Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
| 18 | |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 19 | #include <linux/blkdev.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 20 | #include <linux/module.h> |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 21 | #include <linux/buffer_head.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 22 | #include <linux/fs.h> |
| 23 | #include <linux/pagemap.h> |
| 24 | #include <linux/highmem.h> |
| 25 | #include <linux/time.h> |
| 26 | #include <linux/init.h> |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 27 | #include <linux/seq_file.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 28 | #include <linux/string.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 29 | #include <linux/backing-dev.h> |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 30 | #include <linux/mount.h> |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 31 | #include <linux/mpage.h> |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 32 | #include <linux/swap.h> |
| 33 | #include <linux/writeback.h> |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 34 | #include <linux/statfs.h> |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 35 | #include <linux/compat.h> |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 36 | #include <linux/parser.h> |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 37 | #include <linux/ctype.h> |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 38 | #include <linux/namei.h> |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 39 | #include <linux/miscdevice.h> |
Qinghuang Feng | 1bcbf31 | 2009-01-15 13:51:03 -0800 | [diff] [blame] | 40 | #include <linux/magic.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 41 | #include <linux/slab.h> |
Dan Magenheimer | 90a887c | 2011-05-26 10:01:56 -0600 | [diff] [blame] | 42 | #include <linux/cleancache.h> |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 43 | #include <linux/ratelimit.h> |
Chris Mason | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 44 | #include "compat.h" |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 45 | #include "delayed-inode.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 46 | #include "ctree.h" |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 47 | #include "disk-io.h" |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 48 | #include "transaction.h" |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 49 | #include "btrfs_inode.h" |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 50 | #include "ioctl.h" |
Chris Mason | 3a68637 | 2007-05-24 13:35:57 -0400 | [diff] [blame] | 51 | #include "print-tree.h" |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 52 | #include "xattr.h" |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 53 | #include "volumes.h" |
Chris Mason | b3c3da7 | 2008-07-23 12:12:13 -0400 | [diff] [blame] | 54 | #include "version.h" |
Balaji Rao | be6e8dc | 2008-07-21 02:01:56 +0530 | [diff] [blame] | 55 | #include "export.h" |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 56 | #include "compression.h" |
Josef Bacik | 9c5085c | 2012-06-05 14:13:12 -0400 | [diff] [blame] | 57 | #include "rcu-string.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 58 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 59 | #define CREATE_TRACE_POINTS |
| 60 | #include <trace/events/btrfs.h> |
| 61 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 62 | static const struct super_operations btrfs_super_ops; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 63 | static struct file_system_type btrfs_fs_type; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 64 | |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 65 | static const char *btrfs_decode_error(struct btrfs_fs_info *fs_info, int errno, |
| 66 | char nbuf[16]) |
| 67 | { |
| 68 | char *errstr = NULL; |
| 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; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 83 | default: |
| 84 | if (nbuf) { |
| 85 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) |
| 86 | errstr = nbuf; |
| 87 | } |
| 88 | break; |
| 89 | } |
| 90 | |
| 91 | return errstr; |
| 92 | } |
| 93 | |
| 94 | static void __save_error_info(struct btrfs_fs_info *fs_info) |
| 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 | */ |
| 100 | fs_info->fs_state = BTRFS_SUPER_FLAG_ERROR; |
| 101 | } |
| 102 | |
| 103 | /* NOTE: |
| 104 | * We move write_super stuff at umount in order to avoid deadlock |
| 105 | * for umount hold all lock. |
| 106 | */ |
| 107 | static void save_error_info(struct btrfs_fs_info *fs_info) |
| 108 | { |
| 109 | __save_error_info(fs_info); |
| 110 | } |
| 111 | |
| 112 | /* btrfs handle error by forcing the filesystem readonly */ |
| 113 | static void btrfs_handle_error(struct btrfs_fs_info *fs_info) |
| 114 | { |
| 115 | struct super_block *sb = fs_info->sb; |
| 116 | |
| 117 | if (sb->s_flags & MS_RDONLY) |
| 118 | return; |
| 119 | |
| 120 | if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { |
| 121 | sb->s_flags |= MS_RDONLY; |
| 122 | printk(KERN_INFO "btrfs is forced readonly\n"); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 123 | __btrfs_scrub_cancel(fs_info); |
| 124 | // WARN_ON(1); |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 125 | } |
| 126 | } |
| 127 | |
| 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; |
| 136 | char nbuf[16]; |
| 137 | const char *errstr; |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 138 | va_list args; |
| 139 | va_start(args, fmt); |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 140 | |
| 141 | /* |
| 142 | * Special case: if the error is EROFS, and we're already |
| 143 | * under MS_RDONLY, then it is safe here. |
| 144 | */ |
| 145 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 146 | return; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 147 | |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 148 | errstr = btrfs_decode_error(fs_info, errno, nbuf); |
| 149 | if (fmt) { |
| 150 | struct va_format vaf = { |
| 151 | .fmt = fmt, |
| 152 | .va = &args, |
| 153 | }; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 154 | |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 155 | printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: %s (%pV)\n", |
| 156 | sb->s_id, function, line, errstr, &vaf); |
| 157 | } else { |
| 158 | printk(KERN_CRIT "BTRFS error (device %s) in %s:%d: %s\n", |
| 159 | sb->s_id, function, line, errstr); |
| 160 | } |
| 161 | |
| 162 | /* Don't go through full error handling during mount */ |
| 163 | if (sb->s_flags & MS_BORN) { |
| 164 | save_error_info(fs_info); |
| 165 | btrfs_handle_error(fs_info); |
| 166 | } |
| 167 | va_end(args); |
| 168 | } |
| 169 | |
| 170 | const char *logtypes[] = { |
| 171 | "emergency", |
| 172 | "alert", |
| 173 | "critical", |
| 174 | "error", |
| 175 | "warning", |
| 176 | "notice", |
| 177 | "info", |
| 178 | "debug", |
| 179 | }; |
| 180 | |
| 181 | void btrfs_printk(struct btrfs_fs_info *fs_info, const char *fmt, ...) |
| 182 | { |
| 183 | struct super_block *sb = fs_info->sb; |
| 184 | char lvl[4]; |
| 185 | struct va_format vaf; |
| 186 | va_list args; |
| 187 | const char *type = logtypes[4]; |
| 188 | |
| 189 | va_start(args, fmt); |
| 190 | |
| 191 | if (fmt[0] == '<' && isdigit(fmt[1]) && fmt[2] == '>') { |
Jim Meyering | f07c9a7 | 2012-04-26 18:35:12 +0200 | [diff] [blame] | 192 | memcpy(lvl, fmt, 3); |
| 193 | lvl[3] = '\0'; |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 194 | fmt += 3; |
| 195 | type = logtypes[fmt[1] - '0']; |
| 196 | } else |
| 197 | *lvl = '\0'; |
| 198 | |
| 199 | vaf.fmt = fmt; |
| 200 | vaf.va = &args; |
| 201 | printk("%sBTRFS %s (device %s): %pV", lvl, type, sb->s_id, &vaf); |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 202 | } |
| 203 | |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 204 | /* |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 205 | * We only mark the transaction aborted and then set the file system read-only. |
| 206 | * This will prevent new transactions from starting or trying to join this |
| 207 | * one. |
| 208 | * |
| 209 | * This means that error recovery at the call site is limited to freeing |
| 210 | * any local memory allocations and passing the error code up without |
| 211 | * further cleanup. The transaction should complete as it normally would |
| 212 | * in the call path but will return -EIO. |
| 213 | * |
| 214 | * We'll complete the cleanup in btrfs_end_transaction and |
| 215 | * btrfs_commit_transaction. |
| 216 | */ |
| 217 | void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, |
| 218 | struct btrfs_root *root, const char *function, |
| 219 | unsigned int line, int errno) |
| 220 | { |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 221 | WARN_ONCE(1, KERN_DEBUG "btrfs: Transaction aborted"); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 222 | trans->aborted = errno; |
| 223 | /* Nothing used. The other threads that have joined this |
| 224 | * transaction may be able to continue. */ |
| 225 | if (!trans->blocks_used) { |
| 226 | btrfs_printk(root->fs_info, "Aborting unused transaction.\n"); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 227 | return; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 228 | } |
| 229 | trans->transaction->aborted = errno; |
| 230 | __btrfs_std_error(root->fs_info, function, line, errno, NULL); |
| 231 | } |
| 232 | /* |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 233 | * __btrfs_panic decodes unexpected, fatal errors from the caller, |
| 234 | * issues an alert, and either panics or BUGs, depending on mount options. |
| 235 | */ |
| 236 | void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, |
| 237 | unsigned int line, int errno, const char *fmt, ...) |
| 238 | { |
| 239 | char nbuf[16]; |
| 240 | char *s_id = "<unknown>"; |
| 241 | const char *errstr; |
| 242 | struct va_format vaf = { .fmt = fmt }; |
| 243 | va_list args; |
| 244 | |
| 245 | if (fs_info) |
| 246 | s_id = fs_info->sb->s_id; |
| 247 | |
| 248 | va_start(args, fmt); |
| 249 | vaf.va = &args; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 250 | |
| 251 | errstr = btrfs_decode_error(fs_info, errno, nbuf); |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 252 | if (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR) |
| 253 | panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (%s)\n", |
| 254 | s_id, function, line, &vaf, errstr); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 255 | |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 256 | printk(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (%s)\n", |
| 257 | s_id, function, line, &vaf, errstr); |
| 258 | va_end(args); |
| 259 | /* Caller calls BUG() */ |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 260 | } |
| 261 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 262 | static void btrfs_put_super(struct super_block *sb) |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 263 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 264 | (void)close_ctree(btrfs_sb(sb)->tree_root); |
