Commit | Line | Data |
---|---|---|
ec26815a DH |
1 | /* AFS superblock handling |
2 | * | |
08e0e7c8 | 3 | * Copyright (c) 2002, 2007 Red Hat, Inc. All rights reserved. |
1da177e4 LT |
4 | * |
5 | * This software may be freely redistributed under the terms of the | |
6 | * GNU General Public License. | |
7 | * | |
8 | * You should have received a copy of the GNU General Public License | |
9 | * along with this program; if not, write to the Free Software | |
10 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
11 | * | |
12 | * Authors: David Howells <dhowells@redhat.com> | |
44d1b980 | 13 | * David Woodhouse <dwmw2@infradead.org> |
1da177e4 LT |
14 | * |
15 | */ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
bec5eb61 | 19 | #include <linux/mount.h> |
1da177e4 LT |
20 | #include <linux/init.h> |
21 | #include <linux/slab.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/pagemap.h> | |
80c72fe4 | 24 | #include <linux/parser.h> |
45222b9e | 25 | #include <linux/statfs.h> |
e8edc6e0 | 26 | #include <linux/sched.h> |
f74f70f8 EB |
27 | #include <linux/nsproxy.h> |
28 | #include <net/net_namespace.h> | |
1da177e4 LT |
29 | #include "internal.h" |
30 | ||
31 | #define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */ | |
32 | ||
51cc5068 | 33 | static void afs_i_init_once(void *foo); |
f7442b3b AV |
34 | static struct dentry *afs_mount(struct file_system_type *fs_type, |
35 | int flags, const char *dev_name, void *data); | |
dde194a6 | 36 | static void afs_kill_super(struct super_block *sb); |
1da177e4 | 37 | static struct inode *afs_alloc_inode(struct super_block *sb); |
1da177e4 | 38 | static void afs_destroy_inode(struct inode *inode); |
45222b9e | 39 | static int afs_statfs(struct dentry *dentry, struct kstatfs *buf); |
1da177e4 | 40 | |
1f5ce9e9 | 41 | struct file_system_type afs_fs_type = { |
1da177e4 LT |
42 | .owner = THIS_MODULE, |
43 | .name = "afs", | |
f7442b3b | 44 | .mount = afs_mount, |
dde194a6 | 45 | .kill_sb = afs_kill_super, |
80c72fe4 | 46 | .fs_flags = 0, |
1da177e4 | 47 | }; |
7f78e035 | 48 | MODULE_ALIAS_FS("afs"); |
1da177e4 | 49 | |
ee9b6d61 | 50 | static const struct super_operations afs_super_ops = { |
45222b9e | 51 | .statfs = afs_statfs, |
1da177e4 | 52 | .alloc_inode = afs_alloc_inode, |
bec5eb61 | 53 | .drop_inode = afs_drop_inode, |
1da177e4 | 54 | .destroy_inode = afs_destroy_inode, |
b57922d9 | 55 | .evict_inode = afs_evict_inode, |
969729d5 | 56 | .show_options = generic_show_options, |
1da177e4 LT |
57 | }; |
58 | ||
e18b890b | 59 | static struct kmem_cache *afs_inode_cachep; |
1da177e4 LT |
60 | static atomic_t afs_count_active_inodes; |
61 | ||
80c72fe4 DH |
62 | enum { |
63 | afs_no_opt, | |
64 | afs_opt_cell, | |
65 | afs_opt_rwpath, | |
66 | afs_opt_vol, | |
bec5eb61 | 67 | afs_opt_autocell, |
80c72fe4 DH |
68 | }; |
69 | ||
a447c093 | 70 | static const match_table_t afs_options_list = { |
80c72fe4 DH |
71 | { afs_opt_cell, "cell=%s" }, |
72 | { afs_opt_rwpath, "rwpath" }, | |
73 | { afs_opt_vol, "vol=%s" }, | |
bec5eb61 | 74 | { afs_opt_autocell, "autocell" }, |
80c72fe4 DH |
75 | { afs_no_opt, NULL }, |
76 | }; | |
77 | ||
1da177e4 LT |
78 | /* |
79 | * initialise the filesystem | |
80 | */ | |
81 | int __init afs_fs_init(void) | |
82 | { | |
83 | int ret; | |
