blob: 3e3d82d8ff70506c2878d4b55bf44269ed26b5cb [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;
Jim Garlick2f28c8b2013-05-29 12:15:07 -070066 int privport;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050067};
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050068
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050069/*
70 * Option Parsing (code inspired by NFS code)
71 * - a little lazy - parse all fd-transport options
72 */
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -050073
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050074enum {
75 /* Options that take integer arguments */
Latchesar Ionkov55762692007-11-06 08:02:53 -060076 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
Jim Garlick2f28c8b2013-05-29 12:15:07 -070077 /* Options that take no arguments */
78 Opt_privport,
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050079};
80
Steven Whitehousea447c092008-10-13 10:46:57 +010081static const match_table_t tokens = {
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050082 {Opt_port, "port=%u"},
83 {Opt_rfdno, "rfdno=%u"},
84 {Opt_wfdno, "wfdno=%u"},
Jim Garlick2f28c8b2013-05-29 12:15:07 -070085 {Opt_privport, "privport"},
Latchesar Ionkov55762692007-11-06 08:02:53 -060086 {Opt_err, NULL},
Eric Van Hensbergena80d9232007-10-17 14:31:07 -050087};
88
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -060089enum {
90 Rworksched = 1, /* read work scheduled or running */
91 Rpending = 2, /* can read */
92 Wworksched = 4, /* write work scheduled or running */
93 Wpending = 8, /* can write */
94};
95
Tejun Heo992b3f12008-10-13 18:45:25 -050096struct p9_poll_wait {
97 struct p9_conn *conn;
98 wait_queue_t wait;
99 wait_queue_head_t *wait_addr;
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600100};
101
102/**
103 * struct p9_conn - fd mux connection state information
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600104 * @mux_list: list link for mux to manage multiple connections (?)
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500105 * @client: reference to client instance for this connection
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600106 * @err: error state
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600107 * @req_list: accounting for requests which have been sent
108 * @unsent_req_list: accounting for requests that haven't been sent
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500109 * @req: current request being processed (if any)
110 * @tmp_buf: temporary buffer to read in header
111 * @rsize: amount to read for current frame
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600112 * @rpos: read position in current frame
113 * @rbuf: current read buffer
114 * @wpos: write position for current frame
115 * @wsize: amount of data to write for current frame
116 * @wbuf: current write buffer
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600117 * @poll_pending_link: pending links to be polled per conn
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600118 * @poll_wait: array of wait_q's for various worker threads
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600119 * @pt: poll state
120 * @rq: current read work
121 * @wq: current write work
122 * @wsched: ????
123 *
124 */
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600125
126struct p9_conn {
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600127 struct list_head mux_list;
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500128 struct p9_client *client;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600129 int err;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600130 struct list_head req_list;
131 struct list_head unsent_req_list;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500132 struct p9_req_t *req;
133 char tmp_buf[7];
134 int rsize;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600135 int rpos;
136 char *rbuf;
137 int wpos;
138 int wsize;
139 char *wbuf;
Tejun Heo992b3f12008-10-13 18:45:25 -0500140 struct list_head poll_pending_link;
141 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600142 poll_table pt;
143 struct work_struct rq;
144 struct work_struct wq;
145 unsigned long wsched;
146};
147
Simon Derr263c5822014-03-11 10:13:09 +0100148/**
149 * struct p9_trans_fd - transport state
150 * @rd: reference to file to read from
151 * @wr: reference of file to write to
152 * @conn: connection state reference
153 *
154 */
155
156struct p9_trans_fd {
157 struct file *rd;
158 struct file *wr;
159 struct p9_conn conn;
160};
161
Tejun Heoaa70c582011-02-01 11:42:43 +0100162static void p9_poll_workfn(struct work_struct *work);
163
Tejun Heo992b3f12008-10-13 18:45:25 -0500164static DEFINE_SPINLOCK(p9_poll_lock);
165static LIST_HEAD(p9_poll_pending_list);
Tejun Heoaa70c582011-02-01 11:42:43 +0100166static DECLARE_WORK(p9_poll_work, p9_poll_workfn);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600167
Jim Garlick2f28c8b2013-05-29 12:15:07 -0700168static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT;
169static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT;
170
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600171static void p9_mux_poll_stop(struct p9_conn *m)
172{
Tejun Heo992b3f12008-10-13 18:45:25 -0500173 unsigned long flags;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600174 int i;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600175
Tejun Heo992b3f12008-10-13 18:45:25 -0500176 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
177 struct p9_poll_wait *pwait = &m->poll_wait[i];
178
179 if (pwait->wait_addr) {
