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Merge tag 'acpi-4.12-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
[mirror_ubuntu-bionic-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
59b86d85
HT		 737 if (!(server->flags & NFS_MOUNT_NOAC))
738 nfs_readdirplus_parent_cache_miss(path->dentry);
739 else
740 nfs_readdirplus_parent_cache_hit(path->dentry);
311324ad 741 err = __nfs_revalidate_inode(server, inode);
1bcf4c5c 742 } else
a528d35e 743 nfs_readdirplus_parent_cache_hit(path->dentry);
4e769b93 744 if (!err) {
1da177e4 745 generic_fillattr(inode, stat);
f43bf0be 746 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
7ef5ca4f
N		 747 if (S_ISDIR(inode->i_mode))
748 stat->blksize = NFS_SERVER(inode)->dtsize;
4e769b93 749 }
acdc53b2 750out:
f4ce1299 751 trace_nfs_getattr_exit(inode, err);
1da177e4
LT		 752 return err;
753}
ddda8e0a 754EXPORT_SYMBOL_GPL(nfs_getattr);
1da177e4 755
f11ac8db
TM		 756static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
757{
758 atomic_set(&l_ctx->count, 1);
d51fdb87 759 l_ctx->lockowner = current->files;
f11ac8db 760 INIT_LIST_HEAD(&l_ctx->list);
210c7c17 761 atomic_set(&l_ctx->io_count, 0);
f11ac8db
TM		 762}
763
764static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
765{
8c86899f
TM		 766 struct nfs_lock_context *head = &ctx->lock_context;
767 struct nfs_lock_context *pos = head;
f11ac8db 768
8c86899f 769 do {
d51fdb87 770 if (pos->lockowner != current->files)
f11ac8db
TM		 771 continue;
772 atomic_inc(&pos->count);
773 return pos;
8c86899f 774 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
f11ac8db
TM		 775 return NULL;
776}
777
778struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
779{
780 struct nfs_lock_context *res, *new = NULL;
2b0143b5 781 struct inode *inode = d_inode(ctx->dentry);
f11ac8db
TM		 782
783 spin_lock(&inode->i_lock);
784 res = __nfs_find_lock_context(ctx);
785 if (res == NULL) {
786 spin_unlock(&inode->i_lock);
787 new = kmalloc(sizeof(*new), GFP_KERNEL);
788 if (new == NULL)
b3c54de6 789 return ERR_PTR(-ENOMEM);
f11ac8db
TM		 790 nfs_init_lock_context(new);
791 spin_lock(&inode->i_lock);
792 res = __nfs_find_lock_context(ctx);
793 if (res == NULL) {
794 list_add_tail(&new->list, &ctx->lock_context.list);
795 new->open_context = ctx;
796 res = new;
797 new = NULL;
798 }
799 }
800 spin_unlock(&inode->i_lock);
801 kfree(new);
802 return res;
803}
1c6dcbe5 804EXPORT_SYMBOL_GPL(nfs_get_lock_context);
f11ac8db
TM		 805
806void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
807{
808 struct nfs_open_context *ctx = l_ctx->open_context;
2b0143b5 809 struct inode *inode = d_inode(ctx->dentry);
f11ac8db
TM		 810
811 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
812 return;
813 list_del(&l_ctx->list);
814 spin_unlock(&inode->i_lock);
815 kfree(l_ctx);
816}
1c6dcbe5 817EXPORT_SYMBOL_GPL(nfs_put_lock_context);
f11ac8db 818
7fe5c398
TM		 819/**
820 * nfs_close_context - Common close_context() routine NFSv2/v3
821 * @ctx: pointer to context
822 * @is_sync: is this a synchronous close
823 *
5cf9d706
TM		 824 * Ensure that the attributes are up to date if we're mounted
825 * with close-to-open semantics and we have cached data that will
826 * need to be revalidated on open.
7fe5c398
TM		 827 */
828void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
829{
5cf9d706 830 struct nfs_inode *nfsi;
7fe5c398
TM		 831 struct inode *inode;
832 struct nfs_server *server;
833
834 if (!(ctx->mode & FMODE_WRITE))
835 return;
836 if (!is_sync)
837 return;
2b0143b5 838 inode = d_inode(ctx->dentry);
58ff4184
TM		 839 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
840 return;
5cf9d706
TM		 841 nfsi = NFS_I(inode);
842 if (inode->i_mapping->nrpages == 0)
843 return;
844 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
845 return;
846 if (!list_empty(&nfsi->open_files))
7fe5c398
TM		 847 return;
848 server = NFS_SERVER(inode);
849 if (server->flags & NFS_MOUNT_NOCTO)
850 return;
851 nfs_revalidate_inode(server, inode);
852}
ddda8e0a 853EXPORT_SYMBOL_GPL(nfs_close_context);
7fe5c398 854
532d4def
N		 855struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
856 fmode_t f_mode,
857 struct file *filp)
1da177e4
LT		 858{
859 struct nfs_open_context *ctx;
5ede7b1c
AV		 860 struct rpc_cred *cred = rpc_lookup_cred();
861 if (IS_ERR(cred))
862 return ERR_CAST(cred);
1da177e4 863
f52720ca 864 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
5ede7b1c
AV		 865 if (!ctx) {
866 put_rpccred(cred);
867 return ERR_PTR(-ENOMEM);
1da177e4 868 }
5ede7b1c
AV		 869 nfs_sb_active(dentry->d_sb);
870 ctx->dentry = dget(dentry);
871 ctx->cred = cred;
872 ctx->state = NULL;
873 ctx->mode = f_mode;
874 ctx->flags = 0;
875 ctx->error = 0;
532d4def 876 ctx->flock_owner = (fl_owner_t)filp;
5ede7b1c
AV		 877 nfs_init_lock_context(&ctx->lock_context);
878 ctx->lock_context.open_context = ctx;
879 INIT_LIST_HEAD(&ctx->list);
82be417a 880 ctx->mdsthreshold = NULL;
1da177e4
LT		 881 return ctx;
882}
89d77c8f 883EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1da177e4
LT		 884
885struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
886{
887 if (ctx != NULL)
f11ac8db 888 atomic_inc(&ctx->lock_context.count);
1da177e4
LT		 889 return ctx;
890}
89d77c8f 891EXPORT_SYMBOL_GPL(get_nfs_open_context);
1da177e4 892
7fe5c398 893static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1da177e4 894{
2b0143b5 895 struct inode *inode = d_inode(ctx->dentry);
3d4ff43d 896 struct super_block *sb = ctx->dentry->d_sb;
3bec63db 897
5c78f58e 898 if (!list_empty(&ctx->list)) {
ef84303e
BH		 899 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
900 return;
901 list_del(&ctx->list);
902 spin_unlock(&inode->i_lock);
ef84303e 903 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
5e11934d 904 return;
5c78f58e
TM		 905 if (inode != NULL)
906 NFS_PROTO(inode)->close_context(ctx, is_sync);
3bec63db
TM		 907 if (ctx->cred != NULL)
908 put_rpccred(ctx->cred);
3d4ff43d 909 dput(ctx->dentry);
322b2b90 910 nfs_sb_deactive(sb);
82be417a 911 kfree(ctx->mdsthreshold);
3bec63db
TM		 912 kfree(ctx);
913}
914
a49c3c77
TM		 915void put_nfs_open_context(struct nfs_open_context *ctx)
