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btrfs: allow balancing to dup with multi-device
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CommitLineData
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>
90a887c9 42#include <linux/cleancache.h>
22c44fe6 43#include <linux/ratelimit.h>
55e301fd 44#include <linux/btrfs.h>
16cdcec7 45#include "delayed-inode.h"
2e635a27 46#include "ctree.h"
e20d96d6 47#include "disk-io.h"
d5719762 48#include "transaction.h"
2c90e5d6 49#include "btrfs_inode.h"
3a686375 50#include "print-tree.h"
14a958e6 51#include "hash.h"
63541927 52#include "props.h"
5103e947 53#include "xattr.h"
8a4b83cc 54#include "volumes.h"
be6e8dc0 55#include "export.h"
c8b97818 56#include "compression.h"
9c5085c1 57#include "rcu-string.h"
8dabb742 58#include "dev-replace.h"
74255aa0 59#include "free-space-cache.h"
b9e9a6cb 60#include "backref.h"
dc11dd5d 61#include "tests/btrfs-tests.h"
2e635a27 62
d3982100 63#include "qgroup.h"
1abe9b8a 64#define CREATE_TRACE_POINTS
65#include <trace/events/btrfs.h>
66
b87221de 67static const struct super_operations btrfs_super_ops;
830c4adb 68static struct file_system_type btrfs_fs_type;
75dfe396 69
0723a047
HH
70static int btrfs_remount(struct super_block *sb, int *flags, char *data);
71
e33e17ee 72const char *btrfs_decode_error(int errno)
acce952b 73{
08748810 74 char *errstr = "unknown";
acce952b 75
76 switch (errno) {
77 case -EIO:
78 errstr = "IO failure";
79 break;
80 case -ENOMEM:
81 errstr = "Out of memory";
82 break;
83 case -EROFS:
84 errstr = "Readonly filesystem";
85 break;
8c342930
JM
86 case -EEXIST:
87 errstr = "Object already exists";
88 break;
94ef7280
DS
89 case -ENOSPC:
90 errstr = "No space left";
91 break;
92 case -ENOENT:
93 errstr = "No such entry";
94 break;
acce952b 95 }
96
97 return errstr;
98}
99
bbece8a3 100static void save_error_info(struct btrfs_fs_info *fs_info)
acce952b 101{
102 /*
103 * today we only save the error info into ram. Long term we'll
104 * also send it down to the disk
105 */
87533c47 106 set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
acce952b 107}
108
acce952b 109/* btrfs handle error by forcing the filesystem readonly */
110static void btrfs_handle_error(struct btrfs_fs_info *fs_info)
111{
112 struct super_block *sb = fs_info->sb;
113
114 if (sb->s_flags & MS_RDONLY)
115 return;
116
87533c47 117 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
acce952b 118 sb->s_flags |= MS_RDONLY;
c2cf52eb 119 btrfs_info(fs_info, "forced readonly");
1acd6831
SB
120 /*
121 * Note that a running device replace operation is not
122 * canceled here although there is no way to update
123 * the progress. It would add the risk of a deadlock,
124 * therefore the canceling is ommited. The only penalty
125 * is that some I/O remains active until the procedure
126 * completes. The next time when the filesystem is
127 * mounted writeable again, the device replace
128 * operation continues.
129 */
acce952b 130 }
131}
132
133/*
134 * __btrfs_std_error decodes expected errors from the caller and
135 * invokes the approciate error response.
136 */
c0d19e2b 137__cold
acce952b 138void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
4da35113 139 unsigned int line, int errno, const char *fmt, ...)
acce952b 140{
141 struct super_block *sb = fs_info->sb;
57d816a1 142#ifdef CONFIG_PRINTK
acce952b 143 const char *errstr;
57d816a1 144#endif
acce952b 145
146 /*
147 * Special case: if the error is EROFS, and we're already
148 * under MS_RDONLY, then it is safe here.
149 */
150 if (errno == -EROFS && (sb->s_flags & MS_RDONLY))
4da35113
JM
151 return;
152
57d816a1 153#ifdef CONFIG_PRINTK
08748810 154 errstr = btrfs_decode_error(errno);
4da35113 155 if (fmt) {
37252a66
ES
156 struct va_format vaf;
157 va_list args;
158
159 va_start(args, fmt);
160 vaf.fmt = fmt;
161 vaf.va = &args;
4da35113 162
efe120a0
FH
163 printk(KERN_CRIT
164 "BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n",
08748810 165 sb->s_id, function, line, errno, errstr, &vaf);
37252a66 166 va_end(args);
4da35113 167 } else {
efe120a0 168 printk(KERN_CRIT "BTRFS: error (device %s) in %s:%d: errno=%d %s\n",
08748810 169 sb->s_id, function, line, errno, errstr);
4da35113 170 }
57d816a1 171#endif
acce952b 172
4da35113 173 /* Don't go through full error handling during mount */
cf79ffb5
JB
174 save_error_info(fs_info);
175 if (sb->s_flags & MS_BORN)
4da35113 176 btrfs_handle_error(fs_info);
4da35113 177}
acce952b 178
57d816a1 179#ifdef CONFIG_PRINTK
533574c6 180static const char * const logtypes[] = {
4da35113
JM
181 "emergency",
182 "alert",
183 "critical",
184 "error",
185 "warning",
186 "notice",
187 "info",
188 "debug",
189};
190
c2cf52eb 191void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
4da35113
JM
192{
193 struct super_block *sb = fs_info->sb;
194 char lvl[4];
195 struct va_format vaf;
196 va_list args;
197 const char *type = logtypes[4];
533574c6 198 int kern_level;
4da35113
JM
199
200 va_start(args, fmt);
201
533574c6
JP
202 kern_level = printk_get_level(fmt);
203 if (kern_level) {
204 size_t size = printk_skip_level(fmt) - fmt;
205 memcpy(lvl, fmt, size);
206 lvl[size] = '\0';
207 fmt += size;
208 type = logtypes[kern_level - '0'];
4da35113
JM
209 } else
210 *lvl = '\0';
211
212 vaf.fmt = fmt;
213 vaf.va = &args;
533574c6 214
c2cf52eb 215 printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf);
533574c6
JP
216
217 va_end(args);
218}
533574c6 219#endif
acce952b 220
49b25e05
JM
221/*
222 * We only mark the transaction aborted and then set the file system read-only.
223 * This will prevent new transactions from starting or trying to join this
224 * one.
225 *
226 * This means that error recovery at the call site is limited to freeing
227 * any local memory allocations and passing the error code up without
228 * further cleanup. The transaction should complete as it normally would
229 * in the call path but will return -EIO.
230 *
231 * We'll complete the cleanup in btrfs_end_transaction and
232 * btrfs_commit_transaction.
233 */
c0d19e2b 234__cold
49b25e05
JM
235void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
236 struct btrfs_root *root, const char *function,
237 unsigned int line, int errno)
238{
49b25e05
JM
239 trans->aborted = errno;
240 /* Nothing used. The other threads that have joined this
241 * transaction may be able to continue. */
c92f6be3 242 if (!trans->blocks_used && list_empty(&trans->new_bgs)) {
69ce977a
MX
243 const char *errstr;
244
08748810 245 errstr = btrfs_decode_error(errno);
c2cf52eb
SK
246 btrfs_warn(root->fs_info,
247 "%s:%d: Aborting unused transaction(%s).",
248 function, line, errstr);
acce952b 249 return;
49b25e05 250 }
8d25a086 251 ACCESS_ONCE(trans->transaction->aborted) = errno;
501407aa
JB
252 /* Wake up anybody who may be waiting on this transaction */
253 wake_up(&root->fs_info->transaction_wait);
254 wake_up(&root->fs_info->transaction_blocked_wait);
49b25e05
JM
255 __btrfs_std_error(root->fs_info, function, line, errno, NULL);
256}
8c342930
JM
257/*
258 * __btrfs_panic decodes unexpected, fatal errors from the caller,
259 * issues an alert, and either panics or BUGs, depending on mount options.
260 */
c0d19e2b 261__cold
8c342930
JM
262void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
263 unsigned int line, int errno, const char *fmt, ...)
264{
8c342930
JM
265 char *s_id = "<unknown>";
266 const char *errstr;
267 struct va_format vaf = { .fmt = fmt };
268 va_list args;
acce952b 269
8c342930
JM
270 if (fs_info)
271 s_id = fs_info->sb->s_id;
acce952b 272
8c342930
JM
273 va_start(args, fmt);
274 vaf.va = &args;
275
08748810 276 errstr = btrfs_decode_error(errno);
aa43a17c 277 if (fs_info && (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR))
08748810
DS
278 panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n",
279 s_id, function, line, &vaf, errno, errstr);
8c342930 280
efe120a0
FH
281 btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)",
282 function, line, &vaf, errno, errstr);
8c342930
JM
283 va_end(args);
284 /* Caller calls BUG() */
acce952b 285}
286
d397712b 287static void btrfs_put_super(struct super_block *sb)
b18c6685 288{
3abdbd78 289 close_ctree(btrfs_sb(sb)->tree_root);
75dfe396
CM
290}
291
95e05289 292enum {
73f73415 293 Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum,
287a0ab9
JB
294 Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd,
295 Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress,
261507a0
LZ
296 Opt_compress_type, Opt_compress_force, Opt_compress_force_type,
297 Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard,
70f6d82e
OS
298 Opt_space_cache, Opt_space_cache_version, Opt_clear_cache,
299 Opt_user_subvol_rm_allowed, Opt_enospc_debug, Opt_subvolrootid,
300 Opt_defrag, Opt_inode_cache, Opt_no_space_cache, Opt_recovery,
301 Opt_skip_balance, Opt_check_integrity,
302 Opt_check_integrity_including_extent_data,
f420ee1e 303 Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree,
e07a2ade 304 Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard,
a258af7a 305 Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow,
8dcddfa0 306 Opt_datasum, Opt_treelog, Opt_noinode_cache, Opt_usebackuproot,
fed8f166 307 Opt_nologreplay, Opt_norecovery,
d0bd4560
JB
308#ifdef CONFIG_BTRFS_DEBUG
309 Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all,
310#endif
9555c6c1 311 Opt_err,
95e05289
CM
312};
313
4d4ab6d6 314static const match_table_t tokens = {
dfe25020 315 {Opt_degraded, "degraded"},
95e05289 316 {Opt_subvol, "subvol=%s"},
1493381f 317 {Opt_subvolid, "subvolid=%s"},
43e570b0 318 {Opt_device, "device=%s"},
b6cda9bc 319 {Opt_nodatasum, "nodatasum"},
d399167d 320 {Opt_datasum, "datasum"},
be20aa9d 321 {Opt_nodatacow, "nodatacow"},
a258af7a 322 {Opt_datacow, "datacow"},
21ad10cf 323 {Opt_nobarrier, "nobarrier"},
842bef58 324 {Opt_barrier, "barrier"},
6f568d35 325 {Opt_max_inline, "max_inline=%s"},
8f662a76 326 {Opt_alloc_start, "alloc_start=%s"},
4543df7e 327 {Opt_thread_pool, "thread_pool=%d"},
c8b97818 328 {Opt_compress, "compress"},
261507a0 329 {Opt_compress_type, "compress=%s"},
a555f810 330 {Opt_compress_force, "compress-force"},
261507a0 331 {Opt_compress_force_type, "compress-force=%s"},
e18e4809 332 {Opt_ssd, "ssd"},
451d7585 333 {Opt_ssd_spread, "ssd_spread"},
3b30c22f 334 {Opt_nossd, "nossd"},
bd0330ad 335 {Opt_acl, "acl"},
33268eaf 336 {Opt_noacl, "noacl"},
3a5e1404 337 {Opt_notreelog, "notreelog"},
a88998f2 338 {Opt_treelog, "treelog"},
96da0919 339 {Opt_nologreplay, "nologreplay"},
fed8f166 340 {Opt_norecovery, "norecovery"},
dccae999 341 {Opt_flushoncommit, "flushoncommit"},
2c9ee856 342 {Opt_noflushoncommit, "noflushoncommit"},
97e728d4 343 {Opt_ratio, "metadata_ratio=%d"},
e244a0ae 344 {Opt_discard, "discard"},
e07a2ade 345 {Opt_nodiscard, "nodiscard"},
0af3d00b 346 {Opt_space_cache, "space_cache"},
70f6d82e 347 {Opt_space_cache_version, "space_cache=%s"},
88c2ba3b 348 {Opt_clear_cache, "clear_cache"},
4260f7c7 349 {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"},
91435650 350 {Opt_enospc_debug, "enospc_debug"},
53036293 351 {Opt_noenospc_debug, "noenospc_debug"},
e15d0542 352 {Opt_subvolrootid, "subvolrootid=%d"},
4cb5300b 353 {Opt_defrag, "autodefrag"},
fc0ca9af 354 {Opt_nodefrag, "noautodefrag"},
4b9465cb 355 {Opt_inode_cache, "inode_cache"},
3818aea2 356 {Opt_noinode_cache, "noinode_cache"},
8965593e 357 {Opt_no_space_cache, "nospace_cache"},
8dcddfa0
QW
358 {Opt_recovery, "recovery"}, /* deprecated */
359 {Opt_usebackuproot, "usebackuproot"},
9555c6c1 360 {Opt_skip_balance, "skip_balance"},
21adbd5c
SB
361 {Opt_check_integrity, "check_int"},
362 {Opt_check_integrity_including_extent_data, "check_int_data"},
363 {Opt_check_integrity_print_mask, "check_int_print_mask=%d"},
f420ee1e 364 {Opt_rescan_uuid_tree, "rescan_uuid_tree"},
8c342930 365 {Opt_fatal_errors, "fatal_errors=%s"},
8b87dc17 366 {Opt_commit_interval, "commit=%d"},
d0bd4560
JB
367#ifdef CONFIG_BTRFS_DEBUG
368 {Opt_fragment_data, "fragment=data"},
369 {Opt_fragment_metadata, "fragment=metadata"},
370 {Opt_fragment_all, "fragment=all"},
371#endif
33268eaf 372 {Opt_err, NULL},
95e05289
CM
373};
374
edf24abe
CH
375/*
376 * Regular mount options parser. Everything that is needed only when
377 * reading in a new superblock is parsed here.
