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Commit | Line | Data |
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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 | |
00d3b7a4 DH |
233 | if (!name) { |
234 | printk(KERN_ERR "kAFS: no volume name specified\n"); | |
235 | return -EINVAL; | |
236 | } | |
237 | ||
238 | if ((name[0] != '%' && name[0] != '#') || !name[1]) { | |
13fcc683 DH |
239 | /* To use dynroot, we don't want to have to provide a source */ |
240 | if (strcmp(name, "none") == 0) { | |
241 | ctx->no_cell = true; | |
242 | return 0; | |
243 | } | |
00d3b7a4 DH |
244 | printk(KERN_ERR "kAFS: unparsable volume name\n"); |
245 | return -EINVAL; | |
246 | } | |
247 | ||
248 | /* determine the type of volume we're looking for */ | |
c99c2171 | 249 | if (name[0] == '%') { |
13fcc683 DH |
250 | ctx->type = AFSVL_RWVOL; |
251 | ctx->force = true; | |
00d3b7a4 DH |
252 | } |
253 | name++; | |
254 | ||
255 | /* split the cell name out if there is one */ | |
13fcc683 DH |
256 | ctx->volname = strchr(name, ':'); |
257 | if (ctx->volname) { | |
00d3b7a4 | 258 | cellname = name; |
13fcc683 DH |
259 | cellnamesz = ctx->volname - name; |
260 | ctx->volname++; | |
00d3b7a4 | 261 | } else { |
13fcc683 | 262 | ctx->volname = name; |
00d3b7a4 DH |
263 | cellname = NULL; |
264 | cellnamesz = 0; | |
265 | } | |
266 | ||
267 | /* the volume type is further affected by a possible suffix */ | |
13fcc683 | 268 | suffix = strrchr(ctx->volname, '.'); |
00d3b7a4 DH |
269 | if (suffix) { |
270 | if (strcmp(suffix, ".readonly") == 0) { | |
13fcc683 DH |
271 | ctx->type = AFSVL_ROVOL; |
272 | ctx->force = true; | |
00d3b7a4 | 273 | } else if (strcmp(suffix, ".backup") == 0) { |
13fcc683 DH |
274 | ctx->type = AFSVL_BACKVOL; |
275 | ctx->force = true; | |
00d3b7a4 DH |
276 | } else if (suffix[1] == 0) { |
277 | } else { | |
278 | suffix = NULL; | |
279 | } | |
280 | } | |
281 | ||
13fcc683 DH |
282 | ctx->volnamesz = suffix ? |
283 | suffix - ctx->volname : strlen(ctx->volname); | |
00d3b7a4 DH |
284 | |
285 | _debug("cell %*.*s [%p]", | |
13fcc683 | 286 | cellnamesz, cellnamesz, cellname ?: "", ctx->cell); |
00d3b7a4 DH |
287 | |
288 | /* lookup the cell record */ | |
13fcc683 DH |
289 | if (cellname) { |
290 | cell = afs_lookup_cell(ctx->net, cellname, cellnamesz, | |
989782dc | 291 | NULL, false); |
00d3b7a4 | 292 | if (IS_ERR(cell)) { |
13fcc683 | 293 | pr_err("kAFS: unable to lookup cell '%*.*s'\n", |
bec5eb61 | 294 | cellnamesz, cellnamesz, cellname ?: ""); |
00d3b7a4 DH |
295 | return PTR_ERR(cell); |
296 | } | |
13fcc683 DH |
297 | afs_put_cell(ctx->net, ctx->cell); |
298 | ctx->cell = cell; | |
00d3b7a4 DH |
299 | } |
300 | ||
301 | _debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s", | |
13fcc683 DH |
302 | ctx->cell->name, ctx->cell, |
303 | ctx->volnamesz, ctx->volnamesz, ctx->volname, | |
304 | suffix ?: "-", ctx->type, ctx->force ? " FORCE" : ""); | |
305 | ||
306 | fc->source = param->string; | |
307 | param->string = NULL; | |
308 | return 0; | |
309 | } | |
310 | ||
311 | /* | |
312 | * Parse a single mount parameter. | |
313 | */ | |
314 | static int afs_parse_param(struct fs_context *fc, struct fs_parameter *param) | |
315 | { | |
316 | struct fs_parse_result result; | |
317 | struct afs_fs_context *ctx = fc->fs_private; | |
13fcc683 DH |
318 | int opt; |
319 | ||
d7167b14 | 320 | opt = fs_parse(fc, afs_fs_parameters, param, &result); |
13fcc683 DH |
321 | if (opt < 0) |
322 | return opt; | |
323 | ||
324 | switch (opt) { | |
13fcc683 DH |
325 | case Opt_source: |
326 | return afs_parse_source(fc, param); | |
327 | ||
328 | case Opt_autocell: | |
329 | ctx->autocell = true; | |
330 | break; | |
331 | ||
332 | case Opt_dyn: | |
333 | ctx->dyn_root = true; | |
334 | break; | |
335 | ||
6c6c1d63 DH |
336 | case Opt_flock: |
337 | ctx->flock_mode = result.uint_32; | |
338 | break; | |
339 | ||
13fcc683 DH |
340 | default: |
341 | return -EINVAL; | |
342 | } | |
343 | ||
344 | _leave(" = 0"); | |
345 | return 0; | |
346 | } | |
347 | ||
348 | /* | |
349 | * Validate the options, get the cell key and look up the volume. | |
350 | */ | |
351 | static int afs_validate_fc(struct fs_context *fc) | |
352 | { | |
353 | struct afs_fs_context *ctx = fc->fs_private; | |
354 | struct afs_volume *volume; | |
355 | struct key *key; | |
356 | ||
357 | if (!ctx->dyn_root) { | |
358 | if (ctx->no_cell) { | |
359 | pr_warn("kAFS: Can only specify source 'none' with -o dyn\n"); | |
360 | return -EINVAL; | |
361 | } | |
362 | ||
363 | if (!ctx->cell) { | |
364 | pr_warn("kAFS: No cell specified\n"); | |
365 | return -EDESTADDRREQ; | |
366 | } | |
367 | ||
368 | /* We try to do the mount securely. */ | |
369 | key = afs_request_key(ctx->cell); | |
370 | if (IS_ERR(key)) | |
371 | return PTR_ERR(key); | |
372 | ||
373 | ctx->key = key; | |
374 | ||
375 | if (ctx->volume) { | |
376 | afs_put_volume(ctx->cell, ctx->volume); | |
377 | ctx->volume = NULL; | |
378 | } | |
379 | ||
380 | volume = afs_create_volume(ctx); | |
381 | if (IS_ERR(volume)) | |
382 | return PTR_ERR(volume); | |
383 | ||
384 | ctx->volume = volume; | |
385 | } | |
00d3b7a4 DH |
386 | |
387 | return 0; | |
388 | } | |
389 | ||
1da177e4 LT |
390 | /* |
391 | * check a superblock to see if it's the one we're looking for | |
392 | */ | |
13fcc683 | 393 | static int afs_test_super(struct super_block *sb, struct fs_context *fc) |
1da177e4 | 394 | { |
13fcc683 | 395 | struct afs_fs_context *ctx = fc->fs_private; |
d2ddc776 | 396 | struct afs_super_info *as = AFS_FS_S(sb); |
1da177e4 | 397 | |
13fcc683 | 398 | return (as->net_ns == fc->net_ns && |
4d673da1 | 399 | as->volume && |
13fcc683 | 400 | as->volume->vid == ctx->volume->vid && |
106bc798 | 401 | as->cell == ctx->cell && |
0da0b7fd | 402 | !as->dyn_root); |
4d673da1 DH |
403 | } |
404 | ||
13fcc683 | 405 | static int afs_dynroot_test_super(struct super_block *sb, struct fs_context *fc) |
4d673da1 | 406 | { |
0da0b7fd DH |
407 | struct afs_super_info *as = AFS_FS_S(sb); |
408 | ||
13fcc683 | 409 | return (as->net_ns == fc->net_ns && |
0da0b7fd | 410 | as->dyn_root); |
dde194a6 AV |
411 | } |
412 | ||
13fcc683 | 413 | static int afs_set_super(struct super_block *sb, struct fs_context *fc) |
dde194a6 | 414 | { |