916{
917 __put_nfs_open_context(ctx, 0);
918}
89d77c8f 919EXPORT_SYMBOL_GPL(put_nfs_open_context);
a49c3c77 920
4eae5014
TM		 921static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
922{
923 __put_nfs_open_context(ctx, 1);
924}
925
1da177e4
LT		 926/*
927 * Ensure that mmap has a recent RPC credential for use when writing out
928 * shared pages
929 */
c45ffdd2 930void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1da177e4 931{
2b0143b5 932 struct inode *inode = d_inode(ctx->dentry);
1da177e4
LT		 933 struct nfs_inode *nfsi = NFS_I(inode);
934
1da177e4 935 spin_lock(&inode->i_lock);
ca0daa27
TM		 936 if (ctx->mode & FMODE_WRITE)
937 list_add(&ctx->list, &nfsi->open_files);
938 else
939 list_add_tail(&ctx->list, &nfsi->open_files);
1da177e4
LT		 940 spin_unlock(&inode->i_lock);
941}
c45ffdd2
TM		 942EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
943
944void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
945{
946 filp->private_data = get_nfs_open_context(ctx);
947 if (list_empty(&ctx->list))
948 nfs_inode_attach_open_context(ctx);
949}
89d77c8f 950EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1da177e4 951
d530838b
TM		 952/*
953 * Given an inode, search for an open context with the desired characteristics
954 */
dc0b027d 955struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
1da177e4
LT		 956{
957 struct nfs_inode *nfsi = NFS_I(inode);
958 struct nfs_open_context *pos, *ctx = NULL;
959
960 spin_lock(&inode->i_lock);
961 list_for_each_entry(pos, &nfsi->open_files, list) {
d530838b
TM		 962 if (cred != NULL && pos->cred != cred)
963 continue;
1544fa0f
TM		 964 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
965 continue;
966 ctx = get_nfs_open_context(pos);
967 break;
1da177e4
LT		 968 }
969 spin_unlock(&inode->i_lock);
970 return ctx;
971}
972
aff8d8dc 973void nfs_file_clear_open_context(struct file *filp)
1da177e4 974{
cd3758e3 975 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1da177e4
LT		 976
977 if (ctx) {
2b0143b5 978 struct inode *inode = d_inode(ctx->dentry);
c45ffdd2 979
0bcbf039
PT		 980 /*
981 * We fatal error on write before. Try to writeback
982 * every page again.
983 */
984 if (ctx->error < 0)
985 invalidate_inode_pages2(inode->i_mapping);
1da177e4
LT		 986 filp->private_data = NULL;
987 spin_lock(&inode->i_lock);
988 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
989 spin_unlock(&inode->i_lock);
4eae5014 990 put_nfs_open_context_sync(ctx);
1da177e4
LT		 991 }
992}
993
994/*
995 * These allocate and release file read/write context information.
996 */
997int nfs_open(struct inode *inode, struct file *filp)
998{
999 struct nfs_open_context *ctx;
1da177e4 1000
532d4def 1001 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
5ede7b1c
AV		 1002 if (IS_ERR(ctx))
1003 return PTR_ERR(ctx);
1da177e4
LT		 1004 nfs_file_set_open_context(filp, ctx);
1005 put_nfs_open_context(ctx);
f1fe29b4 1006 nfs_fscache_open_file(inode, filp);
1da177e4
LT		 1007 return 0;
1008}
1009
1da177e4
LT		 1010/*
1011 * This function is called whenever some part of NFS notices that
1012 * the cached attributes have to be refreshed.
1013 */
1014int
1015__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1016{
1017 int status = -ESTALE;
1775fd3e 1018 struct nfs4_label *label = NULL;
a3cba2aa 1019 struct nfs_fattr *fattr = NULL;
1da177e4 1020 struct nfs_inode *nfsi = NFS_I(inode);
1da177e4 1021
1e8968c5
NV		 1022 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1023 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1da177e4 1024
f4ce1299
TM		 1025 trace_nfs_revalidate_inode_enter(inode);
1026
85233a7a 1027 if (is_bad_inode(inode))
691beb13 1028 goto out;
1da177e4 1029 if (NFS_STALE(inode))
412d582e 1030 goto out;
7fdc49c4 1031
ac46bd37
TM		 1032 /* pNFS: Attributes aren't updated until we layoutcommit */
1033 if (S_ISREG(inode->i_mode)) {
1034 status = pnfs_sync_inode(inode, false);
1035 if (status)
1036 goto out;
1037 }
1038
a3cba2aa
TM		 1039 status = -ENOMEM;
1040 fattr = nfs_alloc_fattr();
1041 if (fattr == NULL)
1042 goto out;
1043
691beb13 1044 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
14c43f76
DQ		 1045
1046 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1047 if (IS_ERR(label)) {
1048 status = PTR_ERR(label);
1049 goto out;
1050 }
1051
1775fd3e 1052 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
1da177e4 1053 if (status != 0) {
1e8968c5 1054 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1da177e4 1055 inode->i_sb->s_id,
1e8968c5 1056 (unsigned long long)NFS_FILEID(inode), status);
1da177e4
LT		 1057 if (status == -ESTALE) {
1058 nfs_zap_caches(inode);
1059 if (!S_ISDIR(inode->i_mode))
3a10c30a 1060 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1da177e4 1061 }
14c43f76 1062 goto err_out;
1da177e4
LT		 1063 }
1064
a3cba2aa 1065 status = nfs_refresh_inode(inode, fattr);
1da177e4 1066 if (status) {
1e8968c5 1067 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1da177e4 1068 inode->i_sb->s_id,
1e8968c5 1069 (unsigned long long)NFS_FILEID(inode), status);
14c43f76 1070 goto err_out;
1da177e4 1071 }
55296809 1072
24aa1fe6 1073 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
ada70d94 1074 nfs_zap_acl_cache(inode);
55296809 1075
3da580aa
JL		 1076 nfs_setsecurity(inode, fattr, label);
1077
1e8968c5 1078 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1da177e4 1079 inode->i_sb->s_id,
1e8968c5 1080 (unsigned long long)NFS_FILEID(inode));
1da177e4 1081
14c43f76
DQ		 1082err_out:
1083 nfs4_label_free(label);
1084out:
a3cba2aa 1085 nfs_free_fattr(fattr);
f4ce1299 1086 trace_nfs_revalidate_inode_exit(inode, status);
1da177e4
LT		 1087 return status;
1088}
1089
43f291cd 1090int nfs_attribute_cache_expired(struct inode *inode)
d7cf8dd0 1091{
b4d2314b 1092 if (nfs_have_delegated_attributes(inode))
1da177e4 1093 return 0;
d7cf8dd0 1094 return nfs_attribute_timeout(inode);
1da177e4
LT		 1095}
1096
1097/**
1098 * nfs_revalidate_inode - Revalidate the inode attributes
1099 * @server - pointer to nfs_server struct
1100 * @inode - pointer to inode struct
1101 *
1102 * Updates inode attribute information by retrieving the data from the server.
