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Linux/net/sunrpc/xprtsock.c

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  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 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
 67 
 68 #define XS_TCP_LINGER_TO        (15U * HZ)
 69 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
 70 
 71 /*
 72  * We can register our own files under /proc/sys/sunrpc by
 73  * calling register_sysctl_table() again.  The files in that
 74  * directory become the union of all files registered there.
 75  *
 76  * We simply need to make sure that we don't collide with
 77  * someone else's file names!
 78  */
 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 #if IS_ENABLED(CONFIG_SUNRPC_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 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
220 {
221         return (struct rpc_xprt *) sk->sk_user_data;
222 }
223 
224 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
225 {
226         return (struct sockaddr *) &xprt->addr;
227 }
228 
229 static inline struct sockaddr_un *xs_addr_un(struct rpc_xprt *xprt)
230 {
231         return (struct sockaddr_un *) &xprt->addr;
232 }
233 
234 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
235 {
236         return (struct sockaddr_in *) &xprt->addr;
237 }
238 
239 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
240 {
241         return (struct sockaddr_in6 *) &xprt->addr;
242 }
243 
244 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
245 {
246         struct sockaddr *sap = xs_addr(xprt);
247         struct sockaddr_in6 *sin6;
248         struct sockaddr_in *sin;
249         struct sockaddr_un *sun;
250         char buf[128];
251 
252         switch (sap->sa_family) {
253         case AF_LOCAL:
254                 sun = xs_addr_un(xprt);
255                 strlcpy(buf, sun->sun_path, sizeof(buf));
256                 xprt->address_strings[RPC_DISPLAY_ADDR] =
257                                                 kstrdup(buf, GFP_KERNEL);
258                 break;
259         case AF_INET:
260                 (void)rpc_ntop(sap, buf, sizeof(buf));
261                 xprt->address_strings[RPC_DISPLAY_ADDR] =
262                                                 kstrdup(buf, GFP_KERNEL);
263                 sin = xs_addr_in(xprt);
264                 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
265                 break;
266         case AF_INET6:
267                 (void)rpc_ntop(sap, buf, sizeof(buf));
268                 xprt->address_strings[RPC_DISPLAY_ADDR] =
269                                                 kstrdup(buf, GFP_KERNEL);
270                 sin6 = xs_addr_in6(xprt);
271                 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
272                 break;
273         default:
274                 BUG();
275         }
276 
277         xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
278 }
279 
280 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
281 {
282         struct sockaddr *sap = xs_addr(xprt);
283         char buf[128];
284 
285         snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
286         xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
287 
288         snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
289         xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
290 }
291 
292 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
293                                      const char *protocol,
294                                      const char *netid)
295 {
296         xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
297         xprt->address_strings[RPC_DISPLAY_NETID] = netid;
298         xs_format_common_peer_addresses(xprt);
299         xs_format_common_peer_ports(xprt);
300 }
301 
302 static void xs_update_peer_port(struct rpc_xprt *xprt)
303 {
304         kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
305         kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
306 
307         xs_format_common_peer_ports(xprt);
308 }
309 
310 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
311 {
312         unsigned int i;
313 
314         for (i = 0; i < RPC_DISPLAY_MAX; i++)
315                 switch (i) {
316                 case RPC_DISPLAY_PROTO:
317                 case RPC_DISPLAY_NETID:
318                         continue;
319                 default:
320                         kfree(xprt->address_strings[i]);
321                 }
322 }
323 
324 #define XS_SENDMSG_FLAGS        (MSG_DONTWAIT | MSG_NOSIGNAL)
325 
326 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
327 {
328         struct msghdr msg = {
329                 .msg_name       = addr,
330                 .msg_namelen    = addrlen,
331                 .msg_flags      = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
332         };
333         struct kvec iov = {
334                 .iov_base       = vec->iov_base + base,
335                 .iov_len        = vec->iov_len - base,
336         };
337 
338         if (iov.iov_len != 0)
339                 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
340         return kernel_sendmsg(sock, &msg, NULL, 0, 0);
341 }
342 
343 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more, bool zerocopy, int *sent_p)
344 {
345         ssize_t (*do_sendpage)(struct socket *sock, struct page *page,
346                         int offset, size_t size, int flags);
347         struct page **ppage;
348         unsigned int remainder;
349         int err;
350 
351         remainder = xdr->page_len - base;
352         base += xdr->page_base;
353         ppage = xdr->pages + (base >> PAGE_SHIFT);
354         base &= ~PAGE_MASK;
355         do_sendpage = sock->ops->sendpage;
356         if (!zerocopy)
357                 do_sendpage = sock_no_sendpage;
358         for(;;) {
359                 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
360                 int flags = XS_SENDMSG_FLAGS;
361 
362                 remainder -= len;
363                 if (more)
364                         flags |= MSG_MORE;
365                 if (remainder != 0)
366                         flags |= MSG_SENDPAGE_NOTLAST | MSG_MORE;
367                 err = do_sendpage(sock, *ppage, base, len, flags);
368                 if (remainder == 0 || err != len)
369                         break;
370                 *sent_p += err;
371                 ppage++;
372                 base = 0;
373         }
374         if (err > 0) {
375                 *sent_p += err;
376                 err = 0;
377         }
378         return err;
379 }
380 
381 /**
382  * xs_sendpages - write pages directly to a socket
383  * @sock: socket to send on
384  * @addr: UDP only -- address of destination
385  * @addrlen: UDP only -- length of destination address
386  * @xdr: buffer containing this request
387  * @base: starting position in the buffer
388  * @zerocopy: true if it is safe to use sendpage()
389  * @sent_p: return the total number of bytes successfully queued for sending
390  *
391  */
392 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base, bool zerocopy, int *sent_p)
393 {
394         unsigned int remainder = xdr->len - base;
395         int err = 0;
396         int sent = 0;
397 
398         if (unlikely(!sock))
399                 return -ENOTSOCK;
400 
401         if (base != 0) {
402                 addr = NULL;
403                 addrlen = 0;
404         }
405 
406         if (base < xdr->head[0].iov_len || addr != NULL) {
407                 unsigned int len = xdr->head[0].iov_len - base;
408                 remainder -= len;
409                 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
410                 if (remainder == 0 || err != len)
411                         goto out;
412                 *sent_p += err;
413                 base = 0;
414         } else
415                 base -= xdr->head[0].iov_len;
416 
417         if (base < xdr->page_len) {
418                 unsigned int len = xdr->page_len - base;
419                 remainder -= len;
420                 err = xs_send_pagedata(sock, xdr, base, remainder != 0, zerocopy, &sent);
421                 *sent_p += sent;
422                 if (remainder == 0 || sent != len)
423                         goto out;
424                 base = 0;
425         } else
426                 base -= xdr->page_len;
427 
428         if (base >= xdr->tail[0].iov_len)
429                 return 0;
430         err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
431 out:
432         if (err > 0) {
433                 *sent_p += err;
434                 err = 0;
435         }
436         return err;
437 }
438 
439 static void xs_nospace_callback(struct rpc_task *task)
440 {
441         struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
442 
443         transport->inet->sk_write_pending--;
444 }
445 
446 /**
447  * xs_nospace - place task on wait queue if transmit was incomplete
448  * @task: task to put to sleep
449  *
450  */
451 static int xs_nospace(struct rpc_task *task)
452 {
453         struct rpc_rqst *req = task->tk_rqstp;
454         struct rpc_xprt *xprt = req->rq_xprt;
455         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
456         struct sock *sk = transport->inet;
457         int ret = -EAGAIN;
458 
459         dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
460                         task->tk_pid, req->rq_slen - req->rq_bytes_sent,
461                         req->rq_slen);
462 
463         /* Protect against races with write_space */
464         spin_lock_bh(&xprt->transport_lock);
465 
466         /* Don't race with disconnect */
467         if (xprt_connected(xprt)) {
468                 /* wait for more buffer space */
469                 sk->sk_write_pending++;
470                 xprt_wait_for_buffer_space(task, xs_nospace_callback);
471         } else
472                 ret = -ENOTCONN;
473 
474         spin_unlock_bh(&xprt->transport_lock);
475 
476         /* Race breaker in case memory is freed before above code is called */
477         sk->sk_write_space(sk);
478         return ret;
479 }
480 
481 /*
482  * Construct a stream transport record marker in @buf.
483  */
484 static inline void xs_encode_stream_record_marker(struct xdr_buf *buf)
485 {
486         u32 reclen = buf->len - sizeof(rpc_fraghdr);
487         rpc_fraghdr *base = buf->head[0].iov_base;
488         *base = cpu_to_be32(RPC_LAST_STREAM_FRAGMENT | reclen);
489 }
490 
491 /**
492  * xs_local_send_request - write an RPC request to an AF_LOCAL socket
493  * @task: RPC task that manages the state of an RPC request
494  *
495  * Return values:
496  *        0:    The request has been sent
497  *   EAGAIN:    The socket was blocked, please call again later to
498  *              complete the request
499  * ENOTCONN:    Caller needs to invoke connect logic then call again
500  *    other:    Some other error occured, the request was not sent
501  */
502 static int xs_local_send_request(struct rpc_task *task)
503 {
504         struct rpc_rqst *req = task->tk_rqstp;
505         struct rpc_xprt *xprt = req->rq_xprt;
506         struct sock_xprt *transport =
507                                 container_of(xprt, struct sock_xprt, xprt);
508         struct xdr_buf *xdr = &req->rq_snd_buf;
509         int status;
510         int sent = 0;
511 
512         xs_encode_stream_record_marker(&req->rq_snd_buf);
513 
514         xs_pktdump("packet data:",
515                         req->rq_svec->iov_base, req->rq_svec->iov_len);
516 
517         status = xs_sendpages(transport->sock, NULL, 0, xdr, req->rq_bytes_sent,
518                               true, &sent);
519         dprintk("RPC:       %s(%u) = %d\n",
520                         __func__, xdr->len - req->rq_bytes_sent, status);
521 
522         if (status == -EAGAIN && sock_writeable(transport->inet))
523                 status = -ENOBUFS;
524 
525         if (likely(sent > 0) || status == 0) {
526                 req->rq_bytes_sent += sent;
527                 req->rq_xmit_bytes_sent += sent;
528                 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
529                         req->rq_bytes_sent = 0;
530                         return 0;
531                 }
532                 status = -EAGAIN;
533         }
534 
535         switch (status) {
536         case -ENOBUFS:
537                 break;
538         case -EAGAIN:
539                 status = xs_nospace(task);
540                 break;
541         default:
542                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
543                         -status);
544         case -EPIPE:
545                 xs_close(xprt);
546                 status = -ENOTCONN;
547         }
548 
549         return status;
550 }
551 
552 /**
553  * xs_udp_send_request - write an RPC request to a UDP socket
554  * @task: address of RPC task that manages the state of an RPC request
555  *
556  * Return values:
557  *        0:    The request has been sent
558  *   EAGAIN:    The socket was blocked, please call again later to
559  *              complete the request
560  * ENOTCONN:    Caller needs to invoke connect logic then call again
561  *    other:    Some other error occurred, the request was not sent
562  */
563 static int xs_udp_send_request(struct rpc_task *task)
564 {
565         struct rpc_rqst *req = task->tk_rqstp;
566         struct rpc_xprt *xprt = req->rq_xprt;
567         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
568         struct xdr_buf *xdr = &req->rq_snd_buf;
569         int sent = 0;
570         int status;
571 
572         xs_pktdump("packet data:",
573                                 req->rq_svec->iov_base,
574                                 req->rq_svec->iov_len);
575 
576         if (!xprt_bound(xprt))
577                 return -ENOTCONN;
578         status = xs_sendpages(transport->sock, xs_addr(xprt), xprt->addrlen,
579                               xdr, req->rq_bytes_sent, true, &sent);
580 
581         dprintk("RPC:       xs_udp_send_request(%u) = %d\n",
582                         xdr->len - req->rq_bytes_sent, status);
583 
584         /* firewall is blocking us, don't return -EAGAIN or we end up looping */
585         if (status == -EPERM)
586                 goto process_status;
587 
588         if (status == -EAGAIN && sock_writeable(transport->inet))
589                 status = -ENOBUFS;
590 
591         if (sent > 0 || status == 0) {
592                 req->rq_xmit_bytes_sent += sent;
593                 if (sent >= req->rq_slen)
594                         return 0;
595                 /* Still some bytes left; set up for a retry later. */
596                 status = -EAGAIN;
597         }
598 
599 process_status:
600         switch (status) {
601         case -ENOTSOCK:
602                 status = -ENOTCONN;
603                 /* Should we call xs_close() here? */
604                 break;
605         case -EAGAIN:
606                 status = xs_nospace(task);
607                 break;
608         case -ENETUNREACH:
609         case -ENOBUFS:
610         case -EPIPE:
611         case -ECONNREFUSED:
612         case -EPERM:
613                 /* When the server has died, an ICMP port unreachable message
614                  * prompts ECONNREFUSED. */
615                 break;
616         default:
617                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
618                         -status);
619         }
620 
621         return status;
622 }
623 
624 /**
625  * xs_tcp_send_request - write an RPC request to a TCP socket
626  * @task: address of RPC task that manages the state of an RPC request
627  *
628  * Return values:
629  *        0:    The request has been sent
630  *   EAGAIN:    The socket was blocked, please call again later to
631  *              complete the request
632  * ENOTCONN:    Caller needs to invoke connect logic then call again
633  *    other:    Some other error occurred, the request was not sent
634  *
635  * XXX: In the case of soft timeouts, should we eventually give up
636  *      if sendmsg is not able to make progress?
