From: Jens Axboe <axboe@suse.de>
To: Andrey Borzenkov <arvidjaar@mail.ru>
Cc: Olaf Hering <olh@suse.de>, Andries Brouwer <aebr@win.tue.nl>,
Greg KH <greg@kroah.com>,
linux-hotplug-devel@lists.sourceforge.net,
linux-kernel@vger.kernel.org
Subject: Re: removable media revalidation - udev vs. devfs or static /dev
Date: Wed, 7 Jan 2004 12:05:16 +0100 [thread overview]
Message-ID: <20040107110516.GC3483@suse.de> (raw)
In-Reply-To: <200401071400.46286.arvidjaar@mail.ru>
On Wed, Jan 07 2004, Andrey Borzenkov wrote:
> On Wednesday 07 January 2004 12:50, Jens Axboe wrote:
> > > > So yeah, poll...
> > >
> > > Poll how? "kmediachangethread"? Or polling in userland? The latter would
> > > (probably) lead to endless IO errors. Not very good.
> >
> > No need to put it in the kernel, user space fits the bil nicely.
>
> unfortunately opening device in userland effectively locks tray making
> media change impossible. at least given current ->open semantic.
>
> even periodic access is quite annoying for users (tray closing while
> user attempts to insert CD)
cdrom layer handles this with O_NONBLOCK basically meaning a 'not for
data' open.
> we may agree that O_NDELAY does not affect locked state; currently
> this is not consistent across drivers (e.g. cdrom does not lock tray
> while sd does)
cdrom has no special O_NDELAY checks.
--
Jens Axboe
next prev parent reply other threads:[~2004-01-07 11:05 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-01 20:33 removable media revalidation - udev vs. devfs or static /dev Andrey Borzenkov
2004-01-03 5:58 ` Greg KH
2004-01-03 8:51 ` Andrey Borzenkov
2004-01-03 12:37 ` Andries Brouwer
2004-01-03 12:42 ` Olaf Hering
2004-01-03 16:05 ` Andrey Borzenkov
2004-01-03 17:54 ` Jens Axboe
2004-01-07 9:43 ` Olaf Hering
2004-01-07 9:50 ` Jens Axboe
2004-01-07 9:56 ` Olaf Hering
2004-01-07 9:59 ` Jens Axboe
2004-01-07 10:25 ` Olaf Hering
2004-01-07 10:31 ` Jens Axboe
2004-01-07 10:47 ` Andrey Borzenkov
2004-01-07 10:54 ` Jens Axboe
2004-01-07 17:56 ` Greg KH
2004-01-30 12:59 ` Olaf Hering
2004-01-07 11:00 ` Andrey Borzenkov
2004-01-07 11:05 ` Jens Axboe [this message]
2004-01-07 11:14 ` Andrey Borzenkov
2004-01-07 11:16 ` Jens Axboe
2004-01-03 20:51 ` Greg KH
2004-01-07 18:38 ` Linus Torvalds
2004-01-07 18:57 ` Greg KH
2004-01-07 19:23 ` Mika Penttilä
2004-01-07 19:24 ` Greg KH
2004-01-07 19:31 ` Mika Penttilä
2004-01-08 1:38 ` Linus Torvalds
2004-01-07 19:31 ` Linus Torvalds
2004-01-07 19:50 ` Greg KH
2004-01-07 20:25 ` Richard Troth
2004-01-07 20:38 ` Valdis.Kletnieks
2004-01-07 23:34 ` Greg KH
2004-01-08 0:32 ` Martin J. Bligh
2004-01-08 0:41 ` Greg KH
2004-01-08 1:07 ` Martin J. Bligh
2004-01-08 1:15 ` Greg KH
2004-01-08 1:50 ` Martin J. Bligh
2004-01-08 18:34 ` Martin Schlemmer
2004-01-08 1:48 ` Linus Torvalds
2004-01-08 14:06 ` "Andrey Borzenkov"
2004-01-08 0:42 ` viro
2004-01-08 1:16 ` Greg KH
2004-01-09 3:36 ` Joel Becker
2004-01-09 9:49 ` Gerd Knorr
2004-01-12 17:16 ` Joel Becker
2004-01-12 23:08 ` J.A. Magallon
2004-01-07 20:52 ` Olaf Hering
2004-01-08 2:03 ` Linus Torvalds
2004-01-08 4:16 ` Gene Heskett
2004-01-08 4:23 ` Linus Torvalds
2004-01-08 7:45 ` Olaf Hering
2004-01-08 2:13 ` Andries Brouwer
2004-01-08 2:19 ` Linus Torvalds
2004-01-08 2:49 ` Andries Brouwer
2004-01-08 2:56 ` Linus Torvalds
2004-01-08 3:35 ` Andries Brouwer
2004-01-08 3:43 ` Linus Torvalds
2004-01-08 8:00 ` Xavier Bestel
2004-01-09 0:28 ` Robert Love
2004-01-09 0:52 ` Linus Torvalds
2004-01-09 1:16 ` Matt Mackall
2004-01-08 10:32 ` Éric Brunet
2004-01-08 5:19 Iqbal
2004-01-12 9:09 Ling, Xiaofeng
2004-01-12 13:02 Nicolas Mailhot
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