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Merge tag 'omap-late-cleanups' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[deliverable/linux.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
5d385153
JP		 26#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
bd238fb4
LI		 28#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/fs.h>
8a0dc95f 31#include <linux/poll.h>
bd238fb4
LI		 32#include <linux/idr.h>
33#include <linux/mutex.h>
5a0e3ad6 34#include <linux/slab.h>
bd238fb4
LI		 35#include <linux/sched.h>
36#include <linux/uaccess.h>
37#include <net/9p/9p.h>
fb0466c3 38#include <linux/parser.h>
bd238fb4 39#include <net/9p/client.h>
8b81ef58 40#include <net/9p/transport.h>
51a87c55 41#include "protocol.h"
bd238fb4 42
348b5901
AK		 43#define CREATE_TRACE_POINTS
44#include <trace/events/9p.h>
45
8a0dc95f
EVH		 46/*
47 * Client Option Parsing (code inspired by NFS code)
48 * - a little lazy - parse all client options
49 */
50
51enum {
52 Opt_msize,
53 Opt_trans,
54 Opt_legacy,
0fb80abd 55 Opt_version,
8a0dc95f
EVH		 56 Opt_err,
57};
58
a447c093 59static const match_table_t tokens = {
8a0dc95f
EVH		 60 {Opt_msize, "msize=%u"},
61 {Opt_legacy, "noextend"},
62 {Opt_trans, "trans=%s"},
0fb80abd 63 {Opt_version, "version=%s"},
8a0dc95f
EVH		 64 {Opt_err, NULL},
65};
66
342fee1d
SK		 67inline int p9_is_proto_dotl(struct p9_client *clnt)
68{
a02cec21 69 return clnt->proto_version == p9_proto_2000L;
342fee1d
SK		 70}
71EXPORT_SYMBOL(p9_is_proto_dotl);
72
73inline int p9_is_proto_dotu(struct p9_client *clnt)
74{
a02cec21 75 return clnt->proto_version == p9_proto_2000u;
342fee1d
SK		 76}
77EXPORT_SYMBOL(p9_is_proto_dotu);
78
43def35c
SD		 79/*
80 * Some error codes are taken directly from the server replies,
81 * make sure they are valid.
82 */
83static int safe_errno(int err)
84{
85 if ((err > 0) || (err < -MAX_ERRNO)) {
86 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
87 return -EPROTO;
88 }
89 return err;
90}
91
92
0fb80abd 93/* Interpret mount option for protocol version */
4d63055f 94static int get_protocol_version(char *s)
0fb80abd 95{
3dc9fef6
DC		 96 int version = -EINVAL;
97
4d63055f 98 if (!strcmp(s, "9p2000")) {
0fb80abd 99 version = p9_proto_legacy;
5d385153 100 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
4d63055f 101 } else if (!strcmp(s, "9p2000.u")) {
0fb80abd 102 version = p9_proto_2000u;
5d385153 103 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
4d63055f 104 } else if (!strcmp(s, "9p2000.L")) {
45bc21ed 105 version = p9_proto_2000L;
5d385153 106 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
4d63055f 107 } else
5d385153 108 pr_info("Unknown protocol version %s\n", s);
4d63055f 109
0fb80abd
SK		 110 return version;
111}
112
8a0dc95f 113/**
0e15597e
AK		 114 * parse_options - parse mount options into client structure
115 * @opts: options string passed from mount
116 * @clnt: existing v9fs client information
8a0dc95f 117 *
bb8ffdfc 118 * Return 0 upon success, -ERRNO upon failure
8a0dc95f
EVH		 119 */
120
bb8ffdfc 121static int parse_opts(char *opts, struct p9_client *clnt)
8a0dc95f 122{
d8c8a9e3 123 char *options, *tmp_options;
8a0dc95f
EVH		 124 char *p;
125 substring_t args[MAX_OPT_ARGS];
126 int option;
4d63055f 127 char *s;
bb8ffdfc 128 int ret = 0;
8a0dc95f 129
342fee1d 130 clnt->proto_version = p9_proto_2000u;
8a0dc95f
EVH		 131 clnt->msize = 8192;
132
bb8ffdfc
EVH		 133 if (!opts)
134 return 0;
135
d8c8a9e3
EVH		 136 tmp_options = kstrdup(opts, GFP_KERNEL);
137 if (!tmp_options) {
5d385153
JP		 138 p9_debug(P9_DEBUG_ERROR,
139 "failed to allocate copy of option string\n");
bb8ffdfc
EVH		 140 return -ENOMEM;
141 }
d8c8a9e3 142 options = tmp_options;
8a0dc95f
EVH		 143
144 while ((p = strsep(&options, ",")) != NULL) {
4d5077f1 145 int token, r;
8a0dc95f
EVH		 146 if (!*p)
147 continue;
148 token = match_token(p, tokens, args);
4d5077f1
AK		 149 switch (token) {
150 case Opt_msize:
151 r = match_int(&args[0], &option);
bb8ffdfc 152 if (r < 0) {
5d385153
JP		 153 p9_debug(P9_DEBUG_ERROR,
154 "integer field, but no integer?\n");
bb8ffdfc 155 ret = r;
8a0dc95f
EVH		 156 continue;
157 }
8a0dc95f
EVH		 158 clnt->msize = option;
159 break;
160 case Opt_trans:
4d63055f
PK		 161 s = match_strdup(&args[0]);
162 if (!s) {
163 ret = -ENOMEM;
5d385153
JP		 164 p9_debug(P9_DEBUG_ERROR,
165 "problem allocating copy of trans arg\n");
4d63055f
PK		 166 goto free_and_return;
167 }
168 clnt->trans_mod = v9fs_get_trans_by_name(s);
169 if (clnt->trans_mod == NULL) {
5d385153
JP		 170 pr_info("Could not find request transport: %s\n",
171 s);
349d3bb8 172 ret = -EINVAL;
4d63055f 173 kfree(s);
349d3bb8
EVH		 174 goto free_and_return;
175 }
4d63055f 176 kfree(s);
8a0dc95f
EVH		 177 break;
178 case Opt_legacy:
342fee1d 179 clnt->proto_version = p9_proto_legacy;
8a0dc95f 180 break;
0fb80abd 181 case Opt_version:
4d63055f
PK		 182 s = match_strdup(&args[0]);
183 if (!s) {
184 ret = -ENOMEM;
5d385153
JP		 185 p9_debug(P9_DEBUG_ERROR,
186 "problem allocating copy of version arg\n");
0fb80abd 187 goto free_and_return;
4d63055f
PK		 188 }
189 ret = get_protocol_version(s);
190 if (ret == -EINVAL) {
191 kfree(s);
192 goto free_and_return;
193 }
194 kfree(s);
0fb80abd
SK		 195 clnt->proto_version = ret;
196 break;
8a0dc95f
EVH		 197 default:
198 continue;
199 }
200 }
72029fe8 201
349d3bb8 202free_and_return:
d8c8a9e3 203 kfree(tmp_options);
bb8ffdfc 204 return ret;
8a0dc95f
EVH		 205}
206
fea511a6
EVH		 207/**
208 * p9_tag_alloc - lookup/allocate a request by tag
209 * @c: client session to lookup tag within
210 * @tag: numeric id for transaction
211 *
212 * this is a simple array lookup, but will grow the
25985edc 213 * request_slots as necessary to accommodate transaction
fea511a6
EVH		 214 * ids which did not previously have a slot.
215 *
216 * this code relies on the client spinlock to manage locks, its
217 * possible we should switch to something else, but I'd rather
218 * stick with something low-overhead for the common case.
