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;
140 struct list_head poll_pending_link;
141 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
143 struct work_struct rq;
144 struct work_struct wq;
145 unsigned long wsched;
149 * struct p9_trans_fd - transport state
150 * @rd: reference to file to read from
151 * @wr: reference of file to write to
152 * @conn: connection state reference
162 static void p9_poll_workfn(struct work_struct *work);
164 static DEFINE_SPINLOCK(p9_poll_lock);
165 static LIST_HEAD(p9_poll_pending_list);
166 static DECLARE_WORK(p9_poll_work, p9_poll_workfn);
168 static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT;
169 static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT;
171 static void p9_mux_poll_stop(struct p9_conn *m)
176 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
177 struct p9_poll_wait *pwait = &m->poll_wait[i];
179 if (pwait->wait_addr) {
180 remove_wait_queue(pwait->wait_addr, &pwait->wait);
181 pwait->wait_addr = NULL;
185 spin_lock_irqsave(&p9_poll_lock, flags);
186 list_del_init(&m->poll_pending_link);
187 spin_unlock_irqrestore(&p9_poll_lock, flags);
191 * p9_conn_cancel - cancel all pending requests with error
197 static void p9_conn_cancel(struct p9_conn *m, int err)
199 struct p9_req_t *req, *rtmp;
201 LIST_HEAD(cancel_list);
203 p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
205 spin_lock_irqsave(&m->client->lock, flags);
208 spin_unlock_irqrestore(&m->client->lock, flags);
214 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
215 list_move(&req->req_list, &cancel_list);
217 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
218 list_move(&req->req_list, &cancel_list);
220 spin_unlock_irqrestore(&m->client->lock, flags);
222 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
223 p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req);
224 list_del(&req->req_list);
227 p9_client_cb(m->client, req, REQ_STATUS_ERROR);
232 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
235 struct p9_trans_fd *ts = NULL;
237 if (client && client->status == Connected)
243 if (!ts->rd->f_op->poll)
246 if (!ts->wr->f_op->poll)
249 ret = ts->rd->f_op->poll(ts->rd, pt);
253 if (ts->rd != ts->wr) {
254 n = ts->wr->f_op->poll(ts->wr, pt);
257 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
264 * p9_fd_read- read from a fd
265 * @client: client instance
266 * @v: buffer to receive data into
267 * @len: size of receive buffer
271 static int p9_fd_read(struct p9_client *client, void *v, int len)
274 struct p9_trans_fd *ts = NULL;
276 if (client && client->status != Disconnected)
282 if (!(ts->rd->f_flags & O_NONBLOCK))
283 p9_debug(P9_DEBUG_ERROR, "blocking read ...\n");
285 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
286 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
287 client->status = Disconnected;
292 * p9_read_work - called when there is some data to be read from a transport
293 * @work: container of work to be done
297 static void p9_read_work(struct work_struct *work)
301 int status = REQ_STATUS_ERROR;
303 m = container_of(work, struct p9_conn, rq);
308 p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset);
311 m->rc.sdata = m->tmp_buf;
313 m->rc.capacity = 7; /* start by reading header */
316 clear_bit(Rpending, &m->wsched);
317 p9_debug(P9_DEBUG_TRANS, "read mux %p pos %zd size: %zd = %zd\n",
318 m, m->rc.offset, m->rc.capacity,
319 m->rc.capacity - m->rc.offset);
320 err = p9_fd_read(m->client, m->rc.sdata + m->rc.offset,
321 m->rc.capacity - m->rc.offset);
322 p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err);
332 if ((!m->req) && (m->rc.offset == m->rc.capacity)) {
333 p9_debug(P9_DEBUG_TRANS, "got new header\n");
335 err = p9_parse_header(&m->rc, NULL, NULL, NULL, 0);
337 p9_debug(P9_DEBUG_ERROR,
338 "error parsing header: %d\n", err);
342 if (m->rc.size >= m->client->msize) {
343 p9_debug(P9_DEBUG_ERROR,
344 "requested packet size too big: %d\n",
350 p9_debug(P9_DEBUG_TRANS,
351 "mux %p pkt: size: %d bytes tag: %d\n",
352 m, m->rc.size, m->rc.tag);
354 m->req = p9_tag_lookup(m->client, m->rc.tag);
355 if (!m->req || (m->req->status != REQ_STATUS_SENT)) {
356 p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
362 if (m->req->rc == NULL) {
363 p9_debug(P9_DEBUG_ERROR,
