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/sched.h>
22 #include <linux/pagemap.h>
23 #include <linux/errno.h>
24 #include <linux/socket.h>
26 #include <linux/net.h>
28 #include <linux/udp.h>
29 #include <linux/tcp.h>
30 #include <linux/sunrpc/clnt.h>
31 #include <linux/sunrpc/sched.h>
32 #include <linux/file.h>
35 #include <net/checksum.h>
42 unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
43 unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
45 unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
46 unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
49 * We can register our own files under /proc/sys/sunrpc by
50 * calling register_sysctl_table() again. The files in that
51 * directory become the union of all files registered there.
53 * We simply need to make sure that we don't collide with
54 * someone else's file names!
59 static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
60 static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
61 static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
62 static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
64 static struct ctl_table_header *sunrpc_table_header;
67 * FIXME: changing the UDP slot table size should also resize the UDP
68 * socket buffers for existing UDP transports
70 static ctl_table xs_tunables_table[] = {
72 .ctl_name = CTL_SLOTTABLE_UDP,
73 .procname = "udp_slot_table_entries",
74 .data = &xprt_udp_slot_table_entries,
75 .maxlen = sizeof(unsigned int),
77 .proc_handler = &proc_dointvec_minmax,
78 .strategy = &sysctl_intvec,
79 .extra1 = &min_slot_table_size,
80 .extra2 = &max_slot_table_size
83 .ctl_name = CTL_SLOTTABLE_TCP,
84 .procname = "tcp_slot_table_entries",
85 .data = &xprt_tcp_slot_table_entries,
86 .maxlen = sizeof(unsigned int),
88 .proc_handler = &proc_dointvec_minmax,
89 .strategy = &sysctl_intvec,
90 .extra1 = &min_slot_table_size,
91 .extra2 = &max_slot_table_size
94 .ctl_name = CTL_MIN_RESVPORT,
95 .procname = "min_resvport",
96 .data = &xprt_min_resvport,
97 .maxlen = sizeof(unsigned int),
99 .proc_handler = &proc_dointvec_minmax,
100 .strategy = &sysctl_intvec,
101 .extra1 = &xprt_min_resvport_limit,
102 .extra2 = &xprt_max_resvport_limit
105 .ctl_name = CTL_MAX_RESVPORT,
106 .procname = "max_resvport",
107 .data = &xprt_max_resvport,
108 .maxlen = sizeof(unsigned int),
110 .proc_handler = &proc_dointvec_minmax,
111 .strategy = &sysctl_intvec,
112 .extra1 = &xprt_min_resvport_limit,
113 .extra2 = &xprt_max_resvport_limit
120 static ctl_table sunrpc_table[] = {
122 .ctl_name = CTL_SUNRPC,
123 .procname = "sunrpc",
125 .child = xs_tunables_table
135 * How many times to try sending a request on a socket before waiting
136 * for the socket buffer to clear.
138 #define XS_SENDMSG_RETRY (10U)
141 * Time out for an RPC UDP socket connect. UDP socket connects are
142 * synchronous, but we set a timeout anyway in case of resource
143 * exhaustion on the local host.
145 #define XS_UDP_CONN_TO (5U * HZ)
148 * Wait duration for an RPC TCP connection to be established. Solaris
149 * NFS over TCP uses 60 seconds, for example, which is in line with how
150 * long a server takes to reboot.
152 #define XS_TCP_CONN_TO (60U * HZ)
155 * Wait duration for a reply from the RPC portmapper.
157 #define XS_BIND_TO (60U * HZ)
160 * Delay if a UDP socket connect error occurs. This is most likely some
161 * kind of resource problem on the local host.
163 #define XS_UDP_REEST_TO (2U * HZ)
166 * The reestablish timeout allows clients to delay for a bit before attempting
167 * to reconnect to a server that just dropped our connection.
169 * We implement an exponential backoff when trying to reestablish a TCP
170 * transport connection with the server. Some servers like to drop a TCP
171 * connection when they are overworked, so we start with a short timeout and
172 * increase over time if the server is down or not responding.
