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1 | /* | |
2 | * net/9p/clnt.c | |
3 | * | |
4 | * 9P Client | |
5 | * | |
6 | * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> | |
7 | * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 | |
11 | * as published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to: | |
20 | * Free Software Foundation | |
21 | * 51 Franklin Street, Fifth Floor | |
22 | * Boston, MA 02111-1301 USA | |
23 | * | |
24 | */ | |
25 | ||
26 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
27 | ||
28 | #include <linux/module.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/fs.h> | |
31 | #include <linux/poll.h> | |
32 | #include <linux/idr.h> | |
33 | #include <linux/mutex.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/sched.h> | |
36 | #include <linux/uaccess.h> | |
37 | #include <net/9p/9p.h> | |
38 | #include <linux/parser.h> | |
39 | #include <net/9p/client.h> | |
40 | #include <net/9p/transport.h> | |
41 | #include "protocol.h" | |
42 | ||
43 | #define CREATE_TRACE_POINTS | |
44 | #include <trace/events/9p.h> | |
45 | ||
46 | /* | |
47 | * Client Option Parsing (code inspired by NFS code) | |
48 | * - a little lazy - parse all client options | |
49 | */ | |
50 | ||
51 | enum { | |
52 | Opt_msize, | |
53 | Opt_trans, | |
54 | Opt_legacy, | |
55 | Opt_version, | |
56 | Opt_err, | |
57 | }; | |
58 | ||
59 | static const match_table_t tokens = { | |
60 | {Opt_msize, "msize=%u"}, | |
61 | {Opt_legacy, "noextend"}, | |
62 | {Opt_trans, "trans=%s"}, | |
63 | {Opt_version, "version=%s"}, | |
64 | {Opt_err, NULL}, | |
65 | }; | |
66 | ||
67 | inline int p9_is_proto_dotl(struct p9_client *clnt) | |
68 | { | |
69 | return clnt->proto_version == p9_proto_2000L; | |
70 | } | |
71 | EXPORT_SYMBOL(p9_is_proto_dotl); | |
72 | ||
73 | inline int p9_is_proto_dotu(struct p9_client *clnt) | |
74 | { | |
75 | return clnt->proto_version == p9_proto_2000u; | |
76 | } | |
77 | EXPORT_SYMBOL(p9_is_proto_dotu); | |
78 | ||
79 | /* Interpret mount option for protocol version */ | |
80 | static int get_protocol_version(char *s) | |
81 | { | |
82 | int version = -EINVAL; | |
83 | ||
84 | if (!strcmp(s, "9p2000")) { | |
85 | version = p9_proto_legacy; | |
86 | p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); | |
87 | } else if (!strcmp(s, "9p2000.u")) { | |
88 | version = p9_proto_2000u; | |
89 | p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); | |
90 | } else if (!strcmp(s, "9p2000.L")) { | |
91 | version = p9_proto_2000L; | |
92 | p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); | |
93 | } else | |
94 | pr_info("Unknown protocol version %s\n", s); | |
95 | ||
96 | return version; | |
97 | } | |
98 | ||
99 | /** | |
100 | * parse_options - parse mount options into client structure | |
101 | * @opts: options string passed from mount | |
102 | * @clnt: existing v9fs client information | |
103 | * | |
104 | * Return 0 upon success, -ERRNO upon failure | |
105 | */ | |
106 | ||
107 | static int parse_opts(char *opts, struct p9_client *clnt) | |
108 | { | |
109 | char *options, *tmp_options; | |
110 | char *p; | |
111 | substring_t args[MAX_OPT_ARGS]; | |
112 | int option; | |
113 | char *s; | |
114 | int ret = 0; | |
115 | ||
116 | clnt->proto_version = p9_proto_2000u; | |
117 | clnt->msize = 8192; | |
118 | ||
119 | if (!opts) | |
120 | return 0; | |
121 | ||
122 | tmp_options = kstrdup(opts, GFP_KERNEL); | |
123 | if (!tmp_options) { | |
124 | p9_debug(P9_DEBUG_ERROR, | |
125 | "failed to allocate copy of option string\n"); | |
126 | return -ENOMEM; | |
127 | } | |
128 | options = tmp_options; | |
129 | ||
130 | while ((p = strsep(&options, ",")) != NULL) { | |
131 | int token, r; | |
132 | if (!*p) | |
133 | continue; | |
134 | token = match_token(p, tokens, args); | |
135 | switch (token) { | |
136 | case Opt_msize: | |
137 | r = match_int(&args[0], &option); | |
138 | if (r < 0) { | |
139 | p9_debug(P9_DEBUG_ERROR, | |
140 | "integer field, but no integer?\n"); | |
141 | ret = r; | |
142 | continue; | |
143 | } | |
144 | clnt->msize = option; | |
145 | break; | |
146 | case Opt_trans: | |
147 | s = match_strdup(&args[0]); | |
148 | if (!s) { | |
149 | ret = -ENOMEM; | |
150 | p9_debug(P9_DEBUG_ERROR, | |
151 | "problem allocating copy of trans arg\n"); | |
152 | goto free_and_return; | |
153 | } | |
154 | clnt->trans_mod = v9fs_get_trans_by_name(s); | |
155 | if (clnt->trans_mod == NULL) { | |
156 | pr_info("Could not find request transport: %s\n", | |
157 | s); | |
158 | ret = -EINVAL; | |
159 | kfree(s); | |
160 | goto free_and_return; | |
161 | } | |
162 | kfree(s); | |
163 | break; | |
164 | case Opt_legacy: | |
165 | clnt->proto_version = p9_proto_legacy; | |
166 | break; | |
167 | case Opt_version: | |
168 | s = match_strdup(&args[0]); | |
169 | if (!s) { | |
170 | ret = -ENOMEM; | |
171 | p9_debug(P9_DEBUG_ERROR, | |
172 | "problem allocating copy of version arg\n"); | |
173 | goto free_and_return; | |
174 | } | |
175 | ret = get_protocol_version(s); | |
176 | if (ret == -EINVAL) { | |
177 | kfree(s); | |
178 | goto free_and_return; | |
179 | } | |
180 | kfree(s); | |
181 | clnt->proto_version = ret; | |
182 | break; | |
183 | default: | |
184 | continue; | |
185 | } | |
186 | } | |
187 | ||
188 | free_and_return: | |
189 | kfree(tmp_options); | |
190 | return ret; | |
191 | } | |
192 | ||
193 | /** | |
194 | * p9_tag_alloc - lookup/allocate a request by tag | |
195 | * @c: client session to lookup tag within | |
196 | * @tag: numeric id for transaction | |
197 | * | |
198 | * this is a simple array lookup, but will grow the | |
199 | * request_slots as necessary to accommodate transaction | |
200 | * ids which did not previously have a slot. | |
201 | * | |
202 | * this code relies on the client spinlock to manage locks, its | |
203 | * possible we should switch to something else, but I'd rather | |
204 | * stick with something low-overhead for the common case. | |
205 | * | |
206 | */ | |
207 | ||
208 | static struct p9_req_t * | |
209 | p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size) | |
210 | { | |
211 | unsigned long flags; | |
212 | int row, col; | |
213 | struct p9_req_t *req; | |
214 | int alloc_msize = min(c->msize, max_size); | |
215 | ||
216 | /* This looks up the original request by tag so we know which | |
217 | * buffer to read the data into */ | |
218 | tag++; | |
219 | ||
220 | if (tag >= c->max_tag) { | |
221 | spin_lock_irqsave(&c->lock, flags); | |
222 | /* check again since original check was outside of lock */ | |
223 | while (tag >= c->max_tag) { | |
224 | row = (tag / P9_ROW_MAXTAG); | |
225 | c->reqs[row] = kcalloc(P9_ROW_MAXTAG, | |
226 | sizeof(struct p9_req_t), GFP_ATOMIC); | |
227 | ||
228 | if (!c->reqs[row]) { | |
229 | pr_err("Couldn't grow tag array\n"); | |
230 | spin_unlock_irqrestore(&c->lock, flags); | |
231 | return ERR_PTR(-ENOMEM); | |
232 | } | |
233 | for (col = 0; col < P9_ROW_MAXTAG; col++) { | |
234 | c->reqs[row][col].status = REQ_STATUS_IDLE; | |
235 | c->reqs[row][col].tc = NULL; | |
236 | } | |
237 | c->max_tag += P9_ROW_MAXTAG; | |
238 | } | |
239 | spin_unlock_irqrestore(&c->lock, flags); | |
240 | } | |
241 | row = tag / P9_ROW_MAXTAG; | |
242 | col = tag % P9_ROW_MAXTAG; | |
243 | ||
244 | req = &c->reqs[row][col]; | |
245 | if (!req->tc) { | |
246 | req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS); | |
247 | if (!req->wq) { | |
248 | pr_err("Couldn't grow tag array\n"); | |
249 | return ERR_PTR(-ENOMEM); | |
250 | } | |
251 | init_waitqueue_head(req->wq); | |
252 | req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, | |
253 | GFP_NOFS); | |
254 | req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, | |
255 | GFP_NOFS); | |
256 | if ((!req->tc) || (!req->rc)) { | |
257 | pr_err("Couldn't grow tag array\n"); | |
258 | kfree(req->tc); | |
259 | kfree(req->rc); | |
260 | kfree(req->wq); | |
261 | req->tc = req->rc = NULL; | |
262 | req->wq = NULL; | |
263 | return ERR_PTR(-ENOMEM); | |
264 | } | |
265 | req->tc->capacity = alloc_msize; | |
266 | req->rc->capacity = alloc_msize; | |
267 | req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall); | |
268 | req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall); | |
269 | } | |
270 | ||
271 | p9pdu_reset(req->tc); | |
272 | p9pdu_reset(req->rc); | |
273 | ||
274 | req->tc->tag = tag-1; | |
275 | req->status = REQ_STATUS_ALLOC; | |
276 | ||
277 | return &c->reqs[row][col]; | |
278 | } | |
279 | ||
280 | /** | |
281 | * p9_tag_lookup - lookup a request by tag | |
282 | * @c: client session to lookup tag within | |
283 | * @tag: numeric id for transaction | |
284 | * | |
285 | */ | |
286 | ||
287 | struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) | |
288 | { | |
289 | int row, col; | |
290 | ||
291 | /* This looks up the original request by tag so we know which | |
292 | * buffer to read the data into */ | |
