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)
66 * struct p9_trans_fd - transport state
67 * @rd: reference to file to read from
68 * @wr: reference of file to write to
69 * @conn: connection state reference
80 * Option Parsing (code inspired by NFS code)
81 * - a little lazy - parse all fd-transport options
85 /* Options that take integer arguments */
86 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
89 static const match_table_t tokens = {
90 {Opt_port, "port=%u"},
91 {Opt_rfdno, "rfdno=%u"},
92 {Opt_wfdno, "wfdno=%u"},
97 Rworksched = 1, /* read work scheduled or running */
98 Rpending = 2, /* can read */
99 Wworksched = 4, /* write work scheduled or running */
100 Wpending = 8, /* can write */
110 typedef void (*p9_conn_req_callback)(struct p9_req *req, void *a);
113 * struct p9_req - fd mux encoding of an rpc transaction
114 * @lock: protects req_list
115 * @tag: numeric tag for rpc transaction
116 * @tcall: request &p9_fcall structure
117 * @rcall: response &p9_fcall structure
119 * @cb: callback for when response is received
120 * @cba: argument to pass to callback
121 * @flush: flag to indicate RPC has been flushed
122 * @req_list: list link for higher level objects to chain requests
129 struct p9_fcall *tcall;
130 struct p9_fcall *rcall;
132 p9_conn_req_callback cb;
135 struct list_head req_list;
138 struct p9_poll_wait {
139 struct p9_conn *conn;
141 wait_queue_head_t *wait_addr;
145 * struct p9_conn - fd mux connection state information
146 * @lock: protects mux_list (?)
147 * @mux_list: list link for mux to manage multiple connections (?)
148 * @msize: maximum size for connection (dup)
149 * @extended: 9p2000.u flag (dup)
150 * @client: reference to client instance for this connection
151 * @tagpool: id accounting for transactions
153 * @req_list: accounting for requests which have been sent
154 * @unsent_req_list: accounting for requests that haven't been sent
155 * @rcall: current response &p9_fcall structure
156 * @rpos: read position in current frame
157 * @rbuf: current read buffer
158 * @wpos: write position for current frame
159 * @wsize: amount of data to write for current frame
160 * @wbuf: current write buffer
161 * @poll_wait: array of wait_q's for various worker threads
164 * @rq: current read work
165 * @wq: current write work
171 spinlock_t lock; /* protect lock structure */
172 struct list_head mux_list;
174 unsigned char extended;
175 struct p9_client *client;
176 struct p9_idpool *tagpool;
178 struct list_head req_list;
179 struct list_head unsent_req_list;
180 struct p9_fcall *rcall;
186 struct list_head poll_pending_link;
187 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
189 struct work_struct rq;
190 struct work_struct wq;
191 unsigned long wsched;
195 * struct p9_mux_rpc - fd mux rpc accounting structure
196 * @m: connection this request was issued on
198 * @tcall: request &p9_fcall
199 * @rcall: response &p9_fcall
200 * @wqueue: wait queue that client is blocked on for this rpc
202 * Bug: isn't this information duplicated elsewhere like &p9_req
208 struct p9_fcall *tcall;
209 struct p9_fcall *rcall;
210 wait_queue_head_t wqueue;
213 static int p9_poll_proc(void *);
214 static void p9_read_work(struct work_struct *work);
215 static void p9_write_work(struct work_struct *work);
216 static void p9_pollwait(struct file *filp, wait_queue_head_t *wait_address,
218 static int p9_fd_write(struct p9_client *client, void *v, int len);
219 static int p9_fd_read(struct p9_client *client, void *v, int len);
221 static DEFINE_SPINLOCK(p9_poll_lock);
222 static LIST_HEAD(p9_poll_pending_list);
223 static struct workqueue_struct *p9_mux_wq;
224 static struct task_struct *p9_poll_task;
226 static void p9_conn_destroy(struct p9_conn *);
227 static unsigned int p9_fd_poll(struct p9_client *client,
228 struct poll_table_struct *pt);
231 static int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc,
232 p9_conn_req_callback cb, void *a);
233 #endif /* P9_NONBLOCK */
235 static void p9_conn_cancel(struct p9_conn *m, int err);
237 static u16 p9_mux_get_tag(struct p9_conn *m)
241 tag = p9_idpool_get(m->tagpool);
248 static void p9_mux_put_tag(struct p9_conn *m, u16 tag)
250 if (tag != P9_NOTAG && p9_idpool_check(tag, m->tagpool))
251 p9_idpool_put(tag, m->tagpool);
254 static void p9_mux_poll_stop(struct p9_conn *m)
259 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
260 struct p9_poll_wait *pwait = &m->poll_wait[i];
262 if (pwait->wait_addr) {
263 remove_wait_queue(pwait->wait_addr, &pwait->wait);
264 pwait->wait_addr = NULL;
268 spin_lock_irqsave(&p9_poll_lock, flags);
269 list_del_init(&m->poll_pending_link);
270 spin_unlock_irqrestore(&p9_poll_lock, flags);
274 * p9_conn_create - allocate and initialize the per-session mux data
275 * @client: client instance
277 * Note: Creates the polling task if this is the first session.
