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> |
| 29 | #include <linux/smp_lock.h> |
| 30 | #include <linux/backing-dev.h> |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 31 | #include <linux/mount.h> |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 32 | #include <linux/mpage.h> |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 33 | #include <linux/swap.h> |
| 34 | #include <linux/writeback.h> |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 35 | #include <linux/statfs.h> |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 36 | #include <linux/compat.h> |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 37 | #include <linux/parser.h> |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 38 | #include <linux/ctype.h> |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 39 | #include <linux/namei.h> |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 40 | #include <linux/miscdevice.h> |
Qinghuang Feng | 1bcbf31 | 2009-01-15 13:51:03 -0800 | [diff] [blame] | 41 | #include <linux/magic.h> |
Chris Mason | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 42 | #include "compat.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 43 | #include "ctree.h" |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 44 | #include "disk-io.h" |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 45 | #include "transaction.h" |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 46 | #include "btrfs_inode.h" |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 47 | #include "ioctl.h" |
Chris Mason | 3a68637 | 2007-05-24 13:35:57 -0400 | [diff] [blame] | 48 | #include "print-tree.h" |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 49 | #include "xattr.h" |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 50 | #include "volumes.h" |
Chris Mason | b3c3da7 | 2008-07-23 12:12:13 -0400 | [diff] [blame] | 51 | #include "version.h" |
Balaji Rao | be6e8dc | 2008-07-21 02:01:56 +0530 | [diff] [blame] | 52 | #include "export.h" |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 53 | #include "compression.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 54 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 55 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 56 | static struct super_operations btrfs_super_ops; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 57 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 58 | static void btrfs_put_super(struct super_block *sb) |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 59 | { |
| 60 | struct btrfs_root *root = btrfs_sb(sb); |
| 61 | int ret; |
| 62 | |
| 63 | ret = close_ctree(root); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 64 | sb->s_fs_info = NULL; |
| 65 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 66 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 67 | enum { |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 68 | Opt_degraded, Opt_subvol, Opt_device, Opt_nodatasum, Opt_nodatacow, |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 69 | Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 70 | Opt_ssd, Opt_thread_pool, Opt_noacl, Opt_compress, Opt_notreelog, |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 71 | Opt_ratio, Opt_flushoncommit, Opt_err, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 72 | }; |
| 73 | |
| 74 | static match_table_t tokens = { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 75 | {Opt_degraded, "degraded"}, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 76 | {Opt_subvol, "subvol=%s"}, |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 77 | {Opt_device, "device=%s"}, |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 78 | {Opt_nodatasum, "nodatasum"}, |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 79 | {Opt_nodatacow, "nodatacow"}, |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 80 | {Opt_nobarrier, "nobarrier"}, |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 81 | {Opt_max_extent, "max_extent=%s"}, |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 82 | {Opt_max_inline, "max_inline=%s"}, |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 83 | {Opt_alloc_start, "alloc_start=%s"}, |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 84 | {Opt_thread_pool, "thread_pool=%d"}, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 85 | {Opt_compress, "compress"}, |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 86 | {Opt_ssd, "ssd"}, |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 87 | {Opt_noacl, "noacl"}, |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 88 | {Opt_notreelog, "notreelog"}, |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 89 | {Opt_flushoncommit, "flushoncommit"}, |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 90 | {Opt_ratio, "metadata_ratio=%d"}, |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 91 | {Opt_err, NULL}, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 92 | }; |
| 93 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 94 | u64 btrfs_parse_size(char *str) |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 95 | { |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 96 | u64 res; |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 97 | int mult = 1; |
