Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (c) 2002 Red Hat, Inc. All rights reserved. | |
3 | * | |
4 | * This software may be freely redistributed under the terms of the | |
5 | * GNU General Public License. | |
6 | * | |
7 | * You should have received a copy of the GNU General Public License | |
8 | * along with this program; if not, write to the Free Software | |
9 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
10 | * | |
44d1b980 | 11 | * Authors: David Woodhouse <dwmw2@infradead.org> |
1da177e4 LT |
12 | * David Howells <dhowells@redhat.com> |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/init.h> | |
1da177e4 LT |
19 | #include <linux/fs.h> |
20 | #include <linux/pagemap.h> | |
e8edc6e0 | 21 | #include <linux/sched.h> |
bec5eb61 | 22 | #include <linux/mount.h> |
23 | #include <linux/namei.h> | |
1da177e4 LT |
24 | #include "internal.h" |
25 | ||
26 | struct afs_iget_data { | |
27 | struct afs_fid fid; | |
28 | struct afs_volume *volume; /* volume on which resides */ | |
29 | }; | |
30 | ||
1da177e4 LT |
31 | /* |
32 | * map the AFS file status to the inode member variables | |
33 | */ | |
00d3b7a4 | 34 | static int afs_inode_map_status(struct afs_vnode *vnode, struct key *key) |
1da177e4 LT |
35 | { |
36 | struct inode *inode = AFS_VNODE_TO_I(vnode); | |
37 | ||
260a9803 | 38 | _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu", |
1da177e4 LT |
39 | vnode->status.type, |
40 | vnode->status.nlink, | |
ba3e0e1a | 41 | (unsigned long long) vnode->status.size, |
08e0e7c8 | 42 | vnode->status.data_version, |
1da177e4 LT |
43 | vnode->status.mode); |
44 | ||
45 | switch (vnode->status.type) { | |
46 | case AFS_FTYPE_FILE: | |
47 | inode->i_mode = S_IFREG | vnode->status.mode; | |
48 | inode->i_op = &afs_file_inode_operations; | |
00d3b7a4 | 49 | inode->i_fop = &afs_file_operations; |
1da177e4 LT |
50 | break; |
51 | case AFS_FTYPE_DIR: | |
52 | inode->i_mode = S_IFDIR | vnode->status.mode; | |
53 | inode->i_op = &afs_dir_inode_operations; | |
54 | inode->i_fop = &afs_dir_file_operations; | |
55 | break; | |
56 | case AFS_FTYPE_SYMLINK: | |
57 | inode->i_mode = S_IFLNK | vnode->status.mode; | |
58 | inode->i_op = &page_symlink_inode_operations; | |
59 | break; | |
60 | default: | |
61 | printk("kAFS: AFS vnode with undefined type\n"); | |
62 | return -EBADMSG; | |
63 | } | |
64 | ||
9b3f26c9 DH |
65 | #ifdef CONFIG_AFS_FSCACHE |
66 | if (vnode->status.size != inode->i_size) | |
67 | fscache_attr_changed(vnode->cache); | |
68 | #endif | |
69 | ||
1da177e4 LT |
70 | inode->i_nlink = vnode->status.nlink; |
71 | inode->i_uid = vnode->status.owner; | |
72 | inode->i_gid = 0; | |
73 | inode->i_size = vnode->status.size; | |
74 | inode->i_ctime.tv_sec = vnode->status.mtime_server; | |
75 | inode->i_ctime.tv_nsec = 0; | |
76 | inode->i_atime = inode->i_mtime = inode->i_ctime; | |
1da177e4 LT |
77 | inode->i_blocks = 0; |
78 | inode->i_version = vnode->fid.unique; | |
79 | inode->i_mapping->a_ops = &afs_fs_aops; | |
80 | ||
81 | /* check to see whether a symbolic link is really a mountpoint */ | |
82 | if (vnode->status.type == AFS_FTYPE_SYMLINK) { | |
00d3b7a4 | 83 | afs_mntpt_check_symlink(vnode, key); |
1da177e4 | 84 | |
08e0e7c8 | 85 | if (test_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags)) { |
1da177e4 LT |
86 | inode->i_mode = S_IFDIR | vnode->status.mode; |
87 | inode->i_op = &afs_mntpt_inode_operations; | |
88 | inode->i_fop = &afs_mntpt_file_operations; | |
89 | } | |
90 | } | |
91 | ||
92 | return 0; | |
ec26815a | 93 | } |
1da177e4 | 94 | |
