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NFSv4.2: Always flush out writes in nfs42_proc_fallocate()
[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
848fdd62
TM		 198#ifdef CONFIG_NFS_V4_2
199static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
200{
201 return nfsi->xattr_cache != NULL;
202}
203#else
204static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
205{
206 return false;
207}
208#endif
209
fd6d3fee 210void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
6edf9609
TM		 211{
212 struct nfs_inode *nfsi = NFS_I(inode);
3f0b3cf4
TM		 213 bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
214
215 if (have_delegation) {
216 if (!(flags & NFS_INO_REVAL_FORCED))
217 flags &= ~NFS_INO_INVALID_OTHER;
218 flags &= ~(NFS_INO_INVALID_CHANGE
219 | NFS_INO_INVALID_SIZE
0f44da51
FL		 220 | NFS_INO_REVAL_PAGECACHE
221 | NFS_INO_INVALID_XATTR);
3f0b3cf4 222 }
6edf9609 223
848fdd62
TM		 224 if (!nfs_has_xattr_cache(nfsi))
225 flags &= ~NFS_INO_INVALID_XATTR;
beab450d
TM		 226 if (flags & NFS_INO_INVALID_DATA)
227 nfs_fscache_invalidate(inode);
6edf9609 228 if (inode->i_mapping->nrpages == 0)
1c341b77 229 flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER);
6edf9609 230 nfsi->cache_validity |= flags;
6edf9609 231}
b6f80a2e 232EXPORT_SYMBOL_GPL(nfs_set_cache_invalid);
6edf9609 233
1da177e4
LT		 234/*
235 * Invalidate the local caches
236 */
b37b03b7 237static void nfs_zap_caches_locked(struct inode *inode)
1da177e4
LT		 238{
239 struct nfs_inode *nfsi = NFS_I(inode);
240 int mode = inode->i_mode;
241
91d5b470
CL		 242 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
243
c7c20973
TM		 244 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
245 nfsi->attrtimeo_timestamp = jiffies;
1da177e4 246
de242c0b 247 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
6edf9609 248 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 249 | NFS_INO_INVALID_DATA
250 | NFS_INO_INVALID_ACCESS
251 | NFS_INO_INVALID_ACL
95ad37f9 252 | NFS_INO_INVALID_XATTR
6edf9609 253 | NFS_INO_REVAL_PAGECACHE);
aa9c2669 254 } else
6edf9609 255 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 256 | NFS_INO_INVALID_ACCESS
257 | NFS_INO_INVALID_ACL
95ad37f9 258 | NFS_INO_INVALID_XATTR
6edf9609 259 | NFS_INO_REVAL_PAGECACHE);
fd1defc2 260 nfs_zap_label_cache_locked(nfsi);
b37b03b7 261}
dc59250c 262
b37b03b7
TM		 263void nfs_zap_caches(struct inode *inode)
264{
265 spin_lock(&inode->i_lock);
266 nfs_zap_caches_locked(inode);
dc59250c 267 spin_unlock(&inode->i_lock);
ada70d94
TM		 268}
269
cd9ae2b6
TM		 270void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
271{
272 if (mapping->nrpages != 0) {
273 spin_lock(&inode->i_lock);
6edf9609 274 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
cd9ae2b6
TM		 275 spin_unlock(&inode->i_lock);
276 }
277}
278
f41f7418 279void nfs_zap_acl_cache(struct inode *inode)
ada70d94
TM		 280{
281 void (*clear_acl_cache)(struct inode *);
282
283 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
284 if (clear_acl_cache != NULL)
285 clear_acl_cache(inode);
dc59250c 286 spin_lock(&inode->i_lock);
55296809 287 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
dc59250c 288 spin_unlock(&inode->i_lock);
1da177e4 289}
1c606fb7 290EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
1da177e4 291
c4812998
TM		 292void nfs_invalidate_atime(struct inode *inode)
293{
294 spin_lock(&inode->i_lock);
6edf9609 295 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
c4812998
TM		 296 spin_unlock(&inode->i_lock);
297}
ddda8e0a 298EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
c4812998 299
1da177e4 300/*
b37b03b7
TM		 301 * Invalidate, but do not unhash, the inode.
302 * NB: must be called with inode->i_lock held!
1da177e4 303 */
93ce4af7 304static void nfs_set_inode_stale_locked(struct inode *inode)
1da177e4 305{
3a10c30a 306 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
b37b03b7 307 nfs_zap_caches_locked(inode);
93ce4af7
TM		 308 trace_nfs_set_inode_stale(inode);
309}
310
311void nfs_set_inode_stale(struct inode *inode)
312{
313 spin_lock(&inode->i_lock);
314 nfs_set_inode_stale_locked(inode);
315 spin_unlock(&inode->i_lock);
1da177e4
LT		 316}
317
318struct nfs_find_desc {
319 struct nfs_fh *fh;
320 struct nfs_fattr *fattr;
321};
322
323/*
324 * In NFSv3 we can have 64bit inode numbers. In order to support
325 * this, and re-exported directories (also seen in NFSv2)
326 * we are forced to allow 2 different inodes to have the same
327 * i_ino.
328 */
329static int
330nfs_find_actor(struct inode *inode, void *opaque)
331{
332 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
333 struct nfs_fh *fh = desc->fh;
334 struct nfs_fattr *fattr = desc->fattr;
335
336 if (NFS_FILEID(inode) != fattr->fileid)
337 return 0;
f6488c9b
JL		 338 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
339 return 0;
1da177e4
LT		 340 if (nfs_compare_fh(NFS_FH(inode), fh))
341 return 0;
342 if (is_bad_inode(inode) || NFS_STALE(inode))
343 return 0;
344 return 1;
345}
346
347static int
348nfs_init_locked(struct inode *inode, void *opaque)
349{
350 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
351 struct nfs_fattr *fattr = desc->fattr;
352
99fadcd7 353 set_nfs_fileid(inode, fattr->fileid);
916ec34d 354 inode->i_mode = fattr->mode;
1da177e4
LT		 355 nfs_copy_fh(NFS_FH(inode), desc->fh);
356 return 0;
357}
358
e058f70b 359#ifdef CONFIG_NFS_V4_SECURITY_LABEL
fd1defc2
TM		 360static void nfs_clear_label_invalid(struct inode *inode)
361{
362 spin_lock(&inode->i_lock);
363 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
364 spin_unlock(&inode->i_lock);
365}
366
aa9c2669
DQ		 367void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
368 struct nfs4_label *label)
369{
370 int error;
371
372 if (label == NULL)
373 return;
374
aa9c2669
DQ		 375 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
376 error = security_inode_notifysecctx(inode, label->label,
377 label->len);
378 if (error)
379 printk(KERN_ERR "%s() %s %d "
380 "security_inode_notifysecctx() %d\n",
381 __func__,
382 (char *)label->label,
383 label->len, error);
fd1defc2 384 nfs_clear_label_invalid(inode);
aa9c2669
DQ		 385 }
386}
387
e058f70b
SD		 388struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
389{
390 struct nfs4_label *label = NULL;
391 int minor_version = server->nfs_client->cl_minorversion;
392
393 if (minor_version < 2)
394 return label;
395
396 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
397 return label;
398
399 label = kzalloc(sizeof(struct nfs4_label), flags);
400 if (label == NULL)
401 return ERR_PTR(-ENOMEM);
402
403 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
404 if (label->label == NULL) {
405 kfree(label);
406 return ERR_PTR(-ENOMEM);
407 }
408 label->len = NFS4_MAXLABELLEN;
409
410 return label;
411}
412EXPORT_SYMBOL_GPL(nfs4_label_alloc);
aa9c2669 413#else
829e57d7 414void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
aa9c2669
DQ		 415 struct nfs4_label *label)
416{
417}
e058f70b 418#endif
aa9c2669 419EXPORT_SYMBOL_GPL(nfs_setsecurity);
e058f70b 420
f174ff7a
PT		 421/* Search for inode identified by fh, fileid and i_mode in inode cache. */
422struct inode *
423nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
424{
425 struct nfs_find_desc desc = {
426 .fh = fh,
427 .fattr = fattr,
428 };
429 struct inode *inode;
430 unsigned long hash;
431
432 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
433 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
434 return NULL;
435
436 hash = nfs_fattr_to_ino_t(fattr);
437 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
438
439 dprintk("%s: returning %p\n", __func__, inode);
440 return inode;
441}
442
1da177e4
LT		 443/*
444 * This is our front-end to iget that looks up inodes by file handle
445 * instead of inode number.
446 */
447struct inode *
1775fd3e 448nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
1da177e4
LT		 449{
450 struct nfs_find_desc desc = {
451 .fh = fh,
452 .fattr = fattr
453 };
03f28e3a 454 struct inode *inode = ERR_PTR(-ENOENT);
1da177e4
LT		 455 unsigned long hash;
456
7ebb9315
BS		 457 nfs_attr_check_mountpoint(sb, fattr);
458
2ef47eb1
AS		 459 if (nfs_attr_use_mounted_on_fileid(fattr))
460 fattr->fileid = fattr->mounted_on_fileid;
461 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
1da177e4 462 goto out_no_inode;
9e6e70f8 463 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
1da177e4 464 goto out_no_inode;
1da177e4
LT		 465
466 hash = nfs_fattr_to_ino_t(fattr);
467
03f28e3a
TM		 468 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
469 if (inode == NULL) {
470 inode = ERR_PTR(-ENOMEM);
1da177e4 471 goto out_no_inode;
03f28e3a 472 }
1da177e4
LT		 473
474 if (inode->i_state & I_NEW) {
475 struct nfs_inode *nfsi = NFS_I(inode);
b0c4fddc 476 unsigned long now = jiffies;
1da177e4
LT		 477
478 /* We set i_ino for the few things that still rely on it,
479 * such as stat(2) */
480 inode->i_ino = hash;
481
482 /* We can't support update_atime(), since the server will reset it */
483 inode->i_flags |= S_NOATIME|S_NOCMTIME;
484 inode->i_mode = fattr->mode;
821a868a 485 nfsi->cache_validity = 0;
62ab460c
TM		 486 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
487 && nfs_server_capable(inode, NFS_CAP_MODE))
16e14375 488 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
1da177e4
LT		 489 /* Why so? Because we want revalidate for devices/FIFOs, and
490 * that's precisely what we have in nfs_file_inode_operations.
