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 73