174 #define XS_TCP_INIT_REEST_TO (3U * HZ)
175 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
178 * TCP idle timeout; client drops the transport socket if it is idle
179 * for this long. Note that we also timeout UDP sockets to prevent
180 * holding port numbers when there is no RPC traffic.
182 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
185 # undef RPC_DEBUG_DATA
186 # define RPCDBG_FACILITY RPCDBG_TRANS
189 #ifdef RPC_DEBUG_DATA
190 static void xs_pktdump(char *msg, u32 *packet, unsigned int count)
192 u8 *buf = (u8 *) packet;
195 dprintk("RPC: %s\n", msg);
196 for (j = 0; j < count && j < 128; j += 4) {
200 dprintk("0x%04x ", j);
202 dprintk("%02x%02x%02x%02x ",
203 buf[j], buf[j+1], buf[j+2], buf[j+3]);
208 static inline void xs_pktdump(char *msg, u32 *packet, unsigned int count)
215 struct rpc_xprt xprt;
220 struct socket * sock;
224 * State of TCP reply receive
232 unsigned long tcp_copied,
236 * Connection of transports
238 struct delayed_work connect_worker;
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, "%u.%u.%u.%u",
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=%u.%u.%u.%u 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: %4d 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;
526 int status, retry = 0;
528 xs_encode_tcp_record_marker(&req->rq_snd_buf);
530 xs_pktdump("packet data:",
531 req->rq_svec->iov_base,
532 req->rq_svec->iov_len);
534 /* Continue transmitting the packet/record. We must be careful
535 * to cope with writespace callbacks arriving _after_ we have
536 * called sendmsg(). */
538 req->rq_xtime = jiffies;
539 status = xs_sendpages(transport->sock,
540 NULL, 0, xdr, req->rq_bytes_sent);
542 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
543 xdr->len - req->rq_bytes_sent, status);
545 if (unlikely(status < 0))
548 /* If we've sent the entire packet, immediately
549 * reset the count of bytes sent. */
550 req->rq_bytes_sent += status;
551 task->tk_bytes_sent += status;
552 if (likely(req->rq_bytes_sent >= req->rq_slen)) {
553 req->rq_bytes_sent = 0;
558 if (retry++ > XS_SENDMSG_RETRY)
573 dprintk("RPC: sendmsg returned unrecognized error %d\n",
575 xprt_disconnect(xprt);
583 * xs_tcp_release_xprt - clean up after a tcp transmission
587 * This cleans up if an error causes us to abort the transmission of a request.
588 * In this case, the socket may need to be reset in order to avoid confusing
591 static void xs_tcp_release_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
593 struct rpc_rqst *req;
595 if (task != xprt->snd_task)
599 req = task->tk_rqstp;
600 if (req->rq_bytes_sent == 0)
602 if (req->rq_bytes_sent == req->rq_snd_buf.len)
604 set_bit(XPRT_CLOSE_WAIT, &task->tk_xprt->state);
606 xprt_release_xprt(xprt, task);
610 * xs_close - close a socket
613 * This is used when all requests are complete; ie, no DRC state remains
614 * on the server we want to save.