280 static struct p9_conn *p9_conn_create(struct p9_client *client)
285 P9_DPRINTK(P9_DEBUG_MUX, "client %p msize %d\n", client, client->msize);
286 m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
288 return ERR_PTR(-ENOMEM);
290 spin_lock_init(&m->lock);
291 INIT_LIST_HEAD(&m->mux_list);
292 m->msize = client->msize;
293 m->extended = client->dotu;
295 m->tagpool = p9_idpool_create();
296 if (IS_ERR(m->tagpool)) {
298 return ERR_PTR(-ENOMEM);
301 INIT_LIST_HEAD(&m->req_list);
302 INIT_LIST_HEAD(&m->unsent_req_list);
303 INIT_WORK(&m->rq, p9_read_work);
304 INIT_WORK(&m->wq, p9_write_work);
305 INIT_LIST_HEAD(&m->poll_pending_link);
306 init_poll_funcptr(&m->pt, p9_pollwait);
308 n = p9_fd_poll(client, &m->pt);
310 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
311 set_bit(Rpending, &m->wsched);
315 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
316 set_bit(Wpending, &m->wsched);
319 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
320 if (IS_ERR(m->poll_wait[i].wait_addr)) {
323 /* return the error code */
324 return (void *)m->poll_wait[i].wait_addr;
332 * p9_mux_destroy - cancels all pending requests and frees mux resources
337 static void p9_conn_destroy(struct p9_conn *m)
339 P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m,
340 m->mux_list.prev, m->mux_list.next);
343 cancel_work_sync(&m->rq);
344 cancel_work_sync(&m->wq);
346 p9_conn_cancel(m, -ECONNRESET);
349 p9_idpool_destroy(m->tagpool);
353 static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key)
355 struct p9_poll_wait *pwait =
356 container_of(wait, struct p9_poll_wait, wait);
357 struct p9_conn *m = pwait->conn;
359 DECLARE_WAITQUEUE(dummy_wait, p9_poll_task);
361 spin_lock_irqsave(&p9_poll_lock, flags);
362 if (list_empty(&m->poll_pending_link))
363 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
364 spin_unlock_irqrestore(&p9_poll_lock, flags);
366 /* perform the default wake up operation */
367 return default_wake_function(&dummy_wait, mode, sync, key);
371 * p9_pollwait - add poll task to the wait queue
372 * @filp: file pointer being polled
373 * @wait_address: wait_q to block on
376 * called by files poll operation to add v9fs-poll task to files wait queue
380 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
382 struct p9_conn *m = container_of(p, struct p9_conn, pt);
383 struct p9_poll_wait *pwait = NULL;
386 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
387 if (m->poll_wait[i].wait_addr == NULL) {
388 pwait = &m->poll_wait[i];
394 P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
399 P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n");
400 pwait->wait_addr = ERR_PTR(-EIO);
405 pwait->wait_addr = wait_address;
406 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
407 add_wait_queue(wait_address, &pwait->wait);
411 * p9_poll_mux - polls a mux and schedules read or write works if necessary
412 * @m: connection to poll
416 static void p9_poll_mux(struct p9_conn *m)
423 n = p9_fd_poll(m->client, NULL);
424 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
425 P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n);
428 p9_conn_cancel(m, n);
432 set_bit(Rpending, &m->wsched);
433 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
434 if (!test_and_set_bit(Rworksched, &m->wsched)) {
