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nfs: Use ida_simple API
[linux-block.git] / fs / nfs / inode.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/nfs/inode.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs inode and superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
1da177e4
LT		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 */
15
1da177e4
LT		 16#include <linux/module.h>
17#include <linux/init.h>
174cd4b1 18#include <linux/sched/signal.h>
1da177e4
LT		 19#include <linux/time.h>
20#include <linux/kernel.h>
21#include <linux/mm.h>
22#include <linux/string.h>
23#include <linux/stat.h>
24#include <linux/errno.h>
25#include <linux/unistd.h>
26#include <linux/sunrpc/clnt.h>
27#include <linux/sunrpc/stats.h>
4ece3a2d 28#include <linux/sunrpc/metrics.h>
1da177e4
LT		 29#include <linux/nfs_fs.h>
30#include <linux/nfs_mount.h>
31#include <linux/nfs4_mount.h>
32#include <linux/lockd/bind.h>
1da177e4
LT		 33#include <linux/seq_file.h>
34#include <linux/mount.h>
1da177e4 35#include <linux/vfs.h>
9cdb3883
MN		 36#include <linux/inet.h>
37#include <linux/nfs_xdr.h>
5a0e3ad6 38#include <linux/slab.h>
3fa0b4e2 39#include <linux/compat.h>
d310310c 40#include <linux/freezer.h>
7c0f6ba6 41#include <linux/uaccess.h>
1eb5d98f 42#include <linux/iversion.h>
1da177e4 43
4ce79717 44#include "nfs4_fs.h"
a72b4422 45#include "callback.h"
1da177e4 46#include "delegation.h"
d9ef5a8c 47#include "iostat.h"
f7b422b1 48#include "internal.h"
8ec442ae 49#include "fscache.h"
e5e94017 50#include "pnfs.h"
ab7017a3 51#include "nfs.h"
1b340d01 52#include "netns.h"
1da177e4 53
f4ce1299
TM		 54#include "nfstrace.h"
55
1da177e4 56#define NFSDBG_FACILITY NFSDBG_VFS
1da177e4 57
f43bf0be
TM		 58#define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
59
60/* Default is to see 64-bit inode numbers */
90ab5ee9 61static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
f43bf0be 62
1da177e4 63static void nfs_invalidate_inode(struct inode *);
24aa1fe6 64static int nfs_update_inode(struct inode *, struct nfs_fattr *);
1da177e4 65
e18b890b 66static struct kmem_cache * nfs_inode_cachep;
b7fa0554 67
1da177e4
LT		 68static inline unsigned long
69nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
70{
71 return nfs_fileid_to_ino_t(fattr->fileid);
72}
73
210c7c17 74static int nfs_wait_killable(int mode)
72cb77f4 75{
416ad3c9 76 freezable_schedule_unsafe();
dfd01f02
PZ		 77 if (signal_pending_state(mode, current))
78 return -ERESTARTSYS;
72cb77f4
TM		 79 return 0;
80}
210c7c17
BC		 81
82int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
83{
84 return nfs_wait_killable(mode);
85}
89d77c8f 86EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
72cb77f4 87
5e4def20 88int nfs_wait_atomic_killable(atomic_t *p, unsigned int mode)
210c7c17 89{
5e4def20 90 return nfs_wait_killable(mode);
210c7c17
BC		 91}
92
f43bf0be
TM		 93/**
94 * nfs_compat_user_ino64 - returns the user-visible inode number
95 * @fileid: 64-bit fileid
96 *
97 * This function returns a 32-bit inode number if the boot parameter
98 * nfs.enable_ino64 is zero.
99 */
100u64 nfs_compat_user_ino64(u64 fileid)
101{
3fa0b4e2
FF		 102#ifdef CONFIG_COMPAT
103 compat_ulong_t ino;
104#else
105 unsigned long ino;
106#endif
f43bf0be
TM		 107
108 if (enable_ino64)
109 return fileid;
110 ino = fileid;
111 if (sizeof(ino) < sizeof(fileid))
112 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
113 return ino;
114}
115
eed99357
TM		 116int nfs_drop_inode(struct inode *inode)
117{
118 return NFS_STALE(inode) || generic_drop_inode(inode);
119}
120EXPORT_SYMBOL_GPL(nfs_drop_inode);
121
19d87ca3 122void nfs_clear_inode(struct inode *inode)
1da177e4 123{
da6d503a
TM		 124 /*
125 * The following should never happen...
126 */
f48407dd
TM		 127 WARN_ON_ONCE(nfs_have_writebacks(inode));
128 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
ada70d94 129 nfs_zap_acl_cache(inode);
1c3c07e9 130 nfs_access_zap_cache(inode);
f1fe29b4 131 nfs_fscache_clear_inode(inode);
1da177e4 132}
89d77c8f 133EXPORT_SYMBOL_GPL(nfs_clear_inode);
1da177e4 134
b57922d9
AV		 135void nfs_evict_inode(struct inode *inode)
136{
91b0abe3 137 truncate_inode_pages_final(&inode->i_data);
dbd5768f 138 clear_inode(inode);
b57922d9
AV		 139 nfs_clear_inode(inode);
140}
141
9e1681c2 142int nfs_sync_inode(struct inode *inode)
4d346bea 143{
95d9f6c3 144 inode_dio_wait(inode);
4d346bea
TM		 145 return nfs_wb_all(inode);
146}
9e1681c2 147EXPORT_SYMBOL_GPL(nfs_sync_inode);
4d346bea 148
29884df0
TM		 149/**
150 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
151 */
152int nfs_sync_mapping(struct address_space *mapping)
153{
5cf95214 154 int ret = 0;
29884df0 155
5cf95214
TM		 156 if (mapping->nrpages != 0) {
157 unmap_mapping_range(mapping, 0, 0, 0);
158 ret = nfs_wb_all(mapping->host);
159 }
29884df0
TM		 160 return ret;
161}
162
187e593d
TM		 163static int nfs_attribute_timeout(struct inode *inode)
164{
165 struct nfs_inode *nfsi = NFS_I(inode);
166
167 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
168}
169
61540bf6
TM		 170static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
171{
172 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
173
174 /* Special case for the pagecache or access cache */
175 if (flags == NFS_INO_REVAL_PAGECACHE &&
176 !(cache_validity & NFS_INO_REVAL_FORCED))
177 return false;
178 return (cache_validity & flags) != 0;
179}
180
181static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
182{
183 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
184
185 if ((cache_validity & flags) != 0)
186 return true;
187 if (nfs_attribute_timeout(inode))
188 return true;
189 return false;
190}
191
192bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
193{
194 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
195 return nfs_check_cache_invalid_delegated(inode, flags);
196
197 return nfs_check_cache_invalid_not_delegated(inode, flags);
198}
199
6edf9609
TM		 200static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
201{
202 struct nfs_inode *nfsi = NFS_I(inode);
d943f2dd 203 bool have_delegation = nfs_have_delegated_attributes(inode);
6edf9609 204
d943f2dd
TM		 205 if (have_delegation)
206 flags &= ~(NFS_INO_INVALID_CHANGE|NFS_INO_REVAL_PAGECACHE);
6edf9609
TM		 207 if (inode->i_mapping->nrpages == 0)
208 flags &= ~NFS_INO_INVALID_DATA;
209 nfsi->cache_validity |= flags;
210 if (flags & NFS_INO_INVALID_DATA)
211 nfs_fscache_invalidate(inode);
212}
213
1da177e4
LT		 214/*
215 * Invalidate the local caches
216 */
b37b03b7 217static void nfs_zap_caches_locked(struct inode *inode)
1da177e4
LT		 218{
219 struct nfs_inode *nfsi = NFS_I(inode);
220 int mode = inode->i_mode;
221
91d5b470
CL		 222 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
223
c7c20973
TM		 224 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
225 nfsi->attrtimeo_timestamp = jiffies;
1da177e4 226
c3f52af3 227 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
de242c0b 228 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
6edf9609 229 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 230 | NFS_INO_INVALID_DATA
231 | NFS_INO_INVALID_ACCESS
232 | NFS_INO_INVALID_ACL
6edf9609 233 | NFS_INO_REVAL_PAGECACHE);
aa9c2669 234 } else
6edf9609 235 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 236 | NFS_INO_INVALID_ACCESS
237 | NFS_INO_INVALID_ACL
6edf9609 238 | NFS_INO_REVAL_PAGECACHE);
fd1defc2 239 nfs_zap_label_cache_locked(nfsi);
b37b03b7 240}
dc59250c 241
b37b03b7
TM		 242void nfs_zap_caches(struct inode *inode)
243{
244 spin_lock(&inode->i_lock);
245 nfs_zap_caches_locked(inode);
dc59250c 246 spin_unlock(&inode->i_lock);
ada70d94
TM		 247}
248
cd9ae2b6
TM		 249void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
250{
251 if (mapping->nrpages != 0) {
252 spin_lock(&inode->i_lock);
6edf9609 253 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
cd9ae2b6
TM		 254 spin_unlock(&inode->i_lock);
255 }
256}
257
f41f7418 258void nfs_zap_acl_cache(struct inode *inode)
ada70d94
TM		 259{
260 void (*clear_acl_cache)(struct inode *);
261
262 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
263 if (clear_acl_cache != NULL)
264 clear_acl_cache(inode);
dc59250c 265 spin_lock(&inode->i_lock);
55296809 266 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
dc59250c 267 spin_unlock(&inode->i_lock);
1da177e4 268}
1c606fb7 269EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
1da177e4 270
c4812998
TM		 271void nfs_invalidate_atime(struct inode *inode)
272{
273 spin_lock(&inode->i_lock);
6edf9609 274 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
c4812998
TM		 275 spin_unlock(&inode->i_lock);
276}
ddda8e0a 277EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
c4812998 278
1da177e4 279/*
b37b03b7
TM		 280 * Invalidate, but do not unhash, the inode.
281 * NB: must be called with inode->i_lock held!
1da177e4 282 */
b37b03b7 283static void nfs_invalidate_inode(struct inode *inode)
1da177e4 284{
3a10c30a 285 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
b37b03b7 286 nfs_zap_caches_locked(inode);
1da177e4
LT		 287}
288
289struct nfs_find_desc {
290 struct nfs_fh *fh;
291 struct nfs_fattr *fattr;
292};
293
294/*
295 * In NFSv3 we can have 64bit inode numbers. In order to support
296 * this, and re-exported directories (also seen in NFSv2)
297 * we are forced to allow 2 different inodes to have the same
298 * i_ino.
