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Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-block.git] / fs / nfs / inode.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/nfs/inode.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs inode and superblock handling functions
7 *
526719ba 8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
1da177e4
LT		 9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
10 *
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
13 *
14 */
15
1da177e4
LT		 16#include <linux/module.h>
17#include <linux/init.h>
174cd4b1 18#include <linux/sched/signal.h>
1da177e4
LT		 19#include <linux/time.h>
20#include <linux/kernel.h>
21#include <linux/mm.h>
22#include <linux/string.h>
23#include <linux/stat.h>
24#include <linux/errno.h>
25#include <linux/unistd.h>
26#include <linux/sunrpc/clnt.h>
27#include <linux/sunrpc/stats.h>
4ece3a2d 28#include <linux/sunrpc/metrics.h>
1da177e4
LT		 29#include <linux/nfs_fs.h>
30#include <linux/nfs_mount.h>
31#include <linux/nfs4_mount.h>
32#include <linux/lockd/bind.h>
1da177e4
LT		 33#include <linux/seq_file.h>
34#include <linux/mount.h>
1da177e4 35#include <linux/vfs.h>
9cdb3883
MN		 36#include <linux/inet.h>
37#include <linux/nfs_xdr.h>
5a0e3ad6 38#include <linux/slab.h>
3fa0b4e2 39#include <linux/compat.h>
d310310c 40#include <linux/freezer.h>
7c0f6ba6 41#include <linux/uaccess.h>
1eb5d98f 42#include <linux/iversion.h>
1da177e4 43
4ce79717 44#include "nfs4_fs.h"
a72b4422 45#include "callback.h"
1da177e4 46#include "delegation.h"
d9ef5a8c 47#include "iostat.h"
f7b422b1 48#include "internal.h"
8ec442ae 49#include "fscache.h"
e5e94017 50#include "pnfs.h"
ab7017a3 51#include "nfs.h"
1b340d01 52#include "netns.h"
1da177e4 53
f4ce1299
TM		 54#include "nfstrace.h"
55
1da177e4 56#define NFSDBG_FACILITY NFSDBG_VFS
1da177e4 57
f43bf0be
TM		 58#define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
59
60/* Default is to see 64-bit inode numbers */
90ab5ee9 61static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
f43bf0be 62
1da177e4 63static void nfs_invalidate_inode(struct inode *);
24aa1fe6 64static int nfs_update_inode(struct inode *, struct nfs_fattr *);
1da177e4 65
e18b890b 66static struct kmem_cache * nfs_inode_cachep;
b7fa0554 67
1da177e4
LT		 68static inline unsigned long
69nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
70{
71 return nfs_fileid_to_ino_t(fattr->fileid);
72}
73
210c7c17 74static int nfs_wait_killable(int mode)
72cb77f4 75{
416ad3c9 76 freezable_schedule_unsafe();
dfd01f02
PZ		 77 if (signal_pending_state(mode, current))
78 return -ERESTARTSYS;
72cb77f4
TM		 79 return 0;
80}
210c7c17
BC		 81
82int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
83{
84 return nfs_wait_killable(mode);
85}
89d77c8f 86EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
72cb77f4 87
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);
3f0b3cf4
TM		 198 bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
199
200 if (have_delegation) {
201 if (!(flags & NFS_INO_REVAL_FORCED))
202 flags &= ~NFS_INO_INVALID_OTHER;
203 flags &= ~(NFS_INO_INVALID_CHANGE
204 | NFS_INO_INVALID_SIZE
205 | NFS_INO_REVAL_PAGECACHE);
206 }
6edf9609
TM		 207
208 if (inode->i_mapping->nrpages == 0)
209 flags &= ~NFS_INO_INVALID_DATA;
210 nfsi->cache_validity |= flags;
211 if (flags & NFS_INO_INVALID_DATA)
212 nfs_fscache_invalidate(inode);
213}
214
1da177e4
LT		 215/*
216 * Invalidate the local caches
217 */
b37b03b7 218static void nfs_zap_caches_locked(struct inode *inode)
1da177e4
LT		 219{
220 struct nfs_inode *nfsi = NFS_I(inode);
221 int mode = inode->i_mode;
222
91d5b470
CL		 223 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
224
c7c20973
TM		 225 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
226 nfsi->attrtimeo_timestamp = jiffies;
1da177e4 227
c3f52af3 228 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
de242c0b 229 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
6edf9609 230 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 231 | NFS_INO_INVALID_DATA
232 | NFS_INO_INVALID_ACCESS
233 | NFS_INO_INVALID_ACL
6edf9609 234 | NFS_INO_REVAL_PAGECACHE);
aa9c2669 235 } else
6edf9609 236 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 237 | NFS_INO_INVALID_ACCESS
238 | NFS_INO_INVALID_ACL
6edf9609 239 | NFS_INO_REVAL_PAGECACHE);
fd1defc2 240 nfs_zap_label_cache_locked(nfsi);
b37b03b7 241}
dc59250c 242
b37b03b7
TM		 243void nfs_zap_caches(struct inode *inode)
244{
245 spin_lock(&inode->i_lock);
246 nfs_zap_caches_locked(inode);
dc59250c 247 spin_unlock(&inode->i_lock);
ada70d94
TM		 248}
249
cd9ae2b6
TM		 250void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
251{
252 if (mapping->nrpages != 0) {
253 spin_lock(&inode->i_lock);
6edf9609 254 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
cd9ae2b6
TM		 255 spin_unlock(&inode->i_lock);
256 }
257}
258
f41f7418 259void nfs_zap_acl_cache(struct inode *inode)
ada70d94
TM		 260{
261 void (*clear_acl_cache)(struct inode *);
262
263 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
264 if (clear_acl_cache != NULL)
265 clear_acl_cache(inode);
dc59250c 266 spin_lock(&inode->i_lock);
55296809 267 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
dc59250c 268 spin_unlock(&inode->i_lock);
1da177e4 269}
1c606fb7 270EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
1da177e4 271
c4812998
TM		 272void nfs_invalidate_atime(struct inode *inode)
273{
274 spin_lock(&inode->i_lock);
6edf9609 275 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
c4812998
TM		 276 spin_unlock(&inode->i_lock);
277}
ddda8e0a 278EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
c4812998 279
1da177e4 280/*
b37b03b7
TM		 281 * Invalidate, but do not unhash, the inode.
282 * NB: must be called with inode->i_lock held!
1da177e4 283 */
b37b03b7 284static void nfs_invalidate_inode(struct inode *inode)
1da177e4 285{
3a10c30a 286 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
b37b03b7 287 nfs_zap_caches_locked(inode);
1da177e4
LT		 288}
289
290struct nfs_find_desc {
291 struct nfs_fh *fh;
292 struct nfs_fattr *fattr;
293};
294
295/*
296 * In NFSv3 we can have 64bit inode numbers. In order to support
297 * this, and re-exported directories (also seen in NFSv2)
298 * we are forced to allow 2 different inodes to have the same
299 * i_ino.
300 */
301static int
302nfs_find_actor(struct inode *inode, void *opaque)
303{
304 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
305 struct nfs_fh *fh = desc->fh;
306 struct nfs_fattr *fattr = desc->fattr;
307
308 if (NFS_FILEID(inode) != fattr->fileid)
309 return 0;
f6488c9b
JL		 310 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
311 return 0;
1da177e4
LT		 312 if (nfs_compare_fh(NFS_FH(inode), fh))
313 return 0;
314 if (is_bad_inode(inode) || NFS_STALE(inode))
315 return 0;
316 return 1;
317}
318
319static int
320nfs_init_locked(struct inode *inode, void *opaque)
321{
322 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
323 struct nfs_fattr *fattr = desc->fattr;
324
99fadcd7 325 set_nfs_fileid(inode, fattr->fileid);
916ec34d 326 inode->i_mode = fattr->mode;
1da177e4
LT		 327 nfs_copy_fh(NFS_FH(inode), desc->fh);
328 return 0;
329}
330
e058f70b 331#ifdef CONFIG_NFS_V4_SECURITY_LABEL
fd1defc2
TM		 332static void nfs_clear_label_invalid(struct inode *inode)
333{
334 spin_lock(&inode->i_lock);
335 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
336 spin_unlock(&inode->i_lock);
337}
338
aa9c2669
DQ		 339void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
340 struct nfs4_label *label)
341{
342 int error;
343
344 if (label == NULL)
345 return;
346
aa9c2669
DQ		 347 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
348 error = security_inode_notifysecctx(inode, label->label,
349 label->len);
350 if (error)
351 printk(KERN_ERR "%s() %s %d "
352 "security_inode_notifysecctx() %d\n",
353 __func__,
354 (char *)label->label,
355 label->len, error);
fd1defc2 356 nfs_clear_label_invalid(inode);
aa9c2669
DQ		 357 }
358}
359
e058f70b
SD		 360struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
361{
362 struct nfs4_label *label = NULL;
363 int minor_version = server->nfs_client->cl_minorversion;
364
365 if (minor_version < 2)
366 return label;
367
368 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
369 return label;
370
371 label = kzalloc(sizeof(struct nfs4_label), flags);
372 if (label == NULL)
373 return ERR_PTR(-ENOMEM);
374
375 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
376 if (label->label == NULL) {
377 kfree(label);
378 return ERR_PTR(-ENOMEM);
379 }
380 label->len = NFS4_MAXLABELLEN;
381
382 return label;
383}
384EXPORT_SYMBOL_GPL(nfs4_label_alloc);
aa9c2669 385#else
829e57d7 386void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
aa9c2669
DQ		 387 struct nfs4_label *label)
388{
389}
e058f70b 390#endif
aa9c2669 391EXPORT_SYMBOL_GPL(nfs_setsecurity);
e058f70b 392
f174ff7a
PT		 393/* Search for inode identified by fh, fileid and i_mode in inode cache. */
394struct inode *
395nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
396{
397 struct nfs_find_desc desc = {
398 .fh = fh,
399 .fattr = fattr,
400 };
401 struct inode *inode;
402 unsigned long hash;
403
404 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
405 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
406 return NULL;
407
408 hash = nfs_fattr_to_ino_t(fattr);
409 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
410
411 dprintk("%s: returning %p\n", __func__, inode);
412 return inode;
413}
414
1da177e4
LT		 415/*
416 * This is our front-end to iget that looks up inodes by file handle
417 * instead of inode number.
