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ixgbe: Add support for IPv6 and UDP to ixgbe_get_headlen
[linux-2.6/cjktty.git] / fs / nfs / inode.c
blob5c7325c5c5e66b23beacd6fb7485fda5a640dcd9
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 #include <linux/crc32.h>
42
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 #include "nfs.h"
54 #include "netns.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 */
61 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
62
63 static void nfs_invalidate_inode(struct inode *);
64 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
65
66 static struct kmem_cache * nfs_inode_cachep;
67
68 static inline unsigned long
69 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
70 {
71 return nfs_fileid_to_ino_t(fattr->fileid);
72 }
73
74 /**
75 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
76 * @word: long word containing the bit lock
77 */
78 int nfs_wait_bit_killable(void *word)
79 {
80 if (fatal_signal_pending(current))
81 return -ERESTARTSYS;
82 freezable_schedule();
83 return 0;
84 }
85 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
86
87 /**
88 * nfs_compat_user_ino64 - returns the user-visible inode number
89 * @fileid: 64-bit fileid
90 *
91 * This function returns a 32-bit inode number if the boot parameter
92 * nfs.enable_ino64 is zero.
93 */
94 u64 nfs_compat_user_ino64(u64 fileid)
95 {
96 #ifdef CONFIG_COMPAT
97 compat_ulong_t ino;
98 #else
99 unsigned long ino;
100 #endif
101
102 if (enable_ino64)
103 return fileid;
104 ino = fileid;
105 if (sizeof(ino) < sizeof(fileid))
106 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
107 return ino;
108 }
109
110 void nfs_clear_inode(struct inode *inode)
111 {
112 /*
113 * The following should never happen...
114 */
115 BUG_ON(nfs_have_writebacks(inode));
116 BUG_ON(!list_empty(&NFS_I(inode)->open_files));
117 nfs_zap_acl_cache(inode);
118 nfs_access_zap_cache(inode);
119 nfs_fscache_release_inode_cookie(inode);
120 }
121 EXPORT_SYMBOL_GPL(nfs_clear_inode);
122
123 void nfs_evict_inode(struct inode *inode)
124 {
125 truncate_inode_pages(&inode->i_data, 0);
126 clear_inode(inode);
127 nfs_clear_inode(inode);
128 }
129
130 /**
131 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
132 */
133 int nfs_sync_mapping(struct address_space *mapping)
134 {
135 int ret = 0;
136
137 if (mapping->nrpages != 0) {
138 unmap_mapping_range(mapping, 0, 0, 0);
139 ret = nfs_wb_all(mapping->host);
140 }
141 return ret;
142 }
143
144 /*
145 * Invalidate the local caches
146 */
147 static void nfs_zap_caches_locked(struct inode *inode)
148 {
149 struct nfs_inode *nfsi = NFS_I(inode);
150 int mode = inode->i_mode;
151
152 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
153
154 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
155 nfsi->attrtimeo_timestamp = jiffies;
156
157 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
158 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
159 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
160 else
161 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
162 }
163
164 void nfs_zap_caches(struct inode *inode)
165 {
166 spin_lock(&inode->i_lock);
167 nfs_zap_caches_locked(inode);
168 spin_unlock(&inode->i_lock);
169 }
170
171 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
172 {
173 if (mapping->nrpages != 0) {
174 spin_lock(&inode->i_lock);
175 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
176 spin_unlock(&inode->i_lock);
177 }
178 }
179
180 void nfs_zap_acl_cache(struct inode *inode)
181 {
182 void (*clear_acl_cache)(struct inode *);
183
184 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
185 if (clear_acl_cache != NULL)
186 clear_acl_cache(inode);
187 spin_lock(&inode->i_lock);
188 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
189 spin_unlock(&inode->i_lock);
190 }
191 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
192
193 void nfs_invalidate_atime(struct inode *inode)
194 {
195 spin_lock(&inode->i_lock);
196 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
197 spin_unlock(&inode->i_lock);
198 }
199 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
200
201 /*
202 * Invalidate, but do not unhash, the inode.
203 * NB: must be called with inode->i_lock held!
204 */
205 static void nfs_invalidate_inode(struct inode *inode)
206 {
207 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
208 nfs_zap_caches_locked(inode);
209 }
210
211 struct nfs_find_desc {
212 struct nfs_fh *fh;
213 struct nfs_fattr *fattr;
214 };
215
216 /*
217 * In NFSv3 we can have 64bit inode numbers. In order to support
218 * this, and re-exported directories (also seen in NFSv2)
219 * we are forced to allow 2 different inodes to have the same
220 * i_ino.
221 */
222 static int
223 nfs_find_actor(struct inode *inode, void *opaque)
224 {
225 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
226 struct nfs_fh *fh = desc->fh;
227 struct nfs_fattr *fattr = desc->fattr;
228
229 if (NFS_FILEID(inode) != fattr->fileid)
230 return 0;
231 if (nfs_compare_fh(NFS_FH(inode), fh))
232 return 0;
233 if (is_bad_inode(inode) || NFS_STALE(inode))
234 return 0;
235 return 1;
236 }
237
238 static int
239 nfs_init_locked(struct inode *inode, void *opaque)
240 {
241 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
242 struct nfs_fattr *fattr = desc->fattr;
243
244 set_nfs_fileid(inode, fattr->fileid);
245 nfs_copy_fh(NFS_FH(inode), desc->fh);
246 return 0;
247 }
248
249 /*
250 * This is our front-end to iget that looks up inodes by file handle
251 * instead of inode number.
