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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; |
75dfe396 CM |
64 | } |
65 | ||
95e05289 | 66 | enum { |
73f73415 | 67 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
287a0ab9 JB |
68 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
69 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, | |
70 | Opt_compress_force, Opt_notreelog, Opt_ratio, Opt_flushoncommit, | |
e244a0ae | 71 | Opt_discard, Opt_err, |
95e05289 CM |
72 | }; |
73 | ||
74 | static match_table_t tokens = { | |
dfe25020 | 75 | {Opt_degraded, "degraded"}, |
95e05289 | 76 | {Opt_subvol, "subvol=%s"}, |
73f73415 | 77 | {Opt_subvolid, "subvolid=%d"}, |
43e570b0 | 78 | {Opt_device, "device=%s"}, |
b6cda9bc | 79 | {Opt_nodatasum, "nodatasum"}, |
be20aa9d | 80 | {Opt_nodatacow, "nodatacow"}, |
21ad10cf | 81 | {Opt_nobarrier, "nobarrier"}, |
6f568d35 | 82 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 83 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 84 | {Opt_thread_pool, "thread_pool=%d"}, |
c8b97818 | 85 | {Opt_compress, "compress"}, |
a555f810 | 86 | {Opt_compress_force, "compress-force"}, |
e18e4809 | 87 | {Opt_ssd, "ssd"}, |
451d7585 | 88 | {Opt_ssd_spread, "ssd_spread"}, |
3b30c22f | 89 | {Opt_nossd, "nossd"}, |
33268eaf | 90 | {Opt_noacl, "noacl"}, |
3a5e1404 | 91 | {Opt_notreelog, "notreelog"}, |
dccae999 | 92 | {Opt_flushoncommit, "flushoncommit"}, |
97e728d4 | 93 | {Opt_ratio, "metadata_ratio=%d"}, |
e244a0ae | 94 | {Opt_discard, "discard"}, |
33268eaf | 95 | {Opt_err, NULL}, |
95e05289 CM |
96 | }; |
97 | ||
edf24abe CH |
98 | /* |
99 | * Regular mount options parser. Everything that is needed only when | |
100 | * reading in a new superblock is parsed here. | |
101 | */ | |
102 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 103 | { |
edf24abe | 104 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 105 | substring_t args[MAX_OPT_ARGS]; |
da495ecc | 106 | char *p, *num, *orig; |
4543df7e | 107 | int intarg; |
a7a3f7ca | 108 | int ret = 0; |
b6cda9bc | 109 | |
95e05289 | 110 | if (!options) |
edf24abe | 111 | return 0; |
95e05289 | 112 | |
be20aa9d CM |
113 | /* |
114 | * strsep changes the string, duplicate it because parse_options | |
115 | * gets called twice | |
116 | */ | |
117 | options = kstrdup(options, GFP_NOFS); | |
118 | if (!options) | |
119 | return -ENOMEM; | |
120 | ||
da495ecc | 121 | orig = options; |
be20aa9d | 122 | |
edf24abe | 123 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
124 | int token; |
125 | if (!*p) | |
126 | continue; | |
127 | ||
128 | token = match_token(p, tokens, args); | |
129 | switch (token) { | |
dfe25020 | 130 | case Opt_degraded: |
edf24abe CH |
131 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
132 | btrfs_set_opt(info->mount_opt, DEGRADED); | |
dfe25020 | 133 | break; |
95e05289 | 134 | case Opt_subvol: |
73f73415 | 135 | case Opt_subvolid: |
43e570b0 | 136 | case Opt_device: |
edf24abe | 137 | /* |
43e570b0 | 138 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
139 | * and can be happily ignored here. |
140 | */ | |
b6cda9bc CM |
141 | break; |
142 | case Opt_nodatasum: | |
067c28ad | 143 | printk(KERN_INFO "btrfs: setting nodatasum\n"); |
edf24abe | 144 | btrfs_set_opt(info->mount_opt, NODATASUM); |
be20aa9d CM |
145 | break; |
146 | case Opt_nodatacow: | |
edf24abe CH |
147 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
148 | btrfs_set_opt(info->mount_opt, NODATACOW); | |
149 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 150 | break; |
c8b97818 CM |
151 | case Opt_compress: |
152 | printk(KERN_INFO "btrfs: use compression\n"); | |
153 | btrfs_set_opt(info->mount_opt, COMPRESS); | |
154 | break; | |
a555f810 CM |
155 | case Opt_compress_force: |
156 | printk(KERN_INFO "btrfs: forcing compression\n"); | |
157 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); | |
