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NFS: Don't redirty the attribute cache in nfs_wcc_update_inode()
[linux-2.6-block.git] / fs / nfs / inode.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/nfs/inode.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs inode and superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
1da177e4
LT		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 */
15
1da177e4
LT		 16#include <linux/module.h>
17#include <linux/init.h>
174cd4b1 18#include <linux/sched/signal.h>
1da177e4
LT		 19#include <linux/time.h>
20#include <linux/kernel.h>
21#include <linux/mm.h>
22#include <linux/string.h>
23#include <linux/stat.h>
24#include <linux/errno.h>
25#include <linux/unistd.h>
26#include <linux/sunrpc/clnt.h>
27#include <linux/sunrpc/stats.h>
4ece3a2d 28#include <linux/sunrpc/metrics.h>
1da177e4
LT		 29#include <linux/nfs_fs.h>
30#include <linux/nfs_mount.h>
31#include <linux/nfs4_mount.h>
32#include <linux/lockd/bind.h>
1da177e4
LT		 33#include <linux/seq_file.h>
34#include <linux/mount.h>
1da177e4 35#include <linux/vfs.h>
9cdb3883
MN		 36#include <linux/inet.h>
37#include <linux/nfs_xdr.h>
5a0e3ad6 38#include <linux/slab.h>
3fa0b4e2 39#include <linux/compat.h>
d310310c 40#include <linux/freezer.h>
7c0f6ba6 41#include <linux/uaccess.h>
1eb5d98f 42#include <linux/iversion.h>
1da177e4 43
4ce79717 44#include "nfs4_fs.h"
a72b4422 45#include "callback.h"
1da177e4 46#include "delegation.h"
d9ef5a8c 47#include "iostat.h"
f7b422b1 48#include "internal.h"
8ec442ae 49#include "fscache.h"
e5e94017 50#include "pnfs.h"
ab7017a3 51#include "nfs.h"
1b340d01 52#include "netns.h"
1da177e4 53
f4ce1299
TM		 54#include "nfstrace.h"
55
1da177e4 56#define NFSDBG_FACILITY NFSDBG_VFS
1da177e4 57
f43bf0be
TM		 58#define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
59
60/* Default is to see 64-bit inode numbers */
90ab5ee9 61static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
f43bf0be 62
1da177e4 63static void nfs_invalidate_inode(struct inode *);
24aa1fe6 64static int nfs_update_inode(struct inode *, struct nfs_fattr *);
1da177e4 65
e18b890b 66static struct kmem_cache * nfs_inode_cachep;
b7fa0554 67
1da177e4
LT		 68static inline unsigned long
69nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
70{
71 return nfs_fileid_to_ino_t(fattr->fileid);
72}
73
210c7c17 74static int nfs_wait_killable(int mode)
72cb77f4 75{
416ad3c9 76 freezable_schedule_unsafe();
dfd01f02
PZ		 77 if (signal_pending_state(mode, current))
78 return -ERESTARTSYS;
72cb77f4
TM		 79 return 0;
80}
210c7c17
BC		 81
82int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
83{
84 return nfs_wait_killable(mode);
85}
89d77c8f 86EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
72cb77f4 87
5e4def20 88int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode)
210c7c17 89{
5e4def20 90 return nfs_wait_killable(mode);
210c7c17
BC		 91}
92
f43bf0be
TM		 93/**
94 * nfs_compat_user_ino64 - returns the user-visible inode number
95 * @fileid: 64-bit fileid
96 *
97 * This function returns a 32-bit inode number if the boot parameter
98 * nfs.enable_ino64 is zero.
99 */
100u64 nfs_compat_user_ino64(u64 fileid)
101{
3fa0b4e2
FF		 102#ifdef CONFIG_COMPAT
103 compat_ulong_t ino;
104#else
105 unsigned long ino;
106#endif
f43bf0be
TM		 107
108 if (enable_ino64)
109 return fileid;
110 ino = fileid;
111 if (sizeof(ino) < sizeof(fileid))
112 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
113 return ino;
114}
115
eed99357
TM		 116int nfs_drop_inode(struct inode *inode)
117{
118 return NFS_STALE(inode) || generic_drop_inode(inode);
119}
120EXPORT_SYMBOL_GPL(nfs_drop_inode);
121
19d87ca3 122void nfs_clear_inode(struct inode *inode)
1da177e4 123{
da6d503a
TM		 124 /*
125 * The following should never happen...
126 */
f48407dd
TM		 127 WARN_ON_ONCE(nfs_have_writebacks(inode));
128 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
ada70d94 129 nfs_zap_acl_cache(inode);
1c3c07e9 130 nfs_access_zap_cache(inode);
f1fe29b4 131 nfs_fscache_clear_inode(inode);
1da177e4 132}
89d77c8f 133EXPORT_SYMBOL_GPL(nfs_clear_inode);
1da177e4 134
b57922d9
AV		 135void nfs_evict_inode(struct inode *inode)
136{
91b0abe3 137 truncate_inode_pages_final(&inode->i_data);
dbd5768f 138 clear_inode(inode);
b57922d9
AV		 139 nfs_clear_inode(inode);
140}
141
9e1681c2 142int nfs_sync_inode(struct inode *inode)
4d346bea 143{
95d9f6c3 144 inode_dio_wait(inode);
4d346bea
TM		 145 return nfs_wb_all(inode);
146}
9e1681c2 147EXPORT_SYMBOL_GPL(nfs_sync_inode);
4d346bea 148
29884df0
TM		 149/**
150 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
151 */
152int nfs_sync_mapping(struct address_space *mapping)
153{
5cf95214 154 int ret = 0;
29884df0 155
5cf95214
TM		 156 if (mapping->nrpages != 0) {
157 unmap_mapping_range(mapping, 0, 0, 0);
158 ret = nfs_wb_all(mapping->host);
159 }
29884df0
TM		 160 return ret;
161}
162
187e593d
TM		 163static int nfs_attribute_timeout(struct inode *inode)
164{
165 struct nfs_inode *nfsi = NFS_I(inode);
166
167 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
168}
169
61540bf6
TM		 170static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
171{
172 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
173
174 /* Special case for the pagecache or access cache */
175 if (flags == NFS_INO_REVAL_PAGECACHE &&
176 !(cache_validity & NFS_INO_REVAL_FORCED))
177 return false;
178 return (cache_validity & flags) != 0;
179}
180
181static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
182{
183 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
184
185 if ((cache_validity & flags) != 0)
186 return true;
187 if (nfs_attribute_timeout(inode))
188 return true;
189 return false;
190}
191
192bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
193{
194 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
195 return nfs_check_cache_invalid_delegated(inode, flags);
196
197 return nfs_check_cache_invalid_not_delegated(inode, flags);
198}
199
6edf9609
TM		 200static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
201{
202 struct nfs_inode *nfsi = NFS_I(inode);
203
204 if (inode->i_mapping->nrpages == 0)
205 flags &= ~NFS_INO_INVALID_DATA;
206 nfsi->cache_validity |= flags;
207 if (flags & NFS_INO_INVALID_DATA)
208 nfs_fscache_invalidate(inode);
209}
210
1da177e4
LT		 211/*
212 * Invalidate the local caches
213 */
b37b03b7 214static void nfs_zap_caches_locked(struct inode *inode)
1da177e4
LT		 215{
216 struct nfs_inode *nfsi = NFS_I(inode);
217 int mode = inode->i_mode;
218
91d5b470
CL		 219 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
220
c7c20973
TM		 221 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
222 nfsi->attrtimeo_timestamp = jiffies;
1da177e4 223
c3f52af3 224 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
de242c0b 225 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
6edf9609 226 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 227 | NFS_INO_INVALID_DATA
228 | NFS_INO_INVALID_ACCESS
229 | NFS_INO_INVALID_ACL
6edf9609 230 | NFS_INO_REVAL_PAGECACHE);
aa9c2669 231 } else
6edf9609 232 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 233 | NFS_INO_INVALID_ACCESS
234 | NFS_INO_INVALID_ACL
6edf9609 235 | NFS_INO_REVAL_PAGECACHE);
fd1defc2 236 nfs_zap_label_cache_locked(nfsi);
b37b03b7 237}
dc59250c 238
b37b03b7
TM		 239void nfs_zap_caches(struct inode *inode)
240{
241 spin_lock(&inode->i_lock);
242 nfs_zap_caches_locked(inode);
dc59250c 243 spin_unlock(&inode->i_lock);
ada70d94
TM		 244}
245
cd9ae2b6
TM		 246void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
247{
248 if (mapping->nrpages != 0) {
249 spin_lock(&inode->i_lock);
6edf9609 250 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
cd9ae2b6
TM		 251 spin_unlock(&inode->i_lock);
252 }
253}
254
f41f7418 255void nfs_zap_acl_cache(struct inode *inode)
ada70d94
TM		 256{
257 void (*clear_acl_cache)(struct inode *);
258
259 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
260 if (clear_acl_cache != NULL)
261 clear_acl_cache(inode);
dc59250c 262 spin_lock(&inode->i_lock);
55296809 263 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
dc59250c 264 spin_unlock(&inode->i_lock);
1da177e4 265}
1c606fb7 266EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
1da177e4 267
c4812998
TM		 268void nfs_invalidate_atime(struct inode *inode)
269{
270 spin_lock(&inode->i_lock);
6edf9609 271 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
c4812998
TM		 272 spin_unlock(&inode->i_lock);
273}
ddda8e0a 274EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
c4812998 275
1da177e4 276/*
b37b03b7
TM		 277 * Invalidate, but do not unhash, the inode.
278 * NB: must be called with inode->i_lock held!
1da177e4 279 */
b37b03b7 280static void nfs_invalidate_inode(struct inode *inode)
1da177e4 281{
3a10c30a 282 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
b37b03b7 283 nfs_zap_caches_locked(inode);
1da177e4
LT		 284}
285
286struct nfs_find_desc {
287 struct nfs_fh *fh;
288 struct nfs_fattr *fattr;
289};
290
291/*
292 * In NFSv3 we can have 64bit inode numbers. In order to support
293 * this, and re-exported directories (also seen in NFSv2)
294 * we are forced to allow 2 different inodes to have the same
295 * i_ino.
