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_ooo_clear(nfsi);
214 } else if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
215 nfs_ooo_clear(nfsi);
216 }
217 trace_nfs_set_cache_invalid(inode, 0);
218 }
219 EXPORT_SYMBOL_GPL(nfs_set_cache_invalid);
220
221 /*
222 * Invalidate the local caches
223 */
nfs_zap_caches_locked(struct inode * inode)224 static void nfs_zap_caches_locked(struct inode *inode)
225 {
226 struct nfs_inode *nfsi = NFS_I(inode);
227 int mode = inode->i_mode;
228
229 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
230
231 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
232 nfsi->attrtimeo_timestamp = jiffies;
233
234 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
235 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
236 NFS_INO_INVALID_DATA |
237 NFS_INO_INVALID_ACCESS |
238 NFS_INO_INVALID_ACL |
239 NFS_INO_INVALID_XATTR);
240 else
241 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
242 NFS_INO_INVALID_ACCESS |
243 NFS_INO_INVALID_ACL |
244 NFS_INO_INVALID_XATTR);
245 nfs_zap_label_cache_locked(nfsi);
246 }
247
nfs_zap_caches(struct inode * inode)248 void nfs_zap_caches(struct inode *inode)
249 {
250 spin_lock(&inode->i_lock);
251 nfs_zap_caches_locked(inode);
252 spin_unlock(&inode->i_lock);
253 }
254
nfs_zap_mapping(struct inode * inode,struct address_space * mapping)255 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
256 {
257 if (mapping->nrpages != 0) {
258 spin_lock(&inode->i_lock);
259 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
260 spin_unlock(&inode->i_lock);
261 }
262 }
263
nfs_zap_acl_cache(struct inode * inode)264 void nfs_zap_acl_cache(struct inode *inode)
265 {
266 void (*clear_acl_cache)(struct inode *);
267
268 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
269 if (clear_acl_cache != NULL)
270 clear_acl_cache(inode);
271 spin_lock(&inode->i_lock);
272 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
273 spin_unlock(&inode->i_lock);
274 }
275 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
276
nfs_invalidate_atime(struct inode * inode)277 void nfs_invalidate_atime(struct inode *inode)
278 {
279 spin_lock(&inode->i_lock);
280 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
281 spin_unlock(&inode->i_lock);
282 }
283 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
284
285 /*
286 * Invalidate, but do not unhash, the inode.
287 * NB: must be called with inode->i_lock held!
288 */
nfs_set_inode_stale_locked(struct inode * inode)289 static void nfs_set_inode_stale_locked(struct inode *inode)
290 {
291 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
292 nfs_zap_caches_locked(inode);
293 trace_nfs_set_inode_stale(inode);
294 }
295
nfs_set_inode_stale(struct inode * inode)296 void nfs_set_inode_stale(struct inode *inode)
297 {
298 spin_lock(&inode->i_lock);
299 nfs_set_inode_stale_locked(inode);
300 spin_unlock(&inode->i_lock);
301 }
302
303 struct nfs_find_desc {
304 struct nfs_fh *fh;
305 struct nfs_fattr *fattr;
306 };
307
308 /*
309 * In NFSv3 we can have 64bit inode numbers. In order to support
310 * this, and re-exported directories (also seen in NFSv2)
311 * we are forced to allow 2 different inodes to have the same
312 * i_ino.
313 */
314 static int
nfs_find_actor(struct inode * inode,void * opaque)315 nfs_find_actor(struct inode *inode, void *opaque)
316 {
317 struct nfs_find_desc *desc = opaque;
318 struct nfs_fh *fh = desc->fh;
319 struct nfs_fattr *fattr = desc->fattr;
320
321 if (NFS_FILEID(inode) != fattr->fileid)
322 return 0;
323 if (inode_wrong_type(inode, fattr->mode))
324 return 0;
325 if (nfs_compare_fh(NFS_FH(inode), fh))
326 return 0;
327 if (is_bad_inode(inode) || NFS_STALE(inode))
328 return 0;
329 return 1;
330 }
331
332 static int
nfs_init_locked(struct inode * inode,void * opaque)333 nfs_init_locked(struct inode *inode, void *opaque)
334 {
335 struct nfs_find_desc *desc = opaque;
336 struct nfs_fattr *fattr = desc->fattr;
337
338 set_nfs_fileid(inode, fattr->fileid);
339 inode->i_mode = fattr->mode;
340 nfs_copy_fh(NFS_FH(inode), desc->fh);
341 return 0;
342 }
343
344 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
nfs_clear_label_invalid(struct inode * inode)345 static void nfs_clear_label_invalid(struct inode *inode)
346 {
347 spin_lock(&inode->i_lock);
348 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
349 spin_unlock(&inode->i_lock);
