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 | 40 | static int afs_init_fs_context(struct fs_context *fc); |
d7167b14 | 41 | static const struct fs_parameter_spec 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, | |
d7167b14 | 47 | .parameters = afs_fs_parameters, |
13fcc683 | 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 | ||
5eede625 | 76 | static const struct constant_table afs_param_flock[] = { |
2710c957 AV |
77 | {"local", afs_flock_mode_local }, |
78 | {"openafs", afs_flock_mode_openafs }, | |
79 | {"strict", afs_flock_mode_strict }, | |
80 | {"write", afs_flock_mode_write }, | |
81 | {} | |
82 | }; | |
83 | ||
d7167b14 | 84 | static const struct fs_parameter_spec afs_fs_parameters[] = { |
13fcc683 | 85 | fsparam_flag ("autocell", Opt_autocell), |
13fcc683 | 86 | fsparam_flag ("dyn", Opt_dyn), |
2710c957 | 87 | fsparam_enum ("flock", Opt_flock, afs_param_flock), |
13fcc683 | 88 | fsparam_string("source", Opt_source), |
13fcc683 DH |
89 | {} |
90 | }; | |
91 | ||
1da177e4 LT |
92 | /* |
93 | * initialise the filesystem | |
94 | */ | |
95 | int __init afs_fs_init(void) | |
96 | { | |
97 | int ret; | |
98 | ||
99 | _enter(""); | |
100 | ||
1da177e4 LT |
101 | /* create ourselves an inode cache */ |
102 | atomic_set(&afs_count_active_inodes, 0); | |
103 | ||
104 | ret = -ENOMEM; | |
105 | afs_inode_cachep = kmem_cache_create("afs_inode_cache", | |
106 | sizeof(struct afs_vnode), | |
107 | 0, | |
5d097056 | 108 | SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, |
20c2df83 | 109 | afs_i_init_once); |
1da177e4 LT |
110 | if (!afs_inode_cachep) { |
111 | printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n"); | |
112 | return ret; | |
113 | } | |
114 | ||
115 | /* now export our filesystem to lesser mortals */ | |
116 | ret = register_filesystem(&afs_fs_type); | |
117 | if (ret < 0) { | |
118 | kmem_cache_destroy(afs_inode_cachep); | |
08e0e7c8 | 119 | _leave(" = %d", ret); |
1da177e4 LT |
120 | return ret; |
121 | } | |
122 | ||
08e0e7c8 | 123 | _leave(" = 0"); |
1da177e4 | 124 | return 0; |
ec26815a | 125 | } |
1da177e4 | 126 | |
1da177e4 LT |
127 | /* |
128 | * clean up the filesystem | |
129 | */ | |
5b86d4ff | 130 | void afs_fs_exit(void) |
1da177e4 | 131 | { |
08e0e7c8 DH |
132 | _enter(""); |
133 | ||
134 | afs_mntpt_kill_timer(); | |
1da177e4 LT |
135 | unregister_filesystem(&afs_fs_type); |
136 | ||
137 | if (atomic_read(&afs_count_active_inodes) != 0) { | |
138 | printk("kAFS: %d active inode objects still present\n", | |
139 | atomic_read(&afs_count_active_inodes)); | |
140 | BUG(); | |
141 | } | |
142 | ||
8c0a8537 KS |
143 | /* |
144 | * Make sure all delayed rcu free inodes are flushed before we | |
145 | * destroy cache. | |
146 | */ | |
147 | rcu_barrier(); | |
1da177e4 | 148 | kmem_cache_destroy(afs_inode_cachep); |
08e0e7c8 | 149 | _leave(""); |
ec26815a | 150 | } |
1da177e4 | 151 | |
677018a6 DH |
152 | /* |
153 | * Display the mount device name in /proc/mounts. | |
154 | */ | |
155 | static int afs_show_devname(struct seq_file *m, struct dentry *root) | |
156 | { | |
d2ddc776 | 157 | struct afs_super_info *as = AFS_FS_S(root->d_sb); |