491 */
8fa5c000 492 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
1da177e4 493 if (S_ISREG(inode->i_mode)) {
1788ea6e 494 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
1da177e4 495 inode->i_data.a_ops = &nfs_file_aops;
1da177e4 496 } else if (S_ISDIR(inode->i_mode)) {
8fa5c000 497 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
1da177e4 498 inode->i_fop = &nfs_dir_operations;
11de3b11 499 inode->i_data.a_ops = &nfs_dir_aops;
55a97593 500 /* Deal with crossing mountpoints */
7ebb9315
BS		 501 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
502 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
6b97fd3d
MN		 503 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
504 inode->i_op = &nfs_referral_inode_operations;
505 else
506 inode->i_op = &nfs_mountpoint_inode_operations;
55a97593 507 inode->i_fop = NULL;
36d43a43 508 inode->i_flags |= S_AUTOMOUNT;
55a97593 509 }
21fc61c7 510 } else if (S_ISLNK(inode->i_mode)) {
1da177e4 511 inode->i_op = &nfs_symlink_inode_operations;
21fc61c7
AV		 512 inode_nohighmem(inode);
513 } else
1da177e4
LT		 514 init_special_inode(inode, inode->i_mode, fattr->rdev);
515
9e6e70f8
TM		 516 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
517 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
518 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
1eb5d98f 519 inode_set_iversion_raw(inode, 0);
9e6e70f8 520 inode->i_size = 0;
6d6b77f1 521 clear_nlink(inode);
9ff593c4
EB		 522 inode->i_uid = make_kuid(&init_user_ns, -2);
523 inode->i_gid = make_kgid(&init_user_ns, -2);
9e6e70f8
TM		 524 inode->i_blocks = 0;
525 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
2701d086
AA		 526 nfsi->write_io = 0;
527 nfsi->read_io = 0;
9e6e70f8 528
33801147 529 nfsi->read_cache_jiffies = fattr->time_start;
4704f0e2 530 nfsi->attr_gencount = fattr->gencount;
9e6e70f8 531 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
e86d5a02 532 inode->i_atime = fattr->atime;
62ab460c 533 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
16e14375 534 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
9e6e70f8 535 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
e86d5a02 536 inode->i_mtime = fattr->mtime;
62ab460c 537 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
16e14375 538 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
9e6e70f8 539 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 540 inode->i_ctime = fattr->ctime;
62ab460c 541 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
16e14375 542 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
9e6e70f8 543 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1eb5d98f 544 inode_set_iversion_raw(inode, fattr->change_attr);
cd812599 545 else
16e14375 546 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
9e6e70f8
TM		 547 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
548 inode->i_size = nfs_size_to_loff_t(fattr->size);
62ab460c 549 else
16e14375 550 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
9e6e70f8 551 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
bfe86848 552 set_nlink(inode, fattr->nlink);
62ab460c 553 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
16e14375 554 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 555 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
556 inode->i_uid = fattr->uid;
62ab460c 557 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
16e14375 558 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 559 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
560 inode->i_gid = fattr->gid;
62ab460c 561 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
16e14375 562 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
0f44da51
FL		 563 if (nfs_server_capable(inode, NFS_CAP_XATTR))
564 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
9e6e70f8
TM		 565 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
566 inode->i_blocks = fattr->du.nfs2.blocks;
567 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 568 /*
569 * report the blocks in 512byte units
570 */
571 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1da177e4 572 }
aa9c2669 573
821a868a
TM		 574 if (nfsi->cache_validity != 0)
575 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
576
aa9c2669
DQ		 577 nfs_setsecurity(inode, fattr, label);
578
1da177e4 579 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
b0c4fddc 580 nfsi->attrtimeo_timestamp = now;
1c3c07e9 581 nfsi->access_cache = RB_ROOT;
1da177e4 582
f1fe29b4 583 nfs_fscache_init_inode(inode);
ef79c097 584
1da177e4 585 unlock_new_inode(inode);
26fde4df
N		 586 } else {
587 int err = nfs_refresh_inode(inode, fattr);
588 if (err < 0) {
589 iput(inode);
590 inode = ERR_PTR(err);
591 goto out_no_inode;
592 }
593 }
1e8968c5 594 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
1da177e4 595 inode->i_sb->s_id,
1e8968c5 596 (unsigned long long)NFS_FILEID(inode),
4f1abd22 597 nfs_display_fhandle_hash(fh),
1da177e4
LT		 598 atomic_read(&inode->i_count));
599
600out:
601 return inode;
602
603out_no_inode:
03f28e3a 604 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
1da177e4
LT		 605 goto out;
606}
89d77c8f 607EXPORT_SYMBOL_GPL(nfs_fhget);
1da177e4 608
536e43d1 609#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		 610
611int
549c7297
CB		 612nfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
613 struct iattr *attr)
1da177e4 614{
2b0143b5 615 struct inode *inode = d_inode(dentry);
987f8dfc 616 struct nfs_fattr *fattr;
ae57ca0f 617 int error = 0;
1da177e4 618
91d5b470
CL		 619 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
620
188b95dd
JL		 621 /* skip mode change if it's just for clearing setuid/setgid */
622 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
623 attr->ia_valid &= ~ATTR_MODE;
624
1da177e4 625 if (attr->ia_valid & ATTR_SIZE) {
08a899d5
CH		 626 BUG_ON(!S_ISREG(inode->i_mode));
627
ae57ca0f
KM		 628 error = inode_newsize_ok(inode, attr->ia_size);
629 if (error)
630 return error;
631
632 if (attr->ia_size == i_size_read(inode))
1da177e4
LT		 633 attr->ia_valid &= ~ATTR_SIZE;
634 }
635
636 /* Optimization: if the end result is no change, don't RPC */
637 attr->ia_valid &= NFS_VALID_ATTRS;
536e43d1 638 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
1da177e4
LT		 639 return 0;
640
f4ce1299
TM		 641 trace_nfs_setattr_enter(inode);
642
755c1e20 643 /* Write all dirty data */
4d346bea
TM		 644 if (S_ISREG(inode->i_mode))
645 nfs_sync_inode(inode);
987f8dfc
TM		 646
647 fattr = nfs_alloc_fattr();
ae57ca0f
KM		 648 if (fattr == NULL) {
649 error = -ENOMEM;
987f8dfc 650 goto out;
ae57ca0f
KM		 651 }
652
987f8dfc 653 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
65e4308d 654 if (error == 0)
aa9c2669 655 error = nfs_refresh_inode(inode, fattr);
987f8dfc
TM		 656 nfs_free_fattr(fattr);
657out:
f4ce1299 658 trace_nfs_setattr_exit(inode, error);
65e4308d
TM		 659 return error;
660}
ddda8e0a 661EXPORT_SYMBOL_GPL(nfs_setattr);
65e4308d 662
a3d01454
TM		 663/**
664 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
665 * @inode: inode of the file used
666 * @offset: file offset to start truncating
667 *
668 * This is a copy of the common vmtruncate, but with the locking
669 * corrected to take into account the fact that NFS requires
670 * inode->i_size to be updated under the inode->i_lock.
f044636d 671 * Note: must be called with inode->i_lock held!
a3d01454
TM		 672 */
673static int nfs_vmtruncate(struct inode * inode, loff_t offset)
674{
c08d3b0e 675 int err;
a3d01454 676
c08d3b0e 677 err = inode_newsize_ok(inode, offset);
678 if (err)
679 goto out;
a3d01454 680
c08d3b0e 681 i_size_write(inode, offset);
6edf9609
TM		 682 /* Optimisation */
683 if (offset == 0)
1c341b77
TM		 684 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA |
685 NFS_INO_DATA_INVAL_DEFER);
f6cdfa6d 686 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
c08d3b0e 687
f044636d 688 spin_unlock(&inode->i_lock);
7caef267 689 truncate_pagecache(inode, offset);
f044636d 690 spin_lock(&inode->i_lock);
c08d3b0e 691out:
692 return err;
a3d01454
TM		 693}
694
65e4308d
TM		 695/**
696 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
697 * @inode: pointer to struct inode
698 * @attr: pointer to struct iattr
16e14375 699 * @fattr: pointer to struct nfs_fattr
65e4308d
TM		 700 *
701 * Note: we do this in the *proc.c in order to ensure that
702 * it works for things like exclusive creates too.
703 */
f044636d
TM		 704void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
705 struct nfs_fattr *fattr)
65e4308d 706{
f044636d
TM		 707 /* Barrier: bump the attribute generation count. */
708 nfs_fattr_set_barrier(fattr);
709
710 spin_lock(&inode->i_lock);
711 NFS_I(inode)->attr_gencount = fattr->gencount;
6a97d02d
TM		 712 if ((attr->ia_valid & ATTR_SIZE) != 0) {
713 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
714 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
715 nfs_vmtruncate(inode, attr->ia_size);
716 }
65e4308d 717 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
6a97d02d 718 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
1da177e4 719 if ((attr->ia_valid & ATTR_MODE) != 0) {
65e4308d
TM		 720 int mode = attr->ia_mode & S_IALLUGO;
721 mode |= inode->i_mode & ~S_IALLUGO;
1da177e4
LT		 722 inode->i_mode = mode;
723 }
724 if ((attr->ia_valid & ATTR_UID) != 0)
725 inode->i_uid = attr->ia_uid;
726 if ((attr->ia_valid & ATTR_GID) != 0)
727 inode->i_gid = attr->ia_gid;
6a97d02d 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);
6edf9609
TM		 733 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
734 | NFS_INO_INVALID_ACL);
65e4308d 735 }
6a97d02d
TM		 736 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
737 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
738 | NFS_INO_INVALID_CTIME);
739 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
e86d5a02 740 inode->i_atime = fattr->atime;
6a97d02d
TM		 741 else if (attr->ia_valid & ATTR_ATIME_SET)
742 inode->i_atime = attr->ia_atime;
743 else
744 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
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);
751 }
752 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
753 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
754 | NFS_INO_INVALID_CTIME);
755 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
e86d5a02 756 inode->i_mtime = fattr->mtime;
6a97d02d
TM		 757 else if (attr->ia_valid & ATTR_MTIME_SET)
758 inode->i_mtime = attr->ia_mtime;
759 else
760 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
761
762 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 763 inode->i_ctime = fattr->ctime;
6a97d02d
TM		 764 else
765 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
766 | NFS_INO_INVALID_CTIME);
65e4308d 767 }
616c3196
JL		 768 if (fattr->valid)
769 nfs_update_inode(inode, fattr);
f044636d 770 spin_unlock(&inode->i_lock);
1da177e4 771}
ddda8e0a 772EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
1da177e4 773
1bcf4c5c 774static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
311324ad
TM		 775{
776 struct dentry *parent;
777
1bcf4c5c
TM		 778 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
779 return;
311324ad 780 parent = dget_parent(dentry);
2b0143b5 781 nfs_force_use_readdirplus(d_inode(parent));
311324ad
TM		 782 dput(parent);
783}
784
1bcf4c5c
TM		 785static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
786{
787 struct dentry *parent;
788
789 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
790 return;
791 parent = dget_parent(dentry);
792 nfs_advise_use_readdirplus(d_inode(parent));
793 dput(parent);
794}
795
311324ad
TM		 796static bool nfs_need_revalidate_inode(struct inode *inode)
797{
798 if (NFS_I(inode)->cache_validity &
799 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
800 return true;
801 if (nfs_attribute_cache_expired(inode))
802 return true;
803 return false;
804}
805
549c7297
CB		 806int nfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
807 struct kstat *stat, u32 request_mask, unsigned int query_flags)
1da177e4 808{
a528d35e 809 struct inode *inode = d_inode(path->dentry);
9ccee940
TM		 810 struct nfs_server *server = NFS_SERVER(inode);
811 unsigned long cache_validity;
16caf5b6 812 int err = 0;
9ccee940
TM		 813 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
814 bool do_update = false;
1da177e4 815
f4ce1299 816 trace_nfs_getattr_enter(inode);
9ccee940 817
ac7cbb22
TM		 818 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
819 nfs_readdirplus_parent_cache_hit(path->dentry);
9ccee940 820 goto out_no_update;
ac7cbb22 821 }
9ccee940 822
acdc53b2 823 /* Flush out writes to the server in order to update c/mtime. */
9ccee940
TM		 824 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
825 S_ISREG(inode->i_mode)) {
79566ef0 826 err = filemap_write_and_wait(inode->i_mapping);
acdc53b2
TM		 827 if (err)
828 goto out;
28c494c5 829 }
fc33a7bb
CH		 830
831 /*
832 * We may force a getattr if the user cares about atime.
