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Merge branch 'rebased-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[mirror_ubuntu-artful-kernel.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>
1da177e4 41
7c0f6ba6 42#include <linux/uaccess.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
210c7c17
BC		 88int nfs_wait_atomic_killable(atomic_t *p)
89{
90 return nfs_wait_killable(TASK_KILLABLE);
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
1da177e4
LT		 389/*
390 * This is our front-end to iget that looks up inodes by file handle
391 * instead of inode number.
392 */
393struct inode *
1775fd3e 394nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
1da177e4
LT		 395{
396 struct nfs_find_desc desc = {
397 .fh = fh,
398 .fattr = fattr
399 };
03f28e3a 400 struct inode *inode = ERR_PTR(-ENOENT);
1da177e4
LT		 401 unsigned long hash;
402
7ebb9315
BS		 403 nfs_attr_check_mountpoint(sb, fattr);
404
2ef47eb1
AS		 405 if (nfs_attr_use_mounted_on_fileid(fattr))
406 fattr->fileid = fattr->mounted_on_fileid;
407 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
1da177e4 408 goto out_no_inode;
9e6e70f8 409 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
1da177e4 410 goto out_no_inode;
1da177e4
LT		 411
412 hash = nfs_fattr_to_ino_t(fattr);
413
03f28e3a
TM		 414 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
415 if (inode == NULL) {
416 inode = ERR_PTR(-ENOMEM);
1da177e4 417 goto out_no_inode;
03f28e3a 418 }
1da177e4
LT		 419
420 if (inode->i_state & I_NEW) {
421 struct nfs_inode *nfsi = NFS_I(inode);
b0c4fddc 422 unsigned long now = jiffies;
1da177e4
LT		 423
424 /* We set i_ino for the few things that still rely on it,
425 * such as stat(2) */
426 inode->i_ino = hash;
427
428 /* We can't support update_atime(), since the server will reset it */
429 inode->i_flags |= S_NOATIME|S_NOCMTIME;
430 inode->i_mode = fattr->mode;
62ab460c
TM		 431 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
432 && nfs_server_capable(inode, NFS_CAP_MODE))
6edf9609 433 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
1da177e4
LT		 434 /* Why so? Because we want revalidate for devices/FIFOs, and
435 * that's precisely what we have in nfs_file_inode_operations.
436 */
8fa5c000 437 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
1da177e4 438 if (S_ISREG(inode->i_mode)) {
1788ea6e 439 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
1da177e4 440 inode->i_data.a_ops = &nfs_file_aops;
1da177e4 441 } else if (S_ISDIR(inode->i_mode)) {
8fa5c000 442 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
1da177e4 443 inode->i_fop = &nfs_dir_operations;
11de3b11 444 inode->i_data.a_ops = &nfs_dir_aops;
55a97593 445 /* Deal with crossing mountpoints */
7ebb9315
BS		 446 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
447 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
6b97fd3d
MN		 448 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
449 inode->i_op = &nfs_referral_inode_operations;
450 else
451 inode->i_op = &nfs_mountpoint_inode_operations;
55a97593 452 inode->i_fop = NULL;
36d43a43 453 inode->i_flags |= S_AUTOMOUNT;
55a97593 454 }
21fc61c7 455 } else if (S_ISLNK(inode->i_mode)) {
1da177e4 456 inode->i_op = &nfs_symlink_inode_operations;
21fc61c7
AV		 457 inode_nohighmem(inode);
458 } else
1da177e4
LT		 459 init_special_inode(inode, inode->i_mode, fattr->rdev);
460
9e6e70f8
TM		 461 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
462 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
463 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
a9a4a87a 464 inode->i_version = 0;
9e6e70f8 465 inode->i_size = 0;
6d6b77f1 466 clear_nlink(inode);
9ff593c4
EB		 467 inode->i_uid = make_kuid(&init_user_ns, -2);
468 inode->i_gid = make_kgid(&init_user_ns, -2);
9e6e70f8
TM		 469 inode->i_blocks = 0;
470 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
2701d086
AA		 471 nfsi->write_io = 0;
472 nfsi->read_io = 0;
9e6e70f8 473
33801147 474 nfsi->read_cache_jiffies = fattr->time_start;
4704f0e2 475 nfsi->attr_gencount = fattr->gencount;
9e6e70f8
TM		 476 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
477 inode->i_atime = fattr->atime;
62ab460c 478 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
6edf9609 479 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
9e6e70f8
TM		 480 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
481 inode->i_mtime = fattr->mtime;
62ab460c 482 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
6edf9609 483 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
9e6e70f8
TM		 484 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
485 inode->i_ctime = fattr->ctime;
62ab460c 486 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
6edf9609 487 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
9e6e70f8 488 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
a9a4a87a 489 inode->i_version = fattr->change_attr;
cd812599 490 else
5c675d64
TM		 491 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
492 | NFS_INO_REVAL_PAGECACHE);
9e6e70f8
TM		 493 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
494 inode->i_size = nfs_size_to_loff_t(fattr->size);
62ab460c 495 else
6edf9609
TM		 496 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
497 | NFS_INO_REVAL_PAGECACHE);
9e6e70f8 498 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
bfe86848 499 set_nlink(inode, fattr->nlink);
62ab460c 500 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
6edf9609 501 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
9e6e70f8
TM		 502 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
503 inode->i_uid = fattr->uid;
62ab460c 504 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
6edf9609 505 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
9e6e70f8
TM		 506 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
507 inode->i_gid = fattr->gid;
62ab460c 508 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
6edf9609 509 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
9e6e70f8
TM		 510 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
511 inode->i_blocks = fattr->du.nfs2.blocks;
512 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 513 /*
514 * report the blocks in 512byte units
515 */
516 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1da177e4 517 }
aa9c2669
DQ		 518
519 nfs_setsecurity(inode, fattr, label);
520
1da177e4 521 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
b0c4fddc 522 nfsi->attrtimeo_timestamp = now;
1c3c07e9 523 nfsi->access_cache = RB_ROOT;
1da177e4 524
f1fe29b4 525 nfs_fscache_init_inode(inode);
ef79c097 526
1da177e4
LT		 527 unlock_new_inode(inode);
528 } else
529 nfs_refresh_inode(inode, fattr);
1e8968c5 530 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
1da177e4 531 inode->i_sb->s_id,
1e8968c5 532 (unsigned long long)NFS_FILEID(inode),
4f1abd22 533 nfs_display_fhandle_hash(fh),
1da177e4
LT		 534 atomic_read(&inode->i_count));
535
536out:
537 return inode;
538
539out_no_inode:
03f28e3a 540 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
1da177e4
LT		 541 goto out;
542}
89d77c8f 543EXPORT_SYMBOL_GPL(nfs_fhget);
1da177e4 544
536e43d1 545#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		 546
547int
548nfs_setattr(struct dentry *dentry, struct iattr *attr)
549{
2b0143b5 550 struct inode *inode = d_inode(dentry);
987f8dfc 551 struct nfs_fattr *fattr;
ae57ca0f 552 int error = 0;
1da177e4 553
91d5b470
CL		 554 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
555
188b95dd
JL		 556 /* skip mode change if it's just for clearing setuid/setgid */
557 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
558 attr->ia_valid &= ~ATTR_MODE;
559
1da177e4 560 if (attr->ia_valid & ATTR_SIZE) {
08a899d5
CH		 561 BUG_ON(!S_ISREG(inode->i_mode));
562
ae57ca0f
KM		 563 error = inode_newsize_ok(inode, attr->ia_size);
564 if (error)
565 return error;
566
567 if (attr->ia_size == i_size_read(inode))
1da177e4
LT		 568 attr->ia_valid &= ~ATTR_SIZE;
569 }
570
571 /* Optimization: if the end result is no change, don't RPC */
572 attr->ia_valid &= NFS_VALID_ATTRS;
536e43d1 573 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
1da177e4
LT		 574 return 0;
575
f4ce1299
TM		 576 trace_nfs_setattr_enter(inode);
577
755c1e20 578 /* Write all dirty data */
4d346bea
TM		 579 if (S_ISREG(inode->i_mode))
580 nfs_sync_inode(inode);
987f8dfc
TM		 581
582 fattr = nfs_alloc_fattr();
ae57ca0f
KM		 583 if (fattr == NULL) {
584 error = -ENOMEM;
987f8dfc 585 goto out;
ae57ca0f
KM		 586 }
587
642ac549
TM		 588 /*
589 * Return any delegations if we're going to change ACLs
590 */
591 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
57ec14c5 592 NFS_PROTO(inode)->return_delegation(inode);
987f8dfc 593 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
65e4308d 594 if (error == 0)
aa9c2669 595 error = nfs_refresh_inode(inode, fattr);
987f8dfc
TM		 596 nfs_free_fattr(fattr);
597out:
f4ce1299 598 trace_nfs_setattr_exit(inode, error);
65e4308d
TM		 599 return error;
600}
ddda8e0a 601EXPORT_SYMBOL_GPL(nfs_setattr);
65e4308d 602
a3d01454
TM		 603/**
604 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
605 * @inode: inode of the file used
606 * @offset: file offset to start truncating
607 *
608 * This is a copy of the common vmtruncate, but with the locking
609 * corrected to take into account the fact that NFS requires
610 * inode->i_size to be updated under the inode->i_lock.
