[Nbd] [PATCH 3/3] NBD proto: add "Command flags" section
From: Pavel Borzenkov <pborzenkov@...2319...>
Add separate "Command flags" section to make it clear which flags are
currently defined by the protocol.
Signed-off-by: Pavel Borzenkov <pborzenkov@...2319...>
Reviewed-by: Roman Kagan <rkagan@...2319...>
Signed-off-by: Denis V. Lunev <den@...2317...>
CC: Wouter Verhelst <w@...112...>
CC: Eric Blake <eblake@...696...>
CC: Alex Bligh <alex@...872...>
---
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
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