833 *
834 * Note that we only have to check the vfsmount flags here:
835 * - NFS always sets S_NOATIME by so checking it would give a
836 * bogus result
1751e8a6 837 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
fc33a7bb
CH		 838 * no point in checking those.
839 */
a528d35e
DH		 840 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
841 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
9ccee940
TM		 842 request_mask &= ~STATX_ATIME;
843
844 /* Is the user requesting attributes that might need revalidation? */
845 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
846 STATX_MTIME|STATX_UID|STATX_GID|
847 STATX_SIZE|STATX_BLOCKS)))
848 goto out_no_revalidate;
849
850 /* Check whether the cached attributes are stale */
851 do_update |= force_sync || nfs_attribute_cache_expired(inode);
852 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
853 do_update |= cache_validity &
854 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
855 if (request_mask & STATX_ATIME)
856 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
857 if (request_mask & (STATX_CTIME|STATX_MTIME))
858 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
3a39e778
ZB		 859 if (request_mask & STATX_BLOCKS)
860 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
9ccee940
TM		 861 if (do_update) {
862 /* Update the attribute cache */
59b86d85
HT		 863 if (!(server->flags & NFS_MOUNT_NOAC))
864 nfs_readdirplus_parent_cache_miss(path->dentry);
865 else
866 nfs_readdirplus_parent_cache_hit(path->dentry);
311324ad 867 err = __nfs_revalidate_inode(server, inode);
9ccee940
TM		 868 if (err)
869 goto out;
1bcf4c5c 870 } else
a528d35e 871 nfs_readdirplus_parent_cache_hit(path->dentry);
9ccee940
TM		 872out_no_revalidate:
873 /* Only return attributes that were revalidated. */
874 stat->result_mask &= request_mask;
875out_no_update:
0d56a451 876 generic_fillattr(&init_user_ns, inode, stat);
9ccee940
TM		 877 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
878 if (S_ISDIR(inode->i_mode))
879 stat->blksize = NFS_SERVER(inode)->dtsize;
acdc53b2 880out:
f4ce1299 881 trace_nfs_getattr_exit(inode, err);
1da177e4
LT		 882 return err;
883}
ddda8e0a 884EXPORT_SYMBOL_GPL(nfs_getattr);
1da177e4 885
f11ac8db
TM		 886static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
887{
2f62b5aa 888 refcount_set(&l_ctx->count, 1);
d51fdb87 889 l_ctx->lockowner = current->files;
f11ac8db 890 INIT_LIST_HEAD(&l_ctx->list);
210c7c17 891 atomic_set(&l_ctx->io_count, 0);
f11ac8db
TM		 892}
893
894static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
895{
1db97eaa 896 struct nfs_lock_context *pos;
f11ac8db 897
1db97eaa 898 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
d51fdb87 899 if (pos->lockowner != current->files)
f11ac8db 900 continue;
1db97eaa
TM		 901 if (refcount_inc_not_zero(&pos->count))
902 return pos;
903 }
f11ac8db
TM		 904 return NULL;
905}
906
907struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
908{
909 struct nfs_lock_context *res, *new = NULL;
2b0143b5 910 struct inode *inode = d_inode(ctx->dentry);
f11ac8db 911
1db97eaa 912 rcu_read_lock();
f11ac8db 913 res = __nfs_find_lock_context(ctx);
1db97eaa 914 rcu_read_unlock();
f11ac8db 915 if (res == NULL) {
f11ac8db
TM		 916 new = kmalloc(sizeof(*new), GFP_KERNEL);
917 if (new == NULL)
b3c54de6 918 return ERR_PTR(-ENOMEM);
f11ac8db
TM		 919 nfs_init_lock_context(new);
920 spin_lock(&inode->i_lock);
921 res = __nfs_find_lock_context(ctx);
922 if (res == NULL) {
15494511
TM		 923 new->open_context = get_nfs_open_context(ctx);
924 if (new->open_context) {
925 list_add_tail_rcu(&new->list,
926 &ctx->lock_context.list);
927 res = new;
928 new = NULL;
929 } else
930 res = ERR_PTR(-EBADF);
f11ac8db 931 }
1db97eaa
TM		 932 spin_unlock(&inode->i_lock);
933 kfree(new);
f11ac8db 934 }
f11ac8db
TM		 935 return res;
936}
1c6dcbe5 937EXPORT_SYMBOL_GPL(nfs_get_lock_context);
f11ac8db
TM		 938
939void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
940{
941 struct nfs_open_context *ctx = l_ctx->open_context;
2b0143b5 942 struct inode *inode = d_inode(ctx->dentry);
f11ac8db 943
2f62b5aa 944 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
f11ac8db 945 return;
1db97eaa 946 list_del_rcu(&l_ctx->list);
f11ac8db 947 spin_unlock(&inode->i_lock);
15494511 948 put_nfs_open_context(ctx);
1db97eaa 949 kfree_rcu(l_ctx, rcu_head);
f11ac8db 950}
1c6dcbe5 951EXPORT_SYMBOL_GPL(nfs_put_lock_context);
f11ac8db 952
7fe5c398
TM		 953/**
954 * nfs_close_context - Common close_context() routine NFSv2/v3
955 * @ctx: pointer to context
956 * @is_sync: is this a synchronous close
957 *
5cf9d706
TM		 958 * Ensure that the attributes are up to date if we're mounted
959 * with close-to-open semantics and we have cached data that will
960 * need to be revalidated on open.
7fe5c398
TM		 961 */
962void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
963{
5cf9d706 964 struct nfs_inode *nfsi;
7fe5c398
TM		 965 struct inode *inode;
966 struct nfs_server *server;
967
968 if (!(ctx->mode & FMODE_WRITE))
969 return;
970 if (!is_sync)
971 return;
2b0143b5 972 inode = d_inode(ctx->dentry);
58ff4184
TM		 973 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
974 return;
5cf9d706
TM		 975 nfsi = NFS_I(inode);
976 if (inode->i_mapping->nrpages == 0)
977 return;
978 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
979 return;
980 if (!list_empty(&nfsi->open_files))
7fe5c398
TM		 981 return;
982 server = NFS_SERVER(inode);
983 if (server->flags & NFS_MOUNT_NOCTO)
984 return;
985 nfs_revalidate_inode(server, inode);
986}
ddda8e0a 987EXPORT_SYMBOL_GPL(nfs_close_context);
7fe5c398 988
532d4def
N		 989struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
990 fmode_t f_mode,
991 struct file *filp)
1da177e4
LT		 992{
993 struct nfs_open_context *ctx;
994
f52720ca 995 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
1d179d6b 996 if (!ctx)
5ede7b1c 997 return ERR_PTR(-ENOMEM);
5ede7b1c
AV		 998 nfs_sb_active(dentry->d_sb);
999 ctx->dentry = dget(dentry);
1d179d6b
TM		 1000 if (filp)
1001 ctx->cred = get_cred(filp->f_cred);
1002 else
1003 ctx->cred = get_current_cred();
ddf529ee 1004 ctx->ll_cred = NULL;
5ede7b1c
AV		 1005 ctx->state = NULL;
1006 ctx->mode = f_mode;
1007 ctx->flags = 0;
1008 ctx->error = 0;
532d4def 1009 ctx->flock_owner = (fl_owner_t)filp;
5ede7b1c
AV		 1010 nfs_init_lock_context(&ctx->lock_context);
1011 ctx->lock_context.open_context = ctx;
1012 INIT_LIST_HEAD(&ctx->list);
82be417a 1013 ctx->mdsthreshold = NULL;
1da177e4
LT		 1014 return ctx;
1015}
89d77c8f 1016EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1da177e4
LT		 1017
1018struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1019{
0de43976
TM		 1020 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1021 return ctx;
1022 return NULL;
1da177e4 1023}
89d77c8f 1024EXPORT_SYMBOL_GPL(get_nfs_open_context);
1da177e4 1025
7fe5c398 1026static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1da177e4 1027{
2b0143b5 1028 struct inode *inode = d_inode(ctx->dentry);
3d4ff43d 1029 struct super_block *sb = ctx->dentry->d_sb;
3bec63db 1030
0de43976
TM		 1031 if (!refcount_dec_and_test(&ctx->lock_context.count))
1032 return;
5c78f58e 1033 if (!list_empty(&ctx->list)) {
0de43976
TM		 1034 spin_lock(&inode->i_lock);
1035 list_del_rcu(&ctx->list);
ef84303e 1036 spin_unlock(&inode->i_lock);
0de43976 1037 }
5c78f58e
TM		 1038 if (inode != NULL)
1039 NFS_PROTO(inode)->close_context(ctx, is_sync);
a52458b4 1040 put_cred(ctx->cred);
3d4ff43d 1041 dput(ctx->dentry);
322b2b90 1042 nfs_sb_deactive(sb);
ddf529ee 1043 put_rpccred(ctx->ll_cred);
82be417a 1044 kfree(ctx->mdsthreshold);
0de43976 1045 kfree_rcu(ctx, rcu_head);
3bec63db
TM		 1046}
1047
a49c3c77
TM		 1048void put_nfs_open_context(struct nfs_open_context *ctx)
1049{
1050 __put_nfs_open_context(ctx, 0);
1051}
89d77c8f 1052EXPORT_SYMBOL_GPL(put_nfs_open_context);
a49c3c77 1053
4eae5014
TM		 1054static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1055{
1056 __put_nfs_open_context(ctx, 1);
1057}
1058
1da177e4
LT		 1059/*
1060 * Ensure that mmap has a recent RPC credential for use when writing out
1061 * shared pages
1062 */
c45ffdd2 1063void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1da177e4 1064{
2b0143b5 1065 struct inode *inode = d_inode(ctx->dentry);
1da177e4
LT		 1066 struct nfs_inode *nfsi = NFS_I(inode);
1067
1da177e4 1068 spin_lock(&inode->i_lock);
1c341b77
TM		 1069 if (list_empty(&nfsi->open_files) &&
1070 (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER))
ac46b3d7
TM		 1071 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA |
1072 NFS_INO_REVAL_FORCED);
0de43976 1073 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1da177e4
LT		 1074 spin_unlock(&inode->i_lock);
1075}
c45ffdd2
TM		 1076EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1077
1078void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1079{
1080 filp->private_data = get_nfs_open_context(ctx);
1081 if (list_empty(&ctx->list))
1082 nfs_inode_attach_open_context(ctx);
1083}
89d77c8f 1084EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1da177e4 1085
d530838b
TM		 1086/*
1087 * Given an inode, search for an open context with the desired characteristics
1088 */
a52458b4 1089struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1da177e4
LT		 1090{
1091 struct nfs_inode *nfsi = NFS_I(inode);
1092 struct nfs_open_context *pos, *ctx = NULL;
1093
0de43976
TM		 1094 rcu_read_lock();
1095 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
65f51603 1096 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
d530838b 1097 continue;
1544fa0f
TM		 1098 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1099 continue;
1100 ctx = get_nfs_open_context(pos);
0de43976
TM		 1101 if (ctx)
1102 break;
1da177e4 1103 }
0de43976 1104 rcu_read_unlock();
1da177e4
LT		 1105 return ctx;
1106}
1107
aff8d8dc 1108void nfs_file_clear_open_context(struct file *filp)
1da177e4 1109{
cd3758e3 1110 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1da177e4
LT		 1111
1112 if (ctx) {
2b0143b5 1113 struct inode *inode = d_inode(ctx->dentry);
c45ffdd2 1114
0bcbf039
PT		 1115 /*
1116 * We fatal error on write before. Try to writeback
1117 * every page again.
