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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/inode.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * nfs inode and superblock handling functions | |
7 | * | |
8 | * Modularised by Alan Cox <Alan.Cox@linux.org>, 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 | ||
1da177e4 LT |
16 | #include <linux/module.h> |
17 | #include <linux/init.h> | |
18 | ||
19 | #include <linux/time.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/stat.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/unistd.h> | |
26 | #include <linux/sunrpc/clnt.h> | |
27 | #include <linux/sunrpc/stats.h> | |
4ece3a2d | 28 | #include <linux/sunrpc/metrics.h> |
1da177e4 LT |
29 | #include <linux/nfs_fs.h> |
30 | #include <linux/nfs_mount.h> | |
31 | #include <linux/nfs4_mount.h> | |
32 | #include <linux/lockd/bind.h> | |
33 | #include <linux/smp_lock.h> | |
34 | #include <linux/seq_file.h> | |
35 | #include <linux/mount.h> | |
36 | #include <linux/nfs_idmap.h> | |
37 | #include <linux/vfs.h> | |
9cdb3883 MN |
38 | #include <linux/inet.h> |
39 | #include <linux/nfs_xdr.h> | |
1da177e4 LT |
40 | |
41 | #include <asm/system.h> | |
42 | #include <asm/uaccess.h> | |
43 | ||
4ce79717 | 44 | #include "nfs4_fs.h" |
a72b4422 | 45 | #include "callback.h" |
1da177e4 | 46 | #include "delegation.h" |
d9ef5a8c | 47 | #include "iostat.h" |
f7b422b1 | 48 | #include "internal.h" |
1da177e4 LT |
49 | |
50 | #define NFSDBG_FACILITY NFSDBG_VFS | |
51 | #define NFS_PARANOIA 1 | |
52 | ||
1da177e4 | 53 | static void nfs_invalidate_inode(struct inode *); |
24aa1fe6 | 54 | static int nfs_update_inode(struct inode *, struct nfs_fattr *); |
1da177e4 | 55 | |
ada70d94 | 56 | static void nfs_zap_acl_cache(struct inode *); |
1da177e4 | 57 | |
e18b890b | 58 | static struct kmem_cache * nfs_inode_cachep; |
b7fa0554 | 59 | |
1da177e4 LT |
60 | static inline unsigned long |
61 | nfs_fattr_to_ino_t(struct nfs_fattr *fattr) | |
62 | { | |
63 | return nfs_fileid_to_ino_t(fattr->fileid); | |
64 | } | |
65 | ||
f7b422b1 | 66 | int nfs_write_inode(struct inode *inode, int sync) |
1da177e4 | 67 | { |
1da177e4 LT |
68 | int ret; |
69 | ||
d30c8348 TM |
70 | if (sync) { |
71 | ret = filemap_fdatawait(inode->i_mapping); | |
72 | if (ret == 0) | |
73 | ret = nfs_commit_inode(inode, FLUSH_SYNC); | |
74 | } else | |
75 | ret = nfs_commit_inode(inode, 0); | |
76 | if (ret >= 0) | |
77 | return 0; | |
78 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
79 | return ret; | |
1da177e4 LT |
80 | } |
81 | ||
f7b422b1 | 82 | void nfs_clear_inode(struct inode *inode) |
1da177e4 | 83 | { |
da6d503a TM |
84 | /* |
85 | * The following should never happen... | |
86 | */ | |
87 | BUG_ON(nfs_have_writebacks(inode)); | |
1c3c07e9 TM |
88 | BUG_ON(!list_empty(&NFS_I(inode)->open_files)); |
89 | BUG_ON(atomic_read(&NFS_I(inode)->data_updates) != 0); | |
ada70d94 | 90 | nfs_zap_acl_cache(inode); |
1c3c07e9 | 91 | nfs_access_zap_cache(inode); |
1da177e4 LT |
92 | } |
93 | ||
29884df0 TM |
94 | /** |
95 | * nfs_sync_mapping - helper to flush all mmapped dirty data to disk | |
96 | */ | |
97 | int nfs_sync_mapping(struct address_space *mapping) | |
98 | { | |
99 | int ret; | |
100 | ||
101 | if (mapping->nrpages == 0) | |
102 | return 0; | |
103 | unmap_mapping_range(mapping, 0, 0, 0); | |
28fd1298 | 104 | ret = filemap_write_and_wait(mapping); |
29884df0 TM |
105 | if (ret != 0) |
106 | goto out; | |
107 | ret = nfs_wb_all(mapping->host); | |
108 | out: | |
109 | return ret; | |
110 | } | |
111 | ||
1da177e4 LT |
112 | /* |
113 | * Invalidate the local caches | |
114 | */ | |
b37b03b7 | 115 | static void nfs_zap_caches_locked(struct inode *inode) |
1da177e4 LT |
116 | { |
117 | struct nfs_inode *nfsi = NFS_I(inode); | |
118 | int mode = inode->i_mode; | |
119 | ||
91d5b470 CL |
120 | nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); |
121 | ||
1da177e4 LT |
122 | NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode); |
123 | NFS_ATTRTIMEO_UPDATE(inode) = jiffies; | |
124 | ||
125 | memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode))); | |
126 | if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) | |
55296809 | 127 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; |
1da177e4 | 128 | else |
55296809 | 129 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; |
b37b03b7 | 130 | } |
dc59250c | 131 | |
b37b03b7 TM |
132 | void nfs_zap_caches(struct inode *inode) |
133 | { | |
134 | spin_lock(&inode->i_lock); | |
135 | nfs_zap_caches_locked(inode); | |
dc59250c | 136 | spin_unlock(&inode->i_lock); |
ada70d94 TM |
137 | } |
138 | ||
cd9ae2b6 TM |
139 | void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) |
140 | { | |
141 | if (mapping->nrpages != 0) { | |
142 | spin_lock(&inode->i_lock); | |
143 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
144 | spin_unlock(&inode->i_lock); | |
145 | } | |
146 | } | |
147 | ||
ada70d94 TM |
148 | static void nfs_zap_acl_cache(struct inode *inode) |
149 | { | |
150 | void (*clear_acl_cache)(struct inode *); | |
151 | ||
152 | clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; | |
153 | if (clear_acl_cache != NULL) | |
154 | clear_acl_cache(inode); | |
dc59250c | 155 | spin_lock(&inode->i_lock); |
55296809 | 156 | NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; |
dc59250c | 157 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
158 | } |
159 | ||
160 | /* | |
b37b03b7 TM |
161 | * Invalidate, but do not unhash, the inode. |
162 | * NB: must be called with inode->i_lock held! | |
1da177e4 | 163 | */ |
b37b03b7 | 164 | static void nfs_invalidate_inode(struct inode *inode) |
1da177e4 | 165 | { |
b37b03b7 TM |
166 | set_bit(NFS_INO_STALE, &NFS_FLAGS(inode)); |
167 | nfs_zap_caches_locked(inode); | |
1da177e4 LT |
168 | } |
169 | ||
170 | struct nfs_find_desc { | |
171 | struct nfs_fh *fh; | |
172 | struct nfs_fattr *fattr; | |
173 | }; | |
174 | ||
175 | /* | |
176 | * In NFSv3 we can have 64bit inode numbers. In order to support | |
177 | * this, and re-exported directories (also seen in NFSv2) | |
178 | * we are forced to allow 2 different inodes to have the same | |
179 | * i_ino. | |
180 | */ | |
181 | static int | |
