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))) {
19 struct buffer_head *alloc_tree_block(struct btrfs_root *root, u64 blocknr)
21 return sb_getblk(root->fs_info->sb, blocknr);
24 struct buffer_head *find_tree_block(struct btrfs_root *root, u64 blocknr)
26 return sb_getblk(root->fs_info->sb, blocknr);
29 struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr)
31 struct buffer_head *buf = sb_bread(root->fs_info->sb, blocknr);
35 if (check_tree_block(root, buf))
40 int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
41 struct buffer_head *buf)
43 mark_buffer_dirty(buf);
47 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
48 struct buffer_head *buf)
50 clear_buffer_dirty(buf);
54 static int __setup_root(struct btrfs_super_block *super,
55 struct btrfs_root *root,
56 struct btrfs_fs_info *fs_info,
60 root->commit_root = NULL;
61 root->blocksize = btrfs_super_blocksize(super);
63 root->fs_info = fs_info;
64 memset(&root->root_key, 0, sizeof(root->root_key));
65 memset(&root->root_item, 0, sizeof(root->root_item));
69 static int find_and_setup_root(struct btrfs_super_block *super,
70 struct btrfs_root *tree_root,
71 struct btrfs_fs_info *fs_info,
73 struct btrfs_root *root)
77 __setup_root(super, root, fs_info, objectid);
78 ret = btrfs_find_last_root(tree_root, objectid,
79 &root->root_item, &root->root_key);
82 root->node = read_tree_block(root,
83 btrfs_root_blocknr(&root->root_item));
88 struct btrfs_root *open_ctree(struct super_block *sb,
89 struct buffer_head *sb_buffer,
90 struct btrfs_super_block *disk_super)
92 struct btrfs_root *root = kmalloc(sizeof(struct btrfs_root),
94 struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
96 struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
98 struct btrfs_root *inode_root = kmalloc(sizeof(struct btrfs_root),
100 struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
104 /* FIXME: don't be stupid */
105 if (!btrfs_super_root(disk_super))
107 INIT_RADIX_TREE(&fs_info->pinned_radix, GFP_KERNEL);
108 fs_info->running_transaction = NULL;
109 fs_info->fs_root = root;
110 fs_info->tree_root = tree_root;
111 fs_info->extent_root = extent_root;
112 fs_info->inode_root = inode_root;
113 fs_info->last_inode_alloc = 0;
114 fs_info->last_inode_alloc_dirid = 0;
115 fs_info->disk_super = disk_super;
116 fs_info->sb_buffer = sb_buffer;
118 mutex_init(&fs_info->trans_mutex);
119 mutex_init(&fs_info->fs_mutex);
120 memset(&fs_info->current_insert, 0, sizeof(fs_info->current_insert));
121 memset(&fs_info->last_insert, 0, sizeof(fs_info->last_insert));
123 __setup_root(disk_super, tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
124 tree_root->node = read_tree_block(tree_root,
125 btrfs_super_root(disk_super));
126 BUG_ON(!tree_root->node);
128 ret = find_and_setup_root(disk_super, tree_root, fs_info,
129 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
132 ret = find_and_setup_root(disk_super, tree_root, fs_info,
133 BTRFS_INODE_MAP_OBJECTID, inode_root);
136 ret = find_and_setup_root(disk_super, tree_root, fs_info,
137 BTRFS_FS_TREE_OBJECTID, root);
140 root->commit_root = root->node;
143 root->fs_info->generation = root->root_key.offset + 1;
147 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
150 struct buffer_head *bh = root->fs_info->sb_buffer;
151 btrfs_set_super_root(root->fs_info->disk_super,
152 root->fs_info->tree_root->node->b_blocknr);
154 clear_buffer_dirty(bh);
155 bh->b_end_io = end_buffer_write_sync;
157 submit_bh(WRITE, bh);
159 if (!buffer_uptodate(bh)) {
166 int close_ctree(struct btrfs_root *root)
169 struct btrfs_trans_handle *trans;
171 trans = btrfs_start_transaction(root, 1);
172 btrfs_commit_transaction(trans, root);
173 /* run commit again to drop the original snapshot */
174 trans = btrfs_start_transaction(root, 1);
175 btrfs_commit_transaction(trans, root);
176 ret = btrfs_write_and_wait_transaction(NULL, root);
178 write_ctree_super(NULL, root);
181 btrfs_block_release(root, root->node);
182 if (root->fs_info->extent_root->node)
183 btrfs_block_release(root->fs_info->extent_root,
184 root->fs_info->extent_root->node);
185 if (root->fs_info->inode_root->node)
186 btrfs_block_release(root->fs_info->inode_root,
187 root->fs_info->inode_root->node);
188 if (root->fs_info->tree_root->node)
189 btrfs_block_release(root->fs_info->tree_root,
190 root->fs_info->tree_root->node);
191 btrfs_block_release(root, root->commit_root);
192 btrfs_block_release(root, root->fs_info->sb_buffer);
193 kfree(root->fs_info->extent_root);
194 kfree(root->fs_info->inode_root);
195 kfree(root->fs_info->tree_root);
196 kfree(root->fs_info);
201 void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf)