2 * linux/net/sunrpc/xprtsock.c
4 * Client-side transport implementation for sockets.
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>
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>
15 * IP socket transport implementation, (C) 2005 Chuck Lever <cel@netapp.com>
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>
25 #include <linux/net.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>
34 #include <net/checksum.h>
41 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
42 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
44 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
45 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
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.
52 * We simply need to make sure that we don't collide with
53 * someone else's file names!
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;
63 static struct ctl_table_header *sunrpc_table_header;
66 * FIXME: changing the UDP slot table size should also resize the UDP
67 * socket buffers for existing UDP transports
69 static ctl_table xs_tunables_table[] = {
71 .ctl_name = CTL_SLOTTABLE_UDP,
72 .procname = "udp_slot_table_entries",
73 .data = &xprt_udp_slot_table_entries,
74 .maxlen = sizeof(unsigned int),
76 .proc_handler = &proc_dointvec_minmax,
77 .strategy = &sysctl_intvec,
78 .extra1 = &min_slot_table_size,
79 .extra2 = &max_slot_table_size
82 .ctl_name = CTL_SLOTTABLE_TCP,
83 .procname = "tcp_slot_table_entries",
84 .data = &xprt_tcp_slot_table_entries,
85 .maxlen = sizeof(unsigned int),
87 .proc_handler = &proc_dointvec_minmax,
88 .strategy = &sysctl_intvec,
89 .extra1 = &min_slot_table_size,
90 .extra2 = &max_slot_table_size
93 .ctl_name = CTL_MIN_RESVPORT,
94 .procname = "min_resvport",
95 .data = &xprt_min_resvport,
96 .maxlen = sizeof(unsigned int),
98 .proc_handler = &proc_dointvec_minmax,
99 .strategy = &sysctl_intvec,
100 .extra1 = &xprt_min_resvport_limit,
101 .extra2 = &xprt_max_resvport_limit
104 .ctl_name = CTL_MAX_RESVPORT,
105 .procname = "max_resvport",
106 .data = &xprt_max_resvport,
107 .maxlen = sizeof(unsigned int),
109 .proc_handler = &proc_dointvec_minmax,
110 .strategy = &sysctl_intvec,
111 .extra1 = &xprt_min_resvport_limit,
112 .extra2 = &xprt_max_resvport_limit
119 static ctl_table sunrpc_table[] = {
121 .ctl_name = CTL_SUNRPC,
122 .procname = "sunrpc",
124 .child = xs_tunables_table
134 * How many times to try sending a request on a socket before waiting
135 * for the socket buffer to clear.
137 #define XS_SENDMSG_RETRY (10U)
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.
144 #define XS_UDP_CONN_TO (5U * HZ)
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.
151 #define XS_TCP_CONN_TO (60U * HZ)
154 * Wait duration for a reply from the RPC portmapper.
156 #define XS_BIND_TO (60U * HZ)
159 * Delay if a UDP socket connect error occurs. This is most likely some
160 * kind of resource problem on the local host.
162 #define XS_UDP_REEST_TO (2U * HZ)
165 * The reestablish timeout allows clients to delay for a bit before attempting
166 * to reconnect to a server that just dropped our connection.
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.
173 #define XS_TCP_INIT_REEST_TO (3U * HZ)
174 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
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.
181 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
184 # undef RPC_DEBUG_DATA
185 # define RPCDBG_FACILITY RPCDBG_TRANS
188 #ifdef RPC_DEBUG_DATA
189 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
191 u8 *buf = (u8 *) packet;
194 dprintk("RPC: %s\n", msg);
195 for (j = 0; j < count && j < 128; j += 4) {
199 dprintk("0x%04x ", j);
201 dprintk("%02x%02x%02x%02x ",
202 buf[j], buf[j+1], buf[j+2], buf[j+3]);
207 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
214 struct rpc_xprt xprt;
219 struct socket * sock;
223 * State of TCP reply receive
231 unsigned long tcp_copied,
235 * Connection of transports
237 struct delayed_work connect_worker;
238 struct sockaddr_storage addr;
242 * UDP socket buffer size parameters
248 * Saved socket callback addresses
250 void (*old_data_ready)(struct sock *, int);
251 void (*old_state_change)(struct sock *);
252 void (*old_write_space)(struct sock *);
256 * TCP receive state flags
258 #define TCP_RCV_LAST_FRAG (1UL << 0)
259 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
260 #define TCP_RCV_COPY_XID (1UL << 2)
261 #define TCP_RCV_COPY_DATA (1UL << 3)
263 static void xs_format_peer_addresses(struct rpc_xprt *xprt)
265 struct sockaddr_in *addr = (struct sockaddr_in *) &xprt->addr;
268 buf = kzalloc(20, GFP_KERNEL);
270 snprintf(buf, 20, NIPQUAD_FMT,
271 NIPQUAD(addr->sin_addr.s_addr));
273 xprt->address_strings[RPC_DISPLAY_ADDR] = buf;
275 buf = kzalloc(8, GFP_KERNEL);
277 snprintf(buf, 8, "%u",
278 ntohs(addr->sin_port));
280 xprt->address_strings[RPC_DISPLAY_PORT] = buf;
282 if (xprt->prot == IPPROTO_UDP)
283 xprt->address_strings[RPC_DISPLAY_PROTO] = "udp";
285 xprt->address_strings[RPC_DISPLAY_PROTO] = "tcp";
287 buf = kzalloc(48, GFP_KERNEL);
289 snprintf(buf, 48, "addr="NIPQUAD_FMT" port=%u proto=%s",
290 NIPQUAD(addr->sin_addr.s_addr),
291 ntohs(addr->sin_port),
292 xprt->prot == IPPROTO_UDP ? "udp" : "tcp");