219 *
220 */
221
ef6b0807
DC		 222static struct p9_req_t *
223p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
fea511a6
EVH		 224{
225 unsigned long flags;
226 int row, col;
51a87c55 227 struct p9_req_t *req;
abfa034e 228 int alloc_msize = min(c->msize, max_size);
fea511a6
EVH		 229
230 /* This looks up the original request by tag so we know which
231 * buffer to read the data into */
232 tag++;
233
234 if (tag >= c->max_tag) {
235 spin_lock_irqsave(&c->lock, flags);
236 /* check again since original check was outside of lock */
237 while (tag >= c->max_tag) {
238 row = (tag / P9_ROW_MAXTAG);
239 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
240 sizeof(struct p9_req_t), GFP_ATOMIC);
241
242 if (!c->reqs[row]) {
5d385153 243 pr_err("Couldn't grow tag array\n");
e45c5405 244 spin_unlock_irqrestore(&c->lock, flags);
51a87c55 245 return ERR_PTR(-ENOMEM);
fea511a6
EVH		 246 }
247 for (col = 0; col < P9_ROW_MAXTAG; col++) {
248 c->reqs[row][col].status = REQ_STATUS_IDLE;
51a87c55 249 c->reqs[row][col].tc = NULL;
fea511a6
EVH		 250 }
251 c->max_tag += P9_ROW_MAXTAG;
252 }
253 spin_unlock_irqrestore(&c->lock, flags);
254 }
255 row = tag / P9_ROW_MAXTAG;
256 col = tag % P9_ROW_MAXTAG;
257
51a87c55
EVH		 258 req = &c->reqs[row][col];
259 if (!req->tc) {
eeff66ef 260 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
51a87c55 261 if (!req->wq) {
5d385153 262 pr_err("Couldn't grow tag array\n");
51a87c55
EVH		 263 return ERR_PTR(-ENOMEM);
264 }
265 init_waitqueue_head(req->wq);
abfa034e
AK		 266 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
267 GFP_NOFS);
abfa034e
AK		 268 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
269 GFP_NOFS);
51a87c55 270 if ((!req->tc) || (!req->rc)) {
5d385153 271 pr_err("Couldn't grow tag array\n");
51a87c55
EVH		 272 kfree(req->tc);
273 kfree(req->rc);
45abdf1c
TT		 274 kfree(req->wq);
275 req->tc = req->rc = NULL;
276 req->wq = NULL;
51a87c55
EVH		 277 return ERR_PTR(-ENOMEM);
278 }
5635fd0c
DC		 279 req->tc->capacity = alloc_msize;
280 req->rc->capacity = alloc_msize;
51a87c55 281 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
51a87c55 282 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
51a87c55
EVH		 283 }
284
285 p9pdu_reset(req->tc);
286 p9pdu_reset(req->rc);
287
51a87c55
EVH		 288 req->tc->tag = tag-1;
289 req->status = REQ_STATUS_ALLOC;
fea511a6
EVH		 290
291 return &c->reqs[row][col];
292}
fea511a6
EVH		 293
294/**
295 * p9_tag_lookup - lookup a request by tag
296 * @c: client session to lookup tag within
297 * @tag: numeric id for transaction
298 *
299 */
300
301struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
302{
303 int row, col;
304
305 /* This looks up the original request by tag so we know which
306 * buffer to read the data into */
307 tag++;
308
b85f7d92
EVH		 309 if(tag >= c->max_tag)
310 return NULL;
fea511a6
EVH		 311
312 row = tag / P9_ROW_MAXTAG;
313 col = tag % P9_ROW_MAXTAG;
314
315 return &c->reqs[row][col];
316}
317EXPORT_SYMBOL(p9_tag_lookup);
318
319/**
320 * p9_tag_init - setup tags structure and contents
0e15597e 321 * @c: v9fs client struct
fea511a6
EVH		 322 *
323 * This initializes the tags structure for each client instance.
324 *
325 */
326
327static int p9_tag_init(struct p9_client *c)
328{
329 int err = 0;
330
331 c->tagpool = p9_idpool_create();
332 if (IS_ERR(c->tagpool)) {
333 err = PTR_ERR(c->tagpool);
fea511a6
EVH		 334 goto error;
335 }
fe1cbaba
AK		 336 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
337 if (err < 0) {
338 p9_idpool_destroy(c->tagpool);
339 goto error;
340 }
fea511a6
EVH		 341 c->max_tag = 0;
342error:
343 return err;
344}
345
346/**
347 * p9_tag_cleanup - cleans up tags structure and reclaims resources
0e15597e 348 * @c: v9fs client struct
fea511a6
EVH		 349 *
350 * This frees resources associated with the tags structure
351 *
352 */
353static void p9_tag_cleanup(struct p9_client *c)
354{
355 int row, col;
356
357 /* check to insure all requests are idle */
358 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
359 for (col = 0; col < P9_ROW_MAXTAG; col++) {
360 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
5d385153
JP		 361 p9_debug(P9_DEBUG_MUX,
362 "Attempting to cleanup non-free tag %d,%d\n",
363 row, col);
fea511a6
EVH		 364 /* TODO: delay execution of cleanup */
365 return;
366 }
367 }
368 }
369
62b2be59
LI		 370 if (c->tagpool) {
371 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
fea511a6 372 p9_idpool_destroy(c->tagpool);
62b2be59 373 }
fea511a6
EVH		 374
375 /* free requests associated with tags */
376 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
51a87c55 377 for (col = 0; col < P9_ROW_MAXTAG; col++) {
fea511a6 378 kfree(c->reqs[row][col].wq);
51a87c55
EVH		 379 kfree(c->reqs[row][col].tc);
380 kfree(c->reqs[row][col].rc);
381 }
fea511a6
EVH		 382 kfree(c->reqs[row]);
383 }
384 c->max_tag = 0;
385}
386
673d62cd
EVH		 387/**
388 * p9_free_req - free a request and clean-up as necessary
389 * c: client state
390 * r: request to release
391 *
392 */
393
51a87c55 394static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
673d62cd 395{
51a87c55 396 int tag = r->tc->tag;
5d385153 397 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
51a87c55 398
673d62cd 399 r->status = REQ_STATUS_IDLE;
51a87c55
EVH		 400 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
401 p9_idpool_put(tag, c->tagpool);
673d62cd
EVH		 402}
403
91b8534f
EVH		 404/**
405 * p9_client_cb - call back from transport to client
406 * c: client state
407 * req: request received
408 *
409 */
410void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
411{
5d385153 412 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
1bab88b2 413 wake_up(req->wq);
5d385153 414 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
91b8534f
EVH		 415}
416EXPORT_SYMBOL(p9_client_cb);
417
51a87c55
EVH		 418/**
419 * p9_parse_header - parse header arguments out of a packet
420 * @pdu: packet to parse
421 * @size: size of packet
422 * @type: type of request
423 * @tag: tag of packet
424 * @rewind: set if we need to rewind offset afterwards
425 */
426
427int
428p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
429 int rewind)
430{
431 int8_t r_type;
432 int16_t r_tag;
433 int32_t r_size;
434 int offset = pdu->offset;
435 int err;
436
437 pdu->offset = 0;
438 if (pdu->size == 0)
439 pdu->size = 7;
440
441 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
442 if (err)
443 goto rewind_and_exit;
444
445 pdu->size = r_size;
446 pdu->id = r_type;
447 pdu->tag = r_tag;
448
5d385153
JP		 449 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
450 pdu->size, pdu->id, pdu->tag);
51a87c55
EVH		 451
452 if (type)
453 *type = r_type;
454 if (tag)
455 *tag = r_tag;
456 if (size)
457 *size = r_size;
458
459
460rewind_and_exit:
461 if (rewind)
462 pdu->offset = offset;
463 return err;
464}
465EXPORT_SYMBOL(p9_parse_header);
466
467/**
468 * p9_check_errors - check 9p packet for error return and process it
469 * @c: current client instance
470 * @req: request to parse and check for error conditions
471 *
472 * returns error code if one is discovered, otherwise returns 0
473 *
474 * this will have to be more complicated if we have multiple
475 * error packet types
476 */
477
478static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
479{
480 int8_t type;
481 int err;
ca41bb3e 482 int ecode;
51a87c55
EVH		 483
484 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
348b5901
AK		 485 /*
486 * dump the response from server
487 * This should be after check errors which poplulate pdu_fcall.
488 */
489 trace_9p_protocol_dump(c, req->rc);
51a87c55 490 if (err) {
5d385153 491 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
51a87c55
EVH		 492 return err;
493 }
ca41bb3e
VJJ		 494 if (type != P9_RERROR && type != P9_RLERROR)
495 return 0;
4f7ebe80 496
ca41bb3e
VJJ		 497 if (!p9_is_proto_dotl(c)) {
498 char *ename;
ca41bb3e 499 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
abfa034e 500 &ename, &ecode);
ca41bb3e
VJJ		 501 if (err)
502 goto out_err;
4f7ebe80 503
ca41bb3e
VJJ		 504 if (p9_is_proto_dotu(c))
505 err = -ecode;
4f7ebe80 506
ca41bb3e
VJJ		 507 if (!err || !IS_ERR_VALUE(err)) {
508 err = p9_errstr2errno(ename, strlen(ename));
4f7ebe80 509
5d385153
JP		 510 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
511 -ecode, ename);
4f7ebe80 512 }
abfa034e 513 kfree(ename);
ca41bb3e
VJJ		 514 } else {
515 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
516 err = -ecode;
517
5d385153 518 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
ca41bb3e 519 }
51a87c55 520
51a87c55 521 return err;
4f7ebe80
AB		 522
523out_err:
5d385153 524 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
4f7ebe80
AB		 525
526 return err;
51a87c55
EVH		 527}
528
abfa034e
AK		 529/**
530 * p9_check_zc_errors - check 9p packet for error return and process it
531 * @c: current client instance
532 * @req: request to parse and check for error conditions
533 * @in_hdrlen: Size of response protocol buffer.
534 *
535 * returns error code if one is discovered, otherwise returns 0
536 *
537 * this will have to be more complicated if we have multiple
538 * error packet types
539 */
540
541static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
542 char *uidata, int in_hdrlen, int kern_buf)
543{
544 int err;
545 int ecode;
546 int8_t type;
547 char *ename = NULL;
548
549 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
348b5901
AK		 550 /*
551 * dump the response from server
552 * This should be after parse_header which poplulate pdu_fcall.
553 */
554 trace_9p_protocol_dump(c, req->rc);
abfa034e 555 if (err) {
5d385153 556 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
abfa034e
AK		 557 return err;
558 }
559
560 if (type != P9_RERROR && type != P9_RLERROR)
561 return 0;
562
563 if (!p9_is_proto_dotl(c)) {
564 /* Error is reported in string format */
565 uint16_t len;
566 /* 7 = header size for RERROR, 2 is the size of string len; */
567 int inline_len = in_hdrlen - (7 + 2);
568
569 /* Read the size of error string */
570 err = p9pdu_readf(req->rc, c->proto_version, "w", &len);
571 if (err)
572 goto out_err;
573
574 ename = kmalloc(len + 1, GFP_NOFS);
575 if (!ename) {
576 err = -ENOMEM;
577 goto out_err;
578 }
579 if (len <= inline_len) {
580 /* We have error in protocol buffer itself */
581 if (pdu_read(req->rc, ename, len)) {
582 err = -EFAULT;
583 goto out_free;
584
585 }
586 } else {
587 /*
588 * Part of the data is in user space buffer.
