2 * linux/fs/9p/trans_fd.c
4 * Fd transport layer. Includes deprecated socket layer.
6 * Copyright (C) 2006 by Russ Cox <rsc@swtch.com>
7 * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
8 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
9 * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2
13 * as published by the Free Software Foundation.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to:
22 * Free Software Foundation
23 * 51 Franklin Street, Fifth Floor
24 * Boston, MA 02111-1301 USA
28 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
31 #include <linux/module.h>
32 #include <linux/net.h>
33 #include <linux/ipv6.h>
34 #include <linux/kthread.h>
35 #include <linux/errno.h>
36 #include <linux/kernel.h>
38 #include <linux/uaccess.h>
39 #include <linux/inet.h>
40 #include <linux/idr.h>
41 #include <linux/file.h>
42 #include <linux/parser.h>
43 #include <linux/slab.h>
44 #include <linux/seq_file.h>
45 #include <net/9p/9p.h>
46 #include <net/9p/client.h>
47 #include <net/9p/transport.h>
49 #include <linux/syscalls.h> /* killme */
52 #define MAX_SOCK_BUF (64*1024)
53 #define MAXPOLLWADDR 2
55 static struct p9_trans_module p9_tcp_trans;
56 static struct p9_trans_module p9_fd_trans;
59 * struct p9_fd_opts - per-transport options
60 * @rfd: file descriptor for reading (trans=fd)
61 * @wfd: file descriptor for writing (trans=fd)
62 * @port: port to connect to (trans=tcp)
74 * Option Parsing (code inspired by NFS code)
75 * - a little lazy - parse all fd-transport options
79 /* Options that take integer arguments */
80 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
81 /* Options that take no arguments */
85 static const match_table_t tokens = {
86 {Opt_port, "port=%u"},
87 {Opt_rfdno, "rfdno=%u"},
88 {Opt_wfdno, "wfdno=%u"},
89 {Opt_privport, "privport"},
94 Rworksched = 1, /* read work scheduled or running */
95 Rpending = 2, /* can read */
96 Wworksched = 4, /* write work scheduled or running */
97 Wpending = 8, /* can write */
100 struct p9_poll_wait {
101 struct p9_conn *conn;
102 wait_queue_entry_t wait;
103 wait_queue_head_t *wait_addr;
107 * struct p9_conn - fd mux connection state information
108 * @mux_list: list link for mux to manage multiple connections (?)
109 * @client: reference to client instance for this connection
111 * @req_list: accounting for requests which have been sent
112 * @unsent_req_list: accounting for requests that haven't been sent
113 * @req: current request being processed (if any)
114 * @tmp_buf: temporary buffer to read in header
115 * @rc: temporary fcall for reading current frame
116 * @wpos: write position for current frame
117 * @wsize: amount of data to write for current frame
118 * @wbuf: current write buffer
119 * @poll_pending_link: pending links to be polled per conn
120 * @poll_wait: array of wait_q's for various worker threads
122 * @rq: current read work
123 * @wq: current write work
129 struct list_head mux_list;
130 struct p9_client *client;
132 struct list_head req_list;
133 struct list_head unsent_req_list;
134 struct p9_req_t *req;
135 struct p9_req_t *wreq;
141 struct list_head poll_pending_link;
142 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
144 struct work_struct rq;
145 struct work_struct wq;
146 unsigned long wsched;
150 * struct p9_trans_fd - transport state
151 * @rd: reference to file to read from
152 * @wr: reference of file to write to
153 * @conn: connection state reference
163 static void p9_poll_workfn(struct work_struct *work);
165 static DEFINE_SPINLOCK(p9_poll_lock);
166 static LIST_HEAD(p9_poll_pending_list);
167 static DECLARE_WORK(p9_poll_work, p9_poll_workfn);
169 static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT;
170 static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT;
172 static void p9_mux_poll_stop(struct p9_conn *m)
177 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
178 struct p9_poll_wait *pwait = &m->poll_wait[i];
180 if (pwait->wait_addr) {
181 remove_wait_queue(pwait->wait_addr, &pwait->wait);
182 pwait->wait_addr = NULL;
186 spin_lock_irqsave(&p9_poll_lock, flags);
187 list_del_init(&m->poll_pending_link);
188 spin_unlock_irqrestore(&p9_poll_lock, flags);
190 flush_work(&p9_poll_work);
194 * p9_conn_cancel - cancel all pending requests with error
200 static void p9_conn_cancel(struct p9_conn *m, int err)
202 struct p9_req_t *req, *rtmp;
203 LIST_HEAD(cancel_list);
205 p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
207 spin_lock(&m->client->lock);
210 spin_unlock(&m->client->lock);
216 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
217 list_move(&req->req_list, &cancel_list);
219 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
220 list_move(&req->req_list, &cancel_list);
223 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
224 p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req);
225 list_del(&req->req_list);
228 p9_client_cb(m->client, req, REQ_STATUS_ERROR);
230 spin_unlock(&m->client->lock);
234 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt, int *err)
237 struct p9_trans_fd *ts = NULL;
239 if (client && client->status == Connected)
248 ret = vfs_poll(ts->rd, pt);
249 if (ts->rd != ts->wr)
250 ret = (ret & ~EPOLLOUT) | (vfs_poll(ts->wr, pt) & ~EPOLLIN);
255 * p9_fd_read- read from a fd
256 * @client: client instance
257 * @v: buffer to receive data into
258 * @len: size of receive buffer
262 static int p9_fd_read(struct p9_client *client, void *v, int len)
265 struct p9_trans_fd *ts = NULL;
268 if (client && client->status != Disconnected)
274 if (!(ts->rd->f_flags & O_NONBLOCK))
275 p9_debug(P9_DEBUG_ERROR, "blocking read ...\n");
278 ret = kernel_read(ts->rd, v, len, &pos);
279 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
280 client->status = Disconnected;
285 * p9_read_work - called when there is some data to be read from a transport
286 * @work: container of work to be done
290 static void p9_read_work(struct work_struct *work)
295 int status = REQ_STATUS_ERROR;
297 m = container_of(work, struct p9_conn, rq);
302 p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset);
305 m->rc.sdata = m->tmp_buf;
307 m->rc.capacity = 7; /* start by reading header */
310 clear_bit(Rpending, &m->wsched);
311 p9_debug(P9_DEBUG_TRANS, "read mux %p pos %zd size: %zd = %zd\n",
312 m, m->rc.offset, m->rc.capacity,
313 m->rc.capacity - m->rc.offset);
314 err = p9_fd_read(m->client, m->rc.sdata + m->rc.offset,
315 m->rc.capacity - m->rc.offset);
316 p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err);
326 if ((!m->req) && (m->rc.offset == m->rc.capacity)) {
327 p9_debug(P9_DEBUG_TRANS, "got new header\n");
331 err = p9_parse_header(&m->rc, &m->rc.size, NULL, NULL, 0);
333 p9_debug(P9_DEBUG_ERROR,
334 "error parsing header: %d\n", err);
338 if (m->rc.size >= m->client->msize) {
339 p9_debug(P9_DEBUG_ERROR,
340 "requested packet size too big: %d\n",
346 p9_debug(P9_DEBUG_TRANS,
347 "mux %p pkt: size: %d bytes tag: %d\n",
348 m, m->rc.size, m->rc.tag);
350 m->req = p9_tag_lookup(m->client, m->rc.tag);
351 if (!m->req || (m->req->status != REQ_STATUS_SENT)) {
352 p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
358 if (!m->req->rc.sdata) {
359 p9_debug(P9_DEBUG_ERROR,
360 "No recv fcall for tag %d (req %p), disconnecting!\n",
366 m->rc.sdata = m->req->rc.sdata;
367 memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity);
368 m->rc.capacity = m->rc.size;
372 * not an else because some packets (like clunk) have no payload
374 if ((m->req) && (m->rc.offset == m->rc.capacity)) {
375 p9_debug(P9_DEBUG_TRANS, "got new packet\n");
376 m->req->rc.size = m->rc.offset;
377 spin_lock(&m->client->lock);
378 if (m->req->status != REQ_STATUS_ERROR)
379 status = REQ_STATUS_RCVD;
