blob: fccae26fa67441bbdb5b239eda94fb09417d87a7 [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
Joe Perches5d385152011-11-28 10:40:46 -080028#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
29
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050030#include <linux/in.h>
31#include <linux/module.h>
32#include <linux/net.h>
33#include <linux/ipv6.h>
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060034#include <linux/kthread.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050035#include <linux/errno.h>
36#include <linux/kernel.h>
37#include <linux/un.h>
38#include <linux/uaccess.h>
39#include <linux/inet.h>
40#include <linux/idr.h>
41#include <linux/file.h>
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050042#include <linux/parser.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090043#include <linux/slab.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050044#include <net/9p/9p.h>
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -050045#include <net/9p/client.h>
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050046#include <net/9p/transport.h>
47
Al Viro6b186622009-08-06 02:02:43 +040048#include <linux/syscalls.h> /* killme */
49
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050050#define P9_PORT 564
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050051#define MAX_SOCK_BUF (64*1024)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060052#define MAXPOLLWADDR 2
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050053
Eric Van Hensbergenee443992008-03-05 07:08:09 -060054/**
55 * struct p9_fd_opts - per-transport options
56 * @rfd: file descriptor for reading (trans=fd)
57 * @wfd: file descriptor for writing (trans=fd)
58 * @port: port to connect to (trans=tcp)
59 *
60 */
61
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050062struct p9_fd_opts {
63 int rfd;
64 int wfd;
65 u16 port;
66};
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050067
Eric Van Hensbergenee443992008-03-05 07:08:09 -060068/**
69 * struct p9_trans_fd - transport state
70 * @rd: reference to file to read from
71 * @wr: reference of file to write to
72 * @conn: connection state reference
73 *
74 */
75
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050076struct p9_trans_fd {
77 struct file *rd;
78 struct file *wr;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060079 struct p9_conn *conn;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050080};
81
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050082/*
83 * Option Parsing (code inspired by NFS code)
84 * - a little lazy - parse all fd-transport options
85 */
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050086
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050087enum {
88 /* Options that take integer arguments */
Latchesar Ionkov55762692007-11-06 08:02:53 -060089 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050090};
91
Steven Whitehousea447c092008-10-13 10:46:57 +010092static const match_table_t tokens = {
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050093 {Opt_port, "port=%u"},
94 {Opt_rfdno, "rfdno=%u"},
95 {Opt_wfdno, "wfdno=%u"},
Latchesar Ionkov55762692007-11-06 08:02:53 -060096 {Opt_err, NULL},
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050097};
98
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060099enum {
100 Rworksched = 1, /* read work scheduled or running */
101 Rpending = 2, /* can read */
102 Wworksched = 4, /* write work scheduled or running */
103 Wpending = 8, /* can write */
104};
105
Tejun Heo992b3f12008-10-13 18:45:25 -0500106struct p9_poll_wait {
107 struct p9_conn *conn;
108 wait_queue_t wait;
109 wait_queue_head_t *wait_addr;
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600110};
111
112/**
113 * struct p9_conn - fd mux connection state information
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600114 * @mux_list: list link for mux to manage multiple connections (?)
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500115 * @client: reference to client instance for this connection
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600116 * @err: error state
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600117 * @req_list: accounting for requests which have been sent
118 * @unsent_req_list: accounting for requests that haven't been sent
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500119 * @req: current request being processed (if any)
120 * @tmp_buf: temporary buffer to read in header
121 * @rsize: amount to read for current frame
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600122 * @rpos: read position in current frame
123 * @rbuf: current read buffer
124 * @wpos: write position for current frame
125 * @wsize: amount of data to write for current frame
126 * @wbuf: current write buffer
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600127 * @poll_pending_link: pending links to be polled per conn
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600128 * @poll_wait: array of wait_q's for various worker threads
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600129 * @pt: poll state
130 * @rq: current read work
131 * @wq: current write work
132 * @wsched: ????