180 remove_wait_queue(pwait->wait_addr, &pwait->wait);
181 pwait->wait_addr = NULL;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600182 }
183 }
Tejun Heo992b3f12008-10-13 18:45:25 -0500184
185 spin_lock_irqsave(&p9_poll_lock, flags);
186 list_del_init(&m->poll_pending_link);
187 spin_unlock_irqrestore(&p9_poll_lock, flags);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600188}
189
190/**
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500191 * p9_conn_cancel - cancel all pending requests with error
192 * @m: mux data
193 * @err: error code
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600194 *
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600195 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600196
Eric Van Hensbergen51a87c52008-10-16 08:30:07 -0500197static void p9_conn_cancel(struct p9_conn *m, int err)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600198{
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500199 struct p9_req_t *req, *rtmp;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500200 unsigned long flags;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500201 LIST_HEAD(cancel_list);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600202
Joe Perches5d385152011-11-28 10:40:46 -0800203 p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500204
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500205 spin_lock_irqsave(&m->client->lock, flags);
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500206
207 if (m->err) {
208 spin_unlock_irqrestore(&m->client->lock, flags);
209 return;
210 }
211
212 m->err = err;
213
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500214 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
215 list_move(&req->req_list, &cancel_list);
Tejun Heo992b3f12008-10-13 18:45:25 -0500216 }
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500217 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
218 list_move(&req->req_list, &cancel_list);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600219 }
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500220 spin_unlock_irqrestore(&m->client->lock, flags);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600221
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500222 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
Joe Perches5d385152011-11-28 10:40:46 -0800223 p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req);
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500224 list_del(&req->req_list);
Dominique Martinet2b6e72e2014-01-17 18:31:00 +0100225 if (!req->t_err)
226 req->t_err = err;
227 p9_client_cb(m->client, req, REQ_STATUS_ERROR);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600228 }
229}
230
Julia Lawall29af9302010-09-05 09:00:21 +0000231static int
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500232p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
233{
234 int ret, n;
235 struct p9_trans_fd *ts = NULL;
236
237 if (client && client->status == Connected)
238 ts = client->trans;
239
240 if (!ts)
241 return -EREMOTEIO;
242
Al Viro72c2d532013-09-22 16:27:52 -0400243 if (!ts->rd->f_op->poll)
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500244 return -EIO;
245
Al Viro72c2d532013-09-22 16:27:52 -0400246 if (!ts->wr->f_op->poll)
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500247 return -EIO;
248
249 ret = ts->rd->f_op->poll(ts->rd, pt);
250 if (ret < 0)
251 return ret;
252
253 if (ts->rd != ts->wr) {
254 n = ts->wr->f_op->poll(ts->wr, pt);
255 if (n < 0)
256 return n;
257 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
258 }
259
260 return ret;
261}
262
263/**
264 * p9_fd_read- read from a fd
265 * @client: client instance
266 * @v: buffer to receive data into
267 * @len: size of receive buffer
268 *
269 */
270
271static int p9_fd_read(struct p9_client *client, void *v, int len)
272{
273 int ret;
274 struct p9_trans_fd *ts = NULL;
275
276 if (client && client->status != Disconnected)
277 ts = client->trans;
278
279 if (!ts)
280 return -EREMOTEIO;
281
282 if (!(ts->rd->f_flags & O_NONBLOCK))
Joe Perches5d385152011-11-28 10:40:46 -0800283 p9_debug(P9_DEBUG_ERROR, "blocking read ...\n");
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500284
285 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
286 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
287 client->status = Disconnected;
288 return ret;
289}
290
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600291/**
292 * p9_read_work - called when there is some data to be read from a transport
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600293 * @work: container of work to be done
294 *
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600295 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600296
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600297static void p9_read_work(struct work_struct *work)
298{
299 int n, err;
300 struct p9_conn *m;
Dominique Martinet2b6e72e2014-01-17 18:31:00 +0100301 int status = REQ_STATUS_ERROR;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600302
303 m = container_of(work, struct p9_conn, rq);
304
305 if (m->err < 0)
306 return;
307
Joe Perches5d385152011-11-28 10:40:46 -0800308 p9_debug(P9_DEBUG_TRANS, "start mux %p pos %d\n", m, m->rpos);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600309
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500310 if (!m->rbuf) {
311 m->rbuf = m->tmp_buf;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600312 m->rpos = 0;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500313 m->rsize = 7; /* start by reading header */
