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hide spinlock in linux/quota.h behind __KERNEL__
[linux-2.6/mini2440.git] / net / sunrpc / xprtsock.c
blobcc33c5880abb477eb3cdb7d415e2f7df91f303b1
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 Software <alan@redhat.com>
7 * TCP send fixes (C) 1998 Red Hat Software <alan@redhat.com>
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
18 #include <linux/types.h>
19 #include <linux/slab.h>
20 #include <linux/capability.h>
21 #include <linux/pagemap.h>
22 #include <linux/errno.h>
23 #include <linux/socket.h>
24 #include <linux/in.h>
25 #include <linux/net.h>
26 #include <linux/mm.h>
27 #include <linux/udp.h>
28 #include <linux/tcp.h>
29 #include <linux/sunrpc/clnt.h>
30 #include <linux/sunrpc/sched.h>
31 #include <linux/file.h>
32
33 #include <net/sock.h>
34 #include <net/checksum.h>
35 #include <net/udp.h>
36 #include <net/tcp.h>
37
38 /*
39 * xprtsock tunables
40 */
41 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
42 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
43
44 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
45 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
46
47 /*
48 * We can register our own files under /proc/sys/sunrpc by
49 * calling register_sysctl_table() again. The files in that
50 * directory become the union of all files registered there.
51 *
52 * We simply need to make sure that we don't collide with
53 * someone else's file names!
54 */
55
56 #ifdef RPC_DEBUG
57
58 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
59 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
60 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
61 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
62
63 static struct ctl_table_header *sunrpc_table_header;
64
65 /*
66 * FIXME: changing the UDP slot table size should also resize the UDP
67 * socket buffers for existing UDP transports
68 */
69 static ctl_table xs_tunables_table[] = {
70 {
71 .ctl_name = CTL_SLOTTABLE_UDP,
72 .procname = "udp_slot_table_entries",
73 .data = &xprt_udp_slot_table_entries,
74 .maxlen = sizeof(unsigned int),
75 .mode = 0644,
76 .proc_handler = &proc_dointvec_minmax,
77 .strategy = &sysctl_intvec,
78 .extra1 = &min_slot_table_size,
79 .extra2 = &max_slot_table_size
80 },
81 {
82 .ctl_name = CTL_SLOTTABLE_TCP,
83 .procname = "tcp_slot_table_entries",
84 .data = &xprt_tcp_slot_table_entries,
85 .maxlen = sizeof(unsigned int),
86 .mode = 0644,
87 .proc_handler = &proc_dointvec_minmax,
88 .strategy = &sysctl_intvec,
89 .extra1 = &min_slot_table_size,
90 .extra2 = &max_slot_table_size
91 },
92 {
93 .ctl_name = CTL_MIN_RESVPORT,
94 .procname = "min_resvport",
95 .data = &xprt_min_resvport,
96 .maxlen = sizeof(unsigned int),
97 .mode = 0644,
98 .proc_handler = &proc_dointvec_minmax,
99 .strategy = &sysctl_intvec,
100 .extra1 = &xprt_min_resvport_limit,
101 .extra2 = &xprt_max_resvport_limit
102 },
103 {
104 .ctl_name = CTL_MAX_RESVPORT,
105 .procname = "max_resvport",
106 .data = &xprt_max_resvport,
107 .maxlen = sizeof(unsigned int),
108 .mode = 0644,
109 .proc_handler = &proc_dointvec_minmax,
110 .strategy = &sysctl_intvec,
111 .extra1 = &xprt_min_resvport_limit,
112 .extra2 = &xprt_max_resvport_limit
113 },
114 {
115 .ctl_name = 0,
116 },
117 };
118
119 static ctl_table sunrpc_table[] = {
120 {
121 .ctl_name = CTL_SUNRPC,
122 .procname = "sunrpc",
123 .mode = 0555,
124 .child = xs_tunables_table
125 },
126 {
127 .ctl_name = 0,
128 },
129 };
130
131 #endif
132
133 /*
134 * How many times to try sending a request on a socket before waiting
135 * for the socket buffer to clear.
136 */
137 #define XS_SENDMSG_RETRY (10U)
138
139 /*
140 * Time out for an RPC UDP socket connect. UDP socket connects are
141 * synchronous, but we set a timeout anyway in case of resource
142 * exhaustion on the local host.
143 */
144 #define XS_UDP_CONN_TO (5U * HZ)
145
146 /*
147 * Wait duration for an RPC TCP connection to be established. Solaris
148 * NFS over TCP uses 60 seconds, for example, which is in line with how
149 * long a server takes to reboot.
150 */
151 #define XS_TCP_CONN_TO (60U * HZ)
152
153 /*
154 * Wait duration for a reply from the RPC portmapper.
155 */
156 #define XS_BIND_TO (60U * HZ)
157
158 /*
159 * Delay if a UDP socket connect error occurs. This is most likely some
160 * kind of resource problem on the local host.
161 */
162 #define XS_UDP_REEST_TO (2U * HZ)
163
164 /*
165 * The reestablish timeout allows clients to delay for a bit before attempting
166 * to reconnect to a server that just dropped our connection.
167 *
168 * We implement an exponential backoff when trying to reestablish a TCP
169 * transport connection with the server. Some servers like to drop a TCP
170 * connection when they are overworked, so we start with a short timeout and
171 * increase over time if the server is down or not responding.
172 */
173 #define XS_TCP_INIT_REEST_TO (3U * HZ)
174 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
175
176 /*
177 * TCP idle timeout; client drops the transport socket if it is idle
178 * for this long. Note that we also timeout UDP sockets to prevent
179 * holding port numbers when there is no RPC traffic.
