1 // SPDX-License-Identifier: GPL-2.0-only
6  *  Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
7  *  Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
8  *  Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
41  * struct p9_fd_opts - per-transport options
44  * @port: port to connect to (trans=tcp)
45  * @privport: port is privileged
49 	int rfd;
50 	int wfd;
51 	u16 port;  member
57   *  - a little lazy - parse all fd-transport options
68 	{Opt_port, "port=%u"},
89  * struct p9_conn - fd mux connection state information
90  * @mux_list: list link for mux to manage multiple connections (?)
115 	int err;
123 	int wpos;
124 	int wsize;
135  * struct p9_trans_fd - transport state
154 static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT;
155 static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT;
160 	int i;  in p9_mux_poll_stop()
162 	for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {  in p9_mux_poll_stop()
163 		struct p9_poll_wait *pwait = &m->poll_wait[i];  in p9_mux_poll_stop()
165 		if (pwait->wait_addr) {  in p9_mux_poll_stop()
166 			remove_wait_queue(pwait->wait_addr, &pwait->wait);  in p9_mux_poll_stop()
167 			pwait->wait_addr = NULL;  in p9_mux_poll_stop()
172 	list_del_init(&m->poll_pending_link);  in p9_mux_poll_stop()
179  * p9_conn_cancel - cancel all pending requests with error
180  * @m: mux data
185 static void p9_conn_cancel(struct p9_conn *m, int err)  in p9_conn_cancel()
190 	p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);  in p9_conn_cancel()
192 	spin_lock(&m->req_lock);  in p9_conn_cancel()
194 	if (m->err) {  in p9_conn_cancel()
195 		spin_unlock(&m->req_lock);  in p9_conn_cancel()
199 	m->err = err;  in p9_conn_cancel()
201 	list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {  in p9_conn_cancel()
202 		list_move(&req->req_list, &cancel_list);  in p9_conn_cancel()
203 		WRITE_ONCE(req->status, REQ_STATUS_ERROR);  in p9_conn_cancel()
205 	list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {  in p9_conn_cancel()
206 		list_move(&req->req_list, &cancel_list);  in p9_conn_cancel()
207 		WRITE_ONCE(req->status, REQ_STATUS_ERROR);  in p9_conn_cancel()
210 	spin_unlock(&m->req_lock);  in p9_conn_cancel()
214 		list_del(&req->req_list);  in p9_conn_cancel()
215 		if (!req->t_err)  in p9_conn_cancel()
216 			req->t_err = err;  in p9_conn_cancel()
217 		p9_client_cb(m->client, req, REQ_STATUS_ERROR);  in p9_conn_cancel()
222 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt, int *err)  in p9_fd_poll()
227 	if (client && client->status == Connected)  in p9_fd_poll()
228 		ts = client->trans;  in p9_fd_poll()
232 			*err = -EREMOTEIO;  in p9_fd_poll()
236 	ret = vfs_poll(ts->rd, pt);  in p9_fd_poll()
237 	if (ts->rd != ts->wr)  in p9_fd_poll()
238 		ret = (ret & ~EPOLLOUT) | (vfs_poll(ts->wr, pt) & ~EPOLLIN);  in p9_fd_poll()
243  * p9_fd_read- read from a fd
250 static int p9_fd_read(struct p9_client *client, void *v, int len)  in p9_fd_read()
252 	int ret;  in p9_fd_read()
256 	if (client && client->status != Disconnected)  in p9_fd_read()
257 		ts = client->trans;  in p9_fd_read()
260 		return -EREMOTEIO;  in p9_fd_read()
262 	if (!(ts->rd->f_flags & O_NONBLOCK))  in p9_fd_read()
265 	pos = ts->rd->f_pos;  in p9_fd_read()
266 	ret = kernel_read(ts->rd, v, len, &pos);  in p9_fd_read()
267 	if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)  in p9_fd_read()
