blob: 9f179d4832d5c90e6270c732628b4e1998a28013 [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>
29#include <linux/smp_lock.h>
30#include <linux/backing-dev.h>
Yan4b82d6e2007-08-29 09:11:44 -040031#include <linux/mount.h>
Chris Masondee26a92007-03-26 16:00:06 -040032#include <linux/mpage.h>
Chris Mason75dfe392007-03-29 11:56:46 -040033#include <linux/swap.h>
34#include <linux/writeback.h>
Chris Mason8fd17792007-04-19 21:01:03 -040035#include <linux/statfs.h>
Chris Mason08607c12007-06-08 15:33:54 -040036#include <linux/compat.h>
Chris Mason95e05282007-08-29 09:11:44 -040037#include <linux/parser.h>
Chris Masonc59f8952007-12-17 20:14:04 -050038#include <linux/ctype.h>
Chris Mason6da6aba2007-12-18 16:15:09 -050039#include <linux/namei.h>
Chris Masona9218f62008-03-24 15:02:04 -040040#include <linux/miscdevice.h>
Qinghuang Feng1bcbf312009-01-15 13:51:03 -080041#include <linux/magic.h>
Chris Mason4b4e25f2008-11-20 10:22:27 -050042#include "compat.h"
Chris Mason2e635a22007-03-21 11:12:56 -040043#include "ctree.h"
Chris Masone20d96d2007-03-22 12:13:20 -040044#include "disk-io.h"
Chris Masond5719762007-03-23 10:01:08 -040045#include "transaction.h"
Chris Mason2c90e5d2007-04-02 10:50:19 -040046#include "btrfs_inode.h"
Chris Masonc5739bb2007-04-10 09:27:04 -040047#include "ioctl.h"
Chris Mason3a686372007-05-24 13:35:57 -040048#include "print-tree.h"
Josef Bacik5103e942007-11-16 11:45:54 -050049#include "xattr.h"
Chris Mason8a4b83c2008-03-24 15:02:07 -040050#include "volumes.h"
Chris Masonb3c3da72008-07-23 12:12:13 -040051#include "version.h"
Balaji Raobe6e8dc2008-07-21 02:01:56 +053052#include "export.h"
Chris Masonc8b97812008-10-29 14:49:59 -040053#include "compression.h"
Chris Mason2e635a22007-03-21 11:12:56 -040054
Chris Masone20d96d2007-03-22 12:13:20 -040055static struct super_operations btrfs_super_ops;
Chris Masone20d96d2007-03-22 12:13:20 -040056
Chris Masond3977122009-01-05 21:25:51 -050057static void btrfs_put_super(struct super_block *sb)
Chris Masone20d96d2007-03-22 12:13:20 -040058{
59 struct btrfs_root *root = btrfs_sb(sb);
60 int ret;
61
62 ret = close_ctree(root);
Chris Masone20d96d2007-03-22 12:13:20 -040063 sb->s_fs_info = NULL;
64}
Chris Mason2e635a22007-03-21 11:12:56 -040065
Chris Mason95e05282007-08-29 09:11:44 -040066enum {
Christoph Hellwig43e570b2008-06-10 10:40:46 -040067 Opt_degraded, Opt_subvol, Opt_device, Opt_nodatasum, Opt_nodatacow,
Chris Masondfe25022008-05-13 13:46:40 -040068 Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier,
Chris Mason451d7582009-06-09 20:28:34 -040069 Opt_ssd, Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl,
70 Opt_compress, Opt_notreelog, Opt_ratio, Opt_flushoncommit, 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"},
Josef Bacik33268ea2008-07-24 12:16:36 -040092 {Opt_err, NULL},
Chris Mason95e05282007-08-29 09:11:44 -040093};
94
Chris Masonedbd8d42007-12-21 16:27:24 -050095u64 btrfs_parse_size(char *str)
Chris Masonc59f8952007-12-17 20:14:04 -050096{
Chris Masonedbd8d42007-12-21 16:27:24 -050097 u64 res;
Chris Masonc59f8952007-12-17 20:14:04 -050098 int mult = 1;
99 char *end;
100 char last;
101
102 res = simple_strtoul(str, &end, 10);
103
104 last = end[0];
105 if (isalpha(last)) {
106 last = tolower(last);
107 switch (last) {
108 case 'g':
109 mult *= 1024;
110 case 'm':
111 mult *= 1024;
112 case 'k':
113 mult *= 1024;
114 }
115 res = res * mult;
116 }
117 return res;
118}
119
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400120/*
121 * Regular mount options parser. Everything that is needed only when
122 * reading in a new superblock is parsed here.
