Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 1 | /* |
| 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 | |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 19 | #include <linux/blkdev.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 20 | #include <linux/module.h> |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 21 | #include <linux/buffer_head.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 22 | #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 Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 27 | #include <linux/seq_file.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 28 | #include <linux/string.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 29 | #include <linux/backing-dev.h> |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 30 | #include <linux/mount.h> |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 31 | #include <linux/mpage.h> |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 32 | #include <linux/swap.h> |
| 33 | #include <linux/writeback.h> |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 34 | #include <linux/statfs.h> |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 35 | #include <linux/compat.h> |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 36 | #include <linux/parser.h> |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 37 | #include <linux/ctype.h> |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 38 | #include <linux/namei.h> |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 39 | #include <linux/miscdevice.h> |
Qinghuang Feng | 1bcbf31 | 2009-01-15 13:51:03 -0800 | [diff] [blame] | 40 | #include <linux/magic.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 41 | #include <linux/slab.h> |
Chris Mason | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 42 | #include "compat.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 43 | #include "ctree.h" |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 44 | #include "disk-io.h" |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 45 | #include "transaction.h" |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 46 | #include "btrfs_inode.h" |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 47 | #include "ioctl.h" |
Chris Mason | 3a68637 | 2007-05-24 13:35:57 -0400 | [diff] [blame] | 48 | #include "print-tree.h" |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 49 | #include "xattr.h" |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 50 | #include "volumes.h" |
Chris Mason | b3c3da7 | 2008-07-23 12:12:13 -0400 | [diff] [blame] | 51 | #include "version.h" |
Balaji Rao | be6e8dc | 2008-07-21 02:01:56 +0530 | [diff] [blame] | 52 | #include "export.h" |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 53 | #include "compression.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 54 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 55 | #define CREATE_TRACE_POINTS |
| 56 | #include <trace/events/btrfs.h> |
| 57 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 58 | static const struct super_operations btrfs_super_ops; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 59 | |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 60 | static const char *btrfs_decode_error(struct btrfs_fs_info *fs_info, int errno, |
| 61 | char nbuf[16]) |
| 62 | { |
| 63 | char *errstr = NULL; |
| 64 | |
| 65 | switch (errno) { |
| 66 | case -EIO: |
| 67 | errstr = "IO failure"; |
| 68 | break; |
| 69 | case -ENOMEM: |
| 70 | errstr = "Out of memory"; |
| 71 | break; |
| 72 | case -EROFS: |
| 73 | errstr = "Readonly filesystem"; |
| 74 | break; |
| 75 | default: |
| 76 | if (nbuf) { |
| 77 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) |
| 78 | errstr = nbuf; |
| 79 | } |
| 80 | break; |
| 81 | } |
| 82 | |
| 83 | return errstr; |
| 84 | } |
| 85 | |
| 86 | static void __save_error_info(struct btrfs_fs_info *fs_info) |
| 87 | { |
| 88 | /* |
| 89 | * today we only save the error info into ram. Long term we'll |
| 90 | * also send it down to the disk |
| 91 | */ |
| 92 | fs_info->fs_state = BTRFS_SUPER_FLAG_ERROR; |
| 93 | } |
| 94 | |
| 95 | /* NOTE: |
| 96 | * We move write_super stuff at umount in order to avoid deadlock |
| 97 | * for umount hold all lock. |
| 98 | */ |
| 99 | static void save_error_info(struct btrfs_fs_info *fs_info) |
| 100 | { |
| 101 | __save_error_info(fs_info); |
| 102 | } |
| 103 | |
| 104 | /* btrfs handle error by forcing the filesystem readonly */ |
| 105 | static void btrfs_handle_error(struct btrfs_fs_info *fs_info) |
| 106 | { |
| 107 | struct super_block *sb = fs_info->sb; |
| 108 | |
| 109 | if (sb->s_flags & MS_RDONLY) |
| 110 | return; |
| 111 | |
| 112 | if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { |
| 113 | sb->s_flags |= MS_RDONLY; |
| 114 | printk(KERN_INFO "btrfs is forced readonly\n"); |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | /* |
| 119 | * __btrfs_std_error decodes expected errors from the caller and |
| 120 | * invokes the approciate error response. |
| 121 | */ |
| 122 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, |
| 123 | unsigned int line, int errno) |
| 124 | { |
| 125 | struct super_block *sb = fs_info->sb; |
| 126 | char nbuf[16]; |
| 127 | const char *errstr; |
| 128 | |
| 129 | /* |
| 130 | * Special case: if the error is EROFS, and we're already |
| 131 | * under MS_RDONLY, then it is safe here. |
| 132 | */ |
| 133 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) |
| 134 | return; |
| 135 | |
| 136 | errstr = btrfs_decode_error(fs_info, errno, nbuf); |
| 137 | printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: %s\n", |
| 138 | sb->s_id, function, line, errstr); |
| 139 | save_error_info(fs_info); |
| 140 | |
| 141 | btrfs_handle_error(fs_info); |
| 142 | } |
| 143 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 144 | static void btrfs_put_super(struct super_block *sb) |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 145 | { |
| 146 | struct btrfs_root *root = btrfs_sb(sb); |
| 147 | int ret; |
| 148 | |
| 149 | ret = close_ctree(root); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 150 | sb->s_fs_info = NULL; |
Andi Kleen | 559af82 | 2010-10-29 15:14:37 -0400 | [diff] [blame] | 151 | |
| 152 | (void)ret; /* FIXME: need to fix VFS to return error? */ |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 153 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 154 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 155 | enum { |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 156 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
Josef Bacik | 287a0ab | 2010-03-19 18:07:23 +0000 | [diff] [blame] | 157 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
| 158 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 159 | Opt_compress_type, Opt_compress_force, Opt_compress_force_type, |
| 160 | Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, |
Chris Mason | 9143565 | 2011-02-16 13:10:41 -0500 | [diff] [blame] | 161 | Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, |
| 162 | Opt_enospc_debug, Opt_err, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 163 | }; |
| 164 | |
