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 * struct p9_req - fd mux encoding of an rpc transaction
110 * @lock: protects req_list
111 * @tag: numeric tag for rpc transaction
112 * @tcall: request &p9_fcall structure
113 * @rcall: response &p9_fcall structure
115 * @flush: flag to indicate RPC has been flushed
116 * @req_list: list link for higher level objects to chain requests
117 * @m: connection this request was issued on
118 * @wqueue: wait queue that client is blocked on for this rpc
125 struct p9_fcall *tcall;
126 struct p9_fcall *rcall;
129 struct list_head req_list;
131 wait_queue_head_t wqueue;
134 struct p9_poll_wait {
135 struct p9_conn *conn;
137 wait_queue_head_t *wait_addr;
141 * struct p9_conn - fd mux connection state information
142 * @lock: protects mux_list (?)
143 * @mux_list: list link for mux to manage multiple connections (?)
144 * @client: reference to client instance for this connection
146 * @req_list: accounting for requests which have been sent
147 * @unsent_req_list: accounting for requests that haven't been sent
148 * @rcall: current response &p9_fcall structure
149 * @rpos: read position in current frame
150 * @rbuf: current read buffer
151 * @wpos: write position for current frame
152 * @wsize: amount of data to write for current frame
153 * @wbuf: current write buffer
154 * @poll_wait: array of wait_q's for various worker threads
157 * @rq: current read work
158 * @wq: current write work
164 spinlock_t lock; /* protect lock structure */
165 struct list_head mux_list;
166 struct p9_client *client;
168 struct list_head req_list;
169 struct list_head unsent_req_list;
170 struct p9_fcall *rcall;
176 struct list_head poll_pending_link;
177 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
179 struct work_struct rq;
180 struct work_struct wq;
181 unsigned long wsched;
184 static DEFINE_SPINLOCK(p9_poll_lock);
185 static LIST_HEAD(p9_poll_pending_list);
186 static struct workqueue_struct *p9_mux_wq;
187 static struct task_struct *p9_poll_task;
189 static void p9_mux_poll_stop(struct p9_conn *m)
194 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
195 struct p9_poll_wait *pwait = &m->poll_wait[i];
197 if (pwait->wait_addr) {
198 remove_wait_queue(pwait->wait_addr, &pwait->wait);
199 pwait->wait_addr = NULL;
203 spin_lock_irqsave(&p9_poll_lock, flags);
204 list_del_init(&m->poll_pending_link);
205 spin_unlock_irqrestore(&p9_poll_lock, flags);
208 static void p9_mux_free_request(struct p9_conn *m, struct p9_req *req)
210 if (req->tag != P9_NOTAG &&
211 p9_idpool_check(req->tag, m->client->tagpool))
212 p9_idpool_put(req->tag, m->client->tagpool);
216 static void p9_conn_rpc_cb(struct p9_req *req);
218 static void p9_mux_flush_cb(struct p9_req *freq)
221 struct p9_conn *m = freq->m;
222 struct p9_req *req, *rreq, *rptr;
224 P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m,
225 freq->tcall, freq->rcall, freq->err,
226 freq->tcall->params.tflush.oldtag);
229 tag = freq->tcall->params.tflush.oldtag;
231 list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
232 if (rreq->tag == tag) {
234 list_del(&req->req_list);
238 spin_unlock(&m->lock);
241 spin_lock(&req->lock);
242 req->flush = Flushed;
243 spin_unlock(&req->lock);
250 p9_mux_free_request(m, freq);
253 static void p9_conn_rpc_cb(struct p9_req *req)
255 P9_DPRINTK(P9_DEBUG_MUX, "req %p\n", req);
257 if (req->tcall->id == P9_TFLUSH) { /* flush callback */
258 P9_DPRINTK(P9_DEBUG_MUX, "flush req %p\n", req);
259 p9_mux_flush_cb(req);
260 } else { /* normal wakeup path */
261 P9_DPRINTK(P9_DEBUG_MUX, "normal req %p\n", req);
262 if (req->flush != None && !req->err)
263 req->err = -ERESTARTSYS;
265 wake_up(&req->wqueue);
270 * p9_conn_cancel - cancel all pending requests with error
276 void p9_conn_cancel(struct p9_conn *m, int err)
