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NFS: Clean up function nfs_mark_dir_for_revalidate()
[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;
6edf9609 226 if (inode->i_mapping->nrpages == 0)
1c341b77 227 flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER);
6edf9609
TM		 228 nfsi->cache_validity |= flags;
229 if (flags & NFS_INO_INVALID_DATA)
230 nfs_fscache_invalidate(inode);
231}
232
1da177e4
LT		 233/*
234 * Invalidate the local caches
235 */
b37b03b7 236static void nfs_zap_caches_locked(struct inode *inode)
1da177e4
LT		 237{
238 struct nfs_inode *nfsi = NFS_I(inode);
239 int mode = inode->i_mode;
240
91d5b470
CL		 241 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
242
c7c20973
TM		 243 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
244 nfsi->attrtimeo_timestamp = jiffies;
1da177e4 245
de242c0b 246 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
6edf9609 247 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 248 | NFS_INO_INVALID_DATA
249 | NFS_INO_INVALID_ACCESS
250 | NFS_INO_INVALID_ACL
95ad37f9 251 | NFS_INO_INVALID_XATTR
6edf9609 252 | NFS_INO_REVAL_PAGECACHE);
aa9c2669 253 } else
6edf9609 254 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 255 | NFS_INO_INVALID_ACCESS
256 | NFS_INO_INVALID_ACL
95ad37f9 257 | NFS_INO_INVALID_XATTR
6edf9609 258 | NFS_INO_REVAL_PAGECACHE);
fd1defc2 259 nfs_zap_label_cache_locked(nfsi);
b37b03b7 260}
dc59250c 261
b37b03b7
TM		 262void nfs_zap_caches(struct inode *inode)
263{
264 spin_lock(&inode->i_lock);
265 nfs_zap_caches_locked(inode);
dc59250c 266 spin_unlock(&inode->i_lock);
ada70d94
TM		 267}
268
cd9ae2b6
TM		 269void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
270{
271 if (mapping->nrpages != 0) {
272 spin_lock(&inode->i_lock);
6edf9609 273 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
cd9ae2b6
TM		 274 spin_unlock(&inode->i_lock);
275 }
276}
277
f41f7418 278void nfs_zap_acl_cache(struct inode *inode)
ada70d94
TM		 279{
280 void (*clear_acl_cache)(struct inode *);
281
282 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
283 if (clear_acl_cache != NULL)
284 clear_acl_cache(inode);
dc59250c 285 spin_lock(&inode->i_lock);
55296809 286 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
dc59250c 287 spin_unlock(&inode->i_lock);
1da177e4 288}
1c606fb7 289EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
1da177e4 290
c4812998
TM		 291void nfs_invalidate_atime(struct inode *inode)
292{
293 spin_lock(&inode->i_lock);
6edf9609 294 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
c4812998
TM		 295 spin_unlock(&inode->i_lock);
296}
ddda8e0a 297EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
c4812998 298
1da177e4 299/*
b37b03b7
TM		 300 * Invalidate, but do not unhash, the inode.
301 * NB: must be called with inode->i_lock held!
1da177e4 302 */
93ce4af7 303static void nfs_set_inode_stale_locked(struct inode *inode)
1da177e4 304{
3a10c30a 305 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
b37b03b7 306 nfs_zap_caches_locked(inode);
93ce4af7
TM		 307 trace_nfs_set_inode_stale(inode);
308}
309
310void nfs_set_inode_stale(struct inode *inode)
311{
312 spin_lock(&inode->i_lock);
313 nfs_set_inode_stale_locked(inode);
314 spin_unlock(&inode->i_lock);
1da177e4
LT		 315}
316
317struct nfs_find_desc {
318 struct nfs_fh *fh;
319 struct nfs_fattr *fattr;
320};
321
322/*
323 * In NFSv3 we can have 64bit inode numbers. In order to support
324 * this, and re-exported directories (also seen in NFSv2)
325 * we are forced to allow 2 different inodes to have the same
326 * i_ino.
327 */
328static int
329nfs_find_actor(struct inode *inode, void *opaque)
330{
331 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
332 struct nfs_fh *fh = desc->fh;
333 struct nfs_fattr *fattr = desc->fattr;
334
335 if (NFS_FILEID(inode) != fattr->fileid)
336 return 0;
f6488c9b
JL		 337 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
338 return 0;
1da177e4
LT		 339 if (nfs_compare_fh(NFS_FH(inode), fh))
340 return 0;
341 if (is_bad_inode(inode) || NFS_STALE(inode))
342 return 0;
343 return 1;
344}
345
346static int
347nfs_init_locked(struct inode *inode, void *opaque)
348{
349 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
350 struct nfs_fattr *fattr = desc->fattr;
351
99fadcd7 352 set_nfs_fileid(inode, fattr->fileid);
916ec34d 353 inode->i_mode = fattr->mode;
1da177e4
LT		 354 nfs_copy_fh(NFS_FH(inode), desc->fh);
355 return 0;
356}
357
e058f70b 358#ifdef CONFIG_NFS_V4_SECURITY_LABEL
fd1defc2
TM		 359static void nfs_clear_label_invalid(struct inode *inode)
360{
361 spin_lock(&inode->i_lock);
362 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
363 spin_unlock(&inode->i_lock);
364}
365
aa9c2669
DQ		 366void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
367 struct nfs4_label *label)
368{
369 int error;
370
371 if (label == NULL)
372 return;
373
aa9c2669
DQ		 374 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
375 error = security_inode_notifysecctx(inode, label->label,
376 label->len);
377 if (error)
378 printk(KERN_ERR "%s() %s %d "
379 "security_inode_notifysecctx() %d\n",
380 __func__,
381 (char *)label->label,
382 label->len, error);
fd1defc2 383 nfs_clear_label_invalid(inode);
aa9c2669
DQ		 384 }
385}
386
e058f70b
SD		 387struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
388{
389 struct nfs4_label *label = NULL;
390 int minor_version = server->nfs_client->cl_minorversion;
391
392 if (minor_version < 2)
393 return label;
394
395 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
396 return label;
397
398 label = kzalloc(sizeof(struct nfs4_label), flags);
399 if (label == NULL)
400 return ERR_PTR(-ENOMEM);
401
402 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
403 if (label->label == NULL) {
404 kfree(label);
405 return ERR_PTR(-ENOMEM);
406 }
407 label->len = NFS4_MAXLABELLEN;
408
409 return label;
410}
411EXPORT_SYMBOL_GPL(nfs4_label_alloc);
aa9c2669 412#else
829e57d7 413void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
aa9c2669
DQ		 414 struct nfs4_label *label)
415{
416}
e058f70b 417#endif
aa9c2669 418EXPORT_SYMBOL_GPL(nfs_setsecurity);
e058f70b 419
f174ff7a
PT		 420/* Search for inode identified by fh, fileid and i_mode in inode cache. */
421struct inode *
422nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
423{
424 struct nfs_find_desc desc = {
425 .fh = fh,
426 .fattr = fattr,
427 };
428 struct inode *inode;
429 unsigned long hash;
430
431 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
432 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
433 return NULL;
434
435 hash = nfs_fattr_to_ino_t(fattr);
436 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
437
438 dprintk("%s: returning %p\n", __func__, inode);
439 return inode;
440}
441
1da177e4
LT		 442/*
443 * This is our front-end to iget that looks up inodes by file handle
444 * instead of inode number.
445 */
446struct inode *
1775fd3e 447nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
1da177e4
LT		 448{
449 struct nfs_find_desc desc = {
450 .fh = fh,
451 .fattr = fattr
452 };
03f28e3a 453 struct inode *inode = ERR_PTR(-ENOENT);
1da177e4
LT		 454 unsigned long hash;
455
7ebb9315
BS		 456 nfs_attr_check_mountpoint(sb, fattr);
457
2ef47eb1
AS		 458 if (nfs_attr_use_mounted_on_fileid(fattr))
459 fattr->fileid = fattr->mounted_on_fileid;
460 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
1da177e4 461 goto out_no_inode;
9e6e70f8 462 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
1da177e4 463 goto out_no_inode;
1da177e4
LT		 464
465 hash = nfs_fattr_to_ino_t(fattr);
466
03f28e3a
TM		 467 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
468 if (inode == NULL) {
469 inode = ERR_PTR(-ENOMEM);
1da177e4 470 goto out_no_inode;
03f28e3a 471 }
1da177e4
LT		 472
473 if (inode->i_state & I_NEW) {
474 struct nfs_inode *nfsi = NFS_I(inode);
b0c4fddc 475 unsigned long now = jiffies;
1da177e4
LT		 476
477 /* We set i_ino for the few things that still rely on it,
478 * such as stat(2) */
479 inode->i_ino = hash;
480
481 /* We can't support update_atime(), since the server will reset it */
482 inode->i_flags |= S_NOATIME|S_NOCMTIME;
483 inode->i_mode = fattr->mode;
821a868a 484 nfsi->cache_validity = 0;
62ab460c
TM		 485 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
486 && nfs_server_capable(inode, NFS_CAP_MODE))
16e14375 487 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
1da177e4
LT		 488 /* Why so? Because we want revalidate for devices/FIFOs, and
489 * that's precisely what we have in nfs_file_inode_operations.
