off, size;
3278 bp = bvec[i];
3279 off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE +
3280 bp->b_dirtyoff;
3281 size = (u_quad_t)(bp->b_dirtyend
3282 - bp->b_dirtyoff);
3283 retv = ncl_commit(vp, off, (int)size,
3284 bp->b_wcred, td);
3285 if (retv) break;
3286 }
3287 }
3288
3289 if (retv == NFSERR_STALEWRITEVERF)
3290 ncl_clearcommit(vp->v_mount);
3291
3292 /*
3293 * Now, either mark the blocks I/O done or mark the
3294 * blocks dirty, depending on whether the commit
3295 * succeeded.
3296 */
3297 for (i = 0; i < bvecpos; i++) {
3298 bp = bvec[i];
3299 bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
3300 if (!NFSCL_FORCEDISM(vp->v_mount) && retv) {
3301 /*
3302 * Error, leave B_DELWRI intact
3303 */
3304 vfs_unbusy_pages(bp);
3305 brelse(bp);
3306 } else {
3307 /*
3308 * Success, remove B_DELWRI ( bundirty() ).
3309 *
3310 * b_dirtyoff/b_dirtyend seem to be NFS
3311 * specific. We should probably move that
3312 * into bundirty(). XXX
3313 */
3314 bufobj_wref(bo);
3315 bp->b_flags |= B_ASYNC;
3316 bundirty(bp);
3317 bp->b_flags &= ~B_DONE;
3318 bp->b_ioflags &= ~BIO_ERROR;
3319 bp->b_dirtyoff = bp->b_dirtyend = 0;
3320 bufdone(bp);
3321 }
3322 }
3323 }
3324
3325 /*
3326 * Start/do any write(s) that are required.
3327 */
3328 loop:
3329 BO_LOCK(bo);
3330 TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) {
3331 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) {
3332 if (waitfor != MNT_WAIT || passone)
3333 continue;
3334
3335 error = BUF_TIMELOCK(bp,
3336 LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK,
3337 BO_LOCKPTR(bo), "nfsfsync", slpflag, slptimeo);
3338 if (error == 0) {
3339 BUF_UNLOCK(bp);
3340 goto loop;
3341 }
3342 if (error == ENOLCK) {
3343 error = 0;
3344 goto loop;
3345 }
3346 if (called_from_renewthread != 0) {
3347 /*
3348 * Return EIO so the flush will be retried
3349 * later.
3350 */
3351 error = EIO;
3352 goto done;
3353 }
3354 if (newnfs_sigintr(nmp, td)) {
3355 error = EINTR;
3356 goto done;
3357 }
3358 if (slpflag == PCATCH) {
3359 slpflag = 0;
3360 slptimeo = 2 * hz;
3361 }
3362 goto loop;
3363 }
3364 if ((bp->b_flags & B_DELWRI) == 0)
3365 panic("nfs_fsync: not dirty");
3366 if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) {
3367 BUF_UNLOCK(bp);
3368 continue;
3369 }
3370 BO_UNLOCK(bo);
3371 bremfree(bp);
3372 bp->b_flags |= B_ASYNC;
3373 bwrite(bp);
3374 if (newnfs_sigintr(nmp, td)) {
3375 error = EINTR;
3376 goto done;
3377 }
3378 goto loop;
3379 }
3380 if (passone) {
3381 passone = 0;
3382 BO_UNLOCK(bo);
3383 goto again;
3384 }
3385 if (waitfor == MNT_WAIT) {
3386 while (bo->bo_numoutput) {
3387 error = bufobj_wwait(bo, slpflag, slptimeo);
3388 if (error) {
3389 BO_UNLOCK(bo);
3390 if (called_from_renewthread != 0) {
3391 /*
3392 * Return EIO so that the flush will be
3393 * retried later.
3394 */
3395 error = EIO;
3396 goto done;
3397 }
3398 error = newnfs_sigintr(nmp, td);
3399 if (error)
3400 goto done;
3401 if (slpflag == PCATCH) {
3402 slpflag = 0;
3403 slptimeo = 2 * hz;
3404 }
3405 BO_LOCK(bo);
3406 }
3407 }
3408 if (bo->bo_dirty.bv_cnt != 0 && commit) {
3409 BO_UNLOCK(bo);
3410 goto loop;
3411 }
3412 /*
3413 * Wait for all the async IO requests to drain
3414 */
3415 BO_UNLOCK(bo);
3416 } else
3417 BO_UNLOCK(bo);
3418 if (NFSHASPNFS(nmp)) {
3419 nfscl_layoutcommit(vp, td);
3420 /*
3421 * Invalidate the attribute cache, since writes to a DS
3422 * won't update the size attribute.
3423 */
3424 NFSLOCKNODE(np);
3425 np->n_attrstamp = 0;
3426 } else
3427 NFSLOCKNODE(np);
3428 if (np->n_flag & NWRITEERR) {
3429 error = np->n_error;
3430 np->n_flag &= ~NWRITEERR;
3431 }
3432 if (commit && bo->bo_dirty.bv_cnt == 0 &&
3433 bo->bo_numoutput == 0)
3434 np->n_flag &= ~NMODIFIED;
3435 NFSUNLOCKNODE(np);
3436 done:
3437 if (bvec != NULL && bvec != bvec_on_stack)
3438 free(bvec, M_TEMP);
3439 if (error == 0 && commit != 0 && waitfor == MNT_WAIT &&
3440 (bo->bo_dirty.bv_cnt != 0 || bo->bo_numoutput != 0)) {
3441 if (trycnt++ < 5) {
3442 /* try, try again... */
3443 passone = 1;
3444 wcred = NULL;
3445 bvec = NULL;
3446 bvecsize = 0;
3447 goto again;
3448 }
3449 vn_printf(vp, "ncl_flush failed");
3450 error = called_from_renewthread != 0 ? EIO : EBUSY;
3451 }
3452 if (error == 0) {
3453 nanouptime(&ts);
3454 NFSLOCKNODE(np);
3455 np->n_localmodtime = ts;
3456 NFSUNLOCKNODE(np);
3457 }
3458 return (error);
3459 }
3460
3461 /*
3462 * NFS advisory byte-level locks.
