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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> |
c4fac910 | 44 | #include <linux/seq_file.h> |
bd238fb4 | 45 | #include <net/9p/9p.h> |
8b81ef58 | 46 | #include <net/9p/client.h> |
bd238fb4 LI |
47 | #include <net/9p/transport.h> |
48 | ||
6b18662e AV |
49 | #include <linux/syscalls.h> /* killme */ |
50 | ||
bd238fb4 | 51 | #define P9_PORT 564 |
a80d923e | 52 | #define MAX_SOCK_BUF (64*1024) |
8a0dc95f | 53 | #define MAXPOLLWADDR 2 |
a80d923e | 54 | |
c4fac910 DH |
55 | static struct p9_trans_module p9_tcp_trans; |
56 | static struct p9_trans_module p9_fd_trans; | |
57 | ||
ee443996 EVH |
58 | /** |
59 | * struct p9_fd_opts - per-transport options | |
60 | * @rfd: file descriptor for reading (trans=fd) | |
61 | * @wfd: file descriptor for writing (trans=fd) | |
62 | * @port: port to connect to (trans=tcp) | |
63 | * | |
64 | */ | |
65 | ||
a80d923e EVH |
66 | struct p9_fd_opts { |
67 | int rfd; | |
68 | int wfd; | |
69 | u16 port; | |
c4fac910 | 70 | bool privport; |
a80d923e | 71 | }; |
bd238fb4 | 72 | |
a80d923e EVH |
73 | /* |
74 | * Option Parsing (code inspired by NFS code) | |
75 | * - a little lazy - parse all fd-transport options | |
76 | */ | |
bd238fb4 | 77 | |
a80d923e EVH |
78 | enum { |
79 | /* Options that take integer arguments */ | |
55762690 | 80 | Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
2f28c8b3 JG |
81 | /* Options that take no arguments */ |
82 | Opt_privport, | |
a80d923e | 83 | }; |
bd238fb4 | 84 | |
a447c093 | 85 | static const match_table_t tokens = { |
a80d923e EVH |
86 | {Opt_port, "port=%u"}, |
87 | {Opt_rfdno, "rfdno=%u"}, | |
88 | {Opt_wfdno, "wfdno=%u"}, | |
2f28c8b3 | 89 | {Opt_privport, "privport"}, |
55762690 | 90 | {Opt_err, NULL}, |
a80d923e | 91 | }; |
bd238fb4 | 92 | |
8a0dc95f EVH |
93 | enum { |
94 | Rworksched = 1, /* read work scheduled or running */ | |
95 | Rpending = 2, /* can read */ | |
96 | Wworksched = 4, /* write work scheduled or running */ | |
97 | Wpending = 8, /* can write */ | |
98 | }; | |
99 | ||
992b3f1d TH |
100 | struct p9_poll_wait { |
101 | struct p9_conn *conn; | |
ac6424b9 | 102 | wait_queue_entry_t wait; |
992b3f1d | 103 | wait_queue_head_t *wait_addr; |
ee443996 EVH |
104 | }; |
105 | ||
106 | /** | |
107 | * struct p9_conn - fd mux connection state information | |
ee443996 | 108 | * @mux_list: list link for mux to manage multiple connections (?) |
8b81ef58 | 109 | * @client: reference to client instance for this connection |
ee443996 | 110 | * @err: error state |
ee443996 EVH |
111 | * @req_list: accounting for requests which have been sent |
112 | * @unsent_req_list: accounting for requests that haven't been sent | |
1b0a763b EVH |
113 | * @req: current request being processed (if any) |
114 | * @tmp_buf: temporary buffer to read in header | |
947867aa | 115 | * @rc: temporary fcall for reading current frame |
ee443996 EVH |
116 | * @wpos: write position for current frame |
117 | * @wsize: amount of data to write for current frame | |
118 | * @wbuf: current write buffer | |
0e15597e | 119 | * @poll_pending_link: pending links to be polled per conn |
ee443996 | 120 | * @poll_wait: array of wait_q's for various worker threads |
ee443996 EVH |
121 | * @pt: poll state |
122 | * @rq: current read work | |
123 | * @wq: current write work | |
124 | * @wsched: ???? | |
125 | * | |
126 | */ | |
8a0dc95f EVH |
127 | |
128 | struct p9_conn { | |
8a0dc95f | 129 | struct list_head mux_list; |
8b81ef58 | 130 | struct p9_client *client; |
8a0dc95f | 131 | int err; |
8a0dc95f EVH |
132 | struct list_head req_list; |
133 | struct list_head unsent_req_list; | |