180 */
181 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
182
183 #ifdef RPC_DEBUG
184 # undef RPC_DEBUG_DATA
185 # define RPCDBG_FACILITY RPCDBG_TRANS
186 #endif
187
188 #ifdef RPC_DEBUG_DATA
189 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
190 {
191 u8 *buf = (u8 *) packet;
192 int j;
193
194 dprintk("RPC: %s\n", msg);
195 for (j = 0; j < count && j < 128; j += 4) {
196 if (!(j & 31)) {
197 if (j)
198 dprintk("\n");
199 dprintk("0x%04x ", j);
200 }
201 dprintk("%02x%02x%02x%02x ",
202 buf[j], buf[j+1], buf[j+2], buf[j+3]);
203 }
204 dprintk("\n");
205 }
206 #else
207 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
208 {
209 /* NOP */
210 }
211 #endif
212
213 struct sock_xprt {
214 struct rpc_xprt xprt;
215
216 /*
217 * Network layer
218 */
219 struct socket * sock;
220 struct sock * inet;
221
222 /*
223 * State of TCP reply receive
224 */
225 __be32 tcp_fraghdr,
226 tcp_xid;
227
228 u32 tcp_offset,
229 tcp_reclen;
230
231 unsigned long tcp_copied,
232 tcp_flags;
233
234 /*
235 * Connection of transports
236 */
237 struct delayed_work connect_worker;
238 unsigned short port;
239
240 /*
241 * UDP socket buffer size parameters
242 */
243 size_t rcvsize,
244 sndsize;
245
246 /*
247 * Saved socket callback addresses
248 */
249 void (*old_data_ready)(struct sock *, int);
250 void (*old_state_change)(struct sock *);
251 void (*old_write_space)(struct sock *);
252 };
253
254 /*
255 * TCP receive state flags
256 */
257 #define TCP_RCV_LAST_FRAG (1UL << 0)
258 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
259 #define TCP_RCV_COPY_XID (1UL << 2)
260 #define TCP_RCV_COPY_DATA (1UL << 3)
261
262 static void xs_format_peer_addresses(struct rpc_xprt *xprt)
263 {
264 struct sockaddr_in *addr = (struct sockaddr_in *) &xprt->addr;
265 char *buf;
266
267 buf = kzalloc(20, GFP_KERNEL);
268 if (buf) {
269 snprintf(buf, 20, "%u.%u.%u.%u",
270 NIPQUAD(addr->sin_addr.s_addr));
271 }
272 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
273
274 buf = kzalloc(8, GFP_KERNEL);
275 if (buf) {
276 snprintf(buf, 8, "%u",
277 ntohs(addr->sin_port));
278 }
279 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
280
281 if (xprt->prot == IPPROTO_UDP)
282 xprt->address_strings[RPC_DISPLAY_PROTO] = "udp";
283 else
284 xprt->address_strings[RPC_DISPLAY_PROTO] = "tcp";
285
286 buf = kzalloc(48, GFP_KERNEL);
287 if (buf) {
288 snprintf(buf, 48, "addr=%u.%u.%u.%u port=%u proto=%s",
289 NIPQUAD(addr->sin_addr.s_addr),
290 ntohs(addr->sin_port),
291 xprt->prot == IPPROTO_UDP ? "udp" : "tcp");
292 }
293 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
294 }
295
296 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
297 {
298 kfree(xprt->address_strings[RPC_DISPLAY_ADDR]);
299 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
300 kfree(xprt->address_strings[RPC_DISPLAY_ALL]);
301 }
302
303 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
304
305 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
306 {
307 struct msghdr msg = {
308 .msg_name = addr,
309 .msg_namelen = addrlen,
310 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
311 };
312 struct kvec iov = {
313 .iov_base = vec->iov_base + base,
314 .iov_len = vec->iov_len - base,
315 };
316
317 if (iov.iov_len != 0)
318 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
319 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
320 }
321
322 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
323 {
324 struct page **ppage;
325 unsigned int remainder;
326 int err, sent = 0;
327
328 remainder = xdr->page_len - base;
329 base += xdr->page_base;
330 ppage = xdr->pages + (base >> PAGE_SHIFT);
331 base &= ~PAGE_MASK;
332 for(;;) {
333 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
334 int flags = XS_SENDMSG_FLAGS;
335
336 remainder -= len;
337 if (remainder != 0 || more)
338 flags |= MSG_MORE;
339 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
340 if (remainder == 0 || err != len)
341 break;
342 sent += err;
343 ppage++;
344 base = 0;
345 }
346 if (sent == 0)
347 return err;
348 if (err > 0)
349 sent += err;
350 return sent;
351 }
352
353 /**
354 * xs_sendpages - write pages directly to a socket
355 * @sock: socket to send on
356 * @addr: UDP only -- address of destination
357 * @addrlen: UDP only -- length of destination address
358 * @xdr: buffer containing this request
359 * @base: starting position in the buffer
360 *
361 */
362 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
363 {
364 unsigned int remainder = xdr->len - base;
365 int err, sent = 0;
366
367 if (unlikely(!sock))
368 return -ENOTCONN;
369
370 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
371 if (base != 0) {
372 addr = NULL;
373 addrlen = 0;
374 }
375
376 if (base < xdr->head[0].iov_len || addr != NULL) {
377 unsigned int len = xdr->head[0].iov_len - base;
378 remainder -= len;
379 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
380 if (remainder == 0 || err != len)
381 goto out;
382 sent += err;
383 base = 0;
384 } else
385 base -= xdr->head[0].iov_len;
386
387 if (base < xdr->page_len) {
388 unsigned int len = xdr->page_len - base;
389 remainder -= len;
390 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
391 if (remainder == 0 || err != len)
392 goto out;
393 sent += err;
394 base = 0;
395 } else
396 base -= xdr->page_len;
397
398 if (base >= xdr->tail[0].iov_len)
399 return sent;
400 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
401 out:
402 if (sent == 0)
403 return err;
404 if (err > 0)
405 sent += err;
406 return sent;
407 }
408
409 /**
410 * xs_nospace - place task on wait queue if transmit was incomplete
411 * @task: task to put to sleep
412 *
413 */
414 static void xs_nospace(struct rpc_task *task)
415 {