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600314 }
315
316 clear_bit(Rpending, &m->wsched);
Joe Perches5d385152011-11-28 10:40:46 -0800317 p9_debug(P9_DEBUG_TRANS, "read mux %p pos %d size: %d = %d\n",
318 m, m->rpos, m->rsize, m->rsize-m->rpos);
Eric Van Hensbergenbead27f2008-10-13 18:45:24 -0500319 err = p9_fd_read(m->client, m->rbuf + m->rpos,
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500320 m->rsize - m->rpos);
Joe Perches5d385152011-11-28 10:40:46 -0800321 p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600322 if (err == -EAGAIN) {
Simon Derr04621942012-09-17 15:16:28 +0200323 goto end_clear;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600324 }
325
326 if (err <= 0)
327 goto error;
328
329 m->rpos += err;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500330
331 if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */
332 u16 tag;
Joe Perches5d385152011-11-28 10:40:46 -0800333 p9_debug(P9_DEBUG_TRANS, "got new header\n");
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500334
335 n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */
Eric Van Hensbergenbead27f2008-10-13 18:45:24 -0500336 if (n >= m->client->msize) {
Joe Perches5d385152011-11-28 10:40:46 -0800337 p9_debug(P9_DEBUG_ERROR,
338 "requested packet size too big: %d\n", n);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600339 err = -EIO;
340 goto error;
341 }
342
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500343 tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */
Joe Perches5d385152011-11-28 10:40:46 -0800344 p9_debug(P9_DEBUG_TRANS,
345 "mux %p pkt: size: %d bytes tag: %d\n", m, n, tag);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600346
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500347 m->req = p9_tag_lookup(m->client, tag);
Simon Derr0bfd6842014-03-10 16:38:52 +0100348 if (!m->req || (m->req->status != REQ_STATUS_SENT)) {
Joe Perches5d385152011-11-28 10:40:46 -0800349 p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
350 tag);
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500351 err = -EIO;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600352 goto error;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500353 }
354
355 if (m->req->rc == NULL) {
356 m->req->rc = kmalloc(sizeof(struct p9_fcall) +
Aneesh Kumar K.Veeff66e2011-03-08 16:39:47 +0530357 m->client->msize, GFP_NOFS);
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500358 if (!m->req->rc) {
359 m->req = NULL;
360 err = -ENOMEM;
361 goto error;
362 }
363 }
364 m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall);
365 memcpy(m->rbuf, m->tmp_buf, m->rsize);
366 m->rsize = n;
367 }
368
369 /* not an else because some packets (like clunk) have no payload */
370 if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */
Joe Perches5d385152011-11-28 10:40:46 -0800371 p9_debug(P9_DEBUG_TRANS, "got new packet\n");
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500372 spin_lock(&m->client->lock);
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500373 if (m->req->status != REQ_STATUS_ERROR)
Dominique Martinet2b6e72e2014-01-17 18:31:00 +0100374 status = REQ_STATUS_RCVD;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500375 list_del(&m->req->req_list);
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500376 spin_unlock(&m->client->lock);
Dominique Martinet2b6e72e2014-01-17 18:31:00 +0100377 p9_client_cb(m->client, m->req, status);
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500378 m->rbuf = NULL;
379 m->rpos = 0;
380 m->rsize = 0;
Eric Van Hensbergen1b0a7632008-10-13 18:45:22 -0500381 m->req = NULL;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600382 }
383
Simon Derr04621942012-09-17 15:16:28 +0200384end_clear:
385 clear_bit(Rworksched, &m->wsched);
386
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600387 if (!list_empty(&m->req_list)) {
388 if (test_and_clear_bit(Rpending, &m->wsched))
389 n = POLLIN;
390 else
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500391 n = p9_fd_poll(m->client, NULL);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600392
Simon Derr04621942012-09-17 15:16:28 +0200393 if ((n & POLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) {
Joe Perches5d385152011-11-28 10:40:46 -0800394 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
Tejun Heo61edeee2011-02-01 11:42:43 +0100395 schedule_work(&m->rq);
Simon Derr04621942012-09-17 15:16:28 +0200396 }
397 }
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600398
399 return;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600400error:
401 p9_conn_cancel(m, err);
402 clear_bit(Rworksched, &m->wsched);
403}
404
405/**
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500406 * p9_fd_write - write to a socket
407 * @client: client instance
408 * @v: buffer to send data from
409 * @len: size of send buffer
410 *
411 */
412
413static int p9_fd_write(struct p9_client *client, void *v, int len)
414{
415 int ret;
416 mm_segment_t oldfs;
417 struct p9_trans_fd *ts = NULL;
418
419 if (client && client->status != Disconnected)
420 ts = client->trans;
421
422 if (!ts)
423 return -EREMOTEIO;
424
425 if (!(ts->wr->f_flags & O_NONBLOCK))
Joe Perches5d385152011-11-28 10:40:46 -0800426 p9_debug(P9_DEBUG_ERROR, "blocking write ...\n");
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500427
428 oldfs = get_fs();
429 set_fs(get_ds());
430 /* The cast to a user pointer is valid due to the set_fs() */
