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[dm-devel] [PATCH 2/2] [thin] in thin_iterate_devices(), get the pool dev size a non-blocking way.



---
 drivers/md/dm-thin.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index cd48cd8..1976a30 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -2359,10 +2359,14 @@ static int thin_iterate_devices(struct dm_target *ti,
 	dm_block_t blocks;
 	struct thin_c *tc = ti->private;
 
-	r = dm_pool_get_data_dev_size(tc->pool->pmd, &blocks);
-	if (r)
-		return r;
+	/*
+	 * We can't call dm_pool_get_data_dev_size() since that blocks.  So
+	 * we follow a more convoluted path through to the pool's target.
+	 */
+	if (!tc->pool->ti)
+		return 0;	/* nothing is bound */
 
+	blocks = tc->pool->ti->len >> tc->pool->block_shift;
 	if (blocks)
 		return fn(ti, tc->pool_dev, 0, tc->pool->sectors_per_block * blocks, data);
 
-- 
1.7.5.4


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