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 | 49 | |
ee443996 EVH |
50 | /** |
51 | * struct p9_fd_opts - per-transport options | |
52 | * @rfd: file descriptor for reading (trans=fd) | |
53 | * @wfd: file descriptor for writing (trans=fd) | |
54 | * @port: port to connect to (trans=tcp) | |
55 | * | |
56 | */ | |
57 | ||
a80d923e EVH |
58 | struct p9_fd_opts { |
59 | int rfd; | |
60 | int wfd; | |
61 | u16 port; | |
62 | }; | |
bd238fb4 | 63 | |
ee443996 EVH |
64 | |
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 | |
a80d923e EVH |
89 | static match_table_t tokens = { |
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 | ||
103 | enum { | |
104 | None, | |
105 | Flushing, | |
106 | Flushed, | |
107 | }; | |
108 | ||
109 | struct p9_req; | |
8a0dc95f | 110 | typedef void (*p9_conn_req_callback)(struct p9_req *req, void *a); |
ee443996 EVH |
111 | |
112 | /** | |
113 | * struct p9_req - fd mux encoding of an rpc transaction | |
114 | * @lock: protects req_list | |
115 | * @tag: numeric tag for rpc transaction | |
116 | * @tcall: request &p9_fcall structure | |
117 | * @rcall: response &p9_fcall structure | |
118 | * @err: error state | |
119 | * @cb: callback for when response is received | |
120 | * @cba: argument to pass to callback | |
121 | * @flush: flag to indicate RPC has been flushed | |
122 | * @req_list: list link for higher level objects to chain requests | |
123 | * | |
124 | */ | |
125 | ||
8a0dc95f | 126 | struct p9_req { |
ee443996 | 127 | spinlock_t lock; |
8a0dc95f EVH |
128 | int tag; |
129 | struct p9_fcall *tcall; | |
130 | struct p9_fcall *rcall; | |
131 | int err; | |
132 | p9_conn_req_callback cb; | |
133 | void *cba; | |
134 | int flush; | |
135 | struct list_head req_list; | |
136 | }; | |
137 | ||
ee443996 EVH |
138 | struct p9_mux_poll_task { |
139 | struct task_struct *task; | |
140 | struct list_head mux_list; | |
141 | int muxnum; | |
142 | }; | |
143 | ||
144 | /** | |
145 | * struct p9_conn - fd mux connection state information | |
146 | * @lock: protects mux_list (?) | |
147 | * @mux_list: list link for mux to manage multiple connections (?) | |
148 | * @poll_task: task polling on this connection | |
149 | * @msize: maximum size for connection (dup) | |
150 | * @extended: 9p2000.u flag (dup) | |
151 | * @trans: reference to transport instance for this connection | |
152 | * @tagpool: id accounting for transactions | |
153 | * @err: error state | |
154 | * @equeue: event wait_q (?) | |
155 | * @req_list: accounting for requests which have been sent | |
156 | * @unsent_req_list: accounting for requests that haven't been sent | |
157 | * @rcall: current response &p9_fcall structure | |
158 | * @rpos: read position in current frame | |
159 | * @rbuf: current read buffer | |
160 | * @wpos: write position for current frame | |
161 | * @wsize: amount of data to write for current frame | |
162 | * @wbuf: current write buffer | |
163 | * @poll_wait: array of wait_q's for various worker threads | |
164 | * @poll_waddr: ???? | |
165 | * @pt: poll state | |
166 | * @rq: current read work | |
167 | * @wq: current write work | |
168 | * @wsched: ???? | |
169 | * | |
170 | */ | |
8a0dc95f EVH |
171 | |
172 | struct p9_conn { | |
173 | spinlock_t lock; /* protect lock structure */ | |
174 | struct list_head mux_list; | |
175 | struct p9_mux_poll_task *poll_task; | |
176 | int msize; | |
177 | unsigned char extended; | |
178 | struct p9_trans *trans; | |
179 | struct p9_idpool *tagpool; | |
180 | int err; | |
181 | wait_queue_head_t equeue; | |
182 | struct list_head req_list; | |
183 | struct list_head unsent_req_list; | |
184 | struct p9_fcall *rcall; | |
185 | int rpos; | |
186 | char *rbuf; | |
187 | int wpos; | |
188 | int wsize; | |
189 | char *wbuf; | |
190 | wait_queue_t poll_wait[MAXPOLLWADDR]; | |
191 | wait_queue_head_t *poll_waddr[MAXPOLLWADDR]; | |
192 | poll_table pt; | |
193 | struct work_struct rq; | |
194 | struct work_struct wq; | |
195 | unsigned long wsched; | |
196 | }; | |
197 | ||
ee443996 EVH |
198 | /** |
199 | * struct p9_mux_rpc - fd mux rpc accounting structure | |
200 | * @m: connection this request was issued on | |
201 | * @err: error state | |
202 | * @tcall: request &p9_fcall | |
203 | * @rcall: response &p9_fcall | |
204 | * @wqueue: wait queue that client is blocked on for this rpc | |
205 | * | |
206 | * Bug: isn't this information duplicated elsewhere like &p9_req | |
207 | */ | |
8a0dc95f EVH |
208 | |
209 | struct p9_mux_rpc { | |
210 | struct p9_conn *m; | |
211 | int err; | |
212 | struct p9_fcall *tcall; | |
213 | struct p9_fcall *rcall; | |
214 | wait_queue_head_t wqueue; | |
215 | }; | |
216 | ||
217 | static int p9_poll_proc(void *); | |
218 | static void p9_read_work(struct work_struct *work); | |
219 | static void p9_write_work(struct work_struct *work); | |
220 | static void p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, | |
221 | poll_table *p); | |
222 | static int p9_fd_write(struct p9_trans *trans, void *v, int len); | |
223 | static int p9_fd_read(struct p9_trans *trans, void *v, int len); | |
224 | ||
225 | static DEFINE_MUTEX(p9_mux_task_lock); | |
226 | static struct workqueue_struct *p9_mux_wq; | |
227 | ||
228 | static int p9_mux_num; | |
229 | static int p9_mux_poll_task_num; | |
230 | static struct p9_mux_poll_task p9_mux_poll_tasks[100]; | |
231 | ||
232 | static void p9_conn_destroy(struct p9_conn *); | |
233 | static unsigned int p9_fd_poll(struct p9_trans *trans, | |
234 | struct poll_table_struct *pt); | |
235 | ||
236 | #ifdef P9_NONBLOCK | |
237 | static int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc, | |
238 | p9_conn_req_callback cb, void *a); | |
239 | #endif /* P9_NONBLOCK */ | |
240 | ||
241 | static void p9_conn_cancel(struct p9_conn *m, int err); | |
242 | ||
243 | static int p9_mux_global_init(void) | |
244 | { | |
245 | int i; | |
246 | ||
247 | for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) | |
248 | p9_mux_poll_tasks[i].task = NULL; | |
249 | ||
250 | p9_mux_wq = create_workqueue("v9fs"); | |
251 | if (!p9_mux_wq) { | |
252 | printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n"); | |