293 | tag++; | |
294 | ||
295 | if(tag >= c->max_tag) | |
296 | return NULL; | |
297 | ||
298 | row = tag / P9_ROW_MAXTAG; | |
299 | col = tag % P9_ROW_MAXTAG; | |
300 | ||
301 | return &c->reqs[row][col]; | |
302 | } | |
303 | EXPORT_SYMBOL(p9_tag_lookup); | |
304 | ||
305 | /** | |
306 | * p9_tag_init - setup tags structure and contents | |
307 | * @c: v9fs client struct | |
308 | * | |
309 | * This initializes the tags structure for each client instance. | |
310 | * | |
311 | */ | |
312 | ||
313 | static int p9_tag_init(struct p9_client *c) | |
314 | { | |
315 | int err = 0; | |
316 | ||
317 | c->tagpool = p9_idpool_create(); | |
318 | if (IS_ERR(c->tagpool)) { | |
319 | err = PTR_ERR(c->tagpool); | |
320 | goto error; | |
321 | } | |
322 | err = p9_idpool_get(c->tagpool); /* reserve tag 0 */ | |
323 | if (err < 0) { | |
324 | p9_idpool_destroy(c->tagpool); | |
325 | goto error; | |
326 | } | |
327 | c->max_tag = 0; | |
328 | error: | |
329 | return err; | |
330 | } | |
331 | ||
332 | /** | |
333 | * p9_tag_cleanup - cleans up tags structure and reclaims resources | |
334 | * @c: v9fs client struct | |
335 | * | |
336 | * This frees resources associated with the tags structure | |
337 | * | |
338 | */ | |
339 | static void p9_tag_cleanup(struct p9_client *c) | |
340 | { | |
341 | int row, col; | |
342 | ||
343 | /* check to insure all requests are idle */ | |
344 | for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { | |
345 | for (col = 0; col < P9_ROW_MAXTAG; col++) { | |
346 | if (c->reqs[row][col].status != REQ_STATUS_IDLE) { | |
347 | p9_debug(P9_DEBUG_MUX, | |
348 | "Attempting to cleanup non-free tag %d,%d\n", | |
349 | row, col); | |
350 | /* TODO: delay execution of cleanup */ | |
351 | return; | |
352 | } | |
353 | } | |
354 | } | |
355 | ||
356 | if (c->tagpool) { | |
357 | p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */ | |
358 | p9_idpool_destroy(c->tagpool); | |
359 | } | |
360 | ||
361 | /* free requests associated with tags */ | |
362 | for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { | |
363 | for (col = 0; col < P9_ROW_MAXTAG; col++) { | |
364 | kfree(c->reqs[row][col].wq); | |
365 | kfree(c->reqs[row][col].tc); | |
366 | kfree(c->reqs[row][col].rc); | |
367 | } | |
368 | kfree(c->reqs[row]); | |
369 | } | |
370 | c->max_tag = 0; | |
371 | } | |
372 | ||
373 | /** | |
374 | * p9_free_req - free a request and clean-up as necessary | |
375 | * c: client state | |
376 | * r: request to release | |
377 | * | |
378 | */ | |
379 | ||
380 | static void p9_free_req(struct p9_client *c, struct p9_req_t *r) | |
381 | { | |
382 | int tag = r->tc->tag; | |
383 | p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); | |
384 | ||
385 | r->status = REQ_STATUS_IDLE; | |
386 | if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) | |
387 | p9_idpool_put(tag, c->tagpool); | |
388 | } | |
389 | ||
390 | /** | |
391 | * p9_client_cb - call back from transport to client | |
392 | * c: client state | |
393 | * req: request received | |
394 | * | |
395 | */ | |
396 | void p9_client_cb(struct p9_client *c, struct p9_req_t *req) | |
397 | { | |
398 | p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); | |
399 | wake_up(req->wq); | |
400 | p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); | |
401 | } | |
402 | EXPORT_SYMBOL(p9_client_cb); | |
403 | ||
404 | /** | |
405 | * p9_parse_header - parse header arguments out of a packet | |
406 | * @pdu: packet to parse | |
407 | * @size: size of packet | |
408 | * @type: type of request | |
409 | * @tag: tag of packet | |
410 | * @rewind: set if we need to rewind offset afterwards | |
411 | */ | |
412 | ||
413 | int | |
414 | p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, | |
415 | int rewind) | |
416 | { | |
417 | int8_t r_type; | |
418 | int16_t r_tag; | |
419 | int32_t r_size; | |
420 | int offset = pdu->offset; | |
421 | int err; | |
422 | ||
423 | pdu->offset = 0; | |
424 | if (pdu->size == 0) | |
425 | pdu->size = 7; | |
426 | ||
427 | err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); | |
428 | if (err) | |
429 | goto rewind_and_exit; | |
430 | ||
431 | pdu->size = r_size; | |
432 | pdu->id = r_type; | |
433 | pdu->tag = r_tag; | |
434 | ||
435 | p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", | |
436 | pdu->size, pdu->id, pdu->tag); | |
437 | ||
438 | if (type) | |
439 | *type = r_type; | |
440 | if (tag) | |
441 | *tag = r_tag; | |
442 | if (size) | |
443 | *size = r_size; | |
444 | ||
445 | ||
446 | rewind_and_exit: | |
447 | if (rewind) | |
448 | pdu->offset = offset; | |
449 | return err; | |
450 | } | |
451 | EXPORT_SYMBOL(p9_parse_header); | |
452 | ||
453 | /** | |
454 | * p9_check_errors - check 9p packet for error return and process it | |
455 | * @c: current client instance | |
456 | * @req: request to parse and check for error conditions | |
457 | * | |
458 | * returns error code if one is discovered, otherwise returns 0 | |
459 | * | |
460 | * this will have to be more complicated if we have multiple | |
461 | * error packet types | |
462 | */ | |
463 | ||
464 | static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) | |
465 | { | |
466 | int8_t type; | |
467 | int err; | |
468 | int ecode; | |
469 | ||
470 | err = p9_parse_header(req->rc, NULL, &type, NULL, 0); | |
471 | /* | |
472 | * dump the response from server | |
473 | * This should be after check errors which poplulate pdu_fcall. | |
474 | */ | |
475 | trace_9p_protocol_dump(c, req->rc); | |
476 | if (err) { | |
477 | p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); | |
478 | return err; | |
479 | } | |
480 | if (type != P9_RERROR && type != P9_RLERROR) | |
481 | return 0; | |
482 | ||
483 | if (!p9_is_proto_dotl(c)) { | |
484 | char *ename; | |
485 | err = p9pdu_readf(req->rc, c->proto_version, "s?d", | |
486 | &ename, &ecode); | |
487 | if (err) | |
488 | goto out_err; | |
489 | ||
490 | if (p9_is_proto_dotu(c)) | |
491 | err = -ecode; | |
492 | ||
493 | if (!err || !IS_ERR_VALUE(err)) { | |
494 | err = p9_errstr2errno(ename, strlen(ename)); | |
495 | ||
496 | p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", | |
497 | -ecode, ename); | |
498 | } | |
499 | kfree(ename); | |
500 | } else { | |
501 | err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); | |
502 | err = -ecode; | |
503 | ||
504 | p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); | |
505 | } | |
506 | ||
507 | return err; | |
508 | ||
509 | out_err: | |
510 | p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); | |
511 | ||
512 | return err; | |
513 | } | |
514 | ||
515 | /** | |
516 | * p9_check_zc_errors - check 9p packet for error return and process it | |
517 | * @c: current client instance | |
518 | * @req: request to parse and check for error conditions | |
519 | * @in_hdrlen: Size of response protocol buffer. | |
520 | * | |
521 | * returns error code if one is discovered, otherwise returns 0 | |
522 | * | |
523 | * this will have to be more complicated if we have multiple | |
524 | * error packet types | |
525 | */ | |
526 | ||
527 | static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, | |
528 | char *uidata, int in_hdrlen, int kern_buf) | |
529 | { | |
530 | int err; | |
531 | int ecode; | |
532 | int8_t type; | |
533 | char *ename = NULL; | |
534 | ||
535 | err = p9_parse_header(req->rc, NULL, &type, NULL, 0); | |
536 | /* | |
537 | * dump the response from server | |
538 | * This should be after parse_header which poplulate pdu_fcall. | |
539 | */ | |
540 | trace_9p_protocol_dump(c, req->rc); | |
541 | if (err) { | |
542 | p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); | |
543 | return err; | |
544 | } | |
545 | ||
546 | if (type != P9_RERROR && type != P9_RLERROR) | |
547 | return 0; | |
548 | ||
549 | if (!p9_is_proto_dotl(c)) { | |
550 | /* Error is reported in string format */ | |
551 | uint16_t len; | |
552 | /* 7 = header size for RERROR, 2 is the size of string len; */ | |
553 | int inline_len = in_hdrlen - (7 + 2); | |
554 | ||
555 | /* Read the size of error string */ | |
556 | err = p9pdu_readf(req->rc, c->proto_version, "w", &len); | |
557 | if (err) | |
558 | goto out_err; | |
559 | ||
560 | ename = kmalloc(len + 1, GFP_NOFS); | |
561 | if (!ename) { | |
562 | err = -ENOMEM; | |
563 | goto out_err; | |
564 | } | |
565 | if (len <= inline_len) { | |
566 | /* We have error in protocol buffer itself */ | |
567 | if (pdu_read(req->rc, ename, len)) { | |
568 | err = -EFAULT; | |
569 | goto out_free; | |
570 | ||
571 | } | |
572 | } else { | |
573 | /* | |
574 | * Part of the data is in user space buffer. | |
575 | */ | |
576 | if (pdu_read(req->rc, ename, inline_len)) { | |
577 | err = -EFAULT; | |
578 | goto out_free; | |
579 | ||
580 | } | |
581 | if (kern_buf) { | |
582 | memcpy(ename + inline_len, uidata, | |
583 | len - inline_len); | |
584 | } else { | |
585 | err = copy_from_user(ename + inline_len, | |
