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 <linux/seq_file.h>
45 #include <net/9p/9p.h>
46 #include <net/9p/client.h>
47 #include <net/9p/transport.h>
49 #include <linux/syscalls.h> /* killme */
52 #define MAX_SOCK_BUF (64*1024)
53 #define MAXPOLLWADDR 2
55 static struct p9_trans_module p9_tcp_trans;
56 static struct p9_trans_module p9_fd_trans;
59 * struct p9_fd_opts - per-transport options
60 * @rfd: file descriptor for reading (trans=fd)
61 * @wfd: file descriptor for writing (trans=fd)
62 * @port: port to connect to (trans=tcp)
74 * Option Parsing (code inspired by NFS code)
75 * - a little lazy - parse all fd-transport options
79 /* Options that take integer arguments */
80 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
81 /* Options that take no arguments */
85 static const match_table_t tokens = {
86 {Opt_port, "port=%u"},
87 {Opt_rfdno, "rfdno=%u"},
88 {Opt_wfdno, "wfdno=%u"},
89 {Opt_privport, "privport"},
94 Rworksched = 1, /* read work scheduled or running */
95 Rpending = 2, /* can read */
96 Wworksched = 4, /* write work scheduled or running */
97 Wpending = 8, /* can write */
100 struct p9_poll_wait {
101 struct p9_conn *conn;
102 wait_queue_entry_t wait;
103 wait_queue_head_t *wait_addr;
107 * struct p9_conn - fd mux connection state information
108 * @mux_list: list link for mux to manage multiple connections (?)
109 * @client: reference to client instance for this connection
111 * @req_list: accounting for requests which have been sent
112 * @unsent_req_list: accounting for requests that haven't been sent
113 * @req: current request being processed (if any)
114 * @tmp_buf: temporary buffer to read in header
115 * @rc: temporary fcall for reading current frame
116 * @wpos: write position for current frame
117 * @wsize: amount of data to write for current frame
118 * @wbuf: current write buffer
119 * @poll_pending_link: pending links to be polled per conn
120 * @poll_wait: array of wait_q's for various worker threads
122 * @rq: current read work
123 * @wq: current write work
129 struct list_head mux_list;
130 struct p9_client *client;
132 struct list_head req_list;
133 struct list_head unsent_req_list;
134 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;
202 LIST_HEAD(cancel_list);
204 p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
206 spin_lock(&m->client->lock);
209 spin_unlock(&m->client->lock);
215 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
216 list_move(&req->req_list, &cancel_list);
217 req->status = REQ_STATUS_ERROR;
219 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
220 list_move(&req->req_list, &cancel_list);
221 req->status = REQ_STATUS_ERROR;
224 spin_unlock(&m->client->lock);
226 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
227 p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req);
228 list_del(&req->req_list);
231 p9_client_cb(m->client, req, REQ_STATUS_ERROR);
236 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
239 struct p9_trans_fd *ts = NULL;
241 if (client && client->status == Connected)
247 if (!ts->rd->f_op->poll)
250 if (!ts->wr->f_op->poll)
253 ret = ts->rd->f_op->poll(ts->rd, pt);
257 if (ts->rd != ts->wr) {
258 n = ts->wr->f_op->poll(ts->wr, pt);
261 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
268 * p9_fd_read- read from a fd
269 * @client: client instance
270 * @v: buffer to receive data into
271 * @len: size of receive buffer
275 static int p9_fd_read(struct p9_client *client, void *v, int len)
278 struct p9_trans_fd *ts = NULL;
281 if (client && client->status != Disconnected)
287 if (!(ts->rd->f_flags & O_NONBLOCK))
288 p9_debug(P9_DEBUG_ERROR, "blocking read ...\n");
291 ret = kernel_read(ts->rd, v, len, &pos);
292 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
293 client->status = Disconnected;
298 * p9_read_work - called when there is some data to be read from a transport
299 * @work: container of work to be done
303 static void p9_read_work(struct work_struct *work)
308 m = container_of(work, struct p9_conn, rq);
313 p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset);
316 m->rc.sdata = m->tmp_buf;
318 m->rc.capacity = 7; /* start by reading header */
321 clear_bit(Rpending, &m->wsched);
322 p9_debug(P9_DEBUG_TRANS, "read mux %p pos %zd size: %zd = %zd\n",
323 m, m->rc.offset, m->rc.capacity,
324 m->rc.capacity - m->rc.offset);
325 err = p9_fd_read(m->client, m->rc.sdata + m->rc.offset,
326 m->rc.capacity - m->rc.offset);
327 p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err);
337 if ((!m->req) && (m->rc.offset == m->rc.capacity)) {
338 p9_debug(P9_DEBUG_TRANS, "got new header\n");
340 err = p9_parse_header(&m->rc, NULL, NULL, NULL, 0);
342 p9_debug(P9_DEBUG_ERROR,
343 "error parsing header: %d\n", err);
347 if (m->rc.size >= m->client->msize) {
348 p9_debug(P9_DEBUG_ERROR,
349 "requested packet size too big: %d\n",
355 p9_debug(P9_DEBUG_TRANS,
