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
128 struct p9_fcall *tcall;
129 struct p9_fcall *rcall;
131 p9_conn_req_callback cb;
134 struct list_head req_list;
137 struct p9_poll_wait {
138 struct p9_conn *conn;
140 wait_queue_head_t *wait_addr;
144 * struct p9_conn - fd mux connection state information
145 * @lock: protects mux_list (?)
146 * @mux_list: list link for mux to manage multiple connections (?)
147 * @client: reference to client instance for this connection
148 * @tagpool: id accounting for transactions
150 * @req_list: accounting for requests which have been sent
151 * @unsent_req_list: accounting for requests that haven't been sent
152 * @rcall: current response &p9_fcall structure
153 * @rpos: read position in current frame
154 * @rbuf: current read buffer
155 * @wpos: write position for current frame
156 * @wsize: amount of data to write for current frame
157 * @wbuf: current write buffer
158 * @poll_wait: array of wait_q's for various worker threads
161 * @rq: current read work
162 * @wq: current write work
168 spinlock_t lock; /* protect lock structure */
169 struct list_head mux_list;
170 struct p9_client *client;
171 struct p9_idpool *tagpool;
173 struct list_head req_list;
174 struct list_head unsent_req_list;
175 struct p9_fcall *rcall;
181 struct list_head poll_pending_link;
182 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
184 struct work_struct rq;
185 struct work_struct wq;
186 unsigned long wsched;
190 * struct p9_mux_rpc - fd mux rpc accounting structure
191 * @m: connection this request was issued on
193 * @tcall: request &p9_fcall
194 * @rcall: response &p9_fcall
195 * @wqueue: wait queue that client is blocked on for this rpc
197 * Bug: isn't this information duplicated elsewhere like &p9_req
203 struct p9_fcall *tcall;
204 struct p9_fcall *rcall;
205 wait_queue_head_t wqueue;
208 static DEFINE_SPINLOCK(p9_poll_lock);
209 static LIST_HEAD(p9_poll_pending_list);
210 static struct workqueue_struct *p9_mux_wq;
211 static struct task_struct *p9_poll_task;
213 static u16 p9_mux_get_tag(struct p9_conn *m)
217 tag = p9_idpool_get(m->tagpool);
224 static void p9_mux_put_tag(struct p9_conn *m, u16 tag)
226 if (tag != P9_NOTAG && p9_idpool_check(tag, m->tagpool))
227 p9_idpool_put(tag, m->tagpool);
230 static void p9_mux_poll_stop(struct p9_conn *m)
235 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
236 struct p9_poll_wait *pwait = &m->poll_wait[i];
238 if (pwait->wait_addr) {
239 remove_wait_queue(pwait->wait_addr, &pwait->wait);
240 pwait->wait_addr = NULL;
244 spin_lock_irqsave(&p9_poll_lock, flags);
245 list_del_init(&m->poll_pending_link);
246 spin_unlock_irqrestore(&p9_poll_lock, flags);
250 * p9_conn_cancel - cancel all pending requests with error
256 void p9_conn_cancel(struct p9_conn *m, int err)
258 struct p9_req *req, *rtmp;
259 LIST_HEAD(cancel_list);
261 P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
264 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
265 list_move(&req->req_list, &cancel_list);
267 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
268 list_move(&req->req_list, &cancel_list);
270 spin_unlock(&m->lock);
272 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
273 list_del(&req->req_list);
278 (*req->cb) (req, req->cba);
284 static void process_request(struct p9_conn *m, struct p9_req *req)
287 struct p9_str *ename;
289 if (!req->err && req->rcall->id == P9_RERROR) {
290 ecode = req->rcall->params.rerror.errno;
291 ename = &req->rcall->params.rerror.error;
293 P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len,
300 req->err = p9_errstr2errno(ename->str, ename->len);
302 /* string match failed */
304 PRINT_FCALL_ERROR("unknown error", req->rcall);
305 req->err = -ESERVERFAULT;
308 } else if (req->tcall && req->rcall->id != req->tcall->id + 1) {
309 P9_DPRINTK(P9_DEBUG_ERROR,
310 "fcall mismatch: expected %d, got %d\n",
311 req->tcall->id + 1, req->rcall->id);
318 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
321 struct p9_trans_fd *ts = NULL;
323 if (client && client->status == Connected)
329 if (!ts->rd->f_op || !ts->rd->f_op->poll)
332 if (!ts->wr->f_op || !ts->wr->f_op->poll)