435 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
436 queue_work(p9_mux_wq, &m->rq);
441 set_bit(Wpending, &m->wsched);
442 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
443 if ((m->wsize || !list_empty(&m->unsent_req_list))
444 && !test_and_set_bit(Wworksched, &m->wsched)) {
445 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
446 queue_work(p9_mux_wq, &m->wq);
452 * p9_poll_proc - poll worker thread
453 * @a: thread state and arguments
455 * polls all v9fs transports for new events and queues the appropriate
456 * work to the work queue
460 static int p9_poll_proc(void *a)
464 P9_DPRINTK(P9_DEBUG_MUX, "start %p\n", current);
466 spin_lock_irqsave(&p9_poll_lock, flags);
467 while (!list_empty(&p9_poll_pending_list)) {
468 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
471 list_del_init(&conn->poll_pending_link);
472 spin_unlock_irqrestore(&p9_poll_lock, flags);
476 spin_lock_irqsave(&p9_poll_lock, flags);
478 spin_unlock_irqrestore(&p9_poll_lock, flags);
480 set_current_state(TASK_INTERRUPTIBLE);
481 if (list_empty(&p9_poll_pending_list)) {
482 P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n");
485 __set_current_state(TASK_RUNNING);
487 if (!kthread_should_stop())
490 P9_DPRINTK(P9_DEBUG_MUX, "finish\n");
495 * p9_write_work - called when a transport can send some data
496 * @work: container for work to be done
500 static void p9_write_work(struct work_struct *work)
506 m = container_of(work, struct p9_conn, wq);
509 clear_bit(Wworksched, &m->wsched);
514 if (list_empty(&m->unsent_req_list)) {
515 clear_bit(Wworksched, &m->wsched);
521 req = list_entry(m->unsent_req_list.next, struct p9_req,
523 list_move_tail(&req->req_list, &m->req_list);
524 if (req->err == ERREQFLUSH)
527 m->wbuf = req->tcall->sdata;
528 m->wsize = req->tcall->size;
530 spin_unlock(&m->lock);
533 P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos,
535 clear_bit(Wpending, &m->wsched);
536 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
537 P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err);
538 if (err == -EAGAIN) {
539 clear_bit(Wworksched, &m->wsched);
551 if (m->wpos == m->wsize)
552 m->wpos = m->wsize = 0;
554 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
555 if (test_and_clear_bit(Wpending, &m->wsched))
558 n = p9_fd_poll(m->client, NULL);
561 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
562 queue_work(p9_mux_wq, &m->wq);
564 clear_bit(Wworksched, &m->wsched);
566 clear_bit(Wworksched, &m->wsched);
571 p9_conn_cancel(m, err);
572 clear_bit(Wworksched, &m->wsched);
575 static void process_request(struct p9_conn *m, struct p9_req *req)
578 struct p9_str *ename;
580 if (!req->err && req->rcall->id == P9_RERROR) {
581 ecode = req->rcall->params.rerror.errno;
582 ename = &req->rcall->params.rerror.error;
584 P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len,
591 req->err = p9_errstr2errno(ename->str, ename->len);
593 /* string match failed */
595 PRINT_FCALL_ERROR("unknown error", req->rcall);
596 req->err = -ESERVERFAULT;
599 } else if (req->tcall && req->rcall->id != req->tcall->id + 1) {
600 P9_DPRINTK(P9_DEBUG_ERROR,
601 "fcall mismatch: expected %d, got %d\n",
602 req->tcall->id + 1, req->rcall->id);
609 * p9_read_work - called when there is some data to be read from a transport
