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> |
Dan Magenheimer | 90a887c | 2011-05-26 10:01:56 -0600 | [diff] [blame] | 42 | #include <linux/cleancache.h> |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 43 | #include <linux/ratelimit.h> |
Chris Mason | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 44 | #include "compat.h" |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 45 | #include "delayed-inode.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 46 | #include "ctree.h" |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 47 | #include "disk-io.h" |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 48 | #include "transaction.h" |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 49 | #include "btrfs_inode.h" |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 50 | #include "ioctl.h" |
Chris Mason | 3a68637 | 2007-05-24 13:35:57 -0400 | [diff] [blame] | 51 | #include "print-tree.h" |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 52 | #include "xattr.h" |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 53 | #include "volumes.h" |
Chris Mason | b3c3da7 | 2008-07-23 12:12:13 -0400 | [diff] [blame] | 54 | #include "version.h" |
Balaji Rao | be6e8dc | 2008-07-21 02:01:56 +0530 | [diff] [blame] | 55 | #include "export.h" |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 56 | #include "compression.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 57 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 58 | #define CREATE_TRACE_POINTS |
| 59 | #include <trace/events/btrfs.h> |
| 60 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 61 | static const struct super_operations btrfs_super_ops; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 62 | static struct file_system_type btrfs_fs_type; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 63 | |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 64 | static const char *btrfs_decode_error(struct btrfs_fs_info *fs_info, int errno, |
| 65 | char nbuf[16]) |
| 66 | { |
| 67 | char *errstr = NULL; |
| 68 | |
| 69 | switch (errno) { |
| 70 | case -EIO: |
| 71 | errstr = "IO failure"; |
| 72 | break; |
| 73 | case -ENOMEM: |
| 74 | errstr = "Out of memory"; |
| 75 | break; |
| 76 | case -EROFS: |
| 77 | errstr = "Readonly filesystem"; |
| 78 | break; |
| 79 | default: |
| 80 | if (nbuf) { |
| 81 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) |
| 82 | errstr = nbuf; |
| 83 | } |
| 84 | break; |
| 85 | } |
| 86 | |
| 87 | return errstr; |
| 88 | } |
| 89 | |
| 90 | static void __save_error_info(struct btrfs_fs_info *fs_info) |
| 91 | { |
| 92 | /* |
| 93 | * today we only save the error info into ram. Long term we'll |
| 94 | * also send it down to the disk |
| 95 | */ |
| 96 | fs_info->fs_state = BTRFS_SUPER_FLAG_ERROR; |
| 97 | } |
| 98 | |
| 99 | /* NOTE: |
| 100 | * We move write_super stuff at umount in order to avoid deadlock |
| 101 | * for umount hold all lock. |
| 102 | */ |
| 103 | static void save_error_info(struct btrfs_fs_info *fs_info) |
| 104 | { |
| 105 | __save_error_info(fs_info); |
| 106 | } |
| 107 | |
| 108 | /* btrfs handle error by forcing the filesystem readonly */ |
| 109 | static void btrfs_handle_error(struct btrfs_fs_info *fs_info) |
| 110 | { |
| 111 | struct super_block *sb = fs_info->sb; |
| 112 | |
| 113 | if (sb->s_flags & MS_RDONLY) |
| 114 | return; |
| 115 | |
| 116 | if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { |
| 117 | sb->s_flags |= MS_RDONLY; |
| 118 | printk(KERN_INFO "btrfs is forced readonly\n"); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * __btrfs_std_error decodes expected errors from the caller and |
| 124 | * invokes the approciate error response. |
| 125 | */ |
| 126 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, |
| 127 | unsigned int line, int errno) |
| 128 | { |
| 129 | struct super_block *sb = fs_info->sb; |
| 130 | char nbuf[16]; |
| 131 | const char *errstr; |
| 132 | |
| 133 | /* |
| 134 | * Special case: if the error is EROFS, and we're already |
| 135 | * under MS_RDONLY, then it is safe here. |
| 136 | */ |
| 137 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) |
| 138 | return; |
| 139 | |
| 140 | errstr = btrfs_decode_error(fs_info, errno, nbuf); |
| 141 | printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: %s\n", |
| 142 | sb->s_id, function, line, errstr); |
| 143 | save_error_info(fs_info); |
| 144 | |
| 145 | btrfs_handle_error(fs_info); |
| 146 | } |
| 147 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 148 | static void btrfs_put_super(struct super_block *sb) |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 149 | { |
| 150 | struct btrfs_root *root = btrfs_sb(sb); |
| 151 | int ret; |
| 152 | |
| 153 | ret = close_ctree(root); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 154 | sb->s_fs_info = NULL; |
Andi Kleen | 559af82 | 2010-10-29 15:14:37 -0400 | [diff] [blame] | 155 | |
| 156 | (void)ret; /* FIXME: need to fix VFS to return error? */ |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 157 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 158 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 159 | enum { |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 160 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
Josef Bacik | 287a0ab | 2010-03-19 18:07:23 +0000 | [diff] [blame] | 161 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
| 162 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 163 | Opt_compress_type, Opt_compress_force, Opt_compress_force_type, |
| 164 | Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, |
Chris Mason | 9143565 | 2011-02-16 13:10:41 -0500 | [diff] [blame] | 165 | Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 166 | Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, |
Chris Mason | af31f5e | 2011-11-03 15:17:42 -0400 | [diff] [blame] | 167 | Opt_inode_cache, Opt_no_space_cache, Opt_recovery, Opt_err, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 168 | }; |
| 169 | |
| 170 | static match_table_t tokens = { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 171 | {Opt_degraded, "degraded"}, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 172 | {Opt_subvol, "subvol=%s"}, |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 173 | {Opt_subvolid, "subvolid=%d"}, |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 174 | {Opt_device, "device=%s"}, |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 175 | {Opt_nodatasum, "nodatasum"}, |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 176 | {Opt_nodatacow, "nodatacow"}, |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 177 | {Opt_nobarrier, "nobarrier"}, |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 178 | {Opt_max_inline, "max_inline=%s"}, |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 179 | {Opt_alloc_start, "alloc_start=%s"}, |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 180 | {Opt_thread_pool, "thread_pool=%d"}, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 181 | {Opt_compress, "compress"}, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 182 | {Opt_compress_type, "compress=%s"}, |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 183 | {Opt_compress_force, "compress-force"}, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 184 | {Opt_compress_force_type, "compress-force=%s"}, |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 185 | {Opt_ssd, "ssd"}, |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 186 | {Opt_ssd_spread, "ssd_spread"}, |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 187 | {Opt_nossd, "nossd"}, |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 188 | {Opt_noacl, "noacl"}, |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 189 | {Opt_notreelog, "notreelog"}, |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 190 | {Opt_flushoncommit, "flushoncommit"}, |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 191 | {Opt_ratio, "metadata_ratio=%d"}, |
Christoph Hellwig | e244a0a | 2009-10-14 09:24:59 -0400 | [diff] [blame] | 192 | {Opt_discard, "discard"}, |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 193 | {Opt_space_cache, "space_cache"}, |
Josef Bacik | 88c2ba3 | 2010-09-21 14:21:34 -0400 | [diff] [blame] | 194 | {Opt_clear_cache, "clear_cache"}, |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 195 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
Chris Mason | 9143565 | 2011-02-16 13:10:41 -0500 | [diff] [blame] | 196 | {Opt_enospc_debug, "enospc_debug"}, |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 197 | {Opt_subvolrootid, "subvolrootid=%d"}, |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 198 | {Opt_defrag, "autodefrag"}, |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 199 | {Opt_inode_cache, "inode_cache"}, |
David Sterba | 8965593 | 2011-11-11 10:14:57 -0500 | [diff] [blame] | 200 | {Opt_no_space_cache, "nospace_cache"}, |
Chris Mason | af31f5e | 2011-11-03 15:17:42 -0400 | [diff] [blame] | 201 | {Opt_recovery, "recovery"}, |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 202 | {Opt_err, NULL}, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 203 | }; |
