imsm: Update-subarray for write-intent bitmap

The patch updates the current bitmap functionality to handle adding
the bitmap on existing volumes.

Signed-off-by: Jakub Radtke <jakub.radtke@intel.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>

diff --git a/super-intel.c b/super-intel.c
index 4284ddeaba0cb4a0b16bafbac30ea4ff20176073..65b44e62ba04cef1681ce1fbbed52c0f6af5a9b3 100644 (file)
--- a/super-intel.c
+++ b/super-intel.c
@@ -7772,6 +7772,19 @@ static int kill_subarray_imsm(struct supertype *st, char *subarray_id)
        return 0;
 }
 
+static int get_rwh_policy_from_update(char *update)
+{
+       if (strcmp(update, "ppl") == 0)
+               return RWH_MULTIPLE_DISTRIBUTED;
+       else if (strcmp(update, "no-ppl") == 0)
+               return RWH_MULTIPLE_OFF;
+       else if (strcmp(update, "bitmap") == 0)
+               return RWH_BITMAP;
+       else if (strcmp(update, "no-bitmap") == 0)
+               return RWH_OFF;
+       return -1;
+}
+
 static int update_subarray_imsm(struct supertype *st, char *subarray,
                                char *update, struct mddev_ident *ident)
 {
@@ -7818,8 +7831,7 @@ static int update_subarray_imsm(struct supertype *st, char *subarray,
                        }
                        super->updates_pending++;
                }
-       } else if (strcmp(update, "ppl") == 0 ||
-                  strcmp(update, "no-ppl") == 0) {
+       } else if (get_rwh_policy_from_update(update) != -1) {
                int new_policy;
                char *ep;
                int vol = strtoul(subarray, &ep, 10);
@@ -7827,10 +7839,7 @@ static int update_subarray_imsm(struct supertype *st, char *subarray,
                if (*ep != '\0' || vol >= super->anchor->num_raid_devs)
                        return 2;
 
-               if (strcmp(update, "ppl") == 0)
-                       new_policy = RWH_MULTIPLE_DISTRIBUTED;
-               else
-                       new_policy = RWH_MULTIPLE_OFF;
+               new_policy = get_rwh_policy_from_update(update);
 
                if (st->update_tail) {
                        struct imsm_update_rwh_policy *u = xmalloc(sizeof(*u));
@@ -7846,6 +7855,8 @@ static int update_subarray_imsm(struct supertype *st, char *subarray,
                        dev->rwh_policy = new_policy;
                        super->updates_pending++;
                }
+               if (new_policy == RWH_BITMAP)
+                       return write_init_bitmap_imsm_vol(st, vol);
        } else
                return 2;