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> |
| 27 | #include <linux/string.h> |
| 28 | #include <linux/smp_lock.h> |
| 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> |
Chris Mason | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 40 | #include <linux/version.h> |
| 41 | #include "compat.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 42 | #include "ctree.h" |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 43 | #include "disk-io.h" |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 44 | #include "transaction.h" |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 45 | #include "btrfs_inode.h" |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 46 | #include "ioctl.h" |
Chris Mason | 3a68637 | 2007-05-24 13:35:57 -0400 | [diff] [blame] | 47 | #include "print-tree.h" |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 48 | #include "xattr.h" |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 49 | #include "volumes.h" |
Chris Mason | b3c3da7 | 2008-07-23 12:12:13 -0400 | [diff] [blame] | 50 | #include "version.h" |
Balaji Rao | be6e8dc | 2008-07-21 02:01:56 +0530 | [diff] [blame] | 51 | #include "export.h" |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 52 | #include "compression.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 53 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 54 | #define BTRFS_SUPER_MAGIC 0x9123683E |
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 | |
| 58 | static void btrfs_put_super (struct super_block * sb) |
| 59 | { |
| 60 | struct btrfs_root *root = btrfs_sb(sb); |
| 61 | int ret; |
| 62 | |
| 63 | ret = close_ctree(root); |
| 64 | if (ret) { |
| 65 | printk("close ctree returns %d\n", ret); |
| 66 | } |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame^] | 67 | #if 0 |
| 68 | btrfs_sysfs_del_super(root->fs_info); |
| 69 | #endif |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 70 | sb->s_fs_info = NULL; |
| 71 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 72 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 73 | enum { |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 74 | Opt_degraded, Opt_subvol, Opt_device, Opt_nodatasum, Opt_nodatacow, |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 75 | Opt_max_extent, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 76 | Opt_ssd, Opt_thread_pool, Opt_noacl, Opt_compress, Opt_err, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 77 | }; |
| 78 | |
| 79 | static match_table_t tokens = { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 80 | {Opt_degraded, "degraded"}, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 81 | {Opt_subvol, "subvol=%s"}, |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 82 | {Opt_device, "device=%s"}, |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 83 | {Opt_nodatasum, "nodatasum"}, |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 84 | {Opt_nodatacow, "nodatacow"}, |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 85 | {Opt_nobarrier, "nobarrier"}, |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 86 | {Opt_max_extent, "max_extent=%s"}, |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 87 | {Opt_max_inline, "max_inline=%s"}, |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 88 | {Opt_alloc_start, "alloc_start=%s"}, |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 89 | {Opt_thread_pool, "thread_pool=%d"}, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 90 | {Opt_compress, "compress"}, |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 91 | {Opt_ssd, "ssd"}, |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 92 | {Opt_noacl, "noacl"}, |
| 93 | {Opt_err, NULL}, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 94 | }; |
| 95 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 96 | u64 btrfs_parse_size(char *str) |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 97 | { |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 98 | u64 res; |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 99 | int mult = 1; |
| 100 | char *end; |
| 101 | char last; |
| 102 | |
| 103 | res = simple_strtoul(str, &end, 10); |
| 104 | |
| 105 | last = end[0]; |
| 106 | if (isalpha(last)) { |
| 107 | last = tolower(last); |
| 108 | switch (last) { |
| 109 | case 'g': |
| 110 | mult *= 1024; |
| 111 | case 'm': |
| 112 | mult *= 1024; |
| 113 | case 'k': |
| 114 | mult *= 1024; |
| 115 | } |
| 116 | res = res * mult; |
| 117 | } |
| 118 | return res; |
| 119 | } |
| 120 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 121 | /* |
| 122 | * Regular mount options parser. Everything that is needed only when |
| 123 | * reading in a new superblock is parsed here. |
| 124 | */ |
| 125 | int btrfs_parse_options(struct btrfs_root *root, char *options) |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 126 | { |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 127 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 128 | substring_t args[MAX_OPT_ARGS]; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 129 | char *p, *num; |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 130 | int intarg; |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 131 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 132 | if (!options) |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 133 | return 0; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 134 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 135 | /* |
