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 LI |
41 | #include <net/9p/9p.h> |
42 | #include <net/9p/transport.h> | |
43 | ||
44 | #define P9_PORT 564 | |
a80d923e | 45 | #define MAX_SOCK_BUF (64*1024) |
8a0dc95f EVH |
46 | #define ERREQFLUSH 1 |
47 | #define SCHED_TIMEOUT 10 | |
48 | #define MAXPOLLWADDR 2 | |
a80d923e EVH |
49 | |
50 | struct p9_fd_opts { | |
51 | int rfd; | |
52 | int wfd; | |
53 | u16 port; | |
54 | }; | |
bd238fb4 LI |
55 | |
56 | struct p9_trans_fd { | |
57 | struct file *rd; | |
58 | struct file *wr; | |
8a0dc95f | 59 | struct p9_conn *conn; |
bd238fb4 LI |
60 | }; |
61 | ||
a80d923e EVH |
62 | /* |
63 | * Option Parsing (code inspired by NFS code) | |
64 | * - a little lazy - parse all fd-transport options | |
65 | */ | |
bd238fb4 | 66 | |
a80d923e EVH |
67 | enum { |
68 | /* Options that take integer arguments */ | |
55762690 | 69 | Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
a80d923e | 70 | }; |
bd238fb4 | 71 | |
a80d923e EVH |
72 | static match_table_t tokens = { |
73 | {Opt_port, "port=%u"}, | |
74 | {Opt_rfdno, "rfdno=%u"}, | |
75 | {Opt_wfdno, "wfdno=%u"}, | |
55762690 | 76 | {Opt_err, NULL}, |
a80d923e | 77 | }; |
bd238fb4 | 78 | |
8a0dc95f EVH |
79 | enum { |
80 | Rworksched = 1, /* read work scheduled or running */ | |
81 | Rpending = 2, /* can read */ | |
82 | Wworksched = 4, /* write work scheduled or running */ | |
83 | Wpending = 8, /* can write */ | |
84 | }; | |
85 | ||
86 | enum { | |
87 | None, | |
88 | Flushing, | |
89 | Flushed, | |
90 | }; | |
91 | ||
92 | struct p9_req; | |
93 | ||
94 | typedef void (*p9_conn_req_callback)(struct p9_req *req, void *a); | |
95 | struct p9_req { | |
96 | spinlock_t lock; /* protect request structure */ | |
97 | int tag; | |
98 | struct p9_fcall *tcall; | |
99 | struct p9_fcall *rcall; | |
100 | int err; | |
101 | p9_conn_req_callback cb; | |
102 | void *cba; | |
103 | int flush; | |
104 | struct list_head req_list; | |
105 | }; | |
106 | ||
107 | struct p9_mux_poll_task; | |
108 | ||
109 | struct p9_conn { | |
110 | spinlock_t lock; /* protect lock structure */ | |
111 | struct list_head mux_list; | |
112 | struct p9_mux_poll_task *poll_task; | |
113 | int msize; | |
114 | unsigned char extended; | |
115 | struct p9_trans *trans; | |
116 | struct p9_idpool *tagpool; | |
117 | int err; | |
118 | wait_queue_head_t equeue; | |
119 | struct list_head req_list; | |
120 | struct list_head unsent_req_list; | |
121 | struct p9_fcall *rcall; | |
122 | int rpos; | |
123 | char *rbuf; | |
124 | int wpos; | |
125 | int wsize; | |
126 | char *wbuf; | |
127 | wait_queue_t poll_wait[MAXPOLLWADDR]; | |
128 | wait_queue_head_t *poll_waddr[MAXPOLLWADDR]; | |
129 | poll_table pt; | |
130 | struct work_struct rq; | |
131 | struct work_struct wq; | |
132 | unsigned long wsched; | |
133 | }; | |
134 | ||
135 | struct p9_mux_poll_task { | |
136 | struct task_struct *task; | |
137 | struct list_head mux_list; | |
138 | int muxnum; | |
139 | }; | |
140 | ||
141 | struct p9_mux_rpc { | |
142 | struct p9_conn *m; | |
143 | int err; | |
144 | struct p9_fcall *tcall; | |
145 | struct p9_fcall *rcall; | |
146 | wait_queue_head_t wqueue; | |
147 | }; | |
148 | ||
149 | static int p9_poll_proc(void *); | |
150 | static void p9_read_work(struct work_struct *work); | |
151 | static void p9_write_work(struct work_struct *work); | |
152 | static void p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, | |
153 | poll_table *p); | |
154 | static int p9_fd_write(struct p9_trans *trans, void *v, int len); | |
155 | static int p9_fd_read(struct p9_trans *trans, void *v, int len); | |
156 | ||
157 | static DEFINE_MUTEX(p9_mux_task_lock); | |
158 | static struct workqueue_struct *p9_mux_wq; | |
159 | ||
160 | static int p9_mux_num; | |
161 | static int p9_mux_poll_task_num; | |
162 | static struct p9_mux_poll_task p9_mux_poll_tasks[100]; | |
163 | ||
164 | static void p9_conn_destroy(struct p9_conn *); | |
165 | static unsigned int p9_fd_poll(struct p9_trans *trans, | |
166 | struct poll_table_struct *pt); | |
167 | ||
168 | #ifdef P9_NONBLOCK | |
169 | static int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc, | |
170 | p9_conn_req_callback cb, void *a); | |
171 | #endif /* P9_NONBLOCK */ | |
172 | ||
173 | static void p9_conn_cancel(struct p9_conn *m, int err); | |
174 | ||
175 | static int p9_mux_global_init(void) | |
176 | { | |
177 | int i; | |
178 | ||
179 | for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) | |
180 | p9_mux_poll_tasks[i].task = NULL; | |
181 | ||
182 | p9_mux_wq = create_workqueue("v9fs"); | |
183 | if (!p9_mux_wq) { | |
184 | printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n"); | |
185 | return -ENOMEM; | |
186 | } | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | static u16 p9_mux_get_tag(struct p9_conn *m) | |
192 | { | |
193 | int tag; | |
194 | ||
195 | tag = p9_idpool_get(m->tagpool); | |
196 | if (tag < 0) | |
197 | return P9_NOTAG; | |
198 | else | |
199 | return (u16) tag; | |
200 | } | |
201 | ||
202 | static void p9_mux_put_tag(struct p9_conn *m, u16 tag) | |
203 | { | |
204 | if (tag != P9_NOTAG && p9_idpool_check(tag, m->tagpool)) | |
205 | p9_idpool_put(tag, m->tagpool); | |
206 | } | |
207 | ||
208 | /** | |
209 | * p9_mux_calc_poll_procs - calculates the number of polling procs | |
210 | * based on the number of mounted v9fs filesystems. | |
211 | * | |
212 | * The current implementation returns sqrt of the number of mounts. | |
213 | */ | |
214 | static int p9_mux_calc_poll_procs(int muxnum) | |
215 | { | |
216 | int n; | |
217 | ||
218 | if (p9_mux_poll_task_num) | |
219 | n = muxnum / p9_mux_poll_task_num + | |
220 | (muxnum % p9_mux_poll_task_num ? 1 : 0); | |
221 | else | |
222 | n = 1; | |
223 | ||
224 | if (n > ARRAY_SIZE(p9_mux_poll_tasks)) | |