1da177e4 LT |
95 | /* |
96 | * iget5() comparator | |
97 | */ | |
98 | static int afs_iget5_test(struct inode *inode, void *opaque) | |
99 | { | |
100 | struct afs_iget_data *data = opaque; | |
101 | ||
102 | return inode->i_ino == data->fid.vnode && | |
103 | inode->i_version == data->fid.unique; | |
ec26815a | 104 | } |
1da177e4 | 105 | |
bec5eb61 | 106 | /* |
107 | * iget5() comparator for inode created by autocell operations | |
108 | * | |
109 | * These pseudo inodes don't match anything. | |
110 | */ | |
111 | static int afs_iget5_autocell_test(struct inode *inode, void *opaque) | |
112 | { | |
113 | return 0; | |
114 | } | |
115 | ||
1da177e4 LT |
116 | /* |
117 | * iget5() inode initialiser | |
118 | */ | |
119 | static int afs_iget5_set(struct inode *inode, void *opaque) | |
120 | { | |
121 | struct afs_iget_data *data = opaque; | |
122 | struct afs_vnode *vnode = AFS_FS_I(inode); | |
123 | ||
124 | inode->i_ino = data->fid.vnode; | |
125 | inode->i_version = data->fid.unique; | |
126 | vnode->fid = data->fid; | |
127 | vnode->volume = data->volume; | |
128 | ||
129 | return 0; | |
ec26815a | 130 | } |
1da177e4 | 131 | |
bec5eb61 | 132 | /* |
133 | * inode retrieval for autocell | |
134 | */ | |
135 | struct inode *afs_iget_autocell(struct inode *dir, const char *dev_name, | |
136 | int namesz, struct key *key) | |
137 | { | |
138 | struct afs_iget_data data; | |
139 | struct afs_super_info *as; | |
140 | struct afs_vnode *vnode; | |
141 | struct super_block *sb; | |
142 | struct inode *inode; | |
143 | static atomic_t afs_autocell_ino; | |
144 | ||
145 | _enter("{%x:%u},%*.*s,", | |
146 | AFS_FS_I(dir)->fid.vid, AFS_FS_I(dir)->fid.vnode, | |
147 | namesz, namesz, dev_name ?: ""); | |
148 | ||
149 | sb = dir->i_sb; | |
150 | as = sb->s_fs_info; | |
151 | data.volume = as->volume; | |
152 | data.fid.vid = as->volume->vid; | |
153 | data.fid.unique = 0; | |
154 | data.fid.vnode = 0; | |
155 | ||
156 | inode = iget5_locked(sb, atomic_inc_return(&afs_autocell_ino), | |
157 | afs_iget5_autocell_test, afs_iget5_set, | |
158 | &data); | |
159 | if (!inode) { | |
160 | _leave(" = -ENOMEM"); | |
161 | return ERR_PTR(-ENOMEM); | |
162 | } | |
163 | ||
164 | _debug("GOT INODE %p { ino=%lu, vl=%x, vn=%x, u=%x }", | |
165 | inode, inode->i_ino, data.fid.vid, data.fid.vnode, | |
166 | data.fid.unique); | |
167 | ||
168 | vnode = AFS_FS_I(inode); | |
169 | ||
170 | /* there shouldn't be an existing inode */ | |
171 | BUG_ON(!(inode->i_state & I_NEW)); | |
172 | ||
173 | inode->i_size = 0; | |
174 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
175 | inode->i_op = &afs_autocell_inode_operations; | |
176 | inode->i_nlink = 2; | |
177 | inode->i_uid = 0; | |
178 | inode->i_gid = 0; | |
179 | inode->i_ctime.tv_sec = get_seconds(); | |
180 | inode->i_ctime.tv_nsec = 0; | |
181 | inode->i_atime = inode->i_mtime = inode->i_ctime; | |
182 | inode->i_blocks = 0; | |
183 | inode->i_version = 0; | |
184 | inode->i_generation = 0; | |
185 | ||
186 | set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags); | |
d18610b0 DH |
187 | set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); |
188 | inode->i_flags |= S_AUTOMOUNT | S_NOATIME; | |
bec5eb61 | 189 | unlock_new_inode(inode); |
190 | _leave(" = %p", inode); | |
191 | return inode; | |
192 | } | |
193 | ||
1da177e4 LT |
194 | /* |
195 | * inode retrieval | |
196 | */ | |
260a9803 DH |
197 | struct inode *afs_iget(struct super_block *sb, struct key *key, |
198 | struct afs_fid *fid, struct afs_file_status *status, | |
