Commit | Line | Data |
---|---|---|
bd238fb4 LI |
1 | /* |
2 | * net/9p/clnt.c | |
3 | * | |
4 | * 9P Client | |
5 | * | |
8a0dc95f | 6 | * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> |
bd238fb4 LI |
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 | #include <linux/module.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/fs.h> | |
8a0dc95f | 29 | #include <linux/poll.h> |
bd238fb4 LI |
30 | #include <linux/idr.h> |
31 | #include <linux/mutex.h> | |
5a0e3ad6 | 32 | #include <linux/slab.h> |
bd238fb4 LI |
33 | #include <linux/sched.h> |
34 | #include <linux/uaccess.h> | |
35 | #include <net/9p/9p.h> | |
fb0466c3 | 36 | #include <linux/parser.h> |
bd238fb4 | 37 | #include <net/9p/client.h> |
8b81ef58 | 38 | #include <net/9p/transport.h> |
51a87c55 | 39 | #include "protocol.h" |
bd238fb4 | 40 | |
8a0dc95f EVH |
41 | /* |
42 | * Client Option Parsing (code inspired by NFS code) | |
43 | * - a little lazy - parse all client options | |
44 | */ | |
45 | ||
46 | enum { | |
47 | Opt_msize, | |
48 | Opt_trans, | |
49 | Opt_legacy, | |
0fb80abd | 50 | Opt_version, |
8a0dc95f EVH |
51 | Opt_err, |
52 | }; | |
53 | ||
a447c093 | 54 | static const match_table_t tokens = { |
8a0dc95f EVH |
55 | {Opt_msize, "msize=%u"}, |
56 | {Opt_legacy, "noextend"}, | |
57 | {Opt_trans, "trans=%s"}, | |
0fb80abd | 58 | {Opt_version, "version=%s"}, |
8a0dc95f EVH |
59 | {Opt_err, NULL}, |
60 | }; | |
61 | ||
342fee1d SK |
62 | inline int p9_is_proto_dotl(struct p9_client *clnt) |
63 | { | |
a02cec21 | 64 | return clnt->proto_version == p9_proto_2000L; |
342fee1d SK |
65 | } |
66 | EXPORT_SYMBOL(p9_is_proto_dotl); | |
67 | ||
68 | inline int p9_is_proto_dotu(struct p9_client *clnt) | |
69 | { | |
a02cec21 | 70 | return clnt->proto_version == p9_proto_2000u; |
342fee1d SK |
71 | } |
72 | EXPORT_SYMBOL(p9_is_proto_dotu); | |
73 | ||
0fb80abd | 74 | /* Interpret mount option for protocol version */ |
4d63055f | 75 | static int get_protocol_version(char *s) |
0fb80abd | 76 | { |
3dc9fef6 DC |
77 | int version = -EINVAL; |
78 | ||
4d63055f | 79 | if (!strcmp(s, "9p2000")) { |
0fb80abd SK |
80 | version = p9_proto_legacy; |
81 | P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n"); | |
4d63055f | 82 | } else if (!strcmp(s, "9p2000.u")) { |
0fb80abd SK |
83 | version = p9_proto_2000u; |
84 | P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); | |
4d63055f | 85 | } else if (!strcmp(s, "9p2000.L")) { |
45bc21ed SK |
86 | version = p9_proto_2000L; |
87 | P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); | |
4d63055f PK |
88 | } else |
89 | printk(KERN_INFO "9p: Unknown protocol version %s.\n", s); | |
90 | ||
0fb80abd SK |
91 | return version; |
92 | } | |
93 | ||
8a0dc95f | 94 | /** |
0e15597e AK |
95 | * parse_options - parse mount options into client structure |
96 | * @opts: options string passed from mount | |
97 | * @clnt: existing v9fs client information | |
8a0dc95f | 98 | * |
bb8ffdfc | 99 | * Return 0 upon success, -ERRNO upon failure |
8a0dc95f EVH |
100 | */ |
101 | ||
bb8ffdfc | 102 | static int parse_opts(char *opts, struct p9_client *clnt) |
8a0dc95f | 103 | { |
d8c8a9e3 | 104 | char *options, *tmp_options; |
8a0dc95f EVH |
105 | char *p; |
106 | substring_t args[MAX_OPT_ARGS]; | |
107 | int option; | |
4d63055f | 108 | char *s; |
bb8ffdfc | 109 | int ret = 0; |
8a0dc95f | 110 | |
342fee1d | 111 | clnt->proto_version = p9_proto_2000u; |
8a0dc95f EVH |
112 | clnt->msize = 8192; |
113 | ||
bb8ffdfc EVH |
114 | if (!opts) |
115 | return 0; | |
116 | ||
d8c8a9e3 EVH |
117 | tmp_options = kstrdup(opts, GFP_KERNEL); |
118 | if (!tmp_options) { | |
bb8ffdfc EVH |
119 | P9_DPRINTK(P9_DEBUG_ERROR, |
120 | "failed to allocate copy of option string\n"); | |
121 | return -ENOMEM; | |
122 | } | |
d8c8a9e3 | 123 | options = tmp_options; |
8a0dc95f EVH |
124 | |
125 | while ((p = strsep(&options, ",")) != NULL) { | |
126 | int token; | |
127 | if (!*p) | |
128 | continue; | |
129 | token = match_token(p, tokens, args); | |
130 | if (token < Opt_trans) { | |
bb8ffdfc EVH |
131 | int r = match_int(&args[0], &option); |
132 | if (r < 0) { | |
8a0dc95f EVH |
133 | P9_DPRINTK(P9_DEBUG_ERROR, |
134 | "integer field, but no integer?\n"); | |
bb8ffdfc | 135 | ret = r; |
8a0dc95f EVH |
136 | continue; |
137 | } | |
138 | } | |
139 | switch (token) { | |
140 | case Opt_msize: | |
141 | clnt->msize = option; | |
142 | break; | |
143 | case Opt_trans: | |
4d63055f PK |
144 | s = match_strdup(&args[0]); |
145 | if (!s) { | |
146 | ret = -ENOMEM; | |
349d3bb8 | 147 | P9_DPRINTK(P9_DEBUG_ERROR, |
4d63055f PK |
148 | "problem allocating copy of trans arg\n"); |
149 | goto free_and_return; | |
150 | } | |
151 | clnt->trans_mod = v9fs_get_trans_by_name(s); | |
152 | if (clnt->trans_mod == NULL) { | |
153 | printk(KERN_INFO | |
154 | "9p: Could not find " | |
155 | "request transport: %s\n", s); | |
349d3bb8 | 156 | ret = -EINVAL; |
4d63055f | 157 | kfree(s); |
349d3bb8 EVH |
158 | goto free_and_return; |
159 | } | |
4d63055f | 160 | kfree(s); |
8a0dc95f EVH |
161 | break; |
162 | case Opt_legacy: | |
342fee1d | 163 | clnt->proto_version = p9_proto_legacy; |
8a0dc95f | 164 | break; |
0fb80abd | 165 | case Opt_version: |
4d63055f PK |
166 | s = match_strdup(&args[0]); |
167 | if (!s) { | |
168 | ret = -ENOMEM; | |
169 | P9_DPRINTK(P9_DEBUG_ERROR, | |
170 | "problem allocating copy of version arg\n"); | |
0fb80abd | 171 | goto free_and_return; |
4d63055f PK |
172 | } |
173 | ret = get_protocol_version(s); | |
174 | if (ret == -EINVAL) { | |
175 | kfree(s); | |
176 | goto free_and_return; | |
177 | } | |
178 | kfree(s); | |
0fb80abd SK |
179 | clnt->proto_version = ret; |
180 | break; | |
8a0dc95f EVH |
181 | default: |
182 | continue; | |
183 | } | |
184 | } | |
72029fe8 | 185 | |
349d3bb8 | 186 | free_and_return: |
d8c8a9e3 | 187 | kfree(tmp_options); |
bb8ffdfc | 188 | return ret; |
8a0dc95f EVH |
189 | } |
190 | ||
fea511a6 EVH |
191 | /** |
192 | * p9_tag_alloc - lookup/allocate a request by tag | |
193 | * @c: client session to lookup tag within | |
194 | * @tag: numeric id for transaction | |
195 | * | |
196 | * this is a simple array lookup, but will grow the | |
25985edc | 197 | * request_slots as necessary to accommodate transaction |
fea511a6 EVH |
198 | * ids which did not previously have a slot. |
199 | * | |
200 | * this code relies on the client spinlock to manage locks, its | |
201 | * possible we should switch to something else, but I'd rather | |
202 | * stick with something low-overhead for the common case. | |
203 | * | |
204 | */ | |
205 | ||
51a87c55 | 206 | static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag) |
fea511a6 EVH |
207 | { |
208 | unsigned long flags; | |
209 | int row, col; | |
51a87c55 | 210 | struct p9_req_t *req; |
fea511a6 EVH |
211 | |
212 | /* This looks up the original request by tag so we know which | |
213 | * buffer to read the data into */ | |
214 | tag++; | |
215 | ||
216 | if (tag >= c->max_tag) { | |
217 | spin_lock_irqsave(&c->lock, flags); | |
218 | /* check again since original check was outside of lock */ | |
219 | while (tag >= c->max_tag) { | |
220 | row = (tag / P9_ROW_MAXTAG); | |
221 | c->reqs[row] = kcalloc(P9_ROW_MAXTAG, | |
222 | sizeof(struct p9_req_t), GFP_ATOMIC); | |
223 | ||
224 | if (!c->reqs[row]) { | |
225 | printk(KERN_ERR "Couldn't grow tag array\n"); | |
e45c5405 | 226 | spin_unlock_irqrestore(&c->lock, flags); |
51a87c55 | 227 | return ERR_PTR(-ENOMEM); |
fea511a6 EVH |
228 | } |
229 | for (col = 0; col < P9_ROW_MAXTAG; col++) { | |
230 | c->reqs[row][col].status = REQ_STATUS_IDLE; | |
51a87c55 | 231 | c->reqs[row][col].tc = NULL; |
fea511a6 EVH |
232 | } |
233 | c->max_tag += P9_ROW_MAXTAG; | |
234 | } | |
235 | spin_unlock_irqrestore(&c->lock, flags); | |
236 | } | |
237 | row = tag / P9_ROW_MAXTAG; | |
238 | col = tag % P9_ROW_MAXTAG; | |
239 | ||
51a87c55 EVH |
240 | req = &c->reqs[row][col]; |
241 | if (!req->tc) { | |
eeff66ef | 242 | req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS); |
51a87c55 EVH |
243 | if (!req->wq) { |
244 | printk(KERN_ERR "Couldn't grow tag array\n"); | |
245 | return ERR_PTR(-ENOMEM); | |
246 | } | |
247 | init_waitqueue_head(req->wq); | |
f735195d VJJ |
248 | if ((c->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == |
249 | P9_TRANS_PREF_PAYLOAD_SEP) { | |
250 | int alloc_msize = min(c->msize, 4096); | |
251 | req->tc = kmalloc(sizeof(struct p9_fcall)+alloc_msize, | |
eeff66ef | 252 | GFP_NOFS); |
f735195d VJJ |
253 | req->tc->capacity = alloc_msize; |
254 | req->rc = kmalloc(sizeof(struct p9_fcall)+alloc_msize, | |
