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 * @req: current request being processed (if any)
115 * @tmp_buf: temporary buffer to read in header
116 * @rsize: amount to read for current frame
117 * @rpos: read position in current frame
118 * @rbuf: current read buffer
119 * @wpos: write position for current frame
120 * @wsize: amount of data to write for current frame
121 * @wbuf: current write buffer
122 * @poll_wait: array of wait_q's for various worker threads
125 * @rq: current read work
126 * @wq: current write work
132 struct list_head mux_list;
133 struct p9_client *client;
135 struct list_head req_list;
136 struct list_head unsent_req_list;
137 struct p9_req_t *req;
145 struct list_head poll_pending_link;
146 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
148 struct work_struct rq;
149 struct work_struct wq;
150 unsigned long wsched;
153 static DEFINE_SPINLOCK(p9_poll_lock);
154 static LIST_HEAD(p9_poll_pending_list);
155 static struct workqueue_struct *p9_mux_wq;
156 static struct task_struct *p9_poll_task;
158 static void p9_mux_poll_stop(struct p9_conn *m)
163 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
164 struct p9_poll_wait *pwait = &m->poll_wait[i];
166 if (pwait->wait_addr) {
167 remove_wait_queue(pwait->wait_addr, &pwait->wait);
168 pwait->wait_addr = NULL;
172 spin_lock_irqsave(&p9_poll_lock, flags);
173 list_del_init(&m->poll_pending_link);
174 spin_unlock_irqrestore(&p9_poll_lock, flags);
177 static void p9_conn_rpc_cb(struct p9_client *, struct p9_req_t *);
179 static void p9_mux_flush_cb(struct p9_client *client, struct p9_req_t *freq)
181 struct p9_conn *m = client->trans;
182 struct p9_req_t *req;
184 P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m,
185 freq->tc, freq->rc, freq->t_err,
186 freq->tc->params.tflush.oldtag);
188 req = p9_tag_lookup(client, freq->tc->params.tflush.oldtag);
190 req->status = REQ_STATUS_FLSHD;
191 list_del(&req->req_list);
192 p9_conn_rpc_cb(client, req);
195 p9_free_req(client, freq);
198 static void p9_conn_rpc_cb(struct p9_client *client, struct p9_req_t *req)
200 P9_DPRINTK(P9_DEBUG_MUX, "req %p\n", req);
202 if (req->tc->id == P9_TFLUSH) { /* flush callback */
203 P9_DPRINTK(P9_DEBUG_MUX, "flush req %p\n", req);
204 p9_mux_flush_cb(client, req);
205 } else { /* normal wakeup path */
206 P9_DPRINTK(P9_DEBUG_MUX, "normal req %p\n", req);
207 if (!req->t_err && (req->status == REQ_STATUS_FLSHD ||
208 req->status == REQ_STATUS_FLSH))
209 req->t_err = -ERESTARTSYS;
216 * p9_conn_cancel - cancel all pending requests with error
222 void p9_conn_cancel(struct p9_conn *m, int err)
224 struct p9_req_t *req, *rtmp;
225 LIST_HEAD(cancel_list);
227 P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
229 spin_lock(&m->client->lock);
230 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
231 req->status = REQ_STATUS_ERROR;
234 list_move(&req->req_list, &cancel_list);
236 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
237 req->status = REQ_STATUS_ERROR;
240 list_move(&req->req_list, &cancel_list);
242 spin_unlock(&m->client->lock);
244 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
245 list_del(&req->req_list);
246 p9_conn_rpc_cb(m->client, req);
250 static void process_request(struct p9_conn *m, struct p9_req_t *req)
253 struct p9_str *ename;
255 if (!req->t_err && req->rc->id == P9_RERROR) {
256 ecode = req->rc->params.rerror.errno;
257 ename = &req->rc->params.rerror.error;
259 P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len,
266 req->t_err = p9_errstr2errno(ename->str, ename->len);
268 /* string match failed */
270 PRINT_FCALL_ERROR("unknown error", req->rc);
