Adding partition locks

Adding locks to assure partition list consistency. Partition
lists is typically modified under cacheline or hash bucket lock.
This is not sufficient synchronization as adding/removing cacheline
from partition list affects neighbouring cachelines state as well.

Signed-off-by: Adam Rutkowski <adam.j.rutkowski@intel.com>

src/metadata/metadata_partition.c

@@ -26,6 +26,8 @@ void ocf_metadata_add_to_partition(struct ocf_cache *cache,
 
 	ENV_BUG_ON(!(line < line_entries));
 
+	ocf_metadata_partition_lock(&cache->metadata.lock, part_id);
+
 	/* First node to be added/ */
 	if (!part->runtime->curr_size) {
 
@@ -55,6 +57,8 @@ void ocf_metadata_add_to_partition(struct ocf_cache *cache,
 	}
 
 	part->runtime->curr_size++;
+
+	ocf_metadata_partition_unlock(&cache->metadata.lock, part_id);
 }
 
 /* Deletes the node with the given collision_index from the Partition list */
@@ -68,6 +72,8 @@ void ocf_metadata_remove_from_partition(struct ocf_cache *cache,
 
 	ENV_BUG_ON(!(line < line_entries));
 
+	ocf_metadata_partition_lock(&cache->metadata.lock, part_id);
+
 	/* Get Partition info */
 	ocf_metadata_get_partition_info(cache, line, NULL,
 			&next_line, &prev_line);
@@ -131,4 +137,6 @@ void ocf_metadata_remove_from_partition(struct ocf_cache *cache,
 	}
 
 	part->runtime->curr_size--;
+
+	ocf_metadata_partition_unlock(&cache->metadata.lock, part_id);
 }

src/metadata/metadata_structs.h

@@ -441,6 +441,7 @@ struct ocf_metadata_lock
 	env_spinlock eviction; /*!< Fast lock for eviction policy */
 	env_rwsem *hash; /*!< Hash bucket locks */
 	env_rwsem *collision_pages; /*!< Collision table page locks */
+	env_spinlock partition[OCF_IO_CLASS_MAX]; /* partition lock */
 	uint32_t num_hash_entries;  /*!< Hash bucket count */
 	uint32_t num_collision_pages; /*!< Collision table page count */
 	ocf_cache_t cache;  /*!< Parent cache object */