From: "Darrick J. Wong" <djwong@kernel.org>
To: Anand Suveer Jain <asj@kernel.org>
Cc: fstests@vger.kernel.org, linux-btrfs@vger.kernel.org,
linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org,
linux-f2fs-devel@lists.sourceforge.net, zlang@redhat.com,
hch@infradead.org
Subject: Re: [PATCH v7 06/11] fstests: verify f_fsid for cloned filesystems
Date: Tue, 21 Jul 2026 16:25:48 -0700 [thread overview]
Message-ID: <20260721232548.GU7398@frogsfrogsfrogs> (raw)
In-Reply-To: <18d569b9-dbea-448c-8b3d-56de32c0d6ef@kernel.org>
On Wed, Jul 22, 2026 at 07:21:15AM +0800, Anand Suveer Jain wrote:
>
>
> >>> just in case there *are* programs foolish enough to
> >>> use (fsid,ino) as a uniqueness check.
> >>
> >> On the other hand, if a program needs a unique ID, do we currently have
> >> any way to get one?
> >
> > I don't think there is a way to get a globally unique identifier for a
> > filesystem image except for the meta_uuid filesystems, and even then
> > only if the volume manager resets the user-visible uuid every time it
> > makes a clone and nobody runs a duplicator.
>
> Yeah, interesting problem to solve though.
> Do you have any further code review comments on this test case?
Not really, no.
--D
next prev parent reply other threads:[~2026-07-21 23:25 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-17 11:20 [PATCH v7 0/11] fstests: add test coverage for cloned filesystem ids Anand Jain
2026-06-17 11:20 ` [PATCH v7 01/11] fstests: add _loop_image_create_clone() helper Anand Jain
2026-07-01 17:07 ` Darrick J. Wong
2026-07-21 22:38 ` Anand Suveer Jain
2026-06-17 11:20 ` [PATCH v7 02/11] fstests: add _clone_mount_option() helper Anand Jain
2026-06-17 11:20 ` [PATCH v7 03/11] fstests: add FSNOTIFYWAIT_PROG Anand Jain
2026-06-17 11:20 ` [PATCH v7 04/11] fstests: add _require_unique_f_fsid() helper Anand Jain
2026-07-01 17:11 ` Darrick J. Wong
2026-07-21 22:37 ` Anand Suveer Jain
2026-06-17 11:20 ` [PATCH v7 05/11] fstests: verify fanotify isolation on cloned filesystems Anand Jain
2026-07-01 17:12 ` Darrick J. Wong
2026-07-21 22:36 ` Anand Suveer Jain
2026-06-17 11:20 ` [PATCH v7 06/11] fstests: verify f_fsid for " Anand Jain
2026-07-01 17:33 ` Darrick J. Wong
2026-07-21 22:36 ` Anand Suveer Jain
2026-07-21 22:57 ` Darrick J. Wong
2026-07-21 23:21 ` Anand Suveer Jain
2026-07-21 23:25 ` Darrick J. Wong [this message]
2026-06-17 11:20 ` [PATCH v7 07/11] fstests: verify libblkid resolution of duplicate UUIDs Anand Jain
2026-06-17 11:20 ` [PATCH v7 08/11] fstests: verify IMA isolation on cloned filesystems Anand Jain
2026-06-17 11:20 ` [PATCH v7 09/11] fstests: verify exportfs file handles " Anand Jain
2026-06-17 11:20 ` [PATCH v7 10/11] fstests: add _change_metadata_uuid helper Anand Jain
2026-06-17 11:20 ` [PATCH v7 11/11] fstests: test UUID consistency for clones with metadata_uuid Anand Jain
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