2 * linux/net/sunrpc/xprtsock.c
4 * Client-side transport implementation for sockets.
6 * TCP callback races fixes (C) 1998 Red Hat
7 * TCP send fixes (C) 1998 Red Hat
8 * TCP NFS related read + write fixes
9 * (C) 1999 Dave Airlie, University of Limerick, Ireland <airlied@linux.ie>
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>
17 * IPv6 support contributed by Gilles Quillard, Bull Open Source, 2005.
18 * <gilles.quillard@bull.net>
21 #include <linux/types.h>
22 #include <linux/string.h>
23 #include <linux/slab.h>
24 #include <linux/module.h>
25 #include <linux/capability.h>
26 #include <linux/pagemap.h>
27 #include <linux/errno.h>
28 #include <linux/socket.h>
30 #include <linux/net.h>
33 #include <linux/udp.h>
34 #include <linux/tcp.h>
35 #include <linux/sunrpc/clnt.h>
36 #include <linux/sunrpc/addr.h>
37 #include <linux/sunrpc/sched.h>
38 #include <linux/sunrpc/svcsock.h>
39 #include <linux/sunrpc/xprtsock.h>
40 #include <linux/file.h>
41 #ifdef CONFIG_SUNRPC_BACKCHANNEL
42 #include <linux/sunrpc/bc_xprt.h>
46 #include <net/checksum.h>
50 #include <trace/events/sunrpc.h>
54 static void xs_close(struct rpc_xprt
*xprt
);
59 static unsigned int xprt_udp_slot_table_entries
= RPC_DEF_SLOT_TABLE
;
60 static unsigned int xprt_tcp_slot_table_entries
= RPC_MIN_SLOT_TABLE
;
61 static unsigned int xprt_max_tcp_slot_table_entries
= RPC_MAX_SLOT_TABLE
;
63 static unsigned int xprt_min_resvport
= RPC_DEF_MIN_RESVPORT
;
64 static unsigned int xprt_max_resvport
= RPC_DEF_MAX_RESVPORT
;
66 #define XS_TCP_LINGER_TO (15U * HZ)
67 static unsigned int xs_tcp_fin_timeout __read_mostly
= XS_TCP_LINGER_TO
;
70 * We can register our own files under /proc/sys/sunrpc by
71 * calling register_sysctl_table() again. The files in that
72 * directory become the union of all files registered there.
74 * We simply need to make sure that we don't collide with
75 * someone else's file names!
80 static unsigned int min_slot_table_size
= RPC_MIN_SLOT_TABLE
;
81 static unsigned int max_slot_table_size
= RPC_MAX_SLOT_TABLE
;
82 static unsigned int max_tcp_slot_table_limit
= RPC_MAX_SLOT_TABLE_LIMIT
;
83 static unsigned int xprt_min_resvport_limit
= RPC_MIN_RESVPORT
;
84 static unsigned int xprt_max_resvport_limit
= RPC_MAX_RESVPORT
;
86 static struct ctl_table_header
*sunrpc_table_header
;
89 * FIXME: changing the UDP slot table size should also resize the UDP
90 * socket buffers for existing UDP transports
92 static struct ctl_table xs_tunables_table
[] = {
94 .procname
= "udp_slot_table_entries",
95 .data
= &xprt_udp_slot_table_entries
,
96 .maxlen
= sizeof(unsigned int),
98 .proc_handler
= proc_dointvec_minmax
,
99 .extra1
= &min_slot_table_size
,
100 .extra2
= &max_slot_table_size
103 .procname
= "tcp_slot_table_entries",
104 .data
= &xprt_tcp_slot_table_entries
,
105 .maxlen
= sizeof(unsigned int),
107 .proc_handler
= proc_dointvec_minmax
,
108 .extra1
= &min_slot_table_size
,
109 .extra2
= &max_slot_table_size
112 .procname
= "tcp_max_slot_table_entries",
113 .data
= &xprt_max_tcp_slot_table_entries
,
114 .maxlen
= sizeof(unsigned int),
116 .proc_handler
= proc_dointvec_minmax
,
117 .extra1
= &min_slot_table_size
,
118 .extra2
= &max_tcp_slot_table_limit
121 .procname
= "min_resvport",
122 .data
= &xprt_min_resvport
,
123 .maxlen
= sizeof(unsigned int),
125 .proc_handler
= proc_dointvec_minmax
,
126 .extra1
= &xprt_min_resvport_limit
,
127 .extra2
= &xprt_max_resvport_limit
130 .procname
= "max_resvport",
131 .data
= &xprt_max_resvport
,
132 .maxlen
= sizeof(unsigned int),
134 .proc_handler
= proc_dointvec_minmax
,
135 .extra1
= &xprt_min_resvport_limit
,
136 .extra2
= &xprt_max_resvport_limit
139 .procname
= "tcp_fin_timeout",
140 .data
= &xs_tcp_fin_timeout
,
141 .maxlen
= sizeof(xs_tcp_fin_timeout
),
143 .proc_handler
= proc_dointvec_jiffies
,
148 static struct ctl_table sunrpc_table
[] = {
150 .procname
= "sunrpc",
152 .child
= xs_tunables_table
160 * Wait duration for a reply from the RPC portmapper.
162 #define XS_BIND_TO (60U * HZ)
165 * Delay if a UDP socket connect error occurs. This is most likely some
166 * kind of resource problem on the local host.
168 #define XS_UDP_REEST_TO (2U * HZ)
171 * The reestablish timeout allows clients to delay for a bit before attempting
172 * to reconnect to a server that just dropped our connection.
174 * We implement an exponential backoff when trying to reestablish a TCP
175 * transport connection with the server. Some servers like to drop a TCP
176 * connection when they are overworked, so we start with a short timeout and
177 * increase over time if the server is down or not responding.
179 #define XS_TCP_INIT_REEST_TO (3U * HZ)
180 #define XS_TCP_MAX_REEST_TO (5U * 60 * HZ)
183 * TCP idle timeout; client drops the transport socket if it is idle
184 * for this long. Note that we also timeout UDP sockets to prevent
185 * holding port numbers when there is no RPC traffic.
187 #define XS_IDLE_DISC_TO (5U * 60 * HZ)
190 # undef RPC_DEBUG_DATA
191 # define RPCDBG_FACILITY RPCDBG_TRANS
194 #ifdef RPC_DEBUG_DATA
195 static void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
197 u8
*buf
= (u8
*) packet
;
200 dprintk("RPC: %s\n", msg
);
201 for (j
= 0; j
< count
&& j
< 128; j
+= 4) {
205 dprintk("0x%04x ", j
);
207 dprintk("%02x%02x%02x%02x ",
208 buf
[j
], buf
[j
+1], buf
[j
+2], buf
[j
+3]);
213 static inline void xs_pktdump(char *msg
, u32
*packet
, unsigned int count
)
220 struct rpc_xprt xprt
;
225 struct socket
* sock
;
229 * State of TCP reply receive
238 unsigned long tcp_copied
,
242 * Connection of transports
244 struct delayed_work connect_worker
;
245 struct sockaddr_storage srcaddr
;
246 unsigned short srcport
;
249 * UDP socket buffer size parameters
255 * Saved socket callback addresses
257 void (*old_data_ready
)(struct sock
*);
258 void (*old_state_change
)(struct sock
*);
259 void (*old_write_space
)(struct sock
*);
260 void (*old_error_report
)(struct sock
*);
264 * TCP receive state flags
266 #define TCP_RCV_LAST_FRAG (1UL << 0)
267 #define TCP_RCV_COPY_FRAGHDR (1UL << 1)
268 #define TCP_RCV_COPY_XID (1UL << 2)
269 #define TCP_RCV_COPY_DATA (1UL << 3)
270 #define TCP_RCV_READ_CALLDIR (1UL << 4)
271 #define TCP_RCV_COPY_CALLDIR (1UL << 5)
276 #define TCP_RPC_REPLY (1UL << 6)
278 static inline struct rpc_xprt
*xprt_from_sock(struct sock
*sk
)
280 return (struct rpc_xprt
*) sk
->sk_user_data
;
283 static inline struct sockaddr
*xs_addr(struct rpc_xprt
*xprt
)
285 return (struct sockaddr
*) &xprt
->addr
;
288 static inline struct sockaddr_un
*xs_addr_un(struct rpc_xprt
*xprt
)
290 return (struct sockaddr_un
*) &xprt
->addr
;
293 static inline struct sockaddr_in
*xs_addr_in(struct rpc_xprt
*xprt
)
295 return (struct sockaddr_in
*) &xprt
->addr
;
298 static inline struct sockaddr_in6
*xs_addr_in6(struct rpc_xprt
*xprt
)
300 return (struct sockaddr_in6
*) &xprt
->addr
;
303 static void xs_format_common_peer_addresses(struct rpc_xprt
*xprt
)
305 struct sockaddr
*sap
= xs_addr(xprt
);
306 struct sockaddr_in6
*sin6
;
307 struct sockaddr_in
*sin
;
308 struct sockaddr_un
*sun
;
311 switch (sap
->sa_family
) {
313 sun
= xs_addr_un(xprt
);
314 strlcpy(buf
, sun
->sun_path
, sizeof(buf
));
315 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
316 kstrdup(buf
, GFP_KERNEL
);
319 (void)rpc_ntop(sap
, buf
, sizeof(buf
));
320 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
321 kstrdup(buf
, GFP_KERNEL
);
322 sin
= xs_addr_in(xprt
);
323 snprintf(buf
, sizeof(buf
), "%08x", ntohl(sin
->sin_addr
.s_addr
));
326 (void)rpc_ntop(sap
, buf
, sizeof(buf
));
327 xprt
->address_strings
[RPC_DISPLAY_ADDR
] =
328 kstrdup(buf
, GFP_KERNEL
);
329 sin6
= xs_addr_in6(xprt
);
330 snprintf(buf
, sizeof(buf
), "%pi6", &sin6
->sin6_addr
);
336 xprt
->address_strings
[RPC_DISPLAY_HEX_ADDR
] = kstrdup(buf
, GFP_KERNEL
);
339 static void xs_format_common_peer_ports(struct rpc_xprt
*xprt
)
341 struct sockaddr
*sap
= xs_addr(xprt
);
344 snprintf(buf
, sizeof(buf
), "%u", rpc_get_port(sap
));
345 xprt
->address_strings
[RPC_DISPLAY_PORT
] = kstrdup(buf
, GFP_KERNEL
);
347 snprintf(buf
, sizeof(buf
), "%4hx", rpc_get_port(sap
));
348 xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
] = kstrdup(buf
, GFP_KERNEL
);
351 static void xs_format_peer_addresses(struct rpc_xprt
*xprt
,
352 const char *protocol
,
355 xprt
->address_strings
[RPC_DISPLAY_PROTO
] = protocol
;
356 xprt
->address_strings
[RPC_DISPLAY_NETID
] = netid
;
357 xs_format_common_peer_addresses(xprt
);
358 xs_format_common_peer_ports(xprt
);
361 static void xs_update_peer_port(struct rpc_xprt
*xprt
)
363 kfree(xprt
->address_strings
[RPC_DISPLAY_HEX_PORT
]);
364 kfree(xprt
->address_strings
[RPC_DISPLAY_PORT
]);
366 xs_format_common_peer_ports(xprt
);
369 static void xs_free_peer_addresses(struct rpc_xprt
*xprt
)
373 for (i
= 0; i
< RPC_DISPLAY_MAX
; i
++)
375 case RPC_DISPLAY_PROTO
:
376 case RPC_DISPLAY_NETID
:
379 kfree(xprt
->address_strings
[i
]);
383 #define XS_SENDMSG_FLAGS (MSG_DONTWAIT | MSG_NOSIGNAL)
385 static int xs_send_kvec(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct kvec
*vec
, unsigned int base
, int more
)
387 struct msghdr msg
= {
389 .msg_namelen
= addrlen
,
390 .msg_flags
= XS_SENDMSG_FLAGS