418 */
419struct inode *
1775fd3e 420nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
1da177e4
LT		 421{
422 struct nfs_find_desc desc = {
423 .fh = fh,
424 .fattr = fattr
425 };
03f28e3a 426 struct inode *inode = ERR_PTR(-ENOENT);
1da177e4
LT		 427 unsigned long hash;
428
7ebb9315
BS		 429 nfs_attr_check_mountpoint(sb, fattr);
430
2ef47eb1
AS		 431 if (nfs_attr_use_mounted_on_fileid(fattr))
432 fattr->fileid = fattr->mounted_on_fileid;
433 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
1da177e4 434 goto out_no_inode;
9e6e70f8 435 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
1da177e4 436 goto out_no_inode;
1da177e4
LT		 437
438 hash = nfs_fattr_to_ino_t(fattr);
439
03f28e3a
TM		 440 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
441 if (inode == NULL) {
442 inode = ERR_PTR(-ENOMEM);
1da177e4 443 goto out_no_inode;
03f28e3a 444 }
1da177e4
LT		 445
446 if (inode->i_state & I_NEW) {
447 struct nfs_inode *nfsi = NFS_I(inode);
b0c4fddc 448 unsigned long now = jiffies;
1da177e4
LT		 449
450 /* We set i_ino for the few things that still rely on it,
451 * such as stat(2) */
452 inode->i_ino = hash;
453
454 /* We can't support update_atime(), since the server will reset it */
455 inode->i_flags |= S_NOATIME|S_NOCMTIME;
456 inode->i_mode = fattr->mode;
821a868a 457 nfsi->cache_validity = 0;
62ab460c
TM		 458 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
459 && nfs_server_capable(inode, NFS_CAP_MODE))
16e14375 460 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
1da177e4
LT		 461 /* Why so? Because we want revalidate for devices/FIFOs, and
462 * that's precisely what we have in nfs_file_inode_operations.
463 */
8fa5c000 464 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
1da177e4 465 if (S_ISREG(inode->i_mode)) {
1788ea6e 466 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
1da177e4 467 inode->i_data.a_ops = &nfs_file_aops;
1da177e4 468 } else if (S_ISDIR(inode->i_mode)) {
8fa5c000 469 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
1da177e4 470 inode->i_fop = &nfs_dir_operations;
11de3b11 471 inode->i_data.a_ops = &nfs_dir_aops;
55a97593 472 /* Deal with crossing mountpoints */
7ebb9315
BS		 473 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
474 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
6b97fd3d
MN		 475 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
476 inode->i_op = &nfs_referral_inode_operations;
477 else
478 inode->i_op = &nfs_mountpoint_inode_operations;
55a97593 479 inode->i_fop = NULL;
36d43a43 480 inode->i_flags |= S_AUTOMOUNT;
55a97593 481 }
21fc61c7 482 } else if (S_ISLNK(inode->i_mode)) {
1da177e4 483 inode->i_op = &nfs_symlink_inode_operations;
21fc61c7
AV		 484 inode_nohighmem(inode);
485 } else
1da177e4
LT		 486 init_special_inode(inode, inode->i_mode, fattr->rdev);
487
9e6e70f8
TM		 488 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
489 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
490 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
1eb5d98f 491 inode_set_iversion_raw(inode, 0);
9e6e70f8 492 inode->i_size = 0;
6d6b77f1 493 clear_nlink(inode);
9ff593c4
EB		 494 inode->i_uid = make_kuid(&init_user_ns, -2);
495 inode->i_gid = make_kgid(&init_user_ns, -2);
9e6e70f8
TM		 496 inode->i_blocks = 0;
497 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
2701d086
AA		 498 nfsi->write_io = 0;
499 nfsi->read_io = 0;
9e6e70f8 500
33801147 501 nfsi->read_cache_jiffies = fattr->time_start;
4704f0e2 502 nfsi->attr_gencount = fattr->gencount;
9e6e70f8 503 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
95582b00 504 inode->i_atime = timespec_to_timespec64(fattr->atime);
62ab460c 505 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
16e14375 506 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
9e6e70f8 507 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
95582b00 508 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
62ab460c 509 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
16e14375 510 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
9e6e70f8 511 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
95582b00 512 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
62ab460c 513 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
16e14375 514 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
9e6e70f8 515 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1eb5d98f 516 inode_set_iversion_raw(inode, fattr->change_attr);
cd812599 517 else
16e14375 518 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
9e6e70f8
TM		 519 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
520 inode->i_size = nfs_size_to_loff_t(fattr->size);
62ab460c 521 else
16e14375 522 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
9e6e70f8 523 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
bfe86848 524 set_nlink(inode, fattr->nlink);
62ab460c 525 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
16e14375 526 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 527 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
528 inode->i_uid = fattr->uid;
62ab460c 529 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
16e14375 530 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 531 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
532 inode->i_gid = fattr->gid;
62ab460c 533 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
16e14375 534 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 535 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
536 inode->i_blocks = fattr->du.nfs2.blocks;
537 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 538 /*
539 * report the blocks in 512byte units
540 */
541 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1da177e4 542 }
aa9c2669 543
821a868a
TM		 544 if (nfsi->cache_validity != 0)
545 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
546
aa9c2669
DQ		 547 nfs_setsecurity(inode, fattr, label);
548
1da177e4 549 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
b0c4fddc 550 nfsi->attrtimeo_timestamp = now;
1c3c07e9 551 nfsi->access_cache = RB_ROOT;
1da177e4 552
f1fe29b4 553 nfs_fscache_init_inode(inode);
ef79c097 554
1da177e4 555 unlock_new_inode(inode);
26fde4df
N		 556 } else {
557 int err = nfs_refresh_inode(inode, fattr);
558 if (err < 0) {
559 iput(inode);
560 inode = ERR_PTR(err);
561 goto out_no_inode;
562 }
563 }
1e8968c5 564 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
1da177e4 565 inode->i_sb->s_id,
1e8968c5 566 (unsigned long long)NFS_FILEID(inode),
4f1abd22 567 nfs_display_fhandle_hash(fh),
1da177e4
LT		 568 atomic_read(&inode->i_count));
569
570out:
571 return inode;
572
573out_no_inode:
03f28e3a 574 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
1da177e4
LT		 575 goto out;
576}
89d77c8f 577EXPORT_SYMBOL_GPL(nfs_fhget);
1da177e4 578
536e43d1 579#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		 580
581int
582nfs_setattr(struct dentry *dentry, struct iattr *attr)
583{
2b0143b5 584 struct inode *inode = d_inode(dentry);
987f8dfc 585 struct nfs_fattr *fattr;
ae57ca0f 586 int error = 0;
1da177e4 587
91d5b470
CL		 588 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
589
188b95dd
JL		 590 /* skip mode change if it's just for clearing setuid/setgid */
591 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
592 attr->ia_valid &= ~ATTR_MODE;
593
1da177e4 594 if (attr->ia_valid & ATTR_SIZE) {
08a899d5
CH		 595 BUG_ON(!S_ISREG(inode->i_mode));
596
ae57ca0f
KM		 597 error = inode_newsize_ok(inode, attr->ia_size);
598 if (error)
599 return error;
600
601 if (attr->ia_size == i_size_read(inode))
1da177e4
LT		 602 attr->ia_valid &= ~ATTR_SIZE;
603 }
604
605 /* Optimization: if the end result is no change, don't RPC */
606 attr->ia_valid &= NFS_VALID_ATTRS;
536e43d1 607 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
1da177e4
LT		 608 return 0;
609
f4ce1299
TM		 610 trace_nfs_setattr_enter(inode);
611
755c1e20 612 /* Write all dirty data */
4d346bea
TM		 613 if (S_ISREG(inode->i_mode))
614 nfs_sync_inode(inode);
987f8dfc
TM		 615
616 fattr = nfs_alloc_fattr();
ae57ca0f
KM		 617 if (fattr == NULL) {
618 error = -ENOMEM;
987f8dfc 619 goto out;
ae57ca0f
KM		 620 }
621
987f8dfc 622 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
65e4308d 623 if (error == 0)
aa9c2669 624 error = nfs_refresh_inode(inode, fattr);
987f8dfc
TM		 625 nfs_free_fattr(fattr);
626out:
f4ce1299 627 trace_nfs_setattr_exit(inode, error);
65e4308d
TM		 628 return error;
629}
ddda8e0a 630EXPORT_SYMBOL_GPL(nfs_setattr);
65e4308d 631
a3d01454
TM		 632/**
633 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
634 * @inode: inode of the file used
635 * @offset: file offset to start truncating
636 *
637 * This is a copy of the common vmtruncate, but with the locking
638 * corrected to take into account the fact that NFS requires
639 * inode->i_size to be updated under the inode->i_lock.
f044636d 640 * Note: must be called with inode->i_lock held!
a3d01454
TM		 641 */
642static int nfs_vmtruncate(struct inode * inode, loff_t offset)
643{
c08d3b0e 644 int err;
a3d01454 645
c08d3b0e 646 err = inode_newsize_ok(inode, offset);
647 if (err)
648 goto out;
a3d01454 649
c08d3b0e 650 i_size_write(inode, offset);
6edf9609
TM		 651 /* Optimisation */
652 if (offset == 0)
653 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
f6cdfa6d 654 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
c08d3b0e 655
f044636d 656 spin_unlock(&inode->i_lock);
7caef267 657 truncate_pagecache(inode, offset);
f044636d 658 spin_lock(&inode->i_lock);
c08d3b0e 659out:
660 return err;
a3d01454
TM		 661}
662
65e4308d
TM		 663/**
664 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
665 * @inode: pointer to struct inode
666 * @attr: pointer to struct iattr
16e14375 667 * @fattr: pointer to struct nfs_fattr
65e4308d
TM		 668 *
669 * Note: we do this in the *proc.c in order to ensure that
670 * it works for things like exclusive creates too.
