include/linux/sunrpc/xprt.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  linux/include/linux/sunrpc/xprt.h
   4  *
   5  *  Declarations for the RPC transport interface.
   6  *
   7  *  Copyright (C) 1995, 1996 Olaf Kirch <[email protected]>
   8  */
   9
  10 #ifndef _LINUX_SUNRPC_XPRT_H
  11 #define _LINUX_SUNRPC_XPRT_H
  12
  13 #include <linux/uio.h>
  14 #include <linux/socket.h>
  15 #include <linux/in.h>
  16 #include <linux/ktime.h>
  17 #include <linux/kref.h>
  18 #include <linux/sunrpc/sched.h>
  19 #include <linux/sunrpc/xdr.h>
  20 #include <linux/sunrpc/msg_prot.h>
  21
  22 #define RPC_MIN_SLOT_TABLE      (2U)
  23 #define RPC_DEF_SLOT_TABLE      (16U)
  24 #define RPC_MAX_SLOT_TABLE_LIMIT        (65536U)
  25 #define RPC_MAX_SLOT_TABLE      RPC_MAX_SLOT_TABLE_LIMIT
  26
  27 #define RPC_CWNDSHIFT           (8U)
  28 #define RPC_CWNDSCALE           (1U << RPC_CWNDSHIFT)
  29 #define RPC_INITCWND            RPC_CWNDSCALE
  30 #define RPC_MAXCWND(xprt)       ((xprt)->max_reqs << RPC_CWNDSHIFT)
  31 #define RPCXPRT_CONGESTED(xprt) ((xprt)->cong >= (xprt)->cwnd)
  32
  33 /*
  34  * This describes a timeout strategy
  35  */
  36 struct rpc_timeout {
  37         unsigned long           to_initval,             /* initial timeout */
  38                                 to_maxval,              /* max timeout */
  39                                 to_increment;           /* if !exponential */
  40         unsigned int            to_retries;             /* max # of retries */
  41         unsigned char           to_exponential;
  42 };
  43
  44 enum rpc_display_format_t {
  45         RPC_DISPLAY_ADDR = 0,
  46         RPC_DISPLAY_PORT,
  47         RPC_DISPLAY_PROTO,
  48         RPC_DISPLAY_HEX_ADDR,
  49         RPC_DISPLAY_HEX_PORT,
  50         RPC_DISPLAY_NETID,
  51         RPC_DISPLAY_MAX,
  52 };
  53
  54 struct rpc_task;
  55 struct rpc_xprt;
  56 struct xprt_class;
  57 struct seq_file;
  58 struct svc_serv;
  59 struct net;
  60
  61 /*
  62  * This describes a complete RPC request
  63  */
  64 struct rpc_rqst {
  65         /*
  66          * This is the user-visible part
  67          */
  68         struct rpc_xprt *       rq_xprt;                /* RPC client */
  69         struct xdr_buf          rq_snd_buf;             /* send buffer */
  70         struct xdr_buf          rq_rcv_buf;             /* recv buffer */
  71
  72         /*
  73          * This is the private part
  74          */
  75         struct rpc_task *       rq_task;        /* RPC task data */
  76         struct rpc_cred *       rq_cred;        /* Bound cred */
  77         __be32                  rq_xid;         /* request XID */
  78         int                     rq_cong;        /* has incremented xprt->cong */
  79         u32                     rq_seqno;       /* gss seq no. used on req. */
  80         int                     rq_enc_pages_num;
  81         struct page             **rq_enc_pages; /* scratch pages for use by
  82                                                    gss privacy code */
  83         void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */
  84
  85         union {
  86                 struct list_head        rq_list;        /* Slot allocation list */
  87                 struct rb_node          rq_recv;        /* Receive queue */
  88         };
  89
  90         struct list_head        rq_xmit;        /* Send queue */
  91         struct list_head        rq_xmit2;       /* Send queue */
  92
  93         void                    *rq_buffer;     /* Call XDR encode buffer */
  94         size_t                  rq_callsize;
  95         void                    *rq_rbuffer;    /* Reply XDR decode buffer */
  96         size_t                  rq_rcvsize;
  97         size_t                  rq_xmit_bytes_sent;     /* total bytes sent */
  98         size_t                  rq_reply_bytes_recvd;   /* total reply bytes */
  99                                                         /* received */
 100
 101         struct xdr_buf          rq_private_buf;         /* The receive buffer
 102                                                          * used in the softirq.