1118 */
1119 if (ctx->error < 0)
1120 invalidate_inode_pages2(inode->i_mapping);
1da177e4 1121 filp->private_data = NULL;
4eae5014 1122 put_nfs_open_context_sync(ctx);
1da177e4
LT		 1123 }
1124}
1125
1126/*
1127 * These allocate and release file read/write context information.
1128 */
1129int nfs_open(struct inode *inode, struct file *filp)
1130{
1131 struct nfs_open_context *ctx;
1da177e4 1132
532d4def 1133 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
5ede7b1c
AV		 1134 if (IS_ERR(ctx))
1135 return PTR_ERR(ctx);
1da177e4
LT		 1136 nfs_file_set_open_context(filp, ctx);
1137 put_nfs_open_context(ctx);
f1fe29b4 1138 nfs_fscache_open_file(inode, filp);
1da177e4
LT		 1139 return 0;
1140}
44942b4e 1141EXPORT_SYMBOL_GPL(nfs_open);
1da177e4 1142
1da177e4
LT		 1143/*
1144 * This function is called whenever some part of NFS notices that
1145 * the cached attributes have to be refreshed.
1146 */
1147int
1148__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1149{
1150 int status = -ESTALE;
1775fd3e 1151 struct nfs4_label *label = NULL;
a3cba2aa 1152 struct nfs_fattr *fattr = NULL;
1da177e4 1153 struct nfs_inode *nfsi = NFS_I(inode);
1da177e4 1154
1e8968c5
NV		 1155 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1156 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1da177e4 1157
f4ce1299
TM		 1158 trace_nfs_revalidate_inode_enter(inode);
1159
85233a7a 1160 if (is_bad_inode(inode))
691beb13 1161 goto out;
1da177e4 1162 if (NFS_STALE(inode))
412d582e 1163 goto out;
7fdc49c4 1164
ac46bd37
TM		 1165 /* pNFS: Attributes aren't updated until we layoutcommit */
1166 if (S_ISREG(inode->i_mode)) {
1167 status = pnfs_sync_inode(inode, false);
1168 if (status)
1169 goto out;
1170 }
1171
a3cba2aa
TM		 1172 status = -ENOMEM;
1173 fattr = nfs_alloc_fattr();
1174 if (fattr == NULL)
1175 goto out;
1176
691beb13 1177 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
14c43f76
DQ		 1178
1179 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1180 if (IS_ERR(label)) {
1181 status = PTR_ERR(label);
1182 goto out;
1183 }
1184
a841b54d
TM		 1185 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1186 label, inode);
1da177e4 1187 if (status != 0) {
1e8968c5 1188 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1da177e4 1189 inode->i_sb->s_id,
1e8968c5 1190 (unsigned long long)NFS_FILEID(inode), status);
c74dfe97
TM		 1191 switch (status) {
1192 case -ETIMEDOUT:
1193 /* A soft timeout occurred. Use cached information? */
1194 if (server->flags & NFS_MOUNT_SOFTREVAL)
1195 status = 0;
1196 break;
1197 case -ESTALE:
1da177e4 1198 if (!S_ISDIR(inode->i_mode))
93ce4af7
TM		 1199 nfs_set_inode_stale(inode);
1200 else
1201 nfs_zap_caches(inode);
1da177e4 1202 }
14c43f76 1203 goto err_out;
1da177e4
LT		 1204 }
1205
a3cba2aa 1206 status = nfs_refresh_inode(inode, fattr);
1da177e4 1207 if (status) {
1e8968c5 1208 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1da177e4 1209 inode->i_sb->s_id,
1e8968c5 1210 (unsigned long long)NFS_FILEID(inode), status);
14c43f76 1211 goto err_out;
1da177e4 1212 }
55296809 1213
24aa1fe6 1214 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
ada70d94 1215 nfs_zap_acl_cache(inode);
55296809 1216
3da580aa
JL		 1217 nfs_setsecurity(inode, fattr, label);
1218
1e8968c5 1219 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1da177e4 1220 inode->i_sb->s_id,
1e8968c5 1221 (unsigned long long)NFS_FILEID(inode));
1da177e4 1222
14c43f76
DQ		 1223err_out:
1224 nfs4_label_free(label);
1225out:
a3cba2aa 1226 nfs_free_fattr(fattr);
f4ce1299 1227 trace_nfs_revalidate_inode_exit(inode, status);
1da177e4
LT		 1228 return status;
1229}
1230
43f291cd 1231int nfs_attribute_cache_expired(struct inode *inode)
d7cf8dd0 1232{
b4d2314b 1233 if (nfs_have_delegated_attributes(inode))
1da177e4 1234 return 0;
d7cf8dd0 1235 return nfs_attribute_timeout(inode);
1da177e4
LT		 1236}
1237
1238/**
1239 * nfs_revalidate_inode - Revalidate the inode attributes
302fad7b
TM		 1240 * @server: pointer to nfs_server struct
1241 * @inode: pointer to inode struct
1da177e4
LT		 1242 *
1243 * Updates inode attribute information by retrieving the data from the server.
1244 */
1245int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1246{
311324ad 1247 if (!nfs_need_revalidate_inode(inode))
1da177e4
LT		 1248 return NFS_STALE(inode) ? -ESTALE : 0;
1249 return __nfs_revalidate_inode(server, inode);
1250}
1c606fb7 1251EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1da177e4 1252
1cda707d 1253static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
717d44e8 1254{
f8806c84
TM		 1255 int ret;
1256
717d44e8 1257 if (mapping->nrpages != 0) {
f8806c84
TM		 1258 if (S_ISREG(inode->i_mode)) {
1259 ret = nfs_sync_mapping(mapping);
1260 if (ret < 0)
1261 return ret;
1262 }
1263 ret = invalidate_inode_pages2(mapping);
717d44e8
TM		 1264 if (ret < 0)
1265 return ret;
1266 }
717d44e8 1267 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
de242c0b 1268 nfs_fscache_wait_on_invalidate(inode);
f4ce1299 1269
1e8968c5
NV		 1270 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1271 inode->i_sb->s_id,
1272 (unsigned long long)NFS_FILEID(inode));
717d44e8
TM		 1273 return 0;
1274}
1275
717d44e8 1276/**
28aa2f9e 1277 * nfs_clear_invalid_mapping - Conditionally clear a mapping
302fad7b 1278 * @mapping: pointer to mapping
28aa2f9e
TM		 1279 *
1280 * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping.
717d44e8 1281 */
28aa2f9e 1282int nfs_clear_invalid_mapping(struct address_space *mapping)
717d44e8 1283{
28aa2f9e 1284 struct inode *inode = mapping->host;
717d44e8 1285 struct nfs_inode *nfsi = NFS_I(inode);
d529ef83 1286 unsigned long *bitlock = &nfsi->flags;
717d44e8 1287 int ret = 0;
dc59250c 1288
d529ef83
JL		 1289 /*
1290 * We must clear NFS_INO_INVALID_DATA first to ensure that
1291 * invalidations that come in while we're shooting down the mappings
1292 * are respected. But, that leaves a race window where one revalidator
1293 * can clear the flag, and then another checks it before the mapping
1294 * gets invalidated. Fix that by serializing access to this part of
1295 * the function.
1296 *
1297 * At the same time, we need to allow other tasks to see whether we
1298 * might be in the middle of invalidating the pages, so we only set
1299 * the bit lock here if it looks like we're going to be doing that.
