netdev - Re: [PATCH 1/2] c/r: Add AF

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Message-ID: <8763e3qfl9.fsf@caffeine.danplanet.com>
Date:	Wed, 08 Jul 2009 09:55:46 -0700
From:	Dan Smith <danms@...ibm.com>
To:	Oren Laadan <orenl@...columbia.edu>
Cc:	containers@...ts.osdl.org, netdev@...r.kernel.org,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [PATCH 1/2] c/r: Add AF_UNIX support (v5)

OL> It will mostly fix the buffer limits, but not entirely: if the
OL> original socket first raised the limits above defualt, then sent
OL> data (not read by peer), then you'll still need to adjust the
OL> limit before restoring the buffers.

If we cap the buffers in the checkpoint image to the current system
limit (sysctl) and then set the per-socket buffer limit (after reading
them in) to the value in the checkpoint image then we get the desired
result, right?

OL> I can't predict the future, but it's been there forever...

Yeah, after I sent that I remembered that the magic 108 is in the
sockaddr_un structure which is a userspace API and therefore not
likely to change.

OL> But the point is that I would interpret ENOSPC as "storage/space
OL> is exhausted", while here the error is that this value is simply
OL> invalid for the particular kernel on which the restart occurs.

Yep, fair enough.

OL> In the original system, once the file becomes unreachable it
OL> cannot be made reachable again by simple (re)mounting, IOW it can
OL> no longer be connected-to.

Ah, I thought you meant "was reachable on the source system and not
reachable on the target system".  I'm with you now :)

-- 
Dan Smith
IBM Linux Technology Center
email: danms@...ibm.com
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