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)
48 #define MAXPOLLWADDR 2
51 * struct p9_fd_opts - per-transport options
52 * @rfd: file descriptor for reading (trans=fd)
53 * @wfd: file descriptor for writing (trans=fd)
54 * @port: port to connect to (trans=tcp)
65 * struct p9_trans_fd - transport state
66 * @rd: reference to file to read from
67 * @wr: reference of file to write to
68 * @conn: connection state reference
79 * Option Parsing (code inspired by NFS code)
80 * - a little lazy - parse all fd-transport options
84 /* Options that take integer arguments */
85 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
88 static const match_table_t tokens = {
89 {Opt_port, "port=%u"},
90 {Opt_rfdno, "rfdno=%u"},
91 {Opt_wfdno, "wfdno=%u"},
96 Rworksched = 1, /* read work scheduled or running */
97 Rpending = 2, /* can read */
98 Wworksched = 4, /* write work scheduled or running */
99 Wpending = 8, /* can write */
109 typedef void (*p9_conn_req_callback)(struct p9_req *req, void *a);
112 * struct p9_req - fd mux encoding of an rpc transaction
113 * @lock: protects req_list
114 * @tag: numeric tag for rpc transaction
115 * @tcall: request &p9_fcall structure
116 * @rcall: response &p9_fcall structure
118 * @cb: callback for when response is received
119 * @cba: argument to pass to callback
120 * @flush: flag to indicate RPC has been flushed
121 * @req_list: list link for higher level objects to chain requests
122 * @m: connection this request was issued on
123 * @wqueue: wait queue that client is blocked on for this rpc
130 struct p9_fcall *tcall;
131 struct p9_fcall *rcall;
133 p9_conn_req_callback cb;
136 struct list_head req_list;
138 wait_queue_head_t wqueue;
141 struct p9_poll_wait {
142 struct p9_conn *conn;
144 wait_queue_head_t *wait_addr;
148 * struct p9_conn - fd mux connection state information
149 * @lock: protects mux_list (?)
150 * @mux_list: list link for mux to manage multiple connections (?)
151 * @client: reference to client instance for this connection
152 * @tagpool: id accounting for transactions
154 * @req_list: accounting for requests which have been sent
155 * @unsent_req_list: accounting for requests that haven't been sent
156 * @rcall: current response &p9_fcall structure
157 * @rpos: read position in current frame
158 * @rbuf: current read buffer
159 * @wpos: write position for current frame
160 * @wsize: amount of data to write for current frame
161 * @wbuf: current write buffer
162 * @poll_wait: array of wait_q's for various worker threads
165 * @rq: current read work
166 * @wq: current write work
172 spinlock_t lock; /* protect lock structure */
173 struct list_head mux_list;
174 struct p9_client *client;
175 struct p9_idpool *tagpool;
177 struct list_head req_list;
178 struct list_head unsent_req_list;
179 struct p9_fcall *rcall;
185 struct list_head poll_pending_link;
186 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
188 struct work_struct rq;
189 struct work_struct wq;
190 unsigned long wsched;
193 static DEFINE_SPINLOCK(p9_poll_lock);
194 static LIST_HEAD(p9_poll_pending_list);
195 static struct workqueue_struct *p9_mux_wq;
196 static struct task_struct *p9_poll_task;
198 static u16 p9_mux_get_tag(struct p9_conn *m)
202 tag = p9_idpool_get(m->tagpool);
209 static void p9_mux_put_tag(struct p9_conn *m, u16 tag)
211 if (tag != P9_NOTAG && p9_idpool_check(tag, m->tagpool))
212 p9_idpool_put(tag, m->tagpool);
215 static void p9_mux_poll_stop(struct p9_conn *m)
220 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
221 struct p9_poll_wait *pwait = &m->poll_wait[i];
223 if (pwait->wait_addr) {
224 remove_wait_queue(pwait->wait_addr, &pwait->wait);
225 pwait->wait_addr = NULL;
229 spin_lock_irqsave(&p9_poll_lock, flags);
230 list_del_init(&m->poll_pending_link);
231 spin_unlock_irqrestore(&p9_poll_lock, flags);
235 * p9_conn_cancel - cancel all pending requests with error
241 void p9_conn_cancel(struct p9_conn *m, int err)
243 struct p9_req *req, *rtmp;
244 LIST_HEAD(cancel_list);
246 P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
249 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
250 list_move(&req->req_list, &cancel_list);
252 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
253 list_move(&req->req_list, &cancel_list);
255 spin_unlock(&m->lock);
257 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
258 list_del(&req->req_list);
263 (*req->cb) (req, req->cba);
269 static void process_request(struct p9_conn *m, struct p9_req *req)
272 struct p9_str *ename;
274 if (!req->err && req->rcall->id == P9_RERROR) {
