[patch]mm: add more blk plug

[Shaohua Li]

Some filesystems implement .writepages. We don't have blk plug
in such filesystems for .writepages.

Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx>

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 0e309cd..b9e73a1 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1253,13 +1253,16 @@ EXPORT_SYMBOL(generic_writepages);
 int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
 {
 	int ret;
+	struct blk_plug plug;
 
 	if (wbc->nr_to_write <= 0)
 		return 0;
+	blk_start_plug(&plug);
 	if (mapping->a_ops->writepages)
 		ret = mapping->a_ops->writepages(mapping, wbc);
 	else
 		ret = generic_writepages(mapping, wbc);
+	blk_finish_plug(&plug);
 	return ret;
 }
 


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