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ARM: rockchip: fix broken build
[linux/fpc-iii.git] / fs / nfs / inode.c
blob0adc7d245b3dd838e32371920e23d9dda5071ee0
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 int nfs_sync_inode(struct inode *inode)
137 {
138 nfs_inode_dio_wait(inode);
139 return nfs_wb_all(inode);
140 }
141 EXPORT_SYMBOL_GPL(nfs_sync_inode);
142
143 /**
144 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
145 */
146 int nfs_sync_mapping(struct address_space *mapping)
147 {
148 int ret = 0;
149
150 if (mapping->nrpages != 0) {
151 unmap_mapping_range(mapping, 0, 0, 0);
152 ret = nfs_wb_all(mapping->host);
153 }
154 return ret;
155 }
156
157 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
158 {
159 struct nfs_inode *nfsi = NFS_I(inode);
160
161 if (inode->i_mapping->nrpages == 0)
162 flags &= ~NFS_INO_INVALID_DATA;
163 nfsi->cache_validity |= flags;
164 if (flags & NFS_INO_INVALID_DATA)
165 nfs_fscache_invalidate(inode);
166 }
167
168 /*
169 * Invalidate the local caches
170 */
171 static void nfs_zap_caches_locked(struct inode *inode)
172 {
173 struct nfs_inode *nfsi = NFS_I(inode);
174 int mode = inode->i_mode;
175
176 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
177
178 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
179 nfsi->attrtimeo_timestamp = jiffies;
180
181 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
182 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
183 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
184 | NFS_INO_INVALID_DATA
185 | NFS_INO_INVALID_ACCESS
186 | NFS_INO_INVALID_ACL
187 | NFS_INO_REVAL_PAGECACHE);
188 } else
189 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
190 | NFS_INO_INVALID_ACCESS
191 | NFS_INO_INVALID_ACL
192 | NFS_INO_REVAL_PAGECACHE);
193 nfs_zap_label_cache_locked(nfsi);
194 }
195
196 void nfs_zap_caches(struct inode *inode)
197 {
198 spin_lock(&inode->i_lock);
199 nfs_zap_caches_locked(inode);
200 spin_unlock(&inode->i_lock);
201 }
202
203 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
204 {
205 if (mapping->nrpages != 0) {
206 spin_lock(&inode->i_lock);
207 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
208 spin_unlock(&inode->i_lock);
209 }
210 }
211
212 void nfs_zap_acl_cache(struct inode *inode)
213 {
214 void (*clear_acl_cache)(struct inode *);
215
216 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
217 if (clear_acl_cache != NULL)
218 clear_acl_cache(inode);
219 spin_lock(&inode->i_lock);
220 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
221 spin_unlock(&inode->i_lock);
222 }
223 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
224
225 void nfs_invalidate_atime(struct inode *inode)
226 {
227 spin_lock(&inode->i_lock);
228 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
229 spin_unlock(&inode->i_lock);
230 }
231 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
232
233 /*
234 * Invalidate, but do not unhash, the inode.
235 * NB: must be called with inode->i_lock held!
236 */
237 static void nfs_invalidate_inode(struct inode *inode)
238 {
239 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
240 nfs_zap_caches_locked(inode);
241 }
242
243 struct nfs_find_desc {
244 struct nfs_fh *fh;
245 struct nfs_fattr *fattr;
246 };
247
248 /*
249 * In NFSv3 we can have 64bit inode numbers. In order to support
250 * this, and re-exported directories (also seen in NFSv2)
251 * we are forced to allow 2 different inodes to have the same
252 * i_ino.
253 */
254 static int
255 nfs_find_actor(struct inode *inode, void *opaque)
256 {
257 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
258 struct nfs_fh *fh = desc->fh;
259 struct nfs_fattr *fattr = desc->fattr;
260
261 if (NFS_FILEID(inode) != fattr->fileid)
262 return 0;
263 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
264 return 0;
265 if (nfs_compare_fh(NFS_FH(inode), fh))
266 return 0;
267 if (is_bad_inode(inode) || NFS_STALE(inode))
268 return 0;
269 return 1;
270 }
271
272 static int
273 nfs_init_locked(struct inode *inode, void *opaque)
274 {
275 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
276 struct nfs_fattr *fattr = desc->fattr;
277
278 set_nfs_fileid(inode, fattr->fileid);
279 nfs_copy_fh(NFS_FH(inode), desc->fh);
280 return 0;
281 }
282
283 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
284 static void nfs_clear_label_invalid(struct inode *inode)
285 {
286 spin_lock(&inode->i_lock);
287 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
288 spin_unlock(&inode->i_lock);
289 }
290
291 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
292 struct nfs4_label *label)
293 {
294 int error;
295
296 if (label == NULL)
297 return;
298
299 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
300 error = security_inode_notifysecctx(inode, label->label,
301 label->len);
302 if (error)
303 printk(KERN_ERR "%s() %s %d "
304 "security_inode_notifysecctx() %d\n",
305 __func__,
306 (char *)label->label,
307 label->len, error);
308 nfs_clear_label_invalid(inode);
309 }
310 }
311
312 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
313 {
314 struct nfs4_label *label = NULL;
315 int minor_version = server->nfs_client->cl_minorversion;
316
317 if (minor_version < 2)
318 return label;
319
320 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
321 return label;
322
323 label = kzalloc(sizeof(struct nfs4_label), flags);
324 if (label == NULL)
325 return ERR_PTR(-ENOMEM);
326
327 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
328 if (label->label == NULL) {
329 kfree(label);
330 return ERR_PTR(-ENOMEM);
331 }
332 label->len = NFS4_MAXLABELLEN;
333
334 return label;
335 }
336 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
337 #else
338 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
339 struct nfs4_label *label)
340 {
341 }
342 #endif
343 EXPORT_SYMBOL_GPL(nfs_setsecurity);
344
345 /*
346 * This is our front-end to iget that looks up inodes by file handle
347 * instead of inode number.
348 */
349 struct inode *
350 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
351 {
352 struct nfs_find_desc desc = {
353 .fh = fh,
354 .fattr = fattr
355 };
356 struct inode *inode = ERR_PTR(-ENOENT);
357 unsigned long hash;
358
359 nfs_attr_check_mountpoint(sb, fattr);
360
361 if (nfs_attr_use_mounted_on_fileid(fattr))
362 fattr->fileid = fattr->mounted_on_fileid;
363 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
364 goto out_no_inode;
365 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
366 goto out_no_inode;
367
368 hash = nfs_fattr_to_ino_t(fattr);
369
370 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
371 if (inode == NULL) {
372 inode = ERR_PTR(-ENOMEM);
373 goto out_no_inode;
374 }
375
376 if (inode->i_state & I_NEW) {
377 struct nfs_inode *nfsi = NFS_I(inode);
378 unsigned long now = jiffies;
379
380 /* We set i_ino for the few things that still rely on it,
381 * such as stat(2) */
382 inode->i_ino = hash;
383
384 /* We can't support update_atime(), since the server will reset it */
385 inode->i_flags |= S_NOATIME|S_NOCMTIME;
386 inode->i_mode = fattr->mode;
387 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
388 && nfs_server_capable(inode, NFS_CAP_MODE))
389 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
390 /* Why so? Because we want revalidate for devices/FIFOs, and
391 * that's precisely what we have in nfs_file_inode_operations.
