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
29 #include <linux/module.h>
30 #include <linux/net.h>
31 #include <linux/ipv6.h>
32 #include <linux/kthread.h>
33 #include <linux/errno.h>
34 #include <linux/kernel.h>
36 #include <linux/uaccess.h>
37 #include <linux/inet.h>
38 #include <linux/idr.h>
39 #include <linux/file.h>
40 #include <linux/parser.h>
41 #include <net/9p/9p.h>
42 #include <net/9p/client.h>
43 #include <net/9p/transport.h>
46 #define MAX_SOCK_BUF (64*1024)
47 #define MAXPOLLWADDR 2
50 * struct p9_fd_opts - per-transport options
51 * @rfd: file descriptor for reading (trans=fd)
52 * @wfd: file descriptor for writing (trans=fd)
53 * @port: port to connect to (trans=tcp)
64 * struct p9_trans_fd - transport state
65 * @rd: reference to file to read from
66 * @wr: reference of file to write to
67 * @conn: connection state reference
78 * Option Parsing (code inspired by NFS code)
79 * - a little lazy - parse all fd-transport options
83 /* Options that take integer arguments */
84 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
87 static const match_table_t tokens = {
88 {Opt_port, "port=%u"},
89 {Opt_rfdno, "rfdno=%u"},
90 {Opt_wfdno, "wfdno=%u"},
95 Rworksched = 1, /* read work scheduled or running */
96 Rpending = 2, /* can read */
97 Wworksched = 4, /* write work scheduled or running */
98 Wpending = 8, /* can write */
101 struct p9_poll_wait {
102 struct p9_conn *conn;
104 wait_queue_head_t *wait_addr;
108 * struct p9_conn - fd mux connection state information
109 * @mux_list: list link for mux to manage multiple connections (?)
110 * @client: reference to client instance for this connection
112 * @req_list: accounting for requests which have been sent
113 * @unsent_req_list: accounting for requests that haven't been sent
114 * @rcall: current response &p9_fcall structure
115 * @rpos: read position in current frame
116 * @rbuf: current read buffer
117 * @wpos: write position for current frame
118 * @wsize: amount of data to write for current frame
119 * @wbuf: current write buffer
120 * @poll_wait: array of wait_q's for various worker threads
123 * @rq: current read work
124 * @wq: current write work
130 struct list_head mux_list;
131 struct p9_client *client;
133 struct list_head req_list;
134 struct list_head unsent_req_list;
135 struct p9_fcall *rcall;
141 struct list_head poll_pending_link;
142 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
144 struct work_struct rq;
145 struct work_struct wq;
146 unsigned long wsched;
149 static DEFINE_SPINLOCK(p9_poll_lock);
150 static LIST_HEAD(p9_poll_pending_list);
151 static struct workqueue_struct *p9_mux_wq;
152 static struct task_struct *p9_poll_task;
154 static void p9_mux_poll_stop(struct p9_conn *m)
159 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
160 struct p9_poll_wait *pwait = &m->poll_wait[i];
162 if (pwait->wait_addr) {
163 remove_wait_queue(pwait->wait_addr, &pwait->wait);
164 pwait->wait_addr = NULL;
168 spin_lock_irqsave(&p9_poll_lock, flags);
169 list_del_init(&m->poll_pending_link);
170 spin_unlock_irqrestore(&p9_poll_lock, flags);
173 static void p9_conn_rpc_cb(struct p9_client *, struct p9_req_t *);
175 static void p9_mux_flush_cb(struct p9_client *client, struct p9_req_t *freq)
177 struct p9_conn *m = client->trans;
178 struct p9_req_t *req;
180 P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m,
181 freq->tc, freq->rc, freq->t_err,
182 freq->tc->params.tflush.oldtag);
184 req = p9_tag_lookup(client, freq->tc->params.tflush.oldtag);
186 req->status = REQ_STATUS_FLSHD;
187 list_del(&req->req_list);
188 p9_conn_rpc_cb(client, req);
191 p9_free_req(client, freq);
194 static void p9_conn_rpc_cb(struct p9_client *client, struct p9_req_t *req)
196 P9_DPRINTK(P9_DEBUG_MUX, "req %p\n", req);
198 if (req->tc->id == P9_TFLUSH) { /* flush callback */
199 P9_DPRINTK(P9_DEBUG_MUX, "flush req %p\n", req);
200 p9_mux_flush_cb(client, req);
201 } else { /* normal wakeup path */
202 P9_DPRINTK(P9_DEBUG_MUX, "normal req %p\n", req);