133 *
134 */
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600135
136struct p9_conn {
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600137 struct list_head mux_list;
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500138 struct p9_client *client;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600139 int err;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600140 struct list_head req_list;
141 struct list_head unsent_req_list;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500142 struct p9_req_t *req;
143 char tmp_buf[7];
144 int rsize;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600145 int rpos;
146 char *rbuf;
147 int wpos;
148 int wsize;
149 char *wbuf;
Tejun Heo992b3f12008-10-13 18:45:25 -0500150 struct list_head poll_pending_link;
151 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600152 poll_table pt;
153 struct work_struct rq;
154 struct work_struct wq;
155 unsigned long wsched;
156};
157
Tejun Heoaa70c582011-02-01 11:42:43 +0100158static void p9_poll_workfn(struct work_struct *work);
159
Tejun Heo992b3f12008-10-13 18:45:25 -0500160static DEFINE_SPINLOCK(p9_poll_lock);
161static LIST_HEAD(p9_poll_pending_list);
Tejun Heoaa70c582011-02-01 11:42:43 +0100162static DECLARE_WORK(p9_poll_work, p9_poll_workfn);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600163
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600164static void p9_mux_poll_stop(struct p9_conn *m)
165{
Tejun Heo992b3f12008-10-13 18:45:25 -0500166 unsigned long flags;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600167 int i;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600168
Tejun Heo992b3f12008-10-13 18:45:25 -0500169 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
170 struct p9_poll_wait *pwait = &m->poll_wait[i];
171
172 if (pwait->wait_addr) {
173 remove_wait_queue(pwait->wait_addr, &pwait->wait);
174 pwait->wait_addr = NULL;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600175 }
176 }
Tejun Heo992b3f12008-10-13 18:45:25 -0500177
178 spin_lock_irqsave(&p9_poll_lock, flags);
179 list_del_init(&m->poll_pending_link);
180 spin_unlock_irqrestore(&p9_poll_lock, flags);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600181}
182
183/**
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500184 * p9_conn_cancel - cancel all pending requests with error
185 * @m: mux data
186 * @err: error code
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600187 *
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600188 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600189
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500190static void p9_conn_cancel(struct p9_conn *m, int err)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600191{
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500192 struct p9_req_t *req, *rtmp;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500193 unsigned long flags;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500194 LIST_HEAD(cancel_list);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600195
Joe Perches5d385152011-11-28 10:40:46 -0800196 p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500197
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500198 spin_lock_irqsave(&m->client->lock, flags);
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500199
200 if (m->err) {
201 spin_unlock_irqrestore(&m->client->lock, flags);
202 return;
203 }
204
205 m->err = err;
206
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500207 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500208 req->status = REQ_STATUS_ERROR;
209 if (!req->t_err)
210 req->t_err = err;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500211 list_move(&req->req_list, &cancel_list);
Tejun Heo992b3f12008-10-13 18:45:25 -0500212 }
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500213 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500214 req->status = REQ_STATUS_ERROR;
215 if (!req->t_err)
216 req->t_err = err;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500217 list_move(&req->req_list, &cancel_list);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600218 }
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500219 spin_unlock_irqrestore(&m->client->lock, flags);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600220
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500221 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
Joe Perches5d385152011-11-28 10:40:46 -0800222 p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req);
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500223 list_del(&req->req_list);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500224 p9_client_cb(m->client, req);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600225 }
226}
227
Julia Lawall29af9302010-09-05 09:00:21 +0000228static int
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500229p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
230{
231 int ret, n;
232 struct p9_trans_fd *ts = NULL;
233
234 if (client && client->status == Connected)
235 ts = client->trans;
236
237 if (!ts)
238 return -EREMOTEIO;
239