Al Viro | aea52e1 | 2011-11-17 01:22:46 -0500 | [diff] [blame] | 265 | /* FIXME: need to fix VFS to return error? */ |
| 266 | /* AV: return it _where_? ->put_super() can be triggered by any number |
| 267 | * of async events, up to and including delivery of SIGKILL to the |
| 268 | * last process that kept it busy. Or segfault in the aforementioned |
| 269 | * process... Whom would you report that to? |
| 270 | */ |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 271 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 272 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 273 | enum { |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 274 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
Josef Bacik | 287a0ab | 2010-03-19 18:07:23 +0000 | [diff] [blame] | 275 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
| 276 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 277 | Opt_compress_type, Opt_compress_force, Opt_compress_force_type, |
| 278 | Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, |
Chris Mason | 9143565 | 2011-02-16 13:10:41 -0500 | [diff] [blame] | 279 | Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, |
Ilya Dryomov | 9555c6c | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 280 | Opt_enospc_debug, Opt_subvolrootid, Opt_defrag, Opt_inode_cache, |
| 281 | Opt_no_space_cache, Opt_recovery, Opt_skip_balance, |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 282 | Opt_check_integrity, Opt_check_integrity_including_extent_data, |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 283 | Opt_check_integrity_print_mask, Opt_fatal_errors, |
Ilya Dryomov | 9555c6c | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 284 | Opt_err, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 285 | }; |
| 286 | |
| 287 | static match_table_t tokens = { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 288 | {Opt_degraded, "degraded"}, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 289 | {Opt_subvol, "subvol=%s"}, |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 290 | {Opt_subvolid, "subvolid=%d"}, |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 291 | {Opt_device, "device=%s"}, |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 292 | {Opt_nodatasum, "nodatasum"}, |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 293 | {Opt_nodatacow, "nodatacow"}, |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 294 | {Opt_nobarrier, "nobarrier"}, |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 295 | {Opt_max_inline, "max_inline=%s"}, |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 296 | {Opt_alloc_start, "alloc_start=%s"}, |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 297 | {Opt_thread_pool, "thread_pool=%d"}, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 298 | {Opt_compress, "compress"}, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 299 | {Opt_compress_type, "compress=%s"}, |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 300 | {Opt_compress_force, "compress-force"}, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 301 | {Opt_compress_force_type, "compress-force=%s"}, |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 302 | {Opt_ssd, "ssd"}, |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 303 | {Opt_ssd_spread, "ssd_spread"}, |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 304 | {Opt_nossd, "nossd"}, |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 305 | {Opt_noacl, "noacl"}, |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 306 | {Opt_notreelog, "notreelog"}, |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 307 | {Opt_flushoncommit, "flushoncommit"}, |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 308 | {Opt_ratio, "metadata_ratio=%d"}, |
Christoph Hellwig | e244a0a | 2009-10-14 09:24:59 -0400 | [diff] [blame] | 309 | {Opt_discard, "discard"}, |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 310 | {Opt_space_cache, "space_cache"}, |
Josef Bacik | 88c2ba3 | 2010-09-21 14:21:34 -0400 | [diff] [blame] | 311 | {Opt_clear_cache, "clear_cache"}, |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 312 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
Chris Mason | 9143565 | 2011-02-16 13:10:41 -0500 | [diff] [blame] | 313 | {Opt_enospc_debug, "enospc_debug"}, |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 314 | {Opt_subvolrootid, "subvolrootid=%d"}, |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 315 | {Opt_defrag, "autodefrag"}, |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 316 | {Opt_inode_cache, "inode_cache"}, |
David Sterba | 8965593 | 2011-11-11 10:14:57 -0500 | [diff] [blame] | 317 | {Opt_no_space_cache, "nospace_cache"}, |
Chris Mason | af31f5e | 2011-11-03 15:17:42 -0400 | [diff] [blame] | 318 | {Opt_recovery, "recovery"}, |
Ilya Dryomov | 9555c6c | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 319 | {Opt_skip_balance, "skip_balance"}, |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 320 | {Opt_check_integrity, "check_int"}, |
| 321 | {Opt_check_integrity_including_extent_data, "check_int_data"}, |
| 322 | {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 323 | {Opt_fatal_errors, "fatal_errors=%s"}, |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 324 | {Opt_err, NULL}, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 325 | }; |
| 326 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 327 | /* |
| 328 | * Regular mount options parser. Everything that is needed only when |
| 329 | * reading in a new superblock is parsed here. |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 330 | * XXX JDM: This needs to be cleaned up for remount. |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 331 | */ |
| 332 | int btrfs_parse_options(struct btrfs_root *root, char *options) |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 333 | { |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 334 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 335 | substring_t args[MAX_OPT_ARGS]; |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 336 | char *p, *num, *orig = NULL; |
| 337 | u64 cache_gen; |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 338 | int intarg; |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 339 | int ret = 0; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 340 | char *compress_type; |
| 341 | bool compress_force = false; |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 342 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 343 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 344 | if (cache_gen) |
| 345 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
| 346 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 347 | if (!options) |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 348 | goto out; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 349 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 350 | /* |
| 351 | * strsep changes the string, duplicate it because parse_options |
| 352 | * gets called twice |
| 353 | */ |
| 354 | options = kstrdup(options, GFP_NOFS); |
| 355 | if (!options) |
| 356 | return -ENOMEM; |
| 357 | |
Josef Bacik | da495ec | 2010-02-25 20:38:35 +0000 | [diff] [blame] | 358 | orig = options; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 359 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 360 | while ((p = strsep(&options, ",")) != NULL) { |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 361 | int token; |
| 362 | if (!*p) |
| 363 | continue; |
| 364 | |
| 365 | token = match_token(p, tokens, args); |
| 366 | switch (token) { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 367 | case Opt_degraded: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 368 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
| 369 | btrfs_set_opt(info->mount_opt, DEGRADED); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 370 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 371 | case Opt_subvol: |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 372 | case Opt_subvolid: |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 373 | case Opt_subvolrootid: |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 374 | case Opt_device: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 375 | /* |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 376 | * These are parsed by btrfs_parse_early_options |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 377 | * and can be happily ignored here. |
| 378 | */ |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 379 | break; |
| 380 | case Opt_nodatasum: |
Chris Mason | 067c28a | 2009-06-11 09:30:13 -0400 | [diff] [blame] | 381 | printk(KERN_INFO "btrfs: setting nodatasum\n"); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 382 | btrfs_set_opt(info->mount_opt, NODATASUM); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 383 | break; |
| 384 | case Opt_nodatacow: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 385 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
| 386 | btrfs_set_opt(info->mount_opt, NODATACOW); |
| 387 | btrfs_set_opt(info->mount_opt, NODATASUM); |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 388 | break; |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 389 | case Opt_compress_force: |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 390 | case Opt_compress_force_type: |
| 391 | compress_force = true; |
| 392 | case Opt_compress: |
| 393 | case Opt_compress_type: |
| 394 | if (token == Opt_compress || |
| 395 | token == Opt_compress_force || |
| 396 | strcmp(args[0].from, "zlib") == 0) { |
| 397 | compress_type = "zlib"; |
| 398 | info->compress_type = BTRFS_COMPRESS_ZLIB; |
Li Zefan | a6fa6fa | 2010-10-25 15:12:26 +0800 | [diff] [blame] | 399 | } else if (strcmp(args[0].from, "lzo") == 0) { |
| 400 | compress_type = "lzo"; |
| 401 | info->compress_type = BTRFS_COMPRESS_LZO; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 402 | } else { |
| 403 | ret = -EINVAL; |
| 404 | goto out; |
| 405 | } |
| 406 | |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 407 | btrfs_set_opt(info->mount_opt, COMPRESS); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 408 | if (compress_force) { |
| 409 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); |
| 410 | pr_info("btrfs: force %s compression\n", |
| 411 | compress_type); |
| 412 | } else |
| 413 | pr_info("btrfs: use %s compression\n", |
| 414 | compress_type); |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 415 | break; |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 416 | case Opt_ssd: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 417 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
| 418 | btrfs_set_opt(info->mount_opt, SSD); |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 419 | break; |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 420 | case Opt_ssd_spread: |
| 421 | printk(KERN_INFO "btrfs: use spread ssd " |