123 */
124int btrfs_parse_options(struct btrfs_root *root, char *options)
Chris Mason95e05282007-08-29 09:11:44 -0400125{
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400126 struct btrfs_fs_info *info = root->fs_info;
Chris Mason95e05282007-08-29 09:11:44 -0400127 substring_t args[MAX_OPT_ARGS];
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400128 char *p, *num;
Chris Mason4543df72008-06-11 21:47:56 -0400129 int intarg;
Chris Masonb6cda9b2007-12-14 15:30:32 -0500130
Chris Mason95e05282007-08-29 09:11:44 -0400131 if (!options)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400132 return 0;
Chris Mason95e05282007-08-29 09:11:44 -0400133
Chris Masonbe20aa92007-12-17 20:14:01 -0500134 /*
135 * strsep changes the string, duplicate it because parse_options
136 * gets called twice
137 */
138 options = kstrdup(options, GFP_NOFS);
139 if (!options)
140 return -ENOMEM;
141
Chris Masonbe20aa92007-12-17 20:14:01 -0500142
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400143 while ((p = strsep(&options, ",")) != NULL) {
Chris Mason95e05282007-08-29 09:11:44 -0400144 int token;
145 if (!*p)
146 continue;
147
148 token = match_token(p, tokens, args);
149 switch (token) {
Chris Masondfe25022008-05-13 13:46:40 -0400150 case Opt_degraded:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400151 printk(KERN_INFO "btrfs: allowing degraded mounts\n");
152 btrfs_set_opt(info->mount_opt, DEGRADED);
Chris Masondfe25022008-05-13 13:46:40 -0400153 break;
Chris Mason95e05282007-08-29 09:11:44 -0400154 case Opt_subvol:
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400155 case Opt_device:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400156 /*
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400157 * These are parsed by btrfs_parse_early_options
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400158 * and can be happily ignored here.
159 */
Chris Masonb6cda9b2007-12-14 15:30:32 -0500160 break;
161 case Opt_nodatasum:
Chris Mason067c28a2009-06-11 09:30:13 -0400162 printk(KERN_INFO "btrfs: setting nodatasum\n");
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400163 btrfs_set_opt(info->mount_opt, NODATASUM);
Chris Masonbe20aa92007-12-17 20:14:01 -0500164 break;
165 case Opt_nodatacow:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400166 printk(KERN_INFO "btrfs: setting nodatacow\n");
167 btrfs_set_opt(info->mount_opt, NODATACOW);
168 btrfs_set_opt(info->mount_opt, NODATASUM);
Chris Mason95e05282007-08-29 09:11:44 -0400169 break;
Chris Masonc8b97812008-10-29 14:49:59 -0400170 case Opt_compress:
171 printk(KERN_INFO "btrfs: use compression\n");
172 btrfs_set_opt(info->mount_opt, COMPRESS);
173 break;
Chris Masone18e4802008-01-18 10:54:22 -0500174 case Opt_ssd:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400175 printk(KERN_INFO "btrfs: use ssd allocation scheme\n");
176 btrfs_set_opt(info->mount_opt, SSD);
Chris Masone18e4802008-01-18 10:54:22 -0500177 break;
Chris Mason451d7582009-06-09 20:28:34 -0400178 case Opt_ssd_spread:
179 printk(KERN_INFO "btrfs: use spread ssd "
180 "allocation scheme\n");
181 btrfs_set_opt(info->mount_opt, SSD);
182 btrfs_set_opt(info->mount_opt, SSD_SPREAD);
183 break;
Chris Mason3b30c222009-06-09 16:42:22 -0400184 case Opt_nossd:
Chris Mason451d7582009-06-09 20:28:34 -0400185 printk(KERN_INFO "btrfs: not using ssd allocation "
186 "scheme\n");
Chris Masonc2898112009-06-10 09:51:32 -0400187 btrfs_set_opt(info->mount_opt, NOSSD);
Chris Mason3b30c222009-06-09 16:42:22 -0400188 btrfs_clear_opt(info->mount_opt, SSD);
Chris Mason451d7582009-06-09 20:28:34 -0400189 btrfs_clear_opt(info->mount_opt, SSD_SPREAD);
Chris Mason3b30c222009-06-09 16:42:22 -0400190 break;
Chris Mason21ad10c2008-01-09 09:23:21 -0500191 case Opt_nobarrier:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400192 printk(KERN_INFO "btrfs: turning off barriers\n");
193 btrfs_set_opt(info->mount_opt, NOBARRIER);
Chris Mason21ad10c2008-01-09 09:23:21 -0500194 break;
Chris Mason4543df72008-06-11 21:47:56 -0400195 case Opt_thread_pool:
196 intarg = 0;
197 match_int(&args[0], &intarg);
198 if (intarg) {
199 info->thread_pool_size = intarg;
200 printk(KERN_INFO "btrfs: thread pool %d\n",
201 info->thread_pool_size);
202 }
203 break;
Chris Masonc59f8952007-12-17 20:14:04 -0500204 case Opt_max_extent:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400205 num = match_strdup(&args[0]);
206 if (num) {
207 info->max_extent = btrfs_parse_size(num);
208 kfree(num);
Chris Masonc59f8952007-12-17 20:14:04 -0500209
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400210 info->max_extent = max_t(u64,
211 info->max_extent, root->sectorsize);
212 printk(KERN_INFO "btrfs: max_extent at %llu\n",
Joel Becker21380932009-04-21 12:38:29 -0700213 (unsigned long long)info->max_extent);
Chris Masonc59f8952007-12-17 20:14:04 -0500214 }
215 break;
Chris Mason6f568d32008-01-29 16:03:38 -0500216 case Opt_max_inline:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400217 num = match_strdup(&args[0]);
