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_killable(int mode)75 static int nfs_wait_killable(int mode)
76 {
77 freezable_schedule_unsafe();
78 if (signal_pending_state(mode, current))
79 return -ERESTARTSYS;
80 return 0;
81 }
82
nfs_wait_bit_killable(struct wait_bit_key * key,int mode)83 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
84 {
85 return nfs_wait_killable(mode);
86 }
87 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
88
89 /**
90 * nfs_compat_user_ino64 - returns the user-visible inode number
91 * @fileid: 64-bit fileid
92 *
93 * This function returns a 32-bit inode number if the boot parameter
94 * nfs.enable_ino64 is zero.
95 */
nfs_compat_user_ino64(u64 fileid)96 u64 nfs_compat_user_ino64(u64 fileid)
97 {
98 #ifdef CONFIG_COMPAT
99 compat_ulong_t ino;
100 #else
101 unsigned long ino;
102 #endif
103
104 if (enable_ino64)
105 return fileid;
106 ino = fileid;
107 if (sizeof(ino) < sizeof(fileid))
108 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
109 return ino;
110 }
111
nfs_drop_inode(struct inode * inode)112 int nfs_drop_inode(struct inode *inode)
113 {
114 return NFS_STALE(inode) || generic_drop_inode(inode);
115 }
116 EXPORT_SYMBOL_GPL(nfs_drop_inode);
117
nfs_clear_inode(struct inode * inode)118 void nfs_clear_inode(struct inode *inode)
119 {
120 /*
121 * The following should never happen...
122 */
123 WARN_ON_ONCE(nfs_have_writebacks(inode));
124 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
125 nfs_zap_acl_cache(inode);
126 nfs_access_zap_cache(inode);
127 nfs_fscache_clear_inode(inode);
128 }
129 EXPORT_SYMBOL_GPL(nfs_clear_inode);
130
nfs_evict_inode(struct inode * inode)131 void nfs_evict_inode(struct inode *inode)
132 {
133 truncate_inode_pages_final(&inode->i_data);
134 clear_inode(inode);
135 nfs_clear_inode(inode);
136 }
137
nfs_sync_inode(struct inode * inode)138 int nfs_sync_inode(struct inode *inode)
139 {
140 inode_dio_wait(inode);
141 return nfs_wb_all(inode);
142 }
143 EXPORT_SYMBOL_GPL(nfs_sync_inode);
144
145 /**
146 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
147 * @mapping: pointer to struct address_space
148 */
nfs_sync_mapping(struct address_space * mapping)149 int nfs_sync_mapping(struct address_space *mapping)
150 {
151 int ret = 0;
152
153 if (mapping->nrpages != 0) {
154 unmap_mapping_range(mapping, 0, 0, 0);
155 ret = nfs_wb_all(mapping->host);
156 }
157 return ret;
158 }
159
nfs_attribute_timeout(struct inode * inode)160 static int nfs_attribute_timeout(struct inode *inode)
161 {
162 struct nfs_inode *nfsi = NFS_I(inode);
163
164 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
165 }
166
nfs_check_cache_flags_invalid(struct inode * inode,unsigned long flags)167 static bool nfs_check_cache_flags_invalid(struct inode *inode,
168 unsigned long flags)
169 {
170 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
171
172 return (cache_validity & flags) != 0;
173 }
174
nfs_check_cache_invalid(struct inode * inode,unsigned long flags)175 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
176 {
177 if (nfs_check_cache_flags_invalid(inode, flags))
178 return true;
179 return nfs_attribute_cache_expired(inode);
180 }
181 EXPORT_SYMBOL_GPL(nfs_check_cache_invalid);
182
183 #ifdef CONFIG_NFS_V4_2
nfs_has_xattr_cache(const struct nfs_inode * nfsi)184 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
185 {
186 return nfsi->xattr_cache != NULL;
187 }
188 #else
nfs_has_xattr_cache(const struct nfs_inode * nfsi)189 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
190 {
191 return false;
192 }
193 #endif
194
nfs_set_cache_invalid(struct inode * inode,unsigned long flags)195 void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
196 {
197 struct nfs_inode *nfsi = NFS_I(inode);
198 bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
199
200 if (have_delegation) {
201 if (!(flags & NFS_INO_REVAL_FORCED))
202 flags &= ~(NFS_INO_INVALID_MODE |
203 NFS_INO_INVALID_OTHER |
204 NFS_INO_INVALID_XATTR);
205 flags &= ~(NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
206 } else if (flags & NFS_INO_REVAL_PAGECACHE)
207 flags |= NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE;
208
209 if (!nfs_has_xattr_cache(nfsi))
210 flags &= ~NFS_INO_INVALID_XATTR;
211 if (flags & NFS_INO_INVALID_DATA)
212 nfs_fscache_invalidate(inode);
213 flags &= ~(NFS_INO_REVAL_PAGECACHE | NFS_INO_REVAL_FORCED);
214
215 nfsi->cache_validity |= flags;
216
217 if (inode->i_mapping->nrpages == 0)
218 nfsi->cache_validity &= ~(NFS_INO_INVALID_DATA |
219 NFS_INO_DATA_INVAL_DEFER);
220 else if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
221 nfsi->cache_validity &= ~NFS_INO_DATA_INVAL_DEFER;
222 }
223 EXPORT_SYMBOL_GPL(nfs_set_cache_invalid);
224
225 /*
226 * Invalidate the local caches
227 */
nfs_zap_caches_locked(struct inode * inode)228 static void nfs_zap_caches_locked(struct inode *inode)
229 {
230 struct nfs_inode *nfsi = NFS_I(inode);
231 int mode = inode->i_mode;
232
233 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
234
235 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
236 nfsi->attrtimeo_timestamp = jiffies;
237
238 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
239 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
240 | NFS_INO_INVALID_DATA
241 | NFS_INO_INVALID_ACCESS
242 | NFS_INO_INVALID_ACL
243 | NFS_INO_INVALID_XATTR
244 | NFS_INO_REVAL_PAGECACHE);
245 } else
246 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
247 | NFS_INO_INVALID_ACCESS
248 | NFS_INO_INVALID_ACL
249 | NFS_INO_INVALID_XATTR
250 | NFS_INO_REVAL_PAGECACHE);
251 nfs_zap_label_cache_locked(nfsi);
252 }
253
nfs_zap_caches(struct inode * inode)254 void nfs_zap_caches(struct inode *inode)
255 {
256 spin_lock(&inode->i_lock);
257 nfs_zap_caches_locked(inode);
258 spin_unlock(&inode->i_lock);
259 }
260
nfs_zap_mapping(struct inode * inode,struct address_space * mapping)261 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
262 {
263 if (mapping->nrpages != 0) {
264 spin_lock(&inode->i_lock);
265 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
266 spin_unlock(&inode->i_lock);
267 }
268 }
269
nfs_zap_acl_cache(struct inode * inode)270 void nfs_zap_acl_cache(struct inode *inode)
271 {
272 void (*clear_acl_cache)(struct inode *);
273
274 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
275 if (clear_acl_cache != NULL)
276 clear_acl_cache(inode);
277 spin_lock(&inode->i_lock);
278 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
279 spin_unlock(&inode->i_lock);
280 }
281 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
282
nfs_invalidate_atime(struct inode * inode)283 void nfs_invalidate_atime(struct inode *inode)
284 {
285 spin_lock(&inode->i_lock);
286 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
287 spin_unlock(&inode->i_lock);
288 }
289 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
290
291 /*
292 * Invalidate, but do not unhash, the inode.
293 * NB: must be called with inode->i_lock held!
294 */
nfs_set_inode_stale_locked(struct inode * inode)295 static void nfs_set_inode_stale_locked(struct inode *inode)
296 {
297 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
298 nfs_zap_caches_locked(inode);
299 trace_nfs_set_inode_stale(inode);
300 }
301
nfs_set_inode_stale(struct inode * inode)302 void nfs_set_inode_stale(struct inode *inode)
303 {
304 spin_lock(&inode->i_lock);
305 nfs_set_inode_stale_locked(inode);
306 spin_unlock(&inode->i_lock);
307 }
308
309 struct nfs_find_desc {
310 struct nfs_fh *fh;
311 struct nfs_fattr *fattr;
312 };
313
314 /*
315 * In NFSv3 we can have 64bit inode numbers. In order to support
316 * this, and re-exported directories (also seen in NFSv2)
317 * we are forced to allow 2 different inodes to have the same
318 * i_ino.
319 */
320 static int
nfs_find_actor(struct inode * inode,void * opaque)321 nfs_find_actor(struct inode *inode, void *opaque)
322 {
323 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
324 struct nfs_fh *fh = desc->fh;
325 struct nfs_fattr *fattr = desc->fattr;
326
327 if (NFS_FILEID(inode) != fattr->fileid)
328 return 0;
329 if (inode_wrong_type(inode, fattr->mode))
330 return 0;
331 if (nfs_compare_fh(NFS_FH(inode), fh))
332 return 0;
333 if (is_bad_inode(inode) || NFS_STALE(inode))
334 return 0;
335 return 1;
336 }
337
338 static int
nfs_init_locked(struct inode * inode,void * opaque)339 nfs_init_locked(struct inode *inode, void *opaque)
340 {
341 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
342 struct nfs_fattr *fattr = desc->fattr;
343
344 set_nfs_fileid(inode, fattr->fileid);
345 inode->i_mode = fattr->mode;
346 nfs_copy_fh(NFS_FH(inode), desc->fh);
347 return 0;
348 }
349
350 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
nfs_clear_label_invalid(struct inode * inode)351 static void nfs_clear_label_invalid(struct inode *inode)
352 {
353 spin_lock(&inode->i_lock);
354 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
355 spin_unlock(&inode->i_lock);
356 }
357
nfs_setsecurity(struct inode * inode,struct nfs_fattr * fattr,struct nfs4_label * label)358 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
359 struct nfs4_label *label)
360 {
361 int error;
362
363 if (label == NULL)
364 return;
365
366 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
367 error = security_inode_notifysecctx(inode, label->label,
368 label->len);
369 if (error)
370 printk(KERN_ERR "%s() %s %d "
371 "security_inode_notifysecctx() %d\n",
372 __func__,
373 (char *)label->label,
374 label->len, error);
375 nfs_clear_label_invalid(inode);
376 }
377 }
378
nfs4_label_alloc(struct nfs_server * server,gfp_t flags)379 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
380 {
381 struct nfs4_label *label = NULL;
382 int minor_version = server->nfs_client->cl_minorversion;
383
384 if (minor_version < 2)
385 return label;
386
387 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
388 return label;
389
390 label = kzalloc(sizeof(struct nfs4_label), flags);
391 if (label == NULL)
392 return ERR_PTR(-ENOMEM);
393
394 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
395 if (label->label == NULL) {
396 kfree(label);
397 return ERR_PTR(-ENOMEM);
398 }
399 label->len = NFS4_MAXLABELLEN;
400
401 return label;
402 }
403 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
404 #else
nfs_setsecurity(struct inode * inode,struct nfs_fattr * fattr,struct nfs4_label * label)405 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
406 struct nfs4_label *label)
407 {
408 }
409 #endif
410 EXPORT_SYMBOL_GPL(nfs_setsecurity);
411
412 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
413 struct inode *
nfs_ilookup(struct super_block * sb,struct nfs_fattr * fattr,struct nfs_fh * fh)414 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
415 {
416 struct nfs_find_desc desc = {
417 .fh = fh,
418 .fattr = fattr,
419 };
420 struct inode *inode;
421 unsigned long hash;
422
423 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
424 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
425 return NULL;
426
427 hash = nfs_fattr_to_ino_t(fattr);
428 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
429
430 dprintk("%s: returning %p\n", __func__, inode);
431 return inode;
432 }
433
nfs_inode_init_regular(struct nfs_inode * nfsi)434 static void nfs_inode_init_regular(struct nfs_inode *nfsi)
435 {
436 atomic_long_set(&nfsi->nrequests, 0);
437 atomic_long_set(&nfsi->redirtied_pages, 0);
438 INIT_LIST_HEAD(&nfsi->commit_info.list);
439 atomic_long_set(&nfsi->commit_info.ncommit, 0);
440 atomic_set(&nfsi->commit_info.rpcs_out, 0);
441 mutex_init(&nfsi->commit_mutex);
442 }
443
nfs_inode_init_dir(struct nfs_inode * nfsi)444 static void nfs_inode_init_dir(struct nfs_inode *nfsi)
445 {
446 nfsi->cache_change_attribute = 0;
447 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
448 init_rwsem(&nfsi->rmdir_sem);
449 }
450
451 /*
452 * This is our front-end to iget that looks up inodes by file handle
453 * instead of inode number.
454 */
455 struct inode *
nfs_fhget(struct super_block * sb,struct nfs_fh * fh,struct nfs_fattr * fattr,struct nfs4_label * label)456 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
457 {
458 struct nfs_find_desc desc = {
459 .fh = fh,
460 .fattr = fattr
461 };
462 struct inode *inode = ERR_PTR(-ENOENT);
463 u64 fattr_supported = NFS_SB(sb)->fattr_valid;
464 unsigned long hash;
465
466 nfs_attr_check_mountpoint(sb, fattr);
467
468 if (nfs_attr_use_mounted_on_fileid(fattr))
469 fattr->fileid = fattr->mounted_on_fileid;
470 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
471 goto out_no_inode;
472 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
473 goto out_no_inode;
474
475 hash = nfs_fattr_to_ino_t(fattr);
476
477 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
478 if (inode == NULL) {
479 inode = ERR_PTR(-ENOMEM);
480 goto out_no_inode;
481 }
482
483 if (inode->i_state & I_NEW) {
484 struct nfs_inode *nfsi = NFS_I(inode);
485 unsigned long now = jiffies;
486
487 /* We set i_ino for the few things that still rely on it,
488 * such as stat(2) */
489 inode->i_ino = hash;
490
491 /* We can't support update_atime(), since the server will reset it */
492 inode->i_flags |= S_NOATIME|S_NOCMTIME;
493 inode->i_mode = fattr->mode;
494 nfsi->cache_validity = 0;
495 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
496 && (fattr_supported & NFS_ATTR_FATTR_MODE))
497 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE);
498 /* Why so? Because we want revalidate for devices/FIFOs, and
499 * that's precisely what we have in nfs_file_inode_operations.
500 */
501 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
502 if (S_ISREG(inode->i_mode)) {
503 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
504 inode->i_data.a_ops = &nfs_file_aops;
505 nfs_inode_init_regular(nfsi);
506 } else if (S_ISDIR(inode->i_mode)) {
507 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
508 inode->i_fop = &nfs_dir_operations;
509 inode->i_data.a_ops = &nfs_dir_aops;
510 nfs_inode_init_dir(nfsi);
511 /* Deal with crossing mountpoints */
512 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
513 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
514 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
515 inode->i_op = &nfs_referral_inode_operations;
516 else
517 inode->i_op = &nfs_mountpoint_inode_operations;
518 inode->i_fop = NULL;
519 inode->i_flags |= S_AUTOMOUNT;
520 }
521 } else if (S_ISLNK(inode->i_mode)) {
522 inode->i_op = &nfs_symlink_inode_operations;
523 inode_nohighmem(inode);
524 } else
525 init_special_inode(inode, inode->i_mode, fattr->rdev);
526
527 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
528 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
529 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
530 inode_set_iversion_raw(inode, 0);
531 inode->i_size = 0;
532 clear_nlink(inode);
533 inode->i_uid = make_kuid(&init_user_ns, -2);
534 inode->i_gid = make_kgid(&init_user_ns, -2);
535 inode->i_blocks = 0;
536 nfsi->write_io = 0;
537 nfsi->read_io = 0;
538
539 nfsi->read_cache_jiffies = fattr->time_start;
540 nfsi->attr_gencount = fattr->gencount;
541 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
542 inode->i_atime = fattr->atime;
543 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
544 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
545 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
546 inode->i_mtime = fattr->mtime;
547 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
548 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
549 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
550 inode->i_ctime = fattr->ctime;
551 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
552 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
553 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
554 inode_set_iversion_raw(inode, fattr->change_attr);
555 else
556 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
557 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
558 inode->i_size = nfs_size_to_loff_t(fattr->size);
559 else
560 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
561 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
562 set_nlink(inode, fattr->nlink);
563 else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
564 nfs_set_cache_invalid(inode, NFS_INO_INVALID_NLINK);
565 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
566 inode->i_uid = fattr->uid;
567 else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
568 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
569 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
570 inode->i_gid = fattr->gid;
571 else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
572 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
573 if (nfs_server_capable(inode, NFS_CAP_XATTR))
574 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
575 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
576 inode->i_blocks = fattr->du.nfs2.blocks;
577 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED &&
578 fattr->size != 0)
579 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
580 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
581 /*
582 * report the blocks in 512byte units
583 */
584 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
585 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED &&
586 fattr->size != 0)
587 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
588
589 nfs_setsecurity(inode, fattr, label);
590
591 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
592 nfsi->attrtimeo_timestamp = now;
593 nfsi->access_cache = RB_ROOT;
594
595 nfs_fscache_init_inode(inode);
596
597 unlock_new_inode(inode);
598 } else {
599 int err = nfs_refresh_inode(inode, fattr);
600 if (err < 0) {
601 iput(inode);
602 inode = ERR_PTR(err);
603 goto out_no_inode;
604 }
605 }
606 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
607 inode->i_sb->s_id,
608 (unsigned long long)NFS_FILEID(inode),
609 nfs_display_fhandle_hash(fh),
610 atomic_read(&inode->i_count));
611
612 out:
613 return inode;
614
615 out_no_inode:
616 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
617 goto out;
618 }
619 EXPORT_SYMBOL_GPL(nfs_fhget);
620
621 #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)
622
623 int
nfs_setattr(struct user_namespace * mnt_userns,struct dentry * dentry,struct iattr * attr)624 nfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
625 struct iattr *attr)
626 {
627 struct inode *inode = d_inode(dentry);
628 struct nfs_fattr *fattr;
629 int error = 0;
630
631 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
632
633 /* skip mode change if it's just for clearing setuid/setgid */
634 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
635 attr->ia_valid &= ~ATTR_MODE;
636
637 if (attr->ia_valid & ATTR_SIZE) {
638 BUG_ON(!S_ISREG(inode->i_mode));
639
640 error = inode_newsize_ok(inode, attr->ia_size);
641 if (error)
642 return error;
643
644 if (attr->ia_size == i_size_read(inode))
645 attr->ia_valid &= ~ATTR_SIZE;
646 }
647
648 /* Optimization: if the end result is no change, don't RPC */
649 if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0)
650 return 0;
651
652 trace_nfs_setattr_enter(inode);
653
654 /* Write all dirty data */
655 if (S_ISREG(inode->i_mode))
656 nfs_sync_inode(inode);
657
658 fattr = nfs_alloc_fattr();
659 if (fattr == NULL) {
660 error = -ENOMEM;
661 goto out;
662 }
663
664 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
665 if (error == 0)
666 error = nfs_refresh_inode(inode, fattr);
667 nfs_free_fattr(fattr);
668 out:
669 trace_nfs_setattr_exit(inode, error);
670 return error;
671 }
672 EXPORT_SYMBOL_GPL(nfs_setattr);
673
674 /**
675 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
676 * @inode: inode of the file used
677 * @offset: file offset to start truncating
678 *
679 * This is a copy of the common vmtruncate, but with the locking
680 * corrected to take into account the fact that NFS requires
681 * inode->i_size to be updated under the inode->i_lock.
