projects / linux-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
pstore: Convert internal records to timespec64
[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
f43bf0be
TM		 88/**
89 * nfs_compat_user_ino64 - returns the user-visible inode number
90 * @fileid: 64-bit fileid
91 *
92 * This function returns a 32-bit inode number if the boot parameter
93 * nfs.enable_ino64 is zero.
94 */
95u64 nfs_compat_user_ino64(u64 fileid)
96{
3fa0b4e2
FF		 97#ifdef CONFIG_COMPAT
98 compat_ulong_t ino;
99#else
100 unsigned long ino;
101#endif
f43bf0be
TM		 102
103 if (enable_ino64)
104 return fileid;
105 ino = fileid;
106 if (sizeof(ino) < sizeof(fileid))
107 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
108 return ino;
109}
110
eed99357
TM		 111int nfs_drop_inode(struct inode *inode)
112{
113 return NFS_STALE(inode) || generic_drop_inode(inode);
114}
115EXPORT_SYMBOL_GPL(nfs_drop_inode);
116
19d87ca3 117void nfs_clear_inode(struct inode *inode)
1da177e4 118{
da6d503a
TM		 119 /*
120 * The following should never happen...
121 */
f48407dd
TM		 122 WARN_ON_ONCE(nfs_have_writebacks(inode));
123 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
ada70d94 124 nfs_zap_acl_cache(inode);
1c3c07e9 125 nfs_access_zap_cache(inode);
f1fe29b4 126 nfs_fscache_clear_inode(inode);
1da177e4 127}
89d77c8f 128EXPORT_SYMBOL_GPL(nfs_clear_inode);
1da177e4 129
b57922d9
AV		 130void nfs_evict_inode(struct inode *inode)
131{
91b0abe3 132 truncate_inode_pages_final(&inode->i_data);
dbd5768f 133 clear_inode(inode);
b57922d9
AV		 134 nfs_clear_inode(inode);
135}
136
9e1681c2 137int nfs_sync_inode(struct inode *inode)
4d346bea 138{
95d9f6c3 139 inode_dio_wait(inode);
4d346bea
TM		 140 return nfs_wb_all(inode);
141}
9e1681c2 142EXPORT_SYMBOL_GPL(nfs_sync_inode);
4d346bea 143
29884df0
TM		 144/**
145 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
146 */
147int nfs_sync_mapping(struct address_space *mapping)
148{
5cf95214 149 int ret = 0;
29884df0 150
5cf95214
TM		 151 if (mapping->nrpages != 0) {
152 unmap_mapping_range(mapping, 0, 0, 0);
153 ret = nfs_wb_all(mapping->host);
154 }
29884df0
TM		 155 return ret;
156}
157
187e593d
TM		 158static int nfs_attribute_timeout(struct inode *inode)
159{
160 struct nfs_inode *nfsi = NFS_I(inode);
161
162 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
163}
164
61540bf6
TM		 165static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
166{
167 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
168
169 /* Special case for the pagecache or access cache */
170 if (flags == NFS_INO_REVAL_PAGECACHE &&
171 !(cache_validity & NFS_INO_REVAL_FORCED))
172 return false;
173 return (cache_validity & flags) != 0;
174}
175
176static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
177{
178 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
179
180 if ((cache_validity & flags) != 0)
181 return true;
182 if (nfs_attribute_timeout(inode))
183 return true;
184 return false;
185}
186
187bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
188{
189 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
190 return nfs_check_cache_invalid_delegated(inode, flags);
191
192 return nfs_check_cache_invalid_not_delegated(inode, flags);
193}
194
6edf9609
TM		 195static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
196{
197 struct nfs_inode *nfsi = NFS_I(inode);
d943f2dd 198 bool have_delegation = nfs_have_delegated_attributes(inode);
6edf9609 199
d943f2dd
TM		 200 if (have_delegation)
201 flags &= ~(NFS_INO_INVALID_CHANGE|NFS_INO_REVAL_PAGECACHE);
6edf9609
TM		 202 if (inode->i_mapping->nrpages == 0)
203 flags &= ~NFS_INO_INVALID_DATA;
204 nfsi->cache_validity |= flags;
205 if (flags & NFS_INO_INVALID_DATA)
206 nfs_fscache_invalidate(inode);
207}
208
1da177e4
LT		 209/*
210 * Invalidate the local caches
211 */
b37b03b7 212static void nfs_zap_caches_locked(struct inode *inode)
1da177e4
LT		 213{
214 struct nfs_inode *nfsi = NFS_I(inode);
215 int mode = inode->i_mode;
216
91d5b470
CL		 217 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
218
c7c20973
TM		 219 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
220 nfsi->attrtimeo_timestamp = jiffies;
1da177e4 221
c3f52af3 222 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
de242c0b 223 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
6edf9609 224 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 225 | NFS_INO_INVALID_DATA
226 | NFS_INO_INVALID_ACCESS
227 | NFS_INO_INVALID_ACL
6edf9609 228 | NFS_INO_REVAL_PAGECACHE);
aa9c2669 229 } else
6edf9609 230 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 231 | NFS_INO_INVALID_ACCESS
232 | NFS_INO_INVALID_ACL
6edf9609 233 | NFS_INO_REVAL_PAGECACHE);
fd1defc2 234 nfs_zap_label_cache_locked(nfsi);
b37b03b7 235}
dc59250c 236
b37b03b7
TM		 237void nfs_zap_caches(struct inode *inode)
238{
239 spin_lock(&inode->i_lock);
240 nfs_zap_caches_locked(inode);
dc59250c 241 spin_unlock(&inode->i_lock);
ada70d94
TM		 242}
243
cd9ae2b6
TM		 244void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
245{
246 if (mapping->nrpages != 0) {
247 spin_lock(&inode->i_lock);
6edf9609 248 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
cd9ae2b6
TM		 249 spin_unlock(&inode->i_lock);
250 }
251}
252
f41f7418 253void nfs_zap_acl_cache(struct inode *inode)
ada70d94
TM		 254{
255 void (*clear_acl_cache)(struct inode *);
256
257 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
258 if (clear_acl_cache != NULL)
259 clear_acl_cache(inode);
dc59250c 260 spin_lock(&inode->i_lock);
55296809 261 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
dc59250c 262 spin_unlock(&inode->i_lock);
1da177e4 263}
1c606fb7 264EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
1da177e4 265
c4812998
TM		 266void nfs_invalidate_atime(struct inode *inode)
267{
268 spin_lock(&inode->i_lock);
6edf9609 269 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
c4812998
TM		 270 spin_unlock(&inode->i_lock);
271}
ddda8e0a 272EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
c4812998 273
1da177e4 274/*
b37b03b7
TM		 275 * Invalidate, but do not unhash, the inode.
276 * NB: must be called with inode->i_lock held!
1da177e4 277 */
b37b03b7 278static void nfs_invalidate_inode(struct inode *inode)
1da177e4 279{
3a10c30a 280 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
b37b03b7 281 nfs_zap_caches_locked(inode);
1da177e4
LT		 282}
283
284struct nfs_find_desc {
285 struct nfs_fh *fh;
286 struct nfs_fattr *fattr;
287};
288
289/*
290 * In NFSv3 we can have 64bit inode numbers. In order to support
291 * this, and re-exported directories (also seen in NFSv2)
292 * we are forced to allow 2 different inodes to have the same
293 * i_ino.
294 */
295static int
296nfs_find_actor(struct inode *inode, void *opaque)
297{
298 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
299 struct nfs_fh *fh = desc->fh;
300 struct nfs_fattr *fattr = desc->fattr;
301
302 if (NFS_FILEID(inode) != fattr->fileid)
303 return 0;
f6488c9b
JL		 304 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
305 return 0;
1da177e4
LT		 306 if (nfs_compare_fh(NFS_FH(inode), fh))
307 return 0;
308 if (is_bad_inode(inode) || NFS_STALE(inode))
309 return 0;
310 return 1;
311}
312
313static int
314nfs_init_locked(struct inode *inode, void *opaque)
315{
316 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
317 struct nfs_fattr *fattr = desc->fattr;
318
99fadcd7 319 set_nfs_fileid(inode, fattr->fileid);
916ec34d 320 inode->i_mode = fattr->mode;
1da177e4
LT		 321 nfs_copy_fh(NFS_FH(inode), desc->fh);
322 return 0;
323}
324
e058f70b 325#ifdef CONFIG_NFS_V4_SECURITY_LABEL
fd1defc2
TM		 326static void nfs_clear_label_invalid(struct inode *inode)
327{
328 spin_lock(&inode->i_lock);
329 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
330 spin_unlock(&inode->i_lock);
331}
332
aa9c2669
DQ		 333void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
334 struct nfs4_label *label)
335{
336 int error;
337
338 if (label == NULL)
339 return;
340
aa9c2669
DQ		 341 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
342 error = security_inode_notifysecctx(inode, label->label,
343 label->len);
344 if (error)
345 printk(KERN_ERR "%s() %s %d "
346 "security_inode_notifysecctx() %d\n",
347 __func__,
348 (char *)label->label,
349 label->len, error);
fd1defc2 350 nfs_clear_label_invalid(inode);
aa9c2669
DQ		 351 }
352}
353
e058f70b
SD		 354struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
355{
356 struct nfs4_label *label = NULL;
357 int minor_version = server->nfs_client->cl_minorversion;
358
359 if (minor_version < 2)
360 return label;
361
362 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
363 return label;
364
365 label = kzalloc(sizeof(struct nfs4_label), flags);
366 if (label == NULL)
367 return ERR_PTR(-ENOMEM);
368
369 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
370 if (label->label == NULL) {
371 kfree(label);
372 return ERR_PTR(-ENOMEM);
373 }
374 label->len = NFS4_MAXLABELLEN;
375
376 return label;
377}
378EXPORT_SYMBOL_GPL(nfs4_label_alloc);
aa9c2669 379#else
829e57d7 380void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
aa9c2669
DQ		 381 struct nfs4_label *label)
382{
383}
e058f70b 384#endif
aa9c2669 385EXPORT_SYMBOL_GPL(nfs_setsecurity);
e058f70b 386
f174ff7a
PT		 387/* Search for inode identified by fh, fileid and i_mode in inode cache. */
388struct inode *
389nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
390{
391 struct nfs_find_desc desc = {
392 .fh = fh,
393 .fattr = fattr,
394 };
395 struct inode *inode;
396 unsigned long hash;
397
398 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
399 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
400 return NULL;
401
402 hash = nfs_fattr_to_ino_t(fattr);
403 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
404
405 dprintk("%s: returning %p\n", __func__, inode);
406 return inode;
407}
408
1da177e4
LT		 409/*
410 * This is our front-end to iget that looks up inodes by file handle
411 * instead of inode number.
