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From: Nikanth Karthikesan <knikanth@suse.de>
Organization: suse.de
To: linux-kernel@vger.kernel.org
Subject: [PATCH] check bh->b_blocknr only if BH_Mapped is set
Date: Mon, 9 Feb 2009 17:48:11 +0530
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Cc: Jens Axboe <jens.axboe@oracle.com>,
       Andrew Morton <akpm@linux-foundation.org>
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check bh->b_blocknr only if BH_Mapped is set

Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>

---

diff --git a/fs/buffer.c b/fs/buffer.c
index 665d446..782c365 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -344,13 +344,13 @@ __find_get_block_slow(struct block_device *bdev, 
sector_t block)
 	head = page_buffers(page);
 	bh = head;
 	do {
-		if (bh->b_blocknr == block) {
+		if (!buffer_mapped(bh))
+			all_mapped = 0;
+		else if (bh->b_blocknr == block) {
 			ret = bh;
 			get_bh(bh);
 			goto out_unlock;
 		}
-		if (!buffer_mapped(bh))
-			all_mapped = 0;
 		bh = bh->b_this_page;
 	} while (bh != head);