eeff66ef | 255 | GFP_NOFS); |
f735195d VJJ |
256 | req->rc->capacity = alloc_msize; |
257 | } else { | |
258 | req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize, | |
eeff66ef | 259 | GFP_NOFS); |
f735195d VJJ |
260 | req->tc->capacity = c->msize; |
261 | req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize, | |
eeff66ef | 262 | GFP_NOFS); |
f735195d VJJ |
263 | req->rc->capacity = c->msize; |
264 | } | |
51a87c55 EVH |
265 | if ((!req->tc) || (!req->rc)) { |
266 | printk(KERN_ERR "Couldn't grow tag array\n"); | |
267 | kfree(req->tc); | |
268 | kfree(req->rc); | |
45abdf1c TT |
269 | kfree(req->wq); |
270 | req->tc = req->rc = NULL; | |
271 | req->wq = NULL; | |
51a87c55 EVH |
272 | return ERR_PTR(-ENOMEM); |
273 | } | |
274 | req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall); | |
51a87c55 | 275 | req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall); |
51a87c55 EVH |
276 | } |
277 | ||
278 | p9pdu_reset(req->tc); | |
279 | p9pdu_reset(req->rc); | |
280 | ||
51a87c55 EVH |
281 | req->tc->tag = tag-1; |
282 | req->status = REQ_STATUS_ALLOC; | |
fea511a6 EVH |
283 | |
284 | return &c->reqs[row][col]; | |
285 | } | |
fea511a6 EVH |
286 | |
287 | /** | |
288 | * p9_tag_lookup - lookup a request by tag | |
289 | * @c: client session to lookup tag within | |
290 | * @tag: numeric id for transaction | |
291 | * | |
292 | */ | |
293 | ||
294 | struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) | |
295 | { | |
296 | int row, col; | |
297 | ||
298 | /* This looks up the original request by tag so we know which | |
299 | * buffer to read the data into */ | |
300 | tag++; | |
301 | ||
b85f7d92 EVH |
302 | if(tag >= c->max_tag) |
303 | return NULL; | |
fea511a6 EVH |
304 | |
305 | row = tag / P9_ROW_MAXTAG; | |
306 | col = tag % P9_ROW_MAXTAG; | |
307 | ||
308 | return &c->reqs[row][col]; | |
309 | } | |
310 | EXPORT_SYMBOL(p9_tag_lookup); | |
311 | ||
312 | /** | |
313 | * p9_tag_init - setup tags structure and contents | |
0e15597e | 314 | * @c: v9fs client struct |
fea511a6 EVH |
315 | * |
316 | * This initializes the tags structure for each client instance. | |
317 | * | |
318 | */ | |
319 | ||
320 | static int p9_tag_init(struct p9_client *c) | |
321 | { | |
322 | int err = 0; | |
323 | ||
324 | c->tagpool = p9_idpool_create(); | |
325 | if (IS_ERR(c->tagpool)) { | |
326 | err = PTR_ERR(c->tagpool); | |
fea511a6 EVH |
327 | goto error; |
328 | } | |
fe1cbaba AK |
329 | err = p9_idpool_get(c->tagpool); /* reserve tag 0 */ |
330 | if (err < 0) { | |
331 | p9_idpool_destroy(c->tagpool); | |
332 | goto error; | |
333 | } | |
fea511a6 EVH |
334 | c->max_tag = 0; |
335 | error: | |
336 | return err; | |
337 | } | |
338 | ||
339 | /** | |
340 | * p9_tag_cleanup - cleans up tags structure and reclaims resources | |
0e15597e | 341 | * @c: v9fs client struct |
fea511a6 EVH |
342 | * |
343 | * This frees resources associated with the tags structure | |
344 | * | |
345 | */ | |
346 | static void p9_tag_cleanup(struct p9_client *c) | |
347 | { | |
348 | int row, col; | |
349 | ||
350 | /* check to insure all requests are idle */ | |
351 | for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { | |
352 | for (col = 0; col < P9_ROW_MAXTAG; col++) { | |
353 | if (c->reqs[row][col].status != REQ_STATUS_IDLE) { | |
354 | P9_DPRINTK(P9_DEBUG_MUX, | |
355 | "Attempting to cleanup non-free tag %d,%d\n", | |
356 | row, col); | |
357 | /* TODO: delay execution of cleanup */ | |
358 | return; | |
359 | } | |
360 | } | |
361 | } | |
362 | ||
62b2be59 LI |
363 | if (c->tagpool) { |
364 | p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */ | |
fea511a6 | 365 | p9_idpool_destroy(c->tagpool); |
62b2be59 | 366 | } |
fea511a6 EVH |
367 | |
368 | /* free requests associated with tags */ | |
369 | for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { | |
51a87c55 | 370 | for (col = 0; col < P9_ROW_MAXTAG; col++) { |
fea511a6 | 371 | kfree(c->reqs[row][col].wq); |
51a87c55 EVH |
372 | kfree(c->reqs[row][col].tc); |
373 | kfree(c->reqs[row][col].rc); | |
374 | } | |
fea511a6 EVH |
375 | kfree(c->reqs[row]); |
376 | } | |
377 | c->max_tag = 0; | |
378 | } | |
379 | ||
673d62cd EVH |
380 | /** |
381 | * p9_free_req - free a request and clean-up as necessary | |
382 | * c: client state | |
383 | * r: request to release | |
384 | * | |
385 | */ | |
386 | ||
51a87c55 | 387 | static void p9_free_req(struct p9_client *c, struct p9_req_t *r) |
673d62cd | 388 | { |
51a87c55 EVH |
389 | int tag = r->tc->tag; |
390 | P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); | |
391 | ||
673d62cd | 392 | r->status = REQ_STATUS_IDLE; |
51a87c55 EVH |
393 | if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) |
394 | p9_idpool_put(tag, c->tagpool); | |
673d62cd EVH |
395 | } |
396 | ||
91b8534f EVH |
397 | /** |
398 | * p9_client_cb - call back from transport to client | |
399 | * c: client state | |
400 | * req: request received | |
401 | * | |
402 | */ | |
403 | void p9_client_cb(struct p9_client *c, struct p9_req_t *req) | |
404 | { | |
51a87c55 | 405 | P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); |
1bab88b2 LI |
406 | wake_up(req->wq); |
407 | P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); | |
91b8534f EVH |
408 | } |
409 | EXPORT_SYMBOL(p9_client_cb); | |
410 | ||
51a87c55 EVH |
411 | /** |
412 | * p9_parse_header - parse header arguments out of a packet | |
413 | * @pdu: packet to parse | |
414 | * @size: size of packet | |
415 | * @type: type of request | |
416 | * @tag: tag of packet | |
417 | * @rewind: set if we need to rewind offset afterwards | |
418 | */ | |
419 | ||
420 | int | |
421 | p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, | |
422 | int rewind) | |
423 | { | |
424 | int8_t r_type; | |
425 | int16_t r_tag; | |
426 | int32_t r_size; | |
427 | int offset = pdu->offset; | |
428 | int err; | |
429 | ||
430 | pdu->offset = 0; | |
431 | if (pdu->size == 0) | |
432 | pdu->size = 7; | |
433 | ||
434 | err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); | |
435 | if (err) | |
436 | goto rewind_and_exit; | |
437 | ||
438 | pdu->size = r_size; | |
439 | pdu->id = r_type; | |
440 | pdu->tag = r_tag; | |
441 | ||
e7f4b8f1 EVH |
442 | P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size, |
443 | pdu->id, pdu->tag); | |
51a87c55 EVH |
444 | |
445 | if (type) | |
446 | *type = r_type; | |
447 | if (tag) | |
448 | *tag = r_tag; | |
449 | if (size) | |
450 | *size = r_size; | |
451 | ||
452 | ||
453 | rewind_and_exit: | |
454 | if (rewind) | |
455 | pdu->offset = offset; | |
456 | return err; | |
457 | } | |
458 | EXPORT_SYMBOL(p9_parse_header); | |
459 | ||
460 | /** | |
461 | * p9_check_errors - check 9p packet for error return and process it | |
462 | * @c: current client instance | |
463 | * @req: request to parse and check for error conditions | |
464 | * | |
465 | * returns error code if one is discovered, otherwise returns 0 | |
466 | * | |
467 | * this will have to be more complicated if we have multiple | |
468 | * error packet types | |
469 | */ | |
470 | ||
471 | static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) | |
472 | { | |
473 | int8_t type; | |
474 | int err; | |
ca41bb3e | 475 | int ecode; |
51a87c55 EVH |
476 | |
477 | err = p9_parse_header(req->rc, NULL, &type, NULL, 0); | |
478 | if (err) { | |
479 | P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); | |
480 | return err; | |
481 | } | |
482 | ||
ca41bb3e VJJ |
483 | if (type != P9_RERROR && type != P9_RLERROR) |
484 | return 0; | |
4f7ebe80 | 485 | |
ca41bb3e VJJ |
486 | if (!p9_is_proto_dotl(c)) { |
487 | char *ename; | |
488 | ||
489 | if (req->tc->pbuf_size) { | |
490 | /* Handle user buffers */ | |
491 | size_t len = req->rc->size - req->rc->offset; | |
492 | if (req->tc->pubuf) { | |
493 | /* User Buffer */ | |
494 | err = copy_from_user( | |
495 | &req->rc->sdata[req->rc->offset], | |
496 | req->tc->pubuf, len); | |
497 | if (err) { | |
498 | err = -EFAULT; | |
499 | goto out_err; | |
500 | } | |
501 | } else { | |
502 | /* Kernel Buffer */ | |
503 | memmove(&req->rc->sdata[req->rc->offset], | |
504 | req->tc->pkbuf, len); | |
505 | } | |
506 | } | |
507 | err = p9pdu_readf(req->rc, c->proto_version, "s?d", | |
508 | &ename, &ecode); | |
509 | if (err) | |
510 | goto out_err; | |
4f7ebe80 | 511 | |
ca41bb3e VJJ |
512 | if (p9_is_proto_dotu(c)) |
513 | err = -ecode; | |
4f7ebe80 | 514 | |
ca41bb3e VJJ |
515 | if (!err || !IS_ERR_VALUE(err)) { |
516 | err = p9_errstr2errno(ename, strlen(ename)); | |
4f7ebe80 | 517 | |
ca41bb3e VJJ |
518 | P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, |