Hannes Edere3db6cb2009-02-25 10:31:37 +0000431 ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500432 set_fs(oldfs);
433
434 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
435 client->status = Disconnected;
436 return ret;
437}
438
439/**
440 * p9_write_work - called when a transport can send some data
441 * @work: container for work to be done
442 *
443 */
444
445static void p9_write_work(struct work_struct *work)
446{
447 int n, err;
448 struct p9_conn *m;
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500449 struct p9_req_t *req;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500450
451 m = container_of(work, struct p9_conn, wq);
452
453 if (m->err < 0) {
454 clear_bit(Wworksched, &m->wsched);
455 return;
456 }
457
458 if (!m->wsize) {
Simon Derr759f4292012-09-17 15:16:31 +0200459 spin_lock(&m->client->lock);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500460 if (list_empty(&m->unsent_req_list)) {
461 clear_bit(Wworksched, &m->wsched);
Simon Derr759f4292012-09-17 15:16:31 +0200462 spin_unlock(&m->client->lock);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500463 return;
464 }
465
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500466 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500467 req_list);
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500468 req->status = REQ_STATUS_SENT;
Joe Perches5d385152011-11-28 10:40:46 -0800469 p9_debug(P9_DEBUG_TRANS, "move req %p\n", req);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500470 list_move_tail(&req->req_list, &m->req_list);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500471
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500472 m->wbuf = req->tc->sdata;
473 m->wsize = req->tc->size;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500474 m->wpos = 0;
Eric Van Hensbergen673d62cd2008-10-13 18:45:22 -0500475 spin_unlock(&m->client->lock);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500476 }
477
Joe Perches5d385152011-11-28 10:40:46 -0800478 p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n",
479 m, m->wpos, m->wsize);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500480 clear_bit(Wpending, &m->wsched);
481 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
Joe Perches5d385152011-11-28 10:40:46 -0800482 p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);
Simon Derr584a8c12012-09-17 15:16:30 +0200483 if (err == -EAGAIN)
484 goto end_clear;
485
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500486
487 if (err < 0)
488 goto error;
489 else if (err == 0) {
490 err = -EREMOTEIO;
491 goto error;
492 }
493
494 m->wpos += err;
495 if (m->wpos == m->wsize)
496 m->wpos = m->wsize = 0;
497
Simon Derr584a8c12012-09-17 15:16:30 +0200498end_clear:
499 clear_bit(Wworksched, &m->wsched);
500
Simon Derr1957b3a2012-09-17 15:16:29 +0200501 if (m->wsize || !list_empty(&m->unsent_req_list)) {
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500502 if (test_and_clear_bit(Wpending, &m->wsched))
503 n = POLLOUT;
504 else
505 n = p9_fd_poll(m->client, NULL);
506
Simon Derr584a8c12012-09-17 15:16:30 +0200507 if ((n & POLLOUT) &&
508 !test_and_set_bit(Wworksched, &m->wsched)) {
Joe Perches5d385152011-11-28 10:40:46 -0800509 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
Tejun Heo61edeee2011-02-01 11:42:43 +0100510 schedule_work(&m->wq);
Simon Derr584a8c12012-09-17 15:16:30 +0200511 }
512 }
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500513
514 return;
515
516error:
517 p9_conn_cancel(m, err);
518 clear_bit(Wworksched, &m->wsched);
519}
520
Eric Dumazet95c96172012-04-15 05:58:06 +0000521static int p9_pollwake(wait_queue_t *wait, unsigned int mode, int sync, void *key)
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500522{
523 struct p9_poll_wait *pwait =
524 container_of(wait, struct p9_poll_wait, wait);
525 struct p9_conn *m = pwait->conn;
526 unsigned long flags;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500527
528 spin_lock_irqsave(&p9_poll_lock, flags);
529 if (list_empty(&m->poll_pending_link))
530 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
531 spin_unlock_irqrestore(&p9_poll_lock, flags);
532
Tejun Heoaa70c582011-02-01 11:42:43 +0100533 schedule_work(&p9_poll_work);
534 return 1;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500535}
536
537/**
538 * p9_pollwait - add poll task to the wait queue
539 * @filp: file pointer being polled
540 * @wait_address: wait_q to block on
541 * @p: poll state
542 *
543 * called by files poll operation to add v9fs-poll task to files wait queue
544 */
545
546static void
547p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
548{
549 struct p9_conn *m = container_of(p, struct p9_conn, pt);
550 struct p9_poll_wait *pwait = NULL;
551 int i;
552
553 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
554 if (m->poll_wait[i].wait_addr == NULL) {
555 pwait = &m->poll_wait[i];
556 break;
557 }
558 }
559
560 if (!pwait) {
Joe Perches5d385152011-11-28 10:40:46 -0800561 p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n");
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500562 return;
563 }
564
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500565 pwait->conn = m;
566 pwait->wait_addr = wait_address;
567 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
568 add_wait_queue(wait_address, &pwait->wait);
569}
570
571/**
Simon Derr263c5822014-03-11 10:13:09 +0100572 * p9_conn_create - initialize the per-session mux data
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500573 * @client: client instance
574 *
575 * Note: Creates the polling task if this is the first session.
