blob: d34b2dfc9628cde65f6181b5ed4043cf8603541c [file] [log] [blame]
Chris Mason6cbd5572007-06-12 09:07:21 -04001/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
Yan4b82d6e2007-08-29 09:11:44 -040019#include <linux/blkdev.h>
Chris Mason2e635a22007-03-21 11:12:56 -040020#include <linux/module.h>
Chris Masone20d96d2007-03-22 12:13:20 -040021#include <linux/buffer_head.h>
Chris Mason2e635a22007-03-21 11:12:56 -040022#include <linux/fs.h>
23#include <linux/pagemap.h>
24#include <linux/highmem.h>
25#include <linux/time.h>
26#include <linux/init.h>
Eric Parisa9572a12009-04-02 16:46:06 -040027#include <linux/seq_file.h>
Chris Mason2e635a22007-03-21 11:12:56 -040028#include <linux/string.h>
Chris Mason2e635a22007-03-21 11:12:56 -040029#include <linux/backing-dev.h>
Yan4b82d6e2007-08-29 09:11:44 -040030#include <linux/mount.h>
Chris Masondee26a92007-03-26 16:00:06 -040031#include <linux/mpage.h>
Chris Mason75dfe392007-03-29 11:56:46 -040032#include <linux/swap.h>
33#include <linux/writeback.h>
Chris Mason8fd17792007-04-19 21:01:03 -040034#include <linux/statfs.h>
Chris Mason08607c12007-06-08 15:33:54 -040035#include <linux/compat.h>
Chris Mason95e05282007-08-29 09:11:44 -040036#include <linux/parser.h>
Chris Masonc59f8952007-12-17 20:14:04 -050037#include <linux/ctype.h>
Chris Mason6da6aba2007-12-18 16:15:09 -050038#include <linux/namei.h>
Chris Masona9218f62008-03-24 15:02:04 -040039#include <linux/miscdevice.h>
Qinghuang Feng1bcbf312009-01-15 13:51:03 -080040#include <linux/magic.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090041#include <linux/slab.h>
Chris Mason4b4e25f2008-11-20 10:22:27 -050042#include "compat.h"
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
Alexey Dobriyanb87221d2009-09-21 17:01:09 -070055static const 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 {
Josef Bacik73f73412009-12-04 17:38:27 +000067 Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum,
Josef Bacik287a0ab2010-03-19 18:07:23 +000068 Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd,
69 Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress,
70 Opt_compress_force, Opt_notreelog, Opt_ratio, Opt_flushoncommit,
Christoph Hellwige244a0a2009-10-14 09:24:59 -040071 Opt_discard, Opt_err,
Chris Mason95e05282007-08-29 09:11:44 -040072};
73
74static match_table_t tokens = {
Chris Masondfe25022008-05-13 13:46:40 -040075 {Opt_degraded, "degraded"},
Chris Mason95e05282007-08-29 09:11:44 -040076 {Opt_subvol, "subvol=%s"},
Josef Bacik73f73412009-12-04 17:38:27 +000077 {Opt_subvolid, "subvolid=%d"},
Christoph Hellwig43e570b2008-06-10 10:40:46 -040078 {Opt_device, "device=%s"},
Chris Masonb6cda9b2007-12-14 15:30:32 -050079 {Opt_nodatasum, "nodatasum"},
Chris Masonbe20aa92007-12-17 20:14:01 -050080 {Opt_nodatacow, "nodatacow"},
Chris Mason21ad10c2008-01-09 09:23:21 -050081 {Opt_nobarrier, "nobarrier"},
Chris Mason6f568d32008-01-29 16:03:38 -050082 {Opt_max_inline, "max_inline=%s"},
Chris Mason8f662a72008-01-02 10:01:11 -050083 {Opt_alloc_start, "alloc_start=%s"},
Chris Mason4543df72008-06-11 21:47:56 -040084 {Opt_thread_pool, "thread_pool=%d"},
Chris Masonc8b97812008-10-29 14:49:59 -040085 {Opt_compress, "compress"},
Chris Masona555f812010-01-28 16:18:15 -050086 {Opt_compress_force, "compress-force"},
Chris Masone18e4802008-01-18 10:54:22 -050087 {Opt_ssd, "ssd"},
Chris Mason451d7582009-06-09 20:28:34 -040088 {Opt_ssd_spread, "ssd_spread"},
Chris Mason3b30c222009-06-09 16:42:22 -040089 {Opt_nossd, "nossd"},
Josef Bacik33268ea2008-07-24 12:16:36 -040090 {Opt_noacl, "noacl"},
Sage Weil3a5e1402009-04-02 16:49:40 -040091 {Opt_notreelog, "notreelog"},
Sage Weildccae992009-04-02 16:59:01 -040092 {Opt_flushoncommit, "flushoncommit"},
Josef Bacik97e728d2009-04-21 17:40:57 -040093 {Opt_ratio, "metadata_ratio=%d"},
Christoph Hellwige244a0a2009-10-14 09:24:59 -040094 {Opt_discard, "discard"},
Josef Bacik33268ea2008-07-24 12:16:36 -040095 {Opt_err, NULL},
Chris Mason95e05282007-08-29 09:11:44 -040096};
97
Christoph Hellwigedf24ab2008-06-10 10:40:29 -040098/*
99 * Regular mount options parser. Everything that is needed only when
100 * reading in a new superblock is parsed here.