| 165 | static match_table_t tokens = { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 166 | {Opt_degraded, "degraded"}, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 167 | {Opt_subvol, "subvol=%s"}, |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 168 | {Opt_subvolid, "subvolid=%d"}, |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 169 | {Opt_device, "device=%s"}, |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 170 | {Opt_nodatasum, "nodatasum"}, |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 171 | {Opt_nodatacow, "nodatacow"}, |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 172 | {Opt_nobarrier, "nobarrier"}, |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 173 | {Opt_max_inline, "max_inline=%s"}, |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 174 | {Opt_alloc_start, "alloc_start=%s"}, |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 175 | {Opt_thread_pool, "thread_pool=%d"}, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 176 | {Opt_compress, "compress"}, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 177 | {Opt_compress_type, "compress=%s"}, |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 178 | {Opt_compress_force, "compress-force"}, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 179 | {Opt_compress_force_type, "compress-force=%s"}, |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 180 | {Opt_ssd, "ssd"}, |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 181 | {Opt_ssd_spread, "ssd_spread"}, |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 182 | {Opt_nossd, "nossd"}, |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 183 | {Opt_noacl, "noacl"}, |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 184 | {Opt_notreelog, "notreelog"}, |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 185 | {Opt_flushoncommit, "flushoncommit"}, |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 186 | {Opt_ratio, "metadata_ratio=%d"}, |
Christoph Hellwig | e244a0a | 2009-10-14 09:24:59 -0400 | [diff] [blame] | 187 | {Opt_discard, "discard"}, |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 188 | {Opt_space_cache, "space_cache"}, |
Josef Bacik | 88c2ba3 | 2010-09-21 14:21:34 -0400 | [diff] [blame] | 189 | {Opt_clear_cache, "clear_cache"}, |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 190 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
Chris Mason | 9143565 | 2011-02-16 13:10:41 -0500 | [diff] [blame] | 191 | {Opt_enospc_debug, "enospc_debug"}, |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 192 | {Opt_err, NULL}, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 193 | }; |
| 194 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 195 | /* |
| 196 | * Regular mount options parser. Everything that is needed only when |
| 197 | * reading in a new superblock is parsed here. |
| 198 | */ |
| 199 | int btrfs_parse_options(struct btrfs_root *root, char *options) |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 200 | { |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 201 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 202 | substring_t args[MAX_OPT_ARGS]; |
Josef Bacik | da495ec | 2010-02-25 20:38:35 +0000 | [diff] [blame] | 203 | char *p, *num, *orig; |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 204 | int intarg; |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 205 | int ret = 0; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 206 | char *compress_type; |
| 207 | bool compress_force = false; |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 208 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 209 | if (!options) |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 210 | return 0; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 211 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 212 | /* |
| 213 | * strsep changes the string, duplicate it because parse_options |
| 214 | * gets called twice |
| 215 | */ |
| 216 | options = kstrdup(options, GFP_NOFS); |
| 217 | if (!options) |
| 218 | return -ENOMEM; |
| 219 | |
Josef Bacik | da495ec | 2010-02-25 20:38:35 +0000 | [diff] [blame] | 220 | orig = options; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 221 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 222 | while ((p = strsep(&options, ",")) != NULL) { |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 223 | int token; |
| 224 | if (!*p) |
| 225 | continue; |
| 226 | |
| 227 | token = match_token(p, tokens, args); |
| 228 | switch (token) { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 229 | case Opt_degraded: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 230 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
| 231 | btrfs_set_opt(info->mount_opt, DEGRADED); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 232 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 233 | case Opt_subvol: |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 234 | case Opt_subvolid: |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 235 | case Opt_device: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 236 | /* |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 237 | * These are parsed by btrfs_parse_early_options |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 238 | * and can be happily ignored here. |
| 239 | */ |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 240 | break; |
| 241 | case Opt_nodatasum: |
Chris Mason | 067c28a | 2009-06-11 09:30:13 -0400 | [diff] [blame] | 242 | printk(KERN_INFO "btrfs: setting nodatasum\n"); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 243 | btrfs_set_opt(info->mount_opt, NODATASUM); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 244 | break; |
| 245 | case Opt_nodatacow: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 246 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
| 247 | btrfs_set_opt(info->mount_opt, NODATACOW); |
| 248 | btrfs_set_opt(info->mount_opt, NODATASUM); |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 249 | break; |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 250 | case Opt_compress_force: |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 251 | case Opt_compress_force_type: |
| 252 | compress_force = true; |
| 253 | case Opt_compress: |
| 254 | case Opt_compress_type: |
| 255 | if (token == Opt_compress || |
| 256 | token == Opt_compress_force || |
| 257 | strcmp(args[0].from, "zlib") == 0) { |
| 258 | compress_type = "zlib"; |
| 259 | info->compress_type = BTRFS_COMPRESS_ZLIB; |
Li Zefan | a6fa6fa | 2010-10-25 15:12:26 +0800 | [diff] [blame] | 260 | } else if (strcmp(args[0].from, "lzo") == 0) { |
| 261 | compress_type = "lzo"; |
| 262 | info->compress_type = BTRFS_COMPRESS_LZO; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 263 | } else { |
| 264 | ret = -EINVAL; |
| 265 | goto out; |
| 266 | } |
| 267 | |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 268 | btrfs_set_opt(info->mount_opt, COMPRESS); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 269 | if (compress_force) { |
| 270 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); |
| 271 | pr_info("btrfs: force %s compression\n", |
| 272 | compress_type); |
| 273 | } else |
| 274 | pr_info("btrfs: use %s compression\n", |
| 275 | compress_type); |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 276 | break; |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 277 | case Opt_ssd: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 278 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
| 279 | btrfs_set_opt(info->mount_opt, SSD); |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 280 | break; |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 281 | case Opt_ssd_spread: |
| 282 | printk(KERN_INFO "btrfs: use spread ssd " |
| 283 | "allocation scheme\n"); |
| 284 | btrfs_set_opt(info->mount_opt, SSD); |
| 285 | btrfs_set_opt(info->mount_opt, SSD_SPREAD); |
| 286 | break; |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 287 | case Opt_nossd: |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 288 | printk(KERN_INFO "btrfs: not using ssd allocation " |
| 289 | "scheme\n"); |
Chris Mason | c289811 | 2009-06-10 09:51:32 -0400 | [diff] [blame] | 290 | btrfs_set_opt(info->mount_opt, NOSSD); |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 291 | btrfs_clear_opt(info->mount_opt, SSD); |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 292 | btrfs_clear_opt(info->mount_opt, SSD_SPREAD); |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 293 | break; |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 294 | case Opt_nobarrier: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 295 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
