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 * @rsize: amount to read for current frame
112 * @rpos: read position in current frame
113 * @rbuf: current read buffer
114 * @wpos: write position for current frame
115 * @wsize: amount of data to write for current frame
116 * @wbuf: current write buffer
117 * @poll_pending_link: pending links to be polled per conn
118 * @poll_wait: array of wait_q's for various worker threads
120 * @rq: current read work
121 * @wq: current write work
127 struct list_head mux_list;
128 struct p9_client *client;
130 struct list_head req_list;
131 struct list_head unsent_req_list;
132 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);
189 flush_work(&p9_poll_work);
193 * p9_conn_cancel - cancel all pending requests with error
199 static void p9_conn_cancel(struct p9_conn *m, int err)
201 struct p9_req_t *req, *rtmp;
203 LIST_HEAD(cancel_list);
205 p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
207 spin_lock_irqsave(&m->client->lock, flags);
210 spin_unlock_irqrestore(&m->client->lock, flags);
216 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
217 list_move(&req->req_list, &cancel_list);
219 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
220 list_move(&req->req_list, &cancel_list);
222 spin_unlock_irqrestore(&m->client->lock, flags);
224 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
225 p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req);
226 list_del(&req->req_list);
229 p9_client_cb(m->client, req, REQ_STATUS_ERROR);
234 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
237 struct p9_trans_fd *ts = NULL;
239 if (client && client->status == Connected)
245 if (!ts->rd->f_op->poll)
248 if (!ts->wr->f_op->poll)
251 ret = ts->rd->f_op->poll(ts->rd, pt);
255 if (ts->rd != ts->wr) {
256 n = ts->wr->f_op->poll(ts->wr, pt);
259 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
266 * p9_fd_read- read from a fd
267 * @client: client instance
268 * @v: buffer to receive data into
269 * @len: size of receive buffer
273 static int p9_fd_read(struct p9_client *client, void *v, int len)
276 struct p9_trans_fd *ts = NULL;
278 if (client && client->status != Disconnected)
284 if (!(ts->rd->f_flags & O_NONBLOCK))
285 p9_debug(P9_DEBUG_ERROR, "blocking read ...\n");
287 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
288 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
289 client->status = Disconnected;
294 * p9_read_work - called when there is some data to be read from a transport
295 * @work: container of work to be done
299 static void p9_read_work(struct work_struct *work)
303 int status = REQ_STATUS_ERROR;
305 m = container_of(work, struct p9_conn, rq);
310 p9_debug(P9_DEBUG_TRANS, "start mux %p pos %d\n", m, m->rpos);
313 m->rbuf = m->tmp_buf;
315 m->rsize = 7; /* start by reading header */
318 clear_bit(Rpending, &m->wsched);
319 p9_debug(P9_DEBUG_TRANS, "read mux %p pos %d size: %d = %d\n",
320 m, m->rpos, m->rsize, m->rsize-m->rpos);
321 err = p9_fd_read(m->client, m->rbuf + m->rpos,
323 p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err);
324 if (err == -EAGAIN) {
333 if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */
335 p9_debug(P9_DEBUG_TRANS, "got new header\n");
337 n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */
338 if (n >= m->client->msize) {
339 p9_debug(P9_DEBUG_ERROR,
340 "requested packet size too big: %d\n", n);
345 tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */
346 p9_debug(P9_DEBUG_TRANS,
347 "mux %p pkt: size: %d bytes tag: %d\n", m, n, tag);
349 m->req = p9_tag_lookup(m->client, tag);
350 if (!m->req || (m->req->status != REQ_STATUS_SENT)) {
351 p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
357 if (m->req->rc == NULL) {
358 m->req->rc = kmalloc(sizeof(struct p9_fcall) +
359 m->client->msize, GFP_NOFS);
366 m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall);
367 memcpy(m->rbuf, m->tmp_buf, m->rsize);
371 /* not an else because some packets (like clunk) have no payload */
372 if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */
373 p9_debug(P9_DEBUG_TRANS, "got new packet\n");
374 spin_lock(&m->client->lock);
375 if (m->req->status != REQ_STATUS_ERROR)
376 status = REQ_STATUS_RCVD;
377 list_del(&m->req->req_list);
378 spin_unlock(&m->client->lock);
379 p9_client_cb(m->client, m->req, status);
387 clear_bit(Rworksched, &m->wsched);
389 if (!list_empty(&m->req_list)) {
390 if (test_and_clear_bit(Rpending, &m->wsched))
393 n = p9_fd_poll(m->client, NULL);
395 if ((n & POLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) {
396 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
397 schedule_work(&m->rq);
403 p9_conn_cancel(m, err);
404 clear_bit(Rworksched, &m->wsched);
408 * p9_fd_write - write to a socket
409 * @client: client instance
410 * @v: buffer to send data from
411 * @len: size of send buffer
