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block: Mark bdrv_skip_filters() and callers GRAPH_RDLOCK

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This adds GRAPH_RDLOCK annotations to declare that callers of
bdrv_skip_filters() need to hold a reader lock for the graph because it
calls bdrv_filter_child(), which accesses bs->file/backing.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20231027155333.420094-9-kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2023-10-27 17:53:17 +02:00
parent 430da832af
commit ad74751fc0
9 changed files with 77 additions and 31 deletions
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22
block/stream.c
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@ -53,8 +53,8 @@ static int coroutine_fn stream_populate(BlockBackend *blk,
static int stream_prepare(Job *job)
{
StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
BlockDriverState *unfiltered_bs = bdrv_skip_filters(s->target_bs);
BlockDriverState *unfiltered_bs_cow = bdrv_cow_bs(unfiltered_bs);
BlockDriverState *unfiltered_bs;
BlockDriverState *unfiltered_bs_cow;
BlockDriverState *base;
BlockDriverState *unfiltered_base;
Error *local_err = NULL;
@ -62,6 +62,11 @@ static int stream_prepare(Job *job)
GLOBAL_STATE_CODE();
bdrv_graph_rdlock_main_loop();
unfiltered_bs = bdrv_skip_filters(s->target_bs);
unfiltered_bs_cow = bdrv_cow_bs(unfiltered_bs);
bdrv_graph_rdunlock_main_loop();
/* We should drop filter at this point, as filter hold the backing chain */
bdrv_cor_filter_drop(s->cor_filter_bs);
s->cor_filter_bs = NULL;
@ -142,18 +147,19 @@ static void stream_clean(Job *job)
static int coroutine_fn stream_run(Job *job, Error **errp)
{
StreamBlockJob *s = container_of(job, StreamBlockJob, common.job);
BlockDriverState *unfiltered_bs = bdrv_skip_filters(s->target_bs);
BlockDriverState *unfiltered_bs;
int64_t len;
int64_t offset = 0;
int error = 0;
int64_t n = 0; /* bytes */
if (unfiltered_bs == s->base_overlay) {
/* Nothing to stream */
return 0;
}
WITH_GRAPH_RDLOCK_GUARD() {
unfiltered_bs = bdrv_skip_filters(s->target_bs);
if (unfiltered_bs == s->base_overlay) {
/* Nothing to stream */
return 0;
}
len = bdrv_co_getlength(s->target_bs);
if (len < 0) {
return len;