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 <net/9p/9p.h>
45 #include <net/9p/client.h>
46 #include <net/9p/transport.h>
48 #include <linux/syscalls.h> /* killme */
51 #define MAX_SOCK_BUF (64*1024)
52 #define MAXPOLLWADDR 2
55 * struct p9_fd_opts - per-transport options
56 * @rfd: file descriptor for reading (trans=fd)
57 * @wfd: file descriptor for writing (trans=fd)
58 * @port: port to connect to (trans=tcp)
70 * Option Parsing (code inspired by NFS code)
71 * - a little lazy - parse all fd-transport options
75 /* Options that take integer arguments */
76 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
77 /* Options that take no arguments */
81 static const match_table_t tokens = {
82 {Opt_port, "port=%u"},
83 {Opt_rfdno, "rfdno=%u"},
84 {Opt_wfdno, "wfdno=%u"},
85 {Opt_privport, "privport"},
90 Rworksched = 1, /* read work scheduled or running */
91 Rpending = 2, /* can read */
92 Wworksched = 4, /* write work scheduled or running */
93 Wpending = 8, /* can write */
99 wait_queue_head_t *wait_addr;
103 * struct p9_conn - fd mux connection state information
104 * @mux_list: list link for mux to manage multiple connections (?)
105 * @client: reference to client instance for this connection
107 * @req_list: accounting for requests which have been sent
108 * @unsent_req_list: accounting for requests that haven't been sent
109 * @req: current request being processed (if any)
110 * @tmp_buf: temporary buffer to read in header
111 * @rc: temporary fcall for reading current frame
112 * @wpos: write position for current frame
113 * @wsize: amount of data to write for current frame
114 * @wbuf: current write buffer
115 * @poll_pending_link: pending links to be polled per conn
116 * @poll_wait: array of wait_q's for various worker threads
118 * @rq: current read work
119 * @wq: current write work
125 struct list_head mux_list;
126 struct p9_client *client;
128 struct list_head req_list;
129 struct list_head unsent_req_list;
130 struct p9_req_t *req;
136 struct list_head poll_pending_link;
137 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
139 struct work_struct rq;
140 struct work_struct wq;
141 unsigned long wsched;
145 * struct p9_trans_fd - transport state
146 * @rd: reference to file to read from
147 * @wr: reference of file to write to
148 * @conn: connection state reference
158 static void p9_poll_workfn(struct work_struct *work);
160 static DEFINE_SPINLOCK(p9_poll_lock);
161 static LIST_HEAD(p9_poll_pending_list);
162 static DECLARE_WORK(p9_poll_work, p9_poll_workfn);
164 static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT;
165 static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT;
167 static void p9_mux_poll_stop(struct p9_conn *m)
172 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
173 struct p9_poll_wait *pwait = &m->poll_wait[i];
175 if (pwait->wait_addr) {
176 remove_wait_queue(pwait->wait_addr, &pwait->wait);
177 pwait->wait_addr = NULL;
181 spin_lock_irqsave(&p9_poll_lock, flags);
182 list_del_init(&m->poll_pending_link);
183 spin_unlock_irqrestore(&p9_poll_lock, flags);
185 flush_work(&p9_poll_work);
189 * p9_conn_cancel - cancel all pending requests with error
195 static void p9_conn_cancel(struct p9_conn *m, int err)
197 struct p9_req_t *req, *rtmp;
198 LIST_HEAD(cancel_list);
200 p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
202 spin_lock(&m->client->lock);
205 spin_unlock(&m->client->lock);
211 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
212 list_move(&req->req_list, &cancel_list);
214 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
215 list_move(&req->req_list, &cancel_list);
218 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
219 p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req);
220 list_del(&req->req_list);
223 p9_client_cb(m->client, req, REQ_STATUS_ERROR);
225 spin_unlock(&m->client->lock);
229 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
232 struct p9_trans_fd *ts = NULL;
234 if (client && client->status == Connected)
240 if (!ts->rd->f_op->poll)
243 if (!ts->wr->f_op->poll)
246 ret = ts->rd->f_op->poll(ts->rd, pt);
250 if (ts->rd != ts->wr) {
251 n = ts->wr->f_op->poll(ts->wr, pt);
254 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
261 * p9_fd_read- read from a fd
262 * @client: client instance
263 * @v: buffer to receive data into
264 * @len: size of receive buffer
268 static int p9_fd_read(struct p9_client *client, void *v, int len)