49b25e05 378 * XXX JDM: This needs to be cleaned up for remount.
edf24abe 379 */
96da0919
QW
380int btrfs_parse_options(struct btrfs_root *root, char *options,
381 unsigned long new_flags)
95e05289 382{
edf24abe 383 struct btrfs_fs_info *info = root->fs_info;
95e05289 384 substring_t args[MAX_OPT_ARGS];
73bc1876
JB
385 char *p, *num, *orig = NULL;
386 u64 cache_gen;
4543df7e 387 int intarg;
a7a3f7ca 388 int ret = 0;
261507a0
LZ
389 char *compress_type;
390 bool compress_force = false;
b7c47bbb
TI
391 enum btrfs_compression_type saved_compress_type;
392 bool saved_compress_force;
393 int no_compress = 0;
b6cda9bc 394
6c41761f 395 cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy);
70f6d82e
OS
396 if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE))
397 btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE);
398 else if (cache_gen)
73bc1876
JB
399 btrfs_set_opt(info->mount_opt, SPACE_CACHE);
400
96da0919
QW
401 /*
402 * Even the options are empty, we still need to do extra check
403 * against new flags
404 */
95e05289 405 if (!options)
96da0919 406 goto check;
95e05289 407
be20aa9d
CM
408 /*
409 * strsep changes the string, duplicate it because parse_options
410 * gets called twice
411 */
412 options = kstrdup(options, GFP_NOFS);
413 if (!options)
414 return -ENOMEM;
415
da495ecc 416 orig = options;
be20aa9d 417
edf24abe 418 while ((p = strsep(&options, ",")) != NULL) {
95e05289
CM
419 int token;
420 if (!*p)
421 continue;
422
423 token = match_token(p, tokens, args);
424 switch (token) {
dfe25020 425 case Opt_degraded:
efe120a0 426 btrfs_info(root->fs_info, "allowing degraded mounts");
edf24abe 427 btrfs_set_opt(info->mount_opt, DEGRADED);
dfe25020 428 break;
95e05289 429 case Opt_subvol:
73f73415 430 case Opt_subvolid:
e15d0542 431 case Opt_subvolrootid:
43e570b0 432 case Opt_device:
edf24abe 433 /*
43e570b0 434 * These are parsed by btrfs_parse_early_options
edf24abe
CH
435 * and can be happily ignored here.
436 */
b6cda9bc
CM
437 break;
438 case Opt_nodatasum:
07802534
QW
439 btrfs_set_and_info(root, NODATASUM,
440 "setting nodatasum");
be20aa9d 441 break;
d399167d 442 case Opt_datasum:
07802534
QW
443 if (btrfs_test_opt(root, NODATASUM)) {
444 if (btrfs_test_opt(root, NODATACOW))
445 btrfs_info(root->fs_info, "setting datasum, datacow enabled");
446 else
447 btrfs_info(root->fs_info, "setting datasum");
448 }
d399167d
QW
449 btrfs_clear_opt(info->mount_opt, NODATACOW);
450 btrfs_clear_opt(info->mount_opt, NODATASUM);
451 break;
be20aa9d 452 case Opt_nodatacow:
07802534
QW
453 if (!btrfs_test_opt(root, NODATACOW)) {
454 if (!btrfs_test_opt(root, COMPRESS) ||
455 !btrfs_test_opt(root, FORCE_COMPRESS)) {
efe120a0 456 btrfs_info(root->fs_info,
07802534
QW
457 "setting nodatacow, compression disabled");
458 } else {
459 btrfs_info(root->fs_info, "setting nodatacow");
460 }
bedb2cca 461 }
bedb2cca
AP
462 btrfs_clear_opt(info->mount_opt, COMPRESS);
463 btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
edf24abe
CH
464 btrfs_set_opt(info->mount_opt, NODATACOW);
465 btrfs_set_opt(info->mount_opt, NODATASUM);
95e05289 466 break;
a258af7a 467 case Opt_datacow:
07802534
QW
468 btrfs_clear_and_info(root, NODATACOW,
469 "setting datacow");
a258af7a 470 break;
a555f810 471 case Opt_compress_force:
261507a0
LZ
472 case Opt_compress_force_type:
473 compress_force = true;
1c697d4a 474 /* Fallthrough */
261507a0
LZ
475 case Opt_compress:
476 case Opt_compress_type:
b7c47bbb
TI
477 saved_compress_type = btrfs_test_opt(root, COMPRESS) ?
478 info->compress_type : BTRFS_COMPRESS_NONE;
479 saved_compress_force =
480 btrfs_test_opt(root, FORCE_COMPRESS);
261507a0
LZ
481 if (token == Opt_compress ||
482 token == Opt_compress_force ||
483 strcmp(args[0].from, "zlib") == 0) {
484 compress_type = "zlib";
485 info->compress_type = BTRFS_COMPRESS_ZLIB;
063849ea 486 btrfs_set_opt(info->mount_opt, COMPRESS);
bedb2cca
AP
487 btrfs_clear_opt(info->mount_opt, NODATACOW);
488 btrfs_clear_opt(info->mount_opt, NODATASUM);
b7c47bbb 489 no_compress = 0;
a6fa6fae
LZ
490 } else if (strcmp(args[0].from, "lzo") == 0) {
491 compress_type = "lzo";
492 info->compress_type = BTRFS_COMPRESS_LZO;
063849ea 493 btrfs_set_opt(info->mount_opt, COMPRESS);
bedb2cca
AP
494 btrfs_clear_opt(info->mount_opt, NODATACOW);
495 btrfs_clear_opt(info->mount_opt, NODATASUM);
2b0ce2c2 496 btrfs_set_fs_incompat(info, COMPRESS_LZO);
b7c47bbb 497 no_compress = 0;
063849ea
AH
498 } else if (strncmp(args[0].from, "no", 2) == 0) {
499 compress_type = "no";
063849ea
AH
500 btrfs_clear_opt(info->mount_opt, COMPRESS);
501 btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
502 compress_force = false;
b7c47bbb 503 no_compress++;
261507a0
LZ
504 } else {
505 ret = -EINVAL;
506 goto out;
507 }
508
261507a0 509 if (compress_force) {
b7c47bbb 510 btrfs_set_opt(info->mount_opt, FORCE_COMPRESS);
143f3636 511 } else {
4027e0f4
WS
512 /*
513 * If we remount from compress-force=xxx to
514 * compress=xxx, we need clear FORCE_COMPRESS
515 * flag, otherwise, there is no way for users
516 * to disable forcible compression separately.
517 */
518 btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS);
a7e252af 519 }
b7c47bbb
TI
520 if ((btrfs_test_opt(root, COMPRESS) &&
521 (info->compress_type != saved_compress_type ||
522 compress_force != saved_compress_force)) ||
523 (!btrfs_test_opt(root, COMPRESS) &&
524 no_compress == 1)) {
525 btrfs_info(root->fs_info,
526 "%s %s compression",
527 (compress_force) ? "force" : "use",
528 compress_type);
529 }
530 compress_force = false;
a555f810 531 break;
e18e4809 532 case Opt_ssd:
07802534
QW
533 btrfs_set_and_info(root, SSD,
534 "use ssd allocation scheme");
e18e4809 535 break;
451d7585 536 case Opt_ssd_spread:
07802534
QW
537 btrfs_set_and_info(root, SSD_SPREAD,
538 "use spread ssd allocation scheme");
2aa06a35 539 btrfs_set_opt(info->mount_opt, SSD);
451d7585 540 break;
3b30c22f 541 case Opt_nossd:
2aa06a35 542 btrfs_set_and_info(root, NOSSD,
07802534 543 "not using ssd allocation scheme");
3b30c22f
CM
544 btrfs_clear_opt(info->mount_opt, SSD);
545 break;
842bef58 546 case Opt_barrier:
07802534
QW
547 btrfs_clear_and_info(root, NOBARRIER,
548 "turning on barriers");
842bef58 549 break;
21ad10cf 550 case Opt_nobarrier:
07802534
QW
551 btrfs_set_and_info(root, NOBARRIER,
552 "turning off barriers");
21ad10cf 553 break;
4543df7e 554 case Opt_thread_pool:
2c334e87
WS
555 ret = match_int(&args[0], &intarg);
556 if (ret) {
557 goto out;
558 } else if (intarg > 0) {
4543df7e 559 info->thread_pool_size = intarg;
2c334e87
WS
560 } else {
561 ret = -EINVAL;
562 goto out;
563 }
4543df7e 564 break;
6f568d35 565 case Opt_max_inline:
edf24abe
CH
566 num = match_strdup(&args[0]);
567 if (num) {
91748467 568 info->max_inline = memparse(num, NULL);
edf24abe
CH
569 kfree(num);
570
15ada040 571 if (info->max_inline) {
feb5f965 572 info->max_inline = min_t(u64,
15ada040
CM
573 info->max_inline,
574 root->sectorsize);
575 }
efe120a0 576 btrfs_info(root->fs_info, "max_inline at %llu",
c1c9ff7c 577 info->max_inline);
2c334e87
WS
578 } else {
579 ret = -ENOMEM;
580 goto out;
6f568d35
CM
581 }
582 break;
8f662a76 583 case Opt_alloc_start:
edf24abe
CH
584 num = match_strdup(&args[0]);
585 if (num) {
c018daec 586 mutex_lock(&info->chunk_mutex);
91748467 587 info->alloc_start = memparse(num, NULL);
c018daec 588 mutex_unlock(&info->chunk_mutex);
edf24abe 589 kfree(num);
efe120a0 590 btrfs_info(root->fs_info, "allocations start at %llu",
c1c9ff7c 591 info->alloc_start);
2c334e87
WS
592 } else {
593 ret = -ENOMEM;
594 goto out;
8f662a76
CM
595 }
596 break;
bd0330ad 597 case Opt_acl:
45ff35d6 598#ifdef CONFIG_BTRFS_FS_POSIX_ACL
bd0330ad
QW
599 root->fs_info->sb->s_flags |= MS_POSIXACL;
600 break;
45ff35d6
GZ
601#else
602 btrfs_err(root->fs_info,
603 "support for ACL not compiled in!");
604 ret = -EINVAL;
605 goto out;
606#endif
33268eaf
JB
607 case Opt_noacl:
608 root->fs_info->sb->s_flags &= ~MS_POSIXACL;
609 break;
3a5e1404 610 case Opt_notreelog:
07802534
QW
611 btrfs_set_and_info(root, NOTREELOG,
612 "disabling tree log");
a88998f2
QW
613 break;
614 case Opt_treelog:
07802534
QW
615 btrfs_clear_and_info(root, NOTREELOG,
616 "enabling tree log");
3a5e1404 617 break;
fed8f166 618 case Opt_norecovery:
96da0919
QW
619 case Opt_nologreplay:
620 btrfs_set_and_info(root, NOLOGREPLAY,
621 "disabling log replay at mount time");
622 break;
dccae999 623 case Opt_flushoncommit:
07802534
QW
624 btrfs_set_and_info(root, FLUSHONCOMMIT,
625 "turning on flush-on-commit");
dccae999 626 break;
2c9ee856 627 case Opt_noflushoncommit:
07802534
QW
628 btrfs_clear_and_info(root, FLUSHONCOMMIT,
629 "turning off flush-on-commit");
2c9ee856 630 break;
97e728d4 631 case Opt_ratio:
2c334e87
WS
632 ret = match_int(&args[0], &intarg);
633 if (ret) {
634 goto out;
635 } else if (intarg >= 0) {
97e728d4 636 info->metadata_ratio = intarg;
efe120a0 637 btrfs_info(root->fs_info, "metadata ratio %d",
97e728d4 638 info->metadata_ratio);
2c334e87
WS
639 } else {
640 ret = -EINVAL;
641 goto out;
97e728d4
JB
642 }
643 break;
e244a0ae 644 case Opt_discard:
07802534
QW
645 btrfs_set_and_info(root, DISCARD,
646 "turning on discard");
e244a0ae 647 break;
e07a2ade 648 case Opt_nodiscard:
07802534
QW
649 btrfs_clear_and_info(root, DISCARD,
650 "turning off discard");
e07a2ade 651 break;
0af3d00b 652 case Opt_space_cache:
70f6d82e
OS
653 case Opt_space_cache_version:
654 if (token == Opt_space_cache ||
655 strcmp(args[0].from, "v1") == 0) {
