blob: 3ce97b217cbeae21ef23e57fe2a605ed11572af1 [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>
Dan Magenheimer90a887c2011-05-26 10:01:56 -060042#include <linux/cleancache.h>
Josef Bacik22c44fe2011-11-30 10:45:38 -050043#include <linux/ratelimit.h>
Chris Mason4b4e25f2008-11-20 10:22:27 -050044#include "compat.h"
Miao Xie16cdcec2011-04-22 18:12:22 +080045#include "delayed-inode.h"
Chris Mason2e635a22007-03-21 11:12:56 -040046#include "ctree.h"
Chris Masone20d96d2007-03-22 12:13:20 -040047#include "disk-io.h"
Chris Masond5719762007-03-23 10:01:08 -040048#include "transaction.h"
Chris Mason2c90e5d2007-04-02 10:50:19 -040049#include "btrfs_inode.h"
Chris Masonc5739bb2007-04-10 09:27:04 -040050#include "ioctl.h"
Chris Mason3a686372007-05-24 13:35:57 -040051#include "print-tree.h"
Josef Bacik5103e942007-11-16 11:45:54 -050052#include "xattr.h"
Chris Mason8a4b83c2008-03-24 15:02:07 -040053#include "volumes.h"
Chris Masonb3c3da72008-07-23 12:12:13 -040054#include "version.h"
Balaji Raobe6e8dc2008-07-21 02:01:56 +053055#include "export.h"
Chris Masonc8b97812008-10-29 14:49:59 -040056#include "compression.h"
Chris Mason2e635a22007-03-21 11:12:56 -040057
liubo1abe9b82011-03-24 11:18:59 +000058#define CREATE_TRACE_POINTS
59#include <trace/events/btrfs.h>
60
Alexey Dobriyanb87221d2009-09-21 17:01:09 -070061static const struct super_operations btrfs_super_ops;
Josef Bacik830c4ad2011-07-25 15:55:42 -040062static struct file_system_type btrfs_fs_type;
Chris Masone20d96d2007-03-22 12:13:20 -040063
liuboacce9522011-01-06 19:30:25 +080064static const char *btrfs_decode_error(struct btrfs_fs_info *fs_info, int errno,
65 char nbuf[16])
66{
67 char *errstr = NULL;
68
69 switch (errno) {
70 case -EIO:
71 errstr = "IO failure";
72 break;
73 case -ENOMEM:
74 errstr = "Out of memory";
75 break;
76 case -EROFS:
77 errstr = "Readonly filesystem";
78 break;
79 default:
80 if (nbuf) {
81 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
82 errstr = nbuf;
83 }
84 break;
85 }
86
87 return errstr;
88}
89
90static void __save_error_info(struct btrfs_fs_info *fs_info)
91{
92 /*
93 * today we only save the error info into ram. Long term we'll
94 * also send it down to the disk
95 */
96 fs_info->fs_state = BTRFS_SUPER_FLAG_ERROR;
97}
98
99/* NOTE:
100 * We move write_super stuff at umount in order to avoid deadlock
101 * for umount hold all lock.
102 */
103static void save_error_info(struct btrfs_fs_info *fs_info)
104{
105 __save_error_info(fs_info);
106}
107
108/* btrfs handle error by forcing the filesystem readonly */
109static void btrfs_handle_error(struct btrfs_fs_info *fs_info)
110{
111 struct super_block *sb = fs_info->sb;
112
113 if (sb->s_flags & MS_RDONLY)
114 return;
115
116 if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) {
117 sb->s_flags |= MS_RDONLY;
118 printk(KERN_INFO "btrfs is forced readonly\n");
119 }
120}
121
122/*
123 * __btrfs_std_error decodes expected errors from the caller and
124 * invokes the approciate error response.
125 */
126void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
127 unsigned int line, int errno)
128{
129 struct super_block *sb = fs_info->sb;
130 char nbuf[16];
131 const char *errstr;
132
133 /*
134 * Special case: if the error is EROFS, and we're already
135 * under MS_RDONLY, then it is safe here.
136 */
137 if (errno == -EROFS && (sb->s_flags & MS_RDONLY))
138 return;
139
140 errstr = btrfs_decode_error(fs_info, errno, nbuf);
141 printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: %s\n",
142 sb->s_id, function, line, errstr);
143 save_error_info(fs_info);
144
145 btrfs_handle_error(fs_info);
146}
147
Chris Masond3977122009-01-05 21:25:51 -0500148static void btrfs_put_super(struct super_block *sb)
Chris Masone20d96d2007-03-22 12:13:20 -0400149{
Al Viro815745c2011-11-17 15:40:49 -0500150 (void)close_ctree(btrfs_sb(sb)->tree_root);
Al Viroaea52e12011-11-17 01:22:46 -0500151 /* FIXME: need to fix VFS to return error? */
152 /* AV: return it _where_? ->put_super() can be triggered by any number
153 * of async events, up to and including delivery of SIGKILL to the
154 * last process that kept it busy. Or segfault in the aforementioned
155 * process... Whom would you report that to?
156 */
Chris Masone20d96d2007-03-22 12:13:20 -0400157}
Chris Mason2e635a22007-03-21 11:12:56 -0400158
Chris Mason95e05282007-08-29 09:11:44 -0400159enum {
Josef Bacik73f73412009-12-04 17:38:27 +0000160 Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum,
Josef Bacik287a0ab2010-03-19 18:07:23 +0000161 Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd,
162 Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress,
Li Zefan261507a02010-12-17 14:21:50 +0800163 Opt_compress_type, Opt_compress_force, Opt_compress_force_type,
164 Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard,
Chris Mason91435652011-02-16 13:10:41 -0500165 Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed,
Ilya Dryomov9555c6c2012-01-16 22:04:48 +0200166 Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache,
167 Opt_no_space_cache, Opt_recovery, Opt_skip_balance,
Stefan Behrens21adbd52011-11-09 13:44:05 +0100168 Opt_check_integrity, Opt_check_integrity_including_extent_data,
169 Opt_check_integrity_print_mask,
Ilya Dryomov9555c6c2012-01-16 22:04:48 +0200170 Opt_err,
Chris Mason95e05282007-08-29 09:11:44 -0400171};
172
173static match_table_t tokens = {
Chris Masondfe25022008-05-13 13:46:40 -0400174 {Opt_degraded, "degraded"},
Chris Mason95e05282007-08-29 09:11:44 -0400175 {Opt_subvol, "subvol=%s"},
Josef Bacik73f73412009-12-04 17:38:27 +0000176 {Opt_subvolid, "subvolid=%d"},
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400177 {Opt_device, "device=%s"},
Chris Masonb6cda9b2007-12-14 15:30:32 -0500178 {Opt_nodatasum, "nodatasum"},
Chris Masonbe20aa92007-12-17 20:14:01 -0500179 {Opt_nodatacow, "nodatacow"},
Chris Mason21ad10c2008-01-09 09:23:21 -0500180 {Opt_nobarrier, "nobarrier"},
Chris Mason6f568d32008-01-29 16:03:38 -0500181 {Opt_max_inline, "max_inline=%s"},
Chris Mason8f662a72008-01-02 10:01:11 -0500182 {Opt_alloc_start, "alloc_start=%s"},
Chris Mason4543df72008-06-11 21:47:56 -0400183 {Opt_thread_pool, "thread_pool=%d"},
Chris Masonc8b97812008-10-29 14:49:59 -0400184 {Opt_compress, "compress"},
Li Zefan261507a02010-12-17 14:21:50 +0800185 {Opt_compress_type, "compress=%s"},
Chris Masona555f812010-01-28 16:18:15 -0500186 {Opt_compress_force, "compress-force"},
Li Zefan261507a02010-12-17 14:21:50 +0800187 {Opt_compress_force_type, "compress-force=%s"},
Chris Masone18e4802008-01-18 10:54:22 -0500188 {Opt_ssd, "ssd"},
Chris Mason451d7582009-06-09 20:28:34 -0400189 {Opt_ssd_spread, "ssd_spread"},
Chris Mason3b30c222009-06-09 16:42:22 -0400190 {Opt_nossd, "nossd"},
Josef Bacik33268ea2008-07-24 12:16:36 -0400191 {Opt_noacl, "noacl"},
Sage Weil3a5e1402009-04-02 16:49:40 -0400192 {Opt_notreelog, "notreelog"},
Sage Weildccae992009-04-02 16:59:01 -0400193 {Opt_flushoncommit, "flushoncommit"},
Josef Bacik97e728d2009-04-21 17:40:57 -0400194 {Opt_ratio, "metadata_ratio=%d"},
Christoph Hellwige244a0a2009-10-14 09:24:59 -0400195 {Opt_discard, "discard"},
Josef Bacik0af3d002010-06-21 14:48:16 -0400196 {Opt_space_cache, "space_cache"},
Josef Bacik88c2ba32010-09-21 14:21:34 -0400197 {Opt_clear_cache, "clear_cache"},
Sage Weil4260f7c2010-10-29 15:46:43 -0400198 {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"},
Chris Mason91435652011-02-16 13:10:41 -0500199 {Opt_enospc_debug, "enospc_debug"},
Xin Zhonge15d0542011-04-06 07:33:51 +0000200 {Opt_subvolrootid, "subvolrootid=%d"},
Chris Mason4cb53002011-05-24 15:35:30 -0400201 {Opt_defrag, "autodefrag"},
Chris Mason4b9465c2011-06-03 09:36:29 -0400202 {Opt_inode_cache, "inode_cache"},
David Sterba89655932011-11-11 10:14:57 -0500203 {Opt_no_space_cache, "nospace_cache"},
Chris Masonaf31f5e2011-11-03 15:17:42 -0400204 {Opt_recovery, "recovery"},
Ilya Dryomov9555c6c2012-01-16 22:04:48 +0200205 {Opt_skip_balance, "skip_balance"},
Stefan Behrens21adbd52011-11-09 13:44:05 +0100206 {Opt_check_integrity, "check_int"},
207 {Opt_check_integrity_including_extent_data, "check_int_data"},
208 {Opt_check_integrity_print_mask, "check_int_print_mask=%d"},
Josef Bacik33268ea2008-07-24 12:16:36 -0400209 {Opt_err, NULL},
Chris Mason95e05282007-08-29 09:11:44 -0400210};
211
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400212/*
213 * Regular mount options parser. Everything that is needed only when
214 * reading in a new superblock is parsed here.