225 | n = ARRAY_SIZE(p9_mux_poll_tasks); | |
226 | ||
227 | return n; | |
228 | } | |
229 | ||
230 | static int p9_mux_poll_start(struct p9_conn *m) | |
231 | { | |
232 | int i, n; | |
233 | struct p9_mux_poll_task *vpt, *vptlast; | |
234 | struct task_struct *pproc; | |
235 | ||
236 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p muxnum %d procnum %d\n", m, p9_mux_num, | |
237 | p9_mux_poll_task_num); | |
238 | mutex_lock(&p9_mux_task_lock); | |
239 | ||
240 | n = p9_mux_calc_poll_procs(p9_mux_num + 1); | |
241 | if (n > p9_mux_poll_task_num) { | |
242 | for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) { | |
243 | if (p9_mux_poll_tasks[i].task == NULL) { | |
244 | vpt = &p9_mux_poll_tasks[i]; | |
245 | P9_DPRINTK(P9_DEBUG_MUX, "create proc %p\n", | |
246 | vpt); | |
247 | pproc = kthread_create(p9_poll_proc, vpt, | |
248 | "v9fs-poll"); | |
249 | ||
250 | if (!IS_ERR(pproc)) { | |
251 | vpt->task = pproc; | |
252 | INIT_LIST_HEAD(&vpt->mux_list); | |
253 | vpt->muxnum = 0; | |
254 | p9_mux_poll_task_num++; | |
255 | wake_up_process(vpt->task); | |
256 | } | |
257 | break; | |
258 | } | |
259 | } | |
260 | ||
261 | if (i >= ARRAY_SIZE(p9_mux_poll_tasks)) | |
262 | P9_DPRINTK(P9_DEBUG_ERROR, | |
263 | "warning: no free poll slots\n"); | |
264 | } | |
265 | ||
266 | n = (p9_mux_num + 1) / p9_mux_poll_task_num + | |
267 | ((p9_mux_num + 1) % p9_mux_poll_task_num ? 1 : 0); | |
268 | ||
269 | vptlast = NULL; | |
270 | for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) { | |
271 | vpt = &p9_mux_poll_tasks[i]; | |
272 | if (vpt->task != NULL) { | |
273 | vptlast = vpt; | |
274 | if (vpt->muxnum < n) { | |
275 | P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i); | |
276 | list_add(&m->mux_list, &vpt->mux_list); | |
277 | vpt->muxnum++; | |
278 | m->poll_task = vpt; | |
279 | memset(&m->poll_waddr, 0, | |
280 | sizeof(m->poll_waddr)); | |
281 | init_poll_funcptr(&m->pt, p9_pollwait); | |
282 | break; | |
283 | } | |
284 | } | |
285 | } | |
286 | ||
287 | if (i >= ARRAY_SIZE(p9_mux_poll_tasks)) { | |
288 | if (vptlast == NULL) { | |
289 | mutex_unlock(&p9_mux_task_lock); | |
290 | return -ENOMEM; | |
291 | } | |
292 | ||
293 | P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i); | |
294 | list_add(&m->mux_list, &vptlast->mux_list); | |
295 | vptlast->muxnum++; | |
296 | m->poll_task = vptlast; | |
297 | memset(&m->poll_waddr, 0, sizeof(m->poll_waddr)); | |
298 | init_poll_funcptr(&m->pt, p9_pollwait); | |
299 | } | |
300 | ||
301 | p9_mux_num++; | |
302 | mutex_unlock(&p9_mux_task_lock); | |
303 | ||
304 | return 0; | |
305 | } | |
306 | ||
307 | static void p9_mux_poll_stop(struct p9_conn *m) | |
308 | { | |
309 | int i; | |
310 | struct p9_mux_poll_task *vpt; | |
311 | ||
312 | mutex_lock(&p9_mux_task_lock); | |
313 | vpt = m->poll_task; | |
314 | list_del(&m->mux_list); | |
315 | for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) { | |
316 | if (m->poll_waddr[i] != NULL) { | |
317 | remove_wait_queue(m->poll_waddr[i], &m->poll_wait[i]); | |
318 | m->poll_waddr[i] = NULL; | |
319 | } | |
320 | } | |
321 | vpt->muxnum--; | |
322 | if (!vpt->muxnum) { | |
323 | P9_DPRINTK(P9_DEBUG_MUX, "destroy proc %p\n", vpt); | |
324 | kthread_stop(vpt->task); | |
325 | vpt->task = NULL; | |
326 | p9_mux_poll_task_num--; | |
327 | } | |
328 | p9_mux_num--; | |
329 | mutex_unlock(&p9_mux_task_lock); | |
330 | } | |
331 | ||
332 | /** | |
333 | * p9_conn_create - allocate and initialize the per-session mux data | |
334 | * Creates the polling task if this is the first session. | |
335 | * | |
336 | * @trans - transport structure | |
337 | * @msize - maximum message size | |
338 | * @extended - extended flag | |
339 | */ | |
340 | static struct p9_conn *p9_conn_create(struct p9_trans *trans) | |
341 | { | |
342 | int i, n; | |
343 | struct p9_conn *m, *mtmp; | |
344 | ||
345 | P9_DPRINTK(P9_DEBUG_MUX, "transport %p msize %d\n", trans, | |
346 | trans->msize); | |
347 | m = kmalloc(sizeof(struct p9_conn), GFP_KERNEL); | |
348 | if (!m) | |
349 | return ERR_PTR(-ENOMEM); | |
350 | ||
351 | spin_lock_init(&m->lock); | |
352 | INIT_LIST_HEAD(&m->mux_list); | |
353 | m->msize = trans->msize; | |
354 | m->extended = trans->extended; | |
355 | m->trans = trans; | |
356 | m->tagpool = p9_idpool_create(); | |
357 | if (IS_ERR(m->tagpool)) { | |
358 | mtmp = ERR_PTR(-ENOMEM); | |
359 | kfree(m); | |
360 | return mtmp; | |
361 | } | |
362 | ||
363 | m->err = 0; | |
364 | init_waitqueue_head(&m->equeue); | |
365 | INIT_LIST_HEAD(&m->req_list); | |
366 | INIT_LIST_HEAD(&m->unsent_req_list); | |
367 | m->rcall = NULL; | |
368 | m->rpos = 0; | |
369 | m->rbuf = NULL; | |
370 | m->wpos = m->wsize = 0; | |
371 | m->wbuf = NULL; | |
372 | INIT_WORK(&m->rq, p9_read_work); | |
373 | INIT_WORK(&m->wq, p9_write_work); | |
374 | m->wsched = 0; | |
375 | memset(&m->poll_waddr, 0, sizeof(m->poll_waddr)); | |
376 | m->poll_task = NULL; | |
377 | n = p9_mux_poll_start(m); | |
378 | if (n) { | |
379 | kfree(m); | |
380 | return ERR_PTR(n); | |
381 | } | |
382 | ||
383 | n = p9_fd_poll(trans, &m->pt); | |
384 | if (n & POLLIN) { | |
385 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); | |
386 | set_bit(Rpending, &m->wsched); | |
387 | } | |
388 | ||
389 | if (n & POLLOUT) { | |
390 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); | |
391 | set_bit(Wpending, &m->wsched); | |
392 | } | |
393 | ||
394 | for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) { | |
395 | if (IS_ERR(m->poll_waddr[i])) { | |
396 | p9_mux_poll_stop(m); | |
397 | mtmp = (void *)m->poll_waddr; /* the error code */ | |
398 | kfree(m); | |
399 | m = mtmp; | |
400 | break; | |
401 | } | |
402 | } | |
403 | ||
404 | return m; | |
405 | } | |
406 | ||
407 | /** | |