616 static void xs_close(struct rpc_xprt *xprt)
618 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
619 struct socket *sock = transport->sock;
620 struct sock *sk = transport->inet;
623 goto clear_close_wait;
625 dprintk("RPC: xs_close xprt %p\n", xprt);
627 write_lock_bh(&sk->sk_callback_lock);
628 transport->inet = NULL;
629 transport->sock = NULL;
631 sk->sk_user_data = NULL;
632 sk->sk_data_ready = transport->old_data_ready;
633 sk->sk_state_change = transport->old_state_change;
634 sk->sk_write_space = transport->old_write_space;
635 write_unlock_bh(&sk->sk_callback_lock);
641 smp_mb__before_clear_bit();
642 clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
643 smp_mb__after_clear_bit();
647 * xs_destroy - prepare to shutdown a transport
648 * @xprt: doomed transport
651 static void xs_destroy(struct rpc_xprt *xprt)
653 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
655 dprintk("RPC: xs_destroy xprt %p\n", xprt);
657 cancel_delayed_work(&transport->connect_worker);
658 flush_scheduled_work();
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, tcp_offset = %u, tcp_reclen = %u\n",
859 xprt, transport->tcp_copied, transport->tcp_offset,
860 transport->tcp_reclen);
864 dprintk("RPC: XID %08x read %Zd bytes\n",
865 ntohl(transport->tcp_xid), r);
866 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, tcp_reclen = %u\n",
867 xprt, transport->tcp_copied, transport->tcp_offset,
868 transport->tcp_reclen);
870 if (transport->tcp_copied == req->rq_private_buf.buflen)
871 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
872 else if (transport->tcp_offset == transport->tcp_reclen) {
873 if (transport->tcp_flags & TCP_RCV_LAST_FRAG)
874 transport->tcp_flags &= ~TCP_RCV_COPY_DATA;
878 if (!(transport->tcp_flags & TCP_RCV_COPY_DATA))
879 xprt_complete_rqst(req->rq_task, transport->tcp_copied);
880 spin_unlock(&xprt->transport_lock);
881 xs_tcp_check_fraghdr(transport);
884 static inline void xs_tcp_read_discard(struct sock_xprt *transport, struct xdr_skb_reader *desc)
888 len = transport->tcp_reclen - transport->tcp_offset;
889 if (len > desc->count)
893 transport->tcp_offset += len;
894 dprintk("RPC: discarded %Zu bytes\n", len);
895 xs_tcp_check_fraghdr(transport);
898 static int xs_tcp_data_recv(read_descriptor_t *rd_desc, struct sk_buff *skb, unsigned int offset, size_t len)
900 struct rpc_xprt *xprt = rd_desc->arg.data;
901 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
902 struct xdr_skb_reader desc = {
908 dprintk("RPC: xs_tcp_data_recv started\n");
910 /* Read in a new fragment marker if necessary */
911 /* Can we ever really expect to get completely empty fragments? */
912 if (transport->tcp_flags & TCP_RCV_COPY_FRAGHDR) {
913 xs_tcp_read_fraghdr(xprt, &desc);
916 /* Read in the xid if necessary */
917 if (transport->tcp_flags & TCP_RCV_COPY_XID) {
918 xs_tcp_read_xid(transport, &desc);
921 /* Read in the request data */
922 if (transport->tcp_flags & TCP_RCV_COPY_DATA) {
923 xs_tcp_read_request(xprt, &desc);
926 /* Skip over any trailing bytes on short reads */
927 xs_tcp_read_discard(transport, &desc);
928 } while (desc.count);
929 dprintk("RPC: xs_tcp_data_recv done\n");
930 return len - desc.count;
934 * xs_tcp_data_ready - "data ready" callback for TCP sockets
935 * @sk: socket with data to read
936 * @bytes: how much data to read
939 static void xs_tcp_data_ready(struct sock *sk, int bytes)
941 struct rpc_xprt *xprt;
942 read_descriptor_t rd_desc;
944 read_lock(&sk->sk_callback_lock);
945 dprintk("RPC: xs_tcp_data_ready...\n");
946 if (!(xprt = xprt_from_sock(sk)))
951 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
952 rd_desc.arg.data = xprt;
953 rd_desc.count = 65536;
954 tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv);
956 read_unlock(&sk->sk_callback_lock);
960 * xs_tcp_state_change - callback to handle TCP socket state changes
961 * @sk: socket whose state has changed
964 static void xs_tcp_state_change(struct sock *sk)
966 struct rpc_xprt *xprt;
968 read_lock(&sk->sk_callback_lock);
969 if (!(xprt = xprt_from_sock(sk)))
971 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt);
972 dprintk("RPC: state %x conn %d dead %d zapped %d\n",
973 sk->sk_state, xprt_connected(xprt),
974 sock_flag(sk, SOCK_DEAD),
975 sock_flag(sk, SOCK_ZAPPED));
977 switch (sk->sk_state) {
978 case TCP_ESTABLISHED:
979 spin_lock_bh(&xprt->transport_lock);
980 if (!xprt_test_and_set_connected(xprt)) {
981 struct sock_xprt *transport = container_of(xprt,
982 struct sock_xprt, xprt);
984 /* Reset TCP record info */
985 transport->tcp_offset = 0;
986 transport->tcp_reclen = 0;
987 transport->tcp_copied = 0;
988 transport->tcp_flags =
989 TCP_RCV_COPY_FRAGHDR | TCP_RCV_COPY_XID;
991 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
992 xprt_wake_pending_tasks(xprt, 0);
994 spin_unlock_bh(&xprt->transport_lock);
1000 /* Try to schedule an autoclose RPC calls */
1001 set_bit(XPRT_CLOSE_WAIT, &xprt->state);
1002 if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0)
1003 schedule_work(&xprt->task_cleanup);
1005 xprt_disconnect(xprt);
1008 read_unlock(&sk->sk_callback_lock);
1012 * xs_udp_write_space - callback invoked when socket buffer space
1014 * @sk: socket whose state has changed
1016 * Called when more output buffer space is available for this socket.