182 | nfs_find_actor(struct inode *inode, void *opaque) | |
183 | { | |
184 | struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; | |
185 | struct nfs_fh *fh = desc->fh; | |
186 | struct nfs_fattr *fattr = desc->fattr; | |
187 | ||
188 | if (NFS_FILEID(inode) != fattr->fileid) | |
189 | return 0; | |
190 | if (nfs_compare_fh(NFS_FH(inode), fh)) | |
191 | return 0; | |
192 | if (is_bad_inode(inode) || NFS_STALE(inode)) | |
193 | return 0; | |
194 | return 1; | |
195 | } | |
196 | ||
197 | static int | |
198 | nfs_init_locked(struct inode *inode, void *opaque) | |
199 | { | |
200 | struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; | |
201 | struct nfs_fattr *fattr = desc->fattr; | |
202 | ||
203 | NFS_FILEID(inode) = fattr->fileid; | |
204 | nfs_copy_fh(NFS_FH(inode), desc->fh); | |
205 | return 0; | |
206 | } | |
207 | ||
208 | /* Don't use READDIRPLUS on directories that we believe are too large */ | |
209 | #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE) | |
210 | ||
211 | /* | |
212 | * This is our front-end to iget that looks up inodes by file handle | |
213 | * instead of inode number. | |
214 | */ | |
215 | struct inode * | |
216 | nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) | |
217 | { | |
218 | struct nfs_find_desc desc = { | |
219 | .fh = fh, | |
220 | .fattr = fattr | |
221 | }; | |
03f28e3a | 222 | struct inode *inode = ERR_PTR(-ENOENT); |
1da177e4 LT |
223 | unsigned long hash; |
224 | ||
225 | if ((fattr->valid & NFS_ATTR_FATTR) == 0) | |
226 | goto out_no_inode; | |
227 | ||
228 | if (!fattr->nlink) { | |
229 | printk("NFS: Buggy server - nlink == 0!\n"); | |
230 | goto out_no_inode; | |
231 | } | |
232 | ||
233 | hash = nfs_fattr_to_ino_t(fattr); | |
234 | ||
03f28e3a TM |
235 | inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); |
236 | if (inode == NULL) { | |
237 | inode = ERR_PTR(-ENOMEM); | |
1da177e4 | 238 | goto out_no_inode; |
03f28e3a | 239 | } |
1da177e4 LT |
240 | |
241 | if (inode->i_state & I_NEW) { | |
242 | struct nfs_inode *nfsi = NFS_I(inode); | |
b0c4fddc | 243 | unsigned long now = jiffies; |
1da177e4 LT |
244 | |
245 | /* We set i_ino for the few things that still rely on it, | |
246 | * such as stat(2) */ | |
247 | inode->i_ino = hash; | |
248 | ||
249 | /* We can't support update_atime(), since the server will reset it */ | |
250 | inode->i_flags |= S_NOATIME|S_NOCMTIME; | |
251 | inode->i_mode = fattr->mode; | |
252 | /* Why so? Because we want revalidate for devices/FIFOs, and | |
253 | * that's precisely what we have in nfs_file_inode_operations. | |
254 | */ | |
8fa5c000 | 255 | inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops; |
1da177e4 LT |
256 | if (S_ISREG(inode->i_mode)) { |
257 | inode->i_fop = &nfs_file_operations; | |
258 | inode->i_data.a_ops = &nfs_file_aops; | |
259 | inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info; | |
260 | } else if (S_ISDIR(inode->i_mode)) { | |
8fa5c000 | 261 | inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; |
1da177e4 LT |
262 | inode->i_fop = &nfs_dir_operations; |
263 | if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS) | |
264 | && fattr->size <= NFS_LIMIT_READDIRPLUS) | |
412d582e | 265 | set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); |
55a97593 TM |
266 | /* Deal with crossing mountpoints */ |
267 | if (!nfs_fsid_equal(&NFS_SB(sb)->fsid, &fattr->fsid)) { | |
6b97fd3d MN |
268 | if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) |
269 | inode->i_op = &nfs_referral_inode_operations; | |
270 | else | |
271 | inode->i_op = &nfs_mountpoint_inode_operations; | |
55a97593 TM |
272 | inode->i_fop = NULL; |
273 | } | |
1da177e4 LT |
274 | } else if (S_ISLNK(inode->i_mode)) |
275 | inode->i_op = &nfs_symlink_inode_operations; | |
276 | else | |
277 | init_special_inode(inode, inode->i_mode, fattr->rdev); | |
278 | ||
33801147 | 279 | nfsi->read_cache_jiffies = fattr->time_start; |
b0c4fddc TM |
280 | nfsi->last_updated = now; |
281 | nfsi->cache_change_attribute = now; | |
1da177e4 LT |
282 | inode->i_atime = fattr->atime; |
283 | inode->i_mtime = fattr->mtime; | |
284 | inode->i_ctime = fattr->ctime; | |
285 | if (fattr->valid & NFS_ATTR_FATTR_V4) | |
286 | nfsi->change_attr = fattr->change_attr; | |
287 | inode->i_size = nfs_size_to_loff_t(fattr->size); | |
288 | inode->i_nlink = fattr->nlink; | |
289 | inode->i_uid = fattr->uid; | |
290 | inode->i_gid = fattr->gid; | |
291 | if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) { | |
292 | /* | |
293 | * report the blocks in 512byte units | |
294 | */ | |
295 | inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); | |
1da177e4 LT |
296 | } else { |
297 | inode->i_blocks = fattr->du.nfs2.blocks; | |
1da177e4 LT |
298 | } |
299 | nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); | |
b0c4fddc | 300 | nfsi->attrtimeo_timestamp = now; |
1da177e4 | 301 | memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); |
1c3c07e9 | 302 | nfsi->access_cache = RB_ROOT; |
1da177e4 LT |
303 | |
304 | unlock_new_inode(inode); | |
305 | } else | |
306 | nfs_refresh_inode(inode, fattr); | |
307 | dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n", | |
308 | inode->i_sb->s_id, | |
309 | (long long)NFS_FILEID(inode), | |
310 | atomic_read(&inode->i_count)); | |
311 | ||
312 | out: | |
313 | return inode; | |
314 | ||
315 | out_no_inode: | |
03f28e3a | 316 | dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); |
1da177e4 LT |
317 | goto out; |
318 | } | |
319 | ||
320 | #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET) | |
321 | ||
322 | int | |
323 | nfs_setattr(struct dentry *dentry, struct iattr *attr) | |
324 | { | |
325 | struct inode *inode = dentry->d_inode; | |
326 | struct nfs_fattr fattr; | |
327 | int error; | |
328 | ||
91d5b470 CL |
329 | nfs_inc_stats(inode, NFSIOS_VFSSETATTR); |
330 | ||
1da177e4 LT |
331 | if (attr->ia_valid & ATTR_SIZE) { |
332 | if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode)) | |
333 | attr->ia_valid &= ~ATTR_SIZE; | |
334 | } | |
335 | ||
336 | /* Optimization: if the end result is no change, don't RPC */ | |
337 | attr->ia_valid &= NFS_VALID_ATTRS; | |
338 | if (attr->ia_valid == 0) | |
339 | return 0; | |
