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 | |
ee443996 EVH |
69 | /** |
70 | * struct p9_trans_fd - transport state | |
71 | * @rd: reference to file to read from | |
72 | * @wr: reference of file to write to | |
73 | * @conn: connection state reference | |
74 | * | |
75 | */ | |
76 | ||
bd238fb4 LI |
77 | struct p9_trans_fd { |
78 | struct file *rd; | |
79 | struct file *wr; | |
8a0dc95f | 80 | struct p9_conn *conn; |
bd238fb4 LI |
81 | }; |
82 | ||
a80d923e EVH |
83 | /* |
84 | * Option Parsing (code inspired by NFS code) | |
85 | * - a little lazy - parse all fd-transport options | |
86 | */ | |
bd238fb4 | 87 | |
a80d923e EVH |
88 | enum { |
89 | /* Options that take integer arguments */ | |
55762690 | 90 | Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
2f28c8b3 JG |
91 | /* Options that take no arguments */ |
92 | Opt_privport, | |
a80d923e | 93 | }; |
bd238fb4 | 94 | |
a447c093 | 95 | static const match_table_t tokens = { |
a80d923e EVH |
96 | {Opt_port, "port=%u"}, |
97 | {Opt_rfdno, "rfdno=%u"}, | |
98 | {Opt_wfdno, "wfdno=%u"}, | |
2f28c8b3 | 99 | {Opt_privport, "privport"}, |
55762690 | 100 | {Opt_err, NULL}, |
a80d923e | 101 | }; |
bd238fb4 | 102 | |
8a0dc95f EVH |
103 | enum { |
104 | Rworksched = 1, /* read work scheduled or running */ | |
105 | Rpending = 2, /* can read */ | |
106 | Wworksched = 4, /* write work scheduled or running */ | |
107 | Wpending = 8, /* can write */ | |
108 | }; | |
109 | ||
992b3f1d TH |
110 | struct p9_poll_wait { |
111 | struct p9_conn *conn; | |
112 | wait_queue_t wait; | |
113 | wait_queue_head_t *wait_addr; | |
ee443996 EVH |
114 | }; |
115 | ||
116 | /** | |
117 | * struct p9_conn - fd mux connection state information | |
ee443996 | 118 | * @mux_list: list link for mux to manage multiple connections (?) |
8b81ef58 | 119 | * @client: reference to client instance for this connection |
ee443996 | 120 | * @err: error state |
ee443996 EVH |
121 | * @req_list: accounting for requests which have been sent |
122 | * @unsent_req_list: accounting for requests that haven't been sent | |
1b0a763b EVH |
123 | * @req: current request being processed (if any) |
124 | * @tmp_buf: temporary buffer to read in header | |
125 | * @rsize: amount to read for current frame | |
ee443996 EVH |
126 | * @rpos: read position in current frame |
127 | * @rbuf: current read buffer | |
128 | * @wpos: write position for current frame | |
129 | * @wsize: amount of data to write for current frame | |
130 | * @wbuf: current write buffer | |
0e15597e | 131 | * @poll_pending_link: pending links to be polled per conn |
ee443996 | 132 | * @poll_wait: array of wait_q's for various worker threads |
ee443996 EVH |
133 | * @pt: poll state |
134 | * @rq: current read work | |
135 | * @wq: current write work | |
136 | * @wsched: ???? | |
137 | * | |
138 | */ | |
8a0dc95f EVH |
139 | |
140 | struct p9_conn { | |
8a0dc95f | 141 | struct list_head mux_list; |
8b81ef58 | 142 | struct p9_client *client; |
8a0dc95f | 143 | int err; |
8a0dc95f EVH |
144 | struct list_head req_list; |
145 | struct list_head unsent_req_list; | |
1b0a763b EVH |
146 | struct p9_req_t *req; |
147 | char tmp_buf[7]; | |
148 | int rsize; | |
8a0dc95f EVH |
149 | int rpos; |
150 | char *rbuf; | |
151 | int wpos; | |
152 | int wsize; | |
153 | char *wbuf; | |
992b3f1d TH |
154 | struct list_head poll_pending_link; |
155 | struct p9_poll_wait poll_wait[MAXPOLLWADDR]; | |
8a0dc95f EVH |
156 | poll_table pt; |
157 | struct work_struct rq; | |
158 | struct work_struct wq; | |
159 | unsigned long wsched; | |
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 | 214 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { |
673d62cd EVH |
215 | req->status = REQ_STATUS_ERROR; |
216 | if (!req->t_err) | |
217 | req->t_err = err; | |
5503ac56 EVH |
218 | list_move(&req->req_list, &cancel_list); |
219 | } | |
220 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { | |
673d62cd EVH |
221 | req->status = REQ_STATUS_ERROR; |
222 | if (!req->t_err) | |
223 | req->t_err = err; | |
5503ac56 | 224 | list_move(&req->req_list, &cancel_list); |
8a0dc95f | 225 | } |
91b8534f | 226 | spin_unlock_irqrestore(&m->client->lock, flags); |
8a0dc95f | 227 | |
5503ac56 | 228 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { |
5d385153 | 229 | p9_debug(P9_DEBUG_ERROR, "call back req %p\n", req); |
1bab88b2 | 230 | list_del(&req->req_list); |
91b8534f | 231 | p9_client_cb(m->client, req); |
8a0dc95f | 232 | } |
8a0dc95f EVH |
233 | } |
234 | ||
29af9309 | 235 | static int |
5503ac56 | 236 | p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt) |
8a0dc95f | 237 | { |
5503ac56 EVH |
238 | int ret, n; |
239 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 240 | |
5503ac56 EVH |
241 | if (client && client->status == Connected) |
242 | ts = client->trans; | |
7dc5d24b | 243 | |
5503ac56 EVH |
244 | if (!ts) |
245 | return -EREMOTEIO; | |
7dc5d24b | 246 | |
5503ac56 EVH |
247 | if (!ts->rd->f_op || !ts->rd->f_op->poll) |
248 | return -EIO; | |
8a0dc95f | 249 | |
5503ac56 EVH |
250 | if (!ts->wr->f_op || !ts->wr->f_op->poll) |
251 | return -EIO; | |
992b3f1d | 252 | |
5503ac56 EVH |
253 | ret = ts->rd->f_op->poll(ts->rd, pt); |
254 | if (ret < 0) | |
255 | return ret; | |
992b3f1d | 256 | |
5503ac56 EVH |
257 | if (ts->rd != ts->wr) { |
258 | n = ts->wr->f_op->poll(ts->wr, pt); | |
259 | if (n < 0) | |
260 | return n; | |
261 | ret = (ret & ~POLLOUT) | (n & ~POLLIN); | |
262 | } | |
263 | ||
264 | return ret; | |
992b3f1d TH |
265 | } |
266 | ||
8a0dc95f | 267 | /** |
5503ac56 EVH |
268 | * p9_fd_read- read from a fd |
269 | * @client: client instance | |
270 | * @v: buffer to receive data into | |
271 | * @len: size of receive buffer | |
ee443996 | 272 | * |
8a0dc95f | 273 | */ |
ee443996 | 274 | |
5503ac56 | 275 | static int p9_fd_read(struct p9_client *client, void *v, int len) |
8a0dc95f | 276 | { |
5503ac56 EVH |
277 | int ret; |
278 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 279 | |
5503ac56 EVH |
280 | if (client && client->status != Disconnected) |
281 | ts = client->trans; | |
8a0dc95f | 282 | |
5503ac56 EVH |
283 | if (!ts) |
284 | return -EREMOTEIO; | |
8a0dc95f | 285 | |
5503ac56 | 286 | if (!(ts->rd->f_flags & O_NONBLOCK)) |
5d385153 | 287 | p9_debug(P9_DEBUG_ERROR, "blocking read ...\n"); |
8a0dc95f | 288 | |
5503ac56 EVH |
289 | ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); |
290 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
291 | client->status = Disconnected; | |
292 | return ret; | |
8a0dc95f EVH |
293 | } |
294 | ||
295 | /** | |
5503ac56 EVH |
296 | * p9_read_work - called when there is some data to be read from a transport |
297 | * @work: container of work to be done | |
ee443996 | 298 | * |
8a0dc95f | 299 | */ |
ee443996 | 300 | |
5503ac56 | 301 | static void p9_read_work(struct work_struct *work) |
8a0dc95f | 302 | { |
5503ac56 EVH |
303 | int n, err; |
304 | struct p9_conn *m; | |
5503ac56 EVH |
305 | |
306 | m = container_of(work, struct p9_conn, rq); | |
8a0dc95f EVH |
307 | |
308 | if (m->err < 0) | |
309 | return; | |
310 | ||
5d385153 | 311 | p9_debug(P9_DEBUG_TRANS, "start mux %p pos %d\n", m, m->rpos); |
8a0dc95f | 312 | |
1b0a763b EVH |
313 | if (!m->rbuf) { |
314 | m->rbuf = m->tmp_buf; | |