296 */
297static int
298nfs_find_actor(struct inode *inode, void *opaque)
299{
300 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
301 struct nfs_fh *fh = desc->fh;
302 struct nfs_fattr *fattr = desc->fattr;
303
304 if (NFS_FILEID(inode) != fattr->fileid)
305 return 0;
f6488c9b
JL		 306 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
307 return 0;
1da177e4
LT		 308 if (nfs_compare_fh(NFS_FH(inode), fh))
309 return 0;
310 if (is_bad_inode(inode) || NFS_STALE(inode))
311 return 0;
312 return 1;
313}
314
315static int
316nfs_init_locked(struct inode *inode, void *opaque)
317{
318 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
319 struct nfs_fattr *fattr = desc->fattr;
320
99fadcd7 321 set_nfs_fileid(inode, fattr->fileid);
916ec34d 322 inode->i_mode = fattr->mode;
1da177e4
LT		 323 nfs_copy_fh(NFS_FH(inode), desc->fh);
324 return 0;
325}
326
e058f70b 327#ifdef CONFIG_NFS_V4_SECURITY_LABEL
fd1defc2
TM		 328static void nfs_clear_label_invalid(struct inode *inode)
329{
330 spin_lock(&inode->i_lock);
331 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
332 spin_unlock(&inode->i_lock);
333}
334
aa9c2669
DQ		 335void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
336 struct nfs4_label *label)
337{
338 int error;
339
340 if (label == NULL)
341 return;
342
aa9c2669
DQ		 343 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
344 error = security_inode_notifysecctx(inode, label->label,
345 label->len);
346 if (error)
347 printk(KERN_ERR "%s() %s %d "
348 "security_inode_notifysecctx() %d\n",
349 __func__,
350 (char *)label->label,
351 label->len, error);
fd1defc2 352 nfs_clear_label_invalid(inode);
aa9c2669
DQ		 353 }
354}
355
e058f70b
SD		 356struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
357{
358 struct nfs4_label *label = NULL;
359 int minor_version = server->nfs_client->cl_minorversion;
360
361 if (minor_version < 2)
362 return label;
363
364 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
365 return label;
366
367 label = kzalloc(sizeof(struct nfs4_label), flags);
368 if (label == NULL)
369 return ERR_PTR(-ENOMEM);
370
371 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
372 if (label->label == NULL) {
373 kfree(label);
374 return ERR_PTR(-ENOMEM);
375 }
376 label->len = NFS4_MAXLABELLEN;
377
378 return label;
379}
380EXPORT_SYMBOL_GPL(nfs4_label_alloc);
aa9c2669 381#else
829e57d7 382void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
aa9c2669
DQ		 383 struct nfs4_label *label)
384{
385}
e058f70b 386#endif
aa9c2669 387EXPORT_SYMBOL_GPL(nfs_setsecurity);
e058f70b 388
f174ff7a
PT		 389/* Search for inode identified by fh, fileid and i_mode in inode cache. */
390struct inode *
391nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
392{
393 struct nfs_find_desc desc = {
394 .fh = fh,
395 .fattr = fattr,
396 };
397 struct inode *inode;
398 unsigned long hash;
399
400 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
401 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
402 return NULL;
403
404 hash = nfs_fattr_to_ino_t(fattr);
405 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
406
407 dprintk("%s: returning %p\n", __func__, inode);
408 return inode;
409}
410
1da177e4
LT		 411/*
412 * This is our front-end to iget that looks up inodes by file handle
413 * instead of inode number.
414 */
415struct inode *
1775fd3e 416nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
1da177e4
LT		 417{
418 struct nfs_find_desc desc = {
419 .fh = fh,
420 .fattr = fattr
421 };
03f28e3a 422 struct inode *inode = ERR_PTR(-ENOENT);
1da177e4
LT		 423 unsigned long hash;
424
7ebb9315
BS		 425 nfs_attr_check_mountpoint(sb, fattr);
426
2ef47eb1
AS		 427 if (nfs_attr_use_mounted_on_fileid(fattr))
428 fattr->fileid = fattr->mounted_on_fileid;
429 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
1da177e4 430 goto out_no_inode;
9e6e70f8 431 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
1da177e4 432 goto out_no_inode;
1da177e4
LT		 433
434 hash = nfs_fattr_to_ino_t(fattr);
435
03f28e3a
TM		 436 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
437 if (inode == NULL) {
438 inode = ERR_PTR(-ENOMEM);
1da177e4 439 goto out_no_inode;
03f28e3a 440 }
1da177e4
LT		 441
442 if (inode->i_state & I_NEW) {
443 struct nfs_inode *nfsi = NFS_I(inode);
b0c4fddc 444 unsigned long now = jiffies;
1da177e4
LT		 445
446 /* We set i_ino for the few things that still rely on it,
447 * such as stat(2) */
448 inode->i_ino = hash;
449
450 /* We can't support update_atime(), since the server will reset it */
451 inode->i_flags |= S_NOATIME|S_NOCMTIME;
452 inode->i_mode = fattr->mode;
62ab460c
TM		 453 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
454 && nfs_server_capable(inode, NFS_CAP_MODE))
6edf9609 455 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
1da177e4
LT		 456 /* Why so? Because we want revalidate for devices/FIFOs, and
457 * that's precisely what we have in nfs_file_inode_operations.
458 */
8fa5c000 459 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
1da177e4 460 if (S_ISREG(inode->i_mode)) {
1788ea6e 461 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
1da177e4 462 inode->i_data.a_ops = &nfs_file_aops;
1da177e4 463 } else if (S_ISDIR(inode->i_mode)) {
8fa5c000 464 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
1da177e4 465 inode->i_fop = &nfs_dir_operations;
11de3b11 466 inode->i_data.a_ops = &nfs_dir_aops;
55a97593 467 /* Deal with crossing mountpoints */
7ebb9315
BS		 468 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
469 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
6b97fd3d
MN		 470 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
471 inode->i_op = &nfs_referral_inode_operations;
472 else
473 inode->i_op = &nfs_mountpoint_inode_operations;
55a97593 474 inode->i_fop = NULL;
36d43a43 475 inode->i_flags |= S_AUTOMOUNT;
55a97593 476 }
21fc61c7 477 } else if (S_ISLNK(inode->i_mode)) {
1da177e4 478 inode->i_op = &nfs_symlink_inode_operations;
21fc61c7
AV		 479 inode_nohighmem(inode);
480 } else
1da177e4
LT		 481 init_special_inode(inode, inode->i_mode, fattr->rdev);
482
9e6e70f8
TM		 483 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
484 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
485 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
1eb5d98f 486 inode_set_iversion_raw(inode, 0);
9e6e70f8 487 inode->i_size = 0;
6d6b77f1 488 clear_nlink(inode);
9ff593c4
EB		 489 inode->i_uid = make_kuid(&init_user_ns, -2);
490 inode->i_gid = make_kgid(&init_user_ns, -2);
9e6e70f8
TM		 491 inode->i_blocks = 0;
492 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
2701d086
AA		 493 nfsi->write_io = 0;
494 nfsi->read_io = 0;
9e6e70f8 495
33801147 496 nfsi->read_cache_jiffies = fattr->time_start;
4704f0e2 497 nfsi->attr_gencount = fattr->gencount;
9e6e70f8
TM		 498 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
499 inode->i_atime = fattr->atime;
62ab460c 500 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
6edf9609 501 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
9e6e70f8
TM		 502 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
503 inode->i_mtime = fattr->mtime;
62ab460c 504 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
6edf9609 505 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
9e6e70f8
TM		 506 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
507 inode->i_ctime = fattr->ctime;
62ab460c 508 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
6edf9609 509 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
9e6e70f8 510 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1eb5d98f 511 inode_set_iversion_raw(inode, fattr->change_attr);
cd812599 512 else
5c675d64
TM		 513 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
514 | NFS_INO_REVAL_PAGECACHE);
9e6e70f8
TM		 515 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
516 inode->i_size = nfs_size_to_loff_t(fattr->size);
62ab460c 517 else
6edf9609
TM		 518 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
519 | NFS_INO_REVAL_PAGECACHE);
9e6e70f8 520 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
bfe86848 521 set_nlink(inode, fattr->nlink);
62ab460c 522 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
6edf9609 523 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
9e6e70f8
TM		 524 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
525 inode->i_uid = fattr->uid;
62ab460c 526 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
6edf9609 527 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
9e6e70f8
TM		 528 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
529 inode->i_gid = fattr->gid;
62ab460c 530 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
6edf9609 531 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
9e6e70f8
TM		 532 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
533 inode->i_blocks = fattr->du.nfs2.blocks;
534 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 535 /*
536 * report the blocks in 512byte units
537 */
538 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1da177e4 539 }
aa9c2669
DQ		 540
541 nfs_setsecurity(inode, fattr, label);
542
1da177e4 543 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
b0c4fddc 544 nfsi->attrtimeo_timestamp = now;
1c3c07e9 545 nfsi->access_cache = RB_ROOT;
1da177e4 546
f1fe29b4 547 nfs_fscache_init_inode(inode);
ef79c097 548
1da177e4 549 unlock_new_inode(inode);
26fde4df
N		 550 } else {
551 int err = nfs_refresh_inode(inode, fattr);
552 if (err < 0) {
553 iput(inode);
554 inode = ERR_PTR(err);
555 goto out_no_inode;
556 }
557 }
1e8968c5 558 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
1da177e4 559 inode->i_sb->s_id,
1e8968c5 560 (unsigned long long)NFS_FILEID(inode),
4f1abd22 561 nfs_display_fhandle_hash(fh),
1da177e4
LT		 562 atomic_read(&inode->i_count));
563
564out:
565 return inode;
566
567out_no_inode:
03f28e3a 568 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
1da177e4
LT		 569 goto out;
570}
89d77c8f 571EXPORT_SYMBOL_GPL(nfs_fhget);
1da177e4 572
536e43d1 573#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		 574
575int
576nfs_setattr(struct dentry *dentry, struct iattr *attr)
577{
2b0143b5 578 struct inode *inode = d_inode(dentry);
987f8dfc 579 struct nfs_fattr *fattr;
ae57ca0f 580 int error = 0;
1da177e4 581
91d5b470
CL		 582 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
583
188b95dd
JL		 584 /* skip mode change if it's just for clearing setuid/setgid */
585 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
586 attr->ia_valid &= ~ATTR_MODE;
587
1da177e4 588 if (attr->ia_valid & ATTR_SIZE) {
08a899d5
CH		 589 BUG_ON(!S_ISREG(inode->i_mode));
590
ae57ca0f
KM		 591 error = inode_newsize_ok(inode, attr->ia_size);
592 if (error)
593 return error;
594
595 if (attr->ia_size == i_size_read(inode))
1da177e4
LT		 596 attr->ia_valid &= ~ATTR_SIZE;
597 }
598
599 /* Optimization: if the end result is no change, don't RPC */
600 attr->ia_valid &= NFS_VALID_ATTRS;
536e43d1 601 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
1da177e4
LT		 602 return 0;
603
f4ce1299
TM		 604 trace_nfs_setattr_enter(inode);
605
755c1e20 606 /* Write all dirty data */
4d346bea
TM		 607 if (S_ISREG(inode->i_mode))
608 nfs_sync_inode(inode);
987f8dfc
TM		 609
610 fattr = nfs_alloc_fattr();
ae57ca0f
KM		 611 if (fattr == NULL) {
612 error = -ENOMEM;
987f8dfc 613 goto out;
ae57ca0f
KM		 614 }
615
987f8dfc 616 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
65e4308d 617 if (error == 0)
aa9c2669 618 error = nfs_refresh_inode(inode, fattr);
987f8dfc
TM		 619 nfs_free_fattr(fattr);
620out:
f4ce1299 621 trace_nfs_setattr_exit(inode, error);
65e4308d
TM		 622 return error;
623}
ddda8e0a 624EXPORT_SYMBOL_GPL(nfs_setattr);
65e4308d 625
a3d01454
TM		 626/**
627 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
628 * @inode: inode of the file used
629 * @offset: file offset to start truncating
630 *
631 * This is a copy of the common vmtruncate, but with the locking
632 * corrected to take into account the fact that NFS requires
633 * inode->i_size to be updated under the inode->i_lock.