299 */
300static int
301nfs_find_actor(struct inode *inode, void *opaque)
302{
303 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
304 struct nfs_fh *fh = desc->fh;
305 struct nfs_fattr *fattr = desc->fattr;
306
307 if (NFS_FILEID(inode) != fattr->fileid)
308 return 0;
f6488c9b
JL		 309 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
310 return 0;
1da177e4
LT		 311 if (nfs_compare_fh(NFS_FH(inode), fh))
312 return 0;
313 if (is_bad_inode(inode) || NFS_STALE(inode))
314 return 0;
315 return 1;
316}
317
318static int
319nfs_init_locked(struct inode *inode, void *opaque)
320{
321 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
322 struct nfs_fattr *fattr = desc->fattr;
323
99fadcd7 324 set_nfs_fileid(inode, fattr->fileid);
916ec34d 325 inode->i_mode = fattr->mode;
1da177e4
LT		 326 nfs_copy_fh(NFS_FH(inode), desc->fh);
327 return 0;
328}
329
e058f70b 330#ifdef CONFIG_NFS_V4_SECURITY_LABEL
fd1defc2
TM		 331static void nfs_clear_label_invalid(struct inode *inode)
332{
333 spin_lock(&inode->i_lock);
334 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
335 spin_unlock(&inode->i_lock);
336}
337
aa9c2669
DQ		 338void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
339 struct nfs4_label *label)
340{
341 int error;
342
343 if (label == NULL)
344 return;
345
aa9c2669
DQ		 346 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
347 error = security_inode_notifysecctx(inode, label->label,
348 label->len);
349 if (error)
350 printk(KERN_ERR "%s() %s %d "
351 "security_inode_notifysecctx() %d\n",
352 __func__,
353 (char *)label->label,
354 label->len, error);
fd1defc2 355 nfs_clear_label_invalid(inode);
aa9c2669
DQ		 356 }
357}
358
e058f70b
SD		 359struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
360{
361 struct nfs4_label *label = NULL;
362 int minor_version = server->nfs_client->cl_minorversion;
363
364 if (minor_version < 2)
365 return label;
366
367 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
368 return label;
369
370 label = kzalloc(sizeof(struct nfs4_label), flags);
371 if (label == NULL)
372 return ERR_PTR(-ENOMEM);
373
374 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
375 if (label->label == NULL) {
376 kfree(label);
377 return ERR_PTR(-ENOMEM);
378 }
379 label->len = NFS4_MAXLABELLEN;
380
381 return label;
382}
383EXPORT_SYMBOL_GPL(nfs4_label_alloc);
aa9c2669 384#else
829e57d7 385void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
aa9c2669
DQ		 386 struct nfs4_label *label)
387{
388}
e058f70b 389#endif
aa9c2669 390EXPORT_SYMBOL_GPL(nfs_setsecurity);
e058f70b 391
f174ff7a
PT		 392/* Search for inode identified by fh, fileid and i_mode in inode cache. */
393struct inode *
394nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
395{
396 struct nfs_find_desc desc = {
397 .fh = fh,
398 .fattr = fattr,
399 };
400 struct inode *inode;
401 unsigned long hash;
402
403 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
404 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
405 return NULL;
406
407 hash = nfs_fattr_to_ino_t(fattr);
408 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
409
410 dprintk("%s: returning %p\n", __func__, inode);
411 return inode;
412}
413
1da177e4
LT		 414/*
415 * This is our front-end to iget that looks up inodes by file handle
416 * instead of inode number.
417 */
418struct inode *
1775fd3e 419nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
1da177e4
LT		 420{
421 struct nfs_find_desc desc = {
422 .fh = fh,
423 .fattr = fattr
424 };
03f28e3a 425 struct inode *inode = ERR_PTR(-ENOENT);
1da177e4
LT		 426 unsigned long hash;
427
7ebb9315
BS		 428 nfs_attr_check_mountpoint(sb, fattr);
429
2ef47eb1
AS		 430 if (nfs_attr_use_mounted_on_fileid(fattr))
431 fattr->fileid = fattr->mounted_on_fileid;
432 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
1da177e4 433 goto out_no_inode;
9e6e70f8 434 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
1da177e4 435 goto out_no_inode;
1da177e4
LT		 436
437 hash = nfs_fattr_to_ino_t(fattr);
438
03f28e3a
TM		 439 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
440 if (inode == NULL) {
441 inode = ERR_PTR(-ENOMEM);
1da177e4 442 goto out_no_inode;
03f28e3a 443 }
1da177e4
LT		 444
445 if (inode->i_state & I_NEW) {
446 struct nfs_inode *nfsi = NFS_I(inode);
b0c4fddc 447 unsigned long now = jiffies;
1da177e4
LT		 448
449 /* We set i_ino for the few things that still rely on it,
450 * such as stat(2) */
451 inode->i_ino = hash;
452
453 /* We can't support update_atime(), since the server will reset it */
454 inode->i_flags |= S_NOATIME|S_NOCMTIME;
455 inode->i_mode = fattr->mode;
62ab460c
TM		 456 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
457 && nfs_server_capable(inode, NFS_CAP_MODE))
16e14375 458 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
1da177e4
LT		 459 /* Why so? Because we want revalidate for devices/FIFOs, and
460 * that's precisely what we have in nfs_file_inode_operations.
461 */
8fa5c000 462 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
1da177e4 463 if (S_ISREG(inode->i_mode)) {
1788ea6e 464 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
1da177e4 465 inode->i_data.a_ops = &nfs_file_aops;
1da177e4 466 } else if (S_ISDIR(inode->i_mode)) {
8fa5c000 467 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
1da177e4 468 inode->i_fop = &nfs_dir_operations;
11de3b11 469 inode->i_data.a_ops = &nfs_dir_aops;
55a97593 470 /* Deal with crossing mountpoints */
7ebb9315
BS		 471 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
472 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
6b97fd3d
MN		 473 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
474 inode->i_op = &nfs_referral_inode_operations;
475 else
476 inode->i_op = &nfs_mountpoint_inode_operations;
55a97593 477 inode->i_fop = NULL;
36d43a43 478 inode->i_flags |= S_AUTOMOUNT;
55a97593 479 }
21fc61c7 480 } else if (S_ISLNK(inode->i_mode)) {
1da177e4 481 inode->i_op = &nfs_symlink_inode_operations;
21fc61c7
AV		 482 inode_nohighmem(inode);
483 } else
1da177e4
LT		 484 init_special_inode(inode, inode->i_mode, fattr->rdev);
485
9e6e70f8
TM		 486 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
487 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
488 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
1eb5d98f 489 inode_set_iversion_raw(inode, 0);
9e6e70f8 490 inode->i_size = 0;
6d6b77f1 491 clear_nlink(inode);
9ff593c4
EB		 492 inode->i_uid = make_kuid(&init_user_ns, -2);
493 inode->i_gid = make_kgid(&init_user_ns, -2);
9e6e70f8
TM		 494 inode->i_blocks = 0;
495 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
2701d086
AA		 496 nfsi->write_io = 0;
497 nfsi->read_io = 0;
9e6e70f8 498
33801147 499 nfsi->read_cache_jiffies = fattr->time_start;
4704f0e2 500 nfsi->attr_gencount = fattr->gencount;
9e6e70f8
TM		 501 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
502 inode->i_atime = fattr->atime;
62ab460c 503 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
16e14375 504 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
9e6e70f8
TM		 505 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
506 inode->i_mtime = fattr->mtime;
62ab460c 507 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
16e14375 508 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
9e6e70f8
TM		 509 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
510 inode->i_ctime = fattr->ctime;
62ab460c 511 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
16e14375 512 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
9e6e70f8 513 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1eb5d98f 514 inode_set_iversion_raw(inode, fattr->change_attr);
cd812599 515 else
16e14375 516 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
9e6e70f8
TM		 517 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
518 inode->i_size = nfs_size_to_loff_t(fattr->size);
62ab460c 519 else
16e14375 520 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
9e6e70f8 521 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
bfe86848 522 set_nlink(inode, fattr->nlink);
62ab460c 523 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
16e14375 524 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 525 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
526 inode->i_uid = fattr->uid;
62ab460c 527 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
16e14375 528 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 529 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
530 inode->i_gid = fattr->gid;
62ab460c 531 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
16e14375 532 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 533 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
534 inode->i_blocks = fattr->du.nfs2.blocks;
535 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 536 /*
537 * report the blocks in 512byte units
538 */
539 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1da177e4 540 }
aa9c2669
DQ		 541
542 nfs_setsecurity(inode, fattr, label);
543
1da177e4 544 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
b0c4fddc 545 nfsi->attrtimeo_timestamp = now;
1c3c07e9 546 nfsi->access_cache = RB_ROOT;
1da177e4 547
f1fe29b4 548 nfs_fscache_init_inode(inode);
ef79c097 549
1da177e4 550 unlock_new_inode(inode);
26fde4df
N		 551 } else {
552 int err = nfs_refresh_inode(inode, fattr);
553 if (err < 0) {
554 iput(inode);
555 inode = ERR_PTR(err);
556 goto out_no_inode;
557 }
558 }
1e8968c5 559 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
1da177e4 560 inode->i_sb->s_id,
1e8968c5 561 (unsigned long long)NFS_FILEID(inode),
4f1abd22 562 nfs_display_fhandle_hash(fh),
1da177e4
LT		 563 atomic_read(&inode->i_count));
564
565out:
566 return inode;
567
568out_no_inode:
03f28e3a 569 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
1da177e4
LT		 570 goto out;
571}
89d77c8f 572EXPORT_SYMBOL_GPL(nfs_fhget);
1da177e4 573
536e43d1 574#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		 575
576int
577nfs_setattr(struct dentry *dentry, struct iattr *attr)
578{
2b0143b5 579 struct inode *inode = d_inode(dentry);
987f8dfc 580 struct nfs_fattr *fattr;
ae57ca0f 581 int error = 0;
1da177e4 582
91d5b470
CL		 583 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
584
188b95dd
JL		 585 /* skip mode change if it's just for clearing setuid/setgid */
586 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
587 attr->ia_valid &= ~ATTR_MODE;
588
1da177e4 589 if (attr->ia_valid & ATTR_SIZE) {
08a899d5
CH		 590 BUG_ON(!S_ISREG(inode->i_mode));
591
ae57ca0f
KM		 592 error = inode_newsize_ok(inode, attr->ia_size);
593 if (error)
594 return error;
595
596 if (attr->ia_size == i_size_read(inode))
1da177e4
LT		 597 attr->ia_valid &= ~ATTR_SIZE;
598 }
599
600 /* Optimization: if the end result is no change, don't RPC */
601 attr->ia_valid &= NFS_VALID_ATTRS;
536e43d1 602 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
1da177e4
LT		 603 return 0;
604
f4ce1299
TM		 605 trace_nfs_setattr_enter(inode);
606
755c1e20 607 /* Write all dirty data */
4d346bea
TM		 608 if (S_ISREG(inode->i_mode))
609 nfs_sync_inode(inode);
987f8dfc
TM		 610
611 fattr = nfs_alloc_fattr();
ae57ca0f
KM		 612 if (fattr == NULL) {
613 error = -ENOMEM;
987f8dfc 614 goto out;
ae57ca0f
KM		 615 }
616
987f8dfc 617 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
65e4308d 618 if (error == 0)
aa9c2669 619 error = nfs_refresh_inode(inode, fattr);
987f8dfc
TM		 620 nfs_free_fattr(fattr);
621out:
f4ce1299 622 trace_nfs_setattr_exit(inode, error);
65e4308d
TM		 623 return error;
624}
ddda8e0a 625EXPORT_SYMBOL_GPL(nfs_setattr);
65e4308d 626
a3d01454
TM		 627/**
628 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
629 * @inode: inode of the file used
630 * @offset: file offset to start truncating
631 *
632 * This is a copy of the common vmtruncate, but with the locking
633 * corrected to take into account the fact that NFS requires
634 * inode->i_size to be updated under the inode->i_lock.
