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Merge branch 'drm-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied...
[linux-block.git] / net / 9p / client.c
CommitLineData
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
46enum {
47 Opt_msize,
48 Opt_trans,
49 Opt_legacy,
0fb80abd 50 Opt_version,
8a0dc95f
EVH		 51 Opt_err,
52};
53
a447c093 54static 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		 62inline int p9_is_proto_dotl(struct p9_client *clnt)
63{
a02cec21 64 return clnt->proto_version == p9_proto_2000L;
342fee1d
SK		 65}
66EXPORT_SYMBOL(p9_is_proto_dotl);
67
68inline int p9_is_proto_dotu(struct p9_client *clnt)
69{
a02cec21 70 return clnt->proto_version == p9_proto_2000u;
342fee1d
SK		 71}
72EXPORT_SYMBOL(p9_is_proto_dotu);
73
0fb80abd 74/* Interpret mount option for protocol version */
3dc9fef6 75static int get_protocol_version(const substring_t *name)
0fb80abd 76{
3dc9fef6
DC		 77 int version = -EINVAL;
78
0fb80abd
SK		 79 if (!strncmp("9p2000", name->from, name->to-name->from)) {
80 version = p9_proto_legacy;
81 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
82 } else if (!strncmp("9p2000.u", name->from, name->to-name->from)) {
83 version = p9_proto_2000u;
84 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
45bc21ed
SK		 85 } else if (!strncmp("9p2000.L", name->from, name->to-name->from)) {
86 version = p9_proto_2000L;
87 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
0fb80abd
SK		 88 } else {
89 P9_DPRINTK(P9_DEBUG_ERROR, "Unknown protocol version %s. ",
90 name->from);
91 }
92 return version;
93}
94
51a87c55
EVH		 95static struct p9_req_t *
96p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
91b8534f 97
8a0dc95f 98/**
0e15597e
AK		 99 * parse_options - parse mount options into client structure
100 * @opts: options string passed from mount
101 * @clnt: existing v9fs client information
8a0dc95f 102 *
bb8ffdfc 103 * Return 0 upon success, -ERRNO upon failure
8a0dc95f
EVH		 104 */
105
bb8ffdfc 106static int parse_opts(char *opts, struct p9_client *clnt)
8a0dc95f 107{
d8c8a9e3 108 char *options, *tmp_options;
8a0dc95f
EVH		 109 char *p;
110 substring_t args[MAX_OPT_ARGS];
111 int option;
bb8ffdfc 112 int ret = 0;
8a0dc95f 113
342fee1d 114 clnt->proto_version = p9_proto_2000u;
8a0dc95f
EVH		 115 clnt->msize = 8192;
116
bb8ffdfc
EVH		 117 if (!opts)
118 return 0;
119
d8c8a9e3
EVH		 120 tmp_options = kstrdup(opts, GFP_KERNEL);
121 if (!tmp_options) {
bb8ffdfc
EVH		 122 P9_DPRINTK(P9_DEBUG_ERROR,
123 "failed to allocate copy of option string\n");
124 return -ENOMEM;
125 }
d8c8a9e3 126 options = tmp_options;
8a0dc95f
EVH		 127
128 while ((p = strsep(&options, ",")) != NULL) {
129 int token;
130 if (!*p)
131 continue;
132 token = match_token(p, tokens, args);
133 if (token < Opt_trans) {
bb8ffdfc
EVH		 134 int r = match_int(&args[0], &option);
135 if (r < 0) {
8a0dc95f
EVH		 136 P9_DPRINTK(P9_DEBUG_ERROR,
137 "integer field, but no integer?\n");
bb8ffdfc 138 ret = r;
8a0dc95f
EVH		 139 continue;
140 }
141 }
142 switch (token) {
143 case Opt_msize:
144 clnt->msize = option;
145 break;
146 case Opt_trans:
72029fe8 147 clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
349d3bb8
EVH		 148 if(clnt->trans_mod == NULL) {
149 P9_DPRINTK(P9_DEBUG_ERROR,
150 "Could not find request transport: %s\n",
151 (char *) &args[0]);
152 ret = -EINVAL;
153 goto free_and_return;
154 }
8a0dc95f
EVH		 155 break;
156 case Opt_legacy:
342fee1d 157 clnt->proto_version = p9_proto_legacy;
8a0dc95f 158 break;
0fb80abd
SK		 159 case Opt_version:
160 ret = get_protocol_version(&args[0]);
161 if (ret == -EINVAL)
162 goto free_and_return;
163 clnt->proto_version = ret;
164 break;
8a0dc95f
EVH		 165 default:
166 continue;
167 }
168 }
72029fe8 169
349d3bb8 170free_and_return:
d8c8a9e3 171 kfree(tmp_options);
bb8ffdfc 172 return ret;
8a0dc95f
EVH		 173}
174
fea511a6
EVH		 175/**
176 * p9_tag_alloc - lookup/allocate a request by tag
177 * @c: client session to lookup tag within
178 * @tag: numeric id for transaction
179 *
180 * this is a simple array lookup, but will grow the
25985edc 181 * request_slots as necessary to accommodate transaction
fea511a6
EVH		 182 * ids which did not previously have a slot.
183 *
184 * this code relies on the client spinlock to manage locks, its
185 * possible we should switch to something else, but I'd rather
186 * stick with something low-overhead for the common case.
187 *
188 */
189
51a87c55 190static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
fea511a6
EVH		 191{
192 unsigned long flags;
193 int row, col;
51a87c55 194 struct p9_req_t *req;
fea511a6
EVH		 195
196 /* This looks up the original request by tag so we know which
197 * buffer to read the data into */
198 tag++;
199
200 if (tag >= c->max_tag) {
201 spin_lock_irqsave(&c->lock, flags);
202 /* check again since original check was outside of lock */
203 while (tag >= c->max_tag) {
204 row = (tag / P9_ROW_MAXTAG);
205 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
206 sizeof(struct p9_req_t), GFP_ATOMIC);
207
208 if (!c->reqs[row]) {
209 printk(KERN_ERR "Couldn't grow tag array\n");
e45c5405 210 spin_unlock_irqrestore(&c->lock, flags);
51a87c55 211 return ERR_PTR(-ENOMEM);
fea511a6
EVH		 212 }
213 for (col = 0; col < P9_ROW_MAXTAG; col++) {
214 c->reqs[row][col].status = REQ_STATUS_IDLE;
51a87c55 215 c->reqs[row][col].tc = NULL;
fea511a6
EVH		 216 }
217 c->max_tag += P9_ROW_MAXTAG;
218 }
219 spin_unlock_irqrestore(&c->lock, flags);
220 }
221 row = tag / P9_ROW_MAXTAG;
222 col = tag % P9_ROW_MAXTAG;
223
51a87c55
EVH		 224 req = &c->reqs[row][col];
225 if (!req->tc) {
eeff66ef 226 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
51a87c55
EVH		 227 if (!req->wq) {
228 printk(KERN_ERR "Couldn't grow tag array\n");
229 return ERR_PTR(-ENOMEM);
230 }
231 init_waitqueue_head(req->wq);
f735195d
VJJ		 232 if ((c->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
233 P9_TRANS_PREF_PAYLOAD_SEP) {
234 int alloc_msize = min(c->msize, 4096);
235 req->tc = kmalloc(sizeof(struct p9_fcall)+alloc_msize,
eeff66ef 236 GFP_NOFS);
f735195d
VJJ		 237 req->tc->capacity = alloc_msize;
238 req->rc = kmalloc(sizeof(struct p9_fcall)+alloc_msize,
eeff66ef 239 GFP_NOFS);
f735195d
VJJ		 240 req->rc->capacity = alloc_msize;
241 } else {
242 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
eeff66ef 243 GFP_NOFS);
f735195d
VJJ		 244 req->tc->capacity = c->msize;
245 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
eeff66ef 246 GFP_NOFS);
f735195d
VJJ		 247 req->rc->capacity = c->msize;
248 }
51a87c55
EVH		 249 if ((!req->tc) || (!req->rc)) {
250 printk(KERN_ERR "Couldn't grow tag array\n");
251 kfree(req->tc);
252 kfree(req->rc);
45abdf1c
TT		 253 kfree(req->wq);
254 req->tc = req->rc = NULL;
255 req->wq = NULL;
51a87c55
EVH		 256 return ERR_PTR(-ENOMEM);
257 }
258 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
51a87c55 259 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
51a87c55
EVH		 260 }
261
262 p9pdu_reset(req->tc);
263 p9pdu_reset(req->rc);
264
51a87c55
EVH		 265 req->tc->tag = tag-1;
266 req->status = REQ_STATUS_ALLOC;
fea511a6
EVH		 267
268 return &c->reqs[row][col];
269}
fea511a6
EVH		 270
271/**
272 * p9_tag_lookup - lookup a request by tag
273 * @c: client session to lookup tag within
274 * @tag: numeric id for transaction
275 *
276 */
277
278struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
279{
280 int row, col;
281
282 /* This looks up the original request by tag so we know which
283 * buffer to read the data into */
284 tag++;
285
286 BUG_ON(tag >= c->max_tag);
287
288 row = tag / P9_ROW_MAXTAG;
289 col = tag % P9_ROW_MAXTAG;
290
291 return &c->reqs[row][col];
292}
293EXPORT_SYMBOL(p9_tag_lookup);
294
295/**
296 * p9_tag_init - setup tags structure and contents
0e15597e 297 * @c: v9fs client struct
fea511a6
EVH		 298 *
299 * This initializes the tags structure for each client instance.
