Commit | Line | Data |
---|---|---|
ec26815a DH |
1 | /* AFS superblock handling |
2 | * | |
13fcc683 | 3 | * Copyright (c) 2002, 2007, 2018 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> | |
13fcc683 | 24 | #include <linux/fs_parser.h> |
45222b9e | 25 | #include <linux/statfs.h> |
e8edc6e0 | 26 | #include <linux/sched.h> |
f74f70f8 | 27 | #include <linux/nsproxy.h> |
f044c884 | 28 | #include <linux/magic.h> |
f74f70f8 | 29 | #include <net/net_namespace.h> |
1da177e4 LT |
30 | #include "internal.h" |
31 | ||
51cc5068 | 32 | static void afs_i_init_once(void *foo); |
dde194a6 | 33 | static void afs_kill_super(struct super_block *sb); |
1da177e4 | 34 | static struct inode *afs_alloc_inode(struct super_block *sb); |
1da177e4 | 35 | static void afs_destroy_inode(struct inode *inode); |
51b9fe48 | 36 | static void afs_free_inode(struct inode *inode); |
45222b9e | 37 | static int afs_statfs(struct dentry *dentry, struct kstatfs *buf); |
677018a6 DH |
38 | static int afs_show_devname(struct seq_file *m, struct dentry *root); |
39 | static int afs_show_options(struct seq_file *m, struct dentry *root); | |
13fcc683 DH |
40 | static int afs_init_fs_context(struct fs_context *fc); |
41 | static const struct fs_parameter_description afs_fs_parameters; | |
1da177e4 | 42 | |
1f5ce9e9 | 43 | struct file_system_type afs_fs_type = { |
13fcc683 DH |
44 | .owner = THIS_MODULE, |
45 | .name = "afs", | |
46 | .init_fs_context = afs_init_fs_context, | |
47 | .parameters = &afs_fs_parameters, | |
48 | .kill_sb = afs_kill_super, | |
79ddbfa5 | 49 | .fs_flags = FS_RENAME_DOES_D_MOVE, |
1da177e4 | 50 | }; |
7f78e035 | 51 | MODULE_ALIAS_FS("afs"); |
1da177e4 | 52 | |
5b86d4ff DH |
53 | int afs_net_id; |
54 | ||
ee9b6d61 | 55 | static const struct super_operations afs_super_ops = { |
45222b9e | 56 | .statfs = afs_statfs, |
1da177e4 | 57 | .alloc_inode = afs_alloc_inode, |
bec5eb61 | 58 | .drop_inode = afs_drop_inode, |
1da177e4 | 59 | .destroy_inode = afs_destroy_inode, |
51b9fe48 | 60 | .free_inode = afs_free_inode, |
b57922d9 | 61 | .evict_inode = afs_evict_inode, |
677018a6 DH |
62 | .show_devname = afs_show_devname, |
63 | .show_options = afs_show_options, | |
1da177e4 LT |
64 | }; |
65 | ||
e18b890b | 66 | static struct kmem_cache *afs_inode_cachep; |
1da177e4 LT |
67 | static atomic_t afs_count_active_inodes; |
68 | ||
13fcc683 DH |
69 | enum afs_param { |
70 | Opt_autocell, | |
13fcc683 | 71 | Opt_dyn, |
6c6c1d63 | 72 | Opt_flock, |
13fcc683 | 73 | Opt_source, |
80c72fe4 DH |
74 | }; |
75 | ||
13fcc683 DH |
76 | static const struct fs_parameter_spec afs_param_specs[] = { |
77 | fsparam_flag ("autocell", Opt_autocell), | |
13fcc683 | 78 | fsparam_flag ("dyn", Opt_dyn), |
6c6c1d63 | 79 | fsparam_enum ("flock", Opt_flock), |
13fcc683 | 80 | fsparam_string("source", Opt_source), |
13fcc683 DH |
81 | {} |
82 | }; | |
83 | ||
6c6c1d63 DH |
84 | static const struct fs_parameter_enum afs_param_enums[] = { |
85 | { Opt_flock, "local", afs_flock_mode_local }, | |
86 | { Opt_flock, "openafs", afs_flock_mode_openafs }, | |
87 | { Opt_flock, "strict", afs_flock_mode_strict }, | |
88 | { Opt_flock, "write", afs_flock_mode_write }, | |
89 | {} | |
90 | }; | |
91 | ||
13fcc683 DH |
92 | static const struct fs_parameter_description afs_fs_parameters = { |
93 | .name = "kAFS", | |
94 | .specs = afs_param_specs, | |
