[PULL 10/26] block: Mark bdrv_parent_cb_resize() and callers GRAPH_RDLOCK

[Kevin Wolf]

This adds GRAPH_RDLOCK annotations to declare that callers of
bdrv_parent_cb_resize() need to hold a reader lock for the graph.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20230929145157.45443-7-kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/io.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/block/io.c b/block/io.c
index e2e846d37d..527a1de04e 100644
--- a/block/io.c
+++ b/block/io.c
@@ -42,7 +42,9 @@
 /* Maximum bounce buffer for copy-on-read and write zeroes, in bytes */
 #define MAX_BOUNCE_BUFFER (32768 << BDRV_SECTOR_BITS)
 
-static void bdrv_parent_cb_resize(BlockDriverState *bs);
+static void coroutine_fn GRAPH_RDLOCK
+bdrv_parent_cb_resize(BlockDriverState *bs);
+
 static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs,
     int64_t offset, int64_t bytes, BdrvRequestFlags flags);
 
@@ -2027,7 +2029,7 @@ bdrv_co_write_req_prepare(BdrvChild *child, int64_t 
offset, int64_t bytes,
     }
 }
 
-static inline void coroutine_fn
+static inline void coroutine_fn GRAPH_RDLOCK
 bdrv_co_write_req_finish(BdrvChild *child, int64_t offset, int64_t bytes,
                          BdrvTrackedRequest *req, int ret)
 {
@@ -3530,9 +3532,13 @@ int coroutine_fn bdrv_co_copy_range(BdrvChild *src, 
int64_t src_offset,
                                    bytes, read_flags, write_flags);
 }
 
-static void bdrv_parent_cb_resize(BlockDriverState *bs)
+static void coroutine_fn GRAPH_RDLOCK
+bdrv_parent_cb_resize(BlockDriverState *bs)
 {
     BdrvChild *c;
+
+    assert_bdrv_graph_readable();
+
     QLIST_FOREACH(c, &bs->parents, next_parent) {
         if (c->klass->resize) {
             c->klass->resize(c);
-- 
2.41.0