linux-kernel - Re: [PATCH 10/30] cr: core stuff

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Message-Id: <1239723694.32604.62.camel@nimitz>
Date:	Tue, 14 Apr 2009 08:41:34 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	"Serge E. Hallyn" <serue@...ibm.com>, akpm@...ux-foundation.org,
	containers@...ts.linux-foundation.org, xemul@...allels.com,
	mingo@...e.hu, orenl@...columbia.edu, hch@...radead.org,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/30] cr: core stuff

On Tue, 2009-04-14 at 19:27 +0400, Alexey Dobriyan wrote:
> > Also, since Dave introduced the fops->checkpoint(), we (or at least I)
> > have been struck by the ugly assymetry with checkpoint() being in fops,
> > and restart() not.  Do you have an idea for fixing that?
> 
> Module can legally support C/R for its files.
> 
> In the end it most certainly will end up with module registering restart
> hook for file type N.
> 
> Or module registering hook to restart object type N.

Yeah, that was my expectation as well.  There's a point when we just
have too many kinds of checkpoint objects and the switch statements get
out of hand.  Oversimplified, of course, but:

	init_restart_handler(CR_FD_GENERIC, restore_generic_fd);
	init_restart_handler(CR_FD_SOCKET, restore_socket);
	init_restart_handler(CR_FD_PIPE, restore_pipe);

The only question to me is whether we allow the handler functions to do
further reading of the checkpoint image or whether the higher-level code
should be feeding them all the data they'll need in some way.

-- Dave

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