[PATCH] Change uuid for partitions and internal devices

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From: Phillip Susi <[email protected]>
Subject: Change uuid for partitions and internal devices
Description: Change the uuid for internal devices ( like
 each half of a raid10 ) so that the rest of the system
 can recognize that the internal device should not be
 probed for partitions or filesystems or mounted.  Also
 change partition's uuid to have the same "partNN-"
 prefix that kpartx gives them.

Index: b/1.0.0.rc16/lib/activate/devmapper.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- a/1.0.0.rc16/lib/activate/devmapper.c
+++ b/1.0.0.rc16/lib/activate/devmapper.c
@@ -171,8 +171,18 @@ dmraid_uuid(struct lib_context *lc, stru
 	/* Clear garbage data from uuid string */
 	memset(uuid, 0, uuid_len);
=20
-	/* Create UUID string from subsystem prefix and RAID set name. */
-	r =3D snprintf(uuid, uuid_len, "DMRAID-%s", name) < uuid_len;
+	/* Create UUID string from subsystem prefix and RAID set name.  *
+	 * Prefix partitions with "partNN-" and add an 'I' for internal *
+	 * for stacked devices ( each half of a raid10 )                */
+
+	if (rs->type & t_partition) {
+		char *part;
+		for (part =3D name + strlen(name) - 1; isdigit(*part); part--);
+		part++;
+		r =3D snprintf(uuid, uuid_len, "part%s-DMRAID-%S", part, name) < uuid_=
len;
+	} else if (rs->flags & f_subset)
+		r =3D snprintf(uuid, uuid_len, "DMRAIDI-%s", name) < uuid_len;
+	else r =3D snprintf(uuid, uuid_len, "DMRAID-%s", name) < uuid_len;
 	return r < 0 ? 0 : (r < uuid_len);
 }
=20
Index: b/1.0.0.rc16/include/dmraid/metadata.h
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- a/1.0.0.rc16/include/dmraid/metadata.h
+++ b/1.0.0.rc16/include/dmraid/metadata.h
@@ -177,6 +177,7 @@ enum flags {
 	f_maximize =3D 0x01,	/* If set, maximize set capacity,
 				   if not set, limit to smallest device. */
 	f_partitions =3D 0x02,	/* Set has partitions. */
+	f_subset =3D 0x04,	/* Set is an internal subset ( half of raid10 ) */
 };
=20
 #define	F_MAXIMIZE(rs)		((rs)->flags & f_maximize)
Index: b/1.0.0.rc16/lib/format/ataraid/isw.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- a/1.0.0.rc16/lib/format/ataraid/isw.c
+++ b/1.0.0.rc16/lib/format/ataraid/isw.c
@@ -877,7 +877,8 @@ group_rd(struct lib_context *lc,
 				free_raid_dev(lc, &rd);
 				return NULL;
 			}
-
+			if (is_raid10(dev))
+				rs->flags |=3D f_subset;
 			rs->status =3D s_ok;
=20
 			/* Save and set to enable dev_sort(). */
Index: b/1.0.0.rc16/lib/format/format.c
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
--- a/1.0.0.rc16/lib/format/format.c
+++ b/1.0.0.rc16/lib/format/format.c
@@ -649,9 +649,10 @@ join_superset(struct lib_context *lc,
 	if ((n =3D f_name(lc, rd, 0))) {
 		if ((ret =3D find_or_alloc_raid_set(lc, n, FIND_TOP, NO_RD,
 						  LC_RS(lc), f_create, rd)) &&
-		    !find_set(lc, &ret->sets, rs->name, FIND_TOP))
+		    !find_set(lc, &ret->sets, rs->name, FIND_TOP)) {
 			list_add_sorted(lc, &ret->sets, &rs->list, f_set_sort);
-
+			rs->flags |=3D f_subset;
+		}
 		dbg_free(n);
 	}
=20

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