1b0a763b EVH |
134 | struct p9_req_t *req; |
135 | char tmp_buf[7]; | |
947867aa | 136 | struct p9_fcall rc; |
8a0dc95f EVH |
137 | int wpos; |
138 | int wsize; | |
139 | char *wbuf; | |
992b3f1d TH |
140 | struct list_head poll_pending_link; |
141 | struct p9_poll_wait poll_wait[MAXPOLLWADDR]; | |
8a0dc95f EVH |
142 | poll_table pt; |
143 | struct work_struct rq; | |
144 | struct work_struct wq; | |
145 | unsigned long wsched; | |
146 | }; | |
147 | ||
263c5828 SD |
148 | /** |
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 | ||
156 | struct p9_trans_fd { | |
157 | struct file *rd; | |
158 | struct file *wr; | |
159 | struct p9_conn conn; | |
160 | }; | |
161 | ||
aa70c585 TH |
162 | static void p9_poll_workfn(struct work_struct *work); |
163 | ||
992b3f1d TH |
164 | static DEFINE_SPINLOCK(p9_poll_lock); |
165 | static LIST_HEAD(p9_poll_pending_list); | |
aa70c585 | 166 | static DECLARE_WORK(p9_poll_work, p9_poll_workfn); |
8a0dc95f | 167 | |
2f28c8b3 JG |
168 | static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT; |
169 | static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT; | |
170 | ||
992b3f1d | 171 | static void p9_mux_poll_stop(struct p9_conn *m) |
8a0dc95f | 172 | { |
992b3f1d TH |
173 | unsigned long flags; |
174 | int i; | |
8a0dc95f | 175 | |
992b3f1d TH |
176 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
177 | struct p9_poll_wait *pwait = &m->poll_wait[i]; | |
8a0dc95f | 178 | |
992b3f1d TH |
179 | if (pwait->wait_addr) { |
180 | remove_wait_queue(pwait->wait_addr, &pwait->wait); | |
181 | pwait->wait_addr = NULL; | |
8a0dc95f | 182 | } |
8a0dc95f EVH |
183 | } |
184 | ||
992b3f1d TH |
185 | spin_lock_irqsave(&p9_poll_lock, flags); |
186 | list_del_init(&m->poll_pending_link); | |
187 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
8a0dc95f EVH |
188 | } |
189 | ||
190 | /** | |
5503ac56 EVH |
191 | * p9_conn_cancel - cancel all pending requests with error |
192 | * @m: mux data | |
193 | * @err: error code | |
8a0dc95f | 194 | * |
8a0dc95f | 195 | */ |
ee443996 | 196 | |
51a87c55 | 197 | static void p9_conn_cancel(struct p9_conn *m, int err) |
8a0dc95f | 198 | { |
673d62cd | 199 | struct p9_req_t *req, *rtmp; |
91b8534f | 200 | unsigned long flags; |
5503ac56 | 201 | LIST_HEAD(cancel_list); |
8a0dc95f | 202 | |
5d385153 | 203 | p9_debug(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); |
7eb923b8 | 204 | |
91b8534f | 205 | spin_lock_irqsave(&m->client->lock, flags); |
7eb923b8 EVH |
206 | |
207 | if (m->err) { | |
208 | spin_unlock_irqrestore(&m->client->lock, flags); | |
209 | return; | |
210 | } | |
211 | ||
212 | m->err = err; | |
213 | ||
5503ac56 EVH |
214 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { |
215 | list_move(&req->req_list, &cancel_list); | |
216 | } | |
217 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { | |
218 | list_move(&req->req_list, &cancel_list); | |
8a0dc95f | 219 | } |
91b8534f | 220 | spin_unlock_irqrestore(&m->client->lock, flags); |
8a0dc95f | 221 | |
5503ac56 | 222 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { |
5d385153 | 223 | p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req); |
1bab88b2 | 224 | list_del(&req->req_list); |
2b6e72ed DM |
225 | if (!req->t_err) |
226 | req->t_err = err; | |
227 | p9_client_cb(m->client, req, REQ_STATUS_ERROR); | |
8a0dc95f | 228 | } |
8a0dc95f EVH |
229 | } |
230 | ||
29af9309 | 231 | static int |
5503ac56 | 232 | p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt) |
8a0dc95f | 233 | { |
5503ac56 EVH |
234 | int ret, n; |
235 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 236 | |
5503ac56 EVH |
