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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 | ||
edf24abe CH |
99 | /* |
100 | * Regular mount options parser. Everything that is needed only when | |
101 | * reading in a new superblock is parsed here. | |
102 | */ | |
103 | int btrfs_parse_options(struct btrfs_root *root, char *options) | |
95e05289 | 104 | { |
edf24abe | 105 | struct btrfs_fs_info *info = root->fs_info; |
95e05289 | 106 | substring_t args[MAX_OPT_ARGS]; |
da495ecc | 107 | char *p, *num, *orig; |
4543df7e | 108 | int intarg; |
a7a3f7ca | 109 | int ret = 0; |
b6cda9bc | 110 | |
95e05289 | 111 | if (!options) |
edf24abe | 112 | return 0; |
95e05289 | 113 | |
be20aa9d CM |
114 | /* |
115 | * strsep changes the string, duplicate it because parse_options | |
116 | * gets called twice | |
117 | */ | |
118 | options = kstrdup(options, GFP_NOFS); | |
119 | if (!options) | |
120 | return -ENOMEM; | |
121 | ||
da495ecc | 122 | orig = options; |
be20aa9d | 123 | |
edf24abe | 124 | while ((p = strsep(&options, ",")) != NULL) { |
95e05289 CM |
125 | int token; |
126 | if (!*p) | |
127 | continue; | |
128 | ||
129 | token = match_token(p, tokens, args); | |
130 | switch (token) { | |
dfe25020 | 131 | case Opt_degraded: |
edf24abe CH |
132 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
133 | btrfs_set_opt(info->mount_opt, DEGRADED); | |
dfe25020 | 134 | break; |
95e05289 | 135 | case Opt_subvol: |
73f73415 | 136 | case Opt_subvolid: |
43e570b0 | 137 | case Opt_device: |
edf24abe | 138 | /* |
43e570b0 | 139 | * These are parsed by btrfs_parse_early_options |
edf24abe CH |
140 | * and can be happily ignored here. |
141 | */ | |
b6cda9bc CM |
142 | break; |
143 | case Opt_nodatasum: | |
067c28ad | 144 | printk(KERN_INFO "btrfs: setting nodatasum\n"); |
edf24abe | 145 | btrfs_set_opt(info->mount_opt, NODATASUM); |
be20aa9d CM |
146 | break; |
147 | case Opt_nodatacow: | |
edf24abe CH |
148 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
149 | btrfs_set_opt(info->mount_opt, NODATACOW); | |
150 | btrfs_set_opt(info->mount_opt, NODATASUM); | |
95e05289 | 151 | break; |
c8b97818 CM |
152 | case Opt_compress: |
153 | printk(KERN_INFO "btrfs: use compression\n"); | |
154 | btrfs_set_opt(info->mount_opt, COMPRESS); | |
155 | break; | |
a555f810 CM |
156 | case Opt_compress_force: |
157 | printk(KERN_INFO "btrfs: forcing compression\n"); | |
158 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); | |
159 | btrfs_set_opt(info->mount_opt, COMPRESS); | |
160 | break; | |
e18e4809 | 161 | case Opt_ssd: |
edf24abe CH |
162 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
163 | btrfs_set_opt(info->mount_opt, SSD); | |
e18e4809 | 164 | break; |
451d7585 CM |
165 | case Opt_ssd_spread: |
166 | printk(KERN_INFO "btrfs: use spread ssd " | |
167 | "allocation scheme\n"); | |
168 | btrfs_set_opt(info->mount_opt, SSD); | |
169 | btrfs_set_opt(info->mount_opt, SSD_SPREAD); | |
170 | break; | |
3b30c22f | 171 | case Opt_nossd: |
451d7585 CM |
172 | printk(KERN_INFO "btrfs: not using ssd allocation " |
173 | "scheme\n"); | |
c289811c | 174 | btrfs_set_opt(info->mount_opt, NOSSD); |
3b30c22f | 175 | btrfs_clear_opt(info->mount_opt, SSD); |
451d7585 | 176 | btrfs_clear_opt(info->mount_opt, SSD_SPREAD); |
3b30c22f | 177 | break; |
21ad10cf | 178 | case Opt_nobarrier: |
edf24abe CH |
179 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
180 | btrfs_set_opt(info->mount_opt, NOBARRIER); | |
21ad10cf | 181 | break; |
4543df7e CM |
182 | case Opt_thread_pool: |
183 | intarg = 0; | |
184 | match_int(&args[0], &intarg); | |
185 | if (intarg) { | |
186 | info->thread_pool_size = intarg; | |
187 | printk(KERN_INFO "btrfs: thread pool %d\n", | |
188 | info->thread_pool_size); | |
189 | } | |
190 | break; | |
c59f8951 | 191 | case Opt_max_extent: |
