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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
4b82d6e4 | 19 | #include <linux/blkdev.h> |
2e635a27 | 20 | #include <linux/module.h> |
e20d96d6 | 21 | #include <linux/buffer_head.h> |
2e635a27 CM |
22 | #include <linux/fs.h> |
23 | #include <linux/pagemap.h> | |
24 | #include <linux/highmem.h> | |
25 | #include <linux/time.h> | |
26 | #include <linux/init.h> | |
a9572a15 | 27 | #include <linux/seq_file.h> |
2e635a27 | 28 | #include <linux/string.h> |
2e635a27 | 29 | #include <linux/backing-dev.h> |
4b82d6e4 | 30 | #include <linux/mount.h> |
dee26a9f | 31 | #include <linux/mpage.h> |
75dfe396 CM |
32 | #include <linux/swap.h> |
33 | #include <linux/writeback.h> | |
8fd17795 | 34 | #include <linux/statfs.h> |
08607c1b | 35 | #include <linux/compat.h> |
95e05289 | 36 | #include <linux/parser.h> |
c59f8951 | 37 | #include <linux/ctype.h> |
6da6abae | 38 | #include <linux/namei.h> |
a9218f6b | 39 | #include <linux/miscdevice.h> |
1bcbf313 | 40 | #include <linux/magic.h> |
5a0e3ad6 | 41 | #include <linux/slab.h> |
4b4e25f2 | 42 | #include "compat.h" |
2e635a27 | 43 | #include "ctree.h" |
e20d96d6 | 44 | #include "disk-io.h" |
d5719762 | 45 | #include "transaction.h" |
2c90e5d6 | 46 | #include "btrfs_inode.h" |
c5739bba | 47 | #include "ioctl.h" |
3a686375 | 48 | #include "print-tree.h" |
5103e947 | 49 | #include "xattr.h" |
8a4b83cc | 50 | #include "volumes.h" |
b3c3da71 | 51 | #include "version.h" |
be6e8dc0 | 52 | #include "export.h" |
c8b97818 | 53 | #include "compression.h" |
2e635a27 | 54 | |
b87221de | 55 | static const struct super_operations btrfs_super_ops; |
75dfe396 | 56 | |
d397712b | 57 | static void btrfs_put_super(struct super_block *sb) |
b18c6685 | 58 | { |
39279cc3 | 59 | struct btrfs_root *root = btrfs_sb(sb); |
b18c6685 | 60 | int ret; |
b18c6685 | 61 | |
39279cc3 | 62 | ret = close_ctree(root); |
39279cc3 | 63 | sb->s_fs_info = NULL; |
559af821 AK |
64 | |
65 | (void)ret; /* FIXME: need to fix VFS to return error? */ | |
75dfe396 CM |
66 | } |
67 | ||
95e05289 | 68 | enum { |
73f73415 | 69 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
287a0ab9 JB |
70 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
71 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, | |
72 | Opt_compress_force, Opt_notreelog, Opt_ratio, Opt_flushoncommit, | |
88c2ba3b | 73 | Opt_discard, Opt_space_cache, Opt_clear_cache, Opt_err, |
4260f7c7 | 74 | Opt_user_subvol_rm_allowed, |
95e05289 CM |
75 | }; |
76 | ||
77 | static match_table_t tokens = { | |
dfe25020 | 78 | {Opt_degraded, "degraded"}, |
95e05289 | 79 | {Opt_subvol, "subvol=%s"}, |
73f73415 | 80 | {Opt_subvolid, "subvolid=%d"}, |
43e570b0 | 81 | {Opt_device, "device=%s"}, |
b6cda9bc | 82 | {Opt_nodatasum, "nodatasum"}, |
be20aa9d | 83 | {Opt_nodatacow, "nodatacow"}, |
21ad10cf | 84 | {Opt_nobarrier, "nobarrier"}, |
6f568d35 | 85 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 86 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 87 | {Opt_thread_pool, "thread_pool=%d"}, |
c8b97818 | 88 | {Opt_compress, "compress"}, |
a555f810 | 89 | {Opt_compress_force, "compress-force"}, |
e18e4809 | 90 | {Opt_ssd, "ssd"}, |
451d7585 | 91 | {Opt_ssd_spread, "ssd_spread"}, |
3b30c22f | 92 | {Opt_nossd, "nossd"}, |
33268eaf | 93 | {Opt_noacl, "noacl"}, |
3a5e1404 | 94 | {Opt_notreelog, "notreelog"}, |
dccae999 | 95 | {Opt_flushoncommit, "flushoncommit"}, |
97e728d4 | 96 | {Opt_ratio, "metadata_ratio=%d"}, |
e244a0ae | 97 | {Opt_discard, "discard"}, |
0af3d00b | 98 | {Opt_space_cache, "space_cache"}, |
88c2ba3b | 99 | {Opt_clear_cache, "clear_cache"}, |
4260f7c7 | 100 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
33268eaf | 101 | {Opt_err, NULL}, |
95e05289 CM |
102 | }; |
103 | ||
edf24abe CH |
104 | /* |
105 | * Regular mount options parser. Everything that is needed only when | |
106 | * reading in a new superblock is parsed here. | |
107 | */ | |
108 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 109 | { |
edf24abe | 110 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 111 | substring_t args[MAX_OPT_ARGS]; |
da495ecc | 112 | char *p, *num, *orig; |
4543df7e | 113 | int intarg; |
a7a3f7ca | 114 | int ret = 0; |
b6cda9bc | 115 | |
95e05289 | 116 | if (!options) |
edf24abe | 117 | return 0; |
95e05289 | 118 | |
be20aa9d CM |
119 | /* |
120 | * strsep changes the string, duplicate it because parse_options | |
