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ARM: S5P6440: Add Touchscreen support for S5P6440
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / sunrpc / xprtsock.c
blob9847c30b5001ce5d4e3cd9e1b5828e80cdd7ef24
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 snprintf(buf, sizeof(buf), "%08x", ntohl(sin->sin_addr.s_addr));
301 break;
302 case AF_INET6:
303 sin6 = xs_addr_in6(xprt);
304 snprintf(buf, sizeof(buf), "%pi6", &sin6->sin6_addr);
305 break;
306 default:
307 BUG();
308 }
309 xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = kstrdup(buf, GFP_KERNEL);
310 }
311
312 static void xs_format_common_peer_ports(struct rpc_xprt *xprt)
313 {
314 struct sockaddr *sap = xs_addr(xprt);
315 char buf[128];
316
317 snprintf(buf, sizeof(buf), "%u", rpc_get_port(sap));
318 xprt->address_strings[RPC_DISPLAY_PORT] = kstrdup(buf, GFP_KERNEL);
319
320 snprintf(buf, sizeof(buf), "%4hx", rpc_get_port(sap));
321 xprt->address_strings[RPC_DISPLAY_HEX_PORT] = kstrdup(buf, GFP_KERNEL);
322 }
323
324 static void xs_format_peer_addresses(struct rpc_xprt *xprt,
325 const char *protocol,
326 const char *netid)
327 {
328 xprt->address_strings[RPC_DISPLAY_PROTO] = protocol;
329 xprt->address_strings[RPC_DISPLAY_NETID] = netid;
330 xs_format_common_peer_addresses(xprt);
331 xs_format_common_peer_ports(xprt);
332 }
333
334 static void xs_update_peer_port(struct rpc_xprt *xprt)
335 {
336 kfree(xprt->address_strings[RPC_DISPLAY_HEX_PORT]);
337 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
338
339 xs_format_common_peer_ports(xprt);
340 }
341
342 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
343 {
344 unsigned int i;
345
346 for (i = 0; i < RPC_DISPLAY_MAX; i++)
347 switch (i) {
348 case RPC_DISPLAY_PROTO:
349 case RPC_DISPLAY_NETID:
350 continue;
351 default:
352 kfree(xprt->address_strings[i]);
353 }
354 }
355
356 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
357
358 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
359 {
360 struct msghdr msg = {
361 .msg_name = addr,
362 .msg_namelen = addrlen,
363 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
364 };
365 struct kvec iov = {
366 .iov_base = vec->iov_base + base,
367 .iov_len = vec->iov_len - base,
368 };
369
370 if (iov.iov_len != 0)
371 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
372 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
373 }
374
375 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
376 {
377 struct page **ppage;
378 unsigned int remainder;
379 int err, sent = 0;
380
381 remainder = xdr->page_len - base;
382 base += xdr->page_base;
383 ppage = xdr->pages + (base >> PAGE_SHIFT);
384 base &= ~PAGE_MASK;
385 for(;;) {
386 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
387 int flags = XS_SENDMSG_FLAGS;
388
389 remainder -= len;
390 if (remainder != 0 || more)
391 flags |= MSG_MORE;
392 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
393 if (remainder == 0 || err != len)
394 break;
395 sent += err;
396 ppage++;
397 base = 0;
398 }
399 if (sent == 0)
400 return err;
401 if (err > 0)
402 sent += err;
403 return sent;
404 }
405
406 /**
407 * xs_sendpages - write pages directly to a socket
408 * @sock: socket to send on
409 * @addr: UDP only -- address of destination
410 * @addrlen: UDP only -- length of destination address
411 * @xdr: buffer containing this request
412 * @base: starting position in the buffer
413 *
414 */
415 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
416 {
417 unsigned int remainder = xdr->len - base;
418 int err, sent = 0;
419
420 if (unlikely(!sock))
421 return -ENOTSOCK;
422
423 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
424 if (base != 0) {
425 addr = NULL;
426 addrlen = 0;
427 }
428
429 if (base < xdr->head[0].iov_len || addr != NULL) {
430 unsigned int len = xdr->head[0].iov_len - base;
431 remainder -= len;
432 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
433 if (remainder == 0 || err != len)
434 goto out;
435 sent += err;
436 base = 0;
437 } else
438 base -= xdr->head[0].iov_len;
439
440 if (base < xdr->page_len) {
441 unsigned int len = xdr->page_len - base;
442 remainder -= len;
443 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
444 if (remainder == 0 || err != len)
445 goto out;
446 sent += err;
447 base = 0;
448 } else
449 base -= xdr->page_len;
450
451 if (base >= xdr->tail[0].iov_len)
452 return sent;
453 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
454 out:
455 if (sent == 0)
456 return err;
457 if (err > 0)
458 sent += err;
459 return sent;
460 }
461
462 static void xs_nospace_callback(struct rpc_task *task)
463 {
464 struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt);
465
466 transport->inet->sk_write_pending--;
467 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
468 }
469
470 /**
471 * xs_nospace - place task on wait queue if transmit was incomplete
472 * @task: task to put to sleep
473 *
474 */
475 static int xs_nospace(struct rpc_task *task)
476 {
477 struct rpc_rqst *req = task->tk_rqstp;
478 struct rpc_xprt *xprt = req->rq_xprt;
479 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
480 int ret = 0;
481
482 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
483 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
484 req->rq_slen);
485
486 /* Protect against races with write_space */
487 spin_lock_bh(&xprt->transport_lock);
488
489 /* Don't race with disconnect */
490 if (xprt_connected(xprt)) {
491 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
492 ret = -EAGAIN;
493 /*
494 * Notify TCP that we're limited by the application
495 * window size
496 */
497 set_bit(SOCK_NOSPACE, &transport->sock->flags);
498 transport->inet->sk_write_pending++;
499 /* ...and wait for more buffer space */
500 xprt_wait_for_buffer_space(task, xs_nospace_callback);
501 }
502 } else {
503 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
504 ret = -ENOTCONN;
505 }
506
507 spin_unlock_bh(&xprt->transport_lock);
508 return ret;
509 }
510
511 /**
512 * xs_udp_send_request - write an RPC request to a UDP socket
513 * @task: address of RPC task that manages the state of an RPC request
514 *
515 * Return values:
516 * 0: The request has been sent
517 * EAGAIN: The socket was blocked, please call again later to
518 * complete the request
519 * ENOTCONN: Caller needs to invoke connect logic then call again
520 * other: Some other error occured, the request was not sent
521 */
522 static int xs_udp_send_request(struct rpc_task *task)
523 {
524 struct rpc_rqst *req = task->tk_rqstp;
525 struct rpc_xprt *xprt = req->rq_xprt;
526 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
527 struct xdr_buf *xdr = &req->rq_snd_buf;
528 int status;
529
530 xs_pktdump("packet data:",
531 req->rq_svec->iov_base,
532 req->rq_svec->iov_len);
533
534 if (!xprt_bound(xprt))
535 return -ENOTCONN;
536 status = xs_sendpages(transport->sock,
537 xs_addr(xprt),
538 xprt->addrlen, xdr,
539 req->rq_bytes_sent);
540
541 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
542 xdr->len - req->rq_bytes_sent, status);
543
544 if (status >= 0) {
545 task->tk_bytes_sent += status;
546 if (status >= req->rq_slen)
547 return 0;
548 /* Still some bytes left; set up for a retry later. */
549 status = -EAGAIN;
550 }
551
552 switch (status) {
553 case -ENOTSOCK:
554 status = -ENOTCONN;
555 /* Should we call xs_close() here? */
556 break;
557 case -EAGAIN:
558 status = xs_nospace(task);
559 break;
560 default:
561 dprintk("RPC: sendmsg returned unrecognized error %d\n",
562 -status);
563 case -ENETUNREACH:
564 case -EPIPE:
565 case -ECONNREFUSED:
566 /* When the server has died, an ICMP port unreachable message
567 * prompts ECONNREFUSED. */
568 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
569 }
570
571 return status;
572 }
573
574 /**
575 * xs_tcp_shutdown - gracefully shut down a TCP socket
576 * @xprt: transport
577 *
578 * Initiates a graceful shutdown of the TCP socket by calling the
579 * equivalent of shutdown(SHUT_WR);
580 */
581 static void xs_tcp_shutdown(struct rpc_xprt *xprt)
582 {
583 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
584 struct socket *sock = transport->sock;
585
586 if (sock != NULL)
587 kernel_sock_shutdown(sock, SHUT_WR);
588 }
589
590 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
591 {
592 u32 reclen = buf->len - sizeof(rpc_fraghdr);
593 rpc_fraghdr *base = buf->head[0].iov_base;
594 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
595 }
596
597 /**
598 * xs_tcp_send_request - write an RPC request to a TCP socket
599 * @task: address of RPC task that manages the state of an RPC request
600 *
601 * Return values:
602 * 0: The request has been sent
603 * EAGAIN: The socket was blocked, please call again later to
604 * complete the request
605 * ENOTCONN: Caller needs to invoke connect logic then call again
606 * other: Some other error occured, the request was not sent
607 *
608 * XXX: In the case of soft timeouts, should we eventually give up
609 * if sendmsg is not able to make progress?
