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Merge tag 'docs-5.7-2' of git://git.lwn.net/linux
[linux-block.git] / fs / nfs / inode.c
CommitLineData
09c434b8 1// SPDX-License-Identifier: GPL-2.0-only
1da177e4
LT		 2/*
3 * linux/fs/nfs/inode.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * nfs inode and superblock handling functions
8 *
526719ba 9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
1da177e4
LT		 10 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 *
12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
13 * J.S.Peatfield@damtp.cam.ac.uk
14 *
15 */
16
1da177e4
LT		 17#include <linux/module.h>
18#include <linux/init.h>
174cd4b1 19#include <linux/sched/signal.h>
1da177e4
LT		 20#include <linux/time.h>
21#include <linux/kernel.h>
22#include <linux/mm.h>
23#include <linux/string.h>
24#include <linux/stat.h>
25#include <linux/errno.h>
26#include <linux/unistd.h>
27#include <linux/sunrpc/clnt.h>
28#include <linux/sunrpc/stats.h>
4ece3a2d 29#include <linux/sunrpc/metrics.h>
1da177e4
LT		 30#include <linux/nfs_fs.h>
31#include <linux/nfs_mount.h>
32#include <linux/nfs4_mount.h>
33#include <linux/lockd/bind.h>
1da177e4
LT		 34#include <linux/seq_file.h>
35#include <linux/mount.h>
1da177e4 36#include <linux/vfs.h>
9cdb3883
MN		 37#include <linux/inet.h>
38#include <linux/nfs_xdr.h>
5a0e3ad6 39#include <linux/slab.h>
3fa0b4e2 40#include <linux/compat.h>
d310310c 41#include <linux/freezer.h>
7c0f6ba6 42#include <linux/uaccess.h>
1eb5d98f 43#include <linux/iversion.h>
1da177e4 44
4ce79717 45#include "nfs4_fs.h"
a72b4422 46#include "callback.h"
1da177e4 47#include "delegation.h"
d9ef5a8c 48#include "iostat.h"
f7b422b1 49#include "internal.h"
8ec442ae 50#include "fscache.h"
e5e94017 51#include "pnfs.h"
ab7017a3 52#include "nfs.h"
1b340d01 53#include "netns.h"
996bc4f4 54#include "sysfs.h"
1da177e4 55
f4ce1299
TM		 56#include "nfstrace.h"
57
1da177e4 58#define NFSDBG_FACILITY NFSDBG_VFS
1da177e4 59
f43bf0be
TM		 60#define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
61
62/* Default is to see 64-bit inode numbers */
90ab5ee9 63static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
f43bf0be 64
24aa1fe6 65static int nfs_update_inode(struct inode *, struct nfs_fattr *);
1da177e4 66
e18b890b 67static struct kmem_cache * nfs_inode_cachep;
b7fa0554 68
1da177e4
LT		 69static inline unsigned long
70nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
71{
72 return nfs_fileid_to_ino_t(fattr->fileid);
73}
74
210c7c17 75static int nfs_wait_killable(int mode)
72cb77f4 76{
416ad3c9 77 freezable_schedule_unsafe();
dfd01f02
PZ		 78 if (signal_pending_state(mode, current))
79 return -ERESTARTSYS;
72cb77f4
TM		 80 return 0;
81}
210c7c17
BC		 82
83int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
84{
85 return nfs_wait_killable(mode);
86}
89d77c8f 87EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
72cb77f4 88
f43bf0be
TM		 89/**
90 * nfs_compat_user_ino64 - returns the user-visible inode number
91 * @fileid: 64-bit fileid
92 *
93 * This function returns a 32-bit inode number if the boot parameter
94 * nfs.enable_ino64 is zero.
95 */
96u64 nfs_compat_user_ino64(u64 fileid)
97{
3fa0b4e2
FF		 98#ifdef CONFIG_COMPAT
99 compat_ulong_t ino;
100#else
101 unsigned long ino;
102#endif
f43bf0be
TM		 103
104 if (enable_ino64)
105 return fileid;
106 ino = fileid;
107 if (sizeof(ino) < sizeof(fileid))
108 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
109 return ino;
110}
111
eed99357
TM		 112int nfs_drop_inode(struct inode *inode)
113{
114 return NFS_STALE(inode) || generic_drop_inode(inode);
115}
116EXPORT_SYMBOL_GPL(nfs_drop_inode);
117
19d87ca3 118void nfs_clear_inode(struct inode *inode)
1da177e4 119{
da6d503a
TM		 120 /*
121 * The following should never happen...
122 */
f48407dd
TM		 123 WARN_ON_ONCE(nfs_have_writebacks(inode));
124 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
ada70d94 125 nfs_zap_acl_cache(inode);
1c3c07e9 126 nfs_access_zap_cache(inode);
f1fe29b4 127 nfs_fscache_clear_inode(inode);
1da177e4 128}
89d77c8f 129EXPORT_SYMBOL_GPL(nfs_clear_inode);
1da177e4 130
b57922d9
AV		 131void nfs_evict_inode(struct inode *inode)
132{
91b0abe3 133 truncate_inode_pages_final(&inode->i_data);
dbd5768f 134 clear_inode(inode);
b57922d9
AV		 135 nfs_clear_inode(inode);
136}
137
9e1681c2 138int nfs_sync_inode(struct inode *inode)
4d346bea 139{
95d9f6c3 140 inode_dio_wait(inode);
4d346bea
TM		 141 return nfs_wb_all(inode);
142}
9e1681c2 143EXPORT_SYMBOL_GPL(nfs_sync_inode);
4d346bea 144
29884df0
TM		 145/**
146 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
302fad7b 147 * @mapping: pointer to struct address_space
29884df0
TM		 148 */
149int nfs_sync_mapping(struct address_space *mapping)
150{
5cf95214 151 int ret = 0;
29884df0 152
5cf95214
TM		 153 if (mapping->nrpages != 0) {
154 unmap_mapping_range(mapping, 0, 0, 0);
155 ret = nfs_wb_all(mapping->host);
156 }
29884df0
TM		 157 return ret;
158}
159
187e593d
TM		 160static int nfs_attribute_timeout(struct inode *inode)
161{
162 struct nfs_inode *nfsi = NFS_I(inode);
163
164 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
165}
166
61540bf6
TM		 167static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
168{
169 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
170
171 /* Special case for the pagecache or access cache */
172 if (flags == NFS_INO_REVAL_PAGECACHE &&
173 !(cache_validity & NFS_INO_REVAL_FORCED))
174 return false;
175 return (cache_validity & flags) != 0;
176}
177
178static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
179{
180 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
181
182 if ((cache_validity & flags) != 0)
183 return true;
184 if (nfs_attribute_timeout(inode))
185 return true;
186 return false;
187}
188
189bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
190{
191 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
192 return nfs_check_cache_invalid_delegated(inode, flags);
193
194 return nfs_check_cache_invalid_not_delegated(inode, flags);
195}
196
6edf9609
TM		 197static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
198{
199 struct nfs_inode *nfsi = NFS_I(inode);
3f0b3cf4
TM		 200 bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
201
202 if (have_delegation) {
203 if (!(flags & NFS_INO_REVAL_FORCED))
204 flags &= ~NFS_INO_INVALID_OTHER;
205 flags &= ~(NFS_INO_INVALID_CHANGE
206 | NFS_INO_INVALID_SIZE
207 | NFS_INO_REVAL_PAGECACHE);
208 }
6edf9609
TM		 209
210 if (inode->i_mapping->nrpages == 0)
1c341b77 211 flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER);
6edf9609
TM		 212 nfsi->cache_validity |= flags;
213 if (flags & NFS_INO_INVALID_DATA)
214 nfs_fscache_invalidate(inode);
215}
216
1da177e4
LT		 217/*
218 * Invalidate the local caches
219 */
b37b03b7 220static void nfs_zap_caches_locked(struct inode *inode)
1da177e4
LT		 221{
222 struct nfs_inode *nfsi = NFS_I(inode);
223 int mode = inode->i_mode;
224
91d5b470
CL		 225 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
226
c7c20973
TM		 227 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
228 nfsi->attrtimeo_timestamp = jiffies;
1da177e4 229
c3f52af3 230 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
de242c0b 231 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
6edf9609 232 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 233 | NFS_INO_INVALID_DATA
234 | NFS_INO_INVALID_ACCESS
235 | NFS_INO_INVALID_ACL
6edf9609 236 | NFS_INO_REVAL_PAGECACHE);
aa9c2669 237 } else
6edf9609 238 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 239 | NFS_INO_INVALID_ACCESS
240 | NFS_INO_INVALID_ACL
6edf9609 241 | NFS_INO_REVAL_PAGECACHE);
fd1defc2 242 nfs_zap_label_cache_locked(nfsi);
b37b03b7 243}
dc59250c 244
b37b03b7
TM		 245void nfs_zap_caches(struct inode *inode)
246{
247 spin_lock(&inode->i_lock);
248 nfs_zap_caches_locked(inode);
dc59250c 249 spin_unlock(&inode->i_lock);
ada70d94
TM		 250}
251
cd9ae2b6
TM		 252void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
253{
254 if (mapping->nrpages != 0) {
255 spin_lock(&inode->i_lock);
6edf9609 256 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
cd9ae2b6
TM		 257 spin_unlock(&inode->i_lock);
258 }
259}
260
f41f7418 261void nfs_zap_acl_cache(struct inode *inode)
ada70d94
TM		 262{
263 void (*clear_acl_cache)(struct inode *);
264
265 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
266 if (clear_acl_cache != NULL)
267 clear_acl_cache(inode);
dc59250c 268 spin_lock(&inode->i_lock);
55296809 269 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
dc59250c 270 spin_unlock(&inode->i_lock);
1da177e4 271}
1c606fb7 272EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
1da177e4 273
c4812998
TM		 274void nfs_invalidate_atime(struct inode *inode)
275{
276 spin_lock(&inode->i_lock);
6edf9609 277 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
c4812998
TM		 278 spin_unlock(&inode->i_lock);
279}
ddda8e0a 280EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
c4812998 281
1da177e4 282/*
b37b03b7
TM		 283 * Invalidate, but do not unhash, the inode.
284 * NB: must be called with inode->i_lock held!
1da177e4 285 */
93ce4af7 286static void nfs_set_inode_stale_locked(struct inode *inode)
1da177e4 287{
3a10c30a 288 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
b37b03b7 289 nfs_zap_caches_locked(inode);
93ce4af7
TM		 290 trace_nfs_set_inode_stale(inode);
291}
292
293void nfs_set_inode_stale(struct inode *inode)
294{
295 spin_lock(&inode->i_lock);
296 nfs_set_inode_stale_locked(inode);
297 spin_unlock(&inode->i_lock);
1da177e4
LT		 298}
299
300struct nfs_find_desc {
301 struct nfs_fh *fh;
302 struct nfs_fattr *fattr;
303};
304
305/*
306 * In NFSv3 we can have 64bit inode numbers. In order to support
307 * this, and re-exported directories (also seen in NFSv2)
308 * we are forced to allow 2 different inodes to have the same
309 * i_ino.