412 */
413struct inode *
1775fd3e 414nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
1da177e4
LT		 415{
416 struct nfs_find_desc desc = {
417 .fh = fh,
418 .fattr = fattr
419 };
03f28e3a 420 struct inode *inode = ERR_PTR(-ENOENT);
1da177e4
LT		 421 unsigned long hash;
422
7ebb9315
BS		 423 nfs_attr_check_mountpoint(sb, fattr);
424
2ef47eb1
AS		 425 if (nfs_attr_use_mounted_on_fileid(fattr))
426 fattr->fileid = fattr->mounted_on_fileid;
427 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
1da177e4 428 goto out_no_inode;
9e6e70f8 429 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
1da177e4 430 goto out_no_inode;
1da177e4
LT		 431
432 hash = nfs_fattr_to_ino_t(fattr);
433
03f28e3a
TM		 434 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
435 if (inode == NULL) {
436 inode = ERR_PTR(-ENOMEM);
1da177e4 437 goto out_no_inode;
03f28e3a 438 }
1da177e4
LT		 439
440 if (inode->i_state & I_NEW) {
441 struct nfs_inode *nfsi = NFS_I(inode);
b0c4fddc 442 unsigned long now = jiffies;
1da177e4
LT		 443
444 /* We set i_ino for the few things that still rely on it,
445 * such as stat(2) */
446 inode->i_ino = hash;
447
448 /* We can't support update_atime(), since the server will reset it */
449 inode->i_flags |= S_NOATIME|S_NOCMTIME;
450 inode->i_mode = fattr->mode;
62ab460c
TM		 451 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
452 && nfs_server_capable(inode, NFS_CAP_MODE))
16e14375 453 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
1da177e4
LT		 454 /* Why so? Because we want revalidate for devices/FIFOs, and
455 * that's precisely what we have in nfs_file_inode_operations.
456 */
8fa5c000 457 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
1da177e4 458 if (S_ISREG(inode->i_mode)) {
1788ea6e 459 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
1da177e4 460 inode->i_data.a_ops = &nfs_file_aops;
1da177e4 461 } else if (S_ISDIR(inode->i_mode)) {
8fa5c000 462 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
1da177e4 463 inode->i_fop = &nfs_dir_operations;
11de3b11 464 inode->i_data.a_ops = &nfs_dir_aops;
55a97593 465 /* Deal with crossing mountpoints */
7ebb9315
BS		 466 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
467 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
6b97fd3d
MN		 468 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
469 inode->i_op = &nfs_referral_inode_operations;
470 else
471 inode->i_op = &nfs_mountpoint_inode_operations;
55a97593 472 inode->i_fop = NULL;
36d43a43 473 inode->i_flags |= S_AUTOMOUNT;
55a97593 474 }
21fc61c7 475 } else if (S_ISLNK(inode->i_mode)) {
1da177e4 476 inode->i_op = &nfs_symlink_inode_operations;
21fc61c7
AV		 477 inode_nohighmem(inode);
478 } else
1da177e4
LT		 479 init_special_inode(inode, inode->i_mode, fattr->rdev);
480
9e6e70f8
TM		 481 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
482 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
483 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
1eb5d98f 484 inode_set_iversion_raw(inode, 0);
9e6e70f8 485 inode->i_size = 0;
6d6b77f1 486 clear_nlink(inode);
9ff593c4
EB		 487 inode->i_uid = make_kuid(&init_user_ns, -2);
488 inode->i_gid = make_kgid(&init_user_ns, -2);
9e6e70f8
TM		 489 inode->i_blocks = 0;
490 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
2701d086
AA		 491 nfsi->write_io = 0;
492 nfsi->read_io = 0;
9e6e70f8 493
33801147 494 nfsi->read_cache_jiffies = fattr->time_start;
4704f0e2 495 nfsi->attr_gencount = fattr->gencount;
9e6e70f8
TM		 496 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
497 inode->i_atime = fattr->atime;
62ab460c 498 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
16e14375 499 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
9e6e70f8
TM		 500 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
501 inode->i_mtime = fattr->mtime;
62ab460c 502 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
16e14375 503 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
9e6e70f8
TM		 504 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
505 inode->i_ctime = fattr->ctime;
62ab460c 506 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
16e14375 507 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
9e6e70f8 508 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1eb5d98f 509 inode_set_iversion_raw(inode, fattr->change_attr);
cd812599 510 else
16e14375 511 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
9e6e70f8
TM		 512 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
513 inode->i_size = nfs_size_to_loff_t(fattr->size);
62ab460c 514 else
16e14375 515 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
9e6e70f8 516 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
bfe86848 517 set_nlink(inode, fattr->nlink);
62ab460c 518 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
16e14375 519 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 520 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
521 inode->i_uid = fattr->uid;
62ab460c 522 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
16e14375 523 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 524 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
525 inode->i_gid = fattr->gid;
62ab460c 526 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
16e14375 527 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 528 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
529 inode->i_blocks = fattr->du.nfs2.blocks;
530 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 531 /*
532 * report the blocks in 512byte units
533 */
534 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1da177e4 535 }
aa9c2669
DQ		 536
537 nfs_setsecurity(inode, fattr, label);
538
1da177e4 539 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
b0c4fddc 540 nfsi->attrtimeo_timestamp = now;
1c3c07e9 541 nfsi->access_cache = RB_ROOT;
1da177e4 542
f1fe29b4 543 nfs_fscache_init_inode(inode);
ef79c097 544
1da177e4 545 unlock_new_inode(inode);
26fde4df
N		 546 } else {
547 int err = nfs_refresh_inode(inode, fattr);
548 if (err < 0) {
549 iput(inode);
550 inode = ERR_PTR(err);
551 goto out_no_inode;
552 }
553 }
1e8968c5 554 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
1da177e4 555 inode->i_sb->s_id,
1e8968c5 556 (unsigned long long)NFS_FILEID(inode),
4f1abd22 557 nfs_display_fhandle_hash(fh),
1da177e4
LT		 558 atomic_read(&inode->i_count));
559
560out:
561 return inode;
562
563out_no_inode:
03f28e3a 564 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
1da177e4
LT		 565 goto out;
566}
89d77c8f 567EXPORT_SYMBOL_GPL(nfs_fhget);
1da177e4 568
536e43d1 569#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		 570
571int
572nfs_setattr(struct dentry *dentry, struct iattr *attr)
573{
2b0143b5 574 struct inode *inode = d_inode(dentry);
987f8dfc 575 struct nfs_fattr *fattr;
ae57ca0f 576 int error = 0;
1da177e4 577
91d5b470
CL		 578 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
579
188b95dd
JL		 580 /* skip mode change if it's just for clearing setuid/setgid */
581 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
582 attr->ia_valid &= ~ATTR_MODE;
583
1da177e4 584 if (attr->ia_valid & ATTR_SIZE) {
08a899d5
CH		 585 BUG_ON(!S_ISREG(inode->i_mode));
586
ae57ca0f
KM		 587 error = inode_newsize_ok(inode, attr->ia_size);
588 if (error)
589 return error;
590
591 if (attr->ia_size == i_size_read(inode))
1da177e4
LT		 592 attr->ia_valid &= ~ATTR_SIZE;
593 }
594
595 /* Optimization: if the end result is no change, don't RPC */
596 attr->ia_valid &= NFS_VALID_ATTRS;
536e43d1 597 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
1da177e4
LT		 598 return 0;
599
f4ce1299
TM		 600 trace_nfs_setattr_enter(inode);
601
755c1e20 602 /* Write all dirty data */
4d346bea
TM		 603 if (S_ISREG(inode->i_mode))
604 nfs_sync_inode(inode);
987f8dfc
TM		 605
606 fattr = nfs_alloc_fattr();
ae57ca0f
KM		 607 if (fattr == NULL) {
608 error = -ENOMEM;
987f8dfc 609 goto out;
ae57ca0f
KM		 610 }
611
987f8dfc 612 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
65e4308d 613 if (error == 0)
aa9c2669 614 error = nfs_refresh_inode(inode, fattr);
987f8dfc
TM		 615 nfs_free_fattr(fattr);
616out:
f4ce1299 617 trace_nfs_setattr_exit(inode, error);
65e4308d
TM		 618 return error;
619}
ddda8e0a 620EXPORT_SYMBOL_GPL(nfs_setattr);
65e4308d 621
a3d01454
TM		 622/**
623 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
624 * @inode: inode of the file used
625 * @offset: file offset to start truncating
626 *
627 * This is a copy of the common vmtruncate, but with the locking
628 * corrected to take into account the fact that NFS requires
629 * inode->i_size to be updated under the inode->i_lock.
f044636d 630 * Note: must be called with inode->i_lock held!
a3d01454
TM		 631 */
632static int nfs_vmtruncate(struct inode * inode, loff_t offset)
633{
c08d3b0e 634 int err;
a3d01454 635
c08d3b0e 636 err = inode_newsize_ok(inode, offset);
637 if (err)
638 goto out;
a3d01454 639
c08d3b0e 640 i_size_write(inode, offset);
6edf9609
TM		 641 /* Optimisation */
642 if (offset == 0)
643 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
f6cdfa6d 644 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
c08d3b0e 645
f044636d 646 spin_unlock(&inode->i_lock);
7caef267 647 truncate_pagecache(inode, offset);
f044636d 648 spin_lock(&inode->i_lock);
c08d3b0e 649out:
650 return err;
a3d01454
TM		 651}
652
65e4308d
TM		 653/**
654 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
655 * @inode: pointer to struct inode
656 * @attr: pointer to struct iattr
16e14375 657 * @fattr: pointer to struct nfs_fattr
65e4308d
TM		 658 *
659 * Note: we do this in the *proc.c in order to ensure that
660 * it works for things like exclusive creates too.
