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);
187 * p9_conn_cancel - cancel all pending requests with error
193 static void p9_conn_cancel(struct p9_conn *m, int err)
195 struct p9_req_t *req, *rtmp;
197 LIST_HEAD(cancel_list);
199 p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
201 spin_lock_irqsave(&m->client->lock, flags);
204 spin_unlock_irqrestore(&m->client->lock, flags);
210 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
211 list_move(&req->req_list, &cancel_list);
213 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
214 list_move(&req->req_list, &cancel_list);
216 spin_unlock_irqrestore(&m->client->lock, flags);
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);
228 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
231 struct p9_trans_fd *ts = NULL;
233 if (client && client->status == Connected)
239 if (!ts->rd->f_op->poll)
242 if (!ts->wr->f_op->poll)
245 ret = ts->rd->f_op->poll(ts->rd, pt);
249 if (ts->rd != ts->wr) {
250 n = ts->wr->f_op->poll(ts->wr, pt);
253 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
260 * p9_fd_read- read from a fd
261 * @client: client instance
262 * @v: buffer to receive data into
263 * @len: size of receive buffer
267 static int p9_fd_read(struct p9_client *client, void *v, int len)
270 struct p9_trans_fd *ts = NULL;
272 if (client && client->status != Disconnected)
278 if (!(ts->rd->f_flags & O_NONBLOCK))
279 p9_debug(P9_DEBUG_ERROR, "blocking read ...\n");
281 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
282 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
283 client->status = Disconnected;
288 * p9_read_work - called when there is some data to be read from a transport
289 * @work: container of work to be done
293 static void p9_read_work(struct work_struct *work)
297 int status = REQ_STATUS_ERROR;
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 m->req->rc = kmalloc(sizeof(struct p9_fcall) +
360 m->client->msize, GFP_NOFS);
367 m->rc.sdata = (char *)m->req->rc + sizeof(struct p9_fcall);
368 memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity);
369 m->rc.capacity = m->rc.size;
373 * not an else because some packets (like clunk) have no payload
375 if ((m->req) && (m->rc.offset == m->rc.capacity)) {
376 p9_debug(P9_DEBUG_TRANS, "got new packet\n");
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 spin_unlock(&m->client->lock);
382 p9_client_cb(m->client, m->req, status);
390 clear_bit(Rworksched, &m->wsched);
392 if (!list_empty(&m->req_list)) {
393 if (test_and_clear_bit(Rpending, &m->wsched))
396 n = p9_fd_poll(m->client, NULL);
398 if ((n & POLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) {
399 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
400 schedule_work(&m->rq);
406 p9_conn_cancel(m, err);
407 clear_bit(Rworksched, &m->wsched);
411 * p9_fd_write - write to a socket
412 * @client: client instance
413 * @v: buffer to send data from
414 * @len: size of send buffer
418 static int p9_fd_write(struct p9_client *client, void *v, int len)
422 struct p9_trans_fd *ts = NULL;
424 if (client && client->status != Disconnected)
430 if (!(ts->wr->f_flags & O_NONBLOCK))
431 p9_debug(P9_DEBUG_ERROR, "blocking write ...\n");
435 /* The cast to a user pointer is valid due to the set_fs() */
436 ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos);
439 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
440 client->status = Disconnected;
445 * p9_write_work - called when a transport can send some data
446 * @work: container for work to be done
450 static void p9_write_work(struct work_struct *work)
454 struct p9_req_t *req;
456 m = container_of(work, struct p9_conn, wq);
459 clear_bit(Wworksched, &m->wsched);
464 spin_lock(&m->client->lock);
465 if (list_empty(&m->unsent_req_list)) {
466 clear_bit(Wworksched, &m->wsched);
467 spin_unlock(&m->client->lock);
471 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
473 req->status = REQ_STATUS_SENT;
