1 // SPDX-License-Identifier: GPL-2.0-only
3 * Fd transport layer. Includes deprecated socket layer.
5 * Copyright (C) 2006 by Russ Cox <rsc@swtch.com>
6 * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
7 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
8 * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14 #include <linux/module.h>
15 #include <linux/net.h>
16 #include <linux/ipv6.h>
17 #include <linux/kthread.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
21 #include <linux/uaccess.h>
22 #include <linux/inet.h>
23 #include <linux/idr.h>
24 #include <linux/file.h>
25 #include <linux/parser.h>
26 #include <linux/slab.h>
27 #include <linux/seq_file.h>
28 #include <net/9p/9p.h>
29 #include <net/9p/client.h>
30 #include <net/9p/transport.h>
32 #include <linux/syscalls.h> /* killme */
35 #define MAX_SOCK_BUF (1024*1024)
36 #define MAXPOLLWADDR 2
38 static struct p9_trans_module p9_tcp_trans;
39 static struct p9_trans_module p9_fd_trans;
42 * struct p9_fd_opts - per-transport options
43 * @rfd: file descriptor for reading (trans=fd)
44 * @wfd: file descriptor for writing (trans=fd)
45 * @port: port to connect to (trans=tcp)
46 * @privport: port is privileged
57 * Option Parsing (code inspired by NFS code)
58 * - a little lazy - parse all fd-transport options
62 /* Options that take integer arguments */
63 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
64 /* Options that take no arguments */
68 static const match_table_t tokens = {
69 {Opt_port, "port=%u"},
70 {Opt_rfdno, "rfdno=%u"},
71 {Opt_wfdno, "wfdno=%u"},
72 {Opt_privport, "privport"},
77 Rworksched = 1, /* read work scheduled or running */
78 Rpending = 2, /* can read */
79 Wworksched = 4, /* write work scheduled or running */
80 Wpending = 8, /* can write */
85 wait_queue_entry_t wait;
86 wait_queue_head_t *wait_addr;
90 * struct p9_conn - fd mux connection state information
91 * @mux_list: list link for mux to manage multiple connections (?)
92 * @client: reference to client instance for this connection
94 * @req_list: accounting for requests which have been sent
95 * @unsent_req_list: accounting for requests that haven't been sent
97 * @wreq: write request
98 * @req: current request being processed (if any)
99 * @tmp_buf: temporary buffer to read in header
100 * @rc: temporary fcall for reading current frame
101 * @wpos: write position for current frame
102 * @wsize: amount of data to write for current frame
103 * @wbuf: current write buffer
104 * @poll_pending_link: pending links to be polled per conn
105 * @poll_wait: array of wait_q's for various worker threads
107 * @rq: current read work
108 * @wq: current write work
114 struct list_head mux_list;
115 struct p9_client *client;
117 struct list_head req_list;
118 struct list_head unsent_req_list;
119 struct p9_req_t *rreq;
120 struct p9_req_t *wreq;
126 struct list_head poll_pending_link;
127 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
129 struct work_struct rq;
130 struct work_struct wq;
131 unsigned long wsched;
135 * struct p9_trans_fd - transport state
136 * @rd: reference to file to read from
137 * @wr: reference of file to write to
138 * @conn: connection state reference
148 static void p9_poll_workfn(struct work_struct *work);
150 static DEFINE_SPINLOCK(p9_poll_lock);
151 static LIST_HEAD(p9_poll_pending_list);
152 static DECLARE_WORK(p9_poll_work, p9_poll_workfn);
154 static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT;
155 static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT;
157 static void p9_mux_poll_stop(struct p9_conn *m)
162 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
163 struct p9_poll_wait *pwait = &m->poll_wait[i];
165 if (pwait->wait_addr) {
166 remove_wait_queue(pwait->wait_addr, &pwait->wait);
167 pwait->wait_addr = NULL;
171 spin_lock_irqsave(&p9_poll_lock, flags);
172 list_del_init(&m->poll_pending_link);
173 spin_unlock_irqrestore(&p9_poll_lock, flags);