| 204 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 205 | /* |
| 206 | * Regular mount options parser. Everything that is needed only when |
| 207 | * reading in a new superblock is parsed here. |
| 208 | */ |
| 209 | int btrfs_parse_options(struct btrfs_root *root, char *options) |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 210 | { |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 211 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 212 | substring_t args[MAX_OPT_ARGS]; |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 213 | char *p, *num, *orig = NULL; |
| 214 | u64 cache_gen; |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 215 | int intarg; |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 216 | int ret = 0; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 217 | char *compress_type; |
| 218 | bool compress_force = false; |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 219 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 220 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 221 | if (cache_gen) |
| 222 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
| 223 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 224 | if (!options) |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 225 | goto out; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 226 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 227 | /* |
| 228 | * strsep changes the string, duplicate it because parse_options |
| 229 | * gets called twice |
| 230 | */ |
| 231 | options = kstrdup(options, GFP_NOFS); |
| 232 | if (!options) |
| 233 | return -ENOMEM; |
| 234 | |
Josef Bacik | da495ec | 2010-02-25 20:38:35 +0000 | [diff] [blame] | 235 | orig = options; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 236 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 237 | while ((p = strsep(&options, ",")) != NULL) { |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 238 | int token; |
| 239 | if (!*p) |
| 240 | continue; |
| 241 | |
| 242 | token = match_token(p, tokens, args); |
| 243 | switch (token) { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 244 | case Opt_degraded: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 245 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
| 246 | btrfs_set_opt(info->mount_opt, DEGRADED); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 247 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 248 | case Opt_subvol: |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 249 | case Opt_subvolid: |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 250 | case Opt_subvolrootid: |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 251 | case Opt_device: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 252 | /* |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 253 | * These are parsed by btrfs_parse_early_options |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 254 | * and can be happily ignored here. |
| 255 | */ |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 256 | break; |
| 257 | case Opt_nodatasum: |
Chris Mason | 067c28a | 2009-06-11 09:30:13 -0400 | [diff] [blame] | 258 | printk(KERN_INFO "btrfs: setting nodatasum\n"); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 259 | btrfs_set_opt(info->mount_opt, NODATASUM); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 260 | break; |
| 261 | case Opt_nodatacow: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 262 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
| 263 | btrfs_set_opt(info->mount_opt, NODATACOW); |
| 264 | btrfs_set_opt(info->mount_opt, NODATASUM); |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 265 | break; |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 266 | case Opt_compress_force: |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 267 | case Opt_compress_force_type: |
| 268 | compress_force = true; |
| 269 | case Opt_compress: |
| 270 | case Opt_compress_type: |
| 271 | if (token == Opt_compress || |
| 272 | token == Opt_compress_force || |
| 273 | strcmp(args[0].from, "zlib") == 0) { |
| 274 | compress_type = "zlib"; |
| 275 | info->compress_type = BTRFS_COMPRESS_ZLIB; |
Li Zefan | a6fa6fa | 2010-10-25 15:12:26 +0800 | [diff] [blame] | 276 | } else if (strcmp(args[0].from, "lzo") == 0) { |
| 277 | compress_type = "lzo"; |
| 278 | info->compress_type = BTRFS_COMPRESS_LZO; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 279 | } else { |
| 280 | ret = -EINVAL; |
| 281 | goto out; |
| 282 | } |
| 283 | |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 284 | btrfs_set_opt(info->mount_opt, COMPRESS); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 285 | if (compress_force) { |
| 286 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); |
| 287 | pr_info("btrfs: force %s compression\n", |
| 288 | compress_type); |
| 289 | } else |
| 290 | pr_info("btrfs: use %s compression\n", |
| 291 | compress_type); |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 292 | break; |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 293 | case Opt_ssd: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 294 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
| 295 | btrfs_set_opt(info->mount_opt, SSD); |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 296 | break; |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 297 | case Opt_ssd_spread: |
| 298 | printk(KERN_INFO "btrfs: use spread ssd " |
| 299 | "allocation scheme\n"); |
| 300 | btrfs_set_opt(info->mount_opt, SSD); |
| 301 | btrfs_set_opt(info->mount_opt, SSD_SPREAD); |
| 302 | break; |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 303 | case Opt_nossd: |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 304 | printk(KERN_INFO "btrfs: not using ssd allocation " |
| 305 | "scheme\n"); |
Chris Mason | c289811 | 2009-06-10 09:51:32 -0400 | [diff] [blame] | 306 | btrfs_set_opt(info->mount_opt, NOSSD); |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 307 | btrfs_clear_opt(info->mount_opt, SSD); |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 308 | btrfs_clear_opt(info->mount_opt, SSD_SPREAD); |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 309 | break; |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 310 | case Opt_nobarrier: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 311 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
| 312 | btrfs_set_opt(info->mount_opt, NOBARRIER); |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 313 | break; |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 314 | case Opt_thread_pool: |
| 315 | intarg = 0; |
| 316 | match_int(&args[0], &intarg); |
| 317 | if (intarg) { |
| 318 | info->thread_pool_size = intarg; |
| 319 | printk(KERN_INFO "btrfs: thread pool %d\n", |
| 320 | info->thread_pool_size); |
| 321 | } |
| 322 | break; |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 323 | case Opt_max_inline: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 324 | num = match_strdup(&args[0]); |
| 325 | if (num) { |
Akinobu Mita | 9174846 | 2010-02-28 10:59:11 +0000 | [diff] [blame] | 326 | info->max_inline = memparse(num, NULL); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 327 | kfree(num); |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 328 | |
Chris Mason | 15ada04 | 2008-06-11 16:51:38 -0400 | [diff] [blame] | 329 | if (info->max_inline) { |
| 330 | info->max_inline = max_t(u64, |
| 331 | info->max_inline, |
| 332 | root->sectorsize); |
| 333 | } |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 334 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 335 | (unsigned long long)info->max_inline); |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 336 | } |
| 337 | break; |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 338 | case Opt_alloc_start: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 339 | num = match_strdup(&args[0]); |
| 340 | if (num) { |
Akinobu Mita | 9174846 | 2010-02-28 10:59:11 +0000 | [diff] [blame] | 341 | info->alloc_start = memparse(num, NULL); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 342 | kfree(num); |
| 343 | printk(KERN_INFO |
| 344 | "btrfs: allocations start at %llu\n", |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 345 | (unsigned long long)info->alloc_start); |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 346 | } |
| 347 | break; |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 348 | case Opt_noacl: |
| 349 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; |
| 350 | break; |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 351 | case Opt_notreelog: |
| 352 | printk(KERN_INFO "btrfs: disabling tree log\n"); |
| 353 | btrfs_set_opt(info->mount_opt, NOTREELOG); |
| 354 | break; |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 355 | case Opt_flushoncommit: |
| 356 | printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); |
| 357 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); |