416 struct rpc_rqst *req = task->tk_rqstp;
417 struct rpc_xprt *xprt = req->rq_xprt;
418 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
419
420 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
421 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
422 req->rq_slen);
423
424 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
425 /* Protect against races with write_space */
426 spin_lock_bh(&xprt->transport_lock);
427
428 /* Don't race with disconnect */
429 if (!xprt_connected(xprt))
430 task->tk_status = -ENOTCONN;
431 else if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
432 xprt_wait_for_buffer_space(task);
433
434 spin_unlock_bh(&xprt->transport_lock);
435 } else
436 /* Keep holding the socket if it is blocked */
437 rpc_delay(task, HZ>>4);
438 }
439
440 /**
441 * xs_udp_send_request - write an RPC request to a UDP socket
442 * @task: address of RPC task that manages the state of an RPC request
443 *
444 * Return values:
445 * 0: The request has been sent
446 * EAGAIN: The socket was blocked, please call again later to
447 * complete the request
448 * ENOTCONN: Caller needs to invoke connect logic then call again
449 * other: Some other error occured, the request was not sent
450 */
451 static int xs_udp_send_request(struct rpc_task *task)
452 {
453 struct rpc_rqst *req = task->tk_rqstp;
454 struct rpc_xprt *xprt = req->rq_xprt;
455 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
456 struct xdr_buf *xdr = &req->rq_snd_buf;
457 int status;
458
459 xs_pktdump("packet data:",
460 req->rq_svec->iov_base,
461 req->rq_svec->iov_len);
462
463 req->rq_xtime = jiffies;
464 status = xs_sendpages(transport->sock,
465 (struct sockaddr *) &xprt->addr,
466 xprt->addrlen, xdr,
467 req->rq_bytes_sent);
468
469 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
470 xdr->len - req->rq_bytes_sent, status);
471
472 if (likely(status >= (int) req->rq_slen))
473 return 0;
474
475 /* Still some bytes left; set up for a retry later. */
476 if (status > 0)
477 status = -EAGAIN;
478
479 switch (status) {
480 case -ENETUNREACH:
481 case -EPIPE:
482 case -ECONNREFUSED:
483 /* When the server has died, an ICMP port unreachable message
484 * prompts ECONNREFUSED. */
485 break;
486 case -EAGAIN:
487 xs_nospace(task);
488 break;
489 default:
490 dprintk("RPC: sendmsg returned unrecognized error %d\n",
491 -status);
492 break;
493 }
494
495 return status;
496 }
497
498 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
499 {
500 u32 reclen = buf->len - sizeof(rpc_fraghdr);
501 rpc_fraghdr *base = buf->head[0].iov_base;
502 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
503 }
504
505 /**
506 * xs_tcp_send_request - write an RPC request to a TCP socket
507 * @task: address of RPC task that manages the state of an RPC request
508 *
509 * Return values:
510 * 0: The request has been sent
511 * EAGAIN: The socket was blocked, please call again later to
512 * complete the request
513 * ENOTCONN: Caller needs to invoke connect logic then call again
514 * other: Some other error occured, the request was not sent
515 *
516 * XXX: In the case of soft timeouts, should we eventually give up
517 * if sendmsg is not able to make progress?
518 */
519 static int xs_tcp_send_request(struct rpc_task *task)
520 {
521 struct rpc_rqst *req = task->tk_rqstp;
522 struct rpc_xprt *xprt = req->rq_xprt;
523 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
524 struct xdr_buf *xdr = &req->rq_snd_buf;
525 int status, retry = 0;
526
527 xs_encode_tcp_record_marker(&req->rq_snd_buf);
528
529 xs_pktdump("packet data:",
530 req->rq_svec->iov_base,
531 req->rq_svec->iov_len);
532
533 /* Continue transmitting the packet/record. We must be careful
534 * to cope with writespace callbacks arriving _after_ we have
535 * called sendmsg(). */
536 while (1) {
537 req->rq_xtime = jiffies;
538 status = xs_sendpages(transport->sock,
539 NULL, 0, xdr, req->rq_bytes_sent);
540
541 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
542 xdr->len - req->rq_bytes_sent, status);
543
544 if (unlikely(status < 0))
545 break;
546
547 /* If we've sent the entire packet, immediately
548 * reset the count of bytes sent. */
549 req->rq_bytes_sent += status;
550 task->tk_bytes_sent += status;
551 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
552 req->rq_bytes_sent = 0;
553 return 0;
554 }
555
556 status = -EAGAIN;
557 if (retry++ > XS_SENDMSG_RETRY)
558 break;
559 }
560
561 switch (status) {
562 case -EAGAIN:
563 xs_nospace(task);
564 break;
565 case -ECONNREFUSED:
566 case -ECONNRESET:
567 case -ENOTCONN:
568 case -EPIPE:
569 status = -ENOTCONN;
570 break;
571 default:
572 dprintk("RPC: sendmsg returned unrecognized error %d\n",
573 -status);
574 xprt_disconnect(xprt);
575 break;
576 }
577
578 return status;
579 }
580
581 /**
582 * xs_tcp_release_xprt - clean up after a tcp transmission
583 * @xprt: transport
584 * @task: rpc task
585 *
586 * This cleans up if an error causes us to abort the transmission of a request.
587 * In this case, the socket may need to be reset in order to avoid confusing
588 * the server.
589 */
590 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
591 {
592 struct rpc_rqst *req;
593
594 if (task != xprt->snd_task)
595 return;
596 if (task == NULL)
597 goto out_release;
598 req = task->tk_rqstp;
599 if (req->rq_bytes_sent == 0)
600 goto out_release;
601 if (req->rq_bytes_sent == req->rq_snd_buf.len)
602 goto out_release;
603 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
604 out_release:
605 xprt_release_xprt(xprt, task);
606 }
607
608 /**
609 * xs_close - close a socket
610 * @xprt: transport
611 *
612 * This is used when all requests are complete; ie, no DRC state remains
613 * on the server we want to save.
