Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
| 18 | |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 19 | #include <linux/blkdev.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 20 | #include <linux/module.h> |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 21 | #include <linux/buffer_head.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 22 | #include <linux/fs.h> |
| 23 | #include <linux/pagemap.h> |
| 24 | #include <linux/highmem.h> |
| 25 | #include <linux/time.h> |
| 26 | #include <linux/init.h> |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 27 | #include <linux/seq_file.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 28 | #include <linux/string.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 29 | #include <linux/backing-dev.h> |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 30 | #include <linux/mount.h> |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 31 | #include <linux/mpage.h> |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 32 | #include <linux/swap.h> |
| 33 | #include <linux/writeback.h> |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 34 | #include <linux/statfs.h> |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 35 | #include <linux/compat.h> |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 36 | #include <linux/parser.h> |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 37 | #include <linux/ctype.h> |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 38 | #include <linux/namei.h> |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 39 | #include <linux/miscdevice.h> |
Qinghuang Feng | 1bcbf31 | 2009-01-15 13:51:03 -0800 | [diff] [blame] | 40 | #include <linux/magic.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 41 | #include <linux/slab.h> |
Dan Magenheimer | 90a887c | 2011-05-26 10:01:56 -0600 | [diff] [blame] | 42 | #include <linux/cleancache.h> |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 43 | #include <linux/ratelimit.h> |
Filipe Brandenburger | 55e301f | 2013-01-29 06:04:50 +0000 | [diff] [blame] | 44 | #include <linux/btrfs.h> |
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 | 3a68637 | 2007-05-24 13:35:57 -0400 | [diff] [blame] | 50 | #include "print-tree.h" |
Filipe David Borba Manana | 14a958e | 2014-01-12 02:22:46 +0000 | [diff] [blame] | 51 | #include "hash.h" |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 52 | #include "props.h" |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 53 | #include "xattr.h" |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 54 | #include "volumes.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" |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 58 | #include "dev-replace.h" |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 59 | #include "free-space-cache.h" |
Wang Shilong | b9e9a6c | 2013-08-09 13:25:36 +0800 | [diff] [blame] | 60 | #include "backref.h" |
Josef Bacik | dc11dd5 | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 61 | #include "tests/btrfs-tests.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 62 | |
Mark Fasheh | d398210 | 2014-07-17 12:39:00 -0700 | [diff] [blame] | 63 | #include "qgroup.h" |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 64 | #define CREATE_TRACE_POINTS |
| 65 | #include <trace/events/btrfs.h> |
| 66 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 67 | static const struct super_operations btrfs_super_ops; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 68 | static struct file_system_type btrfs_fs_type; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 69 | |
Harald Hoyer | 0723a04 | 2013-11-19 11:36:05 +0100 | [diff] [blame] | 70 | static int btrfs_remount(struct super_block *sb, int *flags, char *data); |
| 71 | |
Jeff Mahoney | e33e17e | 2015-06-15 09:41:19 -0400 | [diff] [blame] | 72 | const char *btrfs_decode_error(int errno) |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 73 | { |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 74 | char *errstr = "unknown"; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 75 | |
| 76 | switch (errno) { |
| 77 | case -EIO: |
| 78 | errstr = "IO failure"; |
| 79 | break; |
| 80 | case -ENOMEM: |
| 81 | errstr = "Out of memory"; |
| 82 | break; |
| 83 | case -EROFS: |
| 84 | errstr = "Readonly filesystem"; |
| 85 | break; |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 86 | case -EEXIST: |
| 87 | errstr = "Object already exists"; |
| 88 | break; |
David Sterba | 94ef728 | 2013-03-20 14:29:47 +0000 | [diff] [blame] | 89 | case -ENOSPC: |
| 90 | errstr = "No space left"; |
| 91 | break; |
| 92 | case -ENOENT: |
| 93 | errstr = "No such entry"; |
| 94 | break; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | return errstr; |
| 98 | } |
| 99 | |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 100 | /* btrfs handle error by forcing the filesystem readonly */ |
| 101 | static void btrfs_handle_error(struct btrfs_fs_info *fs_info) |
| 102 | { |
| 103 | struct super_block *sb = fs_info->sb; |
| 104 | |
| 105 | if (sb->s_flags & MS_RDONLY) |
| 106 | return; |
| 107 | |
Miao Xie | 87533c4 | 2013-01-29 10:14:48 +0000 | [diff] [blame] | 108 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 109 | sb->s_flags |= MS_RDONLY; |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 110 | btrfs_info(fs_info, "forced readonly"); |
Stefan Behrens | 1acd683 | 2012-11-05 17:11:06 +0100 | [diff] [blame] | 111 | /* |
| 112 | * Note that a running device replace operation is not |
| 113 | * canceled here although there is no way to update |
| 114 | * the progress. It would add the risk of a deadlock, |
| 115 | * therefore the canceling is ommited. The only penalty |
| 116 | * is that some I/O remains active until the procedure |
| 117 | * completes. The next time when the filesystem is |
| 118 | * mounted writeable again, the device replace |
| 119 | * operation continues. |
| 120 | */ |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 121 | } |
| 122 | } |
| 123 | |
| 124 | /* |
Anand Jain | 34d9700 | 2016-03-16 16:43:06 +0800 | [diff] [blame] | 125 | * __btrfs_handle_fs_error decodes expected errors from the caller and |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 126 | * invokes the approciate error response. |
| 127 | */ |
David Sterba | c0d19e2 | 2015-04-24 19:11:57 +0200 | [diff] [blame] | 128 | __cold |
Anand Jain | 34d9700 | 2016-03-16 16:43:06 +0800 | [diff] [blame] | 129 | void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function, |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 130 | unsigned int line, int errno, const char *fmt, ...) |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 131 | { |
| 132 | struct super_block *sb = fs_info->sb; |
Anand Jain | 57d816a | 2015-08-14 18:32:52 +0800 | [diff] [blame] | 133 | #ifdef CONFIG_PRINTK |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 134 | const char *errstr; |
Anand Jain | 57d816a | 2015-08-14 18:32:52 +0800 | [diff] [blame] | 135 | #endif |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 136 | |
| 137 | /* |
| 138 | * Special case: if the error is EROFS, and we're already |
| 139 | * under MS_RDONLY, then it is safe here. |
| 140 | */ |
| 141 | if (errno == -EROFS && (sb->s_flags & MS_RDONLY)) |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 142 | return; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 143 | |
Anand Jain | 57d816a | 2015-08-14 18:32:52 +0800 | [diff] [blame] | 144 | #ifdef CONFIG_PRINTK |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 145 | errstr = btrfs_decode_error(errno); |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 146 | if (fmt) { |
Eric Sandeen | 37252a6 | 2013-01-31 00:54:58 +0000 | [diff] [blame] | 147 | struct va_format vaf; |
| 148 | va_list args; |
| 149 | |
| 150 | va_start(args, fmt); |
| 151 | vaf.fmt = fmt; |
| 152 | vaf.va = &args; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 153 | |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 154 | printk(KERN_CRIT |
| 155 | "BTRFS: error (device %s) in %s:%d: errno=%d %s (%pV)\n", |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 156 | sb->s_id, function, line, errno, errstr, &vaf); |
Eric Sandeen | 37252a6 | 2013-01-31 00:54:58 +0000 | [diff] [blame] | 157 | va_end(args); |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 158 | } else { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 159 | printk(KERN_CRIT "BTRFS: error (device %s) in %s:%d: errno=%d %s\n", |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 160 | sb->s_id, function, line, errno, errstr); |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 161 | } |
Anand Jain | 57d816a | 2015-08-14 18:32:52 +0800 | [diff] [blame] | 162 | #endif |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 163 | |
Anand Jain | 0713d90 | 2016-03-17 10:38:57 +0800 | [diff] [blame] | 164 | /* |
| 165 | * Today we only save the error info to memory. Long term we'll |
| 166 | * also send it down to the disk |
| 167 | */ |
| 168 | set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); |
| 169 | |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 170 | /* Don't go through full error handling during mount */ |
Josef Bacik | cf79ffb | 2013-04-01 11:23:58 -0400 | [diff] [blame] | 171 | if (sb->s_flags & MS_BORN) |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 172 | btrfs_handle_error(fs_info); |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 173 | } |
| 174 | |
Anand Jain | 57d816a | 2015-08-14 18:32:52 +0800 | [diff] [blame] | 175 | #ifdef CONFIG_PRINTK |
Joe Perches | 533574c | 2012-07-30 14:40:13 -0700 | [diff] [blame] | 176 | static const char * const logtypes[] = { |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 177 | "emergency", |
| 178 | "alert", |
| 179 | "critical", |
| 180 | "error", |
| 181 | "warning", |
| 182 | "notice", |
| 183 | "info", |
| 184 | "debug", |
| 185 | }; |
| 186 | |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 187 | void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 188 | { |
| 189 | struct super_block *sb = fs_info->sb; |
| 190 | char lvl[4]; |
| 191 | struct va_format vaf; |
| 192 | va_list args; |
| 193 | const char *type = logtypes[4]; |
Joe Perches | 533574c | 2012-07-30 14:40:13 -0700 | [diff] [blame] | 194 | int kern_level; |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 195 | |
| 196 | va_start(args, fmt); |
| 197 | |
Joe Perches | 533574c | 2012-07-30 14:40:13 -0700 | [diff] [blame] | 198 | kern_level = printk_get_level(fmt); |
| 199 | if (kern_level) { |
| 200 | size_t size = printk_skip_level(fmt) - fmt; |
| 201 | memcpy(lvl, fmt, size); |
| 202 | lvl[size] = '\0'; |
| 203 | fmt += size; |
| 204 | type = logtypes[kern_level - '0']; |
Jeff Mahoney | 4da3511 | 2012-03-01 14:57:30 +0100 | [diff] [blame] | 205 | } else |
| 206 | *lvl = '\0'; |
| 207 | |
| 208 | vaf.fmt = fmt; |
| 209 | vaf.va = &args; |
Joe Perches | 533574c | 2012-07-30 14:40:13 -0700 | [diff] [blame] | 210 | |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 211 | printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf); |
Joe Perches | 533574c | 2012-07-30 14:40:13 -0700 | [diff] [blame] | 212 | |
| 213 | va_end(args); |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 214 | } |
Joe Perches | 533574c | 2012-07-30 14:40:13 -0700 | [diff] [blame] | 215 | #endif |
| 216 | |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 217 | /* |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 218 | * We only mark the transaction aborted and then set the file system read-only. |
| 219 | * This will prevent new transactions from starting or trying to join this |
| 220 | * one. |
| 221 | * |
| 222 | * This means that error recovery at the call site is limited to freeing |
| 223 | * any local memory allocations and passing the error code up without |
| 224 | * further cleanup. The transaction should complete as it normally would |
| 225 | * in the call path but will return -EIO. |
| 226 | * |
| 227 | * We'll complete the cleanup in btrfs_end_transaction and |
| 228 | * btrfs_commit_transaction. |
| 229 | */ |
David Sterba | c0d19e2 | 2015-04-24 19:11:57 +0200 | [diff] [blame] | 230 | __cold |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 231 | void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, |
| 232 | struct btrfs_root *root, const char *function, |
| 233 | unsigned int line, int errno) |
| 234 | { |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 235 | trans->aborted = errno; |
| 236 | /* Nothing used. The other threads that have joined this |
| 237 | * transaction may be able to continue. */ |
Filipe Manana | c92f6be | 2014-11-26 15:28:55 +0000 | [diff] [blame] | 238 | if (!trans->blocks_used && list_empty(&trans->new_bgs)) { |
Miao Xie | 69ce977 | 2012-09-06 04:04:44 -0600 | [diff] [blame] | 239 | const char *errstr; |
| 240 | |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 241 | errstr = btrfs_decode_error(errno); |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 242 | btrfs_warn(root->fs_info, |
| 243 | "%s:%d: Aborting unused transaction(%s).", |
| 244 | function, line, errstr); |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 245 | return; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 246 | } |
Miao Xie | 8d25a08 | 2013-01-15 06:27:25 +0000 | [diff] [blame] | 247 | ACCESS_ONCE(trans->transaction->aborted) = errno; |
Josef Bacik | 501407a | 2013-06-10 16:47:23 -0400 | [diff] [blame] | 248 | /* Wake up anybody who may be waiting on this transaction */ |
| 249 | wake_up(&root->fs_info->transaction_wait); |
| 250 | wake_up(&root->fs_info->transaction_blocked_wait); |
Anand Jain | 34d9700 | 2016-03-16 16:43:06 +0800 | [diff] [blame] | 251 | __btrfs_handle_fs_error(root->fs_info, function, line, errno, NULL); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 252 | } |
| 253 | /* |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 254 | * __btrfs_panic decodes unexpected, fatal errors from the caller, |
| 255 | * issues an alert, and either panics or BUGs, depending on mount options. |
| 256 | */ |
David Sterba | c0d19e2 | 2015-04-24 19:11:57 +0200 | [diff] [blame] | 257 | __cold |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 258 | void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, |
| 259 | unsigned int line, int errno, const char *fmt, ...) |
| 260 | { |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 261 | char *s_id = "<unknown>"; |
| 262 | const char *errstr; |
| 263 | struct va_format vaf = { .fmt = fmt }; |
| 264 | va_list args; |
| 265 | |
| 266 | if (fs_info) |
| 267 | s_id = fs_info->sb->s_id; |
| 268 | |
| 269 | va_start(args, fmt); |
| 270 | vaf.va = &args; |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 271 | |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 272 | errstr = btrfs_decode_error(errno); |
Eric Sandeen | aa43a17 | 2013-01-31 00:54:55 +0000 | [diff] [blame] | 273 | if (fs_info && (fs_info->mount_opt & BTRFS_MOUNT_PANIC_ON_FATAL_ERROR)) |
David Sterba | 0874881 | 2013-03-12 14:46:08 +0000 | [diff] [blame] | 274 | panic(KERN_CRIT "BTRFS panic (device %s) in %s:%d: %pV (errno=%d %s)\n", |
| 275 | s_id, function, line, &vaf, errno, errstr); |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 276 | |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 277 | btrfs_crit(fs_info, "panic in %s:%d: %pV (errno=%d %s)", |
| 278 | function, line, &vaf, errno, errstr); |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 279 | va_end(args); |
| 280 | /* Caller calls BUG() */ |
liubo | acce952 | 2011-01-06 19:30:25 +0800 | [diff] [blame] | 281 | } |
| 282 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 283 | static void btrfs_put_super(struct super_block *sb) |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 284 | { |
David Sterba | 3abdbd7 | 2014-06-04 18:10:45 +0200 | [diff] [blame] | 285 | close_ctree(btrfs_sb(sb)->tree_root); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 286 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 287 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 288 | enum { |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 289 | Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum, |
Josef Bacik | 287a0ab | 2010-03-19 18:07:23 +0000 | [diff] [blame] | 290 | Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd, |
| 291 | Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 292 | Opt_compress_type, Opt_compress_force, Opt_compress_force_type, |
| 293 | Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard, |
Omar Sandoval | 70f6d82 | 2015-09-29 20:50:38 -0700 | [diff] [blame] | 294 | Opt_space_cache, Opt_space_cache_version, Opt_clear_cache, |
| 295 | Opt_user_subvol_rm_allowed, Opt_enospc_debug, Opt_subvolrootid, |
| 296 | Opt_defrag, Opt_inode_cache, Opt_no_space_cache, Opt_recovery, |
| 297 | Opt_skip_balance, Opt_check_integrity, |
| 298 | Opt_check_integrity_including_extent_data, |
Stefan Behrens | f420ee1 | 2013-08-15 17:11:24 +0200 | [diff] [blame] | 299 | Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, |
Qu Wenruo | e07a2ad | 2014-01-06 09:58:27 +0800 | [diff] [blame] | 300 | Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard, |
Qu Wenruo | a258af7 | 2014-01-06 09:58:31 +0800 | [diff] [blame] | 301 | Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow, |
Qu Wenruo | 8dcddfa | 2016-01-19 10:23:02 +0800 | [diff] [blame] | 302 | Opt_datasum, Opt_treelog, Opt_noinode_cache, Opt_usebackuproot, |
Qu Wenruo | fed8f16 | 2016-01-19 10:23:04 +0800 | [diff] [blame] | 303 | Opt_nologreplay, Opt_norecovery, |
Josef Bacik | d0bd456 | 2015-09-23 14:54:14 -0400 | [diff] [blame] | 304 | #ifdef CONFIG_BTRFS_DEBUG |
| 305 | Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all, |
| 306 | #endif |
Ilya Dryomov | 9555c6c | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 307 | Opt_err, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 308 | }; |
| 309 | |
