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1/*
2 * linux/fs/nfs/inode.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs inode and superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
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
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/sched.h>
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>
28#include <linux/sunrpc/metrics.h>
29#include <linux/nfs_fs.h>
30#include <linux/nfs_mount.h>
31#include <linux/nfs4_mount.h>
32#include <linux/lockd/bind.h>
33#include <linux/seq_file.h>
34#include <linux/mount.h>
35#include <linux/nfs_idmap.h>
36#include <linux/vfs.h>
37#include <linux/inet.h>
38#include <linux/nfs_xdr.h>
39#include <linux/slab.h>
40#include <linux/compat.h>
41
42#include <asm/system.h>
43#include <asm/uaccess.h>
44
45#include "nfs4_fs.h"
46#include "callback.h"
47#include "delegation.h"
48#include "iostat.h"
49#include "internal.h"
50#include "fscache.h"
51#include "dns_resolve.h"
52#include "pnfs.h"
53
54#define NFSDBG_FACILITY NFSDBG_VFS
55
56#define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
57
58/* Default is to see 64-bit inode numbers */
59static int enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
60
61static void nfs_invalidate_inode(struct inode *);
62static int nfs_update_inode(struct inode *, struct nfs_fattr *);
63
64static struct kmem_cache * nfs_inode_cachep;
65
66static inline unsigned long
67nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
68{
69 return nfs_fileid_to_ino_t(fattr->fileid);
70}
71
72/**
73 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
74 * @word: long word containing the bit lock
75 */
76int nfs_wait_bit_killable(void *word)
77{
78 if (fatal_signal_pending(current))
79 return -ERESTARTSYS;
80 schedule();
81 return 0;
82}
83
84/**
85 * nfs_compat_user_ino64 - returns the user-visible inode number
86 * @fileid: 64-bit fileid
87 *
88 * This function returns a 32-bit inode number if the boot parameter
89 * nfs.enable_ino64 is zero.
90 */
91u64 nfs_compat_user_ino64(u64 fileid)
92{
93#ifdef CONFIG_COMPAT
94 compat_ulong_t ino;
95#else
96 unsigned long ino;
97#endif
98
99 if (enable_ino64)
100 return fileid;
101 ino = fileid;
102 if (sizeof(ino) < sizeof(fileid))
103 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
104 return ino;
105}
106
107static void nfs_clear_inode(struct inode *inode)
108{
109 /*
110 * The following should never happen...
111 */
112 BUG_ON(nfs_have_writebacks(inode));
113 BUG_ON(!list_empty(&NFS_I(inode)->open_files));
114 nfs_zap_acl_cache(inode);
115 nfs_access_zap_cache(inode);
116 nfs_fscache_release_inode_cookie(inode);
117}
118
119void nfs_evict_inode(struct inode *inode)
120{
121 truncate_inode_pages(&inode->i_data, 0);
122 end_writeback(inode);
123 nfs_clear_inode(inode);
124}
125
126/**
127 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
128 */
129int nfs_sync_mapping(struct address_space *mapping)
130{
131 int ret = 0;
132
133 if (mapping->nrpages != 0) {
134 unmap_mapping_range(mapping, 0, 0, 0);
135 ret = nfs_wb_all(mapping->host);
136 }
137 return ret;
138}
139
140/*
141 * Invalidate the local caches
142 */
143static void nfs_zap_caches_locked(struct inode *inode)
144{
145 struct nfs_inode *nfsi = NFS_I(inode);
146 int mode = inode->i_mode;
147
148 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
149
150 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
151 nfsi->attrtimeo_timestamp = jiffies;
152
153 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
154 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
155 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
156 else
157 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
158}
159
160void nfs_zap_caches(struct inode *inode)
161{
162 spin_lock(&inode->i_lock);
163 nfs_zap_caches_locked(inode);
164 spin_unlock(&inode->i_lock);
165}
166
167void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
168{
169 if (mapping->nrpages != 0) {
170 spin_lock(&inode->i_lock);
171 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
172 spin_unlock(&inode->i_lock);
173 }
174}
175
176void nfs_zap_acl_cache(struct inode *inode)
177{
178 void (*clear_acl_cache)(struct inode *);
179
180 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
181 if (clear_acl_cache != NULL)
182 clear_acl_cache(inode);
183 spin_lock(&inode->i_lock);
184 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
185 spin_unlock(&inode->i_lock);
186}
187
188void nfs_invalidate_atime(struct inode *inode)
189{
190 spin_lock(&inode->i_lock);
191 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
192 spin_unlock(&inode->i_lock);
193}
194
195/*
196 * Invalidate, but do not unhash, the inode.
197 * NB: must be called with inode->i_lock held!
198 */
199static void nfs_invalidate_inode(struct inode *inode)
200{
201 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
202 nfs_zap_caches_locked(inode);
203}
204
205struct nfs_find_desc {
206 struct nfs_fh *fh;
207 struct nfs_fattr *fattr;
208};
209
210/*
211 * In NFSv3 we can have 64bit inode numbers. In order to support
212 * this, and re-exported directories (also seen in NFSv2)
213 * we are forced to allow 2 different inodes to have the same
214 * i_ino.
215 */
216static int
217nfs_find_actor(struct inode *inode, void *opaque)
218{
219 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
220 struct nfs_fh *fh = desc->fh;
221 struct nfs_fattr *fattr = desc->fattr;
222
223 if (NFS_FILEID(inode) != fattr->fileid)
224 return 0;
225 if (nfs_compare_fh(NFS_FH(inode), fh))
226 return 0;
227 if (is_bad_inode(inode) || NFS_STALE(inode))
228 return 0;
229 return 1;
230}
231
232static int
233nfs_init_locked(struct inode *inode, void *opaque)
234{
235 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
236 struct nfs_fattr *fattr = desc->fattr;
237
238 set_nfs_fileid(inode, fattr->fileid);
239 nfs_copy_fh(NFS_FH(inode), desc->fh);
240 return 0;
241}
242
243/*
244 * This is our front-end to iget that looks up inodes by file handle
245 * instead of inode number.
246 */
247struct inode *
248nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
249{
250 struct nfs_find_desc desc = {
251 .fh = fh,
252 .fattr = fattr
253 };
254 struct inode *inode = ERR_PTR(-ENOENT);
255 unsigned long hash;
256
257 nfs_attr_check_mountpoint(sb, fattr);
258
259 if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
260 !nfs_attr_use_mounted_on_fileid(fattr))
261 goto out_no_inode;
262 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
263 goto out_no_inode;
264
265 hash = nfs_fattr_to_ino_t(fattr);
266
267 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
268 if (inode == NULL) {
269 inode = ERR_PTR(-ENOMEM);
270 goto out_no_inode;
271 }
272
273 if (inode->i_state & I_NEW) {
274 struct nfs_inode *nfsi = NFS_I(inode);
275 unsigned long now = jiffies;
276
277 /* We set i_ino for the few things that still rely on it,
278 * such as stat(2) */
279 inode->i_ino = hash;
280
281 /* We can't support update_atime(), since the server will reset it */
282 inode->i_flags |= S_NOATIME|S_NOCMTIME;
283 inode->i_mode = fattr->mode;
284 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
285 && nfs_server_capable(inode, NFS_CAP_MODE))
286 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
287 | NFS_INO_INVALID_ACCESS
288 | NFS_INO_INVALID_ACL;
289 /* Why so? Because we want revalidate for devices/FIFOs, and
290 * that's precisely what we have in nfs_file_inode_operations.
291 */
292 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
293 if (S_ISREG(inode->i_mode)) {
294 inode->i_fop = &nfs_file_operations;
295 inode->i_data.a_ops = &nfs_file_aops;
296 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
297 } else if (S_ISDIR(inode->i_mode)) {
298 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
299 inode->i_fop = &nfs_dir_operations;
300 inode->i_data.a_ops = &nfs_dir_aops;
301 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS))
302 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
303 /* Deal with crossing mountpoints */
304 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
305 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
306 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
307 inode->i_op = &nfs_referral_inode_operations;
308 else
309 inode->i_op = &nfs_mountpoint_inode_operations;
310 inode->i_fop = NULL;
311 inode->i_flags |= S_AUTOMOUNT;
312 }
313 } else if (S_ISLNK(inode->i_mode))
314 inode->i_op = &nfs_symlink_inode_operations;
315 else
316 init_special_inode(inode, inode->i_mode, fattr->rdev);
317
318 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
319 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
320 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
321 nfsi->change_attr = 0;
322 inode->i_size = 0;
323 inode->i_nlink = 0;
324 inode->i_uid = -2;
325 inode->i_gid = -2;
326 inode->i_blocks = 0;
327 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
328
329 nfsi->read_cache_jiffies = fattr->time_start;
330 nfsi->attr_gencount = fattr->gencount;
331 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
332 inode->i_atime = fattr->atime;
333 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
334 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
335 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
336 inode->i_mtime = fattr->mtime;
337 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
338 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
339 | NFS_INO_INVALID_DATA;
340 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
341 inode->i_ctime = fattr->ctime;
342 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
343 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
344 | NFS_INO_INVALID_ACCESS
345 | NFS_INO_INVALID_ACL;
346 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
347 nfsi->change_attr = fattr->change_attr;
348 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
349 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
350 | NFS_INO_INVALID_DATA;
351 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
352 inode->i_size = nfs_size_to_loff_t(fattr->size);
353 else
354 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
355 | NFS_INO_INVALID_DATA
356 | NFS_INO_REVAL_PAGECACHE;
357 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
358 inode->i_nlink = fattr->nlink;
359 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
360 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
361 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
362 inode->i_uid = fattr->uid;
363 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
364 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
365 | NFS_INO_INVALID_ACCESS
366 | NFS_INO_INVALID_ACL;
367 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
368 inode->i_gid = fattr->gid;
369 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
370 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
371 | NFS_INO_INVALID_ACCESS
372 | NFS_INO_INVALID_ACL;
373 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
374 inode->i_blocks = fattr->du.nfs2.blocks;
375 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
376 /*
377 * report the blocks in 512byte units
378 */
379 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
380 }
381 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
382 nfsi->attrtimeo_timestamp = now;
383 nfsi->access_cache = RB_ROOT;
384
385 nfs_fscache_init_inode_cookie(inode);
386
387 unlock_new_inode(inode);
388 } else
389 nfs_refresh_inode(inode, fattr);
390 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
391 inode->i_sb->s_id,
392 (long long)NFS_FILEID(inode),
393 atomic_read(&inode->i_count));
394
395out:
396 return inode;
397
398out_no_inode:
399 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
400 goto out;
401}
402
403#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE)
404
405int
406nfs_setattr(struct dentry *dentry, struct iattr *attr)
407{
408 struct inode *inode = dentry->d_inode;
409 struct nfs_fattr *fattr;
410 int error = -ENOMEM;
411
412 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
413
414 /* skip mode change if it's just for clearing setuid/setgid */
415 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
416 attr->ia_valid &= ~ATTR_MODE;
417
418 if (attr->ia_valid & ATTR_SIZE) {
419 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
420 attr->ia_valid &= ~ATTR_SIZE;
421 }
422
423 /* Optimization: if the end result is no change, don't RPC */
424 attr->ia_valid &= NFS_VALID_ATTRS;
425 if ((attr->ia_valid & ~ATTR_FILE) == 0)
426 return 0;
427
428 /* Write all dirty data */
429 if (S_ISREG(inode->i_mode))
430 nfs_wb_all(inode);
431
432 fattr = nfs_alloc_fattr();
433 if (fattr == NULL)
434 goto out;
435 /*
436 * Return any delegations if we're going to change ACLs
437 */
438 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
439 nfs_inode_return_delegation(inode);
440 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
441 if (error == 0)
442 nfs_refresh_inode(inode, fattr);
443 nfs_free_fattr(fattr);
444out:
445 return error;
446}
447
448/**
449 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
450 * @inode: inode of the file used
451 * @offset: file offset to start truncating
452 *
453 * This is a copy of the common vmtruncate, but with the locking
454 * corrected to take into account the fact that NFS requires
455 * inode->i_size to be updated under the inode->i_lock.
456 */
457static int nfs_vmtruncate(struct inode * inode, loff_t offset)
458{
459 loff_t oldsize;
460 int err;
461
462 err = inode_newsize_ok(inode, offset);
463 if (err)
464 goto out;
465
466 spin_lock(&inode->i_lock);
467 oldsize = inode->i_size;
468 i_size_write(inode, offset);
469 spin_unlock(&inode->i_lock);
470
471 truncate_pagecache(inode, oldsize, offset);
472out:
473 return err;
474}
475
476/**
477 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
478 * @inode: pointer to struct inode
479 * @attr: pointer to struct iattr
480 *
481 * Note: we do this in the *proc.c in order to ensure that
482 * it works for things like exclusive creates too.
483 */
484void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
485{
486 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
487 spin_lock(&inode->i_lock);
488 if ((attr->ia_valid & ATTR_MODE) != 0) {
489 int mode = attr->ia_mode & S_IALLUGO;
490 mode |= inode->i_mode & ~S_IALLUGO;
491 inode->i_mode = mode;
492 }
493 if ((attr->ia_valid & ATTR_UID) != 0)
494 inode->i_uid = attr->ia_uid;
495 if ((attr->ia_valid & ATTR_GID) != 0)
496 inode->i_gid = attr->ia_gid;
497 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
498 spin_unlock(&inode->i_lock);
499 }
500 if ((attr->ia_valid & ATTR_SIZE) != 0) {
501 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
502 nfs_vmtruncate(inode, attr->ia_size);
503 }
504}
505
506int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
507{
508 struct inode *inode = dentry->d_inode;
509 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
510 int err;
511
512 /* Flush out writes to the server in order to update c/mtime. */
513 if (S_ISREG(inode->i_mode)) {
514 err = filemap_write_and_wait(inode->i_mapping);
515 if (err)
516 goto out;
517 }
518
519 /*
520 * We may force a getattr if the user cares about atime.
