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