| 136 | * strsep changes the string, duplicate it because parse_options |
| 137 | * gets called twice |
| 138 | */ |
| 139 | options = kstrdup(options, GFP_NOFS); |
| 140 | if (!options) |
| 141 | return -ENOMEM; |
| 142 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 143 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 144 | while ((p = strsep(&options, ",")) != NULL) { |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 145 | int token; |
| 146 | if (!*p) |
| 147 | continue; |
| 148 | |
| 149 | token = match_token(p, tokens, args); |
| 150 | switch (token) { |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 151 | case Opt_degraded: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 152 | printk(KERN_INFO "btrfs: allowing degraded mounts\n"); |
| 153 | btrfs_set_opt(info->mount_opt, DEGRADED); |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 154 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 155 | case Opt_subvol: |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 156 | case Opt_device: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 157 | /* |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 158 | * These are parsed by btrfs_parse_early_options |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 159 | * and can be happily ignored here. |
| 160 | */ |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 161 | break; |
| 162 | case Opt_nodatasum: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 163 | printk(KERN_INFO "btrfs: setting nodatacsum\n"); |
| 164 | btrfs_set_opt(info->mount_opt, NODATASUM); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 165 | break; |
| 166 | case Opt_nodatacow: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 167 | printk(KERN_INFO "btrfs: setting nodatacow\n"); |
| 168 | btrfs_set_opt(info->mount_opt, NODATACOW); |
| 169 | btrfs_set_opt(info->mount_opt, NODATASUM); |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 170 | break; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 171 | case Opt_compress: |
| 172 | printk(KERN_INFO "btrfs: use compression\n"); |
| 173 | btrfs_set_opt(info->mount_opt, COMPRESS); |
| 174 | break; |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 175 | case Opt_ssd: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 176 | printk(KERN_INFO "btrfs: use ssd allocation scheme\n"); |
| 177 | btrfs_set_opt(info->mount_opt, SSD); |
Chris Mason | e18e480 | 2008-01-18 10:54:22 -0500 | [diff] [blame] | 178 | break; |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 179 | case Opt_nobarrier: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 180 | printk(KERN_INFO "btrfs: turning off barriers\n"); |
| 181 | btrfs_set_opt(info->mount_opt, NOBARRIER); |
Chris Mason | 21ad10c | 2008-01-09 09:23:21 -0500 | [diff] [blame] | 182 | break; |
Chris Mason | 4543df7 | 2008-06-11 21:47:56 -0400 | [diff] [blame] | 183 | case Opt_thread_pool: |
| 184 | intarg = 0; |
| 185 | match_int(&args[0], &intarg); |
| 186 | if (intarg) { |
| 187 | info->thread_pool_size = intarg; |
| 188 | printk(KERN_INFO "btrfs: thread pool %d\n", |
| 189 | info->thread_pool_size); |
| 190 | } |
| 191 | break; |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 192 | case Opt_max_extent: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 193 | num = match_strdup(&args[0]); |
| 194 | if (num) { |
| 195 | info->max_extent = btrfs_parse_size(num); |
| 196 | kfree(num); |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 197 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 198 | info->max_extent = max_t(u64, |
| 199 | info->max_extent, root->sectorsize); |
| 200 | printk(KERN_INFO "btrfs: max_extent at %llu\n", |
| 201 | info->max_extent); |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 202 | } |
| 203 | break; |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 204 | case Opt_max_inline: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 205 | num = match_strdup(&args[0]); |
| 206 | if (num) { |
| 207 | info->max_inline = btrfs_parse_size(num); |
| 208 | kfree(num); |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 209 | |
Chris Mason | 15ada04 | 2008-06-11 16:51:38 -0400 | [diff] [blame] | 210 | if (info->max_inline) { |
| 211 | info->max_inline = max_t(u64, |
| 212 | info->max_inline, |
| 213 | root->sectorsize); |
| 214 | } |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 215 | printk(KERN_INFO "btrfs: max_inline at %llu\n", |
| 216 | info->max_inline); |
Chris Mason | 6f568d3 | 2008-01-29 16:03:38 -0500 | [diff] [blame] | 217 | } |
| 218 | break; |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 219 | case Opt_alloc_start: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 220 | num = match_strdup(&args[0]); |
| 221 | if (num) { |
| 222 | info->alloc_start = btrfs_parse_size(num); |
| 223 | kfree(num); |