521 *
522 * Note that we only have to check the vfsmount flags here:
523 * - NFS always sets S_NOATIME by so checking it would give a
524 * bogus result
525 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
526 * no point in checking those.
527 */
528 if ((mnt->mnt_flags & MNT_NOATIME) ||
529 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
530 need_atime = 0;
531
532 if (need_atime)
533 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
534 else
535 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
536 if (!err) {
537 generic_fillattr(inode, stat);
538 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
539 }
540out:
541 return err;
542}
543
544static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
545{
546 atomic_set(&l_ctx->count, 1);
547 l_ctx->lockowner = current->files;
548 l_ctx->pid = current->tgid;
549 INIT_LIST_HEAD(&l_ctx->list);
550}
551
552static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
553{
554 struct nfs_lock_context *pos;
555
556 list_for_each_entry(pos, &ctx->lock_context.list, list) {
557 if (pos->lockowner != current->files)
558 continue;
559 if (pos->pid != current->tgid)
560 continue;
561 atomic_inc(&pos->count);
562 return pos;
563 }
564 return NULL;
565}
566
567struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
568{
569 struct nfs_lock_context *res, *new = NULL;
570 struct inode *inode = ctx->dentry->d_inode;
571
572 spin_lock(&inode->i_lock);
573 res = __nfs_find_lock_context(ctx);
574 if (res == NULL) {
575 spin_unlock(&inode->i_lock);
576 new = kmalloc(sizeof(*new), GFP_KERNEL);
577 if (new == NULL)
578 return NULL;
579 nfs_init_lock_context(new);
580 spin_lock(&inode->i_lock);
581 res = __nfs_find_lock_context(ctx);
582 if (res == NULL) {
583 list_add_tail(&new->list, &ctx->lock_context.list);
584 new->open_context = ctx;
585 res = new;
586 new = NULL;
587 }
588 }
589 spin_unlock(&inode->i_lock);
590 kfree(new);
591 return res;
592}
593
594void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
595{
596 struct nfs_open_context *ctx = l_ctx->open_context;
597 struct inode *inode = ctx->dentry->d_inode;
598
599 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
600 return;
601 list_del(&l_ctx->list);
602 spin_unlock(&inode->i_lock);
603 kfree(l_ctx);
604}
605
606/**
607 * nfs_close_context - Common close_context() routine NFSv2/v3
608 * @ctx: pointer to context
609 * @is_sync: is this a synchronous close
610 *
611 * always ensure that the attributes are up to date if we're mounted
612 * with close-to-open semantics
613 */
614void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
615{
616 struct inode *inode;
617 struct nfs_server *server;
618
619 if (!(ctx->mode & FMODE_WRITE))
620 return;
621 if (!is_sync)
622 return;
623 inode = ctx->dentry->d_inode;
624 if (!list_empty(&NFS_I(inode)->open_files))
625 return;
626 server = NFS_SERVER(inode);
627 if (server->flags & NFS_MOUNT_NOCTO)
628 return;
629 nfs_revalidate_inode(server, inode);
630}
631
632struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred, fmode_t f_mode)
633{
634 struct nfs_open_context *ctx;
635
636 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
637 if (ctx != NULL) {
638 nfs_sb_active(dentry->d_sb);
639 ctx->dentry = dget(dentry);
640 ctx->cred = get_rpccred(cred);
641 ctx->state = NULL;
642 ctx->mode = f_mode;
643 ctx->flags = 0;
644 ctx->error = 0;
645 nfs_init_lock_context(&ctx->lock_context);
646 ctx->lock_context.open_context = ctx;
647 INIT_LIST_HEAD(&ctx->list);
648 }
649 return ctx;
650}
651
652struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
653{
654 if (ctx != NULL)
655 atomic_inc(&ctx->lock_context.count);
656 return ctx;
657}
658
659static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
660{
661 struct inode *inode = ctx->dentry->d_inode;
662 struct super_block *sb = ctx->dentry->d_sb;
663
664 if (!list_empty(&ctx->list)) {
665 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
666 return;
667 list_del(&ctx->list);
668 spin_unlock(&inode->i_lock);
669 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
670 return;
671 if (inode != NULL)
672 NFS_PROTO(inode)->close_context(ctx, is_sync);
673 if (ctx->cred != NULL)
674 put_rpccred(ctx->cred);
675 dput(ctx->dentry);
676 nfs_sb_deactive(sb);
677 kfree(ctx);
678}
679
680void put_nfs_open_context(struct nfs_open_context *ctx)
681{
682 __put_nfs_open_context(ctx, 0);
683}
684
685/*
686 * Ensure that mmap has a recent RPC credential for use when writing out
687 * shared pages
688 */
689void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
690{
691 struct inode *inode = filp->f_path.dentry->d_inode;
692 struct nfs_inode *nfsi = NFS_I(inode);
693
694 filp->private_data = get_nfs_open_context(ctx);
695 spin_lock(&inode->i_lock);
696 list_add(&ctx->list, &nfsi->open_files);
697 spin_unlock(&inode->i_lock);
698}
699
700/*
701 * Given an inode, search for an open context with the desired characteristics
702 */
703struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
704{
705 struct nfs_inode *nfsi = NFS_I(inode);
706 struct nfs_open_context *pos, *ctx = NULL;
707
708 spin_lock(&inode->i_lock);
709 list_for_each_entry(pos, &nfsi->open_files, list) {
710 if (cred != NULL && pos->cred != cred)
711 continue;
712 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
713 continue;
714 ctx = get_nfs_open_context(pos);
715 break;
716 }
717 spin_unlock(&inode->i_lock);
718 return ctx;
719}
720
721static void nfs_file_clear_open_context(struct file *filp)
722{
723 struct inode *inode = filp->f_path.dentry->d_inode;
724 struct nfs_open_context *ctx = nfs_file_open_context(filp);
725
726 if (ctx) {
727 filp->private_data = NULL;
728 spin_lock(&inode->i_lock);
729 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
730 spin_unlock(&inode->i_lock);
731 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
732 }
733}
734
735/*
736 * These allocate and release file read/write context information.
737 */
738int nfs_open(struct inode *inode, struct file *filp)
739{
740 struct nfs_open_context *ctx;
741 struct rpc_cred *cred;
742
743 cred = rpc_lookup_cred();
744 if (IS_ERR(cred))
745 return PTR_ERR(cred);
746 ctx = alloc_nfs_open_context(filp->f_path.dentry, cred, filp->f_mode);
747 put_rpccred(cred);
748 if (ctx == NULL)
749 return -ENOMEM;
750 nfs_file_set_open_context(filp, ctx);
751 put_nfs_open_context(ctx);
752 nfs_fscache_set_inode_cookie(inode, filp);
753 return 0;
754}
755
756int nfs_release(struct inode *inode, struct file *filp)
757{
758 nfs_file_clear_open_context(filp);
759 return 0;
760}
761
762/*
763 * This function is called whenever some part of NFS notices that
764 * the cached attributes have to be refreshed.
765 */
766int
767__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
768{
769 int status = -ESTALE;
770 struct nfs_fattr *fattr = NULL;
771 struct nfs_inode *nfsi = NFS_I(inode);
772
773 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
774 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
775
776 if (is_bad_inode(inode))
777 goto out;
778 if (NFS_STALE(inode))
779 goto out;
780
781 status = -ENOMEM;
782 fattr = nfs_alloc_fattr();
783 if (fattr == NULL)
784 goto out;
785
786 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
787 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr);
788 if (status != 0) {
789 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
790 inode->i_sb->s_id,
791 (long long)NFS_FILEID(inode), status);
792 if (status == -ESTALE) {
793 nfs_zap_caches(inode);
794 if (!S_ISDIR(inode->i_mode))
795 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
796 }
797 goto out;
798 }
799
800 status = nfs_refresh_inode(inode, fattr);
801 if (status) {
802 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
803 inode->i_sb->s_id,
804 (long long)NFS_FILEID(inode), status);
805 goto out;
806 }
807
808 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
809 nfs_zap_acl_cache(inode);
810
811 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
812 inode->i_sb->s_id,
813 (long long)NFS_FILEID(inode));
814
815 out:
816 nfs_free_fattr(fattr);
817 return status;
818}
819
820int nfs_attribute_timeout(struct inode *inode)
821{
822 struct nfs_inode *nfsi = NFS_I(inode);
823
824 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
825}
826
827static int nfs_attribute_cache_expired(struct inode *inode)
828{
829 if (nfs_have_delegated_attributes(inode))
830 return 0;
831 return nfs_attribute_timeout(inode);
832}
833
834/**
835 * nfs_revalidate_inode - Revalidate the inode attributes
836 * @server - pointer to nfs_server struct
837 * @inode - pointer to inode struct
838 *
839 * Updates inode attribute information by retrieving the data from the server.
840 */
841int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
842{
843 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
844 && !nfs_attribute_cache_expired(inode))
845 return NFS_STALE(inode) ? -ESTALE : 0;
846 return __nfs_revalidate_inode(server, inode);
847}
848
849static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
850{
851 struct nfs_inode *nfsi = NFS_I(inode);
852
853 if (mapping->nrpages != 0) {
854 int ret = invalidate_inode_pages2(mapping);
855 if (ret < 0)
856 return ret;
857 }
858 spin_lock(&inode->i_lock);
859 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
860 if (S_ISDIR(inode->i_mode))
861 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
862 spin_unlock(&inode->i_lock);
863 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
864 nfs_fscache_reset_inode_cookie(inode);
865 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
866 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
867 return 0;
868}
869
870/**
871 * nfs_revalidate_mapping - Revalidate the pagecache
872 * @inode - pointer to host inode
873 * @mapping - pointer to mapping
874 */
875int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
876{
877 struct nfs_inode *nfsi = NFS_I(inode);
878 int ret = 0;
879
880 if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
881 || nfs_attribute_cache_expired(inode)
882 || NFS_STALE(inode)) {
883 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
884 if (ret < 0)
885 goto out;
886 }
887 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
888 ret = nfs_invalidate_mapping(inode, mapping);
889out:
890 return ret;
891}
892
893static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
894{
895 struct nfs_inode *nfsi = NFS_I(inode);
896 unsigned long ret = 0;
897
898 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
899 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
900 && nfsi->change_attr == fattr->pre_change_attr) {
901 nfsi->change_attr = fattr->change_attr;
902 if (S_ISDIR(inode->i_mode))
903 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
904 ret |= NFS_INO_INVALID_ATTR;
905 }
906 /* If we have atomic WCC data, we may update some attributes */
907 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
908 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
909 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
910 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
911 ret |= NFS_INO_INVALID_ATTR;
912 }
913
914 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
915 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
916 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
917 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
918 if (S_ISDIR(inode->i_mode))
919 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
920 ret |= NFS_INO_INVALID_ATTR;
921 }
922 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
923 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
924 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
925 && nfsi->npages == 0) {
926 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
927 ret |= NFS_INO_INVALID_ATTR;
928 }
929 return ret;
930}
931
932/**
933 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
934 * @inode - pointer to inode
935 * @fattr - updated attributes
936 *
937 * Verifies the attribute cache. If we have just changed the attributes,
938 * so that fattr carries weak cache consistency data, then it may
939 * also update the ctime/mtime/change_attribute.
940 */
941static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
942{
943 struct nfs_inode *nfsi = NFS_I(inode);
944 loff_t cur_size, new_isize;
945 unsigned long invalid = 0;
946
947
948 /* Has the inode gone and changed behind our back? */
949 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
950 return -EIO;
951 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
952 return -EIO;
953
954 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
955 nfsi->change_attr != fattr->change_attr)
956 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
957
958 /* Verify a few of the more important attributes */
959 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
960 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
961
962 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
963 cur_size = i_size_read(inode);
964 new_isize = nfs_size_to_loff_t(fattr->size);
965 if (cur_size != new_isize && nfsi->npages == 0)
966 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
967 }
968
969 /* Have any file permissions changed? */
970 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
971 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
972 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && inode->i_uid != fattr->uid)
973 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
974 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && inode->i_gid != fattr->gid)
975 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
976
977 /* Has the link count changed? */
978 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
979 invalid |= NFS_INO_INVALID_ATTR;
980
981 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
982 invalid |= NFS_INO_INVALID_ATIME;
983
984 if (invalid != 0)
985 nfsi->cache_validity |= invalid;
986
987 nfsi->read_cache_jiffies = fattr->time_start;
988 return 0;
989}
990
991static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
992{
993 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
994 return 0;
995 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
996}
997
998static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
999{
1000 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1001 return 0;
1002 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1003}
1004
1005static atomic_long_t nfs_attr_generation_counter;
1006
1007static unsigned long nfs_read_attr_generation_counter(void)
1008{
1009 return atomic_long_read(&nfs_attr_generation_counter);
1010}
1011
1012unsigned long nfs_inc_attr_generation_counter(void)
1013{
1014 return atomic_long_inc_return(&nfs_attr_generation_counter);
1015}
1016
1017void nfs_fattr_init(struct nfs_fattr *fattr)
1018{
1019 fattr->valid = 0;
1020 fattr->time_start = jiffies;
1021 fattr->gencount = nfs_inc_attr_generation_counter();
1022}
1023
1024struct nfs_fattr *nfs_alloc_fattr(void)
1025{
1026 struct nfs_fattr *fattr;
1027
1028 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1029 if (fattr != NULL)
1030 nfs_fattr_init(fattr);
1031 return fattr;
1032}
1033
1034struct nfs_fh *nfs_alloc_fhandle(void)
1035{
1036 struct nfs_fh *fh;
1037
1038 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1039 if (fh != NULL)
1040 fh->size = 0;
1041 return fh;
1042}
1043
1044/**
1045 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1046 * @inode - pointer to inode
1047 * @fattr - attributes
1048 *
1049 * Attempt to divine whether or not an RPC call reply carrying stale
1050 * attributes got scheduled after another call carrying updated ones.