677018a6 | 158 | struct afs_volume *volume = as->volume; |
d2ddc776 | 159 | struct afs_cell *cell = as->cell; |
677018a6 DH |
160 | const char *suf = ""; |
161 | char pref = '%'; | |
162 | ||
4d673da1 DH |
163 | if (as->dyn_root) { |
164 | seq_puts(m, "none"); | |
165 | return 0; | |
166 | } | |
66c7e1d3 | 167 | |
677018a6 DH |
168 | switch (volume->type) { |
169 | case AFSVL_RWVOL: | |
170 | break; | |
171 | case AFSVL_ROVOL: | |
172 | pref = '#'; | |
173 | if (volume->type_force) | |
174 | suf = ".readonly"; | |
175 | break; | |
176 | case AFSVL_BACKVOL: | |
177 | pref = '#'; | |
178 | suf = ".backup"; | |
179 | break; | |
180 | } | |
181 | ||
d2ddc776 | 182 | seq_printf(m, "%c%s:%s%s", pref, cell->name, volume->name, suf); |
677018a6 DH |
183 | return 0; |
184 | } | |
185 | ||
186 | /* | |
187 | * Display the mount options in /proc/mounts. | |
188 | */ | |
189 | static int afs_show_options(struct seq_file *m, struct dentry *root) | |
190 | { | |
4d673da1 | 191 | struct afs_super_info *as = AFS_FS_S(root->d_sb); |
6c6c1d63 | 192 | const char *p = NULL; |
4d673da1 DH |
193 | |
194 | if (as->dyn_root) | |
195 | seq_puts(m, ",dyn"); | |
677018a6 | 196 | if (test_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(d_inode(root))->flags)) |
4d673da1 | 197 | seq_puts(m, ",autocell"); |
6c6c1d63 DH |
198 | switch (as->flock_mode) { |
199 | case afs_flock_mode_unset: break; | |
200 | case afs_flock_mode_local: p = "local"; break; | |
201 | case afs_flock_mode_openafs: p = "openafs"; break; | |
202 | case afs_flock_mode_strict: p = "strict"; break; | |
203 | case afs_flock_mode_write: p = "write"; break; | |
204 | } | |
205 | if (p) | |
206 | seq_printf(m, ",flock=%s", p); | |
207 | ||
677018a6 DH |
208 | return 0; |
209 | } | |
210 | ||
1da177e4 | 211 | /* |
13fcc683 DH |
212 | * Parse the source name to get cell name, volume name, volume type and R/W |
213 | * selector. | |
214 | * | |
215 | * This can be one of the following: | |
00d3b7a4 | 216 | * "%[cell:]volume[.]" R/W volume |
c99c2171 DH |
217 | * "#[cell:]volume[.]" R/O or R/W volume (R/O parent), |
218 | * or R/W (R/W parent) volume | |
00d3b7a4 DH |
219 | * "%[cell:]volume.readonly" R/O volume |
220 | * "#[cell:]volume.readonly" R/O volume | |
221 | * "%[cell:]volume.backup" Backup volume | |
222 | * "#[cell:]volume.backup" Backup volume | |
223 | */ | |
13fcc683 | 224 | static int afs_parse_source(struct fs_context *fc, struct fs_parameter *param) |
00d3b7a4 | 225 | { |
13fcc683 | 226 | struct afs_fs_context *ctx = fc->fs_private; |
00d3b7a4 | 227 | struct afs_cell *cell; |
13fcc683 | 228 | const char *cellname, *suffix, *name = param->string; |
00d3b7a4 DH |
229 | int cellnamesz; |
230 | ||
231 | _enter(",%s", name); | |
66c7e1d3 | 232 | |
4cb68296 DH |
233 | if (fc->source) |
234 | return invalf(fc, "kAFS: Multiple sources not supported"); | |
235 | ||
00d3b7a4 DH |
236 | if (!name) { |
237 | printk(KERN_ERR "kAFS: no volume name specified\n"); | |
238 | return -EINVAL; | |
239 | } | |
240 | ||
241 | if ((name[0] != '%' && name[0] != '#') || !name[1]) { | |
13fcc683 DH |
242 | /* To use dynroot, we don't want to have to provide a source */ |
