blob: 078eb162d9bfc4e7d6c05cd5b59c6b8920fec31e [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090041#include <linux/slab.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050042#include <net/9p/9p.h>
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -050043#include <net/9p/client.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050044#include <net/9p/transport.h>
45
Al Viro6b186622009-08-06 02:02:43 +040046#include <linux/syscalls.h> /* killme */
47
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050048#define P9_PORT 564
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050049#define MAX_SOCK_BUF (64*1024)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060050#define MAXPOLLWADDR 2
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050051
Eric Van Hensbergenee443992008-03-05 07:08:09 -060052/**
53 * struct p9_fd_opts - per-transport options
54 * @rfd: file descriptor for reading (trans=fd)
55 * @wfd: file descriptor for writing (trans=fd)
56 * @port: port to connect to (trans=tcp)
57 *
58 */
59
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050060struct p9_fd_opts {
61 int rfd;
62 int wfd;
63 u16 port;
64};
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050065
Eric Van Hensbergenee443992008-03-05 07:08:09 -060066/**
67 * struct p9_trans_fd - transport state
68 * @rd: reference to file to read from
69 * @wr: reference of file to write to
70 * @conn: connection state reference
71 *
72 */
73
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050074struct p9_trans_fd {
75 struct file *rd;
76 struct file *wr;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060077 struct p9_conn *conn;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050078};
79
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050080/*
81 * Option Parsing (code inspired by NFS code)
82 * - a little lazy - parse all fd-transport options
83 */
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050084
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050085enum {
86 /* Options that take integer arguments */
Latchesar Ionkov55762692007-11-06 08:02:53 -060087 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050088};
89
Steven Whitehousea447c092008-10-13 10:46:57 +010090static const match_table_t tokens = {
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050091 {Opt_port, "port=%u"},
92 {Opt_rfdno, "rfdno=%u"},
93 {Opt_wfdno, "wfdno=%u"},
Latchesar Ionkov55762692007-11-06 08:02:53 -060094 {Opt_err, NULL},
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050095};
96
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060097enum {
98 Rworksched = 1, /* read work scheduled or running */
99 Rpending = 2, /* can read */
100 Wworksched = 4, /* write work scheduled or running */
101 Wpending = 8, /* can write */
102};
103
Tejun Heo992b3f12008-10-13 18:45:25 -0500104struct p9_poll_wait {
105 struct p9_conn *conn;
106 wait_queue_t wait;
107 wait_queue_head_t *wait_addr;
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600108};
109
110/**
111 * struct p9_conn - fd mux connection state information
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600112 * @mux_list: list link for mux to manage multiple connections (?)
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500113 * @client: reference to client instance for this connection
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600114 * @err: error state
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600115 * @req_list: accounting for requests which have been sent
116 * @unsent_req_list: accounting for requests that haven't been sent
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500117 * @req: current request being processed (if any)
118 * @tmp_buf: temporary buffer to read in header
119 * @rsize: amount to read for current frame
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600120 * @rpos: read position in current frame
121 * @rbuf: current read buffer
122 * @wpos: write position for current frame
123 * @wsize: amount of data to write for current frame
124 * @wbuf: current write buffer
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600125 * @poll_pending_link: pending links to be polled per conn
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600126 * @poll_wait: array of wait_q's for various worker threads
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600127 * @pt: poll state
128 * @rq: current read work
129 * @wq: current write work
130 * @wsched: ????
