1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/fs/9p/trans_fd.c
5 * Fd transport layer. Includes deprecated socket layer.
7 * Copyright (C) 2006 by Russ Cox <rsc@swtch.com>
8 * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
9 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
10 * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16 #include <linux/module.h>
17 #include <linux/net.h>
18 #include <linux/ipv6.h>
19 #include <linux/kthread.h>
20 #include <linux/errno.h>
21 #include <linux/kernel.h>
23 #include <linux/uaccess.h>
24 #include <linux/inet.h>
25 #include <linux/idr.h>
26 #include <linux/file.h>
27 #include <linux/parser.h>
28 #include <linux/slab.h>
29 #include <linux/seq_file.h>
30 #include <net/9p/9p.h>
31 #include <net/9p/client.h>
32 #include <net/9p/transport.h>
34 #include <linux/syscalls.h> /* killme */
37 #define MAX_SOCK_BUF (64*1024)
38 #define MAXPOLLWADDR 2
40 static struct p9_trans_module p9_tcp_trans;
41 static struct p9_trans_module p9_fd_trans;
44 * struct p9_fd_opts - per-transport options
45 * @rfd: file descriptor for reading (trans=fd)
46 * @wfd: file descriptor for writing (trans=fd)
47 * @port: port to connect to (trans=tcp)
48 * @privport: port is privileged
59 * Option Parsing (code inspired by NFS code)
60 * - a little lazy - parse all fd-transport options
64 /* Options that take integer arguments */
65 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
66 /* Options that take no arguments */
70 static const match_table_t tokens = {
71 {Opt_port, "port=%u"},
72 {Opt_rfdno, "rfdno=%u"},
73 {Opt_wfdno, "wfdno=%u"},
74 {Opt_privport, "privport"},
79 Rworksched = 1, /* read work scheduled or running */
80 Rpending = 2, /* can read */
81 Wworksched = 4, /* write work scheduled or running */
82 Wpending = 8, /* can write */
87 wait_queue_entry_t wait;
88 wait_queue_head_t *wait_addr;
92 * struct p9_conn - fd mux connection state information
93 * @mux_list: list link for mux to manage multiple connections (?)
94 * @client: reference to client instance for this connection
96 * @req_list: accounting for requests which have been sent
97 * @unsent_req_list: accounting for requests that haven't been sent
99 * @wreq: write request
100 * @req: current request being processed (if any)
101 * @tmp_buf: temporary buffer to read in header
102 * @rc: temporary fcall for reading current frame
103 * @wpos: write position for current frame
104 * @wsize: amount of data to write for current frame
105 * @wbuf: current write buffer
106 * @poll_pending_link: pending links to be polled per conn
107 * @poll_wait: array of wait_q's for various worker threads
109 * @rq: current read work
110 * @wq: current write work
116 struct list_head mux_list;
117 struct p9_client *client;
119 struct list_head req_list;
120 struct list_head unsent_req_list;
121 struct p9_req_t *rreq;
122 struct p9_req_t *wreq;
128 struct list_head poll_pending_link;
129 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
131 struct work_struct rq;
132 struct work_struct wq;
133 unsigned long wsched;
137 * struct p9_trans_fd - transport state
138 * @rd: reference to file to read from
139 * @wr: reference of file to write to
140 * @conn: connection state reference
150 static void p9_poll_workfn(struct work_struct *work);
152 static DEFINE_SPINLOCK(p9_poll_lock);
153 static LIST_HEAD(p9_poll_pending_list);
154 static DECLARE_WORK(p9_poll_work, p9_poll_workfn);
156 static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT;
157 static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT;
159 static void p9_mux_poll_stop(struct p9_conn *m)
164 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
165 struct p9_poll_wait *pwait = &m->poll_wait[i];
167 if (pwait->wait_addr) {
168 remove_wait_queue(pwait->wait_addr, &pwait->wait);
169 pwait->wait_addr = NULL;
173 spin_lock_irqsave(&p9_poll_lock, flags);
174 list_del_init(&m->poll_pending_link);
175 spin_unlock_irqrestore(&p9_poll_lock, flags);
177 flush_work(&p9_poll_work);
181 * p9_conn_cancel - cancel all pending requests with error
187 static void p9_conn_cancel(struct p9_conn *m, int err)
189 struct p9_req_t *req, *rtmp;
190 LIST_HEAD(cancel_list);
192 p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
194 spin_lock(&m->client->lock);