519 | ename); | |
51a87c55 | 520 | |
ca41bb3e | 521 | kfree(ename); |
4f7ebe80 | 522 | } |
ca41bb3e VJJ |
523 | } else { |
524 | err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); | |
525 | err = -ecode; | |
526 | ||
527 | P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); | |
528 | } | |
51a87c55 | 529 | |
51a87c55 EVH |
530 | |
531 | return err; | |
4f7ebe80 AB |
532 | |
533 | out_err: | |
534 | P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); | |
535 | ||
536 | return err; | |
51a87c55 EVH |
537 | } |
538 | ||
aca00763 RL |
539 | static struct p9_req_t * |
540 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); | |
541 | ||
51a87c55 EVH |
542 | /** |
543 | * p9_client_flush - flush (cancel) a request | |
0e15597e AK |
544 | * @c: client state |
545 | * @oldreq: request to cancel | |
51a87c55 | 546 | * |
aca00763 | 547 | * This sents a flush for a particular request and links |
51a87c55 EVH |
548 | * the flush request to the original request. The current |
549 | * code only supports a single flush request although the protocol | |
550 | * allows for multiple flush requests to be sent for a single request. | |
551 | * | |
552 | */ | |
553 | ||
554 | static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) | |
555 | { | |
556 | struct p9_req_t *req; | |
557 | int16_t oldtag; | |
558 | int err; | |
559 | ||
560 | err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); | |
561 | if (err) | |
562 | return err; | |
563 | ||
564 | P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); | |
565 | ||
566 | req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); | |
567 | if (IS_ERR(req)) | |
568 | return PTR_ERR(req); | |
569 | ||
51a87c55 | 570 | |
1bab88b2 LI |
571 | /* if we haven't received a response for oldreq, |
572 | remove it from the list. */ | |
573 | spin_lock(&c->lock); | |
574 | if (oldreq->status == REQ_STATUS_FLSH) | |
575 | list_del(&oldreq->req_list); | |
576 | spin_unlock(&c->lock); | |
577 | ||
578 | p9_free_req(c, req); | |
51a87c55 EVH |
579 | return 0; |
580 | } | |
581 | ||
91b8534f EVH |
582 | /** |
583 | * p9_client_rpc - issue a request and wait for a response | |
584 | * @c: client session | |
51a87c55 EVH |
585 | * @type: type of request |
586 | * @fmt: protocol format string (see protocol.c) | |
91b8534f | 587 | * |
51a87c55 | 588 | * Returns request structure (which client must free using p9_free_req) |
91b8534f EVH |
589 | */ |
590 | ||
51a87c55 EVH |
591 | static struct p9_req_t * |
592 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) | |
91b8534f | 593 | { |
51a87c55 EVH |
594 | va_list ap; |
595 | int tag, err; | |
91b8534f EVH |
596 | struct p9_req_t *req; |
597 | unsigned long flags; | |
598 | int sigpending; | |
91b8534f | 599 | |
51a87c55 | 600 | P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type); |
91b8534f | 601 | |
6d96d3ab AK |
602 | /* we allow for any status other than disconnected */ |
603 | if (c->status == Disconnected) | |
604 | return ERR_PTR(-EIO); | |
605 | ||
606 | /* if status is begin_disconnected we allow only clunk request */ | |
607 | if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) | |
51a87c55 | 608 | return ERR_PTR(-EIO); |
91b8534f EVH |
609 | |
610 | if (signal_pending(current)) { | |
611 | sigpending = 1; | |
612 | clear_thread_flag(TIF_SIGPENDING); | |
613 | } else | |
614 | sigpending = 0; | |
615 | ||
616 | tag = P9_NOTAG; | |
51a87c55 | 617 | if (type != P9_TVERSION) { |
91b8534f EVH |
618 | tag = p9_idpool_get(c->tagpool); |
619 | if (tag < 0) | |
51a87c55 | 620 | return ERR_PTR(-ENOMEM); |
91b8534f EVH |
621 | } |
622 | ||
623 | req = p9_tag_alloc(c, tag); | |
51a87c55 EVH |
624 | if (IS_ERR(req)) |
625 | return req; | |
91b8534f | 626 | |
51a87c55 EVH |
627 | /* marshall the data */ |
628 | p9pdu_prepare(req->tc, tag, type); | |
629 | va_start(ap, fmt); | |
342fee1d | 630 | err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); |
51a87c55 | 631 | va_end(ap); |
7b3bb3fe AK |
632 | if (err) |
633 | goto reterr; | |
51a87c55 | 634 | p9pdu_finalize(req->tc); |
91b8534f EVH |
635 | |
636 | err = c->trans_mod->request(c, req); | |
637 | if (err < 0) { | |
3cd79678 | 638 | if (err != -ERESTARTSYS && err != -EFAULT) |
52f44e0d | 639 | c->status = Disconnected; |
91b8534f EVH |
640 | goto reterr; |
641 | } | |
642 | ||
51a87c55 | 643 | P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag); |
91b8534f EVH |
644 | err = wait_event_interruptible(*req->wq, |
645 | req->status >= REQ_STATUS_RCVD); | |
1bab88b2 LI |
646 | P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n", |
647 | req->wq, tag, err); | |
91b8534f EVH |
648 | |
649 | if (req->status == REQ_STATUS_ERROR) { | |
51a87c55 | 650 | P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
91b8534f | 651 | err = req->t_err; |
91b8534f EVH |
652 | } |
653 | ||
1bab88b2 | 654 | if ((err == -ERESTARTSYS) && (c->status == Connected)) { |
51a87c55 | 655 | P9_DPRINTK(P9_DEBUG_MUX, "flushing\n"); |
91b8534f | 656 | sigpending = 1; |
91b8534f EVH |
657 | clear_thread_flag(TIF_SIGPENDING); |
658 | ||
1bab88b2 LI |
659 | if (c->trans_mod->cancel(c, req)) |
660 | p9_client_flush(c, req); | |
661 | ||
662 | /* if we received the response anyway, don't signal error */ | |
663 | if (req->status == REQ_STATUS_RCVD) | |
664 | err = 0; | |
91b8534f EVH |
665 | } |
666 | ||
667 | if (sigpending) { | |
668 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
669 | recalc_sigpending(); | |
670 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
671 | } | |
672 | ||
673 | if (err < 0) | |
674 | goto reterr; | |
675 | ||
51a87c55 EVH |
676 | err = p9_check_errors(c, req); |
677 | if (!err) { | |
678 | P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type); | |
679 | return req; | |
91b8534f EVH |
680 | } |
681 | ||
91b8534f | 682 | reterr: |
51a87c55 EVH |
683 | P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type, |
684 | err); | |
91b8534f | 685 | p9_free_req(c, req); |
51a87c55 | 686 | return ERR_PTR(err); |
91b8534f EVH |
687 | } |
688 | ||
5503ac56 EVH |
689 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) |
690 | { | |
9f3e9bbe | 691 | int ret; |
5503ac56 | 692 | struct p9_fid *fid; |
cac23d65 | 693 | unsigned long flags; |
5503ac56 | 694 | |
51a87c55 | 695 | P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt); |
5503ac56 EVH |
696 | fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); |
697 | if (!fid) | |
698 | return ERR_PTR(-ENOMEM); | |
699 | ||
9f3e9bbe | 700 | ret = p9_idpool_get(clnt->fidpool); |
24e94de4 | 701 | if (ret < 0) { |
9f3e9bbe | 702 | ret = -ENOSPC; |
5503ac56 EVH |
703 | goto error; |
704 | } | |
9f3e9bbe | 705 | fid->fid = ret; |
5503ac56 EVH |
706 | |
707 | memset(&fid->qid, 0, sizeof(struct p9_qid)); | |
708 | fid->mode = -1; | |
f8b9d53a | 709 | fid->uid = current_fsuid(); |
5503ac56 | 710 | fid->clnt = clnt; |
3e2796a9 | 711 | fid->rdir = NULL; |
cac23d65 | 712 | spin_lock_irqsave(&clnt->lock, flags); |
5503ac56 | 713 | list_add(&fid->flist, &clnt->fidlist); |
cac23d65 | 714 | spin_unlock_irqrestore(&clnt->lock, flags); |
5503ac56 EVH |
715 | |
716 | return fid; | |
717 | ||
718 | error: | |
719 | kfree(fid); | |
9f3e9bbe | 720 | return ERR_PTR(ret); |
5503ac56 EVH |
721 | } |
722 | ||
723 | static void p9_fid_destroy(struct p9_fid *fid) | |
724 | { | |
725 | struct p9_client *clnt; | |
cac23d65 | 726 | unsigned long flags; |
5503ac56 | 727 | |
51a87c55 | 728 | P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid); |
5503ac56 EVH |
729 | clnt = fid->clnt; |
730 | p9_idpool_put(fid->fid, clnt->fidpool); | |
cac23d65 | 731 | spin_lock_irqsave(&clnt->lock, flags); |
5503ac56 | 732 | list_del(&fid->flist); |
cac23d65 | 733 | spin_unlock_irqrestore(&clnt->lock, flags); |
3e2796a9 | 734 | kfree(fid->rdir); |
5503ac56 EVH |
735 | kfree(fid); |
736 | } | |
8a0dc95f | 737 | |
32a875ad | 738 | static int p9_client_version(struct p9_client *c) |
bd238fb4 | 739 | { |
6936bf60 | 740 | int err = 0; |
51a87c55 EVH |
741 | struct p9_req_t *req; |
742 | char *version; | |
743 | int msize; | |
bd238fb4 | 744 | |
342fee1d SK |
745 | P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", |
746 | c->msize, c->proto_version); | |
c5a7697d SK |
747 | |
748 | switch (c->proto_version) { | |
45bc21ed | 749 | case p9_proto_2000L: |
c5a7697d | 750 | req = p9_client_rpc(c, P9_TVERSION, "ds", |
45bc21ed | 751 | c->msize, "9P2000.L"); |
c5a7697d SK |
752 | break; |
753 | case p9_proto_2000u: | |
754 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
755 | c->msize, "9P2000.u"); | |
756 | break; | |