f044636d 635 * Note: must be called with inode->i_lock held!
a3d01454
TM		 636 */
637static int nfs_vmtruncate(struct inode * inode, loff_t offset)
638{
c08d3b0e 639 int err;
a3d01454 640
c08d3b0e 641 err = inode_newsize_ok(inode, offset);
642 if (err)
643 goto out;
a3d01454 644
c08d3b0e 645 i_size_write(inode, offset);
6edf9609
TM		 646 /* Optimisation */
647 if (offset == 0)
648 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
c08d3b0e 649
f044636d 650 spin_unlock(&inode->i_lock);
7caef267 651 truncate_pagecache(inode, offset);
f044636d 652 spin_lock(&inode->i_lock);
c08d3b0e 653out:
654 return err;
a3d01454
TM		 655}
656
65e4308d
TM		 657/**
658 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
659 * @inode: pointer to struct inode
660 * @attr: pointer to struct iattr
16e14375 661 * @fattr: pointer to struct nfs_fattr
65e4308d
TM		 662 *
663 * Note: we do this in the *proc.c in order to ensure that
664 * it works for things like exclusive creates too.
665 */
f044636d
TM		 666void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
667 struct nfs_fattr *fattr)
65e4308d 668{
f044636d
TM		 669 /* Barrier: bump the attribute generation count. */
670 nfs_fattr_set_barrier(fattr);
671
672 spin_lock(&inode->i_lock);
673 NFS_I(inode)->attr_gencount = fattr->gencount;
16e14375
TM		 674 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
675 | NFS_INO_INVALID_CTIME);
65e4308d 676 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
1da177e4 677 if ((attr->ia_valid & ATTR_MODE) != 0) {
65e4308d
TM		 678 int mode = attr->ia_mode & S_IALLUGO;
679 mode |= inode->i_mode & ~S_IALLUGO;
1da177e4
LT		 680 inode->i_mode = mode;
681 }
682 if ((attr->ia_valid & ATTR_UID) != 0)
683 inode->i_uid = attr->ia_uid;
684 if ((attr->ia_valid & ATTR_GID) != 0)
685 inode->i_gid = attr->ia_gid;
6edf9609
TM		 686 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
687 | NFS_INO_INVALID_ACL);
65e4308d
TM		 688 }
689 if ((attr->ia_valid & ATTR_SIZE) != 0) {
16e14375 690 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
91d5b470 691 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
a3d01454 692 nfs_vmtruncate(inode, attr->ia_size);
65e4308d 693 }
616c3196
JL		 694 if (fattr->valid)
695 nfs_update_inode(inode, fattr);
f044636d 696 spin_unlock(&inode->i_lock);
1da177e4 697}
ddda8e0a 698EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
1da177e4 699
1bcf4c5c 700static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
311324ad
TM		 701{
702 struct dentry *parent;
703
1bcf4c5c
TM		 704 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
705 return;
311324ad 706 parent = dget_parent(dentry);
2b0143b5 707 nfs_force_use_readdirplus(d_inode(parent));
311324ad
TM		 708 dput(parent);
709}
710
1bcf4c5c
TM		 711static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
712{
713 struct dentry *parent;
714
715 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
716 return;
717 parent = dget_parent(dentry);
718 nfs_advise_use_readdirplus(d_inode(parent));
719 dput(parent);
720}
721
311324ad
TM		 722static bool nfs_need_revalidate_inode(struct inode *inode)
723{
724 if (NFS_I(inode)->cache_validity &
725 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
726 return true;
727 if (nfs_attribute_cache_expired(inode))
728 return true;
729 return false;
730}
731
a528d35e
DH		 732int nfs_getattr(const struct path *path, struct kstat *stat,
733 u32 request_mask, unsigned int query_flags)
1da177e4 734{
a528d35e 735 struct inode *inode = d_inode(path->dentry);
9ccee940
TM		 736 struct nfs_server *server = NFS_SERVER(inode);
737 unsigned long cache_validity;
16caf5b6 738 int err = 0;
9ccee940
TM		 739 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
740 bool do_update = false;
1da177e4 741
f4ce1299 742 trace_nfs_getattr_enter(inode);
9ccee940
TM		 743
744 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync)
745 goto out_no_update;
746
acdc53b2 747 /* Flush out writes to the server in order to update c/mtime. */
9ccee940
TM		 748 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
749 S_ISREG(inode->i_mode)) {
79566ef0 750 err = filemap_write_and_wait(inode->i_mapping);
acdc53b2
TM		 751 if (err)
752 goto out;
28c494c5 753 }
fc33a7bb
CH		 754
755 /*
756 * We may force a getattr if the user cares about atime.
757 *
758 * Note that we only have to check the vfsmount flags here:
759 * - NFS always sets S_NOATIME by so checking it would give a
760 * bogus result
1751e8a6 761 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
fc33a7bb
CH		 762 * no point in checking those.
763 */
a528d35e
DH		 764 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
765 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
9ccee940
TM		 766 request_mask &= ~STATX_ATIME;
767
768 /* Is the user requesting attributes that might need revalidation? */
769 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
770 STATX_MTIME|STATX_UID|STATX_GID|
771 STATX_SIZE|STATX_BLOCKS)))
772 goto out_no_revalidate;
773
774 /* Check whether the cached attributes are stale */
775 do_update |= force_sync || nfs_attribute_cache_expired(inode);
776 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
777 do_update |= cache_validity &
778 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
779 if (request_mask & STATX_ATIME)
780 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
781 if (request_mask & (STATX_CTIME|STATX_MTIME))
782 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
783 if (do_update) {
784 /* Update the attribute cache */
59b86d85
HT		 785 if (!(server->flags & NFS_MOUNT_NOAC))
786 nfs_readdirplus_parent_cache_miss(path->dentry);
787 else
788 nfs_readdirplus_parent_cache_hit(path->dentry);
311324ad 789 err = __nfs_revalidate_inode(server, inode);
9ccee940
TM		 790 if (err)
791 goto out;
1bcf4c5c 792 } else
a528d35e 793 nfs_readdirplus_parent_cache_hit(path->dentry);
9ccee940
TM		 794out_no_revalidate:
795 /* Only return attributes that were revalidated. */
796 stat->result_mask &= request_mask;
797out_no_update:
798 generic_fillattr(inode, stat);
799 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
800 if (S_ISDIR(inode->i_mode))
801 stat->blksize = NFS_SERVER(inode)->dtsize;
acdc53b2 802out:
f4ce1299 803 trace_nfs_getattr_exit(inode, err);
1da177e4
LT		 804 return err;
805}
ddda8e0a 806EXPORT_SYMBOL_GPL(nfs_getattr);
1da177e4 807
f11ac8db
TM		 808static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
809{
2f62b5aa 810 refcount_set(&l_ctx->count, 1);
d51fdb87 811 l_ctx->lockowner = current->files;
f11ac8db 812 INIT_LIST_HEAD(&l_ctx->list);
210c7c17 813 atomic_set(&l_ctx->io_count, 0);
f11ac8db
TM		 814}
815
816static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
817{
8c86899f
TM		 818 struct nfs_lock_context *head = &ctx->lock_context;
819 struct nfs_lock_context *pos = head;
f11ac8db 820
8c86899f 821 do {
d51fdb87 822 if (pos->lockowner != current->files)
f11ac8db 823 continue;
2f62b5aa 824 refcount_inc(&pos->count);
f11ac8db 825 return pos;
8c86899f 826 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
f11ac8db
TM		 827 return NULL;
828}
829
830struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
831{
832 struct nfs_lock_context *res, *new = NULL;
2b0143b5 833 struct inode *inode = d_inode(ctx->dentry);
f11ac8db
TM		 834
835 spin_lock(&inode->i_lock);
836 res = __nfs_find_lock_context(ctx);
837 if (res == NULL) {
838 spin_unlock(&inode->i_lock);
839 new = kmalloc(sizeof(*new), GFP_KERNEL);
840 if (new == NULL)
b3c54de6 841 return ERR_PTR(-ENOMEM);
f11ac8db
TM		 842 nfs_init_lock_context(new);
843 spin_lock(&inode->i_lock);
844 res = __nfs_find_lock_context(ctx);
845 if (res == NULL) {
846 list_add_tail(&new->list, &ctx->lock_context.list);
847 new->open_context = ctx;
848 res = new;
849 new = NULL;
850 }
851 }
852 spin_unlock(&inode->i_lock);
853 kfree(new);
854 return res;
855}
1c6dcbe5 856EXPORT_SYMBOL_GPL(nfs_get_lock_context);
f11ac8db
TM		 857
858void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
859{
860 struct nfs_open_context *ctx = l_ctx->open_context;
2b0143b5 861 struct inode *inode = d_inode(ctx->dentry);
f11ac8db 862
2f62b5aa 863 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
f11ac8db
TM		 864 return;
865 list_del(&l_ctx->list);
866 spin_unlock(&inode->i_lock);
867 kfree(l_ctx);
868}
1c6dcbe5 869EXPORT_SYMBOL_GPL(nfs_put_lock_context);
f11ac8db 870
7fe5c398
TM		 871/**
872 * nfs_close_context - Common close_context() routine NFSv2/v3
873 * @ctx: pointer to context
874 * @is_sync: is this a synchronous close
875 *
5cf9d706
TM		 876 * Ensure that the attributes are up to date if we're mounted
877 * with close-to-open semantics and we have cached data that will
878 * need to be revalidated on open.
