linux-kernel - Re: [PATCH] [REGRESSION] ovl: Handle ENOSYS when fileattr support is missing in lower/upper fs

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Date:   Mon, 18 Jul 2022 22:33:48 +0200
From:   Christian Kohlschütter 
        <christian@...lschutter.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Miklos Szeredi <miklos@...redi.hu>,
        overlayfs <linux-unionfs@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] [REGRESSION] ovl: Handle ENOSYS when fileattr support is
 missing in lower/upper fs

> Am 18.07.2022 um 22:12 schrieb Linus Torvalds <torvalds@...ux-foundation.org>:
> 
> On Mon, Jul 18, 2022 at 12:28 PM Miklos Szeredi <miklos@...redi.hu> wrote:
>> 
>> So this is a bug in the kernel part of fuse, that doesn't catch and
>> convert ENOSYS in case of the ioctl request.
> 
> Ahh, even better. No need to worry about external issues.
> 
>            Linus

My concern was fixing it in fuse instead of ovl would leave non-fuse filesystems affected (even though I don't have proof that such filesystems exist).

I'm glad you are OK with Miklos' change; the outcome of this discussion certainly adds some nuance to the famous "don't break userspace" / error code thread from 2012.

Best,
Christian