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 | ||
6b18662e AV |
45 | #include <linux/syscalls.h> /* killme */ |
46 | ||
bd238fb4 | 47 | #define P9_PORT 564 |
a80d923e | 48 | #define MAX_SOCK_BUF (64*1024) |
8a0dc95f | 49 | #define MAXPOLLWADDR 2 |
a80d923e | 50 | |
ee443996 EVH |
51 | /** |
52 | * struct p9_fd_opts - per-transport options | |
53 | * @rfd: file descriptor for reading (trans=fd) | |
54 | * @wfd: file descriptor for writing (trans=fd) | |
55 | * @port: port to connect to (trans=tcp) | |
56 | * | |
57 | */ | |
58 | ||
a80d923e EVH |
59 | struct p9_fd_opts { |
60 | int rfd; | |
61 | int wfd; | |
62 | u16 port; | |
63 | }; | |
bd238fb4 | 64 | |
ee443996 EVH |
65 | /** |
66 | * struct p9_trans_fd - transport state | |
67 | * @rd: reference to file to read from | |
68 | * @wr: reference of file to write to | |
69 | * @conn: connection state reference | |
70 | * | |
71 | */ | |
72 | ||
bd238fb4 LI |
73 | struct p9_trans_fd { |
74 | struct file *rd; | |
75 | struct file *wr; | |
8a0dc95f | 76 | struct p9_conn *conn; |
bd238fb4 LI |
77 | }; |
78 | ||
a80d923e EVH |
79 | /* |
80 | * Option Parsing (code inspired by NFS code) | |
81 | * - a little lazy - parse all fd-transport options | |
82 | */ | |
bd238fb4 | 83 | |
a80d923e EVH |
84 | enum { |
85 | /* Options that take integer arguments */ | |
55762690 | 86 | Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
a80d923e | 87 | }; |
bd238fb4 | 88 | |
a447c093 | 89 | static const match_table_t tokens = { |
a80d923e EVH |
90 | {Opt_port, "port=%u"}, |
91 | {Opt_rfdno, "rfdno=%u"}, | |
92 | {Opt_wfdno, "wfdno=%u"}, | |
55762690 | 93 | {Opt_err, NULL}, |
a80d923e | 94 | }; |
bd238fb4 | 95 | |
8a0dc95f EVH |
96 | enum { |
97 | Rworksched = 1, /* read work scheduled or running */ | |
98 | Rpending = 2, /* can read */ | |
99 | Wworksched = 4, /* write work scheduled or running */ | |
100 | Wpending = 8, /* can write */ | |
101 | }; | |
102 | ||
992b3f1d TH |
103 | struct p9_poll_wait { |
104 | struct p9_conn *conn; | |
105 | wait_queue_t wait; | |
106 | wait_queue_head_t *wait_addr; | |
ee443996 EVH |
107 | }; |
108 | ||
109 | /** | |
110 | * struct p9_conn - fd mux connection state information | |
ee443996 | 111 | * @mux_list: list link for mux to manage multiple connections (?) |
8b81ef58 | 112 | * @client: reference to client instance for this connection |
ee443996 | 113 | * @err: error state |
ee443996 EVH |
114 | * @req_list: accounting for requests which have been sent |
115 | * @unsent_req_list: accounting for requests that haven't been sent | |
1b0a763b EVH |
116 | * @req: current request being processed (if any) |
117 | * @tmp_buf: temporary buffer to read in header | |
118 | * @rsize: amount to read for current frame | |
ee443996 EVH |
119 | * @rpos: read position in current frame |
120 | * @rbuf: current read buffer | |
121 | * @wpos: write position for current frame | |
122 | * @wsize: amount of data to write for current frame | |
123 | * @wbuf: current write buffer | |
0e15597e | 124 | * @poll_pending_link: pending links to be polled per conn |
ee443996 | 125 | * @poll_wait: array of wait_q's for various worker threads |
ee443996 EVH |
126 | * @pt: poll state |
127 | * @rq: current read work | |
128 | * @wq: current write work | |
129 | * @wsched: ???? | |
130 | * | |
131 | */ | |
8a0dc95f EVH |
132 | |
133 | struct p9_conn { | |
8a0dc95f | 134 | struct list_head mux_list; |
8b81ef58 | 135 | struct p9_client *client; |
8a0dc95f | 136 | int err; |
8a0dc95f EVH |
137 | struct list_head req_list; |
138 | struct list_head unsent_req_list; | |
1b0a763b EVH |
139 | struct p9_req_t *req; |
140 | char tmp_buf[7]; | |
141 | int rsize; | |
8a0dc95f EVH |
142 | int rpos; |
143 | char *rbuf; | |
144 | int wpos; | |
145 | int wsize; | |
146 | char *wbuf; | |
992b3f1d TH |
147 | struct list_head poll_pending_link; |
148 | struct p9_poll_wait poll_wait[MAXPOLLWADDR]; | |
8a0dc95f EVH |
149 | poll_table pt; |
150 | struct work_struct rq; | |
151 | struct work_struct wq; | |
152 | unsigned long wsched; | |
153 | }; | |
154 | ||
992b3f1d TH |
155 | static DEFINE_SPINLOCK(p9_poll_lock); |
156 | static LIST_HEAD(p9_poll_pending_list); | |
8a0dc95f | 157 | static struct workqueue_struct *p9_mux_wq; |
992b3f1d | 158 | static struct task_struct *p9_poll_task; |
8a0dc95f | 159 | |
992b3f1d | 160 | static void p9_mux_poll_stop(struct p9_conn *m) |
8a0dc95f | 161 | { |
992b3f1d TH |
162 | unsigned long flags; |
163 | int i; | |
8a0dc95f | 164 | |
992b3f1d TH |
165 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
166 | struct p9_poll_wait *pwait = &m->poll_wait[i]; | |
8a0dc95f | 167 | |
992b3f1d TH |
168 | if (pwait->wait_addr) { |
169 | remove_wait_queue(pwait->wait_addr, &pwait->wait); | |
170 | pwait->wait_addr = NULL; | |
