[PATCH 06/11] blockdev: drain while unlocked in internal_snapshot_action()

[Fiona Ebner]

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
---

Could the bs associated to the device change because of polling
when draining? If yes, does that mean we need to drain all in the
beginning and not temporarily unlock?

 blockdev.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/blockdev.c b/blockdev.c
index 1272b9a745..f2b4fdf1b3 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1216,7 +1216,7 @@ static void 
internal_snapshot_action(BlockdevSnapshotInternal *internal,
     int ret1;
 
     GLOBAL_STATE_CODE();
-    GRAPH_RDLOCK_GUARD_MAINLOOP();
+    bdrv_graph_rdlock_main_loop();
 
     tran_add(tran, &internal_snapshot_drv, state);
 
@@ -1225,14 +1225,18 @@ static void 
internal_snapshot_action(BlockdevSnapshotInternal *internal,
 
     bs = qmp_get_root_bs(device, errp);
     if (!bs) {
+        bdrv_graph_rdunlock_main_loop();
         return;
     }
 
     state->bs = bs;
 
+    bdrv_graph_rdunlock_main_loop();
     /* Paired with .clean() */
     bdrv_drained_begin(bs);
 
+    GRAPH_RDLOCK_GUARD_MAINLOOP();
+
     if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
         return;
     }
-- 
2.39.5