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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 */
63static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
64
65static int nfs_update_inode(struct inode *, struct nfs_fattr *);
66
67static struct kmem_cache * nfs_inode_cachep;
68
69static inline unsigned long
70nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
71{
72 return nfs_fileid_to_ino_t(fattr->fileid);
73}
74
75static 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
83int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
84{
85 return nfs_wait_killable(mode);
86}
87EXPORT_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 */
96u64 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
112int nfs_drop_inode(struct inode *inode)
113{
114 return NFS_STALE(inode) || generic_drop_inode(inode);
115}
116EXPORT_SYMBOL_GPL(nfs_drop_inode);
117
118void 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}
129EXPORT_SYMBOL_GPL(nfs_clear_inode);
130
131void 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
138int nfs_sync_inode(struct inode *inode)
139{
140 inode_dio_wait(inode);
141 return nfs_wb_all(inode);
142}
143EXPORT_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 */
149int 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
160static 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
167static 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
175bool 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}
181EXPORT_SYMBOL_GPL(nfs_check_cache_invalid);
182
183#ifdef CONFIG_NFS_V4_2
184static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
185{
186 return nfsi->xattr_cache != NULL;
187}
188#else
189static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
190{
191 return false;
192}
193#endif
194
195void 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 if (inode->i_mapping->nrpages == 0)
214 flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER);
215 flags &= ~(NFS_INO_REVAL_PAGECACHE | NFS_INO_REVAL_FORCED);
216 nfsi->cache_validity |= flags;
217}
218EXPORT_SYMBOL_GPL(nfs_set_cache_invalid);
219
220/*
221 * Invalidate the local caches
222 */
223static void nfs_zap_caches_locked(struct inode *inode)
224{
225 struct nfs_inode *nfsi = NFS_I(inode);
226 int mode = inode->i_mode;
227
228 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
229
230 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
231 nfsi->attrtimeo_timestamp = jiffies;
232
233 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
234 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
235 | NFS_INO_INVALID_DATA
236 | NFS_INO_INVALID_ACCESS
237 | NFS_INO_INVALID_ACL
238 | NFS_INO_INVALID_XATTR
239 | NFS_INO_REVAL_PAGECACHE);
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_INO_REVAL_PAGECACHE);
246 nfs_zap_label_cache_locked(nfsi);
247}
248
249void nfs_zap_caches(struct inode *inode)
250{
251 spin_lock(&inode->i_lock);
252 nfs_zap_caches_locked(inode);
253 spin_unlock(&inode->i_lock);
254}
255
256void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
257{
258 if (mapping->nrpages != 0) {
259 spin_lock(&inode->i_lock);
260 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
261 spin_unlock(&inode->i_lock);
262 }
263}
264
265void nfs_zap_acl_cache(struct inode *inode)
266{
267 void (*clear_acl_cache)(struct inode *);
268
269 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
270 if (clear_acl_cache != NULL)
271 clear_acl_cache(inode);
272 spin_lock(&inode->i_lock);
273 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
274 spin_unlock(&inode->i_lock);
275}
276EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
277
278void nfs_invalidate_atime(struct inode *inode)
279{
280 spin_lock(&inode->i_lock);
281 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
282 spin_unlock(&inode->i_lock);
283}
284EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
285
286/*
287 * Invalidate, but do not unhash, the inode.
288 * NB: must be called with inode->i_lock held!
289 */
290static void nfs_set_inode_stale_locked(struct inode *inode)
291{
292 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
293 nfs_zap_caches_locked(inode);
294 trace_nfs_set_inode_stale(inode);
295}
296
297void nfs_set_inode_stale(struct inode *inode)
298{
299 spin_lock(&inode->i_lock);
300 nfs_set_inode_stale_locked(inode);
301 spin_unlock(&inode->i_lock);
302}
303
304struct nfs_find_desc {
305 struct nfs_fh *fh;
306 struct nfs_fattr *fattr;
307};
308
309/*
310 * In NFSv3 we can have 64bit inode numbers. In order to support
311 * this, and re-exported directories (also seen in NFSv2)
312 * we are forced to allow 2 different inodes to have the same
313 * i_ino.
314 */
315static int
316nfs_find_actor(struct inode *inode, void *opaque)
317{
318 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
319 struct nfs_fh *fh = desc->fh;
320 struct nfs_fattr *fattr = desc->fattr;
321
322 if (NFS_FILEID(inode) != fattr->fileid)
323 return 0;
324 if (inode_wrong_type(inode, fattr->mode))
325 return 0;
326 if (nfs_compare_fh(NFS_FH(inode), fh))
327 return 0;
328 if (is_bad_inode(inode) || NFS_STALE(inode))
329 return 0;
330 return 1;
331}
332
333static int
334nfs_init_locked(struct inode *inode, void *opaque)
335{
336 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
337 struct nfs_fattr *fattr = desc->fattr;
338
339 set_nfs_fileid(inode, fattr->fileid);
340 inode->i_mode = fattr->mode;
341 nfs_copy_fh(NFS_FH(inode), desc->fh);
342 return 0;
343}
344
345#ifdef CONFIG_NFS_V4_SECURITY_LABEL
346static void nfs_clear_label_invalid(struct inode *inode)
347{
348 spin_lock(&inode->i_lock);
349 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
350 spin_unlock(&inode->i_lock);
351}
352
353void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
354 struct nfs4_label *label)
355{
356 int error;
357
358 if (label == NULL)
359 return;
360
361 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
362 error = security_inode_notifysecctx(inode, label->label,
363 label->len);
364 if (error)
365 printk(KERN_ERR "%s() %s %d "
366 "security_inode_notifysecctx() %d\n",
367 __func__,
368 (char *)label->label,
369 label->len, error);
370 nfs_clear_label_invalid(inode);
371 }
372}
373
374struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
375{
376 struct nfs4_label *label = NULL;
377 int minor_version = server->nfs_client->cl_minorversion;
378
379 if (minor_version < 2)
380 return label;
381
382 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
383 return label;
384
385 label = kzalloc(sizeof(struct nfs4_label), flags);
386 if (label == NULL)
387 return ERR_PTR(-ENOMEM);
388
389 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
390 if (label->label == NULL) {
391 kfree(label);
392 return ERR_PTR(-ENOMEM);
393 }
394 label->len = NFS4_MAXLABELLEN;
395
396 return label;
397}
398EXPORT_SYMBOL_GPL(nfs4_label_alloc);
399#else
400void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
401 struct nfs4_label *label)
402{
403}
404#endif
405EXPORT_SYMBOL_GPL(nfs_setsecurity);
406
407/* Search for inode identified by fh, fileid and i_mode in inode cache. */
408struct inode *
409nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
410{
411 struct nfs_find_desc desc = {
412 .fh = fh,
413 .fattr = fattr,
414 };
415 struct inode *inode;
416 unsigned long hash;
417
418 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
419 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
420 return NULL;
421
422 hash = nfs_fattr_to_ino_t(fattr);
423 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
424
425 dprintk("%s: returning %p\n", __func__, inode);
426 return inode;
427}
428
429/*
430 * This is our front-end to iget that looks up inodes by file handle
431 * instead of inode number.
432 */
433struct inode *
434nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
435{
436 struct nfs_find_desc desc = {
437 .fh = fh,
438 .fattr = fattr
439 };
440 struct inode *inode = ERR_PTR(-ENOENT);
441 u64 fattr_supported = NFS_SB(sb)->fattr_valid;
442 unsigned long hash;
443
444 nfs_attr_check_mountpoint(sb, fattr);
445
446 if (nfs_attr_use_mounted_on_fileid(fattr))
447 fattr->fileid = fattr->mounted_on_fileid;
448 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
449 goto out_no_inode;
450 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
451 goto out_no_inode;
452
453 hash = nfs_fattr_to_ino_t(fattr);
454
455 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
456 if (inode == NULL) {
457 inode = ERR_PTR(-ENOMEM);
458 goto out_no_inode;
459 }
460
461 if (inode->i_state & I_NEW) {
462 struct nfs_inode *nfsi = NFS_I(inode);
463 unsigned long now = jiffies;
464
465 /* We set i_ino for the few things that still rely on it,
466 * such as stat(2) */
467 inode->i_ino = hash;
468
469 /* We can't support update_atime(), since the server will reset it */
470 inode->i_flags |= S_NOATIME|S_NOCMTIME;
471 inode->i_mode = fattr->mode;
472 nfsi->cache_validity = 0;
473 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
474 && (fattr_supported & NFS_ATTR_FATTR_MODE))
475 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE);
476 /* Why so? Because we want revalidate for devices/FIFOs, and
477 * that's precisely what we have in nfs_file_inode_operations.
478 */
479 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
480 if (S_ISREG(inode->i_mode)) {
481 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
482 inode->i_data.a_ops = &nfs_file_aops;
483 } else if (S_ISDIR(inode->i_mode)) {
484 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
485 inode->i_fop = &nfs_dir_operations;
486 inode->i_data.a_ops = &nfs_dir_aops;
487 /* Deal with crossing mountpoints */
488 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
489 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
490 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
491 inode->i_op = &nfs_referral_inode_operations;
492 else
493 inode->i_op = &nfs_mountpoint_inode_operations;
494 inode->i_fop = NULL;
495 inode->i_flags |= S_AUTOMOUNT;
496 }
497 } else if (S_ISLNK(inode->i_mode)) {
498 inode->i_op = &nfs_symlink_inode_operations;
499 inode_nohighmem(inode);
500 } else
501 init_special_inode(inode, inode->i_mode, fattr->rdev);
502
503 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
504 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
505 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
506 inode_set_iversion_raw(inode, 0);
507 inode->i_size = 0;
508 clear_nlink(inode);
509 inode->i_uid = make_kuid(&init_user_ns, -2);
510 inode->i_gid = make_kgid(&init_user_ns, -2);
511 inode->i_blocks = 0;
512 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
513 nfsi->write_io = 0;
514 nfsi->read_io = 0;
515
516 nfsi->read_cache_jiffies = fattr->time_start;
517 nfsi->attr_gencount = fattr->gencount;
518 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
519 inode->i_atime = fattr->atime;
520 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
521 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
522 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
523 inode->i_mtime = fattr->mtime;
524 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
525 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
526 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
527 inode->i_ctime = fattr->ctime;
528 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
529 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
530 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
531 inode_set_iversion_raw(inode, fattr->change_attr);
532 else
533 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
534 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
535 inode->i_size = nfs_size_to_loff_t(fattr->size);
536 else
537 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
538 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
539 set_nlink(inode, fattr->nlink);
540 else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
541 nfs_set_cache_invalid(inode, NFS_INO_INVALID_NLINK);
542 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
543 inode->i_uid = fattr->uid;
544 else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
545 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
546 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
547 inode->i_gid = fattr->gid;
548 else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
549 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
550 if (nfs_server_capable(inode, NFS_CAP_XATTR))
551 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
552 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
553 inode->i_blocks = fattr->du.nfs2.blocks;
554 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED &&
555 fattr->size != 0)
556 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
557 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
558 /*
559 * report the blocks in 512byte units
560 */
561 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
562 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED &&
563 fattr->size != 0)
564 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
565
566 nfs_setsecurity(inode, fattr, label);
567
568 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
569 nfsi->attrtimeo_timestamp = now;
570 nfsi->access_cache = RB_ROOT;
571
572 nfs_fscache_init_inode(inode);
573
574 unlock_new_inode(inode);
575 } else {
576 int err = nfs_refresh_inode(inode, fattr);
577 if (err < 0) {
578 iput(inode);
579 inode = ERR_PTR(err);
580 goto out_no_inode;
581 }
582 }
583 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
584 inode->i_sb->s_id,
585 (unsigned long long)NFS_FILEID(inode),
586 nfs_display_fhandle_hash(fh),
587 atomic_read(&inode->i_count));
588
589out:
590 return inode;
591
592out_no_inode:
593 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
594 goto out;
595}
596EXPORT_SYMBOL_GPL(nfs_fhget);
597
598#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)
599
600int
601nfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
602 struct iattr *attr)
603{
604 struct inode *inode = d_inode(dentry);
605 struct nfs_fattr *fattr;
606 int error = 0;
607
608 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
609
610 /* skip mode change if it's just for clearing setuid/setgid */
611 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
612 attr->ia_valid &= ~ATTR_MODE;
613
614 if (attr->ia_valid & ATTR_SIZE) {
615 BUG_ON(!S_ISREG(inode->i_mode));
616
617 error = inode_newsize_ok(inode, attr->ia_size);
618 if (error)
619 return error;
620
621 if (attr->ia_size == i_size_read(inode))
622 attr->ia_valid &= ~ATTR_SIZE;
623 }
624
625 /* Optimization: if the end result is no change, don't RPC */
626 if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0)
627 return 0;
628
629 trace_nfs_setattr_enter(inode);
630
631 /* Write all dirty data */
632 if (S_ISREG(inode->i_mode))
633 nfs_sync_inode(inode);
634
635 fattr = nfs_alloc_fattr();
636 if (fattr == NULL) {
637 error = -ENOMEM;
638 goto out;
639 }
640
641 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
642 if (error == 0)
643 error = nfs_refresh_inode(inode, fattr);
644 nfs_free_fattr(fattr);
645out:
646 trace_nfs_setattr_exit(inode, error);
647 return error;
648}
649EXPORT_SYMBOL_GPL(nfs_setattr);
650
651/**
652 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
653 * @inode: inode of the file used
654 * @offset: file offset to start truncating
655 *
656 * This is a copy of the common vmtruncate, but with the locking
657 * corrected to take into account the fact that NFS requires
658 * inode->i_size to be updated under the inode->i_lock.
659 * Note: must be called with inode->i_lock held!
660 */
661static int nfs_vmtruncate(struct inode * inode, loff_t offset)
662{
663 int err;
664
665 err = inode_newsize_ok(inode, offset);
666 if (err)
667 goto out;
668
669 i_size_write(inode, offset);
670 /* Optimisation */
671 if (offset == 0)
672 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA |
673 NFS_INO_DATA_INVAL_DEFER);
674 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
675
676 spin_unlock(&inode->i_lock);
677 truncate_pagecache(inode, offset);
678 spin_lock(&inode->i_lock);
679out:
680 return err;
681}
682
683/**
684 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
685 * @inode: pointer to struct inode
686 * @attr: pointer to struct iattr
687 * @fattr: pointer to struct nfs_fattr
688 *
689 * Note: we do this in the *proc.c in order to ensure that
690 * it works for things like exclusive creates too.
