XO_SOCKET asks for the opened inode to be verified as a socket, analogous to the existing XO_REGULAR. A new fd_verify_socket() helper is added to stat-util to perform the check on an opened fd. XO_TRIGGER_AUTOMOUNT asks O_PATH opens to trigger automounts by going via open_tree() without OPEN_TREE_CLONE, falling back to openat() if the kernel or sandbox rejects open_tree().
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