blob: be1cb909d8c00e5e9cac2a910fa2d8f793249779 [file] [log] [blame]
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05001/*
2 * linux/fs/9p/trans_fd.c
3 *
4 * Fd transport layer. Includes deprecated socket layer.
5 *
6 * Copyright (C) 2006 by Russ Cox <rsc@swtch.com>
7 * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06008 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -05009 * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
10 *
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.
14 *
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.
19 *
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
25 *
26 */
27
28#include <linux/in.h>
29#include <linux/module.h>
30#include <linux/net.h>
31#include <linux/ipv6.h>
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060032#include <linux/kthread.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050033#include <linux/errno.h>
34#include <linux/kernel.h>
35#include <linux/un.h>
36#include <linux/uaccess.h>
37#include <linux/inet.h>
38#include <linux/idr.h>
39#include <linux/file.h>
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050040#include <linux/parser.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050041#include <net/9p/9p.h>
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -050042#include <net/9p/client.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050043#include <net/9p/transport.h>
44
Al Viro6b186622009-08-06 02:02:43 +040045#include <linux/syscalls.h> /* killme */
46
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050047#define P9_PORT 564
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050048#define MAX_SOCK_BUF (64*1024)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060049#define MAXPOLLWADDR 2
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050050
Eric Van Hensbergenee443992008-03-05 07:08:09 -060051/**
52 * struct p9_fd_opts - per-transport options
53 * @rfd: file descriptor for reading (trans=fd)
54 * @wfd: file descriptor for writing (trans=fd)
55 * @port: port to connect to (trans=tcp)
56 *
57 */
58
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050059struct p9_fd_opts {
60 int rfd;
61 int wfd;
62 u16 port;
63};
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050064
Eric Van Hensbergenee443992008-03-05 07:08:09 -060065/**
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
70 *
71 */
72
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050073struct p9_trans_fd {
74 struct file *rd;
75 struct file *wr;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060076 struct p9_conn *conn;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050077};
78
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050079/*
80 * Option Parsing (code inspired by NFS code)
81 * - a little lazy - parse all fd-transport options
82 */
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050083
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050084enum {
85 /* Options that take integer arguments */
Latchesar Ionkov55762692007-11-06 08:02:53 -060086 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050087};
88
Steven Whitehousea447c092008-10-13 10:46:57 +010089static const match_table_t tokens = {
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050090 {Opt_port, "port=%u"},
91 {Opt_rfdno, "rfdno=%u"},
92 {Opt_wfdno, "wfdno=%u"},
Latchesar Ionkov55762692007-11-06 08:02:53 -060093 {Opt_err, NULL},
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050094};
95
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060096enum {
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 */
101};
102
Tejun Heo992b3f12008-10-13 18:45:25 -0500103struct p9_poll_wait {
104 struct p9_conn *conn;
105 wait_queue_t wait;
106 wait_queue_head_t *wait_addr;
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600107};
108
109/**
110 * struct p9_conn - fd mux connection state information
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600111 * @mux_list: list link for mux to manage multiple connections (?)
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500112 * @client: reference to client instance for this connection
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600113 * @err: error state
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600114 * @req_list: accounting for requests which have been sent
115 * @unsent_req_list: accounting for requests that haven't been sent
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500116 * @req: current request being processed (if any)
117 * @tmp_buf: temporary buffer to read in header
118 * @rsize: amount to read for current frame
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600119 * @rpos: read position in current frame
120 * @rbuf: current read buffer
121 * @wpos: write position for current frame
122 * @wsize: amount of data to write for current frame
123 * @wbuf: current write buffer
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600124 * @poll_pending_link: pending links to be polled per conn
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600125 * @poll_wait: array of wait_q's for various worker threads
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600126 * @pt: poll state
127 * @rq: current read work
128 * @wq: current write work
129 * @wsched: ????