340 | ||
341 | lock_kernel(); | |
342 | nfs_begin_data_update(inode); | |
755c1e20 TM |
343 | /* Write all dirty data */ |
344 | filemap_write_and_wait(inode->i_mapping); | |
345 | nfs_wb_all(inode); | |
642ac549 TM |
346 | /* |
347 | * Return any delegations if we're going to change ACLs | |
348 | */ | |
349 | if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) | |
350 | nfs_inode_return_delegation(inode); | |
1da177e4 | 351 | error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr); |
65e4308d | 352 | if (error == 0) |
1da177e4 | 353 | nfs_refresh_inode(inode, &fattr); |
65e4308d TM |
354 | nfs_end_data_update(inode); |
355 | unlock_kernel(); | |
356 | return error; | |
357 | } | |
358 | ||
359 | /** | |
360 | * nfs_setattr_update_inode - Update inode metadata after a setattr call. | |
361 | * @inode: pointer to struct inode | |
362 | * @attr: pointer to struct iattr | |
363 | * | |
364 | * Note: we do this in the *proc.c in order to ensure that | |
365 | * it works for things like exclusive creates too. | |
366 | */ | |
367 | void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr) | |
368 | { | |
369 | if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { | |
1da177e4 | 370 | if ((attr->ia_valid & ATTR_MODE) != 0) { |
65e4308d TM |
371 | int mode = attr->ia_mode & S_IALLUGO; |
372 | mode |= inode->i_mode & ~S_IALLUGO; | |
1da177e4 LT |
373 | inode->i_mode = mode; |
374 | } | |
375 | if ((attr->ia_valid & ATTR_UID) != 0) | |
376 | inode->i_uid = attr->ia_uid; | |
377 | if ((attr->ia_valid & ATTR_GID) != 0) | |
378 | inode->i_gid = attr->ia_gid; | |
dc59250c | 379 | spin_lock(&inode->i_lock); |
55296809 | 380 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
dc59250c | 381 | spin_unlock(&inode->i_lock); |
65e4308d TM |
382 | } |
383 | if ((attr->ia_valid & ATTR_SIZE) != 0) { | |
91d5b470 | 384 | nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); |
65e4308d TM |
385 | inode->i_size = attr->ia_size; |
386 | vmtruncate(inode, attr->ia_size); | |
387 | } | |
1da177e4 LT |
388 | } |
389 | ||
412d582e CL |
390 | static int nfs_wait_schedule(void *word) |
391 | { | |
392 | if (signal_pending(current)) | |
393 | return -ERESTARTSYS; | |
394 | schedule(); | |
395 | return 0; | |
396 | } | |
397 | ||
1da177e4 LT |
398 | /* |
399 | * Wait for the inode to get unlocked. | |
1da177e4 | 400 | */ |
412d582e | 401 | static int nfs_wait_on_inode(struct inode *inode) |
1da177e4 LT |
402 | { |
403 | struct rpc_clnt *clnt = NFS_CLIENT(inode); | |
404 | struct nfs_inode *nfsi = NFS_I(inode); | |
412d582e | 405 | sigset_t oldmask; |
1da177e4 | 406 | int error; |
412d582e | 407 | |
412d582e CL |
408 | rpc_clnt_sigmask(clnt, &oldmask); |
409 | error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING, | |
410 | nfs_wait_schedule, TASK_INTERRUPTIBLE); | |
411 | rpc_clnt_sigunmask(clnt, &oldmask); | |
412d582e | 412 | |
1da177e4 LT |
413 | return error; |
414 | } | |
415 | ||
412d582e CL |
416 | static void nfs_wake_up_inode(struct inode *inode) |
417 | { | |
418 | struct nfs_inode *nfsi = NFS_I(inode); | |
419 | ||
420 | clear_bit(NFS_INO_REVALIDATING, &nfsi->flags); | |
421 | smp_mb__after_clear_bit(); | |
422 | wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING); | |
423 | } | |
424 | ||
1da177e4 LT |
425 | int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
426 | { | |
427 | struct inode *inode = dentry->d_inode; | |
55296809 | 428 | int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; |
1da177e4 LT |
429 | int err; |
430 | ||
70b9ecbd | 431 | /* Flush out writes to the server in order to update c/mtime */ |
63470738 TM |
432 | if (S_ISREG(inode->i_mode)) |
433 | nfs_sync_mapping_range(inode->i_mapping, 0, 0, FLUSH_NOCOMMIT); | |
fc33a7bb CH |
434 | |
435 | /* | |
436 | * We may force a getattr if the user cares about atime. | |
437 | * | |
438 | * Note that we only have to check the vfsmount flags here: | |
439 | * - NFS always sets S_NOATIME by so checking it would give a | |
440 | * bogus result | |
441 | * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is | |
442 | * no point in checking those. | |
443 | */ | |
444 | if ((mnt->mnt_flags & MNT_NOATIME) || | |
445 | ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) | |
1da177e4 | 446 | need_atime = 0; |
fc33a7bb | 447 | |
1da177e4 LT |
448 | if (need_atime) |
449 | err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
450 | else | |
451 | err = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
452 | if (!err) | |
453 | generic_fillattr(inode, stat); | |
454 | return err; | |
455 | } | |
456 | ||
b92dccf6 | 457 | static struct nfs_open_context *alloc_nfs_open_context(struct vfsmount *mnt, struct dentry *dentry, struct rpc_cred *cred) |
1da177e4 LT |
458 | { |
459 | struct nfs_open_context *ctx; | |
460 | ||
f52720ca | 461 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); |
1da177e4 LT |
462 | if (ctx != NULL) { |
463 | atomic_set(&ctx->count, 1); | |
464 | ctx->dentry = dget(dentry); | |
b92dccf6 | 465 | ctx->vfsmnt = mntget(mnt); |
1da177e4 LT |
466 | ctx->cred = get_rpccred(cred); |
467 | ctx->state = NULL; | |
468 | ctx->lockowner = current->files; | |
469 | ctx->error = 0; | |
00a92642 | 470 | ctx->dir_cookie = 0; |
1da177e4 LT |
471 | } |
472 | return ctx; | |
473 | } | |
474 | ||
475 | struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) | |
476 | { | |
477 | if (ctx != NULL) | |
478 | atomic_inc(&ctx->count); | |
479 | return ctx; | |
480 | } | |
481 | ||
482 | void put_nfs_open_context(struct nfs_open_context *ctx) | |
483 | { | |
484 | if (atomic_dec_and_test(&ctx->count)) { | |
485 | if (!list_empty(&ctx->list)) { | |
486 | struct inode *inode = ctx->dentry->d_inode; | |
487 | spin_lock(&inode->i_lock); | |
488 | list_del(&ctx->list); | |
489 | spin_unlock(&inode->i_lock); | |
490 | } | |
491 | if (ctx->state != NULL) | |
492 | nfs4_close_state(ctx->state, ctx->mode); | |
493 | if (ctx->cred != NULL) | |
494 | put_rpccred(ctx->cred); | |
495 | dput(ctx->dentry); | |
b92dccf6 | 496 | mntput(ctx->vfsmnt); |
1da177e4 LT |
497 | kfree(ctx); |
498 | } | |
499 | } | |
500 | ||
501 | /* | |
502 | * Ensure that mmap has a recent RPC credential for use when writing out | |
