linux-kernel - RE: [RFC 0/2] USB gadget

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Date:	Wed, 29 Aug 2012 15:17:53 +0200
From:	Andrzej Pietrasiewicz <andrzej.p@...sung.com>
To:	'Joel Becker' <jlbec@...lplan.org>,
	'Sebastian Andrzej Siewior' <bigeasy@...utronix.de>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	'Kyungmin Park' <kyungmin.park@...sung.com>,
	'Felipe Balbi' <balbi@...com>,
	'Greg Kroah-Hartman' <gregkh@...uxfoundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	'Alan Stern' <stern@...land.harvard.edu>
Subject: RE: [RFC 0/2] USB gadget - configfs

Hello Joel,

On Monday, August 20, 2012 8:00 AM Joel Becker wrote:

<snip>

> 	I think what you want here is a symlink.  Create a directory high in
> the tree called 'ready' or 'available', and when you want to lock the
> device in place, symlink it into that directory.  This will pin the item.
> You can also make use of the ->allow_link() and ->drop_link() callbacks to
> prevent symlinking an item until it is fully configured, and prevent
> unlinking an item that is in use.
> 

I have a question to you. In fs/configfs/dir.c, in a comment before
configfs_depend_item and configfs_depend_prep you say that "configfs uses
VFS to handle all locking". I am trying to understand how this
works. Could you please elaborate a bit about it? Which locks from VFS
handle "all locking"? When does locking happen?

Thanks,

Andrzej
 


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