dde194a6 | 415 | return set_anon_super(sb, NULL); |
ec26815a | 416 | } |
1da177e4 | 417 | |
1da177e4 LT |
418 | /* |
419 | * fill in the superblock | |
420 | */ | |
13fcc683 | 421 | static int afs_fill_super(struct super_block *sb, struct afs_fs_context *ctx) |
1da177e4 | 422 | { |
d2ddc776 | 423 | struct afs_super_info *as = AFS_FS_S(sb); |
b8359153 | 424 | struct afs_iget_data iget_data; |
1da177e4 LT |
425 | struct inode *inode = NULL; |
426 | int ret; | |
427 | ||
08e0e7c8 | 428 | _enter(""); |
1da177e4 | 429 | |
1da177e4 | 430 | /* fill in the superblock */ |
09cbfeaf KS |
431 | sb->s_blocksize = PAGE_SIZE; |
432 | sb->s_blocksize_bits = PAGE_SHIFT; | |
b485275f | 433 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
1da177e4 LT |
434 | sb->s_magic = AFS_FS_MAGIC; |
435 | sb->s_op = &afs_super_ops; | |
4d673da1 DH |
436 | if (!as->dyn_root) |
437 | sb->s_xattr = afs_xattr_handlers; | |
edd3ba94 JK |
438 | ret = super_setup_bdi(sb); |
439 | if (ret) | |
440 | return ret; | |
b5420237 | 441 | sb->s_bdi->ra_pages = VM_READAHEAD_PAGES; |
1da177e4 LT |
442 | |
443 | /* allocate the root inode and dentry */ | |
4d673da1 DH |
444 | if (as->dyn_root) { |
445 | inode = afs_iget_pseudo_dir(sb, true); | |
4d673da1 | 446 | } else { |
3b6492df | 447 | sprintf(sb->s_id, "%llu", as->volume->vid); |
4d673da1 | 448 | afs_activate_volume(as->volume); |
b8359153 DH |
449 | iget_data.fid.vid = as->volume->vid; |
450 | iget_data.fid.vnode = 1; | |
451 | iget_data.fid.vnode_hi = 0; | |
452 | iget_data.fid.unique = 1; | |
453 | iget_data.cb_v_break = as->volume->cb_v_break; | |
454 | iget_data.cb_s_break = 0; | |
455 | inode = afs_iget(sb, ctx->key, &iget_data, NULL, NULL, NULL); | |
4d673da1 DH |
456 | } |
457 | ||
08e0e7c8 | 458 | if (IS_ERR(inode)) |
dde194a6 | 459 | return PTR_ERR(inode); |
1da177e4 | 460 | |
13fcc683 | 461 | if (ctx->autocell || as->dyn_root) |
bec5eb61 | 462 | set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags); |
463 | ||
1da177e4 | 464 | ret = -ENOMEM; |
48fde701 AV |
465 | sb->s_root = d_make_root(inode); |
466 | if (!sb->s_root) | |
1da177e4 LT |
467 | goto error; |
468 | ||
0da0b7fd | 469 | if (as->dyn_root) { |
66c7e1d3 | 470 | sb->s_d_op = &afs_dynroot_dentry_operations; |
0da0b7fd DH |
471 | ret = afs_dynroot_populate(sb); |
472 | if (ret < 0) | |
473 | goto error; | |
474 | } else { | |
66c7e1d3 | 475 | sb->s_d_op = &afs_fs_dentry_operations; |
0da0b7fd | 476 | } |
1da177e4 | 477 | |
08e0e7c8 | 478 | _leave(" = 0"); |
1da177e4 LT |
479 | return 0; |
480 | ||
ec26815a | 481 | error: |
08e0e7c8 | 482 | _leave(" = %d", ret); |
1da177e4 | 483 | return ret; |
ec26815a | 484 | } |
1da177e4 | 485 | |
13fcc683 | 486 | static struct afs_super_info *afs_alloc_sbi(struct fs_context *fc) |
49566f6f | 487 | { |
13fcc683 | 488 | struct afs_fs_context *ctx = fc->fs_private; |
49566f6f DH |
489 | struct afs_super_info *as; |
490 | ||
491 | as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL); | |
492 | if (as) { | |
13fcc683 | 493 | as->net_ns = get_net(fc->net_ns); |
6c6c1d63 | 494 | as->flock_mode = ctx->flock_mode; |
13fcc683 | 495 | if (ctx->dyn_root) { |
4d673da1 | 496 | as->dyn_root = true; |