203 if (!req->t_err && (req->status == REQ_STATUS_FLSHD ||
204 req->status == REQ_STATUS_FLSH))
205 req->t_err = -ERESTARTSYS;
212 * p9_conn_cancel - cancel all pending requests with error
218 void p9_conn_cancel(struct p9_conn *m, int err)
220 struct p9_req_t *req, *rtmp;
221 LIST_HEAD(cancel_list);
223 P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
225 spin_lock(&m->client->lock);
226 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
227 req->status = REQ_STATUS_ERROR;
230 list_move(&req->req_list, &cancel_list);
232 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
233 req->status = REQ_STATUS_ERROR;
236 list_move(&req->req_list, &cancel_list);
238 spin_unlock(&m->client->lock);
240 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
241 list_del(&req->req_list);
242 p9_conn_rpc_cb(m->client, req);
246 static void process_request(struct p9_conn *m, struct p9_req_t *req)
249 struct p9_str *ename;
251 if (!req->t_err && req->rc->id == P9_RERROR) {
252 ecode = req->rc->params.rerror.errno;
253 ename = &req->rc->params.rerror.error;
255 P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len,
262 req->t_err = p9_errstr2errno(ename->str, ename->len);
264 /* string match failed */
266 PRINT_FCALL_ERROR("unknown error", req->rc);
267 req->t_err = -ESERVERFAULT;
270 } else if (req->tc && req->rc->id != req->tc->id + 1) {
271 P9_DPRINTK(P9_DEBUG_ERROR,
272 "fcall mismatch: expected %d, got %d\n",
273 req->tc->id + 1, req->rc->id);
280 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
283 struct p9_trans_fd *ts = NULL;
285 if (client && client->status == Connected)
291 if (!ts->rd->f_op || !ts->rd->f_op->poll)
294 if (!ts->wr->f_op || !ts->wr->f_op->poll)
297 ret = ts->rd->f_op->poll(ts->rd, pt);
301 if (ts->rd != ts->wr) {
302 n = ts->wr->f_op->poll(ts->wr, pt);
305 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
312 * p9_fd_read- read from a fd
313 * @client: client instance
314 * @v: buffer to receive data into
315 * @len: size of receive buffer
319 static int p9_fd_read(struct p9_client *client, void *v, int len)
322 struct p9_trans_fd *ts = NULL;
324 if (client && client->status != Disconnected)
330 if (!(ts->rd->f_flags & O_NONBLOCK))
331 P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
333 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
334 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
335 client->status = Disconnected;
340 * p9_read_work - called when there is some data to be read from a transport
341 * @work: container of work to be done
345 static void p9_read_work(struct work_struct *work)
349 struct p9_req_t *req;
350 struct p9_fcall *rcall;
353 m = container_of(work, struct p9_conn, rq);
359 P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
363 kmalloc(sizeof(struct p9_fcall) + m->client->msize,
370 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
374 clear_bit(Rpending, &m->wsched);
375 err = p9_fd_read(m->client, m->rbuf + m->rpos,
376 m->client->msize - m->rpos);
377 P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err);
378 if (err == -EAGAIN) {
379 clear_bit(Rworksched, &m->wsched);
387 while (m->rpos > 4) {
388 n = le32_to_cpu(*(__le32 *) m->rbuf);
389 if (n >= m->client->msize) {
390 P9_DPRINTK(P9_DEBUG_ERROR,
391 "requested packet size too big: %d\n", n);
400 p9_deserialize_fcall(m->rbuf, n, m->rcall, m->client->dotu);
404 #ifdef CONFIG_NET_9P_DEBUG
405 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
408 p9_printfcall(buf, sizeof(buf), m->rcall,
410 printk(KERN_NOTICE ">>> %p %s\n", m, buf);
417 m->rcall = kmalloc(sizeof(struct p9_fcall) +
418 m->client->msize, GFP_KERNEL);
424 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
425 memmove(m->rbuf, rbuf + n, m->rpos - n);
433 P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m,
434 rcall->id, rcall->tag);
436 req = p9_tag_lookup(m->client, rcall->tag);
439 if (req->status != REQ_STATUS_FLSH) {
440 list_del(&req->req_list);
441 req->status = REQ_STATUS_RCVD;
445 process_request(m, req);
447 if (req->status != REQ_STATUS_FLSH)