131 *
132 */
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600133
134struct p9_conn {
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600135 struct list_head mux_list;
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500136 struct p9_client *client;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600137 int err;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600138 struct list_head req_list;
139 struct list_head unsent_req_list;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500140 struct p9_req_t *req;
141 char tmp_buf[7];
142 int rsize;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600143 int rpos;
144 char *rbuf;
145 int wpos;
146 int wsize;
147 char *wbuf;
Tejun Heo992b3f12008-10-13 18:45:25 -0500148 struct list_head poll_pending_link;
149 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600150 poll_table pt;
151 struct work_struct rq;
152 struct work_struct wq;
153 unsigned long wsched;
154};
155
Tejun Heo992b3f12008-10-13 18:45:25 -0500156static DEFINE_SPINLOCK(p9_poll_lock);
157static LIST_HEAD(p9_poll_pending_list);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600158static struct workqueue_struct *p9_mux_wq;
Tejun Heo992b3f12008-10-13 18:45:25 -0500159static struct task_struct *p9_poll_task;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600160
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600161static void p9_mux_poll_stop(struct p9_conn *m)
162{
Tejun Heo992b3f12008-10-13 18:45:25 -0500163 unsigned long flags;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600164 int i;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600165
Tejun Heo992b3f12008-10-13 18:45:25 -0500166 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
167 struct p9_poll_wait *pwait = &m->poll_wait[i];
168
169 if (pwait->wait_addr) {
170 remove_wait_queue(pwait->wait_addr, &pwait->wait);
171 pwait->wait_addr = NULL;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600172 }
173 }
Tejun Heo992b3f12008-10-13 18:45:25 -0500174
175 spin_lock_irqsave(&p9_poll_lock, flags);
176 list_del_init(&m->poll_pending_link);
177 spin_unlock_irqrestore(&p9_poll_lock, flags);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600178}
179
180/**
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500181 * p9_conn_cancel - cancel all pending requests with error
182 * @m: mux data
183 * @err: error code
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600184 *
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600185 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600186
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500187static void p9_conn_cancel(struct p9_conn *m, int err)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600188{
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500189 struct p9_req_t *req, *rtmp;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500190 unsigned long flags;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500191 LIST_HEAD(cancel_list);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600192
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500193 P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500194
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500195 spin_lock_irqsave(&m->client->lock, flags);
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500196
197 if (m->err) {
198 spin_unlock_irqrestore(&m->client->lock, flags);
199 return;
200 }
201
202 m->err = err;
203
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500204 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500205 req->status = REQ_STATUS_ERROR;
206 if (!req->t_err)
207 req->t_err = err;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500208 list_move(&req->req_list, &cancel_list);
Tejun Heo992b3f12008-10-13 18:45:25 -0500209 }
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500210 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500211 req->status = REQ_STATUS_ERROR;
212 if (!req->t_err)
213 req->t_err = err;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500214 list_move(&req->req_list, &cancel_list);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600215 }
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500216 spin_unlock_irqrestore(&m->client->lock, flags);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600217
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500218 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500219 P9_DPRINTK(P9_DEBUG_ERROR, "call back req %p\n", req);
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500220 list_del(&req->req_list);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500221 p9_client_cb(m->client, req);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600222 }
223}
224
Julia Lawall29af9302010-09-05 09:00:21 +0000225static int
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500226p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
227{
228 int ret, n;
229 struct p9_trans_fd *ts = NULL;
230
231 if (client && client->status == Connected)
232 ts = client->trans;
233
234 if (!ts)
235 return -EREMOTEIO;
236
237 if (!ts->rd->f_op || !ts->rd->f_op->poll)
238 return -EIO;
239
240 if (!ts->wr->f_op || !ts->wr->f_op->poll)
241 return -EIO;
242
243 ret = ts->rd->f_op->poll(ts->rd, pt);
244 if (ret < 0)
245 return ret;
246
247 if (ts->rd != ts->wr) {
248 n = ts->wr->f_op->poll(ts->wr, pt);
249 if (n < 0)
250 return n;
251 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
252 }
253
254 return ret;
255}
256
257/**
258 * p9_fd_read- read from a fd
259 * @client: client instance
260 * @v: buffer to receive data into
261 * @len: size of receive buffer
262 *
263 */
