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;
599 status
= xs_nospace(task
);
602 dprintk("RPC: sendmsg returned unrecognized error %d\n",
613 * xs_udp_send_request - write an RPC request to a UDP socket
614 * @task: address of RPC task that manages the state of an RPC request
617 * 0: The request has been sent
618 * EAGAIN: The socket was blocked, please call again later to
619 * complete the request
620 * ENOTCONN: Caller needs to invoke connect logic then call again
621 * other: Some other error occurred, the request was not sent
623 static int xs_udp_send_request(struct rpc_task
*task
)
625 struct rpc_rqst
*req
= task
->tk_rqstp
;
626 struct rpc_xprt
*xprt
= req
->rq_xprt
;
627 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
628 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
631 xs_pktdump("packet data:",
632 req
->rq_svec
->iov_base
,
633 req
->rq_svec
->iov_len
);
635 if (!xprt_bound(xprt
))
637 status
= xs_sendpages(transport
->sock
,
640 req
->rq_bytes_sent
, true);
642 dprintk("RPC: xs_udp_send_request(%u) = %d\n",
643 xdr
->len
- req
->rq_bytes_sent
, status
);
646 req
->rq_xmit_bytes_sent
+= status
;
647 if (status
>= req
->rq_slen
)
649 /* Still some bytes left; set up for a retry later. */
656 /* Should we call xs_close() here? */
659 status
= xs_nospace(task
);
662 dprintk("RPC: sendmsg returned unrecognized error %d\n",
668 /* When the server has died, an ICMP port unreachable message
669 * prompts ECONNREFUSED. */
670 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
677 * xs_tcp_shutdown - gracefully shut down a TCP socket
680 * Initiates a graceful shutdown of the TCP socket by calling the
681 * equivalent of shutdown(SHUT_WR);
683 static void xs_tcp_shutdown(struct rpc_xprt
*xprt
)
685 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
686 struct socket
*sock
= transport
->sock
;
689 kernel_sock_shutdown(sock
, SHUT_WR
);
690 trace_rpc_socket_shutdown(xprt
, sock
);
695 * xs_tcp_send_request - write an RPC request to a TCP socket
696 * @task: address of RPC task that manages the state of an RPC request
699 * 0: The request has been sent
700 * EAGAIN: The socket was blocked, please call again later to
701 * complete the request
702 * ENOTCONN: Caller needs to invoke connect logic then call again
703 * other: Some other error occurred, the request was not sent
705 * XXX: In the case of soft timeouts, should we eventually give up
706 * if sendmsg is not able to make progress?
708 static int xs_tcp_send_request(struct rpc_task
*task
)
710 struct rpc_rqst
*req
= task
->tk_rqstp
;
711 struct rpc_xprt
*xprt
= req
->rq_xprt
;
712 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
713 struct xdr_buf
*xdr
= &req
->rq_snd_buf
;
714 bool zerocopy
= true;
717 xs_encode_stream_record_marker(&req
->rq_snd_buf
);
719 xs_pktdump("packet data:",
720 req
->rq_svec
->iov_base
,
721 req
->rq_svec
->iov_len
);
722 /* Don't use zero copy if this is a resend. If the RPC call
723 * completes while the socket holds a reference to the pages,
724 * then we may end up resending corrupted data.
726 if (task
->tk_flags
& RPC_TASK_SENT
)
729 /* Continue transmitting the packet/record. We must be careful
730 * to cope with writespace callbacks arriving _after_ we have
731 * called sendmsg(). */
733 status
= xs_sendpages(transport
->sock
,
734 NULL
, 0, xdr
, req
->rq_bytes_sent
,
737 dprintk("RPC: xs_tcp_send_request(%u) = %d\n",
738 xdr
->len
- req
->rq_bytes_sent
, status
);
740 if (unlikely(status
< 0))
743 /* If we've sent the entire packet, immediately
744 * reset the count of bytes sent. */
745 req
->rq_bytes_sent
+= status
;
746 req
->rq_xmit_bytes_sent
+= status
;
747 if (likely(req
->rq_bytes_sent
>= req
->rq_slen
)) {
748 req
->rq_bytes_sent
= 0;
761 /* Should we call xs_close() here? */
765 status
= xs_nospace(task
);
768 dprintk("RPC: sendmsg returned unrecognized error %d\n",
771 xs_tcp_shutdown(xprt
);
775 clear_bit(SOCK_ASYNC_NOSPACE
, &transport
->sock
->flags
);
782 * xs_tcp_release_xprt - clean up after a tcp transmission
786 * This cleans up if an error causes us to abort the transmission of a request.
787 * In this case, the socket may need to be reset in order to avoid confusing
790 static void xs_tcp_release_xprt(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
792 struct rpc_rqst
*req
;
794 if (task
!= xprt
->snd_task
)
798 req
= task
->tk_rqstp
;
801 if (req
->rq_bytes_sent
== 0)
803 if (req
->rq_bytes_sent
== req
->rq_snd_buf
.len
)
805 set_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
807 xprt_release_xprt(xprt
, task
);
810 static void xs_save_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
812 transport
->old_data_ready
= sk
->sk_data_ready
;
813 transport
->old_state_change
= sk
->sk_state_change
;
814 transport
->old_write_space
= sk
->sk_write_space
;
815 transport
->old_error_report
= sk
->sk_error_report
;
818 static void xs_restore_old_callbacks(struct sock_xprt
*transport
, struct sock
*sk
)
820 sk
->sk_data_ready
= transport
->old_data_ready
;
821 sk
->sk_state_change
= transport
->old_state_change
;
822 sk
->sk_write_space
= transport
->old_write_space
;
823 sk
->sk_error_report
= transport
->old_error_report
;
827 * xs_error_report - callback to handle TCP socket state errors
830 * Note: we don't call sock_error() since there may be a rpc_task
831 * using the socket, and so we don't want to clear sk->sk_err.
833 static void xs_error_report(struct sock
*sk
)
835 struct rpc_xprt
*xprt
;
838 read_lock_bh(&sk
->sk_callback_lock
);
839 if (!(xprt
= xprt_from_sock(sk
)))
845 dprintk("RPC: xs_error_report client %p, error=%d...\n",
847 trace_rpc_socket_error(xprt
, sk
->sk_socket
, err
);
848 xprt_wake_pending_tasks(xprt
, err
);
850 read_unlock_bh(&sk
->sk_callback_lock
);
853 static void xs_reset_transport(struct sock_xprt
*transport
)
855 struct socket
*sock
= transport
->sock
;
856 struct sock
*sk
= transport
->inet
;
861 transport
->srcport
= 0;
863 write_lock_bh(&sk
->sk_callback_lock
);
864 transport
->inet
= NULL
;
865 transport
->sock
= NULL
;
867 sk
->sk_user_data
= NULL
;
869 xs_restore_old_callbacks(transport
, sk
);
870 write_unlock_bh(&sk
->sk_callback_lock
);
872 trace_rpc_socket_close(&transport
->xprt
, sock
);
877 * xs_close - close a socket
880 * This is used when all requests are complete; ie, no DRC state remains
881 * on the server we want to save.
883 * The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
884 * xs_reset_transport() zeroing the socket from underneath a writer.
886 static void xs_close(struct rpc_xprt
*xprt
)
888 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
890 dprintk("RPC: xs_close xprt %p\n", xprt
);
892 cancel_delayed_work_sync(&transport
->connect_worker
);
894 xs_reset_transport(transport
);
895 xprt
->reestablish_timeout
= 0;
897 smp_mb__before_atomic();
898 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
899 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
900 clear_bit(XPRT_CLOSING
, &xprt
->state
);
901 smp_mb__after_atomic();
902 xprt_disconnect_done(xprt
);
905 static void xs_tcp_close(struct rpc_xprt
*xprt
)
907 if (test_and_clear_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
))
910 xs_tcp_shutdown(xprt
);
913 static void xs_xprt_free(struct rpc_xprt
*xprt
)
915 xs_free_peer_addresses(xprt
);
920 * xs_destroy - prepare to shutdown a transport
921 * @xprt: doomed transport
924 static void xs_destroy(struct rpc_xprt
*xprt
)
926 dprintk("RPC: xs_destroy xprt %p\n", xprt
);
930 module_put(THIS_MODULE
);
933 static int xs_local_copy_to_xdr(struct xdr_buf
*xdr
, struct sk_buff
*skb
)
935 struct xdr_skb_reader desc
= {
937 .offset
= sizeof(rpc_fraghdr
),
938 .count
= skb
->len
- sizeof(rpc_fraghdr
),
941 if (xdr_partial_copy_from_skb(xdr
, 0, &desc
, xdr_skb_read_bits
) < 0)
949 * xs_local_data_ready - "data ready" callback for AF_LOCAL sockets
950 * @sk: socket with data to read
951 * @len: how much data to read
953 * Currently this assumes we can read the whole reply in a single gulp.