408 | * p9_mux_destroy - cancels all pending requests and frees mux resources | |
409 | */ | |
410 | static void p9_conn_destroy(struct p9_conn *m) | |
411 | { | |
412 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m, | |
413 | m->mux_list.prev, m->mux_list.next); | |
414 | p9_conn_cancel(m, -ECONNRESET); | |
415 | ||
416 | if (!list_empty(&m->req_list)) { | |
417 | /* wait until all processes waiting on this session exit */ | |
418 | P9_DPRINTK(P9_DEBUG_MUX, | |
419 | "mux %p waiting for empty request queue\n", m); | |
420 | wait_event_timeout(m->equeue, (list_empty(&m->req_list)), 5000); | |
421 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p request queue empty: %d\n", m, | |
422 | list_empty(&m->req_list)); | |
423 | } | |
424 | ||
425 | p9_mux_poll_stop(m); | |
426 | m->trans = NULL; | |
427 | p9_idpool_destroy(m->tagpool); | |
428 | kfree(m); | |
429 | } | |
430 | ||
431 | /** | |
432 | * p9_pollwait - called by files poll operation to add v9fs-poll task | |
433 | * to files wait queue | |
434 | */ | |
435 | static void | |
436 | p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) | |
437 | { | |
438 | int i; | |
439 | struct p9_conn *m; | |
440 | ||
441 | m = container_of(p, struct p9_conn, pt); | |
442 | for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) | |
443 | if (m->poll_waddr[i] == NULL) | |
444 | break; | |
445 | ||
446 | if (i >= ARRAY_SIZE(m->poll_waddr)) { | |
447 | P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n"); | |
448 | return; | |
449 | } | |
450 | ||
451 | m->poll_waddr[i] = wait_address; | |
452 | ||
453 | if (!wait_address) { | |
454 | P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n"); | |
455 | m->poll_waddr[i] = ERR_PTR(-EIO); | |
456 | return; | |
457 | } | |
458 | ||
459 | init_waitqueue_entry(&m->poll_wait[i], m->poll_task->task); | |
460 | add_wait_queue(wait_address, &m->poll_wait[i]); | |
461 | } | |
462 | ||
463 | /** | |
464 | * p9_poll_mux - polls a mux and schedules read or write works if necessary | |
465 | */ | |
466 | static void p9_poll_mux(struct p9_conn *m) | |
467 | { | |
468 | int n; | |
469 | ||
470 | if (m->err < 0) | |
471 | return; | |
472 | ||
473 | n = p9_fd_poll(m->trans, NULL); | |
474 | if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { | |
475 | P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n); | |
476 | if (n >= 0) | |
477 | n = -ECONNRESET; | |
478 | p9_conn_cancel(m, n); | |
479 | } | |
480 | ||
481 | if (n & POLLIN) { | |
482 | set_bit(Rpending, &m->wsched); | |
483 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); | |
484 | if (!test_and_set_bit(Rworksched, &m->wsched)) { | |
485 | P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); | |
486 | queue_work(p9_mux_wq, &m->rq); | |
487 | } | |
488 | } | |
489 | ||
490 | if (n & POLLOUT) { | |
491 | set_bit(Wpending, &m->wsched); | |
492 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); | |
493 | if ((m->wsize || !list_empty(&m->unsent_req_list)) | |
494 | && !test_and_set_bit(Wworksched, &m->wsched)) { | |
495 | P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); | |
496 | queue_work(p9_mux_wq, &m->wq); | |
497 | } | |
498 | } | |
499 | } | |
500 | ||
501 | /** | |
502 | * p9_poll_proc - polls all v9fs transports for new events and queues | |
503 | * the appropriate work to the work queue | |
504 | */ | |
505 | static int p9_poll_proc(void *a) | |
506 | { | |
507 | struct p9_conn *m, *mtmp; | |
508 | struct p9_mux_poll_task *vpt; | |
509 | ||
510 | vpt = a; | |
511 | P9_DPRINTK(P9_DEBUG_MUX, "start %p %p\n", current, vpt); | |
512 | while (!kthread_should_stop()) { | |
513 | set_current_state(TASK_INTERRUPTIBLE); | |
514 | ||
515 | list_for_each_entry_safe(m, mtmp, &vpt->mux_list, mux_list) { | |
516 | p9_poll_mux(m); | |
517 | } | |
518 | ||
519 | P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n"); | |
520 | schedule_timeout(SCHED_TIMEOUT * HZ); | |
521 | } | |
522 | ||
523 | __set_current_state(TASK_RUNNING); | |
524 | P9_DPRINTK(P9_DEBUG_MUX, "finish\n"); | |
525 | return 0; | |
526 | } | |
527 | ||
528 | /** | |
529 | * p9_write_work - called when a transport can send some data | |
530 | */ | |
531 | static void p9_write_work(struct work_struct *work) | |
532 | { | |
533 | int n, err; | |
534 | struct p9_conn *m; | |
535 | struct p9_req *req; | |
536 | ||
537 | m = container_of(work, struct p9_conn, wq); | |
538 | ||
539 | if (m->err < 0) { | |
540 | clear_bit(Wworksched, &m->wsched); | |
541 | return; | |
542 | } | |
543 | ||
544 | if (!m->wsize) { | |
545 | if (list_empty(&m->unsent_req_list)) { | |
546 | clear_bit(Wworksched, &m->wsched); | |
547 | return; | |
548 | } | |
549 | ||
550 | spin_lock(&m->lock); | |
551 | again: | |
552 | req = list_entry(m->unsent_req_list.next, struct p9_req, | |
553 | req_list); | |
554 | list_move_tail(&req->req_list, &m->req_list); | |
555 | if (req->err == ERREQFLUSH) | |
556 | goto again; | |
557 | ||
558 | m->wbuf = req->tcall->sdata; | |
559 | m->wsize = req->tcall->size; | |
560 | m->wpos = 0; | |
561 | spin_unlock(&m->lock); | |
562 | } | |
563 | ||
564 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos, | |
565 | m->wsize); | |
566 | clear_bit(Wpending, &m->wsched); | |
567 | err = p9_fd_write(m->trans, m->wbuf + m->wpos, m->wsize - m->wpos); | |
568 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err); | |
569 | if (err == -EAGAIN) { | |
570 | clear_bit(Wworksched, &m->wsched); | |
571 | return; | |
572 | } | |
573 | ||
574 | if (err < 0) | |
575 | goto error; | |
576 | else if (err == 0) { | |
577 | err = -EREMOTEIO; | |
578 | goto error; | |
579 | } | |
580 | ||
581 | m->wpos += err; | |
582 | if (m->wpos == m->wsize) | |
583 | m->wpos = m->wsize = 0; | |
584 | ||
585 | if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) { | |