243 | if (strcmp(name, "none") == 0) { | |
244 | ctx->no_cell = true; | |
245 | return 0; | |
246 | } | |
00d3b7a4 DH |
247 | printk(KERN_ERR "kAFS: unparsable volume name\n"); |
248 | return -EINVAL; | |
249 | } | |
250 | ||
251 | /* determine the type of volume we're looking for */ | |
c99c2171 | 252 | if (name[0] == '%') { |
13fcc683 DH |
253 | ctx->type = AFSVL_RWVOL; |
254 | ctx->force = true; | |
00d3b7a4 DH |
255 | } |
256 | name++; | |
257 | ||
258 | /* split the cell name out if there is one */ | |
13fcc683 DH |
259 | ctx->volname = strchr(name, ':'); |
260 | if (ctx->volname) { | |
00d3b7a4 | 261 | cellname = name; |
13fcc683 DH |
262 | cellnamesz = ctx->volname - name; |
263 | ctx->volname++; | |
00d3b7a4 | 264 | } else { |
13fcc683 | 265 | ctx->volname = name; |
00d3b7a4 DH |
266 | cellname = NULL; |
267 | cellnamesz = 0; | |
268 | } | |
269 | ||
270 | /* the volume type is further affected by a possible suffix */ | |
13fcc683 | 271 | suffix = strrchr(ctx->volname, '.'); |
00d3b7a4 DH |
272 | if (suffix) { |
273 | if (strcmp(suffix, ".readonly") == 0) { | |
13fcc683 DH |
274 | ctx->type = AFSVL_ROVOL; |
275 | ctx->force = true; | |
00d3b7a4 | 276 | } else if (strcmp(suffix, ".backup") == 0) { |
13fcc683 DH |
277 | ctx->type = AFSVL_BACKVOL; |
278 | ctx->force = true; | |
00d3b7a4 DH |
279 | } else if (suffix[1] == 0) { |
280 | } else { | |
281 | suffix = NULL; | |
282 | } | |
283 | } | |
284 | ||
13fcc683 DH |
285 | ctx->volnamesz = suffix ? |
286 | suffix - ctx->volname : strlen(ctx->volname); | |
00d3b7a4 DH |
287 | |
288 | _debug("cell %*.*s [%p]", | |
13fcc683 | 289 | cellnamesz, cellnamesz, cellname ?: "", ctx->cell); |
00d3b7a4 DH |
290 | |
291 | /* lookup the cell record */ | |
13fcc683 DH |
292 | if (cellname) { |
293 | cell = afs_lookup_cell(ctx->net, cellname, cellnamesz, | |
989782dc | 294 | NULL, false); |
00d3b7a4 | 295 | if (IS_ERR(cell)) { |
13fcc683 | 296 | pr_err("kAFS: unable to lookup cell '%*.*s'\n", |
bec5eb61 | 297 | cellnamesz, cellnamesz, cellname ?: ""); |
00d3b7a4 DH |
298 | return PTR_ERR(cell); |
299 | } | |
dca54a7b DH |
300 | afs_unuse_cell(ctx->net, ctx->cell, afs_cell_trace_unuse_parse); |
301 | afs_see_cell(cell, afs_cell_trace_see_source); | |
13fcc683 | 302 | ctx->cell = cell; |
00d3b7a4 DH |
303 | } |
304 | ||
305 | _debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s", | |
13fcc683 DH |
306 | ctx->cell->name, ctx->cell, |
307 | ctx->volnamesz, ctx->volnamesz, ctx->volname, | |
308 | suffix ?: "-", ctx->type, ctx->force ? " FORCE" : ""); | |
309 | ||
310 | fc->source = param->string; | |
311 | param->string = NULL; | |
312 | return 0; | |
313 | } | |
314 | ||
315 | /* | |
316 | * Parse a single mount parameter. | |
317 | */ | |
318 | static int afs_parse_param(struct fs_context *fc, struct fs_parameter *param) | |
319 | { | |
320 | struct fs_parse_result result; | |
321 | struct afs_fs_context *ctx = fc->fs_private; | |
13fcc683 DH |
322 | int opt; |
323 | ||
d7167b14 | 324 | opt = fs_parse(fc, afs_fs_parameters, param, &result); |
13fcc683 DH |
325 | if (opt < 0) |
326 | return opt; | |
327 | ||