294 xprt->address_strings[RPC_DISPLAY_ALL] = buf;
297 static void xs_free_peer_addresses(struct rpc_xprt *xprt)
299 kfree(xprt->address_strings[RPC_DISPLAY_ADDR]);
300 kfree(xprt->address_strings[RPC_DISPLAY_PORT]);
301 kfree(xprt->address_strings[RPC_DISPLAY_ALL]);
304 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
306 static int xs_send_kvec(struct socket *sock, struct sockaddr *addr, int addrlen, struct kvec *vec, unsigned int base, int more)
308 struct msghdr msg = {
310 .msg_namelen = addrlen,
311 .msg_flags = XS_SENDMSG_FLAGS | (more ? MSG_MORE : 0),
314 .iov_base = vec->iov_base + base,
315 .iov_len = vec->iov_len - base,
318 if (iov.iov_len != 0)
319 return kernel_sendmsg(sock, &msg, &iov, 1, iov.iov_len);
320 return kernel_sendmsg(sock, &msg, NULL, 0, 0);
323 static int xs_send_pagedata(struct socket *sock, struct xdr_buf *xdr, unsigned int base, int more)
326 unsigned int remainder;
329 remainder = xdr->page_len - base;
330 base += xdr->page_base;
331 ppage = xdr->pages + (base >> PAGE_SHIFT);
334 unsigned int len = min_t(unsigned int, PAGE_SIZE - base, remainder);
335 int flags = XS_SENDMSG_FLAGS;
338 if (remainder != 0 || more)
340 err = sock->ops->sendpage(sock, *ppage, base, len, flags);
341 if (remainder == 0 || err != len)
355 * xs_sendpages - write pages directly to a socket
356 * @sock: socket to send on
357 * @addr: UDP only -- address of destination
358 * @addrlen: UDP only -- length of destination address
359 * @xdr: buffer containing this request
360 * @base: starting position in the buffer
363 static int xs_sendpages(struct socket *sock, struct sockaddr *addr, int addrlen, struct xdr_buf *xdr, unsigned int base)
365 unsigned int remainder = xdr->len - base;
371 clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
377 if (base < xdr->head[0].iov_len || addr != NULL) {
378 unsigned int len = xdr->head[0].iov_len - base;
380 err = xs_send_kvec(sock, addr, addrlen, &xdr->head[0], base, remainder != 0);
381 if (remainder == 0 || err != len)
386 base -= xdr->head[0].iov_len;
388 if (base < xdr->page_len) {
389 unsigned int len = xdr->page_len - base;
391 err = xs_send_pagedata(sock, xdr, base, remainder != 0);
392 if (remainder == 0 || err != len)
397 base -= xdr->page_len;
399 if (base >= xdr->tail[0].iov_len)
401 err = xs_send_kvec(sock, NULL, 0, &xdr->tail[0], base, 0);
411 * xs_nospace - place task on wait queue if transmit was incomplete
412 * @task: task to put to sleep
415 static void xs_nospace(struct rpc_task *task)
417 struct rpc_rqst *req = task->tk_rqstp;
418 struct rpc_xprt *xprt = req->rq_xprt;
419 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
421 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
422 task->tk_pid, req->rq_slen - req->rq_bytes_sent,
425 if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) {
426 /* Protect against races with write_space */
427 spin_lock_bh(&xprt->transport_lock);
429 /* Don't race with disconnect */
430 if (!xprt_connected(xprt))
431 task->tk_status = -ENOTCONN;
432 else if (test_bit(SOCK_NOSPACE, &transport->sock->flags))
433 xprt_wait_for_buffer_space(task);
435 spin_unlock_bh(&xprt->transport_lock);
437 /* Keep holding the socket if it is blocked */
438 rpc_delay(task, HZ>>4);
442 * xs_udp_send_request - write an RPC request to a UDP socket
443 * @task: address of RPC task that manages the state of an RPC request
446 * 0: The request has been sent
447 * EAGAIN: The socket was blocked, please call again later to
448 * complete the request
449 * ENOTCONN: Caller needs to invoke connect logic then call again
450 * other: Some other error occured, the request was not sent
452 static int xs_udp_send_request(struct rpc_task *task)
454 struct rpc_rqst *req = task->tk_rqstp;
455 struct rpc_xprt *xprt = req->rq_xprt;
456 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
457 struct xdr_buf *xdr = &req->rq_snd_buf;
460 xs_pktdump("packet data:",
461 req->rq_svec->iov_base,
462 req->rq_svec->iov_len);
464 req->rq_xtime = jiffies;
465 status = xs_sendpages(transport->sock,
466 (struct sockaddr *) &xprt->addr,
470 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
471 xdr->len - req->rq_bytes_sent, status);
473 if (likely(status >= (int) req->rq_slen))
476 /* Still some bytes left; set up for a retry later. */
484 /* When the server has died, an ICMP port unreachable message
485 * prompts ECONNREFUSED. */
491 dprintk("RPC: sendmsg returned unrecognized error %d\n",
499 static inline void xs_encode_tcp_record_marker(struct xdr_buf *buf)
501 u32 reclen = buf->len - sizeof(rpc_fraghdr);
502 rpc_fraghdr *base = buf->head[0].iov_base;
503 *base = htonl(RPC_LAST_STREAM_FRAGMENT | reclen);
507 * xs_tcp_send_request - write an RPC request to a TCP socket
508 * @task: address of RPC task that manages the state of an RPC request
511 * 0: The request has been sent
512 * EAGAIN: The socket was blocked, please call again later to
513 * complete the request
514 * ENOTCONN: Caller needs to invoke connect logic then call again
515 * other: Some other error occured, the request was not sent
517 * XXX: In the case of soft timeouts, should we eventually give up
518 * if sendmsg is not able to make progress?