474 p9_debug(P9_DEBUG_TRANS, "move req %p\n", req);
475 list_move_tail(&req->req_list, &m->req_list);
477 m->wbuf = req->tc->sdata;
478 m->wsize = req->tc->size;
480 spin_unlock(&m->client->lock);
483 p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n",
484 m, m->wpos, m->wsize);
485 clear_bit(Wpending, &m->wsched);
486 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
487 p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);
500 if (m->wpos == m->wsize)
501 m->wpos = m->wsize = 0;
504 clear_bit(Wworksched, &m->wsched);
506 if (m->wsize || !list_empty(&m->unsent_req_list)) {
507 if (test_and_clear_bit(Wpending, &m->wsched))
510 n = p9_fd_poll(m->client, NULL);
513 !test_and_set_bit(Wworksched, &m->wsched)) {
514 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
515 schedule_work(&m->wq);
522 p9_conn_cancel(m, err);
523 clear_bit(Wworksched, &m->wsched);
526 static int p9_pollwake(wait_queue_t *wait, unsigned int mode, int sync, void *key)
528 struct p9_poll_wait *pwait =
529 container_of(wait, struct p9_poll_wait, wait);
530 struct p9_conn *m = pwait->conn;
533 spin_lock_irqsave(&p9_poll_lock, flags);
534 if (list_empty(&m->poll_pending_link))
535 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
536 spin_unlock_irqrestore(&p9_poll_lock, flags);
538 schedule_work(&p9_poll_work);
543 * p9_pollwait - add poll task to the wait queue
544 * @filp: file pointer being polled
545 * @wait_address: wait_q to block on
548 * called by files poll operation to add v9fs-poll task to files wait queue
552 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
554 struct p9_conn *m = container_of(p, struct p9_conn, pt);
555 struct p9_poll_wait *pwait = NULL;
558 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
559 if (m->poll_wait[i].wait_addr == NULL) {
560 pwait = &m->poll_wait[i];
566 p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n");
571 pwait->wait_addr = wait_address;
572 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
573 add_wait_queue(wait_address, &pwait->wait);
577 * p9_conn_create - initialize the per-session mux data
578 * @client: client instance
580 * Note: Creates the polling task if this is the first session.
583 static void p9_conn_create(struct p9_client *client)
586 struct p9_trans_fd *ts = client->trans;
587 struct p9_conn *m = &ts->conn;
589 p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize);
591 INIT_LIST_HEAD(&m->mux_list);
594 INIT_LIST_HEAD(&m->req_list);
595 INIT_LIST_HEAD(&m->unsent_req_list);
596 INIT_WORK(&m->rq, p9_read_work);
597 INIT_WORK(&m->wq, p9_write_work);
598 INIT_LIST_HEAD(&m->poll_pending_link);
599 init_poll_funcptr(&m->pt, p9_pollwait);
601 n = p9_fd_poll(client, &m->pt);
603 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
604 set_bit(Rpending, &m->wsched);
608 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
609 set_bit(Wpending, &m->wsched);
614 * p9_poll_mux - polls a mux and schedules read or write works if necessary
615 * @m: connection to poll
619 static void p9_poll_mux(struct p9_conn *m)
626 n = p9_fd_poll(m->client, NULL);
627 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
628 p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);
631 p9_conn_cancel(m, n);
635 set_bit(Rpending, &m->wsched);
636 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
637 if (!test_and_set_bit(Rworksched, &m->wsched)) {
638 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
639 schedule_work(&m->rq);
644 set_bit(Wpending, &m->wsched);
645 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
646 if ((m->wsize || !list_empty(&m->unsent_req_list)) &&
647 !test_and_set_bit(Wworksched, &m->wsched)) {
648 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
649 schedule_work(&m->wq);
655 * p9_fd_request - send 9P request
656 * The function can sleep until the request is scheduled for sending.
657 * The function can be interrupted. Return from the function is not
658 * a guarantee that the request is sent successfully.