610 * @work: container of work to be done
614 static void p9_read_work(struct work_struct *work)
618 struct p9_req *req, *rptr, *rreq;
619 struct p9_fcall *rcall;
622 m = container_of(work, struct p9_conn, rq);
628 P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
632 kmalloc(sizeof(struct p9_fcall) + m->msize, GFP_KERNEL);
638 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
642 clear_bit(Rpending, &m->wsched);
643 err = p9_fd_read(m->client, m->rbuf + m->rpos, m->msize - m->rpos);
644 P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err);
645 if (err == -EAGAIN) {
646 clear_bit(Rworksched, &m->wsched);
654 while (m->rpos > 4) {
655 n = le32_to_cpu(*(__le32 *) m->rbuf);
657 P9_DPRINTK(P9_DEBUG_ERROR,
658 "requested packet size too big: %d\n", n);
667 p9_deserialize_fcall(m->rbuf, n, m->rcall, m->extended);
671 #ifdef CONFIG_NET_9P_DEBUG
672 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
675 p9_printfcall(buf, sizeof(buf), m->rcall,
677 printk(KERN_NOTICE ">>> %p %s\n", m, buf);
684 m->rcall = kmalloc(sizeof(struct p9_fcall) + m->msize,
691 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
692 memmove(m->rbuf, rbuf + n, m->rpos - n);
700 P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m,
701 rcall->id, rcall->tag);
705 list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
706 if (rreq->tag == rcall->tag) {
708 if (req->flush != Flushing)
709 list_del(&req->req_list);
713 spin_unlock(&m->lock);
717 process_request(m, req);
719 if (req->flush != Flushing) {
721 (*req->cb) (req, req->cba);
726 if (err >= 0 && rcall->id != P9_RFLUSH)
727 P9_DPRINTK(P9_DEBUG_ERROR,
728 "unexpected response mux %p id %d tag %d\n",
729 m, rcall->id, rcall->tag);
734 if (!list_empty(&m->req_list)) {
735 if (test_and_clear_bit(Rpending, &m->wsched))
738 n = p9_fd_poll(m->client, NULL);
741 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
742 queue_work(p9_mux_wq, &m->rq);
744 clear_bit(Rworksched, &m->wsched);
746 clear_bit(Rworksched, &m->wsched);
751 p9_conn_cancel(m, err);
752 clear_bit(Rworksched, &m->wsched);
756 * p9_send_request - send 9P request
757 * The function can sleep until the request is scheduled for sending.
758 * The function can be interrupted. Return from the function is not
759 * a guarantee that the request is sent successfully. Can return errors
760 * that can be retrieved by PTR_ERR macros.
763 * @tc: request to be sent
764 * @cb: callback function to call when response is received
765 * @cba: parameter to pass to the callback function
769 static struct p9_req *p9_send_request(struct p9_conn *m,
771 p9_conn_req_callback cb, void *cba)
776 P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current,
779 return ERR_PTR(m->err);
781 req = kmalloc(sizeof(struct p9_req), GFP_KERNEL);
783 return ERR_PTR(-ENOMEM);
785 if (tc->id == P9_TVERSION)
788 n = p9_mux_get_tag(m);
792 return ERR_PTR(-ENOMEM);
797 #ifdef CONFIG_NET_9P_DEBUG
798 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
801 p9_printfcall(buf, sizeof(buf), tc, m->extended);
802 printk(KERN_NOTICE "<<< %p %s\n", m, buf);
806 spin_lock_init(&req->lock);
816 list_add_tail(&req->req_list, &m->unsent_req_list);
817 spin_unlock(&m->lock);
819 if (test_and_clear_bit(Wpending, &m->wsched))
