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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> | |
e8edc6e0 | 18 | #include <linux/sched.h> |
1da177e4 LT |
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 | |
1da177e4 | 51 | |
1da177e4 | 52 | static void nfs_invalidate_inode(struct inode *); |
24aa1fe6 | 53 | static int nfs_update_inode(struct inode *, struct nfs_fattr *); |
1da177e4 | 54 | |
ada70d94 | 55 | static void nfs_zap_acl_cache(struct inode *); |
1da177e4 | 56 | |
e18b890b | 57 | static struct kmem_cache * nfs_inode_cachep; |
b7fa0554 | 58 | |
1da177e4 LT |
59 | static inline unsigned long |
60 | nfs_fattr_to_ino_t(struct nfs_fattr *fattr) | |
61 | { | |
62 | return nfs_fileid_to_ino_t(fattr->fileid); | |
63 | } | |
64 | ||
f7b422b1 | 65 | int nfs_write_inode(struct inode *inode, int sync) |
1da177e4 | 66 | { |
1da177e4 LT |
67 | int ret; |
68 | ||
d30c8348 TM |
69 | if (sync) { |
70 | ret = filemap_fdatawait(inode->i_mapping); | |
71 | if (ret == 0) | |
72 | ret = nfs_commit_inode(inode, FLUSH_SYNC); | |
73 | } else | |
74 | ret = nfs_commit_inode(inode, 0); | |
75 | if (ret >= 0) | |
76 | return 0; | |
77 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
78 | return ret; | |
1da177e4 LT |
79 | } |
80 | ||
f7b422b1 | 81 | void nfs_clear_inode(struct inode *inode) |
1da177e4 | 82 | { |
da6d503a TM |
83 | /* |
84 | * The following should never happen... | |
85 | */ | |
86 | BUG_ON(nfs_have_writebacks(inode)); | |
1c3c07e9 TM |
87 | BUG_ON(!list_empty(&NFS_I(inode)->open_files)); |
88 | BUG_ON(atomic_read(&NFS_I(inode)->data_updates) != 0); | |
ada70d94 | 89 | nfs_zap_acl_cache(inode); |
1c3c07e9 | 90 | nfs_access_zap_cache(inode); |
1da177e4 LT |
91 | } |
92 | ||
29884df0 TM |
93 | /** |
94 | * nfs_sync_mapping - helper to flush all mmapped dirty data to disk | |
95 | */ | |
96 | int nfs_sync_mapping(struct address_space *mapping) | |
97 | { | |
98 | int ret; | |
99 | ||
100 | if (mapping->nrpages == 0) | |
101 | return 0; | |
102 | unmap_mapping_range(mapping, 0, 0, 0); | |
28fd1298 | 103 | ret = filemap_write_and_wait(mapping); |
29884df0 TM |
104 | if (ret != 0) |
105 | goto out; | |
106 | ret = nfs_wb_all(mapping->host); | |
107 | out: | |
108 | return ret; | |
109 | } | |
110 | ||
1da177e4 LT |
111 | /* |
112 | * Invalidate the local caches | |
113 | */ | |
b37b03b7 | 114 | static void nfs_zap_caches_locked(struct inode *inode) |
1da177e4 LT |
115 | { |
116 | struct nfs_inode *nfsi = NFS_I(inode); | |
117 | int mode = inode->i_mode; | |
118 | ||
91d5b470 CL |
119 | nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); |
120 | ||
1da177e4 LT |
121 | NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode); |
122 | NFS_ATTRTIMEO_UPDATE(inode) = jiffies; | |
123 | ||
124 | memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode))); | |
125 | if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) | |
55296809 | 126 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; |
1da177e4 | 127 | else |
55296809 | 128 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; |
b37b03b7 | 129 | } |
dc59250c | 130 | |
b37b03b7 TM |
131 | void nfs_zap_caches(struct inode *inode) |
132 | { | |
133 | spin_lock(&inode->i_lock); | |
134 | nfs_zap_caches_locked(inode); | |
dc59250c | 135 | spin_unlock(&inode->i_lock); |
ada70d94 TM |
136 | } |
137 | ||
cd9ae2b6 TM |
138 | void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) |
139 | { | |
140 | if (mapping->nrpages != 0) { | |
141 | spin_lock(&inode->i_lock); | |
142 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; | |
143 | spin_unlock(&inode->i_lock); | |
144 | } | |
145 | } | |
146 | ||
ada70d94 TM |
147 | static void nfs_zap_acl_cache(struct inode *inode) |
148 | { | |
149 | void (*clear_acl_cache)(struct inode *); | |
150 | ||
151 | clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; | |
152 | if (clear_acl_cache != NULL) | |
153 | clear_acl_cache(inode); | |
dc59250c | 154 | spin_lock(&inode->i_lock); |
55296809 | 155 | NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; |
dc59250c | 156 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
157 | } |
158 | ||
c4812998 TM |
159 | void nfs_invalidate_atime(struct inode *inode) |
160 | { | |
161 | spin_lock(&inode->i_lock); | |
162 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME; | |
163 | spin_unlock(&inode->i_lock); | |
164 | } | |
165 | ||
1da177e4 | 166 | /* |
b37b03b7 TM |
167 | * Invalidate, but do not unhash, the inode. |
168 | * NB: must be called with inode->i_lock held! | |
1da177e4 | 169 | */ |
b37b03b7 | 170 | static void nfs_invalidate_inode(struct inode *inode) |
1da177e4 | 171 | { |
b37b03b7 TM |
172 | set_bit(NFS_INO_STALE, &NFS_FLAGS(inode)); |
173 | nfs_zap_caches_locked(inode); | |
1da177e4 LT |
174 | } |
175 | ||
176 | struct nfs_find_desc { | |
177 | struct nfs_fh *fh; | |
178 | struct nfs_fattr *fattr; | |
179 | }; | |
180 | ||
181 | /* | |
182 | * In NFSv3 we can have 64bit inode numbers. In order to support | |
183 | * this, and re-exported directories (also seen in NFSv2) | |
184 | * we are forced to allow 2 different inodes to have the same | |
185 | * i_ino. | |
186 | */ | |
187 | static int | |
188 | nfs_find_actor(struct inode *inode, void *opaque) | |
189 | { | |
190 | struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; | |
191 | struct nfs_fh *fh = desc->fh; | |
192 | struct nfs_fattr *fattr = desc->fattr; | |
193 | ||
194 | if (NFS_FILEID(inode) != fattr->fileid) | |
195 | return 0; | |
196 | if (nfs_compare_fh(NFS_FH(inode), fh)) | |
197 | return 0; | |
198 | if (is_bad_inode(inode) || NFS_STALE(inode)) | |
199 | return 0; | |
200 | return 1; | |
201 | } | |
202 | ||
203 | static int | |
204 | nfs_init_locked(struct inode *inode, void *opaque) | |
205 | { | |
206 | struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; | |
207 | struct nfs_fattr *fattr = desc->fattr; | |
208 | ||
209 | NFS_FILEID(inode) = fattr->fileid; | |
210 | nfs_copy_fh(NFS_FH(inode), desc->fh); | |
211 | return 0; | |
212 | } | |
213 | ||
214 | /* Don't use READDIRPLUS on directories that we believe are too large */ | |