264
265static int p9_fd_read(struct p9_client *client, void *v, int len)
266{
267 int ret;
268 struct p9_trans_fd *ts = NULL;
269
270 if (client && client->status != Disconnected)
271 ts = client->trans;
272
273 if (!ts)
274 return -EREMOTEIO;
275
276 if (!(ts->rd->f_flags & O_NONBLOCK))
277 P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
278
279 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
280 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
281 client->status = Disconnected;
282 return ret;
283}
284
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600285/**
286 * p9_read_work - called when there is some data to be read from a transport
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600287 * @work: container of work to be done
288 *
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600289 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600290
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600291static void p9_read_work(struct work_struct *work)
292{
293 int n, err;
294 struct p9_conn *m;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600295
296 m = container_of(work, struct p9_conn, rq);
297
298 if (m->err < 0)
299 return;
300
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500301 P9_DPRINTK(P9_DEBUG_TRANS, "start mux %p pos %d\n", m, m->rpos);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600302
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500303 if (!m->rbuf) {
304 m->rbuf = m->tmp_buf;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600305 m->rpos = 0;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500306 m->rsize = 7; /* start by reading header */
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600307 }
308
309 clear_bit(Rpending, &m->wsched);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500310 P9_DPRINTK(P9_DEBUG_TRANS, "read mux %p pos %d size: %d = %d\n", m,
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500311 m->rpos, m->rsize, m->rsize-m->rpos);
Eric Van Hensbergenbead27f2008-10-13 18:45:24 -0500312 err = p9_fd_read(m->client, m->rbuf + m->rpos,
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500313 m->rsize - m->rpos);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500314 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600315 if (err == -EAGAIN) {
316 clear_bit(Rworksched, &m->wsched);
317 return;
318 }
319
320 if (err <= 0)
321 goto error;
322
323 m->rpos += err;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500324
325 if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */
326 u16 tag;
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500327 P9_DPRINTK(P9_DEBUG_TRANS, "got new header\n");
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500328
329 n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */
Eric Van Hensbergenbead27f2008-10-13 18:45:24 -0500330 if (n >= m->client->msize) {
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600331 P9_DPRINTK(P9_DEBUG_ERROR,
332 "requested packet size too big: %d\n", n);
333 err = -EIO;
334 goto error;
335 }
336
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500337 tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500338 P9_DPRINTK(P9_DEBUG_TRANS,
339 "mux %p pkt: size: %d bytes tag: %d\n", m, n, tag);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600340
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500341 m->req = p9_tag_lookup(m->client, tag);
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500342 if (!m->req || (m->req->status != REQ_STATUS_SENT &&
343 m->req->status != REQ_STATUS_FLSH)) {
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500344 P9_DPRINTK(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
345 tag);
346 err = -EIO;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600347 goto error;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500348 }
349
350 if (m->req->rc == NULL) {
351 m->req->rc = kmalloc(sizeof(struct p9_fcall) +
352 m->client->msize, GFP_KERNEL);
353 if (!m->req->rc) {
354 m->req = NULL;
355 err = -ENOMEM;
356 goto error;
357 }
358 }
359 m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall);
360 memcpy(m->rbuf, m->tmp_buf, m->rsize);
361 m->rsize = n;
362 }
363
364 /* not an else because some packets (like clunk) have no payload */
365 if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500366 P9_DPRINTK(P9_DEBUG_TRANS, "got new packet\n");
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500367 spin_lock(&m->client->lock);
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500368 if (m->req->status != REQ_STATUS_ERROR)
369 m->req->status = REQ_STATUS_RCVD;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500370 list_del(&m->req->req_list);
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500371 spin_unlock(&m->client->lock);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500372 p9_client_cb(m->client, m->req);
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500373 m->rbuf = NULL;
374 m->rpos = 0;
375 m->rsize = 0;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500376 m->req = NULL;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600377 }
378
379 if (!list_empty(&m->req_list)) {
380 if (test_and_clear_bit(Rpending, &m->wsched))
381 n = POLLIN;
382 else
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500383 n = p9_fd_poll(m->client, NULL);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600384
385 if (n & POLLIN) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500386 P9_DPRINTK(P9_DEBUG_TRANS, "sched read work %p\n", m);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600387 queue_work(p9_mux_wq, &m->rq);
388 } else