614 */
615 static void xs_close(struct rpc_xprt *xprt)
616 {
617 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
618 struct socket *sock = transport->sock;
619 struct sock *sk = transport->inet;
620
621 if (!sk)
622 goto clear_close_wait;
623
624 dprintk("RPC: xs_close xprt %p\n", xprt);
625
626 write_lock_bh(&sk->sk_callback_lock);
627 transport->inet = NULL;
628 transport->sock = NULL;
629
630 sk->sk_user_data = NULL;
631 sk->sk_data_ready = transport->old_data_ready;
632 sk->sk_state_change = transport->old_state_change;
633 sk->sk_write_space = transport->old_write_space;
634 write_unlock_bh(&sk->sk_callback_lock);
635
636 sk->sk_no_check = 0;
637
638 sock_release(sock);
639 clear_close_wait:
640 smp_mb__before_clear_bit();
641 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
642 smp_mb__after_clear_bit();
643 }
644
645 /**
646 * xs_destroy - prepare to shutdown a transport
647 * @xprt: doomed transport
648 *
649 */
650 static void xs_destroy(struct rpc_xprt *xprt)
651 {
652 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
653
654 dprintk("RPC: xs_destroy xprt %p\n", xprt);
655
656 cancel_delayed_work(&transport->connect_worker);
657 flush_scheduled_work();
658
659 xprt_disconnect(xprt);
660 xs_close(xprt);
661 xs_free_peer_addresses(xprt);
662 kfree(xprt->slot);
663 kfree(xprt);
664 }
665
666 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
667 {
668 return (struct rpc_xprt *) sk->sk_user_data;
669 }
670
671 /**
672 * xs_udp_data_ready - "data ready" callback for UDP sockets
673 * @sk: socket with data to read
674 * @len: how much data to read
675 *
676 */
677 static void xs_udp_data_ready(struct sock *sk, int len)
678 {
679 struct rpc_task *task;
680 struct rpc_xprt *xprt;
681 struct rpc_rqst *rovr;
682 struct sk_buff *skb;
683 int err, repsize, copied;
684 u32 _xid;
685 __be32 *xp;
686
687 read_lock(&sk->sk_callback_lock);
688 dprintk("RPC: xs_udp_data_ready...\n");
689 if (!(xprt = xprt_from_sock(sk)))
690 goto out;
691
692 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
693 goto out;
694
695 if (xprt->shutdown)
696 goto dropit;
697
698 repsize = skb->len - sizeof(struct udphdr);
699 if (repsize < 4) {
700 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
701 goto dropit;
702 }
703
704 /* Copy the XID from the skb... */
705 xp = skb_header_pointer(skb, sizeof(struct udphdr),
706 sizeof(_xid), &_xid);
707 if (xp == NULL)
708 goto dropit;
709
710 /* Look up and lock the request corresponding to the given XID */
711 spin_lock(&xprt->transport_lock);
712 rovr = xprt_lookup_rqst(xprt, *xp);
713 if (!rovr)
714 goto out_unlock;
715 task = rovr->rq_task;
716
717 if ((copied = rovr->rq_private_buf.buflen) > repsize)
718 copied = repsize;
719
720 /* Suck it into the iovec, verify checksum if not done by hw. */
721 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb))
722 goto out_unlock;
723
724 /* Something worked... */
725 dst_confirm(skb->dst);
726
727 xprt_adjust_cwnd(task, copied);
728 xprt_update_rtt(task);
729 xprt_complete_rqst(task, copied);
730
731 out_unlock:
732 spin_unlock(&xprt->transport_lock);
733 dropit:
734 skb_free_datagram(sk, skb);
735 out:
736 read_unlock(&sk->sk_callback_lock);
737 }
738
739 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
740 {
741 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
742 size_t len, used;
743 char *p;
744
745 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
746 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
747 used = xdr_skb_read_bits(desc, p, len);
748 transport->tcp_offset += used;
749 if (used != len)
750 return;
751
752 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
753 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
754 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
755 else
756 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
757 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
758
759 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
760 transport->tcp_offset = 0;
761
762 /* Sanity check of the record length */
763 if (unlikely(transport->tcp_reclen < 4)) {
764 dprintk("RPC: invalid TCP record fragment length\n");
765 xprt_disconnect(xprt);
766 return;
767 }
768 dprintk("RPC: reading TCP record fragment of length %d\n",
769 transport->tcp_reclen);
770 }
771
772 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
773 {
774 if (transport->tcp_offset == transport->tcp_reclen) {
775 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
776 transport->tcp_offset = 0;
777 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
778 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
779 transport->tcp_flags |= TCP_RCV_COPY_XID;
780 transport->tcp_copied = 0;
781 }
782 }
783 }
784
785 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
786 {
787 size_t len, used;
788 char *p;
789
790 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
791 dprintk("RPC: reading XID (%Zu bytes)\n", len);
792 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
793 used = xdr_skb_read_bits(desc, p, len);
794 transport->tcp_offset += used;
795 if (used != len)
796 return;
797 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
798 transport->tcp_flags |= TCP_RCV_COPY_DATA;
799 transport->tcp_copied = 4;
800 dprintk("RPC: reading reply for XID %08x\n",
801 ntohl(transport->tcp_xid));
802 xs_tcp_check_fraghdr(transport);
803 }
804
805 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
806 {
807 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
808 struct rpc_rqst *req;
809 struct xdr_buf *rcvbuf;
810 size_t len;
811 ssize_t r;
812
813 /* Find and lock the request corresponding to this xid */
814 spin_lock(&xprt->transport_lock);
815 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
816 if (!req) {
817 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
818 dprintk("RPC: XID %08x request not found!\n",
819 ntohl(transport->tcp_xid));
820 spin_unlock(&xprt->transport_lock);
821 return;
822 }
823
824 rcvbuf = &req->rq_private_buf;
825 len = desc->count;
826 if (len > transport->tcp_reclen - transport->tcp_offset) {
827 struct xdr_skb_reader my_desc;
828
829 len = transport->tcp_reclen - transport->tcp_offset;
830 memcpy(&my_desc, desc, sizeof(my_desc));
831 my_desc.count = len;
832 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
833 &my_desc, xdr_skb_read_bits);
834 desc->count -= r;
835 desc->offset += r;
836 } else
837 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
838 desc, xdr_skb_read_bits);
839
840 if (r > 0) {
841 transport->tcp_copied += r;
842 transport->tcp_offset += r;
843 }
844 if (r != len) {
845 /* Error when copying to the receive buffer,
846 * usually because we weren't able to allocate
847 * additional buffer pages. All we can do now
848 * is turn off TCP_RCV_COPY_DATA, so the request
849 * will not receive any additional updates,
850 * and time out.
851 * Any remaining data from this record will
852 * be discarded.
