From eba4a485b224ae259700b960fe63abf2463a33aa Mon Sep 17 00:00:00 2001
From: mav <mav@FreeBSD.org>
Date: Tue, 13 Aug 2013 07:56:40 +0000
Subject: Return error when opening read-only volumes (like RAID4/5/...) for
 writing. Previously opens succeeded, but actual write operations returned
 errors.

Requested by:	peter
MFC after:	2 weeks
---
 sys/geom/raid/g_raid.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'sys/geom/raid/g_raid.c')

diff --git a/sys/geom/raid/g_raid.c b/sys/geom/raid/g_raid.c
index fd6d69c..41a1f96 100644
--- a/sys/geom/raid/g_raid.c
+++ b/sys/geom/raid/g_raid.c
@@ -1863,6 +1863,11 @@ g_raid_access(struct g_provider *pp, int acr, int acw, int ace)
 		error = ENXIO;
 		goto out;
 	}
+	/* Deny write opens for read-only volumes. */
+	if (vol->v_read_only && acw > 0) {
+		error = EROFS;
+		goto out;
+	}
 	if (dcw == 0)
 		g_raid_clean(vol, dcw);
 	vol->v_provider_open += acr + acw + ace;
-- 
cgit v1.1