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nfs: define and use the NFS_INO_INVALID_XATTR flag
[linux-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}
196
6edf9609
TM		 197static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
198{
199 struct nfs_inode *nfsi = NFS_I(inode);
3f0b3cf4
TM		 200 bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
201
202 if (have_delegation) {
203 if (!(flags & NFS_INO_REVAL_FORCED))
204 flags &= ~NFS_INO_INVALID_OTHER;
205 flags &= ~(NFS_INO_INVALID_CHANGE
206 | NFS_INO_INVALID_SIZE
0f44da51
FL		 207 | NFS_INO_REVAL_PAGECACHE
208 | NFS_INO_INVALID_XATTR);
3f0b3cf4 209 }
6edf9609
TM		 210
211 if (inode->i_mapping->nrpages == 0)
1c341b77 212 flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER);
6edf9609
TM		 213 nfsi->cache_validity |= flags;
214 if (flags & NFS_INO_INVALID_DATA)
215 nfs_fscache_invalidate(inode);
216}
217
1da177e4
LT		 218/*
219 * Invalidate the local caches
220 */
b37b03b7 221static void nfs_zap_caches_locked(struct inode *inode)
1da177e4
LT		 222{
223 struct nfs_inode *nfsi = NFS_I(inode);
224 int mode = inode->i_mode;
225
91d5b470
CL		 226 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
227
c7c20973
TM		 228 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
229 nfsi->attrtimeo_timestamp = jiffies;
1da177e4 230
c3f52af3 231 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
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
6edf9609 237 | NFS_INO_REVAL_PAGECACHE);
aa9c2669 238 } else
6edf9609 239 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 240 | NFS_INO_INVALID_ACCESS
241 | NFS_INO_INVALID_ACL
6edf9609 242 | NFS_INO_REVAL_PAGECACHE);
fd1defc2 243 nfs_zap_label_cache_locked(nfsi);
b37b03b7 244}
dc59250c 245
b37b03b7
TM		 246void nfs_zap_caches(struct inode *inode)
247{
248 spin_lock(&inode->i_lock);
249 nfs_zap_caches_locked(inode);
dc59250c 250 spin_unlock(&inode->i_lock);
ada70d94
TM		 251}
252
cd9ae2b6
TM		 253void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
254{
255 if (mapping->nrpages != 0) {
256 spin_lock(&inode->i_lock);
6edf9609 257 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
cd9ae2b6
TM		 258 spin_unlock(&inode->i_lock);
259 }
260}
261
f41f7418 262void nfs_zap_acl_cache(struct inode *inode)
ada70d94
TM		 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);
dc59250c 269 spin_lock(&inode->i_lock);
55296809 270 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
dc59250c 271 spin_unlock(&inode->i_lock);
1da177e4 272}
1c606fb7 273EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
1da177e4 274
c4812998
TM		 275void nfs_invalidate_atime(struct inode *inode)
276{
277 spin_lock(&inode->i_lock);
6edf9609 278 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
c4812998
TM		 279 spin_unlock(&inode->i_lock);
280}
ddda8e0a 281EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
c4812998 282
1da177e4 283/*
b37b03b7
TM		 284 * Invalidate, but do not unhash, the inode.
285 * NB: must be called with inode->i_lock held!
1da177e4 286 */
93ce4af7 287static void nfs_set_inode_stale_locked(struct inode *inode)
1da177e4 288{
3a10c30a 289 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
b37b03b7 290 nfs_zap_caches_locked(inode);
93ce4af7
TM		 291 trace_nfs_set_inode_stale(inode);
292}
293
294void nfs_set_inode_stale(struct inode *inode)
295{
296 spin_lock(&inode->i_lock);
297 nfs_set_inode_stale_locked(inode);
298 spin_unlock(&inode->i_lock);
1da177e4
LT		 299}
300
301struct nfs_find_desc {
302 struct nfs_fh *fh;
303 struct nfs_fattr *fattr;
304};
305
306/*
307 * In NFSv3 we can have 64bit inode numbers. In order to support
308 * this, and re-exported directories (also seen in NFSv2)
309 * we are forced to allow 2 different inodes to have the same
310 * i_ino.
311 */
312static int
313nfs_find_actor(struct inode *inode, void *opaque)
314{
315 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
316 struct nfs_fh *fh = desc->fh;
317 struct nfs_fattr *fattr = desc->fattr;
318
319 if (NFS_FILEID(inode) != fattr->fileid)
320 return 0;
f6488c9b
JL		 321 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
322 return 0;
1da177e4
LT		 323 if (nfs_compare_fh(NFS_FH(inode), fh))
324 return 0;
325 if (is_bad_inode(inode) || NFS_STALE(inode))
326 return 0;
327 return 1;
328}
329
330static int
331nfs_init_locked(struct inode *inode, void *opaque)
332{
333 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
334 struct nfs_fattr *fattr = desc->fattr;
335
99fadcd7 336 set_nfs_fileid(inode, fattr->fileid);
916ec34d 337 inode->i_mode = fattr->mode;
1da177e4
LT		 338 nfs_copy_fh(NFS_FH(inode), desc->fh);
339 return 0;
340}
341
e058f70b 342#ifdef CONFIG_NFS_V4_SECURITY_LABEL
fd1defc2
TM		 343static void nfs_clear_label_invalid(struct inode *inode)
344{
345 spin_lock(&inode->i_lock);
346 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
347 spin_unlock(&inode->i_lock);
348}
349
aa9c2669
DQ		 350void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
351 struct nfs4_label *label)
352{
353 int error;
354
355 if (label == NULL)
356 return;
357
aa9c2669
DQ		 358 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
359 error = security_inode_notifysecctx(inode, label->label,
360 label->len);
361 if (error)
362 printk(KERN_ERR "%s() %s %d "
363 "security_inode_notifysecctx() %d\n",
364 __func__,
365 (char *)label->label,
366 label->len, error);
fd1defc2 367 nfs_clear_label_invalid(inode);
aa9c2669
DQ		 368 }
369}
370
e058f70b
SD		 371struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
372{
373 struct nfs4_label *label = NULL;
374 int minor_version = server->nfs_client->cl_minorversion;
375
376 if (minor_version < 2)
377 return label;
378
379 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
380 return label;
381
382 label = kzalloc(sizeof(struct nfs4_label), flags);
383 if (label == NULL)
384 return ERR_PTR(-ENOMEM);
385
386 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
387 if (label->label == NULL) {
388 kfree(label);
389 return ERR_PTR(-ENOMEM);
390 }
391 label->len = NFS4_MAXLABELLEN;
392
393 return label;
394}
395EXPORT_SYMBOL_GPL(nfs4_label_alloc);
aa9c2669 396#else
829e57d7 397void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
aa9c2669
DQ		 398 struct nfs4_label *label)
399{
400}
e058f70b 401#endif
aa9c2669 402EXPORT_SYMBOL_GPL(nfs_setsecurity);
e058f70b 403
f174ff7a
PT		 404/* Search for inode identified by fh, fileid and i_mode in inode cache. */
405struct inode *
406nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
407{
408 struct nfs_find_desc desc = {
409 .fh = fh,
410 .fattr = fattr,
411 };
412 struct inode *inode;
413 unsigned long hash;
414
415 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
416 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
417 return NULL;
418
419 hash = nfs_fattr_to_ino_t(fattr);
420 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
421
422 dprintk("%s: returning %p\n", __func__, inode);
423 return inode;
424}
425
1da177e4
LT		 426/*
427 * This is our front-end to iget that looks up inodes by file handle
428 * instead of inode number.
429 */
430struct inode *
1775fd3e 431nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
1da177e4
LT		 432{
433 struct nfs_find_desc desc = {
434 .fh = fh,
435 .fattr = fattr
436 };
03f28e3a 437 struct inode *inode = ERR_PTR(-ENOENT);
1da177e4
LT		 438 unsigned long hash;
439
7ebb9315
BS		 440 nfs_attr_check_mountpoint(sb, fattr);
441
2ef47eb1
AS		 442 if (nfs_attr_use_mounted_on_fileid(fattr))
443 fattr->fileid = fattr->mounted_on_fileid;
444 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
1da177e4 445 goto out_no_inode;
9e6e70f8 446 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
1da177e4 447 goto out_no_inode;
1da177e4
LT		 448
449 hash = nfs_fattr_to_ino_t(fattr);
450
03f28e3a
TM		 451 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
452 if (inode == NULL) {
453 inode = ERR_PTR(-ENOMEM);
1da177e4 454 goto out_no_inode;
03f28e3a 455 }
1da177e4
LT		 456
457 if (inode->i_state & I_NEW) {
458 struct nfs_inode *nfsi = NFS_I(inode);
b0c4fddc 459 unsigned long now = jiffies;
1da177e4
LT		 460
461 /* We set i_ino for the few things that still rely on it,
462 * such as stat(2) */
463 inode->i_ino = hash;
464
465 /* We can't support update_atime(), since the server will reset it */
466 inode->i_flags |= S_NOATIME|S_NOCMTIME;
467 inode->i_mode = fattr->mode;
821a868a 468 nfsi->cache_validity = 0;
62ab460c
TM		 469 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
470 && nfs_server_capable(inode, NFS_CAP_MODE))
16e14375 471 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
1da177e4
LT		 472 /* Why so? Because we want revalidate for devices/FIFOs, and
473 * that's precisely what we have in nfs_file_inode_operations.