490 */
8fa5c000 491 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
1da177e4 492 if (S_ISREG(inode->i_mode)) {
1788ea6e 493 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
1da177e4 494 inode->i_data.a_ops = &nfs_file_aops;
1da177e4 495 } else if (S_ISDIR(inode->i_mode)) {
8fa5c000 496 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
1da177e4 497 inode->i_fop = &nfs_dir_operations;
11de3b11 498 inode->i_data.a_ops = &nfs_dir_aops;
55a97593 499 /* Deal with crossing mountpoints */
7ebb9315
BS		 500 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
501 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
6b97fd3d
MN		 502 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
503 inode->i_op = &nfs_referral_inode_operations;
504 else
505 inode->i_op = &nfs_mountpoint_inode_operations;
55a97593 506 inode->i_fop = NULL;
36d43a43 507 inode->i_flags |= S_AUTOMOUNT;
55a97593 508 }
21fc61c7 509 } else if (S_ISLNK(inode->i_mode)) {
1da177e4 510 inode->i_op = &nfs_symlink_inode_operations;
21fc61c7
AV		 511 inode_nohighmem(inode);
512 } else
1da177e4
LT		 513 init_special_inode(inode, inode->i_mode, fattr->rdev);
514
9e6e70f8
TM		 515 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
516 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
517 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
1eb5d98f 518 inode_set_iversion_raw(inode, 0);
9e6e70f8 519 inode->i_size = 0;
6d6b77f1 520 clear_nlink(inode);
9ff593c4
EB		 521 inode->i_uid = make_kuid(&init_user_ns, -2);
522 inode->i_gid = make_kgid(&init_user_ns, -2);
9e6e70f8
TM		 523 inode->i_blocks = 0;
524 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
2701d086
AA		 525 nfsi->write_io = 0;
526 nfsi->read_io = 0;
9e6e70f8 527
33801147 528 nfsi->read_cache_jiffies = fattr->time_start;
4704f0e2 529 nfsi->attr_gencount = fattr->gencount;
9e6e70f8 530 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
e86d5a02 531 inode->i_atime = fattr->atime;
62ab460c 532 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
16e14375 533 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
9e6e70f8 534 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
e86d5a02 535 inode->i_mtime = fattr->mtime;
62ab460c 536 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
16e14375 537 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
9e6e70f8 538 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 539 inode->i_ctime = fattr->ctime;
62ab460c 540 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
16e14375 541 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
9e6e70f8 542 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1eb5d98f 543 inode_set_iversion_raw(inode, fattr->change_attr);
cd812599 544 else
16e14375 545 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
9e6e70f8
TM		 546 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
547 inode->i_size = nfs_size_to_loff_t(fattr->size);
62ab460c 548 else
16e14375 549 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
9e6e70f8 550 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
bfe86848 551 set_nlink(inode, fattr->nlink);
62ab460c 552 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
16e14375 553 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 554 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
555 inode->i_uid = fattr->uid;
62ab460c 556 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
16e14375 557 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 558 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
559 inode->i_gid = fattr->gid;
62ab460c 560 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
16e14375 561 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
0f44da51
FL		 562 if (nfs_server_capable(inode, NFS_CAP_XATTR))
563 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
9e6e70f8
TM		 564 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
565 inode->i_blocks = fattr->du.nfs2.blocks;
566 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 567 /*
568 * report the blocks in 512byte units
569 */
570 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1da177e4 571 }
aa9c2669 572
821a868a
TM		 573 if (nfsi->cache_validity != 0)
574 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
575
aa9c2669
DQ		 576 nfs_setsecurity(inode, fattr, label);
577
1da177e4 578 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
b0c4fddc 579 nfsi->attrtimeo_timestamp = now;
1c3c07e9 580 nfsi->access_cache = RB_ROOT;
1da177e4 581
f1fe29b4 582 nfs_fscache_init_inode(inode);
ef79c097 583
1da177e4 584 unlock_new_inode(inode);
26fde4df
N		 585 } else {
586 int err = nfs_refresh_inode(inode, fattr);
587 if (err < 0) {
588 iput(inode);
589 inode = ERR_PTR(err);
590 goto out_no_inode;
591 }
592 }
1e8968c5 593 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
1da177e4 594 inode->i_sb->s_id,
1e8968c5 595 (unsigned long long)NFS_FILEID(inode),
4f1abd22 596 nfs_display_fhandle_hash(fh),
1da177e4
LT		 597 atomic_read(&inode->i_count));
598
599out:
600 return inode;
601
602out_no_inode:
03f28e3a 603 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
1da177e4
LT		 604 goto out;
605}
89d77c8f 606EXPORT_SYMBOL_GPL(nfs_fhget);
1da177e4 607
536e43d1 608#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		 609
610int
549c7297
CB		 611nfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
612 struct iattr *attr)
1da177e4 613{
2b0143b5 614 struct inode *inode = d_inode(dentry);
987f8dfc 615 struct nfs_fattr *fattr;
ae57ca0f 616 int error = 0;
1da177e4 617
91d5b470
CL		 618 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
619
188b95dd
JL		 620 /* skip mode change if it's just for clearing setuid/setgid */
621 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
622 attr->ia_valid &= ~ATTR_MODE;
623
1da177e4 624 if (attr->ia_valid & ATTR_SIZE) {
08a899d5
CH		 625 BUG_ON(!S_ISREG(inode->i_mode));
626
ae57ca0f
KM		 627 error = inode_newsize_ok(inode, attr->ia_size);
628 if (error)
629 return error;
630
631 if (attr->ia_size == i_size_read(inode))
1da177e4
LT		 632 attr->ia_valid &= ~ATTR_SIZE;
633 }
634
635 /* Optimization: if the end result is no change, don't RPC */
636 attr->ia_valid &= NFS_VALID_ATTRS;
536e43d1 637 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
1da177e4
LT		 638 return 0;
639
f4ce1299
TM		 640 trace_nfs_setattr_enter(inode);
641
755c1e20 642 /* Write all dirty data */
4d346bea
TM		 643 if (S_ISREG(inode->i_mode))
644 nfs_sync_inode(inode);
987f8dfc
TM		 645
646 fattr = nfs_alloc_fattr();
ae57ca0f
KM		 647 if (fattr == NULL) {
648 error = -ENOMEM;
987f8dfc 649 goto out;
ae57ca0f
KM		 650 }
651
987f8dfc 652 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
65e4308d 653 if (error == 0)
aa9c2669 654 error = nfs_refresh_inode(inode, fattr);
987f8dfc
TM		 655 nfs_free_fattr(fattr);
656out:
f4ce1299 657 trace_nfs_setattr_exit(inode, error);
65e4308d
TM		 658 return error;
659}
ddda8e0a 660EXPORT_SYMBOL_GPL(nfs_setattr);
65e4308d 661
a3d01454
TM		 662/**
663 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
664 * @inode: inode of the file used
665 * @offset: file offset to start truncating
666 *
667 * This is a copy of the common vmtruncate, but with the locking
668 * corrected to take into account the fact that NFS requires
669 * inode->i_size to be updated under the inode->i_lock.
f044636d 670 * Note: must be called with inode->i_lock held!
a3d01454
TM		 671 */
672static int nfs_vmtruncate(struct inode * inode, loff_t offset)
673{
c08d3b0e 674 int err;
a3d01454 675
c08d3b0e 676 err = inode_newsize_ok(inode, offset);
677 if (err)
678 goto out;
a3d01454 679
c08d3b0e 680 i_size_write(inode, offset);
6edf9609
TM		 681 /* Optimisation */
682 if (offset == 0)
1c341b77
TM		 683 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA |
684 NFS_INO_DATA_INVAL_DEFER);
f6cdfa6d 685 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
c08d3b0e 686
f044636d 687 spin_unlock(&inode->i_lock);
7caef267 688 truncate_pagecache(inode, offset);
f044636d 689 spin_lock(&inode->i_lock);
c08d3b0e 690out:
691 return err;
a3d01454
TM		 692}
693
65e4308d
TM		 694/**
695 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
696 * @inode: pointer to struct inode
697 * @attr: pointer to struct iattr
16e14375 698 * @fattr: pointer to struct nfs_fattr
65e4308d
TM		 699 *
700 * Note: we do this in the *proc.c in order to ensure that
701 * it works for things like exclusive creates too.
702 */
f044636d
TM		 703void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
704 struct nfs_fattr *fattr)
65e4308d 705{
f044636d
TM		 706 /* Barrier: bump the attribute generation count. */
707 nfs_fattr_set_barrier(fattr);
708
709 spin_lock(&inode->i_lock);
710 NFS_I(inode)->attr_gencount = fattr->gencount;
6a97d02d
TM		 711 if ((attr->ia_valid & ATTR_SIZE) != 0) {
712 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
713 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
714 nfs_vmtruncate(inode, attr->ia_size);
715 }
65e4308d 716 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
6a97d02d 717 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
1da177e4 718 if ((attr->ia_valid & ATTR_MODE) != 0) {
65e4308d
TM		 719 int mode = attr->ia_mode & S_IALLUGO;
720 mode |= inode->i_mode & ~S_IALLUGO;
1da177e4
LT		 721 inode->i_mode = mode;
722 }
723 if ((attr->ia_valid & ATTR_UID) != 0)
724 inode->i_uid = attr->ia_uid;
725 if ((attr->ia_valid & ATTR_GID) != 0)
726 inode->i_gid = attr->ia_gid;
6a97d02d 727 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 728 inode->i_ctime = fattr->ctime;
6a97d02d
TM		 729 else
730 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
731 | NFS_INO_INVALID_CTIME);
6edf9609
TM		 732 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
733 | NFS_INO_INVALID_ACL);
65e4308d 734 }
6a97d02d
TM		 735 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
736 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
737 | NFS_INO_INVALID_CTIME);
738 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
e86d5a02 739 inode->i_atime = fattr->atime;
6a97d02d
TM		 740 else if (attr->ia_valid & ATTR_ATIME_SET)
741 inode->i_atime = attr->ia_atime;
742 else
743 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
744
745 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 746 inode->i_ctime = fattr->ctime;
6a97d02d
TM		 747 else
748 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
749 | NFS_INO_INVALID_CTIME);
750 }
751 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
752 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
753 | NFS_INO_INVALID_CTIME);
754 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
e86d5a02 755 inode->i_mtime = fattr->mtime;
6a97d02d
TM		 756 else if (attr->ia_valid & ATTR_MTIME_SET)
757 inode->i_mtime = attr->ia_mtime;
758 else
759 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
760
761 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 762 inode->i_ctime = fattr->ctime;
6a97d02d
TM		 763 else
764 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
765 | NFS_INO_INVALID_CTIME);
65e4308d 766 }
616c3196
JL		 767 if (fattr->valid)
768 nfs_update_inode(inode, fattr);
f044636d 769 spin_unlock(&inode->i_lock);
1da177e4 770}
ddda8e0a 771EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
1da177e4 772
1bcf4c5c 773static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
311324ad
TM		 774{
775 struct dentry *parent;
776
1bcf4c5c
TM		 777 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
778 return;
311324ad 779 parent = dget_parent(dentry);
2b0143b5 780 nfs_force_use_readdirplus(d_inode(parent));
311324ad
TM		 781 dput(parent);
782}
783
1bcf4c5c
TM		 784static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
785{
786 struct dentry *parent;
787
788 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
789 return;
790 parent = dget_parent(dentry);
791 nfs_advise_use_readdirplus(d_inode(parent));
792 dput(parent);
793}
794
311324ad
TM		 795static bool nfs_need_revalidate_inode(struct inode *inode)
796{
797 if (NFS_I(inode)->cache_validity &
798 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
799 return true;
800 if (nfs_attribute_cache_expired(inode))
801 return true;
802 return false;
803}
804
549c7297
CB		 805int nfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
806 struct kstat *stat, u32 request_mask, unsigned int query_flags)
1da177e4 807{
a528d35e 808 struct inode *inode = d_inode(path->dentry);
9ccee940
TM		 809 struct nfs_server *server = NFS_SERVER(inode);
810 unsigned long cache_validity;
16caf5b6 811 int err = 0;
9ccee940
TM		 812 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
813 bool do_update = false;
1da177e4 814
f4ce1299 815 trace_nfs_getattr_enter(inode);
9ccee940 816
ac7cbb22
TM		 817 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
818 nfs_readdirplus_parent_cache_hit(path->dentry);
9ccee940 819 goto out_no_update;
ac7cbb22 820 }
9ccee940 821
acdc53b2 822 /* Flush out writes to the server in order to update c/mtime. */
9ccee940
TM		 823 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
824 S_ISREG(inode->i_mode)) {
79566ef0 825 err = filemap_write_and_wait(inode->i_mapping);
acdc53b2
TM		 826 if (err)
827 goto out;
28c494c5 828 }
fc33a7bb
CH		 829
830 /*
831 * We may force a getattr if the user cares about atime.