237 | if (client && client->status == Connected) |
238 | ts = client->trans; | |
7dc5d24b | 239 | |
5503ac56 EVH |
240 | if (!ts) |
241 | return -EREMOTEIO; | |
7dc5d24b | 242 | |
72c2d531 | 243 | if (!ts->rd->f_op->poll) |
5503ac56 | 244 | return -EIO; |
8a0dc95f | 245 | |
72c2d531 | 246 | if (!ts->wr->f_op->poll) |
5503ac56 | 247 | return -EIO; |
992b3f1d | 248 | |
5503ac56 EVH |
249 | ret = ts->rd->f_op->poll(ts->rd, pt); |
250 | if (ret < 0) | |
251 | return ret; | |
992b3f1d | 252 | |
5503ac56 EVH |
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; | |
992b3f1d TH |
261 | } |
262 | ||
8a0dc95f | 263 | /** |
5503ac56 EVH |
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 | |
ee443996 | 268 | * |
8a0dc95f | 269 | */ |
ee443996 | 270 | |
5503ac56 | 271 | static int p9_fd_read(struct p9_client *client, void *v, int len) |
8a0dc95f | 272 | { |
5503ac56 EVH |
273 | int ret; |
274 | struct p9_trans_fd *ts = NULL; | |
bdd1d2d3 | 275 | loff_t pos; |
8a0dc95f | 276 | |
5503ac56 EVH |
277 | if (client && client->status != Disconnected) |
278 | ts = client->trans; | |
8a0dc95f | 279 | |
5503ac56 EVH |
280 | if (!ts) |
281 | return -EREMOTEIO; | |
8a0dc95f | 282 | |
5503ac56 | 283 | if (!(ts->rd->f_flags & O_NONBLOCK)) |
5d385153 | 284 | p9_debug(P9_DEBUG_ERROR, "blocking read ...\n"); |
8a0dc95f | 285 | |
bdd1d2d3 CH |
286 | pos = ts->rd->f_pos; |
287 | ret = kernel_read(ts->rd, v, len, &pos); | |
5503ac56 EVH |
288 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
289 | client->status = Disconnected; | |
290 | return ret; | |
8a0dc95f EVH |
291 | } |
292 | ||
293 | /** | |
5503ac56 EVH |
294 | * p9_read_work - called when there is some data to be read from a transport |
295 | * @work: container of work to be done | |
ee443996 | 296 | * |
8a0dc95f | 297 | */ |
ee443996 | 298 | |
5503ac56 | 299 | static void p9_read_work(struct work_struct *work) |
8a0dc95f | 300 | { |
5503ac56 EVH |
301 | int n, err; |
302 | struct p9_conn *m; | |
2b6e72ed | 303 | int status = REQ_STATUS_ERROR; |
5503ac56 EVH |
304 | |
305 | m = container_of(work, struct p9_conn, rq); | |
8a0dc95f EVH |
306 | |
307 | if (m->err < 0) | |
308 | return; | |
309 | ||
947867aa | 310 | p9_debug(P9_DEBUG_TRANS, "start mux %p pos %zd\n", m, m->rc.offset); |
8a0dc95f | 311 | |
947867aa DM |
312 | if (!m->rc.sdata) { |
313 | m->rc.sdata = m->tmp_buf; | |
314 | m->rc.offset = 0; | |
315 | m->rc.capacity = 7; /* start by reading header */ | |
8a0dc95f EVH |
316 | } |
317 | ||
5503ac56 | 318 | clear_bit(Rpending, &m->wsched); |
947867aa DM |
319 | p9_debug(P9_DEBUG_TRANS, "read mux %p pos %zd size: %zd = %zd\n", |
320 | m, m->rc.offset, m->rc.capacity, | |
321 | m->rc.capacity - m->rc.offset); | |
322 | err = p9_fd_read(m->client, m->rc.sdata + m->rc.offset, | |
323 | m->rc.capacity - m->rc.offset); | |
5d385153 | 324 | p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); |
947867aa | 325 | if (err == -EAGAIN) |
0462194d | 326 | goto end_clear; |
8a0dc95f | 327 | |
5503ac56 EVH |
328 | if (err <= 0) |
329 | goto error; | |
330 | ||
947867aa | 331 | m->rc.offset += err; |
1b0a763b | 332 | |
947867aa DM |
333 | /* header read in */ |
334 | if ((!m->req) && (m->rc.offset == m->rc.capacity)) { | |
5d385153 | 335 | p9_debug(P9_DEBUG_TRANS, "got new header\n"); |
1b0a763b | 336 | |
947867aa DM |
337 | err = p9_parse_header(&m->rc, NULL, NULL, NULL, 0); |
338 | if (err) { | |
339 | p9_debug(P9_DEBUG_ERROR, | |
340 | "error parsing header: %d\n", err); | |
341 | goto error; | |
342 | } | |
343 | ||
344 | if (m->rc.size >= m->client->msize) { | |
5d385153 | 345 | p9_debug(P9_DEBUG_ERROR, |
947867aa DM |
346 | "requested packet size too big: %d\n", |
