dm-thin: fix discard_granularity The kernel expects that limits->discard_granularity is a power of two. Set this limit only if we use a power of two block size. Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx> --- drivers/md/dm-thin.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: linux-3.5-rc6-fast/drivers/md/dm-thin.c =================================================================== --- linux-3.5-rc6-fast.orig/drivers/md/dm-thin.c 2012-07-16 20:07:49.000000000 +0200 +++ linux-3.5-rc6-fast/drivers/md/dm-thin.c 2012-07-16 20:08:01.000000000 +0200 @@ -2502,7 +2502,8 @@ static void set_discard_limits(struct po * bios cover a block partially. A discard that spans a block boundary * is not sent to this target. */ - limits->discard_granularity = pool->sectors_per_block << SECTOR_SHIFT; + if (pool->sectors_per_block_shift >= 0) + limits->discard_granularity = pool->sectors_per_block << SECTOR_SHIFT; limits->discard_zeroes_data = pool->pf.zero_new_blocks; } -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
