Btrfs: load checksum data once when submitting a direct read io

The current code would load checksum data for several times when we split
a whole direct read io because of the limit of the raid stripe, it would
make us search the csum tree for several times. In fact, it just wasted time,
and made the contention of the csum tree root be more serious. This patch
improves this problem by loading the data at once.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index fd879418fd42..8bea70e02a3d 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -263,7 +263,6 @@ struct btrfs_dio_private {
 
         /* dio_bio came from fs/direct-io.c */
         struct bio *dio_bio;
-        u8 csum[0];
 };
 
 /*