blob: 752a5463bf53aee147068c2a0a9f678e12250f38 [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>
Chris Mason4b4e25f2008-11-20 10:22:27 -050041#include "compat.h"
Chris Mason2e635a22007-03-21 11:12:56 -040042#include "ctree.h"
Chris Masone20d96d2007-03-22 12:13:20 -040043#include "disk-io.h"
Chris Masond5719762007-03-23 10:01:08 -040044#include "transaction.h"
Chris Mason2c90e5d2007-04-02 10:50:19 -040045#include "btrfs_inode.h"
Chris Masonc5739bb2007-04-10 09:27:04 -040046#include "ioctl.h"
Chris Mason3a686372007-05-24 13:35:57 -040047#include "print-tree.h"
Josef Bacik5103e942007-11-16 11:45:54 -050048#include "xattr.h"
Chris Mason8a4b83c2008-03-24 15:02:07 -040049#include "volumes.h"
Chris Masonb3c3da72008-07-23 12:12:13 -040050#include "version.h"
Balaji Raobe6e8dc2008-07-21 02:01:56 +053051#include "export.h"
Chris Masonc8b97812008-10-29 14:49:59 -040052#include "compression.h"
Chris Mason2e635a22007-03-21 11:12:56 -040053
Alexey Dobriyanb87221d2009-09-21 17:01:09 -070054static const struct super_operations btrfs_super_ops;
Chris Masone20d96d2007-03-22 12:13:20 -040055
Chris Masond3977122009-01-05 21:25:51 -050056static void btrfs_put_super(struct super_block *sb)
Chris Masone20d96d2007-03-22 12:13:20 -040057{
58 struct btrfs_root *root = btrfs_sb(sb);
59 int ret;
60
61 ret = close_ctree(root);
Chris Masone20d96d2007-03-22 12:13:20 -040062 sb->s_fs_info = NULL;
63}
Chris Mason2e635a22007-03-21 11:12:56 -040064
Chris Mason95e05282007-08-29 09:11:44 -040065enum {
Christoph Hellwig43e570b2008-06-10 10:40:46 -040066 Opt_degraded, Opt_subvol, Opt_device, Opt_nodatasum, Opt_nodatacow,
Chris Masondfe25022008-05-13 13:46:40 -040067 Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier,
Chris Mason451d7582009-06-09 20:28:34 -040068 Opt_ssd, Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl,
Christoph Hellwige244a0a2009-10-14 09:24:59 -040069 Opt_compress, Opt_notreelog, Opt_ratio, Opt_flushoncommit,
70 Opt_discard, Opt_err,
Chris Mason95e05282007-08-29 09:11:44 -040071};
72
73static match_table_t tokens = {
Chris Masondfe25022008-05-13 13:46:40 -040074 {Opt_degraded, "degraded"},
Chris Mason95e05282007-08-29 09:11:44 -040075 {Opt_subvol, "subvol=%s"},
Christoph Hellwig43e570b2008-06-10 10:40:46 -040076 {Opt_device, "device=%s"},
Chris Masonb6cda9b2007-12-14 15:30:32 -050077 {Opt_nodatasum, "nodatasum"},
Chris Masonbe20aa92007-12-17 20:14:01 -050078 {Opt_nodatacow, "nodatacow"},
Chris Mason21ad10c2008-01-09 09:23:21 -050079 {Opt_nobarrier, "nobarrier"},
Chris Masonc59f8952007-12-17 20:14:04 -050080 {Opt_max_extent, "max_extent=%s"},
Chris Mason6f568d32008-01-29 16:03:38 -050081 {Opt_max_inline, "max_inline=%s"},
Chris Mason8f662a72008-01-02 10:01:11 -050082 {Opt_alloc_start, "alloc_start=%s"},
Chris Mason4543df72008-06-11 21:47:56 -040083 {Opt_thread_pool, "thread_pool=%d"},
Chris Masonc8b97812008-10-29 14:49:59 -040084 {Opt_compress, "compress"},
Chris Masone18e4802008-01-18 10:54:22 -050085 {Opt_ssd, "ssd"},
Chris Mason451d7582009-06-09 20:28:34 -040086 {Opt_ssd_spread, "ssd_spread"},
Chris Mason3b30c222009-06-09 16:42:22 -040087 {Opt_nossd, "nossd"},
Josef Bacik33268ea2008-07-24 12:16:36 -040088 {Opt_noacl, "noacl"},
Sage Weil3a5e1402009-04-02 16:49:40 -040089 {Opt_notreelog, "notreelog"},
Sage Weildccae992009-04-02 16:59:01 -040090 {Opt_flushoncommit, "flushoncommit"},
Josef Bacik97e728d2009-04-21 17:40:57 -040091 {Opt_ratio, "metadata_ratio=%d"},
Christoph Hellwige244a0a2009-10-14 09:24:59 -040092 {Opt_discard, "discard"},
Josef Bacik33268ea2008-07-24 12:16:36 -040093 {Opt_err, NULL},
Chris Mason95e05282007-08-29 09:11:44 -040094};
95
Chris Masonedbd8d42007-12-21 16:27:24 -050096u64 btrfs_parse_size(char *str)
Chris Masonc59f8952007-12-17 20:14:04 -050097{
Chris Masonedbd8d42007-12-21 16:27:24 -050098 u64 res;
Chris Masonc59f8952007-12-17 20:14:04 -050099 int mult = 1;
100 char *end;
101 char last;
102
103 res = simple_strtoul(str, &end, 10);
104
105 last = end[0];
106 if (isalpha(last)) {
107 last = tolower(last);
108 switch (last) {
109 case 'g':
110 mult *= 1024;
111 case 'm':
112 mult *= 1024;
113 case 'k':
114 mult *= 1024;
115 }
116 res = res * mult;
117 }
118 return res;
119}
120
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400121/*
122 * Regular mount options parser. Everything that is needed only when
123 * reading in a new superblock is parsed here.