448 p9_conn_rpc_cb(m->client, req);
450 if (err >= 0 && rcall->id != P9_RFLUSH)
451 P9_DPRINTK(P9_DEBUG_ERROR,
452 "unexpected response mux %p id %d tag %d\n",
453 m, rcall->id, rcall->tag);
458 if (!list_empty(&m->req_list)) {
459 if (test_and_clear_bit(Rpending, &m->wsched))
462 n = p9_fd_poll(m->client, NULL);
465 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
466 queue_work(p9_mux_wq, &m->rq);
468 clear_bit(Rworksched, &m->wsched);
470 clear_bit(Rworksched, &m->wsched);
475 p9_conn_cancel(m, err);
476 clear_bit(Rworksched, &m->wsched);
480 * p9_fd_write - write to a socket
481 * @client: client instance
482 * @v: buffer to send data from
483 * @len: size of send buffer
487 static int p9_fd_write(struct p9_client *client, void *v, int len)
491 struct p9_trans_fd *ts = NULL;
493 if (client && client->status != Disconnected)
499 if (!(ts->wr->f_flags & O_NONBLOCK))
500 P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
504 /* The cast to a user pointer is valid due to the set_fs() */
505 ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos);
508 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
509 client->status = Disconnected;
514 * p9_write_work - called when a transport can send some data
515 * @work: container for work to be done
519 static void p9_write_work(struct work_struct *work)
523 struct p9_req_t *req;
525 m = container_of(work, struct p9_conn, wq);
528 clear_bit(Wworksched, &m->wsched);
533 if (list_empty(&m->unsent_req_list)) {
534 clear_bit(Wworksched, &m->wsched);
538 spin_lock(&m->client->lock);
539 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
541 req->status = REQ_STATUS_SENT;
542 list_move_tail(&req->req_list, &m->req_list);
544 m->wbuf = req->tc->sdata;
545 m->wsize = req->tc->size;
547 spin_unlock(&m->client->lock);
550 P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos,
552 clear_bit(Wpending, &m->wsched);
553 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
554 P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err);
555 if (err == -EAGAIN) {
556 clear_bit(Wworksched, &m->wsched);
568 if (m->wpos == m->wsize)
569 m->wpos = m->wsize = 0;
571 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
572 if (test_and_clear_bit(Wpending, &m->wsched))
575 n = p9_fd_poll(m->client, NULL);
578 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
579 queue_work(p9_mux_wq, &m->wq);
581 clear_bit(Wworksched, &m->wsched);
583 clear_bit(Wworksched, &m->wsched);
588 p9_conn_cancel(m, err);
589 clear_bit(Wworksched, &m->wsched);
592 static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key)
594 struct p9_poll_wait *pwait =
595 container_of(wait, struct p9_poll_wait, wait);
596 struct p9_conn *m = pwait->conn;
598 DECLARE_WAITQUEUE(dummy_wait, p9_poll_task);
600 spin_lock_irqsave(&p9_poll_lock, flags);
601 if (list_empty(&m->poll_pending_link))
602 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
603 spin_unlock_irqrestore(&p9_poll_lock, flags);
605 /* perform the default wake up operation */
606 return default_wake_function(&dummy_wait, mode, sync, key);
610 * p9_pollwait - add poll task to the wait queue
611 * @filp: file pointer being polled
612 * @wait_address: wait_q to block on
615 * called by files poll operation to add v9fs-poll task to files wait queue
619 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
621 struct p9_conn *m = container_of(p, struct p9_conn, pt);
622 struct p9_poll_wait *pwait = NULL;
625 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
626 if (m->poll_wait[i].wait_addr == NULL) {
627 pwait = &m->poll_wait[i];
633 P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
638 P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n");
639 pwait->wait_addr = ERR_PTR(-EIO);
644 pwait->wait_addr = wait_address;
645 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
646 add_wait_queue(wait_address, &pwait->wait);
650 * p9_conn_create - allocate and initialize the per-session mux data
651 * @client: client instance
653 * Note: Creates the polling task if this is the first session.