671 */
f044636d
TM		 672void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
673 struct nfs_fattr *fattr)
65e4308d 674{
f044636d
TM		 675 /* Barrier: bump the attribute generation count. */
676 nfs_fattr_set_barrier(fattr);
677
678 spin_lock(&inode->i_lock);
679 NFS_I(inode)->attr_gencount = fattr->gencount;
6a97d02d
TM		 680 if ((attr->ia_valid & ATTR_SIZE) != 0) {
681 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
682 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
683 nfs_vmtruncate(inode, attr->ia_size);
684 }
65e4308d 685 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
6a97d02d 686 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
1da177e4 687 if ((attr->ia_valid & ATTR_MODE) != 0) {
65e4308d
TM		 688 int mode = attr->ia_mode & S_IALLUGO;
689 mode |= inode->i_mode & ~S_IALLUGO;
1da177e4
LT		 690 inode->i_mode = mode;
691 }
692 if ((attr->ia_valid & ATTR_UID) != 0)
693 inode->i_uid = attr->ia_uid;
694 if ((attr->ia_valid & ATTR_GID) != 0)
695 inode->i_gid = attr->ia_gid;
6a97d02d 696 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
15eefe2a 697 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
6a97d02d
TM		 698 else
699 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
700 | NFS_INO_INVALID_CTIME);
6edf9609
TM		 701 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
702 | NFS_INO_INVALID_ACL);
65e4308d 703 }
6a97d02d
TM		 704 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
705 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
706 | NFS_INO_INVALID_CTIME);
707 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
15eefe2a 708 inode->i_atime = timespec_to_timespec64(fattr->atime);
6a97d02d
TM		 709 else if (attr->ia_valid & ATTR_ATIME_SET)
710 inode->i_atime = attr->ia_atime;
711 else
712 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
713
714 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
15eefe2a 715 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
6a97d02d
TM		 716 else
717 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
718 | NFS_INO_INVALID_CTIME);
719 }
720 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
721 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
722 | NFS_INO_INVALID_CTIME);
723 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
15eefe2a 724 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
6a97d02d
TM		 725 else if (attr->ia_valid & ATTR_MTIME_SET)
726 inode->i_mtime = attr->ia_mtime;
727 else
728 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
729
730 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
15eefe2a 731 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
6a97d02d
TM		 732 else
733 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
734 | NFS_INO_INVALID_CTIME);
65e4308d 735 }
616c3196
JL		 736 if (fattr->valid)
737 nfs_update_inode(inode, fattr);
f044636d 738 spin_unlock(&inode->i_lock);
1da177e4 739}
ddda8e0a 740EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
1da177e4 741
1bcf4c5c 742static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
311324ad
TM		 743{
744 struct dentry *parent;
745
1bcf4c5c
TM		 746 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
747 return;
311324ad 748 parent = dget_parent(dentry);
2b0143b5 749 nfs_force_use_readdirplus(d_inode(parent));
311324ad
TM		 750 dput(parent);
751}
752
1bcf4c5c
TM		 753static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
754{
755 struct dentry *parent;
756
757 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
758 return;
759 parent = dget_parent(dentry);
760 nfs_advise_use_readdirplus(d_inode(parent));
761 dput(parent);
762}
763
311324ad
TM		 764static bool nfs_need_revalidate_inode(struct inode *inode)
765{
766 if (NFS_I(inode)->cache_validity &
767 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
768 return true;
769 if (nfs_attribute_cache_expired(inode))
770 return true;
771 return false;
772}
773
a528d35e
DH		 774int nfs_getattr(const struct path *path, struct kstat *stat,
775 u32 request_mask, unsigned int query_flags)
1da177e4 776{
a528d35e 777 struct inode *inode = d_inode(path->dentry);
9ccee940
TM		 778 struct nfs_server *server = NFS_SERVER(inode);
779 unsigned long cache_validity;
16caf5b6 780 int err = 0;
9ccee940
TM		 781 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
782 bool do_update = false;
1da177e4 783
f4ce1299 784 trace_nfs_getattr_enter(inode);
9ccee940
TM		 785
786 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync)
787 goto out_no_update;
788
acdc53b2 789 /* Flush out writes to the server in order to update c/mtime. */
9ccee940
TM		 790 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
791 S_ISREG(inode->i_mode)) {
79566ef0 792 err = filemap_write_and_wait(inode->i_mapping);
acdc53b2
TM		 793 if (err)
794 goto out;
28c494c5 795 }
fc33a7bb
CH		 796
797 /*
798 * We may force a getattr if the user cares about atime.
799 *
800 * Note that we only have to check the vfsmount flags here:
801 * - NFS always sets S_NOATIME by so checking it would give a
802 * bogus result
1751e8a6 803 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
fc33a7bb
CH		 804 * no point in checking those.
805 */
a528d35e
DH		 806 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
807 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
9ccee940
TM		 808 request_mask &= ~STATX_ATIME;
809
810 /* Is the user requesting attributes that might need revalidation? */
811 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
812 STATX_MTIME|STATX_UID|STATX_GID|
813 STATX_SIZE|STATX_BLOCKS)))
814 goto out_no_revalidate;
815
816 /* Check whether the cached attributes are stale */
817 do_update |= force_sync || nfs_attribute_cache_expired(inode);
818 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
819 do_update |= cache_validity &
820 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
821 if (request_mask & STATX_ATIME)
822 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
823 if (request_mask & (STATX_CTIME|STATX_MTIME))
824 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
825 if (do_update) {
826 /* Update the attribute cache */
59b86d85
HT		 827 if (!(server->flags & NFS_MOUNT_NOAC))
828 nfs_readdirplus_parent_cache_miss(path->dentry);
829 else
830 nfs_readdirplus_parent_cache_hit(path->dentry);
311324ad 831 err = __nfs_revalidate_inode(server, inode);
9ccee940
TM		 832 if (err)
833 goto out;
1bcf4c5c 834 } else
a528d35e 835 nfs_readdirplus_parent_cache_hit(path->dentry);
9ccee940
TM		 836out_no_revalidate:
837 /* Only return attributes that were revalidated. */
838 stat->result_mask &= request_mask;
839out_no_update:
840 generic_fillattr(inode, stat);
841 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
842 if (S_ISDIR(inode->i_mode))
843 stat->blksize = NFS_SERVER(inode)->dtsize;
acdc53b2 844out:
f4ce1299 845 trace_nfs_getattr_exit(inode, err);
1da177e4
LT		 846 return err;
847}
ddda8e0a 848EXPORT_SYMBOL_GPL(nfs_getattr);
1da177e4 849
f11ac8db
TM		 850static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
851{
2f62b5aa 852 refcount_set(&l_ctx->count, 1);
d51fdb87 853 l_ctx->lockowner = current->files;
f11ac8db 854 INIT_LIST_HEAD(&l_ctx->list);
210c7c17 855 atomic_set(&l_ctx->io_count, 0);
f11ac8db
TM		 856}
857
858static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
859{
8c86899f
TM		 860 struct nfs_lock_context *head = &ctx->lock_context;
861 struct nfs_lock_context *pos = head;
f11ac8db 862
8c86899f 863 do {
d51fdb87 864 if (pos->lockowner != current->files)
f11ac8db 865 continue;
2f62b5aa 866 refcount_inc(&pos->count);
f11ac8db 867 return pos;
8c86899f 868 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
f11ac8db
TM		 869 return NULL;
870}
871
872struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
873{
874 struct nfs_lock_context *res, *new = NULL;
2b0143b5 875 struct inode *inode = d_inode(ctx->dentry);
f11ac8db
TM		 876
877 spin_lock(&inode->i_lock);
878 res = __nfs_find_lock_context(ctx);
879 if (res == NULL) {
880 spin_unlock(&inode->i_lock);
881 new = kmalloc(sizeof(*new), GFP_KERNEL);
882 if (new == NULL)
b3c54de6 883 return ERR_PTR(-ENOMEM);
f11ac8db
TM		 884 nfs_init_lock_context(new);
885 spin_lock(&inode->i_lock);
886 res = __nfs_find_lock_context(ctx);
887 if (res == NULL) {
888 list_add_tail(&new->list, &ctx->lock_context.list);
889 new->open_context = ctx;
890 res = new;
891 new = NULL;
892 }
893 }
894 spin_unlock(&inode->i_lock);
895 kfree(new);
896 return res;
897}
1c6dcbe5 898EXPORT_SYMBOL_GPL(nfs_get_lock_context);
f11ac8db
TM		 899
900void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
901{
902 struct nfs_open_context *ctx = l_ctx->open_context;
2b0143b5 903 struct inode *inode = d_inode(ctx->dentry);
f11ac8db 904
2f62b5aa 905 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
f11ac8db
TM		 906 return;
907 list_del(&l_ctx->list);
908 spin_unlock(&inode->i_lock);
909 kfree(l_ctx);
910}
1c6dcbe5 911EXPORT_SYMBOL_GPL(nfs_put_lock_context);
f11ac8db 912
7fe5c398
TM		 913/**
914 * nfs_close_context - Common close_context() routine NFSv2/v3
915 * @ctx: pointer to context
916 * @is_sync: is this a synchronous close
917 *
5cf9d706
TM		 918 * Ensure that the attributes are up to date if we're mounted
919 * with close-to-open semantics and we have cached data that will
920 * need to be revalidated on open.