610 */
611 static int xs_tcp_send_request(struct rpc_task *task)
612 {
613 struct rpc_rqst *req = task->tk_rqstp;
614 struct rpc_xprt *xprt = req->rq_xprt;
615 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
616 struct xdr_buf *xdr = &req->rq_snd_buf;
617 int status;
618
619 xs_encode_tcp_record_marker(&req->rq_snd_buf);
620
621 xs_pktdump("packet data:",
622 req->rq_svec->iov_base,
623 req->rq_svec->iov_len);
624
625 /* Continue transmitting the packet/record. We must be careful
626 * to cope with writespace callbacks arriving _after_ we have
627 * called sendmsg(). */
628 while (1) {
629 status = xs_sendpages(transport->sock,
630 NULL, 0, xdr, req->rq_bytes_sent);
631
632 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
633 xdr->len - req->rq_bytes_sent, status);
634
635 if (unlikely(status < 0))
636 break;
637
638 /* If we've sent the entire packet, immediately
639 * reset the count of bytes sent. */
640 req->rq_bytes_sent += status;
641 task->tk_bytes_sent += status;
642 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
643 req->rq_bytes_sent = 0;
644 return 0;
645 }
646
647 if (status != 0)
648 continue;
649 status = -EAGAIN;
650 break;
651 }
652
653 switch (status) {
654 case -ENOTSOCK:
655 status = -ENOTCONN;
656 /* Should we call xs_close() here? */
657 break;
658 case -EAGAIN:
659 status = xs_nospace(task);
660 break;
661 default:
662 dprintk("RPC: sendmsg returned unrecognized error %d\n",
663 -status);
664 case -ECONNRESET:
665 case -EPIPE:
666 xs_tcp_shutdown(xprt);
667 case -ECONNREFUSED:
668 case -ENOTCONN:
669 clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags);
670 }
671
672 return status;
673 }
674
675 /**
676 * xs_tcp_release_xprt - clean up after a tcp transmission
677 * @xprt: transport
678 * @task: rpc task
679 *
680 * This cleans up if an error causes us to abort the transmission of a request.
681 * In this case, the socket may need to be reset in order to avoid confusing
682 * the server.
683 */
684 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
685 {
686 struct rpc_rqst *req;
687
688 if (task != xprt->snd_task)
689 return;
690 if (task == NULL)
691 goto out_release;
692 req = task->tk_rqstp;
693 if (req->rq_bytes_sent == 0)
694 goto out_release;
695 if (req->rq_bytes_sent == req->rq_snd_buf.len)
696 goto out_release;
697 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
698 out_release:
699 xprt_release_xprt(xprt, task);
700 }
701
702 static void xs_save_old_callbacks(struct sock_xprt *transport, struct sock *sk)
703 {
704 transport->old_data_ready = sk->sk_data_ready;
705 transport->old_state_change = sk->sk_state_change;
706 transport->old_write_space = sk->sk_write_space;
707 transport->old_error_report = sk->sk_error_report;
708 }
709
710 static void xs_restore_old_callbacks(struct sock_xprt *transport, struct sock *sk)
711 {
712 sk->sk_data_ready = transport->old_data_ready;
713 sk->sk_state_change = transport->old_state_change;
714 sk->sk_write_space = transport->old_write_space;
715 sk->sk_error_report = transport->old_error_report;
716 }
717
718 static void xs_reset_transport(struct sock_xprt *transport)
719 {
720 struct socket *sock = transport->sock;
721 struct sock *sk = transport->inet;
722
723 if (sk == NULL)
724 return;
725
726 write_lock_bh(&sk->sk_callback_lock);
727 transport->inet = NULL;
728 transport->sock = NULL;
729
730 sk->sk_user_data = NULL;
731
732 xs_restore_old_callbacks(transport, sk);
733 write_unlock_bh(&sk->sk_callback_lock);
734
735 sk->sk_no_check = 0;
736
737 sock_release(sock);
738 }
739
740 /**
741 * xs_close - close a socket
742 * @xprt: transport
743 *
744 * This is used when all requests are complete; ie, no DRC state remains
745 * on the server we want to save.
746 *
747 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
748 * xs_reset_transport() zeroing the socket from underneath a writer.
749 */
750 static void xs_close(struct rpc_xprt *xprt)
751 {
752 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
753
754 dprintk("RPC: xs_close xprt %p\n", xprt);
755
756 xs_reset_transport(transport);
757 xprt->reestablish_timeout = 0;
758
759 smp_mb__before_clear_bit();
760 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
761 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
762 clear_bit(XPRT_CLOSING, &xprt->state);
763 smp_mb__after_clear_bit();
764 xprt_disconnect_done(xprt);
765 }
766
767 static void xs_tcp_close(struct rpc_xprt *xprt)
768 {
769 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
770 xs_close(xprt);
771 else
772 xs_tcp_shutdown(xprt);
773 }
774
775 /**
776 * xs_destroy - prepare to shutdown a transport
777 * @xprt: doomed transport
778 *
779 */
780 static void xs_destroy(struct rpc_xprt *xprt)
781 {
782 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
783
784 dprintk("RPC: xs_destroy xprt %p\n", xprt);
785
786 cancel_rearming_delayed_work(&transport->connect_worker);
787
788 xs_close(xprt);
789 xs_free_peer_addresses(xprt);
790 kfree(xprt->slot);
791 kfree(xprt);
792 module_put(THIS_MODULE);
793 }
794
795 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
796 {
797 return (struct rpc_xprt *) sk->sk_user_data;
798 }
799
800 /**
801 * xs_udp_data_ready - "data ready" callback for UDP sockets
802 * @sk: socket with data to read
803 * @len: how much data to read
804 *
805 */
806 static void xs_udp_data_ready(struct sock *sk, int len)
807 {
808 struct rpc_task *task;
809 struct rpc_xprt *xprt;
810 struct rpc_rqst *rovr;
811 struct sk_buff *skb;
812 int err, repsize, copied;
813 u32 _xid;
814 __be32 *xp;
815
816 read_lock(&sk->sk_callback_lock);
817 dprintk("RPC: xs_udp_data_ready...\n");
818 if (!(xprt = xprt_from_sock(sk)))
819 goto out;
820
821 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
822 goto out;
823
824 if (xprt->shutdown)
825 goto dropit;
826
827 repsize = skb->len - sizeof(struct udphdr);
828 if (repsize < 4) {
829 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
830 goto dropit;
831 }
832
833 /* Copy the XID from the skb... */
834 xp = skb_header_pointer(skb, sizeof(struct udphdr),
835 sizeof(_xid), &_xid);
836 if (xp == NULL)
837 goto dropit;
838
839 /* Look up and lock the request corresponding to the given XID */
840 spin_lock(&xprt->transport_lock);
841 rovr = xprt_lookup_rqst(xprt, *xp);
842 if (!rovr)
843 goto out_unlock;
844 task = rovr->rq_task;
845
846 if ((copied = rovr->rq_private_buf.buflen) > repsize)
847 copied = repsize;
848
849 /* Suck it into the iovec, verify checksum if not done by hw. */
850 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) {
851 UDPX_INC_STATS_BH(sk, UDP_MIB_INERRORS);
852 goto out_unlock;
853 }
854
855 UDPX_INC_STATS_BH(sk, UDP_MIB_INDATAGRAMS);
856
857 /* Something worked... */
858 dst_confirm(skb_dst(skb));
859
860 xprt_adjust_cwnd(task, copied);
861 xprt_update_rtt(task);
862 xprt_complete_rqst(task, copied);
863
864 out_unlock:
865 spin_unlock(&xprt->transport_lock);
866 dropit:
867 skb_free_datagram(sk, skb);
868 out:
869 read_unlock(&sk->sk_callback_lock);
870 }
871
872 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
873 {
874 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
875 size_t len, used;
876 char *p;
877
878 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
879 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
880 used = xdr_skb_read_bits(desc, p, len);
881 transport->tcp_offset += used;
882 if (used != len)
883 return;
884
885 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
886 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
887 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
888 else
889 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
890 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
891
892 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
893 transport->tcp_offset = 0;
894
895 /* Sanity check of the record length */
896 if (unlikely(transport->tcp_reclen < 8)) {
897 dprintk("RPC: invalid TCP record fragment length\n");
898 xprt_force_disconnect(xprt);
899 return;
900 }
901 dprintk("RPC: reading TCP record fragment of length %d\n",
902 transport->tcp_reclen);
903 }
904
905 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
906 {
907 if (transport->tcp_offset == transport->tcp_reclen) {
908 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
909 transport->tcp_offset = 0;
910 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
911 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
912 transport->tcp_flags |= TCP_RCV_COPY_XID;
913 transport->tcp_copied = 0;
914 }
915 }
916 }
917
918 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
919 {
920 size_t len, used;
921 char *p;
922
923 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
924 dprintk("RPC: reading XID (%Zu bytes)\n", len);
925 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
926 used = xdr_skb_read_bits(desc, p, len);
927 transport->tcp_offset += used;
928 if (used != len)
929 return;
930 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
931 transport->tcp_flags |= TCP_RCV_READ_CALLDIR;
932 transport->tcp_copied = 4;
933 dprintk("RPC: reading %s XID %08x\n",
934 (transport->tcp_flags & TCP_RPC_REPLY) ? "reply for"
935 : "request with",
936 ntohl(transport->tcp_xid));
937 xs_tcp_check_fraghdr(transport);
938 }
939
940 static inline void xs_tcp_read_calldir(struct sock_xprt *transport,
941 struct xdr_skb_reader *desc)
942 {
943 size_t len, used;
944 u32 offset;
945 __be32 calldir;
946
947 /*
948 * We want transport->tcp_offset to be 8 at the end of this routine
949 * (4 bytes for the xid and 4 bytes for the call/reply flag).
950 * When this function is called for the first time,
951 * transport->tcp_offset is 4 (after having already read the xid).
