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| author | Chris Mason <chris.mason@oracle.com> | 2008-09-06 00:13:11 +0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-09-25 19:04:07 +0400 |
| commit | e02119d5a7b4396c5a872582fddc8bd6d305a70a (patch) | |
| tree | 825efe2a79dbca8d61256183f3526a5b5dc40dc6 /fs/btrfs/tree-log.h | |
| parent | a1b32a5932cfac7c38b442582285f3da2a09dfd8 (diff) | |
| download | linux-e02119d5a7b4396c5a872582fddc8bd6d305a70a.tar.xz | |
Btrfs: Add a write ahead tree log to optimize synchronous operations
File syncs and directory syncs are optimized by copying their
items into a special (copy-on-write) log tree. There is one log tree per
subvolume and the btrfs super block points to a tree of log tree roots.
After a crash, items are copied out of the log tree and back into the
subvolume. See tree-log.c for all the details.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/tree-log.h')
| -rw-r--r-- | fs/btrfs/tree-log.h | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/fs/btrfs/tree-log.h b/fs/btrfs/tree-log.h new file mode 100644 index 000000000000..b9409b32ed02 --- /dev/null +++ b/fs/btrfs/tree-log.h @@ -0,0 +1,41 @@ +/* + * Copyright (C) 2008 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License v2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef __TREE_LOG_ +#define __TREE_LOG_ + +int btrfs_sync_log(struct btrfs_trans_handle *trans, + struct btrfs_root *root); +int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root); +int btrfs_log_dentry(struct btrfs_trans_handle *trans, + struct btrfs_root *root, struct dentry *dentry); +int btrfs_recover_log_trees(struct btrfs_root *tree_root); +int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans, + struct btrfs_root *root, struct dentry *dentry); +int btrfs_log_inode(struct btrfs_trans_handle *trans, + struct btrfs_root *root, struct inode *inode, + int inode_only); +int btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + const char *name, int name_len, + struct inode *dir, u64 index); +int btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + const char *name, int name_len, + struct inode *inode, u64 dirid); +#endif |