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Diffstat (limited to 'extras/multipath/devmap_name.c')
-rw-r--r--extras/multipath/devmap_name.c60
1 files changed, 60 insertions, 0 deletions
diff --git a/extras/multipath/devmap_name.c b/extras/multipath/devmap_name.c
new file mode 100644
index 0000000000..08e526e072
--- /dev/null
+++ b/extras/multipath/devmap_name.c
@@ -0,0 +1,60 @@
+#include "libdevmapper/libdevmapper.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <linux/kdev_t.h>
+
+static void usage(char * progname) {
+ fprintf(stderr, "usage : %s major minor\n", progname);
+ exit(1);
+}
+
+int main(int argc, char **argv)
+{
+ int r = 0;
+ struct dm_names *names;
+ unsigned next = 0;
+ int major, minor;
+
+ /* sanity check */
+ if (argc != 3)
+ usage(argv[0]);
+
+ major = atoi(argv[1]);
+ minor = atoi(argv[2]);
+
+ struct dm_task *dmt;
+
+ if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
+ return 0;
+
+ if (!dm_task_run(dmt))
+ goto out;
+
+ if (!(names = dm_task_get_names(dmt)))
+ goto out;
+
+ if (!names->dev) {
+ printf("No devices found\n");
+ goto out;
+ }
+
+ do {
+ names = (void *) names + next;
+ if ((int) MAJOR(names->dev) == major &&
+ (int) MINOR(names->dev) == minor) {
+ printf("%s\n", names->name);
+ goto out;
+ }
+ next = names->next;
+ } while (next);
+
+ /* No correspondance found */
+ r = 1;
+
+ out:
+ dm_task_destroy(dmt);
+ return r;
+}
+