853 */
854 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
855 dprintk("RPC: XID %08x truncated request\n",
856 ntohl(transport->tcp_xid));
857 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
858 "tcp_offset = %u, tcp_reclen = %u\n",
859 xprt, transport->tcp_copied,
860 transport->tcp_offset, transport->tcp_reclen);
861 goto out;
862 }
863
864 dprintk("RPC: XID %08x read %Zd bytes\n",
865 ntohl(transport->tcp_xid), r);
866 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
867 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
868 transport->tcp_offset, transport->tcp_reclen);
869
870 if (transport->tcp_copied == req->rq_private_buf.buflen)
871 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
872 else if (transport->tcp_offset == transport->tcp_reclen) {
873 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
874 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
875 }
876
877 out:
878 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
879 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
880 spin_unlock(&xprt->transport_lock);
881 xs_tcp_check_fraghdr(transport);
882 }
883
884 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
885 {
886 size_t len;
887
888 len = transport->tcp_reclen - transport->tcp_offset;
889 if (len > desc->count)
890 len = desc->count;
891 desc->count -= len;
892 desc->offset += len;
893 transport->tcp_offset += len;
894 dprintk("RPC: discarded %Zu bytes\n", len);
895 xs_tcp_check_fraghdr(transport);
896 }
897
898 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
899 {
900 struct rpc_xprt *xprt = rd_desc->arg.data;
901 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
902 struct xdr_skb_reader desc = {
903 .skb = skb,
904 .offset = offset,
905 .count = len,
906 };
907
908 dprintk("RPC: xs_tcp_data_recv started\n");
909 do {
910 /* Read in a new fragment marker if necessary */
911 /* Can we ever really expect to get completely empty fragments? */
912 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
913 xs_tcp_read_fraghdr(xprt, &desc);
914 continue;
915 }
916 /* Read in the xid if necessary */
917 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
918 xs_tcp_read_xid(transport, &desc);
919 continue;
920 }
921 /* Read in the request data */
922 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
923 xs_tcp_read_request(xprt, &desc);
924 continue;
925 }
926 /* Skip over any trailing bytes on short reads */
927 xs_tcp_read_discard(transport, &desc);
928 } while (desc.count);
929 dprintk("RPC: xs_tcp_data_recv done\n");
930 return len - desc.count;
931 }
932
933 /**
934 * xs_tcp_data_ready - "data ready" callback for TCP sockets
935 * @sk: socket with data to read
936 * @bytes: how much data to read
937 *
938 */
939 static void xs_tcp_data_ready(struct sock *sk, int bytes)
940 {
941 struct rpc_xprt *xprt;
942 read_descriptor_t rd_desc;
943
944 dprintk("RPC: xs_tcp_data_ready...\n");
945
946 read_lock(&sk->sk_callback_lock);
947 if (!(xprt = xprt_from_sock(sk)))
948 goto out;
949 if (xprt->shutdown)
950 goto out;
951
952 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
953 rd_desc.arg.data = xprt;
954 rd_desc.count = 65536;
955 tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
956 out:
957 read_unlock(&sk->sk_callback_lock);
958 }
959
960 /**
961 * xs_tcp_state_change - callback to handle TCP socket state changes
962 * @sk: socket whose state has changed
963 *
964 */
965 static void xs_tcp_state_change(struct sock *sk)
966 {
967 struct rpc_xprt *xprt;
968
969 read_lock(&sk->sk_callback_lock);
970 if (!(xprt = xprt_from_sock(sk)))
971 goto out;
972 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
973 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
974 sk->sk_state, xprt_connected(xprt),
975 sock_flag(sk, SOCK_DEAD),
976 sock_flag(sk, SOCK_ZAPPED));
977
978 switch (sk->sk_state) {
979 case TCP_ESTABLISHED:
980 spin_lock_bh(&xprt->transport_lock);
981 if (!xprt_test_and_set_connected(xprt)) {
982 struct sock_xprt *transport = container_of(xprt,
983 struct sock_xprt, xprt);
984
985 /* Reset TCP record info */
986 transport->tcp_offset = 0;
987 transport->tcp_reclen = 0;
988 transport->tcp_copied = 0;
989 transport->tcp_flags =
990 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
991
992 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
993 xprt_wake_pending_tasks(xprt, 0);
994 }
995 spin_unlock_bh(&xprt->transport_lock);
996 break;
997 case TCP_SYN_SENT:
998 case TCP_SYN_RECV:
999 break;
1000 case TCP_CLOSE_WAIT:
1001 /* Try to schedule an autoclose RPC calls */
1002 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
1003 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
1004 schedule_work(&xprt->task_cleanup);
1005 default:
1006 xprt_disconnect(xprt);
1007 }
1008 out:
1009 read_unlock(&sk->sk_callback_lock);
1010 }
1011
1012 /**
1013 * xs_udp_write_space - callback invoked when socket buffer space
1014 * becomes available
1015 * @sk: socket whose state has changed
1016 *
1017 * Called when more output buffer space is available for this socket.
1018 * We try not to wake our writers until they can make "significant"
1019 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1020 * with a bunch of small requests.
1021 */
1022 static void xs_udp_write_space(struct sock *sk)
1023 {
1024 read_lock(&sk->sk_callback_lock);
1025
1026 /* from net/core/sock.c:sock_def_write_space */
1027 if (sock_writeable(sk)) {
1028 struct socket *sock;
1029 struct rpc_xprt *xprt;
1030
1031 if (unlikely(!(sock = sk->sk_socket)))
1032 goto out;
1033 if (unlikely(!(xprt = xprt_from_sock(sk))))
1034 goto out;
1035 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1036 goto out;
1037
1038 xprt_write_space(xprt);
1039 }
1040
1041 out:
1042 read_unlock(&sk->sk_callback_lock);
1043 }
1044
1045 /**
1046 * xs_tcp_write_space - callback invoked when socket buffer space
1047 * becomes available
1048 * @sk: socket whose state has changed
1049 *
1050 * Called when more output buffer space is available for this socket.
1051 * We try not to wake our writers until they can make "significant"
1052 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1053 * with a bunch of small requests.
1054 */
1055 static void xs_tcp_write_space(struct sock *sk)
1056 {
1057 read_lock(&sk->sk_callback_lock);
1058
1059 /* from net/core/stream.c:sk_stream_write_space */
1060 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1061 struct socket *sock;
1062 struct rpc_xprt *xprt;
1063
1064 if (unlikely(!(sock = sk->sk_socket)))
1065 goto out;
1066 if (unlikely(!(xprt = xprt_from_sock(sk))))
1067 goto out;
1068 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1069 goto out;
1070
1071 xprt_write_space(xprt);
1072 }
1073
1074 out:
1075 read_unlock(&sk->sk_callback_lock);
1076 }
1077
1078 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1079 {
1080 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1081 struct sock *sk = transport->inet;
1082
1083 if (transport->rcvsize) {
1084 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1085 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1086 }
1087 if (transport->sndsize) {
1088 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1089 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1090 sk->sk_write_space(sk);
1091 }
1092 }
1093
1094 /**
1095 * xs_udp_set_buffer_size - set send and receive limits
1096 * @xprt: generic transport
1097 * @sndsize: requested size of send buffer, in bytes
1098 * @rcvsize: requested size of receive buffer, in bytes
1099 *
1100 * Set socket send and receive buffer size limits.