661 */
f044636d
TM		 662void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
663 struct nfs_fattr *fattr)
65e4308d 664{
f044636d
TM		 665 /* Barrier: bump the attribute generation count. */
666 nfs_fattr_set_barrier(fattr);
667
668 spin_lock(&inode->i_lock);
669 NFS_I(inode)->attr_gencount = fattr->gencount;
16e14375
TM		 670 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
671 | NFS_INO_INVALID_CTIME);
65e4308d 672 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
1da177e4 673 if ((attr->ia_valid & ATTR_MODE) != 0) {
65e4308d
TM		 674 int mode = attr->ia_mode & S_IALLUGO;
675 mode |= inode->i_mode & ~S_IALLUGO;
1da177e4
LT		 676 inode->i_mode = mode;
677 }
678 if ((attr->ia_valid & ATTR_UID) != 0)
679 inode->i_uid = attr->ia_uid;
680 if ((attr->ia_valid & ATTR_GID) != 0)
681 inode->i_gid = attr->ia_gid;
6edf9609
TM		 682 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
683 | NFS_INO_INVALID_ACL);
65e4308d
TM		 684 }
685 if ((attr->ia_valid & ATTR_SIZE) != 0) {
16e14375 686 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
91d5b470 687 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
a3d01454 688 nfs_vmtruncate(inode, attr->ia_size);
65e4308d 689 }
616c3196
JL		 690 if (fattr->valid)
691 nfs_update_inode(inode, fattr);
f044636d 692 spin_unlock(&inode->i_lock);
1da177e4 693}
ddda8e0a 694EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
1da177e4 695
1bcf4c5c 696static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
311324ad
TM		 697{
698 struct dentry *parent;
699
1bcf4c5c
TM		 700 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
701 return;
311324ad 702 parent = dget_parent(dentry);
2b0143b5 703 nfs_force_use_readdirplus(d_inode(parent));
311324ad
TM		 704 dput(parent);
705}
706
1bcf4c5c
TM		 707static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
708{
709 struct dentry *parent;
710
711 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
712 return;
713 parent = dget_parent(dentry);
714 nfs_advise_use_readdirplus(d_inode(parent));
715 dput(parent);
716}
717
311324ad
TM		 718static bool nfs_need_revalidate_inode(struct inode *inode)
719{
720 if (NFS_I(inode)->cache_validity &
721 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
722 return true;
723 if (nfs_attribute_cache_expired(inode))
724 return true;
725 return false;
726}
727
a528d35e
DH		 728int nfs_getattr(const struct path *path, struct kstat *stat,
729 u32 request_mask, unsigned int query_flags)
1da177e4 730{
a528d35e 731 struct inode *inode = d_inode(path->dentry);
9ccee940
TM		 732 struct nfs_server *server = NFS_SERVER(inode);
733 unsigned long cache_validity;
16caf5b6 734 int err = 0;
9ccee940
TM		 735 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
736 bool do_update = false;
1da177e4 737
f4ce1299 738 trace_nfs_getattr_enter(inode);
9ccee940
TM		 739
740 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync)
741 goto out_no_update;
742
acdc53b2 743 /* Flush out writes to the server in order to update c/mtime. */
9ccee940
TM		 744 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
745 S_ISREG(inode->i_mode)) {
79566ef0 746 err = filemap_write_and_wait(inode->i_mapping);
acdc53b2
TM		 747 if (err)
748 goto out;
28c494c5 749 }
fc33a7bb
CH		 750
751 /*
752 * We may force a getattr if the user cares about atime.
753 *
754 * Note that we only have to check the vfsmount flags here:
755 * - NFS always sets S_NOATIME by so checking it would give a
756 * bogus result
1751e8a6 757 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
fc33a7bb
CH		 758 * no point in checking those.
759 */
a528d35e
DH		 760 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
761 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
9ccee940
TM		 762 request_mask &= ~STATX_ATIME;
763
764 /* Is the user requesting attributes that might need revalidation? */
765 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
766 STATX_MTIME|STATX_UID|STATX_GID|
767 STATX_SIZE|STATX_BLOCKS)))
768 goto out_no_revalidate;
769
770 /* Check whether the cached attributes are stale */
771 do_update |= force_sync || nfs_attribute_cache_expired(inode);
772 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
773 do_update |= cache_validity &
774 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
775 if (request_mask & STATX_ATIME)
776 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
777 if (request_mask & (STATX_CTIME|STATX_MTIME))
778 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
779 if (do_update) {
780 /* Update the attribute cache */
59b86d85
HT		 781 if (!(server->flags & NFS_MOUNT_NOAC))
782 nfs_readdirplus_parent_cache_miss(path->dentry);
783 else
784 nfs_readdirplus_parent_cache_hit(path->dentry);
311324ad 785 err = __nfs_revalidate_inode(server, inode);
9ccee940
TM		 786 if (err)
787 goto out;
1bcf4c5c 788 } else
a528d35e 789 nfs_readdirplus_parent_cache_hit(path->dentry);
9ccee940
TM		 790out_no_revalidate:
791 /* Only return attributes that were revalidated. */
792 stat->result_mask &= request_mask;
793out_no_update:
794 generic_fillattr(inode, stat);
795 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
796 if (S_ISDIR(inode->i_mode))
797 stat->blksize = NFS_SERVER(inode)->dtsize;
acdc53b2 798out:
f4ce1299 799 trace_nfs_getattr_exit(inode, err);
1da177e4
LT		 800 return err;
801}
ddda8e0a 802EXPORT_SYMBOL_GPL(nfs_getattr);
1da177e4 803
f11ac8db
TM		 804static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
805{
2f62b5aa 806 refcount_set(&l_ctx->count, 1);
d51fdb87 807 l_ctx->lockowner = current->files;
f11ac8db 808 INIT_LIST_HEAD(&l_ctx->list);
210c7c17 809 atomic_set(&l_ctx->io_count, 0);
f11ac8db
TM		 810}
811
812static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
813{
8c86899f
TM		 814 struct nfs_lock_context *head = &ctx->lock_context;
815 struct nfs_lock_context *pos = head;
f11ac8db 816
8c86899f 817 do {
d51fdb87 818 if (pos->lockowner != current->files)
f11ac8db 819 continue;
2f62b5aa 820 refcount_inc(&pos->count);
f11ac8db 821 return pos;
8c86899f 822 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
f11ac8db
TM		 823 return NULL;
824}
825
826struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
827{
828 struct nfs_lock_context *res, *new = NULL;
2b0143b5 829 struct inode *inode = d_inode(ctx->dentry);
f11ac8db
TM		 830
831 spin_lock(&inode->i_lock);
832 res = __nfs_find_lock_context(ctx);
833 if (res == NULL) {
834 spin_unlock(&inode->i_lock);
835 new = kmalloc(sizeof(*new), GFP_KERNEL);
836 if (new == NULL)
b3c54de6 837 return ERR_PTR(-ENOMEM);
f11ac8db
TM		 838 nfs_init_lock_context(new);
839 spin_lock(&inode->i_lock);
840 res = __nfs_find_lock_context(ctx);
841 if (res == NULL) {
842 list_add_tail(&new->list, &ctx->lock_context.list);
843 new->open_context = ctx;
844 res = new;
845 new = NULL;
846 }
847 }
848 spin_unlock(&inode->i_lock);
849 kfree(new);
850 return res;
851}
1c6dcbe5 852EXPORT_SYMBOL_GPL(nfs_get_lock_context);
f11ac8db
TM		 853
854void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
855{
856 struct nfs_open_context *ctx = l_ctx->open_context;
2b0143b5 857 struct inode *inode = d_inode(ctx->dentry);
f11ac8db 858
2f62b5aa 859 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
f11ac8db
TM		 860 return;
861 list_del(&l_ctx->list);
862 spin_unlock(&inode->i_lock);
863 kfree(l_ctx);
864}
1c6dcbe5 865EXPORT_SYMBOL_GPL(nfs_put_lock_context);
f11ac8db 866
7fe5c398
TM		 867/**
868 * nfs_close_context - Common close_context() routine NFSv2/v3
869 * @ctx: pointer to context
870 * @is_sync: is this a synchronous close
871 *
5cf9d706
TM		 872 * Ensure that the attributes are up to date if we're mounted
873 * with close-to-open semantics and we have cached data that will
874 * need to be revalidated on open.
