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 | |
ee443996 EVH |
154 | * @req_list: accounting for requests which have been sent |
155 | * @unsent_req_list: accounting for requests that haven't been sent | |
156 | * @rcall: current response &p9_fcall structure | |
157 | * @rpos: read position in current frame | |
158 | * @rbuf: current read buffer | |
159 | * @wpos: write position for current frame | |
160 | * @wsize: amount of data to write for current frame | |
161 | * @wbuf: current write buffer | |
162 | * @poll_wait: array of wait_q's for various worker threads | |
163 | * @poll_waddr: ???? | |
164 | * @pt: poll state | |
165 | * @rq: current read work | |
166 | * @wq: current write work | |
167 | * @wsched: ???? | |
168 | * | |
169 | */ | |
8a0dc95f EVH |
170 | |
171 | struct p9_conn { | |
172 | spinlock_t lock; /* protect lock structure */ | |
173 | struct list_head mux_list; | |
174 | struct p9_mux_poll_task *poll_task; | |
175 | int msize; | |
176 | unsigned char extended; | |
177 | struct p9_trans *trans; | |
178 | struct p9_idpool *tagpool; | |
179 | int err; | |
8a0dc95f EVH |
180 | struct list_head req_list; |
181 | struct list_head unsent_req_list; | |
182 | struct p9_fcall *rcall; | |
183 | int rpos; | |
184 | char *rbuf; | |
185 | int wpos; | |
186 | int wsize; | |
187 | char *wbuf; | |
188 | wait_queue_t poll_wait[MAXPOLLWADDR]; | |
189 | wait_queue_head_t *poll_waddr[MAXPOLLWADDR]; | |
190 | poll_table pt; | |
191 | struct work_struct rq; | |
192 | struct work_struct wq; | |
193 | unsigned long wsched; | |
194 | }; | |
195 | ||
ee443996 EVH |
196 | /** |
197 | * struct p9_mux_rpc - fd mux rpc accounting structure | |
198 | * @m: connection this request was issued on | |
199 | * @err: error state | |
200 | * @tcall: request &p9_fcall | |
201 | * @rcall: response &p9_fcall | |
202 | * @wqueue: wait queue that client is blocked on for this rpc | |
203 | * | |
204 | * Bug: isn't this information duplicated elsewhere like &p9_req | |
205 | */ | |
8a0dc95f EVH |
206 | |
207 | struct p9_mux_rpc { | |
208 | struct p9_conn *m; | |
209 | int err; | |
210 | struct p9_fcall *tcall; | |
211 | struct p9_fcall *rcall; | |
212 | wait_queue_head_t wqueue; | |
213 | }; | |
214 | ||
215 | static int p9_poll_proc(void *); | |
216 | static void p9_read_work(struct work_struct *work); | |
217 | static void p9_write_work(struct work_struct *work); | |
218 | static void p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, | |
219 | poll_table *p); | |
220 | static int p9_fd_write(struct p9_trans *trans, void *v, int len); | |
221 | static int p9_fd_read(struct p9_trans *trans, void *v, int len); | |
222 | ||
223 | static DEFINE_MUTEX(p9_mux_task_lock); | |
224 | static struct workqueue_struct *p9_mux_wq; | |
225 | ||
226 | static int p9_mux_num; | |
227 | static int p9_mux_poll_task_num; | |
228 | static struct p9_mux_poll_task p9_mux_poll_tasks[100]; | |
229 | ||
230 | static void p9_conn_destroy(struct p9_conn *); | |
231 | static unsigned int p9_fd_poll(struct p9_trans *trans, | |
232 | struct poll_table_struct *pt); | |
233 | ||
234 | #ifdef P9_NONBLOCK | |
235 | static int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc, | |
236 | p9_conn_req_callback cb, void *a); | |
237 | #endif /* P9_NONBLOCK */ | |
238 | ||
239 | static void p9_conn_cancel(struct p9_conn *m, int err); | |
240 | ||
8a0dc95f EVH |
241 | static u16 p9_mux_get_tag(struct p9_conn *m) |
242 | { | |
243 | int tag; | |
244 | ||
245 | tag = p9_idpool_get(m->tagpool); | |
246 | if (tag < 0) | |
247 | return P9_NOTAG; | |
248 | else | |
249 | return (u16) tag; | |
250 | } | |
251 | ||
252 | static void p9_mux_put_tag(struct p9_conn *m, u16 tag) | |
253 | { | |
254 | if (tag != P9_NOTAG && p9_idpool_check(tag, m->tagpool)) | |
255 | p9_idpool_put(tag, m->tagpool); | |
256 | } | |
257 | ||
258 | /** | |
259 | * p9_mux_calc_poll_procs - calculates the number of polling procs | |
ee443996 | 260 | * @muxnum: number of mounts |
8a0dc95f | 261 | * |
ee443996 | 262 | * Calculation is based on the number of mounted v9fs filesystems. |
8a0dc95f EVH |
263 | * The current implementation returns sqrt of the number of mounts. |
264 | */ | |
ee443996 | 265 | |
8a0dc95f EVH |
266 | static int p9_mux_calc_poll_procs(int muxnum) |
267 | { | |
268 | int n; | |
269 | ||
270 | if (p9_mux_poll_task_num) | |
271 | n = muxnum / p9_mux_poll_task_num + | |
272 | (muxnum % p9_mux_poll_task_num ? 1 : 0); | |
273 | else | |
274 | n = 1; | |
275 | ||
276 | if (n > ARRAY_SIZE(p9_mux_poll_tasks)) | |
277 | n = ARRAY_SIZE(p9_mux_poll_tasks); | |
278 | ||
279 | return n; | |
280 | } | |
281 | ||
282 | static int p9_mux_poll_start(struct p9_conn *m) | |
283 | { | |
284 | int i, n; | |
285 | struct p9_mux_poll_task *vpt, *vptlast; | |
286 | struct task_struct *pproc; | |
287 | ||
288 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p muxnum %d procnum %d\n", m, p9_mux_num, | |
289 | p9_mux_poll_task_num); | |
290 | mutex_lock(&p9_mux_task_lock); | |
291 | ||
292 | n = p9_mux_calc_poll_procs(p9_mux_num + 1); | |
293 | if (n > p9_mux_poll_task_num) { | |
294 | for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) { | |
295 | if (p9_mux_poll_tasks[i].task == NULL) { | |
296 | vpt = &p9_mux_poll_tasks[i]; | |
297 | P9_DPRINTK(P9_DEBUG_MUX, "create proc %p\n", | |
298 | vpt); | |
299 | pproc = kthread_create(p9_poll_proc, vpt, | |
300 | "v9fs-poll"); | |
301 | ||
302 | if (!IS_ERR(pproc)) { | |
303 | vpt->task = pproc; | |
304 | INIT_LIST_HEAD(&vpt->mux_list); | |
305 | vpt->muxnum = 0; | |
306 | p9_mux_poll_task_num++; | |
307 | wake_up_process(vpt->task); | |
308 | } | |
309 | break; | |
310 | } | |
311 | } | |
312 | ||
313 | if (i >= ARRAY_SIZE(p9_mux_poll_tasks)) | |
314 | P9_DPRINTK(P9_DEBUG_ERROR, | |
315 | "warning: no free poll slots\n"); | |
316 | } | |
317 | ||
318 | n = (p9_mux_num + 1) / p9_mux_poll_task_num + | |
319 | ((p9_mux_num + 1) % p9_mux_poll_task_num ? 1 : 0); | |
