1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/nfs/inode.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * nfs inode and superblock handling functions
8 *
9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
10 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 *
12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
13 * J.S.Peatfield@damtp.cam.ac.uk
14 *
15 */
16
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/sched/signal.h>
20 #include <linux/time.h>
21 #include <linux/kernel.h>
22 #include <linux/mm.h>
23 #include <linux/string.h>
24 #include <linux/stat.h>
25 #include <linux/errno.h>
26 #include <linux/unistd.h>
27 #include <linux/sunrpc/clnt.h>
28 #include <linux/sunrpc/stats.h>
29 #include <linux/sunrpc/metrics.h>
30 #include <linux/nfs_fs.h>
31 #include <linux/nfs_mount.h>
32 #include <linux/nfs4_mount.h>
33 #include <linux/lockd/bind.h>
34 #include <linux/seq_file.h>
35 #include <linux/mount.h>
36 #include <linux/vfs.h>
37 #include <linux/inet.h>
38 #include <linux/nfs_xdr.h>
39 #include <linux/slab.h>
40 #include <linux/compat.h>
41 #include <linux/freezer.h>
42 #include <linux/uaccess.h>
43 #include <linux/iversion.h>
44
45 #include "nfs4_fs.h"
46 #include "callback.h"
47 #include "delegation.h"
48 #include "iostat.h"
49 #include "internal.h"
50 #include "fscache.h"
51 #include "pnfs.h"
52 #include "nfs.h"
53 #include "netns.h"
54 #include "sysfs.h"
55
56 #include "nfstrace.h"
57
58 #define NFSDBG_FACILITY NFSDBG_VFS
59
60 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
61
62 /* Default is to see 64-bit inode numbers */
63 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
64
65 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
66
67 static struct kmem_cache * nfs_inode_cachep;
68
69 static inline unsigned long
nfs_fattr_to_ino_t(struct nfs_fattr * fattr)70 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
71 {
72 return nfs_fileid_to_ino_t(fattr->fileid);
73 }
74
nfs_wait_bit_killable(struct wait_bit_key * key,int mode)75 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
76 {
77 schedule();
78 if (signal_pending_state(mode, current))
79 return -ERESTARTSYS;
80 return 0;
81 }
82 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
83
84 /**
85 * nfs_compat_user_ino64 - returns the user-visible inode number
86 * @fileid: 64-bit fileid
87 *
88 * This function returns a 32-bit inode number if the boot parameter
89 * nfs.enable_ino64 is zero.
90 */
nfs_compat_user_ino64(u64 fileid)91 u64 nfs_compat_user_ino64(u64 fileid)
92 {
93 #ifdef CONFIG_COMPAT
94 compat_ulong_t ino;
95 #else
96 unsigned long ino;
97 #endif
98
99 if (enable_ino64)
100 return fileid;
101 ino = fileid;
102 if (sizeof(ino) < sizeof(fileid))
103 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
104 return ino;
105 }
106
nfs_drop_inode(struct inode * inode)107 int nfs_drop_inode(struct inode *inode)
108 {
109 return NFS_STALE(inode) || generic_drop_inode(inode);
110 }
111 EXPORT_SYMBOL_GPL(nfs_drop_inode);
112
nfs_clear_inode(struct inode * inode)113 void nfs_clear_inode(struct inode *inode)
114 {
115 /*
116 * The following should never happen...
117 */
118 WARN_ON_ONCE(nfs_have_writebacks(inode));
119 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
120 nfs_zap_acl_cache(inode);
121 nfs_access_zap_cache(inode);
122 nfs_fscache_clear_inode(inode);
123 }
124 EXPORT_SYMBOL_GPL(nfs_clear_inode);
125
nfs_evict_inode(struct inode * inode)126 void nfs_evict_inode(struct inode *inode)
127 {
128 truncate_inode_pages_final(&inode->i_data);
129 clear_inode(inode);
130 nfs_clear_inode(inode);
131 }
132
nfs_sync_inode(struct inode * inode)133 int nfs_sync_inode(struct inode *inode)
134 {
135 inode_dio_wait(inode);
136 return nfs_wb_all(inode);
137 }
138 EXPORT_SYMBOL_GPL(nfs_sync_inode);
139
140 /**
141 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
142 * @mapping: pointer to struct address_space
143 */
nfs_sync_mapping(struct address_space * mapping)144 int nfs_sync_mapping(struct address_space *mapping)
145 {
146 int ret = 0;
147
148 if (mapping->nrpages != 0) {
149 unmap_mapping_range(mapping, 0, 0, 0);
150 ret = nfs_wb_all(mapping->host);
151 }
152 return ret;
153 }
154
nfs_attribute_timeout(struct inode * inode)155 static int nfs_attribute_timeout(struct inode *inode)
156 {
157 struct nfs_inode *nfsi = NFS_I(inode);
158
159 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
160 }
161
nfs_check_cache_flags_invalid(struct inode * inode,unsigned long flags)162 static bool nfs_check_cache_flags_invalid(struct inode *inode,
163 unsigned long flags)
164 {
165 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
166
167 return (cache_validity & flags) != 0;
168 }
169
nfs_check_cache_invalid(struct inode * inode,unsigned long flags)170 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
171 {
172 if (nfs_check_cache_flags_invalid(inode, flags))
173 return true;
174 return nfs_attribute_cache_expired(inode);
175 }
176 EXPORT_SYMBOL_GPL(nfs_check_cache_invalid);
177
178 #ifdef CONFIG_NFS_V4_2
nfs_has_xattr_cache(const struct nfs_inode * nfsi)179 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
180 {
181 return nfsi->xattr_cache != NULL;
182 }
183 #else
nfs_has_xattr_cache(const struct nfs_inode * nfsi)184 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
185 {
186 return false;
187 }
188 #endif
189
nfs_set_cache_invalid(struct inode * inode,unsigned long flags)190 void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
191 {
192 struct nfs_inode *nfsi = NFS_I(inode);
193
194 if (nfs_have_delegated_attributes(inode)) {
195 if (!(flags & NFS_INO_REVAL_FORCED))
196 flags &= ~(NFS_INO_INVALID_MODE |
197 NFS_INO_INVALID_OTHER |
198 NFS_INO_INVALID_XATTR);
199 flags &= ~(NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
200 }
201
202 if (!nfs_has_xattr_cache(nfsi))
203 flags &= ~NFS_INO_INVALID_XATTR;
204 if (flags & NFS_INO_INVALID_DATA)
205 nfs_fscache_invalidate(inode, 0);
206 flags &= ~NFS_INO_REVAL_FORCED;
207
208 nfsi->cache_validity |= flags;
209
210 if (inode->i_mapping->nrpages == 0) {
211 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
212 nfs_ooo_clear(nfsi);
213 } else if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
214 nfs_ooo_clear(nfsi);
215 }
216 trace_nfs_set_cache_invalid(inode, 0);
217 }
218 EXPORT_SYMBOL_GPL(nfs_set_cache_invalid);
219
220 /*
221 * Invalidate the local caches
222 */
nfs_zap_caches_locked(struct inode * inode)223 static void nfs_zap_caches_locked(struct inode *inode)
224 {
225 struct nfs_inode *nfsi = NFS_I(inode);
226 int mode = inode->i_mode;
227
228 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
229
230 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
231 nfsi->attrtimeo_timestamp = jiffies;
232
233 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
234 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
235 NFS_INO_INVALID_DATA |
236 NFS_INO_INVALID_ACCESS |
237 NFS_INO_INVALID_ACL |
238 NFS_INO_INVALID_XATTR);
239 else
240 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
241 NFS_INO_INVALID_ACCESS |
242 NFS_INO_INVALID_ACL |
243 NFS_INO_INVALID_XATTR);
244 nfs_zap_label_cache_locked(nfsi);
245 }
246
nfs_zap_caches(struct inode * inode)247 void nfs_zap_caches(struct inode *inode)
248 {
249 spin_lock(&inode->i_lock);
250 nfs_zap_caches_locked(inode);
251 spin_unlock(&inode->i_lock);
252 }
253
nfs_zap_mapping(struct inode * inode,struct address_space * mapping)254 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
255 {
256 if (mapping->nrpages != 0) {
257 spin_lock(&inode->i_lock);
258 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
259 spin_unlock(&inode->i_lock);
260 }
261 }
262
nfs_zap_acl_cache(struct inode * inode)263 void nfs_zap_acl_cache(struct inode *inode)
264 {
265 void (*clear_acl_cache)(struct inode *);
266
267 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
268 if (clear_acl_cache != NULL)
269 clear_acl_cache(inode);
270 spin_lock(&inode->i_lock);
271 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
272 spin_unlock(&inode->i_lock);
273 }
274 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
275
nfs_invalidate_atime(struct inode * inode)276 void nfs_invalidate_atime(struct inode *inode)
277 {
278 if (nfs_have_delegated_atime(inode))
279 return;
280 spin_lock(&inode->i_lock);
281 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
282 spin_unlock(&inode->i_lock);
283 }
284 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
285
286 /*
287 * Invalidate, but do not unhash, the inode.
288 * NB: must be called with inode->i_lock held!
289 */
nfs_set_inode_stale_locked(struct inode * inode)290 static void nfs_set_inode_stale_locked(struct inode *inode)
291 {
292 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
293 nfs_zap_caches_locked(inode);
294 trace_nfs_set_inode_stale(inode);
295 }
296
nfs_set_inode_stale(struct inode * inode)297 void nfs_set_inode_stale(struct inode *inode)
298 {
299 spin_lock(&inode->i_lock);
300 nfs_set_inode_stale_locked(inode);
301 spin_unlock(&inode->i_lock);
302 }
303
304 struct nfs_find_desc {
305 struct nfs_fh *fh;
306 struct nfs_fattr *fattr;
307 };
308
309 /*
310 * In NFSv3 we can have 64bit inode numbers. In order to support
311 * this, and re-exported directories (also seen in NFSv2)
312 * we are forced to allow 2 different inodes to have the same
313 * i_ino.
