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 | ||
28 | #include <linux/in.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/net.h> | |
31 | #include <linux/ipv6.h> | |
8a0dc95f | 32 | #include <linux/kthread.h> |
bd238fb4 LI |
33 | #include <linux/errno.h> |
34 | #include <linux/kernel.h> | |
35 | #include <linux/un.h> | |
36 | #include <linux/uaccess.h> | |
37 | #include <linux/inet.h> | |
38 | #include <linux/idr.h> | |
39 | #include <linux/file.h> | |
a80d923e | 40 | #include <linux/parser.h> |
bd238fb4 | 41 | #include <net/9p/9p.h> |
8b81ef58 | 42 | #include <net/9p/client.h> |
bd238fb4 LI |
43 | #include <net/9p/transport.h> |
44 | ||
45 | #define P9_PORT 564 | |
a80d923e | 46 | #define MAX_SOCK_BUF (64*1024) |
8a0dc95f | 47 | #define MAXPOLLWADDR 2 |
a80d923e | 48 | |
ee443996 EVH |
49 | /** |
50 | * struct p9_fd_opts - per-transport options | |
51 | * @rfd: file descriptor for reading (trans=fd) | |
52 | * @wfd: file descriptor for writing (trans=fd) | |
53 | * @port: port to connect to (trans=tcp) | |
54 | * | |
55 | */ | |
56 | ||
a80d923e EVH |
57 | struct p9_fd_opts { |
58 | int rfd; | |
59 | int wfd; | |
60 | u16 port; | |
61 | }; | |
bd238fb4 | 62 | |
ee443996 EVH |
63 | /** |
64 | * struct p9_trans_fd - transport state | |
65 | * @rd: reference to file to read from | |
66 | * @wr: reference of file to write to | |
67 | * @conn: connection state reference | |
68 | * | |
69 | */ | |
70 | ||
bd238fb4 LI |
71 | struct p9_trans_fd { |
72 | struct file *rd; | |
73 | struct file *wr; | |
8a0dc95f | 74 | struct p9_conn *conn; |
bd238fb4 LI |
75 | }; |
76 | ||
a80d923e EVH |
77 | /* |
78 | * Option Parsing (code inspired by NFS code) | |
79 | * - a little lazy - parse all fd-transport options | |
80 | */ | |
bd238fb4 | 81 | |
a80d923e EVH |
82 | enum { |
83 | /* Options that take integer arguments */ | |
55762690 | 84 | Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
a80d923e | 85 | }; |
bd238fb4 | 86 | |
a447c093 | 87 | static const match_table_t tokens = { |
a80d923e EVH |
88 | {Opt_port, "port=%u"}, |
89 | {Opt_rfdno, "rfdno=%u"}, | |
90 | {Opt_wfdno, "wfdno=%u"}, | |
55762690 | 91 | {Opt_err, NULL}, |
a80d923e | 92 | }; |
bd238fb4 | 93 | |
8a0dc95f EVH |
94 | enum { |
95 | Rworksched = 1, /* read work scheduled or running */ | |
96 | Rpending = 2, /* can read */ | |
97 | Wworksched = 4, /* write work scheduled or running */ | |
98 | Wpending = 8, /* can write */ | |
99 | }; | |
100 | ||
992b3f1d TH |
101 | struct p9_poll_wait { |
102 | struct p9_conn *conn; | |
103 | wait_queue_t wait; | |
104 | wait_queue_head_t *wait_addr; | |
ee443996 EVH |
105 | }; |
106 | ||
107 | /** | |
108 | * struct p9_conn - fd mux connection state information | |
ee443996 | 109 | * @mux_list: list link for mux to manage multiple connections (?) |
8b81ef58 | 110 | * @client: reference to client instance for this connection |
ee443996 | 111 | * @err: error state |
ee443996 EVH |
112 | * @req_list: accounting for requests which have been sent |
113 | * @unsent_req_list: accounting for requests that haven't been sent | |
1b0a763b EVH |
114 | * @req: current request being processed (if any) |
115 | * @tmp_buf: temporary buffer to read in header | |
116 | * @rsize: amount to read for current frame | |
ee443996 EVH |
117 | * @rpos: read position in current frame |
118 | * @rbuf: current read buffer | |
119 | * @wpos: write position for current frame | |
120 | * @wsize: amount of data to write for current frame | |
121 | * @wbuf: current write buffer | |
122 | * @poll_wait: array of wait_q's for various worker threads | |
123 | * @poll_waddr: ???? | |
124 | * @pt: poll state | |
125 | * @rq: current read work | |
126 | * @wq: current write work | |
127 | * @wsched: ???? | |
128 | * | |
129 | */ | |
8a0dc95f EVH |
130 | |
131 | struct p9_conn { | |
8a0dc95f | 132 | struct list_head mux_list; |
8b81ef58 | 133 | struct p9_client *client; |
8a0dc95f | 134 | int err; |
8a0dc95f EVH |
135 | struct list_head req_list; |
136 | struct list_head unsent_req_list; | |
1b0a763b EVH |
137 | struct p9_req_t *req; |
138 | char tmp_buf[7]; | |
139 | int rsize; | |
8a0dc95f EVH |
140 | int rpos; |
141 | char *rbuf; | |
142 | int wpos; | |
143 | int wsize; | |
144 | char *wbuf; | |
992b3f1d TH |
145 | struct list_head poll_pending_link; |
146 | struct p9_poll_wait poll_wait[MAXPOLLWADDR]; | |
8a0dc95f EVH |
147 | poll_table pt; |
148 | struct work_struct rq; | |
149 | struct work_struct wq; | |
150 | unsigned long wsched; | |
151 | }; | |
152 | ||
992b3f1d TH |
153 | static DEFINE_SPINLOCK(p9_poll_lock); |
154 | static LIST_HEAD(p9_poll_pending_list); | |
8a0dc95f | 155 | static struct workqueue_struct *p9_mux_wq; |
992b3f1d | 156 | static struct task_struct *p9_poll_task; |
8a0dc95f | 157 | |
992b3f1d | 158 | static void p9_mux_poll_stop(struct p9_conn *m) |
8a0dc95f | 159 | { |