952 */
953 offset = transport->tcp_offset - sizeof(transport->tcp_xid);
954 len = sizeof(calldir) - offset;
955 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len);
956 used = xdr_skb_read_bits(desc, &calldir, len);
957 transport->tcp_offset += used;
958 if (used != len)
959 return;
960 transport->tcp_flags &= ~TCP_RCV_READ_CALLDIR;
961 transport->tcp_flags |= TCP_RCV_COPY_CALLDIR;
962 transport->tcp_flags |= TCP_RCV_COPY_DATA;
963 /*
964 * We don't yet have the XDR buffer, so we will write the calldir
965 * out after we get the buffer from the 'struct rpc_rqst'
966 */
967 if (ntohl(calldir) == RPC_REPLY)
968 transport->tcp_flags |= TCP_RPC_REPLY;
969 else
970 transport->tcp_flags &= ~TCP_RPC_REPLY;
971 dprintk("RPC: reading %s CALL/REPLY flag %08x\n",
972 (transport->tcp_flags & TCP_RPC_REPLY) ?
973 "reply for" : "request with", calldir);
974 xs_tcp_check_fraghdr(transport);
975 }
976
977 static inline void xs_tcp_read_common(struct rpc_xprt *xprt,
978 struct xdr_skb_reader *desc,
979 struct rpc_rqst *req)
980 {
981 struct sock_xprt *transport =
982 container_of(xprt, struct sock_xprt, xprt);
983 struct xdr_buf *rcvbuf;
984 size_t len;
985 ssize_t r;
986
987 rcvbuf = &req->rq_private_buf;
988
989 if (transport->tcp_flags & TCP_RCV_COPY_CALLDIR) {
990 /*
991 * Save the RPC direction in the XDR buffer
992 */
993 __be32 calldir = transport->tcp_flags & TCP_RPC_REPLY ?
994 htonl(RPC_REPLY) : 0;
995
996 memcpy(rcvbuf->head[0].iov_base + transport->tcp_copied,
997 &calldir, sizeof(calldir));
998 transport->tcp_copied += sizeof(calldir);
999 transport->tcp_flags &= ~TCP_RCV_COPY_CALLDIR;
1000 }
1001
1002 len = desc->count;
1003 if (len > transport->tcp_reclen - transport->tcp_offset) {
1004 struct xdr_skb_reader my_desc;
1005
1006 len = transport->tcp_reclen - transport->tcp_offset;
1007 memcpy(&my_desc, desc, sizeof(my_desc));
1008 my_desc.count = len;
1009 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1010 &my_desc, xdr_skb_read_bits);
1011 desc->count -= r;
1012 desc->offset += r;
1013 } else
1014 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
1015 desc, xdr_skb_read_bits);
1016
1017 if (r > 0) {
1018 transport->tcp_copied += r;
1019 transport->tcp_offset += r;
1020 }
1021 if (r != len) {
1022 /* Error when copying to the receive buffer,
1023 * usually because we weren't able to allocate
1024 * additional buffer pages. All we can do now
1025 * is turn off TCP_RCV_COPY_DATA, so the request
1026 * will not receive any additional updates,
1027 * and time out.
1028 * Any remaining data from this record will
1029 * be discarded.
1030 */
1031 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1032 dprintk("RPC: XID %08x truncated request\n",
1033 ntohl(transport->tcp_xid));
1034 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1035 "tcp_offset = %u, tcp_reclen = %u\n",
1036 xprt, transport->tcp_copied,
1037 transport->tcp_offset, transport->tcp_reclen);
1038 return;
1039 }
1040
1041 dprintk("RPC: XID %08x read %Zd bytes\n",
1042 ntohl(transport->tcp_xid), r);
1043 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1044 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
1045 transport->tcp_offset, transport->tcp_reclen);
1046
1047 if (transport->tcp_copied == req->rq_private_buf.buflen)
1048 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1049 else if (transport->tcp_offset == transport->tcp_reclen) {
1050 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
1051 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1052 }
1053
1054 return;
1055 }
1056
1057 /*
1058 * Finds the request corresponding to the RPC xid and invokes the common
1059 * tcp read code to read the data.
1060 */
1061 static inline int xs_tcp_read_reply(struct rpc_xprt *xprt,
1062 struct xdr_skb_reader *desc)
1063 {
1064 struct sock_xprt *transport =
1065 container_of(xprt, struct sock_xprt, xprt);
1066 struct rpc_rqst *req;
1067
1068 dprintk("RPC: read reply XID %08x\n", ntohl(transport->tcp_xid));
1069
1070 /* Find and lock the request corresponding to this xid */
1071 spin_lock(&xprt->transport_lock);
1072 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
1073 if (!req) {
1074 dprintk("RPC: XID %08x request not found!\n",
1075 ntohl(transport->tcp_xid));
1076 spin_unlock(&xprt->transport_lock);
1077 return -1;
1078 }
1079
1080 xs_tcp_read_common(xprt, desc, req);
1081
1082 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
1083 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
1084
1085 spin_unlock(&xprt->transport_lock);
1086 return 0;
1087 }
1088
1089 #if defined(CONFIG_NFS_V4_1)
1090 /*
1091 * Obtains an rpc_rqst previously allocated and invokes the common
1092 * tcp read code to read the data. The result is placed in the callback
1093 * queue.
1094 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1095 * connection and return -1.
1096 */
1097 static inline int xs_tcp_read_callback(struct rpc_xprt *xprt,
1098 struct xdr_skb_reader *desc)
1099 {
1100 struct sock_xprt *transport =
1101 container_of(xprt, struct sock_xprt, xprt);
1102 struct rpc_rqst *req;
1103
1104 req = xprt_alloc_bc_request(xprt);
1105 if (req == NULL) {
1106 printk(KERN_WARNING "Callback slot table overflowed\n");
1107 xprt_force_disconnect(xprt);
1108 return -1;
1109 }
1110
1111 req->rq_xid = transport->tcp_xid;
1112 dprintk("RPC: read callback XID %08x\n", ntohl(req->rq_xid));
1113 xs_tcp_read_common(xprt, desc, req);
1114
1115 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) {
1116 struct svc_serv *bc_serv = xprt->bc_serv;
1117
1118 /*
1119 * Add callback request to callback list. The callback
1120 * service sleeps on the sv_cb_waitq waiting for new
1121 * requests. Wake it up after adding enqueing the
1122 * request.
1123 */
1124 dprintk("RPC: add callback request to list\n");
1125 spin_lock(&bc_serv->sv_cb_lock);
1126 list_add(&req->rq_bc_list, &bc_serv->sv_cb_list);
1127 spin_unlock(&bc_serv->sv_cb_lock);
1128 wake_up(&bc_serv->sv_cb_waitq);
1129 }
1130
1131 req->rq_private_buf.len = transport->tcp_copied;
1132
1133 return 0;
1134 }
1135
1136 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1137 struct xdr_skb_reader *desc)
1138 {
1139 struct sock_xprt *transport =
1140 container_of(xprt, struct sock_xprt, xprt);
1141
1142 return (transport->tcp_flags & TCP_RPC_REPLY) ?
1143 xs_tcp_read_reply(xprt, desc) :
1144 xs_tcp_read_callback(xprt, desc);
1145 }
1146 #else
1147 static inline int _xs_tcp_read_data(struct rpc_xprt *xprt,
1148 struct xdr_skb_reader *desc)
1149 {
1150 return xs_tcp_read_reply(xprt, desc);
1151 }
1152 #endif /* CONFIG_NFS_V4_1 */
1153
1154 /*
1155 * Read data off the transport. This can be either an RPC_CALL or an
1156 * RPC_REPLY. Relay the processing to helper functions.
1157 */
1158 static void xs_tcp_read_data(struct rpc_xprt *xprt,
1159 struct xdr_skb_reader *desc)
1160 {
1161 struct sock_xprt *transport =
1162 container_of(xprt, struct sock_xprt, xprt);
1163
1164 if (_xs_tcp_read_data(xprt, desc) == 0)
1165 xs_tcp_check_fraghdr(transport);
1166 else {
1167 /*
1168 * The transport_lock protects the request handling.
1169 * There's no need to hold it to update the tcp_flags.