8a0dc95f | 171 | } |
8a0dc95f EVH |
172 | } |
173 | ||
992b3f1d TH |
174 | spin_lock_irqsave(&p9_poll_lock, flags); |
175 | list_del_init(&m->poll_pending_link); | |
176 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
8a0dc95f EVH |
177 | } |
178 | ||
179 | /** | |
5503ac56 EVH |
180 | * p9_conn_cancel - cancel all pending requests with error |
181 | * @m: mux data | |
182 | * @err: error code | |
8a0dc95f | 183 | * |
8a0dc95f | 184 | */ |
ee443996 | 185 | |
51a87c55 | 186 | static void p9_conn_cancel(struct p9_conn *m, int err) |
8a0dc95f | 187 | { |
673d62cd | 188 | struct p9_req_t *req, *rtmp; |
91b8534f | 189 | unsigned long flags; |
5503ac56 | 190 | LIST_HEAD(cancel_list); |
8a0dc95f | 191 | |
5503ac56 | 192 | P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); |
7eb923b8 | 193 | |
91b8534f | 194 | spin_lock_irqsave(&m->client->lock, flags); |
7eb923b8 EVH |
195 | |
196 | if (m->err) { | |
197 | spin_unlock_irqrestore(&m->client->lock, flags); | |
198 | return; | |
199 | } | |
200 | ||
201 | m->err = err; | |
202 | ||
5503ac56 | 203 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { |
673d62cd EVH |
204 | req->status = REQ_STATUS_ERROR; |
205 | if (!req->t_err) | |
206 | req->t_err = err; | |
5503ac56 EVH |
207 | list_move(&req->req_list, &cancel_list); |
208 | } | |
209 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { | |
673d62cd EVH |
210 | req->status = REQ_STATUS_ERROR; |
211 | if (!req->t_err) | |
212 | req->t_err = err; | |
5503ac56 | 213 | list_move(&req->req_list, &cancel_list); |
8a0dc95f | 214 | } |
91b8534f | 215 | spin_unlock_irqrestore(&m->client->lock, flags); |
8a0dc95f | 216 | |
5503ac56 | 217 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { |
91b8534f | 218 | P9_DPRINTK(P9_DEBUG_ERROR, "call back req %p\n", req); |
1bab88b2 | 219 | list_del(&req->req_list); |
91b8534f | 220 | p9_client_cb(m->client, req); |
8a0dc95f | 221 | } |
8a0dc95f EVH |
222 | } |
223 | ||
5503ac56 EVH |
224 | static unsigned int |
225 | p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt) | |
8a0dc95f | 226 | { |
5503ac56 EVH |
227 | int ret, n; |
228 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 229 | |
5503ac56 EVH |
230 | if (client && client->status == Connected) |
231 | ts = client->trans; | |
7dc5d24b | 232 | |
5503ac56 EVH |
233 | if (!ts) |
234 | return -EREMOTEIO; | |
7dc5d24b | 235 | |
5503ac56 EVH |
236 | if (!ts->rd->f_op || !ts->rd->f_op->poll) |
237 | return -EIO; | |
8a0dc95f | 238 | |
5503ac56 EVH |
239 | if (!ts->wr->f_op || !ts->wr->f_op->poll) |
240 | return -EIO; | |
992b3f1d | 241 | |
5503ac56 EVH |
242 | ret = ts->rd->f_op->poll(ts->rd, pt); |
243 | if (ret < 0) | |
244 | return ret; | |
992b3f1d | 245 | |
5503ac56 EVH |
246 | if (ts->rd != ts->wr) { |
247 | n = ts->wr->f_op->poll(ts->wr, pt); | |
248 | if (n < 0) | |
249 | return n; | |
250 | ret = (ret & ~POLLOUT) | (n & ~POLLIN); | |
251 | } | |
252 | ||
253 | return ret; | |
992b3f1d TH |
254 | } |
255 | ||
8a0dc95f | 256 | /** |
5503ac56 EVH |
257 | * p9_fd_read- read from a fd |
258 | * @client: client instance | |
259 | * @v: buffer to receive data into | |
260 | * @len: size of receive buffer | |
ee443996 | 261 | * |
8a0dc95f | 262 | */ |
ee443996 | 263 | |
5503ac56 | 264 | static int p9_fd_read(struct p9_client *client, void *v, int len) |
8a0dc95f | 265 | { |
5503ac56 EVH |
266 | int ret; |
267 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 268 | |
5503ac56 EVH |
269 | if (client && client->status != Disconnected) |
270 | ts = client->trans; | |
8a0dc95f | 271 | |
5503ac56 EVH |
272 | if (!ts) |
273 | return -EREMOTEIO; | |
8a0dc95f | 274 | |
5503ac56 EVH |
275 | if (!(ts->rd->f_flags & O_NONBLOCK)) |
276 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n"); | |
8a0dc95f | 277 | |
5503ac56 EVH |
278 | ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); |
279 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
280 | client->status = Disconnected; | |
281 | return ret; | |
8a0dc95f EVH |
282 | } |
283 | ||
284 | /** | |
5503ac56 EVH |
285 | * p9_read_work - called when there is some data to be read from a transport |
286 | * @work: container of work to be done | |
ee443996 | 287 | * |
8a0dc95f | 288 | */ |
ee443996 | 289 | |
5503ac56 | 290 | static void p9_read_work(struct work_struct *work) |
8a0dc95f | 291 | { |
5503ac56 EVH |
292 | int n, err; |
293 | struct p9_conn *m; | |
5503ac56 EVH |
294 | |
295 | m = container_of(work, struct p9_conn, rq); | |
8a0dc95f EVH |
296 | |
297 | if (m->err < 0) | |
298 | return; | |
299 | ||
51a87c55 | 300 | P9_DPRINTK(P9_DEBUG_TRANS, "start mux %p pos %d\n", m, m->rpos); |
8a0dc95f | 301 | |
1b0a763b EVH |
302 | if (!m->rbuf) { |
303 | m->rbuf = m->tmp_buf; | |
5503ac56 | 304 | m->rpos = 0; |