992b3f1d TH |
160 | unsigned long flags; |
161 | int i; | |
8a0dc95f | 162 | |
992b3f1d TH |
163 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
164 | struct p9_poll_wait *pwait = &m->poll_wait[i]; | |
8a0dc95f | 165 | |
992b3f1d TH |
166 | if (pwait->wait_addr) { |
167 | remove_wait_queue(pwait->wait_addr, &pwait->wait); | |
168 | pwait->wait_addr = NULL; | |
8a0dc95f | 169 | } |
8a0dc95f EVH |
170 | } |
171 | ||
992b3f1d TH |
172 | spin_lock_irqsave(&p9_poll_lock, flags); |
173 | list_del_init(&m->poll_pending_link); | |
174 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
8a0dc95f EVH |
175 | } |
176 | ||
177 | /** | |
5503ac56 EVH |
178 | * p9_conn_cancel - cancel all pending requests with error |
179 | * @m: mux data | |
180 | * @err: error code | |
8a0dc95f | 181 | * |
8a0dc95f | 182 | */ |
ee443996 | 183 | |
51a87c55 | 184 | static void p9_conn_cancel(struct p9_conn *m, int err) |
8a0dc95f | 185 | { |
673d62cd | 186 | struct p9_req_t *req, *rtmp; |
91b8534f | 187 | unsigned long flags; |
5503ac56 | 188 | LIST_HEAD(cancel_list); |
8a0dc95f | 189 | |
5503ac56 | 190 | P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); |
7eb923b8 | 191 | |
91b8534f | 192 | spin_lock_irqsave(&m->client->lock, flags); |
7eb923b8 EVH |
193 | |
194 | if (m->err) { | |
195 | spin_unlock_irqrestore(&m->client->lock, flags); | |
196 | return; | |
197 | } | |
198 | ||
199 | m->err = err; | |
200 | ||
5503ac56 | 201 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { |
673d62cd EVH |
202 | req->status = REQ_STATUS_ERROR; |
203 | if (!req->t_err) | |
204 | req->t_err = err; | |
5503ac56 EVH |
205 | list_move(&req->req_list, &cancel_list); |
206 | } | |
207 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { | |
673d62cd EVH |
208 | req->status = REQ_STATUS_ERROR; |
209 | if (!req->t_err) | |
210 | req->t_err = err; | |
5503ac56 | 211 | list_move(&req->req_list, &cancel_list); |
8a0dc95f | 212 | } |
91b8534f | 213 | spin_unlock_irqrestore(&m->client->lock, flags); |
8a0dc95f | 214 | |
5503ac56 | 215 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { |
91b8534f | 216 | P9_DPRINTK(P9_DEBUG_ERROR, "call back req %p\n", req); |
1bab88b2 | 217 | list_del(&req->req_list); |
91b8534f | 218 | p9_client_cb(m->client, req); |
8a0dc95f | 219 | } |
8a0dc95f EVH |
220 | } |
221 | ||
5503ac56 EVH |
222 | static unsigned int |
223 | p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt) | |
8a0dc95f | 224 | { |
5503ac56 EVH |
225 | int ret, n; |
226 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 227 | |
5503ac56 EVH |
228 | if (client && client->status == Connected) |
229 | ts = client->trans; | |
7dc5d24b | 230 | |
5503ac56 EVH |
231 | if (!ts) |
232 | return -EREMOTEIO; | |
7dc5d24b | 233 | |
5503ac56 EVH |
234 | if (!ts->rd->f_op || !ts->rd->f_op->poll) |
235 | return -EIO; | |
8a0dc95f | 236 | |
5503ac56 EVH |
237 | if (!ts->wr->f_op || !ts->wr->f_op->poll) |
238 | return -EIO; | |
992b3f1d | 239 | |
5503ac56 EVH |
240 | ret = ts->rd->f_op->poll(ts->rd, pt); |
241 | if (ret < 0) | |
242 | return ret; | |
992b3f1d | 243 | |
5503ac56 EVH |
244 | if (ts->rd != ts->wr) { |
245 | n = ts->wr->f_op->poll(ts->wr, pt); | |
246 | if (n < 0) | |
247 | return n; | |
248 | ret = (ret & ~POLLOUT) | (n & ~POLLIN); | |
249 | } | |
250 | ||
251 | return ret; | |
992b3f1d TH |
252 | } |
253 | ||
8a0dc95f | 254 | /** |
5503ac56 EVH |
255 | * p9_fd_read- read from a fd |
256 | * @client: client instance | |
257 | * @v: buffer to receive data into | |
258 | * @len: size of receive buffer | |
ee443996 | 259 | * |
8a0dc95f | 260 | */ |
ee443996 | 261 | |
5503ac56 | 262 | static int p9_fd_read(struct p9_client *client, void *v, int len) |
8a0dc95f | 263 | { |
5503ac56 EVH |
264 | int ret; |
265 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 266 | |
5503ac56 EVH |
267 | if (client && client->status != Disconnected) |
268 | ts = client->trans; | |
8a0dc95f | 269 | |
5503ac56 EVH |
270 | if (!ts) |
271 | return -EREMOTEIO; | |
8a0dc95f | 272 | |
5503ac56 EVH |
273 | if (!(ts->rd->f_flags & O_NONBLOCK)) |
274 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n"); | |
8a0dc95f | 275 | |
5503ac56 EVH |
276 | ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); |
277 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
278 | client->status = Disconnected; | |
279 | return ret; | |
8a0dc95f EVH |
280 | } |
281 | ||
282 | /** | |
5503ac56 EVH |
283 | * p9_read_work - called when there is some data to be read from a transport |
284 | * @work: container of work to be done | |
ee443996 | 285 | * |
8a0dc95f | 286 | */ |
ee443996 | 287 | |
5503ac56 | 288 | static void p9_read_work(struct work_struct *work) |
8a0dc95f | 289 | { |
5503ac56 EVH |
290 | int n, err; |
291 | struct p9_conn *m; | |
5503ac56 EVH |
292 | |
293 | m = container_of(work, struct p9_conn, rq); | |
8a0dc95f EVH |