 103                                                          */
 104         unsigned long           rq_majortimeo;  /* major timeout alarm */
 105         unsigned long           rq_minortimeo;  /* minor timeout alarm */
 106         unsigned long           rq_timeout;     /* Current timeout value */
 107         ktime_t                 rq_rtt;         /* round-trip time */
 108         unsigned int            rq_retries;     /* # of retries */
 109         unsigned int            rq_connect_cookie;
 110                                                 /* A cookie used to track the
 111                                                    state of the transport
 112                                                    connection */
 113         atomic_t                rq_pin;
 114
 115         /*
 116          * Partial send handling
 117          */
 118         u32                     rq_bytes_sent;  /* Bytes we have sent */
 119
 120         ktime_t                 rq_xtime;       /* transmit time stamp */
 121         int                     rq_ntrans;
 122
 123 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
 124         struct list_head        rq_bc_list;     /* Callback service list */
 125         unsigned long           rq_bc_pa_state; /* Backchannel prealloc state */
 126         struct list_head        rq_bc_pa_list;  /* Backchannel prealloc list */
 127 #endif /* CONFIG_SUNRPC_BACKCHANEL */
 128 };
 129 #define rq_svec                 rq_snd_buf.head
 130 #define rq_slen                 rq_snd_buf.len
 131
 132 /* RPC transport layer security policies */
 133 enum xprtsec_policies {
 134         RPC_XPRTSEC_NONE = 0,
 135         RPC_XPRTSEC_TLS_ANON,
 136         RPC_XPRTSEC_TLS_X509,
 137 };
 138
 139 struct xprtsec_parms {
 140         enum xprtsec_policies   policy;
 141
 142         /* authentication material */
 143         key_serial_t            cert_serial;
 144         key_serial_t            privkey_serial;
 145 };
 146
 147 struct rpc_xprt_ops {
 148         void            (*set_buffer_size)(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize);
 149         int             (*reserve_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
 150         void            (*release_xprt)(struct rpc_xprt *xprt, struct rpc_task *task);
 151         void            (*alloc_slot)(struct rpc_xprt *xprt, struct rpc_task *task);
 152         void            (*free_slot)(struct rpc_xprt *xprt,
 153                                      struct rpc_rqst *req);
 154         void            (*rpcbind)(struct rpc_task *task);
 155         void            (*set_port)(struct rpc_xprt *xprt, unsigned short port);
 156         void            (*connect)(struct rpc_xprt *xprt, struct rpc_task *task);
 157         int             (*get_srcaddr)(struct rpc_xprt *xprt, char *buf,
 158                                        size_t buflen);
 159         unsigned short  (*get_srcport)(struct rpc_xprt *xprt);
 160         int             (*buf_alloc)(struct rpc_task *task);
 161         void            (*buf_free)(struct rpc_task *task);
 162         int             (*prepare_request)(struct rpc_rqst *req,
 163                                            struct xdr_buf *buf);
 164         int             (*send_request)(struct rpc_rqst *req);
 165         void            (*wait_for_reply_request)(struct rpc_task *task);
 166         void            (*timer)(struct rpc_xprt *xprt, struct rpc_task *task);
 167         void            (*release_request)(struct rpc_task *task);
 168         void            (*close)(struct rpc_xprt *xprt);
 169         void            (*destroy)(struct rpc_xprt *xprt);
 170         void            (*set_connect_timeout)(struct rpc_xprt *xprt,
 171                                         unsigned long connect_timeout,
 172                                         unsigned long reconnect_timeout);
 173         void            (*print_stats)(struct rpc_xprt *xprt, struct seq_file *seq);
 174         int             (*enable_swap)(struct rpc_xprt *xprt);
 175         void            (*disable_swap)(struct rpc_xprt *xprt);
 176         void            (*inject_disconnect)(struct rpc_xprt *xprt);
 177         int             (*bc_setup)(struct rpc_xprt *xprt,
 178                                     unsigned int min_reqs);
 179         size_t          (*bc_maxpayload)(struct rpc_xprt *xprt);
 180         unsigned int    (*bc_num_slots)(struct rpc_xprt *xprt);
 181         void            (*bc_free_rqst)(struct rpc_rqst *rqst);
 182         void            (*bc_destroy)(struct rpc_xprt *xprt,
 183                                       unsigned int max_reqs);
 184 };
 185
 186 /*
 187  * RPC transport identifiers
 188  *
 189  * To preserve compatibility with the historical use of raw IP protocol
 190  * id's for transport selection, UDP and TCP identifiers are specified
 191  * with the previous values. No such restriction exists for new transports,
 192  * except that they may not collide with these values (17 and 6,
 193  * respectively).
