Commit | Line | Data |
---|---|---|
a246b010 CL |
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> | |
55aa4f58 CL |
14 | * |
15 | * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com> | |
8f9d5b1a CL |
16 | * |
17 | * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005. | |
18 | * <gilles.quillard@bull.net> | |
a246b010 CL |
19 | */ |
20 | ||
21 | #include <linux/types.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/capability.h> | |
a246b010 CL |
24 | #include <linux/pagemap.h> |
25 | #include <linux/errno.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/in.h> | |
28 | #include <linux/net.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/udp.h> | |
31 | #include <linux/tcp.h> | |
32 | #include <linux/sunrpc/clnt.h> | |
02107148 | 33 | #include <linux/sunrpc/sched.h> |
a246b010 CL |
34 | #include <linux/file.h> |
35 | ||
36 | #include <net/sock.h> | |
37 | #include <net/checksum.h> | |
38 | #include <net/udp.h> | |
39 | #include <net/tcp.h> | |
40 | ||
c556b754 CL |
41 | /* |
42 | * xprtsock tunables | |
43 | */ | |
44 | unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
45 | unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE; | |
46 | ||
47 | unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT; | |
48 | unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT; | |
49 | ||
fbf76683 CL |
50 | /* |
51 | * We can register our own files under /proc/sys/sunrpc by | |
52 | * calling register_sysctl_table() again. The files in that | |
53 | * directory become the union of all files registered there. | |
54 | * | |
55 | * We simply need to make sure that we don't collide with | |
56 | * someone else's file names! | |
57 | */ | |
58 | ||
59 | #ifdef RPC_DEBUG | |
60 | ||
61 | static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE; | |
62 | static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE; | |
63 | static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT; | |
64 | static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT; | |
65 | ||
66 | static struct ctl_table_header *sunrpc_table_header; | |
67 | ||
68 | /* | |
69 | * FIXME: changing the UDP slot table size should also resize the UDP | |
70 | * socket buffers for existing UDP transports | |
71 | */ | |
72 | static ctl_table xs_tunables_table[] = { | |
73 | { | |
74 | .ctl_name = CTL_SLOTTABLE_UDP, | |
75 | .procname = "udp_slot_table_entries", | |
76 | .data = &xprt_udp_slot_table_entries, | |
77 | .maxlen = sizeof(unsigned int), | |
78 | .mode = 0644, | |
79 | .proc_handler = &proc_dointvec_minmax, | |
80 | .strategy = &sysctl_intvec, | |
81 | .extra1 = &min_slot_table_size, | |
82 | .extra2 = &max_slot_table_size | |
83 | }, | |
84 | { | |
85 | .ctl_name = CTL_SLOTTABLE_TCP, | |
86 | .procname = "tcp_slot_table_entries", | |
87 | .data = &xprt_tcp_slot_table_entries, | |
88 | .maxlen = sizeof(unsigned int), | |
89 | .mode = 0644, | |
90 | .proc_handler = &proc_dointvec_minmax, | |
91 | .strategy = &sysctl_intvec, | |
92 | .extra1 = &min_slot_table_size, | |
93 | .extra2 = &max_slot_table_size | |
94 | }, | |
95 | { | |
96 | .ctl_name = CTL_MIN_RESVPORT, | |
97 | .procname = "min_resvport", | |
98 | .data = &xprt_min_resvport, | |
99 | .maxlen = sizeof(unsigned int), | |
100 | .mode = 0644, | |
101 | .proc_handler = &proc_dointvec_minmax, | |
102 | .strategy = &sysctl_intvec, | |
103 | .extra1 = &xprt_min_resvport_limit, | |
104 | .extra2 = &xprt_max_resvport_limit | |
105 | }, | |
106 | { | |
107 | .ctl_name = CTL_MAX_RESVPORT, | |
108 | .procname = "max_resvport", | |
109 | .data = &xprt_max_resvport, | |
110 | .maxlen = sizeof(unsigned int), | |
111 | .mode = 0644, | |
112 | .proc_handler = &proc_dointvec_minmax, | |
113 | .strategy = &sysctl_intvec, | |
114 | .extra1 = &xprt_min_resvport_limit, | |
115 | .extra2 = &xprt_max_resvport_limit | |
116 | }, | |
117 | { | |
118 | .ctl_name = 0, | |
119 | }, | |
120 | }; | |
121 | ||
122 | static ctl_table sunrpc_table[] = { | |
123 | { | |
124 | .ctl_name = CTL_SUNRPC, | |
125 | .procname = "sunrpc", | |
126 | .mode = 0555, | |
127 | .child = xs_tunables_table | |
128 | }, | |
129 | { | |
130 | .ctl_name = 0, | |
131 | }, | |
132 | }; | |
133 | ||
134 | #endif | |
135 | ||
262965f5 CL |
136 | /* |
137 | * How many times to try sending a request on a socket before waiting | |
138 | * for the socket buffer to clear. | |
139 | */ | |
140 | #define XS_SENDMSG_RETRY (10U) | |
141 | ||
03bf4b70 CL |
142 | /* |
143 | * Time out for an RPC UDP socket connect. UDP socket connects are | |
144 | * synchronous, but we set a timeout anyway in case of resource | |
145 | * exhaustion on the local host. | |
146 | */ | |
147 | #define XS_UDP_CONN_TO (5U * HZ) | |
148 | ||
149 | /* | |
150 | * Wait duration for an RPC TCP connection to be established. Solaris | |
151 | * NFS over TCP uses 60 seconds, for example, which is in line with how | |
152 | * long a server takes to reboot. | |
153 | */ | |
154 | #define XS_TCP_CONN_TO (60U * HZ) | |
155 | ||
156 | /* | |
157 | * Wait duration for a reply from the RPC portmapper. | |
158 | */ | |
159 | #define XS_BIND_TO (60U * HZ) | |
160 | ||
161 | /* | |
162 | * Delay if a UDP socket connect error occurs. This is most likely some | |
163 | * kind of resource problem on the local host. | |
164 | */ | |
165 | #define XS_UDP_REEST_TO (2U * HZ) | |
166 | ||
167 | /* | |
168 | * The reestablish timeout allows clients to delay for a bit before attempting | |
169 | * to reconnect to a server that just dropped our connection. | |
170 | * | |
171 | * We implement an exponential backoff when trying to reestablish a TCP | |
172 | * transport connection with the server. Some servers like to drop a TCP | |
173 | * connection when they are overworked, so we start with a short timeout and | |
174 | * increase over time if the server is down or not responding. | |
175 | */ | |
176 | #define XS_TCP_INIT_REEST_TO (3U * HZ) | |
177 | #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ) | |
178 | ||
179 | /* | |
180 | * TCP idle timeout; client drops the transport socket if it is idle | |
181 | * for this long. Note that we also timeout UDP sockets to prevent | |
182 | * holding port numbers when there is no RPC traffic. | |
183 | */ | |
184 | #define XS_IDLE_DISC_TO (5U * 60 * HZ) | |
185 | ||
a246b010 CL |
186 | #ifdef RPC_DEBUG |
187 | # undef RPC_DEBUG_DATA | |
9903cd1c | 188 | # define RPCDBG_FACILITY RPCDBG_TRANS |
a246b010 CL |
189 | #endif |
190 | ||
a246b010 | 191 | #ifdef RPC_DEBUG_DATA |
9903cd1c | 192 | static void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 | 193 | { |
9903cd1c CL |
194 | u8 *buf = (u8 *) packet; |
195 | int j; | |
a246b010 | 196 | |
46121cf7 | 197 | dprintk("RPC: %s\n", msg); |
a246b010 CL |
198 | for (j = 0; j < count && j < 128; j += 4) { |
199 | if (!(j & 31)) { | |
200 | if (j) | |
201 | dprintk("\n"); | |
202 | dprintk("0x%04x ", j); | |
203 | } | |
204 | dprintk("%02x%02x%02x%02x ", | |
205 | buf[j], buf[j+1], buf[j+2], buf[j+3]); | |
206 | } | |
207 | dprintk("\n"); | |
208 | } | |
209 | #else | |
9903cd1c | 210 | static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count) |
a246b010 CL |
211 | { |
212 | /* NOP */ | |
213 | } | |
214 | #endif | |
215 | ||
ffc2e518 CL |
216 | struct sock_xprt { |
217 | struct rpc_xprt xprt; | |
ee0ac0c2 CL |
218 | |
219 | /* | |
220 | * Network layer | |
221 | */ | |
222 | struct socket * sock; | |
223 | struct sock * inet; | |
51971139 CL |
224 | |
225 | /* | |
226 | * State of TCP reply receive | |
227 | */ | |
228 | __be32 tcp_fraghdr, | |
229 | tcp_xid; | |
230 | ||
231 | u32 tcp_offset, | |
232 | tcp_reclen; | |
233 | ||
234 | unsigned long tcp_copied, | |
235 | tcp_flags; | |
c8475461 CL |
236 | |
237 | /* | |
238 | * Connection of transports | |
239 | */ | |
34161db6 | 240 | struct delayed_work connect_worker; |
d3bc9a1d | 241 | struct sockaddr_storage addr; |
c8475461 | 242 | unsigned short port; |
7c6e066e CL |
243 | |
244 | /* | |
245 | * UDP socket buffer size parameters | |
246 | */ | |
247 | size_t rcvsize, | |
248 | sndsize; | |
314dfd79 CL |
249 | |
250 | /* | |
251 | * Saved socket callback addresses | |
252 | */ | |
253 | void (*old_data_ready)(struct sock *, int); | |
254 | void (*old_state_change)(struct sock *); | |
255 | void (*old_write_space)(struct sock *); | |
ffc2e518 CL |
256 | }; |
257 | ||
e136d092 CL |
258 | /* |
259 | * TCP receive state flags | |
260 | */ | |
261 | #define TCP_RCV_LAST_FRAG (1UL << 0) | |
262 | #define TCP_RCV_COPY_FRAGHDR (1UL << 1) | |
263 | #define TCP_RCV_COPY_XID (1UL << 2) | |
264 | #define TCP_RCV_COPY_DATA (1UL << 3) | |
265 | ||
95392c59 CL |
266 | static inline struct sockaddr *xs_addr(struct rpc_xprt *xprt) |
267 | { | |
268 | return (struct sockaddr *) &xprt->addr; | |
269 | } | |
270 | ||
271 | static inline struct sockaddr_in *xs_addr_in(struct rpc_xprt *xprt) | |
272 | { | |
273 | return (struct sockaddr_in *) &xprt->addr; | |
274 | } | |
275 | ||
276 | static inline struct sockaddr_in6 *xs_addr_in6(struct rpc_xprt *xprt) | |
277 | { | |
278 | return (struct sockaddr_in6 *) &xprt->addr; | |
279 | } | |
280 | ||