David Sterba | 4d4ab6d | 2015-11-19 11:42:31 +0100 | [diff] [blame] | 310 | static const match_table_t tokens = { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 311 | {Opt_degraded, "degraded"}, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 312 | {Opt_subvol, "subvol=%s"}, |
Wang Shilong | 1493381 | 2013-07-24 10:29:20 +0800 | [diff] [blame] | 313 | {Opt_subvolid, "subvolid=%s"}, |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 314 | {Opt_device, "device=%s"}, |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 315 | {Opt_nodatasum, "nodatasum"}, |
Qu Wenruo | d399167 | 2014-01-06 09:58:32 +0800 | [diff] [blame] | 316 | {Opt_datasum, "datasum"}, |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 317 | {Opt_nodatacow, "nodatacow"}, |
Qu Wenruo | a258af7 | 2014-01-06 09:58:31 +0800 | [diff] [blame] | 318 | {Opt_datacow, "datacow"}, |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 319 | {Opt_nobarrier, "nobarrier"}, |
Qu Wenruo | 842bef5 | 2014-01-06 09:58:25 +0800 | [diff] [blame] | 320 | {Opt_barrier, "barrier"}, |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 321 | {Opt_max_inline, "max_inline=%s"}, |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 322 | {Opt_alloc_start, "alloc_start=%s"}, |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 323 | {Opt_thread_pool, "thread_pool=%d"}, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 324 | {Opt_compress, "compress"}, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 325 | {Opt_compress_type, "compress=%s"}, |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 326 | {Opt_compress_force, "compress-force"}, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 327 | {Opt_compress_force_type, "compress-force=%s"}, |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 328 | {Opt_ssd, "ssd"}, |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 329 | {Opt_ssd_spread, "ssd_spread"}, |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 330 | {Opt_nossd, "nossd"}, |
Qu Wenruo | bd0330a | 2014-01-06 09:58:30 +0800 | [diff] [blame] | 331 | {Opt_acl, "acl"}, |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 332 | {Opt_noacl, "noacl"}, |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 333 | {Opt_notreelog, "notreelog"}, |
Qu Wenruo | a88998f | 2014-01-06 09:58:33 +0800 | [diff] [blame] | 334 | {Opt_treelog, "treelog"}, |
Qu Wenruo | 96da091 | 2016-01-19 10:23:03 +0800 | [diff] [blame] | 335 | {Opt_nologreplay, "nologreplay"}, |
Qu Wenruo | fed8f16 | 2016-01-19 10:23:04 +0800 | [diff] [blame] | 336 | {Opt_norecovery, "norecovery"}, |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 337 | {Opt_flushoncommit, "flushoncommit"}, |
Qu Wenruo | 2c9ee85 | 2014-01-06 09:58:29 +0800 | [diff] [blame] | 338 | {Opt_noflushoncommit, "noflushoncommit"}, |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 339 | {Opt_ratio, "metadata_ratio=%d"}, |
Christoph Hellwig | e244a0a | 2009-10-14 09:24:59 -0400 | [diff] [blame] | 340 | {Opt_discard, "discard"}, |
Qu Wenruo | e07a2ad | 2014-01-06 09:58:27 +0800 | [diff] [blame] | 341 | {Opt_nodiscard, "nodiscard"}, |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 342 | {Opt_space_cache, "space_cache"}, |
Omar Sandoval | 70f6d82 | 2015-09-29 20:50:38 -0700 | [diff] [blame] | 343 | {Opt_space_cache_version, "space_cache=%s"}, |
Josef Bacik | 88c2ba3 | 2010-09-21 14:21:34 -0400 | [diff] [blame] | 344 | {Opt_clear_cache, "clear_cache"}, |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 345 | {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"}, |
Chris Mason | 9143565 | 2011-02-16 13:10:41 -0500 | [diff] [blame] | 346 | {Opt_enospc_debug, "enospc_debug"}, |
Qu Wenruo | 5303629 | 2014-01-06 09:58:28 +0800 | [diff] [blame] | 347 | {Opt_noenospc_debug, "noenospc_debug"}, |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 348 | {Opt_subvolrootid, "subvolrootid=%d"}, |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 349 | {Opt_defrag, "autodefrag"}, |
Qu Wenruo | fc0ca9af | 2014-01-06 09:58:26 +0800 | [diff] [blame] | 350 | {Opt_nodefrag, "noautodefrag"}, |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 351 | {Opt_inode_cache, "inode_cache"}, |
Qu Wenruo | 3818aea | 2014-01-13 13:36:06 +0800 | [diff] [blame] | 352 | {Opt_noinode_cache, "noinode_cache"}, |
David Sterba | 8965593 | 2011-11-11 10:14:57 -0500 | [diff] [blame] | 353 | {Opt_no_space_cache, "nospace_cache"}, |
Qu Wenruo | 8dcddfa | 2016-01-19 10:23:02 +0800 | [diff] [blame] | 354 | {Opt_recovery, "recovery"}, /* deprecated */ |
| 355 | {Opt_usebackuproot, "usebackuproot"}, |
Ilya Dryomov | 9555c6c | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 356 | {Opt_skip_balance, "skip_balance"}, |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 357 | {Opt_check_integrity, "check_int"}, |
| 358 | {Opt_check_integrity_including_extent_data, "check_int_data"}, |
| 359 | {Opt_check_integrity_print_mask, "check_int_print_mask=%d"}, |
Stefan Behrens | f420ee1 | 2013-08-15 17:11:24 +0200 | [diff] [blame] | 360 | {Opt_rescan_uuid_tree, "rescan_uuid_tree"}, |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 361 | {Opt_fatal_errors, "fatal_errors=%s"}, |
David Sterba | 8b87dc1 | 2013-08-01 18:14:52 +0200 | [diff] [blame] | 362 | {Opt_commit_interval, "commit=%d"}, |
Josef Bacik | d0bd456 | 2015-09-23 14:54:14 -0400 | [diff] [blame] | 363 | #ifdef CONFIG_BTRFS_DEBUG |
| 364 | {Opt_fragment_data, "fragment=data"}, |
| 365 | {Opt_fragment_metadata, "fragment=metadata"}, |
| 366 | {Opt_fragment_all, "fragment=all"}, |
| 367 | #endif |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 368 | {Opt_err, NULL}, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 369 | }; |
| 370 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 371 | /* |
| 372 | * Regular mount options parser. Everything that is needed only when |
| 373 | * reading in a new superblock is parsed here. |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 374 | * XXX JDM: This needs to be cleaned up for remount. |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 375 | */ |
Qu Wenruo | 96da091 | 2016-01-19 10:23:03 +0800 | [diff] [blame] | 376 | int btrfs_parse_options(struct btrfs_root *root, char *options, |
| 377 | unsigned long new_flags) |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 378 | { |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 379 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 380 | substring_t args[MAX_OPT_ARGS]; |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 381 | char *p, *num, *orig = NULL; |
| 382 | u64 cache_gen; |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 383 | int intarg; |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 384 | int ret = 0; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 385 | char *compress_type; |
| 386 | bool compress_force = false; |
Tsutomu Itoh | b7c47bb | 2016-01-06 17:03:40 +0900 | [diff] [blame] | 387 | enum btrfs_compression_type saved_compress_type; |
| 388 | bool saved_compress_force; |
| 389 | int no_compress = 0; |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 390 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 391 | cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy); |
Omar Sandoval | 70f6d82 | 2015-09-29 20:50:38 -0700 | [diff] [blame] | 392 | if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE)) |
| 393 | btrfs_set_opt(info->mount_opt, FREE_SPACE_TREE); |
| 394 | else if (cache_gen) |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 395 | btrfs_set_opt(info->mount_opt, SPACE_CACHE); |
| 396 | |
Qu Wenruo | 96da091 | 2016-01-19 10:23:03 +0800 | [diff] [blame] | 397 | /* |
| 398 | * Even the options are empty, we still need to do extra check |
| 399 | * against new flags |
| 400 | */ |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 401 | if (!options) |
Qu Wenruo | 96da091 | 2016-01-19 10:23:03 +0800 | [diff] [blame] | 402 | goto check; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 403 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 404 | /* |
| 405 | * strsep changes the string, duplicate it because parse_options |
| 406 | * gets called twice |
| 407 | */ |
| 408 | options = kstrdup(options, GFP_NOFS); |
| 409 | if (!options) |
| 410 | return -ENOMEM; |
| 411 | |
Josef Bacik | da495ec | 2010-02-25 20:38:35 +0000 | [diff] [blame] | 412 | orig = options; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 413 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 414 | while ((p = strsep(&options, ",")) != NULL) { |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 415 | int token; |
| 416 | if (!*p) |
| 417 | continue; |
| 418 | |
| 419 | token = match_token(p, tokens, args); |
| 420 | switch (token) { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 421 | case Opt_degraded: |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 422 | btrfs_info(root->fs_info, "allowing degraded mounts"); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 423 | btrfs_set_opt(info->mount_opt, DEGRADED); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 424 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 425 | case Opt_subvol: |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 426 | case Opt_subvolid: |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 427 | case Opt_subvolrootid: |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 428 | case Opt_device: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 429 | /* |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 430 | * These are parsed by btrfs_parse_early_options |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 431 | * and can be happily ignored here. |
| 432 | */ |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 433 | break; |
| 434 | case Opt_nodatasum: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 435 | btrfs_set_and_info(root, NODATASUM, |
| 436 | "setting nodatasum"); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 437 | break; |
Qu Wenruo | d399167 | 2014-01-06 09:58:32 +0800 | [diff] [blame] | 438 | case Opt_datasum: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 439 | if (btrfs_test_opt(root, NODATASUM)) { |
| 440 | if (btrfs_test_opt(root, NODATACOW)) |
| 441 | btrfs_info(root->fs_info, "setting datasum, datacow enabled"); |
| 442 | else |
| 443 | btrfs_info(root->fs_info, "setting datasum"); |
| 444 | } |
Qu Wenruo | d399167 | 2014-01-06 09:58:32 +0800 | [diff] [blame] | 445 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
| 446 | btrfs_clear_opt(info->mount_opt, NODATASUM); |
| 447 | break; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 448 | case Opt_nodatacow: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 449 | if (!btrfs_test_opt(root, NODATACOW)) { |
| 450 | if (!btrfs_test_opt(root, COMPRESS) || |
| 451 | !btrfs_test_opt(root, FORCE_COMPRESS)) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 452 | btrfs_info(root->fs_info, |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 453 | "setting nodatacow, compression disabled"); |
| 454 | } else { |
| 455 | btrfs_info(root->fs_info, "setting nodatacow"); |
| 456 | } |
Andrei Popa | bedb2cc | 2012-09-20 08:42:11 -0600 | [diff] [blame] | 457 | } |
Andrei Popa | bedb2cc | 2012-09-20 08:42:11 -0600 | [diff] [blame] | 458 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
| 459 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 460 | btrfs_set_opt(info->mount_opt, NODATACOW); |
| 461 | btrfs_set_opt(info->mount_opt, NODATASUM); |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 462 | break; |
Qu Wenruo | a258af7 | 2014-01-06 09:58:31 +0800 | [diff] [blame] | 463 | case Opt_datacow: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 464 | btrfs_clear_and_info(root, NODATACOW, |
| 465 | "setting datacow"); |
Qu Wenruo | a258af7 | 2014-01-06 09:58:31 +0800 | [diff] [blame] | 466 | break; |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 467 | case Opt_compress_force: |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 468 | case Opt_compress_force_type: |
| 469 | compress_force = true; |
Eric Sandeen | 1c697d4 | 2013-01-31 00:54:56 +0000 | [diff] [blame] | 470 | /* Fallthrough */ |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 471 | case Opt_compress: |
| 472 | case Opt_compress_type: |
Tsutomu Itoh | b7c47bb | 2016-01-06 17:03:40 +0900 | [diff] [blame] | 473 | saved_compress_type = btrfs_test_opt(root, COMPRESS) ? |
| 474 | info->compress_type : BTRFS_COMPRESS_NONE; |
| 475 | saved_compress_force = |
| 476 | btrfs_test_opt(root, FORCE_COMPRESS); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 477 | if (token == Opt_compress || |
| 478 | token == Opt_compress_force || |
| 479 | strcmp(args[0].from, "zlib") == 0) { |
| 480 | compress_type = "zlib"; |
| 481 | info->compress_type = BTRFS_COMPRESS_ZLIB; |
Arnd Hannemann | 063849e | 2012-04-16 15:27:51 +0200 | [diff] [blame] | 482 | btrfs_set_opt(info->mount_opt, COMPRESS); |
Andrei Popa | bedb2cc | 2012-09-20 08:42:11 -0600 | [diff] [blame] | 483 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
| 484 | btrfs_clear_opt(info->mount_opt, NODATASUM); |
Tsutomu Itoh | b7c47bb | 2016-01-06 17:03:40 +0900 | [diff] [blame] | 485 | no_compress = 0; |
Li Zefan | a6fa6fa | 2010-10-25 15:12:26 +0800 | [diff] [blame] | 486 | } else if (strcmp(args[0].from, "lzo") == 0) { |
| 487 | compress_type = "lzo"; |
| 488 | info->compress_type = BTRFS_COMPRESS_LZO; |
Arnd Hannemann | 063849e | 2012-04-16 15:27:51 +0200 | [diff] [blame] | 489 | btrfs_set_opt(info->mount_opt, COMPRESS); |
Andrei Popa | bedb2cc | 2012-09-20 08:42:11 -0600 | [diff] [blame] | 490 | btrfs_clear_opt(info->mount_opt, NODATACOW); |
| 491 | btrfs_clear_opt(info->mount_opt, NODATASUM); |
Mitch Harder | 2b0ce2c | 2012-07-24 11:58:43 -0600 | [diff] [blame] | 492 | btrfs_set_fs_incompat(info, COMPRESS_LZO); |
Tsutomu Itoh | b7c47bb | 2016-01-06 17:03:40 +0900 | [diff] [blame] | 493 | no_compress = 0; |
Arnd Hannemann | 063849e | 2012-04-16 15:27:51 +0200 | [diff] [blame] | 494 | } else if (strncmp(args[0].from, "no", 2) == 0) { |
| 495 | compress_type = "no"; |
Arnd Hannemann | 063849e | 2012-04-16 15:27:51 +0200 | [diff] [blame] | 496 | btrfs_clear_opt(info->mount_opt, COMPRESS); |
| 497 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); |
| 498 | compress_force = false; |
Tsutomu Itoh | b7c47bb | 2016-01-06 17:03:40 +0900 | [diff] [blame] | 499 | no_compress++; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 500 | } else { |
| 501 | ret = -EINVAL; |
| 502 | goto out; |
| 503 | } |
| 504 | |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 505 | if (compress_force) { |
Tsutomu Itoh | b7c47bb | 2016-01-06 17:03:40 +0900 | [diff] [blame] | 506 | btrfs_set_opt(info->mount_opt, FORCE_COMPRESS); |
David Sterba | 143f363 | 2014-07-29 17:41:08 +0200 | [diff] [blame] | 507 | } else { |
Wang Shilong | 4027e0f | 2014-06-30 10:51:25 +0800 | [diff] [blame] | 508 | /* |
| 509 | * If we remount from compress-force=xxx to |
| 510 | * compress=xxx, we need clear FORCE_COMPRESS |
| 511 | * flag, otherwise, there is no way for users |
| 512 | * to disable forcible compression separately. |
| 513 | */ |
| 514 | btrfs_clear_opt(info->mount_opt, FORCE_COMPRESS); |
Miao Xie | a7e252a | 2013-11-22 18:47:59 +0800 | [diff] [blame] | 515 | } |
Tsutomu Itoh | b7c47bb | 2016-01-06 17:03:40 +0900 | [diff] [blame] | 516 | if ((btrfs_test_opt(root, COMPRESS) && |
| 517 | (info->compress_type != saved_compress_type || |
| 518 | compress_force != saved_compress_force)) || |
| 519 | (!btrfs_test_opt(root, COMPRESS) && |
| 520 | no_compress == 1)) { |
| 521 | btrfs_info(root->fs_info, |
| 522 | "%s %s compression", |
| 523 | (compress_force) ? "force" : "use", |
| 524 | compress_type); |
| 525 | } |
| 526 | compress_force = false; |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 527 | break; |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 528 | case Opt_ssd: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 529 | btrfs_set_and_info(root, SSD, |
| 530 | "use ssd allocation scheme"); |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 531 | break; |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 532 | case Opt_ssd_spread: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 533 | btrfs_set_and_info(root, SSD_SPREAD, |
| 534 | "use spread ssd allocation scheme"); |
Eric Sandeen | 2aa06a3 | 2014-06-27 16:50:31 -0500 | [diff] [blame] | 535 | btrfs_set_opt(info->mount_opt, SSD); |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 536 | break; |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 537 | case Opt_nossd: |
Eric Sandeen | 2aa06a3 | 2014-06-27 16:50:31 -0500 | [diff] [blame] | 538 | btrfs_set_and_info(root, NOSSD, |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 539 | "not using ssd allocation scheme"); |
Chris Mason | 3b30c22 | 2009-06-09 16:42:22 -0400 | [diff] [blame] | 540 | btrfs_clear_opt(info->mount_opt, SSD); |
| 541 | break; |
Qu Wenruo | 842bef5 | 2014-01-06 09:58:25 +0800 | [diff] [blame] | 542 | case Opt_barrier: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 543 | btrfs_clear_and_info(root, NOBARRIER, |
| 544 | "turning on barriers"); |
Qu Wenruo | 842bef5 | 2014-01-06 09:58:25 +0800 | [diff] [blame] | 545 | break; |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 546 | case Opt_nobarrier: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 547 | btrfs_set_and_info(root, NOBARRIER, |
| 548 | "turning off barriers"); |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 549 | break; |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 550 | case Opt_thread_pool: |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 551 | ret = match_int(&args[0], &intarg); |
| 552 | if (ret) { |
| 553 | goto out; |
| 554 | } else if (intarg > 0) { |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 555 | info->thread_pool_size = intarg; |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 556 | } else { |
| 557 | ret = -EINVAL; |
| 558 | goto out; |
| 559 | } |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 560 | break; |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 561 | case Opt_max_inline: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 562 | num = match_strdup(&args[0]); |