 194  */
 195 #define XPRT_TRANSPORT_BC       (1 << 31)
 196 enum xprt_transports {
 197         XPRT_TRANSPORT_UDP      = IPPROTO_UDP,
 198         XPRT_TRANSPORT_TCP      = IPPROTO_TCP,
 199         XPRT_TRANSPORT_BC_TCP   = IPPROTO_TCP | XPRT_TRANSPORT_BC,
 200         XPRT_TRANSPORT_RDMA     = 256,
 201         XPRT_TRANSPORT_BC_RDMA  = XPRT_TRANSPORT_RDMA | XPRT_TRANSPORT_BC,
 202         XPRT_TRANSPORT_LOCAL    = 257,
 203         XPRT_TRANSPORT_TCP_TLS  = 258,
 204 };
 205
 206 struct rpc_sysfs_xprt;
 207 struct rpc_xprt {
 208         struct kref             kref;           /* Reference count */
 209         const struct rpc_xprt_ops *ops;         /* transport methods */
 210         unsigned int            id;             /* transport id */
 211
 212         const struct rpc_timeout *timeout;      /* timeout parms */
 213         struct sockaddr_storage addr;           /* server address */
 214         size_t                  addrlen;        /* size of server address */
 215         int                     prot;           /* IP protocol */
 216
 217         unsigned long           cong;           /* current congestion */
 218         unsigned long           cwnd;           /* congestion window */
 219
 220         size_t                  max_payload;    /* largest RPC payload size,
 221                                                    in bytes */
 222
 223         struct rpc_wait_queue   binding;        /* requests waiting on rpcbind */
 224         struct rpc_wait_queue   sending;        /* requests waiting to send */
 225         struct rpc_wait_queue   pending;        /* requests in flight */
 226         struct rpc_wait_queue   backlog;        /* waiting for slot */
 227         struct list_head        free;           /* free slots */
 228         unsigned int            max_reqs;       /* max number of slots */
 229         unsigned int            min_reqs;       /* min number of slots */
 230         unsigned int            num_reqs;       /* total slots */
 231         unsigned long           state;          /* transport state */
 232         unsigned char           resvport   : 1, /* use a reserved port */
 233                                 reuseport  : 1; /* reuse port on reconnect */
 234         atomic_t                swapper;        /* we're swapping over this
 235                                                    transport */
 236         unsigned int            bind_index;     /* bind function index */
 237
 238         /*
 239          * Multipath
 240          */
 241         struct list_head        xprt_switch;
 242
 243         /*
 244          * Connection of transports
 245          */
 246         unsigned long           bind_timeout,
 247                                 reestablish_timeout;
 248         struct xprtsec_parms    xprtsec;
 249         unsigned int            connect_cookie; /* A cookie that gets bumped
 250                                                    every time the transport
 251                                                    is reconnected */
 252
 253         /*
 254          * Disconnection of idle transports
 255          */
 256         struct work_struct      task_cleanup;
 257         struct timer_list       timer;
 258         unsigned long           last_used,
 259                                 idle_timeout,
 260                                 connect_timeout,
 261                                 max_reconnect_timeout;
 262
 263         /*
 264          * Send stuff
 265          */
 266         atomic_long_t           queuelen;
 267         spinlock_t              transport_lock; /* lock transport info */
 268         spinlock_t              reserve_lock;   /* lock slot table */
 269         spinlock_t              queue_lock;     /* send/receive queue lock */
 270         u32                     xid;            /* Next XID value to use */
 271         struct rpc_task *       snd_task;       /* Task blocked in send */
 272
 273         struct list_head        xmit_queue;     /* Send queue */
 274         atomic_long_t           xmit_queuelen;