314 */
315 static int
nfs_find_actor(struct inode * inode,void * opaque)316 nfs_find_actor(struct inode *inode, void *opaque)
317 {
318 struct nfs_find_desc *desc = opaque;
319 struct nfs_fh *fh = desc->fh;
320 struct nfs_fattr *fattr = desc->fattr;
321
322 if (NFS_FILEID(inode) != fattr->fileid)
323 return 0;
324 if (inode_wrong_type(inode, fattr->mode))
325 return 0;
326 if (nfs_compare_fh(NFS_FH(inode), fh))
327 return 0;
328 if (is_bad_inode(inode) || NFS_STALE(inode))
329 return 0;
330 return 1;
331 }
332
333 static int
nfs_init_locked(struct inode * inode,void * opaque)334 nfs_init_locked(struct inode *inode, void *opaque)
335 {
336 struct nfs_find_desc *desc = opaque;
337 struct nfs_fattr *fattr = desc->fattr;
338
339 set_nfs_fileid(inode, fattr->fileid);
340 inode->i_mode = fattr->mode;
341 nfs_copy_fh(NFS_FH(inode), desc->fh);
342 return 0;
343 }
344
345 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
nfs_clear_label_invalid(struct inode * inode)346 static void nfs_clear_label_invalid(struct inode *inode)
347 {
348 spin_lock(&inode->i_lock);
349 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
350 spin_unlock(&inode->i_lock);
351 }
352
nfs_setsecurity(struct inode * inode,struct nfs_fattr * fattr)353 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr)
354 {
355 int error;
356
357 if (fattr->label == NULL)
358 return;
359
360 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
361 error = security_inode_notifysecctx(inode, fattr->label->label,
362 fattr->label->len);
363 if (error)
364 printk(KERN_ERR "%s() %s %d "
365 "security_inode_notifysecctx() %d\n",
366 __func__,
367 (char *)fattr->label->label,
368 fattr->label->len, error);
369 nfs_clear_label_invalid(inode);
370 }
371 }
372
nfs4_label_alloc(struct nfs_server * server,gfp_t flags)373 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
374 {
375 struct nfs4_label *label;
376
377 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
378 return NULL;
379
380 label = kzalloc(sizeof(struct nfs4_label), flags);
381 if (label == NULL)
382 return ERR_PTR(-ENOMEM);
383
384 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
385 if (label->label == NULL) {
386 kfree(label);
387 return ERR_PTR(-ENOMEM);
388 }
389 label->len = NFS4_MAXLABELLEN;
390
391 return label;
392 }
393 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
394 #else
nfs_setsecurity(struct inode * inode,struct nfs_fattr * fattr)395 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr)
396 {
397 }
398 #endif
399 EXPORT_SYMBOL_GPL(nfs_setsecurity);
400
401 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
402 struct inode *
nfs_ilookup(struct super_block * sb,struct nfs_fattr * fattr,struct nfs_fh * fh)403 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
404 {
405 struct nfs_find_desc desc = {
406 .fh = fh,
407 .fattr = fattr,
408 };
409 struct inode *inode;
410 unsigned long hash;
411
412 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
413 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
414 return NULL;
415
416 hash = nfs_fattr_to_ino_t(fattr);
417 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
418
419 dprintk("%s: returning %p\n", __func__, inode);
420 return inode;
421 }
422
nfs_inode_init_regular(struct nfs_inode * nfsi)423 static void nfs_inode_init_regular(struct nfs_inode *nfsi)
424 {
425 atomic_long_set(&nfsi->nrequests, 0);
426 atomic_long_set(&nfsi->redirtied_pages, 0);
427 INIT_LIST_HEAD(&nfsi->commit_info.list);
428 atomic_long_set(&nfsi->commit_info.ncommit, 0);
429 atomic_set(&nfsi->commit_info.rpcs_out, 0);
430 mutex_init(&nfsi->commit_mutex);
431 }
432
nfs_inode_init_dir(struct nfs_inode * nfsi)433 static void nfs_inode_init_dir(struct nfs_inode *nfsi)
434 {
435 nfsi->cache_change_attribute = 0;
436 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
437 init_rwsem(&nfsi->rmdir_sem);
438 }
439
440 /*
441 * This is our front-end to iget that looks up inodes by file handle
442 * instead of inode number.
443 */
444 struct inode *
nfs_fhget(struct super_block * sb,struct nfs_fh * fh,struct nfs_fattr * fattr)445 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
446 {
447 struct nfs_find_desc desc = {
448 .fh = fh,
449 .fattr = fattr
450 };
451 struct inode *inode = ERR_PTR(-ENOENT);
452 u64 fattr_supported = NFS_SB(sb)->fattr_valid;
453 unsigned long hash;
454
455 nfs_attr_check_mountpoint(sb, fattr);
456
457 if (nfs_attr_use_mounted_on_fileid(fattr))
458 fattr->fileid = fattr->mounted_on_fileid;
459 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
460 goto out_no_inode;
461 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
462 goto out_no_inode;
463
464 hash = nfs_fattr_to_ino_t(fattr);
465
466 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
467 if (inode == NULL) {
468 inode = ERR_PTR(-ENOMEM);
469 goto out_no_inode;
470 }
471
472 if (inode->i_state & I_NEW) {
473 struct nfs_inode *nfsi = NFS_I(inode);
474 unsigned long now = jiffies;
475
476 /* We set i_ino for the few things that still rely on it,
477 * such as stat(2) */
478 inode->i_ino = hash;
479
480 /* We can't support update_atime(), since the server will reset it */
481 inode->i_flags |= S_NOATIME|S_NOCMTIME;
482 inode->i_mode = fattr->mode;
483 nfsi->cache_validity = 0;
484 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
485 && (fattr_supported & NFS_ATTR_FATTR_MODE))
486 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE);
487 /* Why so? Because we want revalidate for devices/FIFOs, and
488 * that's precisely what we have in nfs_file_inode_operations.
489 */
490 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
491 if (S_ISREG(inode->i_mode)) {
492 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
493 inode->i_data.a_ops = &nfs_file_aops;
494 nfs_inode_init_regular(nfsi);
495 mapping_set_large_folios(inode->i_mapping);
496 } else if (S_ISDIR(inode->i_mode)) {
497 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
498 inode->i_fop = &nfs_dir_operations;
499 inode->i_data.a_ops = &nfs_dir_aops;
500 nfs_inode_init_dir(nfsi);
501 /* Deal with crossing mountpoints */
502 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
503 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
504 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
505 inode->i_op = &nfs_referral_inode_operations;
506 else
507 inode->i_op = &nfs_mountpoint_inode_operations;
508 inode->i_fop = NULL;
509 inode->i_flags |= S_AUTOMOUNT;
510 }
511 } else if (S_ISLNK(inode->i_mode)) {
512 inode->i_op = &nfs_symlink_inode_operations;
513 inode_nohighmem(inode);
514 } else
515 init_special_inode(inode, inode->i_mode, fattr->rdev);
516
517 inode_set_atime(inode, 0, 0);
518 inode_set_mtime(inode, 0, 0);
519 inode_set_ctime(inode, 0, 0);
520 inode_set_iversion_raw(inode, 0);
521 inode->i_size = 0;
522 clear_nlink(inode);
523 inode->i_uid = make_kuid(&init_user_ns, -2);
524 inode->i_gid = make_kgid(&init_user_ns, -2);
525 inode->i_blocks = 0;
526 nfsi->write_io = 0;
527 nfsi->read_io = 0;
528
529 nfsi->read_cache_jiffies = fattr->time_start;
530 nfsi->attr_gencount = fattr->gencount;
531 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
532 inode_set_atime_to_ts(inode, fattr->atime);
533 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
534 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
535 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
536 inode_set_mtime_to_ts(inode, fattr->mtime);
537 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
538 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
539 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
540 inode_set_ctime_to_ts(inode, fattr->ctime);
541 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
542 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
543 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
544 inode_set_iversion_raw(inode, fattr->change_attr);
545 else
546 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
547 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
548 inode->i_size = nfs_size_to_loff_t(fattr->size);
549 else
550 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
551 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
552 set_nlink(inode, fattr->nlink);
553 else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
554 nfs_set_cache_invalid(inode, NFS_INO_INVALID_NLINK);
555 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
556 inode->i_uid = fattr->uid;
557 else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
558 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
559 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
560 inode->i_gid = fattr->gid;
561 else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
562 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
563 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
564 inode->i_blocks = fattr->du.nfs2.blocks;
565 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED &&
566 fattr->size != 0)
567 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
568 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
569 /*
570 * report the blocks in 512byte units
571 */
572 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
573 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED &&
574 fattr->size != 0)
575 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
576
577 nfs_setsecurity(inode, fattr);
578
579 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
580 nfsi->attrtimeo_timestamp = now;
581 nfsi->access_cache = RB_ROOT;
582
583 nfs_fscache_init_inode(inode);
584
585 unlock_new_inode(inode);
586 } else {
587 int err = nfs_refresh_inode(inode, fattr);
588 if (err < 0) {
589 iput(inode);
590 inode = ERR_PTR(err);
591 goto out_no_inode;
592 }
593 }
594 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
595 inode->i_sb->s_id,
596 (unsigned long long)NFS_FILEID(inode),
597 nfs_display_fhandle_hash(fh),
598 atomic_read(&inode->i_count));
599
600 out:
601 return inode;
602
603 out_no_inode:
604 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
605 goto out;
606 }
607 EXPORT_SYMBOL_GPL(nfs_fhget);
608
609 static void
nfs_fattr_fixup_delegated(struct inode * inode,struct nfs_fattr * fattr)610 nfs_fattr_fixup_delegated(struct inode *inode, struct nfs_fattr *fattr)
611 {
612 unsigned long cache_validity = NFS_I(inode)->cache_validity;
613
614 if (nfs_have_delegated_mtime(inode)) {
615 if (!(cache_validity & NFS_INO_INVALID_CTIME))
616 fattr->valid &= ~(NFS_ATTR_FATTR_PRECTIME |
617 NFS_ATTR_FATTR_CTIME);
618
619 if (!(cache_validity & NFS_INO_INVALID_MTIME))
620 fattr->valid &= ~(NFS_ATTR_FATTR_PREMTIME |
621 NFS_ATTR_FATTR_MTIME);
622
623 if (!(cache_validity & NFS_INO_INVALID_ATIME))
624 fattr->valid &= ~NFS_ATTR_FATTR_ATIME;
625 } else if (nfs_have_delegated_atime(inode)) {
626 if (!(cache_validity & NFS_INO_INVALID_ATIME))
627 fattr->valid &= ~NFS_ATTR_FATTR_ATIME;
628 }
629 }
630
nfs_update_delegated_atime(struct inode * inode)631 void nfs_update_delegated_atime(struct inode *inode)
632 {
633 spin_lock(&inode->i_lock);
634 if (nfs_have_delegated_atime(inode)) {
635 inode_update_timestamps(inode, S_ATIME);
636 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ATIME;
637 }
638 spin_unlock(&inode->i_lock);
639 }
640
nfs_update_delegated_mtime_locked(struct inode * inode)641 void nfs_update_delegated_mtime_locked(struct inode *inode)
642 {
643 if (nfs_have_delegated_mtime(inode)) {
644 inode_update_timestamps(inode, S_CTIME | S_MTIME);
645 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_CTIME |
646 NFS_INO_INVALID_MTIME);
647 }
648 }
649
nfs_update_delegated_mtime(struct inode * inode)650 void nfs_update_delegated_mtime(struct inode *inode)
651 {
652 spin_lock(&inode->i_lock);
653 nfs_update_delegated_mtime_locked(inode);
654 spin_unlock(&inode->i_lock);
655 }
656 EXPORT_SYMBOL_GPL(nfs_update_delegated_mtime);
657
658 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN)
659
660 int
nfs_setattr(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * attr)661 nfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
662 struct iattr *attr)
663 {
664 struct inode *inode = d_inode(dentry);
665 struct nfs_fattr *fattr;
666 int error = 0;
667
668 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
669
670 /* skip mode change if it's just for clearing setuid/setgid */
671 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
672 attr->ia_valid &= ~ATTR_MODE;
673
674 if (attr->ia_valid & ATTR_SIZE) {
675 BUG_ON(!S_ISREG(inode->i_mode));
676
677 error = inode_newsize_ok(inode, attr->ia_size);
678 if (error)
679 return error;
680
681 if (attr->ia_size == i_size_read(inode))
682 attr->ia_valid &= ~ATTR_SIZE;
683 }
684
685 if (nfs_have_delegated_mtime(inode)) {
686 if (attr->ia_valid & ATTR_MTIME) {
687 nfs_update_delegated_mtime(inode);
688 attr->ia_valid &= ~ATTR_MTIME;
689 }
690 if (attr->ia_valid & ATTR_ATIME) {
691 nfs_update_delegated_atime(inode);
692 attr->ia_valid &= ~ATTR_ATIME;
693 }
694 }
695
696 /* Optimization: if the end result is no change, don't RPC */
697 if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0)
698 return 0;
699
700 trace_nfs_setattr_enter(inode);
701
702 /* Write all dirty data */
703 if (S_ISREG(inode->i_mode))
704 nfs_sync_inode(inode);
705
706 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
707 if (fattr == NULL) {
708 error = -ENOMEM;
709 goto out;
710 }
711
712 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
713 if (error == 0)
714 error = nfs_refresh_inode(inode, fattr);
715 nfs_free_fattr(fattr);
716 out:
717 trace_nfs_setattr_exit(inode, error);
718 return error;
719 }
720 EXPORT_SYMBOL_GPL(nfs_setattr);
721
722 /**
723 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
724 * @inode: inode of the file used
725 * @offset: file offset to start truncating
726 *
727 * This is a copy of the common vmtruncate, but with the locking
728 * corrected to take into account the fact that NFS requires
729 * inode->i_size to be updated under the inode->i_lock.