328 | switch (opt) { | |
13fcc683 DH |
329 | case Opt_source: |
330 | return afs_parse_source(fc, param); | |
331 | ||
332 | case Opt_autocell: | |
333 | ctx->autocell = true; | |
334 | break; | |
335 | ||
336 | case Opt_dyn: | |
337 | ctx->dyn_root = true; | |
338 | break; | |
339 | ||
6c6c1d63 DH |
340 | case Opt_flock: |
341 | ctx->flock_mode = result.uint_32; | |
342 | break; | |
343 | ||
13fcc683 DH |
344 | default: |
345 | return -EINVAL; | |
346 | } | |
347 | ||
348 | _leave(" = 0"); | |
349 | return 0; | |
350 | } | |
351 | ||
352 | /* | |
353 | * Validate the options, get the cell key and look up the volume. | |
354 | */ | |
355 | static int afs_validate_fc(struct fs_context *fc) | |
356 | { | |
357 | struct afs_fs_context *ctx = fc->fs_private; | |
358 | struct afs_volume *volume; | |
8a070a96 | 359 | struct afs_cell *cell; |
13fcc683 | 360 | struct key *key; |
8a070a96 | 361 | int ret; |
13fcc683 DH |
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 | ||
8a070a96 | 374 | reget_key: |
13fcc683 DH |
375 | /* We try to do the mount securely. */ |
376 | key = afs_request_key(ctx->cell); | |
377 | if (IS_ERR(key)) | |
378 | return PTR_ERR(key); | |
379 | ||
380 | ctx->key = key; | |
381 | ||
382 | if (ctx->volume) { | |
cca37d45 DH |
383 | afs_put_volume(ctx->net, ctx->volume, |
384 | afs_volume_trace_put_validate_fc); | |
13fcc683 DH |
385 | ctx->volume = NULL; |
386 | } | |
387 | ||
8a070a96 DH |
388 | if (test_bit(AFS_CELL_FL_CHECK_ALIAS, &ctx->cell->flags)) { |
389 | ret = afs_cell_detect_alias(ctx->cell, key); | |
390 | if (ret < 0) | |
391 | return ret; | |
392 | if (ret == 1) { | |
393 | _debug("switch to alias"); | |
394 | key_put(ctx->key); | |
395 | ctx->key = NULL; | |
dca54a7b DH |
396 | cell = afs_use_cell(ctx->cell->alias_of, |
397 | afs_cell_trace_use_fc_alias); | |
398 | afs_unuse_cell(ctx->net, ctx->cell, afs_cell_trace_unuse_fc); | |
8a070a96 DH |
399 | ctx->cell = cell; |
400 | goto reget_key; | |
401 | } | |
402 | } | |
403 | ||
13fcc683 DH |
404 | volume = afs_create_volume(ctx); |
405 | if (IS_ERR(volume)) | |
406 | return PTR_ERR(volume); | |
407 | ||
408 | ctx->volume = volume; | |
409 | } | |
00d3b7a4 DH |
410 | |
411 | return 0; | |
412 | } | |
413 | ||
1da177e4 LT |
414 | /* |
415 | * check a superblock to see if it's the one we're looking for | |
416 | */ | |
13fcc683 | 417 | static int afs_test_super(struct super_block *sb, struct fs_context *fc) |
1da177e4 | 418 | { |
13fcc683 | 419 | struct afs_fs_context *ctx = fc->fs_private; |
d2ddc776 | 420 | struct afs_super_info *as = AFS_FS_S(sb); |
1da177e4 | 421 | |
13fcc683 | 422 | return (as->net_ns == fc->net_ns && |
4d673da1 | 423 | as->volume && |
13fcc683 | 424 | as->volume->vid == ctx->volume->vid && |
106bc798 | 425 | as->cell == ctx->cell && |
0da0b7fd | 426 | !as->dyn_root); |
4d673da1 DH |
427 | } |
428 | ||
13fcc683 | 429 | static int afs_dynroot_test_super(struct super_block *sb, struct fs_context *fc) |
4d673da1 | 430 | { |
0da0b7fd DH |
431 | struct afs_super_info *as = AFS_FS_S(sb); |
432 | ||
13fcc683 | 433 | return (as->net_ns == fc->net_ns && |
0da0b7fd | 434 | as->dyn_root); |
