[PATCH 5/7] qapi: add filter-node-name to block-stream

[Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>]

Provide the possibility to pass the 'filter-node-name' parameter to the
block-stream job as it is done for the commit block job.

Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
---
 block/stream.c            | 5 +++--
 blockdev.c                | 8 +++++++-
 include/block/block_int.h | 7 ++++++-
 monitor/hmp-cmds.c        | 4 ++--
 qapi/block-core.json      | 6 ++++++
 5 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/block/stream.c b/block/stream.c
index d8b4bbe..fab7923 100644
--- a/block/stream.c
+++ b/block/stream.c
@@ -229,7 +229,9 @@ static const BlockJobDriver stream_job_driver = {
 void stream_start(const char *job_id, BlockDriverState *bs,
                   BlockDriverState *base, const char *backing_file_str,
                   int creation_flags, int64_t speed,
-                  BlockdevOnError on_error, Error **errp)
+                  BlockdevOnError on_error,
+                  const char *filter_node_name,
+                  Error **errp)
 {
     StreamBlockJob *s;
     BlockDriverState *iter;
@@ -265,7 +267,6 @@ void stream_start(const char *job_id, BlockDriverState *bs,
     } else {
         bdrv_unfreeze_chain(bottom_cow_node, above_base);
     }
-
     /* Prevent concurrent jobs trying to modify the graph structure here, we
      * already have our own plans. Also don't allow resize as the image size is
      * queried only at the job start and then cached. */
diff --git a/blockdev.c b/blockdev.c
index 72d28ce..f275a64 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -3242,6 +3242,7 @@ void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
                       bool has_backing_file, const char *backing_file,
                       bool has_speed, int64_t speed,
                       bool has_on_error, BlockdevOnError on_error,
+                      bool has_filter_node_name, const char *filter_node_name,
                       bool has_auto_finalize, bool auto_finalize,
                       bool has_auto_dismiss, bool auto_dismiss,
                       Error **errp)
@@ -3257,6 +3258,10 @@ void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
         on_error = BLOCKDEV_ON_ERROR_REPORT;
     }
 
+    if (!has_filter_node_name) {
+        filter_node_name = NULL;
+    }
+
     bs = bdrv_lookup_bs(device, device, errp);
     if (!bs) {
         return;
@@ -3324,7 +3329,8 @@ void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
     }
 
     stream_start(has_job_id ? job_id : NULL, bs, base_bs, base_name,
-                 job_flags, has_speed ? speed : 0, on_error, &local_err);
+                 job_flags, has_speed ? speed : 0, on_error,
+                 filter_node_name, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         goto out;
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 993bafc..5ac4891 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -1052,6 +1052,9 @@ int is_windows_drive(const char *filename);
  *                  See @BlockJobCreateFlags
  * @speed: The maximum speed, in bytes per second, or 0 for unlimited.
  * @on_error: The action to take upon error.
+ * @filter_node_name: The node name that should be assigned to the filter
+ * driver that the commit job inserts into the graph above @bs. NULL means
+ * that a node name should be autogenerated.
  * @errp: Error object.
  *
  * Start a streaming operation on @bs.  Clusters that are unallocated
@@ -1064,7 +1067,9 @@ int is_windows_drive(const char *filename);
 void stream_start(const char *job_id, BlockDriverState *bs,
                   BlockDriverState *base, const char *backing_file_str,
                   int creation_flags, int64_t speed,
-                  BlockdevOnError on_error, Error **errp);
+                  BlockdevOnError on_error,
+                  const char *filter_node_name,
+                  Error **errp);
 
 /**
  * commit_start:
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index 5ca3ebe..0432ac9 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -2044,8 +2044,8 @@ void hmp_block_stream(Monitor *mon, const QDict *qdict)
 
     qmp_block_stream(true, device, device, base != NULL, base, false, NULL,
                      false, NULL, qdict_haskey(qdict, "speed"), speed, true,
-                     BLOCKDEV_ON_ERROR_REPORT, false, false, false, false,
-                     &error);
+                     BLOCKDEV_ON_ERROR_REPORT, false, NULL, false, false,
+                     false, false, &error);
 
     hmp_handle_error(mon, &error);
 }
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 3c54717..169f8ea 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -2552,6 +2552,11 @@
 #            'stop' and 'enospc' can only be used if the block device
 #            supports io-status (see BlockInfo).  Since 1.3.
 #
+# @filter-node-name: the node name that should be assigned to the
+#                    filter driver that the stream job inserts into the graph
+#                    above @device. If this option is not given, a node name is
+#                    autogenerated. (Since: 5.0)
+#
 # @auto-finalize: When false, this job will wait in a PENDING state after it has
 #                 finished its work, waiting for @block-job-finalize before
 #                 making any block graph changes.
@@ -2581,6 +2586,7 @@
   'data': { '*job-id': 'str', 'device': 'str', '*base': 'str',
             '*base-node': 'str', '*backing-file': 'str', '*speed': 'int',
             '*on-error': 'BlockdevOnError',
+            '*filter-node-name': 'str',
             '*auto-finalize': 'bool', '*auto-dismiss': 'bool' } }
 
 ##
-- 
1.8.3.1