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 | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 39 | #include "ctree.h" |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 40 | #include "disk-io.h" |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 41 | #include "transaction.h" |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 42 | #include "btrfs_inode.h" |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 43 | #include "ioctl.h" |
Chris Mason | 3a68637 | 2007-05-24 13:35:57 -0400 | [diff] [blame] | 44 | #include "print-tree.h" |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 45 | #include "xattr.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 46 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 47 | #define BTRFS_SUPER_MAGIC 0x9123683E |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 48 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 49 | static struct super_operations btrfs_super_ops; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 50 | |
| 51 | static void btrfs_put_super (struct super_block * sb) |
| 52 | { |
| 53 | struct btrfs_root *root = btrfs_sb(sb); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 54 | struct btrfs_fs_info *fs = root->fs_info; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 55 | int ret; |
| 56 | |
| 57 | ret = close_ctree(root); |
| 58 | if (ret) { |
| 59 | printk("close ctree returns %d\n", ret); |
| 60 | } |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 61 | btrfs_sysfs_del_super(fs); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 62 | sb->s_fs_info = NULL; |
| 63 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 64 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 65 | enum { |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 66 | Opt_subvol, Opt_nodatasum, Opt_nodatacow, Opt_max_extent, Opt_err, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 67 | }; |
| 68 | |
| 69 | static match_table_t tokens = { |
| 70 | {Opt_subvol, "subvol=%s"}, |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 71 | {Opt_nodatasum, "nodatasum"}, |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 72 | {Opt_nodatacow, "nodatacow"}, |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 73 | {Opt_max_extent, "max_extent=%s"}, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 74 | {Opt_err, NULL} |
| 75 | }; |
| 76 | |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 77 | static unsigned long parse_size(char *str) |
| 78 | { |
| 79 | unsigned long res; |
| 80 | int mult = 1; |
| 81 | char *end; |
| 82 | char last; |
| 83 | |
| 84 | res = simple_strtoul(str, &end, 10); |
| 85 | |
| 86 | last = end[0]; |
| 87 | if (isalpha(last)) { |
| 88 | last = tolower(last); |
| 89 | switch (last) { |
| 90 | case 'g': |
| 91 | mult *= 1024; |
| 92 | case 'm': |
| 93 | mult *= 1024; |
| 94 | case 'k': |
| 95 | mult *= 1024; |
| 96 | } |
| 97 | res = res * mult; |
| 98 | } |
| 99 | return res; |
| 100 | } |
| 101 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 102 | static int parse_options (char * options, |
| 103 | struct btrfs_root *root, |
| 104 | char **subvol_name) |
| 105 | { |
| 106 | char * p; |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 107 | struct btrfs_fs_info *info = NULL; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 108 | substring_t args[MAX_OPT_ARGS]; |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 109 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 110 | if (!options) |
| 111 | return 1; |
| 112 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 113 | /* |
| 114 | * strsep changes the string, duplicate it because parse_options |
| 115 | * gets called twice |
| 116 | */ |
| 117 | options = kstrdup(options, GFP_NOFS); |
| 118 | if (!options) |
| 119 | return -ENOMEM; |
| 120 | |
| 121 | if (root) |
| 122 | info = root->fs_info; |
| 123 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 124 | while ((p = strsep (&options, ",")) != NULL) { |
| 125 | int token; |
| 126 | if (!*p) |
| 127 | continue; |
| 128 | |
| 129 | token = match_token(p, tokens, args); |
| 130 | switch (token) { |
| 131 | case Opt_subvol: |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 132 | if (subvol_name) { |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 133 | *subvol_name = match_strdup(&args[0]); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 134 | } |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 135 | break; |
| 136 | case Opt_nodatasum: |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 137 | if (info) { |
| 138 | printk("btrfs: setting nodatacsum\n"); |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 139 | btrfs_set_opt(info->mount_opt, NODATASUM); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 140 | } |
| 141 | break; |
| 142 | case Opt_nodatacow: |
| 143 | if (info) { |
| 144 | printk("btrfs: setting nodatacow\n"); |
| 145 | btrfs_set_opt(info->mount_opt, NODATACOW); |