691 */
692void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
693 struct nfs_fattr *fattr)
694{
695 /* Barrier: bump the attribute generation count. */
696 nfs_fattr_set_barrier(fattr);
697
698 spin_lock(&inode->i_lock);
699 NFS_I(inode)->attr_gencount = fattr->gencount;
700 if ((attr->ia_valid & ATTR_SIZE) != 0) {
701 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME |
702 NFS_INO_INVALID_BLOCKS);
703 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
704 nfs_vmtruncate(inode, attr->ia_size);
705 }
706 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
707 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
708 if ((attr->ia_valid & ATTR_KILL_SUID) != 0 &&
709 inode->i_mode & S_ISUID)
710 inode->i_mode &= ~S_ISUID;
711 if ((attr->ia_valid & ATTR_KILL_SGID) != 0 &&
712 (inode->i_mode & (S_ISGID | S_IXGRP)) ==
713 (S_ISGID | S_IXGRP))
714 inode->i_mode &= ~S_ISGID;
715 if ((attr->ia_valid & ATTR_MODE) != 0) {
716 int mode = attr->ia_mode & S_IALLUGO;
717 mode |= inode->i_mode & ~S_IALLUGO;
718 inode->i_mode = mode;
719 }
720 if ((attr->ia_valid & ATTR_UID) != 0)
721 inode->i_uid = attr->ia_uid;
722 if ((attr->ia_valid & ATTR_GID) != 0)
723 inode->i_gid = attr->ia_gid;
724 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
725 inode->i_ctime = fattr->ctime;
726 else
727 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
728 | NFS_INO_INVALID_CTIME);
729 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
730 | NFS_INO_INVALID_ACL);
731 }
732 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
733 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
734 | NFS_INO_INVALID_CTIME);
735 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
736 inode->i_atime = fattr->atime;
737 else if (attr->ia_valid & ATTR_ATIME_SET)
738 inode->i_atime = attr->ia_atime;
739 else
740 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
741
742 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
743 inode->i_ctime = fattr->ctime;
744 else
745 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
746 | NFS_INO_INVALID_CTIME);
747 }
748 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
749 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
750 | NFS_INO_INVALID_CTIME);
751 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
752 inode->i_mtime = fattr->mtime;
753 else if (attr->ia_valid & ATTR_MTIME_SET)
754 inode->i_mtime = attr->ia_mtime;
755 else
756 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
757
758 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
759 inode->i_ctime = fattr->ctime;
760 else
761 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
762 | NFS_INO_INVALID_CTIME);
763 }
764 if (fattr->valid)
765 nfs_update_inode(inode, fattr);
766 spin_unlock(&inode->i_lock);
767}
768EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
769
770static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
771{
772 struct dentry *parent;
773
774 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
775 return;
776 parent = dget_parent(dentry);
777 nfs_force_use_readdirplus(d_inode(parent));
778 dput(parent);
779}
780
781static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
782{
783 struct dentry *parent;
784
785 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
786 return;
787 parent = dget_parent(dentry);
788 nfs_advise_use_readdirplus(d_inode(parent));
789 dput(parent);
790}
791
792static u32 nfs_get_valid_attrmask(struct inode *inode)
793{
794 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
795 u32 reply_mask = STATX_INO | STATX_TYPE;
796
797 if (!(cache_validity & NFS_INO_INVALID_ATIME))
798 reply_mask |= STATX_ATIME;
799 if (!(cache_validity & NFS_INO_INVALID_CTIME))
800 reply_mask |= STATX_CTIME;
801 if (!(cache_validity & NFS_INO_INVALID_MTIME))
802 reply_mask |= STATX_MTIME;
803 if (!(cache_validity & NFS_INO_INVALID_SIZE))
804 reply_mask |= STATX_SIZE;
805 if (!(cache_validity & NFS_INO_INVALID_NLINK))
806 reply_mask |= STATX_NLINK;
807 if (!(cache_validity & NFS_INO_INVALID_MODE))
808 reply_mask |= STATX_MODE;
809 if (!(cache_validity & NFS_INO_INVALID_OTHER))
810 reply_mask |= STATX_UID | STATX_GID;
811 if (!(cache_validity & NFS_INO_INVALID_BLOCKS))
812 reply_mask |= STATX_BLOCKS;
813 return reply_mask;
814}
815
816int nfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
817 struct kstat *stat, u32 request_mask, unsigned int query_flags)
818{
819 struct inode *inode = d_inode(path->dentry);
820 struct nfs_server *server = NFS_SERVER(inode);
821 unsigned long cache_validity;
822 int err = 0;
823 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
824 bool do_update = false;
825
826 trace_nfs_getattr_enter(inode);
827
828 request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID |
829 STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME |
830 STATX_INO | STATX_SIZE | STATX_BLOCKS;
831
832 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
833 nfs_readdirplus_parent_cache_hit(path->dentry);
834 goto out_no_revalidate;
835 }
836
837 /* Flush out writes to the server in order to update c/mtime. */
838 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
839 S_ISREG(inode->i_mode)) {
840 err = filemap_write_and_wait(inode->i_mapping);
841 if (err)
842 goto out;
843 }
844
845 /*
846 * We may force a getattr if the user cares about atime.
847 *
848 * Note that we only have to check the vfsmount flags here:
849 * - NFS always sets S_NOATIME by so checking it would give a
850 * bogus result
851 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
852 * no point in checking those.
853 */
854 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
855 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
856 request_mask &= ~STATX_ATIME;
857
858 /* Is the user requesting attributes that might need revalidation? */
859 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
860 STATX_MTIME|STATX_UID|STATX_GID|
861 STATX_SIZE|STATX_BLOCKS)))
862 goto out_no_revalidate;
863
864 /* Check whether the cached attributes are stale */
865 do_update |= force_sync || nfs_attribute_cache_expired(inode);
866 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
867 do_update |= cache_validity & NFS_INO_INVALID_CHANGE;
868 if (request_mask & STATX_ATIME)
869 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
870 if (request_mask & STATX_CTIME)
871 do_update |= cache_validity & NFS_INO_INVALID_CTIME;
872 if (request_mask & STATX_MTIME)
873 do_update |= cache_validity & NFS_INO_INVALID_MTIME;
874 if (request_mask & STATX_SIZE)
875 do_update |= cache_validity & NFS_INO_INVALID_SIZE;
876 if (request_mask & STATX_NLINK)
877 do_update |= cache_validity & NFS_INO_INVALID_NLINK;
878 if (request_mask & STATX_MODE)
879 do_update |= cache_validity & NFS_INO_INVALID_MODE;
880 if (request_mask & (STATX_UID | STATX_GID))
881 do_update |= cache_validity & NFS_INO_INVALID_OTHER;
882 if (request_mask & STATX_BLOCKS)
883 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
884
885 if (do_update) {
886 /* Update the attribute cache */
887 if (!(server->flags & NFS_MOUNT_NOAC))
888 nfs_readdirplus_parent_cache_miss(path->dentry);
889 else
890 nfs_readdirplus_parent_cache_hit(path->dentry);
891 err = __nfs_revalidate_inode(server, inode);
892 if (err)
893 goto out;
894 } else
895 nfs_readdirplus_parent_cache_hit(path->dentry);
896out_no_revalidate:
897 /* Only return attributes that were revalidated. */
898 stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask;
899
900 generic_fillattr(&init_user_ns, inode, stat);
901 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
902 if (S_ISDIR(inode->i_mode))
903 stat->blksize = NFS_SERVER(inode)->dtsize;
904out:
905 trace_nfs_getattr_exit(inode, err);
906 return err;
907}
908EXPORT_SYMBOL_GPL(nfs_getattr);
909
910static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
911{
912 refcount_set(&l_ctx->count, 1);
913 l_ctx->lockowner = current->files;
914 INIT_LIST_HEAD(&l_ctx->list);
915 atomic_set(&l_ctx->io_count, 0);
916}
917
918static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
919{
920 struct nfs_lock_context *pos;
921
922 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
923 if (pos->lockowner != current->files)
924 continue;
925 if (refcount_inc_not_zero(&pos->count))
926 return pos;
927 }
928 return NULL;
929}
930
931struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
932{
933 struct nfs_lock_context *res, *new = NULL;
934 struct inode *inode = d_inode(ctx->dentry);
935
936 rcu_read_lock();
937 res = __nfs_find_lock_context(ctx);
938 rcu_read_unlock();
939 if (res == NULL) {
940 new = kmalloc(sizeof(*new), GFP_KERNEL);
941 if (new == NULL)
942 return ERR_PTR(-ENOMEM);
943 nfs_init_lock_context(new);
944 spin_lock(&inode->i_lock);
945 res = __nfs_find_lock_context(ctx);
946 if (res == NULL) {
947 new->open_context = get_nfs_open_context(ctx);
948 if (new->open_context) {
949 list_add_tail_rcu(&new->list,
950 &ctx->lock_context.list);
951 res = new;
952 new = NULL;
953 } else
954 res = ERR_PTR(-EBADF);
955 }
956 spin_unlock(&inode->i_lock);
957 kfree(new);
958 }
959 return res;
960}
961EXPORT_SYMBOL_GPL(nfs_get_lock_context);
962
963void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
964{
965 struct nfs_open_context *ctx = l_ctx->open_context;
966 struct inode *inode = d_inode(ctx->dentry);
967
968 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
969 return;
970 list_del_rcu(&l_ctx->list);
971 spin_unlock(&inode->i_lock);
972 put_nfs_open_context(ctx);
973 kfree_rcu(l_ctx, rcu_head);
974}
975EXPORT_SYMBOL_GPL(nfs_put_lock_context);
976
977/**
978 * nfs_close_context - Common close_context() routine NFSv2/v3
979 * @ctx: pointer to context
980 * @is_sync: is this a synchronous close
981 *
982 * Ensure that the attributes are up to date if we're mounted
983 * with close-to-open semantics and we have cached data that will
984 * need to be revalidated on open.
985 */
986void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
987{
988 struct nfs_inode *nfsi;
989 struct inode *inode;
990
991 if (!(ctx->mode & FMODE_WRITE))
992 return;
993 if (!is_sync)
994 return;
995 inode = d_inode(ctx->dentry);
996 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
997 return;
998 nfsi = NFS_I(inode);
999 if (inode->i_mapping->nrpages == 0)
1000 return;
1001 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1002 return;
1003 if (!list_empty(&nfsi->open_files))
1004 return;
1005 if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO)
1006 return;
1007 nfs_revalidate_inode(inode,
1008 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
1009}
1010EXPORT_SYMBOL_GPL(nfs_close_context);
1011
1012struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
1013 fmode_t f_mode,
1014 struct file *filp)
1015{
1016 struct nfs_open_context *ctx;
1017
1018 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
1019 if (!ctx)
1020 return ERR_PTR(-ENOMEM);
1021 nfs_sb_active(dentry->d_sb);
1022 ctx->dentry = dget(dentry);
1023 if (filp)
1024 ctx->cred = get_cred(filp->f_cred);
1025 else
1026 ctx->cred = get_current_cred();
1027 ctx->ll_cred = NULL;
1028 ctx->state = NULL;
1029 ctx->mode = f_mode;
1030 ctx->flags = 0;
1031 ctx->error = 0;
1032 ctx->flock_owner = (fl_owner_t)filp;
1033 nfs_init_lock_context(&ctx->lock_context);
1034 ctx->lock_context.open_context = ctx;
1035 INIT_LIST_HEAD(&ctx->list);
1036 ctx->mdsthreshold = NULL;
1037 return ctx;
1038}
1039EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1040
1041struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1042{
1043 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1044 return ctx;
1045 return NULL;
1046}
1047EXPORT_SYMBOL_GPL(get_nfs_open_context);
1048
1049static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1050{
1051 struct inode *inode = d_inode(ctx->dentry);
1052 struct super_block *sb = ctx->dentry->d_sb;
1053
1054 if (!refcount_dec_and_test(&ctx->lock_context.count))
1055 return;
1056 if (!list_empty(&ctx->list)) {
1057 spin_lock(&inode->i_lock);
1058 list_del_rcu(&ctx->list);
1059 spin_unlock(&inode->i_lock);
1060 }
1061 if (inode != NULL)
1062 NFS_PROTO(inode)->close_context(ctx, is_sync);
1063 put_cred(ctx->cred);
1064 dput(ctx->dentry);
1065 nfs_sb_deactive(sb);
1066 put_rpccred(ctx->ll_cred);
1067 kfree(ctx->mdsthreshold);
1068 kfree_rcu(ctx, rcu_head);
1069}
1070
1071void put_nfs_open_context(struct nfs_open_context *ctx)
1072{
1073 __put_nfs_open_context(ctx, 0);
1074}
1075EXPORT_SYMBOL_GPL(put_nfs_open_context);
1076
1077static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1078{
1079 __put_nfs_open_context(ctx, 1);
1080}
1081
1082/*
1083 * Ensure that mmap has a recent RPC credential for use when writing out
1084 * shared pages
1085 */
1086void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1087{
1088 struct inode *inode = d_inode(ctx->dentry);
1089 struct nfs_inode *nfsi = NFS_I(inode);
1090
1091 spin_lock(&inode->i_lock);
1092 if (list_empty(&nfsi->open_files) &&
1093 (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER))
1094 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA |
1095 NFS_INO_REVAL_FORCED);
1096 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1097 spin_unlock(&inode->i_lock);
1098}
1099EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1100
1101void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1102{
1103 filp->private_data = get_nfs_open_context(ctx);
1104 set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1105 if (list_empty(&ctx->list))
1106 nfs_inode_attach_open_context(ctx);
1107}
1108EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1109
1110/*
1111 * Given an inode, search for an open context with the desired characteristics
1112 */
1113struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1114{
1115 struct nfs_inode *nfsi = NFS_I(inode);
1116 struct nfs_open_context *pos, *ctx = NULL;
1117
1118 rcu_read_lock();
1119 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1120 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1121 continue;
1122 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1123 continue;
1124 if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags))
1125 continue;
1126 ctx = get_nfs_open_context(pos);
1127 if (ctx)
1128 break;
1129 }
1130 rcu_read_unlock();
1131 return ctx;
1132}
1133
1134void nfs_file_clear_open_context(struct file *filp)
1135{
1136 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1137
1138 if (ctx) {
1139 struct inode *inode = d_inode(ctx->dentry);
1140
1141 clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1142 /*
1143 * We fatal error on write before. Try to writeback
1144 * every page again.
1145 */
1146 if (ctx->error < 0)
1147 invalidate_inode_pages2(inode->i_mapping);
1148 filp->private_data = NULL;
1149 put_nfs_open_context_sync(ctx);
1150 }
1151}
1152
1153/*
1154 * These allocate and release file read/write context information.
1155 */
1156int nfs_open(struct inode *inode, struct file *filp)
1157{
1158 struct nfs_open_context *ctx;
1159
1160 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
1161 if (IS_ERR(ctx))
1162 return PTR_ERR(ctx);
1163 nfs_file_set_open_context(filp, ctx);
1164 put_nfs_open_context(ctx);
1165 nfs_fscache_open_file(inode, filp);
1166 return 0;
1167}
1168EXPORT_SYMBOL_GPL(nfs_open);
1169
1170/*
1171 * This function is called whenever some part of NFS notices that
1172 * the cached attributes have to be refreshed.
1173 */
1174int
1175__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1176{
1177 int status = -ESTALE;
1178 struct nfs4_label *label = NULL;
1179 struct nfs_fattr *fattr = NULL;
1180 struct nfs_inode *nfsi = NFS_I(inode);
1181
1182 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1183 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1184
1185 trace_nfs_revalidate_inode_enter(inode);
1186
1187 if (is_bad_inode(inode))
1188 goto out;
1189 if (NFS_STALE(inode))
1190 goto out;
1191
1192 /* pNFS: Attributes aren't updated until we layoutcommit */
1193 if (S_ISREG(inode->i_mode)) {
1194 status = pnfs_sync_inode(inode, false);
1195 if (status)
1196 goto out;
1197 }
1198
1199 status = -ENOMEM;
1200 fattr = nfs_alloc_fattr();
1201 if (fattr == NULL)
1202 goto out;
1203
1204 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1205
1206 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1207 if (IS_ERR(label)) {
1208 status = PTR_ERR(label);
1209 goto out;
1210 }
1211
1212 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1213 label, inode);
1214 if (status != 0) {
1215 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1216 inode->i_sb->s_id,
1217 (unsigned long long)NFS_FILEID(inode), status);
1218 switch (status) {
1219 case -ETIMEDOUT:
1220 /* A soft timeout occurred. Use cached information? */
1221 if (server->flags & NFS_MOUNT_SOFTREVAL)
1222 status = 0;
1223 break;
1224 case -ESTALE:
1225 if (!S_ISDIR(inode->i_mode))
1226 nfs_set_inode_stale(inode);
1227 else
1228 nfs_zap_caches(inode);
1229 }
1230 goto err_out;
1231 }
1232
1233 status = nfs_refresh_inode(inode, fattr);
1234 if (status) {
1235 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1236 inode->i_sb->s_id,
1237 (unsigned long long)NFS_FILEID(inode), status);
1238 goto err_out;
1239 }
1240
1241 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1242 nfs_zap_acl_cache(inode);
1243
1244 nfs_setsecurity(inode, fattr, label);
1245
1246 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1247 inode->i_sb->s_id,
1248 (unsigned long long)NFS_FILEID(inode));
1249
1250err_out:
1251 nfs4_label_free(label);
1252out:
1253 nfs_free_fattr(fattr);
1254 trace_nfs_revalidate_inode_exit(inode, status);
1255 return status;
1256}
1257
1258int nfs_attribute_cache_expired(struct inode *inode)
1259{
1260 if (nfs_have_delegated_attributes(inode))
1261 return 0;
1262 return nfs_attribute_timeout(inode);
1263}
1264
1265/**
1266 * nfs_revalidate_inode - Revalidate the inode attributes
1267 * @inode: pointer to inode struct
1268 * @flags: cache flags to check
1269 *
1270 * Updates inode attribute information by retrieving the data from the server.
1271 */
1272int nfs_revalidate_inode(struct inode *inode, unsigned long flags)
1273{
1274 if (!nfs_check_cache_invalid(inode, flags))
1275 return NFS_STALE(inode) ? -ESTALE : 0;
1276 return __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1277}
1278EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1279
1280static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1281{
1282 int ret;
1283
1284 if (mapping->nrpages != 0) {
1285 if (S_ISREG(inode->i_mode)) {
1286 ret = nfs_sync_mapping(mapping);
1287 if (ret < 0)
1288 return ret;
1289 }
1290 ret = invalidate_inode_pages2(mapping);
1291 if (ret < 0)
1292 return ret;
1293 }
1294 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1295 nfs_fscache_wait_on_invalidate(inode);
1296
1297 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1298 inode->i_sb->s_id,
1299 (unsigned long long)NFS_FILEID(inode));
1300 return 0;
1301}
1302
1303/**
1304 * nfs_clear_invalid_mapping - Conditionally clear a mapping
1305 * @mapping: pointer to mapping
1306 *
1307 * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping.
