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exec: handle idmapped mounts
[linux-2.6-block.git] / fs / nfs / inode.c
CommitLineData
09c434b8 1// SPDX-License-Identifier: GPL-2.0-only
1da177e4
LT		 2/*
3 * linux/fs/nfs/inode.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * nfs inode and superblock handling functions
8 *
526719ba 9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
1da177e4
LT		 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
1da177e4
LT		 17#include <linux/module.h>
18#include <linux/init.h>
174cd4b1 19#include <linux/sched/signal.h>
1da177e4
LT		 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>
4ece3a2d 29#include <linux/sunrpc/metrics.h>
1da177e4
LT		 30#include <linux/nfs_fs.h>
31#include <linux/nfs_mount.h>
32#include <linux/nfs4_mount.h>
33#include <linux/lockd/bind.h>
1da177e4
LT		 34#include <linux/seq_file.h>
35#include <linux/mount.h>
1da177e4 36#include <linux/vfs.h>
9cdb3883
MN		 37#include <linux/inet.h>
38#include <linux/nfs_xdr.h>
5a0e3ad6 39#include <linux/slab.h>
3fa0b4e2 40#include <linux/compat.h>
d310310c 41#include <linux/freezer.h>
7c0f6ba6 42#include <linux/uaccess.h>
1eb5d98f 43#include <linux/iversion.h>
1da177e4 44
4ce79717 45#include "nfs4_fs.h"
a72b4422 46#include "callback.h"
1da177e4 47#include "delegation.h"
d9ef5a8c 48#include "iostat.h"
f7b422b1 49#include "internal.h"
8ec442ae 50#include "fscache.h"
e5e94017 51#include "pnfs.h"
ab7017a3 52#include "nfs.h"
1b340d01 53#include "netns.h"
996bc4f4 54#include "sysfs.h"
1da177e4 55
f4ce1299
TM		 56#include "nfstrace.h"
57
1da177e4 58#define NFSDBG_FACILITY NFSDBG_VFS
1da177e4 59
f43bf0be
TM		 60#define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
61
62/* Default is to see 64-bit inode numbers */
90ab5ee9 63static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
f43bf0be 64
24aa1fe6 65static int nfs_update_inode(struct inode *, struct nfs_fattr *);
1da177e4 66
e18b890b 67static struct kmem_cache * nfs_inode_cachep;
b7fa0554 68
1da177e4
LT		 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
210c7c17 75static int nfs_wait_killable(int mode)
72cb77f4 76{
416ad3c9 77 freezable_schedule_unsafe();
dfd01f02
PZ		 78 if (signal_pending_state(mode, current))
79 return -ERESTARTSYS;
72cb77f4
TM		 80 return 0;
81}
210c7c17
BC		 82
83int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
84{
85 return nfs_wait_killable(mode);
86}
89d77c8f 87EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
72cb77f4 88
f43bf0be
TM		 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{
3fa0b4e2
FF		 98#ifdef CONFIG_COMPAT
99 compat_ulong_t ino;
100#else
101 unsigned long ino;
102#endif
f43bf0be
TM		 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
eed99357
TM		 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
19d87ca3 118void nfs_clear_inode(struct inode *inode)
1da177e4 119{
da6d503a
TM		 120 /*
121 * The following should never happen...
122 */
f48407dd
TM		 123 WARN_ON_ONCE(nfs_have_writebacks(inode));
124 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
ada70d94 125 nfs_zap_acl_cache(inode);
1c3c07e9 126 nfs_access_zap_cache(inode);
f1fe29b4 127 nfs_fscache_clear_inode(inode);
1da177e4 128}
89d77c8f 129EXPORT_SYMBOL_GPL(nfs_clear_inode);
1da177e4 130
b57922d9
AV		 131void nfs_evict_inode(struct inode *inode)
132{
91b0abe3 133 truncate_inode_pages_final(&inode->i_data);
dbd5768f 134 clear_inode(inode);
b57922d9
AV		 135 nfs_clear_inode(inode);
136}
137
9e1681c2 138int nfs_sync_inode(struct inode *inode)
4d346bea 139{
95d9f6c3 140 inode_dio_wait(inode);
4d346bea
TM		 141 return nfs_wb_all(inode);
142}
9e1681c2 143EXPORT_SYMBOL_GPL(nfs_sync_inode);
4d346bea 144
29884df0
TM		 145/**
146 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
302fad7b 147 * @mapping: pointer to struct address_space
29884df0
TM		 148 */
149int nfs_sync_mapping(struct address_space *mapping)
150{
5cf95214 151 int ret = 0;
29884df0 152
5cf95214
TM		 153 if (mapping->nrpages != 0) {
154 unmap_mapping_range(mapping, 0, 0, 0);
155 ret = nfs_wb_all(mapping->host);
156 }
29884df0
TM		 157 return ret;
158}
159
187e593d
TM		 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
61540bf6
TM		 167static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
168{
169 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
170
171 /* Special case for the pagecache or access cache */
172 if (flags == NFS_INO_REVAL_PAGECACHE &&
173 !(cache_validity & NFS_INO_REVAL_FORCED))
174 return false;
175 return (cache_validity & flags) != 0;
176}
177
178static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
179{
180 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
181
182 if ((cache_validity & flags) != 0)
183 return true;
184 if (nfs_attribute_timeout(inode))
185 return true;
186 return false;
187}
188
189bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
190{
191 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
192 return nfs_check_cache_invalid_delegated(inode, flags);
193
194 return nfs_check_cache_invalid_not_delegated(inode, flags);
195}
95ad37f9 196EXPORT_SYMBOL_GPL(nfs_check_cache_invalid);
61540bf6 197
6edf9609
TM		 198static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
199{
200 struct nfs_inode *nfsi = NFS_I(inode);
3f0b3cf4
TM		 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
0f44da51
FL		 208 | NFS_INO_REVAL_PAGECACHE
209 | NFS_INO_INVALID_XATTR);
3f0b3cf4 210 }
6edf9609
TM		 211
212 if (inode->i_mapping->nrpages == 0)
1c341b77 213 flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER);
6edf9609
TM		 214 nfsi->cache_validity |= flags;
215 if (flags & NFS_INO_INVALID_DATA)
216 nfs_fscache_invalidate(inode);
217}
218
1da177e4
LT		 219/*
220 * Invalidate the local caches
221 */
b37b03b7 222static void nfs_zap_caches_locked(struct inode *inode)
1da177e4
LT		 223{
224 struct nfs_inode *nfsi = NFS_I(inode);
225 int mode = inode->i_mode;
226
91d5b470
CL		 227 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
228
c7c20973
TM		 229 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
230 nfsi->attrtimeo_timestamp = jiffies;
1da177e4 231
de242c0b 232 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
6edf9609 233 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 234 | NFS_INO_INVALID_DATA
235 | NFS_INO_INVALID_ACCESS
236 | NFS_INO_INVALID_ACL
95ad37f9 237 | NFS_INO_INVALID_XATTR
6edf9609 238 | NFS_INO_REVAL_PAGECACHE);
aa9c2669 239 } else
6edf9609 240 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 241 | NFS_INO_INVALID_ACCESS
242 | NFS_INO_INVALID_ACL
95ad37f9 243 | NFS_INO_INVALID_XATTR
6edf9609 244 | NFS_INO_REVAL_PAGECACHE);
fd1defc2 245 nfs_zap_label_cache_locked(nfsi);
b37b03b7 246}
dc59250c 247
b37b03b7
TM		 248void nfs_zap_caches(struct inode *inode)
249{
250 spin_lock(&inode->i_lock);
251 nfs_zap_caches_locked(inode);
dc59250c 252 spin_unlock(&inode->i_lock);
ada70d94
TM		 253}
254
cd9ae2b6
TM		 255void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
256{
257 if (mapping->nrpages != 0) {
258 spin_lock(&inode->i_lock);
6edf9609 259 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
cd9ae2b6
TM		 260 spin_unlock(&inode->i_lock);
261 }
262}
263
f41f7418 264void nfs_zap_acl_cache(struct inode *inode)
ada70d94
TM		 265{
266 void (*clear_acl_cache)(struct inode *);
267
268 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
269 if (clear_acl_cache != NULL)
270 clear_acl_cache(inode);
dc59250c 271 spin_lock(&inode->i_lock);
55296809 272 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
dc59250c 273 spin_unlock(&inode->i_lock);
1da177e4 274}
1c606fb7 275EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
1da177e4 276
c4812998
TM		 277void nfs_invalidate_atime(struct inode *inode)
278{
279 spin_lock(&inode->i_lock);
6edf9609 280 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
c4812998
TM		 281 spin_unlock(&inode->i_lock);
282}
ddda8e0a 283EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
c4812998 284
1da177e4 285/*
b37b03b7
TM		 286 * Invalidate, but do not unhash, the inode.
287 * NB: must be called with inode->i_lock held!
1da177e4 288 */
93ce4af7 289static void nfs_set_inode_stale_locked(struct inode *inode)
1da177e4 290{
3a10c30a 291 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
b37b03b7 292 nfs_zap_caches_locked(inode);
93ce4af7
TM		 293 trace_nfs_set_inode_stale(inode);
294}
295
296void nfs_set_inode_stale(struct inode *inode)
297{
298 spin_lock(&inode->i_lock);
299 nfs_set_inode_stale_locked(inode);
300 spin_unlock(&inode->i_lock);
1da177e4
LT		 301}
302
303struct nfs_find_desc {
304 struct nfs_fh *fh;
305 struct nfs_fattr *fattr;
306};
307
308/*
309 * In NFSv3 we can have 64bit inode numbers. In order to support
310 * this, and re-exported directories (also seen in NFSv2)
311 * we are forced to allow 2 different inodes to have the same
312 * i_ino.