252 */
253 struct inode *
254 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
255 {
256 struct nfs_find_desc desc = {
257 .fh = fh,
258 .fattr = fattr
259 };
260 struct inode *inode = ERR_PTR(-ENOENT);
261 unsigned long hash;
262
263 nfs_attr_check_mountpoint(sb, fattr);
264
265 if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
266 !nfs_attr_use_mounted_on_fileid(fattr))
267 goto out_no_inode;
268 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
269 goto out_no_inode;
270
271 hash = nfs_fattr_to_ino_t(fattr);
272
273 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
274 if (inode == NULL) {
275 inode = ERR_PTR(-ENOMEM);
276 goto out_no_inode;
277 }
278
279 if (inode->i_state & I_NEW) {
280 struct nfs_inode *nfsi = NFS_I(inode);
281 unsigned long now = jiffies;
282
283 /* We set i_ino for the few things that still rely on it,
284 * such as stat(2) */
285 inode->i_ino = hash;
286
287 /* We can't support update_atime(), since the server will reset it */
288 inode->i_flags |= S_NOATIME|S_NOCMTIME;
289 inode->i_mode = fattr->mode;
290 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
291 && nfs_server_capable(inode, NFS_CAP_MODE))
292 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
293 /* Why so? Because we want revalidate for devices/FIFOs, and
294 * that's precisely what we have in nfs_file_inode_operations.
295 */
296 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
297 if (S_ISREG(inode->i_mode)) {
298 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
299 inode->i_data.a_ops = &nfs_file_aops;
300 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
301 } else if (S_ISDIR(inode->i_mode)) {
302 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
303 inode->i_fop = &nfs_dir_operations;
304 inode->i_data.a_ops = &nfs_dir_aops;
305 /* Deal with crossing mountpoints */
306 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
307 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
308 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
309 inode->i_op = &nfs_referral_inode_operations;
310 else
311 inode->i_op = &nfs_mountpoint_inode_operations;
312 inode->i_fop = NULL;
313 inode->i_flags |= S_AUTOMOUNT;
314 }
315 } else if (S_ISLNK(inode->i_mode))
316 inode->i_op = &nfs_symlink_inode_operations;
317 else
318 init_special_inode(inode, inode->i_mode, fattr->rdev);
319
320 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
321 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
322 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
323 inode->i_version = 0;
324 inode->i_size = 0;
325 clear_nlink(inode);
326 inode->i_uid = -2;
327 inode->i_gid = -2;
328 inode->i_blocks = 0;
329 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
330 nfsi->write_io = 0;
331 nfsi->read_io = 0;
332
333 nfsi->read_cache_jiffies = fattr->time_start;
334 nfsi->attr_gencount = fattr->gencount;
335 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
336 inode->i_atime = fattr->atime;
337 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
338 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
339 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
340 inode->i_mtime = fattr->mtime;
341 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
342 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
343 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
344 inode->i_ctime = fattr->ctime;
345 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
346 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
347 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
348 inode->i_version = fattr->change_attr;
349 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
350 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
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_REVAL_PAGECACHE;
356 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
357 set_nlink(inode, fattr->nlink);
358 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
359 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
360 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
361 inode->i_uid = fattr->uid;
362 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
363 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
364 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
365 inode->i_gid = fattr->gid;
366 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
367 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
368 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
369 inode->i_blocks = fattr->du.nfs2.blocks;
370 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
371 /*
372 * report the blocks in 512byte units
373 */
374 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
375 }
376 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
377 nfsi->attrtimeo_timestamp = now;
378 nfsi->access_cache = RB_ROOT;
379
380 nfs_fscache_init_inode_cookie(inode);
381
382 unlock_new_inode(inode);
383 } else
384 nfs_refresh_inode(inode, fattr);
385 dprintk("NFS: nfs_fhget(%s/%Ld fh_crc=0x%08x ct=%d)\n",
386 inode->i_sb->s_id,
387 (long long)NFS_FILEID(inode),
388 nfs_display_fhandle_hash(fh),
389 atomic_read(&inode->i_count));
390
391 out:
392 return inode;
393
394 out_no_inode:
395 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
396 goto out;
397 }
398 EXPORT_SYMBOL_GPL(nfs_fhget);
399
400 #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)
401
402 int
403 nfs_setattr(struct dentry *dentry, struct iattr *attr)
404 {
405 struct inode *inode = dentry->d_inode;
406 struct nfs_fattr *fattr;
407 int error = -ENOMEM;
408
409 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
410
411 /* skip mode change if it's just for clearing setuid/setgid */
412 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
413 attr->ia_valid &= ~ATTR_MODE;
414
415 if (attr->ia_valid & ATTR_SIZE) {
416 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
417 attr->ia_valid &= ~ATTR_SIZE;
418 }
419
420 /* Optimization: if the end result is no change, don't RPC */
421 attr->ia_valid &= NFS_VALID_ATTRS;
422 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
423 return 0;
424
425 /* Write all dirty data */
426 if (S_ISREG(inode->i_mode)) {
427 nfs_inode_dio_wait(inode);
428 nfs_wb_all(inode);
429 }
430
431 fattr = nfs_alloc_fattr();
432 if (fattr == NULL)
433 goto out;
434 /*
435 * Return any delegations if we're going to change ACLs
436 */
437 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
438 NFS_PROTO(inode)->return_delegation(inode);
439 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
440 if (error == 0)
441 nfs_refresh_inode(inode, fattr);
442 nfs_free_fattr(fattr);
443 out:
444 return error;
445 }
446 EXPORT_SYMBOL_GPL(nfs_setattr);
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 */
457 static 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);
472 out:
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 */
484 void 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 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
506
507 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
508 {
509 struct inode *inode = dentry->d_inode;
510 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
511 int err;
512
513 /* Flush out writes to the server in order to update c/mtime. */
514 if (S_ISREG(inode->i_mode)) {
515 nfs_inode_dio_wait(inode);
516 err = filemap_write_and_wait(inode->i_mapping);
517 if (err)
518 goto out;
519 }
520
521 /*
522 * We may force a getattr if the user cares about atime.
523 *
524 * Note that we only have to check the vfsmount flags here:
525 * - NFS always sets S_NOATIME by so checking it would give a
526 * bogus result
527 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
528 * no point in checking those.
