diff options
| author | Joe Thornber <ejt@redhat.com> | 2013-11-08 17:36:17 +0100 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2013-11-11 17:37:50 +0100 |
| commit | 532906aa7f9656209f30f08dfadd328fc1bc6912 (patch) | |
| tree | d8af8f44e38894c97a0d891152723d5b7184edc5 /drivers/md/dm-cache-policy.h | |
| parent | dm cache policy mq: reduce memory requirements (diff) | |
| download | linux-532906aa7f9656209f30f08dfadd328fc1bc6912.tar.xz linux-532906aa7f9656209f30f08dfadd328fc1bc6912.zip | |
dm cache: add remove_cblock method to policy interface
Implement policy_remove_cblock() and add remove_cblock method to the mq
policy. These methods will be used by the following cache block
invalidation patch which adds the 'invalidate_cblocks' message to the
cache core.
Also, update some comments in dm-cache-policy.h
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-cache-policy.h')
| -rw-r--r-- | drivers/md/dm-cache-policy.h | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/drivers/md/dm-cache-policy.h b/drivers/md/dm-cache-policy.h index 33369ca9614f..052c00a84a5c 100644 --- a/drivers/md/dm-cache-policy.h +++ b/drivers/md/dm-cache-policy.h @@ -135,9 +135,6 @@ struct dm_cache_policy { */ int (*lookup)(struct dm_cache_policy *p, dm_oblock_t oblock, dm_cblock_t *cblock); - /* - * oblock must be a mapped block. Must not block. - */ void (*set_dirty)(struct dm_cache_policy *p, dm_oblock_t oblock); void (*clear_dirty)(struct dm_cache_policy *p, dm_oblock_t oblock); @@ -159,8 +156,24 @@ struct dm_cache_policy { void (*force_mapping)(struct dm_cache_policy *p, dm_oblock_t current_oblock, dm_oblock_t new_oblock); - int (*writeback_work)(struct dm_cache_policy *p, dm_oblock_t *oblock, dm_cblock_t *cblock); + /* + * This is called via the invalidate_cblocks message. It is + * possible the particular cblock has already been removed due to a + * write io in passthrough mode. In which case this should return + * -ENODATA. + */ + int (*remove_cblock)(struct dm_cache_policy *p, dm_cblock_t cblock); + /* + * Provide a dirty block to be written back by the core target. + * + * Returns: + * + * 0 and @cblock,@oblock: block to write back provided + * + * -ENODATA: no dirty blocks available + */ + int (*writeback_work)(struct dm_cache_policy *p, dm_oblock_t *oblock, dm_cblock_t *cblock); /* * How full is the cache? |