root/include/linux/sunrpc/xprtmultipath.h

INCLUDED FROM

   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         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 
  29 struct 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 
  37 struct 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 
  43 extern struct rpc_xprt_switch *xprt_switch_alloc(struct rpc_xprt *xprt,
  44                 gfp_t gfp_flags);
  45 
  46 extern struct rpc_xprt_switch *xprt_switch_get(struct rpc_xprt_switch *xps);
  47 extern void xprt_switch_put(struct rpc_xprt_switch *xps);
  48 
  49 extern void rpc_xprt_switch_set_roundrobin(struct rpc_xprt_switch *xps);
  50 
  51 extern void rpc_xprt_switch_add_xprt(struct rpc_xprt_switch *xps,
  52                 struct rpc_xprt *xprt);
  53 extern void rpc_xprt_switch_remove_xprt(struct rpc_xprt_switch *xps,
  54                 struct rpc_xprt *xprt);
  55 
  56 extern void xprt_iter_init(struct rpc_xprt_iter *xpi,
  57                 struct rpc_xprt_switch *xps);
  58 
  59 extern void xprt_iter_init_listall(struct rpc_xprt_iter *xpi,
  60                 struct rpc_xprt_switch *xps);
  61 
  62 extern void xprt_iter_destroy(struct rpc_xprt_iter *xpi);
  63 
  64 extern struct rpc_xprt_switch *xprt_iter_xchg_switch(
  65                 struct rpc_xprt_iter *xpi,
  66                 struct rpc_xprt_switch *newswitch);
  67 
  68 extern struct rpc_xprt *xprt_iter_xprt(struct rpc_xprt_iter *xpi);
  69 extern struct rpc_xprt *xprt_iter_get_xprt(struct rpc_xprt_iter *xpi);
  70 extern struct rpc_xprt *xprt_iter_get_next(struct rpc_xprt_iter *xpi);
  71 
  72 extern bool rpc_xprt_switch_has_addr(struct rpc_xprt_switch *xps,
  73                 const struct sockaddr *sap);
  74 #endif