656 btrfs_clear_opt(root->fs_info->mount_opt,
657 FREE_SPACE_TREE);
658 btrfs_set_and_info(root, SPACE_CACHE,
659 "enabling disk space caching");
660 } else if (strcmp(args[0].from, "v2") == 0) {
661 btrfs_clear_opt(root->fs_info->mount_opt,
662 SPACE_CACHE);
663 btrfs_set_and_info(root, FREE_SPACE_TREE,
664 "enabling free space tree");
665 } else {
666 ret = -EINVAL;
667 goto out;
668 }
0de90876 669 break;
f420ee1e
SB
670 case Opt_rescan_uuid_tree:
671 btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE);
672 break;
73bc1876 673 case Opt_no_space_cache:
70f6d82e
OS
674 if (btrfs_test_opt(root, SPACE_CACHE)) {
675 btrfs_clear_and_info(root, SPACE_CACHE,
676 "disabling disk space caching");
677 }
678 if (btrfs_test_opt(root, FREE_SPACE_TREE)) {
679 btrfs_clear_and_info(root, FREE_SPACE_TREE,
680 "disabling free space tree");
681 }
73bc1876 682 break;
4b9465cb 683 case Opt_inode_cache:
7e1876ac 684 btrfs_set_pending_and_info(info, INODE_MAP_CACHE,
07802534 685 "enabling inode map caching");
3818aea2
QW
686 break;
687 case Opt_noinode_cache:
7e1876ac 688 btrfs_clear_pending_and_info(info, INODE_MAP_CACHE,
07802534 689 "disabling inode map caching");
4b9465cb 690 break;
88c2ba3b 691 case Opt_clear_cache:
07802534
QW
692 btrfs_set_and_info(root, CLEAR_CACHE,
693 "force clearing of disk cache");
0af3d00b 694 break;
4260f7c7
SW
695 case Opt_user_subvol_rm_allowed:
696 btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED);
697 break;
91435650
CM
698 case Opt_enospc_debug:
699 btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG);
700 break;
53036293
QW
701 case Opt_noenospc_debug:
702 btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG);
703 break;
4cb5300b 704 case Opt_defrag:
07802534
QW
705 btrfs_set_and_info(root, AUTO_DEFRAG,
706 "enabling auto defrag");
4cb5300b 707 break;
fc0ca9af 708 case Opt_nodefrag:
07802534
QW
709 btrfs_clear_and_info(root, AUTO_DEFRAG,
710 "disabling auto defrag");
fc0ca9af 711 break;
af31f5e5 712 case Opt_recovery:
8dcddfa0
QW
713 btrfs_warn(root->fs_info,
714 "'recovery' is deprecated, use 'usebackuproot' instead");
715 case Opt_usebackuproot:
716 btrfs_info(root->fs_info,
717 "trying to use backup root at mount time");
718 btrfs_set_opt(info->mount_opt, USEBACKUPROOT);
af31f5e5 719 break;
9555c6c1
ID
720 case Opt_skip_balance:
721 btrfs_set_opt(info->mount_opt, SKIP_BALANCE);
722 break;
21adbd5c
SB
723#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
724 case Opt_check_integrity_including_extent_data:
efe120a0
FH
725 btrfs_info(root->fs_info,
726 "enabling check integrity including extent data");
21adbd5c
SB
727 btrfs_set_opt(info->mount_opt,
728 CHECK_INTEGRITY_INCLUDING_EXTENT_DATA);
729 btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY);
730 break;
731 case Opt_check_integrity:
efe120a0 732 btrfs_info(root->fs_info, "enabling check integrity");
21adbd5c
SB
733 btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY);
734 break;
735 case Opt_check_integrity_print_mask:
2c334e87
WS
736 ret = match_int(&args[0], &intarg);
737 if (ret) {
738 goto out;
739 } else if (intarg >= 0) {
21adbd5c 740 info->check_integrity_print_mask = intarg;
efe120a0 741 btrfs_info(root->fs_info, "check_integrity_print_mask 0x%x",
21adbd5c 742 info->check_integrity_print_mask);
2c334e87
WS
743 } else {
744 ret = -EINVAL;
745 goto out;
21adbd5c
SB
746 }
747 break;
748#else
749 case Opt_check_integrity_including_extent_data:
750 case Opt_check_integrity:
751 case Opt_check_integrity_print_mask:
efe120a0
FH
752 btrfs_err(root->fs_info,
753 "support for check_integrity* not compiled in!");
21adbd5c
SB
754 ret = -EINVAL;
755 goto out;
756#endif
8c342930
JM
757 case Opt_fatal_errors:
758 if (strcmp(args[0].from, "panic") == 0)
759 btrfs_set_opt(info->mount_opt,
760 PANIC_ON_FATAL_ERROR);
761 else if (strcmp(args[0].from, "bug") == 0)
762 btrfs_clear_opt(info->mount_opt,
763 PANIC_ON_FATAL_ERROR);
764 else {
765 ret = -EINVAL;
766 goto out;
767 }
768 break;
8b87dc17
DS
769 case Opt_commit_interval:
770 intarg = 0;
771 ret = match_int(&args[0], &intarg);
772 if (ret < 0) {
efe120a0 773 btrfs_err(root->fs_info, "invalid commit interval");
8b87dc17
DS
774 ret = -EINVAL;
775 goto out;
776 }
777 if (intarg > 0) {
778 if (intarg > 300) {
efe120a0 779 btrfs_warn(root->fs_info, "excessive commit interval %d",
8b87dc17
DS
780 intarg);
781 }
782 info->commit_interval = intarg;
783 } else {
efe120a0 784 btrfs_info(root->fs_info, "using default commit interval %ds",
8b87dc17
DS
785 BTRFS_DEFAULT_COMMIT_INTERVAL);
786 info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
787 }
788 break;
d0bd4560
JB
789#ifdef CONFIG_BTRFS_DEBUG
790 case Opt_fragment_all:
791 btrfs_info(root->fs_info, "fragmenting all space");
792 btrfs_set_opt(info->mount_opt, FRAGMENT_DATA);
793 btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA);
794 break;
795 case Opt_fragment_metadata:
796 btrfs_info(root->fs_info, "fragmenting metadata");
797 btrfs_set_opt(info->mount_opt,
798 FRAGMENT_METADATA);
799 break;
800 case Opt_fragment_data:
801 btrfs_info(root->fs_info, "fragmenting data");
802 btrfs_set_opt(info->mount_opt, FRAGMENT_DATA);
803 break;
804#endif
a7a3f7ca 805 case Opt_err:
efe120a0 806 btrfs_info(root->fs_info, "unrecognized mount option '%s'", p);
a7a3f7ca
SW
807 ret = -EINVAL;
808 goto out;
95e05289 809 default:
be20aa9d 810 break;
95e05289
CM
811 }
812 }
96da0919
QW
813check:
814 /*
815 * Extra check for current option against current flag
816 */
817 if (btrfs_test_opt(root, NOLOGREPLAY) && !(new_flags & MS_RDONLY)) {
818 btrfs_err(root->fs_info,
819 "nologreplay must be used with ro mount option");
820 ret = -EINVAL;
821 }
a7a3f7ca 822out:
70f6d82e
OS
823 if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE) &&
824 !btrfs_test_opt(root, FREE_SPACE_TREE) &&
825 !btrfs_test_opt(root, CLEAR_CACHE)) {
826 btrfs_err(root->fs_info, "cannot disable free space tree");
827 ret = -EINVAL;
828
829 }
73bc1876 830 if (!ret && btrfs_test_opt(root, SPACE_CACHE))
efe120a0 831 btrfs_info(root->fs_info, "disk space caching is enabled");
70f6d82e
OS
832 if (!ret && btrfs_test_opt(root, FREE_SPACE_TREE))
833 btrfs_info(root->fs_info, "using free space tree");
da495ecc 834 kfree(orig);
a7a3f7ca 835 return ret;
edf24abe
CH
836}
837
838/*
839 * Parse mount options that are required early in the mount process.
840 *
841 * All other options will be parsed on much later in the mount process and
842 * only when we need to allocate a new super block.
843 */
97288f2c 844static int btrfs_parse_early_options(const char *options, fmode_t flags,
73f73415 845 void *holder, char **subvol_name, u64 *subvol_objectid,
5e2a4b25 846 struct btrfs_fs_devices **fs_devices)
edf24abe
CH
847{
848 substring_t args[MAX_OPT_ARGS];
83c8c9bd 849 char *device_name, *opts, *orig, *p;
1493381f 850 char *num = NULL;
edf24abe
CH
851 int error = 0;
852
853 if (!options)
830c4adb 854 return 0;
edf24abe
CH
855
856 /*
857 * strsep changes the string, duplicate it because parse_options
858 * gets called twice
859 */
860 opts = kstrdup(options, GFP_KERNEL);
861 if (!opts)
862 return -ENOMEM;
3f3d0bc0 863 orig = opts;
edf24abe
CH
864
865 while ((p = strsep(&opts, ",")) != NULL) {
866 int token;
867 if (!*p)
868 continue;
869
870 token = match_token(p, tokens, args);
871 switch (token) {
872 case Opt_subvol:
a90e8b6f 873 kfree(*subvol_name);
edf24abe 874 *subvol_name = match_strdup(&args[0]);
2c334e87
WS
875 if (!*subvol_name) {
876 error = -ENOMEM;
877 goto out;
878 }
edf24abe 879 break;
73f73415 880 case Opt_subvolid:
1493381f
WS
881 num = match_strdup(&args[0]);
882 if (num) {
883 *subvol_objectid = memparse(num, NULL);
884 kfree(num);
4849f01d 885 /* we want the original fs_tree */
1493381f 886 if (!*subvol_objectid)
4849f01d
JB
887 *subvol_objectid =
888 BTRFS_FS_TREE_OBJECTID;
2c334e87
WS
889 } else {
890 error = -EINVAL;
891 goto out;
4849f01d 892 }
73f73415 893 break;
e15d0542 894 case Opt_subvolrootid:
5e2a4b25 895 printk(KERN_WARNING
efe120a0
FH
896 "BTRFS: 'subvolrootid' mount option is deprecated and has "
897 "no effect\n");
e15d0542 898 break;
43e570b0 899 case Opt_device:
83c8c9bd
JL
900 device_name = match_strdup(&args[0]);
901 if (!device_name) {
902 error = -ENOMEM;
903 goto out;
904 }
905 error = btrfs_scan_one_device(device_name,
43e570b0 906 flags, holder, fs_devices);
83c8c9bd 907 kfree(device_name);
43e570b0 908 if (error)
830c4adb 909 goto out;
43e570b0 910 break;
edf24abe
CH
911 default:
912 break;
913 }
914 }
915
830c4adb 916out:
3f3d0bc0 917 kfree(orig);
edf24abe 918 return error;
95e05289
CM
919}
920
05dbe683
OS
921static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info,
922 u64 subvol_objectid)
73f73415 923{
815745cf 924 struct btrfs_root *root = fs_info->tree_root;
05dbe683
OS
925 struct btrfs_root *fs_root;
926 struct btrfs_root_ref *root_ref;
927 struct btrfs_inode_ref *inode_ref;
928 struct btrfs_key key;
929 struct btrfs_path *path = NULL;
930 char *name = NULL, *ptr;
931 u64 dirid;
932 int len;
933 int ret;
934
935 path = btrfs_alloc_path();
936 if (!path) {
937 ret = -ENOMEM;
938 goto err;
939 }
940 path->leave_spinning = 1;
941
942 name = kmalloc(PATH_MAX, GFP_NOFS);
943 if (!name) {
944 ret = -ENOMEM;
945 goto err;
946 }
947 ptr = name + PATH_MAX - 1;
948 ptr[0] = '\0';
73f73415
JB
949
950 /*
05dbe683
OS
951 * Walk up the subvolume trees in the tree of tree roots by root
952 * backrefs until we hit the top-level subvolume.
