dm cache policy: fix description of lookup fn



Correct the documented requirement on the return code from dm cache policy
lookup functions stated in the policy module header file.

Signed-off-by: Alasdair G Kergon <agk@redhat.com>

parent 058ce5ca

drivers/md/dm-cache-policy.h

+2 −2

Original line number	Diff line number	Diff line
		@@ -130,8 +130,8 @@ struct dm_cache_policy {
		*
		* Must not block.
		*
		* Returns 1 iff in cache, 0 iff not, < 0 on error (-EWOULDBLOCK
		* would be typical).
		* Returns 0 if in cache, -ENOENT if not, < 0 for other errors
		* (-EWOULDBLOCK would be typical).
		*/
		int (lookup)(struct dm_cache_policy p, dm_oblock_t oblock, dm_cblock_t *cblock);