f044636d 611 * Note: must be called with inode->i_lock held!
a3d01454
TM		 612 */
613static int nfs_vmtruncate(struct inode * inode, loff_t offset)
614{
c08d3b0e 615 int err;
a3d01454 616
c08d3b0e 617 err = inode_newsize_ok(inode, offset);
618 if (err)
619 goto out;
a3d01454 620
c08d3b0e 621 i_size_write(inode, offset);
6edf9609
TM		 622 /* Optimisation */
623 if (offset == 0)
624 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
c08d3b0e 625
f044636d 626 spin_unlock(&inode->i_lock);
7caef267 627 truncate_pagecache(inode, offset);
f044636d 628 spin_lock(&inode->i_lock);
c08d3b0e 629out:
630 return err;
a3d01454
TM		 631}
632
65e4308d
TM		 633/**
634 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
635 * @inode: pointer to struct inode
636 * @attr: pointer to struct iattr
637 *
638 * Note: we do this in the *proc.c in order to ensure that
639 * it works for things like exclusive creates too.
640 */
f044636d
TM		 641void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
642 struct nfs_fattr *fattr)
65e4308d 643{
f044636d
TM		 644 /* Barrier: bump the attribute generation count. */
645 nfs_fattr_set_barrier(fattr);
646
647 spin_lock(&inode->i_lock);
648 NFS_I(inode)->attr_gencount = fattr->gencount;
65e4308d 649 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
1da177e4 650 if ((attr->ia_valid & ATTR_MODE) != 0) {
65e4308d
TM		 651 int mode = attr->ia_mode & S_IALLUGO;
652 mode |= inode->i_mode & ~S_IALLUGO;
1da177e4
LT		 653 inode->i_mode = mode;
654 }
655 if ((attr->ia_valid & ATTR_UID) != 0)
656 inode->i_uid = attr->ia_uid;
657 if ((attr->ia_valid & ATTR_GID) != 0)
658 inode->i_gid = attr->ia_gid;
6edf9609
TM		 659 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
660 | NFS_INO_INVALID_ACL);
65e4308d
TM		 661 }
662 if ((attr->ia_valid & ATTR_SIZE) != 0) {
91d5b470 663 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
a3d01454 664 nfs_vmtruncate(inode, attr->ia_size);
65e4308d 665 }
616c3196
JL		 666 if (fattr->valid)
667 nfs_update_inode(inode, fattr);
668 else
669 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
f044636d 670 spin_unlock(&inode->i_lock);
1da177e4 671}
ddda8e0a 672EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
1da177e4 673
1bcf4c5c 674static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
311324ad
TM		 675{
676 struct dentry *parent;
677
1bcf4c5c
TM		 678 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
679 return;
311324ad 680 parent = dget_parent(dentry);
2b0143b5 681 nfs_force_use_readdirplus(d_inode(parent));
311324ad
TM		 682 dput(parent);
683}
684
1bcf4c5c
TM		 685static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
686{
687 struct dentry *parent;
688
689 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
690 return;
691 parent = dget_parent(dentry);
692 nfs_advise_use_readdirplus(d_inode(parent));
693 dput(parent);
694}
695
311324ad
TM		 696static bool nfs_need_revalidate_inode(struct inode *inode)
697{
698 if (NFS_I(inode)->cache_validity &
699 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
700 return true;
701 if (nfs_attribute_cache_expired(inode))
702 return true;
703 return false;
704}
705
a528d35e
DH		 706int nfs_getattr(const struct path *path, struct kstat *stat,
707 u32 request_mask, unsigned int query_flags)
1da177e4 708{
a528d35e 709 struct inode *inode = d_inode(path->dentry);
55296809 710 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
16caf5b6 711 int err = 0;
1da177e4 712
f4ce1299 713 trace_nfs_getattr_enter(inode);
acdc53b2 714 /* Flush out writes to the server in order to update c/mtime. */
28c494c5 715 if (S_ISREG(inode->i_mode)) {
79566ef0 716 err = filemap_write_and_wait(inode->i_mapping);
acdc53b2
TM		 717 if (err)
718 goto out;
28c494c5 719 }
fc33a7bb
CH		 720
721 /*
722 * We may force a getattr if the user cares about atime.
723 *
724 * Note that we only have to check the vfsmount flags here:
725 * - NFS always sets S_NOATIME by so checking it would give a
726 * bogus result
727 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
728 * no point in checking those.
729 */
a528d35e
DH		 730 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
731 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
1da177e4 732 need_atime = 0;
fc33a7bb 733
311324ad
TM		 734 if (need_atime || nfs_need_revalidate_inode(inode)) {
735 struct nfs_server *server = NFS_SERVER(inode);
736
a528d35e 737 nfs_readdirplus_parent_cache_miss(path->dentry);
311324ad 738 err = __nfs_revalidate_inode(server, inode);
1bcf4c5c 739 } else
a528d35e 740 nfs_readdirplus_parent_cache_hit(path->dentry);
4e769b93 741 if (!err) {
1da177e4 742 generic_fillattr(inode, stat);
f43bf0be 743 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
7ef5ca4f
N		 744 if (S_ISDIR(inode->i_mode))
745 stat->blksize = NFS_SERVER(inode)->dtsize;
4e769b93 746 }
acdc53b2 747out:
f4ce1299 748 trace_nfs_getattr_exit(inode, err);
1da177e4
LT		 749 return err;
750}
ddda8e0a 751EXPORT_SYMBOL_GPL(nfs_getattr);
1da177e4 752
f11ac8db
TM		 753static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
754{
755 atomic_set(&l_ctx->count, 1);
d51fdb87 756 l_ctx->lockowner = current->files;
f11ac8db 757 INIT_LIST_HEAD(&l_ctx->list);
210c7c17 758 atomic_set(&l_ctx->io_count, 0);
f11ac8db
TM		 759}
760
761static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
762{
8c86899f
TM		 763 struct nfs_lock_context *head = &ctx->lock_context;
764 struct nfs_lock_context *pos = head;
f11ac8db 765
8c86899f 766 do {
d51fdb87 767 if (pos->lockowner != current->files)
f11ac8db
TM		 768 continue;
769 atomic_inc(&pos->count);
770 return pos;
8c86899f 771 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
f11ac8db
TM		 772 return NULL;
773}
774
775struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
776{
777 struct nfs_lock_context *res, *new = NULL;
2b0143b5 778 struct inode *inode = d_inode(ctx->dentry);
f11ac8db
TM		 779
780 spin_lock(&inode->i_lock);
781 res = __nfs_find_lock_context(ctx);
782 if (res == NULL) {
783 spin_unlock(&inode->i_lock);
784 new = kmalloc(sizeof(*new), GFP_KERNEL);
785 if (new == NULL)
b3c54de6 786 return ERR_PTR(-ENOMEM);
f11ac8db
TM		 787 nfs_init_lock_context(new);
788 spin_lock(&inode->i_lock);
789 res = __nfs_find_lock_context(ctx);
790 if (res == NULL) {
791 list_add_tail(&new->list, &ctx->lock_context.list);
792 new->open_context = ctx;
793 res = new;
794 new = NULL;
795 }
796 }
797 spin_unlock(&inode->i_lock);
798 kfree(new);
799 return res;
800}
1c6dcbe5 801EXPORT_SYMBOL_GPL(nfs_get_lock_context);
f11ac8db
TM		 802
803void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
804{
805 struct nfs_open_context *ctx = l_ctx->open_context;
2b0143b5 806 struct inode *inode = d_inode(ctx->dentry);
f11ac8db
TM		 807
808 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
809 return;
810 list_del(&l_ctx->list);
811 spin_unlock(&inode->i_lock);
812 kfree(l_ctx);
813}
1c6dcbe5 814EXPORT_SYMBOL_GPL(nfs_put_lock_context);
f11ac8db 815
7fe5c398
TM		 816/**
817 * nfs_close_context - Common close_context() routine NFSv2/v3
818 * @ctx: pointer to context
819 * @is_sync: is this a synchronous close
820 *
5cf9d706
TM		 821 * Ensure that the attributes are up to date if we're mounted
822 * with close-to-open semantics and we have cached data that will
823 * need to be revalidated on open.