6c6c1d63 | 95 | .enums = afs_param_enums, |
80c72fe4 DH |
96 | }; |
97 | ||
1da177e4 LT |
98 | /* |
99 | * initialise the filesystem | |
100 | */ | |
101 | int __init afs_fs_init(void) | |
102 | { | |
103 | int ret; | |
104 | ||
105 | _enter(""); | |
106 | ||
1da177e4 LT |
107 | /* create ourselves an inode cache */ |
108 | atomic_set(&afs_count_active_inodes, 0); | |
109 | ||
110 | ret = -ENOMEM; | |
111 | afs_inode_cachep = kmem_cache_create("afs_inode_cache", | |
112 | sizeof(struct afs_vnode), | |
113 | 0, | |
5d097056 | 114 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, |
20c2df83 | 115 | afs_i_init_once); |
1da177e4 LT |
116 | if (!afs_inode_cachep) { |
117 | printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n"); | |
118 | return ret; | |
119 | } | |
120 | ||
121 | /* now export our filesystem to lesser mortals */ | |
122 | ret = register_filesystem(&afs_fs_type); | |
123 | if (ret < 0) { | |
124 | kmem_cache_destroy(afs_inode_cachep); | |
08e0e7c8 | 125 | _leave(" = %d", ret); |
1da177e4 LT |
126 | return ret; |
127 | } | |
128 | ||
08e0e7c8 | 129 | _leave(" = 0"); |
1da177e4 | 130 | return 0; |
ec26815a | 131 | } |
1da177e4 | 132 | |
1da177e4 LT |
133 | /* |
134 | * clean up the filesystem | |
135 | */ | |
5b86d4ff | 136 | void afs_fs_exit(void) |
1da177e4 | 137 | { |
08e0e7c8 DH |
138 | _enter(""); |
139 | ||
140 | afs_mntpt_kill_timer(); | |
1da177e4 LT |
141 | unregister_filesystem(&afs_fs_type); |
142 | ||
143 | if (atomic_read(&afs_count_active_inodes) != 0) { | |
144 | printk("kAFS: %d active inode objects still present\n", | |
145 | atomic_read(&afs_count_active_inodes)); | |
146 | BUG(); | |
147 | } | |
148 | ||
8c0a8537 KS |
149 | /* |
150 | * Make sure all delayed rcu free inodes are flushed before we | |
151 | * destroy cache. | |
152 | */ | |
153 | rcu_barrier(); | |
1da177e4 | 154 | kmem_cache_destroy(afs_inode_cachep); |
08e0e7c8 | 155 | _leave(""); |
ec26815a | 156 | } |
1da177e4 | 157 | |
677018a6 DH |
158 | /* |
159 | * Display the mount device name in /proc/mounts. | |
160 | */ | |
161 | static int afs_show_devname(struct seq_file *m, struct dentry *root) | |
162 | { | |
d2ddc776 | 163 | struct afs_super_info *as = AFS_FS_S(root->d_sb); |
677018a6 | 164 | struct afs_volume *volume = as->volume; |
d2ddc776 | 165 | struct afs_cell *cell = as->cell; |
677018a6 DH |
166 | const char *suf = ""; |
167 | char pref = '%'; | |
168 | ||
4d673da1 DH |
169 | if (as->dyn_root) { |
170 | seq_puts(m, "none"); | |
171 | return 0; | |
172 | } | |
66c7e1d3 | 173 | |
677018a6 DH |
174 | switch (volume->type) { |
175 | case AFSVL_RWVOL: | |
176 | break; | |
177 | case AFSVL_ROVOL: | |
178 | pref = '#'; | |
179 | if (volume->type_force) | |
180 | suf = ".readonly"; | |
181 | break; | |
182 | case AFSVL_BACKVOL: | |
183 | pref = '#'; | |
184 | suf = ".backup"; | |
185 | break; | |
186 | } | |
187 | ||
d2ddc776 | 188 | seq_printf(m, "%c%s:%s%s", pref, cell->name, volume->name, suf); |
677018a6 DH |
189 | return 0; |
190 | } | |
191 | ||
192 | /* | |
193 | * Display the mount options in /proc/mounts. | |
194 | */ | |
195 | static int afs_show_options(struct seq_file *m, struct dentry *root) | |
196 | { | |
4d673da1 | 197 | struct afs_super_info *as = AFS_FS_S(root->d_sb); |
6c6c1d63 | 198 | const char *p = NULL; |
4d673da1 DH |
199 | |
200 | if (as->dyn_root) | |
201 | seq_puts(m, ",dyn"); | |
