| Trond Myklebust | 80b14d5 | 2015-02-14 20:31:59 -0500 | [diff] [blame] | 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 |