f044636d 634 * Note: must be called with inode->i_lock held!
a3d01454
TM		 635 */
636static int nfs_vmtruncate(struct inode * inode, loff_t offset)
637{
c08d3b0e 638 int err;
a3d01454 639
c08d3b0e 640 err = inode_newsize_ok(inode, offset);
641 if (err)
642 goto out;
a3d01454 643
c08d3b0e 644 i_size_write(inode, offset);
6edf9609
TM		 645 /* Optimisation */
646 if (offset == 0)
647 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
c08d3b0e 648
f044636d 649 spin_unlock(&inode->i_lock);
7caef267 650 truncate_pagecache(inode, offset);
f044636d 651 spin_lock(&inode->i_lock);
c08d3b0e 652out:
653 return err;
a3d01454
TM		 654}
655
65e4308d
TM		 656/**
657 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
658 * @inode: pointer to struct inode
659 * @attr: pointer to struct iattr
660 *
661 * Note: we do this in the *proc.c in order to ensure that
662 * it works for things like exclusive creates too.
663 */
f044636d
TM		 664void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
665 struct nfs_fattr *fattr)
65e4308d 666{
f044636d
TM		 667 /* Barrier: bump the attribute generation count. */
668 nfs_fattr_set_barrier(fattr);
669
670 spin_lock(&inode->i_lock);
671 NFS_I(inode)->attr_gencount = fattr->gencount;
65e4308d 672 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
1da177e4 673 if ((attr->ia_valid & ATTR_MODE) != 0) {
65e4308d
TM		 674 int mode = attr->ia_mode & S_IALLUGO;
675 mode |= inode->i_mode & ~S_IALLUGO;
1da177e4
LT		 676 inode->i_mode = mode;
677 }
678 if ((attr->ia_valid & ATTR_UID) != 0)
679 inode->i_uid = attr->ia_uid;
680 if ((attr->ia_valid & ATTR_GID) != 0)
681 inode->i_gid = attr->ia_gid;
6edf9609
TM		 682 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
683 | NFS_INO_INVALID_ACL);
65e4308d
TM		 684 }
685 if ((attr->ia_valid & ATTR_SIZE) != 0) {
91d5b470 686 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
a3d01454 687 nfs_vmtruncate(inode, attr->ia_size);
65e4308d 688 }
616c3196
JL		 689 if (fattr->valid)
690 nfs_update_inode(inode, fattr);
691 else
692 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
f044636d 693 spin_unlock(&inode->i_lock);
1da177e4 694}
ddda8e0a 695EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
1da177e4 696
1bcf4c5c 697static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
311324ad
TM		 698{
699 struct dentry *parent;
700
1bcf4c5c
TM		 701 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
702 return;
311324ad 703 parent = dget_parent(dentry);
2b0143b5 704 nfs_force_use_readdirplus(d_inode(parent));
311324ad
TM		 705 dput(parent);
706}
707
1bcf4c5c
TM		 708static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
709{
710 struct dentry *parent;
711
712 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
713 return;
714 parent = dget_parent(dentry);
715 nfs_advise_use_readdirplus(d_inode(parent));
716 dput(parent);
717}
718
311324ad
TM		 719static bool nfs_need_revalidate_inode(struct inode *inode)
720{
721 if (NFS_I(inode)->cache_validity &
722 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
723 return true;
724 if (nfs_attribute_cache_expired(inode))
725 return true;
726 return false;
727}
728
a528d35e
DH		 729int nfs_getattr(const struct path *path, struct kstat *stat,
730 u32 request_mask, unsigned int query_flags)
1da177e4 731{
a528d35e 732 struct inode *inode = d_inode(path->dentry);
9ccee940
TM		 733 struct nfs_server *server = NFS_SERVER(inode);
734 unsigned long cache_validity;
16caf5b6 735 int err = 0;
9ccee940
TM		 736 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
737 bool do_update = false;
1da177e4 738
f4ce1299 739 trace_nfs_getattr_enter(inode);
9ccee940
TM		 740
741 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync)
742 goto out_no_update;
743
acdc53b2 744 /* Flush out writes to the server in order to update c/mtime. */
9ccee940
TM		 745 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
746 S_ISREG(inode->i_mode)) {
79566ef0 747 err = filemap_write_and_wait(inode->i_mapping);
acdc53b2
TM		 748 if (err)
749 goto out;
28c494c5 750 }
fc33a7bb
CH		 751
752 /*
753 * We may force a getattr if the user cares about atime.
754 *
755 * Note that we only have to check the vfsmount flags here:
756 * - NFS always sets S_NOATIME by so checking it would give a
757 * bogus result
1751e8a6 758 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
fc33a7bb
CH		 759 * no point in checking those.
760 */
a528d35e
DH		 761 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
762 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
9ccee940
TM		 763 request_mask &= ~STATX_ATIME;
764
765 /* Is the user requesting attributes that might need revalidation? */
766 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
767 STATX_MTIME|STATX_UID|STATX_GID|
768 STATX_SIZE|STATX_BLOCKS)))
769 goto out_no_revalidate;
770
771 /* Check whether the cached attributes are stale */
772 do_update |= force_sync || nfs_attribute_cache_expired(inode);
773 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
774 do_update |= cache_validity &
775 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
776 if (request_mask & STATX_ATIME)
777 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
778 if (request_mask & (STATX_CTIME|STATX_MTIME))
779 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
780 if (do_update) {
781 /* Update the attribute cache */
59b86d85
HT		 782 if (!(server->flags & NFS_MOUNT_NOAC))
783 nfs_readdirplus_parent_cache_miss(path->dentry);
784 else
785 nfs_readdirplus_parent_cache_hit(path->dentry);
311324ad 786 err = __nfs_revalidate_inode(server, inode);
9ccee940
TM		 787 if (err)
788 goto out;
1bcf4c5c 789 } else
a528d35e 790 nfs_readdirplus_parent_cache_hit(path->dentry);
9ccee940
TM		 791out_no_revalidate:
792 /* Only return attributes that were revalidated. */
793 stat->result_mask &= request_mask;
794out_no_update:
795 generic_fillattr(inode, stat);
796 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
797 if (S_ISDIR(inode->i_mode))
798 stat->blksize = NFS_SERVER(inode)->dtsize;
acdc53b2 799out:
f4ce1299 800 trace_nfs_getattr_exit(inode, err);
1da177e4
LT		 801 return err;
802}
ddda8e0a 803EXPORT_SYMBOL_GPL(nfs_getattr);
1da177e4 804
f11ac8db
TM		 805static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
806{
2f62b5aa 807 refcount_set(&l_ctx->count, 1);
d51fdb87 808 l_ctx->lockowner = current->files;
f11ac8db 809 INIT_LIST_HEAD(&l_ctx->list);
210c7c17 810 atomic_set(&l_ctx->io_count, 0);
f11ac8db
TM		 811}
812
813static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
814{
8c86899f
TM		 815 struct nfs_lock_context *head = &ctx->lock_context;
816 struct nfs_lock_context *pos = head;
f11ac8db 817
8c86899f 818 do {
d51fdb87 819 if (pos->lockowner != current->files)
f11ac8db 820 continue;
2f62b5aa 821 refcount_inc(&pos->count);
f11ac8db 822 return pos;
8c86899f 823 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
f11ac8db
TM		 824 return NULL;
825}
826
827struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
828{
829 struct nfs_lock_context *res, *new = NULL;
2b0143b5 830 struct inode *inode = d_inode(ctx->dentry);
f11ac8db
TM		 831
832 spin_lock(&inode->i_lock);
833 res = __nfs_find_lock_context(ctx);
834 if (res == NULL) {
835 spin_unlock(&inode->i_lock);
836 new = kmalloc(sizeof(*new), GFP_KERNEL);
837 if (new == NULL)
b3c54de6 838 return ERR_PTR(-ENOMEM);
f11ac8db
TM		 839 nfs_init_lock_context(new);
840 spin_lock(&inode->i_lock);
841 res = __nfs_find_lock_context(ctx);
842 if (res == NULL) {
843 list_add_tail(&new->list, &ctx->lock_context.list);
844 new->open_context = ctx;
845 res = new;
846 new = NULL;
847 }
848 }
849 spin_unlock(&inode->i_lock);
850 kfree(new);
851 return res;
852}
1c6dcbe5 853EXPORT_SYMBOL_GPL(nfs_get_lock_context);
f11ac8db
TM		 854
855void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
856{
857 struct nfs_open_context *ctx = l_ctx->open_context;
2b0143b5 858 struct inode *inode = d_inode(ctx->dentry);
f11ac8db 859
2f62b5aa 860 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
f11ac8db
TM		 861 return;
862 list_del(&l_ctx->list);
863 spin_unlock(&inode->i_lock);
864 kfree(l_ctx);
865}
1c6dcbe5 866EXPORT_SYMBOL_GPL(nfs_put_lock_context);
f11ac8db 867
7fe5c398
TM		 868/**
869 * nfs_close_context - Common close_context() routine NFSv2/v3
870 * @ctx: pointer to context
871 * @is_sync: is this a synchronous close
872 *
5cf9d706
TM		 873 * Ensure that the attributes are up to date if we're mounted
874 * with close-to-open semantics and we have cached data that will
875 * need to be revalidated on open.
