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)
69 * struct p9_trans_fd - transport state
70 * @rd: reference to file to read from
71 * @wr: reference of file to write to
72 * @conn: connection state reference
83 * Option Parsing (code inspired by NFS code)
84 * - a little lazy - parse all fd-transport options
88 /* Options that take integer arguments */
89 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
92 static const match_table_t tokens = {
93 {Opt_port, "port=%u"},
94 {Opt_rfdno, "rfdno=%u"},
95 {Opt_wfdno, "wfdno=%u"},
100 Rworksched = 1, /* read work scheduled or running */
101 Rpending = 2, /* can read */
102 Wworksched = 4, /* write work scheduled or running */
103 Wpending = 8, /* can write */
106 struct p9_poll_wait {
107 struct p9_conn *conn;
109 wait_queue_head_t *wait_addr;
113 * struct p9_conn - fd mux connection state information
114 * @mux_list: list link for mux to manage multiple connections (?)
115 * @client: reference to client instance for this connection
117 * @req_list: accounting for requests which have been sent
118 * @unsent_req_list: accounting for requests that haven't been sent
119 * @req: current request being processed (if any)
120 * @tmp_buf: temporary buffer to read in header
121 * @rsize: amount to read for current frame
122 * @rpos: read position in current frame
123 * @rbuf: current read buffer
124 * @wpos: write position for current frame
125 * @wsize: amount of data to write for current frame
126 * @wbuf: current write buffer
127 * @poll_pending_link: pending links to be polled per conn
128 * @poll_wait: array of wait_q's for various worker threads
130 * @rq: current read work
131 * @wq: current write work
137 struct list_head mux_list;
138 struct p9_client *client;
140 struct list_head req_list;
141 struct list_head unsent_req_list;
142 struct p9_req_t *req;
150 struct list_head poll_pending_link;
151 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
153 struct work_struct rq;
154 struct work_struct wq;
155 unsigned long wsched;
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 void p9_mux_poll_stop(struct p9_conn *m)
169 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
170 struct p9_poll_wait *pwait = &m->poll_wait[i];
172 if (pwait->wait_addr) {
173 remove_wait_queue(pwait->wait_addr, &pwait->wait);
174 pwait->wait_addr = NULL;
178 spin_lock_irqsave(&p9_poll_lock, flags);
179 list_del_init(&m->poll_pending_link);
180 spin_unlock_irqrestore(&p9_poll_lock, flags);
184 * p9_conn_cancel - cancel all pending requests with error
190 static void p9_conn_cancel(struct p9_conn *m, int err)
192 struct p9_req_t *req, *rtmp;
194 LIST_HEAD(cancel_list);
196 p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
198 spin_lock_irqsave(&m->client->lock, flags);
201 spin_unlock_irqrestore(&m->client->lock, flags);
207 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
208 req->status = REQ_STATUS_ERROR;
211 list_move(&req->req_list, &cancel_list);
213 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
214 req->status = REQ_STATUS_ERROR;
217 list_move(&req->req_list, &cancel_list);
219 spin_unlock_irqrestore(&m->client->lock, flags);
221 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
222 p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req);
223 list_del(&req->req_list);
224 p9_client_cb(m->client, req);
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 || !ts->rd->f_op->poll)
243 if (!ts->wr->f_op || !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 %d\n", m, m->rpos);
307 m->rbuf = m->tmp_buf;
309 m->rsize = 7; /* start by reading header */
312 clear_bit(Rpending, &m->wsched);
313 p9_debug(P9_DEBUG_TRANS, "read mux %p pos %d size: %d = %d\n",
314 m, m->rpos, m->rsize, m->rsize-m->rpos);
315 err = p9_fd_read(m->client, m->rbuf + m->rpos,
317 p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err);
318 if (err == -EAGAIN) {
319 clear_bit(Rworksched, &m->wsched);
328 if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */
330 p9_debug(P9_DEBUG_TRANS, "got new header\n");
332 n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */
333 if (n >= m->client->msize) {
334 p9_debug(P9_DEBUG_ERROR,
335 "requested packet size too big: %d\n", n);
340 tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */
341 p9_debug(P9_DEBUG_TRANS,
342 "mux %p pkt: size: %d bytes tag: %d\n", m, n, tag);
344 m->req = p9_tag_lookup(m->client, tag);
345 if (!m->req || (m->req->status != REQ_STATUS_SENT &&