130 *
131 */
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600132
133struct p9_conn {
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600134 struct list_head mux_list;
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500135 struct p9_client *client;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600136 int err;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600137 struct list_head req_list;
138 struct list_head unsent_req_list;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500139 struct p9_req_t *req;
140 char tmp_buf[7];
141 int rsize;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600142 int rpos;
143 char *rbuf;
144 int wpos;
145 int wsize;
146 char *wbuf;
Tejun Heo992b3f12008-10-13 18:45:25 -0500147 struct list_head poll_pending_link;
148 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600149 poll_table pt;
150 struct work_struct rq;
151 struct work_struct wq;
152 unsigned long wsched;
153};
154
Tejun Heo992b3f12008-10-13 18:45:25 -0500155static DEFINE_SPINLOCK(p9_poll_lock);
156static LIST_HEAD(p9_poll_pending_list);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600157static struct workqueue_struct *p9_mux_wq;
Tejun Heo992b3f12008-10-13 18:45:25 -0500158static struct task_struct *p9_poll_task;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600159
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600160static void p9_mux_poll_stop(struct p9_conn *m)
161{
Tejun Heo992b3f12008-10-13 18:45:25 -0500162 unsigned long flags;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600163 int i;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600164
Tejun Heo992b3f12008-10-13 18:45:25 -0500165 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
166 struct p9_poll_wait *pwait = &m->poll_wait[i];
167
168 if (pwait->wait_addr) {
169 remove_wait_queue(pwait->wait_addr, &pwait->wait);
170 pwait->wait_addr = NULL;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600171 }
172 }
Tejun Heo992b3f12008-10-13 18:45:25 -0500173
174 spin_lock_irqsave(&p9_poll_lock, flags);
175 list_del_init(&m->poll_pending_link);
176 spin_unlock_irqrestore(&p9_poll_lock, flags);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600177}
178
179/**
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500180 * p9_conn_cancel - cancel all pending requests with error
181 * @m: mux data
182 * @err: error code
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600183 *
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600184 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600185
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500186static void p9_conn_cancel(struct p9_conn *m, int err)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600187{
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500188 struct p9_req_t *req, *rtmp;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500189 unsigned long flags;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500190 LIST_HEAD(cancel_list);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600191
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500192 P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500193
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500194 spin_lock_irqsave(&m->client->lock, flags);
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500195
196 if (m->err) {
197 spin_unlock_irqrestore(&m->client->lock, flags);
198 return;
199 }
200
201 m->err = err;
202
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500203 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500204 req->status = REQ_STATUS_ERROR;
205 if (!req->t_err)
206 req->t_err = err;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500207 list_move(&req->req_list, &cancel_list);
Tejun Heo992b3f12008-10-13 18:45:25 -0500208 }
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500209 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500210 req->status = REQ_STATUS_ERROR;
211 if (!req->t_err)
212 req->t_err = err;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500213 list_move(&req->req_list, &cancel_list);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600214 }
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500215 spin_unlock_irqrestore(&m->client->lock, flags);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600216
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500217 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500218 P9_DPRINTK(P9_DEBUG_ERROR, "call back req %p\n", req);
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500219 list_del(&req->req_list);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500220 p9_client_cb(m->client, req);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600221 }
222}
223
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500224static unsigned int
225p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
226{
227 int ret, n;
228 struct p9_trans_fd *ts = NULL;
229
230 if (client && client->status == Connected)
231 ts = client->trans;
232
233 if (!ts)
234 return -EREMOTEIO;
235
236 if (!ts->rd->f_op || !ts->rd->f_op->poll)
237 return -EIO;
238
239 if (!ts->wr->f_op || !ts->wr->f_op->poll)
240 return -EIO;
241
242 ret = ts->rd->f_op->poll(ts->rd, pt);
243 if (ret < 0)
244 return ret;
245
246 if (ts->rd != ts->wr) {
247 n = ts->wr->f_op->poll(ts->wr, pt);
248 if (n < 0)
249 return n;
250 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
251 }
252
253 return ret;
254}
255
256/**
257 * p9_fd_read- read from a fd
258 * @client: client instance
259 * @v: buffer to receive data into
260 * @len: size of receive buffer
261 *
262 */
263
