[Qemu-devel] [PATCH V4 2/3] block: Use bdrv_get_backing_file_depth()

[benoit.canet@gmail.com]

From: Benoît Canet <benoit@irqsave.net>

Use the dedicated counting function in qmp_query_block in order to
propagate the backing file depth to HMP.

Signed-off-by: Benoit Canet <benoit@irqsave.net>
---
 block.c          |    3 +++
 qapi-schema.json |    9 ++++++---
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/block.c b/block.c
index 22ebe49..a6fba1d 100644
--- a/block.c
+++ b/block.c
@@ -2450,6 +2450,9 @@ BlockInfoList *qmp_query_block(Error **errp)
                 info->value->inserted->backing_file = g_strdup(bs->backing_file);
             }
 
+            info->value->inserted->backing_file_depth =
+                bdrv_get_backing_file_depth(bs);
+
             if (bs->io_limits_enabled) {
                 info->value->inserted->bps =
                                bs->io_limits.bps[BLOCK_IO_LIMIT_TOTAL];
diff --git a/qapi-schema.json b/qapi-schema.json
index a92adb1..70a17fb 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -398,6 +398,8 @@
 #
 # @backing_file: #optional the name of the backing file (for copy-on-write)
 #
+# @backing-file-depth: the count of ancestor's backing files (since: 1.2)
+#
 # @encrypted: true if the backing device is encrypted
 #
 # @bps: total throughput limit in bytes per second is specified
@@ -418,9 +420,10 @@
 ##
 { 'type': 'BlockDeviceInfo',
   'data': { 'file': 'str', 'ro': 'bool', 'drv': 'str',
-            '*backing_file': 'str', 'encrypted': 'bool',
-            'bps': 'int', 'bps_rd': 'int', 'bps_wr': 'int',
-            'iops': 'int', 'iops_rd': 'int', 'iops_wr': 'int'} }
+            '*backing_file': 'str', 'backing-file-depth': 'int',
+            'encrypted': 'bool', 'bps': 'int', 'bps_rd': 'int',
+            'bps_wr': 'int', 'iops': 'int', 'iops_rd': 'int',
+            'iops_wr': 'int'} }
 
 ##
 # @BlockDeviceIoStatus:
-- 
1.7.9.5