253 | return -ENOMEM; | |
254 | } | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | static u16 p9_mux_get_tag(struct p9_conn *m) | |
260 | { | |
261 | int tag; | |
262 | ||
263 | tag = p9_idpool_get(m->tagpool); | |
264 | if (tag < 0) | |
265 | return P9_NOTAG; | |
266 | else | |
267 | return (u16) tag; | |
268 | } | |
269 | ||
270 | static void p9_mux_put_tag(struct p9_conn *m, u16 tag) | |
271 | { | |
272 | if (tag != P9_NOTAG && p9_idpool_check(tag, m->tagpool)) | |
273 | p9_idpool_put(tag, m->tagpool); | |
274 | } | |
275 | ||
276 | /** | |
277 | * p9_mux_calc_poll_procs - calculates the number of polling procs | |
ee443996 | 278 | * @muxnum: number of mounts |
8a0dc95f | 279 | * |
ee443996 | 280 | * Calculation is based on the number of mounted v9fs filesystems. |
8a0dc95f EVH |
281 | * The current implementation returns sqrt of the number of mounts. |
282 | */ | |
ee443996 | 283 | |
8a0dc95f EVH |
284 | static int p9_mux_calc_poll_procs(int muxnum) |
285 | { | |
286 | int n; | |
287 | ||
288 | if (p9_mux_poll_task_num) | |
289 | n = muxnum / p9_mux_poll_task_num + | |
290 | (muxnum % p9_mux_poll_task_num ? 1 : 0); | |
291 | else | |
292 | n = 1; | |
293 | ||
294 | if (n > ARRAY_SIZE(p9_mux_poll_tasks)) | |
295 | n = ARRAY_SIZE(p9_mux_poll_tasks); | |
296 | ||
297 | return n; | |
298 | } | |
299 | ||
300 | static int p9_mux_poll_start(struct p9_conn *m) | |
301 | { | |
302 | int i, n; | |
303 | struct p9_mux_poll_task *vpt, *vptlast; | |
304 | struct task_struct *pproc; | |
305 | ||
306 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p muxnum %d procnum %d\n", m, p9_mux_num, | |
307 | p9_mux_poll_task_num); | |
308 | mutex_lock(&p9_mux_task_lock); | |
309 | ||
310 | n = p9_mux_calc_poll_procs(p9_mux_num + 1); | |
311 | if (n > p9_mux_poll_task_num) { | |
312 | for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) { | |
313 | if (p9_mux_poll_tasks[i].task == NULL) { | |
314 | vpt = &p9_mux_poll_tasks[i]; | |
315 | P9_DPRINTK(P9_DEBUG_MUX, "create proc %p\n", | |
316 | vpt); | |
317 | pproc = kthread_create(p9_poll_proc, vpt, | |
318 | "v9fs-poll"); | |
319 | ||
320 | if (!IS_ERR(pproc)) { | |
321 | vpt->task = pproc; | |
322 | INIT_LIST_HEAD(&vpt->mux_list); | |
323 | vpt->muxnum = 0; | |
324 | p9_mux_poll_task_num++; | |
325 | wake_up_process(vpt->task); | |
326 | } | |
327 | break; | |
328 | } | |
329 | } | |
330 | ||
331 | if (i >= ARRAY_SIZE(p9_mux_poll_tasks)) | |
332 | P9_DPRINTK(P9_DEBUG_ERROR, | |
333 | "warning: no free poll slots\n"); | |
334 | } | |
335 | ||
336 | n = (p9_mux_num + 1) / p9_mux_poll_task_num + | |
337 | ((p9_mux_num + 1) % p9_mux_poll_task_num ? 1 : 0); | |
338 | ||
339 | vptlast = NULL; | |
340 | for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) { | |
341 | vpt = &p9_mux_poll_tasks[i]; | |
342 | if (vpt->task != NULL) { | |
343 | vptlast = vpt; | |
344 | if (vpt->muxnum < n) { | |
345 | P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i); | |
346 | list_add(&m->mux_list, &vpt->mux_list); | |
347 | vpt->muxnum++; | |
348 | m->poll_task = vpt; | |
349 | memset(&m->poll_waddr, 0, | |
350 | sizeof(m->poll_waddr)); | |
351 | init_poll_funcptr(&m->pt, p9_pollwait); | |
352 | break; | |
353 | } | |
354 | } | |
355 | } | |
356 | ||
357 | if (i >= ARRAY_SIZE(p9_mux_poll_tasks)) { | |
358 | if (vptlast == NULL) { | |
359 | mutex_unlock(&p9_mux_task_lock); | |
360 | return -ENOMEM; | |
361 | } | |
362 | ||
363 | P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i); | |
364 | list_add(&m->mux_list, &vptlast->mux_list); | |
365 | vptlast->muxnum++; | |
366 | m->poll_task = vptlast; | |
367 | memset(&m->poll_waddr, 0, sizeof(m->poll_waddr)); | |
368 | init_poll_funcptr(&m->pt, p9_pollwait); | |
369 | } | |
370 | ||
371 | p9_mux_num++; | |
372 | mutex_unlock(&p9_mux_task_lock); | |
373 | ||
374 | return 0; | |
375 | } | |
376 | ||
377 | static void p9_mux_poll_stop(struct p9_conn *m) | |
378 | { | |
379 | int i; | |
380 | struct p9_mux_poll_task *vpt; | |
381 | ||
382 | mutex_lock(&p9_mux_task_lock); | |
383 | vpt = m->poll_task; | |
384 | list_del(&m->mux_list); | |
385 | for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) { | |
386 | if (m->poll_waddr[i] != NULL) { | |
387 | remove_wait_queue(m->poll_waddr[i], &m->poll_wait[i]); | |
388 | m->poll_waddr[i] = NULL; | |
389 | } | |
390 | } | |
391 | vpt->muxnum--; | |
392 | if (!vpt->muxnum) { | |
393 | P9_DPRINTK(P9_DEBUG_MUX, "destroy proc %p\n", vpt); | |
394 | kthread_stop(vpt->task); | |
395 | vpt->task = NULL; | |
396 | p9_mux_poll_task_num--; | |
397 | } | |
398 | p9_mux_num--; | |
399 | mutex_unlock(&p9_mux_task_lock); | |
400 | } | |
401 | ||
402 | /** | |
403 | * p9_conn_create - allocate and initialize the per-session mux data | |
ee443996 | 404 | * @trans: transport structure |
8a0dc95f | 405 | * |
ee443996 | 406 | * Note: Creates the polling task if this is the first session. |
8a0dc95f | 407 | */ |
ee443996 | 408 | |
8a0dc95f EVH |
409 | static struct p9_conn *p9_conn_create(struct p9_trans *trans) |
410 | { | |
411 | int i, n; | |
412 | struct p9_conn *m, *mtmp; | |
413 | ||
414 | P9_DPRINTK(P9_DEBUG_MUX, "transport %p msize %d\n", trans, | |
415 | trans->msize); | |
416 | m = kmalloc(sizeof(struct p9_conn), GFP_KERNEL); | |
417 | if (!m) | |
418 | return ERR_PTR(-ENOMEM); | |
419 | ||
420 | spin_lock_init(&m->lock); | |
421 | INIT_LIST_HEAD(&m->mux_list); | |
422 | m->msize = trans->msize; | |
423 | m->extended = trans->extended; | |
424 | m->trans = trans; | |
425 | m->tagpool = p9_idpool_create(); | |
426 | if (IS_ERR(m->tagpool)) { | |
427 | mtmp = ERR_PTR(-ENOMEM); | |
428 | kfree(m); | |
429 | return mtmp; | |
430 | } | |
431 | ||
432 | m->err = 0; | |
433 | init_waitqueue_head(&m->equeue); | |
434 | INIT_LIST_HEAD(&m->req_list); | |
435 | INIT_LIST_HEAD(&m->unsent_req_list); | |
436 | m->rcall = NULL; | |
437 | m->rpos = 0; | |
438 | m->rbuf = NULL; | |
439 | m->wpos = m->wsize = 0; | |
440 | m->wbuf = NULL; | |
441 | INIT_WORK(&m->rq, p9_read_work); | |
442 | INIT_WORK(&m->wq, p9_write_work); | |
443 | m->wsched = 0; | |
444 | memset(&m->poll_waddr, 0, sizeof(m->poll_waddr)); | |
445 | m->poll_task = NULL; | |