637  */
638 static int xs_tcp_send_request(struct rpc_task *task)
639 {
640         struct rpc_rqst *req = task->tk_rqstp;
641         struct rpc_xprt *xprt = req->rq_xprt;
642         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
643         struct xdr_buf *xdr = &req->rq_snd_buf;
644         bool zerocopy = true;
645         int status;
646         int sent;
647 
648         xs_encode_stream_record_marker(&req->rq_snd_buf);
649 
650         xs_pktdump("packet data:",
651                                 req->rq_svec->iov_base,
652                                 req->rq_svec->iov_len);
653         /* Don't use zero copy if this is a resend. If the RPC call
654          * completes while the socket holds a reference to the pages,
655          * then we may end up resending corrupted data.
656          */
657         if (task->tk_flags & RPC_TASK_SENT)
658                 zerocopy = false;
659 
660         /* Continue transmitting the packet/record. We must be careful
661          * to cope with writespace callbacks arriving _after_ we have
662          * called sendmsg(). */
663         while (1) {
664                 sent = 0;
665                 status = xs_sendpages(transport->sock, NULL, 0, xdr,
666                                       req->rq_bytes_sent, zerocopy, &sent);
667 
668                 dprintk("RPC:       xs_tcp_send_request(%u) = %d\n",
669                                 xdr->len - req->rq_bytes_sent, status);
670 
671                 /* If we've sent the entire packet, immediately
672                  * reset the count of bytes sent. */
673                 req->rq_bytes_sent += sent;
674                 req->rq_xmit_bytes_sent += sent;
675                 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
676                         req->rq_bytes_sent = 0;
677                         return 0;
678                 }
679 
680                 if (status < 0)
681                         break;
682                 if (sent == 0) {
683                         status = -EAGAIN;
684                         break;
685                 }
686         }
687         if (status == -EAGAIN && sk_stream_is_writeable(transport->inet))
688                 status = -ENOBUFS;
689 
690         switch (status) {
691         case -ENOTSOCK:
692                 status = -ENOTCONN;
693                 /* Should we call xs_close() here? */
694                 break;
695         case -EAGAIN:
696                 status = xs_nospace(task);
697                 break;
698         case -ECONNRESET:
699         case -ECONNREFUSED:
700         case -ENOTCONN:
701         case -EADDRINUSE:
702         case -ENOBUFS:
703         case -EPIPE:
704                 break;
705         default:
706                 dprintk("RPC:       sendmsg returned unrecognized error %d\n",
707                         -status);
708         }
709 
710         return status;
711 }
712 
713 /**
714  * xs_tcp_release_xprt - clean up after a tcp transmission
715  * @xprt: transport
716  * @task: rpc task
717  *
718  * This cleans up if an error causes us to abort the transmission of a request.
719  * In this case, the socket may need to be reset in order to avoid confusing
720  * the server.
721  */
722 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
723 {
724         struct rpc_rqst *req;
725 
726         if (task != xprt->snd_task)
727                 return;
728         if (task == NULL)
729                 goto out_release;
730         req = task->tk_rqstp;
731         if (req == NULL)
732                 goto out_release;
733         if (req->rq_bytes_sent == 0)
734                 goto out_release;
735         if (req->rq_bytes_sent == req->rq_snd_buf.len)
736                 goto out_release;
737         set_bit(XPRT_CLOSE_WAIT, &xprt->state);
738 out_release:
739         xprt_release_xprt(xprt, task);
740 }
741 
742 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
743 {
744         transport->old_data_ready = sk->sk_data_ready;
745         transport->old_state_change = sk->sk_state_change;
746         transport->old_write_space = sk->sk_write_space;
747         transport->old_error_report = sk->sk_error_report;
748 }
749 
750 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
751 {
752         sk->sk_data_ready = transport->old_data_ready;
753         sk->sk_state_change = transport->old_state_change;
754         sk->sk_write_space = transport->old_write_space;
755         sk->sk_error_report = transport->old_error_report;
756 }
757 
758 static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
759 {
760         smp_mb__before_atomic();
761         clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
762         clear_bit(XPRT_CLOSING, &xprt->state);
763         smp_mb__after_atomic();
764 }
765 
766 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
767 {
768         xs_sock_reset_connection_flags(xprt);
769         /* Mark transport as closed and wake up all pending tasks */
770         xprt_disconnect_done(xprt);
771 }
772 
773 /**
774  * xs_error_report - callback to handle TCP socket state errors
775  * @sk: socket
776  *
777  * Note: we don't call sock_error() since there may be a rpc_task
778  * using the socket, and so we don't want to clear sk->sk_err.
779  */
780 static void xs_error_report(struct sock *sk)
781 {
782         struct rpc_xprt *xprt;
783         int err;
784 
785         read_lock_bh(&sk->sk_callback_lock);
786         if (!(xprt = xprt_from_sock(sk)))
787                 goto out;
788 
789         err = -sk->sk_err;
790         if (err == 0)
791                 goto out;
792         /* Is this a reset event? */
793         if (sk->sk_state == TCP_CLOSE)
794                 xs_sock_mark_closed(xprt);
795         dprintk("RPC:       xs_error_report client %p, error=%d...\n",
796                         xprt, -err);
797         trace_rpc_socket_error(xprt, sk->sk_socket, err);
798         xprt_wake_pending_tasks(xprt, err);
799  out:
800         read_unlock_bh(&sk->sk_callback_lock);
801 }
802 
803 static void xs_reset_transport(struct sock_xprt *transport)
804 {
805         struct socket *sock = transport->sock;
806         struct sock *sk = transport->inet;
807         struct rpc_xprt *xprt = &transport->xprt;
808 
809         if (sk == NULL)
810                 return;
811 
812         if (atomic_read(&transport->xprt.swapper))
813                 sk_clear_memalloc(sk);
814 
815         kernel_sock_shutdown(sock, SHUT_RDWR);
816 
817         mutex_lock(&transport->recv_mutex);
818         write_lock_bh(&sk->sk_callback_lock);
819         transport->inet = NULL;
820         transport->sock = NULL;
821 
822         sk->sk_user_data = NULL;
823 
824         xs_restore_old_callbacks(transport, sk);
825         xprt_clear_connected(xprt);
826         write_unlock_bh(&sk->sk_callback_lock);
827         xs_sock_reset_connection_flags(xprt);
828         mutex_unlock(&transport->recv_mutex);
829 
830         trace_rpc_socket_close(xprt, sock);
831         sock_release(sock);
832 }
833 
834 /**
835  * xs_close - close a socket
836  * @xprt: transport
837  *
838  * This is used when all requests are complete; ie, no DRC state remains
839  * on the server we want to save.
840  *
841  * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
842  * xs_reset_transport() zeroing the socket from underneath a writer.
843  */
844 static void xs_close(struct rpc_xprt *xprt)
845 {
846         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
847 
848         dprintk("RPC:       xs_close xprt %p\n", xprt);
849 
850         xs_reset_transport(transport);
851         xprt->reestablish_timeout = 0;
852 
853         xprt_disconnect_done(xprt);
854 }
855 
856 static void xs_inject_disconnect(struct rpc_xprt *xprt)
857 {
858         dprintk("RPC:       injecting transport disconnect on xprt=%p\n",
859                 xprt);
860         xprt_disconnect_done(xprt);
861 }
862 
863 static void xs_xprt_free(struct rpc_xprt *xprt)
864 {
865         xs_free_peer_addresses(xprt);
866         xprt_free(xprt);
867 }
868 
869 /**
870  * xs_destroy - prepare to shutdown a transport
871  * @xprt: doomed transport
872  *
873  */
874 static void xs_destroy(struct rpc_xprt *xprt)
875 {
876         struct sock_xprt *transport = container_of(xprt,
877                         struct sock_xprt, xprt);
878         dprintk("RPC:       xs_destroy xprt %p\n", xprt);
879 
880         cancel_delayed_work_sync(&transport->connect_worker);
881         xs_close(xprt);
882         cancel_work_sync(&transport->recv_worker);
883         xs_xprt_free(xprt);
884         module_put(THIS_MODULE);
885 }
886 
887 static int xs_local_copy_to_xdr(struct xdr_buf *xdr, struct sk_buff *skb)
888 {
889         struct xdr_skb_reader desc = {
890                 .skb            = skb,
891                 .offset         = sizeof(rpc_fraghdr),
892                 .count          = skb->len - sizeof(rpc_fraghdr),
893         };
894 
895         if (xdr_partial_copy_from_skb(xdr, 0, &desc, xdr_skb_read_bits) < 0)
896                 return -1;
897         if (desc.count)
898                 return -1;
899         return 0;
900 }
901 
902 /**
903  * xs_local_data_read_skb
904  * @xprt: transport
905  * @sk: socket
906  * @skb: skbuff
907  *
908  * Currently this assumes we can read the whole reply in a single gulp.