121 | * gets called twice | |
122 | */ | |
123 | options = kstrdup(options, GFP_NOFS); | |
124 | if (!options) | |
125 | return -ENOMEM; | |
126 | ||
da495ecc | 127 | orig = options; |
be20aa9d | 128 | |
edf24abe | 129 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
130 | int token; |
131 | if (!*p) | |
132 | continue; | |
133 | ||
134 | token = match_token(p, tokens, args); | |
135 | switch (token) { | |
dfe25020 | 136 | case Opt_degraded: |
edf24abe CH |
137 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
138 | btrfs_set_opt(info->mount_opt, DEGRADED); | |
dfe25020 | 139 | break; |
95e05289 | 140 | case Opt_subvol: |
73f73415 | 141 | case Opt_subvolid: |
43e570b0 | 142 | case Opt_device: |
edf24abe | 143 | /* |
43e570b0 | 144 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
145 | * and can be happily ignored here. |
146 | */ | |
b6cda9bc CM |
147 | break; |
148 | case Opt_nodatasum: | |
067c28ad | 149 | printk(KERN_INFO "btrfs: setting nodatasum\n"); |
edf24abe | 150 | btrfs_set_opt(info->mount_opt, NODATASUM); |
be20aa9d CM |
151 | break; |
152 | case Opt_nodatacow: | |
edf24abe CH |
153 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
154 | btrfs_set_opt(info->mount_opt, NODATACOW); | |
155 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 156 | break; |
c8b97818 CM |
157 | case Opt_compress: |
158 | printk(KERN_INFO "btrfs: use compression\n"); | |
159 | btrfs_set_opt(info->mount_opt, COMPRESS); | |
160 | break; | |
a555f810 CM |
161 | case Opt_compress_force: |
162 | printk(KERN_INFO "btrfs: forcing compression\n"); | |
163 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); | |
164 | btrfs_set_opt(info->mount_opt, COMPRESS); | |
165 | break; | |
e18e4809 | 166 | case Opt_ssd: |
edf24abe CH |
167 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
168 | btrfs_set_opt(info->mount_opt, SSD); | |
e18e4809 | 169 | break; |
451d7585 CM |
170 | case Opt_ssd_spread: |
171 | printk(KERN_INFO "btrfs: use spread ssd " | |
172 | "allocation scheme\n"); | |
173 | btrfs_set_opt(info->mount_opt, SSD); | |
174 | btrfs_set_opt(info->mount_opt, SSD_SPREAD); | |
175 | break; | |
3b30c22f | 176 | case Opt_nossd: |
451d7585 CM |
177 | printk(KERN_INFO "btrfs: not using ssd allocation " |
178 | "scheme\n"); | |
c289811c | 179 | btrfs_set_opt(info->mount_opt, NOSSD); |
3b30c22f | 180 | btrfs_clear_opt(info->mount_opt, SSD); |
451d7585 | 181 | btrfs_clear_opt(info->mount_opt, SSD_SPREAD); |
3b30c22f | 182 | break; |
21ad10cf | 183 | case Opt_nobarrier: |
edf24abe CH |
184 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
185 | btrfs_set_opt(info->mount_opt, NOBARRIER); | |
21ad10cf | 186 | break; |
4543df7e CM |
187 | case Opt_thread_pool: |
188 | intarg = 0; | |
189 | match_int(&args[0], &intarg); | |
190 | if (intarg) { | |
191 | info->thread_pool_size = intarg; | |
192 | printk(KERN_INFO "btrfs: thread pool %d\n", | |
193 | info->thread_pool_size); | |
194 | } | |
195 | break; | |
6f568d35 | 196 | case Opt_max_inline: |
edf24abe CH |
197 | num = match_strdup(&args[0]); |
198 | if (num) { | |
91748467 | 199 | info->max_inline = memparse(num, NULL); |
edf24abe CH |
200 | kfree(num); |
201 | ||
15ada040 CM |
202 | if (info->max_inline) { |
203 | info->max_inline = max_t(u64, | |
204 | info->max_inline, | |
205 | root->sectorsize); | |
206 | } | |
edf24abe | 207 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
21380931 | 208 | (unsigned long long)info->max_inline); |
6f568d35 CM |
209 | } |
210 | break; | |
8f662a76 | 211 | case Opt_alloc_start: |
edf24abe CH |
212 | num = match_strdup(&args[0]); |
213 | if (num) { | |
91748467 | 214 | info->alloc_start = memparse(num, NULL); |
edf24abe CH |
215 | kfree(num); |
216 | printk(KERN_INFO | |
217 | "btrfs: allocations start at %llu\n", | |
21380931 | 218 | (unsigned long long)info->alloc_start); |
8f662a76 CM |
219 | } |
220 | break; | |
33268eaf JB |
221 | case Opt_noacl: |
222 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
223 | break; | |
3a5e1404 SW |
224 | case Opt_notreelog: |
225 | printk(KERN_INFO "btrfs: disabling tree log\n"); | |
226 | btrfs_set_opt(info->mount_opt, NOTREELOG); | |
227 | break; | |
dccae999 SW |
228 | case Opt_flushoncommit: |
229 | printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); | |
230 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); | |
231 | break; | |
97e728d4 JB |
232 | case Opt_ratio: |