300 *
301 */
302
303static int p9_tag_init(struct p9_client *c)
304{
305 int err = 0;
306
307 c->tagpool = p9_idpool_create();
308 if (IS_ERR(c->tagpool)) {
309 err = PTR_ERR(c->tagpool);
310 c->tagpool = NULL;
311 goto error;
312 }
313
314 p9_idpool_get(c->tagpool); /* reserve tag 0 */
315
316 c->max_tag = 0;
317error:
318 return err;
319}
320
321/**
322 * p9_tag_cleanup - cleans up tags structure and reclaims resources
0e15597e 323 * @c: v9fs client struct
fea511a6
EVH		 324 *
325 * This frees resources associated with the tags structure
326 *
327 */
328static void p9_tag_cleanup(struct p9_client *c)
329{
330 int row, col;
331
332 /* check to insure all requests are idle */
333 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
334 for (col = 0; col < P9_ROW_MAXTAG; col++) {
335 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
336 P9_DPRINTK(P9_DEBUG_MUX,
337 "Attempting to cleanup non-free tag %d,%d\n",
338 row, col);
339 /* TODO: delay execution of cleanup */
340 return;
341 }
342 }
343 }
344
62b2be59
LI		 345 if (c->tagpool) {
346 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
fea511a6 347 p9_idpool_destroy(c->tagpool);
62b2be59 348 }
fea511a6
EVH		 349
350 /* free requests associated with tags */
351 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
51a87c55 352 for (col = 0; col < P9_ROW_MAXTAG; col++) {
fea511a6 353 kfree(c->reqs[row][col].wq);
51a87c55
EVH		 354 kfree(c->reqs[row][col].tc);
355 kfree(c->reqs[row][col].rc);
356 }
fea511a6
EVH		 357 kfree(c->reqs[row]);
358 }
359 c->max_tag = 0;
360}
361
673d62cd
EVH		 362/**
363 * p9_free_req - free a request and clean-up as necessary
364 * c: client state
365 * r: request to release
366 *
367 */
368
51a87c55 369static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
673d62cd 370{
51a87c55
EVH		 371 int tag = r->tc->tag;
372 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
373
673d62cd 374 r->status = REQ_STATUS_IDLE;
51a87c55
EVH		 375 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
376 p9_idpool_put(tag, c->tagpool);
673d62cd
EVH		 377}
378
91b8534f
EVH		 379/**
380 * p9_client_cb - call back from transport to client
381 * c: client state
382 * req: request received
383 *
384 */
385void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
386{
51a87c55 387 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
1bab88b2
LI		 388 wake_up(req->wq);
389 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
91b8534f
EVH		 390}
391EXPORT_SYMBOL(p9_client_cb);
392
51a87c55
EVH		 393/**
394 * p9_parse_header - parse header arguments out of a packet
395 * @pdu: packet to parse
396 * @size: size of packet
397 * @type: type of request
398 * @tag: tag of packet
399 * @rewind: set if we need to rewind offset afterwards
400 */
401
402int
403p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
404 int rewind)
405{
406 int8_t r_type;
407 int16_t r_tag;
408 int32_t r_size;
409 int offset = pdu->offset;
410 int err;
411
412 pdu->offset = 0;
413 if (pdu->size == 0)
414 pdu->size = 7;
415
416 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
417 if (err)
418 goto rewind_and_exit;
419
420 pdu->size = r_size;
421 pdu->id = r_type;
422 pdu->tag = r_tag;
423
e7f4b8f1
EVH		 424 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
425 pdu->id, pdu->tag);
51a87c55
EVH		 426
427 if (type)
428 *type = r_type;
429 if (tag)
430 *tag = r_tag;
431 if (size)
432 *size = r_size;
433
434
435rewind_and_exit:
436 if (rewind)
437 pdu->offset = offset;
438 return err;
439}
440EXPORT_SYMBOL(p9_parse_header);
441
442/**
443 * p9_check_errors - check 9p packet for error return and process it
444 * @c: current client instance
445 * @req: request to parse and check for error conditions
446 *
447 * returns error code if one is discovered, otherwise returns 0
448 *
449 * this will have to be more complicated if we have multiple
450 * error packet types
451 */
452
453static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
454{
455 int8_t type;
456 int err;
ca41bb3e 457 int ecode;
51a87c55
EVH		 458
459 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
460 if (err) {
461 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
462 return err;
463 }
464
ca41bb3e
VJJ		 465 if (type != P9_RERROR && type != P9_RLERROR)
466 return 0;
4f7ebe80 467
ca41bb3e
VJJ		 468 if (!p9_is_proto_dotl(c)) {
469 char *ename;
470
471 if (req->tc->pbuf_size) {
472 /* Handle user buffers */
473 size_t len = req->rc->size - req->rc->offset;
474 if (req->tc->pubuf) {
475 /* User Buffer */
476 err = copy_from_user(
477 &req->rc->sdata[req->rc->offset],
478 req->tc->pubuf, len);
479 if (err) {
480 err = -EFAULT;
481 goto out_err;
482 }
483 } else {
484 /* Kernel Buffer */
485 memmove(&req->rc->sdata[req->rc->offset],
486 req->tc->pkbuf, len);
487 }
488 }
489 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
490 &ename, &ecode);
491 if (err)
492 goto out_err;
4f7ebe80 493
ca41bb3e
VJJ		 494 if (p9_is_proto_dotu(c))
495 err = -ecode;
4f7ebe80 496
ca41bb3e
VJJ		 497 if (!err || !IS_ERR_VALUE(err)) {
498 err = p9_errstr2errno(ename, strlen(ename));
4f7ebe80 499
ca41bb3e
VJJ		 500 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode,
501 ename);
51a87c55 502
ca41bb3e 503 kfree(ename);
4f7ebe80 504 }
ca41bb3e
VJJ		 505 } else {
506 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
507 err = -ecode;
508
509 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
510 }
51a87c55 511
51a87c55
EVH		 512
513 return err;
4f7ebe80
AB		 514
515out_err:
516 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
517
518 return err;
51a87c55
EVH		 519}
520
521/**
522 * p9_client_flush - flush (cancel) a request
0e15597e
AK		 523 * @c: client state
524 * @oldreq: request to cancel
51a87c55
EVH		 525 *
526 * This sents a flush for a particular requests and links
527 * the flush request to the original request. The current
528 * code only supports a single flush request although the protocol
529 * allows for multiple flush requests to be sent for a single request.