268 		client->status = Disconnected;  in p9_fd_read()
273  * p9_read_work - called when there is some data to be read from a transport
281 	int err;  in p9_read_work()
286 	if (m->err < 0)  in p9_read_work()
289 	p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset);  in p9_read_work()
291 	if (!m->rc.sdata) {  in p9_read_work()
292 		m->rc.sdata = m->tmp_buf;  in p9_read_work()
293 		m->rc.offset = 0;  in p9_read_work()
294 		m->rc.capacity = P9_HDRSZ; /* start by reading header */  in p9_read_work()
297 	clear_bit(Rpending, &m->wsched);  in p9_read_work()
298 	p9_debug(P9_DEBUG_TRANS, "read mux %p pos %zd size: %zd = %zd\n",  in p9_read_work()
299 		 m, m->rc.offset, m->rc.capacity,  in p9_read_work()
300 		 m->rc.capacity - m->rc.offset);  in p9_read_work()
301 	err = p9_fd_read(m->client, m->rc.sdata + m->rc.offset,  in p9_read_work()
302 			 m->rc.capacity - m->rc.offset);  in p9_read_work()
303 	p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err);  in p9_read_work()
304 	if (err == -EAGAIN)  in p9_read_work()
310 	m->rc.offset += err;  in p9_read_work()
313 	if ((!m->rreq) && (m->rc.offset == m->rc.capacity)) {  in p9_read_work()
317 		m->rc.size = P9_HDRSZ;  in p9_read_work()
318 		err = p9_parse_header(&m->rc, &m->rc.size, NULL, NULL, 0);  in p9_read_work()
326 			 "mux %p pkt: size: %d bytes tag: %d\n",  in p9_read_work()
327 			 m, m->rc.size, m->rc.tag);  in p9_read_work()
329 		m->rreq = p9_tag_lookup(m->client, m->rc.tag);  in p9_read_work()
330 		if (!m->rreq || (m->rreq->status != REQ_STATUS_SENT)) {  in p9_read_work()
332 				 m->rc.tag);  in p9_read_work()
333 			err = -EIO;  in p9_read_work()
337 		if (m->rc.size > m->rreq->rc.capacity) {  in p9_read_work()
340 				 m->rc.size, m->rc.tag, m->rreq->rc.capacity);  in p9_read_work()
341 			err = -EIO;  in p9_read_work()
345 		if (!m->rreq->rc.sdata) {  in p9_read_work()
348 				 m->rc.tag, m->rreq);  in p9_read_work()
349 			p9_req_put(m->client, m->rreq);  in p9_read_work()
350 			m->rreq = NULL;  in p9_read_work()
351 			err = -EIO;  in p9_read_work()
354 		m->rc.sdata = m->rreq->rc.sdata;  in p9_read_work()
355 		memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity);  in p9_read_work()
356 		m->rc.capacity = m->rc.size;  in p9_read_work()
362 	if ((m->rreq) && (m->rc.offset == m->rc.capacity)) {  in p9_read_work()
364 		m->rreq->rc.size = m->rc.offset;  in p9_read_work()
365 		spin_lock(&m->req_lock);  in p9_read_work()
366 		if (m->rreq->status == REQ_STATUS_SENT) {  in p9_read_work()
367 			list_del(&m->rreq->req_list);  in p9_read_work()
368 			p9_client_cb(m->client, m->rreq, REQ_STATUS_RCVD);  in p9_read_work()
369 		} else if (m->rreq->status == REQ_STATUS_FLSHD) {  in p9_read_work()
374 			spin_unlock(&m->req_lock);  in p9_read_work()
377 				 m->rc.tag);  in p9_read_work()
378 			err = -EIO;  in p9_read_work()
381 		spin_unlock(&m->req_lock);  in p9_read_work()
382 		m->rc.sdata = NULL;  in p9_read_work()
383 		m->rc.offset = 0;  in p9_read_work()
384 		m->rc.capacity = 0;  in p9_read_work()
385 		p9_req_put(m->client, m->rreq);  in p9_read_work()
386 		m->rreq = NULL;  in p9_read_work()
390 	clear_bit(Rworksched, &m->wsched);  in p9_read_work()
392 	if (!list_empty(&m->req_list)) {  in p9_read_work()
393 		if (test_and_clear_bit(Rpending, &m->wsched))  in p9_read_work()
396 			n = p9_fd_poll(m->client, NULL, NULL);  in p9_read_work()