529 */
530 if ((mnt->mnt_flags & MNT_NOATIME) ||
531 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
532 need_atime = 0;
533
534 if (need_atime)
535 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
536 else
537 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
538 if (!err) {
539 generic_fillattr(inode, stat);
540 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
541 }
542 out:
543 return err;
544 }
545 EXPORT_SYMBOL_GPL(nfs_getattr);
546
547 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
548 {
549 atomic_set(&l_ctx->count, 1);
550 l_ctx->lockowner.l_owner = current->files;
551 l_ctx->lockowner.l_pid = current->tgid;
552 INIT_LIST_HEAD(&l_ctx->list);
553 }
554
555 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
556 {
557 struct nfs_lock_context *pos;
558
559 list_for_each_entry(pos, &ctx->lock_context.list, list) {
560 if (pos->lockowner.l_owner != current->files)
561 continue;
562 if (pos->lockowner.l_pid != current->tgid)
563 continue;
564 atomic_inc(&pos->count);
565 return pos;
566 }
567 return NULL;
568 }
569
570 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
571 {
572 struct nfs_lock_context *res, *new = NULL;
573 struct inode *inode = ctx->dentry->d_inode;
574
575 spin_lock(&inode->i_lock);
576 res = __nfs_find_lock_context(ctx);
577 if (res == NULL) {
578 spin_unlock(&inode->i_lock);
579 new = kmalloc(sizeof(*new), GFP_KERNEL);
580 if (new == NULL)
581 return ERR_PTR(-ENOMEM);
582 nfs_init_lock_context(new);
583 spin_lock(&inode->i_lock);
584 res = __nfs_find_lock_context(ctx);
585 if (res == NULL) {
586 list_add_tail(&new->list, &ctx->lock_context.list);
587 new->open_context = ctx;
588 res = new;
589 new = NULL;
590 }
591 }
592 spin_unlock(&inode->i_lock);
593 kfree(new);
594 return res;
595 }
596
597 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
598 {
599 struct nfs_open_context *ctx = l_ctx->open_context;
600 struct inode *inode = ctx->dentry->d_inode;
601
602 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
603 return;
604 list_del(&l_ctx->list);
605 spin_unlock(&inode->i_lock);
606 kfree(l_ctx);
607 }
608
609 /**
610 * nfs_close_context - Common close_context() routine NFSv2/v3
611 * @ctx: pointer to context
612 * @is_sync: is this a synchronous close
613 *
614 * always ensure that the attributes are up to date if we're mounted
615 * with close-to-open semantics
616 */
617 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
618 {
619 struct inode *inode;
620 struct nfs_server *server;
621
622 if (!(ctx->mode & FMODE_WRITE))
623 return;
624 if (!is_sync)
625 return;
626 inode = ctx->dentry->d_inode;
627 if (!list_empty(&NFS_I(inode)->open_files))
628 return;
629 server = NFS_SERVER(inode);
630 if (server->flags & NFS_MOUNT_NOCTO)
631 return;
632 nfs_revalidate_inode(server, inode);
633 }
634 EXPORT_SYMBOL_GPL(nfs_close_context);
635
636 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
637 {
638 struct nfs_open_context *ctx;
639 struct rpc_cred *cred = rpc_lookup_cred();
640 if (IS_ERR(cred))
641 return ERR_CAST(cred);
642
643 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
644 if (!ctx) {
645 put_rpccred(cred);
646 return ERR_PTR(-ENOMEM);
647 }
648 nfs_sb_active(dentry->d_sb);
649 ctx->dentry = dget(dentry);
650 ctx->cred = cred;
651 ctx->state = NULL;
652 ctx->mode = f_mode;
653 ctx->flags = 0;
654 ctx->error = 0;
655 nfs_init_lock_context(&ctx->lock_context);
656 ctx->lock_context.open_context = ctx;
657 INIT_LIST_HEAD(&ctx->list);
658 ctx->mdsthreshold = NULL;
659 return ctx;
660 }
661 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
662
663 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
664 {
665 if (ctx != NULL)
666 atomic_inc(&ctx->lock_context.count);
667 return ctx;
668 }
669 EXPORT_SYMBOL_GPL(get_nfs_open_context);
670
671 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
672 {
673 struct inode *inode = ctx->dentry->d_inode;
674 struct super_block *sb = ctx->dentry->d_sb;
675
676 if (!list_empty(&ctx->list)) {
677 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
678 return;
679 list_del(&ctx->list);
680 spin_unlock(&inode->i_lock);
681 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
682 return;
683 if (inode != NULL)
684 NFS_PROTO(inode)->close_context(ctx, is_sync);
685 if (ctx->cred != NULL)
686 put_rpccred(ctx->cred);
687 dput(ctx->dentry);
688 nfs_sb_deactive(sb);
689 kfree(ctx->mdsthreshold);
690 kfree(ctx);
691 }
692
693 void put_nfs_open_context(struct nfs_open_context *ctx)
694 {
695 __put_nfs_open_context(ctx, 0);
696 }
697 EXPORT_SYMBOL_GPL(put_nfs_open_context);
698
699 /*
700 * Ensure that mmap has a recent RPC credential for use when writing out
701 * shared pages
702 */
703 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
704 {
705 struct inode *inode = filp->f_path.dentry->d_inode;
706 struct nfs_inode *nfsi = NFS_I(inode);
707
708 filp->private_data = get_nfs_open_context(ctx);
709 spin_lock(&inode->i_lock);
710 list_add(&ctx->list, &nfsi->open_files);
711 spin_unlock(&inode->i_lock);
712 }
713 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
714
715 /*
716 * Given an inode, search for an open context with the desired characteristics
717 */
718 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
719 {
720 struct nfs_inode *nfsi = NFS_I(inode);
721 struct nfs_open_context *pos, *ctx = NULL;
722
723 spin_lock(&inode->i_lock);
724 list_for_each_entry(pos, &nfsi->open_files, list) {
725 if (cred != NULL && pos->cred != cred)
726 continue;
727 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
728 continue;
729 ctx = get_nfs_open_context(pos);
730 break;
731 }
732 spin_unlock(&inode->i_lock);
733 return ctx;
734 }
735
736 static void nfs_file_clear_open_context(struct file *filp)
737 {
738 struct inode *inode = filp->f_path.dentry->d_inode;
739 struct nfs_open_context *ctx = nfs_file_open_context(filp);
740
741 if (ctx) {
742 filp->private_data = NULL;
743 spin_lock(&inode->i_lock);
744 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
745 spin_unlock(&inode->i_lock);
746 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
747 }
748 }
749
750 /*
751 * These allocate and release file read/write context information.