530 *
531 */
532
533static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
534{
535 struct p9_req_t *req;
536 int16_t oldtag;
537 int err;
538
539 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
540 if (err)
541 return err;
542
543 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
544
545 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
546 if (IS_ERR(req))
547 return PTR_ERR(req);
548
51a87c55 549
1bab88b2
LI		 550 /* if we haven't received a response for oldreq,
551 remove it from the list. */
552 spin_lock(&c->lock);
553 if (oldreq->status == REQ_STATUS_FLSH)
554 list_del(&oldreq->req_list);
555 spin_unlock(&c->lock);
556
557 p9_free_req(c, req);
51a87c55
EVH		 558 return 0;
559}
560
91b8534f
EVH		 561/**
562 * p9_client_rpc - issue a request and wait for a response
563 * @c: client session
51a87c55
EVH		 564 * @type: type of request
565 * @fmt: protocol format string (see protocol.c)
91b8534f 566 *
51a87c55 567 * Returns request structure (which client must free using p9_free_req)
91b8534f
EVH		 568 */
569
51a87c55
EVH		 570static struct p9_req_t *
571p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
91b8534f 572{
51a87c55
EVH		 573 va_list ap;
574 int tag, err;
91b8534f
EVH		 575 struct p9_req_t *req;
576 unsigned long flags;
577 int sigpending;
91b8534f 578
51a87c55 579 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
91b8534f 580
6d96d3ab
AK		 581 /* we allow for any status other than disconnected */
582 if (c->status == Disconnected)
583 return ERR_PTR(-EIO);
584
585 /* if status is begin_disconnected we allow only clunk request */
586 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
51a87c55 587 return ERR_PTR(-EIO);
91b8534f
EVH		 588
589 if (signal_pending(current)) {
590 sigpending = 1;
591 clear_thread_flag(TIF_SIGPENDING);
592 } else
593 sigpending = 0;
594
595 tag = P9_NOTAG;
51a87c55 596 if (type != P9_TVERSION) {
91b8534f
EVH		 597 tag = p9_idpool_get(c->tagpool);
598 if (tag < 0)
51a87c55 599 return ERR_PTR(-ENOMEM);
91b8534f
EVH		 600 }
601
602 req = p9_tag_alloc(c, tag);
51a87c55
EVH		 603 if (IS_ERR(req))
604 return req;
91b8534f 605
51a87c55
EVH		 606 /* marshall the data */
607 p9pdu_prepare(req->tc, tag, type);
608 va_start(ap, fmt);
342fee1d 609 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
51a87c55 610 va_end(ap);
7b3bb3fe
AK		 611 if (err)
612 goto reterr;
51a87c55 613 p9pdu_finalize(req->tc);
91b8534f
EVH		 614
615 err = c->trans_mod->request(c, req);
616 if (err < 0) {
3cd79678 617 if (err != -ERESTARTSYS && err != -EFAULT)
52f44e0d 618 c->status = Disconnected;
91b8534f
EVH		 619 goto reterr;
620 }
621
51a87c55 622 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
91b8534f
EVH		 623 err = wait_event_interruptible(*req->wq,
624 req->status >= REQ_STATUS_RCVD);
1bab88b2
LI		 625 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
626 req->wq, tag, err);
91b8534f
EVH		 627
628 if (req->status == REQ_STATUS_ERROR) {
51a87c55 629 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
91b8534f 630 err = req->t_err;
91b8534f
EVH		 631 }
632
1bab88b2 633 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
51a87c55 634 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
91b8534f 635 sigpending = 1;
91b8534f
EVH		 636 clear_thread_flag(TIF_SIGPENDING);
637
1bab88b2
LI		 638 if (c->trans_mod->cancel(c, req))
639 p9_client_flush(c, req);
640
641 /* if we received the response anyway, don't signal error */
642 if (req->status == REQ_STATUS_RCVD)
643 err = 0;
91b8534f
EVH		 644 }
645
646 if (sigpending) {
647 spin_lock_irqsave(&current->sighand->siglock, flags);
648 recalc_sigpending();
649 spin_unlock_irqrestore(&current->sighand->siglock, flags);
650 }
651
652 if (err < 0)
653 goto reterr;
654
51a87c55
EVH		 655 err = p9_check_errors(c, req);
656 if (!err) {
657 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
658 return req;
91b8534f
EVH		 659 }
660
91b8534f 661reterr:
51a87c55
EVH		 662 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
663 err);
91b8534f 664 p9_free_req(c, req);
51a87c55 665 return ERR_PTR(err);
91b8534f
EVH		 666}
667
5503ac56
EVH		 668static struct p9_fid *p9_fid_create(struct p9_client *clnt)
669{
9f3e9bbe 670 int ret;
5503ac56 671 struct p9_fid *fid;
cac23d65 672 unsigned long flags;
5503ac56 673
51a87c55 674 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
5503ac56
EVH		 675 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
676 if (!fid)
677 return ERR_PTR(-ENOMEM);
678
9f3e9bbe 679 ret = p9_idpool_get(clnt->fidpool);
24e94de4 680 if (ret < 0) {
9f3e9bbe 681 ret = -ENOSPC;
5503ac56
EVH		 682 goto error;
683 }
9f3e9bbe 684 fid->fid = ret;
5503ac56
EVH		 685
686 memset(&fid->qid, 0, sizeof(struct p9_qid));
687 fid->mode = -1;
f8b9d53a 688 fid->uid = current_fsuid();
5503ac56 689 fid->clnt = clnt;
3e2796a9 690 fid->rdir = NULL;
cac23d65 691 spin_lock_irqsave(&clnt->lock, flags);
5503ac56 692 list_add(&fid->flist, &clnt->fidlist);
cac23d65 693 spin_unlock_irqrestore(&clnt->lock, flags);
5503ac56
EVH		 694
695 return fid;
696
697error:
698 kfree(fid);
9f3e9bbe 699 return ERR_PTR(ret);
5503ac56
EVH		 700}
701
702static void p9_fid_destroy(struct p9_fid *fid)
703{
704 struct p9_client *clnt;
cac23d65 705 unsigned long flags;
5503ac56 706
51a87c55 707 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
5503ac56
EVH		 708 clnt = fid->clnt;
709 p9_idpool_put(fid->fid, clnt->fidpool);
cac23d65 710 spin_lock_irqsave(&clnt->lock, flags);
5503ac56 711 list_del(&fid->flist);
cac23d65 712 spin_unlock_irqrestore(&clnt->lock, flags);
3e2796a9 713 kfree(fid->rdir);
5503ac56
EVH		 714 kfree(fid);
715}
8a0dc95f 716
32a875ad 717static int p9_client_version(struct p9_client *c)
bd238fb4 718{
6936bf60 719 int err = 0;
51a87c55
EVH		 720 struct p9_req_t *req;
721 char *version;
722 int msize;
bd238fb4 723
342fee1d
SK		 724 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
725 c->msize, c->proto_version);
c5a7697d
SK		 726
727 switch (c->proto_version) {
45bc21ed 728 case p9_proto_2000L:
c5a7697d 729 req = p9_client_rpc(c, P9_TVERSION, "ds",
45bc21ed 730 c->msize, "9P2000.L");
c5a7697d
SK		 731 break;
732 case p9_proto_2000u:
733 req = p9_client_rpc(c, P9_TVERSION, "ds",
734 c->msize, "9P2000.u");
735 break;
736 case p9_proto_legacy:
737 req = p9_client_rpc(c, P9_TVERSION, "ds",
738 c->msize, "9P2000");
739 break;
740 default:
741 return -EINVAL;
742 break;
743 }
744
51a87c55
EVH		 745 if (IS_ERR(req))
746 return PTR_ERR(req);
6936bf60 747
342fee1d 748 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
51a87c55
EVH		 749 if (err) {
750 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
e7f4b8f1 751 p9pdu_dump(1, req->rc);
6936bf60 752 goto error;
51a87c55 753 }
6936bf60 754
51a87c55 755 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
45bc21ed
SK		 756 if (!strncmp(version, "9P2000.L", 8))