1308 */
1309int nfs_clear_invalid_mapping(struct address_space *mapping)
1310{
1311 struct inode *inode = mapping->host;
1312 struct nfs_inode *nfsi = NFS_I(inode);
1313 unsigned long *bitlock = &nfsi->flags;
1314 int ret = 0;
1315
1316 /*
1317 * We must clear NFS_INO_INVALID_DATA first to ensure that
1318 * invalidations that come in while we're shooting down the mappings
1319 * are respected. But, that leaves a race window where one revalidator
1320 * can clear the flag, and then another checks it before the mapping
1321 * gets invalidated. Fix that by serializing access to this part of
1322 * the function.
1323 *
1324 * At the same time, we need to allow other tasks to see whether we
1325 * might be in the middle of invalidating the pages, so we only set
1326 * the bit lock here if it looks like we're going to be doing that.
1327 */
1328 for (;;) {
1329 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1330 nfs_wait_bit_killable, TASK_KILLABLE);
1331 if (ret)
1332 goto out;
1333 spin_lock(&inode->i_lock);
1334 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1335 spin_unlock(&inode->i_lock);
1336 continue;
1337 }
1338 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1339 break;
1340 spin_unlock(&inode->i_lock);
1341 goto out;
1342 }
1343
1344 set_bit(NFS_INO_INVALIDATING, bitlock);
1345 smp_wmb();
1346 nfsi->cache_validity &=
1347 ~(NFS_INO_INVALID_DATA | NFS_INO_DATA_INVAL_DEFER);
1348 spin_unlock(&inode->i_lock);
1349 trace_nfs_invalidate_mapping_enter(inode);
1350 ret = nfs_invalidate_mapping(inode, mapping);
1351 trace_nfs_invalidate_mapping_exit(inode, ret);
1352
1353 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1354 smp_mb__after_atomic();
1355 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1356out:
1357 return ret;
1358}
1359
1360bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1361{
1362 return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) ||
1363 NFS_STALE(inode);
1364}
1365
1366int nfs_revalidate_mapping_rcu(struct inode *inode)
1367{
1368 struct nfs_inode *nfsi = NFS_I(inode);
1369 unsigned long *bitlock = &nfsi->flags;
1370 int ret = 0;
1371
1372 if (IS_SWAPFILE(inode))
1373 goto out;
1374 if (nfs_mapping_need_revalidate_inode(inode)) {
1375 ret = -ECHILD;
1376 goto out;
1377 }
1378 spin_lock(&inode->i_lock);
1379 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1380 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1381 ret = -ECHILD;
1382 spin_unlock(&inode->i_lock);
1383out:
1384 return ret;
1385}
1386
1387/**
1388 * nfs_revalidate_mapping - Revalidate the pagecache
1389 * @inode: pointer to host inode
1390 * @mapping: pointer to mapping
1391 */
1392int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1393{
1394 /* swapfiles are not supposed to be shared. */
1395 if (IS_SWAPFILE(inode))
1396 return 0;
1397
1398 if (nfs_mapping_need_revalidate_inode(inode)) {
1399 int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1400 if (ret < 0)
1401 return ret;
1402 }
1403
1404 return nfs_clear_invalid_mapping(mapping);
1405}
1406
1407static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1408{
1409 struct inode *inode = &nfsi->vfs_inode;
1410
1411 if (!S_ISREG(inode->i_mode))
1412 return false;
1413 if (list_empty(&nfsi->open_files))
1414 return false;
1415 return inode_is_open_for_write(inode);
1416}
1417
1418static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1419{
1420 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1421}
1422
1423static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1424{
1425 struct timespec64 ts;
1426
1427 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1428 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1429 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1430 inode_set_iversion_raw(inode, fattr->change_attr);
1431 if (S_ISDIR(inode->i_mode))
1432 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1433 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1434 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
1435 }
1436 /* If we have atomic WCC data, we may update some attributes */
1437 ts = inode->i_ctime;
1438 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1439 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1440 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1441 inode->i_ctime = fattr->ctime;
1442 }
1443
1444 ts = inode->i_mtime;
1445 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1446 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1447 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1448 inode->i_mtime = fattr->mtime;
1449 if (S_ISDIR(inode->i_mode))
1450 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1451 }
1452 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1453 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1454 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1455 && !nfs_have_writebacks(inode)) {
1456 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1457 }
1458}
1459
1460/**
1461 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1462 * @inode: pointer to inode
1463 * @fattr: updated attributes
1464 *
1465 * Verifies the attribute cache. If we have just changed the attributes,
1466 * so that fattr carries weak cache consistency data, then it may
1467 * also update the ctime/mtime/change_attribute.
1468 */
1469static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1470{
1471 struct nfs_inode *nfsi = NFS_I(inode);
1472 loff_t cur_size, new_isize;
1473 unsigned long invalid = 0;
1474 struct timespec64 ts;
1475
1476 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1477 return 0;
1478
1479 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1480 /* Only a mounted-on-fileid? Just exit */
1481 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1482 return 0;
1483 /* Has the inode gone and changed behind our back? */
1484 } else if (nfsi->fileid != fattr->fileid) {
1485 /* Is this perhaps the mounted-on fileid? */
1486 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1487 nfsi->fileid == fattr->mounted_on_fileid)
1488 return 0;
1489 return -ESTALE;
1490 }
1491 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode))
1492 return -ESTALE;
1493
1494
1495 if (!nfs_file_has_buffered_writers(nfsi)) {
1496 /* Verify a few of the more important attributes */
1497 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1498 invalid |= NFS_INO_INVALID_CHANGE;
1499
1500 ts = inode->i_mtime;
1501 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
1502 invalid |= NFS_INO_INVALID_MTIME;
1503
1504 ts = inode->i_ctime;
1505 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
1506 invalid |= NFS_INO_INVALID_CTIME;
1507
1508 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1509 cur_size = i_size_read(inode);
1510 new_isize = nfs_size_to_loff_t(fattr->size);
1511 if (cur_size != new_isize)
1512 invalid |= NFS_INO_INVALID_SIZE;
1513 }
1514 }
1515
1516 /* Have any file permissions changed? */
1517 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1518 invalid |= NFS_INO_INVALID_MODE;
1519 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1520 invalid |= NFS_INO_INVALID_OTHER;
1521 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1522 invalid |= NFS_INO_INVALID_OTHER;
1523
1524 /* Has the link count changed? */
1525 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1526 invalid |= NFS_INO_INVALID_NLINK;
1527
1528 ts = inode->i_atime;
1529 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
1530 invalid |= NFS_INO_INVALID_ATIME;
1531
1532 if (invalid != 0)
1533 nfs_set_cache_invalid(inode, invalid);
1534
1535 nfsi->read_cache_jiffies = fattr->time_start;
1536 return 0;
1537}
1538
1539static atomic_long_t nfs_attr_generation_counter;
1540
1541static unsigned long nfs_read_attr_generation_counter(void)
1542{
1543 return atomic_long_read(&nfs_attr_generation_counter);
1544}
1545
1546unsigned long nfs_inc_attr_generation_counter(void)
1547{
1548 return atomic_long_inc_return(&nfs_attr_generation_counter);
1549}
1550EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1551
1552void nfs_fattr_init(struct nfs_fattr *fattr)
1553{
1554 fattr->valid = 0;
1555 fattr->time_start = jiffies;
1556 fattr->gencount = nfs_inc_attr_generation_counter();
1557 fattr->owner_name = NULL;
1558 fattr->group_name = NULL;
1559}
1560EXPORT_SYMBOL_GPL(nfs_fattr_init);
1561
1562/**
1563 * nfs_fattr_set_barrier
1564 * @fattr: attributes
1565 *
1566 * Used to set a barrier after an attribute was updated. This
1567 * barrier ensures that older attributes from RPC calls that may
1568 * have raced with our update cannot clobber these new values.
1569 * Note that you are still responsible for ensuring that other
1570 * operations which change the attribute on the server do not
1571 * collide.
1572 */
1573void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1574{
1575 fattr->gencount = nfs_inc_attr_generation_counter();
1576}
1577
1578struct nfs_fattr *nfs_alloc_fattr(void)
1579{
1580 struct nfs_fattr *fattr;
1581
1582 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1583 if (fattr != NULL)
1584 nfs_fattr_init(fattr);
1585 return fattr;
1586}
1587EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1588
1589struct nfs_fh *nfs_alloc_fhandle(void)
1590{
1591 struct nfs_fh *fh;
1592
1593 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1594 if (fh != NULL)
1595 fh->size = 0;
1596 return fh;
1597}
1598EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1599
1600#ifdef NFS_DEBUG
1601/*
1602 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1603 * in the same way that wireshark does
1604 *
1605 * @fh: file handle
1606 *
1607 * For debugging only.
1608 */
1609u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1610{
1611 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1612 * not on the result */
1613 return nfs_fhandle_hash(fh);
1614}
1615EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1616
1617/*
1618 * _nfs_display_fhandle - display an NFS file handle on the console
1619 *
1620 * @fh: file handle to display
1621 * @caption: display caption
1622 *
1623 * For debugging only.
1624 */
1625void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1626{
1627 unsigned short i;
1628
1629 if (fh == NULL || fh->size == 0) {
1630 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1631 return;
1632 }
1633
1634 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1635 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1636 for (i = 0; i < fh->size; i += 16) {
1637 __be32 *pos = (__be32 *)&fh->data[i];
1638
1639 switch ((fh->size - i - 1) >> 2) {
1640 case 0:
1641 printk(KERN_DEFAULT " %08x\n",
1642 be32_to_cpup(pos));
1643 break;
1644 case 1:
1645 printk(KERN_DEFAULT " %08x %08x\n",
1646 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1647 break;
1648 case 2:
1649 printk(KERN_DEFAULT " %08x %08x %08x\n",
1650 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1651 be32_to_cpup(pos + 2));
1652 break;
1653 default:
1654 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1655 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1656 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1657 }
1658 }
1659}
1660EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1661#endif
1662
1663/**
1664 * nfs_inode_attrs_cmp_generic - compare attributes
1665 * @fattr: attributes
1666 * @inode: pointer to inode
1667 *
1668 * Attempt to divine whether or not an RPC call reply carrying stale
1669 * attributes got scheduled after another call carrying updated ones.
1670 * Note also the check for wraparound of 'attr_gencount'
1671 *
1672 * The function returns '1' if it thinks the attributes in @fattr are
1673 * more recent than the ones cached in @inode. Otherwise it returns
1674 * the value '0'.
1675 */
1676static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr,
1677 const struct inode *inode)
1678{
1679 unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1680
1681 return (long)(fattr->gencount - attr_gencount) > 0 ||
1682 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1683}
1684
1685/**
1686 * nfs_inode_attrs_cmp_monotonic - compare attributes
1687 * @fattr: attributes
1688 * @inode: pointer to inode
1689 *
1690 * Attempt to divine whether or not an RPC call reply carrying stale
1691 * attributes got scheduled after another call carrying updated ones.
1692 *
1693 * We assume that the server observes monotonic semantics for
1694 * the change attribute, so a larger value means that the attributes in
1695 * @fattr are more recent, in which case the function returns the
1696 * value '1'.
1697 * A return value of '0' indicates no measurable change
1698 * A return value of '-1' means that the attributes in @inode are
1699 * more recent.
1700 */
1701static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr,
1702 const struct inode *inode)
1703{
1704 s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode);
1705 if (diff > 0)
1706 return 1;
1707 return diff == 0 ? 0 : -1;
1708}
1709
1710/**
1711 * nfs_inode_attrs_cmp_strict_monotonic - compare attributes
1712 * @fattr: attributes
1713 * @inode: pointer to inode
1714 *
1715 * Attempt to divine whether or not an RPC call reply carrying stale
1716 * attributes got scheduled after another call carrying updated ones.
1717 *
1718 * We assume that the server observes strictly monotonic semantics for
1719 * the change attribute, so a larger value means that the attributes in
1720 * @fattr are more recent, in which case the function returns the
1721 * value '1'.
1722 * A return value of '-1' means that the attributes in @inode are
1723 * more recent or unchanged.
1724 */
1725static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr,
1726 const struct inode *inode)
1727{
1728 return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1;
1729}
1730
1731/**
1732 * nfs_inode_attrs_cmp - compare attributes
1733 * @fattr: attributes
1734 * @inode: pointer to inode
1735 *
1736 * This function returns '1' if it thinks the attributes in @fattr are
1737 * more recent than the ones cached in @inode. It returns '-1' if
1738 * the attributes in @inode are more recent than the ones in @fattr,
1739 * and it returns 0 if not sure.
1740 */
1741static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr,
1742 const struct inode *inode)
1743{
1744 if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0)
1745 return 1;
1746 switch (NFS_SERVER(inode)->change_attr_type) {
1747 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1748 break;
1749 case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
1750 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1751 break;
1752 return nfs_inode_attrs_cmp_monotonic(fattr, inode);
1753 default:
1754 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1755 break;
1756 return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode);
1757 }
1758 return 0;
1759}
1760
1761/**
1762 * nfs_inode_finish_partial_attr_update - complete a previous inode update
1763 * @fattr: attributes
1764 * @inode: pointer to inode
1765 *
1766 * Returns '1' if the last attribute update left the inode cached
1767 * attributes in a partially unrevalidated state, and @fattr
1768 * matches the change attribute of that partial update.
1769 * Otherwise returns '0'.
1770 */
1771static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr,
1772 const struct inode *inode)
1773{
1774 const unsigned long check_valid =
1775 NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME |
1776 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
1777 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER |
1778 NFS_INO_INVALID_NLINK;
1779 unsigned long cache_validity = NFS_I(inode)->cache_validity;
1780
1781 if (!(cache_validity & NFS_INO_INVALID_CHANGE) &&
1782 (cache_validity & check_valid) != 0 &&
1783 (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1784 nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0)
1785 return 1;
1786 return 0;
1787}
1788
1789static int nfs_refresh_inode_locked(struct inode *inode,
1790 struct nfs_fattr *fattr)
1791{
1792 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
1793 int ret = 0;
1794
1795 trace_nfs_refresh_inode_enter(inode);
1796
1797 if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode))
1798 ret = nfs_update_inode(inode, fattr);
1799 else if (attr_cmp == 0)
1800 ret = nfs_check_inode_attributes(inode, fattr);
1801
1802 trace_nfs_refresh_inode_exit(inode, ret);
1803 return ret;
1804}
1805
1806/**
1807 * nfs_refresh_inode - try to update the inode attribute cache
1808 * @inode: pointer to inode
1809 * @fattr: updated attributes
1810 *
1811 * Check that an RPC call that returned attributes has not overlapped with
1812 * other recent updates of the inode metadata, then decide whether it is
1813 * safe to do a full update of the inode attributes, or whether just to
1814 * call nfs_check_inode_attributes.
1815 */
1816int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1817{
1818 int status;
1819
1820 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1821 return 0;
1822 spin_lock(&inode->i_lock);
1823 status = nfs_refresh_inode_locked(inode, fattr);
1824 spin_unlock(&inode->i_lock);
1825
1826 return status;
1827}
1828EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1829
1830static int nfs_post_op_update_inode_locked(struct inode *inode,
1831 struct nfs_fattr *fattr, unsigned int invalid)
1832{
1833 if (S_ISDIR(inode->i_mode))
1834 invalid |= NFS_INO_INVALID_DATA;
1835 nfs_set_cache_invalid(inode, invalid);
1836 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1837 return 0;
1838 return nfs_refresh_inode_locked(inode, fattr);
1839}
1840
1841/**
1842 * nfs_post_op_update_inode - try to update the inode attribute cache
1843 * @inode: pointer to inode
1844 * @fattr: updated attributes
1845 *
1846 * After an operation that has changed the inode metadata, mark the
1847 * attribute cache as being invalid, then try to update it.
1848 *
1849 * NB: if the server didn't return any post op attributes, this
1850 * function will force the retrieval of attributes before the next
1851 * NFS request. Thus it should be used only for operations that
1852 * are expected to change one or more attributes, to avoid
1853 * unnecessary NFS requests and trips through nfs_update_inode().
1854 */
1855int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1856{
1857 int status;
1858
1859 spin_lock(&inode->i_lock);
1860 nfs_fattr_set_barrier(fattr);
1861 status = nfs_post_op_update_inode_locked(inode, fattr,
1862 NFS_INO_INVALID_CHANGE
1863 | NFS_INO_INVALID_CTIME
1864 | NFS_INO_REVAL_FORCED);
1865 spin_unlock(&inode->i_lock);
1866
1867 return status;
1868}
1869EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1870
1871/**
1872 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1873 * @inode: pointer to inode
1874 * @fattr: updated attributes
1875 *
1876 * After an operation that has changed the inode metadata, mark the
1877 * attribute cache as being invalid, then try to update it. Fake up
1878 * weak cache consistency data, if none exist.
