$NetBSD$

--- libntfs-3g/device.c.orig	2016-02-22 07:34:33.000000000 +0000
+++ libntfs-3g/device.c	2016-09-11 16:02:26.312141785 +0000
@@ -95,6 +95,10 @@
 #	define BLKBSZSET _IOW(0x12,113,size_t) /* Set device block size in bytes. */
 #endif
 
+#if defined(__NetBSD__)
+#include <sys/disklabel.h> /* XXX autoconf this ? */
+#endif
+
 /**
  * ntfs_device_alloc - allocate an ntfs device structure and pre-initialize it
  * @name:	name of the device (must be present)
@@ -596,6 +600,24 @@
 		}
 	}
 #endif
+#ifdef DIOCGPART
+	{
+	    struct stat st;
+	    if (dev->d_ops->stat(dev, &st) >= 0) {
+		    struct disklabel disklabel;
+		    int secsize;
+		    s64 psize;
+		    if (dev->d_ops->ioctl(dev, DIOCGDINFO, &disklabel) >= 0) {
+			    secsize = disklabel.d_secsize;
+			    psize = disklabel.d_partitions[DISKPART(st.st_rdev)].p_size;
+			    ntfs_log_debug("DIOCGPART nr %d byte blocks = %lld (0x%llx)\n",
+					    secsize, psize, psize);
+			    return psize * secsize / blocksize;
+		    }
+	    }
+	}
+#endif
+
 	/*
 	 * We couldn't figure it out by using a specialized ioctl,
 	 * so do binary search to find the size of the device.