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| author | Gary S. Robertson <gary.robertson@linaro.org> | 2015-09-09 17:04:13 -0500 |
|---|---|---|
| committer | Gary S. Robertson <gary.robertson@linaro.org> | 2015-09-09 17:04:13 -0500 |
| commit | 48ffd0d5e7b2fb6e7d47344320dbeeaf15d6fd5a (patch) | |
| tree | 835283be489a3ea03d0f10ca8dbb00ad55a3cd20 /drivers/md/dm-cache-policy.h | |
| parent | aa3ff8e7ce15d756e49141d9aa3f1d9151cda1ca (diff) | |
| parent | d9e292d3ea94ab21f028108527a908e415e856ef (diff) | |
Merge tag 'lsk-v4.1-15.08-rt' of http://git.linaro.org/kernel/linux-linaro-stable into linux-linaro-lng-v4.1-rtlinux-lng-preempt-rt-4.1.5-2015.09
LSK RT 15.08 v4.1
Diffstat (limited to 'drivers/md/dm-cache-policy.h')
| -rw-r--r-- | drivers/md/dm-cache-policy.h | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/md/dm-cache-policy.h b/drivers/md/dm-cache-policy.h index f50fe360c546..5524e21e4836 100644 --- a/drivers/md/dm-cache-policy.h +++ b/drivers/md/dm-cache-policy.h @@ -70,6 +70,18 @@ enum policy_operation { }; /* + * When issuing a POLICY_REPLACE the policy needs to make a callback to + * lock the block being demoted. This doesn't need to occur during a + * writeback operation since the block remains in the cache. + */ +struct policy_locker; +typedef int (*policy_lock_fn)(struct policy_locker *l, dm_oblock_t oblock); + +struct policy_locker { + policy_lock_fn fn; +}; + +/* * This is the instruction passed back to the core target. */ struct policy_result { @@ -122,7 +134,8 @@ struct dm_cache_policy { */ int (*map)(struct dm_cache_policy *p, dm_oblock_t oblock, bool can_block, bool can_migrate, bool discarded_oblock, - struct bio *bio, struct policy_result *result); + struct bio *bio, struct policy_locker *locker, + struct policy_result *result); /* * Sometimes we want to see if a block is in the cache, without |