edf24abe CH |
192 | num = match_strdup(&args[0]); |
193 | if (num) { | |
91748467 | 194 | info->max_extent = memparse(num, NULL); |
edf24abe CH |
195 | kfree(num); |
196 | ||
197 | info->max_extent = max_t(u64, | |
198 | info->max_extent, root->sectorsize); | |
199 | printk(KERN_INFO "btrfs: max_extent at %llu\n", | |
21380931 | 200 | (unsigned long long)info->max_extent); |
c59f8951 CM |
201 | } |
202 | break; | |
6f568d35 | 203 | case Opt_max_inline: |
edf24abe CH |
204 | num = match_strdup(&args[0]); |
205 | if (num) { | |
91748467 | 206 | info->max_inline = memparse(num, NULL); |
edf24abe CH |
207 | kfree(num); |
208 | ||
15ada040 CM |
209 | if (info->max_inline) { |
210 | info->max_inline = max_t(u64, | |
211 | info->max_inline, | |
212 | root->sectorsize); | |
213 | } | |
edf24abe | 214 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
21380931 | 215 | (unsigned long long)info->max_inline); |
6f568d35 CM |
216 | } |
217 | break; | |
8f662a76 | 218 | case Opt_alloc_start: |
edf24abe CH |
219 | num = match_strdup(&args[0]); |
220 | if (num) { | |
91748467 | 221 | info->alloc_start = memparse(num, NULL); |
edf24abe CH |
222 | kfree(num); |
223 | printk(KERN_INFO | |
224 | "btrfs: allocations start at %llu\n", | |
21380931 | 225 | (unsigned long long)info->alloc_start); |
8f662a76 CM |
226 | } |
227 | break; | |
33268eaf JB |
228 | case Opt_noacl: |
229 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; | |
230 | break; | |
3a5e1404 SW |
231 | case Opt_notreelog: |
232 | printk(KERN_INFO "btrfs: disabling tree log\n"); | |
233 | btrfs_set_opt(info->mount_opt, NOTREELOG); | |
234 | break; | |
dccae999 SW |
235 | case Opt_flushoncommit: |
236 | printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); | |
237 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); | |
238 | break; | |
97e728d4 JB |
239 | case Opt_ratio: |
240 | intarg = 0; | |
241 | match_int(&args[0], &intarg); | |
242 | if (intarg) { | |
243 | info->metadata_ratio = intarg; | |
244 | printk(KERN_INFO "btrfs: metadata ratio %d\n", | |
245 | info->metadata_ratio); | |
246 | } | |
247 | break; | |
e244a0ae CH |
248 | case Opt_discard: |
249 | btrfs_set_opt(info->mount_opt, DISCARD); | |
250 | break; | |
a7a3f7ca SW |
251 | case Opt_err: |
252 | printk(KERN_INFO "btrfs: unrecognized mount option " | |
253 | "'%s'\n", p); | |
254 | ret = -EINVAL; | |
255 | goto out; | |
95e05289 | 256 | default: |
be20aa9d | 257 | break; |
95e05289 CM |
258 | } |
259 | } | |
a7a3f7ca | 260 | out: |
da495ecc | 261 | kfree(orig); |
a7a3f7ca | 262 | return ret; |
edf24abe CH |
263 | } |
264 | ||
265 | /* | |
266 | * Parse mount options that are required early in the mount process. | |
267 | * | |
268 | * All other options will be parsed on much later in the mount process and | |
269 | * only when we need to allocate a new super block. | |
270 | */ | |
97288f2c | 271 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
73f73415 | 272 | void *holder, char **subvol_name, u64 *subvol_objectid, |
43e570b0 | 273 | struct btrfs_fs_devices **fs_devices) |
edf24abe CH |
274 | { |
275 | substring_t args[MAX_OPT_ARGS]; | |
276 | char *opts, *p; | |
277 | int error = 0; | |
73f73415 | 278 | int intarg; |
edf24abe CH |
279 | |
280 | if (!options) | |
281 | goto out; | |
282 | ||
283 | /* | |
284 | * strsep changes the string, duplicate it because parse_options | |
285 | * gets called twice | |
286 | */ | |
287 | opts = kstrdup(options, GFP_KERNEL); | |
288 | if (!opts) | |
289 | return -ENOMEM; | |
290 | ||
291 | while ((p = strsep(&opts, ",")) != NULL) { | |
292 | int token; | |
293 | if (!*p) | |
294 | continue; | |
295 | ||
296 | token = match_token(p, tokens, args); | |
297 | switch (token) { | |
298 | case Opt_subvol: | |
299 | *subvol_name = match_strdup(&args[0]); | |
300 | break; | |
73f73415 JB |