215 */
216int btrfs_parse_options(struct btrfs_root *root, char *options)
Chris Mason95e05282007-08-29 09:11:44 -0400217{
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400218 struct btrfs_fs_info *info = root->fs_info;
Chris Mason95e05282007-08-29 09:11:44 -0400219 substring_t args[MAX_OPT_ARGS];
Josef Bacik73bc1872011-10-03 14:07:49 -0400220 char *p, *num, *orig = NULL;
221 u64 cache_gen;
Chris Mason4543df72008-06-11 21:47:56 -0400222 int intarg;
Sage Weila7a3f7c2009-11-07 06:19:16 +0000223 int ret = 0;
Li Zefan261507a02010-12-17 14:21:50 +0800224 char *compress_type;
225 bool compress_force = false;
Chris Masonb6cda9b2007-12-14 15:30:32 -0500226
David Sterba6c417612011-04-13 15:41:04 +0200227 cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy);
Josef Bacik73bc1872011-10-03 14:07:49 -0400228 if (cache_gen)
229 btrfs_set_opt(info->mount_opt, SPACE_CACHE);
230
Chris Mason95e05282007-08-29 09:11:44 -0400231 if (!options)
Josef Bacik73bc1872011-10-03 14:07:49 -0400232 goto out;
Chris Mason95e05282007-08-29 09:11:44 -0400233
Chris Masonbe20aa92007-12-17 20:14:01 -0500234 /*
235 * strsep changes the string, duplicate it because parse_options
236 * gets called twice
237 */
238 options = kstrdup(options, GFP_NOFS);
239 if (!options)
240 return -ENOMEM;
241
Josef Bacikda495ec2010-02-25 20:38:35 +0000242 orig = options;
Chris Masonbe20aa92007-12-17 20:14:01 -0500243
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400244 while ((p = strsep(&options, ",")) != NULL) {
Chris Mason95e05282007-08-29 09:11:44 -0400245 int token;
246 if (!*p)
247 continue;
248
249 token = match_token(p, tokens, args);
250 switch (token) {
Chris Masondfe25022008-05-13 13:46:40 -0400251 case Opt_degraded:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400252 printk(KERN_INFO "btrfs: allowing degraded mounts\n");
253 btrfs_set_opt(info->mount_opt, DEGRADED);
Chris Masondfe25022008-05-13 13:46:40 -0400254 break;
Chris Mason95e05282007-08-29 09:11:44 -0400255 case Opt_subvol:
Josef Bacik73f73412009-12-04 17:38:27 +0000256 case Opt_subvolid:
Xin Zhonge15d0542011-04-06 07:33:51 +0000257 case Opt_subvolrootid:
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400258 case Opt_device:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400259 /*
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400260 * These are parsed by btrfs_parse_early_options
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400261 * and can be happily ignored here.
262 */
Chris Masonb6cda9b2007-12-14 15:30:32 -0500263 break;
264 case Opt_nodatasum:
Chris Mason067c28a2009-06-11 09:30:13 -0400265 printk(KERN_INFO "btrfs: setting nodatasum\n");
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400266 btrfs_set_opt(info->mount_opt, NODATASUM);
Chris Masonbe20aa92007-12-17 20:14:01 -0500267 break;
268 case Opt_nodatacow:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400269 printk(KERN_INFO "btrfs: setting nodatacow\n");
270 btrfs_set_opt(info->mount_opt, NODATACOW);
271 btrfs_set_opt(info->mount_opt, NODATASUM);
Chris Mason95e05282007-08-29 09:11:44 -0400272 break;
Chris Masona555f812010-01-28 16:18:15 -0500273 case Opt_compress_force:
Li Zefan261507a02010-12-17 14:21:50 +0800274 case Opt_compress_force_type:
275 compress_force = true;
276 case Opt_compress:
277 case Opt_compress_type:
278 if (token == Opt_compress ||
279 token == Opt_compress_force ||
280 strcmp(args[0].from, "zlib") == 0) {
281 compress_type = "zlib";
282 info->compress_type = BTRFS_COMPRESS_ZLIB;
Li Zefana6fa6fa2010-10-25 15:12:26 +0800283 } else if (strcmp(args[0].from, "lzo") == 0) {
284 compress_type = "lzo";
285 info->compress_type = BTRFS_COMPRESS_LZO;
Li Zefan261507a02010-12-17 14:21:50 +0800286 } else {
287 ret = -EINVAL;
288 goto out;
289 }
290
Chris Masona555f812010-01-28 16:18:15 -0500291 btrfs_set_opt(info->mount_opt, COMPRESS);
Li Zefan261507a02010-12-17 14:21:50 +0800292 if (compress_force) {
293 btrfs_set_opt(info->mount_opt, FORCE_COMPRESS);
294 pr_info("btrfs: force %s compression\n",
295 compress_type);
296 } else
297 pr_info("btrfs: use %s compression\n",
298 compress_type);
Chris Masona555f812010-01-28 16:18:15 -0500299 break;
Chris Masone18e4802008-01-18 10:54:22 -0500300 case Opt_ssd:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400301 printk(KERN_INFO "btrfs: use ssd allocation scheme\n");
302 btrfs_set_opt(info->mount_opt, SSD);
Chris Masone18e4802008-01-18 10:54:22 -0500303 break;
Chris Mason451d7582009-06-09 20:28:34 -0400304 case Opt_ssd_spread:
305 printk(KERN_INFO "btrfs: use spread ssd "
306 "allocation scheme\n");
307 btrfs_set_opt(info->mount_opt, SSD);
308 btrfs_set_opt(info->mount_opt, SSD_SPREAD);
309 break;
Chris Mason3b30c222009-06-09 16:42:22 -0400310 case Opt_nossd:
Chris Mason451d7582009-06-09 20:28:34 -0400311 printk(KERN_INFO "btrfs: not using ssd allocation "
312 "scheme\n");
Chris Masonc2898112009-06-10 09:51:32 -0400313 btrfs_set_opt(info->mount_opt, NOSSD);
Chris Mason3b30c222009-06-09 16:42:22 -0400314 btrfs_clear_opt(info->mount_opt, SSD);
Chris Mason451d7582009-06-09 20:28:34 -0400315 btrfs_clear_opt(info->mount_opt, SSD_SPREAD);
Chris Mason3b30c222009-06-09 16:42:22 -0400316 break;
Chris Mason21ad10c2008-01-09 09:23:21 -0500317 case Opt_nobarrier:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400318 printk(KERN_INFO "btrfs: turning off barriers\n");
319 btrfs_set_opt(info->mount_opt, NOBARRIER);
Chris Mason21ad10c2008-01-09 09:23:21 -0500320 break;
Chris Mason4543df72008-06-11 21:47:56 -0400321 case Opt_thread_pool:
322 intarg = 0;
323 match_int(&args[0], &intarg);
324 if (intarg) {
325 info->thread_pool_size = intarg;
326 printk(KERN_INFO "btrfs: thread pool %d\n",
327 info->thread_pool_size);
328 }
329 break;
Chris Mason6f568d32008-01-29 16:03:38 -0500330 case Opt_max_inline:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400331 num = match_strdup(&args[0]);
332 if (num) {
Akinobu Mita91748462010-02-28 10:59:11 +0000333 info->max_inline = memparse(num, NULL);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400334 kfree(num);
Chris Mason6f568d32008-01-29 16:03:38 -0500335
Chris Mason15ada042008-06-11 16:51:38 -0400336 if (info->max_inline) {
337 info->max_inline = max_t(u64,
338 info->max_inline,
339 root->sectorsize);
340 }
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400341 printk(KERN_INFO "btrfs: max_inline at %llu\n",
Joel Becker21380932009-04-21 12:38:29 -0700342 (unsigned long long)info->max_inline);
Chris Mason6f568d32008-01-29 16:03:38 -0500343 }
344 break;
Chris Mason8f662a72008-01-02 10:01:11 -0500345 case Opt_alloc_start:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400346 num = match_strdup(&args[0]);
347 if (num) {
Akinobu Mita91748462010-02-28 10:59:11 +0000348 info->alloc_start = memparse(num, NULL);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400349 kfree(num);
350 printk(KERN_INFO
351 "btrfs: allocations start at %llu\n",
Joel Becker21380932009-04-21 12:38:29 -0700352 (unsigned long long)info->alloc_start);
Chris Mason8f662a72008-01-02 10:01:11 -0500353 }
354 break;
Josef Bacik33268ea2008-07-24 12:16:36 -0400355 case Opt_noacl:
356 root->fs_info->sb->s_flags &= ~MS_POSIXACL;
357 break;
Sage Weil3a5e1402009-04-02 16:49:40 -0400358 case Opt_notreelog:
359 printk(KERN_INFO "btrfs: disabling tree log\n");
360 btrfs_set_opt(info->mount_opt, NOTREELOG);
361 break;
Sage Weildccae992009-04-02 16:59:01 -0400362 case Opt_flushoncommit:
363 printk(KERN_INFO "btrfs: turning on flush-on-commit\n");
364 btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT);
365 break;
Josef Bacik97e728d2009-04-21 17:40:57 -0400366 case Opt_ratio:
367 intarg = 0;
368 match_int(&args[0], &intarg);
369 if (intarg) {
370 info->metadata_ratio = intarg;
371 printk(KERN_INFO "btrfs: metadata ratio %d\n",
372 info->metadata_ratio);
373 }
374 break;
Christoph Hellwige244a0a2009-10-14 09:24:59 -0400375 case Opt_discard:
376 btrfs_set_opt(info->mount_opt, DISCARD);
377 break;