7fe5c398
TM		 876 */
877void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
878{
5cf9d706 879 struct nfs_inode *nfsi;
7fe5c398
TM		 880 struct inode *inode;
881 struct nfs_server *server;
882
883 if (!(ctx->mode & FMODE_WRITE))
884 return;
885 if (!is_sync)
886 return;
2b0143b5 887 inode = d_inode(ctx->dentry);
58ff4184
TM		 888 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
889 return;
5cf9d706
TM		 890 nfsi = NFS_I(inode);
891 if (inode->i_mapping->nrpages == 0)
892 return;
893 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
894 return;
895 if (!list_empty(&nfsi->open_files))
7fe5c398
TM		 896 return;
897 server = NFS_SERVER(inode);
898 if (server->flags & NFS_MOUNT_NOCTO)
899 return;
900 nfs_revalidate_inode(server, inode);
901}
ddda8e0a 902EXPORT_SYMBOL_GPL(nfs_close_context);
7fe5c398 903
532d4def
N		 904struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
905 fmode_t f_mode,
906 struct file *filp)
1da177e4
LT		 907{
908 struct nfs_open_context *ctx;
5ede7b1c
AV		 909 struct rpc_cred *cred = rpc_lookup_cred();
910 if (IS_ERR(cred))
911 return ERR_CAST(cred);
1da177e4 912
f52720ca 913 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
5ede7b1c
AV		 914 if (!ctx) {
915 put_rpccred(cred);
916 return ERR_PTR(-ENOMEM);
1da177e4 917 }
5ede7b1c
AV		 918 nfs_sb_active(dentry->d_sb);
919 ctx->dentry = dget(dentry);
920 ctx->cred = cred;
921 ctx->state = NULL;
922 ctx->mode = f_mode;
923 ctx->flags = 0;
924 ctx->error = 0;
532d4def 925 ctx->flock_owner = (fl_owner_t)filp;
5ede7b1c
AV		 926 nfs_init_lock_context(&ctx->lock_context);
927 ctx->lock_context.open_context = ctx;
928 INIT_LIST_HEAD(&ctx->list);
82be417a 929 ctx->mdsthreshold = NULL;
1da177e4
LT		 930 return ctx;
931}
89d77c8f 932EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1da177e4
LT		 933
934struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
935{
936 if (ctx != NULL)
2f62b5aa 937 refcount_inc(&ctx->lock_context.count);
1da177e4
LT		 938 return ctx;
939}
89d77c8f 940EXPORT_SYMBOL_GPL(get_nfs_open_context);
1da177e4 941
7fe5c398 942static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1da177e4 943{
2b0143b5 944 struct inode *inode = d_inode(ctx->dentry);
3d4ff43d 945 struct super_block *sb = ctx->dentry->d_sb;
3bec63db 946
5c78f58e 947 if (!list_empty(&ctx->list)) {
2f62b5aa 948 if (!refcount_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
ef84303e
BH		 949 return;
950 list_del(&ctx->list);
951 spin_unlock(&inode->i_lock);
2f62b5aa 952 } else if (!refcount_dec_and_test(&ctx->lock_context.count))
5e11934d 953 return;
5c78f58e
TM		 954 if (inode != NULL)
955 NFS_PROTO(inode)->close_context(ctx, is_sync);
3bec63db
TM		 956 if (ctx->cred != NULL)
957 put_rpccred(ctx->cred);
3d4ff43d 958 dput(ctx->dentry);
322b2b90 959 nfs_sb_deactive(sb);
82be417a 960 kfree(ctx->mdsthreshold);
3bec63db
TM		 961 kfree(ctx);
962}
963
a49c3c77
TM		 964void put_nfs_open_context(struct nfs_open_context *ctx)
965{
966 __put_nfs_open_context(ctx, 0);
967}
89d77c8f 968EXPORT_SYMBOL_GPL(put_nfs_open_context);
a49c3c77 969
4eae5014
TM		 970static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
971{
972 __put_nfs_open_context(ctx, 1);
973}
974
1da177e4
LT		 975/*
976 * Ensure that mmap has a recent RPC credential for use when writing out
977 * shared pages
978 */
c45ffdd2 979void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1da177e4 980{
2b0143b5 981 struct inode *inode = d_inode(ctx->dentry);
1da177e4
LT		 982 struct nfs_inode *nfsi = NFS_I(inode);
983
1da177e4 984 spin_lock(&inode->i_lock);
ca0daa27
TM		 985 if (ctx->mode & FMODE_WRITE)
986 list_add(&ctx->list, &nfsi->open_files);
987 else
988 list_add_tail(&ctx->list, &nfsi->open_files);
1da177e4
LT		 989 spin_unlock(&inode->i_lock);
990}
c45ffdd2
TM		 991EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
992
993void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
994{
995 filp->private_data = get_nfs_open_context(ctx);
996 if (list_empty(&ctx->list))
997 nfs_inode_attach_open_context(ctx);
998}
89d77c8f 999EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1da177e4 1000
d530838b
TM		 1001/*
1002 * Given an inode, search for an open context with the desired characteristics
1003 */
dc0b027d 1004struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
1da177e4
LT		 1005{
1006 struct nfs_inode *nfsi = NFS_I(inode);
1007 struct nfs_open_context *pos, *ctx = NULL;
1008
1009 spin_lock(&inode->i_lock);
1010 list_for_each_entry(pos, &nfsi->open_files, list) {
d530838b
TM		 1011 if (cred != NULL && pos->cred != cred)
1012 continue;
1544fa0f
TM		 1013 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1014 continue;
1015 ctx = get_nfs_open_context(pos);
1016 break;
1da177e4
LT		 1017 }
1018 spin_unlock(&inode->i_lock);
1019 return ctx;
1020}
1021
aff8d8dc 1022void nfs_file_clear_open_context(struct file *filp)
1da177e4 1023{
cd3758e3 1024 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1da177e4
LT		 1025
1026 if (ctx) {
2b0143b5 1027 struct inode *inode = d_inode(ctx->dentry);
c45ffdd2 1028
0bcbf039
PT		 1029 /*
1030 * We fatal error on write before. Try to writeback
1031 * every page again.
1032 */
1033 if (ctx->error < 0)
1034 invalidate_inode_pages2(inode->i_mapping);
1da177e4
LT		 1035 filp->private_data = NULL;
1036 spin_lock(&inode->i_lock);
1037 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
1038 spin_unlock(&inode->i_lock);
4eae5014 1039 put_nfs_open_context_sync(ctx);
1da177e4
LT		 1040 }
1041}
1042
1043/*
1044 * These allocate and release file read/write context information.
1045 */
1046int nfs_open(struct inode *inode, struct file *filp)
1047{
1048 struct nfs_open_context *ctx;
1da177e4 1049
532d4def 1050 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
5ede7b1c
AV		 1051 if (IS_ERR(ctx))
1052 return PTR_ERR(ctx);
1da177e4
LT		 1053 nfs_file_set_open_context(filp, ctx);
1054 put_nfs_open_context(ctx);
f1fe29b4 1055 nfs_fscache_open_file(inode, filp);
1da177e4
LT		 1056 return 0;
1057}
1058
1da177e4
LT		 1059/*
1060 * This function is called whenever some part of NFS notices that
1061 * the cached attributes have to be refreshed.
1062 */
1063int
1064__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1065{
1066 int status = -ESTALE;
1775fd3e 1067 struct nfs4_label *label = NULL;
a3cba2aa 1068 struct nfs_fattr *fattr = NULL;
1da177e4 1069 struct nfs_inode *nfsi = NFS_I(inode);
1da177e4 1070
1e8968c5
NV		 1071 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1072 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1da177e4 1073
f4ce1299
TM		 1074 trace_nfs_revalidate_inode_enter(inode);
1075
85233a7a 1076 if (is_bad_inode(inode))
691beb13 1077 goto out;
1da177e4 1078 if (NFS_STALE(inode))
412d582e 1079 goto out;
7fdc49c4 1080
ac46bd37
TM		 1081 /* pNFS: Attributes aren't updated until we layoutcommit */
1082 if (S_ISREG(inode->i_mode)) {
1083 status = pnfs_sync_inode(inode, false);
1084 if (status)
1085 goto out;
1086 }
1087
a3cba2aa
TM		 1088 status = -ENOMEM;
1089 fattr = nfs_alloc_fattr();
1090 if (fattr == NULL)
1091 goto out;
1092
691beb13 1093 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
14c43f76
DQ		 1094
1095 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1096 if (IS_ERR(label)) {
1097 status = PTR_ERR(label);
1098 goto out;
1099 }
1100
1775fd3e 1101 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
1da177e4 1102 if (status != 0) {
1e8968c5 1103 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1da177e4 1104 inode->i_sb->s_id,
1e8968c5 1105 (unsigned long long)NFS_FILEID(inode), status);
1da177e4
LT		 1106 if (status == -ESTALE) {
1107 nfs_zap_caches(inode);
1108 if (!S_ISDIR(inode->i_mode))
3a10c30a 1109 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1da177e4 1110 }
14c43f76 1111 goto err_out;
1da177e4
LT		 1112 }
1113
a3cba2aa 1114 status = nfs_refresh_inode(inode, fattr);
1da177e4 1115 if (status) {
1e8968c5 1116 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1da177e4 1117 inode->i_sb->s_id,
1e8968c5 1118 (unsigned long long)NFS_FILEID(inode), status);
14c43f76 1119 goto err_out;
1da177e4 1120 }
55296809 1121
24aa1fe6 1122 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
ada70d94 1123 nfs_zap_acl_cache(inode);
55296809 1124
3da580aa
JL		 1125 nfs_setsecurity(inode, fattr, label);
1126
1e8968c5 1127 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1da177e4 1128 inode->i_sb->s_id,
1e8968c5 1129 (unsigned long long)NFS_FILEID(inode));
1da177e4 1130
14c43f76
DQ		 1131err_out:
1132 nfs4_label_free(label);
1133out:
a3cba2aa 1134 nfs_free_fattr(fattr);
f4ce1299 1135 trace_nfs_revalidate_inode_exit(inode, status);
1da177e4
LT		 1136 return status;
1137}
1138
43f291cd 1139int nfs_attribute_cache_expired(struct inode *inode)
d7cf8dd0 1140{
b4d2314b 1141 if (nfs_have_delegated_attributes(inode))
1da177e4 1142 return 0;
d7cf8dd0 1143 return nfs_attribute_timeout(inode);
1da177e4
LT		 1144}
1145
1146/**
1147 * nfs_revalidate_inode - Revalidate the inode attributes
1148 * @server - pointer to nfs_server struct
1149 * @inode - pointer to inode struct
1150 *
1151 * Updates inode attribute information by retrieving the data from the server.