955 static void xs_local_data_ready(struct sock
*sk
)
957 struct rpc_task
*task
;
958 struct rpc_xprt
*xprt
;
959 struct rpc_rqst
*rovr
;
961 int err
, repsize
, copied
;
965 read_lock_bh(&sk
->sk_callback_lock
);
966 dprintk("RPC: %s...\n", __func__
);
967 xprt
= xprt_from_sock(sk
);
971 skb
= skb_recv_datagram(sk
, 0, 1, &err
);
975 repsize
= skb
->len
- sizeof(rpc_fraghdr
);
977 dprintk("RPC: impossible RPC reply size %d\n", repsize
);
981 /* Copy the XID from the skb... */
982 xp
= skb_header_pointer(skb
, sizeof(rpc_fraghdr
), sizeof(_xid
), &_xid
);
986 /* Look up and lock the request corresponding to the given XID */
987 spin_lock(&xprt
->transport_lock
);
988 rovr
= xprt_lookup_rqst(xprt
, *xp
);
991 task
= rovr
->rq_task
;
993 copied
= rovr
->rq_private_buf
.buflen
;
994 if (copied
> repsize
)
997 if (xs_local_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
998 dprintk("RPC: sk_buff copy failed\n");
1002 xprt_complete_rqst(task
, copied
);
1005 spin_unlock(&xprt
->transport_lock
);
1007 skb_free_datagram(sk
, skb
);
1009 read_unlock_bh(&sk
->sk_callback_lock
);
1013 * xs_udp_data_ready - "data ready" callback for UDP sockets
1014 * @sk: socket with data to read
1015 * @len: how much data to read
1018 static void xs_udp_data_ready(struct sock
*sk
)
1020 struct rpc_task
*task
;
1021 struct rpc_xprt
*xprt
;
1022 struct rpc_rqst
*rovr
;
1023 struct sk_buff
*skb
;
1024 int err
, repsize
, copied
;
1028 read_lock_bh(&sk
->sk_callback_lock
);
1029 dprintk("RPC: xs_udp_data_ready...\n");
1030 if (!(xprt
= xprt_from_sock(sk
)))
1033 if ((skb
= skb_recv_datagram(sk
, 0, 1, &err
)) == NULL
)
1036 repsize
= skb
->len
- sizeof(struct udphdr
);
1038 dprintk("RPC: impossible RPC reply size %d!\n", repsize
);
1042 /* Copy the XID from the skb... */
1043 xp
= skb_header_pointer(skb
, sizeof(struct udphdr
),
1044 sizeof(_xid
), &_xid
);
1048 /* Look up and lock the request corresponding to the given XID */
1049 spin_lock(&xprt
->transport_lock
);
1050 rovr
= xprt_lookup_rqst(xprt
, *xp
);
1053 task
= rovr
->rq_task
;
1055 if ((copied
= rovr
->rq_private_buf
.buflen
) > repsize
)
1058 /* Suck it into the iovec, verify checksum if not done by hw. */
1059 if (csum_partial_copy_to_xdr(&rovr
->rq_private_buf
, skb
)) {
1060 UDPX_INC_STATS_BH(sk
, UDP_MIB_INERRORS
);
1064 UDPX_INC_STATS_BH(sk
, UDP_MIB_INDATAGRAMS
);
1066 xprt_adjust_cwnd(xprt
, task
, copied
);
1067 xprt_complete_rqst(task
, copied
);
1070 spin_unlock(&xprt
->transport_lock
);
1072 skb_free_datagram(sk
, skb
);
1074 read_unlock_bh(&sk
->sk_callback_lock
);
1078 * Helper function to force a TCP close if the server is sending
1079 * junk and/or it has put us in CLOSE_WAIT
1081 static void xs_tcp_force_close(struct rpc_xprt
*xprt
)
1083 set_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
);
1084 xprt_force_disconnect(xprt
);
1087 static inline void xs_tcp_read_fraghdr(struct rpc_xprt
*xprt
, struct xdr_skb_reader
*desc
)
1089 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1093 p
= ((char *) &transport
->tcp_fraghdr
) + transport
->tcp_offset
;
1094 len
= sizeof(transport
->tcp_fraghdr
) - transport
->tcp_offset
;
1095 used
= xdr_skb_read_bits(desc
, p
, len
);
1096 transport
->tcp_offset
+= used
;
1100 transport
->tcp_reclen
= ntohl(transport
->tcp_fraghdr
);
1101 if (transport
->tcp_reclen
& RPC_LAST_STREAM_FRAGMENT
)
1102 transport
->tcp_flags
|= TCP_RCV_LAST_FRAG
;
1104 transport
->tcp_flags
&= ~TCP_RCV_LAST_FRAG
;
1105 transport
->tcp_reclen
&= RPC_FRAGMENT_SIZE_MASK
;
1107 transport
->tcp_flags
&= ~TCP_RCV_COPY_FRAGHDR
;
1108 transport
->tcp_offset
= 0;
1110 /* Sanity check of the record length */
1111 if (unlikely(transport
->tcp_reclen
< 8)) {
1112 dprintk("RPC: invalid TCP record fragment length\n");
1113 xs_tcp_force_close(xprt
);
1116 dprintk("RPC: reading TCP record fragment of length %d\n",
1117 transport
->tcp_reclen
);
1120 static void xs_tcp_check_fraghdr(struct sock_xprt
*transport
)
1122 if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1123 transport
->tcp_flags
|= TCP_RCV_COPY_FRAGHDR
;
1124 transport
->tcp_offset
= 0;
1125 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
) {
1126 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1127 transport
->tcp_flags
|= TCP_RCV_COPY_XID
;
1128 transport
->tcp_copied
= 0;
1133 static inline void xs_tcp_read_xid(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1138 len
= sizeof(transport
->tcp_xid
) - transport
->tcp_offset
;
1139 dprintk("RPC: reading XID (%Zu bytes)\n", len
);
1140 p
= ((char *) &transport
->tcp_xid
) + transport
->tcp_offset
;
1141 used
= xdr_skb_read_bits(desc
, p
, len
);
1142 transport
->tcp_offset
+= used
;
1145 transport
->tcp_flags
&= ~TCP_RCV_COPY_XID
;
1146 transport
->tcp_flags
|= TCP_RCV_READ_CALLDIR
;
1147 transport
->tcp_copied
= 4;
1148 dprintk("RPC: reading %s XID %08x\n",
1149 (transport
->tcp_flags
& TCP_RPC_REPLY
) ? "reply for"
1151 ntohl(transport
->tcp_xid
));
1152 xs_tcp_check_fraghdr(transport
);
1155 static inline void xs_tcp_read_calldir(struct sock_xprt
*transport
,
1156 struct xdr_skb_reader
*desc
)
1163 * We want transport->tcp_offset to be 8 at the end of this routine
1164 * (4 bytes for the xid and 4 bytes for the call/reply flag).
1165 * When this function is called for the first time,
1166 * transport->tcp_offset is 4 (after having already read the xid).
1168 offset
= transport
->tcp_offset
- sizeof(transport
->tcp_xid
);
1169 len
= sizeof(transport
->tcp_calldir
) - offset
;
1170 dprintk("RPC: reading CALL/REPLY flag (%Zu bytes)\n", len
);
1171 p
= ((char *) &transport
->tcp_calldir
) + offset
;
1172 used
= xdr_skb_read_bits(desc
, p
, len
);
1173 transport
->tcp_offset
+= used
;
1176 transport
->tcp_flags
&= ~TCP_RCV_READ_CALLDIR
;
1178 * We don't yet have the XDR buffer, so we will write the calldir
1179 * out after we get the buffer from the 'struct rpc_rqst'
1181 switch (ntohl(transport
->tcp_calldir
)) {
1183 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1184 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1185 transport
->tcp_flags
|= TCP_RPC_REPLY
;
1188 transport
->tcp_flags
|= TCP_RCV_COPY_CALLDIR
;
1189 transport
->tcp_flags
|= TCP_RCV_COPY_DATA
;
1190 transport
->tcp_flags
&= ~TCP_RPC_REPLY
;
1193 dprintk("RPC: invalid request message type\n");
1194 xs_tcp_force_close(&transport
->xprt
);
1196 xs_tcp_check_fraghdr(transport
);
1199 static inline void xs_tcp_read_common(struct rpc_xprt
*xprt
,
1200 struct xdr_skb_reader
*desc
,
1201 struct rpc_rqst
*req
)
1203 struct sock_xprt
*transport
=
1204 container_of(xprt
, struct sock_xprt
, xprt
);
1205 struct xdr_buf
*rcvbuf
;
1209 rcvbuf
= &req
->rq_private_buf
;
1211 if (transport
->tcp_flags
& TCP_RCV_COPY_CALLDIR
) {
1213 * Save the RPC direction in the XDR buffer
1215 memcpy(rcvbuf
->head
[0].iov_base
+ transport
->tcp_copied
,
1216 &transport
->tcp_calldir
,
1217 sizeof(transport
->tcp_calldir
));
1218 transport
->tcp_copied
+= sizeof(transport
->tcp_calldir
);
1219 transport
->tcp_flags
&= ~TCP_RCV_COPY_CALLDIR
;
1223 if (len
> transport
->tcp_reclen
- transport
->tcp_offset
) {
1224 struct xdr_skb_reader my_desc
;
1226 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1227 memcpy(&my_desc
, desc
, sizeof(my_desc
));
1228 my_desc
.count
= len
;
1229 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1230 &my_desc
, xdr_skb_read_bits
);
1234 r
= xdr_partial_copy_from_skb(rcvbuf
, transport
->tcp_copied
,
1235 desc
, xdr_skb_read_bits
);
1238 transport
->tcp_copied
+= r
;
1239 transport
->tcp_offset
+= r
;
1242 /* Error when copying to the receive buffer,
1243 * usually because we weren't able to allocate
1244 * additional buffer pages. All we can do now
1245 * is turn off TCP_RCV_COPY_DATA, so the request
1246 * will not receive any additional updates,
1248 * Any remaining data from this record will
1251 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1252 dprintk("RPC: XID %08x truncated request\n",
1253 ntohl(transport
->tcp_xid
));
1254 dprintk("RPC: xprt = %p, tcp_copied = %lu, "
1255 "tcp_offset = %u, tcp_reclen = %u\n",
1256 xprt
, transport
->tcp_copied
,
1257 transport
->tcp_offset
, transport
->tcp_reclen
);
1261 dprintk("RPC: XID %08x read %Zd bytes\n",
1262 ntohl(transport
->tcp_xid
), r
);
1263 dprintk("RPC: xprt = %p, tcp_copied = %lu, tcp_offset = %u, "
1264 "tcp_reclen = %u\n", xprt
, transport
->tcp_copied
,
1265 transport
->tcp_offset
, transport
->tcp_reclen
);
1267 if (transport
->tcp_copied
== req
->rq_private_buf
.buflen
)
1268 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1269 else if (transport
->tcp_offset
== transport
->tcp_reclen
) {
1270 if (transport
->tcp_flags
& TCP_RCV_LAST_FRAG
)
1271 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1276 * Finds the request corresponding to the RPC xid and invokes the common
1277 * tcp read code to read the data.