ba10f2c2 | 281 | static void xs_format_ipv4_peer_addresses(struct rpc_xprt *xprt) |
edb267a6 | 282 | { |
95392c59 | 283 | struct sockaddr_in *addr = xs_addr_in(xprt); |
edb267a6 CL |
284 | char *buf; |
285 | ||
286 | buf = kzalloc(20, GFP_KERNEL); | |
287 | if (buf) { | |
bda243df | 288 | snprintf(buf, 20, NIPQUAD_FMT, |
edb267a6 CL |
289 | NIPQUAD(addr->sin_addr.s_addr)); |
290 | } | |
291 | xprt->address_strings[RPC_DISPLAY_ADDR] = buf; | |
292 | ||
293 | buf = kzalloc(8, GFP_KERNEL); | |
294 | if (buf) { | |
295 | snprintf(buf, 8, "%u", | |
296 | ntohs(addr->sin_port)); | |
297 | } | |
298 | xprt->address_strings[RPC_DISPLAY_PORT] = buf; | |
299 | ||
0c43b3d8 CL |
300 | buf = kzalloc(8, GFP_KERNEL); |
301 | if (buf) { | |
302 | if (xprt->prot == IPPROTO_UDP) | |
303 | snprintf(buf, 8, "udp"); | |
304 | else | |
305 | snprintf(buf, 8, "tcp"); | |
306 | } | |
307 | xprt->address_strings[RPC_DISPLAY_PROTO] = buf; | |
edb267a6 CL |
308 | |
309 | buf = kzalloc(48, GFP_KERNEL); | |
310 | if (buf) { | |
bda243df | 311 | snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s", |
edb267a6 CL |
312 | NIPQUAD(addr->sin_addr.s_addr), |
313 | ntohs(addr->sin_port), | |
314 | xprt->prot == IPPROTO_UDP ? "udp" : "tcp"); | |
315 | } | |
316 | xprt->address_strings[RPC_DISPLAY_ALL] = buf; | |
fbfe3cc6 CL |
317 | |
318 | buf = kzalloc(10, GFP_KERNEL); | |
319 | if (buf) { | |
320 | snprintf(buf, 10, "%02x%02x%02x%02x", | |
321 | NIPQUAD(addr->sin_addr.s_addr)); | |
322 | } | |
323 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; | |
324 | ||
325 | buf = kzalloc(8, GFP_KERNEL); | |
326 | if (buf) { | |
327 | snprintf(buf, 8, "%4hx", | |
328 | ntohs(addr->sin_port)); | |
329 | } | |
330 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; | |
edb267a6 CL |
331 | } |
332 | ||
4b6473fb CL |
333 | static void xs_format_ipv6_peer_addresses(struct rpc_xprt *xprt) |
334 | { | |
95392c59 | 335 | struct sockaddr_in6 *addr = xs_addr_in6(xprt); |
4b6473fb CL |
336 | char *buf; |
337 | ||
338 | buf = kzalloc(40, GFP_KERNEL); | |
339 | if (buf) { | |
340 | snprintf(buf, 40, NIP6_FMT, | |
341 | NIP6(addr->sin6_addr)); | |
342 | } | |
343 | xprt->address_strings[RPC_DISPLAY_ADDR] = buf; | |
344 | ||
345 | buf = kzalloc(8, GFP_KERNEL); | |
346 | if (buf) { | |
347 | snprintf(buf, 8, "%u", | |
348 | ntohs(addr->sin6_port)); | |
349 | } | |
350 | xprt->address_strings[RPC_DISPLAY_PORT] = buf; | |
351 | ||
352 | buf = kzalloc(8, GFP_KERNEL); | |
353 | if (buf) { | |
354 | if (xprt->prot == IPPROTO_UDP) | |
355 | snprintf(buf, 8, "udp"); | |
356 | else | |
357 | snprintf(buf, 8, "tcp"); | |
358 | } | |
359 | xprt->address_strings[RPC_DISPLAY_PROTO] = buf; | |
360 | ||
361 | buf = kzalloc(64, GFP_KERNEL); | |
362 | if (buf) { | |
363 | snprintf(buf, 64, "addr="NIP6_FMT" port=%u proto=%s", | |
364 | NIP6(addr->sin6_addr), | |
365 | ntohs(addr->sin6_port), | |
366 | xprt->prot == IPPROTO_UDP ? "udp" : "tcp"); | |
367 | } | |
368 | xprt->address_strings[RPC_DISPLAY_ALL] = buf; | |
369 | ||
370 | buf = kzalloc(36, GFP_KERNEL); | |
371 | if (buf) { | |
372 | snprintf(buf, 36, NIP6_SEQFMT, | |
373 | NIP6(addr->sin6_addr)); | |
374 | } | |
375 | xprt->address_strings[RPC_DISPLAY_HEX_ADDR] = buf; | |
376 | ||
377 | buf = kzalloc(8, GFP_KERNEL); | |
378 | if (buf) { | |
379 | snprintf(buf, 8, "%4hx", | |
380 | ntohs(addr->sin6_port)); | |
381 | } | |
382 | xprt->address_strings[RPC_DISPLAY_HEX_PORT] = buf; | |
383 | } | |
384 | ||
edb267a6 CL |
385 | static void xs_free_peer_addresses(struct rpc_xprt *xprt) |
386 | { | |
0c43b3d8 CL |
387 | int i; |
388 | ||
389 | for (i = 0; i < RPC_DISPLAY_MAX; i++) | |
390 | kfree(xprt->address_strings[i]); | |
edb267a6 CL |
391 | } |
392 | ||
b4b5cc85 CL |
393 | #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL) |
394 | ||
24c5684b | 395 | static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more) |
b4b5cc85 | 396 | { |
b4b5cc85 CL |
397 | struct msghdr msg = { |
398 | .msg_name = addr, | |
399 | .msg_namelen = addrlen, | |
24c5684b TM |
400 | .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0), |
401 | }; | |
402 | struct kvec iov = { | |
403 | .iov_base = vec->iov_base + base, | |
404 | .iov_len = vec->iov_len - base, | |
b4b5cc85 CL |
405 | }; |
406 | ||
24c5684b | 407 | if (iov.iov_len != 0) |
b4b5cc85 CL |
408 | return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len); |
409 | return kernel_sendmsg(sock, &msg, NULL, 0, 0); | |
410 | } | |
411 | ||
24c5684b | 412 | static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more) |
b4b5cc85 | 413 | { |
24c5684b TM |
414 | struct page **ppage; |
415 | unsigned int remainder; | |
416 | int err, sent = 0; | |
417 | ||
418 | remainder = xdr->page_len - base; | |
419 | base += xdr->page_base; | |
420 | ppage = xdr->pages + (base >> PAGE_SHIFT); | |
421 | base &= ~PAGE_MASK; | |
422 | for(;;) { | |
423 | unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder); | |
424 | int flags = XS_SENDMSG_FLAGS; | |
b4b5cc85 | 425 | |
24c5684b TM |
426 | remainder -= len; |
427 | if (remainder != 0 || more) | |
428 | flags |= MSG_MORE; | |
429 | err = sock->ops->sendpage(sock, *ppage, base, len, flags); | |
430 | if (remainder == 0 || err != len) | |
431 | break; | |
432 | sent += err; | |
433 | ppage++; | |
434 | base = 0; | |
435 | } | |
436 | if (sent == 0) | |
437 | return err; | |
438 | if (err > 0) | |
439 | sent += err; | |
440 | return sent; | |
b4b5cc85 CL |
441 | } |
442 | ||
9903cd1c CL |
443 | /** |
444 | * xs_sendpages - write pages directly to a socket | |
445 | * @sock: socket to send on | |
446 | * @addr: UDP only -- address of destination | |
447 | * @addrlen: UDP only -- length of destination address | |
448 | * @xdr: buffer containing this request | |
449 | * @base: starting position in the buffer | |
450 | * | |
a246b010 | 451 | */ |
24c5684b | 452 | static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base) |
a246b010 | 453 | { |
24c5684b TM |
454 | unsigned int remainder = xdr->len - base; |
455 | int err, sent = 0; | |
a246b010 | 456 | |
262965f5 CL |
457 | if (unlikely(!sock)) |
458 | return -ENOTCONN; | |
459 | ||
460 | clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags); | |
24c5684b TM |
461 | if (base != 0) { |
462 | addr = NULL; | |
463 | addrlen = 0; | |
464 | } | |
262965f5 | 465 | |
24c5684b TM |
466 | if (base < xdr->head[0].iov_len || addr != NULL) { |
467 | unsigned int len = xdr->head[0].iov_len - base; | |
468 | remainder -= len; | |
469 | err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0); | |
470 | if (remainder == 0 || err != len) | |
a246b010 | 471 | goto out; |
24c5684b | 472 | sent += err; |
a246b010 CL |
473 | base = 0; |
474 | } else | |
24c5684b | 475 | base -= xdr->head[0].iov_len; |
a246b010 | 476 | |
24c5684b TM |
477 | if (base < xdr->page_len) { |
478 | unsigned int len = xdr->page_len - base; | |
479 | remainder -= len; | |
480 | err = xs_send_pagedata(sock, xdr, base, remainder != 0); | |
481 | if (remainder == 0 || err != len) | |
a246b010 | 482 | goto out; |
24c5684b | 483 | sent += err; |
a246b010 | 484 | base = 0; |
24c5684b TM |
485 | } else |
486 | base -= xdr->page_len; | |
487 | ||
488 | if (base >= xdr->tail[0].iov_len) | |
489 | return sent; | |
490 | err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0); | |
a246b010 | 491 | out: |
24c5684b TM |
492 | if (sent == 0) |
493 | return err; | |
494 | if (err > 0) | |
495 | sent += err; | |
496 | return sent; | |
a246b010 CL |
497 | } |
498 | ||
9903cd1c | 499 | /** |
262965f5 CL |
500 | * xs_nospace - place task on wait queue if transmit was incomplete |
501 | * @task: task to put to sleep | |
9903cd1c | 502 | * |
a246b010 | 503 | */ |
262965f5 | 504 | static void xs_nospace(struct rpc_task *task) |
a246b010 | 505 | { |
262965f5 CL |
506 | struct rpc_rqst *req = task->tk_rqstp; |
507 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 508 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 509 | |
46121cf7 | 510 | dprintk("RPC: %5u xmit incomplete (%u left of %u)\n", |
262965f5 CL |
511 | task->tk_pid, req->rq_slen - req->rq_bytes_sent, |
512 | req->rq_slen); | |
513 | ||
ee0ac0c2 | 514 | if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { |
262965f5 CL |
515 | /* Protect against races with write_space */ |
516 | spin_lock_bh(&xprt->transport_lock); | |
517 | ||
518 | /* Don't race with disconnect */ | |
519 | if (!xprt_connected(xprt)) | |
520 | task->tk_status = -ENOTCONN; | |
ee0ac0c2 | 521 | else if (test_bit(SOCK_NOSPACE, &transport->sock->flags)) |
262965f5 CL |
522 | xprt_wait_for_buffer_space(task); |
523 | ||
524 | spin_unlock_bh(&xprt->transport_lock); | |
525 | } else | |
526 | /* Keep holding the socket if it is blocked */ | |
527 | rpc_delay(task, HZ>>4); | |
528 | } | |
529 | ||
530 | /** | |
531 | * xs_udp_send_request - write an RPC request to a UDP socket | |
532 | * @task: address of RPC task that manages the state of an RPC request | |
533 | * | |
534 | * Return values: | |
535 | * 0: The request has been sent | |
536 | * EAGAIN: The socket was blocked, please call again later to | |
537 | * complete the request | |
538 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