215 | #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE) | |
216 | ||
217 | /* | |
218 | * This is our front-end to iget that looks up inodes by file handle | |
219 | * instead of inode number. | |
220 | */ | |
221 | struct inode * | |
222 | nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) | |
223 | { | |
224 | struct nfs_find_desc desc = { | |
225 | .fh = fh, | |
226 | .fattr = fattr | |
227 | }; | |
03f28e3a | 228 | struct inode *inode = ERR_PTR(-ENOENT); |
1da177e4 LT |
229 | unsigned long hash; |
230 | ||
231 | if ((fattr->valid & NFS_ATTR_FATTR) == 0) | |
232 | goto out_no_inode; | |
233 | ||
234 | if (!fattr->nlink) { | |
235 | printk("NFS: Buggy server - nlink == 0!\n"); | |
236 | goto out_no_inode; | |
237 | } | |
238 | ||
239 | hash = nfs_fattr_to_ino_t(fattr); | |
240 | ||
03f28e3a TM |
241 | inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); |
242 | if (inode == NULL) { | |
243 | inode = ERR_PTR(-ENOMEM); | |
1da177e4 | 244 | goto out_no_inode; |
03f28e3a | 245 | } |
1da177e4 LT |
246 | |
247 | if (inode->i_state & I_NEW) { | |
248 | struct nfs_inode *nfsi = NFS_I(inode); | |
b0c4fddc | 249 | unsigned long now = jiffies; |
1da177e4 LT |
250 | |
251 | /* We set i_ino for the few things that still rely on it, | |
252 | * such as stat(2) */ | |
253 | inode->i_ino = hash; | |
254 | ||
255 | /* We can't support update_atime(), since the server will reset it */ | |
256 | inode->i_flags |= S_NOATIME|S_NOCMTIME; | |
257 | inode->i_mode = fattr->mode; | |
258 | /* Why so? Because we want revalidate for devices/FIFOs, and | |
259 | * that's precisely what we have in nfs_file_inode_operations. | |
260 | */ | |
8fa5c000 | 261 | inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops; |
1da177e4 LT |
262 | if (S_ISREG(inode->i_mode)) { |
263 | inode->i_fop = &nfs_file_operations; | |
264 | inode->i_data.a_ops = &nfs_file_aops; | |
265 | inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info; | |
266 | } else if (S_ISDIR(inode->i_mode)) { | |
8fa5c000 | 267 | inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; |
1da177e4 LT |
268 | inode->i_fop = &nfs_dir_operations; |
269 | if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS) | |
270 | && fattr->size <= NFS_LIMIT_READDIRPLUS) | |
412d582e | 271 | set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); |
55a97593 TM |
272 | /* Deal with crossing mountpoints */ |
273 | if (!nfs_fsid_equal(&NFS_SB(sb)->fsid, &fattr->fsid)) { | |
6b97fd3d MN |
274 | if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) |
275 | inode->i_op = &nfs_referral_inode_operations; | |
276 | else | |
277 | inode->i_op = &nfs_mountpoint_inode_operations; | |
55a97593 TM |
278 | inode->i_fop = NULL; |
279 | } | |
1da177e4 LT |
280 | } else if (S_ISLNK(inode->i_mode)) |
281 | inode->i_op = &nfs_symlink_inode_operations; | |
282 | else | |
283 | init_special_inode(inode, inode->i_mode, fattr->rdev); | |
284 | ||
33801147 | 285 | nfsi->read_cache_jiffies = fattr->time_start; |
b0c4fddc TM |
286 | nfsi->last_updated = now; |
287 | nfsi->cache_change_attribute = now; | |
1da177e4 LT |
288 | inode->i_atime = fattr->atime; |
289 | inode->i_mtime = fattr->mtime; | |
290 | inode->i_ctime = fattr->ctime; | |
291 | if (fattr->valid & NFS_ATTR_FATTR_V4) | |
292 | nfsi->change_attr = fattr->change_attr; | |
293 | inode->i_size = nfs_size_to_loff_t(fattr->size); | |
294 | inode->i_nlink = fattr->nlink; | |
295 | inode->i_uid = fattr->uid; | |
296 | inode->i_gid = fattr->gid; | |
297 | if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) { | |
298 | /* | |
299 | * report the blocks in 512byte units | |
300 | */ | |
301 | inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); | |
1da177e4 LT |
302 | } else { |
303 | inode->i_blocks = fattr->du.nfs2.blocks; | |
1da177e4 LT |
304 | } |
305 | nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); | |
b0c4fddc | 306 | nfsi->attrtimeo_timestamp = now; |
1da177e4 | 307 | memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); |
1c3c07e9 | 308 | nfsi->access_cache = RB_ROOT; |
1da177e4 LT |
309 | |
310 | unlock_new_inode(inode); | |
311 | } else | |
312 | nfs_refresh_inode(inode, fattr); | |
313 | dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n", | |
314 | inode->i_sb->s_id, | |
315 | (long long)NFS_FILEID(inode), | |
316 | atomic_read(&inode->i_count)); | |
317 | ||
318 | out: | |
319 | return inode; | |
320 | ||
321 | out_no_inode: | |
03f28e3a | 322 | dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); |
1da177e4 LT |
323 | goto out; |
324 | } | |
325 | ||
326 | #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET) | |
327 | ||
328 | int | |
329 | nfs_setattr(struct dentry *dentry, struct iattr *attr) | |
330 | { | |
331 | struct inode *inode = dentry->d_inode; | |
332 | struct nfs_fattr fattr; | |
333 | int error; | |
334 | ||
91d5b470 CL |
335 | nfs_inc_stats(inode, NFSIOS_VFSSETATTR); |
336 | ||
1da177e4 LT |
337 | if (attr->ia_valid & ATTR_SIZE) { |
338 | if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode)) | |
339 | attr->ia_valid &= ~ATTR_SIZE; | |
340 | } | |
341 | ||
342 | /* Optimization: if the end result is no change, don't RPC */ | |
343 | attr->ia_valid &= NFS_VALID_ATTRS; | |
344 | if (attr->ia_valid == 0) | |
345 | return 0; | |
346 | ||
347 | lock_kernel(); | |
348 | nfs_begin_data_update(inode); | |
755c1e20 | 349 | /* Write all dirty data */ |
e1552e19 TM |
350 | if (S_ISREG(inode->i_mode)) { |
351 | filemap_write_and_wait(inode->i_mapping); | |
352 | nfs_wb_all(inode); | |
353 | } | |
642ac549 TM |
354 | /* |
355 | * Return any delegations if we're going to change ACLs | |
356 | */ | |
357 | if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) | |
358 | nfs_inode_return_delegation(inode); | |
1da177e4 | 359 | error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr); |
65e4308d | 360 | if (error == 0) |
1da177e4 | 361 | nfs_refresh_inode(inode, &fattr); |
65e4308d TM |
362 | nfs_end_data_update(inode); |
363 | unlock_kernel(); | |
364 | return error; | |
365 | } | |
366 | ||
367 | /** | |
368 | * nfs_setattr_update_inode - Update inode metadata after a setattr call. | |
369 | * @inode: pointer to struct inode | |
370 | * @attr: pointer to struct iattr | |
371 | * | |
372 | * Note: we do this in the *proc.c in order to ensure that | |
373 | * it works for things like exclusive creates too. | |
374 | */ | |
375 | void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr) | |
376 | { | |
377 | if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { | |
1da177e4 | 378 | if ((attr->ia_valid & ATTR_MODE) != 0) { |
65e4308d TM |
379 | int mode = attr->ia_mode & S_IALLUGO; |
380 | mode |= inode->i_mode & ~S_IALLUGO; | |
1da177e4 LT |
381 | inode->i_mode = mode; |
382 | } | |
383 | if ((attr->ia_valid & ATTR_UID) != 0) | |
384 | inode->i_uid = attr->ia_uid; | |
385 | if ((attr->ia_valid & ATTR_GID) != 0) | |
386 | inode->i_gid = attr->ia_gid; | |
dc59250c | 387 | spin_lock(&inode->i_lock); |
55296809 | 388 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
dc59250c | 389 | spin_unlock(&inode->i_lock); |
65e4308d TM |
390 | } |
391 | if ((attr->ia_valid & ATTR_SIZE) != 0) { | |
91d5b470 | 392 | nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); |
65e4308d TM |
393 | inode->i_size = attr->ia_size; |
394 | vmtruncate(inode, attr->ia_size); | |
395 | } | |
1da177e4 LT |
396 | } |
397 | ||
412d582e CL |
398 | static int nfs_wait_schedule(void *word) |
399 | { | |
400 | if (signal_pending(current)) | |
401 | return -ERESTARTSYS; | |
402 | schedule(); | |
403 | return 0; | |
404 | } | |
405 | ||
1da177e4 LT |
406 | /* |
407 | * Wait for the inode to get unlocked. | |
1da177e4 | 408 | */ |
412d582e | 409 | static int nfs_wait_on_inode(struct inode *inode) |
1da177e4 LT |
410 | { |
411 | struct rpc_clnt *clnt = NFS_CLIENT(inode); | |
412 | struct nfs_inode *nfsi = NFS_I(inode); | |
412d582e | 413 | sigset_t oldmask; |
1da177e4 | 414 | int error; |
412d582e | 415 | |
412d582e CL |
416 | rpc_clnt_sigmask(clnt, &oldmask); |
417 | error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING, | |
418 | nfs_wait_schedule, TASK_INTERRUPTIBLE); | |
419 | rpc_clnt_sigunmask(clnt, &oldmask); | |
412d582e | 420 | |
1da177e4 LT |
421 | return error; |
422 | } | |
423 | ||
412d582e CL |
424 | static void nfs_wake_up_inode(struct inode *inode) |
425 | { | |
426 | struct nfs_inode *nfsi = NFS_I(inode); | |
427 | ||
428 | clear_bit(NFS_INO_REVALIDATING, &nfsi->flags); | |
429 | smp_mb__after_clear_bit(); | |
430 | wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING); | |
431 | } | |
432 | ||
1da177e4 LT |
433 | int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
434 | { | |
435 | struct inode *inode = dentry->d_inode; | |
55296809 | 436 | int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; |
1da177e4 LT |
437 | int err; |
438 | ||
70b9ecbd | 439 | /* Flush out writes to the server in order to update c/mtime */ |
63470738 | 440 | if (S_ISREG(inode->i_mode)) |
ed90ef51 | 441 | nfs_wb_nocommit(inode); |
fc33a7bb CH |
442 | |
443 | /* | |
444 | * We may force a getattr if the user cares about atime. | |
445 | * | |
446 | * Note that we only have to check the vfsmount flags here: | |
447 | * - NFS always sets S_NOATIME by so checking it would give a | |
448 | * bogus result | |
449 | * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is | |
450 | * no point in checking those. | |
451 | */ | |
452 | if ((mnt->mnt_flags & MNT_NOATIME) || | |
453 | ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) | |
1da177e4 | 454 | need_atime = 0; |
fc33a7bb | 455 | |
1da177e4 LT |
456 | if (need_atime) |
457 | err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
458 | else | |
459 | err = nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
4e769b93 | 460 | if (!err) { |
1da177e4 | 461 | generic_fillattr(inode, stat); |
4e769b93 PS |
462 | stat->ino = NFS_FILEID(inode); |
463 | } | |
1da177e4 LT |
464 | return err; |
465 | } | |
466 | ||
b92dccf6 | 467 | static struct nfs_open_context *alloc_nfs_open_context(struct vfsmount *mnt, struct dentry *dentry, struct rpc_cred *cred) |
1da177e4 LT |
468 | { |
469 | struct nfs_open_context *ctx; | |
470 | ||
f52720ca | 471 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); |
1da177e4 | 472 | if (ctx != NULL) { |
88be9f99 TM |
473 | ctx->path.dentry = dget(dentry); |
474 | ctx->path.mnt = mntget(mnt); | |
1da177e4 LT |
475 | ctx->cred = get_rpccred(cred); |
476 | ctx->state = NULL; | |
477 | ctx->lockowner = current->files; | |
478 | ctx->error = 0; | |
00a92642 | 479 | ctx->dir_cookie = 0; |
5e11934d | 480 | atomic_set(&ctx->count, 1); |
1da177e4 LT |
481 | } |
482 | return ctx; | |
483 | } | |
484 | ||
485 | struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) | |
486 | { | |
487 | if (ctx != NULL) | |
5e11934d | 488 | atomic_inc(&ctx->count); |
1da177e4 LT |
489 | return ctx; |
490 | } | |
491 | ||
5e11934d | 492 | void put_nfs_open_context(struct nfs_open_context *ctx) |
1da177e4 | 493 | { |
5e11934d | 494 | struct inode *inode = ctx->path.dentry->d_inode; |
3bec63db | 495 | |
5e11934d TM |
496 | if (!atomic_dec_and_lock(&ctx->count, &inode->i_lock)) |
497 | return; | |
498 | list_del(&ctx->list); | |
499 | spin_unlock(&inode->i_lock); | |
3bec63db TM |
500 | if (ctx->state != NULL) |
501 | nfs4_close_state(&ctx->path, ctx->state, ctx->mode); | |
502 | if (ctx->cred != NULL) | |
503 | put_rpccred(ctx->cred); | |
504 | dput(ctx->path.dentry); | |
505 | mntput(ctx->path.mnt); | |
506 | kfree(ctx); | |
507 | } | |
508 | ||
1da177e4 LT |
509 | /* |
510 | * Ensure that mmap has a recent RPC credential for use when writing out | |
511 | * shared pages | |
512 | */ | |
b92dccf6 | 513 | static void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) |
1da177e4 | 514 | { |
01cce933 | 515 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
516 | struct nfs_inode *nfsi = NFS_I(inode); |
517 | ||
518 | filp->private_data = get_nfs_open_context(ctx); | |
519 | spin_lock(&inode->i_lock); | |
520 | list_add(&ctx->list, &nfsi->open_files); | |
521 | spin_unlock(&inode->i_lock); | |