313 */
314static int
315nfs_find_actor(struct inode *inode, void *opaque)
316{
317 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
318 struct nfs_fh *fh = desc->fh;
319 struct nfs_fattr *fattr = desc->fattr;
320
321 if (NFS_FILEID(inode) != fattr->fileid)
322 return 0;
f6488c9b
JL		 323 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
324 return 0;
1da177e4
LT		 325 if (nfs_compare_fh(NFS_FH(inode), fh))
326 return 0;
327 if (is_bad_inode(inode) || NFS_STALE(inode))
328 return 0;
329 return 1;
330}
331
332static int
333nfs_init_locked(struct inode *inode, void *opaque)
334{
335 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
336 struct nfs_fattr *fattr = desc->fattr;
337
99fadcd7 338 set_nfs_fileid(inode, fattr->fileid);
916ec34d 339 inode->i_mode = fattr->mode;
1da177e4
LT		 340 nfs_copy_fh(NFS_FH(inode), desc->fh);
341 return 0;
342}
343
e058f70b 344#ifdef CONFIG_NFS_V4_SECURITY_LABEL
fd1defc2
TM		 345static void nfs_clear_label_invalid(struct inode *inode)
346{
347 spin_lock(&inode->i_lock);
348 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
349 spin_unlock(&inode->i_lock);
350}
351
aa9c2669
DQ		 352void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
353 struct nfs4_label *label)
354{
355 int error;
356
357 if (label == NULL)
358 return;
359
aa9c2669
DQ		 360 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
361 error = security_inode_notifysecctx(inode, label->label,
362 label->len);
363 if (error)
364 printk(KERN_ERR "%s() %s %d "
365 "security_inode_notifysecctx() %d\n",
366 __func__,
367 (char *)label->label,
368 label->len, error);
fd1defc2 369 nfs_clear_label_invalid(inode);
aa9c2669
DQ		 370 }
371}
372
e058f70b
SD		 373struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
374{
375 struct nfs4_label *label = NULL;
376 int minor_version = server->nfs_client->cl_minorversion;
377
378 if (minor_version < 2)
379 return label;
380
381 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
382 return label;
383
384 label = kzalloc(sizeof(struct nfs4_label), flags);
385 if (label == NULL)
386 return ERR_PTR(-ENOMEM);
387
388 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
389 if (label->label == NULL) {
390 kfree(label);
391 return ERR_PTR(-ENOMEM);
392 }
393 label->len = NFS4_MAXLABELLEN;
394
395 return label;
396}
397EXPORT_SYMBOL_GPL(nfs4_label_alloc);
aa9c2669 398#else
829e57d7 399void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
aa9c2669
DQ		 400 struct nfs4_label *label)
401{
402}
e058f70b 403#endif
aa9c2669 404EXPORT_SYMBOL_GPL(nfs_setsecurity);
e058f70b 405
f174ff7a
PT		 406/* Search for inode identified by fh, fileid and i_mode in inode cache. */
407struct inode *
408nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
409{
410 struct nfs_find_desc desc = {
411 .fh = fh,
412 .fattr = fattr,
413 };
414 struct inode *inode;
415 unsigned long hash;
416
417 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
418 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
419 return NULL;
420
421 hash = nfs_fattr_to_ino_t(fattr);
422 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
423
424 dprintk("%s: returning %p\n", __func__, inode);
425 return inode;
426}
427
1da177e4
LT		 428/*
429 * This is our front-end to iget that looks up inodes by file handle
430 * instead of inode number.
431 */
432struct inode *
1775fd3e 433nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
1da177e4
LT		 434{
435 struct nfs_find_desc desc = {
436 .fh = fh,
437 .fattr = fattr
438 };
03f28e3a 439 struct inode *inode = ERR_PTR(-ENOENT);
1da177e4
LT		 440 unsigned long hash;
441
7ebb9315
BS		 442 nfs_attr_check_mountpoint(sb, fattr);
443
2ef47eb1
AS		 444 if (nfs_attr_use_mounted_on_fileid(fattr))
445 fattr->fileid = fattr->mounted_on_fileid;
446 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
1da177e4 447 goto out_no_inode;
9e6e70f8 448 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
1da177e4 449 goto out_no_inode;
1da177e4
LT		 450
451 hash = nfs_fattr_to_ino_t(fattr);
452
03f28e3a
TM		 453 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
454 if (inode == NULL) {
455 inode = ERR_PTR(-ENOMEM);
1da177e4 456 goto out_no_inode;
03f28e3a 457 }
1da177e4
LT		 458
459 if (inode->i_state & I_NEW) {
460 struct nfs_inode *nfsi = NFS_I(inode);
b0c4fddc 461 unsigned long now = jiffies;
1da177e4
LT		 462
463 /* We set i_ino for the few things that still rely on it,
464 * such as stat(2) */
465 inode->i_ino = hash;
466
467 /* We can't support update_atime(), since the server will reset it */
468 inode->i_flags |= S_NOATIME|S_NOCMTIME;
469 inode->i_mode = fattr->mode;
821a868a 470 nfsi->cache_validity = 0;
62ab460c
TM		 471 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
472 && nfs_server_capable(inode, NFS_CAP_MODE))
16e14375 473 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
1da177e4
LT		 474 /* Why so? Because we want revalidate for devices/FIFOs, and
475 * that's precisely what we have in nfs_file_inode_operations.
476 */
8fa5c000 477 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
1da177e4 478 if (S_ISREG(inode->i_mode)) {
1788ea6e 479 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
1da177e4 480 inode->i_data.a_ops = &nfs_file_aops;
1da177e4 481 } else if (S_ISDIR(inode->i_mode)) {
8fa5c000 482 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
1da177e4 483 inode->i_fop = &nfs_dir_operations;
11de3b11 484 inode->i_data.a_ops = &nfs_dir_aops;
55a97593 485 /* Deal with crossing mountpoints */
7ebb9315
BS		 486 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
487 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
6b97fd3d
MN		 488 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
489 inode->i_op = &nfs_referral_inode_operations;
490 else
491 inode->i_op = &nfs_mountpoint_inode_operations;
55a97593 492 inode->i_fop = NULL;
36d43a43 493 inode->i_flags |= S_AUTOMOUNT;
55a97593 494 }
21fc61c7 495 } else if (S_ISLNK(inode->i_mode)) {
1da177e4 496 inode->i_op = &nfs_symlink_inode_operations;
21fc61c7
AV		 497 inode_nohighmem(inode);
498 } else
1da177e4
LT		 499 init_special_inode(inode, inode->i_mode, fattr->rdev);
500
9e6e70f8
TM		 501 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
502 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
503 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
1eb5d98f 504 inode_set_iversion_raw(inode, 0);
9e6e70f8 505 inode->i_size = 0;
6d6b77f1 506 clear_nlink(inode);
9ff593c4
EB		 507 inode->i_uid = make_kuid(&init_user_ns, -2);
508 inode->i_gid = make_kgid(&init_user_ns, -2);
9e6e70f8
TM		 509 inode->i_blocks = 0;
510 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
2701d086
AA		 511 nfsi->write_io = 0;
512 nfsi->read_io = 0;
9e6e70f8 513
33801147 514 nfsi->read_cache_jiffies = fattr->time_start;
4704f0e2 515 nfsi->attr_gencount = fattr->gencount;
9e6e70f8 516 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
e86d5a02 517 inode->i_atime = fattr->atime;
62ab460c 518 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
16e14375 519 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
9e6e70f8 520 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
e86d5a02 521 inode->i_mtime = fattr->mtime;
62ab460c 522 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
16e14375 523 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
9e6e70f8 524 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 525 inode->i_ctime = fattr->ctime;
62ab460c 526 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
16e14375 527 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
9e6e70f8 528 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1eb5d98f 529 inode_set_iversion_raw(inode, fattr->change_attr);
cd812599 530 else
16e14375 531 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
9e6e70f8
TM		 532 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
533 inode->i_size = nfs_size_to_loff_t(fattr->size);
62ab460c 534 else
16e14375 535 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
9e6e70f8 536 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
bfe86848 537 set_nlink(inode, fattr->nlink);
62ab460c 538 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
16e14375 539 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 540 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
541 inode->i_uid = fattr->uid;
62ab460c 542 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
16e14375 543 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 544 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
545 inode->i_gid = fattr->gid;
62ab460c 546 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
16e14375 547 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
0f44da51
FL		 548 if (nfs_server_capable(inode, NFS_CAP_XATTR))
549 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
9e6e70f8
TM		 550 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
551 inode->i_blocks = fattr->du.nfs2.blocks;
552 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 553 /*
554 * report the blocks in 512byte units
555 */
556 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1da177e4 557 }
aa9c2669 558
821a868a
TM		 559 if (nfsi->cache_validity != 0)
560 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
561
aa9c2669
DQ		 562 nfs_setsecurity(inode, fattr, label);
563
1da177e4 564 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
b0c4fddc 565 nfsi->attrtimeo_timestamp = now;
1c3c07e9 566 nfsi->access_cache = RB_ROOT;
1da177e4 567
f1fe29b4 568 nfs_fscache_init_inode(inode);
ef79c097 569
1da177e4 570 unlock_new_inode(inode);
26fde4df
N		 571 } else {
572 int err = nfs_refresh_inode(inode, fattr);
573 if (err < 0) {
574 iput(inode);
575 inode = ERR_PTR(err);
576 goto out_no_inode;
577 }
578 }
1e8968c5 579 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
1da177e4 580 inode->i_sb->s_id,
1e8968c5 581 (unsigned long long)NFS_FILEID(inode),
4f1abd22 582 nfs_display_fhandle_hash(fh),
1da177e4
LT		 583 atomic_read(&inode->i_count));
584
585out:
586 return inode;
587
588out_no_inode:
03f28e3a 589 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
1da177e4
LT		 590 goto out;
591}
89d77c8f 592EXPORT_SYMBOL_GPL(nfs_fhget);
1da177e4 593
536e43d1 594#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)
1da177e4
LT		 595
596int
597nfs_setattr(struct dentry *dentry, struct iattr *attr)
598{
2b0143b5 599 struct inode *inode = d_inode(dentry);
987f8dfc 600 struct nfs_fattr *fattr;
ae57ca0f 601 int error = 0;
1da177e4 602
91d5b470
CL		 603 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
604
188b95dd
JL		 605 /* skip mode change if it's just for clearing setuid/setgid */
606 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
607 attr->ia_valid &= ~ATTR_MODE;
608
1da177e4 609 if (attr->ia_valid & ATTR_SIZE) {
08a899d5
CH		 610 BUG_ON(!S_ISREG(inode->i_mode));
611
ae57ca0f
KM		 612 error = inode_newsize_ok(inode, attr->ia_size);
613 if (error)
614 return error;
615
616 if (attr->ia_size == i_size_read(inode))
1da177e4
LT		 617 attr->ia_valid &= ~ATTR_SIZE;
618 }
619
620 /* Optimization: if the end result is no change, don't RPC */
621 attr->ia_valid &= NFS_VALID_ATTRS;
536e43d1 622 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
1da177e4
LT		 623 return 0;
624
f4ce1299
TM		 625 trace_nfs_setattr_enter(inode);
626
755c1e20 627 /* Write all dirty data */
4d346bea
TM		 628 if (S_ISREG(inode->i_mode))
629 nfs_sync_inode(inode);
987f8dfc
TM		 630
631 fattr = nfs_alloc_fattr();
ae57ca0f
KM		 632 if (fattr == NULL) {
633 error = -ENOMEM;
987f8dfc 634 goto out;
ae57ca0f
KM		 635 }
636
987f8dfc 637 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
65e4308d 638 if (error == 0)
aa9c2669 639 error = nfs_refresh_inode(inode, fattr);
987f8dfc
TM		 640 nfs_free_fattr(fattr);
641out:
f4ce1299 642 trace_nfs_setattr_exit(inode, error);
65e4308d
TM		 643 return error;
644}
ddda8e0a 645EXPORT_SYMBOL_GPL(nfs_setattr);
65e4308d 646
a3d01454
TM		 647/**
648 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
649 * @inode: inode of the file used
650 * @offset: file offset to start truncating
651 *
652 * This is a copy of the common vmtruncate, but with the locking
653 * corrected to take into account the fact that NFS requires
654 * inode->i_size to be updated under the inode->i_lock.
f044636d 655 * Note: must be called with inode->i_lock held!
a3d01454
TM		 656 */
657static int nfs_vmtruncate(struct inode * inode, loff_t offset)
658{
c08d3b0e 659 int err;
a3d01454 660
c08d3b0e 661 err = inode_newsize_ok(inode, offset);
662 if (err)
663 goto out;
a3d01454 664
c08d3b0e 665 i_size_write(inode, offset);
6edf9609
TM		 666 /* Optimisation */
667 if (offset == 0)
1c341b77
TM		 668 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA |
669 NFS_INO_DATA_INVAL_DEFER);
f6cdfa6d 670 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
c08d3b0e 671
f044636d 672 spin_unlock(&inode->i_lock);
7caef267 673 truncate_pagecache(inode, offset);
f044636d 674 spin_lock(&inode->i_lock);
c08d3b0e 675out:
676 return err;
a3d01454
TM		 677}
678
65e4308d
TM		 679/**
680 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
681 * @inode: pointer to struct inode
682 * @attr: pointer to struct iattr
16e14375 683 * @fattr: pointer to struct nfs_fattr
65e4308d
TM		 684 *
685 * Note: we do this in the *proc.c in order to ensure that
686 * it works for things like exclusive creates too.
