linux-kernel - Re: [PATCH 12/15] driver core: Implement tagged directory support for device classes.

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Date:	Tue, 15 Jul 2008 22:41:14 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Tejun Heo <htejun@...il.com>
Cc:	Greg KH <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	linux-kernel@...r.kernel.org, Al Viro <viro@....linux.org.uk>,
	Linux Containers <containers@...ts.osdl.org>,
	Benjamin Thery <benjamin.thery@...l.net>,
	netdev@...r.kernel.org
Subject: Re: [PATCH 12/15] driver core: Implement tagged directory support for device classes.

Tejun Heo <htejun@...il.com> writes:

> Greg, please disregard my earlier NACKs and commit the patches if you're
> okay with them.  I'm working on cleaning it up but I don't think I'll be
> able to make it in time for merge window and as Eric said getting the
> functionality in place is more important at this point as it doesn't
> affect user visible interface.
>
> Eric, with the multiple superblocks, sysfs now uses inode from the
> default sysfs_sb with dentries from other sb's.  Is this okay?  Are
> there any other filesystems which do this?

I don't know of any other filesystems where this unique challenge arises.
/proc almost qualifies but it never needs to be modified.

It is certainly ok to go from multiple dentries to a single inode.
I'm trying to remember why I choose to do that.  I think both because it simplifies
the locking and keeps us more efficient in the icache.

Eric
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