271 req->t_err = -ESERVERFAULT;
274 } else if (req->tc && req->rc->id != req->tc->id + 1) {
275 P9_DPRINTK(P9_DEBUG_ERROR,
276 "fcall mismatch: expected %d, got %d\n",
277 req->tc->id + 1, req->rc->id);
284 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
287 struct p9_trans_fd *ts = NULL;
289 if (client && client->status == Connected)
295 if (!ts->rd->f_op || !ts->rd->f_op->poll)
298 if (!ts->wr->f_op || !ts->wr->f_op->poll)
301 ret = ts->rd->f_op->poll(ts->rd, pt);
305 if (ts->rd != ts->wr) {
306 n = ts->wr->f_op->poll(ts->wr, pt);
309 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
316 * p9_fd_read- read from a fd
317 * @client: client instance
318 * @v: buffer to receive data into
319 * @len: size of receive buffer
323 static int p9_fd_read(struct p9_client *client, void *v, int len)
326 struct p9_trans_fd *ts = NULL;
328 if (client && client->status != Disconnected)
334 if (!(ts->rd->f_flags & O_NONBLOCK))
335 P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
337 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
338 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
339 client->status = Disconnected;
344 * p9_read_work - called when there is some data to be read from a transport
345 * @work: container of work to be done
349 static void p9_read_work(struct work_struct *work)
354 m = container_of(work, struct p9_conn, rq);
359 P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
362 m->rbuf = m->tmp_buf;
364 m->rsize = 7; /* start by reading header */
367 clear_bit(Rpending, &m->wsched);
368 P9_DPRINTK(P9_DEBUG_MUX, "read mux %p pos %d size: %d = %d\n", m,
369 m->rpos, m->rsize, m->rsize-m->rpos);
370 err = p9_fd_read(m->client, m->rbuf + m->rpos,
372 P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err);
373 if (err == -EAGAIN) {
374 clear_bit(Rworksched, &m->wsched);
383 if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */
385 P9_DPRINTK(P9_DEBUG_MUX, "got new header\n");
387 n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */
388 if (n >= m->client->msize) {
389 P9_DPRINTK(P9_DEBUG_ERROR,
390 "requested packet size too big: %d\n", n);
395 tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */
396 P9_DPRINTK(P9_DEBUG_MUX, "mux %p pkt: size: %d bytes tag: %d\n",
399 m->req = p9_tag_lookup(m->client, tag);
401 P9_DPRINTK(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
407 if (m->req->rc == NULL) {
408 m->req->rc = kmalloc(sizeof(struct p9_fcall) +
409 m->client->msize, GFP_KERNEL);
416 m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall);
417 memcpy(m->rbuf, m->tmp_buf, m->rsize);
421 /* not an else because some packets (like clunk) have no payload */
422 if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */
423 P9_DPRINTK(P9_DEBUG_MUX, "got new packet\n");
424 m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall);
425 err = p9_deserialize_fcall(m->rbuf, m->rsize, m->req->rc,
432 #ifdef CONFIG_NET_9P_DEBUG
433 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
436 p9_printfcall(buf, sizeof(buf), m->req->rc,
438 printk(KERN_NOTICE ">>> %p %s\n", m, buf);
442 P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m,
443 m->req->rc->id, m->req->rc->tag);
449 if (m->req->status != REQ_STATUS_FLSH) {
450 list_del(&m->req->req_list);
451 m->req->status = REQ_STATUS_RCVD;
454 process_request(m, m->req);
456 if (m->req->status != REQ_STATUS_FLSH)
457 p9_conn_rpc_cb(m->client, m->req);
462 if (!list_empty(&m->req_list)) {
463 if (test_and_clear_bit(Rpending, &m->wsched))
466 n = p9_fd_poll(m->client, NULL);
469 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
470 queue_work(p9_mux_wq, &m->rq);