310 */
311static int
312nfs_find_actor(struct inode *inode, void *opaque)
313{
314 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
315 struct nfs_fh *fh = desc->fh;
316 struct nfs_fattr *fattr = desc->fattr;
317
318 if (NFS_FILEID(inode) != fattr->fileid)
319 return 0;
f6488c9b
JL		 320 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
321 return 0;
1da177e4
LT		 322 if (nfs_compare_fh(NFS_FH(inode), fh))
323 return 0;
324 if (is_bad_inode(inode) || NFS_STALE(inode))
325 return 0;
326 return 1;
327}
328
329static int
330nfs_init_locked(struct inode *inode, void *opaque)
331{
332 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
333 struct nfs_fattr *fattr = desc->fattr;
334
99fadcd7 335 set_nfs_fileid(inode, fattr->fileid);
916ec34d 336 inode->i_mode = fattr->mode;
1da177e4
LT		 337 nfs_copy_fh(NFS_FH(inode), desc->fh);
338 return 0;
339}
340
e058f70b 341#ifdef CONFIG_NFS_V4_SECURITY_LABEL
fd1defc2
TM		 342static void nfs_clear_label_invalid(struct inode *inode)
343{
344 spin_lock(&inode->i_lock);
345 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
346 spin_unlock(&inode->i_lock);
347}
348
aa9c2669
DQ		 349void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
350 struct nfs4_label *label)
351{
352 int error;
353
354 if (label == NULL)
355 return;
356
aa9c2669
DQ		 357 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
358 error = security_inode_notifysecctx(inode, label->label,
359 label->len);
360 if (error)
361 printk(KERN_ERR "%s() %s %d "
362 "security_inode_notifysecctx() %d\n",
363 __func__,
364 (char *)label->label,
365 label->len, error);
fd1defc2 366 nfs_clear_label_invalid(inode);
aa9c2669
DQ		 367 }
368}
369
e058f70b
SD		 370struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
371{
372 struct nfs4_label *label = NULL;
373 int minor_version = server->nfs_client->cl_minorversion;
374
375 if (minor_version < 2)
376 return label;
377
378 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
379 return label;
380
381 label = kzalloc(sizeof(struct nfs4_label), flags);
382 if (label == NULL)
383 return ERR_PTR(-ENOMEM);
384
385 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
386 if (label->label == NULL) {
387 kfree(label);
388 return ERR_PTR(-ENOMEM);
389 }
390 label->len = NFS4_MAXLABELLEN;
391
392 return label;
393}
394EXPORT_SYMBOL_GPL(nfs4_label_alloc);
aa9c2669 395#else
829e57d7 396void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
aa9c2669
DQ		 397 struct nfs4_label *label)
398{
399}
e058f70b 400#endif
aa9c2669 401EXPORT_SYMBOL_GPL(nfs_setsecurity);
e058f70b 402
f174ff7a
PT		 403/* Search for inode identified by fh, fileid and i_mode in inode cache. */
404struct inode *
405nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
406{
407 struct nfs_find_desc desc = {
408 .fh = fh,
409 .fattr = fattr,
410 };
411 struct inode *inode;
412 unsigned long hash;
413
414 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
415 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
416 return NULL;
417
418 hash = nfs_fattr_to_ino_t(fattr);
419 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
420
421 dprintk("%s: returning %p\n", __func__, inode);
422 return inode;
423}
424
1da177e4
LT		 425/*
426 * This is our front-end to iget that looks up inodes by file handle
427 * instead of inode number.
428 */
429struct inode *
1775fd3e 430nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
1da177e4
LT		 431{
432 struct nfs_find_desc desc = {
433 .fh = fh,
434 .fattr = fattr
435 };
03f28e3a 436 struct inode *inode = ERR_PTR(-ENOENT);
1da177e4
LT		 437 unsigned long hash;
438
7ebb9315
BS		 439 nfs_attr_check_mountpoint(sb, fattr);
440
2ef47eb1
AS		 441 if (nfs_attr_use_mounted_on_fileid(fattr))
442 fattr->fileid = fattr->mounted_on_fileid;
443 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
1da177e4 444 goto out_no_inode;
9e6e70f8 445 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
1da177e4 446 goto out_no_inode;
1da177e4
LT		 447
448 hash = nfs_fattr_to_ino_t(fattr);
449
03f28e3a
TM		 450 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
451 if (inode == NULL) {
452 inode = ERR_PTR(-ENOMEM);
1da177e4 453 goto out_no_inode;
03f28e3a 454 }
1da177e4
LT		 455
456 if (inode->i_state & I_NEW) {
457 struct nfs_inode *nfsi = NFS_I(inode);
b0c4fddc 458 unsigned long now = jiffies;
1da177e4
LT		 459
460 /* We set i_ino for the few things that still rely on it,
461 * such as stat(2) */
462 inode->i_ino = hash;
463
464 /* We can't support update_atime(), since the server will reset it */
465 inode->i_flags |= S_NOATIME|S_NOCMTIME;
466 inode->i_mode = fattr->mode;
821a868a 467 nfsi->cache_validity = 0;
62ab460c
TM		 468 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
469 && nfs_server_capable(inode, NFS_CAP_MODE))
16e14375 470 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
1da177e4
LT		 471 /* Why so? Because we want revalidate for devices/FIFOs, and
472 * that's precisely what we have in nfs_file_inode_operations.
473 */
8fa5c000 474 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
1da177e4 475 if (S_ISREG(inode->i_mode)) {
1788ea6e 476 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
1da177e4 477 inode->i_data.a_ops = &nfs_file_aops;
1da177e4 478 } else if (S_ISDIR(inode->i_mode)) {
8fa5c000 479 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
1da177e4 480 inode->i_fop = &nfs_dir_operations;
11de3b11 481 inode->i_data.a_ops = &nfs_dir_aops;
55a97593 482 /* Deal with crossing mountpoints */
7ebb9315
BS		 483 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
484 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
6b97fd3d
MN		 485 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
486 inode->i_op = &nfs_referral_inode_operations;
487 else
488 inode->i_op = &nfs_mountpoint_inode_operations;
55a97593 489 inode->i_fop = NULL;
36d43a43 490 inode->i_flags |= S_AUTOMOUNT;
55a97593 491 }
21fc61c7 492 } else if (S_ISLNK(inode->i_mode)) {
1da177e4 493 inode->i_op = &nfs_symlink_inode_operations;
21fc61c7
AV		 494 inode_nohighmem(inode);
495 } else
1da177e4
LT		 496 init_special_inode(inode, inode->i_mode, fattr->rdev);
497
9e6e70f8
TM		 498 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
499 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
500 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
1eb5d98f 501 inode_set_iversion_raw(inode, 0);
9e6e70f8 502 inode->i_size = 0;
6d6b77f1 503 clear_nlink(inode);
9ff593c4
EB		 504 inode->i_uid = make_kuid(&init_user_ns, -2);
505 inode->i_gid = make_kgid(&init_user_ns, -2);
9e6e70f8
TM		 506 inode->i_blocks = 0;
507 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
2701d086
AA		 508 nfsi->write_io = 0;
509 nfsi->read_io = 0;
9e6e70f8 510
33801147 511 nfsi->read_cache_jiffies = fattr->time_start;
4704f0e2 512 nfsi->attr_gencount = fattr->gencount;
9e6e70f8 513 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
e86d5a02 514 inode->i_atime = fattr->atime;
62ab460c 515 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
16e14375 516 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
9e6e70f8 517 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
e86d5a02 518 inode->i_mtime = fattr->mtime;
62ab460c 519 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
16e14375 520 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
9e6e70f8 521 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 522 inode->i_ctime = fattr->ctime;
62ab460c 523 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
16e14375 524 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
9e6e70f8 525 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1eb5d98f 526 inode_set_iversion_raw(inode, fattr->change_attr);
cd812599 527 else
16e14375 528 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
9e6e70f8
TM		 529 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
530 inode->i_size = nfs_size_to_loff_t(fattr->size);
62ab460c 531 else
16e14375 532 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
9e6e70f8 533 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
bfe86848 534 set_nlink(inode, fattr->nlink);
62ab460c 535 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
16e14375 536 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 537 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
538 inode->i_uid = fattr->uid;
62ab460c 539 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
16e14375 540 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 541 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
542 inode->i_gid = fattr->gid;
62ab460c 543 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
16e14375 544 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 545 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
546 inode->i_blocks = fattr->du.nfs2.blocks;
547 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 548 /*
549 * report the blocks in 512byte units
550 */
551 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1da177e4 552 }
aa9c2669 553
821a868a
TM		 554 if (nfsi->cache_validity != 0)
555 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
556
aa9c2669
DQ		 557 nfs_setsecurity(inode, fattr, label);
558
1da177e4 559 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
b0c4fddc 560 nfsi->attrtimeo_timestamp = now;
1c3c07e9 561 nfsi->access_cache = RB_ROOT;
1da177e4 562
f1fe29b4 563 nfs_fscache_init_inode(inode);
ef79c097 564
1da177e4 565 unlock_new_inode(inode);
26fde4df
N		 566 } else {
567 int err = nfs_refresh_inode(inode, fattr);
568 if (err < 0) {
569 iput(inode);
570 inode = ERR_PTR(err);
571 goto out_no_inode;
572 }
573 }
1e8968c5 574 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
1da177e4 575 inode->i_sb->s_id,
1e8968c5 576 (unsigned long long)NFS_FILEID(inode),
4f1abd22 577 nfs_display_fhandle_hash(fh),
1da177e4
LT		 578 atomic_read(&inode->i_count));
579
580out:
581 return inode;
582
583out_no_inode:
03f28e3a 584 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
1da177e4
LT		 585 goto out;
586}
89d77c8f 587EXPORT_SYMBOL_GPL(nfs_fhget);
1da177e4 588
536e43d1 589#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		 590
591int
592nfs_setattr(struct dentry *dentry, struct iattr *attr)
593{
2b0143b5 594 struct inode *inode = d_inode(dentry);
987f8dfc 595 struct nfs_fattr *fattr;
ae57ca0f 596 int error = 0;
1da177e4 597
91d5b470
CL		 598 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
599
188b95dd
JL		 600 /* skip mode change if it's just for clearing setuid/setgid */
601 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
602 attr->ia_valid &= ~ATTR_MODE;
603
1da177e4 604 if (attr->ia_valid & ATTR_SIZE) {
08a899d5
CH		 605 BUG_ON(!S_ISREG(inode->i_mode));
606
ae57ca0f
KM		 607 error = inode_newsize_ok(inode, attr->ia_size);
608 if (error)
609 return error;
610
611 if (attr->ia_size == i_size_read(inode))
1da177e4
LT		 612 attr->ia_valid &= ~ATTR_SIZE;
613 }
614
615 /* Optimization: if the end result is no change, don't RPC */
616 attr->ia_valid &= NFS_VALID_ATTRS;
536e43d1 617 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
1da177e4
LT		 618 return 0;
619
f4ce1299
TM		 620 trace_nfs_setattr_enter(inode);
621
755c1e20 622 /* Write all dirty data */
4d346bea
TM		 623 if (S_ISREG(inode->i_mode))
624 nfs_sync_inode(inode);
987f8dfc
TM		 625
626 fattr = nfs_alloc_fattr();
ae57ca0f
KM		 627 if (fattr == NULL) {
628 error = -ENOMEM;
987f8dfc 629 goto out;
ae57ca0f
KM		 630 }
631
987f8dfc 632 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
65e4308d 633 if (error == 0)
aa9c2669 634 error = nfs_refresh_inode(inode, fattr);
987f8dfc
TM		 635 nfs_free_fattr(fattr);
636out:
f4ce1299 637 trace_nfs_setattr_exit(inode, error);
65e4308d
TM		 638 return error;
639}
ddda8e0a 640EXPORT_SYMBOL_GPL(nfs_setattr);
65e4308d 641
a3d01454
TM		 642/**
643 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
644 * @inode: inode of the file used
645 * @offset: file offset to start truncating
646 *
647 * This is a copy of the common vmtruncate, but with the locking
648 * corrected to take into account the fact that NFS requires
649 * inode->i_size to be updated under the inode->i_lock.
