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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> |
4b4e25f2 | 41 | #include "compat.h" |
2e635a27 | 42 | #include "ctree.h" |
e20d96d6 | 43 | #include "disk-io.h" |
d5719762 | 44 | #include "transaction.h" |
2c90e5d6 | 45 | #include "btrfs_inode.h" |
c5739bba | 46 | #include "ioctl.h" |
3a686375 | 47 | #include "print-tree.h" |
5103e947 | 48 | #include "xattr.h" |
8a4b83cc | 49 | #include "volumes.h" |
b3c3da71 | 50 | #include "version.h" |
be6e8dc0 | 51 | #include "export.h" |
c8b97818 | 52 | #include "compression.h" |
2e635a27 | 53 | |
b87221de | 54 | static const struct super_operations btrfs_super_ops; |
75dfe396 | 55 | |
d397712b | 56 | static void btrfs_put_super(struct super_block *sb) |
b18c6685 | 57 | { |
39279cc3 | 58 | struct btrfs_root *root = btrfs_sb(sb); |
b18c6685 | 59 | int ret; |
b18c6685 | 60 | |
39279cc3 | 61 | ret = close_ctree(root); |
39279cc3 | 62 | sb->s_fs_info = NULL; |
75dfe396 CM |
63 | } |
64 | ||
95e05289 | 65 | enum { |
73f73415 JB |
66 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
67 | Opt_nodatacow, Opt_max_extent, Opt_max_inline, Opt_alloc_start, | |
68 | Opt_nobarrier, Opt_ssd, Opt_nossd, Opt_ssd_spread, Opt_thread_pool, | |
69 | Opt_noacl, Opt_compress, Opt_compress_force, Opt_notreelog, Opt_ratio, | |
a555f810 | 70 | 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"}, |
c59f8951 | 82 | {Opt_max_extent, "max_extent=%s"}, |
6f568d35 | 83 | {Opt_max_inline, "max_inline=%s"}, |
8f662a76 | 84 | {Opt_alloc_start, "alloc_start=%s"}, |
4543df7e | 85 | {Opt_thread_pool, "thread_pool=%d"}, |
c8b97818 | 86 | {Opt_compress, "compress"}, |
a555f810 | 87 | {Opt_compress_force, "compress-force"}, |
e18e4809 | 88 | {Opt_ssd, "ssd"}, |
451d7585 | 89 | {Opt_ssd_spread, "ssd_spread"}, |
3b30c22f | 90 | {Opt_nossd, "nossd"}, |
33268eaf | 91 | {Opt_noacl, "noacl"}, |
3a5e1404 | 92 | {Opt_notreelog, "notreelog"}, |
dccae999 | 93 | {Opt_flushoncommit, "flushoncommit"}, |
97e728d4 | 94 | {Opt_ratio, "metadata_ratio=%d"}, |
e244a0ae | 95 | {Opt_discard, "discard"}, |
33268eaf | 96 | {Opt_err, NULL}, |
95e05289 CM |
97 | }; |
98 | ||
edbd8d4e | 99 | u64 btrfs_parse_size(char *str) |
c59f8951 | 100 | { |
edbd8d4e | 101 | u64 res; |
c59f8951 CM |
102 | int mult = 1; |
103 | char *end; | |
104 | char last; | |
105 | ||
106 | res = simple_strtoul(str, &end, 10); | |
107 | ||
108 | last = end[0]; | |
109 | if (isalpha(last)) { | |
110 | last = tolower(last); | |
111 | switch (last) { | |
112 | case 'g': | |
113 | mult *= 1024; | |
114 | case 'm': | |
115 | mult *= 1024; | |
116 | case 'k': | |
117 | mult *= 1024; | |
118 | } | |
119 | res = res * mult; | |
120 | } | |
121 | return res; | |
122 | } | |
123 | ||
edf24abe CH |
124 | /* |
125 | * Regular mount options parser. Everything that is needed only when | |
126 | * reading in a new superblock is parsed here. | |
127 | */ | |
128 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 129 | { |
edf24abe | 130 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 131 | substring_t args[MAX_OPT_ARGS]; |
da495ecc | 132 | char *p, *num, *orig; |
4543df7e | 133 | int intarg; |
a7a3f7ca | 134 | int ret = 0; |
b6cda9bc | 135 | |
95e05289 | 136 | if (!options) |
edf24abe | 137 | return 0; |
95e05289 | 138 | |
be20aa9d CM |
139 | /* |
140 | * strsep changes the string, duplicate it because parse_options | |
141 | * gets called twice | |
142 | */ | |
143 | options = kstrdup(options, GFP_NOFS); | |
144 | if (!options) | |
145 | return -ENOMEM; | |
146 | ||
da495ecc | 147 | orig = options; |
be20aa9d | 148 | |
edf24abe | 149 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
150 | int token; |
151 | if (!*p) | |
152 | continue; | |
153 | ||
154 | token = match_token(p, tokens, args); | |
155 | switch (token) { | |
dfe25020 | 156 | case Opt_degraded: |
edf24abe CH |
157 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
158 | btrfs_set_opt(info->mount_opt, DEGRADED); | |
dfe25020 | 159 | break; |
95e05289 | 160 | case Opt_subvol: |
73f73415 | 161 | case Opt_subvolid: |
43e570b0 | 162 | case Opt_device: |
edf24abe | 163 | /* |