275 ecode = req->rcall->params.rerror.errno;
276 ename = &req->rcall->params.rerror.error;
278 P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len,
285 req->err = p9_errstr2errno(ename->str, ename->len);
287 /* string match failed */
289 PRINT_FCALL_ERROR("unknown error", req->rcall);
290 req->err = -ESERVERFAULT;
293 } else if (req->tcall && req->rcall->id != req->tcall->id + 1) {
294 P9_DPRINTK(P9_DEBUG_ERROR,
295 "fcall mismatch: expected %d, got %d\n",
296 req->tcall->id + 1, req->rcall->id);
303 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
306 struct p9_trans_fd *ts = NULL;
308 if (client && client->status == Connected)
314 if (!ts->rd->f_op || !ts->rd->f_op->poll)
317 if (!ts->wr->f_op || !ts->wr->f_op->poll)
320 ret = ts->rd->f_op->poll(ts->rd, pt);
324 if (ts->rd != ts->wr) {
325 n = ts->wr->f_op->poll(ts->wr, pt);
328 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
335 * p9_fd_read- read from a fd
336 * @client: client instance
337 * @v: buffer to receive data into
338 * @len: size of receive buffer
342 static int p9_fd_read(struct p9_client *client, void *v, int len)
345 struct p9_trans_fd *ts = NULL;
347 if (client && client->status != Disconnected)
353 if (!(ts->rd->f_flags & O_NONBLOCK))
354 P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
356 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
357 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
358 client->status = Disconnected;
363 * p9_read_work - called when there is some data to be read from a transport
364 * @work: container of work to be done
368 static void p9_read_work(struct work_struct *work)
372 struct p9_req *req, *rptr, *rreq;
373 struct p9_fcall *rcall;
376 m = container_of(work, struct p9_conn, rq);
382 P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
386 kmalloc(sizeof(struct p9_fcall) + m->client->msize,
393 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
397 clear_bit(Rpending, &m->wsched);
398 err = p9_fd_read(m->client, m->rbuf + m->rpos,
399 m->client->msize - m->rpos);
400 P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err);
401 if (err == -EAGAIN) {
402 clear_bit(Rworksched, &m->wsched);
410 while (m->rpos > 4) {
411 n = le32_to_cpu(*(__le32 *) m->rbuf);
412 if (n >= m->client->msize) {
413 P9_DPRINTK(P9_DEBUG_ERROR,
414 "requested packet size too big: %d\n", n);
423 p9_deserialize_fcall(m->rbuf, n, m->rcall, m->client->dotu);
427 #ifdef CONFIG_NET_9P_DEBUG
428 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
431 p9_printfcall(buf, sizeof(buf), m->rcall,
433 printk(KERN_NOTICE ">>> %p %s\n", m, buf);
440 m->rcall = kmalloc(sizeof(struct p9_fcall) +
441 m->client->msize, GFP_KERNEL);
447 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
448 memmove(m->rbuf, rbuf + n, m->rpos - n);
456 P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m,
457 rcall->id, rcall->tag);
461 list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
462 if (rreq->tag == rcall->tag) {
464 if (req->flush != Flushing)
465 list_del(&req->req_list);
469 spin_unlock(&m->lock);
473 process_request(m, req);
475 if (req->flush != Flushing) {
477 (*req->cb) (req, req->cba);
482 if (err >= 0 && rcall->id != P9_RFLUSH)
483 P9_DPRINTK(P9_DEBUG_ERROR,
484 "unexpected response mux %p id %d tag %d\n",
485 m, rcall->id, rcall->tag);
490 if (!list_empty(&m->req_list)) {
491 if (test_and_clear_bit(Rpending, &m->wsched))
494 n = p9_fd_poll(m->client, NULL);
497 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
498 queue_work(p9_mux_wq, &m->rq);
500 clear_bit(Rworksched, &m->wsched);
502 clear_bit(Rworksched, &m->wsched);
507 p9_conn_cancel(m, err);
508 clear_bit(Rworksched, &m->wsched);
512 * p9_fd_write - write to a socket
513 * @client: client instance
514 * @v: buffer to send data from
515 * @len: size of send buffer
519 static int p9_fd_write(struct p9_client *client, void *v, int len)
523 struct p9_trans_fd *ts = NULL;
525 if (client && client->status != Disconnected)
531 if (!(ts->wr->f_flags & O_NONBLOCK))
532 P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
536 /* The cast to a user pointer is valid due to the set_fs() */
537 ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos);
540 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
541 client->status = Disconnected;
546 * p9_write_work - called when a transport can send some data
547 * @work: container for work to be done
551 static void p9_write_work(struct work_struct *work)
557 m = container_of(work, struct p9_conn, wq);
560 clear_bit(Wworksched, &m->wsched);
565 if (list_empty(&m->unsent_req_list)) {