380 list_del(&m->req->req_list);
381 /* update req->status while holding client->lock */
382 p9_client_cb(m->client, m->req, status);
383 spin_unlock(&m->client->lock);
392 clear_bit(Rworksched, &m->wsched);
394 if (!list_empty(&m->req_list)) {
395 if (test_and_clear_bit(Rpending, &m->wsched))
398 n = p9_fd_poll(m->client, NULL, NULL);
400 if ((n & EPOLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) {
401 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
402 schedule_work(&m->rq);
408 p9_conn_cancel(m, err);
409 clear_bit(Rworksched, &m->wsched);
413 * p9_fd_write - write to a socket
414 * @client: client instance
415 * @v: buffer to send data from
416 * @len: size of send buffer
420 static int p9_fd_write(struct p9_client *client, void *v, int len)
423 struct p9_trans_fd *ts = NULL;
425 if (client && client->status != Disconnected)
431 if (!(ts->wr->f_flags & O_NONBLOCK))
432 p9_debug(P9_DEBUG_ERROR, "blocking write ...\n");
434 ret = kernel_write(ts->wr, v, len, &ts->wr->f_pos);
435 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
436 client->status = Disconnected;
441 * p9_write_work - called when a transport can send some data
442 * @work: container for work to be done
446 static void p9_write_work(struct work_struct *work)
451 struct p9_req_t *req;
453 m = container_of(work, struct p9_conn, wq);
456 clear_bit(Wworksched, &m->wsched);
461 spin_lock(&m->client->lock);
462 if (list_empty(&m->unsent_req_list)) {
463 clear_bit(Wworksched, &m->wsched);
464 spin_unlock(&m->client->lock);
468 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
470 req->status = REQ_STATUS_SENT;
471 p9_debug(P9_DEBUG_TRANS, "move req %p\n", req);
472 list_move_tail(&req->req_list, &m->req_list);
474 m->wbuf = req->tc.sdata;
475 m->wsize = req->tc.size;
479 spin_unlock(&m->client->lock);
482 p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n",
483 m, m->wpos, m->wsize);
484 clear_bit(Wpending, &m->wsched);
485 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
486 p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);
499 if (m->wpos == m->wsize) {
500 m->wpos = m->wsize = 0;
506 clear_bit(Wworksched, &m->wsched);
508 if (m->wsize || !list_empty(&m->unsent_req_list)) {
509 if (test_and_clear_bit(Wpending, &m->wsched))
512 n = p9_fd_poll(m->client, NULL, NULL);
514 if ((n & EPOLLOUT) &&
515 !test_and_set_bit(Wworksched, &m->wsched)) {
516 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
517 schedule_work(&m->wq);
524 p9_conn_cancel(m, err);
525 clear_bit(Wworksched, &m->wsched);
528 static int p9_pollwake(wait_queue_entry_t *wait, unsigned int mode, int sync, void *key)
530 struct p9_poll_wait *pwait =
531 container_of(wait, struct p9_poll_wait, wait);
532 struct p9_conn *m = pwait->conn;
535 spin_lock_irqsave(&p9_poll_lock, flags);
536 if (list_empty(&m->poll_pending_link))
537 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
538 spin_unlock_irqrestore(&p9_poll_lock, flags);
540 schedule_work(&p9_poll_work);
545 * p9_pollwait - add poll task to the wait queue
546 * @filp: file pointer being polled
547 * @wait_address: wait_q to block on
550 * called by files poll operation to add v9fs-poll task to files wait queue
554 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
556 struct p9_conn *m = container_of(p, struct p9_conn, pt);
557 struct p9_poll_wait *pwait = NULL;
560 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
561 if (m->poll_wait[i].wait_addr == NULL) {
562 pwait = &m->poll_wait[i];
568 p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n");
573 pwait->wait_addr = wait_address;
574 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
575 add_wait_queue(wait_address, &pwait->wait);
579 * p9_conn_create - initialize the per-session mux data
580 * @client: client instance
582 * Note: Creates the polling task if this is the first session.
