Commit | Line | Data |
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bd238fb4 LI |
1 | /* |
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> | |
8a0dc95f | 8 | * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> |
bd238fb4 LI |
9 | * 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 | ||
5d385153 JP |
28 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
29 | ||
bd238fb4 LI |
30 | #include <linux/in.h> |
31 | #include <linux/module.h> | |
32 | #include <linux/net.h> | |
33 | #include <linux/ipv6.h> | |
8a0dc95f | 34 | #include <linux/kthread.h> |
bd238fb4 LI |
35 | #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> | |
a80d923e | 42 | #include <linux/parser.h> |
5a0e3ad6 | 43 | #include <linux/slab.h> |
bd238fb4 | 44 | #include <net/9p/9p.h> |
8b81ef58 | 45 | #include <net/9p/client.h> |
bd238fb4 LI |
46 | #include <net/9p/transport.h> |
47 | ||
6b18662e AV |
48 | #include <linux/syscalls.h> /* killme */ |
49 | ||
bd238fb4 | 50 | #define P9_PORT 564 |
a80d923e | 51 | #define MAX_SOCK_BUF (64*1024) |
8a0dc95f | 52 | #define MAXPOLLWADDR 2 |
a80d923e | 53 | |
ee443996 EVH |
54 | /** |
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 | ||
a80d923e EVH |
62 | struct p9_fd_opts { |
63 | int rfd; | |
64 | int wfd; | |
65 | u16 port; | |
2f28c8b3 | 66 | int privport; |
a80d923e | 67 | }; |
bd238fb4 | 68 | |
a80d923e EVH |
69 | /* |
70 | * Option Parsing (code inspired by NFS code) | |
71 | * - a little lazy - parse all fd-transport options | |
72 | */ | |
bd238fb4 | 73 | |
a80d923e EVH |
74 | enum { |
75 | /* Options that take integer arguments */ | |
55762690 | 76 | Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
2f28c8b3 JG |
77 | /* Options that take no arguments */ |
78 | Opt_privport, | |
a80d923e | 79 | }; |
bd238fb4 | 80 | |
a447c093 | 81 | static const match_table_t tokens = { |
a80d923e EVH |
82 | {Opt_port, "port=%u"}, |
83 | {Opt_rfdno, "rfdno=%u"}, | |
84 | {Opt_wfdno, "wfdno=%u"}, | |
2f28c8b3 | 85 | {Opt_privport, "privport"}, |
55762690 | 86 | {Opt_err, NULL}, |
a80d923e | 87 | }; |
bd238fb4 | 88 | |
8a0dc95f EVH |
89 | enum { |
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 | ||
992b3f1d TH |
96 | struct p9_poll_wait { |
97 | struct p9_conn *conn; | |
98 | wait_queue_t wait; | |
99 | wait_queue_head_t *wait_addr; | |
ee443996 EVH |
100 | }; |
101 | ||
102 | /** | |
103 | * struct p9_conn - fd mux connection state information | |
ee443996 | 104 | * @mux_list: list link for mux to manage multiple connections (?) |
8b81ef58 | 105 | * @client: reference to client instance for this connection |
ee443996 | 106 | * @err: error state |
ee443996 EVH |
107 | * @req_list: accounting for requests which have been sent |
108 | * @unsent_req_list: accounting for requests that haven't been sent | |
1b0a763b EVH |
109 | * @req: current request being processed (if any) |
110 | * @tmp_buf: temporary buffer to read in header | |
947867aa | 111 | * @rc: temporary fcall for reading current frame |
ee443996 EVH |
112 | * @wpos: write position for current frame |
113 | * @wsize: amount of data to write for current frame | |
114 | * @wbuf: current write buffer | |
0e15597e | 115 | * @poll_pending_link: pending links to be polled per conn |
ee443996 | 116 | * @poll_wait: array of wait_q's for various worker threads |
ee443996 EVH |
117 | * @pt: poll state |
118 | * @rq: current read work | |
119 | * @wq: current write work | |
120 | * @wsched: ???? | |
121 | * | |
122 | */ | |
8a0dc95f EVH |
123 | |
124 | struct p9_conn { | |
8a0dc95f | 125 | struct list_head mux_list; |
8b81ef58 | 126 | struct p9_client *client; |
8a0dc95f | 127 | int err; |
8a0dc95f EVH |
128 | struct list_head req_list; |
129 | struct list_head unsent_req_list; | |
1b0a763b EVH |
130 | struct p9_req_t *req; |
131 | char tmp_buf[7]; | |
947867aa | 132 | struct p9_fcall rc; |
8a0dc95f EVH |
133 | int wpos; |
134 | int wsize; | |
135 | char *wbuf; | |
992b3f1d TH |
136 | struct list_head poll_pending_link; |
137 | struct p9_poll_wait poll_wait[MAXPOLLWADDR]; | |
8a0dc95f EVH |
138 | poll_table pt; |
139 | struct work_struct rq; | |
140 | struct work_struct wq; | |
141 | unsigned long wsched; | |
142 | }; | |
143 | ||
263c5828 SD |
144 | /** |
145 | * struct p9_trans_fd - transport state | |
146 | * @rd: reference to file to read from | |
147 | * @wr: reference of file to write to | |
148 | * @conn: connection state reference | |
149 | * | |
150 | */ | |
151 | ||
152 | struct p9_trans_fd { | |
153 | struct file *rd; | |
154 | struct file *wr; | |
155 | struct p9_conn conn; | |
156 | }; | |
157 | ||
aa70c585 TH |
158 | static void p9_poll_workfn(struct work_struct *work); |
159 | ||
992b3f1d TH |
160 | static DEFINE_SPINLOCK(p9_poll_lock); |
161 | static LIST_HEAD(p9_poll_pending_list); | |
aa70c585 | 162 | static DECLARE_WORK(p9_poll_work, p9_poll_workfn); |
8a0dc95f | 163 | |
2f28c8b3 JG |
