[Qemu-devel] [RFC 1/8] block: add virtual_size to query-block QMP output

[Stefan Hajnoczi <stefanha@redhat.com>]

There is currently no way to query the size of a drive.  Add a
'virtual_size' field to the 'query-block' QMP output.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 block.c          | 1 +
 qapi-schema.json | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/block.c b/block.c
index 124a9eb..0128e27 100644
--- a/block.c
+++ b/block.c
@@ -2908,6 +2908,7 @@ BlockInfo *bdrv_query_info(BlockDriverState *bs)
         info->has_inserted = true;
         info->inserted = g_malloc0(sizeof(*info->inserted));
         info->inserted->file = g_strdup(bs->filename);
+        info->inserted->virtual_size = bdrv_getlength(bs);
         info->inserted->ro = bs->read_only;
         info->inserted->drv = g_strdup(bs->drv->format_name);
         info->inserted->encrypted = bs->encrypted;
diff --git a/qapi-schema.json b/qapi-schema.json
index 28b070f..6b64aec 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -751,6 +751,8 @@
 #
 # @iops_wr: write I/O operations per second is specified
 #
+# @virtual_size: size of block device, in bytes
+#
 # Since: 0.14.0
 #
 # Notes: This interface is only found in @BlockInfo.
@@ -760,7 +762,8 @@
             '*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',
+            'virtual_size': 'int' } }
 
 ##
 # @BlockDeviceIoStatus:
-- 
1.8.1.4