677018a6 | 202 | if (test_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(d_inode(root))->flags)) |
4d673da1 | 203 | seq_puts(m, ",autocell"); |
6c6c1d63 DH |
204 | switch (as->flock_mode) { |
205 | case afs_flock_mode_unset: break; | |
206 | case afs_flock_mode_local: p = "local"; break; | |
207 | case afs_flock_mode_openafs: p = "openafs"; break; | |
208 | case afs_flock_mode_strict: p = "strict"; break; | |
209 | case afs_flock_mode_write: p = "write"; break; | |
210 | } | |
211 | if (p) | |
212 | seq_printf(m, ",flock=%s", p); | |
213 | ||
677018a6 DH |
214 | return 0; |
215 | } | |
216 | ||
1da177e4 | 217 | /* |
13fcc683 DH |
218 | * Parse the source name to get cell name, volume name, volume type and R/W |
219 | * selector. | |
220 | * | |
221 | * This can be one of the following: | |
00d3b7a4 | 222 | * "%[cell:]volume[.]" R/W volume |
c99c2171 DH |
223 | * "#[cell:]volume[.]" R/O or R/W volume (R/O parent), |
224 | * or R/W (R/W parent) volume | |
00d3b7a4 DH |
225 | * "%[cell:]volume.readonly" R/O volume |
226 | * "#[cell:]volume.readonly" R/O volume | |
227 | * "%[cell:]volume.backup" Backup volume | |
228 | * "#[cell:]volume.backup" Backup volume | |
229 | */ | |
13fcc683 | 230 | static int afs_parse_source(struct fs_context *fc, struct fs_parameter *param) |
00d3b7a4 | 231 | { |
13fcc683 | 232 | struct afs_fs_context *ctx = fc->fs_private; |
00d3b7a4 | 233 | struct afs_cell *cell; |
13fcc683 | 234 | const char *cellname, *suffix, *name = param->string; |
00d3b7a4 DH |
235 | int cellnamesz; |
236 | ||
237 | _enter(",%s", name); | |
66c7e1d3 | 238 | |
00d3b7a4 DH |
239 | if (!name) { |
240 | printk(KERN_ERR "kAFS: no volume name specified\n"); | |
241 | return -EINVAL; | |
242 | } | |
243 | ||
244 | if ((name[0] != '%' && name[0] != '#') || !name[1]) { | |
13fcc683 DH |
245 | /* To use dynroot, we don't want to have to provide a source */ |
246 | if (strcmp(name, "none") == 0) { | |
247 | ctx->no_cell = true; | |
248 | return 0; | |
249 | } | |
00d3b7a4 DH |
250 | printk(KERN_ERR "kAFS: unparsable volume name\n"); |
251 | return -EINVAL; | |
252 | } | |
253 | ||
254 | /* determine the type of volume we're looking for */ | |
c99c2171 | 255 | if (name[0] == '%') { |
13fcc683 DH |
256 | ctx->type = AFSVL_RWVOL; |
257 | ctx->force = true; | |
00d3b7a4 DH |
258 | } |
259 | name++; | |
260 | ||
261 | /* split the cell name out if there is one */ | |
13fcc683 DH |
262 | ctx->volname = strchr(name, ':'); |
263 | if (ctx->volname) { | |
00d3b7a4 | 264 | cellname = name; |
13fcc683 DH |
265 | cellnamesz = ctx->volname - name; |
266 | ctx->volname++; | |
00d3b7a4 | 267 | } else { |
13fcc683 | 268 | ctx->volname = name; |
00d3b7a4 DH |
269 | cellname = NULL; |
270 | cellnamesz = 0; | |
271 | } | |
272 | ||
273 | /* the volume type is further affected by a possible suffix */ | |
13fcc683 | 274 | suffix = strrchr(ctx->volname, '.'); |
00d3b7a4 DH |
275 | if (suffix) { |
276 | if (strcmp(suffix, ".readonly") == 0) { | |
13fcc683 DH |
277 | ctx->type = AFSVL_ROVOL; |
278 | ctx->force = true; | |
00d3b7a4 | 279 | } else if (strcmp(suffix, ".backup") == 0) { |
13fcc683 DH |
280 | ctx->type = AFSVL_BACKVOL; |
281 | ctx->force = true; | |
00d3b7a4 DH |
282 | } else if (suffix[1] == 0) { |
283 | } else { | |
284 | suffix = NULL; | |
285 | } | |
286 | } | |
287 | ||
13fcc683 DH |