1051 *
1052 * To do so, the function first assumes that a more recent ctime means
1053 * that the attributes in fattr are newer, however it also attempt to
1054 * catch the case where ctime either didn't change, or went backwards
1055 * (if someone reset the clock on the server) by looking at whether
1056 * or not this RPC call was started after the inode was last updated.
1057 * Note also the check for wraparound of 'attr_gencount'
1058 *
1059 * The function returns 'true' if it thinks the attributes in 'fattr' are
1060 * more recent than the ones cached in the inode.
1061 *
1062 */
1063static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1064{
1065 const struct nfs_inode *nfsi = NFS_I(inode);
1066
1067 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1068 nfs_ctime_need_update(inode, fattr) ||
1069 nfs_size_need_update(inode, fattr) ||
1070 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1071}
1072
1073static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1074{
1075 if (nfs_inode_attrs_need_update(inode, fattr))
1076 return nfs_update_inode(inode, fattr);
1077 return nfs_check_inode_attributes(inode, fattr);
1078}
1079
1080/**
1081 * nfs_refresh_inode - try to update the inode attribute cache
1082 * @inode - pointer to inode
1083 * @fattr - updated attributes
1084 *
1085 * Check that an RPC call that returned attributes has not overlapped with
1086 * other recent updates of the inode metadata, then decide whether it is
1087 * safe to do a full update of the inode attributes, or whether just to
1088 * call nfs_check_inode_attributes.
1089 */
1090int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1091{
1092 int status;
1093
1094 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1095 return 0;
1096 spin_lock(&inode->i_lock);
1097 status = nfs_refresh_inode_locked(inode, fattr);
1098 spin_unlock(&inode->i_lock);
1099
1100 return status;
1101}
1102
1103static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1104{
1105 struct nfs_inode *nfsi = NFS_I(inode);
1106
1107 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1108 if (S_ISDIR(inode->i_mode))
1109 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1110 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1111 return 0;
1112 return nfs_refresh_inode_locked(inode, fattr);
1113}
1114
1115/**
1116 * nfs_post_op_update_inode - try to update the inode attribute cache
1117 * @inode - pointer to inode
1118 * @fattr - updated attributes
1119 *
1120 * After an operation that has changed the inode metadata, mark the
1121 * attribute cache as being invalid, then try to update it.
1122 *
1123 * NB: if the server didn't return any post op attributes, this
1124 * function will force the retrieval of attributes before the next
1125 * NFS request. Thus it should be used only for operations that
1126 * are expected to change one or more attributes, to avoid
1127 * unnecessary NFS requests and trips through nfs_update_inode().
1128 */
1129int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1130{
1131 int status;
1132
1133 spin_lock(&inode->i_lock);
1134 status = nfs_post_op_update_inode_locked(inode, fattr);
1135 spin_unlock(&inode->i_lock);
1136 return status;
1137}
1138
1139/**
1140 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1141 * @inode - pointer to inode
1142 * @fattr - updated attributes
1143 *
1144 * After an operation that has changed the inode metadata, mark the
1145 * attribute cache as being invalid, then try to update it. Fake up
1146 * weak cache consistency data, if none exist.
1147 *
1148 * This function is mainly designed to be used by the ->write_done() functions.
1149 */
1150int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1151{
1152 int status;
1153
1154 spin_lock(&inode->i_lock);
1155 /* Don't do a WCC update if these attributes are already stale */
1156 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1157 !nfs_inode_attrs_need_update(inode, fattr)) {
1158 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1159 | NFS_ATTR_FATTR_PRESIZE
1160 | NFS_ATTR_FATTR_PREMTIME
1161 | NFS_ATTR_FATTR_PRECTIME);
1162 goto out_noforce;
1163 }
1164 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1165 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1166 fattr->pre_change_attr = NFS_I(inode)->change_attr;
1167 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1168 }
1169 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1170 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1171 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1172 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1173 }
1174 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1175 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1176 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1177 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1178 }
1179 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1180 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1181 fattr->pre_size = i_size_read(inode);
1182 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1183 }
1184out_noforce:
1185 status = nfs_post_op_update_inode_locked(inode, fattr);
1186 spin_unlock(&inode->i_lock);
1187 return status;
1188}
1189
1190/*
1191 * Many nfs protocol calls return the new file attributes after
1192 * an operation. Here we update the inode to reflect the state
1193 * of the server's inode.
1194 *
1195 * This is a bit tricky because we have to make sure all dirty pages
1196 * have been sent off to the server before calling invalidate_inode_pages.
1197 * To make sure no other process adds more write requests while we try
1198 * our best to flush them, we make them sleep during the attribute refresh.
1199 *
1200 * A very similar scenario holds for the dir cache.
1201 */
1202static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1203{
1204 struct nfs_server *server;
1205 struct nfs_inode *nfsi = NFS_I(inode);
1206 loff_t cur_isize, new_isize;
1207 unsigned long invalid = 0;
1208 unsigned long now = jiffies;
1209 unsigned long save_cache_validity;
1210
1211 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
1212 __func__, inode->i_sb->s_id, inode->i_ino,
1213 atomic_read(&inode->i_count), fattr->valid);
1214
1215 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1216 goto out_fileid;
1217
1218 /*
1219 * Make sure the inode's type hasn't changed.
1220 */
1221 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1222 goto out_changed;
1223
1224 server = NFS_SERVER(inode);
1225 /* Update the fsid? */
1226 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1227 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1228 !IS_AUTOMOUNT(inode))
1229 server->fsid = fattr->fsid;
1230
1231 /*
1232 * Update the read time so we don't revalidate too often.
1233 */
1234 nfsi->read_cache_jiffies = fattr->time_start;
1235
1236 save_cache_validity = nfsi->cache_validity;
1237 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1238 | NFS_INO_INVALID_ATIME
1239 | NFS_INO_REVAL_FORCED
1240 | NFS_INO_REVAL_PAGECACHE);
1241
1242 /* Do atomic weak cache consistency updates */
1243 invalid |= nfs_wcc_update_inode(inode, fattr);
1244
1245 /* More cache consistency checks */
1246 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1247 if (nfsi->change_attr != fattr->change_attr) {
1248 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1249 inode->i_sb->s_id, inode->i_ino);
1250 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1251 if (S_ISDIR(inode->i_mode))
1252 nfs_force_lookup_revalidate(inode);
1253 nfsi->change_attr = fattr->change_attr;
1254 }
1255 } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1256 invalid |= save_cache_validity;
1257
1258 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1259 /* NFSv2/v3: Check if the mtime agrees */
1260 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1261 dprintk("NFS: mtime change on server for file %s/%ld\n",
1262 inode->i_sb->s_id, inode->i_ino);
1263 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1264 if (S_ISDIR(inode->i_mode))
1265 nfs_force_lookup_revalidate(inode);
1266 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1267 }
1268 } else if (server->caps & NFS_CAP_MTIME)
1269 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1270 | NFS_INO_INVALID_DATA
1271 | NFS_INO_REVAL_PAGECACHE
1272 | NFS_INO_REVAL_FORCED);
1273
1274 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1275 /* If ctime has changed we should definitely clear access+acl caches */
1276 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
1277 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1278 /* and probably clear data for a directory too as utimes can cause
1279 * havoc with our cache.
1280 */
1281 if (S_ISDIR(inode->i_mode)) {
1282 invalid |= NFS_INO_INVALID_DATA;
1283 nfs_force_lookup_revalidate(inode);
1284 }
1285 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1286 }
1287 } else if (server->caps & NFS_CAP_CTIME)
1288 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1289 | NFS_INO_INVALID_ACCESS
1290 | NFS_INO_INVALID_ACL
1291 | NFS_INO_REVAL_FORCED);
1292
1293 /* Check if our cached file size is stale */
1294 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1295 new_isize = nfs_size_to_loff_t(fattr->size);
1296 cur_isize = i_size_read(inode);
1297 if (new_isize != cur_isize) {
1298 /* Do we perhaps have any outstanding writes, or has
1299 * the file grown beyond our last write? */
1300 if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) ||
1301 new_isize > cur_isize) {
1302 i_size_write(inode, new_isize);
1303 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1304 }
1305 dprintk("NFS: isize change on server for file %s/%ld "
1306 "(%Ld to %Ld)\n",
1307 inode->i_sb->s_id,
1308 inode->i_ino,
1309 (long long)cur_isize,
1310 (long long)new_isize);
1311 }
1312 } else
1313 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1314 | NFS_INO_REVAL_PAGECACHE
1315 | NFS_INO_REVAL_FORCED);
1316
1317
1318 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1319 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1320 else if (server->caps & NFS_CAP_ATIME)
1321 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME
1322 | NFS_INO_REVAL_FORCED);
1323
1324 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1325 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1326 umode_t newmode = inode->i_mode & S_IFMT;
1327 newmode |= fattr->mode & S_IALLUGO;
1328 inode->i_mode = newmode;
1329 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1330 }
1331 } else if (server->caps & NFS_CAP_MODE)
1332 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1333 | NFS_INO_INVALID_ACCESS
1334 | NFS_INO_INVALID_ACL
1335 | NFS_INO_REVAL_FORCED);
1336
1337 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1338 if (inode->i_uid != fattr->uid) {
1339 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1340 inode->i_uid = fattr->uid;
1341 }
1342 } else if (server->caps & NFS_CAP_OWNER)
1343 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1344 | NFS_INO_INVALID_ACCESS
1345 | NFS_INO_INVALID_ACL
1346 | NFS_INO_REVAL_FORCED);
1347
1348 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1349 if (inode->i_gid != fattr->gid) {
1350 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1351 inode->i_gid = fattr->gid;
1352 }
1353 } else if (server->caps & NFS_CAP_OWNER_GROUP)
1354 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1355 | NFS_INO_INVALID_ACCESS
1356 | NFS_INO_INVALID_ACL
1357 | NFS_INO_REVAL_FORCED);
1358
1359 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1360 if (inode->i_nlink != fattr->nlink) {
1361 invalid |= NFS_INO_INVALID_ATTR;
1362 if (S_ISDIR(inode->i_mode))
1363 invalid |= NFS_INO_INVALID_DATA;
1364 inode->i_nlink = fattr->nlink;
1365 }
1366 } else if (server->caps & NFS_CAP_NLINK)
1367 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1368 | NFS_INO_REVAL_FORCED);
1369
1370 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1371 /*
1372 * report the blocks in 512byte units
1373 */
1374 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1375 }
1376 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1377 inode->i_blocks = fattr->du.nfs2.blocks;
1378
1379 /* Update attrtimeo value if we're out of the unstable period */
1380 if (invalid & NFS_INO_INVALID_ATTR) {
1381 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1382 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1383 nfsi->attrtimeo_timestamp = now;
1384 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1385 } else {
1386 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1387 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1388 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1389 nfsi->attrtimeo_timestamp = now;
1390 }
1391 }
1392 invalid &= ~NFS_INO_INVALID_ATTR;
1393 /* Don't invalidate the data if we were to blame */
1394 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1395 || S_ISLNK(inode->i_mode)))
1396 invalid &= ~NFS_INO_INVALID_DATA;
1397 if (!nfs_have_delegation(inode, FMODE_READ) ||
1398 (save_cache_validity & NFS_INO_REVAL_FORCED))
1399 nfsi->cache_validity |= invalid;
1400
1401 return 0;
1402 out_changed:
1403 /*
1404 * Big trouble! The inode has become a different object.
1405 */
1406 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1407 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1408 out_err:
1409 /*
1410 * No need to worry about unhashing the dentry, as the
1411 * lookup validation will know that the inode is bad.
1412 * (But we fall through to invalidate the caches.)
1413 */
1414 nfs_invalidate_inode(inode);
1415 return -ESTALE;
1416
1417 out_fileid:
1418 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1419 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1420 NFS_SERVER(inode)->nfs_client->cl_hostname, inode->i_sb->s_id,
1421 (long long)nfsi->fileid, (long long)fattr->fileid);
1422 goto out_err;
1423}
1424
1425
1426#ifdef CONFIG_NFS_V4
1427
1428/*
1429 * Clean out any remaining NFSv4 state that might be left over due
1430 * to open() calls that passed nfs_atomic_lookup, but failed to call
1431 * nfs_open().