240 if (!ts->rd->f_op || !ts->rd->f_op->poll)
241 return -EIO;
242
243 if (!ts->wr->f_op || !ts->wr->f_op->poll)
244 return -EIO;
245
246 ret = ts->rd->f_op->poll(ts->rd, pt);
247 if (ret < 0)
248 return ret;
249
250 if (ts->rd != ts->wr) {
251 n = ts->wr->f_op->poll(ts->wr, pt);
252 if (n < 0)
253 return n;
254 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
255 }
256
257 return ret;
258}
259
260/**
261 * p9_fd_read- read from a fd
262 * @client: client instance
263 * @v: buffer to receive data into
264 * @len: size of receive buffer
265 *
266 */
267
268static int p9_fd_read(struct p9_client *client, void *v, int len)
269{
270 int ret;
271 struct p9_trans_fd *ts = NULL;
272
273 if (client && client->status != Disconnected)
274 ts = client->trans;
275
276 if (!ts)
277 return -EREMOTEIO;
278
279 if (!(ts->rd->f_flags & O_NONBLOCK))
Joe Perches5d385152011-11-28 10:40:46 -0800280 p9_debug(P9_DEBUG_ERROR, "blocking read ...\n");
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500281
282 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
283 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
284 client->status = Disconnected;
285 return ret;
286}
287
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600288/**
289 * p9_read_work - called when there is some data to be read from a transport
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600290 * @work: container of work to be done
291 *
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600292 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600293
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600294static void p9_read_work(struct work_struct *work)
295{
296 int n, err;
297 struct p9_conn *m;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600298
299 m = container_of(work, struct p9_conn, rq);
300
301 if (m->err < 0)
302 return;
303
Joe Perches5d385152011-11-28 10:40:46 -0800304 p9_debug(P9_DEBUG_TRANS, "start mux %p pos %d\n", m, m->rpos);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600305
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500306 if (!m->rbuf) {
307 m->rbuf = m->tmp_buf;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600308 m->rpos = 0;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500309 m->rsize = 7; /* start by reading header */
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600310 }
311
312 clear_bit(Rpending, &m->wsched);
Joe Perches5d385152011-11-28 10:40:46 -0800313 p9_debug(P9_DEBUG_TRANS, "read mux %p pos %d size: %d = %d\n",
314 m, m->rpos, m->rsize, m->rsize-m->rpos);
Eric Van Hensbergenbead27f2008-10-13 18:45:24 -0500315 err = p9_fd_read(m->client, m->rbuf + m->rpos,
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500316 m->rsize - m->rpos);
Joe Perches5d385152011-11-28 10:40:46 -0800317 p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600318 if (err == -EAGAIN) {
319 clear_bit(Rworksched, &m->wsched);
320 return;
321 }
322
323 if (err <= 0)
324 goto error;
325
326 m->rpos += err;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500327
328 if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */
329 u16 tag;
Joe Perches5d385152011-11-28 10:40:46 -0800330 p9_debug(P9_DEBUG_TRANS, "got new header\n");
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500331
332 n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */
Eric Van Hensbergenbead27f2008-10-13 18:45:24 -0500333 if (n >= m->client->msize) {
Joe Perches5d385152011-11-28 10:40:46 -0800334 p9_debug(P9_DEBUG_ERROR,
335 "requested packet size too big: %d\n", n);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600336 err = -EIO;
337 goto error;
338 }
339
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500340 tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */
Joe Perches5d385152011-11-28 10:40:46 -0800341 p9_debug(P9_DEBUG_TRANS,
342 "mux %p pkt: size: %d bytes tag: %d\n", m, n, tag);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600343
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500344 m->req = p9_tag_lookup(m->client, tag);
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500345 if (!m->req || (m->req->status != REQ_STATUS_SENT &&
346 m->req->status != REQ_STATUS_FLSH)) {
Joe Perches5d385152011-11-28 10:40:46 -0800347 p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
348 tag);
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500349 err = -EIO;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600350 goto error;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500351 }
352
353 if (m->req->rc == NULL) {
354 m->req->rc = kmalloc(sizeof(struct p9_fcall) +
Aneesh Kumar K.Veeff66e2011-03-08 16:39:47 +0530355 m->client->msize, GFP_NOFS);
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500356 if (!m->req->rc) {
357 m->req = NULL;
358 err = -ENOMEM;
359 goto error;
360 }
361 }
362 m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall);
363 memcpy(m->rbuf, m->tmp_buf, m->rsize);
364 m->rsize = n;
365 }
366
367 /* not an else because some packets (like clunk) have no payload */
368 if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */
Joe Perches5d385152011-11-28 10:40:46 -0800369 p9_debug(P9_DEBUG_TRANS, "got new packet\n");