757 | case p9_proto_legacy: | |
758 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
759 | c->msize, "9P2000"); | |
760 | break; | |
761 | default: | |
762 | return -EINVAL; | |
763 | break; | |
764 | } | |
765 | ||
51a87c55 EVH |
766 | if (IS_ERR(req)) |
767 | return PTR_ERR(req); | |
6936bf60 | 768 | |
342fee1d | 769 | err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); |
51a87c55 EVH |
770 | if (err) { |
771 | P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err); | |
e660a828 | 772 | P9_DUMP_PKT(1, req->rc); |
6936bf60 | 773 | goto error; |
51a87c55 | 774 | } |
6936bf60 | 775 | |
51a87c55 | 776 | P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); |
45bc21ed SK |
777 | if (!strncmp(version, "9P2000.L", 8)) |
778 | c->proto_version = p9_proto_2000L; | |
c5a7697d | 779 | else if (!strncmp(version, "9P2000.u", 8)) |
342fee1d SK |
780 | c->proto_version = p9_proto_2000u; |
781 | else if (!strncmp(version, "9P2000", 6)) | |
782 | c->proto_version = p9_proto_legacy; | |
6936bf60 EVH |
783 | else { |
784 | err = -EREMOTEIO; | |
785 | goto error; | |
786 | } | |
787 | ||
51a87c55 EVH |
788 | if (msize < c->msize) |
789 | c->msize = msize; | |
6936bf60 EVH |
790 | |
791 | error: | |
51a87c55 EVH |
792 | kfree(version); |
793 | p9_free_req(c, req); | |
6936bf60 EVH |
794 | |
795 | return err; | |
796 | } | |
6936bf60 EVH |
797 | |
798 | struct p9_client *p9_client_create(const char *dev_name, char *options) | |
799 | { | |
800 | int err; | |
801 | struct p9_client *clnt; | |
802 | ||
803 | err = 0; | |
bd238fb4 LI |
804 | clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); |
805 | if (!clnt) | |
806 | return ERR_PTR(-ENOMEM); | |
807 | ||
72029fe8 | 808 | clnt->trans_mod = NULL; |
bb8ffdfc | 809 | clnt->trans = NULL; |
bd238fb4 | 810 | spin_lock_init(&clnt->lock); |
bd238fb4 | 811 | INIT_LIST_HEAD(&clnt->fidlist); |
bd238fb4 | 812 | |
fe1cbaba AK |
813 | err = p9_tag_init(clnt); |
814 | if (err < 0) | |
815 | goto free_client; | |
fea511a6 | 816 | |
bb8ffdfc EVH |
817 | err = parse_opts(options, clnt); |
818 | if (err < 0) | |
fe1cbaba | 819 | goto destroy_tagpool; |
bb8ffdfc | 820 | |
a17d1720 AK |
821 | if (!clnt->trans_mod) |
822 | clnt->trans_mod = v9fs_get_default_trans(); | |
823 | ||
8a0dc95f EVH |
824 | if (clnt->trans_mod == NULL) { |
825 | err = -EPROTONOSUPPORT; | |
826 | P9_DPRINTK(P9_DEBUG_ERROR, | |
827 | "No transport defined or default transport\n"); | |
fe1cbaba | 828 | goto destroy_tagpool; |
8781ff94 EVH |
829 | } |
830 | ||
831 | clnt->fidpool = p9_idpool_create(); | |
832 | if (IS_ERR(clnt->fidpool)) { | |
833 | err = PTR_ERR(clnt->fidpool); | |
8781ff94 | 834 | goto put_trans; |
8a0dc95f EVH |
835 | } |
836 | ||
342fee1d SK |
837 | P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", |
838 | clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); | |
8a0dc95f | 839 | |
8b81ef58 EVH |
840 | err = clnt->trans_mod->create(clnt, dev_name, options); |
841 | if (err) | |
8781ff94 | 842 | goto destroy_fidpool; |
bd238fb4 | 843 | |
8a0dc95f EVH |
844 | if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) |
845 | clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; | |
846 | ||
6936bf60 | 847 | err = p9_client_version(clnt); |
bd238fb4 | 848 | if (err) |
8781ff94 | 849 | goto close_trans; |
bd238fb4 | 850 | |
bd238fb4 LI |
851 | return clnt; |
852 | ||
8781ff94 EVH |
853 | close_trans: |
854 | clnt->trans_mod->close(clnt); | |
855 | destroy_fidpool: | |
856 | p9_idpool_destroy(clnt->fidpool); | |
857 | put_trans: | |
858 | v9fs_put_trans(clnt->trans_mod); | |
fe1cbaba AK |
859 | destroy_tagpool: |
860 | p9_idpool_destroy(clnt->tagpool); | |
8781ff94 EVH |
861 | free_client: |
862 | kfree(clnt); | |
bd238fb4 LI |
863 | return ERR_PTR(err); |
864 | } | |
865 | EXPORT_SYMBOL(p9_client_create); | |
866 | ||
867 | void p9_client_destroy(struct p9_client *clnt) | |
868 | { | |
869 | struct p9_fid *fid, *fidptr; | |
870 | ||
51a87c55 | 871 | P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt); |
bd238fb4 | 872 | |
8b81ef58 EVH |
873 | if (clnt->trans_mod) |
874 | clnt->trans_mod->close(clnt); | |
bd238fb4 | 875 | |
72029fe8 TH |
876 | v9fs_put_trans(clnt->trans_mod); |
877 | ||
6d96d3ab AK |
878 | list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { |
879 | printk(KERN_INFO "Found fid %d not clunked\n", fid->fid); | |
bd238fb4 | 880 | p9_fid_destroy(fid); |
6d96d3ab | 881 | } |
bd238fb4 | 882 | |
0af8887e EVH |
883 | if (clnt->fidpool) |
884 | p9_idpool_destroy(clnt->fidpool); | |
885 | ||
fea511a6 EVH |
886 | p9_tag_cleanup(clnt); |
887 | ||
bd238fb4 LI |
888 | kfree(clnt); |
889 | } | |
890 | EXPORT_SYMBOL(p9_client_destroy); | |
891 | ||
892 | void p9_client_disconnect(struct p9_client *clnt) | |
893 | { | |
894 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
8b81ef58 | 895 | clnt->status = Disconnected; |
bd238fb4 LI |
896 | } |
897 | EXPORT_SYMBOL(p9_client_disconnect); | |
898 | ||
6d96d3ab AK |
899 | void p9_client_begin_disconnect(struct p9_client *clnt) |
900 | { | |
901 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
902 | clnt->status = BeginDisconnect; | |
903 | } | |
904 | EXPORT_SYMBOL(p9_client_begin_disconnect); | |
905 | ||
bd238fb4 | 906 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, |
ba17674f | 907 | char *uname, u32 n_uname, char *aname) |
bd238fb4 LI |
908 | { |
909 | int err; | |
51a87c55 | 910 | struct p9_req_t *req; |
bd238fb4 | 911 | struct p9_fid *fid; |
51a87c55 | 912 | struct p9_qid qid; |
bd238fb4 | 913 | |
51a87c55 EVH |
914 | P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", |
915 | afid ? afid->fid : -1, uname, aname); | |
bd238fb4 | 916 | err = 0; |
bd238fb4 LI |
917 | |
918 | fid = p9_fid_create(clnt); | |
919 | if (IS_ERR(fid)) { | |
920 | err = PTR_ERR(fid); | |
921 | fid = NULL; | |
922 | goto error; | |
923 | } | |
924 | ||
51a87c55 EVH |
925 | req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, |
926 | afid ? afid->fid : P9_NOFID, uname, aname, n_uname); | |
927 | if (IS_ERR(req)) { | |
928 | err = PTR_ERR(req); | |
bd238fb4 LI |
929 | goto error; |
930 | } | |
931 | ||
342fee1d | 932 | err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); |
51a87c55 | 933 | if (err) { |
e660a828 | 934 | P9_DUMP_PKT(1, req->rc); |
51a87c55 | 935 | p9_free_req(clnt, req); |
bd238fb4 | 936 | goto error; |
51a87c55 | 937 | } |
bd238fb4 | 938 | |
51a87c55 | 939 | P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", |
b0d5fdef RD |
940 | qid.type, |
941 | (unsigned long long)qid.path, | |
942 | qid.version); | |
51a87c55 EVH |
943 | |
944 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); | |
945 | ||
946 | p9_free_req(clnt, req); | |
bd238fb4 LI |
947 | return fid; |
948 | ||
949 | error: | |
bd238fb4 LI |
950 | if (fid) |
951 | p9_fid_destroy(fid); | |
952 | return ERR_PTR(err); | |
953 | } | |
954 | EXPORT_SYMBOL(p9_client_attach); | |
955 | ||
b76225e2 HPB |
956 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, |
957 | char **wnames, int clone) | |
bd238fb4 LI |
958 | { |
959 | int err; | |
bd238fb4 LI |
960 | struct p9_client *clnt; |
961 | struct p9_fid *fid; | |
51a87c55 EVH |
962 | struct p9_qid *wqids; |
963 | struct p9_req_t *req; | |
b76225e2 | 964 | uint16_t nwqids, count; |
bd238fb4 | 965 | |
bd238fb4 | 966 | err = 0; |
62b2be59 | 967 | wqids = NULL; |
bd238fb4 LI |
968 | clnt = oldfid->clnt; |
969 | if (clone) { | |
970 | fid = p9_fid_create(clnt); | |
971 | if (IS_ERR(fid)) { | |
972 | err = PTR_ERR(fid); | |
973 | fid = NULL; | |
974 | goto error; | |
975 | } | |
976 | ||
977 | fid->uid = oldfid->uid; | |
978 | } else | |
979 | fid = oldfid; | |
980 | ||
51a87c55 | 981 | |
b76225e2 | 982 | P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", |
51a87c55 EVH |
983 | oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); |
984 | ||
985 | req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, | |
986 | nwname, wnames); | |
987 | if (IS_ERR(req)) { | |
988 | err = PTR_ERR(req); | |
bd238fb4 LI |
989 | goto error; |
990 | } | |
991 | ||
342fee1d | 992 | err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); |
e7f4b8f1 | 993 | if (err) { |
e660a828 | 994 | P9_DUMP_PKT(1, req->rc); |
e7f4b8f1 | 995 | p9_free_req(clnt, req); |
51a87c55 | 996 | goto clunk_fid; |
e7f4b8f1 EVH |
997 | } |
998 | p9_free_req(clnt, req); | |
bd238fb4 | 999 | |
51a87c55 EVH |
1000 | P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); |
1001 | ||
1002 | if (nwqids != nwname) { | |
bd238fb4 LI |
1003 | err = -ENOENT; |
1004 | goto clunk_fid; | |
1005 | } | |
1006 | ||
51a87c55 EVH |