7fe5c398
TM		 875 */
876void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
877{
5cf9d706 878 struct nfs_inode *nfsi;
7fe5c398
TM		 879 struct inode *inode;
880 struct nfs_server *server;
881
882 if (!(ctx->mode & FMODE_WRITE))
883 return;
884 if (!is_sync)
885 return;
2b0143b5 886 inode = d_inode(ctx->dentry);
58ff4184
TM		 887 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
888 return;
5cf9d706
TM		 889 nfsi = NFS_I(inode);
890 if (inode->i_mapping->nrpages == 0)
891 return;
892 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
893 return;
894 if (!list_empty(&nfsi->open_files))
7fe5c398
TM		 895 return;
896 server = NFS_SERVER(inode);
897 if (server->flags & NFS_MOUNT_NOCTO)
898 return;
899 nfs_revalidate_inode(server, inode);
900}
ddda8e0a 901EXPORT_SYMBOL_GPL(nfs_close_context);
7fe5c398 902
532d4def
N		 903struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
904 fmode_t f_mode,
905 struct file *filp)
1da177e4
LT		 906{
907 struct nfs_open_context *ctx;
5ede7b1c
AV		 908 struct rpc_cred *cred = rpc_lookup_cred();
909 if (IS_ERR(cred))
910 return ERR_CAST(cred);
1da177e4 911
f52720ca 912 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
5ede7b1c
AV		 913 if (!ctx) {
914 put_rpccred(cred);
915 return ERR_PTR(-ENOMEM);
1da177e4 916 }
5ede7b1c
AV		 917 nfs_sb_active(dentry->d_sb);
918 ctx->dentry = dget(dentry);
919 ctx->cred = cred;
920 ctx->state = NULL;
921 ctx->mode = f_mode;
922 ctx->flags = 0;
923 ctx->error = 0;
532d4def 924 ctx->flock_owner = (fl_owner_t)filp;
5ede7b1c
AV		 925 nfs_init_lock_context(&ctx->lock_context);
926 ctx->lock_context.open_context = ctx;
927 INIT_LIST_HEAD(&ctx->list);
82be417a 928 ctx->mdsthreshold = NULL;
1da177e4
LT		 929 return ctx;
930}
89d77c8f 931EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1da177e4
LT		 932
933struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
934{
935 if (ctx != NULL)
2f62b5aa 936 refcount_inc(&ctx->lock_context.count);
1da177e4
LT		 937 return ctx;
938}
89d77c8f 939EXPORT_SYMBOL_GPL(get_nfs_open_context);
1da177e4 940
7fe5c398 941static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1da177e4 942{
2b0143b5 943 struct inode *inode = d_inode(ctx->dentry);
3d4ff43d 944 struct super_block *sb = ctx->dentry->d_sb;
3bec63db 945
5c78f58e 946 if (!list_empty(&ctx->list)) {
2f62b5aa 947 if (!refcount_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
ef84303e
BH		 948 return;
949 list_del(&ctx->list);
950 spin_unlock(&inode->i_lock);
2f62b5aa 951 } else if (!refcount_dec_and_test(&ctx->lock_context.count))
5e11934d 952 return;
5c78f58e
TM		 953 if (inode != NULL)
954 NFS_PROTO(inode)->close_context(ctx, is_sync);
3bec63db
TM		 955 if (ctx->cred != NULL)
956 put_rpccred(ctx->cred);
3d4ff43d 957 dput(ctx->dentry);
322b2b90 958 nfs_sb_deactive(sb);
82be417a 959 kfree(ctx->mdsthreshold);
3bec63db
TM		 960 kfree(ctx);
961}
962
a49c3c77
TM		 963void put_nfs_open_context(struct nfs_open_context *ctx)
964{
965 __put_nfs_open_context(ctx, 0);
966}
89d77c8f 967EXPORT_SYMBOL_GPL(put_nfs_open_context);
a49c3c77 968
4eae5014
TM		 969static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
970{
971 __put_nfs_open_context(ctx, 1);
972}
973
1da177e4
LT		 974/*
975 * Ensure that mmap has a recent RPC credential for use when writing out
976 * shared pages
977 */
c45ffdd2 978void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1da177e4 979{
2b0143b5 980 struct inode *inode = d_inode(ctx->dentry);
1da177e4
LT		 981 struct nfs_inode *nfsi = NFS_I(inode);
982
1da177e4 983 spin_lock(&inode->i_lock);
ca0daa27
TM		 984 if (ctx->mode & FMODE_WRITE)
985 list_add(&ctx->list, &nfsi->open_files);
986 else
987 list_add_tail(&ctx->list, &nfsi->open_files);
1da177e4
LT		 988 spin_unlock(&inode->i_lock);
989}
c45ffdd2
TM		 990EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
991
992void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
993{
994 filp->private_data = get_nfs_open_context(ctx);
995 if (list_empty(&ctx->list))
996 nfs_inode_attach_open_context(ctx);
997}
89d77c8f 998EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1da177e4 999
d530838b
TM		 1000/*
1001 * Given an inode, search for an open context with the desired characteristics
1002 */
dc0b027d 1003struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
1da177e4
LT		 1004{
1005 struct nfs_inode *nfsi = NFS_I(inode);
1006 struct nfs_open_context *pos, *ctx = NULL;
1007
1008 spin_lock(&inode->i_lock);
1009 list_for_each_entry(pos, &nfsi->open_files, list) {
d530838b
TM		 1010 if (cred != NULL && pos->cred != cred)
1011 continue;
1544fa0f
TM		 1012 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1013 continue;
1014 ctx = get_nfs_open_context(pos);
1015 break;
1da177e4
LT		 1016 }
1017 spin_unlock(&inode->i_lock);
1018 return ctx;
1019}
1020
aff8d8dc 1021void nfs_file_clear_open_context(struct file *filp)
1da177e4 1022{
cd3758e3 1023 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1da177e4
LT		 1024
1025 if (ctx) {
2b0143b5 1026 struct inode *inode = d_inode(ctx->dentry);
c45ffdd2 1027
0bcbf039
PT		 1028 /*
1029 * We fatal error on write before. Try to writeback
1030 * every page again.
1031 */
1032 if (ctx->error < 0)
1033 invalidate_inode_pages2(inode->i_mapping);
1da177e4
LT		 1034 filp->private_data = NULL;
1035 spin_lock(&inode->i_lock);
1036 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
1037 spin_unlock(&inode->i_lock);
4eae5014 1038 put_nfs_open_context_sync(ctx);
1da177e4
LT		 1039 }
1040}
1041
1042/*
1043 * These allocate and release file read/write context information.
1044 */
1045int nfs_open(struct inode *inode, struct file *filp)
1046{
1047 struct nfs_open_context *ctx;
1da177e4 1048
532d4def 1049 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
5ede7b1c
AV		 1050 if (IS_ERR(ctx))
1051 return PTR_ERR(ctx);
1da177e4
LT		 1052 nfs_file_set_open_context(filp, ctx);
1053 put_nfs_open_context(ctx);
f1fe29b4 1054 nfs_fscache_open_file(inode, filp);
1da177e4
LT		 1055 return 0;
1056}
1057
1da177e4
LT		 1058/*
1059 * This function is called whenever some part of NFS notices that
1060 * the cached attributes have to be refreshed.
1061 */
1062int
1063__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1064{
1065 int status = -ESTALE;
1775fd3e 1066 struct nfs4_label *label = NULL;
a3cba2aa 1067 struct nfs_fattr *fattr = NULL;
1da177e4 1068 struct nfs_inode *nfsi = NFS_I(inode);
1da177e4 1069
1e8968c5
NV		 1070 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1071 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1da177e4 1072
f4ce1299
TM		 1073 trace_nfs_revalidate_inode_enter(inode);
1074
85233a7a 1075 if (is_bad_inode(inode))
691beb13 1076 goto out;
1da177e4 1077 if (NFS_STALE(inode))
412d582e 1078 goto out;
7fdc49c4 1079
ac46bd37
TM		 1080 /* pNFS: Attributes aren't updated until we layoutcommit */
1081 if (S_ISREG(inode->i_mode)) {
1082 status = pnfs_sync_inode(inode, false);
1083 if (status)
1084 goto out;
1085 }
1086
a3cba2aa
TM		 1087 status = -ENOMEM;
1088 fattr = nfs_alloc_fattr();
1089 if (fattr == NULL)
1090 goto out;
1091
691beb13 1092 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
14c43f76
DQ		 1093
1094 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1095 if (IS_ERR(label)) {
1096 status = PTR_ERR(label);
1097 goto out;
1098 }
1099
1775fd3e 1100 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
1da177e4 1101 if (status != 0) {
1e8968c5 1102 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1da177e4 1103 inode->i_sb->s_id,
1e8968c5 1104 (unsigned long long)NFS_FILEID(inode), status);
1da177e4
LT		 1105 if (status == -ESTALE) {
1106 nfs_zap_caches(inode);
1107 if (!S_ISDIR(inode->i_mode))
3a10c30a 1108 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1da177e4 1109 }
14c43f76 1110 goto err_out;
1da177e4
LT		 1111 }
1112
a3cba2aa 1113 status = nfs_refresh_inode(inode, fattr);
1da177e4 1114 if (status) {
1e8968c5 1115 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1da177e4 1116 inode->i_sb->s_id,
1e8968c5 1117 (unsigned long long)NFS_FILEID(inode), status);
14c43f76 1118 goto err_out;
1da177e4 1119 }
55296809 1120
24aa1fe6 1121 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
ada70d94 1122 nfs_zap_acl_cache(inode);
55296809 1123
3da580aa
JL		 1124 nfs_setsecurity(inode, fattr, label);
1125
1e8968c5 1126 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1da177e4 1127 inode->i_sb->s_id,
1e8968c5 1128 (unsigned long long)NFS_FILEID(inode));
1da177e4 1129
14c43f76
DQ		 1130err_out:
1131 nfs4_label_free(label);
1132out:
a3cba2aa 1133 nfs_free_fattr(fattr);
f4ce1299 1134 trace_nfs_revalidate_inode_exit(inode, status);
1da177e4
LT		 1135 return status;
1136}
1137
43f291cd 1138int nfs_attribute_cache_expired(struct inode *inode)
d7cf8dd0 1139{
b4d2314b 1140 if (nfs_have_delegated_attributes(inode))
1da177e4 1141 return 0;
d7cf8dd0 1142 return nfs_attribute_timeout(inode);
1da177e4
LT		 1143}
1144
1145/**
1146 * nfs_revalidate_inode - Revalidate the inode attributes
1147 * @server - pointer to nfs_server struct
1148 * @inode - pointer to inode struct
1149 *
1150 * Updates inode attribute information by retrieving the data from the server.
1151 */
1152int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1153{
311324ad 1154 if (!nfs_need_revalidate_inode(inode))
1da177e4
LT		 1155 return NFS_STALE(inode) ? -ESTALE : 0;
1156 return __nfs_revalidate_inode(server, inode);
1157}
1c606fb7 1158EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1da177e4 1159
1cda707d 1160static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
717d44e8
TM		 1161{
1162 struct nfs_inode *nfsi = NFS_I(inode);
f8806c84
TM		 1163 int ret;
1164
717d44e8 1165 if (mapping->nrpages != 0) {
f8806c84
TM		 1166 if (S_ISREG(inode->i_mode)) {
1167 ret = nfs_sync_mapping(mapping);
1168 if (ret < 0)
1169 return ret;
1170 }
1171 ret = invalidate_inode_pages2(mapping);
717d44e8
TM		 1172 if (ret < 0)
1173 return ret;
1174 }
d529ef83
JL		 1175 if (S_ISDIR(inode->i_mode)) {
1176 spin_lock(&inode->i_lock);
717d44e8 1177 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
d529ef83
JL		 1178 spin_unlock(&inode->i_lock);
1179 }
717d44e8 1180 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
de242c0b 1181 nfs_fscache_wait_on_invalidate(inode);
f4ce1299 1182
1e8968c5
NV		 1183 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1184 inode->i_sb->s_id,
1185 (unsigned long long)NFS_FILEID(inode));
717d44e8
TM		 1186 return 0;
1187}
1188
1cd9cb05 1189bool nfs_mapping_need_revalidate_inode(struct inode *inode)
b4b1eadf 1190{
61540bf6
TM		 1191 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1192 NFS_STALE(inode);
b4b1eadf
TM		 1193}
1194
0d0def49
AV		 1195int nfs_revalidate_mapping_rcu(struct inode *inode)
1196{
1197 struct nfs_inode *nfsi = NFS_I(inode);
1198 unsigned long *bitlock = &nfsi->flags;
1199 int ret = 0;
1200
1201 if (IS_SWAPFILE(inode))
1202 goto out;
1203 if (nfs_mapping_need_revalidate_inode(inode)) {
1204 ret = -ECHILD;
1205 goto out;
1206 }
1207 spin_lock(&inode->i_lock);
1208 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1209 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1210 ret = -ECHILD;
1211 spin_unlock(&inode->i_lock);
1212out:
1213 return ret;
1214}
1215
717d44e8 1216/**
be527494 1217 * nfs_revalidate_mapping - Revalidate the pagecache
717d44e8
TM		 1218 * @inode - pointer to host inode
1219 * @mapping - pointer to mapping
717d44e8 1220 */
be527494
TM		 1221int nfs_revalidate_mapping(struct inode *inode,
1222 struct address_space *mapping)
717d44e8
TM		 1223{
1224 struct nfs_inode *nfsi = NFS_I(inode);
d529ef83 1225 unsigned long *bitlock = &nfsi->flags;
717d44e8 1226 int ret = 0;
dc59250c 1227
29418aa4
MG		 1228 /* swapfiles are not supposed to be shared. */
1229 if (IS_SWAPFILE(inode))
1230 goto out;
1231
b4b1eadf 1232 if (nfs_mapping_need_revalidate_inode(inode)) {
717d44e8
TM		 1233 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1234 if (ret < 0)
1235 goto out;
7d52e862 1236 }
d529ef83
JL		 1237
1238 /*
1239 * We must clear NFS_INO_INVALID_DATA first to ensure that
1240 * invalidations that come in while we're shooting down the mappings
1241 * are respected. But, that leaves a race window where one revalidator
1242 * can clear the flag, and then another checks it before the mapping
1243 * gets invalidated. Fix that by serializing access to this part of
1244 * the function.