586 | uidata, len - inline_len); | |
587 | if (err) { | |
588 | err = -EFAULT; | |
589 | goto out_free; | |
590 | } | |
591 | } | |
592 | } | |
593 | ename[len] = 0; | |
594 | if (p9_is_proto_dotu(c)) { | |
595 | /* For dotu we also have error code */ | |
596 | err = p9pdu_readf(req->rc, | |
597 | c->proto_version, "d", &ecode); | |
598 | if (err) | |
599 | goto out_free; | |
600 | err = -ecode; | |
601 | } | |
602 | if (!err || !IS_ERR_VALUE(err)) { | |
603 | err = p9_errstr2errno(ename, strlen(ename)); | |
604 | ||
605 | p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", | |
606 | -ecode, ename); | |
607 | } | |
608 | kfree(ename); | |
609 | } else { | |
610 | err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); | |
611 | err = -ecode; | |
612 | ||
613 | p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); | |
614 | } | |
615 | return err; | |
616 | ||
617 | out_free: | |
618 | kfree(ename); | |
619 | out_err: | |
620 | p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); | |
621 | return err; | |
622 | } | |
623 | ||
624 | static struct p9_req_t * | |
625 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); | |
626 | ||
627 | /** | |
628 | * p9_client_flush - flush (cancel) a request | |
629 | * @c: client state | |
630 | * @oldreq: request to cancel | |
631 | * | |
632 | * This sents a flush for a particular request and links | |
633 | * the flush request to the original request. The current | |
634 | * code only supports a single flush request although the protocol | |
635 | * allows for multiple flush requests to be sent for a single request. | |
636 | * | |
637 | */ | |
638 | ||
639 | static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) | |
640 | { | |
641 | struct p9_req_t *req; | |
642 | int16_t oldtag; | |
643 | int err; | |
644 | ||
645 | err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); | |
646 | if (err) | |
647 | return err; | |
648 | ||
649 | p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); | |
650 | ||
651 | req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); | |
652 | if (IS_ERR(req)) | |
653 | return PTR_ERR(req); | |
654 | ||
655 | ||
656 | /* if we haven't received a response for oldreq, | |
657 | remove it from the list. */ | |
658 | spin_lock(&c->lock); | |
659 | if (oldreq->status == REQ_STATUS_FLSH) | |
660 | list_del(&oldreq->req_list); | |
661 | spin_unlock(&c->lock); | |
662 | ||
663 | p9_free_req(c, req); | |
664 | return 0; | |
665 | } | |
666 | ||
667 | static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, | |
668 | int8_t type, int req_size, | |
669 | const char *fmt, va_list ap) | |
670 | { | |
671 | int tag, err; | |
672 | struct p9_req_t *req; | |
673 | ||
674 | p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); | |
675 | ||
676 | /* we allow for any status other than disconnected */ | |
677 | if (c->status == Disconnected) | |
678 | return ERR_PTR(-EIO); | |
679 | ||
680 | /* if status is begin_disconnected we allow only clunk request */ | |
681 | if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) | |
682 | return ERR_PTR(-EIO); | |
683 | ||
684 | tag = P9_NOTAG; | |
685 | if (type != P9_TVERSION) { | |
686 | tag = p9_idpool_get(c->tagpool); | |
687 | if (tag < 0) | |
688 | return ERR_PTR(-ENOMEM); | |
689 | } | |
690 | ||
691 | req = p9_tag_alloc(c, tag, req_size); | |
692 | if (IS_ERR(req)) | |
693 | return req; | |
694 | ||
695 | /* marshall the data */ | |
696 | p9pdu_prepare(req->tc, tag, type); | |
697 | err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); | |
698 | if (err) | |
699 | goto reterr; | |
700 | p9pdu_finalize(c, req->tc); | |
701 | trace_9p_client_req(c, type, tag); | |
702 | return req; | |
703 | reterr: | |
704 | p9_free_req(c, req); | |
705 | return ERR_PTR(err); | |
706 | } | |
707 | ||
708 | /** | |
709 | * p9_client_rpc - issue a request and wait for a response | |
710 | * @c: client session | |
711 | * @type: type of request | |
712 | * @fmt: protocol format string (see protocol.c) | |
713 | * | |
714 | * Returns request structure (which client must free using p9_free_req) | |
715 | */ | |
716 | ||
717 | static struct p9_req_t * | |
718 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) | |
719 | { | |
720 | va_list ap; | |
721 | int sigpending, err; | |
722 | unsigned long flags; | |
723 | struct p9_req_t *req; | |
724 | ||
725 | va_start(ap, fmt); | |
726 | req = p9_client_prepare_req(c, type, c->msize, fmt, ap); | |
727 | va_end(ap); | |
728 | if (IS_ERR(req)) | |
729 | return req; | |
730 | ||
731 | if (signal_pending(current)) { | |
732 | sigpending = 1; | |
733 | clear_thread_flag(TIF_SIGPENDING); | |
734 | } else | |
735 | sigpending = 0; | |
736 | ||
737 | err = c->trans_mod->request(c, req); | |
738 | if (err < 0) { | |
739 | if (err != -ERESTARTSYS && err != -EFAULT) | |
740 | c->status = Disconnected; | |
741 | goto reterr; | |
742 | } | |
743 | again: | |
744 | /* Wait for the response */ | |
745 | err = wait_event_interruptible(*req->wq, | |
746 | req->status >= REQ_STATUS_RCVD); | |
747 | ||
748 | if ((err == -ERESTARTSYS) && (c->status == Connected) | |
749 | && (type == P9_TFLUSH)) { | |
750 | sigpending = 1; | |
751 | clear_thread_flag(TIF_SIGPENDING); | |
752 | goto again; | |
753 | } | |
754 | ||
755 | if (req->status == REQ_STATUS_ERROR) { | |
756 | p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); | |
757 | err = req->t_err; | |
758 | } | |
759 | if ((err == -ERESTARTSYS) && (c->status == Connected)) { | |
760 | p9_debug(P9_DEBUG_MUX, "flushing\n"); | |
761 | sigpending = 1; | |
762 | clear_thread_flag(TIF_SIGPENDING); | |
763 | ||
764 | if (c->trans_mod->cancel(c, req)) | |
765 | p9_client_flush(c, req); | |
766 | ||
767 | /* if we received the response anyway, don't signal error */ | |
768 | if (req->status == REQ_STATUS_RCVD) | |
769 | err = 0; | |
770 | } | |
771 | if (sigpending) { | |
772 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
773 | recalc_sigpending(); | |
774 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
775 | } | |
776 | if (err < 0) | |
777 | goto reterr; | |
778 | ||
779 | err = p9_check_errors(c, req); | |
780 | trace_9p_client_res(c, type, req->rc->tag, err); | |
781 | if (!err) | |
782 | return req; | |
783 | reterr: | |
784 | p9_free_req(c, req); | |
785 | return ERR_PTR(err); | |
786 | } | |
787 | ||
788 | /** | |
789 | * p9_client_zc_rpc - issue a request and wait for a response | |
790 | * @c: client session | |
791 | * @type: type of request | |
792 | * @uidata: user bffer that should be ued for zero copy read | |
793 | * @uodata: user buffer that shoud be user for zero copy write | |
794 | * @inlen: read buffer size | |
795 | * @olen: write buffer size | |
796 | * @hdrlen: reader header size, This is the size of response protocol data | |
797 | * @fmt: protocol format string (see protocol.c) | |
798 | * | |
799 | * Returns request structure (which client must free using p9_free_req) | |
800 | */ | |
801 | static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, | |
802 | char *uidata, char *uodata, | |
803 | int inlen, int olen, int in_hdrlen, | |
804 | int kern_buf, const char *fmt, ...) | |
805 | { | |
806 | va_list ap; | |
807 | int sigpending, err; | |
808 | unsigned long flags; | |
809 | struct p9_req_t *req; | |
810 | ||
811 | va_start(ap, fmt); | |
812 | /* | |
813 | * We allocate a inline protocol data of only 4k bytes. | |
814 | * The actual content is passed in zero-copy fashion. | |
815 | */ | |
816 | req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); | |
817 | va_end(ap); | |
818 | if (IS_ERR(req)) | |
819 | return req; | |
820 | ||
821 | if (signal_pending(current)) { | |
822 | sigpending = 1; | |
823 | clear_thread_flag(TIF_SIGPENDING); | |
824 | } else | |
825 | sigpending = 0; | |
826 | ||
827 | /* If we are called with KERNEL_DS force kern_buf */ | |
828 | if (segment_eq(get_fs(), KERNEL_DS)) | |
829 | kern_buf = 1; | |
830 | ||
831 | err = c->trans_mod->zc_request(c, req, uidata, uodata, | |
832 | inlen, olen, in_hdrlen, kern_buf); | |
833 | if (err < 0) { | |
834 | if (err == -EIO) | |
835 | c->status = Disconnected; | |
836 | goto reterr; | |
837 | } | |
838 | if (req->status == REQ_STATUS_ERROR) { | |
839 | p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); | |
840 | err = req->t_err; | |
841 | } | |
842 | if ((err == -ERESTARTSYS) && (c->status == Connected)) { | |
843 | p9_debug(P9_DEBUG_MUX, "flushing\n"); | |
844 | sigpending = 1; | |
845 | clear_thread_flag(TIF_SIGPENDING); | |
846 | ||
847 | if (c->trans_mod->cancel(c, req)) | |
848 | p9_client_flush(c, req); | |
849 | ||
850 | /* if we received the response anyway, don't signal error */ | |
851 | if (req->status == REQ_STATUS_RCVD) | |
852 | err = 0; | |
853 | } | |
854 | if (sigpending) { | |
855 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
856 | recalc_sigpending(); | |