503 | * shared pages | |
504 | */ | |
b92dccf6 | 505 | static void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) |
1da177e4 | 506 | { |
01cce933 | 507 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
508 | struct nfs_inode *nfsi = NFS_I(inode); |
509 | ||
510 | filp->private_data = get_nfs_open_context(ctx); | |
511 | spin_lock(&inode->i_lock); | |
512 | list_add(&ctx->list, &nfsi->open_files); | |
513 | spin_unlock(&inode->i_lock); | |
514 | } | |
515 | ||
d530838b TM |
516 | /* |
517 | * Given an inode, search for an open context with the desired characteristics | |
518 | */ | |
519 | struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode) | |
1da177e4 LT |
520 | { |
521 | struct nfs_inode *nfsi = NFS_I(inode); | |
522 | struct nfs_open_context *pos, *ctx = NULL; | |
523 | ||
524 | spin_lock(&inode->i_lock); | |
525 | list_for_each_entry(pos, &nfsi->open_files, list) { | |
d530838b TM |
526 | if (cred != NULL && pos->cred != cred) |
527 | continue; | |
1da177e4 LT |
528 | if ((pos->mode & mode) == mode) { |
529 | ctx = get_nfs_open_context(pos); | |
530 | break; | |
531 | } | |
532 | } | |
533 | spin_unlock(&inode->i_lock); | |
534 | return ctx; | |
535 | } | |
536 | ||
b92dccf6 | 537 | static void nfs_file_clear_open_context(struct file *filp) |
1da177e4 | 538 | { |
01cce933 | 539 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
540 | struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data; |
541 | ||
542 | if (ctx) { | |
543 | filp->private_data = NULL; | |
544 | spin_lock(&inode->i_lock); | |
545 | list_move_tail(&ctx->list, &NFS_I(inode)->open_files); | |
546 | spin_unlock(&inode->i_lock); | |
547 | put_nfs_open_context(ctx); | |
548 | } | |
549 | } | |
550 | ||
551 | /* | |
552 | * These allocate and release file read/write context information. | |
553 | */ | |
554 | int nfs_open(struct inode *inode, struct file *filp) | |
555 | { | |
556 | struct nfs_open_context *ctx; | |
557 | struct rpc_cred *cred; | |
558 | ||
559 | cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0); | |
560 | if (IS_ERR(cred)) | |
561 | return PTR_ERR(cred); | |
01cce933 | 562 | ctx = alloc_nfs_open_context(filp->f_path.mnt, filp->f_path.dentry, cred); |
1da177e4 LT |
563 | put_rpccred(cred); |
564 | if (ctx == NULL) | |
565 | return -ENOMEM; | |
566 | ctx->mode = filp->f_mode; | |
567 | nfs_file_set_open_context(filp, ctx); | |
568 | put_nfs_open_context(ctx); | |
1da177e4 LT |
569 | return 0; |
570 | } | |
571 | ||
572 | int nfs_release(struct inode *inode, struct file *filp) | |
573 | { | |
1da177e4 LT |
574 | nfs_file_clear_open_context(filp); |
575 | return 0; | |
576 | } | |
577 | ||
578 | /* | |
579 | * This function is called whenever some part of NFS notices that | |
580 | * the cached attributes have to be refreshed. | |
581 | */ | |
582 | int | |
583 | __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) | |
584 | { | |
585 | int status = -ESTALE; | |
586 | struct nfs_fattr fattr; | |
587 | struct nfs_inode *nfsi = NFS_I(inode); | |
1da177e4 LT |
588 | |
589 | dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n", | |
590 | inode->i_sb->s_id, (long long)NFS_FILEID(inode)); | |
591 | ||
1842bfb4 | 592 | nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); |
1da177e4 | 593 | lock_kernel(); |
85233a7a | 594 | if (is_bad_inode(inode)) |
1da177e4 LT |
595 | goto out_nowait; |
596 | if (NFS_STALE(inode)) | |
597 | goto out_nowait; | |
598 | ||
412d582e CL |
599 | status = nfs_wait_on_inode(inode); |
600 | if (status < 0) | |
601 | goto out; | |
602 | if (NFS_STALE(inode)) { | |
603 | status = -ESTALE; | |
604 | /* Do we trust the cached ESTALE? */ | |
605 | if (NFS_ATTRTIMEO(inode) != 0) { | |
44b11874 | 606 | if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME)) { |
412d582e CL |
607 | /* no */ |
608 | } else | |
609 | goto out; | |
610 | } | |
1da177e4 | 611 | } |
1da177e4 | 612 | |
1da177e4 LT |
613 | status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr); |
614 | if (status != 0) { | |
615 | dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n", | |
616 | inode->i_sb->s_id, | |
617 | (long long)NFS_FILEID(inode), status); | |
618 | if (status == -ESTALE) { | |
619 | nfs_zap_caches(inode); | |
620 | if (!S_ISDIR(inode->i_mode)) | |
412d582e | 621 | set_bit(NFS_INO_STALE, &NFS_FLAGS(inode)); |
1da177e4 LT |
622 | } |
623 | goto out; | |
624 | } | |
625 | ||
33801147 | 626 | spin_lock(&inode->i_lock); |
24aa1fe6 | 627 | status = nfs_update_inode(inode, &fattr); |
1da177e4 | 628 | if (status) { |
33801147 | 629 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
630 | dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n", |
631 | inode->i_sb->s_id, | |
632 | (long long)NFS_FILEID(inode), status); | |
633 | goto out; | |
634 | } | |
dc59250c | 635 | spin_unlock(&inode->i_lock); |
55296809 | 636 | |
24aa1fe6 | 637 | if (nfsi->cache_validity & NFS_INO_INVALID_ACL) |
ada70d94 | 638 | nfs_zap_acl_cache(inode); |
55296809 | 639 | |
1da177e4 LT |
640 | dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n", |
641 | inode->i_sb->s_id, | |
642 | (long long)NFS_FILEID(inode)); | |
643 | ||
412d582e CL |
644 | out: |
645 | nfs_wake_up_inode(inode); | |
646 | ||
1da177e4 LT |
647 | out_nowait: |
648 | unlock_kernel(); | |
649 | return status; | |
650 | } | |
651 | ||
652 | int nfs_attribute_timeout(struct inode *inode) | |
653 | { | |
654 | struct nfs_inode *nfsi = NFS_I(inode); | |
655 | ||
656 | if (nfs_have_delegation(inode, FMODE_READ)) | |
657 | return 0; | |
658 | return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo); | |
659 | } | |
660 | ||
661 | /** | |
662 | * nfs_revalidate_inode - Revalidate the inode attributes | |
663 | * @server - pointer to nfs_server struct | |
664 | * @inode - pointer to inode struct | |
665 | * | |
666 | * Updates inode attribute information by retrieving the data from the server. | |
667 | */ | |
668 | int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) | |
669 | { | |
44b11874 | 670 | if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR) |
1da177e4 LT |
671 | && !nfs_attribute_timeout(inode)) |
672 | return NFS_STALE(inode) ? -ESTALE : 0; | |
673 | return __nfs_revalidate_inode(server, inode); | |