1245 *
1246 * At the same time, we need to allow other tasks to see whether we
1247 * might be in the middle of invalidating the pages, so we only set
1248 * the bit lock here if it looks like we're going to be doing that.
1249 */
1250 for (;;) {
74316201
N		 1251 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1252 nfs_wait_bit_killable, TASK_KILLABLE);
d529ef83
JL		 1253 if (ret)
1254 goto out;
17dfeb91
TM		 1255 spin_lock(&inode->i_lock);
1256 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1257 spin_unlock(&inode->i_lock);
1258 continue;
1259 }
1260 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
d529ef83 1261 break;
d529ef83 1262 spin_unlock(&inode->i_lock);
17dfeb91 1263 goto out;
f4ce1299
TM		 1264 }
1265
17dfeb91 1266 set_bit(NFS_INO_INVALIDATING, bitlock);
4db72b40 1267 smp_wmb();
17dfeb91
TM		 1268 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1269 spin_unlock(&inode->i_lock);
1270 trace_nfs_invalidate_mapping_enter(inode);
be527494 1271 ret = nfs_invalidate_mapping(inode, mapping);
17dfeb91
TM		 1272 trace_nfs_invalidate_mapping_exit(inode, ret);
1273
d529ef83 1274 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
4e857c58 1275 smp_mb__after_atomic();
d529ef83 1276 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
cd9ae2b6 1277out:
44b11874 1278 return ret;
7d52e862
TM		 1279}
1280
ca0daa27 1281static bool nfs_file_has_writers(struct nfs_inode *nfsi)
874f9463 1282{
ca0daa27
TM		 1283 struct inode *inode = &nfsi->vfs_inode;
1284
1285 assert_spin_locked(&inode->i_lock);
1286
1287 if (!S_ISREG(inode->i_mode))
1288 return false;
1289 if (list_empty(&nfsi->open_files))
1290 return false;
1291 /* Note: This relies on nfsi->open_files being ordered with writers
1292 * being placed at the head of the list.
1293 * See nfs_inode_attach_open_context()
1294 */
1295 return (list_first_entry(&nfsi->open_files,
1296 struct nfs_open_context,
1297 list)->mode & FMODE_WRITE) == FMODE_WRITE;
874f9463
TM		 1298}
1299
651b0e70 1300static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
874f9463 1301{
651b0e70 1302 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
874f9463
TM		 1303}
1304
783b194c 1305static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
a895b4a1 1306{
9e6e70f8
TM		 1307 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1308 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
c472c07b 1309 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1eb5d98f 1310 inode_set_iversion_raw(inode, fattr->change_attr);
70ca8852 1311 if (S_ISDIR(inode->i_mode))
6edf9609 1312 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
70ca8852 1313 }
a895b4a1 1314 /* If we have atomic WCC data, we may update some attributes */
9e6e70f8
TM		 1315 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1316 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
27dc1cd3 1317 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
0a2dfbec 1318 inode->i_ctime = fattr->ctime;
27dc1cd3 1319 }
9e6e70f8
TM		 1320
1321 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1322 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1323 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
0a2dfbec 1324 inode->i_mtime = fattr->mtime;
27dc1cd3 1325 if (S_ISDIR(inode->i_mode))
6edf9609 1326 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
a895b4a1 1327 }
9e6e70f8
TM		 1328 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1329 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1330 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
a6b6d5b8 1331 && !nfs_have_writebacks(inode)) {
27dc1cd3 1332 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
27dc1cd3 1333 }
a895b4a1
TM		 1334}
1335
1da177e4 1336/**
33801147 1337 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1da177e4
LT		 1338 * @inode - pointer to inode
1339 * @fattr - updated attributes
1340 *
1341 * Verifies the attribute cache. If we have just changed the attributes,
1342 * so that fattr carries weak cache consistency data, then it may
1343 * also update the ctime/mtime/change_attribute.
1344 */
33801147 1345static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1da177e4
LT		 1346{
1347 struct nfs_inode *nfsi = NFS_I(inode);
1348 loff_t cur_size, new_isize;
2a3f5fd4 1349 unsigned long invalid = 0;
1da177e4 1350
dc59250c 1351
01da47bd
TM		 1352 if (nfs_have_delegated_attributes(inode))
1353 return 0;
ca62b9c3 1354 /* Has the inode gone and changed behind our back? */
9e6e70f8 1355 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
cc89684c 1356 return -ESTALE;
9e6e70f8 1357 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
cc89684c 1358 return -ESTALE;
ca62b9c3 1359
651b0e70 1360 if (!nfs_file_has_buffered_writers(nfsi)) {
ca0daa27 1361 /* Verify a few of the more important attributes */
c472c07b 1362 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
16e14375
TM		 1363 invalid |= NFS_INO_INVALID_CHANGE
1364 | NFS_INO_REVAL_PAGECACHE;
1da177e4 1365
ca0daa27 1366 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
16e14375 1367 invalid |= NFS_INO_INVALID_MTIME;
ca62b9c3 1368
ca0daa27 1369 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&inode->i_ctime, &fattr->ctime))
16e14375 1370 invalid |= NFS_INO_INVALID_CTIME;
ca0daa27
TM		 1371
1372 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1373 cur_size = i_size_read(inode);
1374 new_isize = nfs_size_to_loff_t(fattr->size);
1375 if (cur_size != new_isize)
16e14375
TM		 1376 invalid |= NFS_INO_INVALID_SIZE
1377 | NFS_INO_REVAL_PAGECACHE;
ca0daa27 1378 }
9e6e70f8 1379 }
1da177e4
LT		 1380
1381 /* Have any file permissions changed? */
9e6e70f8 1382 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
16e14375
TM		 1383 invalid |= NFS_INO_INVALID_ACCESS
1384 | NFS_INO_INVALID_ACL
1385 | NFS_INO_INVALID_OTHER;
9ff593c4 1386 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
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_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
16e14375
TM		 1391 invalid |= NFS_INO_INVALID_ACCESS
1392 | NFS_INO_INVALID_ACL
1393 | NFS_INO_INVALID_OTHER;
1da177e4
LT		 1394
1395 /* Has the link count changed? */
9e6e70f8 1396 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
16e14375 1397 invalid |= NFS_INO_INVALID_OTHER;
1da177e4 1398
9e6e70f8 1399 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
2a3f5fd4
TM		 1400 invalid |= NFS_INO_INVALID_ATIME;
1401
1402 if (invalid != 0)
1ad13dbc 1403 nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED);
1da177e4 1404
33801147 1405 nfsi->read_cache_jiffies = fattr->time_start;
1da177e4
LT		 1406 return 0;
1407}
1408
ae05f269 1409static atomic_long_t nfs_attr_generation_counter;
4704f0e2
TM		 1410
1411static unsigned long nfs_read_attr_generation_counter(void)
1412{
ae05f269 1413 return atomic_long_read(&nfs_attr_generation_counter);
4704f0e2
TM		 1414}
1415
1416unsigned long nfs_inc_attr_generation_counter(void)
1417{
ae05f269 1418 return atomic_long_inc_return(&nfs_attr_generation_counter);
4704f0e2 1419}
3235b403 1420EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
4704f0e2
TM		 1421
1422void nfs_fattr_init(struct nfs_fattr *fattr)
1423{
1424 fattr->valid = 0;
1425 fattr->time_start = jiffies;
1426 fattr->gencount = nfs_inc_attr_generation_counter();
6926afd1
TM		 1427 fattr->owner_name = NULL;
1428 fattr->group_name = NULL;
4704f0e2 1429}
ddda8e0a 1430EXPORT_SYMBOL_GPL(nfs_fattr_init);
4704f0e2 1431
140e049c
TM		 1432/**
1433 * nfs_fattr_set_barrier
1434 * @fattr: attributes
1435 *
1436 * Used to set a barrier after an attribute was updated. This
1437 * barrier ensures that older attributes from RPC calls that may
1438 * have raced with our update cannot clobber these new values.
1439 * Note that you are still responsible for ensuring that other
1440 * operations which change the attribute on the server do not
1441 * collide.
1442 */
1443void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1444{
1445 fattr->gencount = nfs_inc_attr_generation_counter();
1446}
1447
2d36bfde
TM		 1448struct nfs_fattr *nfs_alloc_fattr(void)
1449{
1450 struct nfs_fattr *fattr;
1451
1452 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1453 if (fattr != NULL)
1454 nfs_fattr_init(fattr);
1455 return fattr;
1456}
ddda8e0a 1457EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
2d36bfde
TM		 1458
1459struct nfs_fh *nfs_alloc_fhandle(void)
1460{
1461 struct nfs_fh *fh;
1462
1463 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1464 if (fh != NULL)
1465 fh->size = 0;
1466 return fh;
1467}
ddda8e0a 1468EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
2d36bfde 1469
e27d359e 1470#ifdef NFS_DEBUG
d8e0539e
WAA		 1471/*
1472 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1473 * in the same way that wireshark does
1474 *
1475 * @fh: file handle
1476 *
1477 * For debugging only.