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500370 spin_lock(&m->client->lock);
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500371 if (m->req->status != REQ_STATUS_ERROR)
372 m->req->status = REQ_STATUS_RCVD;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500373 list_del(&m->req->req_list);
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500374 spin_unlock(&m->client->lock);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500375 p9_client_cb(m->client, m->req);
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500376 m->rbuf = NULL;
377 m->rpos = 0;
378 m->rsize = 0;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500379 m->req = NULL;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600380 }
381
382 if (!list_empty(&m->req_list)) {
383 if (test_and_clear_bit(Rpending, &m->wsched))
384 n = POLLIN;
385 else
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500386 n = p9_fd_poll(m->client, NULL);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600387
388 if (n & POLLIN) {
Joe Perches5d385152011-11-28 10:40:46 -0800389 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
Tejun Heo61edeee2011-02-01 11:42:43 +0100390 schedule_work(&m->rq);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600391 } else
392 clear_bit(Rworksched, &m->wsched);
393 } else
394 clear_bit(Rworksched, &m->wsched);
395
396 return;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600397error:
398 p9_conn_cancel(m, err);
399 clear_bit(Rworksched, &m->wsched);
400}
401
402/**
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500403 * p9_fd_write - write to a socket
404 * @client: client instance
405 * @v: buffer to send data from
406 * @len: size of send buffer
407 *
408 */
409
410static int p9_fd_write(struct p9_client *client, void *v, int len)
411{
412 int ret;
413 mm_segment_t oldfs;
414 struct p9_trans_fd *ts = NULL;
415
416 if (client && client->status != Disconnected)
417 ts = client->trans;
418
419 if (!ts)
420 return -EREMOTEIO;
421
422 if (!(ts->wr->f_flags & O_NONBLOCK))
Joe Perches5d385152011-11-28 10:40:46 -0800423 p9_debug(P9_DEBUG_ERROR, "blocking write ...\n");
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500424
425 oldfs = get_fs();
426 set_fs(get_ds());
427 /* The cast to a user pointer is valid due to the set_fs() */
Hannes Edere3db6cb2009-02-25 10:31:37 +0000428 ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500429 set_fs(oldfs);
430
431 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
432 client->status = Disconnected;
433 return ret;
434}
435
436/**
437 * p9_write_work - called when a transport can send some data
438 * @work: container for work to be done
439 *
440 */
441
442static void p9_write_work(struct work_struct *work)
443{
444 int n, err;
445 struct p9_conn *m;
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500446 struct p9_req_t *req;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500447
448 m = container_of(work, struct p9_conn, wq);
449
450 if (m->err < 0) {
451 clear_bit(Wworksched, &m->wsched);
452 return;
453 }
454
455 if (!m->wsize) {
456 if (list_empty(&m->unsent_req_list)) {
457 clear_bit(Wworksched, &m->wsched);
458 return;
459 }
460
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500461 spin_lock(&m->client->lock);
462 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500463 req_list);
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500464 req->status = REQ_STATUS_SENT;
Joe Perches5d385152011-11-28 10:40:46 -0800465 p9_debug(P9_DEBUG_TRANS, "move req %p\n", req);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500466 list_move_tail(&req->req_list, &m->req_list);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500467
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500468 m->wbuf = req->tc->sdata;
469 m->wsize = req->tc->size;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500470 m->wpos = 0;
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500471 spin_unlock(&m->client->lock);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500472 }
473
Joe Perches5d385152011-11-28 10:40:46 -0800474 p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n",
475 m, m->wpos, m->wsize);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500476 clear_bit(Wpending, &m->wsched);
477 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
Joe Perches5d385152011-11-28 10:40:46 -0800478 p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500479 if (err == -EAGAIN) {
480 clear_bit(Wworksched, &m->wsched);
481 return;
482 }
483
484 if (err < 0)
485 goto error;
486 else if (err == 0) {
487 err = -EREMOTEIO;
488 goto error;
489 }
490
491 m->wpos += err;
492 if (m->wpos == m->wsize)
493 m->wpos = m->wsize = 0;
494
495 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
496 if (test_and_clear_bit(Wpending, &m->wsched))
497 n = POLLOUT;
498 else
499 n = p9_fd_poll(m->client, NULL);
500
501 if (n & POLLOUT) {
Joe Perches5d385152011-11-28 10:40:46 -0800502 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
Tejun Heo61edeee2011-02-01 11:42:43 +0100503 schedule_work(&m->wq);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500504 } else
