linux-kernel - Re: [BUG] FLOPPY DRIVER since 5.10.20

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Message-ID: <e49603c2-ac36-12b0-57cf-ff5ab30115bc@linux.com>
Date:   Mon, 26 Jul 2021 10:57:45 +0300
From:   Denis Efremov <efremov@...ux.com>
To:     markh@...pro.net, linux-block@...r.kernel.org,
        Linux-kernel <linux-kernel@...r.kernel.org>
Cc:     Jiri Kosina <jkosina@...e.cz>, Mark Hounschell <dmarkh@....rr.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [BUG] FLOPPY DRIVER since 5.10.20

Hi,

On 7/23/21 9:47 PM, Mark Hounschell wrote:
> 
> These 2 incremental patches, patch-5.10.19-20 and patch-5.11.2-3 have broken the user land fd = open("/dev/fd0", (O_RDWR | O_NDELAY)); functionality.

Thank you for the report, I'm looking into this.

> Since FOREVER before the patch, when using O_NDELAY, one could open the floppy device with no media inserted or even with write protected media without error. "Read-only file system" status is returned only when we actually tried to write to it. We have software still in use today that relies on this functionality.

If it's a project with open sources could you please give a link?

Regards,
Denis