350 }
351
nfs_setsecurity(struct inode * inode,struct nfs_fattr * fattr)352 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr)
353 {
354 int error;
355
356 if (fattr->label == NULL)
357 return;
358
359 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
360 error = security_inode_notifysecctx(inode, fattr->label->label,
361 fattr->label->len);
362 if (error)
363 printk(KERN_ERR "%s() %s %d "
364 "security_inode_notifysecctx() %d\n",
365 __func__,
366 (char *)fattr->label->label,
367 fattr->label->len, error);
368 nfs_clear_label_invalid(inode);
369 }
370 }
371
nfs4_label_alloc(struct nfs_server * server,gfp_t flags)372 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
373 {
374 struct nfs4_label *label;
375
376 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
377 return NULL;
378
379 label = kzalloc(sizeof(struct nfs4_label), flags);
380 if (label == NULL)
381 return ERR_PTR(-ENOMEM);
382
383 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
384 if (label->label == NULL) {
385 kfree(label);
386 return ERR_PTR(-ENOMEM);
387 }
388 label->len = NFS4_MAXLABELLEN;
389
390 return label;
391 }
392 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
393 #else
nfs_setsecurity(struct inode * inode,struct nfs_fattr * fattr)394 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr)
395 {
396 }
397 #endif
398 EXPORT_SYMBOL_GPL(nfs_setsecurity);
399
400 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
401 struct inode *
nfs_ilookup(struct super_block * sb,struct nfs_fattr * fattr,struct nfs_fh * fh)402 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
403 {
404 struct nfs_find_desc desc = {
405 .fh = fh,
406 .fattr = fattr,
407 };
408 struct inode *inode;
409 unsigned long hash;
410
411 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
412 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
413 return NULL;
414
415 hash = nfs_fattr_to_ino_t(fattr);
416 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
417
418 dprintk("%s: returning %p\n", __func__, inode);
419 return inode;
420 }
421
nfs_inode_init_regular(struct nfs_inode * nfsi)422 static void nfs_inode_init_regular(struct nfs_inode *nfsi)
423 {
424 atomic_long_set(&nfsi->nrequests, 0);
425 atomic_long_set(&nfsi->redirtied_pages, 0);
426 INIT_LIST_HEAD(&nfsi->commit_info.list);
427 atomic_long_set(&nfsi->commit_info.ncommit, 0);
428 atomic_set(&nfsi->commit_info.rpcs_out, 0);
429 mutex_init(&nfsi->commit_mutex);
430 }
431
nfs_inode_init_dir(struct nfs_inode * nfsi)432 static void nfs_inode_init_dir(struct nfs_inode *nfsi)
433 {
434 nfsi->cache_change_attribute = 0;
435 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
436 init_rwsem(&nfsi->rmdir_sem);
437 }
438
439 /*
440 * This is our front-end to iget that looks up inodes by file handle
441 * instead of inode number.
442 */
443 struct inode *
nfs_fhget(struct super_block * sb,struct nfs_fh * fh,struct nfs_fattr * fattr)444 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
445 {
446 struct nfs_find_desc desc = {
447 .fh = fh,
448 .fattr = fattr
449 };
450 struct inode *inode = ERR_PTR(-ENOENT);
451 u64 fattr_supported = NFS_SB(sb)->fattr_valid;
452 unsigned long hash;
453
454 nfs_attr_check_mountpoint(sb, fattr);
455
456 if (nfs_attr_use_mounted_on_fileid(fattr))
457 fattr->fileid = fattr->mounted_on_fileid;
458 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
459 goto out_no_inode;
460 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
461 goto out_no_inode;
462
463 hash = nfs_fattr_to_ino_t(fattr);
464
465 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
466 if (inode == NULL) {
467 inode = ERR_PTR(-ENOMEM);
468 goto out_no_inode;
469 }
470
471 if (inode->i_state & I_NEW) {
472 struct nfs_inode *nfsi = NFS_I(inode);
473 unsigned long now = jiffies;
474
475 /* We set i_ino for the few things that still rely on it,
476 * such as stat(2) */
477 inode->i_ino = hash;
478
479 /* We can't support update_atime(), since the server will reset it */
480 inode->i_flags |= S_NOATIME|S_NOCMTIME;
481 inode->i_mode = fattr->mode;
482 nfsi->cache_validity = 0;
483 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
484 && (fattr_supported & NFS_ATTR_FATTR_MODE))
485 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE);
486 /* Why so? Because we want revalidate for devices/FIFOs, and
487 * that's precisely what we have in nfs_file_inode_operations.
488 */
489 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
490 if (S_ISREG(inode->i_mode)) {
491 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
492 inode->i_data.a_ops = &nfs_file_aops;
493 nfs_inode_init_regular(nfsi);
494 } else if (S_ISDIR(inode->i_mode)) {
495 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
496 inode->i_fop = &nfs_dir_operations;
497 inode->i_data.a_ops = &nfs_dir_aops;
498 nfs_inode_init_dir(nfsi);
499 /* Deal with crossing mountpoints */
500 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
501 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
502 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
503 inode->i_op = &nfs_referral_inode_operations;
504 else
505 inode->i_op = &nfs_mountpoint_inode_operations;
506 inode->i_fop = NULL;
507 inode->i_flags |= S_AUTOMOUNT;
508 }
509 } else if (S_ISLNK(inode->i_mode)) {
510 inode->i_op = &nfs_symlink_inode_operations;
511 inode_nohighmem(inode);
512 } else
513 init_special_inode(inode, inode->i_mode, fattr->rdev);
514
515 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
516 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
517 inode_set_ctime(inode, 0, 0);
518 inode_set_iversion_raw(inode, 0);
519 inode->i_size = 0;
520 clear_nlink(inode);
521 inode->i_uid = make_kuid(&init_user_ns, -2);
522 inode->i_gid = make_kgid(&init_user_ns, -2);
523 inode->i_blocks = 0;
524 nfsi->write_io = 0;
525 nfsi->read_io = 0;
526
527 nfsi->read_cache_jiffies = fattr->time_start;
528 nfsi->attr_gencount = fattr->gencount;
529 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
530 inode->i_atime = fattr->atime;
531 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
532 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
533 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
534 inode->i_mtime = fattr->mtime;
535 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
536 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
537 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
538 inode_set_ctime_to_ts(inode, fattr->ctime);
539 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
540 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
541 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
542 inode_set_iversion_raw(inode, fattr->change_attr);
543 else
544 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
545 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
546 inode->i_size = nfs_size_to_loff_t(fattr->size);
547 else
548 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
549 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
550 set_nlink(inode, fattr->nlink);
551 else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
552 nfs_set_cache_invalid(inode, NFS_INO_INVALID_NLINK);
553 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
554 inode->i_uid = fattr->uid;
555 else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
556 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
557 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
558 inode->i_gid = fattr->gid;
559 else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
560 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
561 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
562 inode->i_blocks = fattr->du.nfs2.blocks;
563 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED &&
564 fattr->size != 0)
565 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
566 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
567 /*
568 * report the blocks in 512byte units
569 */
570 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
571 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED &&
572 fattr->size != 0)
573 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
574
575 nfs_setsecurity(inode, fattr);
576
577 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
578 nfsi->attrtimeo_timestamp = now;
579 nfsi->access_cache = RB_ROOT;
580
581 nfs_fscache_init_inode(inode);
582
583 unlock_new_inode(inode);
584 } else {
585 int err = nfs_refresh_inode(inode, fattr);
586 if (err < 0) {
587 iput(inode);
588 inode = ERR_PTR(err);
589 goto out_no_inode;
590 }
591 }
592 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
593 inode->i_sb->s_id,
594 (unsigned long long)NFS_FILEID(inode),
595 nfs_display_fhandle_hash(fh),
596 atomic_read(&inode->i_count));
597
598 out:
599 return inode;
600
601 out_no_inode:
602 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
603 goto out;
604 }
605 EXPORT_SYMBOL_GPL(nfs_fhget);
606
607 #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)
608
609 int
nfs_setattr(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * attr)610 nfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
611 struct iattr *attr)
612 {
613 struct inode *inode = d_inode(dentry);
614 struct nfs_fattr *fattr;
615 int error = 0;
616
617 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
618
619 /* skip mode change if it's just for clearing setuid/setgid */
620 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
621 attr->ia_valid &= ~ATTR_MODE;
622
623 if (attr->ia_valid & ATTR_SIZE) {
624 BUG_ON(!S_ISREG(inode->i_mode));
625
626 error = inode_newsize_ok(inode, attr->ia_size);
627 if (error)
628 return error;
629
630 if (attr->ia_size == i_size_read(inode))
631 attr->ia_valid &= ~ATTR_SIZE;
632 }
633
634 /* Optimization: if the end result is no change, don't RPC */
635 if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0)
636 return 0;
637
638 trace_nfs_setattr_enter(inode);
639
640 /* Write all dirty data */
641 if (S_ISREG(inode->i_mode))
642 nfs_sync_inode(inode);
643
644 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
645 if (fattr == NULL) {
646 error = -ENOMEM;
647 goto out;
648 }
649
650 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
651 if (error == 0)
652 error = nfs_refresh_inode(inode, fattr);
653 nfs_free_fattr(fattr);
654 out:
655 trace_nfs_setattr_exit(inode, error);
656 return error;
657 }
658 EXPORT_SYMBOL_GPL(nfs_setattr);
659
660 /**
661 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
662 * @inode: inode of the file used
663 * @offset: file offset to start truncating
664 *
665 * This is a copy of the common vmtruncate, but with the locking
666 * corrected to take into account the fact that NFS requires
667 * inode->i_size to be updated under the inode->i_lock.
668 * Note: must be called with inode->i_lock held!
669 */
nfs_vmtruncate(struct inode * inode,loff_t offset)670 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
671 {
672 int err;
673
674 err = inode_newsize_ok(inode, offset);
675 if (err)
676 goto out;
677
678 trace_nfs_size_truncate(inode, offset);
679 i_size_write(inode, offset);
680 /* Optimisation */
681 if (offset == 0) {
682 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
683 nfs_ooo_clear(NFS_I(inode));
684 }
685 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
686
687 spin_unlock(&inode->i_lock);
688 truncate_pagecache(inode, offset);
689 spin_lock(&inode->i_lock);
690 out:
691 return err;
692 }
693
694 /**
695 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
696 * @inode: pointer to struct inode
697 * @attr: pointer to struct iattr
698 * @fattr: pointer to struct nfs_fattr
699 *
700 * Note: we do this in the *proc.c in order to ensure that
701 * it works for things like exclusive creates too.
