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blkverify: Add locking for request_fn
This is either bdrv_co_preadv() or bdrv_co_pwritev() which both need to have the graph locked. Annotate the function pointer accordingly and add locking to its callers. This shouldn't actually have resulted in a bug because the graph lock is already held by blkverify_co_prwv(), which waits for the coroutines to terminate. Annotate with GRAPH_RDLOCK as well to make this clearer. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-ID: <20231027155333.420094-19-kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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