288 | ctx->volnamesz = suffix ? |
289 | suffix - ctx->volname : strlen(ctx->volname); | |
00d3b7a4 DH |
290 | |
291 | _debug("cell %*.*s [%p]", | |
13fcc683 | 292 | cellnamesz, cellnamesz, cellname ?: "", ctx->cell); |
00d3b7a4 DH |
293 | |
294 | /* lookup the cell record */ | |
13fcc683 DH |
295 | if (cellname) { |
296 | cell = afs_lookup_cell(ctx->net, cellname, cellnamesz, | |
989782dc | 297 | NULL, false); |
00d3b7a4 | 298 | if (IS_ERR(cell)) { |
13fcc683 | 299 | pr_err("kAFS: unable to lookup cell '%*.*s'\n", |
bec5eb61 | 300 | cellnamesz, cellnamesz, cellname ?: ""); |
00d3b7a4 DH |
301 | return PTR_ERR(cell); |
302 | } | |
13fcc683 DH |
303 | afs_put_cell(ctx->net, ctx->cell); |
304 | ctx->cell = cell; | |
00d3b7a4 DH |
305 | } |
306 | ||
307 | _debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s", | |
13fcc683 DH |
308 | ctx->cell->name, ctx->cell, |
309 | ctx->volnamesz, ctx->volnamesz, ctx->volname, | |
310 | suffix ?: "-", ctx->type, ctx->force ? " FORCE" : ""); | |
311 | ||
312 | fc->source = param->string; | |
313 | param->string = NULL; | |
314 | return 0; | |
315 | } | |
316 | ||
317 | /* | |
318 | * Parse a single mount parameter. | |
319 | */ | |
320 | static int afs_parse_param(struct fs_context *fc, struct fs_parameter *param) | |
321 | { | |
322 | struct fs_parse_result result; | |
323 | struct afs_fs_context *ctx = fc->fs_private; | |
13fcc683 DH |
324 | int opt; |
325 | ||
326 | opt = fs_parse(fc, &afs_fs_parameters, param, &result); | |
327 | if (opt < 0) | |
328 | return opt; | |
329 | ||
330 | switch (opt) { | |
13fcc683 DH |
331 | case Opt_source: |
332 | return afs_parse_source(fc, param); | |
333 | ||
334 | case Opt_autocell: | |
335 | ctx->autocell = true; | |
336 | break; | |
337 | ||
338 | case Opt_dyn: | |
339 | ctx->dyn_root = true; | |
340 | break; | |
341 | ||
6c6c1d63 DH |
342 | case Opt_flock: |
343 | ctx->flock_mode = result.uint_32; | |
344 | break; | |
345 | ||
13fcc683 DH |
346 | default: |
347 | return -EINVAL; | |
348 | } | |
349 | ||
350 | _leave(" = 0"); | |
351 | return 0; | |
352 | } | |
353 | ||
354 | /* | |
355 | * Validate the options, get the cell key and look up the volume. | |
356 | */ | |
357 | static int afs_validate_fc(struct fs_context *fc) | |
358 | { | |
359 | struct afs_fs_context *ctx = fc->fs_private; | |
360 | struct afs_volume *volume; | |
361 | struct key *key; | |
362 | ||
363 | if (!ctx->dyn_root) { | |
364 | if (ctx->no_cell) { | |
365 | pr_warn("kAFS: Can only specify source 'none' with -o dyn\n"); | |
366 | return -EINVAL; | |
367 | } | |
368 | ||
369 | if (!ctx->cell) { | |
370 | pr_warn("kAFS: No cell specified\n"); | |
371 | return -EDESTADDRREQ; | |
372 | } | |
373 | ||
374 | /* We try to do the mount securely. */ | |
375 | key = afs_request_key(ctx->cell); | |
376 | if (IS_ERR(key)) | |
377 | return PTR_ERR(key); | |
378 | ||
379 | ctx->key = key; | |
380 | ||
381 | if (ctx->volume) { | |
382 | afs_put_volume(ctx->cell, ctx->volume); | |
383 | ctx->volume = NULL; | |
384 | } | |
385 | ||
386 | volume = afs_create_volume(ctx); | |
387 | if (IS_ERR(volume)) | |
388 | return PTR_ERR(volume); | |
389 | ||
390 | ctx->volume = volume; | |
391 | } | |
00d3b7a4 DH |
392 | |
393 | return 0; | |
394 | } | |
395 | ||
1da177e4 LT |
396 | /* |
397 | * check a superblock to see if it's the one we're looking for | |
398 | */ | |