264static int p9_fd_read(struct p9_client *client, void *v, int len)
265{
266 int ret;
267 struct p9_trans_fd *ts = NULL;
268
269 if (client && client->status != Disconnected)
270 ts = client->trans;
271
272 if (!ts)
273 return -EREMOTEIO;
274
275 if (!(ts->rd->f_flags & O_NONBLOCK))
276 P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
277
278 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
279 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
280 client->status = Disconnected;
281 return ret;
282}
283
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600284/**
285 * p9_read_work - called when there is some data to be read from a transport
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600286 * @work: container of work to be done
287 *
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600288 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600289
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600290static void p9_read_work(struct work_struct *work)
291{
292 int n, err;
293 struct p9_conn *m;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600294
295 m = container_of(work, struct p9_conn, rq);
296
297 if (m->err < 0)
298 return;
299
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500300 P9_DPRINTK(P9_DEBUG_TRANS, "start mux %p pos %d\n", m, m->rpos);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600301
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500302 if (!m->rbuf) {
303 m->rbuf = m->tmp_buf;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600304 m->rpos = 0;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500305 m->rsize = 7; /* start by reading header */
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600306 }
307
308 clear_bit(Rpending, &m->wsched);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500309 P9_DPRINTK(P9_DEBUG_TRANS, "read mux %p pos %d size: %d = %d\n", m,
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500310 m->rpos, m->rsize, m->rsize-m->rpos);
Eric Van Hensbergenbead27f2008-10-13 18:45:24 -0500311 err = p9_fd_read(m->client, m->rbuf + m->rpos,
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500312 m->rsize - m->rpos);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500313 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600314 if (err == -EAGAIN) {
315 clear_bit(Rworksched, &m->wsched);
316 return;
317 }
318
319 if (err <= 0)
320 goto error;
321
322 m->rpos += err;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500323
324 if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */
325 u16 tag;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500326 P9_DPRINTK(P9_DEBUG_TRANS, "got new header\n");
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500327
328 n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */
Eric Van Hensbergenbead27f2008-10-13 18:45:24 -0500329 if (n >= m->client->msize) {
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600330 P9_DPRINTK(P9_DEBUG_ERROR,
331 "requested packet size too big: %d\n", n);
332 err = -EIO;
333 goto error;
334 }
335
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500336 tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500337 P9_DPRINTK(P9_DEBUG_TRANS,
338 "mux %p pkt: size: %d bytes tag: %d\n", m, n, tag);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600339
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500340 m->req = p9_tag_lookup(m->client, tag);
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500341 if (!m->req || (m->req->status != REQ_STATUS_SENT &&
342 m->req->status != REQ_STATUS_FLSH)) {
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500343 P9_DPRINTK(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
344 tag);
345 err = -EIO;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600346 goto error;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500347 }
348
349 if (m->req->rc == NULL) {
350 m->req->rc = kmalloc(sizeof(struct p9_fcall) +
351 m->client->msize, GFP_KERNEL);
352 if (!m->req->rc) {
353 m->req = NULL;
354 err = -ENOMEM;
355 goto error;
356 }
357 }
358 m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall);
359 memcpy(m->rbuf, m->tmp_buf, m->rsize);
360 m->rsize = n;
361 }
362
363 /* not an else because some packets (like clunk) have no payload */
364 if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500365 P9_DPRINTK(P9_DEBUG_TRANS, "got new packet\n");
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500366 spin_lock(&m->client->lock);
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500367 if (m->req->status != REQ_STATUS_ERROR)
368 m->req->status = REQ_STATUS_RCVD;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500369 list_del(&m->req->req_list);
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500370 spin_unlock(&m->client->lock);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500371 p9_client_cb(m->client, m->req);
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500372 m->rbuf = NULL;
373 m->rpos = 0;
374 m->rsize = 0;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500375 m->req = NULL;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600376 }
377
378 if (!list_empty(&m->req_list)) {
379 if (test_and_clear_bit(Rpending, &m->wsched))
380 n = POLLIN;
381 else
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500382 n = p9_fd_poll(m->client, NULL);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600383
384 if (n & POLLIN) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500385 P9_DPRINTK(P9_DEBUG_TRANS, "sched read work %p\n", m);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600386 queue_work(p9_mux_wq, &m->rq);
387 } else
