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SUNRPC: Handle EINVAL error returns from the TCP connect operation
[linux-2.6/mini2440.git] / net / sunrpc / xprtsock.c
blob712412982ceef0b8e7c0eb0752fe50b97e133294
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/slab.h>
23 #include <linux/module.h>
24 #include <linux/capability.h>
25 #include <linux/pagemap.h>
26 #include <linux/errno.h>
27 #include <linux/socket.h>
28 #include <linux/in.h>
29 #include <linux/net.h>
30 #include <linux/mm.h>
31 #include <linux/udp.h>
32 #include <linux/tcp.h>
33 #include <linux/sunrpc/clnt.h>
34 #include <linux/sunrpc/sched.h>
35 #include <linux/sunrpc/svcsock.h>
36 #include <linux/sunrpc/xprtsock.h>
37 #include <linux/file.h>
38 #ifdef CONFIG_NFS_V4_1
39 #include <linux/sunrpc/bc_xprt.h>
40 #endif
41
42 #include <net/sock.h>
43 #include <net/checksum.h>
44 #include <net/udp.h>
45 #include <net/tcp.h>
46
47 #include "sunrpc.h"
48 /*
49 * xprtsock tunables
50 */
51 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
52 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
53
54 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
55 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
56
57 #define XS_TCP_LINGER_TO (15U * HZ)
58 static unsigned int xs_tcp_fin_timeout __read_mostly = XS_TCP_LINGER_TO;
59
60 /*
61 * We can register our own files under /proc/sys/sunrpc by
62 * calling register_sysctl_table() again. The files in that
63 * directory become the union of all files registered there.
64 *
65 * We simply need to make sure that we don't collide with
66 * someone else's file names!
67 */
68
69 #ifdef RPC_DEBUG
70
71 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
72 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
73 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
74 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
75
76 static struct ctl_table_header *sunrpc_table_header;
77
78 /*
79 * FIXME: changing the UDP slot table size should also resize the UDP
80 * socket buffers for existing UDP transports
81 */
82 static ctl_table xs_tunables_table[] = {
83 {
84 .procname = "udp_slot_table_entries",
85 .data = &xprt_udp_slot_table_entries,
86 .maxlen = sizeof(unsigned int),
87 .mode = 0644,
88 .proc_handler = proc_dointvec_minmax,
89 .extra1 = &min_slot_table_size,
90 .extra2 = &max_slot_table_size
91 },
92 {
93 .procname = "tcp_slot_table_entries",
94 .data = &xprt_tcp_slot_table_entries,
95 .maxlen = sizeof(unsigned int),
96 .mode = 0644,
97 .proc_handler = proc_dointvec_minmax,
98 .extra1 = &min_slot_table_size,
99 .extra2 = &max_slot_table_size
100 },
101 {
102 .procname = "min_resvport",
103 .data = &xprt_min_resvport,
104 .maxlen = sizeof(unsigned int),
105 .mode = 0644,
106 .proc_handler = proc_dointvec_minmax,
107 .extra1 = &xprt_min_resvport_limit,
108 .extra2 = &xprt_max_resvport_limit
109 },
110 {
111 .procname = "max_resvport",
112 .data = &xprt_max_resvport,
113 .maxlen = sizeof(unsigned int),
114 .mode = 0644,
115 .proc_handler = proc_dointvec_minmax,
116 .extra1 = &xprt_min_resvport_limit,
117 .extra2 = &xprt_max_resvport_limit
118 },
119 {
120 .procname = "tcp_fin_timeout",
121 .data = &xs_tcp_fin_timeout,
122 .maxlen = sizeof(xs_tcp_fin_timeout),
123 .mode = 0644,
124 .proc_handler = proc_dointvec_jiffies,
125 },
126 { },
127 };
128
129 static ctl_table sunrpc_table[] = {
130 {
131 .procname = "sunrpc",
132 .mode = 0555,
133 .child = xs_tunables_table
134 },
135 { },
136 };
137
138 #endif
139
140 /*
141 * Time out for an RPC UDP socket connect. UDP socket connects are
142 * synchronous, but we set a timeout anyway in case of resource
143 * exhaustion on the local host.
144 */
145 #define XS_UDP_CONN_TO (5U * HZ)
146
147 /*
148 * Wait duration for an RPC TCP connection to be established. Solaris
149 * NFS over TCP uses 60 seconds, for example, which is in line with how
150 * long a server takes to reboot.
151 */
152 #define XS_TCP_CONN_TO (60U * HZ)
153
154 /*
155 * Wait duration for a reply from the RPC portmapper.
156 */
157 #define XS_BIND_TO (60U * HZ)
158
159 /*
160 * Delay if a UDP socket connect error occurs. This is most likely some
161 * kind of resource problem on the local host.
162 */
163 #define XS_UDP_REEST_TO (2U * HZ)
164
165 /*
166 * The reestablish timeout allows clients to delay for a bit before attempting
167 * to reconnect to a server that just dropped our connection.
168 *
169 * We implement an exponential backoff when trying to reestablish a TCP
170 * transport connection with the server. Some servers like to drop a TCP
171 * connection when they are overworked, so we start with a short timeout and
172 * increase over time if the server is down or not responding.
173 */
174 #define XS_TCP_INIT_REEST_TO (3U * HZ)
175 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
176
177 /*
178 * TCP idle timeout; client drops the transport socket if it is idle
179 * for this long. Note that we also timeout UDP sockets to prevent
180 * holding port numbers when there is no RPC traffic.
181 */
182 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
183
184 #ifdef RPC_DEBUG
185 # undef RPC_DEBUG_DATA
186 # define RPCDBG_FACILITY RPCDBG_TRANS
187 #endif
188
189 #ifdef RPC_DEBUG_DATA
190 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
191 {
192 u8 *buf = (u8 *) packet;
193 int j;
194
195 dprintk("RPC: %s\n", msg);
196 for (j = 0; j < count && j < 128; j += 4) {
197 if (!(j & 31)) {
198 if (j)
199 dprintk("\n");
200 dprintk("0x%04x ", j);
201 }
202 dprintk("%02x%02x%02x%02x ",
203 buf[j], buf[j+1], buf[j+2], buf[j+3]);
204 }
205 dprintk("\n");
206 }
207 #else
208 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
209 {
210 /* NOP */
211 }
212 #endif
213
214 struct sock_xprt {
215 struct rpc_xprt xprt;
216
217 /*
218 * Network layer
219 */
220 struct socket * sock;
221 struct sock * inet;
222
223 /*
224 * State of TCP reply receive
225 */
226 __be32 tcp_fraghdr,
227 tcp_xid;
228
229 u32 tcp_offset,
230 tcp_reclen;
231
232 unsigned long tcp_copied,
233 tcp_flags;
234
235 /*
236 * Connection of transports
237 */
238 struct delayed_work connect_worker;
239 struct sockaddr_storage srcaddr;
240 unsigned short srcport;
241
242 /*
243 * UDP socket buffer size parameters
244 */
245 size_t rcvsize,
246 sndsize;
247
248 /*
249 * Saved socket callback addresses
250 */
251 void (*old_data_ready)(struct sock *, int);
252 void (*old_state_change)(struct sock *);
253 void (*old_write_space)(struct sock *);
254 void (*old_error_report)(struct sock *);
255 };
256
257 /*
258 * TCP receive state flags
259 */
260 #define TCP_RCV_LAST_FRAG (1UL << 0)
261 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
262 #define TCP_RCV_COPY_XID (1UL << 2)
263 #define TCP_RCV_COPY_DATA (1UL << 3)
264 #define TCP_RCV_READ_CALLDIR (1UL << 4)
265 #define TCP_RCV_COPY_CALLDIR (1UL << 5)
266
267 /*
268 * TCP RPC flags
269 */
270 #define TCP_RPC_REPLY (1UL << 6)
271
272 static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt)
273 {
274 return (struct sockaddr *) &xprt->addr;
275 }
276
277 static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt)
278 {
279 return (struct sockaddr_in *) &xprt->addr;
280 }
281
282 static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt)
283 {
284 return (struct sockaddr_in6 *) &xprt->addr;
285 }
286
287 static void xs_format_common_peer_addresses(struct rpc_xprt *xprt)
288 {
289 struct sockaddr *sap = xs_addr(xprt);
290 struct sockaddr_in6 *sin6;
291 struct sockaddr_in *sin;
292 char buf[128];
293
294 (void)rpc_ntop(sap, buf, sizeof(buf));
295 xprt->address_strings[RPC_DISPLAY_ADDR] = kstrdup(buf, GFP_KERNEL);
296
297 switch (sap->sa_family) {
298 case AF_INET:
299 sin = xs_addr_in(xprt);
300 (void)snprintf(buf, sizeof(buf), "%02x%02x%02x%02x",
301 NIPQUAD(sin->sin_addr.s_addr));
302 break;
303 case AF_INET6:
304 sin6 = xs_addr_in6(xprt);
305 (void)snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
306 break;
307 default:
308 BUG();
309 }
310 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
311 }
312
313 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
314 {
315 struct sockaddr *sap = xs_addr(xprt);
316 char buf[128];
317
318 (void)snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
319 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
320
321 (void)snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
322 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
323 }
324
325 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
326 const char *protocol,
327 const char *netid)
328 {
329 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
330 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
331 xs_format_common_peer_addresses(xprt);
332 xs_format_common_peer_ports(xprt);
333 }
334
335 static void xs_update_peer_port(struct rpc_xprt *xprt)
336 {
337 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
338 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
339
340 xs_format_common_peer_ports(xprt);
341 }
342
343 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
344 {
345 unsigned int i;
346
347 for (i = 0; i < RPC_DISPLAY_MAX; i++)
348 switch (i) {
349 case RPC_DISPLAY_PROTO:
350 case RPC_DISPLAY_NETID:
351 continue;
352 default:
353 kfree(xprt->address_strings[i]);