197 spin_unlock(&m->client->lock);
203 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
204 list_move(&req->req_list, &cancel_list);
206 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
207 list_move(&req->req_list, &cancel_list);
210 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
211 p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req);
212 list_del(&req->req_list);
215 p9_client_cb(m->client, req, REQ_STATUS_ERROR);
217 spin_unlock(&m->client->lock);
221 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt, int *err)
224 struct p9_trans_fd *ts = NULL;
226 if (client && client->status == Connected)
235 ret = vfs_poll(ts->rd, pt);
236 if (ts->rd != ts->wr)
237 ret = (ret & ~EPOLLOUT) | (vfs_poll(ts->wr, pt) & ~EPOLLIN);
242 * p9_fd_read- read from a fd
243 * @client: client instance
244 * @v: buffer to receive data into
245 * @len: size of receive buffer
249 static int p9_fd_read(struct p9_client *client, void *v, int len)
252 struct p9_trans_fd *ts = NULL;
255 if (client && client->status != Disconnected)
261 if (!(ts->rd->f_flags & O_NONBLOCK))
262 p9_debug(P9_DEBUG_ERROR, "blocking read ...\n");
265 ret = kernel_read(ts->rd, v, len, &pos);
266 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
267 client->status = Disconnected;
272 * p9_read_work - called when there is some data to be read from a transport
273 * @work: container of work to be done
277 static void p9_read_work(struct work_struct *work)
283 m = container_of(work, struct p9_conn, rq);
288 p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset);
291 m->rc.sdata = m->tmp_buf;
293 m->rc.capacity = 7; /* start by reading header */
296 clear_bit(Rpending, &m->wsched);
297 p9_debug(P9_DEBUG_TRANS, "read mux %p pos %zd size: %zd = %zd\n",
298 m, m->rc.offset, m->rc.capacity,
299 m->rc.capacity - m->rc.offset);
300 err = p9_fd_read(m->client, m->rc.sdata + m->rc.offset,
301 m->rc.capacity - m->rc.offset);
302 p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err);
312 if ((!m->rreq) && (m->rc.offset == m->rc.capacity)) {
313 p9_debug(P9_DEBUG_TRANS, "got new header\n");
317 err = p9_parse_header(&m->rc, &m->rc.size, NULL, NULL, 0);
319 p9_debug(P9_DEBUG_ERROR,
320 "error parsing header: %d\n", err);
324 if (m->rc.size >= m->client->msize) {
325 p9_debug(P9_DEBUG_ERROR,
326 "requested packet size too big: %d\n",
332 p9_debug(P9_DEBUG_TRANS,
333 "mux %p pkt: size: %d bytes tag: %d\n",
334 m, m->rc.size, m->rc.tag);
336 m->rreq = p9_tag_lookup(m->client, m->rc.tag);
337 if (!m->rreq || (m->rreq->status != REQ_STATUS_SENT)) {
338 p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
344 if (!m->rreq->rc.sdata) {
345 p9_debug(P9_DEBUG_ERROR,
346 "No recv fcall for tag %d (req %p), disconnecting!\n",
352 m->rc.sdata = m->rreq->rc.sdata;
353 memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity);
354 m->rc.capacity = m->rc.size;
358 * not an else because some packets (like clunk) have no payload
360 if ((m->rreq) && (m->rc.offset == m->rc.capacity)) {
361 p9_debug(P9_DEBUG_TRANS, "got new packet\n");
362 m->rreq->rc.size = m->rc.offset;
363 spin_lock(&m->client->lock);
364 if (m->rreq->status == REQ_STATUS_SENT) {
365 list_del(&m->rreq->req_list);
366 p9_client_cb(m->client, m->rreq, REQ_STATUS_RCVD);
367 } else if (m->rreq->status == REQ_STATUS_FLSHD) {
368 /* Ignore replies associated with a cancelled request. */
369 p9_debug(P9_DEBUG_TRANS,
370 "Ignore replies associated with a cancelled request\n");
372 spin_unlock(&m->client->lock);
373 p9_debug(P9_DEBUG_ERROR,
374 "Request tag %d errored out while we were reading the reply\n",
379 spin_unlock(&m->client->lock);
388 clear_bit(Rworksched, &m->wsched);
390 if (!list_empty(&m->req_list)) {
391 if (test_and_clear_bit(Rpending, &m->wsched))
394 n = p9_fd_poll(m->client, NULL, NULL);
396 if ((n & EPOLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) {
397 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
398 schedule_work(&m->rq);
404 p9_conn_cancel(m, err);
405 clear_bit(Rworksched, &m->wsched);
409 * p9_fd_write - write to a socket
410 * @client: client instance
411 * @v: buffer to send data from
412 * @len: size of send buffer
416 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");