474 */
8fa5c000 475 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
1da177e4 476 if (S_ISREG(inode->i_mode)) {
1788ea6e 477 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
1da177e4 478 inode->i_data.a_ops = &nfs_file_aops;
1da177e4 479 } else if (S_ISDIR(inode->i_mode)) {
8fa5c000 480 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
1da177e4 481 inode->i_fop = &nfs_dir_operations;
11de3b11 482 inode->i_data.a_ops = &nfs_dir_aops;
55a97593 483 /* Deal with crossing mountpoints */
7ebb9315
BS		 484 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
485 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
6b97fd3d
MN		 486 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
487 inode->i_op = &nfs_referral_inode_operations;
488 else
489 inode->i_op = &nfs_mountpoint_inode_operations;
55a97593 490 inode->i_fop = NULL;
36d43a43 491 inode->i_flags |= S_AUTOMOUNT;
55a97593 492 }
21fc61c7 493 } else if (S_ISLNK(inode->i_mode)) {
1da177e4 494 inode->i_op = &nfs_symlink_inode_operations;
21fc61c7
AV		 495 inode_nohighmem(inode);
496 } else
1da177e4
LT		 497 init_special_inode(inode, inode->i_mode, fattr->rdev);
498
9e6e70f8
TM		 499 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
500 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
501 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
1eb5d98f 502 inode_set_iversion_raw(inode, 0);
9e6e70f8 503 inode->i_size = 0;
6d6b77f1 504 clear_nlink(inode);
9ff593c4
EB		 505 inode->i_uid = make_kuid(&init_user_ns, -2);
506 inode->i_gid = make_kgid(&init_user_ns, -2);
9e6e70f8
TM		 507 inode->i_blocks = 0;
508 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
2701d086
AA		 509 nfsi->write_io = 0;
510 nfsi->read_io = 0;
9e6e70f8 511
33801147 512 nfsi->read_cache_jiffies = fattr->time_start;
4704f0e2 513 nfsi->attr_gencount = fattr->gencount;
9e6e70f8 514 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
e86d5a02 515 inode->i_atime = fattr->atime;
62ab460c 516 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
16e14375 517 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
9e6e70f8 518 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
e86d5a02 519 inode->i_mtime = fattr->mtime;
62ab460c 520 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
16e14375 521 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
9e6e70f8 522 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 523 inode->i_ctime = fattr->ctime;
62ab460c 524 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
16e14375 525 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
9e6e70f8 526 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1eb5d98f 527 inode_set_iversion_raw(inode, fattr->change_attr);
cd812599 528 else
16e14375 529 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
9e6e70f8
TM		 530 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
531 inode->i_size = nfs_size_to_loff_t(fattr->size);
62ab460c 532 else
16e14375 533 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
9e6e70f8 534 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
bfe86848 535 set_nlink(inode, fattr->nlink);
62ab460c 536 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
16e14375 537 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 538 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
539 inode->i_uid = fattr->uid;
62ab460c 540 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
16e14375 541 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 542 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
543 inode->i_gid = fattr->gid;
62ab460c 544 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
16e14375 545 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
0f44da51
FL		 546 if (nfs_server_capable(inode, NFS_CAP_XATTR))
547 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
9e6e70f8
TM		 548 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
549 inode->i_blocks = fattr->du.nfs2.blocks;
550 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 551 /*
552 * report the blocks in 512byte units
553 */
554 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1da177e4 555 }
aa9c2669 556
821a868a
TM		 557 if (nfsi->cache_validity != 0)
558 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
559
aa9c2669
DQ		 560 nfs_setsecurity(inode, fattr, label);
561
1da177e4 562 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
b0c4fddc 563 nfsi->attrtimeo_timestamp = now;
1c3c07e9 564 nfsi->access_cache = RB_ROOT;
1da177e4 565
f1fe29b4 566 nfs_fscache_init_inode(inode);
ef79c097 567
1da177e4 568 unlock_new_inode(inode);
26fde4df
N		 569 } else {
570 int err = nfs_refresh_inode(inode, fattr);
571 if (err < 0) {
572 iput(inode);
573 inode = ERR_PTR(err);
574 goto out_no_inode;
575 }
576 }
1e8968c5 577 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
1da177e4 578 inode->i_sb->s_id,
1e8968c5 579 (unsigned long long)NFS_FILEID(inode),
4f1abd22 580 nfs_display_fhandle_hash(fh),
1da177e4
LT		 581 atomic_read(&inode->i_count));
582
583out:
584 return inode;
585
586out_no_inode:
03f28e3a 587 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
1da177e4
LT		 588 goto out;
589}
89d77c8f 590EXPORT_SYMBOL_GPL(nfs_fhget);
1da177e4 591
536e43d1 592#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		 593
594int
595nfs_setattr(struct dentry *dentry, struct iattr *attr)
596{
2b0143b5 597 struct inode *inode = d_inode(dentry);
987f8dfc 598 struct nfs_fattr *fattr;
ae57ca0f 599 int error = 0;
1da177e4 600
91d5b470
CL		 601 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
602
188b95dd
JL		 603 /* skip mode change if it's just for clearing setuid/setgid */
604 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
605 attr->ia_valid &= ~ATTR_MODE;
606
1da177e4 607 if (attr->ia_valid & ATTR_SIZE) {
08a899d5
CH		 608 BUG_ON(!S_ISREG(inode->i_mode));
609
ae57ca0f
KM		 610 error = inode_newsize_ok(inode, attr->ia_size);
611 if (error)
612 return error;
613
614 if (attr->ia_size == i_size_read(inode))
1da177e4
LT		 615 attr->ia_valid &= ~ATTR_SIZE;
616 }
617
618 /* Optimization: if the end result is no change, don't RPC */
619 attr->ia_valid &= NFS_VALID_ATTRS;
536e43d1 620 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
1da177e4
LT		 621 return 0;
622
f4ce1299
TM		 623 trace_nfs_setattr_enter(inode);
624
755c1e20 625 /* Write all dirty data */
4d346bea
TM		 626 if (S_ISREG(inode->i_mode))
627 nfs_sync_inode(inode);
987f8dfc
TM		 628
629 fattr = nfs_alloc_fattr();
ae57ca0f
KM		 630 if (fattr == NULL) {
631 error = -ENOMEM;
987f8dfc 632 goto out;
ae57ca0f
KM		 633 }
634
987f8dfc 635 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
65e4308d 636 if (error == 0)
aa9c2669 637 error = nfs_refresh_inode(inode, fattr);
987f8dfc
TM		 638 nfs_free_fattr(fattr);
639out:
f4ce1299 640 trace_nfs_setattr_exit(inode, error);
65e4308d
TM		 641 return error;
642}
ddda8e0a 643EXPORT_SYMBOL_GPL(nfs_setattr);
65e4308d 644
a3d01454
TM		 645/**
646 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
647 * @inode: inode of the file used
648 * @offset: file offset to start truncating
649 *
650 * This is a copy of the common vmtruncate, but with the locking
651 * corrected to take into account the fact that NFS requires
652 * inode->i_size to be updated under the inode->i_lock.
f044636d 653 * Note: must be called with inode->i_lock held!
a3d01454
TM		 654 */
655static int nfs_vmtruncate(struct inode * inode, loff_t offset)
656{
c08d3b0e 657 int err;
a3d01454 658
c08d3b0e 659 err = inode_newsize_ok(inode, offset);
660 if (err)
661 goto out;
a3d01454 662
c08d3b0e 663 i_size_write(inode, offset);
6edf9609
TM		 664 /* Optimisation */
665 if (offset == 0)
1c341b77
TM		 666 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA |
667 NFS_INO_DATA_INVAL_DEFER);
f6cdfa6d 668 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
c08d3b0e 669
f044636d 670 spin_unlock(&inode->i_lock);
7caef267 671 truncate_pagecache(inode, offset);
f044636d 672 spin_lock(&inode->i_lock);
c08d3b0e 673out:
674 return err;
a3d01454
TM		 675}
676
65e4308d
TM		 677/**
678 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
679 * @inode: pointer to struct inode
680 * @attr: pointer to struct iattr
16e14375 681 * @fattr: pointer to struct nfs_fattr
65e4308d
TM		 682 *
683 * Note: we do this in the *proc.c in order to ensure that
684 * it works for things like exclusive creates too.
685 */
f044636d
TM		 686void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
687 struct nfs_fattr *fattr)
65e4308d 688{
f044636d
TM		 689 /* Barrier: bump the attribute generation count. */
690 nfs_fattr_set_barrier(fattr);
691
692 spin_lock(&inode->i_lock);
693 NFS_I(inode)->attr_gencount = fattr->gencount;
6a97d02d
TM		 694 if ((attr->ia_valid & ATTR_SIZE) != 0) {
695 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
696 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
697 nfs_vmtruncate(inode, attr->ia_size);
698 }
65e4308d 699 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
6a97d02d 700 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
1da177e4 701 if ((attr->ia_valid & ATTR_MODE) != 0) {
65e4308d
TM		 702 int mode = attr->ia_mode & S_IALLUGO;
703 mode |= inode->i_mode & ~S_IALLUGO;
1da177e4
LT		 704 inode->i_mode = mode;
705 }
706 if ((attr->ia_valid & ATTR_UID) != 0)
707 inode->i_uid = attr->ia_uid;
708 if ((attr->ia_valid & ATTR_GID) != 0)
709 inode->i_gid = attr->ia_gid;
6a97d02d 710 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 711 inode->i_ctime = fattr->ctime;
6a97d02d
TM		 712 else
713 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
714 | NFS_INO_INVALID_CTIME);
6edf9609
TM		 715 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
716 | NFS_INO_INVALID_ACL);
65e4308d 717 }
6a97d02d
TM		 718 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
719 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
720 | NFS_INO_INVALID_CTIME);
721 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
e86d5a02 722 inode->i_atime = fattr->atime;
6a97d02d
TM		 723 else if (attr->ia_valid & ATTR_ATIME_SET)
724 inode->i_atime = attr->ia_atime;
725 else
726 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
727
728 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 729 inode->i_ctime = fattr->ctime;
6a97d02d
TM		 730 else
731 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
732 | NFS_INO_INVALID_CTIME);
733 }
734 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
735 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
736 | NFS_INO_INVALID_CTIME);
737 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
e86d5a02 738 inode->i_mtime = fattr->mtime;
6a97d02d
TM		 739 else if (attr->ia_valid & ATTR_MTIME_SET)
740 inode->i_mtime = attr->ia_mtime;
741 else
742 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
743
744 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 745 inode->i_ctime = fattr->ctime;
6a97d02d
TM		 746 else
747 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
748 | NFS_INO_INVALID_CTIME);
65e4308d 749 }
616c3196
JL		 750 if (fattr->valid)
751 nfs_update_inode(inode, fattr);
f044636d 752 spin_unlock(&inode->i_lock);
1da177e4 753}
ddda8e0a 754EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
1da177e4 755
1bcf4c5c 756static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
311324ad
TM		 757{
758 struct dentry *parent;
759
1bcf4c5c
TM		 760 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
761 return;
311324ad 762 parent = dget_parent(dentry);
2b0143b5 763 nfs_force_use_readdirplus(d_inode(parent));
311324ad
TM		 764 dput(parent);
765}
766
1bcf4c5c
TM		 767static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
768{
769 struct dentry *parent;
770
771 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
772 return;
773 parent = dget_parent(dentry);
774 nfs_advise_use_readdirplus(d_inode(parent));
775 dput(parent);
776}
777
311324ad
TM		 778static bool nfs_need_revalidate_inode(struct inode *inode)
779{
780 if (NFS_I(inode)->cache_validity &
781 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
782 return true;
783 if (nfs_attribute_cache_expired(inode))
784 return true;
785 return false;
786}
787
a528d35e
DH		 788int nfs_getattr(const struct path *path, struct kstat *stat,
789 u32 request_mask, unsigned int query_flags)
1da177e4 790{
a528d35e 791 struct inode *inode = d_inode(path->dentry);
9ccee940
TM		 792 struct nfs_server *server = NFS_SERVER(inode);
793 unsigned long cache_validity;
16caf5b6 794 int err = 0;
9ccee940
TM		 795 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
796 bool do_update = false;
1da177e4 797
f4ce1299 798 trace_nfs_getattr_enter(inode);
9ccee940
TM		 799
800 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync)
801 goto out_no_update;
802
acdc53b2 803 /* Flush out writes to the server in order to update c/mtime. */
9ccee940
TM		 804 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
805 S_ISREG(inode->i_mode)) {
79566ef0 806 err = filemap_write_and_wait(inode->i_mapping);
acdc53b2
TM		 807 if (err)
808 goto out;
28c494c5 809 }
fc33a7bb
CH		 810
811 /*
812 * We may force a getattr if the user cares about atime.