43e570b0 | 164 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
165 | * and can be happily ignored here. |
166 | */ | |
b6cda9bc CM |
167 | break; |
168 | case Opt_nodatasum: | |
067c28ad | 169 | printk(KERN_INFO "btrfs: setting nodatasum\n"); |
edf24abe | 170 | btrfs_set_opt(info->mount_opt, NODATASUM); |
be20aa9d CM |
171 | break; |
172 | case Opt_nodatacow: | |
edf24abe CH |
173 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
174 | btrfs_set_opt(info->mount_opt, NODATACOW); | |
175 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 176 | break; |
c8b97818 CM |
177 | case Opt_compress: |
178 | printk(KERN_INFO "btrfs: use compression\n"); | |
179 | btrfs_set_opt(info->mount_opt, COMPRESS); | |
180 | break; | |
a555f810 CM |
181 | case Opt_compress_force: |
182 | printk(KERN_INFO "btrfs: forcing compression\n"); | |
183 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); | |
184 | btrfs_set_opt(info->mount_opt, COMPRESS); | |
185 | break; | |
e18e4809 | 186 | case Opt_ssd: |
edf24abe CH |
187 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
188 | btrfs_set_opt(info->mount_opt, SSD); | |
e18e4809 | 189 | break; |
451d7585 CM |
190 | case Opt_ssd_spread: |
191 | printk(KERN_INFO "btrfs: use spread ssd " | |
192 | "allocation scheme\n"); | |
193 | btrfs_set_opt(info->mount_opt, SSD); | |
194 | btrfs_set_opt(info->mount_opt, SSD_SPREAD); | |
195 | break; | |
3b30c22f | 196 | case Opt_nossd: |
451d7585 CM |
197 | printk(KERN_INFO "btrfs: not using ssd allocation " |
198 | "scheme\n"); | |
c289811c | 199 | btrfs_set_opt(info->mount_opt, NOSSD); |
3b30c22f | 200 | btrfs_clear_opt(info->mount_opt, SSD); |
451d7585 | 201 | btrfs_clear_opt(info->mount_opt, SSD_SPREAD); |
3b30c22f | 202 | break; |
21ad10cf | 203 | case Opt_nobarrier: |
edf24abe CH |
204 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
205 | btrfs_set_opt(info->mount_opt, NOBARRIER); | |
21ad10cf | 206 | break; |
4543df7e CM |
207 | case Opt_thread_pool: |
208 | intarg = 0; | |
209 | match_int(&args[0], &intarg); | |
210 | if (intarg) { | |
211 | info->thread_pool_size = intarg; | |
212 | printk(KERN_INFO "btrfs: thread pool %d\n", | |
213 | info->thread_pool_size); | |
214 | } | |
215 | break; | |
c59f8951 | 216 | case Opt_max_extent: |
edf24abe CH |
217 | num = match_strdup(&args[0]); |
218 | if (num) { | |
219 | info->max_extent = btrfs_parse_size(num); | |
220 | kfree(num); | |
221 | ||
222 | info->max_extent = max_t(u64, | |
223 | info->max_extent, root->sectorsize); | |
224 | printk(KERN_INFO "btrfs: max_extent at %llu\n", | |
21380931 | 225 | (unsigned long long)info->max_extent); |
c59f8951 CM |
226 | } |
227 | break; | |
6f568d35 | 228 | case Opt_max_inline: |
edf24abe CH |
229 | num = match_strdup(&args[0]); |
230 | if (num) { | |
231 | info->max_inline = btrfs_parse_size(num); | |
232 | kfree(num); | |
233 | ||
15ada040 CM |
234 | if (info->max_inline) { |
235 | info->max_inline = max_t(u64, | |
236 | info->max_inline, | |
237 | root->sectorsize); | |
238 | } | |
edf24abe | 239 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
21380931 | 240 | (unsigned long long)info->max_inline); |
6f568d35 CM |
241 | } |
242 | break; | |
8f662a76 | 243 | case Opt_alloc_start: |
edf24abe CH |
244 | num = match_strdup(&args[0]); |
245 | if (num) { | |
246 | info->alloc_start = btrfs_parse_size(num); | |
247 | kfree(num); | |
248 | printk(KERN_INFO | |
249 | "btrfs: allocations start at %llu\n", | |
21380931 | 250 | (unsigned long long)info->alloc_start); |
8f662a76 CM |
251 | } |
252 | break; | |
33268eaf JB |
253 | case Opt_noacl: |
254 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
255 | break; | |
3a5e1404 SW |
256 | case Opt_notreelog: |
257 | printk(KERN_INFO "btrfs: disabling tree log\n"); | |
258 | btrfs_set_opt(info->mount_opt, NOTREELOG); | |
259 | break; | |
dccae999 SW |
260 | case Opt_flushoncommit: |
261 | printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); | |
262 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); | |
263 | break; | |
97e728d4 JB |
264 | case Opt_ratio: |
265 | intarg = 0; | |
266 | match_int(&args[0], &intarg); | |