13fcc683 | 399 | static int afs_test_super(struct super_block *sb, struct fs_context *fc) |
1da177e4 | 400 | { |
13fcc683 | 401 | struct afs_fs_context *ctx = fc->fs_private; |
d2ddc776 | 402 | struct afs_super_info *as = AFS_FS_S(sb); |
1da177e4 | 403 | |
13fcc683 | 404 | return (as->net_ns == fc->net_ns && |
4d673da1 | 405 | as->volume && |
13fcc683 | 406 | as->volume->vid == ctx->volume->vid && |
0da0b7fd | 407 | !as->dyn_root); |
4d673da1 DH |
408 | } |
409 | ||
13fcc683 | 410 | static int afs_dynroot_test_super(struct super_block *sb, struct fs_context *fc) |
4d673da1 | 411 | { |
0da0b7fd DH |
412 | struct afs_super_info *as = AFS_FS_S(sb); |
413 | ||
13fcc683 | 414 | return (as->net_ns == fc->net_ns && |
0da0b7fd | 415 | as->dyn_root); |
dde194a6 AV |
416 | } |
417 | ||
13fcc683 | 418 | static int afs_set_super(struct super_block *sb, struct fs_context *fc) |
dde194a6 | 419 | { |
dde194a6 | 420 | return set_anon_super(sb, NULL); |
ec26815a | 421 | } |
1da177e4 | 422 | |
1da177e4 LT |
423 | /* |
424 | * fill in the superblock | |
425 | */ | |
13fcc683 | 426 | static int afs_fill_super(struct super_block *sb, struct afs_fs_context *ctx) |
1da177e4 | 427 | { |
d2ddc776 | 428 | struct afs_super_info *as = AFS_FS_S(sb); |
b8359153 | 429 | struct afs_iget_data iget_data; |
1da177e4 LT |
430 | struct inode *inode = NULL; |
431 | int ret; | |
432 | ||
08e0e7c8 | 433 | _enter(""); |
1da177e4 | 434 | |
1da177e4 | 435 | /* fill in the superblock */ |
09cbfeaf KS |
436 | sb->s_blocksize = PAGE_SIZE; |
437 | sb->s_blocksize_bits = PAGE_SHIFT; | |
1da177e4 LT |
438 | sb->s_magic = AFS_FS_MAGIC; |
439 | sb->s_op = &afs_super_ops; | |
4d673da1 DH |
440 | if (!as->dyn_root) |
441 | sb->s_xattr = afs_xattr_handlers; | |
edd3ba94 JK |
442 | ret = super_setup_bdi(sb); |
443 | if (ret) | |
444 | return ret; | |
b5420237 | 445 | sb->s_bdi->ra_pages = VM_READAHEAD_PAGES; |
1da177e4 LT |
446 | |
447 | /* allocate the root inode and dentry */ | |
4d673da1 DH |
448 | if (as->dyn_root) { |
449 | inode = afs_iget_pseudo_dir(sb, true); | |
450 | sb->s_flags |= SB_RDONLY; | |
451 | } else { | |
3b6492df | 452 | sprintf(sb->s_id, "%llu", as->volume->vid); |
4d673da1 | 453 | afs_activate_volume(as->volume); |
b8359153 DH |
454 | iget_data.fid.vid = as->volume->vid; |
455 | iget_data.fid.vnode = 1; | |
456 | iget_data.fid.vnode_hi = 0; | |
457 | iget_data.fid.unique = 1; | |
458 | iget_data.cb_v_break = as->volume->cb_v_break; | |
459 | iget_data.cb_s_break = 0; | |
460 | inode = afs_iget(sb, ctx->key, &iget_data, NULL, NULL, NULL); | |
4d673da1 DH |
461 | } |
462 | ||
08e0e7c8 | 463 | if (IS_ERR(inode)) |
dde194a6 | 464 | return PTR_ERR(inode); |
1da177e4 | 465 | |
13fcc683 | 466 | if (ctx->autocell || as->dyn_root) |
bec5eb61 | 467 | set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags); |
468 | ||
1da177e4 | 469 | ret = -ENOMEM; |
48fde701 AV |
470 | sb->s_root = d_make_root(inode); |
471 | if (!sb->s_root) | |
1da177e4 LT |
472 | goto error; |
473 | ||
0da0b7fd | 474 | if (as->dyn_root) { |
66c7e1d3 | 475 | sb->s_d_op = &afs_dynroot_dentry_operations; |
0da0b7fd DH |
476 | ret = afs_dynroot_populate(sb); |
477 | if (ret < 0) | |
478 | goto error; | |
479 | } else { | |
66c7e1d3 | 480 | sb->s_d_op = &afs_fs_dentry_operations; |
0da0b7fd | 481 | } |
1da177e4 | 482 | |
08e0e7c8 | 483 | _leave(" = 0"); |
1da177e4 LT |