1017 * We try not to wake our writers until they can make "significant"
1018 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1019 * with a bunch of small requests.
1021 static void xs_udp_write_space(struct sock *sk)
1023 read_lock(&sk->sk_callback_lock);
1025 /* from net/core/sock.c:sock_def_write_space */
1026 if (sock_writeable(sk)) {
1027 struct socket *sock;
1028 struct rpc_xprt *xprt;
1030 if (unlikely(!(sock = sk->sk_socket)))
1032 if (unlikely(!(xprt = xprt_from_sock(sk))))
1034 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1037 xprt_write_space(xprt);
1041 read_unlock(&sk->sk_callback_lock);
1045 * xs_tcp_write_space - callback invoked when socket buffer space
1047 * @sk: socket whose state has changed
1049 * Called when more output buffer space is available for this socket.
1050 * We try not to wake our writers until they can make "significant"
1051 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1052 * with a bunch of small requests.
1054 static void xs_tcp_write_space(struct sock *sk)
1056 read_lock(&sk->sk_callback_lock);
1058 /* from net/core/stream.c:sk_stream_write_space */
1059 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
1060 struct socket *sock;
1061 struct rpc_xprt *xprt;
1063 if (unlikely(!(sock = sk->sk_socket)))
1065 if (unlikely(!(xprt = xprt_from_sock(sk))))
1067 if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags)))
1070 xprt_write_space(xprt);
1074 read_unlock(&sk->sk_callback_lock);
1077 static void xs_udp_do_set_buffer_size(struct rpc_xprt *xprt)
1079 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1080 struct sock *sk = transport->inet;
1082 if (transport->rcvsize) {
1083 sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
1084 sk->sk_rcvbuf = transport->rcvsize * xprt->max_reqs * 2;
1086 if (transport->sndsize) {
1087 sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
1088 sk->sk_sndbuf = transport->sndsize * xprt->max_reqs * 2;
1089 sk->sk_write_space(sk);
1094 * xs_udp_set_buffer_size - set send and receive limits
1095 * @xprt: generic transport
1096 * @sndsize: requested size of send buffer, in bytes
1097 * @rcvsize: requested size of receive buffer, in bytes
1099 * Set socket send and receive buffer size limits.
1101 static void xs_udp_set_buffer_size(struct rpc_xprt *xprt, size_t sndsize, size_t rcvsize)
1103 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1105 transport->sndsize = 0;
1107 transport->sndsize = sndsize + 1024;
1108 transport->rcvsize = 0;
1110 transport->rcvsize = rcvsize + 1024;
1112 xs_udp_do_set_buffer_size(xprt);
1116 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1117 * @task: task that timed out
1119 * Adjust the congestion window after a retransmit timeout has occurred.