73f73415 953 */
05dbe683
OS
954 while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) {
955 key.objectid = subvol_objectid;
956 key.type = BTRFS_ROOT_BACKREF_KEY;
957 key.offset = (u64)-1;
958
959 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
960 if (ret < 0) {
961 goto err;
962 } else if (ret > 0) {
963 ret = btrfs_previous_item(root, path, subvol_objectid,
964 BTRFS_ROOT_BACKREF_KEY);
965 if (ret < 0) {
966 goto err;
967 } else if (ret > 0) {
968 ret = -ENOENT;
969 goto err;
970 }
971 }
972
973 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
974 subvol_objectid = key.offset;
975
976 root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
977 struct btrfs_root_ref);
978 len = btrfs_root_ref_name_len(path->nodes[0], root_ref);
979 ptr -= len + 1;
980 if (ptr < name) {
981 ret = -ENAMETOOLONG;
982 goto err;
983 }
984 read_extent_buffer(path->nodes[0], ptr + 1,
985 (unsigned long)(root_ref + 1), len);
986 ptr[0] = '/';
987 dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref);
988 btrfs_release_path(path);
989
990 key.objectid = subvol_objectid;
991 key.type = BTRFS_ROOT_ITEM_KEY;
992 key.offset = (u64)-1;
993 fs_root = btrfs_read_fs_root_no_name(fs_info, &key);
994 if (IS_ERR(fs_root)) {
995 ret = PTR_ERR(fs_root);
996 goto err;
997 }
998
999 /*
1000 * Walk up the filesystem tree by inode refs until we hit the
1001 * root directory.
1002 */
1003 while (dirid != BTRFS_FIRST_FREE_OBJECTID) {
1004 key.objectid = dirid;
1005 key.type = BTRFS_INODE_REF_KEY;
1006 key.offset = (u64)-1;
1007
1008 ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0);
1009 if (ret < 0) {
1010 goto err;
1011 } else if (ret > 0) {
1012 ret = btrfs_previous_item(fs_root, path, dirid,
1013 BTRFS_INODE_REF_KEY);
1014 if (ret < 0) {
1015 goto err;
1016 } else if (ret > 0) {
1017 ret = -ENOENT;
1018 goto err;
1019 }
1020 }
1021
1022 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
1023 dirid = key.offset;
1024
1025 inode_ref = btrfs_item_ptr(path->nodes[0],
1026 path->slots[0],
1027 struct btrfs_inode_ref);
1028 len = btrfs_inode_ref_name_len(path->nodes[0],
1029 inode_ref);
1030 ptr -= len + 1;
1031 if (ptr < name) {
1032 ret = -ENAMETOOLONG;
1033 goto err;
1034 }
1035 read_extent_buffer(path->nodes[0], ptr + 1,
1036 (unsigned long)(inode_ref + 1), len);
1037 ptr[0] = '/';
1038 btrfs_release_path(path);
1039 }
73f73415
JB
1040 }
1041
05dbe683
OS
1042 btrfs_free_path(path);
1043 if (ptr == name + PATH_MAX - 1) {
1044 name[0] = '/';
1045 name[1] = '\0';
1046 } else {
1047 memmove(name, ptr, name + PATH_MAX - ptr);
1048 }
1049 return name;
1050
1051err:
1052 btrfs_free_path(path);
1053 kfree(name);
1054 return ERR_PTR(ret);
1055}
1056
1057static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid)
1058{
1059 struct btrfs_root *root = fs_info->tree_root;
1060 struct btrfs_dir_item *di;
1061 struct btrfs_path *path;
1062 struct btrfs_key location;
1063 u64 dir_id;
1064
73f73415
JB
1065 path = btrfs_alloc_path();
1066 if (!path)
05dbe683 1067 return -ENOMEM;
73f73415
JB
1068 path->leave_spinning = 1;
1069
1070 /*
1071 * Find the "default" dir item which points to the root item that we
1072 * will mount by default if we haven't been given a specific subvolume
1073 * to mount.
1074 */
815745cf 1075 dir_id = btrfs_super_root_dir(fs_info->super_copy);
73f73415 1076 di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0);
b0839166
JL
1077 if (IS_ERR(di)) {
1078 btrfs_free_path(path);
05dbe683 1079 return PTR_ERR(di);
b0839166 1080 }
73f73415
JB
1081 if (!di) {
1082 /*
1083 * Ok the default dir item isn't there. This is weird since
1084 * it's always been there, but don't freak out, just try and
05dbe683 1085 * mount the top-level subvolume.
73f73415
JB
1086 */
1087 btrfs_free_path(path);
05dbe683
OS
1088 *objectid = BTRFS_FS_TREE_OBJECTID;
1089 return 0;
73f73415
JB
1090 }
1091
1092 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location);
1093 btrfs_free_path(path);
05dbe683
OS
1094 *objectid = location.objectid;
1095 return 0;
73f73415
JB
1096}
1097
d397712b 1098static int btrfs_fill_super(struct super_block *sb,
8a4b83cc 1099 struct btrfs_fs_devices *fs_devices,
d397712b 1100 void *data, int silent)
75dfe396 1101{
d397712b 1102 struct inode *inode;
815745cf 1103 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
5d4f98a2 1104 struct btrfs_key key;
39279cc3 1105 int err;
a429e513 1106
39279cc3
CM
1107 sb->s_maxbytes = MAX_LFS_FILESIZE;
1108 sb->s_magic = BTRFS_SUPER_MAGIC;
1109 sb->s_op = &btrfs_super_ops;
af53d29a 1110 sb->s_d_op = &btrfs_dentry_operations;
be6e8dc0 1111 sb->s_export_op = &btrfs_export_ops;
5103e947 1112 sb->s_xattr = btrfs_xattr_handlers;
39279cc3 1113 sb->s_time_gran = 1;
0eda294d 1114#ifdef CONFIG_BTRFS_FS_POSIX_ACL
33268eaf 1115 sb->s_flags |= MS_POSIXACL;
49cf6f45 1116#endif
0c4d2d95 1117 sb->s_flags |= MS_I_VERSION;
da2f0f74 1118 sb->s_iflags |= SB_I_CGROUPWB;
ad2b2c80
AV
1119 err = open_ctree(sb, fs_devices, (char *)data);
1120 if (err) {
efe120a0 1121 printk(KERN_ERR "BTRFS: open_ctree failed\n");
ad2b2c80 1122 return err;
a429e513
CM
1123 }
1124
5d4f98a2
YZ
1125 key.objectid = BTRFS_FIRST_FREE_OBJECTID;
1126 key.type = BTRFS_INODE_ITEM_KEY;
1127 key.offset = 0;
98c7089c 1128 inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL);
5d4f98a2
YZ
1129 if (IS_ERR(inode)) {
1130 err = PTR_ERR(inode);
39279cc3 1131 goto fail_close;
f254e52c 1132 }
f254e52c 1133
48fde701
AV
1134 sb->s_root = d_make_root(inode);
1135 if (!sb->s_root) {
39279cc3
CM
1136 err = -ENOMEM;
1137 goto fail_close;
f254e52c 1138 }
58176a96 1139
6885f308 1140 save_mount_options(sb, data);
90a887c9 1141 cleancache_init_fs(sb);
59553edf 1142 sb->s_flags |= MS_ACTIVE;
2619ba1f 1143 return 0;
39279cc3
CM
1144
1145fail_close:
815745cf 1146 close_ctree(fs_info->tree_root);
39279cc3 1147 return err;
2619ba1f
CM
1148}
1149
6bf13c0c 1150int btrfs_sync_fs(struct super_block *sb, int wait)
c5739bba
CM
1151{
1152 struct btrfs_trans_handle *trans;
815745cf
AV
1153 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
1154 struct btrfs_root *root = fs_info->tree_root;
2619ba1f 1155
1abe9b8a 1156 trace_btrfs_sync_fs(wait);
1157
39279cc3 1158 if (!wait) {
815745cf 1159 filemap_flush(fs_info->btree_inode->i_mapping);
39279cc3
CM
1160 return 0;
1161 }
771ed689 1162
b0244199 1163 btrfs_wait_ordered_roots(fs_info, -1);
771ed689 1164
d4edf39b 1165 trans = btrfs_attach_transaction_barrier(root);
60376ce4 1166 if (IS_ERR(trans)) {
354aa0fb 1167 /* no transaction, don't bother */
6b5fe46d
DS
1168 if (PTR_ERR(trans) == -ENOENT) {
1169 /*
1170 * Exit unless we have some pending changes
1171 * that need to go through commit
1172 */
1173 if (fs_info->pending_changes == 0)
1174 return 0;
a53f4f8e
QW
1175 /*
1176 * A non-blocking test if the fs is frozen. We must not
1177 * start a new transaction here otherwise a deadlock
1178 * happens. The pending operations are delayed to the
1179 * next commit after thawing.