520 static int xs_tcp_send_request(struct rpc_task *task)
522 struct rpc_rqst *req = task->tk_rqstp;
523 struct rpc_xprt *xprt = req->rq_xprt;
524 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
525 struct xdr_buf *xdr = &req->rq_snd_buf;
527 unsigned int retry = 0;
529 xs_encode_tcp_record_marker(&req->rq_snd_buf);
531 xs_pktdump("packet data:",
532 req->rq_svec->iov_base,
533 req->rq_svec->iov_len);
535 /* Continue transmitting the packet/record. We must be careful
536 * to cope with writespace callbacks arriving _after_ we have
537 * called sendmsg(). */
539 req->rq_xtime = jiffies;
540 status = xs_sendpages(transport->sock,
541 NULL, 0, xdr, req->rq_bytes_sent);
543 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
544 xdr->len - req->rq_bytes_sent, status);
546 if (unlikely(status < 0))
549 /* If we've sent the entire packet, immediately
550 * reset the count of bytes sent. */
551 req->rq_bytes_sent += status;
552 task->tk_bytes_sent += status;
553 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
554 req->rq_bytes_sent = 0;
559 if (retry++ > XS_SENDMSG_RETRY)
574 dprintk("RPC: sendmsg returned unrecognized error %d\n",
576 xprt_disconnect(xprt);
584 * xs_tcp_release_xprt - clean up after a tcp transmission
588 * This cleans up if an error causes us to abort the transmission of a request.
589 * In this case, the socket may need to be reset in order to avoid confusing
592 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
594 struct rpc_rqst *req;
596 if (task != xprt->snd_task)
600 req = task->tk_rqstp;
601 if (req->rq_bytes_sent == 0)
603 if (req->rq_bytes_sent == req->rq_snd_buf.len)
605 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
607 xprt_release_xprt(xprt, task);
611 * xs_close - close a socket
614 * This is used when all requests are complete; ie, no DRC state remains
615 * on the server we want to save.
617 static void xs_close(struct rpc_xprt *xprt)
619 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
620 struct socket *sock = transport->sock;
621 struct sock *sk = transport->inet;
624 goto clear_close_wait;
626 dprintk("RPC: xs_close xprt %p\n", xprt);
628 write_lock_bh(&sk->sk_callback_lock);
629 transport->inet = NULL;
630 transport->sock = NULL;
632 sk->sk_user_data = NULL;
633 sk->sk_data_ready = transport->old_data_ready;
634 sk->sk_state_change = transport->old_state_change;
635 sk->sk_write_space = transport->old_write_space;
636 write_unlock_bh(&sk->sk_callback_lock);
642 smp_mb__before_clear_bit();
643 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
644 smp_mb__after_clear_bit();
648 * xs_destroy - prepare to shutdown a transport
649 * @xprt: doomed transport
652 static void xs_destroy(struct rpc_xprt *xprt)
654 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
656 dprintk("RPC: xs_destroy xprt %p\n", xprt);
658 cancel_rearming_delayed_work(&transport->connect_worker);
660 xprt_disconnect(xprt);
662 xs_free_peer_addresses(xprt);
667 static inline struct rpc_xprt *xprt_from_sock(struct sock *sk)
669 return (struct rpc_xprt *) sk->sk_user_data;
673 * xs_udp_data_ready - "data ready" callback for UDP sockets
674 * @sk: socket with data to read
675 * @len: how much data to read
678 static void xs_udp_data_ready(struct sock *sk, int len)
680 struct rpc_task *task;
681 struct rpc_xprt *xprt;
682 struct rpc_rqst *rovr;
684 int err, repsize, copied;
688 read_lock(&sk->sk_callback_lock);
689 dprintk("RPC: xs_udp_data_ready...\n");
690 if (!(xprt = xprt_from_sock(sk)))
693 if ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL)
699 repsize = skb->len - sizeof(struct udphdr);
701 dprintk("RPC: impossible RPC reply size %d!\n", repsize);
705 /* Copy the XID from the skb... */
706 xp = skb_header_pointer(skb, sizeof(struct udphdr),
707 sizeof(_xid), &_xid);
711 /* Look up and lock the request corresponding to the given XID */
712 spin_lock(&xprt->transport_lock);
713 rovr = xprt_lookup_rqst(xprt, *xp);
716 task = rovr->rq_task;
718 if ((copied = rovr->rq_private_buf.buflen) > repsize)
721 /* Suck it into the iovec, verify checksum if not done by hw. */
722 if (csum_partial_copy_to_xdr(&rovr->rq_private_buf, skb))
725 /* Something worked... */
726 dst_confirm(skb->dst);
728 xprt_adjust_cwnd(task, copied);
729 xprt_update_rtt(task);
730 xprt_complete_rqst(task, copied);
733 spin_unlock(&xprt->transport_lock);
735 skb_free_datagram(sk, skb);
