blob: 3559d0b3518ab91fed3ab190e241ff8c51393cc4 [file] [log] [blame]
Chris Mason6cbd5572007-06-12 09:07:21 -04001/*
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
Yan4b82d6e2007-08-29 09:11:44 -040019#include <linux/blkdev.h>
Chris Mason2e635a22007-03-21 11:12:56 -040020#include <linux/module.h>
Chris Masone20d96d2007-03-22 12:13:20 -040021#include <linux/buffer_head.h>
Chris Mason2e635a22007-03-21 11:12:56 -040022#include <linux/fs.h>
23#include <linux/pagemap.h>
24#include <linux/highmem.h>
25#include <linux/time.h>
26#include <linux/init.h>
Eric Parisa9572a12009-04-02 16:46:06 -040027#include <linux/seq_file.h>
Chris Mason2e635a22007-03-21 11:12:56 -040028#include <linux/string.h>
Chris Mason2e635a22007-03-21 11:12:56 -040029#include <linux/backing-dev.h>
Yan4b82d6e2007-08-29 09:11:44 -040030#include <linux/mount.h>
Chris Masondee26a92007-03-26 16:00:06 -040031#include <linux/mpage.h>
Chris Mason75dfe392007-03-29 11:56:46 -040032#include <linux/swap.h>
33#include <linux/writeback.h>
Chris Mason8fd17792007-04-19 21:01:03 -040034#include <linux/statfs.h>
Chris Mason08607c12007-06-08 15:33:54 -040035#include <linux/compat.h>
Chris Mason95e05282007-08-29 09:11:44 -040036#include <linux/parser.h>
Chris Masonc59f8952007-12-17 20:14:04 -050037#include <linux/ctype.h>
Chris Mason6da6aba2007-12-18 16:15:09 -050038#include <linux/namei.h>
Chris Masona9218f62008-03-24 15:02:04 -040039#include <linux/miscdevice.h>
Qinghuang Feng1bcbf312009-01-15 13:51:03 -080040#include <linux/magic.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090041#include <linux/slab.h>
Chris Mason4b4e25f2008-11-20 10:22:27 -050042#include "compat.h"
Miao Xie16cdcec2011-04-22 18:12:22 +080043#include "delayed-inode.h"
Chris Mason2e635a22007-03-21 11:12:56 -040044#include "ctree.h"
Chris Masone20d96d2007-03-22 12:13:20 -040045#include "disk-io.h"
Chris Masond5719762007-03-23 10:01:08 -040046#include "transaction.h"
Chris Mason2c90e5d2007-04-02 10:50:19 -040047#include "btrfs_inode.h"
Chris Masonc5739bb2007-04-10 09:27:04 -040048#include "ioctl.h"
Chris Mason3a686372007-05-24 13:35:57 -040049#include "print-tree.h"
Josef Bacik5103e942007-11-16 11:45:54 -050050#include "xattr.h"
Chris Mason8a4b83c2008-03-24 15:02:07 -040051#include "volumes.h"
Chris Masonb3c3da72008-07-23 12:12:13 -040052#include "version.h"
Balaji Raobe6e8dc2008-07-21 02:01:56 +053053#include "export.h"
Chris Masonc8b97812008-10-29 14:49:59 -040054#include "compression.h"
Chris Mason2e635a22007-03-21 11:12:56 -040055
liubo1abe9b82011-03-24 11:18:59 +000056#define CREATE_TRACE_POINTS
57#include <trace/events/btrfs.h>
58
Alexey Dobriyanb87221d2009-09-21 17:01:09 -070059static const struct super_operations btrfs_super_ops;
Chris Masone20d96d2007-03-22 12:13:20 -040060
liuboacce9522011-01-06 19:30:25 +080061static const char *btrfs_decode_error(struct btrfs_fs_info *fs_info, int errno,
62 char nbuf[16])
63{
64 char *errstr = NULL;
65
66 switch (errno) {
67 case -EIO:
68 errstr = "IO failure";
69 break;
70 case -ENOMEM:
71 errstr = "Out of memory";
72 break;
73 case -EROFS:
74 errstr = "Readonly filesystem";
75 break;
76 default:
77 if (nbuf) {
78 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
79 errstr = nbuf;
80 }
81 break;
82 }
83
84 return errstr;
85}
86
87static void __save_error_info(struct btrfs_fs_info *fs_info)
88{
89 /*
90 * today we only save the error info into ram. Long term we'll
91 * also send it down to the disk
92 */
93 fs_info->fs_state = BTRFS_SUPER_FLAG_ERROR;
94}
95
96/* NOTE:
97 * We move write_super stuff at umount in order to avoid deadlock
98 * for umount hold all lock.
99 */
100static void save_error_info(struct btrfs_fs_info *fs_info)
101{
102 __save_error_info(fs_info);
103}
104
105/* btrfs handle error by forcing the filesystem readonly */
106static void btrfs_handle_error(struct btrfs_fs_info *fs_info)
107{
108 struct super_block *sb = fs_info->sb;
109
110 if (sb->s_flags & MS_RDONLY)
111 return;
112
113 if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) {
114 sb->s_flags |= MS_RDONLY;
115 printk(KERN_INFO "btrfs is forced readonly\n");
116 }
117}
118
119/*
120 * __btrfs_std_error decodes expected errors from the caller and
121 * invokes the approciate error response.
122 */
123void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
124 unsigned int line, int errno)
125{
126 struct super_block *sb = fs_info->sb;
127 char nbuf[16];
128 const char *errstr;
129
130 /*
131 * Special case: if the error is EROFS, and we're already
132 * under MS_RDONLY, then it is safe here.
133 */
134 if (errno == -EROFS && (sb->s_flags & MS_RDONLY))
135 return;
136
137 errstr = btrfs_decode_error(fs_info, errno, nbuf);
138 printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: %s\n",
139 sb->s_id, function, line, errstr);
140 save_error_info(fs_info);
141
142 btrfs_handle_error(fs_info);
143}
144
Chris Masond3977122009-01-05 21:25:51 -0500145static void btrfs_put_super(struct super_block *sb)
Chris Masone20d96d2007-03-22 12:13:20 -0400146{
147 struct btrfs_root *root = btrfs_sb(sb);
148 int ret;
149
150 ret = close_ctree(root);
Chris Masone20d96d2007-03-22 12:13:20 -0400151 sb->s_fs_info = NULL;
Andi Kleen559af822010-10-29 15:14:37 -0400152
153 (void)ret; /* FIXME: need to fix VFS to return error? */
Chris Masone20d96d2007-03-22 12:13:20 -0400154}
Chris Mason2e635a22007-03-21 11:12:56 -0400155
Chris Mason95e05282007-08-29 09:11:44 -0400156enum {
Josef Bacik73f73412009-12-04 17:38:27 +0000157 Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum,
Josef Bacik287a0ab2010-03-19 18:07:23 +0000158 Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd,
159 Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress,
Li Zefan261507a02010-12-17 14:21:50 +0800160 Opt_compress_type, Opt_compress_force, Opt_compress_force_type,
161 Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard,
Chris Mason91435652011-02-16 13:10:41 -0500162 Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed,
Chris Mason4b9465c2011-06-03 09:36:29 -0400163 Opt_enospc_debug, Opt_subvolrootid, Opt_defrag,
164 Opt_inode_cache, Opt_err,
Chris Mason95e05282007-08-29 09:11:44 -0400165};
166
167static match_table_t tokens = {
Chris Masondfe25022008-05-13 13:46:40 -0400168 {Opt_degraded, "degraded"},
Chris Mason95e05282007-08-29 09:11:44 -0400169 {Opt_subvol, "subvol=%s"},
Josef Bacik73f73412009-12-04 17:38:27 +0000170 {Opt_subvolid, "subvolid=%d"},
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400171 {Opt_device, "device=%s"},
Chris Masonb6cda9b2007-12-14 15:30:32 -0500172 {Opt_nodatasum, "nodatasum"},
Chris Masonbe20aa92007-12-17 20:14:01 -0500173 {Opt_nodatacow, "nodatacow"},
Chris Mason21ad10c2008-01-09 09:23:21 -0500174 {Opt_nobarrier, "nobarrier"},
Chris Mason6f568d32008-01-29 16:03:38 -0500175 {Opt_max_inline, "max_inline=%s"},
Chris Mason8f662a72008-01-02 10:01:11 -0500176 {Opt_alloc_start, "alloc_start=%s"},
Chris Mason4543df72008-06-11 21:47:56 -0400177 {Opt_thread_pool, "thread_pool=%d"},
Chris Masonc8b97812008-10-29 14:49:59 -0400178 {Opt_compress, "compress"},
Li Zefan261507a02010-12-17 14:21:50 +0800179 {Opt_compress_type, "compress=%s"},
Chris Masona555f812010-01-28 16:18:15 -0500180 {Opt_compress_force, "compress-force"},
Li Zefan261507a02010-12-17 14:21:50 +0800181 {Opt_compress_force_type, "compress-force=%s"},
Chris Masone18e4802008-01-18 10:54:22 -0500182 {Opt_ssd, "ssd"},
Chris Mason451d7582009-06-09 20:28:34 -0400183 {Opt_ssd_spread, "ssd_spread"},
Chris Mason3b30c222009-06-09 16:42:22 -0400184 {Opt_nossd, "nossd"},
Josef Bacik33268ea2008-07-24 12:16:36 -0400185 {Opt_noacl, "noacl"},
Sage Weil3a5e1402009-04-02 16:49:40 -0400186 {Opt_notreelog, "notreelog"},
Sage Weildccae992009-04-02 16:59:01 -0400187 {Opt_flushoncommit, "flushoncommit"},
Josef Bacik97e728d2009-04-21 17:40:57 -0400188 {Opt_ratio, "metadata_ratio=%d"},
Christoph Hellwige244a0a2009-10-14 09:24:59 -0400189 {Opt_discard, "discard"},
Josef Bacik0af3d002010-06-21 14:48:16 -0400190 {Opt_space_cache, "space_cache"},
Josef Bacik88c2ba32010-09-21 14:21:34 -0400191 {Opt_clear_cache, "clear_cache"},
Sage Weil4260f7c2010-10-29 15:46:43 -0400192 {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"},
Chris Mason91435652011-02-16 13:10:41 -0500193 {Opt_enospc_debug, "enospc_debug"},
Xin Zhonge15d0542011-04-06 07:33:51 +0000194 {Opt_subvolrootid, "subvolrootid=%d"},
Chris Mason4cb53002011-05-24 15:35:30 -0400195 {Opt_defrag, "autodefrag"},
Chris Mason4b9465c2011-06-03 09:36:29 -0400196 {Opt_inode_cache, "inode_cache"},
Josef Bacik33268ea2008-07-24 12:16:36 -0400197 {Opt_err, NULL},
Chris Mason95e05282007-08-29 09:11:44 -0400198};
199
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400200/*
201 * Regular mount options parser. Everything that is needed only when
202 * reading in a new superblock is parsed here.