354 }
355 }
356
357 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
358
359 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
360 {
361 struct msghdr msg = {
362 .msg_name = addr,
363 .msg_namelen = addrlen,
364 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
365 };
366 struct kvec iov = {
367 .iov_base = vec->iov_base + base,
368 .iov_len = vec->iov_len - base,
369 };
370
371 if (iov.iov_len != 0)
372 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
373 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
374 }
375
376 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
377 {
378 struct page **ppage;
379 unsigned int remainder;
380 int err, sent = 0;
381
382 remainder = xdr->page_len - base;
383 base += xdr->page_base;
384 ppage = xdr->pages + (base >> PAGE_SHIFT);
385 base &= ~PAGE_MASK;
386 for(;;) {
387 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
388 int flags = XS_SENDMSG_FLAGS;
389
390 remainder -= len;
391 if (remainder != 0 || more)
392 flags |= MSG_MORE;
393 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
394 if (remainder == 0 || err != len)
395 break;
396 sent += err;
397 ppage++;
398 base = 0;
399 }
400 if (sent == 0)
401 return err;
402 if (err > 0)
403 sent += err;
404 return sent;
405 }
406
407 /**
408 * xs_sendpages - write pages directly to a socket
409 * @sock: socket to send on
410 * @addr: UDP only -- address of destination
411 * @addrlen: UDP only -- length of destination address
412 * @xdr: buffer containing this request
413 * @base: starting position in the buffer
414 *
415 */
416 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
417 {
418 unsigned int remainder = xdr->len - base;
419 int err, sent = 0;
420
421 if (unlikely(!sock))
422 return -ENOTSOCK;
423
424 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
425 if (base != 0) {
426 addr = NULL;
427 addrlen = 0;
428 }
429
430 if (base < xdr->head[0].iov_len || addr != NULL) {
431 unsigned int len = xdr->head[0].iov_len - base;
432 remainder -= len;
433 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
434 if (remainder == 0 || err != len)
435 goto out;
436 sent += err;
437 base = 0;
438 } else
439 base -= xdr->head[0].iov_len;
440
441 if (base < xdr->page_len) {
442 unsigned int len = xdr->page_len - base;
443 remainder -= len;
444 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
445 if (remainder == 0 || err != len)
446 goto out;
447 sent += err;
448 base = 0;
449 } else
450 base -= xdr->page_len;
451
452 if (base >= xdr->tail[0].iov_len)
453 return sent;
454 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
455 out:
456 if (sent == 0)
457 return err;
458 if (err > 0)
459 sent += err;
460 return sent;
461 }
462
463 static void xs_nospace_callback(struct rpc_task *task)
464 {
465 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
466
467 transport->inet->sk_write_pending--;
468 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
469 }
470
471 /**
472 * xs_nospace - place task on wait queue if transmit was incomplete
473 * @task: task to put to sleep
474 *
475 */
476 static int xs_nospace(struct rpc_task *task)
477 {
478 struct rpc_rqst *req = task->tk_rqstp;
479 struct rpc_xprt *xprt = req->rq_xprt;
480 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
481 int ret = 0;
482
483 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
484 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
485 req->rq_slen);
486
487 /* Protect against races with write_space */
488 spin_lock_bh(&xprt->transport_lock);
489
490 /* Don't race with disconnect */
491 if (xprt_connected(xprt)) {
492 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
493 ret = -EAGAIN;
494 /*
495 * Notify TCP that we're limited by the application
496 * window size
497 */
498 set_bit(SOCK_NOSPACE, &transport->sock->flags);
499 transport->inet->sk_write_pending++;
500 /* ...and wait for more buffer space */
501 xprt_wait_for_buffer_space(task, xs_nospace_callback);
502 }
503 } else {
504 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
505 ret = -ENOTCONN;
506 }
507
508 spin_unlock_bh(&xprt->transport_lock);
509 return ret;
510 }
511
512 /**
513 * xs_udp_send_request - write an RPC request to a UDP socket
514 * @task: address of RPC task that manages the state of an RPC request
515 *
516 * Return values:
517 * 0: The request has been sent
518 * EAGAIN: The socket was blocked, please call again later to
519 * complete the request
520 * ENOTCONN: Caller needs to invoke connect logic then call again
521 * other: Some other error occured, the request was not sent
522 */
523 static int xs_udp_send_request(struct rpc_task *task)
524 {
525 struct rpc_rqst *req = task->tk_rqstp;
526 struct rpc_xprt *xprt = req->rq_xprt;
527 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
528 struct xdr_buf *xdr = &req->rq_snd_buf;
529 int status;
530
531 xs_pktdump("packet data:",
532 req->rq_svec->iov_base,
533 req->rq_svec->iov_len);
534
535 if (!xprt_bound(xprt))
536 return -ENOTCONN;
537 status = xs_sendpages(transport->sock,
538 xs_addr(xprt),
539 xprt->addrlen, xdr,
540 req->rq_bytes_sent);
541
542 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
543 xdr->len - req->rq_bytes_sent, status);
544
545 if (status >= 0) {
546 task->tk_bytes_sent += status;
547 if (status >= req->rq_slen)
548 return 0;
549 /* Still some bytes left; set up for a retry later. */
550 status = -EAGAIN;
551 }
552 if (!transport->sock)
553 goto out;
554
555 switch (status) {
556 case -ENOTSOCK:
557 status = -ENOTCONN;
558 /* Should we call xs_close() here? */
559 break;
560 case -EAGAIN:
561 status = xs_nospace(task);
562 break;
563 default:
564 dprintk("RPC: sendmsg returned unrecognized error %d\n",
565 -status);
566 case -ENETUNREACH:
567 case -EPIPE:
568 case -ECONNREFUSED:
569 /* When the server has died, an ICMP port unreachable message
570 * prompts ECONNREFUSED. */
571 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
572 }
573 out:
574 return status;
575 }
576
577 /**
578 * xs_tcp_shutdown - gracefully shut down a TCP socket
579 * @xprt: transport
580 *
581 * Initiates a graceful shutdown of the TCP socket by calling the
582 * equivalent of shutdown(SHUT_WR);
583 */
584 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
585 {
586 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
587 struct socket *sock = transport->sock;
588
589 if (sock != NULL)
590 kernel_sock_shutdown(sock, SHUT_WR);
591 }
592
593 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
594 {
595 u32 reclen = buf->len - sizeof(rpc_fraghdr);
596 rpc_fraghdr *base = buf->head[0].iov_base;
597 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
598 }
599
600 /**
601 * xs_tcp_send_request - write an RPC request to a TCP socket
602 * @task: address of RPC task that manages the state of an RPC request
603 *
604 * Return values:
605 * 0: The request has been sent
606 * EAGAIN: The socket was blocked, please call again later to
607 * complete the request
608 * ENOTCONN: Caller needs to invoke connect logic then call again
609 * other: Some other error occured, the request was not sent
610 *
611 * XXX: In the case of soft timeouts, should we eventually give up
612 * if sendmsg is not able to make progress?
613 */
614 static int xs_tcp_send_request(struct rpc_task *task)
615 {
616 struct rpc_rqst *req = task->tk_rqstp;
617 struct rpc_xprt *xprt = req->rq_xprt;
618 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
619 struct xdr_buf *xdr = &req->rq_snd_buf;
620 int status;
621
622 xs_encode_tcp_record_marker(&req->rq_snd_buf);
623
624 xs_pktdump("packet data:",
625 req->rq_svec->iov_base,
626 req->rq_svec->iov_len);
627
628 /* Continue transmitting the packet/record. We must be careful
629 * to cope with writespace callbacks arriving _after_ we have
630 * called sendmsg(). */
631 while (1) {
632 status = xs_sendpages(transport->sock,
633 NULL, 0, xdr, req->rq_bytes_sent);
634
635 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
636 xdr->len - req->rq_bytes_sent, status);
637
638 if (unlikely(status < 0))
639 break;
640
641 /* If we've sent the entire packet, immediately
642 * reset the count of bytes sent. */
643 req->rq_bytes_sent += status;
644 task->tk_bytes_sent += status;
645 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
646 req->rq_bytes_sent = 0;
647 return 0;
648 }
649
650 if (status != 0)
651 continue;
652 status = -EAGAIN;
653 break;
654 }
655 if (!transport->sock)
656 goto out;
657
658 switch (status) {
659 case -ENOTSOCK:
660 status = -ENOTCONN;
661 /* Should we call xs_close() here? */
662 break;
663 case -EAGAIN:
664 status = xs_nospace(task);
665 break;
666 default:
667 dprintk("RPC: sendmsg returned unrecognized error %d\n",
668 -status);
669 case -ECONNRESET:
670 case -EPIPE:
671 xs_tcp_shutdown(xprt);
672 case -ECONNREFUSED:
673 case -ENOTCONN:
674 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
675 }
676 out:
677 return status;
678 }
679
680 /**
681 * xs_tcp_release_xprt - clean up after a tcp transmission
682 * @xprt: transport
683 * @task: rpc task
684 *
685 * This cleans up if an error causes us to abort the transmission of a request.
686 * In this case, the socket may need to be reset in order to avoid confusing
687 * the server.
