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