203 */
204int btrfs_parse_options(struct btrfs_root *root, char *options)
Chris Mason95e05282007-08-29 09:11:44 -0400205{
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400206 struct btrfs_fs_info *info = root->fs_info;
Chris Mason95e05282007-08-29 09:11:44 -0400207 substring_t args[MAX_OPT_ARGS];
Josef Bacikda495ec2010-02-25 20:38:35 +0000208 char *p, *num, *orig;
Chris Mason4543df72008-06-11 21:47:56 -0400209 int intarg;
Sage Weila7a3f7c2009-11-07 06:19:16 +0000210 int ret = 0;
Li Zefan261507a02010-12-17 14:21:50 +0800211 char *compress_type;
212 bool compress_force = false;
Chris Masonb6cda9b2007-12-14 15:30:32 -0500213
Chris Mason95e05282007-08-29 09:11:44 -0400214 if (!options)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400215 return 0;
Chris Mason95e05282007-08-29 09:11:44 -0400216
Chris Masonbe20aa92007-12-17 20:14:01 -0500217 /*
218 * strsep changes the string, duplicate it because parse_options
219 * gets called twice
220 */
221 options = kstrdup(options, GFP_NOFS);
222 if (!options)
223 return -ENOMEM;
224
Josef Bacikda495ec2010-02-25 20:38:35 +0000225 orig = options;
Chris Masonbe20aa92007-12-17 20:14:01 -0500226
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400227 while ((p = strsep(&options, ",")) != NULL) {
Chris Mason95e05282007-08-29 09:11:44 -0400228 int token;
229 if (!*p)
230 continue;
231
232 token = match_token(p, tokens, args);
233 switch (token) {
Chris Masondfe25022008-05-13 13:46:40 -0400234 case Opt_degraded:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400235 printk(KERN_INFO "btrfs: allowing degraded mounts\n");
236 btrfs_set_opt(info->mount_opt, DEGRADED);
Chris Masondfe25022008-05-13 13:46:40 -0400237 break;
Chris Mason95e05282007-08-29 09:11:44 -0400238 case Opt_subvol:
Josef Bacik73f73412009-12-04 17:38:27 +0000239 case Opt_subvolid:
Xin Zhonge15d0542011-04-06 07:33:51 +0000240 case Opt_subvolrootid:
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400241 case Opt_device:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400242 /*
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400243 * These are parsed by btrfs_parse_early_options
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400244 * and can be happily ignored here.
245 */
Chris Masonb6cda9b2007-12-14 15:30:32 -0500246 break;
247 case Opt_nodatasum:
Chris Mason067c28a2009-06-11 09:30:13 -0400248 printk(KERN_INFO "btrfs: setting nodatasum\n");
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400249 btrfs_set_opt(info->mount_opt, NODATASUM);
Chris Masonbe20aa92007-12-17 20:14:01 -0500250 break;
251 case Opt_nodatacow:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400252 printk(KERN_INFO "btrfs: setting nodatacow\n");
253 btrfs_set_opt(info->mount_opt, NODATACOW);
254 btrfs_set_opt(info->mount_opt, NODATASUM);
Chris Mason95e05282007-08-29 09:11:44 -0400255 break;
Chris Masona555f812010-01-28 16:18:15 -0500256 case Opt_compress_force:
Li Zefan261507a02010-12-17 14:21:50 +0800257 case Opt_compress_force_type:
258 compress_force = true;
259 case Opt_compress:
260 case Opt_compress_type:
261 if (token == Opt_compress ||
262 token == Opt_compress_force ||
263 strcmp(args[0].from, "zlib") == 0) {
264 compress_type = "zlib";
265 info->compress_type = BTRFS_COMPRESS_ZLIB;
Li Zefana6fa6fa2010-10-25 15:12:26 +0800266 } else if (strcmp(args[0].from, "lzo") == 0) {
267 compress_type = "lzo";
268 info->compress_type = BTRFS_COMPRESS_LZO;
Li Zefan261507a02010-12-17 14:21:50 +0800269 } else {
270 ret = -EINVAL;
271 goto out;
272 }
273
Chris Masona555f812010-01-28 16:18:15 -0500274 btrfs_set_opt(info->mount_opt, COMPRESS);
Li Zefan261507a02010-12-17 14:21:50 +0800275 if (compress_force) {
276 btrfs_set_opt(info->mount_opt, FORCE_COMPRESS);
277 pr_info("btrfs: force %s compression\n",
278 compress_type);
279 } else
280 pr_info("btrfs: use %s compression\n",
281 compress_type);
Chris Masona555f812010-01-28 16:18:15 -0500282 break;
Chris Masone18e4802008-01-18 10:54:22 -0500283 case Opt_ssd:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400284 printk(KERN_INFO "btrfs: use ssd allocation scheme\n");
285 btrfs_set_opt(info->mount_opt, SSD);
Chris Masone18e4802008-01-18 10:54:22 -0500286 break;
Chris Mason451d7582009-06-09 20:28:34 -0400287 case Opt_ssd_spread:
288 printk(KERN_INFO "btrfs: use spread ssd "
289 "allocation scheme\n");
290 btrfs_set_opt(info->mount_opt, SSD);
291 btrfs_set_opt(info->mount_opt, SSD_SPREAD);
292 break;
Chris Mason3b30c222009-06-09 16:42:22 -0400293 case Opt_nossd:
Chris Mason451d7582009-06-09 20:28:34 -0400294 printk(KERN_INFO "btrfs: not using ssd allocation "
295 "scheme\n");
Chris Masonc2898112009-06-10 09:51:32 -0400296 btrfs_set_opt(info->mount_opt, NOSSD);
Chris Mason3b30c222009-06-09 16:42:22 -0400297 btrfs_clear_opt(info->mount_opt, SSD);
Chris Mason451d7582009-06-09 20:28:34 -0400298 btrfs_clear_opt(info->mount_opt, SSD_SPREAD);
Chris Mason3b30c222009-06-09 16:42:22 -0400299 break;
Chris Mason21ad10c2008-01-09 09:23:21 -0500300 case Opt_nobarrier:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400301 printk(KERN_INFO "btrfs: turning off barriers\n");
302 btrfs_set_opt(info->mount_opt, NOBARRIER);
Chris Mason21ad10c2008-01-09 09:23:21 -0500303 break;
Chris Mason4543df72008-06-11 21:47:56 -0400304 case Opt_thread_pool:
305 intarg = 0;
306 match_int(&args[0], &intarg);
307 if (intarg) {
308 info->thread_pool_size = intarg;
309 printk(KERN_INFO "btrfs: thread pool %d\n",
310 info->thread_pool_size);
311 }
312 break;
Chris Mason6f568d32008-01-29 16:03:38 -0500313 case Opt_max_inline:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400314 num = match_strdup(&args[0]);
315 if (num) {
Akinobu Mita91748462010-02-28 10:59:11 +0000316 info->max_inline = memparse(num, NULL);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400317 kfree(num);
Chris Mason6f568d32008-01-29 16:03:38 -0500318
Chris Mason15ada042008-06-11 16:51:38 -0400319 if (info->max_inline) {
320 info->max_inline = max_t(u64,
321 info->max_inline,
322 root->sectorsize);
323 }
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400324 printk(KERN_INFO "btrfs: max_inline at %llu\n",
Joel Becker21380932009-04-21 12:38:29 -0700325 (unsigned long long)info->max_inline);
Chris Mason6f568d32008-01-29 16:03:38 -0500326 }
327 break;
Chris Mason8f662a72008-01-02 10:01:11 -0500328 case Opt_alloc_start:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400329 num = match_strdup(&args[0]);
330 if (num) {
Akinobu Mita91748462010-02-28 10:59:11 +0000331 info->alloc_start = memparse(num, NULL);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400332 kfree(num);
