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> |
Filipe Brandenburger | 55e301f | 2013-01-29 06:04:50 +0000 | [diff] [blame] | 44 | #include <linux/btrfs.h> |
Chris Mason | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 45 | #include "compat.h" |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 46 | #include "delayed-inode.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 47 | #include "ctree.h" |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 48 | #include "disk-io.h" |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 49 | #include "transaction.h" |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 50 | #include "btrfs_inode.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" |
Balaji Rao | be6e8dc | 2008-07-21 02:01:56 +0530 | [diff] [blame] | 54 | #include "export.h" |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 55 | #include "compression.h" |
Josef Bacik | 9c5085c | 2012-06-05 14:13:12 -0400 | [diff] [blame] | 56 | #include "rcu-string.h" |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 57 | #include "dev-replace.h" |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 58 | #include "free-space-cache.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 59 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 60 | #define CREATE_TRACE_POINTS |
| 61 | #include <trace/events/btrfs.h> |
| 62 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 63 | static const struct super_operations btrfs_super_ops; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 64 | static struct file_system_type btrfs_fs_type; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 65 | |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 66 | static const char *btrfs_decode_error(int errno) |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 67 | { |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 68 | char *errstr = "unknown"; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 69 | |
| 70 | switch (errno) { |
| 71 | case -EIO: |
| 72 | errstr = "IO failure"; |
| 73 | break; |
| 74 | case -ENOMEM: |
| 75 | errstr = "Out of memory"; |
| 76 | break; |
| 77 | case -EROFS: |
| 78 | errstr = "Readonly filesystem"; |
| 79 | break; |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 80 | case -EEXIST: |
| 81 | errstr = "Object already exists"; |
| 82 | break; |
David Sterba | 94ef728 | 2013-03-20 14:29:47 +0000 | [diff] [blame] | 83 | case -ENOSPC: |
| 84 | errstr = "No space left"; |
| 85 | break; |
| 86 | case -ENOENT: |
| 87 | errstr = "No such entry"; |
| 88 | break; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 89 | } |
| 90 | |
| 91 | return errstr; |
| 92 | } |
| 93 | |
David Sterba | bbece8a | 2013-03-11 17:07:45 +0000 | [diff] [blame] | 94 | static void save_error_info(struct btrfs_fs_info *fs_info) |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 95 | { |
| 96 | /* |
| 97 | * today we only save the error info into ram. Long term we'll |
| 98 | * also send it down to the disk |
| 99 | */ |
Miao Xie | 87533c4 | 2013-01-29 10:14:48 +0000 | [diff] [blame] | 100 | set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 101 | } |
| 102 | |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 103 | /* btrfs handle error by forcing the filesystem readonly */ |
| 104 | static void btrfs_handle_error(struct btrfs_fs_info *fs_info) |
| 105 | { |
| 106 | struct super_block *sb = fs_info->sb; |
| 107 | |
| 108 | if (sb->s_flags & MS_RDONLY) |
| 109 | return; |
| 110 | |
Miao Xie | 87533c4 | 2013-01-29 10:14:48 +0000 | [diff] [blame] | 111 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 112 | sb->s_flags |= MS_RDONLY; |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 113 | btrfs_info(fs_info, "forced readonly"); |
Stefan Behrens | 1acd683 | 2012-11-05 17:11:06 +0100 | [diff] [blame] | 114 | /* |
| 115 | * Note that a running device replace operation is not |
| 116 | * canceled here although there is no way to update |
| 117 | * the progress. It would add the risk of a deadlock, |
| 118 | * therefore the canceling is ommited. The only penalty |
| 119 | * is that some I/O remains active until the procedure |
| 120 | * completes. The next time when the filesystem is |
| 121 | * mounted writeable again, the device replace |
| 122 | * operation continues. |
| 123 | */ |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 124 | } |
| 125 | } |
| 126 | |
Joe Perches | 533574c | 2012-07-30 14:40:13 -0700 | [diff] [blame] | 127 | #ifdef CONFIG_PRINTK |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 128 | /* |
| 129 | * __btrfs_std_error decodes expected errors from the caller and |
| 130 | * invokes the approciate error response. |
| 131 | */ |
| 132 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 133 | unsigned int line, int errno, const char *fmt, ...) |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 134 | { |
| 135 | struct super_block *sb = fs_info->sb; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 136 | const char *errstr; |
| 137 | |
| 138 | /* |
| 139 | * Special case: if the error is EROFS, and we're already |
| 140 | * under MS_RDONLY, then it is safe here. |
| 141 | */ |
| 142 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 143 | return; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 144 | |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 145 | errstr = btrfs_decode_error(errno); |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 146 | if (fmt) { |
Eric Sandeen | 37252a6 | 2013-01-31 00:54:58 +0000 | [diff] [blame] | 147 | struct va_format vaf; |
| 148 | va_list args; |
| 149 | |
| 150 | va_start(args, fmt); |
| 151 | vaf.fmt = fmt; |
| 152 | vaf.va = &args; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 153 | |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 154 | printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: errno=%d %s (%pV)\n", |
| 155 | sb->s_id, function, line, errno, errstr, &vaf); |
Eric Sandeen | 37252a6 | 2013-01-31 00:54:58 +0000 | [diff] [blame] | 156 | va_end(args); |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 157 | } else { |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 158 | printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: errno=%d %s\n", |
| 159 | sb->s_id, function, line, errno, errstr); |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 160 | } |
| 161 | |
| 162 | /* Don't go through full error handling during mount */ |
Josef Bacik | cf79ffb | 2013-04-01 11:23:58 -0400 | [diff] [blame] | 163 | save_error_info(fs_info); |
| 164 | if (sb->s_flags & MS_BORN) |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 165 | btrfs_handle_error(fs_info); |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 166 | } |
| 167 | |
Joe Perches | 533574c | 2012-07-30 14:40:13 -0700 | [diff] [blame] | 168 | static const char * const logtypes[] = { |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 169 | "emergency", |
| 170 | "alert", |
| 171 | "critical", |
| 172 | "error", |
| 173 | "warning", |
| 174 | "notice", |
| 175 | "info", |
| 176 | "debug", |
| 177 | }; |
| 178 | |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 179 | void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 180 | { |
| 181 | struct super_block *sb = fs_info->sb; |
| 182 | char lvl[4]; |
| 183 | struct va_format vaf; |
| 184 | va_list args; |
| 185 | const char *type = logtypes[4]; |
Joe Perches | 533574c | 2012-07-30 14:40:13 -0700 | [diff] [blame] | 186 | int kern_level; |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 187 | |
| 188 | va_start(args, fmt); |
| 189 | |
Joe Perches | 533574c | 2012-07-30 14:40:13 -0700 | [diff] [blame] | 190 | kern_level = printk_get_level(fmt); |
| 191 | if (kern_level) { |
| 192 | size_t size = printk_skip_level(fmt) - fmt; |
| 193 | memcpy(lvl, fmt, size); |
| 194 | lvl[size] = '\0'; |
| 195 | fmt += size; |
| 196 | type = logtypes[kern_level - '0']; |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 197 | } else |
| 198 | *lvl = '\0'; |
| 199 | |
| 200 | vaf.fmt = fmt; |
| 201 | vaf.va = &args; |
Joe Perches | 533574c | 2012-07-30 14:40:13 -0700 | [diff] [blame] | 202 | |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 203 | printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf); |
Joe Perches | 533574c | 2012-07-30 14:40:13 -0700 | [diff] [blame] | 204 | |
| 205 | va_end(args); |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 206 | } |
| 207 | |
Joe Perches | 533574c | 2012-07-30 14:40:13 -0700 | [diff] [blame] | 208 | #else |
| 209 | |
| 210 | void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, |
| 211 | unsigned int line, int errno, const char *fmt, ...) |
| 212 | { |
| 213 | struct super_block *sb = fs_info->sb; |
| 214 | |
| 215 | /* |
| 216 | * Special case: if the error is EROFS, and we're already |
| 217 | * under MS_RDONLY, then it is safe here. |
| 218 | */ |
| 219 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) |
| 220 | return; |
| 221 | |
| 222 | /* Don't go through full error handling during mount */ |
| 223 | if (sb->s_flags & MS_BORN) { |
| 224 | save_error_info(fs_info); |
| 225 | btrfs_handle_error(fs_info); |
| 226 | } |
| 227 | } |
| 228 | #endif |
| 229 | |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 230 | /* |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 231 | * We only mark the transaction aborted and then set the file system read-only. |
| 232 | * This will prevent new transactions from starting or trying to join this |
| 233 | * one. |
| 234 | * |
| 235 | * This means that error recovery at the call site is limited to freeing |
| 236 | * any local memory allocations and passing the error code up without |
| 237 | * further cleanup. The transaction should complete as it normally would |
| 238 | * in the call path but will return -EIO. |
| 239 | * |
| 240 | * We'll complete the cleanup in btrfs_end_transaction and |
| 241 | * btrfs_commit_transaction. |
| 242 | */ |
| 243 | void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, |
| 244 | struct btrfs_root *root, const char *function, |
| 245 | unsigned int line, int errno) |
| 246 | { |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 247 | /* |
| 248 | * Report first abort since mount |
| 249 | */ |
| 250 | if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, |
| 251 | &root->fs_info->fs_state)) { |
| 252 | WARN(1, KERN_DEBUG "btrfs: Transaction aborted (error %d)\n", |
| 253 | errno); |
| 254 | } |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 255 | trans->aborted = errno; |
| 256 | /* Nothing used. The other threads that have joined this |
| 257 | * transaction may be able to continue. */ |
| 258 | if (!trans->blocks_used) { |
Miao Xie | 69ce977 | 2012-09-06 04:04:44 -0600 | [diff] [blame] | 259 | const char *errstr; |
| 260 | |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 261 | errstr = btrfs_decode_error(errno); |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 262 | btrfs_warn(root->fs_info, |
| 263 | "%s:%d: Aborting unused transaction(%s).", |
| 264 | function, line, errstr); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 265 | return; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 266 | } |
Miao Xie | 8d25a08 | 2013-01-15 06:27:25 +0000 | [diff] [blame] | 267 | ACCESS_ONCE(trans->transaction->aborted) = errno; |
Josef Bacik | 501407a | 2013-06-10 16:47:23 -0400 | [diff] [blame] | 268 | /* Wake up anybody who may be waiting on this transaction */ |
| 269 | wake_up(&root->fs_info->transaction_wait); |
| 270 | wake_up(&root->fs_info->transaction_blocked_wait); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 271 | __btrfs_std_error(root->fs_info, function, line, errno, NULL); |
| 272 | } |
| 273 | /* |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 274 | * __btrfs_panic decodes unexpected, fatal errors from the caller, |
| 275 | * issues an alert, and either panics or BUGs, depending on mount options. |
| 276 | */ |
| 277 | void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, |
| 278 | unsigned int line, int errno, const char *fmt, ...) |
| 279 | { |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 280 | char *s_id = "<unknown>"; |
| 281 | const char *errstr; |
| 282 | struct va_format vaf = { .fmt = fmt }; |
| 283 | va_list args; |
| 284 | |
| 285 | if (fs_info) |
| 286 | s_id = fs_info->sb->s_id; |
| 287 | |
| 288 | va_start(args, fmt); |
| 289 | vaf.va = &args; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 290 | |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 291 | errstr = btrfs_decode_error(errno); |