687 */
f044636d
TM		 688void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
689 struct nfs_fattr *fattr)
65e4308d 690{
f044636d
TM		 691 /* Barrier: bump the attribute generation count. */
692 nfs_fattr_set_barrier(fattr);
693
694 spin_lock(&inode->i_lock);
695 NFS_I(inode)->attr_gencount = fattr->gencount;
6a97d02d
TM		 696 if ((attr->ia_valid & ATTR_SIZE) != 0) {
697 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
698 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
699 nfs_vmtruncate(inode, attr->ia_size);
700 }
65e4308d 701 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
6a97d02d 702 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
1da177e4 703 if ((attr->ia_valid & ATTR_MODE) != 0) {
65e4308d
TM		 704 int mode = attr->ia_mode & S_IALLUGO;
705 mode |= inode->i_mode & ~S_IALLUGO;
1da177e4
LT		 706 inode->i_mode = mode;
707 }
708 if ((attr->ia_valid & ATTR_UID) != 0)
709 inode->i_uid = attr->ia_uid;
710 if ((attr->ia_valid & ATTR_GID) != 0)
711 inode->i_gid = attr->ia_gid;
6a97d02d 712 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 713 inode->i_ctime = fattr->ctime;
6a97d02d
TM		 714 else
715 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
716 | NFS_INO_INVALID_CTIME);
6edf9609
TM		 717 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
718 | NFS_INO_INVALID_ACL);
65e4308d 719 }
6a97d02d
TM		 720 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
721 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
722 | NFS_INO_INVALID_CTIME);
723 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
e86d5a02 724 inode->i_atime = fattr->atime;
6a97d02d
TM		 725 else if (attr->ia_valid & ATTR_ATIME_SET)
726 inode->i_atime = attr->ia_atime;
727 else
728 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
729
730 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 731 inode->i_ctime = fattr->ctime;
6a97d02d
TM		 732 else
733 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
734 | NFS_INO_INVALID_CTIME);
735 }
736 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
737 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
738 | NFS_INO_INVALID_CTIME);
739 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
e86d5a02 740 inode->i_mtime = fattr->mtime;
6a97d02d
TM		 741 else if (attr->ia_valid & ATTR_MTIME_SET)
742 inode->i_mtime = attr->ia_mtime;
743 else
744 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
745
746 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 747 inode->i_ctime = fattr->ctime;
6a97d02d
TM		 748 else
749 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
750 | NFS_INO_INVALID_CTIME);
65e4308d 751 }
616c3196
JL		 752 if (fattr->valid)
753 nfs_update_inode(inode, fattr);
f044636d 754 spin_unlock(&inode->i_lock);
1da177e4 755}
ddda8e0a 756EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
1da177e4 757
1bcf4c5c 758static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
311324ad
TM		 759{
760 struct dentry *parent;
761
1bcf4c5c
TM		 762 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
763 return;
311324ad 764 parent = dget_parent(dentry);
2b0143b5 765 nfs_force_use_readdirplus(d_inode(parent));
311324ad
TM		 766 dput(parent);
767}
768
1bcf4c5c
TM		 769static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
770{
771 struct dentry *parent;
772
773 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
774 return;
775 parent = dget_parent(dentry);
776 nfs_advise_use_readdirplus(d_inode(parent));
777 dput(parent);
778}
779
311324ad
TM		 780static bool nfs_need_revalidate_inode(struct inode *inode)
781{
782 if (NFS_I(inode)->cache_validity &
783 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
784 return true;
785 if (nfs_attribute_cache_expired(inode))
786 return true;
787 return false;
788}
789
a528d35e
DH		 790int nfs_getattr(const struct path *path, struct kstat *stat,
791 u32 request_mask, unsigned int query_flags)
1da177e4 792{
a528d35e 793 struct inode *inode = d_inode(path->dentry);
9ccee940
TM		 794 struct nfs_server *server = NFS_SERVER(inode);
795 unsigned long cache_validity;
16caf5b6 796 int err = 0;
9ccee940
TM		 797 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
798 bool do_update = false;
1da177e4 799
f4ce1299 800 trace_nfs_getattr_enter(inode);
9ccee940 801
ac7cbb22
TM		 802 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
803 nfs_readdirplus_parent_cache_hit(path->dentry);
9ccee940 804 goto out_no_update;
ac7cbb22 805 }
9ccee940 806
acdc53b2 807 /* Flush out writes to the server in order to update c/mtime. */
9ccee940
TM		 808 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
809 S_ISREG(inode->i_mode)) {
79566ef0 810 err = filemap_write_and_wait(inode->i_mapping);
acdc53b2
TM		 811 if (err)
812 goto out;
28c494c5 813 }
fc33a7bb
CH		 814
815 /*
816 * We may force a getattr if the user cares about atime.
817 *
818 * Note that we only have to check the vfsmount flags here:
819 * - NFS always sets S_NOATIME by so checking it would give a
820 * bogus result
1751e8a6 821 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
fc33a7bb
CH		 822 * no point in checking those.
823 */
a528d35e
DH		 824 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
825 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
9ccee940
TM		 826 request_mask &= ~STATX_ATIME;
827
828 /* Is the user requesting attributes that might need revalidation? */
829 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
830 STATX_MTIME|STATX_UID|STATX_GID|
831 STATX_SIZE|STATX_BLOCKS)))
832 goto out_no_revalidate;
833
834 /* Check whether the cached attributes are stale */
835 do_update |= force_sync || nfs_attribute_cache_expired(inode);
836 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
837 do_update |= cache_validity &
838 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
839 if (request_mask & STATX_ATIME)
840 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
841 if (request_mask & (STATX_CTIME|STATX_MTIME))
842 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
3a39e778
ZB		 843 if (request_mask & STATX_BLOCKS)
844 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
9ccee940
TM		 845 if (do_update) {
846 /* Update the attribute cache */
59b86d85
HT		 847 if (!(server->flags & NFS_MOUNT_NOAC))
848 nfs_readdirplus_parent_cache_miss(path->dentry);
849 else
850 nfs_readdirplus_parent_cache_hit(path->dentry);
311324ad 851 err = __nfs_revalidate_inode(server, inode);
9ccee940
TM		 852 if (err)
853 goto out;
1bcf4c5c 854 } else
a528d35e 855 nfs_readdirplus_parent_cache_hit(path->dentry);
9ccee940
TM		 856out_no_revalidate:
857 /* Only return attributes that were revalidated. */
858 stat->result_mask &= request_mask;
859out_no_update:
0d56a451 860 generic_fillattr(&init_user_ns, inode, stat);
9ccee940
TM		 861 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
862 if (S_ISDIR(inode->i_mode))
863 stat->blksize = NFS_SERVER(inode)->dtsize;
acdc53b2 864out:
f4ce1299 865 trace_nfs_getattr_exit(inode, err);
1da177e4
LT		 866 return err;
867}
ddda8e0a 868EXPORT_SYMBOL_GPL(nfs_getattr);
1da177e4 869
f11ac8db
TM		 870static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
871{
2f62b5aa 872 refcount_set(&l_ctx->count, 1);
d51fdb87 873 l_ctx->lockowner = current->files;
f11ac8db 874 INIT_LIST_HEAD(&l_ctx->list);
210c7c17 875 atomic_set(&l_ctx->io_count, 0);
f11ac8db
TM		 876}
877
878static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
879{
1db97eaa 880 struct nfs_lock_context *pos;
f11ac8db 881
1db97eaa 882 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
d51fdb87 883 if (pos->lockowner != current->files)
f11ac8db 884 continue;
1db97eaa
TM		 885 if (refcount_inc_not_zero(&pos->count))
886 return pos;
887 }
f11ac8db
TM		 888 return NULL;
889}
890
891struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
892{
893 struct nfs_lock_context *res, *new = NULL;
2b0143b5 894 struct inode *inode = d_inode(ctx->dentry);
f11ac8db 895
1db97eaa 896 rcu_read_lock();
f11ac8db 897 res = __nfs_find_lock_context(ctx);
1db97eaa 898 rcu_read_unlock();
f11ac8db 899 if (res == NULL) {
f11ac8db
TM		 900 new = kmalloc(sizeof(*new), GFP_KERNEL);
901 if (new == NULL)
b3c54de6 902 return ERR_PTR(-ENOMEM);
f11ac8db
TM		 903 nfs_init_lock_context(new);
904 spin_lock(&inode->i_lock);
905 res = __nfs_find_lock_context(ctx);
906 if (res == NULL) {
15494511
TM		 907 new->open_context = get_nfs_open_context(ctx);
908 if (new->open_context) {
909 list_add_tail_rcu(&new->list,
910 &ctx->lock_context.list);
911 res = new;
912 new = NULL;
913 } else
914 res = ERR_PTR(-EBADF);
f11ac8db 915 }
1db97eaa
TM		 916 spin_unlock(&inode->i_lock);
917 kfree(new);
f11ac8db 918 }
f11ac8db
TM		 919 return res;
920}
1c6dcbe5 921EXPORT_SYMBOL_GPL(nfs_get_lock_context);
f11ac8db
TM		 922
923void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
924{
925 struct nfs_open_context *ctx = l_ctx->open_context;
2b0143b5 926 struct inode *inode = d_inode(ctx->dentry);
f11ac8db 927
2f62b5aa 928 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
f11ac8db 929 return;
1db97eaa 930 list_del_rcu(&l_ctx->list);
f11ac8db 931 spin_unlock(&inode->i_lock);
15494511 932 put_nfs_open_context(ctx);
1db97eaa 933 kfree_rcu(l_ctx, rcu_head);
f11ac8db 934}
1c6dcbe5 935EXPORT_SYMBOL_GPL(nfs_put_lock_context);
f11ac8db 936
7fe5c398
TM		 937/**
938 * nfs_close_context - Common close_context() routine NFSv2/v3
939 * @ctx: pointer to context
940 * @is_sync: is this a synchronous close
941 *
5cf9d706
TM		 942 * Ensure that the attributes are up to date if we're mounted
943 * with close-to-open semantics and we have cached data that will
944 * need to be revalidated on open.