1007 | for (count = 0; count < nwqids; count++) |
1008 | P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", | |
b0d5fdef RD |
1009 | count, wqids[count].type, |
1010 | (unsigned long long)wqids[count].path, | |
51a87c55 EVH |
1011 | wqids[count].version); |
1012 | ||
bd238fb4 | 1013 | if (nwname) |
51a87c55 | 1014 | memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); |
bd238fb4 LI |
1015 | else |
1016 | fid->qid = oldfid->qid; | |
1017 | ||
62b2be59 | 1018 | kfree(wqids); |
bd238fb4 LI |
1019 | return fid; |
1020 | ||
1021 | clunk_fid: | |
62b2be59 | 1022 | kfree(wqids); |
51a87c55 EVH |
1023 | p9_client_clunk(fid); |
1024 | fid = NULL; | |
bd238fb4 LI |
1025 | |
1026 | error: | |
bd238fb4 LI |
1027 | if (fid && (fid != oldfid)) |
1028 | p9_fid_destroy(fid); | |
1029 | ||
1030 | return ERR_PTR(err); | |
1031 | } | |
1032 | EXPORT_SYMBOL(p9_client_walk); | |
1033 | ||
1034 | int p9_client_open(struct p9_fid *fid, int mode) | |
1035 | { | |
1036 | int err; | |
bd238fb4 | 1037 | struct p9_client *clnt; |
51a87c55 EVH |
1038 | struct p9_req_t *req; |
1039 | struct p9_qid qid; | |
1040 | int iounit; | |
bd238fb4 | 1041 | |
bd238fb4 | 1042 | clnt = fid->clnt; |
ef56547e MK |
1043 | P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", |
1044 | p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); | |
1045 | err = 0; | |
bd238fb4 LI |
1046 | |
1047 | if (fid->mode != -1) | |
1048 | return -EINVAL; | |
1049 | ||
ef56547e MK |
1050 | if (p9_is_proto_dotl(clnt)) |
1051 | req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); | |
1052 | else | |
1053 | req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); | |
51a87c55 EVH |
1054 | if (IS_ERR(req)) { |
1055 | err = PTR_ERR(req); | |
1056 | goto error; | |
bd238fb4 LI |
1057 | } |
1058 | ||
342fee1d | 1059 | err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); |
e7f4b8f1 | 1060 | if (err) { |
e660a828 | 1061 | P9_DUMP_PKT(1, req->rc); |
e7f4b8f1 EVH |
1062 | goto free_and_error; |
1063 | } | |
51a87c55 | 1064 | |
ef56547e MK |
1065 | P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", |
1066 | p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, | |
1067 | (unsigned long long)qid.path, qid.version, iounit); | |
bd238fb4 LI |
1068 | |
1069 | fid->mode = mode; | |
51a87c55 | 1070 | fid->iounit = iounit; |
bd238fb4 | 1071 | |
e7f4b8f1 EVH |
1072 | free_and_error: |
1073 | p9_free_req(clnt, req); | |
51a87c55 | 1074 | error: |
bd238fb4 LI |
1075 | return err; |
1076 | } | |
1077 | EXPORT_SYMBOL(p9_client_open); | |
1078 | ||
5643135a VJJ |
1079 | int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode, |
1080 | gid_t gid, struct p9_qid *qid) | |
1081 | { | |
1082 | int err = 0; | |
1083 | struct p9_client *clnt; | |
1084 | struct p9_req_t *req; | |
1085 | int iounit; | |
1086 | ||
1087 | P9_DPRINTK(P9_DEBUG_9P, | |
1088 | ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", | |
1089 | ofid->fid, name, flags, mode, gid); | |
1090 | clnt = ofid->clnt; | |
1091 | ||
1092 | if (ofid->mode != -1) | |
1093 | return -EINVAL; | |
1094 | ||
1095 | req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags, | |
1096 | mode, gid); | |
1097 | if (IS_ERR(req)) { | |
1098 | err = PTR_ERR(req); | |
1099 | goto error; | |
1100 | } | |
1101 | ||
1102 | err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); | |
1103 | if (err) { | |
e660a828 | 1104 | P9_DUMP_PKT(1, req->rc); |
5643135a VJJ |
1105 | goto free_and_error; |
1106 | } | |
1107 | ||
1108 | P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", | |
1109 | qid->type, | |
1110 | (unsigned long long)qid->path, | |
1111 | qid->version, iounit); | |
1112 | ||
1113 | ofid->mode = mode; | |
1114 | ofid->iounit = iounit; | |
1115 | ||
1116 | free_and_error: | |
1117 | p9_free_req(clnt, req); | |
1118 | error: | |
1119 | return err; | |
1120 | } | |
1121 | EXPORT_SYMBOL(p9_client_create_dotl); | |
1122 | ||
bd238fb4 LI |
1123 | int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, |
1124 | char *extension) | |
1125 | { | |
1126 | int err; | |
bd238fb4 | 1127 | struct p9_client *clnt; |
51a87c55 EVH |
1128 | struct p9_req_t *req; |
1129 | struct p9_qid qid; | |
1130 | int iounit; | |
bd238fb4 | 1131 | |
51a87c55 EVH |
1132 | P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", |
1133 | fid->fid, name, perm, mode); | |
bd238fb4 | 1134 | err = 0; |
bd238fb4 LI |
1135 | clnt = fid->clnt; |
1136 | ||
1137 | if (fid->mode != -1) | |
1138 | return -EINVAL; | |
1139 | ||
51a87c55 EVH |
1140 | req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, |
1141 | mode, extension); | |
1142 | if (IS_ERR(req)) { | |
1143 | err = PTR_ERR(req); | |
1144 | goto error; | |
bd238fb4 LI |
1145 | } |
1146 | ||
342fee1d | 1147 | err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); |
e7f4b8f1 | 1148 | if (err) { |
e660a828 | 1149 | P9_DUMP_PKT(1, req->rc); |
e7f4b8f1 EVH |
1150 | goto free_and_error; |
1151 | } | |
51a87c55 EVH |
1152 | |
1153 | P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", | |
b0d5fdef RD |
1154 | qid.type, |
1155 | (unsigned long long)qid.path, | |
1156 | qid.version, iounit); | |
bd238fb4 LI |
1157 | |
1158 | fid->mode = mode; | |
51a87c55 | 1159 | fid->iounit = iounit; |
bd238fb4 | 1160 | |
e7f4b8f1 EVH |
1161 | free_and_error: |
1162 | p9_free_req(clnt, req); | |
51a87c55 | 1163 | error: |
bd238fb4 LI |
1164 | return err; |
1165 | } | |
1166 | EXPORT_SYMBOL(p9_client_fcreate); | |
1167 | ||
50cc42ff VJJ |
1168 | int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid, |
1169 | struct p9_qid *qid) | |
1170 | { | |
1171 | int err = 0; | |
1172 | struct p9_client *clnt; | |
1173 | struct p9_req_t *req; | |
1174 | ||
1175 | P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", | |
1176 | dfid->fid, name, symtgt); | |
1177 | clnt = dfid->clnt; | |
1178 | ||
1179 | req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt, | |
1180 | gid); | |
1181 | if (IS_ERR(req)) { | |
1182 | err = PTR_ERR(req); | |
1183 | goto error; | |
1184 | } | |
1185 | ||
1186 | err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); | |
1187 | if (err) { | |
e660a828 | 1188 | P9_DUMP_PKT(1, req->rc); |
50cc42ff VJJ |
1189 | goto free_and_error; |
1190 | } | |
1191 | ||
1192 | P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", | |
1193 | qid->type, (unsigned long long)qid->path, qid->version); | |
1194 | ||
1195 | free_and_error: | |
1196 | p9_free_req(clnt, req); | |
1197 | error: | |
1198 | return err; | |
1199 | } | |
1200 | EXPORT_SYMBOL(p9_client_symlink); | |
1201 | ||
652df9a7 VJJ |
1202 | int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname) |
1203 | { | |
1204 | struct p9_client *clnt; | |
1205 | struct p9_req_t *req; | |
1206 | ||
1207 | P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", | |
1208 | dfid->fid, oldfid->fid, newname); | |
1209 | clnt = dfid->clnt; | |
1210 | req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, | |
1211 | newname); | |
1212 | if (IS_ERR(req)) | |
1213 | return PTR_ERR(req); | |
1214 | ||
1215 | P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n"); | |
1216 | p9_free_req(clnt, req); | |
1217 | return 0; | |
1218 | } | |
1219 | EXPORT_SYMBOL(p9_client_link); | |
1220 | ||
b165d601 | 1221 | int p9_client_fsync(struct p9_fid *fid, int datasync) |
920e65dc VJJ |
1222 | { |
1223 | int err; | |
1224 | struct p9_client *clnt; | |
1225 | struct p9_req_t *req; | |
1226 | ||
b165d601 VJJ |
1227 | P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", |
1228 | fid->fid, datasync); | |
920e65dc VJJ |
1229 | err = 0; |
1230 | clnt = fid->clnt; | |
1231 | ||
b165d601 | 1232 | req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); |
920e65dc VJJ |
1233 | if (IS_ERR(req)) { |
1234 | err = PTR_ERR(req); | |
1235 | goto error; | |
1236 | } | |
1237 | ||
1238 | P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); | |
1239 | ||
1240 | p9_free_req(clnt, req); | |
1241 | ||
1242 | error: | |
1243 | return err; | |
1244 | } | |
1245 | EXPORT_SYMBOL(p9_client_fsync); | |
1246 | ||
bd238fb4 LI |
1247 | int p9_client_clunk(struct p9_fid *fid) |
1248 | { | |
1249 | int err; | |
bd238fb4 | 1250 | struct p9_client *clnt; |
51a87c55 | 1251 | struct p9_req_t *req; |
bd238fb4 | 1252 | |
8e44a080 | 1253 | if (!fid) { |
1254 | P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n"); | |
1255 | dump_stack(); | |
1256 | return 0; | |
1257 | } | |
1258 | ||
51a87c55 | 1259 | P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid); |
bd238fb4 | 1260 | err = 0; |
bd238fb4 LI |
1261 | clnt = fid->clnt; |
1262 | ||
51a87c55 EVH |
