From: Chris Murphy <lists@colorremedies.com>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Btrfs BTRFS <linux-btrfs@vger.kernel.org>
Subject: Re: Reading files with bad data checksum
Date: Sun, 10 Jan 2021 15:45:28 -0700 [thread overview]
Message-ID: <CAJCQCtQ2o=K2+ZNifF44mohYNmpYMgn8twz_7gsV45RRfg2YzA@mail.gmail.com> (raw)
In-Reply-To: <1ad3962943592e9a60f88aecdb493f368c70bbe1.camel@infradead.org>
On Sun, Jan 10, 2021 at 4:54 AM David Woodhouse <dwmw2@infradead.org> wrote:
>
> I filed https://bugzilla.redhat.com/show_bug.cgi?id=1914433
>
> What I see is that *both* disks of the RAID-1 have data which is
> consistent, and does not match the checksum that btrfs expects:
Yeah either use nodatacow (chattr +C) or don't use O_DIRECT until
there's a proper fix.
> What's the best way to recover the data?
I'd say, kernel 5.11's new "mount -o ro,rescue=ignoredatacsums"
feature. You can copy it out normally, no special tools.
The alternative is 'btrfs restore'.
--
Chris Murphy
next prev parent reply other threads:[~2021-01-10 22:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-10 11:52 Reading files with bad data checksum David Woodhouse
2021-01-10 12:08 ` Forza
2021-01-10 12:36 ` David Woodhouse
2021-01-11 18:56 ` Goffredo Baroncelli
2021-01-10 22:45 ` Chris Murphy [this message]
2021-01-11 8:23 ` Nikolay Borisov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CAJCQCtQ2o=K2+ZNifF44mohYNmpYMgn8twz_7gsV45RRfg2YzA@mail.gmail.com' \
--to=lists@colorremedies.com \
--cc=dwmw2@infradead.org \
--cc=linux-btrfs@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).