1478 */
1479u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1480{
1481 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1482 * not on the result */
1264a2f0 1483 return nfs_fhandle_hash(fh);
d8e0539e 1484}
9e6ee76d 1485EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
d8e0539e
WAA		 1486
1487/*
20d27e92
CL		 1488 * _nfs_display_fhandle - display an NFS file handle on the console
1489 *
1490 * @fh: file handle to display
1491 * @caption: display caption
1492 *
1493 * For debugging only.
1494 */
20d27e92
CL		 1495void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1496{
1497 unsigned short i;
1498
fa68a1ba 1499 if (fh == NULL || fh->size == 0) {
20d27e92
CL		 1500 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1501 return;
1502 }
1503
d8e0539e
WAA		 1504 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1505 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
20d27e92
CL		 1506 for (i = 0; i < fh->size; i += 16) {
1507 __be32 *pos = (__be32 *)&fh->data[i];
1508
1509 switch ((fh->size - i - 1) >> 2) {
1510 case 0:
1511 printk(KERN_DEFAULT " %08x\n",
1512 be32_to_cpup(pos));
1513 break;
1514 case 1:
1515 printk(KERN_DEFAULT " %08x %08x\n",
1516 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1517 break;
1518 case 2:
1519 printk(KERN_DEFAULT " %08x %08x %08x\n",
1520 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1521 be32_to_cpup(pos + 2));
1522 break;
1523 default:
1524 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1525 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1526 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1527 }
1528 }
1529}
9e6ee76d 1530EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
20d27e92
CL		 1531#endif
1532
a10ad176
TM		 1533/**
1534 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1535 * @inode - pointer to inode
1536 * @fattr - attributes
1537 *
1538 * Attempt to divine whether or not an RPC call reply carrying stale
1539 * attributes got scheduled after another call carrying updated ones.
1540 *
1541 * To do so, the function first assumes that a more recent ctime means
1542 * that the attributes in fattr are newer, however it also attempt to
1543 * catch the case where ctime either didn't change, or went backwards
1544 * (if someone reset the clock on the server) by looking at whether
1545 * or not this RPC call was started after the inode was last updated.
4704f0e2 1546 * Note also the check for wraparound of 'attr_gencount'
a10ad176
TM		 1547 *
1548 * The function returns 'true' if it thinks the attributes in 'fattr' are
1549 * more recent than the ones cached in the inode.
1550 *
1551 */
1552static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1553{
1554 const struct nfs_inode *nfsi = NFS_I(inode);
1555
4704f0e2 1556 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
4704f0e2 1557 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
a10ad176
TM		 1558}
1559
1560static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1561{
f4ce1299
TM		 1562 int ret;
1563
1564 trace_nfs_refresh_inode_enter(inode);
1565
a10ad176 1566 if (nfs_inode_attrs_need_update(inode, fattr))
f4ce1299
TM		 1567 ret = nfs_update_inode(inode, fattr);
1568 else
1569 ret = nfs_check_inode_attributes(inode, fattr);
1570
1571 trace_nfs_refresh_inode_exit(inode, ret);
1572 return ret;
870a5be8
TM		 1573}
1574
33801147
TM		 1575/**
1576 * nfs_refresh_inode - try to update the inode attribute cache
1577 * @inode - pointer to inode
1578 * @fattr - updated attributes
1579 *
1580 * Check that an RPC call that returned attributes has not overlapped with
1581 * other recent updates of the inode metadata, then decide whether it is
1582 * safe to do a full update of the inode attributes, or whether just to
1583 * call nfs_check_inode_attributes.
1584 */
1585int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1586{
33801147
TM		 1587 int status;
1588
1589 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1590 return 0;
1591 spin_lock(&inode->i_lock);
870a5be8 1592 status = nfs_refresh_inode_locked(inode, fattr);
33801147 1593 spin_unlock(&inode->i_lock);
ef79c097 1594
33801147
TM		 1595 return status;
1596}
ddda8e0a 1597EXPORT_SYMBOL_GPL(nfs_refresh_inode);
33801147 1598
16e14375
TM		 1599static int nfs_post_op_update_inode_locked(struct inode *inode,
1600 struct nfs_fattr *fattr, unsigned int invalid)
d65f557f 1601{
6edf9609
TM		 1602 if (S_ISDIR(inode->i_mode))
1603 invalid |= NFS_INO_INVALID_DATA;
1604 nfs_set_cache_invalid(inode, invalid);
d65f557f
TM		 1605 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1606 return 0;
1607 return nfs_refresh_inode_locked(inode, fattr);
1608}
1609
decf491f
TM		 1610/**
1611 * nfs_post_op_update_inode - try to update the inode attribute cache
1612 * @inode - pointer to inode
1613 * @fattr - updated attributes
1614 *
1615 * After an operation that has changed the inode metadata, mark the
1616 * attribute cache as being invalid, then try to update it.
f551e44f
CL		 1617 *
1618 * NB: if the server didn't return any post op attributes, this
1619 * function will force the retrieval of attributes before the next
1620 * NFS request. Thus it should be used only for operations that
1621 * are expected to change one or more attributes, to avoid
1622 * unnecessary NFS requests and trips through nfs_update_inode().
decf491f
TM		 1623 */
1624int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1625{
d65f557f 1626 int status;
decf491f 1627
7668fdbe 1628 spin_lock(&inode->i_lock);
92d64e47 1629 nfs_fattr_set_barrier(fattr);
16e14375
TM		 1630 status = nfs_post_op_update_inode_locked(inode, fattr,
1631 NFS_INO_INVALID_CHANGE
1632 | NFS_INO_INVALID_CTIME);
7668fdbe 1633 spin_unlock(&inode->i_lock);
aa9c2669 1634
870a5be8 1635 return status;
decf491f 1636}
1c606fb7 1637EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
decf491f 1638
70ca8852 1639/**
a08a8cd3 1640 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
70ca8852
TM		 1641 * @inode - pointer to inode
1642 * @fattr - updated attributes
1643 *
1644 * After an operation that has changed the inode metadata, mark the
1645 * attribute cache as being invalid, then try to update it. Fake up
1646 * weak cache consistency data, if none exist.
1647 *
1648 * This function is mainly designed to be used by the ->write_done() functions.
1649 */
a08a8cd3 1650int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
70ca8852 1651{
d65f557f
TM		 1652 int status;
1653
d65f557f
TM		 1654 /* Don't do a WCC update if these attributes are already stale */
1655 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1656 !nfs_inode_attrs_need_update(inode, fattr)) {
9e6e70f8
TM		 1657 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1658 | NFS_ATTR_FATTR_PRESIZE
1659 | NFS_ATTR_FATTR_PREMTIME
1660 | NFS_ATTR_FATTR_PRECTIME);
d65f557f
TM		 1661 goto out_noforce;
1662 }
9e6e70f8
TM		 1663 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1664 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1eb5d98f 1665 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
9e6e70f8 1666 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
70ca8852 1667 }
9e6e70f8
TM		 1668 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1669 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
0a2dfbec 1670 fattr->pre_ctime = inode->i_ctime;
9e6e70f8
TM		 1671 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1672 }
1673 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1674 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
0a2dfbec 1675 fattr->pre_mtime = inode->i_mtime;
9e6e70f8
TM		 1676 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1677 }
1678 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1679 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
a3d01454 1680 fattr->pre_size = i_size_read(inode);
9e6e70f8 1681 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
70ca8852 1682 }
d65f557f 1683out_noforce:
16e14375
TM		 1684 status = nfs_post_op_update_inode_locked(inode, fattr,
1685 NFS_INO_INVALID_CHANGE
1686 | NFS_INO_INVALID_CTIME
1687 | NFS_INO_INVALID_MTIME);
a08a8cd3
TM		 1688 return status;
1689}
1690
1691/**
1692 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1693 * @inode - pointer to inode
1694 * @fattr - updated attributes
1695 *
1696 * After an operation that has changed the inode metadata, mark the
1697 * attribute cache as being invalid, then try to update it. Fake up
1698 * weak cache consistency data, if none exist.
1699 *
1700 * This function is mainly designed to be used by the ->write_done() functions.
1701 */
1702int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1703{
1704 int status;
1705
1706 spin_lock(&inode->i_lock);
8f8ba1d7 1707 nfs_fattr_set_barrier(fattr);
a08a8cd3 1708 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
d65f557f
TM		 1709 spin_unlock(&inode->i_lock);
1710 return status;
70ca8852 1711}
ddda8e0a 1712EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
70ca8852 1713
ea96d1ec
AS		 1714
1715static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1716 struct nfs_fattr *fattr)
1717{
1718 bool ret1 = true, ret2 = true;
1719
1720 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1721 ret1 = (nfsi->fileid == fattr->fileid);
1722 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1723 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1724 return ret1 || ret2;
1725}
1726
1da177e4
LT		 1727/*
1728 * Many nfs protocol calls return the new file attributes after
1729 * an operation. Here we update the inode to reflect the state
1730 * of the server's inode.
1731 *
1732 * This is a bit tricky because we have to make sure all dirty pages
1733 * have been sent off to the server before calling invalidate_inode_pages.
1734 * To make sure no other process adds more write requests while we try
1735 * our best to flush them, we make them sleep during the attribute refresh.
1736 *
1737 * A very similar scenario holds for the dir cache.
1738 */
24aa1fe6 1739static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1da177e4 1740{
8b4bdcf8 1741 struct nfs_server *server;
1da177e4 1742 struct nfs_inode *nfsi = NFS_I(inode);
951a143b 1743 loff_t cur_isize, new_isize;
2a3f5fd4 1744 unsigned long invalid = 0;
3e7d950a 1745 unsigned long now = jiffies;
62ab460c 1746 unsigned long save_cache_validity;
651b0e70 1747 bool have_writers = nfs_file_has_buffered_writers(nfsi);
944171cb 1748 bool cache_revalidated = true;
1da177e4 1749
1e8968c5 1750 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
3110ff80 1751 __func__, inode->i_sb->s_id, inode->i_ino,
4f1abd22 1752 nfs_display_fhandle_hash(NFS_FH(inode)),
1da177e4
LT		 1753 atomic_read(&inode->i_count), fattr->valid);
1754
ea96d1ec 1755 if (!nfs_fileid_valid(nfsi, fattr)) {
e73e6c9e
MT		 1756 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1757 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1758 NFS_SERVER(inode)->nfs_client->cl_hostname,
1759 inode->i_sb->s_id, (long long)nfsi->fileid,
1760 (long long)fattr->fileid);
1761 goto out_err;
1762 }
1da177e4
LT		 1763
1764 /*
1765 * Make sure the inode's type hasn't changed.
