linux-kernel - Re: [Drbd-dev] [Patch v2 02/10] drbd: Add option zap

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Message-ID: <1574351.c1nomEfrHy@fat-tyre>
Date:	Fri, 31 Jul 2015 14:50:53 +0200
From:	Philipp Reisner <philipp.reisner@...bit.com>
To:	Nick Wang <nwang@...e.com>
Cc:	drbd-dev@...ts.linbit.com, linux-kernel@...r.kernel.org,
	Lars Ellenberg <lars.ellenberg@...bit.com>
Subject: Re: [Drbd-dev] [Patch v2 02/10] drbd: Add option zap_devices to new-current-uuid

Hi Nick,

When introducing new fields alsways mark them as optional. Otherwise
a new kernel/module code would refuse netlink messages from older
drbd-utils:

> +	__flg_field(2, DRBD_GENLA_F_MANDATORY, zap_devices)

__flg_field(2, /* OPTIONAL */ 0, zap_devices)

best regards,
 Phil
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