346 m->req->status != REQ_STATUS_FLSH)) {
347 p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
353 if (m->req->rc == NULL) {
354 m->req->rc = kmalloc(sizeof(struct p9_fcall) +
355 m->client->msize, GFP_NOFS);
362 m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall);
363 memcpy(m->rbuf, m->tmp_buf, m->rsize);
367 /* not an else because some packets (like clunk) have no payload */
368 if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */
369 p9_debug(P9_DEBUG_TRANS, "got new packet\n");
370 spin_lock(&m->client->lock);
371 if (m->req->status != REQ_STATUS_ERROR)
372 m->req->status = REQ_STATUS_RCVD;
373 list_del(&m->req->req_list);
374 spin_unlock(&m->client->lock);
375 p9_client_cb(m->client, m->req);
382 if (!list_empty(&m->req_list)) {
383 if (test_and_clear_bit(Rpending, &m->wsched))
386 n = p9_fd_poll(m->client, NULL);
389 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
390 schedule_work(&m->rq);
392 clear_bit(Rworksched, &m->wsched);
394 clear_bit(Rworksched, &m->wsched);
398 p9_conn_cancel(m, err);
399 clear_bit(Rworksched, &m->wsched);
403 * p9_fd_write - write to a socket
404 * @client: client instance
405 * @v: buffer to send data from
406 * @len: size of send buffer
410 static int p9_fd_write(struct p9_client *client, void *v, int len)
414 struct p9_trans_fd *ts = NULL;
416 if (client && client->status != Disconnected)
422 if (!(ts->wr->f_flags & O_NONBLOCK))
423 p9_debug(P9_DEBUG_ERROR, "blocking write ...\n");
427 /* The cast to a user pointer is valid due to the set_fs() */
428 ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos);
431 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
432 client->status = Disconnected;
437 * p9_write_work - called when a transport can send some data
438 * @work: container for work to be done
442 static void p9_write_work(struct work_struct *work)
446 struct p9_req_t *req;
448 m = container_of(work, struct p9_conn, wq);
451 clear_bit(Wworksched, &m->wsched);
456 if (list_empty(&m->unsent_req_list)) {
457 clear_bit(Wworksched, &m->wsched);
461 spin_lock(&m->client->lock);
462 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
464 req->status = REQ_STATUS_SENT;
465 p9_debug(P9_DEBUG_TRANS, "move req %p\n", req);
466 list_move_tail(&req->req_list, &m->req_list);
468 m->wbuf = req->tc->sdata;
469 m->wsize = req->tc->size;
471 spin_unlock(&m->client->lock);
474 p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n",
475 m, m->wpos, m->wsize);
476 clear_bit(Wpending, &m->wsched);
477 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
478 p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);
479 if (err == -EAGAIN) {
480 clear_bit(Wworksched, &m->wsched);
492 if (m->wpos == m->wsize)
493 m->wpos = m->wsize = 0;
495 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
496 if (test_and_clear_bit(Wpending, &m->wsched))
499 n = p9_fd_poll(m->client, NULL);
502 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
503 schedule_work(&m->wq);
505 clear_bit(Wworksched, &m->wsched);
507 clear_bit(Wworksched, &m->wsched);
512 p9_conn_cancel(m, err);
513 clear_bit(Wworksched, &m->wsched);
516 static int p9_pollwake(wait_queue_t *wait, unsigned int mode, int sync, void *key)
518 struct p9_poll_wait *pwait =
519 container_of(wait, struct p9_poll_wait, wait);
520 struct p9_conn *m = pwait->conn;
523 spin_lock_irqsave(&p9_poll_lock, flags);
524 if (list_empty(&m->poll_pending_link))
525 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
526 spin_unlock_irqrestore(&p9_poll_lock, flags);
528 schedule_work(&p9_poll_work);
533 * p9_pollwait - add poll task to the wait queue
534 * @filp: file pointer being polled
535 * @wait_address: wait_q to block on
538 * called by files poll operation to add v9fs-poll task to files wait queue
542 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
544 struct p9_conn *m = container_of(p, struct p9_conn, pt);
545 struct p9_poll_wait *pwait = NULL;
548 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
549 if (m->poll_wait[i].wait_addr == NULL) {
550 pwait = &m->poll_wait[i];
556 p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n");
561 pwait->wait_addr = wait_address;
562 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
563 add_wait_queue(wait_address, &pwait->wait);
567 * p9_conn_create - allocate and initialize the per-session mux data
568 * @client: client instance
570 * Note: Creates the polling task if this is the first session.