832 *
833 * Note that we only have to check the vfsmount flags here:
834 * - NFS always sets S_NOATIME by so checking it would give a
835 * bogus result
1751e8a6 836 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
fc33a7bb
CH		 837 * no point in checking those.
838 */
a528d35e
DH		 839 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
840 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
9ccee940
TM		 841 request_mask &= ~STATX_ATIME;
842
843 /* Is the user requesting attributes that might need revalidation? */
844 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
845 STATX_MTIME|STATX_UID|STATX_GID|
846 STATX_SIZE|STATX_BLOCKS)))
847 goto out_no_revalidate;
848
849 /* Check whether the cached attributes are stale */
850 do_update |= force_sync || nfs_attribute_cache_expired(inode);
851 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
852 do_update |= cache_validity &
853 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
854 if (request_mask & STATX_ATIME)
855 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
856 if (request_mask & (STATX_CTIME|STATX_MTIME))
857 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
3a39e778
ZB		 858 if (request_mask & STATX_BLOCKS)
859 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
9ccee940
TM		 860 if (do_update) {
861 /* Update the attribute cache */
59b86d85
HT		 862 if (!(server->flags & NFS_MOUNT_NOAC))
863 nfs_readdirplus_parent_cache_miss(path->dentry);
864 else
865 nfs_readdirplus_parent_cache_hit(path->dentry);
311324ad 866 err = __nfs_revalidate_inode(server, inode);
9ccee940
TM		 867 if (err)
868 goto out;
1bcf4c5c 869 } else
a528d35e 870 nfs_readdirplus_parent_cache_hit(path->dentry);
9ccee940
TM		 871out_no_revalidate:
872 /* Only return attributes that were revalidated. */
873 stat->result_mask &= request_mask;
874out_no_update:
0d56a451 875 generic_fillattr(&init_user_ns, inode, stat);
9ccee940
TM		 876 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
877 if (S_ISDIR(inode->i_mode))
878 stat->blksize = NFS_SERVER(inode)->dtsize;
acdc53b2 879out:
f4ce1299 880 trace_nfs_getattr_exit(inode, err);
1da177e4
LT		 881 return err;
882}
ddda8e0a 883EXPORT_SYMBOL_GPL(nfs_getattr);
1da177e4 884
f11ac8db
TM		 885static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
886{
2f62b5aa 887 refcount_set(&l_ctx->count, 1);
d51fdb87 888 l_ctx->lockowner = current->files;
f11ac8db 889 INIT_LIST_HEAD(&l_ctx->list);
210c7c17 890 atomic_set(&l_ctx->io_count, 0);
f11ac8db
TM		 891}
892
893static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
894{
1db97eaa 895 struct nfs_lock_context *pos;
f11ac8db 896
1db97eaa 897 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
d51fdb87 898 if (pos->lockowner != current->files)
f11ac8db 899 continue;
1db97eaa
TM		 900 if (refcount_inc_not_zero(&pos->count))
901 return pos;
902 }
f11ac8db
TM		 903 return NULL;
904}
905
906struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
907{
908 struct nfs_lock_context *res, *new = NULL;
2b0143b5 909 struct inode *inode = d_inode(ctx->dentry);
f11ac8db 910
1db97eaa 911 rcu_read_lock();
f11ac8db 912 res = __nfs_find_lock_context(ctx);
1db97eaa 913 rcu_read_unlock();
f11ac8db 914 if (res == NULL) {
f11ac8db
TM		 915 new = kmalloc(sizeof(*new), GFP_KERNEL);
916 if (new == NULL)
b3c54de6 917 return ERR_PTR(-ENOMEM);
f11ac8db
TM		 918 nfs_init_lock_context(new);
919 spin_lock(&inode->i_lock);
920 res = __nfs_find_lock_context(ctx);
921 if (res == NULL) {
15494511
TM		 922 new->open_context = get_nfs_open_context(ctx);
923 if (new->open_context) {
924 list_add_tail_rcu(&new->list,
925 &ctx->lock_context.list);
926 res = new;
927 new = NULL;
928 } else
929 res = ERR_PTR(-EBADF);
f11ac8db 930 }
1db97eaa
TM		 931 spin_unlock(&inode->i_lock);
932 kfree(new);
f11ac8db 933 }
f11ac8db
TM		 934 return res;
935}
1c6dcbe5 936EXPORT_SYMBOL_GPL(nfs_get_lock_context);
f11ac8db
TM		 937
938void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
939{
940 struct nfs_open_context *ctx = l_ctx->open_context;
2b0143b5 941 struct inode *inode = d_inode(ctx->dentry);
f11ac8db 942
2f62b5aa 943 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
f11ac8db 944 return;
1db97eaa 945 list_del_rcu(&l_ctx->list);
f11ac8db 946 spin_unlock(&inode->i_lock);
15494511 947 put_nfs_open_context(ctx);
1db97eaa 948 kfree_rcu(l_ctx, rcu_head);
f11ac8db 949}
1c6dcbe5 950EXPORT_SYMBOL_GPL(nfs_put_lock_context);
f11ac8db 951
7fe5c398
TM		 952/**
953 * nfs_close_context - Common close_context() routine NFSv2/v3
954 * @ctx: pointer to context
955 * @is_sync: is this a synchronous close
956 *
5cf9d706
TM		 957 * Ensure that the attributes are up to date if we're mounted
958 * with close-to-open semantics and we have cached data that will
959 * need to be revalidated on open.
7fe5c398
TM		 960 */
961void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
962{
5cf9d706 963 struct nfs_inode *nfsi;
7fe5c398
TM		 964 struct inode *inode;
965 struct nfs_server *server;
966
967 if (!(ctx->mode & FMODE_WRITE))
968 return;
969 if (!is_sync)
970 return;
2b0143b5 971 inode = d_inode(ctx->dentry);
58ff4184
TM		 972 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
973 return;
5cf9d706
TM		 974 nfsi = NFS_I(inode);
975 if (inode->i_mapping->nrpages == 0)
976 return;
977 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
978 return;
979 if (!list_empty(&nfsi->open_files))
7fe5c398
TM		 980 return;
981 server = NFS_SERVER(inode);
982 if (server->flags & NFS_MOUNT_NOCTO)
983 return;
984 nfs_revalidate_inode(server, inode);
985}
ddda8e0a 986EXPORT_SYMBOL_GPL(nfs_close_context);
7fe5c398 987
532d4def
N		 988struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
989 fmode_t f_mode,
990 struct file *filp)
1da177e4
LT		 991{
992 struct nfs_open_context *ctx;
993
f52720ca 994 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
1d179d6b 995 if (!ctx)
5ede7b1c 996 return ERR_PTR(-ENOMEM);
5ede7b1c
AV		 997 nfs_sb_active(dentry->d_sb);
998 ctx->dentry = dget(dentry);
1d179d6b
TM		 999 if (filp)
1000 ctx->cred = get_cred(filp->f_cred);
1001 else
1002 ctx->cred = get_current_cred();
ddf529ee 1003 ctx->ll_cred = NULL;
5ede7b1c
AV		 1004 ctx->state = NULL;
1005 ctx->mode = f_mode;
1006 ctx->flags = 0;
1007 ctx->error = 0;
532d4def 1008 ctx->flock_owner = (fl_owner_t)filp;
5ede7b1c
AV		 1009 nfs_init_lock_context(&ctx->lock_context);
1010 ctx->lock_context.open_context = ctx;
1011 INIT_LIST_HEAD(&ctx->list);
82be417a 1012 ctx->mdsthreshold = NULL;
1da177e4
LT		 1013 return ctx;
1014}
89d77c8f 1015EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1da177e4
LT		 1016
1017struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1018{
0de43976
TM		 1019 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1020 return ctx;
1021 return NULL;
1da177e4 1022}
89d77c8f 1023EXPORT_SYMBOL_GPL(get_nfs_open_context);
1da177e4 1024
7fe5c398 1025static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1da177e4 1026{
2b0143b5 1027 struct inode *inode = d_inode(ctx->dentry);
3d4ff43d 1028 struct super_block *sb = ctx->dentry->d_sb;
3bec63db 1029
0de43976
TM		 1030 if (!refcount_dec_and_test(&ctx->lock_context.count))
1031 return;
5c78f58e 1032 if (!list_empty(&ctx->list)) {
0de43976
TM		 1033 spin_lock(&inode->i_lock);
1034 list_del_rcu(&ctx->list);
ef84303e 1035 spin_unlock(&inode->i_lock);
0de43976 1036 }
5c78f58e
TM		 1037 if (inode != NULL)
1038 NFS_PROTO(inode)->close_context(ctx, is_sync);
a52458b4 1039 put_cred(ctx->cred);
3d4ff43d 1040 dput(ctx->dentry);
322b2b90 1041 nfs_sb_deactive(sb);
ddf529ee 1042 put_rpccred(ctx->ll_cred);
82be417a 1043 kfree(ctx->mdsthreshold);
0de43976 1044 kfree_rcu(ctx, rcu_head);
3bec63db
TM		 1045}
1046
a49c3c77
TM		 1047void put_nfs_open_context(struct nfs_open_context *ctx)
1048{
1049 __put_nfs_open_context(ctx, 0);
1050}
89d77c8f 1051EXPORT_SYMBOL_GPL(put_nfs_open_context);
a49c3c77 1052
4eae5014
TM		 1053static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1054{
1055 __put_nfs_open_context(ctx, 1);
1056}
1057
1da177e4
LT		 1058/*
1059 * Ensure that mmap has a recent RPC credential for use when writing out
1060 * shared pages
1061 */
c45ffdd2 1062void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1da177e4 1063{
2b0143b5 1064 struct inode *inode = d_inode(ctx->dentry);
1da177e4
LT		 1065 struct nfs_inode *nfsi = NFS_I(inode);
1066
1da177e4 1067 spin_lock(&inode->i_lock);
1c341b77
TM		 1068 if (list_empty(&nfsi->open_files) &&
1069 (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER))
1070 nfsi->cache_validity |= NFS_INO_INVALID_DATA |
1071 NFS_INO_REVAL_FORCED;
0de43976 1072 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1da177e4
LT		 1073 spin_unlock(&inode->i_lock);
1074}
c45ffdd2
TM		 1075EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1076
1077void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1078{
1079 filp->private_data = get_nfs_open_context(ctx);
1080 if (list_empty(&ctx->list))
1081 nfs_inode_attach_open_context(ctx);
1082}
89d77c8f 1083EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1da177e4 1084
d530838b
TM		 1085/*
1086 * Given an inode, search for an open context with the desired characteristics
1087 */
a52458b4 1088struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1da177e4
LT		 1089{
1090 struct nfs_inode *nfsi = NFS_I(inode);
1091 struct nfs_open_context *pos, *ctx = NULL;
1092
0de43976
TM		 1093 rcu_read_lock();
1094 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
65f51603 1095 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
d530838b 1096 continue;
1544fa0f
TM		 1097 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1098 continue;
1099 ctx = get_nfs_open_context(pos);
0de43976
TM		 1100 if (ctx)
1101 break;
1da177e4 1102 }
0de43976 1103 rcu_read_unlock();
1da177e4
LT		 1104 return ctx;
1105}
1106
aff8d8dc 1107void nfs_file_clear_open_context(struct file *filp)
1da177e4 1108{
cd3758e3 1109 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1da177e4
LT		 1110
1111 if (ctx) {
2b0143b5 1112 struct inode *inode = d_inode(ctx->dentry);
c45ffdd2 1113
0bcbf039
PT		 1114 /*
1115 * We fatal error on write before. Try to writeback
1116 * every page again.