1103 */
1104int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1105{
311324ad 1106 if (!nfs_need_revalidate_inode(inode))
1da177e4
LT		 1107 return NFS_STALE(inode) ? -ESTALE : 0;
1108 return __nfs_revalidate_inode(server, inode);
1109}
1c606fb7 1110EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1da177e4 1111
1cda707d 1112static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
717d44e8
TM		 1113{
1114 struct nfs_inode *nfsi = NFS_I(inode);
f8806c84
TM		 1115 int ret;
1116
717d44e8 1117 if (mapping->nrpages != 0) {
f8806c84 1118 if (S_ISREG(inode->i_mode)) {
ef070dcb 1119 unmap_mapping_range(mapping, 0, 0, 0);
f8806c84
TM		 1120 ret = nfs_sync_mapping(mapping);
1121 if (ret < 0)
1122 return ret;
1123 }
1124 ret = invalidate_inode_pages2(mapping);
717d44e8
TM		 1125 if (ret < 0)
1126 return ret;
1127 }
d529ef83
JL		 1128 if (S_ISDIR(inode->i_mode)) {
1129 spin_lock(&inode->i_lock);
717d44e8 1130 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
d529ef83
JL		 1131 spin_unlock(&inode->i_lock);
1132 }
717d44e8 1133 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
de242c0b 1134 nfs_fscache_wait_on_invalidate(inode);
f4ce1299 1135
1e8968c5
NV		 1136 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1137 inode->i_sb->s_id,
1138 (unsigned long long)NFS_FILEID(inode));
717d44e8
TM		 1139 return 0;
1140}
1141
1cd9cb05 1142bool nfs_mapping_need_revalidate_inode(struct inode *inode)
b4b1eadf 1143{
61540bf6
TM		 1144 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1145 NFS_STALE(inode);
b4b1eadf
TM		 1146}
1147
0d0def49
AV		 1148int nfs_revalidate_mapping_rcu(struct inode *inode)
1149{
1150 struct nfs_inode *nfsi = NFS_I(inode);
1151 unsigned long *bitlock = &nfsi->flags;
1152 int ret = 0;
1153
1154 if (IS_SWAPFILE(inode))
1155 goto out;
1156 if (nfs_mapping_need_revalidate_inode(inode)) {
1157 ret = -ECHILD;
1158 goto out;
1159 }
1160 spin_lock(&inode->i_lock);
1161 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1162 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1163 ret = -ECHILD;
1164 spin_unlock(&inode->i_lock);
1165out:
1166 return ret;
1167}
1168
717d44e8 1169/**
be527494 1170 * nfs_revalidate_mapping - Revalidate the pagecache
717d44e8
TM		 1171 * @inode - pointer to host inode
1172 * @mapping - pointer to mapping
717d44e8 1173 */
be527494
TM		 1174int nfs_revalidate_mapping(struct inode *inode,
1175 struct address_space *mapping)
717d44e8
TM		 1176{
1177 struct nfs_inode *nfsi = NFS_I(inode);
d529ef83 1178 unsigned long *bitlock = &nfsi->flags;
717d44e8 1179 int ret = 0;
dc59250c 1180
29418aa4
MG		 1181 /* swapfiles are not supposed to be shared. */
1182 if (IS_SWAPFILE(inode))
1183 goto out;
1184
b4b1eadf 1185 if (nfs_mapping_need_revalidate_inode(inode)) {
717d44e8
TM		 1186 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1187 if (ret < 0)
1188 goto out;
7d52e862 1189 }
d529ef83
JL		 1190
1191 /*
1192 * We must clear NFS_INO_INVALID_DATA first to ensure that
1193 * invalidations that come in while we're shooting down the mappings
1194 * are respected. But, that leaves a race window where one revalidator
1195 * can clear the flag, and then another checks it before the mapping
1196 * gets invalidated. Fix that by serializing access to this part of
1197 * the function.
1198 *
1199 * At the same time, we need to allow other tasks to see whether we
1200 * might be in the middle of invalidating the pages, so we only set
1201 * the bit lock here if it looks like we're going to be doing that.
1202 */
1203 for (;;) {
74316201
N		 1204 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1205 nfs_wait_bit_killable, TASK_KILLABLE);
d529ef83
JL		 1206 if (ret)
1207 goto out;
17dfeb91
TM		 1208 spin_lock(&inode->i_lock);
1209 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1210 spin_unlock(&inode->i_lock);
1211 continue;
1212 }
1213 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
d529ef83 1214 break;
d529ef83 1215 spin_unlock(&inode->i_lock);
17dfeb91 1216 goto out;
f4ce1299
TM		 1217 }
1218
17dfeb91 1219 set_bit(NFS_INO_INVALIDATING, bitlock);
4db72b40 1220 smp_wmb();
17dfeb91
TM		 1221 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1222 spin_unlock(&inode->i_lock);
1223 trace_nfs_invalidate_mapping_enter(inode);
be527494 1224 ret = nfs_invalidate_mapping(inode, mapping);
17dfeb91
TM		 1225 trace_nfs_invalidate_mapping_exit(inode, ret);
1226
d529ef83 1227 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
4e857c58 1228 smp_mb__after_atomic();
d529ef83 1229 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
cd9ae2b6 1230out:
44b11874 1231 return ret;
7d52e862
TM		 1232}
1233
ca0daa27 1234static bool nfs_file_has_writers(struct nfs_inode *nfsi)
874f9463 1235{
ca0daa27
TM		 1236 struct inode *inode = &nfsi->vfs_inode;
1237
1238 assert_spin_locked(&inode->i_lock);
1239
1240 if (!S_ISREG(inode->i_mode))
1241 return false;
1242 if (list_empty(&nfsi->open_files))
1243 return false;
1244 /* Note: This relies on nfsi->open_files being ordered with writers
1245 * being placed at the head of the list.