Josef Bacik0af3d002010-06-21 14:48:16 -0400378 case Opt_space_cache:
Josef Bacik0af3d002010-06-21 14:48:16 -0400379 btrfs_set_opt(info->mount_opt, SPACE_CACHE);
Josef Bacik0de90872010-11-19 13:40:41 +0000380 break;
Josef Bacik73bc1872011-10-03 14:07:49 -0400381 case Opt_no_space_cache:
382 printk(KERN_INFO "btrfs: disabling disk space caching\n");
383 btrfs_clear_opt(info->mount_opt, SPACE_CACHE);
384 break;
Chris Mason4b9465c2011-06-03 09:36:29 -0400385 case Opt_inode_cache:
386 printk(KERN_INFO "btrfs: enabling inode map caching\n");
387 btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE);
388 break;
Josef Bacik88c2ba32010-09-21 14:21:34 -0400389 case Opt_clear_cache:
390 printk(KERN_INFO "btrfs: force clearing of disk cache\n");
391 btrfs_set_opt(info->mount_opt, CLEAR_CACHE);
Josef Bacik0af3d002010-06-21 14:48:16 -0400392 break;
Sage Weil4260f7c2010-10-29 15:46:43 -0400393 case Opt_user_subvol_rm_allowed:
394 btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED);
395 break;
Chris Mason91435652011-02-16 13:10:41 -0500396 case Opt_enospc_debug:
397 btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG);
398 break;
Chris Mason4cb53002011-05-24 15:35:30 -0400399 case Opt_defrag:
400 printk(KERN_INFO "btrfs: enabling auto defrag");
401 btrfs_set_opt(info->mount_opt, AUTO_DEFRAG);
402 break;
Chris Masonaf31f5e2011-11-03 15:17:42 -0400403 case Opt_recovery:
404 printk(KERN_INFO "btrfs: enabling auto recovery");
405 btrfs_set_opt(info->mount_opt, RECOVERY);
406 break;
Ilya Dryomov9555c6c2012-01-16 22:04:48 +0200407 case Opt_skip_balance:
408 btrfs_set_opt(info->mount_opt, SKIP_BALANCE);
409 break;
Stefan Behrens21adbd52011-11-09 13:44:05 +0100410#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
411 case Opt_check_integrity_including_extent_data:
412 printk(KERN_INFO "btrfs: enabling check integrity"
413 " including extent data\n");
414 btrfs_set_opt(info->mount_opt,
415 CHECK_INTEGRITY_INCLUDING_EXTENT_DATA);
416 btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY);
417 break;
418 case Opt_check_integrity:
419 printk(KERN_INFO "btrfs: enabling check integrity\n");
420 btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY);
421 break;
422 case Opt_check_integrity_print_mask:
423 intarg = 0;
424 match_int(&args[0], &intarg);
425 if (intarg) {
426 info->check_integrity_print_mask = intarg;
427 printk(KERN_INFO "btrfs:"
428 " check_integrity_print_mask 0x%x\n",
429 info->check_integrity_print_mask);
430 }
431 break;
432#else
433 case Opt_check_integrity_including_extent_data:
434 case Opt_check_integrity:
435 case Opt_check_integrity_print_mask:
436 printk(KERN_ERR "btrfs: support for check_integrity*"
437 " not compiled in!\n");
438 ret = -EINVAL;
439 goto out;
440#endif
Sage Weila7a3f7c2009-11-07 06:19:16 +0000441 case Opt_err:
442 printk(KERN_INFO "btrfs: unrecognized mount option "
443 "'%s'\n", p);
444 ret = -EINVAL;
445 goto out;
Chris Mason95e05282007-08-29 09:11:44 -0400446 default:
Chris Masonbe20aa92007-12-17 20:14:01 -0500447 break;
Chris Mason95e05282007-08-29 09:11:44 -0400448 }
449 }
Sage Weila7a3f7c2009-11-07 06:19:16 +0000450out:
Josef Bacik73bc1872011-10-03 14:07:49 -0400451 if (!ret && btrfs_test_opt(root, SPACE_CACHE))
452 printk(KERN_INFO "btrfs: disk space caching is enabled\n");
Josef Bacikda495ec2010-02-25 20:38:35 +0000453 kfree(orig);
Sage Weila7a3f7c2009-11-07 06:19:16 +0000454 return ret;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400455}
456
457/*
458 * Parse mount options that are required early in the mount process.
459 *
460 * All other options will be parsed on much later in the mount process and
461 * only when we need to allocate a new super block.
462 */
Christoph Hellwig97288f22008-12-02 06:36:09 -0500463static int btrfs_parse_early_options(const char *options, fmode_t flags,
Josef Bacik73f73412009-12-04 17:38:27 +0000464 void *holder, char **subvol_name, u64 *subvol_objectid,
Xin Zhonge15d0542011-04-06 07:33:51 +0000465 u64 *subvol_rootid, struct btrfs_fs_devices **fs_devices)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400466{
467 substring_t args[MAX_OPT_ARGS];
Jeff Liu83c8c9b2011-09-14 14:11:21 +0800468 char *device_name, *opts, *orig, *p;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400469 int error = 0;
Josef Bacik73f73412009-12-04 17:38:27 +0000470 int intarg;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400471
472 if (!options)
Josef Bacik830c4ad2011-07-25 15:55:42 -0400473 return 0;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400474
475 /*
476 * strsep changes the string, duplicate it because parse_options
477 * gets called twice
478 */
479 opts = kstrdup(options, GFP_KERNEL);
480 if (!opts)
481 return -ENOMEM;
Tero Roponen3f3d0bc2010-12-27 16:43:13 +0800482 orig = opts;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400483
484 while ((p = strsep(&opts, ",")) != NULL) {
485 int token;
486 if (!*p)
487 continue;
488
489 token = match_token(p, tokens, args);
490 switch (token) {
491 case Opt_subvol:
Ilya Dryomova90e8b62011-11-08 16:47:55 +0200492 kfree(*subvol_name);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400493 *subvol_name = match_strdup(&args[0]);
494 break;
Josef Bacik73f73412009-12-04 17:38:27 +0000495 case Opt_subvolid:
496 intarg = 0;
Josef Bacik4849f012009-12-14 19:18:38 +0000497 error = match_int(&args[0], &intarg);
498 if (!error) {
499 /* we want the original fs_tree */
500 if (!intarg)
501 *subvol_objectid =
502 BTRFS_FS_TREE_OBJECTID;
503 else
504 *subvol_objectid = intarg;
505 }
Josef Bacik73f73412009-12-04 17:38:27 +0000506 break;
Xin Zhonge15d0542011-04-06 07:33:51 +0000507 case Opt_subvolrootid:
508 intarg = 0;
509 error = match_int(&args[0], &intarg);
510 if (!error) {
511 /* we want the original fs_tree */
512 if (!intarg)
513 *subvol_rootid =
514 BTRFS_FS_TREE_OBJECTID;
515 else
516 *subvol_rootid = intarg;
517 }
518 break;
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400519 case Opt_device:
Jeff Liu83c8c9b2011-09-14 14:11:21 +0800520 device_name = match_strdup(&args[0]);
521 if (!device_name) {
522 error = -ENOMEM;
523 goto out;
524 }
525 error = btrfs_scan_one_device(device_name,
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400526 flags, holder, fs_devices);
Jeff Liu83c8c9b2011-09-14 14:11:21 +0800527 kfree(device_name);
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400528 if (error)
Josef Bacik830c4ad2011-07-25 15:55:42 -0400529 goto out;
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400530 break;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400531 default:
532 break;
533 }
534 }
535
Josef Bacik830c4ad2011-07-25 15:55:42 -0400536out:
Tero Roponen3f3d0bc2010-12-27 16:43:13 +0800537 kfree(orig);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400538 return error;
Chris Mason95e05282007-08-29 09:11:44 -0400539}
540
Josef Bacik73f73412009-12-04 17:38:27 +0000541static struct dentry *get_default_root(struct super_block *sb,
542 u64 subvol_objectid)
543{
Al Viro815745c2011-11-17 15:40:49 -0500544 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
545 struct btrfs_root *root = fs_info->tree_root;
Josef Bacik73f73412009-12-04 17:38:27 +0000546 struct btrfs_root *new_root;
547 struct btrfs_dir_item *di;
548 struct btrfs_path *path;
549 struct btrfs_key location;
550 struct inode *inode;
Josef Bacik73f73412009-12-04 17:38:27 +0000551 u64 dir_id;
552 int new = 0;
553
554 /*
555 * We have a specific subvol we want to mount, just setup location and
556 * go look up the root.
557 */
558 if (subvol_objectid) {
559 location.objectid = subvol_objectid;
560 location.type = BTRFS_ROOT_ITEM_KEY;
561 location.offset = (u64)-1;
562 goto find_root;
563 }
564
565 path = btrfs_alloc_path();
566 if (!path)
567 return ERR_PTR(-ENOMEM);
568 path->leave_spinning = 1;
569
570 /*
571 * Find the "default" dir item which points to the root item that we
572 * will mount by default if we haven't been given a specific subvolume
573 * to mount.
