dcssblk: issue warning when trying to save SN/EN type DCSS
The content of a DCSS of type SN or EN cannot be saved. Issue a warning when trying to save such a DCSS. Depending on the setup, this may be a user error or intended behaviour e.g. with a multi-DCSS device. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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