1b0a763b | 305 | m->rsize = 7; /* start by reading header */ |
8a0dc95f EVH |
306 | } |
307 | ||
5503ac56 | 308 | clear_bit(Rpending, &m->wsched); |
51a87c55 | 309 | P9_DPRINTK(P9_DEBUG_TRANS, "read mux %p pos %d size: %d = %d\n", m, |
1b0a763b | 310 | m->rpos, m->rsize, m->rsize-m->rpos); |
5503ac56 | 311 | err = p9_fd_read(m->client, m->rbuf + m->rpos, |
1b0a763b | 312 | m->rsize - m->rpos); |
51a87c55 | 313 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err); |
5503ac56 EVH |
314 | if (err == -EAGAIN) { |
315 | clear_bit(Rworksched, &m->wsched); | |
316 | return; | |
8a0dc95f | 317 | } |
8a0dc95f | 318 | |
5503ac56 EVH |
319 | if (err <= 0) |
320 | goto error; | |
321 | ||
322 | m->rpos += err; | |
1b0a763b EVH |
323 | |
324 | if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */ | |
325 | u16 tag; | |
51a87c55 | 326 | P9_DPRINTK(P9_DEBUG_TRANS, "got new header\n"); |
1b0a763b EVH |
327 | |
328 | n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */ | |
5503ac56 EVH |
329 | if (n >= m->client->msize) { |
330 | P9_DPRINTK(P9_DEBUG_ERROR, | |
331 | "requested packet size too big: %d\n", n); | |
332 | err = -EIO; | |
333 | goto error; | |
334 | } | |
335 | ||
1b0a763b | 336 | tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */ |
51a87c55 EVH |
337 | P9_DPRINTK(P9_DEBUG_TRANS, |
338 | "mux %p pkt: size: %d bytes tag: %d\n", m, n, tag); | |
1b0a763b EVH |
339 | |
340 | m->req = p9_tag_lookup(m->client, tag); | |
1bab88b2 LI |
341 | if (!m->req || (m->req->status != REQ_STATUS_SENT && |
342 | m->req->status != REQ_STATUS_FLSH)) { | |
1b0a763b EVH |
343 | P9_DPRINTK(P9_DEBUG_ERROR, "Unexpected packet tag %d\n", |
344 | tag); | |
345 | err = -EIO; | |
346 | goto error; | |
347 | } | |
348 | ||
349 | if (m->req->rc == NULL) { | |
350 | m->req->rc = kmalloc(sizeof(struct p9_fcall) + | |
351 | m->client->msize, GFP_KERNEL); | |
352 | if (!m->req->rc) { | |
353 | m->req = NULL; | |
354 | err = -ENOMEM; | |
355 | goto error; | |
356 | } | |
357 | } | |
358 | m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall); | |
359 | memcpy(m->rbuf, m->tmp_buf, m->rsize); | |
360 | m->rsize = n; | |
361 | } | |
5503ac56 | 362 | |
1b0a763b EVH |
363 | /* not an else because some packets (like clunk) have no payload */ |
364 | if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */ | |
51a87c55 | 365 | P9_DPRINTK(P9_DEBUG_TRANS, "got new packet\n"); |
7eb923b8 | 366 | spin_lock(&m->client->lock); |
1bab88b2 LI |
367 | if (m->req->status != REQ_STATUS_ERROR) |
368 | m->req->status = REQ_STATUS_RCVD; | |
91b8534f | 369 | list_del(&m->req->req_list); |
7eb923b8 | 370 | spin_unlock(&m->client->lock); |
91b8534f | 371 | p9_client_cb(m->client, m->req); |
1b0a763b EVH |
372 | m->rbuf = NULL; |
373 | m->rpos = 0; | |
374 | m->rsize = 0; | |
1b0a763b | 375 | m->req = NULL; |
5503ac56 EVH |
376 | } |
377 | ||
378 | if (!list_empty(&m->req_list)) { | |
379 | if (test_and_clear_bit(Rpending, &m->wsched)) | |
380 | n = POLLIN; | |
381 | else | |
382 | n = p9_fd_poll(m->client, NULL); | |
383 | ||
384 | if (n & POLLIN) { | |
51a87c55 | 385 | P9_DPRINTK(P9_DEBUG_TRANS, "sched read work %p\n", m); |
5503ac56 EVH |
386 | queue_work(p9_mux_wq, &m->rq); |
387 | } else | |
388 | clear_bit(Rworksched, &m->wsched); | |
389 | } else | |
390 | clear_bit(Rworksched, &m->wsched); | |
391 | ||
392 | return; | |
5503ac56 EVH |
393 | error: |
394 | p9_conn_cancel(m, err); | |
395 | clear_bit(Rworksched, &m->wsched); | |
396 | } | |
397 | ||
398 | /** | |
399 | * p9_fd_write - write to a socket | |
400 | * @client: client instance | |
401 | * @v: buffer to send data from | |
402 | * @len: size of send buffer | |
ee443996 | 403 | * |
8a0dc95f | 404 | */ |
ee443996 | 405 | |
5503ac56 | 406 | static int p9_fd_write(struct p9_client *client, void *v, int len) |
8a0dc95f | 407 | { |
5503ac56 EVH |
408 | int ret; |
409 | mm_segment_t oldfs; | |
410 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 411 | |
5503ac56 EVH |
412 | if (client && client->status != Disconnected) |
413 | ts = client->trans; | |
8a0dc95f | 414 | |
5503ac56 EVH |
415 | if (!ts) |
416 | return -EREMOTEIO; | |
8a0dc95f | 417 | |
5503ac56 EVH |
418 | if (!(ts->wr->f_flags & O_NONBLOCK)) |
419 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n"); | |
992b3f1d | 420 | |
5503ac56 EVH |
421 | oldfs = get_fs(); |
422 | set_fs(get_ds()); | |
423 | /* The cast to a user pointer is valid due to the set_fs() */ | |
e3db6cb4 | 424 | ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos); |
5503ac56 | 425 | set_fs(oldfs); |
992b3f1d | 426 | |
5503ac56 EVH |
427 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
428 | client->status = Disconnected; | |
429 | return ret; | |
8a0dc95f EVH |
430 | } |
431 | ||
432 | /** | |
