net/sunrpc/xprtsock.c

   1 /*
   2  * linux/net/sunrpc/xprtsock.c
   3  *
   4  * Client-side transport implementation for sockets.
   5  *
   6  * TCP callback races fixes (C) 1998 Red Hat
   7  * TCP send fixes (C) 1998 Red Hat
   8  * TCP NFS related read + write fixes
   9  *  (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
  10  *
  11  * Rewrite of larges part of the code in order to stabilize TCP stuff.
  12  * Fix behaviour when socket buffer is full.
  13  *  (C) 1999 Trond Myklebust <trond.myklebust@fys.uio.no>
  14  *
  15  * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
  16  *
  17  * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
  18  *   <gilles.quillard@bull.net>
  19  */
  20
  21 #include <linux/types.h>
  22 #include <linux/string.h>
  23 #include <linux/slab.h>
  24 #include <linux/module.h>
  25 #include <linux/capability.h>
  26 #include <linux/pagemap.h>
  27 #include <linux/errno.h>
  28 #include <linux/socket.h>
  29 #include <linux/in.h>
  30 #include <linux/net.h>
  31 #include <linux/mm.h>
  32 #include <linux/un.h>
  33 #include <linux/udp.h>
  34 #include <linux/tcp.h>
  35 #include <linux/sunrpc/clnt.h>
  36 #include <linux/sunrpc/addr.h>
  37 #include <linux/sunrpc/sched.h>
  38 #include <linux/sunrpc/svcsock.h>
  39 #include <linux/sunrpc/xprtsock.h>
  40 #include <linux/file.h>
  41 #ifdef CONFIG_SUNRPC_BACKCHANNEL
  42 #include <linux/sunrpc/bc_xprt.h>
  43 #endif
  44
  45 #include <net/sock.h>
  46 #include <net/checksum.h>
  47 #include <net/udp.h>
  48 #include <net/tcp.h>
  49
  50 #include <trace/events/sunrpc.h>
  51
  52 #include "sunrpc.h"
  53
  54 static void xs_close(struct rpc_xprt *xprt);
  55
  56 /*
  57  * xprtsock tunables
  58  */
  59 static unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
  60 static unsigned int xprt_tcp_slot_table_entries = RPC_MIN_SLOT_TABLE;
  61 static unsigned int xprt_max_tcp_slot_table_entries = RPC_MAX_SLOT_TABLE;
  62
  63 static unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
  64 static unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
  65
  66 #define XS_TCP_LINGER_TO        (15U * HZ)
  67 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
  68
  69 /*
  70  * We can register our own files under /proc/sys/sunrpc by
  71  * calling register_sysctl_table() again.  The files in that
  72  * directory become the union of all files registered there.
  73  *
  74  * We simply need to make sure that we don't collide with
  75  * someone else's file names!
  76  */
  77
  78 #ifdef RPC_DEBUG
  79
  80 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
  81 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
  82 static unsigned int max_tcp_slot_table_limit = RPC_MAX_SLOT_TABLE_LIMIT;
  83 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
  84 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
  85
  86 static struct ctl_table_header *sunrpc_table_header;
  87
  88 /*
  89  * FIXME: changing the UDP slot table size should also resize the UDP
  90  *        socket buffers for existing UDP transports
  91  */
  92 static struct ctl_table xs_tunables_table[] = {
  93         {
  94                 .procname       = "udp_slot_table_entries",
  95                 .data           = &xprt_udp_slot_table_entries,
  96                 .maxlen         = sizeof(unsigned int),
  97                 .mode           = 0644,
  98                 .proc_handler   = proc_dointvec_minmax,
  99                 .extra1         = &min_slot_table_size,
 100                 .extra2         = &max_slot_table_size
 101         },
 102         {
 103                 .procname       = "tcp_slot_table_entries",
 104                 .data           = &xprt_tcp_slot_table_entries,
 105                 .maxlen         = sizeof(unsigned int),
 106                 .mode           = 0644,
 107                 .proc_handler   = proc_dointvec_minmax,
 108                 .extra1         = &min_slot_table_size,
 109                 .extra2         = &max_slot_table_size
 110         },
 111         {
 112                 .procname       = "tcp_max_slot_table_entries",
 113                 .data           = &xprt_max_tcp_slot_table_entries,
 114                 .maxlen         = sizeof(unsigned int),
 115                 .mode           = 0644,
 116                 .proc_handler   = proc_dointvec_minmax,
 117                 .extra1         = &min_slot_table_size,
 118                 .extra2         = &max_tcp_slot_table_limit
 119         },
 120         {
 121                 .procname       = "min_resvport",
 122                 .data           = &xprt_min_resvport,
 123                 .maxlen         = sizeof(unsigned int),
 124                 .mode           = 0644,
 125                 .proc_handler   = proc_dointvec_minmax,
 126                 .extra1         = &xprt_min_resvport_limit,
 127                 .extra2         = &xprt_max_resvport_limit
 128         },
 129         {
 130                 .procname       = "max_resvport",
 131                 .data           = &xprt_max_resvport,
 132                 .maxlen         = sizeof(unsigned int),
 133                 .mode           = 0644,
 134                 .proc_handler   = proc_dointvec_minmax,
 135                 .extra1         = &xprt_min_resvport_limit,
 136                 .extra2         = &xprt_max_resvport_limit
 137         },
 138         {
 139                 .procname       = "tcp_fin_timeout",
 140                 .data           = &xs_tcp_fin_timeout,
 141                 .maxlen         = sizeof(xs_tcp_fin_timeout),
 142                 .mode           = 0644,
 143                 .proc_handler   = proc_dointvec_jiffies,
 144         },
 145         { },
 146 };
 147
 148 static struct ctl_table sunrpc_table[] = {
 149         {
 150                 .procname       = "sunrpc",
 151                 .mode           = 0555,
 152                 .child          = xs_tunables_table
 153         },
 154         { },
 155 };
 156
 157 #endif
 158
 159 /*
 160  * Wait duration for a reply from the RPC portmapper.
 161  */
 162 #define XS_BIND_TO              (60U * HZ)
 163
 164 /*
 165  * Delay if a UDP socket connect error occurs.  This is most likely some
 166  * kind of resource problem on the local host.
 167  */
 168 #define XS_UDP_REEST_TO         (2U * HZ)
 169
 170 /*
 171  * The reestablish timeout allows clients to delay for a bit before attempting
 172  * to reconnect to a server that just dropped our connection.
 173  *
 174  * We implement an exponential backoff when trying to reestablish a TCP
 175  * transport connection with the server.  Some servers like to drop a TCP
 176  * connection when they are overworked, so we start with a short timeout and
 177  * increase over time if the server is down or not responding.
 178  */
 179 #define XS_TCP_INIT_REEST_TO    (3U * HZ)
 180 #define XS_TCP_MAX_REEST_TO     (5U * 60 * HZ)
 181
 182 /*
 183  * TCP idle timeout; client drops the transport socket if it is idle
 184  * for this long.  Note that we also timeout UDP sockets to prevent
 185  * holding port numbers when there is no RPC traffic.
 186  */
 187 #define XS_IDLE_DISC_TO         (5U * 60 * HZ)
 188
 189 #ifdef RPC_DEBUG
 190 # undef  RPC_DEBUG_DATA
 191 # define RPCDBG_FACILITY        RPCDBG_TRANS
 192 #endif
 193
 194 #ifdef RPC_DEBUG_DATA
 195 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
 196 {
 197         u8 *buf = (u8 *) packet;
 198         int j;
 199
 200         dprintk("RPC:       %s\n", msg);
 201         for (j = 0; j < count && j < 128; j += 4) {
 202                 if (!(j & 31)) {
 203                         if (j)
 204                                 dprintk("\n");
 205                         dprintk("0x%04x ", j);
 206                 }
 207                 dprintk("%02x%02x%02x%02x ",
 208                         buf[j], buf[j+1], buf[j+2], buf[j+3]);
 209         }
 210         dprintk("\n");
 211 }
 212 #else
 213 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
 214 {
 215         /* NOP */
 216 }
 217 #endif
 218
 219 struct sock_xprt {
 220         struct rpc_xprt         xprt;
 221
 222         /*
 223          * Network layer
 224          */
 225         struct socket *         sock;
 226         struct sock *           inet;
 227
 228         /*
 229          * State of TCP reply receive
 230          */
 231         __be32                  tcp_fraghdr,
 232                                 tcp_xid,
 233                                 tcp_calldir;
 234
 235         u32                     tcp_offset,
 236                                 tcp_reclen;
 237
 238         unsigned long           tcp_copied,
 239                                 tcp_flags;
 240
 241         /*
 242          * Connection of transports
 243          */
 244         struct delayed_work     connect_worker;
 245         struct sockaddr_storage srcaddr;
 246         unsigned short          srcport;
 247
 248         /*
 249          * UDP socket buffer size parameters
 250          */
 251         size_t                  rcvsize,
 252                                 sndsize;
 253
 254         /*
 255          * Saved socket callback addresses
 256          */
 257         void                    (*old_data_ready)(struct sock *, int);
 258         void                    (*old_state_change)(struct sock *);
 259         void                    (*old_write_space)(struct sock *);
 260         void                    (*old_error_report)(struct sock *);
 261 };
 262
 263 /*
 264  * TCP receive state flags
 265  */
 266 #define TCP_RCV_LAST_FRAG       (1UL << 0)
 267 #define TCP_RCV_COPY_FRAGHDR    (1UL << 1)
 268 #define TCP_RCV_COPY_XID        (1UL << 2)
 269 #define TCP_RCV_COPY_DATA       (1UL << 3)
 270 #define TCP_RCV_READ_CALLDIR    (1UL << 4)
 271 #define TCP_RCV_COPY_CALLDIR    (1UL << 5)
 272
 273 /*
 274  * TCP RPC flags
 275  */
 276 #define TCP_RPC_REPLY           (1UL << 6)
 277
 278 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
 279 {
 280         return (struct rpc_xprt *) sk->sk_user_data;
 281 }
 282
 283 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
 284 {
 285         return (struct sockaddr *) &xprt->addr;
 286 }
 287
 288 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
 289 {
 290         return (struct sockaddr_un *) &xprt->addr;
 291 }
 292
 293 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
 294 {
 295         return (struct sockaddr_in *) &xprt->addr;
 296 }
 297
 298 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
 299 {
 300         return (struct sockaddr_in6 *) &xprt->addr;
 301 }
 302
 303 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
 304 {
 305         struct sockaddr *sap = xs_addr(xprt);
 306         struct sockaddr_in6 *sin6;
 307         struct sockaddr_in *sin;
 308         struct sockaddr_un *sun;
 309         char buf[128];
 310
 311         switch (sap->sa_family) {
 312         case AF_LOCAL:
 313                 sun = xs_addr_un(xprt);
 314                 strlcpy(buf, sun->sun_path, sizeof(buf));
 315                 xprt->address_strings[RPC_DISPLAY_ADDR] =
 316                                                 kstrdup(buf, GFP_KERNEL);
 317                 break;
 318         case AF_INET:
 319                 (void)rpc_ntop(sap, buf, sizeof(buf));
 320                 xprt->address_strings[RPC_DISPLAY_ADDR] =
 321                                                 kstrdup(buf, GFP_KERNEL);
 322                 sin = xs_addr_in(xprt);
 323                 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
 324                 break;
 325         case AF_INET6:
 326                 (void)rpc_ntop(sap, buf, sizeof(buf));
 327                 xprt->address_strings[RPC_DISPLAY_ADDR] =
 328                                                 kstrdup(buf, GFP_KERNEL);
 329                 sin6 = xs_addr_in6(xprt);
 330                 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
 331                 break;
 332         default:
 333                 BUG();
 334         }
 335
 336         xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
 337 }
 338
 339 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
 340 {
 341         struct sockaddr *sap = xs_addr(xprt);
 342         char buf[128];
 343
 344         snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
 345         xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
 346
 347         snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
 348         xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
 349 }
 350
 351 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
 352                                      const char *protocol,
 353                                      const char *netid)
 354 {
 355         xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
 356         xprt->address_strings[RPC_DISPLAY_NETID] = netid;
 357         xs_format_common_peer_addresses(xprt);
 358         xs_format_common_peer_ports(xprt);
 359 }
 360
 361 static void xs_update_peer_port(struct rpc_xprt *xprt)
 362 {
 363         kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
 364         kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
 365
 366         xs_format_common_peer_ports(xprt);
 367 }
 368
 369 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
 370 {
 371         unsigned int i;
 372
 373         for (i = 0; i < RPC_DISPLAY_MAX; i++)
 374                 switch (i) {
 375                 case RPC_DISPLAY_PROTO:
 376                 case RPC_DISPLAY_NETID:
 377                         continue;
 378                 default:
 379                         kfree(xprt->address_strings[i]);
 380                 }
 381 }
 382
 383 #define XS_SENDMSG_FLAGS        (MSG_DONTWAIT | MSG_NOSIGNAL)
 384
 385 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
 386 {
 387         struct msghdr msg = {
 388                 .msg_name       = addr,
 389                 .msg_namelen    = addrlen,
 390                 .msg_flags      = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
 391         };
 392         struct kvec iov = {
 393                 .iov_base       = vec->iov_base + base,
 394                 .iov_len        = vec->iov_len - base,
 395         };
 396
 397         if (iov.iov_len != 0)
 398                 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
 399         return kernel_sendmsg(sock, &msg, NULL, 0, 0);
 400 }
 401
 402 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy)
 403 {
 404         ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
