linux-kernel - Re: [PATCH] Missing usb_find

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Date:	Thu, 24 Jan 2008 14:34:00 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Oliver Neukum" <oliver@...kum.org>
Cc:	"Wilco Beekhuizen" <wilcobeekhuizen@...il.com>,
	"Greg KH" <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Missing usb_find_device symbol from usb.c

Hi Oliver,

On Jan 24, 2008 2:24 PM, Oliver Neukum <oliver@...kum.org> wrote:
> > Sure but the filesystems in fs/ are general purpose and they can be
> > mounted on top of any block device (except for the in-memory ones like
>
> nfs, cifs, jffs, ...

But none of them mess around with *hardware*. Sure, you can split it
in two: driver and filesystem but yet again, the latter is not general
purpose at all. I think this is somewhat similar to spufs which is
really hardware specific and thus not eligible for fs/.

On Jan 24, 2008 2:24 PM, Oliver Neukum <oliver@...kum.org> wrote:
> > sysfs). Furthermore, the problem with iriverfs is that it assumes that
> > there can be only one device plugged to the host. What we want is
> > something like
> >
> >   $ mount -t iriverfs /dev/iriver0 /mnt/media
> >
> > Which can be accomplished with an USB driver in driver/usb/ that
> > registers the special iriverfs.
>
> And what happens if you do
> mount -t vfat /dev/iriver0 /mnt/media ?

If /dev/iriver0 is registered as a block device, we read the
superblock but don't find a vfat filesystem and the mount fails as
expected. As for

   mount -t iriverfs /dev/sd1 /mnt/media

we need to make sure file_system_type->get_sb() does something like
what drivers/mtd/mtdsuper.c::get_sb_mtd() does to make sure we only
let it mount if the block device is indeed an iriver player.

                        Pekka
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