7fe5c398
TM		 879 */
880void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
881{
5cf9d706 882 struct nfs_inode *nfsi;
7fe5c398
TM		 883 struct inode *inode;
884 struct nfs_server *server;
885
886 if (!(ctx->mode & FMODE_WRITE))
887 return;
888 if (!is_sync)
889 return;
2b0143b5 890 inode = d_inode(ctx->dentry);
58ff4184
TM		 891 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
892 return;
5cf9d706
TM		 893 nfsi = NFS_I(inode);
894 if (inode->i_mapping->nrpages == 0)
895 return;
896 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
897 return;
898 if (!list_empty(&nfsi->open_files))
7fe5c398
TM		 899 return;
900 server = NFS_SERVER(inode);
901 if (server->flags & NFS_MOUNT_NOCTO)
902 return;
903 nfs_revalidate_inode(server, inode);
904}
ddda8e0a 905EXPORT_SYMBOL_GPL(nfs_close_context);
7fe5c398 906
532d4def
N		 907struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
908 fmode_t f_mode,
909 struct file *filp)
1da177e4
LT		 910{
911 struct nfs_open_context *ctx;
5ede7b1c
AV		 912 struct rpc_cred *cred = rpc_lookup_cred();
913 if (IS_ERR(cred))
914 return ERR_CAST(cred);
1da177e4 915
f52720ca 916 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
5ede7b1c
AV		 917 if (!ctx) {
918 put_rpccred(cred);
919 return ERR_PTR(-ENOMEM);
1da177e4 920 }
5ede7b1c
AV		 921 nfs_sb_active(dentry->d_sb);
922 ctx->dentry = dget(dentry);
923 ctx->cred = cred;
924 ctx->state = NULL;
925 ctx->mode = f_mode;
926 ctx->flags = 0;
927 ctx->error = 0;
532d4def 928 ctx->flock_owner = (fl_owner_t)filp;
5ede7b1c
AV		 929 nfs_init_lock_context(&ctx->lock_context);
930 ctx->lock_context.open_context = ctx;
931 INIT_LIST_HEAD(&ctx->list);
82be417a 932 ctx->mdsthreshold = NULL;
1da177e4
LT		 933 return ctx;
934}
89d77c8f 935EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1da177e4
LT		 936
937struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
938{
939 if (ctx != NULL)
2f62b5aa 940 refcount_inc(&ctx->lock_context.count);
1da177e4
LT		 941 return ctx;
942}
89d77c8f 943EXPORT_SYMBOL_GPL(get_nfs_open_context);
1da177e4 944
7fe5c398 945static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1da177e4 946{
2b0143b5 947 struct inode *inode = d_inode(ctx->dentry);
3d4ff43d 948 struct super_block *sb = ctx->dentry->d_sb;
3bec63db 949
5c78f58e 950 if (!list_empty(&ctx->list)) {
2f62b5aa 951 if (!refcount_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
ef84303e
BH		 952 return;
953 list_del(&ctx->list);
954 spin_unlock(&inode->i_lock);
2f62b5aa 955 } else if (!refcount_dec_and_test(&ctx->lock_context.count))
5e11934d 956 return;
5c78f58e
TM		 957 if (inode != NULL)
958 NFS_PROTO(inode)->close_context(ctx, is_sync);
3bec63db
TM		 959 if (ctx->cred != NULL)
960 put_rpccred(ctx->cred);
3d4ff43d 961 dput(ctx->dentry);
322b2b90 962 nfs_sb_deactive(sb);
82be417a 963 kfree(ctx->mdsthreshold);
3bec63db
TM		 964 kfree(ctx);
965}
966
a49c3c77
TM		 967void put_nfs_open_context(struct nfs_open_context *ctx)
968{
969 __put_nfs_open_context(ctx, 0);
970}
89d77c8f 971EXPORT_SYMBOL_GPL(put_nfs_open_context);
a49c3c77 972
4eae5014
TM		 973static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
974{
975 __put_nfs_open_context(ctx, 1);
976}
977
1da177e4
LT		 978/*
979 * Ensure that mmap has a recent RPC credential for use when writing out
980 * shared pages
981 */
c45ffdd2 982void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1da177e4 983{
2b0143b5 984 struct inode *inode = d_inode(ctx->dentry);
1da177e4
LT		 985 struct nfs_inode *nfsi = NFS_I(inode);
986
1da177e4 987 spin_lock(&inode->i_lock);
ca0daa27
TM		 988 if (ctx->mode & FMODE_WRITE)
989 list_add(&ctx->list, &nfsi->open_files);
990 else
991 list_add_tail(&ctx->list, &nfsi->open_files);
1da177e4
LT		 992 spin_unlock(&inode->i_lock);
993}
c45ffdd2
TM		 994EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
995
996void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
997{
998 filp->private_data = get_nfs_open_context(ctx);
999 if (list_empty(&ctx->list))
1000 nfs_inode_attach_open_context(ctx);
1001}
89d77c8f 1002EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1da177e4 1003
d530838b
TM		 1004/*
1005 * Given an inode, search for an open context with the desired characteristics
1006 */
dc0b027d 1007struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
1da177e4
LT		 1008{
1009 struct nfs_inode *nfsi = NFS_I(inode);
1010 struct nfs_open_context *pos, *ctx = NULL;
1011
1012 spin_lock(&inode->i_lock);
1013 list_for_each_entry(pos, &nfsi->open_files, list) {
d530838b
TM		 1014 if (cred != NULL && pos->cred != cred)
1015 continue;
1544fa0f
TM		 1016 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1017 continue;
1018 ctx = get_nfs_open_context(pos);
1019 break;
1da177e4
LT		 1020 }
1021 spin_unlock(&inode->i_lock);
1022 return ctx;
1023}
1024
aff8d8dc 1025void nfs_file_clear_open_context(struct file *filp)
1da177e4 1026{
cd3758e3 1027 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1da177e4
LT		 1028
1029 if (ctx) {
2b0143b5 1030 struct inode *inode = d_inode(ctx->dentry);
c45ffdd2 1031
0bcbf039
PT		 1032 /*
1033 * We fatal error on write before. Try to writeback
1034 * every page again.
1035 */
1036 if (ctx->error < 0)
1037 invalidate_inode_pages2(inode->i_mapping);
1da177e4
LT		 1038 filp->private_data = NULL;
1039 spin_lock(&inode->i_lock);
1040 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
1041 spin_unlock(&inode->i_lock);
4eae5014 1042 put_nfs_open_context_sync(ctx);
1da177e4
LT		 1043 }
1044}
1045
1046/*
1047 * These allocate and release file read/write context information.
1048 */
1049int nfs_open(struct inode *inode, struct file *filp)
1050{
1051 struct nfs_open_context *ctx;
1da177e4 1052
532d4def 1053 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
5ede7b1c
AV		 1054 if (IS_ERR(ctx))
1055 return PTR_ERR(ctx);
1da177e4
LT		 1056 nfs_file_set_open_context(filp, ctx);
1057 put_nfs_open_context(ctx);
f1fe29b4 1058 nfs_fscache_open_file(inode, filp);
1da177e4
LT		 1059 return 0;
1060}
1061
1da177e4
LT		 1062/*
1063 * This function is called whenever some part of NFS notices that
1064 * the cached attributes have to be refreshed.
1065 */
1066int
1067__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1068{
1069 int status = -ESTALE;
1775fd3e 1070 struct nfs4_label *label = NULL;
a3cba2aa 1071 struct nfs_fattr *fattr = NULL;
1da177e4 1072 struct nfs_inode *nfsi = NFS_I(inode);
1da177e4 1073
1e8968c5
NV		 1074 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1075 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1da177e4 1076
f4ce1299
TM		 1077 trace_nfs_revalidate_inode_enter(inode);
1078
85233a7a 1079 if (is_bad_inode(inode))
691beb13 1080 goto out;
1da177e4 1081 if (NFS_STALE(inode))
412d582e 1082 goto out;
7fdc49c4 1083
ac46bd37
TM		 1084 /* pNFS: Attributes aren't updated until we layoutcommit */
1085 if (S_ISREG(inode->i_mode)) {
1086 status = pnfs_sync_inode(inode, false);
1087 if (status)
1088 goto out;
1089 }
1090
a3cba2aa
TM		 1091 status = -ENOMEM;
1092 fattr = nfs_alloc_fattr();
1093 if (fattr == NULL)
1094 goto out;
1095
691beb13 1096 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
14c43f76
DQ		 1097
1098 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1099 if (IS_ERR(label)) {
1100 status = PTR_ERR(label);
1101 goto out;
1102 }
1103
1775fd3e 1104 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
1da177e4 1105 if (status != 0) {
1e8968c5 1106 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1da177e4 1107 inode->i_sb->s_id,
1e8968c5 1108 (unsigned long long)NFS_FILEID(inode), status);
1da177e4
LT		 1109 if (status == -ESTALE) {
1110 nfs_zap_caches(inode);
1111 if (!S_ISDIR(inode->i_mode))
3a10c30a 1112 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1da177e4 1113 }
14c43f76 1114 goto err_out;
1da177e4
LT		 1115 }
1116
a3cba2aa 1117 status = nfs_refresh_inode(inode, fattr);
1da177e4 1118 if (status) {
1e8968c5 1119 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1da177e4 1120 inode->i_sb->s_id,
1e8968c5 1121 (unsigned long long)NFS_FILEID(inode), status);
14c43f76 1122 goto err_out;
1da177e4 1123 }
55296809 1124
24aa1fe6 1125 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
ada70d94 1126 nfs_zap_acl_cache(inode);
55296809 1127
3da580aa
JL		 1128 nfs_setsecurity(inode, fattr, label);
1129
1e8968c5 1130 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1da177e4 1131 inode->i_sb->s_id,
1e8968c5 1132 (unsigned long long)NFS_FILEID(inode));
1da177e4 1133
14c43f76
DQ		 1134err_out:
1135 nfs4_label_free(label);
1136out:
a3cba2aa 1137 nfs_free_fattr(fattr);
f4ce1299 1138 trace_nfs_revalidate_inode_exit(inode, status);
1da177e4
LT		 1139 return status;
1140}
1141
43f291cd 1142int nfs_attribute_cache_expired(struct inode *inode)
d7cf8dd0 1143{
b4d2314b 1144 if (nfs_have_delegated_attributes(inode))
1da177e4 1145 return 0;
d7cf8dd0 1146 return nfs_attribute_timeout(inode);
1da177e4
LT		 1147}
1148
1149/**
1150 * nfs_revalidate_inode - Revalidate the inode attributes
1151 * @server - pointer to nfs_server struct
1152 * @inode - pointer to inode struct
1153 *
1154 * Updates inode attribute information by retrieving the data from the server.