566 clear_bit(Wworksched, &m->wsched);
572 req = list_entry(m->unsent_req_list.next, struct p9_req,
574 list_move_tail(&req->req_list, &m->req_list);
575 if (req->err == ERREQFLUSH)
578 m->wbuf = req->tcall->sdata;
579 m->wsize = req->tcall->size;
581 spin_unlock(&m->lock);
584 P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos,
586 clear_bit(Wpending, &m->wsched);
587 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
588 P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err);
589 if (err == -EAGAIN) {
590 clear_bit(Wworksched, &m->wsched);
602 if (m->wpos == m->wsize)
603 m->wpos = m->wsize = 0;
605 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
606 if (test_and_clear_bit(Wpending, &m->wsched))
609 n = p9_fd_poll(m->client, NULL);
612 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
613 queue_work(p9_mux_wq, &m->wq);
615 clear_bit(Wworksched, &m->wsched);
617 clear_bit(Wworksched, &m->wsched);
622 p9_conn_cancel(m, err);
623 clear_bit(Wworksched, &m->wsched);
626 static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key)
628 struct p9_poll_wait *pwait =
629 container_of(wait, struct p9_poll_wait, wait);
630 struct p9_conn *m = pwait->conn;
632 DECLARE_WAITQUEUE(dummy_wait, p9_poll_task);
634 spin_lock_irqsave(&p9_poll_lock, flags);
635 if (list_empty(&m->poll_pending_link))
636 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
637 spin_unlock_irqrestore(&p9_poll_lock, flags);
639 /* perform the default wake up operation */
640 return default_wake_function(&dummy_wait, mode, sync, key);
644 * p9_pollwait - add poll task to the wait queue
645 * @filp: file pointer being polled
646 * @wait_address: wait_q to block on
649 * called by files poll operation to add v9fs-poll task to files wait queue
653 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
655 struct p9_conn *m = container_of(p, struct p9_conn, pt);
656 struct p9_poll_wait *pwait = NULL;
659 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
660 if (m->poll_wait[i].wait_addr == NULL) {
661 pwait = &m->poll_wait[i];
667 P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
672 P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n");
673 pwait->wait_addr = ERR_PTR(-EIO);
678 pwait->wait_addr = wait_address;
679 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
680 add_wait_queue(wait_address, &pwait->wait);
684 * p9_conn_create - allocate and initialize the per-session mux data
685 * @client: client instance
687 * Note: Creates the polling task if this is the first session.
690 static struct p9_conn *p9_conn_create(struct p9_client *client)
695 P9_DPRINTK(P9_DEBUG_MUX, "client %p msize %d\n", client, client->msize);
696 m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
698 return ERR_PTR(-ENOMEM);
700 spin_lock_init(&m->lock);
701 INIT_LIST_HEAD(&m->mux_list);
703 m->tagpool = p9_idpool_create();
704 if (IS_ERR(m->tagpool)) {
706 return ERR_PTR(-ENOMEM);
709 INIT_LIST_HEAD(&m->req_list);
710 INIT_LIST_HEAD(&m->unsent_req_list);
711 INIT_WORK(&m->rq, p9_read_work);
712 INIT_WORK(&m->wq, p9_write_work);
713 INIT_LIST_HEAD(&m->poll_pending_link);
714 init_poll_funcptr(&m->pt, p9_pollwait);
716 n = p9_fd_poll(client, &m->pt);
718 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
719 set_bit(Rpending, &m->wsched);
723 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
724 set_bit(Wpending, &m->wsched);
727 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
728 if (IS_ERR(m->poll_wait[i].wait_addr)) {
731 /* return the error code */
732 return (void *)m->poll_wait[i].wait_addr;
740 * p9_poll_mux - polls a mux and schedules read or write works if necessary
741 * @m: connection to poll
745 static void p9_poll_mux(struct p9_conn *m)
752 n = p9_fd_poll(m->client, NULL);
753 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
754 P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n);
757 p9_conn_cancel(m, n);
761 set_bit(Rpending, &m->wsched);
762 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
763 if (!test_and_set_bit(Rworksched, &m->wsched)) {
764 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
765 queue_work(p9_mux_wq, &m->rq);
770 set_bit(Wpending, &m->wsched);
771 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
772 if ((m->wsize || !list_empty(&m->unsent_req_list))
773 && !test_and_set_bit(Wworksched, &m->wsched)) {
774 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
775 queue_work(p9_mux_wq, &m->wq);
781 * p9_send_request - send 9P request
782 * The function can sleep until the request is scheduled for sending.