392 */
393 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
394 if (S_ISREG(inode->i_mode)) {
395 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
396 inode->i_data.a_ops = &nfs_file_aops;
397 } else if (S_ISDIR(inode->i_mode)) {
398 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
399 inode->i_fop = &nfs_dir_operations;
400 inode->i_data.a_ops = &nfs_dir_aops;
401 /* Deal with crossing mountpoints */
402 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
403 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
404 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
405 inode->i_op = &nfs_referral_inode_operations;
406 else
407 inode->i_op = &nfs_mountpoint_inode_operations;
408 inode->i_fop = NULL;
409 inode->i_flags |= S_AUTOMOUNT;
410 }
411 } else if (S_ISLNK(inode->i_mode))
412 inode->i_op = &nfs_symlink_inode_operations;
413 else
414 init_special_inode(inode, inode->i_mode, fattr->rdev);
415
416 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
417 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
418 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
419 inode->i_version = 0;
420 inode->i_size = 0;
421 clear_nlink(inode);
422 inode->i_uid = make_kuid(&init_user_ns, -2);
423 inode->i_gid = make_kgid(&init_user_ns, -2);
424 inode->i_blocks = 0;
425 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
426 nfsi->write_io = 0;
427 nfsi->read_io = 0;
428
429 nfsi->read_cache_jiffies = fattr->time_start;
430 nfsi->attr_gencount = fattr->gencount;
431 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
432 inode->i_atime = fattr->atime;
433 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
434 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
435 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
436 inode->i_mtime = fattr->mtime;
437 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
438 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
439 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
440 inode->i_ctime = fattr->ctime;
441 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
442 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
443 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
444 inode->i_version = fattr->change_attr;
445 else
446 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
447 | NFS_INO_REVAL_PAGECACHE);
448 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
449 inode->i_size = nfs_size_to_loff_t(fattr->size);
450 else
451 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
452 | NFS_INO_REVAL_PAGECACHE);
453 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
454 set_nlink(inode, fattr->nlink);
455 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
456 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
457 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
458 inode->i_uid = fattr->uid;
459 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
460 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
461 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
462 inode->i_gid = fattr->gid;
463 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
464 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
465 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
466 inode->i_blocks = fattr->du.nfs2.blocks;
467 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
468 /*
469 * report the blocks in 512byte units
470 */
471 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
472 }
473
474 nfs_setsecurity(inode, fattr, label);
475
476 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
477 nfsi->attrtimeo_timestamp = now;
478 nfsi->access_cache = RB_ROOT;
479
480 nfs_fscache_init_inode(inode);
481
482 unlock_new_inode(inode);
483 } else
484 nfs_refresh_inode(inode, fattr);
485 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
486 inode->i_sb->s_id,
487 (unsigned long long)NFS_FILEID(inode),
488 nfs_display_fhandle_hash(fh),
489 atomic_read(&inode->i_count));
490
491 out:
492 return inode;
493
494 out_no_inode:
495 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
496 goto out;
497 }
498 EXPORT_SYMBOL_GPL(nfs_fhget);
499
500 #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)
501
502 int
503 nfs_setattr(struct dentry *dentry, struct iattr *attr)
504 {
505 struct inode *inode = d_inode(dentry);
506 struct nfs_fattr *fattr;
507 int error = -ENOMEM;
508
509 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
510
511 /* skip mode change if it's just for clearing setuid/setgid */
512 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
513 attr->ia_valid &= ~ATTR_MODE;
514
515 if (attr->ia_valid & ATTR_SIZE) {
516 loff_t i_size;
517
518 BUG_ON(!S_ISREG(inode->i_mode));
519
520 i_size = i_size_read(inode);
521 if (attr->ia_size == i_size)
522 attr->ia_valid &= ~ATTR_SIZE;
523 else if (attr->ia_size < i_size && IS_SWAPFILE(inode))
524 return -ETXTBSY;
525 }
526
527 /* Optimization: if the end result is no change, don't RPC */
528 attr->ia_valid &= NFS_VALID_ATTRS;
529 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
530 return 0;
531
532 trace_nfs_setattr_enter(inode);
533
534 /* Write all dirty data */
535 if (S_ISREG(inode->i_mode))
536 nfs_sync_inode(inode);
537
538 fattr = nfs_alloc_fattr();
539 if (fattr == NULL)
540 goto out;
541 /*
542 * Return any delegations if we're going to change ACLs
543 */
544 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
545 NFS_PROTO(inode)->return_delegation(inode);
546 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
547 if (error == 0)
548 error = nfs_refresh_inode(inode, fattr);
549 nfs_free_fattr(fattr);
550 out:
551 trace_nfs_setattr_exit(inode, error);
552 return error;
553 }
554 EXPORT_SYMBOL_GPL(nfs_setattr);
555
556 /**
557 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
558 * @inode: inode of the file used
559 * @offset: file offset to start truncating
560 *
561 * This is a copy of the common vmtruncate, but with the locking
562 * corrected to take into account the fact that NFS requires
563 * inode->i_size to be updated under the inode->i_lock.
564 * Note: must be called with inode->i_lock held!
565 */
566 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
567 {
568 int err;
569
570 err = inode_newsize_ok(inode, offset);
571 if (err)
572 goto out;
573
574 i_size_write(inode, offset);
575 /* Optimisation */
576 if (offset == 0)
577 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
578
579 spin_unlock(&inode->i_lock);
580 truncate_pagecache(inode, offset);
581 spin_lock(&inode->i_lock);
582 out:
583 return err;
584 }
585
586 /**
587 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
588 * @inode: pointer to struct inode
589 * @attr: pointer to struct iattr
590 *
591 * Note: we do this in the *proc.c in order to ensure that
592 * it works for things like exclusive creates too.
593 */
594 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
595 struct nfs_fattr *fattr)
596 {
597 /* Barrier: bump the attribute generation count. */
598 nfs_fattr_set_barrier(fattr);
599
600 spin_lock(&inode->i_lock);
601 NFS_I(inode)->attr_gencount = fattr->gencount;
602 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
603 if ((attr->ia_valid & ATTR_MODE) != 0) {
604 int mode = attr->ia_mode & S_IALLUGO;
605 mode |= inode->i_mode & ~S_IALLUGO;
606 inode->i_mode = mode;
607 }
608 if ((attr->ia_valid & ATTR_UID) != 0)
609 inode->i_uid = attr->ia_uid;
610 if ((attr->ia_valid & ATTR_GID) != 0)
611 inode->i_gid = attr->ia_gid;
612 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
613 | NFS_INO_INVALID_ACL);
614 }
615 if ((attr->ia_valid & ATTR_SIZE) != 0) {
616 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
617 nfs_vmtruncate(inode, attr->ia_size);
618 }
619 nfs_update_inode(inode, fattr);
620 spin_unlock(&inode->i_lock);
621 }
622 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
623
624 static void nfs_request_parent_use_readdirplus(struct dentry *dentry)
625 {
626 struct dentry *parent;
627
628 parent = dget_parent(dentry);
629 nfs_force_use_readdirplus(d_inode(parent));
630 dput(parent);
631 }
632
633 static bool nfs_need_revalidate_inode(struct inode *inode)
634 {
635 if (NFS_I(inode)->cache_validity &
636 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
637 return true;
638 if (nfs_attribute_cache_expired(inode))
639 return true;
640 return false;
641 }
642
643 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
644 {
645 struct inode *inode = d_inode(dentry);
646 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
647 int err = 0;
648
649 trace_nfs_getattr_enter(inode);
650 /* Flush out writes to the server in order to update c/mtime. */
651 if (S_ISREG(inode->i_mode)) {
652 mutex_lock(&inode->i_mutex);
653 err = nfs_sync_inode(inode);
654 mutex_unlock(&inode->i_mutex);
655 if (err)
656 goto out;
657 }
658
659 /*
660 * We may force a getattr if the user cares about atime.
