From: Andries Brouwer <aebr@win.tue.nl>
To: Andrew Morton <akpm@osdl.org>
Cc: Andries Brouwer <aebr@win.tue.nl>,
greg@kroah.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] print_dev_t for 2.6.0-test1-mm
Date: Thu, 17 Jul 2003 01:44:10 +0200 [thread overview]
Message-ID: <20030717014410.A2026@pclin040.win.tue.nl> (raw)
In-Reply-To: <20030716152143.6ab7d7d3.akpm@osdl.org>; from akpm@osdl.org on Wed, Jul 16, 2003 at 03:21:43PM -0700
On Wed, Jul 16, 2003 at 03:21:43PM -0700, Andrew Morton wrote:
> > > Why do we need the 16:16 option?
> >
> > It is not very important, but major 0 is reserved, so if userspace
> > (or a filesystem) hands us a 32-bit device number, we have to
> > split that in some way, not 0+32. Life is easiest with 16+16.
> > (Now the major is nonzero, otherwise we had 8+8.)
> > Other choices lead to slightly more complicated code.
> >
>
> Why would anyone hand the kernel a 32-bit device number? They're either 16
> or 64, are they not?
The kernel has no control over what userspace comes with.
And here userspace includes filesystems.
Not all filesystems know how to come with 64 bits.
Andries
next prev parent reply other threads:[~2003-07-16 23:30 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-16 18:46 [PATCH] print_dev_t for 2.6.0-test1-mm Greg KH
2003-07-16 20:09 ` Andrew Morton
2003-07-16 21:02 ` Greg KH
2003-07-16 21:13 ` Andrew Morton
2003-07-16 21:34 ` Andries Brouwer
2003-07-16 21:39 ` Andrew Morton
2003-07-16 22:10 ` H. Peter Anvin
2003-07-16 22:20 ` Andries Brouwer
2003-07-16 22:21 ` Andrew Morton
2003-07-16 23:44 ` Andries Brouwer [this message]
2003-07-16 23:49 ` Andrew Morton
2003-07-17 8:27 ` Joel Becker
2003-07-17 8:47 ` Roman Zippel
2003-07-17 9:15 ` Joel Becker
2003-07-17 9:24 ` Andrew Morton
2003-07-17 10:10 ` Trond Myklebust
2003-07-17 11:46 ` Andries Brouwer
2003-07-17 11:52 ` Alan Cox
2003-07-17 10:26 ` Andries Brouwer
2003-07-17 10:46 ` Miquel van Smoorenburg
2003-07-17 11:19 ` Andries Brouwer
2003-07-17 11:46 ` Miquel van Smoorenburg
2003-07-17 21:55 ` Andrew Morton
2003-07-17 22:24 ` Andries Brouwer
2003-07-17 22:43 ` Joel Becker
2003-07-17 23:11 ` Andries Brouwer
2003-07-17 23:49 ` Miquel van Smoorenburg
2003-07-18 0:04 ` Andries Brouwer
2003-07-18 0:04 ` Joel Becker
2003-07-18 1:05 ` Andries Brouwer
2003-07-18 8:06 ` Joel Becker
2003-07-17 3:00 ` H. Peter Anvin
[not found] ` <200307170300.UAA24096@cesium.transmeta.com>
2003-07-17 10:43 ` Andries Brouwer
2003-07-20 14:33 ` H. Peter Anvin
2003-07-16 21:36 ` Greg KH
2003-07-16 22:00 ` Andrew Morton
2003-07-16 22:11 ` what's left for 64 bit dev_t Greg KH
2003-07-16 22:19 ` Andrew Morton
2003-07-16 22:48 ` Greg KH
2003-07-17 3:02 ` H. Peter Anvin
2003-07-17 13:59 ` Andries Brouwer
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