752 */
753 int nfs_open(struct inode *inode, struct file *filp)
754 {
755 struct nfs_open_context *ctx;
756
757 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
758 if (IS_ERR(ctx))
759 return PTR_ERR(ctx);
760 nfs_file_set_open_context(filp, ctx);
761 put_nfs_open_context(ctx);
762 nfs_fscache_set_inode_cookie(inode, filp);
763 return 0;
764 }
765
766 int nfs_release(struct inode *inode, struct file *filp)
767 {
768 nfs_file_clear_open_context(filp);
769 return 0;
770 }
771
772 /*
773 * This function is called whenever some part of NFS notices that
774 * the cached attributes have to be refreshed.
775 */
776 int
777 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
778 {
779 int status = -ESTALE;
780 struct nfs_fattr *fattr = NULL;
781 struct nfs_inode *nfsi = NFS_I(inode);
782
783 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
784 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
785
786 if (is_bad_inode(inode))
787 goto out;
788 if (NFS_STALE(inode))
789 goto out;
790
791 status = -ENOMEM;
792 fattr = nfs_alloc_fattr();
793 if (fattr == NULL)
794 goto out;
795
796 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
797 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr);
798 if (status != 0) {
799 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
800 inode->i_sb->s_id,
801 (long long)NFS_FILEID(inode), status);
802 if (status == -ESTALE) {
803 nfs_zap_caches(inode);
804 if (!S_ISDIR(inode->i_mode))
805 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
806 }
807 goto out;
808 }
809
810 status = nfs_refresh_inode(inode, fattr);
811 if (status) {
812 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
813 inode->i_sb->s_id,
814 (long long)NFS_FILEID(inode), status);
815 goto out;
816 }
817
818 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
819 nfs_zap_acl_cache(inode);
820
821 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
822 inode->i_sb->s_id,
823 (long long)NFS_FILEID(inode));
824
825 out:
826 nfs_free_fattr(fattr);
827 return status;
828 }
829
830 int nfs_attribute_timeout(struct inode *inode)
831 {
832 struct nfs_inode *nfsi = NFS_I(inode);
833
834 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
835 }
836
837 static int nfs_attribute_cache_expired(struct inode *inode)
838 {
839 if (nfs_have_delegated_attributes(inode))
840 return 0;
841 return nfs_attribute_timeout(inode);
842 }
843
844 /**
845 * nfs_revalidate_inode - Revalidate the inode attributes
846 * @server - pointer to nfs_server struct
847 * @inode - pointer to inode struct
848 *
849 * Updates inode attribute information by retrieving the data from the server.
850 */
851 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
852 {
853 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
854 && !nfs_attribute_cache_expired(inode))
855 return NFS_STALE(inode) ? -ESTALE : 0;
856 return __nfs_revalidate_inode(server, inode);
857 }
858 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
859
860 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
861 {
862 struct nfs_inode *nfsi = NFS_I(inode);
863
864 if (mapping->nrpages != 0) {
865 int ret = invalidate_inode_pages2(mapping);
866 if (ret < 0)
867 return ret;
868 }
869 spin_lock(&inode->i_lock);
870 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
871 if (S_ISDIR(inode->i_mode))
872 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
873 spin_unlock(&inode->i_lock);
874 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
875 nfs_fscache_reset_inode_cookie(inode);
876 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
877 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
878 return 0;
879 }
880
881 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
882 {
883 if (nfs_have_delegated_attributes(inode))
884 return false;
885 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
886 || nfs_attribute_timeout(inode)
887 || NFS_STALE(inode);
888 }
889
890 /**
891 * nfs_revalidate_mapping - Revalidate the pagecache
892 * @inode - pointer to host inode
893 * @mapping - pointer to mapping
894 */
895 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
896 {
897 struct nfs_inode *nfsi = NFS_I(inode);
898 int ret = 0;
899
900 /* swapfiles are not supposed to be shared. */
901 if (IS_SWAPFILE(inode))
902 goto out;
903
904 if (nfs_mapping_need_revalidate_inode(inode)) {
905 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
906 if (ret < 0)
907 goto out;
908 }
909 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
910 ret = nfs_invalidate_mapping(inode, mapping);
911 out:
912 return ret;
913 }
914
915 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
916 {
917 struct nfs_inode *nfsi = NFS_I(inode);
918 unsigned long ret = 0;
919
920 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
921 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
922 && inode->i_version == fattr->pre_change_attr) {
923 inode->i_version = fattr->change_attr;
924 if (S_ISDIR(inode->i_mode))
925 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
926 ret |= NFS_INO_INVALID_ATTR;
927 }
928 /* If we have atomic WCC data, we may update some attributes */
929 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
930 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
931 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
932 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
933 ret |= NFS_INO_INVALID_ATTR;
934 }
935
936 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
937 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
938 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
939 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
940 if (S_ISDIR(inode->i_mode))
941 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
942 ret |= NFS_INO_INVALID_ATTR;
943 }
944 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
945 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
946 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
947 && nfsi->npages == 0) {
948 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
949 ret |= NFS_INO_INVALID_ATTR;
950 }
951 return ret;
952 }
953
954 /**
955 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
956 * @inode - pointer to inode
957 * @fattr - updated attributes
958 *
959 * Verifies the attribute cache. If we have just changed the attributes,
960 * so that fattr carries weak cache consistency data, then it may
961 * also update the ctime/mtime/change_attribute.
