imsm: add --update=uuid support

[thirdparty/mdadm.git] / super-intel.c

diff --git a/super-intel.c b/super-intel.c
index eaf5b0b8e6f979051ce48425a8222636f686eca1..110c4a89d97334b5e6220b67d06b79f0e1679cb5 100644 (file)
--- a/super-intel.c
+++ b/super-intel.c
@@ -1378,8 +1378,6 @@ static int update_super_imsm(struct supertype *st, struct mdinfo *info,
                             char *update, char *devname, int verbose,
                             int uuid_set, char *homehost)
 {
-       /* FIXME */
-
        /* For 'assemble' and 'force' we need to return non-zero if any
         * change was made.  For others, the return value is ignored.
         * Update options are:
@@ -1395,26 +1393,55 @@ static int update_super_imsm(struct supertype *st, struct mdinfo *info,
         *              linear only
         *  resync: mark as dirty so a resync will happen.
         *  name:  update the name - preserving the homehost
+        *  uuid:  Change the uuid of the array to match watch is given
         *
         * Following are not relevant for this imsm:
         *  sparc2.2 : update from old dodgey metadata
         *  super-minor: change the preferred_minor number
         *  summaries:  update redundant counters.
-        *  uuid:  Change the uuid of the array to match watch is given
         *  homehost:  update the recorded homehost
         *  _reshape_progress: record new reshape_progress position.
         */
-       int rv = 0;
-       //struct intel_super *super = st->sb;
-       //struct imsm_super *mpb = super->mpb;
+       int rv = 1;
+       struct intel_super *super = st->sb;
+       struct imsm_super *mpb;
 
-       if (strcmp(update, "grow") == 0) {
-       }
-       if (strcmp(update, "resync") == 0) {
-               /* dev->vol.dirty = 1; */
-       }
+       /* we can only update container info */
+       if (!super || super->current_vol >= 0 || !super->anchor)
+               return 1;
+
+       mpb = super->anchor;
+
+       if (strcmp(update, "uuid") == 0 && uuid_set && !info->update_private)
+               fprintf(stderr,
+                       Name ": '--uuid' not supported for imsm metadata\n");
+       else if (strcmp(update, "uuid") == 0 && uuid_set && info->update_private) {
+               mpb->orig_family_num = *((__u32 *) info->update_private);
+               rv = 0;
+       } else if (strcmp(update, "uuid") == 0) {
+               __u32 *new_family = malloc(sizeof(*new_family));
+
+               /* update orig_family_number with the incoming random
+                * data, report the new effective uuid, and store the
+                * new orig_family_num for future updates.
+                */
+               if (new_family) {
+                       memcpy(&mpb->orig_family_num, info->uuid, sizeof(__u32));
+                       uuid_from_super_imsm(st, info->uuid);
+                       *new_family = mpb->orig_family_num;
+                       info->update_private = new_family;
+                       rv = 0;
+               }
+       } else if (strcmp(update, "assemble") == 0)
+               rv = 0;
+       else
+               fprintf(stderr,
+                       Name ": '--update=%s' not supported for imsm metadata\n",
+                       update);
 
-       /* IMSM has no concept of UUID or homehost */
+       /* successful update? recompute checksum */
+       if (rv == 0)
+               mpb->check_sum = __le32_to_cpu(__gen_imsm_checksum(mpb));
 
        return rv;
 }