335 ret = ts->rd->f_op->poll(ts->rd, pt);
339 if (ts->rd != ts->wr) {
340 n = ts->wr->f_op->poll(ts->wr, pt);
343 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
350 * p9_fd_read- read from a fd
351 * @client: client instance
352 * @v: buffer to receive data into
353 * @len: size of receive buffer
357 static int p9_fd_read(struct p9_client *client, void *v, int len)
360 struct p9_trans_fd *ts = NULL;
362 if (client && client->status != Disconnected)
368 if (!(ts->rd->f_flags & O_NONBLOCK))
369 P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
371 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
372 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
373 client->status = Disconnected;
378 * p9_read_work - called when there is some data to be read from a transport
379 * @work: container of work to be done
383 static void p9_read_work(struct work_struct *work)
387 struct p9_req *req, *rptr, *rreq;
388 struct p9_fcall *rcall;
391 m = container_of(work, struct p9_conn, rq);
397 P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
401 kmalloc(sizeof(struct p9_fcall) + m->client->msize,
408 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
412 clear_bit(Rpending, &m->wsched);
413 err = p9_fd_read(m->client, m->rbuf + m->rpos,
414 m->client->msize - m->rpos);
415 P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err);
416 if (err == -EAGAIN) {
417 clear_bit(Rworksched, &m->wsched);
425 while (m->rpos > 4) {
426 n = le32_to_cpu(*(__le32 *) m->rbuf);
427 if (n >= m->client->msize) {
428 P9_DPRINTK(P9_DEBUG_ERROR,
429 "requested packet size too big: %d\n", n);
438 p9_deserialize_fcall(m->rbuf, n, m->rcall, m->client->dotu);
442 #ifdef CONFIG_NET_9P_DEBUG
443 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
446 p9_printfcall(buf, sizeof(buf), m->rcall,
448 printk(KERN_NOTICE ">>> %p %s\n", m, buf);
455 m->rcall = kmalloc(sizeof(struct p9_fcall) +
456 m->client->msize, GFP_KERNEL);
462 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
463 memmove(m->rbuf, rbuf + n, m->rpos - n);
471 P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m,
472 rcall->id, rcall->tag);
476 list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
477 if (rreq->tag == rcall->tag) {
479 if (req->flush != Flushing)
480 list_del(&req->req_list);
484 spin_unlock(&m->lock);
488 process_request(m, req);
490 if (req->flush != Flushing) {
492 (*req->cb) (req, req->cba);
497 if (err >= 0 && rcall->id != P9_RFLUSH)
498 P9_DPRINTK(P9_DEBUG_ERROR,
499 "unexpected response mux %p id %d tag %d\n",
500 m, rcall->id, rcall->tag);
505 if (!list_empty(&m->req_list)) {
506 if (test_and_clear_bit(Rpending, &m->wsched))
509 n = p9_fd_poll(m->client, NULL);
512 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
513 queue_work(p9_mux_wq, &m->rq);
515 clear_bit(Rworksched, &m->wsched);
517 clear_bit(Rworksched, &m->wsched);
522 p9_conn_cancel(m, err);
523 clear_bit(Rworksched, &m->wsched);
527 * p9_fd_write - write to a socket
528 * @client: client instance
529 * @v: buffer to send data from
530 * @len: size of send buffer
534 static int p9_fd_write(struct p9_client *client, void *v, int len)
538 struct p9_trans_fd *ts = NULL;
540 if (client && client->status != Disconnected)
546 if (!(ts->wr->f_flags & O_NONBLOCK))
547 P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
551 /* The cast to a user pointer is valid due to the set_fs() */
552 ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos);
555 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
556 client->status = Disconnected;
561 * p9_write_work - called when a transport can send some data
562 * @work: container for work to be done
566 static void p9_write_work(struct work_struct *work)
572 m = container_of(work, struct p9_conn, wq);
575 clear_bit(Wworksched, &m->wsched);
580 if (list_empty(&m->unsent_req_list)) {
581 clear_bit(Wworksched, &m->wsched);
587 req = list_entry(m->unsent_req_list.next, struct p9_req,
589 list_move_tail(&req->req_list, &m->req_list);
590 if (req->err == ERREQFLUSH)
593 m->wbuf = req->tcall->sdata;
594 m->wsize = req->tcall->size;
596 spin_unlock(&m->lock);
599 P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos,
601 clear_bit(Wpending, &m->wsched);