5503ac56 | 315 | m->rpos = 0; |
1b0a763b | 316 | m->rsize = 7; /* start by reading header */ |
8a0dc95f EVH |
317 | } |
318 | ||
5503ac56 | 319 | clear_bit(Rpending, &m->wsched); |
5d385153 JP |
320 | p9_debug(P9_DEBUG_TRANS, "read mux %p pos %d size: %d = %d\n", |
321 | m, m->rpos, m->rsize, m->rsize-m->rpos); | |
5503ac56 | 322 | err = p9_fd_read(m->client, m->rbuf + m->rpos, |
1b0a763b | 323 | m->rsize - m->rpos); |
5d385153 | 324 | p9_debug(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); |
5503ac56 | 325 | if (err == -EAGAIN) { |
0462194d | 326 | goto end_clear; |
8a0dc95f | 327 | } |
8a0dc95f | 328 | |
5503ac56 EVH |
329 | if (err <= 0) |
330 | goto error; | |
331 | ||
332 | m->rpos += err; | |
1b0a763b EVH |
333 | |
334 | if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */ | |
335 | u16 tag; | |
5d385153 | 336 | p9_debug(P9_DEBUG_TRANS, "got new header\n"); |
1b0a763b EVH |
337 | |
338 | n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */ | |
5503ac56 | 339 | if (n >= m->client->msize) { |
5d385153 JP |
340 | p9_debug(P9_DEBUG_ERROR, |
341 | "requested packet size too big: %d\n", n); | |
5503ac56 EVH |
342 | err = -EIO; |
343 | goto error; | |
344 | } | |
345 | ||
1b0a763b | 346 | tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */ |
5d385153 JP |
347 | p9_debug(P9_DEBUG_TRANS, |
348 | "mux %p pkt: size: %d bytes tag: %d\n", m, n, tag); | |
1b0a763b EVH |
349 | |
350 | m->req = p9_tag_lookup(m->client, tag); | |
1bab88b2 LI |
351 | if (!m->req || (m->req->status != REQ_STATUS_SENT && |
352 | m->req->status != REQ_STATUS_FLSH)) { | |
5d385153 JP |
353 | p9_debug(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", |
354 | tag); | |
1b0a763b EVH |
355 | err = -EIO; |
356 | goto error; | |
357 | } | |
358 | ||
359 | if (m->req->rc == NULL) { | |
360 | m->req->rc = kmalloc(sizeof(struct p9_fcall) + | |
eeff66ef | 361 | m->client->msize, GFP_NOFS); |
1b0a763b EVH |
362 | if (!m->req->rc) { |
363 | m->req = NULL; | |
364 | err = -ENOMEM; | |
365 | goto error; | |
366 | } | |
367 | } | |
368 | m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall); | |
369 | memcpy(m->rbuf, m->tmp_buf, m->rsize); | |
370 | m->rsize = n; | |
371 | } | |
5503ac56 | 372 | |
1b0a763b EVH |
373 | /* not an else because some packets (like clunk) have no payload */ |
374 | if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */ | |
5d385153 | 375 | p9_debug(P9_DEBUG_TRANS, "got new packet\n"); |
7eb923b8 | 376 | spin_lock(&m->client->lock); |
1bab88b2 LI |
377 | if (m->req->status != REQ_STATUS_ERROR) |
378 | m->req->status = REQ_STATUS_RCVD; | |
91b8534f | 379 | list_del(&m->req->req_list); |
7eb923b8 | 380 | spin_unlock(&m->client->lock); |
91b8534f | 381 | p9_client_cb(m->client, m->req); |
1b0a763b EVH |
382 | m->rbuf = NULL; |
383 | m->rpos = 0; | |
384 | m->rsize = 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 EVH |
575 | /** |
576 | * p9_conn_create - allocate and initialize the per-session mux data | |
577 | * @client: client instance | |
578 | * | |
579 | * Note: Creates the polling task if this is the first session. | |
580 | */ | |
8a0dc95f | 581 | |
5503ac56 EVH |
582 | static struct p9_conn *p9_conn_create(struct p9_client *client) |
583 | { | |
95820a36 | 584 | int n; |
5503ac56 | 585 | struct p9_conn *m; |
8a0dc95f | 586 | |
5d385153 | 587 | p9_debug(P9_DEBUG_TRANS, "client %p msize %d\n", client, client->msize); |
5503ac56 EVH |
588 | m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL); |
589 | if (!m) | |
590 | return ERR_PTR(-ENOMEM); | |
8a0dc95f | 591 | |
5503ac56 EVH |
592 | INIT_LIST_HEAD(&m->mux_list); |