962 */
963 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
964 {
965 struct nfs_inode *nfsi = NFS_I(inode);
966 loff_t cur_size, new_isize;
967 unsigned long invalid = 0;
968
969
970 if (nfs_have_delegated_attributes(inode))
971 return 0;
972 /* Has the inode gone and changed behind our back? */
973 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
974 return -EIO;
975 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
976 return -EIO;
977
978 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
979 inode->i_version != fattr->change_attr)
980 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
981
982 /* Verify a few of the more important attributes */
983 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
984 invalid |= NFS_INO_INVALID_ATTR;
985
986 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
987 cur_size = i_size_read(inode);
988 new_isize = nfs_size_to_loff_t(fattr->size);
989 if (cur_size != new_isize && nfsi->npages == 0)
990 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
991 }
992
993 /* Have any file permissions changed? */
994 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
995 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
996 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && inode->i_uid != fattr->uid)
997 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
998 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && inode->i_gid != fattr->gid)
999 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1000
1001 /* Has the link count changed? */
1002 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1003 invalid |= NFS_INO_INVALID_ATTR;
1004
1005 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1006 invalid |= NFS_INO_INVALID_ATIME;
1007
1008 if (invalid != 0)
1009 nfsi->cache_validity |= invalid;
1010
1011 nfsi->read_cache_jiffies = fattr->time_start;
1012 return 0;
1013 }
1014
1015 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1016 {
1017 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1018 return 0;
1019 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1020 }
1021
1022 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1023 {
1024 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1025 return 0;
1026 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1027 }
1028
1029 static atomic_long_t nfs_attr_generation_counter;
1030
1031 static unsigned long nfs_read_attr_generation_counter(void)
1032 {
1033 return atomic_long_read(&nfs_attr_generation_counter);
1034 }
1035
1036 unsigned long nfs_inc_attr_generation_counter(void)
1037 {
1038 return atomic_long_inc_return(&nfs_attr_generation_counter);
1039 }
1040
1041 void nfs_fattr_init(struct nfs_fattr *fattr)
1042 {
1043 fattr->valid = 0;
1044 fattr->time_start = jiffies;
1045 fattr->gencount = nfs_inc_attr_generation_counter();
1046 fattr->owner_name = NULL;
1047 fattr->group_name = NULL;
1048 }
1049 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1050
1051 struct nfs_fattr *nfs_alloc_fattr(void)
1052 {
1053 struct nfs_fattr *fattr;
1054
1055 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1056 if (fattr != NULL)
1057 nfs_fattr_init(fattr);
1058 return fattr;
1059 }
1060 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1061
1062 struct nfs_fh *nfs_alloc_fhandle(void)
1063 {
1064 struct nfs_fh *fh;
1065
1066 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1067 if (fh != NULL)
1068 fh->size = 0;
1069 return fh;
1070 }
1071 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1072
1073 #ifdef NFS_DEBUG
1074 /*
1075 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1076 * in the same way that wireshark does
1077 *
1078 * @fh: file handle
1079 *
1080 * For debugging only.
1081 */
1082 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1083 {
1084 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1085 * not on the result */
1086 return ~crc32(0xFFFFFFFF, &fh->data[0], fh->size);
1087 }
1088
1089 /*
1090 * _nfs_display_fhandle - display an NFS file handle on the console
1091 *
1092 * @fh: file handle to display
1093 * @caption: display caption
1094 *
1095 * For debugging only.
1096 */
1097 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1098 {
1099 unsigned short i;
1100
1101 if (fh == NULL || fh->size == 0) {
1102 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1103 return;
1104 }
1105
1106 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1107 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1108 for (i = 0; i < fh->size; i += 16) {
1109 __be32 *pos = (__be32 *)&fh->data[i];
1110
1111 switch ((fh->size - i - 1) >> 2) {
1112 case 0:
1113 printk(KERN_DEFAULT " %08x\n",
1114 be32_to_cpup(pos));
1115 break;
1116 case 1:
1117 printk(KERN_DEFAULT " %08x %08x\n",
1118 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1119 break;
1120 case 2:
1121 printk(KERN_DEFAULT " %08x %08x %08x\n",
1122 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1123 be32_to_cpup(pos + 2));
1124 break;
1125 default:
1126 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1127 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1128 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1129 }
1130 }
1131 }
1132 #endif
1133
1134 /**
1135 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1136 * @inode - pointer to inode
1137 * @fattr - attributes
1138 *
1139 * Attempt to divine whether or not an RPC call reply carrying stale
1140 * attributes got scheduled after another call carrying updated ones.
1141 *
1142 * To do so, the function first assumes that a more recent ctime means
1143 * that the attributes in fattr are newer, however it also attempt to
1144 * catch the case where ctime either didn't change, or went backwards
1145 * (if someone reset the clock on the server) by looking at whether
1146 * or not this RPC call was started after the inode was last updated.
1147 * Note also the check for wraparound of 'attr_gencount'
1148 *
1149 * The function returns 'true' if it thinks the attributes in 'fattr' are
1150 * more recent than the ones cached in the inode.
1151 *
1152 */
1153 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1154 {
1155 const struct nfs_inode *nfsi = NFS_I(inode);
1156
1157 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1158 nfs_ctime_need_update(inode, fattr) ||
1159 nfs_size_need_update(inode, fattr) ||
1160 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1161 }
1162
1163 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1164 {
1165 if (nfs_inode_attrs_need_update(inode, fattr))
1166 return nfs_update_inode(inode, fattr);
1167 return nfs_check_inode_attributes(inode, fattr);
1168 }
1169
1170 /**
1171 * nfs_refresh_inode - try to update the inode attribute cache
1172 * @inode - pointer to inode
1173 * @fattr - updated attributes
1174 *
1175 * Check that an RPC call that returned attributes has not overlapped with
1176 * other recent updates of the inode metadata, then decide whether it is
1177 * safe to do a full update of the inode attributes, or whether just to
1178 * call nfs_check_inode_attributes.