1879 *
1880 * This function is mainly designed to be used by the ->write_done() functions.
1881 */
1882int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1883{
1884 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
1885 int status;
1886
1887 /* Don't do a WCC update if these attributes are already stale */
1888 if (attr_cmp < 0)
1889 return 0;
1890 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) {
1891 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1892 | NFS_ATTR_FATTR_PRESIZE
1893 | NFS_ATTR_FATTR_PREMTIME
1894 | NFS_ATTR_FATTR_PRECTIME);
1895 goto out_noforce;
1896 }
1897 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1898 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1899 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1900 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1901 }
1902 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1903 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1904 fattr->pre_ctime = inode->i_ctime;
1905 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1906 }
1907 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1908 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1909 fattr->pre_mtime = inode->i_mtime;
1910 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1911 }
1912 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1913 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1914 fattr->pre_size = i_size_read(inode);
1915 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1916 }
1917out_noforce:
1918 status = nfs_post_op_update_inode_locked(inode, fattr,
1919 NFS_INO_INVALID_CHANGE
1920 | NFS_INO_INVALID_CTIME
1921 | NFS_INO_INVALID_MTIME
1922 | NFS_INO_INVALID_BLOCKS);
1923 return status;
1924}
1925
1926/**
1927 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1928 * @inode: pointer to inode
1929 * @fattr: updated attributes
1930 *
1931 * After an operation that has changed the inode metadata, mark the
1932 * attribute cache as being invalid, then try to update it. Fake up
1933 * weak cache consistency data, if none exist.
1934 *
1935 * This function is mainly designed to be used by the ->write_done() functions.
1936 */
1937int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1938{
1939 int status;
1940
1941 spin_lock(&inode->i_lock);
1942 nfs_fattr_set_barrier(fattr);
1943 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1944 spin_unlock(&inode->i_lock);
1945 return status;
1946}
1947EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1948
1949
1950/*
1951 * Many nfs protocol calls return the new file attributes after
1952 * an operation. Here we update the inode to reflect the state
1953 * of the server's inode.
1954 *
1955 * This is a bit tricky because we have to make sure all dirty pages
1956 * have been sent off to the server before calling invalidate_inode_pages.
1957 * To make sure no other process adds more write requests while we try
1958 * our best to flush them, we make them sleep during the attribute refresh.
1959 *
1960 * A very similar scenario holds for the dir cache.
1961 */
1962static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1963{
1964 struct nfs_server *server = NFS_SERVER(inode);
1965 struct nfs_inode *nfsi = NFS_I(inode);
1966 loff_t cur_isize, new_isize;
1967 u64 fattr_supported = server->fattr_valid;
1968 unsigned long invalid = 0;
1969 unsigned long now = jiffies;
1970 unsigned long save_cache_validity;
1971 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1972 bool cache_revalidated = true;
1973 bool attr_changed = false;
1974 bool have_delegation;
1975
1976 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1977 __func__, inode->i_sb->s_id, inode->i_ino,
1978 nfs_display_fhandle_hash(NFS_FH(inode)),
1979 atomic_read(&inode->i_count), fattr->valid);
1980
1981 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1982 /* Only a mounted-on-fileid? Just exit */
1983 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1984 return 0;
1985 /* Has the inode gone and changed behind our back? */
1986 } else if (nfsi->fileid != fattr->fileid) {
1987 /* Is this perhaps the mounted-on fileid? */
1988 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1989 nfsi->fileid == fattr->mounted_on_fileid)
1990 return 0;
1991 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1992 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1993 NFS_SERVER(inode)->nfs_client->cl_hostname,
1994 inode->i_sb->s_id, (long long)nfsi->fileid,
1995 (long long)fattr->fileid);
1996 goto out_err;
1997 }
1998
1999 /*
2000 * Make sure the inode's type hasn't changed.
2001 */
2002 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
2003 /*
2004 * Big trouble! The inode has become a different object.
2005 */
2006 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
2007 __func__, inode->i_ino, inode->i_mode, fattr->mode);
2008 goto out_err;
2009 }
2010
2011 /* Update the fsid? */
2012 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
2013 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
2014 !IS_AUTOMOUNT(inode))
2015 server->fsid = fattr->fsid;
2016
2017 /* Save the delegation state before clearing cache_validity */
2018 have_delegation = nfs_have_delegated_attributes(inode);
2019
2020 /*
2021 * Update the read time so we don't revalidate too often.
2022 */
2023 nfsi->read_cache_jiffies = fattr->time_start;
2024
2025 save_cache_validity = nfsi->cache_validity;
2026 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
2027 | NFS_INO_INVALID_ATIME
2028 | NFS_INO_REVAL_FORCED
2029 | NFS_INO_INVALID_BLOCKS);
2030
2031 /* Do atomic weak cache consistency updates */
2032 nfs_wcc_update_inode(inode, fattr);
2033
2034 if (pnfs_layoutcommit_outstanding(inode)) {
2035 nfsi->cache_validity |=
2036 save_cache_validity &
2037 (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
2038 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
2039 NFS_INO_INVALID_BLOCKS);
2040 cache_revalidated = false;
2041 }
2042
2043 /* More cache consistency checks */
2044 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
2045 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
2046 /* Could it be a race with writeback? */
2047 if (!(have_writers || have_delegation)) {
2048 invalid |= NFS_INO_INVALID_DATA
2049 | NFS_INO_INVALID_ACCESS
2050 | NFS_INO_INVALID_ACL
2051 | NFS_INO_INVALID_XATTR;
2052 /* Force revalidate of all attributes */
2053 save_cache_validity |= NFS_INO_INVALID_CTIME
2054 | NFS_INO_INVALID_MTIME
2055 | NFS_INO_INVALID_SIZE
2056 | NFS_INO_INVALID_BLOCKS
2057 | NFS_INO_INVALID_NLINK
2058 | NFS_INO_INVALID_MODE
2059 | NFS_INO_INVALID_OTHER;
2060 if (S_ISDIR(inode->i_mode))
2061 nfs_force_lookup_revalidate(inode);
2062 attr_changed = true;
2063 dprintk("NFS: change_attr change on server for file %s/%ld\n",
2064 inode->i_sb->s_id,
2065 inode->i_ino);
2066 } else if (!have_delegation)
2067 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
2068 inode_set_iversion_raw(inode, fattr->change_attr);
2069 }
2070 } else {
2071 nfsi->cache_validity |=
2072 save_cache_validity & NFS_INO_INVALID_CHANGE;
2073 if (!have_delegation ||
2074 (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0)
2075 cache_revalidated = false;
2076 }
2077
2078 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
2079 inode->i_mtime = fattr->mtime;
2080 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
2081 nfsi->cache_validity |=
2082 save_cache_validity & NFS_INO_INVALID_MTIME;
2083
2084 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
2085 inode->i_ctime = fattr->ctime;
2086 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
2087 nfsi->cache_validity |=
2088 save_cache_validity & NFS_INO_INVALID_CTIME;
2089
2090 /* Check if our cached file size is stale */
2091 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
2092 new_isize = nfs_size_to_loff_t(fattr->size);
2093 cur_isize = i_size_read(inode);
2094 if (new_isize != cur_isize && !have_delegation) {
2095 /* Do we perhaps have any outstanding writes, or has
2096 * the file grown beyond our last write? */
2097 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
2098 i_size_write(inode, new_isize);
2099 if (!have_writers)
2100 invalid |= NFS_INO_INVALID_DATA;
2101 }
2102 dprintk("NFS: isize change on server for file %s/%ld "
2103 "(%Ld to %Ld)\n",
2104 inode->i_sb->s_id,
2105 inode->i_ino,
2106 (long long)cur_isize,
2107 (long long)new_isize);
2108 }
2109 if (new_isize == 0 &&
2110 !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED |
2111 NFS_ATTR_FATTR_BLOCKS_USED))) {
2112 fattr->du.nfs3.used = 0;
2113 fattr->valid |= NFS_ATTR_FATTR_SPACE_USED;
2114 }
2115 } else
2116 nfsi->cache_validity |=
2117 save_cache_validity & NFS_INO_INVALID_SIZE;
2118
2119 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
2120 inode->i_atime = fattr->atime;
2121 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
2122 nfsi->cache_validity |=
2123 save_cache_validity & NFS_INO_INVALID_ATIME;
2124
2125 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2126 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
2127 umode_t newmode = inode->i_mode & S_IFMT;
2128 newmode |= fattr->mode & S_IALLUGO;
2129 inode->i_mode = newmode;
2130 invalid |= NFS_INO_INVALID_ACCESS
2131 | NFS_INO_INVALID_ACL;
2132 }
2133 } else if (fattr_supported & NFS_ATTR_FATTR_MODE)
2134 nfsi->cache_validity |=
2135 save_cache_validity & NFS_INO_INVALID_MODE;
2136
2137 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2138 if (!uid_eq(inode->i_uid, fattr->uid)) {
2139 invalid |= NFS_INO_INVALID_ACCESS
2140 | NFS_INO_INVALID_ACL;
2141 inode->i_uid = fattr->uid;
2142 }
2143 } else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
2144 nfsi->cache_validity |=
2145 save_cache_validity & NFS_INO_INVALID_OTHER;
2146
2147 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2148 if (!gid_eq(inode->i_gid, fattr->gid)) {
2149 invalid |= NFS_INO_INVALID_ACCESS
2150 | NFS_INO_INVALID_ACL;
2151 inode->i_gid = fattr->gid;
2152 }
2153 } else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
2154 nfsi->cache_validity |=
2155 save_cache_validity & NFS_INO_INVALID_OTHER;
2156
2157 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2158 if (inode->i_nlink != fattr->nlink) {
2159 if (S_ISDIR(inode->i_mode))
2160 invalid |= NFS_INO_INVALID_DATA;
2161 set_nlink(inode, fattr->nlink);
2162 }
2163 } else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
2164 nfsi->cache_validity |=
2165 save_cache_validity & NFS_INO_INVALID_NLINK;
2166
2167 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2168 /*
2169 * report the blocks in 512byte units
2170 */
2171 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2172 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED)
2173 nfsi->cache_validity |=
2174 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2175
2176 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2177 inode->i_blocks = fattr->du.nfs2.blocks;
2178 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED)
2179 nfsi->cache_validity |=
2180 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2181
2182 /* Update attrtimeo value if we're out of the unstable period */
2183 if (attr_changed) {
2184 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2185 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2186 nfsi->attrtimeo_timestamp = now;
2187 /* Set barrier to be more recent than all outstanding updates */
2188 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2189 } else {
2190 if (cache_revalidated) {
2191 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2192 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2193 nfsi->attrtimeo <<= 1;
2194 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2195 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2196 }
2197 nfsi->attrtimeo_timestamp = now;
2198 }
2199 /* Set the barrier to be more recent than this fattr */
2200 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
2201 nfsi->attr_gencount = fattr->gencount;
2202 }
2203
2204 /* Don't invalidate the data if we were to blame */
2205 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2206 || S_ISLNK(inode->i_mode)))
2207 invalid &= ~NFS_INO_INVALID_DATA;
2208 nfs_set_cache_invalid(inode, invalid);
2209
2210 return 0;
2211 out_err:
2212 /*
2213 * No need to worry about unhashing the dentry, as the
2214 * lookup validation will know that the inode is bad.
2215 * (But we fall through to invalidate the caches.)
2216 */
2217 nfs_set_inode_stale_locked(inode);
2218 return -ESTALE;
2219}
2220
2221struct inode *nfs_alloc_inode(struct super_block *sb)
2222{
2223 struct nfs_inode *nfsi;
2224 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
2225 if (!nfsi)
2226 return NULL;
2227 nfsi->flags = 0UL;
2228 nfsi->cache_validity = 0UL;
2229#if IS_ENABLED(CONFIG_NFS_V4)
2230 nfsi->nfs4_acl = NULL;
2231#endif /* CONFIG_NFS_V4 */
2232#ifdef CONFIG_NFS_V4_2
2233 nfsi->xattr_cache = NULL;
2234#endif
2235 return &nfsi->vfs_inode;
2236}
2237EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2238
2239void nfs_free_inode(struct inode *inode)
2240{
2241 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2242}
2243EXPORT_SYMBOL_GPL(nfs_free_inode);
2244
2245static inline void nfs4_init_once(struct nfs_inode *nfsi)
2246{
2247#if IS_ENABLED(CONFIG_NFS_V4)
2248 INIT_LIST_HEAD(&nfsi->open_states);
2249 nfsi->delegation = NULL;
2250 init_rwsem(&nfsi->rwsem);
2251 nfsi->layout = NULL;
2252#endif
2253}
2254
2255static void init_once(void *foo)
2256{
2257 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2258
2259 inode_init_once(&nfsi->vfs_inode);
2260 INIT_LIST_HEAD(&nfsi->open_files);
2261 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2262 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2263 INIT_LIST_HEAD(&nfsi->commit_info.list);
2264 atomic_long_set(&nfsi->nrequests, 0);
2265 atomic_long_set(&nfsi->commit_info.ncommit, 0);
2266 atomic_set(&nfsi->commit_info.rpcs_out, 0);
2267 init_rwsem(&nfsi->rmdir_sem);
2268 mutex_init(&nfsi->commit_mutex);
2269 nfs4_init_once(nfsi);
2270 nfsi->cache_change_attribute = 0;
2271}
2272
2273static int __init nfs_init_inodecache(void)
2274{
2275 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2276 sizeof(struct nfs_inode),
2277 0, (SLAB_RECLAIM_ACCOUNT|
2278 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2279 init_once);
2280 if (nfs_inode_cachep == NULL)
2281 return -ENOMEM;
2282
2283 return 0;
2284}
2285
2286static void nfs_destroy_inodecache(void)
2287{
2288 /*
2289 * Make sure all delayed rcu free inodes are flushed before we
2290 * destroy cache.
2291 */
2292 rcu_barrier();
2293 kmem_cache_destroy(nfs_inode_cachep);
2294}
2295
2296struct workqueue_struct *nfsiod_workqueue;
2297EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2298
2299/*
2300 * start up the nfsiod workqueue
2301 */
2302static int nfsiod_start(void)
2303{
2304 struct workqueue_struct *wq;
2305 dprintk("RPC: creating workqueue nfsiod\n");
2306 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2307 if (wq == NULL)
2308 return -ENOMEM;
2309 nfsiod_workqueue = wq;
2310 return 0;
2311}
2312
2313/*
2314 * Destroy the nfsiod workqueue
2315 */
2316static void nfsiod_stop(void)
2317{
2318 struct workqueue_struct *wq;
2319
2320 wq = nfsiod_workqueue;
2321 if (wq == NULL)
2322 return;
2323 nfsiod_workqueue = NULL;
2324 destroy_workqueue(wq);
2325}
2326
2327unsigned int nfs_net_id;
2328EXPORT_SYMBOL_GPL(nfs_net_id);
2329
2330static int nfs_net_init(struct net *net)
2331{
2332 nfs_clients_init(net);
2333 return nfs_fs_proc_net_init(net);
2334}
2335
2336static void nfs_net_exit(struct net *net)
2337{
2338 nfs_fs_proc_net_exit(net);
2339 nfs_clients_exit(net);
2340}
2341
2342static struct pernet_operations nfs_net_ops = {
2343 .init = nfs_net_init,
2344 .exit = nfs_net_exit,
2345 .id = &nfs_net_id,
2346 .size = sizeof(struct nfs_net),
2347};
2348
2349/*
2350 * Initialize NFS
2351 */
2352static int __init init_nfs_fs(void)
2353{
2354 int err;
2355
2356 err = nfs_sysfs_init();
2357 if (err < 0)
2358 goto out10;
2359
2360 err = register_pernet_subsys(&nfs_net_ops);
2361 if (err < 0)
2362 goto out9;
2363
2364 err = nfs_fscache_register();
2365 if (err < 0)
2366 goto out8;
2367
2368 err = nfsiod_start();
2369 if (err)
2370 goto out7;
2371
2372 err = nfs_fs_proc_init();
2373 if (err)
2374 goto out6;
2375
2376 err = nfs_init_nfspagecache();
2377 if (err)
2378 goto out5;
2379
2380 err = nfs_init_inodecache();
2381 if (err)
2382 goto out4;
2383
2384 err = nfs_init_readpagecache();
2385 if (err)
2386 goto out3;
2387
2388 err = nfs_init_writepagecache();
2389 if (err)
2390 goto out2;
2391
2392 err = nfs_init_directcache();
2393 if (err)
2394 goto out1;
2395
2396 rpc_proc_register(&init_net, &nfs_rpcstat);
2397
2398 err = register_nfs_fs();
2399 if (err)
2400 goto out0;
2401
2402 return 0;
2403out0:
2404 rpc_proc_unregister(&init_net, "nfs");
2405 nfs_destroy_directcache();
2406out1:
2407 nfs_destroy_writepagecache();
2408out2:
2409 nfs_destroy_readpagecache();
2410out3:
2411 nfs_destroy_inodecache();
2412out4:
2413 nfs_destroy_nfspagecache();
2414out5:
2415 nfs_fs_proc_exit();
2416out6:
2417 nfsiod_stop();
2418out7:
2419 nfs_fscache_unregister();
2420out8:
2421 unregister_pernet_subsys(&nfs_net_ops);
2422out9:
2423 nfs_sysfs_exit();
2424out10:
2425 return err;
2426}
2427
2428static void __exit exit_nfs_fs(void)
2429{
2430 nfs_destroy_directcache();
2431 nfs_destroy_writepagecache();
2432 nfs_destroy_readpagecache();
2433 nfs_destroy_inodecache();
2434 nfs_destroy_nfspagecache();
2435 nfs_fscache_unregister();
2436 unregister_pernet_subsys(&nfs_net_ops);
2437 rpc_proc_unregister(&init_net, "nfs");
2438 unregister_nfs_fs();
2439 nfs_fs_proc_exit();
2440 nfsiod_stop();
2441 nfs_sysfs_exit();
2442}
2443
2444/* Not quite true; I just maintain it */
2445MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2446MODULE_LICENSE("GPL");
2447module_param(enable_ino64, bool, 0644);
2448
2449module_init(init_nfs_fs)
2450module_exit(exit_nfs_fs)
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 */
63static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
64
65static void nfs_invalidate_inode(struct inode *);
66static int nfs_update_inode(struct inode *, struct nfs_fattr *);
67
68static struct kmem_cache * nfs_inode_cachep;
69
70static inline unsigned long
71nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
72{
73 return nfs_fileid_to_ino_t(fattr->fileid);
74}
75
76static int nfs_wait_killable(int mode)
77{
78 freezable_schedule_unsafe();
79 if (signal_pending_state(mode, current))
80 return -ERESTARTSYS;
81 return 0;
82}
83
84int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
85{
86 return nfs_wait_killable(mode);
87}
88EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
89
90/**
91 * nfs_compat_user_ino64 - returns the user-visible inode number
92 * @fileid: 64-bit fileid
93 *
94 * This function returns a 32-bit inode number if the boot parameter
95 * nfs.enable_ino64 is zero.
