IMSM/DDF: don't recognised these metadata on partitions.

[thirdparty/mdadm.git] / util.c

diff --git a/util.c b/util.c
index 79d2b0fecdb58077143bca5f8d2f6b2604110b7d..25f1e56ae01d05277765ef6c4779ac08d6a11f75 100644 (file)
--- a/util.c
+++ b/util.c
@@ -302,6 +302,31 @@ void remove_partitions(int fd)
 #endif
 }
 
+int test_partition(int fd)
+{
+       /* Check if fd is a whole-disk or a partition.
+        * BLKPG will return EINVAL on a partition, and BLKPG_DEL_PARTITION
+        * will return ENXIO on an invalid partition number.
+        */
+       struct blkpg_ioctl_arg a;
+       struct blkpg_partition p;
+       a.op = BLKPG_DEL_PARTITION;
+       a.data = (void*)&p;
+       a.datalen = sizeof(p);
+       a.flags = 0;
+       memset(a.data, 0, a.datalen);
+       p.pno = 1<<30;
+       if (ioctl(fd, BLKPG, &a) == 0)
+               /* Very unlikely, but not a partition */
+               return 0;
+       if (errno == ENXIO)
+               /* not a partition */
+               return 0;
+
+       return 1;
+}
+
+
 int enough(int level, int raid_disks, int layout, int clean,
           char *avail, int avail_disks)
 {