1170 */
1171 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
1172 }
1173 }
1174
1175 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
1176 {
1177 size_t len;
1178
1179 len = transport->tcp_reclen - transport->tcp_offset;
1180 if (len > desc->count)
1181 len = desc->count;
1182 desc->count -= len;
1183 desc->offset += len;
1184 transport->tcp_offset += len;
1185 dprintk("RPC: discarded %Zu bytes\n", len);
1186 xs_tcp_check_fraghdr(transport);
1187 }
1188
1189 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
1190 {
1191 struct rpc_xprt *xprt = rd_desc->arg.data;
1192 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1193 struct xdr_skb_reader desc = {
1194 .skb = skb,
1195 .offset = offset,
1196 .count = len,
1197 };
1198
1199 dprintk("RPC: xs_tcp_data_recv started\n");
1200 do {
1201 /* Read in a new fragment marker if necessary */
1202 /* Can we ever really expect to get completely empty fragments? */
1203 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
1204 xs_tcp_read_fraghdr(xprt, &desc);
1205 continue;
1206 }
1207 /* Read in the xid if necessary */
1208 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
1209 xs_tcp_read_xid(transport, &desc);
1210 continue;
1211 }
1212 /* Read in the call/reply flag */
1213 if (transport->tcp_flags & TCP_RCV_READ_CALLDIR) {
1214 xs_tcp_read_calldir(transport, &desc);
1215 continue;
1216 }
1217 /* Read in the request data */
1218 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
1219 xs_tcp_read_data(xprt, &desc);
1220 continue;
1221 }
1222 /* Skip over any trailing bytes on short reads */
1223 xs_tcp_read_discard(transport, &desc);
1224 } while (desc.count);
1225 dprintk("RPC: xs_tcp_data_recv done\n");
1226 return len - desc.count;
1227 }
1228
1229 /**
1230 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1231 * @sk: socket with data to read
1232 * @bytes: how much data to read
1233 *
1234 */
1235 static void xs_tcp_data_ready(struct sock *sk, int bytes)
1236 {
1237 struct rpc_xprt *xprt;
1238 read_descriptor_t rd_desc;
1239 int read;
1240
1241 dprintk("RPC: xs_tcp_data_ready...\n");
1242
1243 read_lock(&sk->sk_callback_lock);
1244 if (!(xprt = xprt_from_sock(sk)))
1245 goto out;
1246 if (xprt->shutdown)
1247 goto out;
1248
1249 /* Any data means we had a useful conversation, so
1250 * the we don't need to delay the next reconnect
1251 */
1252 if (xprt->reestablish_timeout)
1253 xprt->reestablish_timeout = 0;
1254
1255 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1256 rd_desc.arg.data = xprt;
1257 do {
1258 rd_desc.count = 65536;
1259 read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
1260 } while (read > 0);
1261 out:
1262 read_unlock(&sk->sk_callback_lock);
1263 }
1264
1265 /*
1266 * Do the equivalent of linger/linger2 handling for dealing with
1267 * broken servers that don't close the socket in a timely
1268 * fashion
1269 */
1270 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt *xprt,
1271 unsigned long timeout)
1272 {
1273 struct sock_xprt *transport;
1274
1275 if (xprt_test_and_set_connecting(xprt))
1276 return;
1277 set_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1278 transport = container_of(xprt, struct sock_xprt, xprt);
1279 queue_delayed_work(rpciod_workqueue, &transport->connect_worker,
1280 timeout);
1281 }
1282
1283 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
1284 {
1285 struct sock_xprt *transport;
1286
1287 transport = container_of(xprt, struct sock_xprt, xprt);
1288
1289 if (!test_bit(XPRT_CONNECTION_ABORT, &xprt->state) ||
1290 !cancel_delayed_work(&transport->connect_worker))
1291 return;
1292 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1293 xprt_clear_connecting(xprt);
1294 }
1295
1296 static void xs_sock_mark_closed(struct rpc_xprt *xprt)
1297 {
1298 smp_mb__before_clear_bit();
1299 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1300 clear_bit(XPRT_CLOSING, &xprt->state);
1301 smp_mb__after_clear_bit();
1302 /* Mark transport as closed and wake up all pending tasks */
1303 xprt_disconnect_done(xprt);
1304 }
1305
1306 /**
1307 * xs_tcp_state_change - callback to handle TCP socket state changes
1308 * @sk: socket whose state has changed
1309 *
1310 */
1311 static void xs_tcp_state_change(struct sock *sk)
1312 {
1313 struct rpc_xprt *xprt;
1314
1315 read_lock(&sk->sk_callback_lock);
1316 if (!(xprt = xprt_from_sock(sk)))
1317 goto out;
1318 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
1319 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
1320 sk->sk_state, xprt_connected(xprt),
1321 sock_flag(sk, SOCK_DEAD),
1322 sock_flag(sk, SOCK_ZAPPED));
1323
1324 switch (sk->sk_state) {
1325 case TCP_ESTABLISHED:
1326 spin_lock_bh(&xprt->transport_lock);
1327 if (!xprt_test_and_set_connected(xprt)) {
1328 struct sock_xprt *transport = container_of(xprt,
1329 struct sock_xprt, xprt);
1330
1331 /* Reset TCP record info */
1332 transport->tcp_offset = 0;
1333 transport->tcp_reclen = 0;
1334 transport->tcp_copied = 0;
1335 transport->tcp_flags =
1336 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
1337
1338 xprt_wake_pending_tasks(xprt, -EAGAIN);
1339 }
1340 spin_unlock_bh(&xprt->transport_lock);
1341 break;
1342 case TCP_FIN_WAIT1:
1343 /* The client initiated a shutdown of the socket */
1344 xprt->connect_cookie++;
1345 xprt->reestablish_timeout = 0;
1346 set_bit(XPRT_CLOSING, &xprt->state);
1347 smp_mb__before_clear_bit();
1348 clear_bit(XPRT_CONNECTED, &xprt->state);
1349 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
1350 smp_mb__after_clear_bit();
1351 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1352 break;
1353 case TCP_CLOSE_WAIT:
1354 /* The server initiated a shutdown of the socket */
1355 xprt_force_disconnect(xprt);
1356 case TCP_SYN_SENT:
1357 xprt->connect_cookie++;
1358 case TCP_CLOSING:
1359 /*
1360 * If the server closed down the connection, make sure that
1361 * we back off before reconnecting
1362 */
1363 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
1364 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1365 break;
1366 case TCP_LAST_ACK:
1367 set_bit(XPRT_CLOSING, &xprt->state);
1368 xs_tcp_schedule_linger_timeout(xprt, xs_tcp_fin_timeout);
1369 smp_mb__before_clear_bit();
1370 clear_bit(XPRT_CONNECTED, &xprt->state);
1371 smp_mb__after_clear_bit();
1372 break;
1373 case TCP_CLOSE:
1374 xs_tcp_cancel_linger_timeout(xprt);
1375 xs_sock_mark_closed(xprt);
1376 }
1377 out:
1378 read_unlock(&sk->sk_callback_lock);
1379 }
1380
1381 /**
1382 * xs_error_report - callback mainly for catching socket errors
1383 * @sk: socket
1384 */
1385 static void xs_error_report(struct sock *sk)
1386 {
1387 struct rpc_xprt *xprt;
1388
1389 read_lock(&sk->sk_callback_lock);
1390 if (!(xprt = xprt_from_sock(sk)))
1391 goto out;
1392 dprintk("RPC: %s client %p...\n"
1393 "RPC: error %d\n",
1394 __func__, xprt, sk->sk_err);
1395 xprt_wake_pending_tasks(xprt, -EAGAIN);
1396 out:
1397 read_unlock(&sk->sk_callback_lock);
1398 }
1399
1400 static void xs_write_space(struct sock *sk)
1401 {
1402 struct socket *sock;
1403 struct rpc_xprt *xprt;
1404
1405 if (unlikely(!(sock = sk->sk_socket)))
1406 return;
1407 clear_bit(SOCK_NOSPACE, &sock->flags);
1408
1409 if (unlikely(!(xprt = xprt_from_sock(sk))))
1410 return;
1411 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0)
1412 return;
1413
1414 xprt_write_space(xprt);
1415 }
1416
1417 /**
1418 * xs_udp_write_space - callback invoked when socket buffer space
1419 * becomes available
1420 * @sk: socket whose state has changed
1421 *
1422 * Called when more output buffer space is available for this socket.
1423 * We try not to wake our writers until they can make "significant"
1424 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1425 * with a bunch of small requests.
1426 */
1427 static void xs_udp_write_space(struct sock *sk)
1428 {
1429 read_lock(&sk->sk_callback_lock);
1430
1431 /* from net/core/sock.c:sock_def_write_space */
1432 if (sock_writeable(sk))
1433 xs_write_space(sk);
1434
1435 read_unlock(&sk->sk_callback_lock);
1436 }
1437
1438 /**
1439 * xs_tcp_write_space - callback invoked when socket buffer space
1440 * becomes available
1441 * @sk: socket whose state has changed
1442 *
1443 * Called when more output buffer space is available for this socket.
1444 * We try not to wake our writers until they can make "significant"
1445 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1446 * with a bunch of small requests.
1447 */
1448 static void xs_tcp_write_space(struct sock *sk)
1449 {
1450 read_lock(&sk->sk_callback_lock);
1451
1452 /* from net/core/stream.c:sk_stream_write_space */
1453 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
1454 xs_write_space(sk);
1455
1456 read_unlock(&sk->sk_callback_lock);
1457 }
1458
1459 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1460 {
1461 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1462 struct sock *sk = transport->inet;
1463
1464 if (transport->rcvsize) {
1465 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1466 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1467 }
1468 if (transport->sndsize) {
1469 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1470 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1471 sk->sk_write_space(sk);
1472 }
1473 }
1474
1475 /**
1476 * xs_udp_set_buffer_size - set send and receive limits
1477 * @xprt: generic transport
1478 * @sndsize: requested size of send buffer, in bytes
1479 * @rcvsize: requested size of receive buffer, in bytes
1480 *
1481 * Set socket send and receive buffer size limits.
1482 */
1483 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1484 {
1485 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1486
1487 transport->sndsize = 0;
1488 if (sndsize)
1489 transport->sndsize = sndsize + 1024;
1490 transport->rcvsize = 0;
1491 if (rcvsize)
1492 transport->rcvsize = rcvsize + 1024;
1493
1494 xs_udp_do_set_buffer_size(xprt);
1495 }
1496
1497 /**
1498 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1499 * @task: task that timed out
1500 *
1501 * Adjust the congestion window after a retransmit timeout has occurred.