388 clear_bit(Rworksched, &m->wsched);
389 } else
390 clear_bit(Rworksched, &m->wsched);
391
392 return;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600393error:
394 p9_conn_cancel(m, err);
395 clear_bit(Rworksched, &m->wsched);
396}
397
398/**
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500399 * p9_fd_write - write to a socket
400 * @client: client instance
401 * @v: buffer to send data from
402 * @len: size of send buffer
403 *
404 */
405
406static int p9_fd_write(struct p9_client *client, void *v, int len)
407{
408 int ret;
409 mm_segment_t oldfs;
410 struct p9_trans_fd *ts = NULL;
411
412 if (client && client->status != Disconnected)
413 ts = client->trans;
414
415 if (!ts)
416 return -EREMOTEIO;
417
418 if (!(ts->wr->f_flags & O_NONBLOCK))
419 P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
420
421 oldfs = get_fs();
422 set_fs(get_ds());
423 /* The cast to a user pointer is valid due to the set_fs() */
Hannes Edere3db6cb2009-02-25 10:31:37 +0000424 ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500425 set_fs(oldfs);
426
427 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
428 client->status = Disconnected;
429 return ret;
430}
431
432/**
433 * p9_write_work - called when a transport can send some data
434 * @work: container for work to be done
435 *
436 */
437
438static void p9_write_work(struct work_struct *work)
439{
440 int n, err;
441 struct p9_conn *m;
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500442 struct p9_req_t *req;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500443
444 m = container_of(work, struct p9_conn, wq);
445
446 if (m->err < 0) {
447 clear_bit(Wworksched, &m->wsched);
448 return;
449 }
450
451 if (!m->wsize) {
452 if (list_empty(&m->unsent_req_list)) {
453 clear_bit(Wworksched, &m->wsched);
454 return;
455 }
456
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500457 spin_lock(&m->client->lock);
458 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500459 req_list);
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500460 req->status = REQ_STATUS_SENT;
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500461 P9_DPRINTK(P9_DEBUG_TRANS, "move req %p\n", req);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500462 list_move_tail(&req->req_list, &m->req_list);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500463
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500464 m->wbuf = req->tc->sdata;
465 m->wsize = req->tc->size;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500466 m->wpos = 0;
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500467 spin_unlock(&m->client->lock);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500468 }
469
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500470 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", m, m->wpos,
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500471 m->wsize);
472 clear_bit(Wpending, &m->wsched);
473 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500474 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500475 if (err == -EAGAIN) {
476 clear_bit(Wworksched, &m->wsched);
477 return;
478 }
479
480 if (err < 0)
481 goto error;
482 else if (err == 0) {
483 err = -EREMOTEIO;
484 goto error;
485 }
486
487 m->wpos += err;
488 if (m->wpos == m->wsize)
489 m->wpos = m->wsize = 0;
490
491 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
492 if (test_and_clear_bit(Wpending, &m->wsched))
493 n = POLLOUT;
494 else
495 n = p9_fd_poll(m->client, NULL);
496
497 if (n & POLLOUT) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500498 P9_DPRINTK(P9_DEBUG_TRANS, "sched write work %p\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500499 queue_work(p9_mux_wq, &m->wq);
500 } else
501 clear_bit(Wworksched, &m->wsched);
502 } else
503 clear_bit(Wworksched, &m->wsched);
504
505 return;
506
507error:
508 p9_conn_cancel(m, err);
509 clear_bit(Wworksched, &m->wsched);
510}
511
512static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key)
513{
514 struct p9_poll_wait *pwait =
515 container_of(wait, struct p9_poll_wait, wait);
516 struct p9_conn *m = pwait->conn;
517 unsigned long flags;
518 DECLARE_WAITQUEUE(dummy_wait, p9_poll_task);
519
520 spin_lock_irqsave(&p9_poll_lock, flags);
521 if (list_empty(&m->poll_pending_link))
522 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
523 spin_unlock_irqrestore(&p9_poll_lock, flags);
524
525 /* perform the default wake up operation */
526 return default_wake_function(&dummy_wait, mode, sync, key);
527}
528
529/**
530 * p9_pollwait - add poll task to the wait queue
531 * @filp: file pointer being polled
532 * @wait_address: wait_q to block on
533 * @p: poll state
534 *
535 * called by files poll operation to add v9fs-poll task to files wait queue
536 */
537
538static void
539p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
540{
541 struct p9_conn *m = container_of(p, struct p9_conn, pt);
542 struct p9_poll_wait *pwait = NULL;
543 int i;
544
545 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
546 if (m->poll_wait[i].wait_addr == NULL) {
547 pwait = &m->poll_wait[i];
548 break;
549 }
550 }
551
552 if (!pwait) {
553 P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
554 return;
555 }
556
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500557 pwait->conn = m;
558 pwait->wait_addr = wait_address;
559 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
560 add_wait_queue(wait_address, &pwait->wait);
561}
562
563/**
564 * p9_conn_create - allocate and initialize the per-session mux data
565 * @client: client instance
566 *
567 * Note: Creates the polling task if this is the first session.