101 */
102int btrfs_parse_options(struct btrfs_root *root, char *options)
Chris Mason95e05282007-08-29 09:11:44 -0400103{
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400104 struct btrfs_fs_info *info = root->fs_info;
Chris Mason95e05282007-08-29 09:11:44 -0400105 substring_t args[MAX_OPT_ARGS];
Josef Bacikda495ec2010-02-25 20:38:35 +0000106 char *p, *num, *orig;
Chris Mason4543df72008-06-11 21:47:56 -0400107 int intarg;
Sage Weila7a3f7c2009-11-07 06:19:16 +0000108 int ret = 0;
Chris Masonb6cda9b2007-12-14 15:30:32 -0500109
Chris Mason95e05282007-08-29 09:11:44 -0400110 if (!options)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400111 return 0;
Chris Mason95e05282007-08-29 09:11:44 -0400112
Chris Masonbe20aa92007-12-17 20:14:01 -0500113 /*
114 * strsep changes the string, duplicate it because parse_options
115 * gets called twice
116 */
117 options = kstrdup(options, GFP_NOFS);
118 if (!options)
119 return -ENOMEM;
120
Josef Bacikda495ec2010-02-25 20:38:35 +0000121 orig = options;
Chris Masonbe20aa92007-12-17 20:14:01 -0500122
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400123 while ((p = strsep(&options, ",")) != NULL) {
Chris Mason95e05282007-08-29 09:11:44 -0400124 int token;
125 if (!*p)
126 continue;
127
128 token = match_token(p, tokens, args);
129 switch (token) {
Chris Masondfe25022008-05-13 13:46:40 -0400130 case Opt_degraded:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400131 printk(KERN_INFO "btrfs: allowing degraded mounts\n");
132 btrfs_set_opt(info->mount_opt, DEGRADED);
Chris Masondfe25022008-05-13 13:46:40 -0400133 break;
Chris Mason95e05282007-08-29 09:11:44 -0400134 case Opt_subvol:
Josef Bacik73f73412009-12-04 17:38:27 +0000135 case Opt_subvolid:
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400136 case Opt_device:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400137 /*
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400138 * These are parsed by btrfs_parse_early_options
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400139 * and can be happily ignored here.
140 */
Chris Masonb6cda9b2007-12-14 15:30:32 -0500141 break;
142 case Opt_nodatasum:
Chris Mason067c28a2009-06-11 09:30:13 -0400143 printk(KERN_INFO "btrfs: setting nodatasum\n");
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400144 btrfs_set_opt(info->mount_opt, NODATASUM);
Chris Masonbe20aa92007-12-17 20:14:01 -0500145 break;
146 case Opt_nodatacow:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400147 printk(KERN_INFO "btrfs: setting nodatacow\n");
148 btrfs_set_opt(info->mount_opt, NODATACOW);
149 btrfs_set_opt(info->mount_opt, NODATASUM);
Chris Mason95e05282007-08-29 09:11:44 -0400150 break;
Chris Masonc8b97812008-10-29 14:49:59 -0400151 case Opt_compress:
152 printk(KERN_INFO "btrfs: use compression\n");
153 btrfs_set_opt(info->mount_opt, COMPRESS);
154 break;
Chris Masona555f812010-01-28 16:18:15 -0500155 case Opt_compress_force:
156 printk(KERN_INFO "btrfs: forcing compression\n");
157 btrfs_set_opt(info->mount_opt, FORCE_COMPRESS);
158 btrfs_set_opt(info->mount_opt, COMPRESS);
159 break;
Chris Masone18e4802008-01-18 10:54:22 -0500160 case Opt_ssd:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400161 printk(KERN_INFO "btrfs: use ssd allocation scheme\n");
162 btrfs_set_opt(info->mount_opt, SSD);
Chris Masone18e4802008-01-18 10:54:22 -0500163 break;
Chris Mason451d7582009-06-09 20:28:34 -0400164 case Opt_ssd_spread:
165 printk(KERN_INFO "btrfs: use spread ssd "
166 "allocation scheme\n");
167 btrfs_set_opt(info->mount_opt, SSD);
168 btrfs_set_opt(info->mount_opt, SSD_SPREAD);
169 break;
Chris Mason3b30c222009-06-09 16:42:22 -0400170 case Opt_nossd:
Chris Mason451d7582009-06-09 20:28:34 -0400171 printk(KERN_INFO "btrfs: not using ssd allocation "
172 "scheme\n");
Chris Masonc2898112009-06-10 09:51:32 -0400173 btrfs_set_opt(info->mount_opt, NOSSD);
Chris Mason3b30c222009-06-09 16:42:22 -0400174 btrfs_clear_opt(info->mount_opt, SSD);
Chris Mason451d7582009-06-09 20:28:34 -0400175 btrfs_clear_opt(info->mount_opt, SSD_SPREAD);
Chris Mason3b30c222009-06-09 16:42:22 -0400176 break;
Chris Mason21ad10c2008-01-09 09:23:21 -0500177 case Opt_nobarrier:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400178 printk(KERN_INFO "btrfs: turning off barriers\n");
179 btrfs_set_opt(info->mount_opt, NOBARRIER);
Chris Mason21ad10c2008-01-09 09:23:21 -0500180 break;
Chris Mason4543df72008-06-11 21:47:56 -0400181 case Opt_thread_pool:
182 intarg = 0;
183 match_int(&args[0], &intarg);
184 if (intarg) {
185 info->thread_pool_size = intarg;
186 printk(KERN_INFO "btrfs: thread pool %d\n",
187 info->thread_pool_size);
188 }
189 break;
Chris Mason6f568d32008-01-29 16:03:38 -0500190 case Opt_max_inline:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400191 num = match_strdup(&args[0]);
192 if (num) {
Akinobu Mita91748462010-02-28 10:59:11 +0000193 info->max_inline = memparse(num, NULL);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400194 kfree(num);
Chris Mason6f568d32008-01-29 16:03:38 -0500195
Chris Mason15ada042008-06-11 16:51:38 -0400196 if (info->max_inline) {
197 info->max_inline = max_t(u64,
198 info->max_inline,
199 root->sectorsize);
200 }
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400201 printk(KERN_INFO "btrfs: max_inline at %llu\n",
Joel Becker21380932009-04-21 12:38:29 -0700202 (unsigned long long)info->max_inline);
Chris Mason6f568d32008-01-29 16:03:38 -0500203 }
204 break;
Chris Mason8f662a72008-01-02 10:01:11 -0500205 case Opt_alloc_start:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400206 num = match_strdup(&args[0]);
207 if (num) {
Akinobu Mita91748462010-02-28 10:59:11 +0000208 info->alloc_start = memparse(num, NULL);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400209 kfree(num);
210 printk(KERN_INFO
211 "btrfs: allocations start at %llu\n",
Joel Becker21380932009-04-21 12:38:29 -0700212 (unsigned long long)info->alloc_start);
Chris Mason8f662a72008-01-02 10:01:11 -0500213 }
214 break;
Josef Bacik33268ea2008-07-24 12:16:36 -0400215 case Opt_noacl:
216 root->fs_info->sb->s_flags &= ~MS_POSIXACL;
217 break;
Sage Weil3a5e1402009-04-02 16:49:40 -0400218 case Opt_notreelog:
219 printk(KERN_INFO "btrfs: disabling tree log\n");
220 btrfs_set_opt(info->mount_opt, NOTREELOG);
221 break;
Sage Weildccae992009-04-02 16:59:01 -0400222 case Opt_flushoncommit:
223 printk(KERN_INFO "btrfs: turning on flush-on-commit\n");
224 btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT);
225 break;
Josef Bacik97e728d2009-04-21 17:40:57 -0400226 case Opt_ratio:
227 intarg = 0;
228 match_int(&args[0], &intarg);
229 if (intarg) {
230 info->metadata_ratio = intarg;
231 printk(KERN_INFO "btrfs: metadata ratio %d\n",
232 info->metadata_ratio);
233 }
234 break;
Christoph Hellwige244a0a2009-10-14 09:24:59 -0400235 case Opt_discard:
236 btrfs_set_opt(info->mount_opt, DISCARD);
237 break;
Sage Weila7a3f7c2009-11-07 06:19:16 +0000238 case Opt_err:
239 printk(KERN_INFO "btrfs: unrecognized mount option "
240 "'%s'\n", p);
241 ret = -EINVAL;
242 goto out;
Chris Mason95e05282007-08-29 09:11:44 -0400243 default:
Chris Masonbe20aa92007-12-17 20:14:01 -0500244 break;
Chris Mason95e05282007-08-29 09:11:44 -0400245 }
246 }
Sage Weila7a3f7c2009-11-07 06:19:16 +0000247out:
Josef Bacikda495ec2010-02-25 20:38:35 +0000248 kfree(orig);
Sage Weila7a3f7c2009-11-07 06:19:16 +0000249 return ret;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400250}
251
252/*
253 * Parse mount options that are required early in the mount process.