| (more
? MSG_MORE
: 0),
393 .iov_base
= vec
->iov_base
+ base
,
394 .iov_len
= vec
->iov_len
- base
,
397 if (iov
.iov_len
!= 0)
398 return kernel_sendmsg(sock
, &msg
, &iov
, 1, iov
.iov_len
);
399 return kernel_sendmsg(sock
, &msg
, NULL
, 0, 0);
402 static int xs_send_pagedata(struct socket
*sock
, struct xdr_buf
*xdr
, unsigned int base
, int more
, bool zerocopy
)
404 ssize_t (*do_sendpage
)(struct socket
*sock
, struct page
*page
,
405 int offset
, size_t size
, int flags
);
407 unsigned int remainder
;
410 remainder
= xdr
->page_len
- base
;
411 base
+= xdr
->page_base
;
412 ppage
= xdr
->pages
+ (base
>> PAGE_SHIFT
);
414 do_sendpage
= sock
->ops
->sendpage
;
416 do_sendpage
= sock_no_sendpage
;
418 unsigned int len
= min_t(unsigned int, PAGE_SIZE
- base
, remainder
);
419 int flags
= XS_SENDMSG_FLAGS
;
422 if (remainder
!= 0 || more
)
424 err
= do_sendpage(sock
, *ppage
, base
, len
, flags
);
425 if (remainder
== 0 || err
!= len
)
439 * xs_sendpages - write pages directly to a socket
440 * @sock: socket to send on
441 * @addr: UDP only -- address of destination
442 * @addrlen: UDP only -- length of destination address
443 * @xdr: buffer containing this request
444 * @base: starting position in the buffer
445 * @zerocopy: true if it is safe to use sendpage()
448 static int xs_sendpages(struct socket
*sock
, struct sockaddr
*addr
, int addrlen
, struct xdr_buf
*xdr
, unsigned int base
, bool zerocopy
)
450 unsigned int remainder
= xdr
->len
- base
;
456 clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
);
462 if (base
< xdr
->head
[0].iov_len
|| addr
!= NULL
) {
463 unsigned int len
= xdr
->head
[0].iov_len
- base
;
465 err
= xs_send_kvec(sock
, addr
, addrlen
, &xdr
->head
[0], base
, remainder
!= 0);
466 if (remainder
== 0 || err
!= len
)
471 base
-= xdr
->head
[0].iov_len
;
473 if (base
< xdr
->page_len
) {
474 unsigned int len
= xdr
->page_len
- base
;
476 err
= xs_send_pagedata(sock
, xdr
, base
, remainder
!= 0, zerocopy
);
477 if (remainder
== 0 || err
!= len
)
482 base
-= xdr
->page_len
;
484 if (base
>= xdr
->tail
[0].iov_len
)
486 err
= xs_send_kvec(sock
, NULL
, 0, &xdr
->tail
[0], base
, 0);
495 static void xs_nospace_callback(struct rpc_task
*task
)
497 struct sock_xprt
*transport
= container_of(task
->tk_rqstp
->rq_xprt
, struct sock_xprt
, xprt
);
499 transport
->inet
->sk_write_pending
--;
500 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
504 * xs_nospace - place task on wait queue if transmit was incomplete
505 * @task: task to put to sleep
508 static int xs_nospace(struct rpc_task
*task
)
510 struct rpc_rqst
*req
= task
->tk_rqstp
;
511 struct rpc_xprt
*xprt
= req
->rq_xprt
;
512 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
513 struct sock
*sk
= transport
->inet
;
516 dprintk("RPC: %5u xmit incomplete (%u left of %u)\n",
517 task
->tk_pid
, req
->rq_slen
- req
->rq_bytes_sent
,
520 /* Protect against races with write_space */
521 spin_lock_bh(&xprt
->transport_lock
);
523 /* Don't race with disconnect */
524 if (xprt_connected(xprt
)) {
525 if (test_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
)) {
527 * Notify TCP that we're limited by the application
530 set_bit(SOCK_NOSPACE
, &transport
->sock
->flags
);
531 sk
->sk_write_pending
++;
532 /* ...and wait for more buffer space */
533 xprt_wait_for_buffer_space(task
, xs_nospace_callback
);
536 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
540 spin_unlock_bh(&xprt
->transport_lock
);
542 /* Race breaker in case memory is freed before above code is called */
543 sk
->sk_write_space(sk
);
548 * Construct a stream transport record marker in @buf.
550 static inline void xs_encode_stream_record_marker(struct xdr_buf
*buf
)
552 u32 reclen
= buf
->len
- sizeof(rpc_fraghdr
);
553 rpc_fraghdr
*base
= buf
->head
[0].iov_base
;
554 *base
= cpu_to_be32(RPC_LAST_STREAM_FRAGMENT
| reclen
);
558 * xs_local_send_request - write an RPC request to an AF_LOCAL socket
559 * @task: RPC task that manages the state of an RPC request
562 * 0: The request has been sent
563 * EAGAIN: The socket was blocked, please call again later to
564 * complete the request
565 * ENOTCONN: Caller needs to invoke connect logic then call again
566 * other: Some other error occured, the request was not sent
568 static int xs_local_send_request(struct rpc_task
*task
)
570 struct rpc_rqst
*req
= task
->tk_rqstp
;
571 struct rpc_xprt
*xprt
= req
->rq_xprt
;
572 struct sock_xprt
*transport
=
573 container_of(xprt
, struct sock_xprt
, xprt
);
574 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
577 xs_encode_stream_record_marker(&req
->rq_snd_buf
);
579 xs_pktdump("packet data:",
580 req
->rq_svec
->iov_base
, req
->rq_svec
->iov_len
);
582 status
= xs_sendpages(transport
->sock
, NULL
, 0,
583 xdr
, req
->rq_bytes_sent
, true);
584 dprintk("RPC: %s(%u) = %d\n",
585 __func__
, xdr
->len
- req
->rq_bytes_sent
, status
);
586 if (likely(status
>= 0)) {
587 req
->rq_bytes_sent
+= status
;
588 req
->rq_xmit_bytes_sent
+= status
;
589 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
590 req
->rq_bytes_sent
= 0;
598 status
= xs_nospace(task
);
601 dprintk("RPC: sendmsg returned unrecognized error %d\n",
612 * xs_udp_send_request - write an RPC request to a UDP socket
613 * @task: address of RPC task that manages the state of an RPC request
616 * 0: The request has been sent
617 * EAGAIN: The socket was blocked, please call again later to
618 * complete the request
619 * ENOTCONN: Caller needs to invoke connect logic then call again
620 * other: Some other error occurred, the request was not sent
622 static int xs_udp_send_request(struct rpc_task
*task
)
624 struct rpc_rqst
*req
= task
->tk_rqstp
;
625 struct rpc_xprt
*xprt
= req
->rq_xprt
;
626 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
627 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
630 xs_pktdump("packet data:",
631 req
->rq_svec
->iov_base
,
632 req
->rq_svec
->iov_len
);
634 if (!xprt_bound(xprt
))
636 status
= xs_sendpages(transport
->sock
,
639 req
->rq_bytes_sent
, true);
641 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
642 xdr
->len
- req
->rq_bytes_sent
, status
);
645 req
->rq_xmit_bytes_sent
+= status
;
646 if (status
>= req
->rq_slen
)
648 /* Still some bytes left; set up for a retry later. */
655 /* Should we call xs_close() here? */
658 status
= xs_nospace(task
);
661 dprintk("RPC: sendmsg returned unrecognized error %d\n",
666 /* When the server has died, an ICMP port unreachable message
667 * prompts ECONNREFUSED. */
668 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
675 * xs_tcp_shutdown - gracefully shut down a TCP socket
678 * Initiates a graceful shutdown of the TCP socket by calling the
679 * equivalent of shutdown(SHUT_WR);
681 static void xs_tcp_shutdown(struct rpc_xprt
*xprt
)
683 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
684 struct socket
*sock
= transport
->sock
;
687 kernel_sock_shutdown(sock
, SHUT_WR
);
688 trace_rpc_socket_shutdown(xprt
, sock
);
693 * xs_tcp_send_request - write an RPC request to a TCP socket
694 * @task: address of RPC task that manages the state of an RPC request
697 * 0: The request has been sent
698 * EAGAIN: The socket was blocked, please call again later to
699 * complete the request
700 * ENOTCONN: Caller needs to invoke connect logic then call again
701 * other: Some other error occurred, the request was not sent
703 * XXX: In the case of soft timeouts, should we eventually give up
704 * if sendmsg is not able to make progress?
706 static int xs_tcp_send_request(struct rpc_task
*task
)
708 struct rpc_rqst
*req
= task
->tk_rqstp
;
709 struct rpc_xprt
*xprt
= req
->rq_xprt
;
710 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
711 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
712 bool zerocopy
= true;
715 xs_encode_stream_record_marker(&req
->rq_snd_buf
);
717 xs_pktdump("packet data:",
718 req
->rq_svec
->iov_base
,
719 req
->rq_svec
->iov_len
);
720 /* Don't use zero copy if this is a resend. If the RPC call
721 * completes while the socket holds a reference to the pages,
722 * then we may end up resending corrupted data.
724 if (task
->tk_flags
& RPC_TASK_SENT
)
727 /* Continue transmitting the packet/record. We must be careful
728 * to cope with writespace callbacks arriving _after_ we have
729 * called sendmsg(). */
731 status
= xs_sendpages(transport
->sock
,
732 NULL
, 0, xdr
, req
->rq_bytes_sent
,
735 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
736 xdr
->len
- req
->rq_bytes_sent
, status
);
738 if (unlikely(status
< 0))
741 /* If we've sent the entire packet, immediately
742 * reset the count of bytes sent. */
743 req
->rq_bytes_sent
+= status
;
744 req
->rq_xmit_bytes_sent
+= status
;
745 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
746 req
->rq_bytes_sent
= 0;
759 /* Should we call xs_close() here? */
762 status
= xs_nospace(task
);
765 dprintk("RPC: sendmsg returned unrecognized error %d\n",
768 xs_tcp_shutdown(xprt
);
772 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
779 * xs_tcp_release_xprt - clean up after a tcp transmission
783 * This cleans up if an error causes us to abort the transmission of a request.