| 296 | btrfs_set_opt(info->mount_opt, NOBARRIER); |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 297 | break; |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 298 | case Opt_thread_pool: |
| 299 | intarg = 0; |
| 300 | match_int(&args[0], &intarg); |
| 301 | if (intarg) { |
| 302 | info->thread_pool_size = intarg; |
| 303 | printk(KERN_INFO "btrfs: thread pool %d\n", |
| 304 | info->thread_pool_size); |
| 305 | } |
| 306 | break; |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 307 | case Opt_max_inline: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 308 | num = match_strdup(&args[0]); |
| 309 | if (num) { |
Akinobu Mita | 9174846 | 2010-02-28 10:59:11 +0000 | [diff] [blame] | 310 | info->max_inline = memparse(num, NULL); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 311 | kfree(num); |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 312 | |
Chris Mason | 15ada04 | 2008-06-11 16:51:38 -0400 | [diff] [blame] | 313 | if (info->max_inline) { |
| 314 | info->max_inline = max_t(u64, |
| 315 | info->max_inline, |
| 316 | root->sectorsize); |
| 317 | } |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 318 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 319 | (unsigned long long)info->max_inline); |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 320 | } |
| 321 | break; |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 322 | case Opt_alloc_start: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 323 | num = match_strdup(&args[0]); |
| 324 | if (num) { |
Akinobu Mita | 9174846 | 2010-02-28 10:59:11 +0000 | [diff] [blame] | 325 | info->alloc_start = memparse(num, NULL); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 326 | kfree(num); |
| 327 | printk(KERN_INFO |
| 328 | "btrfs: allocations start at %llu\n", |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 329 | (unsigned long long)info->alloc_start); |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 330 | } |
| 331 | break; |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 332 | case Opt_noacl: |
| 333 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; |
| 334 | break; |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 335 | case Opt_notreelog: |
| 336 | printk(KERN_INFO "btrfs: disabling tree log\n"); |
| 337 | btrfs_set_opt(info->mount_opt, NOTREELOG); |
| 338 | break; |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 339 | case Opt_flushoncommit: |
| 340 | printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); |
| 341 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); |
| 342 | break; |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 343 | case Opt_ratio: |
| 344 | intarg = 0; |
| 345 | match_int(&args[0], &intarg); |
| 346 | if (intarg) { |
| 347 | info->metadata_ratio = intarg; |
| 348 | printk(KERN_INFO "btrfs: metadata ratio %d\n", |
| 349 | info->metadata_ratio); |
| 350 | } |
| 351 | break; |
Christoph Hellwig | e244a0a | 2009-10-14 09:24:59 -0400 | [diff] [blame] | 352 | case Opt_discard: |
| 353 | btrfs_set_opt(info->mount_opt, DISCARD); |
| 354 | break; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 355 | case Opt_space_cache: |
| 356 | printk(KERN_INFO "btrfs: enabling disk space caching\n"); |
| 357 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
Josef Bacik | 0de9087 | 2010-11-19 13:40:41 +0000 | [diff] [blame] | 358 | break; |
Josef Bacik | 88c2ba3 | 2010-09-21 14:21:34 -0400 | [diff] [blame] | 359 | case Opt_clear_cache: |
| 360 | printk(KERN_INFO "btrfs: force clearing of disk cache\n"); |
| 361 | btrfs_set_opt(info->mount_opt, CLEAR_CACHE); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 362 | break; |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 363 | case Opt_user_subvol_rm_allowed: |
| 364 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); |
| 365 | break; |
Chris Mason | 9143565 | 2011-02-16 13:10:41 -0500 | [diff] [blame] | 366 | case Opt_enospc_debug: |
| 367 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); |
| 368 | break; |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 369 | case Opt_err: |
| 370 | printk(KERN_INFO "btrfs: unrecognized mount option " |
| 371 | "'%s'\n", p); |
| 372 | ret = -EINVAL; |
| 373 | goto out; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 374 | default: |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 375 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 376 | } |
| 377 | } |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 378 | out: |
Josef Bacik | da495ec | 2010-02-25 20:38:35 +0000 | [diff] [blame] | 379 | kfree(orig); |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 380 | return ret; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 381 | } |
| 382 | |
| 383 | /* |
| 384 | * Parse mount options that are required early in the mount process. |
| 385 | * |
| 386 | * All other options will be parsed on much later in the mount process and |
| 387 | * only when we need to allocate a new super block. |
| 388 | */ |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 389 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 390 | void *holder, char **subvol_name, u64 *subvol_objectid, |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 391 | struct btrfs_fs_devices **fs_devices) |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 392 | { |
| 393 | substring_t args[MAX_OPT_ARGS]; |
Tero Roponen | 3f3d0bc | 2010-12-27 16:43:13 +0800 | [diff] [blame] | 394 | char *opts, *orig, *p; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 395 | int error = 0; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 396 | int intarg; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 397 | |
| 398 | if (!options) |
| 399 | goto out; |
| 400 | |
| 401 | /* |
| 402 | * strsep changes the string, duplicate it because parse_options |
| 403 | * gets called twice |
| 404 | */ |
| 405 | opts = kstrdup(options, GFP_KERNEL); |
| 406 | if (!opts) |
| 407 | return -ENOMEM; |
Tero Roponen | 3f3d0bc | 2010-12-27 16:43:13 +0800 | [diff] [blame] | 408 | orig = opts; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 409 | |
| 410 | while ((p = strsep(&opts, ",")) != NULL) { |
| 411 | int token; |
| 412 | if (!*p) |
| 413 | continue; |
| 414 | |
| 415 | token = match_token(p, tokens, args); |
| 416 | switch (token) { |
| 417 | case Opt_subvol: |
| 418 | *subvol_name = match_strdup(&args[0]); |
| 419 | break; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 420 | case Opt_subvolid: |
| 421 | intarg = 0; |
Josef Bacik | 4849f01d | 2009-12-14 19:18:38 +0000 | [diff] [blame] | 422 | error = match_int(&args[0], &intarg); |
| 423 | if (!error) { |
| 424 | /* we want the original fs_tree */ |
| 425 | if (!intarg) |
| 426 | *subvol_objectid = |
| 427 | BTRFS_FS_TREE_OBJECTID; |
| 428 | else |
| 429 | *subvol_objectid = intarg; |
| 430 | } |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 431 | break; |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 432 | case Opt_device: |
| 433 | error = btrfs_scan_one_device(match_strdup(&args[0]), |
| 434 | flags, holder, fs_devices); |
| 435 | if (error) |
| 436 | goto out_free_opts; |
| 437 | break; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 438 | default: |
| 439 | break; |
| 440 | } |
| 441 | } |
| 442 | |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 443 | out_free_opts: |
Tero Roponen | 3f3d0bc | 2010-12-27 16:43:13 +0800 | [diff] [blame] | 444 | kfree(orig); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 445 | out: |
| 446 | /* |
| 447 | * If no subvolume name is specified we use the default one. Allocate |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 448 | * a copy of the string "." here so that code later in the |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 449 | * mount path doesn't care if it's the default volume or another one. |
| 450 | */ |