1263 | req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); |
1264 | if (IS_ERR(req)) { | |
1265 | err = PTR_ERR(req); | |
1266 | goto error; | |
bd238fb4 LI |
1267 | } |
1268 | ||
51a87c55 | 1269 | P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); |
bd238fb4 | 1270 | |
51a87c55 | 1271 | p9_free_req(clnt, req); |
51a87c55 | 1272 | error: |
5034990e AK |
1273 | /* |
1274 | * Fid is not valid even after a failed clunk | |
1275 | */ | |
1276 | p9_fid_destroy(fid); | |
bd238fb4 LI |
1277 | return err; |
1278 | } | |
1279 | EXPORT_SYMBOL(p9_client_clunk); | |
1280 | ||
1281 | int p9_client_remove(struct p9_fid *fid) | |
1282 | { | |
1283 | int err; | |
bd238fb4 | 1284 | struct p9_client *clnt; |
51a87c55 | 1285 | struct p9_req_t *req; |
bd238fb4 | 1286 | |
51a87c55 | 1287 | P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); |
bd238fb4 | 1288 | err = 0; |
bd238fb4 LI |
1289 | clnt = fid->clnt; |
1290 | ||
51a87c55 EVH |
1291 | req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); |
1292 | if (IS_ERR(req)) { | |
1293 | err = PTR_ERR(req); | |
1294 | goto error; | |
bd238fb4 LI |
1295 | } |
1296 | ||
51a87c55 | 1297 | P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); |
bd238fb4 | 1298 | |
51a87c55 | 1299 | p9_free_req(clnt, req); |
51a87c55 | 1300 | error: |
0b1208b1 | 1301 | p9_fid_destroy(fid); |
bd238fb4 LI |
1302 | return err; |
1303 | } | |
1304 | EXPORT_SYMBOL(p9_client_remove); | |
1305 | ||
0fc9655e EVH |
1306 | int |
1307 | p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, | |
1308 | u32 count) | |
bd238fb4 | 1309 | { |
095d3da6 | 1310 | int err, rsize; |
bd238fb4 | 1311 | struct p9_client *clnt; |
51a87c55 EVH |
1312 | struct p9_req_t *req; |
1313 | char *dataptr; | |
bd238fb4 | 1314 | |
51a87c55 | 1315 | P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid, |
bd238fb4 LI |
1316 | (long long unsigned) offset, count); |
1317 | err = 0; | |
bd238fb4 | 1318 | clnt = fid->clnt; |
bd238fb4 LI |
1319 | |
1320 | rsize = fid->iounit; | |
1321 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1322 | rsize = clnt->msize - P9_IOHDRSZ; | |
1323 | ||
51a87c55 EVH |
1324 | if (count < rsize) |
1325 | rsize = count; | |
bd238fb4 | 1326 | |
aca00763 | 1327 | /* Don't bother zerocopy for small IO (< 1024) */ |
bb2f8a55 VJJ |
1328 | if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == |
1329 | P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) { | |
1330 | req = p9_client_rpc(clnt, P9_TREAD, "dqE", fid->fid, offset, | |
1331 | rsize, data, udata); | |
1332 | } else { | |
1333 | req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, | |
1334 | rsize); | |
1335 | } | |
51a87c55 EVH |
1336 | if (IS_ERR(req)) { |
1337 | err = PTR_ERR(req); | |
1338 | goto error; | |
1339 | } | |
bd238fb4 | 1340 | |
342fee1d | 1341 | err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); |
e7f4b8f1 | 1342 | if (err) { |
e660a828 | 1343 | P9_DUMP_PKT(1, req->rc); |
51a87c55 | 1344 | goto free_and_error; |
e7f4b8f1 | 1345 | } |
bd238fb4 | 1346 | |
51a87c55 | 1347 | P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count); |
e660a828 | 1348 | P9_DUMP_PKT(1, req->rc); |
bd238fb4 | 1349 | |
bb2f8a55 VJJ |
1350 | if (!req->tc->pbuf_size) { |
1351 | if (data) { | |
1352 | memmove(data, dataptr, count); | |
1353 | } else { | |
1354 | err = copy_to_user(udata, dataptr, count); | |
1355 | if (err) { | |
1356 | err = -EFAULT; | |
1357 | goto free_and_error; | |
1358 | } | |
bd238fb4 | 1359 | } |
51a87c55 | 1360 | } |
51a87c55 EVH |
1361 | p9_free_req(clnt, req); |
1362 | return count; | |
bd238fb4 | 1363 | |
51a87c55 EVH |
1364 | free_and_error: |
1365 | p9_free_req(clnt, req); | |
bd238fb4 | 1366 | error: |
bd238fb4 LI |
1367 | return err; |
1368 | } | |
0fc9655e | 1369 | EXPORT_SYMBOL(p9_client_read); |
bd238fb4 LI |
1370 | |
1371 | int | |
0fc9655e EVH |
1372 | p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, |
1373 | u64 offset, u32 count) | |
bd238fb4 | 1374 | { |
095d3da6 | 1375 | int err, rsize; |
bd238fb4 | 1376 | struct p9_client *clnt; |
51a87c55 | 1377 | struct p9_req_t *req; |
bd238fb4 | 1378 | |
51a87c55 EVH |
1379 | P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", |
1380 | fid->fid, (long long unsigned) offset, count); | |
bd238fb4 | 1381 | err = 0; |
bd238fb4 | 1382 | clnt = fid->clnt; |
bd238fb4 LI |
1383 | |
1384 | rsize = fid->iounit; | |
1385 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1386 | rsize = clnt->msize - P9_IOHDRSZ; | |
1387 | ||
51a87c55 EVH |
1388 | if (count < rsize) |
1389 | rsize = count; | |
1fc52481 VJJ |
1390 | |
1391 | /* Don't bother zerocopy form small IO (< 1024) */ | |
1392 | if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == | |
1393 | P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) { | |
1394 | req = p9_client_rpc(clnt, P9_TWRITE, "dqE", fid->fid, offset, | |
1395 | rsize, data, udata); | |
1396 | } else { | |
1397 | ||
1398 | if (data) | |
1399 | req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, | |
1400 | offset, rsize, data); | |
1401 | else | |
1402 | req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, | |
1403 | offset, rsize, udata); | |
1404 | } | |
51a87c55 EVH |
1405 | if (IS_ERR(req)) { |
1406 | err = PTR_ERR(req); | |
1407 | goto error; | |
1408 | } | |
0fc9655e | 1409 | |
342fee1d | 1410 | err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); |
e7f4b8f1 | 1411 | if (err) { |
e660a828 | 1412 | P9_DUMP_PKT(1, req->rc); |
51a87c55 | 1413 | goto free_and_error; |
e7f4b8f1 EVH |
1414 | } |
1415 | ||
51a87c55 | 1416 | P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); |
bd238fb4 | 1417 | |
51a87c55 EVH |
1418 | p9_free_req(clnt, req); |
1419 | return count; | |
bd238fb4 | 1420 | |
51a87c55 EVH |
1421 | free_and_error: |
1422 | p9_free_req(clnt, req); | |
bd238fb4 | 1423 | error: |
bd238fb4 LI |
1424 | return err; |
1425 | } | |
0fc9655e | 1426 | EXPORT_SYMBOL(p9_client_write); |
bd238fb4 | 1427 | |
51a87c55 | 1428 | struct p9_wstat *p9_client_stat(struct p9_fid *fid) |
5503ac56 | 1429 | { |
51a87c55 EVH |
1430 | int err; |
1431 | struct p9_client *clnt; | |
1432 | struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); | |
1433 | struct p9_req_t *req; | |
1434 | u16 ignored; | |
5503ac56 | 1435 | |
51a87c55 | 1436 | P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); |
5503ac56 | 1437 | |
5503ac56 EVH |
1438 | if (!ret) |
1439 | return ERR_PTR(-ENOMEM); | |
1440 | ||
bd238fb4 | 1441 | err = 0; |
bd238fb4 LI |
1442 | clnt = fid->clnt; |
1443 | ||
51a87c55 EVH |
1444 | req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); |
1445 | if (IS_ERR(req)) { | |
1446 | err = PTR_ERR(req); | |
bd238fb4 LI |
1447 | goto error; |
1448 | } | |
1449 | ||
342fee1d | 1450 | err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); |
e7f4b8f1 | 1451 | if (err) { |
e660a828 | 1452 | P9_DUMP_PKT(1, req->rc); |
eedfe1c4 AK |
1453 | p9_free_req(clnt, req); |
1454 | goto error; | |
e7f4b8f1 | 1455 | } |
bd238fb4 | 1456 | |
51a87c55 | 1457 | P9_DPRINTK(P9_DEBUG_9P, |
e7f4b8f1 EVH |
1458 | "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
1459 | "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1460 | "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1461 | "<<< uid=%d gid=%d n_muid=%d\n", | |
51a87c55 | 1462 | ret->size, ret->type, ret->dev, ret->qid.type, |
b0d5fdef RD |
1463 | (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, |
1464 | ret->atime, ret->mtime, (unsigned long long)ret->length, | |
1465 | ret->name, ret->uid, ret->gid, ret->muid, ret->extension, | |
e7f4b8f1 | 1466 | ret->n_uid, ret->n_gid, ret->n_muid); |
bd238fb4 | 1467 | |
742b11a7 LI |
1468 | p9_free_req(clnt, req); |
1469 | return ret; | |
1470 | ||
bd238fb4 | 1471 | error: |
742b11a7 LI |
1472 | kfree(ret); |
1473 | return ERR_PTR(err); | |
bd238fb4 LI |
1474 | } |
1475 | EXPORT_SYMBOL(p9_client_stat); | |
1476 | ||
f0853122 SK |
1477 | struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, |
1478 | u64 request_mask) | |
1479 | { | |
1480 | int err; | |
1481 | struct p9_client *clnt; | |
1482 | struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), | |
1483 | GFP_KERNEL); | |
1484 | struct p9_req_t *req; | |
1485 | ||
1486 | P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", | |
1487 | fid->fid, request_mask); | |
1488 | ||
1489 | if (!ret) | |
1490 | return ERR_PTR(-ENOMEM); | |
1491 | ||
1492 | err = 0; | |
1493 | clnt = fid->clnt; | |
1494 | ||
1495 | req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); | |
1496 | if (IS_ERR(req)) { | |
1497 | err = PTR_ERR(req); | |
1498 | goto error; | |
1499 | } | |