757 c->proto_version = p9_proto_2000L;
c5a7697d 758 else if (!strncmp(version, "9P2000.u", 8))
342fee1d
SK		 759 c->proto_version = p9_proto_2000u;
760 else if (!strncmp(version, "9P2000", 6))
761 c->proto_version = p9_proto_legacy;
6936bf60
EVH		 762 else {
763 err = -EREMOTEIO;
764 goto error;
765 }
766
51a87c55
EVH		 767 if (msize < c->msize)
768 c->msize = msize;
6936bf60
EVH		 769
770error:
51a87c55
EVH		 771 kfree(version);
772 p9_free_req(c, req);
6936bf60
EVH		 773
774 return err;
775}
6936bf60
EVH		 776
777struct p9_client *p9_client_create(const char *dev_name, char *options)
778{
779 int err;
780 struct p9_client *clnt;
781
782 err = 0;
bd238fb4
LI		 783 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
784 if (!clnt)
785 return ERR_PTR(-ENOMEM);
786
72029fe8 787 clnt->trans_mod = NULL;
bb8ffdfc 788 clnt->trans = NULL;
bd238fb4 789 spin_lock_init(&clnt->lock);
bd238fb4 790 INIT_LIST_HEAD(&clnt->fidlist);
bd238fb4 791
fea511a6
EVH		 792 p9_tag_init(clnt);
793
bb8ffdfc
EVH		 794 err = parse_opts(options, clnt);
795 if (err < 0)
8781ff94 796 goto free_client;
bb8ffdfc 797
a17d1720
AK		 798 if (!clnt->trans_mod)
799 clnt->trans_mod = v9fs_get_default_trans();
800
8a0dc95f
EVH		 801 if (clnt->trans_mod == NULL) {
802 err = -EPROTONOSUPPORT;
803 P9_DPRINTK(P9_DEBUG_ERROR,
804 "No transport defined or default transport\n");
8781ff94
EVH		 805 goto free_client;
806 }
807
808 clnt->fidpool = p9_idpool_create();
809 if (IS_ERR(clnt->fidpool)) {
810 err = PTR_ERR(clnt->fidpool);
811 clnt->fidpool = NULL;
812 goto put_trans;
8a0dc95f
EVH		 813 }
814
342fee1d
SK		 815 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
816 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
8a0dc95f 817
8b81ef58
EVH		 818 err = clnt->trans_mod->create(clnt, dev_name, options);
819 if (err)
8781ff94 820 goto destroy_fidpool;
bd238fb4 821
8a0dc95f
EVH		 822 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
823 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
824
6936bf60 825 err = p9_client_version(clnt);
bd238fb4 826 if (err)
8781ff94 827 goto close_trans;
bd238fb4 828
bd238fb4
LI		 829 return clnt;
830
8781ff94
EVH		 831close_trans:
832 clnt->trans_mod->close(clnt);
833destroy_fidpool:
834 p9_idpool_destroy(clnt->fidpool);
835put_trans:
836 v9fs_put_trans(clnt->trans_mod);
837free_client:
838 kfree(clnt);
bd238fb4
LI		 839 return ERR_PTR(err);
840}
841EXPORT_SYMBOL(p9_client_create);
842
843void p9_client_destroy(struct p9_client *clnt)
844{
845 struct p9_fid *fid, *fidptr;
846
51a87c55 847 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
bd238fb4 848
8b81ef58
EVH		 849 if (clnt->trans_mod)
850 clnt->trans_mod->close(clnt);
bd238fb4 851
72029fe8
TH		 852 v9fs_put_trans(clnt->trans_mod);
853
6d96d3ab
AK		 854 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
855 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
bd238fb4 856 p9_fid_destroy(fid);
6d96d3ab 857 }
bd238fb4 858
0af8887e
EVH		 859 if (clnt->fidpool)
860 p9_idpool_destroy(clnt->fidpool);
861
fea511a6
EVH		 862 p9_tag_cleanup(clnt);
863
bd238fb4
LI		 864 kfree(clnt);
865}
866EXPORT_SYMBOL(p9_client_destroy);
867
868void p9_client_disconnect(struct p9_client *clnt)
869{
870 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
8b81ef58 871 clnt->status = Disconnected;
bd238fb4
LI		 872}
873EXPORT_SYMBOL(p9_client_disconnect);
874
6d96d3ab
AK		 875void p9_client_begin_disconnect(struct p9_client *clnt)
876{
877 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
878 clnt->status = BeginDisconnect;
879}
880EXPORT_SYMBOL(p9_client_begin_disconnect);
881
bd238fb4 882struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
ba17674f 883 char *uname, u32 n_uname, char *aname)
bd238fb4
LI		 884{
885 int err;
51a87c55 886 struct p9_req_t *req;
bd238fb4 887 struct p9_fid *fid;
51a87c55 888 struct p9_qid qid;
bd238fb4 889
51a87c55
EVH		 890 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
891 afid ? afid->fid : -1, uname, aname);
bd238fb4 892 err = 0;
bd238fb4
LI		 893
894 fid = p9_fid_create(clnt);
895 if (IS_ERR(fid)) {
896 err = PTR_ERR(fid);
897 fid = NULL;
898 goto error;
899 }
900
51a87c55
EVH		 901 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
902 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
903 if (IS_ERR(req)) {
904 err = PTR_ERR(req);
bd238fb4
LI		 905 goto error;
906 }
907
342fee1d 908 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
51a87c55 909 if (err) {
e7f4b8f1 910 p9pdu_dump(1, req->rc);
51a87c55 911 p9_free_req(clnt, req);
bd238fb4 912 goto error;
51a87c55 913 }
bd238fb4 914
51a87c55 915 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
b0d5fdef
RD		 916 qid.type,
917 (unsigned long long)qid.path,
918 qid.version);
51a87c55
EVH		 919
920 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
921
922 p9_free_req(clnt, req);
bd238fb4
LI		 923 return fid;
924
925error:
bd238fb4
LI		 926 if (fid)
927 p9_fid_destroy(fid);
928 return ERR_PTR(err);
929}
930EXPORT_SYMBOL(p9_client_attach);
931
b76225e2
HPB		 932struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
933 char **wnames, int clone)
bd238fb4
LI		 934{
935 int err;
bd238fb4
LI		 936 struct p9_client *clnt;
937 struct p9_fid *fid;
51a87c55
EVH		 938 struct p9_qid *wqids;
939 struct p9_req_t *req;
b76225e2 940 uint16_t nwqids, count;
bd238fb4 941
bd238fb4 942 err = 0;
62b2be59 943 wqids = NULL;
bd238fb4
LI		 944 clnt = oldfid->clnt;
945 if (clone) {
946 fid = p9_fid_create(clnt);
947 if (IS_ERR(fid)) {
948 err = PTR_ERR(fid);
949 fid = NULL;
950 goto error;
951 }
952
953 fid->uid = oldfid->uid;
954 } else
955 fid = oldfid;
956
51a87c55 957
b76225e2 958 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
51a87c55
EVH		 959 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
960
961 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
962 nwname, wnames);
963 if (IS_ERR(req)) {
964 err = PTR_ERR(req);
bd238fb4
LI		 965 goto error;
966 }
967
342fee1d 968 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
e7f4b8f1
EVH		 969 if (err) {
970 p9pdu_dump(1, req->rc);
971 p9_free_req(clnt, req);
51a87c55 972 goto clunk_fid;
e7f4b8f1
EVH		 973 }
974 p9_free_req(clnt, req);
bd238fb4 975
51a87c55
EVH		 976 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
977
978 if (nwqids != nwname) {
bd238fb4
LI		 979 err = -ENOENT;
980 goto clunk_fid;
981 }
982
51a87c55
EVH		 983 for (count = 0; count < nwqids; count++)
984 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
b0d5fdef
RD		 985 count, wqids[count].type,
986 (unsigned long long)wqids[count].path,
51a87c55
EVH		 987 wqids[count].version);
988
bd238fb4 989 if (nwname)
51a87c55 990 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
bd238fb4
LI		 991 else
992 fid->qid = oldfid->qid;
993
62b2be59 994 kfree(wqids);
bd238fb4
LI		 995 return fid;
996
997clunk_fid:
62b2be59 998 kfree(wqids);
