libdm: enforce writethrough mode for cleaner

With "cleaner" policy always use 'writethrough' mode.

diff --git a/WHATS_NEW_DM b/WHATS_NEW_DM
index e89ead0d3ee96c5466db80e85a03b1bfa7815557..e76087588fc10fb0120ea5bd89963dd7efdc9e54 100644 (file)
--- a/WHATS_NEW_DM
+++ b/WHATS_NEW_DM
@@ -1,5 +1,6 @@
 Version 1.02.110 - 
 ======================================
+  Enforce writethrough mode for cleaner policy.
   Add support for recognition and deactivation of MD devices to blkdeactivate.
   Move target status functions out of libdm-deptree.
   Correct use of max_write_behind parameter when generating raid target line.

diff --git a/libdm/libdm-deptree.c b/libdm/libdm-deptree.c
index ef283e9c0e944fd0ec2c71a1d875b63d720b1000..afdce8d726d4c30177392842508fb0b59577167c 100644 (file)
--- a/libdm/libdm-deptree.c
+++ b/libdm/libdm-deptree.c
@@ -3302,7 +3302,8 @@ int dm_tree_node_add_cache_target(struct dm_tree_node *node,
                return_0;
 
        seg->data_block_size = data_block_size;
-       seg->flags = feature_flags;
+       /* Enforce WriteThough mode for cleaner policy */
+       seg->flags = (strcmp(policy_name, "cleaner") == 0) ? DM_CACHE_FEATURE_WRITETHROUGH : feature_flags;
        seg->policy_name = policy_name;
 
        /* FIXME: better validation missing */