linux-kernel - [PATCH] block: fix blk_queue_alignment

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Date:	Mon, 20 Jul 2009 00:36:49 +0200
From:	Christoph Hellwig <hch@....de>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] block: fix blk_queue_alignment_offset

We need to mask out bits inside the logical block, not outside of it,
otherwise we'll always get a 0 alignment_offset.


Signed-off-by: Christoph Hellwig <hch@....de>

Index: linux-2.6/block/blk-settings.c
===================================================================
--- linux-2.6.orig/block/blk-settings.c	2009-07-19 23:53:13.674148645 +0200
+++ linux-2.6/block/blk-settings.c	2009-07-20 00:33:06.384900956 +0200
@@ -371,7 +371,7 @@ EXPORT_SYMBOL(blk_queue_physical_block_s
 void blk_queue_alignment_offset(struct request_queue *q, unsigned int offset)
 {
 	q->limits.alignment_offset =
-		offset & (q->limits.physical_block_size - 1);
+		offset & ~(q->limits.physical_block_size - 1);
 	q->limits.misaligned = 0;
 }
 EXPORT_SYMBOL(blk_queue_alignment_offset);
--
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