415 static int p9_fd_write(struct p9_client *client, void *v, int len)
419 struct p9_trans_fd *ts = NULL;
421 if (client && client->status != Disconnected)
427 if (!(ts->wr->f_flags & O_NONBLOCK))
428 p9_debug(P9_DEBUG_ERROR, "blocking write ...\n");
432 /* The cast to a user pointer is valid due to the set_fs() */
433 ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos);
436 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
437 client->status = Disconnected;
442 * p9_write_work - called when a transport can send some data
443 * @work: container for work to be done
447 static void p9_write_work(struct work_struct *work)
451 struct p9_req_t *req;
453 m = container_of(work, struct p9_conn, wq);
456 clear_bit(Wworksched, &m->wsched);
461 spin_lock(&m->client->lock);
462 if (list_empty(&m->unsent_req_list)) {
463 clear_bit(Wworksched, &m->wsched);
464 spin_unlock(&m->client->lock);
468 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
470 req->status = REQ_STATUS_SENT;
471 p9_debug(P9_DEBUG_TRANS, "move req %p\n", req);
472 list_move_tail(&req->req_list, &m->req_list);
474 m->wbuf = req->tc->sdata;
475 m->wsize = req->tc->size;
477 spin_unlock(&m->client->lock);
480 p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n",
481 m, m->wpos, m->wsize);
482 clear_bit(Wpending, &m->wsched);
483 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
484 p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);
497 if (m->wpos == m->wsize)
498 m->wpos = m->wsize = 0;
501 clear_bit(Wworksched, &m->wsched);
503 if (m->wsize || !list_empty(&m->unsent_req_list)) {
504 if (test_and_clear_bit(Wpending, &m->wsched))
507 n = p9_fd_poll(m->client, NULL);
510 !test_and_set_bit(Wworksched, &m->wsched)) {
511 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
512 schedule_work(&m->wq);
519 p9_conn_cancel(m, err);
520 clear_bit(Wworksched, &m->wsched);
523 static int p9_pollwake(wait_queue_t *wait, unsigned int mode, int sync, void *key)
525 struct p9_poll_wait *pwait =
526 container_of(wait, struct p9_poll_wait, wait);
527 struct p9_conn *m = pwait->conn;
530 spin_lock_irqsave(&p9_poll_lock, flags);
531 if (list_empty(&m->poll_pending_link))
532 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
533 spin_unlock_irqrestore(&p9_poll_lock, flags);
535 schedule_work(&p9_poll_work);
540 * p9_pollwait - add poll task to the wait queue
541 * @filp: file pointer being polled
542 * @wait_address: wait_q to block on
545 * called by files poll operation to add v9fs-poll task to files wait queue
549 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
551 struct p9_conn *m = container_of(p, struct p9_conn, pt);
552 struct p9_poll_wait *pwait = NULL;
555 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
556 if (m->poll_wait[i].wait_addr == NULL) {
557 pwait = &m->poll_wait[i];
563 p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n");
568 pwait->wait_addr = wait_address;
569 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
570 add_wait_queue(wait_address, &pwait->wait);
574 * p9_conn_create - initialize the per-session mux data
575 * @client: client instance
577 * Note: Creates the polling task if this is the first session.
580 static void p9_conn_create(struct p9_client *client)
583 struct p9_trans_fd *ts = client->trans;
584 struct p9_conn *m = &ts->conn;
586 p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize);
588 INIT_LIST_HEAD(&m->mux_list);
591 INIT_LIST_HEAD(&m->req_list);
592 INIT_LIST_HEAD(&m->unsent_req_list);
593 INIT_WORK(&m->rq, p9_read_work);
594 INIT_WORK(&m->wq, p9_write_work);
595 INIT_LIST_HEAD(&m->poll_pending_link);
596 init_poll_funcptr(&m->pt, p9_pollwait);
598 n = p9_fd_poll(client, &m->pt);
600 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
601 set_bit(Rpending, &m->wsched);
605 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
606 set_bit(Wpending, &m->wsched);
611 * p9_poll_mux - polls a mux and schedules read or write works if necessary
612 * @m: connection to poll
616 static void p9_poll_mux(struct p9_conn *m)
623 n = p9_fd_poll(m->client, NULL);
624 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
625 p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);
628 p9_conn_cancel(m, n);
632 set_bit(Rpending, &m->wsched);
633 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
634 if (!test_and_set_bit(Rworksched, &m->wsched)) {
635 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
636 schedule_work(&m->rq);
641 set_bit(Wpending, &m->wsched);
642 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
643 if ((m->wsize || !list_empty(&m->unsent_req_list)) &&
644 !test_and_set_bit(Wworksched, &m->wsched)) {
645 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
646 schedule_work(&m->wq);
652 * p9_fd_request - send 9P request
653 * The function can sleep until the request is scheduled for sending.