| 422 | "allocation scheme\n"); |
| 423 | btrfs_set_opt(info->mount_opt, SSD); |
| 424 | btrfs_set_opt(info->mount_opt, SSD_SPREAD); |
| 425 | break; |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 426 | case Opt_nossd: |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 427 | printk(KERN_INFO "btrfs: not using ssd allocation " |
| 428 | "scheme\n"); |
Chris Mason | c289811 | 2009-06-10 09:51:32 -0400 | [diff] [blame] | 429 | btrfs_set_opt(info->mount_opt, NOSSD); |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 430 | btrfs_clear_opt(info->mount_opt, SSD); |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 431 | btrfs_clear_opt(info->mount_opt, SSD_SPREAD); |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 432 | break; |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 433 | case Opt_nobarrier: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 434 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
| 435 | btrfs_set_opt(info->mount_opt, NOBARRIER); |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 436 | break; |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 437 | case Opt_thread_pool: |
| 438 | intarg = 0; |
| 439 | match_int(&args[0], &intarg); |
Sergei Trofimovich | 0d2450a | 2012-04-24 22:59:16 +0300 | [diff] [blame] | 440 | if (intarg) |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 441 | info->thread_pool_size = intarg; |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 442 | break; |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 443 | case Opt_max_inline: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 444 | num = match_strdup(&args[0]); |
| 445 | if (num) { |
Akinobu Mita | 9174846 | 2010-02-28 10:59:11 +0000 | [diff] [blame] | 446 | info->max_inline = memparse(num, NULL); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 447 | kfree(num); |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 448 | |
Chris Mason | 15ada04 | 2008-06-11 16:51:38 -0400 | [diff] [blame] | 449 | if (info->max_inline) { |
| 450 | info->max_inline = max_t(u64, |
| 451 | info->max_inline, |
| 452 | root->sectorsize); |
| 453 | } |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 454 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 455 | (unsigned long long)info->max_inline); |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 456 | } |
| 457 | break; |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 458 | case Opt_alloc_start: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 459 | num = match_strdup(&args[0]); |
| 460 | if (num) { |
Akinobu Mita | 9174846 | 2010-02-28 10:59:11 +0000 | [diff] [blame] | 461 | info->alloc_start = memparse(num, NULL); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 462 | kfree(num); |
| 463 | printk(KERN_INFO |
| 464 | "btrfs: allocations start at %llu\n", |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 465 | (unsigned long long)info->alloc_start); |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 466 | } |
| 467 | break; |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 468 | case Opt_noacl: |
| 469 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; |
| 470 | break; |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 471 | case Opt_notreelog: |
| 472 | printk(KERN_INFO "btrfs: disabling tree log\n"); |
| 473 | btrfs_set_opt(info->mount_opt, NOTREELOG); |
| 474 | break; |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 475 | case Opt_flushoncommit: |
| 476 | printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); |
| 477 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); |
| 478 | break; |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 479 | case Opt_ratio: |
| 480 | intarg = 0; |
| 481 | match_int(&args[0], &intarg); |
| 482 | if (intarg) { |
| 483 | info->metadata_ratio = intarg; |
| 484 | printk(KERN_INFO "btrfs: metadata ratio %d\n", |
| 485 | info->metadata_ratio); |
| 486 | } |
| 487 | break; |
Christoph Hellwig | e244a0a | 2009-10-14 09:24:59 -0400 | [diff] [blame] | 488 | case Opt_discard: |
| 489 | btrfs_set_opt(info->mount_opt, DISCARD); |
| 490 | break; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 491 | case Opt_space_cache: |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 492 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
Josef Bacik | 0de9087 | 2010-11-19 13:40:41 +0000 | [diff] [blame] | 493 | break; |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 494 | case Opt_no_space_cache: |
| 495 | printk(KERN_INFO "btrfs: disabling disk space caching\n"); |
| 496 | btrfs_clear_opt(info->mount_opt, SPACE_CACHE); |
| 497 | break; |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 498 | case Opt_inode_cache: |
| 499 | printk(KERN_INFO "btrfs: enabling inode map caching\n"); |
| 500 | btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE); |
| 501 | break; |
Josef Bacik | 88c2ba3 | 2010-09-21 14:21:34 -0400 | [diff] [blame] | 502 | case Opt_clear_cache: |
| 503 | printk(KERN_INFO "btrfs: force clearing of disk cache\n"); |
| 504 | btrfs_set_opt(info->mount_opt, CLEAR_CACHE); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 505 | break; |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 506 | case Opt_user_subvol_rm_allowed: |
| 507 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); |
| 508 | break; |
Chris Mason | 9143565 | 2011-02-16 13:10:41 -0500 | [diff] [blame] | 509 | case Opt_enospc_debug: |
| 510 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); |
| 511 | break; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 512 | case Opt_defrag: |
| 513 | printk(KERN_INFO "btrfs: enabling auto defrag"); |
| 514 | btrfs_set_opt(info->mount_opt, AUTO_DEFRAG); |
| 515 | break; |
Chris Mason | af31f5e | 2011-11-03 15:17:42 -0400 | [diff] [blame] | 516 | case Opt_recovery: |
| 517 | printk(KERN_INFO "btrfs: enabling auto recovery"); |
| 518 | btrfs_set_opt(info->mount_opt, RECOVERY); |
| 519 | break; |
Ilya Dryomov | 9555c6c | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 520 | case Opt_skip_balance: |
| 521 | btrfs_set_opt(info->mount_opt, SKIP_BALANCE); |
| 522 | break; |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 523 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
| 524 | case Opt_check_integrity_including_extent_data: |
| 525 | printk(KERN_INFO "btrfs: enabling check integrity" |
| 526 | " including extent data\n"); |
| 527 | btrfs_set_opt(info->mount_opt, |
| 528 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); |
| 529 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
| 530 | break; |
| 531 | case Opt_check_integrity: |
| 532 | printk(KERN_INFO "btrfs: enabling check integrity\n"); |
| 533 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
| 534 | break; |
| 535 | case Opt_check_integrity_print_mask: |
| 536 | intarg = 0; |
| 537 | match_int(&args[0], &intarg); |
| 538 | if (intarg) { |
| 539 | info->check_integrity_print_mask = intarg; |
| 540 | printk(KERN_INFO "btrfs:" |
| 541 | " check_integrity_print_mask 0x%x\n", |
| 542 | info->check_integrity_print_mask); |
| 543 | } |
| 544 | break; |
| 545 | #else |
| 546 | case Opt_check_integrity_including_extent_data: |
| 547 | case Opt_check_integrity: |
| 548 | case Opt_check_integrity_print_mask: |
| 549 | printk(KERN_ERR "btrfs: support for check_integrity*" |
| 550 | " not compiled in!\n"); |
| 551 | ret = -EINVAL; |
| 552 | goto out; |
| 553 | #endif |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 554 | case Opt_fatal_errors: |
| 555 | if (strcmp(args[0].from, "panic") == 0) |
| 556 | btrfs_set_opt(info->mount_opt, |
| 557 | PANIC_ON_FATAL_ERROR); |
| 558 | else if (strcmp(args[0].from, "bug") == 0) |
| 559 | btrfs_clear_opt(info->mount_opt, |
| 560 | PANIC_ON_FATAL_ERROR); |
| 561 | else { |
| 562 | ret = -EINVAL; |
| 563 | goto out; |
| 564 | } |
| 565 | break; |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 566 | case Opt_err: |
| 567 | printk(KERN_INFO "btrfs: unrecognized mount option " |
| 568 | "'%s'\n", p); |
| 569 | ret = -EINVAL; |
| 570 | goto out; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 571 | default: |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 572 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 573 | } |
| 574 | } |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 575 | out: |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 576 | if (!ret && btrfs_test_opt(root, SPACE_CACHE)) |
| 577 | printk(KERN_INFO "btrfs: disk space caching is enabled\n"); |
Josef Bacik | da495ec | 2010-02-25 20:38:35 +0000 | [diff] [blame] | 578 | kfree(orig); |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 579 | return ret; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 580 | } |
| 581 | |
| 582 | /* |
| 583 | * Parse mount options that are required early in the mount process. |
| 584 | * |
| 585 | * All other options will be parsed on much later in the mount process and |
| 586 | * only when we need to allocate a new super block. |
| 587 | */ |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 588 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 589 | void *holder, char **subvol_name, u64 *subvol_objectid, |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 590 | u64 *subvol_rootid, struct btrfs_fs_devices **fs_devices) |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 591 | { |
| 592 | substring_t args[MAX_OPT_ARGS]; |
Jeff Liu | 83c8c9b | 2011-09-14 14:11:21 +0800 | [diff] [blame] | 593 | char *device_name, *opts, *orig, *p; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 594 | int error = 0; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 595 | int intarg; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 596 | |
| 597 | if (!options) |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 598 | return 0; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 599 | |
| 600 | /* |
| 601 | * strsep changes the string, duplicate it because parse_options |
| 602 | * gets called twice |
| 603 | */ |
| 604 | opts = kstrdup(options, GFP_KERNEL); |
| 605 | if (!opts) |
| 606 | return -ENOMEM; |
Tero Roponen | 3f3d0bc | 2010-12-27 16:43:13 +0800 | [diff] [blame] | 607 | orig = opts; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 608 | |
| 609 | while ((p = strsep(&opts, ",")) != NULL) { |
| 610 | int token; |
| 611 | if (!*p) |
| 612 | continue; |
| 613 | |
| 614 | token = match_token(p, tokens, args); |
| 615 | switch (token) { |
| 616 | case Opt_subvol: |
Ilya Dryomov | a90e8b6 | 2011-11-08 16:47:55 +0200 | [diff] [blame] | 617 | kfree(*subvol_name); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 618 | *subvol_name = match_strdup(&args[0]); |
| 619 | break; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 620 | case Opt_subvolid: |
| 621 | intarg = 0; |
Josef Bacik | 4849f01d | 2009-12-14 19:18:38 +0000 | [diff] [blame] | 622 | error = match_int(&args[0], &intarg); |
| 623 | if (!error) { |
| 624 | /* we want the original fs_tree */ |
| 625 | if (!intarg) |
| 626 | *subvol_objectid = |
| 627 | BTRFS_FS_TREE_OBJECTID; |
| 628 | else |
| 629 | *subvol_objectid = intarg; |