301 | case Opt_subvolid: |
302 | intarg = 0; | |
4849f01d JB |
303 | error = match_int(&args[0], &intarg); |
304 | if (!error) { | |
305 | /* we want the original fs_tree */ | |
306 | if (!intarg) | |
307 | *subvol_objectid = | |
308 | BTRFS_FS_TREE_OBJECTID; | |
309 | else | |
310 | *subvol_objectid = intarg; | |
311 | } | |
73f73415 | 312 | break; |
43e570b0 CH |
313 | case Opt_device: |
314 | error = btrfs_scan_one_device(match_strdup(&args[0]), | |
315 | flags, holder, fs_devices); | |
316 | if (error) | |
317 | goto out_free_opts; | |
318 | break; | |
edf24abe CH |
319 | default: |
320 | break; | |
321 | } | |
322 | } | |
323 | ||
43e570b0 | 324 | out_free_opts: |
edf24abe CH |
325 | kfree(opts); |
326 | out: | |
327 | /* | |
328 | * If no subvolume name is specified we use the default one. Allocate | |
3de4586c | 329 | * a copy of the string "." here so that code later in the |
edf24abe CH |
330 | * mount path doesn't care if it's the default volume or another one. |
331 | */ | |
332 | if (!*subvol_name) { | |
3de4586c | 333 | *subvol_name = kstrdup(".", GFP_KERNEL); |
edf24abe CH |
334 | if (!*subvol_name) |
335 | return -ENOMEM; | |
336 | } | |
337 | return error; | |
95e05289 CM |
338 | } |
339 | ||
73f73415 JB |
340 | static struct dentry *get_default_root(struct super_block *sb, |
341 | u64 subvol_objectid) | |
342 | { | |
343 | struct btrfs_root *root = sb->s_fs_info; | |
344 | struct btrfs_root *new_root; | |
345 | struct btrfs_dir_item *di; | |
346 | struct btrfs_path *path; | |
347 | struct btrfs_key location; | |
348 | struct inode *inode; | |
349 | struct dentry *dentry; | |
350 | u64 dir_id; | |
351 | int new = 0; | |
352 | ||
353 | /* | |
354 | * We have a specific subvol we want to mount, just setup location and | |
355 | * go look up the root. | |
356 | */ | |
357 | if (subvol_objectid) { | |
358 | location.objectid = subvol_objectid; | |
359 | location.type = BTRFS_ROOT_ITEM_KEY; | |
360 | location.offset = (u64)-1; | |
361 | goto find_root; | |
362 | } | |
363 | ||
364 | path = btrfs_alloc_path(); | |
365 | if (!path) | |
366 | return ERR_PTR(-ENOMEM); | |
367 | path->leave_spinning = 1; | |
368 | ||
369 | /* | |
370 | * Find the "default" dir item which points to the root item that we | |
371 | * will mount by default if we haven't been given a specific subvolume | |
372 | * to mount. | |
373 | */ | |
374 | dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); | |
375 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); | |
376 | if (!di) { | |
377 | /* | |
378 | * Ok the default dir item isn't there. This is weird since | |
379 | * it's always been there, but don't freak out, just try and | |
380 | * mount to root most subvolume. | |
381 | */ | |
382 | btrfs_free_path(path); | |
383 | dir_id = BTRFS_FIRST_FREE_OBJECTID; | |
384 | new_root = root->fs_info->fs_root; | |
385 | goto setup_root; | |
386 | } | |
387 | ||
388 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
389 | btrfs_free_path(path); | |
390 | ||
391 | find_root: | |
392 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); | |
393 | if (IS_ERR(new_root)) | |
394 | return ERR_PTR(PTR_ERR(new_root)); | |
395 | ||
396 | if (btrfs_root_refs(&new_root->root_item) == 0) | |
397 | return ERR_PTR(-ENOENT); | |
398 | ||
399 | dir_id = btrfs_root_dirid(&new_root->root_item); | |
400 | setup_root: | |
401 | location.objectid = dir_id; | |
402 | location.type = BTRFS_INODE_ITEM_KEY; | |
403 | location.offset = 0; | |
404 | ||
405 | inode = btrfs_iget(sb, &location, new_root, &new); | |
406 | if (!inode) | |
407 | return ERR_PTR(-ENOMEM); | |
408 | ||
409 | /* | |
410 | * If we're just mounting the root most subvol put the inode and return | |
411 | * a reference to the dentry. We will have already gotten a reference | |
412 | * to the inode in btrfs_fill_super so we're good to go. | |
