[Qemu-devel] [PATCH V2 08/12] qmp: add interface blockdev-snapshot-internal-sync

[Wenchao Xia]

This interface can generate snapshot name automatically if it is not
specified, since it is a single opertion.

Snapshot ID can't be specified in this interface.

Signed-off-by: Wenchao Xia <address@hidden>
---
 blockdev.c       |   25 +++++++++++++++++++++++++
 qapi-schema.json |   23 +++++++++++++++++++++++
 qmp-commands.hx  |   31 +++++++++++++++++++++++++++++++
 3 files changed, 79 insertions(+), 0 deletions(-)

diff --git a/blockdev.c b/blockdev.c
index aaeb0e8..6a952cd 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -777,6 +777,31 @@ void qmp_blockdev_snapshot_sync(const char *device, const 
char *snapshot_file,
                        &snapshot, errp);
 }
 
+void qmp_blockdev_snapshot_internal_sync(const char *device,
+                                         bool has_name, const char *name,
+                                         Error **errp)
+{
+    qemu_timeval tv;
+    struct tm tm;
+    char name1[128];
+
+    BlockdevSnapshotInternal snapshot = {
+        .device = (char *) device,
+    };
+
+    if (has_name) {
+        snapshot.name = (char *) name;
+    } else {
+        qemu_gettimeofday(&tv);
+        localtime_r((const time_t *)&tv.tv_sec, &tm);
+        strftime(name1, sizeof(name1), "vm-%Y%m%d%H%M%S", &tm);
+        snapshot.name = name1;
+    }
+
+    blockdev_do_action(TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
+                       &snapshot, errp);
+}
+
 
 /* New and old BlockDriverState structs for group snapshots */
 
diff --git a/qapi-schema.json b/qapi-schema.json
index c53cb31..749a349 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -1689,6 +1689,29 @@
             '*mode': 'NewImageMode'} }
 
 ##
+# @blockdev-snapshot-internal-sync
+#
+# Synchronously take an internal snapshot of a block device, when the format
+# of the image used supports it.
+#
+# @device: the name of the device to generate the snapshot from
+#
+# @name: #optional the new snapshot name. If not specified, a name will be
+# generated according to time by qemu
+#
+# Returns: nothing on success
+#          If @device is not a valid block device, DeviceNotFound
+#          If any snapshot matching @name exists, or the name is a numeric
+#          which may mess up with snapshot ID, generic error will be returned
+#          If the format of the image used does not support it,
+#          BlockFormatFeatureNotSupported
+#
+# Since 1.6
+##
+{ 'command': 'blockdev-snapshot-internal-sync',
+  'data': { 'device': 'str', '*name': 'str'} }
+
+##
 # @human-monitor-command:
 #
 # Execute a command on the human monitor and return the output.
diff --git a/qmp-commands.hx b/qmp-commands.hx
index db5d4e3..3d5f996 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -1044,6 +1044,37 @@ Example:
 EQMP
 
     {
+        .name       = "blockdev-snapshot-internal-sync",
+        .args_type  = "device:B,name:s?",
+        .mhandler.cmd_new = qmp_marshal_input_blockdev_snapshot_internal_sync,
+    },
+
+SQMP
+blockdev-snapshot-internal-sync
+-------------------------------
+
+Synchronously take an internal snapshot of a block device when the format of
+image used supports it.  If name is not specified, it will be automatically
+generated by qemu according to host time.  If the name is a numeric string
+which may mess up with ID, such as "19", the operation will fail.  If a
+snapshot with name already exists, the operation will fail.
+
+Arguments:
+
+- "device": device name to snapshot (json-string)
+- "name": name of the new snapshot (json-string, optional)
+
+Example:
+
+-> { "execute": "blockdev-snapshot-internal-sync",
+                "arguments": { "device": "ide-hd0",
+                               "name": "snapshot0" }
+   }
+<- { "return": {} }
+
+EQMP
+
+    {
         .name       = "drive-mirror",
         .args_type  = "sync:s,device:B,target:s,speed:i?,mode:s?,format:s?,"
                       "on-source-error:s?,on-target-error:s?,"
-- 
1.7.1