813 *
814 * Note that we only have to check the vfsmount flags here:
815 * - NFS always sets S_NOATIME by so checking it would give a
816 * bogus result
1751e8a6 817 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
fc33a7bb
CH		 818 * no point in checking those.
819 */
a528d35e
DH		 820 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
821 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
9ccee940
TM		 822 request_mask &= ~STATX_ATIME;
823
824 /* Is the user requesting attributes that might need revalidation? */
825 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
826 STATX_MTIME|STATX_UID|STATX_GID|
827 STATX_SIZE|STATX_BLOCKS)))
828 goto out_no_revalidate;
829
830 /* Check whether the cached attributes are stale */
831 do_update |= force_sync || nfs_attribute_cache_expired(inode);
832 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
833 do_update |= cache_validity &
834 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
835 if (request_mask & STATX_ATIME)
836 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
837 if (request_mask & (STATX_CTIME|STATX_MTIME))
838 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
3a39e778
ZB		 839 if (request_mask & STATX_BLOCKS)
840 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
9ccee940
TM		 841 if (do_update) {
842 /* Update the attribute cache */
59b86d85
HT		 843 if (!(server->flags & NFS_MOUNT_NOAC))
844 nfs_readdirplus_parent_cache_miss(path->dentry);
845 else
846 nfs_readdirplus_parent_cache_hit(path->dentry);
311324ad 847 err = __nfs_revalidate_inode(server, inode);
9ccee940
TM		 848 if (err)
849 goto out;
1bcf4c5c 850 } else
a528d35e 851 nfs_readdirplus_parent_cache_hit(path->dentry);
9ccee940
TM		 852out_no_revalidate:
853 /* Only return attributes that were revalidated. */
854 stat->result_mask &= request_mask;
855out_no_update:
856 generic_fillattr(inode, stat);
857 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
858 if (S_ISDIR(inode->i_mode))
859 stat->blksize = NFS_SERVER(inode)->dtsize;
acdc53b2 860out:
f4ce1299 861 trace_nfs_getattr_exit(inode, err);
1da177e4
LT		 862 return err;
863}
ddda8e0a 864EXPORT_SYMBOL_GPL(nfs_getattr);
1da177e4 865
f11ac8db
TM		 866static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
867{
2f62b5aa 868 refcount_set(&l_ctx->count, 1);
d51fdb87 869 l_ctx->lockowner = current->files;
f11ac8db 870 INIT_LIST_HEAD(&l_ctx->list);
210c7c17 871 atomic_set(&l_ctx->io_count, 0);
f11ac8db
TM		 872}
873
874static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
875{
1db97eaa 876 struct nfs_lock_context *pos;
f11ac8db 877
1db97eaa 878 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
d51fdb87 879 if (pos->lockowner != current->files)
f11ac8db 880 continue;
1db97eaa
TM		 881 if (refcount_inc_not_zero(&pos->count))
882 return pos;
883 }
f11ac8db
TM		 884 return NULL;
885}
886
887struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
888{
889 struct nfs_lock_context *res, *new = NULL;
2b0143b5 890 struct inode *inode = d_inode(ctx->dentry);
f11ac8db 891
1db97eaa 892 rcu_read_lock();
f11ac8db 893 res = __nfs_find_lock_context(ctx);
1db97eaa 894 rcu_read_unlock();
f11ac8db 895 if (res == NULL) {
f11ac8db
TM		 896 new = kmalloc(sizeof(*new), GFP_KERNEL);
897 if (new == NULL)
b3c54de6 898 return ERR_PTR(-ENOMEM);
f11ac8db
TM		 899 nfs_init_lock_context(new);
900 spin_lock(&inode->i_lock);
901 res = __nfs_find_lock_context(ctx);
902 if (res == NULL) {
15494511
TM		 903 new->open_context = get_nfs_open_context(ctx);
904 if (new->open_context) {
905 list_add_tail_rcu(&new->list,
906 &ctx->lock_context.list);
907 res = new;
908 new = NULL;
909 } else
910 res = ERR_PTR(-EBADF);
f11ac8db 911 }
1db97eaa
TM		 912 spin_unlock(&inode->i_lock);
913 kfree(new);
f11ac8db 914 }
f11ac8db
TM		 915 return res;
916}
1c6dcbe5 917EXPORT_SYMBOL_GPL(nfs_get_lock_context);
f11ac8db
TM		 918
919void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
920{
921 struct nfs_open_context *ctx = l_ctx->open_context;
2b0143b5 922 struct inode *inode = d_inode(ctx->dentry);
f11ac8db 923
2f62b5aa 924 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
f11ac8db 925 return;
1db97eaa 926 list_del_rcu(&l_ctx->list);
f11ac8db 927 spin_unlock(&inode->i_lock);
15494511 928 put_nfs_open_context(ctx);
1db97eaa 929 kfree_rcu(l_ctx, rcu_head);
f11ac8db 930}
1c6dcbe5 931EXPORT_SYMBOL_GPL(nfs_put_lock_context);
f11ac8db 932
7fe5c398
TM		 933/**
934 * nfs_close_context - Common close_context() routine NFSv2/v3
935 * @ctx: pointer to context
936 * @is_sync: is this a synchronous close
937 *
5cf9d706
TM		 938 * Ensure that the attributes are up to date if we're mounted
939 * with close-to-open semantics and we have cached data that will
940 * need to be revalidated on open.
7fe5c398
TM		 941 */
942void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
943{
5cf9d706 944 struct nfs_inode *nfsi;
7fe5c398
TM		 945 struct inode *inode;
946 struct nfs_server *server;
947
948 if (!(ctx->mode & FMODE_WRITE))
949 return;
950 if (!is_sync)
951 return;
2b0143b5 952 inode = d_inode(ctx->dentry);
58ff4184
TM		 953 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
954 return;
5cf9d706
TM		 955 nfsi = NFS_I(inode);
956 if (inode->i_mapping->nrpages == 0)
957 return;
958 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
959 return;
960 if (!list_empty(&nfsi->open_files))
7fe5c398
TM		 961 return;
962 server = NFS_SERVER(inode);
963 if (server->flags & NFS_MOUNT_NOCTO)
964 return;
965 nfs_revalidate_inode(server, inode);
966}
ddda8e0a 967EXPORT_SYMBOL_GPL(nfs_close_context);
7fe5c398 968
532d4def
N		 969struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
970 fmode_t f_mode,
971 struct file *filp)
1da177e4
LT		 972{
973 struct nfs_open_context *ctx;
974
f52720ca 975 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
1d179d6b 976 if (!ctx)
5ede7b1c 977 return ERR_PTR(-ENOMEM);
5ede7b1c
AV		 978 nfs_sb_active(dentry->d_sb);
979 ctx->dentry = dget(dentry);
1d179d6b
TM		 980 if (filp)
981 ctx->cred = get_cred(filp->f_cred);
982 else
983 ctx->cred = get_current_cred();
ddf529ee 984 ctx->ll_cred = NULL;
5ede7b1c
AV		 985 ctx->state = NULL;
986 ctx->mode = f_mode;
987 ctx->flags = 0;
988 ctx->error = 0;
532d4def 989 ctx->flock_owner = (fl_owner_t)filp;
5ede7b1c
AV		 990 nfs_init_lock_context(&ctx->lock_context);
991 ctx->lock_context.open_context = ctx;
992 INIT_LIST_HEAD(&ctx->list);
82be417a 993 ctx->mdsthreshold = NULL;
1da177e4
LT		 994 return ctx;
995}
89d77c8f 996EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1da177e4
LT		 997
998struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
999{
0de43976
TM		 1000 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1001 return ctx;
1002 return NULL;
1da177e4 1003}
89d77c8f 1004EXPORT_SYMBOL_GPL(get_nfs_open_context);
1da177e4 1005
7fe5c398 1006static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1da177e4 1007{
2b0143b5 1008 struct inode *inode = d_inode(ctx->dentry);
3d4ff43d 1009 struct super_block *sb = ctx->dentry->d_sb;
3bec63db 1010
0de43976
TM		 1011 if (!refcount_dec_and_test(&ctx->lock_context.count))
1012 return;
5c78f58e 1013 if (!list_empty(&ctx->list)) {
0de43976
TM		 1014 spin_lock(&inode->i_lock);
1015 list_del_rcu(&ctx->list);
ef84303e 1016 spin_unlock(&inode->i_lock);
0de43976 1017 }
5c78f58e
TM		 1018 if (inode != NULL)
1019 NFS_PROTO(inode)->close_context(ctx, is_sync);
a52458b4 1020 put_cred(ctx->cred);
3d4ff43d 1021 dput(ctx->dentry);
322b2b90 1022 nfs_sb_deactive(sb);
ddf529ee 1023 put_rpccred(ctx->ll_cred);
82be417a 1024 kfree(ctx->mdsthreshold);
0de43976 1025 kfree_rcu(ctx, rcu_head);
3bec63db
TM		 1026}
1027
a49c3c77
TM		 1028void put_nfs_open_context(struct nfs_open_context *ctx)
1029{
1030 __put_nfs_open_context(ctx, 0);
1031}
89d77c8f 1032EXPORT_SYMBOL_GPL(put_nfs_open_context);
a49c3c77 1033
4eae5014
TM		 1034static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1035{
1036 __put_nfs_open_context(ctx, 1);
1037}
1038
1da177e4
LT		 1039/*
1040 * Ensure that mmap has a recent RPC credential for use when writing out
1041 * shared pages
1042 */
c45ffdd2 1043void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1da177e4 1044{
2b0143b5 1045 struct inode *inode = d_inode(ctx->dentry);
1da177e4
LT		 1046 struct nfs_inode *nfsi = NFS_I(inode);
1047
1da177e4 1048 spin_lock(&inode->i_lock);
1c341b77
TM		 1049 if (list_empty(&nfsi->open_files) &&
1050 (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER))
1051 nfsi->cache_validity |= NFS_INO_INVALID_DATA |
1052 NFS_INO_REVAL_FORCED;
0de43976 1053 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1da177e4
LT		 1054 spin_unlock(&inode->i_lock);
1055}
c45ffdd2
TM		 1056EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1057
1058void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1059{
1060 filp->private_data = get_nfs_open_context(ctx);
1061 if (list_empty(&ctx->list))
1062 nfs_inode_attach_open_context(ctx);
1063}
89d77c8f 1064EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1da177e4 1065
d530838b
TM		 1066/*
1067 * Given an inode, search for an open context with the desired characteristics
1068 */
a52458b4 1069struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1da177e4
LT		 1070{
1071 struct nfs_inode *nfsi = NFS_I(inode);
1072 struct nfs_open_context *pos, *ctx = NULL;
1073
0de43976
TM		 1074 rcu_read_lock();
1075 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
65f51603 1076 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
d530838b 1077 continue;
1544fa0f
TM		 1078 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1079 continue;
1080 ctx = get_nfs_open_context(pos);
0de43976
TM		 1081 if (ctx)
1082 break;
1da177e4 1083 }
0de43976 1084 rcu_read_unlock();
1da177e4
LT		 1085 return ctx;
1086}
1087
aff8d8dc 1088void nfs_file_clear_open_context(struct file *filp)
1da177e4 1089{
cd3758e3 1090 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1da177e4
LT		 1091
1092 if (ctx) {
2b0143b5 1093 struct inode *inode = d_inode(ctx->dentry);
c45ffdd2 1094
0bcbf039
PT		 1095 /*
1096 * We fatal error on write before. Try to writeback
1097 * every page again.