| 224 | printk(KERN_INFO |
| 225 | "btrfs: allocations start at %llu\n", |
| 226 | info->alloc_start); |
Chris Mason | 8f662a7 | 2008-01-02 10:01:11 -0500 | [diff] [blame] | 227 | } |
| 228 | break; |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 229 | case Opt_noacl: |
| 230 | root->fs_info->sb->s_flags &= ~MS_POSIXACL; |
| 231 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 232 | default: |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 233 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 234 | } |
| 235 | } |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 236 | kfree(options); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 237 | return 0; |
| 238 | } |
| 239 | |
| 240 | /* |
| 241 | * Parse mount options that are required early in the mount process. |
| 242 | * |
| 243 | * All other options will be parsed on much later in the mount process and |
| 244 | * only when we need to allocate a new super block. |
| 245 | */ |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 246 | static int btrfs_parse_early_options(const char *options, fmode_t flags, |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 247 | void *holder, char **subvol_name, |
| 248 | struct btrfs_fs_devices **fs_devices) |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 249 | { |
| 250 | substring_t args[MAX_OPT_ARGS]; |
| 251 | char *opts, *p; |
| 252 | int error = 0; |
| 253 | |
| 254 | if (!options) |
| 255 | goto out; |
| 256 | |
| 257 | /* |
| 258 | * strsep changes the string, duplicate it because parse_options |
| 259 | * gets called twice |
| 260 | */ |
| 261 | opts = kstrdup(options, GFP_KERNEL); |
| 262 | if (!opts) |
| 263 | return -ENOMEM; |
| 264 | |
| 265 | while ((p = strsep(&opts, ",")) != NULL) { |
| 266 | int token; |
| 267 | if (!*p) |
| 268 | continue; |
| 269 | |
| 270 | token = match_token(p, tokens, args); |
| 271 | switch (token) { |
| 272 | case Opt_subvol: |
| 273 | *subvol_name = match_strdup(&args[0]); |
| 274 | break; |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 275 | case Opt_device: |
| 276 | error = btrfs_scan_one_device(match_strdup(&args[0]), |
| 277 | flags, holder, fs_devices); |
| 278 | if (error) |
| 279 | goto out_free_opts; |
| 280 | break; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 281 | default: |
| 282 | break; |
| 283 | } |
| 284 | } |
| 285 | |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 286 | out_free_opts: |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 287 | kfree(opts); |
| 288 | out: |
| 289 | /* |
| 290 | * If no subvolume name is specified we use the default one. Allocate |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 291 | * a copy of the string "." here so that code later in the |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 292 | * mount path doesn't care if it's the default volume or another one. |
| 293 | */ |
| 294 | if (!*subvol_name) { |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 295 | *subvol_name = kstrdup(".", GFP_KERNEL); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 296 | if (!*subvol_name) |
| 297 | return -ENOMEM; |
| 298 | } |
| 299 | return error; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 300 | } |
| 301 | |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 302 | static int btrfs_fill_super(struct super_block * sb, |
| 303 | struct btrfs_fs_devices *fs_devices, |
| 304 | void * data, int silent) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 305 | { |
| 306 | struct inode * inode; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 307 | struct dentry * root_dentry; |
| 308 | struct btrfs_super_block *disk_super; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 309 | struct btrfs_root *tree_root; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 310 | struct btrfs_inode *bi; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 311 | int err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 312 | |
| 313 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 314 | sb->s_magic = BTRFS_SUPER_MAGIC; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 315 | sb->s_op = &btrfs_super_ops; |
Balaji Rao | be6e8dc | 2008-07-21 02:01:56 +0530 | [diff] [blame] | 316 | sb->s_export_op = &btrfs_export_ops; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 317 | sb->s_xattr = btrfs_xattr_handlers; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 318 | sb->s_time_gran = 1; |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 319 | sb->s_flags |= MS_POSIXACL; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 320 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 321 | tree_root = open_ctree(sb, fs_devices, (char *)data); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 322 | |
Yan | e58ca02 | 2008-04-01 11:21:34 -0400 | [diff] [blame] | 323 | if (IS_ERR(tree_root)) { |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 324 | printk("btrfs: open_ctree failed\n"); |