784 * In this case, the socket may need to be reset in order to avoid confusing
787 static void xs_tcp_release_xprt(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
789 struct rpc_rqst
*req
;
791 if (task
!= xprt
->snd_task
)
795 req
= task
->tk_rqstp
;
798 if (req
->rq_bytes_sent
== 0)
800 if (req
->rq_bytes_sent
== req
->rq_snd_buf
.len
)
802 set_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
804 xprt_release_xprt(xprt
, task
);
807 static void xs_save_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
809 transport
->old_data_ready
= sk
->sk_data_ready
;
810 transport
->old_state_change
= sk
->sk_state_change
;
811 transport
->old_write_space
= sk
->sk_write_space
;
812 transport
->old_error_report
= sk
->sk_error_report
;
815 static void xs_restore_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
817 sk
->sk_data_ready
= transport
->old_data_ready
;
818 sk
->sk_state_change
= transport
->old_state_change
;
819 sk
->sk_write_space
= transport
->old_write_space
;
820 sk
->sk_error_report
= transport
->old_error_report
;
824 * xs_error_report - callback to handle TCP socket state errors
827 * Note: we don't call sock_error() since there may be a rpc_task
828 * using the socket, and so we don't want to clear sk->sk_err.
830 static void xs_error_report(struct sock
*sk
)
832 struct rpc_xprt
*xprt
;
835 read_lock_bh(&sk
->sk_callback_lock
);
836 if (!(xprt
= xprt_from_sock(sk
)))
842 dprintk("RPC: xs_error_report client %p, error=%d...\n",
844 trace_rpc_socket_error(xprt
, sk
->sk_socket
, err
);
845 xprt_wake_pending_tasks(xprt
, err
);
847 read_unlock_bh(&sk
->sk_callback_lock
);
850 static void xs_reset_transport(struct sock_xprt
*transport
)
852 struct socket
*sock
= transport
->sock
;
853 struct sock
*sk
= transport
->inet
;
858 transport
->srcport
= 0;
860 write_lock_bh(&sk
->sk_callback_lock
);
861 transport
->inet
= NULL
;
862 transport
->sock
= NULL
;
864 sk
->sk_user_data
= NULL
;
866 xs_restore_old_callbacks(transport
, sk
);
867 write_unlock_bh(&sk
->sk_callback_lock
);
871 trace_rpc_socket_close(&transport
->xprt
, sock
);
876 * xs_close - close a socket
879 * This is used when all requests are complete; ie, no DRC state remains
880 * on the server we want to save.
882 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
883 * xs_reset_transport() zeroing the socket from underneath a writer.
885 static void xs_close(struct rpc_xprt
*xprt
)
887 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
889 dprintk("RPC: xs_close xprt %p\n", xprt
);
891 cancel_delayed_work_sync(&transport
->connect_worker
);
893 xs_reset_transport(transport
);
894 xprt
->reestablish_timeout
= 0;
896 smp_mb__before_clear_bit();
897 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
898 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
899 clear_bit(XPRT_CLOSING
, &xprt
->state
);
900 smp_mb__after_clear_bit();
901 xprt_disconnect_done(xprt
);
904 static void xs_tcp_close(struct rpc_xprt
*xprt
)
906 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
))
909 xs_tcp_shutdown(xprt
);
913 * xs_destroy - prepare to shutdown a transport
914 * @xprt: doomed transport
917 static void xs_destroy(struct rpc_xprt
*xprt
)
919 dprintk("RPC: xs_destroy xprt %p\n", xprt
);
922 xs_free_peer_addresses(xprt
);
924 module_put(THIS_MODULE
);
927 static int xs_local_copy_to_xdr(struct xdr_buf
*xdr
, struct sk_buff
*skb
)
929 struct xdr_skb_reader desc
= {
931 .offset
= sizeof(rpc_fraghdr
),
932 .count
= skb
->len
- sizeof(rpc_fraghdr
),
935 if (xdr_partial_copy_from_skb(xdr
, 0, &desc
, xdr_skb_read_bits
) < 0)
943 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
944 * @sk: socket with data to read
945 * @len: how much data to read
947 * Currently this assumes we can read the whole reply in a single gulp.
949 static void xs_local_data_ready(struct sock
*sk
)
951 struct rpc_task
*task
;
952 struct rpc_xprt
*xprt
;
953 struct rpc_rqst
*rovr
;
955 int err
, repsize
, copied
;
959 read_lock_bh(&sk
->sk_callback_lock
);
960 dprintk("RPC: %s...\n", __func__
);
961 xprt
= xprt_from_sock(sk
);
965 skb
= skb_recv_datagram(sk
, 0, 1, &err
);
969 repsize
= skb
->len
- sizeof(rpc_fraghdr
);
971 dprintk("RPC: impossible RPC reply size %d\n", repsize
);
975 /* Copy the XID from the skb... */
976 xp
= skb_header_pointer(skb
, sizeof(rpc_fraghdr
), sizeof(_xid
), &_xid
);
980 /* Look up and lock the request corresponding to the given XID */
981 spin_lock(&xprt
->transport_lock
);
982 rovr
= xprt_lookup_rqst(xprt
, *xp
);
985 task
= rovr
->rq_task
;
987 copied
= rovr
->rq_private_buf
.buflen
;
988 if (copied
> repsize
)
991 if (xs_local_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
992 dprintk("RPC: sk_buff copy failed\n");
996 xprt_complete_rqst(task
, copied
);
999 spin_unlock(&xprt
->transport_lock
);
1001 skb_free_datagram(sk
, skb
);
1003 read_unlock_bh(&sk
->sk_callback_lock
);
1007 * xs_udp_data_ready - "data ready" callback for UDP sockets
1008 * @sk: socket with data to read
1009 * @len: how much data to read
1012 static void xs_udp_data_ready(struct sock
*sk
)
1014 struct rpc_task
*task
;
1015 struct rpc_xprt
*xprt
;
1016 struct rpc_rqst
*rovr
;
1017 struct sk_buff
*skb
;
1018 int err
, repsize
, copied
;
1022 read_lock_bh(&sk
->sk_callback_lock
);
1023 dprintk("RPC: xs_udp_data_ready...\n");
1024 if (!(xprt
= xprt_from_sock(sk
)))
1027 if ((skb
= skb_recv_datagram(sk
, 0, 1, &err
)) == NULL
)
1030 repsize
= skb
->len
- sizeof(struct udphdr
);
1032 dprintk("RPC: impossible RPC reply size %d!\n", repsize
);
1036 /* Copy the XID from the skb... */
1037 xp
= skb_header_pointer(skb
, sizeof(struct udphdr
),
1038 sizeof(_xid
), &_xid
);
1042 /* Look up and lock the request corresponding to the given XID */
1043 spin_lock(&xprt
->transport_lock
);
1044 rovr
= xprt_lookup_rqst(xprt
, *xp
);
1047 task
= rovr
->rq_task
;
1049 if ((copied
= rovr
->rq_private_buf
.buflen
) > repsize
)
1052 /* Suck it into the iovec, verify checksum if not done by hw. */
1053 if (csum_partial_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
1054 UDPX_INC_STATS_BH(sk
, UDP_MIB_INERRORS
);
1058 UDPX_INC_STATS_BH(sk
, UDP_MIB_INDATAGRAMS
);
1060 xprt_adjust_cwnd(xprt
, task
, copied
);
1061 xprt_complete_rqst(task
, copied
);
1064 spin_unlock(&xprt
->transport_lock
);
1066 skb_free_datagram(sk
, skb
);
1068 read_unlock_bh(&sk
->sk_callback_lock
);
1072 * Helper function to force a TCP close if the server is sending
1073 * junk and/or it has put us in CLOSE_WAIT
1075 static void xs_tcp_force_close(struct rpc_xprt
*xprt
)
1077 set_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
);
1078 xprt_force_disconnect(xprt
);
1081 static inline void xs_tcp_read_fraghdr(struct rpc_xprt
*xprt
, struct xdr_skb_reader
*desc
)
1083 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1087 p
= ((char *) &transport
->tcp_fraghdr
) + transport
->tcp_offset
;
1088 len
= sizeof(transport
->tcp_fraghdr
) - transport
->tcp_offset
;
1089 used
= xdr_skb_read_bits(desc
, p
, len
);
1090 transport
->tcp_offset
+= used
;
1094 transport
->tcp_reclen
= ntohl(transport
->tcp_fraghdr
);
1095 if (transport
->tcp_reclen
& RPC_LAST_STREAM_FRAGMENT
)
1096 transport
->tcp_flags
|= TCP_RCV_LAST_FRAG
;
1098 transport
->tcp_flags
&= ~TCP_RCV_LAST_FRAG
;
1099 transport
->tcp_reclen
&= RPC_FRAGMENT_SIZE_MASK
;
1101 transport
->tcp_flags
&= ~TCP_RCV_COPY_FRAGHDR
;
1102 transport
->tcp_offset
= 0;
1104 /* Sanity check of the record length */
1105 if (unlikely(transport
->tcp_reclen
< 8)) {
1106 dprintk("RPC: invalid TCP record fragment length\n");
1107 xs_tcp_force_close(xprt
);
1110 dprintk("RPC: reading TCP record fragment of length %d\n",
1111 transport
->tcp_reclen
);
1114 static void xs_tcp_check_fraghdr(struct sock_xprt
*transport
)
1116 if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1117 transport
->tcp_flags
|= TCP_RCV_COPY_FRAGHDR
;
1118 transport
->tcp_offset
= 0;
1119 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
) {
1120 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1121 transport
->tcp_flags
|= TCP_RCV_COPY_XID
;
1122 transport
->tcp_copied
= 0;
1127 static inline void xs_tcp_read_xid(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1132 len
= sizeof(transport
->tcp_xid
) - transport
->tcp_offset
;
1133 dprintk("RPC: reading XID (%Zu bytes)\n", len
);
1134 p
= ((char *) &transport
->tcp_xid
) + transport
->tcp_offset
;
1135 used
= xdr_skb_read_bits(desc
, p
, len
);
1136 transport
->tcp_offset
+= used
;
1139 transport
->tcp_flags
&= ~TCP_RCV_COPY_XID
;
1140 transport
->tcp_flags
|= TCP_RCV_READ_CALLDIR
;
1141 transport
->tcp_copied
= 4;
1142 dprintk("RPC: reading %s XID %08x\n",
1143 (transport
->tcp_flags
& TCP_RPC_REPLY
) ? "reply for"
1145 ntohl(transport
->tcp_xid
));
1146 xs_tcp_check_fraghdr(transport
);
1149 static inline void xs_tcp_read_calldir(struct sock_xprt
*transport
,
1150 struct xdr_skb_reader
*desc
)
1157 * We want transport->tcp_offset to be 8 at the end of this routine
1158 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1159 * When this function is called for the first time,
1160 * transport->tcp_offset is 4 (after having already read the xid).