573 static struct p9_conn *p9_conn_create(struct p9_client *client)
578 p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize);
579 m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
581 return ERR_PTR(-ENOMEM);
583 INIT_LIST_HEAD(&m->mux_list);
586 INIT_LIST_HEAD(&m->req_list);
587 INIT_LIST_HEAD(&m->unsent_req_list);
588 INIT_WORK(&m->rq, p9_read_work);
589 INIT_WORK(&m->wq, p9_write_work);
590 INIT_LIST_HEAD(&m->poll_pending_link);
591 init_poll_funcptr(&m->pt, p9_pollwait);
593 n = p9_fd_poll(client, &m->pt);
595 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
596 set_bit(Rpending, &m->wsched);
600 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
601 set_bit(Wpending, &m->wsched);
608 * p9_poll_mux - polls a mux and schedules read or write works if necessary
609 * @m: connection to poll
613 static void p9_poll_mux(struct p9_conn *m)
620 n = p9_fd_poll(m->client, NULL);
621 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
622 p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);
625 p9_conn_cancel(m, n);
629 set_bit(Rpending, &m->wsched);
630 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
631 if (!test_and_set_bit(Rworksched, &m->wsched)) {
632 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
633 schedule_work(&m->rq);
638 set_bit(Wpending, &m->wsched);
639 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
640 if ((m->wsize || !list_empty(&m->unsent_req_list)) &&
641 !test_and_set_bit(Wworksched, &m->wsched)) {
642 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
643 schedule_work(&m->wq);
649 * p9_fd_request - send 9P request
650 * The function can sleep until the request is scheduled for sending.
651 * The function can be interrupted. Return from the function is not
652 * a guarantee that the request is sent successfully.
654 * @client: client instance
655 * @req: request to be sent
659 static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
662 struct p9_trans_fd *ts = client->trans;
663 struct p9_conn *m = ts->conn;
665 p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n",
666 m, current, req->tc, req->tc->id);
670 spin_lock(&client->lock);
671 req->status = REQ_STATUS_UNSENT;
672 list_add_tail(&req->req_list, &m->unsent_req_list);
673 spin_unlock(&client->lock);
675 if (test_and_clear_bit(Wpending, &m->wsched))
678 n = p9_fd_poll(m->client, NULL);
680 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
681 schedule_work(&m->wq);
686 static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
690 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
692 spin_lock(&client->lock);
694 if (req->status == REQ_STATUS_UNSENT) {
695 list_del(&req->req_list);
696 req->status = REQ_STATUS_FLSHD;
698 } else if (req->status == REQ_STATUS_SENT)
699 req->status = REQ_STATUS_FLSH;
701 spin_unlock(&client->lock);
707 * parse_opts - parse mount options into p9_fd_opts structure
708 * @params: options string passed from mount
709 * @opts: fd transport-specific structure to parse options into
711 * Returns 0 upon success, -ERRNO upon failure
714 static int parse_opts(char *params, struct p9_fd_opts *opts)
717 substring_t args[MAX_OPT_ARGS];
719 char *options, *tmp_options;
721 opts->port = P9_PORT;
728 tmp_options = kstrdup(params, GFP_KERNEL);
730 p9_debug(P9_DEBUG_ERROR,
731 "failed to allocate copy of option string\n");
734 options = tmp_options;
736 while ((p = strsep(&options, ",")) != NULL) {
741 token = match_token(p, tokens, args);
742 if (token != Opt_err) {
743 r = match_int(&args[0], &option);
745 p9_debug(P9_DEBUG_ERROR,
746 "integer field, but no integer?\n");
769 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
771 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
778 if (!ts->rd || !ts->wr) {
788 client->status = Connected;
793 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
795 struct p9_trans_fd *p;
799 p = kmalloc(sizeof(struct p9_trans_fd), GFP_KERNEL);
803 csocket->sk->sk_allocation = GFP_NOIO;
804 file = sock_alloc_file(csocket, 0, NULL);
806 pr_err("%s (%d): failed to map fd\n",
807 __func__, task_pid_nr(current));
808 sock_release(csocket);
810 return PTR_ERR(file);
814 p->wr = p->rd = file;
816 client->status = Connected;
818 p->rd->f_flags |= O_NONBLOCK;
820 p->conn = p9_conn_create(client);
821 if (IS_ERR(p->conn)) {
822 ret = PTR_ERR(p->conn);
833 * p9_mux_destroy - cancels all pending requests and frees mux resources
838 static void p9_conn_destroy(struct p9_conn *m)
840 p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n",
841 m, m->mux_list.prev, m->mux_list.next);
844 cancel_work_sync(&m->rq);
845 cancel_work_sync(&m->wq);
847 p9_conn_cancel(m, -ECONNRESET);
854 * p9_fd_close - shutdown file descriptor transport
855 * @client: client instance
859 static void p9_fd_close(struct p9_client *client)
861 struct p9_trans_fd *ts;
870 client->status = Disconnected;
872 p9_conn_destroy(ts->conn);
883 * stolen from NFS - maybe should be made a generic function?