347 | m->rc.size); | |
5503ac56 EVH |
348 | err = -EIO; |
349 | goto error; | |
350 | } | |
351 | ||
5d385153 | 352 | p9_debug(P9_DEBUG_TRANS, |
947867aa DM |
353 | "mux %p pkt: size: %d bytes tag: %d\n", |
354 | m, m->rc.size, m->rc.tag); | |
1b0a763b | 355 | |
947867aa | 356 | m->req = p9_tag_lookup(m->client, m->rc.tag); |
0bfd6845 | 357 | if (!m->req || (m->req->status != REQ_STATUS_SENT)) { |
5d385153 | 358 | p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", |
947867aa | 359 | m->rc.tag); |
1b0a763b EVH |
360 | err = -EIO; |
361 | goto error; | |
362 | } | |
363 | ||
364 | if (m->req->rc == NULL) { | |
3053600e DM |
365 | p9_debug(P9_DEBUG_ERROR, |
366 | "No recv fcall for tag %d (req %p), disconnecting!\n", | |
367 | m->rc.tag, m->req); | |
368 | m->req = NULL; | |
369 | err = -EIO; | |
370 | goto error; | |
1b0a763b | 371 | } |
947867aa DM |
372 | m->rc.sdata = (char *)m->req->rc + sizeof(struct p9_fcall); |
373 | memcpy(m->rc.sdata, m->tmp_buf, m->rc.capacity); | |
374 | m->rc.capacity = m->rc.size; | |
1b0a763b | 375 | } |
5503ac56 | 376 | |
947867aa DM |
377 | /* packet is read in |
378 | * not an else because some packets (like clunk) have no payload | |
379 | */ | |
380 | if ((m->req) && (m->rc.offset == m->rc.capacity)) { | |
5d385153 | 381 | p9_debug(P9_DEBUG_TRANS, "got new packet\n"); |
7eb923b8 | 382 | spin_lock(&m->client->lock); |
1bab88b2 | 383 | if (m->req->status != REQ_STATUS_ERROR) |
2b6e72ed | 384 | status = REQ_STATUS_RCVD; |
91b8534f | 385 | list_del(&m->req->req_list); |
7eb923b8 | 386 | spin_unlock(&m->client->lock); |
2b6e72ed | 387 | p9_client_cb(m->client, m->req, status); |
947867aa DM |
388 | m->rc.sdata = NULL; |
389 | m->rc.offset = 0; | |
390 | m->rc.capacity = 0; | |
1b0a763b | 391 | m->req = NULL; |
5503ac56 EVH |
392 | } |
393 | ||
0462194d SD |
394 | end_clear: |
395 | clear_bit(Rworksched, &m->wsched); | |
396 | ||
5503ac56 EVH |
397 | if (!list_empty(&m->req_list)) { |
398 | if (test_and_clear_bit(Rpending, &m->wsched)) | |
399 | n = POLLIN; | |
400 | else | |
401 | n = p9_fd_poll(m->client, NULL); | |
402 | ||
0462194d | 403 | if ((n & POLLIN) && !test_and_set_bit(Rworksched, &m->wsched)) { |
5d385153 | 404 | p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); |
61edeeed | 405 | schedule_work(&m->rq); |
0462194d SD |
406 | } |
407 | } | |
5503ac56 EVH |
408 | |
409 | return; | |
5503ac56 EVH |
410 | error: |
411 | p9_conn_cancel(m, err); | |
412 | clear_bit(Rworksched, &m->wsched); | |
413 | } | |
414 | ||
415 | /** | |
416 | * p9_fd_write - write to a socket | |
417 | * @client: client instance | |
418 | * @v: buffer to send data from | |
419 | * @len: size of send buffer | |
ee443996 | 420 | * |
8a0dc95f | 421 | */ |
ee443996 | 422 | |
5503ac56 | 423 | static int p9_fd_write(struct p9_client *client, void *v, int len) |
8a0dc95f | 424 | { |
670986ec | 425 | ssize_t ret; |
5503ac56 | 426 | struct p9_trans_fd *ts = NULL; |
8a0dc95f | 427 | |
5503ac56 EVH |
428 | if (client && client->status != Disconnected) |
429 | ts = client->trans; | |
8a0dc95f | 430 | |
5503ac56 EVH |
431 | if (!ts) |
432 | return -EREMOTEIO; | |
8a0dc95f | 433 | |
5503ac56 | 434 | if (!(ts->wr->f_flags & O_NONBLOCK)) |
5d385153 | 435 | p9_debug(P9_DEBUG_ERROR, "blocking write ...\n"); |
992b3f1d | 436 | |
670986ec | 437 | ret = kernel_write(ts->wr, v, len, &ts->wr->f_pos); |
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 | ||
ac6424b9 | 525 | static int p9_pollwake(wait_queue_entry_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 | ||
c4fac910 DH |
723 | static int p9_fd_show_options(struct seq_file *m, struct p9_client *clnt) |