1279 static inline int xs_tcp_read_reply(struct rpc_xprt
*xprt
,
1280 struct xdr_skb_reader
*desc
)
1282 struct sock_xprt
*transport
=
1283 container_of(xprt
, struct sock_xprt
, xprt
);
1284 struct rpc_rqst
*req
;
1286 dprintk("RPC: read reply XID %08x\n", ntohl(transport
->tcp_xid
));
1288 /* Find and lock the request corresponding to this xid */
1289 spin_lock(&xprt
->transport_lock
);
1290 req
= xprt_lookup_rqst(xprt
, transport
->tcp_xid
);
1292 dprintk("RPC: XID %08x request not found!\n",
1293 ntohl(transport
->tcp_xid
));
1294 spin_unlock(&xprt
->transport_lock
);
1298 xs_tcp_read_common(xprt
, desc
, req
);
1300 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1301 xprt_complete_rqst(req
->rq_task
, transport
->tcp_copied
);
1303 spin_unlock(&xprt
->transport_lock
);
1307 #if defined(CONFIG_SUNRPC_BACKCHANNEL)
1309 * Obtains an rpc_rqst previously allocated and invokes the common
1310 * tcp read code to read the data. The result is placed in the callback
1312 * If we're unable to obtain the rpc_rqst we schedule the closing of the
1313 * connection and return -1.
1315 static int xs_tcp_read_callback(struct rpc_xprt
*xprt
,
1316 struct xdr_skb_reader
*desc
)
1318 struct sock_xprt
*transport
=
1319 container_of(xprt
, struct sock_xprt
, xprt
);
1320 struct rpc_rqst
*req
;
1322 /* Look up and lock the request corresponding to the given XID */
1323 spin_lock(&xprt
->transport_lock
);
1324 req
= xprt_lookup_bc_request(xprt
, transport
->tcp_xid
);
1326 spin_unlock(&xprt
->transport_lock
);
1327 printk(KERN_WARNING
"Callback slot table overflowed\n");
1328 xprt_force_disconnect(xprt
);
1332 dprintk("RPC: read callback XID %08x\n", ntohl(req
->rq_xid
));
1333 xs_tcp_read_common(xprt
, desc
, req
);
1335 if (!(transport
->tcp_flags
& TCP_RCV_COPY_DATA
))
1336 xprt_complete_bc_request(req
, transport
->tcp_copied
);
1337 spin_unlock(&xprt
->transport_lock
);
1342 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1343 struct xdr_skb_reader
*desc
)
1345 struct sock_xprt
*transport
=
1346 container_of(xprt
, struct sock_xprt
, xprt
);
1348 return (transport
->tcp_flags
& TCP_RPC_REPLY
) ?
1349 xs_tcp_read_reply(xprt
, desc
) :
1350 xs_tcp_read_callback(xprt
, desc
);
1353 static inline int _xs_tcp_read_data(struct rpc_xprt
*xprt
,
1354 struct xdr_skb_reader
*desc
)
1356 return xs_tcp_read_reply(xprt
, desc
);
1358 #endif /* CONFIG_SUNRPC_BACKCHANNEL */
1361 * Read data off the transport. This can be either an RPC_CALL or an
1362 * RPC_REPLY. Relay the processing to helper functions.
1364 static void xs_tcp_read_data(struct rpc_xprt
*xprt
,
1365 struct xdr_skb_reader
*desc
)
1367 struct sock_xprt
*transport
=
1368 container_of(xprt
, struct sock_xprt
, xprt
);
1370 if (_xs_tcp_read_data(xprt
, desc
) == 0)
1371 xs_tcp_check_fraghdr(transport
);
1374 * The transport_lock protects the request handling.
1375 * There's no need to hold it to update the tcp_flags.
1377 transport
->tcp_flags
&= ~TCP_RCV_COPY_DATA
;
1381 static inline void xs_tcp_read_discard(struct sock_xprt
*transport
, struct xdr_skb_reader
*desc
)
1385 len
= transport
->tcp_reclen
- transport
->tcp_offset
;
1386 if (len
> desc
->count
)
1389 desc
->offset
+= len
;
1390 transport
->tcp_offset
+= len
;
1391 dprintk("RPC: discarded %Zu bytes\n", len
);
1392 xs_tcp_check_fraghdr(transport
);
1395 static int xs_tcp_data_recv(read_descriptor_t
*rd_desc
, struct sk_buff
*skb
, unsigned int offset
, size_t len
)
1397 struct rpc_xprt
*xprt
= rd_desc
->arg
.data
;
1398 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1399 struct xdr_skb_reader desc
= {
1405 dprintk("RPC: xs_tcp_data_recv started\n");
1407 /* Read in a new fragment marker if necessary */
1408 /* Can we ever really expect to get completely empty fragments? */
1409 if (transport
->tcp_flags
& TCP_RCV_COPY_FRAGHDR
) {
1410 xs_tcp_read_fraghdr(xprt
, &desc
);
1413 /* Read in the xid if necessary */
1414 if (transport
->tcp_flags
& TCP_RCV_COPY_XID
) {
1415 xs_tcp_read_xid(transport
, &desc
);
1418 /* Read in the call/reply flag */
1419 if (transport
->tcp_flags
& TCP_RCV_READ_CALLDIR
) {
1420 xs_tcp_read_calldir(transport
, &desc
);
1423 /* Read in the request data */
1424 if (transport
->tcp_flags
& TCP_RCV_COPY_DATA
) {
1425 xs_tcp_read_data(xprt
, &desc
);
1428 /* Skip over any trailing bytes on short reads */
1429 xs_tcp_read_discard(transport
, &desc
);
1430 } while (desc
.count
);
1431 dprintk("RPC: xs_tcp_data_recv done\n");
1432 return len
- desc
.count
;
1436 * xs_tcp_data_ready - "data ready" callback for TCP sockets
1437 * @sk: socket with data to read
1438 * @bytes: how much data to read
1441 static void xs_tcp_data_ready(struct sock
*sk
)
1443 struct rpc_xprt
*xprt
;
1444 read_descriptor_t rd_desc
;
1447 dprintk("RPC: xs_tcp_data_ready...\n");
1449 read_lock_bh(&sk
->sk_callback_lock
);
1450 if (!(xprt
= xprt_from_sock(sk
)))
1452 /* Any data means we had a useful conversation, so
1453 * the we don't need to delay the next reconnect
1455 if (xprt
->reestablish_timeout
)
1456 xprt
->reestablish_timeout
= 0;
1458 /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */
1459 rd_desc
.arg
.data
= xprt
;
1461 rd_desc
.count
= 65536;
1462 read
= tcp_read_sock(sk
, &rd_desc
, xs_tcp_data_recv
);
1465 read_unlock_bh(&sk
->sk_callback_lock
);
1469 * Do the equivalent of linger/linger2 handling for dealing with
1470 * broken servers that don't close the socket in a timely
1473 static void xs_tcp_schedule_linger_timeout(struct rpc_xprt
*xprt
,
1474 unsigned long timeout
)
1476 struct sock_xprt
*transport
;
1478 if (xprt_test_and_set_connecting(xprt
))
1480 set_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1481 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1482 queue_delayed_work(rpciod_workqueue
, &transport
->connect_worker
,
1486 static void xs_tcp_cancel_linger_timeout(struct rpc_xprt
*xprt
)
1488 struct sock_xprt
*transport
;
1490 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1492 if (!test_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
) ||
1493 !cancel_delayed_work(&transport
->connect_worker
))
1495 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1496 xprt_clear_connecting(xprt
);
1499 static void xs_sock_reset_connection_flags(struct rpc_xprt
*xprt
)
1501 smp_mb__before_atomic();
1502 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1503 clear_bit(XPRT_CONNECTION_CLOSE
, &xprt
->state
);
1504 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1505 clear_bit(XPRT_CLOSING
, &xprt
->state
);
1506 smp_mb__after_atomic();
1509 static void xs_sock_mark_closed(struct rpc_xprt
*xprt
)
1511 xs_sock_reset_connection_flags(xprt
);
1512 /* Mark transport as closed and wake up all pending tasks */
1513 xprt_disconnect_done(xprt
);
1517 * xs_tcp_state_change - callback to handle TCP socket state changes
1518 * @sk: socket whose state has changed
1521 static void xs_tcp_state_change(struct sock
*sk
)
1523 struct rpc_xprt
*xprt
;
1525 read_lock_bh(&sk
->sk_callback_lock
);
1526 if (!(xprt
= xprt_from_sock(sk
)))
1528 dprintk("RPC: xs_tcp_state_change client %p...\n", xprt
);
1529 dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n",
1530 sk
->sk_state
, xprt_connected(xprt
),
1531 sock_flag(sk
, SOCK_DEAD
),
1532 sock_flag(sk
, SOCK_ZAPPED
),
1535 trace_rpc_socket_state_change(xprt
, sk
->sk_socket
);
1536 switch (sk
->sk_state
) {
1537 case TCP_ESTABLISHED
:
1538 spin_lock(&xprt
->transport_lock
);
1539 if (!xprt_test_and_set_connected(xprt
)) {
1540 struct sock_xprt
*transport
= container_of(xprt
,
1541 struct sock_xprt
, xprt
);
1543 /* Reset TCP record info */
1544 transport
->tcp_offset
= 0;
1545 transport
->tcp_reclen
= 0;
1546 transport
->tcp_copied
= 0;
1547 transport
->tcp_flags
=
1548 TCP_RCV_COPY_FRAGHDR
| TCP_RCV_COPY_XID
;
1549 xprt
->connect_cookie
++;
1551 xprt_wake_pending_tasks(xprt
, -EAGAIN
);
1553 spin_unlock(&xprt
->transport_lock
);
1556 /* The client initiated a shutdown of the socket */
1557 xprt
->connect_cookie
++;
1558 xprt
->reestablish_timeout
= 0;
1559 set_bit(XPRT_CLOSING
, &xprt
->state
);
1560 smp_mb__before_atomic();
1561 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1562 clear_bit(XPRT_CLOSE_WAIT
, &xprt
->state
);
1563 smp_mb__after_atomic();
1564 xs_tcp_schedule_linger_timeout(xprt
, xs_tcp_fin_timeout
);
1566 case TCP_CLOSE_WAIT
:
1567 /* The server initiated a shutdown of the socket */
1568 xprt
->connect_cookie
++;
1569 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1570 xs_tcp_force_close(xprt
);
1573 * If the server closed down the connection, make sure that
1574 * we back off before reconnecting
1576 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
1577 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
1580 set_bit(XPRT_CLOSING
, &xprt
->state
);
1581 xs_tcp_schedule_linger_timeout(xprt
, xs_tcp_fin_timeout
);
1582 smp_mb__before_atomic();
1583 clear_bit(XPRT_CONNECTED
, &xprt
->state
);
1584 smp_mb__after_atomic();
1587 xs_tcp_cancel_linger_timeout(xprt
);
1588 xs_sock_mark_closed(xprt
);
1591 read_unlock_bh(&sk
->sk_callback_lock
);
1594 static void xs_write_space(struct sock
*sk
)
1596 struct socket
*sock
;
1597 struct rpc_xprt
*xprt
;
1599 if (unlikely(!(sock
= sk
->sk_socket
)))
1601 clear_bit(SOCK_NOSPACE
, &sock
->flags
);
1603 if (unlikely(!(xprt
= xprt_from_sock(sk
))))
1605 if (test_and_clear_bit(SOCK_ASYNC_NOSPACE
, &sock
->flags
) == 0)
1608 xprt_write_space(xprt
);
1612 * xs_udp_write_space - callback invoked when socket buffer space
1614 * @sk: socket whose state has changed
1616 * Called when more output buffer space is available for this socket.