602 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
603 P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err);
604 if (err == -EAGAIN) {
605 clear_bit(Wworksched, &m->wsched);
617 if (m->wpos == m->wsize)
618 m->wpos = m->wsize = 0;
620 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
621 if (test_and_clear_bit(Wpending, &m->wsched))
624 n = p9_fd_poll(m->client, NULL);
627 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
628 queue_work(p9_mux_wq, &m->wq);
630 clear_bit(Wworksched, &m->wsched);
632 clear_bit(Wworksched, &m->wsched);
637 p9_conn_cancel(m, err);
638 clear_bit(Wworksched, &m->wsched);
641 static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key)
643 struct p9_poll_wait *pwait =
644 container_of(wait, struct p9_poll_wait, wait);
645 struct p9_conn *m = pwait->conn;
647 DECLARE_WAITQUEUE(dummy_wait, p9_poll_task);
649 spin_lock_irqsave(&p9_poll_lock, flags);
650 if (list_empty(&m->poll_pending_link))
651 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
652 spin_unlock_irqrestore(&p9_poll_lock, flags);
654 /* perform the default wake up operation */
655 return default_wake_function(&dummy_wait, mode, sync, key);
659 * p9_pollwait - add poll task to the wait queue
660 * @filp: file pointer being polled
661 * @wait_address: wait_q to block on
664 * called by files poll operation to add v9fs-poll task to files wait queue
668 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
670 struct p9_conn *m = container_of(p, struct p9_conn, pt);
671 struct p9_poll_wait *pwait = NULL;
674 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
675 if (m->poll_wait[i].wait_addr == NULL) {
676 pwait = &m->poll_wait[i];
682 P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
687 P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n");
688 pwait->wait_addr = ERR_PTR(-EIO);
693 pwait->wait_addr = wait_address;
694 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
695 add_wait_queue(wait_address, &pwait->wait);
699 * p9_conn_create - allocate and initialize the per-session mux data
700 * @client: client instance
702 * Note: Creates the polling task if this is the first session.
705 static struct p9_conn *p9_conn_create(struct p9_client *client)
710 P9_DPRINTK(P9_DEBUG_MUX, "client %p msize %d\n", client, client->msize);
711 m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
713 return ERR_PTR(-ENOMEM);
715 spin_lock_init(&m->lock);
716 INIT_LIST_HEAD(&m->mux_list);
718 m->tagpool = p9_idpool_create();
719 if (IS_ERR(m->tagpool)) {
721 return ERR_PTR(-ENOMEM);
724 INIT_LIST_HEAD(&m->req_list);
725 INIT_LIST_HEAD(&m->unsent_req_list);
726 INIT_WORK(&m->rq, p9_read_work);
727 INIT_WORK(&m->wq, p9_write_work);
728 INIT_LIST_HEAD(&m->poll_pending_link);
729 init_poll_funcptr(&m->pt, p9_pollwait);
731 n = p9_fd_poll(client, &m->pt);
733 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
734 set_bit(Rpending, &m->wsched);
738 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
739 set_bit(Wpending, &m->wsched);
742 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
743 if (IS_ERR(m->poll_wait[i].wait_addr)) {
746 /* return the error code */
747 return (void *)m->poll_wait[i].wait_addr;
755 * p9_poll_mux - polls a mux and schedules read or write works if necessary
756 * @m: connection to poll
760 static void p9_poll_mux(struct p9_conn *m)
767 n = p9_fd_poll(m->client, NULL);
768 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
769 P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n);
772 p9_conn_cancel(m, n);
776 set_bit(Rpending, &m->wsched);
777 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
778 if (!test_and_set_bit(Rworksched, &m->wsched)) {
779 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
780 queue_work(p9_mux_wq, &m->rq);
785 set_bit(Wpending, &m->wsched);
786 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
787 if ((m->wsize || !list_empty(&m->unsent_req_list))
788 && !test_and_set_bit(Wworksched, &m->wsched)) {
789 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
790 queue_work(p9_mux_wq, &m->wq);
796 * p9_send_request - send 9P request
797 * The function can sleep until the request is scheduled for sending.
