2007-03-23 00:13:20 +08:00
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#include <linux/module.h>
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#include <linux/fs.h>
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2007-02-02 22:18:22 +08:00
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#include "ctree.h"
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#include "disk-io.h"
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2007-03-17 04:20:31 +08:00
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#include "transaction.h"
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2007-02-02 22:18:22 +08:00
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2007-03-23 00:13:20 +08:00
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static int check_tree_block(struct btrfs_root *root, struct buffer_head *buf)
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2007-02-02 22:18:22 +08:00
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{
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2007-03-23 00:13:20 +08:00
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struct btrfs_node *node = btrfs_buffer_node(buf);
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if (buf->b_blocknr != btrfs_header_blocknr(&node->header))
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2007-02-23 21:38:36 +08:00
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BUG();
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2007-03-23 00:13:20 +08:00
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if (root->node && btrfs_header_parentid(&node->header) !=
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btrfs_header_parentid(btrfs_buffer_header(root->node)))
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2007-02-23 21:38:36 +08:00
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BUG();
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return 0;
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2007-02-02 22:18:22 +08:00
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}
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2007-03-23 00:13:20 +08:00
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struct buffer_head *alloc_tree_block(struct btrfs_root *root, u64 blocknr)
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2007-03-02 07:59:40 +08:00
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{
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2007-03-23 00:13:20 +08:00
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return sb_getblk(root->fs_info->sb, blocknr);
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2007-03-02 07:59:40 +08:00
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}
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2007-03-23 00:13:20 +08:00
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struct buffer_head *find_tree_block(struct btrfs_root *root, u64 blocknr)
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2007-02-02 22:18:22 +08:00
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{
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2007-03-23 00:13:20 +08:00
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return sb_getblk(root->fs_info->sb, blocknr);
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2007-02-02 22:18:22 +08:00
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}
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2007-03-23 00:13:20 +08:00
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struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr)
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2007-02-02 22:18:22 +08:00
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{
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2007-03-23 00:13:20 +08:00
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struct buffer_head *buf = sb_bread(root->fs_info->sb, blocknr);
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2007-02-02 22:18:22 +08:00
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2007-03-23 00:13:20 +08:00
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if (!buf)
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return buf;
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2007-02-23 21:38:36 +08:00
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if (check_tree_block(root, buf))
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2007-02-22 06:04:57 +08:00
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BUG();
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2007-02-02 22:18:22 +08:00
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return buf;
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}
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2007-03-17 04:20:31 +08:00
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int dirty_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
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2007-03-23 00:13:20 +08:00
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struct buffer_head *buf)
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2007-03-02 07:59:40 +08:00
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{
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2007-03-23 00:13:20 +08:00
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mark_buffer_dirty(buf);
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2007-03-02 07:59:40 +08:00
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return 0;
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}
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2007-03-17 04:20:31 +08:00
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int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
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2007-03-23 00:13:20 +08:00
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struct buffer_head *buf)
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2007-03-02 07:59:40 +08:00
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{
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2007-03-23 00:13:20 +08:00
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clear_buffer_dirty(buf);
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2007-03-02 07:59:40 +08:00
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return 0;
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}
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2007-03-15 02:14:43 +08:00
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static int __setup_root(struct btrfs_super_block *super,
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2007-03-21 02:38:32 +08:00
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struct btrfs_root *root,
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struct btrfs_fs_info *fs_info,
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2007-03-23 00:13:20 +08:00
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u64 objectid)
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2007-02-21 05:40:44 +08:00
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{
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2007-02-22 06:04:57 +08:00
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root->node = NULL;
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2007-03-07 09:08:01 +08:00
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root->commit_root = NULL;
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2007-03-15 02:14:43 +08:00
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root->blocksize = btrfs_super_blocksize(super);
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root->ref_cows = 0;
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2007-03-21 02:38:32 +08:00