702 */
nfs_setattr_update_inode(struct inode * inode,struct iattr * attr,struct nfs_fattr * fattr)703 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
704 struct nfs_fattr *fattr)
705 {
706 /* Barrier: bump the attribute generation count. */
707 nfs_fattr_set_barrier(fattr);
708
709 spin_lock(&inode->i_lock);
710 NFS_I(inode)->attr_gencount = fattr->gencount;
711 if ((attr->ia_valid & ATTR_SIZE) != 0) {
712 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME |
713 NFS_INO_INVALID_BLOCKS);
714 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
715 nfs_vmtruncate(inode, attr->ia_size);
716 }
717 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
718 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
719 if ((attr->ia_valid & ATTR_KILL_SUID) != 0 &&
720 inode->i_mode & S_ISUID)
721 inode->i_mode &= ~S_ISUID;
722 if (setattr_should_drop_sgid(&nop_mnt_idmap, inode))
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_set_ctime_to_ts(inode, 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_set_ctime_to_ts(inode, 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_set_ctime_to_ts(inode, 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 |
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, request_mask, 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 nfs_ooo_test(nfsi))
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 &= ~NFS_INO_INVALID_DATA;
1357 nfs_ooo_clear(nfsi);
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_get_ctime(inode);
1448 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1449 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1450 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1451 inode_set_ctime_to_ts(inode, 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_get_ctime(inode);
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_ooo_merge(struct nfs_inode * nfsi,u64 start,u64 end)1819 static void nfs_ooo_merge(struct nfs_inode *nfsi,
1820 u64 start, u64 end)
1821 {
1822 int i, cnt;
1823
1824 if (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)
1825 /* No point merging anything */
1826 return;
1827
1828 if (!nfsi->ooo) {
1829 nfsi->ooo = kmalloc(sizeof(*nfsi->ooo), GFP_ATOMIC);
1830 if (!nfsi->ooo) {
1831 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1832 return;
1833 }
1834 nfsi->ooo->cnt = 0;
1835 }
1836
1837 /* add this range, merging if possible */
1838 cnt = nfsi->ooo->cnt;
1839 for (i = 0; i < cnt; i++) {
1840 if (end == nfsi->ooo->gap[i].start)
1841 end = nfsi->ooo->gap[i].end;
1842 else if (start == nfsi->ooo->gap[i].end)
1843 start = nfsi->ooo->gap[i].start;
1844 else
1845 continue;
1846 /* Remove 'i' from table and loop to insert the new range */
1847 cnt -= 1;
1848 nfsi->ooo->gap[i] = nfsi->ooo->gap[cnt];
1849 i = -1;
1850 }
1851 if (start != end) {
1852 if (cnt >= ARRAY_SIZE(nfsi->ooo->gap)) {
1853 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1854 kfree(nfsi->ooo);
1855 nfsi->ooo = NULL;
1856 return;
1857 }
1858 nfsi->ooo->gap[cnt].start = start;
1859 nfsi->ooo->gap[cnt].end = end;
1860 cnt += 1;
1861 }
1862 nfsi->ooo->cnt = cnt;
1863 }
1864
nfs_ooo_record(struct nfs_inode * nfsi,struct nfs_fattr * fattr)1865 static void nfs_ooo_record(struct nfs_inode *nfsi,
1866 struct nfs_fattr *fattr)
1867 {
1868 /* This reply was out-of-order, so record in the
1869 * pre/post change id, possibly cancelling
1870 * gaps created when iversion was jumpped forward.
1871 */
1872 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) &&
1873 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE))
1874 nfs_ooo_merge(nfsi,
1875 fattr->change_attr,
1876 fattr->pre_change_attr);
1877 }
1878
nfs_refresh_inode_locked(struct inode * inode,struct nfs_fattr * fattr)1879 static int nfs_refresh_inode_locked(struct inode *inode,
1880 struct nfs_fattr *fattr)
1881 {
1882 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
1883 int ret = 0;
1884
1885 trace_nfs_refresh_inode_enter(inode);
1886
1887 if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode))
1888 ret = nfs_update_inode(inode, fattr);
1889 else {
1890 nfs_ooo_record(NFS_I(inode), fattr);
1891
1892 if (attr_cmp == 0)
1893 ret = nfs_check_inode_attributes(inode, fattr);
1894 }
1895
1896 trace_nfs_refresh_inode_exit(inode, ret);
1897 return ret;
1898 }
1899
1900 /**
1901 * nfs_refresh_inode - try to update the inode attribute cache
1902 * @inode: pointer to inode
1903 * @fattr: updated attributes
1904 *
1905 * Check that an RPC call that returned attributes has not overlapped with
1906 * other recent updates of the inode metadata, then decide whether it is
1907 * safe to do a full update of the inode attributes, or whether just to
1908 * call nfs_check_inode_attributes.
1909 */
nfs_refresh_inode(struct inode * inode,struct nfs_fattr * fattr)1910 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1911 {
1912 int status;
1913
1914 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1915 return 0;
1916 spin_lock(&inode->i_lock);
1917 status = nfs_refresh_inode_locked(inode, fattr);
1918 spin_unlock(&inode->i_lock);
1919
1920 return status;
1921 }
1922 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1923
nfs_post_op_update_inode_locked(struct inode * inode,struct nfs_fattr * fattr,unsigned int invalid)1924 static int nfs_post_op_update_inode_locked(struct inode *inode,
1925 struct nfs_fattr *fattr, unsigned int invalid)
1926 {
1927 if (S_ISDIR(inode->i_mode))
1928 invalid |= NFS_INO_INVALID_DATA;
1929 nfs_set_cache_invalid(inode, invalid);
1930 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1931 return 0;
1932 return nfs_refresh_inode_locked(inode, fattr);
1933 }
1934
1935 /**
1936 * nfs_post_op_update_inode - try to update the inode attribute cache
1937 * @inode: pointer to inode
1938 * @fattr: updated attributes
1939 *
1940 * After an operation that has changed the inode metadata, mark the
1941 * attribute cache as being invalid, then try to update it.
