]> git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blame - net/9p/client.c
9p: switch p9_client_write() to passing it struct iov_iter *
[mirror_ubuntu-zesty-kernel.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>
4f3b35c1 37#include <linux/uio.h>
bd238fb4 38#include <net/9p/9p.h>
fb0466c3 39#include <linux/parser.h>
bd238fb4 40#include <net/9p/client.h>
8b81ef58 41#include <net/9p/transport.h>
51a87c55 42#include "protocol.h"
bd238fb4 43
348b5901
AK
44#define CREATE_TRACE_POINTS
45#include <trace/events/9p.h>
46
8a0dc95f
EVH
47/*
48 * Client Option Parsing (code inspired by NFS code)
49 * - a little lazy - parse all client options
50 */
51
52enum {
53 Opt_msize,
54 Opt_trans,
55 Opt_legacy,
0fb80abd 56 Opt_version,
8a0dc95f
EVH
57 Opt_err,
58};
59
a447c093 60static const match_table_t tokens = {
8a0dc95f
EVH
61 {Opt_msize, "msize=%u"},
62 {Opt_legacy, "noextend"},
63 {Opt_trans, "trans=%s"},
0fb80abd 64 {Opt_version, "version=%s"},
8a0dc95f
EVH
65 {Opt_err, NULL},
66};
67
342fee1d
SK
68inline int p9_is_proto_dotl(struct p9_client *clnt)
69{
a02cec21 70 return clnt->proto_version == p9_proto_2000L;
342fee1d
SK
71}
72EXPORT_SYMBOL(p9_is_proto_dotl);
73
74inline int p9_is_proto_dotu(struct p9_client *clnt)
75{
a02cec21 76 return clnt->proto_version == p9_proto_2000u;
342fee1d
SK
77}
78EXPORT_SYMBOL(p9_is_proto_dotu);
79
43def35c
SD
80/*
81 * Some error codes are taken directly from the server replies,
82 * make sure they are valid.
83 */
84static int safe_errno(int err)
85{
86 if ((err > 0) || (err < -MAX_ERRNO)) {
87 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
88 return -EPROTO;
89 }
90 return err;
91}
92
93
0fb80abd 94/* Interpret mount option for protocol version */
4d63055f 95static int get_protocol_version(char *s)
0fb80abd 96{
3dc9fef6
DC
97 int version = -EINVAL;
98
4d63055f 99 if (!strcmp(s, "9p2000")) {
0fb80abd 100 version = p9_proto_legacy;
5d385153 101 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
4d63055f 102 } else if (!strcmp(s, "9p2000.u")) {
0fb80abd 103 version = p9_proto_2000u;
5d385153 104 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
4d63055f 105 } else if (!strcmp(s, "9p2000.L")) {
45bc21ed 106 version = p9_proto_2000L;
5d385153 107 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
4d63055f 108 } else
5d385153 109 pr_info("Unknown protocol version %s\n", s);
4d63055f 110
0fb80abd
SK
111 return version;
112}
113
8a0dc95f 114/**
0e15597e
AK
115 * parse_options - parse mount options into client structure
116 * @opts: options string passed from mount
117 * @clnt: existing v9fs client information
8a0dc95f 118 *
bb8ffdfc 119 * Return 0 upon success, -ERRNO upon failure
8a0dc95f
EVH
120 */
121
bb8ffdfc 122static int parse_opts(char *opts, struct p9_client *clnt)
8a0dc95f 123{
d8c8a9e3 124 char *options, *tmp_options;
8a0dc95f
EVH
125 char *p;
126 substring_t args[MAX_OPT_ARGS];
127 int option;
4d63055f 128 char *s;
bb8ffdfc 129 int ret = 0;
8a0dc95f 130
095e7999 131 clnt->proto_version = p9_proto_2000L;
8a0dc95f
EVH
132 clnt->msize = 8192;
133
bb8ffdfc
EVH
134 if (!opts)
135 return 0;
136
d8c8a9e3
EVH
137 tmp_options = kstrdup(opts, GFP_KERNEL);
138 if (!tmp_options) {
5d385153
JP
139 p9_debug(P9_DEBUG_ERROR,
140 "failed to allocate copy of option string\n");
bb8ffdfc
EVH
141 return -ENOMEM;
142 }
d8c8a9e3 143 options = tmp_options;
8a0dc95f
EVH
144
145 while ((p = strsep(&options, ",")) != NULL) {
4d5077f1 146 int token, r;
8a0dc95f
EVH
147 if (!*p)
148 continue;
149 token = match_token(p, tokens, args);
4d5077f1
AK
150 switch (token) {
151 case Opt_msize:
152 r = match_int(&args[0], &option);
bb8ffdfc 153 if (r < 0) {
5d385153
JP
154 p9_debug(P9_DEBUG_ERROR,
155 "integer field, but no integer?\n");
bb8ffdfc 156 ret = r;
8a0dc95f
EVH
157 continue;
158 }
8a0dc95f
EVH
159 clnt->msize = option;
160 break;
161 case Opt_trans:
4d63055f
PK
162 s = match_strdup(&args[0]);