7fe5c398
TM		 921 */
922void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
923{
5cf9d706 924 struct nfs_inode *nfsi;
7fe5c398
TM		 925 struct inode *inode;
926 struct nfs_server *server;
927
928 if (!(ctx->mode & FMODE_WRITE))
929 return;
930 if (!is_sync)
931 return;
2b0143b5 932 inode = d_inode(ctx->dentry);
58ff4184
TM		 933 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
934 return;
5cf9d706
TM		 935 nfsi = NFS_I(inode);
936 if (inode->i_mapping->nrpages == 0)
937 return;
938 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
939 return;
940 if (!list_empty(&nfsi->open_files))
7fe5c398
TM		 941 return;
942 server = NFS_SERVER(inode);
943 if (server->flags & NFS_MOUNT_NOCTO)
944 return;
945 nfs_revalidate_inode(server, inode);
946}
ddda8e0a 947EXPORT_SYMBOL_GPL(nfs_close_context);
7fe5c398 948
532d4def
N		 949struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
950 fmode_t f_mode,
951 struct file *filp)
1da177e4
LT		 952{
953 struct nfs_open_context *ctx;
5ede7b1c
AV		 954 struct rpc_cred *cred = rpc_lookup_cred();
955 if (IS_ERR(cred))
956 return ERR_CAST(cred);
1da177e4 957
f52720ca 958 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
5ede7b1c
AV		 959 if (!ctx) {
960 put_rpccred(cred);
961 return ERR_PTR(-ENOMEM);
1da177e4 962 }
5ede7b1c
AV		 963 nfs_sb_active(dentry->d_sb);
964 ctx->dentry = dget(dentry);
965 ctx->cred = cred;
966 ctx->state = NULL;
967 ctx->mode = f_mode;
968 ctx->flags = 0;
969 ctx->error = 0;
532d4def 970 ctx->flock_owner = (fl_owner_t)filp;
5ede7b1c
AV		 971 nfs_init_lock_context(&ctx->lock_context);
972 ctx->lock_context.open_context = ctx;
973 INIT_LIST_HEAD(&ctx->list);
82be417a 974 ctx->mdsthreshold = NULL;
1da177e4
LT		 975 return ctx;
976}
89d77c8f 977EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1da177e4
LT		 978
979struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
980{
981 if (ctx != NULL)
2f62b5aa 982 refcount_inc(&ctx->lock_context.count);
1da177e4
LT		 983 return ctx;
984}
89d77c8f 985EXPORT_SYMBOL_GPL(get_nfs_open_context);
1da177e4 986
7fe5c398 987static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1da177e4 988{
2b0143b5 989 struct inode *inode = d_inode(ctx->dentry);
3d4ff43d 990 struct super_block *sb = ctx->dentry->d_sb;
3bec63db 991
5c78f58e 992 if (!list_empty(&ctx->list)) {
2f62b5aa 993 if (!refcount_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
ef84303e
BH		 994 return;
995 list_del(&ctx->list);
996 spin_unlock(&inode->i_lock);
2f62b5aa 997 } else if (!refcount_dec_and_test(&ctx->lock_context.count))
5e11934d 998 return;
5c78f58e
TM		 999 if (inode != NULL)
1000 NFS_PROTO(inode)->close_context(ctx, is_sync);
3bec63db
TM		 1001 if (ctx->cred != NULL)
1002 put_rpccred(ctx->cred);
3d4ff43d 1003 dput(ctx->dentry);
322b2b90 1004 nfs_sb_deactive(sb);
82be417a 1005 kfree(ctx->mdsthreshold);
3bec63db
TM		 1006 kfree(ctx);
1007}
1008
a49c3c77
TM		 1009void put_nfs_open_context(struct nfs_open_context *ctx)
1010{
1011 __put_nfs_open_context(ctx, 0);
1012}
89d77c8f 1013EXPORT_SYMBOL_GPL(put_nfs_open_context);
a49c3c77 1014
4eae5014
TM		 1015static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1016{
1017 __put_nfs_open_context(ctx, 1);
1018}
1019
1da177e4
LT		 1020/*
1021 * Ensure that mmap has a recent RPC credential for use when writing out
1022 * shared pages
1023 */
c45ffdd2 1024void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1da177e4 1025{
2b0143b5 1026 struct inode *inode = d_inode(ctx->dentry);
1da177e4
LT		 1027 struct nfs_inode *nfsi = NFS_I(inode);
1028
1da177e4 1029 spin_lock(&inode->i_lock);
ca0daa27
TM		 1030 if (ctx->mode & FMODE_WRITE)
1031 list_add(&ctx->list, &nfsi->open_files);
1032 else
1033 list_add_tail(&ctx->list, &nfsi->open_files);
1da177e4
LT		 1034 spin_unlock(&inode->i_lock);
1035}
c45ffdd2
TM		 1036EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1037
1038void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1039{
1040 filp->private_data = get_nfs_open_context(ctx);
1041 if (list_empty(&ctx->list))
1042 nfs_inode_attach_open_context(ctx);
1043}
89d77c8f 1044EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1da177e4 1045
d530838b
TM		 1046/*
1047 * Given an inode, search for an open context with the desired characteristics
1048 */
dc0b027d 1049struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
1da177e4
LT		 1050{
1051 struct nfs_inode *nfsi = NFS_I(inode);
1052 struct nfs_open_context *pos, *ctx = NULL;
1053
1054 spin_lock(&inode->i_lock);
1055 list_for_each_entry(pos, &nfsi->open_files, list) {
d530838b
TM		 1056 if (cred != NULL && pos->cred != cred)
1057 continue;
1544fa0f
TM		 1058 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1059 continue;
1060 ctx = get_nfs_open_context(pos);
1061 break;
1da177e4
LT		 1062 }
1063 spin_unlock(&inode->i_lock);
1064 return ctx;
1065}
1066
aff8d8dc 1067void nfs_file_clear_open_context(struct file *filp)
1da177e4 1068{
cd3758e3 1069 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1da177e4
LT		 1070
1071 if (ctx) {
2b0143b5 1072 struct inode *inode = d_inode(ctx->dentry);
c45ffdd2 1073
0bcbf039
PT		 1074 /*
1075 * We fatal error on write before. Try to writeback
1076 * every page again.
1077 */
1078 if (ctx->error < 0)
1079 invalidate_inode_pages2(inode->i_mapping);
1da177e4
LT		 1080 filp->private_data = NULL;
1081 spin_lock(&inode->i_lock);
1082 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
1083 spin_unlock(&inode->i_lock);
4eae5014 1084 put_nfs_open_context_sync(ctx);
1da177e4
LT		 1085 }
1086}
1087
1088/*
1089 * These allocate and release file read/write context information.
1090 */
1091int nfs_open(struct inode *inode, struct file *filp)
1092{
1093 struct nfs_open_context *ctx;
1da177e4 1094
532d4def 1095 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
5ede7b1c
AV		 1096 if (IS_ERR(ctx))
1097 return PTR_ERR(ctx);
1da177e4
LT		 1098 nfs_file_set_open_context(filp, ctx);
1099 put_nfs_open_context(ctx);
f1fe29b4 1100 nfs_fscache_open_file(inode, filp);
1da177e4
LT		 1101 return 0;
1102}
1103
1da177e4
LT		 1104/*
1105 * This function is called whenever some part of NFS notices that
1106 * the cached attributes have to be refreshed.
1107 */
1108int
1109__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1110{
1111 int status = -ESTALE;
1775fd3e 1112 struct nfs4_label *label = NULL;
a3cba2aa 1113 struct nfs_fattr *fattr = NULL;
1da177e4 1114 struct nfs_inode *nfsi = NFS_I(inode);
1da177e4 1115
1e8968c5
NV		 1116 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1117 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1da177e4 1118
f4ce1299
TM		 1119 trace_nfs_revalidate_inode_enter(inode);
1120
85233a7a 1121 if (is_bad_inode(inode))
691beb13 1122 goto out;
1da177e4 1123 if (NFS_STALE(inode))
412d582e 1124 goto out;
7fdc49c4 1125
ac46bd37
TM		 1126 /* pNFS: Attributes aren't updated until we layoutcommit */
1127 if (S_ISREG(inode->i_mode)) {
1128 status = pnfs_sync_inode(inode, false);
1129 if (status)
1130 goto out;
1131 }
1132
a3cba2aa
TM		 1133 status = -ENOMEM;
1134 fattr = nfs_alloc_fattr();
1135 if (fattr == NULL)
1136 goto out;
1137
691beb13 1138 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
14c43f76
DQ		 1139
1140 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1141 if (IS_ERR(label)) {
1142 status = PTR_ERR(label);
1143 goto out;
1144 }
1145
a841b54d
TM		 1146 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1147 label, inode);
1da177e4 1148 if (status != 0) {
1e8968c5 1149 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1da177e4 1150 inode->i_sb->s_id,
1e8968c5 1151 (unsigned long long)NFS_FILEID(inode), status);
1da177e4
LT		 1152 if (status == -ESTALE) {
1153 nfs_zap_caches(inode);
1154 if (!S_ISDIR(inode->i_mode))
3a10c30a 1155 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1da177e4 1156 }
14c43f76 1157 goto err_out;
1da177e4
LT		 1158 }
1159
a3cba2aa 1160 status = nfs_refresh_inode(inode, fattr);
1da177e4 1161 if (status) {
1e8968c5 1162 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1da177e4 1163 inode->i_sb->s_id,
1e8968c5 1164 (unsigned long long)NFS_FILEID(inode), status);
14c43f76 1165 goto err_out;
1da177e4 1166 }
55296809 1167
24aa1fe6 1168 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
ada70d94 1169 nfs_zap_acl_cache(inode);
55296809 1170
3da580aa
JL		 1171 nfs_setsecurity(inode, fattr, label);
1172
1e8968c5 1173 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1da177e4 1174 inode->i_sb->s_id,
1e8968c5 1175 (unsigned long long)NFS_FILEID(inode));
1da177e4 1176
14c43f76
DQ		 1177err_out:
1178 nfs4_label_free(label);
1179out:
a3cba2aa 1180 nfs_free_fattr(fattr);
f4ce1299 1181 trace_nfs_revalidate_inode_exit(inode, status);
1da177e4
LT		 1182 return status;
1183}
1184
43f291cd 1185int nfs_attribute_cache_expired(struct inode *inode)
d7cf8dd0 1186{
b4d2314b 1187 if (nfs_have_delegated_attributes(inode))
1da177e4 1188 return 0;
d7cf8dd0 1189 return nfs_attribute_timeout(inode);
1da177e4
LT		 1190}
1191
1192/**
1193 * nfs_revalidate_inode - Revalidate the inode attributes
1194 * @server - pointer to nfs_server struct
1195 * @inode - pointer to inode struct
1196 *
1197 * Updates inode attribute information by retrieving the data from the server.