124 */
125int btrfs_parse_options(struct btrfs_root *root, char *options)
Chris Mason95e05282007-08-29 09:11:44 -0400126{
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400127 struct btrfs_fs_info *info = root->fs_info;
Chris Mason95e05282007-08-29 09:11:44 -0400128 substring_t args[MAX_OPT_ARGS];
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400129 char *p, *num;
Chris Mason4543df72008-06-11 21:47:56 -0400130 int intarg;
Chris Masonb6cda9b2007-12-14 15:30:32 -0500131
Chris Mason95e05282007-08-29 09:11:44 -0400132 if (!options)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400133 return 0;
Chris Mason95e05282007-08-29 09:11:44 -0400134
Chris Masonbe20aa92007-12-17 20:14:01 -0500135 /*
136 * strsep changes the string, duplicate it because parse_options
137 * gets called twice
138 */
139 options = kstrdup(options, GFP_NOFS);
140 if (!options)
141 return -ENOMEM;
142
Chris Masonbe20aa92007-12-17 20:14:01 -0500143
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400144 while ((p = strsep(&options, ",")) != NULL) {
Chris Mason95e05282007-08-29 09:11:44 -0400145 int token;
146 if (!*p)
147 continue;
148
149 token = match_token(p, tokens, args);
150 switch (token) {
Chris Masondfe25022008-05-13 13:46:40 -0400151 case Opt_degraded:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400152 printk(KERN_INFO "btrfs: allowing degraded mounts\n");
153 btrfs_set_opt(info->mount_opt, DEGRADED);
Chris Masondfe25022008-05-13 13:46:40 -0400154 break;
Chris Mason95e05282007-08-29 09:11:44 -0400155 case Opt_subvol:
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400156 case Opt_device:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400157 /*
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400158 * These are parsed by btrfs_parse_early_options
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400159 * and can be happily ignored here.
160 */
Chris Masonb6cda9b2007-12-14 15:30:32 -0500161 break;
162 case Opt_nodatasum:
Chris Mason067c28a2009-06-11 09:30:13 -0400163 printk(KERN_INFO "btrfs: setting nodatasum\n");
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400164 btrfs_set_opt(info->mount_opt, NODATASUM);
Chris Masonbe20aa92007-12-17 20:14:01 -0500165 break;
166 case Opt_nodatacow:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400167 printk(KERN_INFO "btrfs: setting nodatacow\n");
168 btrfs_set_opt(info->mount_opt, NODATACOW);
169 btrfs_set_opt(info->mount_opt, NODATASUM);
Chris Mason95e05282007-08-29 09:11:44 -0400170 break;
Chris Masonc8b97812008-10-29 14:49:59 -0400171 case Opt_compress:
172 printk(KERN_INFO "btrfs: use compression\n");
173 btrfs_set_opt(info->mount_opt, COMPRESS);
174 break;
Chris Masone18e4802008-01-18 10:54:22 -0500175 case Opt_ssd:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400176 printk(KERN_INFO "btrfs: use ssd allocation scheme\n");
177 btrfs_set_opt(info->mount_opt, SSD);
Chris Masone18e4802008-01-18 10:54:22 -0500178 break;
Chris Mason451d7582009-06-09 20:28:34 -0400179 case Opt_ssd_spread:
180 printk(KERN_INFO "btrfs: use spread ssd "
181 "allocation scheme\n");
182 btrfs_set_opt(info->mount_opt, SSD);
183 btrfs_set_opt(info->mount_opt, SSD_SPREAD);
184 break;
Chris Mason3b30c222009-06-09 16:42:22 -0400185 case Opt_nossd:
Chris Mason451d7582009-06-09 20:28:34 -0400186 printk(KERN_INFO "btrfs: not using ssd allocation "
187 "scheme\n");
Chris Masonc2898112009-06-10 09:51:32 -0400188 btrfs_set_opt(info->mount_opt, NOSSD);
Chris Mason3b30c222009-06-09 16:42:22 -0400189 btrfs_clear_opt(info->mount_opt, SSD);
Chris Mason451d7582009-06-09 20:28:34 -0400190 btrfs_clear_opt(info->mount_opt, SSD_SPREAD);
Chris Mason3b30c222009-06-09 16:42:22 -0400191 break;
Chris Mason21ad10c2008-01-09 09:23:21 -0500192 case Opt_nobarrier:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400193 printk(KERN_INFO "btrfs: turning off barriers\n");
194 btrfs_set_opt(info->mount_opt, NOBARRIER);
Chris Mason21ad10c2008-01-09 09:23:21 -0500195 break;
Chris Mason4543df72008-06-11 21:47:56 -0400196 case Opt_thread_pool:
197 intarg = 0;
198 match_int(&args[0], &intarg);
199 if (intarg) {
200 info->thread_pool_size = intarg;
201 printk(KERN_INFO "btrfs: thread pool %d\n",
202 info->thread_pool_size);
203 }
204 break;
Chris Masonc59f8952007-12-17 20:14:04 -0500205 case Opt_max_extent:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400206 num = match_strdup(&args[0]);
207 if (num) {
208 info->max_extent = btrfs_parse_size(num);
209 kfree(num);
Chris Masonc59f8952007-12-17 20:14:04 -0500210