413 | */ | |
414 | if (!new && sb->s_root->d_inode == inode) { | |
415 | iput(inode); | |
416 | return dget(sb->s_root); | |
417 | } | |
418 | ||
419 | if (new) { | |
420 | const struct qstr name = { .name = "/", .len = 1 }; | |
421 | ||
422 | /* | |
423 | * New inode, we need to make the dentry a sibling of s_root so | |
424 | * everything gets cleaned up properly on unmount. | |
425 | */ | |
426 | dentry = d_alloc(sb->s_root, &name); | |
427 | if (!dentry) { | |
428 | iput(inode); | |
429 | return ERR_PTR(-ENOMEM); | |
430 | } | |
431 | d_splice_alias(inode, dentry); | |
432 | } else { | |
433 | /* | |
434 | * We found the inode in cache, just find a dentry for it and | |
435 | * put the reference to the inode we just got. | |
436 | */ | |
437 | dentry = d_find_alias(inode); | |
438 | iput(inode); | |
439 | } | |
440 | ||
441 | return dentry; | |
442 | } | |
443 | ||
d397712b | 444 | static int btrfs_fill_super(struct super_block *sb, |
8a4b83cc | 445 | struct btrfs_fs_devices *fs_devices, |
d397712b | 446 | void *data, int silent) |
75dfe396 | 447 | { |
d397712b CM |
448 | struct inode *inode; |
449 | struct dentry *root_dentry; | |
39279cc3 CM |
450 | struct btrfs_super_block *disk_super; |
451 | struct btrfs_root *tree_root; | |
5d4f98a2 | 452 | struct btrfs_key key; |
39279cc3 | 453 | int err; |
a429e513 | 454 | |
39279cc3 CM |
455 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
456 | sb->s_magic = BTRFS_SUPER_MAGIC; | |
457 | sb->s_op = &btrfs_super_ops; | |
be6e8dc0 | 458 | sb->s_export_op = &btrfs_export_ops; |
5103e947 | 459 | sb->s_xattr = btrfs_xattr_handlers; |
39279cc3 | 460 | sb->s_time_gran = 1; |
0eda294d | 461 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
33268eaf | 462 | sb->s_flags |= MS_POSIXACL; |
49cf6f45 | 463 | #endif |
a429e513 | 464 | |
dfe25020 | 465 | tree_root = open_ctree(sb, fs_devices, (char *)data); |
6567e837 | 466 | |
e58ca020 | 467 | if (IS_ERR(tree_root)) { |
39279cc3 | 468 | printk("btrfs: open_ctree failed\n"); |
e58ca020 | 469 | return PTR_ERR(tree_root); |
a429e513 | 470 | } |
39279cc3 | 471 | sb->s_fs_info = tree_root; |
5f39d397 | 472 | disk_super = &tree_root->fs_info->super_copy; |
a429e513 | 473 | |
5d4f98a2 YZ |
474 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
475 | key.type = BTRFS_INODE_ITEM_KEY; | |
476 | key.offset = 0; | |
73f73415 | 477 | inode = btrfs_iget(sb, &key, tree_root->fs_info->fs_root, NULL); |
5d4f98a2 YZ |
478 | if (IS_ERR(inode)) { |
479 | err = PTR_ERR(inode); | |
39279cc3 | 480 | goto fail_close; |
f254e52c | 481 | } |
f254e52c | 482 | |
39279cc3 CM |
483 | root_dentry = d_alloc_root(inode); |
484 | if (!root_dentry) { | |
485 | iput(inode); | |
486 | err = -ENOMEM; | |
487 | goto fail_close; | |
f254e52c | 488 | } |
58176a96 | 489 | |
39279cc3 | 490 | sb->s_root = root_dentry; |
6885f308 | 491 | |
6885f308 | 492 | save_mount_options(sb, data); |
2619ba1f | 493 | return 0; |
39279cc3 CM |
494 | |
495 | fail_close: | |
496 | close_ctree(tree_root); | |
497 | return err; | |
2619ba1f CM |
498 | } |
499 | ||
6bf13c0c | 500 | int btrfs_sync_fs(struct super_block *sb, int wait) |
c5739bba CM |
501 | { |
502 | struct btrfs_trans_handle *trans; | |
dccae999 | 503 | struct btrfs_root *root = btrfs_sb(sb); |
c5739bba | 504 | int ret; |
2619ba1f | 505 | |
39279cc3 CM |
506 | if (!wait) { |
507 | filemap_flush(root->fs_info->btree_inode->i_mapping); | |
508 | return 0; | |
509 | } | |
771ed689 | 510 | |
24bbcf04 YZ |
511 | btrfs_start_delalloc_inodes(root, 0); |
512 | btrfs_wait_ordered_extents(root, 0, 0); | |
771ed689 | 513 | |
c5739bba | 514 | trans = btrfs_start_transaction(root, 1); |
c5739bba | 515 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d | 516 | return ret; |
2c90e5d6 CM |
517 | } |
518 | ||
a9572a15 EP |
519 | static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