589 */
590 if (pdu_read(req->rc, ename, inline_len)) {
591 err = -EFAULT;
592 goto out_free;
593
594 }
595 if (kern_buf) {
596 memcpy(ename + inline_len, uidata,
597 len - inline_len);
598 } else {
599 err = copy_from_user(ename + inline_len,
600 uidata, len - inline_len);
601 if (err) {
602 err = -EFAULT;
603 goto out_free;
604 }
605 }
606 }
607 ename[len] = 0;
608 if (p9_is_proto_dotu(c)) {
609 /* For dotu we also have error code */
610 err = p9pdu_readf(req->rc,
611 c->proto_version, "d", &ecode);
612 if (err)
613 goto out_free;
614 err = -ecode;
615 }
616 if (!err || !IS_ERR_VALUE(err)) {
617 err = p9_errstr2errno(ename, strlen(ename));
618
5d385153
JP		 619 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
620 -ecode, ename);
abfa034e
AK		 621 }
622 kfree(ename);
623 } else {
624 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
625 err = -ecode;
626
5d385153 627 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
abfa034e
AK		 628 }
629 return err;
630
631out_free:
632 kfree(ename);
633out_err:
5d385153 634 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
abfa034e
AK		 635 return err;
636}
637
aca00763
RL		 638static struct p9_req_t *
639p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
640
51a87c55
EVH		 641/**
642 * p9_client_flush - flush (cancel) a request
0e15597e
AK		 643 * @c: client state
644 * @oldreq: request to cancel
51a87c55 645 *
aca00763 646 * This sents a flush for a particular request and links
51a87c55
EVH		 647 * the flush request to the original request. The current
648 * code only supports a single flush request although the protocol
649 * allows for multiple flush requests to be sent for a single request.
650 *
651 */
652
653static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
654{
655 struct p9_req_t *req;
656 int16_t oldtag;
657 int err;
658
659 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
660 if (err)
661 return err;
662
5d385153 663 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
51a87c55
EVH		 664
665 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
666 if (IS_ERR(req))
667 return PTR_ERR(req);
668
51a87c55 669
1bab88b2
LI		 670 /* if we haven't received a response for oldreq,
671 remove it from the list. */
672 spin_lock(&c->lock);
673 if (oldreq->status == REQ_STATUS_FLSH)
674 list_del(&oldreq->req_list);
675 spin_unlock(&c->lock);
676
677 p9_free_req(c, req);
51a87c55
EVH		 678 return 0;
679}
680
abfa034e
AK		 681static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
682 int8_t type, int req_size,
683 const char *fmt, va_list ap)
91b8534f 684{
51a87c55 685 int tag, err;
91b8534f 686 struct p9_req_t *req;
91b8534f 687
5d385153 688 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
91b8534f 689
6d96d3ab
AK		 690 /* we allow for any status other than disconnected */
691 if (c->status == Disconnected)
692 return ERR_PTR(-EIO);
693
694 /* if status is begin_disconnected we allow only clunk request */
695 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
51a87c55 696 return ERR_PTR(-EIO);
91b8534f 697
91b8534f 698 tag = P9_NOTAG;
51a87c55 699 if (type != P9_TVERSION) {
91b8534f
EVH		 700 tag = p9_idpool_get(c->tagpool);
701 if (tag < 0)
51a87c55 702 return ERR_PTR(-ENOMEM);
91b8534f
EVH		 703 }
704
abfa034e 705 req = p9_tag_alloc(c, tag, req_size);
51a87c55
EVH		 706 if (IS_ERR(req))
707 return req;
91b8534f 708
51a87c55
EVH		 709 /* marshall the data */
710 p9pdu_prepare(req->tc, tag, type);
342fee1d 711 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
7b3bb3fe
AK		 712 if (err)
713 goto reterr;
348b5901
AK		 714 p9pdu_finalize(c, req->tc);
715 trace_9p_client_req(c, type, tag);
abfa034e
AK		 716 return req;
717reterr:
718 p9_free_req(c, req);
719 return ERR_PTR(err);
720}
721
722/**
723 * p9_client_rpc - issue a request and wait for a response
724 * @c: client session
725 * @type: type of request
726 * @fmt: protocol format string (see protocol.c)
727 *
728 * Returns request structure (which client must free using p9_free_req)
729 */
730
731static struct p9_req_t *
732p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
733{
734 va_list ap;
735 int sigpending, err;
736 unsigned long flags;
737 struct p9_req_t *req;
738
739 va_start(ap, fmt);
740 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
741 va_end(ap);
742 if (IS_ERR(req))
743 return req;
744
745 if (signal_pending(current)) {
746 sigpending = 1;
747 clear_thread_flag(TIF_SIGPENDING);
748 } else
749 sigpending = 0;
91b8534f
EVH		 750
751 err = c->trans_mod->request(c, req);
752 if (err < 0) {
3cd79678 753 if (err != -ERESTARTSYS && err != -EFAULT)
52f44e0d 754 c->status = Disconnected;
91b8534f
EVH		 755 goto reterr;
756 }
a314f274 757again:
abfa034e 758 /* Wait for the response */
91b8534f 759 err = wait_event_interruptible(*req->wq,
abfa034e 760 req->status >= REQ_STATUS_RCVD);
91b8534f 761
a314f274
JG		 762 if ((err == -ERESTARTSYS) && (c->status == Connected)
763 && (type == P9_TFLUSH)) {
764 sigpending = 1;
765 clear_thread_flag(TIF_SIGPENDING);
766 goto again;
767 }
768
91b8534f 769 if (req->status == REQ_STATUS_ERROR) {
5d385153 770 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
91b8534f 771 err = req->t_err;
91b8534f 772 }
1bab88b2 773 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
5d385153 774 p9_debug(P9_DEBUG_MUX, "flushing\n");
91b8534f 775 sigpending = 1;
91b8534f
EVH		 776 clear_thread_flag(TIF_SIGPENDING);
777
1bab88b2
LI		 778 if (c->trans_mod->cancel(c, req))
779 p9_client_flush(c, req);
780
781 /* if we received the response anyway, don't signal error */
782 if (req->status == REQ_STATUS_RCVD)
783 err = 0;
91b8534f 784 }
91b8534f
EVH		 785 if (sigpending) {
786 spin_lock_irqsave(&current->sighand->siglock, flags);
787 recalc_sigpending();
788 spin_unlock_irqrestore(&current->sighand->siglock, flags);
789 }
91b8534f
EVH		 790 if (err < 0)
791 goto reterr;
792
51a87c55 793 err = p9_check_errors(c, req);
348b5901
AK		 794 trace_9p_client_res(c, type, req->rc->tag, err);
795 if (!err)
51a87c55 796 return req;
abfa034e 797reterr:
abfa034e 798 p9_free_req(c, req);
43def35c 799 return ERR_PTR(safe_errno(err));
abfa034e
AK		 800}
801
802/**
803 * p9_client_zc_rpc - issue a request and wait for a response
804 * @c: client session
805 * @type: type of request
806 * @uidata: user bffer that should be ued for zero copy read
807 * @uodata: user buffer that shoud be user for zero copy write
808 * @inlen: read buffer size
809 * @olen: write buffer size
810 * @hdrlen: reader header size, This is the size of response protocol data
811 * @fmt: protocol format string (see protocol.c)
812 *
813 * Returns request structure (which client must free using p9_free_req)
814 */
815static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
816 char *uidata, char *uodata,
817 int inlen, int olen, int in_hdrlen,
818 int kern_buf, const char *fmt, ...)
819{
820 va_list ap;
821 int sigpending, err;
822 unsigned long flags;
823 struct p9_req_t *req;
824
825 va_start(ap, fmt);
826 /*
827 * We allocate a inline protocol data of only 4k bytes.
828 * The actual content is passed in zero-copy fashion.