f044636d 650 * Note: must be called with inode->i_lock held!
a3d01454
TM		 651 */
652static int nfs_vmtruncate(struct inode * inode, loff_t offset)
653{
c08d3b0e 654 int err;
a3d01454 655
c08d3b0e 656 err = inode_newsize_ok(inode, offset);
657 if (err)
658 goto out;
a3d01454 659
c08d3b0e 660 i_size_write(inode, offset);
6edf9609
TM		 661 /* Optimisation */
662 if (offset == 0)
1c341b77
TM		 663 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA |
664 NFS_INO_DATA_INVAL_DEFER);
f6cdfa6d 665 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
c08d3b0e 666
f044636d 667 spin_unlock(&inode->i_lock);
7caef267 668 truncate_pagecache(inode, offset);
f044636d 669 spin_lock(&inode->i_lock);
c08d3b0e 670out:
671 return err;
a3d01454
TM		 672}
673
65e4308d
TM		 674/**
675 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
676 * @inode: pointer to struct inode
677 * @attr: pointer to struct iattr
16e14375 678 * @fattr: pointer to struct nfs_fattr
65e4308d
TM		 679 *
680 * Note: we do this in the *proc.c in order to ensure that
681 * it works for things like exclusive creates too.
682 */
f044636d
TM		 683void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
684 struct nfs_fattr *fattr)
65e4308d 685{
f044636d
TM		 686 /* Barrier: bump the attribute generation count. */
687 nfs_fattr_set_barrier(fattr);
688
689 spin_lock(&inode->i_lock);
690 NFS_I(inode)->attr_gencount = fattr->gencount;
6a97d02d
TM		 691 if ((attr->ia_valid & ATTR_SIZE) != 0) {
692 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
693 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
694 nfs_vmtruncate(inode, attr->ia_size);
695 }
65e4308d 696 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
6a97d02d 697 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
1da177e4 698 if ((attr->ia_valid & ATTR_MODE) != 0) {
65e4308d
TM		 699 int mode = attr->ia_mode & S_IALLUGO;
700 mode |= inode->i_mode & ~S_IALLUGO;
1da177e4
LT		 701 inode->i_mode = mode;
702 }
703 if ((attr->ia_valid & ATTR_UID) != 0)
704 inode->i_uid = attr->ia_uid;
705 if ((attr->ia_valid & ATTR_GID) != 0)
706 inode->i_gid = attr->ia_gid;
6a97d02d 707 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 708 inode->i_ctime = fattr->ctime;
6a97d02d
TM		 709 else
710 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
711 | NFS_INO_INVALID_CTIME);
6edf9609
TM		 712 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
713 | NFS_INO_INVALID_ACL);
65e4308d 714 }
6a97d02d
TM		 715 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
716 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
717 | NFS_INO_INVALID_CTIME);
718 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
e86d5a02 719 inode->i_atime = fattr->atime;
6a97d02d
TM		 720 else if (attr->ia_valid & ATTR_ATIME_SET)
721 inode->i_atime = attr->ia_atime;
722 else
723 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
724
725 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 726 inode->i_ctime = fattr->ctime;
6a97d02d
TM		 727 else
728 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
729 | NFS_INO_INVALID_CTIME);
730 }
731 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
732 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
733 | NFS_INO_INVALID_CTIME);
734 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
e86d5a02 735 inode->i_mtime = fattr->mtime;
6a97d02d
TM		 736 else if (attr->ia_valid & ATTR_MTIME_SET)
737 inode->i_mtime = attr->ia_mtime;
738 else
739 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
740
741 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02 742 inode->i_ctime = fattr->ctime;
6a97d02d
TM		 743 else
744 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
745 | NFS_INO_INVALID_CTIME);
65e4308d 746 }
616c3196
JL		 747 if (fattr->valid)
748 nfs_update_inode(inode, fattr);
f044636d 749 spin_unlock(&inode->i_lock);
1da177e4 750}
ddda8e0a 751EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
1da177e4 752
1bcf4c5c 753static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
311324ad
TM		 754{
755 struct dentry *parent;
756
1bcf4c5c
TM		 757 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
758 return;
311324ad 759 parent = dget_parent(dentry);
2b0143b5 760 nfs_force_use_readdirplus(d_inode(parent));
311324ad
TM		 761 dput(parent);
762}
763
1bcf4c5c
TM		 764static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
765{
766 struct dentry *parent;
767
768 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
769 return;
770 parent = dget_parent(dentry);
771 nfs_advise_use_readdirplus(d_inode(parent));
772 dput(parent);
773}
774
311324ad
TM		 775static bool nfs_need_revalidate_inode(struct inode *inode)
776{
777 if (NFS_I(inode)->cache_validity &
778 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
779 return true;
780 if (nfs_attribute_cache_expired(inode))
781 return true;
782 return false;
783}
784
a528d35e
DH		 785int nfs_getattr(const struct path *path, struct kstat *stat,
786 u32 request_mask, unsigned int query_flags)
1da177e4 787{
a528d35e 788 struct inode *inode = d_inode(path->dentry);
9ccee940
TM		 789 struct nfs_server *server = NFS_SERVER(inode);
790 unsigned long cache_validity;
16caf5b6 791 int err = 0;
9ccee940
TM		 792 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
793 bool do_update = false;
1da177e4 794
f4ce1299 795 trace_nfs_getattr_enter(inode);
9ccee940
TM		 796
797 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync)
798 goto out_no_update;
799
acdc53b2 800 /* Flush out writes to the server in order to update c/mtime. */
9ccee940
TM		 801 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
802 S_ISREG(inode->i_mode)) {
79566ef0 803 err = filemap_write_and_wait(inode->i_mapping);
acdc53b2
TM		 804 if (err)
805 goto out;
28c494c5 806 }
fc33a7bb
CH		 807
808 /*
809 * We may force a getattr if the user cares about atime.
810 *
811 * Note that we only have to check the vfsmount flags here:
812 * - NFS always sets S_NOATIME by so checking it would give a
813 * bogus result
1751e8a6 814 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
fc33a7bb
CH		 815 * no point in checking those.
816 */
a528d35e
DH		 817 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
818 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
9ccee940
TM		 819 request_mask &= ~STATX_ATIME;
820
821 /* Is the user requesting attributes that might need revalidation? */
822 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
823 STATX_MTIME|STATX_UID|STATX_GID|
824 STATX_SIZE|STATX_BLOCKS)))
825 goto out_no_revalidate;
826
827 /* Check whether the cached attributes are stale */
828 do_update |= force_sync || nfs_attribute_cache_expired(inode);
829 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
830 do_update |= cache_validity &
831 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
832 if (request_mask & STATX_ATIME)
833 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
834 if (request_mask & (STATX_CTIME|STATX_MTIME))
835 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
836 if (do_update) {
837 /* Update the attribute cache */
59b86d85
HT		 838 if (!(server->flags & NFS_MOUNT_NOAC))
839 nfs_readdirplus_parent_cache_miss(path->dentry);
840 else
841 nfs_readdirplus_parent_cache_hit(path->dentry);
311324ad 842 err = __nfs_revalidate_inode(server, inode);
9ccee940
TM		 843 if (err)
844 goto out;
1bcf4c5c 845 } else
a528d35e 846 nfs_readdirplus_parent_cache_hit(path->dentry);
9ccee940
TM		 847out_no_revalidate:
848 /* Only return attributes that were revalidated. */
849 stat->result_mask &= request_mask;
850out_no_update:
851 generic_fillattr(inode, stat);
852 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
853 if (S_ISDIR(inode->i_mode))
854 stat->blksize = NFS_SERVER(inode)->dtsize;
acdc53b2 855out:
f4ce1299 856 trace_nfs_getattr_exit(inode, err);
1da177e4
LT		 857 return err;
858}
ddda8e0a 859EXPORT_SYMBOL_GPL(nfs_getattr);
1da177e4 860
f11ac8db
TM		 861static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
862{
2f62b5aa 863 refcount_set(&l_ctx->count, 1);
d51fdb87 864 l_ctx->lockowner = current->files;
f11ac8db 865 INIT_LIST_HEAD(&l_ctx->list);
210c7c17 866 atomic_set(&l_ctx->io_count, 0);
f11ac8db
TM		 867}
868
869static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
870{
1db97eaa 871 struct nfs_lock_context *pos;
f11ac8db 872
1db97eaa 873 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
d51fdb87 874 if (pos->lockowner != current->files)
f11ac8db 875 continue;
1db97eaa
TM		 876 if (refcount_inc_not_zero(&pos->count))
877 return pos;
878 }
f11ac8db
TM		 879 return NULL;
880}
881
882struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
883{
884 struct nfs_lock_context *res, *new = NULL;
2b0143b5 885 struct inode *inode = d_inode(ctx->dentry);
f11ac8db 886
1db97eaa 887 rcu_read_lock();
f11ac8db 888 res = __nfs_find_lock_context(ctx);
1db97eaa 889 rcu_read_unlock();
f11ac8db 890 if (res == NULL) {
f11ac8db
TM		 891 new = kmalloc(sizeof(*new), GFP_KERNEL);
892 if (new == NULL)
b3c54de6 893 return ERR_PTR(-ENOMEM);
f11ac8db
TM		 894 nfs_init_lock_context(new);
895 spin_lock(&inode->i_lock);
896 res = __nfs_find_lock_context(ctx);
897 if (res == NULL) {
15494511
TM		 898 new->open_context = get_nfs_open_context(ctx);
899 if (new->open_context) {
900 list_add_tail_rcu(&new->list,
901 &ctx->lock_context.list);
902 res = new;
903 new = NULL;
904 } else
905 res = ERR_PTR(-EBADF);
f11ac8db 906 }
1db97eaa
TM		 907 spin_unlock(&inode->i_lock);
908 kfree(new);
f11ac8db 909 }
f11ac8db
TM		 910 return res;
911}
1c6dcbe5 912EXPORT_SYMBOL_GPL(nfs_get_lock_context);
f11ac8db
TM		 913
914void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
915{
916 struct nfs_open_context *ctx = l_ctx->open_context;
2b0143b5 917 struct inode *inode = d_inode(ctx->dentry);
f11ac8db 918
2f62b5aa 919 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
f11ac8db 920 return;
1db97eaa 921 list_del_rcu(&l_ctx->list);
f11ac8db 922 spin_unlock(&inode->i_lock);
15494511 923 put_nfs_open_context(ctx);
1db97eaa 924 kfree_rcu(l_ctx, rcu_head);
f11ac8db 925}
1c6dcbe5 926EXPORT_SYMBOL_GPL(nfs_put_lock_context);
f11ac8db 927
7fe5c398
TM		 928/**
929 * nfs_close_context - Common close_context() routine NFSv2/v3
930 * @ctx: pointer to context
931 * @is_sync: is this a synchronous close
932 *
5cf9d706
TM		 933 * Ensure that the attributes are up to date if we're mounted
934 * with close-to-open semantics and we have cached data that will
935 * need to be revalidated on open.