798 * The function can be interrupted. Return from the function is not
799 * a guarantee that the request is sent successfully. Can return errors
800 * that can be retrieved by PTR_ERR macros.
803 * @tc: request to be sent
804 * @cb: callback function to call when response is received
805 * @cba: parameter to pass to the callback function
809 static struct p9_req *p9_send_request(struct p9_conn *m,
811 p9_conn_req_callback cb, void *cba)
816 P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current,
819 return ERR_PTR(m->err);
821 req = kmalloc(sizeof(struct p9_req), GFP_KERNEL);
823 return ERR_PTR(-ENOMEM);
825 if (tc->id == P9_TVERSION)
828 n = p9_mux_get_tag(m);
832 return ERR_PTR(-ENOMEM);
837 #ifdef CONFIG_NET_9P_DEBUG
838 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
841 p9_printfcall(buf, sizeof(buf), tc, m->client->dotu);
842 printk(KERN_NOTICE "<<< %p %s\n", m, buf);
846 spin_lock_init(&req->lock);
856 list_add_tail(&req->req_list, &m->unsent_req_list);
857 spin_unlock(&m->lock);
859 if (test_and_clear_bit(Wpending, &m->wsched))
862 n = p9_fd_poll(m->client, NULL);
864 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
865 queue_work(p9_mux_wq, &m->wq);
870 static void p9_mux_free_request(struct p9_conn *m, struct p9_req *req)
872 p9_mux_put_tag(m, req->tag);
876 static void p9_mux_flush_cb(struct p9_req *freq, void *a)
880 struct p9_req *req, *rreq, *rptr;
883 P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m,
884 freq->tcall, freq->rcall, freq->err,
885 freq->tcall->params.tflush.oldtag);
888 tag = freq->tcall->params.tflush.oldtag;
890 list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
891 if (rreq->tag == tag) {
893 list_del(&req->req_list);
897 spin_unlock(&m->lock);
900 spin_lock(&req->lock);
901 req->flush = Flushed;
902 spin_unlock(&req->lock);
905 (*req->cb) (req, req->cba);
912 p9_mux_free_request(m, freq);
916 p9_mux_flush_request(struct p9_conn *m, struct p9_req *req)
919 struct p9_req *rreq, *rptr;
921 P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag);
923 /* if a response was received for a request, do nothing */
924 spin_lock(&req->lock);
925 if (req->rcall || req->err) {
926 spin_unlock(&req->lock);
927 P9_DPRINTK(P9_DEBUG_MUX,
928 "mux %p req %p response already received\n", m, req);
932 req->flush = Flushing;
933 spin_unlock(&req->lock);
936 /* if the request is not sent yet, just remove it from the list */
937 list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) {
938 if (rreq->tag == req->tag) {
939 P9_DPRINTK(P9_DEBUG_MUX,
940 "mux %p req %p request is not sent yet\n", m, req);
941 list_del(&rreq->req_list);
942 req->flush = Flushed;
943 spin_unlock(&m->lock);
945 (*req->cb) (req, req->cba);
949 spin_unlock(&m->lock);
951 clear_thread_flag(TIF_SIGPENDING);
952 fc = p9_create_tflush(req->tag);
953 p9_send_request(m, fc, p9_mux_flush_cb, m);
958 p9_conn_rpc_cb(struct p9_req *req, void *a)
960 struct p9_mux_rpc *r;
962 P9_DPRINTK(P9_DEBUG_MUX, "req %p r %p\n", req, a);
964 r->rcall = req->rcall;
967 if (req->flush != None && !req->err)
968 r->err = -ERESTARTSYS;
974 * p9_fd_rpc- sends 9P request and waits until a response is available.
975 * The function can be interrupted.