433 | * p9_write_work - called when a transport can send some data | |
ee443996 EVH |
434 | * @work: container for work to be done |
435 | * | |
8a0dc95f | 436 | */ |
ee443996 | 437 | |
8a0dc95f EVH |
438 | static void p9_write_work(struct work_struct *work) |
439 | { | |
440 | int n, err; | |
441 | struct p9_conn *m; | |
673d62cd | 442 | struct p9_req_t *req; |
8a0dc95f EVH |
443 | |
444 | m = container_of(work, struct p9_conn, wq); | |
445 | ||
446 | if (m->err < 0) { | |
447 | clear_bit(Wworksched, &m->wsched); | |
448 | return; | |
449 | } | |
450 | ||
451 | if (!m->wsize) { | |
452 | if (list_empty(&m->unsent_req_list)) { | |
453 | clear_bit(Wworksched, &m->wsched); | |
454 | return; | |
455 | } | |
456 | ||
673d62cd EVH |
457 | spin_lock(&m->client->lock); |
458 | req = list_entry(m->unsent_req_list.next, struct p9_req_t, | |
8a0dc95f | 459 | req_list); |
673d62cd | 460 | req->status = REQ_STATUS_SENT; |
1bab88b2 | 461 | P9_DPRINTK(P9_DEBUG_TRANS, "move req %p\n", req); |
8a0dc95f | 462 | list_move_tail(&req->req_list, &m->req_list); |
8a0dc95f | 463 | |
673d62cd EVH |
464 | m->wbuf = req->tc->sdata; |
465 | m->wsize = req->tc->size; | |
8a0dc95f | 466 | m->wpos = 0; |
673d62cd | 467 | spin_unlock(&m->client->lock); |
8a0dc95f EVH |
468 | } |
469 | ||
51a87c55 | 470 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", m, m->wpos, |
8a0dc95f EVH |
471 | m->wsize); |
472 | clear_bit(Wpending, &m->wsched); | |
8b81ef58 | 473 | err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); |
51a87c55 | 474 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err); |
8a0dc95f EVH |
475 | if (err == -EAGAIN) { |
476 | clear_bit(Wworksched, &m->wsched); | |
477 | return; | |
478 | } | |
479 | ||
480 | if (err < 0) | |
481 | goto error; | |
482 | else if (err == 0) { | |
483 | err = -EREMOTEIO; | |
484 | goto error; | |
485 | } | |
486 | ||
487 | m->wpos += err; | |
488 | if (m->wpos == m->wsize) | |
489 | m->wpos = m->wsize = 0; | |
490 | ||
491 | if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) { | |
492 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
493 | n = POLLOUT; | |
494 | else | |
8b81ef58 | 495 | n = p9_fd_poll(m->client, NULL); |
8a0dc95f EVH |
496 | |
497 | if (n & POLLOUT) { | |
51a87c55 | 498 | P9_DPRINTK(P9_DEBUG_TRANS, "sched write work %p\n", m); |
8a0dc95f EVH |
499 | queue_work(p9_mux_wq, &m->wq); |
500 | } else | |
501 | clear_bit(Wworksched, &m->wsched); | |
502 | } else | |
503 | clear_bit(Wworksched, &m->wsched); | |
504 | ||
505 | return; | |
506 | ||
507 | error: | |
508 | p9_conn_cancel(m, err); | |
509 | clear_bit(Wworksched, &m->wsched); | |
510 | } | |
511 | ||
5503ac56 | 512 | static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key) |
8a0dc95f | 513 | { |
5503ac56 EVH |
514 | struct p9_poll_wait *pwait = |
515 | container_of(wait, struct p9_poll_wait, wait); | |
516 | struct p9_conn *m = pwait->conn; | |
517 | unsigned long flags; | |
518 | DECLARE_WAITQUEUE(dummy_wait, p9_poll_task); | |
8a0dc95f | 519 | |
5503ac56 EVH |
520 | spin_lock_irqsave(&p9_poll_lock, flags); |
521 | if (list_empty(&m->poll_pending_link)) | |
522 | list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); | |
523 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
8a0dc95f | 524 | |
5503ac56 EVH |
525 | /* perform the default wake up operation */ |
526 | return default_wake_function(&dummy_wait, mode, sync, key); | |
8a0dc95f EVH |
527 | } |
528 | ||
529 | /** | |
5503ac56 EVH |
530 | * p9_pollwait - add poll task to the wait queue |
531 | * @filp: file pointer being polled | |
532 | * @wait_address: wait_q to block on | |
533 | * @p: poll state | |
ee443996 | 534 | * |
5503ac56 | 535 | * called by files poll operation to add v9fs-poll task to files wait queue |
8a0dc95f | 536 | */ |
ee443996 | 537 | |
5503ac56 EVH |
538 | static void |
539 | p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) | |
8a0dc95f | 540 | { |
5503ac56 EVH |
541 | struct p9_conn *m = container_of(p, struct p9_conn, pt); |
542 | struct p9_poll_wait *pwait = NULL; | |
543 | int i; | |
8a0dc95f | 544 | |
5503ac56 EVH |
545 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
546 | if (m->poll_wait[i].wait_addr == NULL) { | |
547 | pwait = &m->poll_wait[i]; | |
548 | break; | |
8a0dc95f | 549 | } |
8a0dc95f EVH |
550 | } |
551 | ||
5503ac56 EVH |
552 | if (!pwait) { |
553 | P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n"); | |
8a0dc95f EVH |
554 | return; |
555 | } | |
556 | ||
5503ac56 EVH |
557 | pwait->conn = m; |
558 | pwait->wait_addr = wait_address; | |
559 | init_waitqueue_func_entry(&pwait->wait, p9_pollwake); | |
560 | add_wait_queue(wait_address, &pwait->wait); | |
561 | } | |
8a0dc95f | 562 | |
5503ac56 EVH |
563 | /** |