7fe5c398
TM		 936 */
937void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
938{
5cf9d706 939 struct nfs_inode *nfsi;
7fe5c398
TM		 940 struct inode *inode;
941 struct nfs_server *server;
942
943 if (!(ctx->mode & FMODE_WRITE))
944 return;
945 if (!is_sync)
946 return;
2b0143b5 947 inode = d_inode(ctx->dentry);
58ff4184
TM		 948 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
949 return;
5cf9d706
TM		 950 nfsi = NFS_I(inode);
951 if (inode->i_mapping->nrpages == 0)
952 return;
953 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
954 return;
955 if (!list_empty(&nfsi->open_files))
7fe5c398
TM		 956 return;
957 server = NFS_SERVER(inode);
958 if (server->flags & NFS_MOUNT_NOCTO)
959 return;
960 nfs_revalidate_inode(server, inode);
961}
ddda8e0a 962EXPORT_SYMBOL_GPL(nfs_close_context);
7fe5c398 963
532d4def
N		 964struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
965 fmode_t f_mode,
966 struct file *filp)
1da177e4
LT		 967{
968 struct nfs_open_context *ctx;
969
f52720ca 970 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
1d179d6b 971 if (!ctx)
5ede7b1c 972 return ERR_PTR(-ENOMEM);
5ede7b1c
AV		 973 nfs_sb_active(dentry->d_sb);
974 ctx->dentry = dget(dentry);
1d179d6b
TM		 975 if (filp)
976 ctx->cred = get_cred(filp->f_cred);
977 else
978 ctx->cred = get_current_cred();
ddf529ee 979 ctx->ll_cred = NULL;
5ede7b1c
AV		 980 ctx->state = NULL;
981 ctx->mode = f_mode;
982 ctx->flags = 0;
983 ctx->error = 0;
532d4def 984 ctx->flock_owner = (fl_owner_t)filp;
5ede7b1c
AV		 985 nfs_init_lock_context(&ctx->lock_context);
986 ctx->lock_context.open_context = ctx;
987 INIT_LIST_HEAD(&ctx->list);
82be417a 988 ctx->mdsthreshold = NULL;
1da177e4
LT		 989 return ctx;
990}
89d77c8f 991EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1da177e4
LT		 992
993struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
994{
0de43976
TM		 995 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
996 return ctx;
997 return NULL;
1da177e4 998}
89d77c8f 999EXPORT_SYMBOL_GPL(get_nfs_open_context);
1da177e4 1000
7fe5c398 1001static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1da177e4 1002{
2b0143b5 1003 struct inode *inode = d_inode(ctx->dentry);
3d4ff43d 1004 struct super_block *sb = ctx->dentry->d_sb;
3bec63db 1005
0de43976
TM		 1006 if (!refcount_dec_and_test(&ctx->lock_context.count))
1007 return;
5c78f58e 1008 if (!list_empty(&ctx->list)) {
0de43976
TM		 1009 spin_lock(&inode->i_lock);
1010 list_del_rcu(&ctx->list);
ef84303e 1011 spin_unlock(&inode->i_lock);
0de43976 1012 }
5c78f58e
TM		 1013 if (inode != NULL)
1014 NFS_PROTO(inode)->close_context(ctx, is_sync);
a52458b4 1015 put_cred(ctx->cred);
3d4ff43d 1016 dput(ctx->dentry);
322b2b90 1017 nfs_sb_deactive(sb);
ddf529ee 1018 put_rpccred(ctx->ll_cred);
82be417a 1019 kfree(ctx->mdsthreshold);
0de43976 1020 kfree_rcu(ctx, rcu_head);
3bec63db
TM		 1021}
1022
a49c3c77
TM		 1023void put_nfs_open_context(struct nfs_open_context *ctx)
1024{
1025 __put_nfs_open_context(ctx, 0);
1026}
89d77c8f 1027EXPORT_SYMBOL_GPL(put_nfs_open_context);
a49c3c77 1028
4eae5014
TM		 1029static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1030{
1031 __put_nfs_open_context(ctx, 1);
1032}
1033
1da177e4
LT		 1034/*
1035 * Ensure that mmap has a recent RPC credential for use when writing out
1036 * shared pages
1037 */
c45ffdd2 1038void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1da177e4 1039{
2b0143b5 1040 struct inode *inode = d_inode(ctx->dentry);
1da177e4
LT		 1041 struct nfs_inode *nfsi = NFS_I(inode);
1042
1da177e4 1043 spin_lock(&inode->i_lock);
1c341b77
TM		 1044 if (list_empty(&nfsi->open_files) &&
1045 (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER))
1046 nfsi->cache_validity |= NFS_INO_INVALID_DATA |
1047 NFS_INO_REVAL_FORCED;
0de43976 1048 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1da177e4
LT		 1049 spin_unlock(&inode->i_lock);
1050}
c45ffdd2
TM		 1051EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1052
1053void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1054{
1055 filp->private_data = get_nfs_open_context(ctx);
1056 if (list_empty(&ctx->list))
1057 nfs_inode_attach_open_context(ctx);
1058}
89d77c8f 1059EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1da177e4 1060
d530838b
TM		 1061/*
1062 * Given an inode, search for an open context with the desired characteristics
1063 */
a52458b4 1064struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1da177e4
LT		 1065{
1066 struct nfs_inode *nfsi = NFS_I(inode);
1067 struct nfs_open_context *pos, *ctx = NULL;
1068
0de43976
TM		 1069 rcu_read_lock();
1070 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
65f51603 1071 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
d530838b 1072 continue;
1544fa0f
TM		 1073 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1074 continue;
1075 ctx = get_nfs_open_context(pos);
0de43976
TM		 1076 if (ctx)
1077 break;
1da177e4 1078 }
0de43976 1079 rcu_read_unlock();
1da177e4
LT		 1080 return ctx;
1081}
1082
aff8d8dc 1083void nfs_file_clear_open_context(struct file *filp)
1da177e4 1084{
cd3758e3 1085 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1da177e4
LT		 1086
1087 if (ctx) {
2b0143b5 1088 struct inode *inode = d_inode(ctx->dentry);
c45ffdd2 1089
0bcbf039
PT		 1090 /*
1091 * We fatal error on write before. Try to writeback
1092 * every page again.
1093 */
1094 if (ctx->error < 0)
1095 invalidate_inode_pages2(inode->i_mapping);
1da177e4 1096 filp->private_data = NULL;
4eae5014 1097 put_nfs_open_context_sync(ctx);
1da177e4
LT		 1098 }
1099}
1100
1101/*
1102 * These allocate and release file read/write context information.
1103 */
1104int nfs_open(struct inode *inode, struct file *filp)
1105{
1106 struct nfs_open_context *ctx;
1da177e4 1107
532d4def 1108 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
5ede7b1c
AV		 1109 if (IS_ERR(ctx))
1110 return PTR_ERR(ctx);
1da177e4
LT		 1111 nfs_file_set_open_context(filp, ctx);
1112 put_nfs_open_context(ctx);
f1fe29b4 1113 nfs_fscache_open_file(inode, filp);
1da177e4
LT		 1114 return 0;
1115}
44942b4e 1116EXPORT_SYMBOL_GPL(nfs_open);
1da177e4 1117
1da177e4
LT		 1118/*
1119 * This function is called whenever some part of NFS notices that
1120 * the cached attributes have to be refreshed.
1121 */
1122int
1123__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1124{
1125 int status = -ESTALE;
1775fd3e 1126 struct nfs4_label *label = NULL;
a3cba2aa 1127 struct nfs_fattr *fattr = NULL;
1da177e4 1128 struct nfs_inode *nfsi = NFS_I(inode);
1da177e4 1129
1e8968c5
NV		 1130 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1131 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1da177e4 1132
f4ce1299
TM		 1133 trace_nfs_revalidate_inode_enter(inode);
1134
85233a7a 1135 if (is_bad_inode(inode))
691beb13 1136 goto out;
1da177e4 1137 if (NFS_STALE(inode))
412d582e 1138 goto out;
7fdc49c4 1139
ac46bd37
TM		 1140 /* pNFS: Attributes aren't updated until we layoutcommit */
1141 if (S_ISREG(inode->i_mode)) {
1142 status = pnfs_sync_inode(inode, false);
1143 if (status)
1144 goto out;
1145 }
1146
a3cba2aa
TM		 1147 status = -ENOMEM;
1148 fattr = nfs_alloc_fattr();
1149 if (fattr == NULL)
1150 goto out;
1151
691beb13 1152 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
14c43f76
DQ		 1153
1154 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1155 if (IS_ERR(label)) {
1156 status = PTR_ERR(label);
1157 goto out;
1158 }
1159
a841b54d
TM		 1160 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1161 label, inode);
1da177e4 1162 if (status != 0) {
1e8968c5 1163 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1da177e4 1164 inode->i_sb->s_id,
1e8968c5 1165 (unsigned long long)NFS_FILEID(inode), status);
c74dfe97
TM		 1166 switch (status) {
1167 case -ETIMEDOUT:
1168 /* A soft timeout occurred. Use cached information? */
1169 if (server->flags & NFS_MOUNT_SOFTREVAL)
1170 status = 0;
1171 break;
1172 case -ESTALE:
1da177e4 1173 if (!S_ISDIR(inode->i_mode))
93ce4af7
TM		 1174 nfs_set_inode_stale(inode);
1175 else
1176 nfs_zap_caches(inode);
1da177e4 1177 }
14c43f76 1178 goto err_out;
1da177e4
LT		 1179 }
1180
a3cba2aa 1181 status = nfs_refresh_inode(inode, fattr);
1da177e4 1182 if (status) {
1e8968c5 1183 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1da177e4 1184 inode->i_sb->s_id,
1e8968c5 1185 (unsigned long long)NFS_FILEID(inode), status);
14c43f76 1186 goto err_out;
1da177e4 1187 }
55296809 1188
24aa1fe6 1189 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
ada70d94 1190 nfs_zap_acl_cache(inode);
55296809 1191
3da580aa
JL		 1192 nfs_setsecurity(inode, fattr, label);
1193
1e8968c5 1194 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1da177e4 1195 inode->i_sb->s_id,
1e8968c5 1196 (unsigned long long)NFS_FILEID(inode));
1da177e4 1197
14c43f76
DQ		 1198err_out:
1199 nfs4_label_free(label);
1200out:
a3cba2aa 1201 nfs_free_fattr(fattr);
f4ce1299 1202 trace_nfs_revalidate_inode_exit(inode, status);
1da177e4
LT		 1203 return status;
1204}
1205
43f291cd 1206int nfs_attribute_cache_expired(struct inode *inode)
d7cf8dd0 1207{
b4d2314b 1208 if (nfs_have_delegated_attributes(inode))
1da177e4 1209 return 0;
d7cf8dd0 1210 return nfs_attribute_timeout(inode);
1da177e4
LT		 1211}
1212
1213/**
1214 * nfs_revalidate_inode - Revalidate the inode attributes
302fad7b
TM		 1215 * @server: pointer to nfs_server struct
1216 * @inode: pointer to inode struct
1da177e4
LT		 1217 *
1218 * Updates inode attribute information by retrieving the data from the server.