271 struct p9_trans_fd *ts = NULL;
273 if (client && client->status != Disconnected)
279 if (!(ts->rd->f_flags & O_NONBLOCK))
280 p9_debug(P9_DEBUG_ERROR, "blocking read ...\n");
282 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
283 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
284 client->status = Disconnected;
289 * p9_read_work - called when there is some data to be read from a transport
290 * @work: container of work to be done
294 static void p9_read_work(struct work_struct *work)
299 m = container_of(work, struct p9_conn, rq);
304 p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset);
307 m->rc.sdata = m->tmp_buf;
309 m->rc.capacity = 7; /* start by reading header */
312 clear_bit(Rpending, &m->wsched);
313 p9_debug(P9_DEBUG_TRANS, "read mux %p pos %zd size: %zd = %zd\n",
314 m, m->rc.offset, m->rc.capacity,
315 m->rc.capacity - m->rc.offset);
316 err = p9_fd_read(m->client, m->rc.sdata + m->rc.offset,
317 m->rc.capacity - m->rc.offset);
318 p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err);
328 if ((!m->req) && (m->rc.offset == m->rc.capacity)) {
329 p9_debug(P9_DEBUG_TRANS, "got new header\n");
331 err = p9_parse_header(&m->rc, NULL, 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 == NULL) {
359 p9_debug(P9_DEBUG_ERROR,
360 "No recv fcall for tag %d (req %p), disconnecting!\n",
366 m->rc.sdata = (char *)m->req->rc + sizeof(struct p9_fcall);
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 spin_lock(&m->client->lock);
377 if (m->req->status == REQ_STATUS_SENT) {
378 list_del(&m->req->req_list);
379 p9_client_cb(m->client, m->req, REQ_STATUS_RCVD);
380 } else if (m->req->status == REQ_STATUS_FLSHD) {
381 /* Ignore replies associated with a cancelled request. */
382 p9_debug(P9_DEBUG_TRANS,
383 "Ignore replies associated with a cancelled request\n");
385 spin_unlock(&m->client->lock);
386 p9_debug(P9_DEBUG_ERROR,
387 "Request tag %d errored out while we were reading the reply\n",
392 spin_unlock(&m->client->lock);
400 clear_bit(Rworksched, &m->wsched);
402 if (!list_empty(&m->req_list)) {
403 if (test_and_clear_bit(Rpending, &m->wsched))
406 n = p9_fd_poll(m->client, NULL);
408 if ((n & POLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) {
409 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
410 schedule_work(&m->rq);
416 p9_conn_cancel(m, err);
417 clear_bit(Rworksched, &m->wsched);
421 * p9_fd_write - write to a socket
422 * @client: client instance
423 * @v: buffer to send data from
424 * @len: size of send buffer
428 static int p9_fd_write(struct p9_client *client, void *v, int len)
432 struct p9_trans_fd *ts = NULL;
434 if (client && client->status != Disconnected)
440 if (!(ts->wr->f_flags & O_NONBLOCK))
441 p9_debug(P9_DEBUG_ERROR, "blocking write ...\n");
445 /* The cast to a user pointer is valid due to the set_fs() */
446 ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos);
449 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
450 client->status = Disconnected;
455 * p9_write_work - called when a transport can send some data
456 * @work: container for work to be done
460 static void p9_write_work(struct work_struct *work)
464 struct p9_req_t *req;
466 m = container_of(work, struct p9_conn, wq);
469 clear_bit(Wworksched, &m->wsched);
474 spin_lock(&m->client->lock);
475 if (list_empty(&m->unsent_req_list)) {
476 clear_bit(Wworksched, &m->wsched);
477 spin_unlock(&m->client->lock);
481 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
483 req->status = REQ_STATUS_SENT;
484 p9_debug(P9_DEBUG_TRANS, "move req %p\n", req);
485 list_move_tail(&req->req_list, &m->req_list);
487 m->wbuf = req->tc->sdata;
488 m->wsize = req->tc->size;
490 spin_unlock(&m->client->lock);
493 p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n",
494 m, m->wpos, m->wsize);
495 clear_bit(Wpending, &m->wsched);
496 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
497 p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);
510 if (m->wpos == m->wsize)
511 m->wpos = m->wsize = 0;
514 clear_bit(Wworksched, &m->wsched);
516 if (m->wsize || !list_empty(&m->unsent_req_list)) {
517 if (test_and_clear_bit(Wpending, &m->wsched))
520 n = p9_fd_poll(m->client, NULL);
523 !test_and_set_bit(Wworksched, &m->wsched)) {
524 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
525 schedule_work(&m->wq);
532 p9_conn_cancel(m, err);
533 clear_bit(Wworksched, &m->wsched);
