[Qemu-devel] [PATCH v3] QMP: add snapshot_blkdev command

[Jes.Sorensen@redhat.com]

From: Jes Sorensen <Jes.Sorensen@redhat.com>

Add QMP bits for snapshot_blkdev command. This is the same as
snapshot_blkdev in the human monitor. The command is synchronous. In
the future async commands may be added with the name _async/-async.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
---
 qmp-commands.hx |   38 ++++++++++++++++++++++++++++++++++++++
 1 files changed, 38 insertions(+), 0 deletions(-)

diff --git a/qmp-commands.hx b/qmp-commands.hx
index fbd98ee..24e9c3e 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -667,6 +667,44 @@ Example:
 EQMP
 
     {
+        .name       = "blockdev-snapshot",
+        .args_type  = "device:B,snapshot_file:s?,format:s?",
+        .params     = "device [new-image-file] [format]",
+        .help       = "initiates a live snapshot\n\t\t\t"
+                      "of device. If a new image file is specified, the\n\t\t\t"
+                      "new image file will become the new root image.\n\t\t\t"
+                      "If format is specified, the snapshot file will\n\t\t\t"
+                      "be created in that format. Otherwise the\n\t\t\t"
+                      "snapshot will be internal! (currently unsupported)",
+        .user_print = monitor_user_noop,
+        .mhandler.cmd_new = do_snapshot_blkdev,
+    },
+
+SQMP
+blockdev-snapshot-sync
+----------------------
+
+Synchronous snapshot of block device, using snapshot file as target,
+if provided. 
+
+Arguments:
+
+- "device": device name to snapshot (json-string)
+- "snapshot_file": name of new image file (json-string)
+- "format": format of now image (json-string)
+
+Example:
+
+-> { "execute": "blockdev-snapshot", "arguments": { "device": "ide-hd0",
+                                                    "snapshot_file":
+                                                    "/some/place/my-image",
+						    "format": "qcow2"
+                                                   } }
+<- { "return": {} }
+
+EQMP
+
+    {
         .name       = "balloon",
         .args_type  = "value:M",
         .params     = "target",
-- 
1.7.4.4