574 */
Al Viro815745c2011-11-17 15:40:49 -0500575 dir_id = btrfs_super_root_dir(fs_info->super_copy);
Josef Bacik73f73412009-12-04 17:38:27 +0000576 di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0);
Julia Lawallb0839162011-05-14 07:10:51 +0000577 if (IS_ERR(di)) {
578 btrfs_free_path(path);
Dan Carpenterfb4f6f92010-05-29 09:40:57 +0000579 return ERR_CAST(di);
Julia Lawallb0839162011-05-14 07:10:51 +0000580 }
Josef Bacik73f73412009-12-04 17:38:27 +0000581 if (!di) {
582 /*
583 * Ok the default dir item isn't there. This is weird since
584 * it's always been there, but don't freak out, just try and
585 * mount to root most subvolume.
586 */
587 btrfs_free_path(path);
588 dir_id = BTRFS_FIRST_FREE_OBJECTID;
Al Viro815745c2011-11-17 15:40:49 -0500589 new_root = fs_info->fs_root;
Josef Bacik73f73412009-12-04 17:38:27 +0000590 goto setup_root;
591 }
592
593 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location);
594 btrfs_free_path(path);
595
596find_root:
Al Viro815745c2011-11-17 15:40:49 -0500597 new_root = btrfs_read_fs_root_no_name(fs_info, &location);
Josef Bacik73f73412009-12-04 17:38:27 +0000598 if (IS_ERR(new_root))
Julia Lawalld0b678c2010-10-29 15:14:23 -0400599 return ERR_CAST(new_root);
Josef Bacik73f73412009-12-04 17:38:27 +0000600
601 if (btrfs_root_refs(&new_root->root_item) == 0)
602 return ERR_PTR(-ENOENT);
603
604 dir_id = btrfs_root_dirid(&new_root->root_item);
605setup_root:
606 location.objectid = dir_id;
607 location.type = BTRFS_INODE_ITEM_KEY;
608 location.offset = 0;
609
610 inode = btrfs_iget(sb, &location, new_root, &new);
Dan Carpenter4cbd1142010-05-29 09:42:19 +0000611 if (IS_ERR(inode))
612 return ERR_CAST(inode);
Josef Bacik73f73412009-12-04 17:38:27 +0000613
614 /*
615 * If we're just mounting the root most subvol put the inode and return
616 * a reference to the dentry. We will have already gotten a reference
617 * to the inode in btrfs_fill_super so we're good to go.
618 */
619 if (!new && sb->s_root->d_inode == inode) {
620 iput(inode);
621 return dget(sb->s_root);
622 }
623
Josef Bacikba5b8952011-07-25 15:40:35 -0400624 return d_obtain_alias(inode);
Josef Bacik73f73412009-12-04 17:38:27 +0000625}
626
Chris Masond3977122009-01-05 21:25:51 -0500627static int btrfs_fill_super(struct super_block *sb,
Chris Mason8a4b83c2008-03-24 15:02:07 -0400628 struct btrfs_fs_devices *fs_devices,
Chris Masond3977122009-01-05 21:25:51 -0500629 void *data, int silent)
Chris Mason2e635a22007-03-21 11:12:56 -0400630{
Chris Masond3977122009-01-05 21:25:51 -0500631 struct inode *inode;
632 struct dentry *root_dentry;
Al Viro815745c2011-11-17 15:40:49 -0500633 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400634 struct btrfs_key key;
Chris Mason39279cc2007-06-12 06:35:45 -0400635 int err;
Chris Mason2e635a22007-03-21 11:12:56 -0400636
637 sb->s_maxbytes = MAX_LFS_FILESIZE;
Chris Mason2e635a22007-03-21 11:12:56 -0400638 sb->s_magic = BTRFS_SUPER_MAGIC;
Chris Masone20d96d2007-03-22 12:13:20 -0400639 sb->s_op = &btrfs_super_ops;
Al Viroaf53d292010-12-20 10:56:06 -0500640 sb->s_d_op = &btrfs_dentry_operations;
Balaji Raobe6e8dc2008-07-21 02:01:56 +0530641 sb->s_export_op = &btrfs_export_ops;
Josef Bacik5103e942007-11-16 11:45:54 -0500642 sb->s_xattr = btrfs_xattr_handlers;
Chris Mason2e635a22007-03-21 11:12:56 -0400643 sb->s_time_gran = 1;
Chris Mason0eda2942009-10-13 13:50:18 -0400644#ifdef CONFIG_BTRFS_FS_POSIX_ACL
Josef Bacik33268ea2008-07-24 12:16:36 -0400645 sb->s_flags |= MS_POSIXACL;
Chris Ball49cf6f42009-09-29 13:51:04 -0400646#endif
Chris Masone20d96d2007-03-22 12:13:20 -0400647
Al Viroad2b2c82011-11-17 01:10:02 -0500648 err = open_ctree(sb, fs_devices, (char *)data);
649 if (err) {
Chris Masone20d96d2007-03-22 12:13:20 -0400650 printk("btrfs: open_ctree failed\n");
Al Viroad2b2c82011-11-17 01:10:02 -0500651 return err;
Chris Masone20d96d2007-03-22 12:13:20 -0400652 }
Chris Masonb888db22007-08-27 16:49:44 -0400653
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400654 key.objectid = BTRFS_FIRST_FREE_OBJECTID;
655 key.type = BTRFS_INODE_ITEM_KEY;
656 key.offset = 0;
Al Viro98c70892011-11-17 01:00:31 -0500657 inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL);
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400658 if (IS_ERR(inode)) {
659 err = PTR_ERR(inode);
Chris Mason39279cc2007-06-12 06:35:45 -0400660 goto fail_close;
661 }
Chris Mason2e635a22007-03-21 11:12:56 -0400662
Chris Masone20d96d2007-03-22 12:13:20 -0400663 root_dentry = d_alloc_root(inode);
664 if (!root_dentry) {
Chris Mason2e635a22007-03-21 11:12:56 -0400665 iput(inode);
Chris Mason39279cc2007-06-12 06:35:45 -0400666 err = -ENOMEM;
667 goto fail_close;
Chris Mason2e635a22007-03-21 11:12:56 -0400668 }
Josef Bacik58176a92007-08-29 15:47:34 -0400669
Chris Masone20d96d2007-03-22 12:13:20 -0400670 sb->s_root = root_dentry;
Chris Mason6885f302008-02-20 16:11:05 -0500671
Chris Mason6885f302008-02-20 16:11:05 -0500672 save_mount_options(sb, data);
Dan Magenheimer90a887c2011-05-26 10:01:56 -0600673 cleancache_init_fs(sb);
Al Viro59553ed2011-11-17 01:56:28 -0500674 sb->s_flags |= MS_ACTIVE;
Chris Mason2e635a22007-03-21 11:12:56 -0400675 return 0;
Chris Mason2e635a22007-03-21 11:12:56 -0400676
Chris Mason39279cc2007-06-12 06:35:45 -0400677fail_close:
Al Viro815745c2011-11-17 15:40:49 -0500678 close_ctree(fs_info->tree_root);
Chris Masond5719762007-03-23 10:01:08 -0400679 return err;
680}
681
Sage Weil6bf13c02008-06-10 10:07:39 -0400682int btrfs_sync_fs(struct super_block *sb, int wait)
Chris Masond5719762007-03-23 10:01:08 -0400683{
684 struct btrfs_trans_handle *trans;
Al Viro815745c2011-11-17 15:40:49 -0500685 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
686 struct btrfs_root *root = fs_info->tree_root;
Chris Masond5719762007-03-23 10:01:08 -0400687 int ret;
Chris Masondf2ce342007-03-23 11:00:45 -0400688
liubo1abe9b82011-03-24 11:18:59 +0000689 trace_btrfs_sync_fs(wait);
690
Chris Masond561c022007-03-23 19:47:49 -0400691 if (!wait) {
Al Viro815745c2011-11-17 15:40:49 -0500692 filemap_flush(fs_info->btree_inode->i_mapping);
Chris Masond561c022007-03-23 19:47:49 -0400693 return 0;
694 }
Chris Mason771ed682008-11-06 22:02:51 -0500695
Yan, Zheng24bbcf02009-11-12 09:36:34 +0000696 btrfs_start_delalloc_inodes(root, 0);
697 btrfs_wait_ordered_extents(root, 0, 0);
Chris Mason771ed682008-11-06 22:02:51 -0500698
Yan, Zhenga22285a2010-05-16 10:48:46 -0400699 trans = btrfs_start_transaction(root, 0);
Tsutomu Itoh98d5dc12011-01-20 06:19:37 +0000700 if (IS_ERR(trans))
701 return PTR_ERR(trans);
Chris Masond5719762007-03-23 10:01:08 -0400702 ret = btrfs_commit_transaction(trans, root);
Chris Mason54aa1f42007-06-22 14:16:25 -0400703 return ret;
Chris Masond5719762007-03-23 10:01:08 -0400704}
705
Al Viro34c80b12011-12-08 21:32:45 -0500706static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
Eric Parisa9572a12009-04-02 16:46:06 -0400707{
Al Viro815745c2011-11-17 15:40:49 -0500708 struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb);
709 struct btrfs_root *root = info->tree_root;
Tsutomu Itoh200da642011-03-31 00:44:29 +0000710 char *compress_type;
Eric Parisa9572a12009-04-02 16:46:06 -0400711
712 if (btrfs_test_opt(root, DEGRADED))