| 146 | btrfs_set_opt(info->mount_opt, NODATASUM); |
| 147 | } |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 148 | break; |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 149 | case Opt_max_extent: |
| 150 | if (info) { |
| 151 | char *num = match_strdup(&args[0]); |
| 152 | if (num) { |
| 153 | info->max_extent = parse_size(num); |
| 154 | kfree(num); |
| 155 | |
| 156 | info->max_extent = max_t(u64, |
| 157 | info->max_extent, |
| 158 | root->sectorsize); |
| 159 | printk("btrfs: max_extent at %Lu\n", |
| 160 | info->max_extent); |
| 161 | } |
| 162 | } |
| 163 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 164 | default: |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 165 | break; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 166 | } |
| 167 | } |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 168 | kfree(options); |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 169 | return 1; |
| 170 | } |
| 171 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 172 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) |
| 173 | { |
| 174 | struct inode * inode; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 175 | struct dentry * root_dentry; |
| 176 | struct btrfs_super_block *disk_super; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 177 | struct btrfs_root *tree_root; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 178 | struct btrfs_inode *bi; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 179 | int err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 180 | |
| 181 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 182 | sb->s_magic = BTRFS_SUPER_MAGIC; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 183 | sb->s_op = &btrfs_super_ops; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 184 | sb->s_xattr = btrfs_xattr_handlers; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 185 | sb->s_time_gran = 1; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 186 | |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 187 | tree_root = open_ctree(sb); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 188 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 189 | if (!tree_root || IS_ERR(tree_root)) { |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 190 | printk("btrfs: open_ctree failed\n"); |
| 191 | return -EIO; |
| 192 | } |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 193 | sb->s_fs_info = tree_root; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 194 | disk_super = &tree_root->fs_info->super_copy; |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 195 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
| 196 | tree_root); |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 197 | bi = BTRFS_I(inode); |
| 198 | bi->location.objectid = inode->i_ino; |
| 199 | bi->location.offset = 0; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 200 | bi->root = tree_root; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 201 | |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 202 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
| 203 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 204 | if (!inode) { |
| 205 | err = -ENOMEM; |
| 206 | goto fail_close; |
| 207 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 208 | if (inode->i_state & I_NEW) { |
| 209 | btrfs_read_locked_inode(inode); |
| 210 | unlock_new_inode(inode); |
| 211 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 212 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 213 | root_dentry = d_alloc_root(inode); |
| 214 | if (!root_dentry) { |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 215 | iput(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 216 | err = -ENOMEM; |
| 217 | goto fail_close; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 218 | } |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 219 | |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 220 | parse_options((char *)data, tree_root, NULL); |
| 221 | |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 222 | /* this does the super kobj at the same time */ |
| 223 | err = btrfs_sysfs_add_super(tree_root->fs_info); |
| 224 | if (err) |
| 225 | goto fail_close; |
| 226 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 227 | sb->s_root = root_dentry; |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 228 | btrfs_transaction_queue_work(tree_root, HZ * 30); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 229 | return 0; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 230 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 231 | fail_close: |
| 232 | close_ctree(tree_root); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 233 | return err; |
| 234 | } |
| 235 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 236 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
| 237 | { |
