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/transaction.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) (limited to 'fs/btrfs/transaction.c') diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 61a377bcb2f..151b00d5259 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -302,23 +302,18 @@ int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, } -int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, - struct btrfs_root *root) +int btrfs_write_and_wait_marked_extents(struct btrfs_root *root, + struct extent_io_tree *dirty_pages) { int ret; int err = 0; int werr = 0; - struct extent_io_tree *dirty_pages; struct page *page; struct inode *btree_inode = root->fs_info->btree_inode; u64 start = 0; u64 end; unsigned long index; - if (!trans || !trans->transaction) { - return filemap_write_and_wait(btree_inode->i_mapping); - } - dirty_pages = &trans->transaction->dirty_pages; while(1) { ret = find_first_extent_bit(dirty_pages, start, &start, &end, EXTENT_DIRTY); @@ -385,6 +380,18 @@ int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, return werr; } +int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, + struct btrfs_root *root) +{ + if (!trans || !trans->transaction) { + struct inode *btree_inode; + btree_inode = root->fs_info->btree_inode; + return filemap_write_and_wait(btree_inode->i_mapping); + } + return btrfs_write_and_wait_marked_extents(root, + &trans->transaction->dirty_pages); +} + static int update_cowonly_root(struct btrfs_trans_handle *trans, struct btrfs_root *root) { -- cgit v1.2.3-70-g09d2