LXR linux/include/linux/sunrpc/xprtmultipath.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * RPC client multipathing definitions
   4 *
   5 * Copyright (c) 2015, 2016, Primary Data, Inc. All rights reserved.
   6 *
   7 * Trond Myklebust <trond.myklebust@primarydata.com>
   8 */
   9#ifndef _NET_SUNRPC_XPRTMULTIPATH_H
  10#define _NET_SUNRPC_XPRTMULTIPATH_H
  11
  12struct rpc_xprt_iter_ops;
  13struct rpc_xprt_switch {
  14        spinlock_t              xps_lock;
  15        struct kref             xps_kref;
  16
  17        unsigned int            xps_nxprts;
  18        unsigned int            xps_nactive;
  19        atomic_long_t           xps_queuelen;
  20        struct list_head        xps_xprt_list;
  21
  22        struct net *            xps_net;
  23
  24        const struct rpc_xprt_iter_ops *xps_iter_ops;
  25
  26        struct rcu_head         xps_rcu;
  27};
  28
  29struct rpc_xprt_iter {
  30        struct rpc_xprt_switch __rcu *xpi_xpswitch;
  31        struct rpc_xprt *       xpi_cursor;
  32
  33        const struct rpc_xprt_iter_ops *xpi_ops;
  34};
  35
  36
  37struct rpc_xprt_iter_ops {
  38        void (*xpi_rewind)(struct rpc_xprt_iter *);
  39        struct rpc_xprt *(*xpi_xprt)(struct rpc_xprt_iter *);
  40        struct rpc_xprt *(*xpi_next)(struct rpc_xprt_iter *);
  41};
  42
  43extern struct rpc_xprt_switch *xprt_switch_alloc(struct rpc_xprt *xprt,
  44                gfp_t gfp_flags);
  45
  46extern struct rpc_xprt_switch *xprt_switch_get(struct rpc_xprt_switch *xps);
  47extern void xprt_switch_put(struct rpc_xprt_switch *xps);
  48
  49extern void rpc_xprt_switch_set_roundrobin(struct rpc_xprt_switch *xps);
  50
  51extern void rpc_xprt_switch_add_xprt(struct rpc_xprt_switch *xps,
  52                struct rpc_xprt *xprt);
  53extern void rpc_xprt_switch_remove_xprt(struct rpc_xprt_switch *xps,
  54                struct rpc_xprt *xprt);
  55
  56extern void xprt_iter_init(struct rpc_xprt_iter *xpi,
  57                struct rpc_xprt_switch *xps);
  58
  59extern void xprt_iter_init_listall(struct rpc_xprt_iter *xpi,
  60                struct rpc_xprt_switch *xps);
  61
  62extern void xprt_iter_destroy(struct rpc_xprt_iter *xpi);
  63
  64extern struct rpc_xprt_switch *xprt_iter_xchg_switch(
  65                struct rpc_xprt_iter *xpi,
  66                struct rpc_xprt_switch *newswitch);
  67
  68extern struct rpc_xprt *xprt_iter_xprt(struct rpc_xprt_iter *xpi);
  69extern struct rpc_xprt *xprt_iter_get_xprt(struct rpc_xprt_iter *xpi);
  70extern struct rpc_xprt *xprt_iter_get_next(struct rpc_xprt_iter *xpi);
  71
  72extern bool rpc_xprt_switch_has_addr(struct rpc_xprt_switch *xps,
  73                const struct sockaddr *sap);
  74#endif
  75