364 "No recv fcall for tag %d (req %p), disconnecting!\n",
370 m->rc.sdata = (char *)m->req->rc + sizeof(struct p9_fcall);
371 memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity);
372 m->rc.capacity = m->rc.size;
376 * not an else because some packets (like clunk) have no payload
378 if ((m->req) && (m->rc.offset == m->rc.capacity)) {
379 p9_debug(P9_DEBUG_TRANS, "got new packet\n");
380 spin_lock(&m->client->lock);
381 if (m->req->status != REQ_STATUS_ERROR)
382 status = REQ_STATUS_RCVD;
383 list_del(&m->req->req_list);
384 spin_unlock(&m->client->lock);
385 p9_client_cb(m->client, m->req, status);
393 clear_bit(Rworksched, &m->wsched);
395 if (!list_empty(&m->req_list)) {
396 if (test_and_clear_bit(Rpending, &m->wsched))
399 n = p9_fd_poll(m->client, NULL);
401 if ((n & POLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) {
402 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
403 schedule_work(&m->rq);
409 p9_conn_cancel(m, err);
410 clear_bit(Rworksched, &m->wsched);
414 * p9_fd_write - write to a socket
415 * @client: client instance
416 * @v: buffer to send data from
417 * @len: size of send buffer
421 static int p9_fd_write(struct p9_client *client, void *v, int len)
425 struct p9_trans_fd *ts = NULL;
427 if (client && client->status != Disconnected)
433 if (!(ts->wr->f_flags & O_NONBLOCK))
434 p9_debug(P9_DEBUG_ERROR, "blocking write ...\n");
438 /* The cast to a user pointer is valid due to the set_fs() */
439 ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos);
442 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
443 client->status = Disconnected;
448 * p9_write_work - called when a transport can send some data
449 * @work: container for work to be done
453 static void p9_write_work(struct work_struct *work)
457 struct p9_req_t *req;
459 m = container_of(work, struct p9_conn, wq);
462 clear_bit(Wworksched, &m->wsched);
467 spin_lock(&m->client->lock);
468 if (list_empty(&m->unsent_req_list)) {
469 clear_bit(Wworksched, &m->wsched);
470 spin_unlock(&m->client->lock);
474 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
476 req->status = REQ_STATUS_SENT;
477 p9_debug(P9_DEBUG_TRANS, "move req %p\n", req);
478 list_move_tail(&req->req_list, &m->req_list);
480 m->wbuf = req->tc->sdata;
481 m->wsize = req->tc->size;
483 spin_unlock(&m->client->lock);
486 p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n",
487 m, m->wpos, m->wsize);
488 clear_bit(Wpending, &m->wsched);
489 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
490 p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);
503 if (m->wpos == m->wsize)
504 m->wpos = m->wsize = 0;
507 clear_bit(Wworksched, &m->wsched);
509 if (m->wsize || !list_empty(&m->unsent_req_list)) {
510 if (test_and_clear_bit(Wpending, &m->wsched))
513 n = p9_fd_poll(m->client, NULL);
516 !test_and_set_bit(Wworksched, &m->wsched)) {
517 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
518 schedule_work(&m->wq);
525 p9_conn_cancel(m, err);
526 clear_bit(Wworksched, &m->wsched);
529 static int p9_pollwake(wait_queue_entry_t *wait, unsigned int mode, int sync, void *key)
531 struct p9_poll_wait *pwait =
532 container_of(wait, struct p9_poll_wait, wait);
533 struct p9_conn *m = pwait->conn;
536 spin_lock_irqsave(&p9_poll_lock, flags);
537 if (list_empty(&m->poll_pending_link))
538 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
539 spin_unlock_irqrestore(&p9_poll_lock, flags);
541 schedule_work(&p9_poll_work);
546 * p9_pollwait - add poll task to the wait queue
547 * @filp: file pointer being polled
548 * @wait_address: wait_q to block on
551 * called by files poll operation to add v9fs-poll task to files wait queue
555 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
557 struct p9_conn *m = container_of(p, struct p9_conn, pt);
558 struct p9_poll_wait *pwait = NULL;
561 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
562 if (m->poll_wait[i].wait_addr == NULL) {
563 pwait = &m->poll_wait[i];
569 p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n");
574 pwait->wait_addr = wait_address;
575 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
576 add_wait_queue(wait_address, &pwait->wait);
580 * p9_conn_create - initialize the per-session mux data
581 * @client: client instance
583 * Note: Creates the polling task if this is the first session.