1152 */
1153int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1154{
311324ad 1155 if (!nfs_need_revalidate_inode(inode))
1da177e4
LT		 1156 return NFS_STALE(inode) ? -ESTALE : 0;
1157 return __nfs_revalidate_inode(server, inode);
1158}
1c606fb7 1159EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1da177e4 1160
1cda707d 1161static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
717d44e8
TM		 1162{
1163 struct nfs_inode *nfsi = NFS_I(inode);
f8806c84
TM		 1164 int ret;
1165
717d44e8 1166 if (mapping->nrpages != 0) {
f8806c84
TM		 1167 if (S_ISREG(inode->i_mode)) {
1168 ret = nfs_sync_mapping(mapping);
1169 if (ret < 0)
1170 return ret;
1171 }
1172 ret = invalidate_inode_pages2(mapping);
717d44e8
TM		 1173 if (ret < 0)
1174 return ret;
1175 }
d529ef83
JL		 1176 if (S_ISDIR(inode->i_mode)) {
1177 spin_lock(&inode->i_lock);
717d44e8 1178 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
d529ef83
JL		 1179 spin_unlock(&inode->i_lock);
1180 }
717d44e8 1181 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
de242c0b 1182 nfs_fscache_wait_on_invalidate(inode);
f4ce1299 1183
1e8968c5
NV		 1184 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1185 inode->i_sb->s_id,
1186 (unsigned long long)NFS_FILEID(inode));
717d44e8
TM		 1187 return 0;
1188}
1189
1cd9cb05 1190bool nfs_mapping_need_revalidate_inode(struct inode *inode)
b4b1eadf 1191{
61540bf6
TM		 1192 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1193 NFS_STALE(inode);
b4b1eadf
TM		 1194}
1195
0d0def49
AV		 1196int nfs_revalidate_mapping_rcu(struct inode *inode)
1197{
1198 struct nfs_inode *nfsi = NFS_I(inode);
1199 unsigned long *bitlock = &nfsi->flags;
1200 int ret = 0;
1201
1202 if (IS_SWAPFILE(inode))
1203 goto out;
1204 if (nfs_mapping_need_revalidate_inode(inode)) {
1205 ret = -ECHILD;
1206 goto out;
1207 }
1208 spin_lock(&inode->i_lock);
1209 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1210 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1211 ret = -ECHILD;
1212 spin_unlock(&inode->i_lock);
1213out:
1214 return ret;
1215}
1216
717d44e8 1217/**
be527494 1218 * nfs_revalidate_mapping - Revalidate the pagecache
717d44e8
TM		 1219 * @inode - pointer to host inode
1220 * @mapping - pointer to mapping
717d44e8 1221 */
be527494
TM		 1222int nfs_revalidate_mapping(struct inode *inode,
1223 struct address_space *mapping)
717d44e8
TM		 1224{
1225 struct nfs_inode *nfsi = NFS_I(inode);
d529ef83 1226 unsigned long *bitlock = &nfsi->flags;
717d44e8 1227 int ret = 0;
dc59250c 1228
29418aa4
MG		 1229 /* swapfiles are not supposed to be shared. */
1230 if (IS_SWAPFILE(inode))
1231 goto out;
1232
b4b1eadf 1233 if (nfs_mapping_need_revalidate_inode(inode)) {
717d44e8
TM		 1234 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1235 if (ret < 0)
1236 goto out;
7d52e862 1237 }
d529ef83
JL		 1238
1239 /*
1240 * We must clear NFS_INO_INVALID_DATA first to ensure that
1241 * invalidations that come in while we're shooting down the mappings
1242 * are respected. But, that leaves a race window where one revalidator
1243 * can clear the flag, and then another checks it before the mapping
1244 * gets invalidated. Fix that by serializing access to this part of
1245 * the function.
1246 *
1247 * At the same time, we need to allow other tasks to see whether we
1248 * might be in the middle of invalidating the pages, so we only set
1249 * the bit lock here if it looks like we're going to be doing that.
1250 */
1251 for (;;) {
74316201
N		 1252 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1253 nfs_wait_bit_killable, TASK_KILLABLE);
d529ef83
JL		 1254 if (ret)
1255 goto out;
17dfeb91
TM		 1256 spin_lock(&inode->i_lock);
1257 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1258 spin_unlock(&inode->i_lock);
1259 continue;
1260 }
1261 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
d529ef83 1262 break;
d529ef83 1263 spin_unlock(&inode->i_lock);
17dfeb91 1264 goto out;
f4ce1299
TM		 1265 }
1266
17dfeb91 1267 set_bit(NFS_INO_INVALIDATING, bitlock);
4db72b40 1268 smp_wmb();
17dfeb91
TM		 1269 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1270 spin_unlock(&inode->i_lock);
1271 trace_nfs_invalidate_mapping_enter(inode);
be527494 1272 ret = nfs_invalidate_mapping(inode, mapping);
17dfeb91
TM		 1273 trace_nfs_invalidate_mapping_exit(inode, ret);
1274
d529ef83 1275 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
4e857c58 1276 smp_mb__after_atomic();
d529ef83 1277 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
cd9ae2b6 1278out:
44b11874 1279 return ret;
7d52e862
TM		 1280}
1281
ca0daa27 1282static bool nfs_file_has_writers(struct nfs_inode *nfsi)
874f9463 1283{
ca0daa27
TM		 1284 struct inode *inode = &nfsi->vfs_inode;
1285
1286 assert_spin_locked(&inode->i_lock);
1287
1288 if (!S_ISREG(inode->i_mode))
1289 return false;
1290 if (list_empty(&nfsi->open_files))
1291 return false;
1292 /* Note: This relies on nfsi->open_files being ordered with writers
1293 * being placed at the head of the list.
1294 * See nfs_inode_attach_open_context()
1295 */
1296 return (list_first_entry(&nfsi->open_files,
1297 struct nfs_open_context,
1298 list)->mode & FMODE_WRITE) == FMODE_WRITE;
874f9463
TM		 1299}
1300
651b0e70 1301static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
874f9463 1302{
651b0e70 1303 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
874f9463
TM		 1304}
1305
783b194c 1306static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
a895b4a1 1307{
9e6e70f8
TM		 1308 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1309 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
c472c07b 1310 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1eb5d98f 1311 inode_set_iversion_raw(inode, fattr->change_attr);
70ca8852 1312 if (S_ISDIR(inode->i_mode))
6edf9609 1313 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
70ca8852 1314 }
a895b4a1 1315 /* If we have atomic WCC data, we may update some attributes */
9e6e70f8
TM		 1316 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1317 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
27dc1cd3
TM		 1318 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1319 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
27dc1cd3 1320 }
9e6e70f8
TM		 1321
1322 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1323 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1324 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
27dc1cd3
TM		 1325 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1326 if (S_ISDIR(inode->i_mode))
6edf9609 1327 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
a895b4a1 1328 }
9e6e70f8
TM		 1329 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1330 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1331 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
a6b6d5b8 1332 && !nfs_have_writebacks(inode)) {
27dc1cd3 1333 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
27dc1cd3 1334 }
a895b4a1
TM		 1335}
1336
1da177e4 1337/**
33801147 1338 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1da177e4
LT		 1339 * @inode - pointer to inode
1340 * @fattr - updated attributes
1341 *
1342 * Verifies the attribute cache. If we have just changed the attributes,
1343 * so that fattr carries weak cache consistency data, then it may
1344 * also update the ctime/mtime/change_attribute.
1345 */
33801147 1346static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1da177e4
LT		 1347{
1348 struct nfs_inode *nfsi = NFS_I(inode);
1349 loff_t cur_size, new_isize;
2a3f5fd4 1350 unsigned long invalid = 0;
1da177e4 1351
dc59250c 1352
01da47bd
TM		 1353 if (nfs_have_delegated_attributes(inode))
1354 return 0;
ca62b9c3 1355 /* Has the inode gone and changed behind our back? */
9e6e70f8 1356 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
cc89684c 1357 return -ESTALE;
9e6e70f8 1358 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
cc89684c 1359 return -ESTALE;
ca62b9c3 1360
651b0e70 1361 if (!nfs_file_has_buffered_writers(nfsi)) {
ca0daa27 1362 /* Verify a few of the more important attributes */
c472c07b 1363 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
ca0daa27 1364 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_REVAL_PAGECACHE;
1da177e4 1365
ca0daa27
TM		 1366 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1367 invalid |= NFS_INO_INVALID_ATTR;
ca62b9c3 1368
ca0daa27
TM		 1369 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&inode->i_ctime, &fattr->ctime))
1370 invalid |= NFS_INO_INVALID_ATTR;
1371
1372 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1373 cur_size = i_size_read(inode);
1374 new_isize = nfs_size_to_loff_t(fattr->size);
1375 if (cur_size != new_isize)
1376 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1377 }
9e6e70f8 1378 }
1da177e4
LT		 1379
1380 /* Have any file permissions changed? */
9e6e70f8
TM		 1381 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1382 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
9ff593c4 1383 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
9e6e70f8 1384 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
9ff593c4 1385 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
2a3f5fd4 1386 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1da177e4
LT		 1387
1388 /* Has the link count changed? */
9e6e70f8 1389 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
2a3f5fd4 1390 invalid |= NFS_INO_INVALID_ATTR;
1da177e4 1391
9e6e70f8 1392 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
2a3f5fd4
TM		 1393 invalid |= NFS_INO_INVALID_ATIME;
1394
1395 if (invalid != 0)
1ad13dbc 1396 nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED);
1da177e4 1397
33801147 1398 nfsi->read_cache_jiffies = fattr->time_start;
1da177e4
LT		 1399 return 0;
1400}
1401
ae05f269 1402static atomic_long_t nfs_attr_generation_counter;
4704f0e2
TM		 1403
1404static unsigned long nfs_read_attr_generation_counter(void)
1405{
ae05f269 1406 return atomic_long_read(&nfs_attr_generation_counter);
4704f0e2
TM		 1407}
1408
1409unsigned long nfs_inc_attr_generation_counter(void)
1410{
ae05f269 1411 return atomic_long_inc_return(&nfs_attr_generation_counter);
4704f0e2 1412}
3235b403 1413EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
4704f0e2
TM		 1414
1415void nfs_fattr_init(struct nfs_fattr *fattr)
1416{
1417 fattr->valid = 0;
1418 fattr->time_start = jiffies;
1419 fattr->gencount = nfs_inc_attr_generation_counter();
6926afd1
TM		 1420 fattr->owner_name = NULL;
1421 fattr->group_name = NULL;
4704f0e2 1422}
ddda8e0a 1423EXPORT_SYMBOL_GPL(nfs_fattr_init);
4704f0e2 1424
140e049c
TM		 1425/**
1426 * nfs_fattr_set_barrier
1427 * @fattr: attributes
1428 *
1429 * Used to set a barrier after an attribute was updated. This
1430 * barrier ensures that older attributes from RPC calls that may
1431 * have raced with our update cannot clobber these new values.
