linux-kernel - [PATCH] check bh->b_blocknr only if BH

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Message-Id: <200902091748.12545.knikanth@suse.de>
Date:	Mon, 9 Feb 2009 17:48:11 +0530
From:	Nikanth Karthikesan <knikanth@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] check bh->b_blocknr only if BH_Mapped is set

check bh->b_blocknr only if BH_Mapped is set

Signed-off-by: Nikanth Karthikesan <knikanth@...e.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);
 

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