3463 */
3464 static int
nfs_advlock(struct vop_advlock_args * ap)3465 nfs_advlock(struct vop_advlock_args *ap)
3466 {
3467 struct vnode *vp = ap->a_vp;
3468 struct ucred *cred;
3469 struct nfsnode *np = VTONFS(ap->a_vp);
3470 struct proc *p = (struct proc *)ap->a_id;
3471 struct thread *td = curthread; /* XXX */
3472 struct vattr va;
3473 int ret, error;
3474 u_quad_t size;
3475 struct nfsmount *nmp;
3476
3477 error = NFSVOPLOCK(vp, LK_SHARED);
3478 if (error != 0)
3479 return (EBADF);
3480 nmp = VFSTONFS(vp->v_mount);
3481 if (!NFS_ISV4(vp) || (nmp->nm_flag & NFSMNT_NOLOCKD) != 0) {
3482 if ((nmp->nm_flag & NFSMNT_NOLOCKD) != 0) {
3483 size = np->n_size;
3484 NFSVOPUNLOCK(vp);
3485 error = lf_advlock(ap, &(vp->v_lockf), size);
3486 } else {
3487 if (nfs_advlock_p != NULL)
3488 error = nfs_advlock_p(ap);
3489 else {
3490 NFSVOPUNLOCK(vp);
3491 error = ENOLCK;
3492 }
3493 }
3494 if (error == 0 && ap->a_op == F_SETLK) {
3495 error = NFSVOPLOCK(vp, LK_SHARED);
3496 if (error == 0) {
3497 /* Mark that a file lock has been acquired. */
3498 NFSLOCKNODE(np);
3499 np->n_flag |= NHASBEENLOCKED;
3500 NFSUNLOCKNODE(np);
3501 NFSVOPUNLOCK(vp);
3502 }
3503 }
3504 return (error);
3505 } else if ((ap->a_flags & (F_POSIX | F_FLOCK)) != 0) {
3506 if (vp->v_type != VREG) {
3507 error = EINVAL;
3508 goto out;
3509 }
3510 if ((ap->a_flags & F_POSIX) != 0)
3511 cred = p->p_ucred;
3512 else
3513 cred = td->td_ucred;
3514 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
3515 if (VN_IS_DOOMED(vp)) {
3516 error = EBADF;
3517 goto out;
3518 }
3519
3520 /*
3521 * If this is unlocking a write locked region, flush and
3522 * commit them before unlocking. This is required by
3523 * RFC3530 Sec. 9.3.2.
3524 */
3525 if (ap->a_op == F_UNLCK &&
3526 nfscl_checkwritelocked(vp, ap->a_fl, cred, td, ap->a_id,
3527 ap->a_flags))
3528 (void) ncl_flush(vp, MNT_WAIT, td, 1, 0);
3529
3530 /*
3531 * Mark NFS node as might have acquired a lock.
3532 * This is separate from NHASBEENLOCKED, because it must
3533 * be done before the nfsrpc_advlock() call, which might
3534 * add a nfscllock structure to the client state.
3535 * It is used to check for the case where a nfscllock
3536 * state structure cannot exist for the file.
3537 * Only done for "oneopenown" NFSv4.1/4.2 mounts.
3538 */
3539 if (NFSHASNFSV4N(nmp) && NFSHASONEOPENOWN(nmp)) {
3540 NFSLOCKNODE(np);
3541 np->n_flag |= NMIGHTBELOCKED;
3542 NFSUNLOCKNODE(np);
3543 }
3544
3545 /*
3546 * Loop around doing the lock op, while a blocking lock
3547 * must wait for the lock op to succeed.
3548 */
3549 do {
3550 ret = nfsrpc_advlock(vp, np->n_size, ap->a_op,
3551 ap->a_fl, 0, cred, td, ap->a_id, ap->a_flags);
3552 if (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
3553 ap->a_op == F_SETLK) {
3554 NFSVOPUNLOCK(vp);
3555 error = nfs_catnap(PZERO | PCATCH, ret,
3556 "ncladvl");
3557 if (error)
3558 return (EINTR);
3559 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
3560 if (VN_IS_DOOMED(vp)) {
3561 error = EBADF;
3562 goto out;
3563 }
3564 }
3565 } while (ret == NFSERR_DENIED && (ap->a_flags & F_WAIT) &&
3566 ap->a_op == F_SETLK);
3567 if (ret == NFSERR_DENIED) {
3568 error = EAGAIN;
3569 goto out;
3570 } else if (ret == EINVAL || ret == EBADF || ret == EINTR) {
3571 error = ret;
3572 goto out;
3573 } else if (ret != 0) {
3574 error = EACCES;
3575 goto out;
3576 }
3577
3578 /*
3579 * Now, if we just got a lock, invalidate data in the buffer
3580 * cache, as required, so that the coherency conforms with
3581 * RFC3530 Sec. 9.3.2.
3582 */
3583 if (ap->a_op == F_SETLK) {
3584 if ((np->n_flag & NMODIFIED) == 0) {
3585 np->n_attrstamp = 0;
3586 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
3587 ret = VOP_GETATTR(vp, &va, cred);
3588 }
3589 if ((np->n_flag & NMODIFIED) || ret ||
3590 np->n_change != va.va_filerev) {
3591 (void) ncl_vinvalbuf(vp, V_SAVE, td, 1);
3592 np->n_attrstamp = 0;
3593 KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp);
3594 ret = VOP_GETATTR(vp, &va, cred);
3595 if (!ret) {
3596 np->n_mtime = va.va_mtime;
3597 np->n_change = va.va_filerev;
3598 }
3599 }
3600 /* Mark that a file lock has been acquired. */
3601 NFSLOCKNODE(np);
3602 np->n_flag |= NHASBEENLOCKED;
3603 NFSUNLOCKNODE(np);
3604 }
3605 } else
3606 error = EOPNOTSUPP;
3607 out:
3608 NFSVOPUNLOCK(vp);
3609 return (error);
3610 }
3611
3612 /*
3613 * NFS advisory byte-level locks.
3614 */
3615 static int
nfs_advlockasync(struct vop_advlockasync_args * ap)3616 nfs_advlockasync(struct vop_advlockasync_args *ap)
3617 {
3618 struct vnode *vp = ap->a_vp;
3619 u_quad_t size;
3620 int error;
3621
3622 error = NFSVOPLOCK(vp, LK_SHARED);
3623 if (error)
3624 return (error);
3625 if (NFS_ISV4(vp)) {
3626 NFSVOPUNLOCK(vp);
3627 return (EOPNOTSUPP);
3628 }
3629 if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) {
3630 size = VTONFS(vp)->n_size;
3631 NFSVOPUNLOCK(vp);
3632 error = lf_advlockasync(ap, &(vp->v_lockf), size);
3633 } else {
3634 NFSVOPUNLOCK(vp);
3635 error = EOPNOTSUPP;
3636 }
3637 return (error);
3638 }
3639
3640 /*
3641 * Print out the contents of an nfsnode.
3642 */
3643 static int
nfs_print(struct vop_print_args * ap)3644 nfs_print(struct vop_print_args *ap)
3645 {
3646 struct vnode *vp = ap->a_vp;
3647 struct nfsnode *np = VTONFS(vp);
3648
3649 printf("\tfileid %jd fsid 0x%jx", (uintmax_t)np->n_vattr.na_fileid,
3650 (uintmax_t)np->n_vattr.na_fsid);
3651 if (vp->v_type == VFIFO)
3652 fifo_printinfo(vp);
3653 printf("\n");
3654 return (0);
3655 }
3656
3657 /*
3658 * nfs special file access vnode op.
3659 * Essentially just get vattr and then imitate iaccess() since the device is
3660 * local to the client.
3661 */
3662 static int
nfsspec_access(struct vop_access_args * ap)3663 nfsspec_access(struct vop_access_args *ap)
3664 {
3665 struct vattr *vap;
3666 struct ucred *cred = ap->a_cred;
3667 struct vnode *vp = ap->a_vp;
3668 accmode_t accmode = ap->a_accmode;
3669 struct vattr vattr;
3670 int error;
3671
3672 /*
3673 * Disallow write attempts on filesystems mounted read-only;
3674 * unless the file is a socket, fifo, or a block or character
3675 * device resident on the filesystem.