976 * @client: client instance
977 * @tc: request to be sent
978 * @rc: pointer where a pointer to the response is stored
983 p9_fd_rpc(struct p9_client *client, struct p9_fcall *tc, struct p9_fcall **rc)
985 struct p9_trans_fd *p = client->trans;
986 struct p9_conn *m = p->conn;
996 init_waitqueue_head(&r.wqueue);
1002 if (signal_pending(current)) {
1004 clear_thread_flag(TIF_SIGPENDING);
1007 req = p9_send_request(m, tc, p9_conn_rpc_cb, &r);
1010 P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err);
1014 err = wait_event_interruptible(r.wqueue, r.rcall != NULL || r.err < 0);
1018 if (err == -ERESTARTSYS && client->status == Connected
1020 if (p9_mux_flush_request(m, req)) {
1021 /* wait until we get response of the flush message */
1023 clear_thread_flag(TIF_SIGPENDING);
1024 err = wait_event_interruptible(r.wqueue,
1026 } while (!r.rcall && !r.err && err == -ERESTARTSYS &&
1027 client->status == Connected && !m->err);
1035 spin_lock_irqsave(¤t->sighand->siglock, flags);
1036 recalc_sigpending();
1037 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
1045 p9_mux_free_request(m, req);
1053 * parse_options - parse mount options into session structure
1054 * @options: options string passed from mount
1055 * @opts: transport-specific structure to parse options into
1057 * Returns 0 upon success, -ERRNO upon failure
1060 static int parse_opts(char *params, struct p9_fd_opts *opts)
1063 substring_t args[MAX_OPT_ARGS];
1068 opts->port = P9_PORT;
1075 options = kstrdup(params, GFP_KERNEL);
1077 P9_DPRINTK(P9_DEBUG_ERROR,
1078 "failed to allocate copy of option string\n");
1082 while ((p = strsep(&options, ",")) != NULL) {
1087 token = match_token(p, tokens, args);
1088 r = match_int(&args[0], &option);
1090 P9_DPRINTK(P9_DEBUG_ERROR,
1091 "integer field, but no integer?\n");
1097 opts->port = option;
1113 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
1115 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
1122 if (!ts->rd || !ts->wr) {
1132 client->status = Connected;
1137 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
1141 csocket->sk->sk_allocation = GFP_NOIO;
1142 fd = sock_map_fd(csocket, 0);
1144 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
1148 ret = p9_fd_open(client, fd, fd);
1150 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n");
1151 sockfd_put(csocket);
1155 ((struct p9_trans_fd *)client->trans)->rd->f_flags |= O_NONBLOCK;
1161 * p9_mux_destroy - cancels all pending requests and frees mux resources
1162 * @m: mux to destroy
1166 static void p9_conn_destroy(struct p9_conn *m)
1168 P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m,
1169 m->mux_list.prev, m->mux_list.next);
1171 p9_mux_poll_stop(m);
1172 cancel_work_sync(&m->rq);
1173 cancel_work_sync(&m->wq);
1175 p9_conn_cancel(m, -ECONNRESET);
1178 p9_idpool_destroy(m->tagpool);
1183 * p9_fd_close - shutdown file descriptor transport
1184 * @client: client instance
1188 static void p9_fd_close(struct p9_client *client)
1190 struct p9_trans_fd *ts;
1199 client->status = Disconnected;
1201 p9_conn_destroy(ts->conn);
1212 * stolen from NFS - maybe should be made a generic function?
1214 static inline int valid_ipaddr4(const char *buf)
1216 int rc, count, in[4];
1218 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
1221 for (count = 0; count < 4; count++) {
1222 if (in[count] > 255)
1229 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
1232 struct socket *csocket;
1233 struct sockaddr_in sin_server;
1234 struct p9_fd_opts opts;
1235 struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
1237 err = parse_opts(args, &opts);
1241 if (valid_ipaddr4(addr) < 0)
1246 sin_server.sin_family = AF_INET;
1247 sin_server.sin_addr.s_addr = in_aton(addr);
1248 sin_server.sin_port = htons(opts.port);
1249 sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
1252 P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n");
1257 err = csocket->ops->connect(csocket,
