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)