522 | } | |
523 | ||
d530838b TM |
524 | /* |
525 | * Given an inode, search for an open context with the desired characteristics | |
526 | */ | |
527 | struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode) | |
1da177e4 LT |
528 | { |
529 | struct nfs_inode *nfsi = NFS_I(inode); | |
530 | struct nfs_open_context *pos, *ctx = NULL; | |
531 | ||
532 | spin_lock(&inode->i_lock); | |
533 | list_for_each_entry(pos, &nfsi->open_files, list) { | |
d530838b TM |
534 | if (cred != NULL && pos->cred != cred) |
535 | continue; | |
1da177e4 LT |
536 | if ((pos->mode & mode) == mode) { |
537 | ctx = get_nfs_open_context(pos); | |
538 | break; | |
539 | } | |
540 | } | |
541 | spin_unlock(&inode->i_lock); | |
542 | return ctx; | |
543 | } | |
544 | ||
b92dccf6 | 545 | static void nfs_file_clear_open_context(struct file *filp) |
1da177e4 | 546 | { |
01cce933 | 547 | struct inode *inode = filp->f_path.dentry->d_inode; |
cd3758e3 | 548 | struct nfs_open_context *ctx = nfs_file_open_context(filp); |
1da177e4 LT |
549 | |
550 | if (ctx) { | |
551 | filp->private_data = NULL; | |
552 | spin_lock(&inode->i_lock); | |
553 | list_move_tail(&ctx->list, &NFS_I(inode)->open_files); | |
554 | spin_unlock(&inode->i_lock); | |
555 | put_nfs_open_context(ctx); | |
556 | } | |
557 | } | |
558 | ||
559 | /* | |
560 | * These allocate and release file read/write context information. | |
561 | */ | |
562 | int nfs_open(struct inode *inode, struct file *filp) | |
563 | { | |
564 | struct nfs_open_context *ctx; | |
565 | struct rpc_cred *cred; | |
566 | ||
567 | cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0); | |
568 | if (IS_ERR(cred)) | |
569 | return PTR_ERR(cred); | |
01cce933 | 570 | ctx = alloc_nfs_open_context(filp->f_path.mnt, filp->f_path.dentry, cred); |
1da177e4 LT |
571 | put_rpccred(cred); |
572 | if (ctx == NULL) | |
573 | return -ENOMEM; | |
574 | ctx->mode = filp->f_mode; | |
575 | nfs_file_set_open_context(filp, ctx); | |
576 | put_nfs_open_context(ctx); | |
1da177e4 LT |
577 | return 0; |
578 | } | |
579 | ||
580 | int nfs_release(struct inode *inode, struct file *filp) | |
581 | { | |
1da177e4 LT |
582 | nfs_file_clear_open_context(filp); |
583 | return 0; | |
584 | } | |
585 | ||
586 | /* | |
587 | * This function is called whenever some part of NFS notices that | |
588 | * the cached attributes have to be refreshed. | |
589 | */ | |
590 | int | |
591 | __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) | |
592 | { | |
593 | int status = -ESTALE; | |
594 | struct nfs_fattr fattr; | |
595 | struct nfs_inode *nfsi = NFS_I(inode); | |
1da177e4 LT |
596 | |
597 | dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n", | |
598 | inode->i_sb->s_id, (long long)NFS_FILEID(inode)); | |
599 | ||
1842bfb4 | 600 | nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); |
1da177e4 | 601 | lock_kernel(); |
85233a7a | 602 | if (is_bad_inode(inode)) |
1da177e4 LT |
603 | goto out_nowait; |
604 | if (NFS_STALE(inode)) | |
605 | goto out_nowait; | |
606 | ||
412d582e CL |
607 | status = nfs_wait_on_inode(inode); |
608 | if (status < 0) | |
609 | goto out; | |
7fdc49c4 TM |
610 | |
611 | status = -ESTALE; | |
612 | if (NFS_STALE(inode)) | |
613 | goto out; | |
1da177e4 | 614 | |
1da177e4 LT |
615 | status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr); |
616 | if (status != 0) { | |
617 | dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n", | |
618 | inode->i_sb->s_id, | |
619 | (long long)NFS_FILEID(inode), status); | |
620 | if (status == -ESTALE) { | |
621 | nfs_zap_caches(inode); | |
622 | if (!S_ISDIR(inode->i_mode)) | |
412d582e | 623 | set_bit(NFS_INO_STALE, &NFS_FLAGS(inode)); |
1da177e4 LT |
624 | } |
625 | goto out; | |
626 | } | |
627 | ||
33801147 | 628 | spin_lock(&inode->i_lock); |
24aa1fe6 | 629 | status = nfs_update_inode(inode, &fattr); |
1da177e4 | 630 | if (status) { |
33801147 | 631 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
632 | dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n", |
633 | inode->i_sb->s_id, | |
634 | (long long)NFS_FILEID(inode), status); | |
635 | goto out; | |
636 | } | |
dc59250c | 637 | spin_unlock(&inode->i_lock); |
55296809 | 638 | |
24aa1fe6 | 639 | if (nfsi->cache_validity & NFS_INO_INVALID_ACL) |
ada70d94 | 640 | nfs_zap_acl_cache(inode); |
55296809 | 641 | |
1da177e4 LT |
642 | dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n", |
643 | inode->i_sb->s_id, | |
644 | (long long)NFS_FILEID(inode)); | |
645 | ||
412d582e CL |
646 | out: |
647 | nfs_wake_up_inode(inode); | |
648 | ||
1da177e4 LT |
649 | out_nowait: |
650 | unlock_kernel(); | |
651 | return status; | |
652 | } | |
653 | ||
654 | int nfs_attribute_timeout(struct inode *inode) | |
655 | { | |
656 | struct nfs_inode *nfsi = NFS_I(inode); | |
657 | ||
658 | if (nfs_have_delegation(inode, FMODE_READ)) | |
659 | return 0; | |
c7e15961 | 660 | return !time_in_range(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); |
1da177e4 LT |
661 | } |
662 | ||
663 | /** | |
664 | * nfs_revalidate_inode - Revalidate the inode attributes | |
665 | * @server - pointer to nfs_server struct | |
666 | * @inode - pointer to inode struct | |
667 | * | |
668 | * Updates inode attribute information by retrieving the data from the server. | |
669 | */ | |
670 | int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) | |
671 | { | |
44b11874 | 672 | if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR) |
1da177e4 LT |
673 | && !nfs_attribute_timeout(inode)) |
674 | return NFS_STALE(inode) ? -ESTALE : 0; | |
675 | return __nfs_revalidate_inode(server, inode); | |
676 | } | |
677 | ||
717d44e8 TM |
678 | static int nfs_invalidate_mapping_nolock(struct inode *inode, struct address_space *mapping) |
679 | { | |
680 | struct nfs_inode *nfsi = NFS_I(inode); | |
681 | ||
682 | if (mapping->nrpages != 0) { | |
683 | int ret = invalidate_inode_pages2(mapping); | |
684 | if (ret < 0) | |
685 | return ret; | |
686 | } | |
687 | spin_lock(&inode->i_lock); | |
688 | nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; | |
689 | if (S_ISDIR(inode->i_mode)) { | |