857 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
858 | } | |
859 | if (err < 0) | |
860 | goto reterr; | |
861 | ||
862 | err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf); | |
863 | trace_9p_client_res(c, type, req->rc->tag, err); | |
864 | if (!err) | |
865 | return req; | |
866 | reterr: | |
867 | p9_free_req(c, req); | |
868 | return ERR_PTR(err); | |
869 | } | |
870 | ||
871 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) | |
872 | { | |
873 | int ret; | |
874 | struct p9_fid *fid; | |
875 | unsigned long flags; | |
876 | ||
877 | p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); | |
878 | fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); | |
879 | if (!fid) | |
880 | return ERR_PTR(-ENOMEM); | |
881 | ||
882 | ret = p9_idpool_get(clnt->fidpool); | |
883 | if (ret < 0) { | |
884 | ret = -ENOSPC; | |
885 | goto error; | |
886 | } | |
887 | fid->fid = ret; | |
888 | ||
889 | memset(&fid->qid, 0, sizeof(struct p9_qid)); | |
890 | fid->mode = -1; | |
891 | fid->uid = current_fsuid(); | |
892 | fid->clnt = clnt; | |
893 | fid->rdir = NULL; | |
894 | spin_lock_irqsave(&clnt->lock, flags); | |
895 | list_add(&fid->flist, &clnt->fidlist); | |
896 | spin_unlock_irqrestore(&clnt->lock, flags); | |
897 | ||
898 | return fid; | |
899 | ||
900 | error: | |
901 | kfree(fid); | |
902 | return ERR_PTR(ret); | |
903 | } | |
904 | ||
905 | static void p9_fid_destroy(struct p9_fid *fid) | |
906 | { | |
907 | struct p9_client *clnt; | |
908 | unsigned long flags; | |
909 | ||
910 | p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); | |
911 | clnt = fid->clnt; | |
912 | p9_idpool_put(fid->fid, clnt->fidpool); | |
913 | spin_lock_irqsave(&clnt->lock, flags); | |
914 | list_del(&fid->flist); | |
915 | spin_unlock_irqrestore(&clnt->lock, flags); | |
916 | kfree(fid->rdir); | |
917 | kfree(fid); | |
918 | } | |
919 | ||
920 | static int p9_client_version(struct p9_client *c) | |
921 | { | |
922 | int err = 0; | |
923 | struct p9_req_t *req; | |
924 | char *version; | |
925 | int msize; | |
926 | ||
927 | p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", | |
928 | c->msize, c->proto_version); | |
929 | ||
930 | switch (c->proto_version) { | |
931 | case p9_proto_2000L: | |
932 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
933 | c->msize, "9P2000.L"); | |
934 | break; | |
935 | case p9_proto_2000u: | |
936 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
937 | c->msize, "9P2000.u"); | |
938 | break; | |
939 | case p9_proto_legacy: | |
940 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
941 | c->msize, "9P2000"); | |
942 | break; | |
943 | default: | |
944 | return -EINVAL; | |
945 | break; | |
946 | } | |
947 | ||
948 | if (IS_ERR(req)) | |
949 | return PTR_ERR(req); | |
950 | ||
951 | err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); | |
952 | if (err) { | |
953 | p9_debug(P9_DEBUG_9P, "version error %d\n", err); | |
954 | trace_9p_protocol_dump(c, req->rc); | |
955 | goto error; | |
956 | } | |
957 | ||
958 | p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); | |
959 | if (!strncmp(version, "9P2000.L", 8)) | |
960 | c->proto_version = p9_proto_2000L; | |
961 | else if (!strncmp(version, "9P2000.u", 8)) | |
962 | c->proto_version = p9_proto_2000u; | |
963 | else if (!strncmp(version, "9P2000", 6)) | |
964 | c->proto_version = p9_proto_legacy; | |
965 | else { | |
966 | err = -EREMOTEIO; | |
967 | goto error; | |
968 | } | |
969 | ||
970 | if (msize < c->msize) | |
971 | c->msize = msize; | |
972 | ||
973 | error: | |
974 | kfree(version); | |
975 | p9_free_req(c, req); | |
976 | ||
977 | return err; | |
978 | } | |
979 | ||
980 | struct p9_client *p9_client_create(const char *dev_name, char *options) | |
981 | { | |
982 | int err; | |
983 | struct p9_client *clnt; | |
984 | ||
985 | err = 0; | |
986 | clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); | |
987 | if (!clnt) | |
988 | return ERR_PTR(-ENOMEM); | |
989 | ||
990 | clnt->trans_mod = NULL; | |
991 | clnt->trans = NULL; | |
992 | spin_lock_init(&clnt->lock); | |
993 | INIT_LIST_HEAD(&clnt->fidlist); | |
994 | ||
995 | err = p9_tag_init(clnt); | |
996 | if (err < 0) | |
997 | goto free_client; | |
998 | ||
999 | err = parse_opts(options, clnt); | |
1000 | if (err < 0) | |
1001 | goto destroy_tagpool; | |
1002 | ||
1003 | if (!clnt->trans_mod) | |
1004 | clnt->trans_mod = v9fs_get_default_trans(); | |
1005 | ||
1006 | if (clnt->trans_mod == NULL) { | |
1007 | err = -EPROTONOSUPPORT; | |
1008 | p9_debug(P9_DEBUG_ERROR, | |
1009 | "No transport defined or default transport\n"); | |
1010 | goto destroy_tagpool; | |
1011 | } | |
1012 | ||
1013 | clnt->fidpool = p9_idpool_create(); | |
1014 | if (IS_ERR(clnt->fidpool)) { | |
1015 | err = PTR_ERR(clnt->fidpool); | |
1016 | goto put_trans; | |
1017 | } | |
1018 | ||
1019 | p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", | |
1020 | clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); | |
1021 | ||
1022 | err = clnt->trans_mod->create(clnt, dev_name, options); | |
1023 | if (err) | |
1024 | goto destroy_fidpool; | |
1025 | ||
1026 | if (clnt->msize > clnt->trans_mod->maxsize) | |
1027 | clnt->msize = clnt->trans_mod->maxsize; | |
1028 | ||
1029 | err = p9_client_version(clnt); | |
1030 | if (err) | |
1031 | goto close_trans; | |
1032 | ||
1033 | return clnt; | |
1034 | ||
1035 | close_trans: | |
1036 | clnt->trans_mod->close(clnt); | |
1037 | destroy_fidpool: | |
1038 | p9_idpool_destroy(clnt->fidpool); | |
1039 | put_trans: | |
1040 | v9fs_put_trans(clnt->trans_mod); | |
1041 | destroy_tagpool: | |
1042 | p9_idpool_destroy(clnt->tagpool); | |
1043 | free_client: | |
1044 | kfree(clnt); | |
1045 | return ERR_PTR(err); | |
1046 | } | |
1047 | EXPORT_SYMBOL(p9_client_create); | |
1048 | ||
1049 | void p9_client_destroy(struct p9_client *clnt) | |
1050 | { | |
1051 | struct p9_fid *fid, *fidptr; | |
1052 | ||
1053 | p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); | |
1054 | ||
1055 | if (clnt->trans_mod) | |
1056 | clnt->trans_mod->close(clnt); | |
1057 | ||
1058 | v9fs_put_trans(clnt->trans_mod); | |
1059 | ||
1060 | list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { | |
1061 | pr_info("Found fid %d not clunked\n", fid->fid); | |
1062 | p9_fid_destroy(fid); | |
1063 | } | |
1064 | ||
1065 | if (clnt->fidpool) | |
1066 | p9_idpool_destroy(clnt->fidpool); | |
1067 | ||
1068 | p9_tag_cleanup(clnt); | |
1069 | ||
1070 | kfree(clnt); | |
1071 | } | |
1072 | EXPORT_SYMBOL(p9_client_destroy); | |
1073 | ||
1074 | void p9_client_disconnect(struct p9_client *clnt) | |
1075 | { | |
1076 | p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); | |
1077 | clnt->status = Disconnected; | |
1078 | } | |
1079 | EXPORT_SYMBOL(p9_client_disconnect); | |
1080 | ||
1081 | void p9_client_begin_disconnect(struct p9_client *clnt) | |
1082 | { | |
1083 | p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); | |
1084 | clnt->status = BeginDisconnect; | |
1085 | } | |
1086 | EXPORT_SYMBOL(p9_client_begin_disconnect); | |
1087 | ||
1088 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, | |
1089 | char *uname, u32 n_uname, char *aname) | |
1090 | { | |
1091 | int err = 0; | |
1092 | struct p9_req_t *req; | |
1093 | struct p9_fid *fid; | |
1094 | struct p9_qid qid; | |
1095 | ||
1096 | ||
1097 | p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", | |
1098 | afid ? afid->fid : -1, uname, aname); | |
1099 | fid = p9_fid_create(clnt); | |
1100 | if (IS_ERR(fid)) { | |
1101 | err = PTR_ERR(fid); | |
1102 | fid = NULL; | |
1103 | goto error; | |
1104 | } | |
1105 | ||
1106 | req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, | |
1107 | afid ? afid->fid : P9_NOFID, uname, aname, n_uname); | |
1108 | if (IS_ERR(req)) { | |
1109 | err = PTR_ERR(req); | |
1110 | goto error; | |
1111 | } | |
1112 | ||
1113 | err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); | |
1114 | if (err) { | |
1115 | trace_9p_protocol_dump(clnt, req->rc); | |
1116 | p9_free_req(clnt, req); | |
1117 | goto error; | |
1118 | } | |
1119 | ||
1120 | p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", | |
1121 | qid.type, (unsigned long long)qid.path, qid.version); | |
1122 | ||
1123 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); | |
1124 | ||
1125 | p9_free_req(clnt, req); | |
1126 | return fid; | |
1127 | ||
1128 | error: | |
1129 | if (fid) | |
1130 | p9_fid_destroy(fid); | |
1131 | return ERR_PTR(err); | |
1132 | } | |
1133 | EXPORT_SYMBOL(p9_client_attach); | |
1134 | ||
1135 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, | |
1136 | char **wnames, int clone) | |
1137 | { | |
1138 | int err; | |
1139 | struct p9_client *clnt; | |
1140 | struct p9_fid *fid; | |
1141 | struct p9_qid *wqids; | |
1142 | struct p9_req_t *req; | |
1143 | uint16_t nwqids, count; | |
1144 | ||
1145 | err = 0; | |
1146 | wqids = NULL; | |
1147 | clnt = oldfid->clnt; | |
1148 | if (clone) { | |