| 451 | if (!*subvol_name) { |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 452 | *subvol_name = kstrdup(".", GFP_KERNEL); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 453 | if (!*subvol_name) |
| 454 | return -ENOMEM; |
| 455 | } |
| 456 | return error; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 457 | } |
| 458 | |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 459 | static struct dentry *get_default_root(struct super_block *sb, |
| 460 | u64 subvol_objectid) |
| 461 | { |
| 462 | struct btrfs_root *root = sb->s_fs_info; |
| 463 | struct btrfs_root *new_root; |
| 464 | struct btrfs_dir_item *di; |
| 465 | struct btrfs_path *path; |
| 466 | struct btrfs_key location; |
| 467 | struct inode *inode; |
| 468 | struct dentry *dentry; |
| 469 | u64 dir_id; |
| 470 | int new = 0; |
| 471 | |
| 472 | /* |
| 473 | * We have a specific subvol we want to mount, just setup location and |
| 474 | * go look up the root. |
| 475 | */ |
| 476 | if (subvol_objectid) { |
| 477 | location.objectid = subvol_objectid; |
| 478 | location.type = BTRFS_ROOT_ITEM_KEY; |
| 479 | location.offset = (u64)-1; |
| 480 | goto find_root; |
| 481 | } |
| 482 | |
| 483 | path = btrfs_alloc_path(); |
| 484 | if (!path) |
| 485 | return ERR_PTR(-ENOMEM); |
| 486 | path->leave_spinning = 1; |
| 487 | |
| 488 | /* |
| 489 | * Find the "default" dir item which points to the root item that we |
| 490 | * will mount by default if we haven't been given a specific subvolume |
| 491 | * to mount. |
| 492 | */ |
| 493 | dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); |
| 494 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); |
Dan Carpenter | fb4f6f9 | 2010-05-29 09:40:57 +0000 | [diff] [blame] | 495 | if (IS_ERR(di)) |
| 496 | return ERR_CAST(di); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 497 | if (!di) { |
| 498 | /* |
| 499 | * Ok the default dir item isn't there. This is weird since |
| 500 | * it's always been there, but don't freak out, just try and |
| 501 | * mount to root most subvolume. |
| 502 | */ |
| 503 | btrfs_free_path(path); |
| 504 | dir_id = BTRFS_FIRST_FREE_OBJECTID; |
| 505 | new_root = root->fs_info->fs_root; |
| 506 | goto setup_root; |
| 507 | } |
| 508 | |
| 509 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); |
| 510 | btrfs_free_path(path); |
| 511 | |
| 512 | find_root: |
| 513 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); |
| 514 | if (IS_ERR(new_root)) |
Julia Lawall | d0b678c | 2010-10-29 15:14:23 -0400 | [diff] [blame] | 515 | return ERR_CAST(new_root); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 516 | |
| 517 | if (btrfs_root_refs(&new_root->root_item) == 0) |
| 518 | return ERR_PTR(-ENOENT); |
| 519 | |
| 520 | dir_id = btrfs_root_dirid(&new_root->root_item); |
| 521 | setup_root: |
| 522 | location.objectid = dir_id; |
| 523 | location.type = BTRFS_INODE_ITEM_KEY; |
| 524 | location.offset = 0; |
| 525 | |
| 526 | inode = btrfs_iget(sb, &location, new_root, &new); |
Dan Carpenter | 4cbd114 | 2010-05-29 09:42:19 +0000 | [diff] [blame] | 527 | if (IS_ERR(inode)) |
| 528 | return ERR_CAST(inode); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 529 | |
| 530 | /* |
| 531 | * If we're just mounting the root most subvol put the inode and return |
| 532 | * a reference to the dentry. We will have already gotten a reference |
| 533 | * to the inode in btrfs_fill_super so we're good to go. |
| 534 | */ |
| 535 | if (!new && sb->s_root->d_inode == inode) { |
| 536 | iput(inode); |
| 537 | return dget(sb->s_root); |
| 538 | } |
| 539 | |
| 540 | if (new) { |
| 541 | const struct qstr name = { .name = "/", .len = 1 }; |
| 542 | |
| 543 | /* |
| 544 | * New inode, we need to make the dentry a sibling of s_root so |
| 545 | * everything gets cleaned up properly on unmount. |
| 546 | */ |
| 547 | dentry = d_alloc(sb->s_root, &name); |
| 548 | if (!dentry) { |
| 549 | iput(inode); |
| 550 | return ERR_PTR(-ENOMEM); |
| 551 | } |
| 552 | d_splice_alias(inode, dentry); |
| 553 | } else { |
| 554 | /* |
| 555 | * We found the inode in cache, just find a dentry for it and |
| 556 | * put the reference to the inode we just got. |
| 557 | */ |
| 558 | dentry = d_find_alias(inode); |
| 559 | iput(inode); |
| 560 | } |
| 561 | |
| 562 | return dentry; |
| 563 | } |
| 564 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 565 | static int btrfs_fill_super(struct super_block *sb, |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 566 | struct btrfs_fs_devices *fs_devices, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 567 | void *data, int silent) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 568 | { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 569 | struct inode *inode; |
| 570 | struct dentry *root_dentry; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 571 | struct btrfs_root *tree_root; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 572 | struct btrfs_key key; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 573 | int err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 574 | |
| 575 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 576 | sb->s_magic = BTRFS_SUPER_MAGIC; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 577 | sb->s_op = &btrfs_super_ops; |
Al Viro | af53d29 | 2010-12-20 10:56:06 -0500 | [diff] [blame] | 578 | sb->s_d_op = &btrfs_dentry_operations; |
Balaji Rao | be6e8dc | 2008-07-21 02:01:56 +0530 | [diff] [blame] | 579 | sb->s_export_op = &btrfs_export_ops; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 580 | sb->s_xattr = btrfs_xattr_handlers; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 581 | sb->s_time_gran = 1; |
Chris Mason | 0eda294 | 2009-10-13 13:50:18 -0400 | [diff] [blame] | 582 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 583 | sb->s_flags |= MS_POSIXACL; |
Chris Ball | 49cf6f4 | 2009-09-29 13:51:04 -0400 | [diff] [blame] | 584 | #endif |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 585 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 586 | tree_root = open_ctree(sb, fs_devices, (char *)data); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 587 | |
Yan | e58ca02 | 2008-04-01 11:21:34 -0400 | [diff] [blame] | 588 | if (IS_ERR(tree_root)) { |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 589 | printk("btrfs: open_ctree failed\n"); |
Yan | e58ca02 | 2008-04-01 11:21:34 -0400 | [diff] [blame] | 590 | return PTR_ERR(tree_root); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 591 | } |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 592 | sb->s_fs_info = tree_root; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 593 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 594 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
| 595 | key.type = BTRFS_INODE_ITEM_KEY; |
| 596 | key.offset = 0; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 597 | inode = btrfs_iget(sb, &key, tree_root->fs_info->fs_root, NULL); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 598 | if (IS_ERR(inode)) { |
| 599 | err = PTR_ERR(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 600 | goto fail_close; |
| 601 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 602 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 603 | root_dentry = d_alloc_root(inode); |
| 604 | if (!root_dentry) { |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 605 | iput(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 606 | err = -ENOMEM; |
| 607 | goto fail_close; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 608 | } |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 609 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 610 | sb->s_root = root_dentry; |
Chris Mason | 6885f30 | 2008-02-20 16:11:05 -0500 | [diff] [blame] | 611 | |
Chris Mason | 6885f30 | 2008-02-20 16:11:05 -0500 | [diff] [blame] | 612 | save_mount_options(sb, data); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 613 | return 0; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 614 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 615 | fail_close: |
