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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 | ||
d3e3b7ea DH |
31 | static const struct inode_operations afs_symlink_inode_operations = { |
32 | .get_link = page_get_link, | |
33 | .listxattr = afs_listxattr, | |
34 | }; | |
35 | ||
1da177e4 LT |
36 | /* |
37 | * map the AFS file status to the inode member variables | |
38 | */ | |
00d3b7a4 | 39 | static int afs_inode_map_status(struct afs_vnode *vnode, struct key *key) |
1da177e4 LT |
40 | { |
41 | struct inode *inode = AFS_VNODE_TO_I(vnode); | |
42 | ||
260a9803 | 43 | _debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu", |
1da177e4 LT |
44 | vnode->status.type, |
45 | vnode->status.nlink, | |
ba3e0e1a | 46 | (unsigned long long) vnode->status.size, |
08e0e7c8 | 47 | vnode->status.data_version, |
1da177e4 LT |
48 | vnode->status.mode); |
49 | ||
50 | switch (vnode->status.type) { | |
51 | case AFS_FTYPE_FILE: | |
52 | inode->i_mode = S_IFREG | vnode->status.mode; | |
53 | inode->i_op = &afs_file_inode_operations; | |
00d3b7a4 | 54 | inode->i_fop = &afs_file_operations; |
1da177e4 LT |
55 | break; |
56 | case AFS_FTYPE_DIR: | |
57 | inode->i_mode = S_IFDIR | vnode->status.mode; | |
58 | inode->i_op = &afs_dir_inode_operations; | |
59 | inode->i_fop = &afs_dir_file_operations; | |
60 | break; | |
61 | case AFS_FTYPE_SYMLINK: | |
944c74f4 DH |
62 | /* Symlinks with a mode of 0644 are actually mountpoints. */ |
63 | if ((vnode->status.mode & 0777) == 0644) { | |
64 | inode->i_flags |= S_AUTOMOUNT; | |
65 | ||
66 | spin_lock(&vnode->lock); | |
67 | set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); | |
68 | spin_unlock(&vnode->lock); | |
69 | ||
70 | inode->i_mode = S_IFDIR | 0555; | |
71 | inode->i_op = &afs_mntpt_inode_operations; | |
72 | inode->i_fop = &afs_mntpt_file_operations; | |
73 | } else { | |
74 | inode->i_mode = S_IFLNK | vnode->status.mode; | |
d3e3b7ea | 75 | inode->i_op = &afs_symlink_inode_operations; |
944c74f4 | 76 | } |
21fc61c7 | 77 | inode_nohighmem(inode); |
1da177e4 LT |
78 | break; |
79 | default: | |
80 | printk("kAFS: AFS vnode with undefined type\n"); | |
81 | return -EBADMSG; | |
82 | } | |
83 | ||
9b3f26c9 DH |
84 | #ifdef CONFIG_AFS_FSCACHE |
85 | if (vnode->status.size != inode->i_size) | |
86 | fscache_attr_changed(vnode->cache); | |
87 | #endif | |
88 | ||
bfe86848 | 89 | set_nlink(inode, vnode->status.nlink); |
1da177e4 | 90 | inode->i_uid = vnode->status.owner; |
6186f078 | 91 | inode->i_gid = vnode->status.group; |
1da177e4 | 92 | inode->i_size = vnode->status.size; |
ab94f5d0 | 93 | inode->i_ctime.tv_sec = vnode->status.mtime_client; |
1da177e4 LT |
94 | inode->i_ctime.tv_nsec = 0; |
95 | inode->i_atime = inode->i_mtime = inode->i_ctime; | |
1da177e4 | 96 | inode->i_blocks = 0; |
d6e43f75 DH |
97 | inode->i_generation = vnode->fid.unique; |
98 | inode->i_version = vnode->status.data_version; | |
1da177e4 | 99 | inode->i_mapping->a_ops = &afs_fs_aops; |
1da177e4 | 100 | return 0; |
ec26815a | 101 | } |
1da177e4 | 102 | |
1da177e4 LT |
103 | /* |
104 | * iget5() comparator | |
105 | */ | |
106 | static int afs_iget5_test(struct inode *inode, void *opaque) | |
107 | { | |
108 | struct afs_iget_data *data = opaque; | |
109 | ||
110 | return inode->i_ino == data->fid.vnode && | |
d6e43f75 | 111 | inode->i_generation == data->fid.unique; |
ec26815a | 112 | } |
1da177e4 | 113 | |
bec5eb61 | 114 | /* |
115 | * iget5() comparator for inode created by autocell operations | |