254 *
255 * All other options will be parsed on much later in the mount process and
256 * only when we need to allocate a new super block.
257 */
Christoph Hellwig97288f22008-12-02 06:36:09 -0500258static int btrfs_parse_early_options(const char *options, fmode_t flags,
Josef Bacik73f73412009-12-04 17:38:27 +0000259 void *holder, char **subvol_name, u64 *subvol_objectid,
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400260 struct btrfs_fs_devices **fs_devices)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400261{
262 substring_t args[MAX_OPT_ARGS];
263 char *opts, *p;
264 int error = 0;
Josef Bacik73f73412009-12-04 17:38:27 +0000265 int intarg;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400266
267 if (!options)
268 goto out;
269
270 /*
271 * strsep changes the string, duplicate it because parse_options
272 * gets called twice
273 */
274 opts = kstrdup(options, GFP_KERNEL);
275 if (!opts)
276 return -ENOMEM;
277
278 while ((p = strsep(&opts, ",")) != NULL) {
279 int token;
280 if (!*p)
281 continue;
282
283 token = match_token(p, tokens, args);
284 switch (token) {
285 case Opt_subvol:
286 *subvol_name = match_strdup(&args[0]);
287 break;
Josef Bacik73f73412009-12-04 17:38:27 +0000288 case Opt_subvolid:
289 intarg = 0;
Josef Bacik4849f01d2009-12-14 19:18:38 +0000290 error = match_int(&args[0], &intarg);
291 if (!error) {
292 /* we want the original fs_tree */
293 if (!intarg)
294 *subvol_objectid =
295 BTRFS_FS_TREE_OBJECTID;
296 else
297 *subvol_objectid = intarg;
298 }
Josef Bacik73f73412009-12-04 17:38:27 +0000299 break;
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400300 case Opt_device:
301 error = btrfs_scan_one_device(match_strdup(&args[0]),
302 flags, holder, fs_devices);
303 if (error)
304 goto out_free_opts;
305 break;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400306 default:
307 break;
308 }
309 }
310
Christoph Hellwig43e570b2008-06-10 10:40:46 -0400311 out_free_opts:
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400312 kfree(opts);
313 out:
314 /*
315 * If no subvolume name is specified we use the default one. Allocate
Chris Mason3de45862008-11-17 21:02:50 -0500316 * a copy of the string "." here so that code later in the
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400317 * mount path doesn't care if it's the default volume or another one.
318 */
319 if (!*subvol_name) {
Chris Mason3de45862008-11-17 21:02:50 -0500320 *subvol_name = kstrdup(".", GFP_KERNEL);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400321 if (!*subvol_name)
322 return -ENOMEM;
323 }
324 return error;
Chris Mason95e05282007-08-29 09:11:44 -0400325}
326
Josef Bacik73f73412009-12-04 17:38:27 +0000327static struct dentry *get_default_root(struct super_block *sb,
328 u64 subvol_objectid)
329{
330 struct btrfs_root *root = sb->s_fs_info;
331 struct btrfs_root *new_root;
332 struct btrfs_dir_item *di;
333 struct btrfs_path *path;
334 struct btrfs_key location;
335 struct inode *inode;
336 struct dentry *dentry;
337 u64 dir_id;
338 int new = 0;
339
340 /*
341 * We have a specific subvol we want to mount, just setup location and
342 * go look up the root.
343 */
344 if (subvol_objectid) {
345 location.objectid = subvol_objectid;
346 location.type = BTRFS_ROOT_ITEM_KEY;
347 location.offset = (u64)-1;
348 goto find_root;
349 }
350
351 path = btrfs_alloc_path();
352 if (!path)
353 return ERR_PTR(-ENOMEM);
354 path->leave_spinning = 1;
355
356 /*
357 * Find the "default" dir item which points to the root item that we
358 * will mount by default if we haven't been given a specific subvolume
359 * to mount.
360 */
361 dir_id = btrfs_super_root_dir(&root->fs_info->super_copy);
362 di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0);
363 if (!di) {
364 /*
365 * Ok the default dir item isn't there. This is weird since
366 * it's always been there, but don't freak out, just try and
367 * mount to root most subvolume.
368 */
369 btrfs_free_path(path);
370 dir_id = BTRFS_FIRST_FREE_OBJECTID;
371 new_root = root->fs_info->fs_root;
372 goto setup_root;
373 }
374
375 btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location);
376 btrfs_free_path(path);
377
378find_root:
379 new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
380 if (IS_ERR(new_root))
381 return ERR_PTR(PTR_ERR(new_root));
382
383 if (btrfs_root_refs(&new_root->root_item) == 0)
384 return ERR_PTR(-ENOENT);
385
386 dir_id = btrfs_root_dirid(&new_root->root_item);
387setup_root:
388 location.objectid = dir_id;
389 location.type = BTRFS_INODE_ITEM_KEY;
390 location.offset = 0;
391
392 inode = btrfs_iget(sb, &location, new_root, &new);
393 if (!inode)
394 return ERR_PTR(-ENOMEM);
395
396 /*
397 * If we're just mounting the root most subvol put the inode and return
398 * a reference to the dentry. We will have already gotten a reference
399 * to the inode in btrfs_fill_super so we're good to go.