333 printk(KERN_INFO
334 "btrfs: allocations start at %llu\n",
Joel Becker21380932009-04-21 12:38:29 -0700335 (unsigned long long)info->alloc_start);
Chris Mason8f662a72008-01-02 10:01:11 -0500336 }
337 break;
Josef Bacik33268ea2008-07-24 12:16:36 -0400338 case Opt_noacl:
339 root->fs_info->sb->s_flags &= ~MS_POSIXACL;
340 break;
Sage Weil3a5e1402009-04-02 16:49:40 -0400341 case Opt_notreelog:
342 printk(KERN_INFO "btrfs: disabling tree log\n");
343 btrfs_set_opt(info->mount_opt, NOTREELOG);
344 break;
Sage Weildccae992009-04-02 16:59:01 -0400345 case Opt_flushoncommit:
346 printk(KERN_INFO "btrfs: turning on flush-on-commit\n");
347 btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT);
348 break;
Josef Bacik97e728d2009-04-21 17:40:57 -0400349 case Opt_ratio:
350 intarg = 0;
351 match_int(&args[0], &intarg);
352 if (intarg) {
353 info->metadata_ratio = intarg;
354 printk(KERN_INFO "btrfs: metadata ratio %d\n",
355 info->metadata_ratio);
356 }
357 break;
Christoph Hellwige244a0a2009-10-14 09:24:59 -0400358 case Opt_discard:
359 btrfs_set_opt(info->mount_opt, DISCARD);
360 break;
Josef Bacik0af3d002010-06-21 14:48:16 -0400361 case Opt_space_cache:
362 printk(KERN_INFO "btrfs: enabling disk space caching\n");
363 btrfs_set_opt(info->mount_opt, SPACE_CACHE);
Josef Bacik0de90872010-11-19 13:40:41 +0000364 break;
Chris Mason4b9465c2011-06-03 09:36:29 -0400365 case Opt_inode_cache:
366 printk(KERN_INFO "btrfs: enabling inode map caching\n");
367 btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE);
368 break;
Josef Bacik88c2ba32010-09-21 14:21:34 -0400369 case Opt_clear_cache:
370 printk(KERN_INFO "btrfs: force clearing of disk cache\n");
371 btrfs_set_opt(info->mount_opt, CLEAR_CACHE);
Josef Bacik0af3d002010-06-21 14:48:16 -0400372 break;
Sage Weil4260f7c2010-10-29 15:46:43 -0400373 case Opt_user_subvol_rm_allowed:
374 btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED);
375 break;
Chris Mason91435652011-02-16 13:10:41 -0500376 case Opt_enospc_debug:
377 btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG);
378 break;
Chris Mason4cb53002011-05-24 15:35:30 -0400379 case Opt_defrag:
380 printk(KERN_INFO "btrfs: enabling auto defrag");
381 btrfs_set_opt(info->mount_opt, AUTO_DEFRAG);
382 break;
Sage Weila7a3f7c2009-11-07 06:19:16 +0000383 case Opt_err:
384 printk(KERN_INFO "btrfs: unrecognized mount option "
385 "'%s'\n", p);
386 ret = -EINVAL;
387 goto out;
Chris Mason95e05282007-08-29 09:11:44 -0400388 default:
Chris Masonbe20aa92007-12-17 20:14:01 -0500389 break;
Chris Mason95e05282007-08-29 09:11:44 -0400390 }
391 }
Sage Weila7a3f7c2009-11-07 06:19:16 +0000392out:
Josef Bacikda495ec2010-02-25 20:38:35 +0000393 kfree(orig);
Sage Weila7a3f7c2009-11-07 06:19:16 +0000394 return ret;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400395}
396
397/*
398 * Parse mount options that are required early in the mount process.
399 *
400 * All other options will be parsed on much later in the mount process and
401 * only when we need to allocate a new super block.
402 */
Christoph Hellwig97288f22008-12-02 06:36:09 -0500403static int btrfs_parse_early_options(const char *options, fmode_t flags,
Josef Bacik73f73412009-12-04 17:38:27 +0000404 void *holder, char **subvol_name, u64 *subvol_objectid,
Xin Zhonge15d0542011-04-06 07:33:51 +0000405 u64 *subvol_rootid, struct btrfs_fs_devices **fs_devices)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400406{
407 substring_t args[MAX_OPT_ARGS];
Tero Roponen3f3d0bc2010-12-27 16:43:13 +0800408 char *opts, *orig, *p;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400409 int error = 0;
Josef Bacik73f73412009-12-04 17:38:27 +0000410 int intarg;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400411
412 if (!options)
413 goto out;
414
415 /*
416 * strsep changes the string, duplicate it because parse_options
417 * gets called twice
418 */
419 opts = kstrdup(options, GFP_KERNEL);
420 if (!opts)
421 return -ENOMEM;
Tero Roponen3f3d0bc2010-12-27 16:43:13 +0800422 orig = opts;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400423
424 while ((p = strsep(&opts, ",")) != NULL) {
425 int token;
426 if (!*p)
427 continue;
428
429 token = match_token(p, tokens, args);
430 switch (token) {
431 case Opt_subvol:
432 *subvol_name = match_strdup(&args[0]);
433 break;
Josef Bacik73f73412009-12-04 17:38:27 +0000434 case Opt_subvolid:
435 intarg = 0;
Josef Bacik4849f01d2009-12-14 19:18:38 +0000436 error = match_int(&args[0], &intarg);
437 if (!error) {
438 /* we want the original fs_tree */
439 if (!intarg)
440 *subvol_objectid =
441 BTRFS_FS_TREE_OBJECTID;
442 else
443 *subvol_objectid = intarg;
444 }
Josef Bacik73f73412009-12-04 17:38:27 +0000445 break;
Xin Zhonge15d0542011-04-06 07:33:51 +0000446 case Opt_subvolrootid:
447 intarg = 0;
448 error = match_int(&args[0], &intarg);
449 if (!error) {
450 /* we want the original fs_tree */
451 if (!intarg)
452 *subvol_rootid =
453 BTRFS_FS_TREE_OBJECTID;
454 else
455 *subvol_rootid = intarg;
456 }
457 break;
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400458 case Opt_device:
459 error = btrfs_scan_one_device(match_strdup(&args[0]),
460 flags, holder, fs_devices);
461 if (error)
462 goto out_free_opts;
463 break;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400464 default:
465 break;
466 }
467 }
468
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400469 out_free_opts:
Tero Roponen3f3d0bc2010-12-27 16:43:13 +0800470 kfree(orig);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400471 out:
472 /*
473 * If no subvolume name is specified we use the default one. Allocate
Chris Mason3de45862008-11-17 21:02:50 -0500474 * a copy of the string "." here so that code later in the
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400475 * mount path doesn't care if it's the default volume or another one.
476 */
477 if (!*subvol_name) {
Chris Mason3de45862008-11-17 21:02:50 -0500478 *subvol_name = kstrdup(".", GFP_KERNEL);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400479 if (!*subvol_name)
480 return -ENOMEM;
481 }
482 return error;
Chris Mason95e05282007-08-29 09:11:44 -0400483}
484
Josef Bacik73f73412009-12-04 17:38:27 +0000485static struct dentry *get_default_root(struct super_block *sb,
486 u64 subvol_objectid)
487{
488 struct btrfs_root *root = sb->s_fs_info;
489 struct btrfs_root *new_root;
490 struct btrfs_dir_item *di;
491 struct btrfs_path *path;
492 struct btrfs_key location;
493 struct inode *inode;
494 struct dentry *dentry;
495 u64 dir_id;
496 int new = 0;
497
498 /*
499 * We have a specific subvol we want to mount, just setup location and
500 * go look up the root.