688 */
689 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
690 {
691 struct rpc_rqst *req;
692
693 if (task != xprt->snd_task)
694 return;
695 if (task == NULL)
696 goto out_release;
697 req = task->tk_rqstp;
698 if (req->rq_bytes_sent == 0)
699 goto out_release;
700 if (req->rq_bytes_sent == req->rq_snd_buf.len)
701 goto out_release;
702 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
703 out_release:
704 xprt_release_xprt(xprt, task);
705 }
706
707 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
708 {
709 transport->old_data_ready = sk->sk_data_ready;
710 transport->old_state_change = sk->sk_state_change;
711 transport->old_write_space = sk->sk_write_space;
712 transport->old_error_report = sk->sk_error_report;
713 }
714
715 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
716 {
717 sk->sk_data_ready = transport->old_data_ready;
718 sk->sk_state_change = transport->old_state_change;
719 sk->sk_write_space = transport->old_write_space;
720 sk->sk_error_report = transport->old_error_report;
721 }
722
723 static void xs_reset_transport(struct sock_xprt *transport)
724 {
725 struct socket *sock = transport->sock;
726 struct sock *sk = transport->inet;
727
728 if (sk == NULL)
729 return;
730
731 write_lock_bh(&sk->sk_callback_lock);
732 transport->inet = NULL;
733 transport->sock = NULL;
734
735 sk->sk_user_data = NULL;
736
737 xs_restore_old_callbacks(transport, sk);
738 write_unlock_bh(&sk->sk_callback_lock);
739
740 sk->sk_no_check = 0;
741
742 sock_release(sock);
743 }
744
745 /**
746 * xs_close - close a socket
747 * @xprt: transport
748 *
749 * This is used when all requests are complete; ie, no DRC state remains
750 * on the server we want to save.
751 *
752 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
753 * xs_reset_transport() zeroing the socket from underneath a writer.
754 */
755 static void xs_close(struct rpc_xprt *xprt)
756 {
757 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
758
759 dprintk("RPC: xs_close xprt %p\n", xprt);
760
761 xs_reset_transport(transport);
762 xprt->reestablish_timeout = 0;
763
764 smp_mb__before_clear_bit();
765 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
766 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
767 clear_bit(XPRT_CLOSING, &xprt->state);
768 smp_mb__after_clear_bit();
769 xprt_disconnect_done(xprt);
770 }
771
772 static void xs_tcp_close(struct rpc_xprt *xprt)
773 {
774 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
775 xs_close(xprt);
776 else
777 xs_tcp_shutdown(xprt);
778 }
779
780 /**
781 * xs_destroy - prepare to shutdown a transport
782 * @xprt: doomed transport
783 *
784 */
785 static void xs_destroy(struct rpc_xprt *xprt)
786 {
787 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
788
789 dprintk("RPC: xs_destroy xprt %p\n", xprt);
790
791 cancel_rearming_delayed_work(&transport->connect_worker);
792
793 xs_close(xprt);
794 xs_free_peer_addresses(xprt);
795 kfree(xprt->slot);
796 kfree(xprt);
797 module_put(THIS_MODULE);
798 }
799
800 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
801 {
802 return (struct rpc_xprt *) sk->sk_user_data;
803 }
804
805 /**
806 * xs_udp_data_ready - "data ready" callback for UDP sockets
807 * @sk: socket with data to read
808 * @len: how much data to read
809 *
810 */
811 static void xs_udp_data_ready(struct sock *sk, int len)
812 {
813 struct rpc_task *task;
814 struct rpc_xprt *xprt;
815 struct rpc_rqst *rovr;
816 struct sk_buff *skb;
817 int err, repsize, copied;
818 u32 _xid;
819 __be32 *xp;
820
821 read_lock(&sk->sk_callback_lock);
822 dprintk("RPC: xs_udp_data_ready...\n");
823 if (!(xprt = xprt_from_sock(sk)))
824 goto out;
825
826 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
827 goto out;
828
829 if (xprt->shutdown)
830 goto dropit;
831
832 repsize = skb->len - sizeof(struct udphdr);
833 if (repsize < 4) {
834 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
835 goto dropit;
836 }
837
838 /* Copy the XID from the skb... */
839 xp = skb_header_pointer(skb, sizeof(struct udphdr),
840 sizeof(_xid), &_xid);
841 if (xp == NULL)
842 goto dropit;
843
844 /* Look up and lock the request corresponding to the given XID */
845 spin_lock(&xprt->transport_lock);
846 rovr = xprt_lookup_rqst(xprt, *xp);
847 if (!rovr)
848 goto out_unlock;
849 task = rovr->rq_task;
850
851 if ((copied = rovr->rq_private_buf.buflen) > repsize)
852 copied = repsize;
853
854 /* Suck it into the iovec, verify checksum if not done by hw. */
855 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
856 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
857 goto out_unlock;
858 }
859
860 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
861
862 /* Something worked... */
863 dst_confirm(skb_dst(skb));
864
865 xprt_adjust_cwnd(task, copied);
866 xprt_update_rtt(task);
867 xprt_complete_rqst(task, copied);
868
869 out_unlock:
870 spin_unlock(&xprt->transport_lock);
871 dropit:
872 skb_free_datagram(sk, skb);
873 out:
874 read_unlock(&sk->sk_callback_lock);
875 }
876
877 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
878 {
879 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
880 size_t len, used;
881 char *p;
882
883 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
884 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
885 used = xdr_skb_read_bits(desc, p, len);
886 transport->tcp_offset += used;
887 if (used != len)
888 return;
889
890 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
891 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
892 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
893 else
894 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
895 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
896
897 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
898 transport->tcp_offset = 0;
899
900 /* Sanity check of the record length */
901 if (unlikely(transport->tcp_reclen < 8)) {
902 dprintk("RPC: invalid TCP record fragment length\n");
903 xprt_force_disconnect(xprt);
904 return;
905 }
906 dprintk("RPC: reading TCP record fragment of length %d\n",
907 transport->tcp_reclen);
908 }
909
910 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
911 {
912 if (transport->tcp_offset == transport->tcp_reclen) {
913 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
914 transport->tcp_offset = 0;
915 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
916 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
917 transport->tcp_flags |= TCP_RCV_COPY_XID;
918 transport->tcp_copied = 0;
919 }
920 }
921 }
922
923 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
924 {
925 size_t len, used;
926 char *p;
927
928 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
929 dprintk("RPC: reading XID (%Zu bytes)\n", len);
930 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
931 used = xdr_skb_read_bits(desc, p, len);
932 transport->tcp_offset += used;
933 if (used != len)
934 return;
935 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
936 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
937 transport->tcp_copied = 4;
938 dprintk("RPC: reading %s XID %08x\n",
939 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
940 : "request with",
941 ntohl(transport->tcp_xid));
942 xs_tcp_check_fraghdr(transport);
943 }
944
945 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
946 struct xdr_skb_reader *desc)
947 {
948 size_t len, used;
949 u32 offset;
950 __be32 calldir;
951
952 /*
953 * We want transport->tcp_offset to be 8 at the end of this routine
954 * (4 bytes for the xid and 4 bytes for the call/reply flag).
955 * When this function is called for the first time,
956 * transport->tcp_offset is 4 (after having already read the xid).
957 */
958 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
959 len = sizeof(calldir) - offset;
960 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
961 used = xdr_skb_read_bits(desc, &calldir, len);
962 transport->tcp_offset += used;
963 if (used != len)
964 return;
965 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
966 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
967 transport->tcp_flags |= TCP_RCV_COPY_DATA;
968 /*
969 * We don't yet have the XDR buffer, so we will write the calldir
970 * out after we get the buffer from the 'struct rpc_rqst'
971 */
972 if (ntohl(calldir) == RPC_REPLY)
973 transport->tcp_flags |= TCP_RPC_REPLY;
974 else
975 transport->tcp_flags &= ~TCP_RPC_REPLY;
976 dprintk("RPC: reading %s CALL/REPLY flag %08x\n",
977 (transport->tcp_flags & TCP_RPC_REPLY) ?
978 "reply for" : "request with", calldir);
979 xs_tcp_check_fraghdr(transport);
980 }
981
982 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
983 struct xdr_skb_reader *desc,
984 struct rpc_rqst *req)
985 {
986 struct sock_xprt *transport =
987 container_of(xprt, struct sock_xprt, xprt);
988 struct xdr_buf *rcvbuf;
989 size_t len;
990 ssize_t r;
991
992 rcvbuf = &req->rq_private_buf;
993
994 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
995 /*
996 * Save the RPC direction in the XDR buffer
997 */
998 __be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ?
999 htonl(RPC_REPLY) : 0;
1000
1001 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
1002 &calldir, sizeof(calldir));
1003 transport->tcp_copied += sizeof(calldir);
1004 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1005 }
1006
1007 len = desc->count;
1008 if (len > transport->tcp_reclen - transport->tcp_offset) {
1009 struct xdr_skb_reader my_desc;
1010
1011 len = transport->tcp_reclen - transport->tcp_offset;
1012 memcpy(&my_desc, desc, sizeof(my_desc));
1013 my_desc.count = len;
1014 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1015 &my_desc, xdr_skb_read_bits);
1016 desc->count -= r;
1017 desc->offset += r;
1018 } else
1019 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1020 desc, xdr_skb_read_bits);
1021
1022 if (r > 0) {
1023 transport->tcp_copied += r;
1024 transport->tcp_offset += r;
1025 }
1026 if (r != len) {
1027 /* Error when copying to the receive buffer,
1028 * usually because we weren't able to allocate
1029 * additional buffer pages. All we can do now
1030 * is turn off TCP_RCV_COPY_DATA, so the request
1031 * will not receive any additional updates,
1032 * and time out.
1033 * Any remaining data from this record will
1034 * be discarded.
1035 */
1036 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1037 dprintk("RPC: XID %08x truncated request\n",
1038 ntohl(transport->tcp_xid));
1039 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1040 "tcp_offset = %u, tcp_reclen = %u\n",
1041 xprt, transport->tcp_copied,
1042 transport->tcp_offset, transport->tcp_reclen);
1043 return;
1044 }
1045
1046 dprintk("RPC: XID %08x read %Zd bytes\n",
1047 ntohl(transport->tcp_xid), r);
1048 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1049 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1050 transport->tcp_offset, transport->tcp_reclen);
1051
1052 if (transport->tcp_copied == req->rq_private_buf.buflen)
1053 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1054 else if (transport->tcp_offset == transport->tcp_reclen) {
1055 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1056 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1057 }
1058
1059 return;
1060 }
1061
1062 /*
1063 * Finds the request corresponding to the RPC xid and invokes the common
1064 * tcp read code to read the data.