7fe5c398
TM		 824 */
825void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
826{
5cf9d706 827 struct nfs_inode *nfsi;
7fe5c398
TM		 828 struct inode *inode;
829 struct nfs_server *server;
830
831 if (!(ctx->mode & FMODE_WRITE))
832 return;
833 if (!is_sync)
834 return;
2b0143b5 835 inode = d_inode(ctx->dentry);
58ff4184
TM		 836 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
837 return;
5cf9d706
TM		 838 nfsi = NFS_I(inode);
839 if (inode->i_mapping->nrpages == 0)
840 return;
841 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
842 return;
843 if (!list_empty(&nfsi->open_files))
7fe5c398
TM		 844 return;
845 server = NFS_SERVER(inode);
846 if (server->flags & NFS_MOUNT_NOCTO)
847 return;
848 nfs_revalidate_inode(server, inode);
849}
ddda8e0a 850EXPORT_SYMBOL_GPL(nfs_close_context);
7fe5c398 851
532d4def
N		 852struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
853 fmode_t f_mode,
854 struct file *filp)
1da177e4
LT		 855{
856 struct nfs_open_context *ctx;
5ede7b1c
AV		 857 struct rpc_cred *cred = rpc_lookup_cred();
858 if (IS_ERR(cred))
859 return ERR_CAST(cred);
1da177e4 860
f52720ca 861 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
5ede7b1c
AV		 862 if (!ctx) {
863 put_rpccred(cred);
864 return ERR_PTR(-ENOMEM);
1da177e4 865 }
5ede7b1c
AV		 866 nfs_sb_active(dentry->d_sb);
867 ctx->dentry = dget(dentry);
868 ctx->cred = cred;
869 ctx->state = NULL;
870 ctx->mode = f_mode;
871 ctx->flags = 0;
872 ctx->error = 0;
532d4def 873 ctx->flock_owner = (fl_owner_t)filp;
5ede7b1c
AV		 874 nfs_init_lock_context(&ctx->lock_context);
875 ctx->lock_context.open_context = ctx;
876 INIT_LIST_HEAD(&ctx->list);
82be417a 877 ctx->mdsthreshold = NULL;
1da177e4
LT		 878 return ctx;
879}
89d77c8f 880EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1da177e4
LT		 881
882struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
883{
884 if (ctx != NULL)
f11ac8db 885 atomic_inc(&ctx->lock_context.count);
1da177e4
LT		 886 return ctx;
887}
89d77c8f 888EXPORT_SYMBOL_GPL(get_nfs_open_context);
1da177e4 889
7fe5c398 890static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1da177e4 891{
2b0143b5 892 struct inode *inode = d_inode(ctx->dentry);
3d4ff43d 893 struct super_block *sb = ctx->dentry->d_sb;
3bec63db 894
5c78f58e 895 if (!list_empty(&ctx->list)) {
ef84303e
BH		 896 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
897 return;
898 list_del(&ctx->list);
899 spin_unlock(&inode->i_lock);
ef84303e 900 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
5e11934d 901 return;
5c78f58e
TM		 902 if (inode != NULL)
903 NFS_PROTO(inode)->close_context(ctx, is_sync);
3bec63db
TM		 904 if (ctx->cred != NULL)
905 put_rpccred(ctx->cred);
3d4ff43d 906 dput(ctx->dentry);
322b2b90 907 nfs_sb_deactive(sb);
82be417a 908 kfree(ctx->mdsthreshold);
3bec63db
TM		 909 kfree(ctx);
910}
911
a49c3c77
TM		 912void put_nfs_open_context(struct nfs_open_context *ctx)
913{
914 __put_nfs_open_context(ctx, 0);
915}
89d77c8f 916EXPORT_SYMBOL_GPL(put_nfs_open_context);
a49c3c77 917
4eae5014
TM		 918static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
919{
920 __put_nfs_open_context(ctx, 1);
921}
922
1da177e4
LT		 923/*
924 * Ensure that mmap has a recent RPC credential for use when writing out
925 * shared pages
926 */
c45ffdd2 927void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1da177e4 928{
2b0143b5 929 struct inode *inode = d_inode(ctx->dentry);
1da177e4
LT		 930 struct nfs_inode *nfsi = NFS_I(inode);
931
1da177e4 932 spin_lock(&inode->i_lock);
ca0daa27
TM		 933 if (ctx->mode & FMODE_WRITE)
934 list_add(&ctx->list, &nfsi->open_files);
935 else
936 list_add_tail(&ctx->list, &nfsi->open_files);
1da177e4
LT		 937 spin_unlock(&inode->i_lock);
938}
c45ffdd2
TM		 939EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
940
941void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
942{
943 filp->private_data = get_nfs_open_context(ctx);
944 if (list_empty(&ctx->list))
945 nfs_inode_attach_open_context(ctx);
946}
89d77c8f 947EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1da177e4 948
d530838b
TM		 949/*
950 * Given an inode, search for an open context with the desired characteristics
951 */
dc0b027d 952struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
1da177e4
LT		 953{
954 struct nfs_inode *nfsi = NFS_I(inode);
955 struct nfs_open_context *pos, *ctx = NULL;
956
957 spin_lock(&inode->i_lock);
958 list_for_each_entry(pos, &nfsi->open_files, list) {
d530838b
TM		 959 if (cred != NULL && pos->cred != cred)
960 continue;
1544fa0f
TM		 961 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
962 continue;
963 ctx = get_nfs_open_context(pos);
964 break;
1da177e4
LT		 965 }
966 spin_unlock(&inode->i_lock);
967 return ctx;
968}
969
aff8d8dc 970void nfs_file_clear_open_context(struct file *filp)
1da177e4 971{
cd3758e3 972 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1da177e4
LT		 973
974 if (ctx) {
2b0143b5 975 struct inode *inode = d_inode(ctx->dentry);
c45ffdd2 976
0bcbf039
PT		 977 /*
978 * We fatal error on write before. Try to writeback
979 * every page again.
980 */
981 if (ctx->error < 0)
982 invalidate_inode_pages2(inode->i_mapping);
1da177e4
LT		 983 filp->private_data = NULL;
984 spin_lock(&inode->i_lock);
985 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
986 spin_unlock(&inode->i_lock);
4eae5014 987 put_nfs_open_context_sync(ctx);
1da177e4
LT		 988 }
989}
990
991/*
992 * These allocate and release file read/write context information.
993 */
994int nfs_open(struct inode *inode, struct file *filp)
995{
996 struct nfs_open_context *ctx;
1da177e4 997
532d4def 998 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
5ede7b1c
AV		 999 if (IS_ERR(ctx))
1000 return PTR_ERR(ctx);
1da177e4
LT		 1001 nfs_file_set_open_context(filp, ctx);
1002 put_nfs_open_context(ctx);
f1fe29b4 1003 nfs_fscache_open_file(inode, filp);
1da177e4
LT		 1004 return 0;
1005}
1006
1da177e4
LT		 1007/*
1008 * This function is called whenever some part of NFS notices that
1009 * the cached attributes have to be refreshed.