1617 * We try not to wake our writers until they can make "significant"
1618 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1619 * with a bunch of small requests.
1621 static void xs_udp_write_space(struct sock
*sk
)
1623 read_lock_bh(&sk
->sk_callback_lock
);
1625 /* from net/core/sock.c:sock_def_write_space */
1626 if (sock_writeable(sk
))
1629 read_unlock_bh(&sk
->sk_callback_lock
);
1633 * xs_tcp_write_space - callback invoked when socket buffer space
1635 * @sk: socket whose state has changed
1637 * Called when more output buffer space is available for this socket.
1638 * We try not to wake our writers until they can make "significant"
1639 * progress, otherwise we'll waste resources thrashing kernel_sendmsg
1640 * with a bunch of small requests.
1642 static void xs_tcp_write_space(struct sock
*sk
)
1644 read_lock_bh(&sk
->sk_callback_lock
);
1646 /* from net/core/stream.c:sk_stream_write_space */
1647 if (sk_stream_is_writeable(sk
))
1650 read_unlock_bh(&sk
->sk_callback_lock
);
1653 static void xs_udp_do_set_buffer_size(struct rpc_xprt
*xprt
)
1655 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1656 struct sock
*sk
= transport
->inet
;
1658 if (transport
->rcvsize
) {
1659 sk
->sk_userlocks
|= SOCK_RCVBUF_LOCK
;
1660 sk
->sk_rcvbuf
= transport
->rcvsize
* xprt
->max_reqs
* 2;
1662 if (transport
->sndsize
) {
1663 sk
->sk_userlocks
|= SOCK_SNDBUF_LOCK
;
1664 sk
->sk_sndbuf
= transport
->sndsize
* xprt
->max_reqs
* 2;
1665 sk
->sk_write_space(sk
);
1670 * xs_udp_set_buffer_size - set send and receive limits
1671 * @xprt: generic transport
1672 * @sndsize: requested size of send buffer, in bytes
1673 * @rcvsize: requested size of receive buffer, in bytes
1675 * Set socket send and receive buffer size limits.
1677 static void xs_udp_set_buffer_size(struct rpc_xprt
*xprt
, size_t sndsize
, size_t rcvsize
)
1679 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1681 transport
->sndsize
= 0;
1683 transport
->sndsize
= sndsize
+ 1024;
1684 transport
->rcvsize
= 0;
1686 transport
->rcvsize
= rcvsize
+ 1024;
1688 xs_udp_do_set_buffer_size(xprt
);
1692 * xs_udp_timer - called when a retransmit timeout occurs on a UDP transport
1693 * @task: task that timed out
1695 * Adjust the congestion window after a retransmit timeout has occurred.
1697 static void xs_udp_timer(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1699 xprt_adjust_cwnd(xprt
, task
, -ETIMEDOUT
);
1702 static unsigned short xs_get_random_port(void)
1704 unsigned short range
= xprt_max_resvport
- xprt_min_resvport
;
1705 unsigned short rand
= (unsigned short) prandom_u32() % range
;
1706 return rand
+ xprt_min_resvport
;
1710 * xs_set_port - reset the port number in the remote endpoint address
1711 * @xprt: generic transport
1712 * @port: new port number
1715 static void xs_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1717 dprintk("RPC: setting port for xprt %p to %u\n", xprt
, port
);
1719 rpc_set_port(xs_addr(xprt
), port
);
1720 xs_update_peer_port(xprt
);
1723 static unsigned short xs_get_srcport(struct sock_xprt
*transport
)
1725 unsigned short port
= transport
->srcport
;
1727 if (port
== 0 && transport
->xprt
.resvport
)
1728 port
= xs_get_random_port();
1732 static unsigned short xs_next_srcport(struct sock_xprt
*transport
, unsigned short port
)
1734 if (transport
->srcport
!= 0)
1735 transport
->srcport
= 0;
1736 if (!transport
->xprt
.resvport
)
1738 if (port
<= xprt_min_resvport
|| port
> xprt_max_resvport
)
1739 return xprt_max_resvport
;
1742 static int xs_bind(struct sock_xprt
*transport
, struct socket
*sock
)
1744 struct sockaddr_storage myaddr
;
1746 unsigned short port
= xs_get_srcport(transport
);
1747 unsigned short last
;
1749 memcpy(&myaddr
, &transport
->srcaddr
, transport
->xprt
.addrlen
);
1751 rpc_set_port((struct sockaddr
*)&myaddr
, port
);
1752 err
= kernel_bind(sock
, (struct sockaddr
*)&myaddr
,
1753 transport
->xprt
.addrlen
);
1757 transport
->srcport
= port
;
1761 port
= xs_next_srcport(transport
, port
);
1764 } while (err
== -EADDRINUSE
&& nloop
!= 2);
1766 if (myaddr
.ss_family
== AF_INET
)
1767 dprintk("RPC: %s %pI4:%u: %s (%d)\n", __func__
,
1768 &((struct sockaddr_in
*)&myaddr
)->sin_addr
,
1769 port
, err
? "failed" : "ok", err
);
1771 dprintk("RPC: %s %pI6:%u: %s (%d)\n", __func__
,
1772 &((struct sockaddr_in6
*)&myaddr
)->sin6_addr
,
1773 port
, err
? "failed" : "ok", err
);
1778 * We don't support autobind on AF_LOCAL sockets
1780 static void xs_local_rpcbind(struct rpc_task
*task
)
1783 xprt_set_bound(rcu_dereference(task
->tk_client
->cl_xprt
));
1787 static void xs_local_set_port(struct rpc_xprt
*xprt
, unsigned short port
)
1791 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1792 static struct lock_class_key xs_key
[2];
1793 static struct lock_class_key xs_slock_key
[2];
1795 static inline void xs_reclassify_socketu(struct socket
*sock
)
1797 struct sock
*sk
= sock
->sk
;
1799 sock_lock_init_class_and_name(sk
, "slock-AF_LOCAL-RPC",
1800 &xs_slock_key
[1], "sk_lock-AF_LOCAL-RPC", &xs_key
[1]);
1803 static inline void xs_reclassify_socket4(struct socket
*sock
)
1805 struct sock
*sk
= sock
->sk
;
1807 sock_lock_init_class_and_name(sk
, "slock-AF_INET-RPC",
1808 &xs_slock_key
[0], "sk_lock-AF_INET-RPC", &xs_key
[0]);
1811 static inline void xs_reclassify_socket6(struct socket
*sock
)
1813 struct sock
*sk
= sock
->sk
;
1815 sock_lock_init_class_and_name(sk
, "slock-AF_INET6-RPC",
1816 &xs_slock_key
[1], "sk_lock-AF_INET6-RPC", &xs_key
[1]);
1819 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1821 WARN_ON_ONCE(sock_owned_by_user(sock
->sk
));
1822 if (sock_owned_by_user(sock
->sk
))
1827 xs_reclassify_socketu(sock
);
1830 xs_reclassify_socket4(sock
);
1833 xs_reclassify_socket6(sock
);
1838 static inline void xs_reclassify_socketu(struct socket
*sock
)
1842 static inline void xs_reclassify_socket4(struct socket
*sock
)
1846 static inline void xs_reclassify_socket6(struct socket
*sock
)
1850 static inline void xs_reclassify_socket(int family
, struct socket
*sock
)
1855 static void xs_dummy_setup_socket(struct work_struct
*work
)
1859 static struct socket
*xs_create_sock(struct rpc_xprt
*xprt
,
1860 struct sock_xprt
*transport
, int family
, int type
, int protocol
)
1862 struct socket
*sock
;
1865 err
= __sock_create(xprt
->xprt_net
, family
, type
, protocol
, &sock
, 1);
1867 dprintk("RPC: can't create %d transport socket (%d).\n",
1871 xs_reclassify_socket(family
, sock
);
1873 err
= xs_bind(transport
, sock
);
1881 return ERR_PTR(err
);
1884 static int xs_local_finish_connecting(struct rpc_xprt
*xprt
,
1885 struct socket
*sock
)
1887 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
1890 if (!transport
->inet
) {
1891 struct sock
*sk
= sock
->sk
;
1893 write_lock_bh(&sk
->sk_callback_lock
);
1895 xs_save_old_callbacks(transport
, sk
);
1897 sk
->sk_user_data
= xprt
;
1898 sk
->sk_data_ready
= xs_local_data_ready
;
1899 sk
->sk_write_space
= xs_udp_write_space
;
1900 sk
->sk_error_report
= xs_error_report
;
1901 sk
->sk_allocation
= GFP_ATOMIC
;
1903 xprt_clear_connected(xprt
);
1905 /* Reset to new socket */
1906 transport
->sock
= sock
;
1907 transport
->inet
= sk
;
1909 write_unlock_bh(&sk
->sk_callback_lock
);
1912 /* Tell the socket layer to start connecting... */
1913 xprt
->stat
.connect_count
++;
1914 xprt
->stat
.connect_start
= jiffies
;
1915 return kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, 0);
1919 * xs_local_setup_socket - create AF_LOCAL socket, connect to a local endpoint
1920 * @xprt: RPC transport to connect
1921 * @transport: socket transport to connect
1922 * @create_sock: function to create a socket of the correct type
1924 static int xs_local_setup_socket(struct sock_xprt
*transport
)
1926 struct rpc_xprt
*xprt
= &transport
->xprt
;
1927 struct socket
*sock
;
1930 current
->flags
|= PF_FSTRANS
;