501 */
502 if (subvol_objectid) {
503 location.objectid = subvol_objectid;
504 location.type = BTRFS_ROOT_ITEM_KEY;
505 location.offset = (u64)-1;
506 goto find_root;
507 }
508
509 path = btrfs_alloc_path();
510 if (!path)
511 return ERR_PTR(-ENOMEM);
512 path->leave_spinning = 1;
513
514 /*
515 * Find the "default" dir item which points to the root item that we
516 * will mount by default if we haven't been given a specific subvolume
517 * to mount.
518 */
519 dir_id = btrfs_super_root_dir(&root->fs_info->super_copy);
520 di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0);
Julia Lawallb0839162011-05-14 07:10:51 +0000521 if (IS_ERR(di)) {
522 btrfs_free_path(path);
Dan Carpenterfb4f6f92010-05-29 09:40:57 +0000523 return ERR_CAST(di);
Julia Lawallb0839162011-05-14 07:10:51 +0000524 }
Josef Bacik73f73412009-12-04 17:38:27 +0000525 if (!di) {
526 /*
527 * Ok the default dir item isn't there. This is weird since
528 * it's always been there, but don't freak out, just try and
529 * mount to root most subvolume.
530 */
531 btrfs_free_path(path);
532 dir_id = BTRFS_FIRST_FREE_OBJECTID;
533 new_root = root->fs_info->fs_root;
534 goto setup_root;
535 }
536
537 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location);
538 btrfs_free_path(path);
539
540find_root:
541 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
542 if (IS_ERR(new_root))
Julia Lawalld0b678c2010-10-29 15:14:23 -0400543 return ERR_CAST(new_root);
Josef Bacik73f73412009-12-04 17:38:27 +0000544
545 if (btrfs_root_refs(&new_root->root_item) == 0)
546 return ERR_PTR(-ENOENT);
547
548 dir_id = btrfs_root_dirid(&new_root->root_item);
549setup_root:
550 location.objectid = dir_id;
551 location.type = BTRFS_INODE_ITEM_KEY;
552 location.offset = 0;
553
554 inode = btrfs_iget(sb, &location, new_root, &new);
Dan Carpenter4cbd1142010-05-29 09:42:19 +0000555 if (IS_ERR(inode))
556 return ERR_CAST(inode);
Josef Bacik73f73412009-12-04 17:38:27 +0000557
558 /*
559 * If we're just mounting the root most subvol put the inode and return
560 * a reference to the dentry. We will have already gotten a reference
561 * to the inode in btrfs_fill_super so we're good to go.
562 */
563 if (!new && sb->s_root->d_inode == inode) {
564 iput(inode);
565 return dget(sb->s_root);
566 }
567
568 if (new) {
569 const struct qstr name = { .name = "/", .len = 1 };
570
571 /*
572 * New inode, we need to make the dentry a sibling of s_root so
573 * everything gets cleaned up properly on unmount.
574 */
575 dentry = d_alloc(sb->s_root, &name);
576 if (!dentry) {
577 iput(inode);
578 return ERR_PTR(-ENOMEM);
579 }
580 d_splice_alias(inode, dentry);
581 } else {
582 /*
583 * We found the inode in cache, just find a dentry for it and
584 * put the reference to the inode we just got.
585 */
586 dentry = d_find_alias(inode);
587 iput(inode);
588 }
589
590 return dentry;
591}
592
Chris Masond3977122009-01-05 21:25:51 -0500593static int btrfs_fill_super(struct super_block *sb,
Chris Mason8a4b83c2008-03-24 15:02:07 -0400594 struct btrfs_fs_devices *fs_devices,
Chris Masond3977122009-01-05 21:25:51 -0500595 void *data, int silent)
Chris Mason2e635a22007-03-21 11:12:56 -0400596{
Chris Masond3977122009-01-05 21:25:51 -0500597 struct inode *inode;
598 struct dentry *root_dentry;
Chris Mason0f7d52f2007-04-09 10:42:37 -0400599 struct btrfs_root *tree_root;
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400600 struct btrfs_key key;
Chris Mason39279cc2007-06-12 06:35:45 -0400601 int err;
Chris Mason2e635a22007-03-21 11:12:56 -0400602
603 sb->s_maxbytes = MAX_LFS_FILESIZE;
Chris Mason2e635a22007-03-21 11:12:56 -0400604 sb->s_magic = BTRFS_SUPER_MAGIC;
Chris Masone20d96d2007-03-22 12:13:20 -0400605 sb->s_op = &btrfs_super_ops;
Al Viroaf53d292010-12-20 10:56:06 -0500606 sb->s_d_op = &btrfs_dentry_operations;
Balaji Raobe6e8dc2008-07-21 02:01:56 +0530607 sb->s_export_op = &btrfs_export_ops;
Josef Bacik5103e942007-11-16 11:45:54 -0500608 sb->s_xattr = btrfs_xattr_handlers;
Chris Mason2e635a22007-03-21 11:12:56 -0400609 sb->s_time_gran = 1;
Chris Mason0eda2942009-10-13 13:50:18 -0400610#ifdef CONFIG_BTRFS_FS_POSIX_ACL
Josef Bacik33268ea2008-07-24 12:16:36 -0400611 sb->s_flags |= MS_POSIXACL;
Chris Ball49cf6f42009-09-29 13:51:04 -0400612#endif
Chris Masone20d96d2007-03-22 12:13:20 -0400613
Chris Masondfe25022008-05-13 13:46:40 -0400614 tree_root = open_ctree(sb, fs_devices, (char *)data);
Chris Masond98237b2007-03-28 13:57:48 -0400615
Yane58ca022008-04-01 11:21:34 -0400616 if (IS_ERR(tree_root)) {
Chris Masone20d96d2007-03-22 12:13:20 -0400617 printk("btrfs: open_ctree failed\n");
Yane58ca022008-04-01 11:21:34 -0400618 return PTR_ERR(tree_root);
Chris Masone20d96d2007-03-22 12:13:20 -0400619 }
Chris Mason0f7d52f2007-04-09 10:42:37 -0400620 sb->s_fs_info = tree_root;
Chris Masonb888db22007-08-27 16:49:44 -0400621
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400622 key.objectid = BTRFS_FIRST_FREE_OBJECTID;
623 key.type = BTRFS_INODE_ITEM_KEY;
624 key.offset = 0;
Josef Bacik73f73412009-12-04 17:38:27 +0000625 inode = btrfs_iget(sb, &key, tree_root->fs_info->fs_root, NULL);
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400626 if (IS_ERR(inode)) {
627 err = PTR_ERR(inode);
Chris Mason39279cc2007-06-12 06:35:45 -0400628 goto fail_close;
629 }
Chris Mason2e635a22007-03-21 11:12:56 -0400630
Chris Masone20d96d2007-03-22 12:13:20 -0400631 root_dentry = d_alloc_root(inode);
632 if (!root_dentry) {
Chris Mason2e635a22007-03-21 11:12:56 -0400633 iput(inode);
Chris Mason39279cc2007-06-12 06:35:45 -0400634 err = -ENOMEM;
635 goto fail_close;
Chris Mason2e635a22007-03-21 11:12:56 -0400636 }
Josef Bacik58176a92007-08-29 15:47:34 -0400637
Chris Masone20d96d2007-03-22 12:13:20 -0400638 sb->s_root = root_dentry;
Chris Mason6885f302008-02-20 16:11:05 -0500639
Chris Mason6885f302008-02-20 16:11:05 -0500640 save_mount_options(sb, data);
Chris Mason2e635a22007-03-21 11:12:56 -0400641 return 0;
Chris Mason2e635a22007-03-21 11:12:56 -0400642
Chris Mason39279cc2007-06-12 06:35:45 -0400643fail_close:
644 close_ctree(tree_root);
Chris Masond5719762007-03-23 10:01:08 -0400645 return err;
646}
647
Sage Weil6bf13c02008-06-10 10:07:39 -0400648int btrfs_sync_fs(struct super_block *sb, int wait)
Chris Masond5719762007-03-23 10:01:08 -0400649{
650 struct btrfs_trans_handle *trans;
Sage Weildccae992009-04-02 16:59:01 -0400651 struct btrfs_root *root = btrfs_sb(sb);
Chris Masond5719762007-03-23 10:01:08 -0400652 int ret;
Chris Masondf2ce342007-03-23 11:00:45 -0400653
liubo1abe9b82011-03-24 11:18:59 +0000654 trace_btrfs_sync_fs(wait);
655
Chris Masond561c022007-03-23 19:47:49 -0400656 if (!wait) {
Chris Mason7cfcc172007-04-02 14:53:59 -0400657 filemap_flush(root->fs_info->btree_inode->i_mapping);
Chris Masond561c022007-03-23 19:47:49 -0400658 return 0;
659 }
Chris Mason771ed682008-11-06 22:02:51 -0500660
Yan, Zheng24bbcf02009-11-12 09:36:34 +0000661 btrfs_start_delalloc_inodes(root, 0);
662 btrfs_wait_ordered_extents(root, 0, 0);