1010 */
1011int
1012__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1013{
1014 int status = -ESTALE;
1775fd3e 1015 struct nfs4_label *label = NULL;
a3cba2aa 1016 struct nfs_fattr *fattr = NULL;
1da177e4 1017 struct nfs_inode *nfsi = NFS_I(inode);
1da177e4 1018
1e8968c5
NV		 1019 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1020 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1da177e4 1021
f4ce1299
TM		 1022 trace_nfs_revalidate_inode_enter(inode);
1023
85233a7a 1024 if (is_bad_inode(inode))
691beb13 1025 goto out;
1da177e4 1026 if (NFS_STALE(inode))
412d582e 1027 goto out;
7fdc49c4 1028
ac46bd37
TM		 1029 /* pNFS: Attributes aren't updated until we layoutcommit */
1030 if (S_ISREG(inode->i_mode)) {
1031 status = pnfs_sync_inode(inode, false);
1032 if (status)
1033 goto out;
1034 }
1035
a3cba2aa
TM		 1036 status = -ENOMEM;
1037 fattr = nfs_alloc_fattr();
1038 if (fattr == NULL)
1039 goto out;
1040
691beb13 1041 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
14c43f76
DQ		 1042
1043 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1044 if (IS_ERR(label)) {
1045 status = PTR_ERR(label);
1046 goto out;
1047 }
1048
1775fd3e 1049 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
1da177e4 1050 if (status != 0) {
1e8968c5 1051 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1da177e4 1052 inode->i_sb->s_id,
1e8968c5 1053 (unsigned long long)NFS_FILEID(inode), status);
1da177e4
LT		 1054 if (status == -ESTALE) {
1055 nfs_zap_caches(inode);
1056 if (!S_ISDIR(inode->i_mode))
3a10c30a 1057 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1da177e4 1058 }
14c43f76 1059 goto err_out;
1da177e4
LT		 1060 }
1061
a3cba2aa 1062 status = nfs_refresh_inode(inode, fattr);
1da177e4 1063 if (status) {
1e8968c5 1064 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1da177e4 1065 inode->i_sb->s_id,
1e8968c5 1066 (unsigned long long)NFS_FILEID(inode), status);
14c43f76 1067 goto err_out;
1da177e4 1068 }
55296809 1069
24aa1fe6 1070 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
ada70d94 1071 nfs_zap_acl_cache(inode);
55296809 1072
3da580aa
JL		 1073 nfs_setsecurity(inode, fattr, label);
1074
1e8968c5 1075 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1da177e4 1076 inode->i_sb->s_id,
1e8968c5 1077 (unsigned long long)NFS_FILEID(inode));
1da177e4 1078
14c43f76
DQ		 1079err_out:
1080 nfs4_label_free(label);
1081out:
a3cba2aa 1082 nfs_free_fattr(fattr);
f4ce1299 1083 trace_nfs_revalidate_inode_exit(inode, status);
1da177e4
LT		 1084 return status;
1085}
1086
43f291cd 1087int nfs_attribute_cache_expired(struct inode *inode)
d7cf8dd0 1088{
b4d2314b 1089 if (nfs_have_delegated_attributes(inode))
1da177e4 1090 return 0;
d7cf8dd0 1091 return nfs_attribute_timeout(inode);
1da177e4
LT		 1092}
1093
1094/**
1095 * nfs_revalidate_inode - Revalidate the inode attributes
1096 * @server - pointer to nfs_server struct
1097 * @inode - pointer to inode struct
1098 *
1099 * Updates inode attribute information by retrieving the data from the server.
1100 */
1101int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1102{
311324ad 1103 if (!nfs_need_revalidate_inode(inode))
1da177e4
LT		 1104 return NFS_STALE(inode) ? -ESTALE : 0;
1105 return __nfs_revalidate_inode(server, inode);
1106}
1c606fb7 1107EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1da177e4 1108
1cda707d 1109static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
717d44e8
TM		 1110{
1111 struct nfs_inode *nfsi = NFS_I(inode);
f8806c84
TM		 1112 int ret;
1113
717d44e8 1114 if (mapping->nrpages != 0) {
f8806c84 1115 if (S_ISREG(inode->i_mode)) {
ef070dcb 1116 unmap_mapping_range(mapping, 0, 0, 0);
f8806c84
TM		 1117 ret = nfs_sync_mapping(mapping);
1118 if (ret < 0)
1119 return ret;
1120 }
1121 ret = invalidate_inode_pages2(mapping);
717d44e8
TM		 1122 if (ret < 0)
1123 return ret;
1124 }
d529ef83
JL		 1125 if (S_ISDIR(inode->i_mode)) {
1126 spin_lock(&inode->i_lock);
717d44e8 1127 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
d529ef83
JL		 1128 spin_unlock(&inode->i_lock);
1129 }
717d44e8 1130 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
de242c0b 1131 nfs_fscache_wait_on_invalidate(inode);
f4ce1299 1132
1e8968c5
NV		 1133 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1134 inode->i_sb->s_id,
1135 (unsigned long long)NFS_FILEID(inode));
717d44e8
TM		 1136 return 0;
1137}
1138
1cd9cb05 1139bool nfs_mapping_need_revalidate_inode(struct inode *inode)
b4b1eadf 1140{
61540bf6
TM		 1141 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1142 NFS_STALE(inode);
b4b1eadf
TM		 1143}
1144
0d0def49
AV		 1145int nfs_revalidate_mapping_rcu(struct inode *inode)
1146{
1147 struct nfs_inode *nfsi = NFS_I(inode);
1148 unsigned long *bitlock = &nfsi->flags;
1149 int ret = 0;
1150
1151 if (IS_SWAPFILE(inode))
1152 goto out;
1153 if (nfs_mapping_need_revalidate_inode(inode)) {
1154 ret = -ECHILD;
1155 goto out;
1156 }
1157 spin_lock(&inode->i_lock);
1158 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1159 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1160 ret = -ECHILD;
1161 spin_unlock(&inode->i_lock);
1162out:
1163 return ret;
1164}
1165
717d44e8 1166/**
be527494 1167 * nfs_revalidate_mapping - Revalidate the pagecache
717d44e8
TM		 1168 * @inode - pointer to host inode
1169 * @mapping - pointer to mapping
717d44e8 1170 */
be527494
TM		 1171int nfs_revalidate_mapping(struct inode *inode,
1172 struct address_space *mapping)
717d44e8
TM		 1173{
1174 struct nfs_inode *nfsi = NFS_I(inode);
d529ef83 1175 unsigned long *bitlock = &nfsi->flags;
717d44e8 1176 int ret = 0;
dc59250c 1177
29418aa4
MG		 1178 /* swapfiles are not supposed to be shared. */
1179 if (IS_SWAPFILE(inode))
1180 goto out;
1181
b4b1eadf 1182 if (nfs_mapping_need_revalidate_inode(inode)) {
717d44e8
TM		 1183 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1184 if (ret < 0)
1185 goto out;
7d52e862 1186 }
d529ef83
JL		 1187
1188 /*
1189 * We must clear NFS_INO_INVALID_DATA first to ensure that
1190 * invalidations that come in while we're shooting down the mappings
1191 * are respected. But, that leaves a race window where one revalidator
1192 * can clear the flag, and then another checks it before the mapping
1193 * gets invalidated. Fix that by serializing access to this part of
1194 * the function.
1195 *
1196 * At the same time, we need to allow other tasks to see whether we
1197 * might be in the middle of invalidating the pages, so we only set
1198 * the bit lock here if it looks like we're going to be doing that.
1199 */
1200 for (;;) {
74316201
N		 1201 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1202 nfs_wait_bit_killable, TASK_KILLABLE);
d529ef83
JL		 1203 if (ret)
1204 goto out;
17dfeb91
TM		 1205 spin_lock(&inode->i_lock);
1206 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1207 spin_unlock(&inode->i_lock);
1208 continue;
1209 }
1210 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
d529ef83 1211 break;
d529ef83 1212 spin_unlock(&inode->i_lock);
17dfeb91 1213 goto out;
f4ce1299
TM		 1214 }
1215
17dfeb91 1216 set_bit(NFS_INO_INVALIDATING, bitlock);
4db72b40 1217 smp_wmb();
17dfeb91
TM		 1218 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1219 spin_unlock(&inode->i_lock);
1220 trace_nfs_invalidate_mapping_enter(inode);
be527494 1221 ret = nfs_invalidate_mapping(inode, mapping);
17dfeb91
TM		 1222 trace_nfs_invalidate_mapping_exit(inode, ret);
1223
d529ef83 1224 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
4e857c58 1225 smp_mb__after_atomic();
d529ef83 1226 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
cd9ae2b6 1227out:
44b11874 1228 return ret;
7d52e862
TM		 1229}
1230
ca0daa27 1231static bool nfs_file_has_writers(struct nfs_inode *nfsi)
874f9463 1232{
ca0daa27
TM		 1233 struct inode *inode = &nfsi->vfs_inode;
1234
1235 assert_spin_locked(&inode->i_lock);
1236
1237 if (!S_ISREG(inode->i_mode))
1238 return false;
1239 if (list_empty(&nfsi->open_files))
1240 return false;
1241 /* Note: This relies on nfsi->open_files being ordered with writers
1242 * being placed at the head of the list.