164 | static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT; |
165 | static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT; | |
166 | ||
992b3f1d | 167 | static void p9_mux_poll_stop(struct p9_conn *m) |
8a0dc95f | 168 | { |
992b3f1d TH |
169 | unsigned long flags; |
170 | int i; | |
8a0dc95f | 171 | |
992b3f1d TH |
172 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
173 | struct p9_poll_wait *pwait = &m->poll_wait[i]; | |
8a0dc95f | 174 | |
992b3f1d TH |
175 | if (pwait->wait_addr) { |
176 | remove_wait_queue(pwait->wait_addr, &pwait->wait); | |
177 | pwait->wait_addr = NULL; | |
8a0dc95f | 178 | } |
8a0dc95f EVH |
179 | } |
180 | ||
992b3f1d TH |
181 | spin_lock_irqsave(&p9_poll_lock, flags); |
182 | list_del_init(&m->poll_pending_link); | |
183 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
8a0dc95f EVH |
184 | } |
185 | ||
186 | /** | |
5503ac56 EVH |
187 | * p9_conn_cancel - cancel all pending requests with error |
188 | * @m: mux data | |
189 | * @err: error code | |
8a0dc95f | 190 | * |
8a0dc95f | 191 | */ |
ee443996 | 192 | |
51a87c55 | 193 | static void p9_conn_cancel(struct p9_conn *m, int err) |
8a0dc95f | 194 | { |
673d62cd | 195 | struct p9_req_t *req, *rtmp; |
91b8534f | 196 | unsigned long flags; |
5503ac56 | 197 | LIST_HEAD(cancel_list); |
8a0dc95f | 198 | |
5d385153 | 199 | p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); |
7eb923b8 | 200 | |
91b8534f | 201 | spin_lock_irqsave(&m->client->lock, flags); |
7eb923b8 EVH |
202 | |
203 | if (m->err) { | |
204 | spin_unlock_irqrestore(&m->client->lock, flags); | |
205 | return; | |
206 | } | |
207 | ||
208 | m->err = err; | |
209 | ||
5503ac56 EVH |
210 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { |
211 | list_move(&req->req_list, &cancel_list); | |
212 | } | |
213 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { | |
214 | list_move(&req->req_list, &cancel_list); | |
8a0dc95f | 215 | } |
91b8534f | 216 | spin_unlock_irqrestore(&m->client->lock, flags); |
8a0dc95f | 217 | |
5503ac56 | 218 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { |
5d385153 | 219 | p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req); |
1bab88b2 | 220 | list_del(&req->req_list); |
2b6e72ed DM |
221 | if (!req->t_err) |
222 | req->t_err = err; | |
223 | p9_client_cb(m->client, req, REQ_STATUS_ERROR); | |
8a0dc95f | 224 | } |
8a0dc95f EVH |
225 | } |
226 | ||
29af9309 | 227 | static int |
5503ac56 | 228 | p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt) |
8a0dc95f | 229 | { |
5503ac56 EVH |
230 | int ret, n; |
231 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 232 | |
5503ac56 EVH |
233 | if (client && client->status == Connected) |
234 | ts = client->trans; | |
7dc5d24b | 235 | |
5503ac56 EVH |
236 | if (!ts) |
237 | return -EREMOTEIO; | |
7dc5d24b | 238 | |
72c2d531 | 239 | if (!ts->rd->f_op->poll) |
5503ac56 | 240 | return -EIO; |
8a0dc95f | 241 | |
72c2d531 | 242 | if (!ts->wr->f_op->poll) |
5503ac56 | 243 | return -EIO; |
992b3f1d | 244 | |
5503ac56 EVH |
245 | ret = ts->rd->f_op->poll(ts->rd, pt); |
246 | if (ret < 0) | |
247 | return ret; | |
992b3f1d | 248 | |
5503ac56 EVH |
249 | if (ts->rd != ts->wr) { |
250 | n = ts->wr->f_op->poll(ts->wr, pt); | |
251 | if (n < 0) | |
252 | return n; | |
253 | ret = (ret & ~POLLOUT) | (n & ~POLLIN); | |
254 | } | |
255 | ||
256 | return ret; | |
992b3f1d TH |
257 | } |
258 | ||
8a0dc95f | 259 | /** |
5503ac56 EVH |
260 | * p9_fd_read- read from a fd |
261 | * @client: client instance | |
262 | * @v: buffer to receive data into | |
263 | * @len: size of receive buffer | |
ee443996 | 264 | * |
8a0dc95f | 265 | */ |
ee443996 | 266 | |
5503ac56 | 267 | static int p9_fd_read(struct p9_client *client, void *v, int len) |
8a0dc95f | 268 | { |
5503ac56 EVH |
269 | int ret; |
270 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 271 | |
5503ac56 EVH |
272 | if (client && client->status != Disconnected) |
273 | ts = client->trans; | |
8a0dc95f | 274 | |
5503ac56 EVH |
275 | if (!ts) |
276 | return -EREMOTEIO; | |
8a0dc95f | 277 | |
5503ac56 | 278 | if (!(ts->rd->f_flags & O_NONBLOCK)) |
5d385153 | 279 | p9_debug(P9_DEBUG_ERROR, "blocking read ...\n"); |
8a0dc95f | 280 | |
5503ac56 EVH |
281 | ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); |
282 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
283 | client->status = Disconnected; | |
284 | return ret; | |
8a0dc95f EVH |
285 | } |
286 | ||
287 | /** | |
5503ac56 EVH |
288 | * p9_read_work - called when there is some data to be read from a transport |
289 | * @work: container of work to be done | |
ee443996 | 290 | * |
8a0dc95f | 291 | */ |
ee443996 | 292 | |
5503ac56 | 293 | static void p9_read_work(struct work_struct *work) |
8a0dc95f | 294 | { |
5503ac56 EVH |
295 | int n, err; |
296 | struct p9_conn *m; | |
2b6e72ed | 297 | int status = REQ_STATUS_ERROR; |
5503ac56 EVH |
298 | |