1300 */
1301 for (;;) {
74316201
N		 1302 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1303 nfs_wait_bit_killable, TASK_KILLABLE);
d529ef83
JL		 1304 if (ret)
1305 goto out;
17dfeb91
TM		 1306 spin_lock(&inode->i_lock);
1307 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1308 spin_unlock(&inode->i_lock);
1309 continue;
1310 }
1311 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
d529ef83 1312 break;
d529ef83 1313 spin_unlock(&inode->i_lock);
17dfeb91 1314 goto out;
f4ce1299
TM		 1315 }
1316
17dfeb91 1317 set_bit(NFS_INO_INVALIDATING, bitlock);
4db72b40 1318 smp_wmb();
28aa2f9e
TM		 1319 nfsi->cache_validity &=
1320 ~(NFS_INO_INVALID_DATA | NFS_INO_DATA_INVAL_DEFER);
17dfeb91
TM		 1321 spin_unlock(&inode->i_lock);
1322 trace_nfs_invalidate_mapping_enter(inode);
be527494 1323 ret = nfs_invalidate_mapping(inode, mapping);
17dfeb91
TM		 1324 trace_nfs_invalidate_mapping_exit(inode, ret);
1325
d529ef83 1326 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
4e857c58 1327 smp_mb__after_atomic();
d529ef83 1328 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
cd9ae2b6 1329out:
44b11874 1330 return ret;
7d52e862
TM		 1331}
1332
28aa2f9e
TM		 1333bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1334{
1335 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1336 NFS_STALE(inode);
1337}
1338
1339int nfs_revalidate_mapping_rcu(struct inode *inode)
1340{
1341 struct nfs_inode *nfsi = NFS_I(inode);
1342 unsigned long *bitlock = &nfsi->flags;
1343 int ret = 0;
1344
1345 if (IS_SWAPFILE(inode))
1346 goto out;
1347 if (nfs_mapping_need_revalidate_inode(inode)) {
1348 ret = -ECHILD;
1349 goto out;
1350 }
1351 spin_lock(&inode->i_lock);
1352 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1353 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1354 ret = -ECHILD;
1355 spin_unlock(&inode->i_lock);
1356out:
1357 return ret;
1358}
1359
1360/**
1361 * nfs_revalidate_mapping - Revalidate the pagecache
1362 * @inode: pointer to host inode
1363 * @mapping: pointer to mapping
1364 */
1365int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1366{
1367 /* swapfiles are not supposed to be shared. */
1368 if (IS_SWAPFILE(inode))
1369 return 0;
1370
1371 if (nfs_mapping_need_revalidate_inode(inode)) {
1372 int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1373 if (ret < 0)
1374 return ret;
1375 }
1376
1377 return nfs_clear_invalid_mapping(mapping);
1378}
1379
ca0daa27 1380static bool nfs_file_has_writers(struct nfs_inode *nfsi)
874f9463 1381{
ca0daa27
TM		 1382 struct inode *inode = &nfsi->vfs_inode;
1383
ca0daa27
TM		 1384 if (!S_ISREG(inode->i_mode))
1385 return false;
1386 if (list_empty(&nfsi->open_files))
1387 return false;
6ba0c4e5 1388 return inode_is_open_for_write(inode);
874f9463
TM		 1389}
1390
651b0e70 1391static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
874f9463 1392{
651b0e70 1393 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
874f9463
TM		 1394}
1395
783b194c 1396static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
a895b4a1 1397{
e86d5a02 1398 struct timespec64 ts;
95582b00 1399
9e6e70f8
TM		 1400 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1401 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
c472c07b 1402 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1eb5d98f 1403 inode_set_iversion_raw(inode, fattr->change_attr);
70ca8852 1404 if (S_ISDIR(inode->i_mode))
6edf9609 1405 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
0f44da51
FL		 1406 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1407 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
70ca8852 1408 }
a895b4a1 1409 /* If we have atomic WCC data, we may update some attributes */
e86d5a02 1410 ts = inode->i_ctime;
9e6e70f8
TM		 1411 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1412 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02
TM		 1413 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1414 inode->i_ctime = fattr->ctime;
27dc1cd3 1415 }
9e6e70f8 1416
e86d5a02 1417 ts = inode->i_mtime;
9e6e70f8
TM		 1418 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1419 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
e86d5a02
TM		 1420 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1421 inode->i_mtime = fattr->mtime;
27dc1cd3 1422 if (S_ISDIR(inode->i_mode))
6edf9609 1423 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
a895b4a1 1424 }
9e6e70f8
TM		 1425 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1426 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1427 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
a6b6d5b8 1428 && !nfs_have_writebacks(inode)) {
27dc1cd3 1429 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
27dc1cd3 1430 }
a895b4a1
TM		 1431}
1432
1da177e4 1433/**
33801147 1434 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
302fad7b
TM		 1435 * @inode: pointer to inode
1436 * @fattr: updated attributes
1da177e4
LT		 1437 *
1438 * Verifies the attribute cache. If we have just changed the attributes,
1439 * so that fattr carries weak cache consistency data, then it may
1440 * also update the ctime/mtime/change_attribute.
1441 */
33801147 1442static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1da177e4
LT		 1443{
1444 struct nfs_inode *nfsi = NFS_I(inode);
1445 loff_t cur_size, new_isize;
2a3f5fd4 1446 unsigned long invalid = 0;
e86d5a02 1447 struct timespec64 ts;
dc59250c 1448
4ebe83af 1449 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
01da47bd 1450 return 0;
4ebe83af 1451
eb3d8f42
TM		 1452 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1453 /* Only a mounted-on-fileid? Just exit */
1454 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1455 return 0;
ca62b9c3 1456 /* Has the inode gone and changed behind our back? */
eb3d8f42 1457 } else if (nfsi->fileid != fattr->fileid) {
7e10cc25
TM		 1458 /* Is this perhaps the mounted-on fileid? */
1459 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1460 nfsi->fileid == fattr->mounted_on_fileid)
1461 return 0;
cc89684c 1462 return -ESTALE;
7e10cc25 1463 }
9e6e70f8 1464 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
cc89684c 1465 return -ESTALE;
ca62b9c3 1466
7e10cc25 1467
651b0e70 1468 if (!nfs_file_has_buffered_writers(nfsi)) {
ca0daa27 1469 /* Verify a few of the more important attributes */
c472c07b 1470 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
16e14375
TM		 1471 invalid |= NFS_INO_INVALID_CHANGE
1472 | NFS_INO_REVAL_PAGECACHE;
1da177e4 1473
e86d5a02
TM		 1474 ts = inode->i_mtime;
1475 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
16e14375 1476 invalid |= NFS_INO_INVALID_MTIME;
ca62b9c3 1477
e86d5a02
TM		 1478 ts = inode->i_ctime;
1479 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
16e14375 1480 invalid |= NFS_INO_INVALID_CTIME;
ca0daa27
TM		 1481
1482 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1483 cur_size = i_size_read(inode);
1484 new_isize = nfs_size_to_loff_t(fattr->size);
1485 if (cur_size != new_isize)
16e14375
TM		 1486 invalid |= NFS_INO_INVALID_SIZE
1487 | NFS_INO_REVAL_PAGECACHE;
ca0daa27 1488 }
9e6e70f8 1489 }
1da177e4
LT		 1490
1491 /* Have any file permissions changed? */
9e6e70f8 1492 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
16e14375
TM		 1493 invalid |= NFS_INO_INVALID_ACCESS
1494 | NFS_INO_INVALID_ACL
1495 | NFS_INO_INVALID_OTHER;
9ff593c4 1496 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
16e14375
TM		 1497 invalid |= NFS_INO_INVALID_ACCESS
1498 | NFS_INO_INVALID_ACL
1499 | NFS_INO_INVALID_OTHER;
9ff593c4 1500 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
16e14375
TM		 1501 invalid |= NFS_INO_INVALID_ACCESS
1502 | NFS_INO_INVALID_ACL
1503 | NFS_INO_INVALID_OTHER;
1da177e4
LT		 1504
1505 /* Has the link count changed? */
9e6e70f8 1506 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
16e14375 1507 invalid |= NFS_INO_INVALID_OTHER;
1da177e4 1508
e86d5a02
TM		 1509 ts = inode->i_atime;
1510 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
2a3f5fd4
TM		 1511 invalid |= NFS_INO_INVALID_ATIME;
1512
1513 if (invalid != 0)
4ebe83af 1514 nfs_set_cache_invalid(inode, invalid);
1da177e4 1515
33801147 1516 nfsi->read_cache_jiffies = fattr->time_start;
1da177e4
LT		 1517 return 0;
1518}
1519
ae05f269 1520static atomic_long_t nfs_attr_generation_counter;
4704f0e2
TM		 1521
1522static unsigned long nfs_read_attr_generation_counter(void)
1523{
ae05f269 1524 return atomic_long_read(&nfs_attr_generation_counter);
4704f0e2
TM		 1525}
1526
1527unsigned long nfs_inc_attr_generation_counter(void)
1528{
ae05f269 1529 return atomic_long_inc_return(&nfs_attr_generation_counter);
4704f0e2 1530}
3235b403 1531EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
4704f0e2
TM		 1532
1533void nfs_fattr_init(struct nfs_fattr *fattr)
1534{
1535 fattr->valid = 0;
1536 fattr->time_start = jiffies;
1537 fattr->gencount = nfs_inc_attr_generation_counter();
6926afd1
TM		 1538 fattr->owner_name = NULL;
1539 fattr->group_name = NULL;
4704f0e2 1540}
ddda8e0a 1541EXPORT_SYMBOL_GPL(nfs_fattr_init);
4704f0e2 1542
140e049c
TM		 1543/**
1544 * nfs_fattr_set_barrier
1545 * @fattr: attributes
1546 *
1547 * Used to set a barrier after an attribute was updated. This
1548 * barrier ensures that older attributes from RPC calls that may
1549 * have raced with our update cannot clobber these new values.
1550 * Note that you are still responsible for ensuring that other
1551 * operations which change the attribute on the server do not
1552 * collide.
1553 */
1554void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1555{
1556 fattr->gencount = nfs_inc_attr_generation_counter();
1557}
1558
2d36bfde
TM		 1559struct nfs_fattr *nfs_alloc_fattr(void)
1560{
1561 struct nfs_fattr *fattr;
1562
1563 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1564 if (fattr != NULL)
1565 nfs_fattr_init(fattr);
1566 return fattr;
1567}
ddda8e0a 1568EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
2d36bfde
TM		 1569
1570struct nfs_fh *nfs_alloc_fhandle(void)
1571{
1572 struct nfs_fh *fh;
1573
1574 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1575 if (fh != NULL)
1576 fh->size = 0;
1577 return fh;
1578}
ddda8e0a 1579EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
2d36bfde 1580
e27d359e 1581#ifdef NFS_DEBUG
d8e0539e
WAA		 1582/*
1583 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1584 * in the same way that wireshark does
1585 *
1586 * @fh: file handle
1587 *
1588 * For debugging only.