| 358 | break; |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 359 | case Opt_ratio: |
| 360 | intarg = 0; |
| 361 | match_int(&args[0], &intarg); |
| 362 | if (intarg) { |
| 363 | info->metadata_ratio = intarg; |
| 364 | printk(KERN_INFO "btrfs: metadata ratio %d\n", |
| 365 | info->metadata_ratio); |
| 366 | } |
| 367 | break; |
Christoph Hellwig | e244a0a | 2009-10-14 09:24:59 -0400 | [diff] [blame] | 368 | case Opt_discard: |
| 369 | btrfs_set_opt(info->mount_opt, DISCARD); |
| 370 | break; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 371 | case Opt_space_cache: |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 372 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
Josef Bacik | 0de9087 | 2010-11-19 13:40:41 +0000 | [diff] [blame] | 373 | break; |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 374 | case Opt_no_space_cache: |
| 375 | printk(KERN_INFO "btrfs: disabling disk space caching\n"); |
| 376 | btrfs_clear_opt(info->mount_opt, SPACE_CACHE); |
| 377 | break; |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 378 | case Opt_inode_cache: |
| 379 | printk(KERN_INFO "btrfs: enabling inode map caching\n"); |
| 380 | btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE); |
| 381 | break; |
Josef Bacik | 88c2ba3 | 2010-09-21 14:21:34 -0400 | [diff] [blame] | 382 | case Opt_clear_cache: |
| 383 | printk(KERN_INFO "btrfs: force clearing of disk cache\n"); |
| 384 | btrfs_set_opt(info->mount_opt, CLEAR_CACHE); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 385 | break; |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 386 | case Opt_user_subvol_rm_allowed: |
| 387 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); |
| 388 | break; |
Chris Mason | 9143565 | 2011-02-16 13:10:41 -0500 | [diff] [blame] | 389 | case Opt_enospc_debug: |
| 390 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); |
| 391 | break; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 392 | case Opt_defrag: |
| 393 | printk(KERN_INFO "btrfs: enabling auto defrag"); |
| 394 | btrfs_set_opt(info->mount_opt, AUTO_DEFRAG); |
| 395 | break; |
Chris Mason | af31f5e | 2011-11-03 15:17:42 -0400 | [diff] [blame] | 396 | case Opt_recovery: |
| 397 | printk(KERN_INFO "btrfs: enabling auto recovery"); |
| 398 | btrfs_set_opt(info->mount_opt, RECOVERY); |
| 399 | break; |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 400 | case Opt_err: |
| 401 | printk(KERN_INFO "btrfs: unrecognized mount option " |
| 402 | "'%s'\n", p); |
| 403 | ret = -EINVAL; |
| 404 | goto out; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 405 | default: |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 406 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 407 | } |
| 408 | } |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 409 | out: |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 410 | if (!ret && btrfs_test_opt(root, SPACE_CACHE)) |
| 411 | printk(KERN_INFO "btrfs: disk space caching is enabled\n"); |
Josef Bacik | da495ec | 2010-02-25 20:38:35 +0000 | [diff] [blame] | 412 | kfree(orig); |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 413 | return ret; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 414 | } |
| 415 | |
| 416 | /* |
| 417 | * Parse mount options that are required early in the mount process. |
| 418 | * |
| 419 | * All other options will be parsed on much later in the mount process and |
| 420 | * only when we need to allocate a new super block. |
| 421 | */ |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 422 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 423 | void *holder, char **subvol_name, u64 *subvol_objectid, |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 424 | u64 *subvol_rootid, struct btrfs_fs_devices **fs_devices) |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 425 | { |
| 426 | substring_t args[MAX_OPT_ARGS]; |
Jeff Liu | 83c8c9b | 2011-09-14 14:11:21 +0800 | [diff] [blame] | 427 | char *device_name, *opts, *orig, *p; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 428 | int error = 0; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 429 | int intarg; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 430 | |
| 431 | if (!options) |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 432 | return 0; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 433 | |
| 434 | /* |
| 435 | * strsep changes the string, duplicate it because parse_options |
| 436 | * gets called twice |
| 437 | */ |
| 438 | opts = kstrdup(options, GFP_KERNEL); |
| 439 | if (!opts) |
| 440 | return -ENOMEM; |
Tero Roponen | 3f3d0bc | 2010-12-27 16:43:13 +0800 | [diff] [blame] | 441 | orig = opts; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 442 | |
| 443 | while ((p = strsep(&opts, ",")) != NULL) { |
| 444 | int token; |
| 445 | if (!*p) |
| 446 | continue; |
| 447 | |
| 448 | token = match_token(p, tokens, args); |
| 449 | switch (token) { |
| 450 | case Opt_subvol: |
Ilya Dryomov | a90e8b6 | 2011-11-08 16:47:55 +0200 | [diff] [blame] | 451 | kfree(*subvol_name); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 452 | *subvol_name = match_strdup(&args[0]); |
| 453 | break; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 454 | case Opt_subvolid: |
| 455 | intarg = 0; |
Josef Bacik | 4849f01 | 2009-12-14 19:18:38 +0000 | [diff] [blame] | 456 | error = match_int(&args[0], &intarg); |
| 457 | if (!error) { |
| 458 | /* we want the original fs_tree */ |
| 459 | if (!intarg) |
| 460 | *subvol_objectid = |
| 461 | BTRFS_FS_TREE_OBJECTID; |
| 462 | else |
| 463 | *subvol_objectid = intarg; |
| 464 | } |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 465 | break; |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 466 | case Opt_subvolrootid: |
| 467 | intarg = 0; |
| 468 | error = match_int(&args[0], &intarg); |
| 469 | if (!error) { |
| 470 | /* we want the original fs_tree */ |
| 471 | if (!intarg) |
| 472 | *subvol_rootid = |
| 473 | BTRFS_FS_TREE_OBJECTID; |
| 474 | else |
| 475 | *subvol_rootid = intarg; |
| 476 | } |
| 477 | break; |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 478 | case Opt_device: |
Jeff Liu | 83c8c9b | 2011-09-14 14:11:21 +0800 | [diff] [blame] | 479 | device_name = match_strdup(&args[0]); |
| 480 | if (!device_name) { |
| 481 | error = -ENOMEM; |
| 482 | goto out; |
| 483 | } |
| 484 | error = btrfs_scan_one_device(device_name, |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 485 | flags, holder, fs_devices); |
Jeff Liu | 83c8c9b | 2011-09-14 14:11:21 +0800 | [diff] [blame] | 486 | kfree(device_name); |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 487 | if (error) |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 488 | goto out; |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 489 | break; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 490 | default: |
| 491 | break; |
| 492 | } |
| 493 | } |
| 494 | |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 495 | out: |
Tero Roponen | 3f3d0bc | 2010-12-27 16:43:13 +0800 | [diff] [blame] | 496 | kfree(orig); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 497 | return error; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 498 | } |
| 499 | |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 500 | static struct dentry *get_default_root(struct super_block *sb, |
| 501 | u64 subvol_objectid) |
| 502 | { |
| 503 | struct btrfs_root *root = sb->s_fs_info; |
| 504 | struct btrfs_root *new_root; |
| 505 | struct btrfs_dir_item *di; |
| 506 | struct btrfs_path *path; |
| 507 | struct btrfs_key location; |
| 508 | struct inode *inode; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 509 | u64 dir_id; |
| 510 | int new = 0; |
| 511 | |
| 512 | /* |
| 513 | * We have a specific subvol we want to mount, just setup location and |
| 514 | * go look up the root. |
| 515 | */ |
| 516 | if (subvol_objectid) { |
| 517 | location.objectid = subvol_objectid; |
| 518 | location.type = BTRFS_ROOT_ITEM_KEY; |
| 519 | location.offset = (u64)-1; |
| 520 | goto find_root; |
| 521 | } |
| 522 | |
| 523 | path = btrfs_alloc_path(); |
| 524 | if (!path) |
| 525 | return ERR_PTR(-ENOMEM); |
| 526 | path->leave_spinning = 1; |
| 527 | |
| 528 | /* |
| 529 | * Find the "default" dir item which points to the root item that we |
| 530 | * will mount by default if we haven't been given a specific subvolume |
| 531 | * to mount. |
| 532 | */ |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 533 | dir_id = btrfs_super_root_dir(root->fs_info->super_copy); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 534 | di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); |
Julia Lawall | b083916 | 2011-05-14 07:10:51 +0000 | [diff] [blame] | 535 | if (IS_ERR(di)) { |
| 536 | btrfs_free_path(path); |
Dan Carpenter | fb4f6f9 | 2010-05-29 09:40:57 +0000 | [diff] [blame] | 537 | return ERR_CAST(di); |
Julia Lawall | b083916 | 2011-05-14 07:10:51 +0000 | [diff] [blame] | 538 | } |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 539 | if (!di) { |
| 540 | /* |
| 541 | * Ok the default dir item isn't there. This is weird since |