51a87c55
EVH		 999 p9_client_clunk(fid);
1000 fid = NULL;
bd238fb4
LI		 1001
1002error:
bd238fb4
LI		 1003 if (fid && (fid != oldfid))
1004 p9_fid_destroy(fid);
1005
1006 return ERR_PTR(err);
1007}
1008EXPORT_SYMBOL(p9_client_walk);
1009
1010int p9_client_open(struct p9_fid *fid, int mode)
1011{
1012 int err;
bd238fb4 1013 struct p9_client *clnt;
51a87c55
EVH		 1014 struct p9_req_t *req;
1015 struct p9_qid qid;
1016 int iounit;
bd238fb4 1017
bd238fb4 1018 clnt = fid->clnt;
ef56547e
MK		 1019 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1020 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1021 err = 0;
bd238fb4
LI		 1022
1023 if (fid->mode != -1)
1024 return -EINVAL;
1025
ef56547e
MK		 1026 if (p9_is_proto_dotl(clnt))
1027 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1028 else
1029 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
51a87c55
EVH		 1030 if (IS_ERR(req)) {
1031 err = PTR_ERR(req);
1032 goto error;
bd238fb4
LI		 1033 }
1034
342fee1d 1035 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
e7f4b8f1
EVH		 1036 if (err) {
1037 p9pdu_dump(1, req->rc);
1038 goto free_and_error;
1039 }
51a87c55 1040
ef56547e
MK		 1041 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1042 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1043 (unsigned long long)qid.path, qid.version, iounit);
bd238fb4
LI		 1044
1045 fid->mode = mode;
51a87c55 1046 fid->iounit = iounit;
bd238fb4 1047
e7f4b8f1
EVH		 1048free_and_error:
1049 p9_free_req(clnt, req);
51a87c55 1050error:
bd238fb4
LI		 1051 return err;
1052}
1053EXPORT_SYMBOL(p9_client_open);
1054
5643135a
VJJ		 1055int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1056 gid_t gid, struct p9_qid *qid)
1057{
1058 int err = 0;
1059 struct p9_client *clnt;
1060 struct p9_req_t *req;
1061 int iounit;
1062
1063 P9_DPRINTK(P9_DEBUG_9P,
1064 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1065 ofid->fid, name, flags, mode, gid);
1066 clnt = ofid->clnt;
1067
1068 if (ofid->mode != -1)
1069 return -EINVAL;
1070
1071 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1072 mode, gid);
1073 if (IS_ERR(req)) {
1074 err = PTR_ERR(req);
1075 goto error;
1076 }
1077
1078 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1079 if (err) {
1080 p9pdu_dump(1, req->rc);
1081 goto free_and_error;
1082 }
1083
1084 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1085 qid->type,
1086 (unsigned long long)qid->path,
1087 qid->version, iounit);
1088
1089 ofid->mode = mode;
1090 ofid->iounit = iounit;
1091
1092free_and_error:
1093 p9_free_req(clnt, req);
1094error:
1095 return err;
1096}
1097EXPORT_SYMBOL(p9_client_create_dotl);
1098
bd238fb4
LI		 1099int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1100 char *extension)
1101{
1102 int err;
bd238fb4 1103 struct p9_client *clnt;
51a87c55
EVH		 1104 struct p9_req_t *req;
1105 struct p9_qid qid;
1106 int iounit;
bd238fb4 1107
51a87c55
EVH		 1108 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1109 fid->fid, name, perm, mode);
bd238fb4 1110 err = 0;
bd238fb4
LI		 1111 clnt = fid->clnt;
1112
1113 if (fid->mode != -1)
1114 return -EINVAL;
1115
51a87c55
EVH		 1116 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1117 mode, extension);
1118 if (IS_ERR(req)) {
1119 err = PTR_ERR(req);
1120 goto error;
bd238fb4
LI		 1121 }
1122
342fee1d 1123 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
e7f4b8f1
EVH		 1124 if (err) {
1125 p9pdu_dump(1, req->rc);
1126 goto free_and_error;
1127 }
51a87c55
EVH		 1128
1129 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
b0d5fdef
RD		 1130 qid.type,
1131 (unsigned long long)qid.path,
1132 qid.version, iounit);
bd238fb4
LI		 1133
1134 fid->mode = mode;
51a87c55 1135 fid->iounit = iounit;
bd238fb4 1136
e7f4b8f1
EVH		 1137free_and_error:
1138 p9_free_req(clnt, req);
51a87c55 1139error:
bd238fb4
LI		 1140 return err;
1141}
1142EXPORT_SYMBOL(p9_client_fcreate);
1143
50cc42ff
VJJ		 1144int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1145 struct p9_qid *qid)
1146{
1147 int err = 0;
1148 struct p9_client *clnt;
1149 struct p9_req_t *req;
1150
1151 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1152 dfid->fid, name, symtgt);
1153 clnt = dfid->clnt;
1154
1155 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1156 gid);
1157 if (IS_ERR(req)) {
1158 err = PTR_ERR(req);
1159 goto error;
1160 }
1161
1162 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1163 if (err) {
1164 p9pdu_dump(1, req->rc);
1165 goto free_and_error;
1166 }
1167
1168 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1169 qid->type, (unsigned long long)qid->path, qid->version);
1170
1171free_and_error:
1172 p9_free_req(clnt, req);
1173error:
1174 return err;
1175}
1176EXPORT_SYMBOL(p9_client_symlink);
1177
652df9a7
VJJ		 1178int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1179{
1180 struct p9_client *clnt;
1181 struct p9_req_t *req;
1182
1183 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1184 dfid->fid, oldfid->fid, newname);
1185 clnt = dfid->clnt;
1186 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1187 newname);
1188 if (IS_ERR(req))
1189 return PTR_ERR(req);
1190
1191 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1192 p9_free_req(clnt, req);
1193 return 0;
1194}
1195EXPORT_SYMBOL(p9_client_link);
1196
b165d601 1197int p9_client_fsync(struct p9_fid *fid, int datasync)
920e65dc
VJJ		 1198{
1199 int err;
1200 struct p9_client *clnt;
1201 struct p9_req_t *req;
1202
b165d601
VJJ		 1203 P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1204 fid->fid, datasync);
920e65dc
VJJ		 1205 err = 0;
1206 clnt = fid->clnt;
1207
b165d601 1208 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
920e65dc
VJJ		 1209 if (IS_ERR(req)) {
1210 err = PTR_ERR(req);
1211 goto error;
1212 }
1213
1214 P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1215
1216 p9_free_req(clnt, req);
1217
1218error:
1219 return err;
1220}
1221EXPORT_SYMBOL(p9_client_fsync);
1222
bd238fb4
LI		 1223int p9_client_clunk(struct p9_fid *fid)
1224{
1225 int err;
bd238fb4 1226 struct p9_client *clnt;
51a87c55 1227 struct p9_req_t *req;
bd238fb4 1228
8e44a080 1229 if (!fid) {
1230 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1231 dump_stack();
1232 return 0;
1233 }
1234
51a87c55 1235 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
bd238fb4 1236 err = 0;
bd238fb4
LI		 1237 clnt = fid->clnt;
1238
51a87c55
EVH		 1239 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1240 if (IS_ERR(req)) {
1241 err = PTR_ERR(req);
1242 goto error;
bd238fb4
LI		 1243 }
1244
51a87c55 1245 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
bd238fb4 1246
51a87c55 1247 p9_free_req(clnt, req);
bd238fb4
LI		 1248 p9_fid_destroy(fid);
1249
51a87c55 1250error:
bd238fb4
LI		 1251 return err;
1252}
1253EXPORT_SYMBOL(p9_client_clunk);
1254
1255int p9_client_remove(struct p9_fid *fid)
