bcache: Fix discard granularity

blk_stack_limits() doesn't like a discard granularity of 0.

Signed-off-by: Kent Overstreet <kmo@daterainc.com>

diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 5136e11..fb34327 100644 (file)
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -843,6 +843,7 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size,
        q->limits.max_segment_size      = UINT_MAX;
        q->limits.max_segments          = BIO_MAX_PAGES;
        q->limits.max_discard_sectors   = UINT_MAX;
+       q->limits.discard_granularity   = 512;
        q->limits.io_min                = block_size;
        q->limits.logical_block_size    = block_size;
        q->limits.physical_block_size   = block_size;