dde194a6 AV |
435 | } |
436 | ||
13fcc683 | 437 | static int afs_set_super(struct super_block *sb, struct fs_context *fc) |
dde194a6 | 438 | { |
dde194a6 | 439 | return set_anon_super(sb, NULL); |
ec26815a | 440 | } |
1da177e4 | 441 | |
1da177e4 LT |
442 | /* |
443 | * fill in the superblock | |
444 | */ | |
13fcc683 | 445 | static int afs_fill_super(struct super_block *sb, struct afs_fs_context *ctx) |
1da177e4 | 446 | { |
d2ddc776 | 447 | struct afs_super_info *as = AFS_FS_S(sb); |
1da177e4 LT |
448 | struct inode *inode = NULL; |
449 | int ret; | |
450 | ||
08e0e7c8 | 451 | _enter(""); |
1da177e4 | 452 | |
1da177e4 | 453 | /* fill in the superblock */ |
09cbfeaf KS |
454 | sb->s_blocksize = PAGE_SIZE; |
455 | sb->s_blocksize_bits = PAGE_SHIFT; | |
b485275f | 456 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
1da177e4 LT |
457 | sb->s_magic = AFS_FS_MAGIC; |
458 | sb->s_op = &afs_super_ops; | |
4d673da1 DH |
459 | if (!as->dyn_root) |
460 | sb->s_xattr = afs_xattr_handlers; | |
edd3ba94 JK |
461 | ret = super_setup_bdi(sb); |
462 | if (ret) | |
463 | return ret; | |
1da177e4 LT |
464 | |
465 | /* allocate the root inode and dentry */ | |
4d673da1 DH |
466 | if (as->dyn_root) { |
467 | inode = afs_iget_pseudo_dir(sb, true); | |
4d673da1 | 468 | } else { |
3b6492df | 469 | sprintf(sb->s_id, "%llu", as->volume->vid); |
4d673da1 | 470 | afs_activate_volume(as->volume); |
e49c7b2f | 471 | inode = afs_root_iget(sb, ctx->key); |
4d673da1 DH |
472 | } |
473 | ||
08e0e7c8 | 474 | if (IS_ERR(inode)) |
dde194a6 | 475 | return PTR_ERR(inode); |
1da177e4 | 476 | |
13fcc683 | 477 | if (ctx->autocell || as->dyn_root) |
bec5eb61 | 478 | set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags); |
479 | ||
1da177e4 | 480 | ret = -ENOMEM; |
48fde701 AV |
481 | sb->s_root = d_make_root(inode); |
482 | if (!sb->s_root) | |
1da177e4 LT |
483 | goto error; |
484 | ||
0da0b7fd | 485 | if (as->dyn_root) { |
66c7e1d3 | 486 | sb->s_d_op = &afs_dynroot_dentry_operations; |
0da0b7fd DH |
487 | ret = afs_dynroot_populate(sb); |
488 | if (ret < 0) | |
489 | goto error; | |
490 | } else { | |
66c7e1d3 | 491 | sb->s_d_op = &afs_fs_dentry_operations; |
20325960 | 492 | rcu_assign_pointer(as->volume->sb, sb); |
0da0b7fd | 493 | } |
1da177e4 | 494 | |
08e0e7c8 | 495 | _leave(" = 0"); |
1da177e4 LT |
496 | return 0; |
497 | ||
ec26815a | 498 | error: |
08e0e7c8 | 499 | _leave(" = %d", ret); |
1da177e4 | 500 | return ret; |
ec26815a | 501 | } |
1da177e4 | 502 | |
13fcc683 | 503 | static struct afs_super_info *afs_alloc_sbi(struct fs_context *fc) |
49566f6f | 504 | { |
13fcc683 | 505 | struct afs_fs_context *ctx = fc->fs_private; |
49566f6f DH |
506 | struct afs_super_info *as; |
507 | ||
508 | as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL); | |
509 | if (as) { | |
13fcc683 | 510 | as->net_ns = get_net(fc->net_ns); |
6c6c1d63 | 511 | as->flock_mode = ctx->flock_mode; |
13fcc683 | 512 | if (ctx->dyn_root) { |
4d673da1 | 513 | as->dyn_root = true; |
13fcc683 | 514 | } else { |
dca54a7b | 515 | as->cell = afs_use_cell(ctx->cell, afs_cell_trace_use_sbi); |
cca37d45 DH |