| 563 | if (num) { |
Akinobu Mita | 9174846 | 2010-02-28 10:59:11 +0000 | [diff] [blame] | 564 | info->max_inline = memparse(num, NULL); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 565 | kfree(num); |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 566 | |
Chris Mason | 15ada04 | 2008-06-11 16:51:38 -0400 | [diff] [blame] | 567 | if (info->max_inline) { |
Mitch Harder | feb5f96 | 2014-02-13 09:13:16 -0600 | [diff] [blame] | 568 | info->max_inline = min_t(u64, |
Chris Mason | 15ada04 | 2008-06-11 16:51:38 -0400 | [diff] [blame] | 569 | info->max_inline, |
| 570 | root->sectorsize); |
| 571 | } |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 572 | btrfs_info(root->fs_info, "max_inline at %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 573 | info->max_inline); |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 574 | } else { |
| 575 | ret = -ENOMEM; |
| 576 | goto out; |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 577 | } |
| 578 | break; |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 579 | case Opt_alloc_start: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 580 | num = match_strdup(&args[0]); |
| 581 | if (num) { |
Miao Xie | c018dae | 2013-01-29 10:07:33 +0000 | [diff] [blame] | 582 | mutex_lock(&info->chunk_mutex); |
Akinobu Mita | 9174846 | 2010-02-28 10:59:11 +0000 | [diff] [blame] | 583 | info->alloc_start = memparse(num, NULL); |
Miao Xie | c018dae | 2013-01-29 10:07:33 +0000 | [diff] [blame] | 584 | mutex_unlock(&info->chunk_mutex); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 585 | kfree(num); |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 586 | btrfs_info(root->fs_info, "allocations start at %llu", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 587 | info->alloc_start); |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 588 | } else { |
| 589 | ret = -ENOMEM; |
| 590 | goto out; |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 591 | } |
| 592 | break; |
Qu Wenruo | bd0330a | 2014-01-06 09:58:30 +0800 | [diff] [blame] | 593 | case Opt_acl: |
Guangliang Zhao | 45ff35d | 2014-05-12 11:04:33 +0800 | [diff] [blame] | 594 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
Qu Wenruo | bd0330a | 2014-01-06 09:58:30 +0800 | [diff] [blame] | 595 | root->fs_info->sb->s_flags |= MS_POSIXACL; |
| 596 | break; |
Guangliang Zhao | 45ff35d | 2014-05-12 11:04:33 +0800 | [diff] [blame] | 597 | #else |
| 598 | btrfs_err(root->fs_info, |
| 599 | "support for ACL not compiled in!"); |
| 600 | ret = -EINVAL; |
| 601 | goto out; |
| 602 | #endif |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 603 | case Opt_noacl: |
| 604 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; |
| 605 | break; |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 606 | case Opt_notreelog: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 607 | btrfs_set_and_info(root, NOTREELOG, |
| 608 | "disabling tree log"); |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 609 | break; |
Qu Wenruo | a88998f | 2014-01-06 09:58:33 +0800 | [diff] [blame] | 610 | case Opt_treelog: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 611 | btrfs_clear_and_info(root, NOTREELOG, |
| 612 | "enabling tree log"); |
Qu Wenruo | a88998f | 2014-01-06 09:58:33 +0800 | [diff] [blame] | 613 | break; |
Qu Wenruo | fed8f16 | 2016-01-19 10:23:04 +0800 | [diff] [blame] | 614 | case Opt_norecovery: |
Qu Wenruo | 96da091 | 2016-01-19 10:23:03 +0800 | [diff] [blame] | 615 | case Opt_nologreplay: |
| 616 | btrfs_set_and_info(root, NOLOGREPLAY, |
| 617 | "disabling log replay at mount time"); |
| 618 | break; |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 619 | case Opt_flushoncommit: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 620 | btrfs_set_and_info(root, FLUSHONCOMMIT, |
| 621 | "turning on flush-on-commit"); |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 622 | break; |
Qu Wenruo | 2c9ee85 | 2014-01-06 09:58:29 +0800 | [diff] [blame] | 623 | case Opt_noflushoncommit: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 624 | btrfs_clear_and_info(root, FLUSHONCOMMIT, |
| 625 | "turning off flush-on-commit"); |
Qu Wenruo | 2c9ee85 | 2014-01-06 09:58:29 +0800 | [diff] [blame] | 626 | break; |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 627 | case Opt_ratio: |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 628 | ret = match_int(&args[0], &intarg); |
| 629 | if (ret) { |
| 630 | goto out; |
| 631 | } else if (intarg >= 0) { |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 632 | info->metadata_ratio = intarg; |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 633 | btrfs_info(root->fs_info, "metadata ratio %d", |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 634 | info->metadata_ratio); |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 635 | } else { |
| 636 | ret = -EINVAL; |
| 637 | goto out; |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 638 | } |
| 639 | break; |
Christoph Hellwig | e244a0a | 2009-10-14 09:24:59 -0400 | [diff] [blame] | 640 | case Opt_discard: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 641 | btrfs_set_and_info(root, DISCARD, |
| 642 | "turning on discard"); |
Christoph Hellwig | e244a0a | 2009-10-14 09:24:59 -0400 | [diff] [blame] | 643 | break; |
Qu Wenruo | e07a2ad | 2014-01-06 09:58:27 +0800 | [diff] [blame] | 644 | case Opt_nodiscard: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 645 | btrfs_clear_and_info(root, DISCARD, |
| 646 | "turning off discard"); |
Qu Wenruo | e07a2ad | 2014-01-06 09:58:27 +0800 | [diff] [blame] | 647 | break; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 648 | case Opt_space_cache: |
Omar Sandoval | 70f6d82 | 2015-09-29 20:50:38 -0700 | [diff] [blame] | 649 | case Opt_space_cache_version: |
| 650 | if (token == Opt_space_cache || |
| 651 | strcmp(args[0].from, "v1") == 0) { |
| 652 | btrfs_clear_opt(root->fs_info->mount_opt, |
| 653 | FREE_SPACE_TREE); |
| 654 | btrfs_set_and_info(root, SPACE_CACHE, |
| 655 | "enabling disk space caching"); |
| 656 | } else if (strcmp(args[0].from, "v2") == 0) { |
| 657 | btrfs_clear_opt(root->fs_info->mount_opt, |
| 658 | SPACE_CACHE); |
| 659 | btrfs_set_and_info(root, FREE_SPACE_TREE, |
| 660 | "enabling free space tree"); |
| 661 | } else { |
| 662 | ret = -EINVAL; |
| 663 | goto out; |
| 664 | } |
Josef Bacik | 0de9087 | 2010-11-19 13:40:41 +0000 | [diff] [blame] | 665 | break; |
Stefan Behrens | f420ee1 | 2013-08-15 17:11:24 +0200 | [diff] [blame] | 666 | case Opt_rescan_uuid_tree: |
| 667 | btrfs_set_opt(info->mount_opt, RESCAN_UUID_TREE); |
| 668 | break; |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 669 | case Opt_no_space_cache: |
Omar Sandoval | 70f6d82 | 2015-09-29 20:50:38 -0700 | [diff] [blame] | 670 | if (btrfs_test_opt(root, SPACE_CACHE)) { |
| 671 | btrfs_clear_and_info(root, SPACE_CACHE, |
| 672 | "disabling disk space caching"); |
| 673 | } |
| 674 | if (btrfs_test_opt(root, FREE_SPACE_TREE)) { |
| 675 | btrfs_clear_and_info(root, FREE_SPACE_TREE, |
| 676 | "disabling free space tree"); |
| 677 | } |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 678 | break; |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 679 | case Opt_inode_cache: |
David Sterba | 7e1876a | 2014-02-05 15:26:17 +0100 | [diff] [blame] | 680 | btrfs_set_pending_and_info(info, INODE_MAP_CACHE, |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 681 | "enabling inode map caching"); |
Qu Wenruo | 3818aea | 2014-01-13 13:36:06 +0800 | [diff] [blame] | 682 | break; |
| 683 | case Opt_noinode_cache: |
David Sterba | 7e1876a | 2014-02-05 15:26:17 +0100 | [diff] [blame] | 684 | btrfs_clear_pending_and_info(info, INODE_MAP_CACHE, |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 685 | "disabling inode map caching"); |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 686 | break; |
Josef Bacik | 88c2ba3 | 2010-09-21 14:21:34 -0400 | [diff] [blame] | 687 | case Opt_clear_cache: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 688 | btrfs_set_and_info(root, CLEAR_CACHE, |
| 689 | "force clearing of disk cache"); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 690 | break; |
Sage Weil | 4260f7c | 2010-10-29 15:46:43 -0400 | [diff] [blame] | 691 | case Opt_user_subvol_rm_allowed: |
| 692 | btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED); |
| 693 | break; |
Chris Mason | 9143565 | 2011-02-16 13:10:41 -0500 | [diff] [blame] | 694 | case Opt_enospc_debug: |
| 695 | btrfs_set_opt(info->mount_opt, ENOSPC_DEBUG); |
| 696 | break; |
Qu Wenruo | 5303629 | 2014-01-06 09:58:28 +0800 | [diff] [blame] | 697 | case Opt_noenospc_debug: |
| 698 | btrfs_clear_opt(info->mount_opt, ENOSPC_DEBUG); |
| 699 | break; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 700 | case Opt_defrag: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 701 | btrfs_set_and_info(root, AUTO_DEFRAG, |
| 702 | "enabling auto defrag"); |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 703 | break; |
Qu Wenruo | fc0ca9af | 2014-01-06 09:58:26 +0800 | [diff] [blame] | 704 | case Opt_nodefrag: |
Qu Wenruo | 0780253 | 2014-01-13 13:36:07 +0800 | [diff] [blame] | 705 | btrfs_clear_and_info(root, AUTO_DEFRAG, |
| 706 | "disabling auto defrag"); |
Qu Wenruo | fc0ca9af | 2014-01-06 09:58:26 +0800 | [diff] [blame] | 707 | break; |
Chris Mason | af31f5e | 2011-11-03 15:17:42 -0400 | [diff] [blame] | 708 | case Opt_recovery: |
Qu Wenruo | 8dcddfa | 2016-01-19 10:23:02 +0800 | [diff] [blame] | 709 | btrfs_warn(root->fs_info, |
| 710 | "'recovery' is deprecated, use 'usebackuproot' instead"); |
| 711 | case Opt_usebackuproot: |
| 712 | btrfs_info(root->fs_info, |
| 713 | "trying to use backup root at mount time"); |
| 714 | btrfs_set_opt(info->mount_opt, USEBACKUPROOT); |
Chris Mason | af31f5e | 2011-11-03 15:17:42 -0400 | [diff] [blame] | 715 | break; |
Ilya Dryomov | 9555c6c | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 716 | case Opt_skip_balance: |
| 717 | btrfs_set_opt(info->mount_opt, SKIP_BALANCE); |
| 718 | break; |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 719 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
| 720 | case Opt_check_integrity_including_extent_data: |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 721 | btrfs_info(root->fs_info, |
| 722 | "enabling check integrity including extent data"); |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 723 | btrfs_set_opt(info->mount_opt, |
| 724 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA); |
| 725 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
| 726 | break; |
| 727 | case Opt_check_integrity: |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 728 | btrfs_info(root->fs_info, "enabling check integrity"); |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 729 | btrfs_set_opt(info->mount_opt, CHECK_INTEGRITY); |
| 730 | break; |
| 731 | case Opt_check_integrity_print_mask: |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 732 | ret = match_int(&args[0], &intarg); |
| 733 | if (ret) { |
| 734 | goto out; |
| 735 | } else if (intarg >= 0) { |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 736 | info->check_integrity_print_mask = intarg; |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 737 | btrfs_info(root->fs_info, "check_integrity_print_mask 0x%x", |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 738 | info->check_integrity_print_mask); |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 739 | } else { |
| 740 | ret = -EINVAL; |
| 741 | goto out; |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 742 | } |
| 743 | break; |
| 744 | #else |
| 745 | case Opt_check_integrity_including_extent_data: |
| 746 | case Opt_check_integrity: |
| 747 | case Opt_check_integrity_print_mask: |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 748 | btrfs_err(root->fs_info, |
| 749 | "support for check_integrity* not compiled in!"); |
Stefan Behrens | 21adbd5 | 2011-11-09 13:44:05 +0100 | [diff] [blame] | 750 | ret = -EINVAL; |
| 751 | goto out; |
| 752 | #endif |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 753 | case Opt_fatal_errors: |
| 754 | if (strcmp(args[0].from, "panic") == 0) |
| 755 | btrfs_set_opt(info->mount_opt, |
| 756 | PANIC_ON_FATAL_ERROR); |
| 757 | else if (strcmp(args[0].from, "bug") == 0) |
| 758 | btrfs_clear_opt(info->mount_opt, |
| 759 | PANIC_ON_FATAL_ERROR); |
| 760 | else { |
| 761 | ret = -EINVAL; |
| 762 | goto out; |
| 763 | } |
| 764 | break; |
David Sterba | 8b87dc1 | 2013-08-01 18:14:52 +0200 | [diff] [blame] | 765 | case Opt_commit_interval: |
| 766 | intarg = 0; |
| 767 | ret = match_int(&args[0], &intarg); |
| 768 | if (ret < 0) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 769 | btrfs_err(root->fs_info, "invalid commit interval"); |
David Sterba | 8b87dc1 | 2013-08-01 18:14:52 +0200 | [diff] [blame] | 770 | ret = -EINVAL; |
| 771 | goto out; |
| 772 | } |
| 773 | if (intarg > 0) { |
| 774 | if (intarg > 300) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 775 | btrfs_warn(root->fs_info, "excessive commit interval %d", |
David Sterba | 8b87dc1 | 2013-08-01 18:14:52 +0200 | [diff] [blame] | 776 | intarg); |
| 777 | } |
| 778 | info->commit_interval = intarg; |
| 779 | } else { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 780 | btrfs_info(root->fs_info, "using default commit interval %ds", |
David Sterba | 8b87dc1 | 2013-08-01 18:14:52 +0200 | [diff] [blame] | 781 | BTRFS_DEFAULT_COMMIT_INTERVAL); |
| 782 | info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; |
| 783 | } |
| 784 | break; |
Josef Bacik | d0bd456 | 2015-09-23 14:54:14 -0400 | [diff] [blame] | 785 | #ifdef CONFIG_BTRFS_DEBUG |
| 786 | case Opt_fragment_all: |
| 787 | btrfs_info(root->fs_info, "fragmenting all space"); |
| 788 | btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); |
| 789 | btrfs_set_opt(info->mount_opt, FRAGMENT_METADATA); |
| 790 | break; |
| 791 | case Opt_fragment_metadata: |
| 792 | btrfs_info(root->fs_info, "fragmenting metadata"); |
| 793 | btrfs_set_opt(info->mount_opt, |
| 794 | FRAGMENT_METADATA); |
| 795 | break; |
| 796 | case Opt_fragment_data: |
| 797 | btrfs_info(root->fs_info, "fragmenting data"); |
| 798 | btrfs_set_opt(info->mount_opt, FRAGMENT_DATA); |
| 799 | break; |
| 800 | #endif |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 801 | case Opt_err: |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 802 | btrfs_info(root->fs_info, "unrecognized mount option '%s'", p); |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 803 | ret = -EINVAL; |
| 804 | goto out; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 805 | default: |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 806 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 807 | } |
| 808 | } |
Qu Wenruo | 96da091 | 2016-01-19 10:23:03 +0800 | [diff] [blame] | 809 | check: |
| 810 | /* |
| 811 | * Extra check for current option against current flag |
| 812 | */ |
| 813 | if (btrfs_test_opt(root, NOLOGREPLAY) && !(new_flags & MS_RDONLY)) { |
| 814 | btrfs_err(root->fs_info, |
| 815 | "nologreplay must be used with ro mount option"); |
| 816 | ret = -EINVAL; |
| 817 | } |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 818 | out: |
Omar Sandoval | 70f6d82 | 2015-09-29 20:50:38 -0700 | [diff] [blame] | 819 | if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE) && |
| 820 | !btrfs_test_opt(root, FREE_SPACE_TREE) && |
| 821 | !btrfs_test_opt(root, CLEAR_CACHE)) { |
| 822 | btrfs_err(root->fs_info, "cannot disable free space tree"); |
| 823 | ret = -EINVAL; |
| 824 | |
| 825 | } |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 826 | if (!ret && btrfs_test_opt(root, SPACE_CACHE)) |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 827 | btrfs_info(root->fs_info, "disk space caching is enabled"); |
Omar Sandoval | 70f6d82 | 2015-09-29 20:50:38 -0700 | [diff] [blame] | 828 | if (!ret && btrfs_test_opt(root, FREE_SPACE_TREE)) |
| 829 | btrfs_info(root->fs_info, "using free space tree"); |
Josef Bacik | da495ec | 2010-02-25 20:38:35 +0000 | [diff] [blame] | 830 | kfree(orig); |
Sage Weil | a7a3f7c | 2009-11-07 06:19:16 +0000 | [diff] [blame] | 831 | return ret; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 832 | } |
| 833 | |
| 834 | /* |
| 835 | * Parse mount options that are required early in the mount process. |
| 836 | * |
| 837 | * All other options will be parsed on much later in the mount process and |
| 838 | * only when we need to allocate a new super block. |
| 839 | */ |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 840 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 841 | void *holder, char **subvol_name, u64 *subvol_objectid, |
David Sterba | 5e2a4b2 | 2013-03-20 13:21:10 +0000 | [diff] [blame] | 842 | struct btrfs_fs_devices **fs_devices) |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 843 | { |
| 844 | substring_t args[MAX_OPT_ARGS]; |
Jeff Liu | 83c8c9b | 2011-09-14 14:11:21 +0800 | [diff] [blame] | 845 | char *device_name, *opts, *orig, *p; |
Wang Shilong | 1493381 | 2013-07-24 10:29:20 +0800 | [diff] [blame] | 846 | char *num = NULL; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 847 | int error = 0; |
| 848 | |
| 849 | if (!options) |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 850 | return 0; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 851 | |
| 852 | /* |
| 853 | * strsep changes the string, duplicate it because parse_options |
| 854 | * gets called twice |
| 855 | */ |
| 856 | opts = kstrdup(options, GFP_KERNEL); |
| 857 | if (!opts) |
| 858 | return -ENOMEM; |
Tero Roponen | 3f3d0bc | 2010-12-27 16:43:13 +0800 | [diff] [blame] | 859 | orig = opts; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 860 | |
| 861 | while ((p = strsep(&opts, ",")) != NULL) { |
| 862 | int token; |
| 863 | if (!*p) |
| 864 | continue; |
| 865 | |
| 866 | token = match_token(p, tokens, args); |
| 867 | switch (token) { |
| 868 | case Opt_subvol: |