1589 */
1590u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1591{
1592 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1593 * not on the result */
1264a2f0 1594 return nfs_fhandle_hash(fh);
d8e0539e 1595}
9e6ee76d 1596EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
d8e0539e
WAA		 1597
1598/*
20d27e92
CL		 1599 * _nfs_display_fhandle - display an NFS file handle on the console
1600 *
1601 * @fh: file handle to display
1602 * @caption: display caption
1603 *
1604 * For debugging only.
1605 */
20d27e92
CL		 1606void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1607{
1608 unsigned short i;
1609
fa68a1ba 1610 if (fh == NULL || fh->size == 0) {
20d27e92
CL		 1611 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1612 return;
1613 }
1614
d8e0539e
WAA		 1615 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1616 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
20d27e92
CL		 1617 for (i = 0; i < fh->size; i += 16) {
1618 __be32 *pos = (__be32 *)&fh->data[i];
1619
1620 switch ((fh->size - i - 1) >> 2) {
1621 case 0:
1622 printk(KERN_DEFAULT " %08x\n",
1623 be32_to_cpup(pos));
1624 break;
1625 case 1:
1626 printk(KERN_DEFAULT " %08x %08x\n",
1627 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1628 break;
1629 case 2:
1630 printk(KERN_DEFAULT " %08x %08x %08x\n",
1631 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1632 be32_to_cpup(pos + 2));
1633 break;
1634 default:
1635 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1636 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1637 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1638 }
1639 }
1640}
9e6ee76d 1641EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
20d27e92
CL		 1642#endif
1643
a10ad176
TM		 1644/**
1645 * nfs_inode_attrs_need_update - check if the inode attributes need updating
302fad7b
TM		 1646 * @inode: pointer to inode
1647 * @fattr: attributes
a10ad176
TM		 1648 *
1649 * Attempt to divine whether or not an RPC call reply carrying stale
1650 * attributes got scheduled after another call carrying updated ones.
1651 *
1652 * To do so, the function first assumes that a more recent ctime means
1653 * that the attributes in fattr are newer, however it also attempt to
1654 * catch the case where ctime either didn't change, or went backwards
1655 * (if someone reset the clock on the server) by looking at whether
1656 * or not this RPC call was started after the inode was last updated.
4704f0e2 1657 * Note also the check for wraparound of 'attr_gencount'
a10ad176
TM		 1658 *
1659 * The function returns 'true' if it thinks the attributes in 'fattr' are
1660 * more recent than the ones cached in the inode.
1661 *
1662 */
1663static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1664{
1665 const struct nfs_inode *nfsi = NFS_I(inode);
1666
4704f0e2 1667 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
4704f0e2 1668 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
a10ad176
TM		 1669}
1670
1671static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1672{
f4ce1299
TM		 1673 int ret;
1674
1675 trace_nfs_refresh_inode_enter(inode);
1676
a10ad176 1677 if (nfs_inode_attrs_need_update(inode, fattr))
f4ce1299
TM		 1678 ret = nfs_update_inode(inode, fattr);
1679 else
1680 ret = nfs_check_inode_attributes(inode, fattr);
1681
1682 trace_nfs_refresh_inode_exit(inode, ret);
1683 return ret;
870a5be8
TM		 1684}
1685
33801147
TM		 1686/**
1687 * nfs_refresh_inode - try to update the inode attribute cache
302fad7b
TM		 1688 * @inode: pointer to inode
1689 * @fattr: updated attributes
33801147
TM		 1690 *
1691 * Check that an RPC call that returned attributes has not overlapped with
1692 * other recent updates of the inode metadata, then decide whether it is
1693 * safe to do a full update of the inode attributes, or whether just to
1694 * call nfs_check_inode_attributes.
1695 */
1696int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1697{
33801147
TM		 1698 int status;
1699
1700 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1701 return 0;
1702 spin_lock(&inode->i_lock);
870a5be8 1703 status = nfs_refresh_inode_locked(inode, fattr);
33801147 1704 spin_unlock(&inode->i_lock);
ef79c097 1705
33801147
TM		 1706 return status;
1707}
ddda8e0a 1708EXPORT_SYMBOL_GPL(nfs_refresh_inode);
33801147 1709
16e14375
TM		 1710static int nfs_post_op_update_inode_locked(struct inode *inode,
1711 struct nfs_fattr *fattr, unsigned int invalid)
d65f557f 1712{
6edf9609
TM		 1713 if (S_ISDIR(inode->i_mode))
1714 invalid |= NFS_INO_INVALID_DATA;
1715 nfs_set_cache_invalid(inode, invalid);
d65f557f
TM		 1716 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1717 return 0;
1718 return nfs_refresh_inode_locked(inode, fattr);
1719}
1720
decf491f
TM		 1721/**
1722 * nfs_post_op_update_inode - try to update the inode attribute cache
302fad7b
TM		 1723 * @inode: pointer to inode
1724 * @fattr: updated attributes
decf491f
TM		 1725 *
1726 * After an operation that has changed the inode metadata, mark the
1727 * attribute cache as being invalid, then try to update it.
f551e44f
CL		 1728 *
1729 * NB: if the server didn't return any post op attributes, this
1730 * function will force the retrieval of attributes before the next
1731 * NFS request. Thus it should be used only for operations that
1732 * are expected to change one or more attributes, to avoid
1733 * unnecessary NFS requests and trips through nfs_update_inode().
decf491f
TM		 1734 */
1735int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1736{
d65f557f 1737 int status;
decf491f 1738
7668fdbe 1739 spin_lock(&inode->i_lock);
92d64e47 1740 nfs_fattr_set_barrier(fattr);
16e14375
TM		 1741 status = nfs_post_op_update_inode_locked(inode, fattr,
1742 NFS_INO_INVALID_CHANGE
d554168f
TM		 1743 | NFS_INO_INVALID_CTIME
1744 | NFS_INO_REVAL_FORCED);
7668fdbe 1745 spin_unlock(&inode->i_lock);
aa9c2669 1746
870a5be8 1747 return status;
decf491f 1748}
1c606fb7 1749EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
decf491f 1750
70ca8852 1751/**
a08a8cd3 1752 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
302fad7b
TM		 1753 * @inode: pointer to inode
1754 * @fattr: updated attributes
70ca8852
TM		 1755 *
1756 * After an operation that has changed the inode metadata, mark the
1757 * attribute cache as being invalid, then try to update it. Fake up
1758 * weak cache consistency data, if none exist.
1759 *
1760 * This function is mainly designed to be used by the ->write_done() functions.
1761 */
a08a8cd3 1762int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
70ca8852 1763{
d65f557f
TM		 1764 int status;
1765
d65f557f
TM		 1766 /* Don't do a WCC update if these attributes are already stale */
1767 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1768 !nfs_inode_attrs_need_update(inode, fattr)) {
9e6e70f8
TM		 1769 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1770 | NFS_ATTR_FATTR_PRESIZE
1771 | NFS_ATTR_FATTR_PREMTIME
1772 | NFS_ATTR_FATTR_PRECTIME);
d65f557f
TM		 1773 goto out_noforce;
1774 }
9e6e70f8
TM		 1775 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1776 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1eb5d98f 1777 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
9e6e70f8 1778 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
70ca8852 1779 }
9e6e70f8
TM		 1780 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1781 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
e86d5a02 1782 fattr->pre_ctime = inode->i_ctime;
9e6e70f8
TM		 1783 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1784 }
1785 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1786 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
e86d5a02 1787 fattr->pre_mtime = inode->i_mtime;
9e6e70f8
TM		 1788 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1789 }
1790 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1791 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
a3d01454 1792 fattr->pre_size = i_size_read(inode);
9e6e70f8 1793 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
70ca8852 1794 }
d65f557f 1795out_noforce:
16e14375
TM		 1796 status = nfs_post_op_update_inode_locked(inode, fattr,
1797 NFS_INO_INVALID_CHANGE
1798 | NFS_INO_INVALID_CTIME
3a39e778
ZB		 1799 | NFS_INO_INVALID_MTIME
1800 | NFS_INO_INVALID_BLOCKS);
a08a8cd3
TM		 1801 return status;
1802}
1803
1804/**
1805 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
302fad7b
TM		 1806 * @inode: pointer to inode
1807 * @fattr: updated attributes
a08a8cd3
TM		 1808 *
1809 * After an operation that has changed the inode metadata, mark the
1810 * attribute cache as being invalid, then try to update it. Fake up
1811 * weak cache consistency data, if none exist.
1812 *
1813 * This function is mainly designed to be used by the ->write_done() functions.
1814 */
1815int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1816{
1817 int status;
1818
1819 spin_lock(&inode->i_lock);
8f8ba1d7 1820 nfs_fattr_set_barrier(fattr);
a08a8cd3 1821 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
d65f557f
TM		 1822 spin_unlock(&inode->i_lock);
1823 return status;
70ca8852 1824}
ddda8e0a 1825EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
70ca8852 1826
ea96d1ec 1827
1da177e4
LT		 1828/*
1829 * Many nfs protocol calls return the new file attributes after
1830 * an operation. Here we update the inode to reflect the state
1831 * of the server's inode.
1832 *
1833 * This is a bit tricky because we have to make sure all dirty pages
1834 * have been sent off to the server before calling invalidate_inode_pages.
1835 * To make sure no other process adds more write requests while we try
1836 * our best to flush them, we make them sleep during the attribute refresh.
1837 *
1838 * A very similar scenario holds for the dir cache.
1839 */
24aa1fe6 1840static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1da177e4 1841{
8b4bdcf8 1842 struct nfs_server *server;
1da177e4 1843 struct nfs_inode *nfsi = NFS_I(inode);
951a143b 1844 loff_t cur_isize, new_isize;
2a3f5fd4 1845 unsigned long invalid = 0;
3e7d950a 1846 unsigned long now = jiffies;
62ab460c 1847 unsigned long save_cache_validity;
651b0e70 1848 bool have_writers = nfs_file_has_buffered_writers(nfsi);
944171cb 1849 bool cache_revalidated = true;
0b467264 1850 bool attr_changed = false;
c80d17c5 1851 bool have_delegation;
1da177e4 1852
1e8968c5 1853 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
3110ff80 1854 __func__, inode->i_sb->s_id, inode->i_ino,
4f1abd22 1855 nfs_display_fhandle_hash(NFS_FH(inode)),
1da177e4
LT		 1856 atomic_read(&inode->i_count), fattr->valid);
1857
eb3d8f42
TM		 1858 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1859 /* Only a mounted-on-fileid? Just exit */
1860 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1861 return 0;
7e10cc25 1862 /* Has the inode gone and changed behind our back? */
eb3d8f42 1863 } else if (nfsi->fileid != fattr->fileid) {
7e10cc25
TM		 1864 /* Is this perhaps the mounted-on fileid? */
1865 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1866 nfsi->fileid == fattr->mounted_on_fileid)
1867 return 0;
e73e6c9e
MT		 1868 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1869 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1870 NFS_SERVER(inode)->nfs_client->cl_hostname,
1871 inode->i_sb->s_id, (long long)nfsi->fileid,
1872 (long long)fattr->fileid);
1873 goto out_err;
1874 }
1da177e4
LT		 1875
1876 /*
1877 * Make sure the inode's type hasn't changed.