267 | if (intarg) { | |
268 | info->metadata_ratio = intarg; | |
269 | printk(KERN_INFO "btrfs: metadata ratio %d\n", | |
270 | info->metadata_ratio); | |
271 | } | |
272 | break; | |
e244a0ae CH |
273 | case Opt_discard: |
274 | btrfs_set_opt(info->mount_opt, DISCARD); | |
275 | break; | |
a7a3f7ca SW |
276 | case Opt_err: |
277 | printk(KERN_INFO "btrfs: unrecognized mount option " | |
278 | "'%s'\n", p); | |
279 | ret = -EINVAL; | |
280 | goto out; | |
95e05289 | 281 | default: |
be20aa9d | 282 | break; |
95e05289 CM |
283 | } |
284 | } | |
a7a3f7ca | 285 | out: |
da495ecc | 286 | kfree(orig); |
a7a3f7ca | 287 | return ret; |
edf24abe CH |
288 | } |
289 | ||
290 | /* | |
291 | * Parse mount options that are required early in the mount process. | |
292 | * | |
293 | * All other options will be parsed on much later in the mount process and | |
294 | * only when we need to allocate a new super block. | |
295 | */ | |
97288f2c | 296 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
73f73415 | 297 | void *holder, char **subvol_name, u64 *subvol_objectid, |
43e570b0 | 298 | struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
299 | { |
300 | substring_t args[MAX_OPT_ARGS]; | |
301 | char *opts, *p; | |
302 | int error = 0; | |
73f73415 | 303 | int intarg; |
edf24abe CH |
304 | |
305 | if (!options) | |
306 | goto out; | |
307 | ||
308 | /* | |
309 | * strsep changes the string, duplicate it because parse_options | |
310 | * gets called twice | |
311 | */ | |
312 | opts = kstrdup(options, GFP_KERNEL); | |
313 | if (!opts) | |
314 | return -ENOMEM; | |
315 | ||
316 | while ((p = strsep(&opts, ",")) != NULL) { | |
317 | int token; | |
318 | if (!*p) | |
319 | continue; | |
320 | ||
321 | token = match_token(p, tokens, args); | |
322 | switch (token) { | |
323 | case Opt_subvol: | |
324 | *subvol_name = match_strdup(&args[0]); | |
325 | break; | |
73f73415 JB |
326 | case Opt_subvolid: |
327 | intarg = 0; | |
4849f01d JB |
328 | error = match_int(&args[0], &intarg); |
329 | if (!error) { | |
330 | /* we want the original fs_tree */ | |
331 | if (!intarg) | |
332 | *subvol_objectid = | |
333 | BTRFS_FS_TREE_OBJECTID; | |
334 | else | |
335 | *subvol_objectid = intarg; | |
336 | } | |
73f73415 | 337 | break; |
43e570b0 CH |
338 | case Opt_device: |
339 | error = btrfs_scan_one_device(match_strdup(&args[0]), | |
340 | flags, holder, fs_devices); | |
341 | if (error) | |
342 | goto out_free_opts; | |
343 | break; | |
edf24abe CH |
344 | default: |
345 | break; | |
346 | } | |
347 | } | |
348 | ||
43e570b0 | 349 | out_free_opts: |
edf24abe CH |
350 | kfree(opts); |
351 | out: | |
352 | /* | |
353 | * If no subvolume name is specified we use the default one. Allocate | |
3de4586c | 354 | * a copy of the string "." here so that code later in the |
edf24abe CH |
355 | * mount path doesn't care if it's the default volume or another one. |
356 | */ | |
357 | if (!*subvol_name) { | |
3de4586c | 358 | *subvol_name = kstrdup(".", GFP_KERNEL); |
edf24abe CH |
359 | if (!*subvol_name) |
360 | return -ENOMEM; | |
361 | } | |
362 | return error; | |
95e05289 CM |
363 | } |
364 | ||
73f73415 JB |
365 | static struct dentry *get_default_root(struct super_block *sb, |
366 | u64 subvol_objectid) | |
367 | { | |
368 | struct btrfs_root *root = sb->s_fs_info; | |
369 | struct btrfs_root *new_root; | |
370 | struct btrfs_dir_item *di; | |
371 | struct btrfs_path *path; | |
372 | struct btrfs_key location; | |
373 | struct inode *inode; | |
374 | struct dentry *dentry; | |
375 | u64 dir_id; | |
376 | int new = 0; | |
377 | ||
378 | /* | |
379 | * We have a specific subvol we want to mount, just setup location and | |
380 | * go look up the root. | |
381 | */ | |
382 | if (subvol_objectid) { | |
383 | location.objectid = subvol_objectid; | |
384 | location.type = BTRFS_ROOT_ITEM_KEY; | |
385 | location.offset = (u64)-1; | |
386 | goto find_root; | |
387 | } | |
388 | ||
389 | path = btrfs_alloc_path(); | |
390 | if (!path) | |
391 | return ERR_PTR(-ENOMEM); | |
392 | path->leave_spinning = 1; | |
393 | ||
394 | /* | |
395 | * Find the "default" dir item which points to the root item that we | |