1065 */
1066 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1067 struct xdr_skb_reader *desc)
1068 {
1069 struct sock_xprt *transport =
1070 container_of(xprt, struct sock_xprt, xprt);
1071 struct rpc_rqst *req;
1072
1073 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1074
1075 /* Find and lock the request corresponding to this xid */
1076 spin_lock(&xprt->transport_lock);
1077 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1078 if (!req) {
1079 dprintk("RPC: XID %08x request not found!\n",
1080 ntohl(transport->tcp_xid));
1081 spin_unlock(&xprt->transport_lock);
1082 return -1;
1083 }
1084
1085 xs_tcp_read_common(xprt, desc, req);
1086
1087 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1088 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1089
1090 spin_unlock(&xprt->transport_lock);
1091 return 0;
1092 }
1093
1094 #if defined(CONFIG_NFS_V4_1)
1095 /*
1096 * Obtains an rpc_rqst previously allocated and invokes the common
1097 * tcp read code to read the data. The result is placed in the callback
1098 * queue.
1099 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1100 * connection and return -1.
1101 */
1102 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1103 struct xdr_skb_reader *desc)
1104 {
1105 struct sock_xprt *transport =
1106 container_of(xprt, struct sock_xprt, xprt);
1107 struct rpc_rqst *req;
1108
1109 req = xprt_alloc_bc_request(xprt);
1110 if (req == NULL) {
1111 printk(KERN_WARNING "Callback slot table overflowed\n");
1112 xprt_force_disconnect(xprt);
1113 return -1;
1114 }
1115
1116 req->rq_xid = transport->tcp_xid;
1117 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1118 xs_tcp_read_common(xprt, desc, req);
1119
1120 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1121 struct svc_serv *bc_serv = xprt->bc_serv;
1122
1123 /*
1124 * Add callback request to callback list. The callback
1125 * service sleeps on the sv_cb_waitq waiting for new
1126 * requests. Wake it up after adding enqueing the
1127 * request.
1128 */
1129 dprintk("RPC: add callback request to list\n");
1130 spin_lock(&bc_serv->sv_cb_lock);
1131 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1132 spin_unlock(&bc_serv->sv_cb_lock);
1133 wake_up(&bc_serv->sv_cb_waitq);
1134 }
1135
1136 req->rq_private_buf.len = transport->tcp_copied;
1137
1138 return 0;
1139 }
1140
1141 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1142 struct xdr_skb_reader *desc)
1143 {
1144 struct sock_xprt *transport =
1145 container_of(xprt, struct sock_xprt, xprt);
1146
1147 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1148 xs_tcp_read_reply(xprt, desc) :
1149 xs_tcp_read_callback(xprt, desc);
1150 }
1151 #else
1152 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1153 struct xdr_skb_reader *desc)
1154 {
1155 return xs_tcp_read_reply(xprt, desc);
1156 }
1157 #endif /* CONFIG_NFS_V4_1 */
1158
1159 /*
1160 * Read data off the transport. This can be either an RPC_CALL or an
1161 * RPC_REPLY. Relay the processing to helper functions.
1162 */
1163 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1164 struct xdr_skb_reader *desc)
1165 {
1166 struct sock_xprt *transport =
1167 container_of(xprt, struct sock_xprt, xprt);
1168
1169 if (_xs_tcp_read_data(xprt, desc) == 0)
1170 xs_tcp_check_fraghdr(transport);
1171 else {
1172 /*
1173 * The transport_lock protects the request handling.
1174 * There's no need to hold it to update the tcp_flags.
1175 */
1176 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1177 }
1178 }
1179
1180 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1181 {
1182 size_t len;
1183
1184 len = transport->tcp_reclen - transport->tcp_offset;
1185 if (len > desc->count)
1186 len = desc->count;
1187 desc->count -= len;
1188 desc->offset += len;
1189 transport->tcp_offset += len;
1190 dprintk("RPC: discarded %Zu bytes\n", len);
1191 xs_tcp_check_fraghdr(transport);
1192 }
1193
1194 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1195 {
1196 struct rpc_xprt *xprt = rd_desc->arg.data;
1197 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1198 struct xdr_skb_reader desc = {
1199 .skb = skb,
1200 .offset = offset,
1201 .count = len,
1202 };
1203
1204 dprintk("RPC: xs_tcp_data_recv started\n");
1205 do {
1206 /* Read in a new fragment marker if necessary */
1207 /* Can we ever really expect to get completely empty fragments? */
1208 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1209 xs_tcp_read_fraghdr(xprt, &desc);
1210 continue;
1211 }
1212 /* Read in the xid if necessary */
1213 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1214 xs_tcp_read_xid(transport, &desc);
1215 continue;
1216 }
1217 /* Read in the call/reply flag */
1218 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1219 xs_tcp_read_calldir(transport, &desc);
1220 continue;
1221 }
1222 /* Read in the request data */
1223 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1224 xs_tcp_read_data(xprt, &desc);
1225 continue;
1226 }
1227 /* Skip over any trailing bytes on short reads */
1228 xs_tcp_read_discard(transport, &desc);
1229 } while (desc.count);
1230 dprintk("RPC: xs_tcp_data_recv done\n");
1231 return len - desc.count;
1232 }
1233
1234 /**
1235 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1236 * @sk: socket with data to read
1237 * @bytes: how much data to read
1238 *
1239 */
1240 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1241 {
1242 struct rpc_xprt *xprt;
1243 read_descriptor_t rd_desc;
1244 int read;
1245
1246 dprintk("RPC: xs_tcp_data_ready...\n");
1247
1248 read_lock(&sk->sk_callback_lock);
1249 if (!(xprt = xprt_from_sock(sk)))
1250 goto out;
1251 if (xprt->shutdown)
1252 goto out;
1253
1254 /* Any data means we had a useful conversation, so
1255 * the we don't need to delay the next reconnect
1256 */
1257 if (xprt->reestablish_timeout)
1258 xprt->reestablish_timeout = 0;
1259
1260 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1261 rd_desc.arg.data = xprt;
1262 do {
1263 rd_desc.count = 65536;
1264 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1265 } while (read > 0);
1266 out:
1267 read_unlock(&sk->sk_callback_lock);
1268 }
1269
1270 /*
1271 * Do the equivalent of linger/linger2 handling for dealing with
1272 * broken servers that don't close the socket in a timely
1273 * fashion
1274 */
1275 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1276 unsigned long timeout)
1277 {
1278 struct sock_xprt *transport;
1279
1280 if (xprt_test_and_set_connecting(xprt))
1281 return;
1282 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1283 transport = container_of(xprt, struct sock_xprt, xprt);
1284 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1285 timeout);
1286 }
1287
1288 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1289 {
1290 struct sock_xprt *transport;
1291
1292 transport = container_of(xprt, struct sock_xprt, xprt);
1293
1294 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1295 !cancel_delayed_work(&transport->connect_worker))
1296 return;
1297 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1298 xprt_clear_connecting(xprt);
1299 }
1300
1301 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1302 {
1303 smp_mb__before_clear_bit();
1304 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1305 clear_bit(XPRT_CLOSING, &xprt->state);
1306 smp_mb__after_clear_bit();
1307 /* Mark transport as closed and wake up all pending tasks */
1308 xprt_disconnect_done(xprt);
1309 }
1310
1311 /**
1312 * xs_tcp_state_change - callback to handle TCP socket state changes
1313 * @sk: socket whose state has changed
1314 *
1315 */
1316 static void xs_tcp_state_change(struct sock *sk)
1317 {
1318 struct rpc_xprt *xprt;
1319
1320 read_lock(&sk->sk_callback_lock);
1321 if (!(xprt = xprt_from_sock(sk)))
1322 goto out;
1323 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1324 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1325 sk->sk_state, xprt_connected(xprt),
1326 sock_flag(sk, SOCK_DEAD),
1327 sock_flag(sk, SOCK_ZAPPED));
1328
1329 switch (sk->sk_state) {
1330 case TCP_ESTABLISHED:
1331 spin_lock_bh(&xprt->transport_lock);
1332 if (!xprt_test_and_set_connected(xprt)) {
1333 struct sock_xprt *transport = container_of(xprt,
1334 struct sock_xprt, xprt);
1335
1336 /* Reset TCP record info */
1337 transport->tcp_offset = 0;
1338 transport->tcp_reclen = 0;
1339 transport->tcp_copied = 0;
1340 transport->tcp_flags =
1341 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1342
1343 xprt_wake_pending_tasks(xprt, -EAGAIN);
1344 }
1345 spin_unlock_bh(&xprt->transport_lock);
1346 break;
1347 case TCP_FIN_WAIT1:
1348 /* The client initiated a shutdown of the socket */
1349 xprt->connect_cookie++;
1350 xprt->reestablish_timeout = 0;
1351 set_bit(XPRT_CLOSING, &xprt->state);
1352 smp_mb__before_clear_bit();
1353 clear_bit(XPRT_CONNECTED, &xprt->state);
1354 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1355 smp_mb__after_clear_bit();
1356 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1357 break;
1358 case TCP_CLOSE_WAIT:
1359 /* The server initiated a shutdown of the socket */
1360 xprt_force_disconnect(xprt);
1361 case TCP_SYN_SENT:
1362 xprt->connect_cookie++;
1363 case TCP_CLOSING:
1364 /*
1365 * If the server closed down the connection, make sure that
1366 * we back off before reconnecting
1367 */
1368 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1369 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1370 break;
1371 case TCP_LAST_ACK:
1372 set_bit(XPRT_CLOSING, &xprt->state);
1373 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1374 smp_mb__before_clear_bit();
1375 clear_bit(XPRT_CONNECTED, &xprt->state);
1376 smp_mb__after_clear_bit();
1377 break;
1378 case TCP_CLOSE:
1379 xs_tcp_cancel_linger_timeout(xprt);
1380 xs_sock_mark_closed(xprt);
1381 }
1382 out:
1383 read_unlock(&sk->sk_callback_lock);
1384 }
1385
1386 /**
1387 * xs_error_report - callback mainly for catching socket errors
1388 * @sk: socket
1389 */
1390 static void xs_error_report(struct sock *sk)
1391 {
1392 struct rpc_xprt *xprt;
1393
1394 read_lock(&sk->sk_callback_lock);
1395 if (!(xprt = xprt_from_sock(sk)))
1396 goto out;
1397 dprintk("RPC: %s client %p...\n"
1398 "RPC: error %d\n",
1399 __func__, xprt, sk->sk_err);
1400 xprt_wake_pending_tasks(xprt, -EAGAIN);
1401 out:
1402 read_unlock(&sk->sk_callback_lock);
1403 }
1404
1405 static void xs_write_space(struct sock *sk)
1406 {
1407 struct socket *sock;
1408 struct rpc_xprt *xprt;
1409
1410 if (unlikely(!(sock = sk->sk_socket)))
1411 return;
1412 clear_bit(SOCK_NOSPACE, &sock->flags);
1413
1414 if (unlikely(!(xprt = xprt_from_sock(sk))))
1415 return;
1416 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1417 return;
1418
1419 xprt_write_space(xprt);
1420 }
1421
1422 /**
1423 * xs_udp_write_space - callback invoked when socket buffer space
1424 * becomes available
1425 * @sk: socket whose state has changed
1426 *
1427 * Called when more output buffer space is available for this socket.