536 static int p9_pollwake(wait_queue_t *wait, unsigned int mode, int sync, void *key)
538 struct p9_poll_wait *pwait =
539 container_of(wait, struct p9_poll_wait, wait);
540 struct p9_conn *m = pwait->conn;
543 spin_lock_irqsave(&p9_poll_lock, flags);
544 if (list_empty(&m->poll_pending_link))
545 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
546 spin_unlock_irqrestore(&p9_poll_lock, flags);
548 schedule_work(&p9_poll_work);
553 * p9_pollwait - add poll task to the wait queue
554 * @filp: file pointer being polled
555 * @wait_address: wait_q to block on
558 * called by files poll operation to add v9fs-poll task to files wait queue
562 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
564 struct p9_conn *m = container_of(p, struct p9_conn, pt);
565 struct p9_poll_wait *pwait = NULL;
568 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
569 if (m->poll_wait[i].wait_addr == NULL) {
570 pwait = &m->poll_wait[i];
576 p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n");
581 pwait->wait_addr = wait_address;
582 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
583 add_wait_queue(wait_address, &pwait->wait);
587 * p9_conn_create - initialize the per-session mux data
588 * @client: client instance
590 * Note: Creates the polling task if this is the first session.
593 static void p9_conn_create(struct p9_client *client)
596 struct p9_trans_fd *ts = client->trans;
597 struct p9_conn *m = &ts->conn;
599 p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize);
601 INIT_LIST_HEAD(&m->mux_list);
604 INIT_LIST_HEAD(&m->req_list);
605 INIT_LIST_HEAD(&m->unsent_req_list);
606 INIT_WORK(&m->rq, p9_read_work);
607 INIT_WORK(&m->wq, p9_write_work);
608 INIT_LIST_HEAD(&m->poll_pending_link);
609 init_poll_funcptr(&m->pt, p9_pollwait);
611 n = p9_fd_poll(client, &m->pt);
613 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
614 set_bit(Rpending, &m->wsched);
618 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
619 set_bit(Wpending, &m->wsched);
624 * p9_poll_mux - polls a mux and schedules read or write works if necessary
625 * @m: connection to poll
629 static void p9_poll_mux(struct p9_conn *m)
636 n = p9_fd_poll(m->client, NULL);
637 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
638 p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);
641 p9_conn_cancel(m, n);
645 set_bit(Rpending, &m->wsched);
646 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
647 if (!test_and_set_bit(Rworksched, &m->wsched)) {
648 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
649 schedule_work(&m->rq);
654 set_bit(Wpending, &m->wsched);
655 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
656 if ((m->wsize || !list_empty(&m->unsent_req_list)) &&
657 !test_and_set_bit(Wworksched, &m->wsched)) {
658 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
659 schedule_work(&m->wq);
665 * p9_fd_request - send 9P request
666 * The function can sleep until the request is scheduled for sending.
667 * The function can be interrupted. Return from the function is not
668 * a guarantee that the request is sent successfully.
670 * @client: client instance
671 * @req: request to be sent
675 static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
678 struct p9_trans_fd *ts = client->trans;
679 struct p9_conn *m = &ts->conn;
681 p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n",
682 m, current, req->tc, req->tc->id);
686 spin_lock(&client->lock);
687 req->status = REQ_STATUS_UNSENT;
688 list_add_tail(&req->req_list, &m->unsent_req_list);
689 spin_unlock(&client->lock);
691 if (test_and_clear_bit(Wpending, &m->wsched))
694 n = p9_fd_poll(m->client, NULL);
696 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
697 schedule_work(&m->wq);
702 static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
706 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
708 spin_lock(&client->lock);
710 if (req->status == REQ_STATUS_UNSENT) {
711 list_del(&req->req_list);
712 req->status = REQ_STATUS_FLSHD;
715 spin_unlock(&client->lock);
720 static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req)
722 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
724 spin_lock(&client->lock);
725 /* Ignore cancelled request if message has been received
728 if (req->status == REQ_STATUS_RCVD) {
729 spin_unlock(&client->lock);
733 /* we haven't received a response for oldreq,
734 * remove it from the list.