1117 */
1118 if (ctx->error < 0)
1119 invalidate_inode_pages2(inode->i_mapping);
1da177e4 1120 filp->private_data = NULL;
4eae5014 1121 put_nfs_open_context_sync(ctx);
1da177e4
LT		 1122 }
1123}
1124
1125/*
1126 * These allocate and release file read/write context information.
1127 */
1128int nfs_open(struct inode *inode, struct file *filp)
1129{
1130 struct nfs_open_context *ctx;
1da177e4 1131
532d4def 1132 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
5ede7b1c
AV		 1133 if (IS_ERR(ctx))
1134 return PTR_ERR(ctx);
1da177e4
LT		 1135 nfs_file_set_open_context(filp, ctx);
1136 put_nfs_open_context(ctx);
f1fe29b4 1137 nfs_fscache_open_file(inode, filp);
1da177e4
LT		 1138 return 0;
1139}
44942b4e 1140EXPORT_SYMBOL_GPL(nfs_open);
1da177e4 1141
1da177e4
LT		 1142/*
1143 * This function is called whenever some part of NFS notices that
1144 * the cached attributes have to be refreshed.
1145 */
1146int
1147__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1148{
1149 int status = -ESTALE;
1775fd3e 1150 struct nfs4_label *label = NULL;
a3cba2aa 1151 struct nfs_fattr *fattr = NULL;
1da177e4 1152 struct nfs_inode *nfsi = NFS_I(inode);
1da177e4 1153
1e8968c5
NV		 1154 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1155 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1da177e4 1156
f4ce1299
TM		 1157 trace_nfs_revalidate_inode_enter(inode);
1158
85233a7a 1159 if (is_bad_inode(inode))
691beb13 1160 goto out;
1da177e4 1161 if (NFS_STALE(inode))
412d582e 1162 goto out;
7fdc49c4 1163
ac46bd37
TM		 1164 /* pNFS: Attributes aren't updated until we layoutcommit */
1165 if (S_ISREG(inode->i_mode)) {
1166 status = pnfs_sync_inode(inode, false);
1167 if (status)
1168 goto out;
1169 }
1170
a3cba2aa
TM		 1171 status = -ENOMEM;
1172 fattr = nfs_alloc_fattr();
1173 if (fattr == NULL)
1174 goto out;
1175
691beb13 1176 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
14c43f76
DQ		 1177
1178 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1179 if (IS_ERR(label)) {
1180 status = PTR_ERR(label);
1181 goto out;
1182 }
1183
a841b54d
TM		 1184 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1185 label, inode);
1da177e4 1186 if (status != 0) {
1e8968c5 1187 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1da177e4 1188 inode->i_sb->s_id,
1e8968c5 1189 (unsigned long long)NFS_FILEID(inode), status);
c74dfe97
TM		 1190 switch (status) {
1191 case -ETIMEDOUT:
1192 /* A soft timeout occurred. Use cached information? */
1193 if (server->flags & NFS_MOUNT_SOFTREVAL)
1194 status = 0;
1195 break;
1196 case -ESTALE:
1da177e4 1197 if (!S_ISDIR(inode->i_mode))
93ce4af7
TM		 1198 nfs_set_inode_stale(inode);
1199 else
1200 nfs_zap_caches(inode);
1da177e4 1201 }
14c43f76 1202 goto err_out;
1da177e4
LT		 1203 }
1204
a3cba2aa 1205 status = nfs_refresh_inode(inode, fattr);
1da177e4 1206 if (status) {
1e8968c5 1207 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1da177e4 1208 inode->i_sb->s_id,
1e8968c5 1209 (unsigned long long)NFS_FILEID(inode), status);
14c43f76 1210 goto err_out;
1da177e4 1211 }
55296809 1212
24aa1fe6 1213 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
ada70d94 1214 nfs_zap_acl_cache(inode);
55296809 1215
3da580aa
JL		 1216 nfs_setsecurity(inode, fattr, label);
1217
1e8968c5 1218 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1da177e4 1219 inode->i_sb->s_id,
1e8968c5 1220 (unsigned long long)NFS_FILEID(inode));
1da177e4 1221
14c43f76
DQ		 1222err_out:
1223 nfs4_label_free(label);
1224out:
a3cba2aa 1225 nfs_free_fattr(fattr);
f4ce1299 1226 trace_nfs_revalidate_inode_exit(inode, status);
1da177e4
LT		 1227 return status;
1228}
1229
43f291cd 1230int nfs_attribute_cache_expired(struct inode *inode)
d7cf8dd0 1231{
b4d2314b 1232 if (nfs_have_delegated_attributes(inode))
1da177e4 1233 return 0;
d7cf8dd0 1234 return nfs_attribute_timeout(inode);
1da177e4
LT		 1235}
1236
1237/**
1238 * nfs_revalidate_inode - Revalidate the inode attributes
302fad7b
TM		 1239 * @server: pointer to nfs_server struct
1240 * @inode: pointer to inode struct
1da177e4
LT		 1241 *
1242 * Updates inode attribute information by retrieving the data from the server.
1243 */
1244int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1245{
311324ad 1246 if (!nfs_need_revalidate_inode(inode))
1da177e4
LT		 1247 return NFS_STALE(inode) ? -ESTALE : 0;
1248 return __nfs_revalidate_inode(server, inode);
1249}
1c606fb7 1250EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1da177e4 1251
1cda707d 1252static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
717d44e8 1253{
f8806c84
TM		 1254 int ret;
1255
717d44e8 1256 if (mapping->nrpages != 0) {
f8806c84
TM		 1257 if (S_ISREG(inode->i_mode)) {
1258 ret = nfs_sync_mapping(mapping);
1259 if (ret < 0)
1260 return ret;
1261 }
1262 ret = invalidate_inode_pages2(mapping);
717d44e8
TM		 1263 if (ret < 0)
1264 return ret;
1265 }
717d44e8 1266 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
de242c0b 1267 nfs_fscache_wait_on_invalidate(inode);
f4ce1299 1268
1e8968c5
NV		 1269 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1270 inode->i_sb->s_id,
1271 (unsigned long long)NFS_FILEID(inode));
717d44e8
TM		 1272 return 0;
1273}
1274
717d44e8 1275/**
28aa2f9e 1276 * nfs_clear_invalid_mapping - Conditionally clear a mapping
302fad7b 1277 * @mapping: pointer to mapping
28aa2f9e
TM		 1278 *
1279 * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping.
717d44e8 1280 */
28aa2f9e 1281int nfs_clear_invalid_mapping(struct address_space *mapping)
717d44e8 1282{
28aa2f9e 1283 struct inode *inode = mapping->host;
717d44e8 1284 struct nfs_inode *nfsi = NFS_I(inode);
d529ef83 1285 unsigned long *bitlock = &nfsi->flags;
717d44e8 1286 int ret = 0;
dc59250c 1287
d529ef83
JL		 1288 /*
1289 * We must clear NFS_INO_INVALID_DATA first to ensure that
1290 * invalidations that come in while we're shooting down the mappings
1291 * are respected. But, that leaves a race window where one revalidator
1292 * can clear the flag, and then another checks it before the mapping
1293 * gets invalidated. Fix that by serializing access to this part of
1294 * the function.
1295 *
1296 * At the same time, we need to allow other tasks to see whether we
1297 * might be in the middle of invalidating the pages, so we only set
1298 * the bit lock here if it looks like we're going to be doing that.
