Re: [PATCH RESEND] floppy: fix open(O_ACCMODE) for ioctl-only open

From: Jiri Kosina
Date: Tue Jan 19 2021 - 10:55:28 EST

On Mon, 25 Jul 2016, Jens Axboe wrote:

> > From: Jiri Kosina <jkosina@xxxxxxx>
> >
> > Commit 09954bad4 ("floppy: refactor open() flags handling"), as a
> > side-effect, causes open(/dev/fdX, O_ACCMODE) to fail. It turns out that
> > this is being used setfdprm userspace for ioctl-only open().
> >
> > Reintroduce back the original behavior wrt !(FMODE_READ|FMODE_WRITE)
> > modes, while still keeping the original O_NDELAY bug fixed.
> >
> > Cc: stable@xxxxxxxxxxxxxxx # v4.5+
> > Reported-by: Wim Osterholt <wim@xxxxxxxxxxxxxx>
> > Tested-by: Wim Osterholt <wim@xxxxxxxxxxxxxx>
> > Signed-off-by: Jiri Kosina <jkosina@xxxxxxx>
> Added for this series, thanks.

[ CCing Denis too ]

Let me revive this 4 years old thread.

I've just now noticed that instead of my patch above being merged, what
happened instead was

commit f2791e7eadf437633f30faa51b30878cf15650be
Author: Jens Axboe <axboe@xxxxxx>
Date: Thu Aug 25 08:56:51 2016 -0600

Revert "floppy: refactor open() flags handling"

This reverts commit 09954bad448791ef01202351d437abdd9497a804.

which was plain revert of 09954bad4 (without any further explanation),
which in turn reintroduced the O_NDELAY issue, and I've just been hit by
it again.

I am not able to find any e-mail thread that'd indicate why ultimately
revert happened, instead of mergin my fix.
Jens, do you have any idea?


Jiri Kosina