1121 static void xs_udp_timer(struct rpc_task *task)
1123 xprt_adjust_cwnd(task, -ETIMEDOUT);
1126 static unsigned short xs_get_random_port(void)
1128 unsigned short range = xprt_max_resvport - xprt_min_resvport;
1129 unsigned short rand = (unsigned short) net_random() % range;
1130 return rand + xprt_min_resvport;
1134 * xs_set_port - reset the port number in the remote endpoint address
1135 * @xprt: generic transport
1136 * @port: new port number
1139 static void xs_set_port(struct rpc_xprt *xprt, unsigned short port)
1141 struct sockaddr_in *sap = (struct sockaddr_in *) &xprt->addr;
1143 dprintk("RPC: setting port for xprt %p to %u\n", xprt, port);
1145 sap->sin_port = htons(port);
1148 static int xs_bindresvport(struct sock_xprt *transport, struct socket *sock)
1150 struct sockaddr_in myaddr = {
1151 .sin_family = AF_INET,
1154 unsigned short port = transport->port;
1157 myaddr.sin_port = htons(port);
1158 err = kernel_bind(sock, (struct sockaddr *) &myaddr,
1161 transport->port = port;
1162 dprintk("RPC: xs_bindresvport bound to port %u\n",
1166 if (port <= xprt_min_resvport)
1167 port = xprt_max_resvport;
1170 } while (err == -EADDRINUSE && port != transport->port);
1172 dprintk("RPC: can't bind to reserved port (%d).\n", -err);
1176 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1177 static struct lock_class_key xs_key[2];
1178 static struct lock_class_key xs_slock_key[2];
1180 static inline void xs_reclassify_socket(struct socket *sock)
1182 struct sock *sk = sock->sk;
1183 BUG_ON(sk->sk_lock.owner != NULL);
1184 switch (sk->sk_family) {
1186 sock_lock_init_class_and_name(sk, "slock-AF_INET-NFS",
1187 &xs_slock_key[0], "sk_lock-AF_INET-NFS", &xs_key[0]);
1191 sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFS",
1192 &xs_slock_key[1], "sk_lock-AF_INET6-NFS", &xs_key[1]);
1200 static inline void xs_reclassify_socket(struct socket *sock)
1206 * xs_udp_connect_worker - set up a UDP socket
1207 * @work: RPC transport to connect
1209 * Invoked by a work queue tasklet.
1211 static void xs_udp_connect_worker(struct work_struct *work)
1213 struct sock_xprt *transport =
1214 container_of(work, struct sock_xprt, connect_worker.work);
1215 struct rpc_xprt *xprt = &transport->xprt;
1216 struct socket *sock = transport->sock;
1217 int err, status = -EIO;
1219 if (xprt->shutdown || !xprt_bound(xprt))
1222 /* Start by resetting any existing state */
1225 if ((err = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock)) < 0) {
1226 dprintk("RPC: can't create UDP transport socket (%d).\n", -err);
1229 xs_reclassify_socket(sock);
1231 if (xprt->resvport && xs_bindresvport(transport, sock) < 0) {
1236 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1237 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1239 if (!transport->inet) {
1240 struct sock *sk = sock->sk;
1242 write_lock_bh(&sk->sk_callback_lock);
1244 sk->sk_user_data = xprt;
1245 transport->old_data_ready = sk->sk_data_ready;
1246 transport->old_state_change = sk->sk_state_change;
1247 transport->old_write_space = sk->sk_write_space;
1248 sk->sk_data_ready = xs_udp_data_ready;
1249 sk->sk_write_space = xs_udp_write_space;
1250 sk->sk_no_check = UDP_CSUM_NORCV;
1251 sk->sk_allocation = GFP_ATOMIC;
1253 xprt_set_connected(xprt);
1255 /* Reset to new socket */
1256 transport->sock = sock;
1257 transport->inet = sk;
1259 write_unlock_bh(&sk->sk_callback_lock);
1261 xs_udp_do_set_buffer_size(xprt);
1264 xprt_wake_pending_tasks(xprt, status);
1265 xprt_clear_connecting(xprt);
1269 * We need to preserve the port number so the reply cache on the server can
1270 * find our cached RPC replies when we get around to reconnecting.