175 flush_work(&p9_poll_work);
179 * p9_conn_cancel - cancel all pending requests with error
185 static void p9_conn_cancel(struct p9_conn *m, int err)
187 struct p9_req_t *req, *rtmp;
188 LIST_HEAD(cancel_list);
190 p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
192 spin_lock(&m->client->lock);
195 spin_unlock(&m->client->lock);
201 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
202 list_move(&req->req_list, &cancel_list);
204 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
205 list_move(&req->req_list, &cancel_list);
208 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
209 p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req);
210 list_del(&req->req_list);
213 p9_client_cb(m->client, req, REQ_STATUS_ERROR);
215 spin_unlock(&m->client->lock);
219 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt, int *err)
222 struct p9_trans_fd *ts = NULL;
224 if (client && client->status == Connected)
233 ret = vfs_poll(ts->rd, pt);
234 if (ts->rd != ts->wr)
235 ret = (ret & ~EPOLLOUT) | (vfs_poll(ts->wr, pt) & ~EPOLLIN);
240 * p9_fd_read- read from a fd
241 * @client: client instance
242 * @v: buffer to receive data into
243 * @len: size of receive buffer
247 static int p9_fd_read(struct p9_client *client, void *v, int len)
250 struct p9_trans_fd *ts = NULL;
253 if (client && client->status != Disconnected)
259 if (!(ts->rd->f_flags & O_NONBLOCK))
260 p9_debug(P9_DEBUG_ERROR, "blocking read ...\n");
263 ret = kernel_read(ts->rd, v, len, &pos);
264 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
265 client->status = Disconnected;
270 * p9_read_work - called when there is some data to be read from a transport
271 * @work: container of work to be done
275 static void p9_read_work(struct work_struct *work)
281 m = container_of(work, struct p9_conn, rq);
286 p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset);
289 m->rc.sdata = m->tmp_buf;
291 m->rc.capacity = 7; /* start by reading header */
294 clear_bit(Rpending, &m->wsched);
295 p9_debug(P9_DEBUG_TRANS, "read mux %p pos %zd size: %zd = %zd\n",
296 m, m->rc.offset, m->rc.capacity,
297 m->rc.capacity - m->rc.offset);
298 err = p9_fd_read(m->client, m->rc.sdata + m->rc.offset,
299 m->rc.capacity - m->rc.offset);
300 p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err);
310 if ((!m->rreq) && (m->rc.offset == m->rc.capacity)) {
311 p9_debug(P9_DEBUG_TRANS, "got new header\n");
315 err = p9_parse_header(&m->rc, &m->rc.size, NULL, NULL, 0);
317 p9_debug(P9_DEBUG_ERROR,
318 "error parsing header: %d\n", err);
322 if (m->rc.size >= m->client->msize) {
323 p9_debug(P9_DEBUG_ERROR,
324 "requested packet size too big: %d\n",
330 p9_debug(P9_DEBUG_TRANS,
331 "mux %p pkt: size: %d bytes tag: %d\n",
332 m, m->rc.size, m->rc.tag);
334 m->rreq = p9_tag_lookup(m->client, m->rc.tag);
335 if (!m->rreq || (m->rreq->status != REQ_STATUS_SENT)) {
336 p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
342 if (!m->rreq->rc.sdata) {
343 p9_debug(P9_DEBUG_ERROR,
344 "No recv fcall for tag %d (req %p), disconnecting!\n",
346 p9_req_put(m->client, m->rreq);
351 m->rc.sdata = m->rreq->rc.sdata;
352 memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity);
353 m->rc.capacity = m->rc.size;
357 * not an else because some packets (like clunk) have no payload
359 if ((m->rreq) && (m->rc.offset == m->rc.capacity)) {
360 p9_debug(P9_DEBUG_TRANS, "got new packet\n");
361 m->rreq->rc.size = m->rc.offset;
362 spin_lock(&m->client->lock);
363 if (m->rreq->status == REQ_STATUS_SENT) {
364 list_del(&m->rreq->req_list);
365 p9_client_cb(m->client, m->rreq, REQ_STATUS_RCVD);
366 } else if (m->rreq->status == REQ_STATUS_FLSHD) {
367 /* Ignore replies associated with a cancelled request. */
368 p9_debug(P9_DEBUG_TRANS,
369 "Ignore replies associated with a cancelled request\n");
371 spin_unlock(&m->client->lock);
372 p9_debug(P9_DEBUG_ERROR,
373 "Request tag %d errored out while we were reading the reply\n",