1246 * See nfs_inode_attach_open_context()
1247 */
1248 return (list_first_entry(&nfsi->open_files,
1249 struct nfs_open_context,
1250 list)->mode & FMODE_WRITE) == FMODE_WRITE;
874f9463
TM		 1251}
1252
651b0e70 1253static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
874f9463 1254{
651b0e70 1255 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
874f9463
TM		 1256}
1257
27dc1cd3 1258static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
a895b4a1
TM		 1259{
1260 struct nfs_inode *nfsi = NFS_I(inode);
27dc1cd3 1261 unsigned long ret = 0;
a895b4a1 1262
9e6e70f8
TM		 1263 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1264 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
a9a4a87a
TM		 1265 && inode->i_version == fattr->pre_change_attr) {
1266 inode->i_version = fattr->change_attr;
70ca8852 1267 if (S_ISDIR(inode->i_mode))
6edf9609 1268 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
27dc1cd3 1269 ret |= NFS_INO_INVALID_ATTR;
70ca8852 1270 }
a895b4a1 1271 /* If we have atomic WCC data, we may update some attributes */
9e6e70f8
TM		 1272 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1273 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
27dc1cd3
TM		 1274 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1275 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1276 ret |= NFS_INO_INVALID_ATTR;
1277 }
9e6e70f8
TM		 1278
1279 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1280 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1281 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
27dc1cd3
TM		 1282 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1283 if (S_ISDIR(inode->i_mode))
6edf9609 1284 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
27dc1cd3 1285 ret |= NFS_INO_INVALID_ATTR;
a895b4a1 1286 }
9e6e70f8
TM		 1287 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1288 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1289 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
cb1410c7 1290 && nfsi->nrequests == 0) {
27dc1cd3
TM		 1291 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1292 ret |= NFS_INO_INVALID_ATTR;
1293 }
de242c0b 1294
27dc1cd3 1295 return ret;
a895b4a1
TM		 1296}
1297
1da177e4 1298/**
33801147 1299 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1da177e4
LT		 1300 * @inode - pointer to inode
1301 * @fattr - updated attributes
1302 *
1303 * Verifies the attribute cache. If we have just changed the attributes,
1304 * so that fattr carries weak cache consistency data, then it may
1305 * also update the ctime/mtime/change_attribute.
1306 */
33801147 1307static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1da177e4
LT		 1308{
1309 struct nfs_inode *nfsi = NFS_I(inode);
1310 loff_t cur_size, new_isize;
2a3f5fd4 1311 unsigned long invalid = 0;
1da177e4 1312
dc59250c 1313
01da47bd
TM		 1314 if (nfs_have_delegated_attributes(inode))
1315 return 0;
ca62b9c3 1316 /* Has the inode gone and changed behind our back? */
9e6e70f8
TM		 1317 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1318 return -EIO;
1319 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
ca62b9c3 1320 return -EIO;
ca62b9c3 1321
651b0e70 1322 if (!nfs_file_has_buffered_writers(nfsi)) {
ca0daa27
TM		 1323 /* Verify a few of the more important attributes */
1324 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && inode->i_version != fattr->change_attr)
1325 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_REVAL_PAGECACHE;
1da177e4 1326
ca0daa27
TM		 1327 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1328 invalid |= NFS_INO_INVALID_ATTR;
ca62b9c3 1329
ca0daa27
TM		 1330 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&inode->i_ctime, &fattr->ctime))
1331 invalid |= NFS_INO_INVALID_ATTR;
1332
1333 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1334 cur_size = i_size_read(inode);
1335 new_isize = nfs_size_to_loff_t(fattr->size);
1336 if (cur_size != new_isize)
1337 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1338 }
9e6e70f8 1339 }
1da177e4
LT		 1340
1341 /* Have any file permissions changed? */
9e6e70f8
TM		 1342 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1343 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
9ff593c4 1344 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
9e6e70f8 1345 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
9ff593c4 1346 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
2a3f5fd4 1347 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1da177e4
LT		 1348
1349 /* Has the link count changed? */
9e6e70f8 1350 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
2a3f5fd4 1351 invalid |= NFS_INO_INVALID_ATTR;
1da177e4 1352
9e6e70f8 1353 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
2a3f5fd4
TM		 1354 invalid |= NFS_INO_INVALID_ATIME;
1355
1356 if (invalid != 0)
1ad13dbc 1357 nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED);
1da177e4 1358
33801147 1359 nfsi->read_cache_jiffies = fattr->time_start;
1da177e4
LT		 1360 return 0;
1361}
1362
ae05f269 1363static atomic_long_t nfs_attr_generation_counter;
4704f0e2
TM		 1364
1365static unsigned long nfs_read_attr_generation_counter(void)
1366{
ae05f269 1367 return atomic_long_read(&nfs_attr_generation_counter);
4704f0e2
TM		 1368}
1369
1370unsigned long nfs_inc_attr_generation_counter(void)
1371{
ae05f269 1372 return atomic_long_inc_return(&nfs_attr_generation_counter);
4704f0e2 1373}
3235b403 1374EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
4704f0e2
TM		 1375
1376void nfs_fattr_init(struct nfs_fattr *fattr)
1377{
1378 fattr->valid = 0;
1379 fattr->time_start = jiffies;
1380 fattr->gencount = nfs_inc_attr_generation_counter();
6926afd1
TM		 1381 fattr->owner_name = NULL;
1382 fattr->group_name = NULL;
4704f0e2 1383}
ddda8e0a 1384EXPORT_SYMBOL_GPL(nfs_fattr_init);
4704f0e2 1385
140e049c
TM		 1386/**
1387 * nfs_fattr_set_barrier
1388 * @fattr: attributes
1389 *
1390 * Used to set a barrier after an attribute was updated. This
1391 * barrier ensures that older attributes from RPC calls that may
1392 * have raced with our update cannot clobber these new values.
1393 * Note that you are still responsible for ensuring that other
1394 * operations which change the attribute on the server do not
1395 * collide.
1396 */
1397void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1398{
1399 fattr->gencount = nfs_inc_attr_generation_counter();
1400}
1401
2d36bfde
TM		 1402struct nfs_fattr *nfs_alloc_fattr(void)
1403{
1404 struct nfs_fattr *fattr;
1405
1406 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1407 if (fattr != NULL)
1408 nfs_fattr_init(fattr);
1409 return fattr;
1410}
ddda8e0a 1411EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
2d36bfde
TM		 1412
1413struct nfs_fh *nfs_alloc_fhandle(void)
1414{
1415 struct nfs_fh *fh;
1416
1417 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1418 if (fh != NULL)
1419 fh->size = 0;
1420 return fh;
1421}
ddda8e0a 1422EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
2d36bfde 1423
e27d359e 1424#ifdef NFS_DEBUG
d8e0539e
WAA		 1425/*
1426 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1427 * in the same way that wireshark does
1428 *
1429 * @fh: file handle
1430 *
1431 * For debugging only.
1432 */
1433u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1434{
1435 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1436 * not on the result */
1264a2f0 1437 return nfs_fhandle_hash(fh);
d8e0539e 1438}
9e6ee76d 1439EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
d8e0539e
WAA		 1440
1441/*
20d27e92
CL		 1442 * _nfs_display_fhandle - display an NFS file handle on the console
1443 *
1444 * @fh: file handle to display
1445 * @caption: display caption
1446 *
1447 * For debugging only.