1180 */
1181 if (__sb_start_write(sb, SB_FREEZE_WRITE, false))
1182 __sb_end_write(sb, SB_FREEZE_WRITE);
1183 else
1184 return 0;
6b5fe46d 1185 trans = btrfs_start_transaction(root, 0);
6b5fe46d 1186 }
98bd5c54
DS
1187 if (IS_ERR(trans))
1188 return PTR_ERR(trans);
60376ce4 1189 }
bd7de2c9 1190 return btrfs_commit_transaction(trans, root);
2c90e5d6
CM
1191}
1192
34c80b1d 1193static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
a9572a15 1194{
815745cf
AV
1195 struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb);
1196 struct btrfs_root *root = info->tree_root;
200da64e 1197 char *compress_type;
a9572a15
EP
1198
1199 if (btrfs_test_opt(root, DEGRADED))
1200 seq_puts(seq, ",degraded");
1201 if (btrfs_test_opt(root, NODATASUM))
1202 seq_puts(seq, ",nodatasum");
1203 if (btrfs_test_opt(root, NODATACOW))
1204 seq_puts(seq, ",nodatacow");
1205 if (btrfs_test_opt(root, NOBARRIER))
1206 seq_puts(seq, ",nobarrier");
95ac567a 1207 if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE)
c1c9ff7c 1208 seq_printf(seq, ",max_inline=%llu", info->max_inline);
a9572a15 1209 if (info->alloc_start != 0)
c1c9ff7c 1210 seq_printf(seq, ",alloc_start=%llu", info->alloc_start);
a9572a15
EP
1211 if (info->thread_pool_size != min_t(unsigned long,
1212 num_online_cpus() + 2, 8))
1213 seq_printf(seq, ",thread_pool=%d", info->thread_pool_size);
200da64e
TI
1214 if (btrfs_test_opt(root, COMPRESS)) {
1215 if (info->compress_type == BTRFS_COMPRESS_ZLIB)
1216 compress_type = "zlib";
1217 else
1218 compress_type = "lzo";
1219 if (btrfs_test_opt(root, FORCE_COMPRESS))
1220 seq_printf(seq, ",compress-force=%s", compress_type);
1221 else
1222 seq_printf(seq, ",compress=%s", compress_type);
1223 }
c289811c
CM
1224 if (btrfs_test_opt(root, NOSSD))
1225 seq_puts(seq, ",nossd");
451d7585
CM
1226 if (btrfs_test_opt(root, SSD_SPREAD))
1227 seq_puts(seq, ",ssd_spread");
1228 else if (btrfs_test_opt(root, SSD))
a9572a15 1229 seq_puts(seq, ",ssd");
3a5e1404 1230 if (btrfs_test_opt(root, NOTREELOG))
6b65c5c6 1231 seq_puts(seq, ",notreelog");
96da0919
QW
1232 if (btrfs_test_opt(root, NOLOGREPLAY))
1233 seq_puts(seq, ",nologreplay");
dccae999 1234 if (btrfs_test_opt(root, FLUSHONCOMMIT))
6b65c5c6 1235 seq_puts(seq, ",flushoncommit");
20a5239a
MW
1236 if (btrfs_test_opt(root, DISCARD))
1237 seq_puts(seq, ",discard");
a9572a15
EP
1238 if (!(root->fs_info->sb->s_flags & MS_POSIXACL))
1239 seq_puts(seq, ",noacl");
200da64e
TI
1240 if (btrfs_test_opt(root, SPACE_CACHE))
1241 seq_puts(seq, ",space_cache");
70f6d82e
OS
1242 else if (btrfs_test_opt(root, FREE_SPACE_TREE))
1243 seq_puts(seq, ",space_cache=v2");
73bc1876 1244 else
8965593e 1245 seq_puts(seq, ",nospace_cache");
f420ee1e
SB
1246 if (btrfs_test_opt(root, RESCAN_UUID_TREE))
1247 seq_puts(seq, ",rescan_uuid_tree");
200da64e
TI
1248 if (btrfs_test_opt(root, CLEAR_CACHE))
1249 seq_puts(seq, ",clear_cache");
1250 if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
1251 seq_puts(seq, ",user_subvol_rm_allowed");
0942caa3
DS
1252 if (btrfs_test_opt(root, ENOSPC_DEBUG))
1253 seq_puts(seq, ",enospc_debug");
1254 if (btrfs_test_opt(root, AUTO_DEFRAG))
1255 seq_puts(seq, ",autodefrag");
1256 if (btrfs_test_opt(root, INODE_MAP_CACHE))
1257 seq_puts(seq, ",inode_cache");
9555c6c1
ID
1258 if (btrfs_test_opt(root, SKIP_BALANCE))
1259 seq_puts(seq, ",skip_balance");
8507d216
WS
1260#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1261 if (btrfs_test_opt(root, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA))
1262 seq_puts(seq, ",check_int_data");
1263 else if (btrfs_test_opt(root, CHECK_INTEGRITY))
1264 seq_puts(seq, ",check_int");
1265 if (info->check_integrity_print_mask)
1266 seq_printf(seq, ",check_int_print_mask=%d",
1267 info->check_integrity_print_mask);
1268#endif
1269 if (info->metadata_ratio)
1270 seq_printf(seq, ",metadata_ratio=%d",
1271 info->metadata_ratio);
8c342930
JM
1272 if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR))
1273 seq_puts(seq, ",fatal_errors=panic");
8b87dc17
DS
1274 if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL)
1275 seq_printf(seq, ",commit=%d", info->commit_interval);
d0bd4560
JB
1276#ifdef CONFIG_BTRFS_DEBUG
1277 if (btrfs_test_opt(root, FRAGMENT_DATA))
1278 seq_puts(seq, ",fragment=data");
1279 if (btrfs_test_opt(root, FRAGMENT_METADATA))
1280 seq_puts(seq, ",fragment=metadata");
1281#endif
c8d3fe02
OS
1282 seq_printf(seq, ",subvolid=%llu",
1283 BTRFS_I(d_inode(dentry))->root->root_key.objectid);
1284 seq_puts(seq, ",subvol=");
1285 seq_dentry(seq, dentry, " \t\n\\");
a9572a15
EP
1286 return 0;
1287}
1288
a061fc8d 1289static int btrfs_test_super(struct super_block *s, void *data)
4b82d6e4 1290{
815745cf
AV
1291 struct btrfs_fs_info *p = data;
1292 struct btrfs_fs_info *fs_info = btrfs_sb(s);
4b82d6e4 1293
815745cf 1294 return fs_info->fs_devices == p->fs_devices;
4b82d6e4
Y
1295}
1296
450ba0ea
JB
1297static int btrfs_set_super(struct super_block *s, void *data)
1298{
6de1d09d
AV
1299 int err = set_anon_super(s, data);
1300 if (!err)
1301 s->s_fs_info = data;
1302 return err;
4b82d6e4
Y
1303}
1304
f9d9ef62
DS
1305/*
1306 * subvolumes are identified by ino 256
1307 */
1308static inline int is_subvolume_inode(struct inode *inode)
1309{
1310 if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
1311 return 1;
1312 return 0;
1313}
1314
830c4adb 1315/*
e6e4dbe8
OS
1316 * This will add subvolid=0 to the argument string while removing any subvol=
1317 * and subvolid= arguments to make sure we get the top-level root for path
1318 * walking to the subvol we want.
830c4adb
JB
1319 */
1320static char *setup_root_args(char *args)
1321{
e6e4dbe8 1322 char *buf, *dst, *sep;
830c4adb 1323
e6e4dbe8
OS
1324 if (!args)
1325 return kstrdup("subvolid=0", GFP_NOFS);
f60d16a8 1326
e6e4dbe8
OS
1327 /* The worst case is that we add ",subvolid=0" to the end. */
1328 buf = dst = kmalloc(strlen(args) + strlen(",subvolid=0") + 1, GFP_NOFS);
f60d16a8 1329 if (!buf)
830c4adb 1330 return NULL;
830c4adb 1331
e6e4dbe8
OS
1332 while (1) {
1333 sep = strchrnul(args, ',');
1334 if (!strstarts(args, "subvol=") &&
1335 !strstarts(args, "subvolid=")) {
1336 memcpy(dst, args, sep - args);
1337 dst += sep - args;
1338 *dst++ = ',';
1339 }
1340 if (*sep)
1341 args = sep + 1;
1342 else
1343 break;
830c4adb 1344 }
f60d16a8 1345 strcpy(dst, "subvolid=0");
830c4adb 1346
f60d16a8 1347 return buf;
830c4adb
JB
1348}
1349
bb289b7b
OS
1350static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid,
1351 int flags, const char *device_name,
1352 char *data)
830c4adb 1353{
830c4adb 1354 struct dentry *root;
fa330659 1355 struct vfsmount *mnt = NULL;
830c4adb 1356 char *newargs;
fa330659 1357 int ret;
830c4adb
JB
1358
1359 newargs = setup_root_args(data);
fa330659
OS
1360 if (!newargs) {
1361 root = ERR_PTR(-ENOMEM);
1362 goto out;
1363 }
0723a047 1364
fa330659
OS
1365 mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, newargs);
1366 if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) {
0723a047 1367 if (flags & MS_RDONLY) {
fa330659
OS
1368 mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY,
1369 device_name, newargs);
0723a047 1370 } else {
fa330659
OS
1371 mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY,
1372 device_name, newargs);
0040e606 1373 if (IS_ERR(mnt)) {
fa330659
OS
1374 root = ERR_CAST(mnt);
1375 mnt = NULL;
1376 goto out;
0040e606 1377 }
0723a047 1378
773cd04e 1379 down_write(&mnt->mnt_sb->s_umount);
fa330659 1380 ret = btrfs_remount(mnt->mnt_sb, &flags, NULL);
773cd04e 1381 up_write(&mnt->mnt_sb->s_umount);
fa330659
OS
1382 if (ret < 0) {
1383 root = ERR_PTR(ret);
1384 goto out;
0723a047
HH
1385 }
1386 }
1387 }
fa330659
OS
1388 if (IS_ERR(mnt)) {
1389 root = ERR_CAST(mnt);
1390 mnt = NULL;
1391 goto out;
1392 }
830c4adb 1393
05dbe683
OS
1394 if (!subvol_name) {
1395 if (!subvol_objectid) {
1396 ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb),
1397 &subvol_objectid);
1398 if (ret) {
1399 root = ERR_PTR(ret);
1400 goto out;
1401 }
1402 }
1403 subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb),
1404 subvol_objectid);
1405 if (IS_ERR(subvol_name)) {
1406 root = ERR_CAST(subvol_name);
1407 subvol_name = NULL;
1408 goto out;
1409 }
1410
1411 }
1412
ea441d11 1413 root = mount_subtree(mnt, subvol_name);
fa330659
OS
1414 /* mount_subtree() drops our reference on the vfsmount. */
1415 mnt = NULL;
830c4adb 1416
bb289b7b 1417 if (!IS_ERR(root)) {
ea441d11 1418 struct super_block *s = root->d_sb;
bb289b7b
OS
1419 struct inode *root_inode = d_inode(root);
1420 u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid;
1421
1422 ret = 0;
1423 if (!is_subvolume_inode(root_inode)) {
1424 pr_err("BTRFS: '%s' is not a valid subvolume\n",
1425 subvol_name);
1426 ret = -EINVAL;
1427 }
1428 if (subvol_objectid && root_objectid != subvol_objectid) {
05dbe683
OS
1429 /*
1430 * This will also catch a race condition where a
1431 * subvolume which was passed by ID is renamed and
1432 * another subvolume is renamed over the old location.
1433 */
bb289b7b
OS
1434 pr_err("BTRFS: subvol '%s' does not match subvolid %llu\n",
1435 subvol_name, subvol_objectid);
1436 ret = -EINVAL;
1437 }
1438 if (ret) {
1439 dput(root);
1440 root = ERR_PTR(ret);
1441 deactivate_locked_super(s);
1442 }
f9d9ef62
DS
1443 }
1444
fa330659
OS
1445out:
1446 mntput(mnt);
1447 kfree(newargs);
1448 kfree(subvol_name);
830c4adb
JB
1449 return root;
1450}
450ba0ea 1451
f667aef6
QW
1452static int parse_security_options(char *orig_opts,
1453 struct security_mnt_opts *sec_opts)
1454{
1455 char *secdata = NULL;
1456 int ret = 0;
1457
1458 secdata = alloc_secdata();
1459 if (!secdata)
1460 return -ENOMEM;
1461 ret = security_sb_copy_data(orig_opts, secdata);
1462 if (ret) {
1463 free_secdata(secdata);
1464 return ret;
1465 }
1466 ret = security_sb_parse_opts_str(secdata, sec_opts);
1467 free_secdata(secdata);
1468 return ret;
1469}
1470
1471static int setup_security_options(struct btrfs_fs_info *fs_info,
1472 struct super_block *sb,
1473 struct security_mnt_opts *sec_opts)
1474{
1475 int ret = 0;
1476
1477 /*
1478 * Call security_sb_set_mnt_opts() to check whether new sec_opts
1479 * is valid.
1480 */
1481 ret = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL);
1482 if (ret)
1483 return ret;
1484
a43bb39b 1485#ifdef CONFIG_SECURITY
f667aef6
QW
1486 if (!fs_info->security_opts.num_mnt_opts) {
1487 /* first time security setup, copy sec_opts to fs_info */
1488 memcpy(&fs_info->security_opts, sec_opts, sizeof(*sec_opts));
1489 } else {
1490 /*
1491 * Since SELinux(the only one supports security_mnt_opts) does
1492 * NOT support changing context during remount/mount same sb,
1493 * This must be the same or part of the same security options,
1494 * just free it.
1495 */
1496 security_free_mnt_opts(sec_opts);
1497 }
a43bb39b 1498#endif
f667aef6
QW
1499 return ret;
1500}
1501
edf24abe
CH
1502/*
1503 * Find a superblock for the given device / mount point.
1504 *
1505 * Note: This is based on get_sb_bdev from fs/super.c with a few additions
1506 * for multiple device setup. Make sure to keep it in sync.
1507 */
061dbc6b 1508static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
306e16ce 1509 const char *device_name, void *data)
4b82d6e4
Y
1510{
1511 struct block_device *bdev = NULL;
1512 struct super_block *s;
8a4b83cc 1513 struct btrfs_fs_devices *fs_devices = NULL;
450ba0ea 1514 struct btrfs_fs_info *fs_info = NULL;
f667aef6 1515 struct security_mnt_opts new_sec_opts;
97288f2c 1516 fmode_t mode = FMODE_READ;
73f73415
JB
1517 char *subvol_name = NULL;
1518 u64 subvol_objectid = 0;
4b82d6e4
Y
1519 int error = 0;
1520
97288f2c
CH
1521 if (!(flags & MS_RDONLY))
1522 mode |= FMODE_WRITE;
1523
1524 error = btrfs_parse_early_options(data, mode, fs_type,
73f73415 1525 &subvol_name, &subvol_objectid,
5e2a4b25 1526 &fs_devices);
f23c8af8
ID
1527 if (error) {
1528 kfree(subvol_name);
061dbc6b 1529 return ERR_PTR(error);
f23c8af8 1530 }
edf24abe 1531
05dbe683 1532 if (subvol_name || subvol_objectid != BTRFS_FS_TREE_OBJECTID) {
fa330659 1533 /* mount_subvol() will free subvol_name. */
bb289b7b
OS
1534 return mount_subvol(subvol_name, subvol_objectid, flags,
1535 device_name, data);
830c4adb
JB
1536 }
1537
f667aef6
QW
1538 security_init_mnt_opts(&new_sec_opts);
1539 if (data) {
1540 error = parse_security_options(data, &new_sec_opts);
1541 if (error)
1542 return ERR_PTR(error);
1543 }
1544
306e16ce 1545 error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices);
8a4b83cc 1546 if (error)
f667aef6 1547 goto error_sec_opts;
4b82d6e4 1548
450ba0ea
JB
1549 /*
1550 * Setup a dummy root and fs_info for test/set super. This is because
1551 * we don't actually fill this stuff out until open_ctree, but we need
1552 * it for searching for existing supers, so this lets us do that and
1553 * then open_ctree will properly initialize everything later.
