From 7237f1833601dcc435a64176c2c347ec4bd959f9 Mon Sep 17 00:00:00 2001 From: Yan Zheng <zheng.yan@oracle.com> Date: Wed, 21 Jan 2009 12:54:03 -0500 Subject: Btrfs: fix tree logs parallel sync To improve performance, btrfs_sync_log merges tree log sync requests. But it wrongly merges sync requests for different tree logs. If multiple tree logs are synced at the same time, only one of them actually gets synced. This patch has following changes to fix the bug: Move most tree log related fields in btrfs_fs_info to btrfs_root. This allows merging sync requests separately for each tree log. Don't insert root item into the log root tree immediately after log tree is allocated. Root item for log tree is inserted when log tree get synced for the first time. This allows syncing the log root tree without first syncing all log trees. At tree-log sync, btrfs_sync_log first sync the log tree; then updates corresponding root item in the log root tree; sync the log root tree; then update the super block. Signed-off-by: Yan Zheng <zheng.yan@oracle.com> --- fs/btrfs/disk-io.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'fs/btrfs/disk-io.h') diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h index c0ff404c31b7..494a56eb2986 100644 --- a/fs/btrfs/disk-io.h +++ b/fs/btrfs/disk-io.h @@ -98,5 +98,7 @@ int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans, struct btrfs_fs_info *fs_info); int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, struct btrfs_fs_info *fs_info); +int btrfs_add_log_tree(struct btrfs_trans_handle *trans, + struct btrfs_root *root); int btree_lock_page_hook(struct page *page); #endif -- cgit