730 * Note: must be called with inode->i_lock held!
731 */
nfs_vmtruncate(struct inode * inode,loff_t offset)732 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
733 {
734 int err;
735
736 err = inode_newsize_ok(inode, offset);
737 if (err)
738 goto out;
739
740 trace_nfs_size_truncate(inode, offset);
741 i_size_write(inode, offset);
742 /* Optimisation */
743 if (offset == 0) {
744 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
745 nfs_ooo_clear(NFS_I(inode));
746 }
747 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
748
749 spin_unlock(&inode->i_lock);
750 truncate_pagecache(inode, offset);
751 nfs_update_delegated_mtime_locked(inode);
752 spin_lock(&inode->i_lock);
753 out:
754 return err;
755 }
756
757 /**
758 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
759 * @inode: pointer to struct inode
760 * @attr: pointer to struct iattr
761 * @fattr: pointer to struct nfs_fattr
762 *
763 * Note: we do this in the *proc.c in order to ensure that
764 * it works for things like exclusive creates too.
765 */
nfs_setattr_update_inode(struct inode * inode,struct iattr * attr,struct nfs_fattr * fattr)766 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
767 struct nfs_fattr *fattr)
768 {
769 /* Barrier: bump the attribute generation count. */
770 nfs_fattr_set_barrier(fattr);
771
772 spin_lock(&inode->i_lock);
773 NFS_I(inode)->attr_gencount = fattr->gencount;
774 if ((attr->ia_valid & ATTR_SIZE) != 0) {
775 if (!nfs_have_delegated_mtime(inode))
776 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
777 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
778 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
779 nfs_vmtruncate(inode, attr->ia_size);
780 }
781 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
782 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
783 if ((attr->ia_valid & ATTR_KILL_SUID) != 0 &&
784 inode->i_mode & S_ISUID)
785 inode->i_mode &= ~S_ISUID;
786 if (setattr_should_drop_sgid(&nop_mnt_idmap, inode))
787 inode->i_mode &= ~S_ISGID;
788 if ((attr->ia_valid & ATTR_MODE) != 0) {
789 int mode = attr->ia_mode & S_IALLUGO;
790 mode |= inode->i_mode & ~S_IALLUGO;
791 inode->i_mode = mode;
792 }
793 if ((attr->ia_valid & ATTR_UID) != 0)
794 inode->i_uid = attr->ia_uid;
795 if ((attr->ia_valid & ATTR_GID) != 0)
796 inode->i_gid = attr->ia_gid;
797 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
798 inode_set_ctime_to_ts(inode, fattr->ctime);
799 else
800 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
801 | NFS_INO_INVALID_CTIME);
802 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
803 | NFS_INO_INVALID_ACL);
804 }
805 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
806 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
807 | NFS_INO_INVALID_CTIME);
808 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
809 inode_set_atime_to_ts(inode, fattr->atime);
810 else if (attr->ia_valid & ATTR_ATIME_SET)
811 inode_set_atime_to_ts(inode, attr->ia_atime);
812 else
813 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
814
815 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
816 inode_set_ctime_to_ts(inode, fattr->ctime);
817 else
818 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
819 | NFS_INO_INVALID_CTIME);
820 }
821 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
822 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
823 | NFS_INO_INVALID_CTIME);
824 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
825 inode_set_mtime_to_ts(inode, fattr->mtime);
826 else if (attr->ia_valid & ATTR_MTIME_SET)
827 inode_set_mtime_to_ts(inode, attr->ia_mtime);
828 else
829 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
830
831 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
832 inode_set_ctime_to_ts(inode, fattr->ctime);
833 else
834 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
835 | NFS_INO_INVALID_CTIME);
836 }
837 if (fattr->valid)
838 nfs_update_inode(inode, fattr);
839 spin_unlock(&inode->i_lock);
840 }
841 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
842
843 /*
844 * Don't request help from readdirplus if the file is being written to,
845 * or if attribute caching is turned off
846 */
nfs_getattr_readdirplus_enable(const struct inode * inode)847 static bool nfs_getattr_readdirplus_enable(const struct inode *inode)
848 {
849 return nfs_server_capable(inode, NFS_CAP_READDIRPLUS) &&
850 !nfs_have_writebacks(inode) && NFS_MAXATTRTIMEO(inode) > 5 * HZ;
851 }
852
nfs_readdirplus_parent_cache_miss(struct dentry * dentry)853 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
854 {
855 if (!IS_ROOT(dentry)) {
856 struct dentry *parent = dget_parent(dentry);
857 nfs_readdir_record_entry_cache_miss(d_inode(parent));
858 dput(parent);
859 }
860 }
861
nfs_readdirplus_parent_cache_hit(struct dentry * dentry)862 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
863 {
864 if (!IS_ROOT(dentry)) {
865 struct dentry *parent = dget_parent(dentry);
866 nfs_readdir_record_entry_cache_hit(d_inode(parent));
867 dput(parent);
868 }
869 }
870
nfs_get_valid_attrmask(struct inode * inode)871 static u32 nfs_get_valid_attrmask(struct inode *inode)
872 {
873 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
874 u32 reply_mask = STATX_INO | STATX_TYPE;
875
876 if (!(cache_validity & NFS_INO_INVALID_ATIME))
877 reply_mask |= STATX_ATIME;
878 if (!(cache_validity & NFS_INO_INVALID_CTIME))
879 reply_mask |= STATX_CTIME;
880 if (!(cache_validity & NFS_INO_INVALID_MTIME))
881 reply_mask |= STATX_MTIME;
882 if (!(cache_validity & NFS_INO_INVALID_SIZE))
883 reply_mask |= STATX_SIZE;
884 if (!(cache_validity & NFS_INO_INVALID_NLINK))
885 reply_mask |= STATX_NLINK;
886 if (!(cache_validity & NFS_INO_INVALID_MODE))
887 reply_mask |= STATX_MODE;
888 if (!(cache_validity & NFS_INO_INVALID_OTHER))
889 reply_mask |= STATX_UID | STATX_GID;
890 if (!(cache_validity & NFS_INO_INVALID_BLOCKS))
891 reply_mask |= STATX_BLOCKS;
892 if (!(cache_validity & NFS_INO_INVALID_CHANGE))
893 reply_mask |= STATX_CHANGE_COOKIE;
894 return reply_mask;
895 }
896
nfs_getattr(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)897 int nfs_getattr(struct mnt_idmap *idmap, const struct path *path,
898 struct kstat *stat, u32 request_mask, unsigned int query_flags)
899 {
900 struct inode *inode = d_inode(path->dentry);
901 struct nfs_server *server = NFS_SERVER(inode);
902 unsigned long cache_validity;
903 int err = 0;
904 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
905 bool do_update = false;
906 bool readdirplus_enabled = nfs_getattr_readdirplus_enable(inode);
907
908 trace_nfs_getattr_enter(inode);
909
910 request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID |
911 STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME |
912 STATX_INO | STATX_SIZE | STATX_BLOCKS |
913 STATX_CHANGE_COOKIE;
914
915 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
916 if (readdirplus_enabled)
917 nfs_readdirplus_parent_cache_hit(path->dentry);
918 goto out_no_revalidate;
919 }
920
921 /* Flush out writes to the server in order to update c/mtime/version. */
922 if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_CHANGE_COOKIE)) &&
923 S_ISREG(inode->i_mode)) {
924 if (nfs_have_delegated_mtime(inode))
925 filemap_fdatawrite(inode->i_mapping);
926 else
927 filemap_write_and_wait(inode->i_mapping);
928 }
929
930 /*
931 * We may force a getattr if the user cares about atime.
932 *
933 * Note that we only have to check the vfsmount flags here:
934 * - NFS always sets S_NOATIME by so checking it would give a
935 * bogus result
936 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
937 * no point in checking those.