829 */
830 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
831 va_end(ap);
832 if (IS_ERR(req))
833 return req;
834
835 if (signal_pending(current)) {
836 sigpending = 1;
837 clear_thread_flag(TIF_SIGPENDING);
838 } else
839 sigpending = 0;
840
841 /* If we are called with KERNEL_DS force kern_buf */
842 if (segment_eq(get_fs(), KERNEL_DS))
843 kern_buf = 1;
844
845 err = c->trans_mod->zc_request(c, req, uidata, uodata,
846 inlen, olen, in_hdrlen, kern_buf);
847 if (err < 0) {
848 if (err == -EIO)
849 c->status = Disconnected;
850 goto reterr;
851 }
852 if (req->status == REQ_STATUS_ERROR) {
5d385153 853 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
abfa034e
AK		 854 err = req->t_err;
855 }
856 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
5d385153 857 p9_debug(P9_DEBUG_MUX, "flushing\n");
abfa034e
AK		 858 sigpending = 1;
859 clear_thread_flag(TIF_SIGPENDING);
91b8534f 860
abfa034e
AK		 861 if (c->trans_mod->cancel(c, req))
862 p9_client_flush(c, req);
863
864 /* if we received the response anyway, don't signal error */
865 if (req->status == REQ_STATUS_RCVD)
866 err = 0;
867 }
868 if (sigpending) {
869 spin_lock_irqsave(&current->sighand->siglock, flags);
870 recalc_sigpending();
871 spin_unlock_irqrestore(&current->sighand->siglock, flags);
872 }
873 if (err < 0)
874 goto reterr;
875
876 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
348b5901
AK		 877 trace_9p_client_res(c, type, req->rc->tag, err);
878 if (!err)
abfa034e 879 return req;
91b8534f
EVH		 880reterr:
881 p9_free_req(c, req);
43def35c 882 return ERR_PTR(safe_errno(err));
91b8534f
EVH		 883}
884
5503ac56
EVH		 885static struct p9_fid *p9_fid_create(struct p9_client *clnt)
886{
9f3e9bbe 887 int ret;
5503ac56 888 struct p9_fid *fid;
cac23d65 889 unsigned long flags;
5503ac56 890
5d385153 891 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
5503ac56
EVH		 892 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
893 if (!fid)
894 return ERR_PTR(-ENOMEM);
895
9f3e9bbe 896 ret = p9_idpool_get(clnt->fidpool);
24e94de4 897 if (ret < 0) {
9f3e9bbe 898 ret = -ENOSPC;
5503ac56
EVH		 899 goto error;
900 }
9f3e9bbe 901 fid->fid = ret;
5503ac56
EVH		 902
903 memset(&fid->qid, 0, sizeof(struct p9_qid));
904 fid->mode = -1;
f8b9d53a 905 fid->uid = current_fsuid();
5503ac56 906 fid->clnt = clnt;
3e2796a9 907 fid->rdir = NULL;
cac23d65 908 spin_lock_irqsave(&clnt->lock, flags);
5503ac56 909 list_add(&fid->flist, &clnt->fidlist);
cac23d65 910 spin_unlock_irqrestore(&clnt->lock, flags);
5503ac56
EVH		 911
912 return fid;
913
914error:
915 kfree(fid);
9f3e9bbe 916 return ERR_PTR(ret);
5503ac56
EVH		 917}
918
919static void p9_fid_destroy(struct p9_fid *fid)
920{
921 struct p9_client *clnt;
cac23d65 922 unsigned long flags;
5503ac56 923
5d385153 924 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
5503ac56
EVH		 925 clnt = fid->clnt;
926 p9_idpool_put(fid->fid, clnt->fidpool);
cac23d65 927 spin_lock_irqsave(&clnt->lock, flags);
5503ac56 928 list_del(&fid->flist);
cac23d65 929 spin_unlock_irqrestore(&clnt->lock, flags);
3e2796a9 930 kfree(fid->rdir);
5503ac56
EVH		 931 kfree(fid);
932}
8a0dc95f 933
32a875ad 934static int p9_client_version(struct p9_client *c)
bd238fb4 935{
6936bf60 936 int err = 0;
51a87c55
EVH		 937 struct p9_req_t *req;
938 char *version;
939 int msize;
bd238fb4 940
5d385153
JP		 941 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
942 c->msize, c->proto_version);
c5a7697d
SK		 943
944 switch (c->proto_version) {
45bc21ed 945 case p9_proto_2000L:
c5a7697d 946 req = p9_client_rpc(c, P9_TVERSION, "ds",
45bc21ed 947 c->msize, "9P2000.L");
c5a7697d
SK		 948 break;
949 case p9_proto_2000u:
950 req = p9_client_rpc(c, P9_TVERSION, "ds",
951 c->msize, "9P2000.u");
952 break;
953 case p9_proto_legacy:
954 req = p9_client_rpc(c, P9_TVERSION, "ds",
955 c->msize, "9P2000");
956 break;
957 default:
958 return -EINVAL;
959 break;
960 }
961
51a87c55
EVH		 962 if (IS_ERR(req))
963 return PTR_ERR(req);
6936bf60 964
342fee1d 965 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
51a87c55 966 if (err) {
5d385153 967 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
348b5901 968 trace_9p_protocol_dump(c, req->rc);
6936bf60 969 goto error;
51a87c55 970 }
6936bf60 971
5d385153 972 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
45bc21ed
SK		 973 if (!strncmp(version, "9P2000.L", 8))
974 c->proto_version = p9_proto_2000L;
c5a7697d 975 else if (!strncmp(version, "9P2000.u", 8))
342fee1d
SK		 976 c->proto_version = p9_proto_2000u;
977 else if (!strncmp(version, "9P2000", 6))
978 c->proto_version = p9_proto_legacy;
6936bf60
EVH		 979 else {
980 err = -EREMOTEIO;
981 goto error;
982 }
983
51a87c55
EVH		 984 if (msize < c->msize)
985 c->msize = msize;
6936bf60
EVH		 986
987error:
51a87c55
EVH		 988 kfree(version);
989 p9_free_req(c, req);
6936bf60
EVH		 990
991 return err;
992}
6936bf60
EVH		 993
994struct p9_client *p9_client_create(const char *dev_name, char *options)
995{
996 int err;
997 struct p9_client *clnt;
998
999 err = 0;
bd238fb4
LI		 1000 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1001 if (!clnt)
1002 return ERR_PTR(-ENOMEM);
1003
72029fe8 1004 clnt->trans_mod = NULL;
bb8ffdfc 1005 clnt->trans = NULL;
bd238fb4 1006 spin_lock_init(&clnt->lock);
bd238fb4 1007 INIT_LIST_HEAD(&clnt->fidlist);
bd238fb4 1008
fe1cbaba
AK		 1009 err = p9_tag_init(clnt);
1010 if (err < 0)
1011 goto free_client;
fea511a6 1012
bb8ffdfc
EVH		 1013 err = parse_opts(options, clnt);
1014 if (err < 0)
fe1cbaba 1015 goto destroy_tagpool;
bb8ffdfc 1016
a17d1720
AK		 1017 if (!clnt->trans_mod)
1018 clnt->trans_mod = v9fs_get_default_trans();
1019
8a0dc95f
EVH		 1020 if (clnt->trans_mod == NULL) {
1021 err = -EPROTONOSUPPORT;
5d385153
JP		 1022 p9_debug(P9_DEBUG_ERROR,
1023 "No transport defined or default transport\n");
fe1cbaba 1024 goto destroy_tagpool;
8781ff94
EVH		 1025 }
1026
1027 clnt->fidpool = p9_idpool_create();
1028 if (IS_ERR(clnt->fidpool)) {
1029 err = PTR_ERR(clnt->fidpool);
8781ff94 1030 goto put_trans;
8a0dc95f
EVH		 1031 }
1032
5d385153
JP		 1033 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1034 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
8a0dc95f 1035
8b81ef58
EVH		 1036 err = clnt->trans_mod->create(clnt, dev_name, options);
1037 if (err)
8781ff94 1038 goto destroy_fidpool;
bd238fb4 1039
c9ffb05c
VJJ		 1040 if (clnt->msize > clnt->trans_mod->maxsize)
1041 clnt->msize = clnt->trans_mod->maxsize;
8a0dc95f 1042
6936bf60 1043 err = p9_client_version(clnt);
bd238fb4 1044 if (err)
8781ff94 1045 goto close_trans;
bd238fb4 1046
bd238fb4
LI		 1047 return clnt;
1048
8781ff94
EVH		 1049close_trans:
1050 clnt->trans_mod->close(clnt);
1051destroy_fidpool:
1052 p9_idpool_destroy(clnt->fidpool);
1053put_trans:
1054 v9fs_put_trans(clnt->trans_mod);
fe1cbaba
AK		 1055destroy_tagpool:
1056 p9_idpool_destroy(clnt->tagpool);
8781ff94
EVH		 1057free_client:
1058 kfree(clnt);
bd238fb4
LI		 1059 return ERR_PTR(err);
1060}
1061EXPORT_SYMBOL(p9_client_create);
1062
1063void p9_client_destroy(struct p9_client *clnt)
1064{
1065 struct p9_fid *fid, *fidptr;
1066
5d385153 1067 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
bd238fb4 1068
8b81ef58
EVH		 1069 if (clnt->trans_mod)
1070 clnt->trans_mod->close(clnt);
bd238fb4 1071
72029fe8
TH		 1072 v9fs_put_trans(clnt->trans_mod);
1073
6d96d3ab 1074 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
5d385153 1075 pr_info("Found fid %d not clunked\n", fid->fid);
bd238fb4 1076 p9_fid_destroy(fid);
6d96d3ab 1077 }
bd238fb4 1078
0af8887e
EVH		 1079 if (clnt->fidpool)
1080 p9_idpool_destroy(clnt->fidpool);
1081
fea511a6
EVH		 1082 p9_tag_cleanup(clnt);
1083
bd238fb4
LI		 1084 kfree(clnt);
1085}
1086EXPORT_SYMBOL(p9_client_destroy);
1087
1088void p9_client_disconnect(struct p9_client *clnt)
1089{
5d385153 1090 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
8b81ef58 1091 clnt->status = Disconnected;
bd238fb4
LI		 1092}
1093EXPORT_SYMBOL(p9_client_disconnect);
1094
6d96d3ab
AK		 1095void p9_client_begin_disconnect(struct p9_client *clnt)
1096{
5d385153 1097 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
6d96d3ab
AK		 1098 clnt->status = BeginDisconnect;
1099}
1100EXPORT_SYMBOL(p9_client_begin_disconnect);
1101
bd238fb4 1102struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
ba17674f 1103 char *uname, u32 n_uname, char *aname)
bd238fb4 1104{
348b5901 1105 int err = 0;
51a87c55 1106 struct p9_req_t *req;
bd238fb4 1107 struct p9_fid *fid;
51a87c55 1108 struct p9_qid qid;
bd238fb4 1109
bd238fb4 1110
5d385153
JP		 1111 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1112 afid ? afid->fid : -1, uname, aname);
bd238fb4
LI		 1113 fid = p9_fid_create(clnt);
1114 if (IS_ERR(fid)) {
1115 err = PTR_ERR(fid);
1116 fid = NULL;
1117 goto error;
1118 }
1119
51a87c55
EVH		 1120 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
1121 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1122 if (IS_ERR(req)) {
1123 err = PTR_ERR(req);
bd238fb4
LI		 1124 goto error;
1125 }
1126
342fee1d 1127 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
51a87c55 1128 if (err) {
348b5901 1129 trace_9p_protocol_dump(clnt, req->rc);
51a87c55 1130 p9_free_req(clnt, req);
bd238fb4 1131 goto error;
51a87c55 1132 }
bd238fb4 1133
5d385153
JP		 1134 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1135 qid.type, (unsigned long long)qid.path, qid.version);
51a87c55
EVH		 1136
1137 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1138