1098 */
1099 if (ctx->error < 0)
1100 invalidate_inode_pages2(inode->i_mapping);
1da177e4 1101 filp->private_data = NULL;
4eae5014 1102 put_nfs_open_context_sync(ctx);
1da177e4
LT		 1103 }
1104}
1105
1106/*
1107 * These allocate and release file read/write context information.
1108 */
1109int nfs_open(struct inode *inode, struct file *filp)
1110{
1111 struct nfs_open_context *ctx;
1da177e4 1112
532d4def 1113 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
5ede7b1c
AV		 1114 if (IS_ERR(ctx))
1115 return PTR_ERR(ctx);
1da177e4
LT		 1116 nfs_file_set_open_context(filp, ctx);
1117 put_nfs_open_context(ctx);
f1fe29b4 1118 nfs_fscache_open_file(inode, filp);
1da177e4
LT		 1119 return 0;
1120}
44942b4e 1121EXPORT_SYMBOL_GPL(nfs_open);
1da177e4 1122
1da177e4
LT		 1123/*
1124 * This function is called whenever some part of NFS notices that
1125 * the cached attributes have to be refreshed.
1126 */
1127int
1128__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1129{
1130 int status = -ESTALE;
1775fd3e 1131 struct nfs4_label *label = NULL;
a3cba2aa 1132 struct nfs_fattr *fattr = NULL;
1da177e4 1133 struct nfs_inode *nfsi = NFS_I(inode);
1da177e4 1134
1e8968c5
NV		 1135 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1136 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1da177e4 1137
f4ce1299
TM		 1138 trace_nfs_revalidate_inode_enter(inode);
1139
85233a7a 1140 if (is_bad_inode(inode))
691beb13 1141 goto out;
1da177e4 1142 if (NFS_STALE(inode))
412d582e 1143 goto out;
7fdc49c4 1144
ac46bd37
TM		 1145 /* pNFS: Attributes aren't updated until we layoutcommit */
1146 if (S_ISREG(inode->i_mode)) {
1147 status = pnfs_sync_inode(inode, false);
1148 if (status)
1149 goto out;
1150 }
1151
a3cba2aa
TM		 1152 status = -ENOMEM;
1153 fattr = nfs_alloc_fattr();
1154 if (fattr == NULL)
1155 goto out;
1156
691beb13 1157 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
14c43f76
DQ		 1158
1159 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1160 if (IS_ERR(label)) {
1161 status = PTR_ERR(label);
1162 goto out;
1163 }
1164
a841b54d
TM		 1165 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1166 label, inode);
1da177e4 1167 if (status != 0) {
1e8968c5 1168 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1da177e4 1169 inode->i_sb->s_id,
1e8968c5 1170 (unsigned long long)NFS_FILEID(inode), status);
c74dfe97
TM		 1171 switch (status) {
1172 case -ETIMEDOUT:
1173 /* A soft timeout occurred. Use cached information? */
1174 if (server->flags & NFS_MOUNT_SOFTREVAL)
1175 status = 0;
1176 break;
1177 case -ESTALE:
1da177e4 1178 if (!S_ISDIR(inode->i_mode))
93ce4af7
TM		 1179 nfs_set_inode_stale(inode);
1180 else
1181 nfs_zap_caches(inode);
1da177e4 1182 }
14c43f76 1183 goto err_out;
1da177e4
LT		 1184 }
1185
a3cba2aa 1186 status = nfs_refresh_inode(inode, fattr);
1da177e4 1187 if (status) {
1e8968c5 1188 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1da177e4 1189 inode->i_sb->s_id,
1e8968c5 1190 (unsigned long long)NFS_FILEID(inode), status);
14c43f76 1191 goto err_out;
1da177e4 1192 }
55296809 1193
24aa1fe6 1194 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
ada70d94 1195 nfs_zap_acl_cache(inode);
55296809 1196
3da580aa
JL		 1197 nfs_setsecurity(inode, fattr, label);
1198
1e8968c5 1199 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1da177e4 1200 inode->i_sb->s_id,
1e8968c5 1201 (unsigned long long)NFS_FILEID(inode));
1da177e4 1202
14c43f76
DQ		 1203err_out:
1204 nfs4_label_free(label);
1205out:
a3cba2aa 1206 nfs_free_fattr(fattr);
f4ce1299 1207 trace_nfs_revalidate_inode_exit(inode, status);
1da177e4
LT		 1208 return status;
1209}
1210
43f291cd 1211int nfs_attribute_cache_expired(struct inode *inode)
d7cf8dd0 1212{
b4d2314b 1213 if (nfs_have_delegated_attributes(inode))
1da177e4 1214 return 0;
d7cf8dd0 1215 return nfs_attribute_timeout(inode);
1da177e4
LT		 1216}
1217
1218/**
1219 * nfs_revalidate_inode - Revalidate the inode attributes
302fad7b
TM		 1220 * @server: pointer to nfs_server struct
1221 * @inode: pointer to inode struct
1da177e4
LT		 1222 *
1223 * Updates inode attribute information by retrieving the data from the server.
1224 */
1225int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1226{
311324ad 1227 if (!nfs_need_revalidate_inode(inode))
1da177e4
LT		 1228 return NFS_STALE(inode) ? -ESTALE : 0;
1229 return __nfs_revalidate_inode(server, inode);
1230}
1c606fb7 1231EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1da177e4 1232
1cda707d 1233static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
717d44e8
TM		 1234{
1235 struct nfs_inode *nfsi = NFS_I(inode);
f8806c84
TM		 1236 int ret;
1237
717d44e8 1238 if (mapping->nrpages != 0) {
f8806c84
TM		 1239 if (S_ISREG(inode->i_mode)) {
1240 ret = nfs_sync_mapping(mapping);
1241 if (ret < 0)
1242 return ret;
1243 }
1244 ret = invalidate_inode_pages2(mapping);
717d44e8
TM		 1245 if (ret < 0)
1246 return ret;
1247 }
d529ef83
JL		 1248 if (S_ISDIR(inode->i_mode)) {
1249 spin_lock(&inode->i_lock);
717d44e8 1250 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
d529ef83
JL		 1251 spin_unlock(&inode->i_lock);
1252 }
717d44e8 1253 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
de242c0b 1254 nfs_fscache_wait_on_invalidate(inode);
f4ce1299 1255
1e8968c5
NV		 1256 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1257 inode->i_sb->s_id,
1258 (unsigned long long)NFS_FILEID(inode));
717d44e8
TM		 1259 return 0;
1260}
1261
1cd9cb05 1262bool nfs_mapping_need_revalidate_inode(struct inode *inode)
b4b1eadf 1263{
61540bf6
TM		 1264 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1265 NFS_STALE(inode);
b4b1eadf
TM		 1266}
1267
0d0def49
AV		 1268int nfs_revalidate_mapping_rcu(struct inode *inode)
1269{
1270 struct nfs_inode *nfsi = NFS_I(inode);
1271 unsigned long *bitlock = &nfsi->flags;
1272 int ret = 0;
1273
1274 if (IS_SWAPFILE(inode))
1275 goto out;
1276 if (nfs_mapping_need_revalidate_inode(inode)) {
1277 ret = -ECHILD;
1278 goto out;
1279 }
1280 spin_lock(&inode->i_lock);
1281 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1282 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1283 ret = -ECHILD;
1284 spin_unlock(&inode->i_lock);
1285out:
1286 return ret;
1287}
1288
717d44e8 1289/**
be527494 1290 * nfs_revalidate_mapping - Revalidate the pagecache
302fad7b
TM		 1291 * @inode: pointer to host inode
1292 * @mapping: pointer to mapping
717d44e8 1293 */
be527494
TM		 1294int nfs_revalidate_mapping(struct inode *inode,
1295 struct address_space *mapping)
717d44e8
TM		 1296{
1297 struct nfs_inode *nfsi = NFS_I(inode);
d529ef83 1298 unsigned long *bitlock = &nfsi->flags;
717d44e8 1299 int ret = 0;
dc59250c 1300
29418aa4
MG		 1301 /* swapfiles are not supposed to be shared. */
1302 if (IS_SWAPFILE(inode))
1303 goto out;
1304
b4b1eadf 1305 if (nfs_mapping_need_revalidate_inode(inode)) {
717d44e8
TM		 1306 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1307 if (ret < 0)
1308 goto out;
7d52e862 1309 }
d529ef83
JL		 1310
1311 /*
1312 * We must clear NFS_INO_INVALID_DATA first to ensure that
1313 * invalidations that come in while we're shooting down the mappings
1314 * are respected. But, that leaves a race window where one revalidator
1315 * can clear the flag, and then another checks it before the mapping
1316 * gets invalidated. Fix that by serializing access to this part of
1317 * the function.