278 struct p9_req *req, *rtmp;
279 LIST_HEAD(cancel_list);
281 P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
284 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
285 list_move(&req->req_list, &cancel_list);
287 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
288 list_move(&req->req_list, &cancel_list);
290 spin_unlock(&m->lock);
292 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
293 list_del(&req->req_list);
301 static void process_request(struct p9_conn *m, struct p9_req *req)
304 struct p9_str *ename;
306 if (!req->err && req->rcall->id == P9_RERROR) {
307 ecode = req->rcall->params.rerror.errno;
308 ename = &req->rcall->params.rerror.error;
310 P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len,
317 req->err = p9_errstr2errno(ename->str, ename->len);
319 /* string match failed */
321 PRINT_FCALL_ERROR("unknown error", req->rcall);
322 req->err = -ESERVERFAULT;
325 } else if (req->tcall && req->rcall->id != req->tcall->id + 1) {
326 P9_DPRINTK(P9_DEBUG_ERROR,
327 "fcall mismatch: expected %d, got %d\n",
328 req->tcall->id + 1, req->rcall->id);
335 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
338 struct p9_trans_fd *ts = NULL;
340 if (client && client->status == Connected)
346 if (!ts->rd->f_op || !ts->rd->f_op->poll)
349 if (!ts->wr->f_op || !ts->wr->f_op->poll)
352 ret = ts->rd->f_op->poll(ts->rd, pt);
356 if (ts->rd != ts->wr) {
357 n = ts->wr->f_op->poll(ts->wr, pt);
360 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
367 * p9_fd_read- read from a fd
368 * @client: client instance
369 * @v: buffer to receive data into
370 * @len: size of receive buffer
374 static int p9_fd_read(struct p9_client *client, void *v, int len)
377 struct p9_trans_fd *ts = NULL;
379 if (client && client->status != Disconnected)
385 if (!(ts->rd->f_flags & O_NONBLOCK))
386 P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
388 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
389 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
390 client->status = Disconnected;
395 * p9_read_work - called when there is some data to be read from a transport
396 * @work: container of work to be done
400 static void p9_read_work(struct work_struct *work)
404 struct p9_req *req, *rptr, *rreq;
405 struct p9_fcall *rcall;
408 m = container_of(work, struct p9_conn, rq);
414 P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
418 kmalloc(sizeof(struct p9_fcall) + m->client->msize,
425 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
429 clear_bit(Rpending, &m->wsched);
430 err = p9_fd_read(m->client, m->rbuf + m->rpos,
431 m->client->msize - m->rpos);
432 P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err);
433 if (err == -EAGAIN) {
434 clear_bit(Rworksched, &m->wsched);
442 while (m->rpos > 4) {
443 n = le32_to_cpu(*(__le32 *) m->rbuf);
444 if (n >= m->client->msize) {
445 P9_DPRINTK(P9_DEBUG_ERROR,
446 "requested packet size too big: %d\n", n);
455 p9_deserialize_fcall(m->rbuf, n, m->rcall, m->client->dotu);
459 #ifdef CONFIG_NET_9P_DEBUG
460 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
463 p9_printfcall(buf, sizeof(buf), m->rcall,
465 printk(KERN_NOTICE ">>> %p %s\n", m, buf);
472 m->rcall = kmalloc(sizeof(struct p9_fcall) +
473 m->client->msize, GFP_KERNEL);
479 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
480 memmove(m->rbuf, rbuf + n, m->rpos - n);
488 P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m,
489 rcall->id, rcall->tag);
493 list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
494 if (rreq->tag == rcall->tag) {
496 if (req->flush != Flushing)
497 list_del(&req->req_list);
501 spin_unlock(&m->lock);
505 process_request(m, req);
507 if (req->flush != Flushing)
510 if (err >= 0 && rcall->id != P9_RFLUSH)
511 P9_DPRINTK(P9_DEBUG_ERROR,
512 "unexpected response mux %p id %d tag %d\n",