661 *
662 * Note that we only have to check the vfsmount flags here:
663 * - NFS always sets S_NOATIME by so checking it would give a
664 * bogus result
665 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
666 * no point in checking those.
667 */
668 if ((mnt->mnt_flags & MNT_NOATIME) ||
669 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
670 need_atime = 0;
671
672 if (need_atime || nfs_need_revalidate_inode(inode)) {
673 struct nfs_server *server = NFS_SERVER(inode);
674
675 if (server->caps & NFS_CAP_READDIRPLUS)
676 nfs_request_parent_use_readdirplus(dentry);
677 err = __nfs_revalidate_inode(server, inode);
678 }
679 if (!err) {
680 generic_fillattr(inode, stat);
681 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
682 if (S_ISDIR(inode->i_mode))
683 stat->blksize = NFS_SERVER(inode)->dtsize;
684 }
685 out:
686 trace_nfs_getattr_exit(inode, err);
687 return err;
688 }
689 EXPORT_SYMBOL_GPL(nfs_getattr);
690
691 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
692 {
693 atomic_set(&l_ctx->count, 1);
694 l_ctx->lockowner.l_owner = current->files;
695 l_ctx->lockowner.l_pid = current->tgid;
696 INIT_LIST_HEAD(&l_ctx->list);
697 nfs_iocounter_init(&l_ctx->io_count);
698 }
699
700 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
701 {
702 struct nfs_lock_context *head = &ctx->lock_context;
703 struct nfs_lock_context *pos = head;
704
705 do {
706 if (pos->lockowner.l_owner != current->files)
707 continue;
708 if (pos->lockowner.l_pid != current->tgid)
709 continue;
710 atomic_inc(&pos->count);
711 return pos;
712 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
713 return NULL;
714 }
715
716 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
717 {
718 struct nfs_lock_context *res, *new = NULL;
719 struct inode *inode = d_inode(ctx->dentry);
720
721 spin_lock(&inode->i_lock);
722 res = __nfs_find_lock_context(ctx);
723 if (res == NULL) {
724 spin_unlock(&inode->i_lock);
725 new = kmalloc(sizeof(*new), GFP_KERNEL);
726 if (new == NULL)
727 return ERR_PTR(-ENOMEM);
728 nfs_init_lock_context(new);
729 spin_lock(&inode->i_lock);
730 res = __nfs_find_lock_context(ctx);
731 if (res == NULL) {
732 list_add_tail(&new->list, &ctx->lock_context.list);
733 new->open_context = ctx;
734 res = new;
735 new = NULL;
736 }
737 }
738 spin_unlock(&inode->i_lock);
739 kfree(new);
740 return res;
741 }
742 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
743
744 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
745 {
746 struct nfs_open_context *ctx = l_ctx->open_context;
747 struct inode *inode = d_inode(ctx->dentry);
748
749 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
750 return;
751 list_del(&l_ctx->list);
752 spin_unlock(&inode->i_lock);
753 kfree(l_ctx);
754 }
755 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
756
757 /**
758 * nfs_close_context - Common close_context() routine NFSv2/v3
759 * @ctx: pointer to context
760 * @is_sync: is this a synchronous close
761 *
762 * always ensure that the attributes are up to date if we're mounted
763 * with close-to-open semantics
764 */
765 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
766 {
767 struct inode *inode;
768 struct nfs_server *server;
769
770 if (!(ctx->mode & FMODE_WRITE))
771 return;
772 if (!is_sync)
773 return;
774 inode = d_inode(ctx->dentry);
775 if (!list_empty(&NFS_I(inode)->open_files))
776 return;
777 server = NFS_SERVER(inode);
778 if (server->flags & NFS_MOUNT_NOCTO)
779 return;
780 nfs_revalidate_inode(server, inode);
781 }
782 EXPORT_SYMBOL_GPL(nfs_close_context);
783
784 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
785 {
786 struct nfs_open_context *ctx;
787 struct rpc_cred *cred = rpc_lookup_cred();
788 if (IS_ERR(cred))
789 return ERR_CAST(cred);
790
791 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
792 if (!ctx) {
793 put_rpccred(cred);
794 return ERR_PTR(-ENOMEM);
795 }
796 nfs_sb_active(dentry->d_sb);
797 ctx->dentry = dget(dentry);
798 ctx->cred = cred;
799 ctx->state = NULL;
800 ctx->mode = f_mode;
801 ctx->flags = 0;
802 ctx->error = 0;
803 nfs_init_lock_context(&ctx->lock_context);
804 ctx->lock_context.open_context = ctx;
805 INIT_LIST_HEAD(&ctx->list);
806 ctx->mdsthreshold = NULL;
807 return ctx;
808 }
809 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
810
811 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
812 {
813 if (ctx != NULL)
814 atomic_inc(&ctx->lock_context.count);
815 return ctx;
816 }
817 EXPORT_SYMBOL_GPL(get_nfs_open_context);
818
819 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
820 {
821 struct inode *inode = d_inode(ctx->dentry);
822 struct super_block *sb = ctx->dentry->d_sb;
823
824 if (!list_empty(&ctx->list)) {
825 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
826 return;
827 list_del(&ctx->list);
828 spin_unlock(&inode->i_lock);
829 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
830 return;
831 if (inode != NULL)
832 NFS_PROTO(inode)->close_context(ctx, is_sync);
833 if (ctx->cred != NULL)
834 put_rpccred(ctx->cred);
835 dput(ctx->dentry);
836 nfs_sb_deactive(sb);
837 kfree(ctx->mdsthreshold);
838 kfree(ctx);
839 }
840
841 void put_nfs_open_context(struct nfs_open_context *ctx)
842 {
843 __put_nfs_open_context(ctx, 0);
844 }
845 EXPORT_SYMBOL_GPL(put_nfs_open_context);
846
847 /*
848 * Ensure that mmap has a recent RPC credential for use when writing out
849 * shared pages
850 */
851 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
852 {
853 struct inode *inode = d_inode(ctx->dentry);
854 struct nfs_inode *nfsi = NFS_I(inode);
855
856 spin_lock(&inode->i_lock);
857 list_add(&ctx->list, &nfsi->open_files);
858 spin_unlock(&inode->i_lock);
859 }
860 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
861
862 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
863 {
864 filp->private_data = get_nfs_open_context(ctx);
865 if (list_empty(&ctx->list))
866 nfs_inode_attach_open_context(ctx);
867 }
868 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
869
870 /*
871 * Given an inode, search for an open context with the desired characteristics
872 */
873 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
874 {
875 struct nfs_inode *nfsi = NFS_I(inode);
876 struct nfs_open_context *pos, *ctx = NULL;
877
878 spin_lock(&inode->i_lock);
879 list_for_each_entry(pos, &nfsi->open_files, list) {
880 if (cred != NULL && pos->cred != cred)
881 continue;
882 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
883 continue;
884 ctx = get_nfs_open_context(pos);
885 break;
886 }
887 spin_unlock(&inode->i_lock);
888 return ctx;
889 }
890
891 static void nfs_file_clear_open_context(struct file *filp)
892 {
893 struct nfs_open_context *ctx = nfs_file_open_context(filp);
894
895 if (ctx) {
896 struct inode *inode = d_inode(ctx->dentry);
897
898 filp->private_data = NULL;
899 spin_lock(&inode->i_lock);
900 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
901 spin_unlock(&inode->i_lock);
902 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
903 }
904 }
905
906 /*
907 * These allocate and release file read/write context information.