294 | |
295 | if (m->err < 0) | |
296 | return; | |
297 | ||
51a87c55 | 298 | P9_DPRINTK(P9_DEBUG_TRANS, "start mux %p pos %d\n", m, m->rpos); |
8a0dc95f | 299 | |
1b0a763b EVH |
300 | if (!m->rbuf) { |
301 | m->rbuf = m->tmp_buf; | |
5503ac56 | 302 | m->rpos = 0; |
1b0a763b | 303 | m->rsize = 7; /* start by reading header */ |
8a0dc95f EVH |
304 | } |
305 | ||
5503ac56 | 306 | clear_bit(Rpending, &m->wsched); |
51a87c55 | 307 | P9_DPRINTK(P9_DEBUG_TRANS, "read mux %p pos %d size: %d = %d\n", m, |
1b0a763b | 308 | m->rpos, m->rsize, m->rsize-m->rpos); |
5503ac56 | 309 | err = p9_fd_read(m->client, m->rbuf + m->rpos, |
1b0a763b | 310 | m->rsize - m->rpos); |
51a87c55 | 311 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); |
5503ac56 EVH |
312 | if (err == -EAGAIN) { |
313 | clear_bit(Rworksched, &m->wsched); | |
314 | return; | |
8a0dc95f | 315 | } |
8a0dc95f | 316 | |
5503ac56 EVH |
317 | if (err <= 0) |
318 | goto error; | |
319 | ||
320 | m->rpos += err; | |
1b0a763b EVH |
321 | |
322 | if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */ | |
323 | u16 tag; | |
51a87c55 | 324 | P9_DPRINTK(P9_DEBUG_TRANS, "got new header\n"); |
1b0a763b EVH |
325 | |
326 | n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */ | |
5503ac56 EVH |
327 | if (n >= m->client->msize) { |
328 | P9_DPRINTK(P9_DEBUG_ERROR, | |
329 | "requested packet size too big: %d\n", n); | |
330 | err = -EIO; | |
331 | goto error; | |
332 | } | |
333 | ||
1b0a763b | 334 | tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */ |
51a87c55 EVH |
335 | P9_DPRINTK(P9_DEBUG_TRANS, |
336 | "mux %p pkt: size: %d bytes tag: %d\n", m, n, tag); | |
1b0a763b EVH |
337 | |
338 | m->req = p9_tag_lookup(m->client, tag); | |
1bab88b2 LI |
339 | if (!m->req || (m->req->status != REQ_STATUS_SENT && |
340 | m->req->status != REQ_STATUS_FLSH)) { | |
1b0a763b EVH |
341 | P9_DPRINTK(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", |
342 | tag); | |
343 | err = -EIO; | |
344 | goto error; | |
345 | } | |
346 | ||
347 | if (m->req->rc == NULL) { | |
348 | m->req->rc = kmalloc(sizeof(struct p9_fcall) + | |
349 | m->client->msize, GFP_KERNEL); | |
350 | if (!m->req->rc) { | |
351 | m->req = NULL; | |
352 | err = -ENOMEM; | |
353 | goto error; | |
354 | } | |
355 | } | |
356 | m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall); | |
357 | memcpy(m->rbuf, m->tmp_buf, m->rsize); | |
358 | m->rsize = n; | |
359 | } | |
5503ac56 | 360 | |
1b0a763b EVH |
361 | /* not an else because some packets (like clunk) have no payload */ |
362 | if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */ | |
51a87c55 | 363 | P9_DPRINTK(P9_DEBUG_TRANS, "got new packet\n"); |
7eb923b8 | 364 | spin_lock(&m->client->lock); |
1bab88b2 LI |
365 | if (m->req->status != REQ_STATUS_ERROR) |
366 | m->req->status = REQ_STATUS_RCVD; | |
91b8534f | 367 | list_del(&m->req->req_list); |
7eb923b8 | 368 | spin_unlock(&m->client->lock); |
91b8534f | 369 | p9_client_cb(m->client, m->req); |
1b0a763b EVH |
370 | m->rbuf = NULL; |
371 | m->rpos = 0; | |
372 | m->rsize = 0; | |
1b0a763b | 373 | m->req = NULL; |
5503ac56 EVH |
374 | } |
375 | ||
376 | if (!list_empty(&m->req_list)) { | |
377 | if (test_and_clear_bit(Rpending, &m->wsched)) | |
378 | n = POLLIN; | |
379 | else | |
380 | n = p9_fd_poll(m->client, NULL); | |
381 | ||
382 | if (n & POLLIN) { | |
51a87c55 | 383 | P9_DPRINTK(P9_DEBUG_TRANS, "sched read work %p\n", m); |
5503ac56 EVH |
384 | queue_work(p9_mux_wq, &m->rq); |
385 | } else | |
386 | clear_bit(Rworksched, &m->wsched); | |
387 | } else | |
388 | clear_bit(Rworksched, &m->wsched); | |
389 | ||
390 | return; | |
5503ac56 EVH |
391 | error: |
392 | p9_conn_cancel(m, err); | |
393 | clear_bit(Rworksched, &m->wsched); | |
394 | } | |
395 | ||
396 | /** | |
397 | * p9_fd_write - write to a socket | |
398 | * @client: client instance | |
399 | * @v: buffer to send data from | |
400 | * @len: size of send buffer | |
ee443996 | 401 | * |
8a0dc95f | 402 | */ |
ee443996 | 403 | |
5503ac56 | 404 | static int p9_fd_write(struct p9_client *client, void *v, int len) |
8a0dc95f | 405 | { |
5503ac56 EVH |
406 | int ret; |
407 | mm_segment_t oldfs; | |
408 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 409 | |
5503ac56 EVH |
410 | if (client && client->status != Disconnected) |
411 | ts = client->trans; | |
8a0dc95f | 412 | |
5503ac56 EVH |
413 | if (!ts) |
414 | return -EREMOTEIO; | |
8a0dc95f | 415 | |
5503ac56 EVH |
416 | if (!(ts->wr->f_flags & O_NONBLOCK)) |
417 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n"); | |
992b3f1d | 418 | |
5503ac56 EVH |
419 | oldfs = get_fs(); |
420 | set_fs(get_ds()); | |
421 | /* The cast to a user pointer is valid due to the set_fs() */ | |
e3db6cb4 | 422 | ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos); |
5503ac56 | 423 | set_fs(oldfs); |
992b3f1d | 424 | |
5503ac56 EVH |