396 | * will mount by default if we haven't been given a specific subvolume | |
397 | * to mount. | |
398 | */ | |
399 | dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); | |
400 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); | |
401 | if (!di) { | |
402 | /* | |
403 | * Ok the default dir item isn't there. This is weird since | |
404 | * it's always been there, but don't freak out, just try and | |
405 | * mount to root most subvolume. | |
406 | */ | |
407 | btrfs_free_path(path); | |
408 | dir_id = BTRFS_FIRST_FREE_OBJECTID; | |
409 | new_root = root->fs_info->fs_root; | |
410 | goto setup_root; | |
411 | } | |
412 | ||
413 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
414 | btrfs_free_path(path); | |
415 | ||
416 | find_root: | |
417 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
418 | if (IS_ERR(new_root)) | |
419 | return ERR_PTR(PTR_ERR(new_root)); | |
420 | ||
421 | if (btrfs_root_refs(&new_root->root_item) == 0) | |
422 | return ERR_PTR(-ENOENT); | |
423 | ||
424 | dir_id = btrfs_root_dirid(&new_root->root_item); | |
425 | setup_root: | |
426 | location.objectid = dir_id; | |
427 | location.type = BTRFS_INODE_ITEM_KEY; | |
428 | location.offset = 0; | |
429 | ||
430 | inode = btrfs_iget(sb, &location, new_root, &new); | |
431 | if (!inode) | |
432 | return ERR_PTR(-ENOMEM); | |
433 | ||
434 | /* | |
435 | * If we're just mounting the root most subvol put the inode and return | |
436 | * a reference to the dentry. We will have already gotten a reference | |
437 | * to the inode in btrfs_fill_super so we're good to go. | |
438 | */ | |
439 | if (!new && sb->s_root->d_inode == inode) { | |
440 | iput(inode); | |
441 | return dget(sb->s_root); | |
442 | } | |
443 | ||
444 | if (new) { | |
445 | const struct qstr name = { .name = "/", .len = 1 }; | |
446 | ||
447 | /* | |
448 | * New inode, we need to make the dentry a sibling of s_root so | |
449 | * everything gets cleaned up properly on unmount. | |
450 | */ | |
451 | dentry = d_alloc(sb->s_root, &name); | |
452 | if (!dentry) { | |
453 | iput(inode); | |
454 | return ERR_PTR(-ENOMEM); | |
455 | } | |
456 | d_splice_alias(inode, dentry); | |
457 | } else { | |
458 | /* | |
459 | * We found the inode in cache, just find a dentry for it and | |
460 | * put the reference to the inode we just got. | |
461 | */ | |
462 | dentry = d_find_alias(inode); | |
463 | iput(inode); | |
464 | } | |
465 | ||
466 | return dentry; | |
467 | } | |
468 | ||
d397712b | 469 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 470 | struct btrfs_fs_devices *fs_devices, |
d397712b | 471 | void *data, int silent) |
75dfe396 | 472 | { |
d397712b CM |
473 | struct inode *inode; |
474 | struct dentry *root_dentry; | |
39279cc3 CM |
475 | struct btrfs_super_block *disk_super; |
476 | struct btrfs_root *tree_root; | |
5d4f98a2 | 477 | struct btrfs_key key; |
39279cc3 | 478 | int err; |
a429e513 | 479 | |
39279cc3 CM |
480 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
481 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
482 | sb->s_op = &btrfs_super_ops; | |
be6e8dc0 | 483 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 484 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 485 | sb->s_time_gran = 1; |
0eda294d | 486 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 487 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 488 | #endif |
a429e513 | 489 | |
dfe25020 | 490 | tree_root = open_ctree(sb, fs_devices, (char *)data); |
6567e837 | 491 | |
e58ca020 | 492 | if (IS_ERR(tree_root)) { |
39279cc3 | 493 | printk("btrfs: open_ctree failed\n"); |
e58ca020 | 494 | return PTR_ERR(tree_root); |
a429e513 | 495 | } |
39279cc3 | 496 | sb->s_fs_info = tree_root; |
5f39d397 | 497 | disk_super = &tree_root->fs_info->super_copy; |
a429e513 | 498 | |
5d4f98a2 YZ |
499 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
500 | key.type = BTRFS_INODE_ITEM_KEY; | |
501 | key.offset = 0; | |
73f73415 | 502 | inode = btrfs_iget(sb, &key, tree_root->fs_info->fs_root, NULL); |
5d4f98a2 YZ |
503 | if (IS_ERR(inode)) { |
504 | err = PTR_ERR(inode); | |
39279cc3 | 505 | goto fail_close; |
f254e52c | 506 | } |
f254e52c | 507 | |
39279cc3 CM |
508 | root_dentry = d_alloc_root(inode); |
509 | if (!root_dentry) { | |
510 | iput(inode); | |
511 | err = -ENOMEM; | |
512 | goto fail_close; | |
f254e52c | 513 | } |
58176a96 | 514 | |
39279cc3 | 515 | sb->s_root = root_dentry; |
6885f308 | 516 | |
6885f308 | 517 | save_mount_options(sb, data); |
2619ba1f | 518 | return 0; |
39279cc3 CM |
519 | |
520 | fail_close: | |
521 | close_ctree(tree_root); | |
522 | return err; | |
2619ba1f CM |
523 | } |
524 | ||
6bf13c0c | 525 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
526 | { |
527 | struct btrfs_trans_handle *trans; | |
dccae999 | 528 | struct btrfs_root *root = btrfs_sb(sb); |
c5739bba | 529 | int ret; |
2619ba1f | 530 | |
39279cc3 CM |
531 | if (!wait) { |
532 | filemap_flush(root->fs_info->btree_inode->i_mapping); | |
533 | return 0; | |
534 | } | |
771ed689 | 535 | |
24bbcf04 YZ |
536 | btrfs_start_delalloc_inodes(root, 0); |
537 | btrfs_wait_ordered_extents(root, 0, 0); | |
771ed689 | 538 | |
c5739bba | 539 | trans = btrfs_start_transaction(root, 1); |
c5739bba | 540 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d | 541 | return ret; |
2c90e5d6 CM |
542 | } |
543 | ||
a9572a15 EP |
544 | static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
545 | { | |
546 | struct btrfs_root *root = btrfs_sb(vfs->mnt_sb); | |
547 | struct btrfs_fs_info *info = root->fs_info; | |
548 | ||
549 | if (btrfs_test_opt(root, DEGRADED)) | |
550 | seq_puts(seq, ",degraded"); | |
551 | if (btrfs_test_opt(root, NODATASUM)) | |
552 | seq_puts(seq, ",nodatasum"); | |
553 | if (btrfs_test_opt(root, NODATACOW)) | |
554 | seq_puts(seq, ",nodatacow"); | |
555 | if (btrfs_test_opt(root, NOBARRIER)) | |
556 | seq_puts(seq, ",nobarrier"); | |
557 | if (info->max_extent != (u64)-1) | |
21380931 JB |
558 | seq_printf(seq, ",max_extent=%llu", |
559 | (unsigned long long)info->max_extent); | |
a9572a15 | 560 | if (info->max_inline != 8192 * 1024) |
21380931 JB |
561 | seq_printf(seq, ",max_inline=%llu", |
562 | (unsigned long long)info->max_inline); | |
a9572a15 | 563 | if (info->alloc_start != 0) |
21380931 JB |
564 | seq_printf(seq, ",alloc_start=%llu", |
565 | (unsigned long long)info->alloc_start); | |
a9572a15 EP |
566 | if (info->thread_pool_size != min_t(unsigned long, |
567 | num_online_cpus() + 2, 8)) | |
568 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
569 | if (btrfs_test_opt(root, COMPRESS)) | |
570 | seq_puts(seq, ",compress"); | |
c289811c CM |
571 | if (btrfs_test_opt(root, NOSSD)) |
572 | seq_puts(seq, ",nossd"); | |
451d7585 CM |
573 | if (btrfs_test_opt(root, SSD_SPREAD)) |
574 | seq_puts(seq, ",ssd_spread"); | |
575 | else if (btrfs_test_opt(root, SSD)) | |
a9572a15 | 576 | seq_puts(seq, ",ssd"); |
3a5e1404 | 577 | if (btrfs_test_opt(root, NOTREELOG)) |
6b65c5c6 | 578 | seq_puts(seq, ",notreelog"); |
dccae999 | 579 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
6b65c5c6 | 580 | seq_puts(seq, ",flushoncommit"); |
20a5239a MW |
581 | if (btrfs_test_opt(root, DISCARD)) |
582 | seq_puts(seq, ",discard"); | |
a9572a15 EP |
583 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
584 | seq_puts(seq, ",noacl"); | |
585 | return 0; | |
586 | } | |
587 | ||
a061fc8d | 588 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 589 | { |
a061fc8d CM |
590 | struct btrfs_fs_devices *test_fs_devices = data; |
591 | struct btrfs_root *root = btrfs_sb(s); | |
4b82d6e4 | 592 | |
a061fc8d | 593 | return root->fs_info->fs_devices == test_fs_devices; |
4b82d6e4 Y |
594 | } |
595 | ||
edf24abe CH |
596 | /* |
597 | * Find a superblock for the given device / mount point. | |
598 | * | |
599 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
600 | * for multiple device setup. Make sure to keep it in sync. | |
601 | */ | |
602 | static int btrfs_get_sb(struct file_system_type *fs_type, int flags, | |
603 | const char *dev_name, void *data, struct vfsmount *mnt) | |
4b82d6e4 Y |
604 | { |
605 | struct block_device *bdev = NULL; | |
606 | struct super_block *s; | |
607 | struct dentry *root; | |