13fcc683 DH |
497 | } else { |
498 | as->cell = afs_get_cell(ctx->cell); | |
499 | as->volume = __afs_get_volume(ctx->volume); | |
500 | } | |
49566f6f DH |
501 | } |
502 | return as; | |
503 | } | |
504 | ||
505 | static void afs_destroy_sbi(struct afs_super_info *as) | |
506 | { | |
507 | if (as) { | |
9ed900b1 | 508 | afs_put_volume(as->cell, as->volume); |
5b86d4ff DH |
509 | afs_put_cell(afs_net(as->net_ns), as->cell); |
510 | put_net(as->net_ns); | |
49566f6f DH |
511 | kfree(as); |
512 | } | |
513 | } | |
514 | ||
0da0b7fd DH |
515 | static void afs_kill_super(struct super_block *sb) |
516 | { | |
517 | struct afs_super_info *as = AFS_FS_S(sb); | |
518 | struct afs_net *net = afs_net(as->net_ns); | |
519 | ||
520 | if (as->dyn_root) | |
521 | afs_dynroot_depopulate(sb); | |
13fcc683 | 522 | |
0da0b7fd DH |
523 | /* Clear the callback interests (which will do ilookup5) before |
524 | * deactivating the superblock. | |
525 | */ | |
526 | if (as->volume) | |
527 | afs_clear_callback_interests(net, as->volume->servers); | |
528 | kill_anon_super(sb); | |
529 | if (as->volume) | |
530 | afs_deactivate_volume(as->volume); | |
531 | afs_destroy_sbi(as); | |
532 | } | |
533 | ||
1da177e4 | 534 | /* |
13fcc683 | 535 | * Get an AFS superblock and root directory. |
1da177e4 | 536 | */ |
13fcc683 | 537 | static int afs_get_tree(struct fs_context *fc) |
1da177e4 | 538 | { |
13fcc683 | 539 | struct afs_fs_context *ctx = fc->fs_private; |
1da177e4 | 540 | struct super_block *sb; |
dde194a6 | 541 | struct afs_super_info *as; |
1da177e4 LT |
542 | int ret; |
543 | ||
13fcc683 DH |
544 | ret = afs_validate_fc(fc); |
545 | if (ret) | |
f74f70f8 | 546 | goto error; |
00d3b7a4 | 547 | |
13fcc683 | 548 | _enter(""); |
00d3b7a4 | 549 | |
49566f6f DH |
550 | /* allocate a superblock info record */ |
551 | ret = -ENOMEM; | |
13fcc683 | 552 | as = afs_alloc_sbi(fc); |
49566f6f | 553 | if (!as) |
13fcc683 DH |
554 | goto error; |
555 | fc->s_fs_info = as; | |
1da177e4 LT |
556 | |
557 | /* allocate a deviceless superblock */ | |
13fcc683 DH |
558 | sb = sget_fc(fc, |
559 | as->dyn_root ? afs_dynroot_test_super : afs_test_super, | |
560 | afs_set_super); | |
08e0e7c8 DH |
561 | if (IS_ERR(sb)) { |
562 | ret = PTR_ERR(sb); | |
13fcc683 | 563 | goto error; |
08e0e7c8 | 564 | } |
1da177e4 | 565 | |
436058a4 DH |
566 | if (!sb->s_root) { |
567 | /* initial superblock/root creation */ | |
568 | _debug("create"); | |
13fcc683 | 569 | ret = afs_fill_super(sb, ctx); |
f044c884 DH |
570 | if (ret < 0) |
571 | goto error_sb; | |
1751e8a6 | 572 | sb->s_flags |= SB_ACTIVE; |
436058a4 DH |
573 | } else { |
574 | _debug("reuse"); | |
1751e8a6 | 575 | ASSERTCMP(sb->s_flags, &, SB_ACTIVE); |
1da177e4 | 576 | } |
1da177e4 | 577 | |
13fcc683 | 578 | fc->root = dget(sb->s_root); |
80548b03 | 579 | trace_afs_get_tree(as->cell, as->volume); |
08e0e7c8 | 580 | _leave(" = 0 [%p]", sb); |
13fcc683 | 581 | return 0; |
1da177e4 | 582 | |
f044c884 DH |
583 | error_sb: |
584 | deactivate_locked_super(sb); | |
ec26815a | 585 | error: |
1da177e4 | 586 | _leave(" = %d", ret); |
13fcc683 DH |
587 | return ret; |