Eric Sandeen | aa43a17 | 2013-01-31 00:54:55 +0000 | [diff] [blame] | 292 | if (fs_info && (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)) |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 293 | panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", |
| 294 | s_id, function, line, &vaf, errno, errstr); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 295 | |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 296 | printk(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", |
| 297 | s_id, function, line, &vaf, errno, errstr); |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 298 | va_end(args); |
| 299 | /* Caller calls BUG() */ |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 300 | } |
| 301 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 302 | static void btrfs_put_super(struct super_block *sb) |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 303 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 304 | (void)close_ctree(btrfs_sb(sb)->tree_root); |
Al Viro | aea52e1 | 2011-11-17 01:22:46 -0500 | [diff] [blame] | 305 | /* FIXME: need to fix VFS to return error? */ |
| 306 | /* AV: return it _where_? ->put_super() can be triggered by any number |
| 307 | * of async events, up to and including delivery of SIGKILL to the |
| 308 | * last process that kept it busy. Or segfault in the aforementioned |
| 309 | * process... Whom would you report that to? |
| 310 | */ |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 311 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 312 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 313 | enum { |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 314 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
Josef Bacik | 287a0ab | 2010-03-19 18:07:23 +0000 | [diff] [blame] | 315 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
| 316 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 317 | Opt_compress_type, Opt_compress_force, Opt_compress_force_type, |
| 318 | Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, |
Chris Mason | 9143565 | 2011-02-16 13:10:41 -0500 | [diff] [blame] | 319 | Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, |
Ilya Dryomov | 9555c6c | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 320 | Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache, |
| 321 | Opt_no_space_cache, Opt_recovery, Opt_skip_balance, |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 322 | Opt_check_integrity, Opt_check_integrity_including_extent_data, |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 323 | Opt_check_integrity_print_mask, Opt_fatal_errors, |
Ilya Dryomov | 9555c6c | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 324 | Opt_err, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 325 | }; |
| 326 | |
| 327 | static match_table_t tokens = { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 328 | {Opt_degraded, "degraded"}, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 329 | {Opt_subvol, "subvol=%s"}, |
Wang Shilong | 1493381 | 2013-07-24 10:29:20 +0800 | [diff] [blame^] | 330 | {Opt_subvolid, "subvolid=%s"}, |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 331 | {Opt_device, "device=%s"}, |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 332 | {Opt_nodatasum, "nodatasum"}, |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 333 | {Opt_nodatacow, "nodatacow"}, |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 334 | {Opt_nobarrier, "nobarrier"}, |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 335 | {Opt_max_inline, "max_inline=%s"}, |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 336 | {Opt_alloc_start, "alloc_start=%s"}, |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 337 | {Opt_thread_pool, "thread_pool=%d"}, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 338 | {Opt_compress, "compress"}, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 339 | {Opt_compress_type, "compress=%s"}, |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 340 | {Opt_compress_force, "compress-force"}, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 341 | {Opt_compress_force_type, "compress-force=%s"}, |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 342 | {Opt_ssd, "ssd"}, |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 343 | {Opt_ssd_spread, "ssd_spread"}, |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 344 | {Opt_nossd, "nossd"}, |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 345 | {Opt_noacl, "noacl"}, |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 346 | {Opt_notreelog, "notreelog"}, |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 347 | {Opt_flushoncommit, "flushoncommit"}, |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 348 | {Opt_ratio, "metadata_ratio=%d"}, |
Christoph Hellwig | e244a0a | 2009-10-14 09:24:59 -0400 | [diff] [blame] | 349 | {Opt_discard, "discard"}, |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 350 | {Opt_space_cache, "space_cache"}, |
Josef Bacik | 88c2ba3 | 2010-09-21 14:21:34 -0400 | [diff] [blame] | 351 | {Opt_clear_cache, "clear_cache"}, |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 352 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
Chris Mason | 9143565 | 2011-02-16 13:10:41 -0500 | [diff] [blame] | 353 | {Opt_enospc_debug, "enospc_debug"}, |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 354 | {Opt_subvolrootid, "subvolrootid=%d"}, |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 355 | {Opt_defrag, "autodefrag"}, |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 356 | {Opt_inode_cache, "inode_cache"}, |
David Sterba | 8965593 | 2011-11-11 10:14:57 -0500 | [diff] [blame] | 357 | {Opt_no_space_cache, "nospace_cache"}, |
Chris Mason | af31f5e | 2011-11-03 15:17:42 -0400 | [diff] [blame] | 358 | {Opt_recovery, "recovery"}, |
Ilya Dryomov | 9555c6c | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 359 | {Opt_skip_balance, "skip_balance"}, |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 360 | {Opt_check_integrity, "check_int"}, |
| 361 | {Opt_check_integrity_including_extent_data, "check_int_data"}, |
| 362 | {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 363 | {Opt_fatal_errors, "fatal_errors=%s"}, |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 364 | {Opt_err, NULL}, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 365 | }; |
| 366 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 367 | /* |
| 368 | * Regular mount options parser. Everything that is needed only when |
| 369 | * reading in a new superblock is parsed here. |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 370 | * XXX JDM: This needs to be cleaned up for remount. |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 371 | */ |
| 372 | int btrfs_parse_options(struct btrfs_root *root, char *options) |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 373 | { |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 374 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 375 | substring_t args[MAX_OPT_ARGS]; |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 376 | char *p, *num, *orig = NULL; |
| 377 | u64 cache_gen; |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 378 | int intarg; |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 379 | int ret = 0; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 380 | char *compress_type; |
| 381 | bool compress_force = false; |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 382 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 383 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 384 | if (cache_gen) |
| 385 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
| 386 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 387 | if (!options) |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 388 | goto out; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 389 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 390 | /* |
| 391 | * strsep changes the string, duplicate it because parse_options |
| 392 | * gets called twice |
| 393 | */ |
| 394 | options = kstrdup(options, GFP_NOFS); |
| 395 | if (!options) |
| 396 | return -ENOMEM; |
| 397 | |
Josef Bacik | da495ec | 2010-02-25 20:38:35 +0000 | [diff] [blame] | 398 | orig = options; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 399 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 400 | while ((p = strsep(&options, ",")) != NULL) { |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 401 | int token; |
| 402 | if (!*p) |
| 403 | continue; |
| 404 | |
| 405 | token = match_token(p, tokens, args); |
| 406 | switch (token) { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 407 | case Opt_degraded: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 408 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
| 409 | btrfs_set_opt(info->mount_opt, DEGRADED); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 410 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 411 | case Opt_subvol: |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 412 | case Opt_subvolid: |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 413 | case Opt_subvolrootid: |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 414 | case Opt_device: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 415 | /* |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 416 | * These are parsed by btrfs_parse_early_options |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 417 | * and can be happily ignored here. |
| 418 | */ |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 419 | break; |
| 420 | case Opt_nodatasum: |
Chris Mason | 067c28a | 2009-06-11 09:30:13 -0400 | [diff] [blame] | 421 | printk(KERN_INFO "btrfs: setting nodatasum\n"); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 422 | btrfs_set_opt(info->mount_opt, NODATASUM); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 423 | break; |
| 424 | case Opt_nodatacow: |
Andrei Popa | bedb2cc | 2012-09-20 08:42:11 -0600 | [diff] [blame] | 425 | if (!btrfs_test_opt(root, COMPRESS) || |
| 426 | !btrfs_test_opt(root, FORCE_COMPRESS)) { |
| 427 | printk(KERN_INFO "btrfs: setting nodatacow, compression disabled\n"); |
| 428 | } else { |
| 429 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
| 430 | } |
| 431 | info->compress_type = BTRFS_COMPRESS_NONE; |
| 432 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
| 433 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 434 | btrfs_set_opt(info->mount_opt, NODATACOW); |
| 435 | btrfs_set_opt(info->mount_opt, NODATASUM); |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 436 | break; |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 437 | case Opt_compress_force: |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 438 | case Opt_compress_force_type: |
| 439 | compress_force = true; |
Eric Sandeen | 1c697d4 | 2013-01-31 00:54:56 +0000 | [diff] [blame] | 440 | /* Fallthrough */ |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 441 | case Opt_compress: |
| 442 | case Opt_compress_type: |
| 443 | if (token == Opt_compress || |
| 444 | token == Opt_compress_force || |
| 445 | strcmp(args[0].from, "zlib") == 0) { |
| 446 | compress_type = "zlib"; |
| 447 | info->compress_type = BTRFS_COMPRESS_ZLIB; |
Arnd Hannemann | 063849e | 2012-04-16 15:27:51 +0200 | [diff] [blame] | 448 | btrfs_set_opt(info->mount_opt, COMPRESS); |
Andrei Popa | bedb2cc | 2012-09-20 08:42:11 -0600 | [diff] [blame] | 449 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
| 450 | btrfs_clear_opt(info->mount_opt, NODATASUM); |
Li Zefan | a6fa6fa | 2010-10-25 15:12:26 +0800 | [diff] [blame] | 451 | } else if (strcmp(args[0].from, "lzo") == 0) { |
| 452 | compress_type = "lzo"; |
| 453 | info->compress_type = BTRFS_COMPRESS_LZO; |
Arnd Hannemann | 063849e | 2012-04-16 15:27:51 +0200 | [diff] [blame] | 454 | btrfs_set_opt(info->mount_opt, COMPRESS); |
Andrei Popa | bedb2cc | 2012-09-20 08:42:11 -0600 | [diff] [blame] | 455 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
| 456 | btrfs_clear_opt(info->mount_opt, NODATASUM); |
Mitch Harder | 2b0ce2c | 2012-07-24 11:58:43 -0600 | [diff] [blame] | 457 | btrfs_set_fs_incompat(info, COMPRESS_LZO); |
Arnd Hannemann | 063849e | 2012-04-16 15:27:51 +0200 | [diff] [blame] | 458 | } else if (strncmp(args[0].from, "no", 2) == 0) { |
| 459 | compress_type = "no"; |
| 460 | info->compress_type = BTRFS_COMPRESS_NONE; |
| 461 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
| 462 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); |
| 463 | compress_force = false; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 464 | } else { |