1139 p9_free_req(clnt, req);
bd238fb4
LI		 1140 return fid;
1141
1142error:
bd238fb4
LI		 1143 if (fid)
1144 p9_fid_destroy(fid);
1145 return ERR_PTR(err);
1146}
1147EXPORT_SYMBOL(p9_client_attach);
1148
b76225e2
HPB		 1149struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1150 char **wnames, int clone)
bd238fb4
LI		 1151{
1152 int err;
bd238fb4
LI		 1153 struct p9_client *clnt;
1154 struct p9_fid *fid;
51a87c55
EVH		 1155 struct p9_qid *wqids;
1156 struct p9_req_t *req;
b76225e2 1157 uint16_t nwqids, count;
bd238fb4 1158
bd238fb4 1159 err = 0;
62b2be59 1160 wqids = NULL;
bd238fb4
LI		 1161 clnt = oldfid->clnt;
1162 if (clone) {
1163 fid = p9_fid_create(clnt);
1164 if (IS_ERR(fid)) {
1165 err = PTR_ERR(fid);
1166 fid = NULL;
1167 goto error;
1168 }
1169
1170 fid->uid = oldfid->uid;
1171 } else
1172 fid = oldfid;
1173
51a87c55 1174
5d385153
JP		 1175 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1176 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
51a87c55
EVH		 1177
1178 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1179 nwname, wnames);
1180 if (IS_ERR(req)) {
1181 err = PTR_ERR(req);
bd238fb4
LI		 1182 goto error;
1183 }
1184
342fee1d 1185 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
e7f4b8f1 1186 if (err) {
348b5901 1187 trace_9p_protocol_dump(clnt, req->rc);
e7f4b8f1 1188 p9_free_req(clnt, req);
51a87c55 1189 goto clunk_fid;
e7f4b8f1
EVH		 1190 }
1191 p9_free_req(clnt, req);
bd238fb4 1192
5d385153 1193 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
51a87c55
EVH		 1194
1195 if (nwqids != nwname) {
bd238fb4
LI		 1196 err = -ENOENT;
1197 goto clunk_fid;
1198 }
1199
51a87c55 1200 for (count = 0; count < nwqids; count++)
5d385153 1201 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
b0d5fdef
RD		 1202 count, wqids[count].type,
1203 (unsigned long long)wqids[count].path,
51a87c55
EVH		 1204 wqids[count].version);
1205
bd238fb4 1206 if (nwname)
51a87c55 1207 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
bd238fb4
LI		 1208 else
1209 fid->qid = oldfid->qid;
1210
62b2be59 1211 kfree(wqids);
bd238fb4
LI		 1212 return fid;
1213
1214clunk_fid:
62b2be59 1215 kfree(wqids);
51a87c55
EVH		 1216 p9_client_clunk(fid);
1217 fid = NULL;
bd238fb4
LI		 1218
1219error:
bd238fb4
LI		 1220 if (fid && (fid != oldfid))
1221 p9_fid_destroy(fid);
1222
1223 return ERR_PTR(err);
1224}
1225EXPORT_SYMBOL(p9_client_walk);
1226
1227int p9_client_open(struct p9_fid *fid, int mode)
1228{
1229 int err;
bd238fb4 1230 struct p9_client *clnt;
51a87c55
EVH		 1231 struct p9_req_t *req;
1232 struct p9_qid qid;
1233 int iounit;
bd238fb4 1234
bd238fb4 1235 clnt = fid->clnt;
5d385153 1236 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
ef56547e
MK		 1237 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1238 err = 0;
bd238fb4
LI		 1239
1240 if (fid->mode != -1)
1241 return -EINVAL;
1242
ef56547e
MK		 1243 if (p9_is_proto_dotl(clnt))
1244 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1245 else
1246 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
51a87c55
EVH		 1247 if (IS_ERR(req)) {
1248 err = PTR_ERR(req);
1249 goto error;
bd238fb4
LI		 1250 }
1251
342fee1d 1252 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
e7f4b8f1 1253 if (err) {
348b5901 1254 trace_9p_protocol_dump(clnt, req->rc);
e7f4b8f1
EVH		 1255 goto free_and_error;
1256 }
51a87c55 1257
5d385153 1258 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
ef56547e
MK		 1259 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1260 (unsigned long long)qid.path, qid.version, iounit);
bd238fb4
LI		 1261
1262 fid->mode = mode;
51a87c55 1263 fid->iounit = iounit;
bd238fb4 1264
e7f4b8f1
EVH		 1265free_and_error:
1266 p9_free_req(clnt, req);
51a87c55 1267error:
bd238fb4
LI		 1268 return err;
1269}
1270EXPORT_SYMBOL(p9_client_open);
1271
5643135a
VJJ		 1272int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1273 gid_t gid, struct p9_qid *qid)
1274{
1275 int err = 0;
1276 struct p9_client *clnt;
1277 struct p9_req_t *req;
1278 int iounit;
1279
5d385153 1280 p9_debug(P9_DEBUG_9P,
5643135a
VJJ		 1281 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1282 ofid->fid, name, flags, mode, gid);
1283 clnt = ofid->clnt;
1284
1285 if (ofid->mode != -1)
1286 return -EINVAL;
1287
1288 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1289 mode, gid);
1290 if (IS_ERR(req)) {
1291 err = PTR_ERR(req);
1292 goto error;
1293 }
1294
1295 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1296 if (err) {
348b5901 1297 trace_9p_protocol_dump(clnt, req->rc);
5643135a
VJJ		 1298 goto free_and_error;
1299 }
1300
5d385153 1301 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
5643135a
VJJ		 1302 qid->type,
1303 (unsigned long long)qid->path,
1304 qid->version, iounit);
1305
1306 ofid->mode = mode;
1307 ofid->iounit = iounit;
1308
1309free_and_error:
1310 p9_free_req(clnt, req);
1311error:
1312 return err;
1313}
1314EXPORT_SYMBOL(p9_client_create_dotl);
1315
bd238fb4
LI		 1316int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1317 char *extension)
1318{
1319 int err;
bd238fb4 1320 struct p9_client *clnt;
51a87c55
EVH		 1321 struct p9_req_t *req;
1322 struct p9_qid qid;
1323 int iounit;
bd238fb4 1324
5d385153 1325 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
51a87c55 1326 fid->fid, name, perm, mode);
bd238fb4 1327 err = 0;
bd238fb4
LI		 1328 clnt = fid->clnt;
1329
1330 if (fid->mode != -1)
1331 return -EINVAL;
1332
51a87c55
EVH		 1333 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1334 mode, extension);
1335 if (IS_ERR(req)) {
1336 err = PTR_ERR(req);
1337 goto error;
bd238fb4
LI		 1338 }
1339
342fee1d 1340 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
e7f4b8f1 1341 if (err) {
348b5901 1342 trace_9p_protocol_dump(clnt, req->rc);
e7f4b8f1
EVH		 1343 goto free_and_error;
1344 }
51a87c55 1345
5d385153 1346 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
b0d5fdef
RD		 1347 qid.type,
1348 (unsigned long long)qid.path,
1349 qid.version, iounit);
bd238fb4
LI		 1350
1351 fid->mode = mode;
51a87c55 1352 fid->iounit = iounit;
bd238fb4 1353
e7f4b8f1
EVH		 1354free_and_error:
1355 p9_free_req(clnt, req);
51a87c55 1356error:
bd238fb4
LI		 1357 return err;
1358}
1359EXPORT_SYMBOL(p9_client_fcreate);
1360
50cc42ff
VJJ		 1361int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1362 struct p9_qid *qid)
1363{
1364 int err = 0;
1365 struct p9_client *clnt;
1366 struct p9_req_t *req;
1367
5d385153 1368 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
50cc42ff
VJJ		 1369 dfid->fid, name, symtgt);
1370 clnt = dfid->clnt;
1371
1372 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1373 gid);
1374 if (IS_ERR(req)) {
1375 err = PTR_ERR(req);
1376 goto error;
1377 }
1378
1379 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1380 if (err) {
348b5901 1381 trace_9p_protocol_dump(clnt, req->rc);
50cc42ff
VJJ		 1382 goto free_and_error;
1383 }
1384
5d385153 1385 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
50cc42ff
VJJ		 1386 qid->type, (unsigned long long)qid->path, qid->version);
1387
1388free_and_error:
1389 p9_free_req(clnt, req);
1390error:
1391 return err;
1392}
1393EXPORT_SYMBOL(p9_client_symlink);
1394
652df9a7
VJJ		 1395int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1396{
1397 struct p9_client *clnt;
1398 struct p9_req_t *req;
1399
5d385153 1400 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
652df9a7
VJJ		 1401 dfid->fid, oldfid->fid, newname);
1402 clnt = dfid->clnt;
1403 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1404 newname);
1405 if (IS_ERR(req))
1406 return PTR_ERR(req);
1407
5d385153 1408 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
652df9a7
VJJ		 1409 p9_free_req(clnt, req);
1410 return 0;
1411}
1412EXPORT_SYMBOL(p9_client_link);
1413
b165d601 1414int p9_client_fsync(struct p9_fid *fid, int datasync)
920e65dc
VJJ		 1415{
1416 int err;
1417 struct p9_client *clnt;
1418 struct p9_req_t *req;
1419
5d385153 1420 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
b165d601 1421 fid->fid, datasync);
920e65dc
VJJ		 1422 err = 0;
1423 clnt = fid->clnt;
1424
b165d601 1425 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
920e65dc
VJJ		 1426 if (IS_ERR(req)) {
1427 err = PTR_ERR(req);
1428 goto error;
1429 }
1430
5d385153 1431 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
920e65dc
VJJ		 1432
1433 p9_free_req(clnt, req);
1434
1435error:
1436 return err;
1437}
1438EXPORT_SYMBOL(p9_client_fsync);
1439
bd238fb4
LI		 1440int p9_client_clunk(struct p9_fid *fid)
1441{
1442 int err;
bd238fb4 1443 struct p9_client *clnt;
51a87c55 1444 struct p9_req_t *req;
208f3c28 1445 int retries = 0;
bd238fb4 1446
8e44a080 1447 if (!fid) {
5d385153
JP		 1448 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1449 __func__, task_pid_nr(current));
8e44a080 1450 dump_stack();
1451 return 0;
1452 }
1453
208f3c28
JG		 1454again:
1455 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1456 retries);
bd238fb4 1457 err = 0;
bd238fb4
LI		 1458 clnt = fid->clnt;
1459
51a87c55
EVH		 1460 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1461 if (IS_ERR(req)) {
1462 err = PTR_ERR(req);
1463 goto error;
bd238fb4
LI		 1464 }
1465
5d385153 1466 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
bd238fb4 1467
51a87c55 1468 p9_free_req(clnt, req);
51a87c55 1469error:
5034990e
AK		 1470 /*
1471 * Fid is not valid even after a failed clunk
208f3c28
JG		 1472 * If interrupted, retry once then give up and
1473 * leak fid until umount.