724 | { | |
725 | if (clnt->trans_mod == &p9_tcp_trans) { | |
726 | if (clnt->trans_opts.tcp.port != P9_PORT) | |
61b272c3 | 727 | seq_printf(m, ",port=%u", clnt->trans_opts.tcp.port); |
c4fac910 DH |
728 | } else if (clnt->trans_mod == &p9_fd_trans) { |
729 | if (clnt->trans_opts.fd.rfd != ~0) | |
61b272c3 | 730 | seq_printf(m, ",rfd=%u", clnt->trans_opts.fd.rfd); |
c4fac910 | 731 | if (clnt->trans_opts.fd.wfd != ~0) |
61b272c3 | 732 | seq_printf(m, ",wfd=%u", clnt->trans_opts.fd.wfd); |
c4fac910 DH |
733 | } |
734 | return 0; | |
735 | } | |
736 | ||
a80d923e | 737 | /** |
0e15597e AK |
738 | * parse_opts - parse mount options into p9_fd_opts structure |
739 | * @params: options string passed from mount | |
740 | * @opts: fd transport-specific structure to parse options into | |
a80d923e | 741 | * |
bb8ffdfc | 742 | * Returns 0 upon success, -ERRNO upon failure |
a80d923e | 743 | */ |
bd238fb4 | 744 | |
bb8ffdfc | 745 | static int parse_opts(char *params, struct p9_fd_opts *opts) |
bd238fb4 | 746 | { |
a80d923e EVH |
747 | char *p; |
748 | substring_t args[MAX_OPT_ARGS]; | |
749 | int option; | |
d8c8a9e3 | 750 | char *options, *tmp_options; |
bd238fb4 | 751 | |
a80d923e EVH |
752 | opts->port = P9_PORT; |
753 | opts->rfd = ~0; | |
754 | opts->wfd = ~0; | |
c4fac910 | 755 | opts->privport = false; |
bd238fb4 | 756 | |
bb8ffdfc EVH |
757 | if (!params) |
758 | return 0; | |
759 | ||
d8c8a9e3 EVH |
760 | tmp_options = kstrdup(params, GFP_KERNEL); |
761 | if (!tmp_options) { | |
5d385153 JP |
762 | p9_debug(P9_DEBUG_ERROR, |
763 | "failed to allocate copy of option string\n"); | |
bb8ffdfc EVH |
764 | return -ENOMEM; |
765 | } | |
d8c8a9e3 | 766 | options = tmp_options; |
bd238fb4 | 767 | |
a80d923e EVH |
768 | while ((p = strsep(&options, ",")) != NULL) { |
769 | int token; | |
bb8ffdfc | 770 | int r; |
a80d923e EVH |
771 | if (!*p) |
772 | continue; | |
773 | token = match_token(p, tokens, args); | |
2f28c8b3 | 774 | if ((token != Opt_err) && (token != Opt_privport)) { |
15da4b16 AK |
775 | r = match_int(&args[0], &option); |
776 | if (r < 0) { | |
5d385153 JP |
777 | p9_debug(P9_DEBUG_ERROR, |
778 | "integer field, but no integer?\n"); | |
15da4b16 AK |
779 | continue; |
780 | } | |
a80d923e EVH |
781 | } |
782 | switch (token) { | |
783 | case Opt_port: | |
784 | opts->port = option; | |
785 | break; | |
786 | case Opt_rfdno: | |
787 | opts->rfd = option; | |
788 | break; | |
789 | case Opt_wfdno: | |
790 | opts->wfd = option; | |
791 | break; | |
2f28c8b3 | 792 | case Opt_privport: |
c4fac910 | 793 | opts->privport = true; |
2f28c8b3 | 794 | break; |
a80d923e EVH |
795 | default: |
796 | continue; | |
797 | } | |
bd238fb4 | 798 | } |
d8c8a9e3 EVH |
799 | |
800 | kfree(tmp_options); | |
bb8ffdfc | 801 | return 0; |
bd238fb4 | 802 | } |
bd238fb4 | 803 | |
8b81ef58 | 804 | static int p9_fd_open(struct p9_client *client, int rfd, int wfd) |
bd238fb4 | 805 | { |
263c5828 | 806 | struct p9_trans_fd *ts = kzalloc(sizeof(struct p9_trans_fd), |
a80d923e EVH |
807 | GFP_KERNEL); |
808 | if (!ts) | |
809 | return -ENOMEM; | |
bd238fb4 | 810 | |
a80d923e EVH |
811 | ts->rd = fget(rfd); |
812 | ts->wr = fget(wfd); | |
813 | if (!ts->rd || !ts->wr) { | |
814 | if (ts->rd) | |
815 | fput(ts->rd); | |
816 | if (ts->wr) | |
817 | fput(ts->wr); | |
818 | kfree(ts); | |
819 | return -EIO; | |
bd238fb4 LI |
820 | } |
821 | ||
8b81ef58 EVH |
822 | client->trans = ts; |
823 | client->status = Connected; | |
bd238fb4 | 824 | |
a80d923e | 825 | return 0; |
bd238fb4 | 826 | } |
bd238fb4 | 827 | |
8b81ef58 | 828 | static int p9_socket_open(struct p9_client *client, struct socket *csocket) |
bd238fb4 | 829 | { |