1318 *
1319 * At the same time, we need to allow other tasks to see whether we
1320 * might be in the middle of invalidating the pages, so we only set
1321 * the bit lock here if it looks like we're going to be doing that.
1322 */
1323 for (;;) {
74316201
N		 1324 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1325 nfs_wait_bit_killable, TASK_KILLABLE);
d529ef83
JL		 1326 if (ret)
1327 goto out;
17dfeb91
TM		 1328 spin_lock(&inode->i_lock);
1329 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1330 spin_unlock(&inode->i_lock);
1331 continue;
1332 }
1333 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
d529ef83 1334 break;
d529ef83 1335 spin_unlock(&inode->i_lock);
17dfeb91 1336 goto out;
f4ce1299
TM		 1337 }
1338
17dfeb91 1339 set_bit(NFS_INO_INVALIDATING, bitlock);
4db72b40 1340 smp_wmb();
1c341b77
TM		 1341 nfsi->cache_validity &= ~(NFS_INO_INVALID_DATA|
1342 NFS_INO_DATA_INVAL_DEFER);
17dfeb91
TM		 1343 spin_unlock(&inode->i_lock);
1344 trace_nfs_invalidate_mapping_enter(inode);
be527494 1345 ret = nfs_invalidate_mapping(inode, mapping);
17dfeb91
TM		 1346 trace_nfs_invalidate_mapping_exit(inode, ret);
1347
d529ef83 1348 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
4e857c58 1349 smp_mb__after_atomic();
d529ef83 1350 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
cd9ae2b6 1351out:
44b11874 1352 return ret;
7d52e862
TM		 1353}
1354
ca0daa27 1355static bool nfs_file_has_writers(struct nfs_inode *nfsi)
874f9463 1356{
ca0daa27
TM		 1357 struct inode *inode = &nfsi->vfs_inode;
1358
ca0daa27
TM		 1359 if (!S_ISREG(inode->i_mode))
1360 return false;
1361 if (list_empty(&nfsi->open_files))
1362 return false;
6ba0c4e5 1363 return inode_is_open_for_write(inode);
874f9463
TM		 1364}
1365
651b0e70 1366static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
874f9463 1367{
651b0e70 1368 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
874f9463
TM		 1369}
1370
783b194c 1371static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
a895b4a1 1372{
e86d5a02 1373 struct timespec64 ts;
95582b00 1374
9e6e70f8
TM		 1375 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1376 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
c472c07b 1377 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1eb5d98f 1378 inode_set_iversion_raw(inode, fattr->change_attr);
70ca8852 1379 if (S_ISDIR(inode->i_mode))
6edf9609 1380 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
0f44da51
FL		 1381 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1382 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
70ca8852 1383 }
a895b4a1 1384 /* If we have atomic WCC data, we may update some attributes */
e86d5a02 1385 ts = inode->i_ctime;
9e6e70f8
TM		 1386 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1387 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02
TM		 1388 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1389 inode->i_ctime = fattr->ctime;
27dc1cd3 1390 }
9e6e70f8 1391
e86d5a02 1392 ts = inode->i_mtime;
9e6e70f8
TM		 1393 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1394 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
e86d5a02
TM		 1395 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1396 inode->i_mtime = fattr->mtime;
27dc1cd3 1397 if (S_ISDIR(inode->i_mode))
6edf9609 1398 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
a895b4a1 1399 }
9e6e70f8
TM		 1400 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1401 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1402 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
a6b6d5b8 1403 && !nfs_have_writebacks(inode)) {
27dc1cd3 1404 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
27dc1cd3 1405 }
a895b4a1
TM		 1406}
1407
1da177e4 1408/**
33801147 1409 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
302fad7b
TM		 1410 * @inode: pointer to inode
1411 * @fattr: updated attributes
1da177e4
LT		 1412 *
1413 * Verifies the attribute cache. If we have just changed the attributes,
1414 * so that fattr carries weak cache consistency data, then it may
1415 * also update the ctime/mtime/change_attribute.
1416 */
33801147 1417static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1da177e4
LT		 1418{
1419 struct nfs_inode *nfsi = NFS_I(inode);
1420 loff_t cur_size, new_isize;
2a3f5fd4 1421 unsigned long invalid = 0;
e86d5a02 1422 struct timespec64 ts;
dc59250c 1423
4ebe83af 1424 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
01da47bd 1425 return 0;
4ebe83af 1426
eb3d8f42
TM		 1427 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1428 /* Only a mounted-on-fileid? Just exit */
1429 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1430 return 0;
ca62b9c3 1431 /* Has the inode gone and changed behind our back? */
eb3d8f42 1432 } else if (nfsi->fileid != fattr->fileid) {
7e10cc25
TM		 1433 /* Is this perhaps the mounted-on fileid? */
1434 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1435 nfsi->fileid == fattr->mounted_on_fileid)
1436 return 0;
cc89684c 1437 return -ESTALE;
7e10cc25 1438 }
9e6e70f8 1439 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
cc89684c 1440 return -ESTALE;
ca62b9c3 1441
7e10cc25 1442
651b0e70 1443 if (!nfs_file_has_buffered_writers(nfsi)) {
ca0daa27 1444 /* Verify a few of the more important attributes */
c472c07b 1445 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
16e14375
TM		 1446 invalid |= NFS_INO_INVALID_CHANGE
1447 | NFS_INO_REVAL_PAGECACHE;
1da177e4 1448
e86d5a02
TM		 1449 ts = inode->i_mtime;
1450 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
16e14375 1451 invalid |= NFS_INO_INVALID_MTIME;
ca62b9c3 1452
e86d5a02
TM		 1453 ts = inode->i_ctime;
1454 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
16e14375 1455 invalid |= NFS_INO_INVALID_CTIME;
ca0daa27
TM		 1456
1457 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1458 cur_size = i_size_read(inode);
1459 new_isize = nfs_size_to_loff_t(fattr->size);
1460 if (cur_size != new_isize)
16e14375
TM		 1461 invalid |= NFS_INO_INVALID_SIZE
1462 | NFS_INO_REVAL_PAGECACHE;
ca0daa27 1463 }
9e6e70f8 1464 }
1da177e4
LT		 1465
1466 /* Have any file permissions changed? */
9e6e70f8 1467 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
16e14375
TM		 1468 invalid |= NFS_INO_INVALID_ACCESS
1469 | NFS_INO_INVALID_ACL
1470 | NFS_INO_INVALID_OTHER;
9ff593c4 1471 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
16e14375
TM		 1472 invalid |= NFS_INO_INVALID_ACCESS
1473 | NFS_INO_INVALID_ACL
1474 | NFS_INO_INVALID_OTHER;
9ff593c4 1475 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
16e14375
TM		 1476 invalid |= NFS_INO_INVALID_ACCESS
1477 | NFS_INO_INVALID_ACL
1478 | NFS_INO_INVALID_OTHER;
1da177e4
LT		 1479
1480 /* Has the link count changed? */
9e6e70f8 1481 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
16e14375 1482 invalid |= NFS_INO_INVALID_OTHER;
1da177e4 1483
e86d5a02
TM		 1484 ts = inode->i_atime;
1485 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
2a3f5fd4
TM		 1486 invalid |= NFS_INO_INVALID_ATIME;
1487
1488 if (invalid != 0)
4ebe83af 1489 nfs_set_cache_invalid(inode, invalid);
1da177e4 1490
33801147 1491 nfsi->read_cache_jiffies = fattr->time_start;
1da177e4
LT		 1492 return 0;
1493}
1494
ae05f269 1495static atomic_long_t nfs_attr_generation_counter;
4704f0e2
TM		 1496
1497static unsigned long nfs_read_attr_generation_counter(void)
1498{
ae05f269 1499 return atomic_long_read(&nfs_attr_generation_counter);
4704f0e2
TM		 1500}
1501
1502unsigned long nfs_inc_attr_generation_counter(void)
1503{
ae05f269 1504 return atomic_long_inc_return(&nfs_attr_generation_counter);
4704f0e2 1505}
3235b403 1506EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
4704f0e2
TM		 1507
1508void nfs_fattr_init(struct nfs_fattr *fattr)
1509{
1510 fattr->valid = 0;
1511 fattr->time_start = jiffies;
1512 fattr->gencount = nfs_inc_attr_generation_counter();
6926afd1
TM		 1513 fattr->owner_name = NULL;
1514 fattr->group_name = NULL;
4704f0e2 1515}
ddda8e0a 1516EXPORT_SYMBOL_GPL(nfs_fattr_init);
4704f0e2 1517
140e049c
TM		 1518/**
1519 * nfs_fattr_set_barrier
1520 * @fattr: attributes
1521 *
1522 * Used to set a barrier after an attribute was updated. This
1523 * barrier ensures that older attributes from RPC calls that may
1524 * have raced with our update cannot clobber these new values.
1525 * Note that you are still responsible for ensuring that other
1526 * operations which change the attribute on the server do not
1527 * collide.
1528 */
1529void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1530{
1531 fattr->gencount = nfs_inc_attr_generation_counter();
1532}
1533
2d36bfde
TM		 1534struct nfs_fattr *nfs_alloc_fattr(void)
1535{
1536 struct nfs_fattr *fattr;
1537
1538 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1539 if (fattr != NULL)
1540 nfs_fattr_init(fattr);
1541 return fattr;
1542}
ddda8e0a 1543EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
2d36bfde
TM		 1544
1545struct nfs_fh *nfs_alloc_fhandle(void)
1546{
1547 struct nfs_fh *fh;
1548
1549 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1550 if (fh != NULL)
1551 fh->size = 0;
1552 return fh;
1553}
ddda8e0a 1554EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
2d36bfde 1555
e27d359e 1556#ifdef NFS_DEBUG
d8e0539e
WAA		 1557/*
1558 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1559 * in the same way that wireshark does
1560 *
1561 * @fh: file handle
1562 *
1563 * For debugging only.