430 ret = kernel_write(ts->wr, 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)
447 struct p9_req_t *req;
449 m = container_of(work, struct p9_conn, wq);
452 clear_bit(Wworksched, &m->wsched);
457 spin_lock(&m->client->lock);
458 if (list_empty(&m->unsent_req_list)) {
459 clear_bit(Wworksched, &m->wsched);
460 spin_unlock(&m->client->lock);
464 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
466 req->status = REQ_STATUS_SENT;
467 p9_debug(P9_DEBUG_TRANS, "move req %p\n", req);
468 list_move_tail(&req->req_list, &m->req_list);
470 m->wbuf = req->tc.sdata;
471 m->wsize = req->tc.size;
475 spin_unlock(&m->client->lock);
478 p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n",
479 m, m->wpos, m->wsize);
480 clear_bit(Wpending, &m->wsched);
481 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
482 p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);
495 if (m->wpos == m->wsize) {
496 m->wpos = m->wsize = 0;
502 clear_bit(Wworksched, &m->wsched);
504 if (m->wsize || !list_empty(&m->unsent_req_list)) {
505 if (test_and_clear_bit(Wpending, &m->wsched))
508 n = p9_fd_poll(m->client, NULL, NULL);
510 if ((n & EPOLLOUT) &&
511 !test_and_set_bit(Wworksched, &m->wsched)) {
512 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
513 schedule_work(&m->wq);
520 p9_conn_cancel(m, err);
521 clear_bit(Wworksched, &m->wsched);
524 static int p9_pollwake(wait_queue_entry_t *wait, unsigned int mode, int sync, void *key)
526 struct p9_poll_wait *pwait =
527 container_of(wait, struct p9_poll_wait, wait);
528 struct p9_conn *m = pwait->conn;
531 spin_lock_irqsave(&p9_poll_lock, flags);
532 if (list_empty(&m->poll_pending_link))
533 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
534 spin_unlock_irqrestore(&p9_poll_lock, flags);
536 schedule_work(&p9_poll_work);
541 * p9_pollwait - add poll task to the wait queue
542 * @filp: file pointer being polled
543 * @wait_address: wait_q to block on
546 * called by files poll operation to add v9fs-poll task to files wait queue
550 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
552 struct p9_conn *m = container_of(p, struct p9_conn, pt);
553 struct p9_poll_wait *pwait = NULL;
556 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
557 if (m->poll_wait[i].wait_addr == NULL) {
558 pwait = &m->poll_wait[i];
564 p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n");
569 pwait->wait_addr = wait_address;
570 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
571 add_wait_queue(wait_address, &pwait->wait);
575 * p9_conn_create - initialize the per-session mux data
576 * @client: client instance
578 * Note: Creates the polling task if this is the first session.
581 static void p9_conn_create(struct p9_client *client)
584 struct p9_trans_fd *ts = client->trans;
585 struct p9_conn *m = &ts->conn;
587 p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize);
589 INIT_LIST_HEAD(&m->mux_list);
592 INIT_LIST_HEAD(&m->req_list);
593 INIT_LIST_HEAD(&m->unsent_req_list);
594 INIT_WORK(&m->rq, p9_read_work);
595 INIT_WORK(&m->wq, p9_write_work);
596 INIT_LIST_HEAD(&m->poll_pending_link);
597 init_poll_funcptr(&m->pt, p9_pollwait);
599 n = p9_fd_poll(client, &m->pt, NULL);
601 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
602 set_bit(Rpending, &m->wsched);
606 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
607 set_bit(Wpending, &m->wsched);
612 * p9_poll_mux - polls a mux and schedules read or write works if necessary
613 * @m: connection to poll
617 static void p9_poll_mux(struct p9_conn *m)
620 int err = -ECONNRESET;
625 n = p9_fd_poll(m->client, NULL, &err);
626 if (n & (EPOLLERR | EPOLLHUP | EPOLLNVAL)) {
627 p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);
628 p9_conn_cancel(m, err);
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, NULL);
683 if (n & EPOLLOUT && !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;
703 spin_unlock(&client->lock);
708 static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req)
710 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
712 spin_lock(&client->lock);
713 /* Ignore cancelled request if message has been received
716 if (req->status == REQ_STATUS_RCVD) {
717 spin_unlock(&client->lock);
721 /* we haven't received a response for oldreq,
722 * remove it from the list.