1448 */
20d27e92
CL		 1449void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1450{
1451 unsigned short i;
1452
fa68a1ba 1453 if (fh == NULL || fh->size == 0) {
20d27e92
CL		 1454 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1455 return;
1456 }
1457
d8e0539e
WAA		 1458 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1459 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
20d27e92
CL		 1460 for (i = 0; i < fh->size; i += 16) {
1461 __be32 *pos = (__be32 *)&fh->data[i];
1462
1463 switch ((fh->size - i - 1) >> 2) {
1464 case 0:
1465 printk(KERN_DEFAULT " %08x\n",
1466 be32_to_cpup(pos));
1467 break;
1468 case 1:
1469 printk(KERN_DEFAULT " %08x %08x\n",
1470 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1471 break;
1472 case 2:
1473 printk(KERN_DEFAULT " %08x %08x %08x\n",
1474 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1475 be32_to_cpup(pos + 2));
1476 break;
1477 default:
1478 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1479 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1480 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1481 }
1482 }
1483}
9e6ee76d 1484EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
20d27e92
CL		 1485#endif
1486
a10ad176
TM		 1487/**
1488 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1489 * @inode - pointer to inode
1490 * @fattr - attributes
1491 *
1492 * Attempt to divine whether or not an RPC call reply carrying stale
1493 * attributes got scheduled after another call carrying updated ones.
1494 *
1495 * To do so, the function first assumes that a more recent ctime means
1496 * that the attributes in fattr are newer, however it also attempt to
1497 * catch the case where ctime either didn't change, or went backwards
1498 * (if someone reset the clock on the server) by looking at whether
1499 * or not this RPC call was started after the inode was last updated.
4704f0e2 1500 * Note also the check for wraparound of 'attr_gencount'
a10ad176
TM		 1501 *
1502 * The function returns 'true' if it thinks the attributes in 'fattr' are
1503 * more recent than the ones cached in the inode.
1504 *
1505 */
1506static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1507{
1508 const struct nfs_inode *nfsi = NFS_I(inode);
1509
4704f0e2 1510 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
4704f0e2 1511 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
a10ad176
TM		 1512}
1513
1514static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1515{
f4ce1299
TM		 1516 int ret;
1517
1518 trace_nfs_refresh_inode_enter(inode);
1519
a10ad176 1520 if (nfs_inode_attrs_need_update(inode, fattr))
f4ce1299
TM		 1521 ret = nfs_update_inode(inode, fattr);
1522 else
1523 ret = nfs_check_inode_attributes(inode, fattr);
1524
1525 trace_nfs_refresh_inode_exit(inode, ret);
1526 return ret;
870a5be8
TM		 1527}
1528
33801147
TM		 1529/**
1530 * nfs_refresh_inode - try to update the inode attribute cache
1531 * @inode - pointer to inode
1532 * @fattr - updated attributes
1533 *
1534 * Check that an RPC call that returned attributes has not overlapped with
1535 * other recent updates of the inode metadata, then decide whether it is
1536 * safe to do a full update of the inode attributes, or whether just to
1537 * call nfs_check_inode_attributes.
1538 */
1539int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1540{
33801147
TM		 1541 int status;
1542
1543 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1544 return 0;
1545 spin_lock(&inode->i_lock);
870a5be8 1546 status = nfs_refresh_inode_locked(inode, fattr);
33801147 1547 spin_unlock(&inode->i_lock);
ef79c097 1548
33801147
TM		 1549 return status;
1550}
ddda8e0a 1551EXPORT_SYMBOL_GPL(nfs_refresh_inode);
33801147 1552
d65f557f
TM		 1553static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1554{
ca0daa27 1555 unsigned long invalid = NFS_INO_INVALID_ATTR;
d65f557f 1556
6edf9609
TM		 1557 if (S_ISDIR(inode->i_mode))
1558 invalid |= NFS_INO_INVALID_DATA;
1559 nfs_set_cache_invalid(inode, invalid);
d65f557f
TM		 1560 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1561 return 0;
1562 return nfs_refresh_inode_locked(inode, fattr);
1563}
1564
decf491f
TM		 1565/**
1566 * nfs_post_op_update_inode - try to update the inode attribute cache
1567 * @inode - pointer to inode
1568 * @fattr - updated attributes
1569 *
1570 * After an operation that has changed the inode metadata, mark the
1571 * attribute cache as being invalid, then try to update it.
f551e44f
CL		 1572 *
1573 * NB: if the server didn't return any post op attributes, this
1574 * function will force the retrieval of attributes before the next
1575 * NFS request. Thus it should be used only for operations that
1576 * are expected to change one or more attributes, to avoid
1577 * unnecessary NFS requests and trips through nfs_update_inode().
decf491f
TM		 1578 */
1579int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1580{
d65f557f 1581 int status;
decf491f 1582
7668fdbe 1583 spin_lock(&inode->i_lock);
92d64e47 1584 nfs_fattr_set_barrier(fattr);
d65f557f 1585 status = nfs_post_op_update_inode_locked(inode, fattr);
7668fdbe 1586 spin_unlock(&inode->i_lock);
aa9c2669 1587
870a5be8 1588 return status;
decf491f 1589}
1c606fb7 1590EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
decf491f 1591
70ca8852 1592/**
a08a8cd3 1593 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
70ca8852
TM		 1594 * @inode - pointer to inode
1595 * @fattr - updated attributes
1596 *
1597 * After an operation that has changed the inode metadata, mark the
1598 * attribute cache as being invalid, then try to update it. Fake up
1599 * weak cache consistency data, if none exist.
1600 *
1601 * This function is mainly designed to be used by the ->write_done() functions.
1602 */
a08a8cd3 1603int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
70ca8852 1604{
d65f557f
TM		 1605 int status;
1606
d65f557f
TM		 1607 /* Don't do a WCC update if these attributes are already stale */
1608 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1609 !nfs_inode_attrs_need_update(inode, fattr)) {
9e6e70f8
TM		 1610 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1611 | NFS_ATTR_FATTR_PRESIZE
1612 | NFS_ATTR_FATTR_PREMTIME
1613 | NFS_ATTR_FATTR_PRECTIME);
d65f557f
TM		 1614 goto out_noforce;
1615 }
9e6e70f8
TM		 1616 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1617 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
a9a4a87a 1618 fattr->pre_change_attr = inode->i_version;
9e6e70f8 1619 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
70ca8852 1620 }
9e6e70f8
TM		 1621 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1622 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
70ca8852 1623 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
9e6e70f8
TM		 1624 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1625 }
1626 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1627 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
70ca8852 1628 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
9e6e70f8
TM		 1629 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1630 }
1631 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1632 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
a3d01454 1633 fattr->pre_size = i_size_read(inode);
9e6e70f8 1634 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
70ca8852 1635 }
d65f557f
TM		 1636out_noforce:
1637 status = nfs_post_op_update_inode_locked(inode, fattr);
a08a8cd3
TM		 1638 return status;
1639}
1640
1641/**
1642 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1643 * @inode - pointer to inode
1644 * @fattr - updated attributes
1645 *
1646 * After an operation that has changed the inode metadata, mark the
1647 * attribute cache as being invalid, then try to update it. Fake up
1648 * weak cache consistency data, if none exist.
1649 *
1650 * This function is mainly designed to be used by the ->write_done() functions.