84 | ||
85 | _enter(""); | |
86 | ||
1da177e4 LT |
87 | /* create ourselves an inode cache */ |
88 | atomic_set(&afs_count_active_inodes, 0); | |
89 | ||
90 | ret = -ENOMEM; | |
91 | afs_inode_cachep = kmem_cache_create("afs_inode_cache", | |
92 | sizeof(struct afs_vnode), | |
93 | 0, | |
5d097056 | 94 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, |
20c2df83 | 95 | afs_i_init_once); |
1da177e4 LT |
96 | if (!afs_inode_cachep) { |
97 | printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n"); | |
98 | return ret; | |
99 | } | |
100 | ||
101 | /* now export our filesystem to lesser mortals */ | |
102 | ret = register_filesystem(&afs_fs_type); | |
103 | if (ret < 0) { | |
104 | kmem_cache_destroy(afs_inode_cachep); | |
08e0e7c8 | 105 | _leave(" = %d", ret); |
1da177e4 LT |
106 | return ret; |
107 | } | |
108 | ||
08e0e7c8 | 109 | _leave(" = 0"); |
1da177e4 | 110 | return 0; |
ec26815a | 111 | } |
1da177e4 | 112 | |
1da177e4 LT |
113 | /* |
114 | * clean up the filesystem | |
115 | */ | |
116 | void __exit afs_fs_exit(void) | |
117 | { | |
08e0e7c8 DH |
118 | _enter(""); |
119 | ||
120 | afs_mntpt_kill_timer(); | |
1da177e4 LT |
121 | unregister_filesystem(&afs_fs_type); |
122 | ||
123 | if (atomic_read(&afs_count_active_inodes) != 0) { | |
124 | printk("kAFS: %d active inode objects still present\n", | |
125 | atomic_read(&afs_count_active_inodes)); | |
126 | BUG(); | |
127 | } | |
128 | ||
8c0a8537 KS |
129 | /* |
130 | * Make sure all delayed rcu free inodes are flushed before we | |
131 | * destroy cache. | |
132 | */ | |
133 | rcu_barrier(); | |
1da177e4 | 134 | kmem_cache_destroy(afs_inode_cachep); |
08e0e7c8 | 135 | _leave(""); |
ec26815a | 136 | } |
1da177e4 | 137 | |
1da177e4 LT |
138 | /* |
139 | * parse the mount options | |
140 | * - this function has been shamelessly adapted from the ext3 fs which | |
141 | * shamelessly adapted it from the msdos fs | |
142 | */ | |
00d3b7a4 DH |
143 | static int afs_parse_options(struct afs_mount_params *params, |
144 | char *options, const char **devname) | |
1da177e4 | 145 | { |
08e0e7c8 | 146 | struct afs_cell *cell; |
80c72fe4 DH |
147 | substring_t args[MAX_OPT_ARGS]; |
148 | char *p; | |
149 | int token; | |
1da177e4 LT |
150 | |
151 | _enter("%s", options); | |
152 | ||
153 | options[PAGE_SIZE - 1] = 0; | |
154 | ||
80c72fe4 DH |
155 | while ((p = strsep(&options, ","))) { |
156 | if (!*p) | |
157 | continue; | |
1da177e4 | 158 | |
80c72fe4 DH |
159 | token = match_token(p, afs_options_list, args); |
160 | switch (token) { | |
161 | case afs_opt_cell: | |
162 | cell = afs_cell_lookup(args[0].from, | |
bec5eb61 | 163 | args[0].to - args[0].from, |
164 | false); | |
08e0e7c8 DH |
165 | if (IS_ERR(cell)) |
166 | return PTR_ERR(cell); | |
00d3b7a4 DH |
167 | afs_put_cell(params->cell); |
168 | params->cell = cell; | |
80c72fe4 DH |
169 | break; |
170 | ||
171 | case afs_opt_rwpath: | |
172 | params->rwpath = 1; | |
173 | break; | |
174 | ||
175 | case afs_opt_vol: | |
176 | *devname = args[0].from; | |
177 | break; | |
178 | ||
bec5eb61 | 179 | case afs_opt_autocell: |
180 | params->autocell = 1; | |
181 | break; | |
182 | ||
80c72fe4 DH |
183 | default: |
184 | printk(KERN_ERR "kAFS:" | |
185 | " Unknown or invalid mount option: '%s'\n", p); | |