1564 */
1565u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1566{
1567 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1568 * not on the result */
1264a2f0 1569 return nfs_fhandle_hash(fh);
d8e0539e 1570}
9e6ee76d 1571EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
d8e0539e
WAA		 1572
1573/*
20d27e92
CL		 1574 * _nfs_display_fhandle - display an NFS file handle on the console
1575 *
1576 * @fh: file handle to display
1577 * @caption: display caption
1578 *
1579 * For debugging only.
1580 */
20d27e92
CL		 1581void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1582{
1583 unsigned short i;
1584
fa68a1ba 1585 if (fh == NULL || fh->size == 0) {
20d27e92
CL		 1586 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1587 return;
1588 }
1589
d8e0539e
WAA		 1590 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1591 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
20d27e92
CL		 1592 for (i = 0; i < fh->size; i += 16) {
1593 __be32 *pos = (__be32 *)&fh->data[i];
1594
1595 switch ((fh->size - i - 1) >> 2) {
1596 case 0:
1597 printk(KERN_DEFAULT " %08x\n",
1598 be32_to_cpup(pos));
1599 break;
1600 case 1:
1601 printk(KERN_DEFAULT " %08x %08x\n",
1602 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1603 break;
1604 case 2:
1605 printk(KERN_DEFAULT " %08x %08x %08x\n",
1606 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1607 be32_to_cpup(pos + 2));
1608 break;
1609 default:
1610 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1611 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1612 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1613 }
1614 }
1615}
9e6ee76d 1616EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
20d27e92
CL		 1617#endif
1618
a10ad176
TM		 1619/**
1620 * nfs_inode_attrs_need_update - check if the inode attributes need updating
302fad7b
TM		 1621 * @inode: pointer to inode
1622 * @fattr: attributes
a10ad176
TM		 1623 *
1624 * Attempt to divine whether or not an RPC call reply carrying stale
1625 * attributes got scheduled after another call carrying updated ones.
1626 *
1627 * To do so, the function first assumes that a more recent ctime means
1628 * that the attributes in fattr are newer, however it also attempt to
1629 * catch the case where ctime either didn't change, or went backwards
1630 * (if someone reset the clock on the server) by looking at whether
1631 * or not this RPC call was started after the inode was last updated.
4704f0e2 1632 * Note also the check for wraparound of 'attr_gencount'
a10ad176
TM		 1633 *
1634 * The function returns 'true' if it thinks the attributes in 'fattr' are
1635 * more recent than the ones cached in the inode.
1636 *
1637 */
1638static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1639{
1640 const struct nfs_inode *nfsi = NFS_I(inode);
1641
4704f0e2 1642 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
4704f0e2 1643 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
a10ad176
TM		 1644}
1645
1646static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1647{
f4ce1299
TM		 1648 int ret;
1649
1650 trace_nfs_refresh_inode_enter(inode);
1651
a10ad176 1652 if (nfs_inode_attrs_need_update(inode, fattr))
f4ce1299
TM		 1653 ret = nfs_update_inode(inode, fattr);
1654 else
1655 ret = nfs_check_inode_attributes(inode, fattr);
1656
1657 trace_nfs_refresh_inode_exit(inode, ret);
1658 return ret;
870a5be8
TM		 1659}
1660
33801147
TM		 1661/**
1662 * nfs_refresh_inode - try to update the inode attribute cache
302fad7b
TM		 1663 * @inode: pointer to inode
1664 * @fattr: updated attributes
33801147
TM		 1665 *
1666 * Check that an RPC call that returned attributes has not overlapped with
1667 * other recent updates of the inode metadata, then decide whether it is
1668 * safe to do a full update of the inode attributes, or whether just to
1669 * call nfs_check_inode_attributes.
1670 */
1671int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1672{
33801147
TM		 1673 int status;
1674
1675 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1676 return 0;
1677 spin_lock(&inode->i_lock);
870a5be8 1678 status = nfs_refresh_inode_locked(inode, fattr);
33801147 1679 spin_unlock(&inode->i_lock);
ef79c097 1680
33801147
TM		 1681 return status;
1682}
ddda8e0a 1683EXPORT_SYMBOL_GPL(nfs_refresh_inode);
33801147 1684
16e14375
TM		 1685static int nfs_post_op_update_inode_locked(struct inode *inode,
1686 struct nfs_fattr *fattr, unsigned int invalid)
d65f557f 1687{
6edf9609
TM		 1688 if (S_ISDIR(inode->i_mode))
1689 invalid |= NFS_INO_INVALID_DATA;
1690 nfs_set_cache_invalid(inode, invalid);
d65f557f
TM		 1691 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1692 return 0;
1693 return nfs_refresh_inode_locked(inode, fattr);
1694}
1695
decf491f
TM		 1696/**
1697 * nfs_post_op_update_inode - try to update the inode attribute cache
302fad7b
TM		 1698 * @inode: pointer to inode
1699 * @fattr: updated attributes
decf491f
TM		 1700 *
1701 * After an operation that has changed the inode metadata, mark the
1702 * attribute cache as being invalid, then try to update it.
f551e44f
CL		 1703 *
1704 * NB: if the server didn't return any post op attributes, this
1705 * function will force the retrieval of attributes before the next
1706 * NFS request. Thus it should be used only for operations that
1707 * are expected to change one or more attributes, to avoid
1708 * unnecessary NFS requests and trips through nfs_update_inode().
decf491f
TM		 1709 */
1710int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1711{
d65f557f 1712 int status;
decf491f 1713
7668fdbe 1714 spin_lock(&inode->i_lock);
92d64e47 1715 nfs_fattr_set_barrier(fattr);
16e14375
TM		 1716 status = nfs_post_op_update_inode_locked(inode, fattr,
1717 NFS_INO_INVALID_CHANGE
d554168f
TM		 1718 | NFS_INO_INVALID_CTIME
1719 | NFS_INO_REVAL_FORCED);
7668fdbe 1720 spin_unlock(&inode->i_lock);
aa9c2669 1721
870a5be8 1722 return status;
decf491f 1723}
1c606fb7 1724EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
decf491f 1725
70ca8852 1726/**
a08a8cd3 1727 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
302fad7b
TM		 1728 * @inode: pointer to inode
1729 * @fattr: updated attributes
70ca8852
TM		 1730 *
1731 * After an operation that has changed the inode metadata, mark the
1732 * attribute cache as being invalid, then try to update it. Fake up
1733 * weak cache consistency data, if none exist.
1734 *
1735 * This function is mainly designed to be used by the ->write_done() functions.
1736 */
a08a8cd3 1737int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
70ca8852 1738{
d65f557f
TM		 1739 int status;
1740
d65f557f
TM		 1741 /* Don't do a WCC update if these attributes are already stale */
1742 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1743 !nfs_inode_attrs_need_update(inode, fattr)) {
9e6e70f8
TM		 1744 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1745 | NFS_ATTR_FATTR_PRESIZE
1746 | NFS_ATTR_FATTR_PREMTIME
1747 | NFS_ATTR_FATTR_PRECTIME);
d65f557f
TM		 1748 goto out_noforce;
1749 }
9e6e70f8
TM		 1750 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1751 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1eb5d98f 1752 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
9e6e70f8 1753 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
70ca8852 1754 }
9e6e70f8
TM		 1755 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1756 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
e86d5a02 1757 fattr->pre_ctime = inode->i_ctime;
9e6e70f8
TM		 1758 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1759 }
1760 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1761 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
e86d5a02 1762 fattr->pre_mtime = inode->i_mtime;
9e6e70f8
TM		 1763 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1764 }
1765 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1766 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
a3d01454 1767 fattr->pre_size = i_size_read(inode);
9e6e70f8 1768 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
70ca8852 1769 }
d65f557f 1770out_noforce:
16e14375
TM		 1771 status = nfs_post_op_update_inode_locked(inode, fattr,
1772 NFS_INO_INVALID_CHANGE
1773 | NFS_INO_INVALID_CTIME
3a39e778
ZB		 1774 | NFS_INO_INVALID_MTIME
1775 | NFS_INO_INVALID_BLOCKS);
a08a8cd3
TM		 1776 return status;
1777}
1778
1779/**
1780 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
302fad7b
TM		 1781 * @inode: pointer to inode
1782 * @fattr: updated attributes
a08a8cd3
TM		 1783 *
1784 * After an operation that has changed the inode metadata, mark the
1785 * attribute cache as being invalid, then try to update it. Fake up
1786 * weak cache consistency data, if none exist.
1787 *
1788 * This function is mainly designed to be used by the ->write_done() functions.
1789 */
1790int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1791{
1792 int status;
1793
1794 spin_lock(&inode->i_lock);
8f8ba1d7 1795 nfs_fattr_set_barrier(fattr);
a08a8cd3 1796 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
d65f557f
TM		 1797 spin_unlock(&inode->i_lock);
1798 return status;
70ca8852 1799}
ddda8e0a 1800EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
70ca8852 1801
ea96d1ec 1802
1da177e4
LT		 1803/*
1804 * Many nfs protocol calls return the new file attributes after
1805 * an operation. Here we update the inode to reflect the state
1806 * of the server's inode.
1807 *
1808 * This is a bit tricky because we have to make sure all dirty pages
1809 * have been sent off to the server before calling invalidate_inode_pages.
1810 * To make sure no other process adds more write requests while we try
1811 * our best to flush them, we make them sleep during the attribute refresh.
1812 *
1813 * A very similar scenario holds for the dir cache.
1814 */
24aa1fe6 1815static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1da177e4 1816{
8b4bdcf8 1817 struct nfs_server *server;
1da177e4 1818 struct nfs_inode *nfsi = NFS_I(inode);
951a143b 1819 loff_t cur_isize, new_isize;
2a3f5fd4 1820 unsigned long invalid = 0;
3e7d950a 1821 unsigned long now = jiffies;
62ab460c 1822 unsigned long save_cache_validity;
651b0e70 1823 bool have_writers = nfs_file_has_buffered_writers(nfsi);
944171cb 1824 bool cache_revalidated = true;
0b467264 1825 bool attr_changed = false;
c80d17c5 1826 bool have_delegation;
1da177e4 1827
1e8968c5 1828 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
3110ff80 1829 __func__, inode->i_sb->s_id, inode->i_ino,
4f1abd22 1830 nfs_display_fhandle_hash(NFS_FH(inode)),
1da177e4
LT		 1831 atomic_read(&inode->i_count), fattr->valid);
1832
eb3d8f42
TM		 1833 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1834 /* Only a mounted-on-fileid? Just exit */
1835 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1836 return 0;
7e10cc25 1837 /* Has the inode gone and changed behind our back? */
eb3d8f42 1838 } else if (nfsi->fileid != fattr->fileid) {
7e10cc25
TM		 1839 /* Is this perhaps the mounted-on fileid? */
1840 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1841 nfsi->fileid == fattr->mounted_on_fileid)
1842 return 0;
e73e6c9e
MT		 1843 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1844 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1845 NFS_SERVER(inode)->nfs_client->cl_hostname,
1846 inode->i_sb->s_id, (long long)nfsi->fileid,
1847 (long long)fattr->fileid);
1848 goto out_err;
1849 }
1da177e4
LT		 1850
1851 /*
1852 * Make sure the inode's type hasn't changed.