484 | return 0; |
485 | ||
ec26815a | 486 | error: |
08e0e7c8 | 487 | _leave(" = %d", ret); |
1da177e4 | 488 | return ret; |
ec26815a | 489 | } |
1da177e4 | 490 | |
13fcc683 | 491 | static struct afs_super_info *afs_alloc_sbi(struct fs_context *fc) |
49566f6f | 492 | { |
13fcc683 | 493 | struct afs_fs_context *ctx = fc->fs_private; |
49566f6f DH |
494 | struct afs_super_info *as; |
495 | ||
496 | as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL); | |
497 | if (as) { | |
13fcc683 | 498 | as->net_ns = get_net(fc->net_ns); |
6c6c1d63 | 499 | as->flock_mode = ctx->flock_mode; |
13fcc683 | 500 | if (ctx->dyn_root) { |
4d673da1 | 501 | as->dyn_root = true; |
13fcc683 DH |
502 | } else { |
503 | as->cell = afs_get_cell(ctx->cell); | |
504 | as->volume = __afs_get_volume(ctx->volume); | |
505 | } | |
49566f6f DH |
506 | } |
507 | return as; | |
508 | } | |
509 | ||
510 | static void afs_destroy_sbi(struct afs_super_info *as) | |
511 | { | |
512 | if (as) { | |
9ed900b1 | 513 | afs_put_volume(as->cell, as->volume); |
5b86d4ff DH |
514 | afs_put_cell(afs_net(as->net_ns), as->cell); |
515 | put_net(as->net_ns); | |
49566f6f DH |
516 | kfree(as); |
517 | } | |
518 | } | |
519 | ||
0da0b7fd DH |
520 | static void afs_kill_super(struct super_block *sb) |
521 | { | |
522 | struct afs_super_info *as = AFS_FS_S(sb); | |
523 | struct afs_net *net = afs_net(as->net_ns); | |
524 | ||
525 | if (as->dyn_root) | |
526 | afs_dynroot_depopulate(sb); | |
13fcc683 | 527 | |
0da0b7fd DH |
528 | /* Clear the callback interests (which will do ilookup5) before |
529 | * deactivating the superblock. | |
530 | */ | |
531 | if (as->volume) | |
532 | afs_clear_callback_interests(net, as->volume->servers); | |
533 | kill_anon_super(sb); | |
534 | if (as->volume) | |
535 | afs_deactivate_volume(as->volume); | |
536 | afs_destroy_sbi(as); | |
537 | } | |
538 | ||
1da177e4 | 539 | /* |
13fcc683 | 540 | * Get an AFS superblock and root directory. |
1da177e4 | 541 | */ |
13fcc683 | 542 | static int afs_get_tree(struct fs_context *fc) |
1da177e4 | 543 | { |
13fcc683 | 544 | struct afs_fs_context *ctx = fc->fs_private; |
1da177e4 | 545 | struct super_block *sb; |
dde194a6 | 546 | struct afs_super_info *as; |
1da177e4 LT |
547 | int ret; |
548 | ||
13fcc683 DH |
549 | ret = afs_validate_fc(fc); |
550 | if (ret) | |
f74f70f8 | 551 | goto error; |
00d3b7a4 | 552 | |
13fcc683 | 553 | _enter(""); |
00d3b7a4 | 554 | |
49566f6f DH |
555 | /* allocate a superblock info record */ |
556 | ret = -ENOMEM; | |
13fcc683 | 557 | as = afs_alloc_sbi(fc); |
49566f6f | 558 | if (!as) |
13fcc683 DH |
559 | goto error; |
560 | fc->s_fs_info = as; | |
1da177e4 LT |
561 | |
562 | /* allocate a deviceless superblock */ | |
13fcc683 DH |
563 | sb = sget_fc(fc, |
564 | as->dyn_root ? afs_dynroot_test_super : afs_test_super, | |
565 | afs_set_super); | |
08e0e7c8 DH |
566 | if (IS_ERR(sb)) { |
567 | ret = PTR_ERR(sb); | |
13fcc683 | 568 | goto error; |
08e0e7c8 | 569 | } |
1da177e4 | 570 | |
436058a4 DH |
571 | if (!sb->s_root) { |
572 | /* initial superblock/root creation */ | |
573 | _debug("create"); | |
13fcc683 | 574 | ret = afs_fill_super(sb, ctx); |
f044c884 DH |
575 | if (ret < 0) |
576 | goto error_sb; | |
1751e8a6 | 577 | sb->s_flags |= SB_ACTIVE; |
436058a4 DH |
578 | } else { |
579 | _debug("reuse"); | |
1751e8a6 | 580 | ASSERTCMP(sb->s_flags, &, SB_ACTIVE); |