| 542 | * it's always been there, but don't freak out, just try and |
| 543 | * mount to root most subvolume. |
| 544 | */ |
| 545 | btrfs_free_path(path); |
| 546 | dir_id = BTRFS_FIRST_FREE_OBJECTID; |
| 547 | new_root = root->fs_info->fs_root; |
| 548 | goto setup_root; |
| 549 | } |
| 550 | |
| 551 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); |
| 552 | btrfs_free_path(path); |
| 553 | |
| 554 | find_root: |
| 555 | new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); |
| 556 | if (IS_ERR(new_root)) |
Julia Lawall | d0b678c | 2010-10-29 15:14:23 -0400 | [diff] [blame] | 557 | return ERR_CAST(new_root); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 558 | |
| 559 | if (btrfs_root_refs(&new_root->root_item) == 0) |
| 560 | return ERR_PTR(-ENOENT); |
| 561 | |
| 562 | dir_id = btrfs_root_dirid(&new_root->root_item); |
| 563 | setup_root: |
| 564 | location.objectid = dir_id; |
| 565 | location.type = BTRFS_INODE_ITEM_KEY; |
| 566 | location.offset = 0; |
| 567 | |
| 568 | inode = btrfs_iget(sb, &location, new_root, &new); |
Dan Carpenter | 4cbd114 | 2010-05-29 09:42:19 +0000 | [diff] [blame] | 569 | if (IS_ERR(inode)) |
| 570 | return ERR_CAST(inode); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 571 | |
| 572 | /* |
| 573 | * If we're just mounting the root most subvol put the inode and return |
| 574 | * a reference to the dentry. We will have already gotten a reference |
| 575 | * to the inode in btrfs_fill_super so we're good to go. |
| 576 | */ |
| 577 | if (!new && sb->s_root->d_inode == inode) { |
| 578 | iput(inode); |
| 579 | return dget(sb->s_root); |
| 580 | } |
| 581 | |
Josef Bacik | ba5b895 | 2011-07-25 15:40:35 -0400 | [diff] [blame] | 582 | return d_obtain_alias(inode); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 583 | } |
| 584 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 585 | static int btrfs_fill_super(struct super_block *sb, |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 586 | struct btrfs_fs_devices *fs_devices, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 587 | void *data, int silent) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 588 | { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 589 | struct inode *inode; |
| 590 | struct dentry *root_dentry; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 591 | struct btrfs_root *tree_root; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 592 | struct btrfs_key key; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 593 | int err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 594 | |
| 595 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 596 | sb->s_magic = BTRFS_SUPER_MAGIC; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 597 | sb->s_op = &btrfs_super_ops; |
Al Viro | af53d29 | 2010-12-20 10:56:06 -0500 | [diff] [blame] | 598 | sb->s_d_op = &btrfs_dentry_operations; |
Balaji Rao | be6e8dc | 2008-07-21 02:01:56 +0530 | [diff] [blame] | 599 | sb->s_export_op = &btrfs_export_ops; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 600 | sb->s_xattr = btrfs_xattr_handlers; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 601 | sb->s_time_gran = 1; |
Chris Mason | 0eda294 | 2009-10-13 13:50:18 -0400 | [diff] [blame] | 602 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 603 | sb->s_flags |= MS_POSIXACL; |
Chris Ball | 49cf6f4 | 2009-09-29 13:51:04 -0400 | [diff] [blame] | 604 | #endif |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 605 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 606 | tree_root = open_ctree(sb, fs_devices, (char *)data); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 607 | |
Yan | e58ca02 | 2008-04-01 11:21:34 -0400 | [diff] [blame] | 608 | if (IS_ERR(tree_root)) { |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 609 | printk("btrfs: open_ctree failed\n"); |
Yan | e58ca02 | 2008-04-01 11:21:34 -0400 | [diff] [blame] | 610 | return PTR_ERR(tree_root); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 611 | } |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 612 | sb->s_fs_info = tree_root; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 613 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 614 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
| 615 | key.type = BTRFS_INODE_ITEM_KEY; |
| 616 | key.offset = 0; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 617 | inode = btrfs_iget(sb, &key, tree_root->fs_info->fs_root, NULL); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 618 | if (IS_ERR(inode)) { |
| 619 | err = PTR_ERR(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 620 | goto fail_close; |
| 621 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 622 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 623 | root_dentry = d_alloc_root(inode); |
| 624 | if (!root_dentry) { |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 625 | iput(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 626 | err = -ENOMEM; |
| 627 | goto fail_close; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 628 | } |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 629 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 630 | sb->s_root = root_dentry; |
Chris Mason | 6885f30 | 2008-02-20 16:11:05 -0500 | [diff] [blame] | 631 | |
Chris Mason | 6885f30 | 2008-02-20 16:11:05 -0500 | [diff] [blame] | 632 | save_mount_options(sb, data); |
Dan Magenheimer | 90a887c | 2011-05-26 10:01:56 -0600 | [diff] [blame] | 633 | cleancache_init_fs(sb); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 634 | return 0; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 635 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 636 | fail_close: |
| 637 | close_ctree(tree_root); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 638 | return err; |
| 639 | } |
| 640 | |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 641 | int btrfs_sync_fs(struct super_block *sb, int wait) |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 642 | { |
| 643 | struct btrfs_trans_handle *trans; |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 644 | struct btrfs_root *root = btrfs_sb(sb); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 645 | int ret; |
Chris Mason | df2ce34 | 2007-03-23 11:00:45 -0400 | [diff] [blame] | 646 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 647 | trace_btrfs_sync_fs(wait); |
| 648 | |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 649 | if (!wait) { |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 650 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 651 | return 0; |
| 652 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 653 | |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 654 | btrfs_start_delalloc_inodes(root, 0); |
| 655 | btrfs_wait_ordered_extents(root, 0, 0); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 656 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 657 | trans = btrfs_start_transaction(root, 0); |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 658 | if (IS_ERR(trans)) |
| 659 | return PTR_ERR(trans); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 660 | ret = btrfs_commit_transaction(trans, root); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 661 | return ret; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 662 | } |
| 663 | |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame^] | 664 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 665 | { |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame^] | 666 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 667 | struct btrfs_fs_info *info = root->fs_info; |
Tsutomu Itoh | 200da64 | 2011-03-31 00:44:29 +0000 | [diff] [blame] | 668 | char *compress_type; |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 669 | |
| 670 | if (btrfs_test_opt(root, DEGRADED)) |
| 671 | seq_puts(seq, ",degraded"); |
| 672 | if (btrfs_test_opt(root, NODATASUM)) |
| 673 | seq_puts(seq, ",nodatasum"); |
| 674 | if (btrfs_test_opt(root, NODATACOW)) |
| 675 | seq_puts(seq, ",nodatacow"); |
| 676 | if (btrfs_test_opt(root, NOBARRIER)) |
| 677 | seq_puts(seq, ",nobarrier"); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 678 | if (info->max_inline != 8192 * 1024) |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 679 | seq_printf(seq, ",max_inline=%llu", |
| 680 | (unsigned long long)info->max_inline); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 681 | if (info->alloc_start != 0) |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 682 | seq_printf(seq, ",alloc_start=%llu", |
| 683 | (unsigned long long)info->alloc_start); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 684 | if (info->thread_pool_size != min_t(unsigned long, |
| 685 | num_online_cpus() + 2, 8)) |
| 686 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); |
Tsutomu Itoh | 200da64 | 2011-03-31 00:44:29 +0000 | [diff] [blame] | 687 | if (btrfs_test_opt(root, COMPRESS)) { |
| 688 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) |
| 689 | compress_type = "zlib"; |
