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