1243 * See nfs_inode_attach_open_context()
1244 */
1245 return (list_first_entry(&nfsi->open_files,
1246 struct nfs_open_context,
1247 list)->mode & FMODE_WRITE) == FMODE_WRITE;
874f9463
TM		 1248}
1249
651b0e70 1250static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
874f9463 1251{
651b0e70 1252 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
874f9463
TM		 1253}
1254
27dc1cd3 1255static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
a895b4a1
TM		 1256{
1257 struct nfs_inode *nfsi = NFS_I(inode);
27dc1cd3 1258 unsigned long ret = 0;
a895b4a1 1259
9e6e70f8
TM		 1260 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1261 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
a9a4a87a
TM		 1262 && inode->i_version == fattr->pre_change_attr) {
1263 inode->i_version = fattr->change_attr;
70ca8852 1264 if (S_ISDIR(inode->i_mode))
6edf9609 1265 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
27dc1cd3 1266 ret |= NFS_INO_INVALID_ATTR;
70ca8852 1267 }
a895b4a1 1268 /* If we have atomic WCC data, we may update some attributes */
9e6e70f8
TM		 1269 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1270 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
27dc1cd3
TM		 1271 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1272 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1273 ret |= NFS_INO_INVALID_ATTR;
1274 }
9e6e70f8
TM		 1275
1276 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1277 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1278 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
27dc1cd3
TM		 1279 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1280 if (S_ISDIR(inode->i_mode))
6edf9609 1281 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
27dc1cd3 1282 ret |= NFS_INO_INVALID_ATTR;
a895b4a1 1283 }
9e6e70f8
TM		 1284 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1285 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1286 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
cb1410c7 1287 && nfsi->nrequests == 0) {
27dc1cd3
TM		 1288 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1289 ret |= NFS_INO_INVALID_ATTR;
1290 }
de242c0b 1291
27dc1cd3 1292 return ret;
a895b4a1
TM		 1293}
1294
1da177e4 1295/**
33801147 1296 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1da177e4
LT		 1297 * @inode - pointer to inode
1298 * @fattr - updated attributes
1299 *
1300 * Verifies the attribute cache. If we have just changed the attributes,
1301 * so that fattr carries weak cache consistency data, then it may
1302 * also update the ctime/mtime/change_attribute.
1303 */
33801147 1304static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1da177e4
LT		 1305{
1306 struct nfs_inode *nfsi = NFS_I(inode);
1307 loff_t cur_size, new_isize;
2a3f5fd4 1308 unsigned long invalid = 0;
1da177e4 1309
dc59250c 1310
01da47bd
TM		 1311 if (nfs_have_delegated_attributes(inode))
1312 return 0;
ca62b9c3 1313 /* Has the inode gone and changed behind our back? */
9e6e70f8
TM		 1314 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1315 return -EIO;
1316 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
ca62b9c3 1317 return -EIO;
ca62b9c3 1318
651b0e70 1319 if (!nfs_file_has_buffered_writers(nfsi)) {
ca0daa27
TM		 1320 /* Verify a few of the more important attributes */
1321 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && inode->i_version != fattr->change_attr)
1322 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_REVAL_PAGECACHE;
1da177e4 1323
ca0daa27
TM		 1324 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1325 invalid |= NFS_INO_INVALID_ATTR;
ca62b9c3 1326
ca0daa27
TM		 1327 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&inode->i_ctime, &fattr->ctime))
1328 invalid |= NFS_INO_INVALID_ATTR;
1329
1330 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1331 cur_size = i_size_read(inode);
1332 new_isize = nfs_size_to_loff_t(fattr->size);
1333 if (cur_size != new_isize)
1334 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1335 }
9e6e70f8 1336 }
1da177e4
LT		 1337
1338 /* Have any file permissions changed? */
9e6e70f8
TM		 1339 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1340 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
9ff593c4 1341 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
9e6e70f8 1342 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
9ff593c4 1343 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
2a3f5fd4 1344 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1da177e4
LT		 1345
1346 /* Has the link count changed? */
9e6e70f8 1347 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
2a3f5fd4 1348 invalid |= NFS_INO_INVALID_ATTR;
1da177e4 1349
9e6e70f8 1350 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
2a3f5fd4
TM		 1351 invalid |= NFS_INO_INVALID_ATIME;
1352
1353 if (invalid != 0)
1ad13dbc 1354 nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED);
1da177e4 1355
33801147 1356 nfsi->read_cache_jiffies = fattr->time_start;
1da177e4
LT		 1357 return 0;
1358}
1359
ae05f269 1360static atomic_long_t nfs_attr_generation_counter;
4704f0e2
TM		 1361
1362static unsigned long nfs_read_attr_generation_counter(void)
1363{
ae05f269 1364 return atomic_long_read(&nfs_attr_generation_counter);
4704f0e2
TM		 1365}
1366
1367unsigned long nfs_inc_attr_generation_counter(void)
1368{
ae05f269 1369 return atomic_long_inc_return(&nfs_attr_generation_counter);
4704f0e2 1370}
3235b403 1371EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
4704f0e2
TM		 1372
1373void nfs_fattr_init(struct nfs_fattr *fattr)
1374{
1375 fattr->valid = 0;
1376 fattr->time_start = jiffies;
1377 fattr->gencount = nfs_inc_attr_generation_counter();
6926afd1
TM		 1378 fattr->owner_name = NULL;
1379 fattr->group_name = NULL;
4704f0e2 1380}
ddda8e0a 1381EXPORT_SYMBOL_GPL(nfs_fattr_init);
4704f0e2 1382
140e049c
TM		 1383/**
1384 * nfs_fattr_set_barrier
1385 * @fattr: attributes
1386 *
1387 * Used to set a barrier after an attribute was updated. This
1388 * barrier ensures that older attributes from RPC calls that may
1389 * have raced with our update cannot clobber these new values.
1390 * Note that you are still responsible for ensuring that other
1391 * operations which change the attribute on the server do not
1392 * collide.
1393 */
1394void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1395{
1396 fattr->gencount = nfs_inc_attr_generation_counter();
1397}
1398
2d36bfde
TM		 1399struct nfs_fattr *nfs_alloc_fattr(void)
1400{
1401 struct nfs_fattr *fattr;
1402
1403 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1404 if (fattr != NULL)
1405 nfs_fattr_init(fattr);
1406 return fattr;
1407}
ddda8e0a 1408EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
2d36bfde
TM		 1409
1410struct nfs_fh *nfs_alloc_fhandle(void)
1411{
1412 struct nfs_fh *fh;
1413
1414 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1415 if (fh != NULL)
1416 fh->size = 0;
1417 return fh;
1418}
ddda8e0a 1419EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
2d36bfde 1420
e27d359e 1421#ifdef NFS_DEBUG
d8e0539e
WAA		 1422/*
1423 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1424 * in the same way that wireshark does
1425 *
1426 * @fh: file handle
1427 *
1428 * For debugging only.
1429 */
1430u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1431{
1432 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1433 * not on the result */
1264a2f0 1434 return nfs_fhandle_hash(fh);
d8e0539e 1435}
9e6ee76d 1436EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
d8e0539e
WAA		 1437
1438/*
20d27e92
CL		 1439 * _nfs_display_fhandle - display an NFS file handle on the console
1440 *
1441 * @fh: file handle to display
1442 * @caption: display caption
1443 *
1444 * For debugging only.
1445 */
20d27e92
CL		 1446void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1447{
1448 unsigned short i;
1449
fa68a1ba 1450 if (fh == NULL || fh->size == 0) {
20d27e92
CL		 1451 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1452 return;
1453 }
1454
d8e0539e
WAA		 1455 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1456 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
20d27e92
CL		 1457 for (i = 0; i < fh->size; i += 16) {
1458 __be32 *pos = (__be32 *)&fh->data[i];
1459
1460 switch ((fh->size - i - 1) >> 2) {
1461 case 0:
1462 printk(KERN_DEFAULT " %08x\n",
1463 be32_to_cpup(pos));
1464 break;
1465 case 1:
1466 printk(KERN_DEFAULT " %08x %08x\n",
1467 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1468 break;
1469 case 2:
1470 printk(KERN_DEFAULT " %08x %08x %08x\n",
1471 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1472 be32_to_cpup(pos + 2));
1473 break;
1474 default:
1475 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1476 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1477 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1478 }
1479 }
1480}
9e6ee76d 1481EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
20d27e92
CL		 1482#endif
1483
a10ad176
TM		 1484/**
1485 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1486 * @inode - pointer to inode
1487 * @fattr - attributes
1488 *
1489 * Attempt to divine whether or not an RPC call reply carrying stale
1490 * attributes got scheduled after another call carrying updated ones.
1491 *
1492 * To do so, the function first assumes that a more recent ctime means
1493 * that the attributes in fattr are newer, however it also attempt to
1494 * catch the case where ctime either didn't change, or went backwards
1495 * (if someone reset the clock on the server) by looking at whether
1496 * or not this RPC call was started after the inode was last updated.
4704f0e2 1497 * Note also the check for wraparound of 'attr_gencount'
a10ad176
TM		 1498 *
1499 * The function returns 'true' if it thinks the attributes in 'fattr' are
1500 * more recent than the ones cached in the inode.