908 */
909 int nfs_open(struct inode *inode, struct file *filp)
910 {
911 struct nfs_open_context *ctx;
912
913 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
914 if (IS_ERR(ctx))
915 return PTR_ERR(ctx);
916 nfs_file_set_open_context(filp, ctx);
917 put_nfs_open_context(ctx);
918 nfs_fscache_open_file(inode, filp);
919 return 0;
920 }
921
922 int nfs_release(struct inode *inode, struct file *filp)
923 {
924 nfs_file_clear_open_context(filp);
925 return 0;
926 }
927
928 /*
929 * This function is called whenever some part of NFS notices that
930 * the cached attributes have to be refreshed.
931 */
932 int
933 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
934 {
935 int status = -ESTALE;
936 struct nfs4_label *label = NULL;
937 struct nfs_fattr *fattr = NULL;
938 struct nfs_inode *nfsi = NFS_I(inode);
939
940 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
941 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
942
943 trace_nfs_revalidate_inode_enter(inode);
944
945 if (is_bad_inode(inode))
946 goto out;
947 if (NFS_STALE(inode))
948 goto out;
949
950 status = -ENOMEM;
951 fattr = nfs_alloc_fattr();
952 if (fattr == NULL)
953 goto out;
954
955 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
956
957 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
958 if (IS_ERR(label)) {
959 status = PTR_ERR(label);
960 goto out;
961 }
962
963 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
964 if (status != 0) {
965 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
966 inode->i_sb->s_id,
967 (unsigned long long)NFS_FILEID(inode), status);
968 if (status == -ESTALE) {
969 nfs_zap_caches(inode);
970 if (!S_ISDIR(inode->i_mode))
971 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
972 }
973 goto err_out;
974 }
975
976 status = nfs_refresh_inode(inode, fattr);
977 if (status) {
978 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
979 inode->i_sb->s_id,
980 (unsigned long long)NFS_FILEID(inode), status);
981 goto err_out;
982 }
983
984 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
985 nfs_zap_acl_cache(inode);
986
987 nfs_setsecurity(inode, fattr, label);
988
989 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
990 inode->i_sb->s_id,
991 (unsigned long long)NFS_FILEID(inode));
992
993 err_out:
994 nfs4_label_free(label);
995 out:
996 nfs_free_fattr(fattr);
997 trace_nfs_revalidate_inode_exit(inode, status);
998 return status;
999 }
1000
1001 int nfs_attribute_timeout(struct inode *inode)
1002 {
1003 struct nfs_inode *nfsi = NFS_I(inode);
1004
1005 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
1006 }
1007
1008 int nfs_attribute_cache_expired(struct inode *inode)
1009 {
1010 if (nfs_have_delegated_attributes(inode))
1011 return 0;
1012 return nfs_attribute_timeout(inode);
1013 }
1014
1015 /**
1016 * nfs_revalidate_inode - Revalidate the inode attributes
1017 * @server - pointer to nfs_server struct
1018 * @inode - pointer to inode struct
1019 *
1020 * Updates inode attribute information by retrieving the data from the server.
1021 */
1022 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1023 {
1024 if (!nfs_need_revalidate_inode(inode))
1025 return NFS_STALE(inode) ? -ESTALE : 0;
1026 return __nfs_revalidate_inode(server, inode);
1027 }
1028 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1029
1030 int nfs_revalidate_inode_rcu(struct nfs_server *server, struct inode *inode)
1031 {
1032 if (!(NFS_I(inode)->cache_validity &
1033 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
1034 && !nfs_attribute_cache_expired(inode))
1035 return NFS_STALE(inode) ? -ESTALE : 0;
1036 return -ECHILD;
1037 }
1038
1039 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1040 {
1041 struct nfs_inode *nfsi = NFS_I(inode);
1042 int ret;
1043
1044 if (mapping->nrpages != 0) {
1045 if (S_ISREG(inode->i_mode)) {
1046 unmap_mapping_range(mapping, 0, 0, 0);
1047 ret = nfs_sync_mapping(mapping);
1048 if (ret < 0)
1049 return ret;
1050 }
1051 ret = invalidate_inode_pages2(mapping);
1052 if (ret < 0)
1053 return ret;
1054 }
1055 if (S_ISDIR(inode->i_mode)) {
1056 spin_lock(&inode->i_lock);
1057 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1058 spin_unlock(&inode->i_lock);
1059 }
1060 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1061 nfs_fscache_wait_on_invalidate(inode);
1062
1063 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1064 inode->i_sb->s_id,
1065 (unsigned long long)NFS_FILEID(inode));
1066 return 0;
1067 }
1068
1069 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1070 {
1071 if (nfs_have_delegated_attributes(inode))
1072 return false;
1073 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
1074 || nfs_attribute_timeout(inode)
1075 || NFS_STALE(inode);
1076 }
1077
1078 /**
1079 * __nfs_revalidate_mapping - Revalidate the pagecache
1080 * @inode - pointer to host inode
1081 * @mapping - pointer to mapping
1082 * @may_lock - take inode->i_mutex?
1083 */
1084 static int __nfs_revalidate_mapping(struct inode *inode,
1085 struct address_space *mapping,
1086 bool may_lock)
1087 {
1088 struct nfs_inode *nfsi = NFS_I(inode);
1089 unsigned long *bitlock = &nfsi->flags;
1090 int ret = 0;
1091
1092 /* swapfiles are not supposed to be shared. */
1093 if (IS_SWAPFILE(inode))
1094 goto out;
1095
1096 if (nfs_mapping_need_revalidate_inode(inode)) {
1097 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1098 if (ret < 0)
1099 goto out;
1100 }
1101
1102 /*
1103 * We must clear NFS_INO_INVALID_DATA first to ensure that
1104 * invalidations that come in while we're shooting down the mappings
1105 * are respected. But, that leaves a race window where one revalidator
1106 * can clear the flag, and then another checks it before the mapping
1107 * gets invalidated. Fix that by serializing access to this part of
1108 * the function.
1109 *
1110 * At the same time, we need to allow other tasks to see whether we
1111 * might be in the middle of invalidating the pages, so we only set
1112 * the bit lock here if it looks like we're going to be doing that.