1853 */
e73e6c9e
MT		 1854 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1855 /*
1856 * Big trouble! The inode has become a different object.
1857 */
1e8968c5 1858 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
e73e6c9e
MT		 1859 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1860 goto out_err;
1861 }
1da177e4 1862
8b4bdcf8 1863 server = NFS_SERVER(inode);
a0356862 1864 /* Update the fsid? */
9e6e70f8 1865 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
c37dcd33 1866 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
36d43a43 1867 !IS_AUTOMOUNT(inode))
8b4bdcf8
TM		 1868 server->fsid = fattr->fsid;
1869
c80d17c5
TM		 1870 /* Save the delegation state before clearing cache_validity */
1871 have_delegation = nfs_have_delegated_attributes(inode);
1872
1da177e4
LT		 1873 /*
1874 * Update the read time so we don't revalidate too often.
1875 */
33801147 1876 nfsi->read_cache_jiffies = fattr->time_start;
3e7d950a 1877
62ab460c
TM		 1878 save_cache_validity = nfsi->cache_validity;
1879 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1880 | NFS_INO_INVALID_ATIME
1881 | NFS_INO_REVAL_FORCED
3a39e778
ZB		 1882 | NFS_INO_REVAL_PAGECACHE
1883 | NFS_INO_INVALID_BLOCKS);
1da177e4 1884
a895b4a1 1885 /* Do atomic weak cache consistency updates */
783b194c 1886 nfs_wcc_update_inode(inode, fattr);
a895b4a1 1887
944171cb
BC		 1888 if (pnfs_layoutcommit_outstanding(inode)) {
1889 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1890 cache_revalidated = false;
1891 }
10b7e9ad 1892
47aabaa7 1893 /* More cache consistency checks */
9e6e70f8 1894 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
c472c07b 1895 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
38512aa9 1896 /* Could it be a race with writeback? */
c80d17c5 1897 if (!(have_writers || have_delegation)) {
0b467264 1898 invalid |= NFS_INO_INVALID_DATA
38512aa9
TM		 1899 | NFS_INO_INVALID_ACCESS
1900 | NFS_INO_INVALID_ACL;
cac88f94 1901 /* Force revalidate of all attributes */
16e14375
TM		 1902 save_cache_validity |= NFS_INO_INVALID_CTIME
1903 | NFS_INO_INVALID_MTIME
1904 | NFS_INO_INVALID_SIZE
1905 | NFS_INO_INVALID_OTHER;
38512aa9
TM		 1906 if (S_ISDIR(inode->i_mode))
1907 nfs_force_lookup_revalidate(inode);
c80d17c5
TM		 1908 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1909 inode->i_sb->s_id,
1910 inode->i_ino);
1c341b77
TM		 1911 } else if (!have_delegation)
1912 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1eb5d98f 1913 inode_set_iversion_raw(inode, fattr->change_attr);
0b467264 1914 attr_changed = true;
9e6e70f8 1915 }
ade14a7d 1916 } else {
8619ddd0 1917 nfsi->cache_validity |= save_cache_validity &
16e14375 1918 (NFS_INO_INVALID_CHANGE
8619ddd0
TM		 1919 | NFS_INO_REVAL_PAGECACHE
1920 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1921 cache_revalidated = false;
1922 }
9e6e70f8
TM		 1923
1924 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
e86d5a02 1925 inode->i_mtime = fattr->mtime;
ade14a7d 1926 } else if (server->caps & NFS_CAP_MTIME) {
43b6535e 1927 nfsi->cache_validity |= save_cache_validity &
16e14375 1928 (NFS_INO_INVALID_MTIME
62ab460c 1929 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1930 cache_revalidated = false;
1931 }
62ab460c 1932
9e6e70f8 1933 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
e86d5a02 1934 inode->i_ctime = fattr->ctime;
ade14a7d 1935 } else if (server->caps & NFS_CAP_CTIME) {
43b6535e 1936 nfsi->cache_validity |= save_cache_validity &
16e14375 1937 (NFS_INO_INVALID_CTIME
62ab460c 1938 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1939 cache_revalidated = false;
1940 }
47aabaa7 1941
951a143b 1942 /* Check if our cached file size is stale */
9e6e70f8
TM		 1943 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1944 new_isize = nfs_size_to_loff_t(fattr->size);
1945 cur_isize = i_size_read(inode);
c80d17c5 1946 if (new_isize != cur_isize && !have_delegation) {
9e6e70f8
TM		 1947 /* Do we perhaps have any outstanding writes, or has
1948 * the file grown beyond our last write? */
a6b6d5b8 1949 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
9e6e70f8 1950 i_size_write(inode, new_isize);
ca0daa27 1951 if (!have_writers)
16e14375 1952 invalid |= NFS_INO_INVALID_DATA;
0b467264 1953 attr_changed = true;
9e6e70f8 1954 }
60c16ea8
HJ		 1955 dprintk("NFS: isize change on server for file %s/%ld "
1956 "(%Ld to %Ld)\n",
1957 inode->i_sb->s_id,
1958 inode->i_ino,
1959 (long long)cur_isize,
1960 (long long)new_isize);
1da177e4 1961 }
ade14a7d 1962 } else {
43b6535e 1963 nfsi->cache_validity |= save_cache_validity &
16e14375 1964 (NFS_INO_INVALID_SIZE
62ab460c
TM		 1965 | NFS_INO_REVAL_PAGECACHE
1966 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1967 cache_revalidated = false;
1968 }
1da177e4 1969
1da177e4 1970
9e6e70f8 1971 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
e86d5a02 1972 inode->i_atime = fattr->atime;
ade14a7d 1973 else if (server->caps & NFS_CAP_ATIME) {
43b6535e
TM		 1974 nfsi->cache_validity |= save_cache_validity &
1975 (NFS_INO_INVALID_ATIME
62ab460c 1976 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1977 cache_revalidated = false;
1978 }
1da177e4 1979
9e6e70f8
TM		 1980 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1981 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
9b4b3513
TM		 1982 umode_t newmode = inode->i_mode & S_IFMT;
1983 newmode |= fattr->mode & S_IALLUGO;
1984 inode->i_mode = newmode;
16e14375 1985 invalid |= NFS_INO_INVALID_ACCESS
0b467264
TM		 1986 | NFS_INO_INVALID_ACL;
1987 attr_changed = true;
9e6e70f8 1988 }
ade14a7d 1989 } else if (server->caps & NFS_CAP_MODE) {
43b6535e 1990 nfsi->cache_validity |= save_cache_validity &
0b467264 1991 (NFS_INO_INVALID_OTHER
62ab460c 1992 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1993 cache_revalidated = false;
1994 }
62ab460c 1995
9e6e70f8 1996 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
9ff593c4 1997 if (!uid_eq(inode->i_uid, fattr->uid)) {
16e14375 1998 invalid |= NFS_INO_INVALID_ACCESS
0b467264 1999 | NFS_INO_INVALID_ACL;
9e6e70f8 2000 inode->i_uid = fattr->uid;
0b467264 2001 attr_changed = true;
9e6e70f8 2002 }
ade14a7d 2003 } else if (server->caps & NFS_CAP_OWNER) {
43b6535e 2004 nfsi->cache_validity |= save_cache_validity &
0b467264 2005 (NFS_INO_INVALID_OTHER
62ab460c 2006 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2007 cache_revalidated = false;
2008 }
62ab460c 2009
9e6e70f8 2010 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
9ff593c4 2011 if (!gid_eq(inode->i_gid, fattr->gid)) {
16e14375 2012 invalid |= NFS_INO_INVALID_ACCESS
0b467264 2013 | NFS_INO_INVALID_ACL;
9e6e70f8 2014 inode->i_gid = fattr->gid;
0b467264 2015 attr_changed = true;
9e6e70f8 2016 }
ade14a7d 2017 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
43b6535e 2018 nfsi->cache_validity |= save_cache_validity &
0b467264 2019 (NFS_INO_INVALID_OTHER
62ab460c 2020 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2021 cache_revalidated = false;
2022 }
921615f1 2023
9e6e70f8
TM		 2024 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2025 if (inode->i_nlink != fattr->nlink) {
9e6e70f8
TM		 2026 if (S_ISDIR(inode->i_mode))
2027 invalid |= NFS_INO_INVALID_DATA;
bfe86848 2028 set_nlink(inode, fattr->nlink);
0b467264 2029 attr_changed = true;
9e6e70f8 2030 }
ade14a7d 2031 } else if (server->caps & NFS_CAP_NLINK) {
43b6535e 2032 nfsi->cache_validity |= save_cache_validity &
16e14375 2033 (NFS_INO_INVALID_OTHER
62ab460c 2034 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2035 cache_revalidated = false;
2036 }
1da177e4 2037
9e6e70f8 2038 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 2039 /*
2040 * report the blocks in 512byte units
2041 */
2042 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
ade14a7d 2043 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
9e6e70f8 2044 inode->i_blocks = fattr->du.nfs2.blocks;
3a39e778
ZB		 2045 else {
2046 nfsi->cache_validity |= save_cache_validity &
2047 (NFS_INO_INVALID_BLOCKS
2048 | NFS_INO_REVAL_FORCED);
ade14a7d 2049 cache_revalidated = false;
3a39e778 2050 }
1da177e4
LT		 2051
2052 /* Update attrtimeo value if we're out of the unstable period */
0b467264 2053 if (attr_changed) {
cac88f94 2054 invalid &= ~NFS_INO_INVALID_ATTR;
91d5b470 2055 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1da177e4 2056 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
3e7d950a 2057 nfsi->attrtimeo_timestamp = now;
f5062003 2058 /* Set barrier to be more recent than all outstanding updates */
4704f0e2 2059 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
6d2b2966 2060 } else {
ade14a7d
TM		 2061 if (cache_revalidated) {
2062 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2063 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2064 nfsi->attrtimeo <<= 1;
2065 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2066 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2067 }
6d2b2966
TM		 2068 nfsi->attrtimeo_timestamp = now;
2069 }
f5062003
TM		 2070 /* Set the barrier to be more recent than this fattr */
2071 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
2072 nfsi->attr_gencount = fattr->gencount;
1da177e4 2073 }
c812012f 2074
1da177e4
LT		 2075 /* Don't invalidate the data if we were to blame */
2076 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2077 || S_ISLNK(inode->i_mode)))
2078 invalid &= ~NFS_INO_INVALID_DATA;
c80d17c5 2079 nfs_set_cache_invalid(inode, invalid);
de242c0b 2080
1da177e4 2081 return 0;
b37b03b7 2082 out_err:
1da177e4
LT		 2083 /*
2084 * No need to worry about unhashing the dentry, as the
2085 * lookup validation will know that the inode is bad.