| 465 | ret = -EINVAL; |
| 466 | goto out; |
| 467 | } |
| 468 | |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 469 | if (compress_force) { |
| 470 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); |
| 471 | pr_info("btrfs: force %s compression\n", |
| 472 | compress_type); |
| 473 | } else |
| 474 | pr_info("btrfs: use %s compression\n", |
| 475 | compress_type); |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 476 | break; |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 477 | case Opt_ssd: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 478 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
| 479 | btrfs_set_opt(info->mount_opt, SSD); |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 480 | break; |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 481 | case Opt_ssd_spread: |
| 482 | printk(KERN_INFO "btrfs: use spread ssd " |
| 483 | "allocation scheme\n"); |
| 484 | btrfs_set_opt(info->mount_opt, SSD); |
| 485 | btrfs_set_opt(info->mount_opt, SSD_SPREAD); |
| 486 | break; |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 487 | case Opt_nossd: |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 488 | printk(KERN_INFO "btrfs: not using ssd allocation " |
| 489 | "scheme\n"); |
Chris Mason | c289811 | 2009-06-10 09:51:32 -0400 | [diff] [blame] | 490 | btrfs_set_opt(info->mount_opt, NOSSD); |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 491 | btrfs_clear_opt(info->mount_opt, SSD); |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 492 | btrfs_clear_opt(info->mount_opt, SSD_SPREAD); |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 493 | break; |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 494 | case Opt_nobarrier: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 495 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
| 496 | btrfs_set_opt(info->mount_opt, NOBARRIER); |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 497 | break; |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 498 | case Opt_thread_pool: |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 499 | ret = match_int(&args[0], &intarg); |
| 500 | if (ret) { |
| 501 | goto out; |
| 502 | } else if (intarg > 0) { |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 503 | info->thread_pool_size = intarg; |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 504 | } else { |
| 505 | ret = -EINVAL; |
| 506 | goto out; |
| 507 | } |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 508 | break; |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 509 | case Opt_max_inline: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 510 | num = match_strdup(&args[0]); |
| 511 | if (num) { |
Akinobu Mita | 9174846 | 2010-02-28 10:59:11 +0000 | [diff] [blame] | 512 | info->max_inline = memparse(num, NULL); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 513 | kfree(num); |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 514 | |
Chris Mason | 15ada04 | 2008-06-11 16:51:38 -0400 | [diff] [blame] | 515 | if (info->max_inline) { |
| 516 | info->max_inline = max_t(u64, |
| 517 | info->max_inline, |
| 518 | root->sectorsize); |
| 519 | } |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 520 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 521 | (unsigned long long)info->max_inline); |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 522 | } else { |
| 523 | ret = -ENOMEM; |
| 524 | goto out; |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 525 | } |
| 526 | break; |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 527 | case Opt_alloc_start: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 528 | num = match_strdup(&args[0]); |
| 529 | if (num) { |
Miao Xie | c018dae | 2013-01-29 10:07:33 +0000 | [diff] [blame] | 530 | mutex_lock(&info->chunk_mutex); |
Akinobu Mita | 9174846 | 2010-02-28 10:59:11 +0000 | [diff] [blame] | 531 | info->alloc_start = memparse(num, NULL); |
Miao Xie | c018dae | 2013-01-29 10:07:33 +0000 | [diff] [blame] | 532 | mutex_unlock(&info->chunk_mutex); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 533 | kfree(num); |
| 534 | printk(KERN_INFO |
| 535 | "btrfs: allocations start at %llu\n", |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 536 | (unsigned long long)info->alloc_start); |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 537 | } else { |
| 538 | ret = -ENOMEM; |
| 539 | goto out; |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 540 | } |
| 541 | break; |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 542 | case Opt_noacl: |
| 543 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; |
| 544 | break; |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 545 | case Opt_notreelog: |
| 546 | printk(KERN_INFO "btrfs: disabling tree log\n"); |
| 547 | btrfs_set_opt(info->mount_opt, NOTREELOG); |
| 548 | break; |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 549 | case Opt_flushoncommit: |
| 550 | printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); |
| 551 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); |
| 552 | break; |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 553 | case Opt_ratio: |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 554 | ret = match_int(&args[0], &intarg); |
| 555 | if (ret) { |
| 556 | goto out; |
| 557 | } else if (intarg >= 0) { |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 558 | info->metadata_ratio = intarg; |
| 559 | printk(KERN_INFO "btrfs: metadata ratio %d\n", |
| 560 | info->metadata_ratio); |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 561 | } else { |
| 562 | ret = -EINVAL; |
| 563 | goto out; |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 564 | } |
| 565 | break; |
Christoph Hellwig | e244a0a | 2009-10-14 09:24:59 -0400 | [diff] [blame] | 566 | case Opt_discard: |
| 567 | btrfs_set_opt(info->mount_opt, DISCARD); |
| 568 | break; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 569 | case Opt_space_cache: |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 570 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
Josef Bacik | 0de9087 | 2010-11-19 13:40:41 +0000 | [diff] [blame] | 571 | break; |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 572 | case Opt_no_space_cache: |
| 573 | printk(KERN_INFO "btrfs: disabling disk space caching\n"); |
| 574 | btrfs_clear_opt(info->mount_opt, SPACE_CACHE); |
| 575 | break; |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 576 | case Opt_inode_cache: |
| 577 | printk(KERN_INFO "btrfs: enabling inode map caching\n"); |
| 578 | btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE); |
| 579 | break; |
Josef Bacik | 88c2ba3 | 2010-09-21 14:21:34 -0400 | [diff] [blame] | 580 | case Opt_clear_cache: |
| 581 | printk(KERN_INFO "btrfs: force clearing of disk cache\n"); |
| 582 | btrfs_set_opt(info->mount_opt, CLEAR_CACHE); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 583 | break; |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 584 | case Opt_user_subvol_rm_allowed: |
| 585 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); |
| 586 | break; |
Chris Mason | 9143565 | 2011-02-16 13:10:41 -0500 | [diff] [blame] | 587 | case Opt_enospc_debug: |
| 588 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); |
| 589 | break; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 590 | case Opt_defrag: |
Daniel J Blueman | 4894066 | 2012-05-07 06:35:38 -0600 | [diff] [blame] | 591 | printk(KERN_INFO "btrfs: enabling auto defrag\n"); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 592 | btrfs_set_opt(info->mount_opt, AUTO_DEFRAG); |
| 593 | break; |
Chris Mason | af31f5e | 2011-11-03 15:17:42 -0400 | [diff] [blame] | 594 | case Opt_recovery: |
Daniel J Blueman | 4894066 | 2012-05-07 06:35:38 -0600 | [diff] [blame] | 595 | printk(KERN_INFO "btrfs: enabling auto recovery\n"); |
Chris Mason | af31f5e | 2011-11-03 15:17:42 -0400 | [diff] [blame] | 596 | btrfs_set_opt(info->mount_opt, RECOVERY); |
| 597 | break; |
Ilya Dryomov | 9555c6c | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 598 | case Opt_skip_balance: |
| 599 | btrfs_set_opt(info->mount_opt, SKIP_BALANCE); |
| 600 | break; |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 601 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
| 602 | case Opt_check_integrity_including_extent_data: |
| 603 | printk(KERN_INFO "btrfs: enabling check integrity" |
| 604 | " including extent data\n"); |
| 605 | btrfs_set_opt(info->mount_opt, |
| 606 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); |
| 607 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
| 608 | break; |
| 609 | case Opt_check_integrity: |
| 610 | printk(KERN_INFO "btrfs: enabling check integrity\n"); |
| 611 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
| 612 | break; |
| 613 | case Opt_check_integrity_print_mask: |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 614 | ret = match_int(&args[0], &intarg); |
| 615 | if (ret) { |
| 616 | goto out; |
| 617 | } else if (intarg >= 0) { |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 618 | info->check_integrity_print_mask = intarg; |
| 619 | printk(KERN_INFO "btrfs:" |
| 620 | " check_integrity_print_mask 0x%x\n", |
| 621 | info->check_integrity_print_mask); |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 622 | } else { |
| 623 | ret = -EINVAL; |
| 624 | goto out; |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 625 | } |
| 626 | break; |
| 627 | #else |
| 628 | case Opt_check_integrity_including_extent_data: |
| 629 | case Opt_check_integrity: |
| 630 | case Opt_check_integrity_print_mask: |
| 631 | printk(KERN_ERR "btrfs: support for check_integrity*" |
| 632 | " not compiled in!\n"); |
| 633 | ret = -EINVAL; |
| 634 | goto out; |
| 635 | #endif |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 636 | case Opt_fatal_errors: |
| 637 | if (strcmp(args[0].from, "panic") == 0) |
| 638 | btrfs_set_opt(info->mount_opt, |
| 639 | PANIC_ON_FATAL_ERROR); |
| 640 | else if (strcmp(args[0].from, "bug") == 0) |
| 641 | btrfs_clear_opt(info->mount_opt, |
| 642 | PANIC_ON_FATAL_ERROR); |
| 643 | else { |
| 644 | ret = -EINVAL; |
| 645 | goto out; |
| 646 | } |
| 647 | break; |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 648 | case Opt_err: |
| 649 | printk(KERN_INFO "btrfs: unrecognized mount option " |
| 650 | "'%s'\n", p); |
| 651 | ret = -EINVAL; |
| 652 | goto out; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 653 | default: |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 654 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 655 | } |
| 656 | } |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 657 | out: |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 658 | if (!ret && btrfs_test_opt(root, SPACE_CACHE)) |
| 659 | printk(KERN_INFO "btrfs: disk space caching is enabled\n"); |
Josef Bacik | da495ec | 2010-02-25 20:38:35 +0000 | [diff] [blame] | 660 | kfree(orig); |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 661 | return ret; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 662 | } |
| 663 | |
| 664 | /* |
| 665 | * Parse mount options that are required early in the mount process. |
| 666 | * |
| 667 | * All other options will be parsed on much later in the mount process and |
| 668 | * only when we need to allocate a new super block. |
| 669 | */ |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 670 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 671 | void *holder, char **subvol_name, u64 *subvol_objectid, |
David Sterba | 5e2a4b2 | 2013-03-20 13:21:10 +0000 | [diff] [blame] | 672 | struct btrfs_fs_devices **fs_devices) |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 673 | { |
| 674 | substring_t args[MAX_OPT_ARGS]; |
Jeff Liu | 83c8c9b | 2011-09-14 14:11:21 +0800 | [diff] [blame] | 675 | char *device_name, *opts, *orig, *p; |
Wang Shilong | 1493381 | 2013-07-24 10:29:20 +0800 | [diff] [blame^] | 676 | char *num = NULL; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 677 | int error = 0; |
| 678 | |
| 679 | if (!options) |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 680 | return 0; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 681 | |
| 682 | /* |
| 683 | * strsep changes the string, duplicate it because parse_options |
| 684 | * gets called twice |
| 685 | */ |
| 686 | opts = kstrdup(options, GFP_KERNEL); |
| 687 | if (!opts) |
| 688 | return -ENOMEM; |
Tero Roponen | 3f3d0bc | 2010-12-27 16:43:13 +0800 | [diff] [blame] | 689 | orig = opts; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 690 | |