1113 */
1114 for (;;) {
1115 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1116 nfs_wait_bit_killable, TASK_KILLABLE);
1117 if (ret)
1118 goto out;
1119 spin_lock(&inode->i_lock);
1120 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1121 spin_unlock(&inode->i_lock);
1122 continue;
1123 }
1124 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1125 break;
1126 spin_unlock(&inode->i_lock);
1127 goto out;
1128 }
1129
1130 set_bit(NFS_INO_INVALIDATING, bitlock);
1131 smp_wmb();
1132 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1133 spin_unlock(&inode->i_lock);
1134 trace_nfs_invalidate_mapping_enter(inode);
1135 if (may_lock) {
1136 mutex_lock(&inode->i_mutex);
1137 ret = nfs_invalidate_mapping(inode, mapping);
1138 mutex_unlock(&inode->i_mutex);
1139 } else
1140 ret = nfs_invalidate_mapping(inode, mapping);
1141 trace_nfs_invalidate_mapping_exit(inode, ret);
1142
1143 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1144 smp_mb__after_atomic();
1145 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1146 out:
1147 return ret;
1148 }
1149
1150 /**
1151 * nfs_revalidate_mapping - Revalidate the pagecache
1152 * @inode - pointer to host inode
1153 * @mapping - pointer to mapping
1154 */
1155 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1156 {
1157 return __nfs_revalidate_mapping(inode, mapping, false);
1158 }
1159
1160 /**
1161 * nfs_revalidate_mapping_protected - Revalidate the pagecache
1162 * @inode - pointer to host inode
1163 * @mapping - pointer to mapping
1164 *
1165 * Differs from nfs_revalidate_mapping() in that it grabs the inode->i_mutex
1166 * while invalidating the mapping.
1167 */
1168 int nfs_revalidate_mapping_protected(struct inode *inode, struct address_space *mapping)
1169 {
1170 return __nfs_revalidate_mapping(inode, mapping, true);
1171 }
1172
1173 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1174 {
1175 struct nfs_inode *nfsi = NFS_I(inode);
1176 unsigned long ret = 0;
1177
1178 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1179 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1180 && inode->i_version == fattr->pre_change_attr) {
1181 inode->i_version = fattr->change_attr;
1182 if (S_ISDIR(inode->i_mode))
1183 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1184 ret |= NFS_INO_INVALID_ATTR;
1185 }
1186 /* If we have atomic WCC data, we may update some attributes */
1187 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1188 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1189 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1190 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1191 ret |= NFS_INO_INVALID_ATTR;
1192 }
1193
1194 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1195 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1196 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1197 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1198 if (S_ISDIR(inode->i_mode))
1199 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1200 ret |= NFS_INO_INVALID_ATTR;
1201 }
1202 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1203 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1204 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1205 && nfsi->nrequests == 0) {
1206 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1207 ret |= NFS_INO_INVALID_ATTR;
1208 }
1209
1210 return ret;
1211 }
1212
1213 /**
1214 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1215 * @inode - pointer to inode
1216 * @fattr - updated attributes
1217 *
1218 * Verifies the attribute cache. If we have just changed the attributes,
1219 * so that fattr carries weak cache consistency data, then it may
1220 * also update the ctime/mtime/change_attribute.
1221 */
1222 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1223 {
1224 struct nfs_inode *nfsi = NFS_I(inode);
1225 loff_t cur_size, new_isize;
1226 unsigned long invalid = 0;
1227
1228
1229 if (nfs_have_delegated_attributes(inode))
1230 return 0;
1231 /* Has the inode gone and changed behind our back? */
1232 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1233 return -EIO;
1234 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1235 return -EIO;
1236
1237 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1238 inode->i_version != fattr->change_attr)
1239 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1240
1241 /* Verify a few of the more important attributes */
1242 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1243 invalid |= NFS_INO_INVALID_ATTR;
1244
1245 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1246 cur_size = i_size_read(inode);
1247 new_isize = nfs_size_to_loff_t(fattr->size);
1248 if (cur_size != new_isize)
1249 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1250 }
1251 if (nfsi->nrequests != 0)
1252 invalid &= ~NFS_INO_REVAL_PAGECACHE;
1253
1254 /* Have any file permissions changed? */
1255 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1256 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1257 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1258 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1259 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1260 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1261
1262 /* Has the link count changed? */
1263 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1264 invalid |= NFS_INO_INVALID_ATTR;
1265
1266 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1267 invalid |= NFS_INO_INVALID_ATIME;
1268
1269 if (invalid != 0)
1270 nfs_set_cache_invalid(inode, invalid);
1271
1272 nfsi->read_cache_jiffies = fattr->time_start;
1273 return 0;
1274 }
1275
1276 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1277 {
1278 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1279 return 0;
1280 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1281 }
1282
1283 static atomic_long_t nfs_attr_generation_counter;
1284
1285 static unsigned long nfs_read_attr_generation_counter(void)
1286 {
1287 return atomic_long_read(&nfs_attr_generation_counter);
1288 }
1289
1290 unsigned long nfs_inc_attr_generation_counter(void)
1291 {
1292 return atomic_long_inc_return(&nfs_attr_generation_counter);
1293 }
1294 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1295
1296 void nfs_fattr_init(struct nfs_fattr *fattr)
1297 {
1298 fattr->valid = 0;
1299 fattr->time_start = jiffies;
1300 fattr->gencount = nfs_inc_attr_generation_counter();
1301 fattr->owner_name = NULL;
1302 fattr->group_name = NULL;
1303 }
1304 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1305
1306 /**
1307 * nfs_fattr_set_barrier
1308 * @fattr: attributes
1309 *
1310 * Used to set a barrier after an attribute was updated. This
1311 * barrier ensures that older attributes from RPC calls that may
1312 * have raced with our update cannot clobber these new values.
1313 * Note that you are still responsible for ensuring that other
1314 * operations which change the attribute on the server do not
1315 * collide.
1316 */
1317 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1318 {
1319 fattr->gencount = nfs_inc_attr_generation_counter();
1320 }
1321
1322 struct nfs_fattr *nfs_alloc_fattr(void)
1323 {
1324 struct nfs_fattr *fattr;
1325
1326 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1327 if (fattr != NULL)
1328 nfs_fattr_init(fattr);
1329 return fattr;
1330 }
1331 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1332
1333 struct nfs_fh *nfs_alloc_fhandle(void)
1334 {
1335 struct nfs_fh *fh;
1336
1337 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1338 if (fh != NULL)
1339 fh->size = 0;
1340 return fh;
1341 }
1342 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1343
1344 #ifdef NFS_DEBUG
1345 /*
1346 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1347 * in the same way that wireshark does
1348 *
1349 * @fh: file handle
1350 *
1351 * For debugging only.
1352 */
1353 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1354 {
1355 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1356 * not on the result */
1357 return nfs_fhandle_hash(fh);
1358 }
1359 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1360
1361 /*
1362 * _nfs_display_fhandle - display an NFS file handle on the console
1363 *
1364 * @fh: file handle to display
1365 * @caption: display caption
1366 *
1367 * For debugging only.
