From: Christoph Hellwig <hch@infradead.org>
To: Demi Marie Obenour <demiobenour@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>, linux-btrfs@vger.kernel.org
Subject: Re: Can the output of FIEMAP on BTRFS be used to check if a file and its reflink copy might have diverged?
Date: Mon, 22 Sep 2025 10:20:55 -0700 [thread overview]
Message-ID: <aNGFdxq6Xqduoj6w@infradead.org> (raw)
In-Reply-To: <38f350b0-9a71-4627-9d36-57bf2f85e67a@gmail.com>
On Mon, Sep 22, 2025 at 01:18:52PM -0400, Demi Marie Obenour wrote:
> Is it safe on XFS if there is no RT device and both files have been
> fsync'd and are not modified by userspace? I believe this is the case
> here: reflinks are used to snapshot the files before they are looked at.
No. Yo ucan still have defragementation or garbage collection going on
underneath.
next prev parent reply other threads:[~2025-09-22 17:20 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-22 0:07 Can the output of FIEMAP on BTRFS be used to check if a file and its reflink copy might have diverged? Demi Marie Obenour
2025-09-22 0:50 ` Qu Wenruo
2025-09-22 18:24 ` Demi Marie Obenour
2025-09-22 21:38 ` Qu Wenruo
2025-09-22 16:48 ` Christoph Hellwig
2025-09-22 17:18 ` Demi Marie Obenour
2025-09-22 17:20 ` Christoph Hellwig [this message]
2025-09-22 17:30 ` Demi Marie Obenour
2025-09-22 17:31 ` Christoph Hellwig
2025-09-22 17:54 ` Demi Marie Obenour
2025-09-29 8:50 ` Christoph Hellwig
2025-09-29 23:56 ` Demi Marie Obenour
2025-09-30 1:34 ` Demi Marie Obenour
2025-10-03 7:45 ` Christoph Hellwig
2025-09-22 23:25 ` Chris Laprise
2025-09-29 8:49 ` Christoph Hellwig
2025-09-29 23:55 ` Demi Marie Obenour
2025-10-03 7:44 ` Christoph Hellwig
2025-10-04 1:09 ` Demi Marie Obenour
2025-10-04 1:43 ` Chris Laprise
2025-10-04 4:51 ` Christoph Hellwig
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=aNGFdxq6Xqduoj6w@infradead.org \
--to=hch@infradead.org \
--cc=demiobenour@gmail.com \
--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).