| 98 | char *end; |
| 99 | char last; |
| 100 | |
| 101 | res = simple_strtoul(str, &end, 10); |
| 102 | |
| 103 | last = end[0]; |
| 104 | if (isalpha(last)) { |
| 105 | last = tolower(last); |
| 106 | switch (last) { |
| 107 | case 'g': |
| 108 | mult *= 1024; |
| 109 | case 'm': |
| 110 | mult *= 1024; |
| 111 | case 'k': |
| 112 | mult *= 1024; |
| 113 | } |
| 114 | res = res * mult; |
| 115 | } |
| 116 | return res; |
| 117 | } |
| 118 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 119 | /* |
| 120 | * Regular mount options parser. Everything that is needed only when |
| 121 | * reading in a new superblock is parsed here. |
| 122 | */ |
| 123 | int btrfs_parse_options(struct btrfs_root *root, char *options) |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 124 | { |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 125 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 126 | substring_t args[MAX_OPT_ARGS]; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 127 | char *p, *num; |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 128 | int intarg; |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 129 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 130 | if (!options) |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 131 | return 0; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 132 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 133 | /* |
| 134 | * strsep changes the string, duplicate it because parse_options |
| 135 | * gets called twice |
| 136 | */ |
| 137 | options = kstrdup(options, GFP_NOFS); |
| 138 | if (!options) |
| 139 | return -ENOMEM; |
| 140 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 141 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 142 | while ((p = strsep(&options, ",")) != NULL) { |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 143 | int token; |
| 144 | if (!*p) |
| 145 | continue; |
| 146 | |
| 147 | token = match_token(p, tokens, args); |
| 148 | switch (token) { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 149 | case Opt_degraded: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 150 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
| 151 | btrfs_set_opt(info->mount_opt, DEGRADED); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 152 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 153 | case Opt_subvol: |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 154 | case Opt_device: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 155 | /* |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 156 | * These are parsed by btrfs_parse_early_options |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 157 | * and can be happily ignored here. |
| 158 | */ |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 159 | break; |
| 160 | case Opt_nodatasum: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 161 | printk(KERN_INFO "btrfs: setting nodatacsum\n"); |
| 162 | btrfs_set_opt(info->mount_opt, NODATASUM); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 163 | break; |
| 164 | case Opt_nodatacow: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 165 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
| 166 | btrfs_set_opt(info->mount_opt, NODATACOW); |
| 167 | btrfs_set_opt(info->mount_opt, NODATASUM); |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 168 | break; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 169 | case Opt_compress: |
| 170 | printk(KERN_INFO "btrfs: use compression\n"); |
| 171 | btrfs_set_opt(info->mount_opt, COMPRESS); |
| 172 | break; |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 173 | case Opt_ssd: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 174 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
| 175 | btrfs_set_opt(info->mount_opt, SSD); |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 176 | break; |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 177 | case Opt_nobarrier: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 178 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
| 179 | btrfs_set_opt(info->mount_opt, NOBARRIER); |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 180 | break; |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 181 | case Opt_thread_pool: |
| 182 | intarg = 0; |
| 183 | match_int(&args[0], &intarg); |
| 184 | if (intarg) { |
| 185 | info->thread_pool_size = intarg; |
| 186 | printk(KERN_INFO "btrfs: thread pool %d\n", |
| 187 | info->thread_pool_size); |
| 188 | } |
| 189 | break; |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 190 | case Opt_max_extent: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 191 | num = match_strdup(&args[0]); |
| 192 | if (num) { |
| 193 | info->max_extent = btrfs_parse_size(num); |
| 194 | kfree(num); |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 195 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 196 | info->max_extent = max_t(u64, |
| 197 | info->max_extent, root->sectorsize); |
| 198 | printk(KERN_INFO "btrfs: max_extent at %llu\n", |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 199 | (unsigned long long)info->max_extent); |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 200 | } |