6b18662e | 830 | struct p9_trans_fd *p; |
56b31d1c | 831 | struct file *file; |
6b18662e | 832 | |
263c5828 | 833 | p = kzalloc(sizeof(struct p9_trans_fd), GFP_KERNEL); |
6b18662e AV |
834 | if (!p) |
835 | return -ENOMEM; | |
bd238fb4 LI |
836 | |
837 | csocket->sk->sk_allocation = GFP_NOIO; | |
aab174f0 | 838 | file = sock_alloc_file(csocket, 0, NULL); |
56b31d1c | 839 | if (IS_ERR(file)) { |
5d385153 JP |
840 | pr_err("%s (%d): failed to map fd\n", |
841 | __func__, task_pid_nr(current)); | |
6b18662e | 842 | kfree(p); |
56b31d1c | 843 | return PTR_ERR(file); |
bd238fb4 LI |
844 | } |
845 | ||
56b31d1c AV |
846 | get_file(file); |
847 | p->wr = p->rd = file; | |
6b18662e AV |
848 | client->trans = p; |
849 | client->status = Connected; | |
850 | ||
6b18662e AV |
851 | p->rd->f_flags |= O_NONBLOCK; |
852 | ||
263c5828 | 853 | p9_conn_create(client); |
bd238fb4 LI |
854 | return 0; |
855 | } | |
856 | ||
bd238fb4 | 857 | /** |
263c5828 | 858 | * p9_mux_destroy - cancels all pending requests of mux |
5503ac56 | 859 | * @m: mux to destroy |
bd238fb4 LI |
860 | * |
861 | */ | |
ee443996 | 862 | |
5503ac56 | 863 | static void p9_conn_destroy(struct p9_conn *m) |
bd238fb4 | 864 | { |
5d385153 JP |
865 | p9_debug(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", |
866 | m, m->mux_list.prev, m->mux_list.next); | |
bd238fb4 | 867 | |
5503ac56 EVH |
868 | p9_mux_poll_stop(m); |
869 | cancel_work_sync(&m->rq); | |
870 | cancel_work_sync(&m->wq); | |
bd238fb4 | 871 | |
5503ac56 | 872 | p9_conn_cancel(m, -ECONNRESET); |
bd238fb4 | 873 | |
5503ac56 | 874 | m->client = NULL; |
bd238fb4 LI |
875 | } |
876 | ||
877 | /** | |
8b81ef58 EVH |
878 | * p9_fd_close - shutdown file descriptor transport |
879 | * @client: client instance | |
bd238fb4 LI |
880 | * |
881 | */ | |
ee443996 | 882 | |
8b81ef58 | 883 | static void p9_fd_close(struct p9_client *client) |
bd238fb4 LI |
884 | { |
885 | struct p9_trans_fd *ts; | |
886 | ||
8b81ef58 | 887 | if (!client) |
bd238fb4 LI |
888 | return; |
889 | ||
8b81ef58 | 890 | ts = client->trans; |
bd238fb4 LI |
891 | if (!ts) |
892 | return; | |
893 | ||
8b81ef58 EVH |
894 | client->status = Disconnected; |
895 | ||
263c5828 | 896 | p9_conn_destroy(&ts->conn); |
8a0dc95f | 897 | |
bd238fb4 LI |
898 | if (ts->rd) |
899 | fput(ts->rd); | |
900 | if (ts->wr) | |
901 | fput(ts->wr); | |
8b81ef58 | 902 | |
bd238fb4 LI |
903 | kfree(ts); |
904 | } | |
905 | ||
887b3ece EVH |
906 | /* |
907 | * stolen from NFS - maybe should be made a generic function? | |
908 | */ | |
909 | static inline int valid_ipaddr4(const char *buf) | |
910 | { | |
911 | int rc, count, in[4]; | |
912 | ||
913 | rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); | |
914 | if (rc != 4) | |
915 | return -EINVAL; | |
916 | for (count = 0; count < 4; count++) { | |
917 | if (in[count] > 255) | |
918 | return -EINVAL; | |
919 | } | |
920 | return 0; | |
921 | } | |
922 | ||
2f28c8b3 JG |
923 | static int p9_bind_privport(struct socket *sock) |
924 | { | |
925 | struct sockaddr_in cl; | |
926 | int port, err = -EINVAL; | |
927 | ||
928 | memset(&cl, 0, sizeof(cl)); | |
929 | cl.sin_family = AF_INET; | |
930 | cl.sin_addr.s_addr = INADDR_ANY; | |
931 | for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) { | |
932 | cl.sin_port = htons((ushort)port); | |
933 | err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl)); | |
934 | if (err != -EADDRINUSE) | |
935 | break; | |
936 | } | |
937 | return err; | |
938 | } | |
939 | ||
940 | ||
8b81ef58 EVH |
941 | static int |
942 | p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
943 | { |
944 | int err; | |
a80d923e EVH |