Chris Mason771ed682008-11-06 22:02:51 -0500663
Yan, Zhenga22285a2010-05-16 10:48:46 -0400664 trans = btrfs_start_transaction(root, 0);
Tsutomu Itoh98d5dc12011-01-20 06:19:37 +0000665 if (IS_ERR(trans))
666 return PTR_ERR(trans);
Chris Masond5719762007-03-23 10:01:08 -0400667 ret = btrfs_commit_transaction(trans, root);
Chris Mason54aa1f42007-06-22 14:16:25 -0400668 return ret;
Chris Masond5719762007-03-23 10:01:08 -0400669}
670
Eric Parisa9572a12009-04-02 16:46:06 -0400671static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
672{
673 struct btrfs_root *root = btrfs_sb(vfs->mnt_sb);
674 struct btrfs_fs_info *info = root->fs_info;
Tsutomu Itoh200da642011-03-31 00:44:29 +0000675 char *compress_type;
Eric Parisa9572a12009-04-02 16:46:06 -0400676
677 if (btrfs_test_opt(root, DEGRADED))
678 seq_puts(seq, ",degraded");
679 if (btrfs_test_opt(root, NODATASUM))
680 seq_puts(seq, ",nodatasum");
681 if (btrfs_test_opt(root, NODATACOW))
682 seq_puts(seq, ",nodatacow");
683 if (btrfs_test_opt(root, NOBARRIER))
684 seq_puts(seq, ",nobarrier");
Eric Parisa9572a12009-04-02 16:46:06 -0400685 if (info->max_inline != 8192 * 1024)
Joel Becker21380932009-04-21 12:38:29 -0700686 seq_printf(seq, ",max_inline=%llu",
687 (unsigned long long)info->max_inline);
Eric Parisa9572a12009-04-02 16:46:06 -0400688 if (info->alloc_start != 0)
Joel Becker21380932009-04-21 12:38:29 -0700689 seq_printf(seq, ",alloc_start=%llu",
690 (unsigned long long)info->alloc_start);
Eric Parisa9572a12009-04-02 16:46:06 -0400691 if (info->thread_pool_size != min_t(unsigned long,
692 num_online_cpus() + 2, 8))
693 seq_printf(seq, ",thread_pool=%d", info->thread_pool_size);
Tsutomu Itoh200da642011-03-31 00:44:29 +0000694 if (btrfs_test_opt(root, COMPRESS)) {
695 if (info->compress_type == BTRFS_COMPRESS_ZLIB)
696 compress_type = "zlib";
697 else
698 compress_type = "lzo";
699 if (btrfs_test_opt(root, FORCE_COMPRESS))
700 seq_printf(seq, ",compress-force=%s", compress_type);
701 else
702 seq_printf(seq, ",compress=%s", compress_type);
703 }
Chris Masonc2898112009-06-10 09:51:32 -0400704 if (btrfs_test_opt(root, NOSSD))
705 seq_puts(seq, ",nossd");
Chris Mason451d7582009-06-09 20:28:34 -0400706 if (btrfs_test_opt(root, SSD_SPREAD))
707 seq_puts(seq, ",ssd_spread");
708 else if (btrfs_test_opt(root, SSD))
Eric Parisa9572a12009-04-02 16:46:06 -0400709 seq_puts(seq, ",ssd");
Sage Weil3a5e1402009-04-02 16:49:40 -0400710 if (btrfs_test_opt(root, NOTREELOG))
Sage Weil6b65c5c2009-05-14 13:52:21 -0400711 seq_puts(seq, ",notreelog");
Sage Weildccae992009-04-02 16:59:01 -0400712 if (btrfs_test_opt(root, FLUSHONCOMMIT))
Sage Weil6b65c5c2009-05-14 13:52:21 -0400713 seq_puts(seq, ",flushoncommit");
Matthew Wilcox20a52392009-12-14 22:01:12 +0000714 if (btrfs_test_opt(root, DISCARD))
715 seq_puts(seq, ",discard");
Eric Parisa9572a12009-04-02 16:46:06 -0400716 if (!(root->fs_info->sb->s_flags & MS_POSIXACL))
717 seq_puts(seq, ",noacl");
Tsutomu Itoh200da642011-03-31 00:44:29 +0000718 if (btrfs_test_opt(root, SPACE_CACHE))
719 seq_puts(seq, ",space_cache");
720 if (btrfs_test_opt(root, CLEAR_CACHE))
721 seq_puts(seq, ",clear_cache");
722 if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
723 seq_puts(seq, ",user_subvol_rm_allowed");
Eric Parisa9572a12009-04-02 16:46:06 -0400724 return 0;
725}
726
Chris Masona061fc82008-05-07 11:43:44 -0400727static int btrfs_test_super(struct super_block *s, void *data)
Chris Mason2e635a22007-03-21 11:12:56 -0400728{
Josef Bacik450ba0e2010-11-19 14:59:15 -0500729 struct btrfs_root *test_root = data;
Chris Masona061fc82008-05-07 11:43:44 -0400730 struct btrfs_root *root = btrfs_sb(s);
Yan4b82d6e2007-08-29 09:11:44 -0400731
Ian Kent619c8c72010-11-22 02:21:38 +0000732 /*
733 * If this super block is going away, return false as it
734 * can't match as an existing super block.
735 */
736 if (!atomic_read(&s->s_active))
737 return 0;
Josef Bacik450ba0e2010-11-19 14:59:15 -0500738 return root->fs_info->fs_devices == test_root->fs_info->fs_devices;
Yan4b82d6e2007-08-29 09:11:44 -0400739}
740
Josef Bacik450ba0e2010-11-19 14:59:15 -0500741static int btrfs_set_super(struct super_block *s, void *data)
742{
743 s->s_fs_info = data;
744
745 return set_anon_super(s, data);
746}
747
748
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400749/*
750 * Find a superblock for the given device / mount point.
751 *
752 * Note: This is based on get_sb_bdev from fs/super.c with a few additions
753 * for multiple device setup. Make sure to keep it in sync.
754 */
Al Viro061dbc62010-07-26 16:21:33 +0400755static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
David Sterba306e16c2011-04-19 14:29:38 +0200756 const char *device_name, void *data)
Yan4b82d6e2007-08-29 09:11:44 -0400757{
758 struct block_device *bdev = NULL;
759 struct super_block *s;
760 struct dentry *root;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400761 struct btrfs_fs_devices *fs_devices = NULL;
Josef Bacik450ba0e2010-11-19 14:59:15 -0500762 struct btrfs_root *tree_root = NULL;
763 struct btrfs_fs_info *fs_info = NULL;
Christoph Hellwig97288f22008-12-02 06:36:09 -0500764 fmode_t mode = FMODE_READ;
Josef Bacik73f73412009-12-04 17:38:27 +0000765 char *subvol_name = NULL;
766 u64 subvol_objectid = 0;
Xin Zhonge15d0542011-04-06 07:33:51 +0000767 u64 subvol_rootid = 0;
Yan4b82d6e2007-08-29 09:11:44 -0400768 int error = 0;
769
Christoph Hellwig97288f22008-12-02 06:36:09 -0500770 if (!(flags & MS_RDONLY))
771 mode |= FMODE_WRITE;
772
773 error = btrfs_parse_early_options(data, mode, fs_type,
Josef Bacik73f73412009-12-04 17:38:27 +0000774 &subvol_name, &subvol_objectid,
Xin Zhonge15d0542011-04-06 07:33:51 +0000775 &subvol_rootid, &fs_devices);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400776 if (error)
Al Viro061dbc62010-07-26 16:21:33 +0400777 return ERR_PTR(error);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400778
David Sterba306e16c2011-04-19 14:29:38 +0200779 error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400780 if (error)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400781 goto error_free_subvol_name;
Yan4b82d6e2007-08-29 09:11:44 -0400782
Christoph Hellwig97288f22008-12-02 06:36:09 -0500783 error = btrfs_open_devices(fs_devices, mode, fs_type);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400784 if (error)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400785 goto error_free_subvol_name;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400786
Yan Zheng2b820322008-11-17 21:11:30 -0500787 if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) {
788 error = -EACCES;
789 goto error_close_devices;
790 }
791
Josef Bacik450ba0e2010-11-19 14:59:15 -0500792 /*
793 * Setup a dummy root and fs_info for test/set super. This is because
794 * we don't actually fill this stuff out until open_ctree, but we need
795 * it for searching for existing supers, so this lets us do that and
796 * then open_ctree will properly initialize everything later.