158 | btrfs_set_opt(info->mount_opt, COMPRESS); | |
159 | break; | |
e18e4809 | 160 | case Opt_ssd: |
edf24abe CH |
161 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
162 | btrfs_set_opt(info->mount_opt, SSD); | |
e18e4809 | 163 | break; |
451d7585 CM |
164 | case Opt_ssd_spread: |
165 | printk(KERN_INFO "btrfs: use spread ssd " | |
166 | "allocation scheme\n"); | |
167 | btrfs_set_opt(info->mount_opt, SSD); | |
168 | btrfs_set_opt(info->mount_opt, SSD_SPREAD); | |
169 | break; | |
3b30c22f | 170 | case Opt_nossd: |
451d7585 CM |
171 | printk(KERN_INFO "btrfs: not using ssd allocation " |
172 | "scheme\n"); | |
c289811c | 173 | btrfs_set_opt(info->mount_opt, NOSSD); |
3b30c22f | 174 | btrfs_clear_opt(info->mount_opt, SSD); |
451d7585 | 175 | btrfs_clear_opt(info->mount_opt, SSD_SPREAD); |
3b30c22f | 176 | break; |
21ad10cf | 177 | case Opt_nobarrier: |
edf24abe CH |
178 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
179 | btrfs_set_opt(info->mount_opt, NOBARRIER); | |
21ad10cf | 180 | break; |
4543df7e CM |
181 | case Opt_thread_pool: |
182 | intarg = 0; | |
183 | match_int(&args[0], &intarg); | |
184 | if (intarg) { | |
185 | info->thread_pool_size = intarg; | |
186 | printk(KERN_INFO "btrfs: thread pool %d\n", | |
187 | info->thread_pool_size); | |
188 | } | |
189 | break; | |
6f568d35 | 190 | case Opt_max_inline: |
edf24abe CH |
191 | num = match_strdup(&args[0]); |
192 | if (num) { | |
91748467 | 193 | info->max_inline = memparse(num, NULL); |
edf24abe CH |
194 | kfree(num); |
195 | ||
15ada040 CM |
196 | if (info->max_inline) { |
197 | info->max_inline = max_t(u64, | |
198 | info->max_inline, | |
199 | root->sectorsize); | |
200 | } | |
edf24abe | 201 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
21380931 | 202 | (unsigned long long)info->max_inline); |
6f568d35 CM |
203 | } |
204 | break; | |
8f662a76 | 205 | case Opt_alloc_start: |
edf24abe CH |
206 | num = match_strdup(&args[0]); |
207 | if (num) { | |
91748467 | 208 | info->alloc_start = memparse(num, NULL); |
edf24abe CH |
209 | kfree(num); |
210 | printk(KERN_INFO | |
211 | "btrfs: allocations start at %llu\n", | |
21380931 | 212 | (unsigned long long)info->alloc_start); |
8f662a76 CM |
213 | } |
214 | break; | |
33268eaf JB |
215 | case Opt_noacl: |
216 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
217 | break; | |
3a5e1404 SW |
218 | case Opt_notreelog: |
219 | printk(KERN_INFO "btrfs: disabling tree log\n"); | |
220 | btrfs_set_opt(info->mount_opt, NOTREELOG); | |
221 | break; | |
dccae999 SW |
222 | case Opt_flushoncommit: |
223 | printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); | |
224 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); | |
225 | break; | |
97e728d4 JB |
226 | case Opt_ratio: |
227 | intarg = 0; | |
228 | match_int(&args[0], &intarg); | |
229 | if (intarg) { | |
230 | info->metadata_ratio = intarg; | |
231 | printk(KERN_INFO "btrfs: metadata ratio %d\n", | |
232 | info->metadata_ratio); | |
233 | } | |
234 | break; | |
e244a0ae CH |
235 | case Opt_discard: |
236 | btrfs_set_opt(info->mount_opt, DISCARD); | |
237 | break; | |
a7a3f7ca SW |
238 | case Opt_err: |
239 | printk(KERN_INFO "btrfs: unrecognized mount option " | |
240 | "'%s'\n", p); | |
241 | ret = -EINVAL; | |
242 | goto out; | |
95e05289 | 243 | default: |
be20aa9d | 244 | break; |
95e05289 CM |
245 | } |
246 | } | |
a7a3f7ca | 247 | out: |
da495ecc | 248 | kfree(orig); |
a7a3f7ca | 249 | return ret; |
edf24abe CH |
250 | } |
251 | ||
252 | /* | |
253 | * Parse mount options that are required early in the mount process. | |
254 | * | |
255 | * All other options will be parsed on much later in the mount process and | |
256 | * only when we need to allocate a new super block. | |
257 | */ | |
97288f2c | 258 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