Ilya Dryomov | a90e8b6 | 2011-11-08 16:47:55 +0200 | [diff] [blame] | 869 | kfree(*subvol_name); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 870 | *subvol_name = match_strdup(&args[0]); |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 871 | if (!*subvol_name) { |
| 872 | error = -ENOMEM; |
| 873 | goto out; |
| 874 | } |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 875 | break; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 876 | case Opt_subvolid: |
Wang Shilong | 1493381 | 2013-07-24 10:29:20 +0800 | [diff] [blame] | 877 | num = match_strdup(&args[0]); |
| 878 | if (num) { |
| 879 | *subvol_objectid = memparse(num, NULL); |
| 880 | kfree(num); |
Josef Bacik | 4849f01d | 2009-12-14 19:18:38 +0000 | [diff] [blame] | 881 | /* we want the original fs_tree */ |
Wang Shilong | 1493381 | 2013-07-24 10:29:20 +0800 | [diff] [blame] | 882 | if (!*subvol_objectid) |
Josef Bacik | 4849f01d | 2009-12-14 19:18:38 +0000 | [diff] [blame] | 883 | *subvol_objectid = |
| 884 | BTRFS_FS_TREE_OBJECTID; |
Wang Shilong | 2c334e8 | 2013-07-24 10:29:05 +0800 | [diff] [blame] | 885 | } else { |
| 886 | error = -EINVAL; |
| 887 | goto out; |
Josef Bacik | 4849f01d | 2009-12-14 19:18:38 +0000 | [diff] [blame] | 888 | } |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 889 | break; |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 890 | case Opt_subvolrootid: |
David Sterba | 5e2a4b2 | 2013-03-20 13:21:10 +0000 | [diff] [blame] | 891 | printk(KERN_WARNING |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 892 | "BTRFS: 'subvolrootid' mount option is deprecated and has " |
| 893 | "no effect\n"); |
Xin Zhong | e15d054 | 2011-04-06 07:33:51 +0000 | [diff] [blame] | 894 | break; |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 895 | case Opt_device: |
Jeff Liu | 83c8c9b | 2011-09-14 14:11:21 +0800 | [diff] [blame] | 896 | device_name = match_strdup(&args[0]); |
| 897 | if (!device_name) { |
| 898 | error = -ENOMEM; |
| 899 | goto out; |
| 900 | } |
| 901 | error = btrfs_scan_one_device(device_name, |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 902 | flags, holder, fs_devices); |
Jeff Liu | 83c8c9b | 2011-09-14 14:11:21 +0800 | [diff] [blame] | 903 | kfree(device_name); |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 904 | if (error) |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 905 | goto out; |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 906 | break; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 907 | default: |
| 908 | break; |
| 909 | } |
| 910 | } |
| 911 | |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 912 | out: |
Tero Roponen | 3f3d0bc | 2010-12-27 16:43:13 +0800 | [diff] [blame] | 913 | kfree(orig); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 914 | return error; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 915 | } |
| 916 | |
Omar Sandoval | 05dbe68 | 2015-05-18 02:16:30 -0700 | [diff] [blame] | 917 | static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, |
| 918 | u64 subvol_objectid) |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 919 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 920 | struct btrfs_root *root = fs_info->tree_root; |
Omar Sandoval | 05dbe68 | 2015-05-18 02:16:30 -0700 | [diff] [blame] | 921 | struct btrfs_root *fs_root; |
| 922 | struct btrfs_root_ref *root_ref; |
| 923 | struct btrfs_inode_ref *inode_ref; |
| 924 | struct btrfs_key key; |
| 925 | struct btrfs_path *path = NULL; |
| 926 | char *name = NULL, *ptr; |
| 927 | u64 dirid; |
| 928 | int len; |
| 929 | int ret; |
| 930 | |
| 931 | path = btrfs_alloc_path(); |
| 932 | if (!path) { |
| 933 | ret = -ENOMEM; |
| 934 | goto err; |
| 935 | } |
| 936 | path->leave_spinning = 1; |
| 937 | |
| 938 | name = kmalloc(PATH_MAX, GFP_NOFS); |
| 939 | if (!name) { |
| 940 | ret = -ENOMEM; |
| 941 | goto err; |
| 942 | } |
| 943 | ptr = name + PATH_MAX - 1; |
| 944 | ptr[0] = '\0'; |
| 945 | |
| 946 | /* |
| 947 | * Walk up the subvolume trees in the tree of tree roots by root |
| 948 | * backrefs until we hit the top-level subvolume. |
| 949 | */ |
| 950 | while (subvol_objectid != BTRFS_FS_TREE_OBJECTID) { |
| 951 | key.objectid = subvol_objectid; |
| 952 | key.type = BTRFS_ROOT_BACKREF_KEY; |
| 953 | key.offset = (u64)-1; |
| 954 | |
| 955 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 956 | if (ret < 0) { |
| 957 | goto err; |
| 958 | } else if (ret > 0) { |
| 959 | ret = btrfs_previous_item(root, path, subvol_objectid, |
| 960 | BTRFS_ROOT_BACKREF_KEY); |
| 961 | if (ret < 0) { |
| 962 | goto err; |
| 963 | } else if (ret > 0) { |
| 964 | ret = -ENOENT; |
| 965 | goto err; |
| 966 | } |
| 967 | } |
| 968 | |
| 969 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
| 970 | subvol_objectid = key.offset; |
| 971 | |
| 972 | root_ref = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 973 | struct btrfs_root_ref); |
| 974 | len = btrfs_root_ref_name_len(path->nodes[0], root_ref); |
| 975 | ptr -= len + 1; |
| 976 | if (ptr < name) { |
| 977 | ret = -ENAMETOOLONG; |
| 978 | goto err; |
| 979 | } |
| 980 | read_extent_buffer(path->nodes[0], ptr + 1, |
| 981 | (unsigned long)(root_ref + 1), len); |
| 982 | ptr[0] = '/'; |
| 983 | dirid = btrfs_root_ref_dirid(path->nodes[0], root_ref); |
| 984 | btrfs_release_path(path); |
| 985 | |
| 986 | key.objectid = subvol_objectid; |
| 987 | key.type = BTRFS_ROOT_ITEM_KEY; |
| 988 | key.offset = (u64)-1; |
| 989 | fs_root = btrfs_read_fs_root_no_name(fs_info, &key); |
| 990 | if (IS_ERR(fs_root)) { |
| 991 | ret = PTR_ERR(fs_root); |
| 992 | goto err; |
| 993 | } |
| 994 | |
| 995 | /* |
| 996 | * Walk up the filesystem tree by inode refs until we hit the |
| 997 | * root directory. |
| 998 | */ |
| 999 | while (dirid != BTRFS_FIRST_FREE_OBJECTID) { |
| 1000 | key.objectid = dirid; |
| 1001 | key.type = BTRFS_INODE_REF_KEY; |
| 1002 | key.offset = (u64)-1; |
| 1003 | |
| 1004 | ret = btrfs_search_slot(NULL, fs_root, &key, path, 0, 0); |
| 1005 | if (ret < 0) { |
| 1006 | goto err; |
| 1007 | } else if (ret > 0) { |
| 1008 | ret = btrfs_previous_item(fs_root, path, dirid, |
| 1009 | BTRFS_INODE_REF_KEY); |
| 1010 | if (ret < 0) { |
| 1011 | goto err; |
| 1012 | } else if (ret > 0) { |
| 1013 | ret = -ENOENT; |
| 1014 | goto err; |
| 1015 | } |
| 1016 | } |
| 1017 | |
| 1018 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
| 1019 | dirid = key.offset; |
| 1020 | |
| 1021 | inode_ref = btrfs_item_ptr(path->nodes[0], |
| 1022 | path->slots[0], |
| 1023 | struct btrfs_inode_ref); |
| 1024 | len = btrfs_inode_ref_name_len(path->nodes[0], |
| 1025 | inode_ref); |
| 1026 | ptr -= len + 1; |
| 1027 | if (ptr < name) { |
| 1028 | ret = -ENAMETOOLONG; |
| 1029 | goto err; |
| 1030 | } |
| 1031 | read_extent_buffer(path->nodes[0], ptr + 1, |
| 1032 | (unsigned long)(inode_ref + 1), len); |
| 1033 | ptr[0] = '/'; |
| 1034 | btrfs_release_path(path); |
| 1035 | } |
| 1036 | } |
| 1037 | |
| 1038 | btrfs_free_path(path); |
| 1039 | if (ptr == name + PATH_MAX - 1) { |
| 1040 | name[0] = '/'; |
| 1041 | name[1] = '\0'; |
| 1042 | } else { |
| 1043 | memmove(name, ptr, name + PATH_MAX - ptr); |
| 1044 | } |
| 1045 | return name; |
| 1046 | |
| 1047 | err: |
| 1048 | btrfs_free_path(path); |
| 1049 | kfree(name); |
| 1050 | return ERR_PTR(ret); |
| 1051 | } |
| 1052 | |
| 1053 | static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objectid) |
| 1054 | { |
| 1055 | struct btrfs_root *root = fs_info->tree_root; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 1056 | struct btrfs_dir_item *di; |
| 1057 | struct btrfs_path *path; |
| 1058 | struct btrfs_key location; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 1059 | u64 dir_id; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 1060 | |
| 1061 | path = btrfs_alloc_path(); |
| 1062 | if (!path) |
Omar Sandoval | 05dbe68 | 2015-05-18 02:16:30 -0700 | [diff] [blame] | 1063 | return -ENOMEM; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 1064 | path->leave_spinning = 1; |
| 1065 | |
| 1066 | /* |
| 1067 | * Find the "default" dir item which points to the root item that we |
| 1068 | * will mount by default if we haven't been given a specific subvolume |
| 1069 | * to mount. |
| 1070 | */ |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1071 | dir_id = btrfs_super_root_dir(fs_info->super_copy); |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 1072 | 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] | 1073 | if (IS_ERR(di)) { |
| 1074 | btrfs_free_path(path); |
Omar Sandoval | 05dbe68 | 2015-05-18 02:16:30 -0700 | [diff] [blame] | 1075 | return PTR_ERR(di); |
Julia Lawall | b083916 | 2011-05-14 07:10:51 +0000 | [diff] [blame] | 1076 | } |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 1077 | if (!di) { |
| 1078 | /* |
| 1079 | * Ok the default dir item isn't there. This is weird since |
| 1080 | * it's always been there, but don't freak out, just try and |
Omar Sandoval | 05dbe68 | 2015-05-18 02:16:30 -0700 | [diff] [blame] | 1081 | * mount the top-level subvolume. |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 1082 | */ |
| 1083 | btrfs_free_path(path); |
Omar Sandoval | 05dbe68 | 2015-05-18 02:16:30 -0700 | [diff] [blame] | 1084 | *objectid = BTRFS_FS_TREE_OBJECTID; |
| 1085 | return 0; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 1086 | } |
| 1087 | |
| 1088 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); |
| 1089 | btrfs_free_path(path); |
Omar Sandoval | 05dbe68 | 2015-05-18 02:16:30 -0700 | [diff] [blame] | 1090 | *objectid = location.objectid; |
| 1091 | return 0; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 1092 | } |
| 1093 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1094 | static int btrfs_fill_super(struct super_block *sb, |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1095 | struct btrfs_fs_devices *fs_devices, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1096 | void *data, int silent) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1097 | { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1098 | struct inode *inode; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1099 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1100 | struct btrfs_key key; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1101 | int err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1102 | |
| 1103 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1104 | sb->s_magic = BTRFS_SUPER_MAGIC; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1105 | sb->s_op = &btrfs_super_ops; |
Al Viro | af53d29 | 2010-12-20 10:56:06 -0500 | [diff] [blame] | 1106 | sb->s_d_op = &btrfs_dentry_operations; |
Balaji Rao | be6e8dc | 2008-07-21 02:01:56 +0530 | [diff] [blame] | 1107 | sb->s_export_op = &btrfs_export_ops; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 1108 | sb->s_xattr = btrfs_xattr_handlers; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1109 | sb->s_time_gran = 1; |
Chris Mason | 0eda294 | 2009-10-13 13:50:18 -0400 | [diff] [blame] | 1110 | #ifdef CONFIG_BTRFS_FS_POSIX_ACL |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 1111 | sb->s_flags |= MS_POSIXACL; |
Chris Ball | 49cf6f4 | 2009-09-29 13:51:04 -0400 | [diff] [blame] | 1112 | #endif |
Josef Bacik | 0c4d2d9 | 2012-04-05 15:03:02 -0400 | [diff] [blame] | 1113 | sb->s_flags |= MS_I_VERSION; |
Chris Mason | da2f0f7 | 2015-07-02 13:57:22 -0700 | [diff] [blame] | 1114 | sb->s_iflags |= SB_I_CGROUPWB; |
Al Viro | ad2b2c8 | 2011-11-17 01:10:02 -0500 | [diff] [blame] | 1115 | err = open_ctree(sb, fs_devices, (char *)data); |
| 1116 | if (err) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1117 | printk(KERN_ERR "BTRFS: open_ctree failed\n"); |
Al Viro | ad2b2c8 | 2011-11-17 01:10:02 -0500 | [diff] [blame] | 1118 | return err; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 1119 | } |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1120 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1121 | key.objectid = BTRFS_FIRST_FREE_OBJECTID; |
| 1122 | key.type = BTRFS_INODE_ITEM_KEY; |
| 1123 | key.offset = 0; |
Al Viro | 98c7089 | 2011-11-17 01:00:31 -0500 | [diff] [blame] | 1124 | inode = btrfs_iget(sb, &key, fs_info->fs_root, NULL); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1125 | if (IS_ERR(inode)) { |
| 1126 | err = PTR_ERR(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1127 | goto fail_close; |
| 1128 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1129 | |
Al Viro | 48fde70 | 2012-01-08 22:15:13 -0500 | [diff] [blame] | 1130 | sb->s_root = d_make_root(inode); |
| 1131 | if (!sb->s_root) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1132 | err = -ENOMEM; |
| 1133 | goto fail_close; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1134 | } |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 1135 | |
Chris Mason | 6885f30 | 2008-02-20 16:11:05 -0500 | [diff] [blame] | 1136 | save_mount_options(sb, data); |
Dan Magenheimer | 90a887c | 2011-05-26 10:01:56 -0600 | [diff] [blame] | 1137 | cleancache_init_fs(sb); |
Al Viro | 59553ed | 2011-11-17 01:56:28 -0500 | [diff] [blame] | 1138 | sb->s_flags |= MS_ACTIVE; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1139 | return 0; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1140 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 1141 | fail_close: |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1142 | close_ctree(fs_info->tree_root); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1143 | return err; |
| 1144 | } |
| 1145 | |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 1146 | int btrfs_sync_fs(struct super_block *sb, int wait) |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1147 | { |
| 1148 | struct btrfs_trans_handle *trans; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1149 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
| 1150 | struct btrfs_root *root = fs_info->tree_root; |
Chris Mason | df2ce34 | 2007-03-23 11:00:45 -0400 | [diff] [blame] | 1151 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 1152 | trace_btrfs_sync_fs(wait); |
| 1153 | |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 1154 | if (!wait) { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1155 | filemap_flush(fs_info->btree_inode->i_mapping); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 1156 | return 0; |
| 1157 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1158 | |
Miao Xie | b024419 | 2013-11-04 23:13:25 +0800 | [diff] [blame] | 1159 | btrfs_wait_ordered_roots(fs_info, -1); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1160 | |
Miao Xie | d4edf39 | 2013-02-20 09:17:06 +0000 | [diff] [blame] | 1161 | trans = btrfs_attach_transaction_barrier(root); |
Josef Bacik | 60376ce | 2012-09-14 10:34:40 -0400 | [diff] [blame] | 1162 | if (IS_ERR(trans)) { |
Miao Xie | 354aa0f | 2012-09-20 01:54:00 -0600 | [diff] [blame] | 1163 | /* no transaction, don't bother */ |
David Sterba | 6b5fe46 | 2014-03-28 17:38:48 +0100 | [diff] [blame] | 1164 | if (PTR_ERR(trans) == -ENOENT) { |
| 1165 | /* |
| 1166 | * Exit unless we have some pending changes |
| 1167 | * that need to go through commit |
| 1168 | */ |
| 1169 | if (fs_info->pending_changes == 0) |
| 1170 | return 0; |
Qu Wenruo | a53f4f8 | 2015-01-19 15:42:41 +0800 | [diff] [blame] | 1171 | /* |
| 1172 | * A non-blocking test if the fs is frozen. We must not |
| 1173 | * start a new transaction here otherwise a deadlock |
| 1174 | * happens. The pending operations are delayed to the |
| 1175 | * next commit after thawing. |
| 1176 | */ |
| 1177 | if (__sb_start_write(sb, SB_FREEZE_WRITE, false)) |
| 1178 | __sb_end_write(sb, SB_FREEZE_WRITE); |
| 1179 | else |
| 1180 | return 0; |
David Sterba | 6b5fe46 | 2014-03-28 17:38:48 +0100 | [diff] [blame] | 1181 | trans = btrfs_start_transaction(root, 0); |
David Sterba | 6b5fe46 | 2014-03-28 17:38:48 +0100 | [diff] [blame] | 1182 | } |
David Sterba | 98bd5c5 | 2015-01-19 14:21:02 +0100 | [diff] [blame] | 1183 | if (IS_ERR(trans)) |
| 1184 | return PTR_ERR(trans); |
Josef Bacik | 60376ce | 2012-09-14 10:34:40 -0400 | [diff] [blame] | 1185 | } |
Josef Bacik | bd7de2c | 2012-08-24 12:53:03 -0600 | [diff] [blame] | 1186 | return btrfs_commit_transaction(trans, root); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 1187 | } |
| 1188 | |
Al Viro | 34c80b1 | 2011-12-08 21:32:45 -0500 | [diff] [blame] | 1189 | static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 1190 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1191 | struct btrfs_fs_info *info = btrfs_sb(dentry->d_sb); |
| 1192 | struct btrfs_root *root = info->tree_root; |
Tsutomu Itoh | 200da64 | 2011-03-31 00:44:29 +0000 | [diff] [blame] | 1193 | char *compress_type; |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 1194 | |
| 1195 | if (btrfs_test_opt(root, DEGRADED)) |
| 1196 | seq_puts(seq, ",degraded"); |
| 1197 | if (btrfs_test_opt(root, NODATASUM)) |
| 1198 | seq_puts(seq, ",nodatasum"); |
| 1199 | if (btrfs_test_opt(root, NODATACOW)) |
| 1200 | seq_puts(seq, ",nodatacow"); |
| 1201 | if (btrfs_test_opt(root, NOBARRIER)) |
| 1202 | seq_puts(seq, ",nobarrier"); |
Filipe David Borba Manana | 95ac567 | 2013-08-08 22:45:48 +0100 | [diff] [blame] | 1203 | if (info->max_inline != BTRFS_DEFAULT_MAX_INLINE) |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 1204 | seq_printf(seq, ",max_inline=%llu", info->max_inline); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 1205 | if (info->alloc_start != 0) |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 1206 | seq_printf(seq, ",alloc_start=%llu", info->alloc_start); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 1207 | if (info->thread_pool_size != min_t(unsigned long, |
| 1208 | num_online_cpus() + 2, 8)) |
| 1209 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); |
Tsutomu Itoh | 200da64 | 2011-03-31 00:44:29 +0000 | [diff] [blame] | 1210 | if (btrfs_test_opt(root, COMPRESS)) { |
| 1211 | if (info->compress_type == BTRFS_COMPRESS_ZLIB) |
| 1212 | compress_type = "zlib"; |
| 1213 | else |
| 1214 | compress_type = "lzo"; |