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400211 info->max_extent = max_t(u64,
212 info->max_extent, root->sectorsize);
213 printk(KERN_INFO "btrfs: max_extent at %llu\n",
Joel Becker21380932009-04-21 12:38:29 -0700214 (unsigned long long)info->max_extent);
Chris Masonc59f8952007-12-17 20:14:04 -0500215 }
216 break;
Chris Mason6f568d32008-01-29 16:03:38 -0500217 case Opt_max_inline:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400218 num = match_strdup(&args[0]);
219 if (num) {
220 info->max_inline = btrfs_parse_size(num);
221 kfree(num);
Chris Mason6f568d32008-01-29 16:03:38 -0500222
Chris Mason15ada042008-06-11 16:51:38 -0400223 if (info->max_inline) {
224 info->max_inline = max_t(u64,
225 info->max_inline,
226 root->sectorsize);
227 }
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400228 printk(KERN_INFO "btrfs: max_inline at %llu\n",
Joel Becker21380932009-04-21 12:38:29 -0700229 (unsigned long long)info->max_inline);
Chris Mason6f568d32008-01-29 16:03:38 -0500230 }
231 break;
Chris Mason8f662a72008-01-02 10:01:11 -0500232 case Opt_alloc_start:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400233 num = match_strdup(&args[0]);
234 if (num) {
235 info->alloc_start = btrfs_parse_size(num);
236 kfree(num);
237 printk(KERN_INFO
238 "btrfs: allocations start at %llu\n",
Joel Becker21380932009-04-21 12:38:29 -0700239 (unsigned long long)info->alloc_start);
Chris Mason8f662a72008-01-02 10:01:11 -0500240 }
241 break;
Josef Bacik33268ea2008-07-24 12:16:36 -0400242 case Opt_noacl:
243 root->fs_info->sb->s_flags &= ~MS_POSIXACL;
244 break;
Sage Weil3a5e1402009-04-02 16:49:40 -0400245 case Opt_notreelog:
246 printk(KERN_INFO "btrfs: disabling tree log\n");
247 btrfs_set_opt(info->mount_opt, NOTREELOG);
248 break;
Sage Weildccae992009-04-02 16:59:01 -0400249 case Opt_flushoncommit:
250 printk(KERN_INFO "btrfs: turning on flush-on-commit\n");
251 btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT);
252 break;
Josef Bacik97e728d2009-04-21 17:40:57 -0400253 case Opt_ratio:
254 intarg = 0;
255 match_int(&args[0], &intarg);
256 if (intarg) {
257 info->metadata_ratio = intarg;
258 printk(KERN_INFO "btrfs: metadata ratio %d\n",
259 info->metadata_ratio);
260 }
261 break;
Christoph Hellwige244a0a2009-10-14 09:24:59 -0400262 case Opt_discard:
263 btrfs_set_opt(info->mount_opt, DISCARD);
264 break;
Chris Mason95e05282007-08-29 09:11:44 -0400265 default:
Chris Masonbe20aa92007-12-17 20:14:01 -0500266 break;
Chris Mason95e05282007-08-29 09:11:44 -0400267 }
268 }
Chris Masonbe20aa92007-12-17 20:14:01 -0500269 kfree(options);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400270 return 0;
271}
272
273/*
274 * Parse mount options that are required early in the mount process.
275 *
276 * All other options will be parsed on much later in the mount process and
277 * only when we need to allocate a new super block.
278 */
Christoph Hellwig97288f22008-12-02 06:36:09 -0500279static int btrfs_parse_early_options(const char *options, fmode_t flags,
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400280 void *holder, char **subvol_name,
281 struct btrfs_fs_devices **fs_devices)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400282{
283 substring_t args[MAX_OPT_ARGS];
284 char *opts, *p;
285 int error = 0;
286
287 if (!options)
288 goto out;
289
290 /*
291 * strsep changes the string, duplicate it because parse_options
292 * gets called twice
293 */
294 opts = kstrdup(options, GFP_KERNEL);
295 if (!opts)
296 return -ENOMEM;
297
298 while ((p = strsep(&opts, ",")) != NULL) {
299 int token;
300 if (!*p)
301 continue;
302
303 token = match_token(p, tokens, args);
304 switch (token) {
305 case Opt_subvol:
306 *subvol_name = match_strdup(&args[0]);
307 break;
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400308 case Opt_device:
309 error = btrfs_scan_one_device(match_strdup(&args[0]),
310 flags, holder, fs_devices);
311 if (error)
312 goto out_free_opts;
313 break;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400314 default:
315 break;
316 }
317 }
318
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400319 out_free_opts:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400320 kfree(opts);
321 out:
322 /*
323 * If no subvolume name is specified we use the default one. Allocate
Chris Mason3de45862008-11-17 21:02:50 -0500324 * a copy of the string "." here so that code later in the
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400325 * mount path doesn't care if it's the default volume or another one.