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root->fs_info = fs_info;
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2007-03-14 04:47:54 +08:00
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memset(&root->root_key, 0, sizeof(root->root_key));
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memset(&root->root_item, 0, sizeof(root->root_item));
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return 0;
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}
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2007-03-15 02:14:43 +08:00
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static int find_and_setup_root(struct btrfs_super_block *super,
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2007-03-21 02:38:32 +08:00
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struct btrfs_root *tree_root,
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struct btrfs_fs_info *fs_info,
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u64 objectid,
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2007-03-23 00:13:20 +08:00
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struct btrfs_root *root)
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2007-03-14 04:47:54 +08:00
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{
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int ret;
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2007-03-23 00:13:20 +08:00
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__setup_root(super, root, fs_info, objectid);
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2007-03-14 04:47:54 +08:00
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ret = btrfs_find_last_root(tree_root, objectid,
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&root->root_item, &root->root_key);
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BUG_ON(ret);
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root->node = read_tree_block(root,
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btrfs_root_blocknr(&root->root_item));
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BUG_ON(!root->node);
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2007-02-21 05:40:44 +08:00
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return 0;
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}
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2007-03-23 00:13:20 +08:00
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struct btrfs_root *open_ctree(struct super_block *sb,
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struct buffer_head *sb_buffer,
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struct btrfs_super_block *disk_super)
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2007-03-21 23:12:56 +08:00
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{
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2007-03-23 00:13:20 +08:00
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struct btrfs_root *root = kmalloc(sizeof(struct btrfs_root),
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GFP_NOFS);
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struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
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GFP_NOFS);
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struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
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GFP_NOFS);
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struct btrfs_root *inode_root = kmalloc(sizeof(struct btrfs_root),
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GFP_NOFS);
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struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
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GFP_NOFS);
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2007-02-02 22:18:22 +08:00
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int ret;
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2007-03-23 00:13:20 +08:00
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/* FIXME: don't be stupid */
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if (!btrfs_super_root(disk_super))
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return NULL;
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2007-03-21 02:38:32 +08:00
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INIT_RADIX_TREE(&fs_info->pinned_radix, GFP_KERNEL);
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fs_info->running_transaction = NULL;
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fs_info->fs_root = root;
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fs_info->tree_root = tree_root;
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fs_info->extent_root = extent_root;
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fs_info->inode_root = inode_root;
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fs_info->last_inode_alloc = 0;
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fs_info->last_inode_alloc_dirid = 0;
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2007-03-23 00:13:20 +08:00
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fs_info->disk_super = disk_super;
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fs_info->sb_buffer = sb_buffer;
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fs_info->sb = sb;
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2007-03-23 03:59:16 +08:00
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mutex_init(&fs_info->trans_mutex);
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2007-03-21 02:38:32 +08:00
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memset(&fs_info->current_insert, 0, sizeof(fs_info->current_insert));
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memset(&fs_info->last_insert, 0, sizeof(fs_info->last_insert));
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2007-03-14 04:47:54 +08:00
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2007-03-23 00:13:20 +08:00
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__setup_root(disk_super, tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
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tree_root->node = read_tree_block(tree_root,
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btrfs_super_root(disk_super));
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2007-03-14 04:47:54 +08:00
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BUG_ON(!tree_root->node);
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2007-03-23 00:13:20 +08:00
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ret = find_and_setup_root(disk_super, tree_root, fs_info,
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BTRFS_EXTENT_TREE_OBJECTID, extent_root);
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2007-03-14 04:47:54 +08:00
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BUG_ON(ret);
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2007-03-23 00:13:20 +08:00
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ret = find_and_setup_root(disk_super, tree_root, fs_info,
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BTRFS_INODE_MAP_OBJECTID, inode_root);
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2007-03-21 02:38:32 +08:00
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BUG_ON(ret);
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2007-03-23 00:13:20 +08:00
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ret = find_and_setup_root(disk_super, tree_root, fs_info,
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BTRFS_FS_TREE_OBJECTID, root);
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2007-03-14 04:47:54 +08:00