682 * Note: must be called with inode->i_lock held!
683 */
nfs_vmtruncate(struct inode * inode,loff_t offset)684 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
685 {
686 int err;
687
688 err = inode_newsize_ok(inode, offset);
689 if (err)
690 goto out;
691
692 i_size_write(inode, offset);
693 /* Optimisation */
694 if (offset == 0)
695 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA |
696 NFS_INO_DATA_INVAL_DEFER);
697 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
698
699 spin_unlock(&inode->i_lock);
700 truncate_pagecache(inode, offset);
701 spin_lock(&inode->i_lock);
702 out:
703 return err;
704 }
705
706 /**
707 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
708 * @inode: pointer to struct inode
709 * @attr: pointer to struct iattr
710 * @fattr: pointer to struct nfs_fattr
711 *
712 * Note: we do this in the *proc.c in order to ensure that
713 * it works for things like exclusive creates too.
714 */
nfs_setattr_update_inode(struct inode * inode,struct iattr * attr,struct nfs_fattr * fattr)715 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
716 struct nfs_fattr *fattr)
717 {
718 /* Barrier: bump the attribute generation count. */
719 nfs_fattr_set_barrier(fattr);
720
721 spin_lock(&inode->i_lock);
722 NFS_I(inode)->attr_gencount = fattr->gencount;
723 if ((attr->ia_valid & ATTR_SIZE) != 0) {
724 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME |
725 NFS_INO_INVALID_BLOCKS);
726 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
727 nfs_vmtruncate(inode, attr->ia_size);
728 }
729 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
730 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
731 if ((attr->ia_valid & ATTR_KILL_SUID) != 0 &&
732 inode->i_mode & S_ISUID)
733 inode->i_mode &= ~S_ISUID;
734 if (setattr_should_drop_sgid(&init_user_ns, inode))
735 inode->i_mode &= ~S_ISGID;
736 if ((attr->ia_valid & ATTR_MODE) != 0) {
737 int mode = attr->ia_mode & S_IALLUGO;
738 mode |= inode->i_mode & ~S_IALLUGO;
739 inode->i_mode = mode;
740 }
741 if ((attr->ia_valid & ATTR_UID) != 0)
742 inode->i_uid = attr->ia_uid;
743 if ((attr->ia_valid & ATTR_GID) != 0)
744 inode->i_gid = attr->ia_gid;
745 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
746 inode->i_ctime = fattr->ctime;
747 else
748 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
749 | NFS_INO_INVALID_CTIME);
750 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
751 | NFS_INO_INVALID_ACL);
752 }
753 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
754 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
755 | NFS_INO_INVALID_CTIME);
756 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
757 inode->i_atime = fattr->atime;
758 else if (attr->ia_valid & ATTR_ATIME_SET)
759 inode->i_atime = attr->ia_atime;
760 else
761 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
762
763 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
764 inode->i_ctime = fattr->ctime;
765 else
766 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
767 | NFS_INO_INVALID_CTIME);
768 }
769 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
770 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
771 | NFS_INO_INVALID_CTIME);
772 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
773 inode->i_mtime = fattr->mtime;
774 else if (attr->ia_valid & ATTR_MTIME_SET)
775 inode->i_mtime = attr->ia_mtime;
776 else
777 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
778
779 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
780 inode->i_ctime = fattr->ctime;
781 else
782 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
783 | NFS_INO_INVALID_CTIME);
784 }
785 if (fattr->valid)
786 nfs_update_inode(inode, fattr);
787 spin_unlock(&inode->i_lock);
788 }
789 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
790
nfs_readdirplus_parent_cache_miss(struct dentry * dentry)791 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
792 {
793 struct dentry *parent;
794
795 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
796 return;
797 parent = dget_parent(dentry);
798 nfs_force_use_readdirplus(d_inode(parent));
799 dput(parent);
800 }
801
nfs_readdirplus_parent_cache_hit(struct dentry * dentry)802 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
803 {
804 struct dentry *parent;
805
806 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
807 return;
808 parent = dget_parent(dentry);
809 nfs_advise_use_readdirplus(d_inode(parent));
810 dput(parent);
811 }
812
nfs_get_valid_attrmask(struct inode * inode)813 static u32 nfs_get_valid_attrmask(struct inode *inode)
814 {
815 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
816 u32 reply_mask = STATX_INO | STATX_TYPE;
817
818 if (!(cache_validity & NFS_INO_INVALID_ATIME))
819 reply_mask |= STATX_ATIME;
820 if (!(cache_validity & NFS_INO_INVALID_CTIME))
821 reply_mask |= STATX_CTIME;
822 if (!(cache_validity & NFS_INO_INVALID_MTIME))
823 reply_mask |= STATX_MTIME;
824 if (!(cache_validity & NFS_INO_INVALID_SIZE))
825 reply_mask |= STATX_SIZE;
826 if (!(cache_validity & NFS_INO_INVALID_NLINK))
827 reply_mask |= STATX_NLINK;
828 if (!(cache_validity & NFS_INO_INVALID_MODE))
829 reply_mask |= STATX_MODE;
830 if (!(cache_validity & NFS_INO_INVALID_OTHER))
831 reply_mask |= STATX_UID | STATX_GID;
832 if (!(cache_validity & NFS_INO_INVALID_BLOCKS))
833 reply_mask |= STATX_BLOCKS;
834 return reply_mask;
835 }
836
nfs_getattr(struct user_namespace * mnt_userns,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)837 int nfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
838 struct kstat *stat, u32 request_mask, unsigned int query_flags)
839 {
840 struct inode *inode = d_inode(path->dentry);
841 struct nfs_server *server = NFS_SERVER(inode);
842 unsigned long cache_validity;
843 int err = 0;
844 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
845 bool do_update = false;
846
847 trace_nfs_getattr_enter(inode);
848
849 request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID |
850 STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME |
851 STATX_INO | STATX_SIZE | STATX_BLOCKS;
852
853 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
854 nfs_readdirplus_parent_cache_hit(path->dentry);
855 goto out_no_revalidate;
856 }
857
858 /* Flush out writes to the server in order to update c/mtime. */
859 if ((request_mask & (STATX_CTIME | STATX_MTIME)) &&
860 S_ISREG(inode->i_mode))
861 filemap_write_and_wait(inode->i_mapping);
862
863 /*
864 * We may force a getattr if the user cares about atime.
865 *
866 * Note that we only have to check the vfsmount flags here:
867 * - NFS always sets S_NOATIME by so checking it would give a
868 * bogus result
869 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
870 * no point in checking those.
871 */
872 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
873 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
874 request_mask &= ~STATX_ATIME;
875
876 /* Is the user requesting attributes that might need revalidation? */
877 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
878 STATX_MTIME|STATX_UID|STATX_GID|
879 STATX_SIZE|STATX_BLOCKS)))
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 /* Update the attribute cache */
905 if (!(server->flags & NFS_MOUNT_NOAC))
906 nfs_readdirplus_parent_cache_miss(path->dentry);
907 else
908 nfs_readdirplus_parent_cache_hit(path->dentry);
909 err = __nfs_revalidate_inode(server, inode);
910 if (err)
911 goto out;
912 } else
913 nfs_readdirplus_parent_cache_hit(path->dentry);
914 out_no_revalidate:
915 /* Only return attributes that were revalidated. */
916 stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask;
917
918 generic_fillattr(&init_user_ns, inode, stat);
919 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
920 if (S_ISDIR(inode->i_mode))
921 stat->blksize = NFS_SERVER(inode)->dtsize;
922 out:
923 trace_nfs_getattr_exit(inode, err);
924 return err;
925 }
926 EXPORT_SYMBOL_GPL(nfs_getattr);
927
nfs_init_lock_context(struct nfs_lock_context * l_ctx)928 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
929 {
930 refcount_set(&l_ctx->count, 1);
931 l_ctx->lockowner = current->files;
932 INIT_LIST_HEAD(&l_ctx->list);
933 atomic_set(&l_ctx->io_count, 0);
934 }
935
__nfs_find_lock_context(struct nfs_open_context * ctx)936 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
937 {
938 struct nfs_lock_context *pos;
939
940 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
941 if (pos->lockowner != current->files)
942 continue;
943 if (refcount_inc_not_zero(&pos->count))
944 return pos;
945 }
946 return NULL;
947 }
948
nfs_get_lock_context(struct nfs_open_context * ctx)949 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
950 {
951 struct nfs_lock_context *res, *new = NULL;
952 struct inode *inode = d_inode(ctx->dentry);
953
954 rcu_read_lock();
955 res = __nfs_find_lock_context(ctx);
956 rcu_read_unlock();
957 if (res == NULL) {
958 new = kmalloc(sizeof(*new), GFP_KERNEL);
959 if (new == NULL)
960 return ERR_PTR(-ENOMEM);
961 nfs_init_lock_context(new);
962 spin_lock(&inode->i_lock);
963 res = __nfs_find_lock_context(ctx);
964 if (res == NULL) {
965 new->open_context = get_nfs_open_context(ctx);
966 if (new->open_context) {
967 list_add_tail_rcu(&new->list,
968 &ctx->lock_context.list);
969 res = new;
970 new = NULL;
971 } else
972 res = ERR_PTR(-EBADF);
973 }
974 spin_unlock(&inode->i_lock);
975 kfree(new);
976 }
977 return res;
978 }
979 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
980
nfs_put_lock_context(struct nfs_lock_context * l_ctx)981 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
982 {
983 struct nfs_open_context *ctx = l_ctx->open_context;
984 struct inode *inode = d_inode(ctx->dentry);
985
986 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
987 return;
988 list_del_rcu(&l_ctx->list);
989 spin_unlock(&inode->i_lock);
990 put_nfs_open_context(ctx);
991 kfree_rcu(l_ctx, rcu_head);
992 }
993 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
994
995 /**
996 * nfs_close_context - Common close_context() routine NFSv2/v3
997 * @ctx: pointer to context
998 * @is_sync: is this a synchronous close
999 *
1000 * Ensure that the attributes are up to date if we're mounted
1001 * with close-to-open semantics and we have cached data that will
1002 * need to be revalidated on open.