516 | as->volume = afs_get_volume(ctx->volume, |
517 | afs_volume_trace_get_alloc_sbi); | |
13fcc683 | 518 | } |
49566f6f DH |
519 | } |
520 | return as; | |
521 | } | |
522 | ||
523 | static void afs_destroy_sbi(struct afs_super_info *as) | |
524 | { | |
525 | if (as) { | |
e49c7b2f | 526 | struct afs_net *net = afs_net(as->net_ns); |
cca37d45 | 527 | afs_put_volume(net, as->volume, afs_volume_trace_put_destroy_sbi); |
dca54a7b | 528 | afs_unuse_cell(net, as->cell, afs_cell_trace_unuse_sbi); |
5b86d4ff | 529 | put_net(as->net_ns); |
49566f6f DH |
530 | kfree(as); |
531 | } | |
532 | } | |
533 | ||
0da0b7fd DH |
534 | static void afs_kill_super(struct super_block *sb) |
535 | { | |
536 | struct afs_super_info *as = AFS_FS_S(sb); | |
0da0b7fd DH |
537 | |
538 | if (as->dyn_root) | |
539 | afs_dynroot_depopulate(sb); | |
13fcc683 | 540 | |
0da0b7fd DH |
541 | /* Clear the callback interests (which will do ilookup5) before |
542 | * deactivating the superblock. | |
543 | */ | |
544 | if (as->volume) | |
20325960 | 545 | rcu_assign_pointer(as->volume->sb, NULL); |
0da0b7fd DH |
546 | kill_anon_super(sb); |
547 | if (as->volume) | |
548 | afs_deactivate_volume(as->volume); | |
549 | afs_destroy_sbi(as); | |
550 | } | |
551 | ||
1da177e4 | 552 | /* |
13fcc683 | 553 | * Get an AFS superblock and root directory. |
1da177e4 | 554 | */ |
13fcc683 | 555 | static int afs_get_tree(struct fs_context *fc) |
1da177e4 | 556 | { |
13fcc683 | 557 | struct afs_fs_context *ctx = fc->fs_private; |
1da177e4 | 558 | struct super_block *sb; |
dde194a6 | 559 | struct afs_super_info *as; |
1da177e4 LT |
560 | int ret; |
561 | ||
13fcc683 DH |
562 | ret = afs_validate_fc(fc); |
563 | if (ret) | |
f74f70f8 | 564 | goto error; |
00d3b7a4 | 565 | |
13fcc683 | 566 | _enter(""); |
00d3b7a4 | 567 | |
49566f6f DH |
568 | /* allocate a superblock info record */ |
569 | ret = -ENOMEM; | |
13fcc683 | 570 | as = afs_alloc_sbi(fc); |
49566f6f | 571 | if (!as) |
13fcc683 DH |
572 | goto error; |
573 | fc->s_fs_info = as; | |
1da177e4 LT |
574 | |
575 | /* allocate a deviceless superblock */ | |
13fcc683 DH |
576 | sb = sget_fc(fc, |
577 | as->dyn_root ? afs_dynroot_test_super : afs_test_super, | |
578 | afs_set_super); | |
08e0e7c8 DH |
579 | if (IS_ERR(sb)) { |
580 | ret = PTR_ERR(sb); | |
13fcc683 | 581 | goto error; |
08e0e7c8 | 582 | } |
1da177e4 | 583 | |
436058a4 DH |
584 | if (!sb->s_root) { |
585 | /* initial superblock/root creation */ | |
586 | _debug("create"); | |
13fcc683 | 587 | ret = afs_fill_super(sb, ctx); |
f044c884 DH |
588 | if (ret < 0) |
589 | goto error_sb; | |
1751e8a6 | 590 | sb->s_flags |= SB_ACTIVE; |
436058a4 DH |
591 | } else { |
592 | _debug("reuse"); | |
1751e8a6 | 593 | ASSERTCMP(sb->s_flags, &, SB_ACTIVE); |
1da177e4 | 594 | } |
1da177e4 | 595 | |
13fcc683 | 596 | fc->root = dget(sb->s_root); |
80548b03 | 597 | trace_afs_get_tree(as->cell, as->volume); |
08e0e7c8 | 598 | _leave(" = 0 [%p]", sb); |
13fcc683 | 599 | return 0; |
1da177e4 | 600 | |
f044c884 DH |
601 | error_sb: |
602 | deactivate_locked_super(sb); | |
ec26815a | 603 | error: |
1da177e4 | 604 | _leave(" = %d", ret); |
13fcc683 DH |
605 | return ret; |