586 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
587 | n = POLLOUT; | |
588 | else | |
589 | n = p9_fd_poll(m->trans, NULL); | |
590 | ||
591 | if (n & POLLOUT) { | |
592 | P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); | |
593 | queue_work(p9_mux_wq, &m->wq); | |
594 | } else | |
595 | clear_bit(Wworksched, &m->wsched); | |
596 | } else | |
597 | clear_bit(Wworksched, &m->wsched); | |
598 | ||
599 | return; | |
600 | ||
601 | error: | |
602 | p9_conn_cancel(m, err); | |
603 | clear_bit(Wworksched, &m->wsched); | |
604 | } | |
605 | ||
606 | static void process_request(struct p9_conn *m, struct p9_req *req) | |
607 | { | |
608 | int ecode; | |
609 | struct p9_str *ename; | |
610 | ||
611 | if (!req->err && req->rcall->id == P9_RERROR) { | |
612 | ecode = req->rcall->params.rerror.errno; | |
613 | ename = &req->rcall->params.rerror.error; | |
614 | ||
615 | P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len, | |
616 | ename->str); | |
617 | ||
618 | if (m->extended) | |
619 | req->err = -ecode; | |
620 | ||
621 | if (!req->err) { | |
622 | req->err = p9_errstr2errno(ename->str, ename->len); | |
623 | ||
624 | /* string match failed */ | |
625 | if (!req->err) { | |
626 | PRINT_FCALL_ERROR("unknown error", req->rcall); | |
627 | req->err = -ESERVERFAULT; | |
628 | } | |
629 | } | |
630 | } else if (req->tcall && req->rcall->id != req->tcall->id + 1) { | |
631 | P9_DPRINTK(P9_DEBUG_ERROR, | |
632 | "fcall mismatch: expected %d, got %d\n", | |
633 | req->tcall->id + 1, req->rcall->id); | |
634 | if (!req->err) | |
635 | req->err = -EIO; | |
636 | } | |
637 | } | |
638 | ||
639 | /** | |
640 | * p9_read_work - called when there is some data to be read from a transport | |
641 | */ | |
642 | static void p9_read_work(struct work_struct *work) | |
643 | { | |
644 | int n, err; | |
645 | struct p9_conn *m; | |
646 | struct p9_req *req, *rptr, *rreq; | |
647 | struct p9_fcall *rcall; | |
648 | char *rbuf; | |
649 | ||
650 | m = container_of(work, struct p9_conn, rq); | |
651 | ||
652 | if (m->err < 0) | |
653 | return; | |
654 | ||
655 | rcall = NULL; | |
656 | P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos); | |
657 | ||
658 | if (!m->rcall) { | |
659 | m->rcall = | |
660 | kmalloc(sizeof(struct p9_fcall) + m->msize, GFP_KERNEL); | |
661 | if (!m->rcall) { | |
662 | err = -ENOMEM; | |
663 | goto error; | |
664 | } | |
665 | ||
666 | m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall); | |
667 | m->rpos = 0; | |
668 | } | |
669 | ||
670 | clear_bit(Rpending, &m->wsched); | |
671 | err = p9_fd_read(m->trans, m->rbuf + m->rpos, m->msize - m->rpos); | |
672 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err); | |
673 | if (err == -EAGAIN) { | |
674 | clear_bit(Rworksched, &m->wsched); | |
675 | return; | |
676 | } | |
677 | ||
678 | if (err <= 0) | |
679 | goto error; | |
680 | ||
681 | m->rpos += err; | |
682 | while (m->rpos > 4) { | |
683 | n = le32_to_cpu(*(__le32 *) m->rbuf); | |
684 | if (n >= m->msize) { | |
685 | P9_DPRINTK(P9_DEBUG_ERROR, | |
686 | "requested packet size too big: %d\n", n); | |
687 | err = -EIO; | |
688 | goto error; | |
689 | } | |
690 | ||
691 | if (m->rpos < n) | |
692 | break; | |
693 | ||
694 | err = | |
695 | p9_deserialize_fcall(m->rbuf, n, m->rcall, m->extended); | |
696 | if (err < 0) | |
697 | goto error; | |
698 | ||
699 | #ifdef CONFIG_NET_9P_DEBUG | |
700 | if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { | |
701 | char buf[150]; | |
702 | ||
703 | p9_printfcall(buf, sizeof(buf), m->rcall, | |
704 | m->extended); | |
705 | printk(KERN_NOTICE ">>> %p %s\n", m, buf); | |
706 | } | |
707 | #endif | |
708 | ||
709 | rcall = m->rcall; | |
710 | rbuf = m->rbuf; | |
711 | if (m->rpos > n) { | |
712 | m->rcall = kmalloc(sizeof(struct p9_fcall) + m->msize, | |
713 | GFP_KERNEL); | |
714 | if (!m->rcall) { | |
715 | err = -ENOMEM; | |
716 | goto error; | |
717 | } | |
718 | ||
719 | m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall); | |
720 | memmove(m->rbuf, rbuf + n, m->rpos - n); | |
721 | m->rpos -= n; | |
722 | } else { | |
723 | m->rcall = NULL; | |
724 | m->rbuf = NULL; | |
725 | m->rpos = 0; | |
726 | } | |
727 | ||
728 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m, | |
729 | rcall->id, rcall->tag); | |
730 | ||
731 | req = NULL; | |
732 | spin_lock(&m->lock); | |
733 | list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) { | |
734 | if (rreq->tag == rcall->tag) { | |
735 | req = rreq; | |
736 | if (req->flush != Flushing) | |
737 | list_del(&req->req_list); | |
738 | break; | |
739 | } | |
740 | } | |
741 | spin_unlock(&m->lock); | |
742 | ||
743 | if (req) { | |
744 | req->rcall = rcall; | |
745 | process_request(m, req); | |
746 | ||
747 | if (req->flush != Flushing) { | |
748 | if (req->cb) | |
749 | (*req->cb) (req, req->cba); | |
750 | else | |
751 | kfree(req->rcall); | |
752 | ||
753 | wake_up(&m->equeue); | |
754 | } | |
755 | } else { | |
756 | if (err >= 0 && rcall->id != P9_RFLUSH) | |
757 | P9_DPRINTK(P9_DEBUG_ERROR, | |
758 | "unexpected response mux %p id %d tag %d\n", | |
759 | m, rcall->id, rcall->tag); | |
760 | kfree(rcall); | |
761 | } | |
762 | } | |
763 | ||
764 | if (!list_empty(&m->req_list)) { | |
765 | if (test_and_clear_bit(Rpending, &m->wsched)) | |
766 | n = POLLIN; | |
767 | else | |
768 | n = p9_fd_poll(m->trans, NULL); | |
769 | ||
770 | if (n & POLLIN) { | |
771 | P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); | |
772 | queue_work(p9_mux_wq, &m->rq); | |
773 | } else | |
774 | clear_bit(Rworksched, &m->wsched); | |
775 | } else | |
776 | clear_bit(Rworksched, &m->wsched); | |
777 | ||
778 | return; | |
779 | ||
780 | error: | |
781 | p9_conn_cancel(m, err); | |
782 | clear_bit(Rworksched, &m->wsched); | |
783 | } | |
784 | ||
785 | /** | |