| 630 | } |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 631 | break; |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 632 | case Opt_subvolrootid: |
| 633 | intarg = 0; |
| 634 | error = match_int(&args[0], &intarg); |
| 635 | if (!error) { |
| 636 | /* we want the original fs_tree */ |
| 637 | if (!intarg) |
| 638 | *subvol_rootid = |
| 639 | BTRFS_FS_TREE_OBJECTID; |
| 640 | else |
| 641 | *subvol_rootid = intarg; |
| 642 | } |
| 643 | break; |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 644 | case Opt_device: |
Jeff Liu | 83c8c9b | 2011-09-14 14:11:21 +0800 | [diff] [blame] | 645 | device_name = match_strdup(&args[0]); |
| 646 | if (!device_name) { |
| 647 | error = -ENOMEM; |
| 648 | goto out; |
| 649 | } |
| 650 | error = btrfs_scan_one_device(device_name, |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 651 | flags, holder, fs_devices); |
Jeff Liu | 83c8c9b | 2011-09-14 14:11:21 +0800 | [diff] [blame] | 652 | kfree(device_name); |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 653 | if (error) |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 654 | goto out; |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 655 | break; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 656 | default: |
| 657 | break; |
| 658 | } |
| 659 | } |
| 660 | |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 661 | out: |
Tero Roponen | 3f3d0bc | 2010-12-27 16:43:13 +0800 | [diff] [blame] | 662 | kfree(orig); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 663 | return error; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 664 | } |
| 665 | |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 666 | static struct dentry *get_default_root(struct super_block *sb, |
| 667 | u64 subvol_objectid) |
| 668 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 669 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
| 670 | struct btrfs_root *root = fs_info->tree_root; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 671 | struct btrfs_root *new_root; |
| 672 | struct btrfs_dir_item *di; |
| 673 | struct btrfs_path *path; |
| 674 | struct btrfs_key location; |
| 675 | struct inode *inode; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 676 | u64 dir_id; |
| 677 | int new = 0; |
| 678 | |
| 679 | /* |
| 680 | * We have a specific subvol we want to mount, just setup location and |
| 681 | * go look up the root. |
| 682 | */ |
| 683 | if (subvol_objectid) { |
| 684 | location.objectid = subvol_objectid; |
| 685 | location.type = BTRFS_ROOT_ITEM_KEY; |
| 686 | location.offset = (u64)-1; |
| 687 | goto find_root; |
| 688 | } |
| 689 | |
| 690 | path = btrfs_alloc_path(); |
| 691 | if (!path) |
| 692 | return ERR_PTR(-ENOMEM); |
| 693 | path->leave_spinning = 1; |
| 694 | |
| 695 | /* |
| 696 | * Find the "default" dir item which points to the root item that we |
| 697 | * will mount by default if we haven't been given a specific subvolume |
| 698 | * to mount. |
| 699 | */ |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 700 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 701 | 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] | 702 | if (IS_ERR(di)) { |
| 703 | btrfs_free_path(path); |
Dan Carpenter | fb4f6f9 | 2010-05-29 09:40:57 +0000 | [diff] [blame] | 704 | return ERR_CAST(di); |
Julia Lawall | b083916 | 2011-05-14 07:10:51 +0000 | [diff] [blame] | 705 | } |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 706 | if (!di) { |
| 707 | /* |
| 708 | * Ok the default dir item isn't there. This is weird since |
| 709 | * it's always been there, but don't freak out, just try and |
| 710 | * mount to root most subvolume. |
| 711 | */ |
| 712 | btrfs_free_path(path); |
| 713 | dir_id = BTRFS_FIRST_FREE_OBJECTID; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 714 | new_root = fs_info->fs_root; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 715 | goto setup_root; |
| 716 | } |
| 717 | |
| 718 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); |
| 719 | btrfs_free_path(path); |
| 720 | |
| 721 | find_root: |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 722 | new_root = btrfs_read_fs_root_no_name(fs_info, &location); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 723 | if (IS_ERR(new_root)) |
Julia Lawall | d0b678c | 2010-10-29 15:14:23 -0400 | [diff] [blame] | 724 | return ERR_CAST(new_root); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 725 | |
| 726 | if (btrfs_root_refs(&new_root->root_item) == 0) |
| 727 | return ERR_PTR(-ENOENT); |
| 728 | |
| 729 | dir_id = btrfs_root_dirid(&new_root->root_item); |
| 730 | setup_root: |
| 731 | location.objectid = dir_id; |
| 732 | location.type = BTRFS_INODE_ITEM_KEY; |
| 733 | location.offset = 0; |
| 734 | |
| 735 | inode = btrfs_iget(sb, &location, new_root, &new); |
Dan Carpenter | 4cbd114 | 2010-05-29 09:42:19 +0000 | [diff] [blame] | 736 | if (IS_ERR(inode)) |
| 737 | return ERR_CAST(inode); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 738 | |
| 739 | /* |
| 740 | * If we're just mounting the root most subvol put the inode and return |
| 741 | * a reference to the dentry. We will have already gotten a reference |
| 742 | * to the inode in btrfs_fill_super so we're good to go. |
| 743 | */ |
| 744 | if (!new && sb->s_root->d_inode == inode) { |
| 745 | iput(inode); |
| 746 | return dget(sb->s_root); |
| 747 | } |
| 748 | |
Josef Bacik | ba5b895 | 2011-07-25 15:40:35 -0400 | [diff] [blame] | 749 | return d_obtain_alias(inode); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 750 | } |
| 751 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 752 | static int btrfs_fill_super(struct super_block *sb, |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 753 | struct btrfs_fs_devices *fs_devices, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 754 | void *data, int silent) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 755 | { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 756 | struct inode *inode; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 757 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 758 | struct btrfs_key key; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 759 | int err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 760 | |
| 761 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 762 | sb->s_magic = BTRFS_SUPER_MAGIC; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 763 | sb->s_op = &btrfs_super_ops; |
Al Viro | af53d29 | 2010-12-20 10:56:06 -0500 | [diff] [blame] | 764 | sb->s_d_op = &btrfs_dentry_operations; |
Balaji Rao | be6e8dc | 2008-07-21 02:01:56 +0530 | [diff] [blame] | 765 | sb->s_export_op = &btrfs_export_ops; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 766 | sb->s_xattr = btrfs_xattr_handlers; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 767 | sb->s_time_gran = 1; |
Chris Mason | 0eda294 | 2009-10-13 13:50:18 -0400 | [diff] [blame] | 768 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 769 | sb->s_flags |= MS_POSIXACL; |
Chris Ball | 49cf6f4 | 2009-09-29 13:51:04 -0400 | [diff] [blame] | 770 | #endif |
Josef Bacik | 0c4d2d9 | 2012-04-05 15:03:02 -0400 | [diff] [blame] | 771 | sb->s_flags |= MS_I_VERSION; |
Al Viro | ad2b2c8 | 2011-11-17 01:10:02 -0500 | [diff] [blame] | 772 | err = open_ctree(sb, fs_devices, (char *)data); |
| 773 | if (err) { |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 774 | printk("btrfs: open_ctree failed\n"); |
Al Viro | ad2b2c8 | 2011-11-17 01:10:02 -0500 | [diff] [blame] | 775 | return err; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 776 | } |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 777 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 778 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
| 779 | key.type = BTRFS_INODE_ITEM_KEY; |
| 780 | key.offset = 0; |
Al Viro | 98c7089 | 2011-11-17 01:00:31 -0500 | [diff] [blame] | 781 | inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 782 | if (IS_ERR(inode)) { |
| 783 | err = PTR_ERR(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 784 | goto fail_close; |
| 785 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 786 | |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 787 | sb->s_root = d_make_root(inode); |
| 788 | if (!sb->s_root) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 789 | err = -ENOMEM; |
| 790 | goto fail_close; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 791 | } |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 792 | |
Chris Mason | 6885f30 | 2008-02-20 16:11:05 -0500 | [diff] [blame] | 793 | save_mount_options(sb, data); |
Dan Magenheimer | 90a887c | 2011-05-26 10:01:56 -0600 | [diff] [blame] | 794 | cleancache_init_fs(sb); |
Al Viro | 59553ed | 2011-11-17 01:56:28 -0500 | [diff] [blame] | 795 | sb->s_flags |= MS_ACTIVE; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 796 | return 0; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 797 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 798 | fail_close: |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 799 | close_ctree(fs_info->tree_root); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 800 | return err; |
| 801 | } |
| 802 | |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 803 | int btrfs_sync_fs(struct super_block *sb, int wait) |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 804 | { |
| 805 | struct btrfs_trans_handle *trans; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 806 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
| 807 | struct btrfs_root *root = fs_info->tree_root; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 808 | int ret; |
Chris Mason | df2ce34 | 2007-03-23 11:00:45 -0400 | [diff] [blame] | 809 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 810 | trace_btrfs_sync_fs(wait); |
| 811 | |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 812 | if (!wait) { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 813 | filemap_flush(fs_info->btree_inode->i_mapping); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 814 | return 0; |
| 815 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 816 | |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 817 | btrfs_wait_ordered_extents(root, 0, 0); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 818 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 819 | trans = btrfs_start_transaction(root, 0); |
Tsutomu Itoh | 98d5dc1 | 2011-01-20 06:19:37 +0000 | [diff] [blame] | 820 | if (IS_ERR(trans)) |
| 821 | return PTR_ERR(trans); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 822 | ret = btrfs_commit_transaction(trans, root); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 823 | return ret; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 824 | } |
| 825 | |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 826 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 827 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 828 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
| 829 | struct btrfs_root *root = info->tree_root; |
