Generic support for --consistency-policy and PPL

Add a new parameter to mdadm: --consistency-policy=. It determines how
the array maintains consistency in case of unexpected shutdown. This
maps to the md sysfs attribute 'consistency_policy'. It can be used to
create a raid5 array using PPL. Add the necessary plumbing to pass this
option to metadata handlers. The write journal and bitmap
functionalities are treated as different policies, which are implicitly
selected when using --write-journal or --bitmap options.

Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Jes Sorensen <Jes.Sorensen@gmail.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/maps.c b/maps.c
index 64f1df2..d9ee7de 100644
--- a/maps.c
+++ b/maps.c
@@ -129,6 +129,16 @@ mapping_t faultylayout[] = {
 	{ NULL, 0}
 };
 
+mapping_t consistency_policies[] = {
+	{ "unknown", CONSISTENCY_POLICY_UNKNOWN},
+	{ "none", CONSISTENCY_POLICY_NONE},
+	{ "resync", CONSISTENCY_POLICY_RESYNC},
+	{ "bitmap", CONSISTENCY_POLICY_BITMAP},
+	{ "journal", CONSISTENCY_POLICY_JOURNAL},
+	{ "ppl", CONSISTENCY_POLICY_PPL},
+	{ NULL, 0}
+};
+
 char *map_num(mapping_t *map, int num)
 {
 	while (map->name) {