8a4b83cc | 608 | struct btrfs_fs_devices *fs_devices = NULL; |
97288f2c | 609 | fmode_t mode = FMODE_READ; |
73f73415 JB |
610 | char *subvol_name = NULL; |
611 | u64 subvol_objectid = 0; | |
4b82d6e4 | 612 | int error = 0; |
73f73415 | 613 | int found = 0; |
4b82d6e4 | 614 | |
97288f2c CH |
615 | if (!(flags & MS_RDONLY)) |
616 | mode |= FMODE_WRITE; | |
617 | ||
618 | error = btrfs_parse_early_options(data, mode, fs_type, | |
73f73415 JB |
619 | &subvol_name, &subvol_objectid, |
620 | &fs_devices); | |
edf24abe | 621 | if (error) |
1f483660 | 622 | return error; |
edf24abe | 623 | |
97288f2c | 624 | error = btrfs_scan_one_device(dev_name, mode, fs_type, &fs_devices); |
8a4b83cc | 625 | if (error) |
edf24abe | 626 | goto error_free_subvol_name; |
4b82d6e4 | 627 | |
97288f2c | 628 | error = btrfs_open_devices(fs_devices, mode, fs_type); |
8a4b83cc | 629 | if (error) |
edf24abe | 630 | goto error_free_subvol_name; |
8a4b83cc | 631 | |
2b82032c YZ |
632 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { |
633 | error = -EACCES; | |
634 | goto error_close_devices; | |
635 | } | |
636 | ||
dfe25020 | 637 | bdev = fs_devices->latest_bdev; |
a061fc8d | 638 | s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices); |
4b82d6e4 Y |
639 | if (IS_ERR(s)) |
640 | goto error_s; | |
641 | ||
642 | if (s->s_root) { | |
643 | if ((flags ^ s->s_flags) & MS_RDONLY) { | |
6f5bbff9 | 644 | deactivate_locked_super(s); |
4b82d6e4 | 645 | error = -EBUSY; |
c146afad | 646 | goto error_close_devices; |
4b82d6e4 Y |
647 | } |
648 | ||
73f73415 | 649 | found = 1; |
2b82032c | 650 | btrfs_close_devices(fs_devices); |
4b82d6e4 Y |
651 | } else { |
652 | char b[BDEVNAME_SIZE]; | |
653 | ||
654 | s->s_flags = flags; | |
655 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); | |
8a4b83cc CM |
656 | error = btrfs_fill_super(s, fs_devices, data, |
657 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 | 658 | if (error) { |
6f5bbff9 | 659 | deactivate_locked_super(s); |
1f483660 | 660 | goto error_free_subvol_name; |
4b82d6e4 Y |
661 | } |
662 | ||
788f20eb | 663 | btrfs_sb(s)->fs_info->bdev_holder = fs_type; |
4b82d6e4 Y |
664 | s->s_flags |= MS_ACTIVE; |
665 | } | |
666 | ||
73f73415 JB |
667 | root = get_default_root(s, subvol_objectid); |
668 | if (IS_ERR(root)) { | |
669 | error = PTR_ERR(root); | |
670 | deactivate_locked_super(s); | |
671 | goto error; | |
672 | } | |
673 | /* if they gave us a subvolume name bind mount into that */ | |
674 | if (strcmp(subvol_name, ".")) { | |
675 | struct dentry *new_root; | |
676 | mutex_lock(&root->d_inode->i_mutex); | |
677 | new_root = lookup_one_len(subvol_name, root, | |
d397712b | 678 | strlen(subvol_name)); |
73f73415 | 679 | mutex_unlock(&root->d_inode->i_mutex); |
d397712b | 680 | |
73f73415 | 681 | if (IS_ERR(new_root)) { |
6f5bbff9 | 682 | deactivate_locked_super(s); |
73f73415 JB |
683 | error = PTR_ERR(new_root); |
684 | dput(root); | |
685 | goto error_close_devices; | |
76fcef19 | 686 | } |
73f73415 | 687 | if (!new_root->d_inode) { |
76fcef19 | 688 | dput(root); |
73f73415 | 689 | dput(new_root); |
6f5bbff9 | 690 | deactivate_locked_super(s); |
76fcef19 | 691 | error = -ENXIO; |
73f73415 | 692 | goto error_close_devices; |
76fcef19 | 693 | } |
73f73415 JB |
694 | dput(root); |
695 | root = new_root; | |
4b82d6e4 Y |
696 | } |
697 | ||
698 | mnt->mnt_sb = s; | |
699 | mnt->mnt_root = root; | |
edf24abe CH |
700 | |
701 | kfree(subvol_name); | |
4b82d6e4 Y |
702 | return 0; |
703 | ||
704 | error_s: | |
705 | error = PTR_ERR(s); | |
c146afad | 706 | error_close_devices: |
8a4b83cc | 707 | btrfs_close_devices(fs_devices); |
edf24abe CH |
708 | error_free_subvol_name: |
709 | kfree(subvol_name); | |
73f73415 | 710 | error: |
4b82d6e4 Y |
711 | return error; |
712 | } | |
2e635a27 | 713 | |
c146afad YZ |
714 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
715 | { | |
716 | struct btrfs_root *root = btrfs_sb(sb); | |
717 | int ret; | |
718 | ||
b288052e CM |
719 | ret = btrfs_parse_options(root, data); |
720 | if (ret) | |
721 | return -EINVAL; | |
722 | ||
c146afad YZ |
723 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