1500 | ||
1501 | err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); | |
1502 | if (err) { | |
e660a828 | 1503 | P9_DUMP_PKT(1, req->rc); |
f0853122 SK |
1504 | p9_free_req(clnt, req); |
1505 | goto error; | |
1506 | } | |
1507 | ||
1508 | P9_DPRINTK(P9_DEBUG_9P, | |
1509 | "<<< RGETATTR st_result_mask=%lld\n" | |
1510 | "<<< qid=%x.%llx.%x\n" | |
1511 | "<<< st_mode=%8.8x st_nlink=%llu\n" | |
1512 | "<<< st_uid=%d st_gid=%d\n" | |
1513 | "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" | |
1514 | "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" | |
1515 | "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" | |
1516 | "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" | |
1517 | "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" | |
1518 | "<<< st_gen=%lld st_data_version=%lld", | |
1519 | ret->st_result_mask, ret->qid.type, ret->qid.path, | |
1520 | ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid, | |
1521 | ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize, | |
1522 | ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, | |
1523 | ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, | |
1524 | ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, | |
1525 | ret->st_gen, ret->st_data_version); | |
1526 | ||
1527 | p9_free_req(clnt, req); | |
1528 | return ret; | |
1529 | ||
1530 | error: | |
1531 | kfree(ret); | |
1532 | return ERR_PTR(err); | |
1533 | } | |
1534 | EXPORT_SYMBOL(p9_client_getattr_dotl); | |
1535 | ||
342fee1d | 1536 | static int p9_client_statsize(struct p9_wstat *wst, int proto_version) |
453ed90d LI |
1537 | { |
1538 | int ret; | |
1539 | ||
9d6939da | 1540 | /* NOTE: size shouldn't include its own length */ |
453ed90d LI |
1541 | /* size[2] type[2] dev[4] qid[13] */ |
1542 | /* mode[4] atime[4] mtime[4] length[8]*/ | |
1543 | /* name[s] uid[s] gid[s] muid[s] */ | |
9d6939da | 1544 | ret = 2+4+13+4+4+4+8+2+2+2+2; |
453ed90d LI |
1545 | |
1546 | if (wst->name) | |
1547 | ret += strlen(wst->name); | |
1548 | if (wst->uid) | |
1549 | ret += strlen(wst->uid); | |
1550 | if (wst->gid) | |
1551 | ret += strlen(wst->gid); | |
1552 | if (wst->muid) | |
1553 | ret += strlen(wst->muid); | |
1554 | ||
c56e4acf SK |
1555 | if ((proto_version == p9_proto_2000u) || |
1556 | (proto_version == p9_proto_2000L)) { | |
453ed90d LI |
1557 | ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ |
1558 | if (wst->extension) | |
1559 | ret += strlen(wst->extension); | |
1560 | } | |
1561 | ||
1562 | return ret; | |
1563 | } | |
1564 | ||
bd238fb4 LI |
1565 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) |
1566 | { | |
1567 | int err; | |
51a87c55 | 1568 | struct p9_req_t *req; |
bd238fb4 LI |
1569 | struct p9_client *clnt; |
1570 | ||
453ed90d LI |
1571 | err = 0; |
1572 | clnt = fid->clnt; | |
342fee1d | 1573 | wst->size = p9_client_statsize(wst, clnt->proto_version); |
51a87c55 | 1574 | P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); |
e7f4b8f1 EVH |
1575 | P9_DPRINTK(P9_DEBUG_9P, |
1576 | " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" | |
1577 | " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1578 | " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1579 | " uid=%d gid=%d n_muid=%d\n", | |
1580 | wst->size, wst->type, wst->dev, wst->qid.type, | |
b0d5fdef RD |
1581 | (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, |
1582 | wst->atime, wst->mtime, (unsigned long long)wst->length, | |
1583 | wst->name, wst->uid, wst->gid, wst->muid, wst->extension, | |
e7f4b8f1 | 1584 | wst->n_uid, wst->n_gid, wst->n_muid); |
bd238fb4 | 1585 | |
9d6939da | 1586 | req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); |
51a87c55 EVH |
1587 | if (IS_ERR(req)) { |
1588 | err = PTR_ERR(req); | |
1589 | goto error; | |
bd238fb4 LI |
1590 | } |
1591 | ||
51a87c55 | 1592 | P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); |
bd238fb4 | 1593 | |
51a87c55 EVH |
1594 | p9_free_req(clnt, req); |
1595 | error: | |
bd238fb4 LI |
1596 | return err; |
1597 | } | |
1598 | EXPORT_SYMBOL(p9_client_wstat); | |
bda8e775 | 1599 | |
87d7845a SK |
1600 | int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) |
1601 | { | |
1602 | int err; | |
1603 | struct p9_req_t *req; | |
1604 | struct p9_client *clnt; | |
1605 | ||
1606 | err = 0; | |
1607 | clnt = fid->clnt; | |
1608 | P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); | |
1609 | P9_DPRINTK(P9_DEBUG_9P, | |
1610 | " valid=%x mode=%x uid=%d gid=%d size=%lld\n" | |
1611 | " atime_sec=%lld atime_nsec=%lld\n" | |
1612 | " mtime_sec=%lld mtime_nsec=%lld\n", | |
1613 | p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid, | |
1614 | p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, | |
1615 | p9attr->mtime_sec, p9attr->mtime_nsec); | |
1616 | ||
1617 | req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); | |
1618 | ||
1619 | if (IS_ERR(req)) { | |
1620 | err = PTR_ERR(req); | |
1621 | goto error; | |
1622 | } | |
1623 | P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); | |
1624 | p9_free_req(clnt, req); | |
1625 | error: | |
1626 | return err; | |
1627 | } | |
1628 | EXPORT_SYMBOL(p9_client_setattr); | |
1629 | ||
bda8e775 SK |
1630 | int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) |
1631 | { | |
1632 | int err; | |
1633 | struct p9_req_t *req; | |
1634 | struct p9_client *clnt; | |
1635 | ||
1636 | err = 0; | |
1637 | clnt = fid->clnt; | |
1638 | ||
1639 | P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); | |
1640 | ||
1641 | req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); | |
1642 | if (IS_ERR(req)) { | |
1643 | err = PTR_ERR(req); | |
1644 | goto error; | |
1645 | } | |
1646 | ||
1647 | err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, | |
1648 | &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, | |
1649 | &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); | |
1650 | if (err) { | |
e660a828 | 1651 | P9_DUMP_PKT(1, req->rc); |
bda8e775 SK |
1652 | p9_free_req(clnt, req); |
1653 | goto error; | |
1654 | } | |
1655 | ||
1656 | P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " | |
1657 | "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " | |
1658 | "fsid %llu namelen %ld\n", | |
1659 | fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, | |
1660 | sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, | |
1661 | sb->fsid, (long int)sb->namelen); | |
1662 | ||
1663 | p9_free_req(clnt, req); | |
1664 | error: | |
1665 | return err; | |
1666 | } | |
1667 | EXPORT_SYMBOL(p9_client_statfs); | |
4681dbda SK |
1668 | |
1669 | int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name) | |
1670 | { | |
1671 | int err; | |
1672 | struct p9_req_t *req; | |
1673 | struct p9_client *clnt; | |
1674 | ||
1675 | err = 0; | |
1676 | clnt = fid->clnt; | |
1677 | ||
1678 | P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", | |
1679 | fid->fid, newdirfid->fid, name); | |
1680 | ||
1681 | req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, | |
1682 | newdirfid->fid, name); | |
1683 | if (IS_ERR(req)) { | |
1684 | err = PTR_ERR(req); | |
1685 | goto error; | |
1686 | } | |
1687 | ||
1688 | P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); | |
1689 | ||
1690 | p9_free_req(clnt, req); | |
1691 | error: | |
1692 | return err; | |
1693 | } | |
1694 | EXPORT_SYMBOL(p9_client_rename); | |
1695 | ||
0ef63f34 AK |
1696 | /* |
1697 | * An xattrwalk without @attr_name gives the fid for the lisxattr namespace | |
1698 | */ | |
1699 | struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, | |
1700 | const char *attr_name, u64 *attr_size) | |
1701 | { | |
1702 | int err; | |
1703 | struct p9_req_t *req; | |
1704 | struct p9_client *clnt; | |
1705 | struct p9_fid *attr_fid; | |
1706 | ||
1707 | err = 0; | |
1708 | clnt = file_fid->clnt; | |
1709 | attr_fid = p9_fid_create(clnt); | |
1710 | if (IS_ERR(attr_fid)) { | |
1711 | err = PTR_ERR(attr_fid); | |
1712 | attr_fid = NULL; | |
1713 | goto error; | |
1714 | } | |
1715 | P9_DPRINTK(P9_DEBUG_9P, | |
1716 | ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", | |
1717 | file_fid->fid, attr_fid->fid, attr_name); | |
1718 | ||
1719 | req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", | |
1720 | file_fid->fid, attr_fid->fid, attr_name); | |
1721 | if (IS_ERR(req)) { | |
1722 | err = PTR_ERR(req); | |
1723 | goto error; | |
1724 | } | |
1725 | err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); | |
1726 | if (err) { | |
e660a828 | 1727 | P9_DUMP_PKT(1, req->rc); |
0ef63f34 AK |
1728 | p9_free_req(clnt, req); |
1729 | goto clunk_fid; | |
1730 | } | |