737 read_unlock(&sk->sk_callback_lock);
740 static inline void xs_tcp_read_fraghdr(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
742 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
746 p = ((char *) &transport->tcp_fraghdr) + transport->tcp_offset;
747 len = sizeof(transport->tcp_fraghdr) - transport->tcp_offset;
748 used = xdr_skb_read_bits(desc, p, len);
749 transport->tcp_offset += used;
753 transport->tcp_reclen = ntohl(transport->tcp_fraghdr);
754 if (transport->tcp_reclen & RPC_LAST_STREAM_FRAGMENT)
755 transport->tcp_flags |= TCP_RCV_LAST_FRAG;
757 transport->tcp_flags &= ~TCP_RCV_LAST_FRAG;
758 transport->tcp_reclen &= RPC_FRAGMENT_SIZE_MASK;
760 transport->tcp_flags &= ~TCP_RCV_COPY_FRAGHDR;
761 transport->tcp_offset = 0;
763 /* Sanity check of the record length */
764 if (unlikely(transport->tcp_reclen < 4)) {
765 dprintk("RPC: invalid TCP record fragment length\n");
766 xprt_disconnect(xprt);
769 dprintk("RPC: reading TCP record fragment of length %d\n",
770 transport->tcp_reclen);
773 static void xs_tcp_check_fraghdr(struct sock_xprt *transport)
775 if (transport->tcp_offset == transport->tcp_reclen) {
776 transport->tcp_flags |= TCP_RCV_COPY_FRAGHDR;
777 transport->tcp_offset = 0;
778 if (transport->tcp_flags & TCP_RCV_LAST_FRAG) {
779 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
780 transport->tcp_flags |= TCP_RCV_COPY_XID;
781 transport->tcp_copied = 0;
786 static inline void xs_tcp_read_xid(struct sock_xprt *transport, struct xdr_skb_reader *desc)
791 len = sizeof(transport->tcp_xid) - transport->tcp_offset;
792 dprintk("RPC: reading XID (%Zu bytes)\n", len);
793 p = ((char *) &transport->tcp_xid) + transport->tcp_offset;
794 used = xdr_skb_read_bits(desc, p, len);
795 transport->tcp_offset += used;
798 transport->tcp_flags &= ~TCP_RCV_COPY_XID;
799 transport->tcp_flags |= TCP_RCV_COPY_DATA;
800 transport->tcp_copied = 4;
801 dprintk("RPC: reading reply for XID %08x\n",
802 ntohl(transport->tcp_xid));
803 xs_tcp_check_fraghdr(transport);
806 static inline void xs_tcp_read_request(struct rpc_xprt *xprt, struct xdr_skb_reader *desc)
808 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
809 struct rpc_rqst *req;
810 struct xdr_buf *rcvbuf;
814 /* Find and lock the request corresponding to this xid */
815 spin_lock(&xprt->transport_lock);
816 req = xprt_lookup_rqst(xprt, transport->tcp_xid);
818 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
819 dprintk("RPC: XID %08x request not found!\n",
820 ntohl(transport->tcp_xid));
821 spin_unlock(&xprt->transport_lock);
825 rcvbuf = &req->rq_private_buf;
827 if (len > transport->tcp_reclen - transport->tcp_offset) {
828 struct xdr_skb_reader my_desc;
830 len = transport->tcp_reclen - transport->tcp_offset;
831 memcpy(&my_desc, desc, sizeof(my_desc));
833 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
834 &my_desc, xdr_skb_read_bits);
838 r = xdr_partial_copy_from_skb(rcvbuf, transport->tcp_copied,
839 desc, xdr_skb_read_bits);
842 transport->tcp_copied += r;
843 transport->tcp_offset += r;
846 /* Error when copying to the receive buffer,
847 * usually because we weren't able to allocate
848 * additional buffer pages. All we can do now
849 * is turn off TCP_RCV_COPY_DATA, so the request
850 * will not receive any additional updates,
852 * Any remaining data from this record will
855 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
856 dprintk("RPC: XID %08x truncated request\n",
857 ntohl(transport->tcp_xid));
858 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
859 "tcp_offset = %u, tcp_reclen = %u\n",
860 xprt, transport->tcp_copied,
861 transport->tcp_offset, transport->tcp_reclen);
865 dprintk("RPC: XID %08x read %Zd bytes\n",
866 ntohl(transport->tcp_xid), r);
867 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
868 "tcp_reclen = %u\n", xprt, transport->tcp_copied,
869 transport->tcp_offset, transport->tcp_reclen);
871 if (transport->tcp_copied == req->rq_private_buf.buflen)
872 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
873 else if (transport->tcp_offset == transport->tcp_reclen) {
874 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
875 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
879 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
880 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
881 spin_unlock(&xprt->transport_lock);
