[PATCH 1/2] fs/block-dev.c:fix performance regression in O_DIRECT writes to md block devices.

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For regular file, write operaion used blk_plug function.But for block
file,write operation did not use blk_plug.

Signed-off-by: Jianpeng Ma <majianpeng@xxxxxxxxx>
 fs/block_dev.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index c2bbe1f..22cd436 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -215,9 +215,14 @@ blkdev_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
 	struct file *file = iocb->ki_filp;
 	struct inode *inode = file->f_mapping->host;
+	struct blk_plug plug;
+	ssize_t ret;
-	return __blockdev_direct_IO(rw, iocb, inode, I_BDEV(inode), iov, offset,
+	blk_start_plug(&plug);
+	ret =  __blockdev_direct_IO(rw, iocb, inode, I_BDEV(inode), iov, offset,
 				    nr_segs, blkdev_get_blocks, NULL, NULL, 0);
+	blk_finish_plug(&plug);
+	return ret;
 int __sync_blockdev(struct block_device *bdev, int wait)

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