73f73415 | 259 | void *holder, char **subvol_name, u64 *subvol_objectid, |
43e570b0 | 260 | struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
261 | { |
262 | substring_t args[MAX_OPT_ARGS]; | |
263 | char *opts, *p; | |
264 | int error = 0; | |
73f73415 | 265 | int intarg; |
edf24abe CH |
266 | |
267 | if (!options) | |
268 | goto out; | |
269 | ||
270 | /* | |
271 | * strsep changes the string, duplicate it because parse_options | |
272 | * gets called twice | |
273 | */ | |
274 | opts = kstrdup(options, GFP_KERNEL); | |
275 | if (!opts) | |
276 | return -ENOMEM; | |
277 | ||
278 | while ((p = strsep(&opts, ",")) != NULL) { | |
279 | int token; | |
280 | if (!*p) | |
281 | continue; | |
282 | ||
283 | token = match_token(p, tokens, args); | |
284 | switch (token) { | |
285 | case Opt_subvol: | |
286 | *subvol_name = match_strdup(&args[0]); | |
287 | break; | |
73f73415 JB |
288 | case Opt_subvolid: |
289 | intarg = 0; | |
4849f01d JB |
290 | error = match_int(&args[0], &intarg); |
291 | if (!error) { | |
292 | /* we want the original fs_tree */ | |
293 | if (!intarg) | |
294 | *subvol_objectid = | |
295 | BTRFS_FS_TREE_OBJECTID; | |
296 | else | |
297 | *subvol_objectid = intarg; | |
298 | } | |
73f73415 | 299 | break; |
43e570b0 CH |
300 | case Opt_device: |
301 | error = btrfs_scan_one_device(match_strdup(&args[0]), | |
302 | flags, holder, fs_devices); | |
303 | if (error) | |
304 | goto out_free_opts; | |
305 | break; | |
edf24abe CH |
306 | default: |
307 | break; | |
308 | } | |
309 | } | |
310 | ||
43e570b0 | 311 | out_free_opts: |
edf24abe CH |
312 | kfree(opts); |
313 | out: | |
314 | /* | |
315 | * If no subvolume name is specified we use the default one. Allocate | |
3de4586c | 316 | * a copy of the string "." here so that code later in the |
edf24abe CH |
317 | * mount path doesn't care if it's the default volume or another one. |
318 | */ | |
319 | if (!*subvol_name) { | |
3de4586c | 320 | *subvol_name = kstrdup(".", GFP_KERNEL); |
edf24abe CH |
321 | if (!*subvol_name) |
322 | return -ENOMEM; | |
323 | } | |
324 | return error; | |
95e05289 CM |
325 | } |
326 | ||
73f73415 JB |
327 | static struct dentry *get_default_root(struct super_block *sb, |
328 | u64 subvol_objectid) | |
329 | { | |
330 | struct btrfs_root *root = sb->s_fs_info; | |
331 | struct btrfs_root *new_root; | |
332 | struct btrfs_dir_item *di; | |
333 | struct btrfs_path *path; | |
334 | struct btrfs_key location; | |
335 | struct inode *inode; | |
336 | struct dentry *dentry; | |
337 | u64 dir_id; | |
338 | int new = 0; | |
339 | ||
340 | /* | |
341 | * We have a specific subvol we want to mount, just setup location and | |
342 | * go look up the root. | |
343 | */ | |
344 | if (subvol_objectid) { | |
345 | location.objectid = subvol_objectid; | |
346 | location.type = BTRFS_ROOT_ITEM_KEY; | |
347 | location.offset = (u64)-1; | |
348 | goto find_root; | |
349 | } | |
350 | ||
351 | path = btrfs_alloc_path(); | |
352 | if (!path) | |
353 | return ERR_PTR(-ENOMEM); | |
354 | path->leave_spinning = 1; | |
355 | ||
356 | /* | |
357 | * Find the "default" dir item which points to the root item that we | |
358 | * will mount by default if we haven't been given a specific subvolume | |
359 | * to mount. | |
360 | */ | |
361 | dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); | |
362 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); | |
fb4f6f91 DC |
363 | if (IS_ERR(di)) |
364 | return ERR_CAST(di); | |
73f73415 JB |
365 | if (!di) { |
366 | /* | |
367 | * Ok the default dir item isn't there. This is weird since | |
368 | * it's always been there, but don't freak out, just try and | |
369 | * mount to root most subvolume. | |
370 | */ | |
371 | btrfs_free_path(path); | |
372 | dir_id = BTRFS_FIRST_FREE_OBJECTID; | |
373 | new_root = root->fs_info->fs_root; | |
374 | goto setup_root; | |