786 | * p9_send_request - send 9P request | |
787 | * The function can sleep until the request is scheduled for sending. | |
788 | * The function can be interrupted. Return from the function is not | |
789 | * a guarantee that the request is sent successfully. Can return errors | |
790 | * that can be retrieved by PTR_ERR macros. | |
791 | * | |
792 | * @m: mux data | |
793 | * @tc: request to be sent | |
794 | * @cb: callback function to call when response is received | |
795 | * @cba: parameter to pass to the callback function | |
796 | */ | |
797 | static struct p9_req *p9_send_request(struct p9_conn *m, | |
798 | struct p9_fcall *tc, | |
799 | p9_conn_req_callback cb, void *cba) | |
800 | { | |
801 | int n; | |
802 | struct p9_req *req; | |
803 | ||
804 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current, | |
805 | tc, tc->id); | |
806 | if (m->err < 0) | |
807 | return ERR_PTR(m->err); | |
808 | ||
809 | req = kmalloc(sizeof(struct p9_req), GFP_KERNEL); | |
810 | if (!req) | |
811 | return ERR_PTR(-ENOMEM); | |
812 | ||
813 | if (tc->id == P9_TVERSION) | |
814 | n = P9_NOTAG; | |
815 | else | |
816 | n = p9_mux_get_tag(m); | |
817 | ||
818 | if (n < 0) | |
819 | return ERR_PTR(-ENOMEM); | |
820 | ||
821 | p9_set_tag(tc, n); | |
822 | ||
823 | #ifdef CONFIG_NET_9P_DEBUG | |
824 | if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { | |
825 | char buf[150]; | |
826 | ||
827 | p9_printfcall(buf, sizeof(buf), tc, m->extended); | |
828 | printk(KERN_NOTICE "<<< %p %s\n", m, buf); | |
829 | } | |
830 | #endif | |
831 | ||
832 | spin_lock_init(&req->lock); | |
833 | req->tag = n; | |
834 | req->tcall = tc; | |
835 | req->rcall = NULL; | |
836 | req->err = 0; | |
837 | req->cb = cb; | |
838 | req->cba = cba; | |
839 | req->flush = None; | |
840 | ||
841 | spin_lock(&m->lock); | |
842 | list_add_tail(&req->req_list, &m->unsent_req_list); | |
843 | spin_unlock(&m->lock); | |
844 | ||
845 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
846 | n = POLLOUT; | |
847 | else | |
848 | n = p9_fd_poll(m->trans, NULL); | |
849 | ||
850 | if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) | |
851 | queue_work(p9_mux_wq, &m->wq); | |
852 | ||
853 | return req; | |
854 | } | |
855 | ||
856 | static void p9_mux_free_request(struct p9_conn *m, struct p9_req *req) | |
857 | { | |
858 | p9_mux_put_tag(m, req->tag); | |
859 | kfree(req); | |
860 | } | |
861 | ||
862 | static void p9_mux_flush_cb(struct p9_req *freq, void *a) | |
863 | { | |
8a0dc95f EVH |
864 | int tag; |
865 | struct p9_conn *m; | |
866 | struct p9_req *req, *rreq, *rptr; | |
867 | ||
868 | m = a; | |
869 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m, | |
870 | freq->tcall, freq->rcall, freq->err, | |
871 | freq->tcall->params.tflush.oldtag); | |
872 | ||
873 | spin_lock(&m->lock); | |
8a0dc95f EVH |
874 | tag = freq->tcall->params.tflush.oldtag; |
875 | req = NULL; | |
876 | list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) { | |
877 | if (rreq->tag == tag) { | |
878 | req = rreq; | |
879 | list_del(&req->req_list); | |
880 | break; | |
881 | } | |
882 | } | |
883 | spin_unlock(&m->lock); | |
884 | ||
885 | if (req) { | |
886 | spin_lock(&req->lock); | |
887 | req->flush = Flushed; | |
888 | spin_unlock(&req->lock); | |
889 | ||
890 | if (req->cb) | |
891 | (*req->cb) (req, req->cba); | |
892 | else | |
893 | kfree(req->rcall); | |
894 | ||
895 | wake_up(&m->equeue); | |
896 | } | |
897 | ||
898 | kfree(freq->tcall); | |
899 | kfree(freq->rcall); | |
900 | p9_mux_free_request(m, freq); | |
901 | } | |
902 | ||
903 | static int | |
904 | p9_mux_flush_request(struct p9_conn *m, struct p9_req *req) | |
905 | { | |
906 | struct p9_fcall *fc; | |
907 | struct p9_req *rreq, *rptr; | |
908 | ||
909 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag); | |
910 | ||
911 | /* if a response was received for a request, do nothing */ | |
912 | spin_lock(&req->lock); | |
913 | if (req->rcall || req->err) { | |
914 | spin_unlock(&req->lock); | |
915 | P9_DPRINTK(P9_DEBUG_MUX, | |
916 | "mux %p req %p response already received\n", m, req); | |
917 | return 0; | |
918 | } | |
919 | ||
920 | req->flush = Flushing; | |
921 | spin_unlock(&req->lock); | |
922 | ||
923 | spin_lock(&m->lock); | |
924 | /* if the request is not sent yet, just remove it from the list */ | |
925 | list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) { | |
926 | if (rreq->tag == req->tag) { | |
927 | P9_DPRINTK(P9_DEBUG_MUX, | |
928 | "mux %p req %p request is not sent yet\n", m, req); | |
929 | list_del(&rreq->req_list); | |
930 | req->flush = Flushed; | |
931 | spin_unlock(&m->lock); | |
932 | if (req->cb) | |
933 | (*req->cb) (req, req->cba); | |
934 | return 0; | |
935 | } | |
936 | } | |
937 | spin_unlock(&m->lock); | |
938 | ||
939 | clear_thread_flag(TIF_SIGPENDING); | |
940 | fc = p9_create_tflush(req->tag); | |
941 | p9_send_request(m, fc, p9_mux_flush_cb, m); | |
942 | return 1; | |
943 | } | |
944 | ||
945 | static void | |
946 | p9_conn_rpc_cb(struct p9_req *req, void *a) | |
947 | { | |
948 | struct p9_mux_rpc *r; | |
949 | ||
950 | P9_DPRINTK(P9_DEBUG_MUX, "req %p r %p\n", req, a); | |
951 | r = a; | |
952 | r->rcall = req->rcall; | |
953 | r->err = req->err; | |
954 | ||
955 | if (req->flush != None && !req->err) | |
956 | r->err = -ERESTARTSYS; | |
957 | ||
958 | wake_up(&r->wqueue); | |
959 | } | |
960 | ||
961 | /** | |
962 | * p9_fd_rpc- sends 9P request and waits until a response is available. | |
963 | * The function can be interrupted. | |
964 | * @m: mux data | |
965 | * @tc: request to be sent | |
966 | * @rc: pointer where a pointer to the response is stored | |
967 | */ | |
968 | int | |
969 | p9_fd_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc) | |
970 | { | |