7fe5c398
TM		 945 */
946void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
947{
5cf9d706 948 struct nfs_inode *nfsi;
7fe5c398
TM		 949 struct inode *inode;
950 struct nfs_server *server;
951
952 if (!(ctx->mode & FMODE_WRITE))
953 return;
954 if (!is_sync)
955 return;
2b0143b5 956 inode = d_inode(ctx->dentry);
58ff4184
TM		 957 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
958 return;
5cf9d706
TM		 959 nfsi = NFS_I(inode);
960 if (inode->i_mapping->nrpages == 0)
961 return;
962 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
963 return;
964 if (!list_empty(&nfsi->open_files))
7fe5c398
TM		 965 return;
966 server = NFS_SERVER(inode);
967 if (server->flags & NFS_MOUNT_NOCTO)
968 return;
969 nfs_revalidate_inode(server, inode);
970}
ddda8e0a 971EXPORT_SYMBOL_GPL(nfs_close_context);
7fe5c398 972
532d4def
N		 973struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
974 fmode_t f_mode,
975 struct file *filp)
1da177e4
LT		 976{
977 struct nfs_open_context *ctx;
978
f52720ca 979 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
1d179d6b 980 if (!ctx)
5ede7b1c 981 return ERR_PTR(-ENOMEM);
5ede7b1c
AV		 982 nfs_sb_active(dentry->d_sb);
983 ctx->dentry = dget(dentry);
1d179d6b
TM		 984 if (filp)
985 ctx->cred = get_cred(filp->f_cred);
986 else
987 ctx->cred = get_current_cred();
ddf529ee 988 ctx->ll_cred = NULL;
5ede7b1c
AV		 989 ctx->state = NULL;
990 ctx->mode = f_mode;
991 ctx->flags = 0;
992 ctx->error = 0;
532d4def 993 ctx->flock_owner = (fl_owner_t)filp;
5ede7b1c
AV		 994 nfs_init_lock_context(&ctx->lock_context);
995 ctx->lock_context.open_context = ctx;
996 INIT_LIST_HEAD(&ctx->list);
82be417a 997 ctx->mdsthreshold = NULL;
1da177e4
LT		 998 return ctx;
999}
89d77c8f 1000EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1da177e4
LT		 1001
1002struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1003{
0de43976
TM		 1004 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1005 return ctx;
1006 return NULL;
1da177e4 1007}
89d77c8f 1008EXPORT_SYMBOL_GPL(get_nfs_open_context);
1da177e4 1009
7fe5c398 1010static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1da177e4 1011{
2b0143b5 1012 struct inode *inode = d_inode(ctx->dentry);
3d4ff43d 1013 struct super_block *sb = ctx->dentry->d_sb;
3bec63db 1014
0de43976
TM		 1015 if (!refcount_dec_and_test(&ctx->lock_context.count))
1016 return;
5c78f58e 1017 if (!list_empty(&ctx->list)) {
0de43976
TM		 1018 spin_lock(&inode->i_lock);
1019 list_del_rcu(&ctx->list);
ef84303e 1020 spin_unlock(&inode->i_lock);
0de43976 1021 }
5c78f58e
TM		 1022 if (inode != NULL)
1023 NFS_PROTO(inode)->close_context(ctx, is_sync);
a52458b4 1024 put_cred(ctx->cred);
3d4ff43d 1025 dput(ctx->dentry);
322b2b90 1026 nfs_sb_deactive(sb);
ddf529ee 1027 put_rpccred(ctx->ll_cred);
82be417a 1028 kfree(ctx->mdsthreshold);
0de43976 1029 kfree_rcu(ctx, rcu_head);
3bec63db
TM		 1030}
1031
a49c3c77
TM		 1032void put_nfs_open_context(struct nfs_open_context *ctx)
1033{
1034 __put_nfs_open_context(ctx, 0);
1035}
89d77c8f 1036EXPORT_SYMBOL_GPL(put_nfs_open_context);
a49c3c77 1037
4eae5014
TM		 1038static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1039{
1040 __put_nfs_open_context(ctx, 1);
1041}
1042
1da177e4
LT		 1043/*
1044 * Ensure that mmap has a recent RPC credential for use when writing out
1045 * shared pages
1046 */
c45ffdd2 1047void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1da177e4 1048{
2b0143b5 1049 struct inode *inode = d_inode(ctx->dentry);
1da177e4
LT		 1050 struct nfs_inode *nfsi = NFS_I(inode);
1051
1da177e4 1052 spin_lock(&inode->i_lock);
1c341b77
TM		 1053 if (list_empty(&nfsi->open_files) &&
1054 (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER))
1055 nfsi->cache_validity |= NFS_INO_INVALID_DATA |
1056 NFS_INO_REVAL_FORCED;
0de43976 1057 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1da177e4
LT		 1058 spin_unlock(&inode->i_lock);
1059}
c45ffdd2
TM		 1060EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1061
1062void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1063{
1064 filp->private_data = get_nfs_open_context(ctx);
1065 if (list_empty(&ctx->list))
1066 nfs_inode_attach_open_context(ctx);
1067}
89d77c8f 1068EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1da177e4 1069
d530838b
TM		 1070/*
1071 * Given an inode, search for an open context with the desired characteristics
1072 */
a52458b4 1073struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1da177e4
LT		 1074{
1075 struct nfs_inode *nfsi = NFS_I(inode);
1076 struct nfs_open_context *pos, *ctx = NULL;
1077
0de43976
TM		 1078 rcu_read_lock();
1079 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
65f51603 1080 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
d530838b 1081 continue;
1544fa0f
TM		 1082 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1083 continue;
1084 ctx = get_nfs_open_context(pos);
0de43976
TM		 1085 if (ctx)
1086 break;
1da177e4 1087 }
0de43976 1088 rcu_read_unlock();
1da177e4
LT		 1089 return ctx;
1090}
1091
aff8d8dc 1092void nfs_file_clear_open_context(struct file *filp)
1da177e4 1093{
cd3758e3 1094 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1da177e4
LT		 1095
1096 if (ctx) {
2b0143b5 1097 struct inode *inode = d_inode(ctx->dentry);
c45ffdd2 1098
0bcbf039
PT		 1099 /*
1100 * We fatal error on write before. Try to writeback
1101 * every page again.
1102 */
1103 if (ctx->error < 0)
1104 invalidate_inode_pages2(inode->i_mapping);
1da177e4 1105 filp->private_data = NULL;
4eae5014 1106 put_nfs_open_context_sync(ctx);
1da177e4
LT		 1107 }
1108}
1109
1110/*
1111 * These allocate and release file read/write context information.
1112 */
1113int nfs_open(struct inode *inode, struct file *filp)
1114{
1115 struct nfs_open_context *ctx;
1da177e4 1116
532d4def 1117 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
5ede7b1c
AV		 1118 if (IS_ERR(ctx))
1119 return PTR_ERR(ctx);
1da177e4
LT		 1120 nfs_file_set_open_context(filp, ctx);
1121 put_nfs_open_context(ctx);
f1fe29b4 1122 nfs_fscache_open_file(inode, filp);
1da177e4
LT		 1123 return 0;
1124}
44942b4e 1125EXPORT_SYMBOL_GPL(nfs_open);
1da177e4 1126
1da177e4
LT		 1127/*
1128 * This function is called whenever some part of NFS notices that
1129 * the cached attributes have to be refreshed.
1130 */
1131int
1132__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1133{
1134 int status = -ESTALE;
1775fd3e 1135 struct nfs4_label *label = NULL;
a3cba2aa 1136 struct nfs_fattr *fattr = NULL;
1da177e4 1137 struct nfs_inode *nfsi = NFS_I(inode);
1da177e4 1138
1e8968c5
NV		 1139 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1140 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1da177e4 1141
f4ce1299
TM		 1142 trace_nfs_revalidate_inode_enter(inode);
1143
85233a7a 1144 if (is_bad_inode(inode))
691beb13 1145 goto out;
1da177e4 1146 if (NFS_STALE(inode))
412d582e 1147 goto out;
7fdc49c4 1148
ac46bd37
TM		 1149 /* pNFS: Attributes aren't updated until we layoutcommit */
1150 if (S_ISREG(inode->i_mode)) {
1151 status = pnfs_sync_inode(inode, false);
1152 if (status)
1153 goto out;
1154 }
1155
a3cba2aa
TM		 1156 status = -ENOMEM;
1157 fattr = nfs_alloc_fattr();
1158 if (fattr == NULL)
1159 goto out;
1160
691beb13 1161 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
14c43f76
DQ		 1162
1163 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1164 if (IS_ERR(label)) {
1165 status = PTR_ERR(label);
1166 goto out;
1167 }
1168
a841b54d
TM		 1169 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1170 label, inode);
1da177e4 1171 if (status != 0) {
1e8968c5 1172 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1da177e4 1173 inode->i_sb->s_id,
1e8968c5 1174 (unsigned long long)NFS_FILEID(inode), status);
c74dfe97
TM		 1175 switch (status) {
1176 case -ETIMEDOUT:
1177 /* A soft timeout occurred. Use cached information? */
1178 if (server->flags & NFS_MOUNT_SOFTREVAL)
1179 status = 0;
1180 break;
1181 case -ESTALE:
1da177e4 1182 if (!S_ISDIR(inode->i_mode))
93ce4af7
TM		 1183 nfs_set_inode_stale(inode);
1184 else
1185 nfs_zap_caches(inode);
1da177e4 1186 }
14c43f76 1187 goto err_out;
1da177e4
LT		 1188 }
1189
a3cba2aa 1190 status = nfs_refresh_inode(inode, fattr);
1da177e4 1191 if (status) {
1e8968c5 1192 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1da177e4 1193 inode->i_sb->s_id,
1e8968c5 1194 (unsigned long long)NFS_FILEID(inode), status);
14c43f76 1195 goto err_out;
1da177e4 1196 }
55296809 1197
24aa1fe6 1198 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
ada70d94 1199 nfs_zap_acl_cache(inode);
55296809 1200
3da580aa
JL		 1201 nfs_setsecurity(inode, fattr, label);
1202
1e8968c5 1203 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1da177e4 1204 inode->i_sb->s_id,
1e8968c5 1205 (unsigned long long)NFS_FILEID(inode));
1da177e4 1206
14c43f76
DQ		 1207err_out:
1208 nfs4_label_free(label);
1209out:
a3cba2aa 1210 nfs_free_fattr(fattr);
f4ce1299 1211 trace_nfs_revalidate_inode_exit(inode, status);
1da177e4
LT		 1212 return status;
1213}
1214
43f291cd 1215int nfs_attribute_cache_expired(struct inode *inode)
d7cf8dd0 1216{
b4d2314b 1217 if (nfs_have_delegated_attributes(inode))
1da177e4 1218 return 0;
d7cf8dd0 1219 return nfs_attribute_timeout(inode);
1da177e4
LT		 1220}
1221
1222/**
1223 * nfs_revalidate_inode - Revalidate the inode attributes
302fad7b
TM		 1224 * @server: pointer to nfs_server struct
1225 * @inode: pointer to inode struct
1da177e4
LT		 1226 *
1227 * Updates inode attribute information by retrieving the data from the server.
