[Qemu-devel] [PATCH v4 08/11] qmp: Add an implementation wrapper for qmp_drive_backup

[John Snow <jsnow@redhat.com>]

We'd like to be able to specify the callback given to backup_start
manually in the case of transactions, so split apart qmp_drive_backup
into an implementation and a wrapper.

Switch drive_backup_prepare to use the new wrapper, but don't overload
the callback and closure yet.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
 blockdev.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 59 insertions(+), 19 deletions(-)

diff --git a/blockdev.c b/blockdev.c
index 27db1b4..f391e18 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1794,6 +1794,19 @@ typedef struct DriveBackupState {
     BlockJob *job;
 } DriveBackupState;
 
+static void do_drive_backup(const char *device, const char *target,
+                            bool has_format, const char *format,
+                            enum MirrorSyncMode sync,
+                            bool has_mode, enum NewImageMode mode,
+                            bool has_speed, int64_t speed,
+                            bool has_bitmap, const char *bitmap,
+                            bool has_on_source_error,
+                            BlockdevOnError on_source_error,
+                            bool has_on_target_error,
+                            BlockdevOnError on_target_error,
+                            BlockCompletionFunc *cb, void *opaque,
+                            Error **errp);
+
 static void drive_backup_prepare(BlkActionState *common, Error **errp)
 {
     DriveBackupState *state = DO_UPCAST(DriveBackupState, common, common);
@@ -1816,15 +1829,16 @@ static void drive_backup_prepare(BlkActionState *common, Error **errp)
     state->aio_context = bdrv_get_aio_context(bs);
     aio_context_acquire(state->aio_context);
 
-    qmp_drive_backup(backup->device, backup->target,
-                     backup->has_format, backup->format,
-                     backup->sync,
-                     backup->has_mode, backup->mode,
-                     backup->has_speed, backup->speed,
-                     backup->has_bitmap, backup->bitmap,
-                     backup->has_on_source_error, backup->on_source_error,
-                     backup->has_on_target_error, backup->on_target_error,
-                     &local_err);
+    do_drive_backup(backup->device, backup->target,
+                    backup->has_format, backup->format,
+                    backup->sync,
+                    backup->has_mode, backup->mode,
+                    backup->has_speed, backup->speed,
+                    backup->has_bitmap, backup->bitmap,
+                    backup->has_on_source_error, backup->on_source_error,
+                    backup->has_on_target_error, backup->on_target_error,
+                    NULL, NULL,
+                    &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
@@ -2778,15 +2792,18 @@ out:
     aio_context_release(aio_context);
 }
 
-void qmp_drive_backup(const char *device, const char *target,
-                      bool has_format, const char *format,
-                      enum MirrorSyncMode sync,
-                      bool has_mode, enum NewImageMode mode,
-                      bool has_speed, int64_t speed,
-                      bool has_bitmap, const char *bitmap,
-                      bool has_on_source_error, BlockdevOnError on_source_error,
-                      bool has_on_target_error, BlockdevOnError on_target_error,
-                      Error **errp)
+static void do_drive_backup(const char *device, const char *target,
+                            bool has_format, const char *format,
+                            enum MirrorSyncMode sync,
+                            bool has_mode, enum NewImageMode mode,
+                            bool has_speed, int64_t speed,
+                            bool has_bitmap, const char *bitmap,
+                            bool has_on_source_error,
+                            BlockdevOnError on_source_error,
+                            bool has_on_target_error,
+                            BlockdevOnError on_target_error,
+                            BlockCompletionFunc *cb, void *opaque,
+                            Error **errp)
 {
     BlockBackend *blk;
     BlockDriverState *bs;
@@ -2900,9 +2917,16 @@ void qmp_drive_backup(const char *device, const char *target,
         }
     }
 
+    /* If we are not supplied with callback override info, use our defaults */
+    if (cb == NULL) {
+        cb = block_job_cb;
+    }
+    if (opaque == NULL) {
+        opaque = bs;
+    }
     backup_start(bs, target_bs, speed, sync, bmap,
                  on_source_error, on_target_error,
-                 block_job_cb, bs, &local_err);
+                 cb, opaque, &local_err);
     if (local_err != NULL) {
         bdrv_unref(target_bs);
         error_propagate(errp, local_err);
@@ -2913,6 +2937,22 @@ out:
     aio_context_release(aio_context);
 }
 
+void qmp_drive_backup(const char *device, const char *target,
+                      bool has_format, const char *format,
+                      enum MirrorSyncMode sync,
+                      bool has_mode, enum NewImageMode mode,
+                      bool has_speed, int64_t speed,
+                      bool has_bitmap, const char *bitmap,
+                      bool has_on_source_error, BlockdevOnError on_source_error,
+                      bool has_on_target_error, BlockdevOnError on_target_error,
+                      Error **errp)
+{
+    do_drive_backup(device, target, has_format, format, sync, has_mode, mode,
+                    has_speed, speed, has_bitmap, bitmap, has_on_source_error,
+                    on_source_error, has_on_target_error, on_target_error,
+                    NULL, NULL, errp);
+}
+
 BlockDeviceInfoList *qmp_query_named_block_nodes(Error **errp)
 {
     return bdrv_named_nodes_list(errp);
-- 
2.1.0