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List:       drbd-dev
Subject:    Re: [Drbd-dev] [Patch v2 02/10] drbd: Add option zap_devices to new-current-uuid
From:       Philipp Reisner <philipp.reisner () linbit ! com>
Date:       2015-07-31 12:50:53
Message-ID: 1574351.c1nomEfrHy () fat-tyre
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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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