Yan | e58ca02 | 2008-04-01 11:21:34 -0400 | [diff] [blame] | 325 | return PTR_ERR(tree_root); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 326 | } |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 327 | sb->s_fs_info = tree_root; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 328 | disk_super = &tree_root->fs_info->super_copy; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 329 | inode = btrfs_iget_locked(sb, BTRFS_FIRST_FREE_OBJECTID, |
| 330 | tree_root->fs_info->fs_root); |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 331 | bi = BTRFS_I(inode); |
| 332 | bi->location.objectid = inode->i_ino; |
| 333 | bi->location.offset = 0; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 334 | bi->root = tree_root->fs_info->fs_root; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 335 | |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 336 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
| 337 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 338 | if (!inode) { |
| 339 | err = -ENOMEM; |
| 340 | goto fail_close; |
| 341 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 342 | if (inode->i_state & I_NEW) { |
| 343 | btrfs_read_locked_inode(inode); |
| 344 | unlock_new_inode(inode); |
| 345 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 346 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 347 | root_dentry = d_alloc_root(inode); |
| 348 | if (!root_dentry) { |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 349 | iput(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 350 | err = -ENOMEM; |
| 351 | goto fail_close; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 352 | } |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame^] | 353 | #if 0 |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 354 | /* this does the super kobj at the same time */ |
| 355 | err = btrfs_sysfs_add_super(tree_root->fs_info); |
| 356 | if (err) |
| 357 | goto fail_close; |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame^] | 358 | #endif |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 359 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 360 | sb->s_root = root_dentry; |
Chris Mason | 6885f30 | 2008-02-20 16:11:05 -0500 | [diff] [blame] | 361 | |
Chris Mason | 6885f30 | 2008-02-20 16:11:05 -0500 | [diff] [blame] | 362 | save_mount_options(sb, data); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 363 | return 0; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 364 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 365 | fail_close: |
| 366 | close_ctree(tree_root); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 367 | return err; |
| 368 | } |
| 369 | |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 370 | int btrfs_sync_fs(struct super_block *sb, int wait) |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 371 | { |
| 372 | struct btrfs_trans_handle *trans; |
| 373 | struct btrfs_root *root; |
| 374 | int ret; |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 375 | root = btrfs_sb(sb); |
Chris Mason | df2ce34 | 2007-03-23 11:00:45 -0400 | [diff] [blame] | 376 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 377 | if (sb->s_flags & MS_RDONLY) |
| 378 | return 0; |
| 379 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 380 | sb->s_dirt = 0; |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 381 | if (!wait) { |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 382 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 383 | return 0; |
| 384 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 385 | |
| 386 | btrfs_start_delalloc_inodes(root); |
| 387 | btrfs_wait_ordered_extents(root, 0); |
| 388 | |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 389 | btrfs_clean_old_snapshots(root); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 390 | trans = btrfs_start_transaction(root, 1); |
| 391 | ret = btrfs_commit_transaction(trans, root); |
| 392 | sb->s_dirt = 0; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 393 | return ret; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 394 | } |
| 395 | |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 396 | static void btrfs_write_super(struct super_block *sb) |
| 397 | { |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 398 | sb->s_dirt = 0; |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 399 | } |
| 400 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 401 | static int btrfs_test_super(struct super_block *s, void *data) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 402 | { |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 403 | struct btrfs_fs_devices *test_fs_devices = data; |
| 404 | struct btrfs_root *root = btrfs_sb(s); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 405 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 406 | return root->fs_info->fs_devices == test_fs_devices; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 407 | } |
| 408 | |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 409 | /* |
| 410 | * Find a superblock for the given device / mount point. |
| 411 | * |
| 412 | * Note: This is based on get_sb_bdev from fs/super.c with a few additions |
| 413 | * for multiple device setup. Make sure to keep it in sync. |
| 414 | */ |
| 415 | static int btrfs_get_sb(struct file_system_type *fs_type, int flags, |