713 seq_puts(seq, ",degraded");
714 if (btrfs_test_opt(root, NODATASUM))
715 seq_puts(seq, ",nodatasum");
716 if (btrfs_test_opt(root, NODATACOW))
717 seq_puts(seq, ",nodatacow");
718 if (btrfs_test_opt(root, NOBARRIER))
719 seq_puts(seq, ",nobarrier");
Eric Parisa9572a12009-04-02 16:46:06 -0400720 if (info->max_inline != 8192 * 1024)
Joel Becker21380932009-04-21 12:38:29 -0700721 seq_printf(seq, ",max_inline=%llu",
722 (unsigned long long)info->max_inline);
Eric Parisa9572a12009-04-02 16:46:06 -0400723 if (info->alloc_start != 0)
Joel Becker21380932009-04-21 12:38:29 -0700724 seq_printf(seq, ",alloc_start=%llu",
725 (unsigned long long)info->alloc_start);
Eric Parisa9572a12009-04-02 16:46:06 -0400726 if (info->thread_pool_size != min_t(unsigned long,
727 num_online_cpus() + 2, 8))
728 seq_printf(seq, ",thread_pool=%d", info->thread_pool_size);
Tsutomu Itoh200da642011-03-31 00:44:29 +0000729 if (btrfs_test_opt(root, COMPRESS)) {
730 if (info->compress_type == BTRFS_COMPRESS_ZLIB)
731 compress_type = "zlib";
732 else
733 compress_type = "lzo";
734 if (btrfs_test_opt(root, FORCE_COMPRESS))
735 seq_printf(seq, ",compress-force=%s", compress_type);
736 else
737 seq_printf(seq, ",compress=%s", compress_type);
738 }
Chris Masonc2898112009-06-10 09:51:32 -0400739 if (btrfs_test_opt(root, NOSSD))
740 seq_puts(seq, ",nossd");
Chris Mason451d7582009-06-09 20:28:34 -0400741 if (btrfs_test_opt(root, SSD_SPREAD))
742 seq_puts(seq, ",ssd_spread");
743 else if (btrfs_test_opt(root, SSD))
Eric Parisa9572a12009-04-02 16:46:06 -0400744 seq_puts(seq, ",ssd");
Sage Weil3a5e1402009-04-02 16:49:40 -0400745 if (btrfs_test_opt(root, NOTREELOG))
Sage Weil6b65c5c2009-05-14 13:52:21 -0400746 seq_puts(seq, ",notreelog");
Sage Weildccae992009-04-02 16:59:01 -0400747 if (btrfs_test_opt(root, FLUSHONCOMMIT))
Sage Weil6b65c5c2009-05-14 13:52:21 -0400748 seq_puts(seq, ",flushoncommit");
Matthew Wilcox20a52392009-12-14 22:01:12 +0000749 if (btrfs_test_opt(root, DISCARD))
750 seq_puts(seq, ",discard");
Eric Parisa9572a12009-04-02 16:46:06 -0400751 if (!(root->fs_info->sb->s_flags & MS_POSIXACL))
752 seq_puts(seq, ",noacl");
Tsutomu Itoh200da642011-03-31 00:44:29 +0000753 if (btrfs_test_opt(root, SPACE_CACHE))
754 seq_puts(seq, ",space_cache");
Josef Bacik73bc1872011-10-03 14:07:49 -0400755 else
David Sterba89655932011-11-11 10:14:57 -0500756 seq_puts(seq, ",nospace_cache");
Tsutomu Itoh200da642011-03-31 00:44:29 +0000757 if (btrfs_test_opt(root, CLEAR_CACHE))
758 seq_puts(seq, ",clear_cache");
759 if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED))
760 seq_puts(seq, ",user_subvol_rm_allowed");
David Sterba0942caa2011-06-28 15:10:37 +0000761 if (btrfs_test_opt(root, ENOSPC_DEBUG))
762 seq_puts(seq, ",enospc_debug");
763 if (btrfs_test_opt(root, AUTO_DEFRAG))
764 seq_puts(seq, ",autodefrag");
765 if (btrfs_test_opt(root, INODE_MAP_CACHE))
766 seq_puts(seq, ",inode_cache");
Ilya Dryomov9555c6c2012-01-16 22:04:48 +0200767 if (btrfs_test_opt(root, SKIP_BALANCE))
768 seq_puts(seq, ",skip_balance");
Eric Parisa9572a12009-04-02 16:46:06 -0400769 return 0;
770}
771
Chris Masona061fc82008-05-07 11:43:44 -0400772static int btrfs_test_super(struct super_block *s, void *data)
Chris Mason2e635a22007-03-21 11:12:56 -0400773{
Al Viro815745c2011-11-17 15:40:49 -0500774 struct btrfs_fs_info *p = data;
775 struct btrfs_fs_info *fs_info = btrfs_sb(s);
Yan4b82d6e2007-08-29 09:11:44 -0400776
Al Viro815745c2011-11-17 15:40:49 -0500777 return fs_info->fs_devices == p->fs_devices;
Yan4b82d6e2007-08-29 09:11:44 -0400778}
779
Josef Bacik450ba0e2010-11-19 14:59:15 -0500780static int btrfs_set_super(struct super_block *s, void *data)
781{
Al Viro6de1d092011-11-17 01:29:09 -0500782 int err = set_anon_super(s, data);
783 if (!err)
784 s->s_fs_info = data;
785 return err;
Josef Bacik450ba0e2010-11-19 14:59:15 -0500786}
787
Josef Bacik830c4ad2011-07-25 15:55:42 -0400788/*
David Sterbaf9d9ef62011-09-29 13:11:33 +0200789 * subvolumes are identified by ino 256
790 */
791static inline int is_subvolume_inode(struct inode *inode)
792{
793 if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
794 return 1;
795 return 0;
796}
797
798/*
Josef Bacik830c4ad2011-07-25 15:55:42 -0400799 * This will strip out the subvol=%s argument for an argument string and add
800 * subvolid=0 to make sure we get the actual tree root for path walking to the
801 * subvol we want.
802 */
803static char *setup_root_args(char *args)
804{
805 unsigned copied = 0;
806 unsigned len = strlen(args) + 2;
807 char *pos;
808 char *ret;
809
810 /*
811 * We need the same args as before, but minus
812 *
813 * subvol=a
814 *
815 * and add
816 *
817 * subvolid=0
818 *
819 * which is a difference of 2 characters, so we allocate strlen(args) +
820 * 2 characters.
821 */
822 ret = kzalloc(len * sizeof(char), GFP_NOFS);
823 if (!ret)
824 return NULL;
825 pos = strstr(args, "subvol=");
826
827 /* This shouldn't happen, but just in case.. */
828 if (!pos) {
829 kfree(ret);
830 return NULL;
831 }
832
833 /*
834 * The subvol=<> arg is not at the front of the string, copy everybody
835 * up to that into ret.
836 */
837 if (pos != args) {
838 *pos = '\0';
839 strcpy(ret, args);
840 copied += strlen(args);
841 pos++;
842 }
843
844 strncpy(ret + copied, "subvolid=0", len - copied);
845
846 /* Length of subvolid=0 */
847 copied += 10;
848
849 /*
850 * If there is no , after the subvol= option then we know there's no
851 * other options and we can just return.
852 */
853 pos = strchr(pos, ',');
854 if (!pos)
855 return ret;
856
857 /* Copy the rest of the arguments into our buffer */
858 strncpy(ret + copied, pos, len - copied);
859 copied += strlen(pos);
860
861 return ret;
862}
863
864static struct dentry *mount_subvol(const char *subvol_name, int flags,
865 const char *device_name, char *data)
866{
Josef Bacik830c4ad2011-07-25 15:55:42 -0400867 struct dentry *root;
868 struct vfsmount *mnt;
Josef Bacik830c4ad2011-07-25 15:55:42 -0400869 char *newargs;
Josef Bacik830c4ad2011-07-25 15:55:42 -0400870
871 newargs = setup_root_args(data);
872 if (!newargs)
873 return ERR_PTR(-ENOMEM);
874 mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name,
875 newargs);
876 kfree(newargs);
877 if (IS_ERR(mnt))
878 return ERR_CAST(mnt);
879
Al Viroea441d12011-11-16 21:43:59 -0500880 root = mount_subtree(mnt, subvol_name);
Josef Bacik830c4ad2011-07-25 15:55:42 -0400881
Al Viroea441d12011-11-16 21:43:59 -0500882 if (!IS_ERR(root) && !is_subvolume_inode(root->d_inode)) {
883 struct super_block *s = root->d_sb;
884 dput(root);
885 root = ERR_PTR(-EINVAL);
886 deactivate_locked_super(s);
David Sterbaf9d9ef62011-09-29 13:11:33 +0200887 printk(KERN_ERR "btrfs: '%s' is not a valid subvolume\n",
888 subvol_name);
David Sterbaf9d9ef62011-09-29 13:11:33 +0200889 }
890
Josef Bacik830c4ad2011-07-25 15:55:42 -0400891 return root;
892}
Josef Bacik450ba0e2010-11-19 14:59:15 -0500893
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400894/*
895 * Find a superblock for the given device / mount point.
896 *
897 * Note: This is based on get_sb_bdev from fs/super.c with a few additions
898 * for multiple device setup. Make sure to keep it in sync.