3676 */
3677 if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) {
3678 switch (vp->v_type) {
3679 case VREG:
3680 case VDIR:
3681 case VLNK:
3682 return (EROFS);
3683 default:
3684 break;
3685 }
3686 }
3687 vap = &vattr;
3688 error = VOP_GETATTR(vp, vap, cred);
3689 if (error)
3690 goto out;
3691 error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid,
3692 accmode, cred);
3693 out:
3694 return error;
3695 }
3696
3697 /*
3698 * Read wrapper for fifos.
3699 */
3700 static int
nfsfifo_read(struct vop_read_args * ap)3701 nfsfifo_read(struct vop_read_args *ap)
3702 {
3703 struct nfsnode *np = VTONFS(ap->a_vp);
3704 int error;
3705
3706 /*
3707 * Set access flag.
3708 */
3709 NFSLOCKNODE(np);
3710 np->n_flag |= NACC;
3711 vfs_timestamp(&np->n_atim);
3712 NFSUNLOCKNODE(np);
3713 error = fifo_specops.vop_read(ap);
3714 return error;
3715 }
3716
3717 /*
3718 * Write wrapper for fifos.
3719 */
3720 static int
nfsfifo_write(struct vop_write_args * ap)3721 nfsfifo_write(struct vop_write_args *ap)
3722 {
3723 struct nfsnode *np = VTONFS(ap->a_vp);
3724
3725 /*
3726 * Set update flag.
3727 */
3728 NFSLOCKNODE(np);
3729 np->n_flag |= NUPD;
3730 vfs_timestamp(&np->n_mtim);
3731 NFSUNLOCKNODE(np);
3732 return(fifo_specops.vop_write(ap));
3733 }
3734
3735 /*
3736 * Close wrapper for fifos.
3737 *
3738 * Update the times on the nfsnode then do fifo close.
3739 */
3740 static int
nfsfifo_close(struct vop_close_args * ap)3741 nfsfifo_close(struct vop_close_args *ap)
3742 {
3743 struct vnode *vp = ap->a_vp;
3744 struct nfsnode *np = VTONFS(vp);
3745 struct vattr vattr;
3746 struct timespec ts;
3747
3748 NFSLOCKNODE(np);
3749 if (np->n_flag & (NACC | NUPD)) {
3750 vfs_timestamp(&ts);
3751 if (np->n_flag & NACC)
3752 np->n_atim = ts;
3753 if (np->n_flag & NUPD)
3754 np->n_mtim = ts;
3755 np->n_flag |= NCHG;
3756 if (vrefcnt(vp) == 1 &&
3757 (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
3758 VATTR_NULL(&vattr);
3759 if (np->n_flag & NACC)
3760 vattr.va_atime = np->n_atim;
3761 if (np->n_flag & NUPD)
3762 vattr.va_mtime = np->n_mtim;
3763 NFSUNLOCKNODE(np);
3764 (void)VOP_SETATTR(vp, &vattr, ap->a_cred);
3765 goto out;
3766 }
3767 }
3768 NFSUNLOCKNODE(np);
3769 out:
3770 return (fifo_specops.vop_close(ap));
3771 }
3772
3773 static int
nfs_getacl(struct vop_getacl_args * ap)3774 nfs_getacl(struct vop_getacl_args *ap)
3775 {
3776 int error;
3777
3778 if (ap->a_type != ACL_TYPE_NFS4)
3779 return (EOPNOTSUPP);
3780 error = nfsrpc_getacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp);
3781 if (error > NFSERR_STALE) {
3782 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
3783 error = EPERM;
3784 }
3785 return (error);
3786 }
3787
3788 static int
nfs_setacl(struct vop_setacl_args * ap)3789 nfs_setacl(struct vop_setacl_args *ap)
3790 {
3791 int error;
3792
3793 if (ap->a_type != ACL_TYPE_NFS4)
3794 return (EOPNOTSUPP);
3795 error = nfsrpc_setacl(ap->a_vp, ap->a_cred, ap->a_td, ap->a_aclp);
3796 if (error > NFSERR_STALE) {
3797 (void) nfscl_maperr(ap->a_td, error, (uid_t)0, (gid_t)0);
3798 error = EPERM;
3799 }
3800 return (error);
3801 }
3802
3803 /*
3804 * VOP_ADVISE for NFS.
3805 * Just return 0 for any errors, since it is just a hint.
3806 */
3807 static int
nfs_advise(struct vop_advise_args * ap)3808 nfs_advise(struct vop_advise_args *ap)
3809 {
3810 struct thread *td = curthread;
3811 struct nfsmount *nmp;
3812 uint64_t len;
3813 int error;
3814
3815 /*
3816 * First do vop_stdadvise() to handle the buffer cache.
3817 */
3818 error = vop_stdadvise(ap);
3819 if (error != 0)
3820 return (error);
3821 if (ap->a_start < 0 || ap->a_end < 0)
3822 return (0);
3823 if (ap->a_end == OFF_MAX)
3824 len = 0;
3825 else if (ap->a_end < ap->a_start)
3826 return (0);
3827 else
3828 len = ap->a_end - ap->a_start + 1;
3829 nmp = VFSTONFS(ap->a_vp->v_mount);
3830 mtx_lock(&nmp->nm_mtx);
3831 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
3832 (NFSHASPNFS(nmp) && (nmp->nm_privflag & NFSMNTP_IOADVISETHRUMDS) ==
3833 0) || (nmp->nm_privflag & NFSMNTP_NOADVISE) != 0) {
3834 mtx_unlock(&nmp->nm_mtx);
3835 return (0);
3836 }
3837 mtx_unlock(&nmp->nm_mtx);
3838 error = nfsrpc_advise(ap->a_vp, ap->a_start, len, ap->a_advice,
3839 td->td_ucred, td);
3840 if (error == NFSERR_NOTSUPP) {
3841 mtx_lock(&nmp->nm_mtx);
3842 nmp->nm_privflag |= NFSMNTP_NOADVISE;
3843 mtx_unlock(&nmp->nm_mtx);
3844 }
3845 return (0);
3846 }
3847
3848 /*
3849 * nfs allocate call
3850 */
3851 static int
nfs_allocate(struct vop_allocate_args * ap)3852 nfs_allocate(struct vop_allocate_args *ap)
3853 {
3854 struct vnode *vp = ap->a_vp;
3855 struct thread *td = curthread;
3856 struct nfsvattr nfsva;
3857 struct nfsmount *nmp;
3858 struct nfsnode *np;
3859 off_t alen;
3860 int attrflag, error, ret;
3861 struct timespec ts;
3862 struct uio io;
3863
3864 attrflag = 0;
3865 nmp = VFSTONFS(vp->v_mount);
3866 np = VTONFS(vp);
3867 mtx_lock(&nmp->nm_mtx);
3868 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION &&
3869 (nmp->nm_privflag & NFSMNTP_NOALLOCATE) == 0) {
3870 mtx_unlock(&nmp->nm_mtx);
3871 alen = *ap->a_len;
3872 if ((uint64_t)alen > nfs_maxalloclen)
3873 alen = nfs_maxalloclen;
3874
3875 /* Check the file size limit. */
3876 io.uio_offset = *ap->a_offset;
3877 io.uio_resid = alen;
3878 error = vn_rlimit_fsize(vp, &io, td);
3879
3880 /*
3881 * Flush first to ensure that the allocate adds to the
3882 * file's allocation on the server.
