From d0c803c4049c5ca322d4795d8b74f28768603e0e Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Thu, 11 Sep 2008 16:17:57 -0400 Subject: Btrfs: Record dirty pages tree-log pages in an extent_io tree This is the same way the transaction code makes sure that all the other tree blocks are safely on disk. There's an extent_io tree for each root, and any blocks allocated to the tree logs are recorded in that tree. At tree-log sync, the extent_io tree is walked to flush down the dirty pages and wait for them. The main benefit is less time spent walking the tree log and skipping clean pages, and getting sequential IO down to the drive. Signed-off-by: Chris Mason --- fs/btrfs/disk-io.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) (limited to 'fs/btrfs/disk-io.c') diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 5edb7f88579..57fbf107e59 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -777,6 +777,8 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, spin_lock_init(&root->list_lock); mutex_init(&root->objectid_mutex); mutex_init(&root->log_mutex); + extent_io_tree_init(&root->dirty_log_pages, + fs_info->btree_inode->i_mapping, GFP_NOFS); btrfs_leaf_ref_tree_init(&root->ref_tree_struct); root->ref_tree = &root->ref_tree_struct; @@ -819,11 +821,23 @@ int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans, struct btrfs_fs_info *fs_info) { struct extent_buffer *eb; + struct btrfs_root *log_root_tree = fs_info->log_root_tree; + u64 start = 0; + u64 end = 0; int ret; - if (!fs_info->log_root_tree) + if (!log_root_tree) return 0; + while(1) { + ret = find_first_extent_bit(&log_root_tree->dirty_log_pages, + 0, &start, &end, EXTENT_DIRTY); + if (ret) + break; + + clear_extent_dirty(&log_root_tree->dirty_log_pages, + start, end, GFP_NOFS); + } eb = fs_info->log_root_tree->node; WARN_ON(btrfs_header_level(eb) != 0); @@ -1412,7 +1426,6 @@ struct btrfs_root *open_ctree(struct super_block *sb, memset(&BTRFS_I(fs_info->btree_inode)->location, 0, sizeof(struct btrfs_key)); insert_inode_hash(fs_info->btree_inode); - mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS); mutex_init(&fs_info->trans_mutex); mutex_init(&fs_info->tree_log_mutex); -- cgit v1.2.3