375 | } | |
376 | ||
377 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
378 | btrfs_free_path(path); | |
379 | ||
380 | find_root: | |
381 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
382 | if (IS_ERR(new_root)) | |
383 | return ERR_PTR(PTR_ERR(new_root)); | |
384 | ||
385 | if (btrfs_root_refs(&new_root->root_item) == 0) | |
386 | return ERR_PTR(-ENOENT); | |
387 | ||
388 | dir_id = btrfs_root_dirid(&new_root->root_item); | |
389 | setup_root: | |
390 | location.objectid = dir_id; | |
391 | location.type = BTRFS_INODE_ITEM_KEY; | |
392 | location.offset = 0; | |
393 | ||
394 | inode = btrfs_iget(sb, &location, new_root, &new); | |
395 | if (!inode) | |
396 | return ERR_PTR(-ENOMEM); | |
397 | ||
398 | /* | |
399 | * If we're just mounting the root most subvol put the inode and return | |
400 | * a reference to the dentry. We will have already gotten a reference | |
401 | * to the inode in btrfs_fill_super so we're good to go. | |
402 | */ | |
403 | if (!new && sb->s_root->d_inode == inode) { | |
404 | iput(inode); | |
405 | return dget(sb->s_root); | |
406 | } | |
407 | ||
408 | if (new) { | |
409 | const struct qstr name = { .name = "/", .len = 1 }; | |
410 | ||
411 | /* | |
412 | * New inode, we need to make the dentry a sibling of s_root so | |
413 | * everything gets cleaned up properly on unmount. | |
414 | */ | |
415 | dentry = d_alloc(sb->s_root, &name); | |
416 | if (!dentry) { | |
417 | iput(inode); | |
418 | return ERR_PTR(-ENOMEM); | |
419 | } | |
420 | d_splice_alias(inode, dentry); | |
421 | } else { | |
422 | /* | |
423 | * We found the inode in cache, just find a dentry for it and | |
424 | * put the reference to the inode we just got. | |
425 | */ | |
426 | dentry = d_find_alias(inode); | |
427 | iput(inode); | |
428 | } | |
429 | ||
430 | return dentry; | |
431 | } | |
432 | ||
d397712b | 433 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 434 | struct btrfs_fs_devices *fs_devices, |
d397712b | 435 | void *data, int silent) |
75dfe396 | 436 | { |
d397712b CM |
437 | struct inode *inode; |
438 | struct dentry *root_dentry; | |
39279cc3 CM |
439 | struct btrfs_super_block *disk_super; |
440 | struct btrfs_root *tree_root; | |
5d4f98a2 | 441 | struct btrfs_key key; |
39279cc3 | 442 | int err; |
a429e513 | 443 | |
39279cc3 CM |
444 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
445 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
446 | sb->s_op = &btrfs_super_ops; | |
be6e8dc0 | 447 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 448 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 449 | sb->s_time_gran = 1; |
0eda294d | 450 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 451 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 452 | #endif |
a429e513 | 453 | |
dfe25020 | 454 | tree_root = open_ctree(sb, fs_devices, (char *)data); |
6567e837 | 455 | |
e58ca020 | 456 | if (IS_ERR(tree_root)) { |
39279cc3 | 457 | printk("btrfs: open_ctree failed\n"); |
e58ca020 | 458 | return PTR_ERR(tree_root); |
a429e513 | 459 | } |
39279cc3 | 460 | sb->s_fs_info = tree_root; |
5f39d397 | 461 | disk_super = &tree_root->fs_info->super_copy; |
a429e513 | 462 | |
5d4f98a2 YZ |
463 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
464 | key.type = BTRFS_INODE_ITEM_KEY; | |
465 | key.offset = 0; | |
73f73415 | 466 | inode = btrfs_iget(sb, &key, tree_root->fs_info->fs_root, NULL); |
5d4f98a2 YZ |
467 | if (IS_ERR(inode)) { |
468 | err = PTR_ERR(inode); | |
39279cc3 | 469 | goto fail_close; |
f254e52c | 470 | } |
f254e52c | 471 | |
39279cc3 CM |
472 | root_dentry = d_alloc_root(inode); |
473 | if (!root_dentry) { | |
474 | iput(inode); | |
475 | err = -ENOMEM; | |
476 | goto fail_close; | |
f254e52c | 477 | } |
58176a96 | 478 | |
39279cc3 | 479 | sb->s_root = root_dentry; |
6885f308 | 480 | |
6885f308 | 481 | save_mount_options(sb, data); |
2619ba1f | 482 | return 0; |
39279cc3 CM |
483 | |
484 | fail_close: | |
485 | close_ctree(tree_root); | |
486 | return err; | |
2619ba1f CM |
487 | } |
488 | ||
6bf13c0c | 489 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
490 | { |
491 | struct btrfs_trans_handle *trans; | |
dccae999 | 492 | struct btrfs_root *root = btrfs_sb(sb); |
c5739bba | 493 | int ret; |
2619ba1f | 494 | |
39279cc3 CM |
495 | if (!wait) { |
496 | filemap_flush(root->fs_info->btree_inode->i_mapping); | |
497 | return 0; | |
498 | } | |
771ed689 | 499 | |
24bbcf04 YZ |
500 | btrfs_start_delalloc_inodes(root, 0); |
501 | btrfs_wait_ordered_extents(root, 0, 0); | |
771ed689 | 502 | |
a22285a6 | 503 | trans = btrfs_start_transaction(root, 0); |
c5739bba | 504 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d | 505 | return ret; |
2c90e5d6 CM |
506 | } |
507 | ||
a9572a15 EP |
508 | static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
509 | { | |
510 | struct btrfs_root *root = btrfs_sb(vfs->mnt_sb); | |
511 | struct btrfs_fs_info *info = root->fs_info; | |
512 | ||
513 | if (btrfs_test_opt(root, DEGRADED)) | |
514 | seq_puts(seq, ",degraded"); | |
515 | if (btrfs_test_opt(root, NODATASUM)) | |
516 | seq_puts(seq, ",nodatasum"); | |
517 | if (btrfs_test_opt(root, NODATACOW)) | |
518 | seq_puts(seq, ",nodatacow"); | |
519 | if (btrfs_test_opt(root, NOBARRIER)) | |
520 | seq_puts(seq, ",nobarrier"); | |
a9572a15 | 521 | if (info->max_inline != 8192 * 1024) |
21380931 JB |
522 | seq_printf(seq, ",max_inline=%llu", |
523 | (unsigned long long)info->max_inline); | |
a9572a15 | 524 | if (info->alloc_start != 0) |
21380931 JB |
525 | seq_printf(seq, ",alloc_start=%llu", |
526 | (unsigned long long)info->alloc_start); | |
a9572a15 EP |
527 | if (info->thread_pool_size != min_t(unsigned long, |
528 | num_online_cpus() + 2, 8)) | |
529 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
530 | if (btrfs_test_opt(root, COMPRESS)) | |
531 | seq_puts(seq, ",compress"); | |
c289811c CM |
532 | if (btrfs_test_opt(root, NOSSD)) |
533 | seq_puts(seq, ",nossd"); | |
451d7585 CM |
534 | if (btrfs_test_opt(root, SSD_SPREAD)) |
535 | seq_puts(seq, ",ssd_spread"); | |
536 | else if (btrfs_test_opt(root, SSD)) | |
a9572a15 | 537 | seq_puts(seq, ",ssd"); |
3a5e1404 | 538 | if (btrfs_test_opt(root, NOTREELOG)) |
6b65c5c6 | 539 | seq_puts(seq, ",notreelog"); |
dccae999 | 540 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
6b65c5c6 | 541 | seq_puts(seq, ",flushoncommit"); |
20a5239a MW |
542 | if (btrfs_test_opt(root, DISCARD)) |
543 | seq_puts(seq, ",discard"); | |
a9572a15 EP |
544 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
545 | seq_puts(seq, ",noacl"); | |
546 | return 0; | |
547 | } | |
548 | ||
a061fc8d | 549 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 550 | { |
a061fc8d CM |
551 | struct btrfs_fs_devices *test_fs_devices = data; |
552 | struct btrfs_root *root = btrfs_sb(s); | |
4b82d6e4 | 553 | |
a061fc8d | 554 | return root->fs_info->fs_devices == test_fs_devices; |
4b82d6e4 Y |
555 | } |
556 | ||
edf24abe CH |
557 | /* |
558 | * Find a superblock for the given device / mount point. | |
559 | * | |
560 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
561 | * for multiple device setup. Make sure to keep it in sync. | |
562 | */ | |
563 | static int btrfs_get_sb(struct file_system_type *fs_type, int flags, | |
564 | const char *dev_name, void *data, struct vfsmount *mnt) | |
4b82d6e4 Y |
565 | { |
566 | struct block_device *bdev = NULL; | |
567 | struct super_block *s; | |
568 | struct dentry *root; | |
8a4b83cc | 569 | struct btrfs_fs_devices *fs_devices = NULL; |
97288f2c | 570 | fmode_t mode = FMODE_READ; |
73f73415 JB |
571 | char *subvol_name = NULL; |
572 | u64 subvol_objectid = 0; | |
4b82d6e4 | 573 | int error = 0; |
73f73415 | 574 | int found = 0; |
4b82d6e4 | 575 | |