736 list_del(&req->req_list);
737 req->status = REQ_STATUS_FLSHD;
738 spin_unlock(&client->lock);
744 * parse_opts - parse mount options into p9_fd_opts structure
745 * @params: options string passed from mount
746 * @opts: fd transport-specific structure to parse options into
748 * Returns 0 upon success, -ERRNO upon failure
751 static int parse_opts(char *params, struct p9_fd_opts *opts)
754 substring_t args[MAX_OPT_ARGS];
756 char *options, *tmp_options;
758 opts->port = P9_PORT;
766 tmp_options = kstrdup(params, GFP_KERNEL);
768 p9_debug(P9_DEBUG_ERROR,
769 "failed to allocate copy of option string\n");
772 options = tmp_options;
774 while ((p = strsep(&options, ",")) != NULL) {
779 token = match_token(p, tokens, args);
780 if ((token != Opt_err) && (token != Opt_privport)) {
781 r = match_int(&args[0], &option);
783 p9_debug(P9_DEBUG_ERROR,
784 "integer field, but no integer?\n");
810 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
812 struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd),
820 if (!(ts->rd->f_mode & FMODE_READ))
825 if (!(ts->wr->f_mode & FMODE_WRITE))
829 client->status = Connected;
842 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
844 struct p9_trans_fd *p;
847 p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL);
851 csocket->sk->sk_allocation = GFP_NOIO;
852 file = sock_alloc_file(csocket, 0, NULL);
854 pr_err("%s (%d): failed to map fd\n",
855 __func__, task_pid_nr(current));
856 sock_release(csocket);
858 return PTR_ERR(file);
862 p->wr = p->rd = file;
864 client->status = Connected;
866 p->rd->f_flags |= O_NONBLOCK;
868 p9_conn_create(client);
873 * p9_mux_destroy - cancels all pending requests of mux
878 static void p9_conn_destroy(struct p9_conn *m)
880 p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n",
881 m, m->mux_list.prev, m->mux_list.next);
884 cancel_work_sync(&m->rq);
885 cancel_work_sync(&m->wq);
887 p9_conn_cancel(m, -ECONNRESET);
893 * p9_fd_close - shutdown file descriptor transport
894 * @client: client instance
898 static void p9_fd_close(struct p9_client *client)
900 struct p9_trans_fd *ts;
909 client->status = Disconnected;
911 p9_conn_destroy(&ts->conn);
922 * stolen from NFS - maybe should be made a generic function?
924 static inline int valid_ipaddr4(const char *buf)
926 int rc, count, in[4];
928 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
931 for (count = 0; count < 4; count++) {
938 static int p9_bind_privport(struct socket *sock)
940 struct sockaddr_in cl;
941 int port, err = -EINVAL;
943 memset(&cl, 0, sizeof(cl));
944 cl.sin_family = AF_INET;
945 cl.sin_addr.s_addr = INADDR_ANY;
946 for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) {
947 cl.sin_port = htons((ushort)port);
948 err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl));
949 if (err != -EADDRINUSE)
957 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
960 struct socket *csocket;
961 struct sockaddr_in sin_server;
962 struct p9_fd_opts opts;
964 err = parse_opts(args, &opts);
968 if (addr == NULL || valid_ipaddr4(addr) < 0)
973 sin_server.sin_family = AF_INET;
974 sin_server.sin_addr.s_addr = in_aton(addr);
975 sin_server.sin_port = htons(opts.port);
976 err = __sock_create(current->nsproxy->net_ns, PF_INET,
977 SOCK_STREAM, IPPROTO_TCP, &csocket, 1);
979 pr_err("%s (%d): problem creating socket\n",
980 __func__, task_pid_nr(current));
985 err = p9_bind_privport(csocket);