724 list_del(&req->req_list);
725 req->status = REQ_STATUS_FLSHD;
726 spin_unlock(&client->lock);
732 static int p9_fd_show_options(struct seq_file *m, struct p9_client *clnt)
734 if (clnt->trans_mod == &p9_tcp_trans) {
735 if (clnt->trans_opts.tcp.port != P9_PORT)
736 seq_printf(m, ",port=%u", clnt->trans_opts.tcp.port);
737 } else if (clnt->trans_mod == &p9_fd_trans) {
738 if (clnt->trans_opts.fd.rfd != ~0)
739 seq_printf(m, ",rfd=%u", clnt->trans_opts.fd.rfd);
740 if (clnt->trans_opts.fd.wfd != ~0)
741 seq_printf(m, ",wfd=%u", clnt->trans_opts.fd.wfd);
747 * parse_opts - parse mount options into p9_fd_opts structure
748 * @params: options string passed from mount
749 * @opts: fd transport-specific structure to parse options into
751 * Returns 0 upon success, -ERRNO upon failure
754 static int parse_opts(char *params, struct p9_fd_opts *opts)
757 substring_t args[MAX_OPT_ARGS];
759 char *options, *tmp_options;
761 opts->port = P9_PORT;
764 opts->privport = false;
769 tmp_options = kstrdup(params, GFP_KERNEL);
771 p9_debug(P9_DEBUG_ERROR,
772 "failed to allocate copy of option string\n");
775 options = tmp_options;
777 while ((p = strsep(&options, ",")) != NULL) {
782 token = match_token(p, tokens, args);
783 if ((token != Opt_err) && (token != Opt_privport)) {
784 r = match_int(&args[0], &option);
786 p9_debug(P9_DEBUG_ERROR,
787 "integer field, but no integer?\n");
802 opts->privport = true;
813 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
815 struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd),
823 if (!(ts->rd->f_mode & FMODE_READ))
828 if (!(ts->wr->f_mode & FMODE_WRITE))
832 client->status = Connected;
845 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
847 struct p9_trans_fd *p;
850 p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL);
854 csocket->sk->sk_allocation = GFP_NOIO;
855 file = sock_alloc_file(csocket, 0, NULL);
857 pr_err("%s (%d): failed to map fd\n",
858 __func__, task_pid_nr(current));
860 return PTR_ERR(file);
864 p->wr = p->rd = file;
866 client->status = Connected;
868 p->rd->f_flags |= O_NONBLOCK;
870 p9_conn_create(client);
875 * p9_conn_destroy - cancels all pending requests of mux
880 static void p9_conn_destroy(struct p9_conn *m)
882 p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n",
883 m, m->mux_list.prev, m->mux_list.next);
886 cancel_work_sync(&m->rq);
891 cancel_work_sync(&m->wq);
897 p9_conn_cancel(m, -ECONNRESET);
903 * p9_fd_close - shutdown file descriptor transport
904 * @client: client instance
908 static void p9_fd_close(struct p9_client *client)
910 struct p9_trans_fd *ts;
919 client->status = Disconnected;
921 p9_conn_destroy(&ts->conn);
932 * stolen from NFS - maybe should be made a generic function?