Tsutomu Itoh | 200da64 | 2011-03-31 00:44:29 +0000 | [diff] [blame] | 830 | char *compress_type; |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 831 | |
| 832 | if (btrfs_test_opt(root, DEGRADED)) |
| 833 | seq_puts(seq, ",degraded"); |
| 834 | if (btrfs_test_opt(root, NODATASUM)) |
| 835 | seq_puts(seq, ",nodatasum"); |
| 836 | if (btrfs_test_opt(root, NODATACOW)) |
| 837 | seq_puts(seq, ",nodatacow"); |
| 838 | if (btrfs_test_opt(root, NOBARRIER)) |
| 839 | seq_puts(seq, ",nobarrier"); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 840 | if (info->max_inline != 8192 * 1024) |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 841 | seq_printf(seq, ",max_inline=%llu", |
| 842 | (unsigned long long)info->max_inline); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 843 | if (info->alloc_start != 0) |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 844 | seq_printf(seq, ",alloc_start=%llu", |
| 845 | (unsigned long long)info->alloc_start); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 846 | if (info->thread_pool_size != min_t(unsigned long, |
| 847 | num_online_cpus() + 2, 8)) |
| 848 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); |
Tsutomu Itoh | 200da64 | 2011-03-31 00:44:29 +0000 | [diff] [blame] | 849 | if (btrfs_test_opt(root, COMPRESS)) { |
| 850 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) |
| 851 | compress_type = "zlib"; |
| 852 | else |
| 853 | compress_type = "lzo"; |
| 854 | if (btrfs_test_opt(root, FORCE_COMPRESS)) |
| 855 | seq_printf(seq, ",compress-force=%s", compress_type); |
| 856 | else |
| 857 | seq_printf(seq, ",compress=%s", compress_type); |
| 858 | } |
Chris Mason | c289811 | 2009-06-10 09:51:32 -0400 | [diff] [blame] | 859 | if (btrfs_test_opt(root, NOSSD)) |
| 860 | seq_puts(seq, ",nossd"); |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 861 | if (btrfs_test_opt(root, SSD_SPREAD)) |
| 862 | seq_puts(seq, ",ssd_spread"); |
| 863 | else if (btrfs_test_opt(root, SSD)) |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 864 | seq_puts(seq, ",ssd"); |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 865 | if (btrfs_test_opt(root, NOTREELOG)) |
Sage Weil | 6b65c5c | 2009-05-14 13:52:21 -0400 | [diff] [blame] | 866 | seq_puts(seq, ",notreelog"); |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 867 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
Sage Weil | 6b65c5c | 2009-05-14 13:52:21 -0400 | [diff] [blame] | 868 | seq_puts(seq, ",flushoncommit"); |
Matthew Wilcox | 20a5239 | 2009-12-14 22:01:12 +0000 | [diff] [blame] | 869 | if (btrfs_test_opt(root, DISCARD)) |
| 870 | seq_puts(seq, ",discard"); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 871 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
| 872 | seq_puts(seq, ",noacl"); |
Tsutomu Itoh | 200da64 | 2011-03-31 00:44:29 +0000 | [diff] [blame] | 873 | if (btrfs_test_opt(root, SPACE_CACHE)) |
| 874 | seq_puts(seq, ",space_cache"); |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 875 | else |
David Sterba | 8965593 | 2011-11-11 10:14:57 -0500 | [diff] [blame] | 876 | seq_puts(seq, ",nospace_cache"); |
Tsutomu Itoh | 200da64 | 2011-03-31 00:44:29 +0000 | [diff] [blame] | 877 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
| 878 | seq_puts(seq, ",clear_cache"); |
| 879 | if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) |
| 880 | seq_puts(seq, ",user_subvol_rm_allowed"); |
David Sterba | 0942caa | 2011-06-28 15:10:37 +0000 | [diff] [blame] | 881 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) |
| 882 | seq_puts(seq, ",enospc_debug"); |
| 883 | if (btrfs_test_opt(root, AUTO_DEFRAG)) |
| 884 | seq_puts(seq, ",autodefrag"); |
| 885 | if (btrfs_test_opt(root, INODE_MAP_CACHE)) |
| 886 | seq_puts(seq, ",inode_cache"); |
Ilya Dryomov | 9555c6c | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 887 | if (btrfs_test_opt(root, SKIP_BALANCE)) |
| 888 | seq_puts(seq, ",skip_balance"); |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 889 | if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) |
| 890 | seq_puts(seq, ",fatal_errors=panic"); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 891 | return 0; |
| 892 | } |
| 893 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 894 | static int btrfs_test_super(struct super_block *s, void *data) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 895 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 896 | struct btrfs_fs_info *p = data; |
| 897 | struct btrfs_fs_info *fs_info = btrfs_sb(s); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 898 | |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 899 | return fs_info->fs_devices == p->fs_devices; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 900 | } |
| 901 | |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 902 | static int btrfs_set_super(struct super_block *s, void *data) |
| 903 | { |
Al Viro | 6de1d09 | 2011-11-17 01:29:09 -0500 | [diff] [blame] | 904 | int err = set_anon_super(s, data); |
| 905 | if (!err) |
| 906 | s->s_fs_info = data; |
| 907 | return err; |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 908 | } |
| 909 | |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 910 | /* |
David Sterba | f9d9ef6 | 2011-09-29 13:11:33 +0200 | [diff] [blame] | 911 | * subvolumes are identified by ino 256 |
| 912 | */ |
| 913 | static inline int is_subvolume_inode(struct inode *inode) |
| 914 | { |
| 915 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) |
| 916 | return 1; |
| 917 | return 0; |
| 918 | } |
| 919 | |
| 920 | /* |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 921 | * This will strip out the subvol=%s argument for an argument string and add |
| 922 | * subvolid=0 to make sure we get the actual tree root for path walking to the |
| 923 | * subvol we want. |
| 924 | */ |
| 925 | static char *setup_root_args(char *args) |
| 926 | { |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 927 | unsigned len = strlen(args) + 2 + 1; |
| 928 | char *src, *dst, *buf; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 929 | |
| 930 | /* |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 931 | * We need the same args as before, but with this substitution: |
| 932 | * s!subvol=[^,]+!subvolid=0! |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 933 | * |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 934 | * Since the replacement string is up to 2 bytes longer than the |
| 935 | * original, allocate strlen(args) + 2 + 1 bytes. |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 936 | */ |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 937 | |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 938 | src = strstr(args, "subvol="); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 939 | /* This shouldn't happen, but just in case.. */ |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 940 | if (!src) |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 941 | return NULL; |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 942 | |
| 943 | buf = dst = kmalloc(len, GFP_NOFS); |
| 944 | if (!buf) |
| 945 | return NULL; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 946 | |
| 947 | /* |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 948 | * If the subvol= arg is not at the start of the string, |
| 949 | * copy whatever precedes it into buf. |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 950 | */ |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 951 | if (src != args) { |
| 952 | *src++ = '\0'; |
| 953 | strcpy(buf, args); |
| 954 | dst += strlen(args); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 955 | } |
| 956 | |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 957 | strcpy(dst, "subvolid=0"); |
| 958 | dst += strlen("subvolid=0"); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 959 | |
| 960 | /* |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 961 | * If there is a "," after the original subvol=... string, |
| 962 | * copy that suffix into our buffer. Otherwise, we're done. |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 963 | */ |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 964 | src = strchr(src, ','); |
| 965 | if (src) |
| 966 | strcpy(dst, src); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 967 | |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 968 | return buf; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 969 | } |
| 970 | |
| 971 | static struct dentry *mount_subvol(const char *subvol_name, int flags, |
| 972 | const char *device_name, char *data) |
| 973 | { |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 974 | struct dentry *root; |
| 975 | struct vfsmount *mnt; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 976 | char *newargs; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 977 | |
| 978 | newargs = setup_root_args(data); |
| 979 | if (!newargs) |
| 980 | return ERR_PTR(-ENOMEM); |
| 981 | mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, |
| 982 | newargs); |
| 983 | kfree(newargs); |
| 984 | if (IS_ERR(mnt)) |
| 985 | return ERR_CAST(mnt); |
| 986 | |
Al Viro | ea441d1 | 2011-11-16 21:43:59 -0500 | [diff] [blame] | 987 | root = mount_subtree(mnt, subvol_name); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 988 | |
Al Viro | ea441d1 | 2011-11-16 21:43:59 -0500 | [diff] [blame] | 989 | if (!IS_ERR(root) && !is_subvolume_inode(root->d_inode)) { |
| 990 | struct super_block *s = root->d_sb; |
| 991 | dput(root); |
| 992 | root = ERR_PTR(-EINVAL); |
| 993 | deactivate_locked_super(s); |
David Sterba | f9d9ef6 | 2011-09-29 13:11:33 +0200 | [diff] [blame] | 994 | printk(KERN_ERR "btrfs: '%s' is not a valid subvolume\n", |
| 995 | subvol_name); |
David Sterba | f9d9ef6 | 2011-09-29 13:11:33 +0200 | [diff] [blame] | 996 | } |
| 997 | |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 998 | return root; |
| 999 | } |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1000 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 1001 | /* |
| 1002 | * Find a superblock for the given device / mount point. |
| 1003 | * |
| 1004 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions |
| 1005 | * for multiple device setup. Make sure to keep it in sync. |
| 1006 | */ |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 1007 | 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] | 1008 | const char *device_name, void *data) |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1009 | { |
| 1010 | struct block_device *bdev = NULL; |
| 1011 | struct super_block *s; |
| 1012 | struct dentry *root; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1013 | struct btrfs_fs_devices *fs_devices = NULL; |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1014 | struct btrfs_fs_info *fs_info = NULL; |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 1015 | fmode_t mode = FMODE_READ; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 1016 | char *subvol_name = NULL; |
| 1017 | u64 subvol_objectid = 0; |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 1018 | u64 subvol_rootid = 0; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1019 | int error = 0; |