1428 * We try not to wake our writers until they can make "significant"
1429 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1430 * with a bunch of small requests.
1431 */
1432 static void xs_udp_write_space(struct sock *sk)
1433 {
1434 read_lock(&sk->sk_callback_lock);
1435
1436 /* from net/core/sock.c:sock_def_write_space */
1437 if (sock_writeable(sk))
1438 xs_write_space(sk);
1439
1440 read_unlock(&sk->sk_callback_lock);
1441 }
1442
1443 /**
1444 * xs_tcp_write_space - callback invoked when socket buffer space
1445 * becomes available
1446 * @sk: socket whose state has changed
1447 *
1448 * Called when more output buffer space is available for this socket.
1449 * We try not to wake our writers until they can make "significant"
1450 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1451 * with a bunch of small requests.
1452 */
1453 static void xs_tcp_write_space(struct sock *sk)
1454 {
1455 read_lock(&sk->sk_callback_lock);
1456
1457 /* from net/core/stream.c:sk_stream_write_space */
1458 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1459 xs_write_space(sk);
1460
1461 read_unlock(&sk->sk_callback_lock);
1462 }
1463
1464 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1465 {
1466 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1467 struct sock *sk = transport->inet;
1468
1469 if (transport->rcvsize) {
1470 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1471 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1472 }
1473 if (transport->sndsize) {
1474 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1475 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1476 sk->sk_write_space(sk);
1477 }
1478 }
1479
1480 /**
1481 * xs_udp_set_buffer_size - set send and receive limits
1482 * @xprt: generic transport
1483 * @sndsize: requested size of send buffer, in bytes
1484 * @rcvsize: requested size of receive buffer, in bytes
1485 *
1486 * Set socket send and receive buffer size limits.
1487 */
1488 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1489 {
1490 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1491
1492 transport->sndsize = 0;
1493 if (sndsize)
1494 transport->sndsize = sndsize + 1024;
1495 transport->rcvsize = 0;
1496 if (rcvsize)
1497 transport->rcvsize = rcvsize + 1024;
1498
1499 xs_udp_do_set_buffer_size(xprt);
1500 }
1501
1502 /**
1503 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1504 * @task: task that timed out
1505 *
1506 * Adjust the congestion window after a retransmit timeout has occurred.
1507 */
1508 static void xs_udp_timer(struct rpc_task *task)
1509 {
1510 xprt_adjust_cwnd(task, -ETIMEDOUT);
1511 }
1512
1513 static unsigned short xs_get_random_port(void)
1514 {
1515 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1516 unsigned short rand = (unsigned short) net_random() % range;
1517 return rand + xprt_min_resvport;
1518 }
1519
1520 /**
1521 * xs_set_port - reset the port number in the remote endpoint address
1522 * @xprt: generic transport
1523 * @port: new port number
1524 *
1525 */
1526 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1527 {
1528 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1529
1530 rpc_set_port(xs_addr(xprt), port);
1531 xs_update_peer_port(xprt);
1532 }
1533
1534 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1535 {
1536 unsigned short port = transport->srcport;
1537
1538 if (port == 0 && transport->xprt.resvport)
1539 port = xs_get_random_port();
1540 return port;
1541 }
1542
1543 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1544 {
1545 if (transport->srcport != 0)
1546 transport->srcport = 0;
1547 if (!transport->xprt.resvport)
1548 return 0;
1549 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1550 return xprt_max_resvport;
1551 return --port;
1552 }
1553
1554 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1555 {
1556 struct sockaddr_in myaddr = {
1557 .sin_family = AF_INET,
1558 };
1559 struct sockaddr_in *sa;
1560 int err, nloop = 0;
1561 unsigned short port = xs_get_srcport(transport, sock);
1562 unsigned short last;
1563
1564 sa = (struct sockaddr_in *)&transport->srcaddr;
1565 myaddr.sin_addr = sa->sin_addr;
1566 do {
1567 myaddr.sin_port = htons(port);
1568 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1569 sizeof(myaddr));
1570 if (port == 0)
1571 break;
1572 if (err == 0) {
1573 transport->srcport = port;
1574 break;
1575 }
1576 last = port;
1577 port = xs_next_srcport(transport, sock, port);
1578 if (port > last)
1579 nloop++;
1580 } while (err == -EADDRINUSE && nloop != 2);
1581 dprintk("RPC: %s %pI4:%u: %s (%d)\n",
1582 __func__, &myaddr.sin_addr,
1583 port, err ? "failed" : "ok", err);
1584 return err;
1585 }
1586
1587 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1588 {
1589 struct sockaddr_in6 myaddr = {
1590 .sin6_family = AF_INET6,
1591 };
1592 struct sockaddr_in6 *sa;
1593 int err, nloop = 0;
1594 unsigned short port = xs_get_srcport(transport, sock);
1595 unsigned short last;
1596
1597 sa = (struct sockaddr_in6 *)&transport->srcaddr;
1598 myaddr.sin6_addr = sa->sin6_addr;
1599 do {
1600 myaddr.sin6_port = htons(port);
1601 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1602 sizeof(myaddr));
1603 if (port == 0)
1604 break;
1605 if (err == 0) {
1606 transport->srcport = port;
1607 break;
1608 }
1609 last = port;
1610 port = xs_next_srcport(transport, sock, port);
1611 if (port > last)
1612 nloop++;
1613 } while (err == -EADDRINUSE && nloop != 2);
1614 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n",
1615 &myaddr.sin6_addr, port, err ? "failed" : "ok", err);
1616 return err;
1617 }
1618
1619 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1620 static struct lock_class_key xs_key[2];
1621 static struct lock_class_key xs_slock_key[2];
1622
1623 static inline void xs_reclassify_socket4(struct socket *sock)
1624 {
1625 struct sock *sk = sock->sk;
1626
1627 BUG_ON(sock_owned_by_user(sk));
1628 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1629 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1630 }
1631
1632 static inline void xs_reclassify_socket6(struct socket *sock)
1633 {
1634 struct sock *sk = sock->sk;
1635
1636 BUG_ON(sock_owned_by_user(sk));
1637 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1638 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1639 }
1640 #else
1641 static inline void xs_reclassify_socket4(struct socket *sock)
1642 {
1643 }
1644
1645 static inline void xs_reclassify_socket6(struct socket *sock)
1646 {
1647 }
1648 #endif
1649
1650 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1651 {
1652 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1653
1654 if (!transport->inet) {
1655 struct sock *sk = sock->sk;
1656
1657 write_lock_bh(&sk->sk_callback_lock);
1658
1659 xs_save_old_callbacks(transport, sk);
1660
1661 sk->sk_user_data = xprt;
1662 sk->sk_data_ready = xs_udp_data_ready;
1663 sk->sk_write_space = xs_udp_write_space;
1664 sk->sk_error_report = xs_error_report;
1665 sk->sk_no_check = UDP_CSUM_NORCV;
1666 sk->sk_allocation = GFP_ATOMIC;
1667
1668 xprt_set_connected(xprt);
1669
1670 /* Reset to new socket */
1671 transport->sock = sock;
1672 transport->inet = sk;
1673
1674 write_unlock_bh(&sk->sk_callback_lock);
1675 }
1676 xs_udp_do_set_buffer_size(xprt);
1677 }
1678
1679 /**
1680 * xs_udp_connect_worker4 - set up a UDP socket
1681 * @work: RPC transport to connect
1682 *
1683 * Invoked by a work queue tasklet.
1684 */
1685 static void xs_udp_connect_worker4(struct work_struct *work)
1686 {
1687 struct sock_xprt *transport =
1688 container_of(work, struct sock_xprt, connect_worker.work);
1689 struct rpc_xprt *xprt = &transport->xprt;
1690 struct socket *sock = transport->sock;
1691 int err, status = -EIO;
1692
1693 if (xprt->shutdown)
1694 goto out;
1695
1696 /* Start by resetting any existing state */
1697 xs_reset_transport(transport);
1698
1699 err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
1700 if (err < 0) {
1701 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1702 goto out;
1703 }
1704 xs_reclassify_socket4(sock);
1705
1706 if (xs_bind4(transport, sock)) {
1707 sock_release(sock);
1708 goto out;
1709 }
1710
1711 dprintk("RPC: worker connecting xprt %p via %s to "
1712 "%s (port %s)\n", xprt,
1713 xprt->address_strings[RPC_DISPLAY_PROTO],
1714 xprt->address_strings[RPC_DISPLAY_ADDR],
1715 xprt->address_strings[RPC_DISPLAY_PORT]);
1716
1717 xs_udp_finish_connecting(xprt, sock);
1718 status = 0;
1719 out:
1720 xprt_clear_connecting(xprt);
1721 xprt_wake_pending_tasks(xprt, status);
1722 }
1723
1724 /**
1725 * xs_udp_connect_worker6 - set up a UDP socket
1726 * @work: RPC transport to connect
1727 *
1728 * Invoked by a work queue tasklet.