5034990e 1474 */
208f3c28
JG		 1475 if (err == -ERESTARTSYS) {
1476 if (retries++ == 0)
1477 goto again;
1478 } else
1479 p9_fid_destroy(fid);
bd238fb4
LI		 1480 return err;
1481}
1482EXPORT_SYMBOL(p9_client_clunk);
1483
1484int p9_client_remove(struct p9_fid *fid)
1485{
1486 int err;
bd238fb4 1487 struct p9_client *clnt;
51a87c55 1488 struct p9_req_t *req;
bd238fb4 1489
5d385153 1490 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
bd238fb4 1491 err = 0;
bd238fb4
LI		 1492 clnt = fid->clnt;
1493
51a87c55
EVH		 1494 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1495 if (IS_ERR(req)) {
1496 err = PTR_ERR(req);
1497 goto error;
bd238fb4
LI		 1498 }
1499
5d385153 1500 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
bd238fb4 1501
51a87c55 1502 p9_free_req(clnt, req);
51a87c55 1503error:
208f3c28
JG		 1504 if (err == -ERESTARTSYS)
1505 p9_client_clunk(fid);
1506 else
1507 p9_fid_destroy(fid);
bd238fb4
LI		 1508 return err;
1509}
1510EXPORT_SYMBOL(p9_client_remove);
1511
48e370ff
AK		 1512int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1513{
1514 int err = 0;
1515 struct p9_req_t *req;
1516 struct p9_client *clnt;
1517
5d385153 1518 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
48e370ff
AK		 1519 dfid->fid, name, flags);
1520
1521 clnt = dfid->clnt;
1522 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1523 if (IS_ERR(req)) {
1524 err = PTR_ERR(req);
1525 goto error;
1526 }
5d385153 1527 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
48e370ff
AK		 1528
1529 p9_free_req(clnt, req);
1530error:
1531 return err;
1532}
1533EXPORT_SYMBOL(p9_client_unlinkat);
1534
0fc9655e
EVH		 1535int
1536p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1537 u32 count)
bd238fb4 1538{
51a87c55 1539 char *dataptr;
abfa034e
AK		 1540 int kernel_buf = 0;
1541 struct p9_req_t *req;
1542 struct p9_client *clnt;
1543 int err, rsize, non_zc = 0;
1544
bd238fb4 1545
5d385153 1546 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
95c96174 1547 fid->fid, (unsigned long long) offset, count);
bd238fb4 1548 err = 0;
bd238fb4 1549 clnt = fid->clnt;
bd238fb4
LI		 1550
1551 rsize = fid->iounit;
1552 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1553 rsize = clnt->msize - P9_IOHDRSZ;
1554
51a87c55
EVH		 1555 if (count < rsize)
1556 rsize = count;
bd238fb4 1557
aca00763 1558 /* Don't bother zerocopy for small IO (< 1024) */
abfa034e
AK		 1559 if (clnt->trans_mod->zc_request && rsize > 1024) {
1560 char *indata;
1561 if (data) {
1562 kernel_buf = 1;
1563 indata = data;
1564 } else
f07d9010 1565 indata = (__force char *)udata;
abfa034e
AK		 1566 /*
1567 * response header len is 11
1568 * PDU Header(7) + IO Size (4)
1569 */
1570 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1571 11, kernel_buf, "dqd", fid->fid,
1572 offset, rsize);
bb2f8a55 1573 } else {
abfa034e 1574 non_zc = 1;
bb2f8a55 1575 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
abfa034e 1576 rsize);
bb2f8a55 1577 }
51a87c55
EVH		 1578 if (IS_ERR(req)) {
1579 err = PTR_ERR(req);
1580 goto error;
1581 }
bd238fb4 1582
342fee1d 1583 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
e7f4b8f1 1584 if (err) {
348b5901 1585 trace_9p_protocol_dump(clnt, req->rc);
51a87c55 1586 goto free_and_error;
e7f4b8f1 1587 }
bd238fb4 1588
5d385153 1589 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
bd238fb4 1590
abfa034e 1591 if (non_zc) {
bb2f8a55
VJJ		 1592 if (data) {
1593 memmove(data, dataptr, count);
1594 } else {
1595 err = copy_to_user(udata, dataptr, count);
1596 if (err) {
1597 err = -EFAULT;
1598 goto free_and_error;
1599 }
bd238fb4 1600 }
51a87c55 1601 }
51a87c55
EVH		 1602 p9_free_req(clnt, req);
1603 return count;
bd238fb4 1604
51a87c55
EVH		 1605free_and_error:
1606 p9_free_req(clnt, req);
bd238fb4 1607error:
bd238fb4
LI		 1608 return err;
1609}
0fc9655e 1610EXPORT_SYMBOL(p9_client_read);
bd238fb4
LI		 1611
1612int
0fc9655e
EVH		 1613p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1614 u64 offset, u32 count)
bd238fb4 1615{
095d3da6 1616 int err, rsize;
abfa034e 1617 int kernel_buf = 0;
bd238fb4 1618 struct p9_client *clnt;
51a87c55 1619 struct p9_req_t *req;
bd238fb4 1620
5d385153 1621 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
95c96174 1622 fid->fid, (unsigned long long) offset, count);
bd238fb4 1623 err = 0;
bd238fb4 1624 clnt = fid->clnt;
bd238fb4
LI		 1625
1626 rsize = fid->iounit;
1627 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1628 rsize = clnt->msize - P9_IOHDRSZ;
1629
51a87c55
EVH		 1630 if (count < rsize)
1631 rsize = count;
1fc52481 1632
abfa034e
AK		 1633 /* Don't bother zerocopy for small IO (< 1024) */
1634 if (clnt->trans_mod->zc_request && rsize > 1024) {
1635 char *odata;
1636 if (data) {
1637 kernel_buf = 1;
1638 odata = data;
1639 } else
1640 odata = (char *)udata;
1641 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1642 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1643 fid->fid, offset, rsize);
1fc52481 1644 } else {
1fc52481
VJJ		 1645 if (data)
1646 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
abfa034e 1647 offset, rsize, data);
1fc52481
VJJ		 1648 else
1649 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
abfa034e 1650 offset, rsize, udata);
1fc52481 1651 }
51a87c55
EVH		 1652 if (IS_ERR(req)) {
1653 err = PTR_ERR(req);
1654 goto error;
1655 }
0fc9655e 1656
342fee1d 1657 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
e7f4b8f1 1658 if (err) {
348b5901 1659 trace_9p_protocol_dump(clnt, req->rc);
51a87c55 1660 goto free_and_error;
e7f4b8f1
EVH		 1661 }
1662
5d385153 1663 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
bd238fb4 1664
51a87c55
EVH		 1665 p9_free_req(clnt, req);
1666 return count;
bd238fb4 1667
51a87c55
EVH		 1668free_and_error:
1669 p9_free_req(clnt, req);
bd238fb4 1670error:
bd238fb4
LI		 1671 return err;
1672}
0fc9655e 1673EXPORT_SYMBOL(p9_client_write);
bd238fb4 1674
51a87c55 1675struct p9_wstat *p9_client_stat(struct p9_fid *fid)
5503ac56 1676{
51a87c55
EVH		 1677 int err;
1678 struct p9_client *clnt;
1679 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1680 struct p9_req_t *req;
1681 u16 ignored;
5503ac56 1682
5d385153 1683 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
5503ac56 1684
5503ac56
EVH		 1685 if (!ret)
1686 return ERR_PTR(-ENOMEM);
1687
bd238fb4 1688 err = 0;
bd238fb4
LI		 1689 clnt = fid->clnt;
1690
51a87c55
EVH		 1691 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1692 if (IS_ERR(req)) {
1693 err = PTR_ERR(req);
bd238fb4
LI		 1694 goto error;
1695 }
1696
342fee1d 1697 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
e7f4b8f1 1698 if (err) {
348b5901 1699 trace_9p_protocol_dump(clnt, req->rc);
eedfe1c4
AK		 1700 p9_free_req(clnt, req);
1701 goto error;
e7f4b8f1 1702 }
bd238fb4 1703
5d385153 1704 p9_debug(P9_DEBUG_9P,
e7f4b8f1
EVH		 1705 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1706 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1707 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1708 "<<< uid=%d gid=%d n_muid=%d\n",
51a87c55 1709 ret->size, ret->type, ret->dev, ret->qid.type,
b0d5fdef
RD		 1710 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1711 ret->atime, ret->mtime, (unsigned long long)ret->length,
1712 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
e7f4b8f1 1713 ret->n_uid, ret->n_gid, ret->n_muid);
bd238fb4 1714
742b11a7
LI		 1715 p9_free_req(clnt, req);
1716 return ret;
1717
bd238fb4 1718error:
742b11a7
LI		 1719 kfree(ret);
1720 return ERR_PTR(err);
bd238fb4
LI		 1721}
1722EXPORT_SYMBOL(p9_client_stat);
1723
f0853122
SK		 1724struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1725 u64 request_mask)
1726{
1727 int err;
1728 struct p9_client *clnt;
1729 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1730 GFP_KERNEL);
1731 struct p9_req_t *req;
1732
5d385153 1733 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
f0853122
SK		 1734 fid->fid, request_mask);
1735
1736 if (!ret)
1737 return ERR_PTR(-ENOMEM);
1738
1739 err = 0;
1740 clnt = fid->clnt;
1741