1155 */
1156int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1157{
311324ad 1158 if (!nfs_need_revalidate_inode(inode))
1da177e4
LT		 1159 return NFS_STALE(inode) ? -ESTALE : 0;
1160 return __nfs_revalidate_inode(server, inode);
1161}
1c606fb7 1162EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1da177e4 1163
1cda707d 1164static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
717d44e8
TM		 1165{
1166 struct nfs_inode *nfsi = NFS_I(inode);
f8806c84
TM		 1167 int ret;
1168
717d44e8 1169 if (mapping->nrpages != 0) {
f8806c84
TM		 1170 if (S_ISREG(inode->i_mode)) {
1171 ret = nfs_sync_mapping(mapping);
1172 if (ret < 0)
1173 return ret;
1174 }
1175 ret = invalidate_inode_pages2(mapping);
717d44e8
TM		 1176 if (ret < 0)
1177 return ret;
1178 }
d529ef83
JL		 1179 if (S_ISDIR(inode->i_mode)) {
1180 spin_lock(&inode->i_lock);
717d44e8 1181 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
d529ef83
JL		 1182 spin_unlock(&inode->i_lock);
1183 }
717d44e8 1184 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
de242c0b 1185 nfs_fscache_wait_on_invalidate(inode);
f4ce1299 1186
1e8968c5
NV		 1187 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1188 inode->i_sb->s_id,
1189 (unsigned long long)NFS_FILEID(inode));
717d44e8
TM		 1190 return 0;
1191}
1192
1cd9cb05 1193bool nfs_mapping_need_revalidate_inode(struct inode *inode)
b4b1eadf 1194{
61540bf6
TM		 1195 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1196 NFS_STALE(inode);
b4b1eadf
TM		 1197}
1198
0d0def49
AV		 1199int nfs_revalidate_mapping_rcu(struct inode *inode)
1200{
1201 struct nfs_inode *nfsi = NFS_I(inode);
1202 unsigned long *bitlock = &nfsi->flags;
1203 int ret = 0;
1204
1205 if (IS_SWAPFILE(inode))
1206 goto out;
1207 if (nfs_mapping_need_revalidate_inode(inode)) {
1208 ret = -ECHILD;
1209 goto out;
1210 }
1211 spin_lock(&inode->i_lock);
1212 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1213 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1214 ret = -ECHILD;
1215 spin_unlock(&inode->i_lock);
1216out:
1217 return ret;
1218}
1219
717d44e8 1220/**
be527494 1221 * nfs_revalidate_mapping - Revalidate the pagecache
717d44e8
TM		 1222 * @inode - pointer to host inode
1223 * @mapping - pointer to mapping
717d44e8 1224 */
be527494
TM		 1225int nfs_revalidate_mapping(struct inode *inode,
1226 struct address_space *mapping)
717d44e8
TM		 1227{
1228 struct nfs_inode *nfsi = NFS_I(inode);
d529ef83 1229 unsigned long *bitlock = &nfsi->flags;
717d44e8 1230 int ret = 0;
dc59250c 1231
29418aa4
MG		 1232 /* swapfiles are not supposed to be shared. */
1233 if (IS_SWAPFILE(inode))
1234 goto out;
1235
b4b1eadf 1236 if (nfs_mapping_need_revalidate_inode(inode)) {
717d44e8
TM		 1237 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1238 if (ret < 0)
1239 goto out;
7d52e862 1240 }
d529ef83
JL		 1241
1242 /*
1243 * We must clear NFS_INO_INVALID_DATA first to ensure that
1244 * invalidations that come in while we're shooting down the mappings
1245 * are respected. But, that leaves a race window where one revalidator
1246 * can clear the flag, and then another checks it before the mapping
1247 * gets invalidated. Fix that by serializing access to this part of
1248 * the function.
1249 *
1250 * At the same time, we need to allow other tasks to see whether we
1251 * might be in the middle of invalidating the pages, so we only set
1252 * the bit lock here if it looks like we're going to be doing that.
1253 */
1254 for (;;) {
74316201
N		 1255 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1256 nfs_wait_bit_killable, TASK_KILLABLE);
d529ef83
JL		 1257 if (ret)
1258 goto out;
17dfeb91
TM		 1259 spin_lock(&inode->i_lock);
1260 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1261 spin_unlock(&inode->i_lock);
1262 continue;
1263 }
1264 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
d529ef83 1265 break;
d529ef83 1266 spin_unlock(&inode->i_lock);
17dfeb91 1267 goto out;
f4ce1299
TM		 1268 }
1269
17dfeb91 1270 set_bit(NFS_INO_INVALIDATING, bitlock);
4db72b40 1271 smp_wmb();
17dfeb91
TM		 1272 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1273 spin_unlock(&inode->i_lock);
1274 trace_nfs_invalidate_mapping_enter(inode);
be527494 1275 ret = nfs_invalidate_mapping(inode, mapping);
17dfeb91
TM		 1276 trace_nfs_invalidate_mapping_exit(inode, ret);
1277
d529ef83 1278 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
4e857c58 1279 smp_mb__after_atomic();
d529ef83 1280 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
cd9ae2b6 1281out:
44b11874 1282 return ret;
7d52e862
TM		 1283}
1284
ca0daa27 1285static bool nfs_file_has_writers(struct nfs_inode *nfsi)
874f9463 1286{
ca0daa27
TM		 1287 struct inode *inode = &nfsi->vfs_inode;
1288
1289 assert_spin_locked(&inode->i_lock);
1290
1291 if (!S_ISREG(inode->i_mode))
1292 return false;
1293 if (list_empty(&nfsi->open_files))
1294 return false;
1295 /* Note: This relies on nfsi->open_files being ordered with writers
1296 * being placed at the head of the list.
1297 * See nfs_inode_attach_open_context()
1298 */
1299 return (list_first_entry(&nfsi->open_files,
1300 struct nfs_open_context,
1301 list)->mode & FMODE_WRITE) == FMODE_WRITE;
874f9463
TM		 1302}
1303
651b0e70 1304static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
874f9463 1305{
651b0e70 1306 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
874f9463
TM		 1307}
1308
783b194c 1309static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
a895b4a1 1310{
9e6e70f8
TM		 1311 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1312 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
c472c07b 1313 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1eb5d98f 1314 inode_set_iversion_raw(inode, fattr->change_attr);
70ca8852 1315 if (S_ISDIR(inode->i_mode))
6edf9609 1316 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
70ca8852 1317 }
a895b4a1 1318 /* If we have atomic WCC data, we may update some attributes */
9e6e70f8
TM		 1319 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1320 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
27dc1cd3
TM		 1321 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1322 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
27dc1cd3 1323 }
9e6e70f8
TM		 1324
1325 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1326 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1327 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
27dc1cd3
TM		 1328 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1329 if (S_ISDIR(inode->i_mode))
6edf9609 1330 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
a895b4a1 1331 }
9e6e70f8
TM		 1332 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1333 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1334 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
a6b6d5b8 1335 && !nfs_have_writebacks(inode)) {
27dc1cd3 1336 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
27dc1cd3 1337 }
a895b4a1
TM		 1338}
1339
1da177e4 1340/**
33801147 1341 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1da177e4
LT		 1342 * @inode - pointer to inode
1343 * @fattr - updated attributes
1344 *
1345 * Verifies the attribute cache. If we have just changed the attributes,
1346 * so that fattr carries weak cache consistency data, then it may
1347 * also update the ctime/mtime/change_attribute.
1348 */
33801147 1349static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1da177e4
LT		 1350{
1351 struct nfs_inode *nfsi = NFS_I(inode);
1352 loff_t cur_size, new_isize;
2a3f5fd4 1353 unsigned long invalid = 0;
1da177e4 1354
dc59250c 1355
01da47bd
TM		 1356 if (nfs_have_delegated_attributes(inode))
1357 return 0;
ca62b9c3 1358 /* Has the inode gone and changed behind our back? */
9e6e70f8 1359 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
cc89684c 1360 return -ESTALE;
9e6e70f8 1361 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
cc89684c 1362 return -ESTALE;
ca62b9c3 1363
651b0e70 1364 if (!nfs_file_has_buffered_writers(nfsi)) {
ca0daa27 1365 /* Verify a few of the more important attributes */
c472c07b 1366 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
16e14375
TM		 1367 invalid |= NFS_INO_INVALID_CHANGE
1368 | NFS_INO_REVAL_PAGECACHE;
1da177e4 1369
ca0daa27 1370 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
16e14375 1371 invalid |= NFS_INO_INVALID_MTIME;
ca62b9c3 1372
ca0daa27 1373 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&inode->i_ctime, &fattr->ctime))
16e14375 1374 invalid |= NFS_INO_INVALID_CTIME;
ca0daa27
TM		 1375
1376 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1377 cur_size = i_size_read(inode);
1378 new_isize = nfs_size_to_loff_t(fattr->size);
1379 if (cur_size != new_isize)
16e14375
TM		 1380 invalid |= NFS_INO_INVALID_SIZE
1381 | NFS_INO_REVAL_PAGECACHE;
ca0daa27 1382 }
9e6e70f8 1383 }
1da177e4
LT		 1384
1385 /* Have any file permissions changed? */
9e6e70f8 1386 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
16e14375
TM		 1387 invalid |= NFS_INO_INVALID_ACCESS
1388 | NFS_INO_INVALID_ACL
1389 | NFS_INO_INVALID_OTHER;
9ff593c4 1390 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
16e14375
TM		 1391 invalid |= NFS_INO_INVALID_ACCESS
1392 | NFS_INO_INVALID_ACL
1393 | NFS_INO_INVALID_OTHER;
9ff593c4 1394 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
16e14375
TM		 1395 invalid |= NFS_INO_INVALID_ACCESS
1396 | NFS_INO_INVALID_ACL
1397 | NFS_INO_INVALID_OTHER;
1da177e4
LT		 1398
1399 /* Has the link count changed? */
9e6e70f8 1400 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
16e14375 1401 invalid |= NFS_INO_INVALID_OTHER;
1da177e4 1402
9e6e70f8 1403 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
2a3f5fd4
TM		 1404 invalid |= NFS_INO_INVALID_ATIME;
1405
1406 if (invalid != 0)
1ad13dbc 1407 nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED);
1da177e4 1408
33801147 1409 nfsi->read_cache_jiffies = fattr->time_start;
1da177e4
LT		 1410 return 0;
1411}
1412
ae05f269 1413static atomic_long_t nfs_attr_generation_counter;
4704f0e2
TM		 1414
1415static unsigned long nfs_read_attr_generation_counter(void)
1416{
ae05f269 1417 return atomic_long_read(&nfs_attr_generation_counter);
4704f0e2
TM		 1418}
1419
1420unsigned long nfs_inc_attr_generation_counter(void)
1421{
ae05f269 1422 return atomic_long_inc_return(&nfs_attr_generation_counter);
4704f0e2 1423}
3235b403 1424EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
4704f0e2
TM		 1425
1426void nfs_fattr_init(struct nfs_fattr *fattr)
1427{
1428 fattr->valid = 0;
1429 fattr->time_start = jiffies;
1430 fattr->gencount = nfs_inc_attr_generation_counter();
6926afd1
TM		 1431 fattr->owner_name = NULL;
1432 fattr->group_name = NULL;
4704f0e2 1433}
ddda8e0a 1434EXPORT_SYMBOL_GPL(nfs_fattr_init);
4704f0e2 1435
140e049c
TM		 1436/**
1437 * nfs_fattr_set_barrier
1438 * @fattr: attributes
1439 *
1440 * Used to set a barrier after an attribute was updated. This
1441 * barrier ensures that older attributes from RPC calls that may
1442 * have raced with our update cannot clobber these new values.