3883 */
3884 if (error == 0) {
3885 vnode_pager_clean_sync(vp);
3886 error = ncl_flush(vp, MNT_WAIT, td, 1, 0);
3887 }
3888 if (error == 0)
3889 error = nfsrpc_allocate(vp, *ap->a_offset, alen,
3890 &nfsva, &attrflag, ap->a_cred, td);
3891 if (error == 0) {
3892 *ap->a_offset += alen;
3893 *ap->a_len -= alen;
3894 nanouptime(&ts);
3895 NFSLOCKNODE(np);
3896 np->n_localmodtime = ts;
3897 NFSUNLOCKNODE(np);
3898 } else if (error == NFSERR_NOTSUPP) {
3899 mtx_lock(&nmp->nm_mtx);
3900 nmp->nm_privflag |= NFSMNTP_NOALLOCATE;
3901 mtx_unlock(&nmp->nm_mtx);
3902 error = EINVAL;
3903 }
3904 } else {
3905 mtx_unlock(&nmp->nm_mtx);
3906 error = EINVAL;
3907 }
3908 if (attrflag != 0) {
3909 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
3910 if (error == 0 && ret != 0)
3911 error = ret;
3912 }
3913 if (error != 0)
3914 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
3915 return (error);
3916 }
3917
3918 /*
3919 * nfs deallocate call
3920 */
3921 static int
nfs_deallocate(struct vop_deallocate_args * ap)3922 nfs_deallocate(struct vop_deallocate_args *ap)
3923 {
3924 struct vnode *vp = ap->a_vp;
3925 struct thread *td = curthread;
3926 struct nfsvattr nfsva;
3927 struct nfsmount *nmp;
3928 struct nfsnode *np;
3929 off_t tlen, mlen;
3930 int attrflag, error, ret;
3931 bool clipped;
3932 struct timespec ts;
3933
3934 error = 0;
3935 attrflag = 0;
3936 nmp = VFSTONFS(vp->v_mount);
3937 np = VTONFS(vp);
3938 mtx_lock(&nmp->nm_mtx);
3939 if (NFSHASNFSV4(nmp) && nmp->nm_minorvers >= NFSV42_MINORVERSION &&
3940 (nmp->nm_privflag & NFSMNTP_NODEALLOCATE) == 0) {
3941 mtx_unlock(&nmp->nm_mtx);
3942 tlen = omin(OFF_MAX - *ap->a_offset, *ap->a_len);
3943 NFSCL_DEBUG(4, "dealloc: off=%jd len=%jd maxfilesize=%ju\n",
3944 (intmax_t)*ap->a_offset, (intmax_t)tlen,
3945 (uintmax_t)nmp->nm_maxfilesize);
3946 if ((uint64_t)*ap->a_offset >= nmp->nm_maxfilesize) {
3947 /* Avoid EFBIG error return from the NFSv4.2 server. */
3948 *ap->a_len = 0;
3949 return (0);
3950 }
3951 clipped = false;
3952 if ((uint64_t)*ap->a_offset + tlen > nmp->nm_maxfilesize)
3953 tlen = nmp->nm_maxfilesize - *ap->a_offset;
3954 if ((uint64_t)*ap->a_offset < np->n_size) {
3955 /* Limit the len to nfs_maxalloclen before EOF. */
3956 mlen = omin((off_t)np->n_size - *ap->a_offset, tlen);
3957 if ((uint64_t)mlen > nfs_maxalloclen) {
3958 NFSCL_DEBUG(4, "dealloc: tlen maxalloclen\n");
3959 tlen = nfs_maxalloclen;
3960 clipped = true;
3961 }
3962 }
3963 if (error == 0)
3964 error = ncl_vinvalbuf(vp, V_SAVE, td, 1);
3965 if (error == 0) {
3966 vnode_pager_purge_range(vp, *ap->a_offset,
3967 *ap->a_offset + tlen);
3968 error = nfsrpc_deallocate(vp, *ap->a_offset, tlen,
3969 &nfsva, &attrflag, ap->a_cred, td);
3970 NFSCL_DEBUG(4, "dealloc: rpc=%d\n", error);
3971 }
3972 if (error == 0) {
3973 NFSCL_DEBUG(4, "dealloc: attrflag=%d na_size=%ju\n",
3974 attrflag, (uintmax_t)nfsva.na_size);
3975 nanouptime(&ts);
3976 NFSLOCKNODE(np);
3977 np->n_localmodtime = ts;
3978 NFSUNLOCKNODE(np);
3979 if (attrflag != 0) {
3980 if ((uint64_t)*ap->a_offset < nfsva.na_size)
3981 *ap->a_offset += omin((off_t)
3982 nfsva.na_size - *ap->a_offset,
3983 tlen);
3984 }
3985 if (clipped && tlen < *ap->a_len)
3986 *ap->a_len -= tlen;
3987 else
3988 *ap->a_len = 0;
3989 } else if (error == NFSERR_NOTSUPP) {
3990 mtx_lock(&nmp->nm_mtx);
3991 nmp->nm_privflag |= NFSMNTP_NODEALLOCATE;
3992 mtx_unlock(&nmp->nm_mtx);
3993 }
3994 } else {
3995 mtx_unlock(&nmp->nm_mtx);
3996 error = EIO;
3997 }
3998 /*
3999 * If the NFS server cannot perform the Deallocate operation, just call
4000 * vop_stddeallocate() to perform it.
4001 */
4002 if (error != 0 && error != NFSERR_FBIG && error != NFSERR_INVAL) {
4003 error = vop_stddeallocate(ap);
4004 NFSCL_DEBUG(4, "dealloc: stddeallocate=%d\n", error);
4005 }
4006 if (attrflag != 0) {
4007 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4008 if (error == 0 && ret != 0)
4009 error = ret;
4010 }
4011 if (error != 0)
4012 error = nfscl_maperr(td, error, (uid_t)0, (gid_t)0);
4013 return (error);
4014 }
4015
4016 /*
4017 * nfs copy_file_range call
4018 */
4019 static int
nfs_copy_file_range(struct vop_copy_file_range_args * ap)4020 nfs_copy_file_range(struct vop_copy_file_range_args *ap)
4021 {
4022 struct vnode *invp = ap->a_invp;
4023 struct vnode *outvp = ap->a_outvp;
4024 struct mount *mp;
4025 vm_object_t invp_obj;
4026 struct nfsvattr innfsva, outnfsva;
4027 struct vattr va, *vap;
4028 struct uio io;
4029 struct nfsmount *nmp;
4030 size_t len, len2;
4031 ssize_t r;
4032 int error, inattrflag, outattrflag, ret, ret2, invp_lock;
4033 off_t inoff, outoff;
4034 bool consecutive, must_commit, tryoutcred;
4035
4036 /*
4037 * NFSv4.2 Copy is not permitted for infile == outfile.