938 */
939 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
940 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
941 request_mask &= ~STATX_ATIME;
942
943 /* Is the user requesting attributes that might need revalidation? */
944 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
945 STATX_MTIME|STATX_UID|STATX_GID|
946 STATX_SIZE|STATX_BLOCKS|
947 STATX_CHANGE_COOKIE)))
948 goto out_no_revalidate;
949
950 /* Check whether the cached attributes are stale */
951 do_update |= force_sync || nfs_attribute_cache_expired(inode);
952 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
953 do_update |= cache_validity & NFS_INO_INVALID_CHANGE;
954 if (request_mask & STATX_ATIME)
955 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
956 if (request_mask & STATX_CTIME)
957 do_update |= cache_validity & NFS_INO_INVALID_CTIME;
958 if (request_mask & STATX_MTIME)
959 do_update |= cache_validity & NFS_INO_INVALID_MTIME;
960 if (request_mask & STATX_SIZE)
961 do_update |= cache_validity & NFS_INO_INVALID_SIZE;
962 if (request_mask & STATX_NLINK)
963 do_update |= cache_validity & NFS_INO_INVALID_NLINK;
964 if (request_mask & STATX_MODE)
965 do_update |= cache_validity & NFS_INO_INVALID_MODE;
966 if (request_mask & (STATX_UID | STATX_GID))
967 do_update |= cache_validity & NFS_INO_INVALID_OTHER;
968 if (request_mask & STATX_BLOCKS)
969 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
970
971 if (do_update) {
972 if (readdirplus_enabled)
973 nfs_readdirplus_parent_cache_miss(path->dentry);
974 err = __nfs_revalidate_inode(server, inode);
975 if (err)
976 goto out;
977 } else if (readdirplus_enabled)
978 nfs_readdirplus_parent_cache_hit(path->dentry);
979 out_no_revalidate:
980 /* Only return attributes that were revalidated. */
981 stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask;
982
983 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
984 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
985 stat->change_cookie = inode_peek_iversion_raw(inode);
986 stat->attributes_mask |= STATX_ATTR_CHANGE_MONOTONIC;
987 if (server->change_attr_type != NFS4_CHANGE_TYPE_IS_UNDEFINED)
988 stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC;
989 if (S_ISDIR(inode->i_mode))
990 stat->blksize = NFS_SERVER(inode)->dtsize;
991 out:
992 trace_nfs_getattr_exit(inode, err);
993 return err;
994 }
995 EXPORT_SYMBOL_GPL(nfs_getattr);
996
nfs_init_lock_context(struct nfs_lock_context * l_ctx)997 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
998 {
999 refcount_set(&l_ctx->count, 1);
1000 l_ctx->lockowner = current->files;
1001 INIT_LIST_HEAD(&l_ctx->list);
1002 atomic_set(&l_ctx->io_count, 0);
1003 }
1004
__nfs_find_lock_context(struct nfs_open_context * ctx)1005 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
1006 {
1007 struct nfs_lock_context *pos;
1008
1009 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
1010 if (pos->lockowner != current->files)
1011 continue;
1012 if (refcount_inc_not_zero(&pos->count))
1013 return pos;
1014 }
1015 return NULL;
1016 }
1017
nfs_get_lock_context(struct nfs_open_context * ctx)1018 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
1019 {
1020 struct nfs_lock_context *res, *new = NULL;
1021 struct inode *inode = d_inode(ctx->dentry);
1022
1023 rcu_read_lock();
1024 res = __nfs_find_lock_context(ctx);
1025 rcu_read_unlock();
1026 if (res == NULL) {
1027 new = kmalloc(sizeof(*new), GFP_KERNEL_ACCOUNT);
1028 if (new == NULL)
1029 return ERR_PTR(-ENOMEM);
1030 nfs_init_lock_context(new);
1031 spin_lock(&inode->i_lock);
1032 res = __nfs_find_lock_context(ctx);
1033 if (res == NULL) {
1034 new->open_context = get_nfs_open_context(ctx);
1035 if (new->open_context) {
1036 list_add_tail_rcu(&new->list,
1037 &ctx->lock_context.list);
1038 res = new;
1039 new = NULL;
1040 } else
1041 res = ERR_PTR(-EBADF);
1042 }
1043 spin_unlock(&inode->i_lock);
1044 kfree(new);
1045 }
1046 return res;
1047 }
1048 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
1049
nfs_put_lock_context(struct nfs_lock_context * l_ctx)1050 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
1051 {
1052 struct nfs_open_context *ctx = l_ctx->open_context;
1053 struct inode *inode = d_inode(ctx->dentry);
1054
1055 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
1056 return;
1057 list_del_rcu(&l_ctx->list);
1058 spin_unlock(&inode->i_lock);
1059 put_nfs_open_context(ctx);
1060 kfree_rcu(l_ctx, rcu_head);
1061 }
1062 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
1063
1064 /**
1065 * nfs_close_context - Common close_context() routine NFSv2/v3
1066 * @ctx: pointer to context
1067 * @is_sync: is this a synchronous close
1068 *
1069 * Ensure that the attributes are up to date if we're mounted
1070 * with close-to-open semantics and we have cached data that will
1071 * need to be revalidated on open.
1072 */
nfs_close_context(struct nfs_open_context * ctx,int is_sync)1073 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
1074 {
1075 struct nfs_inode *nfsi;
1076 struct inode *inode;
1077
1078 if (!(ctx->mode & FMODE_WRITE))
1079 return;
1080 if (!is_sync)
1081 return;
1082 inode = d_inode(ctx->dentry);
1083 if (nfs_have_read_or_write_delegation(inode))
1084 return;
1085 nfsi = NFS_I(inode);
1086 if (inode->i_mapping->nrpages == 0)
1087 return;
1088 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1089 return;
1090 if (!list_empty(&nfsi->open_files))
1091 return;
1092 if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO)
1093 return;
1094 nfs_revalidate_inode(inode,
1095 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
1096 }
1097 EXPORT_SYMBOL_GPL(nfs_close_context);
1098
alloc_nfs_open_context(struct dentry * dentry,fmode_t f_mode,struct file * filp)1099 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
1100 fmode_t f_mode,
1101 struct file *filp)
1102 {
1103 struct nfs_open_context *ctx;
1104
1105 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL_ACCOUNT);
1106 if (!ctx)
1107 return ERR_PTR(-ENOMEM);
1108 nfs_sb_active(dentry->d_sb);
1109 ctx->dentry = dget(dentry);
1110 if (filp)
1111 ctx->cred = get_cred(filp->f_cred);
1112 else
1113 ctx->cred = get_current_cred();
1114 rcu_assign_pointer(ctx->ll_cred, NULL);
1115 ctx->state = NULL;
1116 ctx->mode = f_mode;
1117 ctx->flags = 0;
1118 ctx->error = 0;
1119 ctx->flock_owner = (fl_owner_t)filp;
1120 nfs_init_lock_context(&ctx->lock_context);
1121 ctx->lock_context.open_context = ctx;
1122 INIT_LIST_HEAD(&ctx->list);
1123 ctx->mdsthreshold = NULL;
1124 return ctx;
1125 }
1126 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1127
get_nfs_open_context(struct nfs_open_context * ctx)1128 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1129 {
1130 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1131 return ctx;
1132 return NULL;
1133 }
1134 EXPORT_SYMBOL_GPL(get_nfs_open_context);
1135
__put_nfs_open_context(struct nfs_open_context * ctx,int is_sync)1136 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1137 {
1138 struct inode *inode = d_inode(ctx->dentry);
1139 struct super_block *sb = ctx->dentry->d_sb;
1140
1141 if (!refcount_dec_and_test(&ctx->lock_context.count))
1142 return;
1143 if (!list_empty(&ctx->list)) {
1144 spin_lock(&inode->i_lock);
1145 list_del_rcu(&ctx->list);
1146 spin_unlock(&inode->i_lock);
1147 }
1148 if (inode != NULL)
1149 NFS_PROTO(inode)->close_context(ctx, is_sync);
1150 put_cred(ctx->cred);
1151 dput(ctx->dentry);
1152 nfs_sb_deactive(sb);
1153 put_rpccred(rcu_dereference_protected(ctx->ll_cred, 1));
1154 kfree(ctx->mdsthreshold);
1155 kfree_rcu(ctx, rcu_head);
1156 }
1157
put_nfs_open_context(struct nfs_open_context * ctx)1158 void put_nfs_open_context(struct nfs_open_context *ctx)
1159 {
1160 __put_nfs_open_context(ctx, 0);
1161 }
1162 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1163
put_nfs_open_context_sync(struct nfs_open_context * ctx)1164 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1165 {
1166 __put_nfs_open_context(ctx, 1);
1167 }
1168
1169 /*
1170 * Ensure that mmap has a recent RPC credential for use when writing out
1171 * shared pages
1172 */
nfs_inode_attach_open_context(struct nfs_open_context * ctx)1173 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1174 {
1175 struct inode *inode = d_inode(ctx->dentry);
1176 struct nfs_inode *nfsi = NFS_I(inode);
1177
1178 spin_lock(&inode->i_lock);
1179 if (list_empty(&nfsi->open_files) &&
1180 nfs_ooo_test(nfsi))
1181 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA |
1182 NFS_INO_REVAL_FORCED);
1183 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1184 spin_unlock(&inode->i_lock);
1185 }
1186 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1187
nfs_file_set_open_context(struct file * filp,struct nfs_open_context * ctx)1188 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1189 {
1190 filp->private_data = get_nfs_open_context(ctx);
1191 set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1192 if (list_empty(&ctx->list))
1193 nfs_inode_attach_open_context(ctx);
1194 }
1195 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1196
1197 /*
1198 * Given an inode, search for an open context with the desired characteristics
1199 */
nfs_find_open_context(struct inode * inode,const struct cred * cred,fmode_t mode)1200 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1201 {
1202 struct nfs_inode *nfsi = NFS_I(inode);
1203 struct nfs_open_context *pos, *ctx = NULL;
1204
1205 rcu_read_lock();
1206 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1207 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1208 continue;
1209 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1210 continue;
1211 if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags))
1212 continue;
1213 ctx = get_nfs_open_context(pos);
1214 if (ctx)
1215 break;
1216 }
1217 rcu_read_unlock();
1218 return ctx;
1219 }
1220
nfs_file_clear_open_context(struct file * filp)1221 void nfs_file_clear_open_context(struct file *filp)
1222 {
1223 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1224
1225 if (ctx) {
1226 struct inode *inode = d_inode(ctx->dentry);
1227
1228 clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1229 /*
1230 * We fatal error on write before. Try to writeback
1231 * every page again.
1232 */
1233 if (ctx->error < 0)
1234 invalidate_inode_pages2(inode->i_mapping);
1235 filp->private_data = NULL;
1236 put_nfs_open_context_sync(ctx);
1237 }
1238 }
1239
1240 /*
1241 * These allocate and release file read/write context information.
1242 */
nfs_open(struct inode * inode,struct file * filp)1243 int nfs_open(struct inode *inode, struct file *filp)
1244 {
1245 struct nfs_open_context *ctx;
1246
1247 ctx = alloc_nfs_open_context(file_dentry(filp),
1248 flags_to_mode(filp->f_flags), filp);
1249 if (IS_ERR(ctx))
1250 return PTR_ERR(ctx);
1251 nfs_file_set_open_context(filp, ctx);
1252 put_nfs_open_context(ctx);
1253 nfs_fscache_open_file(inode, filp);
1254 return 0;
1255 }
1256
1257 /*
1258 * This function is called whenever some part of NFS notices that
1259 * the cached attributes have to be refreshed.