576 */
577
Simon Derr263c5822014-03-11 10:13:09 +0100578static void p9_conn_create(struct p9_client *client)
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500579{
Tejun Heo95820a32008-10-13 18:45:20 -0500580 int n;
Simon Derr263c5822014-03-11 10:13:09 +0100581 struct p9_trans_fd *ts = client->trans;
582 struct p9_conn *m = &ts->conn;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500583
Joe Perches5d385152011-11-28 10:40:46 -0800584 p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500585
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500586 INIT_LIST_HEAD(&m->mux_list);
587 m->client = client;
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500588
589 INIT_LIST_HEAD(&m->req_list);
590 INIT_LIST_HEAD(&m->unsent_req_list);
591 INIT_WORK(&m->rq, p9_read_work);
592 INIT_WORK(&m->wq, p9_write_work);
593 INIT_LIST_HEAD(&m->poll_pending_link);
594 init_poll_funcptr(&m->pt, p9_pollwait);
595
596 n = p9_fd_poll(client, &m->pt);
597 if (n & POLLIN) {
Joe Perches5d385152011-11-28 10:40:46 -0800598 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500599 set_bit(Rpending, &m->wsched);
600 }
601
602 if (n & POLLOUT) {
Joe Perches5d385152011-11-28 10:40:46 -0800603 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500604 set_bit(Wpending, &m->wsched);
605 }
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500606}
607
608/**
609 * p9_poll_mux - polls a mux and schedules read or write works if necessary
610 * @m: connection to poll
611 *
612 */
613
614static void p9_poll_mux(struct p9_conn *m)
615{
616 int n;
617
618 if (m->err < 0)
619 return;
620
621 n = p9_fd_poll(m->client, NULL);
622 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
Joe Perches5d385152011-11-28 10:40:46 -0800623 p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500624 if (n >= 0)
625 n = -ECONNRESET;
626 p9_conn_cancel(m, n);
627 }
628
629 if (n & POLLIN) {
630 set_bit(Rpending, &m->wsched);
Joe Perches5d385152011-11-28 10:40:46 -0800631 p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500632 if (!test_and_set_bit(Rworksched, &m->wsched)) {
Joe Perches5d385152011-11-28 10:40:46 -0800633 p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m);
Tejun Heo61edeee2011-02-01 11:42:43 +0100634 schedule_work(&m->rq);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500635 }
636 }
637
638 if (n & POLLOUT) {
639 set_bit(Wpending, &m->wsched);
Joe Perches5d385152011-11-28 10:40:46 -0800640 p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m);
Joe Perchesf64f9e72009-11-29 16:55:45 -0800641 if ((m->wsize || !list_empty(&m->unsent_req_list)) &&
642 !test_and_set_bit(Wworksched, &m->wsched)) {
Joe Perches5d385152011-11-28 10:40:46 -0800643 p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m);
Tejun Heo61edeee2011-02-01 11:42:43 +0100644 schedule_work(&m->wq);
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500645 }
646 }
647}
648
649/**
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500650 * p9_fd_request - send 9P request
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600651 * The function can sleep until the request is scheduled for sending.
652 * The function can be interrupted. Return from the function is not
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500653 * a guarantee that the request is sent successfully.
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600654 *
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500655 * @client: client instance
656 * @req: request to be sent
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600657 *
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600658 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600659
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500660static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600661{
662 int n;
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500663 struct p9_trans_fd *ts = client->trans;
Simon Derr263c5822014-03-11 10:13:09 +0100664 struct p9_conn *m = &ts->conn;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600665
Joe Perches5d385152011-11-28 10:40:46 -0800666 p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n",
667 m, current, req->tc, req->tc->id);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600668 if (m->err < 0)
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500669 return m->err;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600670
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500671 spin_lock(&client->lock);
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500672 req->status = REQ_STATUS_UNSENT;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600673 list_add_tail(&req->req_list, &m->unsent_req_list);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500674 spin_unlock(&client->lock);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600675
676 if (test_and_clear_bit(Wpending, &m->wsched))
677 n = POLLOUT;
678 else
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500679 n = p9_fd_poll(m->client, NULL);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600680
681 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
Tejun Heo61edeee2011-02-01 11:42:43 +0100682 schedule_work(&m->wq);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600683
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500684 return 0;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600685}
686
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500687static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600688{
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500689 int ret = 1;
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600690
Joe Perches5d385152011-11-28 10:40:46 -0800691 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600692
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500693 spin_lock(&client->lock);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500694
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500695 if (req->status == REQ_STATUS_UNSENT) {
Latchesar Ionkov1bab88b2009-04-05 16:28:59 -0500696 list_del(&req->req_list);
Eric Van Hensbergen91b85342008-10-13 18:45:21 -0500697 req->status = REQ_STATUS_FLSHD;
Eric Van Hensbergen7eb923b2008-10-17 12:45:40 -0500698 ret = 0;
Simon Derr0bfd6842014-03-10 16:38:52 +0100699 }
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
Simon Derrafd8d652014-03-10 16:38:49 +0100705static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req)
706{
707 p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
708
709 /* we haven't received a response for oldreq,
710 * remove it from the list.
