Re: [PATCH] Allow NBD to be used locally

[Laurent Vivier]

Le samedi 02 fÃvrier 2008 Ã 12:23 +0100, Pavel Machek a Ãcrit :
> On Fri 2008-02-01 14:25:32, Laurent Vivier wrote:
> > This patch allows Network Block Device to be mounted locally.
> 
> What is local nbd good for? Use loop instead...

It allows to write userlevel block device. In my case, I can mount disk
image of Qemu (qcow2, vmdk, ...).

> > It creates a kthread to avoid the deadlock described in NBD tools documentation.
> > So, if nbd-client hangs waiting pages, the kblockd thread can continue its
> > work and free pages.
> 
> Hmm, and if there are no other pages that can be freed? Unlikely, but
> can happen AFAICT.

Correct. The patch improves the NBD behavior even if it is not perfect.
And I think if no other page can be freed your system is in very bad
move ;-)

Laurent
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