425 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
426 | client->status = Disconnected; | |
427 | return ret; | |
8a0dc95f EVH |
428 | } |
429 | ||
430 | /** | |
431 | * p9_write_work - called when a transport can send some data | |
ee443996 EVH |
432 | * @work: container for work to be done |
433 | * | |
8a0dc95f | 434 | */ |
ee443996 | 435 | |
8a0dc95f EVH |
436 | static void p9_write_work(struct work_struct *work) |
437 | { | |
438 | int n, err; | |
439 | struct p9_conn *m; | |
673d62cd | 440 | struct p9_req_t *req; |
8a0dc95f EVH |
441 | |
442 | m = container_of(work, struct p9_conn, wq); | |
443 | ||
444 | if (m->err < 0) { | |
445 | clear_bit(Wworksched, &m->wsched); | |
446 | return; | |
447 | } | |
448 | ||
449 | if (!m->wsize) { | |
450 | if (list_empty(&m->unsent_req_list)) { | |
451 | clear_bit(Wworksched, &m->wsched); | |
452 | return; | |
453 | } | |
454 | ||
673d62cd EVH |
455 | spin_lock(&m->client->lock); |
456 | req = list_entry(m->unsent_req_list.next, struct p9_req_t, | |
8a0dc95f | 457 | req_list); |
673d62cd | 458 | req->status = REQ_STATUS_SENT; |
1bab88b2 | 459 | P9_DPRINTK(P9_DEBUG_TRANS, "move req %p\n", req); |
8a0dc95f | 460 | list_move_tail(&req->req_list, &m->req_list); |
8a0dc95f | 461 | |
673d62cd EVH |
462 | m->wbuf = req->tc->sdata; |
463 | m->wsize = req->tc->size; | |
8a0dc95f | 464 | m->wpos = 0; |
673d62cd | 465 | spin_unlock(&m->client->lock); |
8a0dc95f EVH |
466 | } |
467 | ||
51a87c55 | 468 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", m, m->wpos, |
8a0dc95f EVH |
469 | m->wsize); |
470 | clear_bit(Wpending, &m->wsched); | |
8b81ef58 | 471 | err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); |
51a87c55 | 472 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err); |
8a0dc95f EVH |
473 | if (err == -EAGAIN) { |
474 | clear_bit(Wworksched, &m->wsched); | |
475 | return; | |
476 | } | |
477 | ||
478 | if (err < 0) | |
479 | goto error; | |
480 | else if (err == 0) { | |
481 | err = -EREMOTEIO; | |
482 | goto error; | |
483 | } | |
484 | ||
485 | m->wpos += err; | |
486 | if (m->wpos == m->wsize) | |
487 | m->wpos = m->wsize = 0; | |
488 | ||
489 | if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) { | |
490 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
491 | n = POLLOUT; | |
492 | else | |
8b81ef58 | 493 | n = p9_fd_poll(m->client, NULL); |
8a0dc95f EVH |
494 | |
495 | if (n & POLLOUT) { | |
51a87c55 | 496 | P9_DPRINTK(P9_DEBUG_TRANS, "sched write work %p\n", m); |
8a0dc95f EVH |
497 | queue_work(p9_mux_wq, &m->wq); |
498 | } else | |
499 | clear_bit(Wworksched, &m->wsched); | |
500 | } else | |
501 | clear_bit(Wworksched, &m->wsched); | |
502 | ||
503 | return; | |
504 | ||
505 | error: | |
506 | p9_conn_cancel(m, err); | |
507 | clear_bit(Wworksched, &m->wsched); | |
508 | } | |
509 | ||
5503ac56 | 510 | static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key) |
8a0dc95f | 511 | { |
5503ac56 EVH |
512 | struct p9_poll_wait *pwait = |
513 | container_of(wait, struct p9_poll_wait, wait); | |
514 | struct p9_conn *m = pwait->conn; | |
515 | unsigned long flags; | |
516 | DECLARE_WAITQUEUE(dummy_wait, p9_poll_task); | |
8a0dc95f | 517 | |
5503ac56 EVH |
518 | spin_lock_irqsave(&p9_poll_lock, flags); |
519 | if (list_empty(&m->poll_pending_link)) | |
520 | list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); | |
521 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
8a0dc95f | 522 | |
5503ac56 EVH |
523 | /* perform the default wake up operation */ |
524 | return default_wake_function(&dummy_wait, mode, sync, key); | |
8a0dc95f EVH |
525 | } |
526 | ||
527 | /** | |
5503ac56 EVH |
528 | * p9_pollwait - add poll task to the wait queue |
529 | * @filp: file pointer being polled | |
530 | * @wait_address: wait_q to block on | |
531 | * @p: poll state | |
ee443996 | 532 | * |
5503ac56 | 533 | * called by files poll operation to add v9fs-poll task to files wait queue |
8a0dc95f | 534 | */ |
ee443996 | 535 | |
5503ac56 EVH |
536 | static void |
537 | p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) | |
8a0dc95f | 538 | { |
5503ac56 EVH |
539 | struct p9_conn *m = container_of(p, struct p9_conn, pt); |
540 | struct p9_poll_wait *pwait = NULL; | |
541 | int i; | |
8a0dc95f | 542 | |
5503ac56 EVH |
543 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
544 | if (m->poll_wait[i].wait_addr == NULL) { | |
545 | pwait = &m->poll_wait[i]; | |
546 | break; | |
8a0dc95f | 547 | } |
8a0dc95f EVH |
548 | } |
549 | ||
5503ac56 EVH |
550 | if (!pwait) { |
551 | P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n"); | |
8a0dc95f EVH |
552 | return; |
553 | } | |
554 | ||
5503ac56 EVH |
555 | pwait->conn = m; |
556 | pwait->wait_addr = wait_address; | |
557 | init_waitqueue_func_entry(&pwait->wait, p9_pollwake); | |
558 | add_wait_queue(wait_address, &pwait->wait); | |
559 | } | |