588 | } | |
589 | ||
590 | static void afs_free_fc(struct fs_context *fc) | |
591 | { | |
592 | struct afs_fs_context *ctx = fc->fs_private; | |
593 | ||
594 | afs_destroy_sbi(fc->s_fs_info); | |
595 | afs_put_volume(ctx->cell, ctx->volume); | |
596 | afs_put_cell(ctx->net, ctx->cell); | |
597 | key_put(ctx->key); | |
598 | kfree(ctx); | |
599 | } | |
600 | ||
601 | static const struct fs_context_operations afs_context_ops = { | |
602 | .free = afs_free_fc, | |
603 | .parse_param = afs_parse_param, | |
604 | .get_tree = afs_get_tree, | |
605 | }; | |
606 | ||
607 | /* | |
608 | * Set up the filesystem mount context. | |
609 | */ | |
610 | static int afs_init_fs_context(struct fs_context *fc) | |
611 | { | |
612 | struct afs_fs_context *ctx; | |
613 | struct afs_cell *cell; | |
614 | ||
13fcc683 DH |
615 | ctx = kzalloc(sizeof(struct afs_fs_context), GFP_KERNEL); |
616 | if (!ctx) | |
617 | return -ENOMEM; | |
618 | ||
619 | ctx->type = AFSVL_ROVOL; | |
620 | ctx->net = afs_net(fc->net_ns); | |
621 | ||
622 | /* Default to the workstation cell. */ | |
623 | rcu_read_lock(); | |
624 | cell = afs_lookup_cell_rcu(ctx->net, NULL, 0); | |
625 | rcu_read_unlock(); | |
626 | if (IS_ERR(cell)) | |
627 | cell = NULL; | |
628 | ctx->cell = cell; | |
629 | ||
630 | fc->fs_private = ctx; | |
631 | fc->ops = &afs_context_ops; | |
632 | return 0; | |
ec26815a | 633 | } |
1da177e4 | 634 | |
1da177e4 | 635 | /* |
f8de483e DH |
636 | * Initialise an inode cache slab element prior to any use. Note that |
637 | * afs_alloc_inode() *must* reset anything that could incorrectly leak from one | |
638 | * inode to another. | |
1da177e4 | 639 | */ |
51cc5068 | 640 | static void afs_i_init_once(void *_vnode) |
1da177e4 | 641 | { |
ec26815a | 642 | struct afs_vnode *vnode = _vnode; |
1da177e4 | 643 | |
a35afb83 CL |
644 | memset(vnode, 0, sizeof(*vnode)); |
645 | inode_init_once(&vnode->vfs_inode); | |
d2ddc776 | 646 | mutex_init(&vnode->io_lock); |
b61f7dcf | 647 | init_rwsem(&vnode->validate_lock); |
4343d008 | 648 | spin_lock_init(&vnode->wb_lock); |
a35afb83 | 649 | spin_lock_init(&vnode->lock); |
4343d008 | 650 | INIT_LIST_HEAD(&vnode->wb_keys); |
e8d6c554 DH |
651 | INIT_LIST_HEAD(&vnode->pending_locks); |
652 | INIT_LIST_HEAD(&vnode->granted_locks); | |
653 | INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work); | |
c435ee34 | 654 | seqlock_init(&vnode->cb_lock); |
ec26815a | 655 | } |
1da177e4 | 656 | |
1da177e4 LT |
657 | /* |
658 | * allocate an AFS inode struct from our slab cache | |
659 | */ | |
660 | static struct inode *afs_alloc_inode(struct super_block *sb) | |
661 | { | |
662 | struct afs_vnode *vnode; | |
663 | ||
ec26815a | 664 | vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
665 | if (!vnode) |
666 | return NULL; | |
667 | ||
668 | atomic_inc(&afs_count_active_inodes); | |
669 | ||
f8de483e | 670 | /* Reset anything that shouldn't leak from one inode to the next. */ |
1da177e4 LT |
671 | memset(&vnode->fid, 0, sizeof(vnode->fid)); |
672 | memset(&vnode->status, 0, sizeof(vnode->status)); | |
673 | ||
674 | vnode->volume = NULL; | |
f8de483e DH |
675 | vnode->lock_key = NULL; |