1942 *
1943 * NB: if the server didn't return any post op attributes, this
1944 * function will force the retrieval of attributes before the next
1945 * NFS request. Thus it should be used only for operations that
1946 * are expected to change one or more attributes, to avoid
1947 * unnecessary NFS requests and trips through nfs_update_inode().
1948 */
nfs_post_op_update_inode(struct inode * inode,struct nfs_fattr * fattr)1949 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1950 {
1951 int status;
1952
1953 spin_lock(&inode->i_lock);
1954 nfs_fattr_set_barrier(fattr);
1955 status = nfs_post_op_update_inode_locked(inode, fattr,
1956 NFS_INO_INVALID_CHANGE
1957 | NFS_INO_INVALID_CTIME
1958 | NFS_INO_REVAL_FORCED);
1959 spin_unlock(&inode->i_lock);
1960
1961 return status;
1962 }
1963 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1964
1965 /**
1966 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1967 * @inode: pointer to inode
1968 * @fattr: updated attributes
1969 *
1970 * After an operation that has changed the inode metadata, mark the
1971 * attribute cache as being invalid, then try to update it. Fake up
1972 * weak cache consistency data, if none exist.
1973 *
1974 * This function is mainly designed to be used by the ->write_done() functions.
1975 */
nfs_post_op_update_inode_force_wcc_locked(struct inode * inode,struct nfs_fattr * fattr)1976 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1977 {
1978 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
1979 int status;
1980
1981 /* Don't do a WCC update if these attributes are already stale */
1982 if (attr_cmp < 0)
1983 return 0;
1984 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) {
1985 /* Record the pre/post change info before clearing PRECHANGE */
1986 nfs_ooo_record(NFS_I(inode), fattr);
1987 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1988 | NFS_ATTR_FATTR_PRESIZE
1989 | NFS_ATTR_FATTR_PREMTIME
1990 | NFS_ATTR_FATTR_PRECTIME);
1991 goto out_noforce;
1992 }
1993 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1994 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1995 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1996 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1997 }
1998 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1999 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
2000 fattr->pre_ctime = inode_get_ctime(inode);
2001 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
2002 }
2003 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
2004 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
2005 fattr->pre_mtime = inode->i_mtime;
2006 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
2007 }
2008 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
2009 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
2010 fattr->pre_size = i_size_read(inode);
2011 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
2012 }
2013 out_noforce:
2014 status = nfs_post_op_update_inode_locked(inode, fattr,
2015 NFS_INO_INVALID_CHANGE
2016 | NFS_INO_INVALID_CTIME
2017 | NFS_INO_INVALID_MTIME
2018 | NFS_INO_INVALID_BLOCKS);
2019 return status;
2020 }
2021
2022 /**
2023 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
2024 * @inode: pointer to inode
2025 * @fattr: updated attributes
2026 *
2027 * After an operation that has changed the inode metadata, mark the
2028 * attribute cache as being invalid, then try to update it. Fake up
2029 * weak cache consistency data, if none exist.
2030 *
2031 * This function is mainly designed to be used by the ->write_done() functions.
2032 */
nfs_post_op_update_inode_force_wcc(struct inode * inode,struct nfs_fattr * fattr)2033 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
2034 {
2035 int status;
2036
2037 spin_lock(&inode->i_lock);
2038 nfs_fattr_set_barrier(fattr);
2039 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
2040 spin_unlock(&inode->i_lock);
2041 return status;
2042 }
2043 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
2044
2045
2046 /*
2047 * Many nfs protocol calls return the new file attributes after
2048 * an operation. Here we update the inode to reflect the state
2049 * of the server's inode.
2050 *
2051 * This is a bit tricky because we have to make sure all dirty pages
2052 * have been sent off to the server before calling invalidate_inode_pages.
2053 * To make sure no other process adds more write requests while we try
2054 * our best to flush them, we make them sleep during the attribute refresh.
2055 *
2056 * A very similar scenario holds for the dir cache.
2057 */
nfs_update_inode(struct inode * inode,struct nfs_fattr * fattr)2058 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2059 {
2060 struct nfs_server *server = NFS_SERVER(inode);
2061 struct nfs_inode *nfsi = NFS_I(inode);
2062 loff_t cur_isize, new_isize;
2063 u64 fattr_supported = server->fattr_valid;
2064 unsigned long invalid = 0;
2065 unsigned long now = jiffies;
2066 unsigned long save_cache_validity;
2067 bool have_writers = nfs_file_has_buffered_writers(nfsi);
2068 bool cache_revalidated = true;
2069 bool attr_changed = false;
2070 bool have_delegation;
2071
2072 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
2073 __func__, inode->i_sb->s_id, inode->i_ino,
2074 nfs_display_fhandle_hash(NFS_FH(inode)),
2075 atomic_read(&inode->i_count), fattr->valid);
2076
2077 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
2078 /* Only a mounted-on-fileid? Just exit */
2079 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
2080 return 0;
2081 /* Has the inode gone and changed behind our back? */
2082 } else if (nfsi->fileid != fattr->fileid) {
2083 /* Is this perhaps the mounted-on fileid? */
2084 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
2085 nfsi->fileid == fattr->mounted_on_fileid)
2086 return 0;
2087 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
2088 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
2089 NFS_SERVER(inode)->nfs_client->cl_hostname,
2090 inode->i_sb->s_id, (long long)nfsi->fileid,
2091 (long long)fattr->fileid);
2092 goto out_err;
2093 }
2094
2095 /*
2096 * Make sure the inode's type hasn't changed.