1729 */
1730 static void xs_udp_connect_worker6(struct work_struct *work)
1731 {
1732 struct sock_xprt *transport =
1733 container_of(work, struct sock_xprt, connect_worker.work);
1734 struct rpc_xprt *xprt = &transport->xprt;
1735 struct socket *sock = transport->sock;
1736 int err, status = -EIO;
1737
1738 if (xprt->shutdown)
1739 goto out;
1740
1741 /* Start by resetting any existing state */
1742 xs_reset_transport(transport);
1743
1744 err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
1745 if (err < 0) {
1746 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1747 goto out;
1748 }
1749 xs_reclassify_socket6(sock);
1750
1751 if (xs_bind6(transport, sock) < 0) {
1752 sock_release(sock);
1753 goto out;
1754 }
1755
1756 dprintk("RPC: worker connecting xprt %p via %s to "
1757 "%s (port %s)\n", xprt,
1758 xprt->address_strings[RPC_DISPLAY_PROTO],
1759 xprt->address_strings[RPC_DISPLAY_ADDR],
1760 xprt->address_strings[RPC_DISPLAY_PORT]);
1761
1762 xs_udp_finish_connecting(xprt, sock);
1763 status = 0;
1764 out:
1765 xprt_clear_connecting(xprt);
1766 xprt_wake_pending_tasks(xprt, status);
1767 }
1768
1769 /*
1770 * We need to preserve the port number so the reply cache on the server can
1771 * find our cached RPC replies when we get around to reconnecting.
1772 */
1773 static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1774 {
1775 int result;
1776 struct sockaddr any;
1777
1778 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1779
1780 /*
1781 * Disconnect the transport socket by doing a connect operation
1782 * with AF_UNSPEC. This should return immediately...
1783 */
1784 memset(&any, 0, sizeof(any));
1785 any.sa_family = AF_UNSPEC;
1786 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1787 if (!result)
1788 xs_sock_mark_closed(xprt);
1789 else
1790 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1791 result);
1792 }
1793
1794 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1795 {
1796 unsigned int state = transport->inet->sk_state;
1797
1798 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED)
1799 return;
1800 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT))
1801 return;
1802 xs_abort_connection(xprt, transport);
1803 }
1804
1805 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1806 {
1807 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1808
1809 if (!transport->inet) {
1810 struct sock *sk = sock->sk;
1811
1812 write_lock_bh(&sk->sk_callback_lock);
1813
1814 xs_save_old_callbacks(transport, sk);
1815
1816 sk->sk_user_data = xprt;
1817 sk->sk_data_ready = xs_tcp_data_ready;
1818 sk->sk_state_change = xs_tcp_state_change;
1819 sk->sk_write_space = xs_tcp_write_space;
1820 sk->sk_error_report = xs_error_report;
1821 sk->sk_allocation = GFP_ATOMIC;
1822
1823 /* socket options */
1824 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1825 sock_reset_flag(sk, SOCK_LINGER);
1826 tcp_sk(sk)->linger2 = 0;
1827 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1828
1829 xprt_clear_connected(xprt);
1830
1831 /* Reset to new socket */
1832 transport->sock = sock;
1833 transport->inet = sk;
1834
1835 write_unlock_bh(&sk->sk_callback_lock);
1836 }
1837
1838 if (!xprt_bound(xprt))
1839 return -ENOTCONN;
1840
1841 /* Tell the socket layer to start connecting... */
1842 xprt->stat.connect_count++;
1843 xprt->stat.connect_start = jiffies;
1844 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1845 }
1846
1847 /**
1848 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
1849 * @xprt: RPC transport to connect
1850 * @transport: socket transport to connect
1851 * @create_sock: function to create a socket of the correct type
1852 *
1853 * Invoked by a work queue tasklet.
1854 */
1855 static void xs_tcp_setup_socket(struct rpc_xprt *xprt,
1856 struct sock_xprt *transport,
1857 struct socket *(*create_sock)(struct rpc_xprt *,
1858 struct sock_xprt *))
1859 {
1860 struct socket *sock = transport->sock;
1861 int status = -EIO;
1862
1863 if (xprt->shutdown)
1864 goto out;
1865
1866 if (!sock) {
1867 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1868 sock = create_sock(xprt, transport);
1869 if (IS_ERR(sock)) {
1870 status = PTR_ERR(sock);
1871 goto out;
1872 }
1873 } else {
1874 int abort_and_exit;
1875
1876 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
1877 &xprt->state);
1878 /* "close" the socket, preserving the local port */
1879 xs_tcp_reuse_connection(xprt, transport);
1880
1881 if (abort_and_exit)
1882 goto out_eagain;
1883 }
1884
1885 dprintk("RPC: worker connecting xprt %p via %s to "
1886 "%s (port %s)\n", xprt,
1887 xprt->address_strings[RPC_DISPLAY_PROTO],
1888 xprt->address_strings[RPC_DISPLAY_ADDR],
1889 xprt->address_strings[RPC_DISPLAY_PORT]);
1890
1891 status = xs_tcp_finish_connecting(xprt, sock);
1892 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1893 xprt, -status, xprt_connected(xprt),
1894 sock->sk->sk_state);
1895 switch (status) {
1896 default:
1897 printk("%s: connect returned unhandled error %d\n",
1898 __func__, status);
1899 case -EADDRNOTAVAIL:
1900 /* We're probably in TIME_WAIT. Get rid of existing socket,
1901 * and retry
1902 */
1903 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1904 xprt_force_disconnect(xprt);
1905 break;
1906 case -ECONNREFUSED:
1907 case -ECONNRESET:
1908 case -ENETUNREACH:
1909 /* retry with existing socket, after a delay */
1910 case 0:
1911 case -EINPROGRESS:
1912 case -EALREADY:
1913 xprt_clear_connecting(xprt);
1914 return;
1915 case -EINVAL:
1916 /* Happens, for instance, if the user specified a link
1917 * local IPv6 address without a scope-id.
1918 */
1919 goto out;
1920 }
1921 out_eagain:
1922 status = -EAGAIN;
1923 out:
1924 xprt_clear_connecting(xprt);
1925 xprt_wake_pending_tasks(xprt, status);
1926 }
1927
1928 static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt,
1929 struct sock_xprt *transport)
1930 {
1931 struct socket *sock;
1932 int err;
1933
1934 /* start from scratch */
1935 err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1936 if (err < 0) {
1937 dprintk("RPC: can't create TCP transport socket (%d).\n",
1938 -err);
1939 goto out_err;
1940 }
1941 xs_reclassify_socket4(sock);
1942
1943 if (xs_bind4(transport, sock) < 0) {
1944 sock_release(sock);
1945 goto out_err;
1946 }
1947 return sock;
1948 out_err:
1949 return ERR_PTR(-EIO);
1950 }
1951
1952 /**
1953 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1954 * @work: RPC transport to connect
1955 *
1956 * Invoked by a work queue tasklet.
1957 */
1958 static void xs_tcp_connect_worker4(struct work_struct *work)
1959 {
1960 struct sock_xprt *transport =
1961 container_of(work, struct sock_xprt, connect_worker.work);
1962 struct rpc_xprt *xprt = &transport->xprt;
1963
1964 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4);
1965 }
1966
1967 static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt,
1968 struct sock_xprt *transport)
1969 {
1970 struct socket *sock;
1971 int err;
1972
1973 /* start from scratch */
1974 err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock);
1975 if (err < 0) {
1976 dprintk("RPC: can't create TCP transport socket (%d).\n",
1977 -err);
1978 goto out_err;
1979 }
1980 xs_reclassify_socket6(sock);
1981
1982 if (xs_bind6(transport, sock) < 0) {
1983 sock_release(sock);
1984 goto out_err;
1985 }
1986 return sock;
1987 out_err:
1988 return ERR_PTR(-EIO);
1989 }
1990
1991 /**
1992 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1993 * @work: RPC transport to connect
1994 *
1995 * Invoked by a work queue tasklet.
1996 */
1997 static void xs_tcp_connect_worker6(struct work_struct *work)
1998 {
1999 struct sock_xprt *transport =
2000 container_of(work, struct sock_xprt, connect_worker.work);
2001 struct rpc_xprt *xprt = &transport->xprt;
2002
2003 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6);
2004 }
2005
2006 /**
2007 * xs_connect - connect a socket to a remote endpoint
2008 * @task: address of RPC task that manages state of connect request
2009 *
2010 * TCP: If the remote end dropped the connection, delay reconnecting.
2011 *
2012 * UDP socket connects are synchronous, but we use a work queue anyway
2013 * to guarantee that even unprivileged user processes can set up a
2014 * socket on a privileged port.
2015 *
2016 * If a UDP socket connect fails, the delay behavior here prevents
2017 * retry floods (hard mounts).