1932 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
1933 status
= __sock_create(xprt
->xprt_net
, AF_LOCAL
,
1934 SOCK_STREAM
, 0, &sock
, 1);
1936 dprintk("RPC: can't create AF_LOCAL "
1937 "transport socket (%d).\n", -status
);
1940 xs_reclassify_socketu(sock
);
1942 dprintk("RPC: worker connecting xprt %p via AF_LOCAL to %s\n",
1943 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1945 status
= xs_local_finish_connecting(xprt
, sock
);
1946 trace_rpc_socket_connect(xprt
, sock
, status
);
1949 dprintk("RPC: xprt %p connected to %s\n",
1950 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1951 xprt_set_connected(xprt
);
1955 dprintk("RPC: xprt %p: socket %s does not exist\n",
1956 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1959 dprintk("RPC: xprt %p: connection refused for %s\n",
1960 xprt
, xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1963 printk(KERN_ERR
"%s: unhandled error (%d) connecting to %s\n",
1965 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
1969 xprt_clear_connecting(xprt
);
1970 xprt_wake_pending_tasks(xprt
, status
);
1971 current
->flags
&= ~PF_FSTRANS
;
1975 static void xs_local_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
1977 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
1980 if (RPC_IS_ASYNC(task
)) {
1982 * We want the AF_LOCAL connect to be resolved in the
1983 * filesystem namespace of the process making the rpc
1984 * call. Thus we connect synchronously.
1986 * If we want to support asynchronous AF_LOCAL calls,
1987 * we'll need to figure out how to pass a namespace to
1990 rpc_exit(task
, -ENOTCONN
);
1993 ret
= xs_local_setup_socket(transport
);
1994 if (ret
&& !RPC_IS_SOFTCONN(task
))
1995 msleep_interruptible(15000);
1998 #ifdef CONFIG_SUNRPC_SWAP
1999 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
2001 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
2005 sk_set_memalloc(transport
->inet
);
2009 * xs_swapper - Tag this transport as being used for swap.
2010 * @xprt: transport to tag
2011 * @enable: enable/disable
2014 int xs_swapper(struct rpc_xprt
*xprt
, int enable
)
2016 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
,
2022 xs_set_memalloc(xprt
);
2023 } else if (xprt
->swapper
) {
2025 sk_clear_memalloc(transport
->inet
);
2030 EXPORT_SYMBOL_GPL(xs_swapper
);
2032 static void xs_set_memalloc(struct rpc_xprt
*xprt
)
2037 static void xs_udp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2039 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2041 if (!transport
->inet
) {
2042 struct sock
*sk
= sock
->sk
;
2044 write_lock_bh(&sk
->sk_callback_lock
);
2046 xs_save_old_callbacks(transport
, sk
);
2048 sk
->sk_user_data
= xprt
;
2049 sk
->sk_data_ready
= xs_udp_data_ready
;
2050 sk
->sk_write_space
= xs_udp_write_space
;
2051 sk
->sk_allocation
= GFP_ATOMIC
;
2053 xprt_set_connected(xprt
);
2055 /* Reset to new socket */
2056 transport
->sock
= sock
;
2057 transport
->inet
= sk
;
2059 xs_set_memalloc(xprt
);
2061 write_unlock_bh(&sk
->sk_callback_lock
);
2063 xs_udp_do_set_buffer_size(xprt
);
2066 static void xs_udp_setup_socket(struct work_struct
*work
)
2068 struct sock_xprt
*transport
=
2069 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2070 struct rpc_xprt
*xprt
= &transport
->xprt
;
2071 struct socket
*sock
= transport
->sock
;
2074 current
->flags
|= PF_FSTRANS
;
2076 /* Start by resetting any existing state */
2077 xs_reset_transport(transport
);
2078 sock
= xs_create_sock(xprt
, transport
,
2079 xs_addr(xprt
)->sa_family
, SOCK_DGRAM
, IPPROTO_UDP
);
2083 dprintk("RPC: worker connecting xprt %p via %s to "
2084 "%s (port %s)\n", xprt
,
2085 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2086 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2087 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2089 xs_udp_finish_connecting(xprt
, sock
);
2090 trace_rpc_socket_connect(xprt
, sock
, 0);
2093 xprt_clear_connecting(xprt
);
2094 xprt_wake_pending_tasks(xprt
, status
);
2095 current
->flags
&= ~PF_FSTRANS
;
2099 * We need to preserve the port number so the reply cache on the server can
2100 * find our cached RPC replies when we get around to reconnecting.
2102 static void xs_abort_connection(struct sock_xprt
*transport
)
2105 struct sockaddr any
;
2107 dprintk("RPC: disconnecting xprt %p to reuse port\n", transport
);
2110 * Disconnect the transport socket by doing a connect operation
2111 * with AF_UNSPEC. This should return immediately...
2113 memset(&any
, 0, sizeof(any
));
2114 any
.sa_family
= AF_UNSPEC
;
2115 result
= kernel_connect(transport
->sock
, &any
, sizeof(any
), 0);
2116 trace_rpc_socket_reset_connection(&transport
->xprt
,
2117 transport
->sock
, result
);
2119 xs_sock_reset_connection_flags(&transport
->xprt
);
2120 dprintk("RPC: AF_UNSPEC connect return code %d\n", result
);
2123 static void xs_tcp_reuse_connection(struct sock_xprt
*transport
)
2125 unsigned int state
= transport
->inet
->sk_state
;
2127 if (state
== TCP_CLOSE
&& transport
->sock
->state
== SS_UNCONNECTED
) {
2128 /* we don't need to abort the connection if the socket
2129 * hasn't undergone a shutdown
2131 if (transport
->inet
->sk_shutdown
== 0)
2133 dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
2134 __func__
, transport
->inet
->sk_shutdown
);
2136 if ((1 << state
) & (TCPF_ESTABLISHED
|TCPF_SYN_SENT
)) {
2137 /* we don't need to abort the connection if the socket
2138 * hasn't undergone a shutdown
2140 if (transport
->inet
->sk_shutdown
== 0)
2142 dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
2143 "sk_shutdown set to %d\n",
2144 __func__
, transport
->inet
->sk_shutdown
);
2146 xs_abort_connection(transport
);
2149 static int xs_tcp_finish_connecting(struct rpc_xprt
*xprt
, struct socket
*sock
)
2151 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2152 int ret
= -ENOTCONN
;
2154 if (!transport
->inet
) {
2155 struct sock
*sk
= sock
->sk
;
2156 unsigned int keepidle
= xprt
->timeout
->to_initval
/ HZ
;
2157 unsigned int keepcnt
= xprt
->timeout
->to_retries
+ 1;
2158 unsigned int opt_on
= 1;
2160 /* TCP Keepalive options */
2161 kernel_setsockopt(sock
, SOL_SOCKET
, SO_KEEPALIVE
,
2162 (char *)&opt_on
, sizeof(opt_on
));
2163 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPIDLE
,
2164 (char *)&keepidle
, sizeof(keepidle
));
2165 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPINTVL
,
2166 (char *)&keepidle
, sizeof(keepidle
));
2167 kernel_setsockopt(sock
, SOL_TCP
, TCP_KEEPCNT
,
2168 (char *)&keepcnt
, sizeof(keepcnt
));
2170 write_lock_bh(&sk
->sk_callback_lock
);
2172 xs_save_old_callbacks(transport
, sk
);
2174 sk
->sk_user_data
= xprt
;
2175 sk
->sk_data_ready
= xs_tcp_data_ready
;
2176 sk
->sk_state_change
= xs_tcp_state_change
;
2177 sk
->sk_write_space
= xs_tcp_write_space
;
2178 sk
->sk_error_report
= xs_error_report
;
2179 sk
->sk_allocation
= GFP_ATOMIC
;
2181 /* socket options */
2182 sk
->sk_userlocks
|= SOCK_BINDPORT_LOCK
;
2183 sock_reset_flag(sk
, SOCK_LINGER
);
2184 tcp_sk(sk
)->linger2
= 0;
2185 tcp_sk(sk
)->nonagle
|= TCP_NAGLE_OFF
;
2187 xprt_clear_connected(xprt
);
2189 /* Reset to new socket */
2190 transport
->sock
= sock
;
2191 transport
->inet
= sk
;
2193 write_unlock_bh(&sk
->sk_callback_lock
);
2196 if (!xprt_bound(xprt
))
2199 xs_set_memalloc(xprt
);
2201 /* Tell the socket layer to start connecting... */
2202 xprt
->stat
.connect_count
++;
2203 xprt
->stat
.connect_start
= jiffies
;
2204 ret
= kernel_connect(sock
, xs_addr(xprt
), xprt
->addrlen
, O_NONBLOCK
);
2209 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2210 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2217 * xs_tcp_setup_socket - create a TCP socket and connect to a remote endpoint
2218 * @xprt: RPC transport to connect
2219 * @transport: socket transport to connect
2220 * @create_sock: function to create a socket of the correct type
2222 * Invoked by a work queue tasklet.