1432 */
1433void nfs4_evict_inode(struct inode *inode)
1434{
1435 truncate_inode_pages(&inode->i_data, 0);
1436 end_writeback(inode);
1437 pnfs_return_layout(inode);
1438 pnfs_destroy_layout(NFS_I(inode));
1439 /* If we are holding a delegation, return it! */
1440 nfs_inode_return_delegation_noreclaim(inode);
1441 /* First call standard NFS clear_inode() code */
1442 nfs_clear_inode(inode);
1443}
1444#endif
1445
1446struct inode *nfs_alloc_inode(struct super_block *sb)
1447{
1448 struct nfs_inode *nfsi;
1449 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1450 if (!nfsi)
1451 return NULL;
1452 nfsi->flags = 0UL;
1453 nfsi->cache_validity = 0UL;
1454#ifdef CONFIG_NFS_V3_ACL
1455 nfsi->acl_access = ERR_PTR(-EAGAIN);
1456 nfsi->acl_default = ERR_PTR(-EAGAIN);
1457#endif
1458#ifdef CONFIG_NFS_V4
1459 nfsi->nfs4_acl = NULL;
1460#endif /* CONFIG_NFS_V4 */
1461 return &nfsi->vfs_inode;
1462}
1463
1464static void nfs_i_callback(struct rcu_head *head)
1465{
1466 struct inode *inode = container_of(head, struct inode, i_rcu);
1467 INIT_LIST_HEAD(&inode->i_dentry);
1468 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1469}
1470
1471void nfs_destroy_inode(struct inode *inode)
1472{
1473 call_rcu(&inode->i_rcu, nfs_i_callback);
1474}
1475
1476static inline void nfs4_init_once(struct nfs_inode *nfsi)
1477{
1478#ifdef CONFIG_NFS_V4
1479 INIT_LIST_HEAD(&nfsi->open_states);
1480 nfsi->delegation = NULL;
1481 nfsi->delegation_state = 0;
1482 init_rwsem(&nfsi->rwsem);
1483 nfsi->layout = NULL;
1484 atomic_set(&nfsi->commits_outstanding, 0);
1485#endif
1486}
1487
1488static void init_once(void *foo)
1489{
1490 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1491
1492 inode_init_once(&nfsi->vfs_inode);
1493 INIT_LIST_HEAD(&nfsi->open_files);
1494 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1495 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1496 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
1497 nfsi->npages = 0;
1498 nfsi->ncommit = 0;
1499 atomic_set(&nfsi->silly_count, 1);
1500 INIT_HLIST_HEAD(&nfsi->silly_list);
1501 init_waitqueue_head(&nfsi->waitqueue);
1502 nfs4_init_once(nfsi);
1503}
1504
1505static int __init nfs_init_inodecache(void)
1506{
1507 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1508 sizeof(struct nfs_inode),
1509 0, (SLAB_RECLAIM_ACCOUNT|
1510 SLAB_MEM_SPREAD),
1511 init_once);
1512 if (nfs_inode_cachep == NULL)
1513 return -ENOMEM;
1514
1515 return 0;
1516}
1517
1518static void nfs_destroy_inodecache(void)
1519{
1520 kmem_cache_destroy(nfs_inode_cachep);
1521}
1522
1523struct workqueue_struct *nfsiod_workqueue;
1524
1525/*
1526 * start up the nfsiod workqueue
1527 */
1528static int nfsiod_start(void)
1529{
1530 struct workqueue_struct *wq;
1531 dprintk("RPC: creating workqueue nfsiod\n");
1532 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1533 if (wq == NULL)
1534 return -ENOMEM;
1535 nfsiod_workqueue = wq;
1536 return 0;
1537}
1538
1539/*
1540 * Destroy the nfsiod workqueue
1541 */
1542static void nfsiod_stop(void)
1543{
1544 struct workqueue_struct *wq;
1545
1546 wq = nfsiod_workqueue;
1547 if (wq == NULL)
1548 return;
1549 nfsiod_workqueue = NULL;
1550 destroy_workqueue(wq);
1551}
1552
1553/*
1554 * Initialize NFS
1555 */
1556static int __init init_nfs_fs(void)
1557{
1558 int err;
1559
1560 err = nfs_idmap_init();
1561 if (err < 0)
1562 goto out9;
1563
1564 err = nfs_dns_resolver_init();
1565 if (err < 0)
1566 goto out8;
1567
1568 err = nfs_fscache_register();
1569 if (err < 0)
1570 goto out7;
1571
1572 err = nfsiod_start();
1573 if (err)
1574 goto out6;
1575
1576 err = nfs_fs_proc_init();
1577 if (err)
1578 goto out5;
1579
1580 err = nfs_init_nfspagecache();
1581 if (err)
1582 goto out4;
1583
1584 err = nfs_init_inodecache();
1585 if (err)
1586 goto out3;
1587
1588 err = nfs_init_readpagecache();
1589 if (err)
1590 goto out2;
1591
1592 err = nfs_init_writepagecache();
1593 if (err)
1594 goto out1;
1595
1596 err = nfs_init_directcache();
1597 if (err)
1598 goto out0;
1599
1600#ifdef CONFIG_PROC_FS
1601 rpc_proc_register(&nfs_rpcstat);
1602#endif
1603 if ((err = register_nfs_fs()) != 0)
1604 goto out;
1605 return 0;
1606out:
1607#ifdef CONFIG_PROC_FS
1608 rpc_proc_unregister("nfs");
1609#endif
1610 nfs_destroy_directcache();
1611out0:
1612 nfs_destroy_writepagecache();
1613out1:
1614 nfs_destroy_readpagecache();
1615out2:
1616 nfs_destroy_inodecache();
1617out3:
1618 nfs_destroy_nfspagecache();
1619out4:
1620 nfs_fs_proc_exit();
1621out5:
1622 nfsiod_stop();
1623out6:
1624 nfs_fscache_unregister();
1625out7:
1626 nfs_dns_resolver_destroy();
1627out8:
1628 nfs_idmap_quit();
1629out9:
1630 return err;
1631}
1632
1633static void __exit exit_nfs_fs(void)
1634{
1635 nfs_destroy_directcache();
1636 nfs_destroy_writepagecache();
1637 nfs_destroy_readpagecache();
1638 nfs_destroy_inodecache();
1639 nfs_destroy_nfspagecache();
1640 nfs_fscache_unregister();
1641 nfs_dns_resolver_destroy();
1642 nfs_idmap_quit();
1643#ifdef CONFIG_PROC_FS
1644 rpc_proc_unregister("nfs");
1645#endif
1646 nfs_cleanup_cb_ident_idr();
1647 unregister_nfs_fs();
1648 nfs_fs_proc_exit();
1649 nfsiod_stop();
1650}
1651
1652/* Not quite true; I just maintain it */
1653MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1654MODULE_LICENSE("GPL");
1655module_param(enable_ino64, bool, 0644);
1656
1657module_init(init_nfs_fs)
1658module_exit(exit_nfs_fs)
1/*
2 * linux/fs/nfs/inode.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * nfs inode and superblock handling functions
7 *
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
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
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/sched.h>
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>
28#include <linux/sunrpc/metrics.h>
29#include <linux/nfs_fs.h>
30#include <linux/nfs_mount.h>
31#include <linux/nfs4_mount.h>
32#include <linux/lockd/bind.h>
33#include <linux/seq_file.h>
34#include <linux/mount.h>
35#include <linux/vfs.h>
36#include <linux/inet.h>
37#include <linux/nfs_xdr.h>
38#include <linux/slab.h>
39#include <linux/compat.h>
40#include <linux/freezer.h>
41
42#include <linux/uaccess.h>
43
44#include "nfs4_fs.h"
45#include "callback.h"
46#include "delegation.h"
47#include "iostat.h"
48#include "internal.h"
49#include "fscache.h"
50#include "pnfs.h"
51#include "nfs.h"
52#include "netns.h"
53
54#include "nfstrace.h"
55
56#define NFSDBG_FACILITY NFSDBG_VFS
57
58#define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
59
60/* Default is to see 64-bit inode numbers */
61static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
62
63static void nfs_invalidate_inode(struct inode *);
64static int nfs_update_inode(struct inode *, struct nfs_fattr *);
65
66static struct kmem_cache * nfs_inode_cachep;
67
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
74static int nfs_wait_killable(int mode)
75{
76 freezable_schedule_unsafe();
77 if (signal_pending_state(mode, current))
78 return -ERESTARTSYS;
79 return 0;
80}
81
82int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
83{
84 return nfs_wait_killable(mode);
85}
86EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
87
88int nfs_wait_atomic_killable(atomic_t *p)
89{
90 return nfs_wait_killable(TASK_KILLABLE);
91}
92
93/**
94 * nfs_compat_user_ino64 - returns the user-visible inode number
95 * @fileid: 64-bit fileid
96 *
97 * This function returns a 32-bit inode number if the boot parameter
98 * nfs.enable_ino64 is zero.
99 */
100u64 nfs_compat_user_ino64(u64 fileid)
101{
102#ifdef CONFIG_COMPAT
103 compat_ulong_t ino;
104#else
105 unsigned long ino;
106#endif
107
108 if (enable_ino64)
109 return fileid;
110 ino = fileid;
111 if (sizeof(ino) < sizeof(fileid))
112 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
113 return ino;
114}
115
116int nfs_drop_inode(struct inode *inode)
117{
118 return NFS_STALE(inode) || generic_drop_inode(inode);
119}
120EXPORT_SYMBOL_GPL(nfs_drop_inode);
121
122void nfs_clear_inode(struct inode *inode)
123{
124 /*
125 * The following should never happen...
126 */
127 WARN_ON_ONCE(nfs_have_writebacks(inode));
128 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
129 nfs_zap_acl_cache(inode);
130 nfs_access_zap_cache(inode);
131 nfs_fscache_clear_inode(inode);
132}
133EXPORT_SYMBOL_GPL(nfs_clear_inode);
134
135void nfs_evict_inode(struct inode *inode)
136{
137 truncate_inode_pages_final(&inode->i_data);
138 clear_inode(inode);
139 nfs_clear_inode(inode);
140}
141
142int nfs_sync_inode(struct inode *inode)
143{
144 inode_dio_wait(inode);
145 return nfs_wb_all(inode);
146}
147EXPORT_SYMBOL_GPL(nfs_sync_inode);
148
149/**
150 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
151 */
152int nfs_sync_mapping(struct address_space *mapping)
153{
154 int ret = 0;
155
156 if (mapping->nrpages != 0) {
157 unmap_mapping_range(mapping, 0, 0, 0);
158 ret = nfs_wb_all(mapping->host);
159 }
160 return ret;
161}
162
163static int nfs_attribute_timeout(struct inode *inode)
164{
165 struct nfs_inode *nfsi = NFS_I(inode);
166
167 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
168}
169
170static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
171{
172 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
173
174 /* Special case for the pagecache or access cache */
175 if (flags == NFS_INO_REVAL_PAGECACHE &&
176 !(cache_validity & NFS_INO_REVAL_FORCED))
177 return false;
178 return (cache_validity & flags) != 0;
179}
180
181static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
182{
183 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
184
185 if ((cache_validity & flags) != 0)
186 return true;
187 if (nfs_attribute_timeout(inode))
188 return true;
189 return false;
190}
191
192bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
193{
194 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
195 return nfs_check_cache_invalid_delegated(inode, flags);
196
197 return nfs_check_cache_invalid_not_delegated(inode, flags);
198}
199
200static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
201{
202 struct nfs_inode *nfsi = NFS_I(inode);
203
204 if (inode->i_mapping->nrpages == 0)
205 flags &= ~NFS_INO_INVALID_DATA;
206 nfsi->cache_validity |= flags;
207 if (flags & NFS_INO_INVALID_DATA)
208 nfs_fscache_invalidate(inode);
209}
210
211/*
212 * Invalidate the local caches
213 */
214static void nfs_zap_caches_locked(struct inode *inode)
215{
216 struct nfs_inode *nfsi = NFS_I(inode);
217 int mode = inode->i_mode;
218
219 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
220
221 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
222 nfsi->attrtimeo_timestamp = jiffies;
223
224 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
225 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
226 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
227 | NFS_INO_INVALID_DATA
228 | NFS_INO_INVALID_ACCESS
229 | NFS_INO_INVALID_ACL
230 | NFS_INO_REVAL_PAGECACHE);
231 } else
232 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
233 | NFS_INO_INVALID_ACCESS
234 | NFS_INO_INVALID_ACL
235 | NFS_INO_REVAL_PAGECACHE);
236 nfs_zap_label_cache_locked(nfsi);
237}
238
239void nfs_zap_caches(struct inode *inode)
240{
241 spin_lock(&inode->i_lock);
242 nfs_zap_caches_locked(inode);
243 spin_unlock(&inode->i_lock);
244}
245
246void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
247{
248 if (mapping->nrpages != 0) {
249 spin_lock(&inode->i_lock);
250 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
251 spin_unlock(&inode->i_lock);
252 }
253}
254
255void nfs_zap_acl_cache(struct inode *inode)
256{
257 void (*clear_acl_cache)(struct inode *);
258
259 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
260 if (clear_acl_cache != NULL)
261 clear_acl_cache(inode);
262 spin_lock(&inode->i_lock);
263 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
264 spin_unlock(&inode->i_lock);
265}
266EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
267
268void nfs_invalidate_atime(struct inode *inode)
269{
270 spin_lock(&inode->i_lock);
271 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
272 spin_unlock(&inode->i_lock);
273}
274EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
275
276/*
277 * Invalidate, but do not unhash, the inode.
278 * NB: must be called with inode->i_lock held!
279 */
280static void nfs_invalidate_inode(struct inode *inode)
281{
282 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
283 nfs_zap_caches_locked(inode);
284}
285
286struct nfs_find_desc {
287 struct nfs_fh *fh;
288 struct nfs_fattr *fattr;
289};
290
291/*
292 * In NFSv3 we can have 64bit inode numbers. In order to support
293 * this, and re-exported directories (also seen in NFSv2)
294 * we are forced to allow 2 different inodes to have the same
295 * i_ino.