| 691 | while ((p = strsep(&opts, ",")) != NULL) { |
| 692 | int token; |
| 693 | if (!*p) |
| 694 | continue; |
| 695 | |
| 696 | token = match_token(p, tokens, args); |
| 697 | switch (token) { |
| 698 | case Opt_subvol: |
Ilya Dryomov | a90e8b6 | 2011-11-08 16:47:55 +0200 | [diff] [blame] | 699 | kfree(*subvol_name); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 700 | *subvol_name = match_strdup(&args[0]); |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 701 | if (!*subvol_name) { |
| 702 | error = -ENOMEM; |
| 703 | goto out; |
| 704 | } |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 705 | break; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 706 | case Opt_subvolid: |
Wang Shilong | 1493381 | 2013-07-24 10:29:20 +0800 | [diff] [blame^] | 707 | num = match_strdup(&args[0]); |
| 708 | if (num) { |
| 709 | *subvol_objectid = memparse(num, NULL); |
| 710 | kfree(num); |
Josef Bacik | 4849f01d | 2009-12-14 19:18:38 +0000 | [diff] [blame] | 711 | /* we want the original fs_tree */ |
Wang Shilong | 1493381 | 2013-07-24 10:29:20 +0800 | [diff] [blame^] | 712 | if (!*subvol_objectid) |
Josef Bacik | 4849f01d | 2009-12-14 19:18:38 +0000 | [diff] [blame] | 713 | *subvol_objectid = |
| 714 | BTRFS_FS_TREE_OBJECTID; |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 715 | } else { |
| 716 | error = -EINVAL; |
| 717 | goto out; |
Josef Bacik | 4849f01d | 2009-12-14 19:18:38 +0000 | [diff] [blame] | 718 | } |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 719 | break; |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 720 | case Opt_subvolrootid: |
David Sterba | 5e2a4b2 | 2013-03-20 13:21:10 +0000 | [diff] [blame] | 721 | printk(KERN_WARNING |
| 722 | "btrfs: 'subvolrootid' mount option is deprecated and has no effect\n"); |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 723 | break; |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 724 | case Opt_device: |
Jeff Liu | 83c8c9b | 2011-09-14 14:11:21 +0800 | [diff] [blame] | 725 | device_name = match_strdup(&args[0]); |
| 726 | if (!device_name) { |
| 727 | error = -ENOMEM; |
| 728 | goto out; |
| 729 | } |
| 730 | error = btrfs_scan_one_device(device_name, |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 731 | flags, holder, fs_devices); |
Jeff Liu | 83c8c9b | 2011-09-14 14:11:21 +0800 | [diff] [blame] | 732 | kfree(device_name); |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 733 | if (error) |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 734 | goto out; |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 735 | break; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 736 | default: |
| 737 | break; |
| 738 | } |
| 739 | } |
| 740 | |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 741 | out: |
Tero Roponen | 3f3d0bc | 2010-12-27 16:43:13 +0800 | [diff] [blame] | 742 | kfree(orig); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 743 | return error; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 744 | } |
| 745 | |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 746 | static struct dentry *get_default_root(struct super_block *sb, |
| 747 | u64 subvol_objectid) |
| 748 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 749 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
| 750 | struct btrfs_root *root = fs_info->tree_root; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 751 | struct btrfs_root *new_root; |
| 752 | struct btrfs_dir_item *di; |
| 753 | struct btrfs_path *path; |
| 754 | struct btrfs_key location; |
| 755 | struct inode *inode; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 756 | u64 dir_id; |
| 757 | int new = 0; |
| 758 | |
| 759 | /* |
| 760 | * We have a specific subvol we want to mount, just setup location and |
| 761 | * go look up the root. |
| 762 | */ |
| 763 | if (subvol_objectid) { |
| 764 | location.objectid = subvol_objectid; |
| 765 | location.type = BTRFS_ROOT_ITEM_KEY; |
| 766 | location.offset = (u64)-1; |
| 767 | goto find_root; |
| 768 | } |
| 769 | |
| 770 | path = btrfs_alloc_path(); |
| 771 | if (!path) |
| 772 | return ERR_PTR(-ENOMEM); |
| 773 | path->leave_spinning = 1; |
| 774 | |
| 775 | /* |
| 776 | * Find the "default" dir item which points to the root item that we |
| 777 | * will mount by default if we haven't been given a specific subvolume |
| 778 | * to mount. |
| 779 | */ |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 780 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 781 | 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] | 782 | if (IS_ERR(di)) { |
| 783 | btrfs_free_path(path); |
Dan Carpenter | fb4f6f9 | 2010-05-29 09:40:57 +0000 | [diff] [blame] | 784 | return ERR_CAST(di); |
Julia Lawall | b083916 | 2011-05-14 07:10:51 +0000 | [diff] [blame] | 785 | } |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 786 | if (!di) { |
| 787 | /* |
| 788 | * Ok the default dir item isn't there. This is weird since |
| 789 | * it's always been there, but don't freak out, just try and |
| 790 | * mount to root most subvolume. |
| 791 | */ |
| 792 | btrfs_free_path(path); |
| 793 | dir_id = BTRFS_FIRST_FREE_OBJECTID; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 794 | new_root = fs_info->fs_root; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 795 | goto setup_root; |
| 796 | } |
| 797 | |
| 798 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); |
| 799 | btrfs_free_path(path); |
| 800 | |
| 801 | find_root: |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 802 | new_root = btrfs_read_fs_root_no_name(fs_info, &location); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 803 | if (IS_ERR(new_root)) |
Julia Lawall | d0b678c | 2010-10-29 15:14:23 -0400 | [diff] [blame] | 804 | return ERR_CAST(new_root); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 805 | |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 806 | dir_id = btrfs_root_dirid(&new_root->root_item); |
| 807 | setup_root: |
| 808 | location.objectid = dir_id; |
| 809 | location.type = BTRFS_INODE_ITEM_KEY; |
| 810 | location.offset = 0; |
| 811 | |
| 812 | inode = btrfs_iget(sb, &location, new_root, &new); |
Dan Carpenter | 4cbd114 | 2010-05-29 09:42:19 +0000 | [diff] [blame] | 813 | if (IS_ERR(inode)) |
| 814 | return ERR_CAST(inode); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 815 | |
| 816 | /* |
| 817 | * If we're just mounting the root most subvol put the inode and return |
| 818 | * a reference to the dentry. We will have already gotten a reference |
| 819 | * to the inode in btrfs_fill_super so we're good to go. |
| 820 | */ |
| 821 | if (!new && sb->s_root->d_inode == inode) { |
| 822 | iput(inode); |
| 823 | return dget(sb->s_root); |
| 824 | } |
| 825 | |
Josef Bacik | ba5b895 | 2011-07-25 15:40:35 -0400 | [diff] [blame] | 826 | return d_obtain_alias(inode); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 827 | } |
| 828 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 829 | static int btrfs_fill_super(struct super_block *sb, |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 830 | struct btrfs_fs_devices *fs_devices, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 831 | void *data, int silent) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 832 | { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 833 | struct inode *inode; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 834 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 835 | struct btrfs_key key; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 836 | int err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 837 | |
| 838 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 839 | sb->s_magic = BTRFS_SUPER_MAGIC; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 840 | sb->s_op = &btrfs_super_ops; |
Al Viro | af53d29 | 2010-12-20 10:56:06 -0500 | [diff] [blame] | 841 | sb->s_d_op = &btrfs_dentry_operations; |
Balaji Rao | be6e8dc | 2008-07-21 02:01:56 +0530 | [diff] [blame] | 842 | sb->s_export_op = &btrfs_export_ops; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 843 | sb->s_xattr = btrfs_xattr_handlers; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 844 | sb->s_time_gran = 1; |
Chris Mason | 0eda294 | 2009-10-13 13:50:18 -0400 | [diff] [blame] | 845 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 846 | sb->s_flags |= MS_POSIXACL; |
Chris Ball | 49cf6f4 | 2009-09-29 13:51:04 -0400 | [diff] [blame] | 847 | #endif |
Josef Bacik | 0c4d2d9 | 2012-04-05 15:03:02 -0400 | [diff] [blame] | 848 | sb->s_flags |= MS_I_VERSION; |
Al Viro | ad2b2c8 | 2011-11-17 01:10:02 -0500 | [diff] [blame] | 849 | err = open_ctree(sb, fs_devices, (char *)data); |
| 850 | if (err) { |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 851 | printk("btrfs: open_ctree failed\n"); |
Al Viro | ad2b2c8 | 2011-11-17 01:10:02 -0500 | [diff] [blame] | 852 | return err; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 853 | } |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 854 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 855 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
| 856 | key.type = BTRFS_INODE_ITEM_KEY; |
| 857 | key.offset = 0; |
Al Viro | 98c7089 | 2011-11-17 01:00:31 -0500 | [diff] [blame] | 858 | inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 859 | if (IS_ERR(inode)) { |
| 860 | err = PTR_ERR(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 861 | goto fail_close; |
| 862 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 863 | |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 864 | sb->s_root = d_make_root(inode); |
| 865 | if (!sb->s_root) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 866 | err = -ENOMEM; |
| 867 | goto fail_close; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 868 | } |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 869 | |
Chris Mason | 6885f30 | 2008-02-20 16:11:05 -0500 | [diff] [blame] | 870 | save_mount_options(sb, data); |
Dan Magenheimer | 90a887c | 2011-05-26 10:01:56 -0600 | [diff] [blame] | 871 | cleancache_init_fs(sb); |
Al Viro | 59553ed | 2011-11-17 01:56:28 -0500 | [diff] [blame] | 872 | sb->s_flags |= MS_ACTIVE; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 873 | return 0; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 874 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 875 | fail_close: |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 876 | close_ctree(fs_info->tree_root); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 877 | return err; |
| 878 | } |
| 879 | |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 880 | int btrfs_sync_fs(struct super_block *sb, int wait) |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 881 | { |
| 882 | struct btrfs_trans_handle *trans; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 883 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
| 884 | struct btrfs_root *root = fs_info->tree_root; |
Chris Mason | df2ce34 | 2007-03-23 11:00:45 -0400 | [diff] [blame] | 885 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 886 | trace_btrfs_sync_fs(wait); |
| 887 | |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 888 | if (!wait) { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 889 | filemap_flush(fs_info->btree_inode->i_mapping); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 890 | return 0; |
| 891 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 892 | |
Josef Bacik | c73e293 | 2013-05-16 11:14:33 -0400 | [diff] [blame] | 893 | btrfs_wait_all_ordered_extents(fs_info, 1); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 894 | |
Miao Xie | d4edf39 | 2013-02-20 09:17:06 +0000 | [diff] [blame] | 895 | trans = btrfs_attach_transaction_barrier(root); |
Josef Bacik | 60376ce | 2012-09-14 10:34:40 -0400 | [diff] [blame] | 896 | if (IS_ERR(trans)) { |
Miao Xie | 354aa0f | 2012-09-20 01:54:00 -0600 | [diff] [blame] | 897 | /* no transaction, don't bother */ |
| 898 | if (PTR_ERR(trans) == -ENOENT) |
Josef Bacik | 60376ce | 2012-09-14 10:34:40 -0400 | [diff] [blame] | 899 | return 0; |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 900 | return PTR_ERR(trans); |
Josef Bacik | 60376ce | 2012-09-14 10:34:40 -0400 | [diff] [blame] | 901 | } |
Josef Bacik | bd7de2c | 2012-08-24 12:53:03 -0600 | [diff] [blame] | 902 | return btrfs_commit_transaction(trans, root); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 903 | } |
| 904 | |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 905 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 906 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 907 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