400 */
401 if (!new && sb->s_root->d_inode == inode) {
402 iput(inode);
403 return dget(sb->s_root);
404 }
405
406 if (new) {
407 const struct qstr name = { .name = "/", .len = 1 };
408
409 /*
410 * New inode, we need to make the dentry a sibling of s_root so
411 * everything gets cleaned up properly on unmount.
412 */
413 dentry = d_alloc(sb->s_root, &name);
414 if (!dentry) {
415 iput(inode);
416 return ERR_PTR(-ENOMEM);
417 }
418 d_splice_alias(inode, dentry);
419 } else {
420 /*
421 * We found the inode in cache, just find a dentry for it and
422 * put the reference to the inode we just got.
423 */
424 dentry = d_find_alias(inode);
425 iput(inode);
426 }
427
428 return dentry;
429}
430
Chris Masond3977122009-01-05 21:25:51 -0500431static int btrfs_fill_super(struct super_block *sb,
Chris Mason8a4b83c2008-03-24 15:02:07 -0400432 struct btrfs_fs_devices *fs_devices,
Chris Masond3977122009-01-05 21:25:51 -0500433 void *data, int silent)
Chris Mason2e635a22007-03-21 11:12:56 -0400434{
Chris Masond3977122009-01-05 21:25:51 -0500435 struct inode *inode;
436 struct dentry *root_dentry;
Chris Masone20d96d2007-03-22 12:13:20 -0400437 struct btrfs_super_block *disk_super;
Chris Mason0f7d52f2007-04-09 10:42:37 -0400438 struct btrfs_root *tree_root;
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400439 struct btrfs_key key;
Chris Mason39279cc2007-06-12 06:35:45 -0400440 int err;
Chris Mason2e635a22007-03-21 11:12:56 -0400441
442 sb->s_maxbytes = MAX_LFS_FILESIZE;
Chris Mason2e635a22007-03-21 11:12:56 -0400443 sb->s_magic = BTRFS_SUPER_MAGIC;
Chris Masone20d96d2007-03-22 12:13:20 -0400444 sb->s_op = &btrfs_super_ops;
Balaji Raobe6e8dc2008-07-21 02:01:56 +0530445 sb->s_export_op = &btrfs_export_ops;
Josef Bacik5103e942007-11-16 11:45:54 -0500446 sb->s_xattr = btrfs_xattr_handlers;
Chris Mason2e635a22007-03-21 11:12:56 -0400447 sb->s_time_gran = 1;
Chris Mason0eda2942009-10-13 13:50:18 -0400448#ifdef CONFIG_BTRFS_FS_POSIX_ACL
Josef Bacik33268ea2008-07-24 12:16:36 -0400449 sb->s_flags |= MS_POSIXACL;
Chris Ball49cf6f42009-09-29 13:51:04 -0400450#endif
Chris Masone20d96d2007-03-22 12:13:20 -0400451
Chris Masondfe25022008-05-13 13:46:40 -0400452 tree_root = open_ctree(sb, fs_devices, (char *)data);
Chris Masond98237b2007-03-28 13:57:48 -0400453
Yane58ca022008-04-01 11:21:34 -0400454 if (IS_ERR(tree_root)) {
Chris Masone20d96d2007-03-22 12:13:20 -0400455 printk("btrfs: open_ctree failed\n");
Yane58ca022008-04-01 11:21:34 -0400456 return PTR_ERR(tree_root);
Chris Masone20d96d2007-03-22 12:13:20 -0400457 }
Chris Mason0f7d52f2007-04-09 10:42:37 -0400458 sb->s_fs_info = tree_root;
Chris Mason5f39d392007-10-15 16:14:19 -0400459 disk_super = &tree_root->fs_info->super_copy;
Chris Masonb888db22007-08-27 16:49:44 -0400460
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400461 key.objectid = BTRFS_FIRST_FREE_OBJECTID;
462 key.type = BTRFS_INODE_ITEM_KEY;
463 key.offset = 0;
Josef Bacik73f73412009-12-04 17:38:27 +0000464 inode = btrfs_iget(sb, &key, tree_root->fs_info->fs_root, NULL);
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400465 if (IS_ERR(inode)) {
466 err = PTR_ERR(inode);
Chris Mason39279cc2007-06-12 06:35:45 -0400467 goto fail_close;
468 }
Chris Mason2e635a22007-03-21 11:12:56 -0400469
Chris Masone20d96d2007-03-22 12:13:20 -0400470 root_dentry = d_alloc_root(inode);
471 if (!root_dentry) {
Chris Mason2e635a22007-03-21 11:12:56 -0400472 iput(inode);
Chris Mason39279cc2007-06-12 06:35:45 -0400473 err = -ENOMEM;
474 goto fail_close;
Chris Mason2e635a22007-03-21 11:12:56 -0400475 }
Josef Bacik58176a92007-08-29 15:47:34 -0400476
Chris Masone20d96d2007-03-22 12:13:20 -0400477 sb->s_root = root_dentry;
Chris Mason6885f302008-02-20 16:11:05 -0500478
Chris Mason6885f302008-02-20 16:11:05 -0500479 save_mount_options(sb, data);
Chris Mason2e635a22007-03-21 11:12:56 -0400480 return 0;
Chris Mason2e635a22007-03-21 11:12:56 -0400481
Chris Mason39279cc2007-06-12 06:35:45 -0400482fail_close:
483 close_ctree(tree_root);
