int (*remove_cblock)(struct dm_cache_policy *p, dm_cblock_t cblock);
/*
- * Provide a dirty block to be written back by the core target.
+ * Provide a dirty block to be written back by the core target. If
+ * critical_only is set then the policy should only provide work if
+ * it urgently needs it.
*
* Returns:
*
*
* -ENODATA: no dirty blocks available
*/
- int (*writeback_work)(struct dm_cache_policy *p, dm_oblock_t *oblock, dm_cblock_t *cblock);
+ int (*writeback_work)(struct dm_cache_policy *p, dm_oblock_t *oblock, dm_cblock_t *cblock,
+ bool critical_only);
/*
* How full is the cache?
* Because of where we sit in the block layer, we can be asked to
* map a lot of little bios that are all in the same block (no
* queue merging has occurred). To stop the policy being fooled by
- * these the core target sends regular tick() calls to the policy.
+ * these, the core target sends regular tick() calls to the policy.
* The policy should only count an entry as hit once per tick.
*/
- void (*tick)(struct dm_cache_policy *p);
+ void (*tick)(struct dm_cache_policy *p, bool can_block);
/*
* Configuration.
*/
- int (*emit_config_values)(struct dm_cache_policy *p,
- char *result, unsigned maxlen);
+ int (*emit_config_values)(struct dm_cache_policy *p, char *result,
+ unsigned maxlen, ssize_t *sz_ptr);
int (*set_config_value)(struct dm_cache_policy *p,
const char *key, const char *value);