| 416 | const char *dev_name, void *data, struct vfsmount *mnt) |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 417 | { |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 418 | char *subvol_name = NULL; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 419 | struct block_device *bdev = NULL; |
| 420 | struct super_block *s; |
| 421 | struct dentry *root; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 422 | struct btrfs_fs_devices *fs_devices = NULL; |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 423 | fmode_t mode = FMODE_READ; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 424 | int error = 0; |
| 425 | |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 426 | if (!(flags & MS_RDONLY)) |
| 427 | mode |= FMODE_WRITE; |
| 428 | |
| 429 | error = btrfs_parse_early_options(data, mode, fs_type, |
Christoph Hellwig | 43e570b | 2008-06-10 10:40:46 -0400 | [diff] [blame] | 430 | &subvol_name, &fs_devices); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 431 | if (error) |
| 432 | goto error; |
| 433 | |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 434 | error = btrfs_scan_one_device(dev_name, mode, fs_type, &fs_devices); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 435 | if (error) |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 436 | goto error_free_subvol_name; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 437 | |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 438 | error = btrfs_open_devices(fs_devices, mode, fs_type); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 439 | if (error) |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 440 | goto error_free_subvol_name; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 441 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 442 | if (!(flags & MS_RDONLY) && fs_devices->rw_devices == 0) { |
| 443 | error = -EACCES; |
| 444 | goto error_close_devices; |
| 445 | } |
| 446 | |
Chris Mason | dfe2502 | 2008-05-13 13:46:40 -0400 | [diff] [blame] | 447 | bdev = fs_devices->latest_bdev; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 448 | s = sget(fs_type, btrfs_test_super, set_anon_super, fs_devices); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 449 | if (IS_ERR(s)) |
| 450 | goto error_s; |
| 451 | |
| 452 | if (s->s_root) { |
| 453 | if ((flags ^ s->s_flags) & MS_RDONLY) { |
| 454 | up_write(&s->s_umount); |
| 455 | deactivate_super(s); |
| 456 | error = -EBUSY; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 457 | goto error_close_devices; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 458 | } |
| 459 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 460 | btrfs_close_devices(fs_devices); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 461 | } else { |
| 462 | char b[BDEVNAME_SIZE]; |
| 463 | |
| 464 | s->s_flags = flags; |
| 465 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 466 | error = btrfs_fill_super(s, fs_devices, data, |
| 467 | flags & MS_SILENT ? 1 : 0); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 468 | if (error) { |
| 469 | up_write(&s->s_umount); |
| 470 | deactivate_super(s); |
| 471 | goto error; |
| 472 | } |
| 473 | |
Chris Mason | 788f20e | 2008-04-28 15:29:42 -0400 | [diff] [blame] | 474 | btrfs_sb(s)->fs_info->bdev_holder = fs_type; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 475 | s->s_flags |= MS_ACTIVE; |
| 476 | } |
| 477 | |
David Woodhouse | 76fcef1 | 2008-08-19 16:49:35 +0100 | [diff] [blame] | 478 | if (!strcmp(subvol_name, ".")) |
| 479 | root = dget(s->s_root); |
| 480 | else { |
| 481 | mutex_lock(&s->s_root->d_inode->i_mutex); |
| 482 | root = lookup_one_len(subvol_name, s->s_root, strlen(subvol_name)); |
| 483 | mutex_unlock(&s->s_root->d_inode->i_mutex); |
| 484 | if (IS_ERR(root)) { |
| 485 | up_write(&s->s_umount); |
| 486 | deactivate_super(s); |
| 487 | error = PTR_ERR(root); |
| 488 | goto error; |
| 489 | } |
| 490 | if (!root->d_inode) { |
| 491 | dput(root); |
| 492 | up_write(&s->s_umount); |
| 493 | deactivate_super(s); |
| 494 | error = -ENXIO; |
| 495 | goto error; |
| 496 | } |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 497 | } |
| 498 | |
| 499 | mnt->mnt_sb = s; |
| 500 | mnt->mnt_root = root; |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 501 | |
| 502 | kfree(subvol_name); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 503 | return 0; |
| 504 | |
| 505 | error_s: |
| 506 | error = PTR_ERR(s); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 507 | error_close_devices: |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 508 | btrfs_close_devices(fs_devices); |
Christoph Hellwig | edf24ab | 2008-06-10 10:40:29 -0400 | [diff] [blame] | 509 | error_free_subvol_name: |
| 510 | kfree(subvol_name); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 511 | error: |
| 512 | return error; |
| 513 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 514 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 515 | static int btrfs_remount(struct super_block *sb, int *flags, char *data) |
| 516 | { |
| 517 | struct btrfs_root *root = btrfs_sb(sb); |
| 518 | int ret; |
| 519 | |
| 520 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 521 | return 0; |