1651 */
1652int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1653{
1654 int status;
1655
1656 spin_lock(&inode->i_lock);
8f8ba1d7 1657 nfs_fattr_set_barrier(fattr);
a08a8cd3 1658 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
d65f557f
TM		 1659 spin_unlock(&inode->i_lock);
1660 return status;
70ca8852 1661}
ddda8e0a 1662EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
70ca8852 1663
ea96d1ec
AS		 1664
1665static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1666 struct nfs_fattr *fattr)
1667{
1668 bool ret1 = true, ret2 = true;
1669
1670 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1671 ret1 = (nfsi->fileid == fattr->fileid);
1672 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1673 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1674 return ret1 || ret2;
1675}
1676
1da177e4
LT		 1677/*
1678 * Many nfs protocol calls return the new file attributes after
1679 * an operation. Here we update the inode to reflect the state
1680 * of the server's inode.
1681 *
1682 * This is a bit tricky because we have to make sure all dirty pages
1683 * have been sent off to the server before calling invalidate_inode_pages.
1684 * To make sure no other process adds more write requests while we try
1685 * our best to flush them, we make them sleep during the attribute refresh.
1686 *
1687 * A very similar scenario holds for the dir cache.
1688 */
24aa1fe6 1689static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1da177e4 1690{
8b4bdcf8 1691 struct nfs_server *server;
1da177e4 1692 struct nfs_inode *nfsi = NFS_I(inode);
951a143b 1693 loff_t cur_isize, new_isize;
2a3f5fd4 1694 unsigned long invalid = 0;
3e7d950a 1695 unsigned long now = jiffies;
62ab460c 1696 unsigned long save_cache_validity;
651b0e70 1697 bool have_writers = nfs_file_has_buffered_writers(nfsi);
944171cb 1698 bool cache_revalidated = true;
1da177e4 1699
1e8968c5 1700 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
3110ff80 1701 __func__, inode->i_sb->s_id, inode->i_ino,
4f1abd22 1702 nfs_display_fhandle_hash(NFS_FH(inode)),
1da177e4
LT		 1703 atomic_read(&inode->i_count), fattr->valid);
1704
ea96d1ec 1705 if (!nfs_fileid_valid(nfsi, fattr)) {
e73e6c9e
MT		 1706 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1707 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1708 NFS_SERVER(inode)->nfs_client->cl_hostname,
1709 inode->i_sb->s_id, (long long)nfsi->fileid,
1710 (long long)fattr->fileid);
1711 goto out_err;
1712 }
1da177e4
LT		 1713
1714 /*
1715 * Make sure the inode's type hasn't changed.
1716 */
e73e6c9e
MT		 1717 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1718 /*
1719 * Big trouble! The inode has become a different object.
1720 */
1e8968c5 1721 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
e73e6c9e
MT		 1722 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1723 goto out_err;
1724 }
1da177e4 1725
8b4bdcf8 1726 server = NFS_SERVER(inode);
a0356862 1727 /* Update the fsid? */
9e6e70f8 1728 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
c37dcd33 1729 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
36d43a43 1730 !IS_AUTOMOUNT(inode))
8b4bdcf8
TM		 1731 server->fsid = fattr->fsid;
1732
1da177e4
LT		 1733 /*
1734 * Update the read time so we don't revalidate too often.
1735 */
33801147 1736 nfsi->read_cache_jiffies = fattr->time_start;
3e7d950a 1737
62ab460c
TM		 1738 save_cache_validity = nfsi->cache_validity;
1739 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1740 | NFS_INO_INVALID_ATIME
1741 | NFS_INO_REVAL_FORCED
1742 | NFS_INO_REVAL_PAGECACHE);
1da177e4 1743
a895b4a1 1744 /* Do atomic weak cache consistency updates */
27dc1cd3 1745 invalid |= nfs_wcc_update_inode(inode, fattr);
a895b4a1 1746
944171cb
BC		 1747 if (pnfs_layoutcommit_outstanding(inode)) {
1748 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1749 cache_revalidated = false;
1750 }
10b7e9ad 1751
47aabaa7 1752 /* More cache consistency checks */
9e6e70f8 1753 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
a9a4a87a 1754 if (inode->i_version != fattr->change_attr) {
9e6e70f8
TM		 1755 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1756 inode->i_sb->s_id, inode->i_ino);
38512aa9 1757 /* Could it be a race with writeback? */
ca0daa27 1758 if (!have_writers) {
38512aa9
TM		 1759 invalid |= NFS_INO_INVALID_ATTR
1760 | NFS_INO_INVALID_DATA
1761 | NFS_INO_INVALID_ACCESS
1762 | NFS_INO_INVALID_ACL;
1763 if (S_ISDIR(inode->i_mode))
1764 nfs_force_lookup_revalidate(inode);
1765 }
a9a4a87a 1766 inode->i_version = fattr->change_attr;
9e6e70f8 1767 }
ade14a7d 1768 } else {
43b6535e 1769 nfsi->cache_validity |= save_cache_validity;
ade14a7d
TM		 1770 cache_revalidated = false;
1771 }
9e6e70f8
TM		 1772
1773 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
fee7fe19 1774 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
ade14a7d 1775 } else if (server->caps & NFS_CAP_MTIME) {
43b6535e
TM		 1776 nfsi->cache_validity |= save_cache_validity &
1777 (NFS_INO_INVALID_ATTR
62ab460c 1778 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1779 cache_revalidated = false;
1780 }
62ab460c 1781
9e6e70f8 1782 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
fee7fe19 1783 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
ade14a7d 1784 } else if (server->caps & NFS_CAP_CTIME) {
43b6535e
TM		 1785 nfsi->cache_validity |= save_cache_validity &
1786 (NFS_INO_INVALID_ATTR
62ab460c 1787 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1788 cache_revalidated = false;
1789 }
47aabaa7 1790
951a143b 1791 /* Check if our cached file size is stale */
9e6e70f8
TM		 1792 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1793 new_isize = nfs_size_to_loff_t(fattr->size);
1794 cur_isize = i_size_read(inode);
1795 if (new_isize != cur_isize) {
1796 /* Do we perhaps have any outstanding writes, or has
1797 * the file grown beyond our last write? */
ca0daa27 1798 if (nfsi->nrequests == 0 || new_isize > cur_isize) {
9e6e70f8 1799 i_size_write(inode, new_isize);
ca0daa27
TM		 1800 if (!have_writers)
1801 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
9e6e70f8 1802 }
60c16ea8
HJ		 1803 dprintk("NFS: isize change on server for file %s/%ld "
1804 "(%Ld to %Ld)\n",
1805 inode->i_sb->s_id,
1806 inode->i_ino,
1807 (long long)cur_isize,
1808 (long long)new_isize);
1da177e4 1809 }
ade14a7d 1810 } else {
43b6535e
TM		 1811 nfsi->cache_validity |= save_cache_validity &
1812 (NFS_INO_INVALID_ATTR
62ab460c
TM		 1813 | NFS_INO_REVAL_PAGECACHE
1814 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1815 cache_revalidated = false;
1816 }
1da177e4 1817
1da177e4 1818
9e6e70f8
TM		 1819 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1820 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
ade14a7d 1821 else if (server->caps & NFS_CAP_ATIME) {
43b6535e
TM		 1822 nfsi->cache_validity |= save_cache_validity &
1823 (NFS_INO_INVALID_ATIME
62ab460c 1824 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1825 cache_revalidated = false;
1826 }
1da177e4 1827
9e6e70f8
TM		 1828 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1829 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