1878 */
e73e6c9e
MT		 1879 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1880 /*
1881 * Big trouble! The inode has become a different object.
1882 */
1e8968c5 1883 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
e73e6c9e
MT		 1884 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1885 goto out_err;
1886 }
1da177e4 1887
8b4bdcf8 1888 server = NFS_SERVER(inode);
a0356862 1889 /* Update the fsid? */
9e6e70f8 1890 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
c37dcd33 1891 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
36d43a43 1892 !IS_AUTOMOUNT(inode))
8b4bdcf8
TM		 1893 server->fsid = fattr->fsid;
1894
c80d17c5
TM		 1895 /* Save the delegation state before clearing cache_validity */
1896 have_delegation = nfs_have_delegated_attributes(inode);
1897
1da177e4
LT		 1898 /*
1899 * Update the read time so we don't revalidate too often.
1900 */
33801147 1901 nfsi->read_cache_jiffies = fattr->time_start;
3e7d950a 1902
62ab460c
TM		 1903 save_cache_validity = nfsi->cache_validity;
1904 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1905 | NFS_INO_INVALID_ATIME
1906 | NFS_INO_REVAL_FORCED
3a39e778
ZB		 1907 | NFS_INO_REVAL_PAGECACHE
1908 | NFS_INO_INVALID_BLOCKS);
1da177e4 1909
a895b4a1 1910 /* Do atomic weak cache consistency updates */
783b194c 1911 nfs_wcc_update_inode(inode, fattr);
a895b4a1 1912
944171cb
BC		 1913 if (pnfs_layoutcommit_outstanding(inode)) {
1914 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1915 cache_revalidated = false;
1916 }
10b7e9ad 1917
47aabaa7 1918 /* More cache consistency checks */
9e6e70f8 1919 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
c472c07b 1920 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
38512aa9 1921 /* Could it be a race with writeback? */
c80d17c5 1922 if (!(have_writers || have_delegation)) {
0b467264 1923 invalid |= NFS_INO_INVALID_DATA
38512aa9 1924 | NFS_INO_INVALID_ACCESS
95ad37f9
FL		 1925 | NFS_INO_INVALID_ACL
1926 | NFS_INO_INVALID_XATTR;
cac88f94 1927 /* Force revalidate of all attributes */
16e14375
TM		 1928 save_cache_validity |= NFS_INO_INVALID_CTIME
1929 | NFS_INO_INVALID_MTIME
1930 | NFS_INO_INVALID_SIZE
1931 | NFS_INO_INVALID_OTHER;
38512aa9
TM		 1932 if (S_ISDIR(inode->i_mode))
1933 nfs_force_lookup_revalidate(inode);
c80d17c5
TM		 1934 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1935 inode->i_sb->s_id,
1936 inode->i_ino);
1c341b77
TM		 1937 } else if (!have_delegation)
1938 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1eb5d98f 1939 inode_set_iversion_raw(inode, fattr->change_attr);
0b467264 1940 attr_changed = true;
9e6e70f8 1941 }
ade14a7d 1942 } else {
8619ddd0 1943 nfsi->cache_validity |= save_cache_validity &
16e14375 1944 (NFS_INO_INVALID_CHANGE
8619ddd0
TM		 1945 | NFS_INO_REVAL_PAGECACHE
1946 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1947 cache_revalidated = false;
1948 }
9e6e70f8
TM		 1949
1950 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
e86d5a02 1951 inode->i_mtime = fattr->mtime;
ade14a7d 1952 } else if (server->caps & NFS_CAP_MTIME) {
43b6535e 1953 nfsi->cache_validity |= save_cache_validity &
16e14375 1954 (NFS_INO_INVALID_MTIME
62ab460c 1955 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1956 cache_revalidated = false;
1957 }
62ab460c 1958
9e6e70f8 1959 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
e86d5a02 1960 inode->i_ctime = fattr->ctime;
ade14a7d 1961 } else if (server->caps & NFS_CAP_CTIME) {
43b6535e 1962 nfsi->cache_validity |= save_cache_validity &
16e14375 1963 (NFS_INO_INVALID_CTIME
62ab460c 1964 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1965 cache_revalidated = false;
1966 }
47aabaa7 1967
951a143b 1968 /* Check if our cached file size is stale */
9e6e70f8
TM		 1969 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1970 new_isize = nfs_size_to_loff_t(fattr->size);
1971 cur_isize = i_size_read(inode);
c80d17c5 1972 if (new_isize != cur_isize && !have_delegation) {
9e6e70f8
TM		 1973 /* Do we perhaps have any outstanding writes, or has
1974 * the file grown beyond our last write? */
a6b6d5b8 1975 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
9e6e70f8 1976 i_size_write(inode, new_isize);
ca0daa27 1977 if (!have_writers)
16e14375 1978 invalid |= NFS_INO_INVALID_DATA;
0b467264 1979 attr_changed = true;
9e6e70f8 1980 }
60c16ea8
HJ		 1981 dprintk("NFS: isize change on server for file %s/%ld "
1982 "(%Ld to %Ld)\n",
1983 inode->i_sb->s_id,
1984 inode->i_ino,
1985 (long long)cur_isize,
1986 (long long)new_isize);
1da177e4 1987 }
ade14a7d 1988 } else {
43b6535e 1989 nfsi->cache_validity |= save_cache_validity &
16e14375 1990 (NFS_INO_INVALID_SIZE
62ab460c
TM		 1991 | NFS_INO_REVAL_PAGECACHE
1992 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1993 cache_revalidated = false;
1994 }
1da177e4 1995
1da177e4 1996
9e6e70f8 1997 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
e86d5a02 1998 inode->i_atime = fattr->atime;
ade14a7d 1999 else if (server->caps & NFS_CAP_ATIME) {
43b6535e
TM		 2000 nfsi->cache_validity |= save_cache_validity &
2001 (NFS_INO_INVALID_ATIME
62ab460c 2002 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2003 cache_revalidated = false;
2004 }
1da177e4 2005
9e6e70f8
TM		 2006 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2007 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
9b4b3513
TM		 2008 umode_t newmode = inode->i_mode & S_IFMT;
2009 newmode |= fattr->mode & S_IALLUGO;
2010 inode->i_mode = newmode;
16e14375 2011 invalid |= NFS_INO_INVALID_ACCESS
0b467264
TM		 2012 | NFS_INO_INVALID_ACL;
2013 attr_changed = true;
9e6e70f8 2014 }
ade14a7d 2015 } else if (server->caps & NFS_CAP_MODE) {
43b6535e 2016 nfsi->cache_validity |= save_cache_validity &
0b467264 2017 (NFS_INO_INVALID_OTHER
62ab460c 2018 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2019 cache_revalidated = false;
2020 }
62ab460c 2021
9e6e70f8 2022 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
9ff593c4 2023 if (!uid_eq(inode->i_uid, fattr->uid)) {
16e14375 2024 invalid |= NFS_INO_INVALID_ACCESS
0b467264 2025 | NFS_INO_INVALID_ACL;
9e6e70f8 2026 inode->i_uid = fattr->uid;
0b467264 2027 attr_changed = true;
9e6e70f8 2028 }
ade14a7d 2029 } else if (server->caps & NFS_CAP_OWNER) {
43b6535e 2030 nfsi->cache_validity |= save_cache_validity &
0b467264 2031 (NFS_INO_INVALID_OTHER
62ab460c 2032 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2033 cache_revalidated = false;
2034 }
62ab460c 2035
9e6e70f8 2036 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
9ff593c4 2037 if (!gid_eq(inode->i_gid, fattr->gid)) {
16e14375 2038 invalid |= NFS_INO_INVALID_ACCESS
0b467264 2039 | NFS_INO_INVALID_ACL;
9e6e70f8 2040 inode->i_gid = fattr->gid;
0b467264 2041 attr_changed = true;
9e6e70f8 2042 }
ade14a7d 2043 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
43b6535e 2044 nfsi->cache_validity |= save_cache_validity &
0b467264 2045 (NFS_INO_INVALID_OTHER
62ab460c 2046 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2047 cache_revalidated = false;
2048 }
921615f1 2049
9e6e70f8
TM		 2050 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2051 if (inode->i_nlink != fattr->nlink) {
9e6e70f8
TM		 2052 if (S_ISDIR(inode->i_mode))
2053 invalid |= NFS_INO_INVALID_DATA;
bfe86848 2054 set_nlink(inode, fattr->nlink);
0b467264 2055 attr_changed = true;
9e6e70f8 2056 }
ade14a7d 2057 } else if (server->caps & NFS_CAP_NLINK) {
43b6535e 2058 nfsi->cache_validity |= save_cache_validity &
16e14375 2059 (NFS_INO_INVALID_OTHER
62ab460c 2060 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2061 cache_revalidated = false;
2062 }
1da177e4 2063
9e6e70f8 2064 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 2065 /*
2066 * report the blocks in 512byte units
2067 */
2068 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
ade14a7d 2069 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
9e6e70f8 2070 inode->i_blocks = fattr->du.nfs2.blocks;
3a39e778
ZB		 2071 else {
2072 nfsi->cache_validity |= save_cache_validity &
2073 (NFS_INO_INVALID_BLOCKS
2074 | NFS_INO_REVAL_FORCED);
ade14a7d 2075 cache_revalidated = false;
3a39e778 2076 }
1da177e4
LT		 2077
2078 /* Update attrtimeo value if we're out of the unstable period */
0b467264 2079 if (attr_changed) {
cac88f94 2080 invalid &= ~NFS_INO_INVALID_ATTR;
91d5b470 2081 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1da177e4 2082 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
3e7d950a 2083 nfsi->attrtimeo_timestamp = now;
f5062003 2084 /* Set barrier to be more recent than all outstanding updates */
4704f0e2 2085 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
6d2b2966 2086 } else {
ade14a7d
TM		 2087 if (cache_revalidated) {
2088 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2089 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2090 nfsi->attrtimeo <<= 1;
2091 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2092 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2093 }
6d2b2966
TM		 2094 nfsi->attrtimeo_timestamp = now;
2095 }
f5062003
TM		 2096 /* Set the barrier to be more recent than this fattr */
2097 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
2098 nfsi->attr_gencount = fattr->gencount;
1da177e4 2099 }
c812012f 2100
1da177e4
LT		 2101 /* Don't invalidate the data if we were to blame */
2102 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2103 || S_ISLNK(inode->i_mode)))
2104 invalid &= ~NFS_INO_INVALID_DATA;
c80d17c5 2105 nfs_set_cache_invalid(inode, invalid);
de242c0b 2106
1da177e4 2107 return 0;
b37b03b7 2108 out_err:
1da177e4
LT		 2109 /*
2110 * No need to worry about unhashing the dentry, as the
2111 * lookup validation will know that the inode is bad.