| 1215 | if (btrfs_test_opt(root, FORCE_COMPRESS)) |
| 1216 | seq_printf(seq, ",compress-force=%s", compress_type); |
| 1217 | else |
| 1218 | seq_printf(seq, ",compress=%s", compress_type); |
| 1219 | } |
Chris Mason | c289811 | 2009-06-10 09:51:32 -0400 | [diff] [blame] | 1220 | if (btrfs_test_opt(root, NOSSD)) |
| 1221 | seq_puts(seq, ",nossd"); |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 1222 | if (btrfs_test_opt(root, SSD_SPREAD)) |
| 1223 | seq_puts(seq, ",ssd_spread"); |
| 1224 | else if (btrfs_test_opt(root, SSD)) |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 1225 | seq_puts(seq, ",ssd"); |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 1226 | if (btrfs_test_opt(root, NOTREELOG)) |
Sage Weil | 6b65c5c | 2009-05-14 13:52:21 -0400 | [diff] [blame] | 1227 | seq_puts(seq, ",notreelog"); |
Qu Wenruo | 96da091 | 2016-01-19 10:23:03 +0800 | [diff] [blame] | 1228 | if (btrfs_test_opt(root, NOLOGREPLAY)) |
| 1229 | seq_puts(seq, ",nologreplay"); |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 1230 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
Sage Weil | 6b65c5c | 2009-05-14 13:52:21 -0400 | [diff] [blame] | 1231 | seq_puts(seq, ",flushoncommit"); |
Matthew Wilcox | 20a5239 | 2009-12-14 22:01:12 +0000 | [diff] [blame] | 1232 | if (btrfs_test_opt(root, DISCARD)) |
| 1233 | seq_puts(seq, ",discard"); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 1234 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
| 1235 | seq_puts(seq, ",noacl"); |
Tsutomu Itoh | 200da64 | 2011-03-31 00:44:29 +0000 | [diff] [blame] | 1236 | if (btrfs_test_opt(root, SPACE_CACHE)) |
| 1237 | seq_puts(seq, ",space_cache"); |
Omar Sandoval | 70f6d82 | 2015-09-29 20:50:38 -0700 | [diff] [blame] | 1238 | else if (btrfs_test_opt(root, FREE_SPACE_TREE)) |
| 1239 | seq_puts(seq, ",space_cache=v2"); |
Josef Bacik | 73bc187 | 2011-10-03 14:07:49 -0400 | [diff] [blame] | 1240 | else |
David Sterba | 8965593 | 2011-11-11 10:14:57 -0500 | [diff] [blame] | 1241 | seq_puts(seq, ",nospace_cache"); |
Stefan Behrens | f420ee1 | 2013-08-15 17:11:24 +0200 | [diff] [blame] | 1242 | if (btrfs_test_opt(root, RESCAN_UUID_TREE)) |
| 1243 | seq_puts(seq, ",rescan_uuid_tree"); |
Tsutomu Itoh | 200da64 | 2011-03-31 00:44:29 +0000 | [diff] [blame] | 1244 | if (btrfs_test_opt(root, CLEAR_CACHE)) |
| 1245 | seq_puts(seq, ",clear_cache"); |
| 1246 | if (btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) |
| 1247 | seq_puts(seq, ",user_subvol_rm_allowed"); |
David Sterba | 0942caa | 2011-06-28 15:10:37 +0000 | [diff] [blame] | 1248 | if (btrfs_test_opt(root, ENOSPC_DEBUG)) |
| 1249 | seq_puts(seq, ",enospc_debug"); |
| 1250 | if (btrfs_test_opt(root, AUTO_DEFRAG)) |
| 1251 | seq_puts(seq, ",autodefrag"); |
| 1252 | if (btrfs_test_opt(root, INODE_MAP_CACHE)) |
| 1253 | seq_puts(seq, ",inode_cache"); |
Ilya Dryomov | 9555c6c | 2012-01-16 22:04:48 +0200 | [diff] [blame] | 1254 | if (btrfs_test_opt(root, SKIP_BALANCE)) |
| 1255 | seq_puts(seq, ",skip_balance"); |
Wang Shilong | 8507d21 | 2013-07-24 10:30:02 +0800 | [diff] [blame] | 1256 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
| 1257 | if (btrfs_test_opt(root, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) |
| 1258 | seq_puts(seq, ",check_int_data"); |
| 1259 | else if (btrfs_test_opt(root, CHECK_INTEGRITY)) |
| 1260 | seq_puts(seq, ",check_int"); |
| 1261 | if (info->check_integrity_print_mask) |
| 1262 | seq_printf(seq, ",check_int_print_mask=%d", |
| 1263 | info->check_integrity_print_mask); |
| 1264 | #endif |
| 1265 | if (info->metadata_ratio) |
| 1266 | seq_printf(seq, ",metadata_ratio=%d", |
| 1267 | info->metadata_ratio); |
Jeff Mahoney | 8c34293 | 2011-10-03 23:22:31 -0400 | [diff] [blame] | 1268 | if (btrfs_test_opt(root, PANIC_ON_FATAL_ERROR)) |
| 1269 | seq_puts(seq, ",fatal_errors=panic"); |
David Sterba | 8b87dc1 | 2013-08-01 18:14:52 +0200 | [diff] [blame] | 1270 | if (info->commit_interval != BTRFS_DEFAULT_COMMIT_INTERVAL) |
| 1271 | seq_printf(seq, ",commit=%d", info->commit_interval); |
Josef Bacik | d0bd456 | 2015-09-23 14:54:14 -0400 | [diff] [blame] | 1272 | #ifdef CONFIG_BTRFS_DEBUG |
| 1273 | if (btrfs_test_opt(root, FRAGMENT_DATA)) |
| 1274 | seq_puts(seq, ",fragment=data"); |
| 1275 | if (btrfs_test_opt(root, FRAGMENT_METADATA)) |
| 1276 | seq_puts(seq, ",fragment=metadata"); |
| 1277 | #endif |
Omar Sandoval | c8d3fe0 | 2015-05-18 02:16:31 -0700 | [diff] [blame] | 1278 | seq_printf(seq, ",subvolid=%llu", |
| 1279 | BTRFS_I(d_inode(dentry))->root->root_key.objectid); |
| 1280 | seq_puts(seq, ",subvol="); |
| 1281 | seq_dentry(seq, dentry, " \t\n\\"); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 1282 | return 0; |
| 1283 | } |
| 1284 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1285 | static int btrfs_test_super(struct super_block *s, void *data) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1286 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1287 | struct btrfs_fs_info *p = data; |
| 1288 | struct btrfs_fs_info *fs_info = btrfs_sb(s); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1289 | |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1290 | return fs_info->fs_devices == p->fs_devices; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1291 | } |
| 1292 | |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1293 | static int btrfs_set_super(struct super_block *s, void *data) |
| 1294 | { |
Al Viro | 6de1d09 | 2011-11-17 01:29:09 -0500 | [diff] [blame] | 1295 | int err = set_anon_super(s, data); |
| 1296 | if (!err) |
| 1297 | s->s_fs_info = data; |
| 1298 | return err; |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1299 | } |
| 1300 | |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1301 | /* |
David Sterba | f9d9ef6 | 2011-09-29 13:11:33 +0200 | [diff] [blame] | 1302 | * subvolumes are identified by ino 256 |
| 1303 | */ |
| 1304 | static inline int is_subvolume_inode(struct inode *inode) |
| 1305 | { |
| 1306 | if (inode && inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) |
| 1307 | return 1; |
| 1308 | return 0; |
| 1309 | } |
| 1310 | |
| 1311 | /* |
Omar Sandoval | e6e4dbe | 2015-05-18 02:16:27 -0700 | [diff] [blame] | 1312 | * This will add subvolid=0 to the argument string while removing any subvol= |
| 1313 | * and subvolid= arguments to make sure we get the top-level root for path |
| 1314 | * walking to the subvol we want. |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1315 | */ |
| 1316 | static char *setup_root_args(char *args) |
| 1317 | { |
Omar Sandoval | e6e4dbe | 2015-05-18 02:16:27 -0700 | [diff] [blame] | 1318 | char *buf, *dst, *sep; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1319 | |
Omar Sandoval | e6e4dbe | 2015-05-18 02:16:27 -0700 | [diff] [blame] | 1320 | if (!args) |
| 1321 | return kstrdup("subvolid=0", GFP_NOFS); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1322 | |
Omar Sandoval | e6e4dbe | 2015-05-18 02:16:27 -0700 | [diff] [blame] | 1323 | /* The worst case is that we add ",subvolid=0" to the end. */ |
| 1324 | buf = dst = kmalloc(strlen(args) + strlen(",subvolid=0") + 1, GFP_NOFS); |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 1325 | if (!buf) |
| 1326 | return NULL; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1327 | |
Omar Sandoval | e6e4dbe | 2015-05-18 02:16:27 -0700 | [diff] [blame] | 1328 | while (1) { |
| 1329 | sep = strchrnul(args, ','); |
| 1330 | if (!strstarts(args, "subvol=") && |
| 1331 | !strstarts(args, "subvolid=")) { |
| 1332 | memcpy(dst, args, sep - args); |
| 1333 | dst += sep - args; |
| 1334 | *dst++ = ','; |
| 1335 | } |
| 1336 | if (*sep) |
| 1337 | args = sep + 1; |
| 1338 | else |
| 1339 | break; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1340 | } |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 1341 | strcpy(dst, "subvolid=0"); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1342 | |
Jim Meyering | f60d16a | 2012-04-25 21:24:17 +0200 | [diff] [blame] | 1343 | return buf; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1344 | } |
| 1345 | |
Omar Sandoval | bb289b7 | 2015-05-18 02:16:29 -0700 | [diff] [blame] | 1346 | static struct dentry *mount_subvol(const char *subvol_name, u64 subvol_objectid, |
| 1347 | int flags, const char *device_name, |
| 1348 | char *data) |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1349 | { |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1350 | struct dentry *root; |
Omar Sandoval | fa33065 | 2015-05-18 02:16:28 -0700 | [diff] [blame] | 1351 | struct vfsmount *mnt = NULL; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1352 | char *newargs; |
Omar Sandoval | fa33065 | 2015-05-18 02:16:28 -0700 | [diff] [blame] | 1353 | int ret; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1354 | |
| 1355 | newargs = setup_root_args(data); |
Omar Sandoval | fa33065 | 2015-05-18 02:16:28 -0700 | [diff] [blame] | 1356 | if (!newargs) { |
| 1357 | root = ERR_PTR(-ENOMEM); |
| 1358 | goto out; |
| 1359 | } |
Harald Hoyer | 0723a04 | 2013-11-19 11:36:05 +0100 | [diff] [blame] | 1360 | |
Omar Sandoval | fa33065 | 2015-05-18 02:16:28 -0700 | [diff] [blame] | 1361 | mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name, newargs); |
| 1362 | if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) { |
Harald Hoyer | 0723a04 | 2013-11-19 11:36:05 +0100 | [diff] [blame] | 1363 | if (flags & MS_RDONLY) { |
Omar Sandoval | fa33065 | 2015-05-18 02:16:28 -0700 | [diff] [blame] | 1364 | mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY, |
| 1365 | device_name, newargs); |
Harald Hoyer | 0723a04 | 2013-11-19 11:36:05 +0100 | [diff] [blame] | 1366 | } else { |
Omar Sandoval | fa33065 | 2015-05-18 02:16:28 -0700 | [diff] [blame] | 1367 | mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY, |
| 1368 | device_name, newargs); |
Christoph Jaeger | 0040e60 | 2014-04-12 13:33:13 +0200 | [diff] [blame] | 1369 | if (IS_ERR(mnt)) { |
Omar Sandoval | fa33065 | 2015-05-18 02:16:28 -0700 | [diff] [blame] | 1370 | root = ERR_CAST(mnt); |
| 1371 | mnt = NULL; |
| 1372 | goto out; |
Christoph Jaeger | 0040e60 | 2014-04-12 13:33:13 +0200 | [diff] [blame] | 1373 | } |
Harald Hoyer | 0723a04 | 2013-11-19 11:36:05 +0100 | [diff] [blame] | 1374 | |
Omar Sandoval | 773cd04 | 2015-05-18 02:16:26 -0700 | [diff] [blame] | 1375 | down_write(&mnt->mnt_sb->s_umount); |
Omar Sandoval | fa33065 | 2015-05-18 02:16:28 -0700 | [diff] [blame] | 1376 | ret = btrfs_remount(mnt->mnt_sb, &flags, NULL); |
Omar Sandoval | 773cd04 | 2015-05-18 02:16:26 -0700 | [diff] [blame] | 1377 | up_write(&mnt->mnt_sb->s_umount); |
Omar Sandoval | fa33065 | 2015-05-18 02:16:28 -0700 | [diff] [blame] | 1378 | if (ret < 0) { |
| 1379 | root = ERR_PTR(ret); |
| 1380 | goto out; |
Harald Hoyer | 0723a04 | 2013-11-19 11:36:05 +0100 | [diff] [blame] | 1381 | } |
| 1382 | } |
| 1383 | } |
Omar Sandoval | fa33065 | 2015-05-18 02:16:28 -0700 | [diff] [blame] | 1384 | if (IS_ERR(mnt)) { |
| 1385 | root = ERR_CAST(mnt); |
| 1386 | mnt = NULL; |
| 1387 | goto out; |
| 1388 | } |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1389 | |
Omar Sandoval | 05dbe68 | 2015-05-18 02:16:30 -0700 | [diff] [blame] | 1390 | if (!subvol_name) { |
| 1391 | if (!subvol_objectid) { |
| 1392 | ret = get_default_subvol_objectid(btrfs_sb(mnt->mnt_sb), |
| 1393 | &subvol_objectid); |
| 1394 | if (ret) { |
| 1395 | root = ERR_PTR(ret); |
| 1396 | goto out; |
| 1397 | } |
| 1398 | } |
| 1399 | subvol_name = get_subvol_name_from_objectid(btrfs_sb(mnt->mnt_sb), |
| 1400 | subvol_objectid); |
| 1401 | if (IS_ERR(subvol_name)) { |
| 1402 | root = ERR_CAST(subvol_name); |
| 1403 | subvol_name = NULL; |
| 1404 | goto out; |
| 1405 | } |
| 1406 | |
| 1407 | } |
| 1408 | |
Al Viro | ea441d1 | 2011-11-16 21:43:59 -0500 | [diff] [blame] | 1409 | root = mount_subtree(mnt, subvol_name); |
Omar Sandoval | fa33065 | 2015-05-18 02:16:28 -0700 | [diff] [blame] | 1410 | /* mount_subtree() drops our reference on the vfsmount. */ |
| 1411 | mnt = NULL; |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1412 | |
Omar Sandoval | bb289b7 | 2015-05-18 02:16:29 -0700 | [diff] [blame] | 1413 | if (!IS_ERR(root)) { |
Al Viro | ea441d1 | 2011-11-16 21:43:59 -0500 | [diff] [blame] | 1414 | struct super_block *s = root->d_sb; |
Omar Sandoval | bb289b7 | 2015-05-18 02:16:29 -0700 | [diff] [blame] | 1415 | struct inode *root_inode = d_inode(root); |
| 1416 | u64 root_objectid = BTRFS_I(root_inode)->root->root_key.objectid; |
| 1417 | |
| 1418 | ret = 0; |
| 1419 | if (!is_subvolume_inode(root_inode)) { |
| 1420 | pr_err("BTRFS: '%s' is not a valid subvolume\n", |
| 1421 | subvol_name); |
| 1422 | ret = -EINVAL; |
| 1423 | } |
| 1424 | if (subvol_objectid && root_objectid != subvol_objectid) { |
Omar Sandoval | 05dbe68 | 2015-05-18 02:16:30 -0700 | [diff] [blame] | 1425 | /* |
| 1426 | * This will also catch a race condition where a |
| 1427 | * subvolume which was passed by ID is renamed and |
| 1428 | * another subvolume is renamed over the old location. |
| 1429 | */ |
Omar Sandoval | bb289b7 | 2015-05-18 02:16:29 -0700 | [diff] [blame] | 1430 | pr_err("BTRFS: subvol '%s' does not match subvolid %llu\n", |
| 1431 | subvol_name, subvol_objectid); |
| 1432 | ret = -EINVAL; |
| 1433 | } |
| 1434 | if (ret) { |
| 1435 | dput(root); |
| 1436 | root = ERR_PTR(ret); |
| 1437 | deactivate_locked_super(s); |
| 1438 | } |
David Sterba | f9d9ef6 | 2011-09-29 13:11:33 +0200 | [diff] [blame] | 1439 | } |
| 1440 | |
Omar Sandoval | fa33065 | 2015-05-18 02:16:28 -0700 | [diff] [blame] | 1441 | out: |
| 1442 | mntput(mnt); |
| 1443 | kfree(newargs); |
| 1444 | kfree(subvol_name); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1445 | return root; |
| 1446 | } |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1447 | |
Qu Wenruo | f667aef | 2014-09-23 13:40:08 +0800 | [diff] [blame] | 1448 | static int parse_security_options(char *orig_opts, |
| 1449 | struct security_mnt_opts *sec_opts) |
| 1450 | { |
| 1451 | char *secdata = NULL; |
| 1452 | int ret = 0; |
| 1453 | |
| 1454 | secdata = alloc_secdata(); |
| 1455 | if (!secdata) |
| 1456 | return -ENOMEM; |
| 1457 | ret = security_sb_copy_data(orig_opts, secdata); |
| 1458 | if (ret) { |
| 1459 | free_secdata(secdata); |
| 1460 | return ret; |
| 1461 | } |
| 1462 | ret = security_sb_parse_opts_str(secdata, sec_opts); |
| 1463 | free_secdata(secdata); |
| 1464 | return ret; |
| 1465 | } |
| 1466 | |
| 1467 | static int setup_security_options(struct btrfs_fs_info *fs_info, |
| 1468 | struct super_block *sb, |
| 1469 | struct security_mnt_opts *sec_opts) |
| 1470 | { |
| 1471 | int ret = 0; |
| 1472 | |
| 1473 | /* |
| 1474 | * Call security_sb_set_mnt_opts() to check whether new sec_opts |
| 1475 | * is valid. |
| 1476 | */ |
| 1477 | ret = security_sb_set_mnt_opts(sb, sec_opts, 0, NULL); |
| 1478 | if (ret) |
| 1479 | return ret; |
| 1480 | |
Qu Wenruo | a43bb39 | 2014-10-08 10:19:08 +0800 | [diff] [blame] | 1481 | #ifdef CONFIG_SECURITY |
Qu Wenruo | f667aef | 2014-09-23 13:40:08 +0800 | [diff] [blame] | 1482 | if (!fs_info->security_opts.num_mnt_opts) { |
| 1483 | /* first time security setup, copy sec_opts to fs_info */ |
| 1484 | memcpy(&fs_info->security_opts, sec_opts, sizeof(*sec_opts)); |
| 1485 | } else { |
| 1486 | /* |
Luis de Bethencourt | 180e4d4 | 2016-04-04 15:31:22 +0100 | [diff] [blame^] | 1487 | * Since SELinux (the only one supporting security_mnt_opts) |
| 1488 | * does NOT support changing context during remount/mount of |
| 1489 | * the same sb, this must be the same or part of the same |
| 1490 | * security options, just free it. |
Qu Wenruo | f667aef | 2014-09-23 13:40:08 +0800 | [diff] [blame] | 1491 | */ |
| 1492 | security_free_mnt_opts(sec_opts); |
| 1493 | } |
Qu Wenruo | a43bb39 | 2014-10-08 10:19:08 +0800 | [diff] [blame] | 1494 | #endif |
Qu Wenruo | f667aef | 2014-09-23 13:40:08 +0800 | [diff] [blame] | 1495 | return ret; |
| 1496 | } |
| 1497 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 1498 | /* |
| 1499 | * Find a superblock for the given device / mount point. |
| 1500 | * |
| 1501 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions |
| 1502 | * for multiple device setup. Make sure to keep it in sync. |
| 1503 | */ |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 1504 | 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] | 1505 | const char *device_name, void *data) |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1506 | { |
| 1507 | struct block_device *bdev = NULL; |
| 1508 | struct super_block *s; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1509 | struct btrfs_fs_devices *fs_devices = NULL; |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1510 | struct btrfs_fs_info *fs_info = NULL; |
Qu Wenruo | f667aef | 2014-09-23 13:40:08 +0800 | [diff] [blame] | 1511 | struct security_mnt_opts new_sec_opts; |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 1512 | fmode_t mode = FMODE_READ; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 1513 | char *subvol_name = NULL; |
| 1514 | u64 subvol_objectid = 0; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1515 | int error = 0; |
| 1516 | |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 1517 | if (!(flags & MS_RDONLY)) |
| 1518 | mode |= FMODE_WRITE; |
| 1519 | |
| 1520 | error = btrfs_parse_early_options(data, mode, fs_type, |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 1521 | &subvol_name, &subvol_objectid, |
David Sterba | 5e2a4b2 | 2013-03-20 13:21:10 +0000 | [diff] [blame] | 1522 | &fs_devices); |
Ilya Dryomov | f23c8af | 2011-11-08 19:15:05 +0200 | [diff] [blame] | 1523 | if (error) { |
| 1524 | kfree(subvol_name); |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 1525 | return ERR_PTR(error); |
Ilya Dryomov | f23c8af | 2011-11-08 19:15:05 +0200 | [diff] [blame] | 1526 | } |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 1527 | |
Omar Sandoval | 05dbe68 | 2015-05-18 02:16:30 -0700 | [diff] [blame] | 1528 | if (subvol_name || subvol_objectid != BTRFS_FS_TREE_OBJECTID) { |
