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Commit 21607670 authored by Mike Snitzer's avatar Mike Snitzer
Browse files

dm thin: disable discard support for thin devices if pool's is disabled 



If the pool is configured with 'ignore_discard' its discard support is
disabled.  The pool's thin devices should also have queue_limits that
reflect discards are disabled.

Fixes: 34fbcf62 ("dm thin: range discard support")
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # 4.1+
parent 6ff33f39

drivers/md/dm-thin.c

+4 −0
Original line number Diff line number Diff line
@@ -4249,6 +4249,10 @@ static void thin_io_hints(struct dm_target *ti, struct queue_limits *limits) 
{

	struct thin_c *tc = ti->private;

	struct pool *pool = tc->pool;

	struct queue_limits *pool_limits = dm_get_queue_limits(pool->pool_md);



	if (!pool_limits->discard_granularity)

		return; /* pool's discard support is disabled */



	limits->discard_granularity = pool->sectors_per_block << SECTOR_SHIFT;

	limits->max_discard_sectors = 2048 * 1024 * 16; /* 16G */