 405                         int offset, size_t size, int flags);
 406         struct page **ppage;
 407         unsigned int remainder;
 408         int err, sent = 0;
 409
 410         remainder = xdr->page_len - base;
 411         base += xdr->page_base;
 412         ppage = xdr->pages + (base >> PAGE_SHIFT);
 413         base &= ~PAGE_MASK;
 414         do_sendpage = sock->ops->sendpage;
 415         if (!zerocopy)
 416                 do_sendpage = sock_no_sendpage;
 417         for(;;) {
 418                 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
 419                 int flags = XS_SENDMSG_FLAGS;
 420
 421                 remainder -= len;
 422                 if (remainder != 0 || more)
 423                         flags |= MSG_MORE;
 424                 err = do_sendpage(sock, *ppage, base, len, flags);
 425                 if (remainder == 0 || err != len)
 426                         break;
 427                 sent += err;
 428                 ppage++;
 429                 base = 0;
 430         }
 431         if (sent == 0)
 432                 return err;
 433         if (err > 0)
 434                 sent += err;
 435         return sent;
 436 }
 437
 438 /**
 439  * xs_sendpages - write pages directly to a socket
 440  * @sock: socket to send on
 441  * @addr: UDP only -- address of destination
 442  * @addrlen: UDP only -- length of destination address
 443  * @xdr: buffer containing this request
 444  * @base: starting position in the buffer
 445  * @zerocopy: true if it is safe to use sendpage()
 446  *
 447  */
 448 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy)
 449 {
 450         unsigned int remainder = xdr->len - base;
 451         int err, sent = 0;
 452
 453         if (unlikely(!sock))
 454                 return -ENOTSOCK;
 455
 456         clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
 457         if (base != 0) {
 458                 addr = NULL;
 459                 addrlen = 0;
 460         }
 461
 462         if (base < xdr->head[0].iov_len || addr != NULL) {
 463                 unsigned int len = xdr->head[0].iov_len - base;
 464                 remainder -= len;
 465                 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
 466                 if (remainder == 0 || err != len)
 467                         goto out;
 468                 sent += err;
 469                 base = 0;
 470         } else
 471                 base -= xdr->head[0].iov_len;
 472
 473         if (base < xdr->page_len) {
 474                 unsigned int len = xdr->page_len - base;
 475                 remainder -= len;
 476                 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy);
 477                 if (remainder == 0 || err != len)
 478                         goto out;
 479                 sent += err;
 480                 base = 0;
 481         } else
 482                 base -= xdr->page_len;
 483
 484         if (base >= xdr->tail[0].iov_len)
 485                 return sent;
 486         err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
 487 out:
 488         if (sent == 0)
 489                 return err;
 490         if (err > 0)
 491                 sent += err;
 492         return sent;
 493 }
 494
 495 static void xs_nospace_callback(struct rpc_task *task)
 496 {
 497         struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
 498
 499         transport->inet->sk_write_pending--;
 500         clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
 501 }
 502
 503 /**
 504  * xs_nospace - place task on wait queue if transmit was incomplete
 505  * @task: task to put to sleep
 506  *
 507  */
 508 static int xs_nospace(struct rpc_task *task)
 509 {
 510         struct rpc_rqst *req = task->tk_rqstp;
 511         struct rpc_xprt *xprt = req->rq_xprt;
 512         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 513         struct sock *sk = transport->inet;
 514         int ret = -EAGAIN;
 515
 516         dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
 517                         task->tk_pid, req->rq_slen - req->rq_bytes_sent,
 518                         req->rq_slen);
 519
 520         /* Protect against races with write_space */
 521         spin_lock_bh(&xprt->transport_lock);
 522
 523         /* Don't race with disconnect */
 524         if (xprt_connected(xprt)) {
 525                 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
 526                         /*
 527                          * Notify TCP that we're limited by the application
 528                          * window size
 529                          */
 530                         set_bit(SOCK_NOSPACE, &transport->sock->flags);
 531                         sk->sk_write_pending++;
 532                         /* ...and wait for more buffer space */
 533                         xprt_wait_for_buffer_space(task, xs_nospace_callback);
 534                 }
 535         } else {
 536                 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
 537                 ret = -ENOTCONN;
 538         }
 539
 540         spin_unlock_bh(&xprt->transport_lock);
 541
 542         /* Race breaker in case memory is freed before above code is called */
 543         sk->sk_write_space(sk);
 544         return ret;
 545 }
 546
 547 /*
 548  * Construct a stream transport record marker in @buf.
 549  */
 550 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
 551 {
 552         u32 reclen = buf->len - sizeof(rpc_fraghdr);
 553         rpc_fraghdr *base = buf->head[0].iov_base;
 554         *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
 555 }
 556
 557 /**
 558  * xs_local_send_request - write an RPC request to an AF_LOCAL socket
 559  * @task: RPC task that manages the state of an RPC request
 560  *
 561  * Return values:
 562  *        0:    The request has been sent
 563  *   EAGAIN:    The socket was blocked, please call again later to
 564  *              complete the request
 565  * ENOTCONN:    Caller needs to invoke connect logic then call again
 566  *    other:    Some other error occured, the request was not sent
 567  */
 568 static int xs_local_send_request(struct rpc_task *task)
 569 {
 570         struct rpc_rqst *req = task->tk_rqstp;
 571         struct rpc_xprt *xprt = req->rq_xprt;
 572         struct sock_xprt *transport =
 573                                 container_of(xprt, struct sock_xprt, xprt);
 574         struct xdr_buf *xdr = &req->rq_snd_buf;
 575         int status;
 576
 577         xs_encode_stream_record_marker(&req->rq_snd_buf);
 578
 579         xs_pktdump("packet data:",
 580                         req->rq_svec->iov_base, req->rq_svec->iov_len);
 581
 582         status = xs_sendpages(transport->sock, NULL, 0,
 583                                                 xdr, req->rq_bytes_sent, true);
 584         dprintk("RPC:       %s(%u) = %d\n",
 585                         __func__, xdr->len - req->rq_bytes_sent, status);
 586         if (likely(status >= 0)) {
 587                 req->rq_bytes_sent += status;
 588                 req->rq_xmit_bytes_sent += status;
 589                 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
 590                         req->rq_bytes_sent = 0;
 591                         return 0;
 592                 }
 593                 status = -EAGAIN;
 594         }
 595
 596         switch (status) {
 597         case -EAGAIN:
 598                 status = xs_nospace(task);
 599                 break;
 600         default:
 601                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
 602                         -status);
 603         case -EPIPE:
 604                 xs_close(xprt);
 605                 status = -ENOTCONN;
 606         }
 607
 608         return status;
 609 }
 610
 611 /**
 612  * xs_udp_send_request - write an RPC request to a UDP socket
 613  * @task: address of RPC task that manages the state of an RPC request
 614  *
 615  * Return values:
 616  *        0:    The request has been sent
 617  *   EAGAIN:    The socket was blocked, please call again later to
 618  *              complete the request
 619  * ENOTCONN:    Caller needs to invoke connect logic then call again
 620  *    other:    Some other error occurred, the request was not sent
 621  */
 622 static int xs_udp_send_request(struct rpc_task *task)
 623 {
 624         struct rpc_rqst *req = task->tk_rqstp;
 625         struct rpc_xprt *xprt = req->rq_xprt;
 626         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 627         struct xdr_buf *xdr = &req->rq_snd_buf;
 628         int status;
 629
 630         xs_pktdump("packet data:",
 631                                 req->rq_svec->iov_base,
 632                                 req->rq_svec->iov_len);
 633
 634         if (!xprt_bound(xprt))
 635                 return -ENOTCONN;
 636         status = xs_sendpages(transport->sock,
 637                               xs_addr(xprt),
 638                               xprt->addrlen, xdr,
 639                               req->rq_bytes_sent, true);
 640
 641         dprintk("RPC:       xs_udp_send_request(%u) = %d\n",
 642                         xdr->len - req->rq_bytes_sent, status);
 643
 644         if (status >= 0) {
 645                 req->rq_xmit_bytes_sent += status;
 646                 if (status >= req->rq_slen)
 647                         return 0;
 648                 /* Still some bytes left; set up for a retry later. */
 649                 status = -EAGAIN;
 650         }
 651
 652         switch (status) {
 653         case -ENOTSOCK:
 654                 status = -ENOTCONN;
 655                 /* Should we call xs_close() here? */
 656                 break;
 657         case -EAGAIN:
 658                 status = xs_nospace(task);
 659                 break;
 660         default:
 661                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
 662                         -status);
 663         case -ENETUNREACH:
 664         case -EPIPE:
 665         case -ECONNREFUSED:
 666                 /* When the server has died, an ICMP port unreachable message
 667                  * prompts ECONNREFUSED. */
 668                 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
 669         }
 670
 671         return status;
 672 }
 673
 674 /**
 675  * xs_tcp_shutdown - gracefully shut down a TCP socket
 676  * @xprt: transport
 677  *
 678  * Initiates a graceful shutdown of the TCP socket by calling the
 679  * equivalent of shutdown(SHUT_WR);
 680  */
 681 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
 682 {
 683         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 684         struct socket *sock = transport->sock;
 685
 686         if (sock != NULL) {
 687                 kernel_sock_shutdown(sock, SHUT_WR);
 688                 trace_rpc_socket_shutdown(xprt, sock);
 689         }
 690 }
 691
 692 /**
 693  * xs_tcp_send_request - write an RPC request to a TCP socket
 694  * @task: address of RPC task that manages the state of an RPC request
 695  *
 696  * Return values:
 697  *        0:    The request has been sent
 698  *   EAGAIN:    The socket was blocked, please call again later to
 699  *              complete the request
 700  * ENOTCONN:    Caller needs to invoke connect logic then call again
 701  *    other:    Some other error occurred, the request was not sent
 702  *
 703  * XXX: In the case of soft timeouts, should we eventually give up
 704  *      if sendmsg is not able to make progress?
 705  */
 706 static int xs_tcp_send_request(struct rpc_task *task)
 707 {
 708         struct rpc_rqst *req = task->tk_rqstp;
 709         struct rpc_xprt *xprt = req->rq_xprt;
 710         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 711         struct xdr_buf *xdr = &req->rq_snd_buf;
 712         bool zerocopy = true;
 713         int status;
 714
 715         xs_encode_stream_record_marker(&req->rq_snd_buf);
 716
 717         xs_pktdump("packet data:",
 718                                 req->rq_svec->iov_base,
 719                                 req->rq_svec->iov_len);
 720         /* Don't use zero copy if this is a resend. If the RPC call
 721          * completes while the socket holds a reference to the pages,
 722          * then we may end up resending corrupted data.
 723          */
 724         if (task->tk_flags & RPC_TASK_SENT)
 725                 zerocopy = false;
 726
 727         /* Continue transmitting the packet/record. We must be careful
 728          * to cope with writespace callbacks arriving _after_ we have
 729          * called sendmsg(). */
 730         while (1) {
 731                 status = xs_sendpages(transport->sock,
 732                                         NULL, 0, xdr, req->rq_bytes_sent,
 733                                         zerocopy);
 734
 735                 dprintk("RPC:       xs_tcp_send_request(%u) = %d\n",
 736                                 xdr->len - req->rq_bytes_sent, status);
 737
 738                 if (unlikely(status < 0))
 739                         break;
 740
 741                 /* If we've sent the entire packet, immediately
 742                  * reset the count of bytes sent. */
 743                 req->rq_bytes_sent += status;
 744                 req->rq_xmit_bytes_sent += status;
 745                 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
 746                         req->rq_bytes_sent = 0;
 747                         return 0;
 748                 }
 749
 750                 if (status != 0)
 751                         continue;
 752                 status = -EAGAIN;
 753                 break;
 754         }
 755
 756         switch (status) {
 757         case -ENOTSOCK:
 758                 status = -ENOTCONN;
 759                 /* Should we call xs_close() here? */
 760                 break;
 761         case -EAGAIN:
 762                 status = xs_nospace(task);
 763                 break;
 764         default:
 765                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
 766                         -status);
 767         case -ECONNRESET:
 768                 xs_tcp_shutdown(xprt);
 769         case -ECONNREFUSED:
 770         case -ENOTCONN:
 771         case -EPIPE:
 772                 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
 773         }
 774
 775         return status;
 776 }
 777
 778 /**
 779  * xs_tcp_release_xprt - clean up after a tcp transmission
 780  * @xprt: transport
 781  * @task: rpc task
 782  *
 783  * This cleans up if an error causes us to abort the transmission of a request.