882 xs_tcp_check_fraghdr(transport);
885 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
889 len = transport->tcp_reclen - transport->tcp_offset;
890 if (len > desc->count)
894 transport->tcp_offset += len;
895 dprintk("RPC: discarded %Zu bytes\n", len);
896 xs_tcp_check_fraghdr(transport);
899 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
901 struct rpc_xprt *xprt = rd_desc->arg.data;
902 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
903 struct xdr_skb_reader desc = {
909 dprintk("RPC: xs_tcp_data_recv started\n");
911 /* Read in a new fragment marker if necessary */
912 /* Can we ever really expect to get completely empty fragments? */
913 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
914 xs_tcp_read_fraghdr(xprt, &desc);
917 /* Read in the xid if necessary */
918 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
919 xs_tcp_read_xid(transport, &desc);
922 /* Read in the request data */
923 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
924 xs_tcp_read_request(xprt, &desc);
927 /* Skip over any trailing bytes on short reads */
928 xs_tcp_read_discard(transport, &desc);
929 } while (desc.count);
930 dprintk("RPC: xs_tcp_data_recv done\n");
931 return len - desc.count;
935 * xs_tcp_data_ready - "data ready" callback for TCP sockets
936 * @sk: socket with data to read
937 * @bytes: how much data to read
940 static void xs_tcp_data_ready(struct sock *sk, int bytes)
942 struct rpc_xprt *xprt;
943 read_descriptor_t rd_desc;
945 dprintk("RPC: xs_tcp_data_ready...\n");
947 read_lock(&sk->sk_callback_lock);
948 if (!(xprt = xprt_from_sock(sk)))
953 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
954 rd_desc.arg.data = xprt;
955 rd_desc.count = 65536;
956 tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
958 read_unlock(&sk->sk_callback_lock);
962 * xs_tcp_state_change - callback to handle TCP socket state changes
963 * @sk: socket whose state has changed
966 static void xs_tcp_state_change(struct sock *sk)
968 struct rpc_xprt *xprt;
970 read_lock(&sk->sk_callback_lock);
971 if (!(xprt = xprt_from_sock(sk)))
973 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
974 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
975 sk->sk_state, xprt_connected(xprt),
976 sock_flag(sk, SOCK_DEAD),
977 sock_flag(sk, SOCK_ZAPPED));
979 switch (sk->sk_state) {
980 case TCP_ESTABLISHED:
981 spin_lock_bh(&xprt->transport_lock);
982 if (!xprt_test_and_set_connected(xprt)) {
983 struct sock_xprt *transport = container_of(xprt,
984 struct sock_xprt, xprt);
986 /* Reset TCP record info */
987 transport->tcp_offset = 0;
988 transport->tcp_reclen = 0;
989 transport->tcp_copied = 0;
990 transport->tcp_flags =
991 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
993 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
994 xprt_wake_pending_tasks(xprt, 0);
996 spin_unlock_bh(&xprt->transport_lock);
1001 case TCP_CLOSE_WAIT:
1002 /* Try to schedule an autoclose RPC calls */
1003 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
1004 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
1005 queue_work(rpciod_workqueue, &xprt->task_cleanup);
1007 xprt_disconnect(xprt);
1010 read_unlock(&sk->sk_callback_lock);
1014 * xs_udp_write_space - callback invoked when socket buffer space
1016 * @sk: socket whose state has changed
1018 * Called when more output buffer space is available for this socket.
1019 * We try not to wake our writers until they can make "significant"
1020 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1021 * with a bunch of small requests.
1023 static void xs_udp_write_space(struct sock *sk)
1025 read_lock(&sk->sk_callback_lock);
1027 /* from net/core/sock.c:sock_def_write_space */
1028 if (sock_writeable(sk)) {
1029 struct socket *sock;
1030 struct rpc_xprt *xprt;
1032 if (unlikely(!(sock = sk->sk_socket)))
1034 if (unlikely(!(xprt = xprt_from_sock(sk))))
1036 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1039 xprt_write_space(xprt);
1043 read_unlock(&sk->sk_callback_lock);
1047 * xs_tcp_write_space - callback invoked when socket buffer space
1049 * @sk: socket whose state has changed
1051 * Called when more output buffer space is available for this socket.
1052 * We try not to wake our writers until they can make "significant"
1053 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1054 * with a bunch of small requests.