| 201 | break; |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 202 | case Opt_max_inline: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 203 | num = match_strdup(&args[0]); |
| 204 | if (num) { |
| 205 | info->max_inline = btrfs_parse_size(num); |
| 206 | kfree(num); |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 207 | |
Chris Mason | 15ada04 | 2008-06-11 16:51:38 -0400 | [diff] [blame] | 208 | if (info->max_inline) { |
| 209 | info->max_inline = max_t(u64, |
| 210 | info->max_inline, |
| 211 | root->sectorsize); |
| 212 | } |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 213 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 214 | (unsigned long long)info->max_inline); |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 215 | } |
| 216 | break; |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 217 | case Opt_alloc_start: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 218 | num = match_strdup(&args[0]); |
| 219 | if (num) { |
| 220 | info->alloc_start = btrfs_parse_size(num); |
| 221 | kfree(num); |
| 222 | printk(KERN_INFO |
| 223 | "btrfs: allocations start at %llu\n", |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 224 | (unsigned long long)info->alloc_start); |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 225 | } |
| 226 | break; |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 227 | case Opt_noacl: |
| 228 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; |
| 229 | break; |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 230 | case Opt_notreelog: |
| 231 | printk(KERN_INFO "btrfs: disabling tree log\n"); |
| 232 | btrfs_set_opt(info->mount_opt, NOTREELOG); |
| 233 | break; |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 234 | case Opt_flushoncommit: |
| 235 | printk(KERN_INFO "btrfs: turning on flush-on-commit\n"); |
| 236 | btrfs_set_opt(info->mount_opt, FLUSHONCOMMIT); |
| 237 | break; |
Josef Bacik | 97e728d | 2009-04-21 17:40:57 -0400 | [diff] [blame] | 238 | case Opt_ratio: |
| 239 | intarg = 0; |
| 240 | match_int(&args[0], &intarg); |
| 241 | if (intarg) { |
| 242 | info->metadata_ratio = intarg; |
| 243 | printk(KERN_INFO "btrfs: metadata ratio %d\n", |
| 244 | info->metadata_ratio); |
| 245 | } |
| 246 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 247 | default: |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 248 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 249 | } |
| 250 | } |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 251 | kfree(options); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 252 | return 0; |
| 253 | } |
| 254 | |
| 255 | /* |
| 256 | * Parse mount options that are required early in the mount process. |
| 257 | * |
| 258 | * All other options will be parsed on much later in the mount process and |
| 259 | * only when we need to allocate a new super block. |
| 260 | */ |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 261 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 262 | void *holder, char **subvol_name, |
| 263 | struct btrfs_fs_devices **fs_devices) |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 264 | { |
| 265 | substring_t args[MAX_OPT_ARGS]; |
| 266 | char *opts, *p; |
| 267 | int error = 0; |
| 268 | |
| 269 | if (!options) |
| 270 | goto out; |
| 271 | |
| 272 | /* |
| 273 | * strsep changes the string, duplicate it because parse_options |
| 274 | * gets called twice |
| 275 | */ |
| 276 | opts = kstrdup(options, GFP_KERNEL); |
| 277 | if (!opts) |
| 278 | return -ENOMEM; |
| 279 | |
| 280 | while ((p = strsep(&opts, ",")) != NULL) { |
| 281 | int token; |
| 282 | if (!*p) |
| 283 | continue; |
| 284 | |
| 285 | token = match_token(p, tokens, args); |
| 286 | switch (token) { |
| 287 | case Opt_subvol: |
| 288 | *subvol_name = match_strdup(&args[0]); |
| 289 | break; |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 290 | case Opt_device: |
| 291 | error = btrfs_scan_one_device(match_strdup(&args[0]), |
| 292 | flags, holder, fs_devices); |
| 293 | if (error) |
| 294 | goto out_free_opts; |
| 295 | break; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 296 | default: |
| 297 | break; |
| 298 | } |
| 299 | } |
| 300 | |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 301 | out_free_opts: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 302 | kfree(opts); |
| 303 | out: |
| 304 | /* |
| 305 | * If no subvolume name is specified we use the default one. Allocate |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 306 | * a copy of the string "." here so that code later in the |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 307 | * mount path doesn't care if it's the default volume or another one. |
| 308 | */ |
| 309 | if (!*subvol_name) { |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 310 | *subvol_name = kstrdup(".", GFP_KERNEL); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 311 | if (!*subvol_name) |
| 312 | return -ENOMEM; |
| 313 | } |
| 314 | return error; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 315 | } |
| 316 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 317 | static int btrfs_fill_super(struct super_block *sb, |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 318 | struct btrfs_fs_devices *fs_devices, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 319 | void *data, int silent) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 320 | { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 321 | struct inode *inode; |