389 clear_bit(Rworksched, &m->wsched);
390 } else
391 clear_bit(Rworksched, &m->wsched);
392
393 return;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600394error:
395 p9_conn_cancel(m, err);
396 clear_bit(Rworksched, &m->wsched);
397}
398
399/**
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500400 * p9_fd_write - write to a socket
401 * @client: client instance
402 * @v: buffer to send data from
403 * @len: size of send buffer
404 *
405 */
406
407static int p9_fd_write(struct p9_client *client, void *v, int len)
408{
409 int ret;
410 mm_segment_t oldfs;
411 struct p9_trans_fd *ts = NULL;
412
413 if (client && client->status != Disconnected)
414 ts = client->trans;
415
416 if (!ts)
417 return -EREMOTEIO;
418
419 if (!(ts->wr->f_flags & O_NONBLOCK))
420 P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
421
422 oldfs = get_fs();
423 set_fs(get_ds());
424 /* The cast to a user pointer is valid due to the set_fs() */
Hannes Edere3db6cb2009-02-25 10:31:37 +0000425 ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500426 set_fs(oldfs);
427
428 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
429 client->status = Disconnected;
430 return ret;
431}
432
433/**
434 * p9_write_work - called when a transport can send some data
435 * @work: container for work to be done
436 *
437 */
438
439static void p9_write_work(struct work_struct *work)
440{
441 int n, err;
442 struct p9_conn *m;
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500443 struct p9_req_t *req;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500444
445 m = container_of(work, struct p9_conn, wq);
446
447 if (m->err < 0) {
448 clear_bit(Wworksched, &m->wsched);
449 return;
450 }
451
452 if (!m->wsize) {
453 if (list_empty(&m->unsent_req_list)) {
454 clear_bit(Wworksched, &m->wsched);
455 return;
456 }
457
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500458 spin_lock(&m->client->lock);
459 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500460 req_list);
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500461 req->status = REQ_STATUS_SENT;
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500462 P9_DPRINTK(P9_DEBUG_TRANS, "move req %p\n", req);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500463 list_move_tail(&req->req_list, &m->req_list);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500464
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500465 m->wbuf = req->tc->sdata;
466 m->wsize = req->tc->size;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500467 m->wpos = 0;
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500468 spin_unlock(&m->client->lock);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500469 }
470
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500471 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", m, m->wpos,
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500472 m->wsize);
473 clear_bit(Wpending, &m->wsched);
474 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500475 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500476 if (err == -EAGAIN) {
477 clear_bit(Wworksched, &m->wsched);
478 return;
479 }
480
481 if (err < 0)
482 goto error;
483 else if (err == 0) {
484 err = -EREMOTEIO;
485 goto error;
486 }
487
488 m->wpos += err;
489 if (m->wpos == m->wsize)
490 m->wpos = m->wsize = 0;
491
492 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
493 if (test_and_clear_bit(Wpending, &m->wsched))
494 n = POLLOUT;
495 else
496 n = p9_fd_poll(m->client, NULL);
497
498 if (n & POLLOUT) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500499 P9_DPRINTK(P9_DEBUG_TRANS, "sched write work %p\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500500 queue_work(p9_mux_wq, &m->wq);
501 } else
502 clear_bit(Wworksched, &m->wsched);
503 } else
504 clear_bit(Wworksched, &m->wsched);
505
506 return;
507
508error:
509 p9_conn_cancel(m, err);
510 clear_bit(Wworksched, &m->wsched);
511}
512
513static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key)
514{
515 struct p9_poll_wait *pwait =
516 container_of(wait, struct p9_poll_wait, wait);
517 struct p9_conn *m = pwait->conn;
518 unsigned long flags;
519 DECLARE_WAITQUEUE(dummy_wait, p9_poll_task);
520
521 spin_lock_irqsave(&p9_poll_lock, flags);
522 if (list_empty(&m->poll_pending_link))
523 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
524 spin_unlock_irqrestore(&p9_poll_lock, flags);
525
526 /* perform the default wake up operation */
527 return default_wake_function(&dummy_wait, mode, sync, key);
528}
529
530/**
531 * p9_pollwait - add poll task to the wait queue
532 * @filp: file pointer being polled
533 * @wait_address: wait_q to block on
534 * @p: poll state
535 *
536 * called by files poll operation to add v9fs-poll task to files wait queue
537 */
538
539static void
540p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
541{
542 struct p9_conn *m = container_of(p, struct p9_conn, pt);
543 struct p9_poll_wait *pwait = NULL;
544 int i;
545
546 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
547 if (m->poll_wait[i].wait_addr == NULL) {
548 pwait = &m->poll_wait[i];
549 break;
550 }
551 }
552
553 if (!pwait) {
554 P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
555 return;
556 }
557
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500558 pwait->conn = m;
559 pwait->wait_addr = wait_address;
560 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
561 add_wait_queue(wait_address, &pwait->wait);
562}
563
564/**
565 * p9_conn_create - allocate and initialize the per-session mux data
566 * @client: client instance
567 *
568 * Note: Creates the polling task if this is the first session.