711 */
712 spin_lock(&client->lock);
713 list_del(&req->req_list);
714 spin_unlock(&client->lock);
715
716 return 0;
717}
718
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600719/**
Abhishek Kulkarni0e155972009-07-19 13:41:55 -0600720 * parse_opts - parse mount options into p9_fd_opts structure
721 * @params: options string passed from mount
722 * @opts: fd transport-specific structure to parse options into
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500723 *
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600724 * Returns 0 upon success, -ERRNO upon failure
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500725 */
726
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600727static int parse_opts(char *params, struct p9_fd_opts *opts)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500728{
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500729 char *p;
730 substring_t args[MAX_OPT_ARGS];
731 int option;
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600732 char *options, *tmp_options;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500733
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500734 opts->port = P9_PORT;
735 opts->rfd = ~0;
736 opts->wfd = ~0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500737
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600738 if (!params)
739 return 0;
740
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600741 tmp_options = kstrdup(params, GFP_KERNEL);
742 if (!tmp_options) {
Joe Perches5d385152011-11-28 10:40:46 -0800743 p9_debug(P9_DEBUG_ERROR,
744 "failed to allocate copy of option string\n");
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600745 return -ENOMEM;
746 }
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600747 options = tmp_options;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500748
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500749 while ((p = strsep(&options, ",")) != NULL) {
750 int token;
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600751 int r;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500752 if (!*p)
753 continue;
754 token = match_token(p, tokens, args);
Jim Garlick2f28c8b2013-05-29 12:15:07 -0700755 if ((token != Opt_err) && (token != Opt_privport)) {
Abhishek Kulkarni15da4b12009-07-01 08:50:54 +0000756 r = match_int(&args[0], &option);
757 if (r < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800758 p9_debug(P9_DEBUG_ERROR,
759 "integer field, but no integer?\n");
Abhishek Kulkarni15da4b12009-07-01 08:50:54 +0000760 continue;
761 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500762 }
763 switch (token) {
764 case Opt_port:
765 opts->port = option;
766 break;
767 case Opt_rfdno:
768 opts->rfd = option;
769 break;
770 case Opt_wfdno:
771 opts->wfd = option;
772 break;
Jim Garlick2f28c8b2013-05-29 12:15:07 -0700773 case Opt_privport:
774 opts->privport = 1;
775 break;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500776 default:
777 continue;
778 }
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500779 }
Eric Van Hensbergend8c8a9e2010-02-08 16:23:23 -0600780
781 kfree(tmp_options);
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600782 return 0;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500783}
784
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500785static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500786{
Simon Derr263c5822014-03-11 10:13:09 +0100787 struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd),
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500788 GFP_KERNEL);
789 if (!ts)
790 return -ENOMEM;
791
792 ts->rd = fget(rfd);
793 ts->wr = fget(wfd);
794 if (!ts->rd || !ts->wr) {
795 if (ts->rd)
796 fput(ts->rd);
797 if (ts->wr)
798 fput(ts->wr);
799 kfree(ts);
800 return -EIO;
801 }
802
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500803 client->trans = ts;
804 client->status = Connected;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500805
806 return 0;
807}
808
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500809static int p9_socket_open(struct p9_client *client, struct socket *csocket)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500810{
Al Viro6b186622009-08-06 02:02:43 +0400811 struct p9_trans_fd *p;
Al Viro56b31d12012-08-18 00:25:51 -0400812 struct file *file;
Al Viro6b186622009-08-06 02:02:43 +0400813
Simon Derr263c5822014-03-11 10:13:09 +0100814 p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL);
Al Viro6b186622009-08-06 02:02:43 +0400815 if (!p)
816 return -ENOMEM;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500817
818 csocket->sk->sk_allocation = GFP_NOIO;
Linus Torvaldsaab174f2012-10-02 20:25:04 -0700819 file = sock_alloc_file(csocket, 0, NULL);
Al Viro56b31d12012-08-18 00:25:51 -0400820 if (IS_ERR(file)) {
Joe Perches5d385152011-11-28 10:40:46 -0800821 pr_err("%s (%d): failed to map fd\n",
822 __func__, task_pid_nr(current));
Al Viro6b186622009-08-06 02:02:43 +0400823 sock_release(csocket);
824 kfree(p);
Al Viro56b31d12012-08-18 00:25:51 -0400825 return PTR_ERR(file);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500826 }
827
Al Viro56b31d12012-08-18 00:25:51 -0400828 get_file(file);
829 p->wr = p->rd = file;
Al Viro6b186622009-08-06 02:02:43 +0400830 client->trans = p;
831 client->status = Connected;
832
Al Viro6b186622009-08-06 02:02:43 +0400833 p->rd->f_flags |= O_NONBLOCK;
834
Simon Derr263c5822014-03-11 10:13:09 +0100835 p9_conn_create(client);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500836 return 0;
837}
838
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500839/**
Simon Derr263c5822014-03-11 10:13:09 +0100840 * p9_mux_destroy - cancels all pending requests of mux
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500841 * @m: mux to destroy
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500842 *
843 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600844
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500845static void p9_conn_destroy(struct p9_conn *m)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500846{
Joe Perches5d385152011-11-28 10:40:46 -0800847 p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n",
848 m, m->mux_list.prev, m->mux_list.next);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500849
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500850 p9_mux_poll_stop(m);
851 cancel_work_sync(&m->rq);
852 cancel_work_sync(&m->wq);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500853
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500854 p9_conn_cancel(m, -ECONNRESET);
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500855
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -0500856 m->client = NULL;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500857}
858
859/**
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500860 * p9_fd_close - shutdown file descriptor transport
861 * @client: client instance
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500862 *
863 */
Eric Van Hensbergenee443992008-03-05 07:08:09 -0600864
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500865static void p9_fd_close(struct p9_client *client)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500866{
867 struct p9_trans_fd *ts;
868
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500869 if (!client)
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500870 return;
871
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500872 ts = client->trans;
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500873 if (!ts)
874 return;
875
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500876 client->status = Disconnected;
877
Simon Derr263c5822014-03-11 10:13:09 +0100878 p9_conn_destroy(&ts->conn);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -0600879
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500880 if (ts->rd)
881 fput(ts->rd);
882 if (ts->wr)
883 fput(ts->wr);
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500884
Latchesar Ionkovbd238fb2007-07-10 17:57:28 -0500885 kfree(ts);
886}
887
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500888/*
889 * stolen from NFS - maybe should be made a generic function?