1368 */
1369 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1370 {
1371 unsigned short i;
1372
1373 if (fh == NULL || fh->size == 0) {
1374 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1375 return;
1376 }
1377
1378 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1379 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1380 for (i = 0; i < fh->size; i += 16) {
1381 __be32 *pos = (__be32 *)&fh->data[i];
1382
1383 switch ((fh->size - i - 1) >> 2) {
1384 case 0:
1385 printk(KERN_DEFAULT " %08x\n",
1386 be32_to_cpup(pos));
1387 break;
1388 case 1:
1389 printk(KERN_DEFAULT " %08x %08x\n",
1390 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1391 break;
1392 case 2:
1393 printk(KERN_DEFAULT " %08x %08x %08x\n",
1394 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1395 be32_to_cpup(pos + 2));
1396 break;
1397 default:
1398 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1399 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1400 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1401 }
1402 }
1403 }
1404 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1405 #endif
1406
1407 /**
1408 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1409 * @inode - pointer to inode
1410 * @fattr - attributes
1411 *
1412 * Attempt to divine whether or not an RPC call reply carrying stale
1413 * attributes got scheduled after another call carrying updated ones.
1414 *
1415 * To do so, the function first assumes that a more recent ctime means
1416 * that the attributes in fattr are newer, however it also attempt to
1417 * catch the case where ctime either didn't change, or went backwards
1418 * (if someone reset the clock on the server) by looking at whether
1419 * or not this RPC call was started after the inode was last updated.
1420 * Note also the check for wraparound of 'attr_gencount'
1421 *
1422 * The function returns 'true' if it thinks the attributes in 'fattr' are
1423 * more recent than the ones cached in the inode.
1424 *
1425 */
1426 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1427 {
1428 const struct nfs_inode *nfsi = NFS_I(inode);
1429
1430 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1431 nfs_ctime_need_update(inode, fattr) ||
1432 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1433 }
1434
1435 /*
1436 * Don't trust the change_attribute, mtime, ctime or size if
1437 * a pnfs LAYOUTCOMMIT is outstanding
1438 */
1439 static void nfs_inode_attrs_handle_layoutcommit(struct inode *inode,
1440 struct nfs_fattr *fattr)
1441 {
1442 if (pnfs_layoutcommit_outstanding(inode))
1443 fattr->valid &= ~(NFS_ATTR_FATTR_CHANGE |
1444 NFS_ATTR_FATTR_MTIME |
1445 NFS_ATTR_FATTR_CTIME |
1446 NFS_ATTR_FATTR_SIZE);
1447 }
1448
1449 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1450 {
1451 int ret;
1452
1453 trace_nfs_refresh_inode_enter(inode);
1454
1455 nfs_inode_attrs_handle_layoutcommit(inode, fattr);
1456
1457 if (nfs_inode_attrs_need_update(inode, fattr))
1458 ret = nfs_update_inode(inode, fattr);
1459 else
1460 ret = nfs_check_inode_attributes(inode, fattr);
1461
1462 trace_nfs_refresh_inode_exit(inode, ret);
1463 return ret;
1464 }
1465
1466 /**
1467 * nfs_refresh_inode - try to update the inode attribute cache
1468 * @inode - pointer to inode
1469 * @fattr - updated attributes
1470 *
1471 * Check that an RPC call that returned attributes has not overlapped with
1472 * other recent updates of the inode metadata, then decide whether it is
1473 * safe to do a full update of the inode attributes, or whether just to
1474 * call nfs_check_inode_attributes.
1475 */
1476 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1477 {
1478 int status;
1479
1480 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1481 return 0;
1482 spin_lock(&inode->i_lock);
1483 status = nfs_refresh_inode_locked(inode, fattr);
1484 spin_unlock(&inode->i_lock);
1485
1486 return status;
1487 }
1488 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1489
1490 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1491 {
1492 unsigned long invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1493
1494 if (S_ISDIR(inode->i_mode))
1495 invalid |= NFS_INO_INVALID_DATA;
1496 nfs_set_cache_invalid(inode, invalid);
1497 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1498 return 0;
1499 return nfs_refresh_inode_locked(inode, fattr);
1500 }
1501
1502 /**
1503 * nfs_post_op_update_inode - try to update the inode attribute cache
1504 * @inode - pointer to inode
1505 * @fattr - updated attributes
1506 *
1507 * After an operation that has changed the inode metadata, mark the
1508 * attribute cache as being invalid, then try to update it.
1509 *
1510 * NB: if the server didn't return any post op attributes, this
1511 * function will force the retrieval of attributes before the next
1512 * NFS request. Thus it should be used only for operations that
1513 * are expected to change one or more attributes, to avoid
1514 * unnecessary NFS requests and trips through nfs_update_inode().
1515 */
1516 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1517 {
1518 int status;
1519
1520 spin_lock(&inode->i_lock);
1521 nfs_fattr_set_barrier(fattr);
1522 status = nfs_post_op_update_inode_locked(inode, fattr);
1523 spin_unlock(&inode->i_lock);
1524
1525 return status;
1526 }
1527 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1528
1529 /**
1530 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1531 * @inode - pointer to inode
1532 * @fattr - updated attributes
1533 *
1534 * After an operation that has changed the inode metadata, mark the
1535 * attribute cache as being invalid, then try to update it. Fake up
1536 * weak cache consistency data, if none exist.
1537 *
1538 * This function is mainly designed to be used by the ->write_done() functions.
1539 */
1540 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1541 {
1542 int status;
1543
1544 /* Don't do a WCC update if these attributes are already stale */
1545 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1546 !nfs_inode_attrs_need_update(inode, fattr)) {
1547 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1548 | NFS_ATTR_FATTR_PRESIZE
1549 | NFS_ATTR_FATTR_PREMTIME
1550 | NFS_ATTR_FATTR_PRECTIME);
1551 goto out_noforce;
1552 }
1553 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1554 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1555 fattr->pre_change_attr = inode->i_version;
1556 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1557 }
1558 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1559 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1560 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1561 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1562 }
1563 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1564 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1565 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1566 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1567 }
1568 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1569 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1570 fattr->pre_size = i_size_read(inode);
1571 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1572 }
1573 out_noforce:
1574 status = nfs_post_op_update_inode_locked(inode, fattr);
1575 return status;
1576 }
1577
1578 /**
1579 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1580 * @inode - pointer to inode
1581 * @fattr - updated attributes
1582 *
1583 * After an operation that has changed the inode metadata, mark the
1584 * attribute cache as being invalid, then try to update it. Fake up
1585 * weak cache consistency data, if none exist.
1586 *
1587 * This function is mainly designed to be used by the ->write_done() functions.
1588 */
1589 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1590 {
1591 int status;
1592
1593 spin_lock(&inode->i_lock);
1594 nfs_fattr_set_barrier(fattr);
1595 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1596 spin_unlock(&inode->i_lock);
1597 return status;
1598 }
1599 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1600
1601
1602 static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1603 struct nfs_fattr *fattr)
1604 {
1605 bool ret1 = true, ret2 = true;
1606
1607 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1608 ret1 = (nfsi->fileid == fattr->fileid);
1609 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1610 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1611 return ret1 || ret2;
1612 }
1613
1614 /*
1615 * Many nfs protocol calls return the new file attributes after
1616 * an operation. Here we update the inode to reflect the state
1617 * of the server's inode.
1618 *
1619 * This is a bit tricky because we have to make sure all dirty pages
1620 * have been sent off to the server before calling invalidate_inode_pages.
1621 * To make sure no other process adds more write requests while we try
1622 * our best to flush them, we make them sleep during the attribute refresh.
1623 *
1624 * A very similar scenario holds for the dir cache.