299 | m = container_of(work, struct p9_conn, rq); | |
8a0dc95f EVH |
300 | |
301 | if (m->err < 0) | |
302 | return; | |
303 | ||
947867aa | 304 | p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset); |
8a0dc95f | 305 | |
947867aa DM |
306 | if (!m->rc.sdata) { |
307 | m->rc.sdata = m->tmp_buf; | |
308 | m->rc.offset = 0; | |
309 | m->rc.capacity = 7; /* start by reading header */ | |
8a0dc95f EVH |
310 | } |
311 | ||
5503ac56 | 312 | clear_bit(Rpending, &m->wsched); |
947867aa DM |
313 | p9_debug(P9_DEBUG_TRANS, "read mux %p pos %zd size: %zd = %zd\n", |
314 | m, m->rc.offset, m->rc.capacity, | |
315 | m->rc.capacity - m->rc.offset); | |
316 | err = p9_fd_read(m->client, m->rc.sdata + m->rc.offset, | |
317 | m->rc.capacity - m->rc.offset); | |
5d385153 | 318 | p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); |
947867aa | 319 | if (err == -EAGAIN) |
0462194d | 320 | goto end_clear; |
8a0dc95f | 321 | |
5503ac56 EVH |
322 | if (err <= 0) |
323 | goto error; | |
324 | ||
947867aa | 325 | m->rc.offset += err; |
1b0a763b | 326 | |
947867aa DM |
327 | /* header read in */ |
328 | if ((!m->req) && (m->rc.offset == m->rc.capacity)) { | |
5d385153 | 329 | p9_debug(P9_DEBUG_TRANS, "got new header\n"); |
1b0a763b | 330 | |
947867aa DM |
331 | err = p9_parse_header(&m->rc, NULL, NULL, NULL, 0); |
332 | if (err) { | |
333 | p9_debug(P9_DEBUG_ERROR, | |
334 | "error parsing header: %d\n", err); | |
335 | goto error; | |
336 | } | |
337 | ||
338 | if (m->rc.size >= m->client->msize) { | |
5d385153 | 339 | p9_debug(P9_DEBUG_ERROR, |
947867aa DM |
340 | "requested packet size too big: %d\n", |
341 | m->rc.size); | |
5503ac56 EVH |
342 | err = -EIO; |
343 | goto error; | |
344 | } | |
345 | ||
5d385153 | 346 | p9_debug(P9_DEBUG_TRANS, |
947867aa DM |
347 | "mux %p pkt: size: %d bytes tag: %d\n", |
348 | m, m->rc.size, m->rc.tag); | |
1b0a763b | 349 | |
947867aa | 350 | m->req = p9_tag_lookup(m->client, m->rc.tag); |
0bfd6845 | 351 | if (!m->req || (m->req->status != REQ_STATUS_SENT)) { |
5d385153 | 352 | p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", |
947867aa | 353 | m->rc.tag); |
1b0a763b EVH |
354 | err = -EIO; |
355 | goto error; | |
356 | } | |
357 | ||
358 | if (m->req->rc == NULL) { | |
3053600e DM |
359 | p9_debug(P9_DEBUG_ERROR, |
360 | "No recv fcall for tag %d (req %p), disconnecting!\n", | |
361 | m->rc.tag, m->req); | |
362 | m->req = NULL; | |
363 | err = -EIO; | |
364 | goto error; | |
1b0a763b | 365 | } |
947867aa DM |
366 | m->rc.sdata = (char *)m->req->rc + sizeof(struct p9_fcall); |
367 | memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity); | |
368 | m->rc.capacity = m->rc.size; | |
1b0a763b | 369 | } |
5503ac56 | 370 | |
947867aa DM |
371 | /* packet is read in |
372 | * not an else because some packets (like clunk) have no payload | |
373 | */ | |
374 | if ((m->req) && (m->rc.offset == m->rc.capacity)) { | |
5d385153 | 375 | p9_debug(P9_DEBUG_TRANS, "got new packet\n"); |
7eb923b8 | 376 | spin_lock(&m->client->lock); |
1bab88b2 | 377 | if (m->req->status != REQ_STATUS_ERROR) |
2b6e72ed | 378 | status = REQ_STATUS_RCVD; |
91b8534f | 379 | list_del(&m->req->req_list); |
7eb923b8 | 380 | spin_unlock(&m->client->lock); |
2b6e72ed | 381 | p9_client_cb(m->client, m->req, status); |
947867aa DM |
382 | m->rc.sdata = NULL; |
383 | m->rc.offset = 0; | |
384 | m->rc.capacity = 0; | |
1b0a763b | 385 | m->req = NULL; |
5503ac56 EVH |
386 | } |
387 | ||
0462194d SD |
388 | end_clear: |
389 | clear_bit(Rworksched, &m->wsched); | |
390 | ||
5503ac56 EVH |
391 | if (!list_empty(&m->req_list)) { |
392 | if (test_and_clear_bit(Rpending, &m->wsched)) | |
393 | n = POLLIN; | |
394 | else | |
395 | n = p9_fd_poll(m->client, NULL); | |
396 | ||
0462194d | 397 | if ((n & POLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) { |
5d385153 | 398 | p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); |
61edeeed | 399 | schedule_work(&m->rq); |
0462194d SD |
400 | } |
401 | } | |
5503ac56 EVH |
402 | |
403 | return; | |
5503ac56 EVH |
404 | error: |
405 | p9_conn_cancel(m, err); | |
406 | clear_bit(Rworksched, &m->wsched); | |
407 | } | |
408 | ||
409 | /** | |
410 | * p9_fd_write - write to a socket | |
411 | * @client: client instance | |
412 | * @v: buffer to send data from | |
413 | * @len: size of send buffer | |
ee443996 | 414 | * |
8a0dc95f | 415 | */ |
ee443996 | 416 | |
5503ac56 | 417 | static int p9_fd_write(struct p9_client *client, void *v, int len) |
8a0dc95f | 418 | { |
5503ac56 EVH |
419 | int ret; |
420 | mm_segment_t oldfs; | |
421 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 422 | |
5503ac56 EVH |
423 | if (client && client->status != Disconnected) |
424 | ts = client->trans; | |
8a0dc95f | 425 | |
5503ac56 EVH |
426 | if (!ts) |
427 | return -EREMOTEIO; | |
8a0dc95f | 428 | |
5503ac56 | 429 | if (!(ts->wr->f_flags & O_NONBLOCK)) |
5d385153 | 430 | p9_debug(P9_DEBUG_ERROR, "blocking write ...\n"); |