569 */
570
571static struct p9_conn *p9_conn_create(struct p9_client *client)
572{
Tejun Heo95820a32008-10-13 18:45:20 -0500573 int n;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500574 struct p9_conn *m;
575
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500576 P9_DPRINTK(P9_DEBUG_TRANS, "client %p msize %d\n", client,
577 client->msize);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500578 m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
579 if (!m)
580 return ERR_PTR(-ENOMEM);
581
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500582 INIT_LIST_HEAD(&m->mux_list);
583 m->client = client;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500584
585 INIT_LIST_HEAD(&m->req_list);
586 INIT_LIST_HEAD(&m->unsent_req_list);
587 INIT_WORK(&m->rq, p9_read_work);
588 INIT_WORK(&m->wq, p9_write_work);
589 INIT_LIST_HEAD(&m->poll_pending_link);
590 init_poll_funcptr(&m->pt, p9_pollwait);
591
592 n = p9_fd_poll(client, &m->pt);
593 if (n & POLLIN) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500594 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can read\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500595 set_bit(Rpending, &m->wsched);
596 }
597
598 if (n & POLLOUT) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500599 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can write\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500600 set_bit(Wpending, &m->wsched);
601 }
602
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500603 return m;
604}
605
606/**
607 * p9_poll_mux - polls a mux and schedules read or write works if necessary
608 * @m: connection to poll
609 *
610 */
611
612static void p9_poll_mux(struct p9_conn *m)
613{
614 int n;
615
616 if (m->err < 0)
617 return;
618
619 n = p9_fd_poll(m->client, NULL);
620 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500621 P9_DPRINTK(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500622 if (n >= 0)
623 n = -ECONNRESET;
624 p9_conn_cancel(m, n);
625 }
626
627 if (n & POLLIN) {
628 set_bit(Rpending, &m->wsched);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500629 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can read\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500630 if (!test_and_set_bit(Rworksched, &m->wsched)) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500631 P9_DPRINTK(P9_DEBUG_TRANS, "sched read work %p\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500632 queue_work(p9_mux_wq, &m->rq);
633 }
634 }
635
636 if (n & POLLOUT) {
637 set_bit(Wpending, &m->wsched);
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500638 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can write\n", m);
Joe Perchesf64f9e72009-11-29 16:55:45 -0800639 if ((m->wsize || !list_empty(&m->unsent_req_list)) &&
640 !test_and_set_bit(Wworksched, &m->wsched)) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500641 P9_DPRINTK(P9_DEBUG_TRANS, "sched write work %p\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500642 queue_work(p9_mux_wq, &m->wq);
643 }
644 }
645}
646
647/**
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500648 * p9_fd_request - send 9P request
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600649 * The function can sleep until the request is scheduled for sending.
650 * The function can be interrupted. Return from the function is not
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500651 * a guarantee that the request is sent successfully.
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600652 *
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500653 * @client: client instance
654 * @req: request to be sent
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600655 *
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600656 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600657
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500658static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600659{
660 int n;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500661 struct p9_trans_fd *ts = client->trans;
662 struct p9_conn *m = ts->conn;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600663
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500664 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", m,
665 current, req->tc, req->tc->id);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600666 if (m->err < 0)
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500667 return m->err;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600668
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500669 spin_lock(&client->lock);
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500670 req->status = REQ_STATUS_UNSENT;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600671 list_add_tail(&req->req_list, &m->unsent_req_list);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500672 spin_unlock(&client->lock);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600673
674 if (test_and_clear_bit(Wpending, &m->wsched))
675 n = POLLOUT;
676 else
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500677 n = p9_fd_poll(m->client, NULL);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600678
679 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
680 queue_work(p9_mux_wq, &m->wq);
681
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500682 return 0;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600683}
684
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500685static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600686{
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500687 int ret = 1;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600688
Eric Van Hensbergen0b15a3a2008-10-22 18:47:40 -0500689 P9_DPRINTK(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600690
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500691 spin_lock(&client->lock);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500692
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500693 if (req->status == REQ_STATUS_UNSENT) {
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500694 list_del(&req->req_list);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500695 req->status = REQ_STATUS_FLSHD;
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500696 ret = 0;
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500697 } else if (req->status == REQ_STATUS_SENT)
698 req->status = REQ_STATUS_FLSH;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600699
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500700 spin_unlock(&client->lock);
701
702 return ret;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600703}
704
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600705/**
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600706 * parse_opts - parse mount options into p9_fd_opts structure
707 * @params: options string passed from mount
708 * @opts: fd transport-specific structure to parse options into
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500709 *
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600710 * Returns 0 upon success, -ERRNO upon failure