505 clear_bit(Wworksched, &m->wsched);
506 } else
507 clear_bit(Wworksched, &m->wsched);
508
509 return;
510
511error:
512 p9_conn_cancel(m, err);
513 clear_bit(Wworksched, &m->wsched);
514}
515
516static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key)
517{
518 struct p9_poll_wait *pwait =
519 container_of(wait, struct p9_poll_wait, wait);
520 struct p9_conn *m = pwait->conn;
521 unsigned long flags;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500522
523 spin_lock_irqsave(&p9_poll_lock, flags);
524 if (list_empty(&m->poll_pending_link))
525 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
526 spin_unlock_irqrestore(&p9_poll_lock, flags);
527
Tejun Heoaa70c582011-02-01 11:42:43 +0100528 schedule_work(&p9_poll_work);
529 return 1;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500530}
531
532/**
533 * p9_pollwait - add poll task to the wait queue
534 * @filp: file pointer being polled
535 * @wait_address: wait_q to block on
536 * @p: poll state
537 *
538 * called by files poll operation to add v9fs-poll task to files wait queue
539 */
540
541static void
542p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
543{
544 struct p9_conn *m = container_of(p, struct p9_conn, pt);
545 struct p9_poll_wait *pwait = NULL;
546 int i;
547
548 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
549 if (m->poll_wait[i].wait_addr == NULL) {
550 pwait = &m->poll_wait[i];
551 break;
552 }
553 }
554
555 if (!pwait) {
Joe Perches5d385152011-11-28 10:40:46 -0800556 p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n");
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500557 return;
558 }
559
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500560 pwait->conn = m;
561 pwait->wait_addr = wait_address;
562 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
563 add_wait_queue(wait_address, &pwait->wait);
564}
565
566/**
567 * p9_conn_create - allocate and initialize the per-session mux data
568 * @client: client instance
569 *
570 * Note: Creates the polling task if this is the first session.
571 */
572
573static struct p9_conn *p9_conn_create(struct p9_client *client)
574{
Tejun Heo95820a32008-10-13 18:45:20 -0500575 int n;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500576 struct p9_conn *m;
577
Joe Perches5d385152011-11-28 10:40:46 -0800578 p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500579 m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
580 if (!m)
581 return ERR_PTR(-ENOMEM);
582
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500583 INIT_LIST_HEAD(&m->mux_list);
584 m->client = client;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500585
586 INIT_LIST_HEAD(&m->req_list);
587 INIT_LIST_HEAD(&m->unsent_req_list);
588 INIT_WORK(&m->rq, p9_read_work);
589 INIT_WORK(&m->wq, p9_write_work);
590 INIT_LIST_HEAD(&m->poll_pending_link);
591 init_poll_funcptr(&m->pt, p9_pollwait);
592
593 n = p9_fd_poll(client, &m->pt);
594 if (n & POLLIN) {
Joe Perches5d385152011-11-28 10:40:46 -0800595 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500596 set_bit(Rpending, &m->wsched);
597 }
598
599 if (n & POLLOUT) {
Joe Perches5d385152011-11-28 10:40:46 -0800600 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500601 set_bit(Wpending, &m->wsched);
602 }
603
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500604 return m;
605}
606
607/**
608 * p9_poll_mux - polls a mux and schedules read or write works if necessary
609 * @m: connection to poll
610 *
611 */
612
613static void p9_poll_mux(struct p9_conn *m)
614{
615 int n;
616
617 if (m->err < 0)
618 return;
619
620 n = p9_fd_poll(m->client, NULL);
621 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
Joe Perches5d385152011-11-28 10:40:46 -0800622 p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500623 if (n >= 0)
624 n = -ECONNRESET;
625 p9_conn_cancel(m, n);
626 }
627
628 if (n & POLLIN) {
629 set_bit(Rpending, &m->wsched);
Joe Perches5d385152011-11-28 10:40:46 -0800630 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500631 if (!test_and_set_bit(Rworksched, &m->wsched)) {
Joe Perches5d385152011-11-28 10:40:46 -0800632 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
Tejun Heo61edeee2011-02-01 11:42:43 +0100633 schedule_work(&m->rq);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500634 }
635 }
636
637 if (n & POLLOUT) {
638 set_bit(Wpending, &m->wsched);
Joe Perches5d385152011-11-28 10:40:46 -0800639 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
Joe Perchesf64f9e72009-11-29 16:55:45 -0800640 if ((m->wsize || !list_empty(&m->unsent_req_list)) &&
641 !test_and_set_bit(Wworksched, &m->wsched)) {
Joe Perches5d385152011-11-28 10:40:46 -0800642 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
Tejun Heo61edeee2011-02-01 11:42:43 +0100643 schedule_work(&m->wq);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500644 }
645 }
646}
647
648/**
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500649 * p9_fd_request - send 9P request
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600650 * The function can sleep until the request is scheduled for sending.
