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Message-Id: <1395791307-23727-2-git-send-email-gwendal@chromium.org> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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