1299 */
1300 for (;;) {
74316201
N		 1301 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1302 nfs_wait_bit_killable, TASK_KILLABLE);
d529ef83
JL		 1303 if (ret)
1304 goto out;
17dfeb91
TM		 1305 spin_lock(&inode->i_lock);
1306 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1307 spin_unlock(&inode->i_lock);
1308 continue;
1309 }
1310 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
d529ef83 1311 break;
d529ef83 1312 spin_unlock(&inode->i_lock);
17dfeb91 1313 goto out;
f4ce1299
TM		 1314 }
1315
17dfeb91 1316 set_bit(NFS_INO_INVALIDATING, bitlock);
4db72b40 1317 smp_wmb();
28aa2f9e
TM		 1318 nfsi->cache_validity &=
1319 ~(NFS_INO_INVALID_DATA | NFS_INO_DATA_INVAL_DEFER);
17dfeb91
TM		 1320 spin_unlock(&inode->i_lock);
1321 trace_nfs_invalidate_mapping_enter(inode);
be527494 1322 ret = nfs_invalidate_mapping(inode, mapping);
17dfeb91
TM		 1323 trace_nfs_invalidate_mapping_exit(inode, ret);
1324
d529ef83 1325 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
4e857c58 1326 smp_mb__after_atomic();
d529ef83 1327 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
cd9ae2b6 1328out:
44b11874 1329 return ret;
7d52e862
TM		 1330}
1331
28aa2f9e
TM		 1332bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1333{
1334 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1335 NFS_STALE(inode);
1336}
1337
1338int nfs_revalidate_mapping_rcu(struct inode *inode)
1339{
1340 struct nfs_inode *nfsi = NFS_I(inode);
1341 unsigned long *bitlock = &nfsi->flags;
1342 int ret = 0;
1343
1344 if (IS_SWAPFILE(inode))
1345 goto out;
1346 if (nfs_mapping_need_revalidate_inode(inode)) {
1347 ret = -ECHILD;
1348 goto out;
1349 }
1350 spin_lock(&inode->i_lock);
1351 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1352 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1353 ret = -ECHILD;
1354 spin_unlock(&inode->i_lock);
1355out:
1356 return ret;
1357}
1358
1359/**
1360 * nfs_revalidate_mapping - Revalidate the pagecache
1361 * @inode: pointer to host inode
1362 * @mapping: pointer to mapping
1363 */
1364int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1365{
1366 /* swapfiles are not supposed to be shared. */
1367 if (IS_SWAPFILE(inode))
1368 return 0;
1369
1370 if (nfs_mapping_need_revalidate_inode(inode)) {
1371 int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1372 if (ret < 0)
1373 return ret;
1374 }
1375
1376 return nfs_clear_invalid_mapping(mapping);
1377}
1378
ca0daa27 1379static bool nfs_file_has_writers(struct nfs_inode *nfsi)
874f9463 1380{
ca0daa27
TM		 1381 struct inode *inode = &nfsi->vfs_inode;
1382
ca0daa27
TM		 1383 if (!S_ISREG(inode->i_mode))
1384 return false;
1385 if (list_empty(&nfsi->open_files))
1386 return false;
6ba0c4e5 1387 return inode_is_open_for_write(inode);
874f9463
TM		 1388}
1389
651b0e70 1390static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
874f9463 1391{
651b0e70 1392 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
874f9463
TM		 1393}
1394
783b194c 1395static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
a895b4a1 1396{
e86d5a02 1397 struct timespec64 ts;
95582b00 1398
9e6e70f8
TM		 1399 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1400 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
c472c07b 1401 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1eb5d98f 1402 inode_set_iversion_raw(inode, fattr->change_attr);
70ca8852 1403 if (S_ISDIR(inode->i_mode))
6edf9609 1404 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
0f44da51
FL		 1405 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1406 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
70ca8852 1407 }
a895b4a1 1408 /* If we have atomic WCC data, we may update some attributes */
e86d5a02 1409 ts = inode->i_ctime;
9e6e70f8
TM		 1410 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1411 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02
TM		 1412 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1413 inode->i_ctime = fattr->ctime;
27dc1cd3 1414 }
9e6e70f8 1415
e86d5a02 1416 ts = inode->i_mtime;
9e6e70f8
TM		 1417 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1418 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
e86d5a02
TM		 1419 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1420 inode->i_mtime = fattr->mtime;
27dc1cd3 1421 if (S_ISDIR(inode->i_mode))
6edf9609 1422 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
a895b4a1 1423 }
9e6e70f8
TM		 1424 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1425 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1426 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
a6b6d5b8 1427 && !nfs_have_writebacks(inode)) {
27dc1cd3 1428 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
27dc1cd3 1429 }
a895b4a1
TM		 1430}
1431
1da177e4 1432/**
33801147 1433 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
302fad7b
TM		 1434 * @inode: pointer to inode
1435 * @fattr: updated attributes
1da177e4
LT		 1436 *
1437 * Verifies the attribute cache. If we have just changed the attributes,
1438 * so that fattr carries weak cache consistency data, then it may
1439 * also update the ctime/mtime/change_attribute.
1440 */
33801147 1441static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1da177e4
LT		 1442{
1443 struct nfs_inode *nfsi = NFS_I(inode);
1444 loff_t cur_size, new_isize;
2a3f5fd4 1445 unsigned long invalid = 0;
e86d5a02 1446 struct timespec64 ts;
dc59250c 1447
4ebe83af 1448 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
01da47bd 1449 return 0;
4ebe83af 1450
eb3d8f42
TM		 1451 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1452 /* Only a mounted-on-fileid? Just exit */
1453 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1454 return 0;
ca62b9c3 1455 /* Has the inode gone and changed behind our back? */
eb3d8f42 1456 } else if (nfsi->fileid != fattr->fileid) {
7e10cc25
TM		 1457 /* Is this perhaps the mounted-on fileid? */
1458 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1459 nfsi->fileid == fattr->mounted_on_fileid)
1460 return 0;
cc89684c 1461 return -ESTALE;
7e10cc25 1462 }
9e6e70f8 1463 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
cc89684c 1464 return -ESTALE;
ca62b9c3 1465
7e10cc25 1466
651b0e70 1467 if (!nfs_file_has_buffered_writers(nfsi)) {
ca0daa27 1468 /* Verify a few of the more important attributes */
c472c07b 1469 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
16e14375
TM		 1470 invalid |= NFS_INO_INVALID_CHANGE
1471 | NFS_INO_REVAL_PAGECACHE;
1da177e4 1472
e86d5a02
TM		 1473 ts = inode->i_mtime;
1474 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
16e14375 1475 invalid |= NFS_INO_INVALID_MTIME;
ca62b9c3 1476
e86d5a02
TM		 1477 ts = inode->i_ctime;
1478 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
16e14375 1479 invalid |= NFS_INO_INVALID_CTIME;
ca0daa27
TM		 1480
1481 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1482 cur_size = i_size_read(inode);
1483 new_isize = nfs_size_to_loff_t(fattr->size);
1484 if (cur_size != new_isize)
16e14375
TM		 1485 invalid |= NFS_INO_INVALID_SIZE
1486 | NFS_INO_REVAL_PAGECACHE;
ca0daa27 1487 }
9e6e70f8 1488 }
1da177e4
LT		 1489
1490 /* Have any file permissions changed? */
9e6e70f8 1491 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
16e14375
TM		 1492 invalid |= NFS_INO_INVALID_ACCESS
1493 | NFS_INO_INVALID_ACL
1494 | NFS_INO_INVALID_OTHER;
9ff593c4 1495 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
16e14375
TM		 1496 invalid |= NFS_INO_INVALID_ACCESS
1497 | NFS_INO_INVALID_ACL
1498 | NFS_INO_INVALID_OTHER;
9ff593c4 1499 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
16e14375
TM		 1500 invalid |= NFS_INO_INVALID_ACCESS
1501 | NFS_INO_INVALID_ACL
1502 | NFS_INO_INVALID_OTHER;
1da177e4
LT		 1503
1504 /* Has the link count changed? */
9e6e70f8 1505 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
16e14375 1506 invalid |= NFS_INO_INVALID_OTHER;
1da177e4 1507
e86d5a02
TM		 1508 ts = inode->i_atime;
1509 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
2a3f5fd4
TM		 1510 invalid |= NFS_INO_INVALID_ATIME;
1511
1512 if (invalid != 0)
4ebe83af 1513 nfs_set_cache_invalid(inode, invalid);
1da177e4 1514
33801147 1515 nfsi->read_cache_jiffies = fattr->time_start;
1da177e4
LT		 1516 return 0;
1517}
1518
ae05f269 1519static atomic_long_t nfs_attr_generation_counter;
4704f0e2
TM		 1520
1521static unsigned long nfs_read_attr_generation_counter(void)
1522{
ae05f269 1523 return atomic_long_read(&nfs_attr_generation_counter);
4704f0e2
TM		 1524}
1525
1526unsigned long nfs_inc_attr_generation_counter(void)
1527{
ae05f269 1528 return atomic_long_inc_return(&nfs_attr_generation_counter);
4704f0e2 1529}
3235b403 1530EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
4704f0e2
TM		 1531
1532void nfs_fattr_init(struct nfs_fattr *fattr)
1533{
1534 fattr->valid = 0;
1535 fattr->time_start = jiffies;
1536 fattr->gencount = nfs_inc_attr_generation_counter();
6926afd1
TM		 1537 fattr->owner_name = NULL;
1538 fattr->group_name = NULL;
4704f0e2 1539}
ddda8e0a 1540EXPORT_SYMBOL_GPL(nfs_fattr_init);
4704f0e2 1541
140e049c
TM		 1542/**
1543 * nfs_fattr_set_barrier
1544 * @fattr: attributes
1545 *
1546 * Used to set a barrier after an attribute was updated. This
1547 * barrier ensures that older attributes from RPC calls that may
1548 * have raced with our update cannot clobber these new values.
1549 * Note that you are still responsible for ensuring that other
1550 * operations which change the attribute on the server do not
1551 * collide.
1552 */
1553void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1554{
1555 fattr->gencount = nfs_inc_attr_generation_counter();
1556}
1557
2d36bfde
TM		 1558struct nfs_fattr *nfs_alloc_fattr(void)
1559{
1560 struct nfs_fattr *fattr;
1561
1562 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1563 if (fattr != NULL)
1564 nfs_fattr_init(fattr);
1565 return fattr;
1566}
ddda8e0a 1567EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
2d36bfde
TM		 1568
1569struct nfs_fh *nfs_alloc_fhandle(void)
1570{
1571 struct nfs_fh *fh;
1572
1573 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1574 if (fh != NULL)
1575 fh->size = 0;
1576 return fh;
1577}
ddda8e0a 1578EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
2d36bfde 1579
e27d359e 1580#ifdef NFS_DEBUG
d8e0539e
WAA		 1581/*
1582 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1583 * in the same way that wireshark does
1584 *
1585 * @fh: file handle
1586 *
1587 * For debugging only.