1502 */
1503 static void xs_udp_timer(struct rpc_task *task)
1504 {
1505 xprt_adjust_cwnd(task, -ETIMEDOUT);
1506 }
1507
1508 static unsigned short xs_get_random_port(void)
1509 {
1510 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1511 unsigned short rand = (unsigned short) net_random() % range;
1512 return rand + xprt_min_resvport;
1513 }
1514
1515 /**
1516 * xs_set_port - reset the port number in the remote endpoint address
1517 * @xprt: generic transport
1518 * @port: new port number
1519 *
1520 */
1521 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1522 {
1523 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1524
1525 rpc_set_port(xs_addr(xprt), port);
1526 xs_update_peer_port(xprt);
1527 }
1528
1529 static unsigned short xs_get_srcport(struct sock_xprt *transport, struct socket *sock)
1530 {
1531 unsigned short port = transport->srcport;
1532
1533 if (port == 0 && transport->xprt.resvport)
1534 port = xs_get_random_port();
1535 return port;
1536 }
1537
1538 static unsigned short xs_next_srcport(struct sock_xprt *transport, struct socket *sock, unsigned short port)
1539 {
1540 if (transport->srcport != 0)
1541 transport->srcport = 0;
1542 if (!transport->xprt.resvport)
1543 return 0;
1544 if (port <= xprt_min_resvport || port > xprt_max_resvport)
1545 return xprt_max_resvport;
1546 return --port;
1547 }
1548
1549 static int xs_bind4(struct sock_xprt *transport, struct socket *sock)
1550 {
1551 struct sockaddr_in myaddr = {
1552 .sin_family = AF_INET,
1553 };
1554 struct sockaddr_in *sa;
1555 int err, nloop = 0;
1556 unsigned short port = xs_get_srcport(transport, sock);
1557 unsigned short last;
1558
1559 sa = (struct sockaddr_in *)&transport->srcaddr;
1560 myaddr.sin_addr = sa->sin_addr;
1561 do {
1562 myaddr.sin_port = htons(port);
1563 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1564 sizeof(myaddr));
1565 if (port == 0)
1566 break;
1567 if (err == 0) {
1568 transport->srcport = port;
1569 break;
1570 }
1571 last = port;
1572 port = xs_next_srcport(transport, sock, port);
1573 if (port > last)
1574 nloop++;
1575 } while (err == -EADDRINUSE && nloop != 2);
1576 dprintk("RPC: %s %pI4:%u: %s (%d)\n",
1577 __func__, &myaddr.sin_addr,
1578 port, err ? "failed" : "ok", err);
1579 return err;
1580 }
1581
1582 static int xs_bind6(struct sock_xprt *transport, struct socket *sock)
1583 {
1584 struct sockaddr_in6 myaddr = {
1585 .sin6_family = AF_INET6,
1586 };
1587 struct sockaddr_in6 *sa;
1588 int err, nloop = 0;
1589 unsigned short port = xs_get_srcport(transport, sock);
1590 unsigned short last;
1591
1592 sa = (struct sockaddr_in6 *)&transport->srcaddr;
1593 myaddr.sin6_addr = sa->sin6_addr;
1594 do {
1595 myaddr.sin6_port = htons(port);
1596 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1597 sizeof(myaddr));
1598 if (port == 0)
1599 break;
1600 if (err == 0) {
1601 transport->srcport = port;
1602 break;
1603 }
1604 last = port;
1605 port = xs_next_srcport(transport, sock, port);
1606 if (port > last)
1607 nloop++;
1608 } while (err == -EADDRINUSE && nloop != 2);
1609 dprintk("RPC: xs_bind6 %pI6:%u: %s (%d)\n",
1610 &myaddr.sin6_addr, port, err ? "failed" : "ok", err);
1611 return err;
1612 }
1613
1614 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1615 static struct lock_class_key xs_key[2];
1616 static struct lock_class_key xs_slock_key[2];
1617
1618 static inline void xs_reclassify_socket4(struct socket *sock)
1619 {
1620 struct sock *sk = sock->sk;
1621
1622 BUG_ON(sock_owned_by_user(sk));
1623 sock_lock_init_class_and_name(sk, "slock-AF_INET-RPC",
1624 &xs_slock_key[0], "sk_lock-AF_INET-RPC", &xs_key[0]);
1625 }
1626
1627 static inline void xs_reclassify_socket6(struct socket *sock)
1628 {
1629 struct sock *sk = sock->sk;
1630
1631 BUG_ON(sock_owned_by_user(sk));
1632 sock_lock_init_class_and_name(sk, "slock-AF_INET6-RPC",
1633 &xs_slock_key[1], "sk_lock-AF_INET6-RPC", &xs_key[1]);
1634 }
1635 #else
1636 static inline void xs_reclassify_socket4(struct socket *sock)
1637 {
1638 }
1639
1640 static inline void xs_reclassify_socket6(struct socket *sock)
1641 {
1642 }
1643 #endif
1644
1645 static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1646 {
1647 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1648
1649 if (!transport->inet) {
1650 struct sock *sk = sock->sk;
1651
1652 write_lock_bh(&sk->sk_callback_lock);
1653
1654 xs_save_old_callbacks(transport, sk);
1655
1656 sk->sk_user_data = xprt;
1657 sk->sk_data_ready = xs_udp_data_ready;
1658 sk->sk_write_space = xs_udp_write_space;
1659 sk->sk_error_report = xs_error_report;
1660 sk->sk_no_check = UDP_CSUM_NORCV;
1661 sk->sk_allocation = GFP_ATOMIC;
1662
1663 xprt_set_connected(xprt);
1664
1665 /* Reset to new socket */
1666 transport->sock = sock;
1667 transport->inet = sk;
1668
1669 write_unlock_bh(&sk->sk_callback_lock);
1670 }
1671 xs_udp_do_set_buffer_size(xprt);
1672 }
1673
1674 /**
1675 * xs_udp_connect_worker4 - set up a UDP socket
1676 * @work: RPC transport to connect
1677 *
1678 * Invoked by a work queue tasklet.
1679 */
1680 static void xs_udp_connect_worker4(struct work_struct *work)
1681 {
1682 struct sock_xprt *transport =
1683 container_of(work, struct sock_xprt, connect_worker.work);
1684 struct rpc_xprt *xprt = &transport->xprt;
1685 struct socket *sock = transport->sock;
1686 int err, status = -EIO;
1687
1688 if (xprt->shutdown)
1689 goto out;
1690
1691 /* Start by resetting any existing state */
1692 xs_reset_transport(transport);
1693
1694 err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
1695 if (err < 0) {
1696 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1697 goto out;
1698 }
1699 xs_reclassify_socket4(sock);
1700
1701 if (xs_bind4(transport, sock)) {
1702 sock_release(sock);
1703 goto out;
1704 }
1705
1706 dprintk("RPC: worker connecting xprt %p via %s to "
1707 "%s (port %s)\n", xprt,
1708 xprt->address_strings[RPC_DISPLAY_PROTO],
1709 xprt->address_strings[RPC_DISPLAY_ADDR],
1710 xprt->address_strings[RPC_DISPLAY_PORT]);
1711
1712 xs_udp_finish_connecting(xprt, sock);
1713 status = 0;
1714 out:
1715 xprt_clear_connecting(xprt);
1716 xprt_wake_pending_tasks(xprt, status);
1717 }
1718
1719 /**
1720 * xs_udp_connect_worker6 - set up a UDP socket
1721 * @work: RPC transport to connect
1722 *
1723 * Invoked by a work queue tasklet.
1724 */
1725 static void xs_udp_connect_worker6(struct work_struct *work)
1726 {
1727 struct sock_xprt *transport =
1728 container_of(work, struct sock_xprt, connect_worker.work);
1729 struct rpc_xprt *xprt = &transport->xprt;
1730 struct socket *sock = transport->sock;
1731 int err, status = -EIO;
1732
1733 if (xprt->shutdown)
1734 goto out;
1735
1736 /* Start by resetting any existing state */
1737 xs_reset_transport(transport);
1738
1739 err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock);
1740 if (err < 0) {
1741 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1742 goto out;
1743 }
1744 xs_reclassify_socket6(sock);
1745
1746 if (xs_bind6(transport, sock) < 0) {
1747 sock_release(sock);
1748 goto out;
1749 }
1750
1751 dprintk("RPC: worker connecting xprt %p via %s to "
1752 "%s (port %s)\n", xprt,
1753 xprt->address_strings[RPC_DISPLAY_PROTO],
1754 xprt->address_strings[RPC_DISPLAY_ADDR],
1755 xprt->address_strings[RPC_DISPLAY_PORT]);
1756
1757 xs_udp_finish_connecting(xprt, sock);
1758 status = 0;
1759 out:
1760 xprt_clear_connecting(xprt);
1761 xprt_wake_pending_tasks(xprt, status);
1762 }
1763
1764 /*
1765 * We need to preserve the port number so the reply cache on the server can
1766 * find our cached RPC replies when we get around to reconnecting.
1767 */
1768 static void xs_abort_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1769 {
1770 int result;
1771 struct sockaddr any;
1772
1773 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1774
1775 /*
1776 * Disconnect the transport socket by doing a connect operation
1777 * with AF_UNSPEC. This should return immediately...