233 | intarg = 0; | |
234 | match_int(&args[0], &intarg); | |
235 | if (intarg) { | |
236 | info->metadata_ratio = intarg; | |
237 | printk(KERN_INFO "btrfs: metadata ratio %d\n", | |
238 | info->metadata_ratio); | |
239 | } | |
240 | break; | |
e244a0ae CH |
241 | case Opt_discard: |
242 | btrfs_set_opt(info->mount_opt, DISCARD); | |
243 | break; | |
0af3d00b JB |
244 | case Opt_space_cache: |
245 | printk(KERN_INFO "btrfs: enabling disk space caching\n"); | |
246 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); | |
0de90876 | 247 | break; |
88c2ba3b JB |
248 | case Opt_clear_cache: |
249 | printk(KERN_INFO "btrfs: force clearing of disk cache\n"); | |
250 | btrfs_set_opt(info->mount_opt, CLEAR_CACHE); | |
0af3d00b | 251 | break; |
4260f7c7 SW |
252 | case Opt_user_subvol_rm_allowed: |
253 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); | |
254 | break; | |
a7a3f7ca SW |
255 | case Opt_err: |
256 | printk(KERN_INFO "btrfs: unrecognized mount option " | |
257 | "'%s'\n", p); | |
258 | ret = -EINVAL; | |
259 | goto out; | |
95e05289 | 260 | default: |
be20aa9d | 261 | break; |
95e05289 CM |
262 | } |
263 | } | |
a7a3f7ca | 264 | out: |
da495ecc | 265 | kfree(orig); |
a7a3f7ca | 266 | return ret; |
edf24abe CH |
267 | } |
268 | ||
269 | /* | |
270 | * Parse mount options that are required early in the mount process. | |
271 | * | |
272 | * All other options will be parsed on much later in the mount process and | |
273 | * only when we need to allocate a new super block. | |
274 | */ | |
97288f2c | 275 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
73f73415 | 276 | void *holder, char **subvol_name, u64 *subvol_objectid, |
43e570b0 | 277 | struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
278 | { |
279 | substring_t args[MAX_OPT_ARGS]; | |
280 | char *opts, *p; | |
281 | int error = 0; | |
73f73415 | 282 | int intarg; |
edf24abe CH |
283 | |
284 | if (!options) | |
285 | goto out; | |
286 | ||
287 | /* | |
288 | * strsep changes the string, duplicate it because parse_options | |
289 | * gets called twice | |
290 | */ | |
291 | opts = kstrdup(options, GFP_KERNEL); | |
292 | if (!opts) | |
293 | return -ENOMEM; | |
294 | ||
295 | while ((p = strsep(&opts, ",")) != NULL) { | |
296 | int token; | |
297 | if (!*p) | |
298 | continue; | |
299 | ||
300 | token = match_token(p, tokens, args); | |
301 | switch (token) { | |
302 | case Opt_subvol: | |
303 | *subvol_name = match_strdup(&args[0]); | |
304 | break; | |
73f73415 JB |
305 | case Opt_subvolid: |
306 | intarg = 0; | |
4849f01d JB |
307 | error = match_int(&args[0], &intarg); |
308 | if (!error) { | |
309 | /* we want the original fs_tree */ | |
310 | if (!intarg) | |
311 | *subvol_objectid = | |
312 | BTRFS_FS_TREE_OBJECTID; | |
313 | else | |
314 | *subvol_objectid = intarg; | |
315 | } | |
73f73415 | 316 | break; |
43e570b0 CH |
317 | case Opt_device: |
318 | error = btrfs_scan_one_device(match_strdup(&args[0]), | |
319 | flags, holder, fs_devices); | |
320 | if (error) | |
321 | goto out_free_opts; | |
322 | break; | |
edf24abe CH |
323 | default: |
324 | break; | |
325 | } | |
326 | } | |
327 | ||
43e570b0 | 328 | out_free_opts: |
edf24abe CH |
329 | kfree(opts); |
330 | out: | |
331 | /* | |
332 | * If no subvolume name is specified we use the default one. Allocate | |
3de4586c | 333 | * a copy of the string "." here so that code later in the |
edf24abe CH |
334 | * mount path doesn't care if it's the default volume or another one. |
335 | */ | |
336 | if (!*subvol_name) { | |
3de4586c | 337 | *subvol_name = kstrdup(".", GFP_KERNEL); |
edf24abe CH |
338 | if (!*subvol_name) |
339 | return -ENOMEM; | |
340 | } | |
341 | return error; | |
95e05289 CM |
342 | } |
343 | ||
73f73415 JB |
344 | static struct dentry *get_default_root(struct super_block *sb, |
345 | u64 subvol_objectid) | |
346 | { | |
347 | struct btrfs_root *root = sb->s_fs_info; | |
348 | struct btrfs_root *new_root; | |
349 | struct btrfs_dir_item *di; | |
350 | struct btrfs_path *path; | |
351 | struct btrfs_key location; | |
352 | struct inode *inode; | |
353 | struct dentry *dentry; | |
354 | u64 dir_id; | |
355 | int new = 0; | |
356 | ||
357 | /* | |
358 | * We have a specific subvol we want to mount, just setup location and | |
359 | * go look up the root. | |
360 | */ | |
361 | if (subvol_objectid) { | |
362 | location.objectid = subvol_objectid; | |
363 | location.type = BTRFS_ROOT_ITEM_KEY; | |
364 | location.offset = (u64)-1; | |
365 | goto find_root; | |
366 | } | |
367 | ||
368 | path = btrfs_alloc_path(); | |
369 | if (!path) | |
370 | return ERR_PTR(-ENOMEM); | |
371 | path->leave_spinning = 1; | |
372 | ||
373 | /* | |
374 | * Find the "default" dir item which points to the root item that we | |
375 | * will mount by default if we haven't been given a specific subvolume | |
376 | * to mount. | |
377 | */ | |
378 | dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); | |
379 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); | |
fb4f6f91 DC |
380 | if (IS_ERR(di)) |
381 | return ERR_CAST(di); | |
73f73415 JB |
382 | if (!di) { |
383 | /* | |
384 | * Ok the default dir item isn't there. This is weird since | |
385 | * it's always been there, but don't freak out, just try and | |
386 | * mount to root most subvolume. | |
387 | */ | |
388 | btrfs_free_path(path); | |
389 | dir_id = BTRFS_FIRST_FREE_OBJECTID; | |
390 | new_root = root->fs_info->fs_root; | |
391 | goto setup_root; | |
392 | } | |
393 | ||
394 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
395 | btrfs_free_path(path); | |
396 | ||
397 | find_root: | |
398 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
399 | if (IS_ERR(new_root)) | |
d0b678cb | 400 | return ERR_CAST(new_root); |
73f73415 JB |
401 | |
402 | if (btrfs_root_refs(&new_root->root_item) == 0) | |
403 | return ERR_PTR(-ENOENT); | |
404 | ||
405 | dir_id = btrfs_root_dirid(&new_root->root_item); | |
406 | setup_root: | |
407 | location.objectid = dir_id; | |
408 | location.type = BTRFS_INODE_ITEM_KEY; | |
409 | location.offset = 0; | |
410 | ||
411 | inode = btrfs_iget(sb, &location, new_root, &new); | |
4cbd1149 DC |
412 | if (IS_ERR(inode)) |
413 | return ERR_CAST(inode); | |
73f73415 JB |
414 | |
415 | /* | |
416 | * If we're just mounting the root most subvol put the inode and return | |
417 | * a reference to the dentry. We will have already gotten a reference | |
418 | * to the inode in btrfs_fill_super so we're good to go. | |
419 | */ | |
420 | if (!new && sb->s_root->d_inode == inode) { | |
421 | iput(inode); | |
422 | return dget(sb->s_root); | |
423 | } | |
424 | ||
425 | if (new) { | |
426 | const struct qstr name = { .name = "/", .len = 1 }; | |
427 | ||
428 | /* | |
429 | * New inode, we need to make the dentry a sibling of s_root so | |
430 | * everything gets cleaned up properly on unmount. | |
431 | */ | |
432 | dentry = d_alloc(sb->s_root, &name); | |
433 | if (!dentry) { | |
434 | iput(inode); | |
435 | return ERR_PTR(-ENOMEM); | |
436 | } | |
437 | d_splice_alias(inode, dentry); | |
438 | } else { | |
439 | /* | |
440 | * We found the inode in cache, just find a dentry for it and | |
441 | * put the reference to the inode we just got. | |
442 | */ | |
443 | dentry = d_find_alias(inode); | |
444 | iput(inode); | |
445 | } | |
446 | ||
447 | return dentry; | |
448 | } | |
449 | ||
d397712b | 450 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 451 | struct btrfs_fs_devices *fs_devices, |
d397712b | 452 | void *data, int silent) |
75dfe396 | 453 | { |
d397712b CM |
454 | struct inode *inode; |
455 | struct dentry *root_dentry; | |
39279cc3 | 456 | struct btrfs_root *tree_root; |
5d4f98a2 | 457 | struct btrfs_key key; |
39279cc3 | 458 | int err; |
a429e513 | 459 | |
39279cc3 CM |
460 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
461 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
462 | sb->s_op = &btrfs_super_ops; | |
be6e8dc0 | 463 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 464 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 465 | sb->s_time_gran = 1; |
0eda294d | 466 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 467 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 468 | #endif |
a429e513 | 469 | |
dfe25020 | 470 | tree_root = open_ctree(sb, fs_devices, (char *)data); |
6567e837 | 471 | |
e58ca020 | 472 | if (IS_ERR(tree_root)) { |
39279cc3 | 473 | printk("btrfs: open_ctree failed\n"); |
e58ca020 | 474 | return PTR_ERR(tree_root); |
a429e513 | 475 | } |
39279cc3 | 476 | sb->s_fs_info = tree_root; |
a429e513 | 477 | |
5d4f98a2 YZ |
478 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
479 | key.type = BTRFS_INODE_ITEM_KEY; | |
480 | key.offset = 0; | |
73f73415 | 481 | inode = btrfs_iget(sb, &key, tree_root->fs_info->fs_root, NULL); |
5d4f98a2 YZ |
482 | if (IS_ERR(inode)) { |
483 | err = PTR_ERR(inode); | |
39279cc3 | 484 | goto fail_close; |
f254e52c | 485 | } |
f254e52c | 486 | |
39279cc3 CM |
487 | root_dentry = d_alloc_root(inode); |
488 | if (!root_dentry) { | |
489 | iput(inode); | |
490 | err = -ENOMEM; | |
491 | goto fail_close; | |
f254e52c | 492 | } |
58176a96 | 493 | |
39279cc3 | 494 | sb->s_root = root_dentry; |
6885f308 | 495 | |
6885f308 | 496 | save_mount_options(sb, data); |
2619ba1f | 497 | return 0; |
39279cc3 CM |
498 | |
499 | fail_close: | |
500 | close_ctree(tree_root); | |
501 | return err; | |
2619ba1f CM |
502 | } |
503 | ||
6bf13c0c | 504 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
505 | { |
506 | struct btrfs_trans_handle *trans; | |
dccae999 | 507 | struct btrfs_root *root = btrfs_sb(sb); |
c5739bba | 508 | int ret; |
2619ba1f | 509 | |
39279cc3 CM |
510 | if (!wait) { |
511 | filemap_flush(root->fs_info->btree_inode->i_mapping); | |
512 | return 0; | |
513 | } | |
771ed689 | 514 | |
24bbcf04 YZ |
515 | btrfs_start_delalloc_inodes(root, 0); |
516 | btrfs_wait_ordered_extents(root, 0, 0); | |
771ed689 | 517 | |
a22285a6 | 518 | trans = btrfs_start_transaction(root, 0); |
c5739bba | 519 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d | 520 | return ret; |
2c90e5d6 CM |
521 | } |
522 | ||
a9572a15 EP |
523 | static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
524 | { | |
525 | struct btrfs_root *root = btrfs_sb(vfs->mnt_sb); | |
526 | struct btrfs_fs_info *info = root->fs_info; | |
527 | ||
528 | if (btrfs_test_opt(root, DEGRADED)) | |
529 | seq_puts(seq, ",degraded"); | |
530 | if (btrfs_test_opt(root, NODATASUM)) | |
531 | seq_puts(seq, ",nodatasum"); | |
532 | if (btrfs_test_opt(root, NODATACOW)) | |
533 | seq_puts(seq, ",nodatacow"); | |
534 | if (btrfs_test_opt(root, NOBARRIER)) | |
535 | seq_puts(seq, ",nobarrier"); | |
a9572a15 | 536 | if (info->max_inline != 8192 * 1024) |
21380931 JB |
537 | seq_printf(seq, ",max_inline=%llu", |
538 | (unsigned long long)info->max_inline); | |
a9572a15 | 539 | if (info->alloc_start != 0) |
21380931 JB |
540 | seq_printf(seq, ",alloc_start=%llu", |
541 | (unsigned long long)info->alloc_start); | |
a9572a15 EP |
542 | if (info->thread_pool_size != min_t(unsigned long, |
543 | num_online_cpus() + 2, 8)) | |
544 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
545 | if (btrfs_test_opt(root, COMPRESS)) | |
546 | seq_puts(seq, ",compress"); | |
c289811c CM |
547 | if (btrfs_test_opt(root, NOSSD)) |
548 | seq_puts(seq, ",nossd"); | |
451d7585 CM |
549 | if (btrfs_test_opt(root, SSD_SPREAD)) |
550 | seq_puts(seq, ",ssd_spread"); | |
551 | else if (btrfs_test_opt(root, SSD)) | |
a9572a15 | 552 | seq_puts(seq, ",ssd"); |
3a5e1404 | 553 | if (btrfs_test_opt(root, NOTREELOG)) |
6b65c5c6 | 554 | seq_puts(seq, ",notreelog"); |
dccae999 | 555 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
6b65c5c6 | 556 | seq_puts(seq, ",flushoncommit"); |
20a5239a MW |
557 | if (btrfs_test_opt(root, DISCARD)) |
558 | seq_puts(seq, ",discard"); | |
a9572a15 EP |
559 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
560 | seq_puts(seq, ",noacl"); | |
561 | return 0; | |
562 | } | |
563 | ||
a061fc8d | 564 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 565 | { |
450ba0ea | 566 | struct btrfs_root *test_root = data; |
a061fc8d | 567 | struct btrfs_root *root = btrfs_sb(s); |
4b82d6e4 | 568 | |
619c8c76 IK |
569 | /* |
570 | * If this super block is going away, return false as it | |
571 | * can't match as an existing super block. | |
572 | */ | |
573 | if (!atomic_read(&s->s_active)) | |
574 | return 0; | |
450ba0ea | 575 | return root->fs_info->fs_devices == test_root->fs_info->fs_devices; |
4b82d6e4 Y |
576 | } |
577 | ||
450ba0ea JB |
578 | static int btrfs_set_super(struct super_block *s, void *data) |
579 | { | |
580 | s->s_fs_info = data; | |
581 | ||
582 | return set_anon_super(s, data); | |
4b82d6e4 Y |
583 | } |
584 | ||
450ba0ea | 585 | |
edf24abe CH |
586 | /* |
587 | * Find a superblock for the given device / mount point. | |
588 | * | |
589 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
590 | * for multiple device setup. Make sure to keep it in sync. | |
591 | */ | |
061dbc6b AV |
592 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
593 | const char *dev_name, void *data) | |
4b82d6e4 Y |
594 | { |
595 | struct block_device *bdev = NULL; | |
596 | struct super_block *s; | |
597 | struct dentry *root; | |
8a4b83cc | 598 | struct btrfs_fs_devices *fs_devices = NULL; |
450ba0ea JB |
599 | struct btrfs_root *tree_root = NULL; |
600 | struct btrfs_fs_info *fs_info = NULL; | |
97288f2c | 601 | fmode_t mode = FMODE_READ; |
73f73415 JB |
602 | char *subvol_name = NULL; |
603 | u64 subvol_objectid = 0; | |
4b82d6e4 Y |
604 | int error = 0; |
605 | ||
97288f2c CH |
606 | if (!(flags & MS_RDONLY)) |
607 | mode |= FMODE_WRITE; | |
608 | ||
609 | error = btrfs_parse_early_options(data, mode, fs_type, | |
73f73415 JB |
610 | &subvol_name, &subvol_objectid, |
611 | &fs_devices); | |
edf24abe | 612 | if (error) |
061dbc6b | 613 | return ERR_PTR(error); |
edf24abe | 614 | |
97288f2c | 615 | error = btrfs_scan_one_device(dev_name, mode, fs_type, &fs_devices); |
8a4b83cc | 616 | if (error) |
edf24abe | 617 | goto error_free_subvol_name; |
4b82d6e4 | 618 | |
97288f2c | 619 | error = btrfs_open_devices(fs_devices, mode, fs_type); |
8a4b83cc | 620 | if (error) |
edf24abe | 621 | goto error_free_subvol_name; |
8a4b83cc | 622 | |
2b82032c YZ |
623 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { |
624 | error = -EACCES; | |
625 | goto error_close_devices; | |
626 | } | |
627 | ||
450ba0ea JB |
628 | /* |
629 | * Setup a dummy root and fs_info for test/set super. This is because | |
630 | * we don't actually fill this stuff out until open_ctree, but we need | |
631 | * it for searching for existing supers, so this lets us do that and | |
632 | * then open_ctree will properly initialize everything later. | |
633 | */ | |
634 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); | |
635 | tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS); | |
636 | if (!fs_info || !tree_root) { | |
637 | error = -ENOMEM; | |
638 | goto error_close_devices; | |
639 | } | |
640 | fs_info->tree_root = tree_root; | |
641 | fs_info->fs_devices = fs_devices; | |
642 | tree_root->fs_info = fs_info; | |
643 | ||
dfe25020 | 644 | bdev = fs_devices->latest_bdev; |
450ba0ea | 645 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, tree_root); |
4b82d6e4 Y |
646 | if (IS_ERR(s)) |
647 | goto error_s; | |
648 | ||
649 | if (s->s_root) { | |
650 | if ((flags ^ s->s_flags) & MS_RDONLY) { | |
6f5bbff9 | 651 | deactivate_locked_super(s); |
4b82d6e4 | 652 | error = -EBUSY; |
c146afad | 653 | goto error_close_devices; |
4b82d6e4 Y |
654 | } |
655 | ||
2b82032c | 656 | btrfs_close_devices(fs_devices); |
4b82d6e4 Y |
657 | } else { |
658 | char b[BDEVNAME_SIZE]; | |
659 | ||
660 | s->s_flags = flags; | |
661 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); | |
8a4b83cc CM |
662 | error = btrfs_fill_super(s, fs_devices, data, |
663 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 | 664 | if (error) { |
6f5bbff9 | 665 | deactivate_locked_super(s); |
1f483660 | 666 | goto error_free_subvol_name; |
4b82d6e4 Y |
667 | } |
668 | ||
788f20eb | 669 | btrfs_sb(s)->fs_info->bdev_holder = fs_type; |
4b82d6e4 Y |
670 | s->s_flags |= MS_ACTIVE; |
671 | } | |
672 | ||
73f73415 JB |
673 | root = get_default_root(s, subvol_objectid); |
674 | if (IS_ERR(root)) { | |
675 | error = PTR_ERR(root); | |
676 | deactivate_locked_super(s); | |
0e78340f | 677 | goto error_free_subvol_name; |
73f73415 JB |
678 | } |
679 | /* if they gave us a subvolume name bind mount into that */ | |
680 | if (strcmp(subvol_name, ".")) { | |
681 | struct dentry *new_root; | |
682 | mutex_lock(&root->d_inode->i_mutex); | |
683 | new_root = lookup_one_len(subvol_name, root, | |
d397712b | 684 | strlen(subvol_name)); |
73f73415 | 685 | mutex_unlock(&root->d_inode->i_mutex); |
d397712b | 686 | |
73f73415 | 687 | if (IS_ERR(new_root)) { |
f106e82c | 688 | dput(root); |
6f5bbff9 | 689 | deactivate_locked_super(s); |
73f73415 | 690 | error = PTR_ERR(new_root); |
0e78340f | 691 | goto error_free_subvol_name; |
76fcef19 | 692 | } |
73f73415 | 693 | if (!new_root->d_inode) { |
76fcef19 | 694 | dput(root); |
73f73415 | 695 | dput(new_root); |
6f5bbff9 | 696 | deactivate_locked_super(s); |
76fcef19 | 697 | error = -ENXIO; |
0e78340f | 698 | goto error_free_subvol_name; |
76fcef19 | 699 | } |
73f73415 JB |
700 | dput(root); |
701 | root = new_root; | |
4b82d6e4 Y |
702 | } |
703 | ||
edf24abe | 704 | kfree(subvol_name); |
061dbc6b | 705 | return root; |
4b82d6e4 Y |
706 | |
707 | error_s: | |
708 | error = PTR_ERR(s); | |
c146afad | 709 | error_close_devices: |
8a4b83cc | 710 | btrfs_close_devices(fs_devices); |
450ba0ea JB |
711 | kfree(fs_info); |
712 | kfree(tree_root); | |
edf24abe CH |
713 | error_free_subvol_name: |
714 | kfree(subvol_name); | |
061dbc6b | 715 | return ERR_PTR(error); |
4b82d6e4 | 716 | } |
2e635a27 | 717 | |
c146afad YZ |
718 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
719 | { | |
720 | struct btrfs_root *root = btrfs_sb(sb); | |
721 | int ret; | |
722 | ||
b288052e CM |
723 | ret = btrfs_parse_options(root, data); |
724 | if (ret) | |
725 | return -EINVAL; | |
726 | ||
c146afad YZ |
727 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
728 | return 0; | |
729 | ||
730 | if (*flags & MS_RDONLY) { | |
731 | sb->s_flags |= MS_RDONLY; | |
732 | ||
733 | ret = btrfs_commit_super(root); | |
734 | WARN_ON(ret); | |
735 | } else { | |
2b82032c YZ |
736 | if (root->fs_info->fs_devices->rw_devices == 0) |
737 | return -EACCES; | |
738 | ||
c146afad YZ |
739 | if (btrfs_super_log_root(&root->fs_info->super_copy) != 0) |
740 | return -EINVAL; | |
741 | ||
d68fc57b | 742 | ret = btrfs_cleanup_fs_roots(root->fs_info); |
c146afad YZ |
743 | WARN_ON(ret); |
744 | ||
d68fc57b YZ |
745 | /* recover relocation */ |
746 | ret = btrfs_recover_relocation(root); | |
c146afad YZ |
747 | WARN_ON(ret); |
748 | ||
749 | sb->s_flags &= ~MS_RDONLY; | |
750 | } | |
751 | ||
752 | return 0; | |
753 | } | |
754 | ||
8fd17795 CM |
755 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
756 | { | |
757 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
4b52dff6 | 758 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
bd4d1088 JB |
759 | struct list_head *head = &root->fs_info->space_info; |
760 | struct btrfs_space_info *found; | |
761 | u64 total_used = 0; | |
89a55897 | 762 | u64 total_used_data = 0; |
db94535d | 763 | int bits = dentry->d_sb->s_blocksize_bits; |
9d03632e | 764 | __be32 *fsid = (__be32 *)root->fs_info->fsid; |
8fd17795 | 765 | |
bd4d1088 | 766 | rcu_read_lock(); |
89a55897 JB |
767 | list_for_each_entry_rcu(found, head, list) { |
768 | if (found->flags & (BTRFS_BLOCK_GROUP_METADATA | | |
769 | BTRFS_BLOCK_GROUP_SYSTEM)) | |
770 | total_used_data += found->disk_total; | |
771 | else | |
772 | total_used_data += found->disk_used; | |
b742bb82 | 773 | total_used += found->disk_used; |
89a55897 | 774 | } |
bd4d1088 JB |
775 | rcu_read_unlock(); |
776 | ||
8fd17795 | 777 | buf->f_namelen = BTRFS_NAME_LEN; |
db94535d | 778 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
bd4d1088 | 779 | buf->f_bfree = buf->f_blocks - (total_used >> bits); |
89a55897 | 780 | buf->f_bavail = buf->f_blocks - (total_used_data >> bits); |
8fd17795 CM |
781 | buf->f_bsize = dentry->d_sb->s_blocksize; |
782 | buf->f_type = BTRFS_SUPER_MAGIC; | |
d397712b | 783 | |
9d03632e | 784 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 785 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
786 | on a big-endian or little-endian host */ |
787 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
788 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 DW |
789 | /* Mask in the root object ID too, to disambiguate subvols */ |
790 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; | |
791 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; | |
792 | ||
8fd17795 CM |
793 | return 0; |
794 | } | |
b5133862 | 795 | |
2e635a27 CM |
796 | static struct file_system_type btrfs_fs_type = { |
797 | .owner = THIS_MODULE, | |
798 | .name = "btrfs", | |
061dbc6b | 799 | .mount = btrfs_mount, |
a061fc8d | 800 | .kill_sb = kill_anon_super, |
2e635a27 CM |
801 | .fs_flags = FS_REQUIRES_DEV, |
802 | }; | |
a9218f6b | 803 | |
d352ac68 CM |
804 | /* |
805 | * used by btrfsctl to scan devices when no FS is mounted | |
806 | */ | |
8a4b83cc CM |
807 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
808 | unsigned long arg) | |
809 | { | |
810 | struct btrfs_ioctl_vol_args *vol; | |
811 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 812 | int ret = -ENOTTY; |
8a4b83cc | 813 | |
e441d54d CM |
814 | if (!capable(CAP_SYS_ADMIN)) |
815 | return -EPERM; | |
816 | ||
dae7b665 LZ |
817 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
818 | if (IS_ERR(vol)) | |
819 | return PTR_ERR(vol); | |
c071fcfd | 820 | |
8a4b83cc CM |
821 | switch (cmd) { |
822 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 823 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
824 | &btrfs_fs_type, &fs_devices); |
