From: Roman Mamedov <rm@romanrm.net>
To: Yuwei Han <hrx@bupt.moe>
Cc: dsterba@suse.cz, linux-btrfs@vger.kernel.org
Subject: Re: [RFC] New ioctl to query deleted subvolumes
Date: Fri, 11 Oct 2024 17:20:43 +0500 [thread overview]
Message-ID: <20241011172043.122e81ff@nvm> (raw)
In-Reply-To: <E2F46BD92527EA46+29cb502c-a5ee-48db-a439-ab692a3747b9@bupt.moe>
On Fri, 11 Oct 2024 20:06:00 +0800
Yuwei Han <hrx@bupt.moe> wrote:
> There is a misunderstanding. What I mean is that why users need to
> "confirm" subvol is deleted? I can't come up with actual usage. Hope you
> can help me with that.
A backup system may delete outdated subvolumes first, then wait until the
space has actually freed up, before copying new data; otherwise it could run
out of disk space. Especially considering that IO from starting to copy
without such a wait would interfere with the cleaner process IO, resulting in
it taking a longer time to finish.
Or in my case I also wait until deleted subvolumes have been freed up *after*
a backup, to then record how much remaining space a backup disk actually has,
before unmounting it and putting into storage.
--
With respect,
Roman
next prev parent reply other threads:[~2024-10-11 12:27 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-09 18:03 [RFC] New ioctl to query deleted subvolumes David Sterba
2024-10-10 12:29 ` Yuwei Han
2024-10-10 17:08 ` David Sterba
2024-10-11 12:06 ` Yuwei Han
2024-10-11 12:20 ` Roman Mamedov [this message]
2024-10-12 1:45 ` Yuwei Han
2024-10-11 15:48 ` David Sterba
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=20241011172043.122e81ff@nvm \
--to=rm@romanrm.net \
--cc=dsterba@suse.cz \
--cc=hrx@bupt.moe \
--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