992b3f1d | 431 | |
5503ac56 EVH |
432 | oldfs = get_fs(); |
433 | set_fs(get_ds()); | |
434 | /* The cast to a user pointer is valid due to the set_fs() */ | |
e3db6cb4 | 435 | ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos); |
5503ac56 | 436 | set_fs(oldfs); |
992b3f1d | 437 | |
5503ac56 EVH |
438 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
439 | client->status = Disconnected; | |
440 | return ret; | |
8a0dc95f EVH |
441 | } |
442 | ||
443 | /** | |
444 | * p9_write_work - called when a transport can send some data | |
ee443996 EVH |
445 | * @work: container for work to be done |
446 | * | |
8a0dc95f | 447 | */ |
ee443996 | 448 | |
8a0dc95f EVH |
449 | static void p9_write_work(struct work_struct *work) |
450 | { | |
451 | int n, err; | |
452 | struct p9_conn *m; | |
673d62cd | 453 | struct p9_req_t *req; |
8a0dc95f EVH |
454 | |
455 | m = container_of(work, struct p9_conn, wq); | |
456 | ||
457 | if (m->err < 0) { | |
458 | clear_bit(Wworksched, &m->wsched); | |
459 | return; | |
460 | } | |
461 | ||
462 | if (!m->wsize) { | |
759f4298 | 463 | spin_lock(&m->client->lock); |
8a0dc95f EVH |
464 | if (list_empty(&m->unsent_req_list)) { |
465 | clear_bit(Wworksched, &m->wsched); | |
759f4298 | 466 | spin_unlock(&m->client->lock); |
8a0dc95f EVH |
467 | return; |
468 | } | |
469 | ||
673d62cd | 470 | req = list_entry(m->unsent_req_list.next, struct p9_req_t, |
8a0dc95f | 471 | req_list); |
673d62cd | 472 | req->status = REQ_STATUS_SENT; |
5d385153 | 473 | p9_debug(P9_DEBUG_TRANS, "move req %p\n", req); |
8a0dc95f | 474 | list_move_tail(&req->req_list, &m->req_list); |
8a0dc95f | 475 | |
673d62cd EVH |
476 | m->wbuf = req->tc->sdata; |
477 | m->wsize = req->tc->size; | |
8a0dc95f | 478 | m->wpos = 0; |
673d62cd | 479 | spin_unlock(&m->client->lock); |
8a0dc95f EVH |
480 | } |
481 | ||
5d385153 JP |
482 | p9_debug(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", |
483 | m, m->wpos, m->wsize); | |
8a0dc95f | 484 | clear_bit(Wpending, &m->wsched); |
8b81ef58 | 485 | err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); |
5d385153 | 486 | p9_debug(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err); |
584a8c13 SD |
487 | if (err == -EAGAIN) |
488 | goto end_clear; | |
489 | ||
8a0dc95f EVH |
490 | |
491 | if (err < 0) | |
492 | goto error; | |
493 | else if (err == 0) { | |
494 | err = -EREMOTEIO; | |
495 | goto error; | |
496 | } | |
497 | ||
498 | m->wpos += err; | |
499 | if (m->wpos == m->wsize) | |
500 | m->wpos = m->wsize = 0; | |
501 | ||
584a8c13 SD |
502 | end_clear: |
503 | clear_bit(Wworksched, &m->wsched); | |
504 | ||
1957b3a8 | 505 | if (m->wsize || !list_empty(&m->unsent_req_list)) { |
8a0dc95f EVH |
506 | if (test_and_clear_bit(Wpending, &m->wsched)) |
507 | n = POLLOUT; | |
508 | else | |
8b81ef58 | 509 | n = p9_fd_poll(m->client, NULL); |
8a0dc95f | 510 | |
584a8c13 SD |
511 | if ((n & POLLOUT) && |
512 | !test_and_set_bit(Wworksched, &m->wsched)) { | |
5d385153 | 513 | p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); |
61edeeed | 514 | schedule_work(&m->wq); |
584a8c13 SD |
515 | } |
516 | } | |
8a0dc95f EVH |
517 | |
518 | return; | |
519 | ||
520 | error: | |
521 | p9_conn_cancel(m, err); | |
522 | clear_bit(Wworksched, &m->wsched); | |
523 | } | |
524 | ||
95c96174 | 525 | static int p9_pollwake(wait_queue_t *wait, unsigned int mode, int sync, void *key) |
8a0dc95f | 526 | { |
5503ac56 EVH |
527 | struct p9_poll_wait *pwait = |
528 | container_of(wait, struct p9_poll_wait, wait); | |
529 | struct p9_conn *m = pwait->conn; | |
530 | unsigned long flags; | |
8a0dc95f | 531 | |
5503ac56 EVH |
532 | spin_lock_irqsave(&p9_poll_lock, flags); |
533 | if (list_empty(&m->poll_pending_link)) | |
534 | list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); | |
535 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
8a0dc95f | 536 | |
aa70c585 TH |
537 | schedule_work(&p9_poll_work); |
538 | return 1; | |
8a0dc95f EVH |
539 | } |
540 | ||
541 | /** | |
5503ac56 EVH |
542 | * p9_pollwait - add poll task to the wait queue |
543 | * @filp: file pointer being polled | |
544 | * @wait_address: wait_q to block on | |
545 | * @p: poll state | |
ee443996 | 546 | * |
5503ac56 | 547 | * called by files poll operation to add v9fs-poll task to files wait queue |
8a0dc95f | 548 | */ |
ee443996 | 549 | |
5503ac56 EVH |
550 | static void |
551 | p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) | |
8a0dc95f | 552 | { |
5503ac56 EVH |
553 | struct p9_conn *m = container_of(p, struct p9_conn, pt); |
554 | struct p9_poll_wait *pwait = NULL; | |
555 | int i; | |
8a0dc95f | 556 | |
5503ac56 EVH |
557 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
558 | if (m->poll_wait[i].wait_addr == NULL) { | |
559 | pwait = &m->poll_wait[i]; | |
560 | break; | |
8a0dc95f | 561 | } |
8a0dc95f EVH |
562 | } |
563 | ||
5503ac56 | 564 | if (!pwait) { |