1228 */
1229int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1230{
311324ad 1231 if (!nfs_need_revalidate_inode(inode))
1da177e4
LT		 1232 return NFS_STALE(inode) ? -ESTALE : 0;
1233 return __nfs_revalidate_inode(server, inode);
1234}
1c606fb7 1235EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1da177e4 1236
1cda707d 1237static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
717d44e8 1238{
f8806c84
TM		 1239 int ret;
1240
717d44e8 1241 if (mapping->nrpages != 0) {
f8806c84
TM		 1242 if (S_ISREG(inode->i_mode)) {
1243 ret = nfs_sync_mapping(mapping);
1244 if (ret < 0)
1245 return ret;
1246 }
1247 ret = invalidate_inode_pages2(mapping);
717d44e8
TM		 1248 if (ret < 0)
1249 return ret;
1250 }
717d44e8 1251 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
de242c0b 1252 nfs_fscache_wait_on_invalidate(inode);
f4ce1299 1253
1e8968c5
NV		 1254 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1255 inode->i_sb->s_id,
1256 (unsigned long long)NFS_FILEID(inode));
717d44e8
TM		 1257 return 0;
1258}
1259
1cd9cb05 1260bool nfs_mapping_need_revalidate_inode(struct inode *inode)
b4b1eadf 1261{
61540bf6
TM		 1262 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1263 NFS_STALE(inode);
b4b1eadf
TM		 1264}
1265
0d0def49
AV		 1266int nfs_revalidate_mapping_rcu(struct inode *inode)
1267{
1268 struct nfs_inode *nfsi = NFS_I(inode);
1269 unsigned long *bitlock = &nfsi->flags;
1270 int ret = 0;
1271
1272 if (IS_SWAPFILE(inode))
1273 goto out;
1274 if (nfs_mapping_need_revalidate_inode(inode)) {
1275 ret = -ECHILD;
1276 goto out;
1277 }
1278 spin_lock(&inode->i_lock);
1279 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1280 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1281 ret = -ECHILD;
1282 spin_unlock(&inode->i_lock);
1283out:
1284 return ret;
1285}
1286
717d44e8 1287/**
be527494 1288 * nfs_revalidate_mapping - Revalidate the pagecache
302fad7b
TM		 1289 * @inode: pointer to host inode
1290 * @mapping: pointer to mapping
717d44e8 1291 */
be527494
TM		 1292int nfs_revalidate_mapping(struct inode *inode,
1293 struct address_space *mapping)
717d44e8
TM		 1294{
1295 struct nfs_inode *nfsi = NFS_I(inode);
d529ef83 1296 unsigned long *bitlock = &nfsi->flags;
717d44e8 1297 int ret = 0;
dc59250c 1298
29418aa4
MG		 1299 /* swapfiles are not supposed to be shared. */
1300 if (IS_SWAPFILE(inode))
1301 goto out;
1302
b4b1eadf 1303 if (nfs_mapping_need_revalidate_inode(inode)) {
717d44e8
TM		 1304 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1305 if (ret < 0)
1306 goto out;
7d52e862 1307 }
d529ef83
JL		 1308
1309 /*
1310 * We must clear NFS_INO_INVALID_DATA first to ensure that
1311 * invalidations that come in while we're shooting down the mappings
1312 * are respected. But, that leaves a race window where one revalidator
1313 * can clear the flag, and then another checks it before the mapping
1314 * gets invalidated. Fix that by serializing access to this part of
1315 * the function.
1316 *
1317 * At the same time, we need to allow other tasks to see whether we
1318 * might be in the middle of invalidating the pages, so we only set
1319 * the bit lock here if it looks like we're going to be doing that.
1320 */
1321 for (;;) {
74316201
N		 1322 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1323 nfs_wait_bit_killable, TASK_KILLABLE);
d529ef83
JL		 1324 if (ret)
1325 goto out;
17dfeb91
TM		 1326 spin_lock(&inode->i_lock);
1327 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1328 spin_unlock(&inode->i_lock);
1329 continue;
1330 }
1331 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
d529ef83 1332 break;
d529ef83 1333 spin_unlock(&inode->i_lock);
17dfeb91 1334 goto out;
f4ce1299
TM		 1335 }
1336
17dfeb91 1337 set_bit(NFS_INO_INVALIDATING, bitlock);
4db72b40 1338 smp_wmb();
1c341b77
TM		 1339 nfsi->cache_validity &= ~(NFS_INO_INVALID_DATA|
1340 NFS_INO_DATA_INVAL_DEFER);
17dfeb91
TM		 1341 spin_unlock(&inode->i_lock);
1342 trace_nfs_invalidate_mapping_enter(inode);
be527494 1343 ret = nfs_invalidate_mapping(inode, mapping);
17dfeb91
TM		 1344 trace_nfs_invalidate_mapping_exit(inode, ret);
1345
d529ef83 1346 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
4e857c58 1347 smp_mb__after_atomic();
d529ef83 1348 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
cd9ae2b6 1349out:
44b11874 1350 return ret;
7d52e862
TM		 1351}
1352
ca0daa27 1353static bool nfs_file_has_writers(struct nfs_inode *nfsi)
874f9463 1354{
ca0daa27
TM		 1355 struct inode *inode = &nfsi->vfs_inode;
1356
ca0daa27
TM		 1357 if (!S_ISREG(inode->i_mode))
1358 return false;
1359 if (list_empty(&nfsi->open_files))
1360 return false;
6ba0c4e5 1361 return inode_is_open_for_write(inode);
874f9463
TM		 1362}
1363
651b0e70 1364static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
874f9463 1365{
651b0e70 1366 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
874f9463
TM		 1367}
1368
783b194c 1369static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
a895b4a1 1370{
e86d5a02 1371 struct timespec64 ts;
95582b00 1372
9e6e70f8
TM		 1373 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1374 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
c472c07b 1375 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1eb5d98f 1376 inode_set_iversion_raw(inode, fattr->change_attr);
70ca8852 1377 if (S_ISDIR(inode->i_mode))
6edf9609 1378 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
0f44da51
FL		 1379 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1380 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
70ca8852 1381 }
a895b4a1 1382 /* If we have atomic WCC data, we may update some attributes */
e86d5a02 1383 ts = inode->i_ctime;
9e6e70f8
TM		 1384 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1385 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02
TM		 1386 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1387 inode->i_ctime = fattr->ctime;
27dc1cd3 1388 }
9e6e70f8 1389
e86d5a02 1390 ts = inode->i_mtime;
9e6e70f8
TM		 1391 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1392 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
e86d5a02
TM		 1393 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1394 inode->i_mtime = fattr->mtime;
27dc1cd3 1395 if (S_ISDIR(inode->i_mode))
6edf9609 1396 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
a895b4a1 1397 }
9e6e70f8
TM		 1398 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1399 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1400 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
a6b6d5b8 1401 && !nfs_have_writebacks(inode)) {
27dc1cd3 1402 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
27dc1cd3 1403 }
a895b4a1
TM		 1404}
1405
1da177e4 1406/**
33801147 1407 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
302fad7b
TM		 1408 * @inode: pointer to inode
1409 * @fattr: updated attributes
1da177e4
LT		 1410 *
1411 * Verifies the attribute cache. If we have just changed the attributes,
1412 * so that fattr carries weak cache consistency data, then it may
1413 * also update the ctime/mtime/change_attribute.
1414 */
33801147 1415static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1da177e4
LT		 1416{
1417 struct nfs_inode *nfsi = NFS_I(inode);
1418 loff_t cur_size, new_isize;
2a3f5fd4 1419 unsigned long invalid = 0;
e86d5a02 1420 struct timespec64 ts;
dc59250c 1421
4ebe83af 1422 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
01da47bd 1423 return 0;
4ebe83af 1424
eb3d8f42
TM		 1425 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1426 /* Only a mounted-on-fileid? Just exit */
1427 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1428 return 0;
ca62b9c3 1429 /* Has the inode gone and changed behind our back? */
eb3d8f42 1430 } else if (nfsi->fileid != fattr->fileid) {
7e10cc25
TM		 1431 /* Is this perhaps the mounted-on fileid? */
1432 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1433 nfsi->fileid == fattr->mounted_on_fileid)
1434 return 0;
cc89684c 1435 return -ESTALE;
7e10cc25 1436 }
9e6e70f8 1437 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
cc89684c 1438 return -ESTALE;
ca62b9c3 1439
7e10cc25 1440
651b0e70 1441 if (!nfs_file_has_buffered_writers(nfsi)) {
ca0daa27 1442 /* Verify a few of the more important attributes */
c472c07b 1443 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
16e14375
TM		 1444 invalid |= NFS_INO_INVALID_CHANGE
1445 | NFS_INO_REVAL_PAGECACHE;
1da177e4 1446
e86d5a02
TM		 1447 ts = inode->i_mtime;
1448 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
16e14375 1449 invalid |= NFS_INO_INVALID_MTIME;
ca62b9c3 1450
e86d5a02
TM		 1451 ts = inode->i_ctime;
1452 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
16e14375 1453 invalid |= NFS_INO_INVALID_CTIME;
ca0daa27
TM		 1454
1455 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1456 cur_size = i_size_read(inode);
1457 new_isize = nfs_size_to_loff_t(fattr->size);
1458 if (cur_size != new_isize)
16e14375
TM		 1459 invalid |= NFS_INO_INVALID_SIZE
1460 | NFS_INO_REVAL_PAGECACHE;
ca0daa27 1461 }
9e6e70f8 1462 }
1da177e4
LT		 1463
1464 /* Have any file permissions changed? */
9e6e70f8 1465 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
16e14375
TM		 1466 invalid |= NFS_INO_INVALID_ACCESS
1467 | NFS_INO_INVALID_ACL
1468 | NFS_INO_INVALID_OTHER;
9ff593c4 1469 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
16e14375
TM		 1470 invalid |= NFS_INO_INVALID_ACCESS
1471 | NFS_INO_INVALID_ACL
1472 | NFS_INO_INVALID_OTHER;
9ff593c4 1473 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
16e14375
TM		 1474 invalid |= NFS_INO_INVALID_ACCESS
1475 | NFS_INO_INVALID_ACL
1476 | NFS_INO_INVALID_OTHER;
1da177e4
LT		 1477
1478 /* Has the link count changed? */
9e6e70f8 1479 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
16e14375 1480 invalid |= NFS_INO_INVALID_OTHER;
1da177e4 1481
e86d5a02
TM		 1482 ts = inode->i_atime;
1483 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
2a3f5fd4
TM		 1484 invalid |= NFS_INO_INVALID_ATIME;
1485
1486 if (invalid != 0)
4ebe83af 1487 nfs_set_cache_invalid(inode, invalid);
1da177e4 1488
33801147 1489 nfsi->read_cache_jiffies = fattr->time_start;
1da177e4
LT		 1490 return 0;
1491}
1492
ae05f269 1493static atomic_long_t nfs_attr_generation_counter;
4704f0e2
TM		 1494
1495static unsigned long nfs_read_attr_generation_counter(void)
1496{
ae05f269 1497 return atomic_long_read(&nfs_attr_generation_counter);
4704f0e2
TM		 1498}
1499
1500unsigned long nfs_inc_attr_generation_counter(void)
1501{
ae05f269 1502 return atomic_long_inc_return(&nfs_attr_generation_counter);
4704f0e2 1503}
3235b403 1504EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
4704f0e2
TM		 1505
1506void nfs_fattr_init(struct nfs_fattr *fattr)
1507{
1508 fattr->valid = 0;
1509 fattr->time_start = jiffies;
1510 fattr->gencount = nfs_inc_attr_generation_counter();
6926afd1
TM		 1511 fattr->owner_name = NULL;
1512 fattr->group_name = NULL;
4704f0e2 1513}
ddda8e0a 1514EXPORT_SYMBOL_GPL(nfs_fattr_init);
4704f0e2 1515
140e049c
TM		 1516/**
1517 * nfs_fattr_set_barrier
1518 * @fattr: attributes
1519 *
1520 * Used to set a barrier after an attribute was updated. This
1521 * barrier ensures that older attributes from RPC calls that may
1522 * have raced with our update cannot clobber these new values.
