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/transport.h>
45 #define MAX_SOCK_BUF (64*1024)
47 #define SCHED_TIMEOUT 10
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 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_mux_poll_task {
139 struct task_struct *task;
140 struct list_head mux_list;
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 * @poll_task: task polling on this connection
149 * @msize: maximum size for connection (dup)
150 * @extended: 9p2000.u flag (dup)
151 * @trans: reference to transport 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_mux_poll_task *poll_task;
176 unsigned char extended;
177 struct p9_trans *trans;
178 struct p9_idpool *tagpool;
180 struct list_head req_list;
181 struct list_head unsent_req_list;
182 struct p9_fcall *rcall;
188 wait_queue_t poll_wait[MAXPOLLWADDR];
189 wait_queue_head_t *poll_waddr[MAXPOLLWADDR];
191 struct work_struct rq;
192 struct work_struct wq;
193 unsigned long wsched;
197 * struct p9_mux_rpc - fd mux rpc accounting structure
198 * @m: connection this request was issued on
200 * @tcall: request &p9_fcall
201 * @rcall: response &p9_fcall
202 * @wqueue: wait queue that client is blocked on for this rpc
204 * Bug: isn't this information duplicated elsewhere like &p9_req
210 struct p9_fcall *tcall;
211 struct p9_fcall *rcall;
212 wait_queue_head_t wqueue;
215 static int p9_poll_proc(void *);
216 static void p9_read_work(struct work_struct *work);
217 static void p9_write_work(struct work_struct *work);
218 static void p9_pollwait(struct file *filp, wait_queue_head_t *wait_address,
220 static int p9_fd_write(struct p9_trans *trans, void *v, int len);
221 static int p9_fd_read(struct p9_trans *trans, void *v, int len);
223 static DEFINE_MUTEX(p9_mux_task_lock);
224 static struct workqueue_struct *p9_mux_wq;
226 static int p9_mux_num;
227 static int p9_mux_poll_task_num;
228 static struct p9_mux_poll_task p9_mux_poll_tasks[100];
230 static void p9_conn_destroy(struct p9_conn *);
231 static unsigned int p9_fd_poll(struct p9_trans *trans,
232 struct poll_table_struct *pt);
235 static int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc,
236 p9_conn_req_callback cb, void *a);
237 #endif /* P9_NONBLOCK */
239 static void p9_conn_cancel(struct p9_conn *m, int err);
241 static u16 p9_mux_get_tag(struct p9_conn *m)
245 tag = p9_idpool_get(m->tagpool);
252 static void p9_mux_put_tag(struct p9_conn *m, u16 tag)
254 if (tag != P9_NOTAG && p9_idpool_check(tag, m->tagpool))
255 p9_idpool_put(tag, m->tagpool);
259 * p9_mux_calc_poll_procs - calculates the number of polling procs
260 * @muxnum: number of mounts
262 * Calculation is based on the number of mounted v9fs filesystems.
263 * The current implementation returns sqrt of the number of mounts.
266 static int p9_mux_calc_poll_procs(int muxnum)
270 if (p9_mux_poll_task_num)
271 n = muxnum / p9_mux_poll_task_num +
272 (muxnum % p9_mux_poll_task_num ? 1 : 0);
276 if (n > ARRAY_SIZE(p9_mux_poll_tasks))
277 n = ARRAY_SIZE(p9_mux_poll_tasks);
282 static int p9_mux_poll_start(struct p9_conn *m)
285 struct p9_mux_poll_task *vpt, *vptlast;
286 struct task_struct *pproc;
288 P9_DPRINTK(P9_DEBUG_MUX, "mux %p muxnum %d procnum %d\n", m, p9_mux_num,
289 p9_mux_poll_task_num);
290 mutex_lock(&p9_mux_task_lock);
292 n = p9_mux_calc_poll_procs(p9_mux_num + 1);
293 if (n > p9_mux_poll_task_num) {
294 for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) {
295 if (p9_mux_poll_tasks[i].task == NULL) {
296 vpt = &p9_mux_poll_tasks[i];
297 P9_DPRINTK(P9_DEBUG_MUX, "create proc %p\n",
