These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / drivers / md / dm-cache-policy.h

diff --git a/kernel/drivers/md/dm-cache-policy.h b/kernel/drivers/md/dm-cache-policy.h
index 5524e21..05db56e 100644 (file)
--- a/kernel/drivers/md/dm-cache-policy.h
+++ b/kernel/drivers/md/dm-cache-policy.h
@@ -178,7 +178,9 @@ struct dm_cache_policy {
        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:
         *
@@ -186,7 +188,8 @@ struct dm_cache_policy {
         *
         * -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?
@@ -197,16 +200,16 @@ struct dm_cache_policy {
         * 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);