1162 offset
= transport
->tcp_offset
- sizeof(transport
->tcp_xid
);
1163 len
= sizeof(transport
->tcp_calldir
) - offset
;
1164 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len
);
1165 p
= ((char *) &transport
->tcp_calldir
) + offset
;
1166 used
= xdr_skb_read_bits(desc
, p
, len
);
1167 transport
->tcp_offset
+= used
;
1170 transport
->tcp_flags
&= ~TCP_RCV_READ_CALLDIR
;
1172 * We don't yet have the XDR buffer, so we will write the calldir
1173 * out after we get the buffer from the 'struct rpc_rqst'
1175 switch (ntohl(transport
->tcp_calldir
)) {
1177 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1178 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1179 transport
->tcp_flags
|= TCP_RPC_REPLY
;
1182 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1183 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1184 transport
->tcp_flags
&= ~TCP_RPC_REPLY
;
1187 dprintk("RPC: invalid request message type\n");
1188 xs_tcp_force_close(&transport
->xprt
);
1190 xs_tcp_check_fraghdr(transport
);
1193 static inline void xs_tcp_read_common(struct rpc_xprt
*xprt
,
1194 struct xdr_skb_reader
*desc
,
1195 struct rpc_rqst
*req
)
1197 struct sock_xprt
*transport
=
1198 container_of(xprt
, struct sock_xprt
, xprt
);
1199 struct xdr_buf
*rcvbuf
;
1203 rcvbuf
= &req
->rq_private_buf
;
1205 if (transport
->tcp_flags
& TCP_RCV_COPY_CALLDIR
) {
1207 * Save the RPC direction in the XDR buffer
1209 memcpy(rcvbuf
->head
[0].iov_base
+ transport
->tcp_copied
,
1210 &transport
->tcp_calldir
,
1211 sizeof(transport
->tcp_calldir
));
1212 transport
->tcp_copied
+= sizeof(transport
->tcp_calldir
);
1213 transport
->tcp_flags
&= ~TCP_RCV_COPY_CALLDIR
;
1217 if (len
> transport
->tcp_reclen
- transport
->tcp_offset
) {
1218 struct xdr_skb_reader my_desc
;
1220 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1221 memcpy(&my_desc
, desc
, sizeof(my_desc
));
1222 my_desc
.count
= len
;
1223 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1224 &my_desc
, xdr_skb_read_bits
);
1228 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1229 desc
, xdr_skb_read_bits
);
1232 transport
->tcp_copied
+= r
;
1233 transport
->tcp_offset
+= r
;
1236 /* Error when copying to the receive buffer,
1237 * usually because we weren't able to allocate
1238 * additional buffer pages. All we can do now
1239 * is turn off TCP_RCV_COPY_DATA, so the request
1240 * will not receive any additional updates,
1242 * Any remaining data from this record will
1245 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1246 dprintk("RPC: XID %08x truncated request\n",
1247 ntohl(transport
->tcp_xid
));
1248 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1249 "tcp_offset = %u, tcp_reclen = %u\n",
1250 xprt
, transport
->tcp_copied
,
1251 transport
->tcp_offset
, transport
->tcp_reclen
);
1255 dprintk("RPC: XID %08x read %Zd bytes\n",
1256 ntohl(transport
->tcp_xid
), r
);
1257 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1258 "tcp_reclen = %u\n", xprt
, transport
->tcp_copied
,
1259 transport
->tcp_offset
, transport
->tcp_reclen
);
1261 if (transport
->tcp_copied
== req
->rq_private_buf
.buflen
)
1262 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1263 else if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1264 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
)
1265 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1270 * Finds the request corresponding to the RPC xid and invokes the common
1271 * tcp read code to read the data.
1273 static inline int xs_tcp_read_reply(struct rpc_xprt
*xprt
,
1274 struct xdr_skb_reader
*desc
)
1276 struct sock_xprt
*transport
=
1277 container_of(xprt
, struct sock_xprt
, xprt
);
1278 struct rpc_rqst
*req
;
1280 dprintk("RPC: read reply XID %08x\n", ntohl(transport
->tcp_xid
));
1282 /* Find and lock the request corresponding to this xid */
1283 spin_lock(&xprt
->transport_lock
);
1284 req
= xprt_lookup_rqst(xprt
, transport
->tcp_xid
);
1286 dprintk("RPC: XID %08x request not found!\n",
1287 ntohl(transport
->tcp_xid
));
1288 spin_unlock(&xprt
->transport_lock
);
1292 xs_tcp_read_common(xprt
, desc
, req
);
1294 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1295 xprt_complete_rqst(req
->rq_task
, transport
->tcp_copied
);
1297 spin_unlock(&xprt
->transport_lock
);
1301 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1303 * Obtains an rpc_rqst previously allocated and invokes the common
1304 * tcp read code to read the data. The result is placed in the callback
1306 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1307 * connection and return -1.
1309 static int xs_tcp_read_callback(struct rpc_xprt
*xprt
,
1310 struct xdr_skb_reader
*desc
)
1312 struct sock_xprt
*transport
=
1313 container_of(xprt
, struct sock_xprt
, xprt
);
1314 struct rpc_rqst
*req
;
1316 /* Look up and lock the request corresponding to the given XID */
1317 spin_lock(&xprt
->transport_lock
);
1318 req
= xprt_lookup_bc_request(xprt
, transport
->tcp_xid
);
1320 spin_unlock(&xprt
->transport_lock
);
1321 printk(KERN_WARNING
"Callback slot table overflowed\n");
1322 xprt_force_disconnect(xprt
);
1326 dprintk("RPC: read callback XID %08x\n", ntohl(req
->rq_xid
));
1327 xs_tcp_read_common(xprt
, desc
, req
);
1329 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1330 xprt_complete_bc_request(req
, transport
->tcp_copied
);
1331 spin_unlock(&xprt
->transport_lock
);
1336 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1337 struct xdr_skb_reader
*desc
)
1339 struct sock_xprt
*transport
=
1340 container_of(xprt
, struct sock_xprt
, xprt
);
1342 return (transport
->tcp_flags
& TCP_RPC_REPLY
) ?
1343 xs_tcp_read_reply(xprt
, desc
) :
1344 xs_tcp_read_callback(xprt
, desc
);
1347 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1348 struct xdr_skb_reader
*desc
)
1350 return xs_tcp_read_reply(xprt
, desc
);
1352 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1355 * Read data off the transport. This can be either an RPC_CALL or an
1356 * RPC_REPLY. Relay the processing to helper functions.
1358 static void xs_tcp_read_data(struct rpc_xprt
*xprt
,
1359 struct xdr_skb_reader
*desc
)
1361 struct sock_xprt
*transport
=
1362 container_of(xprt
, struct sock_xprt
, xprt
);
1364 if (_xs_tcp_read_data(xprt
, desc
) == 0)
1365 xs_tcp_check_fraghdr(transport
);
1368 * The transport_lock protects the request handling.
1369 * There's no need to hold it to update the tcp_flags.
1371 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1375 static inline void xs_tcp_read_discard(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1379 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1380 if (len
> desc
->count
)
1383 desc
->offset
+= len
;
1384 transport
->tcp_offset
+= len
;
1385 dprintk("RPC: discarded %Zu bytes\n", len
);
1386 xs_tcp_check_fraghdr(transport
);
1389 static int xs_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
, unsigned int offset
, size_t len
)
1391 struct rpc_xprt
*xprt
= rd_desc
->arg
.data
;
1392 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1393 struct xdr_skb_reader desc
= {
1399 dprintk("RPC: xs_tcp_data_recv started\n");
1401 /* Read in a new fragment marker if necessary */
1402 /* Can we ever really expect to get completely empty fragments? */
1403 if (transport
->tcp_flags
& TCP_RCV_COPY_FRAGHDR
) {
1404 xs_tcp_read_fraghdr(xprt
, &desc
);
1407 /* Read in the xid if necessary */
1408 if (transport
->tcp_flags
& TCP_RCV_COPY_XID
) {
1409 xs_tcp_read_xid(transport
, &desc
);
1412 /* Read in the call/reply flag */
1413 if (transport
->tcp_flags
& TCP_RCV_READ_CALLDIR
) {
1414 xs_tcp_read_calldir(transport
, &desc
);
1417 /* Read in the request data */
1418 if (transport
->tcp_flags
& TCP_RCV_COPY_DATA
) {
1419 xs_tcp_read_data(xprt
, &desc
);
1422 /* Skip over any trailing bytes on short reads */
1423 xs_tcp_read_discard(transport
, &desc
);
1424 } while (desc
.count
);
1425 dprintk("RPC: xs_tcp_data_recv done\n");
1426 return len
- desc
.count
;
1430 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1431 * @sk: socket with data to read
1432 * @bytes: how much data to read
1435 static void xs_tcp_data_ready(struct sock
*sk
)
1437 struct rpc_xprt
*xprt
;
1438 read_descriptor_t rd_desc
;
1441 dprintk("RPC: xs_tcp_data_ready...\n");
1443 read_lock_bh(&sk
->sk_callback_lock
);
1444 if (!(xprt
= xprt_from_sock(sk
)))
1446 /* Any data means we had a useful conversation, so
1447 * the we don't need to delay the next reconnect
1449 if (xprt
->reestablish_timeout
)
1450 xprt
->reestablish_timeout
= 0;
1452 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1453 rd_desc
.arg
.data
= xprt
;
1455 rd_desc
.count
= 65536;
1456 read
= tcp_read_sock(sk
, &rd_desc
, xs_tcp_data_recv
);
1459 read_unlock_bh(&sk
->sk_callback_lock
);
1463 * Do the equivalent of linger/linger2 handling for dealing with
1464 * broken servers that don't close the socket in a timely
1467 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt
*xprt
,
1468 unsigned long timeout
)
1470 struct sock_xprt
*transport
;
1472 if (xprt_test_and_set_connecting(xprt
))
1474 set_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1475 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1476 queue_delayed_work(rpciod_workqueue
, &transport
->connect_worker
,
1480 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt
*xprt
)
1482 struct sock_xprt
*transport
;
1484 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1486 if (!test_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
) ||
1487 !cancel_delayed_work(&transport
->connect_worker
))
1489 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1490 xprt_clear_connecting(xprt
);
1493 static void xs_sock_reset_connection_flags(struct rpc_xprt
*xprt
)
1495 smp_mb__before_clear_bit();
1496 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1497 clear_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
);
1498 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1499 clear_bit(XPRT_CLOSING
, &xprt
->state
);
1500 smp_mb__after_clear_bit();
1503 static void xs_sock_mark_closed(struct rpc_xprt
*xprt
)
1505 xs_sock_reset_connection_flags(xprt
);
1506 /* Mark transport as closed and wake up all pending tasks */
1507 xprt_disconnect_done(xprt
);
1511 * xs_tcp_state_change - callback to handle TCP socket state changes
1512 * @sk: socket whose state has changed
1515 static void xs_tcp_state_change(struct sock
*sk
)
1517 struct rpc_xprt
*xprt
;
1519 read_lock_bh(&sk
->sk_callback_lock
);
1520 if (!(xprt
= xprt_from_sock(sk
)))
1522 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt
);
1523 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1524 sk
->sk_state
, xprt_connected(xprt
),
1525 sock_flag(sk
, SOCK_DEAD
),
1526 sock_flag(sk
, SOCK_ZAPPED
),
1529 trace_rpc_socket_state_change(xprt
, sk
->sk_socket
);
1530 switch (sk
->sk_state
) {
1531 case TCP_ESTABLISHED
:
1532 spin_lock(&xprt
->transport_lock
);
1533 if (!xprt_test_and_set_connected(xprt
)) {
1534 struct sock_xprt
*transport
= container_of(xprt
,
1535 struct sock_xprt
, xprt
);
1537 /* Reset TCP record info */
1538 transport
->tcp_offset
= 0;
1539 transport
->tcp_reclen
= 0;
1540 transport
->tcp_copied
= 0;
1541 transport
->tcp_flags
=
1542 TCP_RCV_COPY_FRAGHDR
| TCP_RCV_COPY_XID
;
1543 xprt
->connect_cookie
++;
1545 xprt_wake_pending_tasks(xprt
, -EAGAIN
);
1547 spin_unlock(&xprt
->transport_lock
);
1550 /* The client initiated a shutdown of the socket */
1551 xprt
->connect_cookie
++;
1552 xprt
->reestablish_timeout
= 0;
1553 set_bit(XPRT_CLOSING
, &xprt
->state
);
1554 smp_mb__before_clear_bit();
1555 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1556 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1557 smp_mb__after_clear_bit();
1558 xs_tcp_schedule_linger_timeout(xprt
, xs_tcp_fin_timeout
);
1560 case TCP_CLOSE_WAIT
:
1561 /* The server initiated a shutdown of the socket */
1562 xprt
->connect_cookie
++;
1563 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1564 xs_tcp_force_close(xprt
);
1567 * If the server closed down the connection, make sure that
1568 * we back off before reconnecting
1570 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
1571 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1574 set_bit(XPRT_CLOSING
, &xprt
->state
);
1575 xs_tcp_schedule_linger_timeout(xprt
, xs_tcp_fin_timeout
);
1576 smp_mb__before_clear_bit();
1577 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1578 smp_mb__after_clear_bit();
1581 xs_tcp_cancel_linger_timeout(xprt
);
1582 xs_sock_mark_closed(xprt
);
1585 read_unlock_bh(&sk
->sk_callback_lock
);
1588 static void xs_write_space(struct sock
*sk
)
1590 struct socket
*sock
;
1591 struct rpc_xprt
*xprt
;
1593 if (unlikely(!(sock
= sk
->sk_socket
)))
1595 clear_bit(SOCK_NOSPACE
, &sock
->flags
);
1597 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
1599 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
) == 0)
1602 xprt_write_space(xprt
);
1606 * xs_udp_write_space - callback invoked when socket buffer space
1608 * @sk: socket whose state has changed
1610 * Called when more output buffer space is available for this socket.
