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From: Mark Hounschell <>
To: Denis Efremov <>,,,
	Linux-kernel <>
Cc: Jiri Kosina <>,
	Greg Kroah-Hartman <>
Subject: Re: [BUG] FLOPPY DRIVER since 5.10.20
Date: Mon, 26 Jul 2021 08:23:48 -0400	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On 7/26/21 7:37 AM, Denis Efremov wrote:
> On 7/26/21 2:17 PM, Mark Hounschell wrote:
>> 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?
>>> Regards,
>>> Denis
>> This is immaterial but fdutils and libdsk both use rely on this flag. Who can know who else does. The point is it should NOT have been changed.
> Yes, I asked this only to add utils and this behavior to the tests.
> And be more specific about why we should preserve this behavior in
> next commit messages.

Well, first thing is now you can't open a floppy with a write protected 
floppy installed. I don't think that was intended but that is now how it is.

Next there are commands that can be sent to the floppy via "ioctl(fd, 
FDRAWCMD,  &raw_cmd);" that do NOT require a floppy diskette to be 

All commands issued to the device that require a floppy diskette without 
a diskette installed fail with the proper status letting you know the 
device is not ready / no diskette installed. That goes for write 
protected floppies too.

There is no reason to force a user to only be able to operate on Linux 
fdformat formatted floppies.


  reply	other threads:[~2021-07-26 12:31 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-23 18:47 [BUG] FLOPPY DRIVER since 5.10.20 Mark Hounschell
2021-07-26  7:57 ` Denis Efremov
2021-07-26 11:15   ` Mark Hounschell
2021-07-26 11:17   ` Mark Hounschell
2021-07-26 11:37     ` Denis Efremov
2021-07-26 12:23       ` Mark Hounschell [this message]
2021-07-26 16:34         ` Denis Efremov
2021-07-30  5:15           ` Denis Efremov
2021-08-01 11:14             ` Kurt Garloff
2021-08-08  7:42 ` [PATCH] Revert "floppy: reintroduce O_NDELAY fix" Denis Efremov
2021-08-16  7:17   ` Jiri Kosina
2021-08-18 15:53     ` Denis Efremov
2021-08-30  9:20   ` Thorsten Leemhuis

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