| 908 | struct btrfs_root *root = info->tree_root; |
Tsutomu Itoh | 200da64 | 2011-03-31 00:44:29 +0000 | [diff] [blame] | 909 | char *compress_type; |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 910 | |
| 911 | if (btrfs_test_opt(root, DEGRADED)) |
| 912 | seq_puts(seq, ",degraded"); |
| 913 | if (btrfs_test_opt(root, NODATASUM)) |
| 914 | seq_puts(seq, ",nodatasum"); |
| 915 | if (btrfs_test_opt(root, NODATACOW)) |
| 916 | seq_puts(seq, ",nodatacow"); |
| 917 | if (btrfs_test_opt(root, NOBARRIER)) |
| 918 | seq_puts(seq, ",nobarrier"); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 919 | if (info->max_inline != 8192 * 1024) |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 920 | seq_printf(seq, ",max_inline=%llu", |
| 921 | (unsigned long long)info->max_inline); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 922 | if (info->alloc_start != 0) |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 923 | seq_printf(seq, ",alloc_start=%llu", |
| 924 | (unsigned long long)info->alloc_start); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 925 | if (info->thread_pool_size != min_t(unsigned long, |
| 926 | num_online_cpus() + 2, 8)) |
| 927 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); |
Tsutomu Itoh | 200da64 | 2011-03-31 00:44:29 +0000 | [diff] [blame] | 928 | if (btrfs_test_opt(root, COMPRESS)) { |
| 929 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) |
| 930 | compress_type = "zlib"; |
| 931 | else |
| 932 | compress_type = "lzo"; |
| 933 | if (btrfs_test_opt(root, FORCE_COMPRESS)) |
| 934 | seq_printf(seq, ",compress-force=%s", compress_type); |
| 935 | else |
| 936 | seq_printf(seq, ",compress=%s", compress_type); |
| 937 | } |
Chris Mason | c289811 | 2009-06-10 09:51:32 -0400 | [diff] [blame] | 938 | if (btrfs_test_opt(root, NOSSD)) |
| 939 | seq_puts(seq, ",nossd"); |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 940 | if (btrfs_test_opt(root, SSD_SPREAD)) |
| 941 | seq_puts(seq, ",ssd_spread"); |
| 942 | else if (btrfs_test_opt(root, SSD)) |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 943 | seq_puts(seq, ",ssd"); |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 944 | if (btrfs_test_opt(root, NOTREELOG)) |
Sage Weil | 6b65c5c | 2009-05-14 13:52:21 -0400 | [diff] [blame] | 945 | seq_puts(seq, ",notreelog"); |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 946 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
Sage Weil | 6b65c5c | 2009-05-14 13:52:21 -0400 | [diff] [blame] | 947 | seq_puts(seq, ",flushoncommit"); |
Matthew Wilcox | 20a5239 | 2009-12-14 22:01:12 +0000 | [diff] [blame] | 948 | if (btrfs_test_opt(root, DISCARD)) |
| 949 | seq_puts(seq, ",discard"); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 950 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
| 951 | seq_puts(seq, ",noacl"); |
Tsutomu Itoh | 200da64 | 2011-03-31 00:44:29 +0000 | [diff] [blame] | 952 | if (btrfs_test_opt(root, SPACE_CACHE)) |
| 953 | seq_puts(seq, ",space_cache"); |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 954 | else |
David Sterba | 8965593 | 2011-11-11 10:14:57 -0500 | [diff] [blame] | 955 | seq_puts(seq, ",nospace_cache"); |
Tsutomu Itoh | 200da64 | 2011-03-31 00:44:29 +0000 | [diff] [blame] | 956 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
| 957 | seq_puts(seq, ",clear_cache"); |
| 958 | if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) |
| 959 | seq_puts(seq, ",user_subvol_rm_allowed"); |
David Sterba | 0942caa | 2011-06-28 15:10:37 +0000 | [diff] [blame] | 960 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) |
| 961 | seq_puts(seq, ",enospc_debug"); |
| 962 | if (btrfs_test_opt(root, AUTO_DEFRAG)) |
| 963 | seq_puts(seq, ",autodefrag"); |
| 964 | if (btrfs_test_opt(root, INODE_MAP_CACHE)) |
| 965 | seq_puts(seq, ",inode_cache"); |
Ilya Dryomov | 9555c6c | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 966 | if (btrfs_test_opt(root, SKIP_BALANCE)) |
| 967 | seq_puts(seq, ",skip_balance"); |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 968 | if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) |
| 969 | seq_puts(seq, ",fatal_errors=panic"); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 970 | return 0; |
| 971 | } |
| 972 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 973 | static int btrfs_test_super(struct super_block *s, void *data) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 974 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 975 | struct btrfs_fs_info *p = data; |
| 976 | struct btrfs_fs_info *fs_info = btrfs_sb(s); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 977 | |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 978 | return fs_info->fs_devices == p->fs_devices; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 979 | } |
| 980 | |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 981 | static int btrfs_set_super(struct super_block *s, void *data) |
| 982 | { |
Al Viro | 6de1d09 | 2011-11-17 01:29:09 -0500 | [diff] [blame] | 983 | int err = set_anon_super(s, data); |
| 984 | if (!err) |
| 985 | s->s_fs_info = data; |
| 986 | return err; |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 987 | } |
| 988 | |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 989 | /* |
David Sterba | f9d9ef6 | 2011-09-29 13:11:33 +0200 | [diff] [blame] | 990 | * subvolumes are identified by ino 256 |
| 991 | */ |
| 992 | static inline int is_subvolume_inode(struct inode *inode) |
| 993 | { |
| 994 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) |
| 995 | return 1; |
| 996 | return 0; |
| 997 | } |
| 998 | |
| 999 | /* |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1000 | * This will strip out the subvol=%s argument for an argument string and add |
| 1001 | * subvolid=0 to make sure we get the actual tree root for path walking to the |
| 1002 | * subvol we want. |
| 1003 | */ |
| 1004 | static char *setup_root_args(char *args) |
| 1005 | { |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 1006 | unsigned len = strlen(args) + 2 + 1; |
| 1007 | char *src, *dst, *buf; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1008 | |
| 1009 | /* |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 1010 | * We need the same args as before, but with this substitution: |
| 1011 | * s!subvol=[^,]+!subvolid=0! |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1012 | * |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 1013 | * Since the replacement string is up to 2 bytes longer than the |
| 1014 | * original, allocate strlen(args) + 2 + 1 bytes. |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1015 | */ |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1016 | |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 1017 | src = strstr(args, "subvol="); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1018 | /* This shouldn't happen, but just in case.. */ |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 1019 | if (!src) |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1020 | return NULL; |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 1021 | |
| 1022 | buf = dst = kmalloc(len, GFP_NOFS); |
| 1023 | if (!buf) |
| 1024 | return NULL; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1025 | |
| 1026 | /* |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 1027 | * If the subvol= arg is not at the start of the string, |
| 1028 | * copy whatever precedes it into buf. |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1029 | */ |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 1030 | if (src != args) { |
| 1031 | *src++ = '\0'; |
| 1032 | strcpy(buf, args); |
| 1033 | dst += strlen(args); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1034 | } |
| 1035 | |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 1036 | strcpy(dst, "subvolid=0"); |
| 1037 | dst += strlen("subvolid=0"); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1038 | |
| 1039 | /* |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 1040 | * If there is a "," after the original subvol=... string, |
| 1041 | * copy that suffix into our buffer. Otherwise, we're done. |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1042 | */ |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 1043 | src = strchr(src, ','); |
| 1044 | if (src) |
| 1045 | strcpy(dst, src); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1046 | |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 1047 | return buf; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1048 | } |
| 1049 | |
| 1050 | static struct dentry *mount_subvol(const char *subvol_name, int flags, |
| 1051 | const char *device_name, char *data) |
| 1052 | { |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1053 | struct dentry *root; |
| 1054 | struct vfsmount *mnt; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1055 | char *newargs; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1056 | |
| 1057 | newargs = setup_root_args(data); |
| 1058 | if (!newargs) |
| 1059 | return ERR_PTR(-ENOMEM); |
| 1060 | mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, |
| 1061 | newargs); |
| 1062 | kfree(newargs); |
| 1063 | if (IS_ERR(mnt)) |
| 1064 | return ERR_CAST(mnt); |
| 1065 | |
Al Viro | ea441d1 | 2011-11-16 21:43:59 -0500 | [diff] [blame] | 1066 | root = mount_subtree(mnt, subvol_name); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1067 | |
Al Viro | ea441d1 | 2011-11-16 21:43:59 -0500 | [diff] [blame] | 1068 | if (!IS_ERR(root) && !is_subvolume_inode(root->d_inode)) { |
| 1069 | struct super_block *s = root->d_sb; |
| 1070 | dput(root); |
| 1071 | root = ERR_PTR(-EINVAL); |
| 1072 | deactivate_locked_super(s); |
David Sterba | f9d9ef6 | 2011-09-29 13:11:33 +0200 | [diff] [blame] | 1073 | printk(KERN_ERR "btrfs: '%s' is not a valid subvolume\n", |
| 1074 | subvol_name); |
David Sterba | f9d9ef6 | 2011-09-29 13:11:33 +0200 | [diff] [blame] | 1075 | } |
| 1076 | |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1077 | return root; |
| 1078 | } |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1079 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 1080 | /* |
| 1081 | * Find a superblock for the given device / mount point. |
| 1082 | * |
| 1083 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions |
| 1084 | * for multiple device setup. Make sure to keep it in sync. |
| 1085 | */ |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 1086 | 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] | 1087 | const char *device_name, void *data) |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1088 | { |
| 1089 | struct block_device *bdev = NULL; |
| 1090 | struct super_block *s; |
| 1091 | struct dentry *root; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1092 | struct btrfs_fs_devices *fs_devices = NULL; |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1093 | struct btrfs_fs_info *fs_info = NULL; |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 1094 | fmode_t mode = FMODE_READ; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 1095 | char *subvol_name = NULL; |
| 1096 | u64 subvol_objectid = 0; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1097 | int error = 0; |
| 1098 | |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 1099 | if (!(flags & MS_RDONLY)) |
| 1100 | mode |= FMODE_WRITE; |
| 1101 | |
| 1102 | error = btrfs_parse_early_options(data, mode, fs_type, |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 1103 | &subvol_name, &subvol_objectid, |
David Sterba | 5e2a4b2 | 2013-03-20 13:21:10 +0000 | [diff] [blame] | 1104 | &fs_devices); |
Ilya Dryomov | f23c8af | 2011-11-08 19:15:05 +0200 | [diff] [blame] | 1105 | if (error) { |
| 1106 | kfree(subvol_name); |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 1107 | return ERR_PTR(error); |
Ilya Dryomov | f23c8af | 2011-11-08 19:15:05 +0200 | [diff] [blame] | 1108 | } |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 1109 | |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1110 | if (subvol_name) { |
| 1111 | root = mount_subvol(subvol_name, flags, device_name, data); |
| 1112 | kfree(subvol_name); |
| 1113 | return root; |
| 1114 | } |
| 1115 | |
David Sterba | 306e16c | 2011-04-19 14:29:38 +0200 | [diff] [blame] | 1116 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1117 | if (error) |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1118 | return ERR_PTR(error); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1119 | |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1120 | /* |