783 * The function can be interrupted. Return from the function is not
784 * a guarantee that the request is sent successfully. Can return errors
785 * that can be retrieved by PTR_ERR macros.
788 * @tc: request to be sent
789 * @cb: callback function to call when response is received
790 * @cba: parameter to pass to the callback function
794 static struct p9_req *p9_send_request(struct p9_conn *m,
796 p9_conn_req_callback cb, void *cba)
801 P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current,
804 return ERR_PTR(m->err);
806 req = kmalloc(sizeof(struct p9_req), GFP_KERNEL);
808 return ERR_PTR(-ENOMEM);
810 if (tc->id == P9_TVERSION)
813 n = p9_mux_get_tag(m);
817 return ERR_PTR(-ENOMEM);
822 #ifdef CONFIG_NET_9P_DEBUG
823 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
826 p9_printfcall(buf, sizeof(buf), tc, m->client->dotu);
827 printk(KERN_NOTICE "<<< %p %s\n", m, buf);
831 spin_lock_init(&req->lock);
833 init_waitqueue_head(&req->wqueue);
843 list_add_tail(&req->req_list, &m->unsent_req_list);
844 spin_unlock(&m->lock);
846 if (test_and_clear_bit(Wpending, &m->wsched))
849 n = p9_fd_poll(m->client, NULL);
851 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
852 queue_work(p9_mux_wq, &m->wq);
857 static void p9_mux_free_request(struct p9_conn *m, struct p9_req *req)
859 p9_mux_put_tag(m, req->tag);
863 static void p9_mux_flush_cb(struct p9_req *freq, void *a)
867 struct p9_req *req, *rreq, *rptr;
870 P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m,
871 freq->tcall, freq->rcall, freq->err,
872 freq->tcall->params.tflush.oldtag);
875 tag = freq->tcall->params.tflush.oldtag;
877 list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
878 if (rreq->tag == tag) {
880 list_del(&req->req_list);
884 spin_unlock(&m->lock);
887 spin_lock(&req->lock);
888 req->flush = Flushed;
889 spin_unlock(&req->lock);
892 (*req->cb) (req, req->cba);
899 p9_mux_free_request(m, freq);
903 p9_mux_flush_request(struct p9_conn *m, struct p9_req *req)
906 struct p9_req *rreq, *rptr;
908 P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag);
910 /* if a response was received for a request, do nothing */
911 spin_lock(&req->lock);
912 if (req->rcall || req->err) {
913 spin_unlock(&req->lock);
914 P9_DPRINTK(P9_DEBUG_MUX,
915 "mux %p req %p response already received\n", m, req);
919 req->flush = Flushing;
920 spin_unlock(&req->lock);
923 /* if the request is not sent yet, just remove it from the list */
924 list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) {
925 if (rreq->tag == req->tag) {
926 P9_DPRINTK(P9_DEBUG_MUX,
927 "mux %p req %p request is not sent yet\n", m, req);
928 list_del(&rreq->req_list);
929 req->flush = Flushed;
930 spin_unlock(&m->lock);
932 (*req->cb) (req, req->cba);
936 spin_unlock(&m->lock);
938 clear_thread_flag(TIF_SIGPENDING);
939 fc = p9_create_tflush(req->tag);
940 p9_send_request(m, fc, p9_mux_flush_cb, m);
944 static void p9_conn_rpc_cb(struct p9_req *req, void *a)
946 P9_DPRINTK(P9_DEBUG_MUX, "req %p arg %p\n", req, a);
948 if (req->flush != None && !req->err)
949 req->err = -ERESTARTSYS;
951 wake_up(&req->wqueue);
955 * p9_fd_rpc- sends 9P request and waits until a response is available.
956 * The function can be interrupted.