593 | m->client = client; | |
8a0dc95f | 594 | |
5503ac56 EVH |
595 | INIT_LIST_HEAD(&m->req_list); |
596 | INIT_LIST_HEAD(&m->unsent_req_list); | |
597 | INIT_WORK(&m->rq, p9_read_work); | |
598 | INIT_WORK(&m->wq, p9_write_work); | |
599 | INIT_LIST_HEAD(&m->poll_pending_link); | |
600 | init_poll_funcptr(&m->pt, p9_pollwait); | |
8a0dc95f | 601 | |
5503ac56 EVH |
602 | n = p9_fd_poll(client, &m->pt); |
603 | if (n & POLLIN) { | |
5d385153 | 604 | p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); |
5503ac56 EVH |
605 | set_bit(Rpending, &m->wsched); |
606 | } | |
8a0dc95f | 607 | |
5503ac56 | 608 | if (n & POLLOUT) { |
5d385153 | 609 | p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); |
5503ac56 EVH |
610 | set_bit(Wpending, &m->wsched); |
611 | } | |
612 | ||
5503ac56 EVH |
613 | return m; |
614 | } | |
8a0dc95f | 615 | |
5503ac56 EVH |
616 | /** |
617 | * p9_poll_mux - polls a mux and schedules read or write works if necessary | |
618 | * @m: connection to poll | |
619 | * | |
620 | */ | |
621 | ||
622 | static void p9_poll_mux(struct p9_conn *m) | |
623 | { | |
624 | int n; | |
625 | ||
626 | if (m->err < 0) | |
627 | return; | |
628 | ||
629 | n = p9_fd_poll(m->client, NULL); | |
630 | if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { | |
5d385153 | 631 | p9_debug(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n); |
5503ac56 EVH |
632 | if (n >= 0) |
633 | n = -ECONNRESET; | |
634 | p9_conn_cancel(m, n); | |
635 | } | |
636 | ||
637 | if (n & POLLIN) { | |
638 | set_bit(Rpending, &m->wsched); | |
5d385153 | 639 | p9_debug(P9_DEBUG_TRANS, "mux %p can read\n", m); |
5503ac56 | 640 | if (!test_and_set_bit(Rworksched, &m->wsched)) { |
5d385153 | 641 | p9_debug(P9_DEBUG_TRANS, "sched read work %p\n", m); |
61edeeed | 642 | schedule_work(&m->rq); |
5503ac56 EVH |
643 | } |
644 | } | |
8a0dc95f | 645 | |
5503ac56 EVH |
646 | if (n & POLLOUT) { |
647 | set_bit(Wpending, &m->wsched); | |
5d385153 | 648 | p9_debug(P9_DEBUG_TRANS, "mux %p can write\n", m); |
f64f9e71 JP |
649 | if ((m->wsize || !list_empty(&m->unsent_req_list)) && |
650 | !test_and_set_bit(Wworksched, &m->wsched)) { | |
5d385153 | 651 | p9_debug(P9_DEBUG_TRANS, "sched write work %p\n", m); |
61edeeed | 652 | schedule_work(&m->wq); |
5503ac56 EVH |
653 | } |
654 | } | |
8a0dc95f EVH |
655 | } |
656 | ||
657 | /** | |
91b8534f | 658 | * p9_fd_request - send 9P request |
8a0dc95f EVH |
659 | * The function can sleep until the request is scheduled for sending. |
660 | * The function can be interrupted. Return from the function is not | |
91b8534f | 661 | * a guarantee that the request is sent successfully. |
8a0dc95f | 662 | * |
91b8534f EVH |
663 | * @client: client instance |
664 | * @req: request to be sent | |
ee443996 | 665 | * |
8a0dc95f | 666 | */ |
ee443996 | 667 | |
91b8534f | 668 | static int p9_fd_request(struct p9_client *client, struct p9_req_t *req) |
8a0dc95f EVH |
669 | { |
670 | int n; | |
91b8534f EVH |
671 | struct p9_trans_fd *ts = client->trans; |
672 | struct p9_conn *m = ts->conn; | |
8a0dc95f | 673 | |
5d385153 JP |
674 | p9_debug(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", |
675 | m, current, req->tc, req->tc->id); | |
8a0dc95f | 676 | if (m->err < 0) |
91b8534f | 677 | return m->err; |
8a0dc95f | 678 | |
91b8534f | 679 | spin_lock(&client->lock); |
7eb923b8 | 680 | req->status = REQ_STATUS_UNSENT; |
8a0dc95f | 681 | list_add_tail(&req->req_list, &m->unsent_req_list); |
91b8534f | 682 | spin_unlock(&client->lock); |
8a0dc95f EVH |
683 | |
684 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
685 | n = POLLOUT; | |
686 | else | |