| 1121 | * Setup a dummy root and fs_info for test/set super. This is because |
| 1122 | * we don't actually fill this stuff out until open_ctree, but we need |
| 1123 | * it for searching for existing supers, so this lets us do that and |
| 1124 | * then open_ctree will properly initialize everything later. |
| 1125 | */ |
| 1126 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); |
Ilya Dryomov | 04d21a2 | 2011-11-09 14:41:22 +0200 | [diff] [blame] | 1127 | if (!fs_info) |
| 1128 | return ERR_PTR(-ENOMEM); |
| 1129 | |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1130 | fs_info->fs_devices = fs_devices; |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1131 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1132 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
| 1133 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
| 1134 | if (!fs_info->super_copy || !fs_info->super_for_commit) { |
| 1135 | error = -ENOMEM; |
Ilya Dryomov | 04d21a2 | 2011-11-09 14:41:22 +0200 | [diff] [blame] | 1136 | goto error_fs_info; |
| 1137 | } |
| 1138 | |
| 1139 | error = btrfs_open_devices(fs_devices, mode, fs_type); |
| 1140 | if (error) |
| 1141 | goto error_fs_info; |
| 1142 | |
| 1143 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { |
| 1144 | error = -EACCES; |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1145 | goto error_close_devices; |
| 1146 | } |
| 1147 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1148 | bdev = fs_devices->latest_bdev; |
David Howells | 9249e17 | 2012-06-25 12:55:37 +0100 | [diff] [blame] | 1149 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, |
| 1150 | fs_info); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1151 | if (IS_ERR(s)) { |
| 1152 | error = PTR_ERR(s); |
| 1153 | goto error_close_devices; |
| 1154 | } |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1155 | |
| 1156 | if (s->s_root) { |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1157 | btrfs_close_devices(fs_devices); |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1158 | free_fs_info(fs_info); |
Al Viro | 59553ed | 2011-11-17 01:56:28 -0500 | [diff] [blame] | 1159 | if ((flags ^ s->s_flags) & MS_RDONLY) |
| 1160 | error = -EBUSY; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1161 | } else { |
| 1162 | char b[BDEVNAME_SIZE]; |
| 1163 | |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1164 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1165 | btrfs_sb(s)->bdev_holder = fs_type; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1166 | error = btrfs_fill_super(s, fs_devices, data, |
| 1167 | flags & MS_SILENT ? 1 : 0); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1168 | } |
| 1169 | |
Al Viro | 59553ed | 2011-11-17 01:56:28 -0500 | [diff] [blame] | 1170 | root = !error ? get_default_root(s, subvol_objectid) : ERR_PTR(error); |
| 1171 | if (IS_ERR(root)) |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1172 | deactivate_locked_super(s); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1173 | |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 1174 | return root; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1175 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1176 | error_close_devices: |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1177 | btrfs_close_devices(fs_devices); |
Ilya Dryomov | 04d21a2 | 2011-11-09 14:41:22 +0200 | [diff] [blame] | 1178 | error_fs_info: |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1179 | free_fs_info(fs_info); |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 1180 | return ERR_PTR(error); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1181 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1182 | |
Sergei Trofimovich | 0d2450a | 2012-04-24 22:59:16 +0300 | [diff] [blame] | 1183 | static void btrfs_set_max_workers(struct btrfs_workers *workers, int new_limit) |
| 1184 | { |
| 1185 | spin_lock_irq(&workers->lock); |
| 1186 | workers->max_workers = new_limit; |
| 1187 | spin_unlock_irq(&workers->lock); |
| 1188 | } |
| 1189 | |
| 1190 | static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, |
| 1191 | int new_pool_size, int old_pool_size) |
| 1192 | { |
| 1193 | if (new_pool_size == old_pool_size) |
| 1194 | return; |
| 1195 | |
| 1196 | fs_info->thread_pool_size = new_pool_size; |
| 1197 | |
| 1198 | printk(KERN_INFO "btrfs: resize thread pool %d -> %d\n", |
| 1199 | old_pool_size, new_pool_size); |
| 1200 | |
| 1201 | btrfs_set_max_workers(&fs_info->generic_worker, new_pool_size); |
| 1202 | btrfs_set_max_workers(&fs_info->workers, new_pool_size); |
| 1203 | btrfs_set_max_workers(&fs_info->delalloc_workers, new_pool_size); |
| 1204 | btrfs_set_max_workers(&fs_info->submit_workers, new_pool_size); |
| 1205 | btrfs_set_max_workers(&fs_info->caching_workers, new_pool_size); |
| 1206 | btrfs_set_max_workers(&fs_info->fixup_workers, new_pool_size); |
| 1207 | btrfs_set_max_workers(&fs_info->endio_workers, new_pool_size); |
| 1208 | btrfs_set_max_workers(&fs_info->endio_meta_workers, new_pool_size); |
| 1209 | btrfs_set_max_workers(&fs_info->endio_meta_write_workers, new_pool_size); |
| 1210 | btrfs_set_max_workers(&fs_info->endio_write_workers, new_pool_size); |
| 1211 | btrfs_set_max_workers(&fs_info->endio_freespace_worker, new_pool_size); |
| 1212 | btrfs_set_max_workers(&fs_info->delayed_workers, new_pool_size); |
| 1213 | btrfs_set_max_workers(&fs_info->readahead_workers, new_pool_size); |
Stefan Behrens | ff023aa | 2012-11-06 11:43:11 +0100 | [diff] [blame] | 1214 | btrfs_set_max_workers(&fs_info->scrub_wr_completion_workers, |
| 1215 | new_pool_size); |
Sergei Trofimovich | 0d2450a | 2012-04-24 22:59:16 +0300 | [diff] [blame] | 1216 | } |
| 1217 | |
Miao Xie | f42a34b | 2013-04-11 10:29:35 +0000 | [diff] [blame] | 1218 | static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 1219 | { |
| 1220 | set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); |
Miao Xie | f42a34b | 2013-04-11 10:29:35 +0000 | [diff] [blame] | 1221 | } |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 1222 | |
Miao Xie | f42a34b | 2013-04-11 10:29:35 +0000 | [diff] [blame] | 1223 | static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, |
| 1224 | unsigned long old_opts, int flags) |
| 1225 | { |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 1226 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
| 1227 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || |
| 1228 | (flags & MS_RDONLY))) { |
| 1229 | /* wait for any defraggers to finish */ |
| 1230 | wait_event(fs_info->transaction_wait, |
| 1231 | (atomic_read(&fs_info->defrag_running) == 0)); |
| 1232 | if (flags & MS_RDONLY) |
| 1233 | sync_filesystem(fs_info->sb); |
| 1234 | } |
| 1235 | } |
| 1236 | |
| 1237 | static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, |
| 1238 | unsigned long old_opts) |
| 1239 | { |
| 1240 | /* |
| 1241 | * We need cleanup all defragable inodes if the autodefragment is |
| 1242 | * close or the fs is R/O. |
| 1243 | */ |
| 1244 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
| 1245 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || |
| 1246 | (fs_info->sb->s_flags & MS_RDONLY))) { |
| 1247 | btrfs_cleanup_defrag_inodes(fs_info); |
| 1248 | } |
| 1249 | |
| 1250 | clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); |
| 1251 | } |
| 1252 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1253 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
| 1254 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1255 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
| 1256 | struct btrfs_root *root = fs_info->tree_root; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1257 | unsigned old_flags = sb->s_flags; |
| 1258 | unsigned long old_opts = fs_info->mount_opt; |
| 1259 | unsigned long old_compress_type = fs_info->compress_type; |
| 1260 | u64 old_max_inline = fs_info->max_inline; |
| 1261 | u64 old_alloc_start = fs_info->alloc_start; |
| 1262 | int old_thread_pool_size = fs_info->thread_pool_size; |
| 1263 | unsigned int old_metadata_ratio = fs_info->metadata_ratio; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1264 | int ret; |
| 1265 | |
Miao Xie | f42a34b | 2013-04-11 10:29:35 +0000 | [diff] [blame] | 1266 | btrfs_remount_prepare(fs_info); |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 1267 | |
Chris Mason | b288052 | 2009-02-12 09:37:35 -0500 | [diff] [blame] | 1268 | ret = btrfs_parse_options(root, data); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1269 | if (ret) { |
| 1270 | ret = -EINVAL; |
| 1271 | goto restore; |
| 1272 | } |
Chris Mason | b288052 | 2009-02-12 09:37:35 -0500 | [diff] [blame] | 1273 | |
Miao Xie | f42a34b | 2013-04-11 10:29:35 +0000 | [diff] [blame] | 1274 | btrfs_remount_begin(fs_info, old_opts, *flags); |
Sergei Trofimovich | 0d2450a | 2012-04-24 22:59:16 +0300 | [diff] [blame] | 1275 | btrfs_resize_thread_pool(fs_info, |
| 1276 | fs_info->thread_pool_size, old_thread_pool_size); |
| 1277 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1278 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 1279 | goto out; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1280 | |
| 1281 | if (*flags & MS_RDONLY) { |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 1282 | /* |
| 1283 | * this also happens on 'umount -rf' or on shutdown, when |
| 1284 | * the filesystem is busy. |
| 1285 | */ |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1286 | sb->s_flags |= MS_RDONLY; |
| 1287 | |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 1288 | btrfs_dev_replace_suspend_for_unmount(fs_info); |
| 1289 | btrfs_scrub_cancel(fs_info); |
Miao Xie | 061594e | 2013-05-15 07:48:17 +0000 | [diff] [blame] | 1290 | btrfs_pause_balance(fs_info); |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 1291 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1292 | ret = btrfs_commit_super(root); |
| 1293 | if (ret) |
| 1294 | goto restore; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1295 | } else { |
Sergei Trofimovich | 8a3db18 | 2012-04-16 06:44:37 +0300 | [diff] [blame] | 1296 | if (fs_info->fs_devices->rw_devices == 0) { |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1297 | ret = -EACCES; |
| 1298 | goto restore; |
Sergei Trofimovich | 8a3db18 | 2012-04-16 06:44:37 +0300 | [diff] [blame] | 1299 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1300 | |
Stefan Behrens | 292fd7f | 2012-10-30 17:16:16 +0000 | [diff] [blame] | 1301 | if (fs_info->fs_devices->missing_devices > |
| 1302 | fs_info->num_tolerated_disk_barrier_failures && |
| 1303 | !(*flags & MS_RDONLY)) { |
| 1304 | printk(KERN_WARNING |
| 1305 | "Btrfs: too many missing devices, writeable remount is not allowed\n"); |
| 1306 | ret = -EACCES; |
| 1307 | goto restore; |
| 1308 | } |
| 1309 | |
Sergei Trofimovich | 8a3db18 | 2012-04-16 06:44:37 +0300 | [diff] [blame] | 1310 | if (btrfs_super_log_root(fs_info->super_copy) != 0) { |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1311 | ret = -EINVAL; |
| 1312 | goto restore; |
Sergei Trofimovich | 8a3db18 | 2012-04-16 06:44:37 +0300 | [diff] [blame] | 1313 | } |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1314 | |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1315 | ret = btrfs_cleanup_fs_roots(fs_info); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1316 | if (ret) |
| 1317 | goto restore; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1318 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1319 | /* recover relocation */ |
| 1320 | ret = btrfs_recover_relocation(root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1321 | if (ret) |
| 1322 | goto restore; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1323 | |
Ilya Dryomov | 2b6ba62 | 2012-06-22 12:24:13 -0600 | [diff] [blame] | 1324 | ret = btrfs_resume_balance_async(fs_info); |
| 1325 | if (ret) |
| 1326 | goto restore; |
| 1327 | |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 1328 | ret = btrfs_resume_dev_replace_async(fs_info); |
| 1329 | if (ret) { |
| 1330 | pr_warn("btrfs: failed to resume dev_replace\n"); |
| 1331 | goto restore; |
| 1332 | } |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1333 | sb->s_flags &= ~MS_RDONLY; |
| 1334 | } |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 1335 | out: |
| 1336 | btrfs_remount_cleanup(fs_info, old_opts); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1337 | return 0; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1338 | |
| 1339 | restore: |
| 1340 | /* We've hit an error - don't reset MS_RDONLY */ |
| 1341 | if (sb->s_flags & MS_RDONLY) |