320 | ||
321 | vptlast = NULL; | |
322 | for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) { | |
323 | vpt = &p9_mux_poll_tasks[i]; | |
324 | if (vpt->task != NULL) { | |
325 | vptlast = vpt; | |
326 | if (vpt->muxnum < n) { | |
327 | P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i); | |
328 | list_add(&m->mux_list, &vpt->mux_list); | |
329 | vpt->muxnum++; | |
330 | m->poll_task = vpt; | |
331 | memset(&m->poll_waddr, 0, | |
332 | sizeof(m->poll_waddr)); | |
333 | init_poll_funcptr(&m->pt, p9_pollwait); | |
334 | break; | |
335 | } | |
336 | } | |
337 | } | |
338 | ||
339 | if (i >= ARRAY_SIZE(p9_mux_poll_tasks)) { | |
340 | if (vptlast == NULL) { | |
341 | mutex_unlock(&p9_mux_task_lock); | |
342 | return -ENOMEM; | |
343 | } | |
344 | ||
345 | P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i); | |
346 | list_add(&m->mux_list, &vptlast->mux_list); | |
347 | vptlast->muxnum++; | |
348 | m->poll_task = vptlast; | |
349 | memset(&m->poll_waddr, 0, sizeof(m->poll_waddr)); | |
350 | init_poll_funcptr(&m->pt, p9_pollwait); | |
351 | } | |
352 | ||
353 | p9_mux_num++; | |
354 | mutex_unlock(&p9_mux_task_lock); | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
359 | static void p9_mux_poll_stop(struct p9_conn *m) | |
360 | { | |
361 | int i; | |
362 | struct p9_mux_poll_task *vpt; | |
363 | ||
364 | mutex_lock(&p9_mux_task_lock); | |
365 | vpt = m->poll_task; | |
366 | list_del(&m->mux_list); | |
367 | for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) { | |
368 | if (m->poll_waddr[i] != NULL) { | |
369 | remove_wait_queue(m->poll_waddr[i], &m->poll_wait[i]); | |
370 | m->poll_waddr[i] = NULL; | |
371 | } | |
372 | } | |
373 | vpt->muxnum--; | |
374 | if (!vpt->muxnum) { | |
375 | P9_DPRINTK(P9_DEBUG_MUX, "destroy proc %p\n", vpt); | |
376 | kthread_stop(vpt->task); | |
377 | vpt->task = NULL; | |
378 | p9_mux_poll_task_num--; | |
379 | } | |
380 | p9_mux_num--; | |
381 | mutex_unlock(&p9_mux_task_lock); | |
382 | } | |
383 | ||
384 | /** | |
385 | * p9_conn_create - allocate and initialize the per-session mux data | |
ee443996 | 386 | * @trans: transport structure |
8a0dc95f | 387 | * |
ee443996 | 388 | * Note: Creates the polling task if this is the first session. |
8a0dc95f | 389 | */ |
ee443996 | 390 | |
8a0dc95f EVH |
391 | static struct p9_conn *p9_conn_create(struct p9_trans *trans) |
392 | { | |
393 | int i, n; | |
571ffeaf | 394 | struct p9_conn *m; |
8a0dc95f EVH |
395 | |
396 | P9_DPRINTK(P9_DEBUG_MUX, "transport %p msize %d\n", trans, | |
397 | trans->msize); | |
571ffeaf | 398 | m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL); |
8a0dc95f EVH |
399 | if (!m) |
400 | return ERR_PTR(-ENOMEM); | |
401 | ||
402 | spin_lock_init(&m->lock); | |
403 | INIT_LIST_HEAD(&m->mux_list); | |
404 | m->msize = trans->msize; | |
405 | m->extended = trans->extended; | |
406 | m->trans = trans; | |
407 | m->tagpool = p9_idpool_create(); | |
408 | if (IS_ERR(m->tagpool)) { | |
8a0dc95f | 409 | kfree(m); |
571ffeaf | 410 | return ERR_PTR(-ENOMEM); |
8a0dc95f EVH |
411 | } |
412 | ||
8a0dc95f EVH |
413 | INIT_LIST_HEAD(&m->req_list); |
414 | INIT_LIST_HEAD(&m->unsent_req_list); | |
8a0dc95f EVH |
415 | INIT_WORK(&m->rq, p9_read_work); |
416 | INIT_WORK(&m->wq, p9_write_work); | |
8a0dc95f EVH |
417 | n = p9_mux_poll_start(m); |
418 | if (n) { | |
419 | kfree(m); | |
420 | return ERR_PTR(n); | |
421 | } | |
422 | ||
423 | n = p9_fd_poll(trans, &m->pt); | |
424 | if (n & POLLIN) { | |
425 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); | |
426 | set_bit(Rpending, &m->wsched); | |
427 | } | |
428 | ||
429 | if (n & POLLOUT) { | |
430 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); | |
431 | set_bit(Wpending, &m->wsched); | |
432 | } | |
433 | ||
434 | for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) { | |
435 | if (IS_ERR(m->poll_waddr[i])) { | |
436 | p9_mux_poll_stop(m); | |
8a0dc95f | 437 | kfree(m); |
571ffeaf | 438 | return (void *)m->poll_waddr; /* the error code */ |
8a0dc95f EVH |
439 | } |
440 | } | |
441 | ||
442 | return m; | |
443 | } | |
444 | ||
445 | /** | |
446 | * p9_mux_destroy - cancels all pending requests and frees mux resources | |
ee443996 EVH |
447 | * @m: mux to destroy |
448 | * | |
8a0dc95f | 449 | */ |
ee443996 | 450 | |
8a0dc95f EVH |
451 | static void p9_conn_destroy(struct p9_conn *m) |
452 | { | |
453 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m, | |
454 | m->mux_list.prev, m->mux_list.next); | |
8a0dc95f EVH |
455 | |
456 | p9_mux_poll_stop(m); | |
7dc5d24b TH |
457 | cancel_work_sync(&m->rq); |
458 | cancel_work_sync(&m->wq); | |
459 | ||
460 | p9_conn_cancel(m, -ECONNRESET); | |
461 | ||
8a0dc95f EVH |
462 | m->trans = NULL; |
463 | p9_idpool_destroy(m->tagpool); | |
464 | kfree(m); | |
465 | } | |
466 | ||
467 | /** | |
ee443996 EVH |
468 | * p9_pollwait - add poll task to the wait queue |
469 | * @filp: file pointer being polled | |
470 | * @wait_address: wait_q to block on | |
471 | * @p: poll state | |
472 | * | |
473 | * called by files poll operation to add v9fs-poll task to files wait queue | |
8a0dc95f | 474 | */ |
ee443996 | 475 | |
8a0dc95f EVH |
476 | static void |
477 | p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) | |
478 | { | |
479 | int i; | |
480 | struct p9_conn *m; | |
481 | ||
482 | m = container_of(p, struct p9_conn, pt); | |
483 | for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) | |
484 | if (m->poll_waddr[i] == NULL) | |
485 | break; | |
486 | ||
487 | if (i >= ARRAY_SIZE(m->poll_waddr)) { | |
488 | P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n"); | |
489 | return; | |
490 | } | |
491 | ||
492 | m->poll_waddr[i] = wait_address; | |
493 | ||
494 | if (!wait_address) { | |
495 | P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n"); | |
496 | m->poll_waddr[i] = ERR_PTR(-EIO); | |
497 | return; | |
498 | } | |
499 | ||