 784  * In this case, the socket may need to be reset in order to avoid confusing
 785  * the server.
 786  */
 787 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
 788 {
 789         struct rpc_rqst *req;
 790
 791         if (task != xprt->snd_task)
 792                 return;
 793         if (task == NULL)
 794                 goto out_release;
 795         req = task->tk_rqstp;
 796         if (req == NULL)
 797                 goto out_release;
 798         if (req->rq_bytes_sent == 0)
 799                 goto out_release;
 800         if (req->rq_bytes_sent == req->rq_snd_buf.len)
 801                 goto out_release;
 802         set_bit(XPRT_CLOSE_WAIT, &xprt->state);
 803 out_release:
 804         xprt_release_xprt(xprt, task);
 805 }
 806
 807 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
 808 {
 809         transport->old_data_ready = sk->sk_data_ready;
 810         transport->old_state_change = sk->sk_state_change;
 811         transport->old_write_space = sk->sk_write_space;
 812         transport->old_error_report = sk->sk_error_report;
 813 }
 814
 815 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
 816 {
 817         sk->sk_data_ready = transport->old_data_ready;
 818         sk->sk_state_change = transport->old_state_change;
 819         sk->sk_write_space = transport->old_write_space;
 820         sk->sk_error_report = transport->old_error_report;
 821 }
 822
 823 /**
 824  * xs_error_report - callback to handle TCP socket state errors
 825  * @sk: socket
 826  *
 827  * Note: we don't call sock_error() since there may be a rpc_task
 828  * using the socket, and so we don't want to clear sk->sk_err.
 829  */
 830 static void xs_error_report(struct sock *sk)
 831 {
 832         struct rpc_xprt *xprt;
 833         int err;
 834
 835         read_lock_bh(&sk->sk_callback_lock);
 836         if (!(xprt = xprt_from_sock(sk)))
 837                 goto out;
 838
 839         err = -sk->sk_err;
 840         if (err == 0)
 841                 goto out;
 842         dprintk("RPC:       xs_error_report client %p, error=%d...\n",
 843                         xprt, -err);
 844         trace_rpc_socket_error(xprt, sk->sk_socket, err);
 845         if (test_bit(XPRT_CONNECTION_REUSE, &xprt->state))
 846                 goto out;
 847         xprt_wake_pending_tasks(xprt, err);
 848  out:
 849         read_unlock_bh(&sk->sk_callback_lock);
 850 }
 851
 852 static void xs_reset_transport(struct sock_xprt *transport)
 853 {
 854         struct socket *sock = transport->sock;
 855         struct sock *sk = transport->inet;
 856
 857         if (sk == NULL)
 858                 return;
 859
 860         transport->srcport = 0;
 861
 862         write_lock_bh(&sk->sk_callback_lock);
 863         transport->inet = NULL;
 864         transport->sock = NULL;
 865
 866         sk->sk_user_data = NULL;
 867
 868         xs_restore_old_callbacks(transport, sk);
 869         write_unlock_bh(&sk->sk_callback_lock);
 870
 871         sk->sk_no_check = 0;
 872
 873         trace_rpc_socket_close(&transport->xprt, sock);
 874         sock_release(sock);
 875 }
 876
 877 /**
 878  * xs_close - close a socket
 879  * @xprt: transport
 880  *
 881  * This is used when all requests are complete; ie, no DRC state remains
 882  * on the server we want to save.
 883  *
 884  * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
 885  * xs_reset_transport() zeroing the socket from underneath a writer.
 886  */
 887 static void xs_close(struct rpc_xprt *xprt)
 888 {
 889         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
 890
 891         dprintk("RPC:       xs_close xprt %p\n", xprt);
 892
 893         cancel_delayed_work_sync(&transport->connect_worker);
 894
 895         xs_reset_transport(transport);
 896         xprt->reestablish_timeout = 0;
 897
 898         smp_mb__before_clear_bit();
 899         clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
 900         clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
 901         clear_bit(XPRT_CLOSING, &xprt->state);
 902         smp_mb__after_clear_bit();
 903         xprt_disconnect_done(xprt);
 904 }
 905
 906 static void xs_tcp_close(struct rpc_xprt *xprt)
 907 {
 908         if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
 909                 xs_close(xprt);
 910         else
 911                 xs_tcp_shutdown(xprt);
 912 }
 913
 914 /**
 915  * xs_destroy - prepare to shutdown a transport
 916  * @xprt: doomed transport
 917  *
 918  */
 919 static void xs_destroy(struct rpc_xprt *xprt)
 920 {
 921         dprintk("RPC:       xs_destroy xprt %p\n", xprt);
 922
 923         xs_close(xprt);
 924         xs_free_peer_addresses(xprt);
 925         xprt_free(xprt);
 926         module_put(THIS_MODULE);
 927 }
 928
 929 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
 930 {
 931         struct xdr_skb_reader desc = {
 932                 .skb            = skb,
 933                 .offset         = sizeof(rpc_fraghdr),
 934                 .count          = skb->len - sizeof(rpc_fraghdr),
 935         };
 936
 937         if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
 938                 return -1;
 939         if (desc.count)
 940                 return -1;
 941         return 0;
 942 }
 943
 944 /**
 945  * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
 946  * @sk: socket with data to read
 947  * @len: how much data to read
 948  *
 949  * Currently this assumes we can read the whole reply in a single gulp.
 950  */
 951 static void xs_local_data_ready(struct sock *sk, int len)
 952 {
 953         struct rpc_task *task;
 954         struct rpc_xprt *xprt;
 955         struct rpc_rqst *rovr;
 956         struct sk_buff *skb;
 957         int err, repsize, copied;
 958         u32 _xid;
 959         __be32 *xp;
 960
 961         read_lock_bh(&sk->sk_callback_lock);
 962         dprintk("RPC:       %s...\n", __func__);
 963         xprt = xprt_from_sock(sk);
 964         if (xprt == NULL)
 965                 goto out;
 966
 967         skb = skb_recv_datagram(sk, 0, 1, &err);
 968         if (skb == NULL)
 969                 goto out;
 970
 971         repsize = skb->len - sizeof(rpc_fraghdr);
 972         if (repsize < 4) {
 973                 dprintk("RPC:       impossible RPC reply size %d\n", repsize);
 974                 goto dropit;
 975         }
 976
 977         /* Copy the XID from the skb... */
 978         xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
 979         if (xp == NULL)
 980                 goto dropit;
 981
 982         /* Look up and lock the request corresponding to the given XID */
 983         spin_lock(&xprt->transport_lock);
 984         rovr = xprt_lookup_rqst(xprt, *xp);
 985         if (!rovr)
 986                 goto out_unlock;
 987         task = rovr->rq_task;
 988
 989         copied = rovr->rq_private_buf.buflen;
 990         if (copied > repsize)
 991                 copied = repsize;
 992
 993         if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
 994                 dprintk("RPC:       sk_buff copy failed\n");
 995                 goto out_unlock;
 996         }
 997
 998         xprt_complete_rqst(task, copied);
 999
1000  out_unlock:
1001         spin_unlock(&xprt->transport_lock);
1002  dropit:
1003         skb_free_datagram(sk, skb);
1004  out:
1005         read_unlock_bh(&sk->sk_callback_lock);
1006 }
1007
1008 /**
1009  * xs_udp_data_ready - "data ready" callback for UDP sockets
1010  * @sk: socket with data to read
1011  * @len: how much data to read
1012  *
1013  */
1014 static void xs_udp_data_ready(struct sock *sk, int len)
1015 {
1016         struct rpc_task *task;
1017         struct rpc_xprt *xprt;
1018         struct rpc_rqst *rovr;
1019         struct sk_buff *skb;
1020         int err, repsize, copied;
1021         u32 _xid;
1022         __be32 *xp;
1023
1024         read_lock_bh(&sk->sk_callback_lock);
1025         dprintk("RPC:       xs_udp_data_ready...\n");
1026         if (!(xprt = xprt_from_sock(sk)))
1027                 goto out;
1028
1029         if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
1030                 goto out;
1031
1032         repsize = skb->len - sizeof(struct udphdr);
1033         if (repsize < 4) {
1034                 dprintk("RPC:       impossible RPC reply size %d!\n", repsize);
1035                 goto dropit;
1036         }
1037
1038         /* Copy the XID from the skb... */
1039         xp = skb_header_pointer(skb, sizeof(struct udphdr),
1040                                 sizeof(_xid), &_xid);
1041         if (xp == NULL)
1042                 goto dropit;
1043
1044         /* Look up and lock the request corresponding to the given XID */
1045         spin_lock(&xprt->transport_lock);
1046         rovr = xprt_lookup_rqst(xprt, *xp);
1047         if (!rovr)
1048                 goto out_unlock;
1049         task = rovr->rq_task;
1050
1051         if ((copied = rovr->rq_private_buf.buflen) > repsize)
1052                 copied = repsize;
1053
1054         /* Suck it into the iovec, verify checksum if not done by hw. */
1055         if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1056                 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
1057                 goto out_unlock;
1058         }
1059
1060         UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
1061
1062         xprt_adjust_cwnd(xprt, task, copied);
1063         xprt_complete_rqst(task, copied);
1064
1065  out_unlock:
1066         spin_unlock(&xprt->transport_lock);
1067  dropit:
1068         skb_free_datagram(sk, skb);
1069  out:
1070         read_unlock_bh(&sk->sk_callback_lock);
1071 }
1072
1073 /*
1074  * Helper function to force a TCP close if the server is sending
1075  * junk and/or it has put us in CLOSE_WAIT
1076  */
1077 static void xs_tcp_force_close(struct rpc_xprt *xprt)
1078 {
1079         set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1080         xprt_force_disconnect(xprt);
1081 }
1082
1083 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1084 {
1085         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1086         size_t len, used;
1087         char *p;
1088
1089         p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1090         len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1091         used = xdr_skb_read_bits(desc, p, len);
1092         transport->tcp_offset += used;
1093         if (used != len)
1094                 return;
1095
1096         transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1097         if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1098                 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1099         else
1100                 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1101         transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1102
1103         transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1104         transport->tcp_offset = 0;
1105
1106         /* Sanity check of the record length */
1107         if (unlikely(transport->tcp_reclen < 8)) {
1108                 dprintk("RPC:       invalid TCP record fragment length\n");
1109                 xs_tcp_force_close(xprt);
1110                 return;
1111         }
1112         dprintk("RPC:       reading TCP record fragment of length %d\n",
1113                         transport->tcp_reclen);
1114 }
1115
1116 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1117 {
1118         if (transport->tcp_offset == transport->tcp_reclen) {
1119                 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1120                 transport->tcp_offset = 0;
1121                 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1122                         transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1123                         transport->tcp_flags |= TCP_RCV_COPY_XID;
1124                         transport->tcp_copied = 0;
1125                 }
1126         }
1127 }
1128
1129 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1130 {
1131         size_t len, used;
1132         char *p;
1133
1134         len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1135         dprintk("RPC:       reading XID (%Zu bytes)\n", len);
1136         p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1137         used = xdr_skb_read_bits(desc, p, len);
1138         transport->tcp_offset += used;
1139         if (used != len)
1140                 return;
1141         transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1142         transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1143         transport->tcp_copied = 4;
1144         dprintk("RPC:       reading %s XID %08x\n",
1145                         (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1146                                                               : "request with",
1147                         ntohl(transport->tcp_xid));
1148         xs_tcp_check_fraghdr(transport);
1149 }
1150
1151 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1152                                        struct xdr_skb_reader *desc)
1153 {
1154         size_t len, used;
1155         u32 offset;
1156         char *p;
1157
1158         /*
1159          * We want transport->tcp_offset to be 8 at the end of this routine
1160          * (4 bytes for the xid and 4 bytes for the call/reply flag).
1161          * When this function is called for the first time,
1162          * transport->tcp_offset is 4 (after having already read the xid).