1731 | p9_free_req(clnt, req); | |
1732 | P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", | |
1733 | attr_fid->fid, *attr_size); | |
1734 | return attr_fid; | |
1735 | clunk_fid: | |
1736 | p9_client_clunk(attr_fid); | |
1737 | attr_fid = NULL; | |
1738 | error: | |
1739 | if (attr_fid && (attr_fid != file_fid)) | |
1740 | p9_fid_destroy(attr_fid); | |
1741 | ||
1742 | return ERR_PTR(err); | |
1743 | } | |
1744 | EXPORT_SYMBOL_GPL(p9_client_xattrwalk); | |
1745 | ||
eda25e46 AK |
1746 | int p9_client_xattrcreate(struct p9_fid *fid, const char *name, |
1747 | u64 attr_size, int flags) | |
1748 | { | |
1749 | int err; | |
1750 | struct p9_req_t *req; | |
1751 | struct p9_client *clnt; | |
1752 | ||
1753 | P9_DPRINTK(P9_DEBUG_9P, | |
1754 | ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", | |
1755 | fid->fid, name, (long long)attr_size, flags); | |
1756 | err = 0; | |
1757 | clnt = fid->clnt; | |
1758 | req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", | |
1759 | fid->fid, name, attr_size, flags); | |
1760 | if (IS_ERR(req)) { | |
1761 | err = PTR_ERR(req); | |
1762 | goto error; | |
1763 | } | |
1764 | P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); | |
1765 | p9_free_req(clnt, req); | |
1766 | error: | |
1767 | return err; | |
1768 | } | |
1769 | EXPORT_SYMBOL_GPL(p9_client_xattrcreate); | |
1770 | ||
7751bdb3 SK |
1771 | int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) |
1772 | { | |
095d3da6 | 1773 | int err, rsize; |
7751bdb3 SK |
1774 | struct p9_client *clnt; |
1775 | struct p9_req_t *req; | |
1776 | char *dataptr; | |
1777 | ||
1778 | P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", | |
1779 | fid->fid, (long long unsigned) offset, count); | |
1780 | ||
1781 | err = 0; | |
1782 | clnt = fid->clnt; | |
7751bdb3 SK |
1783 | |
1784 | rsize = fid->iounit; | |
1785 | if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) | |
1786 | rsize = clnt->msize - P9_READDIRHDRSZ; | |
1787 | ||
1788 | if (count < rsize) | |
1789 | rsize = count; | |
1790 | ||
2c66523f VJJ |
1791 | if ((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) == |
1792 | P9_TRANS_PREF_PAYLOAD_SEP) { | |
1793 | req = p9_client_rpc(clnt, P9_TREADDIR, "dqF", fid->fid, | |
1794 | offset, rsize, data); | |
1795 | } else { | |
1796 | req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, | |
1797 | offset, rsize); | |
1798 | } | |
7751bdb3 SK |
1799 | if (IS_ERR(req)) { |
1800 | err = PTR_ERR(req); | |
1801 | goto error; | |
1802 | } | |
1803 | ||
1804 | err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); | |
1805 | if (err) { | |
e660a828 | 1806 | P9_DUMP_PKT(1, req->rc); |
7751bdb3 SK |
1807 | goto free_and_error; |
1808 | } | |
1809 | ||
1810 | P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); | |
1811 | ||
2c66523f | 1812 | if (!req->tc->pbuf_size && data) |
7751bdb3 SK |
1813 | memmove(data, dataptr, count); |
1814 | ||
1815 | p9_free_req(clnt, req); | |
1816 | return count; | |
1817 | ||
1818 | free_and_error: | |
1819 | p9_free_req(clnt, req); | |
1820 | error: | |
1821 | return err; | |
1822 | } | |
1823 | EXPORT_SYMBOL(p9_client_readdir); | |
4b43516a MK |
1824 | |
1825 | int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode, | |
1826 | dev_t rdev, gid_t gid, struct p9_qid *qid) | |
1827 | { | |
1828 | int err; | |
1829 | struct p9_client *clnt; | |
1830 | struct p9_req_t *req; | |
1831 | ||
1832 | err = 0; | |
1833 | clnt = fid->clnt; | |
1834 | P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " | |
1835 | "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); | |
1836 | req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode, | |
1837 | MAJOR(rdev), MINOR(rdev), gid); | |
1838 | if (IS_ERR(req)) | |
1839 | return PTR_ERR(req); | |
1840 | ||
1841 | err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); | |
1842 | if (err) { | |
e660a828 | 1843 | P9_DUMP_PKT(1, req->rc); |
4b43516a MK |
1844 | goto error; |
1845 | } | |
1846 | P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, | |
1847 | (unsigned long long)qid->path, qid->version); | |
1848 | ||
1849 | error: | |
1850 | p9_free_req(clnt, req); | |
1851 | return err; | |
1852 | ||
1853 | } | |
1854 | EXPORT_SYMBOL(p9_client_mknod_dotl); | |
01a622bd MK |
1855 | |
1856 | int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode, | |
1857 | gid_t gid, struct p9_qid *qid) | |
1858 | { | |
1859 | int err; | |
1860 | struct p9_client *clnt; | |
1861 | struct p9_req_t *req; | |
1862 | ||
1863 | err = 0; | |
1864 | clnt = fid->clnt; | |
1865 | P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", | |
1866 | fid->fid, name, mode, gid); | |
1867 | req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode, | |
1868 | gid); | |
1869 | if (IS_ERR(req)) | |
1870 | return PTR_ERR(req); | |
1871 | ||
1872 | err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); | |
1873 | if (err) { | |
e660a828 | 1874 | P9_DUMP_PKT(1, req->rc); |
01a622bd MK |
1875 | goto error; |
1876 | } | |
1877 | P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, | |
1878 | (unsigned long long)qid->path, qid->version); | |
1879 | ||
1880 | error: | |
1881 | p9_free_req(clnt, req); | |
1882 | return err; | |
1883 | ||
1884 | } | |
1885 | EXPORT_SYMBOL(p9_client_mkdir_dotl); | |
a099027c MK |
1886 | |
1887 | int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) | |
1888 | { | |
1889 | int err; | |
1890 | struct p9_client *clnt; | |
1891 | struct p9_req_t *req; | |
1892 | ||
1893 | err = 0; | |
1894 | clnt = fid->clnt; | |
1895 | P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " | |
1896 | "start %lld length %lld proc_id %d client_id %s\n", | |
1897 | fid->fid, flock->type, flock->flags, flock->start, | |
1898 | flock->length, flock->proc_id, flock->client_id); | |
1899 | ||
1900 | req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, | |
1901 | flock->flags, flock->start, flock->length, | |
1902 | flock->proc_id, flock->client_id); | |
1903 | ||
1904 | if (IS_ERR(req)) | |
1905 | return PTR_ERR(req); | |
1906 | ||
1907 | err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); | |
1908 | if (err) { | |
e660a828 | 1909 | P9_DUMP_PKT(1, req->rc); |
a099027c MK |
1910 | goto error; |
1911 | } | |
1912 | P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); | |
1913 | error: | |
1914 | p9_free_req(clnt, req); | |
1915 | return err; | |
1916 | ||
1917 | } | |
1918 | EXPORT_SYMBOL(p9_client_lock_dotl); | |
1d769cd1 MK |
1919 | |
1920 | int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) | |
1921 | { | |
1922 | int err; | |
1923 | struct p9_client *clnt; | |
1924 | struct p9_req_t *req; | |
1925 | ||
1926 | err = 0; | |
1927 | clnt = fid->clnt; | |
1928 | P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " | |
1929 | "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, | |
1930 | glock->start, glock->length, glock->proc_id, glock->client_id); | |
1931 | ||
1932 | req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, | |
1933 | glock->start, glock->length, glock->proc_id, glock->client_id); | |
1934 | ||
1935 | if (IS_ERR(req)) | |
1936 | return PTR_ERR(req); | |
1937 | ||
1938 | err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, | |
1939 | &glock->start, &glock->length, &glock->proc_id, | |
1940 | &glock->client_id); | |
1941 | if (err) { | |
e660a828 | 1942 | P9_DUMP_PKT(1, req->rc); |
1d769cd1 MK |
1943 | goto error; |
1944 | } | |
1945 | P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " | |
1946 | "proc_id %d client_id %s\n", glock->type, glock->start, | |
1947 | glock->length, glock->proc_id, glock->client_id); | |
1948 | error: | |
1949 | p9_free_req(clnt, req); | |
1950 | return err; | |
1951 | } | |
1952 | EXPORT_SYMBOL(p9_client_getlock_dotl); | |
329176cc MK |
1953 | |
1954 | int p9_client_readlink(struct p9_fid *fid, char **target) | |
1955 | { | |
1956 | int err; | |
1957 | struct p9_client *clnt; | |
1958 | struct p9_req_t *req; | |
1959 | ||
1960 | err = 0; | |
1961 | clnt = fid->clnt; | |
1962 | P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); | |
1963 | ||
1964 | req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); | |
1965 | if (IS_ERR(req)) | |
1966 | return PTR_ERR(req); | |
1967 | ||
1968 | err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); | |
1969 | if (err) { | |
e660a828 | 1970 | P9_DUMP_PKT(1, req->rc); |
329176cc MK |
1971 | goto error; |
1972 | } | |
1973 | P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); | |
1974 | error: | |
1975 | p9_free_req(clnt, req); | |
1976 | return err; | |
1977 | } | |
1978 | EXPORT_SYMBOL(p9_client_readlink); |