539 | * other: Some other error occured, the request was not sent | |
540 | */ | |
541 | static int xs_udp_send_request(struct rpc_task *task) | |
542 | { | |
543 | struct rpc_rqst *req = task->tk_rqstp; | |
544 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 545 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 CL |
546 | struct xdr_buf *xdr = &req->rq_snd_buf; |
547 | int status; | |
a246b010 | 548 | |
9903cd1c | 549 | xs_pktdump("packet data:", |
a246b010 CL |
550 | req->rq_svec->iov_base, |
551 | req->rq_svec->iov_len); | |
552 | ||
262965f5 | 553 | req->rq_xtime = jiffies; |
ee0ac0c2 | 554 | status = xs_sendpages(transport->sock, |
95392c59 | 555 | xs_addr(xprt), |
ee0ac0c2 CL |
556 | xprt->addrlen, xdr, |
557 | req->rq_bytes_sent); | |
a246b010 | 558 | |
46121cf7 | 559 | dprintk("RPC: xs_udp_send_request(%u) = %d\n", |
262965f5 | 560 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 561 | |
262965f5 CL |
562 | if (likely(status >= (int) req->rq_slen)) |
563 | return 0; | |
a246b010 | 564 | |
262965f5 CL |
565 | /* Still some bytes left; set up for a retry later. */ |
566 | if (status > 0) | |
567 | status = -EAGAIN; | |
a246b010 | 568 | |
262965f5 CL |
569 | switch (status) { |
570 | case -ENETUNREACH: | |
571 | case -EPIPE: | |
a246b010 CL |
572 | case -ECONNREFUSED: |
573 | /* When the server has died, an ICMP port unreachable message | |
9903cd1c | 574 | * prompts ECONNREFUSED. */ |
a246b010 | 575 | break; |
262965f5 CL |
576 | case -EAGAIN: |
577 | xs_nospace(task); | |
a246b010 CL |
578 | break; |
579 | default: | |
46121cf7 | 580 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
262965f5 | 581 | -status); |
9903cd1c | 582 | break; |
a246b010 | 583 | } |
262965f5 CL |
584 | |
585 | return status; | |
a246b010 CL |
586 | } |
587 | ||
808012fb CL |
588 | static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf) |
589 | { | |
590 | u32 reclen = buf->len - sizeof(rpc_fraghdr); | |
591 | rpc_fraghdr *base = buf->head[0].iov_base; | |
592 | *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen); | |
593 | } | |
594 | ||
9903cd1c | 595 | /** |
262965f5 | 596 | * xs_tcp_send_request - write an RPC request to a TCP socket |
9903cd1c CL |
597 | * @task: address of RPC task that manages the state of an RPC request |
598 | * | |
599 | * Return values: | |
262965f5 CL |
600 | * 0: The request has been sent |
601 | * EAGAIN: The socket was blocked, please call again later to | |
602 | * complete the request | |
603 | * ENOTCONN: Caller needs to invoke connect logic then call again | |
604 | * other: Some other error occured, the request was not sent | |
9903cd1c CL |
605 | * |
606 | * XXX: In the case of soft timeouts, should we eventually give up | |
262965f5 | 607 | * if sendmsg is not able to make progress? |
9903cd1c | 608 | */ |
262965f5 | 609 | static int xs_tcp_send_request(struct rpc_task *task) |
a246b010 CL |
610 | { |
611 | struct rpc_rqst *req = task->tk_rqstp; | |
612 | struct rpc_xprt *xprt = req->rq_xprt; | |
ee0ac0c2 | 613 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262965f5 | 614 | struct xdr_buf *xdr = &req->rq_snd_buf; |
b595bb15 CL |
615 | int status; |
616 | unsigned int retry = 0; | |
a246b010 | 617 | |
808012fb | 618 | xs_encode_tcp_record_marker(&req->rq_snd_buf); |
a246b010 | 619 | |
262965f5 CL |
620 | xs_pktdump("packet data:", |
621 | req->rq_svec->iov_base, | |
622 | req->rq_svec->iov_len); | |
a246b010 CL |
623 | |
624 | /* Continue transmitting the packet/record. We must be careful | |
625 | * to cope with writespace callbacks arriving _after_ we have | |
262965f5 | 626 | * called sendmsg(). */ |
a246b010 CL |
627 | while (1) { |
628 | req->rq_xtime = jiffies; | |
ee0ac0c2 CL |
629 | status = xs_sendpages(transport->sock, |
630 | NULL, 0, xdr, req->rq_bytes_sent); | |
a246b010 | 631 | |
46121cf7 | 632 | dprintk("RPC: xs_tcp_send_request(%u) = %d\n", |
262965f5 | 633 | xdr->len - req->rq_bytes_sent, status); |
a246b010 | 634 | |
262965f5 | 635 | if (unlikely(status < 0)) |
a246b010 | 636 | break; |
a246b010 | 637 | |
262965f5 CL |
638 | /* If we've sent the entire packet, immediately |
639 | * reset the count of bytes sent. */ | |
640 | req->rq_bytes_sent += status; | |
ef759a2e | 641 | task->tk_bytes_sent += status; |
262965f5 CL |
642 | if (likely(req->rq_bytes_sent >= req->rq_slen)) { |
643 | req->rq_bytes_sent = 0; | |
644 | return 0; | |
645 | } | |
a246b010 CL |
646 | |
647 | status = -EAGAIN; | |
262965f5 | 648 | if (retry++ > XS_SENDMSG_RETRY) |
a246b010 CL |
649 | break; |
650 | } | |
651 | ||
262965f5 CL |
652 | switch (status) { |
653 | case -EAGAIN: | |
654 | xs_nospace(task); | |
655 | break; | |
656 | case -ECONNREFUSED: | |
657 | case -ECONNRESET: | |
658 | case -ENOTCONN: | |
659 | case -EPIPE: | |
660 | status = -ENOTCONN; | |
661 | break; | |
662 | default: | |
46121cf7 | 663 | dprintk("RPC: sendmsg returned unrecognized error %d\n", |
262965f5 | 664 | -status); |
43118c29 | 665 | xprt_disconnect(xprt); |
262965f5 | 666 | break; |
a246b010 | 667 | } |
262965f5 | 668 | |
a246b010 CL |
669 | return status; |
670 | } | |
671 | ||
e0ab53de TM |
672 | /** |
673 | * xs_tcp_release_xprt - clean up after a tcp transmission | |
674 | * @xprt: transport | |
675 | * @task: rpc task | |
676 | * | |
677 | * This cleans up if an error causes us to abort the transmission of a request. | |
678 | * In this case, the socket may need to be reset in order to avoid confusing | |
679 | * the server. | |
680 | */ | |
681 | static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task) | |
682 | { | |
683 | struct rpc_rqst *req; | |
684 | ||
685 | if (task != xprt->snd_task) | |
686 | return; | |
687 | if (task == NULL) | |
688 | goto out_release; | |
689 | req = task->tk_rqstp; | |
690 | if (req->rq_bytes_sent == 0) | |
691 | goto out_release; | |
692 | if (req->rq_bytes_sent == req->rq_snd_buf.len) | |
693 | goto out_release; | |
694 | set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state); | |
695 | out_release: | |
696 | xprt_release_xprt(xprt, task); | |
697 | } | |
698 | ||
9903cd1c CL |
699 | /** |
700 | * xs_close - close a socket | |
701 | * @xprt: transport | |
702 | * | |
3167e12c CL |
703 | * This is used when all requests are complete; ie, no DRC state remains |
704 | * on the server we want to save. | |
a246b010 | 705 | */ |
9903cd1c | 706 | static void xs_close(struct rpc_xprt *xprt) |
a246b010 | 707 | { |
ee0ac0c2 CL |
708 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
709 | struct socket *sock = transport->sock; | |
710 | struct sock *sk = transport->inet; | |
a246b010 CL |
711 | |
712 | if (!sk) | |
632e3bdc | 713 | goto clear_close_wait; |
a246b010 | 714 | |
46121cf7 | 715 | dprintk("RPC: xs_close xprt %p\n", xprt); |
9903cd1c | 716 | |
a246b010 | 717 | write_lock_bh(&sk->sk_callback_lock); |
ee0ac0c2 CL |
718 | transport->inet = NULL; |
719 | transport->sock = NULL; | |
a246b010 | 720 | |
9903cd1c | 721 | sk->sk_user_data = NULL; |
314dfd79 CL |
722 | sk->sk_data_ready = transport->old_data_ready; |
723 | sk->sk_state_change = transport->old_state_change; | |
724 | sk->sk_write_space = transport->old_write_space; | |
a246b010 CL |
725 | write_unlock_bh(&sk->sk_callback_lock); |
726 | ||
9903cd1c | 727 | sk->sk_no_check = 0; |
a246b010 CL |
728 | |
729 | sock_release(sock); | |
632e3bdc TM |
730 | clear_close_wait: |
731 | smp_mb__before_clear_bit(); | |
732 | clear_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
733 | smp_mb__after_clear_bit(); | |
a246b010 CL |
734 | } |
735 | ||
9903cd1c CL |
736 | /** |
737 | * xs_destroy - prepare to shutdown a transport | |
738 | * @xprt: doomed transport | |
739 | * | |
740 | */ | |
741 | static void xs_destroy(struct rpc_xprt *xprt) | |
a246b010 | 742 | { |
c8475461 CL |
743 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
744 | ||
46121cf7 | 745 | dprintk("RPC: xs_destroy xprt %p\n", xprt); |
9903cd1c | 746 | |
c1384c9c | 747 | cancel_rearming_delayed_work(&transport->connect_worker); |
a246b010 CL |
748 | |
749 | xprt_disconnect(xprt); | |
9903cd1c | 750 | xs_close(xprt); |
edb267a6 | 751 | xs_free_peer_addresses(xprt); |
a246b010 | 752 | kfree(xprt->slot); |
c8541ecd | 753 | kfree(xprt); |
a246b010 CL |
754 | } |
755 | ||
9903cd1c CL |
756 | static inline struct rpc_xprt *xprt_from_sock(struct sock *sk) |
757 | { | |
758 | return (struct rpc_xprt *) sk->sk_user_data; | |
759 | } | |
760 | ||
761 | /** | |
762 | * xs_udp_data_ready - "data ready" callback for UDP sockets | |
763 | * @sk: socket with data to read | |
764 | * @len: how much data to read | |
765 | * | |
a246b010 | 766 | */ |
9903cd1c | 767 | static void xs_udp_data_ready(struct sock *sk, int len) |
a246b010 | 768 | { |
9903cd1c CL |
769 | struct rpc_task *task; |
770 | struct rpc_xprt *xprt; | |
a246b010 | 771 | struct rpc_rqst *rovr; |
9903cd1c | 772 | struct sk_buff *skb; |
a246b010 | 773 | int err, repsize, copied; |
d8ed029d AD |
774 | u32 _xid; |
775 | __be32 *xp; | |
a246b010 CL |
776 | |
777 | read_lock(&sk->sk_callback_lock); | |
46121cf7 | 778 | dprintk("RPC: xs_udp_data_ready...\n"); |
9903cd1c | 779 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 780 | goto out; |