199 | struct afs_callback *cb) | |
1da177e4 LT |
200 | { |
201 | struct afs_iget_data data = { .fid = *fid }; | |
202 | struct afs_super_info *as; | |
203 | struct afs_vnode *vnode; | |
204 | struct inode *inode; | |
205 | int ret; | |
206 | ||
416351f2 | 207 | _enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique); |
1da177e4 LT |
208 | |
209 | as = sb->s_fs_info; | |
210 | data.volume = as->volume; | |
211 | ||
212 | inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set, | |
213 | &data); | |
214 | if (!inode) { | |
215 | _leave(" = -ENOMEM"); | |
08e0e7c8 | 216 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
217 | } |
218 | ||
08e0e7c8 DH |
219 | _debug("GOT INODE %p { vl=%x vn=%x, u=%x }", |
220 | inode, fid->vid, fid->vnode, fid->unique); | |
221 | ||
1da177e4 LT |
222 | vnode = AFS_FS_I(inode); |
223 | ||
224 | /* deal with an existing inode */ | |
225 | if (!(inode->i_state & I_NEW)) { | |
08e0e7c8 DH |
226 | _leave(" = %p", inode); |
227 | return inode; | |
1da177e4 LT |
228 | } |
229 | ||
260a9803 DH |
230 | if (!status) { |
231 | /* it's a remotely extant inode */ | |
232 | set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); | |
233 | ret = afs_vnode_fetch_status(vnode, NULL, key); | |
234 | if (ret < 0) | |
235 | goto bad_inode; | |
236 | } else { | |
237 | /* it's an inode we just created */ | |
238 | memcpy(&vnode->status, status, sizeof(vnode->status)); | |
239 | ||
240 | if (!cb) { | |
241 | /* it's a symlink we just created (the fileserver | |
242 | * didn't give us a callback) */ | |
243 | vnode->cb_version = 0; | |
244 | vnode->cb_expiry = 0; | |
245 | vnode->cb_type = 0; | |
246 | vnode->cb_expires = get_seconds(); | |
247 | } else { | |
248 | vnode->cb_version = cb->version; | |
249 | vnode->cb_expiry = cb->expiry; | |
250 | vnode->cb_type = cb->type; | |
251 | vnode->cb_expires = vnode->cb_expiry + get_seconds(); | |
252 | } | |
253 | } | |
254 | ||
9b3f26c9 DH |
255 | /* set up caching before mapping the status, as map-status reads the |
256 | * first page of symlinks to see if they're really mountpoints */ | |
257 | inode->i_size = vnode->status.size; | |
258 | #ifdef CONFIG_AFS_FSCACHE | |
259 | vnode->cache = fscache_acquire_cookie(vnode->volume->cache, | |
260 | &afs_vnode_cache_index_def, | |
261 | vnode); | |
262 | #endif | |
263 | ||
00d3b7a4 | 264 | ret = afs_inode_map_status(vnode, key); |
08e0e7c8 | 265 | if (ret < 0) |
1da177e4 LT |
266 | goto bad_inode; |
267 | ||
268 | /* success */ | |
260a9803 | 269 | clear_bit(AFS_VNODE_UNSET, &vnode->flags); |
08e0e7c8 | 270 | inode->i_flags |= S_NOATIME; |
1da177e4 | 271 | unlock_new_inode(inode); |
08e0e7c8 DH |
272 | _leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type); |
273 | return inode; | |
1da177e4 LT |
274 | |
275 | /* failure */ | |
ec26815a | 276 | bad_inode: |
9b3f26c9 DH |
277 | #ifdef CONFIG_AFS_FSCACHE |
278 | fscache_relinquish_cookie(vnode->cache, 0); | |
279 | vnode->cache = NULL; | |
280 | #endif | |
aa7fa240 | 281 | iget_failed(inode); |
1da177e4 | 282 | _leave(" = %d [bad]", ret); |
08e0e7c8 | 283 | return ERR_PTR(ret); |
ec26815a | 284 | } |
1da177e4 | 285 | |
416351f2 DH |
286 | /* |
287 | * mark the data attached to an inode as obsolete due to a write on the server | |
288 | * - might also want to ditch all the outstanding writes and dirty pages | |
289 | */ | |
290 | void afs_zap_data(struct afs_vnode *vnode) | |
291 | { | |
0f300ca9 | 292 | _enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode); |
416351f2 DH |
293 | |