2224 static void xs_tcp_setup_socket(struct work_struct
*work
)
2226 struct sock_xprt
*transport
=
2227 container_of(work
, struct sock_xprt
, connect_worker
.work
);
2228 struct socket
*sock
= transport
->sock
;
2229 struct rpc_xprt
*xprt
= &transport
->xprt
;
2232 current
->flags
|= PF_FSTRANS
;
2235 clear_bit(XPRT_CONNECTION_ABORT
, &xprt
->state
);
2236 sock
= xs_create_sock(xprt
, transport
,
2237 xs_addr(xprt
)->sa_family
, SOCK_STREAM
, IPPROTO_TCP
);
2239 status
= PTR_ERR(sock
);
2245 abort_and_exit
= test_and_clear_bit(XPRT_CONNECTION_ABORT
,
2247 /* "close" the socket, preserving the local port */
2248 xs_tcp_reuse_connection(transport
);
2254 dprintk("RPC: worker connecting xprt %p via %s to "
2255 "%s (port %s)\n", xprt
,
2256 xprt
->address_strings
[RPC_DISPLAY_PROTO
],
2257 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2258 xprt
->address_strings
[RPC_DISPLAY_PORT
]);
2260 status
= xs_tcp_finish_connecting(xprt
, sock
);
2261 trace_rpc_socket_connect(xprt
, sock
, status
);
2262 dprintk("RPC: %p connect status %d connected %d sock state %d\n",
2263 xprt
, -status
, xprt_connected(xprt
),
2264 sock
->sk
->sk_state
);
2267 printk("%s: connect returned unhandled error %d\n",
2269 case -EADDRNOTAVAIL
:
2270 /* We're probably in TIME_WAIT. Get rid of existing socket,
2273 xs_tcp_force_close(xprt
);
2278 xprt_clear_connecting(xprt
);
2279 current
->flags
&= ~PF_FSTRANS
;
2282 /* Happens, for instance, if the user specified a link
2283 * local IPv6 address without a scope-id.
2289 /* retry with existing socket, after a delay */
2295 xprt_clear_connecting(xprt
);
2296 xprt_wake_pending_tasks(xprt
, status
);
2297 current
->flags
&= ~PF_FSTRANS
;
2301 * xs_connect - connect a socket to a remote endpoint
2302 * @xprt: pointer to transport structure
2303 * @task: address of RPC task that manages state of connect request
2305 * TCP: If the remote end dropped the connection, delay reconnecting.
2307 * UDP socket connects are synchronous, but we use a work queue anyway
2308 * to guarantee that even unprivileged user processes can set up a
2309 * socket on a privileged port.
2311 * If a UDP socket connect fails, the delay behavior here prevents
2312 * retry floods (hard mounts).
2314 static void xs_connect(struct rpc_xprt
*xprt
, struct rpc_task
*task
)
2316 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2318 if (transport
->sock
!= NULL
&& !RPC_IS_SOFTCONN(task
)) {
2319 dprintk("RPC: xs_connect delayed xprt %p for %lu "
2321 xprt
, xprt
->reestablish_timeout
/ HZ
);
2322 queue_delayed_work(rpciod_workqueue
,
2323 &transport
->connect_worker
,
2324 xprt
->reestablish_timeout
);
2325 xprt
->reestablish_timeout
<<= 1;
2326 if (xprt
->reestablish_timeout
< XS_TCP_INIT_REEST_TO
)
2327 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2328 if (xprt
->reestablish_timeout
> XS_TCP_MAX_REEST_TO
)
2329 xprt
->reestablish_timeout
= XS_TCP_MAX_REEST_TO
;
2331 dprintk("RPC: xs_connect scheduled xprt %p\n", xprt
);
2332 queue_delayed_work(rpciod_workqueue
,
2333 &transport
->connect_worker
, 0);
2338 * xs_local_print_stats - display AF_LOCAL socket-specifc stats
2339 * @xprt: rpc_xprt struct containing statistics
2343 static void xs_local_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2347 if (xprt_connected(xprt
))
2348 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2350 seq_printf(seq
, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
2351 "%llu %llu %lu %llu %llu\n",
2352 xprt
->stat
.bind_count
,
2353 xprt
->stat
.connect_count
,
2354 xprt
->stat
.connect_time
,
2358 xprt
->stat
.bad_xids
,
2361 xprt
->stat
.max_slots
,
2362 xprt
->stat
.sending_u
,
2363 xprt
->stat
.pending_u
);
2367 * xs_udp_print_stats - display UDP socket-specifc stats
2368 * @xprt: rpc_xprt struct containing statistics
2372 static void xs_udp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2374 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2376 seq_printf(seq
, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
2379 xprt
->stat
.bind_count
,
2382 xprt
->stat
.bad_xids
,
2385 xprt
->stat
.max_slots
,
2386 xprt
->stat
.sending_u
,
2387 xprt
->stat
.pending_u
);
2391 * xs_tcp_print_stats - display TCP socket-specifc stats
2392 * @xprt: rpc_xprt struct containing statistics
2396 static void xs_tcp_print_stats(struct rpc_xprt
*xprt
, struct seq_file
*seq
)
2398 struct sock_xprt
*transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2401 if (xprt_connected(xprt
))
2402 idle_time
= (long)(jiffies
- xprt
->last_used
) / HZ
;
2404 seq_printf(seq
, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
2405 "%llu %llu %lu %llu %llu\n",
2407 xprt
->stat
.bind_count
,
2408 xprt
->stat
.connect_count
,
2409 xprt
->stat
.connect_time
,
2413 xprt
->stat
.bad_xids
,
2416 xprt
->stat
.max_slots
,
2417 xprt
->stat
.sending_u
,
2418 xprt
->stat
.pending_u
);
2422 * Allocate a bunch of pages for a scratch buffer for the rpc code. The reason
2423 * we allocate pages instead doing a kmalloc like rpc_malloc is because we want
2424 * to use the server side send routines.
2426 static void *bc_malloc(struct rpc_task
*task
, size_t size
)
2429 struct rpc_buffer
*buf
;
2431 WARN_ON_ONCE(size
> PAGE_SIZE
- sizeof(struct rpc_buffer
));
2432 if (size
> PAGE_SIZE
- sizeof(struct rpc_buffer
))
2435 page
= alloc_page(GFP_KERNEL
);
2439 buf
= page_address(page
);
2440 buf
->len
= PAGE_SIZE
;
2446 * Free the space allocated in the bc_alloc routine
2448 static void bc_free(void *buffer
)
2450 struct rpc_buffer
*buf
;
2455 buf
= container_of(buffer
, struct rpc_buffer
, data
);
2456 free_page((unsigned long)buf
);
2460 * Use the svc_sock to send the callback. Must be called with svsk->sk_mutex
2461 * held. Borrows heavily from svc_tcp_sendto and xs_tcp_send_request.