472 clear_bit(Rworksched, &m->wsched);
474 clear_bit(Rworksched, &m->wsched);
478 p9_conn_cancel(m, err);
479 clear_bit(Rworksched, &m->wsched);
483 * p9_fd_write - write to a socket
484 * @client: client instance
485 * @v: buffer to send data from
486 * @len: size of send buffer
490 static int p9_fd_write(struct p9_client *client, void *v, int len)
494 struct p9_trans_fd *ts = NULL;
496 if (client && client->status != Disconnected)
502 if (!(ts->wr->f_flags & O_NONBLOCK))
503 P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
507 /* The cast to a user pointer is valid due to the set_fs() */
508 ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos);
511 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
512 client->status = Disconnected;
517 * p9_write_work - called when a transport can send some data
518 * @work: container for work to be done
522 static void p9_write_work(struct work_struct *work)
526 struct p9_req_t *req;
528 m = container_of(work, struct p9_conn, wq);
531 clear_bit(Wworksched, &m->wsched);
536 if (list_empty(&m->unsent_req_list)) {
537 clear_bit(Wworksched, &m->wsched);
541 spin_lock(&m->client->lock);
542 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
544 req->status = REQ_STATUS_SENT;
545 list_move_tail(&req->req_list, &m->req_list);
547 m->wbuf = req->tc->sdata;
548 m->wsize = req->tc->size;
550 spin_unlock(&m->client->lock);
553 P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos,
555 clear_bit(Wpending, &m->wsched);
556 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
557 P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err);
558 if (err == -EAGAIN) {
559 clear_bit(Wworksched, &m->wsched);
571 if (m->wpos == m->wsize)
572 m->wpos = m->wsize = 0;
574 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
575 if (test_and_clear_bit(Wpending, &m->wsched))
578 n = p9_fd_poll(m->client, NULL);
581 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
582 queue_work(p9_mux_wq, &m->wq);
584 clear_bit(Wworksched, &m->wsched);
586 clear_bit(Wworksched, &m->wsched);
591 p9_conn_cancel(m, err);
592 clear_bit(Wworksched, &m->wsched);
595 static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key)
597 struct p9_poll_wait *pwait =
598 container_of(wait, struct p9_poll_wait, wait);
599 struct p9_conn *m = pwait->conn;
601 DECLARE_WAITQUEUE(dummy_wait, p9_poll_task);
603 spin_lock_irqsave(&p9_poll_lock, flags);
604 if (list_empty(&m->poll_pending_link))
605 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
606 spin_unlock_irqrestore(&p9_poll_lock, flags);
608 /* perform the default wake up operation */
609 return default_wake_function(&dummy_wait, mode, sync, key);
613 * p9_pollwait - add poll task to the wait queue
614 * @filp: file pointer being polled
615 * @wait_address: wait_q to block on
618 * called by files poll operation to add v9fs-poll task to files wait queue
622 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
624 struct p9_conn *m = container_of(p, struct p9_conn, pt);
625 struct p9_poll_wait *pwait = NULL;
628 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
629 if (m->poll_wait[i].wait_addr == NULL) {
630 pwait = &m->poll_wait[i];
636 P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
641 P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n");
642 pwait->wait_addr = ERR_PTR(-EIO);
647 pwait->wait_addr = wait_address;
648 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
649 add_wait_queue(wait_address, &pwait->wait);
653 * p9_conn_create - allocate and initialize the per-session mux data
654 * @client: client instance
656 * Note: Creates the polling task if this is the first session.
