[Qemu-devel] [PATCH V3 06/11] qmp: add interface query-images.

[Wenchao Xia <xiawenc@linux.vnet.ibm.com>]

  This mirror function will return all image info including
snapshots. Now Qemu have both query-images and query-block
interfaces.

Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
---
 block.c          |   19 +++++++++++++
 qapi-schema.json |   27 +++++++++++++++++++
 qmp-commands.hx  |   76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 122 insertions(+), 0 deletions(-)

diff --git a/block.c b/block.c
index 502c06e..8192d8e 100644
--- a/block.c
+++ b/block.c
@@ -2963,6 +2963,25 @@ ImageInfo *bdrv_query_image_info(BlockDriverState *bs, Error **errp)
     return info;
 }
 
+DeviceImageInfoList *qmp_query_images(Error **errp)
+{
+    DeviceImageInfoList *head = NULL, **p_next = &head;
+    BlockDriverState *bs;
+
+    QTAILQ_FOREACH(bs, &bdrv_states, list) {
+        DeviceImageInfo *dii = g_malloc0(sizeof(*dii));
+        dii->device = g_strdup(bs->device_name);
+        dii->info = bdrv_query_image_info(bs, NULL);
+        DeviceImageInfoList *diil = g_malloc0(sizeof(*diil));
+        diil->value = dii;
+
+        *p_next = diil;
+        p_next = &diil->next;
+    }
+
+    return head;
+}
+
 BlockInfo *bdrv_query_block_info(BlockDriverState *bs)
 {
     BlockInfo *info = g_malloc0(sizeof(*info));
diff --git a/qapi-schema.json b/qapi-schema.json
index 5dfa052..565737c 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -245,6 +245,22 @@
            '*backing-filename-format': 'str', '*snapshots': ['SnapshotInfo'] } }
 
 ##
+# @DeviceImageInfo:
+#
+# Information about an image used by QEMU block device
+#
+# @device: name of the block device
+#
+# @info: info of the image used.
+#
+# Since: 1.4
+#
+##
+
+{ 'type': 'DeviceImageInfo',
+  'data': {'device': 'str', 'info': 'ImageInfo' } }
+
+##
 # @StatusInfo:
 #
 # Information about VCPU run state
@@ -720,6 +736,17 @@
 { 'command': 'query-block', 'returns': ['BlockInfo'] }
 
 ##
+# @query-images:
+#
+# Get a list of DeviceImageInfo for all virtual block devices.
+#
+# Returns: a list of @DeviceImageInfo describing each virtual block device
+#
+# Since: 1.4
+##
+{ 'command': 'query-images', 'returns': ['DeviceImageInfo'] }
+
+##
 # @BlockDeviceStats:
 #
 # Statistics of a virtual block device or a block backing device.
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 5c692d0..c31a142 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -1668,6 +1668,82 @@ EQMP
     },
 
 SQMP
+query-images
+-----------
+
+Show the block devices' images.
+
+Each block image information is stored in a json-object and the returned value
+is a json-array of all devices' images.
+
+Each json-object contain the following:
+
+- "device": device name (json-string)
+- "info": related image information, it is a json-object containing the following:
+         - "filename": image file name (json-string)
+         - "format": image format (json-string)
+         - "virtual-size": maximum capacity in bytes of the image (json-int)
+         - "dirty-flag": true if image is not cleanly closed (json-bool, optional)
+         - "actual-size": actual size on disk in bytes of the image (json-int, optional)
+         - "cluster-size": size of a cluster in bytes (json-int, optional)
+         - "encrypted": true if the image is encrypted (json-bool, optional)
+         - "backing_file": backing file name (json-string, optional)
+         - "full-backing-filename": full path of the backing file (json-string, optional)
+         - "backing-filename-format": the format of the backing file (json-string, optional)
+         - "snapshots": the internal snapshot info, it is an optional list of json-object
+            containing the following:
+             - "id": unique snapshot id (json-string)
+             - "name": internal snapshot name (json-string)
+             - "vm-state-size": size of the VM state in bytes (json-int)
+             - "date-sec": UTC date of the snapshot in seconds (json-int)
+             - "date-nsec": fractional part in nano seconds to be used with date-sec(json-int)
+             - "vm-clock-sec": VM clock relative to boot in seconds (json-int)
+             - "vm-clock-nsec": fractional part in nano seconds to be used with vm-clock-sec (json-int)
+
+Example:
+
+-> { "execute": "query-images" }
+<- {
+      "return":[
+         {
+            "device":"ide0-hd0",
+            "info":{
+               "filename":"disks/test0.img",
+               "format":"qcow2",
+               "virtual-size":1024000
+            }
+         },
+         {
+            "device":"ide0-hd1",
+            "info":{
+               "filename":"disks/test1.img",
+               "format":"qcow2",
+               "virtual-size":2048000,
+               "snapshots":[
+                  {
+                     "id": "1",
+                     "name": "snapshot1",
+                     "vm-state-size": 0,
+                     "date-sec": 10000200,
+                     "date-nsec": 12,
+                     "vm-clock-sec": 206,
+                     "vm-clock-nsec": 30
+                  }
+               ]
+            }
+         }
+      ]
+   }
+
+EQMP
+
+    {
+        .name       = "query-images",
+        .args_type  = "",
+        .mhandler.cmd_new = qmp_marshal_input_query_images,
+    },
+
+SQMP
 query-blockstats
 ----------------
 
-- 
1.7.1