This adds GRAPH_RDLOCK annotations to declare that callers of
bdrv_recurse_can_replace() need to hold a reader lock for the graph
because it accesses the children list of a node.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <
20230504115750.54437-20-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
return bdrv_co_flush(s->test_file->bs);
}
-static bool blkverify_recurse_can_replace(BlockDriverState *bs,
- BlockDriverState *to_replace)
+static bool GRAPH_RDLOCK
+blkverify_recurse_can_replace(BlockDriverState *bs,
+ BlockDriverState *to_replace)
{
BDRVBlkverifyState *s = bs->opaque;
* Cannot use check_to_replace_node() here, because that would
* check for an op blocker on @to_replace, and we have our own
* there.
+ *
+ * TODO Pull out the writer lock from bdrv_replace_node() to here
*/
+ bdrv_graph_rdlock_main_loop();
if (bdrv_recurse_can_replace(src, to_replace)) {
bdrv_replace_node(to_replace, target_bs, &local_err);
} else {
"would not lead to an abrupt change of visible data",
to_replace->node_name, target_bs->node_name);
}
+ bdrv_graph_rdunlock_main_loop();
bdrv_drained_end(target_bs);
if (local_err) {
error_report_err(local_err);
return result;
}
-static bool quorum_recurse_can_replace(BlockDriverState *bs,
- BlockDriverState *to_replace)
+static bool GRAPH_RDLOCK
+quorum_recurse_can_replace(BlockDriverState *bs, BlockDriverState *to_replace)
{
BDRVQuorumState *s = bs->opaque;
int i;
BlockDriverState *unfiltered_bs;
int job_flags = JOB_DEFAULT;
+ GLOBAL_STATE_CODE();
+ GRAPH_RDLOCK_GUARD_MAINLOOP();
+
if (!has_speed) {
speed = 0;
}
Error **errp);
/* check if a named node can be replaced when doing drive-mirror */
-BlockDriverState *check_to_replace_node(BlockDriverState *parent_bs,
- const char *node_name, Error **errp);
+BlockDriverState * GRAPH_RDLOCK
+check_to_replace_node(BlockDriverState *parent_bs, const char *node_name,
+ Error **errp);
int no_coroutine_fn bdrv_activate(BlockDriverState *bs, Error **errp);
* same data as @bs without it affecting @bs's behavior (that is,
* without it being visible to @bs's parents).
*/
- bool (*bdrv_recurse_can_replace)(BlockDriverState *bs,
- BlockDriverState *to_replace);
+ bool GRAPH_RDLOCK_PTR (*bdrv_recurse_can_replace)(
+ BlockDriverState *bs, BlockDriverState *to_replace);
int (*bdrv_probe_device)(const char *filename);
*/
int bdrv_child_refresh_perms(BlockDriverState *bs, BdrvChild *c, Error **errp);
-bool bdrv_recurse_can_replace(BlockDriverState *bs,
- BlockDriverState *to_replace);
+bool GRAPH_RDLOCK bdrv_recurse_can_replace(BlockDriverState *bs,
+ BlockDriverState *to_replace);
/*
* Default implementation for BlockDriver.bdrv_child_perm() that can