1003 */
nfs_close_context(struct nfs_open_context * ctx,int is_sync)1004 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
1005 {
1006 struct nfs_inode *nfsi;
1007 struct inode *inode;
1008
1009 if (!(ctx->mode & FMODE_WRITE))
1010 return;
1011 if (!is_sync)
1012 return;
1013 inode = d_inode(ctx->dentry);
1014 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1015 return;
1016 nfsi = NFS_I(inode);
1017 if (inode->i_mapping->nrpages == 0)
1018 return;
1019 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1020 return;
1021 if (!list_empty(&nfsi->open_files))
1022 return;
1023 if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO)
1024 return;
1025 nfs_revalidate_inode(inode,
1026 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
1027 }
1028 EXPORT_SYMBOL_GPL(nfs_close_context);
1029
alloc_nfs_open_context(struct dentry * dentry,fmode_t f_mode,struct file * filp)1030 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
1031 fmode_t f_mode,
1032 struct file *filp)
1033 {
1034 struct nfs_open_context *ctx;
1035
1036 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
1037 if (!ctx)
1038 return ERR_PTR(-ENOMEM);
1039 nfs_sb_active(dentry->d_sb);
1040 ctx->dentry = dget(dentry);
1041 if (filp)
1042 ctx->cred = get_cred(filp->f_cred);
1043 else
1044 ctx->cred = get_current_cred();
1045 ctx->ll_cred = NULL;
1046 ctx->state = NULL;
1047 ctx->mode = f_mode;
1048 ctx->flags = 0;
1049 ctx->error = 0;
1050 ctx->flock_owner = (fl_owner_t)filp;
1051 nfs_init_lock_context(&ctx->lock_context);
1052 ctx->lock_context.open_context = ctx;
1053 INIT_LIST_HEAD(&ctx->list);
1054 ctx->mdsthreshold = NULL;
1055 return ctx;
1056 }
1057 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1058
get_nfs_open_context(struct nfs_open_context * ctx)1059 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1060 {
1061 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1062 return ctx;
1063 return NULL;
1064 }
1065 EXPORT_SYMBOL_GPL(get_nfs_open_context);
1066
__put_nfs_open_context(struct nfs_open_context * ctx,int is_sync)1067 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1068 {
1069 struct inode *inode = d_inode(ctx->dentry);
1070 struct super_block *sb = ctx->dentry->d_sb;
1071
1072 if (!refcount_dec_and_test(&ctx->lock_context.count))
1073 return;
1074 if (!list_empty(&ctx->list)) {
1075 spin_lock(&inode->i_lock);
1076 list_del_rcu(&ctx->list);
1077 spin_unlock(&inode->i_lock);
1078 }
1079 if (inode != NULL)
1080 NFS_PROTO(inode)->close_context(ctx, is_sync);
1081 put_cred(ctx->cred);
1082 dput(ctx->dentry);
1083 nfs_sb_deactive(sb);
1084 put_rpccred(ctx->ll_cred);
1085 kfree(ctx->mdsthreshold);
1086 kfree_rcu(ctx, rcu_head);
1087 }
1088
put_nfs_open_context(struct nfs_open_context * ctx)1089 void put_nfs_open_context(struct nfs_open_context *ctx)
1090 {
1091 __put_nfs_open_context(ctx, 0);
1092 }
1093 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1094
put_nfs_open_context_sync(struct nfs_open_context * ctx)1095 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1096 {
1097 __put_nfs_open_context(ctx, 1);
1098 }
1099
1100 /*
1101 * Ensure that mmap has a recent RPC credential for use when writing out
1102 * shared pages
1103 */
nfs_inode_attach_open_context(struct nfs_open_context * ctx)1104 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1105 {
1106 struct inode *inode = d_inode(ctx->dentry);
1107 struct nfs_inode *nfsi = NFS_I(inode);
1108
1109 spin_lock(&inode->i_lock);
1110 if (list_empty(&nfsi->open_files) &&
1111 (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER))
1112 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA |
1113 NFS_INO_REVAL_FORCED);
1114 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1115 spin_unlock(&inode->i_lock);
1116 }
1117 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1118
nfs_file_set_open_context(struct file * filp,struct nfs_open_context * ctx)1119 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1120 {
1121 filp->private_data = get_nfs_open_context(ctx);
1122 set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1123 if (list_empty(&ctx->list))
1124 nfs_inode_attach_open_context(ctx);
1125 }
1126 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1127
1128 /*
1129 * Given an inode, search for an open context with the desired characteristics
1130 */
nfs_find_open_context(struct inode * inode,const struct cred * cred,fmode_t mode)1131 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1132 {
1133 struct nfs_inode *nfsi = NFS_I(inode);
1134 struct nfs_open_context *pos, *ctx = NULL;
1135
1136 rcu_read_lock();
1137 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1138 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1139 continue;
1140 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1141 continue;
1142 if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags))
1143 continue;
1144 ctx = get_nfs_open_context(pos);
1145 if (ctx)
1146 break;
1147 }
1148 rcu_read_unlock();
1149 return ctx;
1150 }
1151
nfs_file_clear_open_context(struct file * filp)1152 void nfs_file_clear_open_context(struct file *filp)
1153 {
1154 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1155
1156 if (ctx) {
1157 struct inode *inode = d_inode(ctx->dentry);
1158
1159 clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1160 /*
1161 * We fatal error on write before. Try to writeback
1162 * every page again.
1163 */
1164 if (ctx->error < 0)
1165 invalidate_inode_pages2(inode->i_mapping);
1166 filp->private_data = NULL;
1167 put_nfs_open_context_sync(ctx);
1168 }
1169 }
1170
1171 /*
1172 * These allocate and release file read/write context information.
1173 */
nfs_open(struct inode * inode,struct file * filp)1174 int nfs_open(struct inode *inode, struct file *filp)
1175 {
1176 struct nfs_open_context *ctx;
1177
1178 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
1179 if (IS_ERR(ctx))
1180 return PTR_ERR(ctx);
1181 nfs_file_set_open_context(filp, ctx);
1182 put_nfs_open_context(ctx);
1183 nfs_fscache_open_file(inode, filp);
1184 return 0;
1185 }
1186
1187 /*
1188 * This function is called whenever some part of NFS notices that
1189 * the cached attributes have to be refreshed.
1190 */
1191 int
__nfs_revalidate_inode(struct nfs_server * server,struct inode * inode)1192 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1193 {
1194 int status = -ESTALE;
1195 struct nfs4_label *label = NULL;
1196 struct nfs_fattr *fattr = NULL;
1197 struct nfs_inode *nfsi = NFS_I(inode);
1198
1199 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1200 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1201
1202 trace_nfs_revalidate_inode_enter(inode);
1203
1204 if (is_bad_inode(inode))
1205 goto out;
1206 if (NFS_STALE(inode))
1207 goto out;
1208
1209 /* pNFS: Attributes aren't updated until we layoutcommit */
1210 if (S_ISREG(inode->i_mode)) {
1211 status = pnfs_sync_inode(inode, false);
1212 if (status)
1213 goto out;
1214 }
1215
1216 status = -ENOMEM;
1217 fattr = nfs_alloc_fattr();
1218 if (fattr == NULL)
1219 goto out;
1220
1221 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1222
1223 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1224 if (IS_ERR(label)) {
1225 status = PTR_ERR(label);
1226 goto out;
1227 }
1228
1229 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1230 label, inode);
1231 if (status != 0) {
1232 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1233 inode->i_sb->s_id,
1234 (unsigned long long)NFS_FILEID(inode), status);
1235 switch (status) {
1236 case -ETIMEDOUT:
1237 /* A soft timeout occurred. Use cached information? */
1238 if (server->flags & NFS_MOUNT_SOFTREVAL)
1239 status = 0;
1240 break;
1241 case -ESTALE:
1242 if (!S_ISDIR(inode->i_mode))
1243 nfs_set_inode_stale(inode);
1244 else
1245 nfs_zap_caches(inode);
1246 }
1247 goto err_out;
1248 }
1249
1250 status = nfs_refresh_inode(inode, fattr);
1251 if (status) {
1252 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1253 inode->i_sb->s_id,
1254 (unsigned long long)NFS_FILEID(inode), status);
1255 goto err_out;
1256 }
1257
1258 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1259 nfs_zap_acl_cache(inode);
1260
1261 nfs_setsecurity(inode, fattr, label);
1262
1263 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1264 inode->i_sb->s_id,
1265 (unsigned long long)NFS_FILEID(inode));
1266
1267 err_out:
1268 nfs4_label_free(label);
1269 out:
1270 nfs_free_fattr(fattr);
1271 trace_nfs_revalidate_inode_exit(inode, status);
1272 return status;
1273 }
1274
nfs_attribute_cache_expired(struct inode * inode)1275 int nfs_attribute_cache_expired(struct inode *inode)
1276 {
1277 if (nfs_have_delegated_attributes(inode))
1278 return 0;
1279 return nfs_attribute_timeout(inode);
1280 }
1281
1282 /**
1283 * nfs_revalidate_inode - Revalidate the inode attributes
1284 * @inode: pointer to inode struct
1285 * @flags: cache flags to check
1286 *
1287 * Updates inode attribute information by retrieving the data from the server.