1256{
1257 int err;
bd238fb4 1258 struct p9_client *clnt;
51a87c55 1259 struct p9_req_t *req;
bd238fb4 1260
51a87c55 1261 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
bd238fb4 1262 err = 0;
bd238fb4
LI		 1263 clnt = fid->clnt;
1264
51a87c55
EVH		 1265 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1266 if (IS_ERR(req)) {
1267 err = PTR_ERR(req);
1268 goto error;
bd238fb4
LI		 1269 }
1270
51a87c55 1271 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
bd238fb4 1272
51a87c55 1273 p9_free_req(clnt, req);
51a87c55 1274error:
0b1208b1 1275 p9_fid_destroy(fid);
bd238fb4
LI		 1276 return err;
1277}
1278EXPORT_SYMBOL(p9_client_remove);
1279
0fc9655e
EVH		 1280int
1281p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1282 u32 count)
bd238fb4 1283{
095d3da6 1284 int err, rsize;
bd238fb4 1285 struct p9_client *clnt;
51a87c55
EVH		 1286 struct p9_req_t *req;
1287 char *dataptr;
bd238fb4 1288
51a87c55 1289 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
bd238fb4
LI		 1290 (long long unsigned) offset, count);
1291 err = 0;
bd238fb4 1292 clnt = fid->clnt;
bd238fb4
LI		 1293
1294 rsize = fid->iounit;
1295 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1296 rsize = clnt->msize - P9_IOHDRSZ;
1297
51a87c55
EVH		 1298 if (count < rsize)
1299 rsize = count;
bd238fb4 1300
bb2f8a55
VJJ		 1301 /* Don't bother zerocopy form small IO (< 1024) */
1302 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1303 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
1304 req = p9_client_rpc(clnt, P9_TREAD, "dqE", fid->fid, offset,
1305 rsize, data, udata);
1306 } else {
1307 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1308 rsize);
1309 }
51a87c55
EVH		 1310 if (IS_ERR(req)) {
1311 err = PTR_ERR(req);
1312 goto error;
1313 }
bd238fb4 1314
342fee1d 1315 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
e7f4b8f1
EVH		 1316 if (err) {
1317 p9pdu_dump(1, req->rc);
51a87c55 1318 goto free_and_error;
e7f4b8f1 1319 }
bd238fb4 1320
51a87c55 1321 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
bd238fb4 1322
bb2f8a55
VJJ		 1323 if (!req->tc->pbuf_size) {
1324 if (data) {
1325 memmove(data, dataptr, count);
1326 } else {
1327 err = copy_to_user(udata, dataptr, count);
1328 if (err) {
1329 err = -EFAULT;
1330 goto free_and_error;
1331 }
bd238fb4 1332 }
51a87c55 1333 }
51a87c55
EVH		 1334 p9_free_req(clnt, req);
1335 return count;
bd238fb4 1336
51a87c55
EVH		 1337free_and_error:
1338 p9_free_req(clnt, req);
bd238fb4 1339error:
bd238fb4
LI		 1340 return err;
1341}
0fc9655e 1342EXPORT_SYMBOL(p9_client_read);
bd238fb4
LI		 1343
1344int
0fc9655e
EVH		 1345p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1346 u64 offset, u32 count)
bd238fb4 1347{
095d3da6 1348 int err, rsize;
bd238fb4 1349 struct p9_client *clnt;
51a87c55 1350 struct p9_req_t *req;
bd238fb4 1351
51a87c55
EVH		 1352 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1353 fid->fid, (long long unsigned) offset, count);
bd238fb4 1354 err = 0;
bd238fb4 1355 clnt = fid->clnt;
bd238fb4
LI		 1356
1357 rsize = fid->iounit;
1358 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1359 rsize = clnt->msize - P9_IOHDRSZ;
1360
51a87c55
EVH		 1361 if (count < rsize)
1362 rsize = count;
1fc52481
VJJ		 1363
1364 /* Don't bother zerocopy form small IO (< 1024) */
1365 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1366 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
1367 req = p9_client_rpc(clnt, P9_TWRITE, "dqE", fid->fid, offset,
1368 rsize, data, udata);
1369 } else {
1370
1371 if (data)
1372 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1373 offset, rsize, data);
1374 else
1375 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1376 offset, rsize, udata);
1377 }
51a87c55
EVH		 1378 if (IS_ERR(req)) {
1379 err = PTR_ERR(req);
1380 goto error;
1381 }
0fc9655e 1382
342fee1d 1383 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
e7f4b8f1
EVH		 1384 if (err) {
1385 p9pdu_dump(1, req->rc);
51a87c55 1386 goto free_and_error;
e7f4b8f1
EVH		 1387 }
1388
51a87c55 1389 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
bd238fb4 1390
51a87c55
EVH		 1391 p9_free_req(clnt, req);
1392 return count;
bd238fb4 1393
51a87c55
EVH		 1394free_and_error:
1395 p9_free_req(clnt, req);
bd238fb4 1396error:
bd238fb4
LI		 1397 return err;
1398}
0fc9655e 1399EXPORT_SYMBOL(p9_client_write);
bd238fb4 1400
51a87c55 1401struct p9_wstat *p9_client_stat(struct p9_fid *fid)
5503ac56 1402{
51a87c55
EVH		 1403 int err;
1404 struct p9_client *clnt;
1405 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1406 struct p9_req_t *req;
1407 u16 ignored;
5503ac56 1408
51a87c55 1409 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
5503ac56 1410
5503ac56
EVH		 1411 if (!ret)
1412 return ERR_PTR(-ENOMEM);
1413
bd238fb4 1414 err = 0;
bd238fb4
LI		 1415 clnt = fid->clnt;
1416
51a87c55
EVH		 1417 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1418 if (IS_ERR(req)) {
1419 err = PTR_ERR(req);
bd238fb4
LI		 1420 goto error;
1421 }
1422
342fee1d 1423 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
e7f4b8f1 1424 if (err) {
e7f4b8f1 1425 p9pdu_dump(1, req->rc);
eedfe1c4
AK		 1426 p9_free_req(clnt, req);
1427 goto error;
e7f4b8f1 1428 }
bd238fb4 1429
51a87c55 1430 P9_DPRINTK(P9_DEBUG_9P,
e7f4b8f1
EVH		 1431 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1432 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1433 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1434 "<<< uid=%d gid=%d n_muid=%d\n",
51a87c55 1435 ret->size, ret->type, ret->dev, ret->qid.type,
b0d5fdef
RD		 1436 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1437 ret->atime, ret->mtime, (unsigned long long)ret->length,
1438 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
e7f4b8f1 1439 ret->n_uid, ret->n_gid, ret->n_muid);
bd238fb4 1440
742b11a7
LI		 1441 p9_free_req(clnt, req);
1442 return ret;
1443
bd238fb4 1444error:
742b11a7
LI		 1445 kfree(ret);
1446 return ERR_PTR(err);
bd238fb4
LI		 1447}
1448EXPORT_SYMBOL(p9_client_stat);
1449
f0853122
SK		 1450struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1451 u64 request_mask)
1452{
1453 int err;
1454 struct p9_client *clnt;
1455 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1456 GFP_KERNEL);
1457 struct p9_req_t *req;
1458
1459 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1460 fid->fid, request_mask);
1461
1462 if (!ret)
1463 return ERR_PTR(-ENOMEM);
1464
1465 err = 0;
1466 clnt = fid->clnt;
1467
1468 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1469 if (IS_ERR(req)) {
1470 err = PTR_ERR(req);
1471 goto error;
1472 }
1473
1474 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1475 if (err) {
1476 p9pdu_dump(1, req->rc);
1477 p9_free_req(clnt, req);
1478 goto error;
1479 }
1480
1481 P9_DPRINTK(P9_DEBUG_9P,
1482 "<<< RGETATTR st_result_mask=%lld\n"
1483 "<<< qid=%x.%llx.%x\n"