890 */
891static inline int valid_ipaddr4(const char *buf)
892{
893 int rc, count, in[4];
894
895 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
896 if (rc != 4)
897 return -EINVAL;
898 for (count = 0; count < 4; count++) {
899 if (in[count] > 255)
900 return -EINVAL;
901 }
902 return 0;
903}
904
Jim Garlick2f28c8b2013-05-29 12:15:07 -0700905static int p9_bind_privport(struct socket *sock)
906{
907 struct sockaddr_in cl;
908 int port, err = -EINVAL;
909
910 memset(&cl, 0, sizeof(cl));
911 cl.sin_family = AF_INET;
912 cl.sin_addr.s_addr = INADDR_ANY;
913 for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) {
914 cl.sin_port = htons((ushort)port);
915 err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl));
916 if (err != -EADDRINUSE)
917 break;
918 }
919 return err;
920}
921
922
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500923static int
924p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500925{
926 int err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500927 struct socket *csocket;
928 struct sockaddr_in sin_server;
929 struct p9_fd_opts opts;
930
Eric Van Hensbergenbb8ffdf2008-03-07 10:53:53 -0600931 err = parse_opts(args, &opts);
932 if (err < 0)
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500933 return err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500934
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500935 if (valid_ipaddr4(addr) < 0)
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500936 return -EINVAL;
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -0500937
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500938 csocket = NULL;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500939
940 sin_server.sin_family = AF_INET;
941 sin_server.sin_addr.s_addr = in_aton(addr);
942 sin_server.sin_port = htons(opts.port);
Eric W. Biederman0c5c9fb2015-03-11 23:06:44 -0500943 err = __sock_create(current->nsproxy->net_ns, PF_INET,
Rob Landleye75762f2011-05-23 21:46:56 -0500944 SOCK_STREAM, IPPROTO_TCP, &csocket, 1);
Al Viro6b186622009-08-06 02:02:43 +0400945 if (err) {
Joe Perches5d385152011-11-28 10:40:46 -0800946 pr_err("%s (%d): problem creating socket\n",
947 __func__, task_pid_nr(current));
Al Viro6b186622009-08-06 02:02:43 +0400948 return err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500949 }
950
Jim Garlick2f28c8b2013-05-29 12:15:07 -0700951 if (opts.privport) {
952 err = p9_bind_privport(csocket);
953 if (err < 0) {
954 pr_err("%s (%d): problem binding to privport\n",
955 __func__, task_pid_nr(current));
956 sock_release(csocket);
957 return err;
958 }
959 }
960
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500961 err = csocket->ops->connect(csocket,
962 (struct sockaddr *)&sin_server,
963 sizeof(struct sockaddr_in), 0);
964 if (err < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800965 pr_err("%s (%d): problem connecting socket to %s\n",
966 __func__, task_pid_nr(current), addr);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500967 sock_release(csocket);
Al Viro6b186622009-08-06 02:02:43 +0400968 return err;
969 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500970
Al Viro6b186622009-08-06 02:02:43 +0400971 return p9_socket_open(client, csocket);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500972}
973
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -0500974static int
975p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500976{
977 int err;
978 struct socket *csocket;
979 struct sockaddr_un sun_server;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500980
981 csocket = NULL;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500982
Dan Carpentercff6b8a2010-07-10 11:51:54 +0200983 if (strlen(addr) >= UNIX_PATH_MAX) {
Joe Perches5d385152011-11-28 10:40:46 -0800984 pr_err("%s (%d): address too long: %s\n",
985 __func__, task_pid_nr(current), addr);
Al Viro6b186622009-08-06 02:02:43 +0400986 return -ENAMETOOLONG;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500987 }
988
989 sun_server.sun_family = PF_UNIX;
990 strcpy(sun_server.sun_path, addr);
Eric W. Biederman0c5c9fb2015-03-11 23:06:44 -0500991 err = __sock_create(current->nsproxy->net_ns, PF_UNIX,
Rob Landleye75762f2011-05-23 21:46:56 -0500992 SOCK_STREAM, 0, &csocket, 1);
Al Viro6b186622009-08-06 02:02:43 +0400993 if (err < 0) {
Joe Perches5d385152011-11-28 10:40:46 -0800994 pr_err("%s (%d): problem creating socket\n",
995 __func__, task_pid_nr(current));
996
Al Viro6b186622009-08-06 02:02:43 +0400997 return err;
998 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -0500999 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1000 sizeof(struct sockaddr_un) - 1, 0);
1001 if (err < 0) {
Joe Perches5d385152011-11-28 10:40:46 -08001002 pr_err("%s (%d): problem connecting socket: %s: %d\n",
1003 __func__, task_pid_nr(current), addr, err);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001004 sock_release(csocket);
Al Viro6b186622009-08-06 02:02:43 +04001005 return err;
1006 }
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001007
Al Viro6b186622009-08-06 02:02:43 +04001008 return p9_socket_open(client, csocket);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001009}