1179 */
1180 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1181 {
1182 int status;
1183
1184 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1185 return 0;
1186 spin_lock(&inode->i_lock);
1187 status = nfs_refresh_inode_locked(inode, fattr);
1188 spin_unlock(&inode->i_lock);
1189
1190 return status;
1191 }
1192 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1193
1194 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1195 {
1196 struct nfs_inode *nfsi = NFS_I(inode);
1197
1198 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1199 if (S_ISDIR(inode->i_mode))
1200 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1201 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1202 return 0;
1203 return nfs_refresh_inode_locked(inode, fattr);
1204 }
1205
1206 /**
1207 * nfs_post_op_update_inode - try to update the inode attribute cache
1208 * @inode - pointer to inode
1209 * @fattr - updated attributes
1210 *
1211 * After an operation that has changed the inode metadata, mark the
1212 * attribute cache as being invalid, then try to update it.
1213 *
1214 * NB: if the server didn't return any post op attributes, this
1215 * function will force the retrieval of attributes before the next
1216 * NFS request. Thus it should be used only for operations that
1217 * are expected to change one or more attributes, to avoid
1218 * unnecessary NFS requests and trips through nfs_update_inode().
1219 */
1220 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1221 {
1222 int status;
1223
1224 spin_lock(&inode->i_lock);
1225 status = nfs_post_op_update_inode_locked(inode, fattr);
1226 spin_unlock(&inode->i_lock);
1227 return status;
1228 }
1229 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1230
1231 /**
1232 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1233 * @inode - pointer to inode
1234 * @fattr - updated attributes
1235 *
1236 * After an operation that has changed the inode metadata, mark the
1237 * attribute cache as being invalid, then try to update it. Fake up
1238 * weak cache consistency data, if none exist.
1239 *
1240 * This function is mainly designed to be used by the ->write_done() functions.
1241 */
1242 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1243 {
1244 int status;
1245
1246 spin_lock(&inode->i_lock);
1247 /* Don't do a WCC update if these attributes are already stale */
1248 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1249 !nfs_inode_attrs_need_update(inode, fattr)) {
1250 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1251 | NFS_ATTR_FATTR_PRESIZE
1252 | NFS_ATTR_FATTR_PREMTIME
1253 | NFS_ATTR_FATTR_PRECTIME);
1254 goto out_noforce;
1255 }
1256 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1257 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1258 fattr->pre_change_attr = inode->i_version;
1259 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1260 }
1261 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1262 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1263 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1264 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1265 }
1266 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1267 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1268 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1269 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1270 }
1271 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1272 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1273 fattr->pre_size = i_size_read(inode);
1274 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1275 }
1276 out_noforce:
1277 status = nfs_post_op_update_inode_locked(inode, fattr);
1278 spin_unlock(&inode->i_lock);
1279 return status;
1280 }
1281 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1282
1283 /*
1284 * Many nfs protocol calls return the new file attributes after
1285 * an operation. Here we update the inode to reflect the state
1286 * of the server's inode.
1287 *
1288 * This is a bit tricky because we have to make sure all dirty pages
1289 * have been sent off to the server before calling invalidate_inode_pages.
1290 * To make sure no other process adds more write requests while we try
1291 * our best to flush them, we make them sleep during the attribute refresh.
1292 *
1293 * A very similar scenario holds for the dir cache.
1294 */
1295 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1296 {
1297 struct nfs_server *server;
1298 struct nfs_inode *nfsi = NFS_I(inode);
1299 loff_t cur_isize, new_isize;
1300 unsigned long invalid = 0;
1301 unsigned long now = jiffies;
1302 unsigned long save_cache_validity;
1303
1304 dfprintk(VFS, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n",
1305 __func__, inode->i_sb->s_id, inode->i_ino,
1306 nfs_display_fhandle_hash(NFS_FH(inode)),
1307 atomic_read(&inode->i_count), fattr->valid);
1308
1309 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1310 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1311 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1312 NFS_SERVER(inode)->nfs_client->cl_hostname,
1313 inode->i_sb->s_id, (long long)nfsi->fileid,
1314 (long long)fattr->fileid);
1315 goto out_err;
1316 }
1317
1318 /*
1319 * Make sure the inode's type hasn't changed.
1320 */
1321 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1322 /*
1323 * Big trouble! The inode has become a different object.
1324 */
1325 printk(KERN_DEBUG "NFS: %s: inode %ld mode changed, %07o to %07o\n",
1326 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1327 goto out_err;
1328 }
1329
1330 server = NFS_SERVER(inode);
1331 /* Update the fsid? */
1332 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1333 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1334 !IS_AUTOMOUNT(inode))
1335 server->fsid = fattr->fsid;
1336
1337 /*
1338 * Update the read time so we don't revalidate too often.