520 | { | |
521 | struct btrfs_root *root = btrfs_sb(vfs->mnt_sb); | |
522 | struct btrfs_fs_info *info = root->fs_info; | |
523 | ||
524 | if (btrfs_test_opt(root, DEGRADED)) | |
525 | seq_puts(seq, ",degraded"); | |
526 | if (btrfs_test_opt(root, NODATASUM)) | |
527 | seq_puts(seq, ",nodatasum"); | |
528 | if (btrfs_test_opt(root, NODATACOW)) | |
529 | seq_puts(seq, ",nodatacow"); | |
530 | if (btrfs_test_opt(root, NOBARRIER)) | |
531 | seq_puts(seq, ",nobarrier"); | |
532 | if (info->max_extent != (u64)-1) | |
21380931 JB |
533 | seq_printf(seq, ",max_extent=%llu", |
534 | (unsigned long long)info->max_extent); | |
a9572a15 | 535 | if (info->max_inline != 8192 * 1024) |
21380931 JB |
536 | seq_printf(seq, ",max_inline=%llu", |
537 | (unsigned long long)info->max_inline); | |
a9572a15 | 538 | if (info->alloc_start != 0) |
21380931 JB |
539 | seq_printf(seq, ",alloc_start=%llu", |
540 | (unsigned long long)info->alloc_start); | |
a9572a15 EP |
541 | if (info->thread_pool_size != min_t(unsigned long, |
542 | num_online_cpus() + 2, 8)) | |
543 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); | |
544 | if (btrfs_test_opt(root, COMPRESS)) | |
545 | seq_puts(seq, ",compress"); | |
c289811c CM |
546 | if (btrfs_test_opt(root, NOSSD)) |
547 | seq_puts(seq, ",nossd"); | |
451d7585 CM |
548 | if (btrfs_test_opt(root, SSD_SPREAD)) |
549 | seq_puts(seq, ",ssd_spread"); | |
550 | else if (btrfs_test_opt(root, SSD)) | |
a9572a15 | 551 | seq_puts(seq, ",ssd"); |
3a5e1404 | 552 | if (btrfs_test_opt(root, NOTREELOG)) |
6b65c5c6 | 553 | seq_puts(seq, ",notreelog"); |
dccae999 | 554 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
6b65c5c6 | 555 | seq_puts(seq, ",flushoncommit"); |
20a5239a MW |
556 | if (btrfs_test_opt(root, DISCARD)) |
557 | seq_puts(seq, ",discard"); | |
a9572a15 EP |
558 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
559 | seq_puts(seq, ",noacl"); | |
560 | return 0; | |
561 | } | |
562 | ||
a061fc8d | 563 | static int btrfs_test_super(struct super_block *s, void *data) |
4b82d6e4 | 564 | { |
a061fc8d CM |
565 | struct btrfs_fs_devices *test_fs_devices = data; |
566 | struct btrfs_root *root = btrfs_sb(s); | |
4b82d6e4 | 567 | |
a061fc8d | 568 | return root->fs_info->fs_devices == test_fs_devices; |
4b82d6e4 Y |
569 | } |
570 | ||
edf24abe CH |
571 | /* |
572 | * Find a superblock for the given device / mount point. | |
573 | * | |
574 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions | |
575 | * for multiple device setup. Make sure to keep it in sync. | |
576 | */ | |
577 | static int btrfs_get_sb(struct file_system_type *fs_type, int flags, | |
578 | const char *dev_name, void *data, struct vfsmount *mnt) | |
4b82d6e4 Y |
579 | { |
580 | struct block_device *bdev = NULL; | |
581 | struct super_block *s; | |
582 | struct dentry *root; | |
8a4b83cc | 583 | struct btrfs_fs_devices *fs_devices = NULL; |
97288f2c | 584 | fmode_t mode = FMODE_READ; |
73f73415 JB |
585 | char *subvol_name = NULL; |
586 | u64 subvol_objectid = 0; | |
4b82d6e4 | 587 | int error = 0; |
73f73415 | 588 | int found = 0; |
4b82d6e4 | 589 | |
97288f2c CH |
590 | if (!(flags & MS_RDONLY)) |
591 | mode |= FMODE_WRITE; | |
592 | ||
593 | error = btrfs_parse_early_options(data, mode, fs_type, | |
73f73415 JB |
594 | &subvol_name, &subvol_objectid, |
595 | &fs_devices); | |
edf24abe | 596 | if (error) |
1f483660 | 597 | return error; |
edf24abe | 598 | |
97288f2c | 599 | error = btrfs_scan_one_device(dev_name, mode, fs_type, &fs_devices); |
8a4b83cc | 600 | if (error) |
edf24abe | 601 | goto error_free_subvol_name; |
4b82d6e4 | 602 | |
97288f2c | 603 | error = btrfs_open_devices(fs_devices, mode, fs_type); |
8a4b83cc | 604 | if (error) |
edf24abe | 605 | goto error_free_subvol_name; |
8a4b83cc | 606 | |
2b82032c YZ |