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BUG_ON(ret);
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2007-03-07 09:08:01 +08:00
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root->commit_root = root->node;
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2007-03-23 00:13:20 +08:00
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get_bh(root->node);
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2007-03-14 04:47:54 +08:00
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root->ref_cows = 1;
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2007-03-21 03:57:25 +08:00
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root->fs_info->generation = root->root_key.offset + 1;
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2007-02-02 22:18:22 +08:00
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return root;
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}
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2007-03-17 04:20:31 +08:00
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int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
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2007-03-23 03:59:16 +08:00
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*root)
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2007-02-02 22:18:22 +08:00
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{
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2007-03-23 00:13:20 +08:00
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return 0;
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#if 0
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2007-02-02 22:18:22 +08:00
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int ret;
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2007-03-23 00:13:20 +08:00
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btrfs_set_super_root(s, root->fs_info->tree_root->node->b_blocknr);
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2007-03-21 02:38:32 +08:00
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ret = pwrite(root->fs_info->fp, s, sizeof(*s),
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2007-03-15 02:14:43 +08:00
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BTRFS_SUPER_INFO_OFFSET);
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2007-02-22 06:04:57 +08:00
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if (ret != sizeof(*s)) {
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fprintf(stderr, "failed to write new super block err %d\n", ret);
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2007-02-02 22:18:22 +08:00
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return ret;
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2007-02-22 06:04:57 +08:00
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}
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return 0;
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2007-03-23 00:13:20 +08:00
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#endif
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2007-02-22 06:04:57 +08:00
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}
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2007-03-23 00:13:20 +08:00
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int close_ctree(struct btrfs_root *root)
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2007-02-22 06:04:57 +08:00
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{
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2007-03-14 04:47:54 +08:00
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int ret;
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2007-03-17 04:20:31 +08:00
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struct btrfs_trans_handle *trans;
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2007-03-23 03:59:16 +08:00
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trans = btrfs_start_transaction(root, 1);
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btrfs_commit_transaction(trans, root);
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/* run commit again to drop the original snapshot */
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trans = btrfs_start_transaction(root, 1);
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btrfs_commit_transaction(trans, root);
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ret = btrfs_write_and_wait_transaction(NULL, root);
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2007-03-14 04:47:54 +08:00
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BUG_ON(ret);
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2007-03-23 03:59:16 +08:00
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write_ctree_super(NULL, root);
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2007-03-02 07:59:40 +08:00
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2007-02-22 06:04:57 +08:00
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if (root->node)
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2007-03-13 22:46:10 +08:00
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btrfs_block_release(root, root->node);
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2007-03-21 02:38:32 +08:00
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if (root->fs_info->extent_root->node)
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btrfs_block_release(root->fs_info->extent_root,
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root->fs_info->extent_root->node);
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if (root->fs_info->inode_root->node)
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btrfs_block_release(root->fs_info->inode_root,
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root->fs_info->inode_root->node);
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if (root->fs_info->tree_root->node)
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btrfs_block_release(root->fs_info->tree_root,
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root->fs_info->tree_root->node);
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2007-03-13 22:46:10 +08:00
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btrfs_block_release(root, root->commit_root);
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2007-03-23 00:13:20 +08:00
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btrfs_block_release(root, root->fs_info->sb_buffer);
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kfree(root->fs_info->extent_root);
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kfree(root->fs_info->inode_root);
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kfree(root->fs_info->tree_root);
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kfree(root->fs_info);
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kfree(root);
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2007-02-02 22:18:22 +08:00
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return 0;
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}
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2007-03-23 00:13:20 +08:00
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void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf)
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2007-02-02 22:18:22 +08:00
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{
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2007-03-23 00:13:20 +08:00
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brelse(buf);
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2007-02-02 22:18:22 +08:00
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}
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