| 690 | else |
| 691 | compress_type = "lzo"; |
| 692 | if (btrfs_test_opt(root, FORCE_COMPRESS)) |
| 693 | seq_printf(seq, ",compress-force=%s", compress_type); |
| 694 | else |
| 695 | seq_printf(seq, ",compress=%s", compress_type); |
| 696 | } |
Chris Mason | c289811 | 2009-06-10 09:51:32 -0400 | [diff] [blame] | 697 | if (btrfs_test_opt(root, NOSSD)) |
| 698 | seq_puts(seq, ",nossd"); |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 699 | if (btrfs_test_opt(root, SSD_SPREAD)) |
| 700 | seq_puts(seq, ",ssd_spread"); |
| 701 | else if (btrfs_test_opt(root, SSD)) |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 702 | seq_puts(seq, ",ssd"); |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 703 | if (btrfs_test_opt(root, NOTREELOG)) |
Sage Weil | 6b65c5c | 2009-05-14 13:52:21 -0400 | [diff] [blame] | 704 | seq_puts(seq, ",notreelog"); |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 705 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
Sage Weil | 6b65c5c | 2009-05-14 13:52:21 -0400 | [diff] [blame] | 706 | seq_puts(seq, ",flushoncommit"); |
Matthew Wilcox | 20a5239 | 2009-12-14 22:01:12 +0000 | [diff] [blame] | 707 | if (btrfs_test_opt(root, DISCARD)) |
| 708 | seq_puts(seq, ",discard"); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 709 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
| 710 | seq_puts(seq, ",noacl"); |
Tsutomu Itoh | 200da64 | 2011-03-31 00:44:29 +0000 | [diff] [blame] | 711 | if (btrfs_test_opt(root, SPACE_CACHE)) |
| 712 | seq_puts(seq, ",space_cache"); |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 713 | else |
David Sterba | 8965593 | 2011-11-11 10:14:57 -0500 | [diff] [blame] | 714 | seq_puts(seq, ",nospace_cache"); |
Tsutomu Itoh | 200da64 | 2011-03-31 00:44:29 +0000 | [diff] [blame] | 715 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
| 716 | seq_puts(seq, ",clear_cache"); |
| 717 | if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) |
| 718 | seq_puts(seq, ",user_subvol_rm_allowed"); |
David Sterba | 0942caa | 2011-06-28 15:10:37 +0000 | [diff] [blame] | 719 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) |
| 720 | seq_puts(seq, ",enospc_debug"); |
| 721 | if (btrfs_test_opt(root, AUTO_DEFRAG)) |
| 722 | seq_puts(seq, ",autodefrag"); |
| 723 | if (btrfs_test_opt(root, INODE_MAP_CACHE)) |
| 724 | seq_puts(seq, ",inode_cache"); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 725 | return 0; |
| 726 | } |
| 727 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 728 | static int btrfs_test_super(struct super_block *s, void *data) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 729 | { |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 730 | struct btrfs_root *test_root = data; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 731 | struct btrfs_root *root = btrfs_sb(s); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 732 | |
Ian Kent | 619c8c7 | 2010-11-22 02:21:38 +0000 | [diff] [blame] | 733 | /* |
| 734 | * If this super block is going away, return false as it |
| 735 | * can't match as an existing super block. |
| 736 | */ |
| 737 | if (!atomic_read(&s->s_active)) |
| 738 | return 0; |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 739 | return root->fs_info->fs_devices == test_root->fs_info->fs_devices; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 740 | } |
| 741 | |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 742 | static int btrfs_set_super(struct super_block *s, void *data) |
| 743 | { |
| 744 | s->s_fs_info = data; |
| 745 | |
| 746 | return set_anon_super(s, data); |
| 747 | } |
| 748 | |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 749 | /* |
David Sterba | f9d9ef6 | 2011-09-29 13:11:33 +0200 | [diff] [blame] | 750 | * subvolumes are identified by ino 256 |
| 751 | */ |
| 752 | static inline int is_subvolume_inode(struct inode *inode) |
| 753 | { |
| 754 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) |
| 755 | return 1; |
| 756 | return 0; |
| 757 | } |
| 758 | |
| 759 | /* |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 760 | * This will strip out the subvol=%s argument for an argument string and add |
| 761 | * subvolid=0 to make sure we get the actual tree root for path walking to the |
| 762 | * subvol we want. |
| 763 | */ |
| 764 | static char *setup_root_args(char *args) |
| 765 | { |
| 766 | unsigned copied = 0; |
| 767 | unsigned len = strlen(args) + 2; |
| 768 | char *pos; |
| 769 | char *ret; |
| 770 | |
| 771 | /* |
| 772 | * We need the same args as before, but minus |
| 773 | * |
| 774 | * subvol=a |
| 775 | * |
| 776 | * and add |
| 777 | * |
| 778 | * subvolid=0 |
| 779 | * |
| 780 | * which is a difference of 2 characters, so we allocate strlen(args) + |
| 781 | * 2 characters. |
| 782 | */ |
| 783 | ret = kzalloc(len * sizeof(char), GFP_NOFS); |
| 784 | if (!ret) |
| 785 | return NULL; |
| 786 | pos = strstr(args, "subvol="); |
| 787 | |
| 788 | /* This shouldn't happen, but just in case.. */ |
| 789 | if (!pos) { |
| 790 | kfree(ret); |
| 791 | return NULL; |
| 792 | } |
| 793 | |
| 794 | /* |
| 795 | * The subvol=<> arg is not at the front of the string, copy everybody |
| 796 | * up to that into ret. |
| 797 | */ |
| 798 | if (pos != args) { |
| 799 | *pos = '\0'; |
| 800 | strcpy(ret, args); |
| 801 | copied += strlen(args); |
| 802 | pos++; |
| 803 | } |
| 804 | |
| 805 | strncpy(ret + copied, "subvolid=0", len - copied); |
| 806 | |
| 807 | /* Length of subvolid=0 */ |
| 808 | copied += 10; |
| 809 | |
| 810 | /* |
| 811 | * If there is no , after the subvol= option then we know there's no |
| 812 | * other options and we can just return. |
| 813 | */ |
| 814 | pos = strchr(pos, ','); |
| 815 | if (!pos) |
| 816 | return ret; |
| 817 | |
| 818 | /* Copy the rest of the arguments into our buffer */ |
| 819 | strncpy(ret + copied, pos, len - copied); |
| 820 | copied += strlen(pos); |
| 821 | |
| 822 | return ret; |
| 823 | } |
| 824 | |
| 825 | static struct dentry *mount_subvol(const char *subvol_name, int flags, |
| 826 | const char *device_name, char *data) |
| 827 | { |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 828 | struct dentry *root; |
| 829 | struct vfsmount *mnt; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 830 | char *newargs; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 831 | |
| 832 | newargs = setup_root_args(data); |
| 833 | if (!newargs) |
| 834 | return ERR_PTR(-ENOMEM); |
| 835 | mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, |
| 836 | newargs); |
| 837 | kfree(newargs); |
| 838 | if (IS_ERR(mnt)) |
| 839 | return ERR_CAST(mnt); |
| 840 | |
Al Viro | ea441d1 | 2011-11-16 21:43:59 -0500 | [diff] [blame] | 841 | root = mount_subtree(mnt, subvol_name); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 842 | |
Al Viro | ea441d1 | 2011-11-16 21:43:59 -0500 | [diff] [blame] | 843 | if (!IS_ERR(root) && !is_subvolume_inode(root->d_inode)) { |
| 844 | struct super_block *s = root->d_sb; |
| 845 | dput(root); |
| 846 | root = ERR_PTR(-EINVAL); |
| 847 | deactivate_locked_super(s); |
David Sterba | f9d9ef6 | 2011-09-29 13:11:33 +0200 | [diff] [blame] | 848 | printk(KERN_ERR "btrfs: '%s' is not a valid subvolume\n", |
| 849 | subvol_name); |
David Sterba | f9d9ef6 | 2011-09-29 13:11:33 +0200 | [diff] [blame] | 850 | } |
| 851 | |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 852 | return root; |
| 853 | } |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 854 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 855 | /* |
| 856 | * Find a superblock for the given device / mount point. |
| 857 | * |
| 858 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions |
| 859 | * for multiple device setup. Make sure to keep it in sync. |
| 860 | */ |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 861 | static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags, |
David Sterba | 306e16c | 2011-04-19 14:29:38 +0200 | [diff] [blame] | 862 | const char *device_name, void *data) |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 863 | { |
| 864 | struct block_device *bdev = NULL; |
| 865 | struct super_block *s; |
| 866 | struct dentry *root; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 867 | struct btrfs_fs_devices *fs_devices = NULL; |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 868 | struct btrfs_fs_info *fs_info = NULL; |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 869 | fmode_t mode = FMODE_READ; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 870 | char *subvol_name = NULL; |
| 871 | u64 subvol_objectid = 0; |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 872 | u64 subvol_rootid = 0; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 873 | int error = 0; |
| 874 | |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 875 | if (!(flags & MS_RDONLY)) |
| 876 | mode |= FMODE_WRITE; |
| 877 | |
| 878 | error = btrfs_parse_early_options(data, mode, fs_type, |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 879 | &subvol_name, &subvol_objectid, |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 880 | &subvol_rootid, &fs_devices); |
Ilya Dryomov | f23c8af | 2011-11-08 19:15:05 +0200 | [diff] [blame] | 881 | if (error) { |
| 882 | kfree(subvol_name); |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 883 | return ERR_PTR(error); |
Ilya Dryomov | f23c8af | 2011-11-08 19:15:05 +0200 | [diff] [blame] | 884 | } |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 885 | |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 886 | if (subvol_name) { |
| 887 | root = mount_subvol(subvol_name, flags, device_name, data); |
| 888 | kfree(subvol_name); |
| 889 | return root; |
| 890 | } |
| 891 | |
David Sterba | 306e16c | 2011-04-19 14:29:38 +0200 | [diff] [blame] | 892 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 893 | if (error) |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 894 | return ERR_PTR(error); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 895 | |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 896 | /* |
| 897 | * Setup a dummy root and fs_info for test/set super. This is because |
| 898 | * we don't actually fill this stuff out until open_ctree, but we need |
| 899 | * it for searching for existing supers, so this lets us do that and |
| 900 | * then open_ctree will properly initialize everything later. |
| 901 | */ |
| 902 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); |
Ilya Dryomov | 04d21a2 | 2011-11-09 14:41:22 +0200 | [diff] [blame] | 903 | if (!fs_info) |
| 904 | return ERR_PTR(-ENOMEM); |
| 905 | |
| 906 | fs_info->tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS); |
| 907 | if (!fs_info->tree_root) { |
slyich@gmail.com | 45ea609 | 2011-11-07 16:08:01 -0500 | [diff] [blame] | 908 | error = -ENOMEM; |
Ilya Dryomov | 04d21a2 | 2011-11-09 14:41:22 +0200 | [diff] [blame] | 909 | goto error_fs_info; |
slyich@gmail.com | 45ea609 | 2011-11-07 16:08:01 -0500 | [diff] [blame] | 910 | } |
Ilya Dryomov | 04d21a2 | 2011-11-09 14:41:22 +0200 | [diff] [blame] | 911 | fs_info->tree_root->fs_info = fs_info; |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 912 | fs_info->fs_devices = fs_devices; |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 913 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 914 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
| 915 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
| 916 | if (!fs_info->super_copy || !fs_info->super_for_commit) { |
| 917 | error = -ENOMEM; |
Ilya Dryomov | 04d21a2 | 2011-11-09 14:41:22 +0200 | [diff] [blame] | 918 | goto error_fs_info; |
| 919 | } |
| 920 | |
| 921 | error = btrfs_open_devices(fs_devices, mode, fs_type); |
| 922 | if (error) |
| 923 | goto error_fs_info; |
| 924 | |
| 925 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { |
| 926 | error = -EACCES; |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 927 | goto error_close_devices; |
| 928 | } |
| 929 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 930 | bdev = fs_devices->latest_bdev; |
Ilya Dryomov | 04d21a2 | 2011-11-09 14:41:22 +0200 | [diff] [blame] | 931 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, |
| 932 | fs_info->tree_root); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 933 | if (IS_ERR(s)) { |
| 934 | error = PTR_ERR(s); |
| 935 | goto error_close_devices; |
| 936 | } |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 937 | |
| 938 | if (s->s_root) { |
| 939 | if ((flags ^ s->s_flags) & MS_RDONLY) { |
Al Viro | 6f5bbff | 2009-05-06 01:34:22 -0400 | [diff] [blame] | 940 | deactivate_locked_super(s); |
Ilya Dryomov | 04d21a2 | 2011-11-09 14:41:22 +0200 | [diff] [blame] | 941 | error = -EBUSY; |
| 942 | goto error_close_devices; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 943 | } |
| 944 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 945 | btrfs_close_devices(fs_devices); |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 946 | free_fs_info(fs_info); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 947 | } else { |
| 948 | char b[BDEVNAME_SIZE]; |
| 949 | |
Al Viro | 9e1f1de | 2011-06-03 18:24:58 -0400 | [diff] [blame] | 950 | s->s_flags = flags | MS_NOSEC; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 951 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
Ilya Dryomov | 5f52444 | 2011-10-13 00:20:43 +0300 | [diff] [blame] | 952 | btrfs_sb(s)->fs_info->bdev_holder = fs_type; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 953 | error = btrfs_fill_super(s, fs_devices, data, |
| 954 | flags & MS_SILENT ? 1 : 0); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 955 | if (error) { |
Al Viro | 6f5bbff | 2009-05-06 01:34:22 -0400 | [diff] [blame] | 956 | deactivate_locked_super(s); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 957 | return ERR_PTR(error); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 958 | } |
| 959 | |
| 960 | s->s_flags |= MS_ACTIVE; |
| 961 | } |
| 962 | |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 963 | root = get_default_root(s, subvol_objectid); |
| 964 | if (IS_ERR(root)) { |
| 965 | deactivate_locked_super(s); |
| 966 | return root; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 967 | } |
| 968 | |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 969 | return root; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 970 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 971 | error_close_devices: |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 972 | btrfs_close_devices(fs_devices); |
Ilya Dryomov | 04d21a2 | 2011-11-09 14:41:22 +0200 | [diff] [blame] | 973 | error_fs_info: |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 974 | free_fs_info(fs_info); |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 975 | return ERR_PTR(error); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 976 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 977 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 978 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
| 979 | { |
| 980 | struct btrfs_root *root = btrfs_sb(sb); |
| 981 | int ret; |
| 982 | |
Chris Mason | b288052 | 2009-02-12 09:37:35 -0500 | [diff] [blame] | 983 | ret = btrfs_parse_options(root, data); |
| 984 | if (ret) |
| 985 | return -EINVAL; |
| 986 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 987 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 988 | return 0; |
| 989 | |
| 990 | if (*flags & MS_RDONLY) { |
| 991 | sb->s_flags |= MS_RDONLY; |
| 992 | |
| 993 | ret = btrfs_commit_super(root); |
| 994 | WARN_ON(ret); |
| 995 | } else { |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 996 | if (root->fs_info->fs_devices->rw_devices == 0) |
| 997 | return -EACCES; |
| 998 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 999 | if (btrfs_super_log_root(root->fs_info->super_copy) != 0) |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1000 | return -EINVAL; |
| 1001 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1002 | ret = btrfs_cleanup_fs_roots(root->fs_info); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1003 | WARN_ON(ret); |
| 1004 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1005 | /* recover relocation */ |
| 1006 | ret = btrfs_recover_relocation(root); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1007 | WARN_ON(ret); |
| 1008 | |
| 1009 | sb->s_flags &= ~MS_RDONLY; |
| 1010 | } |
| 1011 | |
| 1012 | return 0; |
| 1013 | } |
| 1014 | |
Arne Jansen | bcd5374 | 2011-04-12 10:43:21 +0200 | [diff] [blame] | 1015 | /* Used to sort the devices by max_avail(descending sort) */ |
| 1016 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, |
| 1017 | const void *dev_info2) |
| 1018 | { |
| 1019 | if (((struct btrfs_device_info *)dev_info1)->max_avail > |
| 1020 | ((struct btrfs_device_info *)dev_info2)->max_avail) |
| 1021 | return -1; |
| 1022 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < |
| 1023 | ((struct btrfs_device_info *)dev_info2)->max_avail) |
| 1024 | return 1; |
| 1025 | else |
| 1026 | return 0; |
| 1027 | } |
| 1028 | |
| 1029 | /* |
| 1030 | * sort the devices by max_avail, in which max free extent size of each device |
| 1031 | * is stored.(Descending Sort) |
| 1032 | */ |
| 1033 | static inline void btrfs_descending_sort_devices( |
| 1034 | struct btrfs_device_info *devices, |
| 1035 | size_t nr_devices) |
| 1036 | { |
| 1037 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), |
| 1038 | btrfs_cmp_device_free_bytes, NULL); |
| 1039 | } |
| 1040 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1041 | /* |
| 1042 | * The helper to calc the free space on the devices that can be used to store |
| 1043 | * file data. |
| 1044 | */ |
| 1045 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) |
| 1046 | { |
| 1047 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1048 | struct btrfs_device_info *devices_info; |
| 1049 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
| 1050 | struct btrfs_device *device; |
| 1051 | u64 skip_space; |
| 1052 | u64 type; |
| 1053 | u64 avail_space; |
| 1054 | u64 used_space; |