1149 | fid = p9_fid_create(clnt); | |
1150 | if (IS_ERR(fid)) { | |
1151 | err = PTR_ERR(fid); | |
1152 | fid = NULL; | |
1153 | goto error; | |
1154 | } | |
1155 | ||
1156 | fid->uid = oldfid->uid; | |
1157 | } else | |
1158 | fid = oldfid; | |
1159 | ||
1160 | ||
1161 | p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", | |
1162 | oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); | |
1163 | ||
1164 | req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, | |
1165 | nwname, wnames); | |
1166 | if (IS_ERR(req)) { | |
1167 | err = PTR_ERR(req); | |
1168 | goto error; | |
1169 | } | |
1170 | ||
1171 | err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); | |
1172 | if (err) { | |
1173 | trace_9p_protocol_dump(clnt, req->rc); | |
1174 | p9_free_req(clnt, req); | |
1175 | goto clunk_fid; | |
1176 | } | |
1177 | p9_free_req(clnt, req); | |
1178 | ||
1179 | p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); | |
1180 | ||
1181 | if (nwqids != nwname) { | |
1182 | err = -ENOENT; | |
1183 | goto clunk_fid; | |
1184 | } | |
1185 | ||
1186 | for (count = 0; count < nwqids; count++) | |
1187 | p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", | |
1188 | count, wqids[count].type, | |
1189 | (unsigned long long)wqids[count].path, | |
1190 | wqids[count].version); | |
1191 | ||
1192 | if (nwname) | |
1193 | memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); | |
1194 | else | |
1195 | fid->qid = oldfid->qid; | |
1196 | ||
1197 | kfree(wqids); | |
1198 | return fid; | |
1199 | ||
1200 | clunk_fid: | |
1201 | kfree(wqids); | |
1202 | p9_client_clunk(fid); | |
1203 | fid = NULL; | |
1204 | ||
1205 | error: | |
1206 | if (fid && (fid != oldfid)) | |
1207 | p9_fid_destroy(fid); | |
1208 | ||
1209 | return ERR_PTR(err); | |
1210 | } | |
1211 | EXPORT_SYMBOL(p9_client_walk); | |
1212 | ||
1213 | int p9_client_open(struct p9_fid *fid, int mode) | |
1214 | { | |
1215 | int err; | |
1216 | struct p9_client *clnt; | |
1217 | struct p9_req_t *req; | |
1218 | struct p9_qid qid; | |
1219 | int iounit; | |
1220 | ||
1221 | clnt = fid->clnt; | |
1222 | p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", | |
1223 | p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); | |
1224 | err = 0; | |
1225 | ||
1226 | if (fid->mode != -1) | |
1227 | return -EINVAL; | |
1228 | ||
1229 | if (p9_is_proto_dotl(clnt)) | |
1230 | req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); | |
1231 | else | |
1232 | req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); | |
1233 | if (IS_ERR(req)) { | |
1234 | err = PTR_ERR(req); | |
1235 | goto error; | |
1236 | } | |
1237 | ||
1238 | err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); | |
1239 | if (err) { | |
1240 | trace_9p_protocol_dump(clnt, req->rc); | |
1241 | goto free_and_error; | |
1242 | } | |
1243 | ||
1244 | p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", | |
1245 | p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, | |
1246 | (unsigned long long)qid.path, qid.version, iounit); | |
1247 | ||
1248 | fid->mode = mode; | |
1249 | fid->iounit = iounit; | |
1250 | ||
1251 | free_and_error: | |
1252 | p9_free_req(clnt, req); | |
1253 | error: | |
1254 | return err; | |
1255 | } | |
1256 | EXPORT_SYMBOL(p9_client_open); | |
1257 | ||
1258 | int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode, | |
1259 | gid_t gid, struct p9_qid *qid) | |
1260 | { | |
1261 | int err = 0; | |
1262 | struct p9_client *clnt; | |
1263 | struct p9_req_t *req; | |
1264 | int iounit; | |
1265 | ||
1266 | p9_debug(P9_DEBUG_9P, | |
1267 | ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", | |
1268 | ofid->fid, name, flags, mode, gid); | |
1269 | clnt = ofid->clnt; | |
1270 | ||
1271 | if (ofid->mode != -1) | |
1272 | return -EINVAL; | |
1273 | ||
1274 | req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags, | |
1275 | mode, gid); | |
1276 | if (IS_ERR(req)) { | |
1277 | err = PTR_ERR(req); | |
1278 | goto error; | |
1279 | } | |
1280 | ||
1281 | err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); | |
1282 | if (err) { | |
1283 | trace_9p_protocol_dump(clnt, req->rc); | |
1284 | goto free_and_error; | |
1285 | } | |
1286 | ||
1287 | p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", | |
1288 | qid->type, | |
1289 | (unsigned long long)qid->path, | |
1290 | qid->version, iounit); | |
1291 | ||
1292 | ofid->mode = mode; | |
1293 | ofid->iounit = iounit; | |
1294 | ||
1295 | free_and_error: | |
1296 | p9_free_req(clnt, req); | |
1297 | error: | |
1298 | return err; | |
1299 | } | |
1300 | EXPORT_SYMBOL(p9_client_create_dotl); | |
1301 | ||
1302 | int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, | |
1303 | char *extension) | |
1304 | { | |
1305 | int err; | |
1306 | struct p9_client *clnt; | |
1307 | struct p9_req_t *req; | |
1308 | struct p9_qid qid; | |
1309 | int iounit; | |
1310 | ||
1311 | p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", | |
1312 | fid->fid, name, perm, mode); | |
1313 | err = 0; | |
1314 | clnt = fid->clnt; | |
1315 | ||
1316 | if (fid->mode != -1) | |
1317 | return -EINVAL; | |
1318 | ||
1319 | req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, | |
1320 | mode, extension); | |
1321 | if (IS_ERR(req)) { | |
1322 | err = PTR_ERR(req); | |
1323 | goto error; | |
1324 | } | |
1325 | ||
1326 | err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); | |
1327 | if (err) { | |
1328 | trace_9p_protocol_dump(clnt, req->rc); | |
1329 | goto free_and_error; | |
1330 | } | |
1331 | ||
1332 | p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", | |
1333 | qid.type, | |
1334 | (unsigned long long)qid.path, | |
1335 | qid.version, iounit); | |
1336 | ||
1337 | fid->mode = mode; | |
1338 | fid->iounit = iounit; | |
1339 | ||
1340 | free_and_error: | |
1341 | p9_free_req(clnt, req); | |
1342 | error: | |
1343 | return err; | |
1344 | } | |
1345 | EXPORT_SYMBOL(p9_client_fcreate); | |
1346 | ||
1347 | int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid, | |
1348 | struct p9_qid *qid) | |
1349 | { | |
1350 | int err = 0; | |
1351 | struct p9_client *clnt; | |
1352 | struct p9_req_t *req; | |
1353 | ||
1354 | p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", | |
1355 | dfid->fid, name, symtgt); | |
1356 | clnt = dfid->clnt; | |
1357 | ||
1358 | req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt, | |
1359 | gid); | |
1360 | if (IS_ERR(req)) { | |
1361 | err = PTR_ERR(req); | |
1362 | goto error; | |
1363 | } | |
1364 | ||
1365 | err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); | |
1366 | if (err) { | |
1367 | trace_9p_protocol_dump(clnt, req->rc); | |
1368 | goto free_and_error; | |
1369 | } | |
1370 | ||
1371 | p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", | |
1372 | qid->type, (unsigned long long)qid->path, qid->version); | |
1373 | ||
1374 | free_and_error: | |
1375 | p9_free_req(clnt, req); | |
1376 | error: | |
1377 | return err; | |
1378 | } | |
1379 | EXPORT_SYMBOL(p9_client_symlink); | |
1380 | ||
1381 | int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname) | |
1382 | { | |
1383 | struct p9_client *clnt; | |
1384 | struct p9_req_t *req; | |
1385 | ||
1386 | p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", | |
1387 | dfid->fid, oldfid->fid, newname); | |
1388 | clnt = dfid->clnt; | |
1389 | req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, | |
1390 | newname); | |
1391 | if (IS_ERR(req)) | |
1392 | return PTR_ERR(req); | |
1393 | ||
1394 | p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); | |
1395 | p9_free_req(clnt, req); | |
1396 | return 0; | |
1397 | } | |
1398 | EXPORT_SYMBOL(p9_client_link); | |
1399 | ||
1400 | int p9_client_fsync(struct p9_fid *fid, int datasync) | |
1401 | { | |
1402 | int err; | |
1403 | struct p9_client *clnt; | |
1404 | struct p9_req_t *req; | |
1405 | ||
1406 | p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", | |
1407 | fid->fid, datasync); | |
1408 | err = 0; | |
1409 | clnt = fid->clnt; | |
1410 | ||
1411 | req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); | |
1412 | if (IS_ERR(req)) { | |
1413 | err = PTR_ERR(req); | |
1414 | goto error; | |
1415 | } | |
1416 | ||
1417 | p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); | |
1418 | ||
1419 | p9_free_req(clnt, req); | |
1420 | ||
1421 | error: | |
1422 | return err; | |
1423 | } | |
1424 | EXPORT_SYMBOL(p9_client_fsync); | |
1425 | ||
1426 | int p9_client_clunk(struct p9_fid *fid) | |
1427 | { | |
1428 | int err; | |
1429 | struct p9_client *clnt; | |
1430 | struct p9_req_t *req; | |
1431 | int retries = 0; | |
1432 | ||
1433 | if (!fid) { | |
1434 | pr_warn("%s (%d): Trying to clunk with NULL fid\n", | |
1435 | __func__, task_pid_nr(current)); | |
1436 | dump_stack(); | |
1437 | return 0; | |
1438 | } | |
1439 | ||
1440 | again: | |
1441 | p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, | |
1442 | retries); | |