659 static struct p9_conn *p9_conn_create(struct p9_client *client)
664 P9_DPRINTK(P9_DEBUG_MUX, "client %p msize %d\n", client, client->msize);
665 m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
667 return ERR_PTR(-ENOMEM);
669 INIT_LIST_HEAD(&m->mux_list);
672 INIT_LIST_HEAD(&m->req_list);
673 INIT_LIST_HEAD(&m->unsent_req_list);
674 INIT_WORK(&m->rq, p9_read_work);
675 INIT_WORK(&m->wq, p9_write_work);
676 INIT_LIST_HEAD(&m->poll_pending_link);
677 init_poll_funcptr(&m->pt, p9_pollwait);
679 n = p9_fd_poll(client, &m->pt);
681 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
682 set_bit(Rpending, &m->wsched);
686 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
687 set_bit(Wpending, &m->wsched);
690 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
691 if (IS_ERR(m->poll_wait[i].wait_addr)) {
694 /* return the error code */
695 return (void *)m->poll_wait[i].wait_addr;
703 * p9_poll_mux - polls a mux and schedules read or write works if necessary
704 * @m: connection to poll
708 static void p9_poll_mux(struct p9_conn *m)
715 n = p9_fd_poll(m->client, NULL);
716 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
717 P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n);
720 p9_conn_cancel(m, n);
724 set_bit(Rpending, &m->wsched);
725 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
726 if (!test_and_set_bit(Rworksched, &m->wsched)) {
727 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
728 queue_work(p9_mux_wq, &m->rq);
733 set_bit(Wpending, &m->wsched);
734 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
735 if ((m->wsize || !list_empty(&m->unsent_req_list))
736 && !test_and_set_bit(Wworksched, &m->wsched)) {
737 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
738 queue_work(p9_mux_wq, &m->wq);
744 * p9_send_request - send 9P request
745 * The function can sleep until the request is scheduled for sending.
746 * The function can be interrupted. Return from the function is not
747 * a guarantee that the request is sent successfully. Can return errors
748 * that can be retrieved by PTR_ERR macros.
751 * @tc: request to be sent
755 static struct p9_req_t *p9_send_request(struct p9_conn *m, struct p9_fcall *tc)
759 struct p9_req_t *req;
761 P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current,
764 return ERR_PTR(m->err);
767 if (tc->id != P9_TVERSION) {
768 tag = p9_idpool_get(m->client->tagpool);
770 return ERR_PTR(-ENOMEM);
775 req = p9_tag_alloc(m->client, tag);
777 #ifdef CONFIG_NET_9P_DEBUG
778 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
781 p9_printfcall(buf, sizeof(buf), tc, m->client->dotu);
782 printk(KERN_NOTICE "<<< %p %s\n", m, buf);
790 req->status = REQ_STATUS_UNSENT;
792 spin_lock(&m->client->lock);
793 list_add_tail(&req->req_list, &m->unsent_req_list);
794 spin_unlock(&m->client->lock);
796 if (test_and_clear_bit(Wpending, &m->wsched))
799 n = p9_fd_poll(m->client, NULL);
801 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
802 queue_work(p9_mux_wq, &m->wq);
808 p9_mux_flush_request(struct p9_conn *m, struct p9_req_t *req)
811 struct p9_req_t *rreq, *rptr;
813 P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag);
815 /* if a response was received for a request, do nothing */
816 if (req->rc || req->t_err) {
817 P9_DPRINTK(P9_DEBUG_MUX,
818 "mux %p req %p response already received\n", m, req);
822 req->status = REQ_STATUS_FLSH;
824 spin_lock(&m->client->lock);
825 /* if the request is not sent yet, just remove it from the list */
826 list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) {
827 if (rreq->tag == req->tag) {
828 P9_DPRINTK(P9_DEBUG_MUX,
829 "mux %p req %p request is not sent yet\n", m, req);
830 list_del(&rreq->req_list);
831 req->status = REQ_STATUS_FLSHD;
832 spin_unlock(&m->client->lock);
833 p9_conn_rpc_cb(m->client, req);
837 spin_unlock(&m->client->lock);
839 clear_thread_flag(TIF_SIGPENDING);
840 fc = p9_create_tflush(req->tag);
841 p9_send_request(m, fc);
846 * p9_fd_rpc- sends 9P request and waits until a response is available.
847 * The function can be interrupted.
