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