File 0051-IncRemove-Set-auto-read-only-after-successful-excl-o.patch of Package mdadm.5365

From 4d149ab5178e21422a9bdb9a5489ed3381a0d136 Mon Sep 17 00:00:00 2001
From: Pawel Baldysiak <pawel.baldysiak@intel.com>
Date: Fri, 27 Feb 2015 15:47:54 +0100
Subject: [PATCH 064/359] IncRemove: Set "auto-read" only after successful excl
 open.
References: bsc#1081910

"mdadm -If" - triggered from udev rules when disk is removed from OS -
tries to set array in auto-read-only mode. This can interrupt rebuild
process which is started automatically, e.g. if array is mounted and
spare disk is available (I/O error is detected faster than removing
failed disk by mdadm).
This patch prevents "mdadm -If" from setting array into "auto-read-only",
by requiring exclusive open to succeed.

Signed-off-by: Pawel Baldysiak <pawel.baldysiak@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Coly Li <colyli@suse.de>

---
 Incremental.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/Incremental.c b/Incremental.c
index 33c0d7f..0c9a9a4 100644
--- a/Incremental.c
+++ b/Incremental.c
@@ -1712,12 +1712,16 @@ int IncrementalRemove(char *devname, char *id_path, int verbose)
 		return 1;
 	}
 	sysfs_init(&mdi, -1, ent->devnm);
-	if (sysfs_get_str(&mdi, NULL, "array_state",
-			  buf, sizeof(buf)) > 0) {
-		if (strncmp(buf, "active", 6) == 0 ||
-		    strncmp(buf, "clean", 5) == 0)
-			sysfs_set_str(&mdi, NULL,
-				      "array_state", "read-auto");
+	mdfd = open_dev_excl(ent->devnm);
+	if (mdfd > 0) {
+		close(mdfd);
+		if (sysfs_get_str(&mdi, NULL, "array_state",
+				  buf, sizeof(buf)) > 0) {
+			if (strncmp(buf, "active", 6) == 0 ||
+			    strncmp(buf, "clean", 5) == 0)
+				sysfs_set_str(&mdi, NULL,
+					      "array_state", "read-auto");
+		}
 	}
 	mdfd = open_dev(ent->devnm);
 	if (mdfd < 0) {
-- 
2.16.1