513 m, rcall->id, rcall->tag);
518 if (!list_empty(&m->req_list)) {
519 if (test_and_clear_bit(Rpending, &m->wsched))
522 n = p9_fd_poll(m->client, NULL);
525 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
526 queue_work(p9_mux_wq, &m->rq);
528 clear_bit(Rworksched, &m->wsched);
530 clear_bit(Rworksched, &m->wsched);
535 p9_conn_cancel(m, err);
536 clear_bit(Rworksched, &m->wsched);
540 * p9_fd_write - write to a socket
541 * @client: client instance
542 * @v: buffer to send data from
543 * @len: size of send buffer
547 static int p9_fd_write(struct p9_client *client, void *v, int len)
551 struct p9_trans_fd *ts = NULL;
553 if (client && client->status != Disconnected)
559 if (!(ts->wr->f_flags & O_NONBLOCK))
560 P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
564 /* The cast to a user pointer is valid due to the set_fs() */
565 ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos);
568 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
569 client->status = Disconnected;
574 * p9_write_work - called when a transport can send some data
575 * @work: container for work to be done
579 static void p9_write_work(struct work_struct *work)
585 m = container_of(work, struct p9_conn, wq);
588 clear_bit(Wworksched, &m->wsched);
593 if (list_empty(&m->unsent_req_list)) {
594 clear_bit(Wworksched, &m->wsched);
600 req = list_entry(m->unsent_req_list.next, struct p9_req,
602 list_move_tail(&req->req_list, &m->req_list);
603 if (req->err == ERREQFLUSH)
606 m->wbuf = req->tcall->sdata;
607 m->wsize = req->tcall->size;
609 spin_unlock(&m->lock);
612 P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos,
614 clear_bit(Wpending, &m->wsched);
615 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
616 P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err);
617 if (err == -EAGAIN) {
618 clear_bit(Wworksched, &m->wsched);
630 if (m->wpos == m->wsize)
631 m->wpos = m->wsize = 0;
633 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
634 if (test_and_clear_bit(Wpending, &m->wsched))
637 n = p9_fd_poll(m->client, NULL);
640 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
641 queue_work(p9_mux_wq, &m->wq);
643 clear_bit(Wworksched, &m->wsched);
645 clear_bit(Wworksched, &m->wsched);
650 p9_conn_cancel(m, err);
651 clear_bit(Wworksched, &m->wsched);
654 static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key)
656 struct p9_poll_wait *pwait =
657 container_of(wait, struct p9_poll_wait, wait);
658 struct p9_conn *m = pwait->conn;
660 DECLARE_WAITQUEUE(dummy_wait, p9_poll_task);
662 spin_lock_irqsave(&p9_poll_lock, flags);
663 if (list_empty(&m->poll_pending_link))
664 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
665 spin_unlock_irqrestore(&p9_poll_lock, flags);
667 /* perform the default wake up operation */
668 return default_wake_function(&dummy_wait, mode, sync, key);
672 * p9_pollwait - add poll task to the wait queue
673 * @filp: file pointer being polled
674 * @wait_address: wait_q to block on
677 * called by files poll operation to add v9fs-poll task to files wait queue
681 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
683 struct p9_conn *m = container_of(p, struct p9_conn, pt);
684 struct p9_poll_wait *pwait = NULL;
687 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
688 if (m->poll_wait[i].wait_addr == NULL) {
689 pwait = &m->poll_wait[i];
695 P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
700 P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n");
701 pwait->wait_addr = ERR_PTR(-EIO);
706 pwait->wait_addr = wait_address;
707 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
708 add_wait_queue(wait_address, &pwait->wait);
712 * p9_conn_create - allocate and initialize the per-session mux data
713 * @client: client instance
715 * Note: Creates the polling task if this is the first session.