1611 * We try not to wake our writers until they can make "significant"
1612 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1613 * with a bunch of small requests.
1615 static void xs_udp_write_space(struct sock
*sk
)
1617 read_lock_bh(&sk
->sk_callback_lock
);
1619 /* from net/core/sock.c:sock_def_write_space */
1620 if (sock_writeable(sk
))
1623 read_unlock_bh(&sk
->sk_callback_lock
);
1627 * xs_tcp_write_space - callback invoked when socket buffer space
1629 * @sk: socket whose state has changed
1631 * Called when more output buffer space is available for this socket.
1632 * We try not to wake our writers until they can make "significant"
1633 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1634 * with a bunch of small requests.
1636 static void xs_tcp_write_space(struct sock
*sk
)
1638 read_lock_bh(&sk
->sk_callback_lock
);
1640 /* from net/core/stream.c:sk_stream_write_space */
1641 if (sk_stream_is_writeable(sk
))
1644 read_unlock_bh(&sk
->sk_callback_lock
);
1647 static void xs_udp_do_set_buffer_size(struct rpc_xprt
*xprt
)
1649 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1650 struct sock
*sk
= transport
->inet
;
1652 if (transport
->rcvsize
) {
1653 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
1654 sk
->sk_rcvbuf
= transport
->rcvsize
* xprt
->max_reqs
* 2;
1656 if (transport
->sndsize
) {
1657 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
1658 sk
->sk_sndbuf
= transport
->sndsize
* xprt
->max_reqs
* 2;
1659 sk
->sk_write_space(sk
);
1664 * xs_udp_set_buffer_size - set send and receive limits
1665 * @xprt: generic transport
1666 * @sndsize: requested size of send buffer, in bytes
1667 * @rcvsize: requested size of receive buffer, in bytes
1669 * Set socket send and receive buffer size limits.
1671 static void xs_udp_set_buffer_size(struct rpc_xprt
*xprt
, size_t sndsize
, size_t rcvsize
)
1673 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1675 transport
->sndsize
= 0;
1677 transport
->sndsize
= sndsize
+ 1024;
1678 transport
->rcvsize
= 0;
1680 transport
->rcvsize
= rcvsize
+ 1024;
1682 xs_udp_do_set_buffer_size(xprt
);
1686 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1687 * @task: task that timed out
1689 * Adjust the congestion window after a retransmit timeout has occurred.
1691 static void xs_udp_timer(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1693 xprt_adjust_cwnd(xprt
, task
, -ETIMEDOUT
);
1696 static unsigned short xs_get_random_port(void)
1698 unsigned short range
= xprt_max_resvport
- xprt_min_resvport
;
1699 unsigned short rand
= (unsigned short) prandom_u32() % range
;
1700 return rand
+ xprt_min_resvport
;
1704 * xs_set_port - reset the port number in the remote endpoint address
1705 * @xprt: generic transport
1706 * @port: new port number
1709 static void xs_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1711 dprintk("RPC: setting port for xprt %p to %u\n", xprt
, port
);
1713 rpc_set_port(xs_addr(xprt
), port
);
1714 xs_update_peer_port(xprt
);
1717 static unsigned short xs_get_srcport(struct sock_xprt
*transport
)
1719 unsigned short port
= transport
->srcport
;
1721 if (port
== 0 && transport
->xprt
.resvport
)
1722 port
= xs_get_random_port();
1726 static unsigned short xs_next_srcport(struct sock_xprt
*transport
, unsigned short port
)
1728 if (transport
->srcport
!= 0)
1729 transport
->srcport
= 0;
1730 if (!transport
->xprt
.resvport
)
1732 if (port
<= xprt_min_resvport
|| port
> xprt_max_resvport
)
1733 return xprt_max_resvport
;
1736 static int xs_bind(struct sock_xprt
*transport
, struct socket
*sock
)
1738 struct sockaddr_storage myaddr
;
1740 unsigned short port
= xs_get_srcport(transport
);
1741 unsigned short last
;
1743 memcpy(&myaddr
, &transport
->srcaddr
, transport
->xprt
.addrlen
);
1745 rpc_set_port((struct sockaddr
*)&myaddr
, port
);
1746 err
= kernel_bind(sock
, (struct sockaddr
*)&myaddr
,
1747 transport
->xprt
.addrlen
);
1751 transport
->srcport
= port
;
1755 port
= xs_next_srcport(transport
, port
);
1758 } while (err
== -EADDRINUSE
&& nloop
!= 2);
1760 if (myaddr
.ss_family
== AF_INET
)
1761 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__
,
1762 &((struct sockaddr_in
*)&myaddr
)->sin_addr
,
1763 port
, err
? "failed" : "ok", err
);
1765 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__
,
1766 &((struct sockaddr_in6
*)&myaddr
)->sin6_addr
,
1767 port
, err
? "failed" : "ok", err
);
1772 * We don't support autobind on AF_LOCAL sockets
1774 static void xs_local_rpcbind(struct rpc_task
*task
)
1777 xprt_set_bound(rcu_dereference(task
->tk_client
->cl_xprt
));
1781 static void xs_local_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1785 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1786 static struct lock_class_key xs_key
[2];
1787 static struct lock_class_key xs_slock_key
[2];
1789 static inline void xs_reclassify_socketu(struct socket
*sock
)
1791 struct sock
*sk
= sock
->sk
;
1793 sock_lock_init_class_and_name(sk
, "slock-AF_LOCAL-RPC",
1794 &xs_slock_key
[1], "sk_lock-AF_LOCAL-RPC", &xs_key
[1]);
1797 static inline void xs_reclassify_socket4(struct socket
*sock
)
1799 struct sock
*sk
= sock
->sk
;
1801 sock_lock_init_class_and_name(sk
, "slock-AF_INET-RPC",
1802 &xs_slock_key
[0], "sk_lock-AF_INET-RPC", &xs_key
[0]);
1805 static inline void xs_reclassify_socket6(struct socket
*sock
)
1807 struct sock
*sk
= sock
->sk
;
1809 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-RPC",
1810 &xs_slock_key
[1], "sk_lock-AF_INET6-RPC", &xs_key
[1]);
1813 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1815 WARN_ON_ONCE(sock_owned_by_user(sock
->sk
));
1816 if (sock_owned_by_user(sock
->sk
))
1821 xs_reclassify_socketu(sock
);
1824 xs_reclassify_socket4(sock
);
1827 xs_reclassify_socket6(sock
);
1832 static inline void xs_reclassify_socketu(struct socket
*sock
)
1836 static inline void xs_reclassify_socket4(struct socket
*sock
)
1840 static inline void xs_reclassify_socket6(struct socket
*sock
)
1844 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1849 static void xs_dummy_setup_socket(struct work_struct
*work
)
1853 static struct socket
*xs_create_sock(struct rpc_xprt
*xprt
,
1854 struct sock_xprt
*transport
, int family
, int type
, int protocol
)
1856 struct socket
*sock
;
1859 err
= __sock_create(xprt
->xprt_net
, family
, type
, protocol
, &sock
, 1);
1861 dprintk("RPC: can't create %d transport socket (%d).\n",
1865 xs_reclassify_socket(family
, sock
);
1867 err
= xs_bind(transport
, sock
);
1875 return ERR_PTR(err
);
1878 static int xs_local_finish_connecting(struct rpc_xprt
*xprt
,
1879 struct socket
*sock
)
1881 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1884 if (!transport
->inet
) {
1885 struct sock
*sk
= sock
->sk
;
1887 write_lock_bh(&sk
->sk_callback_lock
);
1889 xs_save_old_callbacks(transport
, sk
);
1891 sk
->sk_user_data
= xprt
;
1892 sk
->sk_data_ready
= xs_local_data_ready
;
1893 sk
->sk_write_space
= xs_udp_write_space
;
1894 sk
->sk_error_report
= xs_error_report
;
1895 sk
->sk_allocation
= GFP_ATOMIC
;
1897 xprt_clear_connected(xprt
);
1899 /* Reset to new socket */
1900 transport
->sock
= sock
;
1901 transport
->inet
= sk
;
1903 write_unlock_bh(&sk
->sk_callback_lock
);
1906 /* Tell the socket layer to start connecting... */
1907 xprt
->stat
.connect_count
++;
1908 xprt
->stat
.connect_start
= jiffies
;
1909 return kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, 0);
1913 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1914 * @xprt: RPC transport to connect
1915 * @transport: socket transport to connect
1916 * @create_sock: function to create a socket of the correct type
1918 static int xs_local_setup_socket(struct sock_xprt
*transport
)
1920 struct rpc_xprt
*xprt
= &transport
->xprt
;
1921 struct socket
*sock
;
1924 current
->flags
|= PF_FSTRANS
;
1926 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1927 status
= __sock_create(xprt
->xprt_net
, AF_LOCAL
,
1928 SOCK_STREAM
, 0, &sock
, 1);
1930 dprintk("RPC: can't create AF_LOCAL "
1931 "transport socket (%d).\n", -status
);
1934 xs_reclassify_socketu(sock
);
1936 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1937 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1939 status
= xs_local_finish_connecting(xprt
, sock
);
1940 trace_rpc_socket_connect(xprt
, sock
, status
);
1943 dprintk("RPC: xprt %p connected to %s\n",
1944 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1945 xprt_set_connected(xprt
);
1948 dprintk("RPC: xprt %p: socket %s does not exist\n",
1949 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1952 dprintk("RPC: xprt %p: connection refused for %s\n",
1953 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1956 printk(KERN_ERR
"%s: unhandled error (%d) connecting to %s\n",
1958 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1962 xprt_clear_connecting(xprt
);
1963 xprt_wake_pending_tasks(xprt
, status
);
1964 current
->flags
&= ~PF_FSTRANS
;
1968 static void xs_local_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1970 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1973 if (RPC_IS_ASYNC(task
)) {
1975 * We want the AF_LOCAL connect to be resolved in the
1976 * filesystem namespace of the process making the rpc
1977 * call. Thus we connect synchronously.
