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
29 #include <linux/module.h>
30 #include <linux/net.h>
31 #include <linux/ipv6.h>
32 #include <linux/kthread.h>
33 #include <linux/errno.h>
34 #include <linux/kernel.h>
36 #include <linux/uaccess.h>
37 #include <linux/inet.h>
38 #include <linux/idr.h>
39 #include <linux/file.h>
40 #include <linux/parser.h>
41 #include <net/9p/9p.h>
42 #include <net/9p/client.h>
43 #include <net/9p/transport.h>
46 #define MAX_SOCK_BUF (64*1024)
47 #define MAXPOLLWADDR 2
50 * struct p9_fd_opts - per-transport options
51 * @rfd: file descriptor for reading (trans=fd)
52 * @wfd: file descriptor for writing (trans=fd)
53 * @port: port to connect to (trans=tcp)
64 * struct p9_trans_fd - transport state
65 * @rd: reference to file to read from
66 * @wr: reference of file to write to
67 * @conn: connection state reference
78 * Option Parsing (code inspired by NFS code)
79 * - a little lazy - parse all fd-transport options
83 /* Options that take integer arguments */
84 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
87 static const match_table_t tokens = {
88 {Opt_port, "port=%u"},
89 {Opt_rfdno, "rfdno=%u"},
90 {Opt_wfdno, "wfdno=%u"},
95 Rworksched = 1, /* read work scheduled or running */
96 Rpending = 2, /* can read */
97 Wworksched = 4, /* write work scheduled or running */
98 Wpending = 8, /* can write */
101 struct p9_poll_wait {
102 struct p9_conn *conn;
104 wait_queue_head_t *wait_addr;
108 * struct p9_conn - fd mux connection state information
109 * @mux_list: list link for mux to manage multiple connections (?)
110 * @client: reference to client instance for this connection
112 * @req_list: accounting for requests which have been sent
113 * @unsent_req_list: accounting for requests that haven't been sent
114 * @req: current request being processed (if any)
115 * @tmp_buf: temporary buffer to read in header
116 * @rsize: amount to read for current frame
117 * @rpos: read position in current frame
118 * @rbuf: current read buffer
119 * @wpos: write position for current frame
120 * @wsize: amount of data to write for current frame
121 * @wbuf: current write buffer
122 * @poll_wait: array of wait_q's for various worker threads
125 * @rq: current read work
126 * @wq: current write work
132 struct list_head mux_list;
133 struct p9_client *client;
135 struct list_head req_list;
136 struct list_head unsent_req_list;
137 struct p9_req_t *req;
145 struct list_head poll_pending_link;
146 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
148 struct work_struct rq;
149 struct work_struct wq;
150 unsigned long wsched;
153 static DEFINE_SPINLOCK(p9_poll_lock);
154 static LIST_HEAD(p9_poll_pending_list);
155 static struct workqueue_struct *p9_mux_wq;
156 static struct task_struct *p9_poll_task;
158 static void p9_mux_poll_stop(struct p9_conn *m)
163 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
164 struct p9_poll_wait *pwait = &m->poll_wait[i];
166 if (pwait->wait_addr) {
167 remove_wait_queue(pwait->wait_addr, &pwait->wait);
168 pwait->wait_addr = NULL;
172 spin_lock_irqsave(&p9_poll_lock, flags);
173 list_del_init(&m->poll_pending_link);
174 spin_unlock_irqrestore(&p9_poll_lock, flags);
178 * p9_conn_cancel - cancel all pending requests with error
184 void p9_conn_cancel(struct p9_conn *m, int err)
186 struct p9_req_t *req, *rtmp;
188 LIST_HEAD(cancel_list);
190 P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
192 spin_lock_irqsave(&m->client->lock, flags);
193 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
194 req->status = REQ_STATUS_ERROR;
197 list_move(&req->req_list, &cancel_list);
199 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
200 req->status = REQ_STATUS_ERROR;
203 list_move(&req->req_list, &cancel_list);
205 spin_unlock_irqrestore(&m->client->lock, flags);
207 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
208 list_del(&req->req_list);
209 P9_DPRINTK(P9_DEBUG_ERROR, "call back req %p\n", req);
210 p9_client_cb(m->client, req);
215 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
218 struct p9_trans_fd *ts = NULL;
220 if (client && client->status == Connected)
226 if (!ts->rd->f_op || !ts->rd->f_op->poll)