1778 */
1779 memset(&any, 0, sizeof(any));
1780 any.sa_family = AF_UNSPEC;
1781 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1782 if (!result)
1783 xs_sock_mark_closed(xprt);
1784 else
1785 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1786 result);
1787 }
1788
1789 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt, struct sock_xprt *transport)
1790 {
1791 unsigned int state = transport->inet->sk_state;
1792
1793 if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED)
1794 return;
1795 if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT))
1796 return;
1797 xs_abort_connection(xprt, transport);
1798 }
1799
1800 static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
1801 {
1802 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1803
1804 if (!transport->inet) {
1805 struct sock *sk = sock->sk;
1806
1807 write_lock_bh(&sk->sk_callback_lock);
1808
1809 xs_save_old_callbacks(transport, sk);
1810
1811 sk->sk_user_data = xprt;
1812 sk->sk_data_ready = xs_tcp_data_ready;
1813 sk->sk_state_change = xs_tcp_state_change;
1814 sk->sk_write_space = xs_tcp_write_space;
1815 sk->sk_error_report = xs_error_report;
1816 sk->sk_allocation = GFP_ATOMIC;
1817
1818 /* socket options */
1819 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1820 sock_reset_flag(sk, SOCK_LINGER);
1821 tcp_sk(sk)->linger2 = 0;
1822 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1823
1824 xprt_clear_connected(xprt);
1825
1826 /* Reset to new socket */
1827 transport->sock = sock;
1828 transport->inet = sk;
1829
1830 write_unlock_bh(&sk->sk_callback_lock);
1831 }
1832
1833 if (!xprt_bound(xprt))
1834 return -ENOTCONN;
1835
1836 /* Tell the socket layer to start connecting... */
1837 xprt->stat.connect_count++;
1838 xprt->stat.connect_start = jiffies;
1839 return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK);
1840 }
1841
1842 /**
1843 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
1844 * @xprt: RPC transport to connect
1845 * @transport: socket transport to connect
1846 * @create_sock: function to create a socket of the correct type
1847 *
1848 * Invoked by a work queue tasklet.
1849 */
1850 static void xs_tcp_setup_socket(struct rpc_xprt *xprt,
1851 struct sock_xprt *transport,
1852 struct socket *(*create_sock)(struct rpc_xprt *,
1853 struct sock_xprt *))
1854 {
1855 struct socket *sock = transport->sock;
1856 int status = -EIO;
1857
1858 if (xprt->shutdown)
1859 goto out;
1860
1861 if (!sock) {
1862 clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
1863 sock = create_sock(xprt, transport);
1864 if (IS_ERR(sock)) {
1865 status = PTR_ERR(sock);
1866 goto out;
1867 }
1868 } else {
1869 int abort_and_exit;
1870
1871 abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
1872 &xprt->state);
1873 /* "close" the socket, preserving the local port */
1874 xs_tcp_reuse_connection(xprt, transport);
1875
1876 if (abort_and_exit)
1877 goto out_eagain;
1878 }
1879
1880 dprintk("RPC: worker connecting xprt %p via %s to "
1881 "%s (port %s)\n", xprt,
1882 xprt->address_strings[RPC_DISPLAY_PROTO],
1883 xprt->address_strings[RPC_DISPLAY_ADDR],
1884 xprt->address_strings[RPC_DISPLAY_PORT]);
1885
1886 status = xs_tcp_finish_connecting(xprt, sock);
1887 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1888 xprt, -status, xprt_connected(xprt),
1889 sock->sk->sk_state);
1890 switch (status) {
1891 default:
1892 printk("%s: connect returned unhandled error %d\n",
1893 __func__, status);
1894 case -EADDRNOTAVAIL:
1895 /* We're probably in TIME_WAIT. Get rid of existing socket,
1896 * and retry
1897 */
1898 set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
1899 xprt_force_disconnect(xprt);
1900 break;
1901 case -ECONNREFUSED:
1902 case -ECONNRESET:
1903 case -ENETUNREACH:
1904 /* retry with existing socket, after a delay */
1905 case 0:
1906 case -EINPROGRESS:
1907 case -EALREADY:
1908 xprt_clear_connecting(xprt);
1909 return;
1910 case -EINVAL:
1911 /* Happens, for instance, if the user specified a link
1912 * local IPv6 address without a scope-id.
1913 */
1914 goto out;
1915 }
1916 out_eagain:
1917 status = -EAGAIN;
1918 out:
1919 xprt_clear_connecting(xprt);
1920 xprt_wake_pending_tasks(xprt, status);
1921 }
1922
1923 static struct socket *xs_create_tcp_sock4(struct rpc_xprt *xprt,
1924 struct sock_xprt *transport)
1925 {
1926 struct socket *sock;
1927 int err;
1928
1929 /* start from scratch */
1930 err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1931 if (err < 0) {
1932 dprintk("RPC: can't create TCP transport socket (%d).\n",
1933 -err);
1934 goto out_err;
1935 }
1936 xs_reclassify_socket4(sock);
1937
1938 if (xs_bind4(transport, sock) < 0) {
1939 sock_release(sock);
1940 goto out_err;
1941 }
1942 return sock;
1943 out_err:
1944 return ERR_PTR(-EIO);
1945 }
1946
1947 /**
1948 * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint
1949 * @work: RPC transport to connect
1950 *
1951 * Invoked by a work queue tasklet.
1952 */
1953 static void xs_tcp_connect_worker4(struct work_struct *work)
1954 {
1955 struct sock_xprt *transport =
1956 container_of(work, struct sock_xprt, connect_worker.work);
1957 struct rpc_xprt *xprt = &transport->xprt;
1958
1959 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock4);
1960 }
1961
1962 static struct socket *xs_create_tcp_sock6(struct rpc_xprt *xprt,
1963 struct sock_xprt *transport)
1964 {
1965 struct socket *sock;
1966 int err;
1967
1968 /* start from scratch */
1969 err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock);
1970 if (err < 0) {
1971 dprintk("RPC: can't create TCP transport socket (%d).\n",
1972 -err);
1973 goto out_err;
1974 }
1975 xs_reclassify_socket6(sock);
1976
1977 if (xs_bind6(transport, sock) < 0) {
1978 sock_release(sock);
1979 goto out_err;
1980 }
1981 return sock;
1982 out_err:
1983 return ERR_PTR(-EIO);
1984 }
1985
1986 /**
1987 * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint
1988 * @work: RPC transport to connect
1989 *
1990 * Invoked by a work queue tasklet.
1991 */
1992 static void xs_tcp_connect_worker6(struct work_struct *work)
1993 {
1994 struct sock_xprt *transport =
1995 container_of(work, struct sock_xprt, connect_worker.work);
1996 struct rpc_xprt *xprt = &transport->xprt;
1997
1998 xs_tcp_setup_socket(xprt, transport, xs_create_tcp_sock6);
1999 }
2000
2001 /**
2002 * xs_connect - connect a socket to a remote endpoint
2003 * @task: address of RPC task that manages state of connect request
2004 *
2005 * TCP: If the remote end dropped the connection, delay reconnecting.
2006 *
2007 * UDP socket connects are synchronous, but we use a work queue anyway
2008 * to guarantee that even unprivileged user processes can set up a
2009 * socket on a privileged port.
2010 *
2011 * If a UDP socket connect fails, the delay behavior here prevents
2012 * retry floods (hard mounts).
2013 */
2014 static void xs_connect(struct rpc_task *task)
2015 {
2016 struct rpc_xprt *xprt = task->tk_xprt;
2017 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2018
2019 if (xprt_test_and_set_connecting(xprt))
2020 return;
2021
2022 if (transport->sock != NULL && !RPC_IS_SOFTCONN(task)) {
2023 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2024 "seconds\n",
2025 xprt, xprt->reestablish_timeout / HZ);
2026 queue_delayed_work(rpciod_workqueue,
2027 &transport->connect_worker,
2028 xprt->reestablish_timeout);
2029 xprt->reestablish_timeout <<= 1;
2030 if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
2031 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2032 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
2033 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
2034 } else {
2035 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
2036 queue_delayed_work(rpciod_workqueue,
2037 &transport->connect_worker, 0);
2038 }
2039 }
2040
2041 static void xs_tcp_connect(struct rpc_task *task)
2042 {
2043 struct rpc_xprt *xprt = task->tk_xprt;
2044
2045 /* Exit if we need to wait for socket shutdown to complete */
2046 if (test_bit(XPRT_CLOSING, &xprt->state))
2047 return;
2048 xs_connect(task);
2049 }
2050
2051 /**
2052 * xs_udp_print_stats - display UDP socket-specifc stats
2053 * @xprt: rpc_xprt struct containing statistics
2054 * @seq: output file
2055 *
2056 */
2057 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2058 {
2059 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2060
2061 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
2062 transport->srcport,
2063 xprt->stat.bind_count,
2064 xprt->stat.sends,
2065 xprt->stat.recvs,
2066 xprt->stat.bad_xids,
2067 xprt->stat.req_u,
2068 xprt->stat.bklog_u);
2069 }
2070
2071 /**
2072 * xs_tcp_print_stats - display TCP socket-specifc stats
2073 * @xprt: rpc_xprt struct containing statistics
2074 * @seq: output file
2075 *
2076 */
2077 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
2078 {
2079 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
2080 long idle_time = 0;
2081
2082 if (xprt_connected(xprt))
2083 idle_time = (long)(jiffies - xprt->last_used) / HZ;
2084
2085 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
2086 transport->srcport,
2087 xprt->stat.bind_count,
2088 xprt->stat.connect_count,
2089 xprt->stat.connect_time,
2090 idle_time,
2091 xprt->stat.sends,
2092 xprt->stat.recvs,
2093 xprt->stat.bad_xids,
2094 xprt->stat.req_u,
2095 xprt->stat.bklog_u);
2096 }
2097
2098 /*
2099 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2100 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2101 * to use the server side send routines.
