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