linux-ext4 - RE: [PATCH] ext4: Fix possible corruption when moving a directory with RENAME

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Message-ID: <58ea6b856874446c85c6c302016f9a61@AcuMS.aculab.com>
Date:   Wed, 24 May 2023 14:25:11 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Jan Kara' <jack@...e.cz>, Amir Goldstein <amir73il@...il.com>
CC:     Ted Tso <tytso@....edu>,
        "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
        "Darrick J. Wong" <djwong@...nel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH] ext4: Fix possible corruption when moving a directory
 with RENAME_EXCHANGE

From: Jan Kara
> Sent: 24 May 2023 15:19
....
> Right, so this case indeed looks possible and I didn't think about it.
> Thanks for spotting this! Let me try to persuade Al again to do the
> necessary locking in VFS as it is getting really hairy and needs VFS
> changes anyway.

I think it was NetBSD that started using a global lock for
non-trival renames because otherwise it is all 'just too hard'.

	David

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