446 | n = p9_mux_poll_start(m); | |
447 | if (n) { | |
448 | kfree(m); | |
449 | return ERR_PTR(n); | |
450 | } | |
451 | ||
452 | n = p9_fd_poll(trans, &m->pt); | |
453 | if (n & POLLIN) { | |
454 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); | |
455 | set_bit(Rpending, &m->wsched); | |
456 | } | |
457 | ||
458 | if (n & POLLOUT) { | |
459 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); | |
460 | set_bit(Wpending, &m->wsched); | |
461 | } | |
462 | ||
463 | for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) { | |
464 | if (IS_ERR(m->poll_waddr[i])) { | |
465 | p9_mux_poll_stop(m); | |
466 | mtmp = (void *)m->poll_waddr; /* the error code */ | |
467 | kfree(m); | |
468 | m = mtmp; | |
469 | break; | |
470 | } | |
471 | } | |
472 | ||
473 | return m; | |
474 | } | |
475 | ||
476 | /** | |
477 | * p9_mux_destroy - cancels all pending requests and frees mux resources | |
ee443996 EVH |
478 | * @m: mux to destroy |
479 | * | |
8a0dc95f | 480 | */ |
ee443996 | 481 | |
8a0dc95f EVH |
482 | static void p9_conn_destroy(struct p9_conn *m) |
483 | { | |
484 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m, | |
485 | m->mux_list.prev, m->mux_list.next); | |
486 | p9_conn_cancel(m, -ECONNRESET); | |
487 | ||
488 | if (!list_empty(&m->req_list)) { | |
489 | /* wait until all processes waiting on this session exit */ | |
490 | P9_DPRINTK(P9_DEBUG_MUX, | |
491 | "mux %p waiting for empty request queue\n", m); | |
492 | wait_event_timeout(m->equeue, (list_empty(&m->req_list)), 5000); | |
493 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p request queue empty: %d\n", m, | |
494 | list_empty(&m->req_list)); | |
495 | } | |
496 | ||
497 | p9_mux_poll_stop(m); | |
498 | m->trans = NULL; | |
499 | p9_idpool_destroy(m->tagpool); | |
500 | kfree(m); | |
501 | } | |
502 | ||
503 | /** | |
ee443996 EVH |
504 | * p9_pollwait - add poll task to the wait queue |
505 | * @filp: file pointer being polled | |
506 | * @wait_address: wait_q to block on | |
507 | * @p: poll state | |
508 | * | |
509 | * called by files poll operation to add v9fs-poll task to files wait queue | |
8a0dc95f | 510 | */ |
ee443996 | 511 | |
8a0dc95f EVH |
512 | static void |
513 | p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) | |
514 | { | |
515 | int i; | |
516 | struct p9_conn *m; | |
517 | ||
518 | m = container_of(p, struct p9_conn, pt); | |
519 | for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) | |
520 | if (m->poll_waddr[i] == NULL) | |
521 | break; | |
522 | ||
523 | if (i >= ARRAY_SIZE(m->poll_waddr)) { | |
524 | P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n"); | |
525 | return; | |
526 | } | |
527 | ||
528 | m->poll_waddr[i] = wait_address; | |
529 | ||
530 | if (!wait_address) { | |
531 | P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n"); | |
532 | m->poll_waddr[i] = ERR_PTR(-EIO); | |
533 | return; | |
534 | } | |
535 | ||
536 | init_waitqueue_entry(&m->poll_wait[i], m->poll_task->task); | |
537 | add_wait_queue(wait_address, &m->poll_wait[i]); | |
538 | } | |
539 | ||
540 | /** | |
541 | * p9_poll_mux - polls a mux and schedules read or write works if necessary | |
ee443996 EVH |
542 | * @m: connection to poll |
543 | * | |
8a0dc95f | 544 | */ |
ee443996 | 545 | |
8a0dc95f EVH |
546 | static void p9_poll_mux(struct p9_conn *m) |
547 | { | |
548 | int n; | |
549 | ||
550 | if (m->err < 0) | |
551 | return; | |
552 | ||
553 | n = p9_fd_poll(m->trans, NULL); | |
554 | if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { | |
555 | P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n); | |
556 | if (n >= 0) | |
557 | n = -ECONNRESET; | |
558 | p9_conn_cancel(m, n); | |
559 | } | |
560 | ||
561 | if (n & POLLIN) { | |
562 | set_bit(Rpending, &m->wsched); | |
563 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); | |
564 | if (!test_and_set_bit(Rworksched, &m->wsched)) { | |
565 | P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); | |
566 | queue_work(p9_mux_wq, &m->rq); | |
567 | } | |
568 | } | |
569 | ||
570 | if (n & POLLOUT) { | |
571 | set_bit(Wpending, &m->wsched); | |
572 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); | |
573 | if ((m->wsize || !list_empty(&m->unsent_req_list)) | |
574 | && !test_and_set_bit(Wworksched, &m->wsched)) { | |
575 | P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); | |
576 | queue_work(p9_mux_wq, &m->wq); | |
577 | } | |
578 | } | |
579 | } | |
580 | ||
581 | /** | |
ee443996 EVH |
582 | * p9_poll_proc - poll worker thread |
583 | * @a: thread state and arguments | |
584 | * | |
585 | * polls all v9fs transports for new events and queues the appropriate | |
586 | * work to the work queue | |
587 | * | |
8a0dc95f | 588 | */ |
ee443996 | 589 | |
8a0dc95f EVH |
590 | static int p9_poll_proc(void *a) |
591 | { | |
592 | struct p9_conn *m, *mtmp; | |
593 | struct p9_mux_poll_task *vpt; | |
594 | ||
595 | vpt = a; | |
596 | P9_DPRINTK(P9_DEBUG_MUX, "start %p %p\n", current, vpt); | |
597 | while (!kthread_should_stop()) { | |
598 | set_current_state(TASK_INTERRUPTIBLE); | |
599 | ||
600 | list_for_each_entry_safe(m, mtmp, &vpt->mux_list, mux_list) { | |
601 | p9_poll_mux(m); | |
602 | } | |
603 | ||
604 | P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n"); | |
605 | schedule_timeout(SCHED_TIMEOUT * HZ); | |
606 | } | |
607 | ||
608 | __set_current_state(TASK_RUNNING); | |
609 | P9_DPRINTK(P9_DEBUG_MUX, "finish\n"); | |
610 | return 0; | |
611 | } | |
612 | ||
613 | /** | |
614 | * p9_write_work - called when a transport can send some data | |
ee443996 EVH |
615 | * @work: container for work to be done |
616 | * | |
8a0dc95f | 617 | */ |
ee443996 | 618 | |
8a0dc95f EVH |
619 | static void p9_write_work(struct work_struct *work) |
620 | { | |
621 | int n, err; | |
622 | struct p9_conn *m; | |
623 | struct p9_req *req; | |
624 | ||
625 | m = container_of(work, struct p9_conn, wq); | |
626 | ||
627 | if (m->err < 0) { | |
628 | clear_bit(Wworksched, &m->wsched); | |
629 | return; | |
630 | } | |
631 | ||
632 | if (!m->wsize) { | |
633 | if (list_empty(&m->unsent_req_list)) { | |
634 | clear_bit(Wworksched, &m->wsched); | |
635 | return; | |