1625 */
1626 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1627 {
1628 struct nfs_server *server;
1629 struct nfs_inode *nfsi = NFS_I(inode);
1630 loff_t cur_isize, new_isize;
1631 unsigned long invalid = 0;
1632 unsigned long now = jiffies;
1633 unsigned long save_cache_validity;
1634
1635 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1636 __func__, inode->i_sb->s_id, inode->i_ino,
1637 nfs_display_fhandle_hash(NFS_FH(inode)),
1638 atomic_read(&inode->i_count), fattr->valid);
1639
1640 if (!nfs_fileid_valid(nfsi, fattr)) {
1641 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1642 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1643 NFS_SERVER(inode)->nfs_client->cl_hostname,
1644 inode->i_sb->s_id, (long long)nfsi->fileid,
1645 (long long)fattr->fileid);
1646 goto out_err;
1647 }
1648
1649 /*
1650 * Make sure the inode's type hasn't changed.
1651 */
1652 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1653 /*
1654 * Big trouble! The inode has become a different object.
1655 */
1656 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1657 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1658 goto out_err;
1659 }
1660
1661 server = NFS_SERVER(inode);
1662 /* Update the fsid? */
1663 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1664 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1665 !IS_AUTOMOUNT(inode))
1666 server->fsid = fattr->fsid;
1667
1668 /*
1669 * Update the read time so we don't revalidate too often.
1670 */
1671 nfsi->read_cache_jiffies = fattr->time_start;
1672
1673 save_cache_validity = nfsi->cache_validity;
1674 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1675 | NFS_INO_INVALID_ATIME
1676 | NFS_INO_REVAL_FORCED
1677 | NFS_INO_REVAL_PAGECACHE);
1678
1679 /* Do atomic weak cache consistency updates */
1680 invalid |= nfs_wcc_update_inode(inode, fattr);
1681
1682 /* More cache consistency checks */
1683 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1684 if (inode->i_version != fattr->change_attr) {
1685 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1686 inode->i_sb->s_id, inode->i_ino);
1687 invalid |= NFS_INO_INVALID_ATTR
1688 | NFS_INO_INVALID_DATA
1689 | NFS_INO_INVALID_ACCESS
1690 | NFS_INO_INVALID_ACL;
1691 if (S_ISDIR(inode->i_mode))
1692 nfs_force_lookup_revalidate(inode);
1693 inode->i_version = fattr->change_attr;
1694 }
1695 } else
1696 nfsi->cache_validity |= save_cache_validity;
1697
1698 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1699 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1700 } else if (server->caps & NFS_CAP_MTIME)
1701 nfsi->cache_validity |= save_cache_validity &
1702 (NFS_INO_INVALID_ATTR
1703 | NFS_INO_REVAL_FORCED);
1704
1705 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1706 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1707 } else if (server->caps & NFS_CAP_CTIME)
1708 nfsi->cache_validity |= save_cache_validity &
1709 (NFS_INO_INVALID_ATTR
1710 | NFS_INO_REVAL_FORCED);
1711
1712 /* Check if our cached file size is stale */
1713 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1714 new_isize = nfs_size_to_loff_t(fattr->size);
1715 cur_isize = i_size_read(inode);
1716 if (new_isize != cur_isize) {
1717 /* Do we perhaps have any outstanding writes, or has
1718 * the file grown beyond our last write? */
1719 if ((nfsi->nrequests == 0) || new_isize > cur_isize) {
1720 i_size_write(inode, new_isize);
1721 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1722 }
1723 dprintk("NFS: isize change on server for file %s/%ld "
1724 "(%Ld to %Ld)\n",
1725 inode->i_sb->s_id,
1726 inode->i_ino,
1727 (long long)cur_isize,
1728 (long long)new_isize);
1729 }
1730 } else
1731 nfsi->cache_validity |= save_cache_validity &
1732 (NFS_INO_INVALID_ATTR
1733 | NFS_INO_REVAL_PAGECACHE
1734 | NFS_INO_REVAL_FORCED);
1735
1736
1737 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1738 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1739 else if (server->caps & NFS_CAP_ATIME)
1740 nfsi->cache_validity |= save_cache_validity &
1741 (NFS_INO_INVALID_ATIME
1742 | NFS_INO_REVAL_FORCED);
1743
1744 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1745 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1746 umode_t newmode = inode->i_mode & S_IFMT;
1747 newmode |= fattr->mode & S_IALLUGO;
1748 inode->i_mode = newmode;
1749 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1750 }
1751 } else if (server->caps & NFS_CAP_MODE)
1752 nfsi->cache_validity |= save_cache_validity &
1753 (NFS_INO_INVALID_ATTR
1754 | NFS_INO_INVALID_ACCESS
1755 | NFS_INO_INVALID_ACL
1756 | NFS_INO_REVAL_FORCED);
1757
1758 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1759 if (!uid_eq(inode->i_uid, fattr->uid)) {
1760 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1761 inode->i_uid = fattr->uid;
1762 }
1763 } else if (server->caps & NFS_CAP_OWNER)
1764 nfsi->cache_validity |= save_cache_validity &
1765 (NFS_INO_INVALID_ATTR
1766 | NFS_INO_INVALID_ACCESS
1767 | NFS_INO_INVALID_ACL
1768 | NFS_INO_REVAL_FORCED);
1769
1770 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1771 if (!gid_eq(inode->i_gid, fattr->gid)) {
1772 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1773 inode->i_gid = fattr->gid;
1774 }
1775 } else if (server->caps & NFS_CAP_OWNER_GROUP)
1776 nfsi->cache_validity |= save_cache_validity &
1777 (NFS_INO_INVALID_ATTR
1778 | NFS_INO_INVALID_ACCESS
1779 | NFS_INO_INVALID_ACL
1780 | NFS_INO_REVAL_FORCED);
1781
1782 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1783 if (inode->i_nlink != fattr->nlink) {
1784 invalid |= NFS_INO_INVALID_ATTR;
1785 if (S_ISDIR(inode->i_mode))
1786 invalid |= NFS_INO_INVALID_DATA;
1787 set_nlink(inode, fattr->nlink);
1788 }
1789 } else if (server->caps & NFS_CAP_NLINK)
1790 nfsi->cache_validity |= save_cache_validity &
1791 (NFS_INO_INVALID_ATTR
1792 | NFS_INO_REVAL_FORCED);
1793
1794 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1795 /*
1796 * report the blocks in 512byte units
1797 */
1798 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1799 }
1800 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1801 inode->i_blocks = fattr->du.nfs2.blocks;
1802
1803 /* Update attrtimeo value if we're out of the unstable period */
1804 if (invalid & NFS_INO_INVALID_ATTR) {
1805 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1806 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1807 nfsi->attrtimeo_timestamp = now;
1808 /* Set barrier to be more recent than all outstanding updates */
1809 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1810 } else {
1811 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1812 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1813 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1814 nfsi->attrtimeo_timestamp = now;
1815 }
1816 /* Set the barrier to be more recent than this fattr */
1817 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
1818 nfsi->attr_gencount = fattr->gencount;
1819 }
1820 invalid &= ~NFS_INO_INVALID_ATTR;
1821 /* Don't invalidate the data if we were to blame */
1822 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1823 || S_ISLNK(inode->i_mode)))
1824 invalid &= ~NFS_INO_INVALID_DATA;
1825 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1826 (save_cache_validity & NFS_INO_REVAL_FORCED))
1827 nfs_set_cache_invalid(inode, invalid);
1828
1829 return 0;
1830 out_err:
1831 /*
1832 * No need to worry about unhashing the dentry, as the
1833 * lookup validation will know that the inode is bad.
