linux-kernel - Re: [PATCH 007 of 7] md: Get name for block device in sysfs

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Date:	Mon, 17 Dec 2007 03:10:14 +0100
From:	Kay Sievers <kay.sievers@...y.org>
To:	Neil Brown <neilb@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jens Axboe <jens.axboe@...cle.com>, Greg KH <greg@...ah.com>
Subject: Re: [PATCH 007 of 7] md: Get name for block device in sysfs

On Mon, 2007-12-17 at 09:43 +1100, Neil Brown wrote:
> On Saturday December 15, kay.sievers@...y.org wrote:
> > On Dec 14, 2007 7:26 AM, NeilBrown <neilb@...e.de> wrote:
> > >
> > > Given an fd on a block device, returns a string like
> > >
> > >         /block/sda/sda1
> > >
> > > which can be used to find related information in /sys.
> ....
> > 
> > As pointed out to when you came up with the idea, we can't do this. A devpath
> > is a path to the device and will not necessarily start with "/block" for block
> > devices. It may start with "/devices" and can be much longer than
> > BDEVNAME_SIZE*2  + 10.
> 
> When you say "will not necessarily" can I take that to mean that it
> currently does, but it might (will) change??

It's in -mm. The devpath for all block devices, like for all other
devices, will start with /devices/* if !SYSFS_DEPRECATED.

> In that case can we have the patch as it stands and when the path to
> block devices in /sys changes, the ioctl can be changed at the same
> time to match?

No, you have to use kobject_get_path() to get the path to the object.
This will also handle devices where the name contains '/' which needs to
be translated to '!', which is broken in this patch.

> Or are you saying that as the kernel is today, some block devices
> appear under /devices/..., in which case could you please give an
> example?

We expect the next kernel to have it.

Btw: BLKGETNAME should probably be renamed to something which contains
DEVPATH, to make clear that it's a path to, and not the name of the
device.

Kay

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