500 | init_waitqueue_entry(&m->poll_wait[i], m->poll_task->task); | |
501 | add_wait_queue(wait_address, &m->poll_wait[i]); | |
502 | } | |
503 | ||
504 | /** | |
505 | * p9_poll_mux - polls a mux and schedules read or write works if necessary | |
ee443996 EVH |
506 | * @m: connection to poll |
507 | * | |
8a0dc95f | 508 | */ |
ee443996 | 509 | |
8a0dc95f EVH |
510 | static void p9_poll_mux(struct p9_conn *m) |
511 | { | |
512 | int n; | |
513 | ||
514 | if (m->err < 0) | |
515 | return; | |
516 | ||
517 | n = p9_fd_poll(m->trans, NULL); | |
518 | if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { | |
519 | P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n); | |
520 | if (n >= 0) | |
521 | n = -ECONNRESET; | |
522 | p9_conn_cancel(m, n); | |
523 | } | |
524 | ||
525 | if (n & POLLIN) { | |
526 | set_bit(Rpending, &m->wsched); | |
527 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); | |
528 | if (!test_and_set_bit(Rworksched, &m->wsched)) { | |
529 | P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); | |
530 | queue_work(p9_mux_wq, &m->rq); | |
531 | } | |
532 | } | |
533 | ||
534 | if (n & POLLOUT) { | |
535 | set_bit(Wpending, &m->wsched); | |
536 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); | |
537 | if ((m->wsize || !list_empty(&m->unsent_req_list)) | |
538 | && !test_and_set_bit(Wworksched, &m->wsched)) { | |
539 | P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); | |
540 | queue_work(p9_mux_wq, &m->wq); | |
541 | } | |
542 | } | |
543 | } | |
544 | ||
545 | /** | |
ee443996 EVH |
546 | * p9_poll_proc - poll worker thread |
547 | * @a: thread state and arguments | |
548 | * | |
549 | * polls all v9fs transports for new events and queues the appropriate | |
550 | * work to the work queue | |
551 | * | |
8a0dc95f | 552 | */ |
ee443996 | 553 | |
8a0dc95f EVH |
554 | static int p9_poll_proc(void *a) |
555 | { | |
556 | struct p9_conn *m, *mtmp; | |
557 | struct p9_mux_poll_task *vpt; | |
558 | ||
559 | vpt = a; | |
560 | P9_DPRINTK(P9_DEBUG_MUX, "start %p %p\n", current, vpt); | |
561 | while (!kthread_should_stop()) { | |
562 | set_current_state(TASK_INTERRUPTIBLE); | |
563 | ||
564 | list_for_each_entry_safe(m, mtmp, &vpt->mux_list, mux_list) { | |
565 | p9_poll_mux(m); | |
566 | } | |
567 | ||
568 | P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n"); | |
569 | schedule_timeout(SCHED_TIMEOUT * HZ); | |
570 | } | |
571 | ||
572 | __set_current_state(TASK_RUNNING); | |
573 | P9_DPRINTK(P9_DEBUG_MUX, "finish\n"); | |
574 | return 0; | |
575 | } | |
576 | ||
577 | /** | |
578 | * p9_write_work - called when a transport can send some data | |
ee443996 EVH |
579 | * @work: container for work to be done |
580 | * | |
8a0dc95f | 581 | */ |
ee443996 | 582 | |
8a0dc95f EVH |
583 | static void p9_write_work(struct work_struct *work) |
584 | { | |
585 | int n, err; | |
586 | struct p9_conn *m; | |
587 | struct p9_req *req; | |
588 | ||
589 | m = container_of(work, struct p9_conn, wq); | |
590 | ||
591 | if (m->err < 0) { | |
592 | clear_bit(Wworksched, &m->wsched); | |
593 | return; | |
594 | } | |
595 | ||
596 | if (!m->wsize) { | |
597 | if (list_empty(&m->unsent_req_list)) { | |
598 | clear_bit(Wworksched, &m->wsched); | |
599 | return; | |
600 | } | |
601 | ||
602 | spin_lock(&m->lock); | |
603 | again: | |
604 | req = list_entry(m->unsent_req_list.next, struct p9_req, | |
605 | req_list); | |
606 | list_move_tail(&req->req_list, &m->req_list); | |
607 | if (req->err == ERREQFLUSH) | |
608 | goto again; | |
609 | ||
610 | m->wbuf = req->tcall->sdata; | |
611 | m->wsize = req->tcall->size; | |
612 | m->wpos = 0; | |
613 | spin_unlock(&m->lock); | |
614 | } | |
615 | ||
616 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos, | |
617 | m->wsize); | |
618 | clear_bit(Wpending, &m->wsched); | |
619 | err = p9_fd_write(m->trans, m->wbuf + m->wpos, m->wsize - m->wpos); | |
620 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err); | |
621 | if (err == -EAGAIN) { | |
622 | clear_bit(Wworksched, &m->wsched); | |
623 | return; | |
624 | } | |
625 | ||
626 | if (err < 0) | |
627 | goto error; | |
628 | else if (err == 0) { | |
629 | err = -EREMOTEIO; | |
630 | goto error; | |
631 | } | |
632 | ||
633 | m->wpos += err; | |
634 | if (m->wpos == m->wsize) | |
635 | m->wpos = m->wsize = 0; | |
636 | ||
637 | if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) { | |
638 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
639 | n = POLLOUT; | |
640 | else | |
641 | n = p9_fd_poll(m->trans, NULL); | |
642 | ||
643 | if (n & POLLOUT) { | |
644 | P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); | |
645 | queue_work(p9_mux_wq, &m->wq); | |
646 | } else | |
647 | clear_bit(Wworksched, &m->wsched); | |
648 | } else | |
649 | clear_bit(Wworksched, &m->wsched); | |
650 | ||
651 | return; | |
652 | ||
653 | error: | |
654 | p9_conn_cancel(m, err); | |
655 | clear_bit(Wworksched, &m->wsched); | |
656 | } | |
657 | ||
658 | static void process_request(struct p9_conn *m, struct p9_req *req) | |
659 | { | |
660 | int ecode; | |
661 | struct p9_str *ename; | |
662 | ||
663 | if (!req->err && req->rcall->id == P9_RERROR) { | |
664 | ecode = req->rcall->params.rerror.errno; | |
665 | ename = &req->rcall->params.rerror.error; | |
666 | ||
667 | P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len, | |
668 | ename->str); | |
669 | ||
670 | if (m->extended) | |
671 | req->err = -ecode; | |
672 | ||
673 | if (!req->err) { | |
674 | req->err = p9_errstr2errno(ename->str, ename->len); | |
675 | ||
676 | /* string match failed */ | |
677 | if (!req->err) { | |
678 | PRINT_FCALL_ERROR("unknown error", req->rcall); | |
679 | req->err = -ESERVERFAULT; | |
680 | } | |
681 | } | |
682 | } else if (req->tcall && req->rcall->id != req->tcall->id + 1) { | |
683 | P9_DPRINTK(P9_DEBUG_ERROR, | |
684 | "fcall mismatch: expected %d, got %d\n", | |
685 | req->tcall->id + 1, req->rcall->id); | |