654 * The function can be interrupted. Return from the function is not
655 * a guarantee that the request is sent successfully.
657 * @client: client instance
658 * @req: request to be sent
662 static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
665 struct p9_trans_fd *ts = client->trans;
666 struct p9_conn *m = &ts->conn;
668 p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n",
669 m, current, req->tc, req->tc->id);
673 spin_lock(&client->lock);
674 req->status = REQ_STATUS_UNSENT;
675 list_add_tail(&req->req_list, &m->unsent_req_list);
676 spin_unlock(&client->lock);
678 if (test_and_clear_bit(Wpending, &m->wsched))
681 n = p9_fd_poll(m->client, NULL);
683 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
684 schedule_work(&m->wq);
689 static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
693 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
695 spin_lock(&client->lock);
697 if (req->status == REQ_STATUS_UNSENT) {
698 list_del(&req->req_list);
699 req->status = REQ_STATUS_FLSHD;
702 spin_unlock(&client->lock);
707 static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req)
709 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
711 /* we haven't received a response for oldreq,
712 * remove it from the list.
714 spin_lock(&client->lock);
715 list_del(&req->req_list);
716 spin_unlock(&client->lock);
722 * parse_opts - parse mount options into p9_fd_opts structure
723 * @params: options string passed from mount
724 * @opts: fd transport-specific structure to parse options into
726 * Returns 0 upon success, -ERRNO upon failure
729 static int parse_opts(char *params, struct p9_fd_opts *opts)
732 substring_t args[MAX_OPT_ARGS];
734 char *options, *tmp_options;
736 opts->port = P9_PORT;
744 tmp_options = kstrdup(params, GFP_KERNEL);
746 p9_debug(P9_DEBUG_ERROR,
747 "failed to allocate copy of option string\n");
750 options = tmp_options;
752 while ((p = strsep(&options, ",")) != NULL) {
757 token = match_token(p, tokens, args);
758 if ((token != Opt_err) && (token != Opt_privport)) {
759 r = match_int(&args[0], &option);
761 p9_debug(P9_DEBUG_ERROR,
762 "integer field, but no integer?\n");
788 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
790 struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd),
798 if (!(ts->rd->f_mode & FMODE_READ))
803 if (!(ts->wr->f_mode & FMODE_WRITE))
807 client->status = Connected;
820 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
822 struct p9_trans_fd *p;
825 p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL);
829 csocket->sk->sk_allocation = GFP_NOIO;
830 file = sock_alloc_file(csocket, 0, NULL);
832 pr_err("%s (%d): failed to map fd\n",
833 __func__, task_pid_nr(current));
834 sock_release(csocket);
836 return PTR_ERR(file);
840 p->wr = p->rd = file;
842 client->status = Connected;
844 p->rd->f_flags |= O_NONBLOCK;
846 p9_conn_create(client);
851 * p9_mux_destroy - cancels all pending requests of mux
856 static void p9_conn_destroy(struct p9_conn *m)
858 p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n",
859 m, m->mux_list.prev, m->mux_list.next);
862 cancel_work_sync(&m->rq);
863 cancel_work_sync(&m->wq);
865 p9_conn_cancel(m, -ECONNRESET);
871 * p9_fd_close - shutdown file descriptor transport
872 * @client: client instance
876 static void p9_fd_close(struct p9_client *client)
878 struct p9_trans_fd *ts;
887 client->status = Disconnected;
889 p9_conn_destroy(&ts->conn);
900 * stolen from NFS - maybe should be made a generic function?