326 */
327 if (!*subvol_name) {
Chris Mason3de45862008-11-17 21:02:50 -0500328 *subvol_name = kstrdup(".", GFP_KERNEL);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400329 if (!*subvol_name)
330 return -ENOMEM;
331 }
332 return error;
Chris Mason95e05282007-08-29 09:11:44 -0400333}
334
Chris Masond3977122009-01-05 21:25:51 -0500335static int btrfs_fill_super(struct super_block *sb,
Chris Mason8a4b83c2008-03-24 15:02:07 -0400336 struct btrfs_fs_devices *fs_devices,
Chris Masond3977122009-01-05 21:25:51 -0500337 void *data, int silent)
Chris Mason2e635a22007-03-21 11:12:56 -0400338{
Chris Masond3977122009-01-05 21:25:51 -0500339 struct inode *inode;
340 struct dentry *root_dentry;
Chris Masone20d96d2007-03-22 12:13:20 -0400341 struct btrfs_super_block *disk_super;
Chris Mason0f7d52f2007-04-09 10:42:37 -0400342 struct btrfs_root *tree_root;
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400343 struct btrfs_key key;
Chris Mason39279cc2007-06-12 06:35:45 -0400344 int err;
Chris Mason2e635a22007-03-21 11:12:56 -0400345
346 sb->s_maxbytes = MAX_LFS_FILESIZE;
Chris Mason2e635a22007-03-21 11:12:56 -0400347 sb->s_magic = BTRFS_SUPER_MAGIC;
Chris Masone20d96d2007-03-22 12:13:20 -0400348 sb->s_op = &btrfs_super_ops;
Balaji Raobe6e8dc2008-07-21 02:01:56 +0530349 sb->s_export_op = &btrfs_export_ops;
Josef Bacik5103e942007-11-16 11:45:54 -0500350 sb->s_xattr = btrfs_xattr_handlers;
Chris Mason2e635a22007-03-21 11:12:56 -0400351 sb->s_time_gran = 1;
Chris Mason0eda2942009-10-13 13:50:18 -0400352#ifdef CONFIG_BTRFS_FS_POSIX_ACL
Josef Bacik33268ea2008-07-24 12:16:36 -0400353 sb->s_flags |= MS_POSIXACL;
Chris Ball49cf6f42009-09-29 13:51:04 -0400354#endif
Chris Masone20d96d2007-03-22 12:13:20 -0400355
Chris Masondfe25022008-05-13 13:46:40 -0400356 tree_root = open_ctree(sb, fs_devices, (char *)data);
Chris Masond98237b2007-03-28 13:57:48 -0400357
Yane58ca022008-04-01 11:21:34 -0400358 if (IS_ERR(tree_root)) {
Chris Masone20d96d2007-03-22 12:13:20 -0400359 printk("btrfs: open_ctree failed\n");
Yane58ca022008-04-01 11:21:34 -0400360 return PTR_ERR(tree_root);
Chris Masone20d96d2007-03-22 12:13:20 -0400361 }
Chris Mason0f7d52f2007-04-09 10:42:37 -0400362 sb->s_fs_info = tree_root;
Chris Mason5f39d392007-10-15 16:14:19 -0400363 disk_super = &tree_root->fs_info->super_copy;
Chris Masonb888db22007-08-27 16:49:44 -0400364
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400365 key.objectid = BTRFS_FIRST_FREE_OBJECTID;
366 key.type = BTRFS_INODE_ITEM_KEY;
367 key.offset = 0;
368 inode = btrfs_iget(sb, &key, tree_root->fs_info->fs_root);
369 if (IS_ERR(inode)) {
370 err = PTR_ERR(inode);
Chris Mason39279cc2007-06-12 06:35:45 -0400371 goto fail_close;
372 }
Chris Mason2e635a22007-03-21 11:12:56 -0400373
Chris Masone20d96d2007-03-22 12:13:20 -0400374 root_dentry = d_alloc_root(inode);
375 if (!root_dentry) {
Chris Mason2e635a22007-03-21 11:12:56 -0400376 iput(inode);
Chris Mason39279cc2007-06-12 06:35:45 -0400377 err = -ENOMEM;
378 goto fail_close;
Chris Mason2e635a22007-03-21 11:12:56 -0400379 }
Yan Zhenge4404d62008-12-12 10:03:26 -0500380#if 0
Josef Bacik58176a92007-08-29 15:47:34 -0400381 /* this does the super kobj at the same time */
382 err = btrfs_sysfs_add_super(tree_root->fs_info);
383 if (err)
384 goto fail_close;
Yan Zhenge4404d62008-12-12 10:03:26 -0500385#endif
Josef Bacik58176a92007-08-29 15:47:34 -0400386
Chris Masone20d96d2007-03-22 12:13:20 -0400387 sb->s_root = root_dentry;
Chris Mason6885f302008-02-20 16:11:05 -0500388
Chris Mason6885f302008-02-20 16:11:05 -0500389 save_mount_options(sb, data);
Chris Mason2e635a22007-03-21 11:12:56 -0400390 return 0;
Chris Mason2e635a22007-03-21 11:12:56 -0400391
Chris Mason39279cc2007-06-12 06:35:45 -0400392fail_close:
393 close_ctree(tree_root);
Chris Masond5719762007-03-23 10:01:08 -0400394 return err;
395}
396