1260 */
1261 int
__nfs_revalidate_inode(struct nfs_server * server,struct inode * inode)1262 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1263 {
1264 int status = -ESTALE;
1265 struct nfs_fattr *fattr = NULL;
1266 struct nfs_inode *nfsi = NFS_I(inode);
1267
1268 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1269 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1270
1271 trace_nfs_revalidate_inode_enter(inode);
1272
1273 if (is_bad_inode(inode))
1274 goto out;
1275 if (NFS_STALE(inode))
1276 goto out;
1277
1278 /* pNFS: Attributes aren't updated until we layoutcommit */
1279 if (S_ISREG(inode->i_mode)) {
1280 status = pnfs_sync_inode(inode, false);
1281 if (status)
1282 goto out;
1283 }
1284
1285 status = -ENOMEM;
1286 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
1287 if (fattr == NULL)
1288 goto out;
1289
1290 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1291
1292 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, inode);
1293 if (status != 0) {
1294 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1295 inode->i_sb->s_id,
1296 (unsigned long long)NFS_FILEID(inode), status);
1297 switch (status) {
1298 case -ETIMEDOUT:
1299 /* A soft timeout occurred. Use cached information? */
1300 if (server->flags & NFS_MOUNT_SOFTREVAL)
1301 status = 0;
1302 break;
1303 case -ESTALE:
1304 if (!S_ISDIR(inode->i_mode))
1305 nfs_set_inode_stale(inode);
1306 else
1307 nfs_zap_caches(inode);
1308 }
1309 goto out;
1310 }
1311
1312 status = nfs_refresh_inode(inode, fattr);
1313 if (status) {
1314 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1315 inode->i_sb->s_id,
1316 (unsigned long long)NFS_FILEID(inode), status);
1317 goto out;
1318 }
1319
1320 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1321 nfs_zap_acl_cache(inode);
1322
1323 nfs_setsecurity(inode, fattr);
1324
1325 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1326 inode->i_sb->s_id,
1327 (unsigned long long)NFS_FILEID(inode));
1328
1329 out:
1330 nfs_free_fattr(fattr);
1331 trace_nfs_revalidate_inode_exit(inode, status);
1332 return status;
1333 }
1334
nfs_attribute_cache_expired(struct inode * inode)1335 int nfs_attribute_cache_expired(struct inode *inode)
1336 {
1337 if (nfs_have_delegated_attributes(inode))
1338 return 0;
1339 return nfs_attribute_timeout(inode);
1340 }
1341
1342 /**
1343 * nfs_revalidate_inode - Revalidate the inode attributes
1344 * @inode: pointer to inode struct
1345 * @flags: cache flags to check
1346 *
1347 * Updates inode attribute information by retrieving the data from the server.
1348 */
nfs_revalidate_inode(struct inode * inode,unsigned long flags)1349 int nfs_revalidate_inode(struct inode *inode, unsigned long flags)
1350 {
1351 if (!nfs_check_cache_invalid(inode, flags))
1352 return NFS_STALE(inode) ? -ESTALE : 0;
1353 return __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1354 }
1355 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1356
nfs_invalidate_mapping(struct inode * inode,struct address_space * mapping)1357 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1358 {
1359 int ret;
1360
1361 nfs_fscache_invalidate(inode, 0);
1362 if (mapping->nrpages != 0) {
1363 if (S_ISREG(inode->i_mode)) {
1364 ret = nfs_sync_mapping(mapping);
1365 if (ret < 0)
1366 return ret;
1367 }
1368 ret = invalidate_inode_pages2(mapping);
1369 if (ret < 0)
1370 return ret;
1371 }
1372 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1373
1374 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1375 inode->i_sb->s_id,
1376 (unsigned long long)NFS_FILEID(inode));
1377 return 0;
1378 }
1379
1380 /**
1381 * nfs_clear_invalid_mapping - Conditionally clear a mapping
1382 * @mapping: pointer to mapping
1383 *
1384 * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping.
1385 */
nfs_clear_invalid_mapping(struct address_space * mapping)1386 int nfs_clear_invalid_mapping(struct address_space *mapping)
1387 {
1388 struct inode *inode = mapping->host;
1389 struct nfs_inode *nfsi = NFS_I(inode);
1390 unsigned long *bitlock = &nfsi->flags;
1391 int ret = 0;
1392
1393 /*
1394 * We must clear NFS_INO_INVALID_DATA first to ensure that
1395 * invalidations that come in while we're shooting down the mappings
1396 * are respected. But, that leaves a race window where one revalidator
1397 * can clear the flag, and then another checks it before the mapping
1398 * gets invalidated. Fix that by serializing access to this part of
1399 * the function.
1400 *
1401 * At the same time, we need to allow other tasks to see whether we
1402 * might be in the middle of invalidating the pages, so we only set
1403 * the bit lock here if it looks like we're going to be doing that.
1404 */
1405 for (;;) {
1406 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1407 nfs_wait_bit_killable,
1408 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
1409 if (ret)
1410 goto out;
1411 spin_lock(&inode->i_lock);
1412 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1413 spin_unlock(&inode->i_lock);
1414 continue;
1415 }
1416 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1417 break;
1418 spin_unlock(&inode->i_lock);
1419 goto out;
1420 }
1421
1422 set_bit(NFS_INO_INVALIDATING, bitlock);
1423 smp_wmb();
1424 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1425 nfs_ooo_clear(nfsi);
1426 spin_unlock(&inode->i_lock);
1427 trace_nfs_invalidate_mapping_enter(inode);
1428 ret = nfs_invalidate_mapping(inode, mapping);
1429 trace_nfs_invalidate_mapping_exit(inode, ret);
1430
1431 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1432 smp_mb__after_atomic();
1433 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1434 out:
1435 return ret;
1436 }
1437
nfs_mapping_need_revalidate_inode(struct inode * inode)1438 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1439 {
1440 return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) ||
1441 NFS_STALE(inode);
1442 }
1443
nfs_revalidate_mapping_rcu(struct inode * inode)1444 int nfs_revalidate_mapping_rcu(struct inode *inode)
1445 {
1446 struct nfs_inode *nfsi = NFS_I(inode);
1447 unsigned long *bitlock = &nfsi->flags;
1448 int ret = 0;
1449
1450 if (IS_SWAPFILE(inode))
1451 goto out;
1452 if (nfs_mapping_need_revalidate_inode(inode)) {
1453 ret = -ECHILD;
1454 goto out;
1455 }
1456 spin_lock(&inode->i_lock);
1457 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1458 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1459 ret = -ECHILD;
1460 spin_unlock(&inode->i_lock);
1461 out:
1462 return ret;
1463 }
1464
1465 /**
1466 * nfs_revalidate_mapping - Revalidate the pagecache
1467 * @inode: pointer to host inode
1468 * @mapping: pointer to mapping
1469 */
nfs_revalidate_mapping(struct inode * inode,struct address_space * mapping)1470 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1471 {
1472 /* swapfiles are not supposed to be shared. */
1473 if (IS_SWAPFILE(inode))
1474 return 0;
1475
1476 if (nfs_mapping_need_revalidate_inode(inode)) {
1477 int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1478 if (ret < 0)
1479 return ret;
1480 }
1481
1482 return nfs_clear_invalid_mapping(mapping);
1483 }
1484
nfs_file_has_writers(struct nfs_inode * nfsi)1485 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1486 {
1487 struct inode *inode = &nfsi->vfs_inode;
1488
1489 if (!S_ISREG(inode->i_mode))
1490 return false;
1491 if (list_empty(&nfsi->open_files))
1492 return false;
1493 return inode_is_open_for_write(inode);
1494 }
1495
nfs_file_has_buffered_writers(struct nfs_inode * nfsi)1496 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1497 {
1498 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1499 }
1500
nfs_wcc_update_inode(struct inode * inode,struct nfs_fattr * fattr)1501 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1502 {
1503 struct timespec64 ts;
1504
1505 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1506 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1507 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1508 inode_set_iversion_raw(inode, fattr->change_attr);
1509 if (S_ISDIR(inode->i_mode))
1510 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1511 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1512 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
1513 }
1514 /* If we have atomic WCC data, we may update some attributes */
1515 ts = inode_get_ctime(inode);
1516 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1517 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1518 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1519 inode_set_ctime_to_ts(inode, fattr->ctime);
1520 }
1521
1522 ts = inode_get_mtime(inode);
1523 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1524 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1525 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1526 inode_set_mtime_to_ts(inode, fattr->mtime);
1527 }
1528 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1529 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1530 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1531 && !nfs_have_writebacks(inode)) {
1532 trace_nfs_size_wcc(inode, fattr->size);
1533 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1534 }
1535 }
1536
1537 /**
1538 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1539 * @inode: pointer to inode
1540 * @fattr: updated attributes
1541 *
1542 * Verifies the attribute cache. If we have just changed the attributes,
1543 * so that fattr carries weak cache consistency data, then it may
1544 * also update the ctime/mtime/change_attribute.
1545 */
nfs_check_inode_attributes(struct inode * inode,struct nfs_fattr * fattr)1546 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1547 {
1548 struct nfs_inode *nfsi = NFS_I(inode);
1549 loff_t cur_size, new_isize;
1550 unsigned long invalid = 0;
1551 struct timespec64 ts;
1552
1553 if (nfs_have_delegated_attributes(inode))
1554 return 0;
1555
1556 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1557 /* Only a mounted-on-fileid? Just exit */
1558 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1559 return 0;
1560 /* Has the inode gone and changed behind our back? */
1561 } else if (nfsi->fileid != fattr->fileid) {
1562 /* Is this perhaps the mounted-on fileid? */
1563 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1564 nfsi->fileid == fattr->mounted_on_fileid)
1565 return 0;
1566 return -ESTALE;
1567 }
1568 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode))
1569 return -ESTALE;
1570
1571
1572 if (!nfs_file_has_buffered_writers(nfsi)) {
1573 /* Verify a few of the more important attributes */
1574 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1575 invalid |= NFS_INO_INVALID_CHANGE;
1576
1577 ts = inode_get_mtime(inode);
1578 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
1579 invalid |= NFS_INO_INVALID_MTIME;
1580
1581 ts = inode_get_ctime(inode);
1582 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
1583 invalid |= NFS_INO_INVALID_CTIME;
1584
1585 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1586 cur_size = i_size_read(inode);
1587 new_isize = nfs_size_to_loff_t(fattr->size);
1588 if (cur_size != new_isize)
1589 invalid |= NFS_INO_INVALID_SIZE;
1590 }
1591 }
1592
1593 /* Have any file permissions changed? */
1594 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1595 invalid |= NFS_INO_INVALID_MODE;
1596 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1597 invalid |= NFS_INO_INVALID_OTHER;
1598 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1599 invalid |= NFS_INO_INVALID_OTHER;
1600
1601 /* Has the link count changed? */
1602 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1603 invalid |= NFS_INO_INVALID_NLINK;
1604
1605 ts = inode_get_atime(inode);
1606 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
1607 invalid |= NFS_INO_INVALID_ATIME;
1608
1609 if (invalid != 0)
1610 nfs_set_cache_invalid(inode, invalid);
1611
1612 nfsi->read_cache_jiffies = fattr->time_start;
1613 return 0;
1614 }
1615
1616 static atomic_long_t nfs_attr_generation_counter;
1617
nfs_read_attr_generation_counter(void)1618 static unsigned long nfs_read_attr_generation_counter(void)
1619 {
1620 return atomic_long_read(&nfs_attr_generation_counter);
1621 }
1622
nfs_inc_attr_generation_counter(void)1623 unsigned long nfs_inc_attr_generation_counter(void)
1624 {
1625 return atomic_long_inc_return(&nfs_attr_generation_counter);
1626 }
1627 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1628
nfs_fattr_init(struct nfs_fattr * fattr)1629 void nfs_fattr_init(struct nfs_fattr *fattr)
1630 {
1631 fattr->valid = 0;
1632 fattr->time_start = jiffies;
1633 fattr->gencount = nfs_inc_attr_generation_counter();
1634 fattr->owner_name = NULL;
1635 fattr->group_name = NULL;
1636 }
1637 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1638
1639 /**
1640 * nfs_fattr_set_barrier
1641 * @fattr: attributes
1642 *
1643 * Used to set a barrier after an attribute was updated. This
1644 * barrier ensures that older attributes from RPC calls that may
1645 * have raced with our update cannot clobber these new values.