1588 */
1589u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1590{
1591 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1592 * not on the result */
1264a2f0 1593 return nfs_fhandle_hash(fh);
d8e0539e 1594}
9e6ee76d 1595EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
d8e0539e
WAA		 1596
1597/*
20d27e92
CL		 1598 * _nfs_display_fhandle - display an NFS file handle on the console
1599 *
1600 * @fh: file handle to display
1601 * @caption: display caption
1602 *
1603 * For debugging only.
1604 */
20d27e92
CL		 1605void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1606{
1607 unsigned short i;
1608
fa68a1ba 1609 if (fh == NULL || fh->size == 0) {
20d27e92
CL		 1610 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1611 return;
1612 }
1613
d8e0539e
WAA		 1614 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1615 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
20d27e92
CL		 1616 for (i = 0; i < fh->size; i += 16) {
1617 __be32 *pos = (__be32 *)&fh->data[i];
1618
1619 switch ((fh->size - i - 1) >> 2) {
1620 case 0:
1621 printk(KERN_DEFAULT " %08x\n",
1622 be32_to_cpup(pos));
1623 break;
1624 case 1:
1625 printk(KERN_DEFAULT " %08x %08x\n",
1626 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1627 break;
1628 case 2:
1629 printk(KERN_DEFAULT " %08x %08x %08x\n",
1630 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1631 be32_to_cpup(pos + 2));
1632 break;
1633 default:
1634 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1635 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1636 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1637 }
1638 }
1639}
9e6ee76d 1640EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
20d27e92
CL		 1641#endif
1642
a10ad176
TM		 1643/**
1644 * nfs_inode_attrs_need_update - check if the inode attributes need updating
302fad7b
TM		 1645 * @inode: pointer to inode
1646 * @fattr: attributes
a10ad176
TM		 1647 *
1648 * Attempt to divine whether or not an RPC call reply carrying stale
1649 * attributes got scheduled after another call carrying updated ones.
1650 *
1651 * To do so, the function first assumes that a more recent ctime means
1652 * that the attributes in fattr are newer, however it also attempt to
1653 * catch the case where ctime either didn't change, or went backwards
1654 * (if someone reset the clock on the server) by looking at whether
1655 * or not this RPC call was started after the inode was last updated.
4704f0e2 1656 * Note also the check for wraparound of 'attr_gencount'
a10ad176
TM		 1657 *
1658 * The function returns 'true' if it thinks the attributes in 'fattr' are
1659 * more recent than the ones cached in the inode.
1660 *
1661 */
1662static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1663{
1664 const struct nfs_inode *nfsi = NFS_I(inode);
1665
4704f0e2 1666 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
4704f0e2 1667 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
a10ad176
TM		 1668}
1669
1670static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1671{
f4ce1299
TM		 1672 int ret;
1673
1674 trace_nfs_refresh_inode_enter(inode);
1675
a10ad176 1676 if (nfs_inode_attrs_need_update(inode, fattr))
f4ce1299
TM		 1677 ret = nfs_update_inode(inode, fattr);
1678 else
1679 ret = nfs_check_inode_attributes(inode, fattr);
1680
1681 trace_nfs_refresh_inode_exit(inode, ret);
1682 return ret;
870a5be8
TM		 1683}
1684
33801147
TM		 1685/**
1686 * nfs_refresh_inode - try to update the inode attribute cache
302fad7b
TM		 1687 * @inode: pointer to inode
1688 * @fattr: updated attributes
33801147
TM		 1689 *
1690 * Check that an RPC call that returned attributes has not overlapped with
1691 * other recent updates of the inode metadata, then decide whether it is
1692 * safe to do a full update of the inode attributes, or whether just to
1693 * call nfs_check_inode_attributes.
1694 */
1695int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1696{
33801147
TM		 1697 int status;
1698
1699 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1700 return 0;
1701 spin_lock(&inode->i_lock);
870a5be8 1702 status = nfs_refresh_inode_locked(inode, fattr);
33801147 1703 spin_unlock(&inode->i_lock);
ef79c097 1704
33801147
TM		 1705 return status;
1706}
ddda8e0a 1707EXPORT_SYMBOL_GPL(nfs_refresh_inode);
33801147 1708
16e14375
TM		 1709static int nfs_post_op_update_inode_locked(struct inode *inode,
1710 struct nfs_fattr *fattr, unsigned int invalid)
d65f557f 1711{
6edf9609
TM		 1712 if (S_ISDIR(inode->i_mode))
1713 invalid |= NFS_INO_INVALID_DATA;
1714 nfs_set_cache_invalid(inode, invalid);
d65f557f
TM		 1715 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1716 return 0;
1717 return nfs_refresh_inode_locked(inode, fattr);
1718}
1719
decf491f
TM		 1720/**
1721 * nfs_post_op_update_inode - try to update the inode attribute cache
302fad7b
TM		 1722 * @inode: pointer to inode
1723 * @fattr: updated attributes
decf491f
TM		 1724 *
1725 * After an operation that has changed the inode metadata, mark the
1726 * attribute cache as being invalid, then try to update it.
f551e44f
CL		 1727 *
1728 * NB: if the server didn't return any post op attributes, this
1729 * function will force the retrieval of attributes before the next
1730 * NFS request. Thus it should be used only for operations that
1731 * are expected to change one or more attributes, to avoid
1732 * unnecessary NFS requests and trips through nfs_update_inode().
decf491f
TM		 1733 */
1734int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1735{
d65f557f 1736 int status;
decf491f 1737
7668fdbe 1738 spin_lock(&inode->i_lock);
92d64e47 1739 nfs_fattr_set_barrier(fattr);
16e14375
TM		 1740 status = nfs_post_op_update_inode_locked(inode, fattr,
1741 NFS_INO_INVALID_CHANGE
d554168f
TM		 1742 | NFS_INO_INVALID_CTIME
1743 | NFS_INO_REVAL_FORCED);
7668fdbe 1744 spin_unlock(&inode->i_lock);
aa9c2669 1745
870a5be8 1746 return status;
decf491f 1747}
1c606fb7 1748EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
decf491f 1749
70ca8852 1750/**
a08a8cd3 1751 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
302fad7b
TM		 1752 * @inode: pointer to inode
1753 * @fattr: updated attributes
70ca8852
TM		 1754 *
1755 * After an operation that has changed the inode metadata, mark the
1756 * attribute cache as being invalid, then try to update it. Fake up
1757 * weak cache consistency data, if none exist.
1758 *
1759 * This function is mainly designed to be used by the ->write_done() functions.
1760 */
a08a8cd3 1761int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
70ca8852 1762{
d65f557f
TM		 1763 int status;
1764
d65f557f
TM		 1765 /* Don't do a WCC update if these attributes are already stale */
1766 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1767 !nfs_inode_attrs_need_update(inode, fattr)) {
9e6e70f8
TM		 1768 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1769 | NFS_ATTR_FATTR_PRESIZE
1770 | NFS_ATTR_FATTR_PREMTIME
1771 | NFS_ATTR_FATTR_PRECTIME);
d65f557f
TM		 1772 goto out_noforce;
1773 }
9e6e70f8
TM		 1774 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1775 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1eb5d98f 1776 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
9e6e70f8 1777 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
70ca8852 1778 }
9e6e70f8
TM		 1779 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1780 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
e86d5a02 1781 fattr->pre_ctime = inode->i_ctime;
9e6e70f8
TM		 1782 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1783 }
1784 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1785 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
e86d5a02 1786 fattr->pre_mtime = inode->i_mtime;
9e6e70f8
TM		 1787 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1788 }
1789 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1790 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
a3d01454 1791 fattr->pre_size = i_size_read(inode);
9e6e70f8 1792 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
70ca8852 1793 }
d65f557f 1794out_noforce:
16e14375
TM		 1795 status = nfs_post_op_update_inode_locked(inode, fattr,
1796 NFS_INO_INVALID_CHANGE
1797 | NFS_INO_INVALID_CTIME
3a39e778
ZB		 1798 | NFS_INO_INVALID_MTIME
1799 | NFS_INO_INVALID_BLOCKS);
a08a8cd3
TM		 1800 return status;
1801}
1802
1803/**
1804 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
302fad7b
TM		 1805 * @inode: pointer to inode
1806 * @fattr: updated attributes
a08a8cd3
TM		 1807 *
1808 * After an operation that has changed the inode metadata, mark the
1809 * attribute cache as being invalid, then try to update it. Fake up
1810 * weak cache consistency data, if none exist.
1811 *
1812 * This function is mainly designed to be used by the ->write_done() functions.
1813 */
1814int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1815{
1816 int status;
1817
1818 spin_lock(&inode->i_lock);
8f8ba1d7 1819 nfs_fattr_set_barrier(fattr);
a08a8cd3 1820 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
d65f557f
TM		 1821 spin_unlock(&inode->i_lock);
1822 return status;
70ca8852 1823}
ddda8e0a 1824EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
70ca8852 1825
ea96d1ec 1826
1da177e4
LT		 1827/*
1828 * Many nfs protocol calls return the new file attributes after
1829 * an operation. Here we update the inode to reflect the state
1830 * of the server's inode.
1831 *
1832 * This is a bit tricky because we have to make sure all dirty pages
1833 * have been sent off to the server before calling invalidate_inode_pages.
1834 * To make sure no other process adds more write requests while we try
1835 * our best to flush them, we make them sleep during the attribute refresh.
1836 *
1837 * A very similar scenario holds for the dir cache.
1838 */
24aa1fe6 1839static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1da177e4 1840{
8b4bdcf8 1841 struct nfs_server *server;
1da177e4 1842 struct nfs_inode *nfsi = NFS_I(inode);
951a143b 1843 loff_t cur_isize, new_isize;
2a3f5fd4 1844 unsigned long invalid = 0;
3e7d950a 1845 unsigned long now = jiffies;
62ab460c 1846 unsigned long save_cache_validity;
651b0e70 1847 bool have_writers = nfs_file_has_buffered_writers(nfsi);
944171cb 1848 bool cache_revalidated = true;
0b467264 1849 bool attr_changed = false;
c80d17c5 1850 bool have_delegation;
1da177e4 1851
1e8968c5 1852 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
3110ff80 1853 __func__, inode->i_sb->s_id, inode->i_ino,
4f1abd22 1854 nfs_display_fhandle_hash(NFS_FH(inode)),
1da177e4
LT		 1855 atomic_read(&inode->i_count), fattr->valid);
1856
eb3d8f42
TM		 1857 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1858 /* Only a mounted-on-fileid? Just exit */
1859 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1860 return 0;
7e10cc25 1861 /* Has the inode gone and changed behind our back? */
eb3d8f42 1862 } else if (nfsi->fileid != fattr->fileid) {
7e10cc25
TM		 1863 /* Is this perhaps the mounted-on fileid? */
1864 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1865 nfsi->fileid == fattr->mounted_on_fileid)
1866 return 0;
e73e6c9e
MT		 1867 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1868 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1869 NFS_SERVER(inode)->nfs_client->cl_hostname,
1870 inode->i_sb->s_id, (long long)nfsi->fileid,
1871 (long long)fattr->fileid);
1872 goto out_err;
1873 }
1da177e4
LT		 1874
1875 /*
1876 * Make sure the inode's type hasn't changed.