299 pproc = kthread_create(p9_poll_proc, vpt,
302 if (!IS_ERR(pproc)) {
304 INIT_LIST_HEAD(&vpt->mux_list);
306 p9_mux_poll_task_num++;
307 wake_up_process(vpt->task);
313 if (i >= ARRAY_SIZE(p9_mux_poll_tasks))
314 P9_DPRINTK(P9_DEBUG_ERROR,
315 "warning: no free poll slots\n");
318 n = (p9_mux_num + 1) / p9_mux_poll_task_num +
319 ((p9_mux_num + 1) % p9_mux_poll_task_num ? 1 : 0);
322 for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) {
323 vpt = &p9_mux_poll_tasks[i];
324 if (vpt->task != NULL) {
326 if (vpt->muxnum < n) {
327 P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i);
328 list_add(&m->mux_list, &vpt->mux_list);
331 memset(&m->poll_waddr, 0,
332 sizeof(m->poll_waddr));
333 init_poll_funcptr(&m->pt, p9_pollwait);
339 if (i >= ARRAY_SIZE(p9_mux_poll_tasks)) {
340 if (vptlast == NULL) {
341 mutex_unlock(&p9_mux_task_lock);
345 P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i);
346 list_add(&m->mux_list, &vptlast->mux_list);
348 m->poll_task = vptlast;
349 memset(&m->poll_waddr, 0, sizeof(m->poll_waddr));
350 init_poll_funcptr(&m->pt, p9_pollwait);
354 mutex_unlock(&p9_mux_task_lock);
359 static void p9_mux_poll_stop(struct p9_conn *m)
362 struct p9_mux_poll_task *vpt;
364 mutex_lock(&p9_mux_task_lock);
366 list_del(&m->mux_list);
367 for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) {
368 if (m->poll_waddr[i] != NULL) {
369 remove_wait_queue(m->poll_waddr[i], &m->poll_wait[i]);
370 m->poll_waddr[i] = NULL;
375 P9_DPRINTK(P9_DEBUG_MUX, "destroy proc %p\n", vpt);
376 kthread_stop(vpt->task);
378 p9_mux_poll_task_num--;
381 mutex_unlock(&p9_mux_task_lock);
385 * p9_conn_create - allocate and initialize the per-session mux data
386 * @trans: transport structure
388 * Note: Creates the polling task if this is the first session.
391 static struct p9_conn *p9_conn_create(struct p9_trans *trans)
396 P9_DPRINTK(P9_DEBUG_MUX, "transport %p msize %d\n", trans,
398 m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
400 return ERR_PTR(-ENOMEM);
402 spin_lock_init(&m->lock);
403 INIT_LIST_HEAD(&m->mux_list);
404 m->msize = trans->msize;
405 m->extended = trans->extended;
407 m->tagpool = p9_idpool_create();
408 if (IS_ERR(m->tagpool)) {
410 return ERR_PTR(-ENOMEM);
413 INIT_LIST_HEAD(&m->req_list);
414 INIT_LIST_HEAD(&m->unsent_req_list);
415 INIT_WORK(&m->rq, p9_read_work);
416 INIT_WORK(&m->wq, p9_write_work);
417 n = p9_mux_poll_start(m);
423 n = p9_fd_poll(trans, &m->pt);
425 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
426 set_bit(Rpending, &m->wsched);
430 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
431 set_bit(Wpending, &m->wsched);
434 for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) {
435 if (IS_ERR(m->poll_waddr[i])) {
438 return (void *)m->poll_waddr; /* the error code */
446 * p9_mux_destroy - cancels all pending requests and frees mux resources
451 static void p9_conn_destroy(struct p9_conn *m)
453 P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m,
454 m->mux_list.prev, m->mux_list.next);
457 cancel_work_sync(&m->rq);
458 cancel_work_sync(&m->wq);
460 p9_conn_cancel(m, -ECONNRESET);
463 p9_idpool_destroy(m->tagpool);
468 * p9_pollwait - add poll task to the wait queue
469 * @filp: file pointer being polled
470 * @wait_address: wait_q to block on
473 * called by files poll operation to add v9fs-poll task to files wait queue
477 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
482 m = container_of(p, struct p9_conn, pt);
483 for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++)