4038 * TODO: copy_file_range() between multiple NFS mountpoints
4039 */
4040 if (invp == outvp || invp->v_mount != outvp->v_mount) {
4041 generic_copy:
4042 return (ENOSYS);
4043 }
4044
4045 invp_lock = LK_SHARED;
4046 relock:
4047
4048 /* Lock both vnodes, avoiding risk of deadlock. */
4049 do {
4050 mp = NULL;
4051 error = vn_start_write(outvp, &mp, V_WAIT);
4052 if (error == 0) {
4053 error = vn_lock(outvp, LK_EXCLUSIVE);
4054 if (error == 0) {
4055 error = vn_lock(invp, invp_lock | LK_NOWAIT);
4056 if (error == 0)
4057 break;
4058 VOP_UNLOCK(outvp);
4059 if (mp != NULL)
4060 vn_finished_write(mp);
4061 mp = NULL;
4062 error = vn_lock(invp, invp_lock);
4063 if (error == 0)
4064 VOP_UNLOCK(invp);
4065 }
4066 }
4067 if (mp != NULL)
4068 vn_finished_write(mp);
4069 } while (error == 0);
4070 if (error != 0)
4071 return (error);
4072
4073 /*
4074 * More reasons to avoid nfs copy: not NFSv4.2, or explicitly
4075 * disabled.
4076 */
4077 nmp = VFSTONFS(invp->v_mount);
4078 mtx_lock(&nmp->nm_mtx);
4079 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4080 (nmp->nm_privflag & NFSMNTP_NOCOPY) != 0) {
4081 mtx_unlock(&nmp->nm_mtx);
4082 VOP_UNLOCK(invp);
4083 VOP_UNLOCK(outvp);
4084 if (mp != NULL)
4085 vn_finished_write(mp);
4086 goto generic_copy;
4087 }
4088 mtx_unlock(&nmp->nm_mtx);
4089
4090 /*
4091 * Do the vn_rlimit_fsize() check. Should this be above the VOP layer?
4092 */
4093 io.uio_offset = *ap->a_outoffp;
4094 io.uio_resid = *ap->a_lenp;
4095 error = vn_rlimit_fsizex(outvp, &io, 0, &r, ap->a_fsizetd);
4096 *ap->a_lenp = io.uio_resid;
4097 /*
4098 * No need to call vn_rlimit_fsizex_res before return, since the uio is
4099 * local.
4100 */
4101
4102 /*
4103 * Flush the input file so that the data is up to date before
4104 * the copy. Flush writes for the output file so that they
4105 * do not overwrite the data copied to the output file by the Copy.
4106 * Set the commit argument for both flushes so that the data is on
4107 * stable storage before the Copy RPC. This is done in case the
4108 * server reboots during the Copy and needs to be redone.
4109 */
4110 if (error == 0) {
4111 invp_obj = invp->v_object;
4112 if (invp_obj != NULL && vm_object_mightbedirty(invp_obj)) {
4113 if (invp_lock != LK_EXCLUSIVE) {
4114 invp_lock = LK_EXCLUSIVE;
4115 VOP_UNLOCK(invp);
4116 VOP_UNLOCK(outvp);
4117 if (mp != NULL)
4118 vn_finished_write(mp);
4119 goto relock;
4120 }
4121 vnode_pager_clean_sync(invp);
4122 }
4123 error = ncl_flush(invp, MNT_WAIT, curthread, 1, 0);
4124 }
4125 if (error == 0)
4126 error = ncl_vinvalbuf(outvp, V_SAVE, curthread, 0);
4127
4128 /* Do the actual NFSv4.2 RPC. */
4129 ret = ret2 = 0;
4130 len = *ap->a_lenp;
4131 mtx_lock(&nmp->nm_mtx);
4132 if ((nmp->nm_privflag & NFSMNTP_NOCONSECUTIVE) == 0)
4133 consecutive = true;
4134 else
4135 consecutive = false;
4136 mtx_unlock(&nmp->nm_mtx);
4137 inoff = *ap->a_inoffp;
4138 outoff = *ap->a_outoffp;
4139 tryoutcred = true;
4140 must_commit = false;
4141 if (error == 0) {
4142 vap = &VTONFS(invp)->n_vattr.na_vattr;
4143 error = VOP_GETATTR(invp, vap, ap->a_incred);
4144 if (error == 0) {
4145 /*
4146 * Clip "len" at va_size so that RFC compliant servers
4147 * will not reply NFSERR_INVAL.
4148 * Setting "len == 0" for the RPC would be preferred,
4149 * but some Linux servers do not support that.
4150 * If the len is being set to 0, do a Setattr RPC to
4151 * set the server's atime. This behaviour was the
4152 * preferred one for the FreeBSD "collective".
4153 */
4154 if (inoff >= vap->va_size) {
4155 *ap->a_lenp = len = 0;
4156 if ((nmp->nm_mountp->mnt_flag & MNT_NOATIME) ==
4157 0) {
4158 VATTR_NULL(&va);
4159 va.va_atime.tv_sec = 0;
4160 va.va_atime.tv_nsec = 0;
4161 va.va_vaflags = VA_UTIMES_NULL;
4162 inattrflag = 0;
4163 error = nfsrpc_setattr(invp, &va, NULL,
4164 ap->a_incred, curthread, &innfsva,
4165 &inattrflag);
4166 if (inattrflag != 0)
4167 ret = nfscl_loadattrcache(&invp,
4168 &innfsva, NULL, 0, 1);
4169 if (error == 0 && ret != 0)
4170 error = ret;
4171 }
4172 } else if (inoff + len > vap->va_size)
4173 *ap->a_lenp = len = vap->va_size - inoff;
4174 } else
4175 error = 0;
4176 }
4177
4178 /*
4179 * len will be set to 0 upon a successful Copy RPC.
4180 * As such, this only loops when the Copy RPC needs to be retried.
4181 */
4182 while (len > 0 && error == 0) {
4183 inattrflag = outattrflag = 0;
4184 len2 = len;
4185 if (tryoutcred)
4186 error = nfsrpc_copy_file_range(invp, ap->a_inoffp,
4187 outvp, ap->a_outoffp, &len2, ap->a_flags,
4188 &inattrflag, &innfsva, &outattrflag, &outnfsva,
4189 ap->a_outcred, consecutive, &must_commit);
4190 else
4191 error = nfsrpc_copy_file_range(invp, ap->a_inoffp,
4192 outvp, ap->a_outoffp, &len2, ap->a_flags,
4193 &inattrflag, &innfsva, &outattrflag, &outnfsva,
4194 ap->a_incred, consecutive, &must_commit);
4195 if (inattrflag != 0)
4196 ret = nfscl_loadattrcache(&invp, &innfsva, NULL, 0, 1);
4197 if (outattrflag != 0)
4198 ret2 = nfscl_loadattrcache(&outvp, &outnfsva, NULL,
4199 1, 1);
4200 if (error == 0) {
4201 if (consecutive == false) {
4202 if (len2 == len) {
4203 mtx_lock(&nmp->nm_mtx);
4204 nmp->nm_privflag |=
4205 NFSMNTP_NOCONSECUTIVE;
4206 mtx_unlock(&nmp->nm_mtx);
4207 } else
4208 error = NFSERR_OFFLOADNOREQS;
4209 }
4210 *ap->a_lenp = len2;
4211 len = 0;
4212 if (len2 > 0 && must_commit && error == 0)
4213 error = ncl_commit(outvp, outoff, *ap->a_lenp,
4214 ap->a_outcred, curthread);
4215 if (error == 0 && ret != 0)
4216 error = ret;
4217 if (error == 0 && ret2 != 0)
4218 error = ret2;
4219 } else if (error == NFSERR_OFFLOADNOREQS && consecutive) {
4220 /*
4221 * Try consecutive == false, which is ok only if all
4222 * bytes are copied.