 275
 276         struct svc_xprt         *bc_xprt;       /* NFSv4.1 backchannel */
 277 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
 278         struct svc_serv         *bc_serv;       /* The RPC service which will */
 279                                                 /* process the callback */
 280         unsigned int            bc_alloc_max;
 281         unsigned int            bc_alloc_count; /* Total number of preallocs */
 282         atomic_t                bc_slot_count;  /* Number of allocated slots */
 283         spinlock_t              bc_pa_lock;     /* Protects the preallocated
 284                                                  * items */
 285         struct list_head        bc_pa_list;     /* List of preallocated
 286                                                  * backchannel rpc_rqst's */
 287 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
 288
 289         struct rb_root          recv_queue;     /* Receive queue */
 290
 291         struct {
 292                 unsigned long           bind_count,     /* total number of binds */
 293                                         connect_count,  /* total number of connects */
 294                                         connect_start,  /* connect start timestamp */
 295                                         connect_time,   /* jiffies waiting for connect */
 296                                         sends,          /* how many complete requests */
 297                                         recvs,          /* how many complete requests */
 298                                         bad_xids,       /* lookup_rqst didn't find XID */
 299                                         max_slots;      /* max rpc_slots used */
 300
 301                 unsigned long long      req_u,          /* average requests on the wire */
 302                                         bklog_u,        /* backlog queue utilization */
 303                                         sending_u,      /* send q utilization */
 304                                         pending_u;      /* pend q utilization */
 305         } stat;
 306
 307         struct net              *xprt_net;
 308         netns_tracker           ns_tracker;
 309         const char              *servername;
 310         const char              *address_strings[RPC_DISPLAY_MAX];
 311 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
 312         struct dentry           *debugfs;               /* debugfs directory */
 313 #endif
 314         struct rcu_head         rcu;
 315         const struct xprt_class *xprt_class;
 316         struct rpc_sysfs_xprt   *xprt_sysfs;
 317         bool                    main; /*mark if this is the 1st transport */
 318 };
 319
 320 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
 321 /*
 322  * Backchannel flags
 323  */
 324 #define RPC_BC_PA_IN_USE        0x0001          /* Preallocated backchannel */
 325                                                 /* buffer in use */
 326 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
 327
 328 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
 329 static inline int bc_prealloc(struct rpc_rqst *req)
 330 {
 331         return test_bit(RPC_BC_PA_IN_USE, &req->rq_bc_pa_state);
 332 }
 333 #else
 334 static inline int bc_prealloc(struct rpc_rqst *req)
 335 {
 336         return 0;
 337 }
 338 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
 339
 340 #define XPRT_CREATE_INFINITE_SLOTS      (1U)
 341 #define XPRT_CREATE_NO_IDLE_TIMEOUT     (1U << 1)
 342
 343 struct xprt_create {
 344         int                     ident;          /* XPRT_TRANSPORT identifier */
 345         struct net *            net;
 346         struct sockaddr *       srcaddr;        /* optional local address */
 347         struct sockaddr *       dstaddr;        /* remote peer address */
 348         size_t                  addrlen;
 349         const char              *servername;
 350         struct svc_xprt         *bc_xprt;       /* NFSv4.1 backchannel */
 351         struct rpc_xprt_switch  *bc_xps;