1219 */
1220int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1221{
311324ad 1222 if (!nfs_need_revalidate_inode(inode))
1da177e4
LT		 1223 return NFS_STALE(inode) ? -ESTALE : 0;
1224 return __nfs_revalidate_inode(server, inode);
1225}
1c606fb7 1226EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1da177e4 1227
1cda707d 1228static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
717d44e8
TM		 1229{
1230 struct nfs_inode *nfsi = NFS_I(inode);
f8806c84
TM		 1231 int ret;
1232
717d44e8 1233 if (mapping->nrpages != 0) {
f8806c84
TM		 1234 if (S_ISREG(inode->i_mode)) {
1235 ret = nfs_sync_mapping(mapping);
1236 if (ret < 0)
1237 return ret;
1238 }
1239 ret = invalidate_inode_pages2(mapping);
717d44e8
TM		 1240 if (ret < 0)
1241 return ret;
1242 }
d529ef83
JL		 1243 if (S_ISDIR(inode->i_mode)) {
1244 spin_lock(&inode->i_lock);
717d44e8 1245 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
d529ef83
JL		 1246 spin_unlock(&inode->i_lock);
1247 }
717d44e8 1248 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
de242c0b 1249 nfs_fscache_wait_on_invalidate(inode);
f4ce1299 1250
1e8968c5
NV		 1251 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1252 inode->i_sb->s_id,
1253 (unsigned long long)NFS_FILEID(inode));
717d44e8
TM		 1254 return 0;
1255}
1256
1cd9cb05 1257bool nfs_mapping_need_revalidate_inode(struct inode *inode)
b4b1eadf 1258{
61540bf6
TM		 1259 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1260 NFS_STALE(inode);
b4b1eadf
TM		 1261}
1262
0d0def49
AV		 1263int nfs_revalidate_mapping_rcu(struct inode *inode)
1264{
1265 struct nfs_inode *nfsi = NFS_I(inode);
1266 unsigned long *bitlock = &nfsi->flags;
1267 int ret = 0;
1268
1269 if (IS_SWAPFILE(inode))
1270 goto out;
1271 if (nfs_mapping_need_revalidate_inode(inode)) {
1272 ret = -ECHILD;
1273 goto out;
1274 }
1275 spin_lock(&inode->i_lock);
1276 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1277 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1278 ret = -ECHILD;
1279 spin_unlock(&inode->i_lock);
1280out:
1281 return ret;
1282}
1283
717d44e8 1284/**
be527494 1285 * nfs_revalidate_mapping - Revalidate the pagecache
302fad7b
TM		 1286 * @inode: pointer to host inode
1287 * @mapping: pointer to mapping
717d44e8 1288 */
be527494
TM		 1289int nfs_revalidate_mapping(struct inode *inode,
1290 struct address_space *mapping)
717d44e8
TM		 1291{
1292 struct nfs_inode *nfsi = NFS_I(inode);
d529ef83 1293 unsigned long *bitlock = &nfsi->flags;
717d44e8 1294 int ret = 0;
dc59250c 1295
29418aa4
MG		 1296 /* swapfiles are not supposed to be shared. */
1297 if (IS_SWAPFILE(inode))
1298 goto out;
1299
b4b1eadf 1300 if (nfs_mapping_need_revalidate_inode(inode)) {
717d44e8
TM		 1301 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1302 if (ret < 0)
1303 goto out;
7d52e862 1304 }
d529ef83
JL		 1305
1306 /*
1307 * We must clear NFS_INO_INVALID_DATA first to ensure that
1308 * invalidations that come in while we're shooting down the mappings
1309 * are respected. But, that leaves a race window where one revalidator
1310 * can clear the flag, and then another checks it before the mapping
1311 * gets invalidated. Fix that by serializing access to this part of
1312 * the function.
1313 *
1314 * At the same time, we need to allow other tasks to see whether we
1315 * might be in the middle of invalidating the pages, so we only set
1316 * the bit lock here if it looks like we're going to be doing that.
1317 */
1318 for (;;) {
74316201
N		 1319 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1320 nfs_wait_bit_killable, TASK_KILLABLE);
d529ef83
JL		 1321 if (ret)
1322 goto out;
17dfeb91
TM		 1323 spin_lock(&inode->i_lock);
1324 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1325 spin_unlock(&inode->i_lock);
1326 continue;
1327 }
1328 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
d529ef83 1329 break;
d529ef83 1330 spin_unlock(&inode->i_lock);
17dfeb91 1331 goto out;
f4ce1299
TM		 1332 }
1333
17dfeb91 1334 set_bit(NFS_INO_INVALIDATING, bitlock);
4db72b40 1335 smp_wmb();
1c341b77
TM		 1336 nfsi->cache_validity &= ~(NFS_INO_INVALID_DATA|
1337 NFS_INO_DATA_INVAL_DEFER);
17dfeb91
TM		 1338 spin_unlock(&inode->i_lock);
1339 trace_nfs_invalidate_mapping_enter(inode);
be527494 1340 ret = nfs_invalidate_mapping(inode, mapping);
17dfeb91
TM		 1341 trace_nfs_invalidate_mapping_exit(inode, ret);
1342
d529ef83 1343 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
4e857c58 1344 smp_mb__after_atomic();
d529ef83 1345 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
cd9ae2b6 1346out:
44b11874 1347 return ret;
7d52e862
TM		 1348}
1349
ca0daa27 1350static bool nfs_file_has_writers(struct nfs_inode *nfsi)
874f9463 1351{
ca0daa27
TM		 1352 struct inode *inode = &nfsi->vfs_inode;
1353
ca0daa27
TM		 1354 if (!S_ISREG(inode->i_mode))
1355 return false;
1356 if (list_empty(&nfsi->open_files))
1357 return false;
6ba0c4e5 1358 return inode_is_open_for_write(inode);
874f9463
TM		 1359}
1360
651b0e70 1361static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
874f9463 1362{
651b0e70 1363 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
874f9463
TM		 1364}
1365
783b194c 1366static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
a895b4a1 1367{
e86d5a02 1368 struct timespec64 ts;
95582b00 1369
9e6e70f8
TM		 1370 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1371 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
c472c07b 1372 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1eb5d98f 1373 inode_set_iversion_raw(inode, fattr->change_attr);
70ca8852 1374 if (S_ISDIR(inode->i_mode))
6edf9609 1375 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
70ca8852 1376 }
a895b4a1 1377 /* If we have atomic WCC data, we may update some attributes */
e86d5a02 1378 ts = inode->i_ctime;
9e6e70f8
TM		 1379 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1380 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
e86d5a02
TM		 1381 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1382 inode->i_ctime = fattr->ctime;
27dc1cd3 1383 }
9e6e70f8 1384
e86d5a02 1385 ts = inode->i_mtime;
9e6e70f8
TM		 1386 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1387 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
e86d5a02
TM		 1388 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1389 inode->i_mtime = fattr->mtime;
27dc1cd3 1390 if (S_ISDIR(inode->i_mode))
6edf9609 1391 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
a895b4a1 1392 }
9e6e70f8
TM		 1393 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1394 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1395 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
a6b6d5b8 1396 && !nfs_have_writebacks(inode)) {
27dc1cd3 1397 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
27dc1cd3 1398 }
a895b4a1
TM		 1399}
1400
1da177e4 1401/**
33801147 1402 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
302fad7b
TM		 1403 * @inode: pointer to inode
1404 * @fattr: updated attributes
1da177e4
LT		 1405 *
1406 * Verifies the attribute cache. If we have just changed the attributes,
1407 * so that fattr carries weak cache consistency data, then it may
1408 * also update the ctime/mtime/change_attribute.
1409 */
33801147 1410static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1da177e4
LT		 1411{
1412 struct nfs_inode *nfsi = NFS_I(inode);
1413 loff_t cur_size, new_isize;
2a3f5fd4 1414 unsigned long invalid = 0;
e86d5a02 1415 struct timespec64 ts;
dc59250c 1416
4ebe83af 1417 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
01da47bd 1418 return 0;
4ebe83af 1419
eb3d8f42
TM		 1420 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1421 /* Only a mounted-on-fileid? Just exit */
1422 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1423 return 0;
ca62b9c3 1424 /* Has the inode gone and changed behind our back? */
eb3d8f42 1425 } else if (nfsi->fileid != fattr->fileid) {
7e10cc25
TM		 1426 /* Is this perhaps the mounted-on fileid? */
1427 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1428 nfsi->fileid == fattr->mounted_on_fileid)
1429 return 0;
cc89684c 1430 return -ESTALE;
7e10cc25 1431 }
9e6e70f8 1432 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
cc89684c 1433 return -ESTALE;
ca62b9c3 1434
7e10cc25 1435
651b0e70 1436 if (!nfs_file_has_buffered_writers(nfsi)) {
ca0daa27 1437 /* Verify a few of the more important attributes */
c472c07b 1438 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
16e14375
TM		 1439 invalid |= NFS_INO_INVALID_CHANGE
1440 | NFS_INO_REVAL_PAGECACHE;
1da177e4 1441
e86d5a02
TM		 1442 ts = inode->i_mtime;
1443 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
16e14375 1444 invalid |= NFS_INO_INVALID_MTIME;
ca62b9c3 1445
e86d5a02
TM		 1446 ts = inode->i_ctime;
1447 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
16e14375 1448 invalid |= NFS_INO_INVALID_CTIME;
ca0daa27
TM		 1449
1450 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1451 cur_size = i_size_read(inode);
1452 new_isize = nfs_size_to_loff_t(fattr->size);
1453 if (cur_size != new_isize)
16e14375
TM		 1454 invalid |= NFS_INO_INVALID_SIZE
1455 | NFS_INO_REVAL_PAGECACHE;
ca0daa27 1456 }
9e6e70f8 1457 }
1da177e4
LT		 1458
1459 /* Have any file permissions changed? */
9e6e70f8 1460 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
16e14375
TM		 1461 invalid |= NFS_INO_INVALID_ACCESS
1462 | NFS_INO_INVALID_ACL
1463 | NFS_INO_INVALID_OTHER;
9ff593c4 1464 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
16e14375
TM		 1465 invalid |= NFS_INO_INVALID_ACCESS
1466 | NFS_INO_INVALID_ACL
1467 | NFS_INO_INVALID_OTHER;
9ff593c4 1468 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
16e14375
TM		 1469 invalid |= NFS_INO_INVALID_ACCESS
1470 | NFS_INO_INVALID_ACL
1471 | NFS_INO_INVALID_OTHER;
1da177e4
LT		 1472
1473 /* Has the link count changed? */
9e6e70f8 1474 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
16e14375 1475 invalid |= NFS_INO_INVALID_OTHER;
1da177e4 1476
e86d5a02
TM		 1477 ts = inode->i_atime;
1478 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
2a3f5fd4
TM		 1479 invalid |= NFS_INO_INVALID_ATIME;
1480
1481 if (invalid != 0)
4ebe83af 1482 nfs_set_cache_invalid(inode, invalid);
1da177e4 1483
33801147 1484 nfsi->read_cache_jiffies = fattr->time_start;
1da177e4
LT		 1485 return 0;
1486}
1487
ae05f269 1488static atomic_long_t nfs_attr_generation_counter;
4704f0e2
TM		 1489
1490static unsigned long nfs_read_attr_generation_counter(void)
1491{
ae05f269 1492 return atomic_long_read(&nfs_attr_generation_counter);
4704f0e2
TM		 1493}
1494
1495unsigned long nfs_inc_attr_generation_counter(void)
1496{
ae05f269 1497 return atomic_long_inc_return(&nfs_attr_generation_counter);
4704f0e2 1498}
3235b403 1499EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
4704f0e2
TM		 1500
1501void nfs_fattr_init(struct nfs_fattr *fattr)
1502{
1503 fattr->valid = 0;
1504 fattr->time_start = jiffies;
1505 fattr->gencount = nfs_inc_attr_generation_counter();
6926afd1
TM		 1506 fattr->owner_name = NULL;
1507 fattr->group_name = NULL;
4704f0e2 1508}
ddda8e0a 1509EXPORT_SYMBOL_GPL(nfs_fattr_init);
4704f0e2 1510
140e049c
TM		 1511/**
1512 * nfs_fattr_set_barrier
1513 * @fattr: attributes
1514 *
1515 * Used to set a barrier after an attribute was updated. This
1516 * barrier ensures that older attributes from RPC calls that may
1517 * have raced with our update cannot clobber these new values.