686 | if (!req->err) | |
687 | req->err = -EIO; | |
688 | } | |
689 | } | |
690 | ||
691 | /** | |
692 | * p9_read_work - called when there is some data to be read from a transport | |
ee443996 EVH |
693 | * @work: container of work to be done |
694 | * | |
8a0dc95f | 695 | */ |
ee443996 | 696 | |
8a0dc95f EVH |
697 | static void p9_read_work(struct work_struct *work) |
698 | { | |
699 | int n, err; | |
700 | struct p9_conn *m; | |
701 | struct p9_req *req, *rptr, *rreq; | |
702 | struct p9_fcall *rcall; | |
703 | char *rbuf; | |
704 | ||
705 | m = container_of(work, struct p9_conn, rq); | |
706 | ||
707 | if (m->err < 0) | |
708 | return; | |
709 | ||
710 | rcall = NULL; | |
711 | P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos); | |
712 | ||
713 | if (!m->rcall) { | |
714 | m->rcall = | |
715 | kmalloc(sizeof(struct p9_fcall) + m->msize, GFP_KERNEL); | |
716 | if (!m->rcall) { | |
717 | err = -ENOMEM; | |
718 | goto error; | |
719 | } | |
720 | ||
721 | m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall); | |
722 | m->rpos = 0; | |
723 | } | |
724 | ||
725 | clear_bit(Rpending, &m->wsched); | |
726 | err = p9_fd_read(m->trans, m->rbuf + m->rpos, m->msize - m->rpos); | |
727 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err); | |
728 | if (err == -EAGAIN) { | |
729 | clear_bit(Rworksched, &m->wsched); | |
730 | return; | |
731 | } | |
732 | ||
733 | if (err <= 0) | |
734 | goto error; | |
735 | ||
736 | m->rpos += err; | |
737 | while (m->rpos > 4) { | |
738 | n = le32_to_cpu(*(__le32 *) m->rbuf); | |
739 | if (n >= m->msize) { | |
740 | P9_DPRINTK(P9_DEBUG_ERROR, | |
741 | "requested packet size too big: %d\n", n); | |
742 | err = -EIO; | |
743 | goto error; | |
744 | } | |
745 | ||
746 | if (m->rpos < n) | |
747 | break; | |
748 | ||
749 | err = | |
750 | p9_deserialize_fcall(m->rbuf, n, m->rcall, m->extended); | |
751 | if (err < 0) | |
752 | goto error; | |
753 | ||
754 | #ifdef CONFIG_NET_9P_DEBUG | |
755 | if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { | |
756 | char buf[150]; | |
757 | ||
758 | p9_printfcall(buf, sizeof(buf), m->rcall, | |
759 | m->extended); | |
760 | printk(KERN_NOTICE ">>> %p %s\n", m, buf); | |
761 | } | |
762 | #endif | |
763 | ||
764 | rcall = m->rcall; | |
765 | rbuf = m->rbuf; | |
766 | if (m->rpos > n) { | |
767 | m->rcall = kmalloc(sizeof(struct p9_fcall) + m->msize, | |
768 | GFP_KERNEL); | |
769 | if (!m->rcall) { | |
770 | err = -ENOMEM; | |
771 | goto error; | |
772 | } | |
773 | ||
774 | m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall); | |
775 | memmove(m->rbuf, rbuf + n, m->rpos - n); | |
776 | m->rpos -= n; | |
777 | } else { | |
778 | m->rcall = NULL; | |
779 | m->rbuf = NULL; | |
780 | m->rpos = 0; | |
781 | } | |
782 | ||
783 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m, | |
784 | rcall->id, rcall->tag); | |
785 | ||
786 | req = NULL; | |
787 | spin_lock(&m->lock); | |
788 | list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) { | |
789 | if (rreq->tag == rcall->tag) { | |
790 | req = rreq; | |
791 | if (req->flush != Flushing) | |
792 | list_del(&req->req_list); | |
793 | break; | |
794 | } | |
795 | } | |
796 | spin_unlock(&m->lock); | |
797 | ||
798 | if (req) { | |
799 | req->rcall = rcall; | |
800 | process_request(m, req); | |
801 | ||
802 | if (req->flush != Flushing) { | |
803 | if (req->cb) | |
804 | (*req->cb) (req, req->cba); | |
805 | else | |
806 | kfree(req->rcall); | |
8a0dc95f EVH |
807 | } |
808 | } else { | |
809 | if (err >= 0 && rcall->id != P9_RFLUSH) | |
810 | P9_DPRINTK(P9_DEBUG_ERROR, | |
811 | "unexpected response mux %p id %d tag %d\n", | |
812 | m, rcall->id, rcall->tag); | |
813 | kfree(rcall); | |
814 | } | |
815 | } | |
816 | ||
817 | if (!list_empty(&m->req_list)) { | |
818 | if (test_and_clear_bit(Rpending, &m->wsched)) | |
819 | n = POLLIN; | |
820 | else | |
821 | n = p9_fd_poll(m->trans, NULL); | |
822 | ||
823 | if (n & POLLIN) { | |
824 | P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); | |
825 | queue_work(p9_mux_wq, &m->rq); | |
826 | } else | |
827 | clear_bit(Rworksched, &m->wsched); | |
828 | } else | |
829 | clear_bit(Rworksched, &m->wsched); | |
830 | ||
831 | return; | |
832 | ||
833 | error: | |
834 | p9_conn_cancel(m, err); | |
835 | clear_bit(Rworksched, &m->wsched); | |
836 | } | |
837 | ||
838 | /** | |
839 | * p9_send_request - send 9P request | |
840 | * The function can sleep until the request is scheduled for sending. | |
841 | * The function can be interrupted. Return from the function is not | |
842 | * a guarantee that the request is sent successfully. Can return errors | |
843 | * that can be retrieved by PTR_ERR macros. | |
844 | * | |
845 | * @m: mux data | |
846 | * @tc: request to be sent | |
847 | * @cb: callback function to call when response is received | |
848 | * @cba: parameter to pass to the callback function | |
ee443996 | 849 | * |
8a0dc95f | 850 | */ |
ee443996 | 851 | |
8a0dc95f EVH |
852 | static struct p9_req *p9_send_request(struct p9_conn *m, |
853 | struct p9_fcall *tc, | |
854 | p9_conn_req_callback cb, void *cba) | |
855 | { | |
856 | int n; | |
857 | struct p9_req *req; | |
858 | ||
859 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current, | |
860 | tc, tc->id); | |
861 | if (m->err < 0) | |
862 | return ERR_PTR(m->err); | |
863 | ||
864 | req = kmalloc(sizeof(struct p9_req), GFP_KERNEL); | |
865 | if (!req) | |
866 | return ERR_PTR(-ENOMEM); | |
867 | ||
868 | if (tc->id == P9_TVERSION) | |
869 | n = P9_NOTAG; | |
870 | else | |
871 | n = p9_mux_get_tag(m); | |
872 | ||
62067824 JL |
873 | if (n < 0) { |
874 | kfree(req); | |
8a0dc95f | 875 | return ERR_PTR(-ENOMEM); |
62067824 | 876 | } |
8a0dc95f EVH |
877 | |
878 | p9_set_tag(tc, n); | |
879 | ||
880 | #ifdef CONFIG_NET_9P_DEBUG | |
881 | if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { | |
882 | char buf[150]; | |
883 | ||