| 1342 | old_flags |= MS_RDONLY; |
| 1343 | sb->s_flags = old_flags; |
| 1344 | fs_info->mount_opt = old_opts; |
| 1345 | fs_info->compress_type = old_compress_type; |
| 1346 | fs_info->max_inline = old_max_inline; |
Miao Xie | c018dae | 2013-01-29 10:07:33 +0000 | [diff] [blame] | 1347 | mutex_lock(&fs_info->chunk_mutex); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1348 | fs_info->alloc_start = old_alloc_start; |
Miao Xie | c018dae | 2013-01-29 10:07:33 +0000 | [diff] [blame] | 1349 | mutex_unlock(&fs_info->chunk_mutex); |
Sergei Trofimovich | 0d2450a | 2012-04-24 22:59:16 +0300 | [diff] [blame] | 1350 | btrfs_resize_thread_pool(fs_info, |
| 1351 | old_thread_pool_size, fs_info->thread_pool_size); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1352 | fs_info->metadata_ratio = old_metadata_ratio; |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 1353 | btrfs_remount_cleanup(fs_info, old_opts); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1354 | return ret; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1355 | } |
| 1356 | |
Arne Jansen | bcd5374 | 2011-04-12 10:43:21 +0200 | [diff] [blame] | 1357 | /* Used to sort the devices by max_avail(descending sort) */ |
| 1358 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, |
| 1359 | const void *dev_info2) |
| 1360 | { |
| 1361 | if (((struct btrfs_device_info *)dev_info1)->max_avail > |
| 1362 | ((struct btrfs_device_info *)dev_info2)->max_avail) |
| 1363 | return -1; |
| 1364 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < |
| 1365 | ((struct btrfs_device_info *)dev_info2)->max_avail) |
| 1366 | return 1; |
| 1367 | else |
| 1368 | return 0; |
| 1369 | } |
| 1370 | |
| 1371 | /* |
| 1372 | * sort the devices by max_avail, in which max free extent size of each device |
| 1373 | * is stored.(Descending Sort) |
| 1374 | */ |
| 1375 | static inline void btrfs_descending_sort_devices( |
| 1376 | struct btrfs_device_info *devices, |
| 1377 | size_t nr_devices) |
| 1378 | { |
| 1379 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), |
| 1380 | btrfs_cmp_device_free_bytes, NULL); |
| 1381 | } |
| 1382 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1383 | /* |
| 1384 | * The helper to calc the free space on the devices that can be used to store |
| 1385 | * file data. |
| 1386 | */ |
| 1387 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) |
| 1388 | { |
| 1389 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1390 | struct btrfs_device_info *devices_info; |
| 1391 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
| 1392 | struct btrfs_device *device; |
| 1393 | u64 skip_space; |
| 1394 | u64 type; |
| 1395 | u64 avail_space; |
| 1396 | u64 used_space; |
| 1397 | u64 min_stripe_size; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1398 | int min_stripes = 1, num_stripes = 1; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1399 | int i = 0, nr_devices; |
| 1400 | int ret; |
| 1401 | |
Li Zefan | b772a86 | 2011-11-28 16:43:00 +0800 | [diff] [blame] | 1402 | nr_devices = fs_info->fs_devices->open_devices; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1403 | BUG_ON(!nr_devices); |
| 1404 | |
| 1405 | devices_info = kmalloc(sizeof(*devices_info) * nr_devices, |
| 1406 | GFP_NOFS); |
| 1407 | if (!devices_info) |
| 1408 | return -ENOMEM; |
| 1409 | |
| 1410 | /* calc min stripe number for data space alloction */ |
| 1411 | type = btrfs_get_alloc_profile(root, 1); |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1412 | if (type & BTRFS_BLOCK_GROUP_RAID0) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1413 | min_stripes = 2; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1414 | num_stripes = nr_devices; |
| 1415 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1416 | min_stripes = 2; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1417 | num_stripes = 2; |
| 1418 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1419 | min_stripes = 4; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1420 | num_stripes = 4; |
| 1421 | } |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1422 | |
| 1423 | if (type & BTRFS_BLOCK_GROUP_DUP) |
| 1424 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; |
| 1425 | else |
| 1426 | min_stripe_size = BTRFS_STRIPE_LEN; |
| 1427 | |
Li Zefan | b772a86 | 2011-11-28 16:43:00 +0800 | [diff] [blame] | 1428 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 1429 | if (!device->in_fs_metadata || !device->bdev || |
| 1430 | device->is_tgtdev_for_dev_replace) |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1431 | continue; |
| 1432 | |
| 1433 | avail_space = device->total_bytes - device->bytes_used; |
| 1434 | |
| 1435 | /* align with stripe_len */ |
| 1436 | do_div(avail_space, BTRFS_STRIPE_LEN); |
| 1437 | avail_space *= BTRFS_STRIPE_LEN; |
| 1438 | |
| 1439 | /* |
| 1440 | * In order to avoid overwritting the superblock on the drive, |
| 1441 | * btrfs starts at an offset of at least 1MB when doing chunk |
| 1442 | * allocation. |
| 1443 | */ |
| 1444 | skip_space = 1024 * 1024; |
| 1445 | |
| 1446 | /* user can set the offset in fs_info->alloc_start. */ |
| 1447 | if (fs_info->alloc_start + BTRFS_STRIPE_LEN <= |
| 1448 | device->total_bytes) |
| 1449 | skip_space = max(fs_info->alloc_start, skip_space); |
| 1450 | |
| 1451 | /* |
| 1452 | * btrfs can not use the free space in [0, skip_space - 1], |
| 1453 | * we must subtract it from the total. In order to implement |
| 1454 | * it, we account the used space in this range first. |
| 1455 | */ |
| 1456 | ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1, |
| 1457 | &used_space); |
| 1458 | if (ret) { |
| 1459 | kfree(devices_info); |
| 1460 | return ret; |
| 1461 | } |
| 1462 | |
| 1463 | /* calc the free space in [0, skip_space - 1] */ |
| 1464 | skip_space -= used_space; |
| 1465 | |
| 1466 | /* |
| 1467 | * we can use the free space in [0, skip_space - 1], subtract |
| 1468 | * it from the total. |
| 1469 | */ |
| 1470 | if (avail_space && avail_space >= skip_space) |
| 1471 | avail_space -= skip_space; |
| 1472 | else |
| 1473 | avail_space = 0; |
| 1474 | |
| 1475 | if (avail_space < min_stripe_size) |
| 1476 | continue; |
| 1477 | |
| 1478 | devices_info[i].dev = device; |
| 1479 | devices_info[i].max_avail = avail_space; |
| 1480 | |
| 1481 | i++; |
| 1482 | } |
| 1483 | |
| 1484 | nr_devices = i; |
| 1485 | |
| 1486 | btrfs_descending_sort_devices(devices_info, nr_devices); |
| 1487 | |
| 1488 | i = nr_devices - 1; |
| 1489 | avail_space = 0; |
| 1490 | while (nr_devices >= min_stripes) { |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1491 | if (num_stripes > nr_devices) |
| 1492 | num_stripes = nr_devices; |
| 1493 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1494 | if (devices_info[i].max_avail >= min_stripe_size) { |
| 1495 | int j; |
| 1496 | u64 alloc_size; |
| 1497 | |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1498 | avail_space += devices_info[i].max_avail * num_stripes; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1499 | alloc_size = devices_info[i].max_avail; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1500 | for (j = i + 1 - num_stripes; j <= i; j++) |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1501 | devices_info[j].max_avail -= alloc_size; |
| 1502 | } |
| 1503 | i--; |
| 1504 | nr_devices--; |
| 1505 | } |
| 1506 | |
| 1507 | kfree(devices_info); |
| 1508 | *free_bytes = avail_space; |
| 1509 | return 0; |
| 1510 | } |
| 1511 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1512 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 1513 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1514 | struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); |
| 1515 | struct btrfs_super_block *disk_super = fs_info->super_copy; |
| 1516 | struct list_head *head = &fs_info->space_info; |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 1517 | struct btrfs_space_info *found; |
| 1518 | u64 total_used = 0; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1519 | u64 total_free_data = 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1520 | int bits = dentry->d_sb->s_blocksize_bits; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1521 | __be32 *fsid = (__be32 *)fs_info->fsid; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1522 | int ret; |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1523 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1524 | /* holding chunk_muext to avoid allocating new chunks */ |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1525 | mutex_lock(&fs_info->chunk_mutex); |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 1526 | rcu_read_lock(); |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 1527 | list_for_each_entry_rcu(found, head, list) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1528 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
| 1529 | total_free_data += found->disk_total - found->disk_used; |
| 1530 | total_free_data -= |
| 1531 | btrfs_account_ro_block_groups_free_space(found); |
| 1532 | } |
| 1533 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 1534 | total_used += found->disk_used; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 1535 | } |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 1536 | rcu_read_unlock(); |
| 1537 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1538 | buf->f_namelen = BTRFS_NAME_LEN; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1539 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 1540 | buf->f_bfree = buf->f_blocks - (total_used >> bits); |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1541 | buf->f_bsize = dentry->d_sb->s_blocksize; |
| 1542 | buf->f_type = BTRFS_SUPER_MAGIC; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1543 | buf->f_bavail = total_free_data; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1544 | ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1545 | if (ret) { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1546 | mutex_unlock(&fs_info->chunk_mutex); |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1547 | return ret; |
| 1548 | } |
| 1549 | buf->f_bavail += total_free_data; |
| 1550 | buf->f_bavail = buf->f_bavail >> bits; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1551 | mutex_unlock(&fs_info->chunk_mutex); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1552 | |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 1553 | /* We treat it as constant endianness (it doesn't matter _which_) |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1554 | because we want the fsid to come out the same whether mounted |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 1555 | on a big-endian or little-endian host */ |
| 1556 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); |
| 1557 | 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] | 1558 | /* Mask in the root object ID too, to disambiguate subvols */ |
| 1559 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; |
| 1560 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; |
| 1561 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1562 | return 0; |
| 1563 | } |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 1564 | |
Al Viro | aea52e1 | 2011-11-17 01:22:46 -0500 | [diff] [blame] | 1565 | static void btrfs_kill_super(struct super_block *sb) |
| 1566 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1567 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
Al Viro | aea52e1 | 2011-11-17 01:22:46 -0500 | [diff] [blame] | 1568 | kill_anon_super(sb); |
Al Viro | d22ca7d | 2011-11-17 01:46:50 -0500 | [diff] [blame] | 1569 | free_fs_info(fs_info); |
Al Viro | aea52e1 | 2011-11-17 01:22:46 -0500 | [diff] [blame] | 1570 | } |
| 1571 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1572 | static struct file_system_type btrfs_fs_type = { |
| 1573 | .owner = THIS_MODULE, |
| 1574 | .name = "btrfs", |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 1575 | .mount = btrfs_mount, |
Al Viro | aea52e1 | 2011-11-17 01:22:46 -0500 | [diff] [blame] | 1576 | .kill_sb = btrfs_kill_super, |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1577 | .fs_flags = FS_REQUIRES_DEV, |
| 1578 | }; |
Eric W. Biederman | 7f78e03 | 2013-03-02 19:39:14 -0800 | [diff] [blame] | 1579 | MODULE_ALIAS_FS("btrfs"); |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1580 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1581 | /* |
| 1582 | * used by btrfsctl to scan devices when no FS is mounted |
| 1583 | */ |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1584 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
