linux-kernel - Re: [PATCH v2] md/raid0: add config parameters to specify zone layout

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Message-ID: <81A991E8-B87E-4518-9643-45037A104981@fb.com>
Date:   Fri, 24 Apr 2020 23:22:23 +0000
From:   Song Liu <songliubraving@...com>
To:     Jason Baron <jbaron@...mai.com>
CC:     "rdunlap@...radead.org" <rdunlap@...radead.org>,
        "neilb@...e.de" <neilb@...e.de>,
        "guoqing.jiang@...ud.ionos.com" <guoqing.jiang@...ud.ionos.com>,
        "agk@...hat.com" <agk@...hat.com>,
        "snitzer@...hat.com" <snitzer@...hat.com>,
        "linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] md/raid0: add config parameters to specify zone layout



> On Mar 30, 2020, at 9:00 AM, Jason Baron <jbaron@...mai.com> wrote:
> 
> Let's add some CONFIG_* options to directly configure the raid0 layout
> if you know in advance how your raid0 array was created. This can be
> simpler than having to manage module or kernel command-line parameters.
> 
> If the raid0 array was created by a pre-3.14 kernel, use
> RAID0_ORIG_LAYOUT. If the raid0 array was created by a 3.14 or newer
> kernel then select RAID0_ALT_MULTIZONE_LAYOUT. Otherwise, the default
> setting is RAID0_LAYOUT_NONE, in which case the current behavior of
> needing to specify a module parameter raid0.default_layout=1|2 is
> preserved.
> 
> Cc: Guoqing Jiang <guoqing.jiang@...ud.ionos.com>
> Cc: NeilBrown <neilb@...e.de>
> Cc: Song Liu <songliubraving@...com>
> Signed-off-by: Jason Baron <jbaron@...mai.com>

This patch looks good. However, I am not sure whether the user will 
recompile the kernel for a different default value. Do you have real
world use case for this?

Thanks,
Song