| 322 | struct dentry *root_dentry; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 323 | struct btrfs_super_block *disk_super; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 324 | struct btrfs_root *tree_root; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 325 | struct btrfs_inode *bi; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 326 | int err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 327 | |
| 328 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 329 | sb->s_magic = BTRFS_SUPER_MAGIC; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 330 | sb->s_op = &btrfs_super_ops; |
Balaji Rao | be6e8dc | 2008-07-21 02:01:56 +0530 | [diff] [blame] | 331 | sb->s_export_op = &btrfs_export_ops; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 332 | sb->s_xattr = btrfs_xattr_handlers; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 333 | sb->s_time_gran = 1; |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 334 | sb->s_flags |= MS_POSIXACL; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 335 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 336 | tree_root = open_ctree(sb, fs_devices, (char *)data); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 337 | |
Yan | e58ca02 | 2008-04-01 11:21:34 -0400 | [diff] [blame] | 338 | if (IS_ERR(tree_root)) { |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 339 | printk("btrfs: open_ctree failed\n"); |
Yan | e58ca02 | 2008-04-01 11:21:34 -0400 | [diff] [blame] | 340 | return PTR_ERR(tree_root); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 341 | } |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 342 | sb->s_fs_info = tree_root; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 343 | disk_super = &tree_root->fs_info->super_copy; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 344 | inode = btrfs_iget_locked(sb, BTRFS_FIRST_FREE_OBJECTID, |
| 345 | tree_root->fs_info->fs_root); |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 346 | bi = BTRFS_I(inode); |
| 347 | bi->location.objectid = inode->i_ino; |
| 348 | bi->location.offset = 0; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 349 | bi->root = tree_root->fs_info->fs_root; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 350 | |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 351 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
| 352 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 353 | if (!inode) { |
| 354 | err = -ENOMEM; |
| 355 | goto fail_close; |
| 356 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 357 | if (inode->i_state & I_NEW) { |
| 358 | btrfs_read_locked_inode(inode); |
| 359 | unlock_new_inode(inode); |
| 360 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 361 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 362 | root_dentry = d_alloc_root(inode); |
| 363 | if (!root_dentry) { |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 364 | iput(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 365 | err = -ENOMEM; |
| 366 | goto fail_close; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 367 | } |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 368 | #if 0 |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 369 | /* this does the super kobj at the same time */ |
| 370 | err = btrfs_sysfs_add_super(tree_root->fs_info); |
| 371 | if (err) |
| 372 | goto fail_close; |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 373 | #endif |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 374 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 375 | sb->s_root = root_dentry; |
Chris Mason | 6885f30 | 2008-02-20 16:11:05 -0500 | [diff] [blame] | 376 | |
Chris Mason | 6885f30 | 2008-02-20 16:11:05 -0500 | [diff] [blame] | 377 | save_mount_options(sb, data); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 378 | return 0; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 379 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 380 | fail_close: |
| 381 | close_ctree(tree_root); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 382 | return err; |
| 383 | } |
| 384 | |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 385 | int btrfs_sync_fs(struct super_block *sb, int wait) |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 386 | { |
| 387 | struct btrfs_trans_handle *trans; |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 388 | struct btrfs_root *root = btrfs_sb(sb); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 389 | int ret; |
Chris Mason | df2ce34 | 2007-03-23 11:00:45 -0400 | [diff] [blame] | 390 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 391 | if (sb->s_flags & MS_RDONLY) |
| 392 | return 0; |
| 393 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 394 | sb->s_dirt = 0; |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 395 | if (!wait) { |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 396 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 397 | return 0; |
| 398 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 399 | |
| 400 | btrfs_start_delalloc_inodes(root); |