564 | * p9_conn_create - allocate and initialize the per-session mux data | |
565 | * @client: client instance | |
566 | * | |
567 | * Note: Creates the polling task if this is the first session. | |
568 | */ | |
8a0dc95f | 569 | |
5503ac56 EVH |
570 | static struct p9_conn *p9_conn_create(struct p9_client *client) |
571 | { | |
95820a36 | 572 | int n; |
5503ac56 | 573 | struct p9_conn *m; |
8a0dc95f | 574 | |
51a87c55 EVH |
575 | P9_DPRINTK(P9_DEBUG_TRANS, "client %p msize %d\n", client, |
576 | client->msize); | |
5503ac56 EVH |
577 | m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL); |
578 | if (!m) | |
579 | return ERR_PTR(-ENOMEM); | |
8a0dc95f | 580 | |
5503ac56 EVH |
581 | INIT_LIST_HEAD(&m->mux_list); |
582 | m->client = client; | |
8a0dc95f | 583 | |
5503ac56 EVH |
584 | INIT_LIST_HEAD(&m->req_list); |
585 | INIT_LIST_HEAD(&m->unsent_req_list); | |
586 | INIT_WORK(&m->rq, p9_read_work); | |
587 | INIT_WORK(&m->wq, p9_write_work); | |
588 | INIT_LIST_HEAD(&m->poll_pending_link); | |
589 | init_poll_funcptr(&m->pt, p9_pollwait); | |
8a0dc95f | 590 | |
5503ac56 EVH |
591 | n = p9_fd_poll(client, &m->pt); |
592 | if (n & POLLIN) { | |
51a87c55 | 593 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can read\n", m); |
5503ac56 EVH |
594 | set_bit(Rpending, &m->wsched); |
595 | } | |
8a0dc95f | 596 | |
5503ac56 | 597 | if (n & POLLOUT) { |
51a87c55 | 598 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can write\n", m); |
5503ac56 EVH |
599 | set_bit(Wpending, &m->wsched); |
600 | } | |
601 | ||
5503ac56 EVH |
602 | return m; |
603 | } | |
8a0dc95f | 604 | |
5503ac56 EVH |
605 | /** |
606 | * p9_poll_mux - polls a mux and schedules read or write works if necessary | |
607 | * @m: connection to poll | |
608 | * | |
609 | */ | |
610 | ||
611 | static void p9_poll_mux(struct p9_conn *m) | |
612 | { | |
613 | int n; | |
614 | ||
615 | if (m->err < 0) | |
616 | return; | |
617 | ||
618 | n = p9_fd_poll(m->client, NULL); | |
619 | if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { | |
51a87c55 | 620 | P9_DPRINTK(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n); |
5503ac56 EVH |
621 | if (n >= 0) |
622 | n = -ECONNRESET; | |
623 | p9_conn_cancel(m, n); | |
624 | } | |
625 | ||
626 | if (n & POLLIN) { | |
627 | set_bit(Rpending, &m->wsched); | |
51a87c55 | 628 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can read\n", m); |
5503ac56 | 629 | if (!test_and_set_bit(Rworksched, &m->wsched)) { |
51a87c55 | 630 | P9_DPRINTK(P9_DEBUG_TRANS, "sched read work %p\n", m); |
8a0dc95f | 631 | queue_work(p9_mux_wq, &m->rq); |
5503ac56 EVH |
632 | } |
633 | } | |
8a0dc95f | 634 | |
5503ac56 EVH |
635 | if (n & POLLOUT) { |
636 | set_bit(Wpending, &m->wsched); | |
51a87c55 | 637 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can write\n", m); |
f64f9e71 JP |
638 | if ((m->wsize || !list_empty(&m->unsent_req_list)) && |
639 | !test_and_set_bit(Wworksched, &m->wsched)) { | |
51a87c55 | 640 | P9_DPRINTK(P9_DEBUG_TRANS, "sched write work %p\n", m); |
5503ac56 EVH |
641 | queue_work(p9_mux_wq, &m->wq); |
642 | } | |
643 | } | |
8a0dc95f EVH |
644 | } |
645 | ||
646 | /** | |
91b8534f | 647 | * p9_fd_request - send 9P request |
8a0dc95f EVH |
648 | * The function can sleep until the request is scheduled for sending. |
649 | * The function can be interrupted. Return from the function is not | |
91b8534f | 650 | * a guarantee that the request is sent successfully. |
8a0dc95f | 651 | * |
91b8534f EVH |
652 | * @client: client instance |
653 | * @req: request to be sent | |
ee443996 | 654 | * |
8a0dc95f | 655 | */ |
ee443996 | 656 | |
91b8534f | 657 | static int p9_fd_request(struct p9_client *client, struct p9_req_t *req) |
8a0dc95f EVH |
658 | { |
659 | int n; | |
91b8534f EVH |
660 | struct p9_trans_fd *ts = client->trans; |
661 | struct p9_conn *m = ts->conn; | |
8a0dc95f | 662 | |
51a87c55 EVH |
663 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", m, |
664 | current, req->tc, req->tc->id); | |
8a0dc95f | 665 | if (m->err < 0) |
91b8534f | 666 | return m->err; |
8a0dc95f | 667 | |
91b8534f | 668 | spin_lock(&client->lock); |
7eb923b8 | 669 | req->status = REQ_STATUS_UNSENT; |
8a0dc95f | 670 | list_add_tail(&req->req_list, &m->unsent_req_list); |
91b8534f | 671 | spin_unlock(&client->lock); |
8a0dc95f EVH |
672 | |
673 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
674 | n = POLLOUT; | |
675 | else | |
8b81ef58 | 676 | n = p9_fd_poll(m->client, NULL); |
8a0dc95f EVH |
677 | |
678 | if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) | |
679 | queue_work(p9_mux_wq, &m->wq); | |
680 | ||
91b8534f | 681 | return 0; |
8a0dc95f EVH |
682 | } |
683 | ||
91b8534f | 684 | static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req) |
8a0dc95f | 685 | { |