1339 */
1340 nfsi->read_cache_jiffies = fattr->time_start;
1341
1342 save_cache_validity = nfsi->cache_validity;
1343 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1344 | NFS_INO_INVALID_ATIME
1345 | NFS_INO_REVAL_FORCED
1346 | NFS_INO_REVAL_PAGECACHE);
1347
1348 /* Do atomic weak cache consistency updates */
1349 invalid |= nfs_wcc_update_inode(inode, fattr);
1350
1351 /* More cache consistency checks */
1352 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1353 if (inode->i_version != fattr->change_attr) {
1354 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1355 inode->i_sb->s_id, inode->i_ino);
1356 invalid |= NFS_INO_INVALID_ATTR
1357 | NFS_INO_INVALID_DATA
1358 | NFS_INO_INVALID_ACCESS
1359 | NFS_INO_INVALID_ACL
1360 | NFS_INO_REVAL_PAGECACHE;
1361 if (S_ISDIR(inode->i_mode))
1362 nfs_force_lookup_revalidate(inode);
1363 inode->i_version = fattr->change_attr;
1364 }
1365 } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1366 invalid |= save_cache_validity;
1367
1368 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1369 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1370 } else if (server->caps & NFS_CAP_MTIME)
1371 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1372 | NFS_INO_REVAL_FORCED);
1373
1374 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1375 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1376 } else if (server->caps & NFS_CAP_CTIME)
1377 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1378 | NFS_INO_REVAL_FORCED);
1379
1380 /* Check if our cached file size is stale */
1381 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1382 new_isize = nfs_size_to_loff_t(fattr->size);
1383 cur_isize = i_size_read(inode);
1384 if (new_isize != cur_isize) {
1385 /* Do we perhaps have any outstanding writes, or has
1386 * the file grown beyond our last write? */
1387 if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) ||
1388 new_isize > cur_isize) {
1389 i_size_write(inode, new_isize);
1390 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1391 }
1392 dprintk("NFS: isize change on server for file %s/%ld "
1393 "(%Ld to %Ld)\n",
1394 inode->i_sb->s_id,
1395 inode->i_ino,
1396 (long long)cur_isize,
1397 (long long)new_isize);
1398 }
1399 } else
1400 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1401 | NFS_INO_REVAL_PAGECACHE
1402 | NFS_INO_REVAL_FORCED);
1403
1404
1405 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1406 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1407 else if (server->caps & NFS_CAP_ATIME)
1408 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME
1409 | NFS_INO_REVAL_FORCED);
1410
1411 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1412 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1413 umode_t newmode = inode->i_mode & S_IFMT;
1414 newmode |= fattr->mode & S_IALLUGO;
1415 inode->i_mode = newmode;
1416 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1417 }
1418 } else if (server->caps & NFS_CAP_MODE)
1419 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1420 | NFS_INO_INVALID_ACCESS
1421 | NFS_INO_INVALID_ACL
1422 | NFS_INO_REVAL_FORCED);
1423
1424 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1425 if (inode->i_uid != fattr->uid) {
1426 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1427 inode->i_uid = fattr->uid;
1428 }
1429 } else if (server->caps & NFS_CAP_OWNER)
1430 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1431 | NFS_INO_INVALID_ACCESS
1432 | NFS_INO_INVALID_ACL
1433 | NFS_INO_REVAL_FORCED);
1434
1435 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1436 if (inode->i_gid != fattr->gid) {
1437 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1438 inode->i_gid = fattr->gid;
1439 }
1440 } else if (server->caps & NFS_CAP_OWNER_GROUP)
1441 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1442 | NFS_INO_INVALID_ACCESS
1443 | NFS_INO_INVALID_ACL
1444 | NFS_INO_REVAL_FORCED);
1445
1446 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1447 if (inode->i_nlink != fattr->nlink) {
1448 invalid |= NFS_INO_INVALID_ATTR;
1449 if (S_ISDIR(inode->i_mode))
1450 invalid |= NFS_INO_INVALID_DATA;
1451 set_nlink(inode, fattr->nlink);
1452 }
1453 } else if (server->caps & NFS_CAP_NLINK)
1454 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1455 | NFS_INO_REVAL_FORCED);
1456
1457 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1458 /*
1459 * report the blocks in 512byte units
1460 */
1461 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1462 }
1463 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1464 inode->i_blocks = fattr->du.nfs2.blocks;
1465
1466 /* Update attrtimeo value if we're out of the unstable period */
1467 if (invalid & NFS_INO_INVALID_ATTR) {
1468 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1469 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1470 nfsi->attrtimeo_timestamp = now;
1471 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1472 } else {
1473 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1474 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1475 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1476 nfsi->attrtimeo_timestamp = now;
1477 }
1478 }
1479 invalid &= ~NFS_INO_INVALID_ATTR;
1480 /* Don't invalidate the data if we were to blame */
1481 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1482 || S_ISLNK(inode->i_mode)))
1483 invalid &= ~NFS_INO_INVALID_DATA;
1484 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1485 (save_cache_validity & NFS_INO_REVAL_FORCED))
1486 nfsi->cache_validity |= invalid;
1487
1488 return 0;
1489 out_err:
1490 /*
1491 * No need to worry about unhashing the dentry, as the
1492 * lookup validation will know that the inode is bad.
1493 * (But we fall through to invalidate the caches.)
1494 */
1495 nfs_invalidate_inode(inode);
1496 return -ESTALE;
1497 }
1498
1499 struct inode *nfs_alloc_inode(struct super_block *sb)
1500 {
1501 struct nfs_inode *nfsi;
1502 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1503 if (!nfsi)
1504 return NULL;
1505 nfsi->flags = 0UL;
1506 nfsi->cache_validity = 0UL;
1507 #ifdef CONFIG_NFS_V3_ACL
1508 nfsi->acl_access = ERR_PTR(-EAGAIN);
1509 nfsi->acl_default = ERR_PTR(-EAGAIN);
1510 #endif
1511 #if IS_ENABLED(CONFIG_NFS_V4)
1512 nfsi->nfs4_acl = NULL;
1513 #endif /* CONFIG_NFS_V4 */
1514 return &nfsi->vfs_inode;
1515 }
1516 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1517
1518 static void nfs_i_callback(struct rcu_head *head)
1519 {
1520 struct inode *inode = container_of(head, struct inode, i_rcu);
1521 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1522 }
1523
1524 void nfs_destroy_inode(struct inode *inode)
1525 {
1526 call_rcu(&inode->i_rcu, nfs_i_callback);
1527 }
1528 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1529
1530 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1531 {
1532 #if IS_ENABLED(CONFIG_NFS_V4)
1533 INIT_LIST_HEAD(&nfsi->open_states);
1534 nfsi->delegation = NULL;
1535 nfsi->delegation_state = 0;
1536 init_rwsem(&nfsi->rwsem);
1537 nfsi->layout = NULL;
1538 #endif
1539 }
1540
1541 static void init_once(void *foo)
1542 {
1543 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1544
1545 inode_init_once(&nfsi->vfs_inode);
1546 INIT_LIST_HEAD(&nfsi->open_files);
1547 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1548 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1549 INIT_LIST_HEAD(&nfsi->commit_info.list);
1550 nfsi->npages = 0;
1551 nfsi->commit_info.ncommit = 0;
1552 atomic_set(&nfsi->commit_info.rpcs_out, 0);
1553 atomic_set(&nfsi->silly_count, 1);
1554 INIT_HLIST_HEAD(&nfsi->silly_list);
1555 init_waitqueue_head(&nfsi->waitqueue);
1556 nfs4_init_once(nfsi);
1557 }
1558
1559 static int __init nfs_init_inodecache(void)
1560 {
1561 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1562 sizeof(struct nfs_inode),
1563 0, (SLAB_RECLAIM_ACCOUNT|
1564 SLAB_MEM_SPREAD),
1565 init_once);
1566 if (nfs_inode_cachep == NULL)
1567 return -ENOMEM;
1568
1569 return 0;
1570 }
1571
1572 static void nfs_destroy_inodecache(void)
1573 {
1574 /*
1575 * Make sure all delayed rcu free inodes are flushed before we
1576 * destroy cache.
