[PATCH v3 5/8] blockdev: merge blockdev_backup_prepare with do_blockdev_backup

[Sergio Lopez <slp@redhat.com>]

Consolidate blockdev_backup_prepare() with do_blockdev_backup() as a
first step towards streamlining all functionality through
transactions.

Signed-off-by: Sergio Lopez <slp@redhat.com>
---
 blockdev.c | 64 +++++++++++++-----------------------------------------
 1 file changed, 15 insertions(+), 49 deletions(-)

diff --git a/blockdev.c b/blockdev.c
index 5e85fc042e..128707cdc6 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1940,47 +1940,6 @@ typedef struct BlockdevBackupState {
     BlockJob *job;
 } BlockdevBackupState;
 
-static BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
-                                    Error **errp);
-
-static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
-{
-    BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
-    BlockdevBackup *backup;
-    BlockDriverState *bs, *target;
-    AioContext *aio_context;
-    Error *local_err = NULL;
-
-    assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
-    backup = common->action->u.blockdev_backup.data;
-
-    bs = bdrv_lookup_bs(backup->device, backup->device, errp);
-    if (!bs) {
-        return;
-    }
-
-    target = bdrv_lookup_bs(backup->target, backup->target, errp);
-    if (!target) {
-        return;
-    }
-
-    aio_context = bdrv_get_aio_context(bs);
-    aio_context_acquire(aio_context);
-    state->bs = bs;
-
-    /* Paired with .clean() */
-    bdrv_drained_begin(state->bs);
-
-    state->job = do_blockdev_backup(backup, common->block_job_txn, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-        goto out;
-    }
-
-out:
-    aio_context_release(aio_context);
-}
-
 static void blockdev_backup_commit(BlkActionState *common)
 {
     BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
@@ -3695,32 +3654,39 @@ XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp)
     return bdrv_get_xdbg_block_graph(errp);
 }
 
-BlockJob *do_blockdev_backup(BlockdevBackup *backup, JobTxn *txn,
-                             Error **errp)
+static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
 {
+    BlockdevBackupState *state = DO_UPCAST(BlockdevBackupState, common, common);
+    BlockdevBackup *backup;
     BlockDriverState *bs;
     BlockDriverState *target_bs;
     AioContext *aio_context;
-    BlockJob *job;
+
+    assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
+    backup = common->action->u.blockdev_backup.data;
 
     bs = bdrv_lookup_bs(backup->device, backup->device, errp);
     if (!bs) {
-        return NULL;
+        return;
     }
 
     target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
     if (!target_bs) {
-        return NULL;
+        return;
     }
 
     aio_context = bdrv_get_aio_context(bs);
     aio_context_acquire(aio_context);
+    state->bs = bs;
 
-    job = do_backup_common(qapi_BlockdevBackup_base(backup),
-                           bs, target_bs, aio_context, txn, errp);
+    /* Paired with .clean() */
+    bdrv_drained_begin(state->bs);
+
+    state->job = do_backup_common(qapi_BlockdevBackup_base(backup),
+                                  bs, target_bs, aio_context,
+                                  common->block_job_txn, errp);
 
     aio_context_release(aio_context);
-    return job;
 }
 
 void qmp_blockdev_backup(BlockdevBackup *arg, Error **errp)
-- 
2.23.0