1484 "<<< st_mode=%8.8x st_nlink=%llu\n"
1485 "<<< st_uid=%d st_gid=%d\n"
1486 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1487 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1488 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1489 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1490 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1491 "<<< st_gen=%lld st_data_version=%lld",
1492 ret->st_result_mask, ret->qid.type, ret->qid.path,
1493 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1494 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1495 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1496 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1497 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1498 ret->st_gen, ret->st_data_version);
1499
1500 p9_free_req(clnt, req);
1501 return ret;
1502
1503error:
1504 kfree(ret);
1505 return ERR_PTR(err);
1506}
1507EXPORT_SYMBOL(p9_client_getattr_dotl);
1508
342fee1d 1509static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
453ed90d
LI		 1510{
1511 int ret;
1512
9d6939da 1513 /* NOTE: size shouldn't include its own length */
453ed90d
LI		 1514 /* size[2] type[2] dev[4] qid[13] */
1515 /* mode[4] atime[4] mtime[4] length[8]*/
1516 /* name[s] uid[s] gid[s] muid[s] */
9d6939da 1517 ret = 2+4+13+4+4+4+8+2+2+2+2;
453ed90d
LI		 1518
1519 if (wst->name)
1520 ret += strlen(wst->name);
1521 if (wst->uid)
1522 ret += strlen(wst->uid);
1523 if (wst->gid)
1524 ret += strlen(wst->gid);
1525 if (wst->muid)
1526 ret += strlen(wst->muid);
1527
c56e4acf
SK		 1528 if ((proto_version == p9_proto_2000u) ||
1529 (proto_version == p9_proto_2000L)) {
453ed90d
LI		 1530 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1531 if (wst->extension)
1532 ret += strlen(wst->extension);
1533 }
1534
1535 return ret;
1536}
1537
bd238fb4
LI		 1538int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1539{
1540 int err;
51a87c55 1541 struct p9_req_t *req;
bd238fb4
LI		 1542 struct p9_client *clnt;
1543
453ed90d
LI		 1544 err = 0;
1545 clnt = fid->clnt;
342fee1d 1546 wst->size = p9_client_statsize(wst, clnt->proto_version);
51a87c55 1547 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
e7f4b8f1
EVH		 1548 P9_DPRINTK(P9_DEBUG_9P,
1549 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1550 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1551 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1552 " uid=%d gid=%d n_muid=%d\n",
1553 wst->size, wst->type, wst->dev, wst->qid.type,
b0d5fdef
RD		 1554 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1555 wst->atime, wst->mtime, (unsigned long long)wst->length,
1556 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
e7f4b8f1 1557 wst->n_uid, wst->n_gid, wst->n_muid);
bd238fb4 1558
9d6939da 1559 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
51a87c55
EVH		 1560 if (IS_ERR(req)) {
1561 err = PTR_ERR(req);
1562 goto error;
bd238fb4
LI		 1563 }
1564
51a87c55 1565 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
bd238fb4 1566
51a87c55
EVH		 1567 p9_free_req(clnt, req);
1568error:
bd238fb4
LI		 1569 return err;
1570}
1571EXPORT_SYMBOL(p9_client_wstat);
bda8e775 1572
87d7845a
SK		 1573int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1574{
1575 int err;
1576 struct p9_req_t *req;
1577 struct p9_client *clnt;
1578
1579 err = 0;
1580 clnt = fid->clnt;
1581 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1582 P9_DPRINTK(P9_DEBUG_9P,
1583 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1584 " atime_sec=%lld atime_nsec=%lld\n"
1585 " mtime_sec=%lld mtime_nsec=%lld\n",
1586 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1587 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1588 p9attr->mtime_sec, p9attr->mtime_nsec);
1589
1590 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1591
1592 if (IS_ERR(req)) {
1593 err = PTR_ERR(req);
1594 goto error;
1595 }
1596 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1597 p9_free_req(clnt, req);
1598error:
1599 return err;
1600}
1601EXPORT_SYMBOL(p9_client_setattr);
1602
bda8e775
SK		 1603int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1604{
1605 int err;
1606 struct p9_req_t *req;
1607 struct p9_client *clnt;
1608
1609 err = 0;
1610 clnt = fid->clnt;
1611
1612 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1613
1614 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1615 if (IS_ERR(req)) {
1616 err = PTR_ERR(req);
1617 goto error;
1618 }
1619
1620 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1621 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1622 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1623 if (err) {
1624 p9pdu_dump(1, req->rc);
1625 p9_free_req(clnt, req);
1626 goto error;
1627 }
1628
1629 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1630 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1631 "fsid %llu namelen %ld\n",
1632 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1633 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1634 sb->fsid, (long int)sb->namelen);
1635
1636 p9_free_req(clnt, req);
1637error:
1638 return err;
1639}
1640EXPORT_SYMBOL(p9_client_statfs);
4681dbda
SK		 1641
1642int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name)
1643{
1644 int err;
1645 struct p9_req_t *req;
1646 struct p9_client *clnt;
1647
1648 err = 0;
1649 clnt = fid->clnt;
1650
1651 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1652 fid->fid, newdirfid->fid, name);
1653
1654 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1655 newdirfid->fid, name);
1656 if (IS_ERR(req)) {
1657 err = PTR_ERR(req);
1658 goto error;
1659 }
1660
1661 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1662
1663 p9_free_req(clnt, req);
1664error:
1665 return err;
1666}
1667EXPORT_SYMBOL(p9_client_rename);
1668
0ef63f34
AK		 1669/*
1670 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1671 */
1672struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1673 const char *attr_name, u64 *attr_size)
1674{
1675 int err;
1676 struct p9_req_t *req;
1677 struct p9_client *clnt;
1678 struct p9_fid *attr_fid;
1679
1680 err = 0;
1681 clnt = file_fid->clnt;
1682 attr_fid = p9_fid_create(clnt);
1683 if (IS_ERR(attr_fid)) {
1684 err = PTR_ERR(attr_fid);
1685 attr_fid = NULL;
1686 goto error;
1687 }
1688 P9_DPRINTK(P9_DEBUG_9P,
1689 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1690 file_fid->fid, attr_fid->fid, attr_name);
1691
1692 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1693 file_fid->fid, attr_fid->fid, attr_name);
1694 if (IS_ERR(req)) {
1695 err = PTR_ERR(req);
1696 goto error;
1697 }
1698 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1699 if (err) {
1700 p9pdu_dump(1, req->rc);
1701 p9_free_req(clnt, req);
1702 goto clunk_fid;
1703 }
1704 p9_free_req(clnt, req);
1705 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1706 attr_fid->fid, *attr_size);