294 | /* nuke all the non-dirty pages that aren't locked, mapped or being | |
0f300ca9 DH |
295 | * written back in a regular file and completely discard the pages in a |
296 | * directory or symlink */ | |
297 | if (S_ISREG(vnode->vfs_inode.i_mode)) | |
298 | invalidate_remote_inode(&vnode->vfs_inode); | |
299 | else | |
300 | invalidate_inode_pages2(vnode->vfs_inode.i_mapping); | |
416351f2 DH |
301 | } |
302 | ||
260a9803 DH |
303 | /* |
304 | * validate a vnode/inode | |
305 | * - there are several things we need to check | |
306 | * - parent dir data changes (rm, rmdir, rename, mkdir, create, link, | |
307 | * symlink) | |
308 | * - parent dir metadata changed (security changes) | |
309 | * - dentry data changed (write, truncate) | |
310 | * - dentry metadata changed (security changes) | |
311 | */ | |
312 | int afs_validate(struct afs_vnode *vnode, struct key *key) | |
313 | { | |
314 | int ret; | |
315 | ||
316 | _enter("{v={%x:%u} fl=%lx},%x", | |
317 | vnode->fid.vid, vnode->fid.vnode, vnode->flags, | |
318 | key_serial(key)); | |
319 | ||
320 | if (vnode->cb_promised && | |
321 | !test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) && | |
322 | !test_bit(AFS_VNODE_MODIFIED, &vnode->flags) && | |
323 | !test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) { | |
324 | if (vnode->cb_expires < get_seconds() + 10) { | |
325 | _debug("callback expired"); | |
326 | set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); | |
327 | } else { | |
328 | goto valid; | |
329 | } | |
330 | } | |
331 | ||
332 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
333 | goto valid; | |
334 | ||
335 | mutex_lock(&vnode->validate_lock); | |
336 | ||
337 | /* if the promise has expired, we need to check the server again to get | |
338 | * a new promise - note that if the (parent) directory's metadata was | |
339 | * changed then the security may be different and we may no longer have | |
340 | * access */ | |
341 | if (!vnode->cb_promised || | |
342 | test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) { | |
343 | _debug("not promised"); | |
344 | ret = afs_vnode_fetch_status(vnode, NULL, key); | |
345 | if (ret < 0) | |
346 | goto error_unlock; | |
347 | _debug("new promise [fl=%lx]", vnode->flags); | |
348 | } | |
349 | ||
350 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { | |
351 | _debug("file already deleted"); | |
352 | ret = -ESTALE; | |
353 | goto error_unlock; | |
354 | } | |
355 | ||
356 | /* if the vnode's data version number changed then its contents are | |
357 | * different */ | |
416351f2 DH |
358 | if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) |
359 | afs_zap_data(vnode); | |
260a9803 DH |
360 | |
361 | clear_bit(AFS_VNODE_MODIFIED, &vnode->flags); | |
362 | mutex_unlock(&vnode->validate_lock); | |
363 | valid: | |
364 | _leave(" = 0"); | |
365 | return 0; | |
366 | ||
367 | error_unlock: | |
368 | mutex_unlock(&vnode->validate_lock); | |
369 | _leave(" = %d", ret); | |
370 | return ret; | |
371 | } | |
372 | ||
1da177e4 LT |
373 | /* |
374 | * read the attributes of an inode | |
375 | */ | |
416351f2 | 376 | int afs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1da177e4 LT |
377 | struct kstat *stat) |
378 | { | |
1da177e4 | 379 | struct inode *inode; |
1da177e4 LT |
380 | |
381 | inode = dentry->d_inode; | |
382 | ||
7a224228 JNC |
383 | _enter("{ ino=%lu v=%llu }", inode->i_ino, |
384 | (unsigned long long)inode->i_version); | |
1da177e4 | 385 | |
1da177e4 | 386 | generic_fillattr(inode, stat); |
1da177e4 | 387 | return 0; |
ec26815a | 388 | } |