186 | return -EINVAL; | |
1da177e4 | 187 | } |
1da177e4 LT |
188 | } |
189 | ||
80c72fe4 DH |
190 | _leave(" = 0"); |
191 | return 0; | |
ec26815a | 192 | } |
1da177e4 | 193 | |
00d3b7a4 DH |
194 | /* |
195 | * parse a device name to get cell name, volume name, volume type and R/W | |
196 | * selector | |
197 | * - this can be one of the following: | |
198 | * "%[cell:]volume[.]" R/W volume | |
199 | * "#[cell:]volume[.]" R/O or R/W volume (rwpath=0), | |
200 | * or R/W (rwpath=1) volume | |
201 | * "%[cell:]volume.readonly" R/O volume | |
202 | * "#[cell:]volume.readonly" R/O volume | |
203 | * "%[cell:]volume.backup" Backup volume | |
204 | * "#[cell:]volume.backup" Backup volume | |
205 | */ | |
206 | static int afs_parse_device_name(struct afs_mount_params *params, | |
207 | const char *name) | |
208 | { | |
209 | struct afs_cell *cell; | |
210 | const char *cellname, *suffix; | |
211 | int cellnamesz; | |
212 | ||
213 | _enter(",%s", name); | |
214 | ||
215 | if (!name) { | |
216 | printk(KERN_ERR "kAFS: no volume name specified\n"); | |
217 | return -EINVAL; | |
218 | } | |
219 | ||
220 | if ((name[0] != '%' && name[0] != '#') || !name[1]) { | |
221 | printk(KERN_ERR "kAFS: unparsable volume name\n"); | |
222 | return -EINVAL; | |
223 | } | |
224 | ||
225 | /* determine the type of volume we're looking for */ | |
226 | params->type = AFSVL_ROVOL; | |
227 | params->force = false; | |
228 | if (params->rwpath || name[0] == '%') { | |
229 | params->type = AFSVL_RWVOL; | |
230 | params->force = true; | |
231 | } | |
232 | name++; | |
233 | ||
234 | /* split the cell name out if there is one */ | |
235 | params->volname = strchr(name, ':'); | |
236 | if (params->volname) { | |
237 | cellname = name; | |
238 | cellnamesz = params->volname - name; | |
239 | params->volname++; | |
240 | } else { | |
241 | params->volname = name; | |
242 | cellname = NULL; | |
243 | cellnamesz = 0; | |
244 | } | |
245 | ||
246 | /* the volume type is further affected by a possible suffix */ | |
247 | suffix = strrchr(params->volname, '.'); | |
248 | if (suffix) { | |
249 | if (strcmp(suffix, ".readonly") == 0) { | |
250 | params->type = AFSVL_ROVOL; | |
251 | params->force = true; | |
252 | } else if (strcmp(suffix, ".backup") == 0) { | |
253 | params->type = AFSVL_BACKVOL; | |
254 | params->force = true; | |
255 | } else if (suffix[1] == 0) { | |
256 | } else { | |
257 | suffix = NULL; | |
258 | } | |
259 | } | |
260 | ||
261 | params->volnamesz = suffix ? | |
262 | suffix - params->volname : strlen(params->volname); | |
263 | ||
264 | _debug("cell %*.*s [%p]", | |
265 | cellnamesz, cellnamesz, cellname ?: "", params->cell); | |
266 | ||
267 | /* lookup the cell record */ | |
268 | if (cellname || !params->cell) { | |
bec5eb61 | 269 | cell = afs_cell_lookup(cellname, cellnamesz, true); |
00d3b7a4 | 270 | if (IS_ERR(cell)) { |
bec5eb61 | 271 | printk(KERN_ERR "kAFS: unable to lookup cell '%*.*s'\n", |
272 | cellnamesz, cellnamesz, cellname ?: ""); | |
00d3b7a4 DH |
273 | return PTR_ERR(cell); |
274 | } | |
275 | afs_put_cell(params->cell); | |
276 | params->cell = cell; | |
277 | } | |
278 | ||
279 | _debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s", | |
280 | params->cell->name, params->cell, | |