| 238 | struct btrfs_trans_handle *trans; |
| 239 | struct btrfs_root *root; |
| 240 | int ret; |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 241 | root = btrfs_sb(sb); |
Chris Mason | df2ce34 | 2007-03-23 11:00:45 -0400 | [diff] [blame] | 242 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 243 | sb->s_dirt = 0; |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 244 | if (!wait) { |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 245 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 246 | return 0; |
| 247 | } |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 248 | btrfs_clean_old_snapshots(root); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 249 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 250 | btrfs_defrag_dirty_roots(root->fs_info); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 251 | trans = btrfs_start_transaction(root, 1); |
| 252 | ret = btrfs_commit_transaction(trans, root); |
| 253 | sb->s_dirt = 0; |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 254 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 255 | return ret; |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 256 | } |
| 257 | |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 258 | static void btrfs_write_super(struct super_block *sb) |
| 259 | { |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 260 | sb->s_dirt = 0; |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 261 | } |
| 262 | |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 263 | /* |
| 264 | * This is almost a copy of get_sb_bdev in fs/super.c. |
| 265 | * We need the local copy to allow direct mounting of |
| 266 | * subvolumes, but this could be easily integrated back |
| 267 | * into the generic version. --hch |
| 268 | */ |
| 269 | |
| 270 | /* start copy & paste */ |
| 271 | static int set_bdev_super(struct super_block *s, void *data) |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 272 | { |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 273 | s->s_bdev = data; |
| 274 | s->s_dev = s->s_bdev->bd_dev; |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | static int test_bdev_super(struct super_block *s, void *data) |
| 279 | { |
| 280 | return (void *)s->s_bdev == data; |
| 281 | } |
| 282 | |
| 283 | int btrfs_get_sb_bdev(struct file_system_type *fs_type, |
| 284 | int flags, const char *dev_name, void *data, |
| 285 | int (*fill_super)(struct super_block *, void *, int), |
| 286 | struct vfsmount *mnt, const char *subvol) |
| 287 | { |
| 288 | struct block_device *bdev = NULL; |
| 289 | struct super_block *s; |
| 290 | struct dentry *root; |
| 291 | int error = 0; |
| 292 | |
| 293 | bdev = open_bdev_excl(dev_name, flags, fs_type); |
| 294 | if (IS_ERR(bdev)) |
| 295 | return PTR_ERR(bdev); |
| 296 | |
| 297 | /* |
| 298 | * once the super is inserted into the list by sget, s_umount |
| 299 | * will protect the lockfs code from trying to start a snapshot |
| 300 | * while we are mounting |
| 301 | */ |
| 302 | down(&bdev->bd_mount_sem); |
| 303 | s = sget(fs_type, test_bdev_super, set_bdev_super, bdev); |
| 304 | up(&bdev->bd_mount_sem); |
| 305 | if (IS_ERR(s)) |
| 306 | goto error_s; |
| 307 | |
| 308 | if (s->s_root) { |
| 309 | if ((flags ^ s->s_flags) & MS_RDONLY) { |
| 310 | up_write(&s->s_umount); |
| 311 | deactivate_super(s); |
| 312 | error = -EBUSY; |
| 313 | goto error_bdev; |
| 314 | } |
| 315 | |
| 316 | close_bdev_excl(bdev); |
| 317 | } else { |
| 318 | char b[BDEVNAME_SIZE]; |
| 319 | |
| 320 | s->s_flags = flags; |
| 321 | strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id)); |
| 322 | sb_set_blocksize(s, block_size(bdev)); |
| 323 | error = fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
| 324 | if (error) { |
| 325 | up_write(&s->s_umount); |
| 326 | deactivate_super(s); |
| 327 | goto error; |
| 328 | } |
| 329 | |
| 330 | s->s_flags |= MS_ACTIVE; |
| 331 | } |
| 332 | |
| 333 | if (subvol) { |
| 334 | root = lookup_one_len(subvol, s->s_root, strlen(subvol)); |
| 335 | if (IS_ERR(root)) { |
| 336 | up_write(&s->s_umount); |
| 337 | deactivate_super(s); |
| 338 | error = PTR_ERR(root); |
| 339 | goto error; |
| 340 | } |
| 341 | if (!root->d_inode) { |
| 342 | dput(root); |
| 343 | up_write(&s->s_umount); |
| 344 | deactivate_super(s); |
| 345 | error = -ENXIO; |
| 346 | goto error; |
| 347 | } |
| 348 | } else { |
| 349 | root = dget(s->s_root); |
| 350 | } |
| 351 | |
| 352 | mnt->mnt_sb = s; |
| 353 | mnt->mnt_root = root; |
| 354 | return 0; |
| 355 | |
| 356 | error_s: |
| 357 | error = PTR_ERR(s); |
| 358 | error_bdev: |
| 359 | close_bdev_excl(bdev); |
| 360 | error: |
| 361 | return error; |
| 362 | } |
| 363 | /* end copy & paste */ |
| 364 | |
| 365 | static int btrfs_get_sb(struct file_system_type *fs_type, |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 366 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 367 | { |