656 static struct p9_conn *p9_conn_create(struct p9_client *client)
661 P9_DPRINTK(P9_DEBUG_MUX, "client %p msize %d\n", client, client->msize);
662 m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
664 return ERR_PTR(-ENOMEM);
666 INIT_LIST_HEAD(&m->mux_list);
669 INIT_LIST_HEAD(&m->req_list);
670 INIT_LIST_HEAD(&m->unsent_req_list);
671 INIT_WORK(&m->rq, p9_read_work);
672 INIT_WORK(&m->wq, p9_write_work);
673 INIT_LIST_HEAD(&m->poll_pending_link);
674 init_poll_funcptr(&m->pt, p9_pollwait);
676 n = p9_fd_poll(client, &m->pt);
678 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
679 set_bit(Rpending, &m->wsched);
683 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
684 set_bit(Wpending, &m->wsched);
687 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
688 if (IS_ERR(m->poll_wait[i].wait_addr)) {
691 /* return the error code */
692 return (void *)m->poll_wait[i].wait_addr;
700 * p9_poll_mux - polls a mux and schedules read or write works if necessary
701 * @m: connection to poll
705 static void p9_poll_mux(struct p9_conn *m)
712 n = p9_fd_poll(m->client, NULL);
713 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
714 P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n);
717 p9_conn_cancel(m, n);
721 set_bit(Rpending, &m->wsched);
722 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
723 if (!test_and_set_bit(Rworksched, &m->wsched)) {
724 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
725 queue_work(p9_mux_wq, &m->rq);
730 set_bit(Wpending, &m->wsched);
731 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
732 if ((m->wsize || !list_empty(&m->unsent_req_list))
733 && !test_and_set_bit(Wworksched, &m->wsched)) {
734 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
735 queue_work(p9_mux_wq, &m->wq);
741 * p9_send_request - send 9P request
742 * The function can sleep until the request is scheduled for sending.
743 * The function can be interrupted. Return from the function is not
744 * a guarantee that the request is sent successfully. Can return errors
745 * that can be retrieved by PTR_ERR macros.
748 * @tc: request to be sent
752 static struct p9_req_t *p9_send_request(struct p9_conn *m, struct p9_fcall *tc)
756 struct p9_req_t *req;
758 P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current,
761 return ERR_PTR(m->err);
764 if (tc->id != P9_TVERSION) {
765 tag = p9_idpool_get(m->client->tagpool);
767 return ERR_PTR(-ENOMEM);
772 req = p9_tag_alloc(m->client, tag);
774 #ifdef CONFIG_NET_9P_DEBUG
775 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
778 p9_printfcall(buf, sizeof(buf), tc, m->client->dotu);
779 printk(KERN_NOTICE "<<< %p %s\n", m, buf);
787 req->status = REQ_STATUS_UNSENT;
789 spin_lock(&m->client->lock);
790 list_add_tail(&req->req_list, &m->unsent_req_list);
791 spin_unlock(&m->client->lock);
793 if (test_and_clear_bit(Wpending, &m->wsched))
796 n = p9_fd_poll(m->client, NULL);
798 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
799 queue_work(p9_mux_wq, &m->wq);
805 p9_mux_flush_request(struct p9_conn *m, struct p9_req_t *req)
808 struct p9_req_t *rreq, *rptr;
810 P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag);
812 /* if a response was received for a request, do nothing */
813 if (req->rc || req->t_err) {
814 P9_DPRINTK(P9_DEBUG_MUX,
815 "mux %p req %p response already received\n", m, req);
819 req->status = REQ_STATUS_FLSH;
821 spin_lock(&m->client->lock);
822 /* if the request is not sent yet, just remove it from the list */
823 list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) {
824 if (rreq->tag == req->tag) {
825 P9_DPRINTK(P9_DEBUG_MUX,
826 "mux %p req %p request is not sent yet\n", m, req);
827 list_del(&rreq->req_list);
828 req->status = REQ_STATUS_FLSHD;
829 spin_unlock(&m->client->lock);
830 p9_conn_rpc_cb(m->client, req);
834 spin_unlock(&m->client->lock);
836 clear_thread_flag(TIF_SIGPENDING);
837 fc = p9_create_tflush(req->tag);
838 p9_send_request(m, fc);
843 * p9_fd_rpc- sends 9P request and waits until a response is available.
844 * The function can be interrupted.