Chris Masond5719762007-03-23 10:01:08 -0400484 return err;
485}
486
Sage Weil6bf13c02008-06-10 10:07:39 -0400487int btrfs_sync_fs(struct super_block *sb, int wait)
Chris Masond5719762007-03-23 10:01:08 -0400488{
489 struct btrfs_trans_handle *trans;
Sage Weildccae992009-04-02 16:59:01 -0400490 struct btrfs_root *root = btrfs_sb(sb);
Chris Masond5719762007-03-23 10:01:08 -0400491 int ret;
Chris Masondf2ce342007-03-23 11:00:45 -0400492
Chris Masond561c022007-03-23 19:47:49 -0400493 if (!wait) {
Chris Mason7cfcc172007-04-02 14:53:59 -0400494 filemap_flush(root->fs_info->btree_inode->i_mapping);
Chris Masond561c022007-03-23 19:47:49 -0400495 return 0;
496 }
Chris Mason771ed682008-11-06 22:02:51 -0500497
Yan, Zheng24bbcf02009-11-12 09:36:34 +0000498 btrfs_start_delalloc_inodes(root, 0);
499 btrfs_wait_ordered_extents(root, 0, 0);
Chris Mason771ed682008-11-06 22:02:51 -0500500
Yan, Zhenga22285a2010-05-16 10:48:46 -0400501 trans = btrfs_start_transaction(root, 0);
Chris Masond5719762007-03-23 10:01:08 -0400502 ret = btrfs_commit_transaction(trans, root);
Chris Mason54aa1f42007-06-22 14:16:25 -0400503 return ret;
Chris Masond5719762007-03-23 10:01:08 -0400504}
505
Eric Parisa9572a12009-04-02 16:46:06 -0400506static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
507{
508 struct btrfs_root *root = btrfs_sb(vfs->mnt_sb);
509 struct btrfs_fs_info *info = root->fs_info;
510
511 if (btrfs_test_opt(root, DEGRADED))
512 seq_puts(seq, ",degraded");
513 if (btrfs_test_opt(root, NODATASUM))
514 seq_puts(seq, ",nodatasum");
515 if (btrfs_test_opt(root, NODATACOW))
516 seq_puts(seq, ",nodatacow");
517 if (btrfs_test_opt(root, NOBARRIER))
518 seq_puts(seq, ",nobarrier");
Eric Parisa9572a12009-04-02 16:46:06 -0400519 if (info->max_inline != 8192 * 1024)
Joel Becker21380932009-04-21 12:38:29 -0700520 seq_printf(seq, ",max_inline=%llu",
521 (unsigned long long)info->max_inline);
Eric Parisa9572a12009-04-02 16:46:06 -0400522 if (info->alloc_start != 0)
Joel Becker21380932009-04-21 12:38:29 -0700523 seq_printf(seq, ",alloc_start=%llu",
524 (unsigned long long)info->alloc_start);
Eric Parisa9572a12009-04-02 16:46:06 -0400525 if (info->thread_pool_size != min_t(unsigned long,
526 num_online_cpus() + 2, 8))
527 seq_printf(seq, ",thread_pool=%d", info->thread_pool_size);
528 if (btrfs_test_opt(root, COMPRESS))
529 seq_puts(seq, ",compress");
Chris Masonc2898112009-06-10 09:51:32 -0400530 if (btrfs_test_opt(root, NOSSD))
531 seq_puts(seq, ",nossd");
Chris Mason451d7582009-06-09 20:28:34 -0400532 if (btrfs_test_opt(root, SSD_SPREAD))
533 seq_puts(seq, ",ssd_spread");
534 else if (btrfs_test_opt(root, SSD))
Eric Parisa9572a12009-04-02 16:46:06 -0400535 seq_puts(seq, ",ssd");
Sage Weil3a5e1402009-04-02 16:49:40 -0400536 if (btrfs_test_opt(root, NOTREELOG))
Sage Weil6b65c5c2009-05-14 13:52:21 -0400537 seq_puts(seq, ",notreelog");
Sage Weildccae992009-04-02 16:59:01 -0400538 if (btrfs_test_opt(root, FLUSHONCOMMIT))
Sage Weil6b65c5c2009-05-14 13:52:21 -0400539 seq_puts(seq, ",flushoncommit");
Matthew Wilcox20a52392009-12-14 22:01:12 +0000540 if (btrfs_test_opt(root, DISCARD))
541 seq_puts(seq, ",discard");
Eric Parisa9572a12009-04-02 16:46:06 -0400542 if (!(root->fs_info->sb->s_flags & MS_POSIXACL))
543 seq_puts(seq, ",noacl");
544 return 0;
545}
546
Chris Masona061fc82008-05-07 11:43:44 -0400547static int btrfs_test_super(struct super_block *s, void *data)
Chris Mason2e635a22007-03-21 11:12:56 -0400548{
Chris Masona061fc82008-05-07 11:43:44 -0400549 struct btrfs_fs_devices *test_fs_devices = data;
550 struct btrfs_root *root = btrfs_sb(s);
Yan4b82d6e2007-08-29 09:11:44 -0400551
Chris Masona061fc82008-05-07 11:43:44 -0400552 return root->fs_info->fs_devices == test_fs_devices;
Yan4b82d6e2007-08-29 09:11:44 -0400553}
554
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400555/*
556 * Find a superblock for the given device / mount point.
557 *
558 * Note: This is based on get_sb_bdev from fs/super.c with a few additions
559 * for multiple device setup. Make sure to keep it in sync.