1163          */
1164         offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1165         len = sizeof(transport->tcp_calldir) - offset;
1166         dprintk("RPC:       reading CALL/REPLY flag (%Zu bytes)\n", len);
1167         p = ((char *) &transport->tcp_calldir) + offset;
1168         used = xdr_skb_read_bits(desc, p, len);
1169         transport->tcp_offset += used;
1170         if (used != len)
1171                 return;
1172         transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1173         /*
1174          * We don't yet have the XDR buffer, so we will write the calldir
1175          * out after we get the buffer from the 'struct rpc_rqst'
1176          */
1177         switch (ntohl(transport->tcp_calldir)) {
1178         case RPC_REPLY:
1179                 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1180                 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1181                 transport->tcp_flags |= TCP_RPC_REPLY;
1182                 break;
1183         case RPC_CALL:
1184                 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1185                 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1186                 transport->tcp_flags &= ~TCP_RPC_REPLY;
1187                 break;
1188         default:
1189                 dprintk("RPC:       invalid request message type\n");
1190                 xs_tcp_force_close(&transport->xprt);
1191         }
1192         xs_tcp_check_fraghdr(transport);
1193 }
1194
1195 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1196                                      struct xdr_skb_reader *desc,
1197                                      struct rpc_rqst *req)
1198 {
1199         struct sock_xprt *transport =
1200                                 container_of(xprt, struct sock_xprt, xprt);
1201         struct xdr_buf *rcvbuf;
1202         size_t len;
1203         ssize_t r;
1204
1205         rcvbuf = &req->rq_private_buf;
1206
1207         if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1208                 /*
1209                  * Save the RPC direction in the XDR buffer
1210                  */
1211                 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1212                         &transport->tcp_calldir,
1213                         sizeof(transport->tcp_calldir));
1214                 transport->tcp_copied += sizeof(transport->tcp_calldir);
1215                 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1216         }
1217
1218         len = desc->count;
1219         if (len > transport->tcp_reclen - transport->tcp_offset) {
1220                 struct xdr_skb_reader my_desc;
1221
1222                 len = transport->tcp_reclen - transport->tcp_offset;
1223                 memcpy(&my_desc, desc, sizeof(my_desc));
1224                 my_desc.count = len;
1225                 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1226                                           &my_desc, xdr_skb_read_bits);
1227                 desc->count -= r;
1228                 desc->offset += r;
1229         } else
1230                 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1231                                           desc, xdr_skb_read_bits);
1232
1233         if (r > 0) {
1234                 transport->tcp_copied += r;
1235                 transport->tcp_offset += r;
1236         }
1237         if (r != len) {
1238                 /* Error when copying to the receive buffer,
1239                  * usually because we weren't able to allocate
1240                  * additional buffer pages. All we can do now
1241                  * is turn off TCP_RCV_COPY_DATA, so the request
1242                  * will not receive any additional updates,
1243                  * and time out.
1244                  * Any remaining data from this record will
1245                  * be discarded.
1246                  */
1247                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1248                 dprintk("RPC:       XID %08x truncated request\n",
1249                                 ntohl(transport->tcp_xid));
1250                 dprintk("RPC:       xprt = %p, tcp_copied = %lu, "
1251                                 "tcp_offset = %u, tcp_reclen = %u\n",
1252                                 xprt, transport->tcp_copied,
1253                                 transport->tcp_offset, transport->tcp_reclen);
1254                 return;
1255         }
1256
1257         dprintk("RPC:       XID %08x read %Zd bytes\n",
1258                         ntohl(transport->tcp_xid), r);
1259         dprintk("RPC:       xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1260                         "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1261                         transport->tcp_offset, transport->tcp_reclen);
1262
1263         if (transport->tcp_copied == req->rq_private_buf.buflen)
1264                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1265         else if (transport->tcp_offset == transport->tcp_reclen) {
1266                 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1267                         transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1268         }
1269 }
1270
1271 /*
1272  * Finds the request corresponding to the RPC xid and invokes the common
1273  * tcp read code to read the data.
1274  */
1275 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1276                                     struct xdr_skb_reader *desc)
1277 {
1278         struct sock_xprt *transport =
1279                                 container_of(xprt, struct sock_xprt, xprt);
1280         struct rpc_rqst *req;
1281
1282         dprintk("RPC:       read reply XID %08x\n", ntohl(transport->tcp_xid));
1283
1284         /* Find and lock the request corresponding to this xid */
1285         spin_lock(&xprt->transport_lock);
1286         req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1287         if (!req) {
1288                 dprintk("RPC:       XID %08x request not found!\n",
1289                                 ntohl(transport->tcp_xid));
1290                 spin_unlock(&xprt->transport_lock);
1291                 return -1;
1292         }
1293
1294         xs_tcp_read_common(xprt, desc, req);
1295
1296         if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1297                 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1298
1299         spin_unlock(&xprt->transport_lock);
1300         return 0;
1301 }
1302
1303 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1304 /*
1305  * Obtains an rpc_rqst previously allocated and invokes the common
1306  * tcp read code to read the data.  The result is placed in the callback
1307  * queue.
1308  * If we're unable to obtain the rpc_rqst we schedule the closing of the
1309  * connection and return -1.
1310  */
1311 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1312                                        struct xdr_skb_reader *desc)
1313 {
1314         struct sock_xprt *transport =
1315                                 container_of(xprt, struct sock_xprt, xprt);
1316         struct rpc_rqst *req;
1317
1318         req = xprt_alloc_bc_request(xprt);
1319         if (req == NULL) {
1320                 printk(KERN_WARNING "Callback slot table overflowed\n");
1321                 xprt_force_disconnect(xprt);
1322                 return -1;
1323         }
1324
1325         req->rq_xid = transport->tcp_xid;
1326         dprintk("RPC:       read callback  XID %08x\n", ntohl(req->rq_xid));
1327         xs_tcp_read_common(xprt, desc, req);
1328
1329         if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1330                 struct svc_serv *bc_serv = xprt->bc_serv;
1331
1332                 /*
1333                  * Add callback request to callback list.  The callback
1334                  * service sleeps on the sv_cb_waitq waiting for new
1335                  * requests.  Wake it up after adding enqueing the
1336                  * request.
1337                  */
1338                 dprintk("RPC:       add callback request to list\n");
1339                 spin_lock(&bc_serv->sv_cb_lock);
1340                 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1341                 spin_unlock(&bc_serv->sv_cb_lock);
1342                 wake_up(&bc_serv->sv_cb_waitq);
1343         }
1344
1345         req->rq_private_buf.len = transport->tcp_copied;
1346
1347         return 0;
1348 }
1349
1350 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1351                                         struct xdr_skb_reader *desc)
1352 {
1353         struct sock_xprt *transport =
1354                                 container_of(xprt, struct sock_xprt, xprt);
1355
1356         return (transport->tcp_flags & TCP_RPC_REPLY) ?
1357                 xs_tcp_read_reply(xprt, desc) :
1358                 xs_tcp_read_callback(xprt, desc);
1359 }
1360 #else
1361 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1362                                         struct xdr_skb_reader *desc)
1363 {
1364         return xs_tcp_read_reply(xprt, desc);
1365 }
1366 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1367
1368 /*
1369  * Read data off the transport.  This can be either an RPC_CALL or an
1370  * RPC_REPLY.  Relay the processing to helper functions.
1371  */
1372 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1373                                     struct xdr_skb_reader *desc)
1374 {
1375         struct sock_xprt *transport =
1376                                 container_of(xprt, struct sock_xprt, xprt);
1377
1378         if (_xs_tcp_read_data(xprt, desc) == 0)
1379                 xs_tcp_check_fraghdr(transport);
1380         else {
1381                 /*
1382                  * The transport_lock protects the request handling.
1383                  * There's no need to hold it to update the tcp_flags.
1384                  */
1385                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1386         }
1387 }
1388
1389 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1390 {
1391         size_t len;
1392
1393         len = transport->tcp_reclen - transport->tcp_offset;
1394         if (len > desc->count)
1395                 len = desc->count;
1396         desc->count -= len;
1397         desc->offset += len;
1398         transport->tcp_offset += len;
1399         dprintk("RPC:       discarded %Zu bytes\n", len);
1400         xs_tcp_check_fraghdr(transport);
1401 }
1402
1403 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1404 {
1405         struct rpc_xprt *xprt = rd_desc->arg.data;
1406         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1407         struct xdr_skb_reader desc = {
1408                 .skb    = skb,
1409                 .offset = offset,
1410                 .count  = len,
1411         };
1412
1413         dprintk("RPC:       xs_tcp_data_recv started\n");
1414         do {
1415                 /* Read in a new fragment marker if necessary */
1416                 /* Can we ever really expect to get completely empty fragments? */
1417                 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1418                         xs_tcp_read_fraghdr(xprt, &desc);
1419                         continue;
1420                 }
1421                 /* Read in the xid if necessary */
1422                 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1423                         xs_tcp_read_xid(transport, &desc);
1424                         continue;
1425                 }
1426                 /* Read in the call/reply flag */
1427                 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1428                         xs_tcp_read_calldir(transport, &desc);
1429                         continue;
1430                 }
1431                 /* Read in the request data */
1432                 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1433                         xs_tcp_read_data(xprt, &desc);
1434                         continue;
1435                 }
1436                 /* Skip over any trailing bytes on short reads */
1437                 xs_tcp_read_discard(transport, &desc);
1438         } while (desc.count);
1439         dprintk("RPC:       xs_tcp_data_recv done\n");
1440         return len - desc.count;
1441 }
1442
1443 /**
1444  * xs_tcp_data_ready - "data ready" callback for TCP sockets
1445  * @sk: socket with data to read
1446  * @bytes: how much data to read
1447  *
1448  */
1449 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1450 {
1451         struct rpc_xprt *xprt;
1452         read_descriptor_t rd_desc;
1453         int read;
1454
1455         dprintk("RPC:       xs_tcp_data_ready...\n");
1456
1457         read_lock_bh(&sk->sk_callback_lock);
1458         if (!(xprt = xprt_from_sock(sk)))
1459                 goto out;
1460         /* Any data means we had a useful conversation, so
1461          * the we don't need to delay the next reconnect
1462          */
1463         if (xprt->reestablish_timeout)
1464                 xprt->reestablish_timeout = 0;
1465
1466         /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1467         rd_desc.arg.data = xprt;
1468         do {
1469                 rd_desc.count = 65536;
1470                 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1471         } while (read > 0);
1472 out:
1473         read_unlock_bh(&sk->sk_callback_lock);
1474 }
1475
1476 /*
1477  * Do the equivalent of linger/linger2 handling for dealing with
1478  * broken servers that don't close the socket in a timely
1479  * fashion
1480  */
1481 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1482                 unsigned long timeout)
1483 {
1484         struct sock_xprt *transport;
1485
1486         if (xprt_test_and_set_connecting(xprt))
1487                 return;
1488         set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1489         transport = container_of(xprt, struct sock_xprt, xprt);
1490         queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1491                            timeout);
1492 }
1493
1494 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1495 {
1496         struct sock_xprt *transport;
1497
1498         transport = container_of(xprt, struct sock_xprt, xprt);
1499
1500         if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1501             !cancel_delayed_work(&transport->connect_worker))
1502                 return;
1503         clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1504         xprt_clear_connecting(xprt);
1505 }
1506
1507 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
1508 {
1509         smp_mb__before_clear_bit();
1510         clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1511         clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1512         clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1513         clear_bit(XPRT_CLOSING, &xprt->state);
1514         smp_mb__after_clear_bit();
1515 }
1516
1517 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1518 {
1519         xs_sock_reset_connection_flags(xprt);
1520         /* Mark transport as closed and wake up all pending tasks */
1521         xprt_disconnect_done(xprt);
1522 }
1523
1524 /**
1525  * xs_tcp_state_change - callback to handle TCP socket state changes
1526  * @sk: socket whose state has changed
1527  *
1528  */
1529 static void xs_tcp_state_change(struct sock *sk)
1530 {
1531         struct rpc_xprt *xprt;
1532
1533         read_lock_bh(&sk->sk_callback_lock);
1534         if (!(xprt = xprt_from_sock(sk)))
1535                 goto out;
1536         dprintk("RPC:       xs_tcp_state_change client %p...\n", xprt);
1537         dprintk("RPC:       state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1538                         sk->sk_state, xprt_connected(xprt),
1539                         sock_flag(sk, SOCK_DEAD),
1540                         sock_flag(sk, SOCK_ZAPPED),
1541                         sk->sk_shutdown);
1542
1543         trace_rpc_socket_state_change(xprt, sk->sk_socket);
1544         switch (sk->sk_state) {
1545         case TCP_ESTABLISHED:
1546                 spin_lock(&xprt->transport_lock);
1547                 if (!xprt_test_and_set_connected(xprt)) {
1548                         struct sock_xprt *transport = container_of(xprt,
1549                                         struct sock_xprt, xprt);
1550
1551                         /* Reset TCP record info */
1552                         transport->tcp_offset = 0;
1553                         transport->tcp_reclen = 0;
1554                         transport->tcp_copied = 0;
1555                         transport->tcp_flags =
1556                                 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1557                         xprt->connect_cookie++;
1558
1559                         xprt_wake_pending_tasks(xprt, -EAGAIN);
1560                 }
1561                 spin_unlock(&xprt->transport_lock);
1562                 break;
1563         case TCP_FIN_WAIT1:
1564                 /* The client initiated a shutdown of the socket */
1565                 xprt->connect_cookie++;
1566                 xprt->reestablish_timeout = 0;
1567                 set_bit(XPRT_CLOSING, &xprt->state);
1568                 smp_mb__before_clear_bit();
1569                 clear_bit(XPRT_CONNECTED, &xprt->state);
1570                 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1571                 smp_mb__after_clear_bit();
1572                 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1573                 break;
1574         case TCP_CLOSE_WAIT:
1575                 /* The server initiated a shutdown of the socket */
1576                 xprt->connect_cookie++;
1577                 clear_bit(XPRT_CONNECTED, &xprt->state);
1578                 xs_tcp_force_close(xprt);
1579         case TCP_CLOSING:
1580                 /*
1581                  * If the server closed down the connection, make sure that
1582                  * we back off before reconnecting
1583                  */
1584                 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1585                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1586                 break;
1587         case TCP_LAST_ACK:
1588                 set_bit(XPRT_CLOSING, &xprt->state);
1589                 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1590                 smp_mb__before_clear_bit();
1591                 clear_bit(XPRT_CONNECTED, &xprt->state);
1592                 smp_mb__after_clear_bit();
1593                 break;
1594         case TCP_CLOSE:
1595                 xs_tcp_cancel_linger_timeout(xprt);
1596                 xs_sock_mark_closed(xprt);
1597         }
1598  out:
1599         read_unlock_bh(&sk->sk_callback_lock);
1600 }
1601
1602 static void xs_write_space(struct sock *sk)
1603 {
1604         struct socket *sock;
1605         struct rpc_xprt *xprt;
1606
1607         if (unlikely(!(sock = sk->sk_socket)))
1608                 return;
1609         clear_bit(SOCK_NOSPACE, &sock->flags);
1610
1611         if (unlikely(!(xprt = xprt_from_sock(sk))))
1612                 return;
1613         if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1614                 return;
1615
1616         xprt_write_space(xprt);
1617 }
1618
1619 /**
1620  * xs_udp_write_space - callback invoked when socket buffer space
1621  *                             becomes available
1622  * @sk: socket whose state has changed
1623  *
1624  * Called when more output buffer space is available for this socket.