1443 * Note that you are still responsible for ensuring that other
1444 * operations which change the attribute on the server do not
1445 * collide.
1446 */
1447void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1448{
1449 fattr->gencount = nfs_inc_attr_generation_counter();
1450}
1451
2d36bfde
TM		 1452struct nfs_fattr *nfs_alloc_fattr(void)
1453{
1454 struct nfs_fattr *fattr;
1455
1456 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1457 if (fattr != NULL)
1458 nfs_fattr_init(fattr);
1459 return fattr;
1460}
ddda8e0a 1461EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
2d36bfde
TM		 1462
1463struct nfs_fh *nfs_alloc_fhandle(void)
1464{
1465 struct nfs_fh *fh;
1466
1467 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1468 if (fh != NULL)
1469 fh->size = 0;
1470 return fh;
1471}
ddda8e0a 1472EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
2d36bfde 1473
e27d359e 1474#ifdef NFS_DEBUG
d8e0539e
WAA		 1475/*
1476 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1477 * in the same way that wireshark does
1478 *
1479 * @fh: file handle
1480 *
1481 * For debugging only.
1482 */
1483u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1484{
1485 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1486 * not on the result */
1264a2f0 1487 return nfs_fhandle_hash(fh);
d8e0539e 1488}
9e6ee76d 1489EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
d8e0539e
WAA		 1490
1491/*
20d27e92
CL		 1492 * _nfs_display_fhandle - display an NFS file handle on the console
1493 *
1494 * @fh: file handle to display
1495 * @caption: display caption
1496 *
1497 * For debugging only.
1498 */
20d27e92
CL		 1499void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1500{
1501 unsigned short i;
1502
fa68a1ba 1503 if (fh == NULL || fh->size == 0) {
20d27e92
CL		 1504 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1505 return;
1506 }
1507
d8e0539e
WAA		 1508 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1509 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
20d27e92
CL		 1510 for (i = 0; i < fh->size; i += 16) {
1511 __be32 *pos = (__be32 *)&fh->data[i];
1512
1513 switch ((fh->size - i - 1) >> 2) {
1514 case 0:
1515 printk(KERN_DEFAULT " %08x\n",
1516 be32_to_cpup(pos));
1517 break;
1518 case 1:
1519 printk(KERN_DEFAULT " %08x %08x\n",
1520 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1521 break;
1522 case 2:
1523 printk(KERN_DEFAULT " %08x %08x %08x\n",
1524 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1525 be32_to_cpup(pos + 2));
1526 break;
1527 default:
1528 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1529 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1530 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1531 }
1532 }
1533}
9e6ee76d 1534EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
20d27e92
CL		 1535#endif
1536
a10ad176
TM		 1537/**
1538 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1539 * @inode - pointer to inode
1540 * @fattr - attributes
1541 *
1542 * Attempt to divine whether or not an RPC call reply carrying stale
1543 * attributes got scheduled after another call carrying updated ones.
1544 *
1545 * To do so, the function first assumes that a more recent ctime means
1546 * that the attributes in fattr are newer, however it also attempt to
1547 * catch the case where ctime either didn't change, or went backwards
1548 * (if someone reset the clock on the server) by looking at whether
1549 * or not this RPC call was started after the inode was last updated.
4704f0e2 1550 * Note also the check for wraparound of 'attr_gencount'
a10ad176
TM		 1551 *
1552 * The function returns 'true' if it thinks the attributes in 'fattr' are
1553 * more recent than the ones cached in the inode.
1554 *
1555 */
1556static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1557{
1558 const struct nfs_inode *nfsi = NFS_I(inode);
1559
4704f0e2 1560 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
4704f0e2 1561 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
a10ad176
TM		 1562}
1563
1564static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1565{
f4ce1299
TM		 1566 int ret;
1567
1568 trace_nfs_refresh_inode_enter(inode);
1569
a10ad176 1570 if (nfs_inode_attrs_need_update(inode, fattr))
f4ce1299
TM		 1571 ret = nfs_update_inode(inode, fattr);
1572 else
1573 ret = nfs_check_inode_attributes(inode, fattr);
1574
1575 trace_nfs_refresh_inode_exit(inode, ret);
1576 return ret;
870a5be8
TM		 1577}
1578
33801147
TM		 1579/**
1580 * nfs_refresh_inode - try to update the inode attribute cache
1581 * @inode - pointer to inode
1582 * @fattr - updated attributes
1583 *
1584 * Check that an RPC call that returned attributes has not overlapped with
1585 * other recent updates of the inode metadata, then decide whether it is
1586 * safe to do a full update of the inode attributes, or whether just to
1587 * call nfs_check_inode_attributes.
1588 */
1589int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1590{
33801147
TM		 1591 int status;
1592
1593 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1594 return 0;
1595 spin_lock(&inode->i_lock);
870a5be8 1596 status = nfs_refresh_inode_locked(inode, fattr);
33801147 1597 spin_unlock(&inode->i_lock);
ef79c097 1598
33801147
TM		 1599 return status;
1600}
ddda8e0a 1601EXPORT_SYMBOL_GPL(nfs_refresh_inode);
33801147 1602
16e14375
TM		 1603static int nfs_post_op_update_inode_locked(struct inode *inode,
1604 struct nfs_fattr *fattr, unsigned int invalid)
d65f557f 1605{
6edf9609
TM		 1606 if (S_ISDIR(inode->i_mode))
1607 invalid |= NFS_INO_INVALID_DATA;
1608 nfs_set_cache_invalid(inode, invalid);
d65f557f
TM		 1609 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1610 return 0;
1611 return nfs_refresh_inode_locked(inode, fattr);
1612}
1613
decf491f
TM		 1614/**
1615 * nfs_post_op_update_inode - try to update the inode attribute cache
1616 * @inode - pointer to inode
1617 * @fattr - updated attributes
1618 *
1619 * After an operation that has changed the inode metadata, mark the
1620 * attribute cache as being invalid, then try to update it.
f551e44f
CL		 1621 *
1622 * NB: if the server didn't return any post op attributes, this
1623 * function will force the retrieval of attributes before the next
1624 * NFS request. Thus it should be used only for operations that
1625 * are expected to change one or more attributes, to avoid
1626 * unnecessary NFS requests and trips through nfs_update_inode().
decf491f
TM		 1627 */
1628int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1629{
d65f557f 1630 int status;
decf491f 1631
7668fdbe 1632 spin_lock(&inode->i_lock);
92d64e47 1633 nfs_fattr_set_barrier(fattr);
16e14375
TM		 1634 status = nfs_post_op_update_inode_locked(inode, fattr,
1635 NFS_INO_INVALID_CHANGE
1636 | NFS_INO_INVALID_CTIME);
7668fdbe 1637 spin_unlock(&inode->i_lock);
aa9c2669 1638
870a5be8 1639 return status;
decf491f 1640}
1c606fb7 1641EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
decf491f 1642
70ca8852 1643/**
a08a8cd3 1644 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
70ca8852
TM		 1645 * @inode - pointer to inode
1646 * @fattr - updated attributes
1647 *
1648 * After an operation that has changed the inode metadata, mark the
1649 * attribute cache as being invalid, then try to update it. Fake up
1650 * weak cache consistency data, if none exist.
1651 *
1652 * This function is mainly designed to be used by the ->write_done() functions.
1653 */
a08a8cd3 1654int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
70ca8852 1655{
d65f557f
TM		 1656 int status;
1657
d65f557f
TM		 1658 /* Don't do a WCC update if these attributes are already stale */
1659 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1660 !nfs_inode_attrs_need_update(inode, fattr)) {
9e6e70f8
TM		 1661 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1662 | NFS_ATTR_FATTR_PRESIZE
1663 | NFS_ATTR_FATTR_PREMTIME
1664 | NFS_ATTR_FATTR_PRECTIME);
d65f557f
TM		 1665 goto out_noforce;
1666 }
9e6e70f8
TM		 1667 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1668 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1eb5d98f 1669 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
9e6e70f8 1670 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
70ca8852 1671 }
9e6e70f8
TM		 1672 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1673 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
70ca8852 1674 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
9e6e70f8
TM		 1675 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1676 }
1677 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1678 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
70ca8852 1679 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
9e6e70f8
TM		 1680 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1681 }
1682 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1683 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
a3d01454 1684 fattr->pre_size = i_size_read(inode);
9e6e70f8 1685 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
70ca8852 1686 }
d65f557f 1687out_noforce:
16e14375
TM		 1688 status = nfs_post_op_update_inode_locked(inode, fattr,
1689 NFS_INO_INVALID_CHANGE
1690 | NFS_INO_INVALID_CTIME
1691 | NFS_INO_INVALID_MTIME);
a08a8cd3
TM		 1692 return status;
1693}
1694
1695/**
1696 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1697 * @inode - pointer to inode
1698 * @fattr - updated attributes
1699 *
1700 * After an operation that has changed the inode metadata, mark the
1701 * attribute cache as being invalid, then try to update it. Fake up
1702 * weak cache consistency data, if none exist.
1703 *
1704 * This function is mainly designed to be used by the ->write_done() functions.
1705 */
1706int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1707{
1708 int status;
1709
1710 spin_lock(&inode->i_lock);
8f8ba1d7 1711 nfs_fattr_set_barrier(fattr);
a08a8cd3 1712 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
d65f557f
TM		 1713 spin_unlock(&inode->i_lock);
1714 return status;
70ca8852 1715}
ddda8e0a 1716EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
70ca8852 1717
ea96d1ec
AS		 1718
1719static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1720 struct nfs_fattr *fattr)
1721{
1722 bool ret1 = true, ret2 = true;
1723
1724 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1725 ret1 = (nfsi->fileid == fattr->fileid);
1726 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1727 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1728 return ret1 || ret2;
1729}
1730
1da177e4
LT		 1731/*
1732 * Many nfs protocol calls return the new file attributes after
1733 * an operation. Here we update the inode to reflect the state
1734 * of the server's inode.
1735 *
1736 * This is a bit tricky because we have to make sure all dirty pages
1737 * have been sent off to the server before calling invalidate_inode_pages.