2097 */
2098 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
2099 /*
2100 * Big trouble! The inode has become a different object.
2101 */
2102 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
2103 __func__, inode->i_ino, inode->i_mode, fattr->mode);
2104 goto out_err;
2105 }
2106
2107 /* Update the fsid? */
2108 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
2109 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
2110 !IS_AUTOMOUNT(inode))
2111 server->fsid = fattr->fsid;
2112
2113 /* Save the delegation state before clearing cache_validity */
2114 have_delegation = nfs_have_delegated_attributes(inode);
2115
2116 /*
2117 * Update the read time so we don't revalidate too often.
2118 */
2119 nfsi->read_cache_jiffies = fattr->time_start;
2120
2121 save_cache_validity = nfsi->cache_validity;
2122 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
2123 | NFS_INO_INVALID_ATIME
2124 | NFS_INO_REVAL_FORCED
2125 | NFS_INO_INVALID_BLOCKS);
2126
2127 /* Do atomic weak cache consistency updates */
2128 nfs_wcc_update_inode(inode, fattr);
2129
2130 if (pnfs_layoutcommit_outstanding(inode)) {
2131 nfsi->cache_validity |=
2132 save_cache_validity &
2133 (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
2134 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
2135 NFS_INO_INVALID_BLOCKS);
2136 cache_revalidated = false;
2137 }
2138
2139 /* More cache consistency checks */
2140 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
2141 if (!have_writers && nfsi->ooo && nfsi->ooo->cnt == 1 &&
2142 nfsi->ooo->gap[0].end == inode_peek_iversion_raw(inode)) {
2143 /* There is one remaining gap that hasn't been
2144 * merged into iversion - do that now.
2145 */
2146 inode_set_iversion_raw(inode, nfsi->ooo->gap[0].start);
2147 kfree(nfsi->ooo);
2148 nfsi->ooo = NULL;
2149 }
2150 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
2151 /* Could it be a race with writeback? */
2152 if (!(have_writers || have_delegation)) {
2153 invalid |= NFS_INO_INVALID_DATA
2154 | NFS_INO_INVALID_ACCESS
2155 | NFS_INO_INVALID_ACL
2156 | NFS_INO_INVALID_XATTR;
2157 /* Force revalidate of all attributes */
2158 save_cache_validity |= NFS_INO_INVALID_CTIME
2159 | NFS_INO_INVALID_MTIME
2160 | NFS_INO_INVALID_SIZE
2161 | NFS_INO_INVALID_BLOCKS
2162 | NFS_INO_INVALID_NLINK
2163 | NFS_INO_INVALID_MODE
2164 | NFS_INO_INVALID_OTHER;
2165 if (S_ISDIR(inode->i_mode))
2166 nfs_force_lookup_revalidate(inode);
2167 attr_changed = true;
2168 dprintk("NFS: change_attr change on server for file %s/%ld\n",
2169 inode->i_sb->s_id,
2170 inode->i_ino);
2171 } else if (!have_delegation) {
2172 nfs_ooo_record(nfsi, fattr);
2173 nfs_ooo_merge(nfsi, inode_peek_iversion_raw(inode),
2174 fattr->change_attr);
2175 }
2176 inode_set_iversion_raw(inode, fattr->change_attr);
2177 }
2178 } else {
2179 nfsi->cache_validity |=
2180 save_cache_validity & NFS_INO_INVALID_CHANGE;
2181 if (!have_delegation ||
2182 (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0)
2183 cache_revalidated = false;
2184 }
2185
2186 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
2187 inode->i_mtime = fattr->mtime;
2188 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
2189 nfsi->cache_validity |=
2190 save_cache_validity & NFS_INO_INVALID_MTIME;
2191
2192 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
2193 inode_set_ctime_to_ts(inode, fattr->ctime);
2194 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
2195 nfsi->cache_validity |=
2196 save_cache_validity & NFS_INO_INVALID_CTIME;
2197
2198 /* Check if our cached file size is stale */
2199 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
2200 new_isize = nfs_size_to_loff_t(fattr->size);
2201 cur_isize = i_size_read(inode);
2202 if (new_isize != cur_isize && !have_delegation) {
2203 /* Do we perhaps have any outstanding writes, or has
2204 * the file grown beyond our last write? */
2205 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
2206 trace_nfs_size_update(inode, new_isize);
2207 i_size_write(inode, new_isize);
2208 if (!have_writers)
2209 invalid |= NFS_INO_INVALID_DATA;
2210 }
2211 }
2212 if (new_isize == 0 &&
2213 !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED |
2214 NFS_ATTR_FATTR_BLOCKS_USED))) {
2215 fattr->du.nfs3.used = 0;
2216 fattr->valid |= NFS_ATTR_FATTR_SPACE_USED;
2217 }
2218 } else
2219 nfsi->cache_validity |=
2220 save_cache_validity & NFS_INO_INVALID_SIZE;
2221
2222 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
2223 inode->i_atime = fattr->atime;
2224 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
2225 nfsi->cache_validity |=
2226 save_cache_validity & NFS_INO_INVALID_ATIME;
2227
2228 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2229 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
2230 umode_t newmode = inode->i_mode & S_IFMT;
2231 newmode |= fattr->mode & S_IALLUGO;
2232 inode->i_mode = newmode;
2233 invalid |= NFS_INO_INVALID_ACCESS
2234 | NFS_INO_INVALID_ACL;
2235 }
2236 } else if (fattr_supported & NFS_ATTR_FATTR_MODE)
2237 nfsi->cache_validity |=
2238 save_cache_validity & NFS_INO_INVALID_MODE;