116 | * | |
117 | * These pseudo inodes don't match anything. | |
118 | */ | |
119 | static int afs_iget5_autocell_test(struct inode *inode, void *opaque) | |
120 | { | |
121 | return 0; | |
122 | } | |
123 | ||
1da177e4 LT |
124 | /* |
125 | * iget5() inode initialiser | |
126 | */ | |
127 | static int afs_iget5_set(struct inode *inode, void *opaque) | |
128 | { | |
129 | struct afs_iget_data *data = opaque; | |
130 | struct afs_vnode *vnode = AFS_FS_I(inode); | |
131 | ||
132 | inode->i_ino = data->fid.vnode; | |
d6e43f75 | 133 | inode->i_generation = data->fid.unique; |
1da177e4 LT |
134 | vnode->fid = data->fid; |
135 | vnode->volume = data->volume; | |
136 | ||
137 | return 0; | |
ec26815a | 138 | } |
1da177e4 | 139 | |
bec5eb61 | 140 | /* |
141 | * inode retrieval for autocell | |
142 | */ | |
143 | struct inode *afs_iget_autocell(struct inode *dir, const char *dev_name, | |
144 | int namesz, struct key *key) | |
145 | { | |
146 | struct afs_iget_data data; | |
147 | struct afs_super_info *as; | |
148 | struct afs_vnode *vnode; | |
149 | struct super_block *sb; | |
150 | struct inode *inode; | |
151 | static atomic_t afs_autocell_ino; | |
152 | ||
153 | _enter("{%x:%u},%*.*s,", | |
154 | AFS_FS_I(dir)->fid.vid, AFS_FS_I(dir)->fid.vnode, | |
155 | namesz, namesz, dev_name ?: ""); | |
156 | ||
157 | sb = dir->i_sb; | |
158 | as = sb->s_fs_info; | |
159 | data.volume = as->volume; | |
160 | data.fid.vid = as->volume->vid; | |
161 | data.fid.unique = 0; | |
162 | data.fid.vnode = 0; | |
163 | ||
164 | inode = iget5_locked(sb, atomic_inc_return(&afs_autocell_ino), | |
165 | afs_iget5_autocell_test, afs_iget5_set, | |
166 | &data); | |
167 | if (!inode) { | |
168 | _leave(" = -ENOMEM"); | |
169 | return ERR_PTR(-ENOMEM); | |
170 | } | |
171 | ||
172 | _debug("GOT INODE %p { ino=%lu, vl=%x, vn=%x, u=%x }", | |
173 | inode, inode->i_ino, data.fid.vid, data.fid.vnode, | |
174 | data.fid.unique); | |
175 | ||
176 | vnode = AFS_FS_I(inode); | |
177 | ||
178 | /* there shouldn't be an existing inode */ | |
179 | BUG_ON(!(inode->i_state & I_NEW)); | |
180 | ||
181 | inode->i_size = 0; | |
182 | inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
183 | inode->i_op = &afs_autocell_inode_operations; | |
bfe86848 | 184 | set_nlink(inode, 2); |
a0a5386a EB |
185 | inode->i_uid = GLOBAL_ROOT_UID; |
186 | inode->i_gid = GLOBAL_ROOT_GID; | |
bec5eb61 | 187 | inode->i_ctime.tv_sec = get_seconds(); |
188 | inode->i_ctime.tv_nsec = 0; | |
189 | inode->i_atime = inode->i_mtime = inode->i_ctime; | |
190 | inode->i_blocks = 0; | |
191 | inode->i_version = 0; | |
192 | inode->i_generation = 0; | |
193 | ||
194 | set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags); | |
d18610b0 DH |
195 | set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); |
196 | inode->i_flags |= S_AUTOMOUNT | S_NOATIME; | |
bec5eb61 | 197 | unlock_new_inode(inode); |
198 | _leave(" = %p", inode); | |
199 | return inode; | |
200 | } | |
201 | ||
1da177e4 LT |
202 | /* |
203 | * inode retrieval | |
204 | */ | |
260a9803 DH |
205 | struct inode *afs_iget(struct super_block *sb, struct key *key, |
206 | struct afs_fid *fid, struct afs_file_status *status, | |
207 | struct afs_callback *cb) | |
1da177e4 LT |
208 | { |
209 | struct afs_iget_data data = { .fid = *fid }; | |
210 | struct afs_super_info *as; | |
211 | struct afs_vnode *vnode; | |
212 | struct inode *inode; | |
213 | int ret; | |
214 | ||
416351f2 | 215 | _enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique); |