651 * The function can be interrupted. Return from the function is not
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500652 * a guarantee that the request is sent successfully.
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600653 *
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500654 * @client: client instance
655 * @req: request to be sent
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600656 *
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600657 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600658
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500659static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600660{
661 int n;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500662 struct p9_trans_fd *ts = client->trans;
663 struct p9_conn *m = ts->conn;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600664
Joe Perches5d385152011-11-28 10:40:46 -0800665 p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n",
666 m, current, req->tc, req->tc->id);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600667 if (m->err < 0)
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500668 return m->err;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600669
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500670 spin_lock(&client->lock);
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500671 req->status = REQ_STATUS_UNSENT;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600672 list_add_tail(&req->req_list, &m->unsent_req_list);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500673 spin_unlock(&client->lock);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600674
675 if (test_and_clear_bit(Wpending, &m->wsched))
676 n = POLLOUT;
677 else
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500678 n = p9_fd_poll(m->client, NULL);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600679
680 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
Tejun Heo61edeee2011-02-01 11:42:43 +0100681 schedule_work(&m->wq);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600682
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500683 return 0;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600684}
685
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500686static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600687{
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500688 int ret = 1;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600689
Joe Perches5d385152011-11-28 10:40:46 -0800690 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600691
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500692 spin_lock(&client->lock);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500693
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500694 if (req->status == REQ_STATUS_UNSENT) {
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500695 list_del(&req->req_list);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500696 req->status = REQ_STATUS_FLSHD;
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500697 ret = 0;
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500698 } else if (req->status == REQ_STATUS_SENT)
699 req->status = REQ_STATUS_FLSH;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600700
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500701 spin_unlock(&client->lock);
702
703 return ret;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600704}
705
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600706/**
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600707 * parse_opts - parse mount options into p9_fd_opts structure
708 * @params: options string passed from mount
709 * @opts: fd transport-specific structure to parse options into
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500710 *
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600711 * Returns 0 upon success, -ERRNO upon failure
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500712 */
713
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600714static int parse_opts(char *params, struct p9_fd_opts *opts)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500715{
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500716 char *p;
717 substring_t args[MAX_OPT_ARGS];
718 int option;
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600719 char *options, *tmp_options;
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) {
Joe Perches5d385152011-11-28 10:40:46 -0800730 p9_debug(P9_DEBUG_ERROR,
731 "failed to allocate copy of option string\n");
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600732 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) {