398 		if ((n & EPOLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) {  in p9_read_work()
400 			schedule_work(&m->rq);  in p9_read_work()
407 	clear_bit(Rworksched, &m->wsched);  in p9_read_work()
411  * p9_fd_write - write to a socket
418 static int p9_fd_write(struct p9_client *client, void *v, int len)  in p9_fd_write()
423 	if (client && client->status != Disconnected)  in p9_fd_write()
424 		ts = client->trans;  in p9_fd_write()
427 		return -EREMOTEIO;  in p9_fd_write()
429 	if (!(ts->wr->f_flags & O_NONBLOCK))  in p9_fd_write()
432 	ret = kernel_write(ts->wr, v, len, &ts->wr->f_pos);  in p9_fd_write()
433 	if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)  in p9_fd_write()
434 		client->status = Disconnected;  in p9_fd_write()
439  * p9_write_work - called when a transport can send some data
447 	int err;  in p9_write_work()
453 	if (m->err < 0) {  in p9_write_work()
454 		clear_bit(Wworksched, &m->wsched);  in p9_write_work()
458 	if (!m->wsize) {  in p9_write_work()
459 		spin_lock(&m->req_lock);  in p9_write_work()
460 		if (list_empty(&m->unsent_req_list)) {  in p9_write_work()
461 			clear_bit(Wworksched, &m->wsched);  in p9_write_work()
462 			spin_unlock(&m->req_lock);  in p9_write_work()
466 		req = list_entry(m->unsent_req_list.next, struct p9_req_t,  in p9_write_work()
468 		WRITE_ONCE(req->status, REQ_STATUS_SENT);  in p9_write_work()
470 		list_move_tail(&req->req_list, &m->req_list);  in p9_write_work()
472 		m->wbuf = req->tc.sdata;  in p9_write_work()
473 		m->wsize = req->tc.size;  in p9_write_work()
474 		m->wpos = 0;  in p9_write_work()
476 		m->wreq = req;  in p9_write_work()
477 		spin_unlock(&m->req_lock);  in p9_write_work()
480 	p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n",  in p9_write_work()
481 		 m, m->wpos, m->wsize);  in p9_write_work()
482 	clear_bit(Wpending, &m->wsched);  in p9_write_work()
483 	err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);  in p9_write_work()
484 	p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);  in p9_write_work()
485 	if (err == -EAGAIN)  in p9_write_work()
492 		err = -EREMOTEIO;  in p9_write_work()
496 	m->wpos += err;  in p9_write_work()
497 	if (m->wpos == m->wsize) {  in p9_write_work()
498 		m->wpos = m->wsize = 0;  in p9_write_work()
499 		p9_req_put(m->client, m->wreq);  in p9_write_work()
500 		m->wreq = NULL;  in p9_write_work()
504 	clear_bit(Wworksched, &m->wsched);  in p9_write_work()
506 	if (m->wsize || !list_empty(&m->unsent_req_list)) {  in p9_write_work()
507 		if (test_and_clear_bit(Wpending, &m->wsched))  in p9_write_work()
510 			n = p9_fd_poll(m->client, NULL, NULL);  in p9_write_work()
513 		   !test_and_set_bit(Wworksched, &m->wsched)) {  in p9_write_work()
515 			schedule_work(&m->wq);  in p9_write_work()
523 	clear_bit(Wworksched, &m->wsched);  in p9_write_work()
526 static int p9_pollwake(wait_queue_entry_t *wait, unsigned int mode, int sync, void *key)  in p9_pollwake()
530 	struct p9_conn *m = pwait->conn;  in p9_pollwake()
534 	if (list_empty(&m->poll_pending_link))  in p9_pollwake()
535 		list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);  in p9_pollwake()
543  * p9_pollwait - add poll task to the wait queue
548  * called by files poll operation to add v9fs-poll task to files wait queue
556 	int i;  in p9_pollwait()
558 	for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {  in p9_pollwait()