1288 */
nfs_revalidate_inode(struct inode * inode,unsigned long flags)1289 int nfs_revalidate_inode(struct inode *inode, unsigned long flags)
1290 {
1291 if (!nfs_check_cache_invalid(inode, flags))
1292 return NFS_STALE(inode) ? -ESTALE : 0;
1293 return __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1294 }
1295 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1296
nfs_invalidate_mapping(struct inode * inode,struct address_space * mapping)1297 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1298 {
1299 int ret;
1300
1301 if (mapping->nrpages != 0) {
1302 if (S_ISREG(inode->i_mode)) {
1303 ret = nfs_sync_mapping(mapping);
1304 if (ret < 0)
1305 return ret;
1306 }
1307 ret = invalidate_inode_pages2(mapping);
1308 if (ret < 0)
1309 return ret;
1310 }
1311 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1312 nfs_fscache_wait_on_invalidate(inode);
1313
1314 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1315 inode->i_sb->s_id,
1316 (unsigned long long)NFS_FILEID(inode));
1317 return 0;
1318 }
1319
1320 /**
1321 * nfs_clear_invalid_mapping - Conditionally clear a mapping
1322 * @mapping: pointer to mapping
1323 *
1324 * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping.
1325 */
nfs_clear_invalid_mapping(struct address_space * mapping)1326 int nfs_clear_invalid_mapping(struct address_space *mapping)
1327 {
1328 struct inode *inode = mapping->host;
1329 struct nfs_inode *nfsi = NFS_I(inode);
1330 unsigned long *bitlock = &nfsi->flags;
1331 int ret = 0;
1332
1333 /*
1334 * We must clear NFS_INO_INVALID_DATA first to ensure that
1335 * invalidations that come in while we're shooting down the mappings
1336 * are respected. But, that leaves a race window where one revalidator
1337 * can clear the flag, and then another checks it before the mapping
1338 * gets invalidated. Fix that by serializing access to this part of
1339 * the function.
1340 *
1341 * At the same time, we need to allow other tasks to see whether we
1342 * might be in the middle of invalidating the pages, so we only set
1343 * the bit lock here if it looks like we're going to be doing that.
1344 */
1345 for (;;) {
1346 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1347 nfs_wait_bit_killable, TASK_KILLABLE);
1348 if (ret)
1349 goto out;
1350 spin_lock(&inode->i_lock);
1351 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1352 spin_unlock(&inode->i_lock);
1353 continue;
1354 }
1355 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1356 break;
1357 spin_unlock(&inode->i_lock);
1358 goto out;
1359 }
1360
1361 set_bit(NFS_INO_INVALIDATING, bitlock);
1362 smp_wmb();
1363 nfsi->cache_validity &=
1364 ~(NFS_INO_INVALID_DATA | NFS_INO_DATA_INVAL_DEFER);
1365 spin_unlock(&inode->i_lock);
1366 trace_nfs_invalidate_mapping_enter(inode);
1367 ret = nfs_invalidate_mapping(inode, mapping);
1368 trace_nfs_invalidate_mapping_exit(inode, ret);
1369
1370 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1371 smp_mb__after_atomic();
1372 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1373 out:
1374 return ret;
1375 }
1376
nfs_mapping_need_revalidate_inode(struct inode * inode)1377 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1378 {
1379 return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) ||
1380 NFS_STALE(inode);
1381 }
1382
nfs_revalidate_mapping_rcu(struct inode * inode)1383 int nfs_revalidate_mapping_rcu(struct inode *inode)
1384 {
1385 struct nfs_inode *nfsi = NFS_I(inode);
1386 unsigned long *bitlock = &nfsi->flags;
1387 int ret = 0;
1388
1389 if (IS_SWAPFILE(inode))
1390 goto out;
1391 if (nfs_mapping_need_revalidate_inode(inode)) {
1392 ret = -ECHILD;
1393 goto out;
1394 }
1395 spin_lock(&inode->i_lock);
1396 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1397 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1398 ret = -ECHILD;
1399 spin_unlock(&inode->i_lock);
1400 out:
1401 return ret;
1402 }
1403
1404 /**
1405 * nfs_revalidate_mapping - Revalidate the pagecache
1406 * @inode: pointer to host inode
1407 * @mapping: pointer to mapping
1408 */
nfs_revalidate_mapping(struct inode * inode,struct address_space * mapping)1409 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1410 {
1411 /* swapfiles are not supposed to be shared. */
1412 if (IS_SWAPFILE(inode))
1413 return 0;
1414
1415 if (nfs_mapping_need_revalidate_inode(inode)) {
1416 int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1417 if (ret < 0)
1418 return ret;
1419 }
1420
1421 return nfs_clear_invalid_mapping(mapping);
1422 }
1423
nfs_file_has_writers(struct nfs_inode * nfsi)1424 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1425 {
1426 struct inode *inode = &nfsi->vfs_inode;
1427
1428 if (!S_ISREG(inode->i_mode))
1429 return false;
1430 if (list_empty(&nfsi->open_files))
1431 return false;
1432 return inode_is_open_for_write(inode);
1433 }
1434
nfs_file_has_buffered_writers(struct nfs_inode * nfsi)1435 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1436 {
1437 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1438 }
1439
nfs_wcc_update_inode(struct inode * inode,struct nfs_fattr * fattr)1440 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1441 {
1442 struct timespec64 ts;
1443
1444 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1445 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1446 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1447 inode_set_iversion_raw(inode, fattr->change_attr);
1448 if (S_ISDIR(inode->i_mode))
1449 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1450 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1451 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
1452 }
1453 /* If we have atomic WCC data, we may update some attributes */
1454 ts = inode->i_ctime;
1455 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1456 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1457 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1458 inode->i_ctime = fattr->ctime;
1459 }
1460
1461 ts = inode->i_mtime;
1462 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1463 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1464 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1465 inode->i_mtime = fattr->mtime;
1466 if (S_ISDIR(inode->i_mode))
1467 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1468 }
1469 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1470 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1471 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1472 && !nfs_have_writebacks(inode)) {
1473 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1474 }
1475 }
1476
1477 /**
1478 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1479 * @inode: pointer to inode
1480 * @fattr: updated attributes
1481 *
1482 * Verifies the attribute cache. If we have just changed the attributes,
1483 * so that fattr carries weak cache consistency data, then it may
1484 * also update the ctime/mtime/change_attribute.
1485 */
nfs_check_inode_attributes(struct inode * inode,struct nfs_fattr * fattr)1486 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1487 {
1488 struct nfs_inode *nfsi = NFS_I(inode);
1489 loff_t cur_size, new_isize;
1490 unsigned long invalid = 0;
1491 struct timespec64 ts;
1492
1493 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1494 return 0;
1495
1496 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1497 /* Only a mounted-on-fileid? Just exit */
1498 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1499 return 0;
1500 /* Has the inode gone and changed behind our back? */
1501 } else if (nfsi->fileid != fattr->fileid) {
1502 /* Is this perhaps the mounted-on fileid? */
1503 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1504 nfsi->fileid == fattr->mounted_on_fileid)
1505 return 0;
1506 return -ESTALE;
1507 }
1508 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode))
1509 return -ESTALE;
1510
1511
1512 if (!nfs_file_has_buffered_writers(nfsi)) {
1513 /* Verify a few of the more important attributes */
1514 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1515 invalid |= NFS_INO_INVALID_CHANGE;
1516
1517 ts = inode->i_mtime;
1518 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
1519 invalid |= NFS_INO_INVALID_MTIME;
1520
1521 ts = inode->i_ctime;
1522 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
1523 invalid |= NFS_INO_INVALID_CTIME;
1524
1525 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1526 cur_size = i_size_read(inode);
1527 new_isize = nfs_size_to_loff_t(fattr->size);
1528 if (cur_size != new_isize)
1529 invalid |= NFS_INO_INVALID_SIZE;
1530 }
1531 }
1532
1533 /* Have any file permissions changed? */
1534 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1535 invalid |= NFS_INO_INVALID_MODE;
1536 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1537 invalid |= NFS_INO_INVALID_OTHER;
1538 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1539 invalid |= NFS_INO_INVALID_OTHER;
1540
1541 /* Has the link count changed? */
1542 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1543 invalid |= NFS_INO_INVALID_NLINK;
1544
1545 ts = inode->i_atime;
1546 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
1547 invalid |= NFS_INO_INVALID_ATIME;
1548
1549 if (invalid != 0)
1550 nfs_set_cache_invalid(inode, invalid);
1551
1552 nfsi->read_cache_jiffies = fattr->time_start;
1553 return 0;
1554 }
1555
1556 static atomic_long_t nfs_attr_generation_counter;
1557
nfs_read_attr_generation_counter(void)1558 static unsigned long nfs_read_attr_generation_counter(void)
1559 {
1560 return atomic_long_read(&nfs_attr_generation_counter);
1561 }
1562
nfs_inc_attr_generation_counter(void)1563 unsigned long nfs_inc_attr_generation_counter(void)
1564 {
1565 return atomic_long_inc_return(&nfs_attr_generation_counter);
1566 }
1567 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1568
nfs_fattr_init(struct nfs_fattr * fattr)1569 void nfs_fattr_init(struct nfs_fattr *fattr)
1570 {
1571 fattr->valid = 0;
1572 fattr->time_start = jiffies;
1573 fattr->gencount = nfs_inc_attr_generation_counter();
1574 fattr->owner_name = NULL;
1575 fattr->group_name = NULL;
1576 }
1577 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1578
1579 /**
1580 * nfs_fattr_set_barrier
1581 * @fattr: attributes
1582 *
1583 * Used to set a barrier after an attribute was updated. This
1584 * barrier ensures that older attributes from RPC calls that may
1585 * have raced with our update cannot clobber these new values.
1586 * Note that you are still responsible for ensuring that other
1587 * operations which change the attribute on the server do not
1588 * collide.