1518 * Note that you are still responsible for ensuring that other
1519 * operations which change the attribute on the server do not
1520 * collide.
1521 */
1522void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1523{
1524 fattr->gencount = nfs_inc_attr_generation_counter();
1525}
1526
2d36bfde
TM		 1527struct nfs_fattr *nfs_alloc_fattr(void)
1528{
1529 struct nfs_fattr *fattr;
1530
1531 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1532 if (fattr != NULL)
1533 nfs_fattr_init(fattr);
1534 return fattr;
1535}
ddda8e0a 1536EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
2d36bfde
TM		 1537
1538struct nfs_fh *nfs_alloc_fhandle(void)
1539{
1540 struct nfs_fh *fh;
1541
1542 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1543 if (fh != NULL)
1544 fh->size = 0;
1545 return fh;
1546}
ddda8e0a 1547EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
2d36bfde 1548
e27d359e 1549#ifdef NFS_DEBUG
d8e0539e
WAA		 1550/*
1551 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1552 * in the same way that wireshark does
1553 *
1554 * @fh: file handle
1555 *
1556 * For debugging only.
1557 */
1558u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1559{
1560 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1561 * not on the result */
1264a2f0 1562 return nfs_fhandle_hash(fh);
d8e0539e 1563}
9e6ee76d 1564EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
d8e0539e
WAA		 1565
1566/*
20d27e92
CL		 1567 * _nfs_display_fhandle - display an NFS file handle on the console
1568 *
1569 * @fh: file handle to display
1570 * @caption: display caption
1571 *
1572 * For debugging only.
1573 */
20d27e92
CL		 1574void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1575{
1576 unsigned short i;
1577
fa68a1ba 1578 if (fh == NULL || fh->size == 0) {
20d27e92
CL		 1579 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1580 return;
1581 }
1582
d8e0539e
WAA		 1583 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1584 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
20d27e92
CL		 1585 for (i = 0; i < fh->size; i += 16) {
1586 __be32 *pos = (__be32 *)&fh->data[i];
1587
1588 switch ((fh->size - i - 1) >> 2) {
1589 case 0:
1590 printk(KERN_DEFAULT " %08x\n",
1591 be32_to_cpup(pos));
1592 break;
1593 case 1:
1594 printk(KERN_DEFAULT " %08x %08x\n",
1595 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1596 break;
1597 case 2:
1598 printk(KERN_DEFAULT " %08x %08x %08x\n",
1599 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1600 be32_to_cpup(pos + 2));
1601 break;
1602 default:
1603 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1604 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1605 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1606 }
1607 }
1608}
9e6ee76d 1609EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
20d27e92
CL		 1610#endif
1611
a10ad176
TM		 1612/**
1613 * nfs_inode_attrs_need_update - check if the inode attributes need updating
302fad7b
TM		 1614 * @inode: pointer to inode
1615 * @fattr: attributes
a10ad176
TM		 1616 *
1617 * Attempt to divine whether or not an RPC call reply carrying stale
1618 * attributes got scheduled after another call carrying updated ones.
1619 *
1620 * To do so, the function first assumes that a more recent ctime means
1621 * that the attributes in fattr are newer, however it also attempt to
1622 * catch the case where ctime either didn't change, or went backwards
1623 * (if someone reset the clock on the server) by looking at whether
1624 * or not this RPC call was started after the inode was last updated.
4704f0e2 1625 * Note also the check for wraparound of 'attr_gencount'
a10ad176
TM		 1626 *
1627 * The function returns 'true' if it thinks the attributes in 'fattr' are
1628 * more recent than the ones cached in the inode.
1629 *
1630 */
1631static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1632{
1633 const struct nfs_inode *nfsi = NFS_I(inode);
1634
4704f0e2 1635 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
4704f0e2 1636 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
a10ad176
TM		 1637}
1638
1639static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1640{
f4ce1299
TM		 1641 int ret;
1642
1643 trace_nfs_refresh_inode_enter(inode);
1644
a10ad176 1645 if (nfs_inode_attrs_need_update(inode, fattr))
f4ce1299
TM		 1646 ret = nfs_update_inode(inode, fattr);
1647 else
1648 ret = nfs_check_inode_attributes(inode, fattr);
1649
1650 trace_nfs_refresh_inode_exit(inode, ret);
1651 return ret;
870a5be8
TM		 1652}
1653
33801147
TM		 1654/**
1655 * nfs_refresh_inode - try to update the inode attribute cache
302fad7b
TM		 1656 * @inode: pointer to inode
1657 * @fattr: updated attributes
33801147
TM		 1658 *
1659 * Check that an RPC call that returned attributes has not overlapped with
1660 * other recent updates of the inode metadata, then decide whether it is
1661 * safe to do a full update of the inode attributes, or whether just to
1662 * call nfs_check_inode_attributes.
1663 */
1664int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1665{
33801147
TM		 1666 int status;
1667
1668 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1669 return 0;
1670 spin_lock(&inode->i_lock);
870a5be8 1671 status = nfs_refresh_inode_locked(inode, fattr);
33801147 1672 spin_unlock(&inode->i_lock);
ef79c097 1673
33801147
TM		 1674 return status;
1675}
ddda8e0a 1676EXPORT_SYMBOL_GPL(nfs_refresh_inode);
33801147 1677
16e14375
TM		 1678static int nfs_post_op_update_inode_locked(struct inode *inode,
1679 struct nfs_fattr *fattr, unsigned int invalid)
d65f557f 1680{
6edf9609
TM		 1681 if (S_ISDIR(inode->i_mode))
1682 invalid |= NFS_INO_INVALID_DATA;
1683 nfs_set_cache_invalid(inode, invalid);
d65f557f
TM		 1684 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1685 return 0;
1686 return nfs_refresh_inode_locked(inode, fattr);
1687}
1688
decf491f
TM		 1689/**
1690 * nfs_post_op_update_inode - try to update the inode attribute cache
302fad7b
TM		 1691 * @inode: pointer to inode
1692 * @fattr: updated attributes
decf491f
TM		 1693 *
1694 * After an operation that has changed the inode metadata, mark the
1695 * attribute cache as being invalid, then try to update it.
f551e44f
CL		 1696 *
1697 * NB: if the server didn't return any post op attributes, this
1698 * function will force the retrieval of attributes before the next
1699 * NFS request. Thus it should be used only for operations that
1700 * are expected to change one or more attributes, to avoid
1701 * unnecessary NFS requests and trips through nfs_update_inode().
decf491f
TM		 1702 */
1703int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1704{
d65f557f 1705 int status;
decf491f 1706
7668fdbe 1707 spin_lock(&inode->i_lock);
92d64e47 1708 nfs_fattr_set_barrier(fattr);
16e14375
TM		 1709 status = nfs_post_op_update_inode_locked(inode, fattr,
1710 NFS_INO_INVALID_CHANGE
d554168f
TM		 1711 | NFS_INO_INVALID_CTIME
1712 | NFS_INO_REVAL_FORCED);
7668fdbe 1713 spin_unlock(&inode->i_lock);
aa9c2669 1714
870a5be8 1715 return status;
decf491f 1716}
1c606fb7 1717EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
decf491f 1718
70ca8852 1719/**
a08a8cd3 1720 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
302fad7b
TM		 1721 * @inode: pointer to inode
1722 * @fattr: updated attributes
70ca8852
TM		 1723 *
1724 * After an operation that has changed the inode metadata, mark the
1725 * attribute cache as being invalid, then try to update it. Fake up
1726 * weak cache consistency data, if none exist.
1727 *
1728 * This function is mainly designed to be used by the ->write_done() functions.
1729 */
a08a8cd3 1730int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
70ca8852 1731{
d65f557f
TM		 1732 int status;
1733
d65f557f
TM		 1734 /* Don't do a WCC update if these attributes are already stale */
1735 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1736 !nfs_inode_attrs_need_update(inode, fattr)) {
9e6e70f8
TM		 1737 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1738 | NFS_ATTR_FATTR_PRESIZE
1739 | NFS_ATTR_FATTR_PREMTIME
1740 | NFS_ATTR_FATTR_PRECTIME);
d65f557f
TM		 1741 goto out_noforce;
1742 }
9e6e70f8
TM		 1743 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1744 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1eb5d98f 1745 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
9e6e70f8 1746 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
70ca8852 1747 }
9e6e70f8
TM		 1748 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1749 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
e86d5a02 1750 fattr->pre_ctime = inode->i_ctime;
9e6e70f8
TM		 1751 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1752 }
1753 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1754 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
e86d5a02 1755 fattr->pre_mtime = inode->i_mtime;
9e6e70f8
TM		 1756 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1757 }
1758 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1759 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
a3d01454 1760 fattr->pre_size = i_size_read(inode);
9e6e70f8 1761 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
70ca8852 1762 }
d65f557f 1763out_noforce:
16e14375
TM		 1764 status = nfs_post_op_update_inode_locked(inode, fattr,
1765 NFS_INO_INVALID_CHANGE
1766 | NFS_INO_INVALID_CTIME
1767 | NFS_INO_INVALID_MTIME);
a08a8cd3
TM		 1768 return status;
1769}
1770
1771/**
1772 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
302fad7b
TM		 1773 * @inode: pointer to inode
1774 * @fattr: updated attributes
a08a8cd3
TM		 1775 *
1776 * After an operation that has changed the inode metadata, mark the
1777 * attribute cache as being invalid, then try to update it. Fake up
1778 * weak cache consistency data, if none exist.
1779 *
1780 * This function is mainly designed to be used by the ->write_done() functions.