585 static void p9_conn_create(struct p9_client *client)
588 struct p9_trans_fd *ts = client->trans;
589 struct p9_conn *m = &ts->conn;
591 p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize);
593 INIT_LIST_HEAD(&m->mux_list);
596 INIT_LIST_HEAD(&m->req_list);
597 INIT_LIST_HEAD(&m->unsent_req_list);
598 INIT_WORK(&m->rq, p9_read_work);
599 INIT_WORK(&m->wq, p9_write_work);
600 INIT_LIST_HEAD(&m->poll_pending_link);
601 init_poll_funcptr(&m->pt, p9_pollwait);
603 n = p9_fd_poll(client, &m->pt, NULL);
605 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
606 set_bit(Rpending, &m->wsched);
610 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
611 set_bit(Wpending, &m->wsched);
616 * p9_poll_mux - polls a mux and schedules read or write works if necessary
617 * @m: connection to poll
621 static void p9_poll_mux(struct p9_conn *m)
624 int err = -ECONNRESET;
629 n = p9_fd_poll(m->client, NULL, &err);
630 if (n & (EPOLLERR | EPOLLHUP | EPOLLNVAL)) {
631 p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);
632 p9_conn_cancel(m, err);
636 set_bit(Rpending, &m->wsched);
637 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
638 if (!test_and_set_bit(Rworksched, &m->wsched)) {
639 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
640 schedule_work(&m->rq);
645 set_bit(Wpending, &m->wsched);
646 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
647 if ((m->wsize || !list_empty(&m->unsent_req_list)) &&
648 !test_and_set_bit(Wworksched, &m->wsched)) {
649 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
650 schedule_work(&m->wq);
656 * p9_fd_request - send 9P request
657 * The function can sleep until the request is scheduled for sending.
658 * The function can be interrupted. Return from the function is not
659 * a guarantee that the request is sent successfully.
661 * @client: client instance
662 * @req: request to be sent
666 static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
669 struct p9_trans_fd *ts = client->trans;
670 struct p9_conn *m = &ts->conn;
672 p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n",
673 m, current, &req->tc, req->tc.id);
677 spin_lock(&client->lock);
678 req->status = REQ_STATUS_UNSENT;
679 list_add_tail(&req->req_list, &m->unsent_req_list);
680 spin_unlock(&client->lock);
682 if (test_and_clear_bit(Wpending, &m->wsched))
685 n = p9_fd_poll(m->client, NULL, NULL);
687 if (n & EPOLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
688 schedule_work(&m->wq);
693 static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
697 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
699 spin_lock(&client->lock);
701 if (req->status == REQ_STATUS_UNSENT) {
702 list_del(&req->req_list);
703 req->status = REQ_STATUS_FLSHD;
707 spin_unlock(&client->lock);
712 static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req)
714 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
716 /* we haven't received a response for oldreq,
717 * remove it from the list.
