From bd8839e03b8e70fbbe08bbff70d8cba95273c823 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Wed, 28 May 2014 13:39:21 +1000
Subject: [PATCH] md: refuse to change shape of array if it is active but
read-only
read-only arrays should not be changed. This includes changing
the level, layout, size, or number of devices.
So reject those changes for readonly arrays.
Signed-off-by: NeilBrown <neilb@suse.de>
---
drivers/md/md.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 2382cfc9bb3f5..0ddf38988fbc8 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3448,6 +3448,8 @@ level_store(struct mddev *mddev, const char *buf, size_t len)
mddev->level = LEVEL_NONE;
return rv;
}
+ if (mddev->ro)
+ return -EROFS;
/* request to change the personality. Need to ensure:
* - array is not engaged in resync/recovery/reshape
@@ -3634,6 +3636,8 @@ layout_store(struct mddev *mddev, const char *buf, size_t len)
int err;
if (mddev->pers->check_reshape == NULL)
return -EBUSY;
+ if (mddev->ro)
+ return -EROFS;
mddev->new_layout = n;
err = mddev->pers->check_reshape(mddev);
if (err) {
@@ -3723,6 +3727,8 @@ chunk_size_store(struct mddev *mddev, const char *buf, size_t len)
int err;
if (mddev->pers->check_reshape == NULL)
return -EBUSY;
+ if (mddev->ro)
+ return -EROFS;
mddev->new_chunk_sectors = n >> 9;
err = mddev->pers->check_reshape(mddev);
if (err) {
@@ -6135,6 +6141,8 @@ static int update_size(struct mddev *mddev, sector_t num_sectors)
*/
if (mddev->sync_thread)
return -EBUSY;
+ if (mddev->ro)
+ return -EROFS;
rdev_for_each(rdev, mddev) {
sector_t avail = rdev->sectors;
@@ -6157,6 +6165,8 @@ static int update_raid_disks(struct mddev *mddev, int raid_disks)
/* change the number of raid disks */
if (mddev->pers->check_reshape == NULL)
return -EINVAL;
+ if (mddev->ro)
+ return -EROFS;
if (raid_disks <= 0 ||
(mddev->max_disks && raid_disks >= mddev->max_disks))
return -EINVAL;
--
2.30.2