281 | params->volnamesz, params->volnamesz, params->volname, | |
282 | suffix ?: "-", params->type, params->force ? " FORCE" : ""); | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
1da177e4 LT |
287 | /* |
288 | * check a superblock to see if it's the one we're looking for | |
289 | */ | |
290 | static int afs_test_super(struct super_block *sb, void *data) | |
291 | { | |
dde194a6 | 292 | struct afs_super_info *as1 = data; |
1da177e4 LT |
293 | struct afs_super_info *as = sb->s_fs_info; |
294 | ||
dde194a6 AV |
295 | return as->volume == as1->volume; |
296 | } | |
297 | ||
298 | static int afs_set_super(struct super_block *sb, void *data) | |
299 | { | |
300 | sb->s_fs_info = data; | |
301 | return set_anon_super(sb, NULL); | |
ec26815a | 302 | } |
1da177e4 | 303 | |
1da177e4 LT |
304 | /* |
305 | * fill in the superblock | |
306 | */ | |
dde194a6 AV |
307 | static int afs_fill_super(struct super_block *sb, |
308 | struct afs_mount_params *params) | |
1da177e4 | 309 | { |
dde194a6 | 310 | struct afs_super_info *as = sb->s_fs_info; |
1da177e4 | 311 | struct afs_fid fid; |
1da177e4 LT |
312 | struct inode *inode = NULL; |
313 | int ret; | |
314 | ||
08e0e7c8 | 315 | _enter(""); |
1da177e4 | 316 | |
1da177e4 | 317 | /* fill in the superblock */ |
09cbfeaf KS |
318 | sb->s_blocksize = PAGE_SIZE; |
319 | sb->s_blocksize_bits = PAGE_SHIFT; | |
1da177e4 LT |
320 | sb->s_magic = AFS_FS_MAGIC; |
321 | sb->s_op = &afs_super_ops; | |
e1da0222 | 322 | sb->s_bdi = &as->volume->bdi; |
2e41ae22 | 323 | strlcpy(sb->s_id, as->volume->vlocation->vldb.name, sizeof(sb->s_id)); |
1da177e4 LT |
324 | |
325 | /* allocate the root inode and dentry */ | |
326 | fid.vid = as->volume->vid; | |
327 | fid.vnode = 1; | |
328 | fid.unique = 1; | |
260a9803 | 329 | inode = afs_iget(sb, params->key, &fid, NULL, NULL); |
08e0e7c8 | 330 | if (IS_ERR(inode)) |
dde194a6 | 331 | return PTR_ERR(inode); |
1da177e4 | 332 | |
bec5eb61 | 333 | if (params->autocell) |
334 | set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags); | |
335 | ||
1da177e4 | 336 | ret = -ENOMEM; |
48fde701 AV |
337 | sb->s_root = d_make_root(inode); |
338 | if (!sb->s_root) | |
1da177e4 LT |
339 | goto error; |
340 | ||
d61dcce2 | 341 | sb->s_d_op = &afs_fs_dentry_operations; |
1da177e4 | 342 | |
08e0e7c8 | 343 | _leave(" = 0"); |
1da177e4 LT |
344 | return 0; |
345 | ||
ec26815a | 346 | error: |
08e0e7c8 | 347 | _leave(" = %d", ret); |
1da177e4 | 348 | return ret; |
ec26815a | 349 | } |
1da177e4 | 350 | |
1da177e4 LT |
351 | /* |
352 | * get an AFS superblock | |
1da177e4 | 353 | */ |
f7442b3b AV |
354 | static struct dentry *afs_mount(struct file_system_type *fs_type, |
355 | int flags, const char *dev_name, void *options) | |
1da177e4 LT |
356 | { |
357 | struct afs_mount_params params; | |
358 | struct super_block *sb; | |
08e0e7c8 | 359 | struct afs_volume *vol; |
00d3b7a4 | 360 | struct key *key; |
969729d5 | 361 | char *new_opts = kstrdup(options, GFP_KERNEL); |
dde194a6 | 362 | struct afs_super_info *as; |
1da177e4 LT |
363 | int ret; |
364 | ||
365 | _enter(",,%s,%p", dev_name, options); | |
366 | ||
367 | memset(¶ms, 0, sizeof(params)); | |
368 | ||
f74f70f8 EB |
369 | ret = -EINVAL; |
370 | if (current->nsproxy->net_ns != &init_net) | |
371 | goto error; | |
372 | ||