559 		if (m->poll_wait[i].wait_addr == NULL) {  in p9_pollwait()
560 			pwait = &m->poll_wait[i];  in p9_pollwait()
570 	pwait->conn = m;  in p9_pollwait()
571 	pwait->wait_addr = wait_address;  in p9_pollwait()
572 	init_waitqueue_func_entry(&pwait->wait, p9_pollwake);  in p9_pollwait()
573 	add_wait_queue(wait_address, &pwait->wait);  in p9_pollwait()
577  * p9_conn_create - initialize the per-session mux data
586 	struct p9_trans_fd *ts = client->trans;  in p9_conn_create()
587 	struct p9_conn *m = &ts->conn;  in p9_conn_create()
589 	p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize);  in p9_conn_create()
591 	INIT_LIST_HEAD(&m->mux_list);  in p9_conn_create()
592 	m->client = client;  in p9_conn_create()
594 	spin_lock_init(&m->req_lock);  in p9_conn_create()
595 	INIT_LIST_HEAD(&m->req_list);  in p9_conn_create()
596 	INIT_LIST_HEAD(&m->unsent_req_list);  in p9_conn_create()
597 	INIT_WORK(&m->rq, p9_read_work);  in p9_conn_create()
598 	INIT_WORK(&m->wq, p9_write_work);  in p9_conn_create()
599 	INIT_LIST_HEAD(&m->poll_pending_link);  in p9_conn_create()
600 	init_poll_funcptr(&m->pt, p9_pollwait);  in p9_conn_create()
602 	n = p9_fd_poll(client, &m->pt, NULL);  in p9_conn_create()
604 		p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);  in p9_conn_create()
605 		set_bit(Rpending, &m->wsched);  in p9_conn_create()
609 		p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);  in p9_conn_create()
610 		set_bit(Wpending, &m->wsched);  in p9_conn_create()
615  * p9_poll_mux - polls a mux and schedules read or write works if necessary
623 	int err = -ECONNRESET;  in p9_poll_mux()
625 	if (m->err < 0)  in p9_poll_mux()
628 	n = p9_fd_poll(m->client, NULL, &err);  in p9_poll_mux()
630 		p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);  in p9_poll_mux()
635 		set_bit(Rpending, &m->wsched);  in p9_poll_mux()
636 		p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);  in p9_poll_mux()
637 		if (!test_and_set_bit(Rworksched, &m->wsched)) {  in p9_poll_mux()
639 			schedule_work(&m->rq);  in p9_poll_mux()
644 		set_bit(Wpending, &m->wsched);  in p9_poll_mux()
645 		p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);  in p9_poll_mux()
646 		if ((m->wsize || !list_empty(&m->unsent_req_list)) &&  in p9_poll_mux()
647 		    !test_and_set_bit(Wworksched, &m->wsched)) {  in p9_poll_mux()
649 			schedule_work(&m->wq);  in p9_poll_mux()
655  * p9_fd_request - send 9P request
665 static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)  in p9_fd_request()
668 	struct p9_trans_fd *ts = client->trans;  in p9_fd_request()
669 	struct p9_conn *m = &ts->conn;  in p9_fd_request()
671 	p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n",  in p9_fd_request()
672 		 m, current, &req->tc, req->tc.id);  in p9_fd_request()
674 	spin_lock(&m->req_lock);  in p9_fd_request()
676 	if (m->err < 0) {  in p9_fd_request()
677 		spin_unlock(&m->req_lock);  in p9_fd_request()
678 		return m->err;  in p9_fd_request()
681 	WRITE_ONCE(req->status, REQ_STATUS_UNSENT);  in p9_fd_request()
682 	list_add_tail(&req->req_list, &m->unsent_req_list);  in p9_fd_request()
683 	spin_unlock(&m->req_lock);  in p9_fd_request()
685 	if (test_and_clear_bit(Wpending, &m->wsched))  in p9_fd_request()
688 		n = p9_fd_poll(m->client, NULL, NULL);  in p9_fd_request()
690 	if (n & EPOLLOUT && !test_and_set_bit(Wworksched, &m->wsched))  in p9_fd_request()