568 */
569
570static struct p9_conn *p9_conn_create(struct p9_client *client)
571{
Tejun Heo95820a32008-10-13 18:45:20 -0500572 int n;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500573 struct p9_conn *m;
574
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500575 P9_DPRINTK(P9_DEBUG_TRANS, "client %p msize %d\n", client,
576 client->msize);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500577 m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
578 if (!m)
579 return ERR_PTR(-ENOMEM);
580
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500581 INIT_LIST_HEAD(&m->mux_list);
582 m->client = client;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500583
584 INIT_LIST_HEAD(&m->req_list);
585 INIT_LIST_HEAD(&m->unsent_req_list);
586 INIT_WORK(&m->rq, p9_read_work);
587 INIT_WORK(&m->wq, p9_write_work);
588 INIT_LIST_HEAD(&m->poll_pending_link);
589 init_poll_funcptr(&m->pt, p9_pollwait);
590
591 n = p9_fd_poll(client, &m->pt);
592 if (n & POLLIN) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500593 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can read\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500594 set_bit(Rpending, &m->wsched);
595 }
596
597 if (n & POLLOUT) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500598 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can write\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500599 set_bit(Wpending, &m->wsched);
600 }
601
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500602 return m;
603}
604
605/**
606 * p9_poll_mux - polls a mux and schedules read or write works if necessary
607 * @m: connection to poll
608 *
609 */
610
611static void p9_poll_mux(struct p9_conn *m)
612{
613 int n;
614
615 if (m->err < 0)
616 return;
617
618 n = p9_fd_poll(m->client, NULL);
619 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500620 P9_DPRINTK(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500621 if (n >= 0)
622 n = -ECONNRESET;
623 p9_conn_cancel(m, n);
624 }
625
626 if (n & POLLIN) {
627 set_bit(Rpending, &m->wsched);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500628 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can read\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500629 if (!test_and_set_bit(Rworksched, &m->wsched)) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500630 P9_DPRINTK(P9_DEBUG_TRANS, "sched read work %p\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500631 queue_work(p9_mux_wq, &m->rq);
632 }
633 }
634
635 if (n & POLLOUT) {
636 set_bit(Wpending, &m->wsched);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500637 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can write\n", m);
Joe Perchesf64f9e72009-11-29 16:55:45 -0800638 if ((m->wsize || !list_empty(&m->unsent_req_list)) &&
639 !test_and_set_bit(Wworksched, &m->wsched)) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500640 P9_DPRINTK(P9_DEBUG_TRANS, "sched write work %p\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500641 queue_work(p9_mux_wq, &m->wq);
642 }
643 }
644}
645
646/**
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500647 * p9_fd_request - send 9P request
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600648 * The function can sleep until the request is scheduled for sending.
649 * The function can be interrupted. Return from the function is not
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500650 * a guarantee that the request is sent successfully.
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600651 *
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500652 * @client: client instance
653 * @req: request to be sent
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600654 *
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600655 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600656
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500657static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600658{
659 int n;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500660 struct p9_trans_fd *ts = client->trans;
661 struct p9_conn *m = ts->conn;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600662
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500663 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", m,
664 current, req->tc, req->tc->id);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600665 if (m->err < 0)
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500666 return m->err;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600667
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500668 spin_lock(&client->lock);
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500669 req->status = REQ_STATUS_UNSENT;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600670 list_add_tail(&req->req_list, &m->unsent_req_list);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500671 spin_unlock(&client->lock);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600672
673 if (test_and_clear_bit(Wpending, &m->wsched))
674 n = POLLOUT;
675 else
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500676 n = p9_fd_poll(m->client, NULL);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600677
678 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
679 queue_work(p9_mux_wq, &m->wq);
680
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500681 return 0;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600682}
683
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500684static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600685{
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500686 int ret = 1;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600687
Eric Van Hensbergen0b15a3a2008-10-22 18:47:40 -0500688 P9_DPRINTK(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600689
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500690 spin_lock(&client->lock);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500691
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500692 if (req->status == REQ_STATUS_UNSENT) {
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500693 list_del(&req->req_list);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500694 req->status = REQ_STATUS_FLSHD;
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500695 ret = 0;
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500696 } else if (req->status == REQ_STATUS_SENT)
697 req->status = REQ_STATUS_FLSH;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600698
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500699 spin_unlock(&client->lock);
700
701 return ret;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600702}
703
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600704/**
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600705 * parse_opts - parse mount options into p9_fd_opts structure
706 * @params: options string passed from mount
707 * @opts: fd transport-specific structure to parse options into
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500708 *
