Just like all block I/O, discards are in units of sectors. Thus setting a smaller than sector size discard limit in case of > 512 byte sectors in bcache doesn't make sense. Always set the discard granularity to 512 bytes instead. Signed-off-by: Christoph Hellwig <hch@xxxxxx> --- drivers/md/bcache/super.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index bfe1685dbae574..ecc1447f202a42 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -954,7 +954,7 @@ static int bcache_device_init(struct bcache_device *d, unsigned int block_size, q->limits.max_segment_size = UINT_MAX; q->limits.max_segments = BIO_MAX_VECS; blk_queue_max_discard_sectors(q, UINT_MAX); - q->limits.discard_granularity = 512; + q->limits.discard_granularity = block_size; q->limits.io_min = block_size; q->limits.logical_block_size = block_size; q->limits.physical_block_size = block_size; -- 2.39.2