1742 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1743 if (IS_ERR(req)) {
1744 err = PTR_ERR(req);
1745 goto error;
1746 }
1747
1748 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1749 if (err) {
348b5901 1750 trace_9p_protocol_dump(clnt, req->rc);
f0853122
SK		 1751 p9_free_req(clnt, req);
1752 goto error;
1753 }
1754
5d385153 1755 p9_debug(P9_DEBUG_9P,
f0853122
SK		 1756 "<<< RGETATTR st_result_mask=%lld\n"
1757 "<<< qid=%x.%llx.%x\n"
1758 "<<< st_mode=%8.8x st_nlink=%llu\n"
1759 "<<< st_uid=%d st_gid=%d\n"
1760 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1761 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1762 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1763 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1764 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1765 "<<< st_gen=%lld st_data_version=%lld",
1766 ret->st_result_mask, ret->qid.type, ret->qid.path,
1767 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1768 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1769 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1770 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1771 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1772 ret->st_gen, ret->st_data_version);
1773
1774 p9_free_req(clnt, req);
1775 return ret;
1776
1777error:
1778 kfree(ret);
1779 return ERR_PTR(err);
1780}
1781EXPORT_SYMBOL(p9_client_getattr_dotl);
1782
342fee1d 1783static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
453ed90d
LI		 1784{
1785 int ret;
1786
9d6939da 1787 /* NOTE: size shouldn't include its own length */
453ed90d
LI		 1788 /* size[2] type[2] dev[4] qid[13] */
1789 /* mode[4] atime[4] mtime[4] length[8]*/
1790 /* name[s] uid[s] gid[s] muid[s] */
9d6939da 1791 ret = 2+4+13+4+4+4+8+2+2+2+2;
453ed90d
LI		 1792
1793 if (wst->name)
1794 ret += strlen(wst->name);
1795 if (wst->uid)
1796 ret += strlen(wst->uid);
1797 if (wst->gid)
1798 ret += strlen(wst->gid);
1799 if (wst->muid)
1800 ret += strlen(wst->muid);
1801
c56e4acf
SK		 1802 if ((proto_version == p9_proto_2000u) ||
1803 (proto_version == p9_proto_2000L)) {
453ed90d
LI		 1804 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1805 if (wst->extension)
1806 ret += strlen(wst->extension);
1807 }
1808
1809 return ret;
1810}
1811
bd238fb4
LI		 1812int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1813{
1814 int err;
51a87c55 1815 struct p9_req_t *req;
bd238fb4
LI		 1816 struct p9_client *clnt;
1817
453ed90d
LI		 1818 err = 0;
1819 clnt = fid->clnt;
342fee1d 1820 wst->size = p9_client_statsize(wst, clnt->proto_version);
5d385153
JP		 1821 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1822 p9_debug(P9_DEBUG_9P,
e7f4b8f1
EVH		 1823 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1824 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1825 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1826 " uid=%d gid=%d n_muid=%d\n",
1827 wst->size, wst->type, wst->dev, wst->qid.type,
b0d5fdef
RD		 1828 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1829 wst->atime, wst->mtime, (unsigned long long)wst->length,
1830 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
e7f4b8f1 1831 wst->n_uid, wst->n_gid, wst->n_muid);
bd238fb4 1832
9d6939da 1833 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
51a87c55
EVH		 1834 if (IS_ERR(req)) {
1835 err = PTR_ERR(req);
1836 goto error;
bd238fb4
LI		 1837 }
1838
5d385153 1839 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
bd238fb4 1840
51a87c55
EVH		 1841 p9_free_req(clnt, req);
1842error:
bd238fb4
LI		 1843 return err;
1844}
1845EXPORT_SYMBOL(p9_client_wstat);
bda8e775 1846
87d7845a
SK		 1847int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1848{
1849 int err;
1850 struct p9_req_t *req;
1851 struct p9_client *clnt;
1852
1853 err = 0;
1854 clnt = fid->clnt;
5d385153
JP		 1855 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1856 p9_debug(P9_DEBUG_9P,
87d7845a
SK		 1857 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1858 " atime_sec=%lld atime_nsec=%lld\n"
1859 " mtime_sec=%lld mtime_nsec=%lld\n",
1860 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1861 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1862 p9attr->mtime_sec, p9attr->mtime_nsec);
1863
1864 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1865
1866 if (IS_ERR(req)) {
1867 err = PTR_ERR(req);
1868 goto error;
1869 }
5d385153 1870 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
87d7845a
SK		 1871 p9_free_req(clnt, req);
1872error:
1873 return err;
1874}
1875EXPORT_SYMBOL(p9_client_setattr);
1876
bda8e775
SK		 1877int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1878{
1879 int err;
1880 struct p9_req_t *req;
1881 struct p9_client *clnt;
1882
1883 err = 0;
1884 clnt = fid->clnt;
1885
5d385153 1886 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
bda8e775
SK		 1887
1888 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1889 if (IS_ERR(req)) {
1890 err = PTR_ERR(req);
1891 goto error;
1892 }
1893
1894 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1895 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1896 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1897 if (err) {
348b5901 1898 trace_9p_protocol_dump(clnt, req->rc);
bda8e775
SK		 1899 p9_free_req(clnt, req);
1900 goto error;
1901 }
1902
5d385153 1903 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
bda8e775
SK		 1904 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1905 "fsid %llu namelen %ld\n",
1906 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1907 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1908 sb->fsid, (long int)sb->namelen);
1909
1910 p9_free_req(clnt, req);
1911error:
1912 return err;
1913}
1914EXPORT_SYMBOL(p9_client_statfs);
4681dbda 1915
9e8fb38e
AK		 1916int p9_client_rename(struct p9_fid *fid,
1917 struct p9_fid *newdirfid, const char *name)
4681dbda
SK		 1918{
1919 int err;
1920 struct p9_req_t *req;
1921 struct p9_client *clnt;
1922
1923 err = 0;
1924 clnt = fid->clnt;
1925
5d385153 1926 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
4681dbda
SK		 1927 fid->fid, newdirfid->fid, name);
1928
1929 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1930 newdirfid->fid, name);
1931 if (IS_ERR(req)) {
1932 err = PTR_ERR(req);
1933 goto error;
1934 }
1935
5d385153 1936 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
4681dbda
SK		 1937
1938 p9_free_req(clnt, req);
1939error:
1940 return err;
1941}
1942EXPORT_SYMBOL(p9_client_rename);
1943
9e8fb38e
AK		 1944int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1945 struct p9_fid *newdirfid, const char *new_name)
1946{
1947 int err;
1948 struct p9_req_t *req;
1949 struct p9_client *clnt;
1950
1951 err = 0;
1952 clnt = olddirfid->clnt;
1953
5d385153 1954 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
9e8fb38e
AK		 1955 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1956 newdirfid->fid, new_name);
1957
1958 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1959 old_name, newdirfid->fid, new_name);
1960 if (IS_ERR(req)) {
1961 err = PTR_ERR(req);
1962 goto error;
1963 }
1964
5d385153 1965 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
9e8fb38e
AK		 1966 newdirfid->fid, new_name);
1967
1968 p9_free_req(clnt, req);
1969error:
1970 return err;
1971}
1972EXPORT_SYMBOL(p9_client_renameat);
1973
0ef63f34
AK		 1974/*
1975 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1976 */
1977struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1978 const char *attr_name, u64 *attr_size)
1979{
1980 int err;
1981 struct p9_req_t *req;
1982 struct p9_client *clnt;
1983 struct p9_fid *attr_fid;
1984
1985 err = 0;
1986 clnt = file_fid->clnt;
1987 attr_fid = p9_fid_create(clnt);
1988 if (IS_ERR(attr_fid)) {
1989 err = PTR_ERR(attr_fid);
1990 attr_fid = NULL;
1991 goto error;
1992 }
5d385153 1993 p9_debug(P9_DEBUG_9P,
0ef63f34
AK		 1994 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1995 file_fid->fid, attr_fid->fid, attr_name);
1996
1997 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1998 file_fid->fid, attr_fid->fid, attr_name);