| 1020 | |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 1021 | if (!(flags & MS_RDONLY)) |
| 1022 | mode |= FMODE_WRITE; |
| 1023 | |
| 1024 | error = btrfs_parse_early_options(data, mode, fs_type, |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 1025 | &subvol_name, &subvol_objectid, |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 1026 | &subvol_rootid, &fs_devices); |
Ilya Dryomov | f23c8af | 2011-11-08 19:15:05 +0200 | [diff] [blame] | 1027 | if (error) { |
| 1028 | kfree(subvol_name); |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 1029 | return ERR_PTR(error); |
Ilya Dryomov | f23c8af | 2011-11-08 19:15:05 +0200 | [diff] [blame] | 1030 | } |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 1031 | |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1032 | if (subvol_name) { |
| 1033 | root = mount_subvol(subvol_name, flags, device_name, data); |
| 1034 | kfree(subvol_name); |
| 1035 | return root; |
| 1036 | } |
| 1037 | |
David Sterba | 306e16c | 2011-04-19 14:29:38 +0200 | [diff] [blame] | 1038 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1039 | if (error) |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1040 | return ERR_PTR(error); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1041 | |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1042 | /* |
| 1043 | * Setup a dummy root and fs_info for test/set super. This is because |
| 1044 | * we don't actually fill this stuff out until open_ctree, but we need |
| 1045 | * it for searching for existing supers, so this lets us do that and |
| 1046 | * then open_ctree will properly initialize everything later. |
| 1047 | */ |
| 1048 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); |
Ilya Dryomov | 04d21a2 | 2011-11-09 14:41:22 +0200 | [diff] [blame] | 1049 | if (!fs_info) |
| 1050 | return ERR_PTR(-ENOMEM); |
| 1051 | |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1052 | fs_info->fs_devices = fs_devices; |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1053 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1054 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
| 1055 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
| 1056 | if (!fs_info->super_copy || !fs_info->super_for_commit) { |
| 1057 | error = -ENOMEM; |
Ilya Dryomov | 04d21a2 | 2011-11-09 14:41:22 +0200 | [diff] [blame] | 1058 | goto error_fs_info; |
| 1059 | } |
| 1060 | |
| 1061 | error = btrfs_open_devices(fs_devices, mode, fs_type); |
| 1062 | if (error) |
| 1063 | goto error_fs_info; |
| 1064 | |
| 1065 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { |
| 1066 | error = -EACCES; |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1067 | goto error_close_devices; |
| 1068 | } |
| 1069 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1070 | bdev = fs_devices->latest_bdev; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1071 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, fs_info); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1072 | if (IS_ERR(s)) { |
| 1073 | error = PTR_ERR(s); |
| 1074 | goto error_close_devices; |
| 1075 | } |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1076 | |
| 1077 | if (s->s_root) { |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1078 | btrfs_close_devices(fs_devices); |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1079 | free_fs_info(fs_info); |
Al Viro | 59553ed | 2011-11-17 01:56:28 -0500 | [diff] [blame] | 1080 | if ((flags ^ s->s_flags) & MS_RDONLY) |
| 1081 | error = -EBUSY; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1082 | } else { |
| 1083 | char b[BDEVNAME_SIZE]; |
| 1084 | |
Al Viro | 9e1f1de | 2011-06-03 18:24:58 -0400 | [diff] [blame] | 1085 | s->s_flags = flags | MS_NOSEC; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1086 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1087 | btrfs_sb(s)->bdev_holder = fs_type; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1088 | error = btrfs_fill_super(s, fs_devices, data, |
| 1089 | flags & MS_SILENT ? 1 : 0); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1090 | } |
| 1091 | |
Al Viro | 59553ed | 2011-11-17 01:56:28 -0500 | [diff] [blame] | 1092 | root = !error ? get_default_root(s, subvol_objectid) : ERR_PTR(error); |
| 1093 | if (IS_ERR(root)) |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1094 | deactivate_locked_super(s); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1095 | |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 1096 | return root; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1097 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1098 | error_close_devices: |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1099 | btrfs_close_devices(fs_devices); |
Ilya Dryomov | 04d21a2 | 2011-11-09 14:41:22 +0200 | [diff] [blame] | 1100 | error_fs_info: |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1101 | free_fs_info(fs_info); |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 1102 | return ERR_PTR(error); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1103 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1104 | |
Sergei Trofimovich | 0d2450a | 2012-04-24 22:59:16 +0300 | [diff] [blame] | 1105 | static void btrfs_set_max_workers(struct btrfs_workers *workers, int new_limit) |
| 1106 | { |
| 1107 | spin_lock_irq(&workers->lock); |
| 1108 | workers->max_workers = new_limit; |
| 1109 | spin_unlock_irq(&workers->lock); |
| 1110 | } |
| 1111 | |
| 1112 | static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, |
| 1113 | int new_pool_size, int old_pool_size) |
| 1114 | { |
| 1115 | if (new_pool_size == old_pool_size) |
| 1116 | return; |
| 1117 | |
| 1118 | fs_info->thread_pool_size = new_pool_size; |
| 1119 | |
| 1120 | printk(KERN_INFO "btrfs: resize thread pool %d -> %d\n", |
| 1121 | old_pool_size, new_pool_size); |
| 1122 | |
| 1123 | btrfs_set_max_workers(&fs_info->generic_worker, new_pool_size); |
| 1124 | btrfs_set_max_workers(&fs_info->workers, new_pool_size); |
| 1125 | btrfs_set_max_workers(&fs_info->delalloc_workers, new_pool_size); |
| 1126 | btrfs_set_max_workers(&fs_info->submit_workers, new_pool_size); |
| 1127 | btrfs_set_max_workers(&fs_info->caching_workers, new_pool_size); |
| 1128 | btrfs_set_max_workers(&fs_info->fixup_workers, new_pool_size); |
| 1129 | btrfs_set_max_workers(&fs_info->endio_workers, new_pool_size); |
| 1130 | btrfs_set_max_workers(&fs_info->endio_meta_workers, new_pool_size); |
| 1131 | btrfs_set_max_workers(&fs_info->endio_meta_write_workers, new_pool_size); |
| 1132 | btrfs_set_max_workers(&fs_info->endio_write_workers, new_pool_size); |
| 1133 | btrfs_set_max_workers(&fs_info->endio_freespace_worker, new_pool_size); |
| 1134 | btrfs_set_max_workers(&fs_info->delayed_workers, new_pool_size); |
| 1135 | btrfs_set_max_workers(&fs_info->readahead_workers, new_pool_size); |
| 1136 | btrfs_set_max_workers(&fs_info->scrub_workers, new_pool_size); |
| 1137 | } |
| 1138 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1139 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
| 1140 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1141 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
| 1142 | struct btrfs_root *root = fs_info->tree_root; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1143 | unsigned old_flags = sb->s_flags; |
| 1144 | unsigned long old_opts = fs_info->mount_opt; |
| 1145 | unsigned long old_compress_type = fs_info->compress_type; |
| 1146 | u64 old_max_inline = fs_info->max_inline; |
| 1147 | u64 old_alloc_start = fs_info->alloc_start; |
| 1148 | int old_thread_pool_size = fs_info->thread_pool_size; |
| 1149 | unsigned int old_metadata_ratio = fs_info->metadata_ratio; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1150 | int ret; |
| 1151 | |
Chris Mason | b288052 | 2009-02-12 09:37:35 -0500 | [diff] [blame] | 1152 | ret = btrfs_parse_options(root, data); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1153 | if (ret) { |
| 1154 | ret = -EINVAL; |
| 1155 | goto restore; |
| 1156 | } |
Chris Mason | b288052 | 2009-02-12 09:37:35 -0500 | [diff] [blame] | 1157 | |
Sergei Trofimovich | 0d2450a | 2012-04-24 22:59:16 +0300 | [diff] [blame] | 1158 | btrfs_resize_thread_pool(fs_info, |
| 1159 | fs_info->thread_pool_size, old_thread_pool_size); |
| 1160 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1161 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 1162 | return 0; |
| 1163 | |
| 1164 | if (*flags & MS_RDONLY) { |
| 1165 | sb->s_flags |= MS_RDONLY; |
| 1166 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1167 | ret = btrfs_commit_super(root); |
| 1168 | if (ret) |
| 1169 | goto restore; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1170 | } else { |
Sergei Trofimovich | 8a3db18 | 2012-04-16 06:44:37 +0300 | [diff] [blame] | 1171 | if (fs_info->fs_devices->rw_devices == 0) { |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1172 | ret = -EACCES; |
| 1173 | goto restore; |
Sergei Trofimovich | 8a3db18 | 2012-04-16 06:44:37 +0300 | [diff] [blame] | 1174 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1175 | |
Sergei Trofimovich | 8a3db18 | 2012-04-16 06:44:37 +0300 | [diff] [blame] | 1176 | if (btrfs_super_log_root(fs_info->super_copy) != 0) { |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1177 | ret = -EINVAL; |
| 1178 | goto restore; |
Sergei Trofimovich | 8a3db18 | 2012-04-16 06:44:37 +0300 | [diff] [blame] | 1179 | } |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1180 | |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1181 | ret = btrfs_cleanup_fs_roots(fs_info); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1182 | if (ret) |
| 1183 | goto restore; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1184 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1185 | /* recover relocation */ |
| 1186 | ret = btrfs_recover_relocation(root); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1187 | if (ret) |
| 1188 | goto restore; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1189 | |
Ilya Dryomov | 2b6ba62 | 2012-06-22 12:24:13 -0600 | [diff] [blame] | 1190 | ret = btrfs_resume_balance_async(fs_info); |
| 1191 | if (ret) |
| 1192 | goto restore; |
| 1193 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1194 | sb->s_flags &= ~MS_RDONLY; |
| 1195 | } |
| 1196 | |
| 1197 | return 0; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1198 | |
| 1199 | restore: |
| 1200 | /* We've hit an error - don't reset MS_RDONLY */ |
| 1201 | if (sb->s_flags & MS_RDONLY) |
| 1202 | old_flags |= MS_RDONLY; |
| 1203 | sb->s_flags = old_flags; |
| 1204 | fs_info->mount_opt = old_opts; |
| 1205 | fs_info->compress_type = old_compress_type; |
| 1206 | fs_info->max_inline = old_max_inline; |
| 1207 | fs_info->alloc_start = old_alloc_start; |
Sergei Trofimovich | 0d2450a | 2012-04-24 22:59:16 +0300 | [diff] [blame] | 1208 | btrfs_resize_thread_pool(fs_info, |