1da177e4 | 581 | } |
1da177e4 | 582 | |
13fcc683 | 583 | fc->root = dget(sb->s_root); |
80548b03 | 584 | trace_afs_get_tree(as->cell, as->volume); |
08e0e7c8 | 585 | _leave(" = 0 [%p]", sb); |
13fcc683 | 586 | return 0; |
1da177e4 | 587 | |
f044c884 DH |
588 | error_sb: |
589 | deactivate_locked_super(sb); | |
ec26815a | 590 | error: |
1da177e4 | 591 | _leave(" = %d", ret); |
13fcc683 DH |
592 | return ret; |
593 | } | |
594 | ||
595 | static void afs_free_fc(struct fs_context *fc) | |
596 | { | |
597 | struct afs_fs_context *ctx = fc->fs_private; | |
598 | ||
599 | afs_destroy_sbi(fc->s_fs_info); | |
600 | afs_put_volume(ctx->cell, ctx->volume); | |
601 | afs_put_cell(ctx->net, ctx->cell); | |
602 | key_put(ctx->key); | |
603 | kfree(ctx); | |
604 | } | |
605 | ||
606 | static const struct fs_context_operations afs_context_ops = { | |
607 | .free = afs_free_fc, | |
608 | .parse_param = afs_parse_param, | |
609 | .get_tree = afs_get_tree, | |
610 | }; | |
611 | ||
612 | /* | |
613 | * Set up the filesystem mount context. | |
614 | */ | |
615 | static int afs_init_fs_context(struct fs_context *fc) | |
616 | { | |
617 | struct afs_fs_context *ctx; | |
618 | struct afs_cell *cell; | |
619 | ||
13fcc683 DH |
620 | ctx = kzalloc(sizeof(struct afs_fs_context), GFP_KERNEL); |
621 | if (!ctx) | |
622 | return -ENOMEM; | |
623 | ||
624 | ctx->type = AFSVL_ROVOL; | |
625 | ctx->net = afs_net(fc->net_ns); | |
626 | ||
627 | /* Default to the workstation cell. */ | |
628 | rcu_read_lock(); | |
629 | cell = afs_lookup_cell_rcu(ctx->net, NULL, 0); | |
630 | rcu_read_unlock(); | |
631 | if (IS_ERR(cell)) | |
632 | cell = NULL; | |
633 | ctx->cell = cell; | |
634 | ||
635 | fc->fs_private = ctx; | |
636 | fc->ops = &afs_context_ops; | |
637 | return 0; | |
ec26815a | 638 | } |
1da177e4 | 639 | |
1da177e4 | 640 | /* |
f8de483e DH |
641 | * Initialise an inode cache slab element prior to any use. Note that |
642 | * afs_alloc_inode() *must* reset anything that could incorrectly leak from one | |
643 | * inode to another. | |
1da177e4 | 644 | */ |
51cc5068 | 645 | static void afs_i_init_once(void *_vnode) |
1da177e4 | 646 | { |
ec26815a | 647 | struct afs_vnode *vnode = _vnode; |
1da177e4 | 648 | |
a35afb83 CL |
649 | memset(vnode, 0, sizeof(*vnode)); |
650 | inode_init_once(&vnode->vfs_inode); | |
d2ddc776 | 651 | mutex_init(&vnode->io_lock); |
b61f7dcf | 652 | init_rwsem(&vnode->validate_lock); |
4343d008 | 653 | spin_lock_init(&vnode->wb_lock); |
a35afb83 | 654 | spin_lock_init(&vnode->lock); |
4343d008 | 655 | INIT_LIST_HEAD(&vnode->wb_keys); |
e8d6c554 DH |
656 | INIT_LIST_HEAD(&vnode->pending_locks); |
657 | INIT_LIST_HEAD(&vnode->granted_locks); | |
658 | INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work); | |
c435ee34 | 659 | seqlock_init(&vnode->cb_lock); |
ec26815a | 660 | } |
1da177e4 | 661 | |
1da177e4 LT |
662 | /* |
663 | * allocate an AFS inode struct from our slab cache | |
664 | */ | |
665 | static struct inode *afs_alloc_inode(struct super_block *sb) | |
666 | { | |
667 | struct afs_vnode *vnode; | |
668 | ||
ec26815a | 669 | vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
670 | if (!vnode) |
671 | return NULL; | |
672 | ||
673 | atomic_inc(&afs_count_active_inodes); | |
674 | ||
f8de483e | 675 | /* Reset anything that shouldn't leak from one inode to the next. */ |