1443 | err = 0; | |
1444 | clnt = fid->clnt; | |
1445 | ||
1446 | req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); | |
1447 | if (IS_ERR(req)) { | |
1448 | err = PTR_ERR(req); | |
1449 | goto error; | |
1450 | } | |
1451 | ||
1452 | p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); | |
1453 | ||
1454 | p9_free_req(clnt, req); | |
1455 | error: | |
1456 | /* | |
1457 | * Fid is not valid even after a failed clunk | |
1458 | * If interrupted, retry once then give up and | |
1459 | * leak fid until umount. | |
1460 | */ | |
1461 | if (err == -ERESTARTSYS) { | |
1462 | if (retries++ == 0) | |
1463 | goto again; | |
1464 | } else | |
1465 | p9_fid_destroy(fid); | |
1466 | return err; | |
1467 | } | |
1468 | EXPORT_SYMBOL(p9_client_clunk); | |
1469 | ||
1470 | int p9_client_remove(struct p9_fid *fid) | |
1471 | { | |
1472 | int err; | |
1473 | struct p9_client *clnt; | |
1474 | struct p9_req_t *req; | |
1475 | ||
1476 | p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); | |
1477 | err = 0; | |
1478 | clnt = fid->clnt; | |
1479 | ||
1480 | req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); | |
1481 | if (IS_ERR(req)) { | |
1482 | err = PTR_ERR(req); | |
1483 | goto error; | |
1484 | } | |
1485 | ||
1486 | p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); | |
1487 | ||
1488 | p9_free_req(clnt, req); | |
1489 | error: | |
1490 | if (err == -ERESTARTSYS) | |
1491 | p9_client_clunk(fid); | |
1492 | else | |
1493 | p9_fid_destroy(fid); | |
1494 | return err; | |
1495 | } | |
1496 | EXPORT_SYMBOL(p9_client_remove); | |
1497 | ||
1498 | int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) | |
1499 | { | |
1500 | int err = 0; | |
1501 | struct p9_req_t *req; | |
1502 | struct p9_client *clnt; | |
1503 | ||
1504 | p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", | |
1505 | dfid->fid, name, flags); | |
1506 | ||
1507 | clnt = dfid->clnt; | |
1508 | req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); | |
1509 | if (IS_ERR(req)) { | |
1510 | err = PTR_ERR(req); | |
1511 | goto error; | |
1512 | } | |
1513 | p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); | |
1514 | ||
1515 | p9_free_req(clnt, req); | |
1516 | error: | |
1517 | return err; | |
1518 | } | |
1519 | EXPORT_SYMBOL(p9_client_unlinkat); | |
1520 | ||
1521 | int | |
1522 | p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, | |
1523 | u32 count) | |
1524 | { | |
1525 | char *dataptr; | |
1526 | int kernel_buf = 0; | |
1527 | struct p9_req_t *req; | |
1528 | struct p9_client *clnt; | |
1529 | int err, rsize, non_zc = 0; | |
1530 | ||
1531 | ||
1532 | p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", | |
1533 | fid->fid, (unsigned long long) offset, count); | |
1534 | err = 0; | |
1535 | clnt = fid->clnt; | |
1536 | ||
1537 | rsize = fid->iounit; | |
1538 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1539 | rsize = clnt->msize - P9_IOHDRSZ; | |
1540 | ||
1541 | if (count < rsize) | |
1542 | rsize = count; | |
1543 | ||
1544 | /* Don't bother zerocopy for small IO (< 1024) */ | |
1545 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
1546 | char *indata; | |
1547 | if (data) { | |
1548 | kernel_buf = 1; | |
1549 | indata = data; | |
1550 | } else | |
1551 | indata = (char *)udata; | |
1552 | /* | |
1553 | * response header len is 11 | |
1554 | * PDU Header(7) + IO Size (4) | |
1555 | */ | |
1556 | req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0, | |
1557 | 11, kernel_buf, "dqd", fid->fid, | |
1558 | offset, rsize); | |
1559 | } else { | |
1560 | non_zc = 1; | |
1561 | req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, | |
1562 | rsize); | |
1563 | } | |
1564 | if (IS_ERR(req)) { | |
1565 | err = PTR_ERR(req); | |
1566 | goto error; | |
1567 | } | |
1568 | ||
1569 | err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); | |
1570 | if (err) { | |
1571 | trace_9p_protocol_dump(clnt, req->rc); | |
1572 | goto free_and_error; | |
1573 | } | |
1574 | ||
1575 | p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); | |
1576 | ||
1577 | if (non_zc) { | |
1578 | if (data) { | |
1579 | memmove(data, dataptr, count); | |
1580 | } else { | |
1581 | err = copy_to_user(udata, dataptr, count); | |
1582 | if (err) { | |
1583 | err = -EFAULT; | |
1584 | goto free_and_error; | |
1585 | } | |
1586 | } | |
1587 | } | |
1588 | p9_free_req(clnt, req); | |
1589 | return count; | |
1590 | ||
1591 | free_and_error: | |
1592 | p9_free_req(clnt, req); | |
1593 | error: | |
1594 | return err; | |
1595 | } | |
1596 | EXPORT_SYMBOL(p9_client_read); | |
1597 | ||
1598 | int | |
1599 | p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, | |
1600 | u64 offset, u32 count) | |
1601 | { | |
1602 | int err, rsize; | |
1603 | int kernel_buf = 0; | |
1604 | struct p9_client *clnt; | |
1605 | struct p9_req_t *req; | |
1606 | ||
1607 | p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", | |
1608 | fid->fid, (unsigned long long) offset, count); | |
1609 | err = 0; | |
1610 | clnt = fid->clnt; | |
1611 | ||
1612 | rsize = fid->iounit; | |
1613 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1614 | rsize = clnt->msize - P9_IOHDRSZ; | |
1615 | ||
1616 | if (count < rsize) | |
1617 | rsize = count; | |
1618 | ||
1619 | /* Don't bother zerocopy for small IO (< 1024) */ | |
1620 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
1621 | char *odata; | |
1622 | if (data) { | |
1623 | kernel_buf = 1; | |
1624 | odata = data; | |
1625 | } else | |
1626 | odata = (char *)udata; | |
1627 | req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize, | |
1628 | P9_ZC_HDR_SZ, kernel_buf, "dqd", | |
1629 | fid->fid, offset, rsize); | |
1630 | } else { | |
1631 | if (data) | |
1632 | req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, | |
1633 | offset, rsize, data); | |
1634 | else | |
1635 | req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, | |
1636 | offset, rsize, udata); | |
1637 | } | |
1638 | if (IS_ERR(req)) { | |
1639 | err = PTR_ERR(req); | |
1640 | goto error; | |
1641 | } | |
1642 | ||
1643 | err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); | |
1644 | if (err) { | |
1645 | trace_9p_protocol_dump(clnt, req->rc); | |
1646 | goto free_and_error; | |
1647 | } | |
1648 | ||
1649 | p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); | |
1650 | ||
1651 | p9_free_req(clnt, req); | |
1652 | return count; | |
1653 | ||
1654 | free_and_error: | |
1655 | p9_free_req(clnt, req); | |
1656 | error: | |
1657 | return err; | |
1658 | } | |
1659 | EXPORT_SYMBOL(p9_client_write); | |
1660 | ||
1661 | struct p9_wstat *p9_client_stat(struct p9_fid *fid) | |
1662 | { | |
1663 | int err; | |
1664 | struct p9_client *clnt; | |
1665 | struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); | |
1666 | struct p9_req_t *req; | |
1667 | u16 ignored; | |
1668 | ||
1669 | p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); | |
1670 | ||
1671 | if (!ret) | |
1672 | return ERR_PTR(-ENOMEM); | |
1673 | ||
1674 | err = 0; | |
1675 | clnt = fid->clnt; | |
1676 | ||
1677 | req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); | |
1678 | if (IS_ERR(req)) { | |
1679 | err = PTR_ERR(req); | |
1680 | goto error; | |
1681 | } | |
1682 | ||
1683 | err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); | |
1684 | if (err) { | |
1685 | trace_9p_protocol_dump(clnt, req->rc); | |
1686 | p9_free_req(clnt, req); | |
1687 | goto error; | |
1688 | } | |
1689 | ||
1690 | p9_debug(P9_DEBUG_9P, | |
1691 | "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" | |
1692 | "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1693 | "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1694 | "<<< uid=%d gid=%d n_muid=%d\n", | |
1695 | ret->size, ret->type, ret->dev, ret->qid.type, | |
1696 | (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, | |
1697 | ret->atime, ret->mtime, (unsigned long long)ret->length, | |
1698 | ret->name, ret->uid, ret->gid, ret->muid, ret->extension, | |
1699 | ret->n_uid, ret->n_gid, ret->n_muid); | |
1700 | ||
1701 | p9_free_req(clnt, req); | |
1702 | return ret; | |
1703 | ||
1704 | error: | |
1705 | kfree(ret); | |
1706 | return ERR_PTR(err); | |
1707 | } | |
1708 | EXPORT_SYMBOL(p9_client_stat); | |
1709 | ||
1710 | struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, | |
1711 | u64 request_mask) | |
1712 | { | |
1713 | int err; | |
1714 | struct p9_client *clnt; | |
1715 | struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), | |
1716 | GFP_KERNEL); | |
1717 | struct p9_req_t *req; | |
1718 | ||
1719 | p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", | |
1720 | fid->fid, request_mask); | |
1721 | ||
1722 | if (!ret) | |
1723 | return ERR_PTR(-ENOMEM); | |
1724 | ||
1725 | err = 0; | |
1726 | clnt = fid->clnt; | |
1727 | ||
1728 | req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); | |
1729 | if (IS_ERR(req)) { | |
1730 | err = PTR_ERR(req); | |
