From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48351) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1akUeE-0007WA-4v for qemu-devel@nongnu.org; Mon, 28 Mar 2016 06:43:51 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1akUeB-0002c5-G0 for qemu-devel@nongnu.org; Mon, 28 Mar 2016 06:43:50 -0400 Received: from mailhub.sw.ru ([195.214.232.25]:23030 helo=relay.sw.ru) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1akUeB-0002an-3o for qemu-devel@nongnu.org; Mon, 28 Mar 2016 06:43:47 -0400 From: "Denis V. Lunev" Date: Mon, 28 Mar 2016 13:43:18 +0300 Message-Id: <1459161798-32120-4-git-send-email-den@openvz.org> In-Reply-To: <1459161798-32120-1-git-send-email-den@openvz.org> References: <1459161798-32120-1-git-send-email-den@openvz.org> Subject: [Qemu-devel] [PATCH 3/3] NBD proto: add "Command flags" section List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: nbd-general@lists.sourceforge.net, qemu-devel@nongnu.org Cc: den@openvz.org, Pavel Borzenkov , Alex Bligh , Wouter Verhelst From: Pavel Borzenkov Add separate "Command flags" section to make it clear which flags are currently defined by the protocol. Signed-off-by: Pavel Borzenkov Reviewed-by: Roman Kagan Signed-off-by: Denis V. Lunev CC: Wouter Verhelst CC: Eric Blake CC: Alex Bligh --- doc/proto.md | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/doc/proto.md b/doc/proto.md index 036d6d9..662f741 100644 --- a/doc/proto.md +++ b/doc/proto.md @@ -485,6 +485,16 @@ The following request types exist: Currently one such message is known: `NBD_CMD_CACHE`, with type set to 5, implemented by xnbd. +#### Command flags + +This field of 16 bits is sent by the client with every request and provides +additional information to the server to execute the command. Refer to +aforementioned "Request types" section for information about the flags +supported by particular commands. + +- bit 0, `NBD_CMD_FLAG_FUA`; should be set to 1 if the client requires + "Force Unit Access" mode of operation + #### Error values The error values are used for the error field in the reply message. -- 2.1.4