Btrfs: disallow 'btrfs {balance,replace} cancel' on ro mounts
For both balance and replace, cancelling involves changing the on-disk state and committing a transaction, which is not a good thing to do on read-only filesystems. Cc: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: NIlya Dryomov <idryomov@gmail.com> Signed-off-by: NJosef Bacik <jbacik@fusionio.com> Signed-off-by: NChris Mason <chris.mason@fusionio.com>
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