2018 */
2019 static void xs_connect(struct rpc_task *task)
2020 {
2021 struct rpc_xprt *xprt = task->tk_xprt;
2022 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2023
2024 if (xprt_test_and_set_connecting(xprt))
2025 return;
2026
2027 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
2028 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2029 "seconds\n",
2030 xprt, xprt->reestablish_timeout / HZ);
2031 queue_delayed_work(rpciod_workqueue,
2032 &transport->connect_worker,
2033 xprt->reestablish_timeout);
2034 xprt->reestablish_timeout <<= 1;
2035 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2036 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2037 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2038 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2039 } else {
2040 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2041 queue_delayed_work(rpciod_workqueue,
2042 &transport->connect_worker, 0);
2043 }
2044 }
2045
2046 static void xs_tcp_connect(struct rpc_task *task)
2047 {
2048 struct rpc_xprt *xprt = task->tk_xprt;
2049
2050 /* Exit if we need to wait for socket shutdown to complete */
2051 if (test_bit(XPRT_CLOSING, &xprt->state))
2052 return;
2053 xs_connect(task);
2054 }
2055
2056 /**
2057 * xs_udp_print_stats - display UDP socket-specifc stats
2058 * @xprt: rpc_xprt struct containing statistics
2059 * @seq: output file
2060 *
2061 */
2062 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2063 {
2064 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2065
2066 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
2067 transport->srcport,
2068 xprt->stat.bind_count,
2069 xprt->stat.sends,
2070 xprt->stat.recvs,
2071 xprt->stat.bad_xids,
2072 xprt->stat.req_u,
2073 xprt->stat.bklog_u);
2074 }
2075
2076 /**
2077 * xs_tcp_print_stats - display TCP socket-specifc stats
2078 * @xprt: rpc_xprt struct containing statistics
2079 * @seq: output file
2080 *
2081 */
2082 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2083 {
2084 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2085 long idle_time = 0;
2086
2087 if (xprt_connected(xprt))
2088 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2089
2090 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
2091 transport->srcport,
2092 xprt->stat.bind_count,
2093 xprt->stat.connect_count,
2094 xprt->stat.connect_time,
2095 idle_time,
2096 xprt->stat.sends,
2097 xprt->stat.recvs,
2098 xprt->stat.bad_xids,
2099 xprt->stat.req_u,
2100 xprt->stat.bklog_u);
2101 }
2102
2103 /*
2104 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2105 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2106 * to use the server side send routines.
2107 */
2108 static void *bc_malloc(struct rpc_task *task, size_t size)
2109 {
2110 struct page *page;
2111 struct rpc_buffer *buf;
2112
2113 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2114 page = alloc_page(GFP_KERNEL);
2115
2116 if (!page)
2117 return NULL;
2118
2119 buf = page_address(page);
2120 buf->len = PAGE_SIZE;
2121
2122 return buf->data;
2123 }
2124
2125 /*
2126 * Free the space allocated in the bc_alloc routine
2127 */
2128 static void bc_free(void *buffer)
2129 {
2130 struct rpc_buffer *buf;
2131
2132 if (!buffer)
2133 return;
2134
2135 buf = container_of(buffer, struct rpc_buffer, data);
2136 free_page((unsigned long)buf);
2137 }
2138
2139 /*
2140 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2141 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2142 */
2143 static int bc_sendto(struct rpc_rqst *req)
2144 {
2145 int len;
2146 struct xdr_buf *xbufp = &req->rq_snd_buf;
2147 struct rpc_xprt *xprt = req->rq_xprt;
2148 struct sock_xprt *transport =
2149 container_of(xprt, struct sock_xprt, xprt);
2150 struct socket *sock = transport->sock;
2151 unsigned long headoff;
2152 unsigned long tailoff;
2153
2154 /*
2155 * Set up the rpc header and record marker stuff
2156 */
2157 xs_encode_tcp_record_marker(xbufp);
2158
2159 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2160 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2161 len = svc_send_common(sock, xbufp,
2162 virt_to_page(xbufp->head[0].iov_base), headoff,
2163 xbufp->tail[0].iov_base, tailoff);
2164
2165 if (len != xbufp->len) {
2166 printk(KERN_NOTICE "Error sending entire callback!\n");
2167 len = -EAGAIN;
2168 }
2169
2170 return len;
2171 }
2172
2173 /*
2174 * The send routine. Borrows from svc_send
2175 */
2176 static int bc_send_request(struct rpc_task *task)
2177 {
2178 struct rpc_rqst *req = task->tk_rqstp;
2179 struct svc_xprt *xprt;
2180 struct svc_sock *svsk;
2181 u32 len;
2182
2183 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2184 /*
2185 * Get the server socket associated with this callback xprt
2186 */
2187 xprt = req->rq_xprt->bc_xprt;
2188 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2189
2190 /*
2191 * Grab the mutex to serialize data as the connection is shared
2192 * with the fore channel
2193 */
2194 if (!mutex_trylock(&xprt->xpt_mutex)) {
2195 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2196 if (!mutex_trylock(&xprt->xpt_mutex))
2197 return -EAGAIN;
2198 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2199 }
2200 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2201 len = -ENOTCONN;
2202 else
2203 len = bc_sendto(req);
2204 mutex_unlock(&xprt->xpt_mutex);
2205
2206 if (len > 0)
2207 len = 0;
2208
2209 return len;
2210 }
2211
2212 /*
2213 * The close routine. Since this is client initiated, we do nothing
2214 */
2215
2216 static void bc_close(struct rpc_xprt *xprt)
2217 {
2218 return;
2219 }
2220
2221 /*
2222 * The xprt destroy routine. Again, because this connection is client
2223 * initiated, we do nothing
2224 */
2225
2226 static void bc_destroy(struct rpc_xprt *xprt)
2227 {
2228 return;
2229 }
2230
2231 static struct rpc_xprt_ops xs_udp_ops = {
2232 .set_buffer_size = xs_udp_set_buffer_size,
2233 .reserve_xprt = xprt_reserve_xprt_cong,
2234 .release_xprt = xprt_release_xprt_cong,
2235 .rpcbind = rpcb_getport_async,
2236 .set_port = xs_set_port,
2237 .connect = xs_connect,
2238 .buf_alloc = rpc_malloc,
2239 .buf_free = rpc_free,
2240 .send_request = xs_udp_send_request,
2241 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2242 .timer = xs_udp_timer,
2243 .release_request = xprt_release_rqst_cong,
2244 .close = xs_close,
2245 .destroy = xs_destroy,
2246 .print_stats = xs_udp_print_stats,
2247 };
2248
2249 static struct rpc_xprt_ops xs_tcp_ops = {
2250 .reserve_xprt = xprt_reserve_xprt,
2251 .release_xprt = xs_tcp_release_xprt,
2252 .rpcbind = rpcb_getport_async,
2253 .set_port = xs_set_port,
2254 .connect = xs_tcp_connect,
2255 .buf_alloc = rpc_malloc,
2256 .buf_free = rpc_free,
2257 .send_request = xs_tcp_send_request,
2258 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2259 #if defined(CONFIG_NFS_V4_1)
2260 .release_request = bc_release_request,
2261 #endif /* CONFIG_NFS_V4_1 */
2262 .close = xs_tcp_close,
2263 .destroy = xs_destroy,
2264 .print_stats = xs_tcp_print_stats,
2265 };
2266
2267 /*
2268 * The rpc_xprt_ops for the server backchannel
2269 */
2270
2271 static struct rpc_xprt_ops bc_tcp_ops = {
2272 .reserve_xprt = xprt_reserve_xprt,
2273 .release_xprt = xprt_release_xprt,
2274 .buf_alloc = bc_malloc,
2275 .buf_free = bc_free,
2276 .send_request = bc_send_request,
2277 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2278 .close = bc_close,
2279 .destroy = bc_destroy,
2280 .print_stats = xs_tcp_print_stats,
2281 };
2282
2283 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2284 unsigned int slot_table_size)
2285 {
2286 struct rpc_xprt *xprt;
2287 struct sock_xprt *new;
2288
2289 if (args->addrlen > sizeof(xprt->addr)) {
2290 dprintk("RPC: xs_setup_xprt: address too large\n");
2291 return ERR_PTR(-EBADF);
2292 }
2293
2294 new = kzalloc(sizeof(*new), GFP_KERNEL);
2295 if (new == NULL) {
2296 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2297 "rpc_xprt\n");
2298 return ERR_PTR(-ENOMEM);
2299 }
2300 xprt = &new->xprt;
2301
2302 xprt->max_reqs = slot_table_size;
2303 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
2304 if (xprt->slot == NULL) {
2305 kfree(xprt);
2306 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
2307 "table\n");
2308 return ERR_PTR(-ENOMEM);
2309 }
2310
2311 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2312 xprt->addrlen = args->addrlen;
2313 if (args->srcaddr)
2314 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2315
2316 return xprt;
2317 }
2318
2319 static const struct rpc_timeout xs_udp_default_timeout = {
2320 .to_initval = 5 * HZ,
2321 .to_maxval = 30 * HZ,
2322 .to_increment = 5 * HZ,
2323 .to_retries = 5,
2324 };
2325
2326 /**
2327 * xs_setup_udp - Set up transport to use a UDP socket
2328 * @args: rpc transport creation arguments
2329 *
2330 */
2331 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2332 {
2333 struct sockaddr *addr = args->dstaddr;
2334 struct rpc_xprt *xprt;
2335 struct sock_xprt *transport;
2336
2337 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
2338 if (IS_ERR(xprt))
2339 return xprt;
2340 transport = container_of(xprt, struct sock_xprt, xprt);
2341
2342 xprt->prot = IPPROTO_UDP;
2343 xprt->tsh_size = 0;
2344 /* XXX: header size can vary due to auth type, IPv6, etc. */