1501 *
1502 */
1503static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1504{
1505 const struct nfs_inode *nfsi = NFS_I(inode);
1506
4704f0e2 1507 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
4704f0e2 1508 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
a10ad176
TM		 1509}
1510
1511static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1512{
f4ce1299
TM		 1513 int ret;
1514
1515 trace_nfs_refresh_inode_enter(inode);
1516
a10ad176 1517 if (nfs_inode_attrs_need_update(inode, fattr))
f4ce1299
TM		 1518 ret = nfs_update_inode(inode, fattr);
1519 else
1520 ret = nfs_check_inode_attributes(inode, fattr);
1521
1522 trace_nfs_refresh_inode_exit(inode, ret);
1523 return ret;
870a5be8
TM		 1524}
1525
33801147
TM		 1526/**
1527 * nfs_refresh_inode - try to update the inode attribute cache
1528 * @inode - pointer to inode
1529 * @fattr - updated attributes
1530 *
1531 * Check that an RPC call that returned attributes has not overlapped with
1532 * other recent updates of the inode metadata, then decide whether it is
1533 * safe to do a full update of the inode attributes, or whether just to
1534 * call nfs_check_inode_attributes.
1535 */
1536int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1537{
33801147
TM		 1538 int status;
1539
1540 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1541 return 0;
1542 spin_lock(&inode->i_lock);
870a5be8 1543 status = nfs_refresh_inode_locked(inode, fattr);
33801147 1544 spin_unlock(&inode->i_lock);
ef79c097 1545
33801147
TM		 1546 return status;
1547}
ddda8e0a 1548EXPORT_SYMBOL_GPL(nfs_refresh_inode);
33801147 1549
d65f557f
TM		 1550static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1551{
ca0daa27 1552 unsigned long invalid = NFS_INO_INVALID_ATTR;
d65f557f 1553
6edf9609
TM		 1554 if (S_ISDIR(inode->i_mode))
1555 invalid |= NFS_INO_INVALID_DATA;
1556 nfs_set_cache_invalid(inode, invalid);
d65f557f
TM		 1557 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1558 return 0;
1559 return nfs_refresh_inode_locked(inode, fattr);
1560}
1561
decf491f
TM		 1562/**
1563 * nfs_post_op_update_inode - try to update the inode attribute cache
1564 * @inode - pointer to inode
1565 * @fattr - updated attributes
1566 *
1567 * After an operation that has changed the inode metadata, mark the
1568 * attribute cache as being invalid, then try to update it.
f551e44f
CL		 1569 *
1570 * NB: if the server didn't return any post op attributes, this
1571 * function will force the retrieval of attributes before the next
1572 * NFS request. Thus it should be used only for operations that
1573 * are expected to change one or more attributes, to avoid
1574 * unnecessary NFS requests and trips through nfs_update_inode().
decf491f
TM		 1575 */
1576int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1577{
d65f557f 1578 int status;
decf491f 1579
7668fdbe 1580 spin_lock(&inode->i_lock);
92d64e47 1581 nfs_fattr_set_barrier(fattr);
d65f557f 1582 status = nfs_post_op_update_inode_locked(inode, fattr);
7668fdbe 1583 spin_unlock(&inode->i_lock);
aa9c2669 1584
870a5be8 1585 return status;
decf491f 1586}
1c606fb7 1587EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
decf491f 1588
70ca8852 1589/**
a08a8cd3 1590 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
70ca8852
TM		 1591 * @inode - pointer to inode
1592 * @fattr - updated attributes
1593 *
1594 * After an operation that has changed the inode metadata, mark the
1595 * attribute cache as being invalid, then try to update it. Fake up
1596 * weak cache consistency data, if none exist.
1597 *
1598 * This function is mainly designed to be used by the ->write_done() functions.
1599 */
a08a8cd3 1600int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
70ca8852 1601{
d65f557f
TM		 1602 int status;
1603
d65f557f
TM		 1604 /* Don't do a WCC update if these attributes are already stale */
1605 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1606 !nfs_inode_attrs_need_update(inode, fattr)) {
9e6e70f8
TM		 1607 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1608 | NFS_ATTR_FATTR_PRESIZE
1609 | NFS_ATTR_FATTR_PREMTIME
1610 | NFS_ATTR_FATTR_PRECTIME);
d65f557f
TM		 1611 goto out_noforce;
1612 }
9e6e70f8
TM		 1613 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1614 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
a9a4a87a 1615 fattr->pre_change_attr = inode->i_version;
9e6e70f8 1616 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
70ca8852 1617 }
9e6e70f8
TM		 1618 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1619 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
70ca8852 1620 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
9e6e70f8
TM		 1621 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1622 }
1623 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1624 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
70ca8852 1625 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
9e6e70f8
TM		 1626 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1627 }
1628 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1629 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
a3d01454 1630 fattr->pre_size = i_size_read(inode);
9e6e70f8 1631 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
70ca8852 1632 }
d65f557f
TM		 1633out_noforce:
1634 status = nfs_post_op_update_inode_locked(inode, fattr);
a08a8cd3
TM		 1635 return status;
1636}
1637
1638/**
1639 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1640 * @inode - pointer to inode
1641 * @fattr - updated attributes
1642 *
1643 * After an operation that has changed the inode metadata, mark the
1644 * attribute cache as being invalid, then try to update it. Fake up
1645 * weak cache consistency data, if none exist.
1646 *
1647 * This function is mainly designed to be used by the ->write_done() functions.
1648 */
1649int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1650{
1651 int status;
1652
1653 spin_lock(&inode->i_lock);
8f8ba1d7 1654 nfs_fattr_set_barrier(fattr);
a08a8cd3 1655 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
d65f557f
TM		 1656 spin_unlock(&inode->i_lock);
1657 return status;
70ca8852 1658}
ddda8e0a 1659EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
70ca8852 1660
ea96d1ec
AS		 1661
1662static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1663 struct nfs_fattr *fattr)
1664{
1665 bool ret1 = true, ret2 = true;
1666
1667 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1668 ret1 = (nfsi->fileid == fattr->fileid);
1669 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1670 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1671 return ret1 || ret2;
1672}
1673
1da177e4
LT		 1674/*
1675 * Many nfs protocol calls return the new file attributes after
1676 * an operation. Here we update the inode to reflect the state
1677 * of the server's inode.
1678 *
1679 * This is a bit tricky because we have to make sure all dirty pages
1680 * have been sent off to the server before calling invalidate_inode_pages.
1681 * To make sure no other process adds more write requests while we try
1682 * our best to flush them, we make them sleep during the attribute refresh.
1683 *
1684 * A very similar scenario holds for the dir cache.
1685 */
24aa1fe6 1686static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1da177e4 1687{
8b4bdcf8 1688 struct nfs_server *server;
1da177e4 1689 struct nfs_inode *nfsi = NFS_I(inode);
951a143b 1690 loff_t cur_isize, new_isize;
2a3f5fd4 1691 unsigned long invalid = 0;
3e7d950a 1692 unsigned long now = jiffies;
62ab460c 1693 unsigned long save_cache_validity;
651b0e70 1694 bool have_writers = nfs_file_has_buffered_writers(nfsi);
944171cb 1695 bool cache_revalidated = true;
1da177e4 1696
1e8968c5 1697 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
3110ff80 1698 __func__, inode->i_sb->s_id, inode->i_ino,
4f1abd22 1699 nfs_display_fhandle_hash(NFS_FH(inode)),
1da177e4
LT		 1700 atomic_read(&inode->i_count), fattr->valid);
1701
ea96d1ec 1702 if (!nfs_fileid_valid(nfsi, fattr)) {
e73e6c9e
MT		 1703 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1704 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1705 NFS_SERVER(inode)->nfs_client->cl_hostname,
1706 inode->i_sb->s_id, (long long)nfsi->fileid,
1707 (long long)fattr->fileid);
1708 goto out_err;
1709 }
1da177e4
LT		 1710
1711 /*
1712 * Make sure the inode's type hasn't changed.
1713 */
e73e6c9e
MT		 1714 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1715 /*
1716 * Big trouble! The inode has become a different object.
1717 */
1e8968c5 1718 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
e73e6c9e
MT		 1719 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1720 goto out_err;
1721 }
1da177e4 1722
8b4bdcf8 1723 server = NFS_SERVER(inode);
a0356862 1724 /* Update the fsid? */
9e6e70f8 1725 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
c37dcd33 1726 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
36d43a43 1727 !IS_AUTOMOUNT(inode))
8b4bdcf8
TM		 1728 server->fsid = fattr->fsid;
1729
1da177e4
LT		 1730 /*
1731 * Update the read time so we don't revalidate too often.