96 */
97u64 nfs_compat_user_ino64(u64 fileid)
98{
99#ifdef CONFIG_COMPAT
100 compat_ulong_t ino;
101#else
102 unsigned long ino;
103#endif
104
105 if (enable_ino64)
106 return fileid;
107 ino = fileid;
108 if (sizeof(ino) < sizeof(fileid))
109 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
110 return ino;
111}
112
113int nfs_drop_inode(struct inode *inode)
114{
115 return NFS_STALE(inode) || generic_drop_inode(inode);
116}
117EXPORT_SYMBOL_GPL(nfs_drop_inode);
118
119void nfs_clear_inode(struct inode *inode)
120{
121 /*
122 * The following should never happen...
123 */
124 WARN_ON_ONCE(nfs_have_writebacks(inode));
125 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
126 nfs_zap_acl_cache(inode);
127 nfs_access_zap_cache(inode);
128 nfs_fscache_clear_inode(inode);
129}
130EXPORT_SYMBOL_GPL(nfs_clear_inode);
131
132void nfs_evict_inode(struct inode *inode)
133{
134 truncate_inode_pages_final(&inode->i_data);
135 clear_inode(inode);
136 nfs_clear_inode(inode);
137}
138
139int nfs_sync_inode(struct inode *inode)
140{
141 inode_dio_wait(inode);
142 return nfs_wb_all(inode);
143}
144EXPORT_SYMBOL_GPL(nfs_sync_inode);
145
146/**
147 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
148 * @mapping: pointer to struct address_space
149 */
150int nfs_sync_mapping(struct address_space *mapping)
151{
152 int ret = 0;
153
154 if (mapping->nrpages != 0) {
155 unmap_mapping_range(mapping, 0, 0, 0);
156 ret = nfs_wb_all(mapping->host);
157 }
158 return ret;
159}
160
161static int nfs_attribute_timeout(struct inode *inode)
162{
163 struct nfs_inode *nfsi = NFS_I(inode);
164
165 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
166}
167
168static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
169{
170 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
171
172 /* Special case for the pagecache or access cache */
173 if (flags == NFS_INO_REVAL_PAGECACHE &&
174 !(cache_validity & NFS_INO_REVAL_FORCED))
175 return false;
176 return (cache_validity & flags) != 0;
177}
178
179static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
180{
181 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
182
183 if ((cache_validity & flags) != 0)
184 return true;
185 if (nfs_attribute_timeout(inode))
186 return true;
187 return false;
188}
189
190bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
191{
192 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
193 return nfs_check_cache_invalid_delegated(inode, flags);
194
195 return nfs_check_cache_invalid_not_delegated(inode, flags);
196}
197
198static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
199{
200 struct nfs_inode *nfsi = NFS_I(inode);
201 bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
202
203 if (have_delegation) {
204 if (!(flags & NFS_INO_REVAL_FORCED))
205 flags &= ~NFS_INO_INVALID_OTHER;
206 flags &= ~(NFS_INO_INVALID_CHANGE
207 | NFS_INO_INVALID_SIZE
208 | NFS_INO_REVAL_PAGECACHE);
209 }
210
211 if (inode->i_mapping->nrpages == 0)
212 flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER);
213 nfsi->cache_validity |= flags;
214 if (flags & NFS_INO_INVALID_DATA)
215 nfs_fscache_invalidate(inode);
216}
217
218/*
219 * Invalidate the local caches
220 */
221static void nfs_zap_caches_locked(struct inode *inode)
222{
223 struct nfs_inode *nfsi = NFS_I(inode);
224 int mode = inode->i_mode;
225
226 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
227
228 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
229 nfsi->attrtimeo_timestamp = jiffies;
230
231 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
232 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
233 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
234 | NFS_INO_INVALID_DATA
235 | NFS_INO_INVALID_ACCESS
236 | NFS_INO_INVALID_ACL
237 | NFS_INO_REVAL_PAGECACHE);
238 } else
239 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
240 | NFS_INO_INVALID_ACCESS
241 | NFS_INO_INVALID_ACL
242 | NFS_INO_REVAL_PAGECACHE);
243 nfs_zap_label_cache_locked(nfsi);
244}
245
246void nfs_zap_caches(struct inode *inode)
247{
248 spin_lock(&inode->i_lock);
249 nfs_zap_caches_locked(inode);
250 spin_unlock(&inode->i_lock);
251}
252
253void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
254{
255 if (mapping->nrpages != 0) {
256 spin_lock(&inode->i_lock);
257 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
258 spin_unlock(&inode->i_lock);
259 }
260}
261
262void nfs_zap_acl_cache(struct inode *inode)
263{
264 void (*clear_acl_cache)(struct inode *);
265
266 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
267 if (clear_acl_cache != NULL)
268 clear_acl_cache(inode);
269 spin_lock(&inode->i_lock);
270 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
271 spin_unlock(&inode->i_lock);
272}
273EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
274
275void nfs_invalidate_atime(struct inode *inode)
276{
277 spin_lock(&inode->i_lock);
278 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
279 spin_unlock(&inode->i_lock);
280}
281EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
282
283/*
284 * Invalidate, but do not unhash, the inode.
285 * NB: must be called with inode->i_lock held!
286 */
287static void nfs_invalidate_inode(struct inode *inode)
288{
289 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
290 nfs_zap_caches_locked(inode);
291}
292
293struct nfs_find_desc {
294 struct nfs_fh *fh;
295 struct nfs_fattr *fattr;
296};
297
298/*
299 * In NFSv3 we can have 64bit inode numbers. In order to support
300 * this, and re-exported directories (also seen in NFSv2)
301 * we are forced to allow 2 different inodes to have the same
302 * i_ino.
303 */
304static int
305nfs_find_actor(struct inode *inode, void *opaque)
306{
307 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
308 struct nfs_fh *fh = desc->fh;
309 struct nfs_fattr *fattr = desc->fattr;
310
311 if (NFS_FILEID(inode) != fattr->fileid)
312 return 0;
313 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
314 return 0;
315 if (nfs_compare_fh(NFS_FH(inode), fh))
316 return 0;
317 if (is_bad_inode(inode) || NFS_STALE(inode))
318 return 0;
319 return 1;
320}
321
322static int
323nfs_init_locked(struct inode *inode, void *opaque)
324{
325 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
326 struct nfs_fattr *fattr = desc->fattr;
327
328 set_nfs_fileid(inode, fattr->fileid);
329 inode->i_mode = fattr->mode;
330 nfs_copy_fh(NFS_FH(inode), desc->fh);
331 return 0;
332}
333
334#ifdef CONFIG_NFS_V4_SECURITY_LABEL
335static void nfs_clear_label_invalid(struct inode *inode)
336{
337 spin_lock(&inode->i_lock);
338 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
339 spin_unlock(&inode->i_lock);
340}
341
342void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
343 struct nfs4_label *label)
344{
345 int error;
346
347 if (label == NULL)
348 return;
349
350 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
351 error = security_inode_notifysecctx(inode, label->label,
352 label->len);
353 if (error)
354 printk(KERN_ERR "%s() %s %d "
355 "security_inode_notifysecctx() %d\n",
356 __func__,
357 (char *)label->label,
358 label->len, error);
359 nfs_clear_label_invalid(inode);
360 }
361}
362
363struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
364{
365 struct nfs4_label *label = NULL;
366 int minor_version = server->nfs_client->cl_minorversion;
367
368 if (minor_version < 2)
369 return label;
370
371 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
372 return label;
373
374 label = kzalloc(sizeof(struct nfs4_label), flags);
375 if (label == NULL)
376 return ERR_PTR(-ENOMEM);
377
378 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
379 if (label->label == NULL) {
380 kfree(label);
381 return ERR_PTR(-ENOMEM);
382 }
383 label->len = NFS4_MAXLABELLEN;
384
385 return label;
386}
387EXPORT_SYMBOL_GPL(nfs4_label_alloc);
388#else
389void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
390 struct nfs4_label *label)
391{
392}
393#endif
394EXPORT_SYMBOL_GPL(nfs_setsecurity);
395
396/* Search for inode identified by fh, fileid and i_mode in inode cache. */
397struct inode *
398nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
399{
400 struct nfs_find_desc desc = {
401 .fh = fh,
402 .fattr = fattr,
403 };
404 struct inode *inode;
405 unsigned long hash;
406
407 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
408 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
409 return NULL;
410
411 hash = nfs_fattr_to_ino_t(fattr);
412 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
413
414 dprintk("%s: returning %p\n", __func__, inode);
415 return inode;
416}
417
418/*
419 * This is our front-end to iget that looks up inodes by file handle
420 * instead of inode number.
421 */
422struct inode *
423nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
424{
425 struct nfs_find_desc desc = {
426 .fh = fh,
427 .fattr = fattr
428 };
429 struct inode *inode = ERR_PTR(-ENOENT);
430 unsigned long hash;
431
432 nfs_attr_check_mountpoint(sb, fattr);
433
434 if (nfs_attr_use_mounted_on_fileid(fattr))
435 fattr->fileid = fattr->mounted_on_fileid;
436 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
437 goto out_no_inode;
438 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
439 goto out_no_inode;
440
441 hash = nfs_fattr_to_ino_t(fattr);
442
443 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
444 if (inode == NULL) {
445 inode = ERR_PTR(-ENOMEM);
446 goto out_no_inode;
447 }
448
449 if (inode->i_state & I_NEW) {
450 struct nfs_inode *nfsi = NFS_I(inode);
451 unsigned long now = jiffies;
452
453 /* We set i_ino for the few things that still rely on it,
454 * such as stat(2) */
455 inode->i_ino = hash;
456
457 /* We can't support update_atime(), since the server will reset it */
458 inode->i_flags |= S_NOATIME|S_NOCMTIME;
459 inode->i_mode = fattr->mode;
460 nfsi->cache_validity = 0;
461 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
462 && nfs_server_capable(inode, NFS_CAP_MODE))
463 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
464 /* Why so? Because we want revalidate for devices/FIFOs, and
465 * that's precisely what we have in nfs_file_inode_operations.
466 */
467 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
468 if (S_ISREG(inode->i_mode)) {
469 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
470 inode->i_data.a_ops = &nfs_file_aops;
471 } else if (S_ISDIR(inode->i_mode)) {
472 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
473 inode->i_fop = &nfs_dir_operations;
474 inode->i_data.a_ops = &nfs_dir_aops;
475 /* Deal with crossing mountpoints */
476 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
477 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
478 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
479 inode->i_op = &nfs_referral_inode_operations;
480 else
481 inode->i_op = &nfs_mountpoint_inode_operations;
482 inode->i_fop = NULL;
483 inode->i_flags |= S_AUTOMOUNT;
484 }
485 } else if (S_ISLNK(inode->i_mode)) {
486 inode->i_op = &nfs_symlink_inode_operations;
487 inode_nohighmem(inode);
488 } else
489 init_special_inode(inode, inode->i_mode, fattr->rdev);
490
491 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
492 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
493 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
494 inode_set_iversion_raw(inode, 0);
495 inode->i_size = 0;
496 clear_nlink(inode);
497 inode->i_uid = make_kuid(&init_user_ns, -2);
498 inode->i_gid = make_kgid(&init_user_ns, -2);
499 inode->i_blocks = 0;
500 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
501 nfsi->write_io = 0;
502 nfsi->read_io = 0;
503
504 nfsi->read_cache_jiffies = fattr->time_start;
505 nfsi->attr_gencount = fattr->gencount;
506 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
507 inode->i_atime = timespec_to_timespec64(fattr->atime);
508 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
509 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
510 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
511 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
512 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
513 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
514 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
515 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
516 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
517 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
518 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
519 inode_set_iversion_raw(inode, fattr->change_attr);
520 else
521 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
522 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
523 inode->i_size = nfs_size_to_loff_t(fattr->size);
524 else
525 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
526 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
527 set_nlink(inode, fattr->nlink);
528 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
529 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
530 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
531 inode->i_uid = fattr->uid;
532 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
533 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
534 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
535 inode->i_gid = fattr->gid;
536 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
537 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
538 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
539 inode->i_blocks = fattr->du.nfs2.blocks;
540 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
541 /*
542 * report the blocks in 512byte units
543 */
544 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
545 }
546
547 if (nfsi->cache_validity != 0)
548 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
549
550 nfs_setsecurity(inode, fattr, label);
551
552 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
553 nfsi->attrtimeo_timestamp = now;
554 nfsi->access_cache = RB_ROOT;
555
556 nfs_fscache_init_inode(inode);
557
558 unlock_new_inode(inode);
559 } else {
560 int err = nfs_refresh_inode(inode, fattr);
561 if (err < 0) {
562 iput(inode);
563 inode = ERR_PTR(err);
564 goto out_no_inode;
565 }
566 }
567 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
568 inode->i_sb->s_id,
569 (unsigned long long)NFS_FILEID(inode),
570 nfs_display_fhandle_hash(fh),
571 atomic_read(&inode->i_count));
572
573out:
574 return inode;
575
576out_no_inode:
577 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
578 goto out;
579}
580EXPORT_SYMBOL_GPL(nfs_fhget);
581
582#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)
583
584int
585nfs_setattr(struct dentry *dentry, struct iattr *attr)
586{
587 struct inode *inode = d_inode(dentry);
588 struct nfs_fattr *fattr;
589 int error = 0;
590
591 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
592
593 /* skip mode change if it's just for clearing setuid/setgid */
594 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
595 attr->ia_valid &= ~ATTR_MODE;
596
597 if (attr->ia_valid & ATTR_SIZE) {
598 BUG_ON(!S_ISREG(inode->i_mode));
599
600 error = inode_newsize_ok(inode, attr->ia_size);
601 if (error)
602 return error;
603
604 if (attr->ia_size == i_size_read(inode))
605 attr->ia_valid &= ~ATTR_SIZE;
606 }
607
608 /* Optimization: if the end result is no change, don't RPC */
609 attr->ia_valid &= NFS_VALID_ATTRS;
610 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
611 return 0;
612
613 trace_nfs_setattr_enter(inode);
614
615 /* Write all dirty data */
616 if (S_ISREG(inode->i_mode))
617 nfs_sync_inode(inode);
618
619 fattr = nfs_alloc_fattr();
620 if (fattr == NULL) {
621 error = -ENOMEM;
622 goto out;
623 }
624
625 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
626 if (error == 0)
627 error = nfs_refresh_inode(inode, fattr);
628 nfs_free_fattr(fattr);
629out:
630 trace_nfs_setattr_exit(inode, error);
631 return error;
632}
633EXPORT_SYMBOL_GPL(nfs_setattr);
634
635/**
636 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
637 * @inode: inode of the file used
638 * @offset: file offset to start truncating
639 *
640 * This is a copy of the common vmtruncate, but with the locking
641 * corrected to take into account the fact that NFS requires
642 * inode->i_size to be updated under the inode->i_lock.