| 401 | btrfs_wait_ordered_extents(root, 0); |
| 402 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 403 | trans = btrfs_start_transaction(root, 1); |
| 404 | ret = btrfs_commit_transaction(trans, root); |
| 405 | sb->s_dirt = 0; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 406 | return ret; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 407 | } |
| 408 | |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 409 | static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
| 410 | { |
| 411 | struct btrfs_root *root = btrfs_sb(vfs->mnt_sb); |
| 412 | struct btrfs_fs_info *info = root->fs_info; |
| 413 | |
| 414 | if (btrfs_test_opt(root, DEGRADED)) |
| 415 | seq_puts(seq, ",degraded"); |
| 416 | if (btrfs_test_opt(root, NODATASUM)) |
| 417 | seq_puts(seq, ",nodatasum"); |
| 418 | if (btrfs_test_opt(root, NODATACOW)) |
| 419 | seq_puts(seq, ",nodatacow"); |
| 420 | if (btrfs_test_opt(root, NOBARRIER)) |
| 421 | seq_puts(seq, ",nobarrier"); |
| 422 | if (info->max_extent != (u64)-1) |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 423 | seq_printf(seq, ",max_extent=%llu", |
| 424 | (unsigned long long)info->max_extent); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 425 | if (info->max_inline != 8192 * 1024) |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 426 | seq_printf(seq, ",max_inline=%llu", |
| 427 | (unsigned long long)info->max_inline); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 428 | if (info->alloc_start != 0) |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 429 | seq_printf(seq, ",alloc_start=%llu", |
| 430 | (unsigned long long)info->alloc_start); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 431 | if (info->thread_pool_size != min_t(unsigned long, |
| 432 | num_online_cpus() + 2, 8)) |
| 433 | seq_printf(seq, ",thread_pool=%d", info->thread_pool_size); |
| 434 | if (btrfs_test_opt(root, COMPRESS)) |
| 435 | seq_puts(seq, ",compress"); |
| 436 | if (btrfs_test_opt(root, SSD)) |
| 437 | seq_puts(seq, ",ssd"); |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 438 | if (btrfs_test_opt(root, NOTREELOG)) |
Sage Weil | dccae99 | 2009-04-02 16:59:01 -0400 | [diff] [blame] | 439 | seq_puts(seq, ",no-treelog"); |
| 440 | if (btrfs_test_opt(root, FLUSHONCOMMIT)) |
| 441 | seq_puts(seq, ",flush-on-commit"); |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 442 | if (!(root->fs_info->sb->s_flags & MS_POSIXACL)) |
| 443 | seq_puts(seq, ",noacl"); |
| 444 | return 0; |
| 445 | } |
| 446 | |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 447 | static void btrfs_write_super(struct super_block *sb) |
| 448 | { |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 449 | sb->s_dirt = 0; |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 450 | } |
| 451 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 452 | static int btrfs_test_super(struct super_block *s, void *data) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 453 | { |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 454 | struct btrfs_fs_devices *test_fs_devices = data; |
| 455 | struct btrfs_root *root = btrfs_sb(s); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 456 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 457 | return root->fs_info->fs_devices == test_fs_devices; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 458 | } |
| 459 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 460 | /* |
| 461 | * Find a superblock for the given device / mount point. |
| 462 | * |
| 463 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions |
| 464 | * for multiple device setup. Make sure to keep it in sync. |
| 465 | */ |
| 466 | static int btrfs_get_sb(struct file_system_type *fs_type, int flags, |
| 467 | const char *dev_name, void *data, struct vfsmount *mnt) |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 468 | { |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 469 | char *subvol_name = NULL; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 470 | struct block_device *bdev = NULL; |
| 471 | struct super_block *s; |
| 472 | struct dentry *root; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 473 | struct btrfs_fs_devices *fs_devices = NULL; |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 474 | fmode_t mode = FMODE_READ; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 475 | int error = 0; |
| 476 | |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 477 | if (!(flags & MS_RDONLY)) |
| 478 | mode |= FMODE_WRITE; |
| 479 | |
| 480 | error = btrfs_parse_early_options(data, mode, fs_type, |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 481 | &subvol_name, &fs_devices); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 482 | if (error) |
Shen Feng | 1f48366 | 2009-01-05 15:43:42 -0500 | [diff] [blame] | 483 | return error; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 484 | |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 485 | error = btrfs_scan_one_device(dev_name, mode, fs_type, &fs_devices); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 486 | if (error) |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 487 | goto error_free_subvol_name; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 488 | |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 489 | error = btrfs_open_devices(fs_devices, mode, fs_type); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 490 | if (error) |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 491 | goto error_free_subvol_name; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 492 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 493 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { |
| 494 | error = -EACCES; |
| 495 | goto error_close_devices; |
| 496 | } |
| 497 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 498 | bdev = fs_devices->latest_bdev; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 499 | s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 500 | if (IS_ERR(s)) |
| 501 | goto error_s; |
| 502 | |
| 503 | if (s->s_root) { |
| 504 | if ((flags ^ s->s_flags) & MS_RDONLY) { |
Al Viro | 6f5bbff | 2009-05-06 01:34:22 -0400 | [diff] [blame^] | 505 | deactivate_locked_super(s); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 506 | error = -EBUSY; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 507 | goto error_close_devices; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 508 | } |
| 509 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 510 | btrfs_close_devices(fs_devices); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 511 | } else { |
| 512 | char b[BDEVNAME_SIZE]; |
| 513 | |
| 514 | s->s_flags = flags; |
| 515 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 516 | error = btrfs_fill_super(s, fs_devices, data, |
| 517 | flags & MS_SILENT ? 1 : 0); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 518 | if (error) { |
Al Viro | 6f5bbff | 2009-05-06 01:34:22 -0400 | [diff] [blame^] | 519 | deactivate_locked_super(s); |
Shen Feng | 1f48366 | 2009-01-05 15:43:42 -0500 | [diff] [blame] | 520 | goto error_free_subvol_name; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 521 | } |
| 522 | |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 523 | btrfs_sb(s)->fs_info->bdev_holder = fs_type; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 524 | s->s_flags |= MS_ACTIVE; |
| 525 | } |
| 526 | |
David Woodhouse | 76fcef1 | 2008-08-19 16:49:35 +0100 | [diff] [blame] | 527 | if (!strcmp(subvol_name, ".")) |
| 528 | root = dget(s->s_root); |
| 529 | else { |
| 530 | mutex_lock(&s->s_root->d_inode->i_mutex); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 531 | root = lookup_one_len(subvol_name, s->s_root, |
| 532 | strlen(subvol_name)); |
David Woodhouse | 76fcef1 | 2008-08-19 16:49:35 +0100 | [diff] [blame] | 533 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 534 | |
David Woodhouse | 76fcef1 | 2008-08-19 16:49:35 +0100 | [diff] [blame] | 535 | if (IS_ERR(root)) { |
Al Viro | 6f5bbff | 2009-05-06 01:34:22 -0400 | [diff] [blame^] | 536 | deactivate_locked_super(s); |
David Woodhouse | 76fcef1 | 2008-08-19 16:49:35 +0100 | [diff] [blame] | 537 | error = PTR_ERR(root); |
Shen Feng | 1f48366 | 2009-01-05 15:43:42 -0500 | [diff] [blame] | 538 | goto error_free_subvol_name; |
David Woodhouse | 76fcef1 | 2008-08-19 16:49:35 +0100 | [diff] [blame] | 539 | } |
| 540 | if (!root->d_inode) { |
| 541 | dput(root); |
Al Viro | 6f5bbff | 2009-05-06 01:34:22 -0400 | [diff] [blame^] | 542 | deactivate_locked_super(s); |
David Woodhouse | 76fcef1 | 2008-08-19 16:49:35 +0100 | [diff] [blame] | 543 | error = -ENXIO; |
Shen Feng | 1f48366 | 2009-01-05 15:43:42 -0500 | [diff] [blame] | 544 | goto error_free_subvol_name; |
David Woodhouse | 76fcef1 | 2008-08-19 16:49:35 +0100 | [diff] [blame] | 545 | } |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 546 | } |
| 547 | |
| 548 | mnt->mnt_sb = s; |
| 549 | mnt->mnt_root = root; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 550 | |
| 551 | kfree(subvol_name); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 552 | return 0; |
| 553 | |
| 554 | error_s: |
| 555 | error = PTR_ERR(s); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 556 | error_close_devices: |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 557 | btrfs_close_devices(fs_devices); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 558 | error_free_subvol_name: |
| 559 | kfree(subvol_name); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 560 | return error; |
| 561 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 562 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 563 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
| 564 | { |
| 565 | struct btrfs_root *root = btrfs_sb(sb); |
| 566 | int ret; |
| 567 | |
Chris Mason | b288052 | 2009-02-12 09:37:35 -0500 | [diff] [blame] | 568 | ret = btrfs_parse_options(root, data); |
| 569 | if (ret) |
| 570 | return -EINVAL; |
| 571 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 572 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 573 | return 0; |
| 574 | |
| 575 | if (*flags & MS_RDONLY) { |
| 576 | sb->s_flags |= MS_RDONLY; |
| 577 | |
| 578 | ret = btrfs_commit_super(root); |
| 579 | WARN_ON(ret); |
| 580 | } else { |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 581 | if (root->fs_info->fs_devices->rw_devices == 0) |
| 582 | return -EACCES; |
| 583 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 584 | if (btrfs_super_log_root(&root->fs_info->super_copy) != 0) |