2112 * (But we fall through to invalidate the caches.)
2113 */
93ce4af7 2114 nfs_set_inode_stale_locked(inode);
1da177e4
LT		 2115 return -ESTALE;
2116}
2117
f7b422b1 2118struct inode *nfs_alloc_inode(struct super_block *sb)
1da177e4
LT		 2119{
2120 struct nfs_inode *nfsi;
c456aacf 2121 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1da177e4
LT		 2122 if (!nfsi)
2123 return NULL;
55296809
CL		 2124 nfsi->flags = 0UL;
2125 nfsi->cache_validity = 0UL;
89d77c8f 2126#if IS_ENABLED(CONFIG_NFS_V4)
e50a1c2e
BF		 2127 nfsi->nfs4_acl = NULL;
2128#endif /* CONFIG_NFS_V4 */
95ad37f9
FL		 2129#ifdef CONFIG_NFS_V4_2
2130 nfsi->xattr_cache = NULL;
2131#endif
1da177e4
LT		 2132 return &nfsi->vfs_inode;
2133}
89d77c8f 2134EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1da177e4 2135
ca1a199e 2136void nfs_free_inode(struct inode *inode)
1da177e4
LT		 2137{
2138 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2139}
ca1a199e 2140EXPORT_SYMBOL_GPL(nfs_free_inode);
fa0d7e3d 2141
d75d5414
AM		 2142static inline void nfs4_init_once(struct nfs_inode *nfsi)
2143{
89d77c8f 2144#if IS_ENABLED(CONFIG_NFS_V4)
d75d5414
AM		 2145 INIT_LIST_HEAD(&nfsi->open_states);
2146 nfsi->delegation = NULL;
d75d5414 2147 init_rwsem(&nfsi->rwsem);
e5e94017 2148 nfsi->layout = NULL;
d75d5414
AM		 2149#endif
2150}
f7b422b1 2151
51cc5068 2152static void init_once(void *foo)
1da177e4
LT		 2153{
2154 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2155
a35afb83 2156 inode_init_once(&nfsi->vfs_inode);
a35afb83
CL		 2157 INIT_LIST_HEAD(&nfsi->open_files);
2158 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2159 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
ea2cf228 2160 INIT_LIST_HEAD(&nfsi->commit_info.list);
a6b6d5b8 2161 atomic_long_set(&nfsi->nrequests, 0);
5cb953d4 2162 atomic_long_set(&nfsi->commit_info.ncommit, 0);
1a0de48a 2163 atomic_set(&nfsi->commit_info.rpcs_out, 0);
884be175 2164 init_rwsem(&nfsi->rmdir_sem);
e824f99a 2165 mutex_init(&nfsi->commit_mutex);
a35afb83 2166 nfs4_init_once(nfsi);
efeda80d 2167 nfsi->cache_change_attribute = 0;
1da177e4 2168}
20c2df83 2169
f7b422b1 2170static int __init nfs_init_inodecache(void)
1da177e4
LT		 2171{
2172 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2173 sizeof(struct nfs_inode),
fffb60f9 2174 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 2175 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 2176 init_once);
1da177e4
LT		 2177 if (nfs_inode_cachep == NULL)
2178 return -ENOMEM;
2179
2180 return 0;
2181}
2182
266bee88 2183static void nfs_destroy_inodecache(void)
1da177e4 2184{
8c0a8537
KS		 2185 /*
2186 * Make sure all delayed rcu free inodes are flushed before we
2187 * destroy cache.
2188 */
2189 rcu_barrier();
1a1d92c1 2190 kmem_cache_destroy(nfs_inode_cachep);
1da177e4
LT		 2191}
2192
5746006f 2193struct workqueue_struct *nfsiod_workqueue;
89d77c8f 2194EXPORT_SYMBOL_GPL(nfsiod_workqueue);
5746006f
TM		 2195
2196/*
2197 * start up the nfsiod workqueue
2198 */
2199static int nfsiod_start(void)
2200{
2201 struct workqueue_struct *wq;
2202 dprintk("RPC: creating workqueue nfsiod\n");
bf701b76 2203 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
5746006f
TM		 2204 if (wq == NULL)
2205 return -ENOMEM;
2206 nfsiod_workqueue = wq;
2207 return 0;
2208}
2209
2210/*
2211 * Destroy the nfsiod workqueue
2212 */
2213static void nfsiod_stop(void)
2214{
2215 struct workqueue_struct *wq;
2216
2217 wq = nfsiod_workqueue;
2218 if (wq == NULL)
2219 return;
2220 nfsiod_workqueue = NULL;
2221 destroy_workqueue(wq);
2222}
2223
c7d03a00 2224unsigned int nfs_net_id;
9e2e74db 2225EXPORT_SYMBOL_GPL(nfs_net_id);
1b340d01
SK		 2226
2227static int nfs_net_init(struct net *net)
2228{
6b13168b 2229 nfs_clients_init(net);
65b38851 2230 return nfs_fs_proc_net_init(net);
1b340d01
SK		 2231}
2232
2233static void nfs_net_exit(struct net *net)
2234{
65b38851 2235 nfs_fs_proc_net_exit(net);
10b7a70c 2236 nfs_clients_exit(net);
1b340d01
SK		 2237}
2238
2239static struct pernet_operations nfs_net_ops = {
2240 .init = nfs_net_init,
2241 .exit = nfs_net_exit,
2242 .id = &nfs_net_id,
2243 .size = sizeof(struct nfs_net),
2244};
2245
1da177e4
LT		 2246/*
2247 * Initialize NFS
2248 */
2249static int __init init_nfs_fs(void)
2250{
2251 int err;
2252
996bc4f4
TM		 2253 err = nfs_sysfs_init();
2254 if (err < 0)
2255 goto out10;
2256
1b340d01 2257 err = register_pernet_subsys(&nfs_net_ops);
e571cbf1 2258 if (err < 0)
89d77c8f 2259 goto out9;
e571cbf1 2260
8ec442ae
DH		 2261 err = nfs_fscache_register();
2262 if (err < 0)
89d77c8f 2263 goto out8;
8ec442ae 2264
5746006f
TM		 2265 err = nfsiod_start();
2266 if (err)
89d77c8f 2267 goto out7;
5746006f 2268
6aaca566
DH		 2269 err = nfs_fs_proc_init();
2270 if (err)
89d77c8f 2271 goto out6;
6aaca566 2272
1da177e4
LT		 2273 err = nfs_init_nfspagecache();
2274 if (err)
89d77c8f 2275 goto out5;
1da177e4
LT		 2276
2277 err = nfs_init_inodecache();
2278 if (err)
89d77c8f 2279 goto out4;
1da177e4
LT		 2280
2281 err = nfs_init_readpagecache();
2282 if (err)
89d77c8f 2283 goto out3;
1da177e4
LT		 2284
2285 err = nfs_init_writepagecache();
2286 if (err)
89d77c8f 2287 goto out2;
1da177e4 2288
1da177e4
LT		 2289 err = nfs_init_directcache();
2290 if (err)
89d77c8f 2291 goto out1;
1da177e4 2292
ec7652aa 2293 rpc_proc_register(&init_net, &nfs_rpcstat);
cd738ee9
KM		 2294
2295 err = register_nfs_fs();
2296 if (err)
129d1977
BS		 2297 goto out0;
2298
1da177e4 2299 return 0;
129d1977 2300out0:
ec7652aa 2301 rpc_proc_unregister(&init_net, "nfs");
1da177e4 2302 nfs_destroy_directcache();
89d77c8f 2303out1:
129d1977 2304 nfs_destroy_writepagecache();
89d77c8f 2305out2:
129d1977 2306 nfs_destroy_readpagecache();
89d77c8f 2307out3:
129d1977 2308 nfs_destroy_inodecache();
89d77c8f 2309out4:
129d1977 2310 nfs_destroy_nfspagecache();
89d77c8f 2311out5:
129d1977 2312 nfs_fs_proc_exit();
89d77c8f 2313out6:
129d1977 2314 nfsiod_stop();
89d77c8f 2315out7:
129d1977 2316 nfs_fscache_unregister();
89d77c8f 2317out8:
129d1977 2318 unregister_pernet_subsys(&nfs_net_ops);
89d77c8f 2319out9:
996bc4f4
TM		 2320 nfs_sysfs_exit();
2321out10:
1da177e4
LT		 2322 return err;
2323}
2324
2325static void __exit exit_nfs_fs(void)
2326{
1da177e4 2327 nfs_destroy_directcache();
1da177e4
LT		 2328 nfs_destroy_writepagecache();
2329 nfs_destroy_readpagecache();
2330 nfs_destroy_inodecache();
2331 nfs_destroy_nfspagecache();
8ec442ae 2332 nfs_fscache_unregister();
1b340d01 2333 unregister_pernet_subsys(&nfs_net_ops);
ec7652aa 2334 rpc_proc_unregister(&init_net, "nfs");
f7b422b1 2335 unregister_nfs_fs();
6aaca566 2336 nfs_fs_proc_exit();
5746006f 2337 nfsiod_stop();
996bc4f4 2338 nfs_sysfs_exit();
1da177e4
LT		 2339}
2340
2341/* Not quite true; I just maintain it */
2342MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2343MODULE_LICENSE("GPL");
f43bf0be 2344module_param(enable_ino64, bool, 0644);
1da177e4
LT		 2345
2346module_init(init_nfs_fs)
2347module_exit(exit_nfs_fs)
Linux 6.x block layer and io_uring tree(s)