1198 */
1199int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1200{
311324ad 1201 if (!nfs_need_revalidate_inode(inode))
1da177e4
LT		 1202 return NFS_STALE(inode) ? -ESTALE : 0;
1203 return __nfs_revalidate_inode(server, inode);
1204}
1c606fb7 1205EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1da177e4 1206
1cda707d 1207static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
717d44e8
TM		 1208{
1209 struct nfs_inode *nfsi = NFS_I(inode);
f8806c84
TM		 1210 int ret;
1211
717d44e8 1212 if (mapping->nrpages != 0) {
f8806c84
TM		 1213 if (S_ISREG(inode->i_mode)) {
1214 ret = nfs_sync_mapping(mapping);
1215 if (ret < 0)
1216 return ret;
1217 }
1218 ret = invalidate_inode_pages2(mapping);
717d44e8
TM		 1219 if (ret < 0)
1220 return ret;
1221 }
d529ef83
JL		 1222 if (S_ISDIR(inode->i_mode)) {
1223 spin_lock(&inode->i_lock);
717d44e8 1224 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
d529ef83
JL		 1225 spin_unlock(&inode->i_lock);
1226 }
717d44e8 1227 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
de242c0b 1228 nfs_fscache_wait_on_invalidate(inode);
f4ce1299 1229
1e8968c5
NV		 1230 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1231 inode->i_sb->s_id,
1232 (unsigned long long)NFS_FILEID(inode));
717d44e8
TM		 1233 return 0;
1234}
1235
1cd9cb05 1236bool nfs_mapping_need_revalidate_inode(struct inode *inode)
b4b1eadf 1237{
61540bf6
TM		 1238 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1239 NFS_STALE(inode);
b4b1eadf
TM		 1240}
1241
0d0def49
AV		 1242int nfs_revalidate_mapping_rcu(struct inode *inode)
1243{
1244 struct nfs_inode *nfsi = NFS_I(inode);
1245 unsigned long *bitlock = &nfsi->flags;
1246 int ret = 0;
1247
1248 if (IS_SWAPFILE(inode))
1249 goto out;
1250 if (nfs_mapping_need_revalidate_inode(inode)) {
1251 ret = -ECHILD;
1252 goto out;
1253 }
1254 spin_lock(&inode->i_lock);
1255 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1256 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1257 ret = -ECHILD;
1258 spin_unlock(&inode->i_lock);
1259out:
1260 return ret;
1261}
1262
717d44e8 1263/**
be527494 1264 * nfs_revalidate_mapping - Revalidate the pagecache
717d44e8
TM		 1265 * @inode - pointer to host inode
1266 * @mapping - pointer to mapping
717d44e8 1267 */
be527494
TM		 1268int nfs_revalidate_mapping(struct inode *inode,
1269 struct address_space *mapping)
717d44e8
TM		 1270{
1271 struct nfs_inode *nfsi = NFS_I(inode);
d529ef83 1272 unsigned long *bitlock = &nfsi->flags;
717d44e8 1273 int ret = 0;
dc59250c 1274
29418aa4
MG		 1275 /* swapfiles are not supposed to be shared. */
1276 if (IS_SWAPFILE(inode))
1277 goto out;
1278
b4b1eadf 1279 if (nfs_mapping_need_revalidate_inode(inode)) {
717d44e8
TM		 1280 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1281 if (ret < 0)
1282 goto out;
7d52e862 1283 }
d529ef83
JL		 1284
1285 /*
1286 * We must clear NFS_INO_INVALID_DATA first to ensure that
1287 * invalidations that come in while we're shooting down the mappings
1288 * are respected. But, that leaves a race window where one revalidator
1289 * can clear the flag, and then another checks it before the mapping
1290 * gets invalidated. Fix that by serializing access to this part of
1291 * the function.
1292 *
1293 * At the same time, we need to allow other tasks to see whether we
1294 * might be in the middle of invalidating the pages, so we only set
1295 * the bit lock here if it looks like we're going to be doing that.
1296 */
1297 for (;;) {
74316201
N		 1298 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1299 nfs_wait_bit_killable, TASK_KILLABLE);
d529ef83
JL		 1300 if (ret)
1301 goto out;
17dfeb91
TM		 1302 spin_lock(&inode->i_lock);
1303 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1304 spin_unlock(&inode->i_lock);
1305 continue;
1306 }
1307 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
d529ef83 1308 break;
d529ef83 1309 spin_unlock(&inode->i_lock);
17dfeb91 1310 goto out;
f4ce1299
TM		 1311 }
1312
17dfeb91 1313 set_bit(NFS_INO_INVALIDATING, bitlock);
4db72b40 1314 smp_wmb();
17dfeb91
TM		 1315 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1316 spin_unlock(&inode->i_lock);
1317 trace_nfs_invalidate_mapping_enter(inode);
be527494 1318 ret = nfs_invalidate_mapping(inode, mapping);
17dfeb91
TM		 1319 trace_nfs_invalidate_mapping_exit(inode, ret);
1320
d529ef83 1321 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
4e857c58 1322 smp_mb__after_atomic();
d529ef83 1323 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
cd9ae2b6 1324out:
44b11874 1325 return ret;
7d52e862
TM		 1326}
1327
ca0daa27 1328static bool nfs_file_has_writers(struct nfs_inode *nfsi)
874f9463 1329{
ca0daa27
TM		 1330 struct inode *inode = &nfsi->vfs_inode;
1331
1332 assert_spin_locked(&inode->i_lock);
1333
1334 if (!S_ISREG(inode->i_mode))
1335 return false;
1336 if (list_empty(&nfsi->open_files))
1337 return false;
1338 /* Note: This relies on nfsi->open_files being ordered with writers
1339 * being placed at the head of the list.
1340 * See nfs_inode_attach_open_context()
1341 */
1342 return (list_first_entry(&nfsi->open_files,
1343 struct nfs_open_context,
1344 list)->mode & FMODE_WRITE) == FMODE_WRITE;
874f9463
TM		 1345}
1346
651b0e70 1347static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
874f9463 1348{
651b0e70 1349 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
874f9463
TM		 1350}
1351
783b194c 1352static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
a895b4a1 1353{
95582b00
DD		 1354 struct timespec ts;
1355
9e6e70f8
TM		 1356 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1357 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
c472c07b 1358 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1eb5d98f 1359 inode_set_iversion_raw(inode, fattr->change_attr);
70ca8852 1360 if (S_ISDIR(inode->i_mode))
6edf9609 1361 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
70ca8852 1362 }
a895b4a1 1363 /* If we have atomic WCC data, we may update some attributes */
95582b00 1364 ts = timespec64_to_timespec(inode->i_ctime);
9e6e70f8
TM		 1365 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1366 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
95582b00
DD		 1367 && timespec_equal(&ts, &fattr->pre_ctime)) {
1368 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
27dc1cd3 1369 }
9e6e70f8 1370
95582b00 1371 ts = timespec64_to_timespec(inode->i_mtime);
9e6e70f8
TM		 1372 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1373 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
95582b00
DD		 1374 && timespec_equal(&ts, &fattr->pre_mtime)) {
1375 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
27dc1cd3 1376 if (S_ISDIR(inode->i_mode))
6edf9609 1377 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
a895b4a1 1378 }
9e6e70f8
TM		 1379 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1380 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1381 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
a6b6d5b8 1382 && !nfs_have_writebacks(inode)) {
27dc1cd3 1383 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
27dc1cd3 1384 }
a895b4a1
TM		 1385}
1386
1da177e4 1387/**
33801147 1388 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1da177e4
LT		 1389 * @inode - pointer to inode
1390 * @fattr - updated attributes
1391 *
1392 * Verifies the attribute cache. If we have just changed the attributes,
1393 * so that fattr carries weak cache consistency data, then it may
1394 * also update the ctime/mtime/change_attribute.
1395 */
33801147 1396static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1da177e4
LT		 1397{
1398 struct nfs_inode *nfsi = NFS_I(inode);
1399 loff_t cur_size, new_isize;
2a3f5fd4 1400 unsigned long invalid = 0;
95582b00 1401 struct timespec ts;
dc59250c 1402
4ebe83af 1403 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
01da47bd 1404 return 0;
4ebe83af 1405
ca62b9c3 1406 /* Has the inode gone and changed behind our back? */
9e6e70f8 1407 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
cc89684c 1408 return -ESTALE;
9e6e70f8 1409 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
cc89684c 1410 return -ESTALE;
ca62b9c3 1411
651b0e70 1412 if (!nfs_file_has_buffered_writers(nfsi)) {
ca0daa27 1413 /* Verify a few of the more important attributes */
c472c07b 1414 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
16e14375
TM		 1415 invalid |= NFS_INO_INVALID_CHANGE
1416 | NFS_INO_REVAL_PAGECACHE;
1da177e4 1417
95582b00
DD		 1418 ts = timespec64_to_timespec(inode->i_mtime);
1419 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&ts, &fattr->mtime))
16e14375 1420 invalid |= NFS_INO_INVALID_MTIME;
ca62b9c3 1421
95582b00
DD		 1422 ts = timespec64_to_timespec(inode->i_ctime);
1423 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&ts, &fattr->ctime))
16e14375 1424 invalid |= NFS_INO_INVALID_CTIME;
ca0daa27
TM		 1425
1426 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1427 cur_size = i_size_read(inode);
1428 new_isize = nfs_size_to_loff_t(fattr->size);
1429 if (cur_size != new_isize)
16e14375
TM		 1430 invalid |= NFS_INO_INVALID_SIZE
1431 | NFS_INO_REVAL_PAGECACHE;
ca0daa27 1432 }
9e6e70f8 1433 }
1da177e4
LT		 1434
1435 /* Have any file permissions changed? */
9e6e70f8 1436 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
16e14375
TM		 1437 invalid |= NFS_INO_INVALID_ACCESS
1438 | NFS_INO_INVALID_ACL
1439 | NFS_INO_INVALID_OTHER;
9ff593c4 1440 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
16e14375
TM		 1441 invalid |= NFS_INO_INVALID_ACCESS
1442 | NFS_INO_INVALID_ACL
1443 | NFS_INO_INVALID_OTHER;
9ff593c4 1444 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
16e14375
TM		 1445 invalid |= NFS_INO_INVALID_ACCESS
1446 | NFS_INO_INVALID_ACL
1447 | NFS_INO_INVALID_OTHER;
1da177e4
LT		 1448
1449 /* Has the link count changed? */
9e6e70f8 1450 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
16e14375 1451 invalid |= NFS_INO_INVALID_OTHER;
1da177e4 1452
95582b00
DD		 1453 ts = timespec64_to_timespec(inode->i_atime);
1454 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&ts, &fattr->atime))
2a3f5fd4
TM		 1455 invalid |= NFS_INO_INVALID_ATIME;
1456
1457 if (invalid != 0)
4ebe83af 1458 nfs_set_cache_invalid(inode, invalid);
1da177e4 1459
33801147 1460 nfsi->read_cache_jiffies = fattr->time_start;
1da177e4
LT		 1461 return 0;
1462}
1463
ae05f269 1464static atomic_long_t nfs_attr_generation_counter;
4704f0e2
TM		 1465
1466static unsigned long nfs_read_attr_generation_counter(void)
1467{
ae05f269 1468 return atomic_long_read(&nfs_attr_generation_counter);
4704f0e2
TM		 1469}
1470
1471unsigned long nfs_inc_attr_generation_counter(void)
1472{
ae05f269 1473 return atomic_long_inc_return(&nfs_attr_generation_counter);
4704f0e2 1474}
3235b403 1475EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
4704f0e2
TM		 1476
1477void nfs_fattr_init(struct nfs_fattr *fattr)
1478{
1479 fattr->valid = 0;
1480 fattr->time_start = jiffies;
1481 fattr->gencount = nfs_inc_attr_generation_counter();
6926afd1
TM		 1482 fattr->owner_name = NULL;
1483 fattr->group_name = NULL;
4704f0e2 1484}
ddda8e0a 1485EXPORT_SYMBOL_GPL(nfs_fattr_init);
4704f0e2 1486
140e049c
TM		 1487/**
1488 * nfs_fattr_set_barrier
1489 * @fattr: attributes
1490 *
1491 * Used to set a barrier after an attribute was updated. This
1492 * barrier ensures that older attributes from RPC calls that may
1493 * have raced with our update cannot clobber these new values.