660 * @client: client instance
661 * @req: request to be sent
665 static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
668 struct p9_trans_fd *ts = client->trans;
669 struct p9_conn *m = &ts->conn;
671 p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n",
672 m, current, req->tc, req->tc->id);
676 spin_lock(&client->lock);
677 req->status = REQ_STATUS_UNSENT;
678 list_add_tail(&req->req_list, &m->unsent_req_list);
679 spin_unlock(&client->lock);
681 if (test_and_clear_bit(Wpending, &m->wsched))
684 n = p9_fd_poll(m->client, NULL);
686 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
687 schedule_work(&m->wq);
692 static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
696 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
698 spin_lock(&client->lock);
700 if (req->status == REQ_STATUS_UNSENT) {
701 list_del(&req->req_list);
702 req->status = REQ_STATUS_FLSHD;
705 spin_unlock(&client->lock);
710 static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req)
712 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
714 /* we haven't received a response for oldreq,
715 * remove it from the list.
717 spin_lock(&client->lock);
718 list_del(&req->req_list);
719 spin_unlock(&client->lock);
725 * parse_opts - parse mount options into p9_fd_opts structure
726 * @params: options string passed from mount
727 * @opts: fd transport-specific structure to parse options into
729 * Returns 0 upon success, -ERRNO upon failure
732 static int parse_opts(char *params, struct p9_fd_opts *opts)
735 substring_t args[MAX_OPT_ARGS];
737 char *options, *tmp_options;
739 opts->port = P9_PORT;
747 tmp_options = kstrdup(params, GFP_KERNEL);
749 p9_debug(P9_DEBUG_ERROR,
750 "failed to allocate copy of option string\n");
753 options = tmp_options;
755 while ((p = strsep(&options, ",")) != NULL) {
760 token = match_token(p, tokens, args);
761 if ((token != Opt_err) && (token != Opt_privport)) {
762 r = match_int(&args[0], &option);
764 p9_debug(P9_DEBUG_ERROR,
765 "integer field, but no integer?\n");
791 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
793 struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd),
800 if (!ts->rd || !ts->wr) {
810 client->status = Connected;
815 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
817 struct p9_trans_fd *p;
820 p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL);
824 csocket->sk->sk_allocation = GFP_NOIO;
825 file = sock_alloc_file(csocket, 0, NULL);
827 pr_err("%s (%d): failed to map fd\n",
828 __func__, task_pid_nr(current));
829 sock_release(csocket);
831 return PTR_ERR(file);
835 p->wr = p->rd = file;
837 client->status = Connected;
839 p->rd->f_flags |= O_NONBLOCK;
841 p9_conn_create(client);
846 * p9_mux_destroy - cancels all pending requests of mux
851 static void p9_conn_destroy(struct p9_conn *m)
853 p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n",
854 m, m->mux_list.prev, m->mux_list.next);
857 cancel_work_sync(&m->rq);
858 cancel_work_sync(&m->wq);
860 p9_conn_cancel(m, -ECONNRESET);
866 * p9_fd_close - shutdown file descriptor transport
867 * @client: client instance
871 static void p9_fd_close(struct p9_client *client)
873 struct p9_trans_fd *ts;
882 client->status = Disconnected;
884 p9_conn_destroy(&ts->conn);
895 * stolen from NFS - maybe should be made a generic function?