560 */
561static int btrfs_get_sb(struct file_system_type *fs_type, int flags,
562 const char *dev_name, void *data, struct vfsmount *mnt)
Yan4b82d6e2007-08-29 09:11:44 -0400563{
564 struct block_device *bdev = NULL;
565 struct super_block *s;
566 struct dentry *root;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400567 struct btrfs_fs_devices *fs_devices = NULL;
Christoph Hellwig97288f22008-12-02 06:36:09 -0500568 fmode_t mode = FMODE_READ;
Josef Bacik73f73412009-12-04 17:38:27 +0000569 char *subvol_name = NULL;
570 u64 subvol_objectid = 0;
Yan4b82d6e2007-08-29 09:11:44 -0400571 int error = 0;
Josef Bacik73f73412009-12-04 17:38:27 +0000572 int found = 0;
Yan4b82d6e2007-08-29 09:11:44 -0400573
Christoph Hellwig97288f22008-12-02 06:36:09 -0500574 if (!(flags & MS_RDONLY))
575 mode |= FMODE_WRITE;
576
577 error = btrfs_parse_early_options(data, mode, fs_type,
Josef Bacik73f73412009-12-04 17:38:27 +0000578 &subvol_name, &subvol_objectid,
579 &fs_devices);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400580 if (error)
Shen Feng1f483662009-01-05 15:43:42 -0500581 return error;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400582
Christoph Hellwig97288f22008-12-02 06:36:09 -0500583 error = btrfs_scan_one_device(dev_name, mode, fs_type, &fs_devices);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400584 if (error)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400585 goto error_free_subvol_name;
Yan4b82d6e2007-08-29 09:11:44 -0400586
Christoph Hellwig97288f22008-12-02 06:36:09 -0500587 error = btrfs_open_devices(fs_devices, mode, fs_type);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400588 if (error)
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400589 goto error_free_subvol_name;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400590
Yan Zheng2b820322008-11-17 21:11:30 -0500591 if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) {
592 error = -EACCES;
593 goto error_close_devices;
594 }
595
Chris Masondfe25022008-05-13 13:46:40 -0400596 bdev = fs_devices->latest_bdev;
Chris Masona061fc82008-05-07 11:43:44 -0400597 s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices);
Yan4b82d6e2007-08-29 09:11:44 -0400598 if (IS_ERR(s))
599 goto error_s;
600
601 if (s->s_root) {
602 if ((flags ^ s->s_flags) & MS_RDONLY) {
Al Viro6f5bbff2009-05-06 01:34:22 -0400603 deactivate_locked_super(s);
Yan4b82d6e2007-08-29 09:11:44 -0400604 error = -EBUSY;
Yan Zhengc146afa2008-11-12 14:34:12 -0500605 goto error_close_devices;
Yan4b82d6e2007-08-29 09:11:44 -0400606 }
607
Josef Bacik73f73412009-12-04 17:38:27 +0000608 found = 1;
Yan Zheng2b820322008-11-17 21:11:30 -0500609 btrfs_close_devices(fs_devices);
Yan4b82d6e2007-08-29 09:11:44 -0400610 } else {
611 char b[BDEVNAME_SIZE];
612
613 s->s_flags = flags;
614 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
Chris Mason8a4b83c2008-03-24 15:02:07 -0400615 error = btrfs_fill_super(s, fs_devices, data,
616 flags & MS_SILENT ? 1 : 0);
Yan4b82d6e2007-08-29 09:11:44 -0400617 if (error) {
Al Viro6f5bbff2009-05-06 01:34:22 -0400618 deactivate_locked_super(s);
Shen Feng1f483662009-01-05 15:43:42 -0500619 goto error_free_subvol_name;
Yan4b82d6e2007-08-29 09:11:44 -0400620 }
621
Chris Mason788f20e2008-04-28 15:29:42 -0400622 btrfs_sb(s)->fs_info->bdev_holder = fs_type;
Yan4b82d6e2007-08-29 09:11:44 -0400623 s->s_flags |= MS_ACTIVE;
624 }
625
Josef Bacik73f73412009-12-04 17:38:27 +0000626 root = get_default_root(s, subvol_objectid);
627 if (IS_ERR(root)) {
628 error = PTR_ERR(root);
629 deactivate_locked_super(s);
630 goto error;
631 }
632 /* if they gave us a subvolume name bind mount into that */
633 if (strcmp(subvol_name, ".")) {
634 struct dentry *new_root;
635 mutex_lock(&root->d_inode->i_mutex);
636 new_root = lookup_one_len(subvol_name, root,
Chris Masond3977122009-01-05 21:25:51 -0500637 strlen(subvol_name));
Josef Bacik73f73412009-12-04 17:38:27 +0000638 mutex_unlock(&root->d_inode->i_mutex);
Chris Masond3977122009-01-05 21:25:51 -0500639
Josef Bacik73f73412009-12-04 17:38:27 +0000640 if (IS_ERR(new_root)) {
Al Viro6f5bbff2009-05-06 01:34:22 -0400641 deactivate_locked_super(s);
Josef Bacik73f73412009-12-04 17:38:27 +0000642 error = PTR_ERR(new_root);
David Woodhouse76fcef12008-08-19 16:49:35 +0100643 dput(root);
Josef Bacik73f73412009-12-04 17:38:27 +0000644 goto error_close_devices;
645 }
646 if (!new_root->d_inode) {
647 dput(root);
648 dput(new_root);
Al Viro6f5bbff2009-05-06 01:34:22 -0400649 deactivate_locked_super(s);
David Woodhouse76fcef12008-08-19 16:49:35 +0100650 error = -ENXIO;
Josef Bacik73f73412009-12-04 17:38:27 +0000651 goto error_close_devices;
David Woodhouse76fcef12008-08-19 16:49:35 +0100652 }
Josef Bacik73f73412009-12-04 17:38:27 +0000653 dput(root);
654 root = new_root;
Yan4b82d6e2007-08-29 09:11:44 -0400655 }
656
657 mnt->mnt_sb = s;
658 mnt->mnt_root = root;
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400659
660 kfree(subvol_name);
Yan4b82d6e2007-08-29 09:11:44 -0400661 return 0;
662
663error_s:
664 error = PTR_ERR(s);
Yan Zhengc146afa2008-11-12 14:34:12 -0500665error_close_devices:
Chris Mason8a4b83c2008-03-24 15:02:07 -0400666 btrfs_close_devices(fs_devices);
Christoph Hellwigedf24ab2008-06-10 10:40:29 -0400667error_free_subvol_name:
668 kfree(subvol_name);
Josef Bacik73f73412009-12-04 17:38:27 +0000669error:
Yan4b82d6e2007-08-29 09:11:44 -0400670 return error;
671}