1625  * We try not to wake our writers until they can make "significant"
1626  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1627  * with a bunch of small requests.
1628  */
1629 static void xs_udp_write_space(struct sock *sk)
1630 {
1631         read_lock_bh(&sk->sk_callback_lock);
1632
1633         /* from net/core/sock.c:sock_def_write_space */
1634         if (sock_writeable(sk))
1635                 xs_write_space(sk);
1636
1637         read_unlock_bh(&sk->sk_callback_lock);
1638 }
1639
1640 /**
1641  * xs_tcp_write_space - callback invoked when socket buffer space
1642  *                             becomes available
1643  * @sk: socket whose state has changed
1644  *
1645  * Called when more output buffer space is available for this socket.
1646  * We try not to wake our writers until they can make "significant"
1647  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1648  * with a bunch of small requests.
1649  */
1650 static void xs_tcp_write_space(struct sock *sk)
1651 {
1652         read_lock_bh(&sk->sk_callback_lock);
1653
1654         /* from net/core/stream.c:sk_stream_write_space */
1655         if (sk_stream_is_writeable(sk))
1656                 xs_write_space(sk);
1657
1658         read_unlock_bh(&sk->sk_callback_lock);
1659 }
1660
1661 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1662 {
1663         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1664         struct sock *sk = transport->inet;
1665
1666         if (transport->rcvsize) {
1667                 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1668                 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1669         }
1670         if (transport->sndsize) {
1671                 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1672                 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1673                 sk->sk_write_space(sk);
1674         }
1675 }
1676
1677 /**
1678  * xs_udp_set_buffer_size - set send and receive limits
1679  * @xprt: generic transport
1680  * @sndsize: requested size of send buffer, in bytes
1681  * @rcvsize: requested size of receive buffer, in bytes
1682  *
1683  * Set socket send and receive buffer size limits.
1684  */
1685 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1686 {
1687         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1688
1689         transport->sndsize = 0;
1690         if (sndsize)
1691                 transport->sndsize = sndsize + 1024;
1692         transport->rcvsize = 0;
1693         if (rcvsize)
1694                 transport->rcvsize = rcvsize + 1024;
1695
1696         xs_udp_do_set_buffer_size(xprt);
1697 }
1698
1699 /**
1700  * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1701  * @task: task that timed out
1702  *
1703  * Adjust the congestion window after a retransmit timeout has occurred.
1704  */
1705 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1706 {
1707         xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1708 }
1709
1710 static unsigned short xs_get_random_port(void)
1711 {
1712         unsigned short range = xprt_max_resvport - xprt_min_resvport;
1713         unsigned short rand = (unsigned short) prandom_u32() % range;
1714         return rand + xprt_min_resvport;
1715 }
1716
1717 /**
1718  * xs_set_port - reset the port number in the remote endpoint address
1719  * @xprt: generic transport
1720  * @port: new port number
1721  *
1722  */
1723 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1724 {
1725         dprintk("RPC:       setting port for xprt %p to %u\n", xprt, port);
1726
1727         rpc_set_port(xs_addr(xprt), port);
1728         xs_update_peer_port(xprt);
1729 }
1730
1731 static unsigned short xs_get_srcport(struct sock_xprt *transport)
1732 {
1733         unsigned short port = transport->srcport;
1734
1735         if (port == 0 && transport->xprt.resvport)
1736                 port = xs_get_random_port();
1737         return port;
1738 }
1739
1740 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1741 {
1742         if (transport->srcport != 0)
1743                 transport->srcport = 0;
1744         if (!transport->xprt.resvport)
1745                 return 0;
1746         if (port <= xprt_min_resvport || port > xprt_max_resvport)
1747                 return xprt_max_resvport;
1748         return --port;
1749 }
1750 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1751 {
1752         struct sockaddr_storage myaddr;
1753         int err, nloop = 0;
1754         unsigned short port = xs_get_srcport(transport);
1755         unsigned short last;
1756
1757         memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1758         do {
1759                 rpc_set_port((struct sockaddr *)&myaddr, port);
1760                 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1761                                 transport->xprt.addrlen);
1762                 if (port == 0)
1763                         break;
1764                 if (err == 0) {
1765                         transport->srcport = port;
1766                         break;
1767                 }
1768                 last = port;
1769                 port = xs_next_srcport(transport, port);
1770                 if (port > last)
1771                         nloop++;
1772         } while (err == -EADDRINUSE && nloop != 2);
1773
1774         if (myaddr.ss_family == AF_INET)
1775                 dprintk("RPC:       %s %pI4:%u: %s (%d)\n", __func__,
1776                                 &((struct sockaddr_in *)&myaddr)->sin_addr,
1777                                 port, err ? "failed" : "ok", err);
1778         else
1779                 dprintk("RPC:       %s %pI6:%u: %s (%d)\n", __func__,
1780                                 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1781                                 port, err ? "failed" : "ok", err);
1782         return err;
1783 }
1784
1785 /*
1786  * We don't support autobind on AF_LOCAL sockets
1787  */
1788 static void xs_local_rpcbind(struct rpc_task *task)
1789 {
1790         rcu_read_lock();
1791         xprt_set_bound(rcu_dereference(task->tk_client->cl_xprt));
1792         rcu_read_unlock();
1793 }
1794
1795 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1796 {
1797 }
1798
1799 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1800 static struct lock_class_key xs_key[2];
1801 static struct lock_class_key xs_slock_key[2];
1802
1803 static inline void xs_reclassify_socketu(struct socket *sock)
1804 {
1805         struct sock *sk = sock->sk;
1806
1807         sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1808                 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1809 }
1810
1811 static inline void xs_reclassify_socket4(struct socket *sock)
1812 {
1813         struct sock *sk = sock->sk;
1814
1815         sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1816                 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1817 }
1818
1819 static inline void xs_reclassify_socket6(struct socket *sock)
1820 {
1821         struct sock *sk = sock->sk;
1822
1823         sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1824                 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1825 }
1826
1827 static inline void xs_reclassify_socket(int family, struct socket *sock)
1828 {
1829         WARN_ON_ONCE(sock_owned_by_user(sock->sk));
1830         if (sock_owned_by_user(sock->sk))
1831                 return;
1832
1833         switch (family) {
1834         case AF_LOCAL:
1835                 xs_reclassify_socketu(sock);
1836                 break;
1837         case AF_INET:
1838                 xs_reclassify_socket4(sock);
1839                 break;
1840         case AF_INET6:
1841                 xs_reclassify_socket6(sock);
1842                 break;
1843         }
1844 }
1845 #else
1846 static inline void xs_reclassify_socketu(struct socket *sock)
1847 {
1848 }
1849
1850 static inline void xs_reclassify_socket4(struct socket *sock)
1851 {
1852 }
1853
1854 static inline void xs_reclassify_socket6(struct socket *sock)
1855 {
1856 }
1857
1858 static inline void xs_reclassify_socket(int family, struct socket *sock)
1859 {
1860 }
1861 #endif
1862
1863 static void xs_dummy_setup_socket(struct work_struct *work)
1864 {
1865 }
1866
1867 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1868                 struct sock_xprt *transport, int family, int type, int protocol)
1869 {
1870         struct socket *sock;
1871         int err;
1872
1873         err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1874         if (err < 0) {
1875                 dprintk("RPC:       can't create %d transport socket (%d).\n",
1876                                 protocol, -err);
1877                 goto out;
1878         }
1879         xs_reclassify_socket(family, sock);
1880
1881         err = xs_bind(transport, sock);
1882         if (err) {
1883                 sock_release(sock);
1884                 goto out;
1885         }
1886
1887         return sock;
1888 out:
1889         return ERR_PTR(err);
1890 }
1891
1892 static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1893                                       struct socket *sock)
1894 {
1895         struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1896                                                                         xprt);
1897
1898         if (!transport->inet) {
1899                 struct sock *sk = sock->sk;
1900
1901                 write_lock_bh(&sk->sk_callback_lock);
1902
1903                 xs_save_old_callbacks(transport, sk);
1904
1905                 sk->sk_user_data = xprt;
1906                 sk->sk_data_ready = xs_local_data_ready;
1907                 sk->sk_write_space = xs_udp_write_space;
1908                 sk->sk_error_report = xs_error_report;
1909                 sk->sk_allocation = GFP_ATOMIC;
1910
1911                 xprt_clear_connected(xprt);
1912
1913                 /* Reset to new socket */
1914                 transport->sock = sock;
1915                 transport->inet = sk;
1916
1917                 write_unlock_bh(&sk->sk_callback_lock);
1918         }
1919
1920         /* Tell the socket layer to start connecting... */
1921         xprt->stat.connect_count++;
1922         xprt->stat.connect_start = jiffies;
1923         return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1924 }
1925
1926 /**
1927  * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1928  * @xprt: RPC transport to connect
1929  * @transport: socket transport to connect
1930  * @create_sock: function to create a socket of the correct type
1931  */
1932 static int xs_local_setup_socket(struct sock_xprt *transport)
1933 {
1934         struct rpc_xprt *xprt = &transport->xprt;
1935         struct socket *sock;
1936         int status = -EIO;
1937
1938         current->flags |= PF_FSTRANS;
1939
1940         clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1941         status = __sock_create(xprt->xprt_net, AF_LOCAL,
1942                                         SOCK_STREAM, 0, &sock, 1);
1943         if (status < 0) {
1944                 dprintk("RPC:       can't create AF_LOCAL "
1945                         "transport socket (%d).\n", -status);
1946                 goto out;
1947         }
1948         xs_reclassify_socketu(sock);
1949
1950         dprintk("RPC:       worker connecting xprt %p via AF_LOCAL to %s\n",
1951                         xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1952
1953         status = xs_local_finish_connecting(xprt, sock);
1954         trace_rpc_socket_connect(xprt, sock, status);
1955         switch (status) {
1956         case 0:
1957                 dprintk("RPC:       xprt %p connected to %s\n",
1958                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1959                 xprt_set_connected(xprt);
1960                 break;
1961         case -ENOENT:
1962                 dprintk("RPC:       xprt %p: socket %s does not exist\n",
1963                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1964                 break;
1965         case -ECONNREFUSED:
1966                 dprintk("RPC:       xprt %p: connection refused for %s\n",
1967                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1968                 break;
1969         default:
1970                 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
1971                                 __func__, -status,
1972                                 xprt->address_strings[RPC_DISPLAY_ADDR]);
1973         }
1974
1975 out:
1976         xprt_clear_connecting(xprt);
1977         xprt_wake_pending_tasks(xprt, status);
1978         current->flags &= ~PF_FSTRANS;
1979         return status;
1980 }
1981
1982 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
1983 {
1984         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1985         int ret;
1986
1987          if (RPC_IS_ASYNC(task)) {
1988                 /*
1989                  * We want the AF_LOCAL connect to be resolved in the
1990                  * filesystem namespace of the process making the rpc
1991                  * call.  Thus we connect synchronously.
1992                  *
1993                  * If we want to support asynchronous AF_LOCAL calls,
1994                  * we'll need to figure out how to pass a namespace to
1995                  * connect.