00d3b7a4 | 373 | /* parse the options and device name */ |
1da177e4 | 374 | if (options) { |
00d3b7a4 | 375 | ret = afs_parse_options(¶ms, options, &dev_name); |
1da177e4 LT |
376 | if (ret < 0) |
377 | goto error; | |
1da177e4 LT |
378 | } |
379 | ||
00d3b7a4 DH |
380 | ret = afs_parse_device_name(¶ms, dev_name); |
381 | if (ret < 0) | |
382 | goto error; | |
383 | ||
384 | /* try and do the mount securely */ | |
385 | key = afs_request_key(params.cell); | |
386 | if (IS_ERR(key)) { | |
387 | _leave(" = %ld [key]", PTR_ERR(key)); | |
388 | ret = PTR_ERR(key); | |
389 | goto error; | |
390 | } | |
391 | params.key = key; | |
392 | ||
1da177e4 | 393 | /* parse the device name */ |
00d3b7a4 | 394 | vol = afs_volume_lookup(¶ms); |
08e0e7c8 DH |
395 | if (IS_ERR(vol)) { |
396 | ret = PTR_ERR(vol); | |
1da177e4 | 397 | goto error; |
08e0e7c8 | 398 | } |
dde194a6 AV |
399 | |
400 | /* allocate a superblock info record */ | |
401 | as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL); | |
402 | if (!as) { | |
403 | ret = -ENOMEM; | |
404 | afs_put_volume(vol); | |
405 | goto error; | |
406 | } | |
407 | as->volume = vol; | |
1da177e4 LT |
408 | |
409 | /* allocate a deviceless superblock */ | |
9249e17f | 410 | sb = sget(fs_type, afs_test_super, afs_set_super, flags, as); |
08e0e7c8 DH |
411 | if (IS_ERR(sb)) { |
412 | ret = PTR_ERR(sb); | |
dde194a6 AV |
413 | afs_put_volume(vol); |
414 | kfree(as); | |
1da177e4 | 415 | goto error; |
08e0e7c8 | 416 | } |
1da177e4 | 417 | |
436058a4 DH |
418 | if (!sb->s_root) { |
419 | /* initial superblock/root creation */ | |
420 | _debug("create"); | |
436058a4 DH |
421 | ret = afs_fill_super(sb, ¶ms); |
422 | if (ret < 0) { | |
6f5bbff9 | 423 | deactivate_locked_super(sb); |
436058a4 DH |
424 | goto error; |
425 | } | |
2a32cebd | 426 | save_mount_options(sb, new_opts); |
436058a4 DH |
427 | sb->s_flags |= MS_ACTIVE; |
428 | } else { | |
429 | _debug("reuse"); | |
430 | ASSERTCMP(sb->s_flags, &, MS_ACTIVE); | |
dde194a6 AV |
431 | afs_put_volume(vol); |
432 | kfree(as); | |
1da177e4 | 433 | } |
1da177e4 | 434 | |
00d3b7a4 | 435 | afs_put_cell(params.cell); |
2a32cebd | 436 | kfree(new_opts); |
08e0e7c8 | 437 | _leave(" = 0 [%p]", sb); |
f7442b3b | 438 | return dget(sb->s_root); |
1da177e4 | 439 | |
ec26815a | 440 | error: |
00d3b7a4 DH |
441 | afs_put_cell(params.cell); |
442 | key_put(params.key); | |
969729d5 | 443 | kfree(new_opts); |
1da177e4 | 444 | _leave(" = %d", ret); |
f7442b3b | 445 | return ERR_PTR(ret); |
ec26815a | 446 | } |
1da177e4 | 447 | |
dde194a6 | 448 | static void afs_kill_super(struct super_block *sb) |
1da177e4 LT |
449 | { |
450 | struct afs_super_info *as = sb->s_fs_info; | |
dde194a6 | 451 | kill_anon_super(sb); |
1da177e4 | 452 | afs_put_volume(as->volume); |
dde194a6 | 453 | kfree(as); |
ec26815a | 454 | } |
1da177e4 | 455 | |
1da177e4 LT |
456 | /* |
457 | * initialise an inode cache slab element prior to any use | |
458 | */ | |
51cc5068 | 459 | static void afs_i_init_once(void *_vnode) |
1da177e4 | 460 | { |
ec26815a | 461 | struct afs_vnode *vnode = _vnode; |
1da177e4 | 462 | |
a35afb83 CL |
463 | memset(vnode, 0, sizeof(*vnode)); |
464 | inode_init_once(&vnode->vfs_inode); | |
465 | init_waitqueue_head(&vnode->update_waitq); | |