| 522 | |
| 523 | if (*flags & MS_RDONLY) { |
| 524 | sb->s_flags |= MS_RDONLY; |
| 525 | |
| 526 | ret = btrfs_commit_super(root); |
| 527 | WARN_ON(ret); |
| 528 | } else { |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 529 | if (root->fs_info->fs_devices->rw_devices == 0) |
| 530 | return -EACCES; |
| 531 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 532 | if (btrfs_super_log_root(&root->fs_info->super_copy) != 0) |
| 533 | return -EINVAL; |
| 534 | |
| 535 | ret = btrfs_cleanup_reloc_trees(root); |
| 536 | WARN_ON(ret); |
| 537 | |
| 538 | ret = btrfs_cleanup_fs_roots(root->fs_info); |
| 539 | WARN_ON(ret); |
| 540 | |
| 541 | sb->s_flags &= ~MS_RDONLY; |
| 542 | } |
| 543 | |
| 544 | return 0; |
| 545 | } |
| 546 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 547 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 548 | { |
| 549 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); |
Chris Mason | 4b52dff | 2007-06-26 10:06:50 -0400 | [diff] [blame] | 550 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 551 | int bits = dentry->d_sb->s_blocksize_bits; |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 552 | __be32 *fsid = (__be32 *)root->fs_info->fsid; |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 553 | |
| 554 | buf->f_namelen = BTRFS_NAME_LEN; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 555 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
| 556 | buf->f_bfree = buf->f_blocks - |
| 557 | (btrfs_super_bytes_used(disk_super) >> bits); |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 558 | buf->f_bavail = buf->f_bfree; |
| 559 | buf->f_bsize = dentry->d_sb->s_blocksize; |
| 560 | buf->f_type = BTRFS_SUPER_MAGIC; |
David Woodhouse | 9d03632 | 2008-08-18 12:01:52 +0100 | [diff] [blame] | 561 | /* We treat it as constant endianness (it doesn't matter _which_) |
| 562 | because we want the fsid to come out the same whether mounted |
| 563 | on a big-endian or little-endian host */ |
| 564 | buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]); |
| 565 | 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] | 566 | /* Mask in the root object ID too, to disambiguate subvols */ |
| 567 | buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32; |
| 568 | buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid; |
| 569 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 570 | return 0; |
| 571 | } |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 572 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 573 | static struct file_system_type btrfs_fs_type = { |
| 574 | .owner = THIS_MODULE, |
| 575 | .name = "btrfs", |
| 576 | .get_sb = btrfs_get_sb, |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 577 | .kill_sb = kill_anon_super, |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 578 | .fs_flags = FS_REQUIRES_DEV, |
| 579 | }; |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 580 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 581 | /* |
| 582 | * used by btrfsctl to scan devices when no FS is mounted |
| 583 | */ |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 584 | static long btrfs_control_ioctl(struct file *file, unsigned int cmd, |
| 585 | unsigned long arg) |
| 586 | { |
| 587 | struct btrfs_ioctl_vol_args *vol; |
| 588 | struct btrfs_fs_devices *fs_devices; |
Linda Knippers | f819d83 | 2008-06-09 22:17:11 -0400 | [diff] [blame] | 589 | int ret = 0; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 590 | int len; |
| 591 | |
| 592 | vol = kmalloc(sizeof(*vol), GFP_KERNEL); |
| 593 | if (copy_from_user(vol, (void __user *)arg, sizeof(*vol))) { |
| 594 | ret = -EFAULT; |
| 595 | goto out; |
| 596 | } |
| 597 | len = strnlen(vol->name, BTRFS_PATH_NAME_MAX); |
| 598 | switch (cmd) { |
| 599 | case BTRFS_IOC_SCAN_DEV: |
Christoph Hellwig | 97288f2 | 2008-12-02 06:36:09 -0500 | [diff] [blame] | 600 | ret = btrfs_scan_one_device(vol->name, FMODE_READ, |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 601 | &btrfs_fs_type, &fs_devices); |
| 602 | break; |
| 603 | } |
| 604 | out: |
| 605 | kfree(vol); |
Linda Knippers | f819d83 | 2008-06-09 22:17:11 -0400 | [diff] [blame] | 606 | return ret; |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 607 | } |
| 608 | |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 609 | static void btrfs_write_super_lockfs(struct super_block *sb) |
| 610 | { |
| 611 | struct btrfs_root *root = btrfs_sb(sb); |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 612 | mutex_lock(&root->fs_info->transaction_kthread_mutex); |
| 613 | mutex_lock(&root->fs_info->cleaner_mutex); |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 614 | } |
| 615 | |
| 616 | static void btrfs_unlockfs(struct super_block *sb) |
| 617 | { |
| 618 | struct btrfs_root *root = btrfs_sb(sb); |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 619 | mutex_unlock(&root->fs_info->cleaner_mutex); |