1996                  */
1997                 rpc_exit(task, -ENOTCONN);
1998                 return;
1999         }
2000         ret = xs_local_setup_socket(transport);
2001         if (ret && !RPC_IS_SOFTCONN(task))
2002                 msleep_interruptible(15000);
2003 }
2004
2005 #ifdef CONFIG_SUNRPC_SWAP
2006 static void xs_set_memalloc(struct rpc_xprt *xprt)
2007 {
2008         struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2009                         xprt);
2010
2011         if (xprt->swapper)
2012                 sk_set_memalloc(transport->inet);
2013 }
2014
2015 /**
2016  * xs_swapper - Tag this transport as being used for swap.
2017  * @xprt: transport to tag
2018  * @enable: enable/disable
2019  *
2020  */
2021 int xs_swapper(struct rpc_xprt *xprt, int enable)
2022 {
2023         struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2024                         xprt);
2025         int err = 0;
2026
2027         if (enable) {
2028                 xprt->swapper++;
2029                 xs_set_memalloc(xprt);
2030         } else if (xprt->swapper) {
2031                 xprt->swapper--;
2032                 sk_clear_memalloc(transport->inet);
2033         }
2034
2035         return err;
2036 }
2037 EXPORT_SYMBOL_GPL(xs_swapper);
2038 #else
2039 static void xs_set_memalloc(struct rpc_xprt *xprt)
2040 {
2041 }
2042 #endif
2043
2044 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2045 {
2046         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2047
2048         if (!transport->inet) {
2049                 struct sock *sk = sock->sk;
2050
2051                 write_lock_bh(&sk->sk_callback_lock);
2052
2053                 xs_save_old_callbacks(transport, sk);
2054
2055                 sk->sk_user_data = xprt;
2056                 sk->sk_data_ready = xs_udp_data_ready;
2057                 sk->sk_write_space = xs_udp_write_space;
2058                 sk->sk_no_check = UDP_CSUM_NORCV;
2059                 sk->sk_allocation = GFP_ATOMIC;
2060
2061                 xprt_set_connected(xprt);
2062
2063                 /* Reset to new socket */
2064                 transport->sock = sock;
2065                 transport->inet = sk;
2066
2067                 xs_set_memalloc(xprt);
2068
2069                 write_unlock_bh(&sk->sk_callback_lock);
2070         }
2071         xs_udp_do_set_buffer_size(xprt);
2072 }
2073
2074 static void xs_udp_setup_socket(struct work_struct *work)
2075 {
2076         struct sock_xprt *transport =
2077                 container_of(work, struct sock_xprt, connect_worker.work);
2078         struct rpc_xprt *xprt = &transport->xprt;
2079         struct socket *sock = transport->sock;
2080         int status = -EIO;
2081
2082         current->flags |= PF_FSTRANS;
2083
2084         /* Start by resetting any existing state */
2085         xs_reset_transport(transport);
2086         sock = xs_create_sock(xprt, transport,
2087                         xs_addr(xprt)->sa_family, SOCK_DGRAM, IPPROTO_UDP);
2088         if (IS_ERR(sock))
2089                 goto out;
2090
2091         dprintk("RPC:       worker connecting xprt %p via %s to "
2092                                 "%s (port %s)\n", xprt,
2093                         xprt->address_strings[RPC_DISPLAY_PROTO],
2094                         xprt->address_strings[RPC_DISPLAY_ADDR],
2095                         xprt->address_strings[RPC_DISPLAY_PORT]);
2096
2097         xs_udp_finish_connecting(xprt, sock);
2098         trace_rpc_socket_connect(xprt, sock, 0);
2099         status = 0;
2100 out:
2101         xprt_clear_connecting(xprt);
2102         xprt_wake_pending_tasks(xprt, status);
2103         current->flags &= ~PF_FSTRANS;
2104 }
2105
2106 /*
2107  * We need to preserve the port number so the reply cache on the server can
2108  * find our cached RPC replies when we get around to reconnecting.
2109  */
2110 static void xs_abort_connection(struct sock_xprt *transport)
2111 {
2112         int result;
2113         struct sockaddr any;
2114
2115         dprintk("RPC:       disconnecting xprt %p to reuse port\n", transport);
2116
2117         /*
2118          * Disconnect the transport socket by doing a connect operation
2119          * with AF_UNSPEC.  This should return immediately...
2120          */
2121         memset(&any, 0, sizeof(any));
2122         any.sa_family = AF_UNSPEC;
2123         result = kernel_connect(transport->sock, &any, sizeof(any), 0);
2124         trace_rpc_socket_reset_connection(&transport->xprt,
2125                         transport->sock, result);
2126         if (!result)
2127                 xs_sock_reset_connection_flags(&transport->xprt);
2128         dprintk("RPC:       AF_UNSPEC connect return code %d\n", result);
2129 }
2130
2131 static void xs_tcp_reuse_connection(struct sock_xprt *transport)
2132 {
2133         unsigned int state = transport->inet->sk_state;
2134
2135         if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
2136                 /* we don't need to abort the connection if the socket
2137                  * hasn't undergone a shutdown
2138                  */
2139                 if (transport->inet->sk_shutdown == 0)
2140                         return;
2141                 dprintk("RPC:       %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2142                                 __func__, transport->inet->sk_shutdown);
2143         }
2144         if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
2145                 /* we don't need to abort the connection if the socket
2146                  * hasn't undergone a shutdown
2147                  */
2148                 if (transport->inet->sk_shutdown == 0)
2149                         return;
2150                 dprintk("RPC:       %s: ESTABLISHED/SYN_SENT "
2151                                 "sk_shutdown set to %d\n",
2152                                 __func__, transport->inet->sk_shutdown);
2153         }
2154         xs_abort_connection(transport);
2155 }
2156
2157 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2158 {
2159         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2160         int ret = -ENOTCONN;
2161
2162         if (!transport->inet) {
2163                 struct sock *sk = sock->sk;
2164                 unsigned int keepidle = xprt->timeout->to_initval / HZ;
2165                 unsigned int keepcnt = xprt->timeout->to_retries + 1;
2166                 unsigned int opt_on = 1;
2167
2168                 /* TCP Keepalive options */
2169                 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2170                                 (char *)&opt_on, sizeof(opt_on));
2171                 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2172                                 (char *)&keepidle, sizeof(keepidle));
2173                 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2174                                 (char *)&keepidle, sizeof(keepidle));
2175                 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2176                                 (char *)&keepcnt, sizeof(keepcnt));
2177
2178                 write_lock_bh(&sk->sk_callback_lock);
2179
2180                 xs_save_old_callbacks(transport, sk);
2181
2182                 sk->sk_user_data = xprt;
2183                 sk->sk_data_ready = xs_tcp_data_ready;
2184                 sk->sk_state_change = xs_tcp_state_change;
2185                 sk->sk_write_space = xs_tcp_write_space;
2186                 sk->sk_error_report = xs_error_report;
2187                 sk->sk_allocation = GFP_ATOMIC;
2188
2189                 /* socket options */
2190                 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
2191                 sock_reset_flag(sk, SOCK_LINGER);
2192                 tcp_sk(sk)->linger2 = 0;
2193                 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2194
2195                 xprt_clear_connected(xprt);
2196
2197                 /* Reset to new socket */
2198                 transport->sock = sock;
2199                 transport->inet = sk;
2200
2201                 write_unlock_bh(&sk->sk_callback_lock);
2202         }
2203
2204         if (!xprt_bound(xprt))
2205                 goto out;
2206
2207         xs_set_memalloc(xprt);
2208
2209         /* Tell the socket layer to start connecting... */
2210         xprt->stat.connect_count++;
2211         xprt->stat.connect_start = jiffies;
2212         ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2213         switch (ret) {
2214         case 0:
2215         case -EINPROGRESS:
2216                 /* SYN_SENT! */
2217                 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2218                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2219         }
2220 out:
2221         return ret;
2222 }
2223
2224 /**
2225  * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2226  * @xprt: RPC transport to connect
2227  * @transport: socket transport to connect
2228  * @create_sock: function to create a socket of the correct type
2229  *
2230  * Invoked by a work queue tasklet.
2231  */
2232 static void xs_tcp_setup_socket(struct work_struct *work)
2233 {
2234         struct sock_xprt *transport =
2235                 container_of(work, struct sock_xprt, connect_worker.work);
2236         struct socket *sock = transport->sock;
2237         struct rpc_xprt *xprt = &transport->xprt;
2238         int status = -EIO;
2239
2240         current->flags |= PF_FSTRANS;
2241
2242         if (!sock) {
2243                 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
2244                 sock = xs_create_sock(xprt, transport,
2245                                 xs_addr(xprt)->sa_family, SOCK_STREAM, IPPROTO_TCP);
2246                 if (IS_ERR(sock)) {
2247                         status = PTR_ERR(sock);
2248                         goto out;
2249                 }
2250         } else {
2251                 int abort_and_exit;
2252
2253                 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
2254                                 &xprt->state);
2255                 /* "close" the socket, preserving the local port */
2256                 set_bit(XPRT_CONNECTION_REUSE, &xprt->state);
2257                 xs_tcp_reuse_connection(transport);
2258                 clear_bit(XPRT_CONNECTION_REUSE, &xprt->state);
2259
2260                 if (abort_and_exit)
2261                         goto out_eagain;
2262         }
2263
2264         dprintk("RPC:       worker connecting xprt %p via %s to "
2265                                 "%s (port %s)\n", xprt,
2266                         xprt->address_strings[RPC_DISPLAY_PROTO],
2267                         xprt->address_strings[RPC_DISPLAY_ADDR],
2268                         xprt->address_strings[RPC_DISPLAY_PORT]);
2269
2270         status = xs_tcp_finish_connecting(xprt, sock);
2271         trace_rpc_socket_connect(xprt, sock, status);
2272         dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
2273                         xprt, -status, xprt_connected(xprt),
2274                         sock->sk->sk_state);
2275         switch (status) {
2276         default:
2277                 printk("%s: connect returned unhandled error %d\n",
2278                         __func__, status);
2279         case -EADDRNOTAVAIL:
2280                 /* We're probably in TIME_WAIT. Get rid of existing socket,
2281                  * and retry
2282                  */
2283                 xs_tcp_force_close(xprt);
2284                 break;
2285         case 0:
2286         case -EINPROGRESS:
2287         case -EALREADY:
2288                 xprt_clear_connecting(xprt);
2289                 current->flags &= ~PF_FSTRANS;
2290                 return;
2291         case -EINVAL:
2292                 /* Happens, for instance, if the user specified a link
2293                  * local IPv6 address without a scope-id.
2294                  */
2295         case -ECONNREFUSED:
2296         case -ECONNRESET:
2297         case -ENETUNREACH:
2298                 /* retry with existing socket, after a delay */
2299                 goto out;
2300         }
2301 out_eagain:
2302         status = -EAGAIN;
2303 out:
2304         xprt_clear_connecting(xprt);
2305         xprt_wake_pending_tasks(xprt, status);
2306         current->flags &= ~PF_FSTRANS;
2307 }
2308
2309 /**
2310  * xs_connect - connect a socket to a remote endpoint
2311  * @xprt: pointer to transport structure
2312  * @task: address of RPC task that manages state of connect request
2313  *
2314  * TCP: If the remote end dropped the connection, delay reconnecting.
2315  *
2316  * UDP socket connects are synchronous, but we use a work queue anyway
2317  * to guarantee that even unprivileged user processes can set up a
2318  * socket on a privileged port.
2319  *
2320  * If a UDP socket connect fails, the delay behavior here prevents
2321  * retry floods (hard mounts).
