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