1577 */
1578 rcu_barrier();
1579 kmem_cache_destroy(nfs_inode_cachep);
1580 }
1581
1582 struct workqueue_struct *nfsiod_workqueue;
1583 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1584
1585 /*
1586 * start up the nfsiod workqueue
1587 */
1588 static int nfsiod_start(void)
1589 {
1590 struct workqueue_struct *wq;
1591 dprintk("RPC: creating workqueue nfsiod\n");
1592 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1593 if (wq == NULL)
1594 return -ENOMEM;
1595 nfsiod_workqueue = wq;
1596 return 0;
1597 }
1598
1599 /*
1600 * Destroy the nfsiod workqueue
1601 */
1602 static void nfsiod_stop(void)
1603 {
1604 struct workqueue_struct *wq;
1605
1606 wq = nfsiod_workqueue;
1607 if (wq == NULL)
1608 return;
1609 nfsiod_workqueue = NULL;
1610 destroy_workqueue(wq);
1611 }
1612
1613 int nfs_net_id;
1614 EXPORT_SYMBOL_GPL(nfs_net_id);
1615
1616 static int nfs_net_init(struct net *net)
1617 {
1618 nfs_clients_init(net);
1619 return nfs_dns_resolver_cache_init(net);
1620 }
1621
1622 static void nfs_net_exit(struct net *net)
1623 {
1624 nfs_dns_resolver_cache_destroy(net);
1625 nfs_cleanup_cb_ident_idr(net);
1626 }
1627
1628 static struct pernet_operations nfs_net_ops = {
1629 .init = nfs_net_init,
1630 .exit = nfs_net_exit,
1631 .id = &nfs_net_id,
1632 .size = sizeof(struct nfs_net),
1633 };
1634
1635 /*
1636 * Initialize NFS
1637 */
1638 static int __init init_nfs_fs(void)
1639 {
1640 int err;
1641
1642 err = nfs_dns_resolver_init();
1643 if (err < 0)
1644 goto out10;;
1645
1646 err = register_pernet_subsys(&nfs_net_ops);
1647 if (err < 0)
1648 goto out9;
1649
1650 err = nfs_fscache_register();
1651 if (err < 0)
1652 goto out8;
1653
1654 err = nfsiod_start();
1655 if (err)
1656 goto out7;
1657
1658 err = nfs_fs_proc_init();
1659 if (err)
1660 goto out6;
1661
1662 err = nfs_init_nfspagecache();
1663 if (err)
1664 goto out5;
1665
1666 err = nfs_init_inodecache();
1667 if (err)
1668 goto out4;
1669
1670 err = nfs_init_readpagecache();
1671 if (err)
1672 goto out3;
1673
1674 err = nfs_init_writepagecache();
1675 if (err)
1676 goto out2;
1677
1678 err = nfs_init_directcache();
1679 if (err)
1680 goto out1;
1681
1682 #ifdef CONFIG_PROC_FS
1683 rpc_proc_register(&init_net, &nfs_rpcstat);
1684 #endif
1685 if ((err = register_nfs_fs()) != 0)
1686 goto out0;
1687
1688 return 0;
1689 out0:
1690 #ifdef CONFIG_PROC_FS
1691 rpc_proc_unregister(&init_net, "nfs");
1692 #endif
1693 nfs_destroy_directcache();
1694 out1:
1695 nfs_destroy_writepagecache();
1696 out2:
1697 nfs_destroy_readpagecache();
1698 out3:
1699 nfs_destroy_inodecache();
1700 out4:
1701 nfs_destroy_nfspagecache();
1702 out5:
1703 nfs_fs_proc_exit();
1704 out6:
1705 nfsiod_stop();
1706 out7:
1707 nfs_fscache_unregister();
1708 out8:
1709 unregister_pernet_subsys(&nfs_net_ops);
1710 out9:
1711 nfs_dns_resolver_destroy();
1712 out10:
1713 return err;
1714 }
1715
1716 static void __exit exit_nfs_fs(void)
1717 {
1718 nfs_destroy_directcache();
1719 nfs_destroy_writepagecache();
1720 nfs_destroy_readpagecache();
1721 nfs_destroy_inodecache();
1722 nfs_destroy_nfspagecache();
1723 nfs_fscache_unregister();
1724 unregister_pernet_subsys(&nfs_net_ops);
1725 nfs_dns_resolver_destroy();
1726 #ifdef CONFIG_PROC_FS
1727 rpc_proc_unregister(&init_net, "nfs");
1728 #endif
1729 unregister_nfs_fs();
1730 nfs_fs_proc_exit();
1731 nfsiod_stop();
1732 }
1733
1734 /* Not quite true; I just maintain it */
1735 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1736 MODULE_LICENSE("GPL");
1737 module_param(enable_ino64, bool, 0644);
1738
1739 module_init(init_nfs_fs)
1740 module_exit(exit_nfs_fs)
CJK support for tty framebuffer vt