356 "mux %p pkt: size: %d bytes tag: %d\n",
357 m, m->rc.size, m->rc.tag);
359 m->req = p9_tag_lookup(m->client, m->rc.tag);
360 if (!m->req || (m->req->status != REQ_STATUS_SENT)) {
361 p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
367 if (m->req->rc == NULL) {
368 p9_debug(P9_DEBUG_ERROR,
369 "No recv fcall for tag %d (req %p), disconnecting!\n",
375 m->rc.sdata = (char *)m->req->rc + sizeof(struct p9_fcall);
376 memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity);
377 m->rc.capacity = m->rc.size;
381 * not an else because some packets (like clunk) have no payload
383 if ((m->req) && (m->rc.offset == m->rc.capacity)) {
384 p9_debug(P9_DEBUG_TRANS, "got new packet\n");
385 spin_lock(&m->client->lock);
386 if (m->req->status == REQ_STATUS_SENT) {
387 list_del(&m->req->req_list);
388 p9_client_cb(m->client, m->req, REQ_STATUS_RCVD);
389 } else if (m->req->status == REQ_STATUS_FLSHD) {
390 /* Ignore replies associated with a cancelled request. */
391 p9_debug(P9_DEBUG_TRANS,
392 "Ignore replies associated with a cancelled request\n");
394 spin_unlock(&m->client->lock);
395 p9_debug(P9_DEBUG_ERROR,
396 "Request tag %d errored out while we were reading the reply\n",
401 spin_unlock(&m->client->lock);
409 clear_bit(Rworksched, &m->wsched);
411 if (!list_empty(&m->req_list)) {
412 if (test_and_clear_bit(Rpending, &m->wsched))
415 n = p9_fd_poll(m->client, NULL);
417 if ((n & POLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) {
418 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
419 schedule_work(&m->rq);
425 p9_conn_cancel(m, err);
426 clear_bit(Rworksched, &m->wsched);
430 * p9_fd_write - write to a socket
431 * @client: client instance
432 * @v: buffer to send data from
433 * @len: size of send buffer
437 static int p9_fd_write(struct p9_client *client, void *v, int len)
440 struct p9_trans_fd *ts = NULL;
442 if (client && client->status != Disconnected)
448 if (!(ts->wr->f_flags & O_NONBLOCK))
449 p9_debug(P9_DEBUG_ERROR, "blocking write ...\n");
451 ret = kernel_write(ts->wr, v, len, &ts->wr->f_pos);
452 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
453 client->status = Disconnected;
458 * p9_write_work - called when a transport can send some data
459 * @work: container for work to be done
463 static void p9_write_work(struct work_struct *work)
467 struct p9_req_t *req;
469 m = container_of(work, struct p9_conn, wq);
472 clear_bit(Wworksched, &m->wsched);
477 spin_lock(&m->client->lock);
478 if (list_empty(&m->unsent_req_list)) {
479 clear_bit(Wworksched, &m->wsched);
480 spin_unlock(&m->client->lock);
484 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
486 req->status = REQ_STATUS_SENT;
487 p9_debug(P9_DEBUG_TRANS, "move req %p\n", req);
488 list_move_tail(&req->req_list, &m->req_list);
490 m->wbuf = req->tc->sdata;
491 m->wsize = req->tc->size;
493 spin_unlock(&m->client->lock);
496 p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n",
497 m, m->wpos, m->wsize);
498 clear_bit(Wpending, &m->wsched);
499 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
500 p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);
513 if (m->wpos == m->wsize)
514 m->wpos = m->wsize = 0;
517 clear_bit(Wworksched, &m->wsched);
519 if (m->wsize || !list_empty(&m->unsent_req_list)) {
520 if (test_and_clear_bit(Wpending, &m->wsched))
523 n = p9_fd_poll(m->client, NULL);
526 !test_and_set_bit(Wworksched, &m->wsched)) {
527 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
528 schedule_work(&m->wq);
535 p9_conn_cancel(m, err);
536 clear_bit(Wworksched, &m->wsched);
539 static int p9_pollwake(wait_queue_entry_t *wait, unsigned int mode, int sync, void *key)
541 struct p9_poll_wait *pwait =
542 container_of(wait, struct p9_poll_wait, wait);
543 struct p9_conn *m = pwait->conn;
546 spin_lock_irqsave(&p9_poll_lock, flags);
547 if (list_empty(&m->poll_pending_link))
548 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
549 spin_unlock_irqrestore(&p9_poll_lock, flags);
551 schedule_work(&p9_poll_work);
556 * p9_pollwait - add poll task to the wait queue
557 * @filp: file pointer being polled
558 * @wait_address: wait_q to block on
561 * called by files poll operation to add v9fs-poll task to files wait queue
565 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
567 struct p9_conn *m = container_of(p, struct p9_conn, pt);
568 struct p9_poll_wait *pwait = NULL;
571 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
572 if (m->poll_wait[i].wait_addr == NULL) {
573 pwait = &m->poll_wait[i];
579 p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n");
584 pwait->wait_addr = wait_address;
585 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
586 add_wait_queue(wait_address, &pwait->wait);
590 * p9_conn_create - initialize the per-session mux data
591 * @client: client instance
593 * Note: Creates the polling task if this is the first session.