1523 * Note that you are still responsible for ensuring that other
1524 * operations which change the attribute on the server do not
1525 * collide.
1526 */
1527void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1528{
1529 fattr->gencount = nfs_inc_attr_generation_counter();
1530}
1531
2d36bfde
TM		 1532struct nfs_fattr *nfs_alloc_fattr(void)
1533{
1534 struct nfs_fattr *fattr;
1535
1536 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1537 if (fattr != NULL)
1538 nfs_fattr_init(fattr);
1539 return fattr;
1540}
ddda8e0a 1541EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
2d36bfde
TM		 1542
1543struct nfs_fh *nfs_alloc_fhandle(void)
1544{
1545 struct nfs_fh *fh;
1546
1547 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1548 if (fh != NULL)
1549 fh->size = 0;
1550 return fh;
1551}
ddda8e0a 1552EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
2d36bfde 1553
e27d359e 1554#ifdef NFS_DEBUG
d8e0539e
WAA		 1555/*
1556 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1557 * in the same way that wireshark does
1558 *
1559 * @fh: file handle
1560 *
1561 * For debugging only.
1562 */
1563u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1564{
1565 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1566 * not on the result */
1264a2f0 1567 return nfs_fhandle_hash(fh);
d8e0539e 1568}
9e6ee76d 1569EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
d8e0539e
WAA		 1570
1571/*
20d27e92
CL		 1572 * _nfs_display_fhandle - display an NFS file handle on the console
1573 *
1574 * @fh: file handle to display
1575 * @caption: display caption
1576 *
1577 * For debugging only.
1578 */
20d27e92
CL		 1579void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1580{
1581 unsigned short i;
1582
fa68a1ba 1583 if (fh == NULL || fh->size == 0) {
20d27e92
CL		 1584 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1585 return;
1586 }
1587
d8e0539e
WAA		 1588 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1589 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
20d27e92
CL		 1590 for (i = 0; i < fh->size; i += 16) {
1591 __be32 *pos = (__be32 *)&fh->data[i];
1592
1593 switch ((fh->size - i - 1) >> 2) {
1594 case 0:
1595 printk(KERN_DEFAULT " %08x\n",
1596 be32_to_cpup(pos));
1597 break;
1598 case 1:
1599 printk(KERN_DEFAULT " %08x %08x\n",
1600 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1601 break;
1602 case 2:
1603 printk(KERN_DEFAULT " %08x %08x %08x\n",
1604 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1605 be32_to_cpup(pos + 2));
1606 break;
1607 default:
1608 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1609 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1610 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1611 }
1612 }
1613}
9e6ee76d 1614EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
20d27e92
CL		 1615#endif
1616
a10ad176
TM		 1617/**
1618 * nfs_inode_attrs_need_update - check if the inode attributes need updating
302fad7b
TM		 1619 * @inode: pointer to inode
1620 * @fattr: attributes
a10ad176
TM		 1621 *
1622 * Attempt to divine whether or not an RPC call reply carrying stale
1623 * attributes got scheduled after another call carrying updated ones.
1624 *
1625 * To do so, the function first assumes that a more recent ctime means
1626 * that the attributes in fattr are newer, however it also attempt to
1627 * catch the case where ctime either didn't change, or went backwards
1628 * (if someone reset the clock on the server) by looking at whether
1629 * or not this RPC call was started after the inode was last updated.
4704f0e2 1630 * Note also the check for wraparound of 'attr_gencount'
a10ad176
TM		 1631 *
1632 * The function returns 'true' if it thinks the attributes in 'fattr' are
1633 * more recent than the ones cached in the inode.
1634 *
1635 */
1636static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1637{
1638 const struct nfs_inode *nfsi = NFS_I(inode);
1639
4704f0e2 1640 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
4704f0e2 1641 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
a10ad176
TM		 1642}
1643
1644static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1645{
f4ce1299
TM		 1646 int ret;
1647
1648 trace_nfs_refresh_inode_enter(inode);
1649
a10ad176 1650 if (nfs_inode_attrs_need_update(inode, fattr))
f4ce1299
TM		 1651 ret = nfs_update_inode(inode, fattr);
1652 else
1653 ret = nfs_check_inode_attributes(inode, fattr);
1654
1655 trace_nfs_refresh_inode_exit(inode, ret);
1656 return ret;
870a5be8
TM		 1657}
1658
33801147
TM		 1659/**
1660 * nfs_refresh_inode - try to update the inode attribute cache
302fad7b
TM		 1661 * @inode: pointer to inode
1662 * @fattr: updated attributes
33801147
TM		 1663 *
1664 * Check that an RPC call that returned attributes has not overlapped with
1665 * other recent updates of the inode metadata, then decide whether it is
1666 * safe to do a full update of the inode attributes, or whether just to
1667 * call nfs_check_inode_attributes.
1668 */
1669int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1670{
33801147
TM		 1671 int status;
1672
1673 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1674 return 0;
1675 spin_lock(&inode->i_lock);
870a5be8 1676 status = nfs_refresh_inode_locked(inode, fattr);
33801147 1677 spin_unlock(&inode->i_lock);
ef79c097 1678
33801147
TM		 1679 return status;
1680}
ddda8e0a 1681EXPORT_SYMBOL_GPL(nfs_refresh_inode);
33801147 1682
16e14375
TM		 1683static int nfs_post_op_update_inode_locked(struct inode *inode,
1684 struct nfs_fattr *fattr, unsigned int invalid)
d65f557f 1685{
6edf9609
TM		 1686 if (S_ISDIR(inode->i_mode))
1687 invalid |= NFS_INO_INVALID_DATA;
1688 nfs_set_cache_invalid(inode, invalid);
d65f557f
TM		 1689 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1690 return 0;
1691 return nfs_refresh_inode_locked(inode, fattr);
1692}
1693
decf491f
TM		 1694/**
1695 * nfs_post_op_update_inode - try to update the inode attribute cache
302fad7b
TM		 1696 * @inode: pointer to inode
1697 * @fattr: updated attributes
decf491f
TM		 1698 *
1699 * After an operation that has changed the inode metadata, mark the
1700 * attribute cache as being invalid, then try to update it.
f551e44f
CL		 1701 *
1702 * NB: if the server didn't return any post op attributes, this
1703 * function will force the retrieval of attributes before the next
1704 * NFS request. Thus it should be used only for operations that
1705 * are expected to change one or more attributes, to avoid
1706 * unnecessary NFS requests and trips through nfs_update_inode().
decf491f
TM		 1707 */
1708int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1709{
d65f557f 1710 int status;
decf491f 1711
7668fdbe 1712 spin_lock(&inode->i_lock);
92d64e47 1713 nfs_fattr_set_barrier(fattr);
16e14375
TM		 1714 status = nfs_post_op_update_inode_locked(inode, fattr,
1715 NFS_INO_INVALID_CHANGE
d554168f
TM		 1716 | NFS_INO_INVALID_CTIME
1717 | NFS_INO_REVAL_FORCED);
7668fdbe 1718 spin_unlock(&inode->i_lock);
aa9c2669 1719
870a5be8 1720 return status;
decf491f 1721}
1c606fb7 1722EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
decf491f 1723
70ca8852 1724/**
a08a8cd3 1725 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
302fad7b
TM		 1726 * @inode: pointer to inode
1727 * @fattr: updated attributes
70ca8852
TM		 1728 *
1729 * After an operation that has changed the inode metadata, mark the
1730 * attribute cache as being invalid, then try to update it. Fake up
1731 * weak cache consistency data, if none exist.
1732 *
1733 * This function is mainly designed to be used by the ->write_done() functions.
1734 */
a08a8cd3 1735int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
70ca8852 1736{
d65f557f
TM		 1737 int status;
1738
d65f557f
TM		 1739 /* Don't do a WCC update if these attributes are already stale */
1740 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1741 !nfs_inode_attrs_need_update(inode, fattr)) {
9e6e70f8
TM		 1742 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1743 | NFS_ATTR_FATTR_PRESIZE
1744 | NFS_ATTR_FATTR_PREMTIME
1745 | NFS_ATTR_FATTR_PRECTIME);
d65f557f
TM		 1746 goto out_noforce;
1747 }
9e6e70f8
TM		 1748 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1749 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1eb5d98f 1750 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
9e6e70f8 1751 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
70ca8852 1752 }
9e6e70f8
TM		 1753 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1754 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
e86d5a02 1755 fattr->pre_ctime = inode->i_ctime;
9e6e70f8
TM		 1756 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1757 }
1758 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1759 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
e86d5a02 1760 fattr->pre_mtime = inode->i_mtime;
9e6e70f8
TM		 1761 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1762 }
1763 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1764 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
a3d01454 1765 fattr->pre_size = i_size_read(inode);
9e6e70f8 1766 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
70ca8852 1767 }
d65f557f 1768out_noforce:
16e14375
TM		 1769 status = nfs_post_op_update_inode_locked(inode, fattr,
1770 NFS_INO_INVALID_CHANGE
1771 | NFS_INO_INVALID_CTIME
3a39e778
ZB		 1772 | NFS_INO_INVALID_MTIME
1773 | NFS_INO_INVALID_BLOCKS);
a08a8cd3
TM		 1774 return status;
1775}
1776
1777/**
1778 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
302fad7b
TM		 1779 * @inode: pointer to inode
1780 * @fattr: updated attributes
a08a8cd3
TM		 1781 *
1782 * After an operation that has changed the inode metadata, mark the
1783 * attribute cache as being invalid, then try to update it. Fake up
1784 * weak cache consistency data, if none exist.
1785 *
1786 * This function is mainly designed to be used by the ->write_done() functions.
1787 */
1788int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1789{
1790 int status;
1791
1792 spin_lock(&inode->i_lock);
8f8ba1d7 1793 nfs_fattr_set_barrier(fattr);
a08a8cd3 1794 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
d65f557f
TM		 1795 spin_unlock(&inode->i_lock);
1796 return status;
70ca8852 1797}
ddda8e0a 1798EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
70ca8852 1799
ea96d1ec 1800
1da177e4
LT		 1801/*
1802 * Many nfs protocol calls return the new file attributes after
1803 * an operation. Here we update the inode to reflect the state
1804 * of the server's inode.