484 if (m->poll_waddr[i] == NULL)
487 if (i >= ARRAY_SIZE(m->poll_waddr)) {
488 P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
492 m->poll_waddr[i] = wait_address;
495 P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n");
496 m->poll_waddr[i] = ERR_PTR(-EIO);
500 init_waitqueue_entry(&m->poll_wait[i], m->poll_task->task);
501 add_wait_queue(wait_address, &m->poll_wait[i]);
505 * p9_poll_mux - polls a mux and schedules read or write works if necessary
506 * @m: connection to poll
510 static void p9_poll_mux(struct p9_conn *m)
517 n = p9_fd_poll(m->trans, NULL);
518 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
519 P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n);
522 p9_conn_cancel(m, n);
526 set_bit(Rpending, &m->wsched);
527 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
528 if (!test_and_set_bit(Rworksched, &m->wsched)) {
529 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
530 queue_work(p9_mux_wq, &m->rq);
535 set_bit(Wpending, &m->wsched);
536 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
537 if ((m->wsize || !list_empty(&m->unsent_req_list))
538 && !test_and_set_bit(Wworksched, &m->wsched)) {
539 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
540 queue_work(p9_mux_wq, &m->wq);
546 * p9_poll_proc - poll worker thread
547 * @a: thread state and arguments
549 * polls all v9fs transports for new events and queues the appropriate
550 * work to the work queue
554 static int p9_poll_proc(void *a)
556 struct p9_conn *m, *mtmp;
557 struct p9_mux_poll_task *vpt;
560 P9_DPRINTK(P9_DEBUG_MUX, "start %p %p\n", current, vpt);
561 while (!kthread_should_stop()) {
562 set_current_state(TASK_INTERRUPTIBLE);
564 list_for_each_entry_safe(m, mtmp, &vpt->mux_list, mux_list) {
568 P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n");
569 schedule_timeout(SCHED_TIMEOUT * HZ);
572 __set_current_state(TASK_RUNNING);
573 P9_DPRINTK(P9_DEBUG_MUX, "finish\n");
578 * p9_write_work - called when a transport can send some data
579 * @work: container for work to be done
583 static void p9_write_work(struct work_struct *work)
589 m = container_of(work, struct p9_conn, wq);
592 clear_bit(Wworksched, &m->wsched);
597 if (list_empty(&m->unsent_req_list)) {
598 clear_bit(Wworksched, &m->wsched);
604 req = list_entry(m->unsent_req_list.next, struct p9_req,
606 list_move_tail(&req->req_list, &m->req_list);
607 if (req->err == ERREQFLUSH)
610 m->wbuf = req->tcall->sdata;
611 m->wsize = req->tcall->size;
613 spin_unlock(&m->lock);
616 P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos,
618 clear_bit(Wpending, &m->wsched);
619 err = p9_fd_write(m->trans, m->wbuf + m->wpos, m->wsize - m->wpos);
620 P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err);
621 if (err == -EAGAIN) {
622 clear_bit(Wworksched, &m->wsched);
634 if (m->wpos == m->wsize)
635 m->wpos = m->wsize = 0;
637 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
638 if (test_and_clear_bit(Wpending, &m->wsched))
641 n = p9_fd_poll(m->trans, NULL);
644 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
645 queue_work(p9_mux_wq, &m->wq);
647 clear_bit(Wworksched, &m->wsched);
649 clear_bit(Wworksched, &m->wsched);
654 p9_conn_cancel(m, err);
655 clear_bit(Wworksched, &m->wsched);
658 static void process_request(struct p9_conn *m, struct p9_req *req)
661 struct p9_str *ename;
663 if (!req->err && req->rcall->id == P9_RERROR) {
664 ecode = req->rcall->params.rerror.errno;
665 ename = &req->rcall->params.rerror.error;
667 P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len,