909  */
910 static void xs_local_data_read_skb(struct rpc_xprt *xprt,
911                 struct sock *sk,
912                 struct sk_buff *skb)
913 {
914         struct rpc_task *task;
915         struct rpc_rqst *rovr;
916         int repsize, copied;
917         u32 _xid;
918         __be32 *xp;
919 
920         repsize = skb->len - sizeof(rpc_fraghdr);
921         if (repsize < 4) {
922                 dprintk("RPC:       impossible RPC reply size %d\n", repsize);
923                 return;
924         }
925 
926         /* Copy the XID from the skb... */
927         xp = skb_header_pointer(skb, sizeof(rpc_fraghdr), sizeof(_xid), &_xid);
928         if (xp == NULL)
929                 return;
930 
931         /* Look up and lock the request corresponding to the given XID */
932         spin_lock_bh(&xprt->transport_lock);
933         rovr = xprt_lookup_rqst(xprt, *xp);
934         if (!rovr)
935                 goto out_unlock;
936         task = rovr->rq_task;
937 
938         copied = rovr->rq_private_buf.buflen;
939         if (copied > repsize)
940                 copied = repsize;
941 
942         if (xs_local_copy_to_xdr(&rovr->rq_private_buf, skb)) {
943                 dprintk("RPC:       sk_buff copy failed\n");
944                 goto out_unlock;
945         }
946 
947         xprt_complete_rqst(task, copied);
948 
949  out_unlock:
950         spin_unlock_bh(&xprt->transport_lock);
951 }
952 
953 static void xs_local_data_receive(struct sock_xprt *transport)
954 {
955         struct sk_buff *skb;
956         struct sock *sk;
957         int err;
958 
959         mutex_lock(&transport->recv_mutex);
960         sk = transport->inet;
961         if (sk == NULL)
962                 goto out;
963         for (;;) {
964                 skb = skb_recv_datagram(sk, 0, 1, &err);
965                 if (skb == NULL)
966                         break;
967                 xs_local_data_read_skb(&transport->xprt, sk, skb);
968                 skb_free_datagram(sk, skb);
969         }
970 out:
971         mutex_unlock(&transport->recv_mutex);
972 }
973 
974 static void xs_local_data_receive_workfn(struct work_struct *work)
975 {
976         struct sock_xprt *transport =
977                 container_of(work, struct sock_xprt, recv_worker);
978         xs_local_data_receive(transport);
979 }
980 
981 /**
982  * xs_udp_data_read_skb - receive callback for UDP sockets
983  * @xprt: transport
984  * @sk: socket
985  * @skb: skbuff
986  *
987  */
988 static void xs_udp_data_read_skb(struct rpc_xprt *xprt,
989                 struct sock *sk,
990                 struct sk_buff *skb)
991 {
992         struct rpc_task *task;
993         struct rpc_rqst *rovr;
994         int repsize, copied;
995         u32 _xid;
996         __be32 *xp;
997 
998         repsize = skb->len;
999         if (repsize < 4) {
1000                 dprintk("RPC:       impossible RPC reply size %d!\n", repsize);
1001                 return;
1002         }
1003 
1004         /* Copy the XID from the skb... */
1005         xp = skb_header_pointer(skb, 0, sizeof(_xid), &_xid);
1006         if (xp == NULL)
1007                 return;
1008 
1009         /* Look up and lock the request corresponding to the given XID */
1010         spin_lock_bh(&xprt->transport_lock);
1011         rovr = xprt_lookup_rqst(xprt, *xp);
1012         if (!rovr)
1013                 goto out_unlock;
1014         task = rovr->rq_task;
1015 
1016         if ((copied = rovr->rq_private_buf.buflen) > repsize)
1017                 copied = repsize;
1018 
1019         /* Suck it into the iovec, verify checksum if not done by hw. */
1020         if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
1021                 __UDPX_INC_STATS(sk, UDP_MIB_INERRORS);
1022                 goto out_unlock;
1023         }
1024 
1025         __UDPX_INC_STATS(sk, UDP_MIB_INDATAGRAMS);
1026 
1027         xprt_adjust_cwnd(xprt, task, copied);
1028         xprt_complete_rqst(task, copied);
1029 
1030  out_unlock:
1031         spin_unlock_bh(&xprt->transport_lock);
1032 }
1033 
1034 static void xs_udp_data_receive(struct sock_xprt *transport)
1035 {
1036         struct sk_buff *skb;
1037         struct sock *sk;
1038         int err;
1039 
1040         mutex_lock(&transport->recv_mutex);
1041         sk = transport->inet;
1042         if (sk == NULL)
1043                 goto out;
1044         for (;;) {
1045                 skb = skb_recv_datagram(sk, 0, 1, &err);
1046                 if (skb == NULL)
1047                         break;
1048                 xs_udp_data_read_skb(&transport->xprt, sk, skb);
1049                 skb_free_datagram(sk, skb);
1050         }
1051 out:
1052         mutex_unlock(&transport->recv_mutex);
1053 }
1054 
1055 static void xs_udp_data_receive_workfn(struct work_struct *work)
1056 {
1057         struct sock_xprt *transport =
1058                 container_of(work, struct sock_xprt, recv_worker);
1059         xs_udp_data_receive(transport);
1060 }
1061 
1062 /**
1063  * xs_data_ready - "data ready" callback for UDP sockets
1064  * @sk: socket with data to read
1065  *
1066  */
1067 static void xs_data_ready(struct sock *sk)
1068 {
1069         struct rpc_xprt *xprt;
1070 
1071         read_lock_bh(&sk->sk_callback_lock);
1072         dprintk("RPC:       xs_data_ready...\n");
1073         xprt = xprt_from_sock(sk);
1074         if (xprt != NULL) {
1075                 struct sock_xprt *transport = container_of(xprt,
1076                                 struct sock_xprt, xprt);
1077                 queue_work(rpciod_workqueue, &transport->recv_worker);
1078         }
1079         read_unlock_bh(&sk->sk_callback_lock);
1080 }
1081 
1082 /*
1083  * Helper function to force a TCP close if the server is sending
1084  * junk and/or it has put us in CLOSE_WAIT
1085  */
1086 static void xs_tcp_force_close(struct rpc_xprt *xprt)
1087 {
1088         xprt_force_disconnect(xprt);
1089 }
1090 
1091 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
1092 {
1093         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1094         size_t len, used;
1095         char *p;
1096 
1097         p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
1098         len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
1099         used = xdr_skb_read_bits(desc, p, len);
1100         transport->tcp_offset += used;
1101         if (used != len)
1102                 return;
1103 
1104         transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
1105         if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
1106                 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
1107         else
1108                 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
1109         transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
1110 
1111         transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
1112         transport->tcp_offset = 0;
1113 
1114         /* Sanity check of the record length */
1115         if (unlikely(transport->tcp_reclen < 8)) {
1116                 dprintk("RPC:       invalid TCP record fragment length\n");
1117                 xs_tcp_force_close(xprt);
1118                 return;
1119         }
1120         dprintk("RPC:       reading TCP record fragment of length %d\n",
1121                         transport->tcp_reclen);
1122 }
1123 
1124 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
1125 {
1126         if (transport->tcp_offset == transport->tcp_reclen) {
1127                 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
1128                 transport->tcp_offset = 0;
1129                 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
1130                         transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1131                         transport->tcp_flags |= TCP_RCV_COPY_XID;
1132                         transport->tcp_copied = 0;
1133                 }
1134         }
1135 }
1136 
1137 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1138 {
1139         size_t len, used;
1140         char *p;
1141 
1142         len = sizeof(transport->tcp_xid) - transport->tcp_offset;
1143         dprintk("RPC:       reading XID (%Zu bytes)\n", len);
1144         p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
1145         used = xdr_skb_read_bits(desc, p, len);
1146         transport->tcp_offset += used;
1147         if (used != len)
1148                 return;
1149         transport->tcp_flags &= ~TCP_RCV_COPY_XID;
1150         transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
1151         transport->tcp_copied = 4;
1152         dprintk("RPC:       reading %s XID %08x\n",
1153                         (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
1154                                                               : "request with",
1155                         ntohl(transport->tcp_xid));
1156         xs_tcp_check_fraghdr(transport);
1157 }
1158 
1159 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
1160                                        struct xdr_skb_reader *desc)
1161 {
1162         size_t len, used;
1163         u32 offset;
1164         char *p;
1165 
1166         /*
1167          * We want transport->tcp_offset to be 8 at the end of this routine
1168          * (4 bytes for the xid and 4 bytes for the call/reply flag).
1169          * When this function is called for the first time,
1170          * transport->tcp_offset is 4 (after having already read the xid).
1171          */
1172         offset = transport->tcp_offset - sizeof(transport->tcp_xid);
1173         len = sizeof(transport->tcp_calldir) - offset;
1174         dprintk("RPC:       reading CALL/REPLY flag (%Zu bytes)\n", len);
1175         p = ((char *) &transport->tcp_calldir) + offset;
1176         used = xdr_skb_read_bits(desc, p, len);
1177         transport->tcp_offset += used;
1178         if (used != len)
1179                 return;
1180         transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
1181         /*
1182          * We don't yet have the XDR buffer, so we will write the calldir
1183          * out after we get the buffer from the 'struct rpc_rqst'
1184          */
1185         switch (ntohl(transport->tcp_calldir)) {
1186         case RPC_REPLY:
1187                 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1188                 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1189                 transport->tcp_flags |= TCP_RPC_REPLY;
1190                 break;
1191         case RPC_CALL:
1192                 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
1193                 transport->tcp_flags |= TCP_RCV_COPY_DATA;
1194                 transport->tcp_flags &= ~TCP_RPC_REPLY;
1195                 break;
1196         default:
1197                 dprintk("RPC:       invalid request message type\n");
1198                 xs_tcp_force_close(&transport->xprt);
1199         }
1200         xs_tcp_check_fraghdr(transport);
1201 }
1202 
1203 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
1204                                      struct xdr_skb_reader *desc,
1205                                      struct rpc_rqst *req)
1206 {
1207         struct sock_xprt *transport =
1208                                 container_of(xprt, struct sock_xprt, xprt);
1209         struct xdr_buf *rcvbuf;
1210         size_t len;
1211         ssize_t r;
1212 
1213         rcvbuf = &req->rq_private_buf;
1214 
1215         if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
1216                 /*
1217                  * Save the RPC direction in the XDR buffer
1218                  */
1219                 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1220                         &transport->tcp_calldir,
1221                         sizeof(transport->tcp_calldir));
1222                 transport->tcp_copied += sizeof(transport->tcp_calldir);
1223                 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1224         }
1225 
1226         len = desc->count;
1227         if (len > transport->tcp_reclen - transport->tcp_offset) {
1228                 struct xdr_skb_reader my_desc;
1229 
1230                 len = transport->tcp_reclen - transport->tcp_offset;
1231                 memcpy(&my_desc, desc, sizeof(my_desc));
1232                 my_desc.count = len;
1233                 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1234                                           &my_desc, xdr_skb_read_bits);
1235                 desc->count -= r;
1236                 desc->offset += r;
1237         } else
1238                 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1239                                           desc, xdr_skb_read_bits);
1240 
1241         if (r > 0) {
1242                 transport->tcp_copied += r;
1243                 transport->tcp_offset += r;
1244         }
1245         if (r != len) {
1246                 /* Error when copying to the receive buffer,
1247                  * usually because we weren't able to allocate
1248                  * additional buffer pages. All we can do now
1249                  * is turn off TCP_RCV_COPY_DATA, so the request
1250                  * will not receive any additional updates,
1251                  * and time out.
1252                  * Any remaining data from this record will
1253                  * be discarded.
1254                  */
1255                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1256                 dprintk("RPC:       XID %08x truncated request\n",
1257                                 ntohl(transport->tcp_xid));
1258                 dprintk("RPC:       xprt = %p, tcp_copied = %lu, "
1259                                 "tcp_offset = %u, tcp_reclen = %u\n",
1260                                 xprt, transport->tcp_copied,
1261                                 transport->tcp_offset, transport->tcp_reclen);
1262                 return;
1263         }
1264 
1265         dprintk("RPC:       XID %08x read %Zd bytes\n",
1266                         ntohl(transport->tcp_xid), r);
1267         dprintk("RPC:       xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1268                         "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1269                         transport->tcp_offset, transport->tcp_reclen);
1270 
1271         if (transport->tcp_copied == req->rq_private_buf.buflen)
1272                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1273         else if (transport->tcp_offset == transport->tcp_reclen) {
1274                 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1275                         transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1276         }
1277 }
1278 
1279 /*
1280  * Finds the request corresponding to the RPC xid and invokes the common
1281  * tcp read code to read the data.
1282  */
1283 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1284                                     struct xdr_skb_reader *desc)
1285 {
1286         struct sock_xprt *transport =
1287                                 container_of(xprt, struct sock_xprt, xprt);
1288         struct rpc_rqst *req;
1289 
1290         dprintk("RPC:       read reply XID %08x\n", ntohl(transport->tcp_xid));
1291 
1292         /* Find and lock the request corresponding to this xid */
1293         spin_lock_bh(&xprt->transport_lock);
1294         req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1295         if (!req) {
1296                 dprintk("RPC:       XID %08x request not found!\n",
1297                                 ntohl(transport->tcp_xid));
1298                 spin_unlock_bh(&xprt->transport_lock);
1299                 return -1;
1300         }
1301 
1302         xs_tcp_read_common(xprt, desc, req);
1303 
1304         if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1305                 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1306 
1307         spin_unlock_bh(&xprt->transport_lock);
1308         return 0;
1309 }
1310 
1311 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1312 /*
1313  * Obtains an rpc_rqst previously allocated and invokes the common
1314  * tcp read code to read the data.  The result is placed in the callback
1315  * queue.
1316  * If we're unable to obtain the rpc_rqst we schedule the closing of the
1317  * connection and return -1.
1318  */
1319 static int xs_tcp_read_callback(struct rpc_xprt *xprt,
1320                                        struct xdr_skb_reader *desc)
1321 {
1322         struct sock_xprt *transport =
1323                                 container_of(xprt, struct sock_xprt, xprt);
1324         struct rpc_rqst *req;
1325 
1326         /* Look up and lock the request corresponding to the given XID */
1327         spin_lock_bh(&xprt->transport_lock);
1328         req = xprt_lookup_bc_request(xprt, transport->tcp_xid);
1329         if (req == NULL) {
1330                 spin_unlock_bh(&xprt->transport_lock);
1331                 printk(KERN_WARNING "Callback slot table overflowed\n");
1332                 xprt_force_disconnect(xprt);
1333                 return -1;
1334         }
1335 
1336         dprintk("RPC:       read callback  XID %08x\n", ntohl(req->rq_xid));
1337         xs_tcp_read_common(xprt, desc, req);
1338 
1339         if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1340                 xprt_complete_bc_request(req, transport->tcp_copied);
1341         spin_unlock_bh(&xprt->transport_lock);
1342 
1343         return 0;
1344 }
1345 
1346 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1347                                         struct xdr_skb_reader *desc)
1348 {
1349         struct sock_xprt *transport =
1350                                 container_of(xprt, struct sock_xprt, xprt);
1351 
1352         return (transport->tcp_flags & TCP_RPC_REPLY) ?