Omar Sandoval | fa33065 | 2015-05-18 02:16:28 -0700 | [diff] [blame] | 1529 | /* mount_subvol() will free subvol_name. */ |
Omar Sandoval | bb289b7 | 2015-05-18 02:16:29 -0700 | [diff] [blame] | 1530 | return mount_subvol(subvol_name, subvol_objectid, flags, |
| 1531 | device_name, data); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1532 | } |
| 1533 | |
Qu Wenruo | f667aef | 2014-09-23 13:40:08 +0800 | [diff] [blame] | 1534 | security_init_mnt_opts(&new_sec_opts); |
| 1535 | if (data) { |
| 1536 | error = parse_security_options(data, &new_sec_opts); |
| 1537 | if (error) |
| 1538 | return ERR_PTR(error); |
| 1539 | } |
| 1540 | |
David Sterba | 306e16c | 2011-04-19 14:29:38 +0200 | [diff] [blame] | 1541 | error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1542 | if (error) |
Qu Wenruo | f667aef | 2014-09-23 13:40:08 +0800 | [diff] [blame] | 1543 | goto error_sec_opts; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1544 | |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1545 | /* |
| 1546 | * Setup a dummy root and fs_info for test/set super. This is because |
| 1547 | * we don't actually fill this stuff out until open_ctree, but we need |
| 1548 | * it for searching for existing supers, so this lets us do that and |
| 1549 | * then open_ctree will properly initialize everything later. |
| 1550 | */ |
| 1551 | fs_info = kzalloc(sizeof(struct btrfs_fs_info), GFP_NOFS); |
Qu Wenruo | f667aef | 2014-09-23 13:40:08 +0800 | [diff] [blame] | 1552 | if (!fs_info) { |
| 1553 | error = -ENOMEM; |
| 1554 | goto error_sec_opts; |
| 1555 | } |
Ilya Dryomov | 04d21a2 | 2011-11-09 14:41:22 +0200 | [diff] [blame] | 1556 | |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1557 | fs_info->fs_devices = fs_devices; |
Josef Bacik | 450ba0e | 2010-11-19 14:59:15 -0500 | [diff] [blame] | 1558 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1559 | fs_info->super_copy = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
| 1560 | fs_info->super_for_commit = kzalloc(BTRFS_SUPER_INFO_SIZE, GFP_NOFS); |
Qu Wenruo | f667aef | 2014-09-23 13:40:08 +0800 | [diff] [blame] | 1561 | security_init_mnt_opts(&fs_info->security_opts); |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1562 | if (!fs_info->super_copy || !fs_info->super_for_commit) { |
| 1563 | error = -ENOMEM; |
Ilya Dryomov | 04d21a2 | 2011-11-09 14:41:22 +0200 | [diff] [blame] | 1564 | goto error_fs_info; |
| 1565 | } |
| 1566 | |
| 1567 | error = btrfs_open_devices(fs_devices, mode, fs_type); |
| 1568 | if (error) |
| 1569 | goto error_fs_info; |
| 1570 | |
| 1571 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { |
| 1572 | error = -EACCES; |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1573 | goto error_close_devices; |
| 1574 | } |
| 1575 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 1576 | bdev = fs_devices->latest_bdev; |
David Howells | 9249e17 | 2012-06-25 12:55:37 +0100 | [diff] [blame] | 1577 | s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | MS_NOSEC, |
| 1578 | fs_info); |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1579 | if (IS_ERR(s)) { |
| 1580 | error = PTR_ERR(s); |
| 1581 | goto error_close_devices; |
| 1582 | } |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1583 | |
| 1584 | if (s->s_root) { |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1585 | btrfs_close_devices(fs_devices); |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1586 | free_fs_info(fs_info); |
Al Viro | 59553ed | 2011-11-17 01:56:28 -0500 | [diff] [blame] | 1587 | if ((flags ^ s->s_flags) & MS_RDONLY) |
| 1588 | error = -EBUSY; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1589 | } else { |
Dmitry Monakhov | a1c6f057 | 2015-04-13 16:31:37 +0400 | [diff] [blame] | 1590 | snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1591 | btrfs_sb(s)->bdev_holder = fs_type; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1592 | error = btrfs_fill_super(s, fs_devices, data, |
| 1593 | flags & MS_SILENT ? 1 : 0); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1594 | } |
Omar Sandoval | 05dbe68 | 2015-05-18 02:16:30 -0700 | [diff] [blame] | 1595 | if (error) { |
Josef Bacik | 830c4ad | 2011-07-25 15:55:42 -0400 | [diff] [blame] | 1596 | deactivate_locked_super(s); |
Qu Wenruo | f667aef | 2014-09-23 13:40:08 +0800 | [diff] [blame] | 1597 | goto error_sec_opts; |
| 1598 | } |
| 1599 | |
| 1600 | fs_info = btrfs_sb(s); |
| 1601 | error = setup_security_options(fs_info, s, &new_sec_opts); |
| 1602 | if (error) { |
Qu Wenruo | f667aef | 2014-09-23 13:40:08 +0800 | [diff] [blame] | 1603 | deactivate_locked_super(s); |
| 1604 | goto error_sec_opts; |
| 1605 | } |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1606 | |
Omar Sandoval | 05dbe68 | 2015-05-18 02:16:30 -0700 | [diff] [blame] | 1607 | return dget(s->s_root); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1608 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1609 | error_close_devices: |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1610 | btrfs_close_devices(fs_devices); |
Ilya Dryomov | 04d21a2 | 2011-11-09 14:41:22 +0200 | [diff] [blame] | 1611 | error_fs_info: |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 1612 | free_fs_info(fs_info); |
Qu Wenruo | f667aef | 2014-09-23 13:40:08 +0800 | [diff] [blame] | 1613 | error_sec_opts: |
| 1614 | security_free_mnt_opts(&new_sec_opts); |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 1615 | return ERR_PTR(error); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 1616 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1617 | |
Sergei Trofimovich | 0d2450a | 2012-04-24 22:59:16 +0300 | [diff] [blame] | 1618 | static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info, |
| 1619 | int new_pool_size, int old_pool_size) |
| 1620 | { |
| 1621 | if (new_pool_size == old_pool_size) |
| 1622 | return; |
| 1623 | |
| 1624 | fs_info->thread_pool_size = new_pool_size; |
| 1625 | |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1626 | btrfs_info(fs_info, "resize thread pool %d -> %d", |
Sergei Trofimovich | 0d2450a | 2012-04-24 22:59:16 +0300 | [diff] [blame] | 1627 | old_pool_size, new_pool_size); |
| 1628 | |
Qu Wenruo | 5cdc7ad3 | 2014-02-28 10:46:06 +0800 | [diff] [blame] | 1629 | btrfs_workqueue_set_max(fs_info->workers, new_pool_size); |
Qu Wenruo | afe3d24 | 2014-02-28 10:46:07 +0800 | [diff] [blame] | 1630 | btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size); |
Qu Wenruo | a8c93d4 | 2014-02-28 10:46:08 +0800 | [diff] [blame] | 1631 | btrfs_workqueue_set_max(fs_info->submit_workers, new_pool_size); |
Qu Wenruo | e66f0bb | 2014-02-28 10:46:12 +0800 | [diff] [blame] | 1632 | btrfs_workqueue_set_max(fs_info->caching_workers, new_pool_size); |
Qu Wenruo | fccb5d8 | 2014-02-28 10:46:10 +0800 | [diff] [blame] | 1633 | btrfs_workqueue_set_max(fs_info->endio_workers, new_pool_size); |
| 1634 | btrfs_workqueue_set_max(fs_info->endio_meta_workers, new_pool_size); |
| 1635 | btrfs_workqueue_set_max(fs_info->endio_meta_write_workers, |
| 1636 | new_pool_size); |
| 1637 | btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size); |
| 1638 | btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size); |
Qu Wenruo | 5b3bc44 | 2014-02-28 10:46:15 +0800 | [diff] [blame] | 1639 | btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size); |
Qu Wenruo | 736cfa1 | 2014-02-28 10:46:13 +0800 | [diff] [blame] | 1640 | btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size); |
Qu Wenruo | 0339ef2 | 2014-02-28 10:46:17 +0800 | [diff] [blame] | 1641 | btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers, |
| 1642 | new_pool_size); |
Sergei Trofimovich | 0d2450a | 2012-04-24 22:59:16 +0300 | [diff] [blame] | 1643 | } |
| 1644 | |
Miao Xie | f42a34b | 2013-04-11 10:29:35 +0000 | [diff] [blame] | 1645 | static inline void btrfs_remount_prepare(struct btrfs_fs_info *fs_info) |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 1646 | { |
| 1647 | set_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); |
Miao Xie | f42a34b | 2013-04-11 10:29:35 +0000 | [diff] [blame] | 1648 | } |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 1649 | |
Miao Xie | f42a34b | 2013-04-11 10:29:35 +0000 | [diff] [blame] | 1650 | static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info, |
| 1651 | unsigned long old_opts, int flags) |
| 1652 | { |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 1653 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
| 1654 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || |
| 1655 | (flags & MS_RDONLY))) { |
| 1656 | /* wait for any defraggers to finish */ |
| 1657 | wait_event(fs_info->transaction_wait, |
| 1658 | (atomic_read(&fs_info->defrag_running) == 0)); |
| 1659 | if (flags & MS_RDONLY) |
| 1660 | sync_filesystem(fs_info->sb); |
| 1661 | } |
| 1662 | } |
| 1663 | |
| 1664 | static inline void btrfs_remount_cleanup(struct btrfs_fs_info *fs_info, |
| 1665 | unsigned long old_opts) |
| 1666 | { |
| 1667 | /* |
Luis de Bethencourt | 180e4d4 | 2016-04-04 15:31:22 +0100 | [diff] [blame^] | 1668 | * We need to cleanup all defragable inodes if the autodefragment is |
| 1669 | * close or the filesystem is read only. |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 1670 | */ |
| 1671 | if (btrfs_raw_test_opt(old_opts, AUTO_DEFRAG) && |
| 1672 | (!btrfs_raw_test_opt(fs_info->mount_opt, AUTO_DEFRAG) || |
| 1673 | (fs_info->sb->s_flags & MS_RDONLY))) { |
| 1674 | btrfs_cleanup_defrag_inodes(fs_info); |
| 1675 | } |
| 1676 | |
| 1677 | clear_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state); |
| 1678 | } |
| 1679 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1680 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
| 1681 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1682 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
| 1683 | struct btrfs_root *root = fs_info->tree_root; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1684 | unsigned old_flags = sb->s_flags; |
| 1685 | unsigned long old_opts = fs_info->mount_opt; |
| 1686 | unsigned long old_compress_type = fs_info->compress_type; |
| 1687 | u64 old_max_inline = fs_info->max_inline; |
| 1688 | u64 old_alloc_start = fs_info->alloc_start; |
| 1689 | int old_thread_pool_size = fs_info->thread_pool_size; |
| 1690 | unsigned int old_metadata_ratio = fs_info->metadata_ratio; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1691 | int ret; |
| 1692 | |
Theodore Ts'o | 02b9984 | 2014-03-13 10:14:33 -0400 | [diff] [blame] | 1693 | sync_filesystem(sb); |
Miao Xie | f42a34b | 2013-04-11 10:29:35 +0000 | [diff] [blame] | 1694 | btrfs_remount_prepare(fs_info); |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 1695 | |
Qu Wenruo | f667aef | 2014-09-23 13:40:08 +0800 | [diff] [blame] | 1696 | if (data) { |
| 1697 | struct security_mnt_opts new_sec_opts; |
| 1698 | |
| 1699 | security_init_mnt_opts(&new_sec_opts); |
| 1700 | ret = parse_security_options(data, &new_sec_opts); |
| 1701 | if (ret) |
| 1702 | goto restore; |
| 1703 | ret = setup_security_options(fs_info, sb, |
| 1704 | &new_sec_opts); |
| 1705 | if (ret) { |
| 1706 | security_free_mnt_opts(&new_sec_opts); |
| 1707 | goto restore; |
| 1708 | } |
| 1709 | } |
| 1710 | |
Qu Wenruo | 96da091 | 2016-01-19 10:23:03 +0800 | [diff] [blame] | 1711 | ret = btrfs_parse_options(root, data, *flags); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1712 | if (ret) { |
| 1713 | ret = -EINVAL; |
| 1714 | goto restore; |
| 1715 | } |
Chris Mason | b288052 | 2009-02-12 09:37:35 -0500 | [diff] [blame] | 1716 | |
Miao Xie | f42a34b | 2013-04-11 10:29:35 +0000 | [diff] [blame] | 1717 | btrfs_remount_begin(fs_info, old_opts, *flags); |
Sergei Trofimovich | 0d2450a | 2012-04-24 22:59:16 +0300 | [diff] [blame] | 1718 | btrfs_resize_thread_pool(fs_info, |
| 1719 | fs_info->thread_pool_size, old_thread_pool_size); |
| 1720 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1721 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 1722 | goto out; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1723 | |
| 1724 | if (*flags & MS_RDONLY) { |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 1725 | /* |
| 1726 | * this also happens on 'umount -rf' or on shutdown, when |
| 1727 | * the filesystem is busy. |
| 1728 | */ |
Miao Xie | 21c7e75 | 2014-05-13 17:29:04 -0700 | [diff] [blame] | 1729 | cancel_work_sync(&fs_info->async_reclaim_work); |
Stefan Behrens | 361c093 | 2013-10-11 17:14:58 +0200 | [diff] [blame] | 1730 | |
| 1731 | /* wait for the uuid_scan task to finish */ |
| 1732 | down(&fs_info->uuid_tree_rescan_sem); |
| 1733 | /* avoid complains from lockdep et al. */ |
| 1734 | up(&fs_info->uuid_tree_rescan_sem); |
| 1735 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1736 | sb->s_flags |= MS_RDONLY; |
| 1737 | |
Jeff Mahoney | e44163e | 2015-06-15 09:41:18 -0400 | [diff] [blame] | 1738 | /* |
| 1739 | * Setting MS_RDONLY will put the cleaner thread to |
| 1740 | * sleep at the next loop if it's already active. |
| 1741 | * If it's already asleep, we'll leave unused block |
| 1742 | * groups on disk until we're mounted read-write again |
| 1743 | * unless we clean them up here. |
| 1744 | */ |
Jeff Mahoney | e44163e | 2015-06-15 09:41:18 -0400 | [diff] [blame] | 1745 | btrfs_delete_unused_bgs(fs_info); |
Jeff Mahoney | e44163e | 2015-06-15 09:41:18 -0400 | [diff] [blame] | 1746 | |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 1747 | btrfs_dev_replace_suspend_for_unmount(fs_info); |
| 1748 | btrfs_scrub_cancel(fs_info); |
Miao Xie | 061594e | 2013-05-15 07:48:17 +0000 | [diff] [blame] | 1749 | btrfs_pause_balance(fs_info); |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 1750 | |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1751 | ret = btrfs_commit_super(root); |
| 1752 | if (ret) |
| 1753 | goto restore; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1754 | } else { |
David Sterba | 6ef3de9 | 2013-09-13 17:41:20 +0200 | [diff] [blame] | 1755 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { |
| 1756 | btrfs_err(fs_info, |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1757 | "Remounting read-write after error is not allowed"); |
David Sterba | 6ef3de9 | 2013-09-13 17:41:20 +0200 | [diff] [blame] | 1758 | ret = -EINVAL; |
| 1759 | goto restore; |
| 1760 | } |
Sergei Trofimovich | 8a3db18 | 2012-04-16 06:44:37 +0300 | [diff] [blame] | 1761 | if (fs_info->fs_devices->rw_devices == 0) { |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1762 | ret = -EACCES; |
| 1763 | goto restore; |
Sergei Trofimovich | 8a3db18 | 2012-04-16 06:44:37 +0300 | [diff] [blame] | 1764 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1765 | |
Stefan Behrens | 292fd7f | 2012-10-30 17:16:16 +0000 | [diff] [blame] | 1766 | if (fs_info->fs_devices->missing_devices > |
| 1767 | fs_info->num_tolerated_disk_barrier_failures && |
| 1768 | !(*flags & MS_RDONLY)) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1769 | btrfs_warn(fs_info, |
| 1770 | "too many missing devices, writeable remount is not allowed"); |
Stefan Behrens | 292fd7f | 2012-10-30 17:16:16 +0000 | [diff] [blame] | 1771 | ret = -EACCES; |
| 1772 | goto restore; |
| 1773 | } |
| 1774 | |
Sergei Trofimovich | 8a3db18 | 2012-04-16 06:44:37 +0300 | [diff] [blame] | 1775 | if (btrfs_super_log_root(fs_info->super_copy) != 0) { |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1776 | ret = -EINVAL; |
| 1777 | goto restore; |
Sergei Trofimovich | 8a3db18 | 2012-04-16 06:44:37 +0300 | [diff] [blame] | 1778 | } |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1779 | |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 1780 | ret = btrfs_cleanup_fs_roots(fs_info); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1781 | if (ret) |
| 1782 | goto restore; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1783 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1784 | /* recover relocation */ |
Wang Shilong | 5f31648 | 2014-06-26 11:08:16 +0800 | [diff] [blame] | 1785 | mutex_lock(&fs_info->cleaner_mutex); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1786 | ret = btrfs_recover_relocation(root); |
Wang Shilong | 5f31648 | 2014-06-26 11:08:16 +0800 | [diff] [blame] | 1787 | mutex_unlock(&fs_info->cleaner_mutex); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1788 | if (ret) |
| 1789 | goto restore; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1790 | |
Ilya Dryomov | 2b6ba62 | 2012-06-22 12:24:13 -0600 | [diff] [blame] | 1791 | ret = btrfs_resume_balance_async(fs_info); |
| 1792 | if (ret) |
| 1793 | goto restore; |
| 1794 | |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 1795 | ret = btrfs_resume_dev_replace_async(fs_info); |
| 1796 | if (ret) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1797 | btrfs_warn(fs_info, "failed to resume dev_replace"); |
Stefan Behrens | 8dabb74 | 2012-11-06 13:15:27 +0100 | [diff] [blame] | 1798 | goto restore; |
| 1799 | } |
Josef Bacik | 94aebfb | 2013-09-20 22:33:20 -0400 | [diff] [blame] | 1800 | |
| 1801 | if (!fs_info->uuid_root) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1802 | btrfs_info(fs_info, "creating UUID tree"); |
Josef Bacik | 94aebfb | 2013-09-20 22:33:20 -0400 | [diff] [blame] | 1803 | ret = btrfs_create_uuid_tree(fs_info); |
| 1804 | if (ret) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 1805 | btrfs_warn(fs_info, "failed to create the UUID tree %d", ret); |
Josef Bacik | 94aebfb | 2013-09-20 22:33:20 -0400 | [diff] [blame] | 1806 | goto restore; |
| 1807 | } |
| 1808 | } |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1809 | sb->s_flags &= ~MS_RDONLY; |
| 1810 | } |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 1811 | out: |
Justin Maggard | 2c6a92b | 2014-02-20 08:48:07 -0800 | [diff] [blame] | 1812 | wake_up_process(fs_info->transaction_kthread); |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 1813 | btrfs_remount_cleanup(fs_info, old_opts); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1814 | return 0; |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1815 | |