674 | } | |
675 | ||
717d44e8 TM |
676 | static int nfs_invalidate_mapping_nolock(struct inode *inode, struct address_space *mapping) |
677 | { | |
678 | struct nfs_inode *nfsi = NFS_I(inode); | |
679 | ||
680 | if (mapping->nrpages != 0) { | |
681 | int ret = invalidate_inode_pages2(mapping); | |
682 | if (ret < 0) | |
683 | return ret; | |
684 | } | |
685 | spin_lock(&inode->i_lock); | |
686 | nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; | |
687 | if (S_ISDIR(inode->i_mode)) { | |
688 | memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); | |
689 | /* This ensures we revalidate child dentries */ | |
690 | nfsi->cache_change_attribute = jiffies; | |
691 | } | |
692 | spin_unlock(&inode->i_lock); | |
693 | nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); | |
694 | dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", | |
695 | inode->i_sb->s_id, (long long)NFS_FILEID(inode)); | |
696 | return 0; | |
697 | } | |
698 | ||
699 | static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) | |
700 | { | |
701 | int ret = 0; | |
702 | ||
703 | mutex_lock(&inode->i_mutex); | |
704 | if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_DATA) { | |
705 | ret = nfs_sync_mapping(mapping); | |
706 | if (ret == 0) | |
707 | ret = nfs_invalidate_mapping_nolock(inode, mapping); | |
708 | } | |
709 | mutex_unlock(&inode->i_mutex); | |
710 | return ret; | |
711 | } | |
712 | ||
7d52e862 | 713 | /** |
717d44e8 | 714 | * nfs_revalidate_mapping_nolock - Revalidate the pagecache |
7d52e862 TM |
715 | * @inode - pointer to host inode |
716 | * @mapping - pointer to mapping | |
717 | */ | |
717d44e8 | 718 | int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping) |
7d52e862 TM |
719 | { |
720 | struct nfs_inode *nfsi = NFS_I(inode); | |
44b11874 TM |
721 | int ret = 0; |
722 | ||
44b11874 | 723 | if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) |
717d44e8 | 724 | || nfs_attribute_timeout(inode) || NFS_STALE(inode)) { |
44b11874 | 725 | ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); |
717d44e8 TM |
726 | if (ret < 0) |
727 | goto out; | |
728 | } | |
729 | if (nfsi->cache_validity & NFS_INO_INVALID_DATA) | |
730 | ret = nfs_invalidate_mapping_nolock(inode, mapping); | |
731 | out: | |
732 | return ret; | |
733 | } | |
7d52e862 | 734 | |
717d44e8 TM |
735 | /** |
736 | * nfs_revalidate_mapping - Revalidate the pagecache | |
737 | * @inode - pointer to host inode | |
738 | * @mapping - pointer to mapping | |
739 | * | |
740 | * This version of the function will take the inode->i_mutex and attempt to | |
741 | * flush out all dirty data if it needs to invalidate the page cache. | |
742 | */ | |
743 | int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) | |
744 | { | |
745 | struct nfs_inode *nfsi = NFS_I(inode); | |
746 | int ret = 0; | |
dc59250c | 747 | |
717d44e8 TM |
748 | if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) |
749 | || nfs_attribute_timeout(inode) || NFS_STALE(inode)) { | |
750 | ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
751 | if (ret < 0) | |
752 | goto out; | |
7d52e862 | 753 | } |
717d44e8 TM |
754 | if (nfsi->cache_validity & NFS_INO_INVALID_DATA) |
755 | ret = nfs_invalidate_mapping(inode, mapping); | |
cd9ae2b6 | 756 | out: |
44b11874 | 757 | return ret; |
7d52e862 TM |
758 | } |
759 | ||
1da177e4 LT |
760 | /** |
761 | * nfs_begin_data_update | |
762 | * @inode - pointer to inode | |
763 | * Declare that a set of operations will update file data on the server | |
764 | */ | |
765 | void nfs_begin_data_update(struct inode *inode) | |
766 | { | |
767 | atomic_inc(&NFS_I(inode)->data_updates); | |
768 | } | |
769 | ||
770 | /** | |
771 | * nfs_end_data_update | |
772 | * @inode - pointer to inode | |
773 | * Declare end of the operations that will update file data | |
774 | * This will mark the inode as immediately needing revalidation | |
775 | * of its attribute cache. | |
776 | */ | |
777 | void nfs_end_data_update(struct inode *inode) | |
778 | { | |
779 | struct nfs_inode *nfsi = NFS_I(inode); | |
780 | ||
97db8f41 TM |
781 | /* Directories: invalidate page cache */ |
782 | if (S_ISDIR(inode->i_mode)) { | |
783 | spin_lock(&inode->i_lock); | |
784 | nfsi->cache_validity |= NFS_INO_INVALID_DATA; | |
785 | spin_unlock(&inode->i_lock); | |
1da177e4 | 786 | } |
913a70fc | 787 | nfsi->cache_change_attribute = jiffies; |
1da177e4 LT |
788 | atomic_dec(&nfsi->data_updates); |
789 | } | |
790 | ||
a895b4a1 TM |
791 | static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) |
792 | { | |
793 | struct nfs_inode *nfsi = NFS_I(inode); | |
b0c4fddc | 794 | unsigned long now = jiffies; |
a895b4a1 | 795 | |
a895b4a1 TM |
796 | /* If we have atomic WCC data, we may update some attributes */ |
797 | if ((fattr->valid & NFS_ATTR_WCC) != 0) { | |
798 | if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) { | |
799 | memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); | |
b0c4fddc | 800 | nfsi->cache_change_attribute = now; |
a895b4a1 TM |
801 | } |
802 | if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { | |
803 | memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); | |
b0c4fddc | 804 | nfsi->cache_change_attribute = now; |
a895b4a1 TM |
805 | } |
806 | if (inode->i_size == fattr->pre_size && nfsi->npages == 0) { | |
807 | inode->i_size = fattr->size; | |
b0c4fddc | 808 | nfsi->cache_change_attribute = now; |
a895b4a1 TM |
809 | } |
810 | } | |
811 | } | |
812 | ||
1da177e4 | 813 | /** |
33801147 | 814 | * nfs_check_inode_attributes - verify consistency of the inode attribute cache |
1da177e4 LT |
815 | * @inode - pointer to inode |
816 | * @fattr - updated attributes | |
817 | * | |
818 | * Verifies the attribute cache. If we have just changed the attributes, | |
819 | * so that fattr carries weak cache consistency data, then it may | |
820 | * also update the ctime/mtime/change_attribute. | |
821 | */ | |
33801147 | 822 | static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) |
1da177e4 LT |
823 | { |
824 | struct nfs_inode *nfsi = NFS_I(inode); | |
825 | loff_t cur_size, new_isize; | |
826 | int data_unstable; | |
827 | ||
dc59250c | 828 | |
ca62b9c3 TM |
829 | /* Has the inode gone and changed behind our back? */ |