1589 */
nfs_fattr_set_barrier(struct nfs_fattr * fattr)1590 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1591 {
1592 fattr->gencount = nfs_inc_attr_generation_counter();
1593 }
1594
nfs_alloc_fattr(void)1595 struct nfs_fattr *nfs_alloc_fattr(void)
1596 {
1597 struct nfs_fattr *fattr;
1598
1599 fattr = kmalloc(sizeof(*fattr), GFP_KERNEL);
1600 if (fattr != NULL) {
1601 nfs_fattr_init(fattr);
1602 fattr->label = NULL;
1603 }
1604 return fattr;
1605 }
1606 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1607
nfs_alloc_fattr_with_label(struct nfs_server * server)1608 struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server)
1609 {
1610 struct nfs_fattr *fattr = nfs_alloc_fattr();
1611
1612 if (!fattr)
1613 return NULL;
1614
1615 fattr->label = nfs4_label_alloc(server, GFP_KERNEL);
1616 if (IS_ERR(fattr->label)) {
1617 kfree(fattr);
1618 return NULL;
1619 }
1620
1621 return fattr;
1622 }
1623 EXPORT_SYMBOL_GPL(nfs_alloc_fattr_with_label);
1624
nfs_alloc_fhandle(void)1625 struct nfs_fh *nfs_alloc_fhandle(void)
1626 {
1627 struct nfs_fh *fh;
1628
1629 fh = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL);
1630 if (fh != NULL)
1631 fh->size = 0;
1632 return fh;
1633 }
1634 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1635
1636 #ifdef NFS_DEBUG
1637 /*
1638 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1639 * in the same way that wireshark does
1640 *
1641 * @fh: file handle
1642 *
1643 * For debugging only.
1644 */
_nfs_display_fhandle_hash(const struct nfs_fh * fh)1645 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1646 {
1647 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1648 * not on the result */
1649 return nfs_fhandle_hash(fh);
1650 }
1651 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1652
1653 /*
1654 * _nfs_display_fhandle - display an NFS file handle on the console
1655 *
1656 * @fh: file handle to display
1657 * @caption: display caption
1658 *
1659 * For debugging only.
1660 */
_nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)1661 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1662 {
1663 unsigned short i;
1664
1665 if (fh == NULL || fh->size == 0) {
1666 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1667 return;
1668 }
1669
1670 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1671 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1672 for (i = 0; i < fh->size; i += 16) {
1673 __be32 *pos = (__be32 *)&fh->data[i];
1674
1675 switch ((fh->size - i - 1) >> 2) {
1676 case 0:
1677 printk(KERN_DEFAULT " %08x\n",
1678 be32_to_cpup(pos));
1679 break;
1680 case 1:
1681 printk(KERN_DEFAULT " %08x %08x\n",
1682 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1683 break;
1684 case 2:
1685 printk(KERN_DEFAULT " %08x %08x %08x\n",
1686 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1687 be32_to_cpup(pos + 2));
1688 break;
1689 default:
1690 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1691 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1692 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1693 }
1694 }
1695 }
1696 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1697 #endif
1698
1699 /**
1700 * nfs_inode_attrs_cmp_generic - compare attributes
1701 * @fattr: attributes
1702 * @inode: pointer to inode
1703 *
1704 * Attempt to divine whether or not an RPC call reply carrying stale
1705 * attributes got scheduled after another call carrying updated ones.
1706 * Note also the check for wraparound of 'attr_gencount'
1707 *
1708 * The function returns '1' if it thinks the attributes in @fattr are
1709 * more recent than the ones cached in @inode. Otherwise it returns
1710 * the value '0'.
1711 */
nfs_inode_attrs_cmp_generic(const struct nfs_fattr * fattr,const struct inode * inode)1712 static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr,
1713 const struct inode *inode)
1714 {
1715 unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1716
1717 return (long)(fattr->gencount - attr_gencount) > 0 ||
1718 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1719 }
1720
1721 /**
1722 * nfs_inode_attrs_cmp_monotonic - compare attributes
1723 * @fattr: attributes
1724 * @inode: pointer to inode
1725 *
1726 * Attempt to divine whether or not an RPC call reply carrying stale
1727 * attributes got scheduled after another call carrying updated ones.
1728 *
1729 * We assume that the server observes monotonic semantics for
1730 * the change attribute, so a larger value means that the attributes in
1731 * @fattr are more recent, in which case the function returns the
1732 * value '1'.
1733 * A return value of '0' indicates no measurable change
1734 * A return value of '-1' means that the attributes in @inode are
1735 * more recent.
1736 */
nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr * fattr,const struct inode * inode)1737 static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr,
1738 const struct inode *inode)
1739 {
1740 s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode);
1741 if (diff > 0)
1742 return 1;
1743 return diff == 0 ? 0 : -1;
1744 }
1745
1746 /**
1747 * nfs_inode_attrs_cmp_strict_monotonic - compare attributes
1748 * @fattr: attributes
1749 * @inode: pointer to inode
1750 *
1751 * Attempt to divine whether or not an RPC call reply carrying stale
1752 * attributes got scheduled after another call carrying updated ones.
1753 *
1754 * We assume that the server observes strictly monotonic semantics for
1755 * the change attribute, so a larger value means that the attributes in
1756 * @fattr are more recent, in which case the function returns the
1757 * value '1'.
1758 * A return value of '-1' means that the attributes in @inode are
1759 * more recent or unchanged.
1760 */
nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr * fattr,const struct inode * inode)1761 static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr,
1762 const struct inode *inode)
1763 {
1764 return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1;
1765 }
1766
1767 /**
1768 * nfs_inode_attrs_cmp - compare attributes
1769 * @fattr: attributes
1770 * @inode: pointer to inode
1771 *
1772 * This function returns '1' if it thinks the attributes in @fattr are
1773 * more recent than the ones cached in @inode. It returns '-1' if
1774 * the attributes in @inode are more recent than the ones in @fattr,
1775 * and it returns 0 if not sure.
1776 */
nfs_inode_attrs_cmp(const struct nfs_fattr * fattr,const struct inode * inode)1777 static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr,
1778 const struct inode *inode)
1779 {
1780 if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0)
1781 return 1;
1782 switch (NFS_SERVER(inode)->change_attr_type) {
1783 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1784 break;
1785 case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
1786 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1787 break;
1788 return nfs_inode_attrs_cmp_monotonic(fattr, inode);
1789 default:
1790 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1791 break;
1792 return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode);
1793 }
1794 return 0;
1795 }
1796
1797 /**
1798 * nfs_inode_finish_partial_attr_update - complete a previous inode update
1799 * @fattr: attributes
1800 * @inode: pointer to inode
1801 *
1802 * Returns '1' if the last attribute update left the inode cached
1803 * attributes in a partially unrevalidated state, and @fattr
1804 * matches the change attribute of that partial update.
1805 * Otherwise returns '0'.
1806 */
nfs_inode_finish_partial_attr_update(const struct nfs_fattr * fattr,const struct inode * inode)1807 static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr,
1808 const struct inode *inode)
1809 {
1810 const unsigned long check_valid =
1811 NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME |
1812 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
1813 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER |
1814 NFS_INO_INVALID_NLINK;
1815 unsigned long cache_validity = NFS_I(inode)->cache_validity;
1816 enum nfs4_change_attr_type ctype = NFS_SERVER(inode)->change_attr_type;
1817
1818 if (ctype != NFS4_CHANGE_TYPE_IS_UNDEFINED &&
1819 !(cache_validity & NFS_INO_INVALID_CHANGE) &&
1820 (cache_validity & check_valid) != 0 &&
1821 (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1822 nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0)
1823 return 1;
1824 return 0;
1825 }
1826
nfs_refresh_inode_locked(struct inode * inode,struct nfs_fattr * fattr)1827 static int nfs_refresh_inode_locked(struct inode *inode,
1828 struct nfs_fattr *fattr)
1829 {
1830 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
1831 int ret = 0;
1832
1833 trace_nfs_refresh_inode_enter(inode);
1834
1835 if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode))
1836 ret = nfs_update_inode(inode, fattr);
1837 else if (attr_cmp == 0)
1838 ret = nfs_check_inode_attributes(inode, fattr);
1839
1840 trace_nfs_refresh_inode_exit(inode, ret);
1841 return ret;
1842 }
1843
1844 /**
1845 * nfs_refresh_inode - try to update the inode attribute cache
1846 * @inode: pointer to inode
1847 * @fattr: updated attributes
1848 *
1849 * Check that an RPC call that returned attributes has not overlapped with
1850 * other recent updates of the inode metadata, then decide whether it is
1851 * safe to do a full update of the inode attributes, or whether just to
1852 * call nfs_check_inode_attributes.
1853 */
nfs_refresh_inode(struct inode * inode,struct nfs_fattr * fattr)1854 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1855 {
1856 int status;
1857
1858 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1859 return 0;
1860 spin_lock(&inode->i_lock);
1861 status = nfs_refresh_inode_locked(inode, fattr);
1862 spin_unlock(&inode->i_lock);
1863
1864 return status;
1865 }
1866 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1867
nfs_post_op_update_inode_locked(struct inode * inode,struct nfs_fattr * fattr,unsigned int invalid)1868 static int nfs_post_op_update_inode_locked(struct inode *inode,
1869 struct nfs_fattr *fattr, unsigned int invalid)
1870 {
1871 if (S_ISDIR(inode->i_mode))
1872 invalid |= NFS_INO_INVALID_DATA;
1873 nfs_set_cache_invalid(inode, invalid);
1874 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1875 return 0;
1876 return nfs_refresh_inode_locked(inode, fattr);
1877 }
1878
1879 /**
1880 * nfs_post_op_update_inode - try to update the inode attribute cache
1881 * @inode: pointer to inode
1882 * @fattr: updated attributes
1883 *
1884 * After an operation that has changed the inode metadata, mark the
1885 * attribute cache as being invalid, then try to update it.
1886 *
1887 * NB: if the server didn't return any post op attributes, this
1888 * function will force the retrieval of attributes before the next
1889 * NFS request. Thus it should be used only for operations that
1890 * are expected to change one or more attributes, to avoid
1891 * unnecessary NFS requests and trips through nfs_update_inode().