1805 *
1806 * This is a bit tricky because we have to make sure all dirty pages
1807 * have been sent off to the server before calling invalidate_inode_pages.
1808 * To make sure no other process adds more write requests while we try
1809 * our best to flush them, we make them sleep during the attribute refresh.
1810 *
1811 * A very similar scenario holds for the dir cache.
1812 */
24aa1fe6 1813static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1da177e4 1814{
8b4bdcf8 1815 struct nfs_server *server;
1da177e4 1816 struct nfs_inode *nfsi = NFS_I(inode);
951a143b 1817 loff_t cur_isize, new_isize;
2a3f5fd4 1818 unsigned long invalid = 0;
3e7d950a 1819 unsigned long now = jiffies;
62ab460c 1820 unsigned long save_cache_validity;
651b0e70 1821 bool have_writers = nfs_file_has_buffered_writers(nfsi);
944171cb 1822 bool cache_revalidated = true;
0b467264 1823 bool attr_changed = false;
c80d17c5 1824 bool have_delegation;
1da177e4 1825
1e8968c5 1826 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
3110ff80 1827 __func__, inode->i_sb->s_id, inode->i_ino,
4f1abd22 1828 nfs_display_fhandle_hash(NFS_FH(inode)),
1da177e4
LT		 1829 atomic_read(&inode->i_count), fattr->valid);
1830
eb3d8f42
TM		 1831 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1832 /* Only a mounted-on-fileid? Just exit */
1833 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1834 return 0;
7e10cc25 1835 /* Has the inode gone and changed behind our back? */
eb3d8f42 1836 } else if (nfsi->fileid != fattr->fileid) {
7e10cc25
TM		 1837 /* Is this perhaps the mounted-on fileid? */
1838 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1839 nfsi->fileid == fattr->mounted_on_fileid)
1840 return 0;
e73e6c9e
MT		 1841 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1842 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1843 NFS_SERVER(inode)->nfs_client->cl_hostname,
1844 inode->i_sb->s_id, (long long)nfsi->fileid,
1845 (long long)fattr->fileid);
1846 goto out_err;
1847 }
1da177e4
LT		 1848
1849 /*
1850 * Make sure the inode's type hasn't changed.
1851 */
e73e6c9e
MT		 1852 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1853 /*
1854 * Big trouble! The inode has become a different object.
1855 */
1e8968c5 1856 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
e73e6c9e
MT		 1857 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1858 goto out_err;
1859 }
1da177e4 1860
8b4bdcf8 1861 server = NFS_SERVER(inode);
a0356862 1862 /* Update the fsid? */
9e6e70f8 1863 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
c37dcd33 1864 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
36d43a43 1865 !IS_AUTOMOUNT(inode))
8b4bdcf8
TM		 1866 server->fsid = fattr->fsid;
1867
c80d17c5
TM		 1868 /* Save the delegation state before clearing cache_validity */
1869 have_delegation = nfs_have_delegated_attributes(inode);
1870
1da177e4
LT		 1871 /*
1872 * Update the read time so we don't revalidate too often.
1873 */
33801147 1874 nfsi->read_cache_jiffies = fattr->time_start;
3e7d950a 1875
62ab460c
TM		 1876 save_cache_validity = nfsi->cache_validity;
1877 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1878 | NFS_INO_INVALID_ATIME
1879 | NFS_INO_REVAL_FORCED
3a39e778
ZB		 1880 | NFS_INO_REVAL_PAGECACHE
1881 | NFS_INO_INVALID_BLOCKS);
1da177e4 1882
a895b4a1 1883 /* Do atomic weak cache consistency updates */
783b194c 1884 nfs_wcc_update_inode(inode, fattr);
a895b4a1 1885
944171cb
BC		 1886 if (pnfs_layoutcommit_outstanding(inode)) {
1887 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1888 cache_revalidated = false;
1889 }
10b7e9ad 1890
47aabaa7 1891 /* More cache consistency checks */
9e6e70f8 1892 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
c472c07b 1893 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
38512aa9 1894 /* Could it be a race with writeback? */
c80d17c5 1895 if (!(have_writers || have_delegation)) {
0b467264 1896 invalid |= NFS_INO_INVALID_DATA
38512aa9 1897 | NFS_INO_INVALID_ACCESS
95ad37f9
FL		 1898 | NFS_INO_INVALID_ACL
1899 | NFS_INO_INVALID_XATTR;
cac88f94 1900 /* Force revalidate of all attributes */
16e14375
TM		 1901 save_cache_validity |= NFS_INO_INVALID_CTIME
1902 | NFS_INO_INVALID_MTIME
1903 | NFS_INO_INVALID_SIZE
1904 | NFS_INO_INVALID_OTHER;
38512aa9
TM		 1905 if (S_ISDIR(inode->i_mode))
1906 nfs_force_lookup_revalidate(inode);
c80d17c5
TM		 1907 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1908 inode->i_sb->s_id,
1909 inode->i_ino);
1c341b77
TM		 1910 } else if (!have_delegation)
1911 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1eb5d98f 1912 inode_set_iversion_raw(inode, fattr->change_attr);
0b467264 1913 attr_changed = true;
9e6e70f8 1914 }
ade14a7d 1915 } else {
8619ddd0 1916 nfsi->cache_validity |= save_cache_validity &
16e14375 1917 (NFS_INO_INVALID_CHANGE
8619ddd0
TM		 1918 | NFS_INO_REVAL_PAGECACHE
1919 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1920 cache_revalidated = false;
1921 }
9e6e70f8
TM		 1922
1923 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
e86d5a02 1924 inode->i_mtime = fattr->mtime;
ade14a7d 1925 } else if (server->caps & NFS_CAP_MTIME) {
43b6535e 1926 nfsi->cache_validity |= save_cache_validity &
16e14375 1927 (NFS_INO_INVALID_MTIME
62ab460c 1928 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1929 cache_revalidated = false;
1930 }
62ab460c 1931
9e6e70f8 1932 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
e86d5a02 1933 inode->i_ctime = fattr->ctime;
ade14a7d 1934 } else if (server->caps & NFS_CAP_CTIME) {
43b6535e 1935 nfsi->cache_validity |= save_cache_validity &
16e14375 1936 (NFS_INO_INVALID_CTIME
62ab460c 1937 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1938 cache_revalidated = false;
1939 }
47aabaa7 1940
951a143b 1941 /* Check if our cached file size is stale */
9e6e70f8
TM		 1942 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1943 new_isize = nfs_size_to_loff_t(fattr->size);
1944 cur_isize = i_size_read(inode);
c80d17c5 1945 if (new_isize != cur_isize && !have_delegation) {
9e6e70f8
TM		 1946 /* Do we perhaps have any outstanding writes, or has
1947 * the file grown beyond our last write? */
a6b6d5b8 1948 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
9e6e70f8 1949 i_size_write(inode, new_isize);
ca0daa27 1950 if (!have_writers)
16e14375 1951 invalid |= NFS_INO_INVALID_DATA;
0b467264 1952 attr_changed = true;
9e6e70f8 1953 }
60c16ea8
HJ		 1954 dprintk("NFS: isize change on server for file %s/%ld "
1955 "(%Ld to %Ld)\n",
1956 inode->i_sb->s_id,
1957 inode->i_ino,
1958 (long long)cur_isize,
1959 (long long)new_isize);
1da177e4 1960 }
ade14a7d 1961 } else {
43b6535e 1962 nfsi->cache_validity |= save_cache_validity &
16e14375 1963 (NFS_INO_INVALID_SIZE
62ab460c
TM		 1964 | NFS_INO_REVAL_PAGECACHE
1965 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1966 cache_revalidated = false;
1967 }
1da177e4 1968
1da177e4 1969
9e6e70f8 1970 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
e86d5a02 1971 inode->i_atime = fattr->atime;
ade14a7d 1972 else if (server->caps & NFS_CAP_ATIME) {
43b6535e
TM		 1973 nfsi->cache_validity |= save_cache_validity &
1974 (NFS_INO_INVALID_ATIME
62ab460c 1975 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1976 cache_revalidated = false;
1977 }
1da177e4 1978
9e6e70f8
TM		 1979 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1980 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
9b4b3513
TM		 1981 umode_t newmode = inode->i_mode & S_IFMT;
1982 newmode |= fattr->mode & S_IALLUGO;
1983 inode->i_mode = newmode;
16e14375 1984 invalid |= NFS_INO_INVALID_ACCESS
0b467264
TM		 1985 | NFS_INO_INVALID_ACL;
1986 attr_changed = true;
9e6e70f8 1987 }
ade14a7d 1988 } else if (server->caps & NFS_CAP_MODE) {
43b6535e 1989 nfsi->cache_validity |= save_cache_validity &
0b467264 1990 (NFS_INO_INVALID_OTHER
62ab460c 1991 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1992 cache_revalidated = false;
1993 }
62ab460c 1994
9e6e70f8 1995 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
9ff593c4 1996 if (!uid_eq(inode->i_uid, fattr->uid)) {
16e14375 1997 invalid |= NFS_INO_INVALID_ACCESS
0b467264 1998 | NFS_INO_INVALID_ACL;
9e6e70f8 1999 inode->i_uid = fattr->uid;
0b467264 2000 attr_changed = true;
9e6e70f8 2001 }
ade14a7d 2002 } else if (server->caps & NFS_CAP_OWNER) {
43b6535e 2003 nfsi->cache_validity |= save_cache_validity &
0b467264 2004 (NFS_INO_INVALID_OTHER
62ab460c 2005 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2006 cache_revalidated = false;
2007 }
62ab460c 2008
9e6e70f8 2009 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
9ff593c4 2010 if (!gid_eq(inode->i_gid, fattr->gid)) {
16e14375 2011 invalid |= NFS_INO_INVALID_ACCESS
0b467264 2012 | NFS_INO_INVALID_ACL;
9e6e70f8 2013 inode->i_gid = fattr->gid;
0b467264 2014 attr_changed = true;
9e6e70f8 2015 }
ade14a7d 2016 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
43b6535e 2017 nfsi->cache_validity |= save_cache_validity &
0b467264 2018 (NFS_INO_INVALID_OTHER
62ab460c 2019 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2020 cache_revalidated = false;
2021 }
921615f1 2022
9e6e70f8
TM		 2023 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2024 if (inode->i_nlink != fattr->nlink) {
9e6e70f8
TM		 2025 if (S_ISDIR(inode->i_mode))
2026 invalid |= NFS_INO_INVALID_DATA;
bfe86848 2027 set_nlink(inode, fattr->nlink);
0b467264 2028 attr_changed = true;
9e6e70f8 2029 }
ade14a7d 2030 } else if (server->caps & NFS_CAP_NLINK) {
43b6535e 2031 nfsi->cache_validity |= save_cache_validity &
16e14375 2032 (NFS_INO_INVALID_OTHER
62ab460c 2033 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2034 cache_revalidated = false;
2035 }
1da177e4 2036
9e6e70f8 2037 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 2038 /*
2039 * report the blocks in 512byte units
2040 */
2041 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
ade14a7d 2042 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
9e6e70f8 2043 inode->i_blocks = fattr->du.nfs2.blocks;
3a39e778
ZB		 2044 else {
2045 nfsi->cache_validity |= save_cache_validity &
2046 (NFS_INO_INVALID_BLOCKS
2047 | NFS_INO_REVAL_FORCED);
ade14a7d 2048 cache_revalidated = false;
3a39e778 2049 }
1da177e4
LT		 2050
2051 /* Update attrtimeo value if we're out of the unstable period */
0b467264 2052 if (attr_changed) {
cac88f94 2053 invalid &= ~NFS_INO_INVALID_ATTR;
91d5b470 2054 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1da177e4 2055 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
3e7d950a 2056 nfsi->attrtimeo_timestamp = now;
f5062003 2057 /* Set barrier to be more recent than all outstanding updates */
4704f0e2 2058 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
6d2b2966 2059 } else {
ade14a7d
TM		 2060 if (cache_revalidated) {
2061 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2062 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2063 nfsi->attrtimeo <<= 1;
2064 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2065 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2066 }
6d2b2966
TM		 2067 nfsi->attrtimeo_timestamp = now;
2068 }
f5062003
TM		 2069 /* Set the barrier to be more recent than this fattr */
2070 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
2071 nfsi->attr_gencount = fattr->gencount;
1da177e4 2072 }
c812012f 2073
1da177e4
LT		 2074 /* Don't invalidate the data if we were to blame */
2075 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2076 || S_ISLNK(inode->i_mode)))
2077 invalid &= ~NFS_INO_INVALID_DATA;
c80d17c5 2078 nfs_set_cache_invalid(inode, invalid);
de242c0b 2079
1da177e4 2080 return 0;
b37b03b7 2081 out_err:
1da177e4
LT		 2082 /*
2083 * No need to worry about unhashing the dentry, as the
2084 * lookup validation will know that the inode is bad.