945 | struct socket *csocket; |
946 | struct sockaddr_in sin_server; | |
947 | struct p9_fd_opts opts; | |
948 | ||
bb8ffdfc EVH |
949 | err = parse_opts(args, &opts); |
950 | if (err < 0) | |
8b81ef58 | 951 | return err; |
a80d923e | 952 | |
887b3ece | 953 | if (valid_ipaddr4(addr) < 0) |
8b81ef58 | 954 | return -EINVAL; |
887b3ece | 955 | |
a80d923e | 956 | csocket = NULL; |
a80d923e | 957 | |
c4fac910 DH |
958 | client->trans_opts.tcp.port = opts.port; |
959 | client->trans_opts.tcp.privport = opts.privport; | |
a80d923e EVH |
960 | sin_server.sin_family = AF_INET; |
961 | sin_server.sin_addr.s_addr = in_aton(addr); | |
962 | sin_server.sin_port = htons(opts.port); | |
0c5c9fb5 | 963 | err = __sock_create(current->nsproxy->net_ns, PF_INET, |
e75762fd | 964 | SOCK_STREAM, IPPROTO_TCP, &csocket, 1); |
6b18662e | 965 | if (err) { |
5d385153 JP |
966 | pr_err("%s (%d): problem creating socket\n", |
967 | __func__, task_pid_nr(current)); | |
6b18662e | 968 | return err; |
a80d923e EVH |
969 | } |
970 | ||
2f28c8b3 JG |
971 | if (opts.privport) { |
972 | err = p9_bind_privport(csocket); | |
973 | if (err < 0) { | |
974 | pr_err("%s (%d): problem binding to privport\n", | |
975 | __func__, task_pid_nr(current)); | |
976 | sock_release(csocket); | |
977 | return err; | |
978 | } | |
979 | } | |
980 | ||
a80d923e EVH |
981 | err = csocket->ops->connect(csocket, |
982 | (struct sockaddr *)&sin_server, | |
983 | sizeof(struct sockaddr_in), 0); | |
984 | if (err < 0) { | |
5d385153 JP |
985 | pr_err("%s (%d): problem connecting socket to %s\n", |
986 | __func__, task_pid_nr(current), addr); | |
a80d923e | 987 | sock_release(csocket); |
6b18662e AV |
988 | return err; |
989 | } | |
a80d923e | 990 | |
6b18662e | 991 | return p9_socket_open(client, csocket); |
a80d923e EVH |
992 | } |
993 | ||
8b81ef58 EVH |
994 | static int |
995 | p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
996 | { |
997 | int err; | |
998 | struct socket *csocket; | |
999 | struct sockaddr_un sun_server; | |
a80d923e EVH |
1000 | |
1001 | csocket = NULL; | |
a80d923e | 1002 | |
cff6b8a9 | 1003 | if (strlen(addr) >= UNIX_PATH_MAX) { |
5d385153 JP |
1004 | pr_err("%s (%d): address too long: %s\n", |
1005 | __func__, task_pid_nr(current), addr); | |
6b18662e | 1006 | return -ENAMETOOLONG; |
a80d923e EVH |
1007 | } |
1008 | ||
1009 | sun_server.sun_family = PF_UNIX; | |
1010 | strcpy(sun_server.sun_path, addr); | |
0c5c9fb5 | 1011 | err = __sock_create(current->nsproxy->net_ns, PF_UNIX, |
e75762fd | 1012 | SOCK_STREAM, 0, &csocket, 1); |
6b18662e | 1013 | if (err < 0) { |
5d385153 JP |
1014 | pr_err("%s (%d): problem creating socket\n", |
1015 | __func__, task_pid_nr(current)); | |
1016 | ||
6b18662e AV |
1017 | return err; |
1018 | } | |
a80d923e EVH |
1019 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, |
1020 | sizeof(struct sockaddr_un) - 1, 0); | |
1021 | if (err < 0) { | |
5d385153 JP |
1022 | pr_err("%s (%d): problem connecting socket: %s: %d\n", |
1023 | __func__, task_pid_nr(current), addr, err); | |
a80d923e | 1024 | sock_release(csocket); |
6b18662e AV |
1025 | return err; |
1026 | } | |
a80d923e | 1027 | |
6b18662e | 1028 | return p9_socket_open(client, csocket); |
a80d923e EVH |
1029 | } |
1030 | ||
8b81ef58 EVH |
1031 | static int |
1032 | p9_fd_create(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
1033 | { |
1034 | int err; | |
a80d923e EVH |
1035 | struct p9_fd_opts opts; |
1036 | ||
1037 | parse_opts(args, &opts); | |
c4fac910 DH |
1038 | client->trans_opts.fd.rfd = opts.rfd; |
1039 | client->trans_opts.fd.wfd = opts.wfd; | |
a80d923e EVH |
1040 | |
1041 | if (opts.rfd == ~0 || opts.wfd == ~0) { | |
5d385153 | 1042 | pr_err("Insufficient options for proto=fd\n"); |
8b81ef58 | 1043 | return -ENOPROTOOPT; |
a80d923e EVH |
1044 | } |
1045 | ||
8b81ef58 | 1046 | err = p9_fd_open(client, opts.rfd, opts.wfd); |
a80d923e | 1047 | if (err < 0) |
6b18662e | 1048 | return err; |
a80d923e | 1049 | |
263c5828 | 1050 | p9_conn_create(client); |
8a0dc95f | 1051 | |
8b81ef58 | 1052 | return 0; |
a80d923e EVH |
1053 | } |
1054 | ||
1055 | static struct p9_trans_module p9_tcp_trans = { | |
1056 | .name = "tcp", | |
1057 | .maxsize = MAX_SOCK_BUF, | |
f94741fd | 1058 | .def = 0, |
8b81ef58 EVH |
1059 | .create = p9_fd_create_tcp, |
1060 | .close = p9_fd_close, | |
91b8534f EVH |
1061 | .request = p9_fd_request, |
1062 | .cancel = p9_fd_cancel, | |
afd8d654 | 1063 | .cancelled = p9_fd_cancelled, |
c4fac910 | 1064 | .show_options = p9_fd_show_options, |
72029fe8 | 1065 | .owner = THIS_MODULE, |
a80d923e EVH |
1066 | }; |
1067 | ||
1068 | static struct p9_trans_module p9_unix_trans = { | |
1069 | .name = "unix", | |
1070 | .maxsize = MAX_SOCK_BUF, | |
1071 | .def = 0, | |
8b81ef58 EVH |
1072 | .create = p9_fd_create_unix, |
1073 | .close = p9_fd_close, | |
91b8534f EVH |
1074 | .request = p9_fd_request, |
1075 | .cancel = p9_fd_cancel, | |
afd8d654 | 1076 | .cancelled = p9_fd_cancelled, |
c4fac910 | 1077 | .show_options = p9_fd_show_options, |
72029fe8 | 1078 | .owner = THIS_MODULE, |
a80d923e EVH |
1079 | }; |
1080 | ||
1081 | static struct p9_trans_module p9_fd_trans = { | |
1082 | .name = "fd", | |
1083 | .maxsize = MAX_SOCK_BUF, | |
1084 | .def = 0, | |
8b81ef58 EVH |
1085 | .create = p9_fd_create, |
1086 | .close = p9_fd_close, | |
91b8534f EVH |
1087 | .request = p9_fd_request, |
1088 | .cancel = p9_fd_cancel, | |
afd8d654 | 1089 | .cancelled = p9_fd_cancelled, |
c4fac910 | 1090 | .show_options = p9_fd_show_options, |
72029fe8 | 1091 | .owner = THIS_MODULE, |
a80d923e EVH |
1092 | }; |
1093 | ||
5503ac56 EVH |
1094 | /** |
1095 | * p9_poll_proc - poll worker thread | |
1096 | * @a: thread state and arguments | |
1097 | * | |
1098 | * polls all v9fs transports for new events and queues the appropriate | |
1099 | * work to the work queue | |
1100 | * | |
1101 | */ | |
1102 | ||
aa70c585 | 1103 | static void p9_poll_workfn(struct work_struct *work) |
5503ac56 EVH |
1104 | { |
1105 | unsigned long flags; | |
1106 | ||
5d385153 | 1107 | p9_debug(P9_DEBUG_TRANS, "start %p\n", current); |
aa70c585 | 1108 | |
5503ac56 EVH |
1109 | spin_lock_irqsave(&p9_poll_lock, flags); |
1110 | while (!list_empty(&p9_poll_pending_list)) { | |
1111 | struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, | |
1112 | struct p9_conn, | |
1113 | poll_pending_link); | |
1114 | list_del_init(&conn->poll_pending_link); | |
1115 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1116 | ||
1117 | p9_poll_mux(conn); | |
1118 | ||
1119 | spin_lock_irqsave(&p9_poll_lock, flags); | |
1120 | } | |
1121 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1122 | ||
5d385153 | 1123 | p9_debug(P9_DEBUG_TRANS, "finish\n"); |
5503ac56 EVH |
1124 | } |
1125 | ||
887b3ece | 1126 | int p9_trans_fd_init(void) |
a80d923e EVH |
1127 | { |
1128 | v9fs_register_trans(&p9_tcp_trans); | |
1129 | v9fs_register_trans(&p9_unix_trans); | |
1130 | v9fs_register_trans(&p9_fd_trans); | |
1131 | ||
3387b804 | 1132 | return 0; |
a80d923e | 1133 | } |
72029fe8 TH |
1134 | |
1135 | void p9_trans_fd_exit(void) | |
1136 | { | |
43829731 | 1137 | flush_work(&p9_poll_work); |
72029fe8 TH |
1138 | v9fs_unregister_trans(&p9_tcp_trans); |
1139 | v9fs_unregister_trans(&p9_unix_trans); | |
1140 | v9fs_unregister_trans(&p9_fd_trans); | |
1141 | } |