971 | struct p9_trans_fd *p = t->priv; | |
972 | struct p9_conn *m = p->conn; | |
973 | int err, sigpending; | |
974 | unsigned long flags; | |
975 | struct p9_req *req; | |
976 | struct p9_mux_rpc r; | |
977 | ||
978 | r.err = 0; | |
979 | r.tcall = tc; | |
980 | r.rcall = NULL; | |
981 | r.m = m; | |
982 | init_waitqueue_head(&r.wqueue); | |
983 | ||
984 | if (rc) | |
985 | *rc = NULL; | |
986 | ||
987 | sigpending = 0; | |
988 | if (signal_pending(current)) { | |
989 | sigpending = 1; | |
990 | clear_thread_flag(TIF_SIGPENDING); | |
991 | } | |
992 | ||
993 | req = p9_send_request(m, tc, p9_conn_rpc_cb, &r); | |
994 | if (IS_ERR(req)) { | |
995 | err = PTR_ERR(req); | |
996 | P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err); | |
997 | return err; | |
998 | } | |
999 | ||
1000 | err = wait_event_interruptible(r.wqueue, r.rcall != NULL || r.err < 0); | |
1001 | if (r.err < 0) | |
1002 | err = r.err; | |
1003 | ||
1004 | if (err == -ERESTARTSYS && m->trans->status == Connected | |
1005 | && m->err == 0) { | |
1006 | if (p9_mux_flush_request(m, req)) { | |
1007 | /* wait until we get response of the flush message */ | |
1008 | do { | |
1009 | clear_thread_flag(TIF_SIGPENDING); | |
1010 | err = wait_event_interruptible(r.wqueue, | |
1011 | r.rcall || r.err); | |
1012 | } while (!r.rcall && !r.err && err == -ERESTARTSYS && | |
1013 | m->trans->status == Connected && !m->err); | |
1014 | ||
1015 | err = -ERESTARTSYS; | |
1016 | } | |
1017 | sigpending = 1; | |
1018 | } | |
1019 | ||
1020 | if (sigpending) { | |
1021 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
1022 | recalc_sigpending(); | |
1023 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
1024 | } | |
1025 | ||
1026 | if (rc) | |
1027 | *rc = r.rcall; | |
1028 | else | |
1029 | kfree(r.rcall); | |
1030 | ||
1031 | p9_mux_free_request(m, req); | |
1032 | if (err > 0) | |
1033 | err = -EIO; | |
1034 | ||
1035 | return err; | |
1036 | } | |
1037 | ||
1038 | #ifdef P9_NONBLOCK | |
1039 | /** | |
1040 | * p9_conn_rpcnb - sends 9P request without waiting for response. | |
1041 | * @m: mux data | |
1042 | * @tc: request to be sent | |
1043 | * @cb: callback function to be called when response arrives | |
1044 | * @cba: value to pass to the callback function | |
1045 | */ | |
1046 | int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc, | |
1047 | p9_conn_req_callback cb, void *a) | |
1048 | { | |
1049 | int err; | |
1050 | struct p9_req *req; | |
1051 | ||
1052 | req = p9_send_request(m, tc, cb, a); | |
1053 | if (IS_ERR(req)) { | |
1054 | err = PTR_ERR(req); | |
1055 | P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err); | |
1056 | return PTR_ERR(req); | |
1057 | } | |
1058 | ||
1059 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag); | |
1060 | return 0; | |
1061 | } | |
1062 | #endif /* P9_NONBLOCK */ | |
1063 | ||
1064 | /** | |
1065 | * p9_conn_cancel - cancel all pending requests with error | |
1066 | * @m: mux data | |
1067 | * @err: error code | |
1068 | */ | |
1069 | void p9_conn_cancel(struct p9_conn *m, int err) | |
1070 | { | |
1071 | struct p9_req *req, *rtmp; | |
1072 | LIST_HEAD(cancel_list); | |
1073 | ||
1074 | P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); | |
1075 | m->err = err; | |
1076 | spin_lock(&m->lock); | |
1077 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { | |
1078 | list_move(&req->req_list, &cancel_list); | |
1079 | } | |
1080 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { | |
1081 | list_move(&req->req_list, &cancel_list); | |
1082 | } | |
1083 | spin_unlock(&m->lock); | |
1084 | ||
1085 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { | |
1086 | list_del(&req->req_list); | |
1087 | if (!req->err) | |
1088 | req->err = err; | |
1089 | ||
1090 | if (req->cb) | |
1091 | (*req->cb) (req, req->cba); | |
1092 | else | |
1093 | kfree(req->rcall); | |
1094 | } | |
1095 | ||
1096 | wake_up(&m->equeue); | |
1097 | } | |
1098 | ||
a80d923e EVH |
1099 | /** |
1100 | * v9fs_parse_options - parse mount options into session structure | |
1101 | * @options: options string passed from mount | |
1102 | * @v9ses: existing v9fs session information | |
1103 | * | |
1104 | */ | |
bd238fb4 | 1105 | |
a80d923e | 1106 | static void parse_opts(char *options, struct p9_fd_opts *opts) |
bd238fb4 | 1107 | { |
a80d923e EVH |
1108 | char *p; |
1109 | substring_t args[MAX_OPT_ARGS]; | |
1110 | int option; | |
1111 | int ret; | |
bd238fb4 | 1112 | |
a80d923e EVH |
1113 | opts->port = P9_PORT; |
1114 | opts->rfd = ~0; | |
1115 | opts->wfd = ~0; | |
bd238fb4 | 1116 | |
a80d923e EVH |
1117 | if (!options) |
1118 | return; | |
bd238fb4 | 1119 | |
a80d923e EVH |
1120 | while ((p = strsep(&options, ",")) != NULL) { |
1121 | int token; | |
1122 | if (!*p) | |
1123 | continue; | |
1124 | token = match_token(p, tokens, args); | |
1125 | ret = match_int(&args[0], &option); | |
1126 | if (ret < 0) { | |
1127 | P9_DPRINTK(P9_DEBUG_ERROR, | |
1128 | "integer field, but no integer?\n"); | |
1129 | continue; | |
1130 | } | |
1131 | switch (token) { | |
1132 | case Opt_port: | |
1133 | opts->port = option; | |
1134 | break; | |
1135 | case Opt_rfdno: | |
1136 | opts->rfd = option; | |
1137 | break; | |
1138 | case Opt_wfdno: | |
1139 | opts->wfd = option; | |
1140 | break; | |
1141 | default: | |
1142 | continue; | |
1143 | } | |
bd238fb4 | 1144 | } |
bd238fb4 | 1145 | } |
bd238fb4 | 1146 | |
a80d923e | 1147 | static int p9_fd_open(struct p9_trans *trans, int rfd, int wfd) |
bd238fb4 | 1148 | { |
a80d923e EVH |
1149 | struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), |
1150 | GFP_KERNEL); | |
1151 | if (!ts) | |
1152 | return -ENOMEM; | |
bd238fb4 | 1153 | |
a80d923e EVH |
1154 | ts->rd = fget(rfd); |
1155 | ts->wr = fget(wfd); | |
1156 | if (!ts->rd || !ts->wr) { | |
1157 | if (ts->rd) | |