7eb923b8 | 686 | int ret = 1; |
8a0dc95f | 687 | |
0b15a3a5 | 688 | P9_DPRINTK(P9_DEBUG_TRANS, "client %p req %p\n", client, req); |
8a0dc95f | 689 | |
91b8534f | 690 | spin_lock(&client->lock); |
91b8534f | 691 | |
91b8534f | 692 | if (req->status == REQ_STATUS_UNSENT) { |
1bab88b2 | 693 | list_del(&req->req_list); |
91b8534f | 694 | req->status = REQ_STATUS_FLSHD; |
7eb923b8 | 695 | ret = 0; |
1bab88b2 LI |
696 | } else if (req->status == REQ_STATUS_SENT) |
697 | req->status = REQ_STATUS_FLSH; | |
8a0dc95f | 698 | |
7eb923b8 EVH |
699 | spin_unlock(&client->lock); |
700 | ||
701 | return ret; | |
8a0dc95f EVH |
702 | } |
703 | ||
a80d923e | 704 | /** |
0e15597e AK |
705 | * parse_opts - parse mount options into p9_fd_opts structure |
706 | * @params: options string passed from mount | |
707 | * @opts: fd transport-specific structure to parse options into | |
a80d923e | 708 | * |
bb8ffdfc | 709 | * Returns 0 upon success, -ERRNO upon failure |
a80d923e | 710 | */ |
bd238fb4 | 711 | |
bb8ffdfc | 712 | static int parse_opts(char *params, struct p9_fd_opts *opts) |
bd238fb4 | 713 | { |
a80d923e EVH |
714 | char *p; |
715 | substring_t args[MAX_OPT_ARGS]; | |
716 | int option; | |
d8c8a9e3 | 717 | char *options, *tmp_options; |
a80d923e | 718 | int ret; |
bd238fb4 | 719 | |
a80d923e EVH |
720 | opts->port = P9_PORT; |
721 | opts->rfd = ~0; | |
722 | opts->wfd = ~0; | |
bd238fb4 | 723 | |
bb8ffdfc EVH |
724 | if (!params) |
725 | return 0; | |
726 | ||
d8c8a9e3 EVH |
727 | tmp_options = kstrdup(params, GFP_KERNEL); |
728 | if (!tmp_options) { | |
bb8ffdfc EVH |
729 | P9_DPRINTK(P9_DEBUG_ERROR, |
730 | "failed to allocate copy of option string\n"); | |
731 | return -ENOMEM; | |
732 | } | |
d8c8a9e3 | 733 | options = tmp_options; |
bd238fb4 | 734 | |
a80d923e EVH |
735 | while ((p = strsep(&options, ",")) != NULL) { |
736 | int token; | |
bb8ffdfc | 737 | int r; |
a80d923e EVH |
738 | if (!*p) |
739 | continue; | |
740 | token = match_token(p, tokens, args); | |
15da4b16 AK |
741 | if (token != Opt_err) { |
742 | r = match_int(&args[0], &option); | |
743 | if (r < 0) { | |
744 | P9_DPRINTK(P9_DEBUG_ERROR, | |
745 | "integer field, but no integer?\n"); | |
746 | ret = r; | |
747 | continue; | |
748 | } | |
a80d923e EVH |
749 | } |
750 | switch (token) { | |
751 | case Opt_port: | |
752 | opts->port = option; | |
753 | break; | |
754 | case Opt_rfdno: | |
755 | opts->rfd = option; | |
756 | break; | |
757 | case Opt_wfdno: | |
758 | opts->wfd = option; | |
759 | break; | |
760 | default: | |
761 | continue; | |
762 | } | |
bd238fb4 | 763 | } |
d8c8a9e3 EVH |
764 | |
765 | kfree(tmp_options); | |
bb8ffdfc | 766 | return 0; |
bd238fb4 | 767 | } |
bd238fb4 | 768 | |
8b81ef58 | 769 | static int p9_fd_open(struct p9_client *client, int rfd, int wfd) |
bd238fb4 | 770 | { |
a80d923e EVH |
771 | struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), |
772 | GFP_KERNEL); | |
773 | if (!ts) | |
774 | return -ENOMEM; | |
bd238fb4 | 775 | |
a80d923e EVH |
776 | ts->rd = fget(rfd); |
777 | ts->wr = fget(wfd); | |
778 | if (!ts->rd || !ts->wr) { | |
779 | if (ts->rd) | |
780 | fput(ts->rd); | |
781 | if (ts->wr) | |
782 | fput(ts->wr); | |
783 | kfree(ts); | |
784 | return -EIO; | |
bd238fb4 LI |
785 | } |
786 | ||
8b81ef58 EVH |
787 | client->trans = ts; |
788 | client->status = Connected; | |
bd238fb4 | 789 | |
a80d923e | 790 | return 0; |
bd238fb4 | 791 | } |
bd238fb4 | 792 | |
8b81ef58 | 793 | static int p9_socket_open(struct p9_client *client, struct socket *csocket) |
bd238fb4 | 794 | { |
6b18662e AV |
795 | struct p9_trans_fd *p; |
796 | int ret, fd; | |
797 | ||
798 | p = kmalloc(sizeof(struct p9_trans_fd), GFP_KERNEL); | |
799 | if (!p) | |
800 | return -ENOMEM; | |
bd238fb4 LI |
801 | |
802 | csocket->sk->sk_allocation = GFP_NOIO; | |
a677a039 | 803 | fd = sock_map_fd(csocket, 0); |
bd238fb4 LI |
804 | if (fd < 0) { |
805 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n"); | |
6b18662e AV |
806 | sock_release(csocket); |
807 | kfree(p); | |
bd238fb4 LI |
808 | return fd; |
809 | } | |
810 | ||
6b18662e AV |
811 | get_file(csocket->file); |
812 | get_file(csocket->file); | |
813 | p->wr = p->rd = csocket->file; | |
814 | client->trans = p; | |
815 | client->status = Connected; | |
816 | ||
817 | sys_close(fd); /* still racy */ | |
818 | ||
819 | p->rd->f_flags |= O_NONBLOCK; | |
820 | ||
821 | p->conn = p9_conn_create(client); | |
822 | if (IS_ERR(p->conn)) { | |
823 | ret = PTR_ERR(p->conn); | |
824 | p->conn = NULL; | |
825 | kfree(p); | |
826 | sockfd_put(csocket); | |
bd238fb4 LI |
827 | sockfd_put(csocket); |
828 | return ret; | |
829 | } | |
bd238fb4 LI |
830 | return 0; |
831 | } | |
832 | ||
bd238fb4 | 833 | /** |
5503ac56 EVH |