718 static struct p9_conn *p9_conn_create(struct p9_client *client)
723 P9_DPRINTK(P9_DEBUG_MUX, "client %p msize %d\n", client, client->msize);
724 m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
726 return ERR_PTR(-ENOMEM);
728 spin_lock_init(&m->lock);
729 INIT_LIST_HEAD(&m->mux_list);
732 INIT_LIST_HEAD(&m->req_list);
733 INIT_LIST_HEAD(&m->unsent_req_list);
734 INIT_WORK(&m->rq, p9_read_work);
735 INIT_WORK(&m->wq, p9_write_work);
736 INIT_LIST_HEAD(&m->poll_pending_link);
737 init_poll_funcptr(&m->pt, p9_pollwait);
739 n = p9_fd_poll(client, &m->pt);
741 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
742 set_bit(Rpending, &m->wsched);
746 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
747 set_bit(Wpending, &m->wsched);
750 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
751 if (IS_ERR(m->poll_wait[i].wait_addr)) {
754 /* return the error code */
755 return (void *)m->poll_wait[i].wait_addr;
763 * p9_poll_mux - polls a mux and schedules read or write works if necessary
764 * @m: connection to poll
768 static void p9_poll_mux(struct p9_conn *m)
775 n = p9_fd_poll(m->client, NULL);
776 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
777 P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n);
780 p9_conn_cancel(m, n);
784 set_bit(Rpending, &m->wsched);
785 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
786 if (!test_and_set_bit(Rworksched, &m->wsched)) {
787 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
788 queue_work(p9_mux_wq, &m->rq);
793 set_bit(Wpending, &m->wsched);
794 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
795 if ((m->wsize || !list_empty(&m->unsent_req_list))
796 && !test_and_set_bit(Wworksched, &m->wsched)) {
797 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
798 queue_work(p9_mux_wq, &m->wq);
804 * p9_send_request - send 9P request
805 * The function can sleep until the request is scheduled for sending.
806 * The function can be interrupted. Return from the function is not
807 * a guarantee that the request is sent successfully. Can return errors
808 * that can be retrieved by PTR_ERR macros.
811 * @tc: request to be sent
815 static struct p9_req *p9_send_request(struct p9_conn *m, struct p9_fcall *tc)
820 P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current,
823 return ERR_PTR(m->err);
825 req = kmalloc(sizeof(struct p9_req), GFP_KERNEL);
827 return ERR_PTR(-ENOMEM);
830 if (tc->id != P9_TVERSION) {
831 n = p9_idpool_get(m->client->tagpool);
834 return ERR_PTR(-ENOMEM);
840 #ifdef CONFIG_NET_9P_DEBUG
841 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
844 p9_printfcall(buf, sizeof(buf), tc, m->client->dotu);
845 printk(KERN_NOTICE "<<< %p %s\n", m, buf);
849 spin_lock_init(&req->lock);
851 init_waitqueue_head(&req->wqueue);
859 list_add_tail(&req->req_list, &m->unsent_req_list);
860 spin_unlock(&m->lock);
862 if (test_and_clear_bit(Wpending, &m->wsched))
865 n = p9_fd_poll(m->client, NULL);
867 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
868 queue_work(p9_mux_wq, &m->wq);
874 p9_mux_flush_request(struct p9_conn *m, struct p9_req *req)
877 struct p9_req *rreq, *rptr;
879 P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag);
881 /* if a response was received for a request, do nothing */
882 spin_lock(&req->lock);
883 if (req->rcall || req->err) {
884 spin_unlock(&req->lock);
885 P9_DPRINTK(P9_DEBUG_MUX,
886 "mux %p req %p response already received\n", m, req);
890 req->flush = Flushing;
891 spin_unlock(&req->lock);
894 /* if the request is not sent yet, just remove it from the list */
895 list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) {
896 if (rreq->tag == req->tag) {
897 P9_DPRINTK(P9_DEBUG_MUX,
898 "mux %p req %p request is not sent yet\n", m, req);
899 list_del(&rreq->req_list);
900 req->flush = Flushed;
901 spin_unlock(&m->lock);
906 spin_unlock(&m->lock);
908 clear_thread_flag(TIF_SIGPENDING);
909 fc = p9_create_tflush(req->tag);
910 p9_send_request(m, fc);
915 * p9_fd_rpc- sends 9P request and waits until a response is available.
916 * The function can be interrupted.