1554 */
1555 fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS);
f667aef6
QW
1556 if (!fs_info) {
1557 error = -ENOMEM;
1558 goto error_sec_opts;
1559 }
04d21a24 1560
450ba0ea 1561 fs_info->fs_devices = fs_devices;
450ba0ea 1562
6c41761f
DS
1563 fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS);
1564 fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS);
f667aef6 1565 security_init_mnt_opts(&fs_info->security_opts);
6c41761f
DS
1566 if (!fs_info->super_copy || !fs_info->super_for_commit) {
1567 error = -ENOMEM;
04d21a24
ID
1568 goto error_fs_info;
1569 }
1570
1571 error = btrfs_open_devices(fs_devices, mode, fs_type);
1572 if (error)
1573 goto error_fs_info;
1574
1575 if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) {
1576 error = -EACCES;
6c41761f
DS
1577 goto error_close_devices;
1578 }
1579
dfe25020 1580 bdev = fs_devices->latest_bdev;
9249e17f
DH
1581 s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC,
1582 fs_info);
830c4adb
JB
1583 if (IS_ERR(s)) {
1584 error = PTR_ERR(s);
1585 goto error_close_devices;
1586 }
4b82d6e4
Y
1587
1588 if (s->s_root) {
2b82032c 1589 btrfs_close_devices(fs_devices);
6c41761f 1590 free_fs_info(fs_info);
59553edf
AV
1591 if ((flags ^ s->s_flags) & MS_RDONLY)
1592 error = -EBUSY;
4b82d6e4 1593 } else {
a1c6f057 1594 snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev);
815745cf 1595 btrfs_sb(s)->bdev_holder = fs_type;
8a4b83cc
CM
1596 error = btrfs_fill_super(s, fs_devices, data,
1597 flags & MS_SILENT ? 1 : 0);
4b82d6e4 1598 }
05dbe683 1599 if (error) {
f667aef6 1600 deactivate_locked_super(s);
f667aef6
QW
1601 goto error_sec_opts;
1602 }
1603
1604 fs_info = btrfs_sb(s);
1605 error = setup_security_options(fs_info, s, &new_sec_opts);
1606 if (error) {
830c4adb 1607 deactivate_locked_super(s);
f667aef6
QW
1608 goto error_sec_opts;
1609 }
4b82d6e4 1610
05dbe683 1611 return dget(s->s_root);
4b82d6e4 1612
c146afad 1613error_close_devices:
8a4b83cc 1614 btrfs_close_devices(fs_devices);
04d21a24 1615error_fs_info:
6c41761f 1616 free_fs_info(fs_info);
f667aef6
QW
1617error_sec_opts:
1618 security_free_mnt_opts(&new_sec_opts);
061dbc6b 1619 return ERR_PTR(error);
4b82d6e4 1620}
2e635a27 1621
0d2450ab
ST
1622static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info,
1623 int new_pool_size, int old_pool_size)
1624{
1625 if (new_pool_size == old_pool_size)
1626 return;
1627
1628 fs_info->thread_pool_size = new_pool_size;
1629
efe120a0 1630 btrfs_info(fs_info, "resize thread pool %d -> %d",
0d2450ab
ST
1631 old_pool_size, new_pool_size);
1632
5cdc7ad3 1633 btrfs_workqueue_set_max(fs_info->workers, new_pool_size);
afe3d242 1634 btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size);
a8c93d4e 1635 btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size);
e66f0bb1 1636 btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size);
fccb5d86
QW
1637 btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size);
1638 btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size);
1639 btrfs_workqueue_set_max(fs_info->endio_meta_write_workers,
1640 new_pool_size);
1641 btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size);
1642 btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size);
5b3bc44e 1643 btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size);
736cfa15 1644 btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size);
0339ef2f
QW
1645 btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers,
1646 new_pool_size);
0d2450ab
ST
1647}
1648
f42a34b2 1649static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info)
dc81cdc5
MX
1650{
1651 set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
f42a34b2 1652}
dc81cdc5 1653
f42a34b2
MX
1654static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info,
1655 unsigned long old_opts, int flags)
1656{
dc81cdc5
MX
1657 if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) &&
1658 (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) ||
1659 (flags & MS_RDONLY))) {
1660 /* wait for any defraggers to finish */
1661 wait_event(fs_info->transaction_wait,
1662 (atomic_read(&fs_info->defrag_running) == 0));
1663 if (flags & MS_RDONLY)
1664 sync_filesystem(fs_info->sb);
1665 }
1666}
1667
1668static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info,
1669 unsigned long old_opts)
1670{
1671 /*
1672 * We need cleanup all defragable inodes if the autodefragment is
1673 * close or the fs is R/O.
1674 */
1675 if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) &&
1676 (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) ||
1677 (fs_info->sb->s_flags & MS_RDONLY))) {
1678 btrfs_cleanup_defrag_inodes(fs_info);
1679 }
1680
1681 clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state);
1682}
1683
c146afad
YZ
1684static int btrfs_remount(struct super_block *sb, int *flags, char *data)
1685{
815745cf
AV
1686 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
1687 struct btrfs_root *root = fs_info->tree_root;
49b25e05
JM
1688 unsigned old_flags = sb->s_flags;
1689 unsigned long old_opts = fs_info->mount_opt;
1690 unsigned long old_compress_type = fs_info->compress_type;
1691 u64 old_max_inline = fs_info->max_inline;
1692 u64 old_alloc_start = fs_info->alloc_start;
1693 int old_thread_pool_size = fs_info->thread_pool_size;
1694 unsigned int old_metadata_ratio = fs_info->metadata_ratio;
c146afad
YZ
1695 int ret;
1696
02b9984d 1697 sync_filesystem(sb);
f42a34b2 1698 btrfs_remount_prepare(fs_info);
dc81cdc5 1699
f667aef6
QW
1700 if (data) {
1701 struct security_mnt_opts new_sec_opts;
1702
1703 security_init_mnt_opts(&new_sec_opts);
1704 ret = parse_security_options(data, &new_sec_opts);
1705 if (ret)
1706 goto restore;
1707 ret = setup_security_options(fs_info, sb,
1708 &new_sec_opts);
1709 if (ret) {
1710 security_free_mnt_opts(&new_sec_opts);
1711 goto restore;
1712 }
1713 }
1714
96da0919 1715 ret = btrfs_parse_options(root, data, *flags);
49b25e05
JM
1716 if (ret) {
1717 ret = -EINVAL;
1718 goto restore;
1719 }
b288052e 1720
f42a34b2 1721 btrfs_remount_begin(fs_info, old_opts, *flags);
0d2450ab
ST
1722 btrfs_resize_thread_pool(fs_info,
1723 fs_info->thread_pool_size, old_thread_pool_size);
1724
c146afad 1725 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
dc81cdc5 1726 goto out;
c146afad
YZ
1727
1728 if (*flags & MS_RDONLY) {
8dabb742
SB
1729 /*
1730 * this also happens on 'umount -rf' or on shutdown, when
1731 * the filesystem is busy.
1732 */
21c7e756 1733 cancel_work_sync(&fs_info->async_reclaim_work);
361c093d
SB
1734
1735 /* wait for the uuid_scan task to finish */
1736 down(&fs_info->uuid_tree_rescan_sem);
1737 /* avoid complains from lockdep et al. */
1738 up(&fs_info->uuid_tree_rescan_sem);
1739
c146afad
YZ
1740 sb->s_flags |= MS_RDONLY;
1741
e44163e1
JM
1742 /*
1743 * Setting MS_RDONLY will put the cleaner thread to
1744 * sleep at the next loop if it's already active.
1745 * If it's already asleep, we'll leave unused block
1746 * groups on disk until we're mounted read-write again
1747 * unless we clean them up here.
1748 */
e44163e1 1749 btrfs_delete_unused_bgs(fs_info);
e44163e1 1750
8dabb742
SB
1751 btrfs_dev_replace_suspend_for_unmount(fs_info);
1752 btrfs_scrub_cancel(fs_info);
061594ef 1753 btrfs_pause_balance(fs_info);
8dabb742 1754
49b25e05
JM
1755 ret = btrfs_commit_super(root);
1756 if (ret)
1757 goto restore;
c146afad 1758 } else {
6ef3de9c
DS
1759 if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) {
1760 btrfs_err(fs_info,
efe120a0 1761 "Remounting read-write after error is not allowed");
6ef3de9c
DS
1762 ret = -EINVAL;
1763 goto restore;
1764 }
8a3db184 1765 if (fs_info->fs_devices->rw_devices == 0) {
49b25e05
JM
1766 ret = -EACCES;
1767 goto restore;
8a3db184 1768 }
2b82032c 1769
292fd7fc
SB
1770 if (fs_info->fs_devices->missing_devices >
1771 fs_info->num_tolerated_disk_barrier_failures &&
1772 !(*flags & MS_RDONLY)) {
efe120a0
FH
1773 btrfs_warn(fs_info,
1774 "too many missing devices, writeable remount is not allowed");
292fd7fc
SB
1775 ret = -EACCES;
1776 goto restore;
1777 }
1778
8a3db184 1779 if (btrfs_super_log_root(fs_info->super_copy) != 0) {
49b25e05
JM
1780 ret = -EINVAL;
1781 goto restore;
8a3db184 1782 }
c146afad 1783
815745cf 1784 ret = btrfs_cleanup_fs_roots(fs_info);
49b25e05
JM
1785 if (ret)
1786 goto restore;
c146afad 1787
d68fc57b 1788 /* recover relocation */
5f316481 1789 mutex_lock(&fs_info->cleaner_mutex);
d68fc57b 1790 ret = btrfs_recover_relocation(root);
5f316481 1791 mutex_unlock(&fs_info->cleaner_mutex);
49b25e05
JM
1792 if (ret)
1793 goto restore;
c146afad 1794
2b6ba629
ID
1795 ret = btrfs_resume_balance_async(fs_info);
1796 if (ret)
1797 goto restore;
1798
8dabb742
SB
1799 ret = btrfs_resume_dev_replace_async(fs_info);
1800 if (ret) {
efe120a0 1801 btrfs_warn(fs_info, "failed to resume dev_replace");
8dabb742
SB
1802 goto restore;
1803 }
94aebfb2
JB
1804
1805 if (!fs_info->uuid_root) {
efe120a0 1806 btrfs_info(fs_info, "creating UUID tree");
94aebfb2
JB
1807 ret = btrfs_create_uuid_tree(fs_info);
1808 if (ret) {
efe120a0 1809 btrfs_warn(fs_info, "failed to create the UUID tree %d", ret);
94aebfb2
JB
1810 goto restore;
1811 }
1812 }
c146afad
YZ
1813 sb->s_flags &= ~MS_RDONLY;
1814 }
dc81cdc5 1815out:
2c6a92b0 1816 wake_up_process(fs_info->transaction_kthread);
dc81cdc5 1817 btrfs_remount_cleanup(fs_info, old_opts);
c146afad 1818 return 0;
49b25e05
JM
1819
1820restore:
1821 /* We've hit an error - don't reset MS_RDONLY */
1822 if (sb->s_flags & MS_RDONLY)
1823 old_flags |= MS_RDONLY;
1824 sb->s_flags = old_flags;
1825 fs_info->mount_opt = old_opts;
1826 fs_info->compress_type = old_compress_type;
1827 fs_info->max_inline = old_max_inline;
c018daec 1828 mutex_lock(&fs_info->chunk_mutex);
49b25e05 1829 fs_info->alloc_start = old_alloc_start;
c018daec 1830 mutex_unlock(&fs_info->chunk_mutex);
0d2450ab
ST
1831 btrfs_resize_thread_pool(fs_info,
1832 old_thread_pool_size, fs_info->thread_pool_size);
49b25e05 1833 fs_info->metadata_ratio = old_metadata_ratio;
dc81cdc5 1834 btrfs_remount_cleanup(fs_info, old_opts);
49b25e05 1835 return ret;
c146afad
YZ
1836}
1837
bcd53741
AJ
1838/* Used to sort the devices by max_avail(descending sort) */
1839static int btrfs_cmp_device_free_bytes(const void *dev_info1,
1840 const void *dev_info2)
1841{
1842 if (((struct btrfs_device_info *)dev_info1)->max_avail >
1843 ((struct btrfs_device_info *)dev_info2)->max_avail)
1844 return -1;
1845 else if (((struct btrfs_device_info *)dev_info1)->max_avail <
1846 ((struct btrfs_device_info *)dev_info2)->max_avail)
1847 return 1;
1848 else
1849 return 0;
1850}
1851
1852/*
1853 * sort the devices by max_avail, in which max free extent size of each device
1854 * is stored.(Descending Sort)
1855 */
1856static inline void btrfs_descending_sort_devices(
1857 struct btrfs_device_info *devices,
1858 size_t nr_devices)
1859{
1860 sort(devices, nr_devices, sizeof(struct btrfs_device_info),
1861 btrfs_cmp_device_free_bytes, NULL);
1862}
1863
6d07bcec
MX
1864/*
1865 * The helper to calc the free space on the devices that can be used to store
1866 * file data.