163 if (!s) {
164 ret = -ENOMEM;
5d385153
JP
165 p9_debug(P9_DEBUG_ERROR,
166 "problem allocating copy of trans arg\n");
4d63055f
PK
167 goto free_and_return;
168 }
169 clnt->trans_mod = v9fs_get_trans_by_name(s);
170 if (clnt->trans_mod == NULL) {
5d385153
JP
171 pr_info("Could not find request transport: %s\n",
172 s);
349d3bb8 173 ret = -EINVAL;
4d63055f 174 kfree(s);
349d3bb8
EVH
175 goto free_and_return;
176 }
4d63055f 177 kfree(s);
8a0dc95f
EVH
178 break;
179 case Opt_legacy:
342fee1d 180 clnt->proto_version = p9_proto_legacy;
8a0dc95f 181 break;
0fb80abd 182 case Opt_version:
4d63055f
PK
183 s = match_strdup(&args[0]);
184 if (!s) {
185 ret = -ENOMEM;
5d385153
JP
186 p9_debug(P9_DEBUG_ERROR,
187 "problem allocating copy of version arg\n");
0fb80abd 188 goto free_and_return;
4d63055f
PK
189 }
190 ret = get_protocol_version(s);
191 if (ret == -EINVAL) {
192 kfree(s);
193 goto free_and_return;
194 }
195 kfree(s);
0fb80abd
SK
196 clnt->proto_version = ret;
197 break;
8a0dc95f
EVH
198 default:
199 continue;
200 }
201 }
72029fe8 202
349d3bb8 203free_and_return:
d8c8a9e3 204 kfree(tmp_options);
bb8ffdfc 205 return ret;
8a0dc95f
EVH
206}
207
05a782d4 208static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
5387320d
SD
209{
210 struct p9_fcall *fc;
211 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
212 if (!fc)
213 return NULL;
214 fc->capacity = alloc_msize;
215 fc->sdata = (char *) fc + sizeof(struct p9_fcall);
216 return fc;
217}
218
fea511a6
EVH
219/**
220 * p9_tag_alloc - lookup/allocate a request by tag
221 * @c: client session to lookup tag within
222 * @tag: numeric id for transaction
223 *
224 * this is a simple array lookup, but will grow the
25985edc 225 * request_slots as necessary to accommodate transaction
fea511a6
EVH
226 * ids which did not previously have a slot.
227 *
228 * this code relies on the client spinlock to manage locks, its
229 * possible we should switch to something else, but I'd rather
230 * stick with something low-overhead for the common case.
231 *
232 */
233
ef6b0807
DC
234static struct p9_req_t *
235p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
fea511a6
EVH
236{
237 unsigned long flags;
238 int row, col;
51a87c55 239 struct p9_req_t *req;
abfa034e 240 int alloc_msize = min(c->msize, max_size);
fea511a6
EVH
241
242 /* This looks up the original request by tag so we know which
243 * buffer to read the data into */
244 tag++;
245
246 if (tag >= c->max_tag) {
247 spin_lock_irqsave(&c->lock, flags);
248 /* check again since original check was outside of lock */
249 while (tag >= c->max_tag) {
250 row = (tag / P9_ROW_MAXTAG);
251 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
252 sizeof(struct p9_req_t), GFP_ATOMIC);
253
254 if (!c->reqs[row]) {
5d385153 255 pr_err("Couldn't grow tag array\n");
e45c5405 256 spin_unlock_irqrestore(&c->lock, flags);
51a87c55 257 return ERR_PTR(-ENOMEM);
fea511a6
EVH
258 }
259 for (col = 0; col < P9_ROW_MAXTAG; col++) {
260 c->reqs[row][col].status = REQ_STATUS_IDLE;
51a87c55 261 c->reqs[row][col].tc = NULL;
fea511a6
EVH
262 }
263 c->max_tag += P9_ROW_MAXTAG;
264 }
265 spin_unlock_irqrestore(&c->lock, flags);
266 }
267 row = tag / P9_ROW_MAXTAG;
268 col = tag % P9_ROW_MAXTAG;
269
51a87c55 270 req = &c->reqs[row][col];
5387320d 271 if (!req->wq) {
eeff66ef 272 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
ea071aa1
SD
273 if (!req->wq)
274 goto grow_failed;
51a87c55 275 init_waitqueue_head(req->wq);
ea071aa1 276 }
ea071aa1 277
5387320d
SD
278 if (!req->tc)
279 req->tc = p9_fcall_alloc(alloc_msize);
280 if (!req->rc)
281 req->rc = p9_fcall_alloc(alloc_msize);
282 if (!req->tc || !req->rc)
283 goto grow_failed;
51a87c55
EVH
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 290
ea071aa1
SD
291 return req;
292
293grow_failed:
294 pr_err("Couldn't grow tag array\n");
295 kfree(req->tc);
296 kfree(req->rc);
