parted/libparted-use-BLKRRPART-for-DASD.patch.patch

From: Petr Uzel <petr.uzel@suse.cz>
Date: Fri, 14 Feb 2014 09:12:47 +0100
Subject: libparted: use BLKRRPART for DASDs
References: bnc#862139
Patch-mainline: no, upstream dropped proper DASD support

This reverts upstream commit 9fa0e1800db5b9f094ae481fd95a51da03f19e95.
This reverts upstream commit 1223b9fc07859cb619c80dc057bd05458f9b5669.
and some fixups on top
---
 libparted/arch/linux.c |   50 ++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 41 insertions(+), 9 deletions(-)

Index: parted-3.3/libparted/arch/linux.c
===================================================================
--- parted-3.3.orig/libparted/arch/linux.c
+++ parted-3.3/libparted/arch/linux.c
@@ -3239,6 +3239,34 @@ _disk_sync_part_table (PedDisk* disk)
 }
 
 static int
+_kernel_reread_part_table (PedDevice* dev)
+{
+        LinuxSpecific*  arch_specific = LINUX_SPECIFIC (dev);
+        int             retry_count = 9;
+
+        sync();
+        while (ioctl (arch_specific->fd, BLKRRPART)) {
+                retry_count--;
+                sync();
+                if (retry_count == 3)
+                        sleep(1); /* Pause to allow system to settle */
+
+                if (!retry_count) {
+                        ped_exception_throw (
+                                PED_EXCEPTION_WARNING,
+                                PED_EXCEPTION_IGNORE,
+                        _("WARNING: the kernel failed to re-read the partition "
+                          "table on %s (%s).  As a result, it may not "
+                          "reflect all of your changes until after reboot."),
+                                dev->path, strerror (errno));
+                        return 0;
+                }
+        }
+
+        return 1;
+}
+
+static int
 _have_blkpg ()
 {
         static int have_blkpg = -1;
@@ -3257,14 +3285,19 @@ linux_disk_commit (PedDisk* disk)
 {
         if (disk->dev->type != PED_DEVICE_FILE) {
 
-                /* We now require BLKPG support.  If this assertion fails,
-                   please write to the mailing list describing your system.
-                   Assuming it's never triggered, ...
-                   FIXME: remove this assertion in 2012.  */
-                assert (_have_blkpg ());
-
-                if (!_disk_sync_part_table (disk))
-                        return 0;
+                /* The ioctl() command BLKPG_ADD_PARTITION does not notify
+                 * the devfs system; consequently, /proc/partitions will not
+                 * be up to date, and the proper links in /dev are not
+                 * created.  Therefore, if using DevFS, we must get the kernel
+                 * to re-read and grok the partition table.
+                 */
+                /* Work around kernel dasd problem so we really do BLKRRPART */
+               if (disk->dev->type == PED_DEVICE_DASD)
+                      return _kernel_reread_part_table(disk->dev);
+
+               assert(_have_blkpg());
+               if (!_disk_sync_part_table(disk))
+                      return 0;
         }
 
         return 1;