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From: Eric Blake <eblake@redhat.com>
To: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>,
	qemu-devel@nongnu.org, qemu-block@nongnu.org
Cc: kwolf@redhat.com, den@openvz.org, armbru@redhat.com,
	stefanha@redhat.com, mreitz@redhat.com
Subject: Re: [Qemu-devel] [PATCH v7 3/9] block/nbd: move from quit to state
Date: Wed, 7 Aug 2019 21:01:40 -0500	[thread overview]
Message-ID: <c6fdfabd-7982-8608-559e-5a2c54d32ebb@redhat.com> (raw)
In-Reply-To: <20190618114328.55249-4-vsementsov@virtuozzo.com>


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On 6/18/19 6:43 AM, Vladimir Sementsov-Ogievskiy wrote:
> To implement reconnect we need several states for the client:
> CONNECTED, QUIT and two different CONNECTING states. CONNECTING states
> will be added in the following patches. This patch implements CONNECTED
> and QUIT.
> 
> QUIT means, that we should close the connection and fail all current
> and further requests (like old quit = true).
> 
> CONNECTED means that connection is ok, we can send requests (like old
> quit = false).
> 
> For receiving loop we use a comparison of the current state with QUIT,
> because reconnect will be in the same loop, so it should be looping
> until the end.
> 
> Opposite, for requests we use a comparison of the current state with
> CONNECTED, as we don't want to send requests in future CONNECTING
> states.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> Reviewed-by: Eric Blake <eblake@redhat.com>
> ---
>  block/nbd.c | 58 ++++++++++++++++++++++++++++++++++-------------------
>  1 file changed, 37 insertions(+), 21 deletions(-)

> @@ -556,7 +572,7 @@ static coroutine_fn int nbd_co_do_receive_one_chunk(
>      s->requests[i].receiving = true;
>      qemu_coroutine_yield();
>      s->requests[i].receiving = false;
> -    if (s->quit) {
> +    if (s->state != NBD_CLIENT_CONNECTED) {
>          error_setg(errp, "Connection closed");
>          return -EIO;
>      }
> @@ -640,7 +656,7 @@ static coroutine_fn int nbd_co_receive_one_chunk(
>                                            request_ret, qiov, payload, errp);
>  
>      if (ret < 0) {
> -        s->quit = true;
> +        nbd_channel_error(s, ret);

Minor merge conflict with changes in the meantime; easy enough to sort out.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org


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  reply	other threads:[~2019-08-08  2:02 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-18 11:43 [Qemu-devel] [PATCH v7 0/9] NBD reconnect Vladimir Sementsov-Ogievskiy
2019-06-18 11:43 ` [Qemu-devel] [PATCH v7 1/9] block/nbd: split connection_co start out of nbd_client_connect Vladimir Sementsov-Ogievskiy
2019-06-18 11:43 ` [Qemu-devel] [PATCH v7 2/9] block/nbd: use non-blocking io channel for nbd negotiation Vladimir Sementsov-Ogievskiy
2019-06-18 11:43 ` [Qemu-devel] [PATCH v7 3/9] block/nbd: move from quit to state Vladimir Sementsov-Ogievskiy
2019-08-08  2:01   ` Eric Blake [this message]
2019-06-18 11:43 ` [Qemu-devel] [PATCH v7 4/9] block/nbd: add cmdline and qapi parameter reconnect-delay Vladimir Sementsov-Ogievskiy
2019-08-08  2:03   ` Eric Blake
2019-06-18 11:43 ` [Qemu-devel] [PATCH v7 5/9] block/nbd: refactor nbd connection parameters Vladimir Sementsov-Ogievskiy
2019-08-09 15:12   ` Eric Blake
2019-06-18 11:43 ` [Qemu-devel] [PATCH v7 6/9] qemu-coroutine-sleep: introduce qemu_co_sleep_wake Vladimir Sementsov-Ogievskiy
2019-06-18 11:43 ` [Qemu-devel] [PATCH v7 7/9] qemu/units: add SI decimal units Vladimir Sementsov-Ogievskiy
2019-08-09 15:39   ` Eric Blake
2019-08-09 15:56     ` Peter Maydell
2019-06-18 11:43 ` [Qemu-devel] [PATCH v7 8/9] block/nbd: nbd reconnect Vladimir Sementsov-Ogievskiy
2019-06-18 11:43 ` [Qemu-devel] [PATCH v7 9/9] iotests: test " Vladimir Sementsov-Ogievskiy
2019-07-25 10:07 ` [Qemu-devel] [PATCH v7 0/9] NBD reconnect Vladimir Sementsov-Ogievskiy
2019-08-21 11:41   ` Vladimir Sementsov-Ogievskiy
2019-08-21 14:47     ` Eric Blake

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