| 1585 | unsigned long arg) |
| 1586 | { |
| 1587 | struct btrfs_ioctl_vol_args *vol; |
| 1588 | struct btrfs_fs_devices *fs_devices; |
Chris Mason | c071fcf | 2009-01-16 11:59:08 -0500 | [diff] [blame] | 1589 | int ret = -ENOTTY; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1590 | |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 1591 | if (!capable(CAP_SYS_ADMIN)) |
| 1592 | return -EPERM; |
| 1593 | |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 1594 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
| 1595 | if (IS_ERR(vol)) |
| 1596 | return PTR_ERR(vol); |
Chris Mason | c071fcf | 2009-01-16 11:59:08 -0500 | [diff] [blame] | 1597 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1598 | switch (cmd) { |
| 1599 | case BTRFS_IOC_SCAN_DEV: |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 1600 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1601 | &btrfs_fs_type, &fs_devices); |
| 1602 | break; |
Josef Bacik | 02db084 | 2012-06-21 16:03:58 -0400 | [diff] [blame] | 1603 | case BTRFS_IOC_DEVICES_READY: |
| 1604 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
| 1605 | &btrfs_fs_type, &fs_devices); |
| 1606 | if (ret) |
| 1607 | break; |
| 1608 | ret = !(fs_devices->num_devices == fs_devices->total_devices); |
| 1609 | break; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1610 | } |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 1611 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1612 | kfree(vol); |
Linda Knippers | f819d83 | 2008-06-09 22:17:11 -0400 | [diff] [blame] | 1613 | return ret; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1614 | } |
| 1615 | |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1616 | static int btrfs_freeze(struct super_block *sb) |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1617 | { |
Miao Xie | 354aa0f | 2012-09-20 01:54:00 -0600 | [diff] [blame] | 1618 | struct btrfs_trans_handle *trans; |
| 1619 | struct btrfs_root *root = btrfs_sb(sb)->tree_root; |
| 1620 | |
Miao Xie | d4edf39 | 2013-02-20 09:17:06 +0000 | [diff] [blame] | 1621 | trans = btrfs_attach_transaction_barrier(root); |
Miao Xie | 354aa0f | 2012-09-20 01:54:00 -0600 | [diff] [blame] | 1622 | if (IS_ERR(trans)) { |
| 1623 | /* no transaction, don't bother */ |
| 1624 | if (PTR_ERR(trans) == -ENOENT) |
| 1625 | return 0; |
| 1626 | return PTR_ERR(trans); |
| 1627 | } |
| 1628 | return btrfs_commit_transaction(trans, root); |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1629 | } |
| 1630 | |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1631 | static int btrfs_unfreeze(struct super_block *sb) |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1632 | { |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1633 | return 0; |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1634 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1635 | |
Josef Bacik | 9c5085c | 2012-06-05 14:13:12 -0400 | [diff] [blame] | 1636 | static int btrfs_show_devname(struct seq_file *m, struct dentry *root) |
| 1637 | { |
| 1638 | struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); |
| 1639 | struct btrfs_fs_devices *cur_devices; |
| 1640 | struct btrfs_device *dev, *first_dev = NULL; |
| 1641 | struct list_head *head; |
| 1642 | struct rcu_string *name; |
| 1643 | |
| 1644 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
| 1645 | cur_devices = fs_info->fs_devices; |
| 1646 | while (cur_devices) { |
| 1647 | head = &cur_devices->devices; |
| 1648 | list_for_each_entry(dev, head, dev_list) { |
Josef Bacik | aa9ddcd | 2012-08-02 10:22:20 -0400 | [diff] [blame] | 1649 | if (dev->missing) |
| 1650 | continue; |
Josef Bacik | 9c5085c | 2012-06-05 14:13:12 -0400 | [diff] [blame] | 1651 | if (!first_dev || dev->devid < first_dev->devid) |
| 1652 | first_dev = dev; |
| 1653 | } |
| 1654 | cur_devices = cur_devices->seed; |
| 1655 | } |
| 1656 | |
| 1657 | if (first_dev) { |
| 1658 | rcu_read_lock(); |
| 1659 | name = rcu_dereference(first_dev->name); |
| 1660 | seq_escape(m, name->str, " \t\n\\"); |
| 1661 | rcu_read_unlock(); |
| 1662 | } else { |
| 1663 | WARN_ON(1); |
| 1664 | } |
| 1665 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 1666 | return 0; |
| 1667 | } |
| 1668 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 1669 | static const struct super_operations btrfs_super_ops = { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1670 | .drop_inode = btrfs_drop_inode, |
Al Viro | bd55597 | 2010-06-07 11:35:40 -0400 | [diff] [blame] | 1671 | .evict_inode = btrfs_evict_inode, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1672 | .put_super = btrfs_put_super, |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1673 | .sync_fs = btrfs_sync_fs, |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 1674 | .show_options = btrfs_show_options, |
Josef Bacik | 9c5085c | 2012-06-05 14:13:12 -0400 | [diff] [blame] | 1675 | .show_devname = btrfs_show_devname, |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 1676 | .write_inode = btrfs_write_inode, |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1677 | .alloc_inode = btrfs_alloc_inode, |
| 1678 | .destroy_inode = btrfs_destroy_inode, |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1679 | .statfs = btrfs_statfs, |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1680 | .remount_fs = btrfs_remount, |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1681 | .freeze_fs = btrfs_freeze, |
| 1682 | .unfreeze_fs = btrfs_unfreeze, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1683 | }; |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1684 | |
| 1685 | static const struct file_operations btrfs_ctl_fops = { |
| 1686 | .unlocked_ioctl = btrfs_control_ioctl, |
| 1687 | .compat_ioctl = btrfs_control_ioctl, |
| 1688 | .owner = THIS_MODULE, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1689 | .llseek = noop_llseek, |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1690 | }; |
| 1691 | |
| 1692 | static struct miscdevice btrfs_misc = { |
Kay Sievers | 578454f | 2010-05-20 18:07:20 +0200 | [diff] [blame] | 1693 | .minor = BTRFS_MINOR, |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1694 | .name = "btrfs-control", |
| 1695 | .fops = &btrfs_ctl_fops |
| 1696 | }; |
| 1697 | |
Kay Sievers | 578454f | 2010-05-20 18:07:20 +0200 | [diff] [blame] | 1698 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
| 1699 | MODULE_ALIAS("devname:btrfs-control"); |
| 1700 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1701 | static int btrfs_interface_init(void) |
| 1702 | { |
| 1703 | return misc_register(&btrfs_misc); |
| 1704 | } |
| 1705 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1706 | static void btrfs_interface_exit(void) |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1707 | { |
| 1708 | if (misc_deregister(&btrfs_misc) < 0) |
Daniel J Blueman | 4894066 | 2012-05-07 06:35:38 -0600 | [diff] [blame] | 1709 | printk(KERN_INFO "btrfs: misc_deregister failed for control device\n"); |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1710 | } |
| 1711 | |
David Sterba | 8596560 | 2013-04-30 16:51:59 +0000 | [diff] [blame] | 1712 | static void btrfs_print_info(void) |
| 1713 | { |
| 1714 | printk(KERN_INFO "Btrfs loaded" |
| 1715 | #ifdef CONFIG_BTRFS_DEBUG |
| 1716 | ", debug=on" |
| 1717 | #endif |
| 1718 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
| 1719 | ", integrity-checker=on" |
| 1720 | #endif |
| 1721 | "\n"); |
| 1722 | } |
| 1723 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1724 | static int __init init_btrfs_fs(void) |
| 1725 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1726 | int err; |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1727 | |
| 1728 | err = btrfs_init_sysfs(); |
| 1729 | if (err) |
| 1730 | return err; |
| 1731 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1732 | btrfs_init_compress(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1733 | |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1734 | err = btrfs_init_cachep(); |
| 1735 | if (err) |
| 1736 | goto free_compress; |
| 1737 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1738 | err = extent_io_init(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1739 | if (err) |
| 1740 | goto free_cachep; |
| 1741 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1742 | err = extent_map_init(); |
| 1743 | if (err) |
| 1744 | goto free_extent_io; |
| 1745 | |
Miao Xie | 6352b91 | 2012-09-06 04:01:51 -0600 | [diff] [blame] | 1746 | err = ordered_data_init(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1747 | if (err) |
| 1748 | goto free_extent_map; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1749 | |
Miao Xie | 6352b91 | 2012-09-06 04:01:51 -0600 | [diff] [blame] | 1750 | err = btrfs_delayed_inode_init(); |
| 1751 | if (err) |
| 1752 | goto free_ordered_data; |
| 1753 | |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 1754 | err = btrfs_auto_defrag_init(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1755 | if (err) |
| 1756 | goto free_delayed_inode; |
| 1757 | |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 1758 | err = btrfs_delayed_ref_init(); |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 1759 | if (err) |
| 1760 | goto free_auto_defrag; |
| 1761 | |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 1762 | err = btrfs_interface_init(); |
| 1763 | if (err) |
| 1764 | goto free_delayed_ref; |
| 1765 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1766 | err = register_filesystem(&btrfs_fs_type); |
| 1767 | if (err) |
| 1768 | goto unregister_ioctl; |
Chris Mason | b3c3da7 | 2008-07-23 12:12:13 -0400 | [diff] [blame] | 1769 | |
Jan Schmidt | e565d4b | 2012-03-23 17:14:20 +0100 | [diff] [blame] | 1770 | btrfs_init_lockdep(); |
| 1771 | |
David Sterba | 8596560 | 2013-04-30 16:51:59 +0000 | [diff] [blame] | 1772 | btrfs_print_info(); |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 1773 | btrfs_test_free_space_cache(); |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 1774 | |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1775 | return 0; |
| 1776 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1777 | unregister_ioctl: |
| 1778 | btrfs_interface_exit(); |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 1779 | free_delayed_ref: |
| 1780 | btrfs_delayed_ref_exit(); |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 1781 | free_auto_defrag: |
| 1782 | btrfs_auto_defrag_exit(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1783 | free_delayed_inode: |
| 1784 | btrfs_delayed_inode_exit(); |
Miao Xie | 6352b91 | 2012-09-06 04:01:51 -0600 | [diff] [blame] | 1785 | free_ordered_data: |
| 1786 | ordered_data_exit(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1787 | free_extent_map: |
| 1788 | extent_map_exit(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1789 | free_extent_io: |
| 1790 | extent_io_exit(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1791 | free_cachep: |
| 1792 | btrfs_destroy_cachep(); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1793 | free_compress: |
| 1794 | btrfs_exit_compress(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1795 | btrfs_exit_sysfs(); |
| 1796 | return err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1797 | } |
| 1798 | |
| 1799 | static void __exit exit_btrfs_fs(void) |
| 1800 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1801 | btrfs_destroy_cachep(); |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 1802 | btrfs_delayed_ref_exit(); |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 1803 | btrfs_auto_defrag_exit(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1804 | btrfs_delayed_inode_exit(); |
Miao Xie | 6352b91 | 2012-09-06 04:01:51 -0600 | [diff] [blame] | 1805 | ordered_data_exit(); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1806 | extent_map_exit(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1807 | extent_io_exit(); |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1808 | btrfs_interface_exit(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1809 | unregister_filesystem(&btrfs_fs_type); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1810 | btrfs_exit_sysfs(); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1811 | btrfs_cleanup_fs_uuids(); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1812 | btrfs_exit_compress(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1813 | } |
| 1814 | |
| 1815 | module_init(init_btrfs_fs) |
| 1816 | module_exit(exit_btrfs_fs) |
| 1817 | |
| 1818 | MODULE_LICENSE("GPL"); |