linux-kernel - [PATCH 1/4] Limit max_discard_sectors to UINT

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Date:	Tue, 25 Mar 2014 16:48:23 -0700
From:	Gwendal Grignou <gwendal@...omium.org>
To:	axboe@...nel.dk, ulf.hansson@...aro.org
Cc:	linux-mtd@...ts.infradead.org, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Gwendal Grignou <gwendal@...omium.org>
Subject: [PATCH 1/4] Limit max_discard_sectors to UINT_MAX>>9

max_discard_sectors can not be larger than UINT_MAX>>9,
otherwise, there is a risk that discard requests would be merged
into a request larger than 4GB.

Signed-off-by: Gwendal Grignou <gwendal@...omium.org>
---
 drivers/block/nbd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 2dc3b51..f30128b 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -859,7 +859,7 @@ static int __init nbd_init(void)
 		 */
 		queue_flag_set_unlocked(QUEUE_FLAG_NONROT, disk->queue);
 		disk->queue->limits.discard_granularity = 512;
-		disk->queue->limits.max_discard_sectors = UINT_MAX;
+		disk->queue->limits.max_discard_sectors = UINT_MAX >> 9;
 		disk->queue->limits.discard_zeroes_data = 0;
 		blk_queue_max_hw_sectors(disk->queue, 65536);
 		disk->queue->limits.max_sectors = 256;
-- 
1.9.1.423.g4596e3a

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