884 | p9_printfcall(buf, sizeof(buf), tc, m->extended); | |
885 | printk(KERN_NOTICE "<<< %p %s\n", m, buf); | |
886 | } | |
887 | #endif | |
888 | ||
889 | spin_lock_init(&req->lock); | |
890 | req->tag = n; | |
891 | req->tcall = tc; | |
892 | req->rcall = NULL; | |
893 | req->err = 0; | |
894 | req->cb = cb; | |
895 | req->cba = cba; | |
896 | req->flush = None; | |
897 | ||
898 | spin_lock(&m->lock); | |
899 | list_add_tail(&req->req_list, &m->unsent_req_list); | |
900 | spin_unlock(&m->lock); | |
901 | ||
902 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
903 | n = POLLOUT; | |
904 | else | |
905 | n = p9_fd_poll(m->trans, NULL); | |
906 | ||
907 | if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) | |
908 | queue_work(p9_mux_wq, &m->wq); | |
909 | ||
910 | return req; | |
911 | } | |
912 | ||
913 | static void p9_mux_free_request(struct p9_conn *m, struct p9_req *req) | |
914 | { | |
915 | p9_mux_put_tag(m, req->tag); | |
916 | kfree(req); | |
917 | } | |
918 | ||
919 | static void p9_mux_flush_cb(struct p9_req *freq, void *a) | |
920 | { | |
8a0dc95f EVH |
921 | int tag; |
922 | struct p9_conn *m; | |
923 | struct p9_req *req, *rreq, *rptr; | |
924 | ||
925 | m = a; | |
926 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m, | |
927 | freq->tcall, freq->rcall, freq->err, | |
928 | freq->tcall->params.tflush.oldtag); | |
929 | ||
930 | spin_lock(&m->lock); | |
8a0dc95f EVH |
931 | tag = freq->tcall->params.tflush.oldtag; |
932 | req = NULL; | |
933 | list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) { | |
934 | if (rreq->tag == tag) { | |
935 | req = rreq; | |
936 | list_del(&req->req_list); | |
937 | break; | |
938 | } | |
939 | } | |
940 | spin_unlock(&m->lock); | |
941 | ||
942 | if (req) { | |
943 | spin_lock(&req->lock); | |
944 | req->flush = Flushed; | |
945 | spin_unlock(&req->lock); | |
946 | ||
947 | if (req->cb) | |
948 | (*req->cb) (req, req->cba); | |
949 | else | |
950 | kfree(req->rcall); | |
8a0dc95f EVH |
951 | } |
952 | ||
953 | kfree(freq->tcall); | |
954 | kfree(freq->rcall); | |
955 | p9_mux_free_request(m, freq); | |
956 | } | |
957 | ||
958 | static int | |
959 | p9_mux_flush_request(struct p9_conn *m, struct p9_req *req) | |
960 | { | |
961 | struct p9_fcall *fc; | |
962 | struct p9_req *rreq, *rptr; | |
963 | ||
964 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag); | |
965 | ||
966 | /* if a response was received for a request, do nothing */ | |
967 | spin_lock(&req->lock); | |
968 | if (req->rcall || req->err) { | |
969 | spin_unlock(&req->lock); | |
970 | P9_DPRINTK(P9_DEBUG_MUX, | |
971 | "mux %p req %p response already received\n", m, req); | |
972 | return 0; | |
973 | } | |
974 | ||
975 | req->flush = Flushing; | |
976 | spin_unlock(&req->lock); | |
977 | ||
978 | spin_lock(&m->lock); | |
979 | /* if the request is not sent yet, just remove it from the list */ | |
980 | list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) { | |
981 | if (rreq->tag == req->tag) { | |
982 | P9_DPRINTK(P9_DEBUG_MUX, | |
983 | "mux %p req %p request is not sent yet\n", m, req); | |
984 | list_del(&rreq->req_list); | |
985 | req->flush = Flushed; | |
986 | spin_unlock(&m->lock); | |
987 | if (req->cb) | |
988 | (*req->cb) (req, req->cba); | |
989 | return 0; | |
990 | } | |
991 | } | |
992 | spin_unlock(&m->lock); | |
993 | ||
994 | clear_thread_flag(TIF_SIGPENDING); | |
995 | fc = p9_create_tflush(req->tag); | |
996 | p9_send_request(m, fc, p9_mux_flush_cb, m); | |
997 | return 1; | |
998 | } | |
999 | ||
1000 | static void | |
1001 | p9_conn_rpc_cb(struct p9_req *req, void *a) | |
1002 | { | |
1003 | struct p9_mux_rpc *r; | |
1004 | ||
1005 | P9_DPRINTK(P9_DEBUG_MUX, "req %p r %p\n", req, a); | |
1006 | r = a; | |
1007 | r->rcall = req->rcall; | |
1008 | r->err = req->err; | |
1009 | ||
1010 | if (req->flush != None && !req->err) | |
1011 | r->err = -ERESTARTSYS; | |
1012 | ||
1013 | wake_up(&r->wqueue); | |
1014 | } | |
1015 | ||
1016 | /** | |
1017 | * p9_fd_rpc- sends 9P request and waits until a response is available. | |
1018 | * The function can be interrupted. | |
ee443996 | 1019 | * @t: transport data |
8a0dc95f EVH |
1020 | * @tc: request to be sent |
1021 | * @rc: pointer where a pointer to the response is stored | |
ee443996 | 1022 | * |
8a0dc95f | 1023 | */ |
ee443996 | 1024 | |
8a0dc95f EVH |
1025 | int |
1026 | p9_fd_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc) | |
1027 | { | |
1028 | struct p9_trans_fd *p = t->priv; | |
1029 | struct p9_conn *m = p->conn; | |
1030 | int err, sigpending; | |
1031 | unsigned long flags; | |
1032 | struct p9_req *req; | |
1033 | struct p9_mux_rpc r; | |
1034 | ||
1035 | r.err = 0; | |
1036 | r.tcall = tc; | |
1037 | r.rcall = NULL; | |
1038 | r.m = m; | |
1039 | init_waitqueue_head(&r.wqueue); | |
1040 | ||
1041 | if (rc) | |
1042 | *rc = NULL; | |
1043 | ||
1044 | sigpending = 0; | |
1045 | if (signal_pending(current)) { | |
1046 | sigpending = 1; | |
1047 | clear_thread_flag(TIF_SIGPENDING); | |
1048 | } | |
1049 | ||
1050 | req = p9_send_request(m, tc, p9_conn_rpc_cb, &r); | |
1051 | if (IS_ERR(req)) { | |
1052 | err = PTR_ERR(req); | |
1053 | P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err); | |
1054 | return err; | |
1055 | } | |
1056 | ||
1057 | err = wait_event_interruptible(r.wqueue, r.rcall != NULL || r.err < 0); | |
1058 | if (r.err < 0) | |
1059 | err = r.err; | |
1060 | ||
1061 | if (err == -ERESTARTSYS && m->trans->status == Connected | |
1062 | && m->err == 0) { | |
1063 | if (p9_mux_flush_request(m, req)) { | |
1064 | /* wait until we get response of the flush message */ | |
1065 | do { | |
1066 | clear_thread_flag(TIF_SIGPENDING); | |
1067 | err = wait_event_interruptible(r.wqueue, | |
1068 | r.rcall || r.err); | |
1069 | } while (!r.rcall && !r.err && err == -ERESTARTSYS && | |
1070 | m->trans->status == Connected && !m->err); | |
1071 | ||
1072 | err = -ERESTARTSYS; | |
1073 | } | |