1494 * Note that you are still responsible for ensuring that other
1495 * operations which change the attribute on the server do not
1496 * collide.
1497 */
1498void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1499{
1500 fattr->gencount = nfs_inc_attr_generation_counter();
1501}
1502
2d36bfde
TM		 1503struct nfs_fattr *nfs_alloc_fattr(void)
1504{
1505 struct nfs_fattr *fattr;
1506
1507 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1508 if (fattr != NULL)
1509 nfs_fattr_init(fattr);
1510 return fattr;
1511}
ddda8e0a 1512EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
2d36bfde
TM		 1513
1514struct nfs_fh *nfs_alloc_fhandle(void)
1515{
1516 struct nfs_fh *fh;
1517
1518 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1519 if (fh != NULL)
1520 fh->size = 0;
1521 return fh;
1522}
ddda8e0a 1523EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
2d36bfde 1524
e27d359e 1525#ifdef NFS_DEBUG
d8e0539e
WAA		 1526/*
1527 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1528 * in the same way that wireshark does
1529 *
1530 * @fh: file handle
1531 *
1532 * For debugging only.
1533 */
1534u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1535{
1536 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1537 * not on the result */
1264a2f0 1538 return nfs_fhandle_hash(fh);
d8e0539e 1539}
9e6ee76d 1540EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
d8e0539e
WAA		 1541
1542/*
20d27e92
CL		 1543 * _nfs_display_fhandle - display an NFS file handle on the console
1544 *
1545 * @fh: file handle to display
1546 * @caption: display caption
1547 *
1548 * For debugging only.
1549 */
20d27e92
CL		 1550void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1551{
1552 unsigned short i;
1553
fa68a1ba 1554 if (fh == NULL || fh->size == 0) {
20d27e92
CL		 1555 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1556 return;
1557 }
1558
d8e0539e
WAA		 1559 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1560 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
20d27e92
CL		 1561 for (i = 0; i < fh->size; i += 16) {
1562 __be32 *pos = (__be32 *)&fh->data[i];
1563
1564 switch ((fh->size - i - 1) >> 2) {
1565 case 0:
1566 printk(KERN_DEFAULT " %08x\n",
1567 be32_to_cpup(pos));
1568 break;
1569 case 1:
1570 printk(KERN_DEFAULT " %08x %08x\n",
1571 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1572 break;
1573 case 2:
1574 printk(KERN_DEFAULT " %08x %08x %08x\n",
1575 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1576 be32_to_cpup(pos + 2));
1577 break;
1578 default:
1579 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1580 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1581 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1582 }
1583 }
1584}
9e6ee76d 1585EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
20d27e92
CL		 1586#endif
1587
a10ad176
TM		 1588/**
1589 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1590 * @inode - pointer to inode
1591 * @fattr - attributes
1592 *
1593 * Attempt to divine whether or not an RPC call reply carrying stale
1594 * attributes got scheduled after another call carrying updated ones.
1595 *
1596 * To do so, the function first assumes that a more recent ctime means
1597 * that the attributes in fattr are newer, however it also attempt to
1598 * catch the case where ctime either didn't change, or went backwards
1599 * (if someone reset the clock on the server) by looking at whether
1600 * or not this RPC call was started after the inode was last updated.
4704f0e2 1601 * Note also the check for wraparound of 'attr_gencount'
a10ad176
TM		 1602 *
1603 * The function returns 'true' if it thinks the attributes in 'fattr' are
1604 * more recent than the ones cached in the inode.
1605 *
1606 */
1607static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1608{
1609 const struct nfs_inode *nfsi = NFS_I(inode);
1610
4704f0e2 1611 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
4704f0e2 1612 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
a10ad176
TM		 1613}
1614
1615static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1616{
f4ce1299
TM		 1617 int ret;
1618
1619 trace_nfs_refresh_inode_enter(inode);
1620
a10ad176 1621 if (nfs_inode_attrs_need_update(inode, fattr))
f4ce1299
TM		 1622 ret = nfs_update_inode(inode, fattr);
1623 else
1624 ret = nfs_check_inode_attributes(inode, fattr);
1625
1626 trace_nfs_refresh_inode_exit(inode, ret);
1627 return ret;
870a5be8
TM		 1628}
1629
33801147
TM		 1630/**
1631 * nfs_refresh_inode - try to update the inode attribute cache
1632 * @inode - pointer to inode
1633 * @fattr - updated attributes
1634 *
1635 * Check that an RPC call that returned attributes has not overlapped with
1636 * other recent updates of the inode metadata, then decide whether it is
1637 * safe to do a full update of the inode attributes, or whether just to
1638 * call nfs_check_inode_attributes.
1639 */
1640int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1641{
33801147
TM		 1642 int status;
1643
1644 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1645 return 0;
1646 spin_lock(&inode->i_lock);
870a5be8 1647 status = nfs_refresh_inode_locked(inode, fattr);
33801147 1648 spin_unlock(&inode->i_lock);
ef79c097 1649
33801147
TM		 1650 return status;
1651}
ddda8e0a 1652EXPORT_SYMBOL_GPL(nfs_refresh_inode);
33801147 1653
16e14375
TM		 1654static int nfs_post_op_update_inode_locked(struct inode *inode,
1655 struct nfs_fattr *fattr, unsigned int invalid)
d65f557f 1656{
6edf9609
TM		 1657 if (S_ISDIR(inode->i_mode))
1658 invalid |= NFS_INO_INVALID_DATA;
1659 nfs_set_cache_invalid(inode, invalid);
d65f557f
TM		 1660 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1661 return 0;
1662 return nfs_refresh_inode_locked(inode, fattr);
1663}
1664
decf491f
TM		 1665/**
1666 * nfs_post_op_update_inode - try to update the inode attribute cache
1667 * @inode - pointer to inode
1668 * @fattr - updated attributes
1669 *
1670 * After an operation that has changed the inode metadata, mark the
1671 * attribute cache as being invalid, then try to update it.
f551e44f
CL		 1672 *
1673 * NB: if the server didn't return any post op attributes, this
1674 * function will force the retrieval of attributes before the next
1675 * NFS request. Thus it should be used only for operations that
1676 * are expected to change one or more attributes, to avoid
1677 * unnecessary NFS requests and trips through nfs_update_inode().
decf491f
TM		 1678 */
1679int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1680{
d65f557f 1681 int status;
decf491f 1682
7668fdbe 1683 spin_lock(&inode->i_lock);
92d64e47 1684 nfs_fattr_set_barrier(fattr);
16e14375
TM		 1685 status = nfs_post_op_update_inode_locked(inode, fattr,
1686 NFS_INO_INVALID_CHANGE
d554168f
TM		 1687 | NFS_INO_INVALID_CTIME
1688 | NFS_INO_REVAL_FORCED);
7668fdbe 1689 spin_unlock(&inode->i_lock);
aa9c2669 1690
870a5be8 1691 return status;
decf491f 1692}
1c606fb7 1693EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
decf491f 1694
70ca8852 1695/**
a08a8cd3 1696 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
70ca8852
TM		 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 */
a08a8cd3 1706int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
70ca8852 1707{
d65f557f
TM		 1708 int status;
1709
d65f557f
TM		 1710 /* Don't do a WCC update if these attributes are already stale */
1711 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1712 !nfs_inode_attrs_need_update(inode, fattr)) {
9e6e70f8
TM		 1713 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1714 | NFS_ATTR_FATTR_PRESIZE
1715 | NFS_ATTR_FATTR_PREMTIME
1716 | NFS_ATTR_FATTR_PRECTIME);
d65f557f
TM		 1717 goto out_noforce;
1718 }
9e6e70f8
TM		 1719 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1720 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1eb5d98f 1721 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
9e6e70f8 1722 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
70ca8852 1723 }
9e6e70f8
TM		 1724 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1725 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
95582b00 1726 fattr->pre_ctime = timespec64_to_timespec(inode->i_ctime);
9e6e70f8
TM		 1727 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1728 }
1729 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1730 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
95582b00 1731 fattr->pre_mtime = timespec64_to_timespec(inode->i_mtime);
9e6e70f8
TM		 1732 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1733 }
1734 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1735 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
a3d01454 1736 fattr->pre_size = i_size_read(inode);
9e6e70f8 1737 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
70ca8852 1738 }
d65f557f 1739out_noforce:
16e14375
TM		 1740 status = nfs_post_op_update_inode_locked(inode, fattr,
1741 NFS_INO_INVALID_CHANGE
1742 | NFS_INO_INVALID_CTIME
1743 | NFS_INO_INVALID_MTIME);
a08a8cd3
TM		 1744 return status;
1745}
1746
1747/**
1748 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1749 * @inode - pointer to inode
1750 * @fattr - updated attributes
1751 *
1752 * After an operation that has changed the inode metadata, mark the
1753 * attribute cache as being invalid, then try to update it. Fake up
1754 * weak cache consistency data, if none exist.
1755 *
1756 * This function is mainly designed to be used by the ->write_done() functions.
1757 */
1758int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1759{
1760 int status;
1761
1762 spin_lock(&inode->i_lock);
8f8ba1d7 1763 nfs_fattr_set_barrier(fattr);
a08a8cd3 1764 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
d65f557f
TM		 1765 spin_unlock(&inode->i_lock);
1766 return status;
70ca8852 1767}
ddda8e0a 1768EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
70ca8852 1769
ea96d1ec
AS		 1770
1771static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1772 struct nfs_fattr *fattr)
1773{
1774 bool ret1 = true, ret2 = true;
1775
1776 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1777 ret1 = (nfsi->fileid == fattr->fileid);
1778 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1779 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1780 return ret1 || ret2;
1781}
1782
1da177e4
LT		 1783/*
1784 * Many nfs protocol calls return the new file attributes after
1785 * an operation. Here we update the inode to reflect the state
1786 * of the server's inode.
1787 *
1788 * This is a bit tricky because we have to make sure all dirty pages
1789 * have been sent off to the server before calling invalidate_inode_pages.
1790 * To make sure no other process adds more write requests while we try
1791 * our best to flush them, we make them sleep during the attribute refresh.
1792 *
1793 * A very similar scenario holds for the dir cache.