636 | } | |
637 | ||
638 | spin_lock(&m->lock); | |
639 | again: | |
640 | req = list_entry(m->unsent_req_list.next, struct p9_req, | |
641 | req_list); | |
642 | list_move_tail(&req->req_list, &m->req_list); | |
643 | if (req->err == ERREQFLUSH) | |
644 | goto again; | |
645 | ||
646 | m->wbuf = req->tcall->sdata; | |
647 | m->wsize = req->tcall->size; | |
648 | m->wpos = 0; | |
649 | spin_unlock(&m->lock); | |
650 | } | |
651 | ||
652 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos, | |
653 | m->wsize); | |
654 | clear_bit(Wpending, &m->wsched); | |
655 | err = p9_fd_write(m->trans, m->wbuf + m->wpos, m->wsize - m->wpos); | |
656 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err); | |
657 | if (err == -EAGAIN) { | |
658 | clear_bit(Wworksched, &m->wsched); | |
659 | return; | |
660 | } | |
661 | ||
662 | if (err < 0) | |
663 | goto error; | |
664 | else if (err == 0) { | |
665 | err = -EREMOTEIO; | |
666 | goto error; | |
667 | } | |
668 | ||
669 | m->wpos += err; | |
670 | if (m->wpos == m->wsize) | |
671 | m->wpos = m->wsize = 0; | |
672 | ||
673 | if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) { | |
674 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
675 | n = POLLOUT; | |
676 | else | |
677 | n = p9_fd_poll(m->trans, NULL); | |
678 | ||
679 | if (n & POLLOUT) { | |
680 | P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); | |
681 | queue_work(p9_mux_wq, &m->wq); | |
682 | } else | |
683 | clear_bit(Wworksched, &m->wsched); | |
684 | } else | |
685 | clear_bit(Wworksched, &m->wsched); | |
686 | ||
687 | return; | |
688 | ||
689 | error: | |
690 | p9_conn_cancel(m, err); | |
691 | clear_bit(Wworksched, &m->wsched); | |
692 | } | |
693 | ||
694 | static void process_request(struct p9_conn *m, struct p9_req *req) | |
695 | { | |
696 | int ecode; | |
697 | struct p9_str *ename; | |
698 | ||
699 | if (!req->err && req->rcall->id == P9_RERROR) { | |
700 | ecode = req->rcall->params.rerror.errno; | |
701 | ename = &req->rcall->params.rerror.error; | |
702 | ||
703 | P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len, | |
704 | ename->str); | |
705 | ||
706 | if (m->extended) | |
707 | req->err = -ecode; | |
708 | ||
709 | if (!req->err) { | |
710 | req->err = p9_errstr2errno(ename->str, ename->len); | |
711 | ||
712 | /* string match failed */ | |
713 | if (!req->err) { | |
714 | PRINT_FCALL_ERROR("unknown error", req->rcall); | |
715 | req->err = -ESERVERFAULT; | |
716 | } | |
717 | } | |
718 | } else if (req->tcall && req->rcall->id != req->tcall->id + 1) { | |
719 | P9_DPRINTK(P9_DEBUG_ERROR, | |
720 | "fcall mismatch: expected %d, got %d\n", | |
721 | req->tcall->id + 1, req->rcall->id); | |
722 | if (!req->err) | |
723 | req->err = -EIO; | |
724 | } | |
725 | } | |
726 | ||
727 | /** | |
728 | * p9_read_work - called when there is some data to be read from a transport | |
ee443996 EVH |
729 | * @work: container of work to be done |
730 | * | |
8a0dc95f | 731 | */ |
ee443996 | 732 | |
8a0dc95f EVH |
733 | static void p9_read_work(struct work_struct *work) |
734 | { | |
735 | int n, err; | |
736 | struct p9_conn *m; | |
737 | struct p9_req *req, *rptr, *rreq; | |
738 | struct p9_fcall *rcall; | |
739 | char *rbuf; | |
740 | ||
741 | m = container_of(work, struct p9_conn, rq); | |
742 | ||
743 | if (m->err < 0) | |
744 | return; | |
745 | ||
746 | rcall = NULL; | |
747 | P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos); | |
748 | ||
749 | if (!m->rcall) { | |
750 | m->rcall = | |
751 | kmalloc(sizeof(struct p9_fcall) + m->msize, GFP_KERNEL); | |
752 | if (!m->rcall) { | |
753 | err = -ENOMEM; | |
754 | goto error; | |
755 | } | |
756 | ||
757 | m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall); | |
758 | m->rpos = 0; | |
759 | } | |
760 | ||
761 | clear_bit(Rpending, &m->wsched); | |
762 | err = p9_fd_read(m->trans, m->rbuf + m->rpos, m->msize - m->rpos); | |
763 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err); | |
764 | if (err == -EAGAIN) { | |
765 | clear_bit(Rworksched, &m->wsched); | |
766 | return; | |
767 | } | |
768 | ||
769 | if (err <= 0) | |
770 | goto error; | |
771 | ||
772 | m->rpos += err; | |
773 | while (m->rpos > 4) { | |
774 | n = le32_to_cpu(*(__le32 *) m->rbuf); | |
775 | if (n >= m->msize) { | |
776 | P9_DPRINTK(P9_DEBUG_ERROR, | |
777 | "requested packet size too big: %d\n", n); | |
778 | err = -EIO; | |
779 | goto error; | |
780 | } | |
781 | ||
782 | if (m->rpos < n) | |
783 | break; | |
784 | ||
785 | err = | |
786 | p9_deserialize_fcall(m->rbuf, n, m->rcall, m->extended); | |
787 | if (err < 0) | |
788 | goto error; | |
789 | ||
790 | #ifdef CONFIG_NET_9P_DEBUG | |
791 | if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { | |
792 | char buf[150]; | |
793 | ||
794 | p9_printfcall(buf, sizeof(buf), m->rcall, | |
795 | m->extended); | |
796 | printk(KERN_NOTICE ">>> %p %s\n", m, buf); | |
797 | } | |
798 | #endif | |
799 | ||
800 | rcall = m->rcall; | |
801 | rbuf = m->rbuf; | |
802 | if (m->rpos > n) { | |
803 | m->rcall = kmalloc(sizeof(struct p9_fcall) + m->msize, | |
804 | GFP_KERNEL); | |
805 | if (!m->rcall) { | |
806 | err = -ENOMEM; | |
807 | goto error; | |
808 | } | |
809 | ||
810 | m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall); | |
811 | memmove(m->rbuf, rbuf + n, m->rpos - n); | |
812 | m->rpos -= n; | |
813 | } else { | |
814 | m->rcall = NULL; | |
815 | m->rbuf = NULL; | |
816 | m->rpos = 0; | |
817 | } | |
818 | ||
819 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m, | |
820 | rcall->id, rcall->tag); | |
821 | ||
822 | req = NULL; | |
823 | spin_lock(&m->lock); | |
824 | list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) { | |
825 | if (rreq->tag == rcall->tag) { | |
826 | req = rreq; | |
827 | if (req->flush != Flushing) | |
828 | list_del(&req->req_list); | |
829 | break; | |
830 | } | |
831 | } | |
832 | spin_unlock(&m->lock); | |
833 | ||
834 | if (req) { | |
835 | req->rcall = rcall; | |
836 | process_request(m, req); | |
837 | ||
838 | if (req->flush != Flushing) { | |
839 | if (req->cb) | |
840 | (*req->cb) (req, req->cba); | |
841 | else | |
842 | kfree(req->rcall); | |
843 | ||