1732 */
33801147 1733 nfsi->read_cache_jiffies = fattr->time_start;
3e7d950a 1734
62ab460c
TM		 1735 save_cache_validity = nfsi->cache_validity;
1736 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1737 | NFS_INO_INVALID_ATIME
1738 | NFS_INO_REVAL_FORCED
1739 | NFS_INO_REVAL_PAGECACHE);
1da177e4 1740
a895b4a1 1741 /* Do atomic weak cache consistency updates */
27dc1cd3 1742 invalid |= nfs_wcc_update_inode(inode, fattr);
a895b4a1 1743
944171cb
BC		 1744 if (pnfs_layoutcommit_outstanding(inode)) {
1745 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1746 cache_revalidated = false;
1747 }
10b7e9ad 1748
47aabaa7 1749 /* More cache consistency checks */
9e6e70f8 1750 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
a9a4a87a 1751 if (inode->i_version != fattr->change_attr) {
9e6e70f8
TM		 1752 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1753 inode->i_sb->s_id, inode->i_ino);
38512aa9 1754 /* Could it be a race with writeback? */
ca0daa27 1755 if (!have_writers) {
38512aa9
TM		 1756 invalid |= NFS_INO_INVALID_ATTR
1757 | NFS_INO_INVALID_DATA
1758 | NFS_INO_INVALID_ACCESS
1759 | NFS_INO_INVALID_ACL;
1760 if (S_ISDIR(inode->i_mode))
1761 nfs_force_lookup_revalidate(inode);
1762 }
a9a4a87a 1763 inode->i_version = fattr->change_attr;
9e6e70f8 1764 }
ade14a7d 1765 } else {
43b6535e 1766 nfsi->cache_validity |= save_cache_validity;
ade14a7d
TM		 1767 cache_revalidated = false;
1768 }
9e6e70f8
TM		 1769
1770 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
fee7fe19 1771 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
ade14a7d 1772 } else if (server->caps & NFS_CAP_MTIME) {
43b6535e
TM		 1773 nfsi->cache_validity |= save_cache_validity &
1774 (NFS_INO_INVALID_ATTR
62ab460c 1775 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1776 cache_revalidated = false;
1777 }
62ab460c 1778
9e6e70f8 1779 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
fee7fe19 1780 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
ade14a7d 1781 } else if (server->caps & NFS_CAP_CTIME) {
43b6535e
TM		 1782 nfsi->cache_validity |= save_cache_validity &
1783 (NFS_INO_INVALID_ATTR
62ab460c 1784 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1785 cache_revalidated = false;
1786 }
47aabaa7 1787
951a143b 1788 /* Check if our cached file size is stale */
9e6e70f8
TM		 1789 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1790 new_isize = nfs_size_to_loff_t(fattr->size);
1791 cur_isize = i_size_read(inode);
1792 if (new_isize != cur_isize) {
1793 /* Do we perhaps have any outstanding writes, or has
1794 * the file grown beyond our last write? */
ca0daa27 1795 if (nfsi->nrequests == 0 || new_isize > cur_isize) {
9e6e70f8 1796 i_size_write(inode, new_isize);
ca0daa27
TM		 1797 if (!have_writers)
1798 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
9e6e70f8 1799 }
60c16ea8
HJ		 1800 dprintk("NFS: isize change on server for file %s/%ld "
1801 "(%Ld to %Ld)\n",
1802 inode->i_sb->s_id,
1803 inode->i_ino,
1804 (long long)cur_isize,
1805 (long long)new_isize);
1da177e4 1806 }
ade14a7d 1807 } else {
43b6535e
TM		 1808 nfsi->cache_validity |= save_cache_validity &
1809 (NFS_INO_INVALID_ATTR
62ab460c
TM		 1810 | NFS_INO_REVAL_PAGECACHE
1811 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1812 cache_revalidated = false;
1813 }
1da177e4 1814
1da177e4 1815
9e6e70f8
TM		 1816 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1817 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
ade14a7d 1818 else if (server->caps & NFS_CAP_ATIME) {
43b6535e
TM		 1819 nfsi->cache_validity |= save_cache_validity &
1820 (NFS_INO_INVALID_ATIME
62ab460c 1821 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1822 cache_revalidated = false;
1823 }
1da177e4 1824
9e6e70f8
TM		 1825 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1826 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
9b4b3513
TM		 1827 umode_t newmode = inode->i_mode & S_IFMT;
1828 newmode |= fattr->mode & S_IALLUGO;
1829 inode->i_mode = newmode;
9e6e70f8 1830 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
9e6e70f8 1831 }
ade14a7d 1832 } else if (server->caps & NFS_CAP_MODE) {
43b6535e
TM		 1833 nfsi->cache_validity |= save_cache_validity &
1834 (NFS_INO_INVALID_ATTR
62ab460c
TM		 1835 | NFS_INO_INVALID_ACCESS
1836 | NFS_INO_INVALID_ACL
1837 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1838 cache_revalidated = false;
1839 }
62ab460c 1840
9e6e70f8 1841 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
9ff593c4 1842 if (!uid_eq(inode->i_uid, fattr->uid)) {
9e6e70f8
TM		 1843 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1844 inode->i_uid = fattr->uid;
1845 }
ade14a7d 1846 } else if (server->caps & NFS_CAP_OWNER) {
43b6535e
TM		 1847 nfsi->cache_validity |= save_cache_validity &
1848 (NFS_INO_INVALID_ATTR
62ab460c
TM		 1849 | NFS_INO_INVALID_ACCESS
1850 | NFS_INO_INVALID_ACL
1851 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1852 cache_revalidated = false;
1853 }
62ab460c 1854
9e6e70f8 1855 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
9ff593c4 1856 if (!gid_eq(inode->i_gid, fattr->gid)) {
9e6e70f8
TM		 1857 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1858 inode->i_gid = fattr->gid;
1859 }
ade14a7d 1860 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
43b6535e
TM		 1861 nfsi->cache_validity |= save_cache_validity &
1862 (NFS_INO_INVALID_ATTR
62ab460c
TM		 1863 | NFS_INO_INVALID_ACCESS
1864 | NFS_INO_INVALID_ACL
1865 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1866 cache_revalidated = false;
1867 }
921615f1 1868
9e6e70f8
TM		 1869 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1870 if (inode->i_nlink != fattr->nlink) {
1871 invalid |= NFS_INO_INVALID_ATTR;
1872 if (S_ISDIR(inode->i_mode))
1873 invalid |= NFS_INO_INVALID_DATA;
bfe86848 1874 set_nlink(inode, fattr->nlink);
9e6e70f8 1875 }
ade14a7d 1876 } else if (server->caps & NFS_CAP_NLINK) {
43b6535e
TM		 1877 nfsi->cache_validity |= save_cache_validity &
1878 (NFS_INO_INVALID_ATTR
62ab460c 1879 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1880 cache_revalidated = false;
1881 }
1da177e4 1882
9e6e70f8 1883 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 1884 /*
1885 * report the blocks in 512byte units
1886 */
1887 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
ade14a7d 1888 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
9e6e70f8 1889 inode->i_blocks = fattr->du.nfs2.blocks;
ade14a7d
TM		 1890 else
1891 cache_revalidated = false;
1da177e4
LT		 1892
1893 /* Update attrtimeo value if we're out of the unstable period */
fd1defc2 1894 if (invalid & NFS_INO_INVALID_ATTR) {
91d5b470 1895 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1da177e4 1896 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
3e7d950a 1897 nfsi->attrtimeo_timestamp = now;
f5062003 1898 /* Set barrier to be more recent than all outstanding updates */
4704f0e2 1899 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
6d2b2966 1900 } else {
ade14a7d
TM		 1901 if (cache_revalidated) {
1902 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
1903 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1904 nfsi->attrtimeo <<= 1;
1905 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
1906 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1907 }
6d2b2966
TM		 1908 nfsi->attrtimeo_timestamp = now;
1909 }
f5062003
TM		 1910 /* Set the barrier to be more recent than this fattr */
1911 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
1912 nfsi->attr_gencount = fattr->gencount;
1da177e4 1913 }
c812012f
JL		 1914
1915 /* Don't declare attrcache up to date if there were no attrs! */
ade14a7d 1916 if (cache_revalidated)
c812012f
JL		 1917 invalid &= ~NFS_INO_INVALID_ATTR;
1918
1da177e4
LT		 1919 /* Don't invalidate the data if we were to blame */
1920 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1921 || S_ISLNK(inode->i_mode)))
1922 invalid &= ~NFS_INO_INVALID_DATA;
011e2a7f 1923 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
62ab460c 1924 (save_cache_validity & NFS_INO_REVAL_FORCED))
6edf9609 1925 nfs_set_cache_invalid(inode, invalid);
de242c0b 1926
1da177e4 1927 return 0;
b37b03b7 1928 out_err:
1da177e4
LT		 1929 /*
1930 * No need to worry about unhashing the dentry, as the
1931 * lookup validation will know that the inode is bad.
1932 * (But we fall through to invalidate the caches.)
