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Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] nbd: Prepare for NBD_CMD_FLAG_
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] nbd: Prepare for NBD_CMD_FLAG_FAST_ZERO |
Date: |
Sat, 31 Aug 2019 08:20:00 +0000 |
23.08.2019 17:37, Eric Blake wrote:
> Commit fe0480d6 and friends added BDRV_REQ_NO_FALLBACK as a way to
> avoid wasting time on a preliminary write-zero request that will later
> be rewritten by actual data, if it is known that the write-zero
> request will use a slow fallback; but in doing so, could not optimize
> for NBD. The NBD specification is now considering an extension that
> will allow passing on those semantics; this patch updates the new
> protocol bits and 'qemu-nbd --list' output to recognize the bit, as
> well as the new errno value possible when using the new flag; while
> upcoming patches will improve the client to use the feature when
> present, and the server to advertise support for it.
>
> Signed-off-by: Eric Blake<address@hidden>
Reviewed-by: Vladimir Sementsov-Ogievskiy <address@hidden>
--
Best regards,
Vladimir
- [Qemu-block] [PATCH 1/5] nbd: Improve per-export flag handling in server, (continued)
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Re: [Qemu-block] [Qemu-devel] [PATCH 2/5] nbd: Prepare for NBD_CMD_FLAG_FAST_ZERO,
Vladimir Sementsov-Ogievskiy <=
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[Qemu-block] [libnbd PATCH 0/1] libnbd support for new fast zero, Eric Blake, 2019/08/23
[Qemu-block] [nbdkit PATCH 0/3] nbdkit support for new NBD fast zero, Eric Blake, 2019/08/23