1646 * Note that you are still responsible for ensuring that other
1647 * operations which change the attribute on the server do not
1648 * collide.
1649 */
nfs_fattr_set_barrier(struct nfs_fattr * fattr)1650 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1651 {
1652 fattr->gencount = nfs_inc_attr_generation_counter();
1653 }
1654
nfs_alloc_fattr(void)1655 struct nfs_fattr *nfs_alloc_fattr(void)
1656 {
1657 struct nfs_fattr *fattr;
1658
1659 fattr = kmalloc(sizeof(*fattr), GFP_KERNEL);
1660 if (fattr != NULL) {
1661 nfs_fattr_init(fattr);
1662 fattr->label = NULL;
1663 }
1664 return fattr;
1665 }
1666 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1667
nfs_alloc_fattr_with_label(struct nfs_server * server)1668 struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server)
1669 {
1670 struct nfs_fattr *fattr = nfs_alloc_fattr();
1671
1672 if (!fattr)
1673 return NULL;
1674
1675 fattr->label = nfs4_label_alloc(server, GFP_KERNEL);
1676 if (IS_ERR(fattr->label)) {
1677 kfree(fattr);
1678 return NULL;
1679 }
1680
1681 return fattr;
1682 }
1683 EXPORT_SYMBOL_GPL(nfs_alloc_fattr_with_label);
1684
nfs_alloc_fhandle(void)1685 struct nfs_fh *nfs_alloc_fhandle(void)
1686 {
1687 struct nfs_fh *fh;
1688
1689 fh = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL);
1690 if (fh != NULL)
1691 fh->size = 0;
1692 return fh;
1693 }
1694 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1695
1696 #ifdef NFS_DEBUG
1697 /*
1698 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1699 * in the same way that wireshark does
1700 *
1701 * @fh: file handle
1702 *
1703 * For debugging only.
1704 */
_nfs_display_fhandle_hash(const struct nfs_fh * fh)1705 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1706 {
1707 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1708 * not on the result */
1709 return nfs_fhandle_hash(fh);
1710 }
1711 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1712
1713 /*
1714 * _nfs_display_fhandle - display an NFS file handle on the console
1715 *
1716 * @fh: file handle to display
1717 * @caption: display caption
1718 *
1719 * For debugging only.
1720 */
_nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)1721 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1722 {
1723 unsigned short i;
1724
1725 if (fh == NULL || fh->size == 0) {
1726 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1727 return;
1728 }
1729
1730 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1731 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1732 for (i = 0; i < fh->size; i += 16) {
1733 __be32 *pos = (__be32 *)&fh->data[i];
1734
1735 switch ((fh->size - i - 1) >> 2) {
1736 case 0:
1737 printk(KERN_DEFAULT " %08x\n",
1738 be32_to_cpup(pos));
1739 break;
1740 case 1:
1741 printk(KERN_DEFAULT " %08x %08x\n",
1742 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1743 break;
1744 case 2:
1745 printk(KERN_DEFAULT " %08x %08x %08x\n",
1746 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1747 be32_to_cpup(pos + 2));
1748 break;
1749 default:
1750 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1751 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1752 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1753 }
1754 }
1755 }
1756 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1757 #endif
1758
1759 /**
1760 * nfs_inode_attrs_cmp_generic - compare attributes
1761 * @fattr: attributes
1762 * @inode: pointer to inode
1763 *
1764 * Attempt to divine whether or not an RPC call reply carrying stale
1765 * attributes got scheduled after another call carrying updated ones.
1766 * Note also the check for wraparound of 'attr_gencount'
1767 *
1768 * The function returns '1' if it thinks the attributes in @fattr are
1769 * more recent than the ones cached in @inode. Otherwise it returns
1770 * the value '0'.
1771 */
nfs_inode_attrs_cmp_generic(const struct nfs_fattr * fattr,const struct inode * inode)1772 static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr,
1773 const struct inode *inode)
1774 {
1775 unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1776
1777 return (long)(fattr->gencount - attr_gencount) > 0 ||
1778 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1779 }
1780
1781 /**
1782 * nfs_inode_attrs_cmp_monotonic - compare attributes
1783 * @fattr: attributes
1784 * @inode: pointer to inode
1785 *
1786 * Attempt to divine whether or not an RPC call reply carrying stale
1787 * attributes got scheduled after another call carrying updated ones.
1788 *
1789 * We assume that the server observes monotonic semantics for
1790 * the change attribute, so a larger value means that the attributes in
1791 * @fattr are more recent, in which case the function returns the
1792 * value '1'.
1793 * A return value of '0' indicates no measurable change
1794 * A return value of '-1' means that the attributes in @inode are
1795 * more recent.
1796 */
nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr * fattr,const struct inode * inode)1797 static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr,
1798 const struct inode *inode)
1799 {
1800 s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode);
1801 if (diff > 0)
1802 return 1;
1803 return diff == 0 ? 0 : -1;
1804 }
1805
1806 /**
1807 * nfs_inode_attrs_cmp_strict_monotonic - compare attributes
1808 * @fattr: attributes
1809 * @inode: pointer to inode
1810 *
1811 * Attempt to divine whether or not an RPC call reply carrying stale
1812 * attributes got scheduled after another call carrying updated ones.
1813 *
1814 * We assume that the server observes strictly monotonic semantics for
1815 * the change attribute, so a larger value means that the attributes in
1816 * @fattr are more recent, in which case the function returns the
1817 * value '1'.
1818 * A return value of '-1' means that the attributes in @inode are
1819 * more recent or unchanged.
1820 */
nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr * fattr,const struct inode * inode)1821 static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr,
1822 const struct inode *inode)
1823 {
1824 return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1;
1825 }
1826
1827 /**
1828 * nfs_inode_attrs_cmp - compare attributes
1829 * @fattr: attributes
1830 * @inode: pointer to inode
1831 *
1832 * This function returns '1' if it thinks the attributes in @fattr are
1833 * more recent than the ones cached in @inode. It returns '-1' if
1834 * the attributes in @inode are more recent than the ones in @fattr,
1835 * and it returns 0 if not sure.
1836 */
nfs_inode_attrs_cmp(const struct nfs_fattr * fattr,const struct inode * inode)1837 static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr,
1838 const struct inode *inode)
1839 {
1840 if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0)
1841 return 1;
1842 switch (NFS_SERVER(inode)->change_attr_type) {
1843 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1844 break;
1845 case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
1846 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1847 break;
1848 return nfs_inode_attrs_cmp_monotonic(fattr, inode);
1849 default:
1850 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1851 break;
1852 return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode);
1853 }
1854 return 0;
1855 }
1856
1857 /**
1858 * nfs_inode_finish_partial_attr_update - complete a previous inode update
1859 * @fattr: attributes
1860 * @inode: pointer to inode
1861 *
1862 * Returns '1' if the last attribute update left the inode cached
1863 * attributes in a partially unrevalidated state, and @fattr
1864 * matches the change attribute of that partial update.
1865 * Otherwise returns '0'.
1866 */
nfs_inode_finish_partial_attr_update(const struct nfs_fattr * fattr,const struct inode * inode)1867 static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr,
1868 const struct inode *inode)
1869 {
1870 const unsigned long check_valid =
1871 NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME |
1872 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
1873 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER |
1874 NFS_INO_INVALID_NLINK;
1875 unsigned long cache_validity = NFS_I(inode)->cache_validity;
1876 enum nfs4_change_attr_type ctype = NFS_SERVER(inode)->change_attr_type;
1877
1878 if (ctype != NFS4_CHANGE_TYPE_IS_UNDEFINED &&
1879 !(cache_validity & NFS_INO_INVALID_CHANGE) &&
1880 (cache_validity & check_valid) != 0 &&
1881 (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1882 nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0)
1883 return 1;
1884 return 0;
1885 }
1886
nfs_ooo_merge(struct nfs_inode * nfsi,u64 start,u64 end)1887 static void nfs_ooo_merge(struct nfs_inode *nfsi,
1888 u64 start, u64 end)
1889 {
1890 int i, cnt;
1891
1892 if (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)
1893 /* No point merging anything */
1894 return;
1895
1896 if (!nfsi->ooo) {
1897 nfsi->ooo = kmalloc(sizeof(*nfsi->ooo), GFP_ATOMIC);
1898 if (!nfsi->ooo) {
1899 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1900 return;
1901 }
1902 nfsi->ooo->cnt = 0;
1903 }
1904
1905 /* add this range, merging if possible */
1906 cnt = nfsi->ooo->cnt;
1907 for (i = 0; i < cnt; i++) {
1908 if (end == nfsi->ooo->gap[i].start)
1909 end = nfsi->ooo->gap[i].end;
1910 else if (start == nfsi->ooo->gap[i].end)
1911 start = nfsi->ooo->gap[i].start;
1912 else
1913 continue;
1914 /* Remove 'i' from table and loop to insert the new range */
1915 cnt -= 1;
1916 nfsi->ooo->gap[i] = nfsi->ooo->gap[cnt];
1917 i = -1;
1918 }
1919 if (start != end) {
1920 if (cnt >= ARRAY_SIZE(nfsi->ooo->gap)) {
1921 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1922 kfree(nfsi->ooo);
1923 nfsi->ooo = NULL;
1924 return;
1925 }
1926 nfsi->ooo->gap[cnt].start = start;
1927 nfsi->ooo->gap[cnt].end = end;
1928 cnt += 1;
1929 }
1930 nfsi->ooo->cnt = cnt;
1931 }
1932
nfs_ooo_record(struct nfs_inode * nfsi,struct nfs_fattr * fattr)1933 static void nfs_ooo_record(struct nfs_inode *nfsi,
1934 struct nfs_fattr *fattr)
1935 {
1936 /* This reply was out-of-order, so record in the
1937 * pre/post change id, possibly cancelling
1938 * gaps created when iversion was jumpped forward.
1939 */
1940 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) &&
1941 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE))
1942 nfs_ooo_merge(nfsi,
1943 fattr->change_attr,
1944 fattr->pre_change_attr);
1945 }
1946
nfs_refresh_inode_locked(struct inode * inode,struct nfs_fattr * fattr)1947 static int nfs_refresh_inode_locked(struct inode *inode,
1948 struct nfs_fattr *fattr)
1949 {
1950 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
1951 int ret = 0;
1952
1953 trace_nfs_refresh_inode_enter(inode);
1954
1955 if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode))
1956 ret = nfs_update_inode(inode, fattr);
1957 else {
1958 nfs_ooo_record(NFS_I(inode), fattr);
1959
1960 if (attr_cmp == 0)
1961 ret = nfs_check_inode_attributes(inode, fattr);
1962 }
1963
1964 trace_nfs_refresh_inode_exit(inode, ret);
1965 return ret;
1966 }
1967
1968 /**
1969 * nfs_refresh_inode - try to update the inode attribute cache
1970 * @inode: pointer to inode
1971 * @fattr: updated attributes
1972 *
1973 * Check that an RPC call that returned attributes has not overlapped with
1974 * other recent updates of the inode metadata, then decide whether it is
1975 * safe to do a full update of the inode attributes, or whether just to
1976 * call nfs_check_inode_attributes.