8b81ef58 | 687 | n = p9_fd_poll(m->client, NULL); |
8a0dc95f EVH |
688 | |
689 | if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) | |
61edeeed | 690 | schedule_work(&m->wq); |
8a0dc95f | 691 | |
91b8534f | 692 | return 0; |
8a0dc95f EVH |
693 | } |
694 | ||
91b8534f | 695 | static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req) |
8a0dc95f | 696 | { |
7eb923b8 | 697 | int ret = 1; |
8a0dc95f | 698 | |
5d385153 | 699 | p9_debug(P9_DEBUG_TRANS, "client %p req %p\n", client, req); |
8a0dc95f | 700 | |
91b8534f | 701 | spin_lock(&client->lock); |
91b8534f | 702 | |
91b8534f | 703 | if (req->status == REQ_STATUS_UNSENT) { |
1bab88b2 | 704 | list_del(&req->req_list); |
91b8534f | 705 | req->status = REQ_STATUS_FLSHD; |
7eb923b8 | 706 | ret = 0; |
1bab88b2 LI |
707 | } else if (req->status == REQ_STATUS_SENT) |
708 | req->status = REQ_STATUS_FLSH; | |
8a0dc95f | 709 | |
7eb923b8 EVH |
710 | spin_unlock(&client->lock); |
711 | ||
712 | return ret; | |
8a0dc95f EVH |
713 | } |
714 | ||
a80d923e | 715 | /** |
0e15597e AK |
716 | * parse_opts - parse mount options into p9_fd_opts structure |
717 | * @params: options string passed from mount | |
718 | * @opts: fd transport-specific structure to parse options into | |
a80d923e | 719 | * |
bb8ffdfc | 720 | * Returns 0 upon success, -ERRNO upon failure |
a80d923e | 721 | */ |
bd238fb4 | 722 | |
bb8ffdfc | 723 | static int parse_opts(char *params, struct p9_fd_opts *opts) |
bd238fb4 | 724 | { |
a80d923e EVH |
725 | char *p; |
726 | substring_t args[MAX_OPT_ARGS]; | |
727 | int option; | |
d8c8a9e3 | 728 | char *options, *tmp_options; |
bd238fb4 | 729 | |
a80d923e EVH |
730 | opts->port = P9_PORT; |
731 | opts->rfd = ~0; | |
732 | opts->wfd = ~0; | |
bd238fb4 | 733 | |
bb8ffdfc EVH |
734 | if (!params) |
735 | return 0; | |
736 | ||
d8c8a9e3 EVH |
737 | tmp_options = kstrdup(params, GFP_KERNEL); |
738 | if (!tmp_options) { | |
5d385153 JP |
739 | p9_debug(P9_DEBUG_ERROR, |
740 | "failed to allocate copy of option string\n"); | |
bb8ffdfc EVH |
741 | return -ENOMEM; |
742 | } | |
d8c8a9e3 | 743 | options = tmp_options; |
bd238fb4 | 744 | |
a80d923e EVH |
745 | while ((p = strsep(&options, ",")) != NULL) { |
746 | int token; | |
bb8ffdfc | 747 | int r; |
a80d923e EVH |
748 | if (!*p) |
749 | continue; | |
750 | token = match_token(p, tokens, args); | |
2f28c8b3 | 751 | if ((token != Opt_err) && (token != Opt_privport)) { |
15da4b16 AK |
752 | r = match_int(&args[0], &option); |
753 | if (r < 0) { | |
5d385153 JP |
754 | p9_debug(P9_DEBUG_ERROR, |
755 | "integer field, but no integer?\n"); | |
15da4b16 AK |
756 | continue; |
757 | } | |
a80d923e EVH |
758 | } |
759 | switch (token) { | |
760 | case Opt_port: | |
761 | opts->port = option; | |
762 | break; | |
763 | case Opt_rfdno: | |
764 | opts->rfd = option; | |
765 | break; | |
766 | case Opt_wfdno: | |
767 | opts->wfd = option; | |
768 | break; | |
2f28c8b3 JG |
769 | case Opt_privport: |
770 | opts->privport = 1; | |
771 | break; | |
a80d923e EVH |
772 | default: |
773 | continue; | |
774 | } | |
bd238fb4 | 775 | } |
d8c8a9e3 EVH |
776 | |
777 | kfree(tmp_options); | |
bb8ffdfc | 778 | return 0; |
bd238fb4 | 779 | } |
bd238fb4 | 780 | |
8b81ef58 | 781 | static int p9_fd_open(struct p9_client *client, int rfd, int wfd) |
bd238fb4 | 782 | { |
a80d923e EVH |
783 | struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), |
784 | GFP_KERNEL); | |
785 | if (!ts) | |
786 | return -ENOMEM; | |
bd238fb4 | 787 | |
a80d923e EVH |
788 | ts->rd = fget(rfd); |
789 | ts->wr = fget(wfd); | |
790 | if (!ts->rd || !ts->wr) { | |
791 | if (ts->rd) | |
792 | fput(ts->rd); | |