1272 static void xs_tcp_reuse_connection(struct rpc_xprt *xprt)
1275 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1276 struct sockaddr any;
1278 dprintk("RPC: disconnecting xprt %p to reuse port\n", xprt);
1281 * Disconnect the transport socket by doing a connect operation
1282 * with AF_UNSPEC. This should return immediately...
1284 memset(&any, 0, sizeof(any));
1285 any.sa_family = AF_UNSPEC;
1286 result = kernel_connect(transport->sock, &any, sizeof(any), 0);
1288 dprintk("RPC: AF_UNSPEC connect return code %d\n",
1293 * xs_tcp_connect_worker - connect a TCP socket to a remote endpoint
1294 * @work: RPC transport to connect
1296 * Invoked by a work queue tasklet.
1298 static void xs_tcp_connect_worker(struct work_struct *work)
1300 struct sock_xprt *transport =
1301 container_of(work, struct sock_xprt, connect_worker.work);
1302 struct rpc_xprt *xprt = &transport->xprt;
1303 struct socket *sock = transport->sock;
1304 int err, status = -EIO;
1306 if (xprt->shutdown || !xprt_bound(xprt))
1310 /* start from scratch */
1311 if ((err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock)) < 0) {
1312 dprintk("RPC: can't create TCP transport socket (%d).\n", -err);
1315 xs_reclassify_socket(sock);
1317 if (xprt->resvport && xs_bindresvport(transport, sock) < 0) {
1322 /* "close" the socket, preserving the local port */
1323 xs_tcp_reuse_connection(xprt);
1325 dprintk("RPC: worker connecting xprt %p to address: %s\n",
1326 xprt, xprt->address_strings[RPC_DISPLAY_ALL]);
1328 if (!transport->inet) {
1329 struct sock *sk = sock->sk;
1331 write_lock_bh(&sk->sk_callback_lock);
1333 sk->sk_user_data = xprt;
1334 transport->old_data_ready = sk->sk_data_ready;
1335 transport->old_state_change = sk->sk_state_change;
1336 transport->old_write_space = sk->sk_write_space;
1337 sk->sk_data_ready = xs_tcp_data_ready;
1338 sk->sk_state_change = xs_tcp_state_change;
1339 sk->sk_write_space = xs_tcp_write_space;
1340 sk->sk_allocation = GFP_ATOMIC;
1342 /* socket options */
1343 sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
1344 sock_reset_flag(sk, SOCK_LINGER);
1345 tcp_sk(sk)->linger2 = 0;
1346 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1348 xprt_clear_connected(xprt);
1350 /* Reset to new socket */
1351 transport->sock = sock;
1352 transport->inet = sk;
1354 write_unlock_bh(&sk->sk_callback_lock);
1357 /* Tell the socket layer to start connecting... */
1358 xprt->stat.connect_count++;
1359 xprt->stat.connect_start = jiffies;
1360 status = kernel_connect(sock, (struct sockaddr *) &xprt->addr,
1361 xprt->addrlen, O_NONBLOCK);
1362 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
1363 xprt, -status, xprt_connected(xprt), sock->sk->sk_state);
1371 /* retry with existing socket, after a delay */
1374 /* get rid of existing socket, and retry */
1380 xprt_wake_pending_tasks(xprt, status);
1382 xprt_clear_connecting(xprt);
1386 * xs_connect - connect a socket to a remote endpoint
1387 * @task: address of RPC task that manages state of connect request
1389 * TCP: If the remote end dropped the connection, delay reconnecting.
1391 * UDP socket connects are synchronous, but we use a work queue anyway
1392 * to guarantee that even unprivileged user processes can set up a
1393 * socket on a privileged port.
1395 * If a UDP socket connect fails, the delay behavior here prevents
1396 * retry floods (hard mounts).