1da177e4 | 389 | |
bec5eb61 | 390 | /* |
391 | * discard an AFS inode | |
392 | */ | |
393 | int afs_drop_inode(struct inode *inode) | |
394 | { | |
395 | _enter(""); | |
396 | ||
397 | if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags)) | |
398 | return generic_delete_inode(inode); | |
399 | else | |
400 | return generic_drop_inode(inode); | |
401 | } | |
402 | ||
1da177e4 LT |
403 | /* |
404 | * clear an AFS inode | |
405 | */ | |
b57922d9 | 406 | void afs_evict_inode(struct inode *inode) |
1da177e4 | 407 | { |
00d3b7a4 | 408 | struct afs_permits *permits; |
1da177e4 LT |
409 | struct afs_vnode *vnode; |
410 | ||
411 | vnode = AFS_FS_I(inode); | |
412 | ||
416351f2 | 413 | _enter("{%x:%u.%d} v=%u x=%u t=%u }", |
260a9803 | 414 | vnode->fid.vid, |
1da177e4 | 415 | vnode->fid.vnode, |
260a9803 | 416 | vnode->fid.unique, |
1da177e4 LT |
417 | vnode->cb_version, |
418 | vnode->cb_expiry, | |
08e0e7c8 | 419 | vnode->cb_type); |
1da177e4 | 420 | |
08e0e7c8 DH |
421 | _debug("CLEAR INODE %p", inode); |
422 | ||
423 | ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); | |
424 | ||
b57922d9 AV |
425 | truncate_inode_pages(&inode->i_data, 0); |
426 | end_writeback(inode); | |
427 | ||
08e0e7c8 DH |
428 | afs_give_up_callback(vnode); |
429 | ||
430 | if (vnode->server) { | |
431 | spin_lock(&vnode->server->fs_lock); | |
432 | rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes); | |
433 | spin_unlock(&vnode->server->fs_lock); | |
434 | afs_put_server(vnode->server); | |
435 | vnode->server = NULL; | |
436 | } | |
1da177e4 | 437 | |
31143d5d | 438 | ASSERT(list_empty(&vnode->writebacks)); |
08e0e7c8 | 439 | ASSERT(!vnode->cb_promised); |
1da177e4 | 440 | |
9b3f26c9 DH |
441 | #ifdef CONFIG_AFS_FSCACHE |
442 | fscache_relinquish_cookie(vnode->cache, 0); | |
1da177e4 LT |
443 | vnode->cache = NULL; |
444 | #endif | |
445 | ||
00d3b7a4 DH |
446 | mutex_lock(&vnode->permits_lock); |
447 | permits = vnode->permits; | |
448 | rcu_assign_pointer(vnode->permits, NULL); | |
449 | mutex_unlock(&vnode->permits_lock); | |
450 | if (permits) | |
451 | call_rcu(&permits->rcu, afs_zap_permits); | |
452 | ||
1da177e4 | 453 | _leave(""); |
ec26815a | 454 | } |
31143d5d DH |
455 | |
456 | /* | |
457 | * set the attributes of an inode | |
458 | */ | |
459 | int afs_setattr(struct dentry *dentry, struct iattr *attr) | |
460 | { | |
461 | struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode); | |
462 | struct key *key; | |
463 | int ret; | |
464 | ||
465 | _enter("{%x:%u},{n=%s},%x", | |
466 | vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name, | |
467 | attr->ia_valid); | |
468 | ||
469 | if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | | |
470 | ATTR_MTIME))) { | |
471 | _leave(" = 0 [unsupported]"); | |
472 | return 0; | |
473 | } | |
474 | ||
475 | /* flush any dirty data outstanding on a regular file */ | |
476 | if (S_ISREG(vnode->vfs_inode.i_mode)) { | |
477 | filemap_write_and_wait(vnode->vfs_inode.i_mapping); | |
478 | afs_writeback_all(vnode); | |
479 | } | |
480 | ||
481 | if (attr->ia_valid & ATTR_FILE) { | |
482 | key = attr->ia_file->private_data; | |
483 | } else { | |
484 | key = afs_request_key(vnode->volume->cell); | |
485 | if (IS_ERR(key)) { | |
486 | ret = PTR_ERR(key); | |
487 | goto error; | |
488 | } | |
489 | } | |
490 | ||
491 | ret = afs_vnode_setattr(vnode, key, attr); | |
492 | if (!(attr->ia_valid & ATTR_FILE)) | |
493 | key_put(key); | |
494 | ||
495 | error: | |
496 | _leave(" = %d", ret); | |
497 | return ret; | |
498 | } |