1979 * If we want to support asynchronous AF_LOCAL calls,
1980 * we'll need to figure out how to pass a namespace to
1983 rpc_exit(task
, -ENOTCONN
);
1986 ret
= xs_local_setup_socket(transport
);
1987 if (ret
&& !RPC_IS_SOFTCONN(task
))
1988 msleep_interruptible(15000);
1991 #ifdef CONFIG_SUNRPC_SWAP
1992 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
1994 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1998 sk_set_memalloc(transport
->inet
);
2002 * xs_swapper - Tag this transport as being used for swap.
2003 * @xprt: transport to tag
2004 * @enable: enable/disable
2007 int xs_swapper(struct rpc_xprt
*xprt
, int enable
)
2009 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
2015 xs_set_memalloc(xprt
);
2016 } else if (xprt
->swapper
) {
2018 sk_clear_memalloc(transport
->inet
);
2023 EXPORT_SYMBOL_GPL(xs_swapper
);
2025 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
2030 static void xs_udp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2032 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2034 if (!transport
->inet
) {
2035 struct sock
*sk
= sock
->sk
;
2037 write_lock_bh(&sk
->sk_callback_lock
);
2039 xs_save_old_callbacks(transport
, sk
);
2041 sk
->sk_user_data
= xprt
;
2042 sk
->sk_data_ready
= xs_udp_data_ready
;
2043 sk
->sk_write_space
= xs_udp_write_space
;
2044 sk
->sk_no_check
= UDP_CSUM_NORCV
;
2045 sk
->sk_allocation
= GFP_ATOMIC
;
2047 xprt_set_connected(xprt
);
2049 /* Reset to new socket */
2050 transport
->sock
= sock
;
2051 transport
->inet
= sk
;
2053 xs_set_memalloc(xprt
);
2055 write_unlock_bh(&sk
->sk_callback_lock
);
2057 xs_udp_do_set_buffer_size(xprt
);
2060 static void xs_udp_setup_socket(struct work_struct
*work
)
2062 struct sock_xprt
*transport
=
2063 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2064 struct rpc_xprt
*xprt
= &transport
->xprt
;
2065 struct socket
*sock
= transport
->sock
;
2068 current
->flags
|= PF_FSTRANS
;
2070 /* Start by resetting any existing state */
2071 xs_reset_transport(transport
);
2072 sock
= xs_create_sock(xprt
, transport
,
2073 xs_addr(xprt
)->sa_family
, SOCK_DGRAM
, IPPROTO_UDP
);
2077 dprintk("RPC: worker connecting xprt %p via %s to "
2078 "%s (port %s)\n", xprt
,
2079 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2080 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2081 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2083 xs_udp_finish_connecting(xprt
, sock
);
2084 trace_rpc_socket_connect(xprt
, sock
, 0);
2087 xprt_clear_connecting(xprt
);
2088 xprt_wake_pending_tasks(xprt
, status
);
2089 current
->flags
&= ~PF_FSTRANS
;
2093 * We need to preserve the port number so the reply cache on the server can
2094 * find our cached RPC replies when we get around to reconnecting.
2096 static void xs_abort_connection(struct sock_xprt
*transport
)
2099 struct sockaddr any
;
2101 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport
);
2104 * Disconnect the transport socket by doing a connect operation
2105 * with AF_UNSPEC. This should return immediately...
2107 memset(&any
, 0, sizeof(any
));
2108 any
.sa_family
= AF_UNSPEC
;
2109 result
= kernel_connect(transport
->sock
, &any
, sizeof(any
), 0);
2110 trace_rpc_socket_reset_connection(&transport
->xprt
,
2111 transport
->sock
, result
);
2113 xs_sock_reset_connection_flags(&transport
->xprt
);
2114 dprintk("RPC: AF_UNSPEC connect return code %d\n", result
);
2117 static void xs_tcp_reuse_connection(struct sock_xprt
*transport
)
2119 unsigned int state
= transport
->inet
->sk_state
;
2121 if (state
== TCP_CLOSE
&& transport
->sock
->state
== SS_UNCONNECTED
) {
2122 /* we don't need to abort the connection if the socket
2123 * hasn't undergone a shutdown
2125 if (transport
->inet
->sk_shutdown
== 0)
2127 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2128 __func__
, transport
->inet
->sk_shutdown
);
2130 if ((1 << state
) & (TCPF_ESTABLISHED
|TCPF_SYN_SENT
)) {
2131 /* we don't need to abort the connection if the socket
2132 * hasn't undergone a shutdown
2134 if (transport
->inet
->sk_shutdown
== 0)
2136 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2137 "sk_shutdown set to %d\n",
2138 __func__
, transport
->inet
->sk_shutdown
);
2140 xs_abort_connection(transport
);
2143 static int xs_tcp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2145 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2146 int ret
= -ENOTCONN
;
2148 if (!transport
->inet
) {
2149 struct sock
*sk
= sock
->sk
;
2150 unsigned int keepidle
= xprt
->timeout
->to_initval
/ HZ
;
2151 unsigned int keepcnt
= xprt
->timeout
->to_retries
+ 1;
2152 unsigned int opt_on
= 1;
2154 /* TCP Keepalive options */
2155 kernel_setsockopt(sock
, SOL_SOCKET
, SO_KEEPALIVE
,
2156 (char *)&opt_on
, sizeof(opt_on
));
2157 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPIDLE
,
2158 (char *)&keepidle
, sizeof(keepidle
));
2159 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPINTVL
,
2160 (char *)&keepidle
, sizeof(keepidle
));
2161 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPCNT
,
2162 (char *)&keepcnt
, sizeof(keepcnt
));
2164 write_lock_bh(&sk
->sk_callback_lock
);
2166 xs_save_old_callbacks(transport
, sk
);
2168 sk
->sk_user_data
= xprt
;
2169 sk
->sk_data_ready
= xs_tcp_data_ready
;
2170 sk
->sk_state_change
= xs_tcp_state_change
;
2171 sk
->sk_write_space
= xs_tcp_write_space
;
2172 sk
->sk_error_report
= xs_error_report
;
2173 sk
->sk_allocation
= GFP_ATOMIC
;
2175 /* socket options */
2176 sk
->sk_userlocks
|= SOCK_BINDPORT_LOCK
;
2177 sock_reset_flag(sk
, SOCK_LINGER
);
2178 tcp_sk(sk
)->linger2
= 0;
2179 tcp_sk(sk
)->nonagle
|= TCP_NAGLE_OFF
;
2181 xprt_clear_connected(xprt
);
2183 /* Reset to new socket */
2184 transport
->sock
= sock
;
2185 transport
->inet
= sk
;
2187 write_unlock_bh(&sk
->sk_callback_lock
);
2190 if (!xprt_bound(xprt
))
2193 xs_set_memalloc(xprt
);
2195 /* Tell the socket layer to start connecting... */
2196 xprt
->stat
.connect_count
++;
2197 xprt
->stat
.connect_start
= jiffies
;
2198 ret
= kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, O_NONBLOCK
);
2203 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2204 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2211 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2212 * @xprt: RPC transport to connect
2213 * @transport: socket transport to connect
2214 * @create_sock: function to create a socket of the correct type
2216 * Invoked by a work queue tasklet.
2218 static void xs_tcp_setup_socket(struct work_struct
*work
)
2220 struct sock_xprt
*transport
=
2221 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2222 struct socket
*sock
= transport
->sock
;
2223 struct rpc_xprt
*xprt
= &transport
->xprt
;
2226 current
->flags
|= PF_FSTRANS
;
2229 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
2230 sock
= xs_create_sock(xprt
, transport
,
2231 xs_addr(xprt
)->sa_family
, SOCK_STREAM
, IPPROTO_TCP
);
2233 status
= PTR_ERR(sock
);
2239 abort_and_exit
= test_and_clear_bit(XPRT_CONNECTION_ABORT
,
2241 /* "close" the socket, preserving the local port */
2242 xs_tcp_reuse_connection(transport
);
2248 dprintk("RPC: worker connecting xprt %p via %s to "
2249 "%s (port %s)\n", xprt
,
2250 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2251 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2252 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2254 status
= xs_tcp_finish_connecting(xprt
, sock
);
2255 trace_rpc_socket_connect(xprt
, sock
, status
);
2256 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2257 xprt
, -status
, xprt_connected(xprt
),
2258 sock
->sk
->sk_state
);
2261 printk("%s: connect returned unhandled error %d\n",
2263 case -EADDRNOTAVAIL
:
2264 /* We're probably in TIME_WAIT. Get rid of existing socket,
2267 xs_tcp_force_close(xprt
);
2272 xprt_clear_connecting(xprt
);
2273 current
->flags
&= ~PF_FSTRANS
;
2276 /* Happens, for instance, if the user specified a link
2277 * local IPv6 address without a scope-id.
2282 /* retry with existing socket, after a delay */
2288 xprt_clear_connecting(xprt
);
2289 xprt_wake_pending_tasks(xprt
, status
);
2290 current
->flags
&= ~PF_FSTRANS
;
2294 * xs_connect - connect a socket to a remote endpoint
2295 * @xprt: pointer to transport structure
2296 * @task: address of RPC task that manages state of connect request
2298 * TCP: If the remote end dropped the connection, delay reconnecting.
2300 * UDP socket connects are synchronous, but we use a work queue anyway
2301 * to guarantee that even unprivileged user processes can set up a
2302 * socket on a privileged port.
2304 * If a UDP socket connect fails, the delay behavior here prevents
2305 * retry floods (hard mounts).
