linux-ext4 - Re: [PATCH] fcntl: Add 32bit filesystem mode

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Message-ID: <87v9luwgc6.fsf@mid.deneb.enyo.de>
Date:   Mon, 20 Apr 2020 13:23:53 +0200
From:   Florian Weimer <fw@...eb.enyo.de>
To:     Peter Maydell <peter.maydell@...aro.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "Theodore Ts'o" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        QEMU Developers <qemu-devel@...gnu.org>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH] fcntl: Add 32bit filesystem mode

* Peter Maydell:

> We open fd 3 to read '.'; we issue the new fcntl, which
> succeeds. Then there's some unrelated stuff operating on
> stdout. Then we do a getdents64(), but the d_off values
> we get back are still 64 bits. The guest binary doesn't
> like those, so it fails. My expectation was that we would
> get back d_off values here that were in the 32 bit range.

What's your file system?

I think not all of them have 32-bit hashes (some of them probably
can't, particularly in the network-based file system case).