643 * Note: must be called with inode->i_lock held!
644 */
645static int nfs_vmtruncate(struct inode * inode, loff_t offset)
646{
647 int err;
648
649 err = inode_newsize_ok(inode, offset);
650 if (err)
651 goto out;
652
653 i_size_write(inode, offset);
654 /* Optimisation */
655 if (offset == 0)
656 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA |
657 NFS_INO_DATA_INVAL_DEFER);
658 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
659
660 spin_unlock(&inode->i_lock);
661 truncate_pagecache(inode, offset);
662 spin_lock(&inode->i_lock);
663out:
664 return err;
665}
666
667/**
668 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
669 * @inode: pointer to struct inode
670 * @attr: pointer to struct iattr
671 * @fattr: pointer to struct nfs_fattr
672 *
673 * Note: we do this in the *proc.c in order to ensure that
674 * it works for things like exclusive creates too.
675 */
676void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
677 struct nfs_fattr *fattr)
678{
679 /* Barrier: bump the attribute generation count. */
680 nfs_fattr_set_barrier(fattr);
681
682 spin_lock(&inode->i_lock);
683 NFS_I(inode)->attr_gencount = fattr->gencount;
684 if ((attr->ia_valid & ATTR_SIZE) != 0) {
685 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
686 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
687 nfs_vmtruncate(inode, attr->ia_size);
688 }
689 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
690 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
691 if ((attr->ia_valid & ATTR_MODE) != 0) {
692 int mode = attr->ia_mode & S_IALLUGO;
693 mode |= inode->i_mode & ~S_IALLUGO;
694 inode->i_mode = mode;
695 }
696 if ((attr->ia_valid & ATTR_UID) != 0)
697 inode->i_uid = attr->ia_uid;
698 if ((attr->ia_valid & ATTR_GID) != 0)
699 inode->i_gid = attr->ia_gid;
700 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
701 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
702 else
703 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
704 | NFS_INO_INVALID_CTIME);
705 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
706 | NFS_INO_INVALID_ACL);
707 }
708 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
709 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
710 | NFS_INO_INVALID_CTIME);
711 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
712 inode->i_atime = timespec_to_timespec64(fattr->atime);
713 else if (attr->ia_valid & ATTR_ATIME_SET)
714 inode->i_atime = attr->ia_atime;
715 else
716 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
717
718 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
719 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
720 else
721 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
722 | NFS_INO_INVALID_CTIME);
723 }
724 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
725 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
726 | NFS_INO_INVALID_CTIME);
727 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
728 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
729 else if (attr->ia_valid & ATTR_MTIME_SET)
730 inode->i_mtime = attr->ia_mtime;
731 else
732 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
733
734 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
735 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
736 else
737 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
738 | NFS_INO_INVALID_CTIME);
739 }
740 if (fattr->valid)
741 nfs_update_inode(inode, fattr);
742 spin_unlock(&inode->i_lock);
743}
744EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
745
746static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
747{
748 struct dentry *parent;
749
750 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
751 return;
752 parent = dget_parent(dentry);
753 nfs_force_use_readdirplus(d_inode(parent));
754 dput(parent);
755}
756
757static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
758{
759 struct dentry *parent;
760
761 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
762 return;
763 parent = dget_parent(dentry);
764 nfs_advise_use_readdirplus(d_inode(parent));
765 dput(parent);
766}
767
768static bool nfs_need_revalidate_inode(struct inode *inode)
769{
770 if (NFS_I(inode)->cache_validity &
771 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
772 return true;
773 if (nfs_attribute_cache_expired(inode))
774 return true;
775 return false;
776}
777
778int nfs_getattr(const struct path *path, struct kstat *stat,
779 u32 request_mask, unsigned int query_flags)
780{
781 struct inode *inode = d_inode(path->dentry);
782 struct nfs_server *server = NFS_SERVER(inode);
783 unsigned long cache_validity;
784 int err = 0;
785 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
786 bool do_update = false;
787
788 trace_nfs_getattr_enter(inode);
789
790 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync)
791 goto out_no_update;
792
793 /* Flush out writes to the server in order to update c/mtime. */
794 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
795 S_ISREG(inode->i_mode)) {
796 err = filemap_write_and_wait(inode->i_mapping);
797 if (err)
798 goto out;
799 }
800
801 /*
802 * We may force a getattr if the user cares about atime.
803 *
804 * Note that we only have to check the vfsmount flags here:
805 * - NFS always sets S_NOATIME by so checking it would give a
806 * bogus result
807 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
808 * no point in checking those.
809 */
810 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
811 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
812 request_mask &= ~STATX_ATIME;
813
814 /* Is the user requesting attributes that might need revalidation? */
815 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
816 STATX_MTIME|STATX_UID|STATX_GID|
817 STATX_SIZE|STATX_BLOCKS)))
818 goto out_no_revalidate;
819
820 /* Check whether the cached attributes are stale */
821 do_update |= force_sync || nfs_attribute_cache_expired(inode);
822 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
823 do_update |= cache_validity &
824 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
825 if (request_mask & STATX_ATIME)
826 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
827 if (request_mask & (STATX_CTIME|STATX_MTIME))
828 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
829 if (do_update) {
830 /* Update the attribute cache */
831 if (!(server->flags & NFS_MOUNT_NOAC))
832 nfs_readdirplus_parent_cache_miss(path->dentry);
833 else
834 nfs_readdirplus_parent_cache_hit(path->dentry);
835 err = __nfs_revalidate_inode(server, inode);
836 if (err)
837 goto out;
838 } else
839 nfs_readdirplus_parent_cache_hit(path->dentry);
840out_no_revalidate:
841 /* Only return attributes that were revalidated. */
842 stat->result_mask &= request_mask;
843out_no_update:
844 generic_fillattr(inode, stat);
845 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
846 if (S_ISDIR(inode->i_mode))
847 stat->blksize = NFS_SERVER(inode)->dtsize;
848out:
849 trace_nfs_getattr_exit(inode, err);
850 return err;
851}
852EXPORT_SYMBOL_GPL(nfs_getattr);
853
854static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
855{
856 refcount_set(&l_ctx->count, 1);
857 l_ctx->lockowner = current->files;
858 INIT_LIST_HEAD(&l_ctx->list);
859 atomic_set(&l_ctx->io_count, 0);
860}
861
862static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
863{
864 struct nfs_lock_context *pos;
865
866 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
867 if (pos->lockowner != current->files)
868 continue;
869 if (refcount_inc_not_zero(&pos->count))
870 return pos;
871 }
872 return NULL;
873}
874
875struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
876{
877 struct nfs_lock_context *res, *new = NULL;
878 struct inode *inode = d_inode(ctx->dentry);
879
880 rcu_read_lock();
881 res = __nfs_find_lock_context(ctx);
882 rcu_read_unlock();
883 if (res == NULL) {
884 new = kmalloc(sizeof(*new), GFP_KERNEL);
885 if (new == NULL)
886 return ERR_PTR(-ENOMEM);
887 nfs_init_lock_context(new);
888 spin_lock(&inode->i_lock);
889 res = __nfs_find_lock_context(ctx);
890 if (res == NULL) {
891 new->open_context = get_nfs_open_context(ctx);
892 if (new->open_context) {
893 list_add_tail_rcu(&new->list,
894 &ctx->lock_context.list);
895 res = new;
896 new = NULL;
897 } else
898 res = ERR_PTR(-EBADF);
899 }
900 spin_unlock(&inode->i_lock);
901 kfree(new);
902 }
903 return res;
904}
905EXPORT_SYMBOL_GPL(nfs_get_lock_context);
906
907void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
908{
909 struct nfs_open_context *ctx = l_ctx->open_context;
910 struct inode *inode = d_inode(ctx->dentry);
911
912 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
913 return;
914 list_del_rcu(&l_ctx->list);
915 spin_unlock(&inode->i_lock);
916 put_nfs_open_context(ctx);
917 kfree_rcu(l_ctx, rcu_head);
918}
919EXPORT_SYMBOL_GPL(nfs_put_lock_context);
920
921/**
922 * nfs_close_context - Common close_context() routine NFSv2/v3
923 * @ctx: pointer to context
924 * @is_sync: is this a synchronous close
925 *
926 * Ensure that the attributes are up to date if we're mounted
927 * with close-to-open semantics and we have cached data that will
928 * need to be revalidated on open.
929 */
930void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
931{
932 struct nfs_inode *nfsi;
933 struct inode *inode;
934 struct nfs_server *server;
935
936 if (!(ctx->mode & FMODE_WRITE))
937 return;
938 if (!is_sync)
939 return;
940 inode = d_inode(ctx->dentry);
941 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
942 return;
943 nfsi = NFS_I(inode);
944 if (inode->i_mapping->nrpages == 0)
945 return;
946 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
947 return;
948 if (!list_empty(&nfsi->open_files))
949 return;
950 server = NFS_SERVER(inode);
951 if (server->flags & NFS_MOUNT_NOCTO)
952 return;
953 nfs_revalidate_inode(server, inode);
954}
955EXPORT_SYMBOL_GPL(nfs_close_context);
956
957struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
958 fmode_t f_mode,
959 struct file *filp)
960{
961 struct nfs_open_context *ctx;
962 const struct cred *cred = get_current_cred();
963
964 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
965 if (!ctx) {
966 put_cred(cred);
967 return ERR_PTR(-ENOMEM);
968 }
969 nfs_sb_active(dentry->d_sb);
970 ctx->dentry = dget(dentry);
971 ctx->cred = cred;
972 ctx->ll_cred = NULL;
973 ctx->state = NULL;
974 ctx->mode = f_mode;
975 ctx->flags = 0;
976 ctx->error = 0;
977 ctx->flock_owner = (fl_owner_t)filp;
978 nfs_init_lock_context(&ctx->lock_context);
979 ctx->lock_context.open_context = ctx;
980 INIT_LIST_HEAD(&ctx->list);
981 ctx->mdsthreshold = NULL;
982 return ctx;
983}
984EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
985
986struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
987{
988 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
989 return ctx;
990 return NULL;
991}
992EXPORT_SYMBOL_GPL(get_nfs_open_context);
993
994static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
995{
996 struct inode *inode = d_inode(ctx->dentry);
997 struct super_block *sb = ctx->dentry->d_sb;
998
999 if (!refcount_dec_and_test(&ctx->lock_context.count))
1000 return;
1001 if (!list_empty(&ctx->list)) {
1002 spin_lock(&inode->i_lock);
1003 list_del_rcu(&ctx->list);
1004 spin_unlock(&inode->i_lock);
1005 }
1006 if (inode != NULL)
1007 NFS_PROTO(inode)->close_context(ctx, is_sync);
1008 put_cred(ctx->cred);
1009 dput(ctx->dentry);
1010 nfs_sb_deactive(sb);
1011 put_rpccred(ctx->ll_cred);
1012 kfree(ctx->mdsthreshold);
1013 kfree_rcu(ctx, rcu_head);
1014}
1015
1016void put_nfs_open_context(struct nfs_open_context *ctx)
1017{
1018 __put_nfs_open_context(ctx, 0);
1019}
1020EXPORT_SYMBOL_GPL(put_nfs_open_context);
1021
1022static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1023{
1024 __put_nfs_open_context(ctx, 1);
1025}
1026
1027/*
1028 * Ensure that mmap has a recent RPC credential for use when writing out
1029 * shared pages
1030 */
1031void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1032{
1033 struct inode *inode = d_inode(ctx->dentry);
1034 struct nfs_inode *nfsi = NFS_I(inode);
1035
1036 spin_lock(&inode->i_lock);
1037 if (list_empty(&nfsi->open_files) &&
1038 (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER))
1039 nfsi->cache_validity |= NFS_INO_INVALID_DATA |
1040 NFS_INO_REVAL_FORCED;
1041 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1042 spin_unlock(&inode->i_lock);
1043}
1044EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1045
1046void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1047{
1048 filp->private_data = get_nfs_open_context(ctx);
1049 if (list_empty(&ctx->list))
1050 nfs_inode_attach_open_context(ctx);
1051}
1052EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1053
1054/*
1055 * Given an inode, search for an open context with the desired characteristics
1056 */
1057struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1058{
1059 struct nfs_inode *nfsi = NFS_I(inode);
1060 struct nfs_open_context *pos, *ctx = NULL;
1061
1062 rcu_read_lock();
1063 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1064 if (cred != NULL && pos->cred != cred)
1065 continue;
1066 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1067 continue;
1068 ctx = get_nfs_open_context(pos);
1069 if (ctx)
1070 break;
1071 }
1072 rcu_read_unlock();
1073 return ctx;
1074}
1075
1076void nfs_file_clear_open_context(struct file *filp)
1077{
1078 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1079
1080 if (ctx) {
1081 struct inode *inode = d_inode(ctx->dentry);
1082
1083 /*
1084 * We fatal error on write before. Try to writeback
1085 * every page again.
1086 */
1087 if (ctx->error < 0)
1088 invalidate_inode_pages2(inode->i_mapping);
1089 filp->private_data = NULL;
1090 put_nfs_open_context_sync(ctx);
1091 }
1092}
1093
1094/*
1095 * These allocate and release file read/write context information.
1096 */
1097int nfs_open(struct inode *inode, struct file *filp)
1098{
1099 struct nfs_open_context *ctx;
1100
1101 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
1102 if (IS_ERR(ctx))
1103 return PTR_ERR(ctx);
1104 nfs_file_set_open_context(filp, ctx);
1105 put_nfs_open_context(ctx);
1106 nfs_fscache_open_file(inode, filp);
1107 return 0;
1108}
1109EXPORT_SYMBOL_GPL(nfs_open);
1110
1111/*
1112 * This function is called whenever some part of NFS notices that
1113 * the cached attributes have to be refreshed.
1114 */
1115int
1116__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1117{
1118 int status = -ESTALE;
1119 struct nfs4_label *label = NULL;
1120 struct nfs_fattr *fattr = NULL;
1121 struct nfs_inode *nfsi = NFS_I(inode);
1122
1123 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1124 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1125
1126 trace_nfs_revalidate_inode_enter(inode);
1127
1128 if (is_bad_inode(inode))
1129 goto out;
1130 if (NFS_STALE(inode))
1131 goto out;
1132
1133 /* pNFS: Attributes aren't updated until we layoutcommit */
1134 if (S_ISREG(inode->i_mode)) {
1135 status = pnfs_sync_inode(inode, false);
1136 if (status)
1137 goto out;
1138 }
1139
1140 status = -ENOMEM;
1141 fattr = nfs_alloc_fattr();
1142 if (fattr == NULL)
1143 goto out;
1144
1145 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1146
1147 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1148 if (IS_ERR(label)) {
1149 status = PTR_ERR(label);
1150 goto out;
1151 }
1152
1153 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1154 label, inode);
1155 if (status != 0) {
1156 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1157 inode->i_sb->s_id,
1158 (unsigned long long)NFS_FILEID(inode), status);
1159 if (status == -ESTALE) {
1160 nfs_zap_caches(inode);
1161 if (!S_ISDIR(inode->i_mode))
1162 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1163 }
1164 goto err_out;
1165 }
1166
1167 status = nfs_refresh_inode(inode, fattr);
1168 if (status) {
1169 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1170 inode->i_sb->s_id,
1171 (unsigned long long)NFS_FILEID(inode), status);
1172 goto err_out;
1173 }
1174
1175 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1176 nfs_zap_acl_cache(inode);
1177
1178 nfs_setsecurity(inode, fattr, label);
1179
1180 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1181 inode->i_sb->s_id,
1182 (unsigned long long)NFS_FILEID(inode));
1183
1184err_out:
1185 nfs4_label_free(label);
1186out:
1187 nfs_free_fattr(fattr);
1188 trace_nfs_revalidate_inode_exit(inode, status);
1189 return status;
1190}
1191
1192int nfs_attribute_cache_expired(struct inode *inode)
1193{
1194 if (nfs_have_delegated_attributes(inode))
1195 return 0;
1196 return nfs_attribute_timeout(inode);
1197}
1198
1199/**
1200 * nfs_revalidate_inode - Revalidate the inode attributes
1201 * @server: pointer to nfs_server struct
1202 * @inode: pointer to inode struct
1203 *
1204 * Updates inode attribute information by retrieving the data from the server.