| 1209 | old_thread_pool_size, fs_info->thread_pool_size); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1210 | fs_info->metadata_ratio = old_metadata_ratio; |
| 1211 | return ret; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1212 | } |
| 1213 | |
Arne Jansen | bcd5374 | 2011-04-12 10:43:21 +0200 | [diff] [blame] | 1214 | /* Used to sort the devices by max_avail(descending sort) */ |
| 1215 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, |
| 1216 | const void *dev_info2) |
| 1217 | { |
| 1218 | if (((struct btrfs_device_info *)dev_info1)->max_avail > |
| 1219 | ((struct btrfs_device_info *)dev_info2)->max_avail) |
| 1220 | return -1; |
| 1221 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < |
| 1222 | ((struct btrfs_device_info *)dev_info2)->max_avail) |
| 1223 | return 1; |
| 1224 | else |
| 1225 | return 0; |
| 1226 | } |
| 1227 | |
| 1228 | /* |
| 1229 | * sort the devices by max_avail, in which max free extent size of each device |
| 1230 | * is stored.(Descending Sort) |
| 1231 | */ |
| 1232 | static inline void btrfs_descending_sort_devices( |
| 1233 | struct btrfs_device_info *devices, |
| 1234 | size_t nr_devices) |
| 1235 | { |
| 1236 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), |
| 1237 | btrfs_cmp_device_free_bytes, NULL); |
| 1238 | } |
| 1239 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1240 | /* |
| 1241 | * The helper to calc the free space on the devices that can be used to store |
| 1242 | * file data. |
| 1243 | */ |
| 1244 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) |
| 1245 | { |
| 1246 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1247 | struct btrfs_device_info *devices_info; |
| 1248 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
| 1249 | struct btrfs_device *device; |
| 1250 | u64 skip_space; |
| 1251 | u64 type; |
| 1252 | u64 avail_space; |
| 1253 | u64 used_space; |
| 1254 | u64 min_stripe_size; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1255 | int min_stripes = 1, num_stripes = 1; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1256 | int i = 0, nr_devices; |
| 1257 | int ret; |
| 1258 | |
Li Zefan | b772a86 | 2011-11-28 16:43:00 +0800 | [diff] [blame] | 1259 | nr_devices = fs_info->fs_devices->open_devices; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1260 | BUG_ON(!nr_devices); |
| 1261 | |
| 1262 | devices_info = kmalloc(sizeof(*devices_info) * nr_devices, |
| 1263 | GFP_NOFS); |
| 1264 | if (!devices_info) |
| 1265 | return -ENOMEM; |
| 1266 | |
| 1267 | /* calc min stripe number for data space alloction */ |
| 1268 | type = btrfs_get_alloc_profile(root, 1); |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1269 | if (type & BTRFS_BLOCK_GROUP_RAID0) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1270 | min_stripes = 2; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1271 | num_stripes = nr_devices; |
| 1272 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1273 | min_stripes = 2; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1274 | num_stripes = 2; |
| 1275 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1276 | min_stripes = 4; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1277 | num_stripes = 4; |
| 1278 | } |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1279 | |
| 1280 | if (type & BTRFS_BLOCK_GROUP_DUP) |
| 1281 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; |
| 1282 | else |
| 1283 | min_stripe_size = BTRFS_STRIPE_LEN; |
| 1284 | |
Li Zefan | b772a86 | 2011-11-28 16:43:00 +0800 | [diff] [blame] | 1285 | list_for_each_entry(device, &fs_devices->devices, dev_list) { |
| 1286 | if (!device->in_fs_metadata || !device->bdev) |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1287 | continue; |
| 1288 | |
| 1289 | avail_space = device->total_bytes - device->bytes_used; |
| 1290 | |
| 1291 | /* align with stripe_len */ |
| 1292 | do_div(avail_space, BTRFS_STRIPE_LEN); |
| 1293 | avail_space *= BTRFS_STRIPE_LEN; |
| 1294 | |
| 1295 | /* |
| 1296 | * In order to avoid overwritting the superblock on the drive, |
| 1297 | * btrfs starts at an offset of at least 1MB when doing chunk |
| 1298 | * allocation. |
| 1299 | */ |
| 1300 | skip_space = 1024 * 1024; |
| 1301 | |
| 1302 | /* user can set the offset in fs_info->alloc_start. */ |
| 1303 | if (fs_info->alloc_start + BTRFS_STRIPE_LEN <= |
| 1304 | device->total_bytes) |
| 1305 | skip_space = max(fs_info->alloc_start, skip_space); |
| 1306 | |
| 1307 | /* |
| 1308 | * btrfs can not use the free space in [0, skip_space - 1], |
| 1309 | * we must subtract it from the total. In order to implement |
| 1310 | * it, we account the used space in this range first. |
| 1311 | */ |
| 1312 | ret = btrfs_account_dev_extents_size(device, 0, skip_space - 1, |
| 1313 | &used_space); |
| 1314 | if (ret) { |
| 1315 | kfree(devices_info); |
| 1316 | return ret; |
| 1317 | } |
| 1318 | |
| 1319 | /* calc the free space in [0, skip_space - 1] */ |
| 1320 | skip_space -= used_space; |
| 1321 | |
| 1322 | /* |
| 1323 | * we can use the free space in [0, skip_space - 1], subtract |
| 1324 | * it from the total. |
| 1325 | */ |
| 1326 | if (avail_space && avail_space >= skip_space) |
| 1327 | avail_space -= skip_space; |
| 1328 | else |
| 1329 | avail_space = 0; |
| 1330 | |
| 1331 | if (avail_space < min_stripe_size) |
| 1332 | continue; |
| 1333 | |
| 1334 | devices_info[i].dev = device; |
| 1335 | devices_info[i].max_avail = avail_space; |
| 1336 | |
| 1337 | i++; |
| 1338 | } |
| 1339 | |
| 1340 | nr_devices = i; |
| 1341 | |
| 1342 | btrfs_descending_sort_devices(devices_info, nr_devices); |
| 1343 | |
| 1344 | i = nr_devices - 1; |
| 1345 | avail_space = 0; |
| 1346 | while (nr_devices >= min_stripes) { |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1347 | if (num_stripes > nr_devices) |
| 1348 | num_stripes = nr_devices; |
| 1349 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1350 | if (devices_info[i].max_avail >= min_stripe_size) { |
| 1351 | int j; |
| 1352 | u64 alloc_size; |
| 1353 | |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1354 | avail_space += devices_info[i].max_avail * num_stripes; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1355 | alloc_size = devices_info[i].max_avail; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1356 | for (j = i + 1 - num_stripes; j <= i; j++) |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1357 | devices_info[j].max_avail -= alloc_size; |
| 1358 | } |
| 1359 | i--; |
| 1360 | nr_devices--; |
| 1361 | } |
| 1362 | |
| 1363 | kfree(devices_info); |
| 1364 | *free_bytes = avail_space; |
| 1365 | return 0; |
| 1366 | } |
| 1367 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1368 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 1369 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1370 | struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); |
| 1371 | struct btrfs_super_block *disk_super = fs_info->super_copy; |
| 1372 | struct list_head *head = &fs_info->space_info; |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 1373 | struct btrfs_space_info *found; |
| 1374 | u64 total_used = 0; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1375 | u64 total_free_data = 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1376 | int bits = dentry->d_sb->s_blocksize_bits; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1377 | __be32 *fsid = (__be32 *)fs_info->fsid; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1378 | int ret; |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1379 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1380 | /* holding chunk_muext to avoid allocating new chunks */ |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1381 | mutex_lock(&fs_info->chunk_mutex); |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 1382 | rcu_read_lock(); |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 1383 | list_for_each_entry_rcu(found, head, list) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1384 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
| 1385 | total_free_data += found->disk_total - found->disk_used; |
| 1386 | total_free_data -= |
| 1387 | btrfs_account_ro_block_groups_free_space(found); |
| 1388 | } |
| 1389 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 1390 | total_used += found->disk_used; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 1391 | } |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 1392 | rcu_read_unlock(); |
| 1393 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1394 | buf->f_namelen = BTRFS_NAME_LEN; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1395 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 1396 | buf->f_bfree = buf->f_blocks - (total_used >> bits); |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1397 | buf->f_bsize = dentry->d_sb->s_blocksize; |
| 1398 | buf->f_type = BTRFS_SUPER_MAGIC; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1399 | buf->f_bavail = total_free_data; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1400 | 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] | 1401 | if (ret) { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1402 | mutex_unlock(&fs_info->chunk_mutex); |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1403 | return ret; |
| 1404 | } |
| 1405 | buf->f_bavail += total_free_data; |
| 1406 | buf->f_bavail = buf->f_bavail >> bits; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1407 | mutex_unlock(&fs_info->chunk_mutex); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1408 | |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 1409 | /* We treat it as constant endianness (it doesn't matter _which_) |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1410 | because we want the fsid to come out the same whether mounted |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 1411 | on a big-endian or little-endian host */ |
| 1412 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); |
| 1413 | 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] | 1414 | /* Mask in the root object ID too, to disambiguate subvols */ |
| 1415 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; |
| 1416 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; |
| 1417 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1418 | return 0; |
| 1419 | } |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 1420 | |
Al Viro | aea52e1 | 2011-11-17 01:22:46 -0500 | [diff] [blame] | 1421 | static void btrfs_kill_super(struct super_block *sb) |
| 1422 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1423 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
Al Viro | aea52e1 | 2011-11-17 01:22:46 -0500 | [diff] [blame] | 1424 | kill_anon_super(sb); |
Al Viro | d22ca7d | 2011-11-17 01:46:50 -0500 | [diff] [blame] | 1425 | free_fs_info(fs_info); |
Al Viro | aea52e1 | 2011-11-17 01:22:46 -0500 | [diff] [blame] | 1426 | } |
| 1427 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1428 | static struct file_system_type btrfs_fs_type = { |
| 1429 | .owner = THIS_MODULE, |
| 1430 | .name = "btrfs", |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 1431 | .mount = btrfs_mount, |