2239
2240 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2241 if (!uid_eq(inode->i_uid, fattr->uid)) {
2242 invalid |= NFS_INO_INVALID_ACCESS
2243 | NFS_INO_INVALID_ACL;
2244 inode->i_uid = fattr->uid;
2245 }
2246 } else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
2247 nfsi->cache_validity |=
2248 save_cache_validity & NFS_INO_INVALID_OTHER;
2249
2250 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2251 if (!gid_eq(inode->i_gid, fattr->gid)) {
2252 invalid |= NFS_INO_INVALID_ACCESS
2253 | NFS_INO_INVALID_ACL;
2254 inode->i_gid = fattr->gid;
2255 }
2256 } else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
2257 nfsi->cache_validity |=
2258 save_cache_validity & NFS_INO_INVALID_OTHER;
2259
2260 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2261 if (inode->i_nlink != fattr->nlink)
2262 set_nlink(inode, fattr->nlink);
2263 } else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
2264 nfsi->cache_validity |=
2265 save_cache_validity & NFS_INO_INVALID_NLINK;
2266
2267 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2268 /*
2269 * report the blocks in 512byte units
2270 */
2271 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2272 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED)
2273 nfsi->cache_validity |=
2274 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2275
2276 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2277 inode->i_blocks = fattr->du.nfs2.blocks;
2278 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED)
2279 nfsi->cache_validity |=
2280 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2281
2282 /* Update attrtimeo value if we're out of the unstable period */
2283 if (attr_changed) {
2284 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2285 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2286 nfsi->attrtimeo_timestamp = now;
2287 /* Set barrier to be more recent than all outstanding updates */
2288 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2289 } else {
2290 if (cache_revalidated) {
2291 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2292 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2293 nfsi->attrtimeo <<= 1;
2294 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2295 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2296 }
2297 nfsi->attrtimeo_timestamp = now;
2298 }
2299 /* Set the barrier to be more recent than this fattr */
2300 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
2301 nfsi->attr_gencount = fattr->gencount;
2302 }
2303
2304 /* Don't invalidate the data if we were to blame */
2305 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2306 || S_ISLNK(inode->i_mode)))
2307 invalid &= ~NFS_INO_INVALID_DATA;
2308 nfs_set_cache_invalid(inode, invalid);
2309
2310 return 0;
2311 out_err:
2312 /*
2313 * No need to worry about unhashing the dentry, as the
2314 * lookup validation will know that the inode is bad.
2315 * (But we fall through to invalidate the caches.)
2316 */
2317 nfs_set_inode_stale_locked(inode);
2318 return -ESTALE;
2319 }
2320
nfs_alloc_inode(struct super_block * sb)2321 struct inode *nfs_alloc_inode(struct super_block *sb)
2322 {
2323 struct nfs_inode *nfsi;
2324 nfsi = alloc_inode_sb(sb, nfs_inode_cachep, GFP_KERNEL);
2325 if (!nfsi)
2326 return NULL;
2327 nfsi->flags = 0UL;
2328 nfsi->cache_validity = 0UL;
2329 nfsi->ooo = NULL;
2330 #if IS_ENABLED(CONFIG_NFS_V4)
2331 nfsi->nfs4_acl = NULL;
2332 #endif /* CONFIG_NFS_V4 */
2333 #ifdef CONFIG_NFS_V4_2
2334 nfsi->xattr_cache = NULL;
2335 #endif
2336 nfs_netfs_inode_init(nfsi);
2337
2338 return &nfsi->vfs_inode;
2339 }
2340 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2341
nfs_free_inode(struct inode * inode)2342 void nfs_free_inode(struct inode *inode)
2343 {
2344 kfree(NFS_I(inode)->ooo);
2345 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2346 }
2347 EXPORT_SYMBOL_GPL(nfs_free_inode);
2348
nfs4_init_once(struct nfs_inode * nfsi)2349 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2350 {
2351 #if IS_ENABLED(CONFIG_NFS_V4)
2352 INIT_LIST_HEAD(&nfsi->open_states);
2353 nfsi->delegation = NULL;
2354 init_rwsem(&nfsi->rwsem);
2355 nfsi->layout = NULL;
2356 #endif
2357 }
2358
init_once(void * foo)2359 static void init_once(void *foo)
2360 {
2361 struct nfs_inode *nfsi = foo;
2362
2363 inode_init_once(&nfsi->vfs_inode);
2364 INIT_LIST_HEAD(&nfsi->open_files);
2365 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2366 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2367 nfs4_init_once(nfsi);
2368 }
2369
nfs_init_inodecache(void)2370 static int __init nfs_init_inodecache(void)
2371 {
2372 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2373 sizeof(struct nfs_inode),
2374 0, (SLAB_RECLAIM_ACCOUNT|
2375 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2376 init_once);
2377 if (nfs_inode_cachep == NULL)
2378 return -ENOMEM;
2379
2380 return 0;
2381 }
2382
nfs_destroy_inodecache(void)2383 static void nfs_destroy_inodecache(void)
2384 {
2385 /*
2386 * Make sure all delayed rcu free inodes are flushed before we
2387 * destroy cache.