822 n = p9_fd_poll(m->client, NULL);
824 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
825 queue_work(p9_mux_wq, &m->wq);
830 static void p9_mux_free_request(struct p9_conn *m, struct p9_req *req)
832 p9_mux_put_tag(m, req->tag);
836 static void p9_mux_flush_cb(struct p9_req *freq, void *a)
840 struct p9_req *req, *rreq, *rptr;
843 P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m,
844 freq->tcall, freq->rcall, freq->err,
845 freq->tcall->params.tflush.oldtag);
848 tag = freq->tcall->params.tflush.oldtag;
850 list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
851 if (rreq->tag == tag) {
853 list_del(&req->req_list);
857 spin_unlock(&m->lock);
860 spin_lock(&req->lock);
861 req->flush = Flushed;
862 spin_unlock(&req->lock);
865 (*req->cb) (req, req->cba);
872 p9_mux_free_request(m, freq);
876 p9_mux_flush_request(struct p9_conn *m, struct p9_req *req)
879 struct p9_req *rreq, *rptr;
881 P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag);
883 /* if a response was received for a request, do nothing */
884 spin_lock(&req->lock);
885 if (req->rcall || req->err) {
886 spin_unlock(&req->lock);
887 P9_DPRINTK(P9_DEBUG_MUX,
888 "mux %p req %p response already received\n", m, req);
892 req->flush = Flushing;
893 spin_unlock(&req->lock);
896 /* if the request is not sent yet, just remove it from the list */
897 list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) {
898 if (rreq->tag == req->tag) {
899 P9_DPRINTK(P9_DEBUG_MUX,
900 "mux %p req %p request is not sent yet\n", m, req);
901 list_del(&rreq->req_list);
902 req->flush = Flushed;
903 spin_unlock(&m->lock);
905 (*req->cb) (req, req->cba);
909 spin_unlock(&m->lock);
911 clear_thread_flag(TIF_SIGPENDING);
912 fc = p9_create_tflush(req->tag);
913 p9_send_request(m, fc, p9_mux_flush_cb, m);
918 p9_conn_rpc_cb(struct p9_req *req, void *a)
920 struct p9_mux_rpc *r;
922 P9_DPRINTK(P9_DEBUG_MUX, "req %p r %p\n", req, a);
924 r->rcall = req->rcall;
927 if (req->flush != None && !req->err)
928 r->err = -ERESTARTSYS;
934 * p9_fd_rpc- sends 9P request and waits until a response is available.
935 * The function can be interrupted.
936 * @client: client instance
937 * @tc: request to be sent
938 * @rc: pointer where a pointer to the response is stored
943 p9_fd_rpc(struct p9_client *client, struct p9_fcall *tc, struct p9_fcall **rc)
945 struct p9_trans_fd *p = client->trans;
946 struct p9_conn *m = p->conn;
956 init_waitqueue_head(&r.wqueue);
962 if (signal_pending(current)) {
964 clear_thread_flag(TIF_SIGPENDING);
967 req = p9_send_request(m, tc, p9_conn_rpc_cb, &r);
970 P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err);
974 err = wait_event_interruptible(r.wqueue, r.rcall != NULL || r.err < 0);
978 if (err == -ERESTARTSYS && client->status == Connected
980 if (p9_mux_flush_request(m, req)) {
981 /* wait until we get response of the flush message */
983 clear_thread_flag(TIF_SIGPENDING);
984 err = wait_event_interruptible(r.wqueue,
986 } while (!r.rcall && !r.err && err == -ERESTARTSYS &&
987 client->status == Connected && !m->err);
995 spin_lock_irqsave(¤t->sighand->siglock, flags);
997 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
1005 p9_mux_free_request(m, req);
1014 * p9_conn_rpcnb - sends 9P request without waiting for response.