9b4b3513
TM		 1830 umode_t newmode = inode->i_mode & S_IFMT;
1831 newmode |= fattr->mode & S_IALLUGO;
1832 inode->i_mode = newmode;
9e6e70f8 1833 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
9e6e70f8 1834 }
ade14a7d 1835 } else if (server->caps & NFS_CAP_MODE) {
43b6535e
TM		 1836 nfsi->cache_validity |= save_cache_validity &
1837 (NFS_INO_INVALID_ATTR
62ab460c
TM		 1838 | NFS_INO_INVALID_ACCESS
1839 | NFS_INO_INVALID_ACL
1840 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1841 cache_revalidated = false;
1842 }
62ab460c 1843
9e6e70f8 1844 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
9ff593c4 1845 if (!uid_eq(inode->i_uid, fattr->uid)) {
9e6e70f8
TM		 1846 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1847 inode->i_uid = fattr->uid;
1848 }
ade14a7d 1849 } else if (server->caps & NFS_CAP_OWNER) {
43b6535e
TM		 1850 nfsi->cache_validity |= save_cache_validity &
1851 (NFS_INO_INVALID_ATTR
62ab460c
TM		 1852 | NFS_INO_INVALID_ACCESS
1853 | NFS_INO_INVALID_ACL
1854 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1855 cache_revalidated = false;
1856 }
62ab460c 1857
9e6e70f8 1858 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
9ff593c4 1859 if (!gid_eq(inode->i_gid, fattr->gid)) {
9e6e70f8
TM		 1860 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1861 inode->i_gid = fattr->gid;
1862 }
ade14a7d 1863 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
43b6535e
TM		 1864 nfsi->cache_validity |= save_cache_validity &
1865 (NFS_INO_INVALID_ATTR
62ab460c
TM		 1866 | NFS_INO_INVALID_ACCESS
1867 | NFS_INO_INVALID_ACL
1868 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1869 cache_revalidated = false;
1870 }
921615f1 1871
9e6e70f8
TM		 1872 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1873 if (inode->i_nlink != fattr->nlink) {
1874 invalid |= NFS_INO_INVALID_ATTR;
1875 if (S_ISDIR(inode->i_mode))
1876 invalid |= NFS_INO_INVALID_DATA;
bfe86848 1877 set_nlink(inode, fattr->nlink);
9e6e70f8 1878 }
ade14a7d 1879 } else if (server->caps & NFS_CAP_NLINK) {
43b6535e
TM		 1880 nfsi->cache_validity |= save_cache_validity &
1881 (NFS_INO_INVALID_ATTR
62ab460c 1882 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1883 cache_revalidated = false;
1884 }
1da177e4 1885
9e6e70f8 1886 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 1887 /*
1888 * report the blocks in 512byte units
1889 */
1890 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
ade14a7d 1891 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
9e6e70f8 1892 inode->i_blocks = fattr->du.nfs2.blocks;
ade14a7d
TM		 1893 else
1894 cache_revalidated = false;
1da177e4
LT		 1895
1896 /* Update attrtimeo value if we're out of the unstable period */
fd1defc2 1897 if (invalid & NFS_INO_INVALID_ATTR) {
91d5b470 1898 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1da177e4 1899 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
3e7d950a 1900 nfsi->attrtimeo_timestamp = now;
f5062003 1901 /* Set barrier to be more recent than all outstanding updates */
4704f0e2 1902 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
6d2b2966 1903 } else {
ade14a7d
TM		 1904 if (cache_revalidated) {
1905 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
1906 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1907 nfsi->attrtimeo <<= 1;
1908 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
1909 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1910 }
6d2b2966
TM		 1911 nfsi->attrtimeo_timestamp = now;
1912 }
f5062003
TM		 1913 /* Set the barrier to be more recent than this fattr */
1914 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
1915 nfsi->attr_gencount = fattr->gencount;
1da177e4 1916 }
c812012f
JL		 1917
1918 /* Don't declare attrcache up to date if there were no attrs! */
ade14a7d 1919 if (cache_revalidated)
c812012f
JL		 1920 invalid &= ~NFS_INO_INVALID_ATTR;
1921
1da177e4
LT		 1922 /* Don't invalidate the data if we were to blame */
1923 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1924 || S_ISLNK(inode->i_mode)))
1925 invalid &= ~NFS_INO_INVALID_DATA;
011e2a7f 1926 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
62ab460c 1927 (save_cache_validity & NFS_INO_REVAL_FORCED))
6edf9609 1928 nfs_set_cache_invalid(inode, invalid);
de242c0b 1929
1da177e4 1930 return 0;
b37b03b7 1931 out_err:
1da177e4
LT		 1932 /*
1933 * No need to worry about unhashing the dentry, as the
1934 * lookup validation will know that the inode is bad.
1935 * (But we fall through to invalidate the caches.)
1936 */
1937 nfs_invalidate_inode(inode);
1da177e4
LT		 1938 return -ESTALE;
1939}
1940
f7b422b1 1941struct inode *nfs_alloc_inode(struct super_block *sb)
1da177e4
LT		 1942{
1943 struct nfs_inode *nfsi;
c456aacf 1944 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1da177e4
LT		 1945 if (!nfsi)
1946 return NULL;
55296809
CL		 1947 nfsi->flags = 0UL;
1948 nfsi->cache_validity = 0UL;
89d77c8f 1949#if IS_ENABLED(CONFIG_NFS_V4)
e50a1c2e
BF		 1950 nfsi->nfs4_acl = NULL;
1951#endif /* CONFIG_NFS_V4 */
1da177e4
LT		 1952 return &nfsi->vfs_inode;
1953}
89d77c8f 1954EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1da177e4 1955
fa0d7e3d 1956static void nfs_i_callback(struct rcu_head *head)
1da177e4 1957{
fa0d7e3d 1958 struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4
LT		 1959 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1960}
1961
fa0d7e3d
NP		 1962void nfs_destroy_inode(struct inode *inode)
1963{
1964 call_rcu(&inode->i_rcu, nfs_i_callback);
1965}
89d77c8f 1966EXPORT_SYMBOL_GPL(nfs_destroy_inode);
fa0d7e3d 1967
d75d5414
AM		 1968static inline void nfs4_init_once(struct nfs_inode *nfsi)
1969{
89d77c8f 1970#if IS_ENABLED(CONFIG_NFS_V4)
d75d5414
AM		 1971 INIT_LIST_HEAD(&nfsi->open_states);
1972 nfsi->delegation = NULL;
d75d5414 1973 init_rwsem(&nfsi->rwsem);
e5e94017 1974 nfsi->layout = NULL;
d75d5414
AM		 1975#endif
1976}
f7b422b1 1977
51cc5068 1978static void init_once(void *foo)
1da177e4
LT		 1979{
1980 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1981
a35afb83 1982 inode_init_once(&nfsi->vfs_inode);
a35afb83
CL		 1983 INIT_LIST_HEAD(&nfsi->open_files);
1984 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1985 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
ea2cf228 1986 INIT_LIST_HEAD(&nfsi->commit_info.list);
cb1410c7 1987 nfsi->nrequests = 0;
ea2cf228 1988 nfsi->commit_info.ncommit = 0;
1a0de48a 1989 atomic_set(&nfsi->commit_info.rpcs_out, 0);
884be175 1990 init_rwsem(&nfsi->rmdir_sem);
a35afb83 1991 nfs4_init_once(nfsi);
1da177e4 1992}
20c2df83 1993
f7b422b1 1994static int __init nfs_init_inodecache(void)
1da177e4
LT		 1995{
1996 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1997 sizeof(struct nfs_inode),
fffb60f9 1998 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 1999 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 2000 init_once);
1da177e4
LT		 2001 if (nfs_inode_cachep == NULL)
2002 return -ENOMEM;
2003
2004 return 0;
2005}
2006
266bee88 2007static void nfs_destroy_inodecache(void)
1da177e4 2008{
8c0a8537
KS		 2009 /*
2010 * Make sure all delayed rcu free inodes are flushed before we
2011 * destroy cache.