| 1055 | u64 min_stripe_size; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1056 | int min_stripes = 1, num_stripes = 1; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1057 | int i = 0, nr_devices; |
| 1058 | int ret; |
| 1059 | |
Li Zefan | b772a86 | 2011-11-28 16:43:00 +0800 | [diff] [blame] | 1060 | nr_devices = fs_info->fs_devices->open_devices; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1061 | BUG_ON(!nr_devices); |
| 1062 | |
| 1063 | devices_info = kmalloc(sizeof(*devices_info) * nr_devices, |
| 1064 | GFP_NOFS); |
| 1065 | if (!devices_info) |
| 1066 | return -ENOMEM; |
| 1067 | |
| 1068 | /* calc min stripe number for data space alloction */ |
| 1069 | type = btrfs_get_alloc_profile(root, 1); |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1070 | if (type & BTRFS_BLOCK_GROUP_RAID0) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1071 | min_stripes = 2; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1072 | num_stripes = nr_devices; |
| 1073 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1074 | min_stripes = 2; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1075 | num_stripes = 2; |
| 1076 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1077 | min_stripes = 4; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1078 | num_stripes = 4; |
| 1079 | } |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1080 | |
| 1081 | if (type & BTRFS_BLOCK_GROUP_DUP) |
| 1082 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; |
| 1083 | else |
| 1084 | min_stripe_size = BTRFS_STRIPE_LEN; |
| 1085 | |
Li Zefan | b772a86 | 2011-11-28 16:43:00 +0800 | [diff] [blame] | 1086 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
| 1087 | if (!device->in_fs_metadata || !device->bdev) |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1088 | continue; |
| 1089 | |
| 1090 | avail_space = device->total_bytes - device->bytes_used; |
| 1091 | |
| 1092 | /* align with stripe_len */ |
| 1093 | do_div(avail_space, BTRFS_STRIPE_LEN); |
| 1094 | avail_space *= BTRFS_STRIPE_LEN; |
| 1095 | |
| 1096 | /* |
| 1097 | * In order to avoid overwritting the superblock on the drive, |
| 1098 | * btrfs starts at an offset of at least 1MB when doing chunk |
| 1099 | * allocation. |
| 1100 | */ |
| 1101 | skip_space = 1024 * 1024; |
| 1102 | |
| 1103 | /* user can set the offset in fs_info->alloc_start. */ |
| 1104 | if (fs_info->alloc_start + BTRFS_STRIPE_LEN <= |
| 1105 | device->total_bytes) |
| 1106 | skip_space = max(fs_info->alloc_start, skip_space); |
| 1107 | |
| 1108 | /* |
| 1109 | * btrfs can not use the free space in [0, skip_space - 1], |
| 1110 | * we must subtract it from the total. In order to implement |
| 1111 | * it, we account the used space in this range first. |
| 1112 | */ |
| 1113 | ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1, |
| 1114 | &used_space); |
| 1115 | if (ret) { |
| 1116 | kfree(devices_info); |
| 1117 | return ret; |
| 1118 | } |
| 1119 | |
| 1120 | /* calc the free space in [0, skip_space - 1] */ |
| 1121 | skip_space -= used_space; |
| 1122 | |
| 1123 | /* |
| 1124 | * we can use the free space in [0, skip_space - 1], subtract |
| 1125 | * it from the total. |
| 1126 | */ |
| 1127 | if (avail_space && avail_space >= skip_space) |
| 1128 | avail_space -= skip_space; |
| 1129 | else |
| 1130 | avail_space = 0; |
| 1131 | |
| 1132 | if (avail_space < min_stripe_size) |
| 1133 | continue; |
| 1134 | |
| 1135 | devices_info[i].dev = device; |
| 1136 | devices_info[i].max_avail = avail_space; |
| 1137 | |
| 1138 | i++; |
| 1139 | } |
| 1140 | |
| 1141 | nr_devices = i; |
| 1142 | |
| 1143 | btrfs_descending_sort_devices(devices_info, nr_devices); |
| 1144 | |
| 1145 | i = nr_devices - 1; |
| 1146 | avail_space = 0; |
| 1147 | while (nr_devices >= min_stripes) { |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1148 | if (num_stripes > nr_devices) |
| 1149 | num_stripes = nr_devices; |
| 1150 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1151 | if (devices_info[i].max_avail >= min_stripe_size) { |
| 1152 | int j; |
| 1153 | u64 alloc_size; |
| 1154 | |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1155 | avail_space += devices_info[i].max_avail * num_stripes; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1156 | alloc_size = devices_info[i].max_avail; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1157 | for (j = i + 1 - num_stripes; j <= i; j++) |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1158 | devices_info[j].max_avail -= alloc_size; |
| 1159 | } |
| 1160 | i--; |
| 1161 | nr_devices--; |
| 1162 | } |
| 1163 | |
| 1164 | kfree(devices_info); |
| 1165 | *free_bytes = avail_space; |
| 1166 | return 0; |
| 1167 | } |
| 1168 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1169 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 1170 | { |
| 1171 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1172 | struct btrfs_super_block *disk_super = root->fs_info->super_copy; |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 1173 | struct list_head *head = &root->fs_info->space_info; |
| 1174 | struct btrfs_space_info *found; |
| 1175 | u64 total_used = 0; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1176 | u64 total_free_data = 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1177 | int bits = dentry->d_sb->s_blocksize_bits; |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 1178 | __be32 *fsid = (__be32 *)root->fs_info->fsid; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1179 | int ret; |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1180 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1181 | /* holding chunk_muext to avoid allocating new chunks */ |
| 1182 | mutex_lock(&root->fs_info->chunk_mutex); |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 1183 | rcu_read_lock(); |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 1184 | list_for_each_entry_rcu(found, head, list) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1185 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
| 1186 | total_free_data += found->disk_total - found->disk_used; |
| 1187 | total_free_data -= |
| 1188 | btrfs_account_ro_block_groups_free_space(found); |
| 1189 | } |
| 1190 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 1191 | total_used += found->disk_used; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 1192 | } |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 1193 | rcu_read_unlock(); |
| 1194 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1195 | buf->f_namelen = BTRFS_NAME_LEN; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1196 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 1197 | buf->f_bfree = buf->f_blocks - (total_used >> bits); |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1198 | buf->f_bsize = dentry->d_sb->s_blocksize; |
| 1199 | buf->f_type = BTRFS_SUPER_MAGIC; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1200 | buf->f_bavail = total_free_data; |
| 1201 | ret = btrfs_calc_avail_data_space(root, &total_free_data); |
| 1202 | if (ret) { |
| 1203 | mutex_unlock(&root->fs_info->chunk_mutex); |
| 1204 | return ret; |
| 1205 | } |
| 1206 | buf->f_bavail += total_free_data; |
| 1207 | buf->f_bavail = buf->f_bavail >> bits; |
| 1208 | mutex_unlock(&root->fs_info->chunk_mutex); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1209 | |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 1210 | /* We treat it as constant endianness (it doesn't matter _which_) |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1211 | because we want the fsid to come out the same whether mounted |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 1212 | on a big-endian or little-endian host */ |
| 1213 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); |
| 1214 | 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] | 1215 | /* Mask in the root object ID too, to disambiguate subvols */ |
| 1216 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; |
| 1217 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; |
| 1218 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1219 | return 0; |
| 1220 | } |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 1221 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1222 | static struct file_system_type btrfs_fs_type = { |
| 1223 | .owner = THIS_MODULE, |
| 1224 | .name = "btrfs", |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 1225 | .mount = btrfs_mount, |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1226 | .kill_sb = kill_anon_super, |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1227 | .fs_flags = FS_REQUIRES_DEV, |
| 1228 | }; |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1229 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1230 | /* |
| 1231 | * used by btrfsctl to scan devices when no FS is mounted |
| 1232 | */ |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1233 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
| 1234 | unsigned long arg) |
| 1235 | { |
| 1236 | struct btrfs_ioctl_vol_args *vol; |
| 1237 | struct btrfs_fs_devices *fs_devices; |