a246b010 CL |
781 | |
782 | if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) | |
783 | goto out; | |
784 | ||
785 | if (xprt->shutdown) | |
786 | goto dropit; | |
787 | ||
788 | repsize = skb->len - sizeof(struct udphdr); | |
789 | if (repsize < 4) { | |
46121cf7 | 790 | dprintk("RPC: impossible RPC reply size %d!\n", repsize); |
a246b010 CL |
791 | goto dropit; |
792 | } | |
793 | ||
794 | /* Copy the XID from the skb... */ | |
795 | xp = skb_header_pointer(skb, sizeof(struct udphdr), | |
796 | sizeof(_xid), &_xid); | |
797 | if (xp == NULL) | |
798 | goto dropit; | |
799 | ||
800 | /* Look up and lock the request corresponding to the given XID */ | |
4a0f8c04 | 801 | spin_lock(&xprt->transport_lock); |
a246b010 CL |
802 | rovr = xprt_lookup_rqst(xprt, *xp); |
803 | if (!rovr) | |
804 | goto out_unlock; | |
805 | task = rovr->rq_task; | |
806 | ||
a246b010 CL |
807 | if ((copied = rovr->rq_private_buf.buflen) > repsize) |
808 | copied = repsize; | |
809 | ||
810 | /* Suck it into the iovec, verify checksum if not done by hw. */ | |
811 | if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb)) | |
812 | goto out_unlock; | |
813 | ||
814 | /* Something worked... */ | |
815 | dst_confirm(skb->dst); | |
816 | ||
1570c1e4 CL |
817 | xprt_adjust_cwnd(task, copied); |
818 | xprt_update_rtt(task); | |
819 | xprt_complete_rqst(task, copied); | |
a246b010 CL |
820 | |
821 | out_unlock: | |
4a0f8c04 | 822 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
823 | dropit: |
824 | skb_free_datagram(sk, skb); | |
825 | out: | |
826 | read_unlock(&sk->sk_callback_lock); | |
827 | } | |
828 | ||
dd456471 | 829 | static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 830 | { |
51971139 | 831 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
832 | size_t len, used; |
833 | char *p; | |
834 | ||
51971139 CL |
835 | p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset; |
836 | len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset; | |
9d292316 | 837 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 838 | transport->tcp_offset += used; |
a246b010 CL |
839 | if (used != len) |
840 | return; | |
808012fb | 841 | |
51971139 CL |
842 | transport->tcp_reclen = ntohl(transport->tcp_fraghdr); |
843 | if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT) | |
e136d092 | 844 | transport->tcp_flags |= TCP_RCV_LAST_FRAG; |
a246b010 | 845 | else |
e136d092 | 846 | transport->tcp_flags &= ~TCP_RCV_LAST_FRAG; |
51971139 | 847 | transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK; |
808012fb | 848 | |
e136d092 | 849 | transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR; |
51971139 | 850 | transport->tcp_offset = 0; |
808012fb | 851 | |
a246b010 | 852 | /* Sanity check of the record length */ |
51971139 | 853 | if (unlikely(transport->tcp_reclen < 4)) { |
46121cf7 | 854 | dprintk("RPC: invalid TCP record fragment length\n"); |
a246b010 | 855 | xprt_disconnect(xprt); |
9903cd1c | 856 | return; |
a246b010 | 857 | } |
46121cf7 | 858 | dprintk("RPC: reading TCP record fragment of length %d\n", |
51971139 | 859 | transport->tcp_reclen); |
a246b010 CL |
860 | } |
861 | ||
51971139 | 862 | static void xs_tcp_check_fraghdr(struct sock_xprt *transport) |
a246b010 | 863 | { |
51971139 | 864 | if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 | 865 | transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR; |
51971139 | 866 | transport->tcp_offset = 0; |
e136d092 CL |
867 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) { |
868 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
869 | transport->tcp_flags |= TCP_RCV_COPY_XID; | |
51971139 | 870 | transport->tcp_copied = 0; |
a246b010 CL |
871 | } |
872 | } | |
873 | } | |
874 | ||
dd456471 | 875 | static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
876 | { |
877 | size_t len, used; | |
878 | char *p; | |
879 | ||
51971139 | 880 | len = sizeof(transport->tcp_xid) - transport->tcp_offset; |
46121cf7 | 881 | dprintk("RPC: reading XID (%Zu bytes)\n", len); |
51971139 | 882 | p = ((char *) &transport->tcp_xid) + transport->tcp_offset; |
9d292316 | 883 | used = xdr_skb_read_bits(desc, p, len); |
51971139 | 884 | transport->tcp_offset += used; |
a246b010 CL |
885 | if (used != len) |
886 | return; | |
e136d092 CL |
887 | transport->tcp_flags &= ~TCP_RCV_COPY_XID; |
888 | transport->tcp_flags |= TCP_RCV_COPY_DATA; | |
51971139 | 889 | transport->tcp_copied = 4; |
46121cf7 | 890 | dprintk("RPC: reading reply for XID %08x\n", |
51971139 CL |
891 | ntohl(transport->tcp_xid)); |
892 | xs_tcp_check_fraghdr(transport); | |
a246b010 CL |
893 | } |
894 | ||
dd456471 | 895 | static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc) |
a246b010 | 896 | { |
51971139 | 897 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 CL |
898 | struct rpc_rqst *req; |
899 | struct xdr_buf *rcvbuf; | |
900 | size_t len; | |
901 | ssize_t r; | |
902 | ||
903 | /* Find and lock the request corresponding to this xid */ | |
4a0f8c04 | 904 | spin_lock(&xprt->transport_lock); |
51971139 | 905 | req = xprt_lookup_rqst(xprt, transport->tcp_xid); |
a246b010 | 906 | if (!req) { |
e136d092 | 907 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 908 | dprintk("RPC: XID %08x request not found!\n", |
51971139 | 909 | ntohl(transport->tcp_xid)); |
4a0f8c04 | 910 | spin_unlock(&xprt->transport_lock); |
a246b010 CL |
911 | return; |
912 | } | |
913 | ||
914 | rcvbuf = &req->rq_private_buf; | |
915 | len = desc->count; | |
51971139 | 916 | if (len > transport->tcp_reclen - transport->tcp_offset) { |
dd456471 | 917 | struct xdr_skb_reader my_desc; |
a246b010 | 918 | |
51971139 | 919 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
920 | memcpy(&my_desc, desc, sizeof(my_desc)); |
921 | my_desc.count = len; | |
51971139 | 922 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 923 | &my_desc, xdr_skb_read_bits); |
a246b010 CL |
924 | desc->count -= r; |
925 | desc->offset += r; | |
926 | } else | |
51971139 | 927 | r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied, |
9d292316 | 928 | desc, xdr_skb_read_bits); |
a246b010 CL |
929 | |
930 | if (r > 0) { | |
51971139 CL |
931 | transport->tcp_copied += r; |
932 | transport->tcp_offset += r; | |
a246b010 CL |
933 | } |
934 | if (r != len) { | |
935 | /* Error when copying to the receive buffer, | |
936 | * usually because we weren't able to allocate | |
937 | * additional buffer pages. All we can do now | |
e136d092 | 938 | * is turn off TCP_RCV_COPY_DATA, so the request |
a246b010 CL |
939 | * will not receive any additional updates, |
940 | * and time out. | |
941 | * Any remaining data from this record will | |
942 | * be discarded. | |
943 | */ | |
e136d092 | 944 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
46121cf7 | 945 | dprintk("RPC: XID %08x truncated request\n", |
51971139 | 946 | ntohl(transport->tcp_xid)); |
46121cf7 CL |
947 | dprintk("RPC: xprt = %p, tcp_copied = %lu, " |
948 | "tcp_offset = %u, tcp_reclen = %u\n", | |
949 | xprt, transport->tcp_copied, | |
950 | transport->tcp_offset, transport->tcp_reclen); | |
a246b010 CL |
951 | goto out; |
952 | } | |
953 | ||
46121cf7 | 954 | dprintk("RPC: XID %08x read %Zd bytes\n", |
51971139 | 955 | ntohl(transport->tcp_xid), r); |
46121cf7 CL |
956 | dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, " |
957 | "tcp_reclen = %u\n", xprt, transport->tcp_copied, | |
958 | transport->tcp_offset, transport->tcp_reclen); | |
51971139 CL |
959 | |
960 | if (transport->tcp_copied == req->rq_private_buf.buflen) | |
e136d092 | 961 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; |
51971139 | 962 | else if (transport->tcp_offset == transport->tcp_reclen) { |
e136d092 CL |
963 | if (transport->tcp_flags & TCP_RCV_LAST_FRAG) |
964 | transport->tcp_flags &= ~TCP_RCV_COPY_DATA; | |
a246b010 CL |
965 | } |
966 | ||
967 | out: | |
e136d092 | 968 | if (!(transport->tcp_flags & TCP_RCV_COPY_DATA)) |
51971139 | 969 | xprt_complete_rqst(req->rq_task, transport->tcp_copied); |
4a0f8c04 | 970 | spin_unlock(&xprt->transport_lock); |
51971139 | 971 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
972 | } |
973 | ||
dd456471 | 974 | static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc) |
a246b010 CL |
975 | { |
976 | size_t len; | |
977 | ||
51971139 | 978 | len = transport->tcp_reclen - transport->tcp_offset; |
a246b010 CL |
979 | if (len > desc->count) |
980 | len = desc->count; | |
981 | desc->count -= len; | |
982 | desc->offset += len; | |
51971139 | 983 | transport->tcp_offset += len; |
46121cf7 | 984 | dprintk("RPC: discarded %Zu bytes\n", len); |
51971139 | 985 | xs_tcp_check_fraghdr(transport); |
a246b010 CL |
986 | } |
987 | ||
9903cd1c | 988 | static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len) |
a246b010 CL |
989 | { |
990 | struct rpc_xprt *xprt = rd_desc->arg.data; | |
51971139 | 991 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
dd456471 | 992 | struct xdr_skb_reader desc = { |
a246b010 CL |
993 | .skb = skb, |
994 | .offset = offset, | |
995 | .count = len, | |
9903cd1c | 996 | }; |
a246b010 | 997 | |
46121cf7 | 998 | dprintk("RPC: xs_tcp_data_recv started\n"); |