957 * @client: client instance
958 * @tc: request to be sent
959 * @rc: pointer where a pointer to the response is stored
964 p9_fd_rpc(struct p9_client *client, struct p9_fcall *tc, struct p9_fcall **rc)
966 struct p9_trans_fd *p = client->trans;
967 struct p9_conn *m = p->conn;
976 if (signal_pending(current)) {
978 clear_thread_flag(TIF_SIGPENDING);
981 req = p9_send_request(m, tc, p9_conn_rpc_cb, NULL);
984 P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err);
988 err = wait_event_interruptible(req->wqueue, req->rcall != NULL ||
993 if (err == -ERESTARTSYS && client->status == Connected
995 if (p9_mux_flush_request(m, req)) {
996 /* wait until we get response of the flush message */
998 clear_thread_flag(TIF_SIGPENDING);
999 err = wait_event_interruptible(req->wqueue,
1000 req->rcall || req->err);
1001 } while (!req->rcall && !req->err &&
1002 err == -ERESTARTSYS &&
1003 client->status == Connected && !m->err);
1011 spin_lock_irqsave(¤t->sighand->siglock, flags);
1012 recalc_sigpending();
1013 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
1021 p9_mux_free_request(m, req);
1029 * parse_options - parse mount options into session structure
1030 * @options: options string passed from mount
1031 * @opts: transport-specific structure to parse options into
1033 * Returns 0 upon success, -ERRNO upon failure
1036 static int parse_opts(char *params, struct p9_fd_opts *opts)
1039 substring_t args[MAX_OPT_ARGS];
1044 opts->port = P9_PORT;
1051 options = kstrdup(params, GFP_KERNEL);
1053 P9_DPRINTK(P9_DEBUG_ERROR,
1054 "failed to allocate copy of option string\n");
1058 while ((p = strsep(&options, ",")) != NULL) {
1063 token = match_token(p, tokens, args);
1064 r = match_int(&args[0], &option);
1066 P9_DPRINTK(P9_DEBUG_ERROR,
1067 "integer field, but no integer?\n");
1073 opts->port = option;
1089 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
1091 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
1098 if (!ts->rd || !ts->wr) {
1108 client->status = Connected;
1113 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
1117 csocket->sk->sk_allocation = GFP_NOIO;
1118 fd = sock_map_fd(csocket, 0);
1120 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
1124 ret = p9_fd_open(client, fd, fd);
1126 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n");
1127 sockfd_put(csocket);
1131 ((struct p9_trans_fd *)client->trans)->rd->f_flags |= O_NONBLOCK;
1137 * p9_mux_destroy - cancels all pending requests and frees mux resources
1138 * @m: mux to destroy
1142 static void p9_conn_destroy(struct p9_conn *m)
1144 P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m,
1145 m->mux_list.prev, m->mux_list.next);
1147 p9_mux_poll_stop(m);
1148 cancel_work_sync(&m->rq);
1149 cancel_work_sync(&m->wq);
1151 p9_conn_cancel(m, -ECONNRESET);
1154 p9_idpool_destroy(m->tagpool);
1159 * p9_fd_close - shutdown file descriptor transport
1160 * @client: client instance
1164 static void p9_fd_close(struct p9_client *client)
1166 struct p9_trans_fd *ts;
1175 client->status = Disconnected;
1177 p9_conn_destroy(ts->conn);
1188 * stolen from NFS - maybe should be made a generic function?
