Let dmsetup store the uuid on device creation.

libdm/ioctl/libdevmapper.c

@@ -40,6 +40,9 @@ void dm_task_destroy(struct dm_task *dmt)
 	if (dmt->dmi)
 		free(dmt->dmi);
 
+	if (dmt->uuid)
+		free(dmt->uuid);
+
 	free(dmt);
 }
 
@@ -225,6 +228,9 @@ static struct dm_ioctl *_flatten(struct dm_task *dmt)
 		dmi->dev = MKDEV(0, dmt->minor);
 	}
 
+	if (dmt->uuid)
+		strncpy(dmi->uuid, dmt->uuid, sizeof(dmi->uuid));
+
 	dmi->target_count = count;
 
 	b = (void *) (dmi + 1);

libdm/ioctl/libdm-targets.h

@@ -23,5 +23,7 @@ struct dm_task {
 	int minor;
 	struct dm_ioctl *dmi;
 	char *newname;
+
+	char *uuid;
 };
 

libdm/libdevmapper.h

@@ -52,6 +52,7 @@ struct dm_task *dm_task_create(int type);
 void dm_task_destroy(struct dm_task *dmt);
 
 int dm_task_set_name(struct dm_task *dmt, const char *name);
+int dm_task_set_uuid(struct dm_task *dmt, const char *uuid);
 
 /*
  * Retrieve attributes after an info.

libdm/libdm-common.c

@@ -86,8 +86,10 @@ int dm_task_set_name(struct dm_task *dmt, const char *name)
 	char path[PATH_MAX];
 	struct stat st1, st2;
 
-        if (dmt->dev_name)
+        if (dmt->dev_name) {
                 free(dmt->dev_name);
+		dmt->dev_name = NULL;
+	}
 
 	/* If path was supplied, remove it if it points to the same device
 	 * as its last component.
@@ -112,6 +114,21 @@ int dm_task_set_name(struct dm_task *dmt, const char *name)
         return 1;
 }
 
+int dm_task_set_uuid(struct dm_task *dmt, const char *uuid)
+{
+	if (dmt->uuid) {
+		free(dmt->uuid);
+		dmt->uuid = NULL;
+	}
+
+	if (!(dmt->uuid = strdup(uuid))) {
+		log_error("dm_task_set_uuid: strdup(%s) failed", uuid);
+		return 0;
+	}
+
+	return 1;
+}
+
 int dm_task_set_minor(struct dm_task *dmt, int minor)
 {
         dmt->minor = minor;

tools/dmsetup.c

@@ -89,7 +89,7 @@ static int _parse_file(struct dm_task *dmt, const char *file)
 	return r;
 }
 
-static int _load(int task, const char *name, const char *file)
+static int _load(int task, const char *name, const char *file, const char *uuid)
 {
 	int r = 0;
 	struct dm_task *dmt;
@@ -100,6 +100,9 @@ static int _load(int task, const char *name, const char *file)
 	if (!dm_task_set_name(dmt, name))
 		goto out;
 
+	if (uuid && !dm_task_set_uuid(dmt, uuid))
+		goto out;
+
 	if (!_parse_file(dmt, file))
 		goto out;
 
@@ -122,12 +125,12 @@ static int _load(int task, const char *name, const char *file)
 
 static int _create(int argc, char **argv)
 {
-	return _load(DM_DEVICE_CREATE, argv[1], argv[2]);
+	return _load(DM_DEVICE_CREATE, argv[1], argv[2], argv[3]);
 }
 
 static int _reload(int argc, char **argv)
 {
-	return _load(DM_DEVICE_RELOAD, argv[1], argv[2]);
+	return _load(DM_DEVICE_RELOAD, argv[1], argv[2], NULL);
 }
 
 static int _rename(int argc, char **argv)
@@ -321,22 +324,23 @@ typedef int (*command_fn) (int argc, char **argv);
 struct command {
 	char *name;
 	char *help;
-	int num_args;
+	int min_args;
+	int max_args;
 	command_fn fn;
 };
 
 static struct command _commands[] = {
-	{"create", "<dev_name> <table_file>", 2, _create},
+	{"create", "<dev_name> <table_file> [<uuid>]", 2, 3, _create},
-	{"remove", "<dev_name>", 1, _remove},
+	{"remove", "<dev_name>", 1, 1, _remove},
-	{"remove_all", "", 0, _remove_all},
+	{"remove_all", "", 0, 0, _remove_all},
-	{"suspend", "<dev_name>", 1, _suspend},
+	{"suspend", "<dev_name>", 1, 1, _suspend},
-	{"resume", "<dev_name>", 1, _resume},
+	{"resume", "<dev_name>", 1, 1, _resume},
-	{"reload", "<dev_name> <table_file>", 2, _reload},
+	{"reload", "<dev_name> <table_file>", 2, 2, _reload},
-	{"info", "<dev_name>", 1, _info},
+	{"info", "<dev_name>", 1, 1, _info},
-	{"deps", "<dev_name>", 1, _deps},
+	{"deps", "<dev_name>", 1, 1, _deps},
-	{"rename", "<dev_name> <new_name>", 2, _rename},
+	{"rename", "<dev_name> <new_name>", 2, 2, _rename},
-	{"version", "", 0, _version},
+	{"version", "", 0, 0, _version},
-	{NULL, NULL, 0, NULL}
+	{NULL, NULL, 0, 0, NULL}
 };
 
 static void _usage(FILE * out)
@@ -412,7 +416,7 @@ int main(int argc, char **argv)
 		exit(1);
 	}
 
-	if (argc != c->num_args + 1) {
+	if (argc < c->min_args + 1 || argc > c->max_args + 1) {
 		fprintf(stderr, "Incorrect number of arguments\n");
 		_usage(stderr);
 		exit(1);