378 spin_unlock(&m->client->lock);
382 p9_req_put(m->client, m->rreq);
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, NULL);
395 if ((n & EPOLLIN) && !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)
418 struct p9_trans_fd *ts = NULL;
420 if (client && client->status != Disconnected)
426 if (!(ts->wr->f_flags & O_NONBLOCK))
427 p9_debug(P9_DEBUG_ERROR, "blocking write ...\n");
429 ret = kernel_write(ts->wr, v, len, &ts->wr->f_pos);
430 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
431 client->status = Disconnected;
436 * p9_write_work - called when a transport can send some data
437 * @work: container for work to be done
441 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 spin_lock(&m->client->lock);
457 if (list_empty(&m->unsent_req_list)) {
458 clear_bit(Wworksched, &m->wsched);
459 spin_unlock(&m->client->lock);
463 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
465 req->status = REQ_STATUS_SENT;
466 p9_debug(P9_DEBUG_TRANS, "move req %p\n", req);
467 list_move_tail(&req->req_list, &m->req_list);
469 m->wbuf = req->tc.sdata;
470 m->wsize = req->tc.size;
474 spin_unlock(&m->client->lock);
477 p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n",
478 m, m->wpos, m->wsize);
479 clear_bit(Wpending, &m->wsched);
480 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
481 p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);
494 if (m->wpos == m->wsize) {
495 m->wpos = m->wsize = 0;
496 p9_req_put(m->client, m->wreq);
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, NULL);
509 if ((n & EPOLLOUT) &&
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_entry_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, NULL);
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)
619 int err = -ECONNRESET;
624 n = p9_fd_poll(m->client, NULL, &err);
625 if (n & (EPOLLERR | EPOLLHUP | EPOLLNVAL)) {
626 p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);
627 p9_conn_cancel(m, err);
631 set_bit(Rpending, &m->wsched);
632 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
633 if (!test_and_set_bit(Rworksched, &m->wsched)) {
634 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
635 schedule_work(&m->rq);
640 set_bit(Wpending, &m->wsched);
641 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
642 if ((m->wsize || !list_empty(&m->unsent_req_list)) &&
643 !test_and_set_bit(Wworksched, &m->wsched)) {
644 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
645 schedule_work(&m->wq);
651 * p9_fd_request - send 9P request
652 * The function can sleep until the request is scheduled for sending.
653 * The function can be interrupted. Return from the function is not
654 * a guarantee that the request is sent successfully.
656 * @client: client instance
657 * @req: request to be sent
661 static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
664 struct p9_trans_fd *ts = client->trans;
665 struct p9_conn *m = &ts->conn;
667 p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n",
668 m, current, &req->tc, req->tc.id);
672 spin_lock(&client->lock);
673 req->status = REQ_STATUS_UNSENT;
674 list_add_tail(&req->req_list, &m->unsent_req_list);
675 spin_unlock(&client->lock);
677 if (test_and_clear_bit(Wpending, &m->wsched))
680 n = p9_fd_poll(m->client, NULL, NULL);
682 if (n & EPOLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
683 schedule_work(&m->wq);
688 static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
692 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
694 spin_lock(&client->lock);
696 if (req->status == REQ_STATUS_UNSENT) {
697 list_del(&req->req_list);
698 req->status = REQ_STATUS_FLSHD;
699 p9_req_put(client, req);
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 spin_lock(&client->lock);
712 /* Ignore cancelled request if message has been received
715 if (req->status == REQ_STATUS_RCVD) {
716 spin_unlock(&client->lock);
720 /* we haven't received a response for oldreq,
721 * remove it from the list.