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600709 * Returns 0 upon success, -ERRNO upon failure
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500710 */
711
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600712static int parse_opts(char *params, struct p9_fd_opts *opts)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500713{
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500714 char *p;
715 substring_t args[MAX_OPT_ARGS];
716 int option;
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600717 char *options;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500718 int ret;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500719
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500720 opts->port = P9_PORT;
721 opts->rfd = ~0;
722 opts->wfd = ~0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500723
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600724 if (!params)
725 return 0;
726
727 options = kstrdup(params, GFP_KERNEL);
728 if (!options) {
729 P9_DPRINTK(P9_DEBUG_ERROR,
730 "failed to allocate copy of option string\n");
731 return -ENOMEM;
732 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500733
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500734 while ((p = strsep(&options, ",")) != NULL) {
735 int token;
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600736 int r;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500737 if (!*p)
738 continue;
739 token = match_token(p, tokens, args);
Abhishek Kulkarni15da4b12009-07-01 08:50:54 +0000740 if (token != Opt_err) {
741 r = match_int(&args[0], &option);
742 if (r < 0) {
743 P9_DPRINTK(P9_DEBUG_ERROR,
744 "integer field, but no integer?\n");
745 ret = r;
746 continue;
747 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500748 }
749 switch (token) {
750 case Opt_port:
751 opts->port = option;
752 break;
753 case Opt_rfdno:
754 opts->rfd = option;
755 break;
756 case Opt_wfdno:
757 opts->wfd = option;
758 break;
759 default:
760 continue;
761 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500762 }
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600763 kfree(options);
764 return 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500765}
766
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500767static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500768{
769 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
770 GFP_KERNEL);
771 if (!ts)
772 return -ENOMEM;
773
774 ts->rd = fget(rfd);
775 ts->wr = fget(wfd);
776 if (!ts->rd || !ts->wr) {
777 if (ts->rd)
778 fput(ts->rd);
779 if (ts->wr)
780 fput(ts->wr);
781 kfree(ts);
782 return -EIO;
783 }
784
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500785 client->trans = ts;
786 client->status = Connected;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500787
788 return 0;
789}
790
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500791static int p9_socket_open(struct p9_client *client, struct socket *csocket)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500792{
Al Viro6b186622009-08-06 02:02:43 +0400793 struct p9_trans_fd *p;
794 int ret, fd;
795
796 p = kmalloc(sizeof(struct p9_trans_fd), GFP_KERNEL);
797 if (!p)
798 return -ENOMEM;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500799
800 csocket->sk->sk_allocation = GFP_NOIO;
Ulrich Dreppera677a032008-07-23 21:29:17 -0700801 fd = sock_map_fd(csocket, 0);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500802 if (fd < 0) {
803 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
Al Viro6b186622009-08-06 02:02:43 +0400804 sock_release(csocket);
805 kfree(p);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500806 return fd;
807 }
808
Al Viro6b186622009-08-06 02:02:43 +0400809 get_file(csocket->file);
810 get_file(csocket->file);
811 p->wr = p->rd = csocket->file;
812 client->trans = p;
813 client->status = Connected;
814
815 sys_close(fd); /* still racy */
816
817 p->rd->f_flags |= O_NONBLOCK;
818
819 p->conn = p9_conn_create(client);
820 if (IS_ERR(p->conn)) {
821 ret = PTR_ERR(p->conn);
822 p->conn = NULL;
823 kfree(p);
824 sockfd_put(csocket);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500825 sockfd_put(csocket);
826 return ret;
827 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500828 return 0;
829}
830
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500831/**
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500832 * p9_mux_destroy - cancels all pending requests and frees mux resources
833 * @m: mux to destroy
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500834 *
835 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600836
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500837static void p9_conn_destroy(struct p9_conn *m)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500838{
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500839 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", m,
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500840 m->mux_list.prev, m->mux_list.next);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500841
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500842 p9_mux_poll_stop(m);
843 cancel_work_sync(&m->rq);
844 cancel_work_sync(&m->wq);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500845
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500846 p9_conn_cancel(m, -ECONNRESET);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500847
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500848 m->client = NULL;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500849 kfree(m);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500850}
851
852/**
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500853 * p9_fd_close - shutdown file descriptor transport
854 * @client: client instance
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500855 *
856 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600857
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500858static void p9_fd_close(struct p9_client *client)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500859{
860 struct p9_trans_fd *ts;
861
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500862 if (!client)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500863 return;
864
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500865 ts = client->trans;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500866 if (!ts)
867 return;
868
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500869 client->status = Disconnected;
870
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600871 p9_conn_destroy(ts->conn);
872
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500873 if (ts->rd)
874 fput(ts->rd);
875 if (ts->wr)
876 fput(ts->wr);
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500877
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500878 kfree(ts);
879}
880
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500881/*
882 * stolen from NFS - maybe should be made a generic function?
