New version

- Prevent issues between libparted and udev (vpodzime)

libblockdev.spec

@@ -1,6 +1,6 @@
 Name:        libblockdev
 Version:     1.9
-Release:     5%{?dist}
+Release:     6%{?dist}
 Summary:     A library for low-level manipulation with block devices
 License:     LGPLv2+
 URL:         https://github.com/rhinstaller/libblockdev
@@ -13,6 +13,7 @@ Patch3: mdadm_examine_export.patch
 Patch4: mdadm_examine_uuid.patch
 Patch5: mdadm_fw_raid_device.patch
 Patch6: obj_path_signatures.patch
+Patch7: parted_udev_issues.patch
 
 BuildRequires: glib2-devel
 BuildRequires: gobject-introspection-devel
@@ -390,6 +391,7 @@ A meta-package that pulls all the libblockdev plugins as dependencies.
 %patch4 -p1
 %patch5 -p1
 %patch6 -p1
+%patch7 -p1
 
 %build
 %configure
@@ -587,6 +589,9 @@ find %{buildroot} -type f -name "*.la" | xargs %{__rm}
 %files plugins-all
 
 %changelog
+* Mon Oct 24 2016 Vratislav Podzimek <vpodzime@redhat.com> - 1.9-6
+- Prevent issues between libparted and udev (vpodzime)
+
 * Mon Oct 10 2016 Vratislav Podzimek <vpodzime@redhat.com> - 1.9-5
 - Make sure all object paths are passed and extracted as such (vpodzime)
   Resolves: rhbz#1374973

parted_udev_issues.patch

@@ -0,0 +1,76 @@
+From 66ceb82b6d51707a74174dfb7a74b943ea571a43 Mon Sep 17 00:00:00 2001
+From: Vratislav Podzimek <vpodzime@redhat.com>
+Date: Thu, 20 Oct 2016 15:43:23 +0200
+Subject: [PATCH] Prevent issues between libparted and udev
+
+libparted does committing of a new partition table to disk in two steps:
+
+1. committing (writing and flushing) to disk and
+2. telling OS about the partitions.
+
+However, that means that if things go wrong, udev may step in between the above
+steps and trigger events when the block device file is closed (from being opened
+RW) that could lead to a failure of the second step because some other process
+may open the block device file in the reaction to the event.
+
+In order to prevent such issues we need to acquire an exclusive lock on the
+block device file, which prevents udev from triggering events, for the time we
+let libparted perform the two operations above.
+
+(cherry picked from commit 0a65466154994759cbec15ce984b751b073a891f)
+Signed-off-by: Vratislav Podzimek <vpodzime@redhat.com>
+---
+ src/plugins/part.c | 15 +++++++++++++++
+ 1 file changed, 15 insertions(+)
+
+diff --git a/src/plugins/part.c b/src/plugins/part.c
+index 4634ef8..d5239e3 100644
+--- a/src/plugins/part.c
++++ b/src/plugins/part.c
+@@ -23,6 +23,8 @@
+ #include <stdlib.h>
+ #include <math.h>
+ #include <inttypes.h>
++#include <unistd.h>
++#include <sys/file.h>
+ #include <utils.h>
+ 
+ #include "part.h"
+@@ -150,11 +152,22 @@ static const gchar *table_type_str[BD_PART_TABLE_UNDEF] = {"msdos", "gpt"};
+ 
+ static gboolean disk_commit (PedDisk *disk, gchar *path, GError **error) {
+     gint ret = 0;
++    gint dev_fd = 0;
++
++    /* XXX: try to grab an exclusive lock for the device so that udev doesn't
++       trigger events for it in between the two operations we need to perform
++       (see below) */
++    dev_fd = open (disk->dev->path, O_RDONLY|O_CLOEXEC);
++    if (dev_fd >= 0)
++        /* if this fails, we can do no better anyway, so just ignore the return
++           value */
++        flock (dev_fd, LOCK_EX);
+ 
+     ret = ped_disk_commit_to_dev (disk);
+     if (ret == 0) {
+         set_parted_error (error, BD_PART_ERROR_FAIL);
+         g_prefix_error (error, "Failed to commit changes to device '%s'", path);
++        close (dev_fd);
+         return FALSE;
+     }
+ 
+@@ -162,9 +175,11 @@ static gboolean disk_commit (PedDisk *disk, gchar *path, GError **error) {
+     if (ret == 0) {
+         set_parted_error (error, BD_PART_ERROR_FAIL);
+         g_prefix_error (error, "Failed to inform OS about changes on the '%s' device", path);
++        close (dev_fd);
+         return FALSE;
+     }
+ 
++    close (dev_fd);
+     return TRUE;
+ }
+ 
+-- 
+2.7.4
+