1353                 xs_tcp_read_reply(xprt, desc) :
1354                 xs_tcp_read_callback(xprt, desc);
1355 }
1356 
1357 static int xs_tcp_bc_up(struct svc_serv *serv, struct net *net)
1358 {
1359         int ret;
1360 
1361         ret = svc_create_xprt(serv, "tcp-bc", net, PF_INET, 0,
1362                               SVC_SOCK_ANONYMOUS);
1363         if (ret < 0)
1364                 return ret;
1365         return 0;
1366 }
1367 
1368 static size_t xs_tcp_bc_maxpayload(struct rpc_xprt *xprt)
1369 {
1370         return PAGE_SIZE;
1371 }
1372 #else
1373 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1374                                         struct xdr_skb_reader *desc)
1375 {
1376         return xs_tcp_read_reply(xprt, desc);
1377 }
1378 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1379 
1380 /*
1381  * Read data off the transport.  This can be either an RPC_CALL or an
1382  * RPC_REPLY.  Relay the processing to helper functions.
1383  */
1384 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1385                                     struct xdr_skb_reader *desc)
1386 {
1387         struct sock_xprt *transport =
1388                                 container_of(xprt, struct sock_xprt, xprt);
1389 
1390         if (_xs_tcp_read_data(xprt, desc) == 0)
1391                 xs_tcp_check_fraghdr(transport);
1392         else {
1393                 /*
1394                  * The transport_lock protects the request handling.
1395                  * There's no need to hold it to update the tcp_flags.
1396                  */
1397                 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1398         }
1399 }
1400 
1401 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1402 {
1403         size_t len;
1404 
1405         len = transport->tcp_reclen - transport->tcp_offset;
1406         if (len > desc->count)
1407                 len = desc->count;
1408         desc->count -= len;
1409         desc->offset += len;
1410         transport->tcp_offset += len;
1411         dprintk("RPC:       discarded %Zu bytes\n", len);
1412         xs_tcp_check_fraghdr(transport);
1413 }
1414 
1415 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1416 {
1417         struct rpc_xprt *xprt = rd_desc->arg.data;
1418         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1419         struct xdr_skb_reader desc = {
1420                 .skb    = skb,
1421                 .offset = offset,
1422                 .count  = len,
1423         };
1424 
1425         dprintk("RPC:       xs_tcp_data_recv started\n");
1426         do {
1427                 trace_xs_tcp_data_recv(transport);
1428                 /* Read in a new fragment marker if necessary */
1429                 /* Can we ever really expect to get completely empty fragments? */
1430                 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1431                         xs_tcp_read_fraghdr(xprt, &desc);
1432                         continue;
1433                 }
1434                 /* Read in the xid if necessary */
1435                 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1436                         xs_tcp_read_xid(transport, &desc);
1437                         continue;
1438                 }
1439                 /* Read in the call/reply flag */
1440                 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1441                         xs_tcp_read_calldir(transport, &desc);
1442                         continue;
1443                 }
1444                 /* Read in the request data */
1445                 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1446                         xs_tcp_read_data(xprt, &desc);
1447                         continue;
1448                 }
1449                 /* Skip over any trailing bytes on short reads */
1450                 xs_tcp_read_discard(transport, &desc);
1451         } while (desc.count);
1452         trace_xs_tcp_data_recv(transport);
1453         dprintk("RPC:       xs_tcp_data_recv done\n");
1454         return len - desc.count;
1455 }
1456 
1457 static void xs_tcp_data_receive(struct sock_xprt *transport)
1458 {
1459         struct rpc_xprt *xprt = &transport->xprt;
1460         struct sock *sk;
1461         read_descriptor_t rd_desc = {
1462                 .count = 2*1024*1024,
1463                 .arg.data = xprt,
1464         };
1465         unsigned long total = 0;
1466         int read = 0;
1467 
1468         mutex_lock(&transport->recv_mutex);
1469         sk = transport->inet;
1470         if (sk == NULL)
1471                 goto out;
1472 
1473         /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1474         for (;;) {
1475                 lock_sock(sk);
1476                 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1477                 release_sock(sk);
1478                 if (read <= 0)
1479                         break;
1480                 total += read;
1481                 rd_desc.count = 65536;
1482         }
1483 out:
1484         mutex_unlock(&transport->recv_mutex);
1485         trace_xs_tcp_data_ready(xprt, read, total);
1486 }
1487 
1488 static void xs_tcp_data_receive_workfn(struct work_struct *work)
1489 {
1490         struct sock_xprt *transport =
1491                 container_of(work, struct sock_xprt, recv_worker);
1492         xs_tcp_data_receive(transport);
1493 }
1494 
1495 /**
1496  * xs_tcp_data_ready - "data ready" callback for TCP sockets
1497  * @sk: socket with data to read
1498  *
1499  */
1500 static void xs_tcp_data_ready(struct sock *sk)
1501 {
1502         struct sock_xprt *transport;
1503         struct rpc_xprt *xprt;
1504 
1505         dprintk("RPC:       xs_tcp_data_ready...\n");
1506 
1507         read_lock_bh(&sk->sk_callback_lock);
1508         if (!(xprt = xprt_from_sock(sk)))
1509                 goto out;
1510         transport = container_of(xprt, struct sock_xprt, xprt);
1511 
1512         /* Any data means we had a useful conversation, so
1513          * the we don't need to delay the next reconnect
1514          */
1515         if (xprt->reestablish_timeout)
1516                 xprt->reestablish_timeout = 0;
1517         queue_work(rpciod_workqueue, &transport->recv_worker);
1518 
1519 out:
1520         read_unlock_bh(&sk->sk_callback_lock);
1521 }
1522 
1523 /**
1524  * xs_tcp_state_change - callback to handle TCP socket state changes
1525  * @sk: socket whose state has changed
1526  *
1527  */
1528 static void xs_tcp_state_change(struct sock *sk)
1529 {
1530         struct rpc_xprt *xprt;
1531         struct sock_xprt *transport;
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         transport = container_of(xprt, struct sock_xprt, xprt);
1544         trace_rpc_socket_state_change(xprt, sk->sk_socket);
1545         switch (sk->sk_state) {
1546         case TCP_ESTABLISHED:
1547                 spin_lock(&xprt->transport_lock);
1548                 if (!xprt_test_and_set_connected(xprt)) {
1549 
1550                         /* Reset TCP record info */
1551                         transport->tcp_offset = 0;
1552                         transport->tcp_reclen = 0;
1553                         transport->tcp_copied = 0;
1554                         transport->tcp_flags =
1555                                 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1556                         xprt->connect_cookie++;
1557                         clear_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
1558                         xprt_clear_connecting(xprt);
1559 
1560                         xprt_wake_pending_tasks(xprt, -EAGAIN);
1561                 }
1562                 spin_unlock(&xprt->transport_lock);
1563                 break;
1564         case TCP_FIN_WAIT1:
1565                 /* The client initiated a shutdown of the socket */
1566                 xprt->connect_cookie++;
1567                 xprt->reestablish_timeout = 0;
1568                 set_bit(XPRT_CLOSING, &xprt->state);
1569                 smp_mb__before_atomic();
1570                 clear_bit(XPRT_CONNECTED, &xprt->state);
1571                 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1572                 smp_mb__after_atomic();
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                 smp_mb__before_atomic();
1590                 clear_bit(XPRT_CONNECTED, &xprt->state);
1591                 smp_mb__after_atomic();
1592                 break;
1593         case TCP_CLOSE:
1594                 if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
1595                                         &transport->sock_state))
1596                         xprt_clear_connecting(xprt);
1597                 xs_sock_mark_closed(xprt);
1598         }
1599  out:
1600         read_unlock_bh(&sk->sk_callback_lock);
1601 }
1602 
1603 static void xs_write_space(struct sock *sk)
1604 {
1605         struct socket_wq *wq;
1606         struct rpc_xprt *xprt;
1607 
1608         if (!sk->sk_socket)
1609                 return;
1610         clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1611 
1612         if (unlikely(!(xprt = xprt_from_sock(sk))))
1613                 return;
1614         rcu_read_lock();
1615         wq = rcu_dereference(sk->sk_wq);
1616         if (!wq || test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &wq->flags) == 0)
1617                 goto out;
1618 
1619         xprt_write_space(xprt);
1620 out:
1621         rcu_read_unlock();
1622 }
1623 
1624 /**
1625  * xs_udp_write_space - callback invoked when socket buffer space
1626  *                             becomes available
1627  * @sk: socket whose state has changed
1628  *
1629  * Called when more output buffer space is available for this socket.
1630  * We try not to wake our writers until they can make "significant"
1631  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1632  * with a bunch of small requests.
1633  */
1634 static void xs_udp_write_space(struct sock *sk)
1635 {
1636         read_lock_bh(&sk->sk_callback_lock);
1637 
1638         /* from net/core/sock.c:sock_def_write_space */
1639         if (sock_writeable(sk))
1640                 xs_write_space(sk);
1641 
1642         read_unlock_bh(&sk->sk_callback_lock);
1643 }
1644 
1645 /**
1646  * xs_tcp_write_space - callback invoked when socket buffer space
1647  *                             becomes available
1648  * @sk: socket whose state has changed
1649  *
1650  * Called when more output buffer space is available for this socket.
1651  * We try not to wake our writers until they can make "significant"
1652  * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1653  * with a bunch of small requests.
1654  */
1655 static void xs_tcp_write_space(struct sock *sk)
1656 {
1657         read_lock_bh(&sk->sk_callback_lock);
1658 
1659         /* from net/core/stream.c:sk_stream_write_space */
1660         if (sk_stream_is_writeable(sk))
1661                 xs_write_space(sk);
1662 
1663         read_unlock_bh(&sk->sk_callback_lock);
1664 }
1665 
1666 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1667 {
1668         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1669         struct sock *sk = transport->inet;
1670 
1671         if (transport->rcvsize) {
1672                 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1673                 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1674         }
1675         if (transport->sndsize) {
1676                 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1677                 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1678                 sk->sk_write_space(sk);
1679         }
1680 }
1681 
1682 /**
1683  * xs_udp_set_buffer_size - set send and receive limits
1684  * @xprt: generic transport
1685  * @sndsize: requested size of send buffer, in bytes
1686  * @rcvsize: requested size of receive buffer, in bytes
1687  *
1688  * Set socket send and receive buffer size limits.
1689  */
1690 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1691 {
1692         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1693 
1694         transport->sndsize = 0;
1695         if (sndsize)
1696                 transport->sndsize = sndsize + 1024;
1697         transport->rcvsize = 0;
1698         if (rcvsize)
1699                 transport->rcvsize = rcvsize + 1024;
1700 
1701         xs_udp_do_set_buffer_size(xprt);
1702 }
1703 
1704 /**
1705  * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1706  * @task: task that timed out
1707  *
1708  * Adjust the congestion window after a retransmit timeout has occurred.
1709  */
1710 static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
1711 {
1712         xprt_adjust_cwnd(xprt, task, -ETIMEDOUT);
1713 }
1714 
1715 static unsigned short xs_get_random_port(void)
1716 {
1717         unsigned short range = xprt_max_resvport - xprt_min_resvport;
1718         unsigned short rand = (unsigned short) prandom_u32() % range;
1719         return rand + xprt_min_resvport;
1720 }
1721 
1722 /**
1723  * xs_set_reuseaddr_port - set the socket's port and address reuse options
1724  * @sock: socket
1725  *
1726  * Note that this function has to be called on all sockets that share the
1727  * same port, and it must be called before binding.