719 spin_lock(&client->lock);
720 list_del(&req->req_list);
721 spin_unlock(&client->lock);
727 static int p9_fd_show_options(struct seq_file *m, struct p9_client *clnt)
729 if (clnt->trans_mod == &p9_tcp_trans) {
730 if (clnt->trans_opts.tcp.port != P9_PORT)
731 seq_printf(m, ",port=%u", clnt->trans_opts.tcp.port);
732 } else if (clnt->trans_mod == &p9_fd_trans) {
733 if (clnt->trans_opts.fd.rfd != ~0)
734 seq_printf(m, ",rfd=%u", clnt->trans_opts.fd.rfd);
735 if (clnt->trans_opts.fd.wfd != ~0)
736 seq_printf(m, ",wfd=%u", clnt->trans_opts.fd.wfd);
742 * parse_opts - parse mount options into p9_fd_opts structure
743 * @params: options string passed from mount
744 * @opts: fd transport-specific structure to parse options into
746 * Returns 0 upon success, -ERRNO upon failure
749 static int parse_opts(char *params, struct p9_fd_opts *opts)
752 substring_t args[MAX_OPT_ARGS];
754 char *options, *tmp_options;
756 opts->port = P9_PORT;
759 opts->privport = false;
764 tmp_options = kstrdup(params, GFP_KERNEL);
766 p9_debug(P9_DEBUG_ERROR,
767 "failed to allocate copy of option string\n");
770 options = tmp_options;
772 while ((p = strsep(&options, ",")) != NULL) {
777 token = match_token(p, tokens, args);
778 if ((token != Opt_err) && (token != Opt_privport)) {
779 r = match_int(&args[0], &option);
781 p9_debug(P9_DEBUG_ERROR,
782 "integer field, but no integer?\n");
797 opts->privport = true;
808 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
810 struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd),
817 if (!ts->rd || !ts->wr) {
827 client->status = Connected;
832 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
834 struct p9_trans_fd *p;
837 p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL);
841 csocket->sk->sk_allocation = GFP_NOIO;
842 file = sock_alloc_file(csocket, 0, NULL);
844 pr_err("%s (%d): failed to map fd\n",
845 __func__, task_pid_nr(current));
847 return PTR_ERR(file);
851 p->wr = p->rd = file;
853 client->status = Connected;
855 p->rd->f_flags |= O_NONBLOCK;
857 p9_conn_create(client);
862 * p9_mux_destroy - cancels all pending requests of mux
867 static void p9_conn_destroy(struct p9_conn *m)
869 p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n",
870 m, m->mux_list.prev, m->mux_list.next);
873 cancel_work_sync(&m->rq);
874 cancel_work_sync(&m->wq);
876 p9_conn_cancel(m, -ECONNRESET);
882 * p9_fd_close - shutdown file descriptor transport
883 * @client: client instance
887 static void p9_fd_close(struct p9_client *client)
889 struct p9_trans_fd *ts;
898 client->status = Disconnected;
900 p9_conn_destroy(&ts->conn);
911 * stolen from NFS - maybe should be made a generic function?
913 static inline int valid_ipaddr4(const char *buf)
915 int rc, count, in[4];
917 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
920 for (count = 0; count < 4; count++) {
927 static int p9_bind_privport(struct socket *sock)
929 struct sockaddr_in cl;
930 int port, err = -EINVAL;
932 memset(&cl, 0, sizeof(cl));
933 cl.sin_family = AF_INET;
934 cl.sin_addr.s_addr = INADDR_ANY;
935 for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) {
936 cl.sin_port = htons((ushort)port);
937 err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl));
938 if (err != -EADDRINUSE)
946 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
949 struct socket *csocket;
950 struct sockaddr_in sin_server;
951 struct p9_fd_opts opts;
953 err = parse_opts(args, &opts);
957 if (addr == NULL || valid_ipaddr4(addr) < 0)
962 client->trans_opts.tcp.port = opts.port;
963 client->trans_opts.tcp.privport = opts.privport;
964 sin_server.sin_family = AF_INET;
965 sin_server.sin_addr.s_addr = in_aton(addr);
966 sin_server.sin_port = htons(opts.port);
967 err = __sock_create(current->nsproxy->net_ns, PF_INET,