5d385153 | 565 | p9_debug(P9_DEBUG_ERROR, "not enough wait_address slots\n"); |
8a0dc95f EVH |
566 | return; |
567 | } | |
568 | ||
5503ac56 EVH |
569 | pwait->conn = m; |
570 | pwait->wait_addr = wait_address; | |
571 | init_waitqueue_func_entry(&pwait->wait, p9_pollwake); | |
572 | add_wait_queue(wait_address, &pwait->wait); | |
573 | } | |
8a0dc95f | 574 | |
5503ac56 | 575 | /** |
263c5828 | 576 | * p9_conn_create - initialize the per-session mux data |
5503ac56 EVH |
577 | * @client: client instance |
578 | * | |
579 | * Note: Creates the polling task if this is the first session. | |
580 | */ | |
8a0dc95f | 581 | |
263c5828 | 582 | static void p9_conn_create(struct p9_client *client) |
5503ac56 | 583 | { |
95820a36 | 584 | int n; |
263c5828 SD |
585 | struct p9_trans_fd *ts = client->trans; |
586 | struct p9_conn *m = &ts->conn; | |
8a0dc95f | 587 | |
5d385153 | 588 | p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize); |
8a0dc95f | 589 | |
5503ac56 EVH |
590 | INIT_LIST_HEAD(&m->mux_list); |
591 | m->client = client; | |
8a0dc95f | 592 | |
5503ac56 EVH |
593 | INIT_LIST_HEAD(&m->req_list); |
594 | INIT_LIST_HEAD(&m->unsent_req_list); | |
595 | INIT_WORK(&m->rq, p9_read_work); | |
596 | INIT_WORK(&m->wq, p9_write_work); | |
597 | INIT_LIST_HEAD(&m->poll_pending_link); | |
598 | init_poll_funcptr(&m->pt, p9_pollwait); | |
8a0dc95f | 599 | |
5503ac56 EVH |
600 | n = p9_fd_poll(client, &m->pt); |
601 | if (n & POLLIN) { | |
5d385153 | 602 | p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); |
5503ac56 EVH |
603 | set_bit(Rpending, &m->wsched); |
604 | } | |
8a0dc95f | 605 | |
5503ac56 | 606 | if (n & POLLOUT) { |
5d385153 | 607 | p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); |
5503ac56 EVH |
608 | set_bit(Wpending, &m->wsched); |
609 | } | |
5503ac56 | 610 | } |
8a0dc95f | 611 | |
5503ac56 EVH |
612 | /** |
613 | * p9_poll_mux - polls a mux and schedules read or write works if necessary | |
614 | * @m: connection to poll | |
615 | * | |
616 | */ | |
617 | ||
618 | static void p9_poll_mux(struct p9_conn *m) | |
619 | { | |
620 | int n; | |
621 | ||
622 | if (m->err < 0) | |
623 | return; | |
624 | ||
625 | n = p9_fd_poll(m->client, NULL); | |
626 | if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { | |
5d385153 | 627 | p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n); |
5503ac56 EVH |
628 | if (n >= 0) |
629 | n = -ECONNRESET; | |
630 | p9_conn_cancel(m, n); | |
631 | } | |
632 | ||
633 | if (n & POLLIN) { | |
634 | set_bit(Rpending, &m->wsched); | |
5d385153 | 635 | p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); |
5503ac56 | 636 | if (!test_and_set_bit(Rworksched, &m->wsched)) { |
5d385153 | 637 | p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); |
61edeeed | 638 | schedule_work(&m->rq); |
5503ac56 EVH |
639 | } |
640 | } | |
8a0dc95f | 641 | |
5503ac56 EVH |
642 | if (n & POLLOUT) { |
643 | set_bit(Wpending, &m->wsched); | |
5d385153 | 644 | p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); |
f64f9e71 JP |
645 | if ((m->wsize || !list_empty(&m->unsent_req_list)) && |
646 | !test_and_set_bit(Wworksched, &m->wsched)) { | |
5d385153 | 647 | p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); |
61edeeed | 648 | schedule_work(&m->wq); |
5503ac56 EVH |
649 | } |
650 | } | |
8a0dc95f EVH |
651 | } |
652 | ||
653 | /** | |
91b8534f | 654 | * p9_fd_request - send 9P request |
8a0dc95f EVH |
655 | * The function can sleep until the request is scheduled for sending. |
656 | * The function can be interrupted. Return from the function is not | |
91b8534f | 657 | * a guarantee that the request is sent successfully. |
8a0dc95f | 658 | * |
91b8534f EVH |
659 | * @client: client instance |
660 | * @req: request to be sent | |
ee443996 | 661 | * |
8a0dc95f | 662 | */ |
ee443996 | 663 | |
91b8534f | 664 | static int p9_fd_request(struct p9_client *client, struct p9_req_t *req) |
8a0dc95f EVH |
665 | { |
666 | int n; | |
91b8534f | 667 | struct p9_trans_fd *ts = client->trans; |
263c5828 | 668 | struct p9_conn *m = &ts->conn; |
8a0dc95f | 669 | |
5d385153 JP |
670 | p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", |
671 | m, current, req->tc, req->tc->id); | |
8a0dc95f | 672 | if (m->err < 0) |
91b8534f | 673 | return m->err; |
8a0dc95f | 674 | |
91b8534f | 675 | spin_lock(&client->lock); |
7eb923b8 | 676 | req->status = REQ_STATUS_UNSENT; |
8a0dc95f | 677 | list_add_tail(&req->req_list, &m->unsent_req_list); |
91b8534f | 678 | spin_unlock(&client->lock); |
8a0dc95f EVH |
679 | |
680 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
681 | n = POLLOUT; | |
682 | else | |
8b81ef58 | 683 | n = p9_fd_poll(m->client, NULL); |
8a0dc95f EVH |
684 | |
685 | if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) | |
61edeeed | 686 | schedule_work(&m->wq); |
8a0dc95f | 687 | |
91b8534f | 688 | return 0; |
8a0dc95f EVH |
689 | } |
690 | ||