690 | memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); | |
691 | /* This ensures we revalidate child dentries */ | |
692 | nfsi->cache_change_attribute = jiffies; | |
693 | } | |
694 | spin_unlock(&inode->i_lock); | |
695 | nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); | |
696 | dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", | |
697 | inode->i_sb->s_id, (long long)NFS_FILEID(inode)); | |
698 | return 0; | |
699 | } | |
700 | ||
701 | static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) | |
702 | { | |
703 | int ret = 0; | |
704 | ||
705 | mutex_lock(&inode->i_mutex); | |
706 | if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_DATA) { | |
707 | ret = nfs_sync_mapping(mapping); | |
708 | if (ret == 0) | |
709 | ret = nfs_invalidate_mapping_nolock(inode, mapping); | |
710 | } | |
711 | mutex_unlock(&inode->i_mutex); | |
712 | return ret; | |
713 | } | |
714 | ||
7d52e862 | 715 | /** |
717d44e8 | 716 | * nfs_revalidate_mapping_nolock - Revalidate the pagecache |
7d52e862 TM |
717 | * @inode - pointer to host inode |
718 | * @mapping - pointer to mapping | |
719 | */ | |
717d44e8 | 720 | int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping) |
7d52e862 TM |
721 | { |
722 | struct nfs_inode *nfsi = NFS_I(inode); | |
44b11874 TM |
723 | int ret = 0; |
724 | ||
44b11874 | 725 | if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) |
717d44e8 | 726 | || nfs_attribute_timeout(inode) || NFS_STALE(inode)) { |
44b11874 | 727 | ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); |
717d44e8 TM |
728 | if (ret < 0) |
729 | goto out; | |
730 | } | |
731 | if (nfsi->cache_validity & NFS_INO_INVALID_DATA) | |
732 | ret = nfs_invalidate_mapping_nolock(inode, mapping); | |
733 | out: | |
734 | return ret; | |
735 | } | |
7d52e862 | 736 | |
717d44e8 TM |
737 | /** |
738 | * nfs_revalidate_mapping - Revalidate the pagecache | |
739 | * @inode - pointer to host inode | |
740 | * @mapping - pointer to mapping | |
741 | * | |
742 | * This version of the function will take the inode->i_mutex and attempt to | |
743 | * flush out all dirty data if it needs to invalidate the page cache. | |
744 | */ | |
745 | int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) | |
746 | { | |
747 | struct nfs_inode *nfsi = NFS_I(inode); | |
748 | int ret = 0; | |
dc59250c | 749 | |
717d44e8 TM |
750 | if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) |
751 | || nfs_attribute_timeout(inode) || NFS_STALE(inode)) { | |
752 | ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
753 | if (ret < 0) | |
754 | goto out; | |
7d52e862 | 755 | } |
717d44e8 TM |
756 | if (nfsi->cache_validity & NFS_INO_INVALID_DATA) |
757 | ret = nfs_invalidate_mapping(inode, mapping); | |
cd9ae2b6 | 758 | out: |
44b11874 | 759 | return ret; |
7d52e862 TM |
760 | } |
761 | ||
1da177e4 LT |
762 | /** |
763 | * nfs_begin_data_update | |
764 | * @inode - pointer to inode | |
765 | * Declare that a set of operations will update file data on the server | |
766 | */ | |
767 | void nfs_begin_data_update(struct inode *inode) | |
768 | { | |
769 | atomic_inc(&NFS_I(inode)->data_updates); | |
770 | } | |
771 | ||
772 | /** | |
773 | * nfs_end_data_update | |
774 | * @inode - pointer to inode | |
775 | * Declare end of the operations that will update file data | |
776 | * This will mark the inode as immediately needing revalidation | |
777 | * of its attribute cache. | |
778 | */ | |
779 | void nfs_end_data_update(struct inode *inode) | |
780 | { | |
781 | struct nfs_inode *nfsi = NFS_I(inode); | |
782 | ||
97db8f41 TM |
783 | /* Directories: invalidate page cache */ |
784 | if (S_ISDIR(inode->i_mode)) { | |
785 | spin_lock(&inode->i_lock); | |
786 | nfsi->cache_validity |= NFS_INO_INVALID_DATA; | |
787 | spin_unlock(&inode->i_lock); | |
1da177e4 | 788 | } |
1da177e4 LT |
789 | atomic_dec(&nfsi->data_updates); |
790 | } | |
791 | ||
a895b4a1 TM |
792 | static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) |
793 | { | |
794 | struct nfs_inode *nfsi = NFS_I(inode); | |
795 | ||
70ca8852 TM |
796 | if ((fattr->valid & NFS_ATTR_WCC_V4) != 0 && |
797 | nfsi->change_attr == fattr->pre_change_attr) { | |
798 | nfsi->change_attr = fattr->change_attr; | |
799 | if (S_ISDIR(inode->i_mode)) | |
800 | nfsi->cache_validity |= NFS_INO_INVALID_DATA; | |
801 | } | |
a895b4a1 TM |
802 | /* If we have atomic WCC data, we may update some attributes */ |
803 | if ((fattr->valid & NFS_ATTR_WCC) != 0) { | |
17cadc95 | 804 | if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) |
a895b4a1 | 805 | memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); |
a895b4a1 TM |
806 | if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { |
807 | memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); | |
e323ea46 TM |
808 | if (S_ISDIR(inode->i_mode)) |
809 | nfsi->cache_validity |= NFS_INO_INVALID_DATA; | |
a895b4a1 | 810 | } |
17cadc95 | 811 | if (inode->i_size == fattr->pre_size && nfsi->npages == 0) |
a895b4a1 | 812 | inode->i_size = fattr->size; |
a895b4a1 TM |
813 | } |
814 | } | |
815 | ||
1da177e4 | 816 | /** |
33801147 | 817 | * nfs_check_inode_attributes - verify consistency of the inode attribute cache |
1da177e4 LT |
818 | * @inode - pointer to inode |
819 | * @fattr - updated attributes | |
820 | * | |
821 | * Verifies the attribute cache. If we have just changed the attributes, | |
822 | * so that fattr carries weak cache consistency data, then it may | |
823 | * also update the ctime/mtime/change_attribute. | |
824 | */ | |
33801147 | 825 | static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) |
1da177e4 LT |
826 | { |
827 | struct nfs_inode *nfsi = NFS_I(inode); | |
828 | loff_t cur_size, new_isize; | |
829 | int data_unstable; | |
830 | ||
dc59250c | 831 | |
ca62b9c3 TM |
832 | /* Has the inode gone and changed behind our back? */ |
833 | if (nfsi->fileid != fattr->fileid | |
834 | || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) { | |
835 | return -EIO; | |
836 | } | |
837 | ||
1da177e4 LT |
838 | /* Are we in the process of updating data on the server? */ |