596 static void p9_conn_create(struct p9_client *client)
599 struct p9_trans_fd *ts = client->trans;
600 struct p9_conn *m = &ts->conn;
602 p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize);
604 INIT_LIST_HEAD(&m->mux_list);
607 INIT_LIST_HEAD(&m->req_list);
608 INIT_LIST_HEAD(&m->unsent_req_list);
609 INIT_WORK(&m->rq, p9_read_work);
610 INIT_WORK(&m->wq, p9_write_work);
611 INIT_LIST_HEAD(&m->poll_pending_link);
612 init_poll_funcptr(&m->pt, p9_pollwait);
614 n = p9_fd_poll(client, &m->pt);
616 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
617 set_bit(Rpending, &m->wsched);
621 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
622 set_bit(Wpending, &m->wsched);
627 * p9_poll_mux - polls a mux and schedules read or write works if necessary
628 * @m: connection to poll
632 static void p9_poll_mux(struct p9_conn *m)
639 n = p9_fd_poll(m->client, NULL);
640 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
641 p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);
644 p9_conn_cancel(m, n);
648 set_bit(Rpending, &m->wsched);
649 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
650 if (!test_and_set_bit(Rworksched, &m->wsched)) {
651 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
652 schedule_work(&m->rq);
657 set_bit(Wpending, &m->wsched);
658 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
659 if ((m->wsize || !list_empty(&m->unsent_req_list)) &&
660 !test_and_set_bit(Wworksched, &m->wsched)) {
661 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
662 schedule_work(&m->wq);
668 * p9_fd_request - send 9P request
669 * The function can sleep until the request is scheduled for sending.
670 * The function can be interrupted. Return from the function is not
671 * a guarantee that the request is sent successfully.
673 * @client: client instance
674 * @req: request to be sent
678 static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
681 struct p9_trans_fd *ts = client->trans;
682 struct p9_conn *m = &ts->conn;
684 p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n",
685 m, current, req->tc, req->tc->id);
689 spin_lock(&client->lock);
690 req->status = REQ_STATUS_UNSENT;
691 list_add_tail(&req->req_list, &m->unsent_req_list);
692 spin_unlock(&client->lock);
694 if (test_and_clear_bit(Wpending, &m->wsched))
697 n = p9_fd_poll(m->client, NULL);
699 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
700 schedule_work(&m->wq);
705 static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
709 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
711 spin_lock(&client->lock);
713 if (req->status == REQ_STATUS_UNSENT) {
714 list_del(&req->req_list);
715 req->status = REQ_STATUS_FLSHD;
718 spin_unlock(&client->lock);
723 static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req)
725 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
727 spin_lock(&client->lock);
728 /* Ignore cancelled request if message has been received
731 if (req->status == REQ_STATUS_RCVD) {
732 spin_unlock(&client->lock);
736 /* we haven't received a response for oldreq,
737 * remove it from the list.
