[Qemu-devel] [RFC PATCH 4/7] block-backend: Add blk_op_blocker_add_notifier

[Fam Zheng <famz@redhat.com>]

Forward the call to bdrv_op_blocker_add_notifier.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block.c                        | 4 ++--
 block/block-backend.c          | 6 ++++++
 include/sysemu/block-backend.h | 2 ++
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/block.c b/block.c
index 054ddb4..d98a304 100644
--- a/block.c
+++ b/block.c
@@ -3414,23 +3414,23 @@ void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason)
     BdrvOpBlocker *blocker;
     assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX);
 
-    bdrv_op_blocker_notify(bs, op, reason, true);
     blocker = g_new0(BdrvOpBlocker, 1);
     blocker->reason = reason;
     QLIST_INSERT_HEAD(&bs->op_blockers[op], blocker, list);
+    bdrv_op_blocker_notify(bs, op, reason, true);
 }
 
 void bdrv_op_unblock(BlockDriverState *bs, BlockOpType op, Error *reason)
 {
     BdrvOpBlocker *blocker, *next;
     assert((int) op >= 0 && op < BLOCK_OP_TYPE_MAX);
-    bdrv_op_blocker_notify(bs, op, reason, false);
     QLIST_FOREACH_SAFE(blocker, &bs->op_blockers[op], list, next) {
         if (blocker->reason == reason) {
             QLIST_REMOVE(blocker, list);
             g_free(blocker);
         }
     }
+    bdrv_op_blocker_notify(bs, op, reason, false);
 }
 
 void bdrv_op_block_all(BlockDriverState *bs, Error *reason)
diff --git a/block/block-backend.c b/block/block-backend.c
index 71fc695..90d7476 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -806,6 +806,12 @@ void blk_op_unblock_all(BlockBackend *blk, Error *reason)
     bdrv_op_unblock_all(blk->bs, reason);
 }
 
+void blk_op_blocker_add_notifier(BlockBackend *blk,
+                                 Notifier *notifier)
+{
+    bdrv_op_blocker_add_notifier(blk->bs, notifier);
+}
+
 AioContext *blk_get_aio_context(BlockBackend *blk)
 {
     return bdrv_get_aio_context(blk->bs);
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index b4a4d5e..cde9651 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -136,6 +136,8 @@ int blk_get_flags(BlockBackend *blk);
 int blk_get_max_transfer_length(BlockBackend *blk);
 void blk_set_guest_block_size(BlockBackend *blk, int align);
 void *blk_blockalign(BlockBackend *blk, size_t size);
+void blk_op_blocker_add_notifier(BlockBackend *blk,
+                                 Notifier *notifier);
 bool blk_op_is_blocked(BlockBackend *blk, BlockOpType op, Error **errp);
 void blk_op_unblock(BlockBackend *blk, BlockOpType op, Error *reason);
 void blk_op_block_all(BlockBackend *blk, Error *reason);
-- 
1.9.3