1834 * (But we fall through to invalidate the caches.)
1835 */
1836 nfs_invalidate_inode(inode);
1837 return -ESTALE;
1838 }
1839
1840 struct inode *nfs_alloc_inode(struct super_block *sb)
1841 {
1842 struct nfs_inode *nfsi;
1843 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1844 if (!nfsi)
1845 return NULL;
1846 nfsi->flags = 0UL;
1847 nfsi->cache_validity = 0UL;
1848 #if IS_ENABLED(CONFIG_NFS_V4)
1849 nfsi->nfs4_acl = NULL;
1850 #endif /* CONFIG_NFS_V4 */
1851 return &nfsi->vfs_inode;
1852 }
1853 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1854
1855 static void nfs_i_callback(struct rcu_head *head)
1856 {
1857 struct inode *inode = container_of(head, struct inode, i_rcu);
1858 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1859 }
1860
1861 void nfs_destroy_inode(struct inode *inode)
1862 {
1863 call_rcu(&inode->i_rcu, nfs_i_callback);
1864 }
1865 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1866
1867 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1868 {
1869 #if IS_ENABLED(CONFIG_NFS_V4)
1870 INIT_LIST_HEAD(&nfsi->open_states);
1871 nfsi->delegation = NULL;
1872 init_rwsem(&nfsi->rwsem);
1873 nfsi->layout = NULL;
1874 #endif
1875 }
1876
1877 static void init_once(void *foo)
1878 {
1879 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1880
1881 inode_init_once(&nfsi->vfs_inode);
1882 INIT_LIST_HEAD(&nfsi->open_files);
1883 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1884 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1885 INIT_LIST_HEAD(&nfsi->commit_info.list);
1886 nfsi->nrequests = 0;
1887 nfsi->commit_info.ncommit = 0;
1888 atomic_set(&nfsi->commit_info.rpcs_out, 0);
1889 atomic_set(&nfsi->silly_count, 1);
1890 INIT_HLIST_HEAD(&nfsi->silly_list);
1891 init_waitqueue_head(&nfsi->waitqueue);
1892 nfs4_init_once(nfsi);
1893 }
1894
1895 static int __init nfs_init_inodecache(void)
1896 {
1897 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1898 sizeof(struct nfs_inode),
1899 0, (SLAB_RECLAIM_ACCOUNT|
1900 SLAB_MEM_SPREAD),
1901 init_once);
1902 if (nfs_inode_cachep == NULL)
1903 return -ENOMEM;
1904
1905 return 0;
1906 }
1907
1908 static void nfs_destroy_inodecache(void)
1909 {
1910 /*
1911 * Make sure all delayed rcu free inodes are flushed before we
1912 * destroy cache.
1913 */
1914 rcu_barrier();
1915 kmem_cache_destroy(nfs_inode_cachep);
1916 }
1917
1918 struct workqueue_struct *nfsiod_workqueue;
1919 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1920
1921 /*
1922 * start up the nfsiod workqueue
1923 */
1924 static int nfsiod_start(void)
1925 {
1926 struct workqueue_struct *wq;
1927 dprintk("RPC: creating workqueue nfsiod\n");
1928 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1929 if (wq == NULL)
1930 return -ENOMEM;
1931 nfsiod_workqueue = wq;
1932 return 0;
1933 }
1934
1935 /*
1936 * Destroy the nfsiod workqueue
1937 */
1938 static void nfsiod_stop(void)
1939 {
1940 struct workqueue_struct *wq;
1941
1942 wq = nfsiod_workqueue;
1943 if (wq == NULL)
1944 return;
1945 nfsiod_workqueue = NULL;
1946 destroy_workqueue(wq);
1947 }
1948
1949 int nfs_net_id;
1950 EXPORT_SYMBOL_GPL(nfs_net_id);
1951
1952 static int nfs_net_init(struct net *net)
1953 {
1954 nfs_clients_init(net);
1955 return nfs_fs_proc_net_init(net);
1956 }
1957
1958 static void nfs_net_exit(struct net *net)
1959 {
1960 nfs_fs_proc_net_exit(net);
1961 nfs_cleanup_cb_ident_idr(net);
1962 }
1963
1964 static struct pernet_operations nfs_net_ops = {
1965 .init = nfs_net_init,
1966 .exit = nfs_net_exit,
1967 .id = &nfs_net_id,
1968 .size = sizeof(struct nfs_net),
1969 };
1970
1971 /*
1972 * Initialize NFS
1973 */
1974 static int __init init_nfs_fs(void)
1975 {
1976 int err;
1977
1978 err = register_pernet_subsys(&nfs_net_ops);
1979 if (err < 0)
1980 goto out9;
1981
1982 err = nfs_fscache_register();
1983 if (err < 0)
1984 goto out8;
1985
1986 err = nfsiod_start();
1987 if (err)
1988 goto out7;
1989
1990 err = nfs_fs_proc_init();
1991 if (err)
1992 goto out6;
1993
1994 err = nfs_init_nfspagecache();
1995 if (err)
1996 goto out5;
1997
1998 err = nfs_init_inodecache();
1999 if (err)
2000 goto out4;
2001
2002 err = nfs_init_readpagecache();
2003 if (err)
2004 goto out3;
2005
2006 err = nfs_init_writepagecache();
2007 if (err)
2008 goto out2;
2009
2010 err = nfs_init_directcache();
2011 if (err)
2012 goto out1;
2013
2014 rpc_proc_register(&init_net, &nfs_rpcstat);
2015
2016 err = register_nfs_fs();
2017 if (err)
2018 goto out0;
2019
2020 return 0;
2021 out0:
2022 rpc_proc_unregister(&init_net, "nfs");
2023 nfs_destroy_directcache();
2024 out1:
2025 nfs_destroy_writepagecache();
2026 out2:
2027 nfs_destroy_readpagecache();
2028 out3:
2029 nfs_destroy_inodecache();
2030 out4:
2031 nfs_destroy_nfspagecache();
2032 out5:
2033 nfs_fs_proc_exit();
2034 out6:
2035 nfsiod_stop();
2036 out7:
2037 nfs_fscache_unregister();
2038 out8:
2039 unregister_pernet_subsys(&nfs_net_ops);
2040 out9:
2041 return err;
2042 }
2043
2044 static void __exit exit_nfs_fs(void)
2045 {
2046 nfs_destroy_directcache();
2047 nfs_destroy_writepagecache();
2048 nfs_destroy_readpagecache();
2049 nfs_destroy_inodecache();
2050 nfs_destroy_nfspagecache();
2051 nfs_fscache_unregister();
2052 unregister_pernet_subsys(&nfs_net_ops);
2053 rpc_proc_unregister(&init_net, "nfs");
2054 unregister_nfs_fs();
2055 nfs_fs_proc_exit();
2056 nfsiod_stop();
2057 }
2058
2059 /* Not quite true; I just maintain it */
2060 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2061 MODULE_LICENSE("GPL");
2062 module_param(enable_ino64, bool, 0644);
2063
2064 module_init(init_nfs_fs)
2065 module_exit(exit_nfs_fs)
Linux with added FPC-III support