902 static inline int valid_ipaddr4(const char *buf)
904 int rc, count, in[4];
906 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
909 for (count = 0; count < 4; count++) {
916 static int p9_bind_privport(struct socket *sock)
918 struct sockaddr_in cl;
919 int port, err = -EINVAL;
921 memset(&cl, 0, sizeof(cl));
922 cl.sin_family = AF_INET;
923 cl.sin_addr.s_addr = INADDR_ANY;
924 for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) {
925 cl.sin_port = htons((ushort)port);
926 err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl));
927 if (err != -EADDRINUSE)
935 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
938 struct socket *csocket;
939 struct sockaddr_in sin_server;
940 struct p9_fd_opts opts;
942 err = parse_opts(args, &opts);
946 if (addr == NULL || valid_ipaddr4(addr) < 0)
951 sin_server.sin_family = AF_INET;
952 sin_server.sin_addr.s_addr = in_aton(addr);
953 sin_server.sin_port = htons(opts.port);
954 err = __sock_create(current->nsproxy->net_ns, PF_INET,
955 SOCK_STREAM, IPPROTO_TCP, &csocket, 1);
957 pr_err("%s (%d): problem creating socket\n",
958 __func__, task_pid_nr(current));
963 err = p9_bind_privport(csocket);
965 pr_err("%s (%d): problem binding to privport\n",
966 __func__, task_pid_nr(current));
967 sock_release(csocket);
972 err = csocket->ops->connect(csocket,
973 (struct sockaddr *)&sin_server,
974 sizeof(struct sockaddr_in), 0);
976 pr_err("%s (%d): problem connecting socket to %s\n",
977 __func__, task_pid_nr(current), addr);
978 sock_release(csocket);
982 return p9_socket_open(client, csocket);
986 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
989 struct socket *csocket;
990 struct sockaddr_un sun_server;
994 if (!addr || !strlen(addr))
997 if (strlen(addr) >= UNIX_PATH_MAX) {
998 pr_err("%s (%d): address too long: %s\n",
999 __func__, task_pid_nr(current), addr);
1000 return -ENAMETOOLONG;
1003 sun_server.sun_family = PF_UNIX;
1004 strcpy(sun_server.sun_path, addr);
1005 err = __sock_create(current->nsproxy->net_ns, PF_UNIX,
1006 SOCK_STREAM, 0, &csocket, 1);
1008 pr_err("%s (%d): problem creating socket\n",
1009 __func__, task_pid_nr(current));
1013 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1014 sizeof(struct sockaddr_un) - 1, 0);
1016 pr_err("%s (%d): problem connecting socket: %s: %d\n",
1017 __func__, task_pid_nr(current), addr, err);
1018 sock_release(csocket);
1022 return p9_socket_open(client, csocket);
1026 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1029 struct p9_fd_opts opts;
1031 parse_opts(args, &opts);
1033 if (opts.rfd == ~0 || opts.wfd == ~0) {
1034 pr_err("Insufficient options for proto=fd\n");
1035 return -ENOPROTOOPT;
1038 err = p9_fd_open(client, opts.rfd, opts.wfd);
1042 p9_conn_create(client);
1047 static struct p9_trans_module p9_tcp_trans = {
1049 .maxsize = MAX_SOCK_BUF,
1051 .create = p9_fd_create_tcp,
1052 .close = p9_fd_close,
1053 .request = p9_fd_request,
1054 .cancel = p9_fd_cancel,
1055 .cancelled = p9_fd_cancelled,
1056 .owner = THIS_MODULE,
1059 static struct p9_trans_module p9_unix_trans = {
1061 .maxsize = MAX_SOCK_BUF,
1063 .create = p9_fd_create_unix,
1064 .close = p9_fd_close,
1065 .request = p9_fd_request,
1066 .cancel = p9_fd_cancel,
1067 .cancelled = p9_fd_cancelled,
1068 .owner = THIS_MODULE,
1071 static struct p9_trans_module p9_fd_trans = {
1073 .maxsize = MAX_SOCK_BUF,
1075 .create = p9_fd_create,
1076 .close = p9_fd_close,
1077 .request = p9_fd_request,
1078 .cancel = p9_fd_cancel,
1079 .cancelled = p9_fd_cancelled,
1080 .owner = THIS_MODULE,
1084 * p9_poll_proc - poll worker thread
1085 * @a: thread state and arguments
1087 * polls all v9fs transports for new events and queues the appropriate
1088 * work to the work queue
1092 static void p9_poll_workfn(struct work_struct *work)
1094 unsigned long flags;
1096 p9_debug(P9_DEBUG_TRANS, "start %p\n", current);
1098 spin_lock_irqsave(&p9_poll_lock, flags);
1099 while (!list_empty(&p9_poll_pending_list)) {
1100 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1103 list_del_init(&conn->poll_pending_link);
1104 spin_unlock_irqrestore(&p9_poll_lock, flags);
1108 spin_lock_irqsave(&p9_poll_lock, flags);
1110 spin_unlock_irqrestore(&p9_poll_lock, flags);
1112 p9_debug(P9_DEBUG_TRANS, "finish\n");
1115 int p9_trans_fd_init(void)
1117 v9fs_register_trans(&p9_tcp_trans);
1118 v9fs_register_trans(&p9_unix_trans);
1119 v9fs_register_trans(&p9_fd_trans);
1124 void p9_trans_fd_exit(void)
1126 flush_work(&p9_poll_work);
1127 v9fs_unregister_trans(&p9_tcp_trans);
1128 v9fs_unregister_trans(&p9_unix_trans);
1129 v9fs_unregister_trans(&p9_fd_trans);