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From: Eric Blake <eblake@redhat.com>
To: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>,
	qemu-block@nongnu.org
Cc: fam@euphon.net, kwolf@redhat.com, qemu-devel@nongnu.org,
	mreitz@redhat.com, stefanha@redhat.com, den@openvz.org,
	jsnow@redhat.com
Subject: Re: [PATCH 03/11] block/raw-format: implement .bdrv_cancel_in_flight handler
Date: Wed, 20 Jan 2021 17:15:34 -0600	[thread overview]
Message-ID: <0484adfa-2822-dfd6-b311-e947892d7376@redhat.com> (raw)
In-Reply-To: <20201118180433.11931-4-vsementsov@virtuozzo.com>

On 11/18/20 12:04 PM, Vladimir Sementsov-Ogievskiy wrote:
> We are going to cancel in-flight requests on mirror nbd target on job
> cancel. Still nbd is often used not directly but as raw-format child.
> So, add pass-through handler here.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> ---
>  block/raw-format.c | 6 ++++++
>  1 file changed, 6 insertions(+)

Should all filters do this automatically (or rather, should the block
layer do this automatically for all filters)?  But I understand that it
does NOT make sense for format drivers in general (cancelling a guest
request may still require metadata updates), where raw-format is the
exception, so doing it in raw-format instead of the block layer makes sense.


>  BlockDriver bdrv_raw = {
>      .format_name          = "raw",
>      .instance_size        = sizeof(BDRVRawState),
> @@ -608,6 +613,7 @@ BlockDriver bdrv_raw = {
>      .bdrv_has_zero_init   = &raw_has_zero_init,
>      .strong_runtime_opts  = raw_strong_runtime_opts,
>      .mutable_opts         = mutable_opts,
> +    .bdrv_cancel_in_flight = raw_cancel_in_flight,

A demonstration of why I don't like aligning the =.  But it's merely
cosmetic, so doesn't affect:

Reviewed-by: Eric Blake <eblake@redhat.com>

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



  reply	other threads:[~2021-01-20 23:17 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-18 18:04 [PATCH 00/11] mirror: cancel nbd reconnect Vladimir Sementsov-Ogievskiy
2020-11-18 18:04 ` [PATCH 01/11] block: add new BlockDriver handler: bdrv_cancel_in_flight Vladimir Sementsov-Ogievskiy
2021-01-20 22:27   ` Eric Blake
2021-01-21 18:50     ` Vladimir Sementsov-Ogievskiy
2020-11-18 18:04 ` [PATCH 02/11] block/nbd: implement .bdrv_cancel_in_flight Vladimir Sementsov-Ogievskiy
2021-01-20 23:13   ` Eric Blake
2020-11-18 18:04 ` [PATCH 03/11] block/raw-format: implement .bdrv_cancel_in_flight handler Vladimir Sementsov-Ogievskiy
2021-01-20 23:15   ` Eric Blake [this message]
2021-01-21 19:08     ` Vladimir Sementsov-Ogievskiy
2020-11-18 18:04 ` [PATCH 04/11] job: add .cancel handler for the driver Vladimir Sementsov-Ogievskiy
2021-01-20 23:17   ` Eric Blake
2021-01-21  9:32     ` Vladimir Sementsov-Ogievskiy
2020-11-18 18:04 ` [PATCH 05/11] block/mirror: implement .cancel job handler Vladimir Sementsov-Ogievskiy
2021-01-21  1:05   ` Eric Blake
2020-11-18 18:04 ` [PATCH 06/11] iotests/264: fix style Vladimir Sementsov-Ogievskiy
2021-01-21  1:13   ` Eric Blake
2020-11-18 18:04 ` [PATCH 07/11] iotests/264: move to python unittest Vladimir Sementsov-Ogievskiy
2021-01-21  1:17   ` Eric Blake
2021-01-21 19:29     ` Vladimir Sementsov-Ogievskiy
2020-11-18 18:04 ` [PATCH 08/11] iotests.py: qemu_nbd_popen: remove pid file after use Vladimir Sementsov-Ogievskiy
2021-01-21  1:19   ` Eric Blake
2020-11-18 18:04 ` [PATCH 09/11] iotests/264: add mirror-cancel test-case Vladimir Sementsov-Ogievskiy
2021-01-21  1:26   ` Eric Blake
2021-01-21 19:42     ` Vladimir Sementsov-Ogievskiy
2020-11-18 18:04 ` [PATCH 10/11] block/backup: implement .cancel job handler Vladimir Sementsov-Ogievskiy
2021-01-21  1:27   ` Eric Blake
2020-11-18 18:04 ` [PATCH 11/11] iotests/264: add backup-cancel test-case Vladimir Sementsov-Ogievskiy
2021-01-21  1:28   ` Eric Blake
2021-01-21  2:21     ` Eric Blake
2021-01-21 19:43       ` Vladimir Sementsov-Ogievskiy
2020-11-18 18:19 ` [PATCH 00/11] mirror: cancel nbd reconnect Eric Blake
2020-11-18 18:36   ` Vladimir Sementsov-Ogievskiy
2020-12-18 11:05 ` Vladimir Sementsov-Ogievskiy
2021-01-09 10:11   ` Vladimir Sementsov-Ogievskiy
2021-01-21  2:14 ` Eric Blake
2021-01-21 19:44   ` Vladimir Sementsov-Ogievskiy

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