848 * @client: client instance
849 * @tc: request to be sent
850 * @rc: pointer where a pointer to the response is stored
855 p9_fd_rpc(struct p9_client *client, struct p9_fcall *tc, struct p9_fcall **rc)
857 struct p9_trans_fd *p = client->trans;
858 struct p9_conn *m = p->conn;
861 struct p9_req_t *req;
867 if (signal_pending(current)) {
869 clear_thread_flag(TIF_SIGPENDING);
872 req = p9_send_request(m, tc);
875 P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err);
879 err = wait_event_interruptible(*req->wq, req->rc != NULL ||
884 if (err == -ERESTARTSYS && client->status == Connected
886 if (p9_mux_flush_request(m, req)) {
887 /* wait until we get response of the flush message */
889 clear_thread_flag(TIF_SIGPENDING);
890 err = wait_event_interruptible(*req->wq,
891 req->rc || req->t_err);
892 } while (!req->rc && !req->t_err &&
893 err == -ERESTARTSYS &&
894 client->status == Connected && !m->err);
902 spin_lock_irqsave(¤t->sighand->siglock, flags);
904 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
912 p9_free_req(client, req);
920 * parse_options - parse mount options into session structure
921 * @options: options string passed from mount
922 * @opts: transport-specific structure to parse options into
924 * Returns 0 upon success, -ERRNO upon failure
927 static int parse_opts(char *params, struct p9_fd_opts *opts)
930 substring_t args[MAX_OPT_ARGS];
935 opts->port = P9_PORT;
942 options = kstrdup(params, GFP_KERNEL);
944 P9_DPRINTK(P9_DEBUG_ERROR,
945 "failed to allocate copy of option string\n");
949 while ((p = strsep(&options, ",")) != NULL) {
954 token = match_token(p, tokens, args);
955 r = match_int(&args[0], &option);
957 P9_DPRINTK(P9_DEBUG_ERROR,
958 "integer field, but no integer?\n");
980 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
982 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
989 if (!ts->rd || !ts->wr) {
999 client->status = Connected;
1004 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
1008 csocket->sk->sk_allocation = GFP_NOIO;
1009 fd = sock_map_fd(csocket, 0);
1011 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
1015 ret = p9_fd_open(client, fd, fd);
1017 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n");
1018 sockfd_put(csocket);
1022 ((struct p9_trans_fd *)client->trans)->rd->f_flags |= O_NONBLOCK;
1028 * p9_mux_destroy - cancels all pending requests and frees mux resources
1029 * @m: mux to destroy
1033 static void p9_conn_destroy(struct p9_conn *m)
1035 P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m,
1036 m->mux_list.prev, m->mux_list.next);
1038 p9_mux_poll_stop(m);
1039 cancel_work_sync(&m->rq);
1040 cancel_work_sync(&m->wq);
1042 p9_conn_cancel(m, -ECONNRESET);
1049 * p9_fd_close - shutdown file descriptor transport
1050 * @client: client instance
1054 static void p9_fd_close(struct p9_client *client)
1056 struct p9_trans_fd *ts;
1065 client->status = Disconnected;
1067 p9_conn_destroy(ts->conn);
1078 * stolen from NFS - maybe should be made a generic function?
1080 static inline int valid_ipaddr4(const char *buf)
1082 int rc, count, in[4];
1084 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
1087 for (count = 0; count < 4; count++) {
1088 if (in[count] > 255)
1095 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
1098 struct socket *csocket;
1099 struct sockaddr_in sin_server;
1100 struct p9_fd_opts opts;
1101 struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
1103 err = parse_opts(args, &opts);
1107 if (valid_ipaddr4(addr) < 0)
1112 sin_server.sin_family = AF_INET;
1113 sin_server.sin_addr.s_addr = in_aton(addr);
1114 sin_server.sin_port = htons(opts.port);
1115 sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
1118 P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n");
1123 err = csocket->ops->connect(csocket,
1124 (struct sockaddr *)&sin_server,