899 */
Al Viro061dbc62010-07-26 16:21:33 +0400900static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
David Sterba306e16c2011-04-19 14:29:38 +0200901 const char *device_name, void *data)
Yan4b82d6e2007-08-29 09:11:44 -0400902{
903 struct block_device *bdev = NULL;
904 struct super_block *s;
905 struct dentry *root;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400906 struct btrfs_fs_devices *fs_devices = NULL;
Josef Bacik450ba0e2010-11-19 14:59:15 -0500907 struct btrfs_fs_info *fs_info = NULL;
Christoph Hellwig97288f22008-12-02 06:36:09 -0500908 fmode_t mode = FMODE_READ;
Josef Bacik73f73412009-12-04 17:38:27 +0000909 char *subvol_name = NULL;
910 u64 subvol_objectid = 0;
Xin Zhonge15d0542011-04-06 07:33:51 +0000911 u64 subvol_rootid = 0;
Yan4b82d6e2007-08-29 09:11:44 -0400912 int error = 0;
913
Christoph Hellwig97288f22008-12-02 06:36:09 -0500914 if (!(flags & MS_RDONLY))
915 mode |= FMODE_WRITE;
916
917 error = btrfs_parse_early_options(data, mode, fs_type,
Josef Bacik73f73412009-12-04 17:38:27 +0000918 &subvol_name, &subvol_objectid,
Xin Zhonge15d0542011-04-06 07:33:51 +0000919 &subvol_rootid, &fs_devices);
Ilya Dryomovf23c8af2011-11-08 19:15:05 +0200920 if (error) {
921 kfree(subvol_name);
Al Viro061dbc62010-07-26 16:21:33 +0400922 return ERR_PTR(error);
Ilya Dryomovf23c8af2011-11-08 19:15:05 +0200923 }
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400924
Josef Bacik830c4ad2011-07-25 15:55:42 -0400925 if (subvol_name) {
926 root = mount_subvol(subvol_name, flags, device_name, data);
927 kfree(subvol_name);
928 return root;
929 }
930
David Sterba306e16c2011-04-19 14:29:38 +0200931 error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400932 if (error)
Josef Bacik830c4ad2011-07-25 15:55:42 -0400933 return ERR_PTR(error);
Yan4b82d6e2007-08-29 09:11:44 -0400934
Josef Bacik450ba0e2010-11-19 14:59:15 -0500935 /*
936 * Setup a dummy root and fs_info for test/set super. This is because
937 * we don't actually fill this stuff out until open_ctree, but we need
938 * it for searching for existing supers, so this lets us do that and
939 * then open_ctree will properly initialize everything later.
940 */
941 fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS);
Ilya Dryomov04d21a22011-11-09 14:41:22 +0200942 if (!fs_info)
943 return ERR_PTR(-ENOMEM);
944
Josef Bacik450ba0e2010-11-19 14:59:15 -0500945 fs_info->fs_devices = fs_devices;
Josef Bacik450ba0e2010-11-19 14:59:15 -0500946
David Sterba6c417612011-04-13 15:41:04 +0200947 fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS);
948 fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS);
949 if (!fs_info->super_copy || !fs_info->super_for_commit) {
950 error = -ENOMEM;
Ilya Dryomov04d21a22011-11-09 14:41:22 +0200951 goto error_fs_info;
952 }
953
954 error = btrfs_open_devices(fs_devices, mode, fs_type);
955 if (error)
956 goto error_fs_info;
957
958 if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) {
959 error = -EACCES;
David Sterba6c417612011-04-13 15:41:04 +0200960 goto error_close_devices;
961 }
962
Chris Masondfe25022008-05-13 13:46:40 -0400963 bdev = fs_devices->latest_bdev;
Al Viro815745c2011-11-17 15:40:49 -0500964 s = sget(fs_type, btrfs_test_super, btrfs_set_super, fs_info);
Josef Bacik830c4ad2011-07-25 15:55:42 -0400965 if (IS_ERR(s)) {
966 error = PTR_ERR(s);
967 goto error_close_devices;
968 }
Yan4b82d6e2007-08-29 09:11:44 -0400969
970 if (s->s_root) {
Yan Zheng2b820322008-11-17 21:11:30 -0500971 btrfs_close_devices(fs_devices);
David Sterba6c417612011-04-13 15:41:04 +0200972 free_fs_info(fs_info);
Al Viro59553ed2011-11-17 01:56:28 -0500973 if ((flags ^ s->s_flags) & MS_RDONLY)
974 error = -EBUSY;
Yan4b82d6e2007-08-29 09:11:44 -0400975 } else {
976 char b[BDEVNAME_SIZE];
977
Al Viro9e1f1de2011-06-03 18:24:58 -0400978 s->s_flags = flags | MS_NOSEC;
Yan4b82d6e2007-08-29 09:11:44 -0400979 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
Al Viro815745c2011-11-17 15:40:49 -0500980 btrfs_sb(s)->bdev_holder = fs_type;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400981 error = btrfs_fill_super(s, fs_devices, data,
982 flags & MS_SILENT ? 1 : 0);
Yan4b82d6e2007-08-29 09:11:44 -0400983 }
984
Al Viro59553ed2011-11-17 01:56:28 -0500985 root = !error ? get_default_root(s, subvol_objectid) : ERR_PTR(error);
986 if (IS_ERR(root))
Josef Bacik830c4ad2011-07-25 15:55:42 -0400987 deactivate_locked_super(s);
Yan4b82d6e2007-08-29 09:11:44 -0400988
Al Viro061dbc62010-07-26 16:21:33 +0400989 return root;
Yan4b82d6e2007-08-29 09:11:44 -0400990
Yan Zhengc146afa2008-11-12 14:34:12 -0500991error_close_devices:
Chris Mason8a4b83c2008-03-24 15:02:07 -0400992 btrfs_close_devices(fs_devices);
Ilya Dryomov04d21a22011-11-09 14:41:22 +0200993error_fs_info:
David Sterba6c417612011-04-13 15:41:04 +0200994 free_fs_info(fs_info);
Al Viro061dbc62010-07-26 16:21:33 +0400995 return ERR_PTR(error);
Yan4b82d6e2007-08-29 09:11:44 -0400996}
Chris Mason2e635a22007-03-21 11:12:56 -0400997
Yan Zhengc146afa2008-11-12 14:34:12 -0500998static int btrfs_remount(struct super_block *sb, int *flags, char *data)
999{
Al Viro815745c2011-11-17 15:40:49 -05001000 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
1001 struct btrfs_root *root = fs_info->tree_root;
Yan Zhengc146afa2008-11-12 14:34:12 -05001002 int ret;
1003
Chris Masonb2880522009-02-12 09:37:35 -05001004 ret = btrfs_parse_options(root, data);
1005 if (ret)
1006 return -EINVAL;
1007
Yan Zhengc146afa2008-11-12 14:34:12 -05001008 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1009 return 0;
1010
1011 if (*flags & MS_RDONLY) {
1012 sb->s_flags |= MS_RDONLY;
1013
1014 ret = btrfs_commit_super(root);
1015 WARN_ON(ret);
1016 } else {
Al Viro815745c2011-11-17 15:40:49 -05001017 if (fs_info->fs_devices->rw_devices == 0)
Yan Zheng2b820322008-11-17 21:11:30 -05001018 return -EACCES;
1019
Al Viro815745c2011-11-17 15:40:49 -05001020 if (btrfs_super_log_root(fs_info->super_copy) != 0)
Yan Zhengc146afa2008-11-12 14:34:12 -05001021 return -EINVAL;
1022
Al Viro815745c2011-11-17 15:40:49 -05001023 ret = btrfs_cleanup_fs_roots(fs_info);
Yan Zhengc146afa2008-11-12 14:34:12 -05001024 WARN_ON(ret);
1025
Yan, Zhengd68fc572010-05-16 10:49:58 -04001026 /* recover relocation */
1027 ret = btrfs_recover_relocation(root);
Yan Zhengc146afa2008-11-12 14:34:12 -05001028 WARN_ON(ret);
1029
1030 sb->s_flags &= ~MS_RDONLY;
1031 }
1032
1033 return 0;
1034}
1035
Arne Jansenbcd53742011-04-12 10:43:21 +02001036/* Used to sort the devices by max_avail(descending sort) */
1037static int btrfs_cmp_device_free_bytes(const void *dev_info1,
1038 const void *dev_info2)
1039{
1040 if (((struct btrfs_device_info *)dev_info1)->max_avail >
1041 ((struct btrfs_device_info *)dev_info2)->max_avail)
1042 return -1;
1043 else if (((struct btrfs_device_info *)dev_info1)->max_avail <
1044 ((struct btrfs_device_info *)dev_info2)->max_avail)
1045 return 1;
1046 else
1047 return 0;
1048}
1049
1050/*
1051 * sort the devices by max_avail, in which max free extent size of each device
1052 * is stored.(Descending Sort)
1053 */
1054static inline void btrfs_descending_sort_devices(
1055 struct btrfs_device_info *devices,
1056 size_t nr_devices)
1057{
1058 sort(devices, nr_devices, sizeof(struct btrfs_device_info),
1059 btrfs_cmp_device_free_bytes, NULL);
1060}
1061
Miao Xie6d07bce2011-01-05 10:07:31 +00001062/*
1063 * The helper to calc the free space on the devices that can be used to store
1064 * file data.
1065 */
1066static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes)
1067{
1068 struct btrfs_fs_info *fs_info = root->fs_info;
1069 struct btrfs_device_info *devices_info;
1070 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
1071 struct btrfs_device *device;
1072 u64 skip_space;
1073 u64 type;
1074 u64 avail_space;
1075 u64 used_space;
1076 u64 min_stripe_size;
Miao Xie39fb26c2011-12-14 20:12:02 -05001077 int min_stripes = 1, num_stripes = 1;
Miao Xie6d07bce2011-01-05 10:07:31 +00001078 int i = 0, nr_devices;
1079 int ret;
1080
Li Zefanb772a862011-11-28 16:43:00 +08001081 nr_devices = fs_info->fs_devices->open_devices;
Miao Xie6d07bce2011-01-05 10:07:31 +00001082 BUG_ON(!nr_devices);
1083
1084 devices_info = kmalloc(sizeof(*devices_info) * nr_devices,
1085 GFP_NOFS);
1086 if (!devices_info)
1087 return -ENOMEM;
1088
1089 /* calc min stripe number for data space alloction */
1090 type = btrfs_get_alloc_profile(root, 1);
Miao Xie39fb26c2011-12-14 20:12:02 -05001091 if (type & BTRFS_BLOCK_GROUP_RAID0) {
Miao Xie6d07bce2011-01-05 10:07:31 +00001092 min_stripes = 2;
Miao Xie39fb26c2011-12-14 20:12:02 -05001093 num_stripes = nr_devices;
1094 } else if (type & BTRFS_BLOCK_GROUP_RAID1) {
Miao Xie6d07bce2011-01-05 10:07:31 +00001095 min_stripes = 2;
Miao Xie39fb26c2011-12-14 20:12:02 -05001096 num_stripes = 2;
1097 } else if (type & BTRFS_BLOCK_GROUP_RAID10) {
Miao Xie6d07bce2011-01-05 10:07:31 +00001098 min_stripes = 4;
Miao Xie39fb26c2011-12-14 20:12:02 -05001099 num_stripes = 4;
1100 }
Miao Xie6d07bce2011-01-05 10:07:31 +00001101
1102 if (type & BTRFS_BLOCK_GROUP_DUP)
1103 min_stripe_size = 2 * BTRFS_STRIPE_LEN;
1104 else
1105 min_stripe_size = BTRFS_STRIPE_LEN;
1106
Li Zefanb772a862011-11-28 16:43:00 +08001107 list_for_each_entry(device, &fs_devices->devices, dev_list) {
1108 if (!device->in_fs_metadata || !device->bdev)
Miao Xie6d07bce2011-01-05 10:07:31 +00001109 continue;
1110
1111 avail_space = device->total_bytes - device->bytes_used;
1112
1113 /* align with stripe_len */
1114 do_div(avail_space, BTRFS_STRIPE_LEN);
1115 avail_space *= BTRFS_STRIPE_LEN;
1116
1117 /*
1118 * In order to avoid overwritting the superblock on the drive,
1119 * btrfs starts at an offset of at least 1MB when doing chunk
1120 * allocation.