834 | * p9_mux_destroy - cancels all pending requests and frees mux resources |
835 | * @m: mux to destroy | |
bd238fb4 LI |
836 | * |
837 | */ | |
ee443996 | 838 | |
5503ac56 | 839 | static void p9_conn_destroy(struct p9_conn *m) |
bd238fb4 | 840 | { |
51a87c55 | 841 | P9_DPRINTK(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", m, |
5503ac56 | 842 | m->mux_list.prev, m->mux_list.next); |
bd238fb4 | 843 | |
5503ac56 EVH |
844 | p9_mux_poll_stop(m); |
845 | cancel_work_sync(&m->rq); | |
846 | cancel_work_sync(&m->wq); | |
bd238fb4 | 847 | |
5503ac56 | 848 | p9_conn_cancel(m, -ECONNRESET); |
bd238fb4 | 849 | |
5503ac56 | 850 | m->client = NULL; |
5503ac56 | 851 | kfree(m); |
bd238fb4 LI |
852 | } |
853 | ||
854 | /** | |
8b81ef58 EVH |
855 | * p9_fd_close - shutdown file descriptor transport |
856 | * @client: client instance | |
bd238fb4 LI |
857 | * |
858 | */ | |
ee443996 | 859 | |
8b81ef58 | 860 | static void p9_fd_close(struct p9_client *client) |
bd238fb4 LI |
861 | { |
862 | struct p9_trans_fd *ts; | |
863 | ||
8b81ef58 | 864 | if (!client) |
bd238fb4 LI |
865 | return; |
866 | ||
8b81ef58 | 867 | ts = client->trans; |
bd238fb4 LI |
868 | if (!ts) |
869 | return; | |
870 | ||
8b81ef58 EVH |
871 | client->status = Disconnected; |
872 | ||
8a0dc95f EVH |
873 | p9_conn_destroy(ts->conn); |
874 | ||
bd238fb4 LI |
875 | if (ts->rd) |
876 | fput(ts->rd); | |
877 | if (ts->wr) | |
878 | fput(ts->wr); | |
8b81ef58 | 879 | |
bd238fb4 LI |
880 | kfree(ts); |
881 | } | |
882 | ||
887b3ece EVH |
883 | /* |
884 | * stolen from NFS - maybe should be made a generic function? | |
885 | */ | |
886 | static inline int valid_ipaddr4(const char *buf) | |
887 | { | |
888 | int rc, count, in[4]; | |
889 | ||
890 | rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); | |
891 | if (rc != 4) | |
892 | return -EINVAL; | |
893 | for (count = 0; count < 4; count++) { | |
894 | if (in[count] > 255) | |
895 | return -EINVAL; | |
896 | } | |
897 | return 0; | |
898 | } | |
899 | ||
8b81ef58 EVH |
900 | static int |
901 | p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
902 | { |
903 | int err; | |
a80d923e EVH |
904 | struct socket *csocket; |
905 | struct sockaddr_in sin_server; | |
906 | struct p9_fd_opts opts; | |
907 | ||
bb8ffdfc EVH |
908 | err = parse_opts(args, &opts); |
909 | if (err < 0) | |
8b81ef58 | 910 | return err; |
a80d923e | 911 | |
887b3ece | 912 | if (valid_ipaddr4(addr) < 0) |
8b81ef58 | 913 | return -EINVAL; |
887b3ece | 914 | |
a80d923e | 915 | csocket = NULL; |
a80d923e EVH |
916 | |
917 | sin_server.sin_family = AF_INET; | |
918 | sin_server.sin_addr.s_addr = in_aton(addr); | |
919 | sin_server.sin_port = htons(opts.port); | |
6b18662e | 920 | err = sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket); |
a80d923e | 921 | |
6b18662e | 922 | if (err) { |
a80d923e | 923 | P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n"); |
6b18662e | 924 | return err; |
a80d923e EVH |
925 | } |
926 | ||
927 | err = csocket->ops->connect(csocket, | |
928 | (struct sockaddr *)&sin_server, | |
929 | sizeof(struct sockaddr_in), 0); | |
930 | if (err < 0) { | |
931 | P9_EPRINTK(KERN_ERR, | |
932 | "p9_trans_tcp: problem connecting socket to %s\n", | |
933 | addr); | |
a80d923e | 934 | sock_release(csocket); |
6b18662e AV |
935 | return err; |
936 | } | |
a80d923e | 937 | |
6b18662e | 938 | return p9_socket_open(client, csocket); |
a80d923e EVH |
939 | } |
940 | ||
8b81ef58 EVH |
941 | static int |
942 | p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
943 | { |
944 | int err; | |
945 | struct socket *csocket; | |
946 | struct sockaddr_un sun_server; | |
a80d923e EVH |
947 | |
948 | csocket = NULL; | |
a80d923e EVH |
949 | |
950 | if (strlen(addr) > UNIX_PATH_MAX) { | |
951 | P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n", | |
952 | addr); | |
6b18662e | 953 | return -ENAMETOOLONG; |
a80d923e EVH |
954 | } |
955 | ||
956 | sun_server.sun_family = PF_UNIX; | |
957 | strcpy(sun_server.sun_path, addr); | |
6b18662e AV |
958 | err = sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket); |
959 | if (err < 0) { | |
960 | P9_EPRINTK(KERN_ERR, "p9_trans_unix: problem creating socket\n"); | |
961 | return err; | |
962 | } | |
a80d923e EVH |
963 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, |
964 | sizeof(struct sockaddr_un) - 1, 0); | |
965 | if (err < 0) { | |
966 | P9_EPRINTK(KERN_ERR, | |
967 | "p9_trans_unix: problem connecting socket: %s: %d\n", | |
968 | addr, err); | |
a80d923e | 969 | sock_release(csocket); |
6b18662e AV |
970 | return err; |
971 | } | |
a80d923e | 972 | |
6b18662e | 973 | return p9_socket_open(client, csocket); |
a80d923e EVH |
974 | } |
975 | ||
8b81ef58 EVH |
976 | static int |
977 | p9_fd_create(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