724 | return 0; | |
725 | ||
726 | if (*flags & MS_RDONLY) { | |
727 | sb->s_flags |= MS_RDONLY; | |
728 | ||
729 | ret = btrfs_commit_super(root); | |
730 | WARN_ON(ret); | |
731 | } else { | |
2b82032c YZ |
732 | if (root->fs_info->fs_devices->rw_devices == 0) |
733 | return -EACCES; | |
734 | ||
c146afad YZ |
735 | if (btrfs_super_log_root(&root->fs_info->super_copy) != 0) |
736 | return -EINVAL; | |
737 | ||
5d4f98a2 YZ |
738 | /* recover relocation */ |
739 | ret = btrfs_recover_relocation(root); | |
c146afad YZ |
740 | WARN_ON(ret); |
741 | ||
742 | ret = btrfs_cleanup_fs_roots(root->fs_info); | |
743 | WARN_ON(ret); | |
744 | ||
745 | sb->s_flags &= ~MS_RDONLY; | |
746 | } | |
747 | ||
748 | return 0; | |
749 | } | |
750 | ||
8fd17795 CM |
751 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
752 | { | |
753 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
4b52dff6 | 754 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
bd4d1088 JB |
755 | struct list_head *head = &root->fs_info->space_info; |
756 | struct btrfs_space_info *found; | |
757 | u64 total_used = 0; | |
758 | u64 data_used = 0; | |
db94535d | 759 | int bits = dentry->d_sb->s_blocksize_bits; |
9d03632e | 760 | __be32 *fsid = (__be32 *)root->fs_info->fsid; |
8fd17795 | 761 | |
bd4d1088 JB |
762 | rcu_read_lock(); |
763 | list_for_each_entry_rcu(found, head, list) { | |
764 | if (found->flags & (BTRFS_BLOCK_GROUP_DUP| | |
765 | BTRFS_BLOCK_GROUP_RAID10| | |
766 | BTRFS_BLOCK_GROUP_RAID1)) { | |
767 | total_used += found->bytes_used; | |
768 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) | |
769 | data_used += found->bytes_used; | |
770 | else | |
771 | data_used += found->total_bytes; | |
772 | } | |
773 | ||
774 | total_used += found->bytes_used; | |
775 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) | |
776 | data_used += found->bytes_used; | |
777 | else | |
778 | data_used += found->total_bytes; | |
779 | } | |
780 | rcu_read_unlock(); | |
781 | ||
8fd17795 | 782 | buf->f_namelen = BTRFS_NAME_LEN; |
db94535d | 783 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
bd4d1088 JB |
784 | buf->f_bfree = buf->f_blocks - (total_used >> bits); |
785 | buf->f_bavail = buf->f_blocks - (data_used >> bits); | |
8fd17795 CM |
786 | buf->f_bsize = dentry->d_sb->s_blocksize; |
787 | buf->f_type = BTRFS_SUPER_MAGIC; | |
d397712b | 788 | |
9d03632e | 789 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 790 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
791 | on a big-endian or little-endian host */ |
792 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
793 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 DW |
794 | /* Mask in the root object ID too, to disambiguate subvols */ |
795 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; | |
796 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; | |
797 | ||
8fd17795 CM |
798 | return 0; |
799 | } | |
b5133862 | 800 | |
2e635a27 CM |
801 | static struct file_system_type btrfs_fs_type = { |
802 | .owner = THIS_MODULE, | |
803 | .name = "btrfs", | |
804 | .get_sb = btrfs_get_sb, | |
a061fc8d | 805 | .kill_sb = kill_anon_super, |
2e635a27 CM |
806 | .fs_flags = FS_REQUIRES_DEV, |
807 | }; | |
a9218f6b | 808 | |
d352ac68 CM |
809 | /* |
810 | * used by btrfsctl to scan devices when no FS is mounted | |
811 | */ | |
8a4b83cc CM |
812 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
813 | unsigned long arg) | |
814 | { | |
815 | struct btrfs_ioctl_vol_args *vol; | |
816 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 817 | int ret = -ENOTTY; |
8a4b83cc | 818 | |
e441d54d CM |
819 | if (!capable(CAP_SYS_ADMIN)) |
820 | return -EPERM; | |
821 | ||
dae7b665 LZ |
822 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
823 | if (IS_ERR(vol)) | |
824 | return PTR_ERR(vol); | |
c071fcfd | 825 | |
8a4b83cc CM |
826 | switch (cmd) { |
827 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 828 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
829 | &btrfs_fs_type, &fs_devices); |
830 | break; | |
831 | } | |
dae7b665 | 832 | |
8a4b83cc | 833 | kfree(vol); |
