From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
To: Eric Blake <eblake@redhat.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Cc: Kevin Wolf <kwolf@redhat.com>,
"nbd@other.debian.org" <nbd@other.debian.org>,
"libguestfs@redhat.com" <libguestfs@redhat.com>,
"open list:Network Block Dev..." <qemu-block@nongnu.org>,
Max Reitz <mreitz@redhat.com>
Subject: Re: [Qemu-devel] [PATCH 2/5] nbd: Prepare for NBD_CMD_FLAG_FAST_ZERO
Date: Sat, 31 Aug 2019 08:20:00 +0000 [thread overview]
Message-ID: <ca606ce7-90ec-591c-ffb4-6b4f5618bcd8@virtuozzo.com> (raw)
In-Reply-To: <20190823143726.27062-3-eblake@redhat.com>
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<eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
--
Best regards,
Vladimir
next prev parent reply other threads:[~2019-08-31 8:20 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-23 14:30 [Qemu-devel] cross-project patches: Add NBD Fast Zero support Eric Blake
2019-08-23 14:34 ` [Qemu-devel] [PATCH 0/1] NBD protocol change to add fast zero support Eric Blake
2019-08-23 14:34 ` [Qemu-devel] [PATCH 1/1] protocol: Add NBD_CMD_FLAG_FAST_ZERO Eric Blake
2019-08-23 18:48 ` Wouter Verhelst
2019-08-23 18:58 ` Eric Blake
2019-08-24 6:44 ` Wouter Verhelst
2019-08-28 9:57 ` Vladimir Sementsov-Ogievskiy
2019-08-28 13:04 ` Eric Blake
2019-08-28 13:45 ` Vladimir Sementsov-Ogievskiy
2019-09-03 20:53 ` [Qemu-devel] [Libguestfs] [PATCH 0/1] NBD protocol change to add fast zero support Eric Blake
2019-08-23 14:37 ` [Qemu-devel] [PATCH 0/5] Add NBD fast zero support to qemu client and server Eric Blake
2019-08-23 14:37 ` [Qemu-devel] [PATCH 1/5] nbd: Improve per-export flag handling in server Eric Blake
2019-08-30 18:00 ` Vladimir Sementsov-Ogievskiy
2019-08-30 23:10 ` Eric Blake
2019-08-30 23:32 ` Eric Blake
2019-09-03 16:39 ` Eric Blake
2019-09-04 17:08 ` Vladimir Sementsov-Ogievskiy
2019-08-23 14:37 ` [Qemu-devel] [PATCH 2/5] nbd: Prepare for NBD_CMD_FLAG_FAST_ZERO Eric Blake
2019-08-30 18:07 ` Vladimir Sementsov-Ogievskiy
2019-08-30 23:37 ` Eric Blake
2019-08-31 8:11 ` Vladimir Sementsov-Ogievskiy
2019-09-03 18:49 ` Eric Blake
2019-08-31 8:20 ` Vladimir Sementsov-Ogievskiy [this message]
2019-08-23 14:37 ` [Qemu-devel] [PATCH 3/5] nbd: Implement client use of NBD FAST_ZERO Eric Blake
2019-08-30 18:11 ` Vladimir Sementsov-Ogievskiy
2019-08-23 14:37 ` [Qemu-devel] [PATCH 4/5] nbd: Implement server " Eric Blake
2019-08-30 18:40 ` Vladimir Sementsov-Ogievskiy
2019-08-23 14:37 ` [Qemu-devel] [PATCH 5/5] nbd: Tolerate more errors to structured reply request Eric Blake
2019-08-23 16:41 ` Eric Blake
2019-08-28 13:55 ` [Qemu-devel] [PATCH 0/5] Add NBD fast zero support to qemu client and server Vladimir Sementsov-Ogievskiy
2019-08-28 14:05 ` Eric Blake
2019-08-23 14:38 ` [Qemu-devel] [libnbd PATCH 0/1] libnbd support for new fast zero Eric Blake
2019-08-23 14:38 ` [Qemu-devel] [libnbd PATCH 1/1] api: Add support for FAST_ZERO flag Eric Blake
2019-08-27 12:25 ` [Qemu-devel] [Libguestfs] " Richard W.M. Jones
2019-08-23 14:40 ` [Qemu-devel] [nbdkit PATCH 0/3] nbdkit support for new NBD fast zero Eric Blake
2019-08-23 14:40 ` [Qemu-devel] [nbdkit PATCH 1/3] server: Add internal support for NBDKIT_FLAG_FAST_ZERO Eric Blake
2019-08-23 14:40 ` [Qemu-devel] [nbdkit PATCH 2/3] filters: Add .can_fast_zero hook Eric Blake
2019-08-23 14:40 ` [Qemu-devel] [nbdkit PATCH 3/3] plugins: " Eric Blake
2019-08-23 21:16 ` [Qemu-devel] [Libguestfs] " Eric Blake
2019-08-27 15:43 ` Richard W.M. Jones
2019-08-23 15:05 ` [Qemu-devel] cross-project patches: Add NBD Fast Zero support Vladimir Sementsov-Ogievskiy
2019-08-27 12:14 ` [Qemu-devel] [Libguestfs] " Richard W.M. Jones
2019-08-27 13:23 ` Eric Blake
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