1121 */
1122 skip_space = 1024 * 1024;
1123
1124 /* user can set the offset in fs_info->alloc_start. */
1125 if (fs_info->alloc_start + BTRFS_STRIPE_LEN <=
1126 device->total_bytes)
1127 skip_space = max(fs_info->alloc_start, skip_space);
1128
1129 /*
1130 * btrfs can not use the free space in [0, skip_space - 1],
1131 * we must subtract it from the total. In order to implement
1132 * it, we account the used space in this range first.
1133 */
1134 ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1,
1135 &used_space);
1136 if (ret) {
1137 kfree(devices_info);
1138 return ret;
1139 }
1140
1141 /* calc the free space in [0, skip_space - 1] */
1142 skip_space -= used_space;
1143
1144 /*
1145 * we can use the free space in [0, skip_space - 1], subtract
1146 * it from the total.
1147 */
1148 if (avail_space && avail_space >= skip_space)
1149 avail_space -= skip_space;
1150 else
1151 avail_space = 0;
1152
1153 if (avail_space < min_stripe_size)
1154 continue;
1155
1156 devices_info[i].dev = device;
1157 devices_info[i].max_avail = avail_space;
1158
1159 i++;
1160 }
1161
1162 nr_devices = i;
1163
1164 btrfs_descending_sort_devices(devices_info, nr_devices);
1165
1166 i = nr_devices - 1;
1167 avail_space = 0;
1168 while (nr_devices >= min_stripes) {
Miao Xie39fb26c2011-12-14 20:12:02 -05001169 if (num_stripes > nr_devices)
1170 num_stripes = nr_devices;
1171
Miao Xie6d07bce2011-01-05 10:07:31 +00001172 if (devices_info[i].max_avail >= min_stripe_size) {
1173 int j;
1174 u64 alloc_size;
1175
Miao Xie39fb26c2011-12-14 20:12:02 -05001176 avail_space += devices_info[i].max_avail * num_stripes;
Miao Xie6d07bce2011-01-05 10:07:31 +00001177 alloc_size = devices_info[i].max_avail;
Miao Xie39fb26c2011-12-14 20:12:02 -05001178 for (j = i + 1 - num_stripes; j <= i; j++)
Miao Xie6d07bce2011-01-05 10:07:31 +00001179 devices_info[j].max_avail -= alloc_size;
1180 }
1181 i--;
1182 nr_devices--;
1183 }
1184
1185 kfree(devices_info);
1186 *free_bytes = avail_space;
1187 return 0;
1188}
1189
Chris Mason8fd17792007-04-19 21:01:03 -04001190static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
1191{
Al Viro815745c2011-11-17 15:40:49 -05001192 struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb);
1193 struct btrfs_super_block *disk_super = fs_info->super_copy;
1194 struct list_head *head = &fs_info->space_info;
Josef Bacikbd4d1082010-03-05 21:59:21 +00001195 struct btrfs_space_info *found;
1196 u64 total_used = 0;
Miao Xie6d07bce2011-01-05 10:07:31 +00001197 u64 total_free_data = 0;
Chris Masondb945352007-10-15 16:15:53 -04001198 int bits = dentry->d_sb->s_blocksize_bits;
Al Viro815745c2011-11-17 15:40:49 -05001199 __be32 *fsid = (__be32 *)fs_info->fsid;
Miao Xie6d07bce2011-01-05 10:07:31 +00001200 int ret;
Chris Mason8fd17792007-04-19 21:01:03 -04001201
Miao Xie6d07bce2011-01-05 10:07:31 +00001202 /* holding chunk_muext to avoid allocating new chunks */
Al Viro815745c2011-11-17 15:40:49 -05001203 mutex_lock(&fs_info->chunk_mutex);
Josef Bacikbd4d1082010-03-05 21:59:21 +00001204 rcu_read_lock();
Josef Bacik89a55892010-10-14 14:52:27 -04001205 list_for_each_entry_rcu(found, head, list) {
Miao Xie6d07bce2011-01-05 10:07:31 +00001206 if (found->flags & BTRFS_BLOCK_GROUP_DATA) {
1207 total_free_data += found->disk_total - found->disk_used;
1208 total_free_data -=
1209 btrfs_account_ro_block_groups_free_space(found);
1210 }
1211
Yan, Zhengb742bb82010-05-16 10:46:24 -04001212 total_used += found->disk_used;
Josef Bacik89a55892010-10-14 14:52:27 -04001213 }
Josef Bacikbd4d1082010-03-05 21:59:21 +00001214 rcu_read_unlock();
1215
Chris Mason8fd17792007-04-19 21:01:03 -04001216 buf->f_namelen = BTRFS_NAME_LEN;
Chris Masondb945352007-10-15 16:15:53 -04001217 buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits;
Josef Bacikbd4d1082010-03-05 21:59:21 +00001218 buf->f_bfree = buf->f_blocks - (total_used >> bits);
Chris Mason8fd17792007-04-19 21:01:03 -04001219 buf->f_bsize = dentry->d_sb->s_blocksize;
1220 buf->f_type = BTRFS_SUPER_MAGIC;
Miao Xie6d07bce2011-01-05 10:07:31 +00001221 buf->f_bavail = total_free_data;
Al Viro815745c2011-11-17 15:40:49 -05001222 ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data);
Miao Xie6d07bce2011-01-05 10:07:31 +00001223 if (ret) {
Al Viro815745c2011-11-17 15:40:49 -05001224 mutex_unlock(&fs_info->chunk_mutex);
Miao Xie6d07bce2011-01-05 10:07:31 +00001225 return ret;
1226 }
1227 buf->f_bavail += total_free_data;
1228 buf->f_bavail = buf->f_bavail >> bits;
Al Viro815745c2011-11-17 15:40:49 -05001229 mutex_unlock(&fs_info->chunk_mutex);
Chris Masond3977122009-01-05 21:25:51 -05001230
David Woodhouse9d036322008-08-18 12:01:52 +01001231 /* We treat it as constant endianness (it doesn't matter _which_)
Chris Masond3977122009-01-05 21:25:51 -05001232 because we want the fsid to come out the same whether mounted
David Woodhouse9d036322008-08-18 12:01:52 +01001233 on a big-endian or little-endian host */
1234 buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]);
1235 buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]);
David Woodhouse32d48fa2008-08-18 13:10:20 +01001236 /* Mask in the root object ID too, to disambiguate subvols */
1237 buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32;
1238 buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid;
1239
Chris Mason8fd17792007-04-19 21:01:03 -04001240 return 0;
1241}
Chris Masonb5133862007-04-24 11:52:22 -04001242
Al Viroaea52e12011-11-17 01:22:46 -05001243static void btrfs_kill_super(struct super_block *sb)
1244{
Al Viro815745c2011-11-17 15:40:49 -05001245 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
Al Viroaea52e12011-11-17 01:22:46 -05001246 kill_anon_super(sb);
Al Virod22ca7d2011-11-17 01:46:50 -05001247 free_fs_info(fs_info);
Al Viroaea52e12011-11-17 01:22:46 -05001248}
1249
Chris Mason2e635a22007-03-21 11:12:56 -04001250static struct file_system_type btrfs_fs_type = {
1251 .owner = THIS_MODULE,
1252 .name = "btrfs",
Al Viro061dbc62010-07-26 16:21:33 +04001253 .mount = btrfs_mount,
Al Viroaea52e12011-11-17 01:22:46 -05001254 .kill_sb = btrfs_kill_super,
Chris Mason2e635a22007-03-21 11:12:56 -04001255 .fs_flags = FS_REQUIRES_DEV,
1256};
Chris Masona9218f62008-03-24 15:02:04 -04001257
Chris Masond352ac62008-09-29 15:18:18 -04001258/*
1259 * used by btrfsctl to scan devices when no FS is mounted
1260 */
Chris Mason8a4b83c2008-03-24 15:02:07 -04001261static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
1262 unsigned long arg)
1263{
1264 struct btrfs_ioctl_vol_args *vol;
1265 struct btrfs_fs_devices *fs_devices;
Chris Masonc071fcf2009-01-16 11:59:08 -05001266 int ret = -ENOTTY;
Chris Mason8a4b83c2008-03-24 15:02:07 -04001267
Chris Masone441d542009-01-05 16:57:23 -05001268 if (!capable(CAP_SYS_ADMIN))
1269 return -EPERM;
1270
Li Zefandae7b662009-04-08 15:06:54 +08001271 vol = memdup_user((void __user *)arg, sizeof(*vol));
1272 if (IS_ERR(vol))
1273 return PTR_ERR(vol);
Chris Masonc071fcf2009-01-16 11:59:08 -05001274
Chris Mason8a4b83c2008-03-24 15:02:07 -04001275 switch (cmd) {
1276 case BTRFS_IOC_SCAN_DEV:
Christoph Hellwig97288f22008-12-02 06:36:09 -05001277 ret = btrfs_scan_one_device(vol->name, FMODE_READ,