296 */
297static int
298nfs_find_actor(struct inode *inode, void *opaque)
299{
300 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
301 struct nfs_fh *fh = desc->fh;
302 struct nfs_fattr *fattr = desc->fattr;
303
304 if (NFS_FILEID(inode) != fattr->fileid)
305 return 0;
306 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
307 return 0;
308 if (nfs_compare_fh(NFS_FH(inode), fh))
309 return 0;
310 if (is_bad_inode(inode) || NFS_STALE(inode))
311 return 0;
312 return 1;
313}
314
315static int
316nfs_init_locked(struct inode *inode, void *opaque)
317{
318 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
319 struct nfs_fattr *fattr = desc->fattr;
320
321 set_nfs_fileid(inode, fattr->fileid);
322 inode->i_mode = fattr->mode;
323 nfs_copy_fh(NFS_FH(inode), desc->fh);
324 return 0;
325}
326
327#ifdef CONFIG_NFS_V4_SECURITY_LABEL
328static void nfs_clear_label_invalid(struct inode *inode)
329{
330 spin_lock(&inode->i_lock);
331 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
332 spin_unlock(&inode->i_lock);
333}
334
335void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
336 struct nfs4_label *label)
337{
338 int error;
339
340 if (label == NULL)
341 return;
342
343 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
344 error = security_inode_notifysecctx(inode, label->label,
345 label->len);
346 if (error)
347 printk(KERN_ERR "%s() %s %d "
348 "security_inode_notifysecctx() %d\n",
349 __func__,
350 (char *)label->label,
351 label->len, error);
352 nfs_clear_label_invalid(inode);
353 }
354}
355
356struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
357{
358 struct nfs4_label *label = NULL;
359 int minor_version = server->nfs_client->cl_minorversion;
360
361 if (minor_version < 2)
362 return label;
363
364 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
365 return label;
366
367 label = kzalloc(sizeof(struct nfs4_label), flags);
368 if (label == NULL)
369 return ERR_PTR(-ENOMEM);
370
371 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
372 if (label->label == NULL) {
373 kfree(label);
374 return ERR_PTR(-ENOMEM);
375 }
376 label->len = NFS4_MAXLABELLEN;
377
378 return label;
379}
380EXPORT_SYMBOL_GPL(nfs4_label_alloc);
381#else
382void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
383 struct nfs4_label *label)
384{
385}
386#endif
387EXPORT_SYMBOL_GPL(nfs_setsecurity);
388
389/*
390 * This is our front-end to iget that looks up inodes by file handle
391 * instead of inode number.
392 */
393struct inode *
394nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
395{
396 struct nfs_find_desc desc = {
397 .fh = fh,
398 .fattr = fattr
399 };
400 struct inode *inode = ERR_PTR(-ENOENT);
401 unsigned long hash;
402
403 nfs_attr_check_mountpoint(sb, fattr);
404
405 if (nfs_attr_use_mounted_on_fileid(fattr))
406 fattr->fileid = fattr->mounted_on_fileid;
407 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
408 goto out_no_inode;
409 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
410 goto out_no_inode;
411
412 hash = nfs_fattr_to_ino_t(fattr);
413
414 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
415 if (inode == NULL) {
416 inode = ERR_PTR(-ENOMEM);
417 goto out_no_inode;
418 }
419
420 if (inode->i_state & I_NEW) {
421 struct nfs_inode *nfsi = NFS_I(inode);
422 unsigned long now = jiffies;
423
424 /* We set i_ino for the few things that still rely on it,
425 * such as stat(2) */
426 inode->i_ino = hash;
427
428 /* We can't support update_atime(), since the server will reset it */
429 inode->i_flags |= S_NOATIME|S_NOCMTIME;
430 inode->i_mode = fattr->mode;
431 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
432 && nfs_server_capable(inode, NFS_CAP_MODE))
433 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
434 /* Why so? Because we want revalidate for devices/FIFOs, and
435 * that's precisely what we have in nfs_file_inode_operations.
436 */
437 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
438 if (S_ISREG(inode->i_mode)) {
439 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
440 inode->i_data.a_ops = &nfs_file_aops;
441 } else if (S_ISDIR(inode->i_mode)) {
442 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
443 inode->i_fop = &nfs_dir_operations;
444 inode->i_data.a_ops = &nfs_dir_aops;
445 /* Deal with crossing mountpoints */
446 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
447 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
448 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
449 inode->i_op = &nfs_referral_inode_operations;
450 else
451 inode->i_op = &nfs_mountpoint_inode_operations;
452 inode->i_fop = NULL;
453 inode->i_flags |= S_AUTOMOUNT;
454 }
455 } else if (S_ISLNK(inode->i_mode)) {
456 inode->i_op = &nfs_symlink_inode_operations;
457 inode_nohighmem(inode);
458 } else
459 init_special_inode(inode, inode->i_mode, fattr->rdev);
460
461 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
462 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
463 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
464 inode->i_version = 0;
465 inode->i_size = 0;
466 clear_nlink(inode);
467 inode->i_uid = make_kuid(&init_user_ns, -2);
468 inode->i_gid = make_kgid(&init_user_ns, -2);
469 inode->i_blocks = 0;
470 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
471 nfsi->write_io = 0;
472 nfsi->read_io = 0;
473
474 nfsi->read_cache_jiffies = fattr->time_start;
475 nfsi->attr_gencount = fattr->gencount;
476 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
477 inode->i_atime = fattr->atime;
478 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
479 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
480 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
481 inode->i_mtime = fattr->mtime;
482 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
483 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
484 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
485 inode->i_ctime = fattr->ctime;
486 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
487 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
488 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
489 inode->i_version = fattr->change_attr;
490 else
491 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
492 | NFS_INO_REVAL_PAGECACHE);
493 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
494 inode->i_size = nfs_size_to_loff_t(fattr->size);
495 else
496 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
497 | NFS_INO_REVAL_PAGECACHE);
498 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
499 set_nlink(inode, fattr->nlink);
500 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
501 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
502 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
503 inode->i_uid = fattr->uid;
504 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
505 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
506 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
507 inode->i_gid = fattr->gid;
508 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
509 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
510 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
511 inode->i_blocks = fattr->du.nfs2.blocks;
512 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
513 /*
514 * report the blocks in 512byte units
515 */
516 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
517 }
518
519 nfs_setsecurity(inode, fattr, label);
520
521 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
522 nfsi->attrtimeo_timestamp = now;
523 nfsi->access_cache = RB_ROOT;
524
525 nfs_fscache_init_inode(inode);
526
527 unlock_new_inode(inode);
528 } else
529 nfs_refresh_inode(inode, fattr);
530 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
531 inode->i_sb->s_id,
532 (unsigned long long)NFS_FILEID(inode),
533 nfs_display_fhandle_hash(fh),
534 atomic_read(&inode->i_count));
535
536out:
537 return inode;
538
539out_no_inode:
540 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
541 goto out;
542}
543EXPORT_SYMBOL_GPL(nfs_fhget);
544
545#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN)
546
547int
548nfs_setattr(struct dentry *dentry, struct iattr *attr)
549{
550 struct inode *inode = d_inode(dentry);
551 struct nfs_fattr *fattr;
552 int error = 0;
553
554 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
555
556 /* skip mode change if it's just for clearing setuid/setgid */
557 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
558 attr->ia_valid &= ~ATTR_MODE;
559
560 if (attr->ia_valid & ATTR_SIZE) {
561 BUG_ON(!S_ISREG(inode->i_mode));
562
563 error = inode_newsize_ok(inode, attr->ia_size);
564 if (error)
565 return error;
566
567 if (attr->ia_size == i_size_read(inode))
568 attr->ia_valid &= ~ATTR_SIZE;
569 }
570
571 /* Optimization: if the end result is no change, don't RPC */
572 attr->ia_valid &= NFS_VALID_ATTRS;
573 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
574 return 0;
575
576 trace_nfs_setattr_enter(inode);
577
578 /* Write all dirty data */
579 if (S_ISREG(inode->i_mode))
580 nfs_sync_inode(inode);
581
582 fattr = nfs_alloc_fattr();
583 if (fattr == NULL) {
584 error = -ENOMEM;
585 goto out;
586 }
587
588 /*
589 * Return any delegations if we're going to change ACLs
590 */
591 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
592 NFS_PROTO(inode)->return_delegation(inode);
593 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
594 if (error == 0)
595 error = nfs_refresh_inode(inode, fattr);
596 nfs_free_fattr(fattr);
597out:
598 trace_nfs_setattr_exit(inode, error);
599 return error;
600}
601EXPORT_SYMBOL_GPL(nfs_setattr);
602
603/**
604 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
605 * @inode: inode of the file used
606 * @offset: file offset to start truncating
607 *
608 * This is a copy of the common vmtruncate, but with the locking
609 * corrected to take into account the fact that NFS requires
610 * inode->i_size to be updated under the inode->i_lock.
611 * Note: must be called with inode->i_lock held!
612 */
613static int nfs_vmtruncate(struct inode * inode, loff_t offset)
614{
615 int err;
616
617 err = inode_newsize_ok(inode, offset);
618 if (err)
619 goto out;
620
621 i_size_write(inode, offset);
622 /* Optimisation */
623 if (offset == 0)
624 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
625
626 spin_unlock(&inode->i_lock);
627 truncate_pagecache(inode, offset);
628 spin_lock(&inode->i_lock);
629out:
630 return err;
631}
632
633/**
634 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
635 * @inode: pointer to struct inode
636 * @attr: pointer to struct iattr
637 *
638 * Note: we do this in the *proc.c in order to ensure that
639 * it works for things like exclusive creates too.
640 */
641void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
642 struct nfs_fattr *fattr)
643{
644 /* Barrier: bump the attribute generation count. */
645 nfs_fattr_set_barrier(fattr);
646
647 spin_lock(&inode->i_lock);
648 NFS_I(inode)->attr_gencount = fattr->gencount;
649 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
650 if ((attr->ia_valid & ATTR_MODE) != 0) {
651 int mode = attr->ia_mode & S_IALLUGO;
652 mode |= inode->i_mode & ~S_IALLUGO;
653 inode->i_mode = mode;
654 }
655 if ((attr->ia_valid & ATTR_UID) != 0)
656 inode->i_uid = attr->ia_uid;
657 if ((attr->ia_valid & ATTR_GID) != 0)
658 inode->i_gid = attr->ia_gid;
659 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
660 | NFS_INO_INVALID_ACL);
661 }
662 if ((attr->ia_valid & ATTR_SIZE) != 0) {
663 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
664 nfs_vmtruncate(inode, attr->ia_size);
665 }
666 if (fattr->valid)
667 nfs_update_inode(inode, fattr);
668 else
669 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
670 spin_unlock(&inode->i_lock);
671}
672EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
673
674static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
675{
676 struct dentry *parent;
677
678 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
679 return;
680 parent = dget_parent(dentry);
681 nfs_force_use_readdirplus(d_inode(parent));
682 dput(parent);
683}
684
685static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
686{
687 struct dentry *parent;
688
689 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
690 return;
691 parent = dget_parent(dentry);
692 nfs_advise_use_readdirplus(d_inode(parent));
693 dput(parent);
694}
695
696static bool nfs_need_revalidate_inode(struct inode *inode)
697{
698 if (NFS_I(inode)->cache_validity &
699 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
700 return true;
701 if (nfs_attribute_cache_expired(inode))
702 return true;
703 return false;
704}
705
706int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
707{
708 struct inode *inode = d_inode(dentry);
709 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
710 int err = 0;
711
712 trace_nfs_getattr_enter(inode);
713 /* Flush out writes to the server in order to update c/mtime. */
714 if (S_ISREG(inode->i_mode)) {
715 err = filemap_write_and_wait(inode->i_mapping);
716 if (err)
717 goto out;
718 }
719
720 /*
721 * We may force a getattr if the user cares about atime.
722 *
723 * Note that we only have to check the vfsmount flags here:
724 * - NFS always sets S_NOATIME by so checking it would give a
725 * bogus result
726 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
727 * no point in checking those.
728 */
729 if ((mnt->mnt_flags & MNT_NOATIME) ||
730 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
731 need_atime = 0;
732
733 if (need_atime || nfs_need_revalidate_inode(inode)) {
734 struct nfs_server *server = NFS_SERVER(inode);
735
736 nfs_readdirplus_parent_cache_miss(dentry);
737 err = __nfs_revalidate_inode(server, inode);
738 } else
739 nfs_readdirplus_parent_cache_hit(dentry);
740 if (!err) {
741 generic_fillattr(inode, stat);
742 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
743 if (S_ISDIR(inode->i_mode))
744 stat->blksize = NFS_SERVER(inode)->dtsize;
745 }
746out:
747 trace_nfs_getattr_exit(inode, err);
748 return err;
749}
750EXPORT_SYMBOL_GPL(nfs_getattr);
751
752static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
753{
754 atomic_set(&l_ctx->count, 1);
755 l_ctx->lockowner = current->files;
756 INIT_LIST_HEAD(&l_ctx->list);
757 atomic_set(&l_ctx->io_count, 0);
758}
759
760static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
761{
762 struct nfs_lock_context *head = &ctx->lock_context;
763 struct nfs_lock_context *pos = head;
764
765 do {
766 if (pos->lockowner != current->files)
767 continue;
768 atomic_inc(&pos->count);
769 return pos;
770 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
771 return NULL;
772}
773
774struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
775{
776 struct nfs_lock_context *res, *new = NULL;
777 struct inode *inode = d_inode(ctx->dentry);
778
779 spin_lock(&inode->i_lock);
780 res = __nfs_find_lock_context(ctx);
781 if (res == NULL) {
782 spin_unlock(&inode->i_lock);
783 new = kmalloc(sizeof(*new), GFP_KERNEL);
784 if (new == NULL)
785 return ERR_PTR(-ENOMEM);
786 nfs_init_lock_context(new);
787 spin_lock(&inode->i_lock);
788 res = __nfs_find_lock_context(ctx);
789 if (res == NULL) {
790 list_add_tail(&new->list, &ctx->lock_context.list);
791 new->open_context = ctx;
792 res = new;
793 new = NULL;
794 }
795 }
796 spin_unlock(&inode->i_lock);
797 kfree(new);
798 return res;
799}
800EXPORT_SYMBOL_GPL(nfs_get_lock_context);
801
802void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
803{
804 struct nfs_open_context *ctx = l_ctx->open_context;
805 struct inode *inode = d_inode(ctx->dentry);
806
807 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
808 return;
809 list_del(&l_ctx->list);
810 spin_unlock(&inode->i_lock);
811 kfree(l_ctx);
812}
813EXPORT_SYMBOL_GPL(nfs_put_lock_context);
814
815/**
816 * nfs_close_context - Common close_context() routine NFSv2/v3
817 * @ctx: pointer to context
818 * @is_sync: is this a synchronous close
819 *
820 * Ensure that the attributes are up to date if we're mounted
821 * with close-to-open semantics and we have cached data that will
822 * need to be revalidated on open.