218 if (num) {
219 info->max_inline = btrfs_parse_size(num);
220 kfree(num);
Chris Mason6f568d32008-01-29 16:03:38 -0500221
Chris Mason15ada042008-06-11 16:51:38 -0400222 if (info->max_inline) {
223 info->max_inline = max_t(u64,
224 info->max_inline,
225 root->sectorsize);
226 }
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400227 printk(KERN_INFO "btrfs: max_inline at %llu\n",
Joel Becker21380932009-04-21 12:38:29 -0700228 (unsigned long long)info->max_inline);
Chris Mason6f568d32008-01-29 16:03:38 -0500229 }
230 break;
Chris Mason8f662a72008-01-02 10:01:11 -0500231 case Opt_alloc_start:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400232 num = match_strdup(&args[0]);
233 if (num) {
234 info->alloc_start = btrfs_parse_size(num);
235 kfree(num);
236 printk(KERN_INFO
237 "btrfs: allocations start at %llu\n",
Joel Becker21380932009-04-21 12:38:29 -0700238 (unsigned long long)info->alloc_start);
Chris Mason8f662a72008-01-02 10:01:11 -0500239 }
240 break;
Josef Bacik33268ea2008-07-24 12:16:36 -0400241 case Opt_noacl:
242 root->fs_info->sb->s_flags &= ~MS_POSIXACL;
243 break;
Sage Weil3a5e1402009-04-02 16:49:40 -0400244 case Opt_notreelog:
245 printk(KERN_INFO "btrfs: disabling tree log\n");
246 btrfs_set_opt(info->mount_opt, NOTREELOG);
247 break;
Sage Weildccae992009-04-02 16:59:01 -0400248 case Opt_flushoncommit:
249 printk(KERN_INFO "btrfs: turning on flush-on-commit\n");
250 btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT);
251 break;
Josef Bacik97e728d2009-04-21 17:40:57 -0400252 case Opt_ratio:
253 intarg = 0;
254 match_int(&args[0], &intarg);
255 if (intarg) {
256 info->metadata_ratio = intarg;
257 printk(KERN_INFO "btrfs: metadata ratio %d\n",
258 info->metadata_ratio);
259 }
260 break;
Chris Mason95e05282007-08-29 09:11:44 -0400261 default:
Chris Masonbe20aa92007-12-17 20:14:01 -0500262 break;
Chris Mason95e05282007-08-29 09:11:44 -0400263 }
264 }
Chris Masonbe20aa92007-12-17 20:14:01 -0500265 kfree(options);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400266 return 0;
267}
268
269/*
270 * Parse mount options that are required early in the mount process.
271 *
272 * All other options will be parsed on much later in the mount process and
273 * only when we need to allocate a new super block.
274 */
Christoph Hellwig97288f22008-12-02 06:36:09 -0500275static int btrfs_parse_early_options(const char *options, fmode_t flags,
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400276 void *holder, char **subvol_name,
277 struct btrfs_fs_devices **fs_devices)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400278{
279 substring_t args[MAX_OPT_ARGS];
280 char *opts, *p;
281 int error = 0;
282
283 if (!options)
284 goto out;
285
286 /*
287 * strsep changes the string, duplicate it because parse_options
288 * gets called twice
289 */
290 opts = kstrdup(options, GFP_KERNEL);
291 if (!opts)
292 return -ENOMEM;
293
294 while ((p = strsep(&opts, ",")) != NULL) {
295 int token;
296 if (!*p)
297 continue;
298
299 token = match_token(p, tokens, args);
300 switch (token) {
301 case Opt_subvol:
302 *subvol_name = match_strdup(&args[0]);
303 break;
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400304 case Opt_device:
305 error = btrfs_scan_one_device(match_strdup(&args[0]),
306 flags, holder, fs_devices);
307 if (error)
308 goto out_free_opts;
309 break;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400310 default:
311 break;
312 }
313 }
314
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400315 out_free_opts:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400316 kfree(opts);
317 out:
318 /*
319 * If no subvolume name is specified we use the default one. Allocate
Chris Mason3de45862008-11-17 21:02:50 -0500320 * a copy of the string "." here so that code later in the
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400321 * mount path doesn't care if it's the default volume or another one.
322 */
323 if (!*subvol_name) {
Chris Mason3de45862008-11-17 21:02:50 -0500324 *subvol_name = kstrdup(".", GFP_KERNEL);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400325 if (!*subvol_name)
326 return -ENOMEM;
327 }
328 return error;
Chris Mason95e05282007-08-29 09:11:44 -0400329}
330
Chris Masond3977122009-01-05 21:25:51 -0500331static int btrfs_fill_super(struct super_block *sb,
Chris Mason8a4b83c2008-03-24 15:02:07 -0400332 struct btrfs_fs_devices *fs_devices,
Chris Masond3977122009-01-05 21:25:51 -0500333 void *data, int silent)
Chris Mason2e635a22007-03-21 11:12:56 -0400334{
Chris Masond3977122009-01-05 21:25:51 -0500335 struct inode *inode;
336 struct dentry *root_dentry;
Chris Masone20d96d2007-03-22 12:13:20 -0400337 struct btrfs_super_block *disk_super;
Chris Mason0f7d52f2007-04-09 10:42:37 -0400338 struct btrfs_root *tree_root;
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400339 struct btrfs_key key;
Chris Mason39279cc2007-06-12 06:35:45 -0400340 int err;