897 static inline int valid_ipaddr4(const char *buf)
899 int rc, count, in[4];
901 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
904 for (count = 0; count < 4; count++) {
911 static int p9_bind_privport(struct socket *sock)
913 struct sockaddr_in cl;
914 int port, err = -EINVAL;
916 memset(&cl, 0, sizeof(cl));
917 cl.sin_family = AF_INET;
918 cl.sin_addr.s_addr = INADDR_ANY;
919 for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) {
920 cl.sin_port = htons((ushort)port);
921 err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl));
922 if (err != -EADDRINUSE)
930 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
933 struct socket *csocket;
934 struct sockaddr_in sin_server;
935 struct p9_fd_opts opts;
937 err = parse_opts(args, &opts);
941 if (valid_ipaddr4(addr) < 0)
946 sin_server.sin_family = AF_INET;
947 sin_server.sin_addr.s_addr = in_aton(addr);
948 sin_server.sin_port = htons(opts.port);
949 err = __sock_create(current->nsproxy->net_ns, PF_INET,
950 SOCK_STREAM, IPPROTO_TCP, &csocket, 1);
952 pr_err("%s (%d): problem creating socket\n",
953 __func__, task_pid_nr(current));
958 err = p9_bind_privport(csocket);
960 pr_err("%s (%d): problem binding to privport\n",
961 __func__, task_pid_nr(current));
962 sock_release(csocket);
967 err = csocket->ops->connect(csocket,
968 (struct sockaddr *)&sin_server,
969 sizeof(struct sockaddr_in), 0);
971 pr_err("%s (%d): problem connecting socket to %s\n",
972 __func__, task_pid_nr(current), addr);
973 sock_release(csocket);
977 return p9_socket_open(client, csocket);
981 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
984 struct socket *csocket;
985 struct sockaddr_un sun_server;
989 if (strlen(addr) >= UNIX_PATH_MAX) {
990 pr_err("%s (%d): address too long: %s\n",
991 __func__, task_pid_nr(current), addr);
992 return -ENAMETOOLONG;
995 sun_server.sun_family = PF_UNIX;
996 strcpy(sun_server.sun_path, addr);
997 err = __sock_create(current->nsproxy->net_ns, PF_UNIX,
998 SOCK_STREAM, 0, &csocket, 1);
1000 pr_err("%s (%d): problem creating socket\n",
1001 __func__, task_pid_nr(current));
1005 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1006 sizeof(struct sockaddr_un) - 1, 0);
1008 pr_err("%s (%d): problem connecting socket: %s: %d\n",
1009 __func__, task_pid_nr(current), addr, err);
1010 sock_release(csocket);
1014 return p9_socket_open(client, csocket);
1018 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1021 struct p9_fd_opts opts;
1023 parse_opts(args, &opts);
1025 if (opts.rfd == ~0 || opts.wfd == ~0) {
1026 pr_err("Insufficient options for proto=fd\n");
1027 return -ENOPROTOOPT;
1030 err = p9_fd_open(client, opts.rfd, opts.wfd);
1034 p9_conn_create(client);
1039 static struct p9_trans_module p9_tcp_trans = {
1041 .maxsize = MAX_SOCK_BUF,
1043 .create = p9_fd_create_tcp,
1044 .close = p9_fd_close,
1045 .request = p9_fd_request,
1046 .cancel = p9_fd_cancel,
1047 .cancelled = p9_fd_cancelled,
1048 .owner = THIS_MODULE,
1051 static struct p9_trans_module p9_unix_trans = {
1053 .maxsize = MAX_SOCK_BUF,
1055 .create = p9_fd_create_unix,
1056 .close = p9_fd_close,
1057 .request = p9_fd_request,
1058 .cancel = p9_fd_cancel,
1059 .cancelled = p9_fd_cancelled,
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 .cancelled = p9_fd_cancelled,
1072 .owner = THIS_MODULE,
1076 * p9_poll_proc - poll worker thread
1077 * @a: thread state and arguments
1079 * polls all v9fs transports for new events and queues the appropriate
1080 * work to the work queue
1084 static void p9_poll_workfn(struct work_struct *work)
1086 unsigned long flags;
1088 p9_debug(P9_DEBUG_TRANS, "start %p\n", current);
1090 spin_lock_irqsave(&p9_poll_lock, flags);
1091 while (!list_empty(&p9_poll_pending_list)) {
1092 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1095 list_del_init(&conn->poll_pending_link);
1096 spin_unlock_irqrestore(&p9_poll_lock, flags);
1100 spin_lock_irqsave(&p9_poll_lock, flags);
1102 spin_unlock_irqrestore(&p9_poll_lock, flags);
1104 p9_debug(P9_DEBUG_TRANS, "finish\n");
1107 int p9_trans_fd_init(void)
1109 v9fs_register_trans(&p9_tcp_trans);
1110 v9fs_register_trans(&p9_unix_trans);
1111 v9fs_register_trans(&p9_fd_trans);
1116 void p9_trans_fd_exit(void)
1118 flush_work(&p9_poll_work);
1119 v9fs_unregister_trans(&p9_tcp_trans);
1120 v9fs_unregister_trans(&p9_unix_trans);
1121 v9fs_unregister_trans(&p9_fd_trans);