1205 */
1206int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1207{
1208 if (!nfs_need_revalidate_inode(inode))
1209 return NFS_STALE(inode) ? -ESTALE : 0;
1210 return __nfs_revalidate_inode(server, inode);
1211}
1212EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1213
1214static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1215{
1216 struct nfs_inode *nfsi = NFS_I(inode);
1217 int ret;
1218
1219 if (mapping->nrpages != 0) {
1220 if (S_ISREG(inode->i_mode)) {
1221 ret = nfs_sync_mapping(mapping);
1222 if (ret < 0)
1223 return ret;
1224 }
1225 ret = invalidate_inode_pages2(mapping);
1226 if (ret < 0)
1227 return ret;
1228 }
1229 if (S_ISDIR(inode->i_mode)) {
1230 spin_lock(&inode->i_lock);
1231 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1232 spin_unlock(&inode->i_lock);
1233 }
1234 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1235 nfs_fscache_wait_on_invalidate(inode);
1236
1237 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1238 inode->i_sb->s_id,
1239 (unsigned long long)NFS_FILEID(inode));
1240 return 0;
1241}
1242
1243bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1244{
1245 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1246 NFS_STALE(inode);
1247}
1248
1249int nfs_revalidate_mapping_rcu(struct inode *inode)
1250{
1251 struct nfs_inode *nfsi = NFS_I(inode);
1252 unsigned long *bitlock = &nfsi->flags;
1253 int ret = 0;
1254
1255 if (IS_SWAPFILE(inode))
1256 goto out;
1257 if (nfs_mapping_need_revalidate_inode(inode)) {
1258 ret = -ECHILD;
1259 goto out;
1260 }
1261 spin_lock(&inode->i_lock);
1262 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1263 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1264 ret = -ECHILD;
1265 spin_unlock(&inode->i_lock);
1266out:
1267 return ret;
1268}
1269
1270/**
1271 * nfs_revalidate_mapping - Revalidate the pagecache
1272 * @inode: pointer to host inode
1273 * @mapping: pointer to mapping
1274 */
1275int nfs_revalidate_mapping(struct inode *inode,
1276 struct address_space *mapping)
1277{
1278 struct nfs_inode *nfsi = NFS_I(inode);
1279 unsigned long *bitlock = &nfsi->flags;
1280 int ret = 0;
1281
1282 /* swapfiles are not supposed to be shared. */
1283 if (IS_SWAPFILE(inode))
1284 goto out;
1285
1286 if (nfs_mapping_need_revalidate_inode(inode)) {
1287 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1288 if (ret < 0)
1289 goto out;
1290 }
1291
1292 /*
1293 * We must clear NFS_INO_INVALID_DATA first to ensure that
1294 * invalidations that come in while we're shooting down the mappings
1295 * are respected. But, that leaves a race window where one revalidator
1296 * can clear the flag, and then another checks it before the mapping
1297 * gets invalidated. Fix that by serializing access to this part of
1298 * the function.
1299 *
1300 * At the same time, we need to allow other tasks to see whether we
1301 * might be in the middle of invalidating the pages, so we only set
1302 * the bit lock here if it looks like we're going to be doing that.
1303 */
1304 for (;;) {
1305 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1306 nfs_wait_bit_killable, TASK_KILLABLE);
1307 if (ret)
1308 goto out;
1309 spin_lock(&inode->i_lock);
1310 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1311 spin_unlock(&inode->i_lock);
1312 continue;
1313 }
1314 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1315 break;
1316 spin_unlock(&inode->i_lock);
1317 goto out;
1318 }
1319
1320 set_bit(NFS_INO_INVALIDATING, bitlock);
1321 smp_wmb();
1322 nfsi->cache_validity &= ~(NFS_INO_INVALID_DATA|
1323 NFS_INO_DATA_INVAL_DEFER);
1324 spin_unlock(&inode->i_lock);
1325 trace_nfs_invalidate_mapping_enter(inode);
1326 ret = nfs_invalidate_mapping(inode, mapping);
1327 trace_nfs_invalidate_mapping_exit(inode, ret);
1328
1329 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1330 smp_mb__after_atomic();
1331 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1332out:
1333 return ret;
1334}
1335
1336static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1337{
1338 struct inode *inode = &nfsi->vfs_inode;
1339
1340 if (!S_ISREG(inode->i_mode))
1341 return false;
1342 if (list_empty(&nfsi->open_files))
1343 return false;
1344 return inode_is_open_for_write(inode);
1345}
1346
1347static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1348{
1349 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1350}
1351
1352static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1353{
1354 struct timespec ts;
1355
1356 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1357 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1358 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1359 inode_set_iversion_raw(inode, fattr->change_attr);
1360 if (S_ISDIR(inode->i_mode))
1361 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1362 }
1363 /* If we have atomic WCC data, we may update some attributes */
1364 ts = timespec64_to_timespec(inode->i_ctime);
1365 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1366 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1367 && timespec_equal(&ts, &fattr->pre_ctime)) {
1368 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
1369 }
1370
1371 ts = timespec64_to_timespec(inode->i_mtime);
1372 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1373 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1374 && timespec_equal(&ts, &fattr->pre_mtime)) {
1375 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
1376 if (S_ISDIR(inode->i_mode))
1377 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1378 }
1379 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1380 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1381 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1382 && !nfs_have_writebacks(inode)) {
1383 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1384 }
1385}
1386
1387/**
1388 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1389 * @inode: pointer to inode
1390 * @fattr: updated attributes
1391 *
1392 * Verifies the attribute cache. If we have just changed the attributes,
1393 * so that fattr carries weak cache consistency data, then it may
1394 * also update the ctime/mtime/change_attribute.
1395 */
1396static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1397{
1398 struct nfs_inode *nfsi = NFS_I(inode);
1399 loff_t cur_size, new_isize;
1400 unsigned long invalid = 0;
1401 struct timespec ts;
1402
1403 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1404 return 0;
1405
1406 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1407 /* Only a mounted-on-fileid? Just exit */
1408 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1409 return 0;
1410 /* Has the inode gone and changed behind our back? */
1411 } else if (nfsi->fileid != fattr->fileid) {
1412 /* Is this perhaps the mounted-on fileid? */
1413 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1414 nfsi->fileid == fattr->mounted_on_fileid)
1415 return 0;
1416 return -ESTALE;
1417 }
1418 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1419 return -ESTALE;
1420
1421
1422 if (!nfs_file_has_buffered_writers(nfsi)) {
1423 /* Verify a few of the more important attributes */
1424 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1425 invalid |= NFS_INO_INVALID_CHANGE
1426 | NFS_INO_REVAL_PAGECACHE;
1427
1428 ts = timespec64_to_timespec(inode->i_mtime);
1429 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&ts, &fattr->mtime))
1430 invalid |= NFS_INO_INVALID_MTIME;
1431
1432 ts = timespec64_to_timespec(inode->i_ctime);
1433 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&ts, &fattr->ctime))
1434 invalid |= NFS_INO_INVALID_CTIME;
1435
1436 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1437 cur_size = i_size_read(inode);
1438 new_isize = nfs_size_to_loff_t(fattr->size);
1439 if (cur_size != new_isize)
1440 invalid |= NFS_INO_INVALID_SIZE
1441 | NFS_INO_REVAL_PAGECACHE;
1442 }
1443 }
1444
1445 /* Have any file permissions changed? */
1446 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1447 invalid |= NFS_INO_INVALID_ACCESS
1448 | NFS_INO_INVALID_ACL
1449 | NFS_INO_INVALID_OTHER;
1450 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1451 invalid |= NFS_INO_INVALID_ACCESS
1452 | NFS_INO_INVALID_ACL
1453 | NFS_INO_INVALID_OTHER;
1454 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1455 invalid |= NFS_INO_INVALID_ACCESS
1456 | NFS_INO_INVALID_ACL
1457 | NFS_INO_INVALID_OTHER;
1458
1459 /* Has the link count changed? */
1460 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1461 invalid |= NFS_INO_INVALID_OTHER;
1462
1463 ts = timespec64_to_timespec(inode->i_atime);
1464 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&ts, &fattr->atime))
1465 invalid |= NFS_INO_INVALID_ATIME;
1466
1467 if (invalid != 0)
1468 nfs_set_cache_invalid(inode, invalid);
1469
1470 nfsi->read_cache_jiffies = fattr->time_start;
1471 return 0;
1472}
1473
1474static atomic_long_t nfs_attr_generation_counter;
1475
1476static unsigned long nfs_read_attr_generation_counter(void)
1477{
1478 return atomic_long_read(&nfs_attr_generation_counter);
1479}
1480
1481unsigned long nfs_inc_attr_generation_counter(void)
1482{
1483 return atomic_long_inc_return(&nfs_attr_generation_counter);
1484}
1485EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1486
1487void nfs_fattr_init(struct nfs_fattr *fattr)
1488{
1489 fattr->valid = 0;
1490 fattr->time_start = jiffies;
1491 fattr->gencount = nfs_inc_attr_generation_counter();
1492 fattr->owner_name = NULL;
1493 fattr->group_name = NULL;
1494}
1495EXPORT_SYMBOL_GPL(nfs_fattr_init);
1496
1497/**
1498 * nfs_fattr_set_barrier
1499 * @fattr: attributes
1500 *
1501 * Used to set a barrier after an attribute was updated. This
1502 * barrier ensures that older attributes from RPC calls that may
1503 * have raced with our update cannot clobber these new values.
1504 * Note that you are still responsible for ensuring that other
1505 * operations which change the attribute on the server do not
1506 * collide.
1507 */
1508void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1509{
1510 fattr->gencount = nfs_inc_attr_generation_counter();
1511}
1512
1513struct nfs_fattr *nfs_alloc_fattr(void)
1514{
1515 struct nfs_fattr *fattr;
1516
1517 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1518 if (fattr != NULL)
1519 nfs_fattr_init(fattr);
1520 return fattr;
1521}
1522EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1523
1524struct nfs_fh *nfs_alloc_fhandle(void)
1525{
1526 struct nfs_fh *fh;
1527
1528 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1529 if (fh != NULL)
1530 fh->size = 0;
1531 return fh;
1532}
1533EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1534
1535#ifdef NFS_DEBUG
1536/*
1537 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1538 * in the same way that wireshark does
1539 *
1540 * @fh: file handle
1541 *
1542 * For debugging only.
1543 */
1544u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1545{
1546 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1547 * not on the result */
1548 return nfs_fhandle_hash(fh);
1549}
1550EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1551
1552/*
1553 * _nfs_display_fhandle - display an NFS file handle on the console
1554 *
1555 * @fh: file handle to display
1556 * @caption: display caption
1557 *
1558 * For debugging only.
1559 */
1560void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1561{
1562 unsigned short i;
1563
1564 if (fh == NULL || fh->size == 0) {
1565 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1566 return;
1567 }
1568
1569 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1570 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1571 for (i = 0; i < fh->size; i += 16) {
1572 __be32 *pos = (__be32 *)&fh->data[i];
1573
1574 switch ((fh->size - i - 1) >> 2) {
1575 case 0:
1576 printk(KERN_DEFAULT " %08x\n",
1577 be32_to_cpup(pos));
1578 break;
1579 case 1:
1580 printk(KERN_DEFAULT " %08x %08x\n",
1581 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1582 break;
1583 case 2:
1584 printk(KERN_DEFAULT " %08x %08x %08x\n",
1585 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1586 be32_to_cpup(pos + 2));
1587 break;
1588 default:
1589 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1590 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1591 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1592 }
1593 }
1594}
1595EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1596#endif
1597
1598/**
1599 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1600 * @inode: pointer to inode
1601 * @fattr: attributes
1602 *
1603 * Attempt to divine whether or not an RPC call reply carrying stale
1604 * attributes got scheduled after another call carrying updated ones.
1605 *
1606 * To do so, the function first assumes that a more recent ctime means
1607 * that the attributes in fattr are newer, however it also attempt to
1608 * catch the case where ctime either didn't change, or went backwards
1609 * (if someone reset the clock on the server) by looking at whether
1610 * or not this RPC call was started after the inode was last updated.
1611 * Note also the check for wraparound of 'attr_gencount'
1612 *
1613 * The function returns 'true' if it thinks the attributes in 'fattr' are
1614 * more recent than the ones cached in the inode.
1615 *
1616 */
1617static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1618{
1619 const struct nfs_inode *nfsi = NFS_I(inode);
1620
1621 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1622 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1623}
1624
1625static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1626{
1627 int ret;
1628
1629 trace_nfs_refresh_inode_enter(inode);
1630
1631 if (nfs_inode_attrs_need_update(inode, fattr))
1632 ret = nfs_update_inode(inode, fattr);
1633 else
1634 ret = nfs_check_inode_attributes(inode, fattr);
1635
1636 trace_nfs_refresh_inode_exit(inode, ret);
1637 return ret;
1638}
1639
1640/**
1641 * nfs_refresh_inode - try to update the inode attribute cache
1642 * @inode: pointer to inode
1643 * @fattr: updated attributes
1644 *
1645 * Check that an RPC call that returned attributes has not overlapped with
1646 * other recent updates of the inode metadata, then decide whether it is
1647 * safe to do a full update of the inode attributes, or whether just to
1648 * call nfs_check_inode_attributes.
1649 */
1650int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1651{
1652 int status;
1653
1654 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1655 return 0;
1656 spin_lock(&inode->i_lock);
1657 status = nfs_refresh_inode_locked(inode, fattr);
1658 spin_unlock(&inode->i_lock);
1659
1660 return status;
1661}
1662EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1663
1664static int nfs_post_op_update_inode_locked(struct inode *inode,
1665 struct nfs_fattr *fattr, unsigned int invalid)
1666{
1667 if (S_ISDIR(inode->i_mode))
1668 invalid |= NFS_INO_INVALID_DATA;
1669 nfs_set_cache_invalid(inode, invalid);
1670 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1671 return 0;
1672 return nfs_refresh_inode_locked(inode, fattr);
1673}
1674
1675/**
1676 * nfs_post_op_update_inode - try to update the inode attribute cache
1677 * @inode: pointer to inode
1678 * @fattr: updated attributes
1679 *
1680 * After an operation that has changed the inode metadata, mark the
1681 * attribute cache as being invalid, then try to update it.
1682 *
1683 * NB: if the server didn't return any post op attributes, this
1684 * function will force the retrieval of attributes before the next
1685 * NFS request. Thus it should be used only for operations that
1686 * are expected to change one or more attributes, to avoid
1687 * unnecessary NFS requests and trips through nfs_update_inode().
1688 */
1689int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1690{
1691 int status;
1692
1693 spin_lock(&inode->i_lock);
1694 nfs_fattr_set_barrier(fattr);
1695 status = nfs_post_op_update_inode_locked(inode, fattr,
1696 NFS_INO_INVALID_CHANGE
1697 | NFS_INO_INVALID_CTIME
1698 | NFS_INO_REVAL_FORCED);
1699 spin_unlock(&inode->i_lock);
1700
1701 return status;
1702}
1703EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1704
1705/**
1706 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1707 * @inode: pointer to inode
1708 * @fattr: updated attributes
1709 *
1710 * After an operation that has changed the inode metadata, mark the
1711 * attribute cache as being invalid, then try to update it. Fake up
1712 * weak cache consistency data, if none exist.
1713 *
1714 * This function is mainly designed to be used by the ->write_done() functions.
1715 */
1716int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1717{
1718 int status;
1719
1720 /* Don't do a WCC update if these attributes are already stale */
1721 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1722 !nfs_inode_attrs_need_update(inode, fattr)) {
1723 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1724 | NFS_ATTR_FATTR_PRESIZE
1725 | NFS_ATTR_FATTR_PREMTIME
1726 | NFS_ATTR_FATTR_PRECTIME);
1727 goto out_noforce;
1728 }
1729 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1730 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1731 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1732 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1733 }
1734 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1735 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1736 fattr->pre_ctime = timespec64_to_timespec(inode->i_ctime);
1737 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1738 }
1739 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1740 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1741 fattr->pre_mtime = timespec64_to_timespec(inode->i_mtime);
1742 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1743 }
1744 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1745 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1746 fattr->pre_size = i_size_read(inode);
1747 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1748 }
1749out_noforce:
1750 status = nfs_post_op_update_inode_locked(inode, fattr,
1751 NFS_INO_INVALID_CHANGE
1752 | NFS_INO_INVALID_CTIME
1753 | NFS_INO_INVALID_MTIME);
1754 return status;
1755}
1756
1757/**
1758 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1759 * @inode: pointer to inode
1760 * @fattr: updated attributes
1761 *
1762 * After an operation that has changed the inode metadata, mark the
1763 * attribute cache as being invalid, then try to update it. Fake up
1764 * weak cache consistency data, if none exist.
1765 *
1766 * This function is mainly designed to be used by the ->write_done() functions.