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500711 */
712
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600713static int parse_opts(char *params, struct p9_fd_opts *opts)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500714{
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500715 char *p;
716 substring_t args[MAX_OPT_ARGS];
717 int option;
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600718 char *options, *tmp_options;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500719 int ret;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500720
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500721 opts->port = P9_PORT;
722 opts->rfd = ~0;
723 opts->wfd = ~0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500724
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600725 if (!params)
726 return 0;
727
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600728 tmp_options = kstrdup(params, GFP_KERNEL);
729 if (!tmp_options) {
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600730 P9_DPRINTK(P9_DEBUG_ERROR,
731 "failed to allocate copy of option string\n");
732 return -ENOMEM;
733 }
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600734 options = tmp_options;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500735
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500736 while ((p = strsep(&options, ",")) != NULL) {
737 int token;
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600738 int r;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500739 if (!*p)
740 continue;
741 token = match_token(p, tokens, args);
Abhishek Kulkarni15da4b12009-07-01 08:50:54 +0000742 if (token != Opt_err) {
743 r = match_int(&args[0], &option);
744 if (r < 0) {
745 P9_DPRINTK(P9_DEBUG_ERROR,
746 "integer field, but no integer?\n");
747 ret = r;
748 continue;
749 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500750 }
751 switch (token) {
752 case Opt_port:
753 opts->port = option;
754 break;
755 case Opt_rfdno:
756 opts->rfd = option;
757 break;
758 case Opt_wfdno:
759 opts->wfd = option;
760 break;
761 default:
762 continue;
763 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500764 }
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600765
766 kfree(tmp_options);
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600767 return 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500768}
769
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500770static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500771{
772 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
773 GFP_KERNEL);
774 if (!ts)
775 return -ENOMEM;
776
777 ts->rd = fget(rfd);
778 ts->wr = fget(wfd);
779 if (!ts->rd || !ts->wr) {
780 if (ts->rd)
781 fput(ts->rd);
782 if (ts->wr)
783 fput(ts->wr);
784 kfree(ts);
785 return -EIO;
786 }
787
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500788 client->trans = ts;
789 client->status = Connected;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500790
791 return 0;
792}
793
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500794static int p9_socket_open(struct p9_client *client, struct socket *csocket)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500795{
Al Viro6b186622009-08-06 02:02:43 +0400796 struct p9_trans_fd *p;
797 int ret, fd;
798
799 p = kmalloc(sizeof(struct p9_trans_fd), GFP_KERNEL);
800 if (!p)
801 return -ENOMEM;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500802
803 csocket->sk->sk_allocation = GFP_NOIO;
Ulrich Dreppera677a032008-07-23 21:29:17 -0700804 fd = sock_map_fd(csocket, 0);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500805 if (fd < 0) {
806 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
Al Viro6b186622009-08-06 02:02:43 +0400807 sock_release(csocket);
808 kfree(p);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500809 return fd;
810 }
811
Al Viro6b186622009-08-06 02:02:43 +0400812 get_file(csocket->file);
813 get_file(csocket->file);
814 p->wr = p->rd = csocket->file;
815 client->trans = p;
816 client->status = Connected;
817
818 sys_close(fd); /* still racy */
819
820 p->rd->f_flags |= O_NONBLOCK;
821
822 p->conn = p9_conn_create(client);
823 if (IS_ERR(p->conn)) {
824 ret = PTR_ERR(p->conn);
825 p->conn = NULL;
826 kfree(p);
827 sockfd_put(csocket);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500828 sockfd_put(csocket);
829 return ret;
830 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500831 return 0;
832}
833
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500834/**
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500835 * p9_mux_destroy - cancels all pending requests and frees mux resources
836 * @m: mux to destroy
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500837 *
838 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600839
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500840static void p9_conn_destroy(struct p9_conn *m)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500841{
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500842 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", m,
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500843 m->mux_list.prev, m->mux_list.next);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500844
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500845 p9_mux_poll_stop(m);
846 cancel_work_sync(&m->rq);
847 cancel_work_sync(&m->wq);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500848
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500849 p9_conn_cancel(m, -ECONNRESET);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500850
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500851 m->client = NULL;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500852 kfree(m);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500853}
854
855/**
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500856 * p9_fd_close - shutdown file descriptor transport
857 * @client: client instance
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500858 *
859 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600860
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500861static void p9_fd_close(struct p9_client *client)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500862{
863 struct p9_trans_fd *ts;
864
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500865 if (!client)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500866 return;
867
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500868 ts = client->trans;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500869 if (!ts)
870 return;
871
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500872 client->status = Disconnected;
873
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600874 p9_conn_destroy(ts->conn);
875
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500876 if (ts->rd)
877 fput(ts->rd);
878 if (ts->wr)
879 fput(ts->wr);
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500880
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500881 kfree(ts);
882}
883
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500884/*
885 * stolen from NFS - maybe should be made a generic function?