1056 static void xs_tcp_write_space(struct sock *sk)
1058 read_lock(&sk->sk_callback_lock);
1060 /* from net/core/stream.c:sk_stream_write_space */
1061 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1062 struct socket *sock;
1063 struct rpc_xprt *xprt;
1065 if (unlikely(!(sock = sk->sk_socket)))
1067 if (unlikely(!(xprt = xprt_from_sock(sk))))
1069 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1072 xprt_write_space(xprt);
1076 read_unlock(&sk->sk_callback_lock);
1079 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1081 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1082 struct sock *sk = transport->inet;
1084 if (transport->rcvsize) {
1085 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1086 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1088 if (transport->sndsize) {
1089 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1090 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1091 sk->sk_write_space(sk);
1096 * xs_udp_set_buffer_size - set send and receive limits
1097 * @xprt: generic transport
1098 * @sndsize: requested size of send buffer, in bytes
1099 * @rcvsize: requested size of receive buffer, in bytes
1101 * Set socket send and receive buffer size limits.
1103 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1105 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1107 transport->sndsize = 0;
1109 transport->sndsize = sndsize + 1024;
1110 transport->rcvsize = 0;
1112 transport->rcvsize = rcvsize + 1024;
1114 xs_udp_do_set_buffer_size(xprt);
1118 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1119 * @task: task that timed out
1121 * Adjust the congestion window after a retransmit timeout has occurred.
1123 static void xs_udp_timer(struct rpc_task *task)
1125 xprt_adjust_cwnd(task, -ETIMEDOUT);
1128 static unsigned short xs_get_random_port(void)
1130 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1131 unsigned short rand = (unsigned short) net_random() % range;
1132 return rand + xprt_min_resvport;
1136 * xs_set_port - reset the port number in the remote endpoint address
1137 * @xprt: generic transport
1138 * @port: new port number
1141 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1143 struct sockaddr_in *sap = (struct sockaddr_in *) &xprt->addr;
1145 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1147 sap->sin_port = htons(port);
1150 static int xs_bind(struct sock_xprt *transport, struct socket *sock)
1152 struct sockaddr_in myaddr = {
1153 .sin_family = AF_INET,
1155 struct sockaddr_in *sa;
1157 unsigned short port = transport->port;
1159 if (!transport->xprt.resvport)
1161 sa = (struct sockaddr_in *)&transport->addr;
1162 myaddr.sin_addr = sa->sin_addr;
1164 myaddr.sin_port = htons(port);
1165 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1167 if (!transport->xprt.resvport)
1170 transport->port = port;
1173 if (port <= xprt_min_resvport)
1174 port = xprt_max_resvport;
1177 } while (err == -EADDRINUSE && port != transport->port);
1178 dprintk("RPC: xs_bind "NIPQUAD_FMT":%u: %s (%d)\n",
1179 NIPQUAD(myaddr.sin_addr), port, err ? "failed" : "ok", err);
1183 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1184 static struct lock_class_key xs_key[2];
1185 static struct lock_class_key xs_slock_key[2];
1187 static inline void xs_reclassify_socket(struct socket *sock)
1189 struct sock *sk = sock->sk;
1190 BUG_ON(sk->sk_lock.owner != NULL);
1191 switch (sk->sk_family) {
1193 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFS",
1194 &xs_slock_key[0], "sk_lock-AF_INET-NFS", &xs_key[0]);
1198 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFS",
1199 &xs_slock_key[1], "sk_lock-AF_INET6-NFS", &xs_key[1]);
1207 static inline void xs_reclassify_socket(struct socket *sock)
1213 * xs_udp_connect_worker - set up a UDP socket
1214 * @work: RPC transport to connect
1216 * Invoked by a work queue tasklet.
1218 static void xs_udp_connect_worker(struct work_struct *work)
1220 struct sock_xprt *transport =
1221 container_of(work, struct sock_xprt, connect_worker.work);
1222 struct rpc_xprt *xprt = &transport->xprt;
1223 struct socket *sock = transport->sock;
1224 int err, status = -EIO;
1226 if (xprt->shutdown || !xprt_bound(xprt))
1229 /* Start by resetting any existing state */
1232 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1233 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1236 xs_reclassify_socket(sock);
1238 if (xs_bind(transport, sock)) {
1243 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1244 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1246 if (!transport->inet) {
1247 struct sock *sk = sock->sk;
1249 write_lock_bh(&sk->sk_callback_lock);
1251 sk->sk_user_data = xprt;
1252 transport->old_data_ready = sk->sk_data_ready;
1253 transport->old_state_change = sk->sk_state_change;
1254 transport->old_write_space = sk->sk_write_space;
1255 sk->sk_data_ready = xs_udp_data_ready;
1256 sk->sk_write_space = xs_udp_write_space;
1257 sk->sk_no_check = UDP_CSUM_NORCV;
1258 sk->sk_allocation = GFP_ATOMIC;
1260 xprt_set_connected(xprt);
1262 /* Reset to new socket */
1263 transport->sock = sock;
1264 transport->inet = sk;
1266 write_unlock_bh(&sk->sk_callback_lock);
1268 xs_udp_do_set_buffer_size(xprt);
1271 xprt_wake_pending_tasks(xprt, status);
1272 xprt_clear_connecting(xprt);
1276 * We need to preserve the port number so the reply cache on the server can
1277 * find our cached RPC replies when we get around to reconnecting.