| 620 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 621 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 622 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 623 | static struct super_operations btrfs_super_ops = { |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 624 | .delete_inode = btrfs_delete_inode, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 625 | .put_super = btrfs_put_super, |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 626 | .write_super = btrfs_write_super, |
| 627 | .sync_fs = btrfs_sync_fs, |
Chris Mason | 6885f30 | 2008-02-20 16:11:05 -0500 | [diff] [blame] | 628 | .show_options = generic_show_options, |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 629 | .write_inode = btrfs_write_inode, |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 630 | .dirty_inode = btrfs_dirty_inode, |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 631 | .alloc_inode = btrfs_alloc_inode, |
| 632 | .destroy_inode = btrfs_destroy_inode, |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 633 | .statfs = btrfs_statfs, |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 634 | .remount_fs = btrfs_remount, |
Yan | ed0dab6 | 2008-01-22 12:46:56 -0500 | [diff] [blame] | 635 | .write_super_lockfs = btrfs_write_super_lockfs, |
| 636 | .unlockfs = btrfs_unlockfs, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 637 | }; |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 638 | |
| 639 | static const struct file_operations btrfs_ctl_fops = { |
| 640 | .unlocked_ioctl = btrfs_control_ioctl, |
| 641 | .compat_ioctl = btrfs_control_ioctl, |
| 642 | .owner = THIS_MODULE, |
| 643 | }; |
| 644 | |
| 645 | static struct miscdevice btrfs_misc = { |
| 646 | .minor = MISC_DYNAMIC_MINOR, |
| 647 | .name = "btrfs-control", |
| 648 | .fops = &btrfs_ctl_fops |
| 649 | }; |
| 650 | |
| 651 | static int btrfs_interface_init(void) |
| 652 | { |
| 653 | return misc_register(&btrfs_misc); |
| 654 | } |
| 655 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 656 | static void btrfs_interface_exit(void) |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 657 | { |
| 658 | if (misc_deregister(&btrfs_misc) < 0) |
| 659 | printk("misc_deregister failed for control device"); |
| 660 | } |
| 661 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 662 | static int __init init_btrfs_fs(void) |
| 663 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 664 | int err; |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 665 | |
| 666 | err = btrfs_init_sysfs(); |
| 667 | if (err) |
| 668 | return err; |
| 669 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 670 | err = btrfs_init_cachep(); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 671 | if (err) |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 672 | goto free_sysfs; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 673 | |
| 674 | err = extent_io_init(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 675 | if (err) |
| 676 | goto free_cachep; |
| 677 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 678 | err = extent_map_init(); |
| 679 | if (err) |
| 680 | goto free_extent_io; |
| 681 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 682 | err = btrfs_interface_init(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 683 | if (err) |
| 684 | goto free_extent_map; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 685 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 686 | err = register_filesystem(&btrfs_fs_type); |
| 687 | if (err) |
| 688 | goto unregister_ioctl; |
Chris Mason | b3c3da7 | 2008-07-23 12:12:13 -0400 | [diff] [blame] | 689 | |
| 690 | printk(KERN_INFO "%s loaded\n", BTRFS_BUILD_VERSION); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 691 | return 0; |
| 692 | |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 693 | unregister_ioctl: |
| 694 | btrfs_interface_exit(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 695 | free_extent_map: |
| 696 | extent_map_exit(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 697 | free_extent_io: |
| 698 | extent_io_exit(); |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 699 | free_cachep: |
| 700 | btrfs_destroy_cachep(); |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 701 | free_sysfs: |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 702 | btrfs_exit_sysfs(); |
| 703 | return err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 704 | } |
| 705 | |
| 706 | static void __exit exit_btrfs_fs(void) |
| 707 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 708 | btrfs_destroy_cachep(); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 709 | extent_map_exit(); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 710 | extent_io_exit(); |
Chris Mason | a9218f6 | 2008-03-24 15:02:04 -0400 | [diff] [blame] | 711 | btrfs_interface_exit(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 712 | unregister_filesystem(&btrfs_fs_type); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 713 | btrfs_exit_sysfs(); |
Chris Mason | 8a4b83c | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 714 | btrfs_cleanup_fs_uuids(); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 715 | btrfs_zlib_exit(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 716 | } |
| 717 | |
| 718 | module_init(init_btrfs_fs) |
| 719 | module_exit(exit_btrfs_fs) |
| 720 | |
| 721 | MODULE_LICENSE("GPL"); |