1728  */
1729 static void xs_sock_set_reuseport(struct socket *sock)
1730 {
1731         int opt = 1;
1732 
1733         kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
1734                         (char *)&opt, sizeof(opt));
1735 }
1736 
1737 static unsigned short xs_sock_getport(struct socket *sock)
1738 {
1739         struct sockaddr_storage buf;
1740         int buflen;
1741         unsigned short port = 0;
1742 
1743         if (kernel_getsockname(sock, (struct sockaddr *)&buf, &buflen) < 0)
1744                 goto out;
1745         switch (buf.ss_family) {
1746         case AF_INET6:
1747                 port = ntohs(((struct sockaddr_in6 *)&buf)->sin6_port);
1748                 break;
1749         case AF_INET:
1750                 port = ntohs(((struct sockaddr_in *)&buf)->sin_port);
1751         }
1752 out:
1753         return port;
1754 }
1755 
1756 /**
1757  * xs_set_port - reset the port number in the remote endpoint address
1758  * @xprt: generic transport
1759  * @port: new port number
1760  *
1761  */
1762 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1763 {
1764         dprintk("RPC:       setting port for xprt %p to %u\n", xprt, port);
1765 
1766         rpc_set_port(xs_addr(xprt), port);
1767         xs_update_peer_port(xprt);
1768 }
1769 
1770 static void xs_set_srcport(struct sock_xprt *transport, struct socket *sock)
1771 {
1772         if (transport->srcport == 0)
1773                 transport->srcport = xs_sock_getport(sock);
1774 }
1775 
1776 static unsigned short xs_get_srcport(struct sock_xprt *transport)
1777 {
1778         unsigned short port = transport->srcport;
1779 
1780         if (port == 0 && transport->xprt.resvport)
1781                 port = xs_get_random_port();
1782         return port;
1783 }
1784 
1785 static unsigned short xs_next_srcport(struct sock_xprt *transport, unsigned short port)
1786 {
1787         if (transport->srcport != 0)
1788                 transport->srcport = 0;
1789         if (!transport->xprt.resvport)
1790                 return 0;
1791         if (port <= xprt_min_resvport || port > xprt_max_resvport)
1792                 return xprt_max_resvport;
1793         return --port;
1794 }
1795 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1796 {
1797         struct sockaddr_storage myaddr;
1798         int err, nloop = 0;
1799         unsigned short port = xs_get_srcport(transport);
1800         unsigned short last;
1801 
1802         /*
1803          * If we are asking for any ephemeral port (i.e. port == 0 &&
1804          * transport->xprt.resvport == 0), don't bind.  Let the local
1805          * port selection happen implicitly when the socket is used
1806          * (for example at connect time).
1807          *
1808          * This ensures that we can continue to establish TCP
1809          * connections even when all local ephemeral ports are already
1810          * a part of some TCP connection.  This makes no difference
1811          * for UDP sockets, but also doens't harm them.
1812          *
1813          * If we're asking for any reserved port (i.e. port == 0 &&
1814          * transport->xprt.resvport == 1) xs_get_srcport above will
1815          * ensure that port is non-zero and we will bind as needed.
1816          */
1817         if (port == 0)
1818                 return 0;
1819 
1820         memcpy(&myaddr, &transport->srcaddr, transport->xprt.addrlen);
1821         do {
1822                 rpc_set_port((struct sockaddr *)&myaddr, port);
1823                 err = kernel_bind(sock, (struct sockaddr *)&myaddr,
1824                                 transport->xprt.addrlen);
1825                 if (err == 0) {
1826                         transport->srcport = port;
1827                         break;
1828                 }
1829                 last = port;
1830                 port = xs_next_srcport(transport, port);
1831                 if (port > last)
1832                         nloop++;
1833         } while (err == -EADDRINUSE && nloop != 2);
1834 
1835         if (myaddr.ss_family == AF_INET)
1836                 dprintk("RPC:       %s %pI4:%u: %s (%d)\n", __func__,
1837                                 &((struct sockaddr_in *)&myaddr)->sin_addr,
1838                                 port, err ? "failed" : "ok", err);
1839         else
1840                 dprintk("RPC:       %s %pI6:%u: %s (%d)\n", __func__,
1841                                 &((struct sockaddr_in6 *)&myaddr)->sin6_addr,
1842                                 port, err ? "failed" : "ok", err);
1843         return err;
1844 }
1845 
1846 /*
1847  * We don't support autobind on AF_LOCAL sockets
1848  */
1849 static void xs_local_rpcbind(struct rpc_task *task)
1850 {
1851         xprt_set_bound(task->tk_xprt);
1852 }
1853 
1854 static void xs_local_set_port(struct rpc_xprt *xprt, unsigned short port)
1855 {
1856 }
1857 
1858 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1859 static struct lock_class_key xs_key[2];
1860 static struct lock_class_key xs_slock_key[2];
1861 
1862 static inline void xs_reclassify_socketu(struct socket *sock)
1863 {
1864         struct sock *sk = sock->sk;
1865 
1866         sock_lock_init_class_and_name(sk, "slock-AF_LOCAL-RPC",
1867                 &xs_slock_key[1], "sk_lock-AF_LOCAL-RPC", &xs_key[1]);
1868 }
1869 
1870 static inline void xs_reclassify_socket4(struct socket *sock)
1871 {
1872         struct sock *sk = sock->sk;
1873 
1874         sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1875                 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1876 }
1877 
1878 static inline void xs_reclassify_socket6(struct socket *sock)
1879 {
1880         struct sock *sk = sock->sk;
1881 
1882         sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1883                 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1884 }
1885 
1886 static inline void xs_reclassify_socket(int family, struct socket *sock)
1887 {
1888         if (WARN_ON_ONCE(!sock_allow_reclassification(sock->sk)))
1889                 return;
1890 
1891         switch (family) {
1892         case AF_LOCAL:
1893                 xs_reclassify_socketu(sock);
1894                 break;
1895         case AF_INET:
1896                 xs_reclassify_socket4(sock);
1897                 break;
1898         case AF_INET6:
1899                 xs_reclassify_socket6(sock);
1900                 break;
1901         }
1902 }
1903 #else
1904 static inline void xs_reclassify_socket(int family, struct socket *sock)
1905 {
1906 }
1907 #endif
1908 
1909 static void xs_dummy_setup_socket(struct work_struct *work)
1910 {
1911 }
1912 
1913 static struct socket *xs_create_sock(struct rpc_xprt *xprt,
1914                 struct sock_xprt *transport, int family, int type,
1915                 int protocol, bool reuseport)
1916 {
1917         struct socket *sock;
1918         int err;
1919 
1920         err = __sock_create(xprt->xprt_net, family, type, protocol, &sock, 1);
1921         if (err < 0) {
1922                 dprintk("RPC:       can't create %d transport socket (%d).\n",
1923                                 protocol, -err);
1924                 goto out;
1925         }
1926         xs_reclassify_socket(family, sock);
1927 
1928         if (reuseport)
1929                 xs_sock_set_reuseport(sock);
1930 
1931         err = xs_bind(transport, sock);
1932         if (err) {
1933                 sock_release(sock);
1934                 goto out;
1935         }
1936 
1937         return sock;
1938 out:
1939         return ERR_PTR(err);
1940 }
1941 
1942 static int xs_local_finish_connecting(struct rpc_xprt *xprt,
1943                                       struct socket *sock)
1944 {
1945         struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
1946                                                                         xprt);
1947 
1948         if (!transport->inet) {
1949                 struct sock *sk = sock->sk;
1950 
1951                 write_lock_bh(&sk->sk_callback_lock);
1952 
1953                 xs_save_old_callbacks(transport, sk);
1954 
1955                 sk->sk_user_data = xprt;
1956                 sk->sk_data_ready = xs_data_ready;
1957                 sk->sk_write_space = xs_udp_write_space;
1958                 sock_set_flag(sk, SOCK_FASYNC);
1959                 sk->sk_error_report = xs_error_report;
1960                 sk->sk_allocation = GFP_NOIO;
1961 
1962                 xprt_clear_connected(xprt);
1963 
1964                 /* Reset to new socket */
1965                 transport->sock = sock;
1966                 transport->inet = sk;
1967 
1968                 write_unlock_bh(&sk->sk_callback_lock);
1969         }
1970 
1971         /* Tell the socket layer to start connecting... */
1972         xprt->stat.connect_count++;
1973         xprt->stat.connect_start = jiffies;
1974         return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, 0);
1975 }
1976 
1977 /**
1978  * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1979  * @transport: socket transport to connect
1980  */
1981 static int xs_local_setup_socket(struct sock_xprt *transport)
1982 {
1983         struct rpc_xprt *xprt = &transport->xprt;
1984         struct socket *sock;
1985         int status = -EIO;
1986 
1987         status = __sock_create(xprt->xprt_net, AF_LOCAL,
1988                                         SOCK_STREAM, 0, &sock, 1);
1989         if (status < 0) {
1990                 dprintk("RPC:       can't create AF_LOCAL "
1991                         "transport socket (%d).\n", -status);
1992                 goto out;
1993         }
1994         xs_reclassify_socket(AF_LOCAL, sock);
1995 
1996         dprintk("RPC:       worker connecting xprt %p via AF_LOCAL to %s\n",
1997                         xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
1998 
1999         status = xs_local_finish_connecting(xprt, sock);
2000         trace_rpc_socket_connect(xprt, sock, status);
2001         switch (status) {
2002         case 0:
2003                 dprintk("RPC:       xprt %p connected to %s\n",
2004                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2005                 xprt_set_connected(xprt);
2006         case -ENOBUFS:
2007                 break;
2008         case -ENOENT:
2009                 dprintk("RPC:       xprt %p: socket %s does not exist\n",
2010                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2011                 break;
2012         case -ECONNREFUSED:
2013                 dprintk("RPC:       xprt %p: connection refused for %s\n",
2014                                 xprt, xprt->address_strings[RPC_DISPLAY_ADDR]);
2015                 break;
2016         default:
2017                 printk(KERN_ERR "%s: unhandled error (%d) connecting to %s\n",
2018                                 __func__, -status,
2019                                 xprt->address_strings[RPC_DISPLAY_ADDR]);
2020         }
2021 
2022 out:
2023         xprt_clear_connecting(xprt);
2024         xprt_wake_pending_tasks(xprt, status);
2025         return status;
2026 }
2027 
2028 static void xs_local_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2029 {
2030         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2031         int ret;
2032 
2033          if (RPC_IS_ASYNC(task)) {
2034                 /*
2035                  * We want the AF_LOCAL connect to be resolved in the
2036                  * filesystem namespace of the process making the rpc
2037                  * call.  Thus we connect synchronously.
2038                  *
2039                  * If we want to support asynchronous AF_LOCAL calls,
2040                  * we'll need to figure out how to pass a namespace to
2041                  * connect.
2042                  */
2043                 rpc_exit(task, -ENOTCONN);
2044                 return;
2045         }
2046         ret = xs_local_setup_socket(transport);
2047         if (ret && !RPC_IS_SOFTCONN(task))
2048                 msleep_interruptible(15000);
2049 }
2050 
2051 #if IS_ENABLED(CONFIG_SUNRPC_SWAP)
2052 /*
2053  * Note that this should be called with XPRT_LOCKED held (or when we otherwise
2054  * know that we have exclusive access to the socket), to guard against
2055  * races with xs_reset_transport.
2056  */
2057 static void xs_set_memalloc(struct rpc_xprt *xprt)
2058 {
2059         struct sock_xprt *transport = container_of(xprt, struct sock_xprt,
2060                         xprt);
2061 
2062         /*
2063          * If there's no sock, then we have nothing to set. The
2064          * reconnecting process will get it for us.
2065          */
2066         if (!transport->inet)
2067                 return;
2068         if (atomic_read(&xprt->swapper))
2069                 sk_set_memalloc(transport->inet);
2070 }
2071 
2072 /**
2073  * xs_enable_swap - Tag this transport as being used for swap.
2074  * @xprt: transport to tag
2075  *
2076  * Take a reference to this transport on behalf of the rpc_clnt, and
2077  * optionally mark it for swapping if it wasn't already.
2078  */
2079 static int
2080 xs_enable_swap(struct rpc_xprt *xprt)
2081 {
2082         struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2083 
2084         if (atomic_inc_return(&xprt->swapper) != 1)
2085                 return 0;
2086         if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2087                 return -ERESTARTSYS;
2088         if (xs->inet)
2089                 sk_set_memalloc(xs->inet);
2090         xprt_release_xprt(xprt, NULL);
2091         return 0;
2092 }
2093 
2094 /**
2095  * xs_disable_swap - Untag this transport as being used for swap.
2096  * @xprt: transport to tag
2097  *
2098  * Drop a "swapper" reference to this xprt on behalf of the rpc_clnt. If the
2099  * swapper refcount goes to 0, untag the socket as a memalloc socket.