830 | if (nfsi->fileid != fattr->fileid | |
831 | || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { | |
832 | return -EIO; | |
833 | } | |
834 | ||
1da177e4 LT |
835 | /* Are we in the process of updating data on the server? */ |
836 | data_unstable = nfs_caches_unstable(inode); | |
837 | ||
a895b4a1 TM |
838 | /* Do atomic weak cache consistency updates */ |
839 | nfs_wcc_update_inode(inode, fattr); | |
1da177e4 | 840 | |
9d1e9232 | 841 | if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 && |
f1bb0b92 TM |
842 | nfsi->change_attr != fattr->change_attr) |
843 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; | |
1da177e4 | 844 | |
1da177e4 | 845 | /* Verify a few of the more important attributes */ |
f1bb0b92 TM |
846 | if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) |
847 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; | |
ca62b9c3 TM |
848 | |
849 | cur_size = i_size_read(inode); | |
850 | new_isize = nfs_size_to_loff_t(fattr->size); | |
fb374d24 TM |
851 | if (cur_size != new_isize && nfsi->npages == 0) |
852 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; | |
1da177e4 LT |
853 | |
854 | /* Have any file permissions changed? */ | |
855 | if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) | |
856 | || inode->i_uid != fattr->uid | |
857 | || inode->i_gid != fattr->gid) | |
55296809 | 858 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; |
1da177e4 LT |
859 | |
860 | /* Has the link count changed? */ | |
861 | if (inode->i_nlink != fattr->nlink) | |
55296809 | 862 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR; |
1da177e4 LT |
863 | |
864 | if (!timespec_equal(&inode->i_atime, &fattr->atime)) | |
55296809 | 865 | nfsi->cache_validity |= NFS_INO_INVALID_ATIME; |
1da177e4 | 866 | |
33801147 | 867 | nfsi->read_cache_jiffies = fattr->time_start; |
1da177e4 LT |
868 | return 0; |
869 | } | |
870 | ||
33801147 TM |
871 | /** |
872 | * nfs_refresh_inode - try to update the inode attribute cache | |
873 | * @inode - pointer to inode | |
874 | * @fattr - updated attributes | |
875 | * | |
876 | * Check that an RPC call that returned attributes has not overlapped with | |
877 | * other recent updates of the inode metadata, then decide whether it is | |
878 | * safe to do a full update of the inode attributes, or whether just to | |
879 | * call nfs_check_inode_attributes. | |
880 | */ | |
881 | int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) | |
882 | { | |
883 | struct nfs_inode *nfsi = NFS_I(inode); | |
884 | int status; | |
885 | ||
886 | if ((fattr->valid & NFS_ATTR_FATTR) == 0) | |
887 | return 0; | |
888 | spin_lock(&inode->i_lock); | |
33801147 | 889 | if (time_after(fattr->time_start, nfsi->last_updated)) |
24aa1fe6 | 890 | status = nfs_update_inode(inode, fattr); |
33801147 TM |
891 | else |
892 | status = nfs_check_inode_attributes(inode, fattr); | |
893 | ||
894 | spin_unlock(&inode->i_lock); | |
895 | return status; | |
896 | } | |
897 | ||
decf491f TM |
898 | /** |
899 | * nfs_post_op_update_inode - try to update the inode attribute cache | |
900 | * @inode - pointer to inode | |
901 | * @fattr - updated attributes | |
902 | * | |
903 | * After an operation that has changed the inode metadata, mark the | |
904 | * attribute cache as being invalid, then try to update it. | |
f551e44f CL |
905 | * |
906 | * NB: if the server didn't return any post op attributes, this | |
907 | * function will force the retrieval of attributes before the next | |
908 | * NFS request. Thus it should be used only for operations that | |
909 | * are expected to change one or more attributes, to avoid | |
910 | * unnecessary NFS requests and trips through nfs_update_inode(). | |
decf491f TM |
911 | */ |
912 | int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) | |
913 | { | |
914 | struct nfs_inode *nfsi = NFS_I(inode); | |
915 | int status = 0; | |
916 | ||
917 | spin_lock(&inode->i_lock); | |
918 | if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) { | |
f1bb0b92 | 919 | nfsi->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; |
decf491f TM |
920 | goto out; |
921 | } | |
24aa1fe6 | 922 | status = nfs_update_inode(inode, fattr); |
decf491f TM |
923 | out: |
924 | spin_unlock(&inode->i_lock); | |
925 | return status; | |
926 | } | |
927 | ||
1da177e4 LT |
928 | /* |
929 | * Many nfs protocol calls return the new file attributes after | |
930 | * an operation. Here we update the inode to reflect the state | |
931 | * of the server's inode. | |
932 | * | |
933 | * This is a bit tricky because we have to make sure all dirty pages | |
934 | * have been sent off to the server before calling invalidate_inode_pages. | |
935 | * To make sure no other process adds more write requests while we try | |
936 | * our best to flush them, we make them sleep during the attribute refresh. | |
937 | * | |
938 | * A very similar scenario holds for the dir cache. | |
939 | */ | |
24aa1fe6 | 940 | static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) |
1da177e4 | 941 | { |
8b4bdcf8 | 942 | struct nfs_server *server; |
1da177e4 | 943 | struct nfs_inode *nfsi = NFS_I(inode); |
951a143b | 944 | loff_t cur_isize, new_isize; |
1da177e4 | 945 | unsigned int invalid = 0; |
3e7d950a | 946 | unsigned long now = jiffies; |
24aa1fe6 | 947 | int data_stable; |
1da177e4 LT |
948 | |
949 | dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n", | |
950 | __FUNCTION__, inode->i_sb->s_id, inode->i_ino, | |
951 | atomic_read(&inode->i_count), fattr->valid); | |
952 | ||
325cfed9 CL |
953 | if (nfsi->fileid != fattr->fileid) |
954 | goto out_fileid; | |
1da177e4 LT |
955 | |
956 | /* | |
957 | * Make sure the inode's type hasn't changed. | |
958 | */ | |
33801147 | 959 | if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) |
1da177e4 LT |
960 | goto out_changed; |
961 | ||
8b4bdcf8 TM |
962 | server = NFS_SERVER(inode); |
963 | /* Update the fsid if and only if this is the root directory */ | |
964 | if (inode == inode->i_sb->s_root->d_inode | |
965 | && !nfs_fsid_equal(&server->fsid, &fattr->fsid)) | |
966 | server->fsid = fattr->fsid; | |
967 | ||
1da177e4 LT |
968 | /* |
969 | * Update the read time so we don't revalidate too often. | |
