Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Reply-To: dmarkh@cfl.rr.com
Subject: Re: [BUG] FLOPPY DRIVER since 5.10.20
To:     Denis Efremov <efremov@linux.com>, markh@compro.net,
        linux-block@vger.kernel.org,
        Linux-kernel <linux-kernel@vger.kernel.org>
Cc:     Jiri Kosina <jkosina@suse.cz>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
References: <de10cb47-34d1-5a88-7751-225ca380f735@compro.net>
 <e49603c2-ac36-12b0-57cf-ff5ab30115bc@linux.com>
From:   Mark Hounschell <dmarkh@cfl.rr.com>
Message-ID: <2f4037b6-7ab3-9592-aaf0-dfcda19d61bc@cfl.rr.com>
Date:   Mon, 26 Jul 2021 07:15:31 -0400
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101
 Thunderbird/78.12.0
MIME-Version: 1.0
In-Reply-To: <e49603c2-ac36-12b0-57cf-ff5ab30115bc@linux.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 7/26/21 3:57 AM, Denis Efremov wrote:
> 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?
> 

This is imatterial