Re: [PATCH] 2.5.14 IDE 56

Martin Dalecki
2002-05-08T09:16:43Z

Uz.ytkownik Jauder Ho napisa?:
> Ben, what you are proposing is fairly similar to what Solaris does today.
> There is a /devices directory that contains the real path while /dev
> contains the legacy stuff. Seems to work fine and given the proper docs,
> you can decipher what the /devices path points to fairly easily. So I
> certainly wouldnt mind seeing this happen for Linux eventually.

Amen, We would only have to add a device special file
to some of the /devices Stuff and /dev/ could be a symlink tree
pointing there...

I have *intentionally* named the standard mounting point
of the devicefs /devices the time I added the description
how to mount it to the driver-model.txt. The following words
are from *me*:

This can be done permanently by providing the following entry into the
/dev/fstab (under the provision that the mount point does exist, of course):

none /devices driverfs defaults 0 0

Or by hand on the command line:

~: mount -t driverfs none /devices

>
> --Jauder
>
> On Tue, 7 May 2002 benh@kernel.crashing.org wrote:
>
>
>>> /driverfs/root/pci0/00:1f.4/usb_bus/000/
>>>
>>>and it wouldn't be impossible (or even necessarily very hard) to make an
>>>IDE controller export the "IDE device tree" the same way a USB controller
>>>now exports the "USB device tree".
>>>
>>>For things like hotplug etc, I think driverfs is eventually the only way
>>>to go, simply because it gives you the full (and unambiguous) path to
>>>_any_ device, and is completely bus-agnostic.
>>>
>>>But there is definitely a potential backwards-compatibility-issue.
>>
>>One interesting thing here would be to have some optional link between
>>the bus-oriented device tree and the function-oriented tree (ie. devfs
>>or simply /dev). For example, an IDE node in driverfs could eventually
>>hold symlinks to the entries it provides in /dev when using devfs (or
>>just provide major/minor when not using devfs).
>>
>>What do you think ?
>>
>>One problem I've been faced with on ppc is to be able to match
>>a linux device with what the firmware (Open Firmware) thinks that
>>device is. The firmware view is bus-centered and it would be pretty
>>easy to provide some additional entries in driverfs that give the
>>OF fullpath of a given device. But then, the link between the actual
>>driver in driverfs and the "device" as used by, for example, the
>>filesystem isn't trivial.
>>
>>Ben.
>>
>>
>>
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>
>
>

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