1999 if (IS_ERR(req)) {
2000 err = PTR_ERR(req);
2001 goto error;
2002 }
2003 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2004 if (err) {
348b5901 2005 trace_9p_protocol_dump(clnt, req->rc);
0ef63f34
AK		 2006 p9_free_req(clnt, req);
2007 goto clunk_fid;
2008 }
2009 p9_free_req(clnt, req);
5d385153 2010 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
0ef63f34
AK		 2011 attr_fid->fid, *attr_size);
2012 return attr_fid;
2013clunk_fid:
2014 p9_client_clunk(attr_fid);
2015 attr_fid = NULL;
2016error:
2017 if (attr_fid && (attr_fid != file_fid))
2018 p9_fid_destroy(attr_fid);
2019
2020 return ERR_PTR(err);
2021}
2022EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2023
eda25e46
AK		 2024int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2025 u64 attr_size, int flags)
2026{
2027 int err;
2028 struct p9_req_t *req;
2029 struct p9_client *clnt;
2030
5d385153 2031 p9_debug(P9_DEBUG_9P,
eda25e46
AK		 2032 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2033 fid->fid, name, (long long)attr_size, flags);
2034 err = 0;
2035 clnt = fid->clnt;
2036 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2037 fid->fid, name, attr_size, flags);
2038 if (IS_ERR(req)) {
2039 err = PTR_ERR(req);
2040 goto error;
2041 }
5d385153 2042 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
eda25e46
AK		 2043 p9_free_req(clnt, req);
2044error:
2045 return err;
2046}
2047EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2048
7751bdb3
SK		 2049int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2050{
abfa034e 2051 int err, rsize, non_zc = 0;
7751bdb3
SK		 2052 struct p9_client *clnt;
2053 struct p9_req_t *req;
2054 char *dataptr;
2055
5d385153 2056 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
95c96174 2057 fid->fid, (unsigned long long) offset, count);
7751bdb3
SK		 2058
2059 err = 0;
2060 clnt = fid->clnt;
7751bdb3
SK		 2061
2062 rsize = fid->iounit;
2063 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2064 rsize = clnt->msize - P9_READDIRHDRSZ;
2065
2066 if (count < rsize)
2067 rsize = count;
2068
abfa034e
AK		 2069 /* Don't bother zerocopy for small IO (< 1024) */
2070 if (clnt->trans_mod->zc_request && rsize > 1024) {
2071 /*
2072 * response header len is 11
2073 * PDU Header(7) + IO Size (4)
2074 */
2075 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2076 11, 1, "dqd", fid->fid, offset, rsize);
2c66523f 2077 } else {
abfa034e 2078 non_zc = 1;
2c66523f 2079 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
abfa034e 2080 offset, rsize);
2c66523f 2081 }
7751bdb3
SK		 2082 if (IS_ERR(req)) {
2083 err = PTR_ERR(req);
2084 goto error;
2085 }
2086
2087 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2088 if (err) {
348b5901 2089 trace_9p_protocol_dump(clnt, req->rc);
7751bdb3
SK		 2090 goto free_and_error;
2091 }
2092
5d385153 2093 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
7751bdb3 2094
abfa034e 2095 if (non_zc)
7751bdb3
SK		 2096 memmove(data, dataptr, count);
2097
2098 p9_free_req(clnt, req);
2099 return count;
2100
2101free_and_error:
2102 p9_free_req(clnt, req);
2103error:
2104 return err;
2105}
2106EXPORT_SYMBOL(p9_client_readdir);
4b43516a
MK		 2107
2108int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2109 dev_t rdev, gid_t gid, struct p9_qid *qid)
2110{
2111 int err;
2112 struct p9_client *clnt;
2113 struct p9_req_t *req;
2114
2115 err = 0;
2116 clnt = fid->clnt;
5d385153 2117 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
4b43516a
MK		 2118 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2119 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
2120 MAJOR(rdev), MINOR(rdev), gid);
2121 if (IS_ERR(req))
2122 return PTR_ERR(req);
2123
2124 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2125 if (err) {
348b5901 2126 trace_9p_protocol_dump(clnt, req->rc);
4b43516a
MK		 2127 goto error;
2128 }
5d385153 2129 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
4b43516a
MK		 2130 (unsigned long long)qid->path, qid->version);
2131
2132error:
2133 p9_free_req(clnt, req);
2134 return err;
2135
2136}
2137EXPORT_SYMBOL(p9_client_mknod_dotl);
01a622bd
MK		 2138
2139int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2140 gid_t gid, struct p9_qid *qid)
2141{
2142 int err;
2143 struct p9_client *clnt;
2144 struct p9_req_t *req;
2145
2146 err = 0;
2147 clnt = fid->clnt;
5d385153 2148 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
01a622bd
MK		 2149 fid->fid, name, mode, gid);
2150 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
2151 gid);
2152 if (IS_ERR(req))
2153 return PTR_ERR(req);
2154
2155 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2156 if (err) {
348b5901 2157 trace_9p_protocol_dump(clnt, req->rc);
01a622bd
MK		 2158 goto error;
2159 }
5d385153 2160 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
01a622bd
MK		 2161 (unsigned long long)qid->path, qid->version);
2162
2163error:
2164 p9_free_req(clnt, req);
2165 return err;
2166
2167}
2168EXPORT_SYMBOL(p9_client_mkdir_dotl);
a099027c
MK		 2169
2170int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2171{
2172 int err;
2173 struct p9_client *clnt;
2174 struct p9_req_t *req;
2175
2176 err = 0;
2177 clnt = fid->clnt;
5d385153 2178 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
a099027c
MK		 2179 "start %lld length %lld proc_id %d client_id %s\n",
2180 fid->fid, flock->type, flock->flags, flock->start,
2181 flock->length, flock->proc_id, flock->client_id);
2182
2183 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2184 flock->flags, flock->start, flock->length,
2185 flock->proc_id, flock->client_id);
2186
2187 if (IS_ERR(req))
2188 return PTR_ERR(req);
2189
2190 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2191 if (err) {
348b5901 2192 trace_9p_protocol_dump(clnt, req->rc);
a099027c
MK		 2193 goto error;
2194 }
5d385153 2195 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
a099027c
MK		 2196error:
2197 p9_free_req(clnt, req);
2198 return err;
2199
2200}
2201EXPORT_SYMBOL(p9_client_lock_dotl);
1d769cd1
MK		 2202
2203int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2204{
2205 int err;
2206 struct p9_client *clnt;
2207 struct p9_req_t *req;
2208
2209 err = 0;
2210 clnt = fid->clnt;
5d385153 2211 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
1d769cd1
MK		 2212 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2213 glock->start, glock->length, glock->proc_id, glock->client_id);
2214
2215 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2216 glock->start, glock->length, glock->proc_id, glock->client_id);
2217
2218 if (IS_ERR(req))
2219 return PTR_ERR(req);
2220
2221 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2222 &glock->start, &glock->length, &glock->proc_id,
2223 &glock->client_id);
2224 if (err) {
348b5901 2225 trace_9p_protocol_dump(clnt, req->rc);
1d769cd1
MK		 2226 goto error;
2227 }
5d385153 2228 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
1d769cd1
MK		 2229 "proc_id %d client_id %s\n", glock->type, glock->start,
2230 glock->length, glock->proc_id, glock->client_id);
2231error:
2232 p9_free_req(clnt, req);
2233 return err;
2234}
2235EXPORT_SYMBOL(p9_client_getlock_dotl);
329176cc
MK		 2236
2237int p9_client_readlink(struct p9_fid *fid, char **target)
2238{
2239 int err;
2240 struct p9_client *clnt;
2241 struct p9_req_t *req;
2242
2243 err = 0;
2244 clnt = fid->clnt;
5d385153 2245 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
329176cc
MK		 2246
2247 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2248 if (IS_ERR(req))
2249 return PTR_ERR(req);
2250
2251 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2252 if (err) {
348b5901 2253 trace_9p_protocol_dump(clnt, req->rc);
329176cc
MK		 2254 goto error;
2255 }
5d385153 2256 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
329176cc
MK		 2257error:
2258 p9_free_req(clnt, req);
2259 return err;
2260}
2261EXPORT_SYMBOL(p9_client_readlink);
Linux kernel - Deliverables
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