8a0dc95f | 560 | |
5503ac56 EVH |
561 | /** |
562 | * p9_conn_create - allocate and initialize the per-session mux data | |
563 | * @client: client instance | |
564 | * | |
565 | * Note: Creates the polling task if this is the first session. | |
566 | */ | |
8a0dc95f | 567 | |
5503ac56 EVH |
568 | static struct p9_conn *p9_conn_create(struct p9_client *client) |
569 | { | |
95820a36 | 570 | int n; |
5503ac56 | 571 | struct p9_conn *m; |
8a0dc95f | 572 | |
51a87c55 EVH |
573 | P9_DPRINTK(P9_DEBUG_TRANS, "client %p msize %d\n", client, |
574 | client->msize); | |
5503ac56 EVH |
575 | m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL); |
576 | if (!m) | |
577 | return ERR_PTR(-ENOMEM); | |
8a0dc95f | 578 | |
5503ac56 EVH |
579 | INIT_LIST_HEAD(&m->mux_list); |
580 | m->client = client; | |
8a0dc95f | 581 | |
5503ac56 EVH |
582 | INIT_LIST_HEAD(&m->req_list); |
583 | INIT_LIST_HEAD(&m->unsent_req_list); | |
584 | INIT_WORK(&m->rq, p9_read_work); | |
585 | INIT_WORK(&m->wq, p9_write_work); | |
586 | INIT_LIST_HEAD(&m->poll_pending_link); | |
587 | init_poll_funcptr(&m->pt, p9_pollwait); | |
8a0dc95f | 588 | |
5503ac56 EVH |
589 | n = p9_fd_poll(client, &m->pt); |
590 | if (n & POLLIN) { | |
51a87c55 | 591 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can read\n", m); |
5503ac56 EVH |
592 | set_bit(Rpending, &m->wsched); |
593 | } | |
8a0dc95f | 594 | |
5503ac56 | 595 | if (n & POLLOUT) { |
51a87c55 | 596 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can write\n", m); |
5503ac56 EVH |
597 | set_bit(Wpending, &m->wsched); |
598 | } | |
599 | ||
5503ac56 EVH |
600 | return m; |
601 | } | |
8a0dc95f | 602 | |
5503ac56 EVH |
603 | /** |
604 | * p9_poll_mux - polls a mux and schedules read or write works if necessary | |
605 | * @m: connection to poll | |
606 | * | |
607 | */ | |
608 | ||
609 | static void p9_poll_mux(struct p9_conn *m) | |
610 | { | |
611 | int n; | |
612 | ||
613 | if (m->err < 0) | |
614 | return; | |
615 | ||
616 | n = p9_fd_poll(m->client, NULL); | |
617 | if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { | |
51a87c55 | 618 | P9_DPRINTK(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n); |
5503ac56 EVH |
619 | if (n >= 0) |
620 | n = -ECONNRESET; | |
621 | p9_conn_cancel(m, n); | |
622 | } | |
623 | ||
624 | if (n & POLLIN) { | |
625 | set_bit(Rpending, &m->wsched); | |
51a87c55 | 626 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can read\n", m); |
5503ac56 | 627 | if (!test_and_set_bit(Rworksched, &m->wsched)) { |
51a87c55 | 628 | P9_DPRINTK(P9_DEBUG_TRANS, "sched read work %p\n", m); |
8a0dc95f | 629 | queue_work(p9_mux_wq, &m->rq); |
5503ac56 EVH |
630 | } |
631 | } | |
8a0dc95f | 632 | |
5503ac56 EVH |
633 | if (n & POLLOUT) { |
634 | set_bit(Wpending, &m->wsched); | |
51a87c55 | 635 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can write\n", m); |
5503ac56 EVH |
636 | if ((m->wsize || !list_empty(&m->unsent_req_list)) |
637 | && !test_and_set_bit(Wworksched, &m->wsched)) { | |
51a87c55 | 638 | P9_DPRINTK(P9_DEBUG_TRANS, "sched write work %p\n", m); |
5503ac56 EVH |
639 | queue_work(p9_mux_wq, &m->wq); |
640 | } | |
641 | } | |
8a0dc95f EVH |
642 | } |
643 | ||
644 | /** | |
91b8534f | 645 | * p9_fd_request - send 9P request |
8a0dc95f EVH |
646 | * The function can sleep until the request is scheduled for sending. |
647 | * The function can be interrupted. Return from the function is not | |
91b8534f | 648 | * a guarantee that the request is sent successfully. |
8a0dc95f | 649 | * |
91b8534f EVH |
650 | * @client: client instance |
651 | * @req: request to be sent | |
ee443996 | 652 | * |
8a0dc95f | 653 | */ |
ee443996 | 654 | |
91b8534f | 655 | static int p9_fd_request(struct p9_client *client, struct p9_req_t *req) |
8a0dc95f EVH |
656 | { |
657 | int n; | |
91b8534f EVH |
658 | struct p9_trans_fd *ts = client->trans; |
659 | struct p9_conn *m = ts->conn; | |
8a0dc95f | 660 | |
51a87c55 EVH |
661 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", m, |
662 | current, req->tc, req->tc->id); | |
8a0dc95f | 663 | if (m->err < 0) |
91b8534f | 664 | return m->err; |
8a0dc95f | 665 | |
91b8534f | 666 | spin_lock(&client->lock); |
7eb923b8 | 667 | req->status = REQ_STATUS_UNSENT; |
8a0dc95f | 668 | list_add_tail(&req->req_list, &m->unsent_req_list); |
91b8534f | 669 | spin_unlock(&client->lock); |
8a0dc95f EVH |
670 | |
671 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
672 | n = POLLOUT; | |
673 | else | |
8b81ef58 | 674 | n = p9_fd_poll(m->client, NULL); |
8a0dc95f EVH |
675 | |
676 | if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) | |
677 | queue_work(p9_mux_wq, &m->wq); | |
678 | ||
91b8534f | 679 | return 0; |
8a0dc95f EVH |
680 | } |
681 | ||
91b8534f | 682 | static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req) |
8a0dc95f | 683 | { |
7eb923b8 | 684 | int ret = 1; |