1125 sizeof(struct sockaddr_in), 0);
1127 P9_EPRINTK(KERN_ERR,
1128 "p9_trans_tcp: problem connecting socket to %s\n",
1133 err = p9_socket_open(client, csocket);
1137 p = (struct p9_trans_fd *) client->trans;
1138 p->conn = p9_conn_create(client);
1139 if (IS_ERR(p->conn)) {
1140 err = PTR_ERR(p->conn);
1149 sock_release(csocket);
1157 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
1160 struct socket *csocket;
1161 struct sockaddr_un sun_server;
1162 struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
1166 if (strlen(addr) > UNIX_PATH_MAX) {
1167 P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
1169 err = -ENAMETOOLONG;
1173 sun_server.sun_family = PF_UNIX;
1174 strcpy(sun_server.sun_path, addr);
1175 sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
1176 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1177 sizeof(struct sockaddr_un) - 1, 0);
1179 P9_EPRINTK(KERN_ERR,
1180 "p9_trans_unix: problem connecting socket: %s: %d\n",
1185 err = p9_socket_open(client, csocket);
1189 p = (struct p9_trans_fd *) client->trans;
1190 p->conn = p9_conn_create(client);
1191 if (IS_ERR(p->conn)) {
1192 err = PTR_ERR(p->conn);
1201 sock_release(csocket);
1208 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1211 struct p9_fd_opts opts;
1212 struct p9_trans_fd *p = NULL; /* this get allocated in p9_fd_open */
1214 parse_opts(args, &opts);
1216 if (opts.rfd == ~0 || opts.wfd == ~0) {
1217 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
1218 return -ENOPROTOOPT;
1221 err = p9_fd_open(client, opts.rfd, opts.wfd);
1225 p = (struct p9_trans_fd *) client->trans;
1226 p->conn = p9_conn_create(client);
1227 if (IS_ERR(p->conn)) {
1228 err = PTR_ERR(p->conn);
1240 static struct p9_trans_module p9_tcp_trans = {
1242 .maxsize = MAX_SOCK_BUF,
1244 .create = p9_fd_create_tcp,
1245 .close = p9_fd_close,
1247 .owner = THIS_MODULE,
1250 static struct p9_trans_module p9_unix_trans = {
1252 .maxsize = MAX_SOCK_BUF,
1254 .create = p9_fd_create_unix,
1255 .close = p9_fd_close,
1257 .owner = THIS_MODULE,
1260 static struct p9_trans_module p9_fd_trans = {
1262 .maxsize = MAX_SOCK_BUF,
1264 .create = p9_fd_create,
1265 .close = p9_fd_close,
1267 .owner = THIS_MODULE,
1271 * p9_poll_proc - poll worker thread
1272 * @a: thread state and arguments
1274 * polls all v9fs transports for new events and queues the appropriate
1275 * work to the work queue
1279 static int p9_poll_proc(void *a)
1281 unsigned long flags;
1283 P9_DPRINTK(P9_DEBUG_MUX, "start %p\n", current);
1285 spin_lock_irqsave(&p9_poll_lock, flags);
1286 while (!list_empty(&p9_poll_pending_list)) {
1287 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1290 list_del_init(&conn->poll_pending_link);
1291 spin_unlock_irqrestore(&p9_poll_lock, flags);
1295 spin_lock_irqsave(&p9_poll_lock, flags);
1297 spin_unlock_irqrestore(&p9_poll_lock, flags);
1299 set_current_state(TASK_INTERRUPTIBLE);
1300 if (list_empty(&p9_poll_pending_list)) {
1301 P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n");
1304 __set_current_state(TASK_RUNNING);
1306 if (!kthread_should_stop())
1309 P9_DPRINTK(P9_DEBUG_MUX, "finish\n");
1313 int p9_trans_fd_init(void)
1315 p9_mux_wq = create_workqueue("v9fs");
1317 printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n");
1321 p9_poll_task = kthread_run(p9_poll_proc, NULL, "v9fs-poll");
1322 if (IS_ERR(p9_poll_task)) {
1323 destroy_workqueue(p9_mux_wq);
1324 printk(KERN_WARNING "v9fs: mux: creating poll task failed\n");
1325 return PTR_ERR(p9_poll_task);
1328 v9fs_register_trans(&p9_tcp_trans);
1329 v9fs_register_trans(&p9_unix_trans);
1330 v9fs_register_trans(&p9_fd_trans);
1335 void p9_trans_fd_exit(void)
1337 kthread_stop(p9_poll_task);
1338 v9fs_unregister_trans(&p9_tcp_trans);
1339 v9fs_unregister_trans(&p9_unix_trans);
1340 v9fs_unregister_trans(&p9_fd_trans);
1342 destroy_workqueue(p9_mux_wq);