[Qemu-devel] [PATCH V10 11/17] qmp: add ImageInfo in BlockDeviceInfo used by query-block

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

  Now image info will be retrieved as an embbed json object inside
BlockDeviceInfo, backing chain info and all related internal snapshot
info can be got in the enhanced recursive structure of ImageInfo.

Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
---
 block/qapi.c         |   39 ++++++++++++++++++++++++++--
 include/block/qapi.h |    4 ++-
 qapi-schema.json     |    5 +++-
 qmp-commands.hx      |   67 +++++++++++++++++++++++++++++++++++++++++++++++++-
 4 files changed, 109 insertions(+), 6 deletions(-)

diff --git a/block/qapi.c b/block/qapi.c
index df73f5b..9051947 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -200,9 +200,15 @@ int bdrv_query_image_info(BlockDriverState *bs,
     return 0;
 }
 
-BlockInfo *bdrv_query_info(BlockDriverState *bs)
+/* return 0 on success, and @p_info will be set only on success. */
+int bdrv_query_info(BlockDriverState *bs,
+                    BlockInfo **p_info,
+                    Error **errp)
 {
     BlockInfo *info = g_malloc0(sizeof(*info));
+    BlockDriverState *bs0;
+    ImageInfo **p_image_info;
+    int ret = 0;
     info->device = g_strdup(bs->device_name);
     info->type = g_strdup("unknown");
     info->locked = bdrv_dev_is_medium_locked(bs);
@@ -256,8 +262,29 @@ BlockInfo *bdrv_query_info(BlockDriverState *bs)
             info->inserted->iops_wr =
                            bs->io_limits.iops[BLOCK_IO_LIMIT_WRITE];
         }
+
+        bs0 = bs;
+        p_image_info = &info->inserted->image;
+        while (1) {
+            if (bdrv_query_image_info(bs0, p_image_info, errp)) {
+                goto err;
+            }
+            if (bs0->drv && bs0->backing_hd) {
+                bs0 = bs0->backing_hd;
+                (*p_image_info)->has_backing_image = true;
+                p_image_info = &((*p_image_info)->backing_image);
+            } else {
+                break;
+            }
+        }
     }
-    return info;
+
+    *p_info = info;
+    return 0;
+
+ err:
+    qapi_free_BlockInfo(info);
+    return ret;
 }
 
 SnapshotInfoList *qmp_query_snapshots(Error **errp)
@@ -284,11 +311,17 @@ BlockInfoList *qmp_query_block(Error **errp)
 
     while ((bs = bdrv_next(bs))) {
         BlockInfoList *info = g_malloc0(sizeof(*info));
-        info->value = bdrv_query_info(bs);
+        if (bdrv_query_info(bs, &info->value, errp)) {
+            goto err;
+        }
 
         *p_next = info;
         p_next = &info->next;
     }
 
     return head;
+
+ err:
+    qapi_free_BlockInfoList(head);
+    return NULL;
 }
diff --git a/include/block/qapi.h b/include/block/qapi.h
index 0039a70..49f9a17 100644
--- a/include/block/qapi.h
+++ b/include/block/qapi.h
@@ -35,5 +35,7 @@ int bdrv_query_snapshot_info_list(BlockDriverState *bs,
 int bdrv_query_image_info(BlockDriverState *bs,
                           ImageInfo **p_info,
                           Error **errp);
-BlockInfo *bdrv_query_info(BlockDriverState *bs);
+int bdrv_query_info(BlockDriverState *bs,
+                    BlockInfo **p_info,
+                    Error **errp);
 #endif
diff --git a/qapi-schema.json b/qapi-schema.json
index b927c97..9a9e673 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -754,6 +754,8 @@
 #
 # @iops_wr: write I/O operations per second is specified
 #
+# @image: the info of image used (since: 1.5)
+#
 # Since: 0.14.0
 #
 # Notes: This interface is only found in @BlockInfo.
@@ -763,7 +765,8 @@
             '*backing_file': 'str', 'backing_file_depth': 'int',
             'encrypted': 'bool', 'encryption_key_missing': 'bool',
             'bps': 'int', 'bps_rd': 'int', 'bps_wr': 'int',
-            'iops': 'int', 'iops_rd': 'int', 'iops_wr': 'int'} }
+            'iops': 'int', 'iops_rd': 'int', 'iops_wr': 'int',
+            'image': 'ImageInfo' } }
 
 ##
 # @BlockDeviceIoStatus:
diff --git a/qmp-commands.hx b/qmp-commands.hx
index a4cd229..f977c6f 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -1681,6 +1681,47 @@ Each json-object contain the following:
          - "iops": limit total I/O operations per second (json-int)
          - "iops_rd": limit read operations per second (json-int)
          - "iops_wr": limit write operations per second (json-int)
+         - "image": the detail of the image, it is a json-object containing
+            the following:
+             - "filename": image file name (json-string)
+             - "format": image format (json-string)
+             - "virtual-size": image capacity in bytes (json-int)
+             - "dirty-flag": true if image is not cleanly closed, not present
+                             means clean (json-bool, optional)
+             - "actual-size": actual size on disk in bytes of the image, not
+                              present when image does not support thin
+                              provision (json-int, optional)
+             - "cluster-size": size of a cluster in bytes, not present if image
+                               format does not support it (json-int, optional)
+             - "encrypted": true if the image is encrypted, not present means
+                            false or the image format does not support
+                            encryption (json-bool, optional)
+             - "backing_file": backing file name, not present means no backing
+                               file is used or the image format does not
+                               support backing file chain
+                               (json-string, optional)
+             - "full-backing-filename": full path of the backing file, not
+                                        present if it equals backing_file or no
+                                        backing file is used
+                                        (json-string, optional)
+             - "backing-filename-format": the format of the backing file, not
+                                          present means unknown or no 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": 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 nanoseconds 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 nanoseconds to be used
+                                    with vm-clock-sec (json-int)
+             - "backing-image": the detail of the backing image, it is an
+                                optional json-object only present when a
+                                backing image present for this image
 
 - "io-status": I/O operation status, only present if the device supports it
                and the VM is configured to stop on errors. It's always reset
@@ -1702,13 +1743,37 @@ Example:
                "drv":"qcow2",
                "encrypted":false,
                "file":"disks/test.img",
-               "backing_file_depth":0,
+               "backing_file_depth":1,
                "bps":1000000,
                "bps_rd":0,
                "bps_wr":0,
                "iops":1000000,
                "iops_rd":0,
                "iops_wr":0,
+               "image":{
+                  "filename":"disks/test.img",
+                  "format":"qcow2",
+                  "virtual-size":2048000,
+                  "backing_file":"base.img",
+                  "full-backing-filename":"disks/base.img",
+                  "backing-filename-format:"qcow2",
+                  "snapshots":[
+                     {
+                        "id": "1",
+                        "name": "snapshot1",
+                        "vm-state-size": 0,
+                        "date-sec": 10000200,
+                        "date-nsec": 12,
+                        "vm-clock-sec": 206,
+                        "vm-clock-nsec": 30
+                     }
+                  ],
+                  "backing-image":{
+                      "filename":"disks/base.img",
+                      "format":"qcow2",
+                      "virtual-size":2048000
+                  }
+               }
             },
             "type":"unknown"
          },
-- 
1.7.1