a246b010 CL |
999 | do { |
1000 | /* Read in a new fragment marker if necessary */ | |
1001 | /* Can we ever really expect to get completely empty fragments? */ | |
e136d092 | 1002 | if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) { |
9903cd1c | 1003 | xs_tcp_read_fraghdr(xprt, &desc); |
a246b010 CL |
1004 | continue; |
1005 | } | |
1006 | /* Read in the xid if necessary */ | |
e136d092 | 1007 | if (transport->tcp_flags & TCP_RCV_COPY_XID) { |
51971139 | 1008 | xs_tcp_read_xid(transport, &desc); |
a246b010 CL |
1009 | continue; |
1010 | } | |
1011 | /* Read in the request data */ | |
e136d092 | 1012 | if (transport->tcp_flags & TCP_RCV_COPY_DATA) { |
9903cd1c | 1013 | xs_tcp_read_request(xprt, &desc); |
a246b010 CL |
1014 | continue; |
1015 | } | |
1016 | /* Skip over any trailing bytes on short reads */ | |
51971139 | 1017 | xs_tcp_read_discard(transport, &desc); |
a246b010 | 1018 | } while (desc.count); |
46121cf7 | 1019 | dprintk("RPC: xs_tcp_data_recv done\n"); |
a246b010 CL |
1020 | return len - desc.count; |
1021 | } | |
1022 | ||
9903cd1c CL |
1023 | /** |
1024 | * xs_tcp_data_ready - "data ready" callback for TCP sockets | |
1025 | * @sk: socket with data to read | |
1026 | * @bytes: how much data to read | |
1027 | * | |
1028 | */ | |
1029 | static void xs_tcp_data_ready(struct sock *sk, int bytes) | |
a246b010 CL |
1030 | { |
1031 | struct rpc_xprt *xprt; | |
1032 | read_descriptor_t rd_desc; | |
1033 | ||
46121cf7 CL |
1034 | dprintk("RPC: xs_tcp_data_ready...\n"); |
1035 | ||
a246b010 | 1036 | read_lock(&sk->sk_callback_lock); |
9903cd1c | 1037 | if (!(xprt = xprt_from_sock(sk))) |
a246b010 | 1038 | goto out; |
a246b010 CL |
1039 | if (xprt->shutdown) |
1040 | goto out; | |
1041 | ||
9903cd1c | 1042 | /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ |
a246b010 CL |
1043 | rd_desc.arg.data = xprt; |
1044 | rd_desc.count = 65536; | |
9903cd1c | 1045 | tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); |
a246b010 CL |
1046 | out: |
1047 | read_unlock(&sk->sk_callback_lock); | |
1048 | } | |
1049 | ||
9903cd1c CL |
1050 | /** |
1051 | * xs_tcp_state_change - callback to handle TCP socket state changes | |
1052 | * @sk: socket whose state has changed | |
1053 | * | |
1054 | */ | |
1055 | static void xs_tcp_state_change(struct sock *sk) | |
a246b010 | 1056 | { |
9903cd1c | 1057 | struct rpc_xprt *xprt; |
a246b010 CL |
1058 | |
1059 | read_lock(&sk->sk_callback_lock); | |
1060 | if (!(xprt = xprt_from_sock(sk))) | |
1061 | goto out; | |
46121cf7 CL |
1062 | dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); |
1063 | dprintk("RPC: state %x conn %d dead %d zapped %d\n", | |
1064 | sk->sk_state, xprt_connected(xprt), | |
1065 | sock_flag(sk, SOCK_DEAD), | |
1066 | sock_flag(sk, SOCK_ZAPPED)); | |
a246b010 CL |
1067 | |
1068 | switch (sk->sk_state) { | |
1069 | case TCP_ESTABLISHED: | |
4a0f8c04 | 1070 | spin_lock_bh(&xprt->transport_lock); |
a246b010 | 1071 | if (!xprt_test_and_set_connected(xprt)) { |
51971139 CL |
1072 | struct sock_xprt *transport = container_of(xprt, |
1073 | struct sock_xprt, xprt); | |
1074 | ||
a246b010 | 1075 | /* Reset TCP record info */ |
51971139 CL |
1076 | transport->tcp_offset = 0; |
1077 | transport->tcp_reclen = 0; | |
1078 | transport->tcp_copied = 0; | |
e136d092 CL |
1079 | transport->tcp_flags = |
1080 | TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID; | |
51971139 | 1081 | |
03bf4b70 | 1082 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; |
44fbac22 | 1083 | xprt_wake_pending_tasks(xprt, 0); |
a246b010 | 1084 | } |
4a0f8c04 | 1085 | spin_unlock_bh(&xprt->transport_lock); |
a246b010 CL |
1086 | break; |
1087 | case TCP_SYN_SENT: | |
1088 | case TCP_SYN_RECV: | |
1089 | break; | |
632e3bdc TM |
1090 | case TCP_CLOSE_WAIT: |
1091 | /* Try to schedule an autoclose RPC calls */ | |
1092 | set_bit(XPRT_CLOSE_WAIT, &xprt->state); | |
1093 | if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) | |
c1384c9c | 1094 | queue_work(rpciod_workqueue, &xprt->task_cleanup); |
a246b010 CL |
1095 | default: |
1096 | xprt_disconnect(xprt); | |
a246b010 CL |
1097 | } |
1098 | out: | |
1099 | read_unlock(&sk->sk_callback_lock); | |
1100 | } | |
1101 | ||
9903cd1c | 1102 | /** |
c7b2cae8 CL |
1103 | * xs_udp_write_space - callback invoked when socket buffer space |
1104 | * becomes available | |
9903cd1c CL |
1105 | * @sk: socket whose state has changed |
1106 | * | |
a246b010 CL |
1107 | * Called when more output buffer space is available for this socket. |
1108 | * We try not to wake our writers until they can make "significant" | |
c7b2cae8 | 1109 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg |
a246b010 CL |
1110 | * with a bunch of small requests. |
1111 | */ | |
c7b2cae8 | 1112 | static void xs_udp_write_space(struct sock *sk) |
a246b010 | 1113 | { |
a246b010 | 1114 | read_lock(&sk->sk_callback_lock); |
a246b010 | 1115 | |
c7b2cae8 CL |
1116 | /* from net/core/sock.c:sock_def_write_space */ |
1117 | if (sock_writeable(sk)) { | |
1118 | struct socket *sock; | |
1119 | struct rpc_xprt *xprt; | |
1120 | ||
1121 | if (unlikely(!(sock = sk->sk_socket))) | |
a246b010 | 1122 | goto out; |
c7b2cae8 CL |
1123 | if (unlikely(!(xprt = xprt_from_sock(sk)))) |
1124 | goto out; | |
1125 | if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) | |
a246b010 | 1126 | goto out; |
c7b2cae8 CL |
1127 | |
1128 | xprt_write_space(xprt); | |
a246b010 CL |
1129 | } |
1130 | ||
c7b2cae8 CL |
1131 | out: |
1132 | read_unlock(&sk->sk_callback_lock); | |
1133 | } | |
a246b010 | 1134 | |
c7b2cae8 CL |
1135 | /** |
1136 | * xs_tcp_write_space - callback invoked when socket buffer space | |
1137 | * becomes available | |
1138 | * @sk: socket whose state has changed | |
1139 | * | |
1140 | * Called when more output buffer space is available for this socket. | |
1141 | * We try not to wake our writers until they can make "significant" | |
1142 | * progress, otherwise we'll waste resources thrashing kernel_sendmsg | |
1143 | * with a bunch of small requests. | |
1144 | */ | |
1145 | static void xs_tcp_write_space(struct sock *sk) | |
1146 | { | |
1147 | read_lock(&sk->sk_callback_lock); | |
1148 | ||
1149 | /* from net/core/stream.c:sk_stream_write_space */ | |
1150 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { | |
1151 | struct socket *sock; | |
1152 | struct rpc_xprt *xprt; | |
1153 | ||
1154 | if (unlikely(!(sock = sk->sk_socket))) | |
1155 | goto out; | |
1156 | if (unlikely(!(xprt = xprt_from_sock(sk)))) | |
1157 | goto out; | |
1158 | if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) | |
1159 | goto out; | |
1160 | ||
1161 | xprt_write_space(xprt); | |
1162 | } | |
1163 | ||
1164 | out: | |
a246b010 CL |
1165 | read_unlock(&sk->sk_callback_lock); |
1166 | } | |
1167 | ||
470056c2 | 1168 | static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt) |
a246b010 | 1169 | { |
ee0ac0c2 CL |
1170 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1171 | struct sock *sk = transport->inet; | |
a246b010 | 1172 | |
7c6e066e | 1173 | if (transport->rcvsize) { |
a246b010 | 1174 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
7c6e066e | 1175 | sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2; |
a246b010 | 1176 | } |
7c6e066e | 1177 | if (transport->sndsize) { |
a246b010 | 1178 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
7c6e066e | 1179 | sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2; |
a246b010 CL |
1180 | sk->sk_write_space(sk); |
1181 | } | |
1182 | } | |
1183 | ||
43118c29 | 1184 | /** |
470056c2 | 1185 | * xs_udp_set_buffer_size - set send and receive limits |
43118c29 | 1186 | * @xprt: generic transport |
470056c2 CL |
1187 | * @sndsize: requested size of send buffer, in bytes |
1188 | * @rcvsize: requested size of receive buffer, in bytes | |
43118c29 | 1189 | * |
470056c2 | 1190 | * Set socket send and receive buffer size limits. |
43118c29 | 1191 | */ |
470056c2 | 1192 | static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize) |
43118c29 | 1193 | { |
7c6e066e CL |
1194 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1195 | ||
1196 | transport->sndsize = 0; | |
470056c2 | 1197 | if (sndsize) |
7c6e066e CL |
1198 | transport->sndsize = sndsize + 1024; |
1199 | transport->rcvsize = 0; | |
470056c2 | 1200 | if (rcvsize) |
7c6e066e | 1201 | transport->rcvsize = rcvsize + 1024; |
470056c2 CL |
1202 | |
1203 | xs_udp_do_set_buffer_size(xprt); | |
43118c29 CL |
1204 | } |
1205 | ||
46c0ee8b CL |
1206 | /** |
1207 | * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport | |
1208 | * @task: task that timed out | |
1209 | * | |
1210 | * Adjust the congestion window after a retransmit timeout has occurred. | |
1211 | */ | |
1212 | static void xs_udp_timer(struct rpc_task *task) | |
1213 | { | |
1214 | xprt_adjust_cwnd(task, -ETIMEDOUT); | |
1215 | } | |
1216 | ||
b85d8806 CL |
1217 | static unsigned short xs_get_random_port(void) |
1218 | { | |
1219 | unsigned short range = xprt_max_resvport - xprt_min_resvport; | |
1220 | unsigned short rand = (unsigned short) net_random() % range; | |
1221 | return rand + xprt_min_resvport; | |
1222 | } | |
1223 | ||
92200412 CL |