839 | data_unstable = nfs_caches_unstable(inode); | |
840 | ||
a895b4a1 TM |
841 | /* Do atomic weak cache consistency updates */ |
842 | nfs_wcc_update_inode(inode, fattr); | |
1da177e4 | 843 | |
9d1e9232 | 844 | if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 && |
f1bb0b92 TM |
845 | nfsi->change_attr != fattr->change_attr) |
846 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; | |
1da177e4 | 847 | |
1da177e4 | 848 | /* Verify a few of the more important attributes */ |
f1bb0b92 TM |
849 | if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) |
850 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; | |
ca62b9c3 TM |
851 | |
852 | cur_size = i_size_read(inode); | |
853 | new_isize = nfs_size_to_loff_t(fattr->size); | |
fb374d24 TM |
854 | if (cur_size != new_isize && nfsi->npages == 0) |
855 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; | |
1da177e4 LT |
856 | |
857 | /* Have any file permissions changed? */ | |
858 | if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) | |
859 | || inode->i_uid != fattr->uid | |
860 | || inode->i_gid != fattr->gid) | |
55296809 | 861 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; |
1da177e4 LT |
862 | |
863 | /* Has the link count changed? */ | |
864 | if (inode->i_nlink != fattr->nlink) | |
55296809 | 865 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR; |
1da177e4 LT |
866 | |
867 | if (!timespec_equal(&inode->i_atime, &fattr->atime)) | |
55296809 | 868 | nfsi->cache_validity |= NFS_INO_INVALID_ATIME; |
1da177e4 | 869 | |
33801147 | 870 | nfsi->read_cache_jiffies = fattr->time_start; |
1da177e4 LT |
871 | return 0; |
872 | } | |
873 | ||
33801147 TM |
874 | /** |
875 | * nfs_refresh_inode - try to update the inode attribute cache | |
876 | * @inode - pointer to inode | |
877 | * @fattr - updated attributes | |
878 | * | |
879 | * Check that an RPC call that returned attributes has not overlapped with | |
880 | * other recent updates of the inode metadata, then decide whether it is | |
881 | * safe to do a full update of the inode attributes, or whether just to | |
882 | * call nfs_check_inode_attributes. | |
883 | */ | |
884 | int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) | |
885 | { | |
886 | struct nfs_inode *nfsi = NFS_I(inode); | |
887 | int status; | |
888 | ||
889 | if ((fattr->valid & NFS_ATTR_FATTR) == 0) | |
890 | return 0; | |
891 | spin_lock(&inode->i_lock); | |
33801147 | 892 | if (time_after(fattr->time_start, nfsi->last_updated)) |
24aa1fe6 | 893 | status = nfs_update_inode(inode, fattr); |
33801147 TM |
894 | else |
895 | status = nfs_check_inode_attributes(inode, fattr); | |
896 | ||
897 | spin_unlock(&inode->i_lock); | |
898 | return status; | |
899 | } | |
900 | ||
decf491f TM |
901 | /** |
902 | * nfs_post_op_update_inode - try to update the inode attribute cache | |
903 | * @inode - pointer to inode | |
904 | * @fattr - updated attributes | |
905 | * | |
906 | * After an operation that has changed the inode metadata, mark the | |
907 | * attribute cache as being invalid, then try to update it. | |
f551e44f CL |
908 | * |
909 | * NB: if the server didn't return any post op attributes, this | |
910 | * function will force the retrieval of attributes before the next | |
911 | * NFS request. Thus it should be used only for operations that | |
912 | * are expected to change one or more attributes, to avoid | |
913 | * unnecessary NFS requests and trips through nfs_update_inode(). | |
decf491f TM |
914 | */ |
915 | int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) | |
916 | { | |
917 | struct nfs_inode *nfsi = NFS_I(inode); | |
918 | int status = 0; | |
919 | ||
decf491f | 920 | if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) { |
68e8a70d | 921 | spin_lock(&inode->i_lock); |
f1bb0b92 | 922 | nfsi->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; |
17cadc95 | 923 | nfsi->cache_change_attribute = jiffies; |
68e8a70d | 924 | spin_unlock(&inode->i_lock); |
decf491f TM |
925 | goto out; |
926 | } | |
68e8a70d | 927 | status = nfs_refresh_inode(inode, fattr); |
decf491f | 928 | out: |
decf491f TM |
929 | return status; |
930 | } | |
931 | ||
70ca8852 TM |
932 | /** |
933 | * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache | |
934 | * @inode - pointer to inode | |
935 | * @fattr - updated attributes | |
936 | * | |
937 | * After an operation that has changed the inode metadata, mark the | |
938 | * attribute cache as being invalid, then try to update it. Fake up | |
939 | * weak cache consistency data, if none exist. | |
940 | * | |
941 | * This function is mainly designed to be used by the ->write_done() functions. | |
942 | */ | |
943 | int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) | |
944 | { | |
945 | if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 && | |
946 | (fattr->valid & NFS_ATTR_WCC_V4) == 0) { | |
947 | fattr->pre_change_attr = NFS_I(inode)->change_attr; | |
948 | fattr->valid |= NFS_ATTR_WCC_V4; | |
949 | } | |
950 | if ((fattr->valid & NFS_ATTR_FATTR) != 0 && | |
951 | (fattr->valid & NFS_ATTR_WCC) == 0) { | |
952 | memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime)); | |
953 | memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime)); | |
954 | fattr->pre_size = inode->i_size; | |
955 | fattr->valid |= NFS_ATTR_WCC; | |
956 | } | |
957 | return nfs_post_op_update_inode(inode, fattr); | |
958 | } | |
959 | ||
1da177e4 LT |
960 | /* |
961 | * Many nfs protocol calls return the new file attributes after | |
962 | * an operation. Here we update the inode to reflect the state | |
963 | * of the server's inode. | |
964 | * | |
965 | * This is a bit tricky because we have to make sure all dirty pages | |
966 | * have been sent off to the server before calling invalidate_inode_pages. | |
967 | * To make sure no other process adds more write requests while we try | |
968 | * our best to flush them, we make them sleep during the attribute refresh. | |
969 | * | |
970 | * A very similar scenario holds for the dir cache. | |
971 | */ | |
