linux-kernel - Re: [PATCH] fat: Add nobarrier to workaround the strange behavior of device

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Date:   Sat, 29 Jun 2019 01:27:55 +0900
From:   OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] fat: Add nobarrier to workaround the strange behavior of device

Christoph Hellwig <hch@...radead.org> writes:

> On Sat, Jun 29, 2019 at 12:03:46AM +0900, OGAWA Hirofumi wrote:
>> I see, sounds like good though. Does it work for all stable versions?
>> Can it disable only flush command without other effect? And it would be
>> better to be normal user controllable easily.
>
> The option was added in 2.6.17, so it's been around forever.  But
> no, it obviously is not user exposed as using it on a normal drive
> can lead to data loss.

I see. It sounds like good as long term solution though (if no effect
other than disabling flush command), it may need some monitor daemon and
detect the device, and apply user policy as root. (BTW, I meant,
workaround is normal user controllable with config by root or such)

I think, it may not be good as short term solution for especially stable
users. If there is no better short term solution, I would like to still
push this patch as short term workaround.

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>