823 */
824void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
825{
826 struct nfs_inode *nfsi;
827 struct inode *inode;
828 struct nfs_server *server;
829
830 if (!(ctx->mode & FMODE_WRITE))
831 return;
832 if (!is_sync)
833 return;
834 inode = d_inode(ctx->dentry);
835 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
836 return;
837 nfsi = NFS_I(inode);
838 if (inode->i_mapping->nrpages == 0)
839 return;
840 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
841 return;
842 if (!list_empty(&nfsi->open_files))
843 return;
844 server = NFS_SERVER(inode);
845 if (server->flags & NFS_MOUNT_NOCTO)
846 return;
847 nfs_revalidate_inode(server, inode);
848}
849EXPORT_SYMBOL_GPL(nfs_close_context);
850
851struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
852 fmode_t f_mode,
853 struct file *filp)
854{
855 struct nfs_open_context *ctx;
856 struct rpc_cred *cred = rpc_lookup_cred();
857 if (IS_ERR(cred))
858 return ERR_CAST(cred);
859
860 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
861 if (!ctx) {
862 put_rpccred(cred);
863 return ERR_PTR(-ENOMEM);
864 }
865 nfs_sb_active(dentry->d_sb);
866 ctx->dentry = dget(dentry);
867 ctx->cred = cred;
868 ctx->state = NULL;
869 ctx->mode = f_mode;
870 ctx->flags = 0;
871 ctx->error = 0;
872 ctx->flock_owner = (fl_owner_t)filp;
873 nfs_init_lock_context(&ctx->lock_context);
874 ctx->lock_context.open_context = ctx;
875 INIT_LIST_HEAD(&ctx->list);
876 ctx->mdsthreshold = NULL;
877 return ctx;
878}
879EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
880
881struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
882{
883 if (ctx != NULL)
884 atomic_inc(&ctx->lock_context.count);
885 return ctx;
886}
887EXPORT_SYMBOL_GPL(get_nfs_open_context);
888
889static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
890{
891 struct inode *inode = d_inode(ctx->dentry);
892 struct super_block *sb = ctx->dentry->d_sb;
893
894 if (!list_empty(&ctx->list)) {
895 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
896 return;
897 list_del(&ctx->list);
898 spin_unlock(&inode->i_lock);
899 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
900 return;
901 if (inode != NULL)
902 NFS_PROTO(inode)->close_context(ctx, is_sync);
903 if (ctx->cred != NULL)
904 put_rpccred(ctx->cred);
905 dput(ctx->dentry);
906 nfs_sb_deactive(sb);
907 kfree(ctx->mdsthreshold);
908 kfree(ctx);
909}
910
911void put_nfs_open_context(struct nfs_open_context *ctx)
912{
913 __put_nfs_open_context(ctx, 0);
914}
915EXPORT_SYMBOL_GPL(put_nfs_open_context);
916
917static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
918{
919 __put_nfs_open_context(ctx, 1);
920}
921
922/*
923 * Ensure that mmap has a recent RPC credential for use when writing out
924 * shared pages
925 */
926void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
927{
928 struct inode *inode = d_inode(ctx->dentry);
929 struct nfs_inode *nfsi = NFS_I(inode);
930
931 spin_lock(&inode->i_lock);
932 if (ctx->mode & FMODE_WRITE)
933 list_add(&ctx->list, &nfsi->open_files);
934 else
935 list_add_tail(&ctx->list, &nfsi->open_files);
936 spin_unlock(&inode->i_lock);
937}
938EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
939
940void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
941{
942 filp->private_data = get_nfs_open_context(ctx);
943 if (list_empty(&ctx->list))
944 nfs_inode_attach_open_context(ctx);
945}
946EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
947
948/*
949 * Given an inode, search for an open context with the desired characteristics
950 */
951struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
952{
953 struct nfs_inode *nfsi = NFS_I(inode);
954 struct nfs_open_context *pos, *ctx = NULL;
955
956 spin_lock(&inode->i_lock);
957 list_for_each_entry(pos, &nfsi->open_files, list) {
958 if (cred != NULL && pos->cred != cred)
959 continue;
960 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
961 continue;
962 ctx = get_nfs_open_context(pos);
963 break;
964 }
965 spin_unlock(&inode->i_lock);
966 return ctx;
967}
968
969void nfs_file_clear_open_context(struct file *filp)
970{
971 struct nfs_open_context *ctx = nfs_file_open_context(filp);
972
973 if (ctx) {
974 struct inode *inode = d_inode(ctx->dentry);
975
976 /*
977 * We fatal error on write before. Try to writeback
978 * every page again.
979 */
980 if (ctx->error < 0)
981 invalidate_inode_pages2(inode->i_mapping);
982 filp->private_data = NULL;
983 spin_lock(&inode->i_lock);
984 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
985 spin_unlock(&inode->i_lock);
986 put_nfs_open_context_sync(ctx);
987 }
988}
989
990/*
991 * These allocate and release file read/write context information.
992 */
993int nfs_open(struct inode *inode, struct file *filp)
994{
995 struct nfs_open_context *ctx;
996
997 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
998 if (IS_ERR(ctx))
999 return PTR_ERR(ctx);
1000 nfs_file_set_open_context(filp, ctx);
1001 put_nfs_open_context(ctx);
1002 nfs_fscache_open_file(inode, filp);
1003 return 0;
1004}
1005
1006/*
1007 * This function is called whenever some part of NFS notices that
1008 * the cached attributes have to be refreshed.
1009 */
1010int
1011__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1012{
1013 int status = -ESTALE;
1014 struct nfs4_label *label = NULL;
1015 struct nfs_fattr *fattr = NULL;
1016 struct nfs_inode *nfsi = NFS_I(inode);
1017
1018 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1019 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1020
1021 trace_nfs_revalidate_inode_enter(inode);
1022
1023 if (is_bad_inode(inode))
1024 goto out;
1025 if (NFS_STALE(inode))
1026 goto out;
1027
1028 /* pNFS: Attributes aren't updated until we layoutcommit */
1029 if (S_ISREG(inode->i_mode)) {
1030 status = pnfs_sync_inode(inode, false);
1031 if (status)
1032 goto out;
1033 }
1034
1035 status = -ENOMEM;
1036 fattr = nfs_alloc_fattr();
1037 if (fattr == NULL)
1038 goto out;
1039
1040 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1041
1042 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1043 if (IS_ERR(label)) {
1044 status = PTR_ERR(label);
1045 goto out;
1046 }
1047
1048 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
1049 if (status != 0) {
1050 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1051 inode->i_sb->s_id,
1052 (unsigned long long)NFS_FILEID(inode), status);
1053 if (status == -ESTALE) {
1054 nfs_zap_caches(inode);
1055 if (!S_ISDIR(inode->i_mode))
1056 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1057 }
1058 goto err_out;
1059 }
1060
1061 status = nfs_refresh_inode(inode, fattr);
1062 if (status) {
1063 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1064 inode->i_sb->s_id,
1065 (unsigned long long)NFS_FILEID(inode), status);
1066 goto err_out;
1067 }
1068
1069 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1070 nfs_zap_acl_cache(inode);
1071
1072 nfs_setsecurity(inode, fattr, label);
1073
1074 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1075 inode->i_sb->s_id,
1076 (unsigned long long)NFS_FILEID(inode));
1077
1078err_out:
1079 nfs4_label_free(label);
1080out:
1081 nfs_free_fattr(fattr);
1082 trace_nfs_revalidate_inode_exit(inode, status);
1083 return status;
1084}
1085
1086int nfs_attribute_cache_expired(struct inode *inode)
1087{
1088 if (nfs_have_delegated_attributes(inode))
1089 return 0;
1090 return nfs_attribute_timeout(inode);
1091}
1092
1093/**
1094 * nfs_revalidate_inode - Revalidate the inode attributes
1095 * @server - pointer to nfs_server struct
1096 * @inode - pointer to inode struct
1097 *
1098 * Updates inode attribute information by retrieving the data from the server.
1099 */
1100int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1101{
1102 if (!nfs_need_revalidate_inode(inode))
1103 return NFS_STALE(inode) ? -ESTALE : 0;
1104 return __nfs_revalidate_inode(server, inode);
1105}
1106EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1107
1108static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1109{
1110 struct nfs_inode *nfsi = NFS_I(inode);
1111 int ret;
1112
1113 if (mapping->nrpages != 0) {
1114 if (S_ISREG(inode->i_mode)) {
1115 unmap_mapping_range(mapping, 0, 0, 0);
1116 ret = nfs_sync_mapping(mapping);
1117 if (ret < 0)
1118 return ret;
1119 }
1120 ret = invalidate_inode_pages2(mapping);
1121 if (ret < 0)
1122 return ret;
1123 }
1124 if (S_ISDIR(inode->i_mode)) {
1125 spin_lock(&inode->i_lock);
1126 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1127 spin_unlock(&inode->i_lock);
1128 }
1129 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1130 nfs_fscache_wait_on_invalidate(inode);
1131
1132 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1133 inode->i_sb->s_id,
1134 (unsigned long long)NFS_FILEID(inode));
1135 return 0;
1136}
1137
1138bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1139{
1140 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1141 NFS_STALE(inode);
1142}
1143
1144int nfs_revalidate_mapping_rcu(struct inode *inode)
1145{
1146 struct nfs_inode *nfsi = NFS_I(inode);
1147 unsigned long *bitlock = &nfsi->flags;
1148 int ret = 0;
1149
1150 if (IS_SWAPFILE(inode))
1151 goto out;
1152 if (nfs_mapping_need_revalidate_inode(inode)) {
1153 ret = -ECHILD;
1154 goto out;
1155 }
1156 spin_lock(&inode->i_lock);
1157 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1158 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1159 ret = -ECHILD;
1160 spin_unlock(&inode->i_lock);
1161out:
1162 return ret;
1163}
1164
1165/**
1166 * nfs_revalidate_mapping - Revalidate the pagecache
1167 * @inode - pointer to host inode
1168 * @mapping - pointer to mapping
1169 */
1170int nfs_revalidate_mapping(struct inode *inode,
1171 struct address_space *mapping)
1172{
1173 struct nfs_inode *nfsi = NFS_I(inode);
1174 unsigned long *bitlock = &nfsi->flags;
1175 int ret = 0;
1176
1177 /* swapfiles are not supposed to be shared. */
1178 if (IS_SWAPFILE(inode))
1179 goto out;
1180
1181 if (nfs_mapping_need_revalidate_inode(inode)) {
1182 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1183 if (ret < 0)
1184 goto out;
1185 }
1186
1187 /*
1188 * We must clear NFS_INO_INVALID_DATA first to ensure that
1189 * invalidations that come in while we're shooting down the mappings
1190 * are respected. But, that leaves a race window where one revalidator
1191 * can clear the flag, and then another checks it before the mapping
1192 * gets invalidated. Fix that by serializing access to this part of
1193 * the function.
1194 *
1195 * At the same time, we need to allow other tasks to see whether we
1196 * might be in the middle of invalidating the pages, so we only set
1197 * the bit lock here if it looks like we're going to be doing that.
1198 */
1199 for (;;) {
1200 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1201 nfs_wait_bit_killable, TASK_KILLABLE);
1202 if (ret)
1203 goto out;
1204 spin_lock(&inode->i_lock);
1205 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1206 spin_unlock(&inode->i_lock);
1207 continue;
1208 }
1209 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1210 break;
1211 spin_unlock(&inode->i_lock);
1212 goto out;
1213 }
1214
1215 set_bit(NFS_INO_INVALIDATING, bitlock);
1216 smp_wmb();
1217 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1218 spin_unlock(&inode->i_lock);
1219 trace_nfs_invalidate_mapping_enter(inode);
1220 ret = nfs_invalidate_mapping(inode, mapping);
1221 trace_nfs_invalidate_mapping_exit(inode, ret);
1222
1223 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1224 smp_mb__after_atomic();
1225 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1226out:
1227 return ret;
1228}
1229
1230static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1231{
1232 struct inode *inode = &nfsi->vfs_inode;
1233
1234 assert_spin_locked(&inode->i_lock);
1235
1236 if (!S_ISREG(inode->i_mode))
1237 return false;
1238 if (list_empty(&nfsi->open_files))
1239 return false;
1240 /* Note: This relies on nfsi->open_files being ordered with writers
1241 * being placed at the head of the list.