1781 */
1782int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1783{
1784 int status;
1785
1786 spin_lock(&inode->i_lock);
8f8ba1d7 1787 nfs_fattr_set_barrier(fattr);
a08a8cd3 1788 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
d65f557f
TM		 1789 spin_unlock(&inode->i_lock);
1790 return status;
70ca8852 1791}
ddda8e0a 1792EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
70ca8852 1793
ea96d1ec 1794
1da177e4
LT		 1795/*
1796 * Many nfs protocol calls return the new file attributes after
1797 * an operation. Here we update the inode to reflect the state
1798 * of the server's inode.
1799 *
1800 * This is a bit tricky because we have to make sure all dirty pages
1801 * have been sent off to the server before calling invalidate_inode_pages.
1802 * To make sure no other process adds more write requests while we try
1803 * our best to flush them, we make them sleep during the attribute refresh.
1804 *
1805 * A very similar scenario holds for the dir cache.
1806 */
24aa1fe6 1807static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1da177e4 1808{
8b4bdcf8 1809 struct nfs_server *server;
1da177e4 1810 struct nfs_inode *nfsi = NFS_I(inode);
951a143b 1811 loff_t cur_isize, new_isize;
2a3f5fd4 1812 unsigned long invalid = 0;
3e7d950a 1813 unsigned long now = jiffies;
62ab460c 1814 unsigned long save_cache_validity;
651b0e70 1815 bool have_writers = nfs_file_has_buffered_writers(nfsi);
944171cb 1816 bool cache_revalidated = true;
0b467264 1817 bool attr_changed = false;
c80d17c5 1818 bool have_delegation;
1da177e4 1819
1e8968c5 1820 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
3110ff80 1821 __func__, inode->i_sb->s_id, inode->i_ino,
4f1abd22 1822 nfs_display_fhandle_hash(NFS_FH(inode)),
1da177e4
LT		 1823 atomic_read(&inode->i_count), fattr->valid);
1824
eb3d8f42
TM		 1825 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1826 /* Only a mounted-on-fileid? Just exit */
1827 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1828 return 0;
7e10cc25 1829 /* Has the inode gone and changed behind our back? */
eb3d8f42 1830 } else if (nfsi->fileid != fattr->fileid) {
7e10cc25
TM		 1831 /* Is this perhaps the mounted-on fileid? */
1832 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1833 nfsi->fileid == fattr->mounted_on_fileid)
1834 return 0;
e73e6c9e
MT		 1835 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1836 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1837 NFS_SERVER(inode)->nfs_client->cl_hostname,
1838 inode->i_sb->s_id, (long long)nfsi->fileid,
1839 (long long)fattr->fileid);
1840 goto out_err;
1841 }
1da177e4
LT		 1842
1843 /*
1844 * Make sure the inode's type hasn't changed.
1845 */
e73e6c9e
MT		 1846 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1847 /*
1848 * Big trouble! The inode has become a different object.
1849 */
1e8968c5 1850 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
e73e6c9e
MT		 1851 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1852 goto out_err;
1853 }
1da177e4 1854
8b4bdcf8 1855 server = NFS_SERVER(inode);
a0356862 1856 /* Update the fsid? */
9e6e70f8 1857 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
c37dcd33 1858 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
36d43a43 1859 !IS_AUTOMOUNT(inode))
8b4bdcf8
TM		 1860 server->fsid = fattr->fsid;
1861
c80d17c5
TM		 1862 /* Save the delegation state before clearing cache_validity */
1863 have_delegation = nfs_have_delegated_attributes(inode);
1864
1da177e4
LT		 1865 /*
1866 * Update the read time so we don't revalidate too often.
1867 */
33801147 1868 nfsi->read_cache_jiffies = fattr->time_start;
3e7d950a 1869
62ab460c
TM		 1870 save_cache_validity = nfsi->cache_validity;
1871 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1872 | NFS_INO_INVALID_ATIME
1873 | NFS_INO_REVAL_FORCED
1874 | NFS_INO_REVAL_PAGECACHE);
1da177e4 1875
a895b4a1 1876 /* Do atomic weak cache consistency updates */
783b194c 1877 nfs_wcc_update_inode(inode, fattr);
a895b4a1 1878
944171cb
BC		 1879 if (pnfs_layoutcommit_outstanding(inode)) {
1880 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1881 cache_revalidated = false;
1882 }
10b7e9ad 1883
47aabaa7 1884 /* More cache consistency checks */
9e6e70f8 1885 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
c472c07b 1886 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
38512aa9 1887 /* Could it be a race with writeback? */
c80d17c5 1888 if (!(have_writers || have_delegation)) {
0b467264 1889 invalid |= NFS_INO_INVALID_DATA
38512aa9
TM		 1890 | NFS_INO_INVALID_ACCESS
1891 | NFS_INO_INVALID_ACL;
cac88f94 1892 /* Force revalidate of all attributes */
16e14375
TM		 1893 save_cache_validity |= NFS_INO_INVALID_CTIME
1894 | NFS_INO_INVALID_MTIME
1895 | NFS_INO_INVALID_SIZE
1896 | NFS_INO_INVALID_OTHER;
38512aa9
TM		 1897 if (S_ISDIR(inode->i_mode))
1898 nfs_force_lookup_revalidate(inode);
c80d17c5
TM		 1899 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1900 inode->i_sb->s_id,
1901 inode->i_ino);
1c341b77
TM		 1902 } else if (!have_delegation)
1903 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1eb5d98f 1904 inode_set_iversion_raw(inode, fattr->change_attr);
0b467264 1905 attr_changed = true;
9e6e70f8 1906 }
ade14a7d 1907 } else {
8619ddd0 1908 nfsi->cache_validity |= save_cache_validity &
16e14375 1909 (NFS_INO_INVALID_CHANGE
8619ddd0
TM		 1910 | NFS_INO_REVAL_PAGECACHE
1911 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1912 cache_revalidated = false;
1913 }
9e6e70f8
TM		 1914
1915 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
e86d5a02 1916 inode->i_mtime = fattr->mtime;
ade14a7d 1917 } else if (server->caps & NFS_CAP_MTIME) {
43b6535e 1918 nfsi->cache_validity |= save_cache_validity &
16e14375 1919 (NFS_INO_INVALID_MTIME
62ab460c 1920 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1921 cache_revalidated = false;
1922 }
62ab460c 1923
9e6e70f8 1924 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
e86d5a02 1925 inode->i_ctime = fattr->ctime;
ade14a7d 1926 } else if (server->caps & NFS_CAP_CTIME) {
43b6535e 1927 nfsi->cache_validity |= save_cache_validity &
16e14375 1928 (NFS_INO_INVALID_CTIME
62ab460c 1929 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1930 cache_revalidated = false;
1931 }
47aabaa7 1932
951a143b 1933 /* Check if our cached file size is stale */
9e6e70f8
TM		 1934 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1935 new_isize = nfs_size_to_loff_t(fattr->size);
1936 cur_isize = i_size_read(inode);
c80d17c5 1937 if (new_isize != cur_isize && !have_delegation) {
9e6e70f8
TM		 1938 /* Do we perhaps have any outstanding writes, or has
1939 * the file grown beyond our last write? */
a6b6d5b8 1940 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
9e6e70f8 1941 i_size_write(inode, new_isize);
ca0daa27 1942 if (!have_writers)
16e14375 1943 invalid |= NFS_INO_INVALID_DATA;
0b467264 1944 attr_changed = true;
9e6e70f8 1945 }
60c16ea8
HJ		 1946 dprintk("NFS: isize change on server for file %s/%ld "
1947 "(%Ld to %Ld)\n",
1948 inode->i_sb->s_id,
1949 inode->i_ino,
1950 (long long)cur_isize,
1951 (long long)new_isize);
1da177e4 1952 }
ade14a7d 1953 } else {
43b6535e 1954 nfsi->cache_validity |= save_cache_validity &
16e14375 1955 (NFS_INO_INVALID_SIZE
62ab460c
TM		 1956 | NFS_INO_REVAL_PAGECACHE
1957 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1958 cache_revalidated = false;
1959 }
1da177e4 1960
1da177e4 1961
9e6e70f8 1962 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
e86d5a02 1963 inode->i_atime = fattr->atime;
ade14a7d 1964 else if (server->caps & NFS_CAP_ATIME) {
43b6535e
TM		 1965 nfsi->cache_validity |= save_cache_validity &
1966 (NFS_INO_INVALID_ATIME
62ab460c 1967 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1968 cache_revalidated = false;
1969 }
1da177e4 1970
9e6e70f8
TM		 1971 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1972 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
9b4b3513
TM		 1973 umode_t newmode = inode->i_mode & S_IFMT;
1974 newmode |= fattr->mode & S_IALLUGO;
1975 inode->i_mode = newmode;
16e14375 1976 invalid |= NFS_INO_INVALID_ACCESS
0b467264
TM		 1977 | NFS_INO_INVALID_ACL;
1978 attr_changed = true;
9e6e70f8 1979 }
ade14a7d 1980 } else if (server->caps & NFS_CAP_MODE) {
43b6535e 1981 nfsi->cache_validity |= save_cache_validity &
0b467264 1982 (NFS_INO_INVALID_OTHER
62ab460c 1983 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1984 cache_revalidated = false;
1985 }
62ab460c 1986
9e6e70f8 1987 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
9ff593c4 1988 if (!uid_eq(inode->i_uid, fattr->uid)) {
16e14375 1989 invalid |= NFS_INO_INVALID_ACCESS
0b467264 1990 | NFS_INO_INVALID_ACL;
9e6e70f8 1991 inode->i_uid = fattr->uid;
0b467264 1992 attr_changed = true;
9e6e70f8 1993 }
ade14a7d 1994 } else if (server->caps & NFS_CAP_OWNER) {
43b6535e 1995 nfsi->cache_validity |= save_cache_validity &
0b467264 1996 (NFS_INO_INVALID_OTHER
62ab460c 1997 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1998 cache_revalidated = false;
1999 }
62ab460c 2000
9e6e70f8 2001 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
9ff593c4 2002 if (!gid_eq(inode->i_gid, fattr->gid)) {
16e14375 2003 invalid |= NFS_INO_INVALID_ACCESS
0b467264 2004 | NFS_INO_INVALID_ACL;
9e6e70f8 2005 inode->i_gid = fattr->gid;
0b467264 2006 attr_changed = true;
9e6e70f8 2007 }
ade14a7d 2008 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
43b6535e 2009 nfsi->cache_validity |= save_cache_validity &
0b467264 2010 (NFS_INO_INVALID_OTHER
62ab460c 2011 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2012 cache_revalidated = false;
2013 }
921615f1 2014
9e6e70f8
TM		 2015 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2016 if (inode->i_nlink != fattr->nlink) {
9e6e70f8
TM		 2017 if (S_ISDIR(inode->i_mode))
2018 invalid |= NFS_INO_INVALID_DATA;
bfe86848 2019 set_nlink(inode, fattr->nlink);
0b467264 2020 attr_changed = true;
9e6e70f8 2021 }
ade14a7d 2022 } else if (server->caps & NFS_CAP_NLINK) {
43b6535e 2023 nfsi->cache_validity |= save_cache_validity &
16e14375 2024 (NFS_INO_INVALID_OTHER
62ab460c 2025 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2026 cache_revalidated = false;
2027 }
1da177e4 2028
9e6e70f8 2029 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 2030 /*
2031 * report the blocks in 512byte units
2032 */
2033 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
ade14a7d 2034 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
9e6e70f8 2035 inode->i_blocks = fattr->du.nfs2.blocks;
ade14a7d
TM		 2036 else
2037 cache_revalidated = false;
1da177e4
LT		 2038
2039 /* Update attrtimeo value if we're out of the unstable period */
0b467264 2040 if (attr_changed) {
cac88f94 2041 invalid &= ~NFS_INO_INVALID_ATTR;
91d5b470 2042 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1da177e4 2043 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
3e7d950a 2044 nfsi->attrtimeo_timestamp = now;
f5062003 2045 /* Set barrier to be more recent than all outstanding updates */
4704f0e2 2046 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
6d2b2966 2047 } else {
ade14a7d
TM		 2048 if (cache_revalidated) {
2049 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2050 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2051 nfsi->attrtimeo <<= 1;
2052 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2053 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2054 }
6d2b2966
TM		 2055 nfsi->attrtimeo_timestamp = now;
2056 }
f5062003
TM		 2057 /* Set the barrier to be more recent than this fattr */
2058 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
2059 nfsi->attr_gencount = fattr->gencount;
1da177e4 2060 }
c812012f 2061
1da177e4
LT		 2062 /* Don't invalidate the data if we were to blame */
2063 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2064 || S_ISLNK(inode->i_mode)))
2065 invalid &= ~NFS_INO_INVALID_DATA;
c80d17c5 2066 nfs_set_cache_invalid(inode, invalid);
de242c0b 2067
1da177e4 2068 return 0;
b37b03b7 2069 out_err:
1da177e4
LT		 2070 /*
2071 * No need to worry about unhashing the dentry, as the
2072 * lookup validation will know that the inode is bad.