1892 */
nfs_post_op_update_inode(struct inode * inode,struct nfs_fattr * fattr)1893 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1894 {
1895 int status;
1896
1897 spin_lock(&inode->i_lock);
1898 nfs_fattr_set_barrier(fattr);
1899 status = nfs_post_op_update_inode_locked(inode, fattr,
1900 NFS_INO_INVALID_CHANGE
1901 | NFS_INO_INVALID_CTIME
1902 | NFS_INO_REVAL_FORCED);
1903 spin_unlock(&inode->i_lock);
1904
1905 return status;
1906 }
1907 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1908
1909 /**
1910 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1911 * @inode: pointer to inode
1912 * @fattr: updated attributes
1913 *
1914 * After an operation that has changed the inode metadata, mark the
1915 * attribute cache as being invalid, then try to update it. Fake up
1916 * weak cache consistency data, if none exist.
1917 *
1918 * This function is mainly designed to be used by the ->write_done() functions.
1919 */
nfs_post_op_update_inode_force_wcc_locked(struct inode * inode,struct nfs_fattr * fattr)1920 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1921 {
1922 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
1923 int status;
1924
1925 /* Don't do a WCC update if these attributes are already stale */
1926 if (attr_cmp < 0)
1927 return 0;
1928 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) {
1929 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1930 | NFS_ATTR_FATTR_PRESIZE
1931 | NFS_ATTR_FATTR_PREMTIME
1932 | NFS_ATTR_FATTR_PRECTIME);
1933 goto out_noforce;
1934 }
1935 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1936 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1937 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1938 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1939 }
1940 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1941 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1942 fattr->pre_ctime = inode->i_ctime;
1943 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1944 }
1945 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1946 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1947 fattr->pre_mtime = inode->i_mtime;
1948 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1949 }
1950 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1951 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1952 fattr->pre_size = i_size_read(inode);
1953 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1954 }
1955 out_noforce:
1956 status = nfs_post_op_update_inode_locked(inode, fattr,
1957 NFS_INO_INVALID_CHANGE
1958 | NFS_INO_INVALID_CTIME
1959 | NFS_INO_INVALID_MTIME
1960 | NFS_INO_INVALID_BLOCKS);
1961 return status;
1962 }
1963
1964 /**
1965 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1966 * @inode: pointer to inode
1967 * @fattr: updated attributes
1968 *
1969 * After an operation that has changed the inode metadata, mark the
1970 * attribute cache as being invalid, then try to update it. Fake up
1971 * weak cache consistency data, if none exist.
1972 *
1973 * This function is mainly designed to be used by the ->write_done() functions.
1974 */
nfs_post_op_update_inode_force_wcc(struct inode * inode,struct nfs_fattr * fattr)1975 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1976 {
1977 int status;
1978
1979 spin_lock(&inode->i_lock);
1980 nfs_fattr_set_barrier(fattr);
1981 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1982 spin_unlock(&inode->i_lock);
1983 return status;
1984 }
1985 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1986
1987
1988 /*
1989 * Many nfs protocol calls return the new file attributes after
1990 * an operation. Here we update the inode to reflect the state
1991 * of the server's inode.
1992 *
1993 * This is a bit tricky because we have to make sure all dirty pages
1994 * have been sent off to the server before calling invalidate_inode_pages.
1995 * To make sure no other process adds more write requests while we try
1996 * our best to flush them, we make them sleep during the attribute refresh.
1997 *
1998 * A very similar scenario holds for the dir cache.
1999 */
nfs_update_inode(struct inode * inode,struct nfs_fattr * fattr)2000 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2001 {
2002 struct nfs_server *server = NFS_SERVER(inode);
2003 struct nfs_inode *nfsi = NFS_I(inode);
2004 loff_t cur_isize, new_isize;
2005 u64 fattr_supported = server->fattr_valid;
2006 unsigned long invalid = 0;
2007 unsigned long now = jiffies;
2008 unsigned long save_cache_validity;
2009 bool have_writers = nfs_file_has_buffered_writers(nfsi);
2010 bool cache_revalidated = true;
2011 bool attr_changed = false;
2012 bool have_delegation;
2013
2014 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
2015 __func__, inode->i_sb->s_id, inode->i_ino,
2016 nfs_display_fhandle_hash(NFS_FH(inode)),
2017 atomic_read(&inode->i_count), fattr->valid);
2018
2019 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
2020 /* Only a mounted-on-fileid? Just exit */
2021 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
2022 return 0;
2023 /* Has the inode gone and changed behind our back? */
2024 } else if (nfsi->fileid != fattr->fileid) {
2025 /* Is this perhaps the mounted-on fileid? */
2026 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
2027 nfsi->fileid == fattr->mounted_on_fileid)
2028 return 0;
2029 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
2030 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
2031 NFS_SERVER(inode)->nfs_client->cl_hostname,
2032 inode->i_sb->s_id, (long long)nfsi->fileid,
2033 (long long)fattr->fileid);
2034 goto out_err;
2035 }
2036
2037 /*
2038 * Make sure the inode's type hasn't changed.
2039 */
2040 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
2041 /*
2042 * Big trouble! The inode has become a different object.
2043 */
2044 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
2045 __func__, inode->i_ino, inode->i_mode, fattr->mode);
2046 goto out_err;
2047 }
2048
2049 /* Update the fsid? */
2050 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
2051 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
2052 !IS_AUTOMOUNT(inode))
2053 server->fsid = fattr->fsid;
2054
2055 /* Save the delegation state before clearing cache_validity */
2056 have_delegation = nfs_have_delegated_attributes(inode);
2057
2058 /*
2059 * Update the read time so we don't revalidate too often.
2060 */
2061 nfsi->read_cache_jiffies = fattr->time_start;
2062
2063 save_cache_validity = nfsi->cache_validity;
2064 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
2065 | NFS_INO_INVALID_ATIME
2066 | NFS_INO_REVAL_FORCED
2067 | NFS_INO_INVALID_BLOCKS);
2068
2069 /* Do atomic weak cache consistency updates */
2070 nfs_wcc_update_inode(inode, fattr);
2071
2072 if (pnfs_layoutcommit_outstanding(inode)) {
2073 nfsi->cache_validity |=
2074 save_cache_validity &
2075 (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
2076 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
2077 NFS_INO_INVALID_BLOCKS);
2078 cache_revalidated = false;
2079 }
2080
2081 /* More cache consistency checks */
2082 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
2083 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
2084 /* Could it be a race with writeback? */
2085 if (!(have_writers || have_delegation)) {
2086 invalid |= NFS_INO_INVALID_DATA
2087 | NFS_INO_INVALID_ACCESS
2088 | NFS_INO_INVALID_ACL
2089 | NFS_INO_INVALID_XATTR;
2090 /* Force revalidate of all attributes */
2091 save_cache_validity |= NFS_INO_INVALID_CTIME
2092 | NFS_INO_INVALID_MTIME
2093 | NFS_INO_INVALID_SIZE
2094 | NFS_INO_INVALID_BLOCKS
2095 | NFS_INO_INVALID_NLINK
2096 | NFS_INO_INVALID_MODE
2097 | NFS_INO_INVALID_OTHER;
2098 if (S_ISDIR(inode->i_mode))
2099 nfs_force_lookup_revalidate(inode);
2100 attr_changed = true;
2101 dprintk("NFS: change_attr change on server for file %s/%ld\n",
2102 inode->i_sb->s_id,
2103 inode->i_ino);
2104 } else if (!have_delegation)
2105 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
2106 inode_set_iversion_raw(inode, fattr->change_attr);
2107 }
2108 } else {
2109 nfsi->cache_validity |=
2110 save_cache_validity & NFS_INO_INVALID_CHANGE;
2111 if (!have_delegation ||
2112 (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0)
2113 cache_revalidated = false;
2114 }
2115
2116 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
2117 inode->i_mtime = fattr->mtime;
2118 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
2119 nfsi->cache_validity |=
2120 save_cache_validity & NFS_INO_INVALID_MTIME;
2121
2122 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
2123 inode->i_ctime = fattr->ctime;
2124 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
2125 nfsi->cache_validity |=
2126 save_cache_validity & NFS_INO_INVALID_CTIME;
2127
2128 /* Check if our cached file size is stale */
2129 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
2130 new_isize = nfs_size_to_loff_t(fattr->size);
2131 cur_isize = i_size_read(inode);
2132 if (new_isize != cur_isize && !have_delegation) {
2133 /* Do we perhaps have any outstanding writes, or has
2134 * the file grown beyond our last write? */
2135 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
2136 i_size_write(inode, new_isize);
2137 if (!have_writers)
2138 invalid |= NFS_INO_INVALID_DATA;
2139 }
2140 dprintk("NFS: isize change on server for file %s/%ld "
2141 "(%Ld to %Ld)\n",
2142 inode->i_sb->s_id,
2143 inode->i_ino,
2144 (long long)cur_isize,
2145 (long long)new_isize);
2146 }
2147 if (new_isize == 0 &&
2148 !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED |
2149 NFS_ATTR_FATTR_BLOCKS_USED))) {
2150 fattr->du.nfs3.used = 0;
2151 fattr->valid |= NFS_ATTR_FATTR_SPACE_USED;
2152 }
2153 } else
2154 nfsi->cache_validity |=
2155 save_cache_validity & NFS_INO_INVALID_SIZE;
2156
2157 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
2158 inode->i_atime = fattr->atime;
2159 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
2160 nfsi->cache_validity |=
2161 save_cache_validity & NFS_INO_INVALID_ATIME;
2162
2163 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2164 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
2165 umode_t newmode = inode->i_mode & S_IFMT;
2166 newmode |= fattr->mode & S_IALLUGO;
2167 inode->i_mode = newmode;
2168 invalid |= NFS_INO_INVALID_ACCESS
2169 | NFS_INO_INVALID_ACL;
2170 }
2171 } else if (fattr_supported & NFS_ATTR_FATTR_MODE)
2172 nfsi->cache_validity |=
2173 save_cache_validity & NFS_INO_INVALID_MODE;
2174
2175 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2176 if (!uid_eq(inode->i_uid, fattr->uid)) {
2177 invalid |= NFS_INO_INVALID_ACCESS
2178 | NFS_INO_INVALID_ACL;
2179 inode->i_uid = fattr->uid;
2180 }
2181 } else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
2182 nfsi->cache_validity |=
2183 save_cache_validity & NFS_INO_INVALID_OTHER;
2184
2185 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2186 if (!gid_eq(inode->i_gid, fattr->gid)) {
2187 invalid |= NFS_INO_INVALID_ACCESS
2188 | NFS_INO_INVALID_ACL;
2189 inode->i_gid = fattr->gid;
2190 }
2191 } else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
2192 nfsi->cache_validity |=
2193 save_cache_validity & NFS_INO_INVALID_OTHER;
2194
2195 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2196 if (inode->i_nlink != fattr->nlink) {
2197 if (S_ISDIR(inode->i_mode))
2198 invalid |= NFS_INO_INVALID_DATA;
2199 set_nlink(inode, fattr->nlink);
2200 }
2201 } else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
2202 nfsi->cache_validity |=
2203 save_cache_validity & NFS_INO_INVALID_NLINK;
2204
2205 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2206 /*
2207 * report the blocks in 512byte units
2208 */
2209 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2210 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED)
2211 nfsi->cache_validity |=
2212 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2213
2214 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2215 inode->i_blocks = fattr->du.nfs2.blocks;
2216 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED)
2217 nfsi->cache_validity |=
2218 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2219
2220 /* Update attrtimeo value if we're out of the unstable period */
2221 if (attr_changed) {
2222 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2223 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2224 nfsi->attrtimeo_timestamp = now;
2225 /* Set barrier to be more recent than all outstanding updates */
2226 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2227 } else {
2228 if (cache_revalidated) {
2229 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2230 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2231 nfsi->attrtimeo <<= 1;
2232 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2233 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2234 }
2235 nfsi->attrtimeo_timestamp = now;
2236 }
2237 /* Set the barrier to be more recent than this fattr */
2238 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
2239 nfsi->attr_gencount = fattr->gencount;
2240 }
2241
2242 /* Don't invalidate the data if we were to blame */
2243 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2244 || S_ISLNK(inode->i_mode)))
2245 invalid &= ~NFS_INO_INVALID_DATA;
2246 nfs_set_cache_invalid(inode, invalid);
2247
2248 return 0;
2249 out_err:
2250 /*
2251 * No need to worry about unhashing the dentry, as the
2252 * lookup validation will know that the inode is bad.