1074 | sigpending = 1; | |
1075 | } | |
1076 | ||
1077 | if (sigpending) { | |
1078 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
1079 | recalc_sigpending(); | |
1080 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
1081 | } | |
1082 | ||
1083 | if (rc) | |
1084 | *rc = r.rcall; | |
1085 | else | |
1086 | kfree(r.rcall); | |
1087 | ||
1088 | p9_mux_free_request(m, req); | |
1089 | if (err > 0) | |
1090 | err = -EIO; | |
1091 | ||
1092 | return err; | |
1093 | } | |
1094 | ||
1095 | #ifdef P9_NONBLOCK | |
1096 | /** | |
1097 | * p9_conn_rpcnb - sends 9P request without waiting for response. | |
1098 | * @m: mux data | |
1099 | * @tc: request to be sent | |
1100 | * @cb: callback function to be called when response arrives | |
ee443996 EVH |
1101 | * @a: value to pass to the callback function |
1102 | * | |
8a0dc95f | 1103 | */ |
ee443996 | 1104 | |
8a0dc95f EVH |
1105 | int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc, |
1106 | p9_conn_req_callback cb, void *a) | |
1107 | { | |
1108 | int err; | |
1109 | struct p9_req *req; | |
1110 | ||
1111 | req = p9_send_request(m, tc, cb, a); | |
1112 | if (IS_ERR(req)) { | |
1113 | err = PTR_ERR(req); | |
1114 | P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err); | |
1115 | return PTR_ERR(req); | |
1116 | } | |
1117 | ||
1118 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag); | |
1119 | return 0; | |
1120 | } | |
1121 | #endif /* P9_NONBLOCK */ | |
1122 | ||
1123 | /** | |
1124 | * p9_conn_cancel - cancel all pending requests with error | |
1125 | * @m: mux data | |
1126 | * @err: error code | |
ee443996 | 1127 | * |
8a0dc95f | 1128 | */ |
ee443996 | 1129 | |
8a0dc95f EVH |
1130 | void p9_conn_cancel(struct p9_conn *m, int err) |
1131 | { | |
1132 | struct p9_req *req, *rtmp; | |
1133 | LIST_HEAD(cancel_list); | |
1134 | ||
1135 | P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); | |
1136 | m->err = err; | |
1137 | spin_lock(&m->lock); | |
1138 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { | |
1139 | list_move(&req->req_list, &cancel_list); | |
1140 | } | |
1141 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { | |
1142 | list_move(&req->req_list, &cancel_list); | |
1143 | } | |
1144 | spin_unlock(&m->lock); | |
1145 | ||
1146 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { | |
1147 | list_del(&req->req_list); | |
1148 | if (!req->err) | |
1149 | req->err = err; | |
1150 | ||
1151 | if (req->cb) | |
1152 | (*req->cb) (req, req->cba); | |
1153 | else | |
1154 | kfree(req->rcall); | |
1155 | } | |
8a0dc95f EVH |
1156 | } |
1157 | ||
a80d923e | 1158 | /** |
bb8ffdfc | 1159 | * parse_options - parse mount options into session structure |
a80d923e | 1160 | * @options: options string passed from mount |
ee443996 | 1161 | * @opts: transport-specific structure to parse options into |
a80d923e | 1162 | * |
bb8ffdfc | 1163 | * Returns 0 upon success, -ERRNO upon failure |
a80d923e | 1164 | */ |
bd238fb4 | 1165 | |
bb8ffdfc | 1166 | static int parse_opts(char *params, struct p9_fd_opts *opts) |
bd238fb4 | 1167 | { |
a80d923e EVH |
1168 | char *p; |
1169 | substring_t args[MAX_OPT_ARGS]; | |
1170 | int option; | |
bb8ffdfc | 1171 | char *options; |
a80d923e | 1172 | int ret; |
bd238fb4 | 1173 | |
a80d923e EVH |
1174 | opts->port = P9_PORT; |
1175 | opts->rfd = ~0; | |
1176 | opts->wfd = ~0; | |
bd238fb4 | 1177 | |
bb8ffdfc EVH |
1178 | if (!params) |
1179 | return 0; | |
1180 | ||
1181 | options = kstrdup(params, GFP_KERNEL); | |
1182 | if (!options) { | |
1183 | P9_DPRINTK(P9_DEBUG_ERROR, | |
1184 | "failed to allocate copy of option string\n"); | |
1185 | return -ENOMEM; | |
1186 | } | |
bd238fb4 | 1187 | |
a80d923e EVH |
1188 | while ((p = strsep(&options, ",")) != NULL) { |
1189 | int token; | |
bb8ffdfc | 1190 | int r; |
a80d923e EVH |
1191 | if (!*p) |
1192 | continue; | |
1193 | token = match_token(p, tokens, args); | |
bb8ffdfc EVH |
1194 | r = match_int(&args[0], &option); |
1195 | if (r < 0) { | |
a80d923e EVH |
1196 | P9_DPRINTK(P9_DEBUG_ERROR, |
1197 | "integer field, but no integer?\n"); | |
bb8ffdfc | 1198 | ret = r; |
a80d923e EVH |
1199 | continue; |
1200 | } | |
1201 | switch (token) { | |
1202 | case Opt_port: | |
1203 | opts->port = option; | |
1204 | break; | |
1205 | case Opt_rfdno: | |
1206 | opts->rfd = option; | |
1207 | break; | |
1208 | case Opt_wfdno: | |
1209 | opts->wfd = option; | |
1210 | break; | |
1211 | default: | |
1212 | continue; | |
1213 | } | |
bd238fb4 | 1214 | } |
bb8ffdfc EVH |
1215 | kfree(options); |
1216 | return 0; | |
bd238fb4 | 1217 | } |
bd238fb4 | 1218 | |
a80d923e | 1219 | static int p9_fd_open(struct p9_trans *trans, int rfd, int wfd) |
bd238fb4 | 1220 | { |
a80d923e EVH |
1221 | struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), |
1222 | GFP_KERNEL); | |
1223 | if (!ts) | |
1224 | return -ENOMEM; | |
bd238fb4 | 1225 | |
a80d923e EVH |
1226 | ts->rd = fget(rfd); |
1227 | ts->wr = fget(wfd); | |
1228 | if (!ts->rd || !ts->wr) { | |
1229 | if (ts->rd) | |
1230 | fput(ts->rd); | |
1231 | if (ts->wr) | |
1232 | fput(ts->wr); | |
1233 | kfree(ts); | |
1234 | return -EIO; | |
bd238fb4 LI |
1235 | } |
1236 | ||
a80d923e EVH |
1237 | trans->priv = ts; |
1238 | trans->status = Connected; | |
bd238fb4 | 1239 | |
a80d923e | 1240 | return 0; |
bd238fb4 | 1241 | } |
bd238fb4 | 1242 | |
a80d923e | 1243 | static int p9_socket_open(struct p9_trans *trans, struct socket *csocket) |
bd238fb4 LI |
1244 | { |
1245 | int fd, ret; | |
1246 | ||
1247 | csocket->sk->sk_allocation = GFP_NOIO; | |
a677a039 | 1248 | fd = sock_map_fd(csocket, 0); |
bd238fb4 LI |
1249 | if (fd < 0) { |
1250 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n"); | |
1251 | return fd; | |
1252 | } | |
1253 | ||
1254 | ret = p9_fd_open(trans, fd, fd); | |
1255 | if (ret < 0) { | |
1256 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n"); | |
1257 | sockfd_put(csocket); | |
1258 | return ret; | |