| 1816 | restore: |
| 1817 | /* We've hit an error - don't reset MS_RDONLY */ |
| 1818 | if (sb->s_flags & MS_RDONLY) |
| 1819 | old_flags |= MS_RDONLY; |
| 1820 | sb->s_flags = old_flags; |
| 1821 | fs_info->mount_opt = old_opts; |
| 1822 | fs_info->compress_type = old_compress_type; |
| 1823 | fs_info->max_inline = old_max_inline; |
Miao Xie | c018dae | 2013-01-29 10:07:33 +0000 | [diff] [blame] | 1824 | mutex_lock(&fs_info->chunk_mutex); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1825 | fs_info->alloc_start = old_alloc_start; |
Miao Xie | c018dae | 2013-01-29 10:07:33 +0000 | [diff] [blame] | 1826 | mutex_unlock(&fs_info->chunk_mutex); |
Sergei Trofimovich | 0d2450a | 2012-04-24 22:59:16 +0300 | [diff] [blame] | 1827 | btrfs_resize_thread_pool(fs_info, |
| 1828 | old_thread_pool_size, fs_info->thread_pool_size); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1829 | fs_info->metadata_ratio = old_metadata_ratio; |
Miao Xie | dc81cdc | 2013-02-20 23:32:52 -0700 | [diff] [blame] | 1830 | btrfs_remount_cleanup(fs_info, old_opts); |
Jeff Mahoney | 49b25e0 | 2012-03-01 17:24:58 +0100 | [diff] [blame] | 1831 | return ret; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1832 | } |
| 1833 | |
Arne Jansen | bcd5374 | 2011-04-12 10:43:21 +0200 | [diff] [blame] | 1834 | /* Used to sort the devices by max_avail(descending sort) */ |
| 1835 | static int btrfs_cmp_device_free_bytes(const void *dev_info1, |
| 1836 | const void *dev_info2) |
| 1837 | { |
| 1838 | if (((struct btrfs_device_info *)dev_info1)->max_avail > |
| 1839 | ((struct btrfs_device_info *)dev_info2)->max_avail) |
| 1840 | return -1; |
| 1841 | else if (((struct btrfs_device_info *)dev_info1)->max_avail < |
| 1842 | ((struct btrfs_device_info *)dev_info2)->max_avail) |
| 1843 | return 1; |
| 1844 | else |
| 1845 | return 0; |
| 1846 | } |
| 1847 | |
| 1848 | /* |
| 1849 | * sort the devices by max_avail, in which max free extent size of each device |
| 1850 | * is stored.(Descending Sort) |
| 1851 | */ |
| 1852 | static inline void btrfs_descending_sort_devices( |
| 1853 | struct btrfs_device_info *devices, |
| 1854 | size_t nr_devices) |
| 1855 | { |
| 1856 | sort(devices, nr_devices, sizeof(struct btrfs_device_info), |
| 1857 | btrfs_cmp_device_free_bytes, NULL); |
| 1858 | } |
| 1859 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1860 | /* |
| 1861 | * The helper to calc the free space on the devices that can be used to store |
| 1862 | * file data. |
| 1863 | */ |
| 1864 | static int btrfs_calc_avail_data_space(struct btrfs_root *root, u64 *free_bytes) |
| 1865 | { |
| 1866 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1867 | struct btrfs_device_info *devices_info; |
| 1868 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; |
| 1869 | struct btrfs_device *device; |
| 1870 | u64 skip_space; |
| 1871 | u64 type; |
| 1872 | u64 avail_space; |
| 1873 | u64 used_space; |
| 1874 | u64 min_stripe_size; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1875 | int min_stripes = 1, num_stripes = 1; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1876 | int i = 0, nr_devices; |
| 1877 | int ret; |
| 1878 | |
Josef Bacik | 7e33fd9 | 2014-11-03 08:56:50 -0500 | [diff] [blame] | 1879 | /* |
| 1880 | * We aren't under the device list lock, so this is racey-ish, but good |
| 1881 | * enough for our purposes. |
| 1882 | */ |
Li Zefan | b772a86 | 2011-11-28 16:43:00 +0800 | [diff] [blame] | 1883 | nr_devices = fs_info->fs_devices->open_devices; |
Josef Bacik | 7e33fd9 | 2014-11-03 08:56:50 -0500 | [diff] [blame] | 1884 | if (!nr_devices) { |
| 1885 | smp_mb(); |
| 1886 | nr_devices = fs_info->fs_devices->open_devices; |
| 1887 | ASSERT(nr_devices); |
| 1888 | if (!nr_devices) { |
| 1889 | *free_bytes = 0; |
| 1890 | return 0; |
| 1891 | } |
| 1892 | } |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1893 | |
Dulshani Gunawardhana | d9b0d9b | 2013-10-31 10:32:18 +0530 | [diff] [blame] | 1894 | devices_info = kmalloc_array(nr_devices, sizeof(*devices_info), |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1895 | GFP_NOFS); |
| 1896 | if (!devices_info) |
| 1897 | return -ENOMEM; |
| 1898 | |
| 1899 | /* calc min stripe number for data space alloction */ |
| 1900 | type = btrfs_get_alloc_profile(root, 1); |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1901 | if (type & BTRFS_BLOCK_GROUP_RAID0) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1902 | min_stripes = 2; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1903 | num_stripes = nr_devices; |
| 1904 | } else if (type & BTRFS_BLOCK_GROUP_RAID1) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1905 | min_stripes = 2; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1906 | num_stripes = 2; |
| 1907 | } else if (type & BTRFS_BLOCK_GROUP_RAID10) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1908 | min_stripes = 4; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1909 | num_stripes = 4; |
| 1910 | } |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1911 | |
| 1912 | if (type & BTRFS_BLOCK_GROUP_DUP) |
| 1913 | min_stripe_size = 2 * BTRFS_STRIPE_LEN; |
| 1914 | else |
| 1915 | min_stripe_size = BTRFS_STRIPE_LEN; |
| 1916 | |
Josef Bacik | 7e33fd9 | 2014-11-03 08:56:50 -0500 | [diff] [blame] | 1917 | if (fs_info->alloc_start) |
| 1918 | mutex_lock(&fs_devices->device_list_mutex); |
| 1919 | rcu_read_lock(); |
| 1920 | list_for_each_entry_rcu(device, &fs_devices->devices, dev_list) { |
Stefan Behrens | 63a212a | 2012-11-05 18:29:28 +0100 | [diff] [blame] | 1921 | if (!device->in_fs_metadata || !device->bdev || |
| 1922 | device->is_tgtdev_for_dev_replace) |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1923 | continue; |
| 1924 | |
Josef Bacik | 7e33fd9 | 2014-11-03 08:56:50 -0500 | [diff] [blame] | 1925 | if (i >= nr_devices) |
| 1926 | break; |
| 1927 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1928 | avail_space = device->total_bytes - device->bytes_used; |
| 1929 | |
| 1930 | /* align with stripe_len */ |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 1931 | avail_space = div_u64(avail_space, BTRFS_STRIPE_LEN); |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1932 | avail_space *= BTRFS_STRIPE_LEN; |
| 1933 | |
| 1934 | /* |
| 1935 | * In order to avoid overwritting the superblock on the drive, |
| 1936 | * btrfs starts at an offset of at least 1MB when doing chunk |
| 1937 | * allocation. |
| 1938 | */ |
Byongho Lee | ee22184 | 2015-12-15 01:42:10 +0900 | [diff] [blame] | 1939 | skip_space = SZ_1M; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1940 | |
| 1941 | /* user can set the offset in fs_info->alloc_start. */ |
Josef Bacik | 7e33fd9 | 2014-11-03 08:56:50 -0500 | [diff] [blame] | 1942 | if (fs_info->alloc_start && |
| 1943 | fs_info->alloc_start + BTRFS_STRIPE_LEN <= |
| 1944 | device->total_bytes) { |
| 1945 | rcu_read_unlock(); |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1946 | skip_space = max(fs_info->alloc_start, skip_space); |
| 1947 | |
Josef Bacik | 7e33fd9 | 2014-11-03 08:56:50 -0500 | [diff] [blame] | 1948 | /* |
| 1949 | * btrfs can not use the free space in |
| 1950 | * [0, skip_space - 1], we must subtract it from the |
| 1951 | * total. In order to implement it, we account the used |
| 1952 | * space in this range first. |
| 1953 | */ |
| 1954 | ret = btrfs_account_dev_extents_size(device, 0, |
| 1955 | skip_space - 1, |
| 1956 | &used_space); |
| 1957 | if (ret) { |
| 1958 | kfree(devices_info); |
| 1959 | mutex_unlock(&fs_devices->device_list_mutex); |
| 1960 | return ret; |
| 1961 | } |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1962 | |
Josef Bacik | 7e33fd9 | 2014-11-03 08:56:50 -0500 | [diff] [blame] | 1963 | rcu_read_lock(); |
| 1964 | |
| 1965 | /* calc the free space in [0, skip_space - 1] */ |
| 1966 | skip_space -= used_space; |
| 1967 | } |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1968 | |
| 1969 | /* |
| 1970 | * we can use the free space in [0, skip_space - 1], subtract |
| 1971 | * it from the total. |
| 1972 | */ |
| 1973 | if (avail_space && avail_space >= skip_space) |
| 1974 | avail_space -= skip_space; |
| 1975 | else |
| 1976 | avail_space = 0; |
| 1977 | |
| 1978 | if (avail_space < min_stripe_size) |
| 1979 | continue; |
| 1980 | |
| 1981 | devices_info[i].dev = device; |
| 1982 | devices_info[i].max_avail = avail_space; |
| 1983 | |
| 1984 | i++; |
| 1985 | } |
Josef Bacik | 7e33fd9 | 2014-11-03 08:56:50 -0500 | [diff] [blame] | 1986 | rcu_read_unlock(); |
| 1987 | if (fs_info->alloc_start) |
| 1988 | mutex_unlock(&fs_devices->device_list_mutex); |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 1989 | |
| 1990 | nr_devices = i; |
| 1991 | |
| 1992 | btrfs_descending_sort_devices(devices_info, nr_devices); |
| 1993 | |
| 1994 | i = nr_devices - 1; |
| 1995 | avail_space = 0; |
| 1996 | while (nr_devices >= min_stripes) { |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 1997 | if (num_stripes > nr_devices) |
| 1998 | num_stripes = nr_devices; |
| 1999 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 2000 | if (devices_info[i].max_avail >= min_stripe_size) { |
| 2001 | int j; |
| 2002 | u64 alloc_size; |
| 2003 | |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 2004 | avail_space += devices_info[i].max_avail * num_stripes; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 2005 | alloc_size = devices_info[i].max_avail; |
Miao Xie | 39fb26c | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 2006 | for (j = i + 1 - num_stripes; j <= i; j++) |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 2007 | devices_info[j].max_avail -= alloc_size; |
| 2008 | } |
| 2009 | i--; |
| 2010 | nr_devices--; |
| 2011 | } |
| 2012 | |
| 2013 | kfree(devices_info); |
| 2014 | *free_bytes = avail_space; |
| 2015 | return 0; |
| 2016 | } |
| 2017 | |
David Sterba | ba7b6e6 | 2014-07-01 16:21:33 +0200 | [diff] [blame] | 2018 | /* |
| 2019 | * Calculate numbers for 'df', pessimistic in case of mixed raid profiles. |
| 2020 | * |
| 2021 | * If there's a redundant raid level at DATA block groups, use the respective |
| 2022 | * multiplier to scale the sizes. |
| 2023 | * |
| 2024 | * Unused device space usage is based on simulating the chunk allocator |
| 2025 | * algorithm that respects the device sizes, order of allocations and the |
| 2026 | * 'alloc_start' value, this is a close approximation of the actual use but |
| 2027 | * there are other factors that may change the result (like a new metadata |
| 2028 | * chunk). |
| 2029 | * |
David Sterba | ca8a51b | 2015-10-10 17:59:53 +0200 | [diff] [blame] | 2030 | * If metadata is exhausted, f_bavail will be 0. |
| 2031 | * |
David Sterba | ba7b6e6 | 2014-07-01 16:21:33 +0200 | [diff] [blame] | 2032 | * FIXME: not accurate for mixed block groups, total and free/used are ok, |
| 2033 | * available appears slightly larger. |
| 2034 | */ |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 2035 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 2036 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 2037 | struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb); |
| 2038 | struct btrfs_super_block *disk_super = fs_info->super_copy; |
| 2039 | struct list_head *head = &fs_info->space_info; |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 2040 | struct btrfs_space_info *found; |
| 2041 | u64 total_used = 0; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 2042 | u64 total_free_data = 0; |
David Sterba | ca8a51b | 2015-10-10 17:59:53 +0200 | [diff] [blame] | 2043 | u64 total_free_meta = 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2044 | int bits = dentry->d_sb->s_blocksize_bits; |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 2045 | __be32 *fsid = (__be32 *)fs_info->fsid; |
David Sterba | ba7b6e6 | 2014-07-01 16:21:33 +0200 | [diff] [blame] | 2046 | unsigned factor = 1; |
| 2047 | struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 2048 | int ret; |
David Sterba | ca8a51b | 2015-10-10 17:59:53 +0200 | [diff] [blame] | 2049 | u64 thresh = 0; |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 2050 | |
Miao Xie | 1548437 | 2014-09-03 21:35:40 +0800 | [diff] [blame] | 2051 | /* |
Luis de Bethencourt | 180e4d4 | 2016-04-04 15:31:22 +0100 | [diff] [blame^] | 2052 | * holding chunk_mutex to avoid allocating new chunks, holding |
Miao Xie | 1548437 | 2014-09-03 21:35:40 +0800 | [diff] [blame] | 2053 | * device_list_mutex to avoid the device being removed |
| 2054 | */ |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 2055 | rcu_read_lock(); |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 2056 | list_for_each_entry_rcu(found, head, list) { |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 2057 | if (found->flags & BTRFS_BLOCK_GROUP_DATA) { |
David Sterba | ba7b6e6 | 2014-07-01 16:21:33 +0200 | [diff] [blame] | 2058 | int i; |
| 2059 | |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 2060 | total_free_data += found->disk_total - found->disk_used; |
| 2061 | total_free_data -= |
| 2062 | btrfs_account_ro_block_groups_free_space(found); |
David Sterba | ba7b6e6 | 2014-07-01 16:21:33 +0200 | [diff] [blame] | 2063 | |
| 2064 | for (i = 0; i < BTRFS_NR_RAID_TYPES; i++) { |
| 2065 | if (!list_empty(&found->block_groups[i])) { |
| 2066 | switch (i) { |
| 2067 | case BTRFS_RAID_DUP: |
| 2068 | case BTRFS_RAID_RAID1: |
| 2069 | case BTRFS_RAID_RAID10: |
| 2070 | factor = 2; |
| 2071 | } |
| 2072 | } |
| 2073 | } |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 2074 | } |
David Sterba | ca8a51b | 2015-10-10 17:59:53 +0200 | [diff] [blame] | 2075 | if (found->flags & BTRFS_BLOCK_GROUP_METADATA) |
| 2076 | total_free_meta += found->disk_total - found->disk_used; |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 2077 | |
Yan, Zheng | b742bb8 | 2010-05-16 10:46:24 -0400 | [diff] [blame] | 2078 | total_used += found->disk_used; |
Josef Bacik | 89a5589 | 2010-10-14 14:52:27 -0400 | [diff] [blame] | 2079 | } |
David Sterba | ba7b6e6 | 2014-07-01 16:21:33 +0200 | [diff] [blame] | 2080 | |
Josef Bacik | bd4d108 | 2010-03-05 21:59:21 +0000 | [diff] [blame] | 2081 | rcu_read_unlock(); |
| 2082 | |
David Sterba | ba7b6e6 | 2014-07-01 16:21:33 +0200 | [diff] [blame] | 2083 | buf->f_blocks = div_u64(btrfs_super_total_bytes(disk_super), factor); |
| 2084 | buf->f_blocks >>= bits; |
| 2085 | buf->f_bfree = buf->f_blocks - (div_u64(total_used, factor) >> bits); |
| 2086 | |
| 2087 | /* Account global block reserve as used, it's in logical size already */ |
| 2088 | spin_lock(&block_rsv->lock); |
| 2089 | buf->f_bfree -= block_rsv->size >> bits; |
| 2090 | spin_unlock(&block_rsv->lock); |
| 2091 | |
David Sterba | 0d95c1b | 2014-11-14 15:05:06 +0100 | [diff] [blame] | 2092 | buf->f_bavail = div_u64(total_free_data, factor); |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 2093 | ret = btrfs_calc_avail_data_space(fs_info->tree_root, &total_free_data); |
Josef Bacik | 7e33fd9 | 2014-11-03 08:56:50 -0500 | [diff] [blame] | 2094 | if (ret) |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 2095 | return ret; |
David Sterba | ba7b6e6 | 2014-07-01 16:21:33 +0200 | [diff] [blame] | 2096 | buf->f_bavail += div_u64(total_free_data, factor); |
Miao Xie | 6d07bce | 2011-01-05 10:07:31 +0000 | [diff] [blame] | 2097 | buf->f_bavail = buf->f_bavail >> bits; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2098 | |
David Sterba | ca8a51b | 2015-10-10 17:59:53 +0200 | [diff] [blame] | 2099 | /* |
| 2100 | * We calculate the remaining metadata space minus global reserve. If |
| 2101 | * this is (supposedly) smaller than zero, there's no space. But this |
| 2102 | * does not hold in practice, the exhausted state happens where's still |
| 2103 | * some positive delta. So we apply some guesswork and compare the |
| 2104 | * delta to a 4M threshold. (Practically observed delta was ~2M.) |
| 2105 | * |
| 2106 | * We probably cannot calculate the exact threshold value because this |
| 2107 | * depends on the internal reservations requested by various |
| 2108 | * operations, so some operations that consume a few metadata will |
| 2109 | * succeed even if the Avail is zero. But this is better than the other |
| 2110 | * way around. |
| 2111 | */ |
| 2112 | thresh = 4 * 1024 * 1024; |
| 2113 | |
| 2114 | if (total_free_meta - thresh < block_rsv->size) |
| 2115 | buf->f_bavail = 0; |
| 2116 | |
David Sterba | ba7b6e6 | 2014-07-01 16:21:33 +0200 | [diff] [blame] | 2117 | buf->f_type = BTRFS_SUPER_MAGIC; |
| 2118 | buf->f_bsize = dentry->d_sb->s_blocksize; |
| 2119 | buf->f_namelen = BTRFS_NAME_LEN; |
| 2120 | |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 2121 | /* We treat it as constant endianness (it doesn't matter _which_) |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2122 | because we want the fsid to come out the same whether mounted |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 2123 | on a big-endian or little-endian host */ |
| 2124 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); |
| 2125 | 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] | 2126 | /* Mask in the root object ID too, to disambiguate subvols */ |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 2127 | buf->f_fsid.val[0] ^= BTRFS_I(d_inode(dentry))->root->objectid >> 32; |
| 2128 | buf->f_fsid.val[1] ^= BTRFS_I(d_inode(dentry))->root->objectid; |
David Woodhouse | 32d48fa | 2008-08-18 13:10:20 +0100 | [diff] [blame] | 2129 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 2130 | return 0; |
| 2131 | } |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 2132 | |
Al Viro | aea52e1 | 2011-11-17 01:22:46 -0500 | [diff] [blame] | 2133 | static void btrfs_kill_super(struct super_block *sb) |
| 2134 | { |
Al Viro | 815745c | 2011-11-17 15:40:49 -0500 | [diff] [blame] | 2135 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
Al Viro | aea52e1 | 2011-11-17 01:22:46 -0500 | [diff] [blame] | 2136 | kill_anon_super(sb); |
Al Viro | d22ca7d | 2011-11-17 01:46:50 -0500 | [diff] [blame] | 2137 | free_fs_info(fs_info); |