886 */
887static inline int valid_ipaddr4(const char *buf)
888{
889 int rc, count, in[4];
890
891 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
892 if (rc != 4)
893 return -EINVAL;
894 for (count = 0; count < 4; count++) {
895 if (in[count] > 255)
896 return -EINVAL;
897 }
898 return 0;
899}
900
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500901static int
902p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500903{
904 int err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500905 struct socket *csocket;
906 struct sockaddr_in sin_server;
907 struct p9_fd_opts opts;
908
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600909 err = parse_opts(args, &opts);
910 if (err < 0)
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500911 return err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500912
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500913 if (valid_ipaddr4(addr) < 0)
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500914 return -EINVAL;
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500915
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500916 csocket = NULL;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500917
918 sin_server.sin_family = AF_INET;
919 sin_server.sin_addr.s_addr = in_aton(addr);
920 sin_server.sin_port = htons(opts.port);
Al Viro6b186622009-08-06 02:02:43 +0400921 err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500922
Al Viro6b186622009-08-06 02:02:43 +0400923 if (err) {
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500924 P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n");
Al Viro6b186622009-08-06 02:02:43 +0400925 return err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500926 }
927
928 err = csocket->ops->connect(csocket,
929 (struct sockaddr *)&sin_server,
930 sizeof(struct sockaddr_in), 0);
931 if (err < 0) {
932 P9_EPRINTK(KERN_ERR,
933 "p9_trans_tcp: problem connecting socket to %s\n",
934 addr);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500935 sock_release(csocket);
Al Viro6b186622009-08-06 02:02:43 +0400936 return err;
937 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500938
Al Viro6b186622009-08-06 02:02:43 +0400939 return p9_socket_open(client, csocket);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500940}
941
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500942static int
943p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500944{
945 int err;
946 struct socket *csocket;
947 struct sockaddr_un sun_server;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500948
949 csocket = NULL;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500950
Dan Carpentercff6b8a2010-07-10 11:51:54 +0200951 if (strlen(addr) >= UNIX_PATH_MAX) {
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500952 P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
953 addr);
Al Viro6b186622009-08-06 02:02:43 +0400954 return -ENAMETOOLONG;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500955 }
956
957 sun_server.sun_family = PF_UNIX;
958 strcpy(sun_server.sun_path, addr);
Al Viro6b186622009-08-06 02:02:43 +0400959 err = sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
960 if (err < 0) {
961 P9_EPRINTK(KERN_ERR, "p9_trans_unix: problem creating socket\n");
962 return err;
963 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500964 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
965 sizeof(struct sockaddr_un) - 1, 0);
966 if (err < 0) {
967 P9_EPRINTK(KERN_ERR,
968 "p9_trans_unix: problem connecting socket: %s: %d\n",
969 addr, err);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500970 sock_release(csocket);
Al Viro6b186622009-08-06 02:02:43 +0400971 return err;
972 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500973
Al Viro6b186622009-08-06 02:02:43 +0400974 return p9_socket_open(client, csocket);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500975}
976
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500977static int
978p9_fd_create(struct p9_client *client, const char *addr, char *args)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500979{
980 int err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500981 struct p9_fd_opts opts;
Al Viro6b186622009-08-06 02:02:43 +0400982 struct p9_trans_fd *p;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500983
984 parse_opts(args, &opts);
985
986 if (opts.rfd == ~0 || opts.wfd == ~0) {
987 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500988 return -ENOPROTOOPT;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500989 }
990
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500991 err = p9_fd_open(client, opts.rfd, opts.wfd);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500992 if (err < 0)
Al Viro6b186622009-08-06 02:02:43 +0400993 return err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500994
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500995 p = (struct p9_trans_fd *) client->trans;