2388 */
2389 rcu_barrier();
2390 kmem_cache_destroy(nfs_inode_cachep);
2391 }
2392
2393 struct workqueue_struct *nfsiod_workqueue;
2394 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2395
2396 /*
2397 * start up the nfsiod workqueue
2398 */
nfsiod_start(void)2399 static int nfsiod_start(void)
2400 {
2401 struct workqueue_struct *wq;
2402 dprintk("RPC: creating workqueue nfsiod\n");
2403 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2404 if (wq == NULL)
2405 return -ENOMEM;
2406 nfsiod_workqueue = wq;
2407 return 0;
2408 }
2409
2410 /*
2411 * Destroy the nfsiod workqueue
2412 */
nfsiod_stop(void)2413 static void nfsiod_stop(void)
2414 {
2415 struct workqueue_struct *wq;
2416
2417 wq = nfsiod_workqueue;
2418 if (wq == NULL)
2419 return;
2420 nfsiod_workqueue = NULL;
2421 destroy_workqueue(wq);
2422 }
2423
2424 unsigned int nfs_net_id;
2425 EXPORT_SYMBOL_GPL(nfs_net_id);
2426
nfs_net_init(struct net * net)2427 static int nfs_net_init(struct net *net)
2428 {
2429 struct nfs_net *nn = net_generic(net, nfs_net_id);
2430
2431 nfs_clients_init(net);
2432
2433 if (!rpc_proc_register(net, &nn->rpcstats)) {
2434 nfs_clients_exit(net);
2435 return -ENOMEM;
2436 }
2437
2438 return nfs_fs_proc_net_init(net);
2439 }
2440
nfs_net_exit(struct net * net)2441 static void nfs_net_exit(struct net *net)
2442 {
2443 rpc_proc_unregister(net, "nfs");
2444 nfs_fs_proc_net_exit(net);
2445 nfs_clients_exit(net);
2446 }
2447
2448 static struct pernet_operations nfs_net_ops = {
2449 .init = nfs_net_init,
2450 .exit = nfs_net_exit,
2451 .id = &nfs_net_id,
2452 .size = sizeof(struct nfs_net),
2453 };
2454
2455 /*
2456 * Initialize NFS
2457 */
init_nfs_fs(void)2458 static int __init init_nfs_fs(void)
2459 {
2460 int err;
2461
2462 err = nfs_sysfs_init();
2463 if (err < 0)
2464 goto out10;
2465
2466 err = register_pernet_subsys(&nfs_net_ops);
2467 if (err < 0)
2468 goto out9;
2469
2470 err = nfsiod_start();
2471 if (err)
2472 goto out7;
2473
2474 err = nfs_fs_proc_init();
2475 if (err)
2476 goto out6;
2477
2478 err = nfs_init_nfspagecache();
2479 if (err)
2480 goto out5;
2481
2482 err = nfs_init_inodecache();
2483 if (err)
2484 goto out4;
2485
2486 err = nfs_init_readpagecache();
2487 if (err)
2488 goto out3;
2489
2490 err = nfs_init_writepagecache();
2491 if (err)
2492 goto out2;
2493
2494 err = nfs_init_directcache();
2495 if (err)
2496 goto out1;
2497
2498 err = register_nfs_fs();
2499 if (err)
2500 goto out0;
2501
2502 return 0;
2503 out0:
2504 nfs_destroy_directcache();
2505 out1:
2506 nfs_destroy_writepagecache();
2507 out2:
2508 nfs_destroy_readpagecache();
2509 out3:
2510 nfs_destroy_inodecache();
2511 out4:
2512 nfs_destroy_nfspagecache();
2513 out5:
2514 nfs_fs_proc_exit();
2515 out6:
2516 nfsiod_stop();
2517 out7:
2518 unregister_pernet_subsys(&nfs_net_ops);
2519 out9:
2520 nfs_sysfs_exit();
2521 out10:
2522 return err;
2523 }
2524
exit_nfs_fs(void)2525 static void __exit exit_nfs_fs(void)
2526 {
2527 nfs_destroy_directcache();
2528 nfs_destroy_writepagecache();
2529 nfs_destroy_readpagecache();
2530 nfs_destroy_inodecache();
2531 nfs_destroy_nfspagecache();
2532 unregister_pernet_subsys(&nfs_net_ops);
2533 unregister_nfs_fs();
2534 nfs_fs_proc_exit();
2535 nfsiod_stop();
2536 nfs_sysfs_exit();
2537 }
2538
2539 /* Not quite true; I just maintain it */
2540 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2541 MODULE_LICENSE("GPL");
2542 MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
2543 module_param(enable_ino64, bool, 0644);
2544
2545 module_init(init_nfs_fs)
2546 module_exit(exit_nfs_fs)
2547