844 | wake_up(&m->equeue); | |
845 | } | |
846 | } else { | |
847 | if (err >= 0 && rcall->id != P9_RFLUSH) | |
848 | P9_DPRINTK(P9_DEBUG_ERROR, | |
849 | "unexpected response mux %p id %d tag %d\n", | |
850 | m, rcall->id, rcall->tag); | |
851 | kfree(rcall); | |
852 | } | |
853 | } | |
854 | ||
855 | if (!list_empty(&m->req_list)) { | |
856 | if (test_and_clear_bit(Rpending, &m->wsched)) | |
857 | n = POLLIN; | |
858 | else | |
859 | n = p9_fd_poll(m->trans, NULL); | |
860 | ||
861 | if (n & POLLIN) { | |
862 | P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); | |
863 | queue_work(p9_mux_wq, &m->rq); | |
864 | } else | |
865 | clear_bit(Rworksched, &m->wsched); | |
866 | } else | |
867 | clear_bit(Rworksched, &m->wsched); | |
868 | ||
869 | return; | |
870 | ||
871 | error: | |
872 | p9_conn_cancel(m, err); | |
873 | clear_bit(Rworksched, &m->wsched); | |
874 | } | |
875 | ||
876 | /** | |
877 | * p9_send_request - send 9P request | |
878 | * The function can sleep until the request is scheduled for sending. | |
879 | * The function can be interrupted. Return from the function is not | |
880 | * a guarantee that the request is sent successfully. Can return errors | |
881 | * that can be retrieved by PTR_ERR macros. | |
882 | * | |
883 | * @m: mux data | |
884 | * @tc: request to be sent | |
885 | * @cb: callback function to call when response is received | |
886 | * @cba: parameter to pass to the callback function | |
ee443996 | 887 | * |
8a0dc95f | 888 | */ |
ee443996 | 889 | |
8a0dc95f EVH |
890 | static struct p9_req *p9_send_request(struct p9_conn *m, |
891 | struct p9_fcall *tc, | |
892 | p9_conn_req_callback cb, void *cba) | |
893 | { | |
894 | int n; | |
895 | struct p9_req *req; | |
896 | ||
897 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current, | |
898 | tc, tc->id); | |
899 | if (m->err < 0) | |
900 | return ERR_PTR(m->err); | |
901 | ||
902 | req = kmalloc(sizeof(struct p9_req), GFP_KERNEL); | |
903 | if (!req) | |
904 | return ERR_PTR(-ENOMEM); | |
905 | ||
906 | if (tc->id == P9_TVERSION) | |
907 | n = P9_NOTAG; | |
908 | else | |
909 | n = p9_mux_get_tag(m); | |
910 | ||
911 | if (n < 0) | |
912 | return ERR_PTR(-ENOMEM); | |
913 | ||
914 | p9_set_tag(tc, n); | |
915 | ||
916 | #ifdef CONFIG_NET_9P_DEBUG | |
917 | if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { | |
918 | char buf[150]; | |
919 | ||
920 | p9_printfcall(buf, sizeof(buf), tc, m->extended); | |
921 | printk(KERN_NOTICE "<<< %p %s\n", m, buf); | |
922 | } | |
923 | #endif | |
924 | ||
925 | spin_lock_init(&req->lock); | |
926 | req->tag = n; | |
927 | req->tcall = tc; | |
928 | req->rcall = NULL; | |
929 | req->err = 0; | |
930 | req->cb = cb; | |
931 | req->cba = cba; | |
932 | req->flush = None; | |
933 | ||
934 | spin_lock(&m->lock); | |
935 | list_add_tail(&req->req_list, &m->unsent_req_list); | |
936 | spin_unlock(&m->lock); | |
937 | ||
938 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
939 | n = POLLOUT; | |
940 | else | |
941 | n = p9_fd_poll(m->trans, NULL); | |
942 | ||
943 | if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) | |
944 | queue_work(p9_mux_wq, &m->wq); | |
945 | ||
946 | return req; | |
947 | } | |
948 | ||
949 | static void p9_mux_free_request(struct p9_conn *m, struct p9_req *req) | |
950 | { | |
951 | p9_mux_put_tag(m, req->tag); | |
952 | kfree(req); | |
953 | } | |
954 | ||
955 | static void p9_mux_flush_cb(struct p9_req *freq, void *a) | |
956 | { | |
8a0dc95f EVH |
957 | int tag; |
958 | struct p9_conn *m; | |
959 | struct p9_req *req, *rreq, *rptr; | |
960 | ||
961 | m = a; | |
962 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m, | |
963 | freq->tcall, freq->rcall, freq->err, | |
964 | freq->tcall->params.tflush.oldtag); | |
965 | ||
966 | spin_lock(&m->lock); | |
8a0dc95f EVH |
967 | tag = freq->tcall->params.tflush.oldtag; |
968 | req = NULL; | |
969 | list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) { | |
970 | if (rreq->tag == tag) { | |
971 | req = rreq; | |
972 | list_del(&req->req_list); | |
973 | break; | |
974 | } | |
975 | } | |
976 | spin_unlock(&m->lock); | |
977 | ||
978 | if (req) { | |
979 | spin_lock(&req->lock); | |
980 | req->flush = Flushed; | |
981 | spin_unlock(&req->lock); | |
982 | ||
983 | if (req->cb) | |
984 | (*req->cb) (req, req->cba); | |
985 | else | |
986 | kfree(req->rcall); | |
987 | ||
988 | wake_up(&m->equeue); | |
989 | } | |
990 | ||
991 | kfree(freq->tcall); | |
992 | kfree(freq->rcall); | |
993 | p9_mux_free_request(m, freq); | |
994 | } | |
995 | ||
996 | static int | |
997 | p9_mux_flush_request(struct p9_conn *m, struct p9_req *req) | |
998 | { | |
999 | struct p9_fcall *fc; | |
1000 | struct p9_req *rreq, *rptr; | |
1001 | ||
1002 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag); | |
1003 | ||
1004 | /* if a response was received for a request, do nothing */ | |
1005 | spin_lock(&req->lock); | |
1006 | if (req->rcall || req->err) { | |
1007 | spin_unlock(&req->lock); | |
1008 | P9_DPRINTK(P9_DEBUG_MUX, | |
1009 | "mux %p req %p response already received\n", m, req); | |
1010 | return 0; | |
1011 | } | |
1012 | ||
1013 | req->flush = Flushing; | |
1014 | spin_unlock(&req->lock); | |
1015 | ||
1016 | spin_lock(&m->lock); | |
1017 | /* if the request is not sent yet, just remove it from the list */ | |
1018 | list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) { | |
1019 | if (rreq->tag == req->tag) { | |
1020 | P9_DPRINTK(P9_DEBUG_MUX, | |
1021 | "mux %p req %p request is not sent yet\n", m, req); | |
1022 | list_del(&rreq->req_list); | |
1023 | req->flush = Flushed; | |
1024 | spin_unlock(&m->lock); | |
1025 | if (req->cb) | |
1026 | (*req->cb) (req, req->cba); | |
1027 | return 0; | |
1028 | } | |
1029 | } | |
1030 | spin_unlock(&m->lock); | |
1031 | ||
1032 | clear_thread_flag(TIF_SIGPENDING); | |
1033 | fc = p9_create_tflush(req->tag); | |
1034 | p9_send_request(m, fc, p9_mux_flush_cb, m); | |
1035 | return 1; | |
1036 | } | |
1037 | ||
1038 | static void | |
1039 | p9_conn_rpc_cb(struct p9_req *req, void *a) | |
1040 | { | |
1041 | struct p9_mux_rpc *r; | |
1042 | ||
1043 | P9_DPRINTK(P9_DEBUG_MUX, "req %p r %p\n", req, a); | |