883 */
884static inline int valid_ipaddr4(const char *buf)
885{
886 int rc, count, in[4];
887
888 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
889 if (rc != 4)
890 return -EINVAL;
891 for (count = 0; count < 4; count++) {
892 if (in[count] > 255)
893 return -EINVAL;
894 }
895 return 0;
896}
897
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500898static int
899p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500900{
901 int err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500902 struct socket *csocket;
903 struct sockaddr_in sin_server;
904 struct p9_fd_opts opts;
905
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600906 err = parse_opts(args, &opts);
907 if (err < 0)
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500908 return err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500909
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500910 if (valid_ipaddr4(addr) < 0)
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500911 return -EINVAL;
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500912
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500913 csocket = NULL;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500914
915 sin_server.sin_family = AF_INET;
916 sin_server.sin_addr.s_addr = in_aton(addr);
917 sin_server.sin_port = htons(opts.port);
Al Viro6b186622009-08-06 02:02:43 +0400918 err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500919
Al Viro6b186622009-08-06 02:02:43 +0400920 if (err) {
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500921 P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n");
Al Viro6b186622009-08-06 02:02:43 +0400922 return err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500923 }
924
925 err = csocket->ops->connect(csocket,
926 (struct sockaddr *)&sin_server,
927 sizeof(struct sockaddr_in), 0);
928 if (err < 0) {
929 P9_EPRINTK(KERN_ERR,
930 "p9_trans_tcp: problem connecting socket to %s\n",
931 addr);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500932 sock_release(csocket);
Al Viro6b186622009-08-06 02:02:43 +0400933 return err;
934 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500935
Al Viro6b186622009-08-06 02:02:43 +0400936 return p9_socket_open(client, csocket);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500937}
938
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500939static int
940p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500941{
942 int err;
943 struct socket *csocket;
944 struct sockaddr_un sun_server;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500945
946 csocket = NULL;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500947
948 if (strlen(addr) > UNIX_PATH_MAX) {
949 P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
950 addr);
Al Viro6b186622009-08-06 02:02:43 +0400951 return -ENAMETOOLONG;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500952 }
953
954 sun_server.sun_family = PF_UNIX;
955 strcpy(sun_server.sun_path, addr);
Al Viro6b186622009-08-06 02:02:43 +0400956 err = sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
957 if (err < 0) {
958 P9_EPRINTK(KERN_ERR, "p9_trans_unix: problem creating socket\n");
959 return err;
960 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500961 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
962 sizeof(struct sockaddr_un) - 1, 0);
963 if (err < 0) {
964 P9_EPRINTK(KERN_ERR,
965 "p9_trans_unix: problem connecting socket: %s: %d\n",
966 addr, err);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500967 sock_release(csocket);
Al Viro6b186622009-08-06 02:02:43 +0400968 return err;
969 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500970
Al Viro6b186622009-08-06 02:02:43 +0400971 return p9_socket_open(client, csocket);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500972}
973
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500974static int
975p9_fd_create(struct p9_client *client, const char *addr, char *args)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500976{
977 int err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500978 struct p9_fd_opts opts;
Al Viro6b186622009-08-06 02:02:43 +0400979 struct p9_trans_fd *p;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500980
981 parse_opts(args, &opts);
982
983 if (opts.rfd == ~0 || opts.wfd == ~0) {
984 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500985 return -ENOPROTOOPT;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500986 }
987
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500988 err = p9_fd_open(client, opts.rfd, opts.wfd);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500989 if (err < 0)
Al Viro6b186622009-08-06 02:02:43 +0400990 return err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500991
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500992 p = (struct p9_trans_fd *) client->trans;