691 		schedule_work(&m->wq);  in p9_fd_request()
696 static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)  in p9_fd_cancel()
698 	struct p9_trans_fd *ts = client->trans;  in p9_fd_cancel()
699 	struct p9_conn *m = &ts->conn;  in p9_fd_cancel()
700 	int ret = 1;  in p9_fd_cancel()
704 	spin_lock(&m->req_lock);  in p9_fd_cancel()
706 	if (req->status == REQ_STATUS_UNSENT) {  in p9_fd_cancel()
707 		list_del(&req->req_list);  in p9_fd_cancel()
708 		WRITE_ONCE(req->status, REQ_STATUS_FLSHD);  in p9_fd_cancel()
712 	spin_unlock(&m->req_lock);  in p9_fd_cancel()
717 static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req)  in p9_fd_cancelled()
719 	struct p9_trans_fd *ts = client->trans;  in p9_fd_cancelled()
720 	struct p9_conn *m = &ts->conn;  in p9_fd_cancelled()
724 	spin_lock(&m->req_lock);  in p9_fd_cancelled()
728 	if (req->status == REQ_STATUS_RCVD) {  in p9_fd_cancelled()
729 		spin_unlock(&m->req_lock);  in p9_fd_cancelled()
736 	list_del(&req->req_list);  in p9_fd_cancelled()
737 	WRITE_ONCE(req->status, REQ_STATUS_FLSHD);  in p9_fd_cancelled()
738 	spin_unlock(&m->req_lock);  in p9_fd_cancelled()
745 static int p9_fd_show_options(struct seq_file *m, struct p9_client *clnt)  in p9_fd_show_options()
747 	if (clnt->trans_mod == &p9_tcp_trans) {  in p9_fd_show_options()
748 		if (clnt->trans_opts.tcp.port != P9_PORT)  in p9_fd_show_options()
749 			seq_printf(m, ",port=%u", clnt->trans_opts.tcp.port);  in p9_fd_show_options()
750 	} else if (clnt->trans_mod == &p9_fd_trans) {  in p9_fd_show_options()
751 		if (clnt->trans_opts.fd.rfd != ~0)  in p9_fd_show_options()
752 			seq_printf(m, ",rfd=%u", clnt->trans_opts.fd.rfd);  in p9_fd_show_options()
753 		if (clnt->trans_opts.fd.wfd != ~0)  in p9_fd_show_options()
754 			seq_printf(m, ",wfd=%u", clnt->trans_opts.fd.wfd);  in p9_fd_show_options()
760  * parse_opts - parse mount options into p9_fd_opts structure
762  * @opts: fd transport-specific structure to parse options into
764  * Returns 0 upon success, -ERRNO upon failure
767 static int parse_opts(char *params, struct p9_fd_opts *opts)  in parse_opts()
771 	int option;  in parse_opts()
774 	opts->port = P9_PORT;  in parse_opts()
775 	opts->rfd = ~0;  in parse_opts()
776 	opts->wfd = ~0;  in parse_opts()
777 	opts->privport = false;  in parse_opts()
786 		return -ENOMEM;  in parse_opts()
791 		int token;  in parse_opts()
792 		int r;  in parse_opts()
806 			opts->port = option;  in parse_opts()
809 			opts->rfd = option;  in parse_opts()
812 			opts->wfd = option;  in parse_opts()
815 			opts->privport = true;  in parse_opts()
826 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)  in p9_fd_open()
831 		return -ENOMEM;  in p9_fd_open()
833 	ts->rd = fget(rfd);  in p9_fd_open()
834 	if (!ts->rd)  in p9_fd_open()
836 	if (!(ts->rd->f_mode & FMODE_READ))  in p9_fd_open()
846 	data_race(ts->rd->f_flags |= O_NONBLOCK);  in p9_fd_open()
847 	ts->wr = fget(wfd);  in p9_fd_open()
848 	if (!ts->wr)  in p9_fd_open()
850 	if (!(ts->wr->f_mode & FMODE_WRITE))  in p9_fd_open()
852 	data_race(ts->wr->f_flags |= O_NONBLOCK);  in p9_fd_open()
854 	client->trans = ts;  in p9_fd_open()
855 	client->status = Connected;  in p9_fd_open()
860 	fput(ts->wr);  in p9_fd_open()
862 	fput(ts->rd);  in p9_fd_open()
865 	return -EIO;  in p9_fd_open()
868 static int p9_socket_open(struct p9_client *client, struct socket *csocket)  in p9_socket_open()