606 | } | |
607 | ||
608 | static void afs_free_fc(struct fs_context *fc) | |
609 | { | |
610 | struct afs_fs_context *ctx = fc->fs_private; | |
611 | ||
612 | afs_destroy_sbi(fc->s_fs_info); | |
cca37d45 | 613 | afs_put_volume(ctx->net, ctx->volume, afs_volume_trace_put_free_fc); |
dca54a7b | 614 | afs_unuse_cell(ctx->net, ctx->cell, afs_cell_trace_unuse_fc); |
13fcc683 DH |
615 | key_put(ctx->key); |
616 | kfree(ctx); | |
617 | } | |
618 | ||
619 | static const struct fs_context_operations afs_context_ops = { | |
620 | .free = afs_free_fc, | |
621 | .parse_param = afs_parse_param, | |
622 | .get_tree = afs_get_tree, | |
623 | }; | |
624 | ||
625 | /* | |
626 | * Set up the filesystem mount context. | |
627 | */ | |
628 | static int afs_init_fs_context(struct fs_context *fc) | |
629 | { | |
630 | struct afs_fs_context *ctx; | |
631 | struct afs_cell *cell; | |
632 | ||
13fcc683 DH |
633 | ctx = kzalloc(sizeof(struct afs_fs_context), GFP_KERNEL); |
634 | if (!ctx) | |
635 | return -ENOMEM; | |
636 | ||
637 | ctx->type = AFSVL_ROVOL; | |
638 | ctx->net = afs_net(fc->net_ns); | |
639 | ||
640 | /* Default to the workstation cell. */ | |
dca54a7b | 641 | cell = afs_find_cell(ctx->net, NULL, 0, afs_cell_trace_use_fc); |
13fcc683 DH |
642 | if (IS_ERR(cell)) |
643 | cell = NULL; | |
644 | ctx->cell = cell; | |
645 | ||
646 | fc->fs_private = ctx; | |
647 | fc->ops = &afs_context_ops; | |
648 | return 0; | |
ec26815a | 649 | } |
1da177e4 | 650 | |
1da177e4 | 651 | /* |
f8de483e DH |
652 | * Initialise an inode cache slab element prior to any use. Note that |
653 | * afs_alloc_inode() *must* reset anything that could incorrectly leak from one | |
654 | * inode to another. | |
1da177e4 | 655 | */ |
51cc5068 | 656 | static void afs_i_init_once(void *_vnode) |
1da177e4 | 657 | { |
ec26815a | 658 | struct afs_vnode *vnode = _vnode; |
1da177e4 | 659 | |
a35afb83 CL |
660 | memset(vnode, 0, sizeof(*vnode)); |
661 | inode_init_once(&vnode->vfs_inode); | |
d2ddc776 | 662 | mutex_init(&vnode->io_lock); |
b61f7dcf | 663 | init_rwsem(&vnode->validate_lock); |
4343d008 | 664 | spin_lock_init(&vnode->wb_lock); |
a35afb83 | 665 | spin_lock_init(&vnode->lock); |
4343d008 | 666 | INIT_LIST_HEAD(&vnode->wb_keys); |
e8d6c554 DH |
667 | INIT_LIST_HEAD(&vnode->pending_locks); |
668 | INIT_LIST_HEAD(&vnode->granted_locks); | |
669 | INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work); | |
c435ee34 | 670 | seqlock_init(&vnode->cb_lock); |
ec26815a | 671 | } |
1da177e4 | 672 | |
1da177e4 LT |
673 | /* |
674 | * allocate an AFS inode struct from our slab cache | |
675 | */ | |
676 | static struct inode *afs_alloc_inode(struct super_block *sb) | |
677 | { | |
678 | struct afs_vnode *vnode; | |
679 | ||
ec26815a | 680 | vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
681 | if (!vnode) |
682 | return NULL; | |
683 | ||
684 | atomic_inc(&afs_count_active_inodes); | |
685 | ||
f8de483e | 686 | /* Reset anything that shouldn't leak from one inode to the next. */ |
1da177e4 LT |
687 | memset(&vnode->fid, 0, sizeof(vnode->fid)); |
688 | memset(&vnode->status, 0, sizeof(vnode->status)); | |
689 | ||
