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Date:      Sat, 28 Oct 2017 16:41:38 -0700
From:      Conrad Meyer <cem@freebsd.org>
To:        Kirk McKusick <mckusick@mckusick.com>
Cc:        Mark Johnston <markj@freebsd.org>, freebsd-fs@freebsd.org
Subject:   Re: softdep as a mount(8) option
Message-ID:  <CAG6CVpWvLz5VXWrsKCSdZFx9Zafmk-1qSwarEbO=F-4FJfeLkw@mail.gmail.com>
In-Reply-To: <201710282225.v9SMPDCZ074228@chez.mckusick.com>
References:  <20171027153859.GC2385@raichu> <201710282225.v9SMPDCZ074228@chez.mckusick.com>

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On Sat, Oct 28, 2017 at 3:25 PM, Kirk McKusick <mckusick@mckusick.com> wrote:
> While it is safe and possible to add soft-updates (but not journalled
> soft updates) as a mount option, it means that fsck will not know that
> soft updates were in use, so it will always run in full (slow) mode at
> boot time. This is why I have not added it as an option.

Hi Kirk,

Would it be possible to add a bit, like the dirty bit, that fsck can
use to determine that the last mount of a filesystem used SU?  That
way we can retain fsck performance at the same time as enabling
mount-time choice of SU.

Best,
Conrad



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