linux-kernel - Re: nbd: add locking to nbd

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Message-ID: <20090116120843.GA29971@elf.ucw.cz>
Date:	Fri, 16 Jan 2009 13:08:43 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, Paul.Clements@...eleye.com
Subject: Re: nbd: add locking to nbd_ioctl

On Fri 2009-01-16 12:55:12, Pavel Machek wrote:
> 
> The code was written with "oh big kernel lock, please protect me from
> all the evil" mentality: it does not locks its own data structures, it
> just hopes that big kernel lock somehow helps.
> 
> It does not. (My fault).
> 
> So this uses tx_lock to protect data structures from concurrent use
> between ioctl and worker threads.
> 
> Signed-off-by: Pavel Machek <pavel@...e.cz>

Ok, it should return -EINVAL at the end of __nbd_ioctl. But Paul, does
it look ok otherwise?

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