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

[cascardo/linux.git] / drivers / md / dm-thin.c

diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 6578b7b..6fcbfb0 100644 (file)
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -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 */