797 */
798 fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS);
799 tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
800 if (!fs_info || !tree_root) {
801 error = -ENOMEM;
802 goto error_close_devices;
803 }
804 fs_info->tree_root = tree_root;
805 fs_info->fs_devices = fs_devices;
806 tree_root->fs_info = fs_info;
807
Chris Masondfe25022008-05-13 13:46:40 -0400808 bdev = fs_devices->latest_bdev;
Josef Bacik450ba0e2010-11-19 14:59:15 -0500809 s = sget(fs_type, btrfs_test_super, btrfs_set_super, tree_root);
Yan4b82d6e2007-08-29 09:11:44 -0400810 if (IS_ERR(s))
811 goto error_s;
812
813 if (s->s_root) {
814 if ((flags ^ s->s_flags) & MS_RDONLY) {
Al Viro6f5bbff2009-05-06 01:34:22 -0400815 deactivate_locked_super(s);
Yan4b82d6e2007-08-29 09:11:44 -0400816 error = -EBUSY;
Yan Zhengc146afa2008-11-12 14:34:12 -0500817 goto error_close_devices;
Yan4b82d6e2007-08-29 09:11:44 -0400818 }
819
Yan Zheng2b820322008-11-17 21:11:30 -0500820 btrfs_close_devices(fs_devices);
Ian Kentbdc924b2010-12-27 16:33:15 +0800821 kfree(fs_info);
822 kfree(tree_root);
Yan4b82d6e2007-08-29 09:11:44 -0400823 } else {
824 char b[BDEVNAME_SIZE];
825
826 s->s_flags = flags;
827 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
Chris Mason8a4b83c2008-03-24 15:02:07 -0400828 error = btrfs_fill_super(s, fs_devices, data,
829 flags & MS_SILENT ? 1 : 0);
Yan4b82d6e2007-08-29 09:11:44 -0400830 if (error) {
Al Viro6f5bbff2009-05-06 01:34:22 -0400831 deactivate_locked_super(s);
Shen Feng1f483662009-01-05 15:43:42 -0500832 goto error_free_subvol_name;
Yan4b82d6e2007-08-29 09:11:44 -0400833 }
834
Chris Mason788f20e2008-04-28 15:29:42 -0400835 btrfs_sb(s)->fs_info->bdev_holder = fs_type;
Yan4b82d6e2007-08-29 09:11:44 -0400836 s->s_flags |= MS_ACTIVE;
837 }
838
Josef Bacik73f73412009-12-04 17:38:27 +0000839 /* if they gave us a subvolume name bind mount into that */
840 if (strcmp(subvol_name, ".")) {
841 struct dentry *new_root;
Xin Zhonge15d0542011-04-06 07:33:51 +0000842
843 root = get_default_root(s, subvol_rootid);
844 if (IS_ERR(root)) {
845 error = PTR_ERR(root);
846 deactivate_locked_super(s);
847 goto error_free_subvol_name;
848 }
849
Josef Bacik73f73412009-12-04 17:38:27 +0000850 mutex_lock(&root->d_inode->i_mutex);
851 new_root = lookup_one_len(subvol_name, root,
Chris Masond3977122009-01-05 21:25:51 -0500852 strlen(subvol_name));
Josef Bacik73f73412009-12-04 17:38:27 +0000853 mutex_unlock(&root->d_inode->i_mutex);
Chris Masond3977122009-01-05 21:25:51 -0500854
Josef Bacik73f73412009-12-04 17:38:27 +0000855 if (IS_ERR(new_root)) {
Li Zefanf106e822010-12-07 01:51:26 +0000856 dput(root);
Al Viro6f5bbff2009-05-06 01:34:22 -0400857 deactivate_locked_super(s);
Josef Bacik73f73412009-12-04 17:38:27 +0000858 error = PTR_ERR(new_root);
Josef Bacik0e783402010-10-22 15:26:53 -0400859 goto error_free_subvol_name;
Josef Bacik73f73412009-12-04 17:38:27 +0000860 }
861 if (!new_root->d_inode) {
862 dput(root);
863 dput(new_root);
Al Viro6f5bbff2009-05-06 01:34:22 -0400864 deactivate_locked_super(s);
David Woodhouse76fcef12008-08-19 16:49:35 +0100865 error = -ENXIO;
Josef Bacik0e783402010-10-22 15:26:53 -0400866 goto error_free_subvol_name;
David Woodhouse76fcef12008-08-19 16:49:35 +0100867 }
Josef Bacik73f73412009-12-04 17:38:27 +0000868 dput(root);
869 root = new_root;
Xin Zhonge15d0542011-04-06 07:33:51 +0000870 } else {
871 root = get_default_root(s, subvol_objectid);
872 if (IS_ERR(root)) {
873 error = PTR_ERR(root);
874 deactivate_locked_super(s);
875 goto error_free_subvol_name;
876 }
Yan4b82d6e2007-08-29 09:11:44 -0400877 }
878
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400879 kfree(subvol_name);
Al Viro061dbc62010-07-26 16:21:33 +0400880 return root;
Yan4b82d6e2007-08-29 09:11:44 -0400881
882error_s:
883 error = PTR_ERR(s);
Yan Zhengc146afa2008-11-12 14:34:12 -0500884error_close_devices:
Chris Mason8a4b83c2008-03-24 15:02:07 -0400885 btrfs_close_devices(fs_devices);
Josef Bacik450ba0e2010-11-19 14:59:15 -0500886 kfree(fs_info);
887 kfree(tree_root);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400888error_free_subvol_name:
889 kfree(subvol_name);
Al Viro061dbc62010-07-26 16:21:33 +0400890 return ERR_PTR(error);
Yan4b82d6e2007-08-29 09:11:44 -0400891}
Chris Mason2e635a22007-03-21 11:12:56 -0400892
Yan Zhengc146afa2008-11-12 14:34:12 -0500893static int btrfs_remount(struct super_block *sb, int *flags, char *data)
894{
895 struct btrfs_root *root = btrfs_sb(sb);
896 int ret;
897
Chris Masonb2880522009-02-12 09:37:35 -0500898 ret = btrfs_parse_options(root, data);
899 if (ret)
900 return -EINVAL;
901
Yan Zhengc146afa2008-11-12 14:34:12 -0500902 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
903 return 0;
904
905 if (*flags & MS_RDONLY) {
906 sb->s_flags |= MS_RDONLY;
907
908 ret = btrfs_commit_super(root);
909 WARN_ON(ret);
910 } else {
Yan Zheng2b820322008-11-17 21:11:30 -0500911 if (root->fs_info->fs_devices->rw_devices == 0)
912 return -EACCES;
913
Yan Zhengc146afa2008-11-12 14:34:12 -0500914 if (btrfs_super_log_root(&root->fs_info->super_copy) != 0)
915 return -EINVAL;
916
Yan, Zhengd68fc572010-05-16 10:49:58 -0400917 ret = btrfs_cleanup_fs_roots(root->fs_info);
Yan Zhengc146afa2008-11-12 14:34:12 -0500918 WARN_ON(ret);
919
Yan, Zhengd68fc572010-05-16 10:49:58 -0400920 /* recover relocation */
921 ret = btrfs_recover_relocation(root);
Yan Zhengc146afa2008-11-12 14:34:12 -0500922 WARN_ON(ret);
923
924 sb->s_flags &= ~MS_RDONLY;
925 }
926
927 return 0;
928}
929
Arne Jansenbcd53742011-04-12 10:43:21 +0200930/* Used to sort the devices by max_avail(descending sort) */
931static int btrfs_cmp_device_free_bytes(const void *dev_info1,
932 const void *dev_info2)
933{
934 if (((struct btrfs_device_info *)dev_info1)->max_avail >
935 ((struct btrfs_device_info *)dev_info2)->max_avail)
936 return -1;
937 else if (((struct btrfs_device_info *)dev_info1)->max_avail <
938 ((struct btrfs_device_info *)dev_info2)->max_avail)
939 return 1;
940 else
941 return 0;
942}
943
944/*
945 * sort the devices by max_avail, in which max free extent size of each device
946 * is stored.(Descending Sort)
947 */
948static inline void btrfs_descending_sort_devices(
949 struct btrfs_device_info *devices,
950 size_t nr_devices)
951{
952 sort(devices, nr_devices, sizeof(struct btrfs_device_info),
953 btrfs_cmp_device_free_bytes, NULL);
954}
955
Miao Xie6d07bce2011-01-05 10:07:31 +0000956/*
957 * The helper to calc the free space on the devices that can be used to store
958 * file data.