466 | mutex_init(&vnode->permits_lock); | |
467 | mutex_init(&vnode->validate_lock); | |
468 | spin_lock_init(&vnode->writeback_lock); | |
469 | spin_lock_init(&vnode->lock); | |
470 | INIT_LIST_HEAD(&vnode->writebacks); | |
e8d6c554 DH |
471 | INIT_LIST_HEAD(&vnode->pending_locks); |
472 | INIT_LIST_HEAD(&vnode->granted_locks); | |
473 | INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work); | |
a35afb83 | 474 | INIT_WORK(&vnode->cb_broken_work, afs_broken_callback_work); |
ec26815a | 475 | } |
1da177e4 | 476 | |
1da177e4 LT |
477 | /* |
478 | * allocate an AFS inode struct from our slab cache | |
479 | */ | |
480 | static struct inode *afs_alloc_inode(struct super_block *sb) | |
481 | { | |
482 | struct afs_vnode *vnode; | |
483 | ||
ec26815a | 484 | vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
485 | if (!vnode) |
486 | return NULL; | |
487 | ||
488 | atomic_inc(&afs_count_active_inodes); | |
489 | ||
490 | memset(&vnode->fid, 0, sizeof(vnode->fid)); | |
491 | memset(&vnode->status, 0, sizeof(vnode->status)); | |
492 | ||
493 | vnode->volume = NULL; | |
494 | vnode->update_cnt = 0; | |
260a9803 | 495 | vnode->flags = 1 << AFS_VNODE_UNSET; |
08e0e7c8 | 496 | vnode->cb_promised = false; |
1da177e4 | 497 | |
0f300ca9 | 498 | _leave(" = %p", &vnode->vfs_inode); |
1da177e4 | 499 | return &vnode->vfs_inode; |
ec26815a | 500 | } |
1da177e4 | 501 | |
fa0d7e3d NP |
502 | static void afs_i_callback(struct rcu_head *head) |
503 | { | |
504 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
505 | struct afs_vnode *vnode = AFS_FS_I(inode); | |
fa0d7e3d NP |
506 | kmem_cache_free(afs_inode_cachep, vnode); |
507 | } | |
508 | ||
1da177e4 LT |
509 | /* |
510 | * destroy an AFS inode struct | |
511 | */ | |
512 | static void afs_destroy_inode(struct inode *inode) | |
513 | { | |
08e0e7c8 DH |
514 | struct afs_vnode *vnode = AFS_FS_I(inode); |
515 | ||
0f300ca9 | 516 | _enter("%p{%x:%u}", inode, vnode->fid.vid, vnode->fid.vnode); |
1da177e4 | 517 | |
08e0e7c8 DH |
518 | _debug("DESTROY INODE %p", inode); |
519 | ||
520 | ASSERTCMP(vnode->server, ==, NULL); | |
521 | ||
fa0d7e3d | 522 | call_rcu(&inode->i_rcu, afs_i_callback); |
1da177e4 | 523 | atomic_dec(&afs_count_active_inodes); |
ec26815a | 524 | } |
45222b9e DH |
525 | |
526 | /* | |
527 | * return information about an AFS volume | |
528 | */ | |
529 | static int afs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
530 | { | |
531 | struct afs_volume_status vs; | |
2b0143b5 | 532 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); |
45222b9e DH |
533 | struct key *key; |
534 | int ret; | |
535 | ||
536 | key = afs_request_key(vnode->volume->cell); | |
537 | if (IS_ERR(key)) | |
538 | return PTR_ERR(key); | |
539 | ||
540 | ret = afs_vnode_get_volume_status(vnode, key, &vs); | |
541 | key_put(key); | |
542 | if (ret < 0) { | |
543 | _leave(" = %d", ret); | |
544 | return ret; | |
545 | } | |
546 | ||
547 | buf->f_type = dentry->d_sb->s_magic; | |
548 | buf->f_bsize = AFS_BLOCK_SIZE; | |
549 | buf->f_namelen = AFSNAMEMAX - 1; | |
550 | ||
551 | if (vs.max_quota == 0) | |
552 | buf->f_blocks = vs.part_max_blocks; | |
553 | else | |
554 | buf->f_blocks = vs.max_quota; | |
555 | buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use; | |
556 | return 0; | |
557 | } |