2253 * (But we fall through to invalidate the caches.)
2254 */
2255 nfs_set_inode_stale_locked(inode);
2256 return -ESTALE;
2257 }
2258
nfs_alloc_inode(struct super_block * sb)2259 struct inode *nfs_alloc_inode(struct super_block *sb)
2260 {
2261 struct nfs_inode *nfsi;
2262 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
2263 if (!nfsi)
2264 return NULL;
2265 nfsi->flags = 0UL;
2266 nfsi->cache_validity = 0UL;
2267 #if IS_ENABLED(CONFIG_NFS_V4)
2268 nfsi->nfs4_acl = NULL;
2269 #endif /* CONFIG_NFS_V4 */
2270 #ifdef CONFIG_NFS_V4_2
2271 nfsi->xattr_cache = NULL;
2272 #endif
2273 return &nfsi->vfs_inode;
2274 }
2275 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2276
nfs_free_inode(struct inode * inode)2277 void nfs_free_inode(struct inode *inode)
2278 {
2279 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2280 }
2281 EXPORT_SYMBOL_GPL(nfs_free_inode);
2282
nfs4_init_once(struct nfs_inode * nfsi)2283 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2284 {
2285 #if IS_ENABLED(CONFIG_NFS_V4)
2286 INIT_LIST_HEAD(&nfsi->open_states);
2287 nfsi->delegation = NULL;
2288 init_rwsem(&nfsi->rwsem);
2289 nfsi->layout = NULL;
2290 #endif
2291 }
2292
init_once(void * foo)2293 static void init_once(void *foo)
2294 {
2295 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2296
2297 inode_init_once(&nfsi->vfs_inode);
2298 INIT_LIST_HEAD(&nfsi->open_files);
2299 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2300 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2301 nfs4_init_once(nfsi);
2302 }
2303
nfs_init_inodecache(void)2304 static int __init nfs_init_inodecache(void)
2305 {
2306 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2307 sizeof(struct nfs_inode),
2308 0, (SLAB_RECLAIM_ACCOUNT|
2309 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2310 init_once);
2311 if (nfs_inode_cachep == NULL)
2312 return -ENOMEM;
2313
2314 return 0;
2315 }
2316
nfs_destroy_inodecache(void)2317 static void nfs_destroy_inodecache(void)
2318 {
2319 /*
2320 * Make sure all delayed rcu free inodes are flushed before we
2321 * destroy cache.
2322 */
2323 rcu_barrier();
2324 kmem_cache_destroy(nfs_inode_cachep);
2325 }
2326
2327 struct workqueue_struct *nfsiod_workqueue;
2328 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2329
2330 /*
2331 * start up the nfsiod workqueue
2332 */
nfsiod_start(void)2333 static int nfsiod_start(void)
2334 {
2335 struct workqueue_struct *wq;
2336 dprintk("RPC: creating workqueue nfsiod\n");
2337 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2338 if (wq == NULL)
2339 return -ENOMEM;
2340 nfsiod_workqueue = wq;
2341 return 0;
2342 }
2343
2344 /*
2345 * Destroy the nfsiod workqueue
2346 */
nfsiod_stop(void)2347 static void nfsiod_stop(void)
2348 {
2349 struct workqueue_struct *wq;
2350
2351 wq = nfsiod_workqueue;
2352 if (wq == NULL)
2353 return;
2354 nfsiod_workqueue = NULL;
2355 destroy_workqueue(wq);
2356 }
2357
2358 unsigned int nfs_net_id;
2359 EXPORT_SYMBOL_GPL(nfs_net_id);
2360
nfs_net_init(struct net * net)2361 static int nfs_net_init(struct net *net)
2362 {
2363 nfs_clients_init(net);
2364 return nfs_fs_proc_net_init(net);
2365 }
2366
nfs_net_exit(struct net * net)2367 static void nfs_net_exit(struct net *net)
2368 {
2369 nfs_fs_proc_net_exit(net);
2370 nfs_clients_exit(net);
2371 }
2372
2373 static struct pernet_operations nfs_net_ops = {
2374 .init = nfs_net_init,
2375 .exit = nfs_net_exit,
2376 .id = &nfs_net_id,
2377 .size = sizeof(struct nfs_net),
2378 };
2379
2380 /*
2381 * Initialize NFS
2382 */
init_nfs_fs(void)2383 static int __init init_nfs_fs(void)
2384 {
2385 int err;
2386
2387 err = nfs_sysfs_init();
2388 if (err < 0)
2389 goto out10;
2390
2391 err = register_pernet_subsys(&nfs_net_ops);
2392 if (err < 0)
2393 goto out9;
2394
2395 err = nfs_fscache_register();
2396 if (err < 0)
2397 goto out8;
2398
2399 err = nfsiod_start();
2400 if (err)
2401 goto out7;
2402
2403 err = nfs_fs_proc_init();
2404 if (err)
2405 goto out6;
2406
2407 err = nfs_init_nfspagecache();
2408 if (err)
2409 goto out5;
2410
2411 err = nfs_init_inodecache();
2412 if (err)
2413 goto out4;
2414
2415 err = nfs_init_readpagecache();
2416 if (err)
2417 goto out3;
2418
2419 err = nfs_init_writepagecache();
2420 if (err)
2421 goto out2;
2422
2423 err = nfs_init_directcache();
2424 if (err)
2425 goto out1;
2426
2427 rpc_proc_register(&init_net, &nfs_rpcstat);
2428
2429 err = register_nfs_fs();
2430 if (err)
2431 goto out0;
2432
2433 return 0;
2434 out0:
2435 rpc_proc_unregister(&init_net, "nfs");
2436 nfs_destroy_directcache();
2437 out1:
2438 nfs_destroy_writepagecache();
2439 out2:
2440 nfs_destroy_readpagecache();
2441 out3:
2442 nfs_destroy_inodecache();
2443 out4:
2444 nfs_destroy_nfspagecache();
2445 out5:
2446 nfs_fs_proc_exit();
2447 out6:
2448 nfsiod_stop();
2449 out7:
2450 nfs_fscache_unregister();
2451 out8:
2452 unregister_pernet_subsys(&nfs_net_ops);
2453 out9:
2454 nfs_sysfs_exit();
2455 out10:
2456 return err;
2457 }
2458
exit_nfs_fs(void)2459 static void __exit exit_nfs_fs(void)
2460 {
2461 nfs_destroy_directcache();
2462 nfs_destroy_writepagecache();
2463 nfs_destroy_readpagecache();
2464 nfs_destroy_inodecache();
2465 nfs_destroy_nfspagecache();
2466 nfs_fscache_unregister();
2467 unregister_pernet_subsys(&nfs_net_ops);
2468 rpc_proc_unregister(&init_net, "nfs");
2469 unregister_nfs_fs();
2470 nfs_fs_proc_exit();
2471 nfsiod_stop();
2472 nfs_sysfs_exit();
2473 }
2474
2475 /* Not quite true; I just maintain it */
2476 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2477 MODULE_LICENSE("GPL");
2478 MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
2479 module_param(enable_ino64, bool, 0644);
2480
2481 module_init(init_nfs_fs)
2482 module_exit(exit_nfs_fs)
2483