674 req->err = p9_errstr2errno(ename->str, ename->len);
676 /* string match failed */
678 PRINT_FCALL_ERROR("unknown error", req->rcall);
679 req->err = -ESERVERFAULT;
682 } else if (req->tcall && req->rcall->id != req->tcall->id + 1) {
683 P9_DPRINTK(P9_DEBUG_ERROR,
684 "fcall mismatch: expected %d, got %d\n",
685 req->tcall->id + 1, req->rcall->id);
692 * p9_read_work - called when there is some data to be read from a transport
693 * @work: container of work to be done
697 static void p9_read_work(struct work_struct *work)
701 struct p9_req *req, *rptr, *rreq;
702 struct p9_fcall *rcall;
705 m = container_of(work, struct p9_conn, rq);
711 P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
715 kmalloc(sizeof(struct p9_fcall) + m->msize, GFP_KERNEL);
721 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
725 clear_bit(Rpending, &m->wsched);
726 err = p9_fd_read(m->trans, m->rbuf + m->rpos, m->msize - m->rpos);
727 P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err);
728 if (err == -EAGAIN) {
729 clear_bit(Rworksched, &m->wsched);
737 while (m->rpos > 4) {
738 n = le32_to_cpu(*(__le32 *) m->rbuf);
740 P9_DPRINTK(P9_DEBUG_ERROR,
741 "requested packet size too big: %d\n", n);
750 p9_deserialize_fcall(m->rbuf, n, m->rcall, m->extended);
754 #ifdef CONFIG_NET_9P_DEBUG
755 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
758 p9_printfcall(buf, sizeof(buf), m->rcall,
760 printk(KERN_NOTICE ">>> %p %s\n", m, buf);
767 m->rcall = kmalloc(sizeof(struct p9_fcall) + m->msize,
774 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
775 memmove(m->rbuf, rbuf + n, m->rpos - n);
783 P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m,
784 rcall->id, rcall->tag);
788 list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
789 if (rreq->tag == rcall->tag) {
791 if (req->flush != Flushing)
792 list_del(&req->req_list);
796 spin_unlock(&m->lock);
800 process_request(m, req);
802 if (req->flush != Flushing) {
804 (*req->cb) (req, req->cba);
809 if (err >= 0 && rcall->id != P9_RFLUSH)
810 P9_DPRINTK(P9_DEBUG_ERROR,
811 "unexpected response mux %p id %d tag %d\n",
812 m, rcall->id, rcall->tag);
817 if (!list_empty(&m->req_list)) {
818 if (test_and_clear_bit(Rpending, &m->wsched))
821 n = p9_fd_poll(m->trans, NULL);
824 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
825 queue_work(p9_mux_wq, &m->rq);
827 clear_bit(Rworksched, &m->wsched);
829 clear_bit(Rworksched, &m->wsched);
834 p9_conn_cancel(m, err);
835 clear_bit(Rworksched, &m->wsched);
839 * p9_send_request - send 9P request
840 * The function can sleep until the request is scheduled for sending.
841 * The function can be interrupted. Return from the function is not
842 * a guarantee that the request is sent successfully. Can return errors
843 * that can be retrieved by PTR_ERR macros.
846 * @tc: request to be sent
847 * @cb: callback function to call when response is received
848 * @cba: parameter to pass to the callback function
852 static struct p9_req *p9_send_request(struct p9_conn *m,
854 p9_conn_req_callback cb, void *cba)
859 P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current,
862 return ERR_PTR(m->err);
864 req = kmalloc(sizeof(struct p9_req), GFP_KERNEL);
866 return ERR_PTR(-ENOMEM);
868 if (tc->id == P9_TVERSION)
871 n = p9_mux_get_tag(m);
874 return ERR_PTR(-ENOMEM);
878 #ifdef CONFIG_NET_9P_DEBUG
879 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
882 p9_printfcall(buf, sizeof(buf), tc, m->extended);
883 printk(KERN_NOTICE "<<< %p %s\n", m, buf);
887 spin_lock_init(&req->lock);