959 */
960static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes)
961{
962 struct btrfs_fs_info *fs_info = root->fs_info;
963 struct btrfs_device_info *devices_info;
964 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
965 struct btrfs_device *device;
966 u64 skip_space;
967 u64 type;
968 u64 avail_space;
969 u64 used_space;
970 u64 min_stripe_size;
971 int min_stripes = 1;
972 int i = 0, nr_devices;
973 int ret;
974
975 nr_devices = fs_info->fs_devices->rw_devices;
976 BUG_ON(!nr_devices);
977
978 devices_info = kmalloc(sizeof(*devices_info) * nr_devices,
979 GFP_NOFS);
980 if (!devices_info)
981 return -ENOMEM;
982
983 /* calc min stripe number for data space alloction */
984 type = btrfs_get_alloc_profile(root, 1);
985 if (type & BTRFS_BLOCK_GROUP_RAID0)
986 min_stripes = 2;
987 else if (type & BTRFS_BLOCK_GROUP_RAID1)
988 min_stripes = 2;
989 else if (type & BTRFS_BLOCK_GROUP_RAID10)
990 min_stripes = 4;
991
992 if (type & BTRFS_BLOCK_GROUP_DUP)
993 min_stripe_size = 2 * BTRFS_STRIPE_LEN;
994 else
995 min_stripe_size = BTRFS_STRIPE_LEN;
996
997 list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) {
998 if (!device->in_fs_metadata)
999 continue;
1000
1001 avail_space = device->total_bytes - device->bytes_used;
1002
1003 /* align with stripe_len */
1004 do_div(avail_space, BTRFS_STRIPE_LEN);
1005 avail_space *= BTRFS_STRIPE_LEN;
1006
1007 /*
1008 * In order to avoid overwritting the superblock on the drive,
1009 * btrfs starts at an offset of at least 1MB when doing chunk
1010 * allocation.
1011 */
1012 skip_space = 1024 * 1024;
1013
1014 /* user can set the offset in fs_info->alloc_start. */
1015 if (fs_info->alloc_start + BTRFS_STRIPE_LEN <=
1016 device->total_bytes)
1017 skip_space = max(fs_info->alloc_start, skip_space);
1018
1019 /*
1020 * btrfs can not use the free space in [0, skip_space - 1],
1021 * we must subtract it from the total. In order to implement
1022 * it, we account the used space in this range first.
1023 */
1024 ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1,
1025 &used_space);
1026 if (ret) {
1027 kfree(devices_info);
1028 return ret;
1029 }
1030
1031 /* calc the free space in [0, skip_space - 1] */
1032 skip_space -= used_space;
1033
1034 /*
1035 * we can use the free space in [0, skip_space - 1], subtract
1036 * it from the total.
1037 */
1038 if (avail_space && avail_space >= skip_space)
1039 avail_space -= skip_space;
1040 else
1041 avail_space = 0;
1042
1043 if (avail_space < min_stripe_size)
1044 continue;
1045
1046 devices_info[i].dev = device;
1047 devices_info[i].max_avail = avail_space;
1048
1049 i++;
1050 }
1051
1052 nr_devices = i;
1053
1054 btrfs_descending_sort_devices(devices_info, nr_devices);
1055
1056 i = nr_devices - 1;
1057 avail_space = 0;
1058 while (nr_devices >= min_stripes) {
1059 if (devices_info[i].max_avail >= min_stripe_size) {
1060 int j;
1061 u64 alloc_size;
1062
1063 avail_space += devices_info[i].max_avail * min_stripes;
1064 alloc_size = devices_info[i].max_avail;
1065 for (j = i + 1 - min_stripes; j <= i; j++)
1066 devices_info[j].max_avail -= alloc_size;
1067 }
1068 i--;
1069 nr_devices--;
1070 }
1071
1072 kfree(devices_info);
1073 *free_bytes = avail_space;
1074 return 0;
1075}
1076
Chris Mason8fd17792007-04-19 21:01:03 -04001077static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1078{
1079 struct btrfs_root *root = btrfs_sb(dentry->d_sb);
Chris Mason4b52dff2007-06-26 10:06:50 -04001080 struct btrfs_super_block *disk_super = &root->fs_info->super_copy;
Josef Bacikbd4d1082010-03-05 21:59:21 +00001081 struct list_head *head = &root->fs_info->space_info;
1082 struct btrfs_space_info *found;
1083 u64 total_used = 0;
Miao Xie6d07bce2011-01-05 10:07:31 +00001084 u64 total_free_data = 0;
Chris Masondb945352007-10-15 16:15:53 -04001085 int bits = dentry->d_sb->s_blocksize_bits;
David Woodhouse9d036322008-08-18 12:01:52 +01001086 __be32 *fsid = (__be32 *)root->fs_info->fsid;
Miao Xie6d07bce2011-01-05 10:07:31 +00001087 int ret;
Chris Mason8fd17792007-04-19 21:01:03 -04001088
Miao Xie6d07bce2011-01-05 10:07:31 +00001089 /* holding chunk_muext to avoid allocating new chunks */
1090 mutex_lock(&root->fs_info->chunk_mutex);
Josef Bacikbd4d1082010-03-05 21:59:21 +00001091 rcu_read_lock();
Josef Bacik89a55892010-10-14 14:52:27 -04001092 list_for_each_entry_rcu(found, head, list) {
Miao Xie6d07bce2011-01-05 10:07:31 +00001093 if (found->flags & BTRFS_BLOCK_GROUP_DATA) {
1094 total_free_data += found->disk_total - found->disk_used;
1095 total_free_data -=
1096 btrfs_account_ro_block_groups_free_space(found);
1097 }
1098
Yan, Zhengb742bb82010-05-16 10:46:24 -04001099 total_used += found->disk_used;
Josef Bacik89a55892010-10-14 14:52:27 -04001100 }
Josef Bacikbd4d1082010-03-05 21:59:21 +00001101 rcu_read_unlock();
1102
Chris Mason8fd17792007-04-19 21:01:03 -04001103 buf->f_namelen = BTRFS_NAME_LEN;
Chris Masondb945352007-10-15 16:15:53 -04001104 buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits;
Josef Bacikbd4d1082010-03-05 21:59:21 +00001105 buf->f_bfree = buf->f_blocks - (total_used >> bits);
Chris Mason8fd17792007-04-19 21:01:03 -04001106 buf->f_bsize = dentry->d_sb->s_blocksize;
1107 buf->f_type = BTRFS_SUPER_MAGIC;
Miao Xie6d07bce2011-01-05 10:07:31 +00001108 buf->f_bavail = total_free_data;
1109 ret = btrfs_calc_avail_data_space(root, &total_free_data);
1110 if (ret) {
1111 mutex_unlock(&root->fs_info->chunk_mutex);
1112 return ret;
1113 }
1114 buf->f_bavail += total_free_data;
1115 buf->f_bavail = buf->f_bavail >> bits;
1116 mutex_unlock(&root->fs_info->chunk_mutex);
Chris Masond3977122009-01-05 21:25:51 -05001117
David Woodhouse9d036322008-08-18 12:01:52 +01001118 /* We treat it as constant endianness (it doesn't matter _which_)
Chris Masond3977122009-01-05 21:25:51 -05001119 because we want the fsid to come out the same whether mounted
David Woodhouse9d036322008-08-18 12:01:52 +01001120 on a big-endian or little-endian host */
1121 buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]);
1122 buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]);
David Woodhouse32d48fa2008-08-18 13:10:20 +01001123 /* Mask in the root object ID too, to disambiguate subvols */
1124 buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32;
1125 buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid;
1126
Chris Mason8fd17792007-04-19 21:01:03 -04001127 return 0;
1128}
Chris Masonb5133862007-04-24 11:52:22 -04001129
Chris Mason2e635a22007-03-21 11:12:56 -04001130static struct file_system_type btrfs_fs_type = {
1131 .owner = THIS_MODULE,
1132 .name = "btrfs",
Al Viro061dbc62010-07-26 16:21:33 +04001133 .mount = btrfs_mount,
Chris Masona061fc82008-05-07 11:43:44 -04001134 .kill_sb = kill_anon_super,
Chris Mason2e635a22007-03-21 11:12:56 -04001135 .fs_flags = FS_REQUIRES_DEV,
1136};
Chris Masona9218f62008-03-24 15:02:04 -04001137
Chris Masond352ac62008-09-29 15:18:18 -04001138/*
1139 * used by btrfsctl to scan devices when no FS is mounted
1140 */
Chris Mason8a4b83c2008-03-24 15:02:07 -04001141static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
1142 unsigned long arg)
1143{
1144 struct btrfs_ioctl_vol_args *vol;
1145 struct btrfs_fs_devices *fs_devices;
Chris Masonc071fcf2009-01-16 11:59:08 -05001146 int ret = -ENOTTY;
