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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>
This commit is contained in:
NeilBrown 2014-05-28 13:39:21 +10:00
parent 2ac295a544
commit bd8839e03b
1 changed files with 10 additions and 0 deletions
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10
drivers/md/md.c
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@ -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;