876 		return -ENOMEM;  in p9_socket_open()
879 	csocket->sk->sk_allocation = GFP_NOIO;  in p9_socket_open()
880 	csocket->sk->sk_use_task_frag = false;  in p9_socket_open()
890 	p->wr = p->rd = file;  in p9_socket_open()
891 	client->trans = p;  in p9_socket_open()
892 	client->status = Connected;  in p9_socket_open()
894 	p->rd->f_flags |= O_NONBLOCK;  in p9_socket_open()
901  * p9_conn_destroy - cancels all pending requests of mux
902  * @m: mux to destroy
908 	p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n",  in p9_conn_destroy()
909 		 m, m->mux_list.prev, m->mux_list.next);  in p9_conn_destroy()
912 	cancel_work_sync(&m->rq);  in p9_conn_destroy()
913 	if (m->rreq) {  in p9_conn_destroy()
914 		p9_req_put(m->client, m->rreq);  in p9_conn_destroy()
915 		m->rreq = NULL;  in p9_conn_destroy()
917 	cancel_work_sync(&m->wq);  in p9_conn_destroy()
918 	if (m->wreq) {  in p9_conn_destroy()
919 		p9_req_put(m->client, m->wreq);  in p9_conn_destroy()
920 		m->wreq = NULL;  in p9_conn_destroy()
923 	p9_conn_cancel(m, -ECONNRESET);  in p9_conn_destroy()
925 	m->client = NULL;  in p9_conn_destroy()
929  * p9_fd_close - shutdown file descriptor transport
941 	ts = client->trans;  in p9_fd_close()
945 	client->status = Disconnected;  in p9_fd_close()
947 	p9_conn_destroy(&ts->conn);  in p9_fd_close()
949 	if (ts->rd)  in p9_fd_close()
950 		fput(ts->rd);  in p9_fd_close()
951 	if (ts->wr)  in p9_fd_close()
952 		fput(ts->wr);  in p9_fd_close()
958  * stolen from NFS - maybe should be made a generic function?
960 static inline int valid_ipaddr4(const char *buf)  in valid_ipaddr4()
962 	int rc, count, in[4];  in valid_ipaddr4()
966 		return -EINVAL;  in valid_ipaddr4()
969 			return -EINVAL;  in valid_ipaddr4()
974 static int p9_bind_privport(struct socket *sock)  in p9_bind_privport()
977 	int port, err = -EINVAL;  in p9_bind_privport()  local
982 	for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) {  in p9_bind_privport()
983 		cl.sin_port = htons((ushort)port);  in p9_bind_privport()
985 		if (err != -EADDRINUSE)  in p9_bind_privport()
992 static int
995 	int err;  in p9_fd_create_tcp()
1005 		return -EINVAL;  in p9_fd_create_tcp()
1009 	client->trans_opts.tcp.port = opts.port;  in p9_fd_create_tcp()
1010 	client->trans_opts.tcp.privport = opts.privport;  in p9_fd_create_tcp()
1013 	sin_server.sin_port = htons(opts.port);  in p9_fd_create_tcp()
1014 	err = __sock_create(current->nsproxy->net_ns, PF_INET,  in p9_fd_create_tcp()
1032 	err = READ_ONCE(csocket->ops)->connect(csocket,  in p9_fd_create_tcp()
1045 static int
1048 	int err;  in p9_fd_create_unix()
1055 		return -EINVAL;  in p9_fd_create_unix()
1060 		return -ENAMETOOLONG;  in p9_fd_create_unix()
1065 	err = __sock_create(current->nsproxy->net_ns, PF_UNIX,  in p9_fd_create_unix()
1073 	err = READ_ONCE(csocket->ops)->connect(csocket, (struct sockaddr *)&sun_server,  in p9_fd_create_unix()
1074 			sizeof(struct sockaddr_un) - 1, 0);  in p9_fd_create_unix()
1085 static int
1088 	int err;  in p9_fd_create()
1094 	client->trans_opts.fd.rfd = opts.rfd;  in p9_fd_create()
1095 	client->trans_opts.fd.wfd = opts.wfd;  in p9_fd_create()
1099 		return -ENOPROTOOPT;  in p9_fd_create()
1155  * p9_poll_workfn - poll worker thread
1174 		list_del_init(&conn->poll_pending_link);  in p9_poll_workfn()
1186 static int __init p9_trans_fd_init(void)  in p9_trans_fd_init()