1867 */
1868static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes)
1869{
1870 struct btrfs_fs_info *fs_info = root->fs_info;
1871 struct btrfs_device_info *devices_info;
1872 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
1873 struct btrfs_device *device;
1874 u64 skip_space;
1875 u64 type;
1876 u64 avail_space;
1877 u64 used_space;
1878 u64 min_stripe_size;
39fb26c3 1879 int min_stripes = 1, num_stripes = 1;
6d07bcec
MX
1880 int i = 0, nr_devices;
1881 int ret;
1882
7e33fd99
JB
1883 /*
1884 * We aren't under the device list lock, so this is racey-ish, but good
1885 * enough for our purposes.
1886 */
b772a86e 1887 nr_devices = fs_info->fs_devices->open_devices;
7e33fd99
JB
1888 if (!nr_devices) {
1889 smp_mb();
1890 nr_devices = fs_info->fs_devices->open_devices;
1891 ASSERT(nr_devices);
1892 if (!nr_devices) {
1893 *free_bytes = 0;
1894 return 0;
1895 }
1896 }
6d07bcec 1897
d9b0d9ba 1898 devices_info = kmalloc_array(nr_devices, sizeof(*devices_info),
6d07bcec
MX
1899 GFP_NOFS);
1900 if (!devices_info)
1901 return -ENOMEM;
1902
1903 /* calc min stripe number for data space alloction */
1904 type = btrfs_get_alloc_profile(root, 1);
39fb26c3 1905 if (type & BTRFS_BLOCK_GROUP_RAID0) {
6d07bcec 1906 min_stripes = 2;
39fb26c3
MX
1907 num_stripes = nr_devices;
1908 } else if (type & BTRFS_BLOCK_GROUP_RAID1) {
6d07bcec 1909 min_stripes = 2;
39fb26c3
MX
1910 num_stripes = 2;
1911 } else if (type & BTRFS_BLOCK_GROUP_RAID10) {
6d07bcec 1912 min_stripes = 4;
39fb26c3
MX
1913 num_stripes = 4;
1914 }
6d07bcec
MX
1915
1916 if (type & BTRFS_BLOCK_GROUP_DUP)
1917 min_stripe_size = 2 * BTRFS_STRIPE_LEN;
1918 else
1919 min_stripe_size = BTRFS_STRIPE_LEN;
1920
7e33fd99
JB
1921 if (fs_info->alloc_start)
1922 mutex_lock(&fs_devices->device_list_mutex);
1923 rcu_read_lock();
1924 list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) {
63a212ab
SB
1925 if (!device->in_fs_metadata || !device->bdev ||
1926 device->is_tgtdev_for_dev_replace)
6d07bcec
MX
1927 continue;
1928
7e33fd99
JB
1929 if (i >= nr_devices)
1930 break;
1931
6d07bcec
MX
1932 avail_space = device->total_bytes - device->bytes_used;
1933
1934 /* align with stripe_len */
f8c269d7 1935 avail_space = div_u64(avail_space, BTRFS_STRIPE_LEN);
6d07bcec
MX
1936 avail_space *= BTRFS_STRIPE_LEN;
1937
1938 /*
1939 * In order to avoid overwritting the superblock on the drive,
1940 * btrfs starts at an offset of at least 1MB when doing chunk
1941 * allocation.
1942 */
ee22184b 1943 skip_space = SZ_1M;
6d07bcec
MX
1944
1945 /* user can set the offset in fs_info->alloc_start. */
7e33fd99
JB
1946 if (fs_info->alloc_start &&
1947 fs_info->alloc_start + BTRFS_STRIPE_LEN <=
1948 device->total_bytes) {
1949 rcu_read_unlock();
6d07bcec
MX
1950 skip_space = max(fs_info->alloc_start, skip_space);
1951
7e33fd99
JB
1952 /*
1953 * btrfs can not use the free space in
1954 * [0, skip_space - 1], we must subtract it from the
1955 * total. In order to implement it, we account the used
1956 * space in this range first.
1957 */
1958 ret = btrfs_account_dev_extents_size(device, 0,
1959 skip_space - 1,
1960 &used_space);
1961 if (ret) {
1962 kfree(devices_info);
1963 mutex_unlock(&fs_devices->device_list_mutex);
1964 return ret;
1965 }
1966
1967 rcu_read_lock();
6d07bcec 1968
7e33fd99
JB
1969 /* calc the free space in [0, skip_space - 1] */
1970 skip_space -= used_space;
1971 }
6d07bcec
MX
1972
1973 /*
1974 * we can use the free space in [0, skip_space - 1], subtract
1975 * it from the total.
1976 */
1977 if (avail_space && avail_space >= skip_space)
1978 avail_space -= skip_space;
1979 else
1980 avail_space = 0;
1981
1982 if (avail_space < min_stripe_size)
1983 continue;
1984
1985 devices_info[i].dev = device;
1986 devices_info[i].max_avail = avail_space;
1987
1988 i++;
1989 }
7e33fd99
JB
1990 rcu_read_unlock();
1991 if (fs_info->alloc_start)
1992 mutex_unlock(&fs_devices->device_list_mutex);
6d07bcec
MX
1993
1994 nr_devices = i;
1995
1996 btrfs_descending_sort_devices(devices_info, nr_devices);
1997
1998 i = nr_devices - 1;
1999 avail_space = 0;
2000 while (nr_devices >= min_stripes) {
39fb26c3
MX
2001 if (num_stripes > nr_devices)
2002 num_stripes = nr_devices;
2003
6d07bcec
MX
2004 if (devices_info[i].max_avail >= min_stripe_size) {
2005 int j;
2006 u64 alloc_size;
2007
39fb26c3 2008 avail_space += devices_info[i].max_avail * num_stripes;
6d07bcec 2009 alloc_size = devices_info[i].max_avail;
39fb26c3 2010 for (j = i + 1 - num_stripes; j <= i; j++)
6d07bcec
MX
2011 devices_info[j].max_avail -= alloc_size;
2012 }
2013 i--;
2014 nr_devices--;
2015 }
2016
2017 kfree(devices_info);
2018 *free_bytes = avail_space;
2019 return 0;
2020}
2021
ba7b6e62
DS
2022/*
2023 * Calculate numbers for 'df', pessimistic in case of mixed raid profiles.
2024 *
2025 * If there's a redundant raid level at DATA block groups, use the respective
2026 * multiplier to scale the sizes.
2027 *
2028 * Unused device space usage is based on simulating the chunk allocator
2029 * algorithm that respects the device sizes, order of allocations and the
2030 * 'alloc_start' value, this is a close approximation of the actual use but
2031 * there are other factors that may change the result (like a new metadata
2032 * chunk).
2033 *
ca8a51b3
DS
2034 * If metadata is exhausted, f_bavail will be 0.
2035 *
ba7b6e62
DS
2036 * FIXME: not accurate for mixed block groups, total and free/used are ok,
2037 * available appears slightly larger.
2038 */
8fd17795
CM
2039static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
2040{
815745cf
AV
2041 struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb);
2042 struct btrfs_super_block *disk_super = fs_info->super_copy;
2043 struct list_head *head = &fs_info->space_info;
bd4d1088
JB
2044 struct btrfs_space_info *found;
2045 u64 total_used = 0;
6d07bcec 2046 u64 total_free_data = 0;
ca8a51b3 2047 u64 total_free_meta = 0;
db94535d 2048 int bits = dentry->d_sb->s_blocksize_bits;
815745cf 2049 __be32 *fsid = (__be32 *)fs_info->fsid;
ba7b6e62
DS
2050 unsigned factor = 1;
2051 struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv;
6d07bcec 2052 int ret;
ca8a51b3 2053 u64 thresh = 0;
8fd17795 2054
15484377
MX
2055 /*
2056 * holding chunk_muext to avoid allocating new chunks, holding
2057 * device_list_mutex to avoid the device being removed
2058 */
bd4d1088 2059 rcu_read_lock();
89a55897 2060 list_for_each_entry_rcu(found, head, list) {
6d07bcec 2061 if (found->flags & BTRFS_BLOCK_GROUP_DATA) {
ba7b6e62
DS
2062 int i;
2063
6d07bcec
MX
2064 total_free_data += found->disk_total - found->disk_used;
2065 total_free_data -=
2066 btrfs_account_ro_block_groups_free_space(found);
ba7b6e62
DS
2067
2068 for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) {
2069 if (!list_empty(&found->block_groups[i])) {
2070 switch (i) {
2071 case BTRFS_RAID_DUP:
2072 case BTRFS_RAID_RAID1:
2073 case BTRFS_RAID_RAID10:
2074 factor = 2;
2075 }
2076 }
2077 }
6d07bcec 2078 }
ca8a51b3
DS
2079 if (found->flags & BTRFS_BLOCK_GROUP_METADATA)
2080 total_free_meta += found->disk_total - found->disk_used;
6d07bcec 2081
b742bb82 2082 total_used += found->disk_used;
89a55897 2083 }
ba7b6e62 2084
bd4d1088
JB
2085 rcu_read_unlock();
2086
ba7b6e62
DS
2087 buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor);
2088 buf->f_blocks >>= bits;
2089 buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits);
2090
2091 /* Account global block reserve as used, it's in logical size already */
2092 spin_lock(&block_rsv->lock);
2093 buf->f_bfree -= block_rsv->size >> bits;
2094 spin_unlock(&block_rsv->lock);
2095
0d95c1be 2096 buf->f_bavail = div_u64(total_free_data, factor);
815745cf 2097 ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data);
7e33fd99 2098 if (ret)
6d07bcec 2099 return ret;
ba7b6e62 2100 buf->f_bavail += div_u64(total_free_data, factor);
6d07bcec 2101 buf->f_bavail = buf->f_bavail >> bits;
d397712b 2102
ca8a51b3
DS
2103 /*
2104 * We calculate the remaining metadata space minus global reserve. If
2105 * this is (supposedly) smaller than zero, there's no space. But this
2106 * does not hold in practice, the exhausted state happens where's still
2107 * some positive delta. So we apply some guesswork and compare the
2108 * delta to a 4M threshold. (Practically observed delta was ~2M.)
2109 *
2110 * We probably cannot calculate the exact threshold value because this
2111 * depends on the internal reservations requested by various
2112 * operations, so some operations that consume a few metadata will
2113 * succeed even if the Avail is zero. But this is better than the other
2114 * way around.
2115 */
2116 thresh = 4 * 1024 * 1024;
2117
2118 if (total_free_meta - thresh < block_rsv->size)
2119 buf->f_bavail = 0;
2120
ba7b6e62
DS
2121 buf->f_type = BTRFS_SUPER_MAGIC;
2122 buf->f_bsize = dentry->d_sb->s_blocksize;
2123 buf->f_namelen = BTRFS_NAME_LEN;
2124
9d03632e 2125 /* We treat it as constant endianness (it doesn't matter _which_)
d397712b 2126 because we want the fsid to come out the same whether mounted
9d03632e
DW
2127 on a big-endian or little-endian host */
2128 buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]);
2129 buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]);
32d48fa1 2130 /* Mask in the root object ID too, to disambiguate subvols */
2b0143b5
DH
2131 buf->f_fsid.val[0] ^= BTRFS_I(d_inode(dentry))->root->objectid >> 32;
2132 buf->f_fsid.val[1] ^= BTRFS_I(d_inode(dentry))->root->objectid;
32d48fa1 2133
8fd17795
CM
2134 return 0;
2135}
b5133862 2136
aea52e19
AV
2137static void btrfs_kill_super(struct super_block *sb)
2138{
815745cf 2139 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
aea52e19 2140 kill_anon_super(sb);
d22ca7de 2141 free_fs_info(fs_info);
aea52e19
AV
2142}
2143
2e635a27
CM
2144static struct file_system_type btrfs_fs_type = {
2145 .owner = THIS_MODULE,
2146 .name = "btrfs",
061dbc6b 2147 .mount = btrfs_mount,
aea52e19 2148 .kill_sb = btrfs_kill_super,
f667aef6 2149 .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA,
2e635a27 2150};
7f78e035 2151MODULE_ALIAS_FS("btrfs");
a9218f6b 2152
d8620958
TVB
2153static int btrfs_control_open(struct inode *inode, struct file *file)
2154{
2155 /*
2156 * The control file's private_data is used to hold the
2157 * transaction when it is started and is used to keep
2158 * track of whether a transaction is already in progress.
