1 #include <linux/module.h>
5 #include "transaction.h"
7 static int check_tree_block(struct btrfs_root
*root
, struct buffer_head
*buf
)
9 struct btrfs_node
*node
= btrfs_buffer_node(buf
);
10 if (buf
->b_blocknr
!= btrfs_header_blocknr(&node
->header
))
12 if (root
->node
&& btrfs_header_parentid(&node
->header
) !=
13 btrfs_header_parentid(btrfs_buffer_header(root
->node
)))
18 struct buffer_head
*alloc_tree_block(struct btrfs_root
*root
, u64 blocknr
)
20 return sb_getblk(root
->fs_info
->sb
, blocknr
);
23 struct buffer_head
*find_tree_block(struct btrfs_root
*root
, u64 blocknr
)
25 return sb_getblk(root
->fs_info
->sb
, blocknr
);
28 struct buffer_head
*read_tree_block(struct btrfs_root
*root
, u64 blocknr
)
30 struct buffer_head
*buf
= sb_bread(root
->fs_info
->sb
, blocknr
);
34 if (check_tree_block(root
, buf
))
39 int dirty_tree_block(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
40 struct buffer_head
*buf
)
42 mark_buffer_dirty(buf
);
46 int clean_tree_block(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
47 struct buffer_head
*buf
)
49 clear_buffer_dirty(buf
);
53 static int __setup_root(struct btrfs_super_block
*super
,
54 struct btrfs_root
*root
,
55 struct btrfs_fs_info
*fs_info
,
59 root
->commit_root
= NULL
;
60 root
->blocksize
= btrfs_super_blocksize(super
);
62 root
->fs_info
= fs_info
;
63 memset(&root
->root_key
, 0, sizeof(root
->root_key
));
64 memset(&root
->root_item
, 0, sizeof(root
->root_item
));
68 static int find_and_setup_root(struct btrfs_super_block
*super
,
69 struct btrfs_root
*tree_root
,
70 struct btrfs_fs_info
*fs_info
,
72 struct btrfs_root
*root
)
76 __setup_root(super
, root
, fs_info
, objectid
);
77 ret
= btrfs_find_last_root(tree_root
, objectid
,
78 &root
->root_item
, &root
->root_key
);
81 root
->node
= read_tree_block(root
,
82 btrfs_root_blocknr(&root
->root_item
));
87 struct btrfs_root
*open_ctree(struct super_block
*sb
,
88 struct buffer_head
*sb_buffer
,
89 struct btrfs_super_block
*disk_super
)
91 struct btrfs_root
*root
= kmalloc(sizeof(struct btrfs_root
),
93 struct btrfs_root
*extent_root
= kmalloc(sizeof(struct btrfs_root
),
95 struct btrfs_root
*tree_root
= kmalloc(sizeof(struct btrfs_root
),
97 struct btrfs_root
*inode_root
= kmalloc(sizeof(struct btrfs_root
),
99 struct btrfs_fs_info
*fs_info
= kmalloc(sizeof(*fs_info
),
103 /* FIXME: don't be stupid */
104 if (!btrfs_super_root(disk_super
))
106 INIT_RADIX_TREE(&fs_info
->pinned_radix
, GFP_KERNEL
);
107 fs_info
->running_transaction
= NULL
;
108 fs_info
->fs_root
= root
;
109 fs_info
->tree_root
= tree_root
;
110 fs_info
->extent_root
= extent_root
;
111 fs_info
->inode_root
= inode_root
;
112 fs_info
->last_inode_alloc
= 0;
113 fs_info
->last_inode_alloc_dirid
= 0;
114 fs_info
->disk_super
= disk_super
;
115 fs_info
->sb_buffer
= sb_buffer
;
117 mutex_init(&fs_info
->trans_mutex
);
118 memset(&fs_info
->current_insert
, 0, sizeof(fs_info
->current_insert
));
119 memset(&fs_info
->last_insert
, 0, sizeof(fs_info
->last_insert
));
121 __setup_root(disk_super
, tree_root
, fs_info
, BTRFS_ROOT_TREE_OBJECTID
);
122 tree_root
->node
= read_tree_block(tree_root
,
123 btrfs_super_root(disk_super
));
124 BUG_ON(!tree_root
->node
);
126 ret
= find_and_setup_root(disk_super
, tree_root
, fs_info
,
127 BTRFS_EXTENT_TREE_OBJECTID
, extent_root
);
130 ret
= find_and_setup_root(disk_super
, tree_root
, fs_info
,
131 BTRFS_INODE_MAP_OBJECTID
, inode_root
);
134 ret
= find_and_setup_root(disk_super
, tree_root
, fs_info
,
135 BTRFS_FS_TREE_OBJECTID
, root
);
138 root
->commit_root
= root
->node
;
141 root
->fs_info
->generation
= root
->root_key
.offset
+ 1;
145 int write_ctree_super(struct btrfs_trans_handle
*trans
, struct btrfs_root
151 btrfs_set_super_root(s
, root
->fs_info
->tree_root
->node
->b_blocknr
);
153 ret
= pwrite(root
->fs_info
->fp
, s
, sizeof(*s
),
154 BTRFS_SUPER_INFO_OFFSET
);
155 if (ret
!= sizeof(*s
)) {
156 fprintf(stderr
, "failed to write new super block err %d\n", ret
);
163 int close_ctree(struct btrfs_root
*root
)
166 struct btrfs_trans_handle
*trans
;
168 trans
= btrfs_start_transaction(root
, 1);
169 btrfs_commit_transaction(trans
, root
);
170 /* run commit again to drop the original snapshot */
171 trans
= btrfs_start_transaction(root
, 1);
172 btrfs_commit_transaction(trans
, root
);
173 ret
= btrfs_write_and_wait_transaction(NULL
, root
);
175 write_ctree_super(NULL
, root
);
178 btrfs_block_release(root
, root
->node
);
179 if (root
->fs_info
->extent_root
->node
)
180 btrfs_block_release(root
->fs_info
->extent_root
,
181 root
->fs_info
->extent_root
->node
);
182 if (root
->fs_info
->inode_root
->node
)
183 btrfs_block_release(root
->fs_info
->inode_root
,
184 root
->fs_info
->inode_root
->node
);
185 if (root
->fs_info
->tree_root
->node
)
186 btrfs_block_release(root
->fs_info
->tree_root
,
187 root
->fs_info
->tree_root
->node
);
188 btrfs_block_release(root
, root
->commit_root
);
189 btrfs_block_release(root
, root
->fs_info
->sb_buffer
);
190 kfree(root
->fs_info
->extent_root
);
191 kfree(root
->fs_info
->inode_root
);
192 kfree(root
->fs_info
->tree_root
);
193 kfree(root
->fs_info
);
198 void btrfs_block_release(struct btrfs_root
*root
, struct buffer_head
*buf
)