1224 | /** |
1225 | * xs_set_port - reset the port number in the remote endpoint address | |
1226 | * @xprt: generic transport | |
1227 | * @port: new port number | |
1228 | * | |
1229 | */ | |
1230 | static void xs_set_port(struct rpc_xprt *xprt, unsigned short port) | |
1231 | { | |
95392c59 | 1232 | struct sockaddr *addr = xs_addr(xprt); |
c4efcb1d | 1233 | |
46121cf7 | 1234 | dprintk("RPC: setting port for xprt %p to %u\n", xprt, port); |
c4efcb1d | 1235 | |
20612005 CL |
1236 | switch (addr->sa_family) { |
1237 | case AF_INET: | |
1238 | ((struct sockaddr_in *)addr)->sin_port = htons(port); | |
1239 | break; | |
1240 | case AF_INET6: | |
1241 | ((struct sockaddr_in6 *)addr)->sin6_port = htons(port); | |
1242 | break; | |
1243 | default: | |
1244 | BUG(); | |
1245 | } | |
92200412 CL |
1246 | } |
1247 | ||
7dc753f0 | 1248 | static int xs_bind4(struct sock_xprt *transport, struct socket *sock) |
a246b010 CL |
1249 | { |
1250 | struct sockaddr_in myaddr = { | |
1251 | .sin_family = AF_INET, | |
1252 | }; | |
d3bc9a1d | 1253 | struct sockaddr_in *sa; |
529b33c6 | 1254 | int err; |
c8475461 | 1255 | unsigned short port = transport->port; |
a246b010 | 1256 | |
d3bc9a1d FM |
1257 | if (!transport->xprt.resvport) |
1258 | port = 0; | |
1259 | sa = (struct sockaddr_in *)&transport->addr; | |
1260 | myaddr.sin_addr = sa->sin_addr; | |
a246b010 CL |
1261 | do { |
1262 | myaddr.sin_port = htons(port); | |
e6242e92 | 1263 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, |
a246b010 | 1264 | sizeof(myaddr)); |
d3bc9a1d FM |
1265 | if (!transport->xprt.resvport) |
1266 | break; | |
a246b010 | 1267 | if (err == 0) { |
c8475461 | 1268 | transport->port = port; |
d3bc9a1d | 1269 | break; |
a246b010 | 1270 | } |
529b33c6 CL |
1271 | if (port <= xprt_min_resvport) |
1272 | port = xprt_max_resvport; | |
1273 | else | |
1274 | port--; | |
c8475461 | 1275 | } while (err == -EADDRINUSE && port != transport->port); |
7dc753f0 CL |
1276 | dprintk("RPC: %s "NIPQUAD_FMT":%u: %s (%d)\n", |
1277 | __FUNCTION__, NIPQUAD(myaddr.sin_addr), | |
1278 | port, err ? "failed" : "ok", err); | |
a246b010 CL |
1279 | return err; |
1280 | } | |
1281 | ||
90058d37 CL |
1282 | static int xs_bind6(struct sock_xprt *transport, struct socket *sock) |
1283 | { | |
1284 | struct sockaddr_in6 myaddr = { | |
1285 | .sin6_family = AF_INET6, | |
1286 | }; | |
1287 | struct sockaddr_in6 *sa; | |
1288 | int err; | |
1289 | unsigned short port = transport->port; | |
1290 | ||
1291 | if (!transport->xprt.resvport) | |
1292 | port = 0; | |
1293 | sa = (struct sockaddr_in6 *)&transport->addr; | |
1294 | myaddr.sin6_addr = sa->sin6_addr; | |
1295 | do { | |
1296 | myaddr.sin6_port = htons(port); | |
1297 | err = kernel_bind(sock, (struct sockaddr *) &myaddr, | |
1298 | sizeof(myaddr)); | |
1299 | if (!transport->xprt.resvport) | |
1300 | break; | |
1301 | if (err == 0) { | |
1302 | transport->port = port; | |
1303 | break; | |
1304 | } | |
1305 | if (port <= xprt_min_resvport) | |
1306 | port = xprt_max_resvport; | |
1307 | else | |
1308 | port--; | |
1309 | } while (err == -EADDRINUSE && port != transport->port); | |
1310 | dprintk("RPC: xs_bind6 "NIP6_FMT":%u: %s (%d)\n", | |
1311 | NIP6(myaddr.sin6_addr), port, err ? "failed" : "ok", err); | |
1312 | return err; | |
1313 | } | |
1314 | ||
ed07536e PZ |
1315 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
1316 | static struct lock_class_key xs_key[2]; | |
1317 | static struct lock_class_key xs_slock_key[2]; | |
1318 | ||
1319 | static inline void xs_reclassify_socket(struct socket *sock) | |
1320 | { | |
1321 | struct sock *sk = sock->sk; | |
1322 | BUG_ON(sk->sk_lock.owner != NULL); | |
1323 | switch (sk->sk_family) { | |
1324 | case AF_INET: | |
1325 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFS", | |
1326 | &xs_slock_key[0], "sk_lock-AF_INET-NFS", &xs_key[0]); | |
1327 | break; | |
1328 | ||
1329 | case AF_INET6: | |
1330 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFS", | |
1331 | &xs_slock_key[1], "sk_lock-AF_INET6-NFS", &xs_key[1]); | |
1332 | break; | |
1333 | ||
1334 | default: | |
1335 | BUG(); | |
1336 | } | |
1337 | } | |
1338 | #else | |
1339 | static inline void xs_reclassify_socket(struct socket *sock) | |
1340 | { | |
1341 | } | |
1342 | #endif | |
1343 | ||
16be2d20 CL |
1344 | static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
1345 | { | |
1346 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); | |
1347 | ||
1348 | if (!transport->inet) { | |
1349 | struct sock *sk = sock->sk; | |
1350 | ||
1351 | write_lock_bh(&sk->sk_callback_lock); | |
1352 | ||
1353 | sk->sk_user_data = xprt; | |
1354 | transport->old_data_ready = sk->sk_data_ready; | |
1355 | transport->old_state_change = sk->sk_state_change; | |
1356 | transport->old_write_space = sk->sk_write_space; | |
1357 | sk->sk_data_ready = xs_udp_data_ready; | |
1358 | sk->sk_write_space = xs_udp_write_space; | |
1359 | sk->sk_no_check = UDP_CSUM_NORCV; | |
1360 | sk->sk_allocation = GFP_ATOMIC; | |
1361 | ||
1362 | xprt_set_connected(xprt); | |
1363 | ||
1364 | /* Reset to new socket */ | |
1365 | transport->sock = sock; | |
1366 | transport->inet = sk; | |
1367 | ||
1368 | write_unlock_bh(&sk->sk_callback_lock); | |
1369 | } | |
1370 | xs_udp_do_set_buffer_size(xprt); | |
1371 | } | |
1372 | ||
b0d93ad5 | 1373 | /** |
9c3d72de | 1374 | * xs_udp_connect_worker4 - set up a UDP socket |
65f27f38 | 1375 | * @work: RPC transport to connect |
b0d93ad5 CL |
1376 | * |
1377 | * Invoked by a work queue tasklet. | |
1378 | */ | |
9c3d72de | 1379 | static void xs_udp_connect_worker4(struct work_struct *work) |
a246b010 | 1380 | { |
34161db6 TM |
1381 | struct sock_xprt *transport = |
1382 | container_of(work, struct sock_xprt, connect_worker.work); | |
c8475461 | 1383 | struct rpc_xprt *xprt = &transport->xprt; |
ee0ac0c2 | 1384 | struct socket *sock = transport->sock; |
b0d93ad5 | 1385 | int err, status = -EIO; |
9903cd1c | 1386 | |
ec739ef0 | 1387 | if (xprt->shutdown || !xprt_bound(xprt)) |
b0d93ad5 | 1388 | goto out; |
9903cd1c | 1389 | |
b0d93ad5 CL |
1390 | /* Start by resetting any existing state */ |
1391 | xs_close(xprt); | |
9903cd1c | 1392 | |
b0d93ad5 | 1393 | if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { |
46121cf7 | 1394 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); |
b0d93ad5 CL |
1395 | goto out; |
1396 | } | |
ed07536e | 1397 | xs_reclassify_socket(sock); |
9903cd1c | 1398 | |
7dc753f0 | 1399 | if (xs_bind4(transport, sock)) { |
b0d93ad5 CL |
1400 | sock_release(sock); |
1401 | goto out; | |
1402 | } | |
9903cd1c | 1403 | |
46121cf7 | 1404 | dprintk("RPC: worker connecting xprt %p to address: %s\n", |
7559c7a2 | 1405 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 1406 | |
16be2d20 | 1407 | xs_udp_finish_connecting(xprt, sock); |
b0d93ad5 CL |
1408 | status = 0; |
1409 | out: | |
1410 | xprt_wake_pending_tasks(xprt, status); | |
1411 | xprt_clear_connecting(xprt); | |
a246b010 CL |
1412 | } |
1413 | ||
68e220bd CL |
1414 | /** |
1415 | * xs_udp_connect_worker6 - set up a UDP socket | |
1416 | * @work: RPC transport to connect | |
1417 | * | |
1418 | * Invoked by a work queue tasklet. | |
1419 | */ | |
1420 | static void xs_udp_connect_worker6(struct work_struct *work) | |
1421 | { | |
1422 | struct sock_xprt *transport = | |
1423 | container_of(work, struct sock_xprt, connect_worker.work); | |
1424 | struct rpc_xprt *xprt = &transport->xprt; | |
1425 | struct socket *sock = transport->sock; | |
1426 | int err, status = -EIO; | |
1427 | ||
1428 | if (xprt->shutdown || !xprt_bound(xprt)) | |
1429 | goto out; | |
1430 | ||
1431 | /* Start by resetting any existing state */ | |
1432 | xs_close(xprt); | |
1433 | ||
1434 | if ((err = sock_create_kern(PF_INET6, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) { | |
1435 | dprintk("RPC: can't create UDP transport socket (%d).\n", -err); | |
1436 | goto out; | |
1437 | } | |
1438 | xs_reclassify_socket(sock); | |
1439 | ||
1440 | if (xs_bind6(transport, sock) < 0) { | |
1441 | sock_release(sock); | |
1442 | goto out; | |
1443 | } | |
1444 | ||
1445 | dprintk("RPC: worker connecting xprt %p to address: %s\n", | |
1446 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); | |
1447 | ||
1448 | xs_udp_finish_connecting(xprt, sock); | |
1449 | status = 0; | |
1450 | out: | |
1451 | xprt_wake_pending_tasks(xprt, status); | |
1452 | xprt_clear_connecting(xprt); | |
1453 | } | |
1454 | ||
3167e12c CL |
1455 | /* |
1456 | * We need to preserve the port number so the reply cache on the server can | |
1457 | * find our cached RPC replies when we get around to reconnecting. | |
1458 | */ | |
1459 | static void xs_tcp_reuse_connection(struct rpc_xprt *xprt) | |
1460 | { | |
1461 | int result; | |
ee0ac0c2 | 1462 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
3167e12c CL |
1463 | struct sockaddr any; |
1464 | ||
46121cf7 | 1465 | dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt); |
3167e12c CL |
1466 | |
1467 | /* | |
1468 | * Disconnect the transport socket by doing a connect operation | |
1469 | * with AF_UNSPEC. This should return immediately... | |
1470 | */ | |
