File libparted-use-BLKRRPART-only-when-needed.patch of Package parted.15765

From: Sebastian Parschauer <sparschauer@suse.de>
Date: Thu, 25 Jan 2018 17:06:00 +0100
Subject: libparted: dasd: Use BLKRRPART only when needed
References: bsc#1065197, bsc#1067435
Patch-mainline: no, upstream dropped proper DASD support

The BLKRRPART ioctl is required due to limitations of the DASD
disk layout. We use it always for those devices right now but when
adding or removing a partition at the end, then it is enough to use
the BLKPG* ioctls. The problem with BLKRRPART occurs when one of the
first partitions is busy. BLKRRPART touches all partitions and the
parted command fails in this case.
So detect that situation and use BLKRRPART only when needed instead.

Signed-off-by: Sebastian Parschauer <sparschauer@suse.de>
---
 include/parted/disk.in.h |  1 +
 libparted/arch/linux.c   | 13 +++++++------
 libparted/disk.c         | 15 +++++++++++++--
 3 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/include/parted/disk.in.h b/include/parted/disk.in.h
index b42e7cf..ac57d68 100644
--- a/include/parted/disk.in.h
+++ b/include/parted/disk.in.h
@@ -195,6 +195,7 @@ struct _PedDisk {
         int                 update_mode;        /**< mode without free/metadata
                                                    partitions, for easier
                                                    update */
+        int                 needs_blkrrpart;    /* special cases on DASDs */
 };
 
 struct _PedDiskOps {
diff --git a/libparted/arch/linux.c b/libparted/arch/linux.c
index 461c095..d7d37e7 100644
--- a/libparted/arch/linux.c
+++ b/libparted/arch/linux.c
@@ -3264,14 +3264,15 @@ static int
 linux_disk_commit (PedDisk* disk)
 {
         if (disk->dev->type != PED_DEVICE_FILE) {
-                /* 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.
+                /* If adding or removing partitions not at the end, then 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)
+		if (disk->dev->type == PED_DEVICE_DASD && disk->needs_blkrrpart)
 		       return _kernel_reread_part_table(disk->dev);
 
 		assert(_have_blkpg());
diff --git a/libparted/disk.c b/libparted/disk.c
index 18cee12..03f8548 100644
--- a/libparted/disk.c
+++ b/libparted/disk.c
@@ -406,6 +406,7 @@ _ped_disk_alloc (const PedDevice* dev, const PedDiskType* disk_type)
 	disk->update_mode = 1;
 	disk->part_list = NULL;
 	disk->needs_clobber = 0;
+	disk->needs_blkrrpart = 0;
 	return disk;
 
 error:
@@ -1733,8 +1734,12 @@ _disk_raw_remove (PedDisk* disk, PedPartition* part)
 
 	if (part->prev) {
 		part->prev->next = part->next;
-		if (part->next)
+		if (part->next) {
+			/* remove partition in the middle */
+			if (part->type == PED_PARTITION_NORMAL)
+				disk->needs_blkrrpart = 1;
 			part->next->prev = part->prev;
+		}
 	} else {
 		if (part->type & PED_PARTITION_LOGICAL) {
 			ped_disk_extended_partition (disk)->part_list
@@ -1742,8 +1747,12 @@ _disk_raw_remove (PedDisk* disk, PedPartition* part)
 		} else {
 			disk->part_list = part->next;
 		}
-		if (part->next)
+		if (part->next) {
+			/* remove first partition */
+			if (part->type == PED_PARTITION_NORMAL)
+				disk->needs_blkrrpart = 1;
 			part->next->prev = NULL;
+		}
 	}
 
 	return 1;
@@ -1773,6 +1782,8 @@ _disk_raw_add (PedDisk* disk, PedPartition* part)
 	}
 
 	if (walk) {
+		if (part->type == PED_PARTITION_NORMAL)
+			disk->needs_blkrrpart = 1;
 		return _disk_raw_insert_before (disk, walk, part);
 	} else {
 		if (last) {
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