8a0dc95f | 685 | |
0b15a3a5 | 686 | P9_DPRINTK(P9_DEBUG_TRANS, "client %p req %p\n", client, req); |
8a0dc95f | 687 | |
91b8534f | 688 | spin_lock(&client->lock); |
91b8534f | 689 | |
91b8534f | 690 | if (req->status == REQ_STATUS_UNSENT) { |
1bab88b2 | 691 | list_del(&req->req_list); |
91b8534f | 692 | req->status = REQ_STATUS_FLSHD; |
7eb923b8 | 693 | ret = 0; |
1bab88b2 LI |
694 | } else if (req->status == REQ_STATUS_SENT) |
695 | req->status = REQ_STATUS_FLSH; | |
8a0dc95f | 696 | |
7eb923b8 EVH |
697 | spin_unlock(&client->lock); |
698 | ||
699 | return ret; | |
8a0dc95f EVH |
700 | } |
701 | ||
a80d923e | 702 | /** |
bb8ffdfc | 703 | * parse_options - parse mount options into session structure |
a80d923e | 704 | * @options: options string passed from mount |
ee443996 | 705 | * @opts: transport-specific structure to parse options into |
a80d923e | 706 | * |
bb8ffdfc | 707 | * Returns 0 upon success, -ERRNO upon failure |
a80d923e | 708 | */ |
bd238fb4 | 709 | |
bb8ffdfc | 710 | static int parse_opts(char *params, struct p9_fd_opts *opts) |
bd238fb4 | 711 | { |
a80d923e EVH |
712 | char *p; |
713 | substring_t args[MAX_OPT_ARGS]; | |
714 | int option; | |
bb8ffdfc | 715 | char *options; |
a80d923e | 716 | int ret; |
bd238fb4 | 717 | |
a80d923e EVH |
718 | opts->port = P9_PORT; |
719 | opts->rfd = ~0; | |
720 | opts->wfd = ~0; | |
bd238fb4 | 721 | |
bb8ffdfc EVH |
722 | if (!params) |
723 | return 0; | |
724 | ||
725 | options = kstrdup(params, GFP_KERNEL); | |
726 | if (!options) { | |
727 | P9_DPRINTK(P9_DEBUG_ERROR, | |
728 | "failed to allocate copy of option string\n"); | |
729 | return -ENOMEM; | |
730 | } | |
bd238fb4 | 731 | |
a80d923e EVH |
732 | while ((p = strsep(&options, ",")) != NULL) { |
733 | int token; | |
bb8ffdfc | 734 | int r; |
a80d923e EVH |
735 | if (!*p) |
736 | continue; | |
737 | token = match_token(p, tokens, args); | |
bb8ffdfc EVH |
738 | r = match_int(&args[0], &option); |
739 | if (r < 0) { | |
a80d923e EVH |
740 | P9_DPRINTK(P9_DEBUG_ERROR, |
741 | "integer field, but no integer?\n"); | |
bb8ffdfc | 742 | ret = r; |
a80d923e EVH |
743 | continue; |
744 | } | |
745 | switch (token) { | |
746 | case Opt_port: | |
747 | opts->port = option; | |
748 | break; | |
749 | case Opt_rfdno: | |
750 | opts->rfd = option; | |
751 | break; | |
752 | case Opt_wfdno: | |
753 | opts->wfd = option; | |
754 | break; | |
755 | default: | |
756 | continue; | |
757 | } | |
bd238fb4 | 758 | } |
bb8ffdfc EVH |
759 | kfree(options); |
760 | return 0; | |
bd238fb4 | 761 | } |
bd238fb4 | 762 | |
8b81ef58 | 763 | static int p9_fd_open(struct p9_client *client, int rfd, int wfd) |
bd238fb4 | 764 | { |
a80d923e EVH |
765 | struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), |
766 | GFP_KERNEL); | |
767 | if (!ts) | |
768 | return -ENOMEM; | |
bd238fb4 | 769 | |
a80d923e EVH |
770 | ts->rd = fget(rfd); |
771 | ts->wr = fget(wfd); | |
772 | if (!ts->rd || !ts->wr) { | |
773 | if (ts->rd) | |
774 | fput(ts->rd); | |
775 | if (ts->wr) | |
776 | fput(ts->wr); | |
777 | kfree(ts); | |
778 | return -EIO; | |
bd238fb4 LI |
779 | } |
780 | ||
8b81ef58 EVH |
781 | client->trans = ts; |
782 | client->status = Connected; | |
bd238fb4 | 783 | |
a80d923e | 784 | return 0; |
bd238fb4 | 785 | } |
bd238fb4 | 786 | |
8b81ef58 | 787 | static int p9_socket_open(struct p9_client *client, struct socket *csocket) |
bd238fb4 LI |
788 | { |
789 | int fd, ret; | |
790 | ||
791 | csocket->sk->sk_allocation = GFP_NOIO; | |
a677a039 | 792 | fd = sock_map_fd(csocket, 0); |
bd238fb4 LI |
793 | if (fd < 0) { |
794 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n"); | |
795 | return fd; | |
796 | } | |
797 | ||
8b81ef58 | 798 | ret = p9_fd_open(client, fd, fd); |
bd238fb4 LI |
799 | if (ret < 0) { |
800 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n"); | |
801 | sockfd_put(csocket); | |
802 | return ret; | |
803 | } | |
804 | ||
8b81ef58 | 805 | ((struct p9_trans_fd *)client->trans)->rd->f_flags |= O_NONBLOCK; |
bd238fb4 LI |
806 | |
807 | return 0; | |
808 | } | |
809 | ||
bd238fb4 | 810 | /** |
5503ac56 EVH |
811 | * p9_mux_destroy - cancels all pending requests and frees mux resources |
812 | * @m: mux to destroy | |
bd238fb4 LI |
813 | * |
814 | */ | |
ee443996 | 815 | |
5503ac56 | 816 | static void p9_conn_destroy(struct p9_conn *m) |
bd238fb4 | 817 | { |
51a87c55 | 818 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", m, |
5503ac56 | 819 | m->mux_list.prev, m->mux_list.next); |
bd238fb4 | 820 | |
5503ac56 EVH |
821 | p9_mux_poll_stop(m); |
822 | cancel_work_sync(&m->rq); | |
823 | cancel_work_sync(&m->wq); | |
bd238fb4 | 824 | |
5503ac56 | 825 | p9_conn_cancel(m, -ECONNRESET); |
bd238fb4 | 826 | |
5503ac56 | 827 | m->client = NULL; |
5503ac56 | 828 | kfree(m); |
bd238fb4 LI |
829 | } |
830 | ||
831 | /** | |
8b81ef58 EVH |
832 | * p9_fd_close - shutdown file descriptor transport |