| 616 | close_ctree(tree_root); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 617 | return err; |
| 618 | } |
| 619 | |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 620 | int btrfs_sync_fs(struct super_block *sb, int wait) |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 621 | { |
| 622 | struct btrfs_trans_handle *trans; |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 623 | struct btrfs_root *root = btrfs_sb(sb); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 624 | int ret; |
Chris Mason | df2ce34 | 2007-03-23 11:00:45 -0400 | [diff] [blame] | 625 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 626 | trace_btrfs_sync_fs(wait); |
| 627 | |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 628 | if (!wait) { |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 629 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 630 | return 0; |
| 631 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 632 | |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 633 | btrfs_start_delalloc_inodes(root, 0); |
| 634 | btrfs_wait_ordered_extents(root, 0, 0); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 635 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 636 | trans = btrfs_start_transaction(root, 0); |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 637 | if (IS_ERR(trans)) |
| 638 | return PTR_ERR(trans); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 639 | ret = btrfs_commit_transaction(trans, root); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 640 | return ret; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 641 | } |
| 642 | |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 643 | static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
| 644 | { |
| 645 | struct btrfs_root *root = btrfs_sb(vfs->mnt_sb); |
| 646 | struct btrfs_fs_info *info = root->fs_info; |
| 647 | |
| 648 | if (btrfs_test_opt(root, DEGRADED)) |
| 649 | seq_puts(seq, ",degraded"); |
| 650 | if (btrfs_test_opt(root, NODATASUM)) |
| 651 | seq_puts(seq, ",nodatasum"); |
| 652 | if (btrfs_test_opt(root, NODATACOW)) |
| 653 | seq_puts(seq, ",nodatacow"); |
| 654 | if (btrfs_test_opt(root, NOBARRIER)) |
| 655 | seq_puts(seq, ",nobarrier"); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 656 | if (info->max_inline != 8192 * 1024) |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 657 | seq_printf(seq, ",max_inline=%llu", |
| 658 | (unsigned long long)info->max_inline); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 659 | if (info->alloc_start != 0) |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 660 | seq_printf(seq, ",alloc_start=%llu", |
| 661 | (unsigned long long)info->alloc_start); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 662 | if (info->thread_pool_size != min_t(unsigned long, |
| 663 | num_online_cpus() + 2, 8)) |
| 664 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); |
| 665 | if (btrfs_test_opt(root, COMPRESS)) |
| 666 | seq_puts(seq, ",compress"); |
Chris Mason | c289811 | 2009-06-10 09:51:32 -0400 | [diff] [blame] | 667 | if (btrfs_test_opt(root, NOSSD)) |
| 668 | seq_puts(seq, ",nossd"); |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 669 | if (btrfs_test_opt(root, SSD_SPREAD)) |
| 670 | seq_puts(seq, ",ssd_spread"); |
| 671 | else if (btrfs_test_opt(root, SSD)) |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 672 | seq_puts(seq, ",ssd"); |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 673 | if (btrfs_test_opt(root, NOTREELOG)) |
Sage Weil | 6b65c5c | 2009-05-14 13:52:21 -0400 | [diff] [blame] | 674 | seq_puts(seq, ",notreelog"); |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 675 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
Sage Weil | 6b65c5c | 2009-05-14 13:52:21 -0400 | [diff] [blame] | 676 | seq_puts(seq, ",flushoncommit"); |
Matthew Wilcox | 20a5239 | 2009-12-14 22:01:12 +0000 | [diff] [blame] | 677 | if (btrfs_test_opt(root, DISCARD)) |
| 678 | seq_puts(seq, ",discard"); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 679 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
| 680 | seq_puts(seq, ",noacl"); |
| 681 | return 0; |
| 682 | } |
| 683 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 684 | static int btrfs_test_super(struct super_block *s, void *data) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 685 | { |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 686 | struct btrfs_root *test_root = data; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 687 | struct btrfs_root *root = btrfs_sb(s); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 688 | |
Ian Kent | 619c8c7 | 2010-11-22 02:21:38 +0000 | [diff] [blame] | 689 | /* |
| 690 | * If this super block is going away, return false as it |
| 691 | * can't match as an existing super block. |
| 692 | */ |
| 693 | if (!atomic_read(&s->s_active)) |
| 694 | return 0; |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 695 | return root->fs_info->fs_devices == test_root->fs_info->fs_devices; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 696 | } |
| 697 | |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 698 | static int btrfs_set_super(struct super_block *s, void *data) |
| 699 | { |
| 700 | s->s_fs_info = data; |
| 701 | |
| 702 | return set_anon_super(s, data); |
| 703 | } |
| 704 | |
| 705 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 706 | /* |
| 707 | * Find a superblock for the given device / mount point. |
| 708 | * |
| 709 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions |
| 710 | * for multiple device setup. Make sure to keep it in sync. |
| 711 | */ |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 712 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
| 713 | const char *dev_name, void *data) |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 714 | { |
| 715 | struct block_device *bdev = NULL; |
| 716 | struct super_block *s; |
| 717 | struct dentry *root; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 718 | struct btrfs_fs_devices *fs_devices = NULL; |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 719 | struct btrfs_root *tree_root = NULL; |
| 720 | struct btrfs_fs_info *fs_info = NULL; |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 721 | fmode_t mode = FMODE_READ; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 722 | char *subvol_name = NULL; |
| 723 | u64 subvol_objectid = 0; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 724 | int error = 0; |
| 725 | |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 726 | if (!(flags & MS_RDONLY)) |
| 727 | mode |= FMODE_WRITE; |
| 728 | |
| 729 | error = btrfs_parse_early_options(data, mode, fs_type, |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 730 | &subvol_name, &subvol_objectid, |
| 731 | &fs_devices); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 732 | if (error) |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 733 | return ERR_PTR(error); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 734 | |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 735 | error = btrfs_scan_one_device(dev_name, mode, fs_type, &fs_devices); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 736 | if (error) |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 737 | goto error_free_subvol_name; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 738 | |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 739 | error = btrfs_open_devices(fs_devices, mode, fs_type); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 740 | if (error) |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 741 | goto error_free_subvol_name; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 742 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 743 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { |
| 744 | error = -EACCES; |
| 745 | goto error_close_devices; |