968 SOCK_STREAM, IPPROTO_TCP, &csocket, 1);
970 pr_err("%s (%d): problem creating socket\n",
971 __func__, task_pid_nr(current));
976 err = p9_bind_privport(csocket);
978 pr_err("%s (%d): problem binding to privport\n",
979 __func__, task_pid_nr(current));
980 sock_release(csocket);
985 err = csocket->ops->connect(csocket,
986 (struct sockaddr *)&sin_server,
987 sizeof(struct sockaddr_in), 0);
989 pr_err("%s (%d): problem connecting socket to %s\n",
990 __func__, task_pid_nr(current), addr);
991 sock_release(csocket);
995 return p9_socket_open(client, csocket);
999 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
1002 struct socket *csocket;
1003 struct sockaddr_un sun_server;
1010 if (strlen(addr) >= UNIX_PATH_MAX) {
1011 pr_err("%s (%d): address too long: %s\n",
1012 __func__, task_pid_nr(current), addr);
1013 return -ENAMETOOLONG;
1016 sun_server.sun_family = PF_UNIX;
1017 strcpy(sun_server.sun_path, addr);
1018 err = __sock_create(current->nsproxy->net_ns, PF_UNIX,
1019 SOCK_STREAM, 0, &csocket, 1);
1021 pr_err("%s (%d): problem creating socket\n",
1022 __func__, task_pid_nr(current));
1026 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1027 sizeof(struct sockaddr_un) - 1, 0);
1029 pr_err("%s (%d): problem connecting socket: %s: %d\n",
1030 __func__, task_pid_nr(current), addr, err);
1031 sock_release(csocket);
1035 return p9_socket_open(client, csocket);
1039 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1042 struct p9_fd_opts opts;
1044 parse_opts(args, &opts);
1045 client->trans_opts.fd.rfd = opts.rfd;
1046 client->trans_opts.fd.wfd = opts.wfd;
1048 if (opts.rfd == ~0 || opts.wfd == ~0) {
1049 pr_err("Insufficient options for proto=fd\n");
1050 return -ENOPROTOOPT;
1053 err = p9_fd_open(client, opts.rfd, opts.wfd);
1057 p9_conn_create(client);
1062 static struct p9_trans_module p9_tcp_trans = {
1064 .maxsize = MAX_SOCK_BUF,
1066 .create = p9_fd_create_tcp,
1067 .close = p9_fd_close,
1068 .request = p9_fd_request,
1069 .cancel = p9_fd_cancel,
1070 .cancelled = p9_fd_cancelled,
1071 .show_options = p9_fd_show_options,
1072 .owner = THIS_MODULE,
1075 static struct p9_trans_module p9_unix_trans = {
1077 .maxsize = MAX_SOCK_BUF,
1079 .create = p9_fd_create_unix,
1080 .close = p9_fd_close,
1081 .request = p9_fd_request,
1082 .cancel = p9_fd_cancel,
1083 .cancelled = p9_fd_cancelled,
1084 .show_options = p9_fd_show_options,
1085 .owner = THIS_MODULE,
1088 static struct p9_trans_module p9_fd_trans = {
1090 .maxsize = MAX_SOCK_BUF,
1092 .create = p9_fd_create,
1093 .close = p9_fd_close,
1094 .request = p9_fd_request,
1095 .cancel = p9_fd_cancel,
1096 .cancelled = p9_fd_cancelled,
1097 .show_options = p9_fd_show_options,
1098 .owner = THIS_MODULE,
1102 * p9_poll_workfn - poll worker thread
1105 * polls all v9fs transports for new events and queues the appropriate
1106 * work to the work queue
1110 static void p9_poll_workfn(struct work_struct *work)
1112 unsigned long flags;
1114 p9_debug(P9_DEBUG_TRANS, "start %p\n", current);
1116 spin_lock_irqsave(&p9_poll_lock, flags);
1117 while (!list_empty(&p9_poll_pending_list)) {
1118 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1121 list_del_init(&conn->poll_pending_link);
1122 spin_unlock_irqrestore(&p9_poll_lock, flags);
1126 spin_lock_irqsave(&p9_poll_lock, flags);
1128 spin_unlock_irqrestore(&p9_poll_lock, flags);
1130 p9_debug(P9_DEBUG_TRANS, "finish\n");
1133 int p9_trans_fd_init(void)
1135 v9fs_register_trans(&p9_tcp_trans);
1136 v9fs_register_trans(&p9_unix_trans);
1137 v9fs_register_trans(&p9_fd_trans);
1142 void p9_trans_fd_exit(void)
1144 flush_work(&p9_poll_work);
1145 v9fs_unregister_trans(&p9_tcp_trans);
1146 v9fs_unregister_trans(&p9_unix_trans);
1147 v9fs_unregister_trans(&p9_fd_trans);