607 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { |
608 | error = -EACCES; | |
609 | goto error_close_devices; | |
610 | } | |
611 | ||
dfe25020 | 612 | bdev = fs_devices->latest_bdev; |
a061fc8d | 613 | s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices); |
4b82d6e4 Y |
614 | if (IS_ERR(s)) |
615 | goto error_s; | |
616 | ||
617 | if (s->s_root) { | |
618 | if ((flags ^ s->s_flags) & MS_RDONLY) { | |
6f5bbff9 | 619 | deactivate_locked_super(s); |
4b82d6e4 | 620 | error = -EBUSY; |
c146afad | 621 | goto error_close_devices; |
4b82d6e4 Y |
622 | } |
623 | ||
73f73415 | 624 | found = 1; |
2b82032c | 625 | btrfs_close_devices(fs_devices); |
4b82d6e4 Y |
626 | } else { |
627 | char b[BDEVNAME_SIZE]; | |
628 | ||
629 | s->s_flags = flags; | |
630 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); | |
8a4b83cc CM |
631 | error = btrfs_fill_super(s, fs_devices, data, |
632 | flags & MS_SILENT ? 1 : 0); | |
4b82d6e4 | 633 | if (error) { |
6f5bbff9 | 634 | deactivate_locked_super(s); |
1f483660 | 635 | goto error_free_subvol_name; |
4b82d6e4 Y |
636 | } |
637 | ||
788f20eb | 638 | btrfs_sb(s)->fs_info->bdev_holder = fs_type; |
4b82d6e4 Y |
639 | s->s_flags |= MS_ACTIVE; |
640 | } | |
641 | ||
73f73415 JB |
642 | root = get_default_root(s, subvol_objectid); |
643 | if (IS_ERR(root)) { | |
644 | error = PTR_ERR(root); | |
645 | deactivate_locked_super(s); | |
646 | goto error; | |
647 | } | |
648 | /* if they gave us a subvolume name bind mount into that */ | |
649 | if (strcmp(subvol_name, ".")) { | |
650 | struct dentry *new_root; | |
651 | mutex_lock(&root->d_inode->i_mutex); | |
652 | new_root = lookup_one_len(subvol_name, root, | |
d397712b | 653 | strlen(subvol_name)); |
73f73415 | 654 | mutex_unlock(&root->d_inode->i_mutex); |
d397712b | 655 | |
73f73415 | 656 | if (IS_ERR(new_root)) { |
6f5bbff9 | 657 | deactivate_locked_super(s); |
73f73415 JB |
658 | error = PTR_ERR(new_root); |
659 | dput(root); | |
660 | goto error_close_devices; | |
76fcef19 | 661 | } |
73f73415 | 662 | if (!new_root->d_inode) { |
76fcef19 | 663 | dput(root); |
73f73415 | 664 | dput(new_root); |
6f5bbff9 | 665 | deactivate_locked_super(s); |
76fcef19 | 666 | error = -ENXIO; |
73f73415 | 667 | goto error_close_devices; |
76fcef19 | 668 | } |
73f73415 JB |
669 | dput(root); |
670 | root = new_root; | |
4b82d6e4 Y |
671 | } |
672 | ||
673 | mnt->mnt_sb = s; | |
674 | mnt->mnt_root = root; | |
edf24abe CH |
675 | |
676 | kfree(subvol_name); | |
4b82d6e4 Y |
677 | return 0; |
678 | ||
679 | error_s: | |
680 | error = PTR_ERR(s); | |
c146afad | 681 | error_close_devices: |
8a4b83cc | 682 | btrfs_close_devices(fs_devices); |
edf24abe CH |
683 | error_free_subvol_name: |
684 | kfree(subvol_name); | |
73f73415 | 685 | error: |
4b82d6e4 Y |
686 | return error; |
687 | } | |
2e635a27 | 688 | |
c146afad YZ |
689 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
690 | { | |
691 | struct btrfs_root *root = btrfs_sb(sb); | |
692 | int ret; | |
693 | ||
b288052e CM |
694 | ret = btrfs_parse_options(root, data); |
695 | if (ret) | |
696 | return -EINVAL; | |
697 | ||
c146afad YZ |
698 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
699 | return 0; | |
700 | ||
701 | if (*flags & MS_RDONLY) { | |
702 | sb->s_flags |= MS_RDONLY; | |
703 | ||
704 | ret = btrfs_commit_super(root); | |
705 | WARN_ON(ret); | |
706 | } else { | |
2b82032c YZ |
707 | if (root->fs_info->fs_devices->rw_devices == 0) |
708 | return -EACCES; | |
709 | ||
c146afad YZ |
710 | if (btrfs_super_log_root(&root->fs_info->super_copy) != 0) |
711 | return -EINVAL; | |
712 | ||
5d4f98a2 YZ |
713 | /* recover relocation */ |
714 | ret = btrfs_recover_relocation(root); | |
c146afad YZ |
715 | WARN_ON(ret); |
716 | ||
717 | ret = btrfs_cleanup_fs_roots(root->fs_info); | |
718 | WARN_ON(ret); | |
719 | ||
720 | sb->s_flags &= ~MS_RDONLY; | |