793 | if (ts->wr) | |
794 | fput(ts->wr); | |
795 | kfree(ts); | |
796 | return -EIO; | |
bd238fb4 LI |
797 | } |
798 | ||
8b81ef58 EVH |
799 | client->trans = ts; |
800 | client->status = Connected; | |
bd238fb4 | 801 | |
a80d923e | 802 | return 0; |
bd238fb4 | 803 | } |
bd238fb4 | 804 | |
8b81ef58 | 805 | static int p9_socket_open(struct p9_client *client, struct socket *csocket) |
bd238fb4 | 806 | { |
6b18662e | 807 | struct p9_trans_fd *p; |
56b31d1c AV |
808 | struct file *file; |
809 | int ret; | |
6b18662e AV |
810 | |
811 | p = kmalloc(sizeof(struct p9_trans_fd), GFP_KERNEL); | |
812 | if (!p) | |
813 | return -ENOMEM; | |
bd238fb4 LI |
814 | |
815 | csocket->sk->sk_allocation = GFP_NOIO; | |
aab174f0 | 816 | file = sock_alloc_file(csocket, 0, NULL); |
56b31d1c | 817 | if (IS_ERR(file)) { |
5d385153 JP |
818 | pr_err("%s (%d): failed to map fd\n", |
819 | __func__, task_pid_nr(current)); | |
6b18662e AV |
820 | sock_release(csocket); |
821 | kfree(p); | |
56b31d1c | 822 | return PTR_ERR(file); |
bd238fb4 LI |
823 | } |
824 | ||
56b31d1c AV |
825 | get_file(file); |
826 | p->wr = p->rd = file; | |
6b18662e AV |
827 | client->trans = p; |
828 | client->status = Connected; | |
829 | ||
6b18662e AV |
830 | p->rd->f_flags |= O_NONBLOCK; |
831 | ||
832 | p->conn = p9_conn_create(client); | |
833 | if (IS_ERR(p->conn)) { | |
834 | ret = PTR_ERR(p->conn); | |
835 | p->conn = NULL; | |
836 | kfree(p); | |
837 | sockfd_put(csocket); | |
bd238fb4 LI |
838 | sockfd_put(csocket); |
839 | return ret; | |
840 | } | |
bd238fb4 LI |
841 | return 0; |
842 | } | |
843 | ||
bd238fb4 | 844 | /** |
5503ac56 EVH |
845 | * p9_mux_destroy - cancels all pending requests and frees mux resources |
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; |
5503ac56 | 862 | kfree(m); |
bd238fb4 LI |
863 | } |
864 | ||
865 | /** | |
8b81ef58 EVH |
866 | * p9_fd_close - shutdown file descriptor transport |
867 | * @client: client instance | |
bd238fb4 LI |
868 | * |
869 | */ | |
ee443996 | 870 | |
8b81ef58 | 871 | static void p9_fd_close(struct p9_client *client) |
bd238fb4 LI |
872 | { |
873 | struct p9_trans_fd *ts; | |
874 | ||
8b81ef58 | 875 | if (!client) |
bd238fb4 LI |
876 | return; |
877 | ||
8b81ef58 | 878 | ts = client->trans; |
bd238fb4 LI |
879 | if (!ts) |
880 | return; | |
881 | ||
8b81ef58 EVH |
882 | client->status = Disconnected; |
883 | ||
8a0dc95f EVH |
884 | p9_conn_destroy(ts->conn); |
885 | ||
bd238fb4 LI |
886 | if (ts->rd) |
887 | fput(ts->rd); | |
888 | if (ts->wr) | |
889 | fput(ts->wr); | |
8b81ef58 | 890 | |
bd238fb4 LI |
891 | kfree(ts); |
892 | } | |
893 | ||
887b3ece EVH |
894 | /* |
895 | * stolen from NFS - maybe should be made a generic function? | |
896 | */ | |
897 | static inline int valid_ipaddr4(const char *buf) | |
898 | { | |
899 | int rc, count, in[4]; | |
900 | ||
901 | rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); | |
902 | if (rc != 4) | |
903 | return -EINVAL; | |
904 | for (count = 0; count < 4; count++) { | |
905 | if (in[count] > 255) | |
906 | return -EINVAL; | |
907 | } | |
908 | return 0; | |
909 | } | |
910 | ||
2f28c8b3 JG |
911 | static int p9_bind_privport(struct socket *sock) |
912 | { | |
913 | struct sockaddr_in cl; | |
914 | int port, err = -EINVAL; | |
915 | ||
916 | memset(&cl, 0, sizeof(cl)); | |
917 | cl.sin_family = AF_INET; | |
918 | cl.sin_addr.s_addr = INADDR_ANY; | |
919 | for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) { | |
920 | cl.sin_port = htons((ushort)port); | |
921 | err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof(cl)); | |
922 | if (err != -EADDRINUSE) | |
923 | break; | |