| 585 | return -EINVAL; |
| 586 | |
| 587 | ret = btrfs_cleanup_reloc_trees(root); |
| 588 | WARN_ON(ret); |
| 589 | |
| 590 | ret = btrfs_cleanup_fs_roots(root->fs_info); |
| 591 | WARN_ON(ret); |
| 592 | |
| 593 | sb->s_flags &= ~MS_RDONLY; |
| 594 | } |
| 595 | |
| 596 | return 0; |
| 597 | } |
| 598 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 599 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 600 | { |
| 601 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); |
Chris Mason | 4b52dff | 2007-06-26 10:06:50 -0400 | [diff] [blame] | 602 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 603 | int bits = dentry->d_sb->s_blocksize_bits; |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 604 | __be32 *fsid = (__be32 *)root->fs_info->fsid; |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 605 | |
| 606 | buf->f_namelen = BTRFS_NAME_LEN; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 607 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
| 608 | buf->f_bfree = buf->f_blocks - |
| 609 | (btrfs_super_bytes_used(disk_super) >> bits); |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 610 | buf->f_bavail = buf->f_bfree; |
| 611 | buf->f_bsize = dentry->d_sb->s_blocksize; |
| 612 | buf->f_type = BTRFS_SUPER_MAGIC; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 613 | |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 614 | /* We treat it as constant endianness (it doesn't matter _which_) |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 615 | because we want the fsid to come out the same whether mounted |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 616 | on a big-endian or little-endian host */ |
| 617 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); |
| 618 | 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] | 619 | /* Mask in the root object ID too, to disambiguate subvols */ |
| 620 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; |
| 621 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; |
| 622 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 623 | return 0; |
| 624 | } |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 625 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 626 | static struct file_system_type btrfs_fs_type = { |
| 627 | .owner = THIS_MODULE, |
| 628 | .name = "btrfs", |
| 629 | .get_sb = btrfs_get_sb, |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 630 | .kill_sb = kill_anon_super, |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 631 | .fs_flags = FS_REQUIRES_DEV, |
| 632 | }; |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 633 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 634 | /* |
| 635 | * used by btrfsctl to scan devices when no FS is mounted |
| 636 | */ |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 637 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
| 638 | unsigned long arg) |
| 639 | { |
| 640 | struct btrfs_ioctl_vol_args *vol; |
| 641 | struct btrfs_fs_devices *fs_devices; |
Chris Mason | c071fcf | 2009-01-16 11:59:08 -0500 | [diff] [blame] | 642 | int ret = -ENOTTY; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 643 | |
Chris Mason | e441d54 | 2009-01-05 16:57:23 -0500 | [diff] [blame] | 644 | if (!capable(CAP_SYS_ADMIN)) |
| 645 | return -EPERM; |
| 646 | |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 647 | vol = memdup_user((void __user *)arg, sizeof(*vol)); |
| 648 | if (IS_ERR(vol)) |
| 649 | return PTR_ERR(vol); |
Chris Mason | c071fcf | 2009-01-16 11:59:08 -0500 | [diff] [blame] | 650 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 651 | switch (cmd) { |
| 652 | case BTRFS_IOC_SCAN_DEV: |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 653 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 654 | &btrfs_fs_type, &fs_devices); |
| 655 | break; |
| 656 | } |
Li Zefan | dae7b66 | 2009-04-08 15:06:54 +0800 | [diff] [blame] | 657 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 658 | kfree(vol); |
Linda Knippers | f819d83 | 2008-06-09 22:17:11 -0400 | [diff] [blame] | 659 | return ret; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 660 | } |
| 661 | |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 662 | static int btrfs_freeze(struct super_block *sb) |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 663 | { |
| 664 | struct btrfs_root *root = btrfs_sb(sb); |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 665 | mutex_lock(&root->fs_info->transaction_kthread_mutex); |
| 666 | mutex_lock(&root->fs_info->cleaner_mutex); |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 667 | return 0; |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 668 | } |
| 669 | |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 670 | static int btrfs_unfreeze(struct super_block *sb) |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 671 | { |
| 672 | struct btrfs_root *root = btrfs_sb(sb); |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 673 | mutex_unlock(&root->fs_info->cleaner_mutex); |