897 list_add_tail(&req->req_list, &m->unsent_req_list);
898 spin_unlock(&m->lock);
900 if (test_and_clear_bit(Wpending, &m->wsched))
903 n = p9_fd_poll(m->trans, NULL);
905 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
906 queue_work(p9_mux_wq, &m->wq);
911 static void p9_mux_free_request(struct p9_conn *m, struct p9_req *req)
913 p9_mux_put_tag(m, req->tag);
917 static void p9_mux_flush_cb(struct p9_req *freq, void *a)
921 struct p9_req *req, *rreq, *rptr;
924 P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m,
925 freq->tcall, freq->rcall, freq->err,
926 freq->tcall->params.tflush.oldtag);
929 tag = freq->tcall->params.tflush.oldtag;
931 list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
932 if (rreq->tag == tag) {
934 list_del(&req->req_list);
938 spin_unlock(&m->lock);
941 spin_lock(&req->lock);
942 req->flush = Flushed;
943 spin_unlock(&req->lock);
946 (*req->cb) (req, req->cba);
953 p9_mux_free_request(m, freq);
957 p9_mux_flush_request(struct p9_conn *m, struct p9_req *req)
960 struct p9_req *rreq, *rptr;
962 P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag);
964 /* if a response was received for a request, do nothing */
965 spin_lock(&req->lock);
966 if (req->rcall || req->err) {
967 spin_unlock(&req->lock);
968 P9_DPRINTK(P9_DEBUG_MUX,
969 "mux %p req %p response already received\n", m, req);
973 req->flush = Flushing;
974 spin_unlock(&req->lock);
977 /* if the request is not sent yet, just remove it from the list */
978 list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) {
979 if (rreq->tag == req->tag) {
980 P9_DPRINTK(P9_DEBUG_MUX,
981 "mux %p req %p request is not sent yet\n", m, req);
982 list_del(&rreq->req_list);
983 req->flush = Flushed;
984 spin_unlock(&m->lock);
986 (*req->cb) (req, req->cba);
990 spin_unlock(&m->lock);
992 clear_thread_flag(TIF_SIGPENDING);
993 fc = p9_create_tflush(req->tag);
994 p9_send_request(m, fc, p9_mux_flush_cb, m);
999 p9_conn_rpc_cb(struct p9_req *req, void *a)
1001 struct p9_mux_rpc *r;
1003 P9_DPRINTK(P9_DEBUG_MUX, "req %p r %p\n", req, a);
1005 r->rcall = req->rcall;
1008 if (req->flush != None && !req->err)
1009 r->err = -ERESTARTSYS;
1011 wake_up(&r->wqueue);
1015 * p9_fd_rpc- sends 9P request and waits until a response is available.
1016 * The function can be interrupted.
1017 * @t: transport data
1018 * @tc: request to be sent
1019 * @rc: pointer where a pointer to the response is stored
1024 p9_fd_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc)
1026 struct p9_trans_fd *p = t->priv;
1027 struct p9_conn *m = p->conn;
1028 int err, sigpending;
1029 unsigned long flags;
1031 struct p9_mux_rpc r;
1037 init_waitqueue_head(&r.wqueue);
1043 if (signal_pending(current)) {
1045 clear_thread_flag(TIF_SIGPENDING);
1048 req = p9_send_request(m, tc, p9_conn_rpc_cb, &r);
1051 P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err);
1055 err = wait_event_interruptible(r.wqueue, r.rcall != NULL || r.err < 0);
1059 if (err == -ERESTARTSYS && m->trans->status == Connected
1061 if (p9_mux_flush_request(m, req)) {
1062 /* wait until we get response of the flush message */
1064 clear_thread_flag(TIF_SIGPENDING);
1065 err = wait_event_interruptible(r.wqueue,
1067 } while (!r.rcall && !r.err && err == -ERESTARTSYS &&
1068 m->trans->status == Connected && !m->err);
1076 spin_lock_irqsave(¤t->sighand->siglock, flags);
1077 recalc_sigpending();
1078 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
1086 p9_mux_free_request(m, req);
1095 * p9_conn_rpcnb - sends 9P request without waiting for response.