825 | break; | |
826 | } | |
dae7b665 | 827 | |
8a4b83cc | 828 | kfree(vol); |
f819d837 | 829 | return ret; |
8a4b83cc CM |
830 | } |
831 | ||
0176260f | 832 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b Y |
833 | { |
834 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
835 | mutex_lock(&root->fs_info->transaction_kthread_mutex); |
836 | mutex_lock(&root->fs_info->cleaner_mutex); | |
0176260f | 837 | return 0; |
ed0dab6b Y |
838 | } |
839 | ||
0176260f | 840 | static int btrfs_unfreeze(struct super_block *sb) |
ed0dab6b Y |
841 | { |
842 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
843 | mutex_unlock(&root->fs_info->cleaner_mutex); |
844 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
0176260f | 845 | return 0; |
ed0dab6b | 846 | } |
2e635a27 | 847 | |
b87221de | 848 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 849 | .drop_inode = btrfs_drop_inode, |
bd555975 | 850 | .evict_inode = btrfs_evict_inode, |
e20d96d6 | 851 | .put_super = btrfs_put_super, |
d5719762 | 852 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 853 | .show_options = btrfs_show_options, |
4730a4bc | 854 | .write_inode = btrfs_write_inode, |
b5133862 | 855 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
856 | .alloc_inode = btrfs_alloc_inode, |
857 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 858 | .statfs = btrfs_statfs, |
c146afad | 859 | .remount_fs = btrfs_remount, |
0176260f LT |
860 | .freeze_fs = btrfs_freeze, |
861 | .unfreeze_fs = btrfs_unfreeze, | |
e20d96d6 | 862 | }; |
a9218f6b CM |
863 | |
864 | static const struct file_operations btrfs_ctl_fops = { | |
865 | .unlocked_ioctl = btrfs_control_ioctl, | |
866 | .compat_ioctl = btrfs_control_ioctl, | |
867 | .owner = THIS_MODULE, | |
6038f373 | 868 | .llseek = noop_llseek, |
a9218f6b CM |
869 | }; |
870 | ||
871 | static struct miscdevice btrfs_misc = { | |
578454ff | 872 | .minor = BTRFS_MINOR, |
a9218f6b CM |
873 | .name = "btrfs-control", |
874 | .fops = &btrfs_ctl_fops | |
875 | }; | |
876 | ||
578454ff KS |
877 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
878 | MODULE_ALIAS("devname:btrfs-control"); | |
879 | ||
a9218f6b CM |
880 | static int btrfs_interface_init(void) |
881 | { | |
882 | return misc_register(&btrfs_misc); | |
883 | } | |
884 | ||
b2950863 | 885 | static void btrfs_interface_exit(void) |
a9218f6b CM |
886 | { |
887 | if (misc_deregister(&btrfs_misc) < 0) | |
d397712b | 888 | printk(KERN_INFO "misc_deregister failed for control device"); |
a9218f6b CM |
889 | } |
890 | ||
2e635a27 CM |
891 | static int __init init_btrfs_fs(void) |
892 | { | |
2c90e5d6 | 893 | int err; |
58176a96 JB |
894 | |
895 | err = btrfs_init_sysfs(); | |
896 | if (err) | |
897 | return err; | |
898 | ||
39279cc3 | 899 | err = btrfs_init_cachep(); |
2c90e5d6 | 900 | if (err) |
a74a4b97 | 901 | goto free_sysfs; |
d1310b2e CM |
902 | |
903 | err = extent_io_init(); | |
2f4cbe64 WB |
904 | if (err) |
905 | goto free_cachep; | |
906 | ||
d1310b2e CM |
907 | err = extent_map_init(); |
908 | if (err) | |
909 | goto free_extent_io; | |
910 | ||
a9218f6b | 911 | err = btrfs_interface_init(); |
2f4cbe64 WB |
912 | if (err) |
913 | goto free_extent_map; | |
c8b97818 | 914 | |
a9218f6b CM |
915 | err = register_filesystem(&btrfs_fs_type); |
916 | if (err) | |
917 | goto unregister_ioctl; | |
b3c3da71 CM |
918 | |
919 | printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); | |
2f4cbe64 WB |
920 | return 0; |
921 | ||
a9218f6b CM |
922 | unregister_ioctl: |
923 | btrfs_interface_exit(); | |
2f4cbe64 WB |
924 | free_extent_map: |
925 | extent_map_exit(); | |
d1310b2e CM |
926 | free_extent_io: |
927 | extent_io_exit(); | |
2f4cbe64 WB |
928 | free_cachep: |
929 | btrfs_destroy_cachep(); | |
a74a4b97 | 930 | free_sysfs: |
2f4cbe64 WB |
931 | btrfs_exit_sysfs(); |
932 | return err; | |
2e635a27 CM |
933 | } |
934 | ||
935 | static void __exit exit_btrfs_fs(void) | |
936 | { | |
39279cc3 | 937 | btrfs_destroy_cachep(); |
a52d9a80 | 938 | extent_map_exit(); |
d1310b2e | 939 | extent_io_exit(); |
a9218f6b | 940 | btrfs_interface_exit(); |
2e635a27 | 941 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 942 | btrfs_exit_sysfs(); |
8a4b83cc | 943 | btrfs_cleanup_fs_uuids(); |
c8b97818 | 944 | btrfs_zlib_exit(); |
2e635a27 CM |
945 | } |
946 | ||
947 | module_init(init_btrfs_fs) | |
948 | module_exit(exit_btrfs_fs) | |
949 | ||
950 | MODULE_LICENSE("GPL"); |