2307 static void xs_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
2309 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2311 if (transport
->sock
!= NULL
&& !RPC_IS_SOFTCONN(task
)) {
2312 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2314 xprt
, xprt
->reestablish_timeout
/ HZ
);
2315 queue_delayed_work(rpciod_workqueue
,
2316 &transport
->connect_worker
,
2317 xprt
->reestablish_timeout
);
2318 xprt
->reestablish_timeout
<<= 1;
2319 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2320 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2321 if (xprt
->reestablish_timeout
> XS_TCP_MAX_REEST_TO
)
2322 xprt
->reestablish_timeout
= XS_TCP_MAX_REEST_TO
;
2324 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt
);
2325 queue_delayed_work(rpciod_workqueue
,
2326 &transport
->connect_worker
, 0);
2331 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2332 * @xprt: rpc_xprt struct containing statistics
2336 static void xs_local_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2340 if (xprt_connected(xprt
))
2341 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2343 seq_printf(seq
, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2344 "%llu %llu %lu %llu %llu\n",
2345 xprt
->stat
.bind_count
,
2346 xprt
->stat
.connect_count
,
2347 xprt
->stat
.connect_time
,
2351 xprt
->stat
.bad_xids
,
2354 xprt
->stat
.max_slots
,
2355 xprt
->stat
.sending_u
,
2356 xprt
->stat
.pending_u
);
2360 * xs_udp_print_stats - display UDP socket-specifc stats
2361 * @xprt: rpc_xprt struct containing statistics
2365 static void xs_udp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2367 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2369 seq_printf(seq
, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2372 xprt
->stat
.bind_count
,
2375 xprt
->stat
.bad_xids
,
2378 xprt
->stat
.max_slots
,
2379 xprt
->stat
.sending_u
,
2380 xprt
->stat
.pending_u
);
2384 * xs_tcp_print_stats - display TCP socket-specifc stats
2385 * @xprt: rpc_xprt struct containing statistics
2389 static void xs_tcp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2391 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2394 if (xprt_connected(xprt
))
2395 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2397 seq_printf(seq
, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2398 "%llu %llu %lu %llu %llu\n",
2400 xprt
->stat
.bind_count
,
2401 xprt
->stat
.connect_count
,
2402 xprt
->stat
.connect_time
,
2406 xprt
->stat
.bad_xids
,
2409 xprt
->stat
.max_slots
,
2410 xprt
->stat
.sending_u
,
2411 xprt
->stat
.pending_u
);
2415 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2416 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2417 * to use the server side send routines.
2419 static void *bc_malloc(struct rpc_task
*task
, size_t size
)
2422 struct rpc_buffer
*buf
;
2424 WARN_ON_ONCE(size
> PAGE_SIZE
- sizeof(struct rpc_buffer
));
2425 if (size
> PAGE_SIZE
- sizeof(struct rpc_buffer
))
2428 page
= alloc_page(GFP_KERNEL
);
2432 buf
= page_address(page
);
2433 buf
->len
= PAGE_SIZE
;
2439 * Free the space allocated in the bc_alloc routine
2441 static void bc_free(void *buffer
)
2443 struct rpc_buffer
*buf
;
2448 buf
= container_of(buffer
, struct rpc_buffer
, data
);
2449 free_page((unsigned long)buf
);
2453 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2454 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2456 static int bc_sendto(struct rpc_rqst
*req
)
2459 struct xdr_buf
*xbufp
= &req
->rq_snd_buf
;
2460 struct rpc_xprt
*xprt
= req
->rq_xprt
;
2461 struct sock_xprt
*transport
=
2462 container_of(xprt
, struct sock_xprt
, xprt
);
2463 struct socket
*sock
= transport
->sock
;
2464 unsigned long headoff
;
2465 unsigned long tailoff
;
2467 xs_encode_stream_record_marker(xbufp
);
2469 tailoff
= (unsigned long)xbufp
->tail
[0].iov_base
& ~PAGE_MASK
;
2470 headoff
= (unsigned long)xbufp
->head
[0].iov_base
& ~PAGE_MASK
;
2471 len
= svc_send_common(sock
, xbufp
,
2472 virt_to_page(xbufp
->head
[0].iov_base
), headoff
,
2473 xbufp
->tail
[0].iov_base
, tailoff
);
2475 if (len
!= xbufp
->len
) {
2476 printk(KERN_NOTICE
"Error sending entire callback!\n");
2484 * The send routine. Borrows from svc_send
2486 static int bc_send_request(struct rpc_task
*task
)
2488 struct rpc_rqst
*req
= task
->tk_rqstp
;
2489 struct svc_xprt
*xprt
;
2492 dprintk("sending request with xid: %08x\n", ntohl(req
->rq_xid
));
2494 * Get the server socket associated with this callback xprt
2496 xprt
= req
->rq_xprt
->bc_xprt
;
2499 * Grab the mutex to serialize data as the connection is shared
2500 * with the fore channel
2502 if (!mutex_trylock(&xprt
->xpt_mutex
)) {
2503 rpc_sleep_on(&xprt
->xpt_bc_pending
, task
, NULL
);
2504 if (!mutex_trylock(&xprt
->xpt_mutex
))
2506 rpc_wake_up_queued_task(&xprt
->xpt_bc_pending
, task
);
2508 if (test_bit(XPT_DEAD
, &xprt
->xpt_flags
))
2511 len
= bc_sendto(req
);
2512 mutex_unlock(&xprt
->xpt_mutex
);
2521 * The close routine. Since this is client initiated, we do nothing
2524 static void bc_close(struct rpc_xprt
*xprt
)
2529 * The xprt destroy routine. Again, because this connection is client
2530 * initiated, we do nothing
2533 static void bc_destroy(struct rpc_xprt
*xprt
)
2537 static struct rpc_xprt_ops xs_local_ops
= {
2538 .reserve_xprt
= xprt_reserve_xprt
,
2539 .release_xprt
= xs_tcp_release_xprt
,
2540 .alloc_slot
= xprt_alloc_slot
,
2541 .rpcbind
= xs_local_rpcbind
,
2542 .set_port
= xs_local_set_port
,
2543 .connect
= xs_local_connect
,
2544 .buf_alloc
= rpc_malloc
,
2545 .buf_free
= rpc_free
,
2546 .send_request
= xs_local_send_request
,
2547 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2549 .destroy
= xs_destroy
,
2550 .print_stats
= xs_local_print_stats
,
2553 static struct rpc_xprt_ops xs_udp_ops
= {
2554 .set_buffer_size
= xs_udp_set_buffer_size
,
2555 .reserve_xprt
= xprt_reserve_xprt_cong
,
2556 .release_xprt
= xprt_release_xprt_cong
,
2557 .alloc_slot
= xprt_alloc_slot
,
2558 .rpcbind
= rpcb_getport_async
,
2559 .set_port
= xs_set_port
,
2560 .connect
= xs_connect
,
2561 .buf_alloc
= rpc_malloc
,
2562 .buf_free
= rpc_free
,
2563 .send_request
= xs_udp_send_request
,
2564 .set_retrans_timeout
= xprt_set_retrans_timeout_rtt
,
2565 .timer
= xs_udp_timer
,
2566 .release_request
= xprt_release_rqst_cong
,
2568 .destroy
= xs_destroy
,
2569 .print_stats
= xs_udp_print_stats
,
2572 static struct rpc_xprt_ops xs_tcp_ops
= {
2573 .reserve_xprt
= xprt_reserve_xprt
,
2574 .release_xprt
= xs_tcp_release_xprt
,
2575 .alloc_slot
= xprt_lock_and_alloc_slot
,
2576 .rpcbind
= rpcb_getport_async
,
2577 .set_port
= xs_set_port
,
2578 .connect
= xs_connect
,
2579 .buf_alloc
= rpc_malloc
,
2580 .buf_free
= rpc_free
,
2581 .send_request
= xs_tcp_send_request
,
2582 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2583 .close
= xs_tcp_close
,
2584 .destroy
= xs_destroy
,
2585 .print_stats
= xs_tcp_print_stats
,
2589 * The rpc_xprt_ops for the server backchannel
2592 static struct rpc_xprt_ops bc_tcp_ops
= {
2593 .reserve_xprt
= xprt_reserve_xprt
,
2594 .release_xprt
= xprt_release_xprt
,
2595 .alloc_slot
= xprt_alloc_slot
,
2596 .buf_alloc
= bc_malloc
,
2597 .buf_free
= bc_free
,
2598 .send_request
= bc_send_request
,
2599 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2601 .destroy
= bc_destroy
,
2602 .print_stats
= xs_tcp_print_stats
,
2605 static int xs_init_anyaddr(const int family
, struct sockaddr
*sap
)
2607 static const struct sockaddr_in sin
= {
2608 .sin_family
= AF_INET
,
2609 .sin_addr
.s_addr
= htonl(INADDR_ANY
),
2611 static const struct sockaddr_in6 sin6
= {
2612 .sin6_family
= AF_INET6
,
2613 .sin6_addr
= IN6ADDR_ANY_INIT
,
2620 memcpy(sap
, &sin
, sizeof(sin
));
2623 memcpy(sap
, &sin6
, sizeof(sin6
));
2626 dprintk("RPC: %s: Bad address family\n", __func__
);
2627 return -EAFNOSUPPORT
;
2632 static struct rpc_xprt
*xs_setup_xprt(struct xprt_create
*args
,
2633 unsigned int slot_table_size
,
2634 unsigned int max_slot_table_size
)
2636 struct rpc_xprt
*xprt
;
2637 struct sock_xprt
*new;
2639 if (args
->addrlen
> sizeof(xprt
->addr
)) {
2640 dprintk("RPC: xs_setup_xprt: address too large\n");
2641 return ERR_PTR(-EBADF
);
2644 xprt
= xprt_alloc(args
->net
, sizeof(*new), slot_table_size
,
2645 max_slot_table_size
);
2647 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2649 return ERR_PTR(-ENOMEM
);
2652 new = container_of(xprt
, struct sock_xprt
, xprt
);
2653 memcpy(&xprt
->addr
, args
->dstaddr
, args
->addrlen
);
2654 xprt
->addrlen
= args
->addrlen
;
2656 memcpy(&new->srcaddr
, args
->srcaddr
, args
->addrlen
);
2659 err
= xs_init_anyaddr(args
->dstaddr
->sa_family
,
2660 (struct sockaddr
*)&new->srcaddr
);
2663 return ERR_PTR(err
);
2670 static const struct rpc_timeout xs_local_default_timeout
= {
2671 .to_initval
= 10 * HZ
,
2672 .to_maxval
= 10 * HZ
,
2677 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2678 * @args: rpc transport creation arguments
2680 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2682 static struct rpc_xprt
*xs_setup_local(struct xprt_create
*args
)
2684 struct sockaddr_un
*sun
= (struct sockaddr_un
*)args
->dstaddr
;
2685 struct sock_xprt
*transport
;
2686 struct rpc_xprt
*xprt
;
2687 struct rpc_xprt
*ret
;
2689 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2690 xprt_max_tcp_slot_table_entries
);
2693 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2696 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2697 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2699 xprt
->bind_timeout
= XS_BIND_TO
;
2700 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2701 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2703 xprt
->ops
= &xs_local_ops
;
2704 xprt
->timeout
= &xs_local_default_timeout
;
2706 INIT_DELAYED_WORK(&transport
->connect_worker
,
2707 xs_dummy_setup_socket
);
2709 switch (sun
->sun_family
) {
2711 if (sun
->sun_path
[0] != '/') {
2712 dprintk("RPC: bad AF_LOCAL address: %s\n",
2714 ret
= ERR_PTR(-EINVAL
);
2717 xprt_set_bound(xprt
);
2718 xs_format_peer_addresses(xprt
, "local", RPCBIND_NETID_LOCAL
);
2719 ret
= ERR_PTR(xs_local_setup_socket(transport
));
2724 ret
= ERR_PTR(-EAFNOSUPPORT
);
2728 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2729 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
