From: Petr Uzel <petr.uzel@suse.cz>
Subject: libparted: Make BLKRRPART more robust
Patch-mainline: no, upstream does not use BLKRRPART and leaves DASDs broken
---
 libparted/arch/linux.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

Index: parted-3.3/libparted/arch/linux.c
===================================================================
--- parted-3.3.orig/libparted/arch/linux.c
+++ parted-3.3/libparted/arch/linux.c
@@ -39,6 +39,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/utsname.h>        /* for uname() */
+#include <sys/file.h>
 #include <scsi/scsi.h>
 #include <assert.h>
 #include <sys/sysmacros.h>
@@ -3242,14 +3243,15 @@ static int
 _kernel_reread_part_table (PedDevice* dev)
 {
         LinuxSpecific*  arch_specific = LINUX_SPECIFIC (dev);
-        int             retry_count = 9;
+        int             retry_count = 5;
 
         sync();
+	flock(arch_specific->fd, LOCK_EX);
         while (ioctl (arch_specific->fd, BLKRRPART)) {
                 retry_count--;
                 sync();
-                if (retry_count == 3)
-                        sleep(1); /* Pause to allow system to settle */
+
+		sleep(1); /* Pause to allow system to settle */
 
                 if (!retry_count) {
                         ped_exception_throw (
@@ -3259,10 +3261,12 @@ _kernel_reread_part_table (PedDevice* de
                           "table on %s (%s).  As a result, it may not "
                           "reflect all of your changes until after reboot."),
                                 dev->path, strerror (errno));
+			flock(arch_specific->fd, LOCK_UN);
                         return 0;
                 }
         }
 
+	flock(arch_specific->fd, LOCK_UN);
         return 1;
 }