996 p->conn = p9_conn_create(client);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600997 if (IS_ERR(p->conn)) {
998 err = PTR_ERR(p->conn);
999 p->conn = NULL;
Al Viro6b186622009-08-06 02:02:43 +04001000 fput(p->rd);
1001 fput(p->wr);
1002 return err;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06001003 }
1004
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001005 return 0;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001006}
1007
1008static struct p9_trans_module p9_tcp_trans = {
1009 .name = "tcp",
1010 .maxsize = MAX_SOCK_BUF,
1011 .def = 1,
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001012 .create = p9_fd_create_tcp,
1013 .close = p9_fd_close,
Eric Van Hensbergen91b85342008-10-13 18:45:21 -05001014 .request = p9_fd_request,
1015 .cancel = p9_fd_cancel,
Tejun Heo72029fe2008-09-24 16:22:23 -05001016 .owner = THIS_MODULE,
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001017};
1018
1019static struct p9_trans_module p9_unix_trans = {
1020 .name = "unix",
1021 .maxsize = MAX_SOCK_BUF,
1022 .def = 0,
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001023 .create = p9_fd_create_unix,
1024 .close = p9_fd_close,
Eric Van Hensbergen91b85342008-10-13 18:45:21 -05001025 .request = p9_fd_request,
1026 .cancel = p9_fd_cancel,
Tejun Heo72029fe2008-09-24 16:22:23 -05001027 .owner = THIS_MODULE,
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001028};
1029
1030static struct p9_trans_module p9_fd_trans = {
1031 .name = "fd",
1032 .maxsize = MAX_SOCK_BUF,
1033 .def = 0,
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001034 .create = p9_fd_create,
1035 .close = p9_fd_close,
Eric Van Hensbergen91b85342008-10-13 18:45:21 -05001036 .request = p9_fd_request,
1037 .cancel = p9_fd_cancel,
Tejun Heo72029fe2008-09-24 16:22:23 -05001038 .owner = THIS_MODULE,
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001039};
1040
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001041/**
1042 * p9_poll_proc - poll worker thread
1043 * @a: thread state and arguments
1044 *
1045 * polls all v9fs transports for new events and queues the appropriate
1046 * work to the work queue
1047 *
1048 */
1049
1050static int p9_poll_proc(void *a)
1051{
1052 unsigned long flags;
1053
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001054 P9_DPRINTK(P9_DEBUG_TRANS, "start %p\n", current);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001055 repeat:
1056 spin_lock_irqsave(&p9_poll_lock, flags);
1057 while (!list_empty(&p9_poll_pending_list)) {
1058 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1059 struct p9_conn,
1060 poll_pending_link);
1061 list_del_init(&conn->poll_pending_link);
1062 spin_unlock_irqrestore(&p9_poll_lock, flags);
1063
1064 p9_poll_mux(conn);
1065
1066 spin_lock_irqsave(&p9_poll_lock, flags);
1067 }
1068 spin_unlock_irqrestore(&p9_poll_lock, flags);
1069
1070 set_current_state(TASK_INTERRUPTIBLE);
1071 if (list_empty(&p9_poll_pending_list)) {
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001072 P9_DPRINTK(P9_DEBUG_TRANS, "sleeping...\n");
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001073 schedule();
1074 }
1075 __set_current_state(TASK_RUNNING);
1076
1077 if (!kthread_should_stop())
1078 goto repeat;
1079
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -05001080 P9_DPRINTK(P9_DEBUG_TRANS, "finish\n");
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001081 return 0;
1082}
1083
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -05001084int p9_trans_fd_init(void)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001085{
Tejun Heo206ca502008-09-24 16:22:23 -05001086 p9_mux_wq = create_workqueue("v9fs");
1087 if (!p9_mux_wq) {
1088 printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n");
1089 return -ENOMEM;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06001090 }
1091
Tejun Heo992b3f12008-10-13 18:45:25 -05001092 p9_poll_task = kthread_run(p9_poll_proc, NULL, "v9fs-poll");
1093 if (IS_ERR(p9_poll_task)) {
1094 destroy_workqueue(p9_mux_wq);
1095 printk(KERN_WARNING "v9fs: mux: creating poll task failed\n");
1096 return PTR_ERR(p9_poll_task);
1097 }
1098
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001099 v9fs_register_trans(&p9_tcp_trans);
1100 v9fs_register_trans(&p9_unix_trans);
1101 v9fs_register_trans(&p9_fd_trans);
1102
Andrew Morton3387b802008-03-28 14:15:57 -07001103 return 0;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001104}
Tejun Heo72029fe2008-09-24 16:22:23 -05001105
1106void p9_trans_fd_exit(void)
1107{
Tejun Heo992b3f12008-10-13 18:45:25 -05001108 kthread_stop(p9_poll_task);
Tejun Heo72029fe2008-09-24 16:22:23 -05001109 v9fs_unregister_trans(&p9_tcp_trans);
1110 v9fs_unregister_trans(&p9_unix_trans);
1111 v9fs_unregister_trans(&p9_fd_trans);
Tejun Heo206ca502008-09-24 16:22:23 -05001112
1113 destroy_workqueue(p9_mux_wq);
Tejun Heo72029fe2008-09-24 16:22:23 -05001114}