1471 | memset(&any, 0, sizeof(any)); | |
1472 | any.sa_family = AF_UNSPEC; | |
ee0ac0c2 | 1473 | result = kernel_connect(transport->sock, &any, sizeof(any), 0); |
3167e12c | 1474 | if (result) |
46121cf7 | 1475 | dprintk("RPC: AF_UNSPEC connect return code %d\n", |
3167e12c CL |
1476 | result); |
1477 | } | |
1478 | ||
16be2d20 | 1479 | static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) |
a246b010 | 1480 | { |
16be2d20 | 1481 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
edb267a6 | 1482 | |
ee0ac0c2 | 1483 | if (!transport->inet) { |
b0d93ad5 CL |
1484 | struct sock *sk = sock->sk; |
1485 | ||
1486 | write_lock_bh(&sk->sk_callback_lock); | |
1487 | ||
1488 | sk->sk_user_data = xprt; | |
314dfd79 CL |
1489 | transport->old_data_ready = sk->sk_data_ready; |
1490 | transport->old_state_change = sk->sk_state_change; | |
1491 | transport->old_write_space = sk->sk_write_space; | |
b0d93ad5 CL |
1492 | sk->sk_data_ready = xs_tcp_data_ready; |
1493 | sk->sk_state_change = xs_tcp_state_change; | |
1494 | sk->sk_write_space = xs_tcp_write_space; | |
b079fa7b | 1495 | sk->sk_allocation = GFP_ATOMIC; |
3167e12c CL |
1496 | |
1497 | /* socket options */ | |
1498 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; | |
1499 | sock_reset_flag(sk, SOCK_LINGER); | |
1500 | tcp_sk(sk)->linger2 = 0; | |
1501 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; | |
b0d93ad5 CL |
1502 | |
1503 | xprt_clear_connected(xprt); | |
1504 | ||
1505 | /* Reset to new socket */ | |
ee0ac0c2 CL |
1506 | transport->sock = sock; |
1507 | transport->inet = sk; | |
b0d93ad5 CL |
1508 | |
1509 | write_unlock_bh(&sk->sk_callback_lock); | |
1510 | } | |
1511 | ||
1512 | /* Tell the socket layer to start connecting... */ | |
262ca07d CL |
1513 | xprt->stat.connect_count++; |
1514 | xprt->stat.connect_start = jiffies; | |
95392c59 | 1515 | return kernel_connect(sock, xs_addr(xprt), xprt->addrlen, O_NONBLOCK); |
16be2d20 CL |
1516 | } |
1517 | ||
1518 | /** | |
9c3d72de | 1519 | * xs_tcp_connect_worker4 - connect a TCP socket to a remote endpoint |
16be2d20 CL |
1520 | * @work: RPC transport to connect |
1521 | * | |
1522 | * Invoked by a work queue tasklet. | |
1523 | */ | |
9c3d72de | 1524 | static void xs_tcp_connect_worker4(struct work_struct *work) |
16be2d20 CL |
1525 | { |
1526 | struct sock_xprt *transport = | |
1527 | container_of(work, struct sock_xprt, connect_worker.work); | |
1528 | struct rpc_xprt *xprt = &transport->xprt; | |
1529 | struct socket *sock = transport->sock; | |
1530 | int err, status = -EIO; | |
1531 | ||
1532 | if (xprt->shutdown || !xprt_bound(xprt)) | |
1533 | goto out; | |
1534 | ||
1535 | if (!sock) { | |
1536 | /* start from scratch */ | |
1537 | if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { | |
1538 | dprintk("RPC: can't create TCP transport socket (%d).\n", -err); | |
1539 | goto out; | |
1540 | } | |
1541 | xs_reclassify_socket(sock); | |
1542 | ||
1543 | if (xs_bind4(transport, sock) < 0) { | |
1544 | sock_release(sock); | |
1545 | goto out; | |
1546 | } | |
1547 | } else | |
1548 | /* "close" the socket, preserving the local port */ | |
1549 | xs_tcp_reuse_connection(xprt); | |
1550 | ||
1551 | dprintk("RPC: worker connecting xprt %p to address: %s\n", | |
1552 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); | |
1553 | ||
1554 | status = xs_tcp_finish_connecting(xprt, sock); | |
46121cf7 CL |
1555 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", |
1556 | xprt, -status, xprt_connected(xprt), | |
1557 | sock->sk->sk_state); | |
a246b010 CL |
1558 | if (status < 0) { |
1559 | switch (status) { | |
1560 | case -EINPROGRESS: | |
1561 | case -EALREADY: | |
1562 | goto out_clear; | |
3167e12c CL |
1563 | case -ECONNREFUSED: |
1564 | case -ECONNRESET: | |
1565 | /* retry with existing socket, after a delay */ | |
1566 | break; | |
1567 | default: | |
1568 | /* get rid of existing socket, and retry */ | |
1569 | xs_close(xprt); | |
1570 | break; | |
a246b010 CL |
1571 | } |
1572 | } | |
1573 | out: | |
44fbac22 | 1574 | xprt_wake_pending_tasks(xprt, status); |
68e220bd CL |
1575 | out_clear: |
1576 | xprt_clear_connecting(xprt); | |
1577 | } | |
1578 | ||
1579 | /** | |
1580 | * xs_tcp_connect_worker6 - connect a TCP socket to a remote endpoint | |
1581 | * @work: RPC transport to connect | |
1582 | * | |
1583 | * Invoked by a work queue tasklet. | |
1584 | */ | |
1585 | static void xs_tcp_connect_worker6(struct work_struct *work) | |
1586 | { | |
1587 | struct sock_xprt *transport = | |
1588 | container_of(work, struct sock_xprt, connect_worker.work); | |
1589 | struct rpc_xprt *xprt = &transport->xprt; | |
1590 | struct socket *sock = transport->sock; | |
1591 | int err, status = -EIO; | |
1592 | ||
1593 | if (xprt->shutdown || !xprt_bound(xprt)) | |
1594 | goto out; | |
1595 | ||
1596 | if (!sock) { | |
1597 | /* start from scratch */ | |
1598 | if ((err = sock_create_kern(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) { | |
1599 | dprintk("RPC: can't create TCP transport socket (%d).\n", -err); | |
1600 | goto out; | |
1601 | } | |
1602 | xs_reclassify_socket(sock); | |
1603 | ||
1604 | if (xs_bind6(transport, sock) < 0) { | |
1605 | sock_release(sock); | |
1606 | goto out; | |
1607 | } | |
1608 | } else | |
1609 | /* "close" the socket, preserving the local port */ | |
1610 | xs_tcp_reuse_connection(xprt); | |
1611 | ||
1612 | dprintk("RPC: worker connecting xprt %p to address: %s\n", | |
1613 | xprt, xprt->address_strings[RPC_DISPLAY_ALL]); | |
1614 | ||
1615 | status = xs_tcp_finish_connecting(xprt, sock); | |
1616 | dprintk("RPC: %p connect status %d connected %d sock state %d\n", | |
1617 | xprt, -status, xprt_connected(xprt), sock->sk->sk_state); | |
1618 | if (status < 0) { | |
1619 | switch (status) { | |
1620 | case -EINPROGRESS: | |
1621 | case -EALREADY: | |
1622 | goto out_clear; | |
1623 | case -ECONNREFUSED: | |
1624 | case -ECONNRESET: | |
1625 | /* retry with existing socket, after a delay */ | |
1626 | break; | |
1627 | default: | |
1628 | /* get rid of existing socket, and retry */ | |
1629 | xs_close(xprt); | |
1630 | break; | |
1631 | } | |
1632 | } | |
1633 | out: | |
1634 | xprt_wake_pending_tasks(xprt, status); | |
a246b010 | 1635 | out_clear: |
2226feb6 | 1636 | xprt_clear_connecting(xprt); |
a246b010 CL |
1637 | } |
1638 | ||
9903cd1c CL |
1639 | /** |
1640 | * xs_connect - connect a socket to a remote endpoint | |
1641 | * @task: address of RPC task that manages state of connect request | |
1642 | * | |
1643 | * TCP: If the remote end dropped the connection, delay reconnecting. | |
03bf4b70 CL |
1644 | * |
1645 | * UDP socket connects are synchronous, but we use a work queue anyway | |
1646 | * to guarantee that even unprivileged user processes can set up a | |
1647 | * socket on a privileged port. | |
1648 | * | |
1649 | * If a UDP socket connect fails, the delay behavior here prevents | |
1650 | * retry floods (hard mounts). | |
9903cd1c CL |
1651 | */ |
1652 | static void xs_connect(struct rpc_task *task) | |
a246b010 CL |
1653 | { |
1654 | struct rpc_xprt *xprt = task->tk_xprt; | |
ee0ac0c2 | 1655 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 1656 | |
b0d93ad5 CL |
1657 | if (xprt_test_and_set_connecting(xprt)) |
1658 | return; | |
1659 | ||
ee0ac0c2 | 1660 | if (transport->sock != NULL) { |
46121cf7 CL |
1661 | dprintk("RPC: xs_connect delayed xprt %p for %lu " |
1662 | "seconds\n", | |
03bf4b70 | 1663 | xprt, xprt->reestablish_timeout / HZ); |
c1384c9c TM |
1664 | queue_delayed_work(rpciod_workqueue, |
1665 | &transport->connect_worker, | |
1666 | xprt->reestablish_timeout); | |
03bf4b70 CL |
1667 | xprt->reestablish_timeout <<= 1; |
1668 | if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO) | |
1669 | xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO; | |
b0d93ad5 | 1670 | } else { |
46121cf7 | 1671 | dprintk("RPC: xs_connect scheduled xprt %p\n", xprt); |
c1384c9c TM |
1672 | queue_delayed_work(rpciod_workqueue, |
1673 | &transport->connect_worker, 0); | |
a246b010 CL |
1674 | } |
1675 | } | |
1676 | ||
262ca07d CL |
1677 | /** |
1678 | * xs_udp_print_stats - display UDP socket-specifc stats | |
1679 | * @xprt: rpc_xprt struct containing statistics | |
1680 | * @seq: output file | |
1681 | * | |
1682 | */ | |
1683 | static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
1684 | { | |
c8475461 CL |
1685 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
1686 | ||
262ca07d | 1687 | seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n", |
c8475461 | 1688 | transport->port, |
262ca07d CL |
1689 | xprt->stat.bind_count, |
1690 | xprt->stat.sends, | |
1691 | xprt->stat.recvs, | |
1692 | xprt->stat.bad_xids, | |
1693 | xprt->stat.req_u, | |
1694 | xprt->stat.bklog_u); | |
1695 | } | |
1696 | ||
1697 | /** | |
1698 | * xs_tcp_print_stats - display TCP socket-specifc stats | |
1699 | * @xprt: rpc_xprt struct containing statistics | |
1700 | * @seq: output file | |
1701 | * | |
1702 | */ | |
1703 | static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq) | |
1704 | { | |
c8475461 | 1705 | struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); |
262ca07d CL |
1706 | long idle_time = 0; |