1259 | } | |
1260 | ||
1261 | ((struct p9_trans_fd *)trans->priv)->rd->f_flags |= O_NONBLOCK; | |
1262 | ||
1263 | return 0; | |
1264 | } | |
1265 | ||
bd238fb4 LI |
1266 | /** |
1267 | * p9_fd_read- read from a fd | |
ee443996 | 1268 | * @trans: transport instance state |
bd238fb4 LI |
1269 | * @v: buffer to receive data into |
1270 | * @len: size of receive buffer | |
1271 | * | |
1272 | */ | |
ee443996 | 1273 | |
a80d923e | 1274 | static int p9_fd_read(struct p9_trans *trans, void *v, int len) |
bd238fb4 LI |
1275 | { |
1276 | int ret; | |
1277 | struct p9_trans_fd *ts = NULL; | |
1278 | ||
1279 | if (trans && trans->status != Disconnected) | |
1280 | ts = trans->priv; | |
1281 | ||
1282 | if (!ts) | |
1283 | return -EREMOTEIO; | |
1284 | ||
1285 | if (!(ts->rd->f_flags & O_NONBLOCK)) | |
1286 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n"); | |
1287 | ||
1288 | ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); | |
1289 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
1290 | trans->status = Disconnected; | |
1291 | return ret; | |
1292 | } | |
1293 | ||
1294 | /** | |
1295 | * p9_fd_write - write to a socket | |
ee443996 | 1296 | * @trans: transport instance state |
bd238fb4 LI |
1297 | * @v: buffer to send data from |
1298 | * @len: size of send buffer | |
1299 | * | |
1300 | */ | |
ee443996 | 1301 | |
a80d923e | 1302 | static int p9_fd_write(struct p9_trans *trans, void *v, int len) |
bd238fb4 LI |
1303 | { |
1304 | int ret; | |
1305 | mm_segment_t oldfs; | |
1306 | struct p9_trans_fd *ts = NULL; | |
1307 | ||
1308 | if (trans && trans->status != Disconnected) | |
1309 | ts = trans->priv; | |
1310 | ||
1311 | if (!ts) | |
1312 | return -EREMOTEIO; | |
1313 | ||
1314 | if (!(ts->wr->f_flags & O_NONBLOCK)) | |
1315 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n"); | |
1316 | ||
1317 | oldfs = get_fs(); | |
1318 | set_fs(get_ds()); | |
1319 | /* The cast to a user pointer is valid due to the set_fs() */ | |
1320 | ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos); | |
1321 | set_fs(oldfs); | |
1322 | ||
1323 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
1324 | trans->status = Disconnected; | |
1325 | return ret; | |
1326 | } | |
1327 | ||
1328 | static unsigned int | |
a80d923e | 1329 | p9_fd_poll(struct p9_trans *trans, struct poll_table_struct *pt) |
bd238fb4 LI |
1330 | { |
1331 | int ret, n; | |
1332 | struct p9_trans_fd *ts = NULL; | |
bd238fb4 LI |
1333 | |
1334 | if (trans && trans->status == Connected) | |
1335 | ts = trans->priv; | |
1336 | ||
1337 | if (!ts) | |
1338 | return -EREMOTEIO; | |
1339 | ||
1340 | if (!ts->rd->f_op || !ts->rd->f_op->poll) | |
1341 | return -EIO; | |
1342 | ||
1343 | if (!ts->wr->f_op || !ts->wr->f_op->poll) | |
1344 | return -EIO; | |
1345 | ||
bd238fb4 LI |
1346 | ret = ts->rd->f_op->poll(ts->rd, pt); |
1347 | if (ret < 0) | |
ec3c68f2 | 1348 | return ret; |
bd238fb4 LI |
1349 | |
1350 | if (ts->rd != ts->wr) { | |
1351 | n = ts->wr->f_op->poll(ts->wr, pt); | |
ec3c68f2 TH |
1352 | if (n < 0) |
1353 | return n; | |
bd238fb4 LI |
1354 | ret = (ret & ~POLLOUT) | (n & ~POLLIN); |
1355 | } | |
1356 | ||
bd238fb4 LI |
1357 | return ret; |
1358 | } | |
1359 | ||
1360 | /** | |
8a0dc95f | 1361 | * p9_fd_close - shutdown socket |
bd238fb4 LI |
1362 | * @trans: private socket structure |
1363 | * | |
1364 | */ | |
ee443996 | 1365 | |
a80d923e | 1366 | static void p9_fd_close(struct p9_trans *trans) |
bd238fb4 LI |
1367 | { |
1368 | struct p9_trans_fd *ts; | |
1369 | ||
1370 | if (!trans) | |
1371 | return; | |
1372 | ||
1373 | ts = xchg(&trans->priv, NULL); | |
1374 | ||
1375 | if (!ts) | |
1376 | return; | |
1377 | ||
8a0dc95f EVH |
1378 | p9_conn_destroy(ts->conn); |
1379 | ||
bd238fb4 LI |
1380 | trans->status = Disconnected; |
1381 | if (ts->rd) | |
1382 | fput(ts->rd); | |
1383 | if (ts->wr) | |
1384 | fput(ts->wr); | |
1385 | kfree(ts); | |
1386 | } | |
1387 | ||
887b3ece EVH |
1388 | /* |
1389 | * stolen from NFS - maybe should be made a generic function? | |
1390 | */ | |
1391 | static inline int valid_ipaddr4(const char *buf) | |
1392 | { | |
1393 | int rc, count, in[4]; | |
1394 | ||
1395 | rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); | |
1396 | if (rc != 4) | |
1397 | return -EINVAL; | |
1398 | for (count = 0; count < 4; count++) { | |
1399 | if (in[count] > 255) | |
1400 | return -EINVAL; | |
1401 | } | |
1402 | return 0; | |
1403 | } | |
1404 | ||
8a0dc95f EVH |
1405 | static struct p9_trans * |
1406 | p9_trans_create_tcp(const char *addr, char *args, int msize, unsigned char dotu) | |
a80d923e EVH |
1407 | { |
1408 | int err; | |
1409 | struct p9_trans *trans; | |
1410 | struct socket *csocket; | |
1411 | struct sockaddr_in sin_server; | |
1412 | struct p9_fd_opts opts; | |
8a0dc95f | 1413 | struct p9_trans_fd *p; |
a80d923e | 1414 | |
bb8ffdfc EVH |
1415 | err = parse_opts(args, &opts); |
1416 | if (err < 0) | |
1417 | return ERR_PTR(err); | |
a80d923e | 1418 | |
887b3ece EVH |
1419 | if (valid_ipaddr4(addr) < 0) |
1420 | return ERR_PTR(-EINVAL); | |
1421 | ||
a80d923e EVH |
1422 | csocket = NULL; |
1423 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); | |
1424 | if (!trans) | |
1425 | return ERR_PTR(-ENOMEM); | |
8a0dc95f EVH |
1426 | trans->msize = msize; |
1427 | trans->extended = dotu; | |
1428 | trans->rpc = p9_fd_rpc; | |
a80d923e | 1429 | trans->close = p9_fd_close; |
a80d923e EVH |
1430 | |
1431 | sin_server.sin_family = AF_INET; | |
1432 | sin_server.sin_addr.s_addr = in_aton(addr); | |
1433 | sin_server.sin_port = htons(opts.port); | |
1434 | sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket); | |
1435 | ||
1436 | if (!csocket) { | |
1437 | P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n"); | |
1438 | err = -EIO; | |
1439 | goto error; | |
1440 | } | |
1441 | ||
1442 | err = csocket->ops->connect(csocket, | |
1443 | (struct sockaddr *)&sin_server, | |