1707 return attr_fid;
1708clunk_fid:
1709 p9_client_clunk(attr_fid);
1710 attr_fid = NULL;
1711error:
1712 if (attr_fid && (attr_fid != file_fid))
1713 p9_fid_destroy(attr_fid);
1714
1715 return ERR_PTR(err);
1716}
1717EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1718
eda25e46
AK		 1719int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1720 u64 attr_size, int flags)
1721{
1722 int err;
1723 struct p9_req_t *req;
1724 struct p9_client *clnt;
1725
1726 P9_DPRINTK(P9_DEBUG_9P,
1727 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
1728 fid->fid, name, (long long)attr_size, flags);
1729 err = 0;
1730 clnt = fid->clnt;
1731 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1732 fid->fid, name, attr_size, flags);
1733 if (IS_ERR(req)) {
1734 err = PTR_ERR(req);
1735 goto error;
1736 }
1737 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
1738 p9_free_req(clnt, req);
1739error:
1740 return err;
1741}
1742EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
1743
7751bdb3
SK		 1744int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
1745{
095d3da6 1746 int err, rsize;
7751bdb3
SK		 1747 struct p9_client *clnt;
1748 struct p9_req_t *req;
1749 char *dataptr;
1750
1751 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
1752 fid->fid, (long long unsigned) offset, count);
1753
1754 err = 0;
1755 clnt = fid->clnt;
7751bdb3
SK		 1756
1757 rsize = fid->iounit;
1758 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
1759 rsize = clnt->msize - P9_READDIRHDRSZ;
1760
1761 if (count < rsize)
1762 rsize = count;
1763
2c66523f
VJJ		 1764 if ((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1765 P9_TRANS_PREF_PAYLOAD_SEP) {
1766 req = p9_client_rpc(clnt, P9_TREADDIR, "dqF", fid->fid,
1767 offset, rsize, data);
1768 } else {
1769 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
1770 offset, rsize);
1771 }
7751bdb3
SK		 1772 if (IS_ERR(req)) {
1773 err = PTR_ERR(req);
1774 goto error;
1775 }
1776
1777 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1778 if (err) {
1779 p9pdu_dump(1, req->rc);
1780 goto free_and_error;
1781 }
1782
1783 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
1784
2c66523f 1785 if (!req->tc->pbuf_size && data)
7751bdb3
SK		 1786 memmove(data, dataptr, count);
1787
1788 p9_free_req(clnt, req);
1789 return count;
1790
1791free_and_error:
1792 p9_free_req(clnt, req);
1793error:
1794 return err;
1795}
1796EXPORT_SYMBOL(p9_client_readdir);
4b43516a
MK		 1797
1798int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
1799 dev_t rdev, gid_t gid, struct p9_qid *qid)
1800{
1801 int err;
1802 struct p9_client *clnt;
1803 struct p9_req_t *req;
1804
1805 err = 0;
1806 clnt = fid->clnt;
1807 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
1808 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
1809 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
1810 MAJOR(rdev), MINOR(rdev), gid);
1811 if (IS_ERR(req))
1812 return PTR_ERR(req);
1813
1814 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1815 if (err) {
1816 p9pdu_dump(1, req->rc);
1817 goto error;
1818 }
1819 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
1820 (unsigned long long)qid->path, qid->version);
1821
1822error:
1823 p9_free_req(clnt, req);
1824 return err;
1825
1826}
1827EXPORT_SYMBOL(p9_client_mknod_dotl);
01a622bd
MK		 1828
1829int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
1830 gid_t gid, struct p9_qid *qid)
1831{
1832 int err;
1833 struct p9_client *clnt;
1834 struct p9_req_t *req;
1835
1836 err = 0;
1837 clnt = fid->clnt;
1838 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
1839 fid->fid, name, mode, gid);
1840 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
1841 gid);
1842 if (IS_ERR(req))
1843 return PTR_ERR(req);
1844
1845 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1846 if (err) {
1847 p9pdu_dump(1, req->rc);
1848 goto error;
1849 }
1850 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
1851 (unsigned long long)qid->path, qid->version);
1852
1853error:
1854 p9_free_req(clnt, req);
1855 return err;
1856
1857}
1858EXPORT_SYMBOL(p9_client_mkdir_dotl);
a099027c
MK		 1859
1860int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
1861{
1862 int err;
1863 struct p9_client *clnt;
1864 struct p9_req_t *req;
1865
1866 err = 0;
1867 clnt = fid->clnt;
1868 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
1869 "start %lld length %lld proc_id %d client_id %s\n",
1870 fid->fid, flock->type, flock->flags, flock->start,
1871 flock->length, flock->proc_id, flock->client_id);
1872
1873 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
1874 flock->flags, flock->start, flock->length,
1875 flock->proc_id, flock->client_id);
1876
1877 if (IS_ERR(req))
1878 return PTR_ERR(req);
1879
1880 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
1881 if (err) {
1882 p9pdu_dump(1, req->rc);
1883 goto error;
1884 }
1885 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
1886error:
1887 p9_free_req(clnt, req);
1888 return err;
1889
1890}
1891EXPORT_SYMBOL(p9_client_lock_dotl);
1d769cd1
MK		 1892
1893int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
1894{
1895 int err;
1896 struct p9_client *clnt;
1897 struct p9_req_t *req;
1898
1899 err = 0;
1900 clnt = fid->clnt;
1901 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
1902 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
1903 glock->start, glock->length, glock->proc_id, glock->client_id);
1904
1905 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
1906 glock->start, glock->length, glock->proc_id, glock->client_id);
1907
1908 if (IS_ERR(req))
1909 return PTR_ERR(req);
1910
1911 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
1912 &glock->start, &glock->length, &glock->proc_id,
1913 &glock->client_id);
1914 if (err) {
1915 p9pdu_dump(1, req->rc);
1916 goto error;
1917 }
1918 P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
1919 "proc_id %d client_id %s\n", glock->type, glock->start,
1920 glock->length, glock->proc_id, glock->client_id);
1921error:
1922 p9_free_req(clnt, req);
1923 return err;
1924}
1925EXPORT_SYMBOL(p9_client_getlock_dotl);
329176cc
MK		 1926
1927int p9_client_readlink(struct p9_fid *fid, char **target)
1928{
1929 int err;
1930 struct p9_client *clnt;
1931 struct p9_req_t *req;
1932
1933 err = 0;
1934 clnt = fid->clnt;
1935 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
1936
1937 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
1938 if (IS_ERR(req))
1939 return PTR_ERR(req);
1940
1941 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
1942 if (err) {
1943 p9pdu_dump(1, req->rc);
1944 goto error;
1945 }
1946 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
1947error:
1948 p9_free_req(clnt, req);
1949 return err;
1950}
1951EXPORT_SYMBOL(p9_client_readlink);
Linux 6.x block layer and io_uring tree(s)