linux-kernel - Re: [PATCH 3/3] nbd: mark sock as dead even if it's the last one

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Message-ID: <20190524131714.i3lbkbokad6xmotv@MacBook-Pro-91.local.dhcp.thefacebook.com>
Date:   Fri, 24 May 2019 09:17:15 -0400
From:   Josef Bacik <josef@...icpanda.com>
To:     Yao Liu <yotta.liu@...oud.cn>
Cc:     Josef Bacik <josef@...icpanda.com>, Jens Axboe <axboe@...nel.dk>,
        linux-block@...r.kernel.org, nbd@...er.debian.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] nbd: mark sock as dead even if it's the last one

On Fri, May 24, 2019 at 05:43:56PM +0800, Yao Liu wrote:
> When sock dead, nbd_read_stat should return a ERR_PTR and then we should
> mark sock as dead and wait for a reconnection if the dead sock is the last
> one, because nbd_xmit_timeout won't resubmit while num_connections <= 1.

num_connections is the total number of connections that the device was set up
with, not how many are left.  Now since we have the dead_conn_timeout timeout
stuff now which didn't exist when I originally wrote this code I'd be ok with
doing that, but not the way you have it now.  It would be something more like

	if (nbd_disconnected(config) ||
	    (config->num_connections <= 1 &&
	     !config->dead_conn_timeout)

instead.  Thanks,

Josef