Chris Mason2e635a22007-03-21 11:12:56 -0400341
342 sb->s_maxbytes = MAX_LFS_FILESIZE;
Chris Mason2e635a22007-03-21 11:12:56 -0400343 sb->s_magic = BTRFS_SUPER_MAGIC;
Chris Masone20d96d2007-03-22 12:13:20 -0400344 sb->s_op = &btrfs_super_ops;
Balaji Raobe6e8dc2008-07-21 02:01:56 +0530345 sb->s_export_op = &btrfs_export_ops;
Josef Bacik5103e942007-11-16 11:45:54 -0500346 sb->s_xattr = btrfs_xattr_handlers;
Chris Mason2e635a22007-03-21 11:12:56 -0400347 sb->s_time_gran = 1;
Josef Bacik33268ea2008-07-24 12:16:36 -0400348 sb->s_flags |= MS_POSIXACL;
Chris Masone20d96d2007-03-22 12:13:20 -0400349
Chris Masondfe25022008-05-13 13:46:40 -0400350 tree_root = open_ctree(sb, fs_devices, (char *)data);
Chris Masond98237b2007-03-28 13:57:48 -0400351
Yane58ca022008-04-01 11:21:34 -0400352 if (IS_ERR(tree_root)) {
Chris Masone20d96d2007-03-22 12:13:20 -0400353 printk("btrfs: open_ctree failed\n");
Yane58ca022008-04-01 11:21:34 -0400354 return PTR_ERR(tree_root);
Chris Masone20d96d2007-03-22 12:13:20 -0400355 }
Chris Mason0f7d52f2007-04-09 10:42:37 -0400356 sb->s_fs_info = tree_root;
Chris Mason5f39d392007-10-15 16:14:19 -0400357 disk_super = &tree_root->fs_info->super_copy;
Chris Masonb888db22007-08-27 16:49:44 -0400358
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400359 key.objectid = BTRFS_FIRST_FREE_OBJECTID;
360 key.type = BTRFS_INODE_ITEM_KEY;
361 key.offset = 0;
362 inode = btrfs_iget(sb, &key, tree_root->fs_info->fs_root);
363 if (IS_ERR(inode)) {
364 err = PTR_ERR(inode);
Chris Mason39279cc2007-06-12 06:35:45 -0400365 goto fail_close;
366 }
Chris Mason2e635a22007-03-21 11:12:56 -0400367
Chris Masone20d96d2007-03-22 12:13:20 -0400368 root_dentry = d_alloc_root(inode);
369 if (!root_dentry) {
Chris Mason2e635a22007-03-21 11:12:56 -0400370 iput(inode);
Chris Mason39279cc2007-06-12 06:35:45 -0400371 err = -ENOMEM;
372 goto fail_close;
Chris Mason2e635a22007-03-21 11:12:56 -0400373 }
Yan Zhenge4404d62008-12-12 10:03:26 -0500374#if 0
Josef Bacik58176a92007-08-29 15:47:34 -0400375 /* this does the super kobj at the same time */
376 err = btrfs_sysfs_add_super(tree_root->fs_info);
377 if (err)
378 goto fail_close;
Yan Zhenge4404d62008-12-12 10:03:26 -0500379#endif
Josef Bacik58176a92007-08-29 15:47:34 -0400380
Chris Masone20d96d2007-03-22 12:13:20 -0400381 sb->s_root = root_dentry;
Chris Mason6885f302008-02-20 16:11:05 -0500382
Chris Mason6885f302008-02-20 16:11:05 -0500383 save_mount_options(sb, data);
Chris Mason2e635a22007-03-21 11:12:56 -0400384 return 0;
Chris Mason2e635a22007-03-21 11:12:56 -0400385
Chris Mason39279cc2007-06-12 06:35:45 -0400386fail_close:
387 close_ctree(tree_root);
Chris Masond5719762007-03-23 10:01:08 -0400388 return err;
389}
390
Sage Weil6bf13c02008-06-10 10:07:39 -0400391int btrfs_sync_fs(struct super_block *sb, int wait)
Chris Masond5719762007-03-23 10:01:08 -0400392{
393 struct btrfs_trans_handle *trans;
Sage Weildccae992009-04-02 16:59:01 -0400394 struct btrfs_root *root = btrfs_sb(sb);
Chris Masond5719762007-03-23 10:01:08 -0400395 int ret;
Chris Masondf2ce342007-03-23 11:00:45 -0400396
Chris Masond561c022007-03-23 19:47:49 -0400397 if (!wait) {
Chris Mason7cfcc172007-04-02 14:53:59 -0400398 filemap_flush(root->fs_info->btree_inode->i_mapping);
Chris Masond561c022007-03-23 19:47:49 -0400399 return 0;
400 }
Chris Mason771ed682008-11-06 22:02:51 -0500401
402 btrfs_start_delalloc_inodes(root);
403 btrfs_wait_ordered_extents(root, 0);
404
Chris Masond5719762007-03-23 10:01:08 -0400405 trans = btrfs_start_transaction(root, 1);
406 ret = btrfs_commit_transaction(trans, root);
Chris Mason54aa1f42007-06-22 14:16:25 -0400407 return ret;
Chris Masond5719762007-03-23 10:01:08 -0400408}
409
Eric Parisa9572a12009-04-02 16:46:06 -0400410static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
411{
412 struct btrfs_root *root = btrfs_sb(vfs->mnt_sb);
413 struct btrfs_fs_info *info = root->fs_info;
414
415 if (btrfs_test_opt(root, DEGRADED))
416 seq_puts(seq, ",degraded");
417 if (btrfs_test_opt(root, NODATASUM))
418 seq_puts(seq, ",nodatasum");
419 if (btrfs_test_opt(root, NODATACOW))
420 seq_puts(seq, ",nodatacow");
421 if (btrfs_test_opt(root, NOBARRIER))
422 seq_puts(seq, ",nobarrier");
423 if (info->max_extent != (u64)-1)
Joel Becker21380932009-04-21 12:38:29 -0700424 seq_printf(seq, ",max_extent=%llu",
425 (unsigned long long)info->max_extent);
Eric Parisa9572a12009-04-02 16:46:06 -0400426 if (info->max_inline != 8192 * 1024)
Joel Becker21380932009-04-21 12:38:29 -0700427 seq_printf(seq, ",max_inline=%llu",
428 (unsigned long long)info->max_inline);
Eric Parisa9572a12009-04-02 16:46:06 -0400429 if (info->alloc_start != 0)
Joel Becker21380932009-04-21 12:38:29 -0700430 seq_printf(seq, ",alloc_start=%llu",
431 (unsigned long long)info->alloc_start);
Eric Parisa9572a12009-04-02 16:46:06 -0400432 if (info->thread_pool_size != min_t(unsigned long,
433 num_online_cpus() + 2, 8))
434 seq_printf(seq, ",thread_pool=%d", info->thread_pool_size);
