From: Yi Zhang <yizhan@redhat.com>
Date: Fri, 11 Mar 2016 09:26:40 +0000 (+0800)
Subject: Grow: analyse_change add notification about only 2-device can be convert from RAID1... 
X-Git-Tag: mdadm-4.0~110
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a58e0da4436269cdb5f40efadf94f4d02b7e8d61;p=thirdparty%2Fmdadm.git

Grow: analyse_change add notification about only 2-device can be convert from RAID1 to RAID5

Notify "Can only convert a 2-device array to RAID5" instead of
"Impossibly level change request for RAID1" when convert from
RAID1 to RAID5 if the disk num is not equal two like RAID4/5->RAID1
did.

Signed-off-by: Yi Zhang <yizhan@redhat.com>
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---

diff --git a/Grow.c b/Grow.c
index d9db00be..3204135b 100755
--- a/Grow.c
+++ b/Grow.c
@@ -1077,6 +1077,9 @@ char *analyse_change(char *devname, struct mdinfo *info, struct reshape *re)
 			re->level = 1;
 			return NULL;
 		}
+		if (info->array.raid_disks != 2 &&
+		    info->new_level == 5)
+			return "Can only convert a 2-device array to RAID5";
 		if (info->array.raid_disks == 2 &&
 		    info->new_level == 5) {