1044 | r = a; | |
1045 | r->rcall = req->rcall; | |
1046 | r->err = req->err; | |
1047 | ||
1048 | if (req->flush != None && !req->err) | |
1049 | r->err = -ERESTARTSYS; | |
1050 | ||
1051 | wake_up(&r->wqueue); | |
1052 | } | |
1053 | ||
1054 | /** | |
1055 | * p9_fd_rpc- sends 9P request and waits until a response is available. | |
1056 | * The function can be interrupted. | |
ee443996 | 1057 | * @t: transport data |
8a0dc95f EVH |
1058 | * @tc: request to be sent |
1059 | * @rc: pointer where a pointer to the response is stored | |
ee443996 | 1060 | * |
8a0dc95f | 1061 | */ |
ee443996 | 1062 | |
8a0dc95f EVH |
1063 | int |
1064 | p9_fd_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc) | |
1065 | { | |
1066 | struct p9_trans_fd *p = t->priv; | |
1067 | struct p9_conn *m = p->conn; | |
1068 | int err, sigpending; | |
1069 | unsigned long flags; | |
1070 | struct p9_req *req; | |
1071 | struct p9_mux_rpc r; | |
1072 | ||
1073 | r.err = 0; | |
1074 | r.tcall = tc; | |
1075 | r.rcall = NULL; | |
1076 | r.m = m; | |
1077 | init_waitqueue_head(&r.wqueue); | |
1078 | ||
1079 | if (rc) | |
1080 | *rc = NULL; | |
1081 | ||
1082 | sigpending = 0; | |
1083 | if (signal_pending(current)) { | |
1084 | sigpending = 1; | |
1085 | clear_thread_flag(TIF_SIGPENDING); | |
1086 | } | |
1087 | ||
1088 | req = p9_send_request(m, tc, p9_conn_rpc_cb, &r); | |
1089 | if (IS_ERR(req)) { | |
1090 | err = PTR_ERR(req); | |
1091 | P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err); | |
1092 | return err; | |
1093 | } | |
1094 | ||
1095 | err = wait_event_interruptible(r.wqueue, r.rcall != NULL || r.err < 0); | |
1096 | if (r.err < 0) | |
1097 | err = r.err; | |
1098 | ||
1099 | if (err == -ERESTARTSYS && m->trans->status == Connected | |
1100 | && m->err == 0) { | |
1101 | if (p9_mux_flush_request(m, req)) { | |
1102 | /* wait until we get response of the flush message */ | |
1103 | do { | |
1104 | clear_thread_flag(TIF_SIGPENDING); | |
1105 | err = wait_event_interruptible(r.wqueue, | |
1106 | r.rcall || r.err); | |
1107 | } while (!r.rcall && !r.err && err == -ERESTARTSYS && | |
1108 | m->trans->status == Connected && !m->err); | |
1109 | ||
1110 | err = -ERESTARTSYS; | |
1111 | } | |
1112 | sigpending = 1; | |
1113 | } | |
1114 | ||
1115 | if (sigpending) { | |
1116 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
1117 | recalc_sigpending(); | |
1118 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
1119 | } | |
1120 | ||
1121 | if (rc) | |
1122 | *rc = r.rcall; | |
1123 | else | |
1124 | kfree(r.rcall); | |
1125 | ||
1126 | p9_mux_free_request(m, req); | |
1127 | if (err > 0) | |
1128 | err = -EIO; | |
1129 | ||
1130 | return err; | |
1131 | } | |
1132 | ||
1133 | #ifdef P9_NONBLOCK | |
1134 | /** | |
1135 | * p9_conn_rpcnb - sends 9P request without waiting for response. | |
1136 | * @m: mux data | |
1137 | * @tc: request to be sent | |
1138 | * @cb: callback function to be called when response arrives | |
ee443996 EVH |
1139 | * @a: value to pass to the callback function |
1140 | * | |
8a0dc95f | 1141 | */ |
ee443996 | 1142 | |
8a0dc95f EVH |
1143 | int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc, |
1144 | p9_conn_req_callback cb, void *a) | |
1145 | { | |
1146 | int err; | |
1147 | struct p9_req *req; | |
1148 | ||
1149 | req = p9_send_request(m, tc, cb, a); | |
1150 | if (IS_ERR(req)) { | |
1151 | err = PTR_ERR(req); | |
1152 | P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err); | |
1153 | return PTR_ERR(req); | |
1154 | } | |
1155 | ||
1156 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag); | |
1157 | return 0; | |
1158 | } | |
1159 | #endif /* P9_NONBLOCK */ | |
1160 | ||
1161 | /** | |
1162 | * p9_conn_cancel - cancel all pending requests with error | |
1163 | * @m: mux data | |
1164 | * @err: error code | |
ee443996 | 1165 | * |
8a0dc95f | 1166 | */ |
ee443996 | 1167 | |
8a0dc95f EVH |
1168 | void p9_conn_cancel(struct p9_conn *m, int err) |
1169 | { | |
1170 | struct p9_req *req, *rtmp; | |
1171 | LIST_HEAD(cancel_list); | |
1172 | ||
1173 | P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); | |
1174 | m->err = err; | |
1175 | spin_lock(&m->lock); | |
1176 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { | |
1177 | list_move(&req->req_list, &cancel_list); | |
1178 | } | |
1179 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { | |
1180 | list_move(&req->req_list, &cancel_list); | |
1181 | } | |
1182 | spin_unlock(&m->lock); | |
1183 | ||
1184 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { | |
1185 | list_del(&req->req_list); | |
1186 | if (!req->err) | |
1187 | req->err = err; | |
1188 | ||
1189 | if (req->cb) | |
1190 | (*req->cb) (req, req->cba); | |
1191 | else | |
1192 | kfree(req->rcall); | |
1193 | } | |
1194 | ||
1195 | wake_up(&m->equeue); | |
1196 | } | |
1197 | ||
a80d923e EVH |
1198 | /** |
1199 | * v9fs_parse_options - parse mount options into session structure | |
1200 | * @options: options string passed from mount | |
ee443996 | 1201 | * @opts: transport-specific structure to parse options into |
a80d923e EVH |
1202 | * |
1203 | */ | |
bd238fb4 | 1204 | |
a80d923e | 1205 | static void parse_opts(char *options, struct p9_fd_opts *opts) |
bd238fb4 | 1206 | { |
a80d923e EVH |
1207 | char *p; |
1208 | substring_t args[MAX_OPT_ARGS]; | |
1209 | int option; | |
1210 | int ret; | |
bd238fb4 | 1211 | |
a80d923e EVH |
1212 | opts->port = P9_PORT; |
1213 | opts->rfd = ~0; | |
1214 | opts->wfd = ~0; | |
bd238fb4 | 1215 | |
a80d923e EVH |
1216 | if (!options) |
1217 | return; | |
bd238fb4 | 1218 | |
a80d923e EVH |
1219 | while ((p = strsep(&options, ",")) != NULL) { |
1220 | int token; | |
1221 | if (!*p) | |
1222 | continue; | |
1223 | token = match_token(p, tokens, args); | |
1224 | ret = match_int(&args[0], &option); | |
1225 | if (ret < 0) { | |
1226 | P9_DPRINTK(P9_DEBUG_ERROR, | |
1227 | "integer field, but no integer?\n"); | |
1228 | continue; | |
1229 | } | |
1230 | switch (token) { | |
1231 | case Opt_port: | |
1232 | opts->port = option; | |
1233 | break; | |
1234 | case Opt_rfdno: | |
1235 | opts->rfd = option; | |
1236 | break; | |