297 kfree(req->wq);
298 req->tc = req->rc = NULL;
299 req->wq = NULL;
300 return ERR_PTR(-ENOMEM);
fea511a6 301}
fea511a6
EVH
302
303/**
304 * p9_tag_lookup - lookup a request by tag
305 * @c: client session to lookup tag within
306 * @tag: numeric id for transaction
307 *
308 */
309
310struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
311{
312 int row, col;
313
314 /* This looks up the original request by tag so we know which
315 * buffer to read the data into */
316 tag++;
317
b85f7d92
EVH
318 if(tag >= c->max_tag)
319 return NULL;
fea511a6
EVH
320
321 row = tag / P9_ROW_MAXTAG;
322 col = tag % P9_ROW_MAXTAG;
323
324 return &c->reqs[row][col];
325}
326EXPORT_SYMBOL(p9_tag_lookup);
327
328/**
329 * p9_tag_init - setup tags structure and contents
0e15597e 330 * @c: v9fs client struct
fea511a6
EVH
331 *
332 * This initializes the tags structure for each client instance.
333 *
334 */
335
336static int p9_tag_init(struct p9_client *c)
337{
338 int err = 0;
339
340 c->tagpool = p9_idpool_create();
341 if (IS_ERR(c->tagpool)) {
342 err = PTR_ERR(c->tagpool);
fea511a6
EVH
343 goto error;
344 }
fe1cbaba
AK
345 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
346 if (err < 0) {
347 p9_idpool_destroy(c->tagpool);
348 goto error;
349 }
fea511a6
EVH
350 c->max_tag = 0;
351error:
352 return err;
353}
354
355/**
356 * p9_tag_cleanup - cleans up tags structure and reclaims resources
0e15597e 357 * @c: v9fs client struct
fea511a6
EVH
358 *
359 * This frees resources associated with the tags structure
360 *
361 */
362static void p9_tag_cleanup(struct p9_client *c)
363{
364 int row, col;
365
366 /* check to insure all requests are idle */
367 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
368 for (col = 0; col < P9_ROW_MAXTAG; col++) {
369 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
5d385153
JP
370 p9_debug(P9_DEBUG_MUX,
371 "Attempting to cleanup non-free tag %d,%d\n",
372 row, col);
fea511a6
EVH
373 /* TODO: delay execution of cleanup */
374 return;
375 }
376 }
377 }
378
62b2be59
LI
379 if (c->tagpool) {
380 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
fea511a6 381 p9_idpool_destroy(c->tagpool);
62b2be59 382 }
fea511a6
EVH
383
384 /* free requests associated with tags */
385 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
51a87c55 386 for (col = 0; col < P9_ROW_MAXTAG; col++) {
fea511a6 387 kfree(c->reqs[row][col].wq);
51a87c55
EVH
388 kfree(c->reqs[row][col].tc);
389 kfree(c->reqs[row][col].rc);
390 }
fea511a6
EVH
391 kfree(c->reqs[row]);
392 }
393 c->max_tag = 0;
394}
395
673d62cd
EVH
396/**
397 * p9_free_req - free a request and clean-up as necessary
398 * c: client state
399 * r: request to release
400 *
401 */
402
51a87c55 403static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
673d62cd 404{
51a87c55 405 int tag = r->tc->tag;
5d385153 406 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
51a87c55 407
673d62cd 408 r->status = REQ_STATUS_IDLE;
51a87c55
EVH
409 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
410 p9_idpool_put(tag, c->tagpool);
673d62cd
EVH
411}
412
91b8534f
EVH
413/**
414 * p9_client_cb - call back from transport to client
415 * c: client state
416 * req: request received
417 *
418 */
2b6e72ed 419void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
91b8534f 420{
5d385153 421 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
2b6e72ed
DM
422
423 /*
424 * This barrier is needed to make sure any change made to req before
425 * the other thread wakes up will indeed be seen by the waiting side.
426 */
427 smp_wmb();
428 req->status = status;
429
1bab88b2 430 wake_up(req->wq);
5d385153 431 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
91b8534f
EVH
432}
433EXPORT_SYMBOL(p9_client_cb);
434
51a87c55
EVH
435/**
436 * p9_parse_header - parse header arguments out of a packet
437 * @pdu: packet to parse
438 * @size: size of packet