917 * @client: client instance
918 * @tc: request to be sent
919 * @rc: pointer where a pointer to the response is stored
924 p9_fd_rpc(struct p9_client *client, struct p9_fcall *tc, struct p9_fcall **rc)
926 struct p9_trans_fd *p = client->trans;
927 struct p9_conn *m = p->conn;
936 if (signal_pending(current)) {
938 clear_thread_flag(TIF_SIGPENDING);
941 req = p9_send_request(m, tc);
944 P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err);
948 err = wait_event_interruptible(req->wqueue, req->rcall != NULL ||
953 if (err == -ERESTARTSYS && client->status == Connected
955 if (p9_mux_flush_request(m, req)) {
956 /* wait until we get response of the flush message */
958 clear_thread_flag(TIF_SIGPENDING);
959 err = wait_event_interruptible(req->wqueue,
960 req->rcall || req->err);
961 } while (!req->rcall && !req->err &&
962 err == -ERESTARTSYS &&
963 client->status == Connected && !m->err);
971 spin_lock_irqsave(¤t->sighand->siglock, flags);
973 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
981 p9_mux_free_request(m, req);
989 * parse_options - parse mount options into session structure
990 * @options: options string passed from mount
991 * @opts: transport-specific structure to parse options into
993 * Returns 0 upon success, -ERRNO upon failure
996 static int parse_opts(char *params, struct p9_fd_opts *opts)
999 substring_t args[MAX_OPT_ARGS];
1004 opts->port = P9_PORT;
1011 options = kstrdup(params, GFP_KERNEL);
1013 P9_DPRINTK(P9_DEBUG_ERROR,
1014 "failed to allocate copy of option string\n");
1018 while ((p = strsep(&options, ",")) != NULL) {
1023 token = match_token(p, tokens, args);
1024 r = match_int(&args[0], &option);
1026 P9_DPRINTK(P9_DEBUG_ERROR,
1027 "integer field, but no integer?\n");
1033 opts->port = option;
1049 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
1051 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
1058 if (!ts->rd || !ts->wr) {
1068 client->status = Connected;
1073 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
1077 csocket->sk->sk_allocation = GFP_NOIO;
1078 fd = sock_map_fd(csocket, 0);
1080 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
1084 ret = p9_fd_open(client, fd, fd);
1086 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n");
1087 sockfd_put(csocket);
1091 ((struct p9_trans_fd *)client->trans)->rd->f_flags |= O_NONBLOCK;
1097 * p9_mux_destroy - cancels all pending requests and frees mux resources
1098 * @m: mux to destroy
1102 static void p9_conn_destroy(struct p9_conn *m)
1104 P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m,
1105 m->mux_list.prev, m->mux_list.next);
1107 p9_mux_poll_stop(m);
1108 cancel_work_sync(&m->rq);
1109 cancel_work_sync(&m->wq);
1111 p9_conn_cancel(m, -ECONNRESET);
1118 * p9_fd_close - shutdown file descriptor transport
1119 * @client: client instance
1123 static void p9_fd_close(struct p9_client *client)
1125 struct p9_trans_fd *ts;
1134 client->status = Disconnected;
1136 p9_conn_destroy(ts->conn);
1147 * stolen from NFS - maybe should be made a generic function?
1149 static inline int valid_ipaddr4(const char *buf)
1151 int rc, count, in[4];
1153 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
1156 for (count = 0; count < 4; count++) {
1157 if (in[count] > 255)
1164 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
1167 struct socket *csocket;
1168 struct sockaddr_in sin_server;
1169 struct p9_fd_opts opts;
1170 struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
1172 err = parse_opts(args, &opts);
1176 if (valid_ipaddr4(addr) < 0)
1181 sin_server.sin_family = AF_INET;
1182 sin_server.sin_addr.s_addr = in_aton(addr);
1183 sin_server.sin_port = htons(opts.port);
1184 sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
1187 P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n");
1192 err = csocket->ops->connect(csocket,
1193 (struct sockaddr *)&sin_server,