993 p->conn = p9_conn_create(client);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600994 if (IS_ERR(p->conn)) {
995 err = PTR_ERR(p->conn);
996 p->conn = NULL;
Al Viro6b186622009-08-06 02:02:43 +0400997 fput(p->rd);
998 fput(p->wr);
999 return err;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06001000 }
1001
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001002 return 0;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001003}
1004
1005static struct p9_trans_module p9_tcp_trans = {
1006 .name = "tcp",
1007 .maxsize = MAX_SOCK_BUF,
1008 .def = 1,
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001009 .create = p9_fd_create_tcp,
1010 .close = p9_fd_close,
Eric Van Hensbergen91b85342008-10-13 18:45:21 -05001011 .request = p9_fd_request,
1012 .cancel = p9_fd_cancel,
Tejun Heo72029fe2008-09-24 16:22:23 -05001013 .owner = THIS_MODULE,
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001014};
1015
1016static struct p9_trans_module p9_unix_trans = {
1017 .name = "unix",
1018 .maxsize = MAX_SOCK_BUF,
1019 .def = 0,
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001020 .create = p9_fd_create_unix,
1021 .close = p9_fd_close,
Eric Van Hensbergen91b85342008-10-13 18:45:21 -05001022 .request = p9_fd_request,
1023 .cancel = p9_fd_cancel,
Tejun Heo72029fe2008-09-24 16:22:23 -05001024 .owner = THIS_MODULE,
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001025};
1026
1027static struct p9_trans_module p9_fd_trans = {
1028 .name = "fd",
1029 .maxsize = MAX_SOCK_BUF,
1030 .def = 0,
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001031 .create = p9_fd_create,
1032 .close = p9_fd_close,
Eric Van Hensbergen91b85342008-10-13 18:45:21 -05001033 .request = p9_fd_request,
1034 .cancel = p9_fd_cancel,
Tejun Heo72029fe2008-09-24 16:22:23 -05001035 .owner = THIS_MODULE,
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001036};
1037
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001038/**
1039 * p9_poll_proc - poll worker thread
1040 * @a: thread state and arguments
1041 *
1042 * polls all v9fs transports for new events and queues the appropriate
1043 * work to the work queue
1044 *
1045 */
1046
1047static int p9_poll_proc(void *a)
1048{
1049 unsigned long flags;
1050
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001051 P9_DPRINTK(P9_DEBUG_TRANS, "start %p\n", current);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001052 repeat:
1053 spin_lock_irqsave(&p9_poll_lock, flags);
1054 while (!list_empty(&p9_poll_pending_list)) {
1055 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1056 struct p9_conn,
1057 poll_pending_link);
1058 list_del_init(&conn->poll_pending_link);
1059 spin_unlock_irqrestore(&p9_poll_lock, flags);
1060
1061 p9_poll_mux(conn);
1062
1063 spin_lock_irqsave(&p9_poll_lock, flags);
1064 }
1065 spin_unlock_irqrestore(&p9_poll_lock, flags);
1066
1067 set_current_state(TASK_INTERRUPTIBLE);
1068 if (list_empty(&p9_poll_pending_list)) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001069 P9_DPRINTK(P9_DEBUG_TRANS, "sleeping...\n");
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001070 schedule();
1071 }
1072 __set_current_state(TASK_RUNNING);
1073
1074 if (!kthread_should_stop())
1075 goto repeat;
1076
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001077 P9_DPRINTK(P9_DEBUG_TRANS, "finish\n");
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001078 return 0;
1079}
1080
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -05001081int p9_trans_fd_init(void)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001082{
Tejun Heo206ca502008-09-24 16:22:23 -05001083 p9_mux_wq = create_workqueue("v9fs");
1084 if (!p9_mux_wq) {
1085 printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n");
1086 return -ENOMEM;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06001087 }
1088
Tejun Heo992b3f12008-10-13 18:45:25 -05001089 p9_poll_task = kthread_run(p9_poll_proc, NULL, "v9fs-poll");
1090 if (IS_ERR(p9_poll_task)) {
1091 destroy_workqueue(p9_mux_wq);
1092 printk(KERN_WARNING "v9fs: mux: creating poll task failed\n");
1093 return PTR_ERR(p9_poll_task);
1094 }
1095
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001096 v9fs_register_trans(&p9_tcp_trans);
1097 v9fs_register_trans(&p9_unix_trans);
1098 v9fs_register_trans(&p9_fd_trans);
1099
Andrew Morton3387b802008-03-28 14:15:57 -07001100 return 0;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001101}
Tejun Heo72029fe2008-09-24 16:22:23 -05001102
1103void p9_trans_fd_exit(void)
1104{
Tejun Heo992b3f12008-10-13 18:45:25 -05001105 kthread_stop(p9_poll_task);
Tejun Heo72029fe2008-09-24 16:22:23 -05001106 v9fs_unregister_trans(&p9_tcp_trans);
1107 v9fs_unregister_trans(&p9_unix_trans);
1108 v9fs_unregister_trans(&p9_fd_trans);
Tejun Heo206ca502008-09-24 16:22:23 -05001109
1110 destroy_workqueue(p9_mux_wq);
Tejun Heo72029fe2008-09-24 16:22:23 -05001111}