2463 static int bc_sendto(struct rpc_rqst
*req
)
2466 struct xdr_buf
*xbufp
= &req
->rq_snd_buf
;
2467 struct rpc_xprt
*xprt
= req
->rq_xprt
;
2468 struct sock_xprt
*transport
=
2469 container_of(xprt
, struct sock_xprt
, xprt
);
2470 struct socket
*sock
= transport
->sock
;
2471 unsigned long headoff
;
2472 unsigned long tailoff
;
2474 xs_encode_stream_record_marker(xbufp
);
2476 tailoff
= (unsigned long)xbufp
->tail
[0].iov_base
& ~PAGE_MASK
;
2477 headoff
= (unsigned long)xbufp
->head
[0].iov_base
& ~PAGE_MASK
;
2478 len
= svc_send_common(sock
, xbufp
,
2479 virt_to_page(xbufp
->head
[0].iov_base
), headoff
,
2480 xbufp
->tail
[0].iov_base
, tailoff
);
2482 if (len
!= xbufp
->len
) {
2483 printk(KERN_NOTICE
"Error sending entire callback!\n");
2491 * The send routine. Borrows from svc_send
2493 static int bc_send_request(struct rpc_task
*task
)
2495 struct rpc_rqst
*req
= task
->tk_rqstp
;
2496 struct svc_xprt
*xprt
;
2499 dprintk("sending request with xid: %08x\n", ntohl(req
->rq_xid
));
2501 * Get the server socket associated with this callback xprt
2503 xprt
= req
->rq_xprt
->bc_xprt
;
2506 * Grab the mutex to serialize data as the connection is shared
2507 * with the fore channel
2509 if (!mutex_trylock(&xprt
->xpt_mutex
)) {
2510 rpc_sleep_on(&xprt
->xpt_bc_pending
, task
, NULL
);
2511 if (!mutex_trylock(&xprt
->xpt_mutex
))
2513 rpc_wake_up_queued_task(&xprt
->xpt_bc_pending
, task
);
2515 if (test_bit(XPT_DEAD
, &xprt
->xpt_flags
))
2518 len
= bc_sendto(req
);
2519 mutex_unlock(&xprt
->xpt_mutex
);
2528 * The close routine. Since this is client initiated, we do nothing
2531 static void bc_close(struct rpc_xprt
*xprt
)
2536 * The xprt destroy routine. Again, because this connection is client
2537 * initiated, we do nothing
2540 static void bc_destroy(struct rpc_xprt
*xprt
)
2542 dprintk("RPC: bc_destroy xprt %p\n", xprt
);
2545 module_put(THIS_MODULE
);
2548 static struct rpc_xprt_ops xs_local_ops
= {
2549 .reserve_xprt
= xprt_reserve_xprt
,
2550 .release_xprt
= xs_tcp_release_xprt
,
2551 .alloc_slot
= xprt_alloc_slot
,
2552 .rpcbind
= xs_local_rpcbind
,
2553 .set_port
= xs_local_set_port
,
2554 .connect
= xs_local_connect
,
2555 .buf_alloc
= rpc_malloc
,
2556 .buf_free
= rpc_free
,
2557 .send_request
= xs_local_send_request
,
2558 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2560 .destroy
= xs_destroy
,
2561 .print_stats
= xs_local_print_stats
,
2564 static struct rpc_xprt_ops xs_udp_ops
= {
2565 .set_buffer_size
= xs_udp_set_buffer_size
,
2566 .reserve_xprt
= xprt_reserve_xprt_cong
,
2567 .release_xprt
= xprt_release_xprt_cong
,
2568 .alloc_slot
= xprt_alloc_slot
,
2569 .rpcbind
= rpcb_getport_async
,
2570 .set_port
= xs_set_port
,
2571 .connect
= xs_connect
,
2572 .buf_alloc
= rpc_malloc
,
2573 .buf_free
= rpc_free
,
2574 .send_request
= xs_udp_send_request
,
2575 .set_retrans_timeout
= xprt_set_retrans_timeout_rtt
,
2576 .timer
= xs_udp_timer
,
2577 .release_request
= xprt_release_rqst_cong
,
2579 .destroy
= xs_destroy
,
2580 .print_stats
= xs_udp_print_stats
,
2583 static struct rpc_xprt_ops xs_tcp_ops
= {
2584 .reserve_xprt
= xprt_reserve_xprt
,
2585 .release_xprt
= xs_tcp_release_xprt
,
2586 .alloc_slot
= xprt_lock_and_alloc_slot
,
2587 .rpcbind
= rpcb_getport_async
,
2588 .set_port
= xs_set_port
,
2589 .connect
= xs_connect
,
2590 .buf_alloc
= rpc_malloc
,
2591 .buf_free
= rpc_free
,
2592 .send_request
= xs_tcp_send_request
,
2593 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2594 .close
= xs_tcp_close
,
2595 .destroy
= xs_destroy
,
2596 .print_stats
= xs_tcp_print_stats
,
2600 * The rpc_xprt_ops for the server backchannel
2603 static struct rpc_xprt_ops bc_tcp_ops
= {
2604 .reserve_xprt
= xprt_reserve_xprt
,
2605 .release_xprt
= xprt_release_xprt
,
2606 .alloc_slot
= xprt_alloc_slot
,
2607 .buf_alloc
= bc_malloc
,
2608 .buf_free
= bc_free
,
2609 .send_request
= bc_send_request
,
2610 .set_retrans_timeout
= xprt_set_retrans_timeout_def
,
2612 .destroy
= bc_destroy
,
2613 .print_stats
= xs_tcp_print_stats
,
2616 static int xs_init_anyaddr(const int family
, struct sockaddr
*sap
)
2618 static const struct sockaddr_in sin
= {
2619 .sin_family
= AF_INET
,
2620 .sin_addr
.s_addr
= htonl(INADDR_ANY
),
2622 static const struct sockaddr_in6 sin6
= {
2623 .sin6_family
= AF_INET6
,
2624 .sin6_addr
= IN6ADDR_ANY_INIT
,
2631 memcpy(sap
, &sin
, sizeof(sin
));
2634 memcpy(sap
, &sin6
, sizeof(sin6
));
2637 dprintk("RPC: %s: Bad address family\n", __func__
);
2638 return -EAFNOSUPPORT
;
2643 static struct rpc_xprt
*xs_setup_xprt(struct xprt_create
*args
,
2644 unsigned int slot_table_size
,
2645 unsigned int max_slot_table_size
)
2647 struct rpc_xprt
*xprt
;
2648 struct sock_xprt
*new;
2650 if (args
->addrlen
> sizeof(xprt
->addr
)) {
2651 dprintk("RPC: xs_setup_xprt: address too large\n");
2652 return ERR_PTR(-EBADF
);
2655 xprt
= xprt_alloc(args
->net
, sizeof(*new), slot_table_size
,
2656 max_slot_table_size
);
2658 dprintk("RPC: xs_setup_xprt: couldn't allocate "
2660 return ERR_PTR(-ENOMEM
);
2663 new = container_of(xprt
, struct sock_xprt
, xprt
);
2664 memcpy(&xprt
->addr
, args
->dstaddr
, args
->addrlen
);
2665 xprt
->addrlen
= args
->addrlen
;
2667 memcpy(&new->srcaddr
, args
->srcaddr
, args
->addrlen
);
2670 err
= xs_init_anyaddr(args
->dstaddr
->sa_family
,
2671 (struct sockaddr
*)&new->srcaddr
);
2674 return ERR_PTR(err
);
2681 static const struct rpc_timeout xs_local_default_timeout
= {
2682 .to_initval
= 10 * HZ
,
2683 .to_maxval
= 10 * HZ
,
2688 * xs_setup_local - Set up transport to use an AF_LOCAL socket
2689 * @args: rpc transport creation arguments
2691 * AF_LOCAL is a "tpi_cots_ord" transport, just like TCP
2693 static struct rpc_xprt
*xs_setup_local(struct xprt_create
*args
)
2695 struct sockaddr_un
*sun
= (struct sockaddr_un
*)args
->dstaddr
;
2696 struct sock_xprt
*transport
;
2697 struct rpc_xprt
*xprt
;
2698 struct rpc_xprt
*ret
;
2700 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2701 xprt_max_tcp_slot_table_entries
);
2704 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2707 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2708 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2710 xprt
->bind_timeout
= XS_BIND_TO
;
2711 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2712 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2714 xprt
->ops
= &xs_local_ops
;
2715 xprt
->timeout
= &xs_local_default_timeout
;
2717 INIT_DELAYED_WORK(&transport
->connect_worker
,
2718 xs_dummy_setup_socket
);
2720 switch (sun
->sun_family
) {
2722 if (sun
->sun_path
[0] != '/') {
2723 dprintk("RPC: bad AF_LOCAL address: %s\n",
2725 ret
= ERR_PTR(-EINVAL
);
2728 xprt_set_bound(xprt
);
2729 xs_format_peer_addresses(xprt
, "local", RPCBIND_NETID_LOCAL
);
2730 ret
= ERR_PTR(xs_local_setup_socket(transport
));
2735 ret
= ERR_PTR(-EAFNOSUPPORT
);
2739 dprintk("RPC: set up xprt to %s via AF_LOCAL\n",
2740 xprt
->address_strings
[RPC_DISPLAY_ADDR
]);
2742 if (try_module_get(THIS_MODULE
))
2744 ret
= ERR_PTR(-EINVAL
);
2750 static const struct rpc_timeout xs_udp_default_timeout
= {
2751 .to_initval
= 5 * HZ
,
2752 .to_maxval
= 30 * HZ
,
2753 .to_increment
= 5 * HZ
,
2758 * xs_setup_udp - Set up transport to use a UDP socket
2759 * @args: rpc transport creation arguments
2762 static struct rpc_xprt
*xs_setup_udp(struct xprt_create
*args
)
2764 struct sockaddr
*addr
= args
->dstaddr
;
2765 struct rpc_xprt
*xprt
;
2766 struct sock_xprt
*transport
;
2767 struct rpc_xprt
*ret
;
2769 xprt
= xs_setup_xprt(args
, xprt_udp_slot_table_entries
,
2770 xprt_udp_slot_table_entries
);
2773 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2775 xprt
->prot
= IPPROTO_UDP
;
2777 /* XXX: header size can vary due to auth type, IPv6, etc. */
2778 xprt
->max_payload
= (1U << 16) - (MAX_HEADER
<< 3);
2780 xprt
->bind_timeout
= XS_BIND_TO
;
2781 xprt
->reestablish_timeout
= XS_UDP_REEST_TO
;
2782 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2784 xprt
->ops
= &xs_udp_ops
;
2786 xprt
->timeout
= &xs_udp_default_timeout
;
2788 switch (addr
->sa_family
) {
2790 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2791 xprt_set_bound(xprt
);
2793 INIT_DELAYED_WORK(&transport
->connect_worker
,
2794 xs_udp_setup_socket
);
2795 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP
);
2798 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2799 xprt_set_bound(xprt
);
2801 INIT_DELAYED_WORK(&transport
->connect_worker
,
2802 xs_udp_setup_socket
);