4223 * If only some bytes were copied when consecutive
4224 * is false, there is no way to know which bytes
4225 * still need to be written.
4226 */
4227 consecutive = false;
4228 error = 0;
4229 } else if (error == NFSERR_ACCES && tryoutcred) {
4230 /* Try again with incred. */
4231 tryoutcred = false;
4232 error = 0;
4233 }
4234 if (error == NFSERR_STALEWRITEVERF) {
4235 /*
4236 * Server rebooted, so do it all again.
4237 */
4238 *ap->a_inoffp = inoff;
4239 *ap->a_outoffp = outoff;
4240 len = *ap->a_lenp;
4241 must_commit = false;
4242 error = 0;
4243 }
4244 }
4245 VOP_UNLOCK(invp);
4246 VOP_UNLOCK(outvp);
4247 if (mp != NULL)
4248 vn_finished_write(mp);
4249 if (error == NFSERR_NOTSUPP || error == NFSERR_OFFLOADNOREQS ||
4250 error == NFSERR_ACCES) {
4251 /*
4252 * Unlike the NFSv4.2 Copy, vn_generic_copy_file_range() can
4253 * use a_incred for the read and a_outcred for the write, so
4254 * try this for NFSERR_ACCES failures for the Copy.
4255 * For NFSERR_NOTSUPP and NFSERR_OFFLOADNOREQS, the Copy can
4256 * never succeed, so disable it.
4257 */
4258 if (error != NFSERR_ACCES) {
4259 /* Can never do Copy on this mount. */
4260 mtx_lock(&nmp->nm_mtx);
4261 nmp->nm_privflag |= NFSMNTP_NOCOPY;
4262 mtx_unlock(&nmp->nm_mtx);
4263 }
4264 *ap->a_inoffp = inoff;
4265 *ap->a_outoffp = outoff;
4266 error = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp,
4267 ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags,
4268 ap->a_incred, ap->a_outcred, ap->a_fsizetd);
4269 } else if (error != 0)
4270 *ap->a_lenp = 0;
4271
4272 if (error != 0)
4273 error = nfscl_maperr(curthread, error, (uid_t)0, (gid_t)0);
4274 return (error);
4275 }
4276
4277 /*
4278 * nfs ioctl call
4279 */
4280 static int
nfs_ioctl(struct vop_ioctl_args * ap)4281 nfs_ioctl(struct vop_ioctl_args *ap)
4282 {
4283 struct vnode *vp = ap->a_vp;
4284 struct nfsvattr nfsva;
4285 struct nfsmount *nmp;
4286 int attrflag, content, error, ret;
4287 bool eof = false; /* shut up compiler. */
4288
4289 /* Do the actual NFSv4.2 RPC. */
4290 switch (ap->a_command) {
4291 case FIOSEEKDATA:
4292 content = NFSV4CONTENT_DATA;
4293 break;
4294 case FIOSEEKHOLE:
4295 content = NFSV4CONTENT_HOLE;
4296 break;
4297 default:
4298 return (ENOTTY);
4299 }
4300
4301 error = vn_lock(vp, LK_EXCLUSIVE);
4302 if (error != 0)
4303 return (EBADF);
4304
4305 if (vp->v_type != VREG) {
4306 VOP_UNLOCK(vp);
4307 return (ENOTTY);
4308 }
4309 nmp = VFSTONFS(vp->v_mount);
4310 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION) {
4311 VOP_UNLOCK(vp);
4312 error = vop_stdioctl(ap);
4313 return (error);
4314 }
4315
4316 attrflag = 0;
4317 if (*((off_t *)ap->a_data) >= VTONFS(vp)->n_size)
4318 error = ENXIO;
4319 else {
4320 /*
4321 * Flush all writes, so that the server is up to date.
4322 * Although a Commit is not required, the commit argument
4323 * is set so that, for a pNFS File/Flexible File Layout
4324 * server, the LayoutCommit will be done to ensure the file
4325 * size is up to date on the Metadata Server.
4326 */
4327
4328 vnode_pager_clean_sync(vp);
4329 error = ncl_flush(vp, MNT_WAIT, ap->a_td, 1, 0);
4330 if (error == 0)
4331 error = nfsrpc_seek(vp, (off_t *)ap->a_data, &eof,
4332 content, ap->a_cred, &nfsva, &attrflag);
4333 /* If at eof for FIOSEEKDATA, return ENXIO. */
4334 if (eof && error == 0 && content == NFSV4CONTENT_DATA)
4335 error = ENXIO;
4336 }
4337 if (attrflag != 0) {
4338 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4339 if (error == 0 && ret != 0)
4340 error = ret;
4341 }
4342 NFSVOPUNLOCK(vp);
4343
4344 if (error != 0)
4345 error = ENXIO;
4346 return (error);
4347 }
4348
4349 /*
4350 * nfs getextattr call
4351 */
4352 static int
nfs_getextattr(struct vop_getextattr_args * ap)4353 nfs_getextattr(struct vop_getextattr_args *ap)
4354 {
4355 struct vnode *vp = ap->a_vp;
4356 struct nfsmount *nmp;
4357 struct ucred *cred;
4358 struct thread *td = ap->a_td;
4359 struct nfsvattr nfsva;
4360 ssize_t len;
4361 int attrflag, error, ret;
4362
4363 nmp = VFSTONFS(vp->v_mount);
4364 mtx_lock(&nmp->nm_mtx);
4365 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4366 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4367 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4368 mtx_unlock(&nmp->nm_mtx);
4369 return (EOPNOTSUPP);
4370 }
4371 mtx_unlock(&nmp->nm_mtx);
4372
4373 cred = ap->a_cred;
4374 if (cred == NULL)
4375 cred = td->td_ucred;
4376 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
4377 attrflag = 0;
4378 error = nfsrpc_getextattr(vp, ap->a_name, ap->a_uio, &len, &nfsva,
4379 &attrflag, cred, td);
4380 if (attrflag != 0) {
4381 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4382 if (error == 0 && ret != 0)
4383 error = ret;
4384 }
4385 if (error == 0 && ap->a_size != NULL)
4386 *ap->a_size = len;
4387
4388 switch (error) {
4389 case NFSERR_NOTSUPP:
4390 case NFSERR_OPILLEGAL:
4391 mtx_lock(&nmp->nm_mtx);
4392 nmp->nm_privflag |= NFSMNTP_NOXATTR;
4393 mtx_unlock(&nmp->nm_mtx);
4394 error = EOPNOTSUPP;
4395 break;
4396 case NFSERR_NOXATTR:
4397 case NFSERR_XATTR2BIG:
4398 error = ENOATTR;
4399 break;
4400 default:
4401 error = nfscl_maperr(td, error, 0, 0);
4402 break;
4403 }
4404 return (error);
4405 }
4406
4407 /*
4408 * nfs setextattr call
4409 */
4410 static int
nfs_setextattr(struct vop_setextattr_args * ap)4411 nfs_setextattr(struct vop_setextattr_args *ap)
4412 {
4413 struct vnode *vp = ap->a_vp;
4414 struct nfsmount *nmp;
4415 struct ucred *cred;
4416 struct thread *td = ap->a_td;
4417 struct nfsvattr nfsva;
