From: NeilBrown <neilb@suse.de>
Date: Mon, 31 Jan 2011 03:49:39 +0000 (+1100)
Subject: open_mddev: open RDONLY if RDWR doesn't work.
X-Git-Tag: mdadm-3.2~26
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c3f26510c6b2a9b634fd417e7fa3d4bf9674dd28;p=thirdparty%2Fmdadm.git

open_mddev: open RDONLY if RDWR doesn't work.

If an array is read-only then "mdadm -S"
cannot open it to stop it without this fix.

Signed-off-by: NeilBrown <neilb@suse.de>
---

diff --git a/mdopen.c b/mdopen.c
index 21baf5da..0a174211 100644
--- a/mdopen.c
+++ b/mdopen.c
@@ -390,6 +390,8 @@ int create_mddev(char *dev, char *name, int autof, int trustworthy,
 int open_mddev(char *dev, int report_errors)
 {
 	int mdfd = open(dev, O_RDWR);
+	if (mdfd < 0 && errno == EACCES)
+		mdfd = open(dev, O_RDONLY);
 	if (mdfd < 0) {
 		if (report_errors)
 			fprintf(stderr, Name ": error opening %s: %s\n",