1101 */
1102 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1103 {
1104 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1105
1106 transport->sndsize = 0;
1107 if (sndsize)
1108 transport->sndsize = sndsize + 1024;
1109 transport->rcvsize = 0;
1110 if (rcvsize)
1111 transport->rcvsize = rcvsize + 1024;
1112
1113 xs_udp_do_set_buffer_size(xprt);
1114 }
1115
1116 /**
1117 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1118 * @task: task that timed out
1119 *
1120 * Adjust the congestion window after a retransmit timeout has occurred.
1121 */
1122 static void xs_udp_timer(struct rpc_task *task)
1123 {
1124 xprt_adjust_cwnd(task, -ETIMEDOUT);
1125 }
1126
1127 static unsigned short xs_get_random_port(void)
1128 {
1129 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1130 unsigned short rand = (unsigned short) net_random() % range;
1131 return rand + xprt_min_resvport;
1132 }
1133
1134 /**
1135 * xs_set_port - reset the port number in the remote endpoint address
1136 * @xprt: generic transport
1137 * @port: new port number
1138 *
1139 */
1140 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1141 {
1142 struct sockaddr_in *sap = (struct sockaddr_in *) &xprt->addr;
1143
1144 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1145
1146 sap->sin_port = htons(port);
1147 }
1148
1149 static int xs_bindresvport(struct sock_xprt *transport, struct socket *sock)
1150 {
1151 struct sockaddr_in myaddr = {
1152 .sin_family = AF_INET,
1153 };
1154 int err;
1155 unsigned short port = transport->port;
1156
1157 do {
1158 myaddr.sin_port = htons(port);
1159 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1160 sizeof(myaddr));
1161 if (err == 0) {
1162 transport->port = port;
1163 dprintk("RPC: xs_bindresvport bound to port %u\n",
1164 port);
1165 return 0;
1166 }
1167 if (port <= xprt_min_resvport)
1168 port = xprt_max_resvport;
1169 else
1170 port--;
1171 } while (err == -EADDRINUSE && port != transport->port);
1172
1173 dprintk("RPC: can't bind to reserved port (%d).\n", -err);
1174 return err;
1175 }
1176
1177 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1178 static struct lock_class_key xs_key[2];
1179 static struct lock_class_key xs_slock_key[2];
1180
1181 static inline void xs_reclassify_socket(struct socket *sock)
1182 {
1183 struct sock *sk = sock->sk;
1184 BUG_ON(sk->sk_lock.owner != NULL);
1185 switch (sk->sk_family) {
1186 case AF_INET:
1187 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFS",
1188 &xs_slock_key[0], "sk_lock-AF_INET-NFS", &xs_key[0]);
1189 break;
1190
1191 case AF_INET6:
1192 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFS",
1193 &xs_slock_key[1], "sk_lock-AF_INET6-NFS", &xs_key[1]);
1194 break;
1195
1196 default:
1197 BUG();
1198 }
1199 }
1200 #else
1201 static inline void xs_reclassify_socket(struct socket *sock)
1202 {
1203 }
1204 #endif
1205
1206 /**
1207 * xs_udp_connect_worker - set up a UDP socket
1208 * @work: RPC transport to connect
1209 *
1210 * Invoked by a work queue tasklet.
1211 */
1212 static void xs_udp_connect_worker(struct work_struct *work)
1213 {
1214 struct sock_xprt *transport =
1215 container_of(work, struct sock_xprt, connect_worker.work);
1216 struct rpc_xprt *xprt = &transport->xprt;
1217 struct socket *sock = transport->sock;
1218 int err, status = -EIO;
1219
1220 if (xprt->shutdown || !xprt_bound(xprt))
1221 goto out;
1222
1223 /* Start by resetting any existing state */
1224 xs_close(xprt);
1225
1226 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1227 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1228 goto out;
1229 }
1230 xs_reclassify_socket(sock);
1231
1232 if (xprt->resvport && xs_bindresvport(transport, sock) < 0) {
1233 sock_release(sock);
1234 goto out;
1235 }
1236
1237 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1238 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1239
1240 if (!transport->inet) {
1241 struct sock *sk = sock->sk;
1242
1243 write_lock_bh(&sk->sk_callback_lock);
1244
1245 sk->sk_user_data = xprt;
1246 transport->old_data_ready = sk->sk_data_ready;
1247 transport->old_state_change = sk->sk_state_change;
1248 transport->old_write_space = sk->sk_write_space;
1249 sk->sk_data_ready = xs_udp_data_ready;
1250 sk->sk_write_space = xs_udp_write_space;
1251 sk->sk_no_check = UDP_CSUM_NORCV;
1252 sk->sk_allocation = GFP_ATOMIC;
1253
1254 xprt_set_connected(xprt);
1255
1256 /* Reset to new socket */
1257 transport->sock = sock;
1258 transport->inet = sk;
1259
1260 write_unlock_bh(&sk->sk_callback_lock);
1261 }
1262 xs_udp_do_set_buffer_size(xprt);
1263 status = 0;
1264 out:
1265 xprt_wake_pending_tasks(xprt, status);
1266 xprt_clear_connecting(xprt);
1267 }
1268
1269 /*
1270 * We need to preserve the port number so the reply cache on the server can
1271 * find our cached RPC replies when we get around to reconnecting.
1272 */
1273 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1274 {
1275 int result;
1276 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1277 struct sockaddr any;
1278
1279 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1280
1281 /*
1282 * Disconnect the transport socket by doing a connect operation
1283 * with AF_UNSPEC. This should return immediately...
1284 */
1285 memset(&any, 0, sizeof(any));
1286 any.sa_family = AF_UNSPEC;
1287 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1288 if (result)
1289 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1290 result);
1291 }
1292
1293 /**
1294 * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint
1295 * @work: RPC transport to connect
1296 *
1297 * Invoked by a work queue tasklet.
1298 */
1299 static void xs_tcp_connect_worker(struct work_struct *work)
1300 {
1301 struct sock_xprt *transport =
1302 container_of(work, struct sock_xprt, connect_worker.work);
1303 struct rpc_xprt *xprt = &transport->xprt;
1304 struct socket *sock = transport->sock;
1305 int err, status = -EIO;
1306
1307 if (xprt->shutdown || !xprt_bound(xprt))
1308 goto out;
1309
1310 if (!sock) {
1311 /* start from scratch */
1312 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1313 dprintk("RPC: can't create TCP transport "
1314 "socket (%d).\n", -err);
1315 goto out;
1316 }
1317 xs_reclassify_socket(sock);
1318
1319 if (xprt->resvport && xs_bindresvport(transport, sock) < 0) {
1320 sock_release(sock);
1321 goto out;
1322 }
1323 } else
1324 /* "close" the socket, preserving the local port */
1325 xs_tcp_reuse_connection(xprt);
1326
1327 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1328 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1329
1330 if (!transport->inet) {
1331 struct sock *sk = sock->sk;
1332
1333 write_lock_bh(&sk->sk_callback_lock);
1334
1335 sk->sk_user_data = xprt;
1336 transport->old_data_ready = sk->sk_data_ready;
1337 transport->old_state_change = sk->sk_state_change;
1338 transport->old_write_space = sk->sk_write_space;
1339 sk->sk_data_ready = xs_tcp_data_ready;
1340 sk->sk_state_change = xs_tcp_state_change;
1341 sk->sk_write_space = xs_tcp_write_space;
1342 sk->sk_allocation = GFP_ATOMIC;
1343
1344 /* socket options */
1345 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1346 sock_reset_flag(sk, SOCK_LINGER);
1347 tcp_sk(sk)->linger2 = 0;
1348 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1349
1350 xprt_clear_connected(xprt);
1351
1352 /* Reset to new socket */
1353 transport->sock = sock;
1354 transport->inet = sk;
1355
1356 write_unlock_bh(&sk->sk_callback_lock);
1357 }
1358
1359 /* Tell the socket layer to start connecting... */
1360 xprt->stat.connect_count++;
1361 xprt->stat.connect_start = jiffies;
1362 status = kernel_connect(sock, (struct sockaddr *) &xprt->addr,
1363 xprt->addrlen, O_NONBLOCK);
1364 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1365 xprt, -status, xprt_connected(xprt),
1366 sock->sk->sk_state);
1367 if (status < 0) {
1368 switch (status) {
1369 case -EINPROGRESS:
1370 case -EALREADY:
1371 goto out_clear;
1372 case -ECONNREFUSED:
1373 case -ECONNRESET:
1374 /* retry with existing socket, after a delay */
1375 break;
1376 default:
1377 /* get rid of existing socket, and retry */
1378 xs_close(xprt);
1379 break;
1380 }
1381 }
1382 out:
1383 xprt_wake_pending_tasks(xprt, status);
1384 out_clear:
1385 xprt_clear_connecting(xprt);
1386 }
1387
1388 /**
1389 * xs_connect - connect a socket to a remote endpoint
1390 * @task: address of RPC task that manages state of connect request
1391 *
1392 * TCP: If the remote end dropped the connection, delay reconnecting.
1393 *
1394 * UDP socket connects are synchronous, but we use a work queue anyway
1395 * to guarantee that even unprivileged user processes can set up a
1396 * socket on a privileged port.
1397 *
1398 * If a UDP socket connect fails, the delay behavior here prevents
1399 * retry floods (hard mounts).
1400 */
1401 static void xs_connect(struct rpc_task *task)
1402 {
1403 struct rpc_xprt *xprt = task->tk_xprt;
1404 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1405
1406 if (xprt_test_and_set_connecting(xprt))
1407 return;
1408
1409 if (transport->sock != NULL) {
1410 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1411 "seconds\n",
1412 xprt, xprt->reestablish_timeout / HZ);
1413 schedule_delayed_work(&transport->connect_worker,
1414 xprt->reestablish_timeout);
1415 xprt->reestablish_timeout <<= 1;
1416 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1417 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1418 } else {
1419 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1420 schedule_delayed_work(&transport->connect_worker, 0);
1421
1422 /* flush_scheduled_work can sleep... */
1423 if (!RPC_IS_ASYNC(task))
1424 flush_scheduled_work();
1425 }
1426 }
1427
1428 /**
1429 * xs_udp_print_stats - display UDP socket-specifc stats
1430 * @xprt: rpc_xprt struct containing statistics
1431 * @seq: output file
1432 *
1433 */
1434 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1435 {
1436 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1437
1438 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1439 transport->port,
1440 xprt->stat.bind_count,
1441 xprt->stat.sends,
1442 xprt->stat.recvs,
1443 xprt->stat.bad_xids,
1444 xprt->stat.req_u,
1445 xprt->stat.bklog_u);
1446 }
1447
1448 /**
1449 * xs_tcp_print_stats - display TCP socket-specifc stats
1450 * @xprt: rpc_xprt struct containing statistics
1451 * @seq: output file
1452 *
1453 */
1454 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1455 {
1456 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1457 long idle_time = 0;
1458
1459 if (xprt_connected(xprt))
1460 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1461
1462 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1463 transport->port,
1464 xprt->stat.bind_count,
1465 xprt->stat.connect_count,
1466 xprt->stat.connect_time,
1467 idle_time,
1468 xprt->stat.sends,
1469 xprt->stat.recvs,
1470 xprt->stat.bad_xids,
1471 xprt->stat.req_u,
1472 xprt->stat.bklog_u);
1473 }
1474
1475 static struct rpc_xprt_ops xs_udp_ops = {