2102 */
2103 static void *bc_malloc(struct rpc_task *task, size_t size)
2104 {
2105 struct page *page;
2106 struct rpc_buffer *buf;
2107
2108 BUG_ON(size > PAGE_SIZE - sizeof(struct rpc_buffer));
2109 page = alloc_page(GFP_KERNEL);
2110
2111 if (!page)
2112 return NULL;
2113
2114 buf = page_address(page);
2115 buf->len = PAGE_SIZE;
2116
2117 return buf->data;
2118 }
2119
2120 /*
2121 * Free the space allocated in the bc_alloc routine
2122 */
2123 static void bc_free(void *buffer)
2124 {
2125 struct rpc_buffer *buf;
2126
2127 if (!buffer)
2128 return;
2129
2130 buf = container_of(buffer, struct rpc_buffer, data);
2131 free_page((unsigned long)buf);
2132 }
2133
2134 /*
2135 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2136 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2137 */
2138 static int bc_sendto(struct rpc_rqst *req)
2139 {
2140 int len;
2141 struct xdr_buf *xbufp = &req->rq_snd_buf;
2142 struct rpc_xprt *xprt = req->rq_xprt;
2143 struct sock_xprt *transport =
2144 container_of(xprt, struct sock_xprt, xprt);
2145 struct socket *sock = transport->sock;
2146 unsigned long headoff;
2147 unsigned long tailoff;
2148
2149 /*
2150 * Set up the rpc header and record marker stuff
2151 */
2152 xs_encode_tcp_record_marker(xbufp);
2153
2154 tailoff = (unsigned long)xbufp->tail[0].iov_base & ~PAGE_MASK;
2155 headoff = (unsigned long)xbufp->head[0].iov_base & ~PAGE_MASK;
2156 len = svc_send_common(sock, xbufp,
2157 virt_to_page(xbufp->head[0].iov_base), headoff,
2158 xbufp->tail[0].iov_base, tailoff);
2159
2160 if (len != xbufp->len) {
2161 printk(KERN_NOTICE "Error sending entire callback!\n");
2162 len = -EAGAIN;
2163 }
2164
2165 return len;
2166 }
2167
2168 /*
2169 * The send routine. Borrows from svc_send
2170 */
2171 static int bc_send_request(struct rpc_task *task)
2172 {
2173 struct rpc_rqst *req = task->tk_rqstp;
2174 struct svc_xprt *xprt;
2175 struct svc_sock *svsk;
2176 u32 len;
2177
2178 dprintk("sending request with xid: %08x\n", ntohl(req->rq_xid));
2179 /*
2180 * Get the server socket associated with this callback xprt
2181 */
2182 xprt = req->rq_xprt->bc_xprt;
2183 svsk = container_of(xprt, struct svc_sock, sk_xprt);
2184
2185 /*
2186 * Grab the mutex to serialize data as the connection is shared
2187 * with the fore channel
2188 */
2189 if (!mutex_trylock(&xprt->xpt_mutex)) {
2190 rpc_sleep_on(&xprt->xpt_bc_pending, task, NULL);
2191 if (!mutex_trylock(&xprt->xpt_mutex))
2192 return -EAGAIN;
2193 rpc_wake_up_queued_task(&xprt->xpt_bc_pending, task);
2194 }
2195 if (test_bit(XPT_DEAD, &xprt->xpt_flags))
2196 len = -ENOTCONN;
2197 else
2198 len = bc_sendto(req);
2199 mutex_unlock(&xprt->xpt_mutex);
2200
2201 if (len > 0)
2202 len = 0;
2203
2204 return len;
2205 }
2206
2207 /*
2208 * The close routine. Since this is client initiated, we do nothing
2209 */
2210
2211 static void bc_close(struct rpc_xprt *xprt)
2212 {
2213 return;
2214 }
2215
2216 /*
2217 * The xprt destroy routine. Again, because this connection is client
2218 * initiated, we do nothing
2219 */
2220
2221 static void bc_destroy(struct rpc_xprt *xprt)
2222 {
2223 return;
2224 }
2225
2226 static struct rpc_xprt_ops xs_udp_ops = {
2227 .set_buffer_size = xs_udp_set_buffer_size,
2228 .reserve_xprt = xprt_reserve_xprt_cong,
2229 .release_xprt = xprt_release_xprt_cong,
2230 .rpcbind = rpcb_getport_async,
2231 .set_port = xs_set_port,
2232 .connect = xs_connect,
2233 .buf_alloc = rpc_malloc,
2234 .buf_free = rpc_free,
2235 .send_request = xs_udp_send_request,
2236 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
2237 .timer = xs_udp_timer,
2238 .release_request = xprt_release_rqst_cong,
2239 .close = xs_close,
2240 .destroy = xs_destroy,
2241 .print_stats = xs_udp_print_stats,
2242 };
2243
2244 static struct rpc_xprt_ops xs_tcp_ops = {
2245 .reserve_xprt = xprt_reserve_xprt,
2246 .release_xprt = xs_tcp_release_xprt,
2247 .rpcbind = rpcb_getport_async,
2248 .set_port = xs_set_port,
2249 .connect = xs_tcp_connect,
2250 .buf_alloc = rpc_malloc,
2251 .buf_free = rpc_free,
2252 .send_request = xs_tcp_send_request,
2253 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2254 .close = xs_tcp_close,
2255 .destroy = xs_destroy,
2256 .print_stats = xs_tcp_print_stats,
2257 };
2258
2259 /*
2260 * The rpc_xprt_ops for the server backchannel
2261 */
2262
2263 static struct rpc_xprt_ops bc_tcp_ops = {
2264 .reserve_xprt = xprt_reserve_xprt,
2265 .release_xprt = xprt_release_xprt,
2266 .buf_alloc = bc_malloc,
2267 .buf_free = bc_free,
2268 .send_request = bc_send_request,
2269 .set_retrans_timeout = xprt_set_retrans_timeout_def,
2270 .close = bc_close,
2271 .destroy = bc_destroy,
2272 .print_stats = xs_tcp_print_stats,
2273 };
2274
2275 static struct rpc_xprt *xs_setup_xprt(struct xprt_create *args,
2276 unsigned int slot_table_size)
2277 {
2278 struct rpc_xprt *xprt;
2279 struct sock_xprt *new;
2280
2281 if (args->addrlen > sizeof(xprt->addr)) {
2282 dprintk("RPC: xs_setup_xprt: address too large\n");
2283 return ERR_PTR(-EBADF);
2284 }
2285
2286 new = kzalloc(sizeof(*new), GFP_KERNEL);
2287 if (new == NULL) {
2288 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2289 "rpc_xprt\n");
2290 return ERR_PTR(-ENOMEM);
2291 }
2292 xprt = &new->xprt;
2293
2294 xprt->max_reqs = slot_table_size;
2295 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
2296 if (xprt->slot == NULL) {
2297 kfree(xprt);
2298 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
2299 "table\n");
2300 return ERR_PTR(-ENOMEM);
2301 }
2302
2303 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
2304 xprt->addrlen = args->addrlen;
2305 if (args->srcaddr)
2306 memcpy(&new->srcaddr, args->srcaddr, args->addrlen);
2307
2308 return xprt;
2309 }
2310
2311 static const struct rpc_timeout xs_udp_default_timeout = {
2312 .to_initval = 5 * HZ,
2313 .to_maxval = 30 * HZ,
2314 .to_increment = 5 * HZ,
2315 .to_retries = 5,
2316 };
2317
2318 /**
2319 * xs_setup_udp - Set up transport to use a UDP socket
2320 * @args: rpc transport creation arguments
2321 *
2322 */
2323 static struct rpc_xprt *xs_setup_udp(struct xprt_create *args)
2324 {
2325 struct sockaddr *addr = args->dstaddr;
2326 struct rpc_xprt *xprt;
2327 struct sock_xprt *transport;
2328
2329 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
2330 if (IS_ERR(xprt))
2331 return xprt;
2332 transport = container_of(xprt, struct sock_xprt, xprt);
2333
2334 xprt->prot = IPPROTO_UDP;
2335 xprt->tsh_size = 0;
2336 /* XXX: header size can vary due to auth type, IPv6, etc. */
2337 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
2338
2339 xprt->bind_timeout = XS_BIND_TO;
2340 xprt->connect_timeout = XS_UDP_CONN_TO;
2341 xprt->reestablish_timeout = XS_UDP_REEST_TO;
2342 xprt->idle_timeout = XS_IDLE_DISC_TO;
2343
2344 xprt->ops = &xs_udp_ops;
2345
2346 xprt->timeout = &xs_udp_default_timeout;
2347
2348 switch (addr->sa_family) {
2349 case AF_INET:
2350 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2351 xprt_set_bound(xprt);
2352
2353 INIT_DELAYED_WORK(&transport->connect_worker,
2354 xs_udp_connect_worker4);
2355 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP);
2356 break;
2357 case AF_INET6:
2358 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2359 xprt_set_bound(xprt);
2360
2361 INIT_DELAYED_WORK(&transport->connect_worker,
2362 xs_udp_connect_worker6);
2363 xs_format_peer_addresses(xprt, "udp", RPCBIND_NETID_UDP6);
2364 break;
2365 default:
2366 kfree(xprt);
2367 return ERR_PTR(-EAFNOSUPPORT);
2368 }
2369
2370 if (xprt_bound(xprt))
2371 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2372 xprt->address_strings[RPC_DISPLAY_ADDR],
2373 xprt->address_strings[RPC_DISPLAY_PORT],
2374 xprt->address_strings[RPC_DISPLAY_PROTO]);
2375 else
2376 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2377 xprt->address_strings[RPC_DISPLAY_ADDR],
2378 xprt->address_strings[RPC_DISPLAY_PROTO]);
2379
2380 if (try_module_get(THIS_MODULE))
2381 return xprt;