721 | } | |
722 | ||
723 | return 0; | |
724 | } | |
725 | ||
8fd17795 CM |
726 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
727 | { | |
728 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); | |
4b52dff6 | 729 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
bd4d1088 JB |
730 | struct list_head *head = &root->fs_info->space_info; |
731 | struct btrfs_space_info *found; | |
732 | u64 total_used = 0; | |
733 | u64 data_used = 0; | |
db94535d | 734 | int bits = dentry->d_sb->s_blocksize_bits; |
9d03632e | 735 | __be32 *fsid = (__be32 *)root->fs_info->fsid; |
8fd17795 | 736 | |
bd4d1088 JB |
737 | rcu_read_lock(); |
738 | list_for_each_entry_rcu(found, head, list) { | |
739 | if (found->flags & (BTRFS_BLOCK_GROUP_DUP| | |
740 | BTRFS_BLOCK_GROUP_RAID10| | |
741 | BTRFS_BLOCK_GROUP_RAID1)) { | |
742 | total_used += found->bytes_used; | |
743 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) | |
744 | data_used += found->bytes_used; | |
745 | else | |
746 | data_used += found->total_bytes; | |
747 | } | |
748 | ||
749 | total_used += found->bytes_used; | |
750 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) | |
751 | data_used += found->bytes_used; | |
752 | else | |
753 | data_used += found->total_bytes; | |
754 | } | |
755 | rcu_read_unlock(); | |
756 | ||
8fd17795 | 757 | buf->f_namelen = BTRFS_NAME_LEN; |
db94535d | 758 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
bd4d1088 JB |
759 | buf->f_bfree = buf->f_blocks - (total_used >> bits); |
760 | buf->f_bavail = buf->f_blocks - (data_used >> bits); | |
8fd17795 CM |
761 | buf->f_bsize = dentry->d_sb->s_blocksize; |
762 | buf->f_type = BTRFS_SUPER_MAGIC; | |
d397712b | 763 | |
9d03632e | 764 | /* We treat it as constant endianness (it doesn't matter _which_) |
d397712b | 765 | because we want the fsid to come out the same whether mounted |
9d03632e DW |
766 | on a big-endian or little-endian host */ |
767 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); | |
768 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); | |
32d48fa1 DW |
769 | /* Mask in the root object ID too, to disambiguate subvols */ |
770 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; | |
771 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; | |
772 | ||
8fd17795 CM |
773 | return 0; |
774 | } | |
b5133862 | 775 | |
2e635a27 CM |
776 | static struct file_system_type btrfs_fs_type = { |
777 | .owner = THIS_MODULE, | |
778 | .name = "btrfs", | |
779 | .get_sb = btrfs_get_sb, | |
a061fc8d | 780 | .kill_sb = kill_anon_super, |
2e635a27 CM |
781 | .fs_flags = FS_REQUIRES_DEV, |
782 | }; | |
a9218f6b | 783 | |
d352ac68 CM |
784 | /* |
785 | * used by btrfsctl to scan devices when no FS is mounted | |
786 | */ | |
8a4b83cc CM |
787 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
788 | unsigned long arg) | |
789 | { | |
790 | struct btrfs_ioctl_vol_args *vol; | |
791 | struct btrfs_fs_devices *fs_devices; | |
c071fcfd | 792 | int ret = -ENOTTY; |
8a4b83cc | 793 | |
e441d54d CM |
794 | if (!capable(CAP_SYS_ADMIN)) |
795 | return -EPERM; | |
796 | ||
dae7b665 LZ |
797 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
798 | if (IS_ERR(vol)) | |
799 | return PTR_ERR(vol); | |
c071fcfd | 800 | |
8a4b83cc CM |
801 | switch (cmd) { |
802 | case BTRFS_IOC_SCAN_DEV: | |
97288f2c | 803 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
8a4b83cc CM |
804 | &btrfs_fs_type, &fs_devices); |
805 | break; | |
806 | } | |
dae7b665 | 807 | |
8a4b83cc | 808 | kfree(vol); |
f819d837 | 809 | return ret; |
8a4b83cc CM |
810 | } |
811 | ||
0176260f | 812 | static int btrfs_freeze(struct super_block *sb) |
ed0dab6b Y |
813 | { |
814 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
815 | mutex_lock(&root->fs_info->transaction_kthread_mutex); |
816 | mutex_lock(&root->fs_info->cleaner_mutex); | |