2731 if (try_module_get(THIS_MODULE
))
2733 ret
= ERR_PTR(-EINVAL
);
2739 static const struct rpc_timeout xs_udp_default_timeout
= {
2740 .to_initval
= 5 * HZ
,
2741 .to_maxval
= 30 * HZ
,
2742 .to_increment
= 5 * HZ
,
2747 * xs_setup_udp - Set up transport to use a UDP socket
2748 * @args: rpc transport creation arguments
2751 static struct rpc_xprt
*xs_setup_udp(struct xprt_create
*args
)
2753 struct sockaddr
*addr
= args
->dstaddr
;
2754 struct rpc_xprt
*xprt
;
2755 struct sock_xprt
*transport
;
2756 struct rpc_xprt
*ret
;
2758 xprt
= xs_setup_xprt(args
, xprt_udp_slot_table_entries
,
2759 xprt_udp_slot_table_entries
);
2762 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2764 xprt
->prot
= IPPROTO_UDP
;
2766 /* XXX: header size can vary due to auth type, IPv6, etc. */
2767 xprt
->max_payload
= (1U << 16) - (MAX_HEADER
<< 3);
2769 xprt
->bind_timeout
= XS_BIND_TO
;
2770 xprt
->reestablish_timeout
= XS_UDP_REEST_TO
;
2771 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2773 xprt
->ops
= &xs_udp_ops
;
2775 xprt
->timeout
= &xs_udp_default_timeout
;
2777 switch (addr
->sa_family
) {
2779 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2780 xprt_set_bound(xprt
);
2782 INIT_DELAYED_WORK(&transport
->connect_worker
,
2783 xs_udp_setup_socket
);
2784 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP
);
2787 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2788 xprt_set_bound(xprt
);
2790 INIT_DELAYED_WORK(&transport
->connect_worker
,
2791 xs_udp_setup_socket
);
2792 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP6
);
2795 ret
= ERR_PTR(-EAFNOSUPPORT
);
2799 if (xprt_bound(xprt
))
2800 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2801 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2802 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2803 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2805 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2806 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2807 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2809 if (try_module_get(THIS_MODULE
))
2811 ret
= ERR_PTR(-EINVAL
);
2817 static const struct rpc_timeout xs_tcp_default_timeout
= {
2818 .to_initval
= 60 * HZ
,
2819 .to_maxval
= 60 * HZ
,
2824 * xs_setup_tcp - Set up transport to use a TCP socket
2825 * @args: rpc transport creation arguments
2828 static struct rpc_xprt
*xs_setup_tcp(struct xprt_create
*args
)
2830 struct sockaddr
*addr
= args
->dstaddr
;
2831 struct rpc_xprt
*xprt
;
2832 struct sock_xprt
*transport
;
2833 struct rpc_xprt
*ret
;
2834 unsigned int max_slot_table_size
= xprt_max_tcp_slot_table_entries
;
2836 if (args
->flags
& XPRT_CREATE_INFINITE_SLOTS
)
2837 max_slot_table_size
= RPC_MAX_SLOT_TABLE_LIMIT
;
2839 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2840 max_slot_table_size
);
2843 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2845 xprt
->prot
= IPPROTO_TCP
;
2846 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2847 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2849 xprt
->bind_timeout
= XS_BIND_TO
;
2850 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2851 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2853 xprt
->ops
= &xs_tcp_ops
;
2854 xprt
->timeout
= &xs_tcp_default_timeout
;
2856 switch (addr
->sa_family
) {
2858 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2859 xprt_set_bound(xprt
);
2861 INIT_DELAYED_WORK(&transport
->connect_worker
,
2862 xs_tcp_setup_socket
);
2863 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP
);
2866 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2867 xprt_set_bound(xprt
);
2869 INIT_DELAYED_WORK(&transport
->connect_worker
,
2870 xs_tcp_setup_socket
);
2871 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP6
);
2874 ret
= ERR_PTR(-EAFNOSUPPORT
);
2878 if (xprt_bound(xprt
))
2879 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2880 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2881 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2882 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2884 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2885 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2886 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2889 if (try_module_get(THIS_MODULE
))
2891 ret
= ERR_PTR(-EINVAL
);
2898 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2899 * @args: rpc transport creation arguments
2902 static struct rpc_xprt
*xs_setup_bc_tcp(struct xprt_create
*args
)
2904 struct sockaddr
*addr
= args
->dstaddr
;
2905 struct rpc_xprt
*xprt
;
2906 struct sock_xprt
*transport
;
2907 struct svc_sock
*bc_sock
;
2908 struct rpc_xprt
*ret
;
2910 if (args
->bc_xprt
->xpt_bc_xprt
) {
2912 * This server connection already has a backchannel
2913 * transport; we can't create a new one, as we wouldn't
2914 * be able to match replies based on xid any more. So,
2915 * reuse the already-existing one:
2917 return args
->bc_xprt
->xpt_bc_xprt
;
2919 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2920 xprt_tcp_slot_table_entries
);
2923 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2925 xprt
->prot
= IPPROTO_TCP
;
2926 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2927 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2928 xprt
->timeout
= &xs_tcp_default_timeout
;
2931 xprt_set_bound(xprt
);
2932 xprt
->bind_timeout
= 0;
2933 xprt
->reestablish_timeout
= 0;
2934 xprt
->idle_timeout
= 0;
2936 xprt
->ops
= &bc_tcp_ops
;
2938 switch (addr
->sa_family
) {
2940 xs_format_peer_addresses(xprt
, "tcp",
2944 xs_format_peer_addresses(xprt
, "tcp",
2945 RPCBIND_NETID_TCP6
);
2948 ret
= ERR_PTR(-EAFNOSUPPORT
);
2952 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2953 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2954 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2955 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2958 * Once we've associated a backchannel xprt with a connection,
2959 * we want to keep it around as long as the connection lasts,
2960 * in case we need to start using it for a backchannel again;
2961 * this reference won't be dropped until bc_xprt is destroyed.
2964 args
->bc_xprt
->xpt_bc_xprt
= xprt
;
2965 xprt
->bc_xprt
= args
->bc_xprt
;
2966 bc_sock
= container_of(args
->bc_xprt
, struct svc_sock
, sk_xprt
);
2967 transport
->sock
= bc_sock
->sk_sock
;
2968 transport
->inet
= bc_sock
->sk_sk
;
2971 * Since we don't want connections for the backchannel, we set
2972 * the xprt status to connected
2974 xprt_set_connected(xprt
);
2977 if (try_module_get(THIS_MODULE
))
2980 ret
= ERR_PTR(-EINVAL
);
2986 static struct xprt_class xs_local_transport
= {
2987 .list
= LIST_HEAD_INIT(xs_local_transport
.list
),
2988 .name
= "named UNIX socket",
2989 .owner
= THIS_MODULE
,
2990 .ident
= XPRT_TRANSPORT_LOCAL
,
2991 .setup
= xs_setup_local
,
2994 static struct xprt_class xs_udp_transport
= {
2995 .list
= LIST_HEAD_INIT(xs_udp_transport
.list
),
2997 .owner
= THIS_MODULE
,
2998 .ident
= XPRT_TRANSPORT_UDP
,
2999 .setup
= xs_setup_udp
,
3002 static struct xprt_class xs_tcp_transport
= {
3003 .list
= LIST_HEAD_INIT(xs_tcp_transport
.list
),
3005 .owner
= THIS_MODULE
,
3006 .ident
= XPRT_TRANSPORT_TCP
,
3007 .setup
= xs_setup_tcp
,
3010 static struct xprt_class xs_bc_tcp_transport
= {
3011 .list
= LIST_HEAD_INIT(xs_bc_tcp_transport
.list
),
3012 .name
= "tcp NFSv4.1 backchannel",
3013 .owner
= THIS_MODULE
,
3014 .ident
= XPRT_TRANSPORT_BC_TCP
,
3015 .setup
= xs_setup_bc_tcp
,
3019 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3022 int init_socket_xprt(void)
3025 if (!sunrpc_table_header
)
3026 sunrpc_table_header
= register_sysctl_table(sunrpc_table
);
3029 xprt_register_transport(&xs_local_transport
);
3030 xprt_register_transport(&xs_udp_transport
);
3031 xprt_register_transport(&xs_tcp_transport
);
3032 xprt_register_transport(&xs_bc_tcp_transport
);
3038 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3041 void cleanup_socket_xprt(void)
3044 if (sunrpc_table_header
) {
3045 unregister_sysctl_table(sunrpc_table_header
);
3046 sunrpc_table_header
= NULL
;
3050 xprt_unregister_transport(&xs_local_transport
);
3051 xprt_unregister_transport(&xs_udp_transport
);
3052 xprt_unregister_transport(&xs_tcp_transport
);
3053 xprt_unregister_transport(&xs_bc_tcp_transport
);
3056 static int param_set_uint_minmax(const char *val
,
3057 const struct kernel_param
*kp
,
3058 unsigned int min
, unsigned int max
)
3065 ret
= strict_strtoul(val
, 0, &num
);
3066 if (ret
== -EINVAL
|| num
< min
|| num
> max
)
3068 *((unsigned int *)kp
->arg
) = num
;
3072 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
3074 return param_set_uint_minmax(val
, kp
,
3079 static struct kernel_param_ops param_ops_portnr
= {
3080 .set
= param_set_portnr
,
3081 .get
= param_get_uint
,
3084 #define param_check_portnr(name, p) \
3085 __param_check(name, p, unsigned int);
3087 module_param_named(min_resvport
, xprt_min_resvport
, portnr
, 0644);
3088 module_param_named(max_resvport
, xprt_max_resvport
, portnr
, 0644);
3090 static int param_set_slot_table_size(const char *val
,
3091 const struct kernel_param
*kp
)
3093 return param_set_uint_minmax(val
, kp
,
3095 RPC_MAX_SLOT_TABLE
);
3098 static struct kernel_param_ops param_ops_slot_table_size
= {
3099 .set
= param_set_slot_table_size
,
3100 .get
= param_get_uint
,
3103 #define param_check_slot_table_size(name, p) \
3104 __param_check(name, p, unsigned int);
3106 static int param_set_max_slot_table_size(const char *val
,
3107 const struct kernel_param
*kp
)
3109 return param_set_uint_minmax(val
, kp
,
3111 RPC_MAX_SLOT_TABLE_LIMIT
);
3114 static struct kernel_param_ops param_ops_max_slot_table_size
= {
3115 .set
= param_set_max_slot_table_size
,
3116 .get
= param_get_uint
,
3119 #define param_check_max_slot_table_size(name, p) \
3120 __param_check(name, p, unsigned int);
3122 module_param_named(tcp_slot_table_entries
, xprt_tcp_slot_table_entries
,
3123 slot_table_size
, 0644);
3124 module_param_named(tcp_max_slot_table_entries
, xprt_max_tcp_slot_table_entries
,
3125 max_slot_table_size
, 0644);
3126 module_param_named(udp_slot_table_entries
, xprt_udp_slot_table_entries
,
3127 slot_table_size
, 0644);