978 | { |
979 | int err; | |
a80d923e | 980 | struct p9_fd_opts opts; |
6b18662e | 981 | struct p9_trans_fd *p; |
a80d923e EVH |
982 | |
983 | parse_opts(args, &opts); | |
984 | ||
985 | if (opts.rfd == ~0 || opts.wfd == ~0) { | |
986 | printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); | |
8b81ef58 | 987 | return -ENOPROTOOPT; |
a80d923e EVH |
988 | } |
989 | ||
8b81ef58 | 990 | err = p9_fd_open(client, opts.rfd, opts.wfd); |
a80d923e | 991 | if (err < 0) |
6b18662e | 992 | return err; |
a80d923e | 993 | |
8b81ef58 EVH |
994 | p = (struct p9_trans_fd *) client->trans; |
995 | p->conn = p9_conn_create(client); | |
8a0dc95f EVH |
996 | if (IS_ERR(p->conn)) { |
997 | err = PTR_ERR(p->conn); | |
998 | p->conn = NULL; | |
6b18662e AV |
999 | fput(p->rd); |
1000 | fput(p->wr); | |
1001 | return err; | |
8a0dc95f EVH |
1002 | } |
1003 | ||
8b81ef58 | 1004 | return 0; |
a80d923e EVH |
1005 | } |
1006 | ||
1007 | static struct p9_trans_module p9_tcp_trans = { | |
1008 | .name = "tcp", | |
1009 | .maxsize = MAX_SOCK_BUF, | |
1010 | .def = 1, | |
8b81ef58 EVH |
1011 | .create = p9_fd_create_tcp, |
1012 | .close = p9_fd_close, | |
91b8534f EVH |
1013 | .request = p9_fd_request, |
1014 | .cancel = p9_fd_cancel, | |
72029fe8 | 1015 | .owner = THIS_MODULE, |
a80d923e EVH |
1016 | }; |
1017 | ||
1018 | static struct p9_trans_module p9_unix_trans = { | |
1019 | .name = "unix", | |
1020 | .maxsize = MAX_SOCK_BUF, | |
1021 | .def = 0, | |
8b81ef58 EVH |
1022 | .create = p9_fd_create_unix, |
1023 | .close = p9_fd_close, | |
91b8534f EVH |
1024 | .request = p9_fd_request, |
1025 | .cancel = p9_fd_cancel, | |
72029fe8 | 1026 | .owner = THIS_MODULE, |
a80d923e EVH |
1027 | }; |
1028 | ||
1029 | static struct p9_trans_module p9_fd_trans = { | |
1030 | .name = "fd", | |
1031 | .maxsize = MAX_SOCK_BUF, | |
1032 | .def = 0, | |
8b81ef58 EVH |
1033 | .create = p9_fd_create, |
1034 | .close = p9_fd_close, | |
91b8534f EVH |
1035 | .request = p9_fd_request, |
1036 | .cancel = p9_fd_cancel, | |
72029fe8 | 1037 | .owner = THIS_MODULE, |
a80d923e EVH |
1038 | }; |
1039 | ||
5503ac56 EVH |
1040 | /** |
1041 | * p9_poll_proc - poll worker thread | |
1042 | * @a: thread state and arguments | |
1043 | * | |
1044 | * polls all v9fs transports for new events and queues the appropriate | |
1045 | * work to the work queue | |
1046 | * | |
1047 | */ | |
1048 | ||
1049 | static int p9_poll_proc(void *a) | |
1050 | { | |
1051 | unsigned long flags; | |
1052 | ||
51a87c55 | 1053 | P9_DPRINTK(P9_DEBUG_TRANS, "start %p\n", current); |
5503ac56 EVH |
1054 | repeat: |
1055 | spin_lock_irqsave(&p9_poll_lock, flags); | |
1056 | while (!list_empty(&p9_poll_pending_list)) { | |
1057 | struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, | |
1058 | struct p9_conn, | |
1059 | poll_pending_link); | |
1060 | list_del_init(&conn->poll_pending_link); | |
1061 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1062 | ||
1063 | p9_poll_mux(conn); | |
1064 | ||
1065 | spin_lock_irqsave(&p9_poll_lock, flags); | |
1066 | } | |
1067 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1068 | ||
1069 | set_current_state(TASK_INTERRUPTIBLE); | |
1070 | if (list_empty(&p9_poll_pending_list)) { | |
51a87c55 | 1071 | P9_DPRINTK(P9_DEBUG_TRANS, "sleeping...\n"); |
5503ac56 EVH |
1072 | schedule(); |
1073 | } | |
1074 | __set_current_state(TASK_RUNNING); | |
1075 | ||
1076 | if (!kthread_should_stop()) | |
1077 | goto repeat; | |
1078 | ||
51a87c55 | 1079 | P9_DPRINTK(P9_DEBUG_TRANS, "finish\n"); |
5503ac56 EVH |
1080 | return 0; |
1081 | } | |
1082 | ||
887b3ece | 1083 | int p9_trans_fd_init(void) |
a80d923e | 1084 | { |
206ca50d TH |
1085 | p9_mux_wq = create_workqueue("v9fs"); |
1086 | if (!p9_mux_wq) { | |
1087 | printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n"); | |
1088 | return -ENOMEM; | |
8a0dc95f EVH |
1089 | } |
1090 | ||
992b3f1d TH |
1091 | p9_poll_task = kthread_run(p9_poll_proc, NULL, "v9fs-poll"); |
1092 | if (IS_ERR(p9_poll_task)) { | |
1093 | destroy_workqueue(p9_mux_wq); | |
1094 | printk(KERN_WARNING "v9fs: mux: creating poll task failed\n"); | |
1095 | return PTR_ERR(p9_poll_task); | |
1096 | } | |
1097 | ||
a80d923e EVH |
1098 | v9fs_register_trans(&p9_tcp_trans); |
1099 | v9fs_register_trans(&p9_unix_trans); | |
1100 | v9fs_register_trans(&p9_fd_trans); | |
1101 | ||
3387b804 | 1102 | return 0; |
a80d923e | 1103 | } |
72029fe8 TH |
1104 | |
1105 | void p9_trans_fd_exit(void) | |
1106 | { | |
992b3f1d | 1107 | kthread_stop(p9_poll_task); |
72029fe8 TH |
1108 | v9fs_unregister_trans(&p9_tcp_trans); |
1109 | v9fs_unregister_trans(&p9_unix_trans); | |
1110 | v9fs_unregister_trans(&p9_fd_trans); | |
206ca50d TH |
1111 | |
1112 | destroy_workqueue(p9_mux_wq); | |
72029fe8 | 1113 | } |