1977 */
nfs_refresh_inode(struct inode * inode,struct nfs_fattr * fattr)1978 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1979 {
1980 int status;
1981
1982 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1983 return 0;
1984 spin_lock(&inode->i_lock);
1985 status = nfs_refresh_inode_locked(inode, fattr);
1986 spin_unlock(&inode->i_lock);
1987
1988 return status;
1989 }
1990 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1991
nfs_post_op_update_inode_locked(struct inode * inode,struct nfs_fattr * fattr,unsigned int invalid)1992 static int nfs_post_op_update_inode_locked(struct inode *inode,
1993 struct nfs_fattr *fattr, unsigned int invalid)
1994 {
1995 if (S_ISDIR(inode->i_mode))
1996 invalid |= NFS_INO_INVALID_DATA;
1997 nfs_set_cache_invalid(inode, invalid);
1998 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1999 return 0;
2000 return nfs_refresh_inode_locked(inode, fattr);
2001 }
2002
2003 /**
2004 * nfs_post_op_update_inode - try to update the inode attribute cache
2005 * @inode: pointer to inode
2006 * @fattr: updated attributes
2007 *
2008 * After an operation that has changed the inode metadata, mark the
2009 * attribute cache as being invalid, then try to update it.
2010 *
2011 * NB: if the server didn't return any post op attributes, this
2012 * function will force the retrieval of attributes before the next
2013 * NFS request. Thus it should be used only for operations that
2014 * are expected to change one or more attributes, to avoid
2015 * unnecessary NFS requests and trips through nfs_update_inode().
2016 */
nfs_post_op_update_inode(struct inode * inode,struct nfs_fattr * fattr)2017 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2018 {
2019 int status;
2020
2021 spin_lock(&inode->i_lock);
2022 nfs_fattr_set_barrier(fattr);
2023 status = nfs_post_op_update_inode_locked(inode, fattr,
2024 NFS_INO_INVALID_CHANGE
2025 | NFS_INO_INVALID_CTIME
2026 | NFS_INO_REVAL_FORCED);
2027 spin_unlock(&inode->i_lock);
2028
2029 return status;
2030 }
2031 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
2032
2033 /**
2034 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
2035 * @inode: pointer to inode
2036 * @fattr: updated attributes
2037 *
2038 * After an operation that has changed the inode metadata, mark the
2039 * attribute cache as being invalid, then try to update it. Fake up
2040 * weak cache consistency data, if none exist.
2041 *
2042 * This function is mainly designed to be used by the ->write_done() functions.
2043 */
nfs_post_op_update_inode_force_wcc_locked(struct inode * inode,struct nfs_fattr * fattr)2044 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
2045 {
2046 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
2047 int status;
2048
2049 /* Don't do a WCC update if these attributes are already stale */
2050 if (attr_cmp < 0)
2051 return 0;
2052 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) {
2053 /* Record the pre/post change info before clearing PRECHANGE */
2054 nfs_ooo_record(NFS_I(inode), fattr);
2055 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
2056 | NFS_ATTR_FATTR_PRESIZE
2057 | NFS_ATTR_FATTR_PREMTIME
2058 | NFS_ATTR_FATTR_PRECTIME);
2059 goto out_noforce;
2060 }
2061 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
2062 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
2063 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
2064 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
2065 }
2066 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
2067 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
2068 fattr->pre_ctime = inode_get_ctime(inode);
2069 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
2070 }
2071 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
2072 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
2073 fattr->pre_mtime = inode_get_mtime(inode);
2074 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
2075 }
2076 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
2077 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
2078 fattr->pre_size = i_size_read(inode);
2079 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
2080 }
2081 out_noforce:
2082 status = nfs_post_op_update_inode_locked(inode, fattr,
2083 NFS_INO_INVALID_CHANGE
2084 | NFS_INO_INVALID_CTIME
2085 | NFS_INO_INVALID_MTIME
2086 | NFS_INO_INVALID_BLOCKS);
2087 return status;
2088 }
2089
2090 /**
2091 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
2092 * @inode: pointer to inode
2093 * @fattr: updated attributes
2094 *
2095 * After an operation that has changed the inode metadata, mark the
2096 * attribute cache as being invalid, then try to update it. Fake up
2097 * weak cache consistency data, if none exist.
2098 *
2099 * This function is mainly designed to be used by the ->write_done() functions.
2100 */
nfs_post_op_update_inode_force_wcc(struct inode * inode,struct nfs_fattr * fattr)2101 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
2102 {
2103 int status;
2104
2105 spin_lock(&inode->i_lock);
2106 nfs_fattr_set_barrier(fattr);
2107 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
2108 spin_unlock(&inode->i_lock);
2109 return status;
2110 }
2111 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
2112
2113
2114 /*
2115 * Many nfs protocol calls return the new file attributes after
2116 * an operation. Here we update the inode to reflect the state
2117 * of the server's inode.
2118 *
2119 * This is a bit tricky because we have to make sure all dirty pages
2120 * have been sent off to the server before calling invalidate_inode_pages.
2121 * To make sure no other process adds more write requests while we try
2122 * our best to flush them, we make them sleep during the attribute refresh.
2123 *
2124 * A very similar scenario holds for the dir cache.
2125 */
nfs_update_inode(struct inode * inode,struct nfs_fattr * fattr)2126 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2127 {
2128 struct nfs_server *server = NFS_SERVER(inode);
2129 struct nfs_inode *nfsi = NFS_I(inode);
2130 loff_t cur_isize, new_isize;
2131 u64 fattr_supported = server->fattr_valid;
2132 unsigned long invalid = 0;
2133 unsigned long now = jiffies;
2134 unsigned long save_cache_validity;
2135 bool have_writers = nfs_file_has_buffered_writers(nfsi);
2136 bool cache_revalidated = true;
2137 bool attr_changed = false;
2138 bool have_delegation;
2139
2140 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
2141 __func__, inode->i_sb->s_id, inode->i_ino,
2142 nfs_display_fhandle_hash(NFS_FH(inode)),
2143 atomic_read(&inode->i_count), fattr->valid);
2144
2145 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
2146 /* Only a mounted-on-fileid? Just exit */
2147 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
2148 return 0;
2149 /* Has the inode gone and changed behind our back? */
2150 } else if (nfsi->fileid != fattr->fileid) {
2151 /* Is this perhaps the mounted-on fileid? */
2152 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
2153 nfsi->fileid == fattr->mounted_on_fileid)
2154 return 0;
2155 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
2156 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
2157 NFS_SERVER(inode)->nfs_client->cl_hostname,
2158 inode->i_sb->s_id, (long long)nfsi->fileid,
2159 (long long)fattr->fileid);
2160 goto out_err;
2161 }
2162
2163 /*
2164 * Make sure the inode's type hasn't changed.
2165 */
2166 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
2167 /*
2168 * Big trouble! The inode has become a different object.
2169 */
2170 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
2171 __func__, inode->i_ino, inode->i_mode, fattr->mode);
2172 goto out_err;
2173 }
2174
2175 /* Update the fsid? */
2176 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
2177 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
2178 !IS_AUTOMOUNT(inode))
2179 server->fsid = fattr->fsid;
2180
2181 /* Save the delegation state before clearing cache_validity */
2182 have_delegation = nfs_have_delegated_attributes(inode);
2183
2184 /*
2185 * Update the read time so we don't revalidate too often.
2186 */
2187 nfsi->read_cache_jiffies = fattr->time_start;
2188
2189 /* Fix up any delegated attributes in the struct nfs_fattr */
2190 nfs_fattr_fixup_delegated(inode, fattr);
2191
2192 save_cache_validity = nfsi->cache_validity;
2193 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
2194 | NFS_INO_INVALID_ATIME
2195 | NFS_INO_REVAL_FORCED
2196 | NFS_INO_INVALID_BLOCKS);
2197
2198 /* Do atomic weak cache consistency updates */
2199 nfs_wcc_update_inode(inode, fattr);
2200
2201 if (pnfs_layoutcommit_outstanding(inode)) {
2202 nfsi->cache_validity |=
2203 save_cache_validity &
2204 (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
2205 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
2206 NFS_INO_INVALID_BLOCKS);
2207 cache_revalidated = false;
2208 }
2209
2210 /* More cache consistency checks */
2211 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
2212 if (!have_writers && nfsi->ooo && nfsi->ooo->cnt == 1 &&
2213 nfsi->ooo->gap[0].end == inode_peek_iversion_raw(inode)) {
2214 /* There is one remaining gap that hasn't been
2215 * merged into iversion - do that now.