833 | * @client: client instance | |
bd238fb4 LI |
834 | * |
835 | */ | |
ee443996 | 836 | |
8b81ef58 | 837 | static void p9_fd_close(struct p9_client *client) |
bd238fb4 LI |
838 | { |
839 | struct p9_trans_fd *ts; | |
840 | ||
8b81ef58 | 841 | if (!client) |
bd238fb4 LI |
842 | return; |
843 | ||
8b81ef58 | 844 | ts = client->trans; |
bd238fb4 LI |
845 | if (!ts) |
846 | return; | |
847 | ||
8b81ef58 EVH |
848 | client->status = Disconnected; |
849 | ||
8a0dc95f EVH |
850 | p9_conn_destroy(ts->conn); |
851 | ||
bd238fb4 LI |
852 | if (ts->rd) |
853 | fput(ts->rd); | |
854 | if (ts->wr) | |
855 | fput(ts->wr); | |
8b81ef58 | 856 | |
bd238fb4 LI |
857 | kfree(ts); |
858 | } | |
859 | ||
887b3ece EVH |
860 | /* |
861 | * stolen from NFS - maybe should be made a generic function? | |
862 | */ | |
863 | static inline int valid_ipaddr4(const char *buf) | |
864 | { | |
865 | int rc, count, in[4]; | |
866 | ||
867 | rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); | |
868 | if (rc != 4) | |
869 | return -EINVAL; | |
870 | for (count = 0; count < 4; count++) { | |
871 | if (in[count] > 255) | |
872 | return -EINVAL; | |
873 | } | |
874 | return 0; | |
875 | } | |
876 | ||
8b81ef58 EVH |
877 | static int |
878 | p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
879 | { |
880 | int err; | |
a80d923e EVH |
881 | struct socket *csocket; |
882 | struct sockaddr_in sin_server; | |
883 | struct p9_fd_opts opts; | |
8b81ef58 | 884 | struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */ |
a80d923e | 885 | |
bb8ffdfc EVH |
886 | err = parse_opts(args, &opts); |
887 | if (err < 0) | |
8b81ef58 | 888 | return err; |
a80d923e | 889 | |
887b3ece | 890 | if (valid_ipaddr4(addr) < 0) |
8b81ef58 | 891 | return -EINVAL; |
887b3ece | 892 | |
a80d923e | 893 | csocket = NULL; |
a80d923e EVH |
894 | |
895 | sin_server.sin_family = AF_INET; | |
896 | sin_server.sin_addr.s_addr = in_aton(addr); | |
897 | sin_server.sin_port = htons(opts.port); | |
898 | sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket); | |
899 | ||
900 | if (!csocket) { | |
901 | P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n"); | |
902 | err = -EIO; | |
903 | goto error; | |
904 | } | |
905 | ||
906 | err = csocket->ops->connect(csocket, | |
907 | (struct sockaddr *)&sin_server, | |
908 | sizeof(struct sockaddr_in), 0); | |
909 | if (err < 0) { | |
910 | P9_EPRINTK(KERN_ERR, | |
911 | "p9_trans_tcp: problem connecting socket to %s\n", | |
912 | addr); | |
913 | goto error; | |
914 | } | |
915 | ||
8b81ef58 | 916 | err = p9_socket_open(client, csocket); |
a80d923e EVH |
917 | if (err < 0) |
918 | goto error; | |
919 | ||
8b81ef58 EVH |
920 | p = (struct p9_trans_fd *) client->trans; |
921 | p->conn = p9_conn_create(client); | |
8a0dc95f EVH |
922 | if (IS_ERR(p->conn)) { |
923 | err = PTR_ERR(p->conn); | |
924 | p->conn = NULL; | |
925 | goto error; | |
926 | } | |
927 | ||
8b81ef58 | 928 | return 0; |
a80d923e EVH |
929 | |
930 | error: | |
931 | if (csocket) | |
932 | sock_release(csocket); | |
933 | ||
8b81ef58 EVH |
934 | kfree(p); |
935 | ||
936 | return err; | |
a80d923e EVH |
937 | } |
938 | ||
8b81ef58 EVH |
939 | static int |
940 | p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
941 | { |
942 | int err; | |
943 | struct socket *csocket; | |
944 | struct sockaddr_un sun_server; | |
8b81ef58 | 945 | struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */ |
a80d923e EVH |
946 | |
947 | csocket = NULL; | |
a80d923e EVH |
948 | |
949 | if (strlen(addr) > UNIX_PATH_MAX) { | |
950 | P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n", | |
951 | addr); | |
952 | err = -ENAMETOOLONG; | |
953 | goto error; | |
954 | } | |
955 | ||
956 | sun_server.sun_family = PF_UNIX; | |
957 | strcpy(sun_server.sun_path, addr); | |
958 | sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket); | |
959 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, | |
960 | sizeof(struct sockaddr_un) - 1, 0); | |
961 | if (err < 0) { | |
962 | P9_EPRINTK(KERN_ERR, | |
963 | "p9_trans_unix: problem connecting socket: %s: %d\n", | |
964 | addr, err); | |
965 | goto error; | |
966 | } | |
967 | ||
8b81ef58 | 968 | err = p9_socket_open(client, csocket); |
a80d923e EVH |
969 | if (err < 0) |
970 | goto error; | |
971 | ||
8b81ef58 EVH |
972 | p = (struct p9_trans_fd *) client->trans; |
973 | p->conn = p9_conn_create(client); | |
8a0dc95f EVH |
974 | if (IS_ERR(p->conn)) { |
975 | err = PTR_ERR(p->conn); | |
976 | p->conn = NULL; | |
977 | goto error; | |
978 | } | |
979 | ||
8b81ef58 | 980 | return 0; |
a80d923e EVH |
981 | |
982 | error: | |
983 | if (csocket) | |
984 | sock_release(csocket); | |
985 | ||
8b81ef58 EVH |
986 | kfree(p); |
987 | return err; | |
a80d923e EVH |
988 | } |
989 | ||
8b81ef58 EVH |
990 | static int |
991 | p9_fd_create(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
