1 /*
2  * RPC client multipathing definitions
3  *
4  * Copyright (c) 2015, 2016, Primary Data, Inc. All rights reserved.
5  *
6  * Trond Myklebust <[email protected]>
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 extern bool rpc_xprt_switch_has_addr(struct rpc_xprt_switch *xps,
70 		const struct sockaddr *sap);
71 #endif
72