2216 */
2217 inode_set_iversion_raw(inode, nfsi->ooo->gap[0].start);
2218 kfree(nfsi->ooo);
2219 nfsi->ooo = NULL;
2220 }
2221 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
2222 /* Could it be a race with writeback? */
2223 if (!(have_writers || have_delegation)) {
2224 invalid |= NFS_INO_INVALID_DATA
2225 | NFS_INO_INVALID_ACCESS
2226 | NFS_INO_INVALID_ACL
2227 | NFS_INO_INVALID_XATTR;
2228 /* Force revalidate of all attributes */
2229 save_cache_validity |= NFS_INO_INVALID_CTIME
2230 | NFS_INO_INVALID_MTIME
2231 | NFS_INO_INVALID_SIZE
2232 | NFS_INO_INVALID_BLOCKS
2233 | NFS_INO_INVALID_NLINK
2234 | NFS_INO_INVALID_MODE
2235 | NFS_INO_INVALID_OTHER;
2236 if (S_ISDIR(inode->i_mode))
2237 nfs_force_lookup_revalidate(inode);
2238 attr_changed = true;
2239 dprintk("NFS: change_attr change on server for file %s/%ld\n",
2240 inode->i_sb->s_id,
2241 inode->i_ino);
2242 } else if (!have_delegation) {
2243 nfs_ooo_record(nfsi, fattr);
2244 nfs_ooo_merge(nfsi, inode_peek_iversion_raw(inode),
2245 fattr->change_attr);
2246 }
2247 inode_set_iversion_raw(inode, fattr->change_attr);
2248 }
2249 } else {
2250 nfsi->cache_validity |=
2251 save_cache_validity & NFS_INO_INVALID_CHANGE;
2252 if (!have_delegation ||
2253 (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0)
2254 cache_revalidated = false;
2255 }
2256
2257 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
2258 inode_set_mtime_to_ts(inode, fattr->mtime);
2259 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
2260 nfsi->cache_validity |=
2261 save_cache_validity & NFS_INO_INVALID_MTIME;
2262
2263 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
2264 inode_set_ctime_to_ts(inode, fattr->ctime);
2265 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
2266 nfsi->cache_validity |=
2267 save_cache_validity & NFS_INO_INVALID_CTIME;
2268
2269 /* Check if our cached file size is stale */
2270 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
2271 new_isize = nfs_size_to_loff_t(fattr->size);
2272 cur_isize = i_size_read(inode);
2273 if (new_isize != cur_isize && !have_delegation) {
2274 /* Do we perhaps have any outstanding writes, or has
2275 * the file grown beyond our last write? */
2276 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
2277 trace_nfs_size_update(inode, new_isize);
2278 i_size_write(inode, new_isize);
2279 if (!have_writers)
2280 invalid |= NFS_INO_INVALID_DATA;
2281 }
2282 }
2283 if (new_isize == 0 &&
2284 !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED |
2285 NFS_ATTR_FATTR_BLOCKS_USED))) {
2286 fattr->du.nfs3.used = 0;
2287 fattr->valid |= NFS_ATTR_FATTR_SPACE_USED;
2288 }
2289 } else
2290 nfsi->cache_validity |=
2291 save_cache_validity & NFS_INO_INVALID_SIZE;
2292
2293 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
2294 inode_set_atime_to_ts(inode, fattr->atime);
2295 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
2296 nfsi->cache_validity |=
2297 save_cache_validity & NFS_INO_INVALID_ATIME;
2298
2299 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2300 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
2301 umode_t newmode = inode->i_mode & S_IFMT;
2302 newmode |= fattr->mode & S_IALLUGO;
2303 inode->i_mode = newmode;
2304 invalid |= NFS_INO_INVALID_ACCESS
2305 | NFS_INO_INVALID_ACL;
2306 }
2307 } else if (fattr_supported & NFS_ATTR_FATTR_MODE)
2308 nfsi->cache_validity |=
2309 save_cache_validity & NFS_INO_INVALID_MODE;
2310
2311 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2312 if (!uid_eq(inode->i_uid, fattr->uid)) {
2313 invalid |= NFS_INO_INVALID_ACCESS
2314 | NFS_INO_INVALID_ACL;
2315 inode->i_uid = fattr->uid;
2316 }
2317 } else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
2318 nfsi->cache_validity |=
2319 save_cache_validity & NFS_INO_INVALID_OTHER;
2320
2321 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2322 if (!gid_eq(inode->i_gid, fattr->gid)) {
2323 invalid |= NFS_INO_INVALID_ACCESS
2324 | NFS_INO_INVALID_ACL;
2325 inode->i_gid = fattr->gid;
2326 }
2327 } else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
2328 nfsi->cache_validity |=
2329 save_cache_validity & NFS_INO_INVALID_OTHER;
2330
2331 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2332 if (inode->i_nlink != fattr->nlink)
2333 set_nlink(inode, fattr->nlink);
2334 } else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
2335 nfsi->cache_validity |=
2336 save_cache_validity & NFS_INO_INVALID_NLINK;
2337
2338 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2339 /*
2340 * report the blocks in 512byte units
2341 */
2342 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2343 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED)
2344 nfsi->cache_validity |=
2345 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2346
2347 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2348 inode->i_blocks = fattr->du.nfs2.blocks;
2349 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED)
2350 nfsi->cache_validity |=
2351 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2352
2353 /* Update attrtimeo value if we're out of the unstable period */
2354 if (attr_changed) {
2355 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2356 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2357 nfsi->attrtimeo_timestamp = now;
2358 /* Set barrier to be more recent than all outstanding updates */
2359 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2360 } else {
2361 if (cache_revalidated) {
2362 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2363 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2364 nfsi->attrtimeo <<= 1;
2365 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2366 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2367 }
2368 nfsi->attrtimeo_timestamp = now;
2369 }
2370 /* Set the barrier to be more recent than this fattr */
2371 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
2372 nfsi->attr_gencount = fattr->gencount;
2373 }
2374
2375 /* Don't invalidate the data if we were to blame */
2376 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2377 || S_ISLNK(inode->i_mode)))
2378 invalid &= ~NFS_INO_INVALID_DATA;
2379 nfs_set_cache_invalid(inode, invalid);
2380
2381 return 0;
2382 out_err:
2383 /*
2384 * No need to worry about unhashing the dentry, as the
2385 * lookup validation will know that the inode is bad.
2386 * (But we fall through to invalidate the caches.)
2387 */
2388 nfs_set_inode_stale_locked(inode);
2389 return -ESTALE;
2390 }
2391
nfs_alloc_inode(struct super_block * sb)2392 struct inode *nfs_alloc_inode(struct super_block *sb)
2393 {
2394 struct nfs_inode *nfsi;
2395 nfsi = alloc_inode_sb(sb, nfs_inode_cachep, GFP_KERNEL);
2396 if (!nfsi)
2397 return NULL;
2398 nfsi->flags = 0UL;
2399 nfsi->cache_validity = 0UL;
2400 nfsi->ooo = NULL;
2401 #if IS_ENABLED(CONFIG_NFS_V4)
2402 nfsi->nfs4_acl = NULL;
2403 #endif /* CONFIG_NFS_V4 */
2404 #ifdef CONFIG_NFS_V4_2
2405 nfsi->xattr_cache = NULL;
2406 #endif
2407 nfs_netfs_inode_init(nfsi);
2408
2409 return &nfsi->vfs_inode;
2410 }
2411 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2412
nfs_free_inode(struct inode * inode)2413 void nfs_free_inode(struct inode *inode)
2414 {
2415 kfree(NFS_I(inode)->ooo);
2416 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2417 }
2418 EXPORT_SYMBOL_GPL(nfs_free_inode);
2419
nfs4_init_once(struct nfs_inode * nfsi)2420 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2421 {
2422 #if IS_ENABLED(CONFIG_NFS_V4)
2423 INIT_LIST_HEAD(&nfsi->open_states);
2424 nfsi->delegation = NULL;
2425 init_rwsem(&nfsi->rwsem);
2426 nfsi->layout = NULL;
2427 #endif
2428 }
2429
init_once(void * foo)2430 static void init_once(void *foo)
2431 {
2432 struct nfs_inode *nfsi = foo;
2433
2434 inode_init_once(&nfsi->vfs_inode);
2435 INIT_LIST_HEAD(&nfsi->open_files);
2436 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2437 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2438 nfs4_init_once(nfsi);
2439 }
2440
nfs_init_inodecache(void)2441 static int __init nfs_init_inodecache(void)
2442 {
2443 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2444 sizeof(struct nfs_inode),
2445 0, (SLAB_RECLAIM_ACCOUNT|
2446 SLAB_ACCOUNT),
2447 init_once);
2448 if (nfs_inode_cachep == NULL)
2449 return -ENOMEM;
2450
2451 return 0;
2452 }
2453
nfs_destroy_inodecache(void)2454 static void nfs_destroy_inodecache(void)
2455 {
2456 /*
2457 * Make sure all delayed rcu free inodes are flushed before we
2458 * destroy cache.
2459 */
2460 rcu_barrier();
2461 kmem_cache_destroy(nfs_inode_cachep);
2462 }
2463
2464 struct workqueue_struct *nfsiod_workqueue;
2465 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2466
2467 /*
2468 * start up the nfsiod workqueue
2469 */
nfsiod_start(void)2470 static int nfsiod_start(void)
2471 {
2472 struct workqueue_struct *wq;
2473 dprintk("RPC: creating workqueue nfsiod\n");
2474 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2475 if (wq == NULL)
2476 return -ENOMEM;
2477 nfsiod_workqueue = wq;
2478 return 0;
2479 }
2480
2481 /*
2482 * Destroy the nfsiod workqueue
2483 */
nfsiod_stop(void)2484 static void nfsiod_stop(void)
2485 {
2486 struct workqueue_struct *wq;
2487
2488 wq = nfsiod_workqueue;
2489 if (wq == NULL)
2490 return;
2491 nfsiod_workqueue = NULL;
2492 destroy_workqueue(wq);
2493 }
2494
2495 unsigned int nfs_net_id;
2496 EXPORT_SYMBOL_GPL(nfs_net_id);
2497
nfs_net_init(struct net * net)2498 static int nfs_net_init(struct net *net)
2499 {
2500 struct nfs_net *nn = net_generic(net, nfs_net_id);
2501
2502 nfs_clients_init(net);
2503
2504 if (!rpc_proc_register(net, &nn->rpcstats)) {
2505 nfs_clients_exit(net);
2506 return -ENOMEM;
2507 }
2508
2509 return nfs_fs_proc_net_init(net);
2510 }
2511
nfs_net_exit(struct net * net)2512 static void nfs_net_exit(struct net *net)
2513 {
2514 rpc_proc_unregister(net, "nfs");
2515 nfs_fs_proc_net_exit(net);
2516 nfs_clients_exit(net);
2517 }
2518
2519 static struct pernet_operations nfs_net_ops = {
2520 .init = nfs_net_init,
2521 .exit = nfs_net_exit,
2522 .id = &nfs_net_id,
2523 .size = sizeof(struct nfs_net),
2524 };
2525
2526 /*
2527 * Initialize NFS
2528 */
init_nfs_fs(void)2529 static int __init init_nfs_fs(void)
2530 {
2531 int err;
2532
2533 err = nfs_sysfs_init();
2534 if (err < 0)
2535 goto out10;
2536
2537 err = register_pernet_subsys(&nfs_net_ops);
2538 if (err < 0)
2539 goto out9;
2540
2541 err = nfsiod_start();
2542 if (err)
2543 goto out7;
2544
2545 err = nfs_fs_proc_init();
2546 if (err)
2547 goto out6;
2548
2549 err = nfs_init_nfspagecache();
2550 if (err)
2551 goto out5;
2552
2553 err = nfs_init_inodecache();
2554 if (err)
2555 goto out4;
2556
2557 err = nfs_init_readpagecache();
2558 if (err)
2559 goto out3;
2560
2561 err = nfs_init_writepagecache();
2562 if (err)
2563 goto out2;
2564
2565 err = nfs_init_directcache();
2566 if (err)
2567 goto out1;
2568
2569 err = register_nfs_fs();
2570 if (err)
2571 goto out0;
2572
2573 return 0;
2574 out0:
2575 nfs_destroy_directcache();
2576 out1:
2577 nfs_destroy_writepagecache();
2578 out2:
2579 nfs_destroy_readpagecache();
2580 out3:
2581 nfs_destroy_inodecache();
2582 out4:
2583 nfs_destroy_nfspagecache();
2584 out5:
2585 nfs_fs_proc_exit();
2586 out6:
2587 nfsiod_stop();
2588 out7:
2589 unregister_pernet_subsys(&nfs_net_ops);
2590 out9:
2591 nfs_sysfs_exit();
2592 out10:
2593 return err;
2594 }
2595
exit_nfs_fs(void)2596 static void __exit exit_nfs_fs(void)
2597 {
2598 nfs_destroy_directcache();
2599 nfs_destroy_writepagecache();
2600 nfs_destroy_readpagecache();
2601 nfs_destroy_inodecache();
2602 nfs_destroy_nfspagecache();
2603 unregister_pernet_subsys(&nfs_net_ops);
2604 unregister_nfs_fs();
2605 nfs_fs_proc_exit();
2606 nfsiod_stop();
2607 nfs_sysfs_exit();
2608 }
2609
2610 /* Not quite true; I just maintain it */
2611 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2612 MODULE_DESCRIPTION("NFS client support");
2613 MODULE_LICENSE("GPL");
2614 module_param(enable_ino64, bool, 0644);
2615
2616 module_init(init_nfs_fs)
2617 module_exit(exit_nfs_fs)
2618