1da177e4 LT |
216 | |
217 | as = sb->s_fs_info; | |
218 | data.volume = as->volume; | |
219 | ||
220 | inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set, | |
221 | &data); | |
222 | if (!inode) { | |
223 | _leave(" = -ENOMEM"); | |
08e0e7c8 | 224 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
225 | } |
226 | ||
08e0e7c8 DH |
227 | _debug("GOT INODE %p { vl=%x vn=%x, u=%x }", |
228 | inode, fid->vid, fid->vnode, fid->unique); | |
229 | ||
1da177e4 LT |
230 | vnode = AFS_FS_I(inode); |
231 | ||
232 | /* deal with an existing inode */ | |
233 | if (!(inode->i_state & I_NEW)) { | |
08e0e7c8 DH |
234 | _leave(" = %p", inode); |
235 | return inode; | |
1da177e4 LT |
236 | } |
237 | ||
260a9803 DH |
238 | if (!status) { |
239 | /* it's a remotely extant inode */ | |
240 | set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); | |
241 | ret = afs_vnode_fetch_status(vnode, NULL, key); | |
242 | if (ret < 0) | |
243 | goto bad_inode; | |
244 | } else { | |
245 | /* it's an inode we just created */ | |
246 | memcpy(&vnode->status, status, sizeof(vnode->status)); | |
247 | ||
248 | if (!cb) { | |
249 | /* it's a symlink we just created (the fileserver | |
250 | * didn't give us a callback) */ | |
251 | vnode->cb_version = 0; | |
252 | vnode->cb_expiry = 0; | |
253 | vnode->cb_type = 0; | |
56e71431 | 254 | vnode->cb_expires = ktime_get_real_seconds(); |
260a9803 DH |
255 | } else { |
256 | vnode->cb_version = cb->version; | |
257 | vnode->cb_expiry = cb->expiry; | |
258 | vnode->cb_type = cb->type; | |
56e71431 TR |
259 | vnode->cb_expires = vnode->cb_expiry + |
260 | ktime_get_real_seconds(); | |
260a9803 DH |
261 | } |
262 | } | |
263 | ||
9b3f26c9 DH |
264 | /* set up caching before mapping the status, as map-status reads the |
265 | * first page of symlinks to see if they're really mountpoints */ | |
266 | inode->i_size = vnode->status.size; | |
267 | #ifdef CONFIG_AFS_FSCACHE | |
268 | vnode->cache = fscache_acquire_cookie(vnode->volume->cache, | |
269 | &afs_vnode_cache_index_def, | |
94d30ae9 | 270 | vnode, true); |
9b3f26c9 DH |
271 | #endif |
272 | ||
00d3b7a4 | 273 | ret = afs_inode_map_status(vnode, key); |
08e0e7c8 | 274 | if (ret < 0) |
1da177e4 LT |
275 | goto bad_inode; |
276 | ||
277 | /* success */ | |
260a9803 | 278 | clear_bit(AFS_VNODE_UNSET, &vnode->flags); |
08e0e7c8 | 279 | inode->i_flags |= S_NOATIME; |
1da177e4 | 280 | unlock_new_inode(inode); |
08e0e7c8 DH |
281 | _leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type); |
282 | return inode; | |
1da177e4 LT |
283 | |
284 | /* failure */ | |
ec26815a | 285 | bad_inode: |
9b3f26c9 DH |
286 | #ifdef CONFIG_AFS_FSCACHE |
287 | fscache_relinquish_cookie(vnode->cache, 0); | |
288 | vnode->cache = NULL; | |
289 | #endif | |
aa7fa240 | 290 | iget_failed(inode); |
1da177e4 | 291 | _leave(" = %d [bad]", ret); |
08e0e7c8 | 292 | return ERR_PTR(ret); |
ec26815a | 293 | } |
1da177e4 | 294 | |
416351f2 DH |
295 | /* |
296 | * mark the data attached to an inode as obsolete due to a write on the server | |
297 | * - might also want to ditch all the outstanding writes and dirty pages | |
298 | */ | |
299 | void afs_zap_data(struct afs_vnode *vnode) | |
300 | { | |
0f300ca9 | 301 | _enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode); |
416351f2 DH |
302 | |
303 | /* nuke all the non-dirty pages that aren't locked, mapped or being | |
0f300ca9 DH |
304 | * written back in a regular file and completely discard the pages in a |
