From a5db7d1acdb54b7f188eb916f711733e34da5b5f Mon Sep 17 00:00:00 2001 From: Jack Wang Date: Fri, 15 Apr 2016 16:05:16 +0200 Subject: [PATCH] brd: set max_discard_sectors properly blkdiscard -v /dev/ram0 fails with IO errors, the reason seems to be, it set max_discard_sectors to UINT_MAX, which seems to wrong, need to convert to sectors. After this change blkdiscard works. Signed-off-by: Jack Wang --- drivers/block/brd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/block/brd.c b/drivers/block/brd.c index a5880f4..a5e3c0f 100644 --- a/drivers/block/brd.c +++ b/drivers/block/brd.c @@ -503,7 +503,7 @@ static struct brd_device *brd_alloc(int i) blk_queue_physical_block_size(brd->brd_queue, PAGE_SIZE); brd->brd_queue->limits.discard_granularity = PAGE_SIZE; - blk_queue_max_discard_sectors(brd->brd_queue, UINT_MAX); + blk_queue_max_discard_sectors(brd->brd_queue, UINT_MAX >> 9); brd->brd_queue->limits.discard_zeroes_data = 1; queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, brd->brd_queue); -- 1.9.1