1933 */
1934 nfs_invalidate_inode(inode);
1da177e4
LT		 1935 return -ESTALE;
1936}
1937
f7b422b1 1938struct inode *nfs_alloc_inode(struct super_block *sb)
1da177e4
LT		 1939{
1940 struct nfs_inode *nfsi;
c456aacf 1941 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1da177e4
LT		 1942 if (!nfsi)
1943 return NULL;
55296809
CL		 1944 nfsi->flags = 0UL;
1945 nfsi->cache_validity = 0UL;
89d77c8f 1946#if IS_ENABLED(CONFIG_NFS_V4)
e50a1c2e
BF		 1947 nfsi->nfs4_acl = NULL;
1948#endif /* CONFIG_NFS_V4 */
1da177e4
LT		 1949 return &nfsi->vfs_inode;
1950}
89d77c8f 1951EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1da177e4 1952
fa0d7e3d 1953static void nfs_i_callback(struct rcu_head *head)
1da177e4 1954{
fa0d7e3d 1955 struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4
LT		 1956 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1957}
1958
fa0d7e3d
NP		 1959void nfs_destroy_inode(struct inode *inode)
1960{
1961 call_rcu(&inode->i_rcu, nfs_i_callback);
1962}
89d77c8f 1963EXPORT_SYMBOL_GPL(nfs_destroy_inode);
fa0d7e3d 1964
d75d5414
AM		 1965static inline void nfs4_init_once(struct nfs_inode *nfsi)
1966{
89d77c8f 1967#if IS_ENABLED(CONFIG_NFS_V4)
d75d5414
AM		 1968 INIT_LIST_HEAD(&nfsi->open_states);
1969 nfsi->delegation = NULL;
d75d5414 1970 init_rwsem(&nfsi->rwsem);
e5e94017 1971 nfsi->layout = NULL;
d75d5414
AM		 1972#endif
1973}
f7b422b1 1974
51cc5068 1975static void init_once(void *foo)
1da177e4
LT		 1976{
1977 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1978
a35afb83 1979 inode_init_once(&nfsi->vfs_inode);
a35afb83
CL		 1980 INIT_LIST_HEAD(&nfsi->open_files);
1981 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1982 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
ea2cf228 1983 INIT_LIST_HEAD(&nfsi->commit_info.list);
cb1410c7 1984 nfsi->nrequests = 0;
ea2cf228 1985 nfsi->commit_info.ncommit = 0;
1a0de48a 1986 atomic_set(&nfsi->commit_info.rpcs_out, 0);
884be175 1987 init_rwsem(&nfsi->rmdir_sem);
a35afb83 1988 nfs4_init_once(nfsi);
1da177e4 1989}
20c2df83 1990
f7b422b1 1991static int __init nfs_init_inodecache(void)
1da177e4
LT		 1992{
1993 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1994 sizeof(struct nfs_inode),
fffb60f9 1995 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 1996 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 1997 init_once);
1da177e4
LT		 1998 if (nfs_inode_cachep == NULL)
1999 return -ENOMEM;
2000
2001 return 0;
2002}
2003
266bee88 2004static void nfs_destroy_inodecache(void)
1da177e4 2005{
8c0a8537
KS		 2006 /*
2007 * Make sure all delayed rcu free inodes are flushed before we
2008 * destroy cache.
2009 */
2010 rcu_barrier();
1a1d92c1 2011 kmem_cache_destroy(nfs_inode_cachep);
1da177e4
LT		 2012}
2013
5746006f 2014struct workqueue_struct *nfsiod_workqueue;
89d77c8f 2015EXPORT_SYMBOL_GPL(nfsiod_workqueue);
5746006f
TM		 2016
2017/*
2018 * start up the nfsiod workqueue
2019 */
2020static int nfsiod_start(void)
2021{
2022 struct workqueue_struct *wq;
2023 dprintk("RPC: creating workqueue nfsiod\n");
ada609ee 2024 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
5746006f
TM		 2025 if (wq == NULL)
2026 return -ENOMEM;
2027 nfsiod_workqueue = wq;
2028 return 0;
2029}
2030
2031/*
2032 * Destroy the nfsiod workqueue
2033 */
2034static void nfsiod_stop(void)
2035{
2036 struct workqueue_struct *wq;
2037
2038 wq = nfsiod_workqueue;
2039 if (wq == NULL)
2040 return;
2041 nfsiod_workqueue = NULL;
2042 destroy_workqueue(wq);
2043}
2044
c7d03a00 2045unsigned int nfs_net_id;
9e2e74db 2046EXPORT_SYMBOL_GPL(nfs_net_id);
1b340d01
SK		 2047
2048static int nfs_net_init(struct net *net)
2049{
6b13168b 2050 nfs_clients_init(net);
65b38851 2051 return nfs_fs_proc_net_init(net);
1b340d01
SK		 2052}
2053
2054static void nfs_net_exit(struct net *net)
2055{
65b38851 2056 nfs_fs_proc_net_exit(net);
28cd1b3f 2057 nfs_cleanup_cb_ident_idr(net);
1b340d01
SK		 2058}
2059
2060static struct pernet_operations nfs_net_ops = {
2061 .init = nfs_net_init,
2062 .exit = nfs_net_exit,
2063 .id = &nfs_net_id,
2064 .size = sizeof(struct nfs_net),
2065};
2066
1da177e4
LT		 2067/*
2068 * Initialize NFS
2069 */
2070static int __init init_nfs_fs(void)
2071{
2072 int err;
2073
1b340d01 2074 err = register_pernet_subsys(&nfs_net_ops);
e571cbf1 2075 if (err < 0)
89d77c8f 2076 goto out9;
e571cbf1 2077
8ec442ae
DH		 2078 err = nfs_fscache_register();
2079 if (err < 0)
89d77c8f 2080 goto out8;
8ec442ae 2081
5746006f
TM		 2082 err = nfsiod_start();
2083 if (err)
89d77c8f 2084 goto out7;
5746006f 2085
6aaca566
DH		 2086 err = nfs_fs_proc_init();
2087 if (err)
89d77c8f 2088 goto out6;
6aaca566 2089
1da177e4
LT		 2090 err = nfs_init_nfspagecache();
2091 if (err)
89d77c8f 2092 goto out5;
1da177e4
LT		 2093
2094 err = nfs_init_inodecache();
2095 if (err)
89d77c8f 2096 goto out4;
1da177e4
LT		 2097
2098 err = nfs_init_readpagecache();
2099 if (err)
89d77c8f 2100 goto out3;
1da177e4
LT		 2101
2102 err = nfs_init_writepagecache();
2103 if (err)
89d77c8f 2104 goto out2;
1da177e4 2105
1da177e4
LT		 2106 err = nfs_init_directcache();
2107 if (err)
89d77c8f 2108 goto out1;
1da177e4 2109
ec7652aa 2110 rpc_proc_register(&init_net, &nfs_rpcstat);
cd738ee9
KM		 2111
2112 err = register_nfs_fs();
2113 if (err)
129d1977
BS		 2114 goto out0;
2115
1da177e4 2116 return 0;
129d1977 2117out0:
ec7652aa 2118 rpc_proc_unregister(&init_net, "nfs");
1da177e4 2119 nfs_destroy_directcache();
89d77c8f 2120out1:
129d1977 2121 nfs_destroy_writepagecache();
89d77c8f 2122out2:
129d1977 2123 nfs_destroy_readpagecache();
89d77c8f 2124out3:
129d1977 2125 nfs_destroy_inodecache();
89d77c8f 2126out4:
129d1977 2127 nfs_destroy_nfspagecache();
89d77c8f 2128out5:
129d1977 2129 nfs_fs_proc_exit();
89d77c8f 2130out6:
129d1977 2131 nfsiod_stop();
89d77c8f 2132out7:
129d1977 2133 nfs_fscache_unregister();
89d77c8f 2134out8:
129d1977 2135 unregister_pernet_subsys(&nfs_net_ops);
89d77c8f 2136out9:
1da177e4
LT		 2137 return err;
2138}
2139
2140static void __exit exit_nfs_fs(void)
2141{
1da177e4 2142 nfs_destroy_directcache();
1da177e4
LT		 2143 nfs_destroy_writepagecache();
2144 nfs_destroy_readpagecache();
2145 nfs_destroy_inodecache();
2146 nfs_destroy_nfspagecache();
8ec442ae 2147 nfs_fscache_unregister();
1b340d01 2148 unregister_pernet_subsys(&nfs_net_ops);
ec7652aa 2149 rpc_proc_unregister(&init_net, "nfs");
f7b422b1 2150 unregister_nfs_fs();
6aaca566 2151 nfs_fs_proc_exit();
5746006f 2152 nfsiod_stop();
1da177e4
LT		 2153}
2154
2155/* Not quite true; I just maintain it */
2156MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2157MODULE_LICENSE("GPL");
f43bf0be 2158module_param(enable_ino64, bool, 0644);
1da177e4
LT		 2159
2160module_init(init_nfs_fs)
2161module_exit(exit_nfs_fs)
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