992 | { |
993 | int err; | |
a80d923e | 994 | struct p9_fd_opts opts; |
8b81ef58 | 995 | struct p9_trans_fd *p = NULL; /* this get allocated in p9_fd_open */ |
a80d923e EVH |
996 | |
997 | parse_opts(args, &opts); | |
998 | ||
999 | if (opts.rfd == ~0 || opts.wfd == ~0) { | |
1000 | printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); | |
8b81ef58 | 1001 | return -ENOPROTOOPT; |
a80d923e EVH |
1002 | } |
1003 | ||
8b81ef58 | 1004 | err = p9_fd_open(client, opts.rfd, opts.wfd); |
a80d923e EVH |
1005 | if (err < 0) |
1006 | goto error; | |
1007 | ||
8b81ef58 EVH |
1008 | p = (struct p9_trans_fd *) client->trans; |
1009 | p->conn = p9_conn_create(client); | |
8a0dc95f EVH |
1010 | if (IS_ERR(p->conn)) { |
1011 | err = PTR_ERR(p->conn); | |
1012 | p->conn = NULL; | |
1013 | goto error; | |
1014 | } | |
1015 | ||
8b81ef58 | 1016 | return 0; |
a80d923e EVH |
1017 | |
1018 | error: | |
8b81ef58 EVH |
1019 | kfree(p); |
1020 | return err; | |
a80d923e EVH |
1021 | } |
1022 | ||
1023 | static struct p9_trans_module p9_tcp_trans = { | |
1024 | .name = "tcp", | |
1025 | .maxsize = MAX_SOCK_BUF, | |
1026 | .def = 1, | |
8b81ef58 EVH |
1027 | .create = p9_fd_create_tcp, |
1028 | .close = p9_fd_close, | |
91b8534f EVH |
1029 | .request = p9_fd_request, |
1030 | .cancel = p9_fd_cancel, | |
72029fe8 | 1031 | .owner = THIS_MODULE, |
a80d923e EVH |
1032 | }; |
1033 | ||
1034 | static struct p9_trans_module p9_unix_trans = { | |
1035 | .name = "unix", | |
1036 | .maxsize = MAX_SOCK_BUF, | |
1037 | .def = 0, | |
8b81ef58 EVH |
1038 | .create = p9_fd_create_unix, |
1039 | .close = p9_fd_close, | |
91b8534f EVH |
1040 | .request = p9_fd_request, |
1041 | .cancel = p9_fd_cancel, | |
72029fe8 | 1042 | .owner = THIS_MODULE, |
a80d923e EVH |
1043 | }; |
1044 | ||
1045 | static struct p9_trans_module p9_fd_trans = { | |
1046 | .name = "fd", | |
1047 | .maxsize = MAX_SOCK_BUF, | |
1048 | .def = 0, | |
8b81ef58 EVH |
1049 | .create = p9_fd_create, |
1050 | .close = p9_fd_close, | |
91b8534f EVH |
1051 | .request = p9_fd_request, |
1052 | .cancel = p9_fd_cancel, | |
72029fe8 | 1053 | .owner = THIS_MODULE, |
a80d923e EVH |
1054 | }; |
1055 | ||
5503ac56 EVH |
1056 | /** |
1057 | * p9_poll_proc - poll worker thread | |
1058 | * @a: thread state and arguments | |
1059 | * | |
1060 | * polls all v9fs transports for new events and queues the appropriate | |
1061 | * work to the work queue | |
1062 | * | |
1063 | */ | |
1064 | ||
1065 | static int p9_poll_proc(void *a) | |
1066 | { | |
1067 | unsigned long flags; | |
1068 | ||
51a87c55 | 1069 | P9_DPRINTK(P9_DEBUG_TRANS, "start %p\n", current); |
5503ac56 EVH |
1070 | repeat: |
1071 | spin_lock_irqsave(&p9_poll_lock, flags); | |
1072 | while (!list_empty(&p9_poll_pending_list)) { | |
1073 | struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, | |
1074 | struct p9_conn, | |
1075 | poll_pending_link); | |
1076 | list_del_init(&conn->poll_pending_link); | |
1077 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1078 | ||
1079 | p9_poll_mux(conn); | |
1080 | ||
1081 | spin_lock_irqsave(&p9_poll_lock, flags); | |
1082 | } | |
1083 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1084 | ||
1085 | set_current_state(TASK_INTERRUPTIBLE); | |
1086 | if (list_empty(&p9_poll_pending_list)) { | |
51a87c55 | 1087 | P9_DPRINTK(P9_DEBUG_TRANS, "sleeping...\n"); |
5503ac56 EVH |
1088 | schedule(); |
1089 | } | |
1090 | __set_current_state(TASK_RUNNING); | |
1091 | ||
1092 | if (!kthread_should_stop()) | |
1093 | goto repeat; | |
1094 | ||
51a87c55 | 1095 | P9_DPRINTK(P9_DEBUG_TRANS, "finish\n"); |
5503ac56 EVH |
1096 | return 0; |
1097 | } | |
1098 | ||
887b3ece | 1099 | int p9_trans_fd_init(void) |
a80d923e | 1100 | { |
206ca50d TH |
1101 | p9_mux_wq = create_workqueue("v9fs"); |
1102 | if (!p9_mux_wq) { | |
1103 | printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n"); | |
1104 | return -ENOMEM; | |
8a0dc95f EVH |
1105 | } |
1106 | ||
992b3f1d TH |
1107 | p9_poll_task = kthread_run(p9_poll_proc, NULL, "v9fs-poll"); |
1108 | if (IS_ERR(p9_poll_task)) { | |
1109 | destroy_workqueue(p9_mux_wq); | |
1110 | printk(KERN_WARNING "v9fs: mux: creating poll task failed\n"); | |
1111 | return PTR_ERR(p9_poll_task); | |
1112 | } | |
1113 | ||
a80d923e EVH |
1114 | v9fs_register_trans(&p9_tcp_trans); |
1115 | v9fs_register_trans(&p9_unix_trans); | |
1116 | v9fs_register_trans(&p9_fd_trans); | |
1117 | ||
3387b804 | 1118 | return 0; |
a80d923e | 1119 | } |
72029fe8 TH |
1120 | |
1121 | void p9_trans_fd_exit(void) | |
1122 | { | |
992b3f1d | 1123 | kthread_stop(p9_poll_task); |
72029fe8 TH |
1124 | v9fs_unregister_trans(&p9_tcp_trans); |
1125 | v9fs_unregister_trans(&p9_unix_trans); | |
1126 | v9fs_unregister_trans(&p9_fd_trans); | |
206ca50d TH |
1127 | |
1128 | destroy_workqueue(p9_mux_wq); | |
72029fe8 | 1129 | } |