924 | } | |
925 | return err; | |
926 | } | |
927 | ||
928 | ||
8b81ef58 EVH |
929 | static int |
930 | p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
931 | { |
932 | int err; | |
a80d923e EVH |
933 | struct socket *csocket; |
934 | struct sockaddr_in sin_server; | |
935 | struct p9_fd_opts opts; | |
936 | ||
bb8ffdfc EVH |
937 | err = parse_opts(args, &opts); |
938 | if (err < 0) | |
8b81ef58 | 939 | return err; |
a80d923e | 940 | |
887b3ece | 941 | if (valid_ipaddr4(addr) < 0) |
8b81ef58 | 942 | return -EINVAL; |
887b3ece | 943 | |
a80d923e | 944 | csocket = NULL; |
a80d923e EVH |
945 | |
946 | sin_server.sin_family = AF_INET; | |
947 | sin_server.sin_addr.s_addr = in_aton(addr); | |
948 | sin_server.sin_port = htons(opts.port); | |
e75762fd RL |
949 | err = __sock_create(read_pnet(¤t->nsproxy->net_ns), PF_INET, |
950 | SOCK_STREAM, IPPROTO_TCP, &csocket, 1); | |
6b18662e | 951 | if (err) { |
5d385153 JP |
952 | pr_err("%s (%d): problem creating socket\n", |
953 | __func__, task_pid_nr(current)); | |
6b18662e | 954 | return err; |
a80d923e EVH |
955 | } |
956 | ||
2f28c8b3 JG |
957 | if (opts.privport) { |
958 | err = p9_bind_privport(csocket); | |
959 | if (err < 0) { | |
960 | pr_err("%s (%d): problem binding to privport\n", | |
961 | __func__, task_pid_nr(current)); | |
962 | sock_release(csocket); | |
963 | return err; | |
964 | } | |
965 | } | |
966 | ||
a80d923e EVH |
967 | err = csocket->ops->connect(csocket, |
968 | (struct sockaddr *)&sin_server, | |
969 | sizeof(struct sockaddr_in), 0); | |
970 | if (err < 0) { | |
5d385153 JP |
971 | pr_err("%s (%d): problem connecting socket to %s\n", |
972 | __func__, task_pid_nr(current), addr); | |
a80d923e | 973 | sock_release(csocket); |
6b18662e AV |
974 | return err; |
975 | } | |
a80d923e | 976 | |
6b18662e | 977 | return p9_socket_open(client, csocket); |
a80d923e EVH |
978 | } |
979 | ||
8b81ef58 EVH |
980 | static int |
981 | p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
982 | { |
983 | int err; | |
984 | struct socket *csocket; | |
985 | struct sockaddr_un sun_server; | |
a80d923e EVH |
986 | |
987 | csocket = NULL; | |
a80d923e | 988 | |
cff6b8a9 | 989 | if (strlen(addr) >= UNIX_PATH_MAX) { |
5d385153 JP |
990 | pr_err("%s (%d): address too long: %s\n", |
991 | __func__, task_pid_nr(current), addr); | |
6b18662e | 992 | return -ENAMETOOLONG; |
a80d923e EVH |
993 | } |
994 | ||
995 | sun_server.sun_family = PF_UNIX; | |
996 | strcpy(sun_server.sun_path, addr); | |
e75762fd RL |
997 | err = __sock_create(read_pnet(¤t->nsproxy->net_ns), PF_UNIX, |
998 | SOCK_STREAM, 0, &csocket, 1); | |
6b18662e | 999 | if (err < 0) { |
5d385153 JP |
1000 | pr_err("%s (%d): problem creating socket\n", |
1001 | __func__, task_pid_nr(current)); | |
1002 | ||
6b18662e AV |
1003 | return err; |
1004 | } | |
a80d923e EVH |
1005 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, |
1006 | sizeof(struct sockaddr_un) - 1, 0); | |
1007 | if (err < 0) { | |
5d385153 JP |
1008 | pr_err("%s (%d): problem connecting socket: %s: %d\n", |
1009 | __func__, task_pid_nr(current), addr, err); | |
a80d923e | 1010 | sock_release(csocket); |
6b18662e AV |
1011 | return err; |
1012 | } | |
a80d923e | 1013 | |
6b18662e | 1014 | return p9_socket_open(client, csocket); |
a80d923e EVH |
1015 | } |
1016 | ||
8b81ef58 EVH |
1017 | static int |
1018 | p9_fd_create(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
1019 | { |
1020 | int err; | |
a80d923e | 1021 | struct p9_fd_opts opts; |
6b18662e | 1022 | struct p9_trans_fd *p; |
a80d923e EVH |
1023 | |
1024 | parse_opts(args, &opts); | |
1025 | ||
