nfs4_try_to_lock_slot 552 fs/nfs/callback_proc.c if (!nfs4_try_to_lock_slot(tbl, slot)) { nfs4_try_to_lock_slot 90 fs/nfs/nfs4session.h extern bool nfs4_try_to_lock_slot(struct nfs4_slot_table *tbl, struct nfs4_slot *slot);