845 * @client: client instance
846 * @tc: request to be sent
847 * @rc: pointer where a pointer to the response is stored
852 p9_fd_rpc(struct p9_client *client, struct p9_fcall *tc, struct p9_fcall **rc)
854 struct p9_trans_fd *p = client->trans;
855 struct p9_conn *m = p->conn;
858 struct p9_req_t *req;
864 if (signal_pending(current)) {
866 clear_thread_flag(TIF_SIGPENDING);
869 req = p9_send_request(m, tc);
872 P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err);
876 err = wait_event_interruptible(*req->wq, req->rc != NULL ||
881 if (err == -ERESTARTSYS && client->status == Connected
883 if (p9_mux_flush_request(m, req)) {
884 /* wait until we get response of the flush message */
886 clear_thread_flag(TIF_SIGPENDING);
887 err = wait_event_interruptible(*req->wq,
888 req->rc || req->t_err);
889 } while (!req->rc && !req->t_err &&
890 err == -ERESTARTSYS &&
891 client->status == Connected && !m->err);
899 spin_lock_irqsave(¤t->sighand->siglock, flags);
901 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
909 p9_free_req(client, req);
917 * parse_options - parse mount options into session structure
918 * @options: options string passed from mount
919 * @opts: transport-specific structure to parse options into
921 * Returns 0 upon success, -ERRNO upon failure
924 static int parse_opts(char *params, struct p9_fd_opts *opts)
927 substring_t args[MAX_OPT_ARGS];
932 opts->port = P9_PORT;
939 options = kstrdup(params, GFP_KERNEL);
941 P9_DPRINTK(P9_DEBUG_ERROR,
942 "failed to allocate copy of option string\n");
946 while ((p = strsep(&options, ",")) != NULL) {
951 token = match_token(p, tokens, args);
952 r = match_int(&args[0], &option);
954 P9_DPRINTK(P9_DEBUG_ERROR,
955 "integer field, but no integer?\n");
977 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
979 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
986 if (!ts->rd || !ts->wr) {
996 client->status = Connected;
1001 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
1005 csocket->sk->sk_allocation = GFP_NOIO;
1006 fd = sock_map_fd(csocket, 0);
1008 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
1012 ret = p9_fd_open(client, fd, fd);
1014 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n");
1015 sockfd_put(csocket);
1019 ((struct p9_trans_fd *)client->trans)->rd->f_flags |= O_NONBLOCK;
1025 * p9_mux_destroy - cancels all pending requests and frees mux resources
1026 * @m: mux to destroy
1030 static void p9_conn_destroy(struct p9_conn *m)
1032 P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m,
1033 m->mux_list.prev, m->mux_list.next);
1035 p9_mux_poll_stop(m);
1036 cancel_work_sync(&m->rq);
1037 cancel_work_sync(&m->wq);
1039 p9_conn_cancel(m, -ECONNRESET);
1046 * p9_fd_close - shutdown file descriptor transport
1047 * @client: client instance
1051 static void p9_fd_close(struct p9_client *client)
1053 struct p9_trans_fd *ts;
1062 client->status = Disconnected;
1064 p9_conn_destroy(ts->conn);
1075 * stolen from NFS - maybe should be made a generic function?