739 list_del(&req->req_list);
740 req->status = REQ_STATUS_FLSHD;
741 spin_unlock(&client->lock);
746 static int p9_fd_show_options(struct seq_file *m, struct p9_client *clnt)
748 if (clnt->trans_mod == &p9_tcp_trans) {
749 if (clnt->trans_opts.tcp.port != P9_PORT)
750 seq_printf(m, ",port=%u", clnt->trans_opts.tcp.port);
751 } else if (clnt->trans_mod == &p9_fd_trans) {
752 if (clnt->trans_opts.fd.rfd != ~0)
753 seq_printf(m, ",rfd=%u", clnt->trans_opts.fd.rfd);
754 if (clnt->trans_opts.fd.wfd != ~0)
755 seq_printf(m, ",wfd=%u", clnt->trans_opts.fd.wfd);
761 * parse_opts - parse mount options into p9_fd_opts structure
762 * @params: options string passed from mount
763 * @opts: fd transport-specific structure to parse options into
765 * Returns 0 upon success, -ERRNO upon failure
768 static int parse_opts(char *params, struct p9_fd_opts *opts)
771 substring_t args[MAX_OPT_ARGS];
773 char *options, *tmp_options;
775 opts->port = P9_PORT;
778 opts->privport = false;
783 tmp_options = kstrdup(params, GFP_KERNEL);
785 p9_debug(P9_DEBUG_ERROR,
786 "failed to allocate copy of option string\n");
789 options = tmp_options;
791 while ((p = strsep(&options, ",")) != NULL) {
796 token = match_token(p, tokens, args);
797 if ((token != Opt_err) && (token != Opt_privport)) {
798 r = match_int(&args[0], &option);
800 p9_debug(P9_DEBUG_ERROR,
801 "integer field, but no integer?\n");
816 opts->privport = true;
827 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
829 struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd),
837 if (!(ts->rd->f_mode & FMODE_READ))
839 /* prevent workers from hanging on IO when fd is a pipe */
840 ts->rd->f_flags |= O_NONBLOCK;
844 if (!(ts->wr->f_mode & FMODE_WRITE))
846 ts->wr->f_flags |= O_NONBLOCK;
849 client->status = Connected;
862 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
864 struct p9_trans_fd *p;
867 p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL);
869 sock_release(csocket);
873 csocket->sk->sk_allocation = GFP_NOIO;
874 file = sock_alloc_file(csocket, 0, NULL);
876 pr_err("%s (%d): failed to map fd\n",
877 __func__, task_pid_nr(current));
878 sock_release(csocket);
880 return PTR_ERR(file);
884 p->wr = p->rd = file;
886 client->status = Connected;
888 p->rd->f_flags |= O_NONBLOCK;
890 p9_conn_create(client);
895 * p9_mux_destroy - cancels all pending requests of mux
900 static void p9_conn_destroy(struct p9_conn *m)
902 p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n",
903 m, m->mux_list.prev, m->mux_list.next);
906 cancel_work_sync(&m->rq);
907 cancel_work_sync(&m->wq);
909 p9_conn_cancel(m, -ECONNRESET);
915 * p9_fd_close - shutdown file descriptor transport
916 * @client: client instance
920 static void p9_fd_close(struct p9_client *client)
922 struct p9_trans_fd *ts;
931 client->status = Disconnected;
933 p9_conn_destroy(&ts->conn);
944 * stolen from NFS - maybe should be made a generic function?
946 static inline int valid_ipaddr4(const char *buf)
948 int rc, count, in[4];
950 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
953 for (count = 0; count < 4; count++) {
960 static int p9_bind_privport(struct socket *sock)
962 struct sockaddr_in cl;
963 int port, err = -EINVAL;
965 memset(&cl, 0, sizeof(cl));
966 cl.sin_family = AF_INET;
967 cl.sin_addr.s_addr = INADDR_ANY;
968 for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) {
969 cl.sin_port = htons((ushort)port);
970 err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl));
971 if (err != -EADDRINUSE)
979 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
982 struct socket *csocket;
983 struct sockaddr_in sin_server;
984 struct p9_fd_opts opts;
986 err = parse_opts(args, &opts);
990 if (addr == NULL || valid_ipaddr4(addr) < 0)
995 client->trans_opts.tcp.port = opts.port;
996 client->trans_opts.tcp.privport = opts.privport;
997 sin_server.sin_family = AF_INET;
998 sin_server.sin_addr.s_addr = in_aton(addr);