Chris Mason8a4b83c2008-03-24 15:02:07 -04001278 &btrfs_fs_type, &fs_devices);
1279 break;
1280 }
Li Zefandae7b662009-04-08 15:06:54 +08001281
Chris Mason8a4b83c2008-03-24 15:02:07 -04001282 kfree(vol);
Linda Knippersf819d832008-06-09 22:17:11 -04001283 return ret;
Chris Mason8a4b83c2008-03-24 15:02:07 -04001284}
1285
Linus Torvalds01762602009-01-10 06:09:52 -08001286static int btrfs_freeze(struct super_block *sb)
Yaned0dab62008-01-22 12:46:56 -05001287{
Al Viro815745c2011-11-17 15:40:49 -05001288 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
1289 mutex_lock(&fs_info->transaction_kthread_mutex);
1290 mutex_lock(&fs_info->cleaner_mutex);
Linus Torvalds01762602009-01-10 06:09:52 -08001291 return 0;
Yaned0dab62008-01-22 12:46:56 -05001292}
1293
Linus Torvalds01762602009-01-10 06:09:52 -08001294static int btrfs_unfreeze(struct super_block *sb)
Yaned0dab62008-01-22 12:46:56 -05001295{
Al Viro815745c2011-11-17 15:40:49 -05001296 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
1297 mutex_unlock(&fs_info->cleaner_mutex);
1298 mutex_unlock(&fs_info->transaction_kthread_mutex);
Linus Torvalds01762602009-01-10 06:09:52 -08001299 return 0;
Yaned0dab62008-01-22 12:46:56 -05001300}
Chris Mason2e635a22007-03-21 11:12:56 -04001301
Josef Bacik22c44fe2011-11-30 10:45:38 -05001302static void btrfs_fs_dirty_inode(struct inode *inode, int flags)
1303{
1304 int ret;
1305
1306 ret = btrfs_dirty_inode(inode);
1307 if (ret)
1308 printk_ratelimited(KERN_ERR "btrfs: fail to dirty inode %Lu "
1309 "error %d\n", btrfs_ino(inode), ret);
1310}
1311
Alexey Dobriyanb87221d2009-09-21 17:01:09 -07001312static const struct super_operations btrfs_super_ops = {
Yan, Zheng76dda932009-09-21 16:00:26 -04001313 .drop_inode = btrfs_drop_inode,
Al Virobd555972010-06-07 11:35:40 -04001314 .evict_inode = btrfs_evict_inode,
Chris Masone20d96d2007-03-22 12:13:20 -04001315 .put_super = btrfs_put_super,
Chris Masond5719762007-03-23 10:01:08 -04001316 .sync_fs = btrfs_sync_fs,
Eric Parisa9572a12009-04-02 16:46:06 -04001317 .show_options = btrfs_show_options,
Chris Mason4730a4b2007-03-26 12:00:39 -04001318 .write_inode = btrfs_write_inode,
Josef Bacik22c44fe2011-11-30 10:45:38 -05001319 .dirty_inode = btrfs_fs_dirty_inode,
Chris Mason2c90e5d2007-04-02 10:50:19 -04001320 .alloc_inode = btrfs_alloc_inode,
1321 .destroy_inode = btrfs_destroy_inode,
Chris Mason8fd17792007-04-19 21:01:03 -04001322 .statfs = btrfs_statfs,
Yan Zhengc146afa2008-11-12 14:34:12 -05001323 .remount_fs = btrfs_remount,
Linus Torvalds01762602009-01-10 06:09:52 -08001324 .freeze_fs = btrfs_freeze,
1325 .unfreeze_fs = btrfs_unfreeze,
Chris Masone20d96d2007-03-22 12:13:20 -04001326};
Chris Masona9218f62008-03-24 15:02:04 -04001327
1328static const struct file_operations btrfs_ctl_fops = {
1329 .unlocked_ioctl = btrfs_control_ioctl,
1330 .compat_ioctl = btrfs_control_ioctl,
1331 .owner = THIS_MODULE,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001332 .llseek = noop_llseek,
Chris Masona9218f62008-03-24 15:02:04 -04001333};
1334
1335static struct miscdevice btrfs_misc = {
Kay Sievers578454f2010-05-20 18:07:20 +02001336 .minor = BTRFS_MINOR,
Chris Masona9218f62008-03-24 15:02:04 -04001337 .name = "btrfs-control",
1338 .fops = &btrfs_ctl_fops
1339};
1340
Kay Sievers578454f2010-05-20 18:07:20 +02001341MODULE_ALIAS_MISCDEV(BTRFS_MINOR);
1342MODULE_ALIAS("devname:btrfs-control");
1343
Chris Masona9218f62008-03-24 15:02:04 -04001344static int btrfs_interface_init(void)
1345{
1346 return misc_register(&btrfs_misc);
1347}
1348
Christoph Hellwigb2950862008-12-02 09:54:17 -05001349static void btrfs_interface_exit(void)
Chris Masona9218f62008-03-24 15:02:04 -04001350{
1351 if (misc_deregister(&btrfs_misc) < 0)
Chris Masond3977122009-01-05 21:25:51 -05001352 printk(KERN_INFO "misc_deregister failed for control device");
Chris Masona9218f62008-03-24 15:02:04 -04001353}
1354
Chris Mason2e635a22007-03-21 11:12:56 -04001355static int __init init_btrfs_fs(void)
1356{
Chris Mason2c90e5d2007-04-02 10:50:19 -04001357 int err;
Josef Bacik58176a92007-08-29 15:47:34 -04001358
1359 err = btrfs_init_sysfs();
1360 if (err)
1361 return err;
1362
Li Zefan261507a02010-12-17 14:21:50 +08001363 err = btrfs_init_compress();
Chris Mason2c90e5d2007-04-02 10:50:19 -04001364 if (err)
Chris Masona74a4b92008-06-25 16:01:31 -04001365 goto free_sysfs;
Chris Masond1310b22008-01-24 16:13:08 -05001366
Li Zefan261507a02010-12-17 14:21:50 +08001367 err = btrfs_init_cachep();
1368 if (err)
1369 goto free_compress;
1370
Chris Masond1310b22008-01-24 16:13:08 -05001371 err = extent_io_init();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -05001372 if (err)
1373 goto free_cachep;
1374
Chris Masond1310b22008-01-24 16:13:08 -05001375 err = extent_map_init();
1376 if (err)
1377 goto free_extent_io;
1378
Miao Xie16cdcec2011-04-22 18:12:22 +08001379 err = btrfs_delayed_inode_init();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -05001380 if (err)
1381 goto free_extent_map;
Chris Masonc8b97812008-10-29 14:49:59 -04001382
Miao Xie16cdcec2011-04-22 18:12:22 +08001383 err = btrfs_interface_init();
1384 if (err)
1385 goto free_delayed_inode;
1386
Chris Masona9218f62008-03-24 15:02:04 -04001387 err = register_filesystem(&btrfs_fs_type);
1388 if (err)
1389 goto unregister_ioctl;
Chris Masonb3c3da72008-07-23 12:12:13 -04001390
1391 printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION);
Wyatt Banks2f4cbe62007-11-19 10:22:33 -05001392 return 0;
1393
Chris Masona9218f62008-03-24 15:02:04 -04001394unregister_ioctl:
1395 btrfs_interface_exit();
Miao Xie16cdcec2011-04-22 18:12:22 +08001396free_delayed_inode:
1397 btrfs_delayed_inode_exit();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -05001398free_extent_map:
1399 extent_map_exit();
Chris Masond1310b22008-01-24 16:13:08 -05001400free_extent_io:
1401 extent_io_exit();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -05001402free_cachep:
1403 btrfs_destroy_cachep();
Li Zefan261507a02010-12-17 14:21:50 +08001404free_compress:
1405 btrfs_exit_compress();
Chris Masona74a4b92008-06-25 16:01:31 -04001406free_sysfs:
Wyatt Banks2f4cbe62007-11-19 10:22:33 -05001407 btrfs_exit_sysfs();
1408 return err;
Chris Mason2e635a22007-03-21 11:12:56 -04001409}
1410
1411static void __exit exit_btrfs_fs(void)
1412{
Chris Mason39279cc2007-06-12 06:35:45 -04001413 btrfs_destroy_cachep();
Miao Xie16cdcec2011-04-22 18:12:22 +08001414 btrfs_delayed_inode_exit();
Chris Masona52d9a82007-08-27 16:49:44 -04001415 extent_map_exit();
Chris Masond1310b22008-01-24 16:13:08 -05001416 extent_io_exit();
Chris Masona9218f62008-03-24 15:02:04 -04001417 btrfs_interface_exit();
Chris Mason2e635a22007-03-21 11:12:56 -04001418 unregister_filesystem(&btrfs_fs_type);
Josef Bacik58176a92007-08-29 15:47:34 -04001419 btrfs_exit_sysfs();
Chris Mason8a4b83c2008-03-24 15:02:07 -04001420 btrfs_cleanup_fs_uuids();
Li Zefan261507a02010-12-17 14:21:50 +08001421 btrfs_exit_compress();
Chris Mason2e635a22007-03-21 11:12:56 -04001422}
1423
1424module_init(init_btrfs_fs)
1425module_exit(exit_btrfs_fs)
1426
1427MODULE_LICENSE("GPL");