1738 * To make sure no other process adds more write requests while we try
1739 * our best to flush them, we make them sleep during the attribute refresh.
1740 *
1741 * A very similar scenario holds for the dir cache.
1742 */
24aa1fe6 1743static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1da177e4 1744{
8b4bdcf8 1745 struct nfs_server *server;
1da177e4 1746 struct nfs_inode *nfsi = NFS_I(inode);
951a143b 1747 loff_t cur_isize, new_isize;
2a3f5fd4 1748 unsigned long invalid = 0;
3e7d950a 1749 unsigned long now = jiffies;
62ab460c 1750 unsigned long save_cache_validity;
651b0e70 1751 bool have_writers = nfs_file_has_buffered_writers(nfsi);
944171cb 1752 bool cache_revalidated = true;
1da177e4 1753
1e8968c5 1754 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
3110ff80 1755 __func__, inode->i_sb->s_id, inode->i_ino,
4f1abd22 1756 nfs_display_fhandle_hash(NFS_FH(inode)),
1da177e4
LT		 1757 atomic_read(&inode->i_count), fattr->valid);
1758
ea96d1ec 1759 if (!nfs_fileid_valid(nfsi, fattr)) {
e73e6c9e
MT		 1760 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1761 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1762 NFS_SERVER(inode)->nfs_client->cl_hostname,
1763 inode->i_sb->s_id, (long long)nfsi->fileid,
1764 (long long)fattr->fileid);
1765 goto out_err;
1766 }
1da177e4
LT		 1767
1768 /*
1769 * Make sure the inode's type hasn't changed.
1770 */
e73e6c9e
MT		 1771 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1772 /*
1773 * Big trouble! The inode has become a different object.
1774 */
1e8968c5 1775 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
e73e6c9e
MT		 1776 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1777 goto out_err;
1778 }
1da177e4 1779
8b4bdcf8 1780 server = NFS_SERVER(inode);
a0356862 1781 /* Update the fsid? */
9e6e70f8 1782 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
c37dcd33 1783 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
36d43a43 1784 !IS_AUTOMOUNT(inode))
8b4bdcf8
TM		 1785 server->fsid = fattr->fsid;
1786
1da177e4
LT		 1787 /*
1788 * Update the read time so we don't revalidate too often.
1789 */
33801147 1790 nfsi->read_cache_jiffies = fattr->time_start;
3e7d950a 1791
62ab460c
TM		 1792 save_cache_validity = nfsi->cache_validity;
1793 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1794 | NFS_INO_INVALID_ATIME
1795 | NFS_INO_REVAL_FORCED
1796 | NFS_INO_REVAL_PAGECACHE);
1da177e4 1797
a895b4a1 1798 /* Do atomic weak cache consistency updates */
783b194c 1799 nfs_wcc_update_inode(inode, fattr);
a895b4a1 1800
944171cb
BC		 1801 if (pnfs_layoutcommit_outstanding(inode)) {
1802 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1803 cache_revalidated = false;
1804 }
10b7e9ad 1805
47aabaa7 1806 /* More cache consistency checks */
9e6e70f8 1807 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
c472c07b 1808 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
9e6e70f8
TM		 1809 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1810 inode->i_sb->s_id, inode->i_ino);
38512aa9 1811 /* Could it be a race with writeback? */
ca0daa27 1812 if (!have_writers) {
16e14375 1813 invalid |= NFS_INO_INVALID_CHANGE
38512aa9
TM		 1814 | NFS_INO_INVALID_DATA
1815 | NFS_INO_INVALID_ACCESS
1816 | NFS_INO_INVALID_ACL;
cac88f94 1817 /* Force revalidate of all attributes */
16e14375
TM		 1818 save_cache_validity |= NFS_INO_INVALID_CTIME
1819 | NFS_INO_INVALID_MTIME
1820 | NFS_INO_INVALID_SIZE
1821 | NFS_INO_INVALID_OTHER;
38512aa9
TM		 1822 if (S_ISDIR(inode->i_mode))
1823 nfs_force_lookup_revalidate(inode);
1824 }
1eb5d98f 1825 inode_set_iversion_raw(inode, fattr->change_attr);
9e6e70f8 1826 }
ade14a7d 1827 } else {
8619ddd0 1828 nfsi->cache_validity |= save_cache_validity &
16e14375 1829 (NFS_INO_INVALID_CHANGE
8619ddd0
TM		 1830 | NFS_INO_REVAL_PAGECACHE
1831 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1832 cache_revalidated = false;
1833 }
9e6e70f8
TM		 1834
1835 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
fee7fe19 1836 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
ade14a7d 1837 } else if (server->caps & NFS_CAP_MTIME) {
43b6535e 1838 nfsi->cache_validity |= save_cache_validity &
16e14375 1839 (NFS_INO_INVALID_MTIME
62ab460c 1840 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1841 cache_revalidated = false;
1842 }
62ab460c 1843
9e6e70f8 1844 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
fee7fe19 1845 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
ade14a7d 1846 } else if (server->caps & NFS_CAP_CTIME) {
43b6535e 1847 nfsi->cache_validity |= save_cache_validity &
16e14375 1848 (NFS_INO_INVALID_CTIME
62ab460c 1849 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1850 cache_revalidated = false;
1851 }
47aabaa7 1852
951a143b 1853 /* Check if our cached file size is stale */
9e6e70f8
TM		 1854 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1855 new_isize = nfs_size_to_loff_t(fattr->size);
1856 cur_isize = i_size_read(inode);
1857 if (new_isize != cur_isize) {
1858 /* Do we perhaps have any outstanding writes, or has
1859 * the file grown beyond our last write? */
a6b6d5b8 1860 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
9e6e70f8 1861 i_size_write(inode, new_isize);
ca0daa27 1862 if (!have_writers)
16e14375 1863 invalid |= NFS_INO_INVALID_DATA;
9e6e70f8 1864 }
60c16ea8
HJ		 1865 dprintk("NFS: isize change on server for file %s/%ld "
1866 "(%Ld to %Ld)\n",
1867 inode->i_sb->s_id,
1868 inode->i_ino,
1869 (long long)cur_isize,
1870 (long long)new_isize);
1da177e4 1871 }
ade14a7d 1872 } else {
43b6535e 1873 nfsi->cache_validity |= save_cache_validity &
16e14375 1874 (NFS_INO_INVALID_SIZE
62ab460c
TM		 1875 | NFS_INO_REVAL_PAGECACHE
1876 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1877 cache_revalidated = false;
1878 }
1da177e4 1879
1da177e4 1880
9e6e70f8
TM		 1881 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1882 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
ade14a7d 1883 else if (server->caps & NFS_CAP_ATIME) {
43b6535e
TM		 1884 nfsi->cache_validity |= save_cache_validity &
1885 (NFS_INO_INVALID_ATIME
62ab460c 1886 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1887 cache_revalidated = false;
1888 }
1da177e4 1889
9e6e70f8
TM		 1890 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1891 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
9b4b3513
TM		 1892 umode_t newmode = inode->i_mode & S_IFMT;
1893 newmode |= fattr->mode & S_IALLUGO;
1894 inode->i_mode = newmode;
16e14375
TM		 1895 invalid |= NFS_INO_INVALID_ACCESS
1896 | NFS_INO_INVALID_ACL
1897 | NFS_INO_INVALID_OTHER;
9e6e70f8 1898 }
ade14a7d 1899 } else if (server->caps & NFS_CAP_MODE) {
43b6535e 1900 nfsi->cache_validity |= save_cache_validity &
16e14375 1901 (NFS_INO_INVALID_ACCESS
62ab460c 1902 | NFS_INO_INVALID_ACL
16e14375 1903 | NFS_INO_INVALID_OTHER
62ab460c 1904 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1905 cache_revalidated = false;
1906 }
62ab460c 1907
9e6e70f8 1908 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
9ff593c4 1909 if (!uid_eq(inode->i_uid, fattr->uid)) {
16e14375
TM		 1910 invalid |= NFS_INO_INVALID_ACCESS
1911 | NFS_INO_INVALID_ACL
1912 | NFS_INO_INVALID_OTHER;
9e6e70f8
TM		 1913 inode->i_uid = fattr->uid;
1914 }
ade14a7d 1915 } else if (server->caps & NFS_CAP_OWNER) {
43b6535e 1916 nfsi->cache_validity |= save_cache_validity &
16e14375 1917 (NFS_INO_INVALID_ACCESS
62ab460c 1918 | NFS_INO_INVALID_ACL
16e14375 1919 | NFS_INO_INVALID_OTHER
62ab460c 1920 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1921 cache_revalidated = false;
1922 }
62ab460c 1923
9e6e70f8 1924 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
9ff593c4 1925 if (!gid_eq(inode->i_gid, fattr->gid)) {
16e14375
TM		 1926 invalid |= NFS_INO_INVALID_ACCESS
1927 | NFS_INO_INVALID_ACL
1928 | NFS_INO_INVALID_OTHER;
9e6e70f8
TM		 1929 inode->i_gid = fattr->gid;
1930 }
ade14a7d 1931 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
43b6535e 1932 nfsi->cache_validity |= save_cache_validity &
16e14375 1933 (NFS_INO_INVALID_ACCESS
62ab460c 1934 | NFS_INO_INVALID_ACL
16e14375 1935 | NFS_INO_INVALID_OTHER
62ab460c 1936 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1937 cache_revalidated = false;
1938 }
921615f1 1939
9e6e70f8
TM		 1940 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1941 if (inode->i_nlink != fattr->nlink) {
16e14375 1942 invalid |= NFS_INO_INVALID_OTHER;
9e6e70f8
TM		 1943 if (S_ISDIR(inode->i_mode))
1944 invalid |= NFS_INO_INVALID_DATA;
bfe86848 1945 set_nlink(inode, fattr->nlink);
9e6e70f8 1946 }
ade14a7d 1947 } else if (server->caps & NFS_CAP_NLINK) {
43b6535e 1948 nfsi->cache_validity |= save_cache_validity &
16e14375 1949 (NFS_INO_INVALID_OTHER
62ab460c 1950 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1951 cache_revalidated = false;
1952 }
1da177e4 1953
9e6e70f8 1954 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 1955 /*
1956 * report the blocks in 512byte units
1957 */
1958 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
ade14a7d 1959 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
9e6e70f8 1960 inode->i_blocks = fattr->du.nfs2.blocks;
ade14a7d
TM		 1961 else
1962 cache_revalidated = false;
1da177e4
LT		 1963
1964 /* Update attrtimeo value if we're out of the unstable period */
fd1defc2 1965 if (invalid & NFS_INO_INVALID_ATTR) {
cac88f94 1966 invalid &= ~NFS_INO_INVALID_ATTR;
91d5b470 1967 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1da177e4 1968 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
3e7d950a 1969 nfsi->attrtimeo_timestamp = now;
f5062003 1970 /* Set barrier to be more recent than all outstanding updates */
4704f0e2 1971 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
6d2b2966 1972 } else {
ade14a7d
TM		 1973 if (cache_revalidated) {
1974 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
1975 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1976 nfsi->attrtimeo <<= 1;
1977 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
1978 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1979 }
6d2b2966
TM		 1980 nfsi->attrtimeo_timestamp = now;
1981 }
f5062003
TM		 1982 /* Set the barrier to be more recent than this fattr */
1983 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
1984 nfsi->attr_gencount = fattr->gencount;
1da177e4 1985 }
c812012f 1986
1da177e4
LT		 1987 /* Don't invalidate the data if we were to blame */
1988 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1989 || S_ISLNK(inode->i_mode)))
1990 invalid &= ~NFS_INO_INVALID_DATA;
011e2a7f 1991 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
62ab460c 1992 (save_cache_validity & NFS_INO_REVAL_FORCED))
6edf9609 1993 nfs_set_cache_invalid(inode, invalid);
de242c0b 1994
1da177e4 1995 return 0;
b37b03b7 1996 out_err:
1da177e4
LT		 1997 /*
1998 * No need to worry about unhashing the dentry, as the
1999 * lookup validation will know that the inode is bad.