1766 */
e73e6c9e
MT		 1767 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1768 /*
1769 * Big trouble! The inode has become a different object.
1770 */
1e8968c5 1771 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
e73e6c9e
MT		 1772 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1773 goto out_err;
1774 }
1da177e4 1775
8b4bdcf8 1776 server = NFS_SERVER(inode);
a0356862 1777 /* Update the fsid? */
9e6e70f8 1778 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
c37dcd33 1779 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
36d43a43 1780 !IS_AUTOMOUNT(inode))
8b4bdcf8
TM		 1781 server->fsid = fattr->fsid;
1782
1da177e4
LT		 1783 /*
1784 * Update the read time so we don't revalidate too often.
1785 */
33801147 1786 nfsi->read_cache_jiffies = fattr->time_start;
3e7d950a 1787
62ab460c
TM		 1788 save_cache_validity = nfsi->cache_validity;
1789 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1790 | NFS_INO_INVALID_ATIME
1791 | NFS_INO_REVAL_FORCED
1792 | NFS_INO_REVAL_PAGECACHE);
1da177e4 1793
a895b4a1 1794 /* Do atomic weak cache consistency updates */
783b194c 1795 nfs_wcc_update_inode(inode, fattr);
a895b4a1 1796
944171cb
BC		 1797 if (pnfs_layoutcommit_outstanding(inode)) {
1798 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1799 cache_revalidated = false;
1800 }
10b7e9ad 1801
47aabaa7 1802 /* More cache consistency checks */
9e6e70f8 1803 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
c472c07b 1804 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
9e6e70f8
TM		 1805 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1806 inode->i_sb->s_id, inode->i_ino);
38512aa9 1807 /* Could it be a race with writeback? */
ca0daa27 1808 if (!have_writers) {
16e14375 1809 invalid |= NFS_INO_INVALID_CHANGE
38512aa9
TM		 1810 | NFS_INO_INVALID_DATA
1811 | NFS_INO_INVALID_ACCESS
1812 | NFS_INO_INVALID_ACL;
cac88f94 1813 /* Force revalidate of all attributes */
16e14375
TM		 1814 save_cache_validity |= NFS_INO_INVALID_CTIME
1815 | NFS_INO_INVALID_MTIME
1816 | NFS_INO_INVALID_SIZE
1817 | NFS_INO_INVALID_OTHER;
38512aa9
TM		 1818 if (S_ISDIR(inode->i_mode))
1819 nfs_force_lookup_revalidate(inode);
1820 }
1eb5d98f 1821 inode_set_iversion_raw(inode, fattr->change_attr);
9e6e70f8 1822 }
ade14a7d 1823 } else {
8619ddd0 1824 nfsi->cache_validity |= save_cache_validity &
16e14375 1825 (NFS_INO_INVALID_CHANGE
8619ddd0
TM		 1826 | NFS_INO_REVAL_PAGECACHE
1827 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1828 cache_revalidated = false;
1829 }
9e6e70f8
TM		 1830
1831 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
0a2dfbec 1832 inode->i_mtime = fattr->mtime;
ade14a7d 1833 } else if (server->caps & NFS_CAP_MTIME) {
43b6535e 1834 nfsi->cache_validity |= save_cache_validity &
16e14375 1835 (NFS_INO_INVALID_MTIME
62ab460c 1836 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1837 cache_revalidated = false;
1838 }
62ab460c 1839
9e6e70f8 1840 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
0a2dfbec 1841 inode->i_ctime = fattr->ctime;
ade14a7d 1842 } else if (server->caps & NFS_CAP_CTIME) {
43b6535e 1843 nfsi->cache_validity |= save_cache_validity &
16e14375 1844 (NFS_INO_INVALID_CTIME
62ab460c 1845 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1846 cache_revalidated = false;
1847 }
47aabaa7 1848
951a143b 1849 /* Check if our cached file size is stale */
9e6e70f8
TM		 1850 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1851 new_isize = nfs_size_to_loff_t(fattr->size);
1852 cur_isize = i_size_read(inode);
1853 if (new_isize != cur_isize) {
1854 /* Do we perhaps have any outstanding writes, or has
1855 * the file grown beyond our last write? */
a6b6d5b8 1856 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
9e6e70f8 1857 i_size_write(inode, new_isize);
ca0daa27 1858 if (!have_writers)
16e14375 1859 invalid |= NFS_INO_INVALID_DATA;
9e6e70f8 1860 }
60c16ea8
HJ		 1861 dprintk("NFS: isize change on server for file %s/%ld "
1862 "(%Ld to %Ld)\n",
1863 inode->i_sb->s_id,
1864 inode->i_ino,
1865 (long long)cur_isize,
1866 (long long)new_isize);
1da177e4 1867 }
ade14a7d 1868 } else {
43b6535e 1869 nfsi->cache_validity |= save_cache_validity &
16e14375 1870 (NFS_INO_INVALID_SIZE
62ab460c
TM		 1871 | NFS_INO_REVAL_PAGECACHE
1872 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1873 cache_revalidated = false;
1874 }
1da177e4 1875
1da177e4 1876
9e6e70f8 1877 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
0a2dfbec 1878 inode->i_atime = fattr->atime;
ade14a7d 1879 else if (server->caps & NFS_CAP_ATIME) {
43b6535e
TM		 1880 nfsi->cache_validity |= save_cache_validity &
1881 (NFS_INO_INVALID_ATIME
62ab460c 1882 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1883 cache_revalidated = false;
1884 }
1da177e4 1885
9e6e70f8
TM		 1886 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1887 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
9b4b3513
TM		 1888 umode_t newmode = inode->i_mode & S_IFMT;
1889 newmode |= fattr->mode & S_IALLUGO;
1890 inode->i_mode = newmode;
16e14375
TM		 1891 invalid |= NFS_INO_INVALID_ACCESS
1892 | NFS_INO_INVALID_ACL
1893 | NFS_INO_INVALID_OTHER;
9e6e70f8 1894 }
ade14a7d 1895 } else if (server->caps & NFS_CAP_MODE) {
43b6535e 1896 nfsi->cache_validity |= save_cache_validity &
16e14375 1897 (NFS_INO_INVALID_ACCESS
62ab460c 1898 | NFS_INO_INVALID_ACL
16e14375 1899 | NFS_INO_INVALID_OTHER
62ab460c 1900 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1901 cache_revalidated = false;
1902 }
62ab460c 1903
9e6e70f8 1904 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
9ff593c4 1905 if (!uid_eq(inode->i_uid, fattr->uid)) {
16e14375
TM		 1906 invalid |= NFS_INO_INVALID_ACCESS
1907 | NFS_INO_INVALID_ACL
1908 | NFS_INO_INVALID_OTHER;
9e6e70f8
TM		 1909 inode->i_uid = fattr->uid;
1910 }
ade14a7d 1911 } else if (server->caps & NFS_CAP_OWNER) {
43b6535e 1912 nfsi->cache_validity |= save_cache_validity &
16e14375 1913 (NFS_INO_INVALID_ACCESS
62ab460c 1914 | NFS_INO_INVALID_ACL
16e14375 1915 | NFS_INO_INVALID_OTHER
62ab460c 1916 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1917 cache_revalidated = false;
1918 }
62ab460c 1919
9e6e70f8 1920 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
9ff593c4 1921 if (!gid_eq(inode->i_gid, fattr->gid)) {
16e14375
TM		 1922 invalid |= NFS_INO_INVALID_ACCESS
1923 | NFS_INO_INVALID_ACL
1924 | NFS_INO_INVALID_OTHER;
9e6e70f8
TM		 1925 inode->i_gid = fattr->gid;
1926 }
ade14a7d 1927 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
43b6535e 1928 nfsi->cache_validity |= save_cache_validity &
16e14375 1929 (NFS_INO_INVALID_ACCESS
62ab460c 1930 | NFS_INO_INVALID_ACL
16e14375 1931 | NFS_INO_INVALID_OTHER
62ab460c 1932 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1933 cache_revalidated = false;
1934 }
921615f1 1935
9e6e70f8
TM		 1936 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1937 if (inode->i_nlink != fattr->nlink) {
16e14375 1938 invalid |= NFS_INO_INVALID_OTHER;
9e6e70f8
TM		 1939 if (S_ISDIR(inode->i_mode))
1940 invalid |= NFS_INO_INVALID_DATA;
bfe86848 1941 set_nlink(inode, fattr->nlink);
9e6e70f8 1942 }
ade14a7d 1943 } else if (server->caps & NFS_CAP_NLINK) {
43b6535e 1944 nfsi->cache_validity |= save_cache_validity &
16e14375 1945 (NFS_INO_INVALID_OTHER
62ab460c 1946 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1947 cache_revalidated = false;
1948 }
1da177e4 1949
9e6e70f8 1950 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 1951 /*
1952 * report the blocks in 512byte units
1953 */
1954 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
ade14a7d 1955 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
9e6e70f8 1956 inode->i_blocks = fattr->du.nfs2.blocks;
ade14a7d
TM		 1957 else
1958 cache_revalidated = false;
1da177e4
LT		 1959
1960 /* Update attrtimeo value if we're out of the unstable period */
fd1defc2 1961 if (invalid & NFS_INO_INVALID_ATTR) {
cac88f94 1962 invalid &= ~NFS_INO_INVALID_ATTR;
91d5b470 1963 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1da177e4 1964 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
3e7d950a 1965 nfsi->attrtimeo_timestamp = now;
f5062003 1966 /* Set barrier to be more recent than all outstanding updates */
4704f0e2 1967 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
6d2b2966 1968 } else {
ade14a7d
TM		 1969 if (cache_revalidated) {
1970 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
1971 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1972 nfsi->attrtimeo <<= 1;
1973 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
1974 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1975 }
6d2b2966
TM		 1976 nfsi->attrtimeo_timestamp = now;
1977 }
f5062003
TM		 1978 /* Set the barrier to be more recent than this fattr */
1979 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
1980 nfsi->attr_gencount = fattr->gencount;
1da177e4 1981 }
c812012f 1982
1da177e4
LT		 1983 /* Don't invalidate the data if we were to blame */
1984 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1985 || S_ISLNK(inode->i_mode)))
1986 invalid &= ~NFS_INO_INVALID_DATA;
011e2a7f 1987 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
62ab460c 1988 (save_cache_validity & NFS_INO_REVAL_FORCED))
6edf9609 1989 nfs_set_cache_invalid(inode, invalid);
de242c0b 1990
1da177e4 1991 return 0;
b37b03b7 1992 out_err:
1da177e4
LT		 1993 /*
1994 * No need to worry about unhashing the dentry, as the
1995 * lookup validation will know that the inode is bad.
