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 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 19 | #include <linux/module.h> |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 20 | #include <linux/buffer_head.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 21 | #include <linux/fs.h> |
| 22 | #include <linux/pagemap.h> |
| 23 | #include <linux/highmem.h> |
| 24 | #include <linux/time.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/string.h> |
| 27 | #include <linux/smp_lock.h> |
| 28 | #include <linux/backing-dev.h> |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 29 | #include <linux/mpage.h> |
Chris Mason | 75dfe39 | 2007-03-29 11:56:46 -0400 | [diff] [blame] | 30 | #include <linux/swap.h> |
| 31 | #include <linux/writeback.h> |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 32 | #include <linux/statfs.h> |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 33 | #include <linux/compat.h> |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 34 | #include "ctree.h" |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 35 | #include "disk-io.h" |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 36 | #include "transaction.h" |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 37 | #include "btrfs_inode.h" |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 38 | #include "ioctl.h" |
Chris Mason | 3a68637 | 2007-05-24 13:35:57 -0400 | [diff] [blame] | 39 | #include "print-tree.h" |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 40 | |
| 41 | #define BTRFS_SUPER_MAGIC 0x9123682E |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 42 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 43 | static struct super_operations btrfs_super_ops; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 44 | |
| 45 | static void btrfs_put_super (struct super_block * sb) |
| 46 | { |
| 47 | struct btrfs_root *root = btrfs_sb(sb); |
| 48 | int ret; |
| 49 | |
| 50 | ret = close_ctree(root); |
| 51 | if (ret) { |
| 52 | printk("close ctree returns %d\n", ret); |
| 53 | } |
| 54 | sb->s_fs_info = NULL; |
| 55 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 56 | |
| 57 | static int btrfs_fill_super(struct super_block * sb, void * data, int silent) |
| 58 | { |
| 59 | struct inode * inode; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 60 | struct dentry * root_dentry; |
| 61 | struct btrfs_super_block *disk_super; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 62 | struct btrfs_root *tree_root; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 63 | struct btrfs_inode *bi; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 64 | int err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 65 | |
| 66 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 67 | sb->s_magic = BTRFS_SUPER_MAGIC; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 68 | sb->s_op = &btrfs_super_ops; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 69 | sb->s_time_gran = 1; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 70 | |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 71 | tree_root = open_ctree(sb); |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 72 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 73 | if (!tree_root || IS_ERR(tree_root)) { |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 74 | printk("btrfs: open_ctree failed\n"); |
| 75 | return -EIO; |
| 76 | } |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 77 | sb->s_fs_info = tree_root; |
| 78 | disk_super = tree_root->fs_info->disk_super; |
Chris Mason | c5739bb | 2007-04-10 09:27:04 -0400 | [diff] [blame] | 79 | inode = btrfs_iget_locked(sb, btrfs_super_root_dir(disk_super), |
| 80 | tree_root); |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 81 | bi = BTRFS_I(inode); |
| 82 | bi->location.objectid = inode->i_ino; |
| 83 | bi->location.offset = 0; |
| 84 | bi->location.flags = 0; |
Chris Mason | 0f7d52f | 2007-04-09 10:42:37 -0400 | [diff] [blame] | 85 | bi->root = tree_root; |
Chris Mason | d6e4a42 | 2007-04-06 15:37:36 -0400 | [diff] [blame] | 86 | btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY); |
| 87 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 88 | if (!inode) { |
| 89 | err = -ENOMEM; |
| 90 | goto fail_close; |
| 91 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 92 | if (inode->i_state & I_NEW) { |
| 93 | btrfs_read_locked_inode(inode); |
| 94 | unlock_new_inode(inode); |
| 95 | } |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 96 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 97 | root_dentry = d_alloc_root(inode); |
| 98 | if (!root_dentry) { |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 99 | iput(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 100 | err = -ENOMEM; |
| 101 | goto fail_close; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 102 | } |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 103 | sb->s_root = root_dentry; |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 104 | btrfs_transaction_queue_work(tree_root, HZ * 30); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 105 | return 0; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 106 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 107 | fail_close: |