1026 | if (opts.rfd == ~0 || opts.wfd == ~0) { | |
5d385153 | 1027 | pr_err("Insufficient options for proto=fd\n"); |
8b81ef58 | 1028 | return -ENOPROTOOPT; |
a80d923e EVH |
1029 | } |
1030 | ||
8b81ef58 | 1031 | err = p9_fd_open(client, opts.rfd, opts.wfd); |
a80d923e | 1032 | if (err < 0) |
6b18662e | 1033 | return err; |
a80d923e | 1034 | |
8b81ef58 EVH |
1035 | p = (struct p9_trans_fd *) client->trans; |
1036 | p->conn = p9_conn_create(client); | |
8a0dc95f EVH |
1037 | if (IS_ERR(p->conn)) { |
1038 | err = PTR_ERR(p->conn); | |
1039 | p->conn = NULL; | |
6b18662e AV |
1040 | fput(p->rd); |
1041 | fput(p->wr); | |
1042 | return err; | |
8a0dc95f EVH |
1043 | } |
1044 | ||
8b81ef58 | 1045 | return 0; |
a80d923e EVH |
1046 | } |
1047 | ||
1048 | static struct p9_trans_module p9_tcp_trans = { | |
1049 | .name = "tcp", | |
1050 | .maxsize = MAX_SOCK_BUF, | |
1051 | .def = 1, | |
8b81ef58 EVH |
1052 | .create = p9_fd_create_tcp, |
1053 | .close = p9_fd_close, | |
91b8534f EVH |
1054 | .request = p9_fd_request, |
1055 | .cancel = p9_fd_cancel, | |
72029fe8 | 1056 | .owner = THIS_MODULE, |
a80d923e EVH |
1057 | }; |
1058 | ||
1059 | static struct p9_trans_module p9_unix_trans = { | |
1060 | .name = "unix", | |
1061 | .maxsize = MAX_SOCK_BUF, | |
1062 | .def = 0, | |
8b81ef58 EVH |
1063 | .create = p9_fd_create_unix, |
1064 | .close = p9_fd_close, | |
91b8534f EVH |
1065 | .request = p9_fd_request, |
1066 | .cancel = p9_fd_cancel, | |
72029fe8 | 1067 | .owner = THIS_MODULE, |
a80d923e EVH |
1068 | }; |
1069 | ||
1070 | static struct p9_trans_module p9_fd_trans = { | |
1071 | .name = "fd", | |
1072 | .maxsize = MAX_SOCK_BUF, | |
1073 | .def = 0, | |
8b81ef58 EVH |
1074 | .create = p9_fd_create, |
1075 | .close = p9_fd_close, | |
91b8534f EVH |
1076 | .request = p9_fd_request, |
1077 | .cancel = p9_fd_cancel, | |
72029fe8 | 1078 | .owner = THIS_MODULE, |
a80d923e EVH |
1079 | }; |
1080 | ||
5503ac56 EVH |
1081 | /** |
1082 | * p9_poll_proc - poll worker thread | |
1083 | * @a: thread state and arguments | |
1084 | * | |
1085 | * polls all v9fs transports for new events and queues the appropriate | |
1086 | * work to the work queue | |
1087 | * | |
1088 | */ | |
1089 | ||
aa70c585 | 1090 | static void p9_poll_workfn(struct work_struct *work) |
5503ac56 EVH |
1091 | { |
1092 | unsigned long flags; | |
1093 | ||
5d385153 | 1094 | p9_debug(P9_DEBUG_TRANS, "start %p\n", current); |
aa70c585 | 1095 | |
5503ac56 EVH |
1096 | spin_lock_irqsave(&p9_poll_lock, flags); |
1097 | while (!list_empty(&p9_poll_pending_list)) { | |
1098 | struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, | |
1099 | struct p9_conn, | |
1100 | poll_pending_link); | |
1101 | list_del_init(&conn->poll_pending_link); | |
1102 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1103 | ||
1104 | p9_poll_mux(conn); | |
1105 | ||
1106 | spin_lock_irqsave(&p9_poll_lock, flags); | |
1107 | } | |
1108 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1109 | ||
5d385153 | 1110 | p9_debug(P9_DEBUG_TRANS, "finish\n"); |
5503ac56 EVH |
1111 | } |
1112 | ||
887b3ece | 1113 | int p9_trans_fd_init(void) |
a80d923e EVH |
1114 | { |
1115 | v9fs_register_trans(&p9_tcp_trans); | |
1116 | v9fs_register_trans(&p9_unix_trans); | |
1117 | v9fs_register_trans(&p9_fd_trans); | |
1118 | ||
3387b804 | 1119 | return 0; |
a80d923e | 1120 | } |
72029fe8 TH |
1121 | |
1122 | void p9_trans_fd_exit(void) | |
1123 | { | |
43829731 | 1124 | flush_work(&p9_poll_work); |
72029fe8 TH |
1125 | v9fs_unregister_trans(&p9_tcp_trans); |
1126 | v9fs_unregister_trans(&p9_unix_trans); | |
1127 | v9fs_unregister_trans(&p9_fd_trans); | |
1128 | } |