91b8534f | 691 | static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req) |
8a0dc95f | 692 | { |
7eb923b8 | 693 | int ret = 1; |
8a0dc95f | 694 | |
5d385153 | 695 | p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); |
8a0dc95f | 696 | |
91b8534f | 697 | spin_lock(&client->lock); |
91b8534f | 698 | |
91b8534f | 699 | if (req->status == REQ_STATUS_UNSENT) { |
1bab88b2 | 700 | list_del(&req->req_list); |
91b8534f | 701 | req->status = REQ_STATUS_FLSHD; |
7eb923b8 | 702 | ret = 0; |
0bfd6845 | 703 | } |
7eb923b8 EVH |
704 | spin_unlock(&client->lock); |
705 | ||
706 | return ret; | |
8a0dc95f EVH |
707 | } |
708 | ||
afd8d654 SD |
709 | static int p9_fd_cancelled(struct p9_client *client, struct p9_req_t *req) |
710 | { | |
711 | p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); | |
712 | ||
713 | /* we haven't received a response for oldreq, | |
714 | * remove it from the list. | |
715 | */ | |
716 | spin_lock(&client->lock); | |
717 | list_del(&req->req_list); | |
718 | spin_unlock(&client->lock); | |
719 | ||
720 | return 0; | |
721 | } | |
722 | ||
a80d923e | 723 | /** |
0e15597e AK |
724 | * parse_opts - parse mount options into p9_fd_opts structure |
725 | * @params: options string passed from mount | |
726 | * @opts: fd transport-specific structure to parse options into | |
a80d923e | 727 | * |
bb8ffdfc | 728 | * Returns 0 upon success, -ERRNO upon failure |
a80d923e | 729 | */ |
bd238fb4 | 730 | |
bb8ffdfc | 731 | static int parse_opts(char *params, struct p9_fd_opts *opts) |
bd238fb4 | 732 | { |
a80d923e EVH |
733 | char *p; |
734 | substring_t args[MAX_OPT_ARGS]; | |
735 | int option; | |
d8c8a9e3 | 736 | char *options, *tmp_options; |
bd238fb4 | 737 | |
a80d923e EVH |
738 | opts->port = P9_PORT; |
739 | opts->rfd = ~0; | |
740 | opts->wfd = ~0; | |
b99baa43 | 741 | opts->privport = 0; |
bd238fb4 | 742 | |
bb8ffdfc EVH |
743 | if (!params) |
744 | return 0; | |
745 | ||
d8c8a9e3 EVH |
746 | tmp_options = kstrdup(params, GFP_KERNEL); |
747 | if (!tmp_options) { | |
5d385153 JP |
748 | p9_debug(P9_DEBUG_ERROR, |
749 | "failed to allocate copy of option string\n"); | |
bb8ffdfc EVH |
750 | return -ENOMEM; |
751 | } | |
d8c8a9e3 | 752 | options = tmp_options; |
bd238fb4 | 753 | |
a80d923e EVH |
754 | while ((p = strsep(&options, ",")) != NULL) { |
755 | int token; | |
bb8ffdfc | 756 | int r; |
a80d923e EVH |
757 | if (!*p) |
758 | continue; | |
759 | token = match_token(p, tokens, args); | |
2f28c8b3 | 760 | if ((token != Opt_err) && (token != Opt_privport)) { |
15da4b16 AK |
761 | r = match_int(&args[0], &option); |
762 | if (r < 0) { | |
5d385153 JP |
763 | p9_debug(P9_DEBUG_ERROR, |
764 | "integer field, but no integer?\n"); | |
15da4b16 AK |
765 | continue; |
766 | } | |
a80d923e EVH |
767 | } |
768 | switch (token) { | |
769 | case Opt_port: | |
770 | opts->port = option; | |
771 | break; | |
772 | case Opt_rfdno: | |
773 | opts->rfd = option; | |
774 | break; | |
775 | case Opt_wfdno: | |
776 | opts->wfd = option; | |
777 | break; | |
2f28c8b3 JG |
778 | case Opt_privport: |
779 | opts->privport = 1; | |
780 | break; | |
a80d923e EVH |
781 | default: |
782 | continue; | |
783 | } | |
bd238fb4 | 784 | } |
d8c8a9e3 EVH |
785 | |
786 | kfree(tmp_options); | |
bb8ffdfc | 787 | return 0; |
bd238fb4 | 788 | } |
bd238fb4 | 789 | |
8b81ef58 | 790 | static int p9_fd_open(struct p9_client *client, int rfd, int wfd) |
bd238fb4 | 791 | { |
263c5828 | 792 | struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd), |
a80d923e EVH |
793 | GFP_KERNEL); |
794 | if (!ts) | |
795 | return -ENOMEM; | |
bd238fb4 | 796 | |
a80d923e EVH |
797 | ts->rd = fget(rfd); |
798 | ts->wr = fget(wfd); | |
799 | if (!ts->rd || !ts->wr) { | |
800 | if (ts->rd) | |
801 | fput(ts->rd); | |
802 | if (ts->wr) | |
803 | fput(ts->wr); | |
804 | kfree(ts); | |
805 | return -EIO; | |
bd238fb4 LI |
806 | } |
807 | ||
8b81ef58 EVH |
808 | client->trans = ts; |
809 | client->status = Connected; | |
bd238fb4 | 810 | |
a80d923e | 811 | return 0; |
bd238fb4 | 812 | } |
bd238fb4 | 813 | |
8b81ef58 | 814 | static int p9_socket_open(struct p9_client *client, struct socket *csocket) |
bd238fb4 | 815 | { |
6b18662e | 816 | struct p9_trans_fd *p; |
56b31d1c | 817 | struct file *file; |
6b18662e | 818 | |
263c5828 | 819 | p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL); |
6b18662e AV |
820 | if (!p) |
821 | return -ENOMEM; | |
bd238fb4 LI |
822 | |
823 | csocket->sk->sk_allocation = GFP_NOIO; | |
aab174f0 | 824 | file = sock_alloc_file(csocket, 0, NULL); |
56b31d1c | 825 | if (IS_ERR(file)) { |
5d385153 JP |
826 | pr_err("%s (%d): failed to map fd\n", |
827 | __func__, task_pid_nr(current)); | |
6b18662e AV |
828 | sock_release(csocket); |
829 | kfree(p); | |
56b31d1c | 830 | return PTR_ERR(file); |
bd238fb4 LI |
831 | } |
832 | ||
56b31d1c AV |
833 | get_file(file); |
834 | p->wr = p->rd = file; | |
6b18662e AV |
835 | client->trans = p; |
