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block: Mark bdrv_get_specific_info() and callers GRAPH_RDLOCK 

This adds GRAPH_RDLOCK annotations to declare that callers of
bdrv_get_specific_info() need to hold a reader lock for the graph.
This removes an assume_graph_lock() call in vmdk's implementation.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20230929145157.45443-20-kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
master
Kevin Wolf 2023-09-29 16:51:54 +02:00
parent 018f9dea9c
commit 3574499a1e
4 changed files with 10 additions and 8 deletions
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6
block/vmdk.c
View File

@ -2990,16 +2990,14 @@ vmdk_co_check(BlockDriverState *bs, BdrvCheckResult *result, BdrvCheckMode fix)
return ret;
}
static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs,
Error **errp)
static ImageInfoSpecific * GRAPH_RDLOCK
vmdk_get_specific_info(BlockDriverState *bs, Error **errp)
{
int i;
BDRVVmdkState *s = bs->opaque;
ImageInfoSpecific *spec_info = g_new0(ImageInfoSpecific, 1);
VmdkExtentInfoList **tail;
assume_graph_lock(); /* FIXME */
*spec_info = (ImageInfoSpecific){
.type = IMAGE_INFO_SPECIFIC_KIND_VMDK,
.u = {

5
include/block/block-io.h
View File

@ -198,8 +198,9 @@ bdrv_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
int co_wrapper_mixed_bdrv_rdlock
bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
ImageInfoSpecific *bdrv_get_specific_info(BlockDriverState *bs,
Error **errp);
ImageInfoSpecific * GRAPH_RDLOCK
bdrv_get_specific_info(BlockDriverState *bs, Error **errp);
BlockStatsSpecific *bdrv_get_specific_stats(BlockDriverState *bs);
void bdrv_round_to_subclusters(BlockDriverState *bs,
int64_t offset, int64_t bytes,

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

@ -728,8 +728,8 @@ struct BlockDriver {
int coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_get_info)(
BlockDriverState *bs, BlockDriverInfo *bdi);
ImageInfoSpecific *(*bdrv_get_specific_info)(BlockDriverState *bs,
Error **errp);
ImageInfoSpecific * GRAPH_RDLOCK_PTR (*bdrv_get_specific_info)(
BlockDriverState *bs, Error **errp);
BlockStatsSpecific *(*bdrv_get_specific_stats)(BlockDriverState *bs);
int coroutine_fn GRAPH_RDLOCK_PTR (*bdrv_co_save_vmstate)(

3
qemu-io-cmds.c
View File

@ -2037,6 +2037,9 @@ static int info_f(BlockBackend *blk, int argc, char **argv)
char s1[64], s2[64];
int ret;
GLOBAL_STATE_CODE();
GRAPH_RDLOCK_GUARD_MAINLOOP();
if (bs->drv && bs->drv->format_name) {
printf("format name: %s\n", bs->drv->format_name);
}