1877 */
e73e6c9e
MT		 1878 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1879 /*
1880 * Big trouble! The inode has become a different object.
1881 */
1e8968c5 1882 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
e73e6c9e
MT		 1883 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1884 goto out_err;
1885 }
1da177e4 1886
8b4bdcf8 1887 server = NFS_SERVER(inode);
a0356862 1888 /* Update the fsid? */
9e6e70f8 1889 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
c37dcd33 1890 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
36d43a43 1891 !IS_AUTOMOUNT(inode))
8b4bdcf8
TM		 1892 server->fsid = fattr->fsid;
1893
c80d17c5
TM		 1894 /* Save the delegation state before clearing cache_validity */
1895 have_delegation = nfs_have_delegated_attributes(inode);
1896
1da177e4
LT		 1897 /*
1898 * Update the read time so we don't revalidate too often.
1899 */
33801147 1900 nfsi->read_cache_jiffies = fattr->time_start;
3e7d950a 1901
62ab460c
TM		 1902 save_cache_validity = nfsi->cache_validity;
1903 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1904 | NFS_INO_INVALID_ATIME
1905 | NFS_INO_REVAL_FORCED
3a39e778
ZB		 1906 | NFS_INO_REVAL_PAGECACHE
1907 | NFS_INO_INVALID_BLOCKS);
1da177e4 1908
a895b4a1 1909 /* Do atomic weak cache consistency updates */
783b194c 1910 nfs_wcc_update_inode(inode, fattr);
a895b4a1 1911
944171cb
BC		 1912 if (pnfs_layoutcommit_outstanding(inode)) {
1913 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1914 cache_revalidated = false;
1915 }
10b7e9ad 1916
47aabaa7 1917 /* More cache consistency checks */
9e6e70f8 1918 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
c472c07b 1919 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
38512aa9 1920 /* Could it be a race with writeback? */
c80d17c5 1921 if (!(have_writers || have_delegation)) {
0b467264 1922 invalid |= NFS_INO_INVALID_DATA
38512aa9 1923 | NFS_INO_INVALID_ACCESS
95ad37f9
FL		 1924 | NFS_INO_INVALID_ACL
1925 | NFS_INO_INVALID_XATTR;
cac88f94 1926 /* Force revalidate of all attributes */
16e14375
TM		 1927 save_cache_validity |= NFS_INO_INVALID_CTIME
1928 | NFS_INO_INVALID_MTIME
1929 | NFS_INO_INVALID_SIZE
1930 | NFS_INO_INVALID_OTHER;
38512aa9
TM		 1931 if (S_ISDIR(inode->i_mode))
1932 nfs_force_lookup_revalidate(inode);
c80d17c5
TM		 1933 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1934 inode->i_sb->s_id,
1935 inode->i_ino);
1c341b77
TM		 1936 } else if (!have_delegation)
1937 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1eb5d98f 1938 inode_set_iversion_raw(inode, fattr->change_attr);
0b467264 1939 attr_changed = true;
9e6e70f8 1940 }
ade14a7d 1941 } else {
8619ddd0 1942 nfsi->cache_validity |= save_cache_validity &
16e14375 1943 (NFS_INO_INVALID_CHANGE
8619ddd0
TM		 1944 | NFS_INO_REVAL_PAGECACHE
1945 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1946 cache_revalidated = false;
1947 }
9e6e70f8
TM		 1948
1949 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
e86d5a02 1950 inode->i_mtime = fattr->mtime;
ade14a7d 1951 } else if (server->caps & NFS_CAP_MTIME) {
43b6535e 1952 nfsi->cache_validity |= save_cache_validity &
16e14375 1953 (NFS_INO_INVALID_MTIME
62ab460c 1954 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1955 cache_revalidated = false;
1956 }
62ab460c 1957
9e6e70f8 1958 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
e86d5a02 1959 inode->i_ctime = fattr->ctime;
ade14a7d 1960 } else if (server->caps & NFS_CAP_CTIME) {
43b6535e 1961 nfsi->cache_validity |= save_cache_validity &
16e14375 1962 (NFS_INO_INVALID_CTIME
62ab460c 1963 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1964 cache_revalidated = false;
1965 }
47aabaa7 1966
951a143b 1967 /* Check if our cached file size is stale */
9e6e70f8
TM		 1968 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1969 new_isize = nfs_size_to_loff_t(fattr->size);
1970 cur_isize = i_size_read(inode);
c80d17c5 1971 if (new_isize != cur_isize && !have_delegation) {
9e6e70f8
TM		 1972 /* Do we perhaps have any outstanding writes, or has
1973 * the file grown beyond our last write? */
a6b6d5b8 1974 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
9e6e70f8 1975 i_size_write(inode, new_isize);
ca0daa27 1976 if (!have_writers)
16e14375 1977 invalid |= NFS_INO_INVALID_DATA;
0b467264 1978 attr_changed = true;
9e6e70f8 1979 }
60c16ea8
HJ		 1980 dprintk("NFS: isize change on server for file %s/%ld "
1981 "(%Ld to %Ld)\n",
1982 inode->i_sb->s_id,
1983 inode->i_ino,
1984 (long long)cur_isize,
1985 (long long)new_isize);
1da177e4 1986 }
ade14a7d 1987 } else {
43b6535e 1988 nfsi->cache_validity |= save_cache_validity &
16e14375 1989 (NFS_INO_INVALID_SIZE
62ab460c
TM		 1990 | NFS_INO_REVAL_PAGECACHE
1991 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1992 cache_revalidated = false;
1993 }
1da177e4 1994
1da177e4 1995
9e6e70f8 1996 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
e86d5a02 1997 inode->i_atime = fattr->atime;
ade14a7d 1998 else if (server->caps & NFS_CAP_ATIME) {
43b6535e
TM		 1999 nfsi->cache_validity |= save_cache_validity &
2000 (NFS_INO_INVALID_ATIME
62ab460c 2001 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2002 cache_revalidated = false;
2003 }
1da177e4 2004
9e6e70f8
TM		 2005 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2006 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
9b4b3513
TM		 2007 umode_t newmode = inode->i_mode & S_IFMT;
2008 newmode |= fattr->mode & S_IALLUGO;
2009 inode->i_mode = newmode;
16e14375 2010 invalid |= NFS_INO_INVALID_ACCESS
0b467264
TM		 2011 | NFS_INO_INVALID_ACL;
2012 attr_changed = true;
9e6e70f8 2013 }
ade14a7d 2014 } else if (server->caps & NFS_CAP_MODE) {
43b6535e 2015 nfsi->cache_validity |= save_cache_validity &
0b467264 2016 (NFS_INO_INVALID_OTHER
62ab460c 2017 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2018 cache_revalidated = false;
2019 }
62ab460c 2020
9e6e70f8 2021 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
9ff593c4 2022 if (!uid_eq(inode->i_uid, fattr->uid)) {
16e14375 2023 invalid |= NFS_INO_INVALID_ACCESS
0b467264 2024 | NFS_INO_INVALID_ACL;
9e6e70f8 2025 inode->i_uid = fattr->uid;
0b467264 2026 attr_changed = true;
9e6e70f8 2027 }
ade14a7d 2028 } else if (server->caps & NFS_CAP_OWNER) {
43b6535e 2029 nfsi->cache_validity |= save_cache_validity &
0b467264 2030 (NFS_INO_INVALID_OTHER
62ab460c 2031 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2032 cache_revalidated = false;
2033 }
62ab460c 2034
9e6e70f8 2035 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
9ff593c4 2036 if (!gid_eq(inode->i_gid, fattr->gid)) {
16e14375 2037 invalid |= NFS_INO_INVALID_ACCESS
0b467264 2038 | NFS_INO_INVALID_ACL;
9e6e70f8 2039 inode->i_gid = fattr->gid;
0b467264 2040 attr_changed = true;
9e6e70f8 2041 }
ade14a7d 2042 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
43b6535e 2043 nfsi->cache_validity |= save_cache_validity &
0b467264 2044 (NFS_INO_INVALID_OTHER
62ab460c 2045 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2046 cache_revalidated = false;
2047 }
921615f1 2048
9e6e70f8
TM		 2049 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2050 if (inode->i_nlink != fattr->nlink) {
9e6e70f8
TM		 2051 if (S_ISDIR(inode->i_mode))
2052 invalid |= NFS_INO_INVALID_DATA;
bfe86848 2053 set_nlink(inode, fattr->nlink);
0b467264 2054 attr_changed = true;
9e6e70f8 2055 }
ade14a7d 2056 } else if (server->caps & NFS_CAP_NLINK) {
43b6535e 2057 nfsi->cache_validity |= save_cache_validity &
16e14375 2058 (NFS_INO_INVALID_OTHER
62ab460c 2059 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2060 cache_revalidated = false;
2061 }
1da177e4 2062
9e6e70f8 2063 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 2064 /*
2065 * report the blocks in 512byte units
2066 */
2067 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
ade14a7d 2068 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
9e6e70f8 2069 inode->i_blocks = fattr->du.nfs2.blocks;
3a39e778
ZB		 2070 else {
2071 nfsi->cache_validity |= save_cache_validity &
2072 (NFS_INO_INVALID_BLOCKS
2073 | NFS_INO_REVAL_FORCED);
ade14a7d 2074 cache_revalidated = false;
3a39e778 2075 }
1da177e4
LT		 2076
2077 /* Update attrtimeo value if we're out of the unstable period */
0b467264 2078 if (attr_changed) {
cac88f94 2079 invalid &= ~NFS_INO_INVALID_ATTR;
91d5b470 2080 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1da177e4 2081 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
3e7d950a 2082 nfsi->attrtimeo_timestamp = now;
f5062003 2083 /* Set barrier to be more recent than all outstanding updates */
4704f0e2 2084 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
6d2b2966 2085 } else {
ade14a7d
TM		 2086 if (cache_revalidated) {
2087 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2088 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2089 nfsi->attrtimeo <<= 1;
2090 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2091 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2092 }
6d2b2966
TM		 2093 nfsi->attrtimeo_timestamp = now;
2094 }
f5062003
TM		 2095 /* Set the barrier to be more recent than this fattr */
2096 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
2097 nfsi->attr_gencount = fattr->gencount;
1da177e4 2098 }
c812012f 2099
1da177e4
LT		 2100 /* Don't invalidate the data if we were to blame */
2101 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2102 || S_ISLNK(inode->i_mode)))
2103 invalid &= ~NFS_INO_INVALID_DATA;
c80d17c5 2104 nfs_set_cache_invalid(inode, invalid);
de242c0b 2105
1da177e4 2106 return 0;
b37b03b7 2107 out_err:
1da177e4
LT		 2108 /*
2109 * No need to worry about unhashing the dentry, as the
2110 * lookup validation will know that the inode is bad.