1398 static void xs_connect(struct rpc_task *task)
1400 struct rpc_xprt *xprt = task->tk_xprt;
1401 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1403 if (xprt_test_and_set_connecting(xprt))
1406 if (transport->sock != NULL) {
1407 dprintk("RPC: xs_connect delayed xprt %p for %lu seconds\n",
1408 xprt, xprt->reestablish_timeout / HZ);
1409 schedule_delayed_work(&transport->connect_worker,
1410 xprt->reestablish_timeout);
1411 xprt->reestablish_timeout <<= 1;
1412 if (xprt->reestablish_timeout > XS_TCP_MAX_REEST_TO)
1413 xprt->reestablish_timeout = XS_TCP_MAX_REEST_TO;
1415 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt);
1416 schedule_delayed_work(&transport->connect_worker, 0);
1418 /* flush_scheduled_work can sleep... */
1419 if (!RPC_IS_ASYNC(task))
1420 flush_scheduled_work();
1425 * xs_udp_print_stats - display UDP socket-specifc stats
1426 * @xprt: rpc_xprt struct containing statistics
1430 static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1432 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1434 seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
1436 xprt->stat.bind_count,
1439 xprt->stat.bad_xids,
1441 xprt->stat.bklog_u);
1445 * xs_tcp_print_stats - display TCP socket-specifc stats
1446 * @xprt: rpc_xprt struct containing statistics
1450 static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
1452 struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
1455 if (xprt_connected(xprt))
1456 idle_time = (long)(jiffies - xprt->last_used) / HZ;
1458 seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
1460 xprt->stat.bind_count,
1461 xprt->stat.connect_count,
1462 xprt->stat.connect_time,
1466 xprt->stat.bad_xids,
1468 xprt->stat.bklog_u);
1471 static struct rpc_xprt_ops xs_udp_ops = {
1472 .set_buffer_size = xs_udp_set_buffer_size,
1473 .reserve_xprt = xprt_reserve_xprt_cong,
1474 .release_xprt = xprt_release_xprt_cong,
1475 .rpcbind = rpc_getport,
1476 .set_port = xs_set_port,
1477 .connect = xs_connect,
1478 .buf_alloc = rpc_malloc,
1479 .buf_free = rpc_free,
1480 .send_request = xs_udp_send_request,
1481 .set_retrans_timeout = xprt_set_retrans_timeout_rtt,
1482 .timer = xs_udp_timer,
1483 .release_request = xprt_release_rqst_cong,
1485 .destroy = xs_destroy,
1486 .print_stats = xs_udp_print_stats,
1489 static struct rpc_xprt_ops xs_tcp_ops = {
1490 .reserve_xprt = xprt_reserve_xprt,
1491 .release_xprt = xs_tcp_release_xprt,
1492 .rpcbind = rpc_getport,
1493 .set_port = xs_set_port,
1494 .connect = xs_connect,
1495 .buf_alloc = rpc_malloc,
1496 .buf_free = rpc_free,
1497 .send_request = xs_tcp_send_request,
1498 .set_retrans_timeout = xprt_set_retrans_timeout_def,
1500 .destroy = xs_destroy,
1501 .print_stats = xs_tcp_print_stats,
1504 static struct rpc_xprt *xs_setup_xprt(struct sockaddr *addr, size_t addrlen, unsigned int slot_table_size)
1506 struct rpc_xprt *xprt;
1507 struct sock_xprt *new;
1509 if (addrlen > sizeof(xprt->addr)) {
1510 dprintk("RPC: xs_setup_xprt: address too large\n");
1511 return ERR_PTR(-EBADF);
1514 new = kzalloc(sizeof(*new), GFP_KERNEL);
1516 dprintk("RPC: xs_setup_xprt: couldn't allocate rpc_xprt\n");
1517 return ERR_PTR(-ENOMEM);
1521 xprt->max_reqs = slot_table_size;