2345 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2346
2347 xprt->bind_timeout = XS_BIND_TO;
2348 xprt->connect_timeout = XS_UDP_CONN_TO;
2349 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2350 xprt->idle_timeout = XS_IDLE_DISC_TO;
2351
2352 xprt->ops = &xs_udp_ops;
2353
2354 xprt->timeout = &xs_udp_default_timeout;
2355
2356 switch (addr->sa_family) {
2357 case AF_INET:
2358 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2359 xprt_set_bound(xprt);
2360
2361 INIT_DELAYED_WORK(&transport->connect_worker,
2362 xs_udp_connect_worker4);
2363 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2364 break;
2365 case AF_INET6:
2366 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2367 xprt_set_bound(xprt);
2368
2369 INIT_DELAYED_WORK(&transport->connect_worker,
2370 xs_udp_connect_worker6);
2371 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2372 break;
2373 default:
2374 kfree(xprt);
2375 return ERR_PTR(-EAFNOSUPPORT);
2376 }
2377
2378 if (xprt_bound(xprt))
2379 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2380 xprt->address_strings[RPC_DISPLAY_ADDR],
2381 xprt->address_strings[RPC_DISPLAY_PORT],
2382 xprt->address_strings[RPC_DISPLAY_PROTO]);
2383 else
2384 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2385 xprt->address_strings[RPC_DISPLAY_ADDR],
2386 xprt->address_strings[RPC_DISPLAY_PROTO]);
2387
2388 if (try_module_get(THIS_MODULE))
2389 return xprt;
2390
2391 kfree(xprt->slot);
2392 kfree(xprt);
2393 return ERR_PTR(-EINVAL);
2394 }
2395
2396 static const struct rpc_timeout xs_tcp_default_timeout = {
2397 .to_initval = 60 * HZ,
2398 .to_maxval = 60 * HZ,
2399 .to_retries = 2,
2400 };
2401
2402 /**
2403 * xs_setup_tcp - Set up transport to use a TCP socket
2404 * @args: rpc transport creation arguments
2405 *
2406 */
2407 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2408 {
2409 struct sockaddr *addr = args->dstaddr;
2410 struct rpc_xprt *xprt;
2411 struct sock_xprt *transport;
2412
2413 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2414 if (IS_ERR(xprt))
2415 return xprt;
2416 transport = container_of(xprt, struct sock_xprt, xprt);
2417
2418 xprt->prot = IPPROTO_TCP;
2419 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2420 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2421
2422 xprt->bind_timeout = XS_BIND_TO;
2423 xprt->connect_timeout = XS_TCP_CONN_TO;
2424 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2425 xprt->idle_timeout = XS_IDLE_DISC_TO;
2426
2427 xprt->ops = &xs_tcp_ops;
2428 xprt->timeout = &xs_tcp_default_timeout;
2429
2430 switch (addr->sa_family) {
2431 case AF_INET:
2432 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2433 xprt_set_bound(xprt);
2434
2435 INIT_DELAYED_WORK(&transport->connect_worker,
2436 xs_tcp_connect_worker4);
2437 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2438 break;
2439 case AF_INET6:
2440 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2441 xprt_set_bound(xprt);
2442
2443 INIT_DELAYED_WORK(&transport->connect_worker,
2444 xs_tcp_connect_worker6);
2445 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2446 break;
2447 default:
2448 kfree(xprt);
2449 return ERR_PTR(-EAFNOSUPPORT);
2450 }
2451
2452 if (xprt_bound(xprt))
2453 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2454 xprt->address_strings[RPC_DISPLAY_ADDR],
2455 xprt->address_strings[RPC_DISPLAY_PORT],
2456 xprt->address_strings[RPC_DISPLAY_PROTO]);
2457 else
2458 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2459 xprt->address_strings[RPC_DISPLAY_ADDR],
2460 xprt->address_strings[RPC_DISPLAY_PROTO]);
2461
2462
2463 if (try_module_get(THIS_MODULE))
2464 return xprt;
2465
2466 kfree(xprt->slot);
2467 kfree(xprt);
2468 return ERR_PTR(-EINVAL);
2469 }
2470
2471 /**
2472 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2473 * @args: rpc transport creation arguments
2474 *
2475 */
2476 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2477 {
2478 struct sockaddr *addr = args->dstaddr;
2479 struct rpc_xprt *xprt;
2480 struct sock_xprt *transport;
2481 struct svc_sock *bc_sock;
2482
2483 if (!args->bc_xprt)
2484 ERR_PTR(-EINVAL);
2485
2486 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2487 if (IS_ERR(xprt))
2488 return xprt;
2489 transport = container_of(xprt, struct sock_xprt, xprt);
2490
2491 xprt->prot = IPPROTO_TCP;
2492 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2493 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2494 xprt->timeout = &xs_tcp_default_timeout;
2495
2496 /* backchannel */
2497 xprt_set_bound(xprt);
2498 xprt->bind_timeout = 0;
2499 xprt->connect_timeout = 0;
2500 xprt->reestablish_timeout = 0;
2501 xprt->idle_timeout = 0;
2502
2503 /*
2504 * The backchannel uses the same socket connection as the
2505 * forechannel
2506 */
2507 xprt->bc_xprt = args->bc_xprt;
2508 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2509 bc_sock->sk_bc_xprt = xprt;
2510 transport->sock = bc_sock->sk_sock;
2511 transport->inet = bc_sock->sk_sk;
2512
2513 xprt->ops = &bc_tcp_ops;
2514
2515 switch (addr->sa_family) {
2516 case AF_INET:
2517 xs_format_peer_addresses(xprt, "tcp",
2518 RPCBIND_NETID_TCP);
2519 break;
2520 case AF_INET6:
2521 xs_format_peer_addresses(xprt, "tcp",
2522 RPCBIND_NETID_TCP6);
2523 break;
2524 default:
2525 kfree(xprt);
2526 return ERR_PTR(-EAFNOSUPPORT);
2527 }
2528
2529 if (xprt_bound(xprt))
2530 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2531 xprt->address_strings[RPC_DISPLAY_ADDR],
2532 xprt->address_strings[RPC_DISPLAY_PORT],
2533 xprt->address_strings[RPC_DISPLAY_PROTO]);
2534 else
2535 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2536 xprt->address_strings[RPC_DISPLAY_ADDR],
2537 xprt->address_strings[RPC_DISPLAY_PROTO]);
2538
2539 /*
2540 * Since we don't want connections for the backchannel, we set
2541 * the xprt status to connected
2542 */
2543 xprt_set_connected(xprt);
2544
2545
2546 if (try_module_get(THIS_MODULE))
2547 return xprt;
2548 kfree(xprt->slot);
2549 kfree(xprt);
2550 return ERR_PTR(-EINVAL);
2551 }
2552
2553 static struct xprt_class xs_udp_transport = {
2554 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2555 .name = "udp",
2556 .owner = THIS_MODULE,
2557 .ident = XPRT_TRANSPORT_UDP,
2558 .setup = xs_setup_udp,
2559 };
2560
2561 static struct xprt_class xs_tcp_transport = {
2562 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2563 .name = "tcp",
2564 .owner = THIS_MODULE,
2565 .ident = XPRT_TRANSPORT_TCP,
2566 .setup = xs_setup_tcp,
2567 };
2568
2569 static struct xprt_class xs_bc_tcp_transport = {
2570 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2571 .name = "tcp NFSv4.1 backchannel",
2572 .owner = THIS_MODULE,
2573 .ident = XPRT_TRANSPORT_BC_TCP,
2574 .setup = xs_setup_bc_tcp,
2575 };
2576
2577 /**
2578 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2579 *
2580 */
2581 int init_socket_xprt(void)
2582 {
2583 #ifdef RPC_DEBUG
2584 if (!sunrpc_table_header)
2585 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2586 #endif
2587
2588 xprt_register_transport(&xs_udp_transport);
2589 xprt_register_transport(&xs_tcp_transport);
2590 xprt_register_transport(&xs_bc_tcp_transport);
2591
2592 return 0;
2593 }
2594
2595 /**
2596 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2597 *
2598 */
2599 void cleanup_socket_xprt(void)
2600 {
2601 #ifdef RPC_DEBUG
2602 if (sunrpc_table_header) {
2603 unregister_sysctl_table(sunrpc_table_header);
2604 sunrpc_table_header = NULL;
2605 }
2606 #endif
2607
2608 xprt_unregister_transport(&xs_udp_transport);
2609 xprt_unregister_transport(&xs_tcp_transport);
2610 xprt_unregister_transport(&xs_bc_tcp_transport);
2611 }
2612
2613 static int param_set_uint_minmax(const char *val, struct kernel_param *kp,
2614 unsigned int min, unsigned int max)
2615 {
2616 unsigned long num;
2617 int ret;
2618
2619 if (!val)
2620 return -EINVAL;
2621 ret = strict_strtoul(val, 0, &num);
2622 if (ret == -EINVAL || num < min || num > max)
2623 return -EINVAL;
2624 *((unsigned int *)kp->arg) = num;
2625 return 0;
2626 }
2627
2628 static int param_set_portnr(const char *val, struct kernel_param *kp)
2629 {
2630 return param_set_uint_minmax(val, kp,
2631 RPC_MIN_RESVPORT,
2632 RPC_MAX_RESVPORT);
2633 }
2634
2635 static int param_get_portnr(char *buffer, struct kernel_param *kp)
2636 {
2637 return param_get_uint(buffer, kp);
2638 }
2639 #define param_check_portnr(name, p) \
2640 __param_check(name, p, unsigned int);
2641
2642 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
2643 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
2644
2645 static int param_set_slot_table_size(const char *val, struct kernel_param *kp)
2646 {
2647 return param_set_uint_minmax(val, kp,
2648 RPC_MIN_SLOT_TABLE,
2649 RPC_MAX_SLOT_TABLE);
2650 }
2651
2652 static int param_get_slot_table_size(char *buffer, struct kernel_param *kp)
2653 {
2654 return param_get_uint(buffer, kp);
2655 }
2656 #define param_check_slot_table_size(name, p) \
2657 __param_check(name, p, unsigned int);
2658
2659 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
2660 slot_table_size, 0644);
2661 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
2662 slot_table_size, 0644);
2663
Support for the Chinese Samsung S3C2440 based development boards