2000 * (But we fall through to invalidate the caches.)
2001 */
2002 nfs_invalidate_inode(inode);
1da177e4
LT		 2003 return -ESTALE;
2004}
2005
f7b422b1 2006struct inode *nfs_alloc_inode(struct super_block *sb)
1da177e4
LT		 2007{
2008 struct nfs_inode *nfsi;
c456aacf 2009 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1da177e4
LT		 2010 if (!nfsi)
2011 return NULL;
55296809
CL		 2012 nfsi->flags = 0UL;
2013 nfsi->cache_validity = 0UL;
89d77c8f 2014#if IS_ENABLED(CONFIG_NFS_V4)
e50a1c2e
BF		 2015 nfsi->nfs4_acl = NULL;
2016#endif /* CONFIG_NFS_V4 */
1da177e4
LT		 2017 return &nfsi->vfs_inode;
2018}
89d77c8f 2019EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1da177e4 2020
fa0d7e3d 2021static void nfs_i_callback(struct rcu_head *head)
1da177e4 2022{
fa0d7e3d 2023 struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4
LT		 2024 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2025}
2026
fa0d7e3d
NP		 2027void nfs_destroy_inode(struct inode *inode)
2028{
2029 call_rcu(&inode->i_rcu, nfs_i_callback);
2030}
89d77c8f 2031EXPORT_SYMBOL_GPL(nfs_destroy_inode);
fa0d7e3d 2032
d75d5414
AM		 2033static inline void nfs4_init_once(struct nfs_inode *nfsi)
2034{
89d77c8f 2035#if IS_ENABLED(CONFIG_NFS_V4)
d75d5414
AM		 2036 INIT_LIST_HEAD(&nfsi->open_states);
2037 nfsi->delegation = NULL;
d75d5414 2038 init_rwsem(&nfsi->rwsem);
e5e94017 2039 nfsi->layout = NULL;
d75d5414
AM		 2040#endif
2041}
f7b422b1 2042
51cc5068 2043static void init_once(void *foo)
1da177e4
LT		 2044{
2045 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2046
a35afb83 2047 inode_init_once(&nfsi->vfs_inode);
a35afb83
CL		 2048 INIT_LIST_HEAD(&nfsi->open_files);
2049 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2050 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
ea2cf228 2051 INIT_LIST_HEAD(&nfsi->commit_info.list);
a6b6d5b8 2052 atomic_long_set(&nfsi->nrequests, 0);
5cb953d4 2053 atomic_long_set(&nfsi->commit_info.ncommit, 0);
1a0de48a 2054 atomic_set(&nfsi->commit_info.rpcs_out, 0);
884be175 2055 init_rwsem(&nfsi->rmdir_sem);
e824f99a 2056 mutex_init(&nfsi->commit_mutex);
a35afb83 2057 nfs4_init_once(nfsi);
1da177e4 2058}
20c2df83 2059
f7b422b1 2060static int __init nfs_init_inodecache(void)
1da177e4
LT		 2061{
2062 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2063 sizeof(struct nfs_inode),
fffb60f9 2064 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 2065 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 2066 init_once);
1da177e4
LT		 2067 if (nfs_inode_cachep == NULL)
2068 return -ENOMEM;
2069
2070 return 0;
2071}
2072
266bee88 2073static void nfs_destroy_inodecache(void)
1da177e4 2074{
8c0a8537
KS		 2075 /*
2076 * Make sure all delayed rcu free inodes are flushed before we
2077 * destroy cache.
2078 */
2079 rcu_barrier();
1a1d92c1 2080 kmem_cache_destroy(nfs_inode_cachep);
1da177e4
LT		 2081}
2082
5746006f 2083struct workqueue_struct *nfsiod_workqueue;
89d77c8f 2084EXPORT_SYMBOL_GPL(nfsiod_workqueue);
5746006f
TM		 2085
2086/*
2087 * start up the nfsiod workqueue
2088 */
2089static int nfsiod_start(void)
2090{
2091 struct workqueue_struct *wq;
2092 dprintk("RPC: creating workqueue nfsiod\n");
ada609ee 2093 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
5746006f
TM		 2094 if (wq == NULL)
2095 return -ENOMEM;
2096 nfsiod_workqueue = wq;
2097 return 0;
2098}
2099
2100/*
2101 * Destroy the nfsiod workqueue
2102 */
2103static void nfsiod_stop(void)
2104{
2105 struct workqueue_struct *wq;
2106
2107 wq = nfsiod_workqueue;
2108 if (wq == NULL)
2109 return;
2110 nfsiod_workqueue = NULL;
2111 destroy_workqueue(wq);
2112}
2113
c7d03a00 2114unsigned int nfs_net_id;
9e2e74db 2115EXPORT_SYMBOL_GPL(nfs_net_id);
1b340d01
SK		 2116
2117static int nfs_net_init(struct net *net)
2118{
6b13168b 2119 nfs_clients_init(net);
65b38851 2120 return nfs_fs_proc_net_init(net);
1b340d01
SK		 2121}
2122
2123static void nfs_net_exit(struct net *net)
2124{
b0b5352d
VA		 2125 struct nfs_net *nn = net_generic(net, nfs_net_id);
2126
65b38851 2127 nfs_fs_proc_net_exit(net);
28cd1b3f 2128 nfs_cleanup_cb_ident_idr(net);
b0b5352d
VA		 2129 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
2130 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
1b340d01
SK		 2131}
2132
2133static struct pernet_operations nfs_net_ops = {
2134 .init = nfs_net_init,
2135 .exit = nfs_net_exit,
2136 .id = &nfs_net_id,
2137 .size = sizeof(struct nfs_net),
2138};
2139
1da177e4
LT		 2140/*
2141 * Initialize NFS
2142 */
2143static int __init init_nfs_fs(void)
2144{
2145 int err;
2146
1b340d01 2147 err = register_pernet_subsys(&nfs_net_ops);
e571cbf1 2148 if (err < 0)
89d77c8f 2149 goto out9;
e571cbf1 2150
8ec442ae
DH		 2151 err = nfs_fscache_register();
2152 if (err < 0)
89d77c8f 2153 goto out8;
8ec442ae 2154
5746006f
TM		 2155 err = nfsiod_start();
2156 if (err)
89d77c8f 2157 goto out7;
5746006f 2158
6aaca566
DH		 2159 err = nfs_fs_proc_init();
2160 if (err)
89d77c8f 2161 goto out6;
6aaca566 2162
1da177e4
LT		 2163 err = nfs_init_nfspagecache();
2164 if (err)
89d77c8f 2165 goto out5;
1da177e4
LT		 2166
2167 err = nfs_init_inodecache();
2168 if (err)
89d77c8f 2169 goto out4;
1da177e4
LT		 2170
2171 err = nfs_init_readpagecache();
2172 if (err)
89d77c8f 2173 goto out3;
1da177e4
LT		 2174
2175 err = nfs_init_writepagecache();
2176 if (err)
89d77c8f 2177 goto out2;
1da177e4 2178
1da177e4
LT		 2179 err = nfs_init_directcache();
2180 if (err)
89d77c8f 2181 goto out1;
1da177e4 2182
ec7652aa 2183 rpc_proc_register(&init_net, &nfs_rpcstat);
cd738ee9
KM		 2184
2185 err = register_nfs_fs();
2186 if (err)
129d1977
BS		 2187 goto out0;
2188
1da177e4 2189 return 0;
129d1977 2190out0:
ec7652aa 2191 rpc_proc_unregister(&init_net, "nfs");
1da177e4 2192 nfs_destroy_directcache();
89d77c8f 2193out1:
129d1977 2194 nfs_destroy_writepagecache();
89d77c8f 2195out2:
129d1977 2196 nfs_destroy_readpagecache();
89d77c8f 2197out3:
129d1977 2198 nfs_destroy_inodecache();
89d77c8f 2199out4:
129d1977 2200 nfs_destroy_nfspagecache();
89d77c8f 2201out5:
129d1977 2202 nfs_fs_proc_exit();
89d77c8f 2203out6:
129d1977 2204 nfsiod_stop();
89d77c8f 2205out7:
129d1977 2206 nfs_fscache_unregister();
89d77c8f 2207out8:
129d1977 2208 unregister_pernet_subsys(&nfs_net_ops);
89d77c8f 2209out9:
1da177e4
LT		 2210 return err;
2211}
2212
2213static void __exit exit_nfs_fs(void)
2214{
1da177e4 2215 nfs_destroy_directcache();
1da177e4
LT		 2216 nfs_destroy_writepagecache();
2217 nfs_destroy_readpagecache();
2218 nfs_destroy_inodecache();
2219 nfs_destroy_nfspagecache();
8ec442ae 2220 nfs_fscache_unregister();
1b340d01 2221 unregister_pernet_subsys(&nfs_net_ops);
ec7652aa 2222 rpc_proc_unregister(&init_net, "nfs");
f7b422b1 2223 unregister_nfs_fs();
6aaca566 2224 nfs_fs_proc_exit();
5746006f 2225 nfsiod_stop();
1da177e4
LT		 2226}
2227
2228/* Not quite true; I just maintain it */
2229MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2230MODULE_LICENSE("GPL");
f43bf0be 2231module_param(enable_ino64, bool, 0644);
1da177e4
LT		 2232
2233module_init(init_nfs_fs)
2234module_exit(exit_nfs_fs)
Linux 6.x block layer and io_uring tree(s)