1237 | case Opt_wfdno: | |
1238 | opts->wfd = option; | |
1239 | break; | |
1240 | default: | |
1241 | continue; | |
1242 | } | |
bd238fb4 | 1243 | } |
bd238fb4 | 1244 | } |
bd238fb4 | 1245 | |
a80d923e | 1246 | static int p9_fd_open(struct p9_trans *trans, int rfd, int wfd) |
bd238fb4 | 1247 | { |
a80d923e EVH |
1248 | struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), |
1249 | GFP_KERNEL); | |
1250 | if (!ts) | |
1251 | return -ENOMEM; | |
bd238fb4 | 1252 | |
a80d923e EVH |
1253 | ts->rd = fget(rfd); |
1254 | ts->wr = fget(wfd); | |
1255 | if (!ts->rd || !ts->wr) { | |
1256 | if (ts->rd) | |
1257 | fput(ts->rd); | |
1258 | if (ts->wr) | |
1259 | fput(ts->wr); | |
1260 | kfree(ts); | |
1261 | return -EIO; | |
bd238fb4 LI |
1262 | } |
1263 | ||
a80d923e EVH |
1264 | trans->priv = ts; |
1265 | trans->status = Connected; | |
bd238fb4 | 1266 | |
a80d923e | 1267 | return 0; |
bd238fb4 | 1268 | } |
bd238fb4 | 1269 | |
a80d923e | 1270 | static int p9_socket_open(struct p9_trans *trans, struct socket *csocket) |
bd238fb4 LI |
1271 | { |
1272 | int fd, ret; | |
1273 | ||
1274 | csocket->sk->sk_allocation = GFP_NOIO; | |
1275 | fd = sock_map_fd(csocket); | |
1276 | if (fd < 0) { | |
1277 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n"); | |
1278 | return fd; | |
1279 | } | |
1280 | ||
1281 | ret = p9_fd_open(trans, fd, fd); | |
1282 | if (ret < 0) { | |
1283 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n"); | |
1284 | sockfd_put(csocket); | |
1285 | return ret; | |
1286 | } | |
1287 | ||
1288 | ((struct p9_trans_fd *)trans->priv)->rd->f_flags |= O_NONBLOCK; | |
1289 | ||
1290 | return 0; | |
1291 | } | |
1292 | ||
bd238fb4 LI |
1293 | /** |
1294 | * p9_fd_read- read from a fd | |
ee443996 | 1295 | * @trans: transport instance state |
bd238fb4 LI |
1296 | * @v: buffer to receive data into |
1297 | * @len: size of receive buffer | |
1298 | * | |
1299 | */ | |
ee443996 | 1300 | |
a80d923e | 1301 | static int p9_fd_read(struct p9_trans *trans, void *v, int len) |
bd238fb4 LI |
1302 | { |
1303 | int ret; | |
1304 | struct p9_trans_fd *ts = NULL; | |
1305 | ||
1306 | if (trans && trans->status != Disconnected) | |
1307 | ts = trans->priv; | |
1308 | ||
1309 | if (!ts) | |
1310 | return -EREMOTEIO; | |
1311 | ||
1312 | if (!(ts->rd->f_flags & O_NONBLOCK)) | |
1313 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n"); | |
1314 | ||
1315 | ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); | |
1316 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
1317 | trans->status = Disconnected; | |
1318 | return ret; | |
1319 | } | |
1320 | ||
1321 | /** | |
1322 | * p9_fd_write - write to a socket | |
ee443996 | 1323 | * @trans: transport instance state |
bd238fb4 LI |
1324 | * @v: buffer to send data from |
1325 | * @len: size of send buffer | |
1326 | * | |
1327 | */ | |
ee443996 | 1328 | |
a80d923e | 1329 | static int p9_fd_write(struct p9_trans *trans, void *v, int len) |
bd238fb4 LI |
1330 | { |
1331 | int ret; | |
1332 | mm_segment_t oldfs; | |
1333 | struct p9_trans_fd *ts = NULL; | |
1334 | ||
1335 | if (trans && trans->status != Disconnected) | |
1336 | ts = trans->priv; | |
1337 | ||
1338 | if (!ts) | |
1339 | return -EREMOTEIO; | |
1340 | ||
1341 | if (!(ts->wr->f_flags & O_NONBLOCK)) | |
1342 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n"); | |
1343 | ||
1344 | oldfs = get_fs(); | |
1345 | set_fs(get_ds()); | |
1346 | /* The cast to a user pointer is valid due to the set_fs() */ | |
1347 | ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos); | |
1348 | set_fs(oldfs); | |
1349 | ||
1350 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
1351 | trans->status = Disconnected; | |
1352 | return ret; | |
1353 | } | |
1354 | ||
1355 | static unsigned int | |
a80d923e | 1356 | p9_fd_poll(struct p9_trans *trans, struct poll_table_struct *pt) |
bd238fb4 LI |
1357 | { |
1358 | int ret, n; | |
1359 | struct p9_trans_fd *ts = NULL; | |
1360 | mm_segment_t oldfs; | |
1361 | ||
1362 | if (trans && trans->status == Connected) | |
1363 | ts = trans->priv; | |
1364 | ||
1365 | if (!ts) | |
1366 | return -EREMOTEIO; | |
1367 | ||
1368 | if (!ts->rd->f_op || !ts->rd->f_op->poll) | |
1369 | return -EIO; | |
1370 | ||
1371 | if (!ts->wr->f_op || !ts->wr->f_op->poll) | |
1372 | return -EIO; | |
1373 | ||
1374 | oldfs = get_fs(); | |
1375 | set_fs(get_ds()); | |
1376 | ||
1377 | ret = ts->rd->f_op->poll(ts->rd, pt); | |
1378 | if (ret < 0) | |
1379 | goto end; | |
1380 | ||
1381 | if (ts->rd != ts->wr) { | |
1382 | n = ts->wr->f_op->poll(ts->wr, pt); | |
1383 | if (n < 0) { | |
1384 | ret = n; | |
1385 | goto end; | |
1386 | } | |
1387 | ret = (ret & ~POLLOUT) | (n & ~POLLIN); | |
1388 | } | |
1389 | ||
1390 | end: | |
1391 | set_fs(oldfs); | |
1392 | return ret; | |
1393 | } | |
1394 | ||
1395 | /** | |
8a0dc95f | 1396 | * p9_fd_close - shutdown socket |
bd238fb4 LI |
1397 | * @trans: private socket structure |
1398 | * | |
1399 | */ | |
ee443996 | 1400 | |
a80d923e | 1401 | static void p9_fd_close(struct p9_trans *trans) |
bd238fb4 LI |
1402 | { |
1403 | struct p9_trans_fd *ts; | |
1404 | ||
1405 | if (!trans) | |
1406 | return; | |
1407 | ||
1408 | ts = xchg(&trans->priv, NULL); | |
1409 | ||
1410 | if (!ts) | |
1411 | return; | |
1412 | ||
8a0dc95f EVH |
1413 | p9_conn_destroy(ts->conn); |
1414 | ||
bd238fb4 LI |
1415 | trans->status = Disconnected; |
1416 | if (ts->rd) | |
1417 | fput(ts->rd); | |
1418 | if (ts->wr) | |
1419 | fput(ts->wr); | |
1420 | kfree(ts); | |
1421 | } | |
1422 | ||
8a0dc95f EVH |
1423 | static struct p9_trans * |
1424 | p9_trans_create_tcp(const char *addr, char *args, int msize, unsigned char dotu) | |
a80d923e EVH |
1425 | { |
1426 | int err; | |
1427 | struct p9_trans *trans; | |
1428 | struct socket *csocket; | |
1429 | struct sockaddr_in sin_server; | |
1430 | struct p9_fd_opts opts; | |
8a0dc95f | 1431 | struct p9_trans_fd *p; |
a80d923e EVH |
1432 | |
1433 | parse_opts(args, &opts); | |
1434 | ||
1435 | csocket = NULL; | |
1436 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); | |
1437 | if (!trans) | |
1438 | return ERR_PTR(-ENOMEM); | |
8a0dc95f EVH |
1439 | trans->msize = msize; |
