linux-kernel - Re: Regression in squashfs mount option handling in v5.4

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Date:   Tue, 10 Dec 2019 19:50:02 +0100
From:   Jeremi Piotrowski <jeremi.piotrowski@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        Al Viro <viro@...IV.linux.org.uk>,
        David Howells <dhowells@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Phillip Lougher <phillip@...ashfs.org.uk>
Subject: Re: Regression in squashfs mount option handling in v5.4

On Sat, Nov 30, 2019 at 10:56:47AM -0800, Randy Dunlap wrote:
> [adding Cc-s]
> 
> On 11/30/19 10:15 AM, Jeremi Piotrowski wrote:
> > Hi,
> > 
> > I'm working on an embedded project which uses 'rauc' as an updater. rauc mounts
> > a squashfs image using
> > 
> >   mount -t squashfs -o ro,loop,sizelimit=xxx squashfs.img /mnt
> > 
> > On my system mount is busybox, and busybox does not know the sizelimit
> > parameter, so it simply passes it on to the mount syscall. The syscall
> > arguments end up being:
> > 
> >   mount("/dev/loop0", "dir", "squashfs", MS_RDONLY|MS_SILENT, "sizelimit=xxx")
> > 
> > Until kernel 5.4 this worked, since 5.4 this returns EINVAL and dmesg contains
> > the line "squashfs: Unknown parameter 'sizelimit'". I believe this has to do
> > with the conversion of squashfs to the new mount api. 
> > 
> > This is an unfortunate regression, and it does not seem like this can be simply
> > reverted. What is the suggested course of action?
> > 
> > Please cc me on replies, I'm not subscribed to the list.
> > 
> > Thanks,
> > Jeremi
> > 
> 
> 
> -- 
> ~Randy
> Reported-by: Randy Dunlap <rdunlap@...radead.org>

Ping. This is preventing me from updating the kernel on my systems.