Sage Weil6bf13c02008-06-10 10:07:39 -0400397int btrfs_sync_fs(struct super_block *sb, int wait)
Chris Masond5719762007-03-23 10:01:08 -0400398{
399 struct btrfs_trans_handle *trans;
Sage Weildccae992009-04-02 16:59:01 -0400400 struct btrfs_root *root = btrfs_sb(sb);
Chris Masond5719762007-03-23 10:01:08 -0400401 int ret;
Chris Masondf2ce342007-03-23 11:00:45 -0400402
Chris Masond561c022007-03-23 19:47:49 -0400403 if (!wait) {
Chris Mason7cfcc172007-04-02 14:53:59 -0400404 filemap_flush(root->fs_info->btree_inode->i_mapping);
Chris Masond561c022007-03-23 19:47:49 -0400405 return 0;
406 }
Chris Mason771ed682008-11-06 22:02:51 -0500407
408 btrfs_start_delalloc_inodes(root);
409 btrfs_wait_ordered_extents(root, 0);
410
Chris Masond5719762007-03-23 10:01:08 -0400411 trans = btrfs_start_transaction(root, 1);
412 ret = btrfs_commit_transaction(trans, root);
Chris Mason54aa1f42007-06-22 14:16:25 -0400413 return ret;
Chris Masond5719762007-03-23 10:01:08 -0400414}
415
Eric Parisa9572a12009-04-02 16:46:06 -0400416static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
417{
418 struct btrfs_root *root = btrfs_sb(vfs->mnt_sb);
419 struct btrfs_fs_info *info = root->fs_info;
420
421 if (btrfs_test_opt(root, DEGRADED))
422 seq_puts(seq, ",degraded");
423 if (btrfs_test_opt(root, NODATASUM))
424 seq_puts(seq, ",nodatasum");
425 if (btrfs_test_opt(root, NODATACOW))
426 seq_puts(seq, ",nodatacow");
427 if (btrfs_test_opt(root, NOBARRIER))
428 seq_puts(seq, ",nobarrier");
429 if (info->max_extent != (u64)-1)
Joel Becker21380932009-04-21 12:38:29 -0700430 seq_printf(seq, ",max_extent=%llu",
431 (unsigned long long)info->max_extent);
Eric Parisa9572a12009-04-02 16:46:06 -0400432 if (info->max_inline != 8192 * 1024)
Joel Becker21380932009-04-21 12:38:29 -0700433 seq_printf(seq, ",max_inline=%llu",
434 (unsigned long long)info->max_inline);
Eric Parisa9572a12009-04-02 16:46:06 -0400435 if (info->alloc_start != 0)
Joel Becker21380932009-04-21 12:38:29 -0700436 seq_printf(seq, ",alloc_start=%llu",
437 (unsigned long long)info->alloc_start);
Eric Parisa9572a12009-04-02 16:46:06 -0400438 if (info->thread_pool_size != min_t(unsigned long,
439 num_online_cpus() + 2, 8))
440 seq_printf(seq, ",thread_pool=%d", info->thread_pool_size);
441 if (btrfs_test_opt(root, COMPRESS))
442 seq_puts(seq, ",compress");
Chris Masonc2898112009-06-10 09:51:32 -0400443 if (btrfs_test_opt(root, NOSSD))
444 seq_puts(seq, ",nossd");
Chris Mason451d7582009-06-09 20:28:34 -0400445 if (btrfs_test_opt(root, SSD_SPREAD))
446 seq_puts(seq, ",ssd_spread");
447 else if (btrfs_test_opt(root, SSD))
Eric Parisa9572a12009-04-02 16:46:06 -0400448 seq_puts(seq, ",ssd");
Sage Weil3a5e1402009-04-02 16:49:40 -0400449 if (btrfs_test_opt(root, NOTREELOG))
Sage Weil6b65c5c2009-05-14 13:52:21 -0400450 seq_puts(seq, ",notreelog");
Sage Weildccae992009-04-02 16:59:01 -0400451 if (btrfs_test_opt(root, FLUSHONCOMMIT))
Sage Weil6b65c5c2009-05-14 13:52:21 -0400452 seq_puts(seq, ",flushoncommit");
Eric Parisa9572a12009-04-02 16:46:06 -0400453 if (!(root->fs_info->sb->s_flags & MS_POSIXACL))
454 seq_puts(seq, ",noacl");
455 return 0;
456}
457
Chris Masona061fc82008-05-07 11:43:44 -0400458static int btrfs_test_super(struct super_block *s, void *data)
Chris Mason2e635a22007-03-21 11:12:56 -0400459{
Chris Masona061fc82008-05-07 11:43:44 -0400460 struct btrfs_fs_devices *test_fs_devices = data;
461 struct btrfs_root *root = btrfs_sb(s);
Yan4b82d6e2007-08-29 09:11:44 -0400462
Chris Masona061fc82008-05-07 11:43:44 -0400463 return root->fs_info->fs_devices == test_fs_devices;
Yan4b82d6e2007-08-29 09:11:44 -0400464}
465
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400466/*
467 * Find a superblock for the given device / mount point.
468 *
469 * Note: This is based on get_sb_bdev from fs/super.c with a few additions
470 * for multiple device setup. Make sure to keep it in sync.