4418 int attrflag, error, ret;
4419
4420 nmp = VFSTONFS(vp->v_mount);
4421 mtx_lock(&nmp->nm_mtx);
4422 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4423 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4424 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4425 mtx_unlock(&nmp->nm_mtx);
4426 return (EOPNOTSUPP);
4427 }
4428 mtx_unlock(&nmp->nm_mtx);
4429
4430 if (ap->a_uio->uio_resid < 0)
4431 return (EINVAL);
4432 cred = ap->a_cred;
4433 if (cred == NULL)
4434 cred = td->td_ucred;
4435 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
4436 attrflag = 0;
4437 error = nfsrpc_setextattr(vp, ap->a_name, ap->a_uio, &nfsva,
4438 &attrflag, cred, td);
4439 if (attrflag != 0) {
4440 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4441 if (error == 0 && ret != 0)
4442 error = ret;
4443 }
4444
4445 switch (error) {
4446 case NFSERR_NOTSUPP:
4447 case NFSERR_OPILLEGAL:
4448 mtx_lock(&nmp->nm_mtx);
4449 nmp->nm_privflag |= NFSMNTP_NOXATTR;
4450 mtx_unlock(&nmp->nm_mtx);
4451 error = EOPNOTSUPP;
4452 break;
4453 case NFSERR_NOXATTR:
4454 case NFSERR_XATTR2BIG:
4455 error = ENOATTR;
4456 break;
4457 default:
4458 error = nfscl_maperr(td, error, 0, 0);
4459 break;
4460 }
4461 return (error);
4462 }
4463
4464 /*
4465 * nfs listextattr call
4466 */
4467 static int
nfs_listextattr(struct vop_listextattr_args * ap)4468 nfs_listextattr(struct vop_listextattr_args *ap)
4469 {
4470 struct vnode *vp = ap->a_vp;
4471 struct nfsmount *nmp;
4472 struct ucred *cred;
4473 struct thread *td = ap->a_td;
4474 struct nfsvattr nfsva;
4475 size_t len, len2;
4476 uint64_t cookie;
4477 int attrflag, error, ret;
4478 bool eof;
4479
4480 nmp = VFSTONFS(vp->v_mount);
4481 mtx_lock(&nmp->nm_mtx);
4482 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4483 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4484 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4485 mtx_unlock(&nmp->nm_mtx);
4486 return (EOPNOTSUPP);
4487 }
4488 mtx_unlock(&nmp->nm_mtx);
4489
4490 cred = ap->a_cred;
4491 if (cred == NULL)
4492 cred = td->td_ucred;
4493
4494 /* Loop around doing List Extended Attribute RPCs. */
4495 eof = false;
4496 cookie = 0;
4497 len2 = 0;
4498 error = 0;
4499 while (!eof && error == 0) {
4500 len = nmp->nm_rsize;
4501 attrflag = 0;
4502 error = nfsrpc_listextattr(vp, &cookie, ap->a_uio, &len, &eof,
4503 &nfsva, &attrflag, cred, td);
4504 if (attrflag != 0) {
4505 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4506 if (error == 0 && ret != 0)
4507 error = ret;
4508 }
4509 if (error == 0) {
4510 len2 += len;
4511 if (len2 > SSIZE_MAX)
4512 error = ENOATTR;
4513 }
4514 }
4515 if (error == 0 && ap->a_size != NULL)
4516 *ap->a_size = len2;
4517
4518 switch (error) {
4519 case NFSERR_NOTSUPP:
4520 case NFSERR_OPILLEGAL:
4521 mtx_lock(&nmp->nm_mtx);
4522 nmp->nm_privflag |= NFSMNTP_NOXATTR;
4523 mtx_unlock(&nmp->nm_mtx);
4524 error = EOPNOTSUPP;
4525 break;
4526 case NFSERR_NOXATTR:
4527 case NFSERR_XATTR2BIG:
4528 error = ENOATTR;
4529 break;
4530 default:
4531 error = nfscl_maperr(td, error, 0, 0);
4532 break;
4533 }
4534 return (error);
4535 }
4536
4537 /*
4538 * nfs setextattr call
4539 */
4540 static int
nfs_deleteextattr(struct vop_deleteextattr_args * ap)4541 nfs_deleteextattr(struct vop_deleteextattr_args *ap)
4542 {
4543 struct vnode *vp = ap->a_vp;
4544 struct nfsmount *nmp;
4545 struct nfsvattr nfsva;
4546 int attrflag, error, ret;
4547
4548 nmp = VFSTONFS(vp->v_mount);
4549 mtx_lock(&nmp->nm_mtx);
4550 if (!NFSHASNFSV4(nmp) || nmp->nm_minorvers < NFSV42_MINORVERSION ||
4551 (nmp->nm_privflag & NFSMNTP_NOXATTR) != 0 ||
4552 ap->a_attrnamespace != EXTATTR_NAMESPACE_USER) {
4553 mtx_unlock(&nmp->nm_mtx);
4554 return (EOPNOTSUPP);
4555 }
4556 mtx_unlock(&nmp->nm_mtx);
4557
4558 /* Do the actual NFSv4.2 Optional Extended Attribute (RFC-8276) RPC. */
4559 attrflag = 0;
4560 error = nfsrpc_rmextattr(vp, ap->a_name, &nfsva, &attrflag, ap->a_cred,
4561 ap->a_td);
4562 if (attrflag != 0) {
4563 ret = nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4564 if (error == 0 && ret != 0)
4565 error = ret;
4566 }
4567
4568 switch (error) {
4569 case NFSERR_NOTSUPP:
4570 case NFSERR_OPILLEGAL:
4571 mtx_lock(&nmp->nm_mtx);
4572 nmp->nm_privflag |= NFSMNTP_NOXATTR;
4573 mtx_unlock(&nmp->nm_mtx);
4574 error = EOPNOTSUPP;
4575 break;
4576 case NFSERR_NOXATTR:
4577 case NFSERR_XATTR2BIG:
4578 error = ENOATTR;
4579 break;
4580 default:
4581 error = nfscl_maperr(ap->a_td, error, 0, 0);
4582 break;
4583 }
4584 return (error);
4585 }
4586
4587 /*
4588 * Return POSIX pathconf information applicable to nfs filesystems.
4589 */
4590 static int
nfs_pathconf(struct vop_pathconf_args * ap)4591 nfs_pathconf(struct vop_pathconf_args *ap)
4592 {
4593 struct nfsv3_pathconf pc;
4594 struct nfsvattr nfsva;
4595 struct vnode *vp = ap->a_vp;
4596 struct nfsmount *nmp;
4597 struct thread *td = curthread;
4598 off_t off;
4599 bool eof, has_namedattr, named_enabled;
4600 int attrflag, error;
4601 struct nfsnode *np;
4602
4603 nmp = VFSTONFS(vp->v_mount);
4604 np = VTONFS(vp);
4605 named_enabled = false;
4606 has_namedattr = false;
4607 if ((NFS_ISV34(vp) && (ap->a_name == _PC_LINK_MAX ||
4608 ap->a_name == _PC_NAME_MAX || ap->a_name == _PC_CHOWN_RESTRICTED ||
4609 ap->a_name == _PC_NO_TRUNC)) ||
4610 (NFS_ISV4(vp) && (ap->a_name == _PC_ACL_NFS4 ||
4611 ap->a_name == _PC_HAS_NAMEDATTR))) {
4612 /*
4613 * Since only the above 4 a_names are returned by the NFSv3
4614 * Pathconf RPC, there is no point in doing it for others.