| 368 | int ret; |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 369 | char *subvol_name = NULL; |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 370 | |
Chris Mason | 95e0528 | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 371 | parse_options((char *)data, NULL, &subvol_name); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 372 | ret = btrfs_get_sb_bdev(fs_type, flags, dev_name, data, |
| 373 | btrfs_fill_super, mnt, |
| 374 | subvol_name ? subvol_name : "default"); |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 375 | if (subvol_name) |
| 376 | kfree(subvol_name); |
Yan | 4b82d6e | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 377 | return ret; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 378 | } |
| 379 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 380 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 381 | { |
| 382 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); |
Chris Mason | 4b52dff | 2007-06-26 10:06:50 -0400 | [diff] [blame] | 383 | struct btrfs_super_block *disk_super = &root->fs_info->super_copy; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 384 | int bits = dentry->d_sb->s_blocksize_bits; |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 385 | |
| 386 | buf->f_namelen = BTRFS_NAME_LEN; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 387 | buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits; |
| 388 | buf->f_bfree = buf->f_blocks - |
| 389 | (btrfs_super_bytes_used(disk_super) >> bits); |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 390 | buf->f_bavail = buf->f_bfree; |
| 391 | buf->f_bsize = dentry->d_sb->s_blocksize; |
| 392 | buf->f_type = BTRFS_SUPER_MAGIC; |
| 393 | return 0; |
| 394 | } |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 395 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 396 | static struct file_system_type btrfs_fs_type = { |
| 397 | .owner = THIS_MODULE, |
| 398 | .name = "btrfs", |
| 399 | .get_sb = btrfs_get_sb, |
| 400 | .kill_sb = kill_block_super, |
| 401 | .fs_flags = FS_REQUIRES_DEV, |
| 402 | }; |
| 403 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 404 | static struct super_operations btrfs_super_ops = { |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 405 | .delete_inode = btrfs_delete_inode, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 406 | .put_super = btrfs_put_super, |
| 407 | .read_inode = btrfs_read_locked_inode, |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 408 | .write_super = btrfs_write_super, |
| 409 | .sync_fs = btrfs_sync_fs, |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 410 | .write_inode = btrfs_write_inode, |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 411 | .dirty_inode = btrfs_dirty_inode, |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 412 | .alloc_inode = btrfs_alloc_inode, |
| 413 | .destroy_inode = btrfs_destroy_inode, |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 414 | .statfs = btrfs_statfs, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 415 | }; |
| 416 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 417 | static int __init init_btrfs_fs(void) |
| 418 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 419 | int err; |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 420 | |
| 421 | err = btrfs_init_sysfs(); |
| 422 | if (err) |
| 423 | return err; |
| 424 | |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 425 | btrfs_init_transaction_sys(); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 426 | err = btrfs_init_cachep(); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 427 | if (err) |
Wyatt Banks | 2f4cbe6 | 2007-11-19 10:22:33 -0500 | [diff] [blame] | 428 | goto free_transaction_sys; |
| 429 | err = extent_map_init(); |
| 430 | if (err) |
| 431 | goto free_cachep; |
| 432 | |
| 433 | err = register_filesystem(&btrfs_fs_type); |
| 434 | if (err) |
| 435 | goto free_extent_map; |
| 436 | return 0; |
| 437 | |
| 438 | free_extent_map: |
| 439 | extent_map_exit(); |
| 440 | free_cachep: |
| 441 | btrfs_destroy_cachep(); |
| 442 | free_transaction_sys: |
| 443 | btrfs_exit_transaction_sys(); |
| 444 | btrfs_exit_sysfs(); |
| 445 | return err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 446 | } |
| 447 | |
| 448 | static void __exit exit_btrfs_fs(void) |
| 449 | { |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 450 | btrfs_exit_transaction_sys(); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 451 | btrfs_destroy_cachep(); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 452 | extent_map_exit(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 453 | unregister_filesystem(&btrfs_fs_type); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 454 | btrfs_exit_sysfs(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 455 | } |
| 456 | |
| 457 | module_init(init_btrfs_fs) |
| 458 | module_exit(exit_btrfs_fs) |
| 459 | |
| 460 | MODULE_LICENSE("GPL"); |