1097 * @tc: request to be sent
1098 * @cb: callback function to be called when response arrives
1099 * @a: value to pass to the callback function
1103 int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc,
1104 p9_conn_req_callback cb, void *a)
1109 req = p9_send_request(m, tc, cb, a);
1112 P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err);
1113 return PTR_ERR(req);
1116 P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag);
1119 #endif /* P9_NONBLOCK */
1122 * p9_conn_cancel - cancel all pending requests with error
1128 void p9_conn_cancel(struct p9_conn *m, int err)
1130 struct p9_req *req, *rtmp;
1131 LIST_HEAD(cancel_list);
1133 P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
1135 spin_lock(&m->lock);
1136 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
1137 list_move(&req->req_list, &cancel_list);
1139 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
1140 list_move(&req->req_list, &cancel_list);
1142 spin_unlock(&m->lock);
1144 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
1145 list_del(&req->req_list);
1150 (*req->cb) (req, req->cba);
1157 * parse_options - parse mount options into session structure
1158 * @options: options string passed from mount
1159 * @opts: transport-specific structure to parse options into
1161 * Returns 0 upon success, -ERRNO upon failure
1164 static int parse_opts(char *params, struct p9_fd_opts *opts)
1167 substring_t args[MAX_OPT_ARGS];
1172 opts->port = P9_PORT;
1179 options = kstrdup(params, GFP_KERNEL);
1181 P9_DPRINTK(P9_DEBUG_ERROR,
1182 "failed to allocate copy of option string\n");
1186 while ((p = strsep(&options, ",")) != NULL) {
1191 token = match_token(p, tokens, args);
1192 r = match_int(&args[0], &option);
1194 P9_DPRINTK(P9_DEBUG_ERROR,
1195 "integer field, but no integer?\n");
1201 opts->port = option;
1217 static int p9_fd_open(struct p9_trans *trans, int rfd, int wfd)
1219 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
1226 if (!ts->rd || !ts->wr) {
1236 trans->status = Connected;
1241 static int p9_socket_open(struct p9_trans *trans, struct socket *csocket)
1245 csocket->sk->sk_allocation = GFP_NOIO;
1246 fd = sock_map_fd(csocket, 0);
1248 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
1252 ret = p9_fd_open(trans, fd, fd);
1254 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n");
1255 sockfd_put(csocket);
1259 ((struct p9_trans_fd *)trans->priv)->rd->f_flags |= O_NONBLOCK;
1265 * p9_fd_read- read from a fd
1266 * @trans: transport instance state
1267 * @v: buffer to receive data into
1268 * @len: size of receive buffer
1272 static int p9_fd_read(struct p9_trans *trans, void *v, int len)
1275 struct p9_trans_fd *ts = NULL;
1277 if (trans && trans->status != Disconnected)
1283 if (!(ts->rd->f_flags & O_NONBLOCK))
1284 P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
1286 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
1287 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
1288 trans->status = Disconnected;
1293 * p9_fd_write - write to a socket
1294 * @trans: transport instance state
1295 * @v: buffer to send data from
1296 * @len: size of send buffer
1300 static int p9_fd_write(struct p9_trans *trans, void *v, int len)
1304 struct p9_trans_fd *ts = NULL;
1306 if (trans && trans->status != Disconnected)
1312 if (!(ts->wr->f_flags & O_NONBLOCK))
1313 P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
1317 /* The cast to a user pointer is valid due to the set_fs() */
1318 ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos);
1321 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
1322 trans->status = Disconnected;
1327 p9_fd_poll(struct p9_trans *trans, struct poll_table_struct *pt)
1330 struct p9_trans_fd *ts = NULL;
1332 if (trans && trans->status == Connected)
1338 if (!ts->rd->f_op || !ts->rd->f_op->poll)
1341 if (!ts->wr->f_op || !ts->wr->f_op->poll)
1344 ret = ts->rd->f_op->poll(ts->rd, pt);
1348 if (ts->rd != ts->wr) {
1349 n = ts->wr->f_op->poll(ts->wr, pt);
1352 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
1359 * p9_fd_close - shutdown socket
1360 * @trans: private socket structure
1364 static void p9_fd_close(struct p9_trans *trans)
1366 struct p9_trans_fd *ts;
1371 ts = xchg(&trans->priv, NULL);
1376 p9_conn_destroy(ts->conn);
1378 trans->status = Disconnected;
1387 * stolen from NFS - maybe should be made a generic function?