305 | * directory or symlink */ | |
306 | if (S_ISREG(vnode->vfs_inode.i_mode)) | |
307 | invalidate_remote_inode(&vnode->vfs_inode); | |
308 | else | |
309 | invalidate_inode_pages2(vnode->vfs_inode.i_mapping); | |
416351f2 DH |
310 | } |
311 | ||
260a9803 DH |
312 | /* |
313 | * validate a vnode/inode | |
314 | * - there are several things we need to check | |
315 | * - parent dir data changes (rm, rmdir, rename, mkdir, create, link, | |
316 | * symlink) | |
317 | * - parent dir metadata changed (security changes) | |
318 | * - dentry data changed (write, truncate) | |
319 | * - dentry metadata changed (security changes) | |
320 | */ | |
321 | int afs_validate(struct afs_vnode *vnode, struct key *key) | |
322 | { | |
323 | int ret; | |
324 | ||
325 | _enter("{v={%x:%u} fl=%lx},%x", | |
326 | vnode->fid.vid, vnode->fid.vnode, vnode->flags, | |
327 | key_serial(key)); | |
328 | ||
329 | if (vnode->cb_promised && | |
330 | !test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) && | |
331 | !test_bit(AFS_VNODE_MODIFIED, &vnode->flags) && | |
332 | !test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) { | |
56e71431 | 333 | if (vnode->cb_expires < ktime_get_real_seconds() + 10) { |
260a9803 DH |
334 | _debug("callback expired"); |
335 | set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); | |
336 | } else { | |
337 | goto valid; | |
338 | } | |
339 | } | |
340 | ||
341 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) | |
342 | goto valid; | |
343 | ||
344 | mutex_lock(&vnode->validate_lock); | |
345 | ||
346 | /* if the promise has expired, we need to check the server again to get | |
347 | * a new promise - note that if the (parent) directory's metadata was | |
348 | * changed then the security may be different and we may no longer have | |
349 | * access */ | |
350 | if (!vnode->cb_promised || | |
351 | test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) { | |
352 | _debug("not promised"); | |
353 | ret = afs_vnode_fetch_status(vnode, NULL, key); | |
354 | if (ret < 0) | |
355 | goto error_unlock; | |
356 | _debug("new promise [fl=%lx]", vnode->flags); | |
357 | } | |
358 | ||
359 | if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { | |
360 | _debug("file already deleted"); | |
361 | ret = -ESTALE; | |
362 | goto error_unlock; | |
363 | } | |
364 | ||
365 | /* if the vnode's data version number changed then its contents are | |
366 | * different */ | |
416351f2 DH |
367 | if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) |
368 | afs_zap_data(vnode); | |
260a9803 DH |
369 | |
370 | clear_bit(AFS_VNODE_MODIFIED, &vnode->flags); | |
371 | mutex_unlock(&vnode->validate_lock); | |
372 | valid: | |
373 | _leave(" = 0"); | |
374 | return 0; | |
375 | ||
376 | error_unlock: | |
377 | mutex_unlock(&vnode->validate_lock); | |
378 | _leave(" = %d", ret); | |
379 | return ret; | |
380 | } | |
381 | ||
1da177e4 LT |
382 | /* |
383 | * read the attributes of an inode | |
384 | */ | |
a528d35e DH |
385 | int afs_getattr(const struct path *path, struct kstat *stat, |
386 | u32 request_mask, unsigned int query_flags) | |
1da177e4 | 387 | { |
a528d35e | 388 | struct inode *inode = d_inode(path->dentry); |
1da177e4 | 389 | |
d6e43f75 | 390 | _enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation); |
1da177e4 | 391 | |
1da177e4 | 392 | generic_fillattr(inode, stat); |
1da177e4 | 393 | return 0; |
ec26815a | 394 | } |
1da177e4 | 395 | |
bec5eb61 | 396 | /* |
397 | * discard an AFS inode | |
398 | */ | |