1794 */
24aa1fe6 1795static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1da177e4 1796{
8b4bdcf8 1797 struct nfs_server *server;
1da177e4 1798 struct nfs_inode *nfsi = NFS_I(inode);
951a143b 1799 loff_t cur_isize, new_isize;
2a3f5fd4 1800 unsigned long invalid = 0;
3e7d950a 1801 unsigned long now = jiffies;
62ab460c 1802 unsigned long save_cache_validity;
651b0e70 1803 bool have_writers = nfs_file_has_buffered_writers(nfsi);
944171cb 1804 bool cache_revalidated = true;
0b467264 1805 bool attr_changed = false;
c80d17c5 1806 bool have_delegation;
1da177e4 1807
1e8968c5 1808 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
3110ff80 1809 __func__, inode->i_sb->s_id, inode->i_ino,
4f1abd22 1810 nfs_display_fhandle_hash(NFS_FH(inode)),
1da177e4
LT		 1811 atomic_read(&inode->i_count), fattr->valid);
1812
ea96d1ec 1813 if (!nfs_fileid_valid(nfsi, fattr)) {
e73e6c9e
MT		 1814 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1815 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1816 NFS_SERVER(inode)->nfs_client->cl_hostname,
1817 inode->i_sb->s_id, (long long)nfsi->fileid,
1818 (long long)fattr->fileid);
1819 goto out_err;
1820 }
1da177e4
LT		 1821
1822 /*
1823 * Make sure the inode's type hasn't changed.
1824 */
e73e6c9e
MT		 1825 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1826 /*
1827 * Big trouble! The inode has become a different object.
1828 */
1e8968c5 1829 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
e73e6c9e
MT		 1830 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1831 goto out_err;
1832 }
1da177e4 1833
8b4bdcf8 1834 server = NFS_SERVER(inode);
a0356862 1835 /* Update the fsid? */
9e6e70f8 1836 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
c37dcd33 1837 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
36d43a43 1838 !IS_AUTOMOUNT(inode))
8b4bdcf8
TM		 1839 server->fsid = fattr->fsid;
1840
c80d17c5
TM		 1841 /* Save the delegation state before clearing cache_validity */
1842 have_delegation = nfs_have_delegated_attributes(inode);
1843
1da177e4
LT		 1844 /*
1845 * Update the read time so we don't revalidate too often.
1846 */
33801147 1847 nfsi->read_cache_jiffies = fattr->time_start;
3e7d950a 1848
62ab460c
TM		 1849 save_cache_validity = nfsi->cache_validity;
1850 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1851 | NFS_INO_INVALID_ATIME
1852 | NFS_INO_REVAL_FORCED
1853 | NFS_INO_REVAL_PAGECACHE);
1da177e4 1854
a895b4a1 1855 /* Do atomic weak cache consistency updates */
783b194c 1856 nfs_wcc_update_inode(inode, fattr);
a895b4a1 1857
944171cb
BC		 1858 if (pnfs_layoutcommit_outstanding(inode)) {
1859 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1860 cache_revalidated = false;
1861 }
10b7e9ad 1862
47aabaa7 1863 /* More cache consistency checks */
9e6e70f8 1864 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
c472c07b 1865 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
38512aa9 1866 /* Could it be a race with writeback? */
c80d17c5 1867 if (!(have_writers || have_delegation)) {
0b467264 1868 invalid |= NFS_INO_INVALID_DATA
38512aa9
TM		 1869 | NFS_INO_INVALID_ACCESS
1870 | NFS_INO_INVALID_ACL;
cac88f94 1871 /* Force revalidate of all attributes */
16e14375
TM		 1872 save_cache_validity |= NFS_INO_INVALID_CTIME
1873 | NFS_INO_INVALID_MTIME
1874 | NFS_INO_INVALID_SIZE
1875 | NFS_INO_INVALID_OTHER;
38512aa9
TM		 1876 if (S_ISDIR(inode->i_mode))
1877 nfs_force_lookup_revalidate(inode);
c80d17c5
TM		 1878 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1879 inode->i_sb->s_id,
1880 inode->i_ino);
38512aa9 1881 }
1eb5d98f 1882 inode_set_iversion_raw(inode, fattr->change_attr);
0b467264 1883 attr_changed = true;
9e6e70f8 1884 }
ade14a7d 1885 } else {
8619ddd0 1886 nfsi->cache_validity |= save_cache_validity &
16e14375 1887 (NFS_INO_INVALID_CHANGE
8619ddd0
TM		 1888 | NFS_INO_REVAL_PAGECACHE
1889 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1890 cache_revalidated = false;
1891 }
9e6e70f8
TM		 1892
1893 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
95582b00 1894 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
ade14a7d 1895 } else if (server->caps & NFS_CAP_MTIME) {
43b6535e 1896 nfsi->cache_validity |= save_cache_validity &
16e14375 1897 (NFS_INO_INVALID_MTIME
62ab460c 1898 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1899 cache_revalidated = false;
1900 }
62ab460c 1901
9e6e70f8 1902 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
95582b00 1903 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
ade14a7d 1904 } else if (server->caps & NFS_CAP_CTIME) {
43b6535e 1905 nfsi->cache_validity |= save_cache_validity &
16e14375 1906 (NFS_INO_INVALID_CTIME
62ab460c 1907 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1908 cache_revalidated = false;
1909 }
47aabaa7 1910
951a143b 1911 /* Check if our cached file size is stale */
9e6e70f8
TM		 1912 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1913 new_isize = nfs_size_to_loff_t(fattr->size);
1914 cur_isize = i_size_read(inode);
c80d17c5 1915 if (new_isize != cur_isize && !have_delegation) {
9e6e70f8
TM		 1916 /* Do we perhaps have any outstanding writes, or has
1917 * the file grown beyond our last write? */
a6b6d5b8 1918 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
9e6e70f8 1919 i_size_write(inode, new_isize);
ca0daa27 1920 if (!have_writers)
16e14375 1921 invalid |= NFS_INO_INVALID_DATA;
0b467264 1922 attr_changed = true;
9e6e70f8 1923 }
60c16ea8
HJ		 1924 dprintk("NFS: isize change on server for file %s/%ld "
1925 "(%Ld to %Ld)\n",
1926 inode->i_sb->s_id,
1927 inode->i_ino,
1928 (long long)cur_isize,
1929 (long long)new_isize);
1da177e4 1930 }
ade14a7d 1931 } else {
43b6535e 1932 nfsi->cache_validity |= save_cache_validity &
16e14375 1933 (NFS_INO_INVALID_SIZE
62ab460c
TM		 1934 | NFS_INO_REVAL_PAGECACHE
1935 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1936 cache_revalidated = false;
1937 }
1da177e4 1938
1da177e4 1939
9e6e70f8 1940 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
95582b00 1941 inode->i_atime = timespec_to_timespec64(fattr->atime);
ade14a7d 1942 else if (server->caps & NFS_CAP_ATIME) {
43b6535e
TM		 1943 nfsi->cache_validity |= save_cache_validity &
1944 (NFS_INO_INVALID_ATIME
62ab460c 1945 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1946 cache_revalidated = false;
1947 }
1da177e4 1948
9e6e70f8
TM		 1949 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1950 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
9b4b3513
TM		 1951 umode_t newmode = inode->i_mode & S_IFMT;
1952 newmode |= fattr->mode & S_IALLUGO;
1953 inode->i_mode = newmode;
16e14375 1954 invalid |= NFS_INO_INVALID_ACCESS
0b467264
TM		 1955 | NFS_INO_INVALID_ACL;
1956 attr_changed = true;
9e6e70f8 1957 }
ade14a7d 1958 } else if (server->caps & NFS_CAP_MODE) {
43b6535e 1959 nfsi->cache_validity |= save_cache_validity &
0b467264 1960 (NFS_INO_INVALID_OTHER
62ab460c 1961 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1962 cache_revalidated = false;
1963 }
62ab460c 1964
9e6e70f8 1965 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
9ff593c4 1966 if (!uid_eq(inode->i_uid, fattr->uid)) {
16e14375 1967 invalid |= NFS_INO_INVALID_ACCESS
0b467264 1968 | NFS_INO_INVALID_ACL;
9e6e70f8 1969 inode->i_uid = fattr->uid;
0b467264 1970 attr_changed = true;
9e6e70f8 1971 }
ade14a7d 1972 } else if (server->caps & NFS_CAP_OWNER) {
43b6535e 1973 nfsi->cache_validity |= save_cache_validity &
0b467264 1974 (NFS_INO_INVALID_OTHER
62ab460c 1975 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1976 cache_revalidated = false;
1977 }
62ab460c 1978
9e6e70f8 1979 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
9ff593c4 1980 if (!gid_eq(inode->i_gid, fattr->gid)) {
16e14375 1981 invalid |= NFS_INO_INVALID_ACCESS
0b467264 1982 | NFS_INO_INVALID_ACL;
9e6e70f8 1983 inode->i_gid = fattr->gid;
0b467264 1984 attr_changed = true;
9e6e70f8 1985 }
ade14a7d 1986 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
43b6535e 1987 nfsi->cache_validity |= save_cache_validity &
0b467264 1988 (NFS_INO_INVALID_OTHER
62ab460c 1989 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1990 cache_revalidated = false;
1991 }
921615f1 1992
9e6e70f8
TM		 1993 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1994 if (inode->i_nlink != fattr->nlink) {
9e6e70f8
TM		 1995 if (S_ISDIR(inode->i_mode))
1996 invalid |= NFS_INO_INVALID_DATA;
bfe86848 1997 set_nlink(inode, fattr->nlink);
0b467264 1998 attr_changed = true;
9e6e70f8 1999 }
ade14a7d 2000 } else if (server->caps & NFS_CAP_NLINK) {
43b6535e 2001 nfsi->cache_validity |= save_cache_validity &
16e14375 2002 (NFS_INO_INVALID_OTHER
62ab460c 2003 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 2004 cache_revalidated = false;
2005 }
1da177e4 2006
9e6e70f8 2007 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 2008 /*
2009 * report the blocks in 512byte units
2010 */
2011 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
ade14a7d 2012 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
9e6e70f8 2013 inode->i_blocks = fattr->du.nfs2.blocks;
ade14a7d
TM		 2014 else
2015 cache_revalidated = false;
1da177e4
LT		 2016
2017 /* Update attrtimeo value if we're out of the unstable period */
0b467264 2018 if (attr_changed) {
cac88f94 2019 invalid &= ~NFS_INO_INVALID_ATTR;
91d5b470 2020 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1da177e4 2021 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
3e7d950a 2022 nfsi->attrtimeo_timestamp = now;
f5062003 2023 /* Set barrier to be more recent than all outstanding updates */
4704f0e2 2024 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
6d2b2966 2025 } else {
ade14a7d
TM		 2026 if (cache_revalidated) {
2027 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2028 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2029 nfsi->attrtimeo <<= 1;
2030 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2031 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2032 }
6d2b2966
TM		 2033 nfsi->attrtimeo_timestamp = now;
2034 }
f5062003
TM		 2035 /* Set the barrier to be more recent than this fattr */
2036 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
2037 nfsi->attr_gencount = fattr->gencount;
1da177e4 2038 }
c812012f 2039
1da177e4
LT		 2040 /* Don't invalidate the data if we were to blame */
2041 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2042 || S_ISLNK(inode->i_mode)))
2043 invalid &= ~NFS_INO_INVALID_DATA;
c80d17c5 2044 nfs_set_cache_invalid(inode, invalid);
de242c0b 2045
1da177e4 2046 return 0;
b37b03b7 2047 out_err:
1da177e4
LT		 2048 /*
2049 * No need to worry about unhashing the dentry, as the
2050 * lookup validation will know that the inode is bad.