Chris Mason2e635a22007-03-21 11:12:56 -0400672
Yan Zhengc146afa2008-11-12 14:34:12 -0500673static int btrfs_remount(struct super_block *sb, int *flags, char *data)
674{
675 struct btrfs_root *root = btrfs_sb(sb);
676 int ret;
677
Chris Masonb2880522009-02-12 09:37:35 -0500678 ret = btrfs_parse_options(root, data);
679 if (ret)
680 return -EINVAL;
681
Yan Zhengc146afa2008-11-12 14:34:12 -0500682 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
683 return 0;
684
685 if (*flags & MS_RDONLY) {
686 sb->s_flags |= MS_RDONLY;
687
688 ret = btrfs_commit_super(root);
689 WARN_ON(ret);
690 } else {
Yan Zheng2b820322008-11-17 21:11:30 -0500691 if (root->fs_info->fs_devices->rw_devices == 0)
692 return -EACCES;
693
Yan Zhengc146afa2008-11-12 14:34:12 -0500694 if (btrfs_super_log_root(&root->fs_info->super_copy) != 0)
695 return -EINVAL;
696
Yan, Zhengd68fc572010-05-16 10:49:58 -0400697 ret = btrfs_cleanup_fs_roots(root->fs_info);
Yan Zhengc146afa2008-11-12 14:34:12 -0500698 WARN_ON(ret);
699
Yan, Zhengd68fc572010-05-16 10:49:58 -0400700 /* recover relocation */
701 ret = btrfs_recover_relocation(root);
Yan Zhengc146afa2008-11-12 14:34:12 -0500702 WARN_ON(ret);
703
704 sb->s_flags &= ~MS_RDONLY;
705 }
706
707 return 0;
708}
709
Chris Mason8fd17792007-04-19 21:01:03 -0400710static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
711{
712 struct btrfs_root *root = btrfs_sb(dentry->d_sb);
Chris Mason4b52dff2007-06-26 10:06:50 -0400713 struct btrfs_super_block *disk_super = &root->fs_info->super_copy;
Josef Bacikbd4d1082010-03-05 21:59:21 +0000714 struct list_head *head = &root->fs_info->space_info;
715 struct btrfs_space_info *found;
716 u64 total_used = 0;
Chris Masondb945352007-10-15 16:15:53 -0400717 int bits = dentry->d_sb->s_blocksize_bits;
David Woodhouse9d036322008-08-18 12:01:52 +0100718 __be32 *fsid = (__be32 *)root->fs_info->fsid;
Chris Mason8fd17792007-04-19 21:01:03 -0400719
Josef Bacikbd4d1082010-03-05 21:59:21 +0000720 rcu_read_lock();
Yan, Zhengb742bb82010-05-16 10:46:24 -0400721 list_for_each_entry_rcu(found, head, list)
722 total_used += found->disk_used;
Josef Bacikbd4d1082010-03-05 21:59:21 +0000723 rcu_read_unlock();
724
Chris Mason8fd17792007-04-19 21:01:03 -0400725 buf->f_namelen = BTRFS_NAME_LEN;
Chris Masondb945352007-10-15 16:15:53 -0400726 buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits;
Josef Bacikbd4d1082010-03-05 21:59:21 +0000727 buf->f_bfree = buf->f_blocks - (total_used >> bits);
Yan, Zhengb742bb82010-05-16 10:46:24 -0400728 buf->f_bavail = buf->f_bfree;
Chris Mason8fd17792007-04-19 21:01:03 -0400729 buf->f_bsize = dentry->d_sb->s_blocksize;
730 buf->f_type = BTRFS_SUPER_MAGIC;
Chris Masond3977122009-01-05 21:25:51 -0500731
David Woodhouse9d036322008-08-18 12:01:52 +0100732 /* We treat it as constant endianness (it doesn't matter _which_)
Chris Masond3977122009-01-05 21:25:51 -0500733 because we want the fsid to come out the same whether mounted
David Woodhouse9d036322008-08-18 12:01:52 +0100734 on a big-endian or little-endian host */
735 buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]);
736 buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]);
David Woodhouse32d48fa2008-08-18 13:10:20 +0100737 /* Mask in the root object ID too, to disambiguate subvols */
738 buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32;
739 buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid;
740
Chris Mason8fd17792007-04-19 21:01:03 -0400741 return 0;
742}
Chris Masonb5133862007-04-24 11:52:22 -0400743
Chris Mason2e635a22007-03-21 11:12:56 -0400744static struct file_system_type btrfs_fs_type = {
745 .owner = THIS_MODULE,
746 .name = "btrfs",
747 .get_sb = btrfs_get_sb,
Chris Masona061fc82008-05-07 11:43:44 -0400748 .kill_sb = kill_anon_super,
Chris Mason2e635a22007-03-21 11:12:56 -0400749 .fs_flags = FS_REQUIRES_DEV,
750};
Chris Masona9218f62008-03-24 15:02:04 -0400751
Chris Masond352ac62008-09-29 15:18:18 -0400752/*
753 * used by btrfsctl to scan devices when no FS is mounted
754 */
Chris Mason8a4b83c2008-03-24 15:02:07 -0400755static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
756 unsigned long arg)
757{
758 struct btrfs_ioctl_vol_args *vol;
759 struct btrfs_fs_devices *fs_devices;
Chris Masonc071fcf2009-01-16 11:59:08 -0500760 int ret = -ENOTTY;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400761
Chris Masone441d542009-01-05 16:57:23 -0500762 if (!capable(CAP_SYS_ADMIN))
763 return -EPERM;
764
Li Zefandae7b662009-04-08 15:06:54 +0800765 vol = memdup_user((void __user *)arg, sizeof(*vol));
766 if (IS_ERR(vol))
767 return PTR_ERR(vol);
Chris Masonc071fcf2009-01-16 11:59:08 -0500768
Chris Mason8a4b83c2008-03-24 15:02:07 -0400769 switch (cmd) {
770 case BTRFS_IOC_SCAN_DEV:
Christoph Hellwig97288f22008-12-02 06:36:09 -0500771 ret = btrfs_scan_one_device(vol->name, FMODE_READ,
Chris Mason8a4b83c2008-03-24 15:02:07 -0400772 &btrfs_fs_type, &fs_devices);
773 break;
774 }
Li Zefandae7b662009-04-08 15:06:54 +0800775
Chris Mason8a4b83c2008-03-24 15:02:07 -0400776 kfree(vol);
Linda Knippersf819d832008-06-09 22:17:11 -0400777 return ret;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400778}
779
Linus Torvalds01762602009-01-10 06:09:52 -0800780static int btrfs_freeze(struct super_block *sb)
Yaned0dab62008-01-22 12:46:56 -0500781{
782 struct btrfs_root *root = btrfs_sb(sb);
Chris Masona74a4b92008-06-25 16:01:31 -0400783 mutex_lock(&root->fs_info->transaction_kthread_mutex);