1190 static inline int valid_ipaddr4(const char *buf)
1192 int rc, count, in[4];
1194 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
1197 for (count = 0; count < 4; count++) {
1198 if (in[count] > 255)
1205 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
1208 struct socket *csocket;
1209 struct sockaddr_in sin_server;
1210 struct p9_fd_opts opts;
1211 struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
1213 err = parse_opts(args, &opts);
1217 if (valid_ipaddr4(addr) < 0)
1222 sin_server.sin_family = AF_INET;
1223 sin_server.sin_addr.s_addr = in_aton(addr);
1224 sin_server.sin_port = htons(opts.port);
1225 sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
1228 P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n");
1233 err = csocket->ops->connect(csocket,
1234 (struct sockaddr *)&sin_server,
1235 sizeof(struct sockaddr_in), 0);
1237 P9_EPRINTK(KERN_ERR,
1238 "p9_trans_tcp: problem connecting socket to %s\n",
1243 err = p9_socket_open(client, csocket);
1247 p = (struct p9_trans_fd *) client->trans;
1248 p->conn = p9_conn_create(client);
1249 if (IS_ERR(p->conn)) {
1250 err = PTR_ERR(p->conn);
1259 sock_release(csocket);
1267 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
1270 struct socket *csocket;
1271 struct sockaddr_un sun_server;
1272 struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
1276 if (strlen(addr) > UNIX_PATH_MAX) {
1277 P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
1279 err = -ENAMETOOLONG;
1283 sun_server.sun_family = PF_UNIX;
1284 strcpy(sun_server.sun_path, addr);
1285 sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
1286 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1287 sizeof(struct sockaddr_un) - 1, 0);
1289 P9_EPRINTK(KERN_ERR,
1290 "p9_trans_unix: problem connecting socket: %s: %d\n",
1295 err = p9_socket_open(client, csocket);
1299 p = (struct p9_trans_fd *) client->trans;
1300 p->conn = p9_conn_create(client);
1301 if (IS_ERR(p->conn)) {
1302 err = PTR_ERR(p->conn);
1311 sock_release(csocket);
1318 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1321 struct p9_fd_opts opts;
1322 struct p9_trans_fd *p = NULL; /* this get allocated in p9_fd_open */
1324 parse_opts(args, &opts);
1326 if (opts.rfd == ~0 || opts.wfd == ~0) {
1327 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
1328 return -ENOPROTOOPT;
1331 err = p9_fd_open(client, opts.rfd, opts.wfd);
1335 p = (struct p9_trans_fd *) client->trans;
1336 p->conn = p9_conn_create(client);
1337 if (IS_ERR(p->conn)) {
1338 err = PTR_ERR(p->conn);
1350 static struct p9_trans_module p9_tcp_trans = {
1352 .maxsize = MAX_SOCK_BUF,
1354 .create = p9_fd_create_tcp,
1355 .close = p9_fd_close,
1357 .owner = THIS_MODULE,
1360 static struct p9_trans_module p9_unix_trans = {
1362 .maxsize = MAX_SOCK_BUF,
1364 .create = p9_fd_create_unix,
1365 .close = p9_fd_close,
1367 .owner = THIS_MODULE,
1370 static struct p9_trans_module p9_fd_trans = {
1372 .maxsize = MAX_SOCK_BUF,
1374 .create = p9_fd_create,
1375 .close = p9_fd_close,
1377 .owner = THIS_MODULE,
1381 * p9_poll_proc - poll worker thread
1382 * @a: thread state and arguments
1384 * polls all v9fs transports for new events and queues the appropriate
1385 * work to the work queue
1389 static int p9_poll_proc(void *a)
1391 unsigned long flags;
1393 P9_DPRINTK(P9_DEBUG_MUX, "start %p\n", current);
1395 spin_lock_irqsave(&p9_poll_lock, flags);
1396 while (!list_empty(&p9_poll_pending_list)) {
1397 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1400 list_del_init(&conn->poll_pending_link);
1401 spin_unlock_irqrestore(&p9_poll_lock, flags);
1405 spin_lock_irqsave(&p9_poll_lock, flags);
1407 spin_unlock_irqrestore(&p9_poll_lock, flags);
1409 set_current_state(TASK_INTERRUPTIBLE);
1410 if (list_empty(&p9_poll_pending_list)) {
1411 P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n");
1414 __set_current_state(TASK_RUNNING);
1416 if (!kthread_should_stop())
1419 P9_DPRINTK(P9_DEBUG_MUX, "finish\n");
1423 int p9_trans_fd_init(void)
1425 p9_mux_wq = create_workqueue("v9fs");
1427 printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n");
1431 p9_poll_task = kthread_run(p9_poll_proc, NULL, "v9fs-poll");
1432 if (IS_ERR(p9_poll_task)) {
1433 destroy_workqueue(p9_mux_wq);
1434 printk(KERN_WARNING "v9fs: mux: creating poll task failed\n");
1435 return PTR_ERR(p9_poll_task);
1438 v9fs_register_trans(&p9_tcp_trans);
1439 v9fs_register_trans(&p9_unix_trans);
1440 v9fs_register_trans(&p9_fd_trans);
1445 void p9_trans_fd_exit(void)
1447 kthread_stop(p9_poll_task);
1448 v9fs_unregister_trans(&p9_tcp_trans);
1449 v9fs_unregister_trans(&p9_unix_trans);
1450 v9fs_unregister_trans(&p9_fd_trans);
1452 destroy_workqueue(p9_mux_wq);