1194 sizeof(struct sockaddr_in), 0);
1196 P9_EPRINTK(KERN_ERR,
1197 "p9_trans_tcp: problem connecting socket to %s\n",
1202 err = p9_socket_open(client, csocket);
1206 p = (struct p9_trans_fd *) client->trans;
1207 p->conn = p9_conn_create(client);
1208 if (IS_ERR(p->conn)) {
1209 err = PTR_ERR(p->conn);
1218 sock_release(csocket);
1226 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
1229 struct socket *csocket;
1230 struct sockaddr_un sun_server;
1231 struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
1235 if (strlen(addr) > UNIX_PATH_MAX) {
1236 P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
1238 err = -ENAMETOOLONG;
1242 sun_server.sun_family = PF_UNIX;
1243 strcpy(sun_server.sun_path, addr);
1244 sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
1245 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1246 sizeof(struct sockaddr_un) - 1, 0);
1248 P9_EPRINTK(KERN_ERR,
1249 "p9_trans_unix: problem connecting socket: %s: %d\n",
1254 err = p9_socket_open(client, csocket);
1258 p = (struct p9_trans_fd *) client->trans;
1259 p->conn = p9_conn_create(client);
1260 if (IS_ERR(p->conn)) {
1261 err = PTR_ERR(p->conn);
1270 sock_release(csocket);
1277 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1280 struct p9_fd_opts opts;
1281 struct p9_trans_fd *p = NULL; /* this get allocated in p9_fd_open */
1283 parse_opts(args, &opts);
1285 if (opts.rfd == ~0 || opts.wfd == ~0) {
1286 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
1287 return -ENOPROTOOPT;
1290 err = p9_fd_open(client, opts.rfd, opts.wfd);
1294 p = (struct p9_trans_fd *) client->trans;
1295 p->conn = p9_conn_create(client);
1296 if (IS_ERR(p->conn)) {
1297 err = PTR_ERR(p->conn);
1309 static struct p9_trans_module p9_tcp_trans = {
1311 .maxsize = MAX_SOCK_BUF,
1313 .create = p9_fd_create_tcp,
1314 .close = p9_fd_close,
1316 .owner = THIS_MODULE,
1319 static struct p9_trans_module p9_unix_trans = {
1321 .maxsize = MAX_SOCK_BUF,
1323 .create = p9_fd_create_unix,
1324 .close = p9_fd_close,
1326 .owner = THIS_MODULE,
1329 static struct p9_trans_module p9_fd_trans = {
1331 .maxsize = MAX_SOCK_BUF,
1333 .create = p9_fd_create,
1334 .close = p9_fd_close,
1336 .owner = THIS_MODULE,
1340 * p9_poll_proc - poll worker thread
1341 * @a: thread state and arguments
1343 * polls all v9fs transports for new events and queues the appropriate
1344 * work to the work queue
1348 static int p9_poll_proc(void *a)
1350 unsigned long flags;
1352 P9_DPRINTK(P9_DEBUG_MUX, "start %p\n", current);
1354 spin_lock_irqsave(&p9_poll_lock, flags);
1355 while (!list_empty(&p9_poll_pending_list)) {
1356 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1359 list_del_init(&conn->poll_pending_link);
1360 spin_unlock_irqrestore(&p9_poll_lock, flags);
1364 spin_lock_irqsave(&p9_poll_lock, flags);
1366 spin_unlock_irqrestore(&p9_poll_lock, flags);
1368 set_current_state(TASK_INTERRUPTIBLE);
1369 if (list_empty(&p9_poll_pending_list)) {
1370 P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n");
1373 __set_current_state(TASK_RUNNING);
1375 if (!kthread_should_stop())
1378 P9_DPRINTK(P9_DEBUG_MUX, "finish\n");
1382 int p9_trans_fd_init(void)
1384 p9_mux_wq = create_workqueue("v9fs");
1386 printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n");
1390 p9_poll_task = kthread_run(p9_poll_proc, NULL, "v9fs-poll");
1391 if (IS_ERR(p9_poll_task)) {
1392 destroy_workqueue(p9_mux_wq);
1393 printk(KERN_WARNING "v9fs: mux: creating poll task failed\n");
1394 return PTR_ERR(p9_poll_task);
1397 v9fs_register_trans(&p9_tcp_trans);
1398 v9fs_register_trans(&p9_unix_trans);
1399 v9fs_register_trans(&p9_fd_trans);
1404 void p9_trans_fd_exit(void)
1406 kthread_stop(p9_poll_task);
1407 v9fs_unregister_trans(&p9_tcp_trans);
1408 v9fs_unregister_trans(&p9_unix_trans);
1409 v9fs_unregister_trans(&p9_fd_trans);
1411 destroy_workqueue(p9_mux_wq);