1016 * @tc: request to be sent
1017 * @cb: callback function to be called when response arrives
1018 * @a: value to pass to the callback function
1022 int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc,
1023 p9_conn_req_callback cb, void *a)
1028 req = p9_send_request(m, tc, cb, a);
1031 P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err);
1032 return PTR_ERR(req);
1035 P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag);
1038 #endif /* P9_NONBLOCK */
1041 * p9_conn_cancel - cancel all pending requests with error
1047 void p9_conn_cancel(struct p9_conn *m, int err)
1049 struct p9_req *req, *rtmp;
1050 LIST_HEAD(cancel_list);
1052 P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
1054 spin_lock(&m->lock);
1055 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
1056 list_move(&req->req_list, &cancel_list);
1058 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
1059 list_move(&req->req_list, &cancel_list);
1061 spin_unlock(&m->lock);
1063 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
1064 list_del(&req->req_list);
1069 (*req->cb) (req, req->cba);
1076 * parse_options - parse mount options into session structure
1077 * @options: options string passed from mount
1078 * @opts: transport-specific structure to parse options into
1080 * Returns 0 upon success, -ERRNO upon failure
1083 static int parse_opts(char *params, struct p9_fd_opts *opts)
1086 substring_t args[MAX_OPT_ARGS];
1091 opts->port = P9_PORT;
1098 options = kstrdup(params, GFP_KERNEL);
1100 P9_DPRINTK(P9_DEBUG_ERROR,
1101 "failed to allocate copy of option string\n");
1105 while ((p = strsep(&options, ",")) != NULL) {
1110 token = match_token(p, tokens, args);
1111 r = match_int(&args[0], &option);
1113 P9_DPRINTK(P9_DEBUG_ERROR,
1114 "integer field, but no integer?\n");
1120 opts->port = option;
1136 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
1138 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
1145 if (!ts->rd || !ts->wr) {
1155 client->status = Connected;
1160 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
1164 csocket->sk->sk_allocation = GFP_NOIO;
1165 fd = sock_map_fd(csocket, 0);
1167 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
1171 ret = p9_fd_open(client, fd, fd);
1173 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n");
1174 sockfd_put(csocket);
1178 ((struct p9_trans_fd *)client->trans)->rd->f_flags |= O_NONBLOCK;
1184 * p9_fd_read- read from a fd
1185 * @client: client instance
1186 * @v: buffer to receive data into
1187 * @len: size of receive buffer
1191 static int p9_fd_read(struct p9_client *client, void *v, int len)
1194 struct p9_trans_fd *ts = NULL;
1196 if (client && client->status != Disconnected)
1202 if (!(ts->rd->f_flags & O_NONBLOCK))
1203 P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
1205 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
1206 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
1207 client->status = Disconnected;
1212 * p9_fd_write - write to a socket
1213 * @client: client instance
1214 * @v: buffer to send data from
1215 * @len: size of send buffer
1219 static int p9_fd_write(struct p9_client *client, void *v, int len)
1223 struct p9_trans_fd *ts = NULL;
1225 if (client && client->status != Disconnected)
1231 if (!(ts->wr->f_flags & O_NONBLOCK))
1232 P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
1236 /* The cast to a user pointer is valid due to the set_fs() */
1237 ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos);
1240 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
1241 client->status = Disconnected;
1246 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
1249 struct p9_trans_fd *ts = NULL;
1251 if (client && client->status == Connected)
1257 if (!ts->rd->f_op || !ts->rd->f_op->poll)
1260 if (!ts->wr->f_op || !ts->wr->f_op->poll)
1263 ret = ts->rd->f_op->poll(ts->rd, pt);
1267 if (ts->rd != ts->wr) {
1268 n = ts->wr->f_op->poll(ts->wr, pt);
1271 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
1278 * p9_fd_close - shutdown file descriptor transport
1279 * @client: client instance
1283 static void p9_fd_close(struct p9_client *client)
1285 struct p9_trans_fd *ts;
1294 client->status = Disconnected;
1296 p9_conn_destroy(ts->conn);
1307 * stolen from NFS - maybe should be made a generic function?