| 746 | } |
| 747 | |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 748 | /* |
| 749 | * Setup a dummy root and fs_info for test/set super. This is because |
| 750 | * we don't actually fill this stuff out until open_ctree, but we need |
| 751 | * it for searching for existing supers, so this lets us do that and |
| 752 | * then open_ctree will properly initialize everything later. |
| 753 | */ |
| 754 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); |
| 755 | tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS); |
| 756 | if (!fs_info || !tree_root) { |
| 757 | error = -ENOMEM; |
| 758 | goto error_close_devices; |
| 759 | } |
| 760 | fs_info->tree_root = tree_root; |
| 761 | fs_info->fs_devices = fs_devices; |
| 762 | tree_root->fs_info = fs_info; |
| 763 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 764 | bdev = fs_devices->latest_bdev; |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 765 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, tree_root); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 766 | if (IS_ERR(s)) |
| 767 | goto error_s; |
| 768 | |
| 769 | if (s->s_root) { |
| 770 | if ((flags ^ s->s_flags) & MS_RDONLY) { |
Al Viro | 6f5bbff | 2009-05-06 01:34:22 -0400 | [diff] [blame] | 771 | deactivate_locked_super(s); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 772 | error = -EBUSY; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 773 | goto error_close_devices; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 774 | } |
| 775 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 776 | btrfs_close_devices(fs_devices); |
Ian Kent | bdc924b | 2010-12-27 16:33:15 +0800 | [diff] [blame] | 777 | kfree(fs_info); |
| 778 | kfree(tree_root); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 779 | } else { |
| 780 | char b[BDEVNAME_SIZE]; |
| 781 | |
| 782 | s->s_flags = flags; |
| 783 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 784 | error = btrfs_fill_super(s, fs_devices, data, |
| 785 | flags & MS_SILENT ? 1 : 0); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 786 | if (error) { |
Al Viro | 6f5bbff | 2009-05-06 01:34:22 -0400 | [diff] [blame] | 787 | deactivate_locked_super(s); |
Shen Feng | 1f48366 | 2009-01-05 15:43:42 -0500 | [diff] [blame] | 788 | goto error_free_subvol_name; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 789 | } |
| 790 | |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 791 | btrfs_sb(s)->fs_info->bdev_holder = fs_type; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 792 | s->s_flags |= MS_ACTIVE; |
| 793 | } |
| 794 | |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 795 | root = get_default_root(s, subvol_objectid); |
| 796 | if (IS_ERR(root)) { |
| 797 | error = PTR_ERR(root); |
| 798 | deactivate_locked_super(s); |
Josef Bacik | 0e78340 | 2010-10-22 15:26:53 -0400 | [diff] [blame] | 799 | goto error_free_subvol_name; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 800 | } |
| 801 | /* if they gave us a subvolume name bind mount into that */ |
| 802 | if (strcmp(subvol_name, ".")) { |
| 803 | struct dentry *new_root; |
| 804 | mutex_lock(&root->d_inode->i_mutex); |
| 805 | new_root = lookup_one_len(subvol_name, root, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 806 | strlen(subvol_name)); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 807 | mutex_unlock(&root->d_inode->i_mutex); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 808 | |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 809 | if (IS_ERR(new_root)) { |
Li Zefan | f106e82 | 2010-12-07 01:51:26 +0000 | [diff] [blame] | 810 | dput(root); |
Al Viro | 6f5bbff | 2009-05-06 01:34:22 -0400 | [diff] [blame] | 811 | deactivate_locked_super(s); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 812 | error = PTR_ERR(new_root); |
Josef Bacik | 0e78340 | 2010-10-22 15:26:53 -0400 | [diff] [blame] | 813 | goto error_free_subvol_name; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 814 | } |
| 815 | if (!new_root->d_inode) { |
| 816 | dput(root); |
| 817 | dput(new_root); |
Al Viro | 6f5bbff | 2009-05-06 01:34:22 -0400 | [diff] [blame] | 818 | deactivate_locked_super(s); |
David Woodhouse | 76fcef1 | 2008-08-19 16:49:35 +0100 | [diff] [blame] | 819 | error = -ENXIO; |
Josef Bacik | 0e78340 | 2010-10-22 15:26:53 -0400 | [diff] [blame] | 820 | goto error_free_subvol_name; |
David Woodhouse | 76fcef1 | 2008-08-19 16:49:35 +0100 | [diff] [blame] | 821 | } |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 822 | dput(root); |
| 823 | root = new_root; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 824 | } |
| 825 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 826 | kfree(subvol_name); |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 827 | return root; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 828 | |
| 829 | error_s: |
| 830 | error = PTR_ERR(s); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 831 | error_close_devices: |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 832 | btrfs_close_devices(fs_devices); |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 833 | kfree(fs_info); |
| 834 | kfree(tree_root); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 835 | error_free_subvol_name: |
| 836 | kfree(subvol_name); |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 837 | return ERR_PTR(error); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 838 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 839 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 840 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
| 841 | { |
| 842 | struct btrfs_root *root = btrfs_sb(sb); |
| 843 | int ret; |
| 844 | |
Chris Mason | b288052 | 2009-02-12 09:37:35 -0500 | [diff] [blame] | 845 | ret = btrfs_parse_options(root, data); |
| 846 | if (ret) |
| 847 | return -EINVAL; |
| 848 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 849 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 850 | return 0; |
| 851 | |
| 852 | if (*flags & MS_RDONLY) { |
| 853 | sb->s_flags |= MS_RDONLY; |
| 854 | |
| 855 | ret = btrfs_commit_super(root); |
| 856 | WARN_ON(ret); |
| 857 | } else { |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 858 | if (root->fs_info->fs_devices->rw_devices == 0) |
| 859 | return -EACCES; |
| 860 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 861 | if (btrfs_super_log_root(&root->fs_info->super_copy) != 0) |
| 862 | return -EINVAL; |
| 863 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 864 | ret = btrfs_cleanup_fs_roots(root->fs_info); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 865 | WARN_ON(ret); |
| 866 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 867 | /* recover relocation */ |
| 868 | ret = btrfs_recover_relocation(root); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 869 | WARN_ON(ret); |
| 870 | |
| 871 | sb->s_flags &= ~MS_RDONLY; |
| 872 | } |
| 873 | |
| 874 | return 0; |
| 875 | } |
| 876 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 877 | /* |
| 878 | * The helper to calc the free space on the devices that can be used to store |
| 879 | * file data. |
| 880 | */ |
| 881 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) |
| 882 | { |
| 883 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 884 | struct btrfs_device_info *devices_info; |
| 885 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
| 886 | struct btrfs_device *device; |
| 887 | u64 skip_space; |
| 888 | u64 type; |
| 889 | u64 avail_space; |
| 890 | u64 used_space; |
| 891 | u64 min_stripe_size; |
| 892 | int min_stripes = 1; |
| 893 | int i = 0, nr_devices; |
| 894 | int ret; |
| 895 | |
| 896 | nr_devices = fs_info->fs_devices->rw_devices; |
| 897 | BUG_ON(!nr_devices); |
| 898 | |
| 899 | devices_info = kmalloc(sizeof(*devices_info) * nr_devices, |
| 900 | GFP_NOFS); |
| 901 | if (!devices_info) |
| 902 | return -ENOMEM; |
| 903 | |
| 904 | /* calc min stripe number for data space alloction */ |