2051 * (But we fall through to invalidate the caches.)
2052 */
2053 nfs_invalidate_inode(inode);
1da177e4
LT		 2054 return -ESTALE;
2055}
2056
f7b422b1 2057struct inode *nfs_alloc_inode(struct super_block *sb)
1da177e4
LT		 2058{
2059 struct nfs_inode *nfsi;
c456aacf 2060 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1da177e4
LT		 2061 if (!nfsi)
2062 return NULL;
55296809
CL		 2063 nfsi->flags = 0UL;
2064 nfsi->cache_validity = 0UL;
89d77c8f 2065#if IS_ENABLED(CONFIG_NFS_V4)
e50a1c2e
BF		 2066 nfsi->nfs4_acl = NULL;
2067#endif /* CONFIG_NFS_V4 */
1da177e4
LT		 2068 return &nfsi->vfs_inode;
2069}
89d77c8f 2070EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1da177e4 2071
fa0d7e3d 2072static void nfs_i_callback(struct rcu_head *head)
1da177e4 2073{
fa0d7e3d 2074 struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4
LT		 2075 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2076}
2077
fa0d7e3d
NP		 2078void nfs_destroy_inode(struct inode *inode)
2079{
2080 call_rcu(&inode->i_rcu, nfs_i_callback);
2081}
89d77c8f 2082EXPORT_SYMBOL_GPL(nfs_destroy_inode);
fa0d7e3d 2083
d75d5414
AM		 2084static inline void nfs4_init_once(struct nfs_inode *nfsi)
2085{
89d77c8f 2086#if IS_ENABLED(CONFIG_NFS_V4)
d75d5414
AM		 2087 INIT_LIST_HEAD(&nfsi->open_states);
2088 nfsi->delegation = NULL;
d75d5414 2089 init_rwsem(&nfsi->rwsem);
e5e94017 2090 nfsi->layout = NULL;
d75d5414
AM		 2091#endif
2092}
f7b422b1 2093
51cc5068 2094static void init_once(void *foo)
1da177e4
LT		 2095{
2096 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2097
a35afb83 2098 inode_init_once(&nfsi->vfs_inode);
a35afb83
CL		 2099 INIT_LIST_HEAD(&nfsi->open_files);
2100 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2101 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
ea2cf228 2102 INIT_LIST_HEAD(&nfsi->commit_info.list);
a6b6d5b8 2103 atomic_long_set(&nfsi->nrequests, 0);
5cb953d4 2104 atomic_long_set(&nfsi->commit_info.ncommit, 0);
1a0de48a 2105 atomic_set(&nfsi->commit_info.rpcs_out, 0);
884be175 2106 init_rwsem(&nfsi->rmdir_sem);
e824f99a 2107 mutex_init(&nfsi->commit_mutex);
a35afb83 2108 nfs4_init_once(nfsi);
1da177e4 2109}
20c2df83 2110
f7b422b1 2111static int __init nfs_init_inodecache(void)
1da177e4
LT		 2112{
2113 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2114 sizeof(struct nfs_inode),
fffb60f9 2115 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 2116 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 2117 init_once);
1da177e4
LT		 2118 if (nfs_inode_cachep == NULL)
2119 return -ENOMEM;
2120
2121 return 0;
2122}
2123
266bee88 2124static void nfs_destroy_inodecache(void)
1da177e4 2125{
8c0a8537
KS		 2126 /*
2127 * Make sure all delayed rcu free inodes are flushed before we
2128 * destroy cache.
2129 */
2130 rcu_barrier();
1a1d92c1 2131 kmem_cache_destroy(nfs_inode_cachep);
1da177e4
LT		 2132}
2133
5746006f 2134struct workqueue_struct *nfsiod_workqueue;
89d77c8f 2135EXPORT_SYMBOL_GPL(nfsiod_workqueue);
5746006f
TM		 2136
2137/*
2138 * start up the nfsiod workqueue
2139 */
2140static int nfsiod_start(void)
2141{
2142 struct workqueue_struct *wq;
2143 dprintk("RPC: creating workqueue nfsiod\n");
ada609ee 2144 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
5746006f
TM		 2145 if (wq == NULL)
2146 return -ENOMEM;
2147 nfsiod_workqueue = wq;
2148 return 0;
2149}
2150
2151/*
2152 * Destroy the nfsiod workqueue
2153 */
2154static void nfsiod_stop(void)
2155{
2156 struct workqueue_struct *wq;
2157
2158 wq = nfsiod_workqueue;
2159 if (wq == NULL)
2160 return;
2161 nfsiod_workqueue = NULL;
2162 destroy_workqueue(wq);
2163}
2164
c7d03a00 2165unsigned int nfs_net_id;
9e2e74db 2166EXPORT_SYMBOL_GPL(nfs_net_id);
1b340d01
SK		 2167
2168static int nfs_net_init(struct net *net)
2169{
6b13168b 2170 nfs_clients_init(net);
65b38851 2171 return nfs_fs_proc_net_init(net);
1b340d01
SK		 2172}
2173
2174static void nfs_net_exit(struct net *net)
2175{
b0b5352d
VA		 2176 struct nfs_net *nn = net_generic(net, nfs_net_id);
2177
65b38851 2178 nfs_fs_proc_net_exit(net);
28cd1b3f 2179 nfs_cleanup_cb_ident_idr(net);
b0b5352d
VA		 2180 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
2181 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
1b340d01
SK		 2182}
2183
2184static struct pernet_operations nfs_net_ops = {
2185 .init = nfs_net_init,
2186 .exit = nfs_net_exit,
2187 .id = &nfs_net_id,
2188 .size = sizeof(struct nfs_net),
2189};
2190
1da177e4
LT		 2191/*
2192 * Initialize NFS
2193 */
2194static int __init init_nfs_fs(void)
2195{
2196 int err;
2197
1b340d01 2198 err = register_pernet_subsys(&nfs_net_ops);
e571cbf1 2199 if (err < 0)
89d77c8f 2200 goto out9;
e571cbf1 2201
8ec442ae
DH		 2202 err = nfs_fscache_register();
2203 if (err < 0)
89d77c8f 2204 goto out8;
8ec442ae 2205
5746006f
TM		 2206 err = nfsiod_start();
2207 if (err)
89d77c8f 2208 goto out7;
5746006f 2209
6aaca566
DH		 2210 err = nfs_fs_proc_init();
2211 if (err)
89d77c8f 2212 goto out6;
6aaca566 2213
1da177e4
LT		 2214 err = nfs_init_nfspagecache();
2215 if (err)
89d77c8f 2216 goto out5;
1da177e4
LT		 2217
2218 err = nfs_init_inodecache();
2219 if (err)
89d77c8f 2220 goto out4;
1da177e4
LT		 2221
2222 err = nfs_init_readpagecache();
2223 if (err)
89d77c8f 2224 goto out3;
1da177e4
LT		 2225
2226 err = nfs_init_writepagecache();
2227 if (err)
89d77c8f 2228 goto out2;
1da177e4 2229
1da177e4
LT		 2230 err = nfs_init_directcache();
2231 if (err)
89d77c8f 2232 goto out1;
1da177e4 2233
ec7652aa 2234 rpc_proc_register(&init_net, &nfs_rpcstat);
cd738ee9
KM		 2235
2236 err = register_nfs_fs();
2237 if (err)
129d1977
BS		 2238 goto out0;
2239
1da177e4 2240 return 0;
129d1977 2241out0:
ec7652aa 2242 rpc_proc_unregister(&init_net, "nfs");
1da177e4 2243 nfs_destroy_directcache();
89d77c8f 2244out1:
129d1977 2245 nfs_destroy_writepagecache();
89d77c8f 2246out2:
129d1977 2247 nfs_destroy_readpagecache();
89d77c8f 2248out3:
129d1977 2249 nfs_destroy_inodecache();
89d77c8f 2250out4:
129d1977 2251 nfs_destroy_nfspagecache();
89d77c8f 2252out5:
129d1977 2253 nfs_fs_proc_exit();
89d77c8f 2254out6:
129d1977 2255 nfsiod_stop();
89d77c8f 2256out7:
129d1977 2257 nfs_fscache_unregister();
89d77c8f 2258out8:
129d1977 2259 unregister_pernet_subsys(&nfs_net_ops);
89d77c8f 2260out9:
1da177e4
LT		 2261 return err;
2262}
2263
2264static void __exit exit_nfs_fs(void)
2265{
1da177e4 2266 nfs_destroy_directcache();
1da177e4
LT		 2267 nfs_destroy_writepagecache();
2268 nfs_destroy_readpagecache();
2269 nfs_destroy_inodecache();
2270 nfs_destroy_nfspagecache();
8ec442ae 2271 nfs_fscache_unregister();
1b340d01 2272 unregister_pernet_subsys(&nfs_net_ops);
ec7652aa 2273 rpc_proc_unregister(&init_net, "nfs");
f7b422b1 2274 unregister_nfs_fs();
6aaca566 2275 nfs_fs_proc_exit();
5746006f 2276 nfsiod_stop();
1da177e4
LT		 2277}
2278
2279/* Not quite true; I just maintain it */
2280MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2281MODULE_LICENSE("GPL");
f43bf0be 2282module_param(enable_ino64, bool, 0644);
1da177e4
LT		 2283
2284module_init(init_nfs_fs)
2285module_exit(exit_nfs_fs)
Linux 6.x block layer and io_uring tree(s)