| 108 | close_ctree(tree_root); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 109 | return err; |
| 110 | } |
| 111 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 112 | static int btrfs_sync_fs(struct super_block *sb, int wait) |
| 113 | { |
| 114 | struct btrfs_trans_handle *trans; |
| 115 | struct btrfs_root *root; |
| 116 | int ret; |
Chris Mason | d98237b | 2007-03-28 13:57:48 -0400 | [diff] [blame] | 117 | root = btrfs_sb(sb); |
Chris Mason | df2ce34 | 2007-03-23 11:00:45 -0400 | [diff] [blame] | 118 | |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 119 | sb->s_dirt = 0; |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 120 | if (!wait) { |
Chris Mason | 7cfcc17 | 2007-04-02 14:53:59 -0400 | [diff] [blame] | 121 | filemap_flush(root->fs_info->btree_inode->i_mapping); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 122 | return 0; |
| 123 | } |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 124 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 125 | trans = btrfs_start_transaction(root, 1); |
| 126 | ret = btrfs_commit_transaction(trans, root); |
| 127 | sb->s_dirt = 0; |
| 128 | BUG_ON(ret); |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 129 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 130 | return 0; |
| 131 | } |
| 132 | |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 133 | static void btrfs_write_super(struct super_block *sb) |
| 134 | { |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 135 | sb->s_dirt = 0; |
Chris Mason | d561c02 | 2007-03-23 19:47:49 -0400 | [diff] [blame] | 136 | } |
| 137 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 138 | static int btrfs_get_sb(struct file_system_type *fs_type, |
| 139 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
| 140 | { |
| 141 | return get_sb_bdev(fs_type, flags, dev_name, data, |
| 142 | btrfs_fill_super, mnt); |
| 143 | } |
| 144 | |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 145 | static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 146 | { |
| 147 | struct btrfs_root *root = btrfs_sb(dentry->d_sb); |
| 148 | struct btrfs_super_block *disk_super = root->fs_info->disk_super; |
| 149 | |
| 150 | buf->f_namelen = BTRFS_NAME_LEN; |
| 151 | buf->f_blocks = btrfs_super_total_blocks(disk_super); |
| 152 | buf->f_bfree = buf->f_blocks - btrfs_super_blocks_used(disk_super); |
| 153 | buf->f_bavail = buf->f_bfree; |
| 154 | buf->f_bsize = dentry->d_sb->s_blocksize; |
| 155 | buf->f_type = BTRFS_SUPER_MAGIC; |
| 156 | return 0; |
| 157 | } |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 158 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 159 | static struct file_system_type btrfs_fs_type = { |
| 160 | .owner = THIS_MODULE, |
| 161 | .name = "btrfs", |
| 162 | .get_sb = btrfs_get_sb, |
| 163 | .kill_sb = kill_block_super, |
| 164 | .fs_flags = FS_REQUIRES_DEV, |
| 165 | }; |
| 166 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 167 | static struct super_operations btrfs_super_ops = { |
Chris Mason | 134e973 | 2007-03-25 13:44:56 -0400 | [diff] [blame] | 168 | .delete_inode = btrfs_delete_inode, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 169 | .put_super = btrfs_put_super, |
| 170 | .read_inode = btrfs_read_locked_inode, |
Chris Mason | d571976 | 2007-03-23 10:01:08 -0400 | [diff] [blame] | 171 | .write_super = btrfs_write_super, |
| 172 | .sync_fs = btrfs_sync_fs, |
Chris Mason | 4730a4b | 2007-03-26 12:00:39 -0400 | [diff] [blame] | 173 | .write_inode = btrfs_write_inode, |
Chris Mason | b513386 | 2007-04-24 11:52:22 -0400 | [diff] [blame] | 174 | .dirty_inode = btrfs_dirty_inode, |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 175 | .alloc_inode = btrfs_alloc_inode, |
| 176 | .destroy_inode = btrfs_destroy_inode, |
Chris Mason | 8fd1779 | 2007-04-19 21:01:03 -0400 | [diff] [blame] | 177 | .statfs = btrfs_statfs, |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 178 | }; |
| 179 | |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 180 | static int __init init_btrfs_fs(void) |
| 181 | { |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 182 | int err; |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 183 | btrfs_init_transaction_sys(); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 184 | err = btrfs_init_cachep(); |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 185 | if (err) |
| 186 | return err; |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 187 | return register_filesystem(&btrfs_fs_type); |
| 188 | } |
| 189 | |
| 190 | static void __exit exit_btrfs_fs(void) |
| 191 | { |
Chris Mason | 08607c1 | 2007-06-08 15:33:54 -0400 | [diff] [blame] | 192 | btrfs_exit_transaction_sys(); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 193 | btrfs_destroy_cachep(); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 194 | unregister_filesystem(&btrfs_fs_type); |
Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 195 | } |
| 196 | |
| 197 | module_init(init_btrfs_fs) |
| 198 | module_exit(exit_btrfs_fs) |
| 199 | |
| 200 | MODULE_LICENSE("GPL"); |