471 */
472static int btrfs_get_sb(struct file_system_type *fs_type, int flags,
473 const char *dev_name, void *data, struct vfsmount *mnt)
Yan4b82d6e2007-08-29 09:11:44 -0400474{
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400475 char *subvol_name = NULL;
Yan4b82d6e2007-08-29 09:11:44 -0400476 struct block_device *bdev = NULL;
477 struct super_block *s;
478 struct dentry *root;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400479 struct btrfs_fs_devices *fs_devices = NULL;
Christoph Hellwig97288f22008-12-02 06:36:09 -0500480 fmode_t mode = FMODE_READ;
Yan4b82d6e2007-08-29 09:11:44 -0400481 int error = 0;
482
Christoph Hellwig97288f22008-12-02 06:36:09 -0500483 if (!(flags & MS_RDONLY))
484 mode |= FMODE_WRITE;
485
486 error = btrfs_parse_early_options(data, mode, fs_type,
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400487 &subvol_name, &fs_devices);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400488 if (error)
Shen Feng1f483662009-01-05 15:43:42 -0500489 return error;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400490
Christoph Hellwig97288f22008-12-02 06:36:09 -0500491 error = btrfs_scan_one_device(dev_name, mode, fs_type, &fs_devices);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400492 if (error)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400493 goto error_free_subvol_name;
Yan4b82d6e2007-08-29 09:11:44 -0400494
Christoph Hellwig97288f22008-12-02 06:36:09 -0500495 error = btrfs_open_devices(fs_devices, mode, fs_type);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400496 if (error)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400497 goto error_free_subvol_name;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400498
Yan Zheng2b820322008-11-17 21:11:30 -0500499 if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) {
500 error = -EACCES;
501 goto error_close_devices;
502 }
503
Chris Masondfe25022008-05-13 13:46:40 -0400504 bdev = fs_devices->latest_bdev;
Chris Masona061fc82008-05-07 11:43:44 -0400505 s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices);
Yan4b82d6e2007-08-29 09:11:44 -0400506 if (IS_ERR(s))
507 goto error_s;
508
509 if (s->s_root) {
510 if ((flags ^ s->s_flags) & MS_RDONLY) {
Al Viro6f5bbff2009-05-06 01:34:22 -0400511 deactivate_locked_super(s);
Yan4b82d6e2007-08-29 09:11:44 -0400512 error = -EBUSY;
Yan Zhengc146afa2008-11-12 14:34:12 -0500513 goto error_close_devices;
Yan4b82d6e2007-08-29 09:11:44 -0400514 }
515
Yan Zheng2b820322008-11-17 21:11:30 -0500516 btrfs_close_devices(fs_devices);
Yan4b82d6e2007-08-29 09:11:44 -0400517 } else {
518 char b[BDEVNAME_SIZE];
519
520 s->s_flags = flags;
521 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
Chris Mason8a4b83c2008-03-24 15:02:07 -0400522 error = btrfs_fill_super(s, fs_devices, data,
523 flags & MS_SILENT ? 1 : 0);
Yan4b82d6e2007-08-29 09:11:44 -0400524 if (error) {
Al Viro6f5bbff2009-05-06 01:34:22 -0400525 deactivate_locked_super(s);
Shen Feng1f483662009-01-05 15:43:42 -0500526 goto error_free_subvol_name;
Yan4b82d6e2007-08-29 09:11:44 -0400527 }
528
Chris Mason788f20e2008-04-28 15:29:42 -0400529 btrfs_sb(s)->fs_info->bdev_holder = fs_type;
Yan4b82d6e2007-08-29 09:11:44 -0400530 s->s_flags |= MS_ACTIVE;
531 }
532
David Woodhouse76fcef12008-08-19 16:49:35 +0100533 if (!strcmp(subvol_name, "."))
534 root = dget(s->s_root);
535 else {
536 mutex_lock(&s->s_root->d_inode->i_mutex);
Chris Masond3977122009-01-05 21:25:51 -0500537 root = lookup_one_len(subvol_name, s->s_root,
538 strlen(subvol_name));
David Woodhouse76fcef12008-08-19 16:49:35 +0100539 mutex_unlock(&s->s_root->d_inode->i_mutex);
Chris Masond3977122009-01-05 21:25:51 -0500540
David Woodhouse76fcef12008-08-19 16:49:35 +0100541 if (IS_ERR(root)) {
Al Viro6f5bbff2009-05-06 01:34:22 -0400542 deactivate_locked_super(s);
David Woodhouse76fcef12008-08-19 16:49:35 +0100543 error = PTR_ERR(root);
Shen Feng1f483662009-01-05 15:43:42 -0500544 goto error_free_subvol_name;
David Woodhouse76fcef12008-08-19 16:49:35 +0100545 }
546 if (!root->d_inode) {
547 dput(root);
Al Viro6f5bbff2009-05-06 01:34:22 -0400548 deactivate_locked_super(s);
David Woodhouse76fcef12008-08-19 16:49:35 +0100549 error = -ENXIO;
Shen Feng1f483662009-01-05 15:43:42 -0500550 goto error_free_subvol_name;
David Woodhouse76fcef12008-08-19 16:49:35 +0100551 }
Yan4b82d6e2007-08-29 09:11:44 -0400552 }
553
554 mnt->mnt_sb = s;
555 mnt->mnt_root = root;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400556
557 kfree(subvol_name);
Yan4b82d6e2007-08-29 09:11:44 -0400558 return 0;
559
560error_s:
561 error = PTR_ERR(s);
Yan Zhengc146afa2008-11-12 14:34:12 -0500562error_close_devices:
Chris Mason8a4b83c2008-03-24 15:02:07 -0400563 btrfs_close_devices(fs_devices);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400564error_free_subvol_name:
565 kfree(subvol_name);
Yan4b82d6e2007-08-29 09:11:44 -0400566 return error;
567}
Chris Mason2e635a22007-03-21 11:12:56 -0400568