Al Viro | aea52e1 | 2011-11-17 01:22:46 -0500 | [diff] [blame] | 1432 | .kill_sb = btrfs_kill_super, |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1433 | .fs_flags = FS_REQUIRES_DEV, |
| 1434 | }; |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1435 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1436 | /* |
| 1437 | * used by btrfsctl to scan devices when no FS is mounted |
| 1438 | */ |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1439 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
| 1440 | unsigned long arg) |
| 1441 | { |
| 1442 | struct btrfs_ioctl_vol_args *vol; |
| 1443 | struct btrfs_fs_devices *fs_devices; |
Chris Mason | c071fcf | 2009-01-16 11:59:08 -0500 | [diff] [blame] | 1444 | int ret = -ENOTTY; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1445 | |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 1446 | if (!capable(CAP_SYS_ADMIN)) |
| 1447 | return -EPERM; |
| 1448 | |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 1449 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
| 1450 | if (IS_ERR(vol)) |
| 1451 | return PTR_ERR(vol); |
Chris Mason | c071fcf | 2009-01-16 11:59:08 -0500 | [diff] [blame] | 1452 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1453 | switch (cmd) { |
| 1454 | case BTRFS_IOC_SCAN_DEV: |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 1455 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1456 | &btrfs_fs_type, &fs_devices); |
| 1457 | break; |
| 1458 | } |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 1459 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1460 | kfree(vol); |
Linda Knippers | f819d83 | 2008-06-09 22:17:11 -0400 | [diff] [blame] | 1461 | return ret; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1462 | } |
| 1463 | |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1464 | static int btrfs_freeze(struct super_block *sb) |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1465 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1466 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
| 1467 | mutex_lock(&fs_info->transaction_kthread_mutex); |
| 1468 | mutex_lock(&fs_info->cleaner_mutex); |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1469 | return 0; |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1470 | } |
| 1471 | |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1472 | static int btrfs_unfreeze(struct super_block *sb) |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1473 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1474 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
| 1475 | mutex_unlock(&fs_info->cleaner_mutex); |
| 1476 | mutex_unlock(&fs_info->transaction_kthread_mutex); |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1477 | return 0; |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 1478 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1479 | |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 1480 | static void btrfs_fs_dirty_inode(struct inode *inode, int flags) |
| 1481 | { |
| 1482 | int ret; |
| 1483 | |
| 1484 | ret = btrfs_dirty_inode(inode); |
| 1485 | if (ret) |
| 1486 | printk_ratelimited(KERN_ERR "btrfs: fail to dirty inode %Lu " |
| 1487 | "error %d\n", btrfs_ino(inode), ret); |
| 1488 | } |
| 1489 | |
Josef Bacik | 9c5085c | 2012-06-05 14:13:12 -0400 | [diff] [blame] | 1490 | static int btrfs_show_devname(struct seq_file *m, struct dentry *root) |
| 1491 | { |
| 1492 | struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); |
| 1493 | struct btrfs_fs_devices *cur_devices; |
| 1494 | struct btrfs_device *dev, *first_dev = NULL; |
| 1495 | struct list_head *head; |
| 1496 | struct rcu_string *name; |
| 1497 | |
| 1498 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
| 1499 | cur_devices = fs_info->fs_devices; |
| 1500 | while (cur_devices) { |
| 1501 | head = &cur_devices->devices; |
| 1502 | list_for_each_entry(dev, head, dev_list) { |
| 1503 | if (!first_dev || dev->devid < first_dev->devid) |
| 1504 | first_dev = dev; |
| 1505 | } |
| 1506 | cur_devices = cur_devices->seed; |
| 1507 | } |
| 1508 | |
| 1509 | if (first_dev) { |
| 1510 | rcu_read_lock(); |
| 1511 | name = rcu_dereference(first_dev->name); |
| 1512 | seq_escape(m, name->str, " \t\n\\"); |
| 1513 | rcu_read_unlock(); |
| 1514 | } else { |
| 1515 | WARN_ON(1); |
| 1516 | } |
| 1517 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 1518 | return 0; |
| 1519 | } |
| 1520 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 1521 | static const struct super_operations btrfs_super_ops = { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 1522 | .drop_inode = btrfs_drop_inode, |
Al Viro | bd55597 | 2010-06-07 11:35:40 -0400 | [diff] [blame] | 1523 | .evict_inode = btrfs_evict_inode, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1524 | .put_super = btrfs_put_super, |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1525 | .sync_fs = btrfs_sync_fs, |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 1526 | .show_options = btrfs_show_options, |
Josef Bacik | 9c5085c | 2012-06-05 14:13:12 -0400 | [diff] [blame] | 1527 | .show_devname = btrfs_show_devname, |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 1528 | .write_inode = btrfs_write_inode, |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 1529 | .dirty_inode = btrfs_fs_dirty_inode, |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1530 | .alloc_inode = btrfs_alloc_inode, |
| 1531 | .destroy_inode = btrfs_destroy_inode, |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 1532 | .statfs = btrfs_statfs, |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1533 | .remount_fs = btrfs_remount, |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 1534 | .freeze_fs = btrfs_freeze, |
| 1535 | .unfreeze_fs = btrfs_unfreeze, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1536 | }; |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1537 | |
| 1538 | static const struct file_operations btrfs_ctl_fops = { |
| 1539 | .unlocked_ioctl = btrfs_control_ioctl, |
| 1540 | .compat_ioctl = btrfs_control_ioctl, |
| 1541 | .owner = THIS_MODULE, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1542 | .llseek = noop_llseek, |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1543 | }; |
| 1544 | |
| 1545 | static struct miscdevice btrfs_misc = { |
Kay Sievers | 578454f | 2010-05-20 18:07:20 +0200 | [diff] [blame] | 1546 | .minor = BTRFS_MINOR, |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1547 | .name = "btrfs-control", |
| 1548 | .fops = &btrfs_ctl_fops |
| 1549 | }; |
| 1550 | |
Kay Sievers | 578454f | 2010-05-20 18:07:20 +0200 | [diff] [blame] | 1551 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
| 1552 | MODULE_ALIAS("devname:btrfs-control"); |
| 1553 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1554 | static int btrfs_interface_init(void) |
| 1555 | { |
| 1556 | return misc_register(&btrfs_misc); |
| 1557 | } |
| 1558 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1559 | static void btrfs_interface_exit(void) |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1560 | { |
| 1561 | if (misc_deregister(&btrfs_misc) < 0) |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1562 | printk(KERN_INFO "misc_deregister failed for control device"); |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1563 | } |
| 1564 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1565 | static int __init init_btrfs_fs(void) |
| 1566 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 1567 | int err; |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1568 | |
| 1569 | err = btrfs_init_sysfs(); |
| 1570 | if (err) |
| 1571 | return err; |
| 1572 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 1573 | btrfs_init_compress(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1574 | |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1575 | err = btrfs_init_cachep(); |
| 1576 | if (err) |
| 1577 | goto free_compress; |
| 1578 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1579 | err = extent_io_init(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1580 | if (err) |
| 1581 | goto free_cachep; |
| 1582 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1583 | err = extent_map_init(); |
| 1584 | if (err) |
| 1585 | goto free_extent_io; |
| 1586 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1587 | err = btrfs_delayed_inode_init(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1588 | if (err) |
| 1589 | goto free_extent_map; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1590 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1591 | err = btrfs_interface_init(); |
| 1592 | if (err) |
| 1593 | goto free_delayed_inode; |
| 1594 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1595 | err = register_filesystem(&btrfs_fs_type); |
| 1596 | if (err) |
| 1597 | goto unregister_ioctl; |
Chris Mason | b3c3da7 | 2008-07-23 12:12:13 -0400 | [diff] [blame] | 1598 | |
Jan Schmidt | e565d4b | 2012-03-23 17:14:20 +0100 | [diff] [blame] | 1599 | btrfs_init_lockdep(); |
| 1600 | |
Chris Mason | b3c3da7 | 2008-07-23 12:12:13 -0400 | [diff] [blame] | 1601 | printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1602 | return 0; |
| 1603 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1604 | unregister_ioctl: |
| 1605 | btrfs_interface_exit(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1606 | free_delayed_inode: |
| 1607 | btrfs_delayed_inode_exit(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1608 | free_extent_map: |
| 1609 | extent_map_exit(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1610 | free_extent_io: |
| 1611 | extent_io_exit(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1612 | free_cachep: |
| 1613 | btrfs_destroy_cachep(); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1614 | free_compress: |
| 1615 | btrfs_exit_compress(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 1616 | btrfs_exit_sysfs(); |
| 1617 | return err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1618 | } |
| 1619 | |
| 1620 | static void __exit exit_btrfs_fs(void) |
| 1621 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1622 | btrfs_destroy_cachep(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 1623 | btrfs_delayed_inode_exit(); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1624 | extent_map_exit(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1625 | extent_io_exit(); |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 1626 | btrfs_interface_exit(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1627 | unregister_filesystem(&btrfs_fs_type); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1628 | btrfs_exit_sysfs(); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1629 | btrfs_cleanup_fs_uuids(); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1630 | btrfs_exit_compress(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1631 | } |
| 1632 | |
| 1633 | module_init(init_btrfs_fs) |
| 1634 | module_exit(exit_btrfs_fs) |
| 1635 | |
| 1636 | MODULE_LICENSE("GPL"); |