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dm cache policy: fix description of lookup fn

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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>
This commit is contained in:
Alasdair G Kergon 2013-05-10 14:37:17 +01:00
parent 058ce5ca81
commit e12c1fd9d6
1 changed files with 2 additions and 2 deletions
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4
drivers/md/dm-cache-policy.h
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@ -130,8 +130,8 @@ struct dm_cache_policy {
* *
* Must not block. * Must not block.
* *
* Returns 1 iff in cache, 0 iff not, < 0 on error (-EWOULDBLOCK * Returns 0 if in cache, -ENOENT if not, < 0 for other errors
* would be typical). * (-EWOULDBLOCK would be typical).
*/ */
int (*lookup)(struct dm_cache_policy *p, dm_oblock_t oblock, dm_cblock_t *cblock); int (*lookup)(struct dm_cache_policy *p, dm_oblock_t oblock, dm_cblock_t *cblock);