block: Block all nodes involved in the block-commit operation
After a successful block-commit operation all nodes between top and base are removed from the backing chain, and top's overlay needs to be updated to point to base. Because of that we should prevent other block jobs from messing with them. This patch blocks all operations in these nodes in commit_start(). Signed-off-by: NAlberto Garcia <berto@igalia.com> Reviewed-by: NKevin Wolf <kwolf@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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