md/raid1:use bi->bv_len instead of PAGE_SIZE.

From 3d3a7eafc73f9de3eb6386ba4f30717412b6b255 Mon Sep 17 00:00:00 2001
From: majianpeng <[email protected]>
Date: Sat, 31 Mar 2012 16:01:58 +0800
Subject: [PATCH] md/raid1:use bi->bv_len instead of PAGE_SIZE. If bv_len is less PAGE_SIZE,then memcpy will waste time.

---
 drivers/md/raid1.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

index 4a40a20..a623f70 100644
@@ -1775,7 +1775,7 @@ static int process_checks(struct r1bio *r1_bio)
 			size -= PAGE_SIZE;
 			memcpy(page_address(bi->bv_page),
 			       page_address(pbio->bi_io_vec[j].bv_page),
-			       PAGE_SIZE);
+			       bi->bv_len);
 		}
 	}
 	return 0;

1.7.5.4

 				
--------------
majianpeng
2012-03-31