1279 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1282 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1283 struct sockaddr any;
1285 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1288 * Disconnect the transport socket by doing a connect operation
1289 * with AF_UNSPEC. This should return immediately...
1291 memset(&any, 0, sizeof(any));
1292 any.sa_family = AF_UNSPEC;
1293 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1295 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1300 * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint
1301 * @work: RPC transport to connect
1303 * Invoked by a work queue tasklet.
1305 static void xs_tcp_connect_worker(struct work_struct *work)
1307 struct sock_xprt *transport =
1308 container_of(work, struct sock_xprt, connect_worker.work);
1309 struct rpc_xprt *xprt = &transport->xprt;
1310 struct socket *sock = transport->sock;
1311 int err, status = -EIO;
1313 if (xprt->shutdown || !xprt_bound(xprt))
1317 /* start from scratch */
1318 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1319 dprintk("RPC: can't create TCP transport "
1320 "socket (%d).\n", -err);
1323 xs_reclassify_socket(sock);
1325 if (xs_bind(transport, sock)) {
1330 /* "close" the socket, preserving the local port */
1331 xs_tcp_reuse_connection(xprt);
1333 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1334 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1336 if (!transport->inet) {
1337 struct sock *sk = sock->sk;
1339 write_lock_bh(&sk->sk_callback_lock);
1341 sk->sk_user_data = xprt;
1342 transport->old_data_ready = sk->sk_data_ready;
1343 transport->old_state_change = sk->sk_state_change;
1344 transport->old_write_space = sk->sk_write_space;
1345 sk->sk_data_ready = xs_tcp_data_ready;
1346 sk->sk_state_change = xs_tcp_state_change;
1347 sk->sk_write_space = xs_tcp_write_space;
1348 sk->sk_allocation = GFP_ATOMIC;
1350 /* socket options */
1351 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1352 sock_reset_flag(sk, SOCK_LINGER);
1353 tcp_sk(sk)->linger2 = 0;
1354 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1356 xprt_clear_connected(xprt);
1358 /* Reset to new socket */
1359 transport->sock = sock;
1360 transport->inet = sk;
1362 write_unlock_bh(&sk->sk_callback_lock);
1365 /* Tell the socket layer to start connecting... */
1366 xprt->stat.connect_count++;
1367 xprt->stat.connect_start = jiffies;
1368 status = kernel_connect(sock, (struct sockaddr *) &xprt->addr,
1369 xprt->addrlen, O_NONBLOCK);
1370 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1371 xprt, -status, xprt_connected(xprt),
1372 sock->sk->sk_state);
1380 /* retry with existing socket, after a delay */
1383 /* get rid of existing socket, and retry */
1389 xprt_wake_pending_tasks(xprt, status);
1391 xprt_clear_connecting(xprt);
1395 * xs_connect - connect a socket to a remote endpoint
1396 * @task: address of RPC task that manages state of connect request
1398 * TCP: If the remote end dropped the connection, delay reconnecting.
1400 * UDP socket connects are synchronous, but we use a work queue anyway
1401 * to guarantee that even unprivileged user processes can set up a
1402 * socket on a privileged port.
1404 * If a UDP socket connect fails, the delay behavior here prevents
1405 * retry floods (hard mounts).
1407 static void xs_connect(struct rpc_task *task)
1409 struct rpc_xprt *xprt = task->tk_xprt;
1410 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1412 if (xprt_test_and_set_connecting(xprt))
1415 if (transport->sock != NULL) {
1416 dprintk("RPC: xs_connect delayed xprt %p for %lu "
1418 xprt, xprt->reestablish_timeout / HZ);
1419 queue_delayed_work(rpciod_workqueue,
1420 &transport->connect_worker,
1421 xprt->reestablish_timeout);
1422 xprt->reestablish_timeout <<= 1;
1423 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1424 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1426 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1427 queue_delayed_work(rpciod_workqueue,
1428 &transport->connect_worker, 0);
1433 * xs_udp_print_stats - display UDP socket-specifc stats
1434 * @xprt: rpc_xprt struct containing statistics
1438 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1440 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1442 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1444 xprt->stat.bind_count,
1447 xprt->stat.bad_xids,
1449 xprt->stat.bklog_u);
1453 * xs_tcp_print_stats - display TCP socket-specifc stats
1454 * @xprt: rpc_xprt struct containing statistics
1458 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1460 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1463 if (xprt_connected(xprt))