Yan Zhengc146afa2008-11-12 14:34:12 -0500569static int btrfs_remount(struct super_block *sb, int *flags, char *data)
570{
571 struct btrfs_root *root = btrfs_sb(sb);
572 int ret;
573
Chris Masonb2880522009-02-12 09:37:35 -0500574 ret = btrfs_parse_options(root, data);
575 if (ret)
576 return -EINVAL;
577
Yan Zhengc146afa2008-11-12 14:34:12 -0500578 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
579 return 0;
580
581 if (*flags & MS_RDONLY) {
582 sb->s_flags |= MS_RDONLY;
583
584 ret = btrfs_commit_super(root);
585 WARN_ON(ret);
586 } else {
Yan Zheng2b820322008-11-17 21:11:30 -0500587 if (root->fs_info->fs_devices->rw_devices == 0)
588 return -EACCES;
589
Yan Zhengc146afa2008-11-12 14:34:12 -0500590 if (btrfs_super_log_root(&root->fs_info->super_copy) != 0)
591 return -EINVAL;
592
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400593 /* recover relocation */
594 ret = btrfs_recover_relocation(root);
Yan Zhengc146afa2008-11-12 14:34:12 -0500595 WARN_ON(ret);
596
597 ret = btrfs_cleanup_fs_roots(root->fs_info);
598 WARN_ON(ret);
599
600 sb->s_flags &= ~MS_RDONLY;
601 }
602
603 return 0;
604}
605
Chris Mason8fd17792007-04-19 21:01:03 -0400606static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
607{
608 struct btrfs_root *root = btrfs_sb(dentry->d_sb);
Chris Mason4b52dff2007-06-26 10:06:50 -0400609 struct btrfs_super_block *disk_super = &root->fs_info->super_copy;
Chris Masondb945352007-10-15 16:15:53 -0400610 int bits = dentry->d_sb->s_blocksize_bits;
David Woodhouse9d036322008-08-18 12:01:52 +0100611 __be32 *fsid = (__be32 *)root->fs_info->fsid;
Chris Mason8fd17792007-04-19 21:01:03 -0400612
613 buf->f_namelen = BTRFS_NAME_LEN;
Chris Masondb945352007-10-15 16:15:53 -0400614 buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits;
615 buf->f_bfree = buf->f_blocks -
616 (btrfs_super_bytes_used(disk_super) >> bits);
Chris Mason8fd17792007-04-19 21:01:03 -0400617 buf->f_bavail = buf->f_bfree;
618 buf->f_bsize = dentry->d_sb->s_blocksize;
619 buf->f_type = BTRFS_SUPER_MAGIC;
Chris Masond3977122009-01-05 21:25:51 -0500620
David Woodhouse9d036322008-08-18 12:01:52 +0100621 /* We treat it as constant endianness (it doesn't matter _which_)
Chris Masond3977122009-01-05 21:25:51 -0500622 because we want the fsid to come out the same whether mounted
David Woodhouse9d036322008-08-18 12:01:52 +0100623 on a big-endian or little-endian host */
624 buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]);
625 buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]);
David Woodhouse32d48fa2008-08-18 13:10:20 +0100626 /* Mask in the root object ID too, to disambiguate subvols */
627 buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32;
628 buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid;
629
Chris Mason8fd17792007-04-19 21:01:03 -0400630 return 0;
631}
Chris Masonb5133862007-04-24 11:52:22 -0400632
Chris Mason2e635a22007-03-21 11:12:56 -0400633static struct file_system_type btrfs_fs_type = {
634 .owner = THIS_MODULE,
635 .name = "btrfs",
636 .get_sb = btrfs_get_sb,
Chris Masona061fc82008-05-07 11:43:44 -0400637 .kill_sb = kill_anon_super,
Chris Mason2e635a22007-03-21 11:12:56 -0400638 .fs_flags = FS_REQUIRES_DEV,
639};
Chris Masona9218f62008-03-24 15:02:04 -0400640
Chris Masond352ac62008-09-29 15:18:18 -0400641/*
642 * used by btrfsctl to scan devices when no FS is mounted
643 */
Chris Mason8a4b83c2008-03-24 15:02:07 -0400644static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
645 unsigned long arg)
646{
647 struct btrfs_ioctl_vol_args *vol;
648 struct btrfs_fs_devices *fs_devices;
Chris Masonc071fcf2009-01-16 11:59:08 -0500649 int ret = -ENOTTY;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400650
Chris Masone441d542009-01-05 16:57:23 -0500651 if (!capable(CAP_SYS_ADMIN))
652 return -EPERM;
653
Li Zefandae7b662009-04-08 15:06:54 +0800654 vol = memdup_user((void __user *)arg, sizeof(*vol));
655 if (IS_ERR(vol))
656 return PTR_ERR(vol);
Chris Masonc071fcf2009-01-16 11:59:08 -0500657
Chris Mason8a4b83c2008-03-24 15:02:07 -0400658 switch (cmd) {
659 case BTRFS_IOC_SCAN_DEV:
Christoph Hellwig97288f22008-12-02 06:36:09 -0500660 ret = btrfs_scan_one_device(vol->name, FMODE_READ,
Chris Mason8a4b83c2008-03-24 15:02:07 -0400661 &btrfs_fs_type, &fs_devices);
662 break;
663 }
Li Zefandae7b662009-04-08 15:06:54 +0800664
Chris Mason8a4b83c2008-03-24 15:02:07 -0400665 kfree(vol);
Linda Knippersf819d832008-06-09 22:17:11 -0400666 return ret;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400667}
668
Linus Torvalds01762602009-01-10 06:09:52 -0800669static int btrfs_freeze(struct super_block *sb)
Yaned0dab62008-01-22 12:46:56 -0500670{
671 struct btrfs_root *root = btrfs_sb(sb);
Chris Masona74a4b92008-06-25 16:01:31 -0400672 mutex_lock(&root->fs_info->transaction_kthread_mutex);
673 mutex_lock(&root->fs_info->cleaner_mutex);
Linus Torvalds01762602009-01-10 06:09:52 -0800674 return 0;
Yaned0dab62008-01-22 12:46:56 -0500675}
676
Linus Torvalds01762602009-01-10 06:09:52 -0800677static int btrfs_unfreeze(struct super_block *sb)
Yaned0dab62008-01-22 12:46:56 -0500678{
679 struct btrfs_root *root = btrfs_sb(sb);
Chris Masona74a4b92008-06-25 16:01:31 -0400680 mutex_unlock(&root->fs_info->cleaner_mutex);
681 mutex_unlock(&root->fs_info->transaction_kthread_mutex);
Linus Torvalds01762602009-01-10 06:09:52 -0800682 return 0;
Yaned0dab62008-01-22 12:46:56 -0500683}
Chris Mason2e635a22007-03-21 11:12:56 -0400684
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700685static const struct super_operations btrfs_super_ops = {
Yan, Zheng76dda932009-09-21 16:00:26 -0400686 .drop_inode = btrfs_drop_inode,
Chris Mason134e9732007-03-25 13:44:56 -0400687 .delete_inode = btrfs_delete_inode,
Chris Masone20d96d2007-03-22 12:13:20 -0400688 .put_super = btrfs_put_super,
Chris Masond5719762007-03-23 10:01:08 -0400689 .sync_fs = btrfs_sync_fs,
Eric Parisa9572a12009-04-02 16:46:06 -0400690 .show_options = btrfs_show_options,
Chris Mason4730a4b2007-03-26 12:00:39 -0400691 .write_inode = btrfs_write_inode,
Chris Masonb5133862007-04-24 11:52:22 -0400692 .dirty_inode = btrfs_dirty_inode,
Chris Mason2c90e5d2007-04-02 10:50:19 -0400693 .alloc_inode = btrfs_alloc_inode,
694 .destroy_inode = btrfs_destroy_inode,
Chris Mason8fd17792007-04-19 21:01:03 -0400695 .statfs = btrfs_statfs,
Yan Zhengc146afa2008-11-12 14:34:12 -0500696 .remount_fs = btrfs_remount,
Linus Torvalds01762602009-01-10 06:09:52 -0800697 .freeze_fs = btrfs_freeze,
698 .unfreeze_fs = btrfs_unfreeze,
Chris Masone20d96d2007-03-22 12:13:20 -0400699};
Chris Masona9218f62008-03-24 15:02:04 -0400700
701static const struct file_operations btrfs_ctl_fops = {
702 .unlocked_ioctl = btrfs_control_ioctl,
703 .compat_ioctl = btrfs_control_ioctl,
704 .owner = THIS_MODULE,
705};
706
707static struct miscdevice btrfs_misc = {
708 .minor = MISC_DYNAMIC_MINOR,
709 .name = "btrfs-control",
710 .fops = &btrfs_ctl_fops
711};
712
713static int btrfs_interface_init(void)
714{
715 return misc_register(&btrfs_misc);
716}
717
Christoph Hellwigb2950862008-12-02 09:54:17 -0500718static void btrfs_interface_exit(void)
Chris Masona9218f62008-03-24 15:02:04 -0400719{
720 if (misc_deregister(&btrfs_misc) < 0)
Chris Masond3977122009-01-05 21:25:51 -0500721 printk(KERN_INFO "misc_deregister failed for control device");
Chris Masona9218f62008-03-24 15:02:04 -0400722}
723
Chris Mason2e635a22007-03-21 11:12:56 -0400724static int __init init_btrfs_fs(void)
725{
Chris Mason2c90e5d2007-04-02 10:50:19 -0400726 int err;
Josef Bacik58176a92007-08-29 15:47:34 -0400727
728 err = btrfs_init_sysfs();
729 if (err)
730 return err;
731
Chris Mason39279cc2007-06-12 06:35:45 -0400732 err = btrfs_init_cachep();
Chris Mason2c90e5d2007-04-02 10:50:19 -0400733 if (err)
Chris Masona74a4b92008-06-25 16:01:31 -0400734 goto free_sysfs;
Chris Masond1310b22008-01-24 16:13:08 -0500735
736 err = extent_io_init();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500737 if (err)
738 goto free_cachep;
739
Chris Masond1310b22008-01-24 16:13:08 -0500740 err = extent_map_init();
741 if (err)
742 goto free_extent_io;
743
Chris Masona9218f62008-03-24 15:02:04 -0400744 err = btrfs_interface_init();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500745 if (err)
746 goto free_extent_map;
Chris Masonc8b97812008-10-29 14:49:59 -0400747
Chris Masona9218f62008-03-24 15:02:04 -0400748 err = register_filesystem(&btrfs_fs_type);
749 if (err)
750 goto unregister_ioctl;
Chris Masonb3c3da72008-07-23 12:12:13 -0400751
752 printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION);
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500753 return 0;
754
Chris Masona9218f62008-03-24 15:02:04 -0400755unregister_ioctl:
756 btrfs_interface_exit();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500757free_extent_map:
758 extent_map_exit();
Chris Masond1310b22008-01-24 16:13:08 -0500759free_extent_io:
760 extent_io_exit();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500761free_cachep:
762 btrfs_destroy_cachep();
Chris Masona74a4b92008-06-25 16:01:31 -0400763free_sysfs:
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500764 btrfs_exit_sysfs();
765 return err;
Chris Mason2e635a22007-03-21 11:12:56 -0400766}
767
768static void __exit exit_btrfs_fs(void)
769{
Chris Mason39279cc2007-06-12 06:35:45 -0400770 btrfs_destroy_cachep();
Chris Masona52d9a82007-08-27 16:49:44 -0400771 extent_map_exit();
Chris Masond1310b22008-01-24 16:13:08 -0500772 extent_io_exit();
Chris Masona9218f62008-03-24 15:02:04 -0400773 btrfs_interface_exit();
Chris Mason2e635a22007-03-21 11:12:56 -0400774 unregister_filesystem(&btrfs_fs_type);
Josef Bacik58176a92007-08-29 15:47:34 -0400775 btrfs_exit_sysfs();
Chris Mason8a4b83c2008-03-24 15:02:07 -0400776 btrfs_cleanup_fs_uuids();
Chris Masonc8b97812008-10-29 14:49:59 -0400777 btrfs_zlib_exit();
Chris Mason2e635a22007-03-21 11:12:56 -0400778}
779
780module_init(init_btrfs_fs)
781module_exit(exit_btrfs_fs)
782
783MODULE_LICENSE("GPL");