836 | client->status = Connected; | |
837 | ||
6b18662e AV |
838 | p->rd->f_flags |= O_NONBLOCK; |
839 | ||
263c5828 | 840 | p9_conn_create(client); |
bd238fb4 LI |
841 | return 0; |
842 | } | |
843 | ||
bd238fb4 | 844 | /** |
263c5828 | 845 | * p9_mux_destroy - cancels all pending requests of mux |
5503ac56 | 846 | * @m: mux to destroy |
bd238fb4 LI |
847 | * |
848 | */ | |
ee443996 | 849 | |
5503ac56 | 850 | static void p9_conn_destroy(struct p9_conn *m) |
bd238fb4 | 851 | { |
5d385153 JP |
852 | p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", |
853 | m, m->mux_list.prev, m->mux_list.next); | |
bd238fb4 | 854 | |
5503ac56 EVH |
855 | p9_mux_poll_stop(m); |
856 | cancel_work_sync(&m->rq); | |
857 | cancel_work_sync(&m->wq); | |
bd238fb4 | 858 | |
5503ac56 | 859 | p9_conn_cancel(m, -ECONNRESET); |
bd238fb4 | 860 | |
5503ac56 | 861 | m->client = NULL; |
bd238fb4 LI |
862 | } |
863 | ||
864 | /** | |
8b81ef58 EVH |
865 | * p9_fd_close - shutdown file descriptor transport |
866 | * @client: client instance | |
bd238fb4 LI |
867 | * |
868 | */ | |
ee443996 | 869 | |
8b81ef58 | 870 | static void p9_fd_close(struct p9_client *client) |
bd238fb4 LI |
871 | { |
872 | struct p9_trans_fd *ts; | |
873 | ||
8b81ef58 | 874 | if (!client) |
bd238fb4 LI |
875 | return; |
876 | ||
8b81ef58 | 877 | ts = client->trans; |
bd238fb4 LI |
878 | if (!ts) |
879 | return; | |
880 | ||
8b81ef58 EVH |
881 | client->status = Disconnected; |
882 | ||
263c5828 | 883 | p9_conn_destroy(&ts->conn); |
8a0dc95f | 884 | |
bd238fb4 LI |
885 | if (ts->rd) |
886 | fput(ts->rd); | |
887 | if (ts->wr) | |
888 | fput(ts->wr); | |
8b81ef58 | 889 | |
bd238fb4 LI |
890 | kfree(ts); |
891 | } | |
892 | ||
887b3ece EVH |
893 | /* |
894 | * stolen from NFS - maybe should be made a generic function? | |
895 | */ | |
896 | static inline int valid_ipaddr4(const char *buf) | |
897 | { | |
898 | int rc, count, in[4]; | |
899 | ||
900 | rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); | |
901 | if (rc != 4) | |
902 | return -EINVAL; | |
903 | for (count = 0; count < 4; count++) { | |
904 | if (in[count] > 255) | |
905 | return -EINVAL; | |
906 | } | |
907 | return 0; | |
908 | } | |
909 | ||
2f28c8b3 JG |
910 | static int p9_bind_privport(struct socket *sock) |
911 | { | |
912 | struct sockaddr_in cl; | |
913 | int port, err = -EINVAL; | |
914 | ||
915 | memset(&cl, 0, sizeof(cl)); | |
916 | cl.sin_family = AF_INET; | |
917 | cl.sin_addr.s_addr = INADDR_ANY; | |
918 | for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) { | |
919 | cl.sin_port = htons((ushort)port); | |
920 | err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl)); | |
921 | if (err != -EADDRINUSE) | |
922 | break; | |
923 | } | |
924 | return err; | |
925 | } | |
926 | ||
927 | ||
8b81ef58 EVH |
928 | static int |
929 | p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
930 | { |
931 | int err; | |
a80d923e EVH |
932 | struct socket *csocket; |
933 | struct sockaddr_in sin_server; | |
934 | struct p9_fd_opts opts; | |
935 | ||
bb8ffdfc EVH |
936 | err = parse_opts(args, &opts); |
937 | if (err < 0) | |
8b81ef58 | 938 | return err; |
a80d923e | 939 | |
887b3ece | 940 | if (valid_ipaddr4(addr) < 0) |
8b81ef58 | 941 | return -EINVAL; |
887b3ece | 942 | |
a80d923e | 943 | csocket = NULL; |
a80d923e EVH |
944 | |
945 | sin_server.sin_family = AF_INET; | |
946 | sin_server.sin_addr.s_addr = in_aton(addr); | |
947 | sin_server.sin_port = htons(opts.port); | |
0c5c9fb5 | 948 | err = __sock_create(current->nsproxy->net_ns, PF_INET, |
e75762fd | 949 | SOCK_STREAM, IPPROTO_TCP, &csocket, 1); |
6b18662e | 950 | if (err) { |
5d385153 JP |
951 | pr_err("%s (%d): problem creating socket\n", |
952 | __func__, task_pid_nr(current)); | |
6b18662e | 953 | return err; |
a80d923e EVH |
954 | } |
955 | ||
2f28c8b3 JG |
956 | if (opts.privport) { |
957 | err = p9_bind_privport(csocket); | |
958 | if (err < 0) { | |
959 | pr_err("%s (%d): problem binding to privport\n", | |
960 | __func__, task_pid_nr(current)); | |
961 | sock_release(csocket); | |
962 | return err; | |
963 | } | |
964 | } | |
965 | ||
a80d923e EVH |
966 | err = csocket->ops->connect(csocket, |
967 | (struct sockaddr *)&sin_server, | |
968 | sizeof(struct sockaddr_in), 0); | |
969 | if (err < 0) { | |
5d385153 JP |
970 | pr_err("%s (%d): problem connecting socket to %s\n", |
971 | __func__, task_pid_nr(current), addr); | |
a80d923e | 972 | sock_release(csocket); |
6b18662e AV |
973 | return err; |
974 | } | |
a80d923e | 975 | |
6b18662e | 976 | return p9_socket_open(client, csocket); |
a80d923e EVH |
977 | } |
978 | ||
8b81ef58 EVH |
979 | static int |
980 | p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
981 | { |
982 | int err; | |
983 | struct socket *csocket; | |
984 | struct sockaddr_un sun_server; | |
a80d923e EVH |
985 | |
986 | csocket = NULL; | |
a80d923e | 987 | |