1464 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1466 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1468 xprt->stat.bind_count,
1469 xprt->stat.connect_count,
1470 xprt->stat.connect_time,
1474 xprt->stat.bad_xids,
1476 xprt->stat.bklog_u);
1479 static struct rpc_xprt_ops xs_udp_ops = {
1480 .set_buffer_size = xs_udp_set_buffer_size,
1481 .reserve_xprt = xprt_reserve_xprt_cong,
1482 .release_xprt = xprt_release_xprt_cong,
1483 .rpcbind = rpcb_getport_async,
1484 .set_port = xs_set_port,
1485 .connect = xs_connect,
1486 .buf_alloc = rpc_malloc,
1487 .buf_free = rpc_free,
1488 .send_request = xs_udp_send_request,
1489 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1490 .timer = xs_udp_timer,
1491 .release_request = xprt_release_rqst_cong,
1493 .destroy = xs_destroy,
1494 .print_stats = xs_udp_print_stats,
1497 static struct rpc_xprt_ops xs_tcp_ops = {
1498 .reserve_xprt = xprt_reserve_xprt,
1499 .release_xprt = xs_tcp_release_xprt,
1500 .rpcbind = rpcb_getport_async,
1501 .set_port = xs_set_port,
1502 .connect = xs_connect,
1503 .buf_alloc = rpc_malloc,
1504 .buf_free = rpc_free,
1505 .send_request = xs_tcp_send_request,
1506 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1508 .destroy = xs_destroy,
1509 .print_stats = xs_tcp_print_stats,
1512 static struct rpc_xprt *xs_setup_xprt(struct rpc_xprtsock_create *args, unsigned int slot_table_size)
1514 struct rpc_xprt *xprt;
1515 struct sock_xprt *new;
1517 if (args->addrlen > sizeof(xprt->addr)) {
1518 dprintk("RPC: xs_setup_xprt: address too large\n");
1519 return ERR_PTR(-EBADF);
1522 new = kzalloc(sizeof(*new), GFP_KERNEL);
1524 dprintk("RPC: xs_setup_xprt: couldn't allocate "
1526 return ERR_PTR(-ENOMEM);
1530 xprt->max_reqs = slot_table_size;
1531 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1532 if (xprt->slot == NULL) {
1534 dprintk("RPC: xs_setup_xprt: couldn't allocate slot "
1536 return ERR_PTR(-ENOMEM);
1539 memcpy(&xprt->addr, args->dstaddr, args->addrlen);
1540 xprt->addrlen = args->addrlen;
1542 memcpy(&new->addr, args->srcaddr, args->addrlen);
1543 new->port = xs_get_random_port();
1549 * xs_setup_udp - Set up transport to use a UDP socket
1550 * @args: rpc transport creation arguments
1553 struct rpc_xprt *xs_setup_udp(struct rpc_xprtsock_create *args)
1555 struct rpc_xprt *xprt;
1556 struct sock_xprt *transport;
1558 xprt = xs_setup_xprt(args, xprt_udp_slot_table_entries);
1561 transport = container_of(xprt, struct sock_xprt, xprt);
1563 if (ntohs(((struct sockaddr_in *)args->dstaddr)->sin_port) != 0)
1564 xprt_set_bound(xprt);
1566 xprt->prot = IPPROTO_UDP;
1568 /* XXX: header size can vary due to auth type, IPv6, etc. */
1569 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1571 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_connect_worker);
1572 xprt->bind_timeout = XS_BIND_TO;
1573 xprt->connect_timeout = XS_UDP_CONN_TO;
1574 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1575 xprt->idle_timeout = XS_IDLE_DISC_TO;
1577 xprt->ops = &xs_udp_ops;
1580 xprt->timeout = *args->timeout;
1582 xprt_set_timeout(&xprt->timeout, 5, 5 * HZ);
1584 xs_format_peer_addresses(xprt);
1585 dprintk("RPC: set up transport to address %s\n",
1586 xprt->address_strings[RPC_DISPLAY_ALL]);
1592 * xs_setup_tcp - Set up transport to use a TCP socket
1593 * @args: rpc transport creation arguments
1596 struct rpc_xprt *xs_setup_tcp(struct rpc_xprtsock_create *args)
1598 struct rpc_xprt *xprt;
1599 struct sock_xprt *transport;
1601 xprt = xs_setup_xprt(args, xprt_tcp_slot_table_entries);
1604 transport = container_of(xprt, struct sock_xprt, xprt);
1606 if (ntohs(((struct sockaddr_in *)args->dstaddr)->sin_port) != 0)
1607 xprt_set_bound(xprt);
1609 xprt->prot = IPPROTO_TCP;
1610 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
1611 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
1613 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker);
1614 xprt->bind_timeout = XS_BIND_TO;
1615 xprt->connect_timeout = XS_TCP_CONN_TO;
1616 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1617 xprt->idle_timeout = XS_IDLE_DISC_TO;
1619 xprt->ops = &xs_tcp_ops;
1622 xprt->timeout = *args->timeout;
1624 xprt_set_timeout(&xprt->timeout, 2, 60 * HZ);
1626 xs_format_peer_addresses(xprt);
1627 dprintk("RPC: set up transport to address %s\n",
1628 xprt->address_strings[RPC_DISPLAY_ALL]);
1634 * init_socket_xprt - set up xprtsock's sysctls
1637 int init_socket_xprt(void)
1640 if (!sunrpc_table_header)
1641 sunrpc_table_header = register_sysctl_table(sunrpc_table);
1648 * cleanup_socket_xprt - remove xprtsock's sysctls
1651 void cleanup_socket_xprt(void)
1654 if (sunrpc_table_header) {
1655 unregister_sysctl_table(sunrpc_table_header);
1656 sunrpc_table_header = NULL;