1077 static inline int valid_ipaddr4(const char *buf)
1079 int rc, count, in[4];
1081 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
1084 for (count = 0; count < 4; count++) {
1085 if (in[count] > 255)
1092 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
1095 struct socket *csocket;
1096 struct sockaddr_in sin_server;
1097 struct p9_fd_opts opts;
1098 struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
1100 err = parse_opts(args, &opts);
1104 if (valid_ipaddr4(addr) < 0)
1109 sin_server.sin_family = AF_INET;
1110 sin_server.sin_addr.s_addr = in_aton(addr);
1111 sin_server.sin_port = htons(opts.port);
1112 sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
1115 P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n");
1120 err = csocket->ops->connect(csocket,
1121 (struct sockaddr *)&sin_server,
1122 sizeof(struct sockaddr_in), 0);
1124 P9_EPRINTK(KERN_ERR,
1125 "p9_trans_tcp: problem connecting socket to %s\n",
1130 err = p9_socket_open(client, csocket);
1134 p = (struct p9_trans_fd *) client->trans;
1135 p->conn = p9_conn_create(client);
1136 if (IS_ERR(p->conn)) {
1137 err = PTR_ERR(p->conn);
1146 sock_release(csocket);
1154 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
1157 struct socket *csocket;
1158 struct sockaddr_un sun_server;
1159 struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
1163 if (strlen(addr) > UNIX_PATH_MAX) {
1164 P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
1166 err = -ENAMETOOLONG;
1170 sun_server.sun_family = PF_UNIX;
1171 strcpy(sun_server.sun_path, addr);
1172 sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
1173 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1174 sizeof(struct sockaddr_un) - 1, 0);
1176 P9_EPRINTK(KERN_ERR,
1177 "p9_trans_unix: problem connecting socket: %s: %d\n",
1182 err = p9_socket_open(client, csocket);
1186 p = (struct p9_trans_fd *) client->trans;
1187 p->conn = p9_conn_create(client);
1188 if (IS_ERR(p->conn)) {
1189 err = PTR_ERR(p->conn);
1198 sock_release(csocket);
1205 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1208 struct p9_fd_opts opts;
1209 struct p9_trans_fd *p = NULL; /* this get allocated in p9_fd_open */
1211 parse_opts(args, &opts);
1213 if (opts.rfd == ~0 || opts.wfd == ~0) {
1214 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
1215 return -ENOPROTOOPT;
1218 err = p9_fd_open(client, opts.rfd, opts.wfd);
1222 p = (struct p9_trans_fd *) client->trans;
1223 p->conn = p9_conn_create(client);
1224 if (IS_ERR(p->conn)) {
1225 err = PTR_ERR(p->conn);
1237 static struct p9_trans_module p9_tcp_trans = {
1239 .maxsize = MAX_SOCK_BUF,
1241 .create = p9_fd_create_tcp,
1242 .close = p9_fd_close,
1244 .owner = THIS_MODULE,
1247 static struct p9_trans_module p9_unix_trans = {
1249 .maxsize = MAX_SOCK_BUF,
1251 .create = p9_fd_create_unix,
1252 .close = p9_fd_close,
1254 .owner = THIS_MODULE,
1257 static struct p9_trans_module p9_fd_trans = {
1259 .maxsize = MAX_SOCK_BUF,
1261 .create = p9_fd_create,
1262 .close = p9_fd_close,
1264 .owner = THIS_MODULE,
1268 * p9_poll_proc - poll worker thread
1269 * @a: thread state and arguments
1271 * polls all v9fs transports for new events and queues the appropriate
1272 * work to the work queue
1276 static int p9_poll_proc(void *a)
1278 unsigned long flags;
1280 P9_DPRINTK(P9_DEBUG_MUX, "start %p\n", current);
1282 spin_lock_irqsave(&p9_poll_lock, flags);
1283 while (!list_empty(&p9_poll_pending_list)) {
1284 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1287 list_del_init(&conn->poll_pending_link);
1288 spin_unlock_irqrestore(&p9_poll_lock, flags);
1292 spin_lock_irqsave(&p9_poll_lock, flags);
1294 spin_unlock_irqrestore(&p9_poll_lock, flags);
1296 set_current_state(TASK_INTERRUPTIBLE);
1297 if (list_empty(&p9_poll_pending_list)) {
1298 P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n");
1301 __set_current_state(TASK_RUNNING);
1303 if (!kthread_should_stop())
1306 P9_DPRINTK(P9_DEBUG_MUX, "finish\n");
1310 int p9_trans_fd_init(void)
1312 p9_mux_wq = create_workqueue("v9fs");
1314 printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n");
1318 p9_poll_task = kthread_run(p9_poll_proc, NULL, "v9fs-poll");
1319 if (IS_ERR(p9_poll_task)) {
1320 destroy_workqueue(p9_mux_wq);
1321 printk(KERN_WARNING "v9fs: mux: creating poll task failed\n");
1322 return PTR_ERR(p9_poll_task);
1325 v9fs_register_trans(&p9_tcp_trans);
1326 v9fs_register_trans(&p9_unix_trans);
1327 v9fs_register_trans(&p9_fd_trans);
1332 void p9_trans_fd_exit(void)
1334 kthread_stop(p9_poll_task);
1335 v9fs_unregister_trans(&p9_tcp_trans);
1336 v9fs_unregister_trans(&p9_unix_trans);
1337 v9fs_unregister_trans(&p9_fd_trans);
1339 destroy_workqueue(p9_mux_wq);