1258 (struct sockaddr *)&sin_server,
1259 sizeof(struct sockaddr_in), 0);
1261 P9_EPRINTK(KERN_ERR,
1262 "p9_trans_tcp: problem connecting socket to %s\n",
1267 err = p9_socket_open(client, csocket);
1271 p = (struct p9_trans_fd *) client->trans;
1272 p->conn = p9_conn_create(client);
1273 if (IS_ERR(p->conn)) {
1274 err = PTR_ERR(p->conn);
1283 sock_release(csocket);
1291 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
1294 struct socket *csocket;
1295 struct sockaddr_un sun_server;
1296 struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */
1300 if (strlen(addr) > UNIX_PATH_MAX) {
1301 P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
1303 err = -ENAMETOOLONG;
1307 sun_server.sun_family = PF_UNIX;
1308 strcpy(sun_server.sun_path, addr);
1309 sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
1310 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1311 sizeof(struct sockaddr_un) - 1, 0);
1313 P9_EPRINTK(KERN_ERR,
1314 "p9_trans_unix: problem connecting socket: %s: %d\n",
1319 err = p9_socket_open(client, csocket);
1323 p = (struct p9_trans_fd *) client->trans;
1324 p->conn = p9_conn_create(client);
1325 if (IS_ERR(p->conn)) {
1326 err = PTR_ERR(p->conn);
1335 sock_release(csocket);
1342 p9_fd_create(struct p9_client *client, const char *addr, char *args)
1345 struct p9_fd_opts opts;
1346 struct p9_trans_fd *p = NULL; /* this get allocated in p9_fd_open */
1348 parse_opts(args, &opts);
1350 if (opts.rfd == ~0 || opts.wfd == ~0) {
1351 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
1352 return -ENOPROTOOPT;
1355 err = p9_fd_open(client, opts.rfd, opts.wfd);
1359 p = (struct p9_trans_fd *) client->trans;
1360 p->conn = p9_conn_create(client);
1361 if (IS_ERR(p->conn)) {
1362 err = PTR_ERR(p->conn);
1374 static struct p9_trans_module p9_tcp_trans = {
1376 .maxsize = MAX_SOCK_BUF,
1378 .create = p9_fd_create_tcp,
1379 .close = p9_fd_close,
1381 .owner = THIS_MODULE,
1384 static struct p9_trans_module p9_unix_trans = {
1386 .maxsize = MAX_SOCK_BUF,
1388 .create = p9_fd_create_unix,
1389 .close = p9_fd_close,
1391 .owner = THIS_MODULE,
1394 static struct p9_trans_module p9_fd_trans = {
1396 .maxsize = MAX_SOCK_BUF,
1398 .create = p9_fd_create,
1399 .close = p9_fd_close,
1401 .owner = THIS_MODULE,
1405 * p9_poll_proc - poll worker thread
1406 * @a: thread state and arguments
1408 * polls all v9fs transports for new events and queues the appropriate
1409 * work to the work queue
1413 static int p9_poll_proc(void *a)
1415 unsigned long flags;
1417 P9_DPRINTK(P9_DEBUG_MUX, "start %p\n", current);
1419 spin_lock_irqsave(&p9_poll_lock, flags);
1420 while (!list_empty(&p9_poll_pending_list)) {
1421 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1424 list_del_init(&conn->poll_pending_link);
1425 spin_unlock_irqrestore(&p9_poll_lock, flags);
1429 spin_lock_irqsave(&p9_poll_lock, flags);
1431 spin_unlock_irqrestore(&p9_poll_lock, flags);
1433 set_current_state(TASK_INTERRUPTIBLE);
1434 if (list_empty(&p9_poll_pending_list)) {
1435 P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n");
1438 __set_current_state(TASK_RUNNING);
1440 if (!kthread_should_stop())
1443 P9_DPRINTK(P9_DEBUG_MUX, "finish\n");
1447 int p9_trans_fd_init(void)
1449 p9_mux_wq = create_workqueue("v9fs");
1451 printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n");
1455 p9_poll_task = kthread_run(p9_poll_proc, NULL, "v9fs-poll");
1456 if (IS_ERR(p9_poll_task)) {
1457 destroy_workqueue(p9_mux_wq);
1458 printk(KERN_WARNING "v9fs: mux: creating poll task failed\n");
1459 return PTR_ERR(p9_poll_task);
1462 v9fs_register_trans(&p9_tcp_trans);
1463 v9fs_register_trans(&p9_unix_trans);
1464 v9fs_register_trans(&p9_fd_trans);
1469 void p9_trans_fd_exit(void)
1471 kthread_stop(p9_poll_task);
1472 v9fs_unregister_trans(&p9_tcp_trans);
1473 v9fs_unregister_trans(&p9_unix_trans);
1474 v9fs_unregister_trans(&p9_fd_trans);
1476 destroy_workqueue(p9_mux_wq);