1996 * (But we fall through to invalidate the caches.)
1997 */
1998 nfs_invalidate_inode(inode);
1da177e4
LT		 1999 return -ESTALE;
2000}
2001
f7b422b1 2002struct inode *nfs_alloc_inode(struct super_block *sb)
1da177e4
LT		 2003{
2004 struct nfs_inode *nfsi;
c456aacf 2005 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1da177e4
LT		 2006 if (!nfsi)
2007 return NULL;
55296809
CL		 2008 nfsi->flags = 0UL;
2009 nfsi->cache_validity = 0UL;
89d77c8f 2010#if IS_ENABLED(CONFIG_NFS_V4)
e50a1c2e
BF		 2011 nfsi->nfs4_acl = NULL;
2012#endif /* CONFIG_NFS_V4 */
1da177e4
LT		 2013 return &nfsi->vfs_inode;
2014}
89d77c8f 2015EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1da177e4 2016
fa0d7e3d 2017static void nfs_i_callback(struct rcu_head *head)
1da177e4 2018{
fa0d7e3d 2019 struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4
LT		 2020 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2021}
2022
fa0d7e3d
NP		 2023void nfs_destroy_inode(struct inode *inode)
2024{
2025 call_rcu(&inode->i_rcu, nfs_i_callback);
2026}
89d77c8f 2027EXPORT_SYMBOL_GPL(nfs_destroy_inode);
fa0d7e3d 2028
d75d5414
AM		 2029static inline void nfs4_init_once(struct nfs_inode *nfsi)
2030{
89d77c8f 2031#if IS_ENABLED(CONFIG_NFS_V4)
d75d5414
AM		 2032 INIT_LIST_HEAD(&nfsi->open_states);
2033 nfsi->delegation = NULL;
d75d5414 2034 init_rwsem(&nfsi->rwsem);
e5e94017 2035 nfsi->layout = NULL;
d75d5414
AM		 2036#endif
2037}
f7b422b1 2038
51cc5068 2039static void init_once(void *foo)
1da177e4
LT		 2040{
2041 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2042
a35afb83 2043 inode_init_once(&nfsi->vfs_inode);
a35afb83
CL		 2044 INIT_LIST_HEAD(&nfsi->open_files);
2045 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2046 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
ea2cf228 2047 INIT_LIST_HEAD(&nfsi->commit_info.list);
a6b6d5b8 2048 atomic_long_set(&nfsi->nrequests, 0);
5cb953d4 2049 atomic_long_set(&nfsi->commit_info.ncommit, 0);
1a0de48a 2050 atomic_set(&nfsi->commit_info.rpcs_out, 0);
884be175 2051 init_rwsem(&nfsi->rmdir_sem);
e824f99a 2052 mutex_init(&nfsi->commit_mutex);
a35afb83 2053 nfs4_init_once(nfsi);
1da177e4 2054}
20c2df83 2055
f7b422b1 2056static int __init nfs_init_inodecache(void)
1da177e4
LT		 2057{
2058 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2059 sizeof(struct nfs_inode),
fffb60f9 2060 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 2061 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 2062 init_once);
1da177e4
LT		 2063 if (nfs_inode_cachep == NULL)
2064 return -ENOMEM;
2065
2066 return 0;
2067}
2068
266bee88 2069static void nfs_destroy_inodecache(void)
1da177e4 2070{
8c0a8537
KS		 2071 /*
2072 * Make sure all delayed rcu free inodes are flushed before we
2073 * destroy cache.
2074 */
2075 rcu_barrier();
1a1d92c1 2076 kmem_cache_destroy(nfs_inode_cachep);
1da177e4
LT		 2077}
2078
5746006f 2079struct workqueue_struct *nfsiod_workqueue;
89d77c8f 2080EXPORT_SYMBOL_GPL(nfsiod_workqueue);
5746006f
TM		 2081
2082/*
2083 * start up the nfsiod workqueue
2084 */
2085static int nfsiod_start(void)
2086{
2087 struct workqueue_struct *wq;
2088 dprintk("RPC: creating workqueue nfsiod\n");
ada609ee 2089 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
5746006f
TM		 2090 if (wq == NULL)
2091 return -ENOMEM;
2092 nfsiod_workqueue = wq;
2093 return 0;
2094}
2095
2096/*
2097 * Destroy the nfsiod workqueue
2098 */
2099static void nfsiod_stop(void)
2100{
2101 struct workqueue_struct *wq;
2102
2103 wq = nfsiod_workqueue;
2104 if (wq == NULL)
2105 return;
2106 nfsiod_workqueue = NULL;
2107 destroy_workqueue(wq);
2108}
2109
c7d03a00 2110unsigned int nfs_net_id;
9e2e74db 2111EXPORT_SYMBOL_GPL(nfs_net_id);
1b340d01
SK		 2112
2113static int nfs_net_init(struct net *net)
2114{
6b13168b 2115 nfs_clients_init(net);
65b38851 2116 return nfs_fs_proc_net_init(net);
1b340d01
SK		 2117}
2118
2119static void nfs_net_exit(struct net *net)
2120{
b0b5352d
VA		 2121 struct nfs_net *nn = net_generic(net, nfs_net_id);
2122
65b38851 2123 nfs_fs_proc_net_exit(net);
28cd1b3f 2124 nfs_cleanup_cb_ident_idr(net);
b0b5352d
VA		 2125 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
2126 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
1b340d01
SK		 2127}
2128
2129static struct pernet_operations nfs_net_ops = {
2130 .init = nfs_net_init,
2131 .exit = nfs_net_exit,
2132 .id = &nfs_net_id,
2133 .size = sizeof(struct nfs_net),
2134};
2135
1da177e4
LT		 2136/*
2137 * Initialize NFS
2138 */
2139static int __init init_nfs_fs(void)
2140{
2141 int err;
2142
1b340d01 2143 err = register_pernet_subsys(&nfs_net_ops);
e571cbf1 2144 if (err < 0)
89d77c8f 2145 goto out9;
e571cbf1 2146
8ec442ae
DH		 2147 err = nfs_fscache_register();
2148 if (err < 0)
89d77c8f 2149 goto out8;
8ec442ae 2150
5746006f
TM		 2151 err = nfsiod_start();
2152 if (err)
89d77c8f 2153 goto out7;
5746006f 2154
6aaca566
DH		 2155 err = nfs_fs_proc_init();
2156 if (err)
89d77c8f 2157 goto out6;
6aaca566 2158
1da177e4
LT		 2159 err = nfs_init_nfspagecache();
2160 if (err)
89d77c8f 2161 goto out5;
1da177e4
LT		 2162
2163 err = nfs_init_inodecache();
2164 if (err)
89d77c8f 2165 goto out4;
1da177e4
LT		 2166
2167 err = nfs_init_readpagecache();
2168 if (err)
89d77c8f 2169 goto out3;
1da177e4
LT		 2170
2171 err = nfs_init_writepagecache();
2172 if (err)
89d77c8f 2173 goto out2;
1da177e4 2174
1da177e4
LT		 2175 err = nfs_init_directcache();
2176 if (err)
89d77c8f 2177 goto out1;
1da177e4 2178
ec7652aa 2179 rpc_proc_register(&init_net, &nfs_rpcstat);
cd738ee9
KM		 2180
2181 err = register_nfs_fs();
2182 if (err)
129d1977
BS		 2183 goto out0;
2184
1da177e4 2185 return 0;
129d1977 2186out0:
ec7652aa 2187 rpc_proc_unregister(&init_net, "nfs");
1da177e4 2188 nfs_destroy_directcache();
89d77c8f 2189out1:
129d1977 2190 nfs_destroy_writepagecache();
89d77c8f 2191out2:
129d1977 2192 nfs_destroy_readpagecache();
89d77c8f 2193out3:
129d1977 2194 nfs_destroy_inodecache();
89d77c8f 2195out4:
129d1977 2196 nfs_destroy_nfspagecache();
89d77c8f 2197out5:
129d1977 2198 nfs_fs_proc_exit();
89d77c8f 2199out6:
129d1977 2200 nfsiod_stop();
89d77c8f 2201out7:
129d1977 2202 nfs_fscache_unregister();
89d77c8f 2203out8:
129d1977 2204 unregister_pernet_subsys(&nfs_net_ops);
89d77c8f 2205out9:
1da177e4
LT		 2206 return err;
2207}
2208
2209static void __exit exit_nfs_fs(void)
2210{
1da177e4 2211 nfs_destroy_directcache();
1da177e4
LT		 2212 nfs_destroy_writepagecache();
2213 nfs_destroy_readpagecache();
2214 nfs_destroy_inodecache();
2215 nfs_destroy_nfspagecache();
8ec442ae 2216 nfs_fscache_unregister();
1b340d01 2217 unregister_pernet_subsys(&nfs_net_ops);
ec7652aa 2218 rpc_proc_unregister(&init_net, "nfs");
f7b422b1 2219 unregister_nfs_fs();
6aaca566 2220 nfs_fs_proc_exit();
5746006f 2221 nfsiod_stop();
1da177e4
LT		 2222}
2223
2224/* Not quite true; I just maintain it */
2225MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2226MODULE_LICENSE("GPL");
f43bf0be 2227module_param(enable_ino64, bool, 0644);
1da177e4
LT		 2228
2229module_init(init_nfs_fs)
2230module_exit(exit_nfs_fs)
Linux 6.x block layer and io_uring tree(s)