1309 static inline int valid_ipaddr4(const char *buf)
1311 int rc, count, in[4];
1313 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
1316 for (count = 0; count < 4; count++) {
1317 if (in[count] > 255)
1324 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
1327 struct socket *csocket;
1328 struct sockaddr_in sin_server;
1329 struct p9_fd_opts opts;
1330 struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
1332 err = parse_opts(args, &opts);
1336 if (valid_ipaddr4(addr) < 0)
1341 sin_server.sin_family = AF_INET;
1342 sin_server.sin_addr.s_addr = in_aton(addr);
1343 sin_server.sin_port = htons(opts.port);
1344 sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
1347 P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n");
1352 err = csocket->ops->connect(csocket,
1353 (struct sockaddr *)&sin_server,
1354 sizeof(struct sockaddr_in), 0);
1356 P9_EPRINTK(KERN_ERR,
1357 "p9_trans_tcp: problem connecting socket to %s\n",
1362 err = p9_socket_open(client, csocket);
1366 p = (struct p9_trans_fd *) client->trans;
1367 p->conn = p9_conn_create(client);
1368 if (IS_ERR(p->conn)) {
1369 err = PTR_ERR(p->conn);
1378 sock_release(csocket);
1386 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
1389 struct socket *csocket;
1390 struct sockaddr_un sun_server;
1391 struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
1395 if (strlen(addr) > UNIX_PATH_MAX) {
1396 P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
1398 err = -ENAMETOOLONG;
1402 sun_server.sun_family = PF_UNIX;
1403 strcpy(sun_server.sun_path, addr);
1404 sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
1405 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1406 sizeof(struct sockaddr_un) - 1, 0);
1408 P9_EPRINTK(KERN_ERR,
1409 "p9_trans_unix: problem connecting socket: %s: %d\n",
1414 err = p9_socket_open(client, csocket);
1418 p = (struct p9_trans_fd *) client->trans;
1419 p->conn = p9_conn_create(client);
1420 if (IS_ERR(p->conn)) {
1421 err = PTR_ERR(p->conn);
1430 sock_release(csocket);
1437 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1440 struct p9_fd_opts opts;
1441 struct p9_trans_fd *p = NULL; /* this get allocated in p9_fd_open */
1443 parse_opts(args, &opts);
1445 if (opts.rfd == ~0 || opts.wfd == ~0) {
1446 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
1447 return -ENOPROTOOPT;
1450 err = p9_fd_open(client, opts.rfd, opts.wfd);
1454 p = (struct p9_trans_fd *) client->trans;
1455 p->conn = p9_conn_create(client);
1456 if (IS_ERR(p->conn)) {
1457 err = PTR_ERR(p->conn);
1469 static struct p9_trans_module p9_tcp_trans = {
1471 .maxsize = MAX_SOCK_BUF,
1473 .create = p9_fd_create_tcp,
1474 .close = p9_fd_close,
1476 .owner = THIS_MODULE,
1479 static struct p9_trans_module p9_unix_trans = {
1481 .maxsize = MAX_SOCK_BUF,
1483 .create = p9_fd_create_unix,
1484 .close = p9_fd_close,
1486 .owner = THIS_MODULE,
1489 static struct p9_trans_module p9_fd_trans = {
1491 .maxsize = MAX_SOCK_BUF,
1493 .create = p9_fd_create,
1494 .close = p9_fd_close,
1496 .owner = THIS_MODULE,
1499 int p9_trans_fd_init(void)
1501 p9_mux_wq = create_workqueue("v9fs");
1503 printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n");
1507 p9_poll_task = kthread_run(p9_poll_proc, NULL, "v9fs-poll");
1508 if (IS_ERR(p9_poll_task)) {
1509 destroy_workqueue(p9_mux_wq);
1510 printk(KERN_WARNING "v9fs: mux: creating poll task failed\n");
1511 return PTR_ERR(p9_poll_task);
1514 v9fs_register_trans(&p9_tcp_trans);
1515 v9fs_register_trans(&p9_unix_trans);
1516 v9fs_register_trans(&p9_fd_trans);
1521 void p9_trans_fd_exit(void)
1523 kthread_stop(p9_poll_task);
1524 v9fs_unregister_trans(&p9_tcp_trans);
1525 v9fs_unregister_trans(&p9_unix_trans);
1526 v9fs_unregister_trans(&p9_fd_trans);
1528 destroy_workqueue(p9_mux_wq);