[PATCH 2/3] pnfsblock: call block plug in bl_dio_begin/end

[Peng Tao <bergwolf@gmail.com>]

Signed-off-by: Peng Tao <tao.peng@emc.com>
---
 fs/nfs/blocklayout/blocklayout.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklayout.c
index 7ae8a60..53cb450 100644
--- a/fs/nfs/blocklayout/blocklayout.c
+++ b/fs/nfs/blocklayout/blocklayout.c
@@ -996,6 +996,19 @@ bl_clear_layoutdriver(struct nfs_server *server)
 	return 0;
 }
 
+static bool bl_dio_begin(struct inode *inode, const struct iovec *iov,
+			 unsigned long nr_segs, loff_t pos,
+			 struct blk_plug *plug)
+{
+	blk_start_plug(plug);
+	return true;
+}
+
+void bl_dio_end(struct blk_plug *plug)
+{
+	blk_finish_plug(plug);
+}
+
 static const struct nfs_pageio_ops bl_pg_read_ops = {
 	.pg_init = pnfs_generic_pg_init_read,
 	.pg_test = pnfs_generic_pg_test,
@@ -1013,6 +1026,8 @@ static struct pnfs_layoutdriver_type blocklayout_type = {
 	.name				= "LAYOUT_BLOCK_VOLUME",
 	.read_pagelist			= bl_read_pagelist,
 	.write_pagelist			= bl_write_pagelist,
+	.dio_begin			= bl_dio_begin,
+	.dio_end			= bl_dio_end,
 	.alloc_layout_hdr		= bl_alloc_layout_hdr,
 	.free_layout_hdr		= bl_free_layout_hdr,
 	.alloc_lseg			= bl_alloc_lseg,
-- 
1.7.1.262.g5ef3d