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 <[email protected]> 8 */ 9 #ifndef _NET_SUNRPC_XPRTMULTIPATH_H 10 #define _NET_SUNRPC_XPRTMULTIPATH_H 11 12 struct rpc_xprt_iter_ops; 13 struct rpc_sysfs_xprt_switch; 14 struct 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 atomic_long_t xps_queuelen; 22 struct list_head xps_xprt_list; 23 24 struct net * xps_net; 25 26 const struct rpc_xprt_iter_ops *xps_iter_ops; 27 28 struct rpc_sysfs_xprt_switch *xps_sysfs; 29 struct rcu_head xps_rcu; 30 }; 31 32 struct rpc_xprt_iter { 33 struct rpc_xprt_switch __rcu *xpi_xpswitch; 34 struct rpc_xprt * xpi_cursor; 35 36 const struct rpc_xprt_iter_ops *xpi_ops; 37 }; 38 39 40 struct rpc_xprt_iter_ops { 41 void (*xpi_rewind)(struct rpc_xprt_iter *); 42 struct rpc_xprt *(*xpi_xprt)(struct rpc_xprt_iter *); 43 struct rpc_xprt *(*xpi_next)(struct rpc_xprt_iter *); 44 }; 45 46 extern struct rpc_xprt_switch *xprt_switch_alloc(struct rpc_xprt *xprt, 47 gfp_t gfp_flags); 48 49 extern struct rpc_xprt_switch *xprt_switch_get(struct rpc_xprt_switch *xps); 50 extern void xprt_switch_put(struct rpc_xprt_switch *xps); 51 52 extern void rpc_xprt_switch_set_roundrobin(struct rpc_xprt_switch *xps); 53 54 extern void rpc_xprt_switch_add_xprt(struct rpc_xprt_switch *xps, 55 struct rpc_xprt *xprt); 56 extern void rpc_xprt_switch_remove_xprt(struct rpc_xprt_switch *xps, 57 struct rpc_xprt *xprt); 58 59 extern void xprt_iter_init(struct rpc_xprt_iter *xpi, 60 struct rpc_xprt_switch *xps); 61 62 extern void xprt_iter_init_listall(struct rpc_xprt_iter *xpi, 63 struct rpc_xprt_switch *xps); 64 65 extern void xprt_iter_destroy(struct rpc_xprt_iter *xpi); 66 67 extern struct rpc_xprt_switch *xprt_iter_xchg_switch( 68 struct rpc_xprt_iter *xpi, 69 struct rpc_xprt_switch *newswitch); 70 71 extern struct rpc_xprt *xprt_iter_xprt(struct rpc_xprt_iter *xpi); 72 extern struct rpc_xprt *xprt_iter_get_xprt(struct rpc_xprt_iter *xpi); 73 extern struct rpc_xprt *xprt_iter_get_next(struct rpc_xprt_iter *xpi); 74 75 extern bool rpc_xprt_switch_has_addr(struct rpc_xprt_switch *xps, 76 const struct sockaddr *sap); 77 78 extern void xprt_multipath_cleanup_ids(void); 79 80 #endif 81