From: Namjae Jeon <[email protected]> It is better to use blk_queue_max_discard_sectors helper function to set max_discard_sectors as it checks max_discard_sectors upper limit UINT_MAX >> 9
similar issue was reported for mmc in below link https://lkml.org/lkml/2013/4/1/292 If multiple discard requests get merged, merged discard request's size exceeds 4GB, there is possibility that merged discard request's __data_len field may overflow. This patch fixes this issue. Signed-off-by: Namjae Jeon <[email protected]> Signed-off-by: Vivek Trivedi <[email protected]> --- 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 037288e..b9d3d2e 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -854,7 +854,7 @@ 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; + blk_queue_max_discard_sectors(disk->queue, UINT_MAX >> 9); disk->queue->limits.discard_zeroes_data = 0; blk_queue_max_hw_sectors(disk->queue, 65536); disk->queue->limits.max_sectors = 256; -- 1.7.9.5 ------------------------------------------------------------------------------ Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis & visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter _______________________________________________ Nbd-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/nbd-general