885 static inline int valid_ipaddr4(const char *buf)
887 int rc, count, in[4];
889 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
892 for (count = 0; count < 4; count++) {
900 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
903 struct socket *csocket;
904 struct sockaddr_in sin_server;
905 struct p9_fd_opts opts;
907 err = parse_opts(args, &opts);
911 if (valid_ipaddr4(addr) < 0)
916 sin_server.sin_family = AF_INET;
917 sin_server.sin_addr.s_addr = in_aton(addr);
918 sin_server.sin_port = htons(opts.port);
919 err = __sock_create(read_pnet(¤t->nsproxy->net_ns), PF_INET,
920 SOCK_STREAM, IPPROTO_TCP, &csocket, 1);
922 pr_err("%s (%d): problem creating socket\n",
923 __func__, task_pid_nr(current));
927 err = csocket->ops->connect(csocket,
928 (struct sockaddr *)&sin_server,
929 sizeof(struct sockaddr_in), 0);
931 pr_err("%s (%d): problem connecting socket to %s\n",
932 __func__, task_pid_nr(current), addr);
933 sock_release(csocket);
937 return p9_socket_open(client, csocket);
941 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
944 struct socket *csocket;
945 struct sockaddr_un sun_server;
949 if (strlen(addr) >= UNIX_PATH_MAX) {
950 pr_err("%s (%d): address too long: %s\n",
951 __func__, task_pid_nr(current), addr);
952 return -ENAMETOOLONG;
955 sun_server.sun_family = PF_UNIX;
956 strcpy(sun_server.sun_path, addr);
957 err = __sock_create(read_pnet(¤t->nsproxy->net_ns), PF_UNIX,
958 SOCK_STREAM, 0, &csocket, 1);
960 pr_err("%s (%d): problem creating socket\n",
961 __func__, task_pid_nr(current));
965 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
966 sizeof(struct sockaddr_un) - 1, 0);
968 pr_err("%s (%d): problem connecting socket: %s: %d\n",
969 __func__, task_pid_nr(current), addr, err);
970 sock_release(csocket);
974 return p9_socket_open(client, csocket);
978 p9_fd_create(struct p9_client *client, const char *addr, char *args)
981 struct p9_fd_opts opts;
982 struct p9_trans_fd *p;
984 parse_opts(args, &opts);
986 if (opts.rfd == ~0 || opts.wfd == ~0) {
987 pr_err("Insufficient options for proto=fd\n");
991 err = p9_fd_open(client, opts.rfd, opts.wfd);
995 p = (struct p9_trans_fd *) client->trans;
996 p->conn = p9_conn_create(client);
997 if (IS_ERR(p->conn)) {
998 err = PTR_ERR(p->conn);
1008 static struct p9_trans_module p9_tcp_trans = {
1010 .maxsize = MAX_SOCK_BUF,
1012 .create = p9_fd_create_tcp,
1013 .close = p9_fd_close,
1014 .request = p9_fd_request,
1015 .cancel = p9_fd_cancel,
1016 .owner = THIS_MODULE,
1019 static struct p9_trans_module p9_unix_trans = {
1021 .maxsize = MAX_SOCK_BUF,
1023 .create = p9_fd_create_unix,
1024 .close = p9_fd_close,
1025 .request = p9_fd_request,
1026 .cancel = p9_fd_cancel,
1027 .owner = THIS_MODULE,
1030 static struct p9_trans_module p9_fd_trans = {
1032 .maxsize = MAX_SOCK_BUF,
1034 .create = p9_fd_create,
1035 .close = p9_fd_close,
1036 .request = p9_fd_request,
1037 .cancel = p9_fd_cancel,
1038 .owner = THIS_MODULE,
1042 * p9_poll_proc - poll worker thread
1043 * @a: thread state and arguments
1045 * polls all v9fs transports for new events and queues the appropriate
1046 * work to the work queue
1050 static void p9_poll_workfn(struct work_struct *work)
1052 unsigned long flags;
1054 p9_debug(P9_DEBUG_TRANS, "start %p\n", current);
1056 spin_lock_irqsave(&p9_poll_lock, flags);
1057 while (!list_empty(&p9_poll_pending_list)) {
1058 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1061 list_del_init(&conn->poll_pending_link);
1062 spin_unlock_irqrestore(&p9_poll_lock, flags);
1066 spin_lock_irqsave(&p9_poll_lock, flags);
1068 spin_unlock_irqrestore(&p9_poll_lock, flags);
1070 p9_debug(P9_DEBUG_TRANS, "finish\n");
1073 int p9_trans_fd_init(void)
1075 v9fs_register_trans(&p9_tcp_trans);
1076 v9fs_register_trans(&p9_unix_trans);
1077 v9fs_register_trans(&p9_fd_trans);
1082 void p9_trans_fd_exit(void)
1084 flush_work(&p9_poll_work);
1085 v9fs_unregister_trans(&p9_tcp_trans);
1086 v9fs_unregister_trans(&p9_unix_trans);
1087 v9fs_unregister_trans(&p9_fd_trans);