0176260f | 817 | return 0; |
ed0dab6b Y |
818 | } |
819 | ||
0176260f | 820 | static int btrfs_unfreeze(struct super_block *sb) |
ed0dab6b Y |
821 | { |
822 | struct btrfs_root *root = btrfs_sb(sb); | |
a74a4b97 CM |
823 | mutex_unlock(&root->fs_info->cleaner_mutex); |
824 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
0176260f | 825 | return 0; |
ed0dab6b | 826 | } |
2e635a27 | 827 | |
b87221de | 828 | static const struct super_operations btrfs_super_ops = { |
76dda93c | 829 | .drop_inode = btrfs_drop_inode, |
134e9731 | 830 | .delete_inode = btrfs_delete_inode, |
e20d96d6 | 831 | .put_super = btrfs_put_super, |
d5719762 | 832 | .sync_fs = btrfs_sync_fs, |
a9572a15 | 833 | .show_options = btrfs_show_options, |
4730a4bc | 834 | .write_inode = btrfs_write_inode, |
b5133862 | 835 | .dirty_inode = btrfs_dirty_inode, |
2c90e5d6 CM |
836 | .alloc_inode = btrfs_alloc_inode, |
837 | .destroy_inode = btrfs_destroy_inode, | |
8fd17795 | 838 | .statfs = btrfs_statfs, |
c146afad | 839 | .remount_fs = btrfs_remount, |
0176260f LT |
840 | .freeze_fs = btrfs_freeze, |
841 | .unfreeze_fs = btrfs_unfreeze, | |
e20d96d6 | 842 | }; |
a9218f6b CM |
843 | |
844 | static const struct file_operations btrfs_ctl_fops = { | |
845 | .unlocked_ioctl = btrfs_control_ioctl, | |
846 | .compat_ioctl = btrfs_control_ioctl, | |
847 | .owner = THIS_MODULE, | |
848 | }; | |
849 | ||
850 | static struct miscdevice btrfs_misc = { | |
851 | .minor = MISC_DYNAMIC_MINOR, | |
852 | .name = "btrfs-control", | |
853 | .fops = &btrfs_ctl_fops | |
854 | }; | |
855 | ||
856 | static int btrfs_interface_init(void) | |
857 | { | |
858 | return misc_register(&btrfs_misc); | |
859 | } | |
860 | ||
b2950863 | 861 | static void btrfs_interface_exit(void) |
a9218f6b CM |
862 | { |
863 | if (misc_deregister(&btrfs_misc) < 0) | |
d397712b | 864 | printk(KERN_INFO "misc_deregister failed for control device"); |
a9218f6b CM |
865 | } |
866 | ||
2e635a27 CM |
867 | static int __init init_btrfs_fs(void) |
868 | { | |
2c90e5d6 | 869 | int err; |
58176a96 JB |
870 | |
871 | err = btrfs_init_sysfs(); | |
872 | if (err) | |
873 | return err; | |
874 | ||
39279cc3 | 875 | err = btrfs_init_cachep(); |
2c90e5d6 | 876 | if (err) |
a74a4b97 | 877 | goto free_sysfs; |
d1310b2e CM |
878 | |
879 | err = extent_io_init(); | |
2f4cbe64 WB |
880 | if (err) |
881 | goto free_cachep; | |
882 | ||
d1310b2e CM |
883 | err = extent_map_init(); |
884 | if (err) | |
885 | goto free_extent_io; | |
886 | ||
a9218f6b | 887 | err = btrfs_interface_init(); |
2f4cbe64 WB |
888 | if (err) |
889 | goto free_extent_map; | |
c8b97818 | 890 | |
a9218f6b CM |
891 | err = register_filesystem(&btrfs_fs_type); |
892 | if (err) | |
893 | goto unregister_ioctl; | |
b3c3da71 CM |
894 | |
895 | printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); | |
2f4cbe64 WB |
896 | return 0; |
897 | ||
a9218f6b CM |
898 | unregister_ioctl: |
899 | btrfs_interface_exit(); | |
2f4cbe64 WB |
900 | free_extent_map: |
901 | extent_map_exit(); | |
d1310b2e CM |
902 | free_extent_io: |
903 | extent_io_exit(); | |
2f4cbe64 WB |
904 | free_cachep: |
905 | btrfs_destroy_cachep(); | |
a74a4b97 | 906 | free_sysfs: |
2f4cbe64 WB |
907 | btrfs_exit_sysfs(); |
908 | return err; | |
2e635a27 CM |
909 | } |
910 | ||
911 | static void __exit exit_btrfs_fs(void) | |
912 | { | |
39279cc3 | 913 | btrfs_destroy_cachep(); |
a52d9a80 | 914 | extent_map_exit(); |
d1310b2e | 915 | extent_io_exit(); |
a9218f6b | 916 | btrfs_interface_exit(); |
2e635a27 | 917 | unregister_filesystem(&btrfs_fs_type); |
58176a96 | 918 | btrfs_exit_sysfs(); |
8a4b83cc | 919 | btrfs_cleanup_fs_uuids(); |
c8b97818 | 920 | btrfs_zlib_exit(); |
2e635a27 CM |
921 | } |
922 | ||
923 | module_init(init_btrfs_fs) | |
924 | module_exit(exit_btrfs_fs) | |
925 | ||
926 | MODULE_LICENSE("GPL"); |