723 list_del(&req->req_list);
724 req->status = REQ_STATUS_FLSHD;
725 spin_unlock(&client->lock);
726 p9_req_put(client, req);
731 static int p9_fd_show_options(struct seq_file *m, struct p9_client *clnt)
733 if (clnt->trans_mod == &p9_tcp_trans) {
734 if (clnt->trans_opts.tcp.port != P9_PORT)
735 seq_printf(m, ",port=%u", clnt->trans_opts.tcp.port);
736 } else if (clnt->trans_mod == &p9_fd_trans) {
737 if (clnt->trans_opts.fd.rfd != ~0)
738 seq_printf(m, ",rfd=%u", clnt->trans_opts.fd.rfd);
739 if (clnt->trans_opts.fd.wfd != ~0)
740 seq_printf(m, ",wfd=%u", clnt->trans_opts.fd.wfd);
746 * parse_opts - parse mount options into p9_fd_opts structure
747 * @params: options string passed from mount
748 * @opts: fd transport-specific structure to parse options into
750 * Returns 0 upon success, -ERRNO upon failure
753 static int parse_opts(char *params, struct p9_fd_opts *opts)
756 substring_t args[MAX_OPT_ARGS];
758 char *options, *tmp_options;
760 opts->port = P9_PORT;
763 opts->privport = false;
768 tmp_options = kstrdup(params, GFP_KERNEL);
770 p9_debug(P9_DEBUG_ERROR,
771 "failed to allocate copy of option string\n");
774 options = tmp_options;
776 while ((p = strsep(&options, ",")) != NULL) {
781 token = match_token(p, tokens, args);
782 if ((token != Opt_err) && (token != Opt_privport)) {
783 r = match_int(&args[0], &option);
785 p9_debug(P9_DEBUG_ERROR,
786 "integer field, but no integer?\n");
801 opts->privport = true;
812 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
814 struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd),
822 if (!(ts->rd->f_mode & FMODE_READ))
827 if (!(ts->wr->f_mode & FMODE_WRITE))
831 client->status = Connected;
844 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
846 struct p9_trans_fd *p;
849 p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL);
853 csocket->sk->sk_allocation = GFP_NOIO;
854 file = sock_alloc_file(csocket, 0, NULL);
856 pr_err("%s (%d): failed to map fd\n",
857 __func__, task_pid_nr(current));
859 return PTR_ERR(file);
863 p->wr = p->rd = file;
865 client->status = Connected;
867 p->rd->f_flags |= O_NONBLOCK;
869 p9_conn_create(client);
874 * p9_conn_destroy - cancels all pending requests of mux
879 static void p9_conn_destroy(struct p9_conn *m)
881 p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n",
882 m, m->mux_list.prev, m->mux_list.next);
885 cancel_work_sync(&m->rq);
887 p9_req_put(m->client, m->rreq);
890 cancel_work_sync(&m->wq);
892 p9_req_put(m->client, m->wreq);
896 p9_conn_cancel(m, -ECONNRESET);
902 * p9_fd_close - shutdown file descriptor transport
903 * @client: client instance
907 static void p9_fd_close(struct p9_client *client)
909 struct p9_trans_fd *ts;
918 client->status = Disconnected;
920 p9_conn_destroy(&ts->conn);
931 * stolen from NFS - maybe should be made a generic function?
933 static inline int valid_ipaddr4(const char *buf)
935 int rc, count, in[4];
937 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
940 for (count = 0; count < 4; count++) {
947 static int p9_bind_privport(struct socket *sock)
949 struct sockaddr_in cl;
950 int port, err = -EINVAL;
952 memset(&cl, 0, sizeof(cl));
953 cl.sin_family = AF_INET;
954 cl.sin_addr.s_addr = htonl(INADDR_ANY);
955 for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) {
956 cl.sin_port = htons((ushort)port);
957 err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl));
958 if (err != -EADDRINUSE)
966 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
969 struct socket *csocket;
970 struct sockaddr_in sin_server;
971 struct p9_fd_opts opts;
973 err = parse_opts(args, &opts);
977 if (addr == NULL || valid_ipaddr4(addr) < 0)
982 client->trans_opts.tcp.port = opts.port;
983 client->trans_opts.tcp.privport = opts.privport;
984 sin_server.sin_family = AF_INET;
985 sin_server.sin_addr.s_addr = in_aton(addr);
986 sin_server.sin_port = htons(opts.port);
987 err = __sock_create(current->nsproxy->net_ns, PF_INET,
988 SOCK_STREAM, IPPROTO_TCP, &csocket, 1);
990 pr_err("%s (%d): problem creating socket\n",