970 | */ | |
33801147 | 971 | nfsi->read_cache_jiffies = fattr->time_start; |
3e7d950a TM |
972 | nfsi->last_updated = now; |
973 | ||
974 | /* Fix a wraparound issue with nfsi->cache_change_attribute */ | |
975 | if (time_before(now, nfsi->cache_change_attribute)) | |
976 | nfsi->cache_change_attribute = now - 600*HZ; | |
1da177e4 LT |
977 | |
978 | /* Are we racing with known updates of the metadata on the server? */ | |
24aa1fe6 TM |
979 | data_stable = nfs_verify_change_attribute(inode, fattr->time_start); |
980 | if (data_stable) | |
f1bb0b92 | 981 | nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_ATIME); |
1da177e4 | 982 | |
a895b4a1 TM |
983 | /* Do atomic weak cache consistency updates */ |
984 | nfs_wcc_update_inode(inode, fattr); | |
985 | ||
951a143b | 986 | /* Check if our cached file size is stale */ |
1da177e4 LT |
987 | new_isize = nfs_size_to_loff_t(fattr->size); |
988 | cur_isize = i_size_read(inode); | |
951a143b TM |
989 | if (new_isize != cur_isize) { |
990 | /* Do we perhaps have any outstanding writes? */ | |
991 | if (nfsi->npages == 0) { | |
992 | /* No, but did we race with nfs_end_data_update()? */ | |
24aa1fe6 | 993 | if (data_stable) { |
1da177e4 | 994 | inode->i_size = new_isize; |
951a143b | 995 | invalid |= NFS_INO_INVALID_DATA; |
1da177e4 | 996 | } |
951a143b TM |
997 | invalid |= NFS_INO_INVALID_ATTR; |
998 | } else if (new_isize > cur_isize) { | |
1da177e4 LT |
999 | inode->i_size = new_isize; |
1000 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; | |
1001 | } | |
3e7d950a | 1002 | nfsi->cache_change_attribute = now; |
951a143b TM |
1003 | dprintk("NFS: isize change on server for file %s/%ld\n", |
1004 | inode->i_sb->s_id, inode->i_ino); | |
1da177e4 LT |
1005 | } |
1006 | ||
951a143b | 1007 | /* Check if the mtime agrees */ |
1da177e4 LT |
1008 | if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { |
1009 | memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); | |
951a143b TM |
1010 | dprintk("NFS: mtime change on server for file %s/%ld\n", |
1011 | inode->i_sb->s_id, inode->i_ino); | |
24aa1fe6 | 1012 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; |
3e7d950a | 1013 | nfsi->cache_change_attribute = now; |
1da177e4 LT |
1014 | } |
1015 | ||
ada70d94 TM |
1016 | /* If ctime has changed we should definitely clear access+acl caches */ |
1017 | if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) { | |
24aa1fe6 | 1018 | invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
ada70d94 | 1019 | memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); |
3e7d950a | 1020 | nfsi->cache_change_attribute = now; |
ada70d94 | 1021 | } |
1da177e4 LT |
1022 | memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); |
1023 | ||
1024 | if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) || | |
1025 | inode->i_uid != fattr->uid || | |
1026 | inode->i_gid != fattr->gid) | |
ada70d94 | 1027 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
1da177e4 LT |
1028 | |
1029 | inode->i_mode = fattr->mode; | |
1030 | inode->i_nlink = fattr->nlink; | |
1031 | inode->i_uid = fattr->uid; | |
1032 | inode->i_gid = fattr->gid; | |
1033 | ||
1034 | if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) { | |
1035 | /* | |
1036 | * report the blocks in 512byte units | |
1037 | */ | |
1038 | inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); | |
1da177e4 LT |
1039 | } else { |
1040 | inode->i_blocks = fattr->du.nfs2.blocks; | |
1da177e4 LT |
1041 | } |
1042 | ||
9d1e9232 TM |
1043 | if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 && |
1044 | nfsi->change_attr != fattr->change_attr) { | |
1045 | dprintk("NFS: change_attr change on server for file %s/%ld\n", | |
1046 | inode->i_sb->s_id, inode->i_ino); | |
1047 | nfsi->change_attr = fattr->change_attr; | |
1048 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; | |
3e7d950a | 1049 | nfsi->cache_change_attribute = now; |
ca62b9c3 TM |
1050 | } |
1051 | ||
1da177e4 LT |
1052 | /* Update attrtimeo value if we're out of the unstable period */ |
1053 | if (invalid & NFS_INO_INVALID_ATTR) { | |
91d5b470 | 1054 | nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); |
1da177e4 | 1055 | nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); |
3e7d950a TM |
1056 | nfsi->attrtimeo_timestamp = now; |
1057 | } else if (time_after(now, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) { | |
1da177e4 LT |
1058 | if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode)) |
1059 | nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); | |
3e7d950a | 1060 | nfsi->attrtimeo_timestamp = now; |
1da177e4 LT |
1061 | } |
1062 | /* Don't invalidate the data if we were to blame */ | |
1063 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) | |
1064 | || S_ISLNK(inode->i_mode))) | |
1065 | invalid &= ~NFS_INO_INVALID_DATA; | |
24aa1fe6 TM |
1066 | if (data_stable) |
1067 | invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE); | |
1da177e4 | 1068 | if (!nfs_have_delegation(inode, FMODE_READ)) |
55296809 | 1069 | nfsi->cache_validity |= invalid; |
1da177e4 LT |
1070 | |
1071 | return 0; | |
1072 | out_changed: | |
1073 | /* | |
1074 | * Big trouble! The inode has become a different object. | |
1075 | */ | |
1076 | #ifdef NFS_PARANOIA | |
1077 | printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n", | |
1078 | __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode); | |
1079 | #endif | |
b37b03b7 | 1080 | out_err: |
1da177e4 LT |
1081 | /* |
1082 | * No need to worry about unhashing the dentry, as the | |
1083 | * lookup validation will know that the inode is bad. | |
1084 | * (But we fall through to invalidate the caches.) | |
1085 | */ | |
1086 | nfs_invalidate_inode(inode); | |
1da177e4 | 1087 | return -ESTALE; |
325cfed9 CL |
1088 | |
1089 | out_fileid: | |
1090 | printk(KERN_ERR "NFS: server %s error: fileid changed\n" | |
1091 | "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", | |
54ceac45 | 1092 | NFS_SERVER(inode)->nfs_client->cl_hostname, inode->i_sb->s_id, |
325cfed9 CL |
1093 | (long long)nfsi->fileid, (long long)fattr->fileid); |
1094 | goto out_err; | |
1da177e4 LT |
1095 | } |
1096 | ||
55a97593 | 1097 | |
1da177e4 LT |