| 905 | type = btrfs_get_alloc_profile(root, 1); |
| 906 | if (type & BTRFS_BLOCK_GROUP_RAID0) |
| 907 | min_stripes = 2; |
| 908 | else if (type & BTRFS_BLOCK_GROUP_RAID1) |
| 909 | min_stripes = 2; |
| 910 | else if (type & BTRFS_BLOCK_GROUP_RAID10) |
| 911 | min_stripes = 4; |
| 912 | |
| 913 | if (type & BTRFS_BLOCK_GROUP_DUP) |
| 914 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; |
| 915 | else |
| 916 | min_stripe_size = BTRFS_STRIPE_LEN; |
| 917 | |
| 918 | list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) { |
| 919 | if (!device->in_fs_metadata) |
| 920 | continue; |
| 921 | |
| 922 | avail_space = device->total_bytes - device->bytes_used; |
| 923 | |
| 924 | /* align with stripe_len */ |
| 925 | do_div(avail_space, BTRFS_STRIPE_LEN); |
| 926 | avail_space *= BTRFS_STRIPE_LEN; |
| 927 | |
| 928 | /* |
| 929 | * In order to avoid overwritting the superblock on the drive, |
| 930 | * btrfs starts at an offset of at least 1MB when doing chunk |
| 931 | * allocation. |
| 932 | */ |
| 933 | skip_space = 1024 * 1024; |
| 934 | |
| 935 | /* user can set the offset in fs_info->alloc_start. */ |
| 936 | if (fs_info->alloc_start + BTRFS_STRIPE_LEN <= |
| 937 | device->total_bytes) |
| 938 | skip_space = max(fs_info->alloc_start, skip_space); |
| 939 | |
| 940 | /* |
| 941 | * btrfs can not use the free space in [0, skip_space - 1], |
| 942 | * we must subtract it from the total. In order to implement |
| 943 | * it, we account the used space in this range first. |
| 944 | */ |
| 945 | ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1, |
| 946 | &used_space); |
| 947 | if (ret) { |
| 948 | kfree(devices_info); |
| 949 | return ret; |
| 950 | } |
| 951 | |
| 952 | /* calc the free space in [0, skip_space - 1] */ |
| 953 | skip_space -= used_space; |
| 954 | |
| 955 | /* |
| 956 | * we can use the free space in [0, skip_space - 1], subtract |
| 957 | * it from the total. |
| 958 | */ |
| 959 | if (avail_space && avail_space >= skip_space) |
| 960 | avail_space -= skip_space; |
| 961 | else |
| 962 | avail_space = 0; |
| 963 | |
| 964 | if (avail_space < min_stripe_size) |
| 965 | continue; |
| 966 | |
| 967 | devices_info[i].dev = device; |
| 968 | devices_info[i].max_avail = avail_space; |
| 969 | |
| 970 | i++; |
| 971 | } |
| 972 | |
| 973 | nr_devices = i; |
| 974 | |
| 975 | btrfs_descending_sort_devices(devices_info, nr_devices); |
| 976 | |
| 977 | i = nr_devices - 1; |
| 978 | avail_space = 0; |
| 979 | while (nr_devices >= min_stripes) { |
| 980 | if (devices_info[i].max_avail >= min_stripe_size) { |
| 981 | int j; |
| 982 | u64 alloc_size; |
| 983 | |
| 984 | avail_space += devices_info[i].max_avail * min_stripes; |
| 985 | alloc_size = devices_info[i].max_avail; |
| 986 | for (j = i + 1 - min_stripes; j <= i; j++) |
| 987 | devices_info[j].max_avail -= alloc_size; |
| 988 | } |
| 989 | i--; |
| 990 | nr_devices--; |
| 991 | } |
| 992 | |
| 993 | kfree(devices_info); |
| 994 | *free_bytes = avail_space; |
| 995 | return 0; |
| 996 | } |
| 997 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 998 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 999 | { |
| 1000 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); |
Chris Mason | 4b52dff | 2007-06-26 10:06:50 -0400 | [diff] [blame] | 1001 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 1002 | struct list_head *head = &root->fs_info->space_info; |
| 1003 | struct btrfs_space_info *found; |
| 1004 | u64 total_used = 0; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1005 | u64 total_free_data = 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1006 | int bits = dentry->d_sb->s_blocksize_bits; |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 1007 | __be32 *fsid = (__be32 *)root->fs_info->fsid; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1008 | int ret; |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1009 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1010 | /* holding chunk_muext to avoid allocating new chunks */ |
| 1011 | mutex_lock(&root->fs_info->chunk_mutex); |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 1012 | rcu_read_lock(); |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 1013 | list_for_each_entry_rcu(found, head, list) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1014 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
| 1015 | total_free_data += found->disk_total - found->disk_used; |
| 1016 | total_free_data -= |
| 1017 | btrfs_account_ro_block_groups_free_space(found); |
| 1018 | } |
| 1019 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 1020 | total_used += found->disk_used; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 1021 | } |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 1022 | rcu_read_unlock(); |
| 1023 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1024 | buf->f_namelen = BTRFS_NAME_LEN; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1025 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 1026 | buf->f_bfree = buf->f_blocks - (total_used >> bits); |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1027 | buf->f_bsize = dentry->d_sb->s_blocksize; |
| 1028 | buf->f_type = BTRFS_SUPER_MAGIC; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1029 | buf->f_bavail = total_free_data; |
| 1030 | ret = btrfs_calc_avail_data_space(root, &total_free_data); |
| 1031 | if (ret) { |
| 1032 | mutex_unlock(&root->fs_info->chunk_mutex); |
| 1033 | return ret; |
| 1034 | } |
| 1035 | buf->f_bavail += total_free_data; |
| 1036 | buf->f_bavail = buf->f_bavail >> bits; |
| 1037 | mutex_unlock(&root->fs_info->chunk_mutex); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1038 | |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 1039 | /* We treat it as constant endianness (it doesn't matter _which_) |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1040 | because we want the fsid to come out the same whether mounted |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 1041 | on a big-endian or little-endian host */ |
| 1042 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); |
| 1043 | buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]); |
David Woodhouse | 32d48fa | 2008-08-18 13:10:20 +0100 | [diff] [blame] | 1044 | /* Mask in the root object ID too, to disambiguate subvols */ |
| 1045 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; |
| 1046 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; |
| 1047 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1048 | return 0; |
| 1049 | } |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 1050 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1051 | static struct file_system_type btrfs_fs_type = { |
| 1052 | .owner = THIS_MODULE, |
| 1053 | .name = "btrfs", |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 1054 | .mount = btrfs_mount, |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1055 | .kill_sb = kill_anon_super, |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1056 | .fs_flags = FS_REQUIRES_DEV, |
| 1057 | }; |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1058 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1059 | /* |
| 1060 | * used by btrfsctl to scan devices when no FS is mounted |
| 1061 | */ |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1062 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
| 1063 | unsigned long arg) |
| 1064 | { |
| 1065 | struct btrfs_ioctl_vol_args *vol; |
| 1066 | struct btrfs_fs_devices *fs_devices; |
Chris Mason | c071fcf | 2009-01-16 11:59:08 -0500 | [diff] [blame] | 1067 | int ret = -ENOTTY; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1068 | |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 1069 | if (!capable(CAP_SYS_ADMIN)) |
| 1070 | return -EPERM; |
| 1071 | |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 1072 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
| 1073 | if (IS_ERR(vol)) |