1389 static inline int valid_ipaddr4(const char *buf)
1391 int rc, count, in[4];
1393 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
1396 for (count = 0; count < 4; count++) {
1397 if (in[count] > 255)
1403 static struct p9_trans *
1404 p9_trans_create_tcp(const char *addr, char *args, int msize, unsigned char dotu)
1407 struct p9_trans *trans;
1408 struct socket *csocket;
1409 struct sockaddr_in sin_server;
1410 struct p9_fd_opts opts;
1411 struct p9_trans_fd *p;
1413 err = parse_opts(args, &opts);
1415 return ERR_PTR(err);
1417 if (valid_ipaddr4(addr) < 0)
1418 return ERR_PTR(-EINVAL);
1421 trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL);
1423 return ERR_PTR(-ENOMEM);
1424 trans->msize = msize;
1425 trans->extended = dotu;
1426 trans->rpc = p9_fd_rpc;
1427 trans->close = p9_fd_close;
1429 sin_server.sin_family = AF_INET;
1430 sin_server.sin_addr.s_addr = in_aton(addr);
1431 sin_server.sin_port = htons(opts.port);
1432 sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
1435 P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n");
1440 err = csocket->ops->connect(csocket,
1441 (struct sockaddr *)&sin_server,
1442 sizeof(struct sockaddr_in), 0);
1444 P9_EPRINTK(KERN_ERR,
1445 "p9_trans_tcp: problem connecting socket to %s\n",
1450 err = p9_socket_open(trans, csocket);
1454 p = (struct p9_trans_fd *) trans->priv;
1455 p->conn = p9_conn_create(trans);
1456 if (IS_ERR(p->conn)) {
1457 err = PTR_ERR(p->conn);
1466 sock_release(csocket);
1469 return ERR_PTR(err);
1472 static struct p9_trans *
1473 p9_trans_create_unix(const char *addr, char *args, int msize,
1477 struct socket *csocket;
1478 struct sockaddr_un sun_server;
1479 struct p9_trans *trans;
1480 struct p9_trans_fd *p;
1483 trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL);
1485 return ERR_PTR(-ENOMEM);
1487 trans->rpc = p9_fd_rpc;
1488 trans->close = p9_fd_close;
1490 if (strlen(addr) > UNIX_PATH_MAX) {
1491 P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
1493 err = -ENAMETOOLONG;
1497 sun_server.sun_family = PF_UNIX;
1498 strcpy(sun_server.sun_path, addr);
1499 sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
1500 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1501 sizeof(struct sockaddr_un) - 1, 0);
1503 P9_EPRINTK(KERN_ERR,
1504 "p9_trans_unix: problem connecting socket: %s: %d\n",
1509 err = p9_socket_open(trans, csocket);
1513 trans->msize = msize;
1514 trans->extended = dotu;
1515 p = (struct p9_trans_fd *) trans->priv;
1516 p->conn = p9_conn_create(trans);
1517 if (IS_ERR(p->conn)) {
1518 err = PTR_ERR(p->conn);
1527 sock_release(csocket);
1530 return ERR_PTR(err);
1533 static struct p9_trans *
1534 p9_trans_create_fd(const char *name, char *args, int msize,
1535 unsigned char extended)
1538 struct p9_trans *trans;
1539 struct p9_fd_opts opts;
1540 struct p9_trans_fd *p;
1542 parse_opts(args, &opts);
1544 if (opts.rfd == ~0 || opts.wfd == ~0) {
1545 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
1546 return ERR_PTR(-ENOPROTOOPT);
1549 trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL);
1551 return ERR_PTR(-ENOMEM);
1553 trans->rpc = p9_fd_rpc;
1554 trans->close = p9_fd_close;
1556 err = p9_fd_open(trans, opts.rfd, opts.wfd);
1560 trans->msize = msize;
1561 trans->extended = extended;
1562 p = (struct p9_trans_fd *) trans->priv;
1563 p->conn = p9_conn_create(trans);
1564 if (IS_ERR(p->conn)) {
1565 err = PTR_ERR(p->conn);
1574 return ERR_PTR(err);
1577 static struct p9_trans_module p9_tcp_trans = {
1579 .maxsize = MAX_SOCK_BUF,
1581 .create = p9_trans_create_tcp,
1582 .owner = THIS_MODULE,
1585 static struct p9_trans_module p9_unix_trans = {
1587 .maxsize = MAX_SOCK_BUF,
1589 .create = p9_trans_create_unix,
1590 .owner = THIS_MODULE,
1593 static struct p9_trans_module p9_fd_trans = {
1595 .maxsize = MAX_SOCK_BUF,
1597 .create = p9_trans_create_fd,
1598 .owner = THIS_MODULE,
1601 int p9_trans_fd_init(void)
1605 for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++)
1606 p9_mux_poll_tasks[i].task = NULL;
1608 p9_mux_wq = create_workqueue("v9fs");
1610 printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n");
1614 v9fs_register_trans(&p9_tcp_trans);
1615 v9fs_register_trans(&p9_unix_trans);
1616 v9fs_register_trans(&p9_fd_trans);
1621 void p9_trans_fd_exit(void)
1623 v9fs_unregister_trans(&p9_tcp_trans);
1624 v9fs_unregister_trans(&p9_unix_trans);
1625 v9fs_unregister_trans(&p9_fd_trans);
1627 destroy_workqueue(p9_mux_wq);