2100  */
2101 static void
2102 xs_disable_swap(struct rpc_xprt *xprt)
2103 {
2104         struct sock_xprt *xs = container_of(xprt, struct sock_xprt, xprt);
2105 
2106         if (!atomic_dec_and_test(&xprt->swapper))
2107                 return;
2108         if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE))
2109                 return;
2110         if (xs->inet)
2111                 sk_clear_memalloc(xs->inet);
2112         xprt_release_xprt(xprt, NULL);
2113 }
2114 #else
2115 static void xs_set_memalloc(struct rpc_xprt *xprt)
2116 {
2117 }
2118 
2119 static int
2120 xs_enable_swap(struct rpc_xprt *xprt)
2121 {
2122         return -EINVAL;
2123 }
2124 
2125 static void
2126 xs_disable_swap(struct rpc_xprt *xprt)
2127 {
2128 }
2129 #endif
2130 
2131 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2132 {
2133         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2134 
2135         if (!transport->inet) {
2136                 struct sock *sk = sock->sk;
2137 
2138                 write_lock_bh(&sk->sk_callback_lock);
2139 
2140                 xs_save_old_callbacks(transport, sk);
2141 
2142                 sk->sk_user_data = xprt;
2143                 sk->sk_data_ready = xs_data_ready;
2144                 sk->sk_write_space = xs_udp_write_space;
2145                 sock_set_flag(sk, SOCK_FASYNC);
2146                 sk->sk_allocation = GFP_NOIO;
2147 
2148                 xprt_set_connected(xprt);
2149 
2150                 /* Reset to new socket */
2151                 transport->sock = sock;
2152                 transport->inet = sk;
2153 
2154                 xs_set_memalloc(xprt);
2155 
2156                 write_unlock_bh(&sk->sk_callback_lock);
2157         }
2158         xs_udp_do_set_buffer_size(xprt);
2159 }
2160 
2161 static void xs_udp_setup_socket(struct work_struct *work)
2162 {
2163         struct sock_xprt *transport =
2164                 container_of(work, struct sock_xprt, connect_worker.work);
2165         struct rpc_xprt *xprt = &transport->xprt;
2166         struct socket *sock = transport->sock;
2167         int status = -EIO;
2168 
2169         sock = xs_create_sock(xprt, transport,
2170                         xs_addr(xprt)->sa_family, SOCK_DGRAM,
2171                         IPPROTO_UDP, false);
2172         if (IS_ERR(sock))
2173                 goto out;
2174 
2175         dprintk("RPC:       worker connecting xprt %p via %s to "
2176                                 "%s (port %s)\n", xprt,
2177                         xprt->address_strings[RPC_DISPLAY_PROTO],
2178                         xprt->address_strings[RPC_DISPLAY_ADDR],
2179                         xprt->address_strings[RPC_DISPLAY_PORT]);
2180 
2181         xs_udp_finish_connecting(xprt, sock);
2182         trace_rpc_socket_connect(xprt, sock, 0);
2183         status = 0;
2184 out:
2185         xprt_unlock_connect(xprt, transport);
2186         xprt_clear_connecting(xprt);
2187         xprt_wake_pending_tasks(xprt, status);
2188 }
2189 
2190 /**
2191  * xs_tcp_shutdown - gracefully shut down a TCP socket
2192  * @xprt: transport
2193  *
2194  * Initiates a graceful shutdown of the TCP socket by calling the
2195  * equivalent of shutdown(SHUT_RDWR);
2196  */
2197 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
2198 {
2199         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2200         struct socket *sock = transport->sock;
2201 
2202         if (sock == NULL)
2203                 return;
2204         if (xprt_connected(xprt)) {
2205                 kernel_sock_shutdown(sock, SHUT_RDWR);
2206                 trace_rpc_socket_shutdown(xprt, sock);
2207         } else
2208                 xs_reset_transport(transport);
2209 }
2210 
2211 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
2212 {
2213         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2214         int ret = -ENOTCONN;
2215 
2216         if (!transport->inet) {
2217                 struct sock *sk = sock->sk;
2218                 unsigned int keepidle = xprt->timeout->to_initval / HZ;
2219                 unsigned int keepcnt = xprt->timeout->to_retries + 1;
2220                 unsigned int opt_on = 1;
2221                 unsigned int timeo;
2222 
2223                 /* TCP Keepalive options */
2224                 kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
2225                                 (char *)&opt_on, sizeof(opt_on));
2226                 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPIDLE,
2227                                 (char *)&keepidle, sizeof(keepidle));
2228                 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPINTVL,
2229                                 (char *)&keepidle, sizeof(keepidle));
2230                 kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT,
2231                                 (char *)&keepcnt, sizeof(keepcnt));
2232 
2233                 /* TCP user timeout (see RFC5482) */
2234                 timeo = jiffies_to_msecs(xprt->timeout->to_initval) *
2235                         (xprt->timeout->to_retries + 1);
2236                 kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT,
2237                                 (char *)&timeo, sizeof(timeo));
2238 
2239                 write_lock_bh(&sk->sk_callback_lock);
2240 
2241                 xs_save_old_callbacks(transport, sk);
2242 
2243                 sk->sk_user_data = xprt;
2244                 sk->sk_data_ready = xs_tcp_data_ready;
2245                 sk->sk_state_change = xs_tcp_state_change;
2246                 sk->sk_write_space = xs_tcp_write_space;
2247                 sock_set_flag(sk, SOCK_FASYNC);
2248                 sk->sk_error_report = xs_error_report;
2249                 sk->sk_allocation = GFP_NOIO;
2250 
2251                 /* socket options */
2252                 sock_reset_flag(sk, SOCK_LINGER);
2253                 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
2254 
2255                 xprt_clear_connected(xprt);
2256 
2257                 /* Reset to new socket */
2258                 transport->sock = sock;
2259                 transport->inet = sk;
2260 
2261                 write_unlock_bh(&sk->sk_callback_lock);
2262         }
2263 
2264         if (!xprt_bound(xprt))
2265                 goto out;
2266 
2267         xs_set_memalloc(xprt);
2268 
2269         /* Tell the socket layer to start connecting... */
2270         xprt->stat.connect_count++;
2271         xprt->stat.connect_start = jiffies;
2272         set_bit(XPRT_SOCK_CONNECTING, &transport->sock_state);
2273         ret = kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
2274         switch (ret) {
2275         case 0:
2276                 xs_set_srcport(transport, sock);
2277         case -EINPROGRESS:
2278                 /* SYN_SENT! */
2279                 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2280                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2281                 break;
2282         case -EADDRNOTAVAIL:
2283                 /* Source port number is unavailable. Try a new one! */
2284                 transport->srcport = 0;
2285         }
2286 out:
2287         return ret;
2288 }
2289 
2290 /**
2291  * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2292  *
2293  * Invoked by a work queue tasklet.
2294  */
2295 static void xs_tcp_setup_socket(struct work_struct *work)
2296 {
2297         struct sock_xprt *transport =
2298                 container_of(work, struct sock_xprt, connect_worker.work);
2299         struct socket *sock = transport->sock;
2300         struct rpc_xprt *xprt = &transport->xprt;
2301         int status = -EIO;
2302 
2303         if (!sock) {
2304                 sock = xs_create_sock(xprt, transport,
2305                                 xs_addr(xprt)->sa_family, SOCK_STREAM,
2306                                 IPPROTO_TCP, true);
2307                 if (IS_ERR(sock)) {
2308                         status = PTR_ERR(sock);
2309                         goto out;
2310                 }
2311         }
2312 
2313         dprintk("RPC:       worker connecting xprt %p via %s to "
2314                                 "%s (port %s)\n", xprt,
2315                         xprt->address_strings[RPC_DISPLAY_PROTO],
2316                         xprt->address_strings[RPC_DISPLAY_ADDR],
2317                         xprt->address_strings[RPC_DISPLAY_PORT]);
2318 
2319         status = xs_tcp_finish_connecting(xprt, sock);
2320         trace_rpc_socket_connect(xprt, sock, status);
2321         dprintk("RPC:       %p connect status %d connected %d sock state %d\n",
2322                         xprt, -status, xprt_connected(xprt),
2323                         sock->sk->sk_state);
2324         switch (status) {
2325         default:
2326                 printk("%s: connect returned unhandled error %d\n",
2327                         __func__, status);
2328         case -EADDRNOTAVAIL:
2329                 /* We're probably in TIME_WAIT. Get rid of existing socket,
2330                  * and retry
2331                  */
2332                 xs_tcp_force_close(xprt);
2333                 break;
2334         case 0:
2335         case -EINPROGRESS:
2336         case -EALREADY:
2337                 xprt_unlock_connect(xprt, transport);
2338                 return;
2339         case -EINVAL:
2340                 /* Happens, for instance, if the user specified a link
2341                  * local IPv6 address without a scope-id.
2342                  */
2343         case -ECONNREFUSED:
2344         case -ECONNRESET:
2345         case -ENETUNREACH:
2346         case -EADDRINUSE:
2347         case -ENOBUFS:
2348                 /* retry with existing socket, after a delay */
2349                 xs_tcp_force_close(xprt);
2350                 goto out;
2351         }
2352         status = -EAGAIN;
2353 out:
2354         xprt_unlock_connect(xprt, transport);
2355         xprt_clear_connecting(xprt);
2356         xprt_wake_pending_tasks(xprt, status);
2357 }
2358 
2359 /**
2360  * xs_connect - connect a socket to a remote endpoint
2361  * @xprt: pointer to transport structure
2362  * @task: address of RPC task that manages state of connect request
2363  *
2364  * TCP: If the remote end dropped the connection, delay reconnecting.
2365  *
2366  * UDP socket connects are synchronous, but we use a work queue anyway
2367  * to guarantee that even unprivileged user processes can set up a
2368  * socket on a privileged port.
2369  *
2370  * If a UDP socket connect fails, the delay behavior here prevents
2371  * retry floods (hard mounts).
2372  */
2373 static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
2374 {
2375         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2376 
2377         WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
2378 
2379         if (transport->sock != NULL) {
2380                 dprintk("RPC:       xs_connect delayed xprt %p for %lu "
2381                                 "seconds\n",
2382                                 xprt, xprt->reestablish_timeout / HZ);
2383 
2384                 /* Start by resetting any existing state */
2385                 xs_reset_transport(transport);
2386 
2387                 queue_delayed_work(rpciod_workqueue,
2388                                    &transport->connect_worker,
2389                                    xprt->reestablish_timeout);
2390                 xprt->reestablish_timeout <<= 1;
2391                 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2392                         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2393                 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2394                         xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2395         } else {
2396                 dprintk("RPC:       xs_connect scheduled xprt %p\n", xprt);
2397                 queue_delayed_work(rpciod_workqueue,
2398                                    &transport->connect_worker, 0);
2399         }
2400 }
2401 
2402 /**
2403  * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2404  * @xprt: rpc_xprt struct containing statistics
2405  * @seq: output file
2406  *
2407  */
2408 static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2409 {
2410         long idle_time = 0;
2411 
2412         if (xprt_connected(xprt))
2413                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2414 
2415         seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2416                         "%llu %llu %lu %llu %llu\n",
2417                         xprt->stat.bind_count,
2418                         xprt->stat.connect_count,
2419                         xprt->stat.connect_time,
2420                         idle_time,
2421                         xprt->stat.sends,
2422                         xprt->stat.recvs,
2423                         xprt->stat.bad_xids,
2424                         xprt->stat.req_u,
2425                         xprt->stat.bklog_u,
2426                         xprt->stat.max_slots,
2427                         xprt->stat.sending_u,
2428                         xprt->stat.pending_u);
2429 }
2430 
2431 /**
2432  * xs_udp_print_stats - display UDP socket-specifc stats
2433  * @xprt: rpc_xprt struct containing statistics
2434  * @seq: output file
2435  *
2436  */
2437 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2438 {
2439         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2440 
2441         seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2442                         "%lu %llu %llu\n",
2443                         transport->srcport,
2444                         xprt->stat.bind_count,
2445                         xprt->stat.sends,
2446                         xprt->stat.recvs,
2447                         xprt->stat.bad_xids,
2448                         xprt->stat.req_u,
2449                         xprt->stat.bklog_u,
2450                         xprt->stat.max_slots,
2451                         xprt->stat.sending_u,
2452                         xprt->stat.pending_u);
2453 }
2454 
2455 /**
2456  * xs_tcp_print_stats - display TCP socket-specifc stats
2457  * @xprt: rpc_xprt struct containing statistics
2458  * @seq: output file
2459  *
2460  */
2461 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2462 {
2463         struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2464         long idle_time = 0;
2465 
2466         if (xprt_connected(xprt))
2467                 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2468 
2469         seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2470                         "%llu %llu %lu %llu %llu\n",
2471                         transport->srcport,
2472                         xprt->stat.bind_count,
2473                         xprt->stat.connect_count,
2474                         xprt->stat.connect_time,
2475                         idle_time,
2476                         xprt->stat.sends,
2477                         xprt->stat.recvs,
2478                         xprt->stat.bad_xids,
2479                         xprt->stat.req_u,
2480                         xprt->stat.bklog_u,
2481                         xprt->stat.max_slots,
2482                         xprt->stat.sending_u,
2483                         xprt->stat.pending_u);
2484 }
2485 
2486 /*
2487  * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2488  * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2489  * to use the server side send routines.