1010
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001011static int
1012p9_fd_create(struct p9_client *client, const char *addr, char *args)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001013{
1014 int err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001015 struct p9_fd_opts opts;
Al Viro6b186622009-08-06 02:02:43 +04001016 struct p9_trans_fd *p;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001017
1018 parse_opts(args, &opts);
1019
1020 if (opts.rfd == ~0 || opts.wfd == ~0) {
Joe Perches5d385152011-11-28 10:40:46 -08001021 pr_err("Insufficient options for proto=fd\n");
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001022 return -ENOPROTOOPT;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001023 }
1024
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001025 err = p9_fd_open(client, opts.rfd, opts.wfd);
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001026 if (err < 0)
Al Viro6b186622009-08-06 02:02:43 +04001027 return err;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001028
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001029 p = (struct p9_trans_fd *) client->trans;
Simon Derr263c5822014-03-11 10:13:09 +01001030 p9_conn_create(client);
Eric Van Hensbergen8a0dc952008-02-06 19:25:03 -06001031
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001032 return 0;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001033}
1034
1035static struct p9_trans_module p9_tcp_trans = {
1036 .name = "tcp",
1037 .maxsize = MAX_SOCK_BUF,
Eric Van Hensbergenf94741f2013-11-12 10:20:03 -06001038 .def = 0,
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001039 .create = p9_fd_create_tcp,
1040 .close = p9_fd_close,
Eric Van Hensbergen91b85342008-10-13 18:45:21 -05001041 .request = p9_fd_request,
1042 .cancel = p9_fd_cancel,
Simon Derrafd8d652014-03-10 16:38:49 +01001043 .cancelled = p9_fd_cancelled,
Tejun Heo72029fe2008-09-24 16:22:23 -05001044 .owner = THIS_MODULE,
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001045};
1046
1047static struct p9_trans_module p9_unix_trans = {
1048 .name = "unix",
1049 .maxsize = MAX_SOCK_BUF,
1050 .def = 0,
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001051 .create = p9_fd_create_unix,
1052 .close = p9_fd_close,
Eric Van Hensbergen91b85342008-10-13 18:45:21 -05001053 .request = p9_fd_request,
1054 .cancel = p9_fd_cancel,
Simon Derrafd8d652014-03-10 16:38:49 +01001055 .cancelled = p9_fd_cancelled,
Tejun Heo72029fe2008-09-24 16:22:23 -05001056 .owner = THIS_MODULE,
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001057};
1058
1059static struct p9_trans_module p9_fd_trans = {
1060 .name = "fd",
1061 .maxsize = MAX_SOCK_BUF,
1062 .def = 0,
Eric Van Hensbergen8b81ef52008-10-13 18:45:25 -05001063 .create = p9_fd_create,
1064 .close = p9_fd_close,
Eric Van Hensbergen91b85342008-10-13 18:45:21 -05001065 .request = p9_fd_request,
1066 .cancel = p9_fd_cancel,
Simon Derrafd8d652014-03-10 16:38:49 +01001067 .cancelled = p9_fd_cancelled,
Tejun Heo72029fe2008-09-24 16:22:23 -05001068 .owner = THIS_MODULE,
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001069};
1070
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001071/**
1072 * p9_poll_proc - poll worker thread
1073 * @a: thread state and arguments
1074 *
1075 * polls all v9fs transports for new events and queues the appropriate
1076 * work to the work queue
1077 *
1078 */
1079
Tejun Heoaa70c582011-02-01 11:42:43 +01001080static void p9_poll_workfn(struct work_struct *work)
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001081{
1082 unsigned long flags;
1083
Joe Perches5d385152011-11-28 10:40:46 -08001084 p9_debug(P9_DEBUG_TRANS, "start %p\n", current);
Tejun Heoaa70c582011-02-01 11:42:43 +01001085
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001086 spin_lock_irqsave(&p9_poll_lock, flags);
1087 while (!list_empty(&p9_poll_pending_list)) {
1088 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1089 struct p9_conn,
1090 poll_pending_link);
1091 list_del_init(&conn->poll_pending_link);
1092 spin_unlock_irqrestore(&p9_poll_lock, flags);
1093
1094 p9_poll_mux(conn);
1095
1096 spin_lock_irqsave(&p9_poll_lock, flags);
1097 }
1098 spin_unlock_irqrestore(&p9_poll_lock, flags);
1099
Joe Perches5d385152011-11-28 10:40:46 -08001100 p9_debug(P9_DEBUG_TRANS, "finish\n");
Eric Van Hensbergen5503ac52008-10-13 18:45:24 -05001101}
1102
Eric Van Hensbergen887b3ec2008-05-08 20:26:37 -05001103int p9_trans_fd_init(void)
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001104{
1105 v9fs_register_trans(&p9_tcp_trans);
1106 v9fs_register_trans(&p9_unix_trans);
1107 v9fs_register_trans(&p9_fd_trans);
1108
Andrew Morton3387b802008-03-28 14:15:57 -07001109 return 0;
Eric Van Hensbergena80d9232007-10-17 14:31:07 -05001110}
Tejun Heo72029fe2008-09-24 16:22:23 -05001111
1112void p9_trans_fd_exit(void)
1113{
Tejun Heo43829732012-08-20 14:51:24 -07001114 flush_work(&p9_poll_work);
Tejun Heo72029fe2008-09-24 16:22:23 -05001115 v9fs_unregister_trans(&p9_tcp_trans);
1116 v9fs_unregister_trans(&p9_unix_trans);
1117 v9fs_unregister_trans(&p9_fd_trans);
1118}