Joe Perches5d385152011-11-28 10:40:46 -0800745 p9_debug(P9_DEBUG_ERROR,
746 "integer field, but no integer?\n");
Abhishek Kulkarni15da4b12009-07-01 08:50:54 +0000747 continue;
748 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500749 }
750 switch (token) {
751 case Opt_port:
752 opts->port = option;
753 break;
754 case Opt_rfdno:
755 opts->rfd = option;
756 break;
757 case Opt_wfdno:
758 opts->wfd = option;
759 break;
760 default:
761 continue;
762 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500763 }
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600764
765 kfree(tmp_options);
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600766 return 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500767}
768
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500769static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500770{
771 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
772 GFP_KERNEL);
773 if (!ts)
774 return -ENOMEM;
775
776 ts->rd = fget(rfd);
777 ts->wr = fget(wfd);
778 if (!ts->rd || !ts->wr) {
779 if (ts->rd)
780 fput(ts->rd);
781 if (ts->wr)
782 fput(ts->wr);
783 kfree(ts);
784 return -EIO;
785 }
786
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500787 client->trans = ts;
788 client->status = Connected;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500789
790 return 0;
791}
792
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500793static int p9_socket_open(struct p9_client *client, struct socket *csocket)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500794{
Al Viro6b186622009-08-06 02:02:43 +0400795 struct p9_trans_fd *p;
796 int ret, fd;
797
798 p = kmalloc(sizeof(struct p9_trans_fd), GFP_KERNEL);
799 if (!p)
800 return -ENOMEM;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500801
802 csocket->sk->sk_allocation = GFP_NOIO;
Ulrich Dreppera677a032008-07-23 21:29:17 -0700803 fd = sock_map_fd(csocket, 0);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500804 if (fd < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800805 pr_err("%s (%d): failed to map fd\n",
806 __func__, task_pid_nr(current));
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{
Joe Perches5d385152011-11-28 10:40:46 -0800842 p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n",
843 m, 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);
Rob Landleye75762f2011-05-23 21:46:56 -0500921 err = __sock_create(read_pnet(&current->nsproxy->net_ns), PF_INET,
922 SOCK_STREAM, IPPROTO_TCP, &csocket, 1);
Al Viro6b186622009-08-06 02:02:43 +0400923 if (err) {
Joe Perches5d385152011-11-28 10:40:46 -0800924 pr_err("%s (%d): problem creating socket\n",
925 __func__, task_pid_nr(current));
Al Viro6b186622009-08-06 02:02:43 +0400926 return err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500927 }
928
929 err = csocket->ops->connect(csocket,
930 (struct sockaddr *)&sin_server,
931 sizeof(struct sockaddr_in), 0);
932 if (err < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800933 pr_err("%s (%d): problem connecting socket to %s\n",
934 __func__, task_pid_nr(current), 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) {
Joe Perches5d385152011-11-28 10:40:46 -0800952 pr_err("%s (%d): address too long: %s\n",
953 __func__, task_pid_nr(current), 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);
Rob Landleye75762f2011-05-23 21:46:56 -0500959 err = __sock_create(read_pnet(&current->nsproxy->net_ns), PF_UNIX,
960 SOCK_STREAM, 0, &csocket, 1);
Al Viro6b186622009-08-06 02:02:43 +0400961 if (err < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800962 pr_err("%s (%d): problem creating socket\n",
963 __func__, task_pid_nr(current));
964
Al Viro6b186622009-08-06 02:02:43 +0400965 return err;
966 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500967 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
968 sizeof(struct sockaddr_un) - 1, 0);
969 if (err < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800970 pr_err("%s (%d): problem connecting socket: %s: %d\n",
971 __func__, task_pid_nr(current), addr, err);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500972 sock_release(csocket);
Al Viro6b186622009-08-06 02:02:43 +0400973 return err;
974 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500975
Al Viro6b186622009-08-06 02:02:43 +0400976 return p9_socket_open(client, csocket);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500977}
978
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500979static int
980p9_fd_create(struct p9_client *client, const char *addr, char *args)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500981{
982 int err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500983 struct p9_fd_opts opts;