586 static void p9_conn_create(struct p9_client *client)
589 struct p9_trans_fd *ts = client->trans;
590 struct p9_conn *m = &ts->conn;
592 p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize);
594 INIT_LIST_HEAD(&m->mux_list);
597 INIT_LIST_HEAD(&m->req_list);
598 INIT_LIST_HEAD(&m->unsent_req_list);
599 INIT_WORK(&m->rq, p9_read_work);
600 INIT_WORK(&m->wq, p9_write_work);
601 INIT_LIST_HEAD(&m->poll_pending_link);
602 init_poll_funcptr(&m->pt, p9_pollwait);
604 n = p9_fd_poll(client, &m->pt);
606 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
607 set_bit(Rpending, &m->wsched);
611 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
612 set_bit(Wpending, &m->wsched);
617 * p9_poll_mux - polls a mux and schedules read or write works if necessary
618 * @m: connection to poll
622 static void p9_poll_mux(struct p9_conn *m)
629 n = p9_fd_poll(m->client, NULL);
630 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
631 p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);
634 p9_conn_cancel(m, n);
638 set_bit(Rpending, &m->wsched);
639 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
640 if (!test_and_set_bit(Rworksched, &m->wsched)) {
641 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
642 schedule_work(&m->rq);
647 set_bit(Wpending, &m->wsched);
648 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
649 if ((m->wsize || !list_empty(&m->unsent_req_list)) &&
650 !test_and_set_bit(Wworksched, &m->wsched)) {
651 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
652 schedule_work(&m->wq);
658 * p9_fd_request - send 9P request
659 * The function can sleep until the request is scheduled for sending.
660 * The function can be interrupted. Return from the function is not
661 * a guarantee that the request is sent successfully.
663 * @client: client instance
664 * @req: request to be sent
668 static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
671 struct p9_trans_fd *ts = client->trans;
672 struct p9_conn *m = &ts->conn;
674 p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n",
675 m, current, req->tc, req->tc->id);
679 spin_lock(&client->lock);
680 req->status = REQ_STATUS_UNSENT;
681 list_add_tail(&req->req_list, &m->unsent_req_list);
682 spin_unlock(&client->lock);
684 if (test_and_clear_bit(Wpending, &m->wsched))
687 n = p9_fd_poll(m->client, NULL);
689 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
690 schedule_work(&m->wq);
695 static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
699 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
701 spin_lock(&client->lock);
703 if (req->status == REQ_STATUS_UNSENT) {
704 list_del(&req->req_list);
705 req->status = REQ_STATUS_FLSHD;
708 spin_unlock(&client->lock);
713 static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req)
715 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
717 /* we haven't received a response for oldreq,
718 * remove it from the list.
720 spin_lock(&client->lock);
721 list_del(&req->req_list);
722 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));
846 sock_release(csocket);
848 return PTR_ERR(file);
852 p->wr = p->rd = file;
854 client->status = Connected;
856 p->rd->f_flags |= O_NONBLOCK;
858 p9_conn_create(client);
863 * p9_mux_destroy - cancels all pending requests of mux
868 static void p9_conn_destroy(struct p9_conn *m)
870 p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n",
871 m, m->mux_list.prev, m->mux_list.next);
874 cancel_work_sync(&m->rq);
875 cancel_work_sync(&m->wq);
877 p9_conn_cancel(m, -ECONNRESET);
883 * p9_fd_close - shutdown file descriptor transport
884 * @client: client instance
888 static void p9_fd_close(struct p9_client *client)
890 struct p9_trans_fd *ts;
899 client->status = Disconnected;
901 p9_conn_destroy(&ts->conn);
912 * stolen from NFS - maybe should be made a generic function?
