From: "Bhavik Sachdev" <b.sachdev1904@gmail.com>
To: "Miklos Szeredi" <miklos@szeredi.hu>
Cc: "Alexander Viro" <viro@zeniv.linux.org.uk>,
"Christian Brauner" <brauner@kernel.org>,
<linux-fsdevel@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
"Aleksa Sarai" <cyphar@cyphar.com>,
"Pavel Tikhomirov" <ptikhomirov@virtuozzo.com>,
"Jan Kara" <jack@suse.cz>, "John Garry" <john.g.garry@oracle.com>,
"Arnaldo Carvalho de Melo" <acme@redhat.com>,
"Darrick J . Wong" <djwong@kernel.org>,
"Namhyung Kim" <namhyung@kernel.org>,
"Ingo Molnar" <mingo@kernel.org>,
"Andrei Vagin" <avagin@gmail.com>,
"Alexander Mikhalitsyn" <alexander@mihalicyn.com>
Subject: Re: [PATCH v2 1/1] statmount: accept fd as a parameter
Date: Wed, 22 Oct 2025 23:42:32 +0530 [thread overview]
Message-ID: <DDP1YQXWXDVQ.FGRPSKHQ26HZ@gmail.com> (raw)
In-Reply-To: <CAJfpegtW_qR2+5hKPoaQnPRPixFUnL3t8XpcByKxLRJvkroP5w@mail.gmail.com>
On Wed Oct 22, 2025 at 10:02 PM IST, Miklos Szeredi wrote:
> What's wrong with statx + statmount?
We would like to get mountinfo for "unmounted" mounts i.e we have an fd
on a mount that has been unmounted with MNT_DETACH. statmount() does not
work on such mounts (with the mnt_id_unique from statx), since they have
no mount namespace. These mounts also don't show up in proc.
v1 of this patch tried a different approach by introducing a new mount
namespace for "unmounted" mounts, which had a bunch of complications
[1]. The cover letter for this patch also has more information [2].
We want to support checkpoint/restore of such fds with CRIU [3].
[1]: https://lore.kernel.org/all/20251006-erlesen-anlagen-9af59899a969@brauner/
[2]: https://lore.kernel.org/all/20251011124753.1820802-1-b.sachdev1904@gmail.com/
[3]: https://github.com/checkpoint-restore/criu/pull/2754
Kind regards,
Bhavik
prev parent reply other threads:[~2025-10-22 18:12 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-11 12:46 [PATCH v2 0/1] statmount: mountinfo for "unmounted" mounts Bhavik Sachdev
2025-10-11 12:46 ` [PATCH v2 1/1] statmount: accept fd as a parameter Bhavik Sachdev
2025-10-21 12:11 ` Christian Brauner
2025-10-22 15:39 ` Bhavik Sachdev
2025-10-22 16:32 ` Miklos Szeredi
2025-10-22 18:12 ` Bhavik Sachdev [this message]
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