24aa1fe6 | 972 | static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) |
1da177e4 | 973 | { |
8b4bdcf8 | 974 | struct nfs_server *server; |
1da177e4 | 975 | struct nfs_inode *nfsi = NFS_I(inode); |
951a143b | 976 | loff_t cur_isize, new_isize; |
1da177e4 | 977 | unsigned int invalid = 0; |
3e7d950a | 978 | unsigned long now = jiffies; |
1da177e4 LT |
979 | |
980 | dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n", | |
981 | __FUNCTION__, inode->i_sb->s_id, inode->i_ino, | |
982 | atomic_read(&inode->i_count), fattr->valid); | |
983 | ||
325cfed9 CL |
984 | if (nfsi->fileid != fattr->fileid) |
985 | goto out_fileid; | |
1da177e4 LT |
986 | |
987 | /* | |
988 | * Make sure the inode's type hasn't changed. | |
989 | */ | |
33801147 | 990 | if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) |
1da177e4 LT |
991 | goto out_changed; |
992 | ||
8b4bdcf8 | 993 | server = NFS_SERVER(inode); |
a0356862 TM |
994 | /* Update the fsid? */ |
995 | if (S_ISDIR(inode->i_mode) | |
8b4bdcf8 TM |
996 | && !nfs_fsid_equal(&server->fsid, &fattr->fsid)) |
997 | server->fsid = fattr->fsid; | |
998 | ||
1da177e4 LT |
999 | /* |
1000 | * Update the read time so we don't revalidate too often. | |
1001 | */ | |
33801147 | 1002 | nfsi->read_cache_jiffies = fattr->time_start; |
3e7d950a TM |
1003 | nfsi->last_updated = now; |
1004 | ||
f2115dc9 TM |
1005 | nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ATIME |
1006 | | NFS_INO_REVAL_PAGECACHE); | |
1da177e4 | 1007 | |
a895b4a1 TM |
1008 | /* Do atomic weak cache consistency updates */ |
1009 | nfs_wcc_update_inode(inode, fattr); | |
1010 | ||
47aabaa7 TM |
1011 | /* More cache consistency checks */ |
1012 | if (!(fattr->valid & NFS_ATTR_FATTR_V4)) { | |
1013 | /* NFSv2/v3: Check if the mtime agrees */ | |
1014 | if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { | |
1015 | dprintk("NFS: mtime change on server for file %s/%ld\n", | |
1016 | inode->i_sb->s_id, inode->i_ino); | |
1017 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; | |
1018 | nfsi->cache_change_attribute = now; | |
1019 | } | |
1020 | /* If ctime has changed we should definitely clear access+acl caches */ | |
1021 | if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) { | |
1022 | invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; | |
1023 | nfsi->cache_change_attribute = now; | |
1024 | } | |
1025 | } else if (nfsi->change_attr != fattr->change_attr) { | |
1026 | dprintk("NFS: change_attr change on server for file %s/%ld\n", | |
1027 | inode->i_sb->s_id, inode->i_ino); | |
1028 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; | |
1029 | nfsi->cache_change_attribute = now; | |
1030 | } | |
1031 | ||
951a143b | 1032 | /* Check if our cached file size is stale */ |
1da177e4 LT |
1033 | new_isize = nfs_size_to_loff_t(fattr->size); |
1034 | cur_isize = i_size_read(inode); | |
951a143b | 1035 | if (new_isize != cur_isize) { |
b64e8a5e TM |
1036 | /* Do we perhaps have any outstanding writes, or has |
1037 | * the file grown beyond our last write? */ | |
1038 | if (nfsi->npages == 0 || new_isize > cur_isize) { | |
1da177e4 LT |
1039 | inode->i_size = new_isize; |
1040 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; | |
1041 | } | |
3e7d950a | 1042 | nfsi->cache_change_attribute = now; |
951a143b TM |
1043 | dprintk("NFS: isize change on server for file %s/%ld\n", |
1044 | inode->i_sb->s_id, inode->i_ino); | |
1da177e4 LT |
1045 | } |
1046 | ||
1da177e4 | 1047 | |
47aabaa7 TM |
1048 | memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); |
1049 | memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); | |
1da177e4 | 1050 | memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); |
47aabaa7 | 1051 | nfsi->change_attr = fattr->change_attr; |
1da177e4 LT |
1052 | |
1053 | if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) || | |
1054 | inode->i_uid != fattr->uid || | |
1055 | inode->i_gid != fattr->gid) | |
ada70d94 | 1056 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
1da177e4 LT |
1057 | |
1058 | inode->i_mode = fattr->mode; | |
1059 | inode->i_nlink = fattr->nlink; | |
1060 | inode->i_uid = fattr->uid; | |
1061 | inode->i_gid = fattr->gid; | |
1062 | ||
1063 | if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) { | |
1064 | /* | |
1065 | * report the blocks in 512byte units | |
1066 | */ | |
1067 | inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); | |
1da177e4 LT |
1068 | } else { |
1069 | inode->i_blocks = fattr->du.nfs2.blocks; | |
1da177e4 LT |
1070 | } |
1071 | ||
1072 | /* Update attrtimeo value if we're out of the unstable period */ | |
1073 | if (invalid & NFS_INO_INVALID_ATTR) { | |
91d5b470 | 1074 | nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); |
1da177e4 | 1075 | nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); |
3e7d950a | 1076 | nfsi->attrtimeo_timestamp = now; |
c7e15961 | 1077 | } else if (!time_in_range(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { |
1da177e4 LT |
1078 | if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode)) |
1079 | nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); | |
3e7d950a | 1080 | nfsi->attrtimeo_timestamp = now; |
1da177e4 | 1081 | } |
f2115dc9 | 1082 | invalid &= ~NFS_INO_INVALID_ATTR; |
1da177e4 LT |
1083 | /* Don't invalidate the data if we were to blame */ |
1084 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) | |
1085 | || S_ISLNK(inode->i_mode))) | |
1086 | invalid &= ~NFS_INO_INVALID_DATA; | |
412c77ce TM |
1087 | if (!nfs_have_delegation(inode, FMODE_READ) || |
1088 | (nfsi->cache_validity & NFS_INO_REVAL_FORCED)) | |
55296809 | 1089 | nfsi->cache_validity |= invalid; |
412c77ce | 1090 | nfsi->cache_validity &= ~NFS_INO_REVAL_FORCED; |
1da177e4 LT |
1091 | |
1092 | return 0; | |
1093 | out_changed: | |
1094 | /* | |
1095 | * Big trouble! The inode has become a different object. | |
1096 | */ | |
1da177e4 LT |
1097 | printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n", |
1098 | __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode); | |
b37b03b7 | 1099 | out_err: |
1da177e4 LT |
1100 | /* |
