[PATCH 1/6] Btrfs: don't auto defrag a file when doing directIO
From: Miao Xie <hidden>
Date: 2012-12-05 10:52:24
Subsystem:
btrfs file system, filesystems (vfs and infrastructure), the rest · Maintainers:
Chris Mason, David Sterba, Alexander Viro, Christian Brauner, Linus Torvalds
If we runt the direct IO, we should not run auto defrag, because it may introduce buffered IO vs direcIO problem, and make direct IO slow down. Signed-off-by: Miao Xie <redacted> --- fs/btrfs/inode.c | 3 --- 1 file changed, 3 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 5fc0990..b08e4b1 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c@@ -5674,9 +5674,6 @@ static struct extent_map *btrfs_new_extent_direct(struct inode *inode, if (IS_ERR(trans)) return ERR_CAST(trans); - if (start <= BTRFS_I(inode)->disk_i_size && len < 64 * 1024) - btrfs_add_inode_defrag(trans, inode); - trans->block_rsv = &root->fs_info->delalloc_block_rsv; alloc_hint = get_extent_allocation_hint(inode, start, len);
--
1.7.11.7