block: Mark bdrv_child_perm() GRAPH_RDLOCK

This adds GRAPH_RDLOCK annotations to declare that callers of
bdrv_child_perm() need to hold a reader lock for the graph because
some implementations access the children list of a node.

The callers of bdrv_child_perm() conveniently already hold the lock.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230911094620.45040-16-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 6 insertions, 5 deletions

diff --git a/block.c b/block.c
index 186efda70f..0f7f78f8de 100644
--- a/block.c
+++ b/block.c
@@ -2228,11 +2228,12 @@ bdrv_parent_perms_conflict(BlockDriverState *bs, Error **errp)
     return false;
 }
 
-static void bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs,
-                            BdrvChild *c, BdrvChildRole role,
-                            BlockReopenQueue *reopen_queue,
-                            uint64_t parent_perm, uint64_t parent_shared,
-                            uint64_t *nperm, uint64_t *nshared)
+static void GRAPH_RDLOCK
+bdrv_child_perm(BlockDriverState *bs, BlockDriverState *child_bs,
+                BdrvChild *c, BdrvChildRole role,
+                BlockReopenQueue *reopen_queue,
+                uint64_t parent_perm, uint64_t parent_shared,
+                uint64_t *nperm, uint64_t *nshared)
 {
     assert(bs->drv && bs->drv->bdrv_child_perm);
     GLOBAL_STATE_CODE();