1158 | fput(ts->rd); | |
1159 | if (ts->wr) | |
1160 | fput(ts->wr); | |
1161 | kfree(ts); | |
1162 | return -EIO; | |
bd238fb4 LI |
1163 | } |
1164 | ||
a80d923e EVH |
1165 | trans->priv = ts; |
1166 | trans->status = Connected; | |
bd238fb4 | 1167 | |
a80d923e | 1168 | return 0; |
bd238fb4 | 1169 | } |
bd238fb4 | 1170 | |
a80d923e | 1171 | static int p9_socket_open(struct p9_trans *trans, struct socket *csocket) |
bd238fb4 LI |
1172 | { |
1173 | int fd, ret; | |
1174 | ||
1175 | csocket->sk->sk_allocation = GFP_NOIO; | |
1176 | fd = sock_map_fd(csocket); | |
1177 | if (fd < 0) { | |
1178 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n"); | |
1179 | return fd; | |
1180 | } | |
1181 | ||
1182 | ret = p9_fd_open(trans, fd, fd); | |
1183 | if (ret < 0) { | |
1184 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n"); | |
1185 | sockfd_put(csocket); | |
1186 | return ret; | |
1187 | } | |
1188 | ||
1189 | ((struct p9_trans_fd *)trans->priv)->rd->f_flags |= O_NONBLOCK; | |
1190 | ||
1191 | return 0; | |
1192 | } | |
1193 | ||
bd238fb4 LI |
1194 | /** |
1195 | * p9_fd_read- read from a fd | |
1196 | * @v9ses: session information | |
1197 | * @v: buffer to receive data into | |
1198 | * @len: size of receive buffer | |
1199 | * | |
1200 | */ | |
a80d923e | 1201 | static int p9_fd_read(struct p9_trans *trans, void *v, int len) |
bd238fb4 LI |
1202 | { |
1203 | int ret; | |
1204 | struct p9_trans_fd *ts = NULL; | |
1205 | ||
1206 | if (trans && trans->status != Disconnected) | |
1207 | ts = trans->priv; | |
1208 | ||
1209 | if (!ts) | |
1210 | return -EREMOTEIO; | |
1211 | ||
1212 | if (!(ts->rd->f_flags & O_NONBLOCK)) | |
1213 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n"); | |
1214 | ||
1215 | ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); | |
1216 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
1217 | trans->status = Disconnected; | |
1218 | return ret; | |
1219 | } | |
1220 | ||
1221 | /** | |
1222 | * p9_fd_write - write to a socket | |
1223 | * @v9ses: session information | |
1224 | * @v: buffer to send data from | |
1225 | * @len: size of send buffer | |
1226 | * | |
1227 | */ | |
a80d923e | 1228 | static int p9_fd_write(struct p9_trans *trans, void *v, int len) |
bd238fb4 LI |
1229 | { |
1230 | int ret; | |
1231 | mm_segment_t oldfs; | |
1232 | struct p9_trans_fd *ts = NULL; | |
1233 | ||
1234 | if (trans && trans->status != Disconnected) | |
1235 | ts = trans->priv; | |
1236 | ||
1237 | if (!ts) | |
1238 | return -EREMOTEIO; | |
1239 | ||
1240 | if (!(ts->wr->f_flags & O_NONBLOCK)) | |
1241 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n"); | |
1242 | ||
1243 | oldfs = get_fs(); | |
1244 | set_fs(get_ds()); | |
1245 | /* The cast to a user pointer is valid due to the set_fs() */ | |
1246 | ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos); | |
1247 | set_fs(oldfs); | |
1248 | ||
1249 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
1250 | trans->status = Disconnected; | |
1251 | return ret; | |
1252 | } | |
1253 | ||
1254 | static unsigned int | |
a80d923e | 1255 | p9_fd_poll(struct p9_trans *trans, struct poll_table_struct *pt) |
bd238fb4 LI |
1256 | { |
1257 | int ret, n; | |
1258 | struct p9_trans_fd *ts = NULL; | |
1259 | mm_segment_t oldfs; | |
1260 | ||
1261 | if (trans && trans->status == Connected) | |
1262 | ts = trans->priv; | |
1263 | ||
1264 | if (!ts) | |
1265 | return -EREMOTEIO; | |
1266 | ||
1267 | if (!ts->rd->f_op || !ts->rd->f_op->poll) | |
1268 | return -EIO; | |
1269 | ||
1270 | if (!ts->wr->f_op || !ts->wr->f_op->poll) | |
1271 | return -EIO; | |
1272 | ||
1273 | oldfs = get_fs(); | |
1274 | set_fs(get_ds()); | |
1275 | ||
1276 | ret = ts->rd->f_op->poll(ts->rd, pt); | |
1277 | if (ret < 0) | |
1278 | goto end; | |
1279 | ||
1280 | if (ts->rd != ts->wr) { | |
1281 | n = ts->wr->f_op->poll(ts->wr, pt); | |
1282 | if (n < 0) { | |
1283 | ret = n; | |
1284 | goto end; | |
1285 | } | |
1286 | ret = (ret & ~POLLOUT) | (n & ~POLLIN); | |
1287 | } | |
1288 | ||
1289 | end: | |
1290 | set_fs(oldfs); | |
1291 | return ret; | |
1292 | } | |
1293 | ||
1294 | /** | |
8a0dc95f | 1295 | * p9_fd_close - shutdown socket |
bd238fb4 LI |
1296 | * @trans: private socket structure |
1297 | * | |
1298 | */ | |
a80d923e | 1299 | static void p9_fd_close(struct p9_trans *trans) |
bd238fb4 LI |
1300 | { |
1301 | struct p9_trans_fd *ts; | |
1302 | ||
1303 | if (!trans) | |
1304 | return; | |
1305 | ||
1306 | ts = xchg(&trans->priv, NULL); | |
1307 | ||
1308 | if (!ts) | |
1309 | return; | |
1310 | ||
8a0dc95f EVH |
1311 | p9_conn_destroy(ts->conn); |
1312 | ||
bd238fb4 LI |
1313 | trans->status = Disconnected; |
1314 | if (ts->rd) | |
1315 | fput(ts->rd); | |
1316 | if (ts->wr) | |
1317 | fput(ts->wr); | |
1318 | kfree(ts); | |
1319 | } | |
1320 | ||
8a0dc95f EVH |
1321 | static struct p9_trans * |
1322 | p9_trans_create_tcp(const char *addr, char *args, int msize, unsigned char dotu) | |
a80d923e EVH |
1323 | { |
1324 | int err; | |
1325 | struct p9_trans *trans; | |
1326 | struct socket *csocket; | |
1327 | struct sockaddr_in sin_server; | |
1328 | struct p9_fd_opts opts; | |
8a0dc95f | 1329 | struct p9_trans_fd *p; |
a80d923e EVH |
1330 | |
1331 | parse_opts(args, &opts); | |
1332 | ||
1333 | csocket = NULL; | |
1334 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); | |
1335 | if (!trans) | |
1336 | return ERR_PTR(-ENOMEM); | |
8a0dc95f EVH |
1337 | trans->msize = msize; |
1338 | trans->extended = dotu; | |
1339 | trans->rpc = p9_fd_rpc; | |
a80d923e | 1340 | trans->close = p9_fd_close; |
a80d923e EVH |
1341 | |
1342 | sin_server.sin_family = AF_INET; | |
1343 | sin_server.sin_addr.s_addr = in_aton(addr); | |
1344 | sin_server.sin_port = htons(opts.port); | |
1345 | sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket); | |