784 mutex_lock(&root->fs_info->cleaner_mutex);
Linus Torvalds01762602009-01-10 06:09:52 -0800785 return 0;
Yaned0dab62008-01-22 12:46:56 -0500786}
787
Linus Torvalds01762602009-01-10 06:09:52 -0800788static int btrfs_unfreeze(struct super_block *sb)
Yaned0dab62008-01-22 12:46:56 -0500789{
790 struct btrfs_root *root = btrfs_sb(sb);
Chris Masona74a4b92008-06-25 16:01:31 -0400791 mutex_unlock(&root->fs_info->cleaner_mutex);
792 mutex_unlock(&root->fs_info->transaction_kthread_mutex);
Linus Torvalds01762602009-01-10 06:09:52 -0800793 return 0;
Yaned0dab62008-01-22 12:46:56 -0500794}
Chris Mason2e635a22007-03-21 11:12:56 -0400795
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700796static const struct super_operations btrfs_super_ops = {
Yan, Zheng76dda932009-09-21 16:00:26 -0400797 .drop_inode = btrfs_drop_inode,
Chris Mason134e9732007-03-25 13:44:56 -0400798 .delete_inode = btrfs_delete_inode,
Chris Masone20d96d2007-03-22 12:13:20 -0400799 .put_super = btrfs_put_super,
Chris Masond5719762007-03-23 10:01:08 -0400800 .sync_fs = btrfs_sync_fs,
Eric Parisa9572a12009-04-02 16:46:06 -0400801 .show_options = btrfs_show_options,
Chris Mason4730a4b2007-03-26 12:00:39 -0400802 .write_inode = btrfs_write_inode,
Chris Masonb5133862007-04-24 11:52:22 -0400803 .dirty_inode = btrfs_dirty_inode,
Chris Mason2c90e5d2007-04-02 10:50:19 -0400804 .alloc_inode = btrfs_alloc_inode,
805 .destroy_inode = btrfs_destroy_inode,
Chris Mason8fd17792007-04-19 21:01:03 -0400806 .statfs = btrfs_statfs,
Yan Zhengc146afa2008-11-12 14:34:12 -0500807 .remount_fs = btrfs_remount,
Linus Torvalds01762602009-01-10 06:09:52 -0800808 .freeze_fs = btrfs_freeze,
809 .unfreeze_fs = btrfs_unfreeze,
Chris Masone20d96d2007-03-22 12:13:20 -0400810};
Chris Masona9218f62008-03-24 15:02:04 -0400811
812static const struct file_operations btrfs_ctl_fops = {
813 .unlocked_ioctl = btrfs_control_ioctl,
814 .compat_ioctl = btrfs_control_ioctl,
815 .owner = THIS_MODULE,
816};
817
818static struct miscdevice btrfs_misc = {
Kay Sievers578454f2010-05-20 18:07:20 +0200819 .minor = BTRFS_MINOR,
Chris Masona9218f62008-03-24 15:02:04 -0400820 .name = "btrfs-control",
821 .fops = &btrfs_ctl_fops
822};
823
Kay Sievers578454f2010-05-20 18:07:20 +0200824MODULE_ALIAS_MISCDEV(BTRFS_MINOR);
825MODULE_ALIAS("devname:btrfs-control");
826
Chris Masona9218f62008-03-24 15:02:04 -0400827static int btrfs_interface_init(void)
828{
829 return misc_register(&btrfs_misc);
830}
831
Christoph Hellwigb2950862008-12-02 09:54:17 -0500832static void btrfs_interface_exit(void)
Chris Masona9218f62008-03-24 15:02:04 -0400833{
834 if (misc_deregister(&btrfs_misc) < 0)
Chris Masond3977122009-01-05 21:25:51 -0500835 printk(KERN_INFO "misc_deregister failed for control device");
Chris Masona9218f62008-03-24 15:02:04 -0400836}
837
Chris Mason2e635a22007-03-21 11:12:56 -0400838static int __init init_btrfs_fs(void)
839{
Chris Mason2c90e5d2007-04-02 10:50:19 -0400840 int err;
Josef Bacik58176a92007-08-29 15:47:34 -0400841
842 err = btrfs_init_sysfs();
843 if (err)
844 return err;
845
Chris Mason39279cc2007-06-12 06:35:45 -0400846 err = btrfs_init_cachep();
Chris Mason2c90e5d2007-04-02 10:50:19 -0400847 if (err)
Chris Masona74a4b92008-06-25 16:01:31 -0400848 goto free_sysfs;
Chris Masond1310b22008-01-24 16:13:08 -0500849
850 err = extent_io_init();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500851 if (err)
852 goto free_cachep;
853
Chris Masond1310b22008-01-24 16:13:08 -0500854 err = extent_map_init();
855 if (err)
856 goto free_extent_io;
857
Chris Masona9218f62008-03-24 15:02:04 -0400858 err = btrfs_interface_init();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500859 if (err)
860 goto free_extent_map;
Chris Masonc8b97812008-10-29 14:49:59 -0400861
Chris Masona9218f62008-03-24 15:02:04 -0400862 err = register_filesystem(&btrfs_fs_type);
863 if (err)
864 goto unregister_ioctl;
Chris Masonb3c3da72008-07-23 12:12:13 -0400865
866 printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION);
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500867 return 0;
868
Chris Masona9218f62008-03-24 15:02:04 -0400869unregister_ioctl:
870 btrfs_interface_exit();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500871free_extent_map:
872 extent_map_exit();
Chris Masond1310b22008-01-24 16:13:08 -0500873free_extent_io:
874 extent_io_exit();
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500875free_cachep:
876 btrfs_destroy_cachep();
Chris Masona74a4b92008-06-25 16:01:31 -0400877free_sysfs:
Wyatt Banks2f4cbe62007-11-19 10:22:33 -0500878 btrfs_exit_sysfs();
879 return err;
Chris Mason2e635a22007-03-21 11:12:56 -0400880}
881
882static void __exit exit_btrfs_fs(void)
883{
Chris Mason39279cc2007-06-12 06:35:45 -0400884 btrfs_destroy_cachep();
Chris Masona52d9a82007-08-27 16:49:44 -0400885 extent_map_exit();
Chris Masond1310b22008-01-24 16:13:08 -0500886 extent_io_exit();
Chris Masona9218f62008-03-24 15:02:04 -0400887 btrfs_interface_exit();
Chris Mason2e635a22007-03-21 11:12:56 -0400888 unregister_filesystem(&btrfs_fs_type);
Josef Bacik58176a92007-08-29 15:47:34 -0400889 btrfs_exit_sysfs();
Chris Mason8a4b83c2008-03-24 15:02:07 -0400890 btrfs_cleanup_fs_uuids();
Chris Masonc8b97812008-10-29 14:49:59 -0400891 btrfs_zlib_exit();
Chris Mason2e635a22007-03-21 11:12:56 -0400892}
893
894module_init(init_btrfs_fs)
895module_exit(exit_btrfs_fs)
896
897MODULE_LICENSE("GPL");