Al Viro | aea52e1 | 2011-11-17 01:22:46 -0500 | [diff] [blame] | 2138 | } |
| 2139 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 2140 | static struct file_system_type btrfs_fs_type = { |
| 2141 | .owner = THIS_MODULE, |
| 2142 | .name = "btrfs", |
Al Viro | 061dbc6 | 2010-07-26 16:21:33 +0400 | [diff] [blame] | 2143 | .mount = btrfs_mount, |
Al Viro | aea52e1 | 2011-11-17 01:22:46 -0500 | [diff] [blame] | 2144 | .kill_sb = btrfs_kill_super, |
Qu Wenruo | f667aef | 2014-09-23 13:40:08 +0800 | [diff] [blame] | 2145 | .fs_flags = FS_REQUIRES_DEV | FS_BINARY_MOUNTDATA, |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 2146 | }; |
Eric W. Biederman | 7f78e03 | 2013-03-02 19:39:14 -0800 | [diff] [blame] | 2147 | MODULE_ALIAS_FS("btrfs"); |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 2148 | |
Tom Van Braeckel | d862095 | 2015-03-24 16:35:49 +0100 | [diff] [blame] | 2149 | static int btrfs_control_open(struct inode *inode, struct file *file) |
| 2150 | { |
| 2151 | /* |
| 2152 | * The control file's private_data is used to hold the |
| 2153 | * transaction when it is started and is used to keep |
| 2154 | * track of whether a transaction is already in progress. |
| 2155 | */ |
| 2156 | file->private_data = NULL; |
| 2157 | return 0; |
| 2158 | } |
| 2159 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2160 | /* |
| 2161 | * used by btrfsctl to scan devices when no FS is mounted |
| 2162 | */ |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2163 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
| 2164 | unsigned long arg) |
| 2165 | { |
| 2166 | struct btrfs_ioctl_vol_args *vol; |
| 2167 | struct btrfs_fs_devices *fs_devices; |
Chris Mason | c071fcf | 2009-01-16 11:59:08 -0500 | [diff] [blame] | 2168 | int ret = -ENOTTY; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2169 | |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 2170 | if (!capable(CAP_SYS_ADMIN)) |
| 2171 | return -EPERM; |
| 2172 | |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 2173 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
| 2174 | if (IS_ERR(vol)) |
| 2175 | return PTR_ERR(vol); |
Chris Mason | c071fcf | 2009-01-16 11:59:08 -0500 | [diff] [blame] | 2176 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2177 | switch (cmd) { |
| 2178 | case BTRFS_IOC_SCAN_DEV: |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 2179 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2180 | &btrfs_fs_type, &fs_devices); |
| 2181 | break; |
Josef Bacik | 02db084 | 2012-06-21 16:03:58 -0400 | [diff] [blame] | 2182 | case BTRFS_IOC_DEVICES_READY: |
| 2183 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
| 2184 | &btrfs_fs_type, &fs_devices); |
| 2185 | if (ret) |
| 2186 | break; |
| 2187 | ret = !(fs_devices->num_devices == fs_devices->total_devices); |
| 2188 | break; |
David Sterba | c5868f8 | 2016-02-17 15:24:14 +0100 | [diff] [blame] | 2189 | case BTRFS_IOC_GET_SUPPORTED_FEATURES: |
David Sterba | d5131b6 | 2016-02-17 15:26:27 +0100 | [diff] [blame] | 2190 | ret = btrfs_ioctl_get_supported_features((void __user*)arg); |
David Sterba | c5868f8 | 2016-02-17 15:24:14 +0100 | [diff] [blame] | 2191 | break; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2192 | } |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 2193 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2194 | kfree(vol); |
Linda Knippers | f819d83 | 2008-06-09 22:17:11 -0400 | [diff] [blame] | 2195 | return ret; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2196 | } |
| 2197 | |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 2198 | static int btrfs_freeze(struct super_block *sb) |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 2199 | { |
Miao Xie | 354aa0f | 2012-09-20 01:54:00 -0600 | [diff] [blame] | 2200 | struct btrfs_trans_handle *trans; |
| 2201 | struct btrfs_root *root = btrfs_sb(sb)->tree_root; |
| 2202 | |
Miao Xie | d4edf39 | 2013-02-20 09:17:06 +0000 | [diff] [blame] | 2203 | trans = btrfs_attach_transaction_barrier(root); |
Miao Xie | 354aa0f | 2012-09-20 01:54:00 -0600 | [diff] [blame] | 2204 | if (IS_ERR(trans)) { |
| 2205 | /* no transaction, don't bother */ |
| 2206 | if (PTR_ERR(trans) == -ENOENT) |
| 2207 | return 0; |
| 2208 | return PTR_ERR(trans); |
| 2209 | } |
| 2210 | return btrfs_commit_transaction(trans, root); |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 2211 | } |
| 2212 | |
Josef Bacik | 9c5085c | 2012-06-05 14:13:12 -0400 | [diff] [blame] | 2213 | static int btrfs_show_devname(struct seq_file *m, struct dentry *root) |
| 2214 | { |
| 2215 | struct btrfs_fs_info *fs_info = btrfs_sb(root->d_sb); |
| 2216 | struct btrfs_fs_devices *cur_devices; |
| 2217 | struct btrfs_device *dev, *first_dev = NULL; |
| 2218 | struct list_head *head; |
| 2219 | struct rcu_string *name; |
| 2220 | |
| 2221 | mutex_lock(&fs_info->fs_devices->device_list_mutex); |
| 2222 | cur_devices = fs_info->fs_devices; |
| 2223 | while (cur_devices) { |
| 2224 | head = &cur_devices->devices; |
| 2225 | list_for_each_entry(dev, head, dev_list) { |
Josef Bacik | aa9ddcd | 2012-08-02 10:22:20 -0400 | [diff] [blame] | 2226 | if (dev->missing) |
| 2227 | continue; |
Anand Jain | 0aeb8a6e | 2014-06-30 17:12:48 +0800 | [diff] [blame] | 2228 | if (!dev->name) |
| 2229 | continue; |
Josef Bacik | 9c5085c | 2012-06-05 14:13:12 -0400 | [diff] [blame] | 2230 | if (!first_dev || dev->devid < first_dev->devid) |
| 2231 | first_dev = dev; |
| 2232 | } |
| 2233 | cur_devices = cur_devices->seed; |
| 2234 | } |
| 2235 | |
| 2236 | if (first_dev) { |
| 2237 | rcu_read_lock(); |
| 2238 | name = rcu_dereference(first_dev->name); |
| 2239 | seq_escape(m, name->str, " \t\n\\"); |
| 2240 | rcu_read_unlock(); |
| 2241 | } else { |
| 2242 | WARN_ON(1); |
| 2243 | } |
| 2244 | mutex_unlock(&fs_info->fs_devices->device_list_mutex); |
| 2245 | return 0; |
| 2246 | } |
| 2247 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 2248 | static const struct super_operations btrfs_super_ops = { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 2249 | .drop_inode = btrfs_drop_inode, |
Al Viro | bd55597 | 2010-06-07 11:35:40 -0400 | [diff] [blame] | 2250 | .evict_inode = btrfs_evict_inode, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2251 | .put_super = btrfs_put_super, |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 2252 | .sync_fs = btrfs_sync_fs, |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 2253 | .show_options = btrfs_show_options, |
Josef Bacik | 9c5085c | 2012-06-05 14:13:12 -0400 | [diff] [blame] | 2254 | .show_devname = btrfs_show_devname, |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 2255 | .write_inode = btrfs_write_inode, |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2256 | .alloc_inode = btrfs_alloc_inode, |
| 2257 | .destroy_inode = btrfs_destroy_inode, |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 2258 | .statfs = btrfs_statfs, |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 2259 | .remount_fs = btrfs_remount, |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 2260 | .freeze_fs = btrfs_freeze, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2261 | }; |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 2262 | |
| 2263 | static const struct file_operations btrfs_ctl_fops = { |
Tom Van Braeckel | d862095 | 2015-03-24 16:35:49 +0100 | [diff] [blame] | 2264 | .open = btrfs_control_open, |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 2265 | .unlocked_ioctl = btrfs_control_ioctl, |
| 2266 | .compat_ioctl = btrfs_control_ioctl, |
| 2267 | .owner = THIS_MODULE, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 2268 | .llseek = noop_llseek, |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 2269 | }; |
| 2270 | |
| 2271 | static struct miscdevice btrfs_misc = { |
Kay Sievers | 578454f | 2010-05-20 18:07:20 +0200 | [diff] [blame] | 2272 | .minor = BTRFS_MINOR, |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 2273 | .name = "btrfs-control", |
| 2274 | .fops = &btrfs_ctl_fops |
| 2275 | }; |
| 2276 | |
Kay Sievers | 578454f | 2010-05-20 18:07:20 +0200 | [diff] [blame] | 2277 | MODULE_ALIAS_MISCDEV(BTRFS_MINOR); |
| 2278 | MODULE_ALIAS("devname:btrfs-control"); |
| 2279 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 2280 | static int btrfs_interface_init(void) |
| 2281 | { |
| 2282 | return misc_register(&btrfs_misc); |
| 2283 | } |
| 2284 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 2285 | static void btrfs_interface_exit(void) |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 2286 | { |
Greg Kroah-Hartman | f368ed6 | 2015-07-30 15:59:57 -0700 | [diff] [blame] | 2287 | misc_deregister(&btrfs_misc); |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 2288 | } |
| 2289 | |
Anand Jain | 8ae1af3 | 2016-03-10 12:49:14 +0800 | [diff] [blame] | 2290 | static void btrfs_print_mod_info(void) |
David Sterba | 8596560 | 2013-04-30 16:51:59 +0000 | [diff] [blame] | 2291 | { |
| 2292 | printk(KERN_INFO "Btrfs loaded" |
| 2293 | #ifdef CONFIG_BTRFS_DEBUG |
| 2294 | ", debug=on" |
| 2295 | #endif |
Stefan Behrens | 79556c3 | 2013-09-03 15:25:27 +0200 | [diff] [blame] | 2296 | #ifdef CONFIG_BTRFS_ASSERT |
| 2297 | ", assert=on" |
| 2298 | #endif |
David Sterba | 8596560 | 2013-04-30 16:51:59 +0000 | [diff] [blame] | 2299 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
| 2300 | ", integrity-checker=on" |
| 2301 | #endif |
| 2302 | "\n"); |
| 2303 | } |
| 2304 | |
Josef Bacik | dc11dd5 | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 2305 | static int btrfs_run_sanity_tests(void) |
| 2306 | { |
Josef Bacik | 06ea65a | 2013-09-19 16:07:01 -0400 | [diff] [blame] | 2307 | int ret; |
| 2308 | |
Josef Bacik | 294e30f | 2013-10-09 12:00:56 -0400 | [diff] [blame] | 2309 | ret = btrfs_init_test_fs(); |
Josef Bacik | 06ea65a | 2013-09-19 16:07:01 -0400 | [diff] [blame] | 2310 | if (ret) |
| 2311 | return ret; |
Josef Bacik | 294e30f | 2013-10-09 12:00:56 -0400 | [diff] [blame] | 2312 | |
| 2313 | ret = btrfs_test_free_space_cache(); |
| 2314 | if (ret) |
| 2315 | goto out; |
| 2316 | ret = btrfs_test_extent_buffer_operations(); |
| 2317 | if (ret) |
| 2318 | goto out; |
| 2319 | ret = btrfs_test_extent_io(); |
Josef Bacik | aaedb55 | 2013-10-11 14:44:09 -0400 | [diff] [blame] | 2320 | if (ret) |
| 2321 | goto out; |
| 2322 | ret = btrfs_test_inodes(); |
Josef Bacik | faa2dbf | 2014-05-07 17:06:09 -0400 | [diff] [blame] | 2323 | if (ret) |
| 2324 | goto out; |
| 2325 | ret = btrfs_test_qgroups(); |
Omar Sandoval | 7c55ee0 | 2015-09-29 20:50:36 -0700 | [diff] [blame] | 2326 | if (ret) |
| 2327 | goto out; |
| 2328 | ret = btrfs_test_free_space_tree(); |
Josef Bacik | 294e30f | 2013-10-09 12:00:56 -0400 | [diff] [blame] | 2329 | out: |
| 2330 | btrfs_destroy_test_fs(); |
| 2331 | return ret; |
Josef Bacik | dc11dd5 | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 2332 | } |
| 2333 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 2334 | static int __init init_btrfs_fs(void) |
| 2335 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 2336 | int err; |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 2337 | |
Filipe David Borba Manana | 14a958e | 2014-01-12 02:22:46 +0000 | [diff] [blame] | 2338 | err = btrfs_hash_init(); |
| 2339 | if (err) |
| 2340 | return err; |
| 2341 | |
Filipe David Borba Manana | 6354192 | 2014-01-07 11:47:46 +0000 | [diff] [blame] | 2342 | btrfs_props_init(); |
| 2343 | |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 2344 | err = btrfs_init_sysfs(); |
| 2345 | if (err) |
Filipe David Borba Manana | 14a958e | 2014-01-12 02:22:46 +0000 | [diff] [blame] | 2346 | goto free_hash; |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 2347 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 2348 | btrfs_init_compress(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2349 | |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 2350 | err = btrfs_init_cachep(); |
| 2351 | if (err) |
| 2352 | goto free_compress; |
| 2353 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2354 | err = extent_io_init(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 2355 | if (err) |
| 2356 | goto free_cachep; |
| 2357 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2358 | err = extent_map_init(); |
| 2359 | if (err) |
| 2360 | goto free_extent_io; |
| 2361 | |
Miao Xie | 6352b91 | 2012-09-06 04:01:51 -0600 | [diff] [blame] | 2362 | err = ordered_data_init(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 2363 | if (err) |
| 2364 | goto free_extent_map; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 2365 | |
Miao Xie | 6352b91 | 2012-09-06 04:01:51 -0600 | [diff] [blame] | 2366 | err = btrfs_delayed_inode_init(); |
| 2367 | if (err) |
| 2368 | goto free_ordered_data; |
| 2369 | |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 2370 | err = btrfs_auto_defrag_init(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 2371 | if (err) |
| 2372 | goto free_delayed_inode; |
| 2373 | |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2374 | err = btrfs_delayed_ref_init(); |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 2375 | if (err) |
| 2376 | goto free_auto_defrag; |
| 2377 | |
Wang Shilong | b9e9a6c | 2013-08-09 13:25:36 +0800 | [diff] [blame] | 2378 | err = btrfs_prelim_ref_init(); |
| 2379 | if (err) |
David Sterba | af13b492 | 2014-07-30 00:58:37 +0200 | [diff] [blame] | 2380 | goto free_delayed_ref; |
Wang Shilong | b9e9a6c | 2013-08-09 13:25:36 +0800 | [diff] [blame] | 2381 | |
David Sterba | 97eb6b6 | 2014-07-30 00:55:42 +0200 | [diff] [blame] | 2382 | err = btrfs_end_io_wq_init(); |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2383 | if (err) |
David Sterba | af13b492 | 2014-07-30 00:58:37 +0200 | [diff] [blame] | 2384 | goto free_prelim_ref; |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2385 | |
David Sterba | 97eb6b6 | 2014-07-30 00:55:42 +0200 | [diff] [blame] | 2386 | err = btrfs_interface_init(); |
| 2387 | if (err) |
| 2388 | goto free_end_io_wq; |
| 2389 | |
Jan Schmidt | e565d4b | 2012-03-23 17:14:20 +0100 | [diff] [blame] | 2390 | btrfs_init_lockdep(); |
| 2391 | |
Anand Jain | 8ae1af3 | 2016-03-10 12:49:14 +0800 | [diff] [blame] | 2392 | btrfs_print_mod_info(); |
Josef Bacik | dc11dd5 | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 2393 | |
| 2394 | err = btrfs_run_sanity_tests(); |
| 2395 | if (err) |
| 2396 | goto unregister_ioctl; |
| 2397 | |
| 2398 | err = register_filesystem(&btrfs_fs_type); |
| 2399 | if (err) |
| 2400 | goto unregister_ioctl; |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 2401 | |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 2402 | return 0; |
| 2403 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 2404 | unregister_ioctl: |
| 2405 | btrfs_interface_exit(); |
David Sterba | 97eb6b6 | 2014-07-30 00:55:42 +0200 | [diff] [blame] | 2406 | free_end_io_wq: |
| 2407 | btrfs_end_io_wq_exit(); |
Wang Shilong | b9e9a6c | 2013-08-09 13:25:36 +0800 | [diff] [blame] | 2408 | free_prelim_ref: |
| 2409 | btrfs_prelim_ref_exit(); |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2410 | free_delayed_ref: |
| 2411 | btrfs_delayed_ref_exit(); |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 2412 | free_auto_defrag: |
| 2413 | btrfs_auto_defrag_exit(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 2414 | free_delayed_inode: |
| 2415 | btrfs_delayed_inode_exit(); |
Miao Xie | 6352b91 | 2012-09-06 04:01:51 -0600 | [diff] [blame] | 2416 | free_ordered_data: |
| 2417 | ordered_data_exit(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 2418 | free_extent_map: |
| 2419 | extent_map_exit(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2420 | free_extent_io: |
| 2421 | extent_io_exit(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 2422 | free_cachep: |
| 2423 | btrfs_destroy_cachep(); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 2424 | free_compress: |
| 2425 | btrfs_exit_compress(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 2426 | btrfs_exit_sysfs(); |
Filipe David Borba Manana | 14a958e | 2014-01-12 02:22:46 +0000 | [diff] [blame] | 2427 | free_hash: |
| 2428 | btrfs_hash_exit(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 2429 | return err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 2430 | } |
| 2431 | |
| 2432 | static void __exit exit_btrfs_fs(void) |
| 2433 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2434 | btrfs_destroy_cachep(); |
Miao Xie | 78a6184 | 2012-11-21 02:21:28 +0000 | [diff] [blame] | 2435 | btrfs_delayed_ref_exit(); |
Miao Xie | 9247f31 | 2012-11-26 09:24:43 +0000 | [diff] [blame] | 2436 | btrfs_auto_defrag_exit(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 2437 | btrfs_delayed_inode_exit(); |
Wang Shilong | b9e9a6c | 2013-08-09 13:25:36 +0800 | [diff] [blame] | 2438 | btrfs_prelim_ref_exit(); |
Miao Xie | 6352b91 | 2012-09-06 04:01:51 -0600 | [diff] [blame] | 2439 | ordered_data_exit(); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2440 | extent_map_exit(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2441 | extent_io_exit(); |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 2442 | btrfs_interface_exit(); |
Josef Bacik | 5ed5f58 | 2014-10-15 17:19:59 -0400 | [diff] [blame] | 2443 | btrfs_end_io_wq_exit(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 2444 | unregister_filesystem(&btrfs_fs_type); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 2445 | btrfs_exit_sysfs(); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2446 | btrfs_cleanup_fs_uuids(); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 2447 | btrfs_exit_compress(); |
Filipe David Borba Manana | 14a958e | 2014-01-12 02:22:46 +0000 | [diff] [blame] | 2448 | btrfs_hash_exit(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 2449 | } |
| 2450 | |
Filipe David Borba Manana | 60efa5e | 2014-02-01 21:27:56 +0000 | [diff] [blame] | 2451 | late_initcall(init_btrfs_fs); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 2452 | module_exit(exit_btrfs_fs) |
| 2453 | |
| 2454 | MODULE_LICENSE("GPL"); |