1731 | goto error; | |
1732 | } | |
1733 | ||
1734 | err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); | |
1735 | if (err) { | |
1736 | trace_9p_protocol_dump(clnt, req->rc); | |
1737 | p9_free_req(clnt, req); | |
1738 | goto error; | |
1739 | } | |
1740 | ||
1741 | p9_debug(P9_DEBUG_9P, | |
1742 | "<<< RGETATTR st_result_mask=%lld\n" | |
1743 | "<<< qid=%x.%llx.%x\n" | |
1744 | "<<< st_mode=%8.8x st_nlink=%llu\n" | |
1745 | "<<< st_uid=%d st_gid=%d\n" | |
1746 | "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" | |
1747 | "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" | |
1748 | "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" | |
1749 | "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" | |
1750 | "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" | |
1751 | "<<< st_gen=%lld st_data_version=%lld", | |
1752 | ret->st_result_mask, ret->qid.type, ret->qid.path, | |
1753 | ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid, | |
1754 | ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize, | |
1755 | ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, | |
1756 | ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, | |
1757 | ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, | |
1758 | ret->st_gen, ret->st_data_version); | |
1759 | ||
1760 | p9_free_req(clnt, req); | |
1761 | return ret; | |
1762 | ||
1763 | error: | |
1764 | kfree(ret); | |
1765 | return ERR_PTR(err); | |
1766 | } | |
1767 | EXPORT_SYMBOL(p9_client_getattr_dotl); | |
1768 | ||
1769 | static int p9_client_statsize(struct p9_wstat *wst, int proto_version) | |
1770 | { | |
1771 | int ret; | |
1772 | ||
1773 | /* NOTE: size shouldn't include its own length */ | |
1774 | /* size[2] type[2] dev[4] qid[13] */ | |
1775 | /* mode[4] atime[4] mtime[4] length[8]*/ | |
1776 | /* name[s] uid[s] gid[s] muid[s] */ | |
1777 | ret = 2+4+13+4+4+4+8+2+2+2+2; | |
1778 | ||
1779 | if (wst->name) | |
1780 | ret += strlen(wst->name); | |
1781 | if (wst->uid) | |
1782 | ret += strlen(wst->uid); | |
1783 | if (wst->gid) | |
1784 | ret += strlen(wst->gid); | |
1785 | if (wst->muid) | |
1786 | ret += strlen(wst->muid); | |
1787 | ||
1788 | if ((proto_version == p9_proto_2000u) || | |
1789 | (proto_version == p9_proto_2000L)) { | |
1790 | ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ | |
1791 | if (wst->extension) | |
1792 | ret += strlen(wst->extension); | |
1793 | } | |
1794 | ||
1795 | return ret; | |
1796 | } | |
1797 | ||
1798 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) | |
1799 | { | |
1800 | int err; | |
1801 | struct p9_req_t *req; | |
1802 | struct p9_client *clnt; | |
1803 | ||
1804 | err = 0; | |
1805 | clnt = fid->clnt; | |
1806 | wst->size = p9_client_statsize(wst, clnt->proto_version); | |
1807 | p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); | |
1808 | p9_debug(P9_DEBUG_9P, | |
1809 | " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" | |
1810 | " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1811 | " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1812 | " uid=%d gid=%d n_muid=%d\n", | |
1813 | wst->size, wst->type, wst->dev, wst->qid.type, | |
1814 | (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, | |
1815 | wst->atime, wst->mtime, (unsigned long long)wst->length, | |
1816 | wst->name, wst->uid, wst->gid, wst->muid, wst->extension, | |
1817 | wst->n_uid, wst->n_gid, wst->n_muid); | |
1818 | ||
1819 | req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); | |
1820 | if (IS_ERR(req)) { | |
1821 | err = PTR_ERR(req); | |
1822 | goto error; | |
1823 | } | |
1824 | ||
1825 | p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); | |
1826 | ||
1827 | p9_free_req(clnt, req); | |
1828 | error: | |
1829 | return err; | |
1830 | } | |
1831 | EXPORT_SYMBOL(p9_client_wstat); | |
1832 | ||
1833 | int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) | |
1834 | { | |
1835 | int err; | |
1836 | struct p9_req_t *req; | |
1837 | struct p9_client *clnt; | |
1838 | ||
1839 | err = 0; | |
1840 | clnt = fid->clnt; | |
1841 | p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); | |
1842 | p9_debug(P9_DEBUG_9P, | |
1843 | " valid=%x mode=%x uid=%d gid=%d size=%lld\n" | |
1844 | " atime_sec=%lld atime_nsec=%lld\n" | |
1845 | " mtime_sec=%lld mtime_nsec=%lld\n", | |
1846 | p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid, | |
1847 | p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, | |
1848 | p9attr->mtime_sec, p9attr->mtime_nsec); | |
1849 | ||
1850 | req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); | |
1851 | ||
1852 | if (IS_ERR(req)) { | |
1853 | err = PTR_ERR(req); | |
1854 | goto error; | |
1855 | } | |
1856 | p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); | |
1857 | p9_free_req(clnt, req); | |
1858 | error: | |
1859 | return err; | |
1860 | } | |
1861 | EXPORT_SYMBOL(p9_client_setattr); | |
1862 | ||
1863 | int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) | |
1864 | { | |
1865 | int err; | |
1866 | struct p9_req_t *req; | |
1867 | struct p9_client *clnt; | |
1868 | ||
1869 | err = 0; | |
1870 | clnt = fid->clnt; | |
1871 | ||
1872 | p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); | |
1873 | ||
1874 | req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); | |
1875 | if (IS_ERR(req)) { | |
1876 | err = PTR_ERR(req); | |
1877 | goto error; | |
1878 | } | |
1879 | ||
1880 | err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, | |
1881 | &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, | |
1882 | &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); | |
1883 | if (err) { | |
1884 | trace_9p_protocol_dump(clnt, req->rc); | |
1885 | p9_free_req(clnt, req); | |
1886 | goto error; | |
1887 | } | |
1888 | ||
1889 | p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " | |
1890 | "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " | |
1891 | "fsid %llu namelen %ld\n", | |
1892 | fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, | |
1893 | sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, | |
1894 | sb->fsid, (long int)sb->namelen); | |
1895 | ||
1896 | p9_free_req(clnt, req); | |
1897 | error: | |
1898 | return err; | |
1899 | } | |
1900 | EXPORT_SYMBOL(p9_client_statfs); | |
1901 | ||
1902 | int p9_client_rename(struct p9_fid *fid, | |
1903 | struct p9_fid *newdirfid, const char *name) | |
1904 | { | |
1905 | int err; | |
1906 | struct p9_req_t *req; | |
1907 | struct p9_client *clnt; | |
1908 | ||
1909 | err = 0; | |
1910 | clnt = fid->clnt; | |
1911 | ||
1912 | p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", | |
1913 | fid->fid, newdirfid->fid, name); | |
1914 | ||
1915 | req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, | |
1916 | newdirfid->fid, name); | |
1917 | if (IS_ERR(req)) { | |
1918 | err = PTR_ERR(req); | |
1919 | goto error; | |
1920 | } | |
1921 | ||
1922 | p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); | |
1923 | ||
1924 | p9_free_req(clnt, req); | |
1925 | error: | |
1926 | return err; | |
1927 | } | |
1928 | EXPORT_SYMBOL(p9_client_rename); | |
1929 | ||
1930 | int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, | |
1931 | struct p9_fid *newdirfid, const char *new_name) | |
1932 | { | |
1933 | int err; | |
1934 | struct p9_req_t *req; | |
1935 | struct p9_client *clnt; | |
1936 | ||
1937 | err = 0; | |
1938 | clnt = olddirfid->clnt; | |
1939 | ||
1940 | p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" | |
1941 | " newdirfid %d new name %s\n", olddirfid->fid, old_name, | |
1942 | newdirfid->fid, new_name); | |
1943 | ||
1944 | req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, | |
1945 | old_name, newdirfid->fid, new_name); | |
1946 | if (IS_ERR(req)) { | |
1947 | err = PTR_ERR(req); | |
1948 | goto error; | |
1949 | } | |
1950 | ||
1951 | p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", | |
1952 | newdirfid->fid, new_name); | |
1953 | ||
1954 | p9_free_req(clnt, req); | |
1955 | error: | |
1956 | return err; | |
1957 | } | |
1958 | EXPORT_SYMBOL(p9_client_renameat); | |
1959 | ||
1960 | /* | |
1961 | * An xattrwalk without @attr_name gives the fid for the lisxattr namespace | |
1962 | */ | |
1963 | struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, | |
1964 | const char *attr_name, u64 *attr_size) | |
1965 | { | |
1966 | int err; | |
1967 | struct p9_req_t *req; | |
1968 | struct p9_client *clnt; | |
1969 | struct p9_fid *attr_fid; | |
1970 | ||
1971 | err = 0; | |
1972 | clnt = file_fid->clnt; | |
1973 | attr_fid = p9_fid_create(clnt); | |
1974 | if (IS_ERR(attr_fid)) { | |
1975 | err = PTR_ERR(attr_fid); | |
1976 | attr_fid = NULL; | |
1977 | goto error; | |
1978 | } | |
1979 | p9_debug(P9_DEBUG_9P, | |
1980 | ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", | |
1981 | file_fid->fid, attr_fid->fid, attr_name); | |
1982 | ||
1983 | req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", | |
