From: Mike Snitzer Support a non-power-of-2 discard granularity in dm-thin, now that the block layer supports this(via 8dd2cb7e880d2f77fba53b523c99133ad5054cfd "block: discard granularity might not be power of 2" and 59771079c18c44e39106f0f30054025acafadb41 "blk: avoid divide-by-zero with zero discard granularity"). Signed-off-by: Mike Snitzer Signed-off-by: Alasdair G Kergon --- drivers/md/dm-thin.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) Index: linux/drivers/md/dm-thin.c =================================================================== --- linux.orig/drivers/md/dm-thin.c +++ linux/drivers/md/dm-thin.c @@ -2443,15 +2443,8 @@ static void set_discard_limits(struct po if (pt->adjusted_pf.discard_passdown) { data_limits = &bdev_get_queue(pt->data_dev->bdev)->limits; limits->discard_granularity = data_limits->discard_granularity; - } else if (block_size_is_power_of_two(pool)) + } else limits->discard_granularity = pool->sectors_per_block << SECTOR_SHIFT; - else - /* - * Use largest power of 2 that is a factor of sectors_per_block - * but at least DATA_DEV_BLOCK_SIZE_MIN_SECTORS. - */ - limits->discard_granularity = max(1 << (ffs(pool->sectors_per_block) - 1), - DATA_DEV_BLOCK_SIZE_MIN_SECTORS) << SECTOR_SHIFT; } static void pool_io_hints(struct dm_target *ti, struct queue_limits *limits)