690 | vnode->volume = NULL; | |
f8de483e DH |
691 | vnode->lock_key = NULL; |
692 | vnode->permit_cache = NULL; | |
f8de483e DH |
693 | #ifdef CONFIG_AFS_FSCACHE |
694 | vnode->cache = NULL; | |
695 | #endif | |
696 | ||
260a9803 | 697 | vnode->flags = 1 << AFS_VNODE_UNSET; |
f8de483e | 698 | vnode->lock_state = AFS_VNODE_LOCK_NONE; |
1da177e4 | 699 | |
79ddbfa5 DH |
700 | init_rwsem(&vnode->rmdir_lock); |
701 | ||
0f300ca9 | 702 | _leave(" = %p", &vnode->vfs_inode); |
1da177e4 | 703 | return &vnode->vfs_inode; |
ec26815a | 704 | } |
1da177e4 | 705 | |
51b9fe48 | 706 | static void afs_free_inode(struct inode *inode) |
fa0d7e3d | 707 | { |
51b9fe48 | 708 | kmem_cache_free(afs_inode_cachep, AFS_FS_I(inode)); |
fa0d7e3d NP |
709 | } |
710 | ||
1da177e4 LT |
711 | /* |
712 | * destroy an AFS inode struct | |
713 | */ | |
714 | static void afs_destroy_inode(struct inode *inode) | |
715 | { | |
08e0e7c8 DH |
716 | struct afs_vnode *vnode = AFS_FS_I(inode); |
717 | ||
3b6492df | 718 | _enter("%p{%llx:%llu}", inode, vnode->fid.vid, vnode->fid.vnode); |
1da177e4 | 719 | |
08e0e7c8 DH |
720 | _debug("DESTROY INODE %p", inode); |
721 | ||
1da177e4 | 722 | atomic_dec(&afs_count_active_inodes); |
ec26815a | 723 | } |
45222b9e | 724 | |
e49c7b2f DH |
725 | static void afs_get_volume_status_success(struct afs_operation *op) |
726 | { | |
727 | struct afs_volume_status *vs = &op->volstatus.vs; | |
728 | struct kstatfs *buf = op->volstatus.buf; | |
729 | ||
730 | if (vs->max_quota == 0) | |
731 | buf->f_blocks = vs->part_max_blocks; | |
732 | else | |
733 | buf->f_blocks = vs->max_quota; | |
f11a016a DH |
734 | |
735 | if (buf->f_blocks > vs->blocks_in_use) | |
736 | buf->f_bavail = buf->f_bfree = | |
737 | buf->f_blocks - vs->blocks_in_use; | |
e49c7b2f DH |
738 | } |
739 | ||
740 | static const struct afs_operation_ops afs_get_volume_status_operation = { | |
741 | .issue_afs_rpc = afs_fs_get_volume_status, | |
742 | .issue_yfs_rpc = yfs_fs_get_volume_status, | |
743 | .success = afs_get_volume_status_success, | |
744 | }; | |
745 | ||
45222b9e DH |
746 | /* |
747 | * return information about an AFS volume | |
748 | */ | |
749 | static int afs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
750 | { | |
4d673da1 | 751 | struct afs_super_info *as = AFS_FS_S(dentry->d_sb); |
e49c7b2f | 752 | struct afs_operation *op; |
2b0143b5 | 753 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); |
45222b9e | 754 | |
4d673da1 DH |
755 | buf->f_type = dentry->d_sb->s_magic; |
756 | buf->f_bsize = AFS_BLOCK_SIZE; | |
757 | buf->f_namelen = AFSNAMEMAX - 1; | |
758 | ||
759 | if (as->dyn_root) { | |
760 | buf->f_blocks = 1; | |
761 | buf->f_bavail = 0; | |
762 | buf->f_bfree = 0; | |
763 | return 0; | |
764 | } | |
66c7e1d3 | 765 | |
e49c7b2f DH |
766 | op = afs_alloc_operation(NULL, as->volume); |
767 | if (IS_ERR(op)) | |
768 | return PTR_ERR(op); | |
45222b9e | 769 | |
e49c7b2f DH |
770 | afs_op_set_vnode(op, 0, vnode); |
771 | op->nr_files = 1; | |
772 | op->volstatus.buf = buf; | |
773 | op->ops = &afs_get_volume_status_operation; | |
774 | return afs_do_sync_operation(op); | |
45222b9e | 775 | } |