cff6b8a9 | 988 | if (strlen(addr) >= UNIX_PATH_MAX) { |
5d385153 JP |
989 | pr_err("%s (%d): address too long: %s\n", |
990 | __func__, task_pid_nr(current), addr); | |
6b18662e | 991 | return -ENAMETOOLONG; |
a80d923e EVH |
992 | } |
993 | ||
994 | sun_server.sun_family = PF_UNIX; | |
995 | strcpy(sun_server.sun_path, addr); | |
0c5c9fb5 | 996 | err = __sock_create(current->nsproxy->net_ns, PF_UNIX, |
e75762fd | 997 | SOCK_STREAM, 0, &csocket, 1); |
6b18662e | 998 | if (err < 0) { |
5d385153 JP |
999 | pr_err("%s (%d): problem creating socket\n", |
1000 | __func__, task_pid_nr(current)); | |
1001 | ||
6b18662e AV |
1002 | return err; |
1003 | } | |
a80d923e EVH |
1004 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, |
1005 | sizeof(struct sockaddr_un) - 1, 0); | |
1006 | if (err < 0) { | |
5d385153 JP |
1007 | pr_err("%s (%d): problem connecting socket: %s: %d\n", |
1008 | __func__, task_pid_nr(current), addr, err); | |
a80d923e | 1009 | sock_release(csocket); |
6b18662e AV |
1010 | return err; |
1011 | } | |
a80d923e | 1012 | |
6b18662e | 1013 | return p9_socket_open(client, csocket); |
a80d923e EVH |
1014 | } |
1015 | ||
8b81ef58 EVH |
1016 | static int |
1017 | p9_fd_create(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
1018 | { |
1019 | int err; | |
a80d923e EVH |
1020 | struct p9_fd_opts opts; |
1021 | ||
1022 | parse_opts(args, &opts); | |
1023 | ||
1024 | if (opts.rfd == ~0 || opts.wfd == ~0) { | |
5d385153 | 1025 | pr_err("Insufficient options for proto=fd\n"); |
8b81ef58 | 1026 | return -ENOPROTOOPT; |
a80d923e EVH |
1027 | } |
1028 | ||
8b81ef58 | 1029 | err = p9_fd_open(client, opts.rfd, opts.wfd); |
a80d923e | 1030 | if (err < 0) |
6b18662e | 1031 | return err; |
a80d923e | 1032 | |
263c5828 | 1033 | p9_conn_create(client); |
8a0dc95f | 1034 | |
8b81ef58 | 1035 | return 0; |
a80d923e EVH |
1036 | } |
1037 | ||
1038 | static struct p9_trans_module p9_tcp_trans = { | |
1039 | .name = "tcp", | |
1040 | .maxsize = MAX_SOCK_BUF, | |
f94741fd | 1041 | .def = 0, |
8b81ef58 EVH |
1042 | .create = p9_fd_create_tcp, |
1043 | .close = p9_fd_close, | |
91b8534f EVH |
1044 | .request = p9_fd_request, |
1045 | .cancel = p9_fd_cancel, | |
afd8d654 | 1046 | .cancelled = p9_fd_cancelled, |
72029fe8 | 1047 | .owner = THIS_MODULE, |
a80d923e EVH |
1048 | }; |
1049 | ||
1050 | static struct p9_trans_module p9_unix_trans = { | |
1051 | .name = "unix", | |
1052 | .maxsize = MAX_SOCK_BUF, | |
1053 | .def = 0, | |
8b81ef58 EVH |
1054 | .create = p9_fd_create_unix, |
1055 | .close = p9_fd_close, | |
91b8534f EVH |
1056 | .request = p9_fd_request, |
1057 | .cancel = p9_fd_cancel, | |
afd8d654 | 1058 | .cancelled = p9_fd_cancelled, |
72029fe8 | 1059 | .owner = THIS_MODULE, |
a80d923e EVH |
1060 | }; |
1061 | ||
1062 | static struct p9_trans_module p9_fd_trans = { | |
1063 | .name = "fd", | |
1064 | .maxsize = MAX_SOCK_BUF, | |
1065 | .def = 0, | |
8b81ef58 EVH |
1066 | .create = p9_fd_create, |
1067 | .close = p9_fd_close, | |
91b8534f EVH |
1068 | .request = p9_fd_request, |
1069 | .cancel = p9_fd_cancel, | |
afd8d654 | 1070 | .cancelled = p9_fd_cancelled, |
72029fe8 | 1071 | .owner = THIS_MODULE, |
a80d923e EVH |
1072 | }; |
1073 | ||
5503ac56 EVH |
1074 | /** |
1075 | * p9_poll_proc - poll worker thread | |
1076 | * @a: thread state and arguments | |
1077 | * | |
1078 | * polls all v9fs transports for new events and queues the appropriate | |
1079 | * work to the work queue | |
1080 | * | |
1081 | */ | |
1082 | ||
aa70c585 | 1083 | static void p9_poll_workfn(struct work_struct *work) |
5503ac56 EVH |
1084 | { |
1085 | unsigned long flags; | |
1086 | ||
5d385153 | 1087 | p9_debug(P9_DEBUG_TRANS, "start %p\n", current); |
aa70c585 | 1088 | |
5503ac56 EVH |
1089 | spin_lock_irqsave(&p9_poll_lock, flags); |
1090 | while (!list_empty(&p9_poll_pending_list)) { | |
1091 | struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, | |
1092 | struct p9_conn, | |
1093 | poll_pending_link); | |
1094 | list_del_init(&conn->poll_pending_link); | |
1095 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1096 | ||
1097 | p9_poll_mux(conn); | |
1098 | ||
1099 | spin_lock_irqsave(&p9_poll_lock, flags); | |
1100 | } | |
1101 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1102 | ||
5d385153 | 1103 | p9_debug(P9_DEBUG_TRANS, "finish\n"); |
5503ac56 EVH |
1104 | } |
1105 | ||
887b3ece | 1106 | int p9_trans_fd_init(void) |
a80d923e EVH |
1107 | { |
1108 | v9fs_register_trans(&p9_tcp_trans); | |
1109 | v9fs_register_trans(&p9_unix_trans); | |
1110 | v9fs_register_trans(&p9_fd_trans); | |
1111 | ||
3387b804 | 1112 | return 0; |
a80d923e | 1113 | } |
72029fe8 TH |
1114 | |
1115 | void p9_trans_fd_exit(void) | |
1116 | { | |
43829731 | 1117 | flush_work(&p9_poll_work); |
72029fe8 TH |
1118 | v9fs_unregister_trans(&p9_tcp_trans); |
1119 | v9fs_unregister_trans(&p9_unix_trans); | |
1120 | v9fs_unregister_trans(&p9_fd_trans); | |
1121 | } |