2490  */
2491 static void *bc_malloc(struct rpc_task *task, size_t size)
2492 {
2493         struct page *page;
2494         struct rpc_buffer *buf;
2495 
2496         WARN_ON_ONCE(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2497         if (size > PAGE_SIZE - sizeof(struct rpc_buffer))
2498                 return NULL;
2499 
2500         page = alloc_page(GFP_KERNEL);
2501         if (!page)
2502                 return NULL;
2503 
2504         buf = page_address(page);
2505         buf->len = PAGE_SIZE;
2506 
2507         return buf->data;
2508 }
2509 
2510 /*
2511  * Free the space allocated in the bc_alloc routine
2512  */
2513 static void bc_free(void *buffer)
2514 {
2515         struct rpc_buffer *buf;
2516 
2517         if (!buffer)
2518                 return;
2519 
2520         buf = container_of(buffer, struct rpc_buffer, data);
2521         free_page((unsigned long)buf);
2522 }
2523 
2524 /*
2525  * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2526  * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2527  */
2528 static int bc_sendto(struct rpc_rqst *req)
2529 {
2530         int len;
2531         struct xdr_buf *xbufp = &req->rq_snd_buf;
2532         struct rpc_xprt *xprt = req->rq_xprt;
2533         struct sock_xprt *transport =
2534                                 container_of(xprt, struct sock_xprt, xprt);
2535         struct socket *sock = transport->sock;
2536         unsigned long headoff;
2537         unsigned long tailoff;
2538 
2539         xs_encode_stream_record_marker(xbufp);
2540 
2541         tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2542         headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2543         len = svc_send_common(sock, xbufp,
2544                               virt_to_page(xbufp->head[0].iov_base), headoff,
2545                               xbufp->tail[0].iov_base, tailoff);
2546 
2547         if (len != xbufp->len) {
2548                 printk(KERN_NOTICE "Error sending entire callback!\n");
2549                 len = -EAGAIN;
2550         }
2551 
2552         return len;
2553 }
2554 
2555 /*
2556  * The send routine. Borrows from svc_send
2557  */
2558 static int bc_send_request(struct rpc_task *task)
2559 {
2560         struct rpc_rqst *req = task->tk_rqstp;
2561         struct svc_xprt *xprt;
2562         int len;
2563 
2564         dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2565         /*
2566          * Get the server socket associated with this callback xprt
2567          */
2568         xprt = req->rq_xprt->bc_xprt;
2569 
2570         /*
2571          * Grab the mutex to serialize data as the connection is shared
2572          * with the fore channel
2573          */
2574         if (!mutex_trylock(&xprt->xpt_mutex)) {
2575                 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2576                 if (!mutex_trylock(&xprt->xpt_mutex))
2577                         return -EAGAIN;
2578                 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2579         }
2580         if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2581                 len = -ENOTCONN;
2582         else
2583                 len = bc_sendto(req);
2584         mutex_unlock(&xprt->xpt_mutex);
2585 
2586         if (len > 0)
2587                 len = 0;
2588 
2589         return len;
2590 }
2591 
2592 /*
2593  * The close routine. Since this is client initiated, we do nothing
2594  */
2595 
2596 static void bc_close(struct rpc_xprt *xprt)
2597 {
2598 }
2599 
2600 /*
2601  * The xprt destroy routine. Again, because this connection is client
2602  * initiated, we do nothing
2603  */
2604 
2605 static void bc_destroy(struct rpc_xprt *xprt)
2606 {
2607         dprintk("RPC:       bc_destroy xprt %p\n", xprt);
2608 
2609         xs_xprt_free(xprt);
2610         module_put(THIS_MODULE);
2611 }
2612 
2613 static struct rpc_xprt_ops xs_local_ops = {
2614         .reserve_xprt           = xprt_reserve_xprt,
2615         .release_xprt           = xs_tcp_release_xprt,
2616         .alloc_slot             = xprt_alloc_slot,
2617         .rpcbind                = xs_local_rpcbind,
2618         .set_port               = xs_local_set_port,
2619         .connect                = xs_local_connect,
2620         .buf_alloc              = rpc_malloc,
2621         .buf_free               = rpc_free,
2622         .send_request           = xs_local_send_request,
2623         .set_retrans_timeout    = xprt_set_retrans_timeout_def,
2624         .close                  = xs_close,
2625         .destroy                = xs_destroy,
2626         .print_stats            = xs_local_print_stats,
2627         .enable_swap            = xs_enable_swap,
2628         .disable_swap           = xs_disable_swap,
2629 };
2630 
2631 static struct rpc_xprt_ops xs_udp_ops = {
2632         .set_buffer_size        = xs_udp_set_buffer_size,
2633         .reserve_xprt           = xprt_reserve_xprt_cong,
2634         .release_xprt           = xprt_release_xprt_cong,
2635         .alloc_slot             = xprt_alloc_slot,
2636         .rpcbind                = rpcb_getport_async,
2637         .set_port               = xs_set_port,
2638         .connect                = xs_connect,
2639         .buf_alloc              = rpc_malloc,
2640         .buf_free               = rpc_free,
2641         .send_request           = xs_udp_send_request,
2642         .set_retrans_timeout    = xprt_set_retrans_timeout_rtt,
2643         .timer                  = xs_udp_timer,
2644         .release_request        = xprt_release_rqst_cong,
2645         .close                  = xs_close,
2646         .destroy                = xs_destroy,
2647         .print_stats            = xs_udp_print_stats,
2648         .enable_swap            = xs_enable_swap,
2649         .disable_swap           = xs_disable_swap,
2650         .inject_disconnect      = xs_inject_disconnect,
2651 };
2652 
2653 static struct rpc_xprt_ops xs_tcp_ops = {
2654         .reserve_xprt           = xprt_reserve_xprt,
2655         .release_xprt           = xs_tcp_release_xprt,
2656         .alloc_slot             = xprt_lock_and_alloc_slot,
2657         .rpcbind                = rpcb_getport_async,
2658         .set_port               = xs_set_port,
2659         .connect                = xs_connect,
2660         .buf_alloc              = rpc_malloc,
2661         .buf_free               = rpc_free,
2662         .send_request           = xs_tcp_send_request,
2663         .set_retrans_timeout    = xprt_set_retrans_timeout_def,
2664         .close                  = xs_tcp_shutdown,
2665         .destroy                = xs_destroy,
2666         .print_stats            = xs_tcp_print_stats,
2667         .enable_swap            = xs_enable_swap,
2668         .disable_swap           = xs_disable_swap,
2669         .inject_disconnect      = xs_inject_disconnect,
2670 #ifdef CONFIG_SUNRPC_BACKCHANNEL
2671         .bc_setup               = xprt_setup_bc,
2672         .bc_up                  = xs_tcp_bc_up,
2673         .bc_maxpayload          = xs_tcp_bc_maxpayload,
2674         .bc_free_rqst           = xprt_free_bc_rqst,
2675         .bc_destroy             = xprt_destroy_bc,
2676 #endif
2677 };
2678 
2679 /*
2680  * The rpc_xprt_ops for the server backchannel
2681  */
2682 
2683 static struct rpc_xprt_ops bc_tcp_ops = {
2684         .reserve_xprt           = xprt_reserve_xprt,
2685         .release_xprt           = xprt_release_xprt,
2686         .alloc_slot             = xprt_alloc_slot,
2687         .buf_alloc              = bc_malloc,
2688         .buf_free               = bc_free,
2689         .send_request           = bc_send_request,
2690         .set_retrans_timeout    = xprt_set_retrans_timeout_def,
2691         .close                  = bc_close,
2692         .destroy                = bc_destroy,
2693         .print_stats            = xs_tcp_print_stats,
2694         .enable_swap            = xs_enable_swap,
2695         .disable_swap           = xs_disable_swap,
2696         .inject_disconnect      = xs_inject_disconnect,
2697 };
2698 
2699 static int xs_init_anyaddr(const int family, struct sockaddr *sap)
2700 {
2701         static const struct sockaddr_in sin = {
2702                 .sin_family             = AF_INET,
2703                 .sin_addr.s_addr        = htonl(INADDR_ANY),
2704         };
2705         static const struct sockaddr_in6 sin6 = {
2706                 .sin6_family            = AF_INET6,
2707                 .sin6_addr              = IN6ADDR_ANY_INIT,
2708         };
2709 
2710         switch (family) {
2711         case AF_LOCAL:
2712                 break;
2713         case AF_INET:
2714                 memcpy(sap, &sin, sizeof(sin));
2715                 break;
2716         case AF_INET6:
2717                 memcpy(sap, &sin6, sizeof(sin6));
2718                 break;
2719         default:
2720                 dprintk("RPC:       %s: Bad address family\n", __func__);
2721                 return -EAFNOSUPPORT;
2722         }
2723         return 0;
2724 }
2725 
2726 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2727                                       unsigned int slot_table_size,
2728                                       unsigned int max_slot_table_size)
2729 {
2730         struct rpc_xprt *xprt;
2731         struct sock_xprt *new;
2732 
2733         if (args->addrlen > sizeof(xprt->addr)) {
2734                 dprintk("RPC:       xs_setup_xprt: address too large\n");
2735                 return ERR_PTR(-EBADF);
2736         }
2737 
2738         xprt = xprt_alloc(args->net, sizeof(*new), slot_table_size,
2739                         max_slot_table_size);
2740         if (xprt == NULL) {
2741                 dprintk("RPC:       xs_setup_xprt: couldn't allocate "
2742                                 "rpc_xprt\n");
2743                 return ERR_PTR(-ENOMEM);
2744         }
2745 
2746         new = container_of(xprt, struct sock_xprt, xprt);
2747         mutex_init(&new->recv_mutex);
2748         memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2749         xprt->addrlen = args->addrlen;
2750         if (args->srcaddr)
2751                 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2752         else {
2753                 int err;
2754                 err = xs_init_anyaddr(args->dstaddr->sa_family,
2755                                         (struct sockaddr *)&new->srcaddr);
2756                 if (err != 0) {
2757                         xprt_free(xprt);
2758                         return ERR_PTR(err);
2759                 }
2760         }
2761 
2762         return xprt;
2763 }
2764 
2765 static const struct rpc_timeout xs_local_default_timeout = {
2766         .to_initval = 10 * HZ,
2767         .to_maxval = 10 * HZ,
2768         .to_retries = 2,
2769 };
2770 
2771 /**
2772  * xs_setup_local - Set up transport to use an AF_LOCAL socket
2773  * @args: rpc transport creation arguments
2774  *
2775  * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2776  */
2777 static struct rpc_xprt *xs_setup_local(struct xprt_create *args)
2778 {
2779         struct sockaddr_un *sun = (struct sockaddr_un *)args->dstaddr;
2780         struct sock_xprt *transport;
2781         struct rpc_xprt *xprt;
2782         struct rpc_xprt *ret;
2783 
2784         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2785                         xprt_max_tcp_slot_table_entries);
2786         if (IS_ERR(xprt))
2787                 return xprt;
2788         transport = container_of(xprt, struct sock_xprt, xprt);
2789 
2790         xprt->prot = 0;
2791         xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2792         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2793 
2794         xprt->bind_timeout = XS_BIND_TO;
2795         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2796         xprt->idle_timeout = XS_IDLE_DISC_TO;
2797 
2798         xprt->ops = &xs_local_ops;
2799         xprt->timeout = &xs_local_default_timeout;
2800 
2801         INIT_WORK(&transport->recv_worker, xs_local_data_receive_workfn);
2802         INIT_DELAYED_WORK(&transport->connect_worker,
2803                         xs_dummy_setup_socket);
2804 
2805         switch (sun->sun_family) {
2806         case AF_LOCAL:
2807                 if (sun->sun_path[0] != '/') {
2808                         dprintk("RPC:       bad AF_LOCAL address: %s\n",
2809                                         sun->sun_path);
2810                         ret = ERR_PTR(-EINVAL);
2811                         goto out_err;
2812                 }
2813                 xprt_set_bound(xprt);
2814                 xs_format_peer_addresses(xprt, "local", RPCBIND_NETID_LOCAL);
2815                 ret = ERR_PTR(xs_local_setup_socket(transport));
2816                 if (ret)
2817                         goto out_err;
2818                 break;
2819         default:
2820                 ret = ERR_PTR(-EAFNOSUPPORT);
2821                 goto out_err;
2822         }
2823 
2824         dprintk("RPC:       set up xprt to %s via AF_LOCAL\n",
2825                         xprt->address_strings[RPC_DISPLAY_ADDR]);
2826 
2827         if (try_module_get(THIS_MODULE))
2828                 return xprt;
2829         ret = ERR_PTR(-EINVAL);
2830 out_err:
2831         xs_xprt_free(xprt);
2832         return ret;
2833 }
2834 
2835 static const struct rpc_timeout xs_udp_default_timeout = {
2836         .to_initval = 5 * HZ,
2837         .to_maxval = 30 * HZ,
2838         .to_increment = 5 * HZ,
2839         .to_retries = 5,
2840 };
2841 
2842 /**