2073 * (But we fall through to invalidate the caches.)
2074 */
93ce4af7 2075 nfs_set_inode_stale_locked(inode);
1da177e4
LT		 2076 return -ESTALE;
2077}
2078
f7b422b1 2079struct inode *nfs_alloc_inode(struct super_block *sb)
1da177e4
LT		 2080{
2081 struct nfs_inode *nfsi;
c456aacf 2082 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1da177e4
LT		 2083 if (!nfsi)
2084 return NULL;
55296809
CL		 2085 nfsi->flags = 0UL;
2086 nfsi->cache_validity = 0UL;
89d77c8f 2087#if IS_ENABLED(CONFIG_NFS_V4)
e50a1c2e
BF		 2088 nfsi->nfs4_acl = NULL;
2089#endif /* CONFIG_NFS_V4 */
1da177e4
LT		 2090 return &nfsi->vfs_inode;
2091}
89d77c8f 2092EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1da177e4 2093
ca1a199e 2094void nfs_free_inode(struct inode *inode)
1da177e4
LT		 2095{
2096 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2097}
ca1a199e 2098EXPORT_SYMBOL_GPL(nfs_free_inode);
fa0d7e3d 2099
d75d5414
AM		 2100static inline void nfs4_init_once(struct nfs_inode *nfsi)
2101{
89d77c8f 2102#if IS_ENABLED(CONFIG_NFS_V4)
d75d5414
AM		 2103 INIT_LIST_HEAD(&nfsi->open_states);
2104 nfsi->delegation = NULL;
d75d5414 2105 init_rwsem(&nfsi->rwsem);
e5e94017 2106 nfsi->layout = NULL;
d75d5414
AM		 2107#endif
2108}
f7b422b1 2109
51cc5068 2110static void init_once(void *foo)
1da177e4
LT		 2111{
2112 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2113
a35afb83 2114 inode_init_once(&nfsi->vfs_inode);
a35afb83
CL		 2115 INIT_LIST_HEAD(&nfsi->open_files);
2116 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2117 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
ea2cf228 2118 INIT_LIST_HEAD(&nfsi->commit_info.list);
a6b6d5b8 2119 atomic_long_set(&nfsi->nrequests, 0);
5cb953d4 2120 atomic_long_set(&nfsi->commit_info.ncommit, 0);
1a0de48a 2121 atomic_set(&nfsi->commit_info.rpcs_out, 0);
884be175 2122 init_rwsem(&nfsi->rmdir_sem);
e824f99a 2123 mutex_init(&nfsi->commit_mutex);
a35afb83 2124 nfs4_init_once(nfsi);
efeda80d 2125 nfsi->cache_change_attribute = 0;
1da177e4 2126}
20c2df83 2127
f7b422b1 2128static int __init nfs_init_inodecache(void)
1da177e4
LT		 2129{
2130 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2131 sizeof(struct nfs_inode),
fffb60f9 2132 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 2133 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 2134 init_once);
1da177e4
LT		 2135 if (nfs_inode_cachep == NULL)
2136 return -ENOMEM;
2137
2138 return 0;
2139}
2140
266bee88 2141static void nfs_destroy_inodecache(void)
1da177e4 2142{
8c0a8537
KS		 2143 /*
2144 * Make sure all delayed rcu free inodes are flushed before we
2145 * destroy cache.
2146 */
2147 rcu_barrier();
1a1d92c1 2148 kmem_cache_destroy(nfs_inode_cachep);
1da177e4
LT		 2149}
2150
5746006f 2151struct workqueue_struct *nfsiod_workqueue;
89d77c8f 2152EXPORT_SYMBOL_GPL(nfsiod_workqueue);
5746006f
TM		 2153
2154/*
2155 * start up the nfsiod workqueue
2156 */
2157static int nfsiod_start(void)
2158{
2159 struct workqueue_struct *wq;
2160 dprintk("RPC: creating workqueue nfsiod\n");
ada609ee 2161 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
5746006f
TM		 2162 if (wq == NULL)
2163 return -ENOMEM;
2164 nfsiod_workqueue = wq;
2165 return 0;
2166}
2167
2168/*
2169 * Destroy the nfsiod workqueue
2170 */
2171static void nfsiod_stop(void)
2172{
2173 struct workqueue_struct *wq;
2174
2175 wq = nfsiod_workqueue;
2176 if (wq == NULL)
2177 return;
2178 nfsiod_workqueue = NULL;
2179 destroy_workqueue(wq);
2180}
2181
c7d03a00 2182unsigned int nfs_net_id;
9e2e74db 2183EXPORT_SYMBOL_GPL(nfs_net_id);
1b340d01
SK		 2184
2185static int nfs_net_init(struct net *net)
2186{
6b13168b 2187 nfs_clients_init(net);
65b38851 2188 return nfs_fs_proc_net_init(net);
1b340d01
SK		 2189}
2190
2191static void nfs_net_exit(struct net *net)
2192{
65b38851 2193 nfs_fs_proc_net_exit(net);
10b7a70c 2194 nfs_clients_exit(net);
1b340d01
SK		 2195}
2196
2197static struct pernet_operations nfs_net_ops = {
2198 .init = nfs_net_init,
2199 .exit = nfs_net_exit,
2200 .id = &nfs_net_id,
2201 .size = sizeof(struct nfs_net),
2202};
2203
1da177e4
LT		 2204/*
2205 * Initialize NFS
2206 */
2207static int __init init_nfs_fs(void)
2208{
2209 int err;
2210
996bc4f4
TM		 2211 err = nfs_sysfs_init();
2212 if (err < 0)
2213 goto out10;
2214
1b340d01 2215 err = register_pernet_subsys(&nfs_net_ops);
e571cbf1 2216 if (err < 0)
89d77c8f 2217 goto out9;
e571cbf1 2218
8ec442ae
DH		 2219 err = nfs_fscache_register();
2220 if (err < 0)
89d77c8f 2221 goto out8;
8ec442ae 2222
5746006f
TM		 2223 err = nfsiod_start();
2224 if (err)
89d77c8f 2225 goto out7;
5746006f 2226
6aaca566
DH		 2227 err = nfs_fs_proc_init();
2228 if (err)
89d77c8f 2229 goto out6;
6aaca566 2230
1da177e4
LT		 2231 err = nfs_init_nfspagecache();
2232 if (err)
89d77c8f 2233 goto out5;
1da177e4
LT		 2234
2235 err = nfs_init_inodecache();
2236 if (err)
89d77c8f 2237 goto out4;
1da177e4
LT		 2238
2239 err = nfs_init_readpagecache();
2240 if (err)
89d77c8f 2241 goto out3;
1da177e4
LT		 2242
2243 err = nfs_init_writepagecache();
2244 if (err)
89d77c8f 2245 goto out2;
1da177e4 2246
1da177e4
LT		 2247 err = nfs_init_directcache();
2248 if (err)
89d77c8f 2249 goto out1;
1da177e4 2250
ec7652aa 2251 rpc_proc_register(&init_net, &nfs_rpcstat);
cd738ee9
KM		 2252
2253 err = register_nfs_fs();
2254 if (err)
129d1977
BS		 2255 goto out0;
2256
1da177e4 2257 return 0;
129d1977 2258out0:
ec7652aa 2259 rpc_proc_unregister(&init_net, "nfs");
1da177e4 2260 nfs_destroy_directcache();
89d77c8f 2261out1:
129d1977 2262 nfs_destroy_writepagecache();
89d77c8f 2263out2:
129d1977 2264 nfs_destroy_readpagecache();
89d77c8f 2265out3:
129d1977 2266 nfs_destroy_inodecache();
89d77c8f 2267out4:
129d1977 2268 nfs_destroy_nfspagecache();
89d77c8f 2269out5:
129d1977 2270 nfs_fs_proc_exit();
89d77c8f 2271out6:
129d1977 2272 nfsiod_stop();
89d77c8f 2273out7:
129d1977 2274 nfs_fscache_unregister();
89d77c8f 2275out8:
129d1977 2276 unregister_pernet_subsys(&nfs_net_ops);
89d77c8f 2277out9:
996bc4f4
TM		 2278 nfs_sysfs_exit();
2279out10:
1da177e4
LT		 2280 return err;
2281}
2282
2283static void __exit exit_nfs_fs(void)
2284{
1da177e4 2285 nfs_destroy_directcache();
1da177e4
LT		 2286 nfs_destroy_writepagecache();
2287 nfs_destroy_readpagecache();
2288 nfs_destroy_inodecache();
2289 nfs_destroy_nfspagecache();
8ec442ae 2290 nfs_fscache_unregister();
1b340d01 2291 unregister_pernet_subsys(&nfs_net_ops);
ec7652aa 2292 rpc_proc_unregister(&init_net, "nfs");
f7b422b1 2293 unregister_nfs_fs();
6aaca566 2294 nfs_fs_proc_exit();
5746006f 2295 nfsiod_stop();
996bc4f4 2296 nfs_sysfs_exit();
1da177e4
LT		 2297}
2298
2299/* Not quite true; I just maintain it */
2300MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2301MODULE_LICENSE("GPL");
f43bf0be 2302module_param(enable_ino64, bool, 0644);
1da177e4
LT		 2303
2304module_init(init_nfs_fs)
2305module_exit(exit_nfs_fs)
Linux 6.x block layer and io_uring tree(s)