| 674 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 675 | return 0; |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 676 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 677 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 678 | static struct super_operations btrfs_super_ops = { |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 679 | .delete_inode = btrfs_delete_inode, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 680 | .put_super = btrfs_put_super, |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 681 | .write_super = btrfs_write_super, |
| 682 | .sync_fs = btrfs_sync_fs, |
Eric Paris | a9572a1 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 683 | .show_options = btrfs_show_options, |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 684 | .write_inode = btrfs_write_inode, |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 685 | .dirty_inode = btrfs_dirty_inode, |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 686 | .alloc_inode = btrfs_alloc_inode, |
| 687 | .destroy_inode = btrfs_destroy_inode, |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 688 | .statfs = btrfs_statfs, |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 689 | .remount_fs = btrfs_remount, |
Linus Torvalds | 0176260 | 2009-01-10 06:09:52 -0800 | [diff] [blame] | 690 | .freeze_fs = btrfs_freeze, |
| 691 | .unfreeze_fs = btrfs_unfreeze, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 692 | }; |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 693 | |
| 694 | static const struct file_operations btrfs_ctl_fops = { |
| 695 | .unlocked_ioctl = btrfs_control_ioctl, |
| 696 | .compat_ioctl = btrfs_control_ioctl, |
| 697 | .owner = THIS_MODULE, |
| 698 | }; |
| 699 | |
| 700 | static struct miscdevice btrfs_misc = { |
| 701 | .minor = MISC_DYNAMIC_MINOR, |
| 702 | .name = "btrfs-control", |
| 703 | .fops = &btrfs_ctl_fops |
| 704 | }; |
| 705 | |
| 706 | static int btrfs_interface_init(void) |
| 707 | { |
| 708 | return misc_register(&btrfs_misc); |
| 709 | } |
| 710 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 711 | static void btrfs_interface_exit(void) |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 712 | { |
| 713 | if (misc_deregister(&btrfs_misc) < 0) |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 714 | printk(KERN_INFO "misc_deregister failed for control device"); |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 715 | } |
| 716 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 717 | static int __init init_btrfs_fs(void) |
| 718 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 719 | int err; |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 720 | |
| 721 | err = btrfs_init_sysfs(); |
| 722 | if (err) |
| 723 | return err; |
| 724 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 725 | err = btrfs_init_cachep(); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 726 | if (err) |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 727 | goto free_sysfs; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 728 | |
| 729 | err = extent_io_init(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 730 | if (err) |
| 731 | goto free_cachep; |
| 732 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 733 | err = extent_map_init(); |
| 734 | if (err) |
| 735 | goto free_extent_io; |
| 736 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 737 | err = btrfs_interface_init(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 738 | if (err) |
| 739 | goto free_extent_map; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 740 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 741 | err = register_filesystem(&btrfs_fs_type); |
| 742 | if (err) |
| 743 | goto unregister_ioctl; |
Chris Mason | b3c3da7 | 2008-07-23 12:12:13 -0400 | [diff] [blame] | 744 | |
| 745 | printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 746 | return 0; |
| 747 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 748 | unregister_ioctl: |
| 749 | btrfs_interface_exit(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 750 | free_extent_map: |
| 751 | extent_map_exit(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 752 | free_extent_io: |
| 753 | extent_io_exit(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 754 | free_cachep: |
| 755 | btrfs_destroy_cachep(); |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 756 | free_sysfs: |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 757 | btrfs_exit_sysfs(); |
| 758 | return err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 759 | } |
| 760 | |
| 761 | static void __exit exit_btrfs_fs(void) |
| 762 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 763 | btrfs_destroy_cachep(); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 764 | extent_map_exit(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 765 | extent_io_exit(); |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 766 | btrfs_interface_exit(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 767 | unregister_filesystem(&btrfs_fs_type); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 768 | btrfs_exit_sysfs(); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 769 | btrfs_cleanup_fs_uuids(); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 770 | btrfs_zlib_exit(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 771 | } |
| 772 | |
| 773 | module_init(init_btrfs_fs) |
| 774 | module_exit(exit_btrfs_fs) |
| 775 | |
| 776 | MODULE_LICENSE("GPL"); |