based on upstream patch:

	commit 55113b15afe5f61fc917c22a9d8d47f89b37c757
	Author: M.S.Colclough <m.s.colclough@bham.ac.uk>
	Date:   Wed Mar 31 18:11:00 2010 +0200

	    libblkid: avoid probing CDs for RAID
	    
	    RAID probing of CD/DVD can yield errors because of well-known problem
	    in reading the end of the disk with some disk/drive combinations.
	    Borrow CD detection method from udev and skip the RAID tests for
	    these devices.
	    
	    [kzak@redhat.com: - check for linux/cdrom.h in ./configure
			      - add #ifdef around the ioctl call
			      - call the ioctl for block devices only]
	    
	    Signed-off-by: Mark Colclough <m.s.colclough@bham.ac.uk>
	    Signed-off-by: Karel Zak <kzak@redhat.com>


---
 shlibs/blkid/src/blkidP.h                  |    2 ++
 shlibs/blkid/src/probe.c                   |   14 ++++++++++++++
 shlibs/blkid/src/superblocks/superblocks.c |    5 +++++
 3 files changed, 21 insertions(+)

--- util-linux-ng-2.17.2.orig/shlibs/blkid/src/blkidP.h
+++ util-linux-ng-2.17.2/shlibs/blkid/src/blkidP.h
@@ -209,6 +209,7 @@ struct blkid_struct_probe
 /* flags */
 #define BLKID_PRIVATE_FD	(1 << 1)	/* see blkid_new_probe_from_filename() */
 #define BLKID_TINY_DEV		(1 << 2)	/* <= 1.47MiB (floppy or so) */
+#define BLKID_CDROM_DEV		(1 << 3)	/* is a CD/DVD drive */
 
 /*
  * Evaluation methods (for blkid_eval_* API)
@@ -363,6 +364,7 @@ extern void blkid_free_dev(blkid_dev dev
 
 /* probe.c */
 extern int blkid_probe_is_tiny(blkid_probe pr);
+extern int blkid_probe_is_cdrom(blkid_probe pr);
 extern unsigned char *blkid_probe_get_buffer(blkid_probe pr,
                                 blkid_loff_t off, blkid_loff_t len);
 
--- util-linux-ng-2.17.2.orig/shlibs/blkid/src/probe.c
+++ util-linux-ng-2.17.2/shlibs/blkid/src/probe.c
@@ -77,6 +77,7 @@
 #include <fcntl.h>
 #include <ctype.h>
 #include <sys/types.h>
+#include <linux/cdrom.h>
 #ifdef HAVE_SYS_STAT_H
 #include <sys/stat.h>
 #endif
@@ -545,6 +546,14 @@ int blkid_probe_is_tiny(blkid_probe pr)
 	return pr && (pr->flags & BLKID_TINY_DEV);
 }
 
+/*
+ * CDROMs may fail when probed for RAID (last sector problem)
+ */
+int blkid_probe_is_cdrom(blkid_probe pr)
+{
+	return pr && (pr->flags & BLKID_CDROM_DEV);
+}
+
 /**
  * blkid_probe_set_device:
  * @pr: probe
@@ -570,6 +579,7 @@ int blkid_probe_set_device(blkid_probe p
 
 	pr->flags &= ~BLKID_PRIVATE_FD;
 	pr->flags &= ~BLKID_TINY_DEV;
+	pr->flags &= ~BLKID_CDROM_DEV;
 	pr->fd = fd;
 	pr->off = off;
 	pr->size = 0;
@@ -615,6 +625,10 @@ int blkid_probe_set_device(blkid_probe p
 	if (pr->size <= 1440 * 1024 && !S_ISCHR(pr->mode))
 		pr->flags |= BLKID_TINY_DEV;
 
+#ifdef CDROM_GET_CAPABILITY
+	if (S_ISBLK(pr->mode) && ioctl(fd, CDROM_GET_CAPABILITY, NULL) >= 0)
+		pr->flags |= BLKID_CDROM_DEV;
+#endif
 	return 0;
 err:
 	DBG(DEBUG_LOWPROBE,
--- util-linux-ng-2.17.2.orig/shlibs/blkid/src/superblocks/superblocks.c
+++ util-linux-ng-2.17.2/shlibs/blkid/src/superblocks/superblocks.c
@@ -342,6 +342,11 @@ static int superblocks_probe(blkid_probe
 		    blkid_probe_is_tiny(pr))
 			continue;
 
+		/* don't probe for RAIDs, swap or journal on floppies or CD/DVDs */
+		if ((id->usage & (BLKID_USAGE_RAID | BLKID_USAGE_OTHER)) &&
+		    (blkid_probe_is_tiny(pr) || blkid_probe_is_cdrom(pr)))
+			continue;
+
 		DBG(DEBUG_LOWPROBE, printf("[%d] %s:\n", i, id->name));
 
 		/* try to detect by magic string */