1242 * See nfs_inode_attach_open_context()
1243 */
1244 return (list_first_entry(&nfsi->open_files,
1245 struct nfs_open_context,
1246 list)->mode & FMODE_WRITE) == FMODE_WRITE;
1247}
1248
1249static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1250{
1251 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1252}
1253
1254static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1255{
1256 struct nfs_inode *nfsi = NFS_I(inode);
1257 unsigned long ret = 0;
1258
1259 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1260 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1261 && inode->i_version == fattr->pre_change_attr) {
1262 inode->i_version = fattr->change_attr;
1263 if (S_ISDIR(inode->i_mode))
1264 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1265 ret |= NFS_INO_INVALID_ATTR;
1266 }
1267 /* If we have atomic WCC data, we may update some attributes */
1268 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1269 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1270 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1271 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1272 ret |= NFS_INO_INVALID_ATTR;
1273 }
1274
1275 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1276 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1277 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1278 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1279 if (S_ISDIR(inode->i_mode))
1280 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1281 ret |= NFS_INO_INVALID_ATTR;
1282 }
1283 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1284 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1285 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1286 && nfsi->nrequests == 0) {
1287 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1288 ret |= NFS_INO_INVALID_ATTR;
1289 }
1290
1291 return ret;
1292}
1293
1294/**
1295 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1296 * @inode - pointer to inode
1297 * @fattr - updated attributes
1298 *
1299 * Verifies the attribute cache. If we have just changed the attributes,
1300 * so that fattr carries weak cache consistency data, then it may
1301 * also update the ctime/mtime/change_attribute.
1302 */
1303static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1304{
1305 struct nfs_inode *nfsi = NFS_I(inode);
1306 loff_t cur_size, new_isize;
1307 unsigned long invalid = 0;
1308
1309
1310 if (nfs_have_delegated_attributes(inode))
1311 return 0;
1312 /* Has the inode gone and changed behind our back? */
1313 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1314 return -EIO;
1315 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1316 return -EIO;
1317
1318 if (!nfs_file_has_buffered_writers(nfsi)) {
1319 /* Verify a few of the more important attributes */
1320 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && inode->i_version != fattr->change_attr)
1321 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_REVAL_PAGECACHE;
1322
1323 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1324 invalid |= NFS_INO_INVALID_ATTR;
1325
1326 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&inode->i_ctime, &fattr->ctime))
1327 invalid |= NFS_INO_INVALID_ATTR;
1328
1329 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1330 cur_size = i_size_read(inode);
1331 new_isize = nfs_size_to_loff_t(fattr->size);
1332 if (cur_size != new_isize)
1333 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1334 }
1335 }
1336
1337 /* Have any file permissions changed? */
1338 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1339 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1340 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1341 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1342 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1343 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1344
1345 /* Has the link count changed? */
1346 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1347 invalid |= NFS_INO_INVALID_ATTR;
1348
1349 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1350 invalid |= NFS_INO_INVALID_ATIME;
1351
1352 if (invalid != 0)
1353 nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED);
1354
1355 nfsi->read_cache_jiffies = fattr->time_start;
1356 return 0;
1357}
1358
1359static atomic_long_t nfs_attr_generation_counter;
1360
1361static unsigned long nfs_read_attr_generation_counter(void)
1362{
1363 return atomic_long_read(&nfs_attr_generation_counter);
1364}
1365
1366unsigned long nfs_inc_attr_generation_counter(void)
1367{
1368 return atomic_long_inc_return(&nfs_attr_generation_counter);
1369}
1370EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1371
1372void nfs_fattr_init(struct nfs_fattr *fattr)
1373{
1374 fattr->valid = 0;
1375 fattr->time_start = jiffies;
1376 fattr->gencount = nfs_inc_attr_generation_counter();
1377 fattr->owner_name = NULL;
1378 fattr->group_name = NULL;
1379}
1380EXPORT_SYMBOL_GPL(nfs_fattr_init);
1381
1382/**
1383 * nfs_fattr_set_barrier
1384 * @fattr: attributes
1385 *
1386 * Used to set a barrier after an attribute was updated. This
1387 * barrier ensures that older attributes from RPC calls that may
1388 * have raced with our update cannot clobber these new values.
1389 * Note that you are still responsible for ensuring that other
1390 * operations which change the attribute on the server do not
1391 * collide.
1392 */
1393void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1394{
1395 fattr->gencount = nfs_inc_attr_generation_counter();
1396}
1397
1398struct nfs_fattr *nfs_alloc_fattr(void)
1399{
1400 struct nfs_fattr *fattr;
1401
1402 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1403 if (fattr != NULL)
1404 nfs_fattr_init(fattr);
1405 return fattr;
1406}
1407EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1408
1409struct nfs_fh *nfs_alloc_fhandle(void)
1410{
1411 struct nfs_fh *fh;
1412
1413 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1414 if (fh != NULL)
1415 fh->size = 0;
1416 return fh;
1417}
1418EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1419
1420#ifdef NFS_DEBUG
1421/*
1422 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1423 * in the same way that wireshark does
1424 *
1425 * @fh: file handle
1426 *
1427 * For debugging only.
1428 */
1429u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1430{
1431 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1432 * not on the result */
1433 return nfs_fhandle_hash(fh);
1434}
1435EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1436
1437/*
1438 * _nfs_display_fhandle - display an NFS file handle on the console
1439 *
1440 * @fh: file handle to display
1441 * @caption: display caption
1442 *
1443 * For debugging only.
1444 */
1445void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1446{
1447 unsigned short i;
1448
1449 if (fh == NULL || fh->size == 0) {
1450 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1451 return;
1452 }
1453
1454 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1455 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1456 for (i = 0; i < fh->size; i += 16) {
1457 __be32 *pos = (__be32 *)&fh->data[i];
1458
1459 switch ((fh->size - i - 1) >> 2) {
1460 case 0:
1461 printk(KERN_DEFAULT " %08x\n",
1462 be32_to_cpup(pos));
1463 break;
1464 case 1:
1465 printk(KERN_DEFAULT " %08x %08x\n",
1466 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1467 break;
1468 case 2:
1469 printk(KERN_DEFAULT " %08x %08x %08x\n",
1470 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1471 be32_to_cpup(pos + 2));
1472 break;
1473 default:
1474 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1475 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1476 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1477 }
1478 }
1479}
1480EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1481#endif
1482
1483/**
1484 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1485 * @inode - pointer to inode
1486 * @fattr - attributes
1487 *
1488 * Attempt to divine whether or not an RPC call reply carrying stale
1489 * attributes got scheduled after another call carrying updated ones.
1490 *
1491 * To do so, the function first assumes that a more recent ctime means
1492 * that the attributes in fattr are newer, however it also attempt to
1493 * catch the case where ctime either didn't change, or went backwards
1494 * (if someone reset the clock on the server) by looking at whether
1495 * or not this RPC call was started after the inode was last updated.
1496 * Note also the check for wraparound of 'attr_gencount'
1497 *
1498 * The function returns 'true' if it thinks the attributes in 'fattr' are
1499 * more recent than the ones cached in the inode.
1500 *
1501 */
1502static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1503{
1504 const struct nfs_inode *nfsi = NFS_I(inode);
1505
1506 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1507 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1508}
1509
1510static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1511{
1512 int ret;
1513
1514 trace_nfs_refresh_inode_enter(inode);
1515
1516 if (nfs_inode_attrs_need_update(inode, fattr))
1517 ret = nfs_update_inode(inode, fattr);
1518 else
1519 ret = nfs_check_inode_attributes(inode, fattr);
1520
1521 trace_nfs_refresh_inode_exit(inode, ret);
1522 return ret;
1523}
1524
1525/**
1526 * nfs_refresh_inode - try to update the inode attribute cache
1527 * @inode - pointer to inode
1528 * @fattr - updated attributes
1529 *
1530 * Check that an RPC call that returned attributes has not overlapped with
1531 * other recent updates of the inode metadata, then decide whether it is
1532 * safe to do a full update of the inode attributes, or whether just to
1533 * call nfs_check_inode_attributes.
1534 */
1535int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1536{
1537 int status;
1538
1539 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1540 return 0;
1541 spin_lock(&inode->i_lock);
1542 status = nfs_refresh_inode_locked(inode, fattr);
1543 spin_unlock(&inode->i_lock);
1544
1545 return status;
1546}
1547EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1548
1549static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1550{
1551 unsigned long invalid = NFS_INO_INVALID_ATTR;
1552
1553 if (S_ISDIR(inode->i_mode))
1554 invalid |= NFS_INO_INVALID_DATA;
1555 nfs_set_cache_invalid(inode, invalid);
1556 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1557 return 0;
1558 return nfs_refresh_inode_locked(inode, fattr);
1559}
1560
1561/**
1562 * nfs_post_op_update_inode - try to update the inode attribute cache
1563 * @inode - pointer to inode
1564 * @fattr - updated attributes
1565 *
1566 * After an operation that has changed the inode metadata, mark the
1567 * attribute cache as being invalid, then try to update it.
1568 *
1569 * NB: if the server didn't return any post op attributes, this
1570 * function will force the retrieval of attributes before the next
1571 * NFS request. Thus it should be used only for operations that
1572 * are expected to change one or more attributes, to avoid
1573 * unnecessary NFS requests and trips through nfs_update_inode().
1574 */
1575int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1576{
1577 int status;
1578
1579 spin_lock(&inode->i_lock);
1580 nfs_fattr_set_barrier(fattr);
1581 status = nfs_post_op_update_inode_locked(inode, fattr);
1582 spin_unlock(&inode->i_lock);
1583
1584 return status;
1585}
1586EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1587
1588/**
1589 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1590 * @inode - pointer to inode
1591 * @fattr - updated attributes
1592 *
1593 * After an operation that has changed the inode metadata, mark the
1594 * attribute cache as being invalid, then try to update it. Fake up
1595 * weak cache consistency data, if none exist.
1596 *
1597 * This function is mainly designed to be used by the ->write_done() functions.
1598 */
1599int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1600{
1601 int status;
1602
1603 /* Don't do a WCC update if these attributes are already stale */
1604 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1605 !nfs_inode_attrs_need_update(inode, fattr)) {
1606 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1607 | NFS_ATTR_FATTR_PRESIZE
1608 | NFS_ATTR_FATTR_PREMTIME
1609 | NFS_ATTR_FATTR_PRECTIME);
1610 goto out_noforce;
1611 }
1612 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1613 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1614 fattr->pre_change_attr = inode->i_version;
1615 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1616 }
1617 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1618 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1619 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1620 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1621 }
1622 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1623 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1624 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1625 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1626 }
1627 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1628 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1629 fattr->pre_size = i_size_read(inode);
1630 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1631 }
1632out_noforce:
1633 status = nfs_post_op_update_inode_locked(inode, fattr);
1634 return status;
1635}
1636
1637/**
1638 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1639 * @inode - pointer to inode
1640 * @fattr - updated attributes
1641 *
1642 * After an operation that has changed the inode metadata, mark the
1643 * attribute cache as being invalid, then try to update it. Fake up
1644 * weak cache consistency data, if none exist.
1645 *
1646 * This function is mainly designed to be used by the ->write_done() functions.
1647 */
1648int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1649{
1650 int status;
1651
1652 spin_lock(&inode->i_lock);
1653 nfs_fattr_set_barrier(fattr);
1654 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1655 spin_unlock(&inode->i_lock);
1656 return status;
1657}
1658EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1659
1660
1661static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1662 struct nfs_fattr *fattr)
1663{
1664 bool ret1 = true, ret2 = true;
1665
1666 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1667 ret1 = (nfsi->fileid == fattr->fileid);
1668 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1669 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1670 return ret1 || ret2;
1671}
1672
1673/*
1674 * Many nfs protocol calls return the new file attributes after
1675 * an operation. Here we update the inode to reflect the state
1676 * of the server's inode.
1677 *
1678 * This is a bit tricky because we have to make sure all dirty pages
1679 * have been sent off to the server before calling invalidate_inode_pages.
1680 * To make sure no other process adds more write requests while we try
1681 * our best to flush them, we make them sleep during the attribute refresh.
1682 *
1683 * A very similar scenario holds for the dir cache.
1684 */
1685static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1686{
1687 struct nfs_server *server;
1688 struct nfs_inode *nfsi = NFS_I(inode);
1689 loff_t cur_isize, new_isize;
1690 unsigned long invalid = 0;
1691 unsigned long now = jiffies;
1692 unsigned long save_cache_validity;
1693 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1694 bool cache_revalidated = true;
1695
1696 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1697 __func__, inode->i_sb->s_id, inode->i_ino,
1698 nfs_display_fhandle_hash(NFS_FH(inode)),
1699 atomic_read(&inode->i_count), fattr->valid);
1700
1701 if (!nfs_fileid_valid(nfsi, fattr)) {
1702 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1703 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1704 NFS_SERVER(inode)->nfs_client->cl_hostname,
1705 inode->i_sb->s_id, (long long)nfsi->fileid,
1706 (long long)fattr->fileid);
1707 goto out_err;
1708 }
1709
1710 /*
1711 * Make sure the inode's type hasn't changed.
1712 */
1713 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1714 /*
1715 * Big trouble! The inode has become a different object.
1716 */
1717 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1718 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1719 goto out_err;
1720 }
1721
1722 server = NFS_SERVER(inode);
1723 /* Update the fsid? */
1724 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1725 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1726 !IS_AUTOMOUNT(inode))
1727 server->fsid = fattr->fsid;
1728
1729 /*
1730 * Update the read time so we don't revalidate too often.
