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block: Mark bdrv_co_debug_event() GRAPH_RDLOCK 

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

Unfortunately we cannot use a co_wrapper_bdrv_rdlock (i.e. make the
coroutine wrapper a no_coroutine_fn), because the function is called
(using the BLKDBG_EVENT macro) by mixed functions that run both in
coroutine and non-coroutine context (for example many of the functions
in qcow2-cluster.c and qcow2-refcount.c).

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20230504115750.54437-16-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
master
Emanuele Giuseppe Esposito 2023-05-04 13:57:45 +02:00 committed by Kevin Wolf
parent a00e70c012
commit cb2bfaa450
3 changed files with 9 additions and 6 deletions
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2
block.c
View File

@ -6399,6 +6399,8 @@ BlockStatsSpecific *bdrv_get_specific_stats(BlockDriverState *bs)
void coroutine_fn bdrv_co_debug_event(BlockDriverState *bs, BlkdebugEvent event)
{
IO_CODE();
assert_bdrv_graph_readable();
if (!bs || !bs->drv || !bs->drv->bdrv_co_debug_event) {
return;
}

9
include/block/block-io.h
View File

@ -205,10 +205,11 @@ void *qemu_try_blockalign0(BlockDriverState *bs, size_t size);
void bdrv_enable_copy_on_read(BlockDriverState *bs);
void bdrv_disable_copy_on_read(BlockDriverState *bs);
void coroutine_fn bdrv_co_debug_event(BlockDriverState *bs,
BlkdebugEvent event);
void co_wrapper_mixed bdrv_debug_event(BlockDriverState *bs,
BlkdebugEvent event);
void coroutine_fn GRAPH_RDLOCK
bdrv_co_debug_event(BlockDriverState *bs, BlkdebugEvent event);
void co_wrapper_mixed_bdrv_rdlock
bdrv_debug_event(BlockDriverState *bs, BlkdebugEvent event);
#define BLKDBG_EVENT(child, evt) \
do { \

4
include/block/block_int-common.h
View File

@ -735,8 +735,8 @@ struct BlockDriver {
int coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_check)(
BlockDriverState *bs, BdrvCheckResult *result, BdrvCheckMode fix);
void coroutine_fn (*bdrv_co_debug_event)(BlockDriverState *bs,
BlkdebugEvent event);
void coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_debug_event)(
BlockDriverState *bs, BlkdebugEvent event);
/* io queue for linux-aio */
void coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_io_plug)(BlockDriverState *bs);