1432 * Note that you are still responsible for ensuring that other
1433 * operations which change the attribute on the server do not
1434 * collide.
1435 */
1436void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1437{
1438 fattr->gencount = nfs_inc_attr_generation_counter();
1439}
1440
2d36bfde
TM		 1441struct nfs_fattr *nfs_alloc_fattr(void)
1442{
1443 struct nfs_fattr *fattr;
1444
1445 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1446 if (fattr != NULL)
1447 nfs_fattr_init(fattr);
1448 return fattr;
1449}
ddda8e0a 1450EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
2d36bfde
TM		 1451
1452struct nfs_fh *nfs_alloc_fhandle(void)
1453{
1454 struct nfs_fh *fh;
1455
1456 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1457 if (fh != NULL)
1458 fh->size = 0;
1459 return fh;
1460}
ddda8e0a 1461EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
2d36bfde 1462
e27d359e 1463#ifdef NFS_DEBUG
d8e0539e
WAA		 1464/*
1465 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1466 * in the same way that wireshark does
1467 *
1468 * @fh: file handle
1469 *
1470 * For debugging only.
1471 */
1472u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1473{
1474 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1475 * not on the result */
1264a2f0 1476 return nfs_fhandle_hash(fh);
d8e0539e 1477}
9e6ee76d 1478EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
d8e0539e
WAA		 1479
1480/*
20d27e92
CL		 1481 * _nfs_display_fhandle - display an NFS file handle on the console
1482 *
1483 * @fh: file handle to display
1484 * @caption: display caption
1485 *
1486 * For debugging only.
1487 */
20d27e92
CL		 1488void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1489{
1490 unsigned short i;
1491
fa68a1ba 1492 if (fh == NULL || fh->size == 0) {
20d27e92
CL		 1493 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1494 return;
1495 }
1496
d8e0539e
WAA		 1497 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1498 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
20d27e92
CL		 1499 for (i = 0; i < fh->size; i += 16) {
1500 __be32 *pos = (__be32 *)&fh->data[i];
1501
1502 switch ((fh->size - i - 1) >> 2) {
1503 case 0:
1504 printk(KERN_DEFAULT " %08x\n",
1505 be32_to_cpup(pos));
1506 break;
1507 case 1:
1508 printk(KERN_DEFAULT " %08x %08x\n",
1509 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1510 break;
1511 case 2:
1512 printk(KERN_DEFAULT " %08x %08x %08x\n",
1513 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1514 be32_to_cpup(pos + 2));
1515 break;
1516 default:
1517 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1518 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1519 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1520 }
1521 }
1522}
9e6ee76d 1523EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
20d27e92
CL		 1524#endif
1525
a10ad176
TM		 1526/**
1527 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1528 * @inode - pointer to inode
1529 * @fattr - attributes
1530 *
1531 * Attempt to divine whether or not an RPC call reply carrying stale
1532 * attributes got scheduled after another call carrying updated ones.
1533 *
1534 * To do so, the function first assumes that a more recent ctime means
1535 * that the attributes in fattr are newer, however it also attempt to
1536 * catch the case where ctime either didn't change, or went backwards
1537 * (if someone reset the clock on the server) by looking at whether
1538 * or not this RPC call was started after the inode was last updated.
4704f0e2 1539 * Note also the check for wraparound of 'attr_gencount'
a10ad176
TM		 1540 *
1541 * The function returns 'true' if it thinks the attributes in 'fattr' are
1542 * more recent than the ones cached in the inode.
1543 *
1544 */
1545static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1546{
1547 const struct nfs_inode *nfsi = NFS_I(inode);
1548
4704f0e2 1549 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
4704f0e2 1550 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
a10ad176
TM		 1551}
1552
1553static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1554{
f4ce1299
TM		 1555 int ret;
1556
1557 trace_nfs_refresh_inode_enter(inode);
1558
a10ad176 1559 if (nfs_inode_attrs_need_update(inode, fattr))
f4ce1299
TM		 1560 ret = nfs_update_inode(inode, fattr);
1561 else
1562 ret = nfs_check_inode_attributes(inode, fattr);
1563
1564 trace_nfs_refresh_inode_exit(inode, ret);
1565 return ret;
870a5be8
TM		 1566}
1567
33801147
TM		 1568/**
1569 * nfs_refresh_inode - try to update the inode attribute cache
1570 * @inode - pointer to inode
1571 * @fattr - updated attributes
1572 *
1573 * Check that an RPC call that returned attributes has not overlapped with
1574 * other recent updates of the inode metadata, then decide whether it is
1575 * safe to do a full update of the inode attributes, or whether just to
1576 * call nfs_check_inode_attributes.
1577 */
1578int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1579{
33801147
TM		 1580 int status;
1581
1582 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1583 return 0;
1584 spin_lock(&inode->i_lock);
870a5be8 1585 status = nfs_refresh_inode_locked(inode, fattr);
33801147 1586 spin_unlock(&inode->i_lock);
ef79c097 1587
33801147
TM		 1588 return status;
1589}
ddda8e0a 1590EXPORT_SYMBOL_GPL(nfs_refresh_inode);
33801147 1591
d65f557f
TM		 1592static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1593{
ca0daa27 1594 unsigned long invalid = NFS_INO_INVALID_ATTR;
d65f557f 1595
6edf9609
TM		 1596 if (S_ISDIR(inode->i_mode))
1597 invalid |= NFS_INO_INVALID_DATA;
1598 nfs_set_cache_invalid(inode, invalid);
d65f557f
TM		 1599 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1600 return 0;
1601 return nfs_refresh_inode_locked(inode, fattr);
1602}
1603
decf491f
TM		 1604/**
1605 * nfs_post_op_update_inode - try to update the inode attribute cache
1606 * @inode - pointer to inode
1607 * @fattr - updated attributes
1608 *
1609 * After an operation that has changed the inode metadata, mark the
1610 * attribute cache as being invalid, then try to update it.
f551e44f
CL		 1611 *
1612 * NB: if the server didn't return any post op attributes, this
1613 * function will force the retrieval of attributes before the next
1614 * NFS request. Thus it should be used only for operations that
1615 * are expected to change one or more attributes, to avoid
1616 * unnecessary NFS requests and trips through nfs_update_inode().
decf491f
TM		 1617 */
1618int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1619{
d65f557f 1620 int status;
decf491f 1621
7668fdbe 1622 spin_lock(&inode->i_lock);
92d64e47 1623 nfs_fattr_set_barrier(fattr);
d65f557f 1624 status = nfs_post_op_update_inode_locked(inode, fattr);
7668fdbe 1625 spin_unlock(&inode->i_lock);
aa9c2669 1626
870a5be8 1627 return status;
decf491f 1628}
1c606fb7 1629EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
decf491f 1630
70ca8852 1631/**
a08a8cd3 1632 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
70ca8852
TM		 1633 * @inode - pointer to inode
1634 * @fattr - updated attributes
1635 *
1636 * After an operation that has changed the inode metadata, mark the
1637 * attribute cache as being invalid, then try to update it. Fake up
1638 * weak cache consistency data, if none exist.
1639 *
1640 * This function is mainly designed to be used by the ->write_done() functions.
1641 */
a08a8cd3 1642int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
70ca8852 1643{
d65f557f
TM		 1644 int status;
1645
d65f557f
TM		 1646 /* Don't do a WCC update if these attributes are already stale */
1647 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1648 !nfs_inode_attrs_need_update(inode, fattr)) {
9e6e70f8
TM		 1649 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1650 | NFS_ATTR_FATTR_PRESIZE
1651 | NFS_ATTR_FATTR_PREMTIME
1652 | NFS_ATTR_FATTR_PRECTIME);
d65f557f
TM		 1653 goto out_noforce;
1654 }
9e6e70f8
TM		 1655 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1656 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1eb5d98f 1657 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
9e6e70f8 1658 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
70ca8852 1659 }
9e6e70f8
TM		 1660 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1661 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
70ca8852 1662 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
9e6e70f8
TM		 1663 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1664 }
1665 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1666 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
70ca8852 1667 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
9e6e70f8
TM		 1668 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1669 }
1670 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1671 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
a3d01454 1672 fattr->pre_size = i_size_read(inode);
9e6e70f8 1673 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
70ca8852 1674 }
d65f557f
TM		 1675out_noforce:
1676 status = nfs_post_op_update_inode_locked(inode, fattr);
a08a8cd3
TM		 1677 return status;
1678}
1679
1680/**
1681 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1682 * @inode - pointer to inode
1683 * @fattr - updated attributes
1684 *
1685 * After an operation that has changed the inode metadata, mark the
1686 * attribute cache as being invalid, then try to update it. Fake up
1687 * weak cache consistency data, if none exist.
1688 *
1689 * This function is mainly designed to be used by the ->write_done() functions.
1690 */
1691int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1692{
1693 int status;
1694
1695 spin_lock(&inode->i_lock);
8f8ba1d7 1696 nfs_fattr_set_barrier(fattr);
a08a8cd3 1697 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
d65f557f
TM		 1698 spin_unlock(&inode->i_lock);
1699 return status;
70ca8852 1700}
ddda8e0a 1701EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
70ca8852 1702
ea96d1ec
AS		 1703
1704static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1705 struct nfs_fattr *fattr)
1706{
1707 bool ret1 = true, ret2 = true;
1708
1709 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1710 ret1 = (nfsi->fileid == fattr->fileid);
1711 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1712 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1713 return ret1 || ret2;
1714}
1715
1da177e4
LT		 1716/*
1717 * Many nfs protocol calls return the new file attributes after
1718 * an operation. Here we update the inode to reflect the state
1719 * of the server's inode.