97288f2c CH |
576 | if (!(flags & MS_RDONLY)) |
577 | mode |= FMODE_WRITE; | |
578 | ||
579 | error = btrfs_parse_early_options(data, mode, fs_type, | |
73f73415 JB |
580 | &subvol_name, &subvol_objectid, |
581 | &fs_devices); | |
edf24abe | 582 | if (error) |
1f483660 | 583 | return error; |
edf24abe | 584 | |
97288f2c | 585 | error = btrfs_scan_one_device(dev_name, mode, fs_type, &fs_devices); |
8a4b83cc | 586 | if (error) |
edf24abe | 587 | goto error_free_subvol_name; |
4b82d6e4 | 588 | |
97288f2c | 589 | error = btrfs_open_devices(fs_devices, mode, fs_type); |
8a4b83cc | 590 | if (error) |
edf24abe | 591 | goto error_free_subvol_name; |
8a4b83cc | 592 | |
2b82032c YZ |
593 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { |
594 | error = -EACCES; | |
595 | goto error_close_devices; | |
596 | } | |
597 | ||
dfe25020 | 598 | bdev = fs_devices->latest_bdev; |
a061fc8d | 599 | s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices); |
4b82d6e4 Y |
600 | if (IS_ERR(s)) |
601 | goto error_s; | |
602 | ||
603 | if (s->s_root) { | |
604 | if ((flags ^ s->s_flags) & MS_RDONLY) { | |
6f5bbff9 | 605 | deactivate_locked_super(s); |
4b82d6e4 | 606 | error = -EBUSY; |
c146afad | 607 | goto error_close_devices; |
4b82d6e4 Y |
608 | } |
609 | ||
73f73415 | 610 | found = 1; |
2b82032c | 611 | btrfs_close_devices(fs_devices); |
4b82d6e4 Y |
612 | } else { |
613 | char b[BDEVNAME_SIZE]; | |
614 | ||
615 | s->s_flags = flags; | |
616 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); | |
8a4b83cc CM |
617 | error = btrfs_fill_super(s, fs_devices, data, |
618 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 | 619 | if (error) { |
6f5bbff9 | 620 | deactivate_locked_super(s); |
1f483660 | 621 | goto error_free_subvol_name; |
4b82d6e4 Y |
622 | } |
623 | ||
788f20eb | 624 | btrfs_sb(s)->fs_info->bdev_holder = fs_type; |
4b82d6e4 Y |
625 | s->s_flags |= MS_ACTIVE; |
626 | } | |
627 | ||
73f73415 JB |
628 | root = get_default_root(s, subvol_objectid); |
629 | if (IS_ERR(root)) { | |
630 | error = PTR_ERR(root); | |
631 | deactivate_locked_super(s); | |
632 | goto error; | |
633 | } | |
634 | /* if they gave us a subvolume name bind mount into that */ | |
635 | if (strcmp(subvol_name, ".")) { | |
636 | struct dentry *new_root; | |
637 | mutex_lock(&root->d_inode->i_mutex); | |
638 | new_root = lookup_one_len(subvol_name, root, | |
d397712b | 639 | strlen(subvol_name)); |
73f73415 | 640 | mutex_unlock(&root->d_inode->i_mutex); |
d397712b | 641 | |
73f73415 | 642 | if (IS_ERR(new_root)) { |
6f5bbff9 | 643 | deactivate_locked_super(s); |
73f73415 JB |
644 | error = PTR_ERR(new_root); |
645 | dput(root); | |
646 | goto error_close_devices; | |
76fcef19 | 647 | } |
73f73415 | 648 | if (!new_root->d_inode) { |
76fcef19 | 649 | dput(root); |
73f73415 | 650 | dput(new_root); |
6f5bbff9 | 651 | deactivate_locked_super(s); |
76fcef19 | 652 | error = -ENXIO; |
73f73415 | 653 | goto error_close_devices; |
76fcef19 | 654 | } |
73f73415 JB |
655 | dput(root); |
656 | root = new_root; | |
4b82d6e4 Y |
657 | } |
658 | ||
659 | mnt->mnt_sb = s; | |
660 | mnt->mnt_root = root; | |
edf24abe CH |
661 | |
662 | kfree(subvol_name); | |
4b82d6e4 Y |
663 | return 0; |
664 | ||
665 | error_s: | |
666 | error = PTR_ERR(s); | |
c146afad | 667 | error_close_devices: |
8a4b83cc | 668 | btrfs_close_devices(fs_devices); |
edf24abe CH |
669 | error_free_subvol_name: |
670 | kfree(subvol_name); | |
73f73415 | 671 | error: |
4b82d6e4 Y |
672 | return error; |
673 | } | |
2e635a27 | 674 | |
c146afad YZ |
675 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
676 | { | |
677 | struct btrfs_root *root = btrfs_sb(sb); | |
678 | int ret; | |
679 | ||
b288052e CM |
680 | ret = btrfs_parse_options(root, data); |
681 | if (ret) | |
682 | return -EINVAL; | |
683 | ||
c146afad YZ |
684 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