676 | vnode->permit_cache = NULL; | |
f642404a | 677 | RCU_INIT_POINTER(vnode->cb_interest, NULL); |
f8de483e DH |
678 | #ifdef CONFIG_AFS_FSCACHE |
679 | vnode->cache = NULL; | |
680 | #endif | |
681 | ||
260a9803 | 682 | vnode->flags = 1 << AFS_VNODE_UNSET; |
f8de483e | 683 | vnode->lock_state = AFS_VNODE_LOCK_NONE; |
1da177e4 | 684 | |
79ddbfa5 DH |
685 | init_rwsem(&vnode->rmdir_lock); |
686 | ||
0f300ca9 | 687 | _leave(" = %p", &vnode->vfs_inode); |
1da177e4 | 688 | return &vnode->vfs_inode; |
ec26815a | 689 | } |
1da177e4 | 690 | |
51b9fe48 | 691 | static void afs_free_inode(struct inode *inode) |
fa0d7e3d | 692 | { |
51b9fe48 | 693 | kmem_cache_free(afs_inode_cachep, AFS_FS_I(inode)); |
fa0d7e3d NP |
694 | } |
695 | ||
1da177e4 LT |
696 | /* |
697 | * destroy an AFS inode struct | |
698 | */ | |
699 | static void afs_destroy_inode(struct inode *inode) | |
700 | { | |
08e0e7c8 DH |
701 | struct afs_vnode *vnode = AFS_FS_I(inode); |
702 | ||
3b6492df | 703 | _enter("%p{%llx:%llu}", inode, vnode->fid.vid, vnode->fid.vnode); |
1da177e4 | 704 | |
08e0e7c8 DH |
705 | _debug("DESTROY INODE %p", inode); |
706 | ||
f642404a | 707 | ASSERTCMP(rcu_access_pointer(vnode->cb_interest), ==, NULL); |
08e0e7c8 | 708 | |
1da177e4 | 709 | atomic_dec(&afs_count_active_inodes); |
ec26815a | 710 | } |
45222b9e DH |
711 | |
712 | /* | |
713 | * return information about an AFS volume | |
714 | */ | |
715 | static int afs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
716 | { | |
4d673da1 | 717 | struct afs_super_info *as = AFS_FS_S(dentry->d_sb); |
d2ddc776 | 718 | struct afs_fs_cursor fc; |
45222b9e | 719 | struct afs_volume_status vs; |
2b0143b5 | 720 | struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry)); |
45222b9e DH |
721 | struct key *key; |
722 | int ret; | |
723 | ||
4d673da1 DH |
724 | buf->f_type = dentry->d_sb->s_magic; |
725 | buf->f_bsize = AFS_BLOCK_SIZE; | |
726 | buf->f_namelen = AFSNAMEMAX - 1; | |
727 | ||
728 | if (as->dyn_root) { | |
729 | buf->f_blocks = 1; | |
730 | buf->f_bavail = 0; | |
731 | buf->f_bfree = 0; | |
732 | return 0; | |
733 | } | |
66c7e1d3 | 734 | |
45222b9e DH |
735 | key = afs_request_key(vnode->volume->cell); |
736 | if (IS_ERR(key)) | |
737 | return PTR_ERR(key); | |
738 | ||
d2ddc776 | 739 | ret = -ERESTARTSYS; |
20b8391f | 740 | if (afs_begin_vnode_operation(&fc, vnode, key, true)) { |
d2ddc776 DH |
741 | fc.flags |= AFS_FS_CURSOR_NO_VSLEEP; |
742 | while (afs_select_fileserver(&fc)) { | |
68251f0a | 743 | fc.cb_break = afs_calc_vnode_cb_break(vnode); |
d2ddc776 DH |
744 | afs_fs_get_volume_status(&fc, &vs); |
745 | } | |
746 | ||
747 | afs_check_for_remote_deletion(&fc, fc.vnode); | |
d2ddc776 | 748 | ret = afs_end_vnode_operation(&fc); |
45222b9e DH |
749 | } |
750 | ||
d2ddc776 | 751 | key_put(key); |
45222b9e | 752 | |
d2ddc776 | 753 | if (ret == 0) { |
d2ddc776 DH |
754 | if (vs.max_quota == 0) |
755 | buf->f_blocks = vs.part_max_blocks; | |
756 | else | |
757 | buf->f_blocks = vs.max_quota; | |
758 | buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use; | |
759 | } | |
760 | ||
761 | return ret; | |
45222b9e | 762 | } |