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_sysfs_xprt_switch;
  14struct rpc_xprt_switch {
  15        spinlock_t              xps_lock;
  16        struct kref             xps_kref;
  17
  18        unsigned int            xps_id;
  19        unsigned int            xps_nxprts;
  20        unsigned int            xps_nactive;
  21        unsigned int            xps_nunique_destaddr_xprts;
  22        atomic_long_t           xps_queuelen;
  23        struct list_head        xps_xprt_list;
  24
  25        struct net *            xps_net;
  26
  27        const struct rpc_xprt_iter_ops *xps_iter_ops;
  28
  29        struct rpc_sysfs_xprt_switch *xps_sysfs;
  30        struct rcu_head         xps_rcu;
  31};
  32
  33struct rpc_xprt_iter {
  34        struct rpc_xprt_switch __rcu *xpi_xpswitch;
  35        struct rpc_xprt *       xpi_cursor;
  36
  37        const struct rpc_xprt_iter_ops *xpi_ops;
  38};
  39
  40
  41struct rpc_xprt_iter_ops {
  42        void (*xpi_rewind)(struct rpc_xprt_iter *);
  43        struct rpc_xprt *(*xpi_xprt)(struct rpc_xprt_iter *);
  44        struct rpc_xprt *(*xpi_next)(struct rpc_xprt_iter *);
  45};
  46
  47extern struct rpc_xprt_switch *xprt_switch_alloc(struct rpc_xprt *xprt,
  48                gfp_t gfp_flags);
  49
  50extern struct rpc_xprt_switch *xprt_switch_get(struct rpc_xprt_switch *xps);
  51extern void xprt_switch_put(struct rpc_xprt_switch *xps);
  52
  53extern void rpc_xprt_switch_set_roundrobin(struct rpc_xprt_switch *xps);
  54
  55extern void rpc_xprt_switch_add_xprt(struct rpc_xprt_switch *xps,
  56                struct rpc_xprt *xprt);
  57extern void rpc_xprt_switch_remove_xprt(struct rpc_xprt_switch *xps,
  58                struct rpc_xprt *xprt);
  59
  60extern void xprt_iter_init(struct rpc_xprt_iter *xpi,
  61                struct rpc_xprt_switch *xps);
  62
  63extern void xprt_iter_init_listall(struct rpc_xprt_iter *xpi,
  64                struct rpc_xprt_switch *xps);
  65
  66extern void xprt_iter_destroy(struct rpc_xprt_iter *xpi);
  67
  68extern struct rpc_xprt_switch *xprt_iter_xchg_switch(
  69                struct rpc_xprt_iter *xpi,
  70                struct rpc_xprt_switch *newswitch);
  71
  72extern struct rpc_xprt *xprt_iter_xprt(struct rpc_xprt_iter *xpi);
  73extern struct rpc_xprt *xprt_iter_get_xprt(struct rpc_xprt_iter *xpi);
  74extern struct rpc_xprt *xprt_iter_get_next(struct rpc_xprt_iter *xpi);
  75
  76extern bool rpc_xprt_switch_has_addr(struct rpc_xprt_switch *xps,
  77                const struct sockaddr *sap);
  78
  79extern void xprt_multipath_cleanup_ids(void);
  80
  81#endif
  82