1720 *
1721 * This is a bit tricky because we have to make sure all dirty pages
1722 * have been sent off to the server before calling invalidate_inode_pages.
1723 * To make sure no other process adds more write requests while we try
1724 * our best to flush them, we make them sleep during the attribute refresh.
1725 *
1726 * A very similar scenario holds for the dir cache.
1727 */
24aa1fe6 1728static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1da177e4 1729{
8b4bdcf8 1730 struct nfs_server *server;
1da177e4 1731 struct nfs_inode *nfsi = NFS_I(inode);
951a143b 1732 loff_t cur_isize, new_isize;
2a3f5fd4 1733 unsigned long invalid = 0;
3e7d950a 1734 unsigned long now = jiffies;
62ab460c 1735 unsigned long save_cache_validity;
651b0e70 1736 bool have_writers = nfs_file_has_buffered_writers(nfsi);
944171cb 1737 bool cache_revalidated = true;
1da177e4 1738
1e8968c5 1739 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
3110ff80 1740 __func__, inode->i_sb->s_id, inode->i_ino,
4f1abd22 1741 nfs_display_fhandle_hash(NFS_FH(inode)),
1da177e4
LT		 1742 atomic_read(&inode->i_count), fattr->valid);
1743
ea96d1ec 1744 if (!nfs_fileid_valid(nfsi, fattr)) {
e73e6c9e
MT		 1745 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1746 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1747 NFS_SERVER(inode)->nfs_client->cl_hostname,
1748 inode->i_sb->s_id, (long long)nfsi->fileid,
1749 (long long)fattr->fileid);
1750 goto out_err;
1751 }
1da177e4
LT		 1752
1753 /*
1754 * Make sure the inode's type hasn't changed.
1755 */
e73e6c9e
MT		 1756 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1757 /*
1758 * Big trouble! The inode has become a different object.
1759 */
1e8968c5 1760 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
e73e6c9e
MT		 1761 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1762 goto out_err;
1763 }
1da177e4 1764
8b4bdcf8 1765 server = NFS_SERVER(inode);
a0356862 1766 /* Update the fsid? */
9e6e70f8 1767 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
c37dcd33 1768 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
36d43a43 1769 !IS_AUTOMOUNT(inode))
8b4bdcf8
TM		 1770 server->fsid = fattr->fsid;
1771
1da177e4
LT		 1772 /*
1773 * Update the read time so we don't revalidate too often.
1774 */
33801147 1775 nfsi->read_cache_jiffies = fattr->time_start;
3e7d950a 1776
62ab460c
TM		 1777 save_cache_validity = nfsi->cache_validity;
1778 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1779 | NFS_INO_INVALID_ATIME
1780 | NFS_INO_REVAL_FORCED
1781 | NFS_INO_REVAL_PAGECACHE);
1da177e4 1782
a895b4a1 1783 /* Do atomic weak cache consistency updates */
783b194c 1784 nfs_wcc_update_inode(inode, fattr);
a895b4a1 1785
944171cb
BC		 1786 if (pnfs_layoutcommit_outstanding(inode)) {
1787 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1788 cache_revalidated = false;
1789 }
10b7e9ad 1790
47aabaa7 1791 /* More cache consistency checks */
9e6e70f8 1792 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
c472c07b 1793 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
9e6e70f8
TM		 1794 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1795 inode->i_sb->s_id, inode->i_ino);
38512aa9 1796 /* Could it be a race with writeback? */
ca0daa27 1797 if (!have_writers) {
38512aa9
TM		 1798 invalid |= NFS_INO_INVALID_ATTR
1799 | NFS_INO_INVALID_DATA
1800 | NFS_INO_INVALID_ACCESS
1801 | NFS_INO_INVALID_ACL;
1802 if (S_ISDIR(inode->i_mode))
1803 nfs_force_lookup_revalidate(inode);
1804 }
1eb5d98f 1805 inode_set_iversion_raw(inode, fattr->change_attr);
9e6e70f8 1806 }
ade14a7d 1807 } else {
8619ddd0
TM		 1808 nfsi->cache_validity |= save_cache_validity &
1809 (NFS_INO_INVALID_ATTR
1810 | NFS_INO_REVAL_PAGECACHE
1811 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1812 cache_revalidated = false;
1813 }
9e6e70f8
TM		 1814
1815 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
fee7fe19 1816 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
ade14a7d 1817 } else if (server->caps & NFS_CAP_MTIME) {
43b6535e
TM		 1818 nfsi->cache_validity |= save_cache_validity &
1819 (NFS_INO_INVALID_ATTR
62ab460c 1820 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1821 cache_revalidated = false;
1822 }
62ab460c 1823
9e6e70f8 1824 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
fee7fe19 1825 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
ade14a7d 1826 } else if (server->caps & NFS_CAP_CTIME) {
43b6535e
TM		 1827 nfsi->cache_validity |= save_cache_validity &
1828 (NFS_INO_INVALID_ATTR
62ab460c 1829 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1830 cache_revalidated = false;
1831 }
47aabaa7 1832
951a143b 1833 /* Check if our cached file size is stale */
9e6e70f8
TM		 1834 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1835 new_isize = nfs_size_to_loff_t(fattr->size);
1836 cur_isize = i_size_read(inode);
1837 if (new_isize != cur_isize) {
1838 /* Do we perhaps have any outstanding writes, or has
1839 * the file grown beyond our last write? */
a6b6d5b8 1840 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
9e6e70f8 1841 i_size_write(inode, new_isize);
ca0daa27
TM		 1842 if (!have_writers)
1843 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
9e6e70f8 1844 }
60c16ea8
HJ		 1845 dprintk("NFS: isize change on server for file %s/%ld "
1846 "(%Ld to %Ld)\n",
1847 inode->i_sb->s_id,
1848 inode->i_ino,
1849 (long long)cur_isize,
1850 (long long)new_isize);
1da177e4 1851 }
ade14a7d 1852 } else {
43b6535e
TM		 1853 nfsi->cache_validity |= save_cache_validity &
1854 (NFS_INO_INVALID_ATTR
62ab460c
TM		 1855 | NFS_INO_REVAL_PAGECACHE
1856 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1857 cache_revalidated = false;
1858 }
1da177e4 1859
1da177e4 1860
9e6e70f8
TM		 1861 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1862 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
ade14a7d 1863 else if (server->caps & NFS_CAP_ATIME) {
43b6535e
TM		 1864 nfsi->cache_validity |= save_cache_validity &
1865 (NFS_INO_INVALID_ATIME
62ab460c 1866 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1867 cache_revalidated = false;
1868 }
1da177e4 1869
9e6e70f8
TM		 1870 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1871 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
9b4b3513
TM		 1872 umode_t newmode = inode->i_mode & S_IFMT;
1873 newmode |= fattr->mode & S_IALLUGO;
1874 inode->i_mode = newmode;
9e6e70f8 1875 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
9e6e70f8 1876 }
ade14a7d 1877 } else if (server->caps & NFS_CAP_MODE) {
43b6535e
TM		 1878 nfsi->cache_validity |= save_cache_validity &
1879 (NFS_INO_INVALID_ATTR
62ab460c
TM		 1880 | NFS_INO_INVALID_ACCESS
1881 | NFS_INO_INVALID_ACL
1882 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1883 cache_revalidated = false;
1884 }
62ab460c 1885
9e6e70f8 1886 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
9ff593c4 1887 if (!uid_eq(inode->i_uid, fattr->uid)) {
9e6e70f8
TM		 1888 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1889 inode->i_uid = fattr->uid;
1890 }
ade14a7d 1891 } else if (server->caps & NFS_CAP_OWNER) {
43b6535e
TM		 1892 nfsi->cache_validity |= save_cache_validity &
1893 (NFS_INO_INVALID_ATTR
62ab460c
TM		 1894 | NFS_INO_INVALID_ACCESS
1895 | NFS_INO_INVALID_ACL
1896 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1897 cache_revalidated = false;
1898 }
62ab460c 1899
9e6e70f8 1900 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
9ff593c4 1901 if (!gid_eq(inode->i_gid, fattr->gid)) {
9e6e70f8
TM		 1902 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1903 inode->i_gid = fattr->gid;
1904 }
ade14a7d 1905 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
43b6535e
TM		 1906 nfsi->cache_validity |= save_cache_validity &
1907 (NFS_INO_INVALID_ATTR
62ab460c
TM		 1908 | NFS_INO_INVALID_ACCESS
1909 | NFS_INO_INVALID_ACL
1910 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1911 cache_revalidated = false;
1912 }
921615f1 1913
9e6e70f8
TM		 1914 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1915 if (inode->i_nlink != fattr->nlink) {
1916 invalid |= NFS_INO_INVALID_ATTR;
1917 if (S_ISDIR(inode->i_mode))
1918 invalid |= NFS_INO_INVALID_DATA;
bfe86848 1919 set_nlink(inode, fattr->nlink);
9e6e70f8 1920 }
ade14a7d 1921 } else if (server->caps & NFS_CAP_NLINK) {
43b6535e
TM		 1922 nfsi->cache_validity |= save_cache_validity &
1923 (NFS_INO_INVALID_ATTR
62ab460c 1924 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1925 cache_revalidated = false;
1926 }
1da177e4 1927
9e6e70f8 1928 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 1929 /*
1930 * report the blocks in 512byte units
1931 */
1932 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
ade14a7d 1933 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
9e6e70f8 1934 inode->i_blocks = fattr->du.nfs2.blocks;
ade14a7d
TM		 1935 else
1936 cache_revalidated = false;
1da177e4
LT		 1937
1938 /* Update attrtimeo value if we're out of the unstable period */
fd1defc2 1939 if (invalid & NFS_INO_INVALID_ATTR) {
91d5b470 1940 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1da177e4 1941 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
3e7d950a 1942 nfsi->attrtimeo_timestamp = now;
f5062003 1943 /* Set barrier to be more recent than all outstanding updates */
4704f0e2 1944 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
6d2b2966 1945 } else {
ade14a7d
TM		 1946 if (cache_revalidated) {
1947 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
1948 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1949 nfsi->attrtimeo <<= 1;
1950 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
1951 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1952 }
6d2b2966
TM		 1953 nfsi->attrtimeo_timestamp = now;
1954 }
f5062003
TM		 1955 /* Set the barrier to be more recent than this fattr */
1956 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
1957 nfsi->attr_gencount = fattr->gencount;
1da177e4 1958 }
c812012f
JL		 1959
1960 /* Don't declare attrcache up to date if there were no attrs! */
ade14a7d 1961 if (cache_revalidated)
c812012f
JL		 1962 invalid &= ~NFS_INO_INVALID_ATTR;
1963
1da177e4
LT		 1964 /* Don't invalidate the data if we were to blame */
1965 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1966 || S_ISLNK(inode->i_mode)))
1967 invalid &= ~NFS_INO_INVALID_DATA;
011e2a7f 1968 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
62ab460c 1969 (save_cache_validity & NFS_INO_REVAL_FORCED))
6edf9609 1970 nfs_set_cache_invalid(inode, invalid);
de242c0b 1971
1da177e4 1972 return 0;
b37b03b7 1973 out_err:
1da177e4
LT		 1974 /*
1975 * No need to worry about unhashing the dentry, as the
1976 * lookup validation will know that the inode is bad.
