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block: Mark bdrv_(un)register_buf() GRAPH_RDLOCK 

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

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20230203152202.49054-21-kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
master
Kevin Wolf 2023-02-03 16:21:59 +01:00
parent 79a292e5ec
commit d9249c253c
2 changed files with 14 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
block/io.c
View File

@ -3187,13 +3187,15 @@ void coroutine_fn bdrv_co_io_unplug(BlockDriverState *bs)
}
/* Helper that undoes bdrv_register_buf() when it fails partway through */
static void bdrv_register_buf_rollback(BlockDriverState *bs,
void *host,
size_t size,
BdrvChild *final_child)
static void GRAPH_RDLOCK
bdrv_register_buf_rollback(BlockDriverState *bs, void *host, size_t size,
BdrvChild *final_child)
{
BdrvChild *child;
GLOBAL_STATE_CODE();
assert_bdrv_graph_readable();
QLIST_FOREACH(child, &bs->children, next) {
if (child == final_child) {
break;
@ -3213,6 +3215,8 @@ bool bdrv_register_buf(BlockDriverState *bs, void *host, size_t size,
BdrvChild *child;
GLOBAL_STATE_CODE();
GRAPH_RDLOCK_GUARD_MAINLOOP();
if (bs->drv && bs->drv->bdrv_register_buf) {
if (!bs->drv->bdrv_register_buf(bs, host, size, errp)) {
return false;
@ -3232,6 +3236,8 @@ void bdrv_unregister_buf(BlockDriverState *bs, void *host, size_t size)
BdrvChild *child;
GLOBAL_STATE_CODE();
GRAPH_RDLOCK_GUARD_MAINLOOP();
if (bs->drv && bs->drv->bdrv_unregister_buf) {
bs->drv->bdrv_unregister_buf(bs, host, size);
}

7
include/block/block_int-common.h
View File

@ -445,9 +445,10 @@ struct BlockDriver {
*
* Returns: true on success, false on failure
*/
bool (*bdrv_register_buf)(BlockDriverState *bs, void *host, size_t size,
Error **errp);
void (*bdrv_unregister_buf)(BlockDriverState *bs, void *host, size_t size);
bool GRAPH_RDLOCK_PTR (*bdrv_register_buf)(
BlockDriverState *bs, void *host, size_t size, Error **errp);
void GRAPH_RDLOCK_PTR (*bdrv_unregister_buf)(
BlockDriverState *bs, void *host, size_t size);
/*
* This field is modified only under the BQL, and is part of