1767 */
1768int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1769{
1770 int status;
1771
1772 spin_lock(&inode->i_lock);
1773 nfs_fattr_set_barrier(fattr);
1774 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1775 spin_unlock(&inode->i_lock);
1776 return status;
1777}
1778EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1779
1780
1781/*
1782 * Many nfs protocol calls return the new file attributes after
1783 * an operation. Here we update the inode to reflect the state
1784 * of the server's inode.
1785 *
1786 * This is a bit tricky because we have to make sure all dirty pages
1787 * have been sent off to the server before calling invalidate_inode_pages.
1788 * To make sure no other process adds more write requests while we try
1789 * our best to flush them, we make them sleep during the attribute refresh.
1790 *
1791 * A very similar scenario holds for the dir cache.
1792 */
1793static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1794{
1795 struct nfs_server *server;
1796 struct nfs_inode *nfsi = NFS_I(inode);
1797 loff_t cur_isize, new_isize;
1798 unsigned long invalid = 0;
1799 unsigned long now = jiffies;
1800 unsigned long save_cache_validity;
1801 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1802 bool cache_revalidated = true;
1803 bool attr_changed = false;
1804 bool have_delegation;
1805
1806 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1807 __func__, inode->i_sb->s_id, inode->i_ino,
1808 nfs_display_fhandle_hash(NFS_FH(inode)),
1809 atomic_read(&inode->i_count), fattr->valid);
1810
1811 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1812 /* Only a mounted-on-fileid? Just exit */
1813 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1814 return 0;
1815 /* Has the inode gone and changed behind our back? */
1816 } else if (nfsi->fileid != fattr->fileid) {
1817 /* Is this perhaps the mounted-on fileid? */
1818 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1819 nfsi->fileid == fattr->mounted_on_fileid)
1820 return 0;
1821 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1822 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1823 NFS_SERVER(inode)->nfs_client->cl_hostname,
1824 inode->i_sb->s_id, (long long)nfsi->fileid,
1825 (long long)fattr->fileid);
1826 goto out_err;
1827 }
1828
1829 /*
1830 * Make sure the inode's type hasn't changed.
1831 */
1832 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1833 /*
1834 * Big trouble! The inode has become a different object.
1835 */
1836 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1837 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1838 goto out_err;
1839 }
1840
1841 server = NFS_SERVER(inode);
1842 /* Update the fsid? */
1843 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1844 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1845 !IS_AUTOMOUNT(inode))
1846 server->fsid = fattr->fsid;
1847
1848 /* Save the delegation state before clearing cache_validity */
1849 have_delegation = nfs_have_delegated_attributes(inode);
1850
1851 /*
1852 * Update the read time so we don't revalidate too often.
1853 */
1854 nfsi->read_cache_jiffies = fattr->time_start;
1855
1856 save_cache_validity = nfsi->cache_validity;
1857 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1858 | NFS_INO_INVALID_ATIME
1859 | NFS_INO_REVAL_FORCED
1860 | NFS_INO_REVAL_PAGECACHE);
1861
1862 /* Do atomic weak cache consistency updates */
1863 nfs_wcc_update_inode(inode, fattr);
1864
1865 if (pnfs_layoutcommit_outstanding(inode)) {
1866 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1867 cache_revalidated = false;
1868 }
1869
1870 /* More cache consistency checks */
1871 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1872 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
1873 /* Could it be a race with writeback? */
1874 if (!(have_writers || have_delegation)) {
1875 invalid |= NFS_INO_INVALID_DATA
1876 | NFS_INO_INVALID_ACCESS
1877 | NFS_INO_INVALID_ACL;
1878 /* Force revalidate of all attributes */
1879 save_cache_validity |= NFS_INO_INVALID_CTIME
1880 | NFS_INO_INVALID_MTIME
1881 | NFS_INO_INVALID_SIZE
1882 | NFS_INO_INVALID_OTHER;
1883 if (S_ISDIR(inode->i_mode))
1884 nfs_force_lookup_revalidate(inode);
1885 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1886 inode->i_sb->s_id,
1887 inode->i_ino);
1888 } else if (!have_delegation)
1889 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1890 inode_set_iversion_raw(inode, fattr->change_attr);
1891 attr_changed = true;
1892 }
1893 } else {
1894 nfsi->cache_validity |= save_cache_validity &
1895 (NFS_INO_INVALID_CHANGE
1896 | NFS_INO_REVAL_PAGECACHE
1897 | NFS_INO_REVAL_FORCED);
1898 cache_revalidated = false;
1899 }
1900
1901 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1902 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
1903 } else if (server->caps & NFS_CAP_MTIME) {
1904 nfsi->cache_validity |= save_cache_validity &
1905 (NFS_INO_INVALID_MTIME
1906 | NFS_INO_REVAL_FORCED);
1907 cache_revalidated = false;
1908 }
1909
1910 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1911 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
1912 } else if (server->caps & NFS_CAP_CTIME) {
1913 nfsi->cache_validity |= save_cache_validity &
1914 (NFS_INO_INVALID_CTIME
1915 | NFS_INO_REVAL_FORCED);
1916 cache_revalidated = false;
1917 }
1918
1919 /* Check if our cached file size is stale */
1920 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1921 new_isize = nfs_size_to_loff_t(fattr->size);
1922 cur_isize = i_size_read(inode);
1923 if (new_isize != cur_isize && !have_delegation) {
1924 /* Do we perhaps have any outstanding writes, or has
1925 * the file grown beyond our last write? */
1926 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
1927 i_size_write(inode, new_isize);
1928 if (!have_writers)
1929 invalid |= NFS_INO_INVALID_DATA;
1930 attr_changed = true;
1931 }
1932 dprintk("NFS: isize change on server for file %s/%ld "
1933 "(%Ld to %Ld)\n",
1934 inode->i_sb->s_id,
1935 inode->i_ino,
1936 (long long)cur_isize,
1937 (long long)new_isize);
1938 }
1939 } else {
1940 nfsi->cache_validity |= save_cache_validity &
1941 (NFS_INO_INVALID_SIZE
1942 | NFS_INO_REVAL_PAGECACHE
1943 | NFS_INO_REVAL_FORCED);
1944 cache_revalidated = false;
1945 }
1946
1947
1948 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1949 inode->i_atime = timespec_to_timespec64(fattr->atime);
1950 else if (server->caps & NFS_CAP_ATIME) {
1951 nfsi->cache_validity |= save_cache_validity &
1952 (NFS_INO_INVALID_ATIME
1953 | NFS_INO_REVAL_FORCED);
1954 cache_revalidated = false;
1955 }
1956
1957 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1958 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1959 umode_t newmode = inode->i_mode & S_IFMT;
1960 newmode |= fattr->mode & S_IALLUGO;
1961 inode->i_mode = newmode;
1962 invalid |= NFS_INO_INVALID_ACCESS
1963 | NFS_INO_INVALID_ACL;
1964 attr_changed = true;
1965 }
1966 } else if (server->caps & NFS_CAP_MODE) {
1967 nfsi->cache_validity |= save_cache_validity &
1968 (NFS_INO_INVALID_OTHER
1969 | NFS_INO_REVAL_FORCED);
1970 cache_revalidated = false;
1971 }
1972
1973 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1974 if (!uid_eq(inode->i_uid, fattr->uid)) {
1975 invalid |= NFS_INO_INVALID_ACCESS
1976 | NFS_INO_INVALID_ACL;
1977 inode->i_uid = fattr->uid;
1978 attr_changed = true;
1979 }
1980 } else if (server->caps & NFS_CAP_OWNER) {
1981 nfsi->cache_validity |= save_cache_validity &
1982 (NFS_INO_INVALID_OTHER
1983 | NFS_INO_REVAL_FORCED);
1984 cache_revalidated = false;
1985 }
1986
1987 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1988 if (!gid_eq(inode->i_gid, fattr->gid)) {
1989 invalid |= NFS_INO_INVALID_ACCESS
1990 | NFS_INO_INVALID_ACL;
1991 inode->i_gid = fattr->gid;
1992 attr_changed = true;
1993 }
1994 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
1995 nfsi->cache_validity |= save_cache_validity &
1996 (NFS_INO_INVALID_OTHER
1997 | NFS_INO_REVAL_FORCED);
1998 cache_revalidated = false;
1999 }
2000
2001 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2002 if (inode->i_nlink != fattr->nlink) {
2003 if (S_ISDIR(inode->i_mode))
2004 invalid |= NFS_INO_INVALID_DATA;
2005 set_nlink(inode, fattr->nlink);
2006 attr_changed = true;
2007 }
2008 } else if (server->caps & NFS_CAP_NLINK) {
2009 nfsi->cache_validity |= save_cache_validity &
2010 (NFS_INO_INVALID_OTHER
2011 | NFS_INO_REVAL_FORCED);
2012 cache_revalidated = false;
2013 }
2014
2015 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2016 /*
2017 * report the blocks in 512byte units
2018 */
2019 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2020 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2021 inode->i_blocks = fattr->du.nfs2.blocks;
2022 else
2023 cache_revalidated = false;
2024
2025 /* Update attrtimeo value if we're out of the unstable period */
2026 if (attr_changed) {
2027 invalid &= ~NFS_INO_INVALID_ATTR;
2028 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2029 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2030 nfsi->attrtimeo_timestamp = now;
2031 /* Set barrier to be more recent than all outstanding updates */
2032 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2033 } else {
2034 if (cache_revalidated) {
2035 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2036 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2037 nfsi->attrtimeo <<= 1;
2038 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2039 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2040 }
2041 nfsi->attrtimeo_timestamp = now;
2042 }
2043 /* Set the barrier to be more recent than this fattr */
2044 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
2045 nfsi->attr_gencount = fattr->gencount;
2046 }
2047
2048 /* Don't invalidate the data if we were to blame */
2049 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2050 || S_ISLNK(inode->i_mode)))
2051 invalid &= ~NFS_INO_INVALID_DATA;
2052 nfs_set_cache_invalid(inode, invalid);
2053
2054 return 0;
2055 out_err:
2056 /*
2057 * No need to worry about unhashing the dentry, as the
2058 * lookup validation will know that the inode is bad.
2059 * (But we fall through to invalidate the caches.)
2060 */
2061 nfs_invalidate_inode(inode);
2062 return -ESTALE;
2063}
2064
2065struct inode *nfs_alloc_inode(struct super_block *sb)
2066{
2067 struct nfs_inode *nfsi;
2068 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
2069 if (!nfsi)
2070 return NULL;
2071 nfsi->flags = 0UL;
2072 nfsi->cache_validity = 0UL;
2073#if IS_ENABLED(CONFIG_NFS_V4)
2074 nfsi->nfs4_acl = NULL;
2075#endif /* CONFIG_NFS_V4 */
2076 return &nfsi->vfs_inode;
2077}
2078EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2079
2080void nfs_free_inode(struct inode *inode)
2081{
2082 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2083}
2084EXPORT_SYMBOL_GPL(nfs_free_inode);
2085
2086static inline void nfs4_init_once(struct nfs_inode *nfsi)
2087{
2088#if IS_ENABLED(CONFIG_NFS_V4)
2089 INIT_LIST_HEAD(&nfsi->open_states);
2090 nfsi->delegation = NULL;
2091 init_rwsem(&nfsi->rwsem);
2092 nfsi->layout = NULL;
2093#endif
2094}
2095
2096static void init_once(void *foo)
2097{
2098 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2099
2100 inode_init_once(&nfsi->vfs_inode);
2101 INIT_LIST_HEAD(&nfsi->open_files);
2102 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2103 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2104 INIT_LIST_HEAD(&nfsi->commit_info.list);
2105 atomic_long_set(&nfsi->nrequests, 0);
2106 atomic_long_set(&nfsi->commit_info.ncommit, 0);
2107 atomic_set(&nfsi->commit_info.rpcs_out, 0);
2108 init_rwsem(&nfsi->rmdir_sem);
2109 mutex_init(&nfsi->commit_mutex);
2110 nfs4_init_once(nfsi);
2111}
2112
2113static int __init nfs_init_inodecache(void)
2114{
2115 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2116 sizeof(struct nfs_inode),
2117 0, (SLAB_RECLAIM_ACCOUNT|
2118 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2119 init_once);
2120 if (nfs_inode_cachep == NULL)
2121 return -ENOMEM;
2122
2123 return 0;
2124}
2125
2126static void nfs_destroy_inodecache(void)
2127{
2128 /*
2129 * Make sure all delayed rcu free inodes are flushed before we
2130 * destroy cache.
2131 */
2132 rcu_barrier();
2133 kmem_cache_destroy(nfs_inode_cachep);
2134}
2135
2136struct workqueue_struct *nfsiod_workqueue;
2137EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2138
2139/*
2140 * start up the nfsiod workqueue
2141 */
2142static int nfsiod_start(void)
2143{
2144 struct workqueue_struct *wq;
2145 dprintk("RPC: creating workqueue nfsiod\n");
2146 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
2147 if (wq == NULL)
2148 return -ENOMEM;
2149 nfsiod_workqueue = wq;
2150 return 0;
2151}
2152
2153/*
2154 * Destroy the nfsiod workqueue
2155 */
2156static void nfsiod_stop(void)
2157{
2158 struct workqueue_struct *wq;
2159
2160 wq = nfsiod_workqueue;
2161 if (wq == NULL)
2162 return;
2163 nfsiod_workqueue = NULL;
2164 destroy_workqueue(wq);
2165}
2166
2167unsigned int nfs_net_id;
2168EXPORT_SYMBOL_GPL(nfs_net_id);
2169
2170static int nfs_net_init(struct net *net)
2171{
2172 nfs_clients_init(net);
2173 return nfs_fs_proc_net_init(net);
2174}
2175
2176static void nfs_net_exit(struct net *net)
2177{
2178 nfs_fs_proc_net_exit(net);
2179 nfs_clients_exit(net);
2180}
2181
2182static struct pernet_operations nfs_net_ops = {
2183 .init = nfs_net_init,
2184 .exit = nfs_net_exit,
2185 .id = &nfs_net_id,
2186 .size = sizeof(struct nfs_net),
2187};
2188
2189/*
2190 * Initialize NFS
2191 */
2192static int __init init_nfs_fs(void)
2193{
2194 int err;
2195
2196 err = nfs_sysfs_init();
2197 if (err < 0)
2198 goto out10;
2199
2200 err = register_pernet_subsys(&nfs_net_ops);
2201 if (err < 0)
2202 goto out9;
2203
2204 err = nfs_fscache_register();
2205 if (err < 0)
2206 goto out8;
2207
2208 err = nfsiod_start();
2209 if (err)
2210 goto out7;
2211
2212 err = nfs_fs_proc_init();
2213 if (err)
2214 goto out6;
2215
2216 err = nfs_init_nfspagecache();
2217 if (err)
2218 goto out5;
2219
2220 err = nfs_init_inodecache();
2221 if (err)
2222 goto out4;
2223
2224 err = nfs_init_readpagecache();
2225 if (err)
2226 goto out3;
2227
2228 err = nfs_init_writepagecache();
2229 if (err)
2230 goto out2;
2231
2232 err = nfs_init_directcache();
2233 if (err)
2234 goto out1;
2235
2236 rpc_proc_register(&init_net, &nfs_rpcstat);
2237
2238 err = register_nfs_fs();
2239 if (err)
2240 goto out0;
2241
2242 return 0;
2243out0:
2244 rpc_proc_unregister(&init_net, "nfs");
2245 nfs_destroy_directcache();
2246out1:
2247 nfs_destroy_writepagecache();
2248out2:
2249 nfs_destroy_readpagecache();
2250out3:
2251 nfs_destroy_inodecache();
2252out4:
2253 nfs_destroy_nfspagecache();
2254out5:
2255 nfs_fs_proc_exit();
2256out6:
2257 nfsiod_stop();
2258out7:
2259 nfs_fscache_unregister();
2260out8:
2261 unregister_pernet_subsys(&nfs_net_ops);
2262out9:
2263 nfs_sysfs_exit();
2264out10:
2265 return err;
2266}
2267
2268static void __exit exit_nfs_fs(void)
2269{
2270 nfs_destroy_directcache();
2271 nfs_destroy_writepagecache();
2272 nfs_destroy_readpagecache();
2273 nfs_destroy_inodecache();
2274 nfs_destroy_nfspagecache();
2275 nfs_fscache_unregister();
2276 unregister_pernet_subsys(&nfs_net_ops);
2277 rpc_proc_unregister(&init_net, "nfs");
2278 unregister_nfs_fs();
2279 nfs_fs_proc_exit();
2280 nfsiod_stop();
2281 nfs_sysfs_exit();
2282}
2283
2284/* Not quite true; I just maintain it */
2285MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2286MODULE_LICENSE("GPL");
2287module_param(enable_ino64, bool, 0644);
2288
2289module_init(init_nfs_fs)
2290module_exit(exit_nfs_fs)