4615 * For NFSv4, the Pathconf RPC (actually a Getattr Op.) can
4616 * be used for _PC_ACL_NFS4 and _PC_HAS_NAMEDATTR as well.
4617 */
4618 error = nfsrpc_pathconf(vp, &pc, &has_namedattr, td->td_ucred,
4619 td, &nfsva, &attrflag);
4620 if (attrflag != 0)
4621 (void) nfscl_loadattrcache(&vp, &nfsva, NULL, 0, 1);
4622 if (error != 0)
4623 return (error);
4624 } else if (NFS_ISV4(vp) && ap->a_name == _PC_NAMEDATTR_ENABLED &&
4625 (np->n_flag & NNAMEDNOTSUPP) == 0) {
4626 struct nfsfh *nfhp;
4627
4628 error = nfsrpc_openattr(nmp, vp, np->n_fhp->nfh_fh,
4629 np->n_fhp->nfh_len, false, td->td_ucred, td, &nfsva, &nfhp,
4630 &attrflag);
4631 named_enabled = true;
4632 if (error == 0) {
4633 free(nfhp, M_NFSFH);
4634 } else if (error == NFSERR_NOTSUPP) {
4635 named_enabled = false;
4636 NFSLOCKNODE(np);
4637 np->n_flag |= NNAMEDNOTSUPP;
4638 NFSUNLOCKNODE(np);
4639 }
4640 error = 0;
4641 } else {
4642 /*
4643 * For NFSv2 (or NFSv3 when not one of the above 4 a_names),
4644 * just fake them.
4645 */
4646 pc.pc_linkmax = NFS_LINK_MAX;
4647 pc.pc_namemax = NFS_MAXNAMLEN;
4648 pc.pc_notrunc = 1;
4649 pc.pc_chownrestricted = 1;
4650 pc.pc_caseinsensitive = 0;
4651 pc.pc_casepreserving = 1;
4652 error = 0;
4653 }
4654 switch (ap->a_name) {
4655 case _PC_LINK_MAX:
4656 #ifdef _LP64
4657 *ap->a_retval = pc.pc_linkmax;
4658 #else
4659 *ap->a_retval = MIN(LONG_MAX, pc.pc_linkmax);
4660 #endif
4661 break;
4662 case _PC_NAME_MAX:
4663 *ap->a_retval = pc.pc_namemax;
4664 break;
4665 case _PC_PIPE_BUF:
4666 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO)
4667 *ap->a_retval = PIPE_BUF;
4668 else
4669 error = EINVAL;
4670 break;
4671 case _PC_CHOWN_RESTRICTED:
4672 *ap->a_retval = pc.pc_chownrestricted;
4673 break;
4674 case _PC_NO_TRUNC:
4675 *ap->a_retval = pc.pc_notrunc;
4676 break;
4677 case _PC_ACL_NFS4:
4678 if (NFS_ISV4(vp) && nfsrv_useacl != 0 && attrflag != 0 &&
4679 NFSISSET_ATTRBIT(&nfsva.na_suppattr, NFSATTRBIT_ACL))
4680 *ap->a_retval = 1;
4681 else
4682 *ap->a_retval = 0;
4683 break;
4684 case _PC_ACL_PATH_MAX:
4685 if (NFS_ISV4(vp))
4686 *ap->a_retval = ACL_MAX_ENTRIES;
4687 else
4688 *ap->a_retval = 3;
4689 break;
4690 case _PC_PRIO_IO:
4691 *ap->a_retval = 0;
4692 break;
4693 case _PC_SYNC_IO:
4694 *ap->a_retval = 0;
4695 break;
4696 case _PC_ALLOC_SIZE_MIN:
4697 *ap->a_retval = vp->v_mount->mnt_stat.f_bsize;
4698 break;
4699 case _PC_FILESIZEBITS:
4700 if (NFS_ISV34(vp))
4701 *ap->a_retval = 64;
4702 else
4703 *ap->a_retval = 32;
4704 break;
4705 case _PC_REC_INCR_XFER_SIZE:
4706 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
4707 break;
4708 case _PC_REC_MAX_XFER_SIZE:
4709 *ap->a_retval = -1; /* means ``unlimited'' */
4710 break;
4711 case _PC_REC_MIN_XFER_SIZE:
4712 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
4713 break;
4714 case _PC_REC_XFER_ALIGN:
4715 *ap->a_retval = PAGE_SIZE;
4716 break;
4717 case _PC_SYMLINK_MAX:
4718 *ap->a_retval = NFS_MAXPATHLEN;
4719 break;
4720 case _PC_MIN_HOLE_SIZE:
4721 /* Only some NFSv4.2 servers support Seek for Holes. */
4722 *ap->a_retval = 0;
4723 if (NFS_ISV4(vp) && nmp->nm_minorvers == NFSV42_MINORVERSION) {
4724 /*
4725 * NFSv4.2 doesn't have an attribute for hole size,
4726 * so all we can do is see if the Seek operation is
4727 * supported and then use f_iosize as a "best guess".
4728 */
4729 mtx_lock(&nmp->nm_mtx);
4730 if ((nmp->nm_privflag & NFSMNTP_SEEKTESTED) == 0) {
4731 mtx_unlock(&nmp->nm_mtx);
4732 off = 0;
4733 attrflag = 0;
4734 error = nfsrpc_seek(vp, &off, &eof,
4735 NFSV4CONTENT_HOLE, td->td_ucred, &nfsva,
4736 &attrflag);
4737 if (attrflag != 0)
4738 (void) nfscl_loadattrcache(&vp, &nfsva,
4739 NULL, 0, 1);
4740 mtx_lock(&nmp->nm_mtx);
4741 if (error == NFSERR_NOTSUPP)
4742 nmp->nm_privflag |= NFSMNTP_SEEKTESTED;
4743 else
4744 nmp->nm_privflag |= NFSMNTP_SEEKTESTED |
4745 NFSMNTP_SEEK;
4746 error = 0;
4747 }
4748 if ((nmp->nm_privflag & NFSMNTP_SEEK) != 0)
4749 *ap->a_retval = vp->v_mount->mnt_stat.f_iosize;
4750 mtx_unlock(&nmp->nm_mtx);
4751 }
4752 break;
4753 case _PC_NAMEDATTR_ENABLED:
4754 if (named_enabled)
4755 *ap->a_retval = 1;
4756 else
4757 *ap->a_retval = 0;
4758 break;
4759 case _PC_HAS_NAMEDATTR:
4760 if (has_namedattr)
4761 *ap->a_retval = 1;
4762 else
4763 *ap->a_retval = 0;
4764 break;
4765 case _PC_HAS_HIDDENSYSTEM:
4766 if (NFS_ISV4(vp) && NFSISSET_ATTRBIT(&np->n_vattr.na_suppattr,
4767 NFSATTRBIT_HIDDEN) &&
4768 NFSISSET_ATTRBIT(&np->n_vattr.na_suppattr,
4769 NFSATTRBIT_SYSTEM))
4770 *ap->a_retval = 1;
4771 else
4772 *ap->a_retval = 0;
4773 break;
4774
4775 default:
4776 error = vop_stdpathconf(ap);
4777 break;
4778 }
4779 return (error);
4780 }
4781