399 | int afs_drop_inode(struct inode *inode) | |
400 | { | |
401 | _enter(""); | |
402 | ||
403 | if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags)) | |
404 | return generic_delete_inode(inode); | |
405 | else | |
406 | return generic_drop_inode(inode); | |
407 | } | |
408 | ||
1da177e4 LT |
409 | /* |
410 | * clear an AFS inode | |
411 | */ | |
b57922d9 | 412 | void afs_evict_inode(struct inode *inode) |
1da177e4 | 413 | { |
00d3b7a4 | 414 | struct afs_permits *permits; |
1da177e4 LT |
415 | struct afs_vnode *vnode; |
416 | ||
417 | vnode = AFS_FS_I(inode); | |
418 | ||
416351f2 | 419 | _enter("{%x:%u.%d} v=%u x=%u t=%u }", |
260a9803 | 420 | vnode->fid.vid, |
1da177e4 | 421 | vnode->fid.vnode, |
260a9803 | 422 | vnode->fid.unique, |
1da177e4 LT |
423 | vnode->cb_version, |
424 | vnode->cb_expiry, | |
08e0e7c8 | 425 | vnode->cb_type); |
1da177e4 | 426 | |
08e0e7c8 DH |
427 | _debug("CLEAR INODE %p", inode); |
428 | ||
429 | ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); | |
430 | ||
91b0abe3 | 431 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 432 | clear_inode(inode); |
b57922d9 | 433 | |
08e0e7c8 DH |
434 | afs_give_up_callback(vnode); |
435 | ||
436 | if (vnode->server) { | |
437 | spin_lock(&vnode->server->fs_lock); | |
438 | rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes); | |
439 | spin_unlock(&vnode->server->fs_lock); | |
440 | afs_put_server(vnode->server); | |
441 | vnode->server = NULL; | |
442 | } | |
1da177e4 | 443 | |
31143d5d | 444 | ASSERT(list_empty(&vnode->writebacks)); |
08e0e7c8 | 445 | ASSERT(!vnode->cb_promised); |
1da177e4 | 446 | |
9b3f26c9 DH |
447 | #ifdef CONFIG_AFS_FSCACHE |
448 | fscache_relinquish_cookie(vnode->cache, 0); | |
1da177e4 LT |
449 | vnode->cache = NULL; |
450 | #endif | |
451 | ||
00d3b7a4 DH |
452 | mutex_lock(&vnode->permits_lock); |
453 | permits = vnode->permits; | |
1d7e4ebf | 454 | RCU_INIT_POINTER(vnode->permits, NULL); |
00d3b7a4 DH |
455 | mutex_unlock(&vnode->permits_lock); |
456 | if (permits) | |
457 | call_rcu(&permits->rcu, afs_zap_permits); | |
458 | ||
1da177e4 | 459 | _leave(""); |
ec26815a | 460 | } |
31143d5d DH |
461 | |
462 | /* | |
463 | * set the attributes of an inode | |
464 | */ | |
465 | int afs_setattr(struct dentry *dentry, struct iattr *attr) | |
466 | { | |
2b0143b5 | 467 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); |
31143d5d DH |
468 | struct key *key; |
469 | int ret; | |
470 | ||
a455589f AV |
471 | _enter("{%x:%u},{n=%pd},%x", |
472 | vnode->fid.vid, vnode->fid.vnode, dentry, | |
31143d5d DH |
473 | attr->ia_valid); |
474 | ||
475 | if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | | |
476 | ATTR_MTIME))) { | |
477 | _leave(" = 0 [unsupported]"); | |
478 | return 0; | |
479 | } | |
480 | ||
481 | /* flush any dirty data outstanding on a regular file */ | |
482 | if (S_ISREG(vnode->vfs_inode.i_mode)) { | |
483 | filemap_write_and_wait(vnode->vfs_inode.i_mapping); | |
484 | afs_writeback_all(vnode); | |
485 | } | |
486 | ||
487 | if (attr->ia_valid & ATTR_FILE) { | |
488 | key = attr->ia_file->private_data; | |
489 | } else { | |
490 | key = afs_request_key(vnode->volume->cell); | |
491 | if (IS_ERR(key)) { | |
492 | ret = PTR_ERR(key); | |
493 | goto error; | |
494 | } | |
495 | } | |
496 | ||
497 | ret = afs_vnode_setattr(vnode, key, attr); | |
498 | if (!(attr->ia_valid & ATTR_FILE)) | |
499 | key_put(key); | |
500 | ||
501 | error: | |
502 | _leave(" = %d", ret); | |
503 | return ret; | |
504 | } |