1522 xprt->slot = kcalloc(xprt->max_reqs, sizeof(struct rpc_rqst), GFP_KERNEL);
1523 if (xprt->slot == NULL) {
1525 dprintk("RPC: xs_setup_xprt: couldn't allocate slot table\n");
1526 return ERR_PTR(-ENOMEM);
1529 memcpy(&xprt->addr, addr, addrlen);
1530 xprt->addrlen = addrlen;
1531 new->port = xs_get_random_port();
1537 * xs_setup_udp - Set up transport to use a UDP socket
1538 * @addr: address of remote server
1539 * @addrlen: length of address in bytes
1540 * @to: timeout parameters
1543 struct rpc_xprt *xs_setup_udp(struct sockaddr *addr, size_t addrlen, struct rpc_timeout *to)
1545 struct rpc_xprt *xprt;
1546 struct sock_xprt *transport;
1548 xprt = xs_setup_xprt(addr, addrlen, xprt_udp_slot_table_entries);
1551 transport = container_of(xprt, struct sock_xprt, xprt);
1553 if (ntohs(((struct sockaddr_in *)addr)->sin_port) != 0)
1554 xprt_set_bound(xprt);
1556 xprt->prot = IPPROTO_UDP;
1558 /* XXX: header size can vary due to auth type, IPv6, etc. */
1559 xprt->max_payload = (1U << 16) - (MAX_HEADER << 3);
1561 INIT_DELAYED_WORK(&transport->connect_worker, xs_udp_connect_worker);
1562 xprt->bind_timeout = XS_BIND_TO;
1563 xprt->connect_timeout = XS_UDP_CONN_TO;
1564 xprt->reestablish_timeout = XS_UDP_REEST_TO;
1565 xprt->idle_timeout = XS_IDLE_DISC_TO;
1567 xprt->ops = &xs_udp_ops;
1570 xprt->timeout = *to;
1572 xprt_set_timeout(&xprt->timeout, 5, 5 * HZ);
1574 xs_format_peer_addresses(xprt);
1575 dprintk("RPC: set up transport to address %s\n",
1576 xprt->address_strings[RPC_DISPLAY_ALL]);
1582 * xs_setup_tcp - Set up transport to use a TCP socket
1583 * @addr: address of remote server
1584 * @addrlen: length of address in bytes
1585 * @to: timeout parameters
1588 struct rpc_xprt *xs_setup_tcp(struct sockaddr *addr, size_t addrlen, struct rpc_timeout *to)
1590 struct rpc_xprt *xprt;
1591 struct sock_xprt *transport;
1593 xprt = xs_setup_xprt(addr, addrlen, xprt_tcp_slot_table_entries);
1596 transport = container_of(xprt, struct sock_xprt, xprt);
1598 if (ntohs(((struct sockaddr_in *)addr)->sin_port) != 0)
1599 xprt_set_bound(xprt);
1601 xprt->prot = IPPROTO_TCP;
1602 xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
1603 xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;
1605 INIT_DELAYED_WORK(&transport->connect_worker, xs_tcp_connect_worker);
1606 xprt->bind_timeout = XS_BIND_TO;
1607 xprt->connect_timeout = XS_TCP_CONN_TO;
1608 xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
1609 xprt->idle_timeout = XS_IDLE_DISC_TO;
1611 xprt->ops = &xs_tcp_ops;
1614 xprt->timeout = *to;
1616 xprt_set_timeout(&xprt->timeout, 2, 60 * HZ);
1618 xs_format_peer_addresses(xprt);
1619 dprintk("RPC: set up transport to address %s\n",
1620 xprt->address_strings[RPC_DISPLAY_ALL]);
1626 * init_socket_xprt - set up xprtsock's sysctls
1629 int init_socket_xprt(void)
1632 if (!sunrpc_table_header) {
1633 sunrpc_table_header = register_sysctl_table(sunrpc_table, 1);
1634 #ifdef CONFIG_PROC_FS
1635 if (sunrpc_table[0].de)
1636 sunrpc_table[0].de->owner = THIS_MODULE;
1645 * cleanup_socket_xprt - remove xprtsock's sysctls
1648 void cleanup_socket_xprt(void)
1651 if (sunrpc_table_header) {
1652 unregister_sysctl_table(sunrpc_table_header);
1653 sunrpc_table_header = NULL;