2322  */
2323 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2324 {
2325         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2326
2327         if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
2328                 dprintk("RPC:       xs_connect delayed xprt %p for %lu "
2329                                 "seconds\n",
2330                                 xprt, xprt->reestablish_timeout / HZ);
2331                 queue_delayed_work(rpciod_workqueue,
2332                                    &transport->connect_worker,
2333                                    xprt->reestablish_timeout);
2334                 xprt->reestablish_timeout <<= 1;
2335                 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2336                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2337                 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2338                         xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2339         } else {
2340                 dprintk("RPC:       xs_connect scheduled xprt %p\n", xprt);
2341                 queue_delayed_work(rpciod_workqueue,
2342                                    &transport->connect_worker, 0);
2343         }
2344 }
2345
2346 /**
2347  * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2348  * @xprt: rpc_xprt struct containing statistics
2349  * @seq: output file
2350  *
2351  */
2352 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2353 {
2354         long idle_time = 0;
2355
2356         if (xprt_connected(xprt))
2357                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2358
2359         seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2360                         "%llu %llu %lu %llu %llu\n",
2361                         xprt->stat.bind_count,
2362                         xprt->stat.connect_count,
2363                         xprt->stat.connect_time,
2364                         idle_time,
2365                         xprt->stat.sends,
2366                         xprt->stat.recvs,
2367                         xprt->stat.bad_xids,
2368                         xprt->stat.req_u,
2369                         xprt->stat.bklog_u,
2370                         xprt->stat.max_slots,
2371                         xprt->stat.sending_u,
2372                         xprt->stat.pending_u);
2373 }
2374
2375 /**
2376  * xs_udp_print_stats - display UDP socket-specifc stats
2377  * @xprt: rpc_xprt struct containing statistics
2378  * @seq: output file
2379  *
2380  */
2381 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2382 {
2383         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2384
2385         seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2386                         "%lu %llu %llu\n",
2387                         transport->srcport,
2388                         xprt->stat.bind_count,
2389                         xprt->stat.sends,
2390                         xprt->stat.recvs,
2391                         xprt->stat.bad_xids,
2392                         xprt->stat.req_u,
2393                         xprt->stat.bklog_u,
2394                         xprt->stat.max_slots,
2395                         xprt->stat.sending_u,
2396                         xprt->stat.pending_u);
2397 }
2398
2399 /**
2400  * xs_tcp_print_stats - display TCP socket-specifc stats
2401  * @xprt: rpc_xprt struct containing statistics
2402  * @seq: output file
2403  *
2404  */
2405 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2406 {
2407         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2408         long idle_time = 0;
2409
2410         if (xprt_connected(xprt))
2411                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2412
2413         seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2414                         "%llu %llu %lu %llu %llu\n",
2415                         transport->srcport,
2416                         xprt->stat.bind_count,
2417                         xprt->stat.connect_count,
2418                         xprt->stat.connect_time,
2419                         idle_time,
2420                         xprt->stat.sends,
2421                         xprt->stat.recvs,
2422                         xprt->stat.bad_xids,
2423                         xprt->stat.req_u,
2424                         xprt->stat.bklog_u,
2425                         xprt->stat.max_slots,
2426                         xprt->stat.sending_u,
2427                         xprt->stat.pending_u);
2428 }
2429
2430 /*
2431  * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2432  * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2433  * to use the server side send routines.
2434  */
2435 static void *bc_malloc(struct rpc_task *task, size_t size)
2436 {
2437         struct page *page;
2438         struct rpc_buffer *buf;
2439
2440         WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2441         if (size > PAGE_SIZE - sizeof(struct rpc_buffer))
2442                 return NULL;
2443
2444         page = alloc_page(GFP_KERNEL);
2445         if (!page)
2446                 return NULL;
2447
2448         buf = page_address(page);
2449         buf->len = PAGE_SIZE;
2450
2451         return buf->data;
2452 }
2453
2454 /*
2455  * Free the space allocated in the bc_alloc routine
2456  */
2457 static void bc_free(void *buffer)
2458 {
2459         struct rpc_buffer *buf;
2460
2461         if (!buffer)
2462                 return;
2463
2464         buf = container_of(buffer, struct rpc_buffer, data);
2465         free_page((unsigned long)buf);
2466 }
2467
2468 /*
2469  * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2470  * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2471  */
2472 static int bc_sendto(struct rpc_rqst *req)
2473 {
2474         int len;
2475         struct xdr_buf *xbufp = &req->rq_snd_buf;
2476         struct rpc_xprt *xprt = req->rq_xprt;
2477         struct sock_xprt *transport =
2478                                 container_of(xprt, struct sock_xprt, xprt);
2479         struct socket *sock = transport->sock;
2480         unsigned long headoff;
2481         unsigned long tailoff;
2482
2483         xs_encode_stream_record_marker(xbufp);
2484
2485         tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2486         headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2487         len = svc_send_common(sock, xbufp,
2488                               virt_to_page(xbufp->head[0].iov_base), headoff,
2489                               xbufp->tail[0].iov_base, tailoff);
2490
2491         if (len != xbufp->len) {
2492                 printk(KERN_NOTICE "Error sending entire callback!\n");
2493                 len = -EAGAIN;
2494         }
2495
2496         return len;
2497 }
2498
2499 /*
2500  * The send routine. Borrows from svc_send
2501  */
2502 static int bc_send_request(struct rpc_task *task)
2503 {
2504         struct rpc_rqst *req = task->tk_rqstp;
2505         struct svc_xprt *xprt;
2506         u32                     len;
2507
2508         dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2509         /*
2510          * Get the server socket associated with this callback xprt
2511          */
2512         xprt = req->rq_xprt->bc_xprt;
2513
2514         /*
2515          * Grab the mutex to serialize data as the connection is shared
2516          * with the fore channel
2517          */
2518         if (!mutex_trylock(&xprt->xpt_mutex)) {
2519                 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2520                 if (!mutex_trylock(&xprt->xpt_mutex))
2521                         return -EAGAIN;
2522                 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2523         }
2524         if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2525                 len = -ENOTCONN;
2526         else
2527                 len = bc_sendto(req);
2528         mutex_unlock(&xprt->xpt_mutex);
2529
2530         if (len > 0)
2531                 len = 0;
2532
2533         return len;
2534 }
2535
2536 /*
2537  * The close routine. Since this is client initiated, we do nothing
2538  */
2539
2540 static void bc_close(struct rpc_xprt *xprt)
2541 {
2542 }
2543
2544 /*
2545  * The xprt destroy routine. Again, because this connection is client
2546  * initiated, we do nothing
2547  */
2548
2549 static void bc_destroy(struct rpc_xprt *xprt)
2550 {
2551 }
2552
2553 static struct rpc_xprt_ops xs_local_ops = {
2554         .reserve_xprt           = xprt_reserve_xprt,
2555         .release_xprt           = xs_tcp_release_xprt,
2556         .alloc_slot             = xprt_alloc_slot,
2557         .rpcbind                = xs_local_rpcbind,
2558         .set_port               = xs_local_set_port,
2559         .connect                = xs_local_connect,
2560         .buf_alloc              = rpc_malloc,
2561         .buf_free               = rpc_free,
2562         .send_request           = xs_local_send_request,
2563         .set_retrans_timeout    = xprt_set_retrans_timeout_def,
2564         .close                  = xs_close,
2565         .destroy                = xs_destroy,
2566         .print_stats            = xs_local_print_stats,
2567 };
2568
2569 static struct rpc_xprt_ops xs_udp_ops = {
2570         .set_buffer_size        = xs_udp_set_buffer_size,
2571         .reserve_xprt           = xprt_reserve_xprt_cong,
2572         .release_xprt           = xprt_release_xprt_cong,
2573         .alloc_slot             = xprt_alloc_slot,
2574         .rpcbind                = rpcb_getport_async,
2575         .set_port               = xs_set_port,
2576         .connect                = xs_connect,
2577         .buf_alloc              = rpc_malloc,
2578         .buf_free               = rpc_free,
2579         .send_request           = xs_udp_send_request,
2580         .set_retrans_timeout    = xprt_set_retrans_timeout_rtt,
2581         .timer                  = xs_udp_timer,
2582         .release_request        = xprt_release_rqst_cong,
2583         .close                  = xs_close,
2584         .destroy                = xs_destroy,
2585         .print_stats            = xs_udp_print_stats,
2586 };
2587
2588 static struct rpc_xprt_ops xs_tcp_ops = {
2589         .reserve_xprt           = xprt_reserve_xprt,
2590         .release_xprt           = xs_tcp_release_xprt,
2591         .alloc_slot             = xprt_lock_and_alloc_slot,
2592         .rpcbind                = rpcb_getport_async,
2593         .set_port               = xs_set_port,
2594         .connect                = xs_connect,
2595         .buf_alloc              = rpc_malloc,
2596         .buf_free               = rpc_free,
2597         .send_request           = xs_tcp_send_request,
2598         .set_retrans_timeout    = xprt_set_retrans_timeout_def,
2599         .close                  = xs_tcp_close,
2600         .destroy                = xs_destroy,
2601         .print_stats            = xs_tcp_print_stats,
2602 };
2603
2604 /*
2605  * The rpc_xprt_ops for the server backchannel
2606  */
2607
2608 static struct rpc_xprt_ops bc_tcp_ops = {
2609         .reserve_xprt           = xprt_reserve_xprt,
2610         .release_xprt           = xprt_release_xprt,
2611         .alloc_slot             = xprt_alloc_slot,
2612         .buf_alloc              = bc_malloc,
2613         .buf_free               = bc_free,
2614         .send_request           = bc_send_request,
2615         .set_retrans_timeout    = xprt_set_retrans_timeout_def,
2616         .close                  = bc_close,
2617         .destroy                = bc_destroy,
2618         .print_stats            = xs_tcp_print_stats,
2619 };
2620
2621 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2622 {
2623         static const struct sockaddr_in sin = {
2624                 .sin_family             = AF_INET,
2625                 .sin_addr.s_addr        = htonl(INADDR_ANY),
2626         };
2627         static const struct sockaddr_in6 sin6 = {
2628                 .sin6_family            = AF_INET6,
2629                 .sin6_addr              = IN6ADDR_ANY_INIT,
2630         };
2631
2632         switch (family) {
2633         case AF_LOCAL:
2634                 break;
2635         case AF_INET:
2636                 memcpy(sap, &sin, sizeof(sin));
2637                 break;
2638         case AF_INET6:
2639                 memcpy(sap, &sin6, sizeof(sin6));
2640                 break;
2641         default:
2642                 dprintk("RPC:       %s: Bad address family\n", __func__);
2643                 return -EAFNOSUPPORT;
2644         }
2645         return 0;
2646 }
2647
2648 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2649                                       unsigned int slot_table_size,
2650                                       unsigned int max_slot_table_size)
2651 {
2652         struct rpc_xprt *xprt;
2653         struct sock_xprt *new;
2654
2655         if (args->addrlen > sizeof(xprt->addr)) {
2656                 dprintk("RPC:       xs_setup_xprt: address too large\n");
2657                 return ERR_PTR(-EBADF);
2658         }
2659
2660         xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2661                         max_slot_table_size);
2662         if (xprt == NULL) {
2663                 dprintk("RPC:       xs_setup_xprt: couldn't allocate "
2664                                 "rpc_xprt\n");
2665                 return ERR_PTR(-ENOMEM);
2666         }
2667
2668         new = container_of(xprt, struct sock_xprt, xprt);
2669         memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2670         xprt->addrlen = args->addrlen;
2671         if (args->srcaddr)
2672                 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2673         else {
2674                 int err;
2675                 err = xs_init_anyaddr(args->dstaddr->sa_family,
2676                                         (struct sockaddr *)&new->srcaddr);
2677                 if (err != 0) {
2678                         xprt_free(xprt);
2679                         return ERR_PTR(err);
2680                 }
2681         }
2682
2683         return xprt;
2684 }
2685
2686 static const struct rpc_timeout xs_local_default_timeout = {
2687         .to_initval = 10 * HZ,
2688         .to_maxval = 10 * HZ,
2689         .to_retries = 2,
2690 };
2691
2692 /**
2693  * xs_setup_local - Set up transport to use an AF_LOCAL socket
2694  * @args: rpc transport creation arguments
2695  *
2696  * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2697  */
2698 static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2699 {
2700         struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2701         struct sock_xprt *transport;
2702         struct rpc_xprt *xprt;
2703         struct rpc_xprt *ret;
2704
2705         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2706                         xprt_max_tcp_slot_table_entries);
2707         if (IS_ERR(xprt))
2708                 return xprt;
2709         transport = container_of(xprt, struct sock_xprt, xprt);
2710
2711         xprt->prot = 0;
2712         xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2713         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2714
2715         xprt->bind_timeout = XS_BIND_TO;
2716         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2717         xprt->idle_timeout = XS_IDLE_DISC_TO;
2718
2719         xprt->ops = &xs_local_ops;
2720         xprt->timeout = &xs_local_default_timeout;
2721
2722         INIT_DELAYED_WORK(&transport->connect_worker,
2723                         xs_dummy_setup_socket);
2724
2725         switch (sun->sun_family) {
2726         case AF_LOCAL:
2727                 if (sun->sun_path[0] != '/') {
2728                         dprintk("RPC:       bad AF_LOCAL address: %s\n",
