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>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 2382cfc..0ddf389 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3448,6 +3448,8 @@
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 @@
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 @@
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 @@
*/
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 @@
/* 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;