991 __func__, task_pid_nr(current));
996 err = p9_bind_privport(csocket);
998 pr_err("%s (%d): problem binding to privport\n",
999 __func__, task_pid_nr(current));
1000 sock_release(csocket);
1005 err = csocket->ops->connect(csocket,
1006 (struct sockaddr *)&sin_server,
1007 sizeof(struct sockaddr_in), 0);
1009 pr_err("%s (%d): problem connecting socket to %s\n",
1010 __func__, task_pid_nr(current), addr);
1011 sock_release(csocket);
1015 return p9_socket_open(client, csocket);
1019 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
1022 struct socket *csocket;
1023 struct sockaddr_un sun_server;
1027 if (!addr || !strlen(addr))
1030 if (strlen(addr) >= UNIX_PATH_MAX) {
1031 pr_err("%s (%d): address too long: %s\n",
1032 __func__, task_pid_nr(current), addr);
1033 return -ENAMETOOLONG;
1036 sun_server.sun_family = PF_UNIX;
1037 strcpy(sun_server.sun_path, addr);
1038 err = __sock_create(current->nsproxy->net_ns, PF_UNIX,
1039 SOCK_STREAM, 0, &csocket, 1);
1041 pr_err("%s (%d): problem creating socket\n",
1042 __func__, task_pid_nr(current));
1046 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1047 sizeof(struct sockaddr_un) - 1, 0);
1049 pr_err("%s (%d): problem connecting socket: %s: %d\n",
1050 __func__, task_pid_nr(current), addr, err);
1051 sock_release(csocket);
1055 return p9_socket_open(client, csocket);
1059 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1062 struct p9_fd_opts opts;
1064 parse_opts(args, &opts);
1065 client->trans_opts.fd.rfd = opts.rfd;
1066 client->trans_opts.fd.wfd = opts.wfd;
1068 if (opts.rfd == ~0 || opts.wfd == ~0) {
1069 pr_err("Insufficient options for proto=fd\n");
1070 return -ENOPROTOOPT;
1073 err = p9_fd_open(client, opts.rfd, opts.wfd);
1077 p9_conn_create(client);
1082 static struct p9_trans_module p9_tcp_trans = {
1084 .maxsize = MAX_SOCK_BUF,
1086 .create = p9_fd_create_tcp,
1087 .close = p9_fd_close,
1088 .request = p9_fd_request,
1089 .cancel = p9_fd_cancel,
1090 .cancelled = p9_fd_cancelled,
1091 .show_options = p9_fd_show_options,
1092 .owner = THIS_MODULE,
1094 MODULE_ALIAS_9P("tcp");
1096 static struct p9_trans_module p9_unix_trans = {
1098 .maxsize = MAX_SOCK_BUF,
1100 .create = p9_fd_create_unix,
1101 .close = p9_fd_close,
1102 .request = p9_fd_request,
1103 .cancel = p9_fd_cancel,
1104 .cancelled = p9_fd_cancelled,
1105 .show_options = p9_fd_show_options,
1106 .owner = THIS_MODULE,
1108 MODULE_ALIAS_9P("unix");
1110 static struct p9_trans_module p9_fd_trans = {
1112 .maxsize = MAX_SOCK_BUF,
1114 .create = p9_fd_create,
1115 .close = p9_fd_close,
1116 .request = p9_fd_request,
1117 .cancel = p9_fd_cancel,
1118 .cancelled = p9_fd_cancelled,
1119 .show_options = p9_fd_show_options,
1120 .owner = THIS_MODULE,
1122 MODULE_ALIAS_9P("fd");
1125 * p9_poll_workfn - poll worker thread
1128 * polls all v9fs transports for new events and queues the appropriate
1129 * work to the work queue
1133 static void p9_poll_workfn(struct work_struct *work)
1135 unsigned long flags;
1137 p9_debug(P9_DEBUG_TRANS, "start %p\n", current);
1139 spin_lock_irqsave(&p9_poll_lock, flags);
1140 while (!list_empty(&p9_poll_pending_list)) {
1141 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1144 list_del_init(&conn->poll_pending_link);
1145 spin_unlock_irqrestore(&p9_poll_lock, flags);
1149 spin_lock_irqsave(&p9_poll_lock, flags);
1151 spin_unlock_irqrestore(&p9_poll_lock, flags);
1153 p9_debug(P9_DEBUG_TRANS, "finish\n");
1156 static int __init p9_trans_fd_init(void)
1158 v9fs_register_trans(&p9_tcp_trans);
1159 v9fs_register_trans(&p9_unix_trans);
1160 v9fs_register_trans(&p9_fd_trans);
1165 static void __exit p9_trans_fd_exit(void)
1167 flush_work(&p9_poll_work);
1168 v9fs_unregister_trans(&p9_tcp_trans);
1169 v9fs_unregister_trans(&p9_unix_trans);
1170 v9fs_unregister_trans(&p9_fd_trans);
1173 module_init(p9_trans_fd_init);
1174 module_exit(p9_trans_fd_exit);
1176 MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
1177 MODULE_DESCRIPTION("Filedescriptor Transport for 9P");
1178 MODULE_LICENSE("GPL");