229 if (!ts->wr->f_op || !ts->wr->f_op->poll)
232 ret = ts->rd->f_op->poll(ts->rd, pt);
236 if (ts->rd != ts->wr) {
237 n = ts->wr->f_op->poll(ts->wr, pt);
240 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
247 * p9_fd_read- read from a fd
248 * @client: client instance
249 * @v: buffer to receive data into
250 * @len: size of receive buffer
254 static int p9_fd_read(struct p9_client *client, void *v, int len)
257 struct p9_trans_fd *ts = NULL;
259 if (client && client->status != Disconnected)
265 if (!(ts->rd->f_flags & O_NONBLOCK))
266 P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
268 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
269 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
270 client->status = Disconnected;
275 * p9_read_work - called when there is some data to be read from a transport
276 * @work: container of work to be done
280 static void p9_read_work(struct work_struct *work)
285 m = container_of(work, struct p9_conn, rq);
290 P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
293 m->rbuf = m->tmp_buf;
295 m->rsize = 7; /* start by reading header */
298 clear_bit(Rpending, &m->wsched);
299 P9_DPRINTK(P9_DEBUG_MUX, "read mux %p pos %d size: %d = %d\n", m,
300 m->rpos, m->rsize, m->rsize-m->rpos);
301 err = p9_fd_read(m->client, m->rbuf + m->rpos,
303 P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err);
304 if (err == -EAGAIN) {
305 clear_bit(Rworksched, &m->wsched);
314 if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */
316 P9_DPRINTK(P9_DEBUG_MUX, "got new header\n");
318 n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */
319 if (n >= m->client->msize) {
320 P9_DPRINTK(P9_DEBUG_ERROR,
321 "requested packet size too big: %d\n", n);
326 tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */
327 P9_DPRINTK(P9_DEBUG_MUX, "mux %p pkt: size: %d bytes tag: %d\n",
330 m->req = p9_tag_lookup(m->client, tag);
332 P9_DPRINTK(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
338 if (m->req->rc == NULL) {
339 m->req->rc = kmalloc(sizeof(struct p9_fcall) +
340 m->client->msize, GFP_KERNEL);
347 m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall);
348 memcpy(m->rbuf, m->tmp_buf, m->rsize);
352 /* not an else because some packets (like clunk) have no payload */
353 if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */
354 P9_DPRINTK(P9_DEBUG_MUX, "got new packet\n");
356 list_del(&m->req->req_list);
357 p9_client_cb(m->client, m->req);
365 if (!list_empty(&m->req_list)) {
366 if (test_and_clear_bit(Rpending, &m->wsched))
369 n = p9_fd_poll(m->client, NULL);
372 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
373 queue_work(p9_mux_wq, &m->rq);
375 clear_bit(Rworksched, &m->wsched);
377 clear_bit(Rworksched, &m->wsched);
381 p9_conn_cancel(m, err);
382 clear_bit(Rworksched, &m->wsched);
386 * p9_fd_write - write to a socket
387 * @client: client instance
388 * @v: buffer to send data from
389 * @len: size of send buffer
393 static int p9_fd_write(struct p9_client *client, void *v, int len)
397 struct p9_trans_fd *ts = NULL;
399 if (client && client->status != Disconnected)
405 if (!(ts->wr->f_flags & O_NONBLOCK))
406 P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
410 /* The cast to a user pointer is valid due to the set_fs() */
411 ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos);
414 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
415 client->status = Disconnected;
420 * p9_write_work - called when a transport can send some data
421 * @work: container for work to be done
425 static void p9_write_work(struct work_struct *work)
429 struct p9_req_t *req;
431 m = container_of(work, struct p9_conn, wq);
434 clear_bit(Wworksched, &m->wsched);
439 if (list_empty(&m->unsent_req_list)) {
440 clear_bit(Wworksched, &m->wsched);
444 spin_lock(&m->client->lock);
445 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
447 req->status = REQ_STATUS_SENT;
448 list_move_tail(&req->req_list, &m->req_list);
450 m->wbuf = req->tc->sdata;
451 m->wsize = req->tc->size;
453 spin_unlock(&m->client->lock);
456 P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos,
458 clear_bit(Wpending, &m->wsched);