2086 * (But we fall through to invalidate the caches.)
2087 */
93ce4af7 2088 nfs_set_inode_stale_locked(inode);
1da177e4
LT		 2089 return -ESTALE;
2090}
2091
f7b422b1 2092struct inode *nfs_alloc_inode(struct super_block *sb)
1da177e4
LT		 2093{
2094 struct nfs_inode *nfsi;
c456aacf 2095 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1da177e4
LT		 2096 if (!nfsi)
2097 return NULL;
55296809
CL		 2098 nfsi->flags = 0UL;
2099 nfsi->cache_validity = 0UL;
89d77c8f 2100#if IS_ENABLED(CONFIG_NFS_V4)
e50a1c2e
BF		 2101 nfsi->nfs4_acl = NULL;
2102#endif /* CONFIG_NFS_V4 */
1da177e4
LT		 2103 return &nfsi->vfs_inode;
2104}
89d77c8f 2105EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1da177e4 2106
ca1a199e 2107void nfs_free_inode(struct inode *inode)
1da177e4
LT		 2108{
2109 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2110}
ca1a199e 2111EXPORT_SYMBOL_GPL(nfs_free_inode);
fa0d7e3d 2112
d75d5414
AM		 2113static inline void nfs4_init_once(struct nfs_inode *nfsi)
2114{
89d77c8f 2115#if IS_ENABLED(CONFIG_NFS_V4)
d75d5414
AM		 2116 INIT_LIST_HEAD(&nfsi->open_states);
2117 nfsi->delegation = NULL;
d75d5414 2118 init_rwsem(&nfsi->rwsem);
e5e94017 2119 nfsi->layout = NULL;
d75d5414
AM		 2120#endif
2121}
f7b422b1 2122
51cc5068 2123static void init_once(void *foo)
1da177e4
LT		 2124{
2125 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2126
a35afb83 2127 inode_init_once(&nfsi->vfs_inode);
a35afb83
CL		 2128 INIT_LIST_HEAD(&nfsi->open_files);
2129 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2130 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
ea2cf228 2131 INIT_LIST_HEAD(&nfsi->commit_info.list);
a6b6d5b8 2132 atomic_long_set(&nfsi->nrequests, 0);
5cb953d4 2133 atomic_long_set(&nfsi->commit_info.ncommit, 0);
1a0de48a 2134 atomic_set(&nfsi->commit_info.rpcs_out, 0);
884be175 2135 init_rwsem(&nfsi->rmdir_sem);
e824f99a 2136 mutex_init(&nfsi->commit_mutex);
a35afb83 2137 nfs4_init_once(nfsi);
efeda80d 2138 nfsi->cache_change_attribute = 0;
1da177e4 2139}
20c2df83 2140
f7b422b1 2141static int __init nfs_init_inodecache(void)
1da177e4
LT		 2142{
2143 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2144 sizeof(struct nfs_inode),
fffb60f9 2145 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 2146 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 2147 init_once);
1da177e4
LT		 2148 if (nfs_inode_cachep == NULL)
2149 return -ENOMEM;
2150
2151 return 0;
2152}
2153
266bee88 2154static void nfs_destroy_inodecache(void)
1da177e4 2155{
8c0a8537
KS		 2156 /*
2157 * Make sure all delayed rcu free inodes are flushed before we
2158 * destroy cache.
2159 */
2160 rcu_barrier();
1a1d92c1 2161 kmem_cache_destroy(nfs_inode_cachep);
1da177e4
LT		 2162}
2163
5746006f 2164struct workqueue_struct *nfsiod_workqueue;
89d77c8f 2165EXPORT_SYMBOL_GPL(nfsiod_workqueue);
5746006f
TM		 2166
2167/*
2168 * start up the nfsiod workqueue
2169 */
2170static int nfsiod_start(void)
2171{
2172 struct workqueue_struct *wq;
2173 dprintk("RPC: creating workqueue nfsiod\n");
ada609ee 2174 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
5746006f
TM		 2175 if (wq == NULL)
2176 return -ENOMEM;
2177 nfsiod_workqueue = wq;
2178 return 0;
2179}
2180
2181/*
2182 * Destroy the nfsiod workqueue
2183 */
2184static void nfsiod_stop(void)
2185{
2186 struct workqueue_struct *wq;
2187
2188 wq = nfsiod_workqueue;
2189 if (wq == NULL)
2190 return;
2191 nfsiod_workqueue = NULL;
2192 destroy_workqueue(wq);
2193}
2194
c7d03a00 2195unsigned int nfs_net_id;
9e2e74db 2196EXPORT_SYMBOL_GPL(nfs_net_id);
1b340d01
SK		 2197
2198static int nfs_net_init(struct net *net)
2199{
6b13168b 2200 nfs_clients_init(net);
65b38851 2201 return nfs_fs_proc_net_init(net);
1b340d01
SK		 2202}
2203
2204static void nfs_net_exit(struct net *net)
2205{
65b38851 2206 nfs_fs_proc_net_exit(net);
10b7a70c 2207 nfs_clients_exit(net);
1b340d01
SK		 2208}
2209
2210static struct pernet_operations nfs_net_ops = {
2211 .init = nfs_net_init,
2212 .exit = nfs_net_exit,
2213 .id = &nfs_net_id,
2214 .size = sizeof(struct nfs_net),
2215};
2216
1da177e4
LT		 2217/*
2218 * Initialize NFS
2219 */
2220static int __init init_nfs_fs(void)
2221{
2222 int err;
2223
996bc4f4
TM		 2224 err = nfs_sysfs_init();
2225 if (err < 0)
2226 goto out10;
2227
1b340d01 2228 err = register_pernet_subsys(&nfs_net_ops);
e571cbf1 2229 if (err < 0)
89d77c8f 2230 goto out9;
e571cbf1 2231
8ec442ae
DH		 2232 err = nfs_fscache_register();
2233 if (err < 0)
89d77c8f 2234 goto out8;
8ec442ae 2235
5746006f
TM		 2236 err = nfsiod_start();
2237 if (err)
89d77c8f 2238 goto out7;
5746006f 2239
6aaca566
DH		 2240 err = nfs_fs_proc_init();
2241 if (err)
89d77c8f 2242 goto out6;
6aaca566 2243
1da177e4
LT		 2244 err = nfs_init_nfspagecache();
2245 if (err)
89d77c8f 2246 goto out5;
1da177e4
LT		 2247
2248 err = nfs_init_inodecache();
2249 if (err)
89d77c8f 2250 goto out4;
1da177e4
LT		 2251
2252 err = nfs_init_readpagecache();
2253 if (err)
89d77c8f 2254 goto out3;
1da177e4
LT		 2255
2256 err = nfs_init_writepagecache();
2257 if (err)
89d77c8f 2258 goto out2;
1da177e4 2259
1da177e4
LT		 2260 err = nfs_init_directcache();
2261 if (err)
89d77c8f 2262 goto out1;
1da177e4 2263
ec7652aa 2264 rpc_proc_register(&init_net, &nfs_rpcstat);
cd738ee9
KM		 2265
2266 err = register_nfs_fs();
2267 if (err)
129d1977
BS		 2268 goto out0;
2269
1da177e4 2270 return 0;
129d1977 2271out0:
ec7652aa 2272 rpc_proc_unregister(&init_net, "nfs");
1da177e4 2273 nfs_destroy_directcache();
89d77c8f 2274out1:
129d1977 2275 nfs_destroy_writepagecache();
89d77c8f 2276out2:
129d1977 2277 nfs_destroy_readpagecache();
89d77c8f 2278out3:
129d1977 2279 nfs_destroy_inodecache();
89d77c8f 2280out4:
129d1977 2281 nfs_destroy_nfspagecache();
89d77c8f 2282out5:
129d1977 2283 nfs_fs_proc_exit();
89d77c8f 2284out6:
129d1977 2285 nfsiod_stop();
89d77c8f 2286out7:
129d1977 2287 nfs_fscache_unregister();
89d77c8f 2288out8:
129d1977 2289 unregister_pernet_subsys(&nfs_net_ops);
89d77c8f 2290out9:
996bc4f4
TM		 2291 nfs_sysfs_exit();
2292out10:
1da177e4
LT		 2293 return err;
2294}
2295
2296static void __exit exit_nfs_fs(void)
2297{
1da177e4 2298 nfs_destroy_directcache();
1da177e4
LT		 2299 nfs_destroy_writepagecache();
2300 nfs_destroy_readpagecache();
2301 nfs_destroy_inodecache();
2302 nfs_destroy_nfspagecache();
8ec442ae 2303 nfs_fscache_unregister();
1b340d01 2304 unregister_pernet_subsys(&nfs_net_ops);
ec7652aa 2305 rpc_proc_unregister(&init_net, "nfs");
f7b422b1 2306 unregister_nfs_fs();
6aaca566 2307 nfs_fs_proc_exit();
5746006f 2308 nfsiod_stop();
996bc4f4 2309 nfs_sysfs_exit();
1da177e4
LT		 2310}
2311
2312/* Not quite true; I just maintain it */
2313MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2314MODULE_LICENSE("GPL");
f43bf0be 2315module_param(enable_ino64, bool, 0644);
1da177e4
LT		 2316
2317module_init(init_nfs_fs)
2318module_exit(exit_nfs_fs)
Linux 6.x block layer and io_uring tree(s)