999 sin_server.sin_port = htons(opts.port);
1000 err = __sock_create(current->nsproxy->net_ns, PF_INET,
1001 SOCK_STREAM, IPPROTO_TCP, &csocket, 1);
1003 pr_err("%s (%d): problem creating socket\n",
1004 __func__, task_pid_nr(current));
1008 if (opts.privport) {
1009 err = p9_bind_privport(csocket);
1011 pr_err("%s (%d): problem binding to privport\n",
1012 __func__, task_pid_nr(current));
1013 sock_release(csocket);
1018 err = csocket->ops->connect(csocket,
1019 (struct sockaddr *)&sin_server,
1020 sizeof(struct sockaddr_in), 0);
1022 pr_err("%s (%d): problem connecting socket to %s\n",
1023 __func__, task_pid_nr(current), addr);
1024 sock_release(csocket);
1028 return p9_socket_open(client, csocket);
1032 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
1035 struct socket *csocket;
1036 struct sockaddr_un sun_server;
1040 if (!addr || !strlen(addr))
1043 if (strlen(addr) >= UNIX_PATH_MAX) {
1044 pr_err("%s (%d): address too long: %s\n",
1045 __func__, task_pid_nr(current), addr);
1046 return -ENAMETOOLONG;
1049 sun_server.sun_family = PF_UNIX;
1050 strcpy(sun_server.sun_path, addr);
1051 err = __sock_create(current->nsproxy->net_ns, PF_UNIX,
1052 SOCK_STREAM, 0, &csocket, 1);
1054 pr_err("%s (%d): problem creating socket\n",
1055 __func__, task_pid_nr(current));
1059 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1060 sizeof(struct sockaddr_un) - 1, 0);
1062 pr_err("%s (%d): problem connecting socket: %s: %d\n",
1063 __func__, task_pid_nr(current), addr, err);
1064 sock_release(csocket);
1068 return p9_socket_open(client, csocket);
1072 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1075 struct p9_fd_opts opts;
1077 parse_opts(args, &opts);
1078 client->trans_opts.fd.rfd = opts.rfd;
1079 client->trans_opts.fd.wfd = opts.wfd;
1081 if (opts.rfd == ~0 || opts.wfd == ~0) {
1082 pr_err("Insufficient options for proto=fd\n");
1083 return -ENOPROTOOPT;
1086 err = p9_fd_open(client, opts.rfd, opts.wfd);
1090 p9_conn_create(client);
1095 static struct p9_trans_module p9_tcp_trans = {
1097 .maxsize = MAX_SOCK_BUF,
1099 .create = p9_fd_create_tcp,
1100 .close = p9_fd_close,
1101 .request = p9_fd_request,
1102 .cancel = p9_fd_cancel,
1103 .cancelled = p9_fd_cancelled,
1104 .show_options = p9_fd_show_options,
1105 .owner = THIS_MODULE,
1108 static struct p9_trans_module p9_unix_trans = {
1110 .maxsize = MAX_SOCK_BUF,
1112 .create = p9_fd_create_unix,
1113 .close = p9_fd_close,
1114 .request = p9_fd_request,
1115 .cancel = p9_fd_cancel,
1116 .cancelled = p9_fd_cancelled,
1117 .show_options = p9_fd_show_options,
1118 .owner = THIS_MODULE,
1121 static struct p9_trans_module p9_fd_trans = {
1123 .maxsize = MAX_SOCK_BUF,
1125 .create = p9_fd_create,
1126 .close = p9_fd_close,
1127 .request = p9_fd_request,
1128 .cancel = p9_fd_cancel,
1129 .cancelled = p9_fd_cancelled,
1130 .show_options = p9_fd_show_options,
1131 .owner = THIS_MODULE,
1135 * p9_poll_proc - poll worker thread
1136 * @a: thread state and arguments
1138 * polls all v9fs transports for new events and queues the appropriate
1139 * work to the work queue
1143 static void p9_poll_workfn(struct work_struct *work)
1145 unsigned long flags;
1147 p9_debug(P9_DEBUG_TRANS, "start %p\n", current);
1149 spin_lock_irqsave(&p9_poll_lock, flags);
1150 while (!list_empty(&p9_poll_pending_list)) {
1151 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1154 list_del_init(&conn->poll_pending_link);
1155 spin_unlock_irqrestore(&p9_poll_lock, flags);
1159 spin_lock_irqsave(&p9_poll_lock, flags);
1161 spin_unlock_irqrestore(&p9_poll_lock, flags);
1163 p9_debug(P9_DEBUG_TRANS, "finish\n");
1166 int p9_trans_fd_init(void)
1168 v9fs_register_trans(&p9_tcp_trans);
1169 v9fs_register_trans(&p9_unix_trans);
1170 v9fs_register_trans(&p9_fd_trans);
1175 void p9_trans_fd_exit(void)
1177 flush_work(&p9_poll_work);
1178 v9fs_unregister_trans(&p9_tcp_trans);
1179 v9fs_unregister_trans(&p9_unix_trans);
1180 v9fs_unregister_trans(&p9_fd_trans);