934 static inline int valid_ipaddr4(const char *buf)
936 int rc, count, in[4];
938 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
941 for (count = 0; count < 4; count++) {
948 static int p9_bind_privport(struct socket *sock)
950 struct sockaddr_in cl;
951 int port, err = -EINVAL;
953 memset(&cl, 0, sizeof(cl));
954 cl.sin_family = AF_INET;
955 cl.sin_addr.s_addr = htonl(INADDR_ANY);
956 for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) {
957 cl.sin_port = htons((ushort)port);
958 err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl));
959 if (err != -EADDRINUSE)
967 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
970 struct socket *csocket;
971 struct sockaddr_in sin_server;
972 struct p9_fd_opts opts;
974 err = parse_opts(args, &opts);
978 if (addr == NULL || valid_ipaddr4(addr) < 0)
983 client->trans_opts.tcp.port = opts.port;
984 client->trans_opts.tcp.privport = opts.privport;
985 sin_server.sin_family = AF_INET;
986 sin_server.sin_addr.s_addr = in_aton(addr);
987 sin_server.sin_port = htons(opts.port);
988 err = __sock_create(current->nsproxy->net_ns, PF_INET,
989 SOCK_STREAM, IPPROTO_TCP, &csocket, 1);
991 pr_err("%s (%d): problem creating socket\n",
992 __func__, task_pid_nr(current));
997 err = p9_bind_privport(csocket);
999 pr_err("%s (%d): problem binding to privport\n",
1000 __func__, task_pid_nr(current));
1001 sock_release(csocket);
1006 err = csocket->ops->connect(csocket,
1007 (struct sockaddr *)&sin_server,
1008 sizeof(struct sockaddr_in), 0);
1010 pr_err("%s (%d): problem connecting socket to %s\n",
1011 __func__, task_pid_nr(current), addr);
1012 sock_release(csocket);
1016 return p9_socket_open(client, csocket);
1020 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
1023 struct socket *csocket;
1024 struct sockaddr_un sun_server;
1028 if (!addr || !strlen(addr))
1031 if (strlen(addr) >= UNIX_PATH_MAX) {
1032 pr_err("%s (%d): address too long: %s\n",
1033 __func__, task_pid_nr(current), addr);
1034 return -ENAMETOOLONG;
1037 sun_server.sun_family = PF_UNIX;
1038 strcpy(sun_server.sun_path, addr);
1039 err = __sock_create(current->nsproxy->net_ns, PF_UNIX,
1040 SOCK_STREAM, 0, &csocket, 1);
1042 pr_err("%s (%d): problem creating socket\n",
1043 __func__, task_pid_nr(current));
1047 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1048 sizeof(struct sockaddr_un) - 1, 0);
1050 pr_err("%s (%d): problem connecting socket: %s: %d\n",
1051 __func__, task_pid_nr(current), addr, err);
1052 sock_release(csocket);
1056 return p9_socket_open(client, csocket);
1060 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1063 struct p9_fd_opts opts;
1065 parse_opts(args, &opts);
1066 client->trans_opts.fd.rfd = opts.rfd;
1067 client->trans_opts.fd.wfd = opts.wfd;
1069 if (opts.rfd == ~0 || opts.wfd == ~0) {
1070 pr_err("Insufficient options for proto=fd\n");
1071 return -ENOPROTOOPT;
1074 err = p9_fd_open(client, opts.rfd, opts.wfd);
1078 p9_conn_create(client);
1083 static struct p9_trans_module p9_tcp_trans = {
1085 .maxsize = MAX_SOCK_BUF,
1087 .create = p9_fd_create_tcp,
1088 .close = p9_fd_close,
1089 .request = p9_fd_request,
1090 .cancel = p9_fd_cancel,
1091 .cancelled = p9_fd_cancelled,
1092 .show_options = p9_fd_show_options,
1093 .owner = THIS_MODULE,
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,
1109 static struct p9_trans_module p9_fd_trans = {
1111 .maxsize = MAX_SOCK_BUF,
1113 .create = p9_fd_create,
1114 .close = p9_fd_close,
1115 .request = p9_fd_request,
1116 .cancel = p9_fd_cancel,
1117 .cancelled = p9_fd_cancelled,
1118 .show_options = p9_fd_show_options,
1119 .owner = THIS_MODULE,
1123 * p9_poll_workfn - poll worker thread
1126 * polls all v9fs transports for new events and queues the appropriate
1127 * work to the work queue
1131 static void p9_poll_workfn(struct work_struct *work)
1133 unsigned long flags;
1135 p9_debug(P9_DEBUG_TRANS, "start %p\n", current);
1137 spin_lock_irqsave(&p9_poll_lock, flags);
1138 while (!list_empty(&p9_poll_pending_list)) {
1139 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1142 list_del_init(&conn->poll_pending_link);
1143 spin_unlock_irqrestore(&p9_poll_lock, flags);
1147 spin_lock_irqsave(&p9_poll_lock, flags);
1149 spin_unlock_irqrestore(&p9_poll_lock, flags);
1151 p9_debug(P9_DEBUG_TRANS, "finish\n");
1154 int p9_trans_fd_init(void)
1156 v9fs_register_trans(&p9_tcp_trans);
1157 v9fs_register_trans(&p9_unix_trans);
1158 v9fs_register_trans(&p9_fd_trans);
1163 void p9_trans_fd_exit(void)
1165 flush_work(&p9_poll_work);
1166 v9fs_unregister_trans(&p9_tcp_trans);
1167 v9fs_unregister_trans(&p9_unix_trans);
1168 v9fs_unregister_trans(&p9_fd_trans);