914 static inline int valid_ipaddr4(const char *buf)
916 int rc, count, in[4];
918 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
921 for (count = 0; count < 4; count++) {
928 static int p9_bind_privport(struct socket *sock)
930 struct sockaddr_in cl;
931 int port, err = -EINVAL;
933 memset(&cl, 0, sizeof(cl));
934 cl.sin_family = AF_INET;
935 cl.sin_addr.s_addr = INADDR_ANY;
936 for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) {
937 cl.sin_port = htons((ushort)port);
938 err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl));
939 if (err != -EADDRINUSE)
947 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
950 struct socket *csocket;
951 struct sockaddr_in sin_server;
952 struct p9_fd_opts opts;
954 err = parse_opts(args, &opts);
958 if (valid_ipaddr4(addr) < 0)
963 client->trans_opts.tcp.port = opts.port;
964 client->trans_opts.tcp.privport = opts.privport;
965 sin_server.sin_family = AF_INET;
966 sin_server.sin_addr.s_addr = in_aton(addr);
967 sin_server.sin_port = htons(opts.port);
968 err = __sock_create(current->nsproxy->net_ns, PF_INET,
969 SOCK_STREAM, IPPROTO_TCP, &csocket, 1);
971 pr_err("%s (%d): problem creating socket\n",
972 __func__, task_pid_nr(current));
977 err = p9_bind_privport(csocket);
979 pr_err("%s (%d): problem binding to privport\n",
980 __func__, task_pid_nr(current));
981 sock_release(csocket);
986 err = csocket->ops->connect(csocket,
987 (struct sockaddr *)&sin_server,
988 sizeof(struct sockaddr_in), 0);
990 pr_err("%s (%d): problem connecting socket to %s\n",
991 __func__, task_pid_nr(current), addr);
992 sock_release(csocket);
996 return p9_socket_open(client, csocket);
1000 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
1003 struct socket *csocket;
1004 struct sockaddr_un sun_server;
1008 if (strlen(addr) >= UNIX_PATH_MAX) {
1009 pr_err("%s (%d): address too long: %s\n",
1010 __func__, task_pid_nr(current), addr);
1011 return -ENAMETOOLONG;
1014 sun_server.sun_family = PF_UNIX;
1015 strcpy(sun_server.sun_path, addr);
1016 err = __sock_create(current->nsproxy->net_ns, PF_UNIX,
1017 SOCK_STREAM, 0, &csocket, 1);
1019 pr_err("%s (%d): problem creating socket\n",
1020 __func__, task_pid_nr(current));
1024 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1025 sizeof(struct sockaddr_un) - 1, 0);
1027 pr_err("%s (%d): problem connecting socket: %s: %d\n",
1028 __func__, task_pid_nr(current), addr, err);
1029 sock_release(csocket);
1033 return p9_socket_open(client, csocket);
1037 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1040 struct p9_fd_opts opts;
1042 parse_opts(args, &opts);
1043 client->trans_opts.fd.rfd = opts.rfd;
1044 client->trans_opts.fd.wfd = opts.wfd;
1046 if (opts.rfd == ~0 || opts.wfd == ~0) {
1047 pr_err("Insufficient options for proto=fd\n");
1048 return -ENOPROTOOPT;
1051 err = p9_fd_open(client, opts.rfd, opts.wfd);
1055 p9_conn_create(client);
1060 static struct p9_trans_module p9_tcp_trans = {
1062 .maxsize = MAX_SOCK_BUF,
1064 .create = p9_fd_create_tcp,
1065 .close = p9_fd_close,
1066 .request = p9_fd_request,
1067 .cancel = p9_fd_cancel,
1068 .cancelled = p9_fd_cancelled,
1069 .show_options = p9_fd_show_options,
1070 .owner = THIS_MODULE,
1073 static struct p9_trans_module p9_unix_trans = {
1075 .maxsize = MAX_SOCK_BUF,
1077 .create = p9_fd_create_unix,
1078 .close = p9_fd_close,
1079 .request = p9_fd_request,
1080 .cancel = p9_fd_cancel,
1081 .cancelled = p9_fd_cancelled,
1082 .show_options = p9_fd_show_options,
1083 .owner = THIS_MODULE,
1086 static struct p9_trans_module p9_fd_trans = {
1088 .maxsize = MAX_SOCK_BUF,
1090 .create = p9_fd_create,
1091 .close = p9_fd_close,
1092 .request = p9_fd_request,
1093 .cancel = p9_fd_cancel,
1094 .cancelled = p9_fd_cancelled,
1095 .show_options = p9_fd_show_options,
1096 .owner = THIS_MODULE,
1100 * p9_poll_proc - poll worker thread
1101 * @a: thread state and arguments
1103 * polls all v9fs transports for new events and queues the appropriate
1104 * work to the work queue
1108 static void p9_poll_workfn(struct work_struct *work)
1110 unsigned long flags;
1112 p9_debug(P9_DEBUG_TRANS, "start %p\n", current);
1114 spin_lock_irqsave(&p9_poll_lock, flags);
1115 while (!list_empty(&p9_poll_pending_list)) {
1116 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1119 list_del_init(&conn->poll_pending_link);
1120 spin_unlock_irqrestore(&p9_poll_lock, flags);
1124 spin_lock_irqsave(&p9_poll_lock, flags);
1126 spin_unlock_irqrestore(&p9_poll_lock, flags);
1128 p9_debug(P9_DEBUG_TRANS, "finish\n");
1131 int p9_trans_fd_init(void)
1133 v9fs_register_trans(&p9_tcp_trans);
1134 v9fs_register_trans(&p9_unix_trans);
1135 v9fs_register_trans(&p9_fd_trans);
1140 void p9_trans_fd_exit(void)
1142 flush_work(&p9_poll_work);
1143 v9fs_unregister_trans(&p9_tcp_trans);
1144 v9fs_unregister_trans(&p9_unix_trans);
1145 v9fs_unregister_trans(&p9_fd_trans);