1476 .set_buffer_size = xs_udp_set_buffer_size,
1477 .reserve_xprt = xprt_reserve_xprt_cong,
1478 .release_xprt = xprt_release_xprt_cong,
1479 .rpcbind = rpcb_getport,
1480 .set_port = xs_set_port,
1481 .connect = xs_connect,
1482 .buf_alloc = rpc_malloc,
1483 .buf_free = rpc_free,
1484 .send_request = xs_udp_send_request,
1485 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1486 .timer = xs_udp_timer,
1487 .release_request = xprt_release_rqst_cong,
1488 .close = xs_close,
1489 .destroy = xs_destroy,
1490 .print_stats = xs_udp_print_stats,
1491 };
1492
1493 static struct rpc_xprt_ops xs_tcp_ops = {
1494 .reserve_xprt = xprt_reserve_xprt,
1495 .release_xprt = xs_tcp_release_xprt,
1496 .rpcbind = rpcb_getport,
1497 .set_port = xs_set_port,
1498 .connect = xs_connect,
1499 .buf_alloc = rpc_malloc,
1500 .buf_free = rpc_free,
1501 .send_request = xs_tcp_send_request,
1502 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1503 .close = xs_close,
1504 .destroy = xs_destroy,
1505 .print_stats = xs_tcp_print_stats,
1506 };
1507
1508 static struct rpc_xprt *xs_setup_xprt(struct sockaddr *addr, size_t addrlen, unsigned int slot_table_size)
1509 {
1510 struct rpc_xprt *xprt;
1511 struct sock_xprt *new;
1512
1513 if (addrlen > sizeof(xprt->addr)) {
1514 dprintk("RPC: xs_setup_xprt: address too large\n");
1515 return ERR_PTR(-EBADF);
1516 }
1517
1518 new = kzalloc(sizeof(*new), GFP_KERNEL);
1519 if (new == NULL) {
1520 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1521 "rpc_xprt\n");
1522 return ERR_PTR(-ENOMEM);
1523 }
1524 xprt = &new->xprt;
1525
1526 xprt->max_reqs = slot_table_size;
1527 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1528 if (xprt->slot == NULL) {
1529 kfree(xprt);
1530 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1531 "table\n");
1532 return ERR_PTR(-ENOMEM);
1533 }
1534
1535 memcpy(&xprt->addr, addr, addrlen);
1536 xprt->addrlen = addrlen;
1537 new->port = xs_get_random_port();
1538
1539 return xprt;
1540 }
1541
1542 /**
1543 * xs_setup_udp - Set up transport to use a UDP socket
1544 * @addr: address of remote server
1545 * @addrlen: length of address in bytes
1546 * @to: timeout parameters
1547 *
1548 */
1549 struct rpc_xprt *xs_setup_udp(struct sockaddr *addr, size_t addrlen, struct rpc_timeout *to)
1550 {
1551 struct rpc_xprt *xprt;
1552 struct sock_xprt *transport;
1553
1554 xprt = xs_setup_xprt(addr, addrlen, xprt_udp_slot_table_entries);
1555 if (IS_ERR(xprt))
1556 return xprt;
1557 transport = container_of(xprt, struct sock_xprt, xprt);
1558
1559 if (ntohs(((struct sockaddr_in *)addr)->sin_port) != 0)
1560 xprt_set_bound(xprt);
1561
1562 xprt->prot = IPPROTO_UDP;
1563 xprt->tsh_size = 0;
1564 /* XXX: header size can vary due to auth type, IPv6, etc. */
1565 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1566
1567 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_connect_worker);
1568 xprt->bind_timeout = XS_BIND_TO;
1569 xprt->connect_timeout = XS_UDP_CONN_TO;
1570 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1571 xprt->idle_timeout = XS_IDLE_DISC_TO;
1572
1573 xprt->ops = &xs_udp_ops;
1574
1575 if (to)
1576 xprt->timeout = *to;
1577 else
1578 xprt_set_timeout(&xprt->timeout, 5, 5 * HZ);
1579
1580 xs_format_peer_addresses(xprt);
1581 dprintk("RPC: set up transport to address %s\n",
1582 xprt->address_strings[RPC_DISPLAY_ALL]);
1583
1584 return xprt;
1585 }
1586
1587 /**
1588 * xs_setup_tcp - Set up transport to use a TCP socket
1589 * @addr: address of remote server
1590 * @addrlen: length of address in bytes
1591 * @to: timeout parameters
1592 *
1593 */
1594 struct rpc_xprt *xs_setup_tcp(struct sockaddr *addr, size_t addrlen, struct rpc_timeout *to)
1595 {
1596 struct rpc_xprt *xprt;
1597 struct sock_xprt *transport;
1598
1599 xprt = xs_setup_xprt(addr, addrlen, xprt_tcp_slot_table_entries);
1600 if (IS_ERR(xprt))
1601 return xprt;
1602 transport = container_of(xprt, struct sock_xprt, xprt);
1603
1604 if (ntohs(((struct sockaddr_in *)addr)->sin_port) != 0)
1605 xprt_set_bound(xprt);
1606
1607 xprt->prot = IPPROTO_TCP;
1608 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
1609 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
1610
1611 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker);
1612 xprt->bind_timeout = XS_BIND_TO;
1613 xprt->connect_timeout = XS_TCP_CONN_TO;
1614 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1615 xprt->idle_timeout = XS_IDLE_DISC_TO;
1616
1617 xprt->ops = &xs_tcp_ops;
1618
1619 if (to)
1620 xprt->timeout = *to;
1621 else
1622 xprt_set_timeout(&xprt->timeout, 2, 60 * HZ);
1623
1624 xs_format_peer_addresses(xprt);
1625 dprintk("RPC: set up transport to address %s\n",
1626 xprt->address_strings[RPC_DISPLAY_ALL]);
1627
1628 return xprt;
1629 }
1630
1631 /**
1632 * init_socket_xprt - set up xprtsock's sysctls
1633 *
1634 */
1635 int init_socket_xprt(void)
1636 {
1637 #ifdef RPC_DEBUG
1638 if (!sunrpc_table_header)
1639 sunrpc_table_header = register_sysctl_table(sunrpc_table);
1640 #endif
1641
1642 return 0;
1643 }
1644
1645 /**
1646 * cleanup_socket_xprt - remove xprtsock's sysctls
1647 *
1648 */
1649 void cleanup_socket_xprt(void)
1650 {
1651 #ifdef RPC_DEBUG
1652 if (sunrpc_table_header) {
1653 unregister_sysctl_table(sunrpc_table_header);
1654 sunrpc_table_header = NULL;
1655 }
1656 #endif
1657 }
Support for the Chinese Samsung S3C2440 based development boards