435 if (btrfs_test_opt(root, COMPRESS))
436 seq_puts(seq, ",compress");
Chris Masonc2898112009-06-10 09:51:32 -0400437 if (btrfs_test_opt(root, NOSSD))
438 seq_puts(seq, ",nossd");
Chris Mason451d7582009-06-09 20:28:34 -0400439 if (btrfs_test_opt(root, SSD_SPREAD))
440 seq_puts(seq, ",ssd_spread");
441 else if (btrfs_test_opt(root, SSD))
Eric Parisa9572a12009-04-02 16:46:06 -0400442 seq_puts(seq, ",ssd");
Sage Weil3a5e1402009-04-02 16:49:40 -0400443 if (btrfs_test_opt(root, NOTREELOG))
Sage Weil6b65c5c2009-05-14 13:52:21 -0400444 seq_puts(seq, ",notreelog");
Sage Weildccae992009-04-02 16:59:01 -0400445 if (btrfs_test_opt(root, FLUSHONCOMMIT))
Sage Weil6b65c5c2009-05-14 13:52:21 -0400446 seq_puts(seq, ",flushoncommit");
Eric Parisa9572a12009-04-02 16:46:06 -0400447 if (!(root->fs_info->sb->s_flags & MS_POSIXACL))
448 seq_puts(seq, ",noacl");
449 return 0;
450}
451
Chris Masona061fc82008-05-07 11:43:44 -0400452static int btrfs_test_super(struct super_block *s, void *data)
Chris Mason2e635a22007-03-21 11:12:56 -0400453{
Chris Masona061fc82008-05-07 11:43:44 -0400454 struct btrfs_fs_devices *test_fs_devices = data;
455 struct btrfs_root *root = btrfs_sb(s);
Yan4b82d6e2007-08-29 09:11:44 -0400456
Chris Masona061fc82008-05-07 11:43:44 -0400457 return root->fs_info->fs_devices == test_fs_devices;
Yan4b82d6e2007-08-29 09:11:44 -0400458}
459
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400460/*
461 * Find a superblock for the given device / mount point.
462 *
463 * Note: This is based on get_sb_bdev from fs/super.c with a few additions
464 * for multiple device setup. Make sure to keep it in sync.
465 */
466static int btrfs_get_sb(struct file_system_type *fs_type, int flags,
467 const char *dev_name, void *data, struct vfsmount *mnt)
Yan4b82d6e2007-08-29 09:11:44 -0400468{
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400469 char *subvol_name = NULL;
Yan4b82d6e2007-08-29 09:11:44 -0400470 struct block_device *bdev = NULL;
471 struct super_block *s;
472 struct dentry *root;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400473 struct btrfs_fs_devices *fs_devices = NULL;
Christoph Hellwig97288f22008-12-02 06:36:09 -0500474 fmode_t mode = FMODE_READ;
Yan4b82d6e2007-08-29 09:11:44 -0400475 int error = 0;
476
Christoph Hellwig97288f22008-12-02 06:36:09 -0500477 if (!(flags & MS_RDONLY))
478 mode |= FMODE_WRITE;
479
480 error = btrfs_parse_early_options(data, mode, fs_type,
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400481 &subvol_name, &fs_devices);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400482 if (error)
Shen Feng1f483662009-01-05 15:43:42 -0500483 return error;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400484
Christoph Hellwig97288f22008-12-02 06:36:09 -0500485 error = btrfs_scan_one_device(dev_name, mode, fs_type, &fs_devices);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400486 if (error)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400487 goto error_free_subvol_name;
Yan4b82d6e2007-08-29 09:11:44 -0400488
Christoph Hellwig97288f22008-12-02 06:36:09 -0500489 error = btrfs_open_devices(fs_devices, mode, fs_type);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400490 if (error)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400491 goto error_free_subvol_name;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400492
Yan Zheng2b820322008-11-17 21:11:30 -0500493 if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) {
494 error = -EACCES;
495 goto error_close_devices;
496 }
497
Chris Masondfe25022008-05-13 13:46:40 -0400498 bdev = fs_devices->latest_bdev;
Chris Masona061fc82008-05-07 11:43:44 -0400499 s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices);
Yan4b82d6e2007-08-29 09:11:44 -0400500 if (IS_ERR(s))
501 goto error_s;
502
503 if (s->s_root) {
504 if ((flags ^ s->s_flags) & MS_RDONLY) {
Al Viro6f5bbff2009-05-06 01:34:22 -0400505 deactivate_locked_super(s);
Yan4b82d6e2007-08-29 09:11:44 -0400506 error = -EBUSY;
Yan Zhengc146afa2008-11-12 14:34:12 -0500507 goto error_close_devices;
Yan4b82d6e2007-08-29 09:11:44 -0400508 }
509
Yan Zheng2b820322008-11-17 21:11:30 -0500510 btrfs_close_devices(fs_devices);
Yan4b82d6e2007-08-29 09:11:44 -0400511 } else {
512 char b[BDEVNAME_SIZE];
513
514 s->s_flags = flags;
515 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
Chris Mason8a4b83c2008-03-24 15:02:07 -0400516 error = btrfs_fill_super(s, fs_devices, data,
517 flags & MS_SILENT ? 1 : 0);
Yan4b82d6e2007-08-29 09:11:44 -0400518 if (error) {
Al Viro6f5bbff2009-05-06 01:34:22 -0400519 deactivate_locked_super(s);
Shen Feng1f483662009-01-05 15:43:42 -0500520 goto error_free_subvol_name;
Yan4b82d6e2007-08-29 09:11:44 -0400521 }
522
Chris Mason788f20e2008-04-28 15:29:42 -0400523 btrfs_sb(s)->fs_info->bdev_holder = fs_type;
Yan4b82d6e2007-08-29 09:11:44 -0400524 s->s_flags |= MS_ACTIVE;
525 }
526
David Woodhouse76fcef12008-08-19 16:49:35 +0100527 if (!strcmp(subvol_name, "."))
528 root = dget(s->s_root);
529 else {
530 mutex_lock(&s->s_root->d_inode->i_mutex);
Chris Masond3977122009-01-05 21:25:51 -0500531 root = lookup_one_len(subvol_name, s->s_root,
532 strlen(subvol_name));
David Woodhouse76fcef12008-08-19 16:49:35 +0100533 mutex_unlock(&s->s_root->d_inode->i_mutex);
Chris Masond3977122009-01-05 21:25:51 -0500534
David Woodhouse76fcef12008-08-19 16:49:35 +0100535 if (IS_ERR(root)) {
Al Viro6f5bbff2009-05-06 01:34:22 -0400536 deactivate_locked_super(s);
David Woodhouse76fcef12008-08-19 16:49:35 +0100537 error = PTR_ERR(root);
Shen Feng1f483662009-01-05 15:43:42 -0500538 goto error_free_subvol_name;
David Woodhouse76fcef12008-08-19 16:49:35 +0100539 }
540 if (!root->d_inode) {
541 dput(root);
Al Viro6f5bbff2009-05-06 01:34:22 -0400542 deactivate_locked_super(s);
David Woodhouse76fcef12008-08-19 16:49:35 +0100543 error = -ENXIO;
Shen Feng1f483662009-01-05 15:43:42 -0500544 goto error_free_subvol_name;
David Woodhouse76fcef12008-08-19 16:49:35 +0100545 }
Yan4b82d6e2007-08-29 09:11:44 -0400546 }
547
548 mnt->mnt_sb = s;
549 mnt->mnt_root = root;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400550
551 kfree(subvol_name);
Yan4b82d6e2007-08-29 09:11:44 -0400552 return 0;
553
554error_s:
555 error = PTR_ERR(s);
Yan Zhengc146afa2008-11-12 14:34:12 -0500556error_close_devices:
Chris Mason8a4b83c2008-03-24 15:02:07 -0400557 btrfs_close_devices(fs_devices);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400558error_free_subvol_name:
559 kfree(subvol_name);
Yan4b82d6e2007-08-29 09:11:44 -0400560 return error;
561}
Chris Mason2e635a22007-03-21 11:12:56 -0400562
Yan Zhengc146afa2008-11-12 14:34:12 -0500563static int btrfs_remount(struct super_block *sb, int *flags, char *data)
564{
565 struct btrfs_root *root = btrfs_sb(sb);
566 int ret;
567
Chris Masonb2880522009-02-12 09:37:35 -0500568 ret = btrfs_parse_options(root, data);
569 if (ret)
570 return -EINVAL;
571
Yan Zhengc146afa2008-11-12 14:34:12 -0500572 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
573 return 0;
574
575 if (*flags & MS_RDONLY) {
576 sb->s_flags |= MS_RDONLY;
577
578 ret = btrfs_commit_super(root);
579 WARN_ON(ret);
580 } else {
Yan Zheng2b820322008-11-17 21:11:30 -0500581 if (root->fs_info->fs_devices->rw_devices == 0)
582 return -EACCES;
583
Yan Zhengc146afa2008-11-12 14:34:12 -0500584 if (btrfs_super_log_root(&root->fs_info->super_copy) != 0)
585 return -EINVAL;
586
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400587 /* recover relocation */
588 ret = btrfs_recover_relocation(root);
Yan Zhengc146afa2008-11-12 14:34:12 -0500589 WARN_ON(ret);
590
591 ret = btrfs_cleanup_fs_roots(root->fs_info);
592 WARN_ON(ret);
593
594 sb->s_flags &= ~MS_RDONLY;
595 }
596
597 return 0;
598}
599
Chris Mason8fd17792007-04-19 21:01:03 -0400600static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
601{
602 struct btrfs_root *root = btrfs_sb(dentry->d_sb);
Chris Mason4b52dff2007-06-26 10:06:50 -0400603 struct btrfs_super_block *disk_super = &root->fs_info->super_copy;
Chris Masondb945352007-10-15 16:15:53 -0400604 int bits = dentry->d_sb->s_blocksize_bits;
David Woodhouse9d036322008-08-18 12:01:52 +0100605 __be32 *fsid = (__be32 *)root->fs_info->fsid;
Chris Mason8fd17792007-04-19 21:01:03 -0400606
607 buf->f_namelen = BTRFS_NAME_LEN;
Chris Masondb945352007-10-15 16:15:53 -0400608 buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits;
609 buf->f_bfree = buf->f_blocks -
610 (btrfs_super_bytes_used(disk_super) >> bits);
Chris Mason8fd17792007-04-19 21:01:03 -0400611 buf->f_bavail = buf->f_bfree;
612 buf->f_bsize = dentry->d_sb->s_blocksize;
613 buf->f_type = BTRFS_SUPER_MAGIC;
Chris Masond3977122009-01-05 21:25:51 -0500614
David Woodhouse9d036322008-08-18 12:01:52 +0100615 /* We treat it as constant endianness (it doesn't matter _which_)
Chris Masond3977122009-01-05 21:25:51 -0500616 because we want the fsid to come out the same whether mounted
David Woodhouse9d036322008-08-18 12:01:52 +0100617 on a big-endian or little-endian host */
618 buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]);
619 buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]);
David Woodhouse32d48fa2008-08-18 13:10:20 +0100620 /* Mask in the root object ID too, to disambiguate subvols */
621 buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32;
622 buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid;
623
Chris Mason8fd17792007-04-19 21:01:03 -0400624 return 0;
625}
Chris Masonb5133862007-04-24 11:52:22 -0400626
Chris Mason2e635a22007-03-21 11:12:56 -0400627static struct file_system_type btrfs_fs_type = {
628 .owner = THIS_MODULE,
629 .name = "btrfs",
630 .get_sb = btrfs_get_sb,
Chris Masona061fc82008-05-07 11:43:44 -0400631 .kill_sb = kill_anon_super,
Chris Mason2e635a22007-03-21 11:12:56 -0400632 .fs_flags = FS_REQUIRES_DEV,
633};
Chris Masona9218f62008-03-24 15:02:04 -0400634
Chris Masond352ac62008-09-29 15:18:18 -0400635/*
636 * used by btrfsctl to scan devices when no FS is mounted
637 */
Chris Mason8a4b83c2008-03-24 15:02:07 -0400638static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
639 unsigned long arg)
640{
641 struct btrfs_ioctl_vol_args *vol;
642 struct btrfs_fs_devices *fs_devices;
Chris Masonc071fcf2009-01-16 11:59:08 -0500643 int ret = -ENOTTY;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400644
Chris Masone441d542009-01-05 16:57:23 -0500645 if (!capable(CAP_SYS_ADMIN))
646 return -EPERM;
647
Li Zefandae7b662009-04-08 15:06:54 +0800648 vol = memdup_user((void __user *)arg, sizeof(*vol));
649 if (IS_ERR(vol))
650 return PTR_ERR(vol);
Chris Masonc071fcf2009-01-16 11:59:08 -0500651
Chris Mason8a4b83c2008-03-24 15:02:07 -0400652 switch (cmd) {
653 case BTRFS_IOC_SCAN_DEV:
Christoph Hellwig97288f22008-12-02 06:36:09 -0500654 ret = btrfs_scan_one_device(vol->name, FMODE_READ,
Chris Mason8a4b83c2008-03-24 15:02:07 -0400655 &btrfs_fs_type, &fs_devices);
656 break;
657 }
Li Zefandae7b662009-04-08 15:06:54 +0800658
Chris Mason8a4b83c2008-03-24 15:02:07 -0400659 kfree(vol);
Linda Knippersf819d832008-06-09 22:17:11 -0400660 return ret;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400661}
662
Linus Torvalds01762602009-01-10 06:09:52 -0800663static int btrfs_freeze(struct super_block *sb)
Yaned0dab62008-01-22 12:46:56 -0500664{
665 struct btrfs_root *root = btrfs_sb(sb);
Chris Masona74a4b92008-06-25 16:01:31 -0400666 mutex_lock(&root->fs_info->transaction_kthread_mutex);
667 mutex_lock(&root->fs_info->cleaner_mutex);
Linus Torvalds01762602009-01-10 06:09:52 -0800668 return 0;
Yaned0dab62008-01-22 12:46:56 -0500669}
670
Linus Torvalds01762602009-01-10 06:09:52 -0800671static int btrfs_unfreeze(struct super_block *sb)
Yaned0dab62008-01-22 12:46:56 -0500672{
673 struct btrfs_root *root = btrfs_sb(sb);
Chris Masona74a4b92008-06-25 16:01:31 -0400674 mutex_unlock(&root->fs_info->cleaner_mutex);
675 mutex_unlock(&root->fs_info->transaction_kthread_mutex);
Linus Torvalds01762602009-01-10 06:09:52 -0800676 return 0;
Yaned0dab62008-01-22 12:46:56 -0500677}
Chris Mason2e635a22007-03-21 11:12:56 -0400678
Chris Masone20d96d2007-03-22 12:13:20 -0400679static struct super_operations btrfs_super_ops = {
Chris Mason134e9732007-03-25 13:44:56 -0400680 .delete_inode = btrfs_delete_inode,
Chris Masone20d96d2007-03-22 12:13:20 -0400681 .put_super = btrfs_put_super,
Chris Masond5719762007-03-23 10:01:08 -0400682 .sync_fs = btrfs_sync_fs,
Eric Parisa9572a12009-04-02 16:46:06 -0400683 .show_options = btrfs_show_options,
Chris Mason4730a4b2007-03-26 12:00:39 -0400684 .write_inode = btrfs_write_inode,
Chris Masonb5133862007-04-24 11:52:22 -0400685 .dirty_inode = btrfs_dirty_inode,
Chris Mason2c90e5d2007-04-02 10:50:19 -0400686 .alloc_inode = btrfs_alloc_inode,
687 .destroy_inode = btrfs_destroy_inode,
Chris Mason8fd17792007-04-19 21:01:03 -0400688 .statfs = btrfs_statfs,
Yan Zhengc146afa2008-11-12 14:34:12 -0500689 .remount_fs = btrfs_remount,
Linus Torvalds01762602009-01-10 06:09:52 -0800690 .freeze_fs = btrfs_freeze,
691 .unfreeze_fs = btrfs_unfreeze,
Chris Masone20d96d2007-03-22 12:13:20 -0400692};
Chris Masona9218f62008-03-24 15:02:04 -0400693
694static const struct file_operations btrfs_ctl_fops = {
695 .unlocked_ioctl = btrfs_control_ioctl,
696 .compat_ioctl = btrfs_control_ioctl,
697 .owner = THIS_MODULE,
698};
699
700static struct miscdevice btrfs_misc = {
701 .minor = MISC_DYNAMIC_MINOR,
702 .name = "btrfs-control",
703 .fops = &btrfs_ctl_fops
704};
705
706static int btrfs_interface_init(void)
707{
708 return misc_register(&btrfs_misc);
709}
710
Christoph Hellwigb2950862008-12-02 09:54:17 -0500711static void btrfs_interface_exit(void)
Chris Masona9218f62008-03-24 15:02:04 -0400712{
713 if (misc_deregister(&btrfs_misc) < 0)
Chris Masond3977122009-01-05 21:25:51 -0500714 printk(KERN_INFO "misc_deregister failed for control device");
Chris Masona9218f62008-03-24 15:02:04 -0400715}
716
Chris Mason2e635a22007-03-21 11:12:56 -0400717static int __init init_btrfs_fs(void)
718{
Chris Mason2c90e5d2007-04-02 10:50:19 -0400719 int err;
Josef Bacik58176a92007-08-29 15:47:34 -0400720
721 err = btrfs_init_sysfs();
722 if (err)
723 return err;
724
Chris Mason39279cc2007-06-12 06:35:45 -0400725 err = btrfs_init_cachep();
Chris Mason2c90e5d2007-04-02 10:50:19 -0400726 if (err)
Chris Masona74a4b92008-06-25 16:01:31 -0400727 goto free_sysfs;
Chris Masond1310b22008-01-24 16:13:08 -0500728
729 err = extent_io_init();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500730 if (err)
731 goto free_cachep;
732
Chris Masond1310b22008-01-24 16:13:08 -0500733 err = extent_map_init();
734 if (err)
735 goto free_extent_io;
736
Chris Masona9218f62008-03-24 15:02:04 -0400737 err = btrfs_interface_init();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500738 if (err)
739 goto free_extent_map;
Chris Masonc8b97812008-10-29 14:49:59 -0400740
Chris Masona9218f62008-03-24 15:02:04 -0400741 err = register_filesystem(&btrfs_fs_type);
742 if (err)
743 goto unregister_ioctl;
Chris Masonb3c3da72008-07-23 12:12:13 -0400744
745 printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION);
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500746 return 0;
747
Chris Masona9218f62008-03-24 15:02:04 -0400748unregister_ioctl:
749 btrfs_interface_exit();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500750free_extent_map:
751 extent_map_exit();
Chris Masond1310b22008-01-24 16:13:08 -0500752free_extent_io:
753 extent_io_exit();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500754free_cachep:
755 btrfs_destroy_cachep();
Chris Masona74a4b92008-06-25 16:01:31 -0400756free_sysfs:
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500757 btrfs_exit_sysfs();
758 return err;
Chris Mason2e635a22007-03-21 11:12:56 -0400759}
760
761static void __exit exit_btrfs_fs(void)
762{
Chris Mason39279cc2007-06-12 06:35:45 -0400763 btrfs_destroy_cachep();
Chris Masona52d9a82007-08-27 16:49:44 -0400764 extent_map_exit();
Chris Masond1310b22008-01-24 16:13:08 -0500765 extent_io_exit();
Chris Masona9218f62008-03-24 15:02:04 -0400766 btrfs_interface_exit();
Chris Mason2e635a22007-03-21 11:12:56 -0400767 unregister_filesystem(&btrfs_fs_type);
Josef Bacik58176a92007-08-29 15:47:34 -0400768 btrfs_exit_sysfs();
Chris Mason8a4b83c2008-03-24 15:02:07 -0400769 btrfs_cleanup_fs_uuids();
Chris Masonc8b97812008-10-29 14:49:59 -0400770 btrfs_zlib_exit();
Chris Mason2e635a22007-03-21 11:12:56 -0400771}
772
773module_init(init_btrfs_fs)
774module_exit(exit_btrfs_fs)
775
776MODULE_LICENSE("GPL");