987 pr_err("%s (%d): problem binding to privport\n",
988 __func__, task_pid_nr(current));
989 sock_release(csocket);
994 err = csocket->ops->connect(csocket,
995 (struct sockaddr *)&sin_server,
996 sizeof(struct sockaddr_in), 0);
998 pr_err("%s (%d): problem connecting socket to %s\n",
999 __func__, task_pid_nr(current), addr);
1000 sock_release(csocket);
1004 return p9_socket_open(client, csocket);
1008 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
1011 struct socket *csocket;
1012 struct sockaddr_un sun_server;
1016 if (!addr || !strlen(addr))
1019 if (strlen(addr) >= UNIX_PATH_MAX) {
1020 pr_err("%s (%d): address too long: %s\n",
1021 __func__, task_pid_nr(current), addr);
1022 return -ENAMETOOLONG;
1025 sun_server.sun_family = PF_UNIX;
1026 strcpy(sun_server.sun_path, addr);
1027 err = __sock_create(current->nsproxy->net_ns, PF_UNIX,
1028 SOCK_STREAM, 0, &csocket, 1);
1030 pr_err("%s (%d): problem creating socket\n",
1031 __func__, task_pid_nr(current));
1035 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1036 sizeof(struct sockaddr_un) - 1, 0);
1038 pr_err("%s (%d): problem connecting socket: %s: %d\n",
1039 __func__, task_pid_nr(current), addr, err);
1040 sock_release(csocket);
1044 return p9_socket_open(client, csocket);
1048 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1051 struct p9_fd_opts opts;
1053 parse_opts(args, &opts);
1055 if (opts.rfd == ~0 || opts.wfd == ~0) {
1056 pr_err("Insufficient options for proto=fd\n");
1057 return -ENOPROTOOPT;
1060 err = p9_fd_open(client, opts.rfd, opts.wfd);
1064 p9_conn_create(client);
1069 static struct p9_trans_module p9_tcp_trans = {
1071 .maxsize = MAX_SOCK_BUF,
1073 .create = p9_fd_create_tcp,
1074 .close = p9_fd_close,
1075 .request = p9_fd_request,
1076 .cancel = p9_fd_cancel,
1077 .cancelled = p9_fd_cancelled,
1078 .owner = THIS_MODULE,
1081 static struct p9_trans_module p9_unix_trans = {
1083 .maxsize = MAX_SOCK_BUF,
1085 .create = p9_fd_create_unix,
1086 .close = p9_fd_close,
1087 .request = p9_fd_request,
1088 .cancel = p9_fd_cancel,
1089 .cancelled = p9_fd_cancelled,
1090 .owner = THIS_MODULE,
1093 static struct p9_trans_module p9_fd_trans = {
1095 .maxsize = MAX_SOCK_BUF,
1097 .create = p9_fd_create,
1098 .close = p9_fd_close,
1099 .request = p9_fd_request,
1100 .cancel = p9_fd_cancel,
1101 .cancelled = p9_fd_cancelled,
1102 .owner = THIS_MODULE,
1106 * p9_poll_proc - poll worker thread
1107 * @a: thread state and arguments
1109 * polls all v9fs transports for new events and queues the appropriate
1110 * work to the work queue
1114 static void p9_poll_workfn(struct work_struct *work)
1116 unsigned long flags;
1118 p9_debug(P9_DEBUG_TRANS, "start %p\n", current);
1120 spin_lock_irqsave(&p9_poll_lock, flags);
1121 while (!list_empty(&p9_poll_pending_list)) {
1122 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1125 list_del_init(&conn->poll_pending_link);
1126 spin_unlock_irqrestore(&p9_poll_lock, flags);
1130 spin_lock_irqsave(&p9_poll_lock, flags);
1132 spin_unlock_irqrestore(&p9_poll_lock, flags);
1134 p9_debug(P9_DEBUG_TRANS, "finish\n");
1137 int p9_trans_fd_init(void)
1139 v9fs_register_trans(&p9_tcp_trans);
1140 v9fs_register_trans(&p9_unix_trans);
1141 v9fs_register_trans(&p9_fd_trans);
1146 void p9_trans_fd_exit(void)
1148 flush_work(&p9_poll_work);
1149 v9fs_unregister_trans(&p9_tcp_trans);
1150 v9fs_unregister_trans(&p9_unix_trans);
1151 v9fs_unregister_trans(&p9_fd_trans);