 352         unsigned int            flags;
 353         struct xprtsec_parms    xprtsec;
 354         unsigned long           connect_timeout;
 355         unsigned long           reconnect_timeout;
 356 };
 357
 358 struct xprt_class {
 359         struct list_head        list;
 360         int                     ident;          /* XPRT_TRANSPORT identifier */
 361         struct rpc_xprt *       (*setup)(struct xprt_create *);
 362         struct module           *owner;
 363         char                    name[32];
 364         const char *            netid[];
 365 };
 366
 367 /*
 368  * Generic internal transport functions
 369  */
 370 struct rpc_xprt         *xprt_create_transport(struct xprt_create *args);
 371 void                    xprt_connect(struct rpc_task *task);
 372 unsigned long           xprt_reconnect_delay(const struct rpc_xprt *xprt);
 373 void                    xprt_reconnect_backoff(struct rpc_xprt *xprt,
 374                                                unsigned long init_to);
 375 void                    xprt_reserve(struct rpc_task *task);
 376 void                    xprt_retry_reserve(struct rpc_task *task);
 377 int                     xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
 378 int                     xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
 379 void                    xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task);
 380 void                    xprt_free_slot(struct rpc_xprt *xprt,
 381                                        struct rpc_rqst *req);
 382 bool                    xprt_prepare_transmit(struct rpc_task *task);
 383 void                    xprt_request_enqueue_transmit(struct rpc_task *task);
 384 int                     xprt_request_enqueue_receive(struct rpc_task *task);
 385 void                    xprt_request_wait_receive(struct rpc_task *task);
 386 void                    xprt_request_dequeue_xprt(struct rpc_task *task);
 387 bool                    xprt_request_need_retransmit(struct rpc_task *task);
 388 void                    xprt_transmit(struct rpc_task *task);
 389 void                    xprt_end_transmit(struct rpc_task *task);
 390 int                     xprt_adjust_timeout(struct rpc_rqst *req);
 391 void                    xprt_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task);
 392 void                    xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task);
 393 void                    xprt_release(struct rpc_task *task);
 394 struct rpc_xprt *       xprt_get(struct rpc_xprt *xprt);
 395 void                    xprt_put(struct rpc_xprt *xprt);
 396 struct rpc_xprt *       xprt_alloc(struct net *net, size_t size,
 397                                 unsigned int num_prealloc,
 398                                 unsigned int max_req);
 399 void                    xprt_free(struct rpc_xprt *);
 400 void                    xprt_add_backlog(struct rpc_xprt *xprt, struct rpc_task *task);
 401 bool                    xprt_wake_up_backlog(struct rpc_xprt *xprt, struct rpc_rqst *req);
 402 void                    xprt_cleanup_ids(void);
 403
 404 static inline int
 405 xprt_enable_swap(struct rpc_xprt *xprt)
 406 {
 407         return xprt->ops->enable_swap(xprt);
 408 }
 409
 410 static inline void
 411 xprt_disable_swap(struct rpc_xprt *xprt)
 412 {
 413         xprt->ops->disable_swap(xprt);
 414 }
 415
 416 /*
 417  * Transport switch helper functions
 418  */
 419 int                     xprt_register_transport(struct xprt_class *type);
 420 int                     xprt_unregister_transport(struct xprt_class *type);
 421 int                     xprt_find_transport_ident(const char *);
 422 void                    xprt_wait_for_reply_request_def(struct rpc_task *task);
 423 void                    xprt_wait_for_reply_request_rtt(struct rpc_task *task);
 424 void                    xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status);
 425 void                    xprt_wait_for_buffer_space(struct rpc_xprt *xprt);
 426 bool                    xprt_write_space(struct rpc_xprt *xprt);