2843  * xs_setup_udp - Set up transport to use a UDP socket
2844  * @args: rpc transport creation arguments
2845  *
2846  */
2847 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2848 {
2849         struct sockaddr *addr = args->dstaddr;
2850         struct rpc_xprt *xprt;
2851         struct sock_xprt *transport;
2852         struct rpc_xprt *ret;
2853 
2854         xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries,
2855                         xprt_udp_slot_table_entries);
2856         if (IS_ERR(xprt))
2857                 return xprt;
2858         transport = container_of(xprt, struct sock_xprt, xprt);
2859 
2860         xprt->prot = IPPROTO_UDP;
2861         xprt->tsh_size = 0;
2862         /* XXX: header size can vary due to auth type, IPv6, etc. */
2863         xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2864 
2865         xprt->bind_timeout = XS_BIND_TO;
2866         xprt->reestablish_timeout = XS_UDP_REEST_TO;
2867         xprt->idle_timeout = XS_IDLE_DISC_TO;
2868 
2869         xprt->ops = &xs_udp_ops;
2870 
2871         xprt->timeout = &xs_udp_default_timeout;
2872 
2873         INIT_WORK(&transport->recv_worker, xs_udp_data_receive_workfn);
2874         INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_setup_socket);
2875 
2876         switch (addr->sa_family) {
2877         case AF_INET:
2878                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2879                         xprt_set_bound(xprt);
2880 
2881                 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2882                 break;
2883         case AF_INET6:
2884                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2885                         xprt_set_bound(xprt);
2886 
2887                 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
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         if (try_module_get(THIS_MODULE))
2905                 return xprt;
2906         ret = ERR_PTR(-EINVAL);
2907 out_err:
2908         xs_xprt_free(xprt);
2909         return ret;
2910 }
2911 
2912 static const struct rpc_timeout xs_tcp_default_timeout = {
2913         .to_initval = 60 * HZ,
2914         .to_maxval = 60 * HZ,
2915         .to_retries = 2,
2916 };
2917 
2918 /**
2919  * xs_setup_tcp - Set up transport to use a TCP socket
2920  * @args: rpc transport creation arguments
2921  *
2922  */
2923 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2924 {
2925         struct sockaddr *addr = args->dstaddr;
2926         struct rpc_xprt *xprt;
2927         struct sock_xprt *transport;
2928         struct rpc_xprt *ret;
2929         unsigned int max_slot_table_size = xprt_max_tcp_slot_table_entries;
2930 
2931         if (args->flags & XPRT_CREATE_INFINITE_SLOTS)
2932                 max_slot_table_size = RPC_MAX_SLOT_TABLE_LIMIT;
2933 
2934         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
2935                         max_slot_table_size);
2936         if (IS_ERR(xprt))
2937                 return xprt;
2938         transport = container_of(xprt, struct sock_xprt, xprt);
2939 
2940         xprt->prot = IPPROTO_TCP;
2941         xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2942         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2943 
2944         xprt->bind_timeout = XS_BIND_TO;
2945         xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2946         xprt->idle_timeout = XS_IDLE_DISC_TO;
2947 
2948         xprt->ops = &xs_tcp_ops;
2949         xprt->timeout = &xs_tcp_default_timeout;
2950 
2951         INIT_WORK(&transport->recv_worker, xs_tcp_data_receive_workfn);
2952         INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_setup_socket);
2953 
2954         switch (addr->sa_family) {
2955         case AF_INET:
2956                 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2957                         xprt_set_bound(xprt);
2958 
2959                 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2960                 break;
2961         case AF_INET6:
2962                 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2963                         xprt_set_bound(xprt);
2964 
2965                 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2966                 break;
2967         default:
2968                 ret = ERR_PTR(-EAFNOSUPPORT);
2969                 goto out_err;
2970         }
2971 
2972         if (xprt_bound(xprt))
2973                 dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
2974                                 xprt->address_strings[RPC_DISPLAY_ADDR],
2975                                 xprt->address_strings[RPC_DISPLAY_PORT],
2976                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
2977         else
2978                 dprintk("RPC:       set up xprt to %s (autobind) via %s\n",
2979                                 xprt->address_strings[RPC_DISPLAY_ADDR],
2980                                 xprt->address_strings[RPC_DISPLAY_PROTO]);
2981 
2982         if (try_module_get(THIS_MODULE))
2983                 return xprt;
2984         ret = ERR_PTR(-EINVAL);
2985 out_err:
2986         xs_xprt_free(xprt);
2987         return ret;
2988 }
2989 
2990 /**
2991  * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2992  * @args: rpc transport creation arguments
2993  *
2994  */
2995 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2996 {
2997         struct sockaddr *addr = args->dstaddr;
2998         struct rpc_xprt *xprt;
2999         struct sock_xprt *transport;
3000         struct svc_sock *bc_sock;
3001         struct rpc_xprt *ret;
3002 
3003         xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries,
3004                         xprt_tcp_slot_table_entries);
3005         if (IS_ERR(xprt))
3006                 return xprt;
3007         transport = container_of(xprt, struct sock_xprt, xprt);
3008 
3009         xprt->prot = IPPROTO_TCP;
3010         xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
3011         xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
3012         xprt->timeout = &xs_tcp_default_timeout;
3013 
3014         /* backchannel */
3015         xprt_set_bound(xprt);
3016         xprt->bind_timeout = 0;
3017         xprt->reestablish_timeout = 0;
3018         xprt->idle_timeout = 0;
3019 
3020         xprt->ops = &bc_tcp_ops;
3021 
3022         switch (addr->sa_family) {
3023         case AF_INET:
3024                 xs_format_peer_addresses(xprt, "tcp",
3025                                          RPCBIND_NETID_TCP);
3026                 break;
3027         case AF_INET6:
3028                 xs_format_peer_addresses(xprt, "tcp",
3029                                    RPCBIND_NETID_TCP6);
3030                 break;
3031         default:
3032                 ret = ERR_PTR(-EAFNOSUPPORT);
3033                 goto out_err;
3034         }
3035 
3036         dprintk("RPC:       set up xprt to %s (port %s) via %s\n",
3037                         xprt->address_strings[RPC_DISPLAY_ADDR],
3038                         xprt->address_strings[RPC_DISPLAY_PORT],
3039                         xprt->address_strings[RPC_DISPLAY_PROTO]);
3040 
3041         /*
3042          * Once we've associated a backchannel xprt with a connection,
3043          * we want to keep it around as long as the connection lasts,
3044          * in case we need to start using it for a backchannel again;
3045          * this reference won't be dropped until bc_xprt is destroyed.
3046          */
3047         xprt_get(xprt);
3048         args->bc_xprt->xpt_bc_xprt = xprt;
3049         xprt->bc_xprt = args->bc_xprt;
3050         bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
3051         transport->sock = bc_sock->sk_sock;
3052         transport->inet = bc_sock->sk_sk;
3053 
3054         /*
3055          * Since we don't want connections for the backchannel, we set
3056          * the xprt status to connected
3057          */
3058         xprt_set_connected(xprt);
3059 
3060         if (try_module_get(THIS_MODULE))
3061                 return xprt;
3062 
3063         args->bc_xprt->xpt_bc_xprt = NULL;
3064         args->bc_xprt->xpt_bc_xps = NULL;
3065         xprt_put(xprt);
3066         ret = ERR_PTR(-EINVAL);
3067 out_err:
3068         xs_xprt_free(xprt);
3069         return ret;
3070 }
3071 
3072 static struct xprt_class        xs_local_transport = {
3073         .list           = LIST_HEAD_INIT(xs_local_transport.list),
3074         .name           = "named UNIX socket",
3075         .owner          = THIS_MODULE,
3076         .ident          = XPRT_TRANSPORT_LOCAL,
3077         .setup          = xs_setup_local,
3078 };
3079 
3080 static struct xprt_class        xs_udp_transport = {
3081         .list           = LIST_HEAD_INIT(xs_udp_transport.list),
3082         .name           = "udp",
3083         .owner          = THIS_MODULE,
3084         .ident          = XPRT_TRANSPORT_UDP,
3085         .setup          = xs_setup_udp,
3086 };
3087 
3088 static struct xprt_class        xs_tcp_transport = {
3089         .list           = LIST_HEAD_INIT(xs_tcp_transport.list),
3090         .name           = "tcp",
3091         .owner          = THIS_MODULE,
3092         .ident          = XPRT_TRANSPORT_TCP,
3093         .setup          = xs_setup_tcp,
3094 };
3095 
3096 static struct xprt_class        xs_bc_tcp_transport = {
3097         .list           = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
3098         .name           = "tcp NFSv4.1 backchannel",
3099         .owner          = THIS_MODULE,
3100         .ident          = XPRT_TRANSPORT_BC_TCP,
3101         .setup          = xs_setup_bc_tcp,
3102 };
3103 
3104 /**
3105  * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3106  *
3107  */
3108 int init_socket_xprt(void)
3109 {
3110 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3111         if (!sunrpc_table_header)
3112                 sunrpc_table_header = register_sysctl_table(sunrpc_table);
3113 #endif
3114 
3115         xprt_register_transport(&xs_local_transport);
3116         xprt_register_transport(&xs_udp_transport);
3117         xprt_register_transport(&xs_tcp_transport);
3118         xprt_register_transport(&xs_bc_tcp_transport);
3119 
3120         return 0;
3121 }
3122 
3123 /**
3124  * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3125  *
3126  */
3127 void cleanup_socket_xprt(void)
3128 {
3129 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
3130         if (sunrpc_table_header) {
3131                 unregister_sysctl_table(sunrpc_table_header);
3132                 sunrpc_table_header = NULL;
3133         }
3134 #endif
3135 
3136         xprt_unregister_transport(&xs_local_transport);
3137         xprt_unregister_transport(&xs_udp_transport);
3138         xprt_unregister_transport(&xs_tcp_transport);
3139         xprt_unregister_transport(&xs_bc_tcp_transport);
3140 }
3141 
3142 static int param_set_uint_minmax(const char *val,
3143                 const struct kernel_param *kp,
3144                 unsigned int min, unsigned int max)
3145 {
3146         unsigned int num;
3147         int ret;
3148 
3149         if (!val)
3150                 return -EINVAL;
3151         ret = kstrtouint(val, 0, &num);
3152         if (ret == -EINVAL || num < min || num > max)
3153                 return -EINVAL;
3154         *((unsigned int *)kp->arg) = num;
3155         return 0;
3156 }
3157 
3158 static int param_set_portnr(const char *val, const struct kernel_param *kp)
3159 {
3160         return param_set_uint_minmax(val, kp,
3161                         RPC_MIN_RESVPORT,
3162                         RPC_MAX_RESVPORT);
3163 }
3164 
3165 static const struct kernel_param_ops param_ops_portnr = {
3166         .set = param_set_portnr,
3167         .get = param_get_uint,
3168 };
3169 
3170 #define param_check_portnr(name, p) \
3171         __param_check(name, p, unsigned int);
3172 
3173 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
3174 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
3175 
3176 static int param_set_slot_table_size(const char *val,
3177                                      const struct kernel_param *kp)
3178 {
3179         return param_set_uint_minmax(val, kp,
3180                         RPC_MIN_SLOT_TABLE,
3181                         RPC_MAX_SLOT_TABLE);
3182 }
3183 
3184 static const struct kernel_param_ops param_ops_slot_table_size = {
3185         .set = param_set_slot_table_size,
3186         .get = param_get_uint,
3187 };
3188 
3189 #define param_check_slot_table_size(name, p) \
3190         __param_check(name, p, unsigned int);
3191 
3192 static int param_set_max_slot_table_size(const char *val,
3193                                      const struct kernel_param *kp)
3194 {
3195         return param_set_uint_minmax(val, kp,
3196                         RPC_MIN_SLOT_TABLE,
3197                         RPC_MAX_SLOT_TABLE_LIMIT);
3198 }
3199 
3200 static const struct kernel_param_ops param_ops_max_slot_table_size = {
3201         .set = param_set_max_slot_table_size,
3202         .get = param_get_uint,
3203 };
3204 
3205 #define param_check_max_slot_table_size(name, p) \
3206         __param_check(name, p, unsigned int);
3207 
3208 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
3209                    slot_table_size, 0644);
3210 module_param_named(tcp_max_slot_table_entries, xprt_max_tcp_slot_table_entries,
3211                    max_slot_table_size, 0644);
3212 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
3213                    slot_table_size, 0644);
3214 
3215 

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