From: Pavel Machek <pavel@suse.cz>
Date: Thu, 2 Apr 2009 23:58:41 +0000 (-0700)
Subject: nbd: add locking to nbd_ioctl
X-Git-Tag: v2.6.30-rc1~308
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1a2ad21128bb4eb79f3c05e5801edcc5ed3ef1d3;p=pandora-kernel.git

nbd: add locking to nbd_ioctl

The code was written to rely on big kernel lock to protect it from races.
It mostly works when interface is not abused.

So this uses tx_lock to protect data structures from concurrent use
between ioctl and worker threads.

Next step will be moving from ioctl to unlocked_ioctl.

[akpm@linux-foundation.org: coding-style fixes]
[akpm@linux-foundation.org: add missing return]
Signed-off-by: Pavel Machek <pavel@suse.cz>
Acked-by: Paul Clements <paul.clements@steeleye.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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