 427 void                    xprt_adjust_cwnd(struct rpc_xprt *xprt, struct rpc_task *task, int result);
 428 struct rpc_rqst *       xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid);
 429 void                    xprt_update_rtt(struct rpc_task *task);
 430 void                    xprt_complete_rqst(struct rpc_task *task, int copied);
 431 void                    xprt_pin_rqst(struct rpc_rqst *req);
 432 void                    xprt_unpin_rqst(struct rpc_rqst *req);
 433 void                    xprt_release_rqst_cong(struct rpc_task *task);
 434 bool                    xprt_request_get_cong(struct rpc_xprt *xprt, struct rpc_rqst *req);
 435 void                    xprt_disconnect_done(struct rpc_xprt *xprt);
 436 void                    xprt_force_disconnect(struct rpc_xprt *xprt);
 437 void                    xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie);
 438
 439 bool                    xprt_lock_connect(struct rpc_xprt *, struct rpc_task *, void *);
 440 void                    xprt_unlock_connect(struct rpc_xprt *, void *);
 441 void                    xprt_release_write(struct rpc_xprt *, struct rpc_task *);
 442
 443 /*
 444  * Reserved bit positions in xprt->state
 445  */
 446 #define XPRT_LOCKED             (0)
 447 #define XPRT_CONNECTED          (1)
 448 #define XPRT_CONNECTING         (2)
 449 #define XPRT_CLOSE_WAIT         (3)
 450 #define XPRT_BOUND              (4)
 451 #define XPRT_BINDING            (5)
 452 #define XPRT_CLOSING            (6)
 453 #define XPRT_OFFLINE            (7)
 454 #define XPRT_REMOVE             (8)
 455 #define XPRT_CONGESTED          (9)
 456 #define XPRT_CWND_WAIT          (10)
 457 #define XPRT_WRITE_SPACE        (11)
 458 #define XPRT_SND_IS_COOKIE      (12)
 459
 460 static inline void xprt_set_connected(struct rpc_xprt *xprt)
 461 {
 462         set_bit(XPRT_CONNECTED, &xprt->state);
 463 }
 464
 465 static inline void xprt_clear_connected(struct rpc_xprt *xprt)
 466 {
 467         clear_bit(XPRT_CONNECTED, &xprt->state);
 468 }
 469
 470 static inline int xprt_connected(struct rpc_xprt *xprt)
 471 {
 472         return test_bit(XPRT_CONNECTED, &xprt->state);
 473 }
 474
 475 static inline int xprt_test_and_set_connected(struct rpc_xprt *xprt)
 476 {
 477         return test_and_set_bit(XPRT_CONNECTED, &xprt->state);
 478 }
 479
 480 static inline int xprt_test_and_clear_connected(struct rpc_xprt *xprt)
 481 {
 482         return test_and_clear_bit(XPRT_CONNECTED, &xprt->state);
 483 }
 484
 485 static inline void xprt_clear_connecting(struct rpc_xprt *xprt)
 486 {
 487         smp_mb__before_atomic();
 488         clear_bit(XPRT_CONNECTING, &xprt->state);
 489         smp_mb__after_atomic();
 490 }
 491
 492 static inline int xprt_connecting(struct rpc_xprt *xprt)
 493 {
 494         return test_bit(XPRT_CONNECTING, &xprt->state);
 495 }
 496
 497 static inline int xprt_test_and_set_connecting(struct rpc_xprt *xprt)
 498 {
 499         return test_and_set_bit(XPRT_CONNECTING, &xprt->state);
 500 }
 501
 502 static inline void xprt_set_bound(struct rpc_xprt *xprt)
 503 {
 504         test_and_set_bit(XPRT_BOUND, &xprt->state);
 505 }
 506
 507 static inline int xprt_bound(struct rpc_xprt *xprt)
 508 {
 509         return test_bit(XPRT_BOUND, &xprt->state);
 510 }
 511
 512 static inline void xprt_clear_bound(struct rpc_xprt *xprt)
 513 {
 514         clear_bit(XPRT_BOUND, &xprt->state);
 515 }
 516
 517 static inline void xprt_clear_binding(struct rpc_xprt *xprt)
 518 {
 519         smp_mb__before_atomic();
 520         clear_bit(XPRT_BINDING, &xprt->state);
 521         smp_mb__after_atomic();
 522 }
 523
 524 static inline int xprt_test_and_set_binding(struct rpc_xprt *xprt)
 525 {
 526         return test_and_set_bit(XPRT_BINDING, &xprt->state);
 527 }
 528
 529 void xprt_set_offline_locked(struct rpc_xprt *xprt, struct rpc_xprt_switch *xps);
 530 void xprt_set_online_locked(struct rpc_xprt *xprt, struct rpc_xprt_switch *xps);
 531 void xprt_delete_locked(struct rpc_xprt *xprt, struct rpc_xprt_switch *xps);
 532 #endif /* _LINUX_SUNRPC_XPRT_H */