Chris Mason | c071fcf | 2009-01-16 11:59:08 -0500 | [diff] [blame] | 1238 | int ret = -ENOTTY; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1239 | |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 1240 | if (!capable(CAP_SYS_ADMIN)) |
| 1241 | return -EPERM; |
| 1242 | |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 1243 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
| 1244 | if (IS_ERR(vol)) |
| 1245 | return PTR_ERR(vol); |
Chris Mason | c071fcf | 2009-01-16 11:59:08 -0500 | [diff] [blame] | 1246 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1247 | switch (cmd) { |
| 1248 | case BTRFS_IOC_SCAN_DEV: |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 1249 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1250 | &btrfs_fs_type, &fs_devices); |
| 1251 | break; |
| 1252 | } |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 1253 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1254 | kfree(vol); |
Linda Knippers | f819d83 | 2008-06-09 22:17:11 -0400 | [diff] [blame] | 1255 | return ret; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1256 | } |
| 1257 | |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1258 | static int btrfs_freeze(struct super_block *sb) |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1259 | { |
| 1260 | struct btrfs_root *root = btrfs_sb(sb); |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 1261 | mutex_lock(&root->fs_info->transaction_kthread_mutex); |
| 1262 | mutex_lock(&root->fs_info->cleaner_mutex); |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1263 | return 0; |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1264 | } |
| 1265 | |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1266 | static int btrfs_unfreeze(struct super_block *sb) |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1267 | { |
| 1268 | struct btrfs_root *root = btrfs_sb(sb); |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 1269 | mutex_unlock(&root->fs_info->cleaner_mutex); |
| 1270 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1271 | return 0; |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1272 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1273 | |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 1274 | static void btrfs_fs_dirty_inode(struct inode *inode, int flags) |
| 1275 | { |
| 1276 | int ret; |
| 1277 | |
| 1278 | ret = btrfs_dirty_inode(inode); |
| 1279 | if (ret) |
| 1280 | printk_ratelimited(KERN_ERR "btrfs: fail to dirty inode %Lu " |
| 1281 | "error %d\n", btrfs_ino(inode), ret); |
| 1282 | } |
| 1283 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 1284 | static const struct super_operations btrfs_super_ops = { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1285 | .drop_inode = btrfs_drop_inode, |
Al Viro | bd55597 | 2010-06-07 11:35:40 -0400 | [diff] [blame] | 1286 | .evict_inode = btrfs_evict_inode, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1287 | .put_super = btrfs_put_super, |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1288 | .sync_fs = btrfs_sync_fs, |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 1289 | .show_options = btrfs_show_options, |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 1290 | .write_inode = btrfs_write_inode, |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 1291 | .dirty_inode = btrfs_fs_dirty_inode, |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1292 | .alloc_inode = btrfs_alloc_inode, |
| 1293 | .destroy_inode = btrfs_destroy_inode, |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1294 | .statfs = btrfs_statfs, |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1295 | .remount_fs = btrfs_remount, |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1296 | .freeze_fs = btrfs_freeze, |
| 1297 | .unfreeze_fs = btrfs_unfreeze, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1298 | }; |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1299 | |
| 1300 | static const struct file_operations btrfs_ctl_fops = { |
| 1301 | .unlocked_ioctl = btrfs_control_ioctl, |
| 1302 | .compat_ioctl = btrfs_control_ioctl, |
| 1303 | .owner = THIS_MODULE, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1304 | .llseek = noop_llseek, |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1305 | }; |
| 1306 | |
| 1307 | static struct miscdevice btrfs_misc = { |
Kay Sievers | 578454f | 2010-05-20 18:07:20 +0200 | [diff] [blame] | 1308 | .minor = BTRFS_MINOR, |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1309 | .name = "btrfs-control", |
| 1310 | .fops = &btrfs_ctl_fops |
| 1311 | }; |
| 1312 | |
Kay Sievers | 578454f | 2010-05-20 18:07:20 +0200 | [diff] [blame] | 1313 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
| 1314 | MODULE_ALIAS("devname:btrfs-control"); |
| 1315 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1316 | static int btrfs_interface_init(void) |
| 1317 | { |
| 1318 | return misc_register(&btrfs_misc); |
| 1319 | } |
| 1320 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1321 | static void btrfs_interface_exit(void) |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1322 | { |
| 1323 | if (misc_deregister(&btrfs_misc) < 0) |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1324 | printk(KERN_INFO "misc_deregister failed for control device"); |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1325 | } |
| 1326 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1327 | static int __init init_btrfs_fs(void) |
| 1328 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1329 | int err; |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1330 | |
| 1331 | err = btrfs_init_sysfs(); |
| 1332 | if (err) |
| 1333 | return err; |
| 1334 | |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1335 | err = btrfs_init_compress(); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1336 | if (err) |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 1337 | goto free_sysfs; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1338 | |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1339 | err = btrfs_init_cachep(); |
| 1340 | if (err) |
| 1341 | goto free_compress; |
| 1342 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1343 | err = extent_io_init(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1344 | if (err) |
| 1345 | goto free_cachep; |
| 1346 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1347 | err = extent_map_init(); |
| 1348 | if (err) |
| 1349 | goto free_extent_io; |
| 1350 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1351 | err = btrfs_delayed_inode_init(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1352 | if (err) |
| 1353 | goto free_extent_map; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1354 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1355 | err = btrfs_interface_init(); |
| 1356 | if (err) |
| 1357 | goto free_delayed_inode; |
| 1358 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1359 | err = register_filesystem(&btrfs_fs_type); |
| 1360 | if (err) |
| 1361 | goto unregister_ioctl; |
Chris Mason | b3c3da7 | 2008-07-23 12:12:13 -0400 | [diff] [blame] | 1362 | |
| 1363 | printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1364 | return 0; |
| 1365 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1366 | unregister_ioctl: |
| 1367 | btrfs_interface_exit(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1368 | free_delayed_inode: |
| 1369 | btrfs_delayed_inode_exit(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1370 | free_extent_map: |
| 1371 | extent_map_exit(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1372 | free_extent_io: |
| 1373 | extent_io_exit(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1374 | free_cachep: |
| 1375 | btrfs_destroy_cachep(); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1376 | free_compress: |
| 1377 | btrfs_exit_compress(); |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 1378 | free_sysfs: |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1379 | btrfs_exit_sysfs(); |
| 1380 | return err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1381 | } |
| 1382 | |
| 1383 | static void __exit exit_btrfs_fs(void) |
| 1384 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1385 | btrfs_destroy_cachep(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1386 | btrfs_delayed_inode_exit(); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1387 | extent_map_exit(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1388 | extent_io_exit(); |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1389 | btrfs_interface_exit(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1390 | unregister_filesystem(&btrfs_fs_type); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1391 | btrfs_exit_sysfs(); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1392 | btrfs_cleanup_fs_uuids(); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1393 | btrfs_exit_compress(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1394 | } |
| 1395 | |
| 1396 | module_init(init_btrfs_fs) |
| 1397 | module_exit(exit_btrfs_fs) |
| 1398 | |
| 1399 | MODULE_LICENSE("GPL"); |