From 20e114e334ed6ed3280c37a9a08fb95578393d1a Mon Sep 17 00:00:00 2001

From: Mateusz Kusiak <mateusz.kusiak@intel.com>

Date: Thu, 19 May 2022 09:16:08 +0200

Subject: [PATCH 14/52] Grow: block -n on external volumes.

Performing --raid-devices on external metadata volume should be blocked

as it causes unwanted behaviour.

Eg. Performing

mdadm -G /dev/md/volume -l10 -n4

on r0_d2 inside 4 disk container, returns

mdadm: Need 2 spares to avoid degraded array, only have 0.

Signed-off-by: Mateusz Kusiak <mateusz.kusiak@intel.com>

Signed-off-by: Jes Sorensen <jsorensen@fb.com>

---

 Grow.c | 8 ++++++++

 1 file changed, 8 insertions(+)

diff --git a/Grow.c b/Grow.c

index 8a242b0f..f6efbc48 100644

--- a/Grow.c

+++ b/Grow.c

@@ -1892,6 +1892,14 @@ int Grow_reshape(char *devname, int fd,

 		if (retval) {

 			pr_err("Cannot read superblock for %s\n", devname);

+			close(cfd);

+			free(subarray);

+			return 1;

+		}

+

+		if (s->raiddisks && subarray) {

+			pr_err("--raid-devices operation can be performed on a container only\n");

+			close(cfd);

 			free(subarray);

 			return 1;

 		}

-- 

2.31.1