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[Qemu-devel] [PATCH v5 6/6] docs/interop: add nbd.txt
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[Qemu-devel] [PATCH v5 6/6] docs/interop: add nbd.txt |
Date: |
Sat, 9 Jun 2018 18:17:58 +0300 |
Describe new metadata namespace: "qemu".
Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
---
docs/interop/nbd.txt | 37 +++++++++++++++++++++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 38 insertions(+)
create mode 100644 docs/interop/nbd.txt
diff --git a/docs/interop/nbd.txt b/docs/interop/nbd.txt
new file mode 100644
index 0000000000..7366269fc0
--- /dev/null
+++ b/docs/interop/nbd.txt
@@ -0,0 +1,37 @@
+Qemu supports NBD protocol, and has internal NBD client (look at
+block/nbd.c), internal NBD server (look at blockdev-nbd.c) as well as
+external NBD server tool - qemu-nbd.c. The common code is placed in
+nbd/*.
+
+NBD protocol is specified here:
+https://github.com/NetworkBlockDevice/nbd/blob/master/doc/proto.md
+
+This following paragraphs describe some specific properties of NBD
+protocol realization in Qemu.
+
+
+= Metadata namespaces =
+
+Qemu supports "base:allocation" metadata context as defined in the NBD
+protocol specification and defines own metadata namespace: "qemu".
+
+
+== "qemu" namespace ==
+
+For now, the only type of metadata context in the namespace is dirty
+bitmap. All available metadata contexts have the following form:
+
+ qemu:dirty-bitmap:<dirty-bitmap-export-name>
+
+Each dirty-bitmap metadata context defines the only one flag for
+extents in reply for NBD_CMD_BLOCK_STATUS:
+
+ bit 0: NBD_STATE_DIRTY, means that the extent is "dirty"
+
+For NBD_OPT_LIST_META_CONTEXT the following queries are supported
+additionally to "qemu:dirty-bitmap:<dirty-bitmap-export-name>":
+
+* "qemu:" : returns list of all available metadata contexts in the
+ namespace.
+* "qemu:dirty-bitmap:" : returns list of all available dirty-bitmap
+ metadata contexts.
diff --git a/MAINTAINERS b/MAINTAINERS
index e187b1f18f..887b479440 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1923,6 +1923,7 @@ F: nbd/
F: include/block/nbd*
F: qemu-nbd.*
F: blockdev-nbd.c
+F: docs/interop/nbd.txt
T: git git://repo.or.cz/qemu/ericb.git nbd
NFS
--
2.11.1
[Qemu-devel] [PATCH v5 3/6] nbd/server: add nbd_meta_empty_or_pattern helper, Vladimir Sementsov-Ogievskiy, 2018/06/09
[Qemu-devel] [PATCH v5 5/6] qapi: new qmp command nbd-server-add-bitmap, Vladimir Sementsov-Ogievskiy, 2018/06/09