1101 | * No need to worry about unhashing the dentry, as the | |
1102 | * lookup validation will know that the inode is bad. | |
1103 | * (But we fall through to invalidate the caches.) | |
1104 | */ | |
1105 | nfs_invalidate_inode(inode); | |
1da177e4 | 1106 | return -ESTALE; |
325cfed9 CL |
1107 | |
1108 | out_fileid: | |
1109 | printk(KERN_ERR "NFS: server %s error: fileid changed\n" | |
1110 | "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", | |
54ceac45 | 1111 | NFS_SERVER(inode)->nfs_client->cl_hostname, inode->i_sb->s_id, |
325cfed9 CL |
1112 | (long long)nfsi->fileid, (long long)fattr->fileid); |
1113 | goto out_err; | |
1da177e4 LT |
1114 | } |
1115 | ||
55a97593 | 1116 | |
1da177e4 LT |
1117 | #ifdef CONFIG_NFS_V4 |
1118 | ||
1da177e4 LT |
1119 | /* |
1120 | * Clean out any remaining NFSv4 state that might be left over due | |
1121 | * to open() calls that passed nfs_atomic_lookup, but failed to call | |
1122 | * nfs_open(). | |
1123 | */ | |
f7b422b1 | 1124 | void nfs4_clear_inode(struct inode *inode) |
1da177e4 | 1125 | { |
1da177e4 | 1126 | /* If we are holding a delegation, return it! */ |
cae7a073 | 1127 | nfs_inode_return_delegation(inode); |
1da177e4 LT |
1128 | /* First call standard NFS clear_inode() code */ |
1129 | nfs_clear_inode(inode); | |
1da177e4 | 1130 | } |
1da177e4 LT |
1131 | #endif |
1132 | ||
f7b422b1 | 1133 | struct inode *nfs_alloc_inode(struct super_block *sb) |
1da177e4 LT |
1134 | { |
1135 | struct nfs_inode *nfsi; | |
e94b1766 | 1136 | nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
1137 | if (!nfsi) |
1138 | return NULL; | |
55296809 CL |
1139 | nfsi->flags = 0UL; |
1140 | nfsi->cache_validity = 0UL; | |
458818ed TM |
1141 | #ifdef CONFIG_NFS_V3_ACL |
1142 | nfsi->acl_access = ERR_PTR(-EAGAIN); | |
1143 | nfsi->acl_default = ERR_PTR(-EAGAIN); | |
1144 | #endif | |
e50a1c2e BF |
1145 | #ifdef CONFIG_NFS_V4 |
1146 | nfsi->nfs4_acl = NULL; | |
1147 | #endif /* CONFIG_NFS_V4 */ | |
1da177e4 LT |
1148 | return &nfsi->vfs_inode; |
1149 | } | |
1150 | ||
f7b422b1 | 1151 | void nfs_destroy_inode(struct inode *inode) |
1da177e4 LT |
1152 | { |
1153 | kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); | |
1154 | } | |
1155 | ||
d75d5414 AM |
1156 | static inline void nfs4_init_once(struct nfs_inode *nfsi) |
1157 | { | |
1158 | #ifdef CONFIG_NFS_V4 | |
1159 | INIT_LIST_HEAD(&nfsi->open_states); | |
1160 | nfsi->delegation = NULL; | |
1161 | nfsi->delegation_state = 0; | |
1162 | init_rwsem(&nfsi->rwsem); | |
1163 | #endif | |
1164 | } | |
f7b422b1 | 1165 | |
e18b890b | 1166 | static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags) |
1da177e4 LT |
1167 | { |
1168 | struct nfs_inode *nfsi = (struct nfs_inode *) foo; | |
1169 | ||
a35afb83 | 1170 | inode_init_once(&nfsi->vfs_inode); |
a35afb83 CL |
1171 | INIT_LIST_HEAD(&nfsi->open_files); |
1172 | INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); | |
1173 | INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); | |
1174 | INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC); | |
1175 | atomic_set(&nfsi->data_updates, 0); | |
a35afb83 CL |
1176 | nfsi->ncommit = 0; |
1177 | nfsi->npages = 0; | |
1178 | nfs4_init_once(nfsi); | |
1da177e4 | 1179 | } |
20c2df83 | 1180 | |
f7b422b1 | 1181 | static int __init nfs_init_inodecache(void) |
1da177e4 LT |
1182 | { |
1183 | nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", | |
1184 | sizeof(struct nfs_inode), | |
fffb60f9 PJ |
1185 | 0, (SLAB_RECLAIM_ACCOUNT| |
1186 | SLAB_MEM_SPREAD), | |
20c2df83 | 1187 | init_once); |
1da177e4 LT |
1188 | if (nfs_inode_cachep == NULL) |
1189 | return -ENOMEM; | |
1190 | ||
1191 | return 0; | |
1192 | } | |
1193 | ||
266bee88 | 1194 | static void nfs_destroy_inodecache(void) |
1da177e4 | 1195 | { |
1a1d92c1 | 1196 | kmem_cache_destroy(nfs_inode_cachep); |
1da177e4 LT |
1197 | } |
1198 | ||
1199 | /* | |
1200 | * Initialize NFS | |
1201 | */ | |
1202 | static int __init init_nfs_fs(void) | |
1203 | { | |
1204 | int err; | |
1205 | ||
6aaca566 DH |
1206 | err = nfs_fs_proc_init(); |
1207 | if (err) | |
1208 | goto out5; | |
1209 | ||
1da177e4 LT |
1210 | err = nfs_init_nfspagecache(); |
1211 | if (err) | |
1212 | goto out4; | |
1213 | ||
1214 | err = nfs_init_inodecache(); | |
1215 | if (err) | |
1216 | goto out3; | |
1217 | ||
1218 | err = nfs_init_readpagecache(); | |
1219 | if (err) | |
1220 | goto out2; | |
1221 | ||
1222 | err = nfs_init_writepagecache(); | |
1223 | if (err) | |
1224 | goto out1; | |
1225 | ||
1da177e4 LT |
1226 | err = nfs_init_directcache(); |
1227 | if (err) | |
1228 | goto out0; | |
1da177e4 LT |
1229 | |
1230 | #ifdef CONFIG_PROC_FS | |
1231 | rpc_proc_register(&nfs_rpcstat); | |
1232 | #endif | |
f7b422b1 | 1233 | if ((err = register_nfs_fs()) != 0) |
1da177e4 LT |
1234 | goto out; |
1235 | return 0; | |
1236 | out: | |
1237 | #ifdef CONFIG_PROC_FS | |
1238 | rpc_proc_unregister("nfs"); | |
1239 | #endif | |
1da177e4 | 1240 | nfs_destroy_directcache(); |
6b59a754 | 1241 | out0: |
6b59a754 | 1242 | nfs_destroy_writepagecache(); |
1da177e4 LT |
1243 | out1: |
1244 | nfs_destroy_readpagecache(); | |
1245 | out2: | |
1246 | nfs_destroy_inodecache(); | |
1247 | out3: | |
1248 | nfs_destroy_nfspagecache(); | |
1249 | out4: | |
6aaca566 DH |
1250 | nfs_fs_proc_exit(); |
1251 | out5: | |
1da177e4 LT |
1252 | return err; |
1253 | } | |
1254 | ||
1255 | static void __exit exit_nfs_fs(void) | |
1256 | { | |
1da177e4 | 1257 | nfs_destroy_directcache(); |
1da177e4 LT |
1258 | nfs_destroy_writepagecache(); |
1259 | nfs_destroy_readpagecache(); | |
1260 | nfs_destroy_inodecache(); | |
1261 | nfs_destroy_nfspagecache(); | |
1262 | #ifdef CONFIG_PROC_FS | |
1263 | rpc_proc_unregister("nfs"); | |
1264 | #endif | |
f7b422b1 | 1265 | unregister_nfs_fs(); |
6aaca566 | 1266 | nfs_fs_proc_exit(); |
1da177e4 LT |
1267 | } |
1268 | ||
1269 | /* Not quite true; I just maintain it */ | |
1270 | MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); | |
1271 | MODULE_LICENSE("GPL"); | |
1272 | ||
1273 | module_init(init_nfs_fs) | |
1274 | module_exit(exit_nfs_fs) |