459 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
460 P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err);
461 if (err == -EAGAIN) {
462 clear_bit(Wworksched, &m->wsched);
474 if (m->wpos == m->wsize)
475 m->wpos = m->wsize = 0;
477 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
478 if (test_and_clear_bit(Wpending, &m->wsched))
481 n = p9_fd_poll(m->client, NULL);
484 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
485 queue_work(p9_mux_wq, &m->wq);
487 clear_bit(Wworksched, &m->wsched);
489 clear_bit(Wworksched, &m->wsched);
494 p9_conn_cancel(m, err);
495 clear_bit(Wworksched, &m->wsched);
498 static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key)
500 struct p9_poll_wait *pwait =
501 container_of(wait, struct p9_poll_wait, wait);
502 struct p9_conn *m = pwait->conn;
504 DECLARE_WAITQUEUE(dummy_wait, p9_poll_task);
506 spin_lock_irqsave(&p9_poll_lock, flags);
507 if (list_empty(&m->poll_pending_link))
508 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
509 spin_unlock_irqrestore(&p9_poll_lock, flags);
511 /* perform the default wake up operation */
512 return default_wake_function(&dummy_wait, mode, sync, key);
516 * p9_pollwait - add poll task to the wait queue
517 * @filp: file pointer being polled
518 * @wait_address: wait_q to block on
521 * called by files poll operation to add v9fs-poll task to files wait queue
525 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
527 struct p9_conn *m = container_of(p, struct p9_conn, pt);
528 struct p9_poll_wait *pwait = NULL;
531 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
532 if (m->poll_wait[i].wait_addr == NULL) {
533 pwait = &m->poll_wait[i];
539 P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
544 P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n");
545 pwait->wait_addr = ERR_PTR(-EIO);
550 pwait->wait_addr = wait_address;
551 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
552 add_wait_queue(wait_address, &pwait->wait);
556 * p9_conn_create - allocate and initialize the per-session mux data
557 * @client: client instance
559 * Note: Creates the polling task if this is the first session.
562 static struct p9_conn *p9_conn_create(struct p9_client *client)
567 P9_DPRINTK(P9_DEBUG_MUX, "client %p msize %d\n", client, client->msize);
568 m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
570 return ERR_PTR(-ENOMEM);
572 INIT_LIST_HEAD(&m->mux_list);
575 INIT_LIST_HEAD(&m->req_list);
576 INIT_LIST_HEAD(&m->unsent_req_list);
577 INIT_WORK(&m->rq, p9_read_work);
578 INIT_WORK(&m->wq, p9_write_work);
579 INIT_LIST_HEAD(&m->poll_pending_link);
580 init_poll_funcptr(&m->pt, p9_pollwait);
582 n = p9_fd_poll(client, &m->pt);
584 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
585 set_bit(Rpending, &m->wsched);
589 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
590 set_bit(Wpending, &m->wsched);
593 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
594 if (IS_ERR(m->poll_wait[i].wait_addr)) {
597 /* return the error code */
598 return (void *)m->poll_wait[i].wait_addr;
606 * p9_poll_mux - polls a mux and schedules read or write works if necessary
607 * @m: connection to poll
611 static void p9_poll_mux(struct p9_conn *m)
618 n = p9_fd_poll(m->client, NULL);
619 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
620 P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n);
623 p9_conn_cancel(m, n);
627 set_bit(Rpending, &m->wsched);
628 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
629 if (!test_and_set_bit(Rworksched, &m->wsched)) {
630 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
631 queue_work(p9_mux_wq, &m->rq);
636 set_bit(Wpending, &m->wsched);
637 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
638 if ((m->wsize || !list_empty(&m->unsent_req_list))
639 && !test_and_set_bit(Wworksched, &m->wsched)) {
640 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
641 queue_work(p9_mux_wq, &m->wq);
647 * p9_fd_request - send 9P request
648 * The function can sleep until the request is scheduled for sending.
649 * The function can be interrupted. Return from the function is not
650 * a guarantee that the request is sent successfully.
