Date: Wed, 23 Sep 2015 08:59:35 -0700 From: Conrad Meyer <cem@FreeBSD.org> To: Andriy Gapon <avg@freebsd.org> Cc: FreeBSD Current <freebsd-current@freebsd.org>, freebsd-rc@freebsd.org Subject: Re: dumpdev in loader.conf vs rc.d/dumpon Message-ID: <CAG6CVpVvStV1pUi8WEBS0T5PaHxFk_HxGi8ch-LXU_DiheyTGw@mail.gmail.com> In-Reply-To: <5602B922.20703@FreeBSD.org> References: <5602B922.20703@FreeBSD.org>
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On Wed, Sep 23, 2015 at 7:37 AM, Andriy Gapon <avg@freebsd.org> wrote: > > I have recently discovered 'dumpdev' kernel environment variable that is > settable, for example, from loader.conf. To me it *seems* that this variable > has to be set to a device name / path without the leading '/dev'. Why? > If that's so, > then rc.d/dumpon must prepend '/dev' when passing the value of 'dumpdev' to > dumpon(8). dumpon(8) opens the configured file (accessible in the normal namespace, i.e. "/dev/ada0s1b") and uses a magical ioctl on the device to configure it as the dump device. This is all documented in dumpon(8). Additionally, dumpon.c is short and quite legible. I don't see etc/rc.d/dumpon prepending /dev to anything. Best, Conrad
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