1731 */
1732 nfsi->read_cache_jiffies = fattr->time_start;
1733
1734 save_cache_validity = nfsi->cache_validity;
1735 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1736 | NFS_INO_INVALID_ATIME
1737 | NFS_INO_REVAL_FORCED
1738 | NFS_INO_REVAL_PAGECACHE);
1739
1740 /* Do atomic weak cache consistency updates */
1741 invalid |= nfs_wcc_update_inode(inode, fattr);
1742
1743 if (pnfs_layoutcommit_outstanding(inode)) {
1744 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1745 cache_revalidated = false;
1746 }
1747
1748 /* More cache consistency checks */
1749 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1750 if (inode->i_version != fattr->change_attr) {
1751 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1752 inode->i_sb->s_id, inode->i_ino);
1753 /* Could it be a race with writeback? */
1754 if (!have_writers) {
1755 invalid |= NFS_INO_INVALID_ATTR
1756 | NFS_INO_INVALID_DATA
1757 | NFS_INO_INVALID_ACCESS
1758 | NFS_INO_INVALID_ACL;
1759 if (S_ISDIR(inode->i_mode))
1760 nfs_force_lookup_revalidate(inode);
1761 }
1762 inode->i_version = fattr->change_attr;
1763 }
1764 } else {
1765 nfsi->cache_validity |= save_cache_validity;
1766 cache_revalidated = false;
1767 }
1768
1769 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1770 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1771 } else if (server->caps & NFS_CAP_MTIME) {
1772 nfsi->cache_validity |= save_cache_validity &
1773 (NFS_INO_INVALID_ATTR
1774 | NFS_INO_REVAL_FORCED);
1775 cache_revalidated = false;
1776 }
1777
1778 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1779 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1780 } else if (server->caps & NFS_CAP_CTIME) {
1781 nfsi->cache_validity |= save_cache_validity &
1782 (NFS_INO_INVALID_ATTR
1783 | NFS_INO_REVAL_FORCED);
1784 cache_revalidated = false;
1785 }
1786
1787 /* Check if our cached file size is stale */
1788 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1789 new_isize = nfs_size_to_loff_t(fattr->size);
1790 cur_isize = i_size_read(inode);
1791 if (new_isize != cur_isize) {
1792 /* Do we perhaps have any outstanding writes, or has
1793 * the file grown beyond our last write? */
1794 if (nfsi->nrequests == 0 || new_isize > cur_isize) {
1795 i_size_write(inode, new_isize);
1796 if (!have_writers)
1797 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1798 }
1799 dprintk("NFS: isize change on server for file %s/%ld "
1800 "(%Ld to %Ld)\n",
1801 inode->i_sb->s_id,
1802 inode->i_ino,
1803 (long long)cur_isize,
1804 (long long)new_isize);
1805 }
1806 } else {
1807 nfsi->cache_validity |= save_cache_validity &
1808 (NFS_INO_INVALID_ATTR
1809 | NFS_INO_REVAL_PAGECACHE
1810 | NFS_INO_REVAL_FORCED);
1811 cache_revalidated = false;
1812 }
1813
1814
1815 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1816 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1817 else if (server->caps & NFS_CAP_ATIME) {
1818 nfsi->cache_validity |= save_cache_validity &
1819 (NFS_INO_INVALID_ATIME
1820 | NFS_INO_REVAL_FORCED);
1821 cache_revalidated = false;
1822 }
1823
1824 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1825 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1826 umode_t newmode = inode->i_mode & S_IFMT;
1827 newmode |= fattr->mode & S_IALLUGO;
1828 inode->i_mode = newmode;
1829 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1830 }
1831 } else if (server->caps & NFS_CAP_MODE) {
1832 nfsi->cache_validity |= save_cache_validity &
1833 (NFS_INO_INVALID_ATTR
1834 | NFS_INO_INVALID_ACCESS
1835 | NFS_INO_INVALID_ACL
1836 | NFS_INO_REVAL_FORCED);
1837 cache_revalidated = false;
1838 }
1839
1840 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1841 if (!uid_eq(inode->i_uid, fattr->uid)) {
1842 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1843 inode->i_uid = fattr->uid;
1844 }
1845 } else if (server->caps & NFS_CAP_OWNER) {
1846 nfsi->cache_validity |= save_cache_validity &
1847 (NFS_INO_INVALID_ATTR
1848 | NFS_INO_INVALID_ACCESS
1849 | NFS_INO_INVALID_ACL
1850 | NFS_INO_REVAL_FORCED);
1851 cache_revalidated = false;
1852 }
1853
1854 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1855 if (!gid_eq(inode->i_gid, fattr->gid)) {
1856 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1857 inode->i_gid = fattr->gid;
1858 }
1859 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
1860 nfsi->cache_validity |= save_cache_validity &
1861 (NFS_INO_INVALID_ATTR
1862 | NFS_INO_INVALID_ACCESS
1863 | NFS_INO_INVALID_ACL
1864 | NFS_INO_REVAL_FORCED);
1865 cache_revalidated = false;
1866 }
1867
1868 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1869 if (inode->i_nlink != fattr->nlink) {
1870 invalid |= NFS_INO_INVALID_ATTR;
1871 if (S_ISDIR(inode->i_mode))
1872 invalid |= NFS_INO_INVALID_DATA;
1873 set_nlink(inode, fattr->nlink);
1874 }
1875 } else if (server->caps & NFS_CAP_NLINK) {
1876 nfsi->cache_validity |= save_cache_validity &
1877 (NFS_INO_INVALID_ATTR
1878 | NFS_INO_REVAL_FORCED);
1879 cache_revalidated = false;
1880 }
1881
1882 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1883 /*
1884 * report the blocks in 512byte units
1885 */
1886 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1887 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1888 inode->i_blocks = fattr->du.nfs2.blocks;
1889 else
1890 cache_revalidated = false;
1891
1892 /* Update attrtimeo value if we're out of the unstable period */
1893 if (invalid & NFS_INO_INVALID_ATTR) {
1894 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1895 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1896 nfsi->attrtimeo_timestamp = now;
1897 /* Set barrier to be more recent than all outstanding updates */
1898 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1899 } else {
1900 if (cache_revalidated) {
1901 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
1902 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1903 nfsi->attrtimeo <<= 1;
1904 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
1905 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1906 }
1907 nfsi->attrtimeo_timestamp = now;
1908 }
1909 /* Set the barrier to be more recent than this fattr */
1910 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
1911 nfsi->attr_gencount = fattr->gencount;
1912 }
1913
1914 /* Don't declare attrcache up to date if there were no attrs! */
1915 if (cache_revalidated)
1916 invalid &= ~NFS_INO_INVALID_ATTR;
1917
1918 /* Don't invalidate the data if we were to blame */
1919 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1920 || S_ISLNK(inode->i_mode)))
1921 invalid &= ~NFS_INO_INVALID_DATA;
1922 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1923 (save_cache_validity & NFS_INO_REVAL_FORCED))
1924 nfs_set_cache_invalid(inode, invalid);
1925
1926 return 0;
1927 out_err:
1928 /*
1929 * No need to worry about unhashing the dentry, as the
1930 * lookup validation will know that the inode is bad.
1931 * (But we fall through to invalidate the caches.)
1932 */
1933 nfs_invalidate_inode(inode);
1934 return -ESTALE;
1935}
1936
1937struct inode *nfs_alloc_inode(struct super_block *sb)
1938{
1939 struct nfs_inode *nfsi;
1940 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1941 if (!nfsi)
1942 return NULL;
1943 nfsi->flags = 0UL;
1944 nfsi->cache_validity = 0UL;
1945#if IS_ENABLED(CONFIG_NFS_V4)
1946 nfsi->nfs4_acl = NULL;
1947#endif /* CONFIG_NFS_V4 */
1948 return &nfsi->vfs_inode;
1949}
1950EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1951
1952static void nfs_i_callback(struct rcu_head *head)
1953{
1954 struct inode *inode = container_of(head, struct inode, i_rcu);
1955 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1956}
1957
1958void nfs_destroy_inode(struct inode *inode)
1959{
1960 call_rcu(&inode->i_rcu, nfs_i_callback);
1961}
1962EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1963
1964static inline void nfs4_init_once(struct nfs_inode *nfsi)
1965{
1966#if IS_ENABLED(CONFIG_NFS_V4)
1967 INIT_LIST_HEAD(&nfsi->open_states);
1968 nfsi->delegation = NULL;
1969 init_rwsem(&nfsi->rwsem);
1970 nfsi->layout = NULL;
1971#endif
1972}
1973
1974static void init_once(void *foo)
1975{
1976 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1977
1978 inode_init_once(&nfsi->vfs_inode);
1979 INIT_LIST_HEAD(&nfsi->open_files);
1980 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1981 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1982 INIT_LIST_HEAD(&nfsi->commit_info.list);
1983 nfsi->nrequests = 0;
1984 nfsi->commit_info.ncommit = 0;
1985 atomic_set(&nfsi->commit_info.rpcs_out, 0);
1986 init_rwsem(&nfsi->rmdir_sem);
1987 nfs4_init_once(nfsi);
1988}
1989
1990static int __init nfs_init_inodecache(void)
1991{
1992 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1993 sizeof(struct nfs_inode),
1994 0, (SLAB_RECLAIM_ACCOUNT|
1995 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1996 init_once);
1997 if (nfs_inode_cachep == NULL)
1998 return -ENOMEM;
1999
2000 return 0;
2001}
2002
2003static void nfs_destroy_inodecache(void)
2004{
2005 /*
2006 * Make sure all delayed rcu free inodes are flushed before we
2007 * destroy cache.
2008 */
2009 rcu_barrier();
2010 kmem_cache_destroy(nfs_inode_cachep);
2011}
2012
2013struct workqueue_struct *nfsiod_workqueue;
2014EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2015
2016/*
2017 * start up the nfsiod workqueue
2018 */
2019static int nfsiod_start(void)
2020{
2021 struct workqueue_struct *wq;
2022 dprintk("RPC: creating workqueue nfsiod\n");
2023 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
2024 if (wq == NULL)
2025 return -ENOMEM;
2026 nfsiod_workqueue = wq;
2027 return 0;
2028}
2029
2030/*
2031 * Destroy the nfsiod workqueue
2032 */
2033static void nfsiod_stop(void)
2034{
2035 struct workqueue_struct *wq;
2036
2037 wq = nfsiod_workqueue;
2038 if (wq == NULL)
2039 return;
2040 nfsiod_workqueue = NULL;
2041 destroy_workqueue(wq);
2042}
2043
2044unsigned int nfs_net_id;
2045EXPORT_SYMBOL_GPL(nfs_net_id);
2046
2047static int nfs_net_init(struct net *net)
2048{
2049 nfs_clients_init(net);
2050 return nfs_fs_proc_net_init(net);
2051}
2052
2053static void nfs_net_exit(struct net *net)
2054{
2055 nfs_fs_proc_net_exit(net);
2056 nfs_cleanup_cb_ident_idr(net);
2057}
2058
2059static struct pernet_operations nfs_net_ops = {
2060 .init = nfs_net_init,
2061 .exit = nfs_net_exit,
2062 .id = &nfs_net_id,
2063 .size = sizeof(struct nfs_net),
2064};
2065
2066/*
2067 * Initialize NFS
2068 */
2069static int __init init_nfs_fs(void)
2070{
2071 int err;
2072
2073 err = register_pernet_subsys(&nfs_net_ops);
2074 if (err < 0)
2075 goto out9;
2076
2077 err = nfs_fscache_register();
2078 if (err < 0)
2079 goto out8;
2080
2081 err = nfsiod_start();
2082 if (err)
2083 goto out7;
2084
2085 err = nfs_fs_proc_init();
2086 if (err)
2087 goto out6;
2088
2089 err = nfs_init_nfspagecache();
2090 if (err)
2091 goto out5;
2092
2093 err = nfs_init_inodecache();
2094 if (err)
2095 goto out4;
2096
2097 err = nfs_init_readpagecache();
2098 if (err)
2099 goto out3;
2100
2101 err = nfs_init_writepagecache();
2102 if (err)
2103 goto out2;
2104
2105 err = nfs_init_directcache();
2106 if (err)
2107 goto out1;
2108
2109 rpc_proc_register(&init_net, &nfs_rpcstat);
2110
2111 err = register_nfs_fs();
2112 if (err)
2113 goto out0;
2114
2115 return 0;
2116out0:
2117 rpc_proc_unregister(&init_net, "nfs");
2118 nfs_destroy_directcache();
2119out1:
2120 nfs_destroy_writepagecache();
2121out2:
2122 nfs_destroy_readpagecache();
2123out3:
2124 nfs_destroy_inodecache();
2125out4:
2126 nfs_destroy_nfspagecache();
2127out5:
2128 nfs_fs_proc_exit();
2129out6:
2130 nfsiod_stop();
2131out7:
2132 nfs_fscache_unregister();
2133out8:
2134 unregister_pernet_subsys(&nfs_net_ops);
2135out9:
2136 return err;
2137}
2138
2139static void __exit exit_nfs_fs(void)
2140{
2141 nfs_destroy_directcache();
2142 nfs_destroy_writepagecache();
2143 nfs_destroy_readpagecache();
2144 nfs_destroy_inodecache();
2145 nfs_destroy_nfspagecache();
2146 nfs_fscache_unregister();
2147 unregister_pernet_subsys(&nfs_net_ops);
2148 rpc_proc_unregister(&init_net, "nfs");
2149 unregister_nfs_fs();
2150 nfs_fs_proc_exit();
2151 nfsiod_stop();
2152}
2153
2154/* Not quite true; I just maintain it */
2155MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2156MODULE_LICENSE("GPL");
2157module_param(enable_ino64, bool, 0644);
2158
2159module_init(init_nfs_fs)
2160module_exit(exit_nfs_fs)