Userspace support for LIST_VERSIONS ioctl.

libdm/.export.sym

@@ -12,6 +12,7 @@ Base {
 		dm_task_get_deps;
 		dm_task_get_name;
 		dm_task_get_names;
+		dm_task_get_versions;
 		dm_task_get_uuid;
 		dm_task_set_ro;
 		dm_task_set_newname;

libdm/ioctl/libdevmapper.c

@@ -80,6 +80,7 @@ static struct cmd_data _cmd_data_v4[] = {
 	{"names",	DM_LIST_DEVICES,	{4, 0, 0}},
 	{"clear",	DM_TABLE_CLEAR,		{4, 0, 0}},
 	{"mknodes",	DM_DEV_STATUS,		{4, 0, 0}},
+	{"versions",	DM_LIST_VERSIONS,	{4, 1, 0}},
 };
 /* *INDENT-ON* */
 
@@ -384,6 +385,10 @@ static int _dm_names_v1(struct dm_ioctl_v1 *dmi)
 	struct stat buf;
 	char path[PATH_MAX];
 
+	log_print("Warning: Device list may be incomplete with interface "
+		  "version 1.");
+	log_print("Please upgrade your kernel device-mapper driver.");
+
 	if (!(d = opendir(dev_dir))) {
 		log_error("%s: opendir failed: %s", dev_dir, strerror(errno));
 		return 0;
@@ -736,6 +741,12 @@ struct dm_names *dm_task_get_names(struct dm_task *dmt)
 				    dmt->dmi.v4->data_start);
 }
 
+struct dm_versions *dm_task_get_versions(struct dm_task *dmt)
+{
+	return (struct dm_versions *) (((void *) dmt->dmi.v4) +
+				       dmt->dmi.v4->data_start);
+}
+
 int dm_task_set_ro(struct dm_task *dmt)
 {
 	dmt->read_only = 1;

libdm/ioctl/libdm-compat.h

@@ -105,6 +105,7 @@ static struct cmd_data _cmd_data_v1[] = {
 	{ "names",	0,			{4, 0, 0} },
 	{ "clear",	0,			{4, 0, 0} },
 	{ "mknodes",	0,			{4, 0, 0} },
+	{ "versions",	0,			{4, 1, 0} },
 };
 /* *INDENT-ON* */
 

libdm/libdevmapper.h

@@ -57,7 +57,9 @@ enum {
 
 	DM_DEVICE_CLEAR,
 
-	DM_DEVICE_MKNODES
+	DM_DEVICE_MKNODES,
+
+	DM_DEVICE_LIST_VERSIONS
 };
 
 struct dm_task;
@@ -97,6 +99,13 @@ struct dm_names {
 	char name[0];
 };
 
+struct dm_versions {
+        uint32_t next;		/* Offset to next struct from start of this struct */
+        uint32_t version[3];
+
+        char name[0];
+};
+
 int dm_get_library_version(char *version, size_t size);
 int dm_task_get_driver_version(struct dm_task *dmt, char *version, size_t size);
 int dm_task_get_info(struct dm_task *dmt, struct dm_info *dmi);
@@ -105,6 +114,7 @@ const char *dm_task_get_uuid(struct dm_task *dmt);
 
 struct dm_deps *dm_task_get_deps(struct dm_task *dmt);
 struct dm_names *dm_task_get_names(struct dm_task *dmt);
+struct dm_versions *dm_task_get_versions(struct dm_task *dmt);
 
 int dm_task_set_ro(struct dm_task *dmt);
 int dm_task_set_newname(struct dm_task *dmt, const char *newname);

tools/dmsetup.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2001 Sistina Software (UK) Limited.
+ * Copyright (C) 2001-2003 Sistina Software (UK) Limited.
  *
  * This file is released under the GPL.
  */
@@ -462,6 +462,40 @@ static int _status(int argc, char **argv, void *data)
 
 }
 
+/* Show target names and their version numbers */
+static int _targets(int argc, char **argv, void *data)
+{
+	int r = 0;
+	struct dm_task *dmt;
+	struct dm_versions *target;
+	struct dm_versions *last_target;
+
+	if (!(dmt = dm_task_create(DM_DEVICE_LIST_VERSIONS)))
+		return 0;
+
+	if (!dm_task_run(dmt))
+		goto out;
+
+	target = dm_task_get_versions(dmt);
+
+	/* Fetch targets and print 'em */
+	do {
+		last_target = target;
+
+		printf("%-16s v%d.%d.%d\n", target->name, target->version[0],
+		       target->version[1], target->version[2]);
+
+		target = (void *) target + target->next;
+	} while (last_target != target);
+
+	r = 1;
+
+      out:
+	dm_task_destroy(dmt);
+	return r;
+
+}
+
 static int _info(int argc, char **argv, void *data)
 {
 	int r = 0;
@@ -611,6 +645,7 @@ static struct command _commands[] = {
 	{"status", "[<dev_name>]", 0, 1, _status},
 	{"table", "[<dev_name>]", 0, 1, _status},
 	{"wait", "<dev_name> [<event_nr>]", 1, 2, _wait},
+	{"targets", "", 0, 0, _targets},
 	{"version", "", 0, 0, _version},
 	{NULL, NULL, 0, 0, NULL}
 };