1977 * (But we fall through to invalidate the caches.)
1978 */
1979 nfs_invalidate_inode(inode);
1da177e4
LT		 1980 return -ESTALE;
1981}
1982
f7b422b1 1983struct inode *nfs_alloc_inode(struct super_block *sb)
1da177e4
LT		 1984{
1985 struct nfs_inode *nfsi;
c456aacf 1986 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1da177e4
LT		 1987 if (!nfsi)
1988 return NULL;
55296809
CL		 1989 nfsi->flags = 0UL;
1990 nfsi->cache_validity = 0UL;
89d77c8f 1991#if IS_ENABLED(CONFIG_NFS_V4)
e50a1c2e
BF		 1992 nfsi->nfs4_acl = NULL;
1993#endif /* CONFIG_NFS_V4 */
1da177e4
LT		 1994 return &nfsi->vfs_inode;
1995}
89d77c8f 1996EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1da177e4 1997
fa0d7e3d 1998static void nfs_i_callback(struct rcu_head *head)
1da177e4 1999{
fa0d7e3d 2000 struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4
LT		 2001 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2002}
2003
fa0d7e3d
NP		 2004void nfs_destroy_inode(struct inode *inode)
2005{
2006 call_rcu(&inode->i_rcu, nfs_i_callback);
2007}
89d77c8f 2008EXPORT_SYMBOL_GPL(nfs_destroy_inode);
fa0d7e3d 2009
d75d5414
AM		 2010static inline void nfs4_init_once(struct nfs_inode *nfsi)
2011{
89d77c8f 2012#if IS_ENABLED(CONFIG_NFS_V4)
d75d5414
AM		 2013 INIT_LIST_HEAD(&nfsi->open_states);
2014 nfsi->delegation = NULL;
d75d5414 2015 init_rwsem(&nfsi->rwsem);
e5e94017 2016 nfsi->layout = NULL;
d75d5414
AM		 2017#endif
2018}
f7b422b1 2019
51cc5068 2020static void init_once(void *foo)
1da177e4
LT		 2021{
2022 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2023
a35afb83 2024 inode_init_once(&nfsi->vfs_inode);
a35afb83
CL		 2025 INIT_LIST_HEAD(&nfsi->open_files);
2026 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2027 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
ea2cf228 2028 INIT_LIST_HEAD(&nfsi->commit_info.list);
a6b6d5b8 2029 atomic_long_set(&nfsi->nrequests, 0);
5cb953d4 2030 atomic_long_set(&nfsi->commit_info.ncommit, 0);
1a0de48a 2031 atomic_set(&nfsi->commit_info.rpcs_out, 0);
884be175 2032 init_rwsem(&nfsi->rmdir_sem);
e824f99a 2033 mutex_init(&nfsi->commit_mutex);
a35afb83 2034 nfs4_init_once(nfsi);
1da177e4 2035}
20c2df83 2036
f7b422b1 2037static int __init nfs_init_inodecache(void)
1da177e4
LT		 2038{
2039 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2040 sizeof(struct nfs_inode),
fffb60f9 2041 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 2042 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 2043 init_once);
1da177e4
LT		 2044 if (nfs_inode_cachep == NULL)
2045 return -ENOMEM;
2046
2047 return 0;
2048}
2049
266bee88 2050static void nfs_destroy_inodecache(void)
1da177e4 2051{
8c0a8537
KS		 2052 /*
2053 * Make sure all delayed rcu free inodes are flushed before we
2054 * destroy cache.
2055 */
2056 rcu_barrier();
1a1d92c1 2057 kmem_cache_destroy(nfs_inode_cachep);
1da177e4
LT		 2058}
2059
5746006f 2060struct workqueue_struct *nfsiod_workqueue;
89d77c8f 2061EXPORT_SYMBOL_GPL(nfsiod_workqueue);
5746006f
TM		 2062
2063/*
2064 * start up the nfsiod workqueue
2065 */
2066static int nfsiod_start(void)
2067{
2068 struct workqueue_struct *wq;
2069 dprintk("RPC: creating workqueue nfsiod\n");
ada609ee 2070 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
5746006f
TM		 2071 if (wq == NULL)
2072 return -ENOMEM;
2073 nfsiod_workqueue = wq;
2074 return 0;
2075}
2076
2077/*
2078 * Destroy the nfsiod workqueue
2079 */
2080static void nfsiod_stop(void)
2081{
2082 struct workqueue_struct *wq;
2083
2084 wq = nfsiod_workqueue;
2085 if (wq == NULL)
2086 return;
2087 nfsiod_workqueue = NULL;
2088 destroy_workqueue(wq);
2089}
2090
c7d03a00 2091unsigned int nfs_net_id;
9e2e74db 2092EXPORT_SYMBOL_GPL(nfs_net_id);
1b340d01
SK		 2093
2094static int nfs_net_init(struct net *net)
2095{
6b13168b 2096 nfs_clients_init(net);
65b38851 2097 return nfs_fs_proc_net_init(net);
1b340d01
SK		 2098}
2099
2100static void nfs_net_exit(struct net *net)
2101{
b0b5352d
VA		 2102 struct nfs_net *nn = net_generic(net, nfs_net_id);
2103
65b38851 2104 nfs_fs_proc_net_exit(net);
28cd1b3f 2105 nfs_cleanup_cb_ident_idr(net);
b0b5352d
VA		 2106 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
2107 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
1b340d01
SK		 2108}
2109
2110static struct pernet_operations nfs_net_ops = {
2111 .init = nfs_net_init,
2112 .exit = nfs_net_exit,
2113 .id = &nfs_net_id,
2114 .size = sizeof(struct nfs_net),
2115};
2116
1da177e4
LT		 2117/*
2118 * Initialize NFS
2119 */
2120static int __init init_nfs_fs(void)
2121{
2122 int err;
2123
1b340d01 2124 err = register_pernet_subsys(&nfs_net_ops);
e571cbf1 2125 if (err < 0)
89d77c8f 2126 goto out9;
e571cbf1 2127
8ec442ae
DH		 2128 err = nfs_fscache_register();
2129 if (err < 0)
89d77c8f 2130 goto out8;
8ec442ae 2131
5746006f
TM		 2132 err = nfsiod_start();
2133 if (err)
89d77c8f 2134 goto out7;
5746006f 2135
6aaca566
DH		 2136 err = nfs_fs_proc_init();
2137 if (err)
89d77c8f 2138 goto out6;
6aaca566 2139
1da177e4
LT		 2140 err = nfs_init_nfspagecache();
2141 if (err)
89d77c8f 2142 goto out5;
1da177e4
LT		 2143
2144 err = nfs_init_inodecache();
2145 if (err)
89d77c8f 2146 goto out4;
1da177e4
LT		 2147
2148 err = nfs_init_readpagecache();
2149 if (err)
89d77c8f 2150 goto out3;
1da177e4
LT		 2151
2152 err = nfs_init_writepagecache();
2153 if (err)
89d77c8f 2154 goto out2;
1da177e4 2155
1da177e4
LT		 2156 err = nfs_init_directcache();
2157 if (err)
89d77c8f 2158 goto out1;
1da177e4 2159
ec7652aa 2160 rpc_proc_register(&init_net, &nfs_rpcstat);
cd738ee9
KM		 2161
2162 err = register_nfs_fs();
2163 if (err)
129d1977
BS		 2164 goto out0;
2165
1da177e4 2166 return 0;
129d1977 2167out0:
ec7652aa 2168 rpc_proc_unregister(&init_net, "nfs");
1da177e4 2169 nfs_destroy_directcache();
89d77c8f 2170out1:
129d1977 2171 nfs_destroy_writepagecache();
89d77c8f 2172out2:
129d1977 2173 nfs_destroy_readpagecache();
89d77c8f 2174out3:
129d1977 2175 nfs_destroy_inodecache();
89d77c8f 2176out4:
129d1977 2177 nfs_destroy_nfspagecache();
89d77c8f 2178out5:
129d1977 2179 nfs_fs_proc_exit();
89d77c8f 2180out6:
129d1977 2181 nfsiod_stop();
89d77c8f 2182out7:
129d1977 2183 nfs_fscache_unregister();
89d77c8f 2184out8:
129d1977 2185 unregister_pernet_subsys(&nfs_net_ops);
89d77c8f 2186out9:
1da177e4
LT		 2187 return err;
2188}
2189
2190static void __exit exit_nfs_fs(void)
2191{
1da177e4 2192 nfs_destroy_directcache();
1da177e4
LT		 2193 nfs_destroy_writepagecache();
2194 nfs_destroy_readpagecache();
2195 nfs_destroy_inodecache();
2196 nfs_destroy_nfspagecache();
8ec442ae 2197 nfs_fscache_unregister();
1b340d01 2198 unregister_pernet_subsys(&nfs_net_ops);
ec7652aa 2199 rpc_proc_unregister(&init_net, "nfs");
f7b422b1 2200 unregister_nfs_fs();
6aaca566 2201 nfs_fs_proc_exit();
5746006f 2202 nfsiod_stop();
1da177e4
LT		 2203}
2204
2205/* Not quite true; I just maintain it */
2206MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2207MODULE_LICENSE("GPL");
f43bf0be 2208module_param(enable_ino64, bool, 0644);
1da177e4
LT		 2209
2210module_init(init_nfs_fs)
2211module_exit(exit_nfs_fs)
Linux 6.x block layer and io_uring tree(s)