2085 * (But we fall through to invalidate the caches.)
2086 */
93ce4af7 2087 nfs_set_inode_stale_locked(inode);
1da177e4
LT		 2088 return -ESTALE;
2089}
2090
f7b422b1 2091struct inode *nfs_alloc_inode(struct super_block *sb)
1da177e4
LT		 2092{
2093 struct nfs_inode *nfsi;
c456aacf 2094 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1da177e4
LT		 2095 if (!nfsi)
2096 return NULL;
55296809
CL		 2097 nfsi->flags = 0UL;
2098 nfsi->cache_validity = 0UL;
89d77c8f 2099#if IS_ENABLED(CONFIG_NFS_V4)
e50a1c2e
BF		 2100 nfsi->nfs4_acl = NULL;
2101#endif /* CONFIG_NFS_V4 */
95ad37f9
FL		 2102#ifdef CONFIG_NFS_V4_2
2103 nfsi->xattr_cache = NULL;
2104#endif
1da177e4
LT		 2105 return &nfsi->vfs_inode;
2106}
89d77c8f 2107EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1da177e4 2108
ca1a199e 2109void nfs_free_inode(struct inode *inode)
1da177e4
LT		 2110{
2111 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2112}
ca1a199e 2113EXPORT_SYMBOL_GPL(nfs_free_inode);
fa0d7e3d 2114
d75d5414
AM		 2115static inline void nfs4_init_once(struct nfs_inode *nfsi)
2116{
89d77c8f 2117#if IS_ENABLED(CONFIG_NFS_V4)
d75d5414
AM		 2118 INIT_LIST_HEAD(&nfsi->open_states);
2119 nfsi->delegation = NULL;
d75d5414 2120 init_rwsem(&nfsi->rwsem);
e5e94017 2121 nfsi->layout = NULL;
d75d5414
AM		 2122#endif
2123}
f7b422b1 2124
51cc5068 2125static void init_once(void *foo)
1da177e4
LT		 2126{
2127 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2128
a35afb83 2129 inode_init_once(&nfsi->vfs_inode);
a35afb83
CL		 2130 INIT_LIST_HEAD(&nfsi->open_files);
2131 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2132 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
ea2cf228 2133 INIT_LIST_HEAD(&nfsi->commit_info.list);
a6b6d5b8 2134 atomic_long_set(&nfsi->nrequests, 0);
5cb953d4 2135 atomic_long_set(&nfsi->commit_info.ncommit, 0);
1a0de48a 2136 atomic_set(&nfsi->commit_info.rpcs_out, 0);
884be175 2137 init_rwsem(&nfsi->rmdir_sem);
e824f99a 2138 mutex_init(&nfsi->commit_mutex);
a35afb83 2139 nfs4_init_once(nfsi);
efeda80d 2140 nfsi->cache_change_attribute = 0;
1da177e4 2141}
20c2df83 2142
f7b422b1 2143static int __init nfs_init_inodecache(void)
1da177e4
LT		 2144{
2145 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2146 sizeof(struct nfs_inode),
fffb60f9 2147 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 2148 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 2149 init_once);
1da177e4
LT		 2150 if (nfs_inode_cachep == NULL)
2151 return -ENOMEM;
2152
2153 return 0;
2154}
2155
266bee88 2156static void nfs_destroy_inodecache(void)
1da177e4 2157{
8c0a8537
KS		 2158 /*
2159 * Make sure all delayed rcu free inodes are flushed before we
2160 * destroy cache.
2161 */
2162 rcu_barrier();
1a1d92c1 2163 kmem_cache_destroy(nfs_inode_cachep);
1da177e4
LT		 2164}
2165
5746006f 2166struct workqueue_struct *nfsiod_workqueue;
89d77c8f 2167EXPORT_SYMBOL_GPL(nfsiod_workqueue);
5746006f
TM		 2168
2169/*
2170 * start up the nfsiod workqueue
2171 */
2172static int nfsiod_start(void)
2173{
2174 struct workqueue_struct *wq;
2175 dprintk("RPC: creating workqueue nfsiod\n");
bf701b76 2176 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
5746006f
TM		 2177 if (wq == NULL)
2178 return -ENOMEM;
2179 nfsiod_workqueue = wq;
2180 return 0;
2181}
2182
2183/*
2184 * Destroy the nfsiod workqueue
2185 */
2186static void nfsiod_stop(void)
2187{
2188 struct workqueue_struct *wq;
2189
2190 wq = nfsiod_workqueue;
2191 if (wq == NULL)
2192 return;
2193 nfsiod_workqueue = NULL;
2194 destroy_workqueue(wq);
2195}
2196
c7d03a00 2197unsigned int nfs_net_id;
9e2e74db 2198EXPORT_SYMBOL_GPL(nfs_net_id);
1b340d01
SK		 2199
2200static int nfs_net_init(struct net *net)
2201{
6b13168b 2202 nfs_clients_init(net);
65b38851 2203 return nfs_fs_proc_net_init(net);
1b340d01
SK		 2204}
2205
2206static void nfs_net_exit(struct net *net)
2207{
65b38851 2208 nfs_fs_proc_net_exit(net);
10b7a70c 2209 nfs_clients_exit(net);
1b340d01
SK		 2210}
2211
2212static struct pernet_operations nfs_net_ops = {
2213 .init = nfs_net_init,
2214 .exit = nfs_net_exit,
2215 .id = &nfs_net_id,
2216 .size = sizeof(struct nfs_net),
2217};
2218
1da177e4
LT		 2219/*
2220 * Initialize NFS
2221 */
2222static int __init init_nfs_fs(void)
2223{
2224 int err;
2225
996bc4f4
TM		 2226 err = nfs_sysfs_init();
2227 if (err < 0)
2228 goto out10;
2229
1b340d01 2230 err = register_pernet_subsys(&nfs_net_ops);
e571cbf1 2231 if (err < 0)
89d77c8f 2232 goto out9;
e571cbf1 2233
8ec442ae
DH		 2234 err = nfs_fscache_register();
2235 if (err < 0)
89d77c8f 2236 goto out8;
8ec442ae 2237
5746006f
TM		 2238 err = nfsiod_start();
2239 if (err)
89d77c8f 2240 goto out7;
5746006f 2241
6aaca566
DH		 2242 err = nfs_fs_proc_init();
2243 if (err)
89d77c8f 2244 goto out6;
6aaca566 2245
1da177e4
LT		 2246 err = nfs_init_nfspagecache();
2247 if (err)
89d77c8f 2248 goto out5;
1da177e4
LT		 2249
2250 err = nfs_init_inodecache();
2251 if (err)
89d77c8f 2252 goto out4;
1da177e4
LT		 2253
2254 err = nfs_init_readpagecache();
2255 if (err)
89d77c8f 2256 goto out3;
1da177e4
LT		 2257
2258 err = nfs_init_writepagecache();
2259 if (err)
89d77c8f 2260 goto out2;
1da177e4 2261
1da177e4
LT		 2262 err = nfs_init_directcache();
2263 if (err)
89d77c8f 2264 goto out1;
1da177e4 2265
ec7652aa 2266 rpc_proc_register(&init_net, &nfs_rpcstat);
cd738ee9
KM		 2267
2268 err = register_nfs_fs();
2269 if (err)
129d1977
BS		 2270 goto out0;
2271
1da177e4 2272 return 0;
129d1977 2273out0:
ec7652aa 2274 rpc_proc_unregister(&init_net, "nfs");
1da177e4 2275 nfs_destroy_directcache();
89d77c8f 2276out1:
129d1977 2277 nfs_destroy_writepagecache();
89d77c8f 2278out2:
129d1977 2279 nfs_destroy_readpagecache();
89d77c8f 2280out3:
129d1977 2281 nfs_destroy_inodecache();
89d77c8f 2282out4:
129d1977 2283 nfs_destroy_nfspagecache();
89d77c8f 2284out5:
129d1977 2285 nfs_fs_proc_exit();
89d77c8f 2286out6:
129d1977 2287 nfsiod_stop();
89d77c8f 2288out7:
129d1977 2289 nfs_fscache_unregister();
89d77c8f 2290out8:
129d1977 2291 unregister_pernet_subsys(&nfs_net_ops);
89d77c8f 2292out9:
996bc4f4
TM		 2293 nfs_sysfs_exit();
2294out10:
1da177e4
LT		 2295 return err;
2296}
2297
2298static void __exit exit_nfs_fs(void)
2299{
1da177e4 2300 nfs_destroy_directcache();
1da177e4
LT		 2301 nfs_destroy_writepagecache();
2302 nfs_destroy_readpagecache();
2303 nfs_destroy_inodecache();
2304 nfs_destroy_nfspagecache();
8ec442ae 2305 nfs_fscache_unregister();
1b340d01 2306 unregister_pernet_subsys(&nfs_net_ops);
ec7652aa 2307 rpc_proc_unregister(&init_net, "nfs");
f7b422b1 2308 unregister_nfs_fs();
6aaca566 2309 nfs_fs_proc_exit();
5746006f 2310 nfsiod_stop();
996bc4f4 2311 nfs_sysfs_exit();
1da177e4
LT		 2312}
2313
2314/* Not quite true; I just maintain it */
2315MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2316MODULE_LICENSE("GPL");
f43bf0be 2317module_param(enable_ino64, bool, 0644);
1da177e4
LT		 2318
2319module_init(init_nfs_fs)
2320module_exit(exit_nfs_fs)
Linux 6.x block layer and io_uring tree(s)