diff -u util-linux-2.20.1/debian/changelog util-linux-2.20.1/debian/changelog
--- util-linux-2.20.1/debian/changelog
+++ util-linux-2.20.1/debian/changelog
@@ -1,3 +1,10 @@
+util-linux (2.20.1-5.1ubuntu20.2) trusty; urgency=medium
+
+  * Backport of 569d1dac to fix invalid ioctl when blockdev is called against
+    loopback devices. (LP: #1174098)
+
+ -- Chris J Arges <chris.j.arges@canonical.com>  Mon, 22 Sep 2014 15:21:59 -0500
+
 util-linux (2.20.1-5.1ubuntu20.1) trusty-proposed; urgency=medium
 
   * fstrim-all: Fix typo that made unwanted stderr output from hdparm appear.
only in patch2:
unchanged:
--- util-linux-2.20.1.orig/disk-utils/Makefile.am
+++ util-linux-2.20.1/disk-utils/Makefile.am
@@ -36,7 +36,7 @@
 dist_man_MANS += fdformat.8 blockdev.8
 sbin_PROGRAMS += blockdev
 usrsbin_exec_PROGRAMS += fdformat
-blockdev_SOURCES = blockdev.c $(utils_common)
+blockdev_SOURCES = blockdev.c $(top_srcdir)/lib/sysfs.c $(top_srcdir)/lib/at.c $(utils_common)
 endif
 
 if BUILD_LIBBLKID
only in patch2:
unchanged:
--- util-linux-2.20.1.orig/disk-utils/blockdev.c
+++ util-linux-2.20.1/disk-utils/blockdev.c
@@ -15,6 +15,7 @@
 #include "nls.h"
 #include "blkdev.h"
 #include "pathnames.h"
+#include "sysfs.h"
 
 struct bdc {
 	long		ioc;		/* ioctl code */
@@ -435,7 +436,9 @@
 	int ro, ssz, bsz;
 	long ra;
 	unsigned long long bytes;
-	struct hd_geometry g;
+	uint64_t start = 0;
+	struct sysfs_cxt cxt;
+	struct stat st;
 
 	fd = open(device, O_RDONLY | O_NONBLOCK);
 	if (fd < 0) {
@@ -445,15 +448,22 @@
 	}
 
 	ro = ssz = bsz = 0;
-	g.start = ra = 0;
+	ra = 0;
+	if (fstat(fd, &st) == 0) {
+		if (sysfs_init(&cxt, st.st_rdev, NULL))
+			err(EXIT_FAILURE,
+				_("%s: failed to initialize sysfs handler"),
+				device);
+		sysfs_read_u64(&cxt, "start", &start);
+		sysfs_deinit(&cxt);
+	}
 	if (ioctl(fd, BLKROGET, &ro) == 0 &&
 	    ioctl(fd, BLKRAGET, &ra) == 0 &&
 	    ioctl(fd, BLKSSZGET, &ssz) == 0 &&
 	    ioctl(fd, BLKBSZGET, &bsz) == 0 &&
-	    ioctl(fd, HDIO_GETGEO, &g) == 0 &&
 	    blkdev_get_size(fd, &bytes) == 0) {
-		printf("%s %5ld %5d %5d %10ld %15lld   %s\n",
-		       ro ? "ro" : "rw", ra, ssz, bsz, g.start, bytes, device);
+		printf("%s %5ld %5d %5d %10ju %15lld   %s\n",
+		       ro ? "ro" : "rw", ra, ssz, bsz, start, bytes, device);
 	} else {
 		if (!quiet)
 			warnx(_("ioctl error on %s"), device);