2012 */
2013 rcu_barrier();
1a1d92c1 2014 kmem_cache_destroy(nfs_inode_cachep);
1da177e4
LT		 2015}
2016
5746006f 2017struct workqueue_struct *nfsiod_workqueue;
89d77c8f 2018EXPORT_SYMBOL_GPL(nfsiod_workqueue);
5746006f
TM		 2019
2020/*
2021 * start up the nfsiod workqueue
2022 */
2023static int nfsiod_start(void)
2024{
2025 struct workqueue_struct *wq;
2026 dprintk("RPC: creating workqueue nfsiod\n");
ada609ee 2027 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
5746006f
TM		 2028 if (wq == NULL)
2029 return -ENOMEM;
2030 nfsiod_workqueue = wq;
2031 return 0;
2032}
2033
2034/*
2035 * Destroy the nfsiod workqueue
2036 */
2037static void nfsiod_stop(void)
2038{
2039 struct workqueue_struct *wq;
2040
2041 wq = nfsiod_workqueue;
2042 if (wq == NULL)
2043 return;
2044 nfsiod_workqueue = NULL;
2045 destroy_workqueue(wq);
2046}
2047
c7d03a00 2048unsigned int nfs_net_id;
9e2e74db 2049EXPORT_SYMBOL_GPL(nfs_net_id);
1b340d01
SK		 2050
2051static int nfs_net_init(struct net *net)
2052{
6b13168b 2053 nfs_clients_init(net);
65b38851 2054 return nfs_fs_proc_net_init(net);
1b340d01
SK		 2055}
2056
2057static void nfs_net_exit(struct net *net)
2058{
65b38851 2059 nfs_fs_proc_net_exit(net);
28cd1b3f 2060 nfs_cleanup_cb_ident_idr(net);
1b340d01
SK		 2061}
2062
2063static struct pernet_operations nfs_net_ops = {
2064 .init = nfs_net_init,
2065 .exit = nfs_net_exit,
2066 .id = &nfs_net_id,
2067 .size = sizeof(struct nfs_net),
2068};
2069
1da177e4
LT		 2070/*
2071 * Initialize NFS
2072 */
2073static int __init init_nfs_fs(void)
2074{
2075 int err;
2076
1b340d01 2077 err = register_pernet_subsys(&nfs_net_ops);
e571cbf1 2078 if (err < 0)
89d77c8f 2079 goto out9;
e571cbf1 2080
8ec442ae
DH		 2081 err = nfs_fscache_register();
2082 if (err < 0)
89d77c8f 2083 goto out8;
8ec442ae 2084
5746006f
TM		 2085 err = nfsiod_start();
2086 if (err)
89d77c8f 2087 goto out7;
5746006f 2088
6aaca566
DH		 2089 err = nfs_fs_proc_init();
2090 if (err)
89d77c8f 2091 goto out6;
6aaca566 2092
1da177e4
LT		 2093 err = nfs_init_nfspagecache();
2094 if (err)
89d77c8f 2095 goto out5;
1da177e4
LT		 2096
2097 err = nfs_init_inodecache();
2098 if (err)
89d77c8f 2099 goto out4;
1da177e4
LT		 2100
2101 err = nfs_init_readpagecache();
2102 if (err)
89d77c8f 2103 goto out3;
1da177e4
LT		 2104
2105 err = nfs_init_writepagecache();
2106 if (err)
89d77c8f 2107 goto out2;
1da177e4 2108
1da177e4
LT		 2109 err = nfs_init_directcache();
2110 if (err)
89d77c8f 2111 goto out1;
1da177e4 2112
ec7652aa 2113 rpc_proc_register(&init_net, &nfs_rpcstat);
cd738ee9
KM		 2114
2115 err = register_nfs_fs();
2116 if (err)
129d1977
BS		 2117 goto out0;
2118
1da177e4 2119 return 0;
129d1977 2120out0:
ec7652aa 2121 rpc_proc_unregister(&init_net, "nfs");
1da177e4 2122 nfs_destroy_directcache();
89d77c8f 2123out1:
129d1977 2124 nfs_destroy_writepagecache();
89d77c8f 2125out2:
129d1977 2126 nfs_destroy_readpagecache();
89d77c8f 2127out3:
129d1977 2128 nfs_destroy_inodecache();
89d77c8f 2129out4:
129d1977 2130 nfs_destroy_nfspagecache();
89d77c8f 2131out5:
129d1977 2132 nfs_fs_proc_exit();
89d77c8f 2133out6:
129d1977 2134 nfsiod_stop();
89d77c8f 2135out7:
129d1977 2136 nfs_fscache_unregister();
89d77c8f 2137out8:
129d1977 2138 unregister_pernet_subsys(&nfs_net_ops);
89d77c8f 2139out9:
1da177e4
LT		 2140 return err;
2141}
2142
2143static void __exit exit_nfs_fs(void)
2144{
1da177e4 2145 nfs_destroy_directcache();
1da177e4
LT		 2146 nfs_destroy_writepagecache();
2147 nfs_destroy_readpagecache();
2148 nfs_destroy_inodecache();
2149 nfs_destroy_nfspagecache();
8ec442ae 2150 nfs_fscache_unregister();
1b340d01 2151 unregister_pernet_subsys(&nfs_net_ops);
ec7652aa 2152 rpc_proc_unregister(&init_net, "nfs");
f7b422b1 2153 unregister_nfs_fs();
6aaca566 2154 nfs_fs_proc_exit();
5746006f 2155 nfsiod_stop();
1da177e4
LT		 2156}
2157
2158/* Not quite true; I just maintain it */
2159MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2160MODULE_LICENSE("GPL");
f43bf0be 2161module_param(enable_ino64, bool, 0644);
1da177e4
LT		 2162
2163module_init(init_nfs_fs)
2164module_exit(exit_nfs_fs)
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