config: Don't require an array to have a device name.

i.e. in mdadm.conf you can have a line like

   ARRAY uuid=whatever

and it will use auto-name-generation to give a name to the array at
assemble-time.  The is different from blind auto-assembly in that the
array will be treated as 'local'.

Incremental.c

@@ -154,7 +154,7 @@ int Incremental(char *devname, int verbose, int runstop,
 		if (array_list->uuid_set &&
 		    same_uuid(array_list->uuid, info.uuid, st->ss->swapuuid)
 		    == 0) {
-			if (verbose >= 2)
+			if (verbose >= 2 && array_list->devname)
 				fprintf(stderr, Name
 					": UUID differs from %s.\n",
 					array_list->devname);
@@ -162,7 +162,7 @@ int Incremental(char *devname, int verbose, int runstop,
 		}
 		if (array_list->name[0] &&
 		    strcasecmp(array_list->name, info.name) != 0) {
-			if (verbose >= 2)
+			if (verbose >= 2 && array_list->devname)
 				fprintf(stderr, Name
 					": Name differs from %s.\n",
 					array_list->devname);
@@ -170,7 +170,7 @@ int Incremental(char *devname, int verbose, int runstop,
 		}
 		if (array_list->devices &&
 		    !match_oneof(array_list->devices, devname)) {
-			if (verbose >= 2)
+			if (verbose >= 2 && array_list->devname)
 				fprintf(stderr, Name
 					": Not a listed device for %s.\n",
 					array_list->devname);
@@ -178,7 +178,7 @@ int Incremental(char *devname, int verbose, int runstop,
 		}
 		if (array_list->super_minor != UnSet &&
 		    array_list->super_minor != info.array.md_minor) {
-			if (verbose >= 2)
+			if (verbose >= 2 && array_list->devname)
 				fprintf(stderr, Name
 					": Different super-minor to %s.\n",
 					array_list->devname);
@@ -188,7 +188,7 @@ int Incremental(char *devname, int verbose, int runstop,
 		    !array_list->name[0] &&
 		    !array_list->devices &&
 		    array_list->super_minor == UnSet) {
-			if (verbose  >= 2)
+			if (verbose >= 2 && array_list->devname)
 				fprintf(stderr, Name
 			     ": %s doesn't have any identifying information.\n",
 					array_list->devname);
@@ -197,10 +197,15 @@ int Incremental(char *devname, int verbose, int runstop,
 		/* FIXME, should I check raid_disks and level too?? */
 
 		if (match) {
-			if (verbose >= 0)
+			if (verbose >= 0) {
-				fprintf(stderr, Name
+				if (match->devname && array_list->devname)
+					fprintf(stderr, Name
 		   ": we match both %s and %s - cannot decide which to use.\n",
-					match->devname, array_list->devname);
+						match->devname, array_list->devname);
+				else
+					fprintf(stderr, Name
+						": multiple lines in mdadm.conf match\n");
+			}
 			return 2;
 		}
 		match = array_list;
@@ -656,7 +661,8 @@ int IncrementalScan(int verbose)
 		}
 		/* Ok, we can try this one.   Maybe it needs a bitmap */
 		for (mddev = devs ; mddev ; mddev = mddev->next)
-			if (strcmp(mddev->devname, me->path) == 0)
+			if (mddev->devname
+			    && strcmp(mddev->devname, me->path) == 0)
 				break;
 		if (mddev && mddev->bitmap_file) {
 			/*

Monitor.c

@@ -165,7 +165,10 @@ int Monitor(mddev_dev_t devlist,
 	if (devlist == NULL) {
 		mddev_ident_t mdlist = conf_get_ident(NULL);
 		for (; mdlist; mdlist=mdlist->next) {
-			struct state *st = malloc(sizeof *st);
+			struct state *st;
+			if (mdlist->devname == NULL)
+				continue;
+			st = malloc(sizeof *st);
 			if (st == NULL)
 				continue;
 			st->devname = strdup(mdlist->devname);

config.c

@@ -529,14 +529,12 @@ void arrayline(char *line)
 				w);
 		}
 	}
-	if (mis.devname == NULL)
+	if (mis.uuid_set == 0 && mis.devices == NULL && mis.super_minor == UnSet && mis.name[0] == 0)
-		fprintf(stderr, Name ": ARRAY line with no device\n");
-	else if (mis.uuid_set == 0 && mis.devices == NULL && mis.super_minor == UnSet && mis.name[0] == 0)
 		fprintf(stderr, Name ": ARRAY line %s has no identity information.\n", mis.devname);
 	else {
 		mi = malloc(sizeof(*mi));
 		*mi = mis;
-		mi->devname = strdup(mis.devname);
+		mi->devname = mis.devname ? strdup(mis.devname) : NULL;
 		mi->next = NULL;
 		*mddevlp = mi;
 		mddevlp = &mi->next;
@@ -721,7 +719,8 @@ mddev_ident_t conf_get_ident(char *dev)
 	mddev_ident_t rv;
 	load_conffile();
 	rv = mddevlist;
-	while (dev && rv && strcmp(dev, rv->devname)!=0)
+	while (dev && rv && (rv->devname == NULL
+			     || strcmp(dev, rv->devname)!=0))
 		rv = rv->next;
 	return rv;
 }

mdadm.c

@@ -1082,16 +1082,6 @@ int main(int argc, char *argv[])
 				exit(1);
 			}
 			for (; array_list; array_list = array_list->next) {
-				mdfd = open_mddev(array_list->devname, 0);
-				if (mdfd >= 0) {
-					mdu_array_info_t array;
-					/* skip if already assembled */
-					if (ioctl(mdfd, GET_ARRAY_INFO, &array)>=0) {
-						cnt++;
-						close(mdfd);
-						continue;
-					}
-				}
 				if (array_list->autof == 0)
 					array_list->autof = autof;