f819d837 | 834 | return ret; |
8a4b83cc CM |
835 | } |
836 | ||
0176260f | 837 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b Y |
838 | { |
839 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
840 | mutex_lock(&root->fs_info->transaction_kthread_mutex); |
841 | mutex_lock(&root->fs_info->cleaner_mutex); | |
0176260f | 842 | return 0; |
ed0dab6b Y |
843 | } |
844 | ||
0176260f | 845 | static int btrfs_unfreeze(struct super_block *sb) |
ed0dab6b Y |
846 | { |
847 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
848 | mutex_unlock(&root->fs_info->cleaner_mutex); |
849 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
0176260f | 850 | return 0; |
ed0dab6b | 851 | } |
2e635a27 | 852 | |
b87221de | 853 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 854 | .drop_inode = btrfs_drop_inode, |
134e9731 | 855 | .delete_inode = btrfs_delete_inode, |
e20d96d6 | 856 | .put_super = btrfs_put_super, |
d5719762 | 857 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 858 | .show_options = btrfs_show_options, |
4730a4bc | 859 | .write_inode = btrfs_write_inode, |
b5133862 | 860 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
861 | .alloc_inode = btrfs_alloc_inode, |
862 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 863 | .statfs = btrfs_statfs, |
c146afad | 864 | .remount_fs = btrfs_remount, |
0176260f LT |
865 | .freeze_fs = btrfs_freeze, |
866 | .unfreeze_fs = btrfs_unfreeze, | |
e20d96d6 | 867 | }; |
a9218f6b CM |
868 | |
869 | static const struct file_operations btrfs_ctl_fops = { | |
870 | .unlocked_ioctl = btrfs_control_ioctl, | |
871 | .compat_ioctl = btrfs_control_ioctl, | |
872 | .owner = THIS_MODULE, | |
873 | }; | |
874 | ||
875 | static struct miscdevice btrfs_misc = { | |
876 | .minor = MISC_DYNAMIC_MINOR, | |
877 | .name = "btrfs-control", | |
878 | .fops = &btrfs_ctl_fops | |
879 | }; | |
880 | ||
881 | static int btrfs_interface_init(void) | |
882 | { | |
883 | return misc_register(&btrfs_misc); | |
884 | } | |
885 | ||
b2950863 | 886 | static void btrfs_interface_exit(void) |
a9218f6b CM |
887 | { |
888 | if (misc_deregister(&btrfs_misc) < 0) | |
d397712b | 889 | printk(KERN_INFO "misc_deregister failed for control device"); |
a9218f6b CM |
890 | } |
891 | ||
2e635a27 CM |
892 | static int __init init_btrfs_fs(void) |
893 | { | |
2c90e5d6 | 894 | int err; |
58176a96 JB |
895 | |
896 | err = btrfs_init_sysfs(); | |
897 | if (err) | |
898 | return err; | |
899 | ||
39279cc3 | 900 | err = btrfs_init_cachep(); |
2c90e5d6 | 901 | if (err) |
a74a4b97 | 902 | goto free_sysfs; |
d1310b2e CM |
903 | |
904 | err = extent_io_init(); | |
2f4cbe64 WB |
905 | if (err) |
906 | goto free_cachep; | |
907 | ||
d1310b2e CM |
908 | err = extent_map_init(); |
909 | if (err) | |
910 | goto free_extent_io; | |
911 | ||
a9218f6b | 912 | err = btrfs_interface_init(); |
2f4cbe64 WB |
913 | if (err) |
914 | goto free_extent_map; | |
c8b97818 | 915 | |
a9218f6b CM |
916 | err = register_filesystem(&btrfs_fs_type); |
917 | if (err) | |
918 | goto unregister_ioctl; | |
b3c3da71 CM |
919 | |
920 | printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); | |
2f4cbe64 WB |
921 | return 0; |
922 | ||
a9218f6b CM |
923 | unregister_ioctl: |
924 | btrfs_interface_exit(); | |
2f4cbe64 WB |
925 | free_extent_map: |
926 | extent_map_exit(); | |
d1310b2e CM |
927 | free_extent_io: |
928 | extent_io_exit(); | |
2f4cbe64 WB |
929 | free_cachep: |
930 | btrfs_destroy_cachep(); | |
a74a4b97 | 931 | free_sysfs: |
2f4cbe64 WB |
932 | btrfs_exit_sysfs(); |
933 | return err; | |
2e635a27 CM |
934 | } |
935 | ||
936 | static void __exit exit_btrfs_fs(void) | |
937 | { | |
39279cc3 | 938 | btrfs_destroy_cachep(); |
a52d9a80 | 939 | extent_map_exit(); |
d1310b2e | 940 | extent_io_exit(); |
a9218f6b | 941 | btrfs_interface_exit(); |
2e635a27 | 942 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 943 | btrfs_exit_sysfs(); |
8a4b83cc | 944 | btrfs_cleanup_fs_uuids(); |
c8b97818 | 945 | btrfs_zlib_exit(); |
2e635a27 CM |
946 | } |
947 | ||
948 | module_init(init_btrfs_fs) | |
949 | module_exit(exit_btrfs_fs) | |
950 | ||
951 | MODULE_LICENSE("GPL"); |