1440 | trans->extended = dotu; | |
1441 | trans->rpc = p9_fd_rpc; | |
a80d923e | 1442 | trans->close = p9_fd_close; |
a80d923e EVH |
1443 | |
1444 | sin_server.sin_family = AF_INET; | |
1445 | sin_server.sin_addr.s_addr = in_aton(addr); | |
1446 | sin_server.sin_port = htons(opts.port); | |
1447 | sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket); | |
1448 | ||
1449 | if (!csocket) { | |
1450 | P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n"); | |
1451 | err = -EIO; | |
1452 | goto error; | |
1453 | } | |
1454 | ||
1455 | err = csocket->ops->connect(csocket, | |
1456 | (struct sockaddr *)&sin_server, | |
1457 | sizeof(struct sockaddr_in), 0); | |
1458 | if (err < 0) { | |
1459 | P9_EPRINTK(KERN_ERR, | |
1460 | "p9_trans_tcp: problem connecting socket to %s\n", | |
1461 | addr); | |
1462 | goto error; | |
1463 | } | |
1464 | ||
1465 | err = p9_socket_open(trans, csocket); | |
1466 | if (err < 0) | |
1467 | goto error; | |
1468 | ||
8a0dc95f EVH |
1469 | p = (struct p9_trans_fd *) trans->priv; |
1470 | p->conn = p9_conn_create(trans); | |
1471 | if (IS_ERR(p->conn)) { | |
1472 | err = PTR_ERR(p->conn); | |
1473 | p->conn = NULL; | |
1474 | goto error; | |
1475 | } | |
1476 | ||
a80d923e EVH |
1477 | return trans; |
1478 | ||
1479 | error: | |
1480 | if (csocket) | |
1481 | sock_release(csocket); | |
1482 | ||
1483 | kfree(trans); | |
1484 | return ERR_PTR(err); | |
1485 | } | |
1486 | ||
8a0dc95f EVH |
1487 | static struct p9_trans * |
1488 | p9_trans_create_unix(const char *addr, char *args, int msize, | |
1489 | unsigned char dotu) | |
a80d923e EVH |
1490 | { |
1491 | int err; | |
1492 | struct socket *csocket; | |
1493 | struct sockaddr_un sun_server; | |
1494 | struct p9_trans *trans; | |
8a0dc95f | 1495 | struct p9_trans_fd *p; |
a80d923e EVH |
1496 | |
1497 | csocket = NULL; | |
1498 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); | |
1499 | if (!trans) | |
1500 | return ERR_PTR(-ENOMEM); | |
1501 | ||
8a0dc95f | 1502 | trans->rpc = p9_fd_rpc; |
a80d923e | 1503 | trans->close = p9_fd_close; |
a80d923e EVH |
1504 | |
1505 | if (strlen(addr) > UNIX_PATH_MAX) { | |
1506 | P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n", | |
1507 | addr); | |
1508 | err = -ENAMETOOLONG; | |
1509 | goto error; | |
1510 | } | |
1511 | ||
1512 | sun_server.sun_family = PF_UNIX; | |
1513 | strcpy(sun_server.sun_path, addr); | |
1514 | sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket); | |
1515 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, | |
1516 | sizeof(struct sockaddr_un) - 1, 0); | |
1517 | if (err < 0) { | |
1518 | P9_EPRINTK(KERN_ERR, | |
1519 | "p9_trans_unix: problem connecting socket: %s: %d\n", | |
1520 | addr, err); | |
1521 | goto error; | |
1522 | } | |
1523 | ||
1524 | err = p9_socket_open(trans, csocket); | |
1525 | if (err < 0) | |
1526 | goto error; | |
1527 | ||
8a0dc95f EVH |
1528 | trans->msize = msize; |
1529 | trans->extended = dotu; | |
1530 | p = (struct p9_trans_fd *) trans->priv; | |
1531 | p->conn = p9_conn_create(trans); | |
1532 | if (IS_ERR(p->conn)) { | |
1533 | err = PTR_ERR(p->conn); | |
1534 | p->conn = NULL; | |
1535 | goto error; | |
1536 | } | |
1537 | ||
a80d923e EVH |
1538 | return trans; |
1539 | ||
1540 | error: | |
1541 | if (csocket) | |
1542 | sock_release(csocket); | |
1543 | ||
1544 | kfree(trans); | |
1545 | return ERR_PTR(err); | |
1546 | } | |
1547 | ||
8a0dc95f EVH |
1548 | static struct p9_trans * |
1549 | p9_trans_create_fd(const char *name, char *args, int msize, | |
1550 | unsigned char extended) | |
a80d923e EVH |
1551 | { |
1552 | int err; | |
1553 | struct p9_trans *trans; | |
1554 | struct p9_fd_opts opts; | |
8a0dc95f | 1555 | struct p9_trans_fd *p; |
a80d923e EVH |
1556 | |
1557 | parse_opts(args, &opts); | |
1558 | ||
1559 | if (opts.rfd == ~0 || opts.wfd == ~0) { | |
1560 | printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); | |
1561 | return ERR_PTR(-ENOPROTOOPT); | |
1562 | } | |
1563 | ||
1564 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); | |
1565 | if (!trans) | |
1566 | return ERR_PTR(-ENOMEM); | |
1567 | ||
8a0dc95f | 1568 | trans->rpc = p9_fd_rpc; |
a80d923e | 1569 | trans->close = p9_fd_close; |
a80d923e EVH |
1570 | |
1571 | err = p9_fd_open(trans, opts.rfd, opts.wfd); | |
1572 | if (err < 0) | |
1573 | goto error; | |
1574 | ||
8a0dc95f EVH |
1575 | trans->msize = msize; |
1576 | trans->extended = extended; | |
1577 | p = (struct p9_trans_fd *) trans->priv; | |
1578 | p->conn = p9_conn_create(trans); | |
1579 | if (IS_ERR(p->conn)) { | |
1580 | err = PTR_ERR(p->conn); | |
1581 | p->conn = NULL; | |
1582 | goto error; | |
1583 | } | |
1584 | ||
a80d923e EVH |
1585 | return trans; |
1586 | ||
1587 | error: | |
1588 | kfree(trans); | |
1589 | return ERR_PTR(err); | |
1590 | } | |
1591 | ||
1592 | static struct p9_trans_module p9_tcp_trans = { | |
1593 | .name = "tcp", | |
1594 | .maxsize = MAX_SOCK_BUF, | |
1595 | .def = 1, | |
1596 | .create = p9_trans_create_tcp, | |
1597 | }; | |
1598 | ||
1599 | static struct p9_trans_module p9_unix_trans = { | |
1600 | .name = "unix", | |
1601 | .maxsize = MAX_SOCK_BUF, | |
1602 | .def = 0, | |
1603 | .create = p9_trans_create_unix, | |
1604 | }; | |
1605 | ||
1606 | static struct p9_trans_module p9_fd_trans = { | |
1607 | .name = "fd", | |
1608 | .maxsize = MAX_SOCK_BUF, | |
1609 | .def = 0, | |
1610 | .create = p9_trans_create_fd, | |
1611 | }; | |
1612 | ||
1613 | static int __init p9_trans_fd_init(void) | |
1614 | { | |
8a0dc95f EVH |
1615 | int ret = p9_mux_global_init(); |
1616 | if (ret) { | |
1617 | printk(KERN_WARNING "9p: starting mux failed\n"); | |
1618 | return ret; | |
1619 | } | |
1620 | ||
a80d923e EVH |
1621 | v9fs_register_trans(&p9_tcp_trans); |
1622 | v9fs_register_trans(&p9_unix_trans); | |
1623 | v9fs_register_trans(&p9_fd_trans); | |
1624 | ||
3387b804 | 1625 | return 0; |
a80d923e EVH |
1626 | } |
1627 | ||
a80d923e | 1628 | module_init(p9_trans_fd_init); |
a80d923e EVH |
1629 | |
1630 | MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>"); | |
1631 | MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>"); | |
1632 | MODULE_LICENSE("GPL"); |