1707 | ||
1708 | if (xprt_connected(xprt)) | |
1709 | idle_time = (long)(jiffies - xprt->last_used) / HZ; | |
1710 | ||
1711 | seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n", | |
c8475461 | 1712 | transport->port, |
262ca07d CL |
1713 | xprt->stat.bind_count, |
1714 | xprt->stat.connect_count, | |
1715 | xprt->stat.connect_time, | |
1716 | idle_time, | |
1717 | xprt->stat.sends, | |
1718 | xprt->stat.recvs, | |
1719 | xprt->stat.bad_xids, | |
1720 | xprt->stat.req_u, | |
1721 | xprt->stat.bklog_u); | |
1722 | } | |
1723 | ||
262965f5 | 1724 | static struct rpc_xprt_ops xs_udp_ops = { |
43118c29 | 1725 | .set_buffer_size = xs_udp_set_buffer_size, |
12a80469 | 1726 | .reserve_xprt = xprt_reserve_xprt_cong, |
49e9a890 | 1727 | .release_xprt = xprt_release_xprt_cong, |
45160d62 | 1728 | .rpcbind = rpcb_getport_async, |
92200412 | 1729 | .set_port = xs_set_port, |
262965f5 | 1730 | .connect = xs_connect, |
02107148 CL |
1731 | .buf_alloc = rpc_malloc, |
1732 | .buf_free = rpc_free, | |
262965f5 | 1733 | .send_request = xs_udp_send_request, |
fe3aca29 | 1734 | .set_retrans_timeout = xprt_set_retrans_timeout_rtt, |
46c0ee8b | 1735 | .timer = xs_udp_timer, |
a58dd398 | 1736 | .release_request = xprt_release_rqst_cong, |
262965f5 CL |
1737 | .close = xs_close, |
1738 | .destroy = xs_destroy, | |
262ca07d | 1739 | .print_stats = xs_udp_print_stats, |
262965f5 CL |
1740 | }; |
1741 | ||
1742 | static struct rpc_xprt_ops xs_tcp_ops = { | |
12a80469 | 1743 | .reserve_xprt = xprt_reserve_xprt, |
e0ab53de | 1744 | .release_xprt = xs_tcp_release_xprt, |
45160d62 | 1745 | .rpcbind = rpcb_getport_async, |
92200412 | 1746 | .set_port = xs_set_port, |
9903cd1c | 1747 | .connect = xs_connect, |
02107148 CL |
1748 | .buf_alloc = rpc_malloc, |
1749 | .buf_free = rpc_free, | |
262965f5 | 1750 | .send_request = xs_tcp_send_request, |
fe3aca29 | 1751 | .set_retrans_timeout = xprt_set_retrans_timeout_def, |
9903cd1c CL |
1752 | .close = xs_close, |
1753 | .destroy = xs_destroy, | |
262ca07d | 1754 | .print_stats = xs_tcp_print_stats, |
a246b010 CL |
1755 | }; |
1756 | ||
96802a09 | 1757 | static struct rpc_xprt *xs_setup_xprt(struct rpc_xprtsock_create *args, unsigned int slot_table_size) |
c8541ecd CL |
1758 | { |
1759 | struct rpc_xprt *xprt; | |
ffc2e518 | 1760 | struct sock_xprt *new; |
c8541ecd | 1761 | |
96802a09 | 1762 | if (args->addrlen > sizeof(xprt->addr)) { |
46121cf7 | 1763 | dprintk("RPC: xs_setup_xprt: address too large\n"); |
c8541ecd CL |
1764 | return ERR_PTR(-EBADF); |
1765 | } | |
1766 | ||
ffc2e518 CL |
1767 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1768 | if (new == NULL) { | |
46121cf7 CL |
1769 | dprintk("RPC: xs_setup_xprt: couldn't allocate " |
1770 | "rpc_xprt\n"); | |
c8541ecd CL |
1771 | return ERR_PTR(-ENOMEM); |
1772 | } | |
ffc2e518 | 1773 | xprt = &new->xprt; |
c8541ecd CL |
1774 | |
1775 | xprt->max_reqs = slot_table_size; | |
1776 | xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL); | |
1777 | if (xprt->slot == NULL) { | |
1778 | kfree(xprt); | |
46121cf7 CL |
1779 | dprintk("RPC: xs_setup_xprt: couldn't allocate slot " |
1780 | "table\n"); | |
c8541ecd CL |
1781 | return ERR_PTR(-ENOMEM); |
1782 | } | |
1783 | ||
96802a09 FM |
1784 | memcpy(&xprt->addr, args->dstaddr, args->addrlen); |
1785 | xprt->addrlen = args->addrlen; | |
d3bc9a1d FM |
1786 | if (args->srcaddr) |
1787 | memcpy(&new->addr, args->srcaddr, args->addrlen); | |
c8475461 | 1788 | new->port = xs_get_random_port(); |
c8541ecd CL |
1789 | |
1790 | return xprt; | |
1791 | } | |
1792 | ||
9903cd1c CL |
1793 | /** |
1794 | * xs_setup_udp - Set up transport to use a UDP socket | |
96802a09 | 1795 | * @args: rpc transport creation arguments |
9903cd1c CL |
1796 | * |
1797 | */ | |
96802a09 | 1798 | struct rpc_xprt *xs_setup_udp(struct rpc_xprtsock_create *args) |
a246b010 | 1799 | { |
8f9d5b1a | 1800 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 1801 | struct rpc_xprt *xprt; |
c8475461 | 1802 | struct sock_xprt *transport; |
a246b010 | 1803 | |
96802a09 | 1804 | xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries); |
c8541ecd CL |
1805 | if (IS_ERR(xprt)) |
1806 | return xprt; | |
c8475461 | 1807 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 1808 | |
ec739ef0 | 1809 | xprt->prot = IPPROTO_UDP; |
808012fb | 1810 | xprt->tsh_size = 0; |
a246b010 CL |
1811 | /* XXX: header size can vary due to auth type, IPv6, etc. */ |
1812 | xprt->max_payload = (1U << 16) - (MAX_HEADER << 3); | |
1813 | ||
03bf4b70 CL |
1814 | xprt->bind_timeout = XS_BIND_TO; |
1815 | xprt->connect_timeout = XS_UDP_CONN_TO; | |
1816 | xprt->reestablish_timeout = XS_UDP_REEST_TO; | |
1817 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 1818 | |
262965f5 | 1819 | xprt->ops = &xs_udp_ops; |
a246b010 | 1820 | |
96802a09 FM |
1821 | if (args->timeout) |
1822 | xprt->timeout = *args->timeout; | |
a246b010 | 1823 | else |
9903cd1c | 1824 | xprt_set_timeout(&xprt->timeout, 5, 5 * HZ); |
a246b010 | 1825 | |
8f9d5b1a CL |
1826 | switch (addr->sa_family) { |
1827 | case AF_INET: | |
1828 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
1829 | xprt_set_bound(xprt); | |
1830 | ||
1831 | INIT_DELAYED_WORK(&transport->connect_worker, | |
1832 | xs_udp_connect_worker4); | |
1833 | xs_format_ipv4_peer_addresses(xprt); | |
1834 | break; | |
1835 | case AF_INET6: | |
1836 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
1837 | xprt_set_bound(xprt); | |
1838 | ||
1839 | INIT_DELAYED_WORK(&transport->connect_worker, | |
1840 | xs_udp_connect_worker6); | |
1841 | xs_format_ipv6_peer_addresses(xprt); | |
1842 | break; | |
1843 | default: | |
1844 | kfree(xprt); | |
1845 | return ERR_PTR(-EAFNOSUPPORT); | |
1846 | } | |
1847 | ||
46121cf7 | 1848 | dprintk("RPC: set up transport to address %s\n", |
7559c7a2 | 1849 | xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 1850 | |
c8541ecd | 1851 | return xprt; |
a246b010 CL |
1852 | } |
1853 | ||
9903cd1c CL |
1854 | /** |
1855 | * xs_setup_tcp - Set up transport to use a TCP socket | |
96802a09 | 1856 | * @args: rpc transport creation arguments |
9903cd1c CL |
1857 | * |
1858 | */ | |
96802a09 | 1859 | struct rpc_xprt *xs_setup_tcp(struct rpc_xprtsock_create *args) |
a246b010 | 1860 | { |
8f9d5b1a | 1861 | struct sockaddr *addr = args->dstaddr; |
c8541ecd | 1862 | struct rpc_xprt *xprt; |
c8475461 | 1863 | struct sock_xprt *transport; |
a246b010 | 1864 | |
96802a09 | 1865 | xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries); |
c8541ecd CL |
1866 | if (IS_ERR(xprt)) |
1867 | return xprt; | |
c8475461 | 1868 | transport = container_of(xprt, struct sock_xprt, xprt); |
a246b010 | 1869 | |
ec739ef0 | 1870 | xprt->prot = IPPROTO_TCP; |
808012fb | 1871 | xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32); |
808012fb | 1872 | xprt->max_payload = RPC_MAX_FRAGMENT_SIZE; |
a246b010 | 1873 | |
03bf4b70 CL |
1874 | xprt->bind_timeout = XS_BIND_TO; |
1875 | xprt->connect_timeout = XS_TCP_CONN_TO; | |
1876 | xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO; | |
1877 | xprt->idle_timeout = XS_IDLE_DISC_TO; | |
a246b010 | 1878 | |
262965f5 | 1879 | xprt->ops = &xs_tcp_ops; |
a246b010 | 1880 | |
96802a09 FM |
1881 | if (args->timeout) |
1882 | xprt->timeout = *args->timeout; | |
a246b010 | 1883 | else |
9903cd1c | 1884 | xprt_set_timeout(&xprt->timeout, 2, 60 * HZ); |
a246b010 | 1885 | |
8f9d5b1a CL |
1886 | switch (addr->sa_family) { |
1887 | case AF_INET: | |
1888 | if (((struct sockaddr_in *)addr)->sin_port != htons(0)) | |
1889 | xprt_set_bound(xprt); | |
1890 | ||
1891 | INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker4); | |
1892 | xs_format_ipv4_peer_addresses(xprt); | |
1893 | break; | |
1894 | case AF_INET6: | |
1895 | if (((struct sockaddr_in6 *)addr)->sin6_port != htons(0)) | |
1896 | xprt_set_bound(xprt); | |
1897 | ||
1898 | INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker6); | |
1899 | xs_format_ipv6_peer_addresses(xprt); | |
1900 | break; | |
1901 | default: | |
1902 | kfree(xprt); | |
1903 | return ERR_PTR(-EAFNOSUPPORT); | |
1904 | } | |
1905 | ||
46121cf7 | 1906 | dprintk("RPC: set up transport to address %s\n", |
7559c7a2 | 1907 | xprt->address_strings[RPC_DISPLAY_ALL]); |
edb267a6 | 1908 | |
c8541ecd | 1909 | return xprt; |
a246b010 | 1910 | } |
282b32e1 CL |
1911 | |
1912 | /** | |
fbf76683 | 1913 | * init_socket_xprt - set up xprtsock's sysctls |
282b32e1 CL |
1914 | * |
1915 | */ | |
1916 | int init_socket_xprt(void) | |
1917 | { | |
fbf76683 | 1918 | #ifdef RPC_DEBUG |
2b1bec5f | 1919 | if (!sunrpc_table_header) |
0b4d4147 | 1920 | sunrpc_table_header = register_sysctl_table(sunrpc_table); |
fbf76683 CL |
1921 | #endif |
1922 | ||
282b32e1 CL |
1923 | return 0; |
1924 | } | |
1925 | ||
1926 | /** | |
fbf76683 | 1927 | * cleanup_socket_xprt - remove xprtsock's sysctls |
282b32e1 CL |
1928 | * |
1929 | */ | |
1930 | void cleanup_socket_xprt(void) | |
1931 | { | |
fbf76683 CL |
1932 | #ifdef RPC_DEBUG |
1933 | if (sunrpc_table_header) { | |
1934 | unregister_sysctl_table(sunrpc_table_header); | |
1935 | sunrpc_table_header = NULL; | |
1936 | } | |
1937 | #endif | |
282b32e1 | 1938 | } |