685 | return 0; | |
686 | ||
687 | if (*flags & MS_RDONLY) { | |
688 | sb->s_flags |= MS_RDONLY; | |
689 | ||
690 | ret = btrfs_commit_super(root); | |
691 | WARN_ON(ret); | |
692 | } else { | |
2b82032c YZ |
693 | if (root->fs_info->fs_devices->rw_devices == 0) |
694 | return -EACCES; | |
695 | ||
c146afad YZ |
696 | if (btrfs_super_log_root(&root->fs_info->super_copy) != 0) |
697 | return -EINVAL; | |
698 | ||
d68fc57b | 699 | ret = btrfs_cleanup_fs_roots(root->fs_info); |
c146afad YZ |
700 | WARN_ON(ret); |
701 | ||
d68fc57b YZ |
702 | /* recover relocation */ |
703 | ret = btrfs_recover_relocation(root); | |
c146afad YZ |
704 | WARN_ON(ret); |
705 | ||
706 | sb->s_flags &= ~MS_RDONLY; | |
707 | } | |
708 | ||
709 | return 0; | |
710 | } | |
711 | ||
8fd17795 CM |
712 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
713 | { | |
714 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
4b52dff6 | 715 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
bd4d1088 JB |
716 | struct list_head *head = &root->fs_info->space_info; |
717 | struct btrfs_space_info *found; | |
718 | u64 total_used = 0; | |
db94535d | 719 | int bits = dentry->d_sb->s_blocksize_bits; |
9d03632e | 720 | __be32 *fsid = (__be32 *)root->fs_info->fsid; |
8fd17795 | 721 | |
bd4d1088 | 722 | rcu_read_lock(); |
b742bb82 YZ |
723 | list_for_each_entry_rcu(found, head, list) |
724 | total_used += found->disk_used; | |
bd4d1088 JB |
725 | rcu_read_unlock(); |
726 | ||
8fd17795 | 727 | buf->f_namelen = BTRFS_NAME_LEN; |
db94535d | 728 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
bd4d1088 | 729 | buf->f_bfree = buf->f_blocks - (total_used >> bits); |
b742bb82 | 730 | buf->f_bavail = buf->f_bfree; |
8fd17795 CM |
731 | buf->f_bsize = dentry->d_sb->s_blocksize; |
732 | buf->f_type = BTRFS_SUPER_MAGIC; | |
d397712b | 733 | |
9d03632e | 734 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 735 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
736 | on a big-endian or little-endian host */ |
737 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
738 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 DW |
739 | /* Mask in the root object ID too, to disambiguate subvols */ |
740 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; | |
741 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; | |
742 | ||
8fd17795 CM |
743 | return 0; |
744 | } | |
b5133862 | 745 | |
2e635a27 CM |
746 | static struct file_system_type btrfs_fs_type = { |
747 | .owner = THIS_MODULE, | |
748 | .name = "btrfs", | |
749 | .get_sb = btrfs_get_sb, | |
a061fc8d | 750 | .kill_sb = kill_anon_super, |
2e635a27 CM |
751 | .fs_flags = FS_REQUIRES_DEV, |
752 | }; | |
a9218f6b | 753 | |
d352ac68 CM |
754 | /* |
755 | * used by btrfsctl to scan devices when no FS is mounted | |
756 | */ | |
8a4b83cc CM |
757 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
758 | unsigned long arg) | |
759 | { | |
760 | struct btrfs_ioctl_vol_args *vol; | |
761 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 762 | int ret = -ENOTTY; |
8a4b83cc | 763 | |
e441d54d CM |
764 | if (!capable(CAP_SYS_ADMIN)) |
765 | return -EPERM; | |
766 | ||
dae7b665 LZ |
767 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
768 | if (IS_ERR(vol)) | |
769 | return PTR_ERR(vol); | |
c071fcfd | 770 | |
8a4b83cc CM |
771 | switch (cmd) { |
772 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 773 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
774 | &btrfs_fs_type, &fs_devices); |
775 | break; | |
776 | } | |
dae7b665 | 777 | |
8a4b83cc | 778 | kfree(vol); |
f819d837 | 779 | return ret; |
8a4b83cc CM |
780 | } |
781 | ||
0176260f | 782 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b Y |
783 | { |
784 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
785 | mutex_lock(&root->fs_info->transaction_kthread_mutex); |