2803 xs_format_peer_addresses(xprt
, "udp", RPCBIND_NETID_UDP6
);
2806 ret
= ERR_PTR(-EAFNOSUPPORT
);
2810 if (xprt_bound(xprt
))
2811 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2812 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2813 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2814 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2816 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2817 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2818 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2820 if (try_module_get(THIS_MODULE
))
2822 ret
= ERR_PTR(-EINVAL
);
2828 static const struct rpc_timeout xs_tcp_default_timeout
= {
2829 .to_initval
= 60 * HZ
,
2830 .to_maxval
= 60 * HZ
,
2835 * xs_setup_tcp - Set up transport to use a TCP socket
2836 * @args: rpc transport creation arguments
2839 static struct rpc_xprt
*xs_setup_tcp(struct xprt_create
*args
)
2841 struct sockaddr
*addr
= args
->dstaddr
;
2842 struct rpc_xprt
*xprt
;
2843 struct sock_xprt
*transport
;
2844 struct rpc_xprt
*ret
;
2845 unsigned int max_slot_table_size
= xprt_max_tcp_slot_table_entries
;
2847 if (args
->flags
& XPRT_CREATE_INFINITE_SLOTS
)
2848 max_slot_table_size
= RPC_MAX_SLOT_TABLE_LIMIT
;
2850 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2851 max_slot_table_size
);
2854 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2856 xprt
->prot
= IPPROTO_TCP
;
2857 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2858 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2860 xprt
->bind_timeout
= XS_BIND_TO
;
2861 xprt
->reestablish_timeout
= XS_TCP_INIT_REEST_TO
;
2862 xprt
->idle_timeout
= XS_IDLE_DISC_TO
;
2864 xprt
->ops
= &xs_tcp_ops
;
2865 xprt
->timeout
= &xs_tcp_default_timeout
;
2867 switch (addr
->sa_family
) {
2869 if (((struct sockaddr_in
*)addr
)->sin_port
!= htons(0))
2870 xprt_set_bound(xprt
);
2872 INIT_DELAYED_WORK(&transport
->connect_worker
,
2873 xs_tcp_setup_socket
);
2874 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP
);
2877 if (((struct sockaddr_in6
*)addr
)->sin6_port
!= htons(0))
2878 xprt_set_bound(xprt
);
2880 INIT_DELAYED_WORK(&transport
->connect_worker
,
2881 xs_tcp_setup_socket
);
2882 xs_format_peer_addresses(xprt
, "tcp", RPCBIND_NETID_TCP6
);
2885 ret
= ERR_PTR(-EAFNOSUPPORT
);
2889 if (xprt_bound(xprt
))
2890 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2891 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2892 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2893 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2895 dprintk("RPC: set up xprt to %s (autobind) via %s\n",
2896 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2897 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2899 if (try_module_get(THIS_MODULE
))
2901 ret
= ERR_PTR(-EINVAL
);
2908 * xs_setup_bc_tcp - Set up transport to use a TCP backchannel socket
2909 * @args: rpc transport creation arguments
2912 static struct rpc_xprt
*xs_setup_bc_tcp(struct xprt_create
*args
)
2914 struct sockaddr
*addr
= args
->dstaddr
;
2915 struct rpc_xprt
*xprt
;
2916 struct sock_xprt
*transport
;
2917 struct svc_sock
*bc_sock
;
2918 struct rpc_xprt
*ret
;
2920 xprt
= xs_setup_xprt(args
, xprt_tcp_slot_table_entries
,
2921 xprt_tcp_slot_table_entries
);
2924 transport
= container_of(xprt
, struct sock_xprt
, xprt
);
2926 xprt
->prot
= IPPROTO_TCP
;
2927 xprt
->tsh_size
= sizeof(rpc_fraghdr
) / sizeof(u32
);
2928 xprt
->max_payload
= RPC_MAX_FRAGMENT_SIZE
;
2929 xprt
->timeout
= &xs_tcp_default_timeout
;
2932 xprt_set_bound(xprt
);
2933 xprt
->bind_timeout
= 0;
2934 xprt
->reestablish_timeout
= 0;
2935 xprt
->idle_timeout
= 0;
2937 xprt
->ops
= &bc_tcp_ops
;
2939 switch (addr
->sa_family
) {
2941 xs_format_peer_addresses(xprt
, "tcp",
2945 xs_format_peer_addresses(xprt
, "tcp",
2946 RPCBIND_NETID_TCP6
);
2949 ret
= ERR_PTR(-EAFNOSUPPORT
);
2953 dprintk("RPC: set up xprt to %s (port %s) via %s\n",
2954 xprt
->address_strings
[RPC_DISPLAY_ADDR
],
2955 xprt
->address_strings
[RPC_DISPLAY_PORT
],
2956 xprt
->address_strings
[RPC_DISPLAY_PROTO
]);
2959 * Once we've associated a backchannel xprt with a connection,
2960 * we want to keep it around as long as the connection lasts,
2961 * in case we need to start using it for a backchannel again;
2962 * this reference won't be dropped until bc_xprt is destroyed.
2965 args
->bc_xprt
->xpt_bc_xprt
= xprt
;
2966 xprt
->bc_xprt
= args
->bc_xprt
;
2967 bc_sock
= container_of(args
->bc_xprt
, struct svc_sock
, sk_xprt
);
2968 transport
->sock
= bc_sock
->sk_sock
;
2969 transport
->inet
= bc_sock
->sk_sk
;
2972 * Since we don't want connections for the backchannel, we set
2973 * the xprt status to connected
2975 xprt_set_connected(xprt
);
2977 if (try_module_get(THIS_MODULE
))
2980 args
->bc_xprt
->xpt_bc_xprt
= NULL
;
2982 ret
= ERR_PTR(-EINVAL
);
2988 static struct xprt_class xs_local_transport
= {
2989 .list
= LIST_HEAD_INIT(xs_local_transport
.list
),
2990 .name
= "named UNIX socket",
2991 .owner
= THIS_MODULE
,
2992 .ident
= XPRT_TRANSPORT_LOCAL
,
2993 .setup
= xs_setup_local
,
2996 static struct xprt_class xs_udp_transport
= {
2997 .list
= LIST_HEAD_INIT(xs_udp_transport
.list
),
2999 .owner
= THIS_MODULE
,
3000 .ident
= XPRT_TRANSPORT_UDP
,
3001 .setup
= xs_setup_udp
,
3004 static struct xprt_class xs_tcp_transport
= {
3005 .list
= LIST_HEAD_INIT(xs_tcp_transport
.list
),
3007 .owner
= THIS_MODULE
,
3008 .ident
= XPRT_TRANSPORT_TCP
,
3009 .setup
= xs_setup_tcp
,
3012 static struct xprt_class xs_bc_tcp_transport
= {
3013 .list
= LIST_HEAD_INIT(xs_bc_tcp_transport
.list
),
3014 .name
= "tcp NFSv4.1 backchannel",
3015 .owner
= THIS_MODULE
,
3016 .ident
= XPRT_TRANSPORT_BC_TCP
,
3017 .setup
= xs_setup_bc_tcp
,
3021 * init_socket_xprt - set up xprtsock's sysctls, register with RPC client
3024 int init_socket_xprt(void)
3027 if (!sunrpc_table_header
)
3028 sunrpc_table_header
= register_sysctl_table(sunrpc_table
);
3031 xprt_register_transport(&xs_local_transport
);
3032 xprt_register_transport(&xs_udp_transport
);
3033 xprt_register_transport(&xs_tcp_transport
);
3034 xprt_register_transport(&xs_bc_tcp_transport
);
3040 * cleanup_socket_xprt - remove xprtsock's sysctls, unregister
3043 void cleanup_socket_xprt(void)
3046 if (sunrpc_table_header
) {
3047 unregister_sysctl_table(sunrpc_table_header
);
3048 sunrpc_table_header
= NULL
;
3052 xprt_unregister_transport(&xs_local_transport
);
3053 xprt_unregister_transport(&xs_udp_transport
);
3054 xprt_unregister_transport(&xs_tcp_transport
);
3055 xprt_unregister_transport(&xs_bc_tcp_transport
);
3058 static int param_set_uint_minmax(const char *val
,
3059 const struct kernel_param
*kp
,
3060 unsigned int min
, unsigned int max
)
3067 ret
= kstrtouint(val
, 0, &num
);
3068 if (ret
== -EINVAL
|| num
< min
|| num
> max
)
3070 *((unsigned int *)kp
->arg
) = num
;
3074 static int param_set_portnr(const char *val
, const struct kernel_param
*kp
)
3076 return param_set_uint_minmax(val
, kp
,
3081 static struct kernel_param_ops param_ops_portnr
= {
3082 .set
= param_set_portnr
,
3083 .get
= param_get_uint
,
3086 #define param_check_portnr(name, p) \
3087 __param_check(name, p, unsigned int);
3089 module_param_named(min_resvport
, xprt_min_resvport
, portnr
, 0644);
3090 module_param_named(max_resvport
, xprt_max_resvport
, portnr
, 0644);
3092 static int param_set_slot_table_size(const char *val
,
3093 const struct kernel_param
*kp
)
3095 return param_set_uint_minmax(val
, kp
,
3097 RPC_MAX_SLOT_TABLE
);
3100 static struct kernel_param_ops param_ops_slot_table_size
= {
3101 .set
= param_set_slot_table_size
,
3102 .get
= param_get_uint
,
3105 #define param_check_slot_table_size(name, p) \
3106 __param_check(name, p, unsigned int);
3108 static int param_set_max_slot_table_size(const char *val
,
3109 const struct kernel_param
*kp
)
3111 return param_set_uint_minmax(val
, kp
,
3113 RPC_MAX_SLOT_TABLE_LIMIT
);
3116 static struct kernel_param_ops param_ops_max_slot_table_size
= {
3117 .set
= param_set_max_slot_table_size
,
3118 .get
= param_get_uint
,
3121 #define param_check_max_slot_table_size(name, p) \
3122 __param_check(name, p, unsigned int);
3124 module_param_named(tcp_slot_table_entries
, xprt_tcp_slot_table_entries
,
3125 slot_table_size
, 0644);
3126 module_param_named(tcp_max_slot_table_entries
, xprt_max_tcp_slot_table_entries
,
3127 max_slot_table_size
, 0644);
3128 module_param_named(udp_slot_table_entries
, xprt_udp_slot_table_entries
,
3129 slot_table_size
, 0644);