2111 * (But we fall through to invalidate the caches.)
2112 */
93ce4af7 2113 nfs_set_inode_stale_locked(inode);
1da177e4
LT		 2114 return -ESTALE;
2115}
2116
f7b422b1 2117struct inode *nfs_alloc_inode(struct super_block *sb)
1da177e4
LT		 2118{
2119 struct nfs_inode *nfsi;
c456aacf 2120 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1da177e4
LT		 2121 if (!nfsi)
2122 return NULL;
55296809
CL		 2123 nfsi->flags = 0UL;
2124 nfsi->cache_validity = 0UL;
89d77c8f 2125#if IS_ENABLED(CONFIG_NFS_V4)
e50a1c2e
BF		 2126 nfsi->nfs4_acl = NULL;
2127#endif /* CONFIG_NFS_V4 */
95ad37f9
FL		 2128#ifdef CONFIG_NFS_V4_2
2129 nfsi->xattr_cache = NULL;
2130#endif
1da177e4
LT		 2131 return &nfsi->vfs_inode;
2132}
89d77c8f 2133EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1da177e4 2134
ca1a199e 2135void nfs_free_inode(struct inode *inode)
1da177e4
LT		 2136{
2137 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2138}
ca1a199e 2139EXPORT_SYMBOL_GPL(nfs_free_inode);
fa0d7e3d 2140
d75d5414
AM		 2141static inline void nfs4_init_once(struct nfs_inode *nfsi)
2142{
89d77c8f 2143#if IS_ENABLED(CONFIG_NFS_V4)
d75d5414
AM		 2144 INIT_LIST_HEAD(&nfsi->open_states);
2145 nfsi->delegation = NULL;
d75d5414 2146 init_rwsem(&nfsi->rwsem);
e5e94017 2147 nfsi->layout = NULL;
d75d5414
AM		 2148#endif
2149}
f7b422b1 2150
51cc5068 2151static void init_once(void *foo)
1da177e4
LT		 2152{
2153 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2154
a35afb83 2155 inode_init_once(&nfsi->vfs_inode);
a35afb83
CL		 2156 INIT_LIST_HEAD(&nfsi->open_files);
2157 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2158 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
ea2cf228 2159 INIT_LIST_HEAD(&nfsi->commit_info.list);
a6b6d5b8 2160 atomic_long_set(&nfsi->nrequests, 0);
5cb953d4 2161 atomic_long_set(&nfsi->commit_info.ncommit, 0);
1a0de48a 2162 atomic_set(&nfsi->commit_info.rpcs_out, 0);
884be175 2163 init_rwsem(&nfsi->rmdir_sem);
e824f99a 2164 mutex_init(&nfsi->commit_mutex);
a35afb83 2165 nfs4_init_once(nfsi);
efeda80d 2166 nfsi->cache_change_attribute = 0;
1da177e4 2167}
20c2df83 2168
f7b422b1 2169static int __init nfs_init_inodecache(void)
1da177e4
LT		 2170{
2171 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2172 sizeof(struct nfs_inode),
fffb60f9 2173 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 2174 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 2175 init_once);
1da177e4
LT		 2176 if (nfs_inode_cachep == NULL)
2177 return -ENOMEM;
2178
2179 return 0;
2180}
2181
266bee88 2182static void nfs_destroy_inodecache(void)
1da177e4 2183{
8c0a8537
KS		 2184 /*
2185 * Make sure all delayed rcu free inodes are flushed before we
2186 * destroy cache.
2187 */
2188 rcu_barrier();
1a1d92c1 2189 kmem_cache_destroy(nfs_inode_cachep);
1da177e4
LT		 2190}
2191
5746006f 2192struct workqueue_struct *nfsiod_workqueue;
89d77c8f 2193EXPORT_SYMBOL_GPL(nfsiod_workqueue);
5746006f
TM		 2194
2195/*
2196 * start up the nfsiod workqueue
2197 */
2198static int nfsiod_start(void)
2199{
2200 struct workqueue_struct *wq;
2201 dprintk("RPC: creating workqueue nfsiod\n");
bf701b76 2202 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
5746006f
TM		 2203 if (wq == NULL)
2204 return -ENOMEM;
2205 nfsiod_workqueue = wq;
2206 return 0;
2207}
2208
2209/*
2210 * Destroy the nfsiod workqueue
2211 */
2212static void nfsiod_stop(void)
2213{
2214 struct workqueue_struct *wq;
2215
2216 wq = nfsiod_workqueue;
2217 if (wq == NULL)
2218 return;
2219 nfsiod_workqueue = NULL;
2220 destroy_workqueue(wq);
2221}
2222
c7d03a00 2223unsigned int nfs_net_id;
9e2e74db 2224EXPORT_SYMBOL_GPL(nfs_net_id);
1b340d01
SK		 2225
2226static int nfs_net_init(struct net *net)
2227{
6b13168b 2228 nfs_clients_init(net);
65b38851 2229 return nfs_fs_proc_net_init(net);
1b340d01
SK		 2230}
2231
2232static void nfs_net_exit(struct net *net)
2233{
65b38851 2234 nfs_fs_proc_net_exit(net);
10b7a70c 2235 nfs_clients_exit(net);
1b340d01
SK		 2236}
2237
2238static struct pernet_operations nfs_net_ops = {
2239 .init = nfs_net_init,
2240 .exit = nfs_net_exit,
2241 .id = &nfs_net_id,
2242 .size = sizeof(struct nfs_net),
2243};
2244
1da177e4
LT		 2245/*
2246 * Initialize NFS
2247 */
2248static int __init init_nfs_fs(void)
2249{
2250 int err;
2251
996bc4f4
TM		 2252 err = nfs_sysfs_init();
2253 if (err < 0)
2254 goto out10;
2255
1b340d01 2256 err = register_pernet_subsys(&nfs_net_ops);
e571cbf1 2257 if (err < 0)
89d77c8f 2258 goto out9;
e571cbf1 2259
8ec442ae
DH		 2260 err = nfs_fscache_register();
2261 if (err < 0)
89d77c8f 2262 goto out8;
8ec442ae 2263
5746006f
TM		 2264 err = nfsiod_start();
2265 if (err)
89d77c8f 2266 goto out7;
5746006f 2267
6aaca566
DH		 2268 err = nfs_fs_proc_init();
2269 if (err)
89d77c8f 2270 goto out6;
6aaca566 2271
1da177e4
LT		 2272 err = nfs_init_nfspagecache();
2273 if (err)
89d77c8f 2274 goto out5;
1da177e4
LT		 2275
2276 err = nfs_init_inodecache();
2277 if (err)
89d77c8f 2278 goto out4;
1da177e4
LT		 2279
2280 err = nfs_init_readpagecache();
2281 if (err)
89d77c8f 2282 goto out3;
1da177e4
LT		 2283
2284 err = nfs_init_writepagecache();
2285 if (err)
89d77c8f 2286 goto out2;
1da177e4 2287
1da177e4
LT		 2288 err = nfs_init_directcache();
2289 if (err)
89d77c8f 2290 goto out1;
1da177e4 2291
ec7652aa 2292 rpc_proc_register(&init_net, &nfs_rpcstat);
cd738ee9
KM		 2293
2294 err = register_nfs_fs();
2295 if (err)
129d1977
BS		 2296 goto out0;
2297
1da177e4 2298 return 0;
129d1977 2299out0:
ec7652aa 2300 rpc_proc_unregister(&init_net, "nfs");
1da177e4 2301 nfs_destroy_directcache();
89d77c8f 2302out1:
129d1977 2303 nfs_destroy_writepagecache();
89d77c8f 2304out2:
129d1977 2305 nfs_destroy_readpagecache();
89d77c8f 2306out3:
129d1977 2307 nfs_destroy_inodecache();
89d77c8f 2308out4:
129d1977 2309 nfs_destroy_nfspagecache();
89d77c8f 2310out5:
129d1977 2311 nfs_fs_proc_exit();
89d77c8f 2312out6:
129d1977 2313 nfsiod_stop();
89d77c8f 2314out7:
129d1977 2315 nfs_fscache_unregister();
89d77c8f 2316out8:
129d1977 2317 unregister_pernet_subsys(&nfs_net_ops);
89d77c8f 2318out9:
996bc4f4
TM		 2319 nfs_sysfs_exit();
2320out10:
1da177e4
LT		 2321 return err;
2322}
2323
2324static void __exit exit_nfs_fs(void)
2325{
1da177e4 2326 nfs_destroy_directcache();
1da177e4
LT		 2327 nfs_destroy_writepagecache();
2328 nfs_destroy_readpagecache();
2329 nfs_destroy_inodecache();
2330 nfs_destroy_nfspagecache();
8ec442ae 2331 nfs_fscache_unregister();
1b340d01 2332 unregister_pernet_subsys(&nfs_net_ops);
ec7652aa 2333 rpc_proc_unregister(&init_net, "nfs");
f7b422b1 2334 unregister_nfs_fs();
6aaca566 2335 nfs_fs_proc_exit();
5746006f 2336 nfsiod_stop();
996bc4f4 2337 nfs_sysfs_exit();
1da177e4
LT		 2338}
2339
2340/* Not quite true; I just maintain it */
2341MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2342MODULE_LICENSE("GPL");
f43bf0be 2343module_param(enable_ino64, bool, 0644);
1da177e4
LT		 2344
2345module_init(init_nfs_fs)
2346module_exit(exit_nfs_fs)
Linux 6.x block layer and io_uring tree(s)