1984 | file_fid->fid, attr_fid->fid, attr_name); | |
1985 | if (IS_ERR(req)) { | |
1986 | err = PTR_ERR(req); | |
1987 | goto error; | |
1988 | } | |
1989 | err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); | |
1990 | if (err) { | |
1991 | trace_9p_protocol_dump(clnt, req->rc); | |
1992 | p9_free_req(clnt, req); | |
1993 | goto clunk_fid; | |
1994 | } | |
1995 | p9_free_req(clnt, req); | |
1996 | p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", | |
1997 | attr_fid->fid, *attr_size); | |
1998 | return attr_fid; | |
1999 | clunk_fid: | |
2000 | p9_client_clunk(attr_fid); | |
2001 | attr_fid = NULL; | |
2002 | error: | |
2003 | if (attr_fid && (attr_fid != file_fid)) | |
2004 | p9_fid_destroy(attr_fid); | |
2005 | ||
2006 | return ERR_PTR(err); | |
2007 | } | |
2008 | EXPORT_SYMBOL_GPL(p9_client_xattrwalk); | |
2009 | ||
2010 | int p9_client_xattrcreate(struct p9_fid *fid, const char *name, | |
2011 | u64 attr_size, int flags) | |
2012 | { | |
2013 | int err; | |
2014 | struct p9_req_t *req; | |
2015 | struct p9_client *clnt; | |
2016 | ||
2017 | p9_debug(P9_DEBUG_9P, | |
2018 | ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", | |
2019 | fid->fid, name, (long long)attr_size, flags); | |
2020 | err = 0; | |
2021 | clnt = fid->clnt; | |
2022 | req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", | |
2023 | fid->fid, name, attr_size, flags); | |
2024 | if (IS_ERR(req)) { | |
2025 | err = PTR_ERR(req); | |
2026 | goto error; | |
2027 | } | |
2028 | p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); | |
2029 | p9_free_req(clnt, req); | |
2030 | error: | |
2031 | return err; | |
2032 | } | |
2033 | EXPORT_SYMBOL_GPL(p9_client_xattrcreate); | |
2034 | ||
2035 | int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) | |
2036 | { | |
2037 | int err, rsize, non_zc = 0; | |
2038 | struct p9_client *clnt; | |
2039 | struct p9_req_t *req; | |
2040 | char *dataptr; | |
2041 | ||
2042 | p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", | |
2043 | fid->fid, (unsigned long long) offset, count); | |
2044 | ||
2045 | err = 0; | |
2046 | clnt = fid->clnt; | |
2047 | ||
2048 | rsize = fid->iounit; | |
2049 | if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) | |
2050 | rsize = clnt->msize - P9_READDIRHDRSZ; | |
2051 | ||
2052 | if (count < rsize) | |
2053 | rsize = count; | |
2054 | ||
2055 | /* Don't bother zerocopy for small IO (< 1024) */ | |
2056 | if (clnt->trans_mod->zc_request && rsize > 1024) { | |
2057 | /* | |
2058 | * response header len is 11 | |
2059 | * PDU Header(7) + IO Size (4) | |
2060 | */ | |
2061 | req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0, | |
2062 | 11, 1, "dqd", fid->fid, offset, rsize); | |
2063 | } else { | |
2064 | non_zc = 1; | |
2065 | req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, | |
2066 | offset, rsize); | |
2067 | } | |
2068 | if (IS_ERR(req)) { | |
2069 | err = PTR_ERR(req); | |
2070 | goto error; | |
2071 | } | |
2072 | ||
2073 | err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); | |
2074 | if (err) { | |
2075 | trace_9p_protocol_dump(clnt, req->rc); | |
2076 | goto free_and_error; | |
2077 | } | |
2078 | ||
2079 | p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); | |
2080 | ||
2081 | if (non_zc) | |
2082 | memmove(data, dataptr, count); | |
2083 | ||
2084 | p9_free_req(clnt, req); | |
2085 | return count; | |
2086 | ||
2087 | free_and_error: | |
2088 | p9_free_req(clnt, req); | |
2089 | error: | |
2090 | return err; | |
2091 | } | |
2092 | EXPORT_SYMBOL(p9_client_readdir); | |
2093 | ||
2094 | int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode, | |
2095 | dev_t rdev, gid_t gid, struct p9_qid *qid) | |
2096 | { | |
2097 | int err; | |
2098 | struct p9_client *clnt; | |
2099 | struct p9_req_t *req; | |
2100 | ||
2101 | err = 0; | |
2102 | clnt = fid->clnt; | |
2103 | p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " | |
2104 | "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); | |
2105 | req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode, | |
2106 | MAJOR(rdev), MINOR(rdev), gid); | |
2107 | if (IS_ERR(req)) | |
2108 | return PTR_ERR(req); | |
2109 | ||
2110 | err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); | |
2111 | if (err) { | |
2112 | trace_9p_protocol_dump(clnt, req->rc); | |
2113 | goto error; | |
2114 | } | |
2115 | p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, | |
2116 | (unsigned long long)qid->path, qid->version); | |
2117 | ||
2118 | error: | |
2119 | p9_free_req(clnt, req); | |
2120 | return err; | |
2121 | ||
2122 | } | |
2123 | EXPORT_SYMBOL(p9_client_mknod_dotl); | |
2124 | ||
2125 | int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode, | |
2126 | gid_t gid, struct p9_qid *qid) | |
2127 | { | |
2128 | int err; | |
2129 | struct p9_client *clnt; | |
2130 | struct p9_req_t *req; | |
2131 | ||
2132 | err = 0; | |
2133 | clnt = fid->clnt; | |
2134 | p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", | |
2135 | fid->fid, name, mode, gid); | |
2136 | req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode, | |
2137 | gid); | |
2138 | if (IS_ERR(req)) | |
2139 | return PTR_ERR(req); | |
2140 | ||
2141 | err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); | |
2142 | if (err) { | |
2143 | trace_9p_protocol_dump(clnt, req->rc); | |
2144 | goto error; | |
2145 | } | |
2146 | p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, | |
2147 | (unsigned long long)qid->path, qid->version); | |
2148 | ||
2149 | error: | |
2150 | p9_free_req(clnt, req); | |
2151 | return err; | |
2152 | ||
2153 | } | |
2154 | EXPORT_SYMBOL(p9_client_mkdir_dotl); | |
2155 | ||
2156 | int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) | |
2157 | { | |
2158 | int err; | |
2159 | struct p9_client *clnt; | |
2160 | struct p9_req_t *req; | |
2161 | ||
2162 | err = 0; | |
2163 | clnt = fid->clnt; | |
2164 | p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " | |
2165 | "start %lld length %lld proc_id %d client_id %s\n", | |
2166 | fid->fid, flock->type, flock->flags, flock->start, | |
2167 | flock->length, flock->proc_id, flock->client_id); | |
2168 | ||
2169 | req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, | |
2170 | flock->flags, flock->start, flock->length, | |
2171 | flock->proc_id, flock->client_id); | |
2172 | ||
2173 | if (IS_ERR(req)) | |
2174 | return PTR_ERR(req); | |
2175 | ||
2176 | err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); | |
2177 | if (err) { | |
2178 | trace_9p_protocol_dump(clnt, req->rc); | |
2179 | goto error; | |
2180 | } | |
2181 | p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); | |
2182 | error: | |
2183 | p9_free_req(clnt, req); | |
2184 | return err; | |
2185 | ||
2186 | } | |
2187 | EXPORT_SYMBOL(p9_client_lock_dotl); | |
2188 | ||
2189 | int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) | |
2190 | { | |
2191 | int err; | |
2192 | struct p9_client *clnt; | |
2193 | struct p9_req_t *req; | |
2194 | ||
2195 | err = 0; | |
2196 | clnt = fid->clnt; | |
2197 | p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " | |
2198 | "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, | |
2199 | glock->start, glock->length, glock->proc_id, glock->client_id); | |
2200 | ||
2201 | req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, | |
2202 | glock->start, glock->length, glock->proc_id, glock->client_id); | |
2203 | ||
2204 | if (IS_ERR(req)) | |
2205 | return PTR_ERR(req); | |
2206 | ||
2207 | err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, | |
2208 | &glock->start, &glock->length, &glock->proc_id, | |
2209 | &glock->client_id); | |
2210 | if (err) { | |
2211 | trace_9p_protocol_dump(clnt, req->rc); | |
2212 | goto error; | |
2213 | } | |
2214 | p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " | |
2215 | "proc_id %d client_id %s\n", glock->type, glock->start, | |
2216 | glock->length, glock->proc_id, glock->client_id); | |
2217 | error: | |
2218 | p9_free_req(clnt, req); | |
2219 | return err; | |
2220 | } | |
2221 | EXPORT_SYMBOL(p9_client_getlock_dotl); | |
2222 | ||
2223 | int p9_client_readlink(struct p9_fid *fid, char **target) | |
2224 | { | |
2225 | int err; | |
2226 | struct p9_client *clnt; | |
2227 | struct p9_req_t *req; | |
2228 | ||
2229 | err = 0; | |
2230 | clnt = fid->clnt; | |
2231 | p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); | |
2232 | ||
2233 | req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); | |
2234 | if (IS_ERR(req)) | |
2235 | return PTR_ERR(req); | |
2236 | ||
2237 | err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); | |
2238 | if (err) { | |
2239 | trace_9p_protocol_dump(clnt, req->rc); | |
2240 | goto error; | |
2241 | } | |
2242 | p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); | |
2243 | error: | |
2244 | p9_free_req(clnt, req); | |
2245 | return err; | |
2246 | } | |
2247 | EXPORT_SYMBOL(p9_client_readlink); |