include/linux/sunrpc/xprtmultipath.h

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