linux/include/net/af_rxrpc.h
David Howells b960a34b73 rxrpc: Allow the kernel to mark a call as being non-interruptible
Allow kernel services using AF_RXRPC to indicate that a call should be
non-interruptible.  This allows kafs to make things like lock-extension and
writeback data storage calls non-interruptible.

If this is set, signals will be ignored for operations on that call where
possible - such as waiting to get a call channel on an rxrpc connection.

It doesn't prevent UDP sendmsg from being interrupted, but that will be
handled by packet retransmission.

rxrpc_kernel_recv_data() isn't affected by this since that never waits,
preferring instead to return -EAGAIN and leave the waiting to the caller.

Userspace initiated calls can't be set to be uninterruptible at this time.

Signed-off-by: David Howells <dhowells@redhat.com>
2019-05-16 16:25:20 +01:00

76 lines
2.7 KiB
C

/* RxRPC kernel service interface definitions
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef _NET_RXRPC_H
#define _NET_RXRPC_H
#include <linux/rxrpc.h>
#include <linux/ktime.h>
struct key;
struct sock;
struct socket;
struct rxrpc_call;
/*
* Debug ID counter for tracing.
*/
extern atomic_t rxrpc_debug_id;
typedef void (*rxrpc_notify_rx_t)(struct sock *, struct rxrpc_call *,
unsigned long);
typedef void (*rxrpc_notify_end_tx_t)(struct sock *, struct rxrpc_call *,
unsigned long);
typedef void (*rxrpc_notify_new_call_t)(struct sock *, struct rxrpc_call *,
unsigned long);
typedef void (*rxrpc_discard_new_call_t)(struct rxrpc_call *, unsigned long);
typedef void (*rxrpc_user_attach_call_t)(struct rxrpc_call *, unsigned long);
void rxrpc_kernel_new_call_notification(struct socket *,
rxrpc_notify_new_call_t,
rxrpc_discard_new_call_t);
struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *,
struct sockaddr_rxrpc *,
struct key *,
unsigned long,
s64,
gfp_t,
rxrpc_notify_rx_t,
bool,
bool,
unsigned int);
int rxrpc_kernel_send_data(struct socket *, struct rxrpc_call *,
struct msghdr *, size_t,
rxrpc_notify_end_tx_t);
int rxrpc_kernel_recv_data(struct socket *, struct rxrpc_call *,
struct iov_iter *, bool, u32 *, u16 *);
bool rxrpc_kernel_abort_call(struct socket *, struct rxrpc_call *,
u32, int, const char *);
void rxrpc_kernel_end_call(struct socket *, struct rxrpc_call *);
void rxrpc_kernel_get_peer(struct socket *, struct rxrpc_call *,
struct sockaddr_rxrpc *);
u64 rxrpc_kernel_get_rtt(struct socket *, struct rxrpc_call *);
int rxrpc_kernel_charge_accept(struct socket *, rxrpc_notify_rx_t,
rxrpc_user_attach_call_t, unsigned long, gfp_t,
unsigned int);
void rxrpc_kernel_set_tx_length(struct socket *, struct rxrpc_call *, s64);
bool rxrpc_kernel_check_life(const struct socket *, const struct rxrpc_call *,
u32 *);
void rxrpc_kernel_probe_life(struct socket *, struct rxrpc_call *);
u32 rxrpc_kernel_get_epoch(struct socket *, struct rxrpc_call *);
bool rxrpc_kernel_get_reply_time(struct socket *, struct rxrpc_call *,
ktime_t *);
bool rxrpc_kernel_call_is_complete(struct rxrpc_call *);
void rxrpc_kernel_set_max_life(struct socket *, struct rxrpc_call *,
unsigned long);
#endif /* _NET_RXRPC_H */