1444 | sizeof(struct sockaddr_in), 0); | |
1445 | if (err < 0) { | |
1446 | P9_EPRINTK(KERN_ERR, | |
1447 | "p9_trans_tcp: problem connecting socket to %s\n", | |
1448 | addr); | |
1449 | goto error; | |
1450 | } | |
1451 | ||
1452 | err = p9_socket_open(trans, csocket); | |
1453 | if (err < 0) | |
1454 | goto error; | |
1455 | ||
8a0dc95f EVH |
1456 | p = (struct p9_trans_fd *) trans->priv; |
1457 | p->conn = p9_conn_create(trans); | |
1458 | if (IS_ERR(p->conn)) { | |
1459 | err = PTR_ERR(p->conn); | |
1460 | p->conn = NULL; | |
1461 | goto error; | |
1462 | } | |
1463 | ||
a80d923e EVH |
1464 | return trans; |
1465 | ||
1466 | error: | |
1467 | if (csocket) | |
1468 | sock_release(csocket); | |
1469 | ||
1470 | kfree(trans); | |
1471 | return ERR_PTR(err); | |
1472 | } | |
1473 | ||
8a0dc95f EVH |
1474 | static struct p9_trans * |
1475 | p9_trans_create_unix(const char *addr, char *args, int msize, | |
1476 | unsigned char dotu) | |
a80d923e EVH |
1477 | { |
1478 | int err; | |
1479 | struct socket *csocket; | |
1480 | struct sockaddr_un sun_server; | |
1481 | struct p9_trans *trans; | |
8a0dc95f | 1482 | struct p9_trans_fd *p; |
a80d923e EVH |
1483 | |
1484 | csocket = NULL; | |
1485 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); | |
1486 | if (!trans) | |
1487 | return ERR_PTR(-ENOMEM); | |
1488 | ||
8a0dc95f | 1489 | trans->rpc = p9_fd_rpc; |
a80d923e | 1490 | trans->close = p9_fd_close; |
a80d923e EVH |
1491 | |
1492 | if (strlen(addr) > UNIX_PATH_MAX) { | |
1493 | P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n", | |
1494 | addr); | |
1495 | err = -ENAMETOOLONG; | |
1496 | goto error; | |
1497 | } | |
1498 | ||
1499 | sun_server.sun_family = PF_UNIX; | |
1500 | strcpy(sun_server.sun_path, addr); | |
1501 | sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket); | |
1502 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, | |
1503 | sizeof(struct sockaddr_un) - 1, 0); | |
1504 | if (err < 0) { | |
1505 | P9_EPRINTK(KERN_ERR, | |
1506 | "p9_trans_unix: problem connecting socket: %s: %d\n", | |
1507 | addr, err); | |
1508 | goto error; | |
1509 | } | |
1510 | ||
1511 | err = p9_socket_open(trans, csocket); | |
1512 | if (err < 0) | |
1513 | goto error; | |
1514 | ||
8a0dc95f EVH |
1515 | trans->msize = msize; |
1516 | trans->extended = dotu; | |
1517 | p = (struct p9_trans_fd *) trans->priv; | |
1518 | p->conn = p9_conn_create(trans); | |
1519 | if (IS_ERR(p->conn)) { | |
1520 | err = PTR_ERR(p->conn); | |
1521 | p->conn = NULL; | |
1522 | goto error; | |
1523 | } | |
1524 | ||
a80d923e EVH |
1525 | return trans; |
1526 | ||
1527 | error: | |
1528 | if (csocket) | |
1529 | sock_release(csocket); | |
1530 | ||
1531 | kfree(trans); | |
1532 | return ERR_PTR(err); | |
1533 | } | |
1534 | ||
8a0dc95f EVH |
1535 | static struct p9_trans * |
1536 | p9_trans_create_fd(const char *name, char *args, int msize, | |
1537 | unsigned char extended) | |
a80d923e EVH |
1538 | { |
1539 | int err; | |
1540 | struct p9_trans *trans; | |
1541 | struct p9_fd_opts opts; | |
8a0dc95f | 1542 | struct p9_trans_fd *p; |
a80d923e EVH |
1543 | |
1544 | parse_opts(args, &opts); | |
1545 | ||
1546 | if (opts.rfd == ~0 || opts.wfd == ~0) { | |
1547 | printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); | |
1548 | return ERR_PTR(-ENOPROTOOPT); | |
1549 | } | |
1550 | ||
1551 | trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL); | |
1552 | if (!trans) | |
1553 | return ERR_PTR(-ENOMEM); | |
1554 | ||
8a0dc95f | 1555 | trans->rpc = p9_fd_rpc; |
a80d923e | 1556 | trans->close = p9_fd_close; |
a80d923e EVH |
1557 | |
1558 | err = p9_fd_open(trans, opts.rfd, opts.wfd); | |
1559 | if (err < 0) | |
1560 | goto error; | |
1561 | ||
8a0dc95f EVH |
1562 | trans->msize = msize; |
1563 | trans->extended = extended; | |
1564 | p = (struct p9_trans_fd *) trans->priv; | |
1565 | p->conn = p9_conn_create(trans); | |
1566 | if (IS_ERR(p->conn)) { | |
1567 | err = PTR_ERR(p->conn); | |
1568 | p->conn = NULL; | |
1569 | goto error; | |
1570 | } | |
1571 | ||
a80d923e EVH |
1572 | return trans; |
1573 | ||
1574 | error: | |
1575 | kfree(trans); | |
1576 | return ERR_PTR(err); | |
1577 | } | |
1578 | ||
1579 | static struct p9_trans_module p9_tcp_trans = { | |
1580 | .name = "tcp", | |
1581 | .maxsize = MAX_SOCK_BUF, | |
1582 | .def = 1, | |
1583 | .create = p9_trans_create_tcp, | |
72029fe8 | 1584 | .owner = THIS_MODULE, |
a80d923e EVH |
1585 | }; |
1586 | ||
1587 | static struct p9_trans_module p9_unix_trans = { | |
1588 | .name = "unix", | |
1589 | .maxsize = MAX_SOCK_BUF, | |
1590 | .def = 0, | |
1591 | .create = p9_trans_create_unix, | |
72029fe8 | 1592 | .owner = THIS_MODULE, |
a80d923e EVH |
1593 | }; |
1594 | ||
1595 | static struct p9_trans_module p9_fd_trans = { | |
1596 | .name = "fd", | |
1597 | .maxsize = MAX_SOCK_BUF, | |
1598 | .def = 0, | |
1599 | .create = p9_trans_create_fd, | |
72029fe8 | 1600 | .owner = THIS_MODULE, |
a80d923e EVH |
1601 | }; |
1602 | ||
887b3ece | 1603 | int p9_trans_fd_init(void) |
a80d923e | 1604 | { |
206ca50d TH |
1605 | int i; |
1606 | ||
1607 | for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) | |
1608 | p9_mux_poll_tasks[i].task = NULL; | |
1609 | ||
1610 | p9_mux_wq = create_workqueue("v9fs"); | |
1611 | if (!p9_mux_wq) { | |
1612 | printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n"); | |
1613 | return -ENOMEM; | |
8a0dc95f EVH |
1614 | } |
1615 | ||
a80d923e EVH |
1616 | v9fs_register_trans(&p9_tcp_trans); |
1617 | v9fs_register_trans(&p9_unix_trans); | |
1618 | v9fs_register_trans(&p9_fd_trans); | |
1619 | ||
3387b804 | 1620 | return 0; |
a80d923e | 1621 | } |
72029fe8 TH |
1622 | |
1623 | void p9_trans_fd_exit(void) | |
1624 | { | |
1625 | v9fs_unregister_trans(&p9_tcp_trans); | |
1626 | v9fs_unregister_trans(&p9_unix_trans); | |
1627 | v9fs_unregister_trans(&p9_fd_trans); | |
206ca50d TH |
1628 | |
1629 | destroy_workqueue(p9_mux_wq); | |
72029fe8 | 1630 | } |