Al Viro6b186622009-08-06 02:02:43 +0400984 struct p9_trans_fd *p;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500985
986 parse_opts(args, &opts);
987
988 if (opts.rfd == ~0 || opts.wfd == ~0) {
Joe Perches5d385152011-11-28 10:40:46 -0800989 pr_err("Insufficient options for proto=fd\n");
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500990 return -ENOPROTOOPT;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500991 }
992
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500993 err = p9_fd_open(client, opts.rfd, opts.wfd);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500994 if (err < 0)
Al Viro6b186622009-08-06 02:02:43 +0400995 return err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500996
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500997 p = (struct p9_trans_fd *) client->trans;
998 p->conn = p9_conn_create(client);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600999 if (IS_ERR(p->conn)) {
1000 err = PTR_ERR(p->conn);
1001 p->conn = NULL;
Al Viro6b186622009-08-06 02:02:43 +04001002 fput(p->rd);
1003 fput(p->wr);
1004 return err;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06001005 }
1006
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001007 return 0;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001008}
1009
1010static struct p9_trans_module p9_tcp_trans = {
1011 .name = "tcp",
1012 .maxsize = MAX_SOCK_BUF,
1013 .def = 1,
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001014 .create = p9_fd_create_tcp,
1015 .close = p9_fd_close,
Eric Van Hensbergen91b85342008-10-13 18:45:21 -05001016 .request = p9_fd_request,
1017 .cancel = p9_fd_cancel,
Tejun Heo72029fe2008-09-24 16:22:23 -05001018 .owner = THIS_MODULE,
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001019};
1020
1021static struct p9_trans_module p9_unix_trans = {
1022 .name = "unix",
1023 .maxsize = MAX_SOCK_BUF,
1024 .def = 0,
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001025 .create = p9_fd_create_unix,
1026 .close = p9_fd_close,
Eric Van Hensbergen91b85342008-10-13 18:45:21 -05001027 .request = p9_fd_request,
1028 .cancel = p9_fd_cancel,
Tejun Heo72029fe2008-09-24 16:22:23 -05001029 .owner = THIS_MODULE,
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001030};
1031
1032static struct p9_trans_module p9_fd_trans = {
1033 .name = "fd",
1034 .maxsize = MAX_SOCK_BUF,
1035 .def = 0,
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001036 .create = p9_fd_create,
1037 .close = p9_fd_close,
Eric Van Hensbergen91b85342008-10-13 18:45:21 -05001038 .request = p9_fd_request,
1039 .cancel = p9_fd_cancel,
Tejun Heo72029fe2008-09-24 16:22:23 -05001040 .owner = THIS_MODULE,
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001041};
1042
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001043/**
1044 * p9_poll_proc - poll worker thread
1045 * @a: thread state and arguments
1046 *
1047 * polls all v9fs transports for new events and queues the appropriate
1048 * work to the work queue
1049 *
1050 */
1051
Tejun Heoaa70c582011-02-01 11:42:43 +01001052static void p9_poll_workfn(struct work_struct *work)
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001053{
1054 unsigned long flags;
1055
Joe Perches5d385152011-11-28 10:40:46 -08001056 p9_debug(P9_DEBUG_TRANS, "start %p\n", current);
Tejun Heoaa70c582011-02-01 11:42:43 +01001057
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001058 spin_lock_irqsave(&p9_poll_lock, flags);
1059 while (!list_empty(&p9_poll_pending_list)) {
1060 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1061 struct p9_conn,
1062 poll_pending_link);
1063 list_del_init(&conn->poll_pending_link);
1064 spin_unlock_irqrestore(&p9_poll_lock, flags);
1065
1066 p9_poll_mux(conn);
1067
1068 spin_lock_irqsave(&p9_poll_lock, flags);
1069 }
1070 spin_unlock_irqrestore(&p9_poll_lock, flags);
1071
Joe Perches5d385152011-11-28 10:40:46 -08001072 p9_debug(P9_DEBUG_TRANS, "finish\n");
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001073}
1074
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -05001075int p9_trans_fd_init(void)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001076{
1077 v9fs_register_trans(&p9_tcp_trans);
1078 v9fs_register_trans(&p9_unix_trans);
1079 v9fs_register_trans(&p9_fd_trans);
1080
Andrew Morton3387b802008-03-28 14:15:57 -07001081 return 0;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001082}
Tejun Heo72029fe2008-09-24 16:22:23 -05001083
1084void p9_trans_fd_exit(void)
1085{
Tejun Heoaa70c582011-02-01 11:42:43 +01001086 flush_work_sync(&p9_poll_work);
Tejun Heo72029fe2008-09-24 16:22:23 -05001087 v9fs_unregister_trans(&p9_tcp_trans);
1088 v9fs_unregister_trans(&p9_unix_trans);
1089 v9fs_unregister_trans(&p9_fd_trans);
1090}