652 * @client: client instance
653 * @req: request to be sent
657 static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
660 struct p9_trans_fd *ts = client->trans;
661 struct p9_conn *m = ts->conn;
663 P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current,
664 req->tc, req->tc->id);
668 #ifdef CONFIG_NET_9P_DEBUG
669 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
672 p9_printfcall(buf, sizeof(buf), req->tc, client->dotu);
673 printk(KERN_NOTICE "<<< %p %s\n", m, buf);
677 req->status = REQ_STATUS_UNSENT;
679 spin_lock(&client->lock);
680 list_add_tail(&req->req_list, &m->unsent_req_list);
681 spin_unlock(&client->lock);
683 if (test_and_clear_bit(Wpending, &m->wsched))
686 n = p9_fd_poll(m->client, NULL);
688 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
689 queue_work(p9_mux_wq, &m->wq);
694 static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
696 struct p9_trans_fd *ts = client->trans;
697 struct p9_conn *m = ts->conn;
699 P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag);
701 spin_lock(&client->lock);
702 list_del(&req->req_list);
703 spin_unlock(&client->lock);
705 /* if a response was received for a request, do nothing */
706 if (req->rc || req->t_err) {
707 P9_DPRINTK(P9_DEBUG_MUX,
708 "mux %p req %p response already received\n", m, req);
712 if (req->status == REQ_STATUS_UNSENT) {
713 req->status = REQ_STATUS_FLSHD;
721 * parse_options - parse mount options into session structure
722 * @options: options string passed from mount
723 * @opts: transport-specific structure to parse options into
725 * Returns 0 upon success, -ERRNO upon failure
728 static int parse_opts(char *params, struct p9_fd_opts *opts)
731 substring_t args[MAX_OPT_ARGS];
736 opts->port = P9_PORT;
743 options = kstrdup(params, GFP_KERNEL);
745 P9_DPRINTK(P9_DEBUG_ERROR,
746 "failed to allocate copy of option string\n");
750 while ((p = strsep(&options, ",")) != NULL) {
755 token = match_token(p, tokens, args);
756 r = match_int(&args[0], &option);
758 P9_DPRINTK(P9_DEBUG_ERROR,
759 "integer field, but no integer?\n");
781 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
783 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
790 if (!ts->rd || !ts->wr) {
800 client->status = Connected;
805 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
809 csocket->sk->sk_allocation = GFP_NOIO;
810 fd = sock_map_fd(csocket, 0);
812 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
816 ret = p9_fd_open(client, fd, fd);
818 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n");
823 ((struct p9_trans_fd *)client->trans)->rd->f_flags |= O_NONBLOCK;
829 * p9_mux_destroy - cancels all pending requests and frees mux resources
834 static void p9_conn_destroy(struct p9_conn *m)
836 P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m,
837 m->mux_list.prev, m->mux_list.next);
840 cancel_work_sync(&m->rq);
841 cancel_work_sync(&m->wq);
843 p9_conn_cancel(m, -ECONNRESET);
850 * p9_fd_close - shutdown file descriptor transport
851 * @client: client instance
855 static void p9_fd_close(struct p9_client *client)
857 struct p9_trans_fd *ts;
866 client->status = Disconnected;
868 p9_conn_destroy(ts->conn);
879 * stolen from NFS - maybe should be made a generic function?