| 1074 | return PTR_ERR(vol); |
Chris Mason | c071fcf | 2009-01-16 11:59:08 -0500 | [diff] [blame] | 1075 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1076 | switch (cmd) { |
| 1077 | case BTRFS_IOC_SCAN_DEV: |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 1078 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1079 | &btrfs_fs_type, &fs_devices); |
| 1080 | break; |
| 1081 | } |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 1082 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1083 | kfree(vol); |
Linda Knippers | f819d83 | 2008-06-09 22:17:11 -0400 | [diff] [blame] | 1084 | return ret; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1085 | } |
| 1086 | |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1087 | static int btrfs_freeze(struct super_block *sb) |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1088 | { |
| 1089 | struct btrfs_root *root = btrfs_sb(sb); |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 1090 | mutex_lock(&root->fs_info->transaction_kthread_mutex); |
| 1091 | mutex_lock(&root->fs_info->cleaner_mutex); |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1092 | return 0; |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1093 | } |
| 1094 | |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1095 | static int btrfs_unfreeze(struct super_block *sb) |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1096 | { |
| 1097 | struct btrfs_root *root = btrfs_sb(sb); |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 1098 | mutex_unlock(&root->fs_info->cleaner_mutex); |
| 1099 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1100 | return 0; |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1101 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1102 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 1103 | static const struct super_operations btrfs_super_ops = { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1104 | .drop_inode = btrfs_drop_inode, |
Al Viro | bd55597 | 2010-06-07 11:35:40 -0400 | [diff] [blame] | 1105 | .evict_inode = btrfs_evict_inode, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1106 | .put_super = btrfs_put_super, |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1107 | .sync_fs = btrfs_sync_fs, |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 1108 | .show_options = btrfs_show_options, |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 1109 | .write_inode = btrfs_write_inode, |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 1110 | .dirty_inode = btrfs_dirty_inode, |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1111 | .alloc_inode = btrfs_alloc_inode, |
| 1112 | .destroy_inode = btrfs_destroy_inode, |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1113 | .statfs = btrfs_statfs, |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1114 | .remount_fs = btrfs_remount, |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1115 | .freeze_fs = btrfs_freeze, |
| 1116 | .unfreeze_fs = btrfs_unfreeze, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1117 | }; |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1118 | |
| 1119 | static const struct file_operations btrfs_ctl_fops = { |
| 1120 | .unlocked_ioctl = btrfs_control_ioctl, |
| 1121 | .compat_ioctl = btrfs_control_ioctl, |
| 1122 | .owner = THIS_MODULE, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1123 | .llseek = noop_llseek, |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1124 | }; |
| 1125 | |
| 1126 | static struct miscdevice btrfs_misc = { |
Kay Sievers | 578454f | 2010-05-20 18:07:20 +0200 | [diff] [blame] | 1127 | .minor = BTRFS_MINOR, |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1128 | .name = "btrfs-control", |
| 1129 | .fops = &btrfs_ctl_fops |
| 1130 | }; |
| 1131 | |
Kay Sievers | 578454f | 2010-05-20 18:07:20 +0200 | [diff] [blame] | 1132 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
| 1133 | MODULE_ALIAS("devname:btrfs-control"); |
| 1134 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1135 | static int btrfs_interface_init(void) |
| 1136 | { |
| 1137 | return misc_register(&btrfs_misc); |
| 1138 | } |
| 1139 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1140 | static void btrfs_interface_exit(void) |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1141 | { |
| 1142 | if (misc_deregister(&btrfs_misc) < 0) |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1143 | printk(KERN_INFO "misc_deregister failed for control device"); |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1144 | } |
| 1145 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1146 | static int __init init_btrfs_fs(void) |
| 1147 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1148 | int err; |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1149 | |
| 1150 | err = btrfs_init_sysfs(); |
| 1151 | if (err) |
| 1152 | return err; |
| 1153 | |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1154 | err = btrfs_init_compress(); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1155 | if (err) |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 1156 | goto free_sysfs; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1157 | |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1158 | err = btrfs_init_cachep(); |
| 1159 | if (err) |
| 1160 | goto free_compress; |
| 1161 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1162 | err = extent_io_init(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1163 | if (err) |
| 1164 | goto free_cachep; |
| 1165 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1166 | err = extent_map_init(); |
| 1167 | if (err) |
| 1168 | goto free_extent_io; |
| 1169 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1170 | err = btrfs_interface_init(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1171 | if (err) |
| 1172 | goto free_extent_map; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1173 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1174 | err = register_filesystem(&btrfs_fs_type); |
| 1175 | if (err) |
| 1176 | goto unregister_ioctl; |
Chris Mason | b3c3da7 | 2008-07-23 12:12:13 -0400 | [diff] [blame] | 1177 | |
| 1178 | printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1179 | return 0; |
| 1180 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1181 | unregister_ioctl: |
| 1182 | btrfs_interface_exit(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1183 | free_extent_map: |
| 1184 | extent_map_exit(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1185 | free_extent_io: |
| 1186 | extent_io_exit(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1187 | free_cachep: |
| 1188 | btrfs_destroy_cachep(); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1189 | free_compress: |
| 1190 | btrfs_exit_compress(); |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 1191 | free_sysfs: |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1192 | btrfs_exit_sysfs(); |
| 1193 | return err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1194 | } |
| 1195 | |
| 1196 | static void __exit exit_btrfs_fs(void) |
| 1197 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1198 | btrfs_destroy_cachep(); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1199 | extent_map_exit(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1200 | extent_io_exit(); |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1201 | btrfs_interface_exit(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1202 | unregister_filesystem(&btrfs_fs_type); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1203 | btrfs_exit_sysfs(); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1204 | btrfs_cleanup_fs_uuids(); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1205 | btrfs_exit_compress(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1206 | } |
| 1207 | |
| 1208 | module_init(init_btrfs_fs) |
| 1209 | module_exit(exit_btrfs_fs) |
| 1210 | |
| 1211 | MODULE_LICENSE("GPL"); |