786 | mutex_lock(&root->fs_info->cleaner_mutex); | |
0176260f | 787 | return 0; |
ed0dab6b Y |
788 | } |
789 | ||
0176260f | 790 | static int btrfs_unfreeze(struct super_block *sb) |
ed0dab6b Y |
791 | { |
792 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
793 | mutex_unlock(&root->fs_info->cleaner_mutex); |
794 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
0176260f | 795 | return 0; |
ed0dab6b | 796 | } |
2e635a27 | 797 | |
b87221de | 798 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 799 | .drop_inode = btrfs_drop_inode, |
134e9731 | 800 | .delete_inode = btrfs_delete_inode, |
e20d96d6 | 801 | .put_super = btrfs_put_super, |
d5719762 | 802 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 803 | .show_options = btrfs_show_options, |
4730a4bc | 804 | .write_inode = btrfs_write_inode, |
b5133862 | 805 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
806 | .alloc_inode = btrfs_alloc_inode, |
807 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 808 | .statfs = btrfs_statfs, |
c146afad | 809 | .remount_fs = btrfs_remount, |
0176260f LT |
810 | .freeze_fs = btrfs_freeze, |
811 | .unfreeze_fs = btrfs_unfreeze, | |
e20d96d6 | 812 | }; |
a9218f6b CM |
813 | |
814 | static const struct file_operations btrfs_ctl_fops = { | |
815 | .unlocked_ioctl = btrfs_control_ioctl, | |
816 | .compat_ioctl = btrfs_control_ioctl, | |
817 | .owner = THIS_MODULE, | |
818 | }; | |
819 | ||
820 | static struct miscdevice btrfs_misc = { | |
821 | .minor = MISC_DYNAMIC_MINOR, | |
822 | .name = "btrfs-control", | |
823 | .fops = &btrfs_ctl_fops | |
824 | }; | |
825 | ||
826 | static int btrfs_interface_init(void) | |
827 | { | |
828 | return misc_register(&btrfs_misc); | |
829 | } | |
830 | ||
b2950863 | 831 | static void btrfs_interface_exit(void) |
a9218f6b CM |
832 | { |
833 | if (misc_deregister(&btrfs_misc) < 0) | |
d397712b | 834 | printk(KERN_INFO "misc_deregister failed for control device"); |
a9218f6b CM |
835 | } |
836 | ||
2e635a27 CM |
837 | static int __init init_btrfs_fs(void) |
838 | { | |
2c90e5d6 | 839 | int err; |
58176a96 JB |
840 | |
841 | err = btrfs_init_sysfs(); | |
842 | if (err) | |
843 | return err; | |
844 | ||
39279cc3 | 845 | err = btrfs_init_cachep(); |
2c90e5d6 | 846 | if (err) |
a74a4b97 | 847 | goto free_sysfs; |
d1310b2e CM |
848 | |
849 | err = extent_io_init(); | |
2f4cbe64 WB |
850 | if (err) |
851 | goto free_cachep; | |
852 | ||
d1310b2e CM |
853 | err = extent_map_init(); |
854 | if (err) | |
855 | goto free_extent_io; | |
856 | ||
a9218f6b | 857 | err = btrfs_interface_init(); |
2f4cbe64 WB |
858 | if (err) |
859 | goto free_extent_map; | |
c8b97818 | 860 | |
a9218f6b CM |
861 | err = register_filesystem(&btrfs_fs_type); |
862 | if (err) | |
863 | goto unregister_ioctl; | |
b3c3da71 CM |
864 | |
865 | printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); | |
2f4cbe64 WB |
866 | return 0; |
867 | ||
a9218f6b CM |
868 | unregister_ioctl: |
869 | btrfs_interface_exit(); | |
2f4cbe64 WB |
870 | free_extent_map: |
871 | extent_map_exit(); | |
d1310b2e CM |
872 | free_extent_io: |
873 | extent_io_exit(); | |
2f4cbe64 WB |
874 | free_cachep: |
875 | btrfs_destroy_cachep(); | |
a74a4b97 | 876 | free_sysfs: |
2f4cbe64 WB |
877 | btrfs_exit_sysfs(); |
878 | return err; | |
2e635a27 CM |
879 | } |
880 | ||
881 | static void __exit exit_btrfs_fs(void) | |
882 | { | |
39279cc3 | 883 | btrfs_destroy_cachep(); |
a52d9a80 | 884 | extent_map_exit(); |
d1310b2e | 885 | extent_io_exit(); |
a9218f6b | 886 | btrfs_interface_exit(); |
2e635a27 | 887 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 888 | btrfs_exit_sysfs(); |
8a4b83cc | 889 | btrfs_cleanup_fs_uuids(); |
c8b97818 | 890 | btrfs_zlib_exit(); |
2e635a27 CM |
891 | } |
892 | ||
893 | module_init(init_btrfs_fs) | |
894 | module_exit(exit_btrfs_fs) | |
895 | ||
896 | MODULE_LICENSE("GPL"); |