1098 | #ifdef CONFIG_NFS_V4 |
1099 | ||
1da177e4 LT |
1100 | /* |
1101 | * Clean out any remaining NFSv4 state that might be left over due | |
1102 | * to open() calls that passed nfs_atomic_lookup, but failed to call | |
1103 | * nfs_open(). | |
1104 | */ | |
f7b422b1 | 1105 | void nfs4_clear_inode(struct inode *inode) |
1da177e4 LT |
1106 | { |
1107 | struct nfs_inode *nfsi = NFS_I(inode); | |
1108 | ||
1109 | /* If we are holding a delegation, return it! */ | |
cae7a073 | 1110 | nfs_inode_return_delegation(inode); |
1da177e4 LT |
1111 | /* First call standard NFS clear_inode() code */ |
1112 | nfs_clear_inode(inode); | |
1113 | /* Now clear out any remaining state */ | |
1114 | while (!list_empty(&nfsi->open_states)) { | |
1115 | struct nfs4_state *state; | |
1116 | ||
1117 | state = list_entry(nfsi->open_states.next, | |
1118 | struct nfs4_state, | |
1119 | inode_states); | |
1120 | dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n", | |
1121 | __FUNCTION__, | |
1122 | inode->i_sb->s_id, | |
1123 | (long long)NFS_FILEID(inode), | |
1124 | state); | |
1125 | BUG_ON(atomic_read(&state->count) != 1); | |
1126 | nfs4_close_state(state, state->state); | |
1127 | } | |
1128 | } | |
1da177e4 LT |
1129 | #endif |
1130 | ||
f7b422b1 | 1131 | struct inode *nfs_alloc_inode(struct super_block *sb) |
1da177e4 LT |
1132 | { |
1133 | struct nfs_inode *nfsi; | |
e94b1766 | 1134 | nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
1135 | if (!nfsi) |
1136 | return NULL; | |
55296809 CL |
1137 | nfsi->flags = 0UL; |
1138 | nfsi->cache_validity = 0UL; | |
458818ed TM |
1139 | #ifdef CONFIG_NFS_V3_ACL |
1140 | nfsi->acl_access = ERR_PTR(-EAGAIN); | |
1141 | nfsi->acl_default = ERR_PTR(-EAGAIN); | |
1142 | #endif | |
e50a1c2e BF |
1143 | #ifdef CONFIG_NFS_V4 |
1144 | nfsi->nfs4_acl = NULL; | |
1145 | #endif /* CONFIG_NFS_V4 */ | |
1da177e4 LT |
1146 | return &nfsi->vfs_inode; |
1147 | } | |
1148 | ||
f7b422b1 | 1149 | void nfs_destroy_inode(struct inode *inode) |
1da177e4 LT |
1150 | { |
1151 | kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); | |
1152 | } | |
1153 | ||
d75d5414 AM |
1154 | static inline void nfs4_init_once(struct nfs_inode *nfsi) |
1155 | { | |
1156 | #ifdef CONFIG_NFS_V4 | |
1157 | INIT_LIST_HEAD(&nfsi->open_states); | |
1158 | nfsi->delegation = NULL; | |
1159 | nfsi->delegation_state = 0; | |
1160 | init_rwsem(&nfsi->rwsem); | |
1161 | #endif | |
1162 | } | |
f7b422b1 | 1163 | |
e18b890b | 1164 | static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags) |
1da177e4 LT |
1165 | { |
1166 | struct nfs_inode *nfsi = (struct nfs_inode *) foo; | |
1167 | ||
1168 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
1169 | SLAB_CTOR_CONSTRUCTOR) { | |
1170 | inode_init_once(&nfsi->vfs_inode); | |
1171 | spin_lock_init(&nfsi->req_lock); | |
1172 | INIT_LIST_HEAD(&nfsi->dirty); | |
1173 | INIT_LIST_HEAD(&nfsi->commit); | |
1174 | INIT_LIST_HEAD(&nfsi->open_files); | |
cfcea3e8 TM |
1175 | INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); |
1176 | INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); | |
1da177e4 LT |
1177 | INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC); |
1178 | atomic_set(&nfsi->data_updates, 0); | |
1179 | nfsi->ndirty = 0; | |
1180 | nfsi->ncommit = 0; | |
1181 | nfsi->npages = 0; | |
1da177e4 LT |
1182 | nfs4_init_once(nfsi); |
1183 | } | |
1184 | } | |
1185 | ||
f7b422b1 | 1186 | static int __init nfs_init_inodecache(void) |
1da177e4 LT |
1187 | { |
1188 | nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", | |
1189 | sizeof(struct nfs_inode), | |
fffb60f9 PJ |
1190 | 0, (SLAB_RECLAIM_ACCOUNT| |
1191 | SLAB_MEM_SPREAD), | |
1da177e4 LT |
1192 | init_once, NULL); |
1193 | if (nfs_inode_cachep == NULL) | |
1194 | return -ENOMEM; | |
1195 | ||
1196 | return 0; | |
1197 | } | |
1198 | ||
266bee88 | 1199 | static void nfs_destroy_inodecache(void) |
1da177e4 | 1200 | { |
1a1d92c1 | 1201 | kmem_cache_destroy(nfs_inode_cachep); |
1da177e4 LT |
1202 | } |
1203 | ||
1204 | /* | |
1205 | * Initialize NFS | |
1206 | */ | |
1207 | static int __init init_nfs_fs(void) | |
1208 | { | |
1209 | int err; | |
1210 | ||
6aaca566 DH |
1211 | err = nfs_fs_proc_init(); |
1212 | if (err) | |
1213 | goto out5; | |
1214 | ||
1da177e4 LT |
1215 | err = nfs_init_nfspagecache(); |
1216 | if (err) | |
1217 | goto out4; | |
1218 | ||
1219 | err = nfs_init_inodecache(); | |
1220 | if (err) | |
1221 | goto out3; | |
1222 | ||
1223 | err = nfs_init_readpagecache(); | |
1224 | if (err) | |
1225 | goto out2; | |
1226 | ||
1227 | err = nfs_init_writepagecache(); | |
1228 | if (err) | |
1229 | goto out1; | |
1230 | ||
1da177e4 LT |
1231 | err = nfs_init_directcache(); |
1232 | if (err) | |
1233 | goto out0; | |
1da177e4 LT |
1234 | |
1235 | #ifdef CONFIG_PROC_FS | |
1236 | rpc_proc_register(&nfs_rpcstat); | |
1237 | #endif | |
f7b422b1 | 1238 | if ((err = register_nfs_fs()) != 0) |
1da177e4 LT |
1239 | goto out; |
1240 | return 0; | |
1241 | out: | |
1242 | #ifdef CONFIG_PROC_FS | |
1243 | rpc_proc_unregister("nfs"); | |
1244 | #endif | |
1da177e4 | 1245 | nfs_destroy_directcache(); |
6b59a754 | 1246 | out0: |
6b59a754 | 1247 | nfs_destroy_writepagecache(); |
1da177e4 LT |
1248 | out1: |
1249 | nfs_destroy_readpagecache(); | |
1250 | out2: | |
1251 | nfs_destroy_inodecache(); | |
1252 | out3: | |
1253 | nfs_destroy_nfspagecache(); | |
1254 | out4: | |
6aaca566 DH |
1255 | nfs_fs_proc_exit(); |
1256 | out5: | |
1da177e4 LT |
1257 | return err; |
1258 | } | |
1259 | ||
1260 | static void __exit exit_nfs_fs(void) | |
1261 | { | |
1da177e4 | 1262 | nfs_destroy_directcache(); |
1da177e4 LT |
1263 | nfs_destroy_writepagecache(); |
1264 | nfs_destroy_readpagecache(); | |
1265 | nfs_destroy_inodecache(); | |
1266 | nfs_destroy_nfspagecache(); | |
1267 | #ifdef CONFIG_PROC_FS | |
1268 | rpc_proc_unregister("nfs"); | |
1269 | #endif | |
f7b422b1 | 1270 | unregister_nfs_fs(); |
6aaca566 | 1271 | nfs_fs_proc_exit(); |
1da177e4 LT |
1272 | } |
1273 | ||
1274 | /* Not quite true; I just maintain it */ | |
1275 | MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); | |
1276 | MODULE_LICENSE("GPL"); | |
1277 | ||
1278 | module_init(init_nfs_fs) | |
1279 | module_exit(exit_nfs_fs) |