linux-kernel - [PATCH 1/1] NBD: allow nbd to be used locally

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Message-ID: <47D468F0.8000506@steeleye.com>
Date:	Sun, 09 Mar 2008 18:47:12 -0400
From:	Paul Clements <paul.clements@...eleye.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org, nbd-general@...ts.sourceforge.net,
	Laurent Vivier <Laurent.Vivier@...l.net>
Subject: [PATCH 1/1] NBD: allow nbd to be used locally

This patch allows a Network Block Device to be mounted locally 
(nbd-client to nbd-server over 127.0.0.1).

It creates a kthread to avoid the deadlock described in NBD tools 
documentation. So, if nbd-client hangs waiting for pages, the kblockd 
thread can continue its work and free pages.

I have tested the patch to verify that it avoids the hang that occurs 
when writing to a localhost nbd connection. I have also tested to verify 
that no performance degradation results from the additional thread and 
queue.

Patch originally from Laurent Vivier.

Thanks,
Paul

View attachment "nbd_local.diff" of type "text/x-patch" (6328 bytes)