From: Chris Murphy <lists@colorremedies.com>
To: Matthew Warren <matthewwarren101010@gmail.com>
Cc: David Sterba <dsterba@suse.cz>,
Btrfs BTRFS <linux-btrfs@vger.kernel.org>
Subject: Re: Changing the checksum algorithm on an existing BTRFS filesystem
Date: Mon, 4 Oct 2021 16:37:48 -0400 [thread overview]
Message-ID: <CAJCQCtRCr+xHBSGZEV+KTY+S+79ZhJ1rWZUByecTUdjOJiLQTA@mail.gmail.com> (raw)
In-Reply-To: <CA+H1V9yopc2okgT=5XeCwvHF8oXPVhnojaf_rZOeuiThZEfqWQ@mail.gmail.com>
On Mon, Oct 4, 2021 at 12:02 PM Matthew Warren
<matthewwarren101010@gmail.com> wrote:
>
> I don't know how btrfs is layed out internally, but is checksum tree
> separate from file (meta)data or is it part of the (meta)data? If it's
> separate it should be possible to build a second csum tree and then
> replace the old one once it's done, right?
Yes, but the other trees still use the old checksum algo. The simplest
way to do this and ensure it's atomic and thus crash safe is offline
conversion. And of course offline conversion doesn't really scale.
--
Chris Murphy
next prev parent reply other threads:[~2021-10-04 20:38 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-04 5:26 Changing the checksum algorithm on an existing BTRFS filesystem Matthew Warren
2021-10-04 6:20 ` Nikolay Borisov
2021-10-04 9:51 ` David Sterba
2021-10-04 16:01 ` Matthew Warren
2021-10-04 20:37 ` Chris Murphy [this message]
2021-10-04 22:54 ` Qu Wenruo
2021-10-05 3:26 ` Zygo Blaxell
2021-10-05 6:00 ` Qu Wenruo
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