2159 */
2160 file->private_data = NULL;
2161 return 0;
2162}
2163
d352ac68
CM
2164/*
2165 * used by btrfsctl to scan devices when no FS is mounted
2166 */
8a4b83cc
CM
2167static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
2168 unsigned long arg)
2169{
2170 struct btrfs_ioctl_vol_args *vol;
2171 struct btrfs_fs_devices *fs_devices;
c071fcfd 2172 int ret = -ENOTTY;
8a4b83cc 2173
e441d54d
CM
2174 if (!capable(CAP_SYS_ADMIN))
2175 return -EPERM;
2176
dae7b665
LZ
2177 vol = memdup_user((void __user *)arg, sizeof(*vol));
2178 if (IS_ERR(vol))
2179 return PTR_ERR(vol);
c071fcfd 2180
8a4b83cc
CM
2181 switch (cmd) {
2182 case BTRFS_IOC_SCAN_DEV:
97288f2c 2183 ret = btrfs_scan_one_device(vol->name, FMODE_READ,
8a4b83cc
CM
2184 &btrfs_fs_type, &fs_devices);
2185 break;
02db0844
JB
2186 case BTRFS_IOC_DEVICES_READY:
2187 ret = btrfs_scan_one_device(vol->name, FMODE_READ,
2188 &btrfs_fs_type, &fs_devices);
2189 if (ret)
2190 break;
2191 ret = !(fs_devices->num_devices == fs_devices->total_devices);
2192 break;
c5868f83 2193 case BTRFS_IOC_GET_SUPPORTED_FEATURES:
d5131b65 2194 ret = btrfs_ioctl_get_supported_features((void __user*)arg);
c5868f83 2195 break;
8a4b83cc 2196 }
dae7b665 2197
8a4b83cc 2198 kfree(vol);
f819d837 2199 return ret;
8a4b83cc
CM
2200}
2201
0176260f 2202static int btrfs_freeze(struct super_block *sb)
ed0dab6b 2203{
354aa0fb
MX
2204 struct btrfs_trans_handle *trans;
2205 struct btrfs_root *root = btrfs_sb(sb)->tree_root;
2206
d4edf39b 2207 trans = btrfs_attach_transaction_barrier(root);
354aa0fb
MX
2208 if (IS_ERR(trans)) {
2209 /* no transaction, don't bother */
2210 if (PTR_ERR(trans) == -ENOENT)
2211 return 0;
2212 return PTR_ERR(trans);
2213 }
2214 return btrfs_commit_transaction(trans, root);
ed0dab6b
Y
2215}
2216
9c5085c1
JB
2217static int btrfs_show_devname(struct seq_file *m, struct dentry *root)
2218{
2219 struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb);
2220 struct btrfs_fs_devices *cur_devices;
2221 struct btrfs_device *dev, *first_dev = NULL;
2222 struct list_head *head;
2223 struct rcu_string *name;
2224
2225 mutex_lock(&fs_info->fs_devices->device_list_mutex);
2226 cur_devices = fs_info->fs_devices;
2227 while (cur_devices) {
2228 head = &cur_devices->devices;
2229 list_for_each_entry(dev, head, dev_list) {
aa9ddcd4
JB
2230 if (dev->missing)
2231 continue;
0aeb8a6e
AJ
2232 if (!dev->name)
2233 continue;
9c5085c1
JB
2234 if (!first_dev || dev->devid < first_dev->devid)
2235 first_dev = dev;
2236 }
2237 cur_devices = cur_devices->seed;
2238 }
2239
2240 if (first_dev) {
2241 rcu_read_lock();
2242 name = rcu_dereference(first_dev->name);
2243 seq_escape(m, name->str, " \t\n\\");
2244 rcu_read_unlock();
2245 } else {
2246 WARN_ON(1);
2247 }
2248 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
2249 return 0;
2250}
2251
b87221de 2252static const struct super_operations btrfs_super_ops = {
76dda93c 2253 .drop_inode = btrfs_drop_inode,
bd555975 2254 .evict_inode = btrfs_evict_inode,
e20d96d6 2255 .put_super = btrfs_put_super,
d5719762 2256 .sync_fs = btrfs_sync_fs,
a9572a15 2257 .show_options = btrfs_show_options,
9c5085c1 2258 .show_devname = btrfs_show_devname,
4730a4bc 2259 .write_inode = btrfs_write_inode,
2c90e5d6
CM
2260 .alloc_inode = btrfs_alloc_inode,
2261 .destroy_inode = btrfs_destroy_inode,
8fd17795 2262 .statfs = btrfs_statfs,
c146afad 2263 .remount_fs = btrfs_remount,
0176260f 2264 .freeze_fs = btrfs_freeze,
e20d96d6 2265};
a9218f6b
CM
2266
2267static const struct file_operations btrfs_ctl_fops = {
d8620958 2268 .open = btrfs_control_open,
a9218f6b
CM
2269 .unlocked_ioctl = btrfs_control_ioctl,
2270 .compat_ioctl = btrfs_control_ioctl,
2271 .owner = THIS_MODULE,
6038f373 2272 .llseek = noop_llseek,
a9218f6b
CM
2273};
2274
2275static struct miscdevice btrfs_misc = {
578454ff 2276 .minor = BTRFS_MINOR,
a9218f6b
CM
2277 .name = "btrfs-control",
2278 .fops = &btrfs_ctl_fops
2279};
2280
578454ff
KS
2281MODULE_ALIAS_MISCDEV(BTRFS_MINOR);
2282MODULE_ALIAS("devname:btrfs-control");
2283
a9218f6b
CM
2284static int btrfs_interface_init(void)
2285{
2286 return misc_register(&btrfs_misc);
2287}
2288
b2950863 2289static void btrfs_interface_exit(void)
a9218f6b 2290{
f368ed60 2291 misc_deregister(&btrfs_misc);
a9218f6b
CM
2292}
2293
8ae1af3c 2294static void btrfs_print_mod_info(void)
85965600
DS
2295{
2296 printk(KERN_INFO "Btrfs loaded"
2297#ifdef CONFIG_BTRFS_DEBUG
2298 ", debug=on"
2299#endif
79556c3d
SB
2300#ifdef CONFIG_BTRFS_ASSERT
2301 ", assert=on"
2302#endif
85965600
DS
2303#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
2304 ", integrity-checker=on"
2305#endif
2306 "\n");
2307}
2308
dc11dd5d
JB
2309static int btrfs_run_sanity_tests(void)
2310{
06ea65a3
JB
2311 int ret;
2312
294e30fe 2313 ret = btrfs_init_test_fs();
06ea65a3
JB
2314 if (ret)
2315 return ret;
294e30fe
JB
2316
2317 ret = btrfs_test_free_space_cache();
2318 if (ret)
2319 goto out;
2320 ret = btrfs_test_extent_buffer_operations();
2321 if (ret)
2322 goto out;
2323 ret = btrfs_test_extent_io();
aaedb55b
JB
2324 if (ret)
2325 goto out;
2326 ret = btrfs_test_inodes();
faa2dbf0
JB
2327 if (ret)
2328 goto out;
2329 ret = btrfs_test_qgroups();
7c55ee0c
OS
2330 if (ret)
2331 goto out;
2332 ret = btrfs_test_free_space_tree();
294e30fe
JB
2333out:
2334 btrfs_destroy_test_fs();
2335 return ret;
dc11dd5d
JB
2336}
2337
2e635a27
CM
2338static int __init init_btrfs_fs(void)
2339{
2c90e5d6 2340 int err;
58176a96 2341
14a958e6
FDBM
2342 err = btrfs_hash_init();
2343 if (err)
2344 return err;
2345
63541927
FDBM
2346 btrfs_props_init();
2347
58176a96
JB
2348 err = btrfs_init_sysfs();
2349 if (err)
14a958e6 2350 goto free_hash;
58176a96 2351
143bede5 2352 btrfs_init_compress();
d1310b2e 2353
261507a0
LZ
2354 err = btrfs_init_cachep();
2355 if (err)
2356 goto free_compress;
2357
d1310b2e 2358 err = extent_io_init();
2f4cbe64
WB
2359 if (err)
2360 goto free_cachep;
2361
d1310b2e
CM
2362 err = extent_map_init();
2363 if (err)
2364 goto free_extent_io;
2365
6352b91d 2366 err = ordered_data_init();
2f4cbe64
WB
2367 if (err)
2368 goto free_extent_map;
c8b97818 2369
6352b91d
MX
2370 err = btrfs_delayed_inode_init();
2371 if (err)
2372 goto free_ordered_data;
2373
9247f317 2374 err = btrfs_auto_defrag_init();
16cdcec7
MX
2375 if (err)
2376 goto free_delayed_inode;
2377
78a6184a 2378 err = btrfs_delayed_ref_init();
9247f317
MX
2379 if (err)
2380 goto free_auto_defrag;
2381
b9e9a6cb
WS
2382 err = btrfs_prelim_ref_init();
2383 if (err)
af13b492 2384 goto free_delayed_ref;
b9e9a6cb 2385
97eb6b69 2386 err = btrfs_end_io_wq_init();
78a6184a 2387 if (err)
af13b492 2388 goto free_prelim_ref;
78a6184a 2389
97eb6b69
DS
2390 err = btrfs_interface_init();
2391 if (err)
2392 goto free_end_io_wq;
2393
e565d4b9
JS
2394 btrfs_init_lockdep();
2395
8ae1af3c 2396 btrfs_print_mod_info();
dc11dd5d
JB
2397
2398 err = btrfs_run_sanity_tests();
2399 if (err)
2400 goto unregister_ioctl;
2401
2402 err = register_filesystem(&btrfs_fs_type);
2403 if (err)
2404 goto unregister_ioctl;
74255aa0 2405
2f4cbe64
WB
2406 return 0;
2407
a9218f6b
CM
2408unregister_ioctl:
2409 btrfs_interface_exit();
97eb6b69
DS
2410free_end_io_wq:
2411 btrfs_end_io_wq_exit();
b9e9a6cb
WS
2412free_prelim_ref:
2413 btrfs_prelim_ref_exit();
78a6184a
MX
2414free_delayed_ref:
2415 btrfs_delayed_ref_exit();
9247f317
MX
2416free_auto_defrag:
2417 btrfs_auto_defrag_exit();
16cdcec7
MX
2418free_delayed_inode:
2419 btrfs_delayed_inode_exit();
6352b91d
MX
2420free_ordered_data:
2421 ordered_data_exit();
2f4cbe64
WB
2422free_extent_map:
2423 extent_map_exit();
d1310b2e
CM
2424free_extent_io:
2425 extent_io_exit();
2f4cbe64
WB
2426free_cachep:
2427 btrfs_destroy_cachep();
261507a0
LZ
2428free_compress:
2429 btrfs_exit_compress();
2f4cbe64 2430 btrfs_exit_sysfs();
14a958e6
FDBM
2431free_hash:
2432 btrfs_hash_exit();
2f4cbe64 2433 return err;
2e635a27
CM
2434}
2435
2436static void __exit exit_btrfs_fs(void)
2437{
39279cc3 2438 btrfs_destroy_cachep();
78a6184a 2439 btrfs_delayed_ref_exit();
9247f317 2440 btrfs_auto_defrag_exit();
16cdcec7 2441 btrfs_delayed_inode_exit();
b9e9a6cb 2442 btrfs_prelim_ref_exit();
6352b91d 2443 ordered_data_exit();
a52d9a80 2444 extent_map_exit();
d1310b2e 2445 extent_io_exit();
a9218f6b 2446 btrfs_interface_exit();
5ed5f588 2447 btrfs_end_io_wq_exit();
2e635a27 2448 unregister_filesystem(&btrfs_fs_type);
58176a96 2449 btrfs_exit_sysfs();
8a4b83cc 2450 btrfs_cleanup_fs_uuids();
261507a0 2451 btrfs_exit_compress();
14a958e6 2452 btrfs_hash_exit();
2e635a27
CM
2453}
2454
60efa5eb 2455late_initcall(init_btrfs_fs);
2e635a27
CM
2456module_exit(exit_btrfs_fs)
2457
2458MODULE_LICENSE("GPL");