1da177e4 LT |
676 | memset(&vnode->fid, 0, sizeof(vnode->fid)); |
677 | memset(&vnode->status, 0, sizeof(vnode->status)); | |
678 | ||
679 | vnode->volume = NULL; | |
f8de483e DH |
680 | vnode->lock_key = NULL; |
681 | vnode->permit_cache = NULL; | |
f642404a | 682 | RCU_INIT_POINTER(vnode->cb_interest, NULL); |
f8de483e DH |
683 | #ifdef CONFIG_AFS_FSCACHE |
684 | vnode->cache = NULL; | |
685 | #endif | |
686 | ||
260a9803 | 687 | vnode->flags = 1 << AFS_VNODE_UNSET; |
f8de483e | 688 | vnode->lock_state = AFS_VNODE_LOCK_NONE; |
1da177e4 | 689 | |
79ddbfa5 DH |
690 | init_rwsem(&vnode->rmdir_lock); |
691 | ||
0f300ca9 | 692 | _leave(" = %p", &vnode->vfs_inode); |
1da177e4 | 693 | return &vnode->vfs_inode; |
ec26815a | 694 | } |
1da177e4 | 695 | |
51b9fe48 | 696 | static void afs_free_inode(struct inode *inode) |
fa0d7e3d | 697 | { |
51b9fe48 | 698 | kmem_cache_free(afs_inode_cachep, AFS_FS_I(inode)); |
fa0d7e3d NP |
699 | } |
700 | ||
1da177e4 LT |
701 | /* |
702 | * destroy an AFS inode struct | |
703 | */ | |
704 | static void afs_destroy_inode(struct inode *inode) | |
705 | { | |
08e0e7c8 DH |
706 | struct afs_vnode *vnode = AFS_FS_I(inode); |
707 | ||
3b6492df | 708 | _enter("%p{%llx:%llu}", inode, vnode->fid.vid, vnode->fid.vnode); |
1da177e4 | 709 | |
08e0e7c8 DH |
710 | _debug("DESTROY INODE %p", inode); |
711 | ||
f642404a | 712 | ASSERTCMP(rcu_access_pointer(vnode->cb_interest), ==, NULL); |
08e0e7c8 | 713 | |
1da177e4 | 714 | atomic_dec(&afs_count_active_inodes); |
ec26815a | 715 | } |
45222b9e DH |
716 | |
717 | /* | |
718 | * return information about an AFS volume | |
719 | */ | |
720 | static int afs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
721 | { | |
4d673da1 | 722 | struct afs_super_info *as = AFS_FS_S(dentry->d_sb); |
d2ddc776 | 723 | struct afs_fs_cursor fc; |
45222b9e | 724 | struct afs_volume_status vs; |
2b0143b5 | 725 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); |
45222b9e DH |
726 | struct key *key; |
727 | int ret; | |
728 | ||
4d673da1 DH |
729 | buf->f_type = dentry->d_sb->s_magic; |
730 | buf->f_bsize = AFS_BLOCK_SIZE; | |
731 | buf->f_namelen = AFSNAMEMAX - 1; | |
732 | ||
733 | if (as->dyn_root) { | |
734 | buf->f_blocks = 1; | |
735 | buf->f_bavail = 0; | |
736 | buf->f_bfree = 0; | |
737 | return 0; | |
738 | } | |
66c7e1d3 | 739 | |
45222b9e DH |
740 | key = afs_request_key(vnode->volume->cell); |
741 | if (IS_ERR(key)) | |
742 | return PTR_ERR(key); | |
743 | ||
d2ddc776 | 744 | ret = -ERESTARTSYS; |
20b8391f | 745 | if (afs_begin_vnode_operation(&fc, vnode, key, true)) { |
d2ddc776 DH |
746 | fc.flags |= AFS_FS_CURSOR_NO_VSLEEP; |
747 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 748 | fc.cb_break = afs_calc_vnode_cb_break(vnode); |
d2ddc776 DH |
749 | afs_fs_get_volume_status(&fc, &vs); |
750 | } | |
751 | ||
752 | afs_check_for_remote_deletion(&fc, fc.vnode); | |
d2ddc776 | 753 | ret = afs_end_vnode_operation(&fc); |
45222b9e DH |
754 | } |
755 | ||
d2ddc776 | 756 | key_put(key); |
45222b9e | 757 | |
d2ddc776 | 758 | if (ret == 0) { |
d2ddc776 DH |
759 | if (vs.max_quota == 0) |
760 | buf->f_blocks = vs.part_max_blocks; | |
761 | else | |
762 | buf->f_blocks = vs.max_quota; | |
763 | buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use; | |
764 | } | |
765 | ||
766 | return ret; | |
45222b9e | 767 | } |