881 static inline int valid_ipaddr4(const char *buf)
883 int rc, count, in[4];
885 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
888 for (count = 0; count < 4; count++) {
896 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
899 struct socket *csocket;
900 struct sockaddr_in sin_server;
901 struct p9_fd_opts opts;
902 struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
904 err = parse_opts(args, &opts);
908 if (valid_ipaddr4(addr) < 0)
913 sin_server.sin_family = AF_INET;
914 sin_server.sin_addr.s_addr = in_aton(addr);
915 sin_server.sin_port = htons(opts.port);
916 sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
919 P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n");
924 err = csocket->ops->connect(csocket,
925 (struct sockaddr *)&sin_server,
926 sizeof(struct sockaddr_in), 0);
929 "p9_trans_tcp: problem connecting socket to %s\n",
934 err = p9_socket_open(client, csocket);
938 p = (struct p9_trans_fd *) client->trans;
939 p->conn = p9_conn_create(client);
940 if (IS_ERR(p->conn)) {
941 err = PTR_ERR(p->conn);
950 sock_release(csocket);
958 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
961 struct socket *csocket;
962 struct sockaddr_un sun_server;
963 struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
967 if (strlen(addr) > UNIX_PATH_MAX) {
968 P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
974 sun_server.sun_family = PF_UNIX;
975 strcpy(sun_server.sun_path, addr);
976 sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
977 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
978 sizeof(struct sockaddr_un) - 1, 0);
981 "p9_trans_unix: problem connecting socket: %s: %d\n",
986 err = p9_socket_open(client, csocket);
990 p = (struct p9_trans_fd *) client->trans;
991 p->conn = p9_conn_create(client);
992 if (IS_ERR(p->conn)) {
993 err = PTR_ERR(p->conn);
1002 sock_release(csocket);
1009 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1012 struct p9_fd_opts opts;
1013 struct p9_trans_fd *p = NULL; /* this get allocated in p9_fd_open */
1015 parse_opts(args, &opts);
1017 if (opts.rfd == ~0 || opts.wfd == ~0) {
1018 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
1019 return -ENOPROTOOPT;
1022 err = p9_fd_open(client, opts.rfd, opts.wfd);
1026 p = (struct p9_trans_fd *) client->trans;
1027 p->conn = p9_conn_create(client);
1028 if (IS_ERR(p->conn)) {
1029 err = PTR_ERR(p->conn);
1041 static struct p9_trans_module p9_tcp_trans = {
1043 .maxsize = MAX_SOCK_BUF,
1045 .create = p9_fd_create_tcp,
1046 .close = p9_fd_close,
1047 .request = p9_fd_request,
1048 .cancel = p9_fd_cancel,
1049 .owner = THIS_MODULE,
1052 static struct p9_trans_module p9_unix_trans = {
1054 .maxsize = MAX_SOCK_BUF,
1056 .create = p9_fd_create_unix,
1057 .close = p9_fd_close,
1058 .request = p9_fd_request,
1059 .cancel = p9_fd_cancel,
1060 .owner = THIS_MODULE,
1063 static struct p9_trans_module p9_fd_trans = {
1065 .maxsize = MAX_SOCK_BUF,
1067 .create = p9_fd_create,
1068 .close = p9_fd_close,
1069 .request = p9_fd_request,
1070 .cancel = p9_fd_cancel,
1071 .owner = THIS_MODULE,
1075 * p9_poll_proc - poll worker thread
1076 * @a: thread state and arguments
1078 * polls all v9fs transports for new events and queues the appropriate
1079 * work to the work queue
1083 static int p9_poll_proc(void *a)
1085 unsigned long flags;
1087 P9_DPRINTK(P9_DEBUG_MUX, "start %p\n", current);
1089 spin_lock_irqsave(&p9_poll_lock, flags);
1090 while (!list_empty(&p9_poll_pending_list)) {
1091 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1094 list_del_init(&conn->poll_pending_link);
1095 spin_unlock_irqrestore(&p9_poll_lock, flags);
1099 spin_lock_irqsave(&p9_poll_lock, flags);
1101 spin_unlock_irqrestore(&p9_poll_lock, flags);
1103 set_current_state(TASK_INTERRUPTIBLE);
1104 if (list_empty(&p9_poll_pending_list)) {
1105 P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n");
1108 __set_current_state(TASK_RUNNING);
1110 if (!kthread_should_stop())
1113 P9_DPRINTK(P9_DEBUG_MUX, "finish\n");
1117 int p9_trans_fd_init(void)
1119 p9_mux_wq = create_workqueue("v9fs");
1121 printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n");
1125 p9_poll_task = kthread_run(p9_poll_proc, NULL, "v9fs-poll");
1126 if (IS_ERR(p9_poll_task)) {
1127 destroy_workqueue(p9_mux_wq);
1128 printk(KERN_WARNING "v9fs: mux: creating poll task failed\n");
1129 return PTR_ERR(p9_poll_task);
1132 v9fs_register_trans(&p9_tcp_trans);
1133 v9fs_register_trans(&p9_unix_trans);
1134 v9fs_register_trans(&p9_fd_trans);
1139 void p9_trans_fd_exit(void)
1141 kthread_stop(p9_poll_task);
1142 v9fs_unregister_trans(&p9_tcp_trans);
1143 v9fs_unregister_trans(&p9_unix_trans);
1144 v9fs_unregister_trans(&p9_fd_trans);
1146 destroy_workqueue(p9_mux_wq);