2729                                         sun->sun_path);
2730                         ret = ERR_PTR(-EINVAL);
2731                         goto out_err;
2732                 }
2733                 xprt_set_bound(xprt);
2734                 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2735                 ret = ERR_PTR(xs_local_setup_socket(transport));
2736                 if (ret)
2737                         goto out_err;
2738                 break;
2739         default:
2740                 ret = ERR_PTR(-EAFNOSUPPORT);
2741                 goto out_err;
2742         }
2743
2744         dprintk("RPC:       set up xprt to %s via AF_LOCAL\n",
2745                         xprt->address_strings[RPC_DISPLAY_ADDR]);
2746
2747         if (try_module_get(THIS_MODULE))
2748                 return xprt;
2749         ret = ERR_PTR(-EINVAL);
2750 out_err:
2751         xprt_free(xprt);
2752         return ret;
2753 }
2754
2755 static const struct rpc_timeout xs_udp_default_timeout = {
2756         .to_initval = 5 * HZ,
2757         .to_maxval = 30 * HZ,
2758         .to_increment = 5 * HZ,
2759         .to_retries = 5,
2760 };
2761
2762 /**
2763  * xs_setup_udp - Set up transport to use a UDP socket
2764  * @args: rpc transport creation arguments
2765  *
2766  */
2767 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2768 {
2769         struct sockaddr *addr = args->dstaddr;
2770         struct rpc_xprt *xprt;
2771         struct sock_xprt *transport;
2772         struct rpc_xprt *ret;
2773
2774         xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2775                         xprt_udp_slot_table_entries);
2776         if (IS_ERR(xprt))
2777                 return xprt;
2778         transport = container_of(xprt, struct sock_xprt, xprt);
2779
2780         xprt->prot = IPPROTO_UDP;
2781         xprt->tsh_size = 0;
2782         /* XXX: header size can vary due to auth type, IPv6, etc. */
2783         xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2784
2785         xprt->bind_timeout = XS_BIND_TO;
2786         xprt->reestablish_timeout = XS_UDP_REEST_TO;
2787         xprt->idle_timeout = XS_IDLE_DISC_TO;
2788
2789         xprt->ops = &xs_udp_ops;
2790
2791         xprt->timeout = &xs_udp_default_timeout;
2792
2793         switch (addr->sa_family) {
2794         case AF_INET:
2795                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2796                         xprt_set_bound(xprt);
2797
2798                 INIT_DELAYED_WORK(&transport->connect_worker,
2799                                         xs_udp_setup_socket);
2800                 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2801                 break;
2802         case AF_INET6:
2803                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2804                         xprt_set_bound(xprt);
2805
2806                 INIT_DELAYED_WORK(&transport->connect_worker,
2807                                         xs_udp_setup_socket);
2808                 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2809                 break;
2810         default:
2811                 ret = ERR_PTR(-EAFNOSUPPORT);
2812                 goto out_err;
2813         }
2814
2815         if (xprt_bound(xprt))
2816                 dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
2817                                 xprt->address_strings[RPC_DISPLAY_ADDR],
2818                                 xprt->address_strings[RPC_DISPLAY_PORT],
2819                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
2820         else
2821                 dprintk("RPC:       set up xprt to %s (autobind) via %s\n",
2822                                 xprt->address_strings[RPC_DISPLAY_ADDR],
2823                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
2824
2825         if (try_module_get(THIS_MODULE))
2826                 return xprt;
2827         ret = ERR_PTR(-EINVAL);
2828 out_err:
2829         xprt_free(xprt);
2830         return ret;
2831 }
2832
2833 static const struct rpc_timeout xs_tcp_default_timeout = {
2834         .to_initval = 60 * HZ,
2835         .to_maxval = 60 * HZ,
2836         .to_retries = 2,
2837 };
2838
2839 /**
2840  * xs_setup_tcp - Set up transport to use a TCP socket
2841  * @args: rpc transport creation arguments
2842  *
2843  */
2844 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2845 {
2846         struct sockaddr *addr = args->dstaddr;
2847         struct rpc_xprt *xprt;
2848         struct sock_xprt *transport;
2849         struct rpc_xprt *ret;
2850         unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2851
2852         if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2853                 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2854
2855         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2856                         max_slot_table_size);
2857         if (IS_ERR(xprt))
2858                 return xprt;
2859         transport = container_of(xprt, struct sock_xprt, xprt);
2860
2861         xprt->prot = IPPROTO_TCP;
2862         xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2863         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2864
2865         xprt->bind_timeout = XS_BIND_TO;
2866         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2867         xprt->idle_timeout = XS_IDLE_DISC_TO;
2868
2869         xprt->ops = &xs_tcp_ops;
2870         xprt->timeout = &xs_tcp_default_timeout;
2871
2872         switch (addr->sa_family) {
2873         case AF_INET:
2874                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2875                         xprt_set_bound(xprt);
2876
2877                 INIT_DELAYED_WORK(&transport->connect_worker,
2878                                         xs_tcp_setup_socket);
2879                 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2880                 break;
2881         case AF_INET6:
2882                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2883                         xprt_set_bound(xprt);
2884
2885                 INIT_DELAYED_WORK(&transport->connect_worker,
2886                                         xs_tcp_setup_socket);
2887                 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2888                 break;
2889         default:
2890                 ret = ERR_PTR(-EAFNOSUPPORT);
2891                 goto out_err;
2892         }
2893
2894         if (xprt_bound(xprt))
2895                 dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
2896                                 xprt->address_strings[RPC_DISPLAY_ADDR],
2897                                 xprt->address_strings[RPC_DISPLAY_PORT],
2898                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
2899         else
2900                 dprintk("RPC:       set up xprt to %s (autobind) via %s\n",
2901                                 xprt->address_strings[RPC_DISPLAY_ADDR],
2902                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
2903
2904
2905         if (try_module_get(THIS_MODULE))
2906                 return xprt;
2907         ret = ERR_PTR(-EINVAL);
2908 out_err:
2909         xprt_free(xprt);
2910         return ret;
2911 }
2912
2913 /**
2914  * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2915  * @args: rpc transport creation arguments
2916  *
2917  */
2918 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2919 {
2920         struct sockaddr *addr = args->dstaddr;
2921         struct rpc_xprt *xprt;
2922         struct sock_xprt *transport;
2923         struct svc_sock *bc_sock;
2924         struct rpc_xprt *ret;
2925
2926         if (args->bc_xprt->xpt_bc_xprt) {
2927                 /*
2928                  * This server connection already has a backchannel
2929                  * transport; we can't create a new one, as we wouldn't
2930                  * be able to match replies based on xid any more.  So,
2931                  * reuse the already-existing one:
2932                  */
2933                  return args->bc_xprt->xpt_bc_xprt;
2934         }
2935         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2936                         xprt_tcp_slot_table_entries);
2937         if (IS_ERR(xprt))
2938                 return xprt;
2939         transport = container_of(xprt, struct sock_xprt, xprt);
2940
2941         xprt->prot = IPPROTO_TCP;
2942         xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2943         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2944         xprt->timeout = &xs_tcp_default_timeout;
2945
2946         /* backchannel */
2947         xprt_set_bound(xprt);
2948         xprt->bind_timeout = 0;
2949         xprt->reestablish_timeout = 0;
2950         xprt->idle_timeout = 0;
2951
2952         xprt->ops = &bc_tcp_ops;
2953
2954         switch (addr->sa_family) {
2955         case AF_INET:
2956                 xs_format_peer_addresses(xprt, "tcp",
2957                                          RPCBIND_NETID_TCP);
2958                 break;
2959         case AF_INET6:
2960                 xs_format_peer_addresses(xprt, "tcp",
2961                                    RPCBIND_NETID_TCP6);
2962                 break;
2963         default:
2964                 ret = ERR_PTR(-EAFNOSUPPORT);
2965                 goto out_err;
2966         }
2967
2968         dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
2969                         xprt->address_strings[RPC_DISPLAY_ADDR],
2970                         xprt->address_strings[RPC_DISPLAY_PORT],
2971                         xprt->address_strings[RPC_DISPLAY_PROTO]);
2972
2973         /*
2974          * Once we've associated a backchannel xprt with a connection,
2975          * we want to keep it around as long as the connection lasts,
2976          * in case we need to start using it for a backchannel again;
2977          * this reference won't be dropped until bc_xprt is destroyed.
2978          */
2979         xprt_get(xprt);
2980         args->bc_xprt->xpt_bc_xprt = xprt;
2981         xprt->bc_xprt = args->bc_xprt;
2982         bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2983         transport->sock = bc_sock->sk_sock;
2984         transport->inet = bc_sock->sk_sk;
2985
2986         /*
2987          * Since we don't want connections for the backchannel, we set
2988          * the xprt status to connected
2989          */
2990         xprt_set_connected(xprt);
2991
2992
2993         if (try_module_get(THIS_MODULE))
2994                 return xprt;
2995         xprt_put(xprt);
2996         ret = ERR_PTR(-EINVAL);
2997 out_err:
2998         xprt_free(xprt);
2999         return ret;
3000 }
3001
3002 static struct xprt_class        xs_local_transport = {
3003         .list           = LIST_HEAD_INIT(xs_local_transport.list),
3004         .name           = "named UNIX socket",
3005         .owner          = THIS_MODULE,
3006         .ident          = XPRT_TRANSPORT_LOCAL,
3007         .setup          = xs_setup_local,
3008 };
3009
3010 static struct xprt_class        xs_udp_transport = {
3011         .list           = LIST_HEAD_INIT(xs_udp_transport.list),
3012         .name           = "udp",
3013         .owner          = THIS_MODULE,
3014         .ident          = XPRT_TRANSPORT_UDP,
3015         .setup          = xs_setup_udp,
3016 };
3017
3018 static struct xprt_class        xs_tcp_transport = {
3019         .list           = LIST_HEAD_INIT(xs_tcp_transport.list),
3020         .name           = "tcp",
3021         .owner          = THIS_MODULE,
3022         .ident          = XPRT_TRANSPORT_TCP,
3023         .setup          = xs_setup_tcp,
3024 };
3025
3026 static struct xprt_class        xs_bc_tcp_transport = {
3027         .list           = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3028         .name           = "tcp NFSv4.1 backchannel",
3029         .owner          = THIS_MODULE,
3030         .ident          = XPRT_TRANSPORT_BC_TCP,
3031         .setup          = xs_setup_bc_tcp,
3032 };
3033
3034 /**
3035  * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3036  *
3037  */
3038 int init_socket_xprt(void)
3039 {
3040 #ifdef RPC_DEBUG
3041         if (!sunrpc_table_header)
3042                 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3043 #endif
3044
3045         xprt_register_transport(&xs_local_transport);
3046         xprt_register_transport(&xs_udp_transport);
3047         xprt_register_transport(&xs_tcp_transport);
3048         xprt_register_transport(&xs_bc_tcp_transport);
3049
3050         return 0;
3051 }
3052
3053 /**
3054  * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3055  *
3056  */
3057 void cleanup_socket_xprt(void)
3058 {
3059 #ifdef RPC_DEBUG
3060         if (sunrpc_table_header) {
3061                 unregister_sysctl_table(sunrpc_table_header);
3062                 sunrpc_table_header = NULL;
3063         }
3064 #endif
3065
3066         xprt_unregister_transport(&xs_local_transport);
3067         xprt_unregister_transport(&xs_udp_transport);
3068         xprt_unregister_transport(&xs_tcp_transport);
3069         xprt_unregister_transport(&xs_bc_tcp_transport);
3070 }
3071
3072 static int param_set_uint_minmax(const char *val,
3073                 const struct kernel_param *kp,
3074                 unsigned int min, unsigned int max)
3075 {
3076         unsigned long num;
3077         int ret;
3078
3079         if (!val)
3080                 return -EINVAL;
3081         ret = strict_strtoul(val, 0, &num);
3082         if (ret == -EINVAL || num < min || num > max)
3083                 return -EINVAL;
3084         *((unsigned int *)kp->arg) = num;
3085         return 0;
3086 }
3087
3088 static int param_set_portnr(const char *val, const struct kernel_param *kp)
3089 {
3090         return param_set_uint_minmax(val, kp,
3091                         RPC_MIN_RESVPORT,
3092                         RPC_MAX_RESVPORT);
3093 }
3094
3095 static struct kernel_param_ops param_ops_portnr = {
3096         .set = param_set_portnr,
3097         .get = param_get_uint,
3098 };
3099
3100 #define param_check_portnr(name, p) \
3101         __param_check(name, p, unsigned int);
3102
3103 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3104 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3105
3106 static int param_set_slot_table_size(const char *val,
3107                                      const struct kernel_param *kp)
3108 {
3109         return param_set_uint_minmax(val, kp,
3110                         RPC_MIN_SLOT_TABLE,
3111                         RPC_MAX_SLOT_TABLE);
3112 }
3113
3114 static struct kernel_param_ops param_ops_slot_table_size = {
3115         .set = param_set_slot_table_size,
3116         .get = param_get_uint,
3117 };
3118
3119 #define param_check_slot_table_size(name, p) \
3120         __param_check(name, p, unsigned int);
3121
3122 static int param_set_max_slot_table_size(const char *val,
3123                                      const struct kernel_param *kp)
3124 {
3125         return param_set_uint_minmax(val, kp,
3126                         RPC_MIN_SLOT_TABLE,
3127                         RPC_MAX_SLOT_TABLE_LIMIT);
3128 }
3129
3130 static struct kernel_param_ops param_ops_max_slot_table_size = {
3131         .set = param_set_max_slot_table_size,
3132         .get = param_get_uint,
3133 };
3134
3135 #define param_check_max_slot_table_size(name, p) \
3136         __param_check(name, p, unsigned int);
3137
3138 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3139                    slot_table_size, 0644);
3140 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3141                    max_slot_table_size, 0644);
3142 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3143                    slot_table_size, 0644);
3144