Chris Mason8a4b83c2008-03-24 15:02:07 -04001147
Chris Masone441d542009-01-05 16:57:23 -05001148 if (!capable(CAP_SYS_ADMIN))
1149 return -EPERM;
1150
Li Zefandae7b662009-04-08 15:06:54 +08001151 vol = memdup_user((void __user *)arg, sizeof(*vol));
1152 if (IS_ERR(vol))
1153 return PTR_ERR(vol);
Chris Masonc071fcf2009-01-16 11:59:08 -05001154
Chris Mason8a4b83c2008-03-24 15:02:07 -04001155 switch (cmd) {
1156 case BTRFS_IOC_SCAN_DEV:
Christoph Hellwig97288f22008-12-02 06:36:09 -05001157 ret = btrfs_scan_one_device(vol->name, FMODE_READ,
Chris Mason8a4b83c2008-03-24 15:02:07 -04001158 &btrfs_fs_type, &fs_devices);
1159 break;
1160 }
Li Zefandae7b662009-04-08 15:06:54 +08001161
Chris Mason8a4b83c2008-03-24 15:02:07 -04001162 kfree(vol);
Linda Knippersf819d832008-06-09 22:17:11 -04001163 return ret;
Chris Mason8a4b83c2008-03-24 15:02:07 -04001164}
1165
Linus Torvalds01762602009-01-10 06:09:52 -08001166static int btrfs_freeze(struct super_block *sb)
Yaned0dab62008-01-22 12:46:56 -05001167{
1168 struct btrfs_root *root = btrfs_sb(sb);
Chris Masona74a4b92008-06-25 16:01:31 -04001169 mutex_lock(&root->fs_info->transaction_kthread_mutex);
1170 mutex_lock(&root->fs_info->cleaner_mutex);
Linus Torvalds01762602009-01-10 06:09:52 -08001171 return 0;
Yaned0dab62008-01-22 12:46:56 -05001172}
1173
Linus Torvalds01762602009-01-10 06:09:52 -08001174static int btrfs_unfreeze(struct super_block *sb)
Yaned0dab62008-01-22 12:46:56 -05001175{
1176 struct btrfs_root *root = btrfs_sb(sb);
Chris Masona74a4b92008-06-25 16:01:31 -04001177 mutex_unlock(&root->fs_info->cleaner_mutex);
1178 mutex_unlock(&root->fs_info->transaction_kthread_mutex);
Linus Torvalds01762602009-01-10 06:09:52 -08001179 return 0;
Yaned0dab62008-01-22 12:46:56 -05001180}
Chris Mason2e635a22007-03-21 11:12:56 -04001181
Alexey Dobriyanb87221d2009-09-21 17:01:09 -07001182static const struct super_operations btrfs_super_ops = {
Yan, Zheng76dda932009-09-21 16:00:26 -04001183 .drop_inode = btrfs_drop_inode,
Al Virobd555972010-06-07 11:35:40 -04001184 .evict_inode = btrfs_evict_inode,
Chris Masone20d96d2007-03-22 12:13:20 -04001185 .put_super = btrfs_put_super,
Chris Masond5719762007-03-23 10:01:08 -04001186 .sync_fs = btrfs_sync_fs,
Eric Parisa9572a12009-04-02 16:46:06 -04001187 .show_options = btrfs_show_options,
Chris Mason4730a4b2007-03-26 12:00:39 -04001188 .write_inode = btrfs_write_inode,
Chris Masonb5133862007-04-24 11:52:22 -04001189 .dirty_inode = btrfs_dirty_inode,
Chris Mason2c90e5d2007-04-02 10:50:19 -04001190 .alloc_inode = btrfs_alloc_inode,
1191 .destroy_inode = btrfs_destroy_inode,
Chris Mason8fd17792007-04-19 21:01:03 -04001192 .statfs = btrfs_statfs,
Yan Zhengc146afa2008-11-12 14:34:12 -05001193 .remount_fs = btrfs_remount,
Linus Torvalds01762602009-01-10 06:09:52 -08001194 .freeze_fs = btrfs_freeze,
1195 .unfreeze_fs = btrfs_unfreeze,
Chris Masone20d96d2007-03-22 12:13:20 -04001196};
Chris Masona9218f62008-03-24 15:02:04 -04001197
1198static const struct file_operations btrfs_ctl_fops = {
1199 .unlocked_ioctl = btrfs_control_ioctl,
1200 .compat_ioctl = btrfs_control_ioctl,
1201 .owner = THIS_MODULE,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001202 .llseek = noop_llseek,
Chris Masona9218f62008-03-24 15:02:04 -04001203};
1204
1205static struct miscdevice btrfs_misc = {
Kay Sievers578454f2010-05-20 18:07:20 +02001206 .minor = BTRFS_MINOR,
Chris Masona9218f62008-03-24 15:02:04 -04001207 .name = "btrfs-control",
1208 .fops = &btrfs_ctl_fops
1209};
1210
Kay Sievers578454f2010-05-20 18:07:20 +02001211MODULE_ALIAS_MISCDEV(BTRFS_MINOR);
1212MODULE_ALIAS("devname:btrfs-control");
1213
Chris Masona9218f62008-03-24 15:02:04 -04001214static int btrfs_interface_init(void)
1215{
1216 return misc_register(&btrfs_misc);
1217}
1218
Christoph Hellwigb2950862008-12-02 09:54:17 -05001219static void btrfs_interface_exit(void)
Chris Masona9218f62008-03-24 15:02:04 -04001220{
1221 if (misc_deregister(&btrfs_misc) < 0)
Chris Masond3977122009-01-05 21:25:51 -05001222 printk(KERN_INFO "misc_deregister failed for control device");
Chris Masona9218f62008-03-24 15:02:04 -04001223}
1224
Chris Mason2e635a22007-03-21 11:12:56 -04001225static int __init init_btrfs_fs(void)
1226{
Chris Mason2c90e5d2007-04-02 10:50:19 -04001227 int err;
Josef Bacik58176a92007-08-29 15:47:34 -04001228
1229 err = btrfs_init_sysfs();
1230 if (err)
1231 return err;
1232
Li Zefan261507a02010-12-17 14:21:50 +08001233 err = btrfs_init_compress();
Chris Mason2c90e5d2007-04-02 10:50:19 -04001234 if (err)
Chris Masona74a4b92008-06-25 16:01:31 -04001235 goto free_sysfs;
Chris Masond1310b22008-01-24 16:13:08 -05001236
Li Zefan261507a02010-12-17 14:21:50 +08001237 err = btrfs_init_cachep();
1238 if (err)
1239 goto free_compress;
1240
Chris Masond1310b22008-01-24 16:13:08 -05001241 err = extent_io_init();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -05001242 if (err)
1243 goto free_cachep;
1244
Chris Masond1310b22008-01-24 16:13:08 -05001245 err = extent_map_init();
1246 if (err)
1247 goto free_extent_io;
1248
Miao Xie16cdcec2011-04-22 18:12:22 +08001249 err = btrfs_delayed_inode_init();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -05001250 if (err)
1251 goto free_extent_map;
Chris Masonc8b97812008-10-29 14:49:59 -04001252
Miao Xie16cdcec2011-04-22 18:12:22 +08001253 err = btrfs_interface_init();
1254 if (err)
1255 goto free_delayed_inode;
1256
Chris Masona9218f62008-03-24 15:02:04 -04001257 err = register_filesystem(&btrfs_fs_type);
1258 if (err)
1259 goto unregister_ioctl;
Chris Masonb3c3da72008-07-23 12:12:13 -04001260
1261 printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION);
Wyatt Banks2f4cbe62007-11-19 10:22:33 -05001262 return 0;
1263
Chris Masona9218f62008-03-24 15:02:04 -04001264unregister_ioctl:
1265 btrfs_interface_exit();
Miao Xie16cdcec2011-04-22 18:12:22 +08001266free_delayed_inode:
1267 btrfs_delayed_inode_exit();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -05001268free_extent_map:
1269 extent_map_exit();
Chris Masond1310b22008-01-24 16:13:08 -05001270free_extent_io:
1271 extent_io_exit();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -05001272free_cachep:
1273 btrfs_destroy_cachep();
Li Zefan261507a02010-12-17 14:21:50 +08001274free_compress:
1275 btrfs_exit_compress();
Chris Masona74a4b92008-06-25 16:01:31 -04001276free_sysfs:
Wyatt Banks2f4cbe62007-11-19 10:22:33 -05001277 btrfs_exit_sysfs();
1278 return err;
Chris Mason2e635a22007-03-21 11:12:56 -04001279}
1280
1281static void __exit exit_btrfs_fs(void)
1282{
Chris Mason39279cc2007-06-12 06:35:45 -04001283 btrfs_destroy_cachep();
Miao Xie16cdcec2011-04-22 18:12:22 +08001284 btrfs_delayed_inode_exit();
Chris Masona52d9a82007-08-27 16:49:44 -04001285 extent_map_exit();
Chris Masond1310b22008-01-24 16:13:08 -05001286 extent_io_exit();
Chris Masona9218f62008-03-24 15:02:04 -04001287 btrfs_interface_exit();
Chris Mason2e635a22007-03-21 11:12:56 -04001288 unregister_filesystem(&btrfs_fs_type);
Josef Bacik58176a92007-08-29 15:47:34 -04001289 btrfs_exit_sysfs();
Chris Mason8a4b83c2008-03-24 15:02:07 -04001290 btrfs_cleanup_fs_uuids();
Li Zefan261507a02010-12-17 14:21:50 +08001291 btrfs_exit_compress();
Chris Mason2e635a22007-03-21 11:12:56 -04001292}
1293
1294module_init(init_btrfs_fs)
1295module_exit(exit_btrfs_fs)
1296
1297MODULE_LICENSE("GPL");