1346 | ||
1347 | if (!csocket) { | |
1348 | P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n"); | |
1349 | err = -EIO; | |
1350 | goto error; | |
1351 | } | |
1352 | ||
1353 | err = csocket->ops->connect(csocket, | |
1354 | (struct sockaddr *)&sin_server, | |
1355 | sizeof(struct sockaddr_in), 0); | |
1356 | if (err < 0) { | |
1357 | P9_EPRINTK(KERN_ERR, | |
1358 | "p9_trans_tcp: problem connecting socket to %s\n", | |
1359 | addr); | |
1360 | goto error; | |
1361 | } | |
1362 | ||
1363 | err = p9_socket_open(trans, csocket); | |
1364 | if (err < 0) | |
1365 | goto error; | |
1366 | ||
8a0dc95f EVH |
1367 | p = (struct p9_trans_fd *) trans->priv; |
1368 | p->conn = p9_conn_create(trans); | |
1369 | if (IS_ERR(p->conn)) { | |
1370 | err = PTR_ERR(p->conn); | |
1371 | p->conn = NULL; | |
1372 | goto error; | |
1373 | } | |
1374 | ||
a80d923e EVH |
1375 | return trans; |
1376 | ||
1377 | error: | |
1378 | if (csocket) | |
1379 | sock_release(csocket); | |
1380 | ||
1381 | kfree(trans); | |
1382 | return ERR_PTR(err); | |
1383 | } | |
1384 | ||
8a0dc95f EVH |
1385 | static struct p9_trans * |
1386 | p9_trans_create_unix(const char *addr, char *args, int msize, | |
1387 | unsigned char dotu) | |
a80d923e EVH |
1388 | { |
1389 | int err; | |
1390 | struct socket *csocket; | |
1391 | struct sockaddr_un sun_server; | |
1392 | struct p9_trans *trans; | |
8a0dc95f | 1393 | struct p9_trans_fd *p; |
a80d923e EVH |
1394 | |
1395 | csocket = NULL; | |
1396 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); | |
1397 | if (!trans) | |
1398 | return ERR_PTR(-ENOMEM); | |
1399 | ||
8a0dc95f | 1400 | trans->rpc = p9_fd_rpc; |
a80d923e | 1401 | trans->close = p9_fd_close; |
a80d923e EVH |
1402 | |
1403 | if (strlen(addr) > UNIX_PATH_MAX) { | |
1404 | P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n", | |
1405 | addr); | |
1406 | err = -ENAMETOOLONG; | |
1407 | goto error; | |
1408 | } | |
1409 | ||
1410 | sun_server.sun_family = PF_UNIX; | |
1411 | strcpy(sun_server.sun_path, addr); | |
1412 | sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket); | |
1413 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, | |
1414 | sizeof(struct sockaddr_un) - 1, 0); | |
1415 | if (err < 0) { | |
1416 | P9_EPRINTK(KERN_ERR, | |
1417 | "p9_trans_unix: problem connecting socket: %s: %d\n", | |
1418 | addr, err); | |
1419 | goto error; | |
1420 | } | |
1421 | ||
1422 | err = p9_socket_open(trans, csocket); | |
1423 | if (err < 0) | |
1424 | goto error; | |
1425 | ||
8a0dc95f EVH |
1426 | trans->msize = msize; |
1427 | trans->extended = dotu; | |
1428 | p = (struct p9_trans_fd *) trans->priv; | |
1429 | p->conn = p9_conn_create(trans); | |
1430 | if (IS_ERR(p->conn)) { | |
1431 | err = PTR_ERR(p->conn); | |
1432 | p->conn = NULL; | |
1433 | goto error; | |
1434 | } | |
1435 | ||
a80d923e EVH |
1436 | return trans; |
1437 | ||
1438 | error: | |
1439 | if (csocket) | |
1440 | sock_release(csocket); | |
1441 | ||
1442 | kfree(trans); | |
1443 | return ERR_PTR(err); | |
1444 | } | |
1445 | ||
8a0dc95f EVH |
1446 | static struct p9_trans * |
1447 | p9_trans_create_fd(const char *name, char *args, int msize, | |
1448 | unsigned char extended) | |
a80d923e EVH |
1449 | { |
1450 | int err; | |
1451 | struct p9_trans *trans; | |
1452 | struct p9_fd_opts opts; | |
8a0dc95f | 1453 | struct p9_trans_fd *p; |
a80d923e EVH |
1454 | |
1455 | parse_opts(args, &opts); | |
1456 | ||
1457 | if (opts.rfd == ~0 || opts.wfd == ~0) { | |
1458 | printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); | |
1459 | return ERR_PTR(-ENOPROTOOPT); | |
1460 | } | |
1461 | ||
1462 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); | |
1463 | if (!trans) | |
1464 | return ERR_PTR(-ENOMEM); | |
1465 | ||
8a0dc95f | 1466 | trans->rpc = p9_fd_rpc; |
a80d923e | 1467 | trans->close = p9_fd_close; |
a80d923e EVH |
1468 | |
1469 | err = p9_fd_open(trans, opts.rfd, opts.wfd); | |
1470 | if (err < 0) | |
1471 | goto error; | |
1472 | ||
8a0dc95f EVH |
1473 | trans->msize = msize; |
1474 | trans->extended = extended; | |
1475 | p = (struct p9_trans_fd *) trans->priv; | |
1476 | p->conn = p9_conn_create(trans); | |
1477 | if (IS_ERR(p->conn)) { | |
1478 | err = PTR_ERR(p->conn); | |
1479 | p->conn = NULL; | |
1480 | goto error; | |
1481 | } | |
1482 | ||
a80d923e EVH |
1483 | return trans; |
1484 | ||
1485 | error: | |
1486 | kfree(trans); | |
1487 | return ERR_PTR(err); | |
1488 | } | |
1489 | ||
1490 | static struct p9_trans_module p9_tcp_trans = { | |
1491 | .name = "tcp", | |
1492 | .maxsize = MAX_SOCK_BUF, | |
1493 | .def = 1, | |
1494 | .create = p9_trans_create_tcp, | |
1495 | }; | |
1496 | ||
1497 | static struct p9_trans_module p9_unix_trans = { | |
1498 | .name = "unix", | |
1499 | .maxsize = MAX_SOCK_BUF, | |
1500 | .def = 0, | |
1501 | .create = p9_trans_create_unix, | |
1502 | }; | |
1503 | ||
1504 | static struct p9_trans_module p9_fd_trans = { | |
1505 | .name = "fd", | |
1506 | .maxsize = MAX_SOCK_BUF, | |
1507 | .def = 0, | |
1508 | .create = p9_trans_create_fd, | |
1509 | }; | |
1510 | ||
1511 | static int __init p9_trans_fd_init(void) | |
1512 | { | |
8a0dc95f EVH |
1513 | int ret = p9_mux_global_init(); |
1514 | if (ret) { | |
1515 | printk(KERN_WARNING "9p: starting mux failed\n"); | |
1516 | return ret; | |
1517 | } | |
1518 | ||
a80d923e EVH |
1519 | v9fs_register_trans(&p9_tcp_trans); |
1520 | v9fs_register_trans(&p9_unix_trans); | |
1521 | v9fs_register_trans(&p9_fd_trans); | |
1522 | ||
1523 | return 1; | |
1524 | } | |
1525 | ||
a80d923e | 1526 | module_init(p9_trans_fd_init); |
a80d923e EVH |
1527 | |
1528 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); | |
1529 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); | |
1530 | MODULE_LICENSE("GPL"); |