s390-tools/s390-tools-sles15sp3-dasdfmt-retry-BIODASDINFO-if-device-is-busy.patch

From 943e577440d74ad7f8787af2590c8ab4579a459b Mon Sep 17 00:00:00 2001
From: Hannes Reinecke <hare@suse.de>
Date: Thu, 5 Nov 2015 10:57:38 +0100
Subject: [PATCH] dasdfmt: retry BIODASDINFO if device is busy

Modern udev have the wonderful 'feature' to sending a 'change'
event whenever a device opened with O_RDWR is closed again.
The reasoning is that the said program _might_ have changed
the partition table and hence we _might_ have missed a partition
update.
But in doing so it not only generated tons of pointless events
but also confused the hell out of other programs.
Idiots.

References: bsc#937340

Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 dasdfmt/dasdfmt.c |   19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

--- a/dasdfmt/dasdfmt.c
+++ b/dasdfmt/dasdfmt.c
@@ -621,7 +621,7 @@
  */
 static void check_disk(void)
 {
-	int err;
+	int err, index = 0 ;
 	bool ro;
 
 	err = dasd_is_ro(g.dev_node, &ro);
@@ -631,6 +631,23 @@
 	if (ro)
 		error("Disk %s is read only!", g.dev_path);
 	if (!g.force) {
+		/*
+		 * udev strikes again.
+		 * Modern udev will issue a 'change' event whenever
+		 * a device opened with O_RDWR is closed again.
+		 * On the grounds that program _might_ have changed
+		 * the partition table.
+		 * And confusing the hell out ouf anyone else.
+		 * Bah.
+		*/
+		for ( index = 0 ; index < 6 ; index++ ) {
+			if (g.dasd_info.open_count > 1) {
+				dasd_get_info(g.dev_node, &g.dasd_info);
+				sleep(1);
+			}
+			else break;
+
+		}
 		if (g.dasd_info.open_count > 1)
 			error("Disk %s is in use!", g.dev_path);
 	}