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Date:   Tue, 23 Jun 2020 11:08:36 +0100
From:   Peter Maydell <>
To:     Linus Walleij <>
Cc:     "Theodore Ts'o" <>,
        Andreas Dilger <>,
        Ext4 Developers List <>,
        linux-fsdevel <>,
        Linux API <>,
        QEMU Developers <>,
        Florian Weimer <>,
        Andy Lutomirski <>
Subject: Re: [PATCH v2] fcntl: Add 32bit filesystem mode

On Fri, 29 May 2020 at 08:22, Linus Walleij <> wrote:
> It was brought to my attention that this bug from 2018 was
> still unresolved: 32 bit emulators like QEMU were given
> 64 bit hashes when running 32 bit emulation on 64 bit systems.
> This adds a flag to the fcntl() F_GETFD and F_SETFD operations
> to set the underlying filesystem into 32bit mode even if the
> file handle was opened using 64bit mode without the compat
> syscalls.

I somewhat belatedly got round to updating my QEMU patch
that uses this new fcntl() flag to fix the bug. Sorry for
the delay getting round to this. You can find the QEMU patch here:
(it's an RFC because obviously we won't put it into QEMU until
the kernel side has gone upstream and the API is final.)

What's the next step for moving this forward?

-- PMM

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