2382
2383 kfree(xprt->slot);
2384 kfree(xprt);
2385 return ERR_PTR(-EINVAL);
2386 }
2387
2388 static const struct rpc_timeout xs_tcp_default_timeout = {
2389 .to_initval = 60 * HZ,
2390 .to_maxval = 60 * HZ,
2391 .to_retries = 2,
2392 };
2393
2394 /**
2395 * xs_setup_tcp - Set up transport to use a TCP socket
2396 * @args: rpc transport creation arguments
2397 *
2398 */
2399 static struct rpc_xprt *xs_setup_tcp(struct xprt_create *args)
2400 {
2401 struct sockaddr *addr = args->dstaddr;
2402 struct rpc_xprt *xprt;
2403 struct sock_xprt *transport;
2404
2405 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2406 if (IS_ERR(xprt))
2407 return xprt;
2408 transport = container_of(xprt, struct sock_xprt, xprt);
2409
2410 xprt->prot = IPPROTO_TCP;
2411 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2412 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2413
2414 xprt->bind_timeout = XS_BIND_TO;
2415 xprt->connect_timeout = XS_TCP_CONN_TO;
2416 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
2417 xprt->idle_timeout = XS_IDLE_DISC_TO;
2418
2419 xprt->ops = &xs_tcp_ops;
2420 xprt->timeout = &xs_tcp_default_timeout;
2421
2422 switch (addr->sa_family) {
2423 case AF_INET:
2424 if (((struct sockaddr_in *)addr)->sin_port != htons(0))
2425 xprt_set_bound(xprt);
2426
2427 INIT_DELAYED_WORK(&transport->connect_worker,
2428 xs_tcp_connect_worker4);
2429 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP);
2430 break;
2431 case AF_INET6:
2432 if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0))
2433 xprt_set_bound(xprt);
2434
2435 INIT_DELAYED_WORK(&transport->connect_worker,
2436 xs_tcp_connect_worker6);
2437 xs_format_peer_addresses(xprt, "tcp", RPCBIND_NETID_TCP6);
2438 break;
2439 default:
2440 kfree(xprt);
2441 return ERR_PTR(-EAFNOSUPPORT);
2442 }
2443
2444 if (xprt_bound(xprt))
2445 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2446 xprt->address_strings[RPC_DISPLAY_ADDR],
2447 xprt->address_strings[RPC_DISPLAY_PORT],
2448 xprt->address_strings[RPC_DISPLAY_PROTO]);
2449 else
2450 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2451 xprt->address_strings[RPC_DISPLAY_ADDR],
2452 xprt->address_strings[RPC_DISPLAY_PROTO]);
2453
2454
2455 if (try_module_get(THIS_MODULE))
2456 return xprt;
2457
2458 kfree(xprt->slot);
2459 kfree(xprt);
2460 return ERR_PTR(-EINVAL);
2461 }
2462
2463 /**
2464 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2465 * @args: rpc transport creation arguments
2466 *
2467 */
2468 static struct rpc_xprt *xs_setup_bc_tcp(struct xprt_create *args)
2469 {
2470 struct sockaddr *addr = args->dstaddr;
2471 struct rpc_xprt *xprt;
2472 struct sock_xprt *transport;
2473 struct svc_sock *bc_sock;
2474
2475 if (!args->bc_xprt)
2476 ERR_PTR(-EINVAL);
2477
2478 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
2479 if (IS_ERR(xprt))
2480 return xprt;
2481 transport = container_of(xprt, struct sock_xprt, xprt);
2482
2483 xprt->prot = IPPROTO_TCP;
2484 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
2485 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
2486 xprt->timeout = &xs_tcp_default_timeout;
2487
2488 /* backchannel */
2489 xprt_set_bound(xprt);
2490 xprt->bind_timeout = 0;
2491 xprt->connect_timeout = 0;
2492 xprt->reestablish_timeout = 0;
2493 xprt->idle_timeout = 0;
2494
2495 /*
2496 * The backchannel uses the same socket connection as the
2497 * forechannel
2498 */
2499 xprt->bc_xprt = args->bc_xprt;
2500 bc_sock = container_of(args->bc_xprt, struct svc_sock, sk_xprt);
2501 bc_sock->sk_bc_xprt = xprt;
2502 transport->sock = bc_sock->sk_sock;
2503 transport->inet = bc_sock->sk_sk;
2504
2505 xprt->ops = &bc_tcp_ops;
2506
2507 switch (addr->sa_family) {
2508 case AF_INET:
2509 xs_format_peer_addresses(xprt, "tcp",
2510 RPCBIND_NETID_TCP);
2511 break;
2512 case AF_INET6:
2513 xs_format_peer_addresses(xprt, "tcp",
2514 RPCBIND_NETID_TCP6);
2515 break;
2516 default:
2517 kfree(xprt);
2518 return ERR_PTR(-EAFNOSUPPORT);
2519 }
2520
2521 if (xprt_bound(xprt))
2522 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2523 xprt->address_strings[RPC_DISPLAY_ADDR],
2524 xprt->address_strings[RPC_DISPLAY_PORT],
2525 xprt->address_strings[RPC_DISPLAY_PROTO]);
2526 else
2527 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2528 xprt->address_strings[RPC_DISPLAY_ADDR],
2529 xprt->address_strings[RPC_DISPLAY_PROTO]);
2530
2531 /*
2532 * Since we don't want connections for the backchannel, we set
2533 * the xprt status to connected
2534 */
2535 xprt_set_connected(xprt);
2536
2537
2538 if (try_module_get(THIS_MODULE))
2539 return xprt;
2540 kfree(xprt->slot);
2541 kfree(xprt);
2542 return ERR_PTR(-EINVAL);
2543 }
2544
2545 static struct xprt_class xs_udp_transport = {
2546 .list = LIST_HEAD_INIT(xs_udp_transport.list),
2547 .name = "udp",
2548 .owner = THIS_MODULE,
2549 .ident = XPRT_TRANSPORT_UDP,
2550 .setup = xs_setup_udp,
2551 };
2552
2553 static struct xprt_class xs_tcp_transport = {
2554 .list = LIST_HEAD_INIT(xs_tcp_transport.list),
2555 .name = "tcp",
2556 .owner = THIS_MODULE,
2557 .ident = XPRT_TRANSPORT_TCP,
2558 .setup = xs_setup_tcp,
2559 };
2560
2561 static struct xprt_class xs_bc_tcp_transport = {
2562 .list = LIST_HEAD_INIT(xs_bc_tcp_transport.list),
2563 .name = "tcp NFSv4.1 backchannel",
2564 .owner = THIS_MODULE,
2565 .ident = XPRT_TRANSPORT_BC_TCP,
2566 .setup = xs_setup_bc_tcp,
2567 };
2568
2569 /**
2570 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
2571 *
2572 */
2573 int init_socket_xprt(void)
2574 {
2575 #ifdef RPC_DEBUG
2576 if (!sunrpc_table_header)
2577 sunrpc_table_header = register_sysctl_table(sunrpc_table);
2578 #endif
2579
2580 xprt_register_transport(&xs_udp_transport);
2581 xprt_register_transport(&xs_tcp_transport);
2582 xprt_register_transport(&xs_bc_tcp_transport);
2583
2584 return 0;
2585 }
2586
2587 /**
2588 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
2589 *
2590 */
2591 void cleanup_socket_xprt(void)
2592 {
2593 #ifdef RPC_DEBUG
2594 if (sunrpc_table_header) {
2595 unregister_sysctl_table(sunrpc_table_header);
2596 sunrpc_table_header = NULL;
2597 }
2598 #endif
2599
2600 xprt_unregister_transport(&xs_udp_transport);
2601 xprt_unregister_transport(&xs_tcp_transport);
2602 xprt_unregister_transport(&xs_bc_tcp_transport);
2603 }
2604
2605 static int param_set_uint_minmax(const char *val, struct kernel_param *kp,
2606 unsigned int min, unsigned int max)
2607 {
2608 unsigned long num;
2609 int ret;
2610
2611 if (!val)
2612 return -EINVAL;
2613 ret = strict_strtoul(val, 0, &num);
2614 if (ret == -EINVAL || num < min || num > max)
2615 return -EINVAL;
2616 *((unsigned int *)kp->arg) = num;
2617 return 0;
2618 }
2619
2620 static int param_set_portnr(const char *val, struct kernel_param *kp)
2621 {
2622 return param_set_uint_minmax(val, kp,
2623 RPC_MIN_RESVPORT,
2624 RPC_MAX_RESVPORT);
2625 }
2626
2627 static int param_get_portnr(char *buffer, struct kernel_param *kp)
2628 {
2629 return param_get_uint(buffer, kp);
2630 }
2631 #define param_check_portnr(name, p) \
2632 __param_check(name, p, unsigned int);
2633
2634 module_param_named(min_resvport, xprt_min_resvport, portnr, 0644);
2635 module_param_named(max_resvport, xprt_max_resvport, portnr, 0644);
2636
2637 static int param_set_slot_table_size(const char *val, struct kernel_param *kp)
2638 {
2639 return param_set_uint_minmax(val, kp,
2640 RPC_MIN_SLOT_TABLE,
2641 RPC_MAX_SLOT_TABLE);
2642 }
2643
2644 static int param_get_slot_table_size(char *buffer, struct kernel_param *kp)
2645 {
2646 return param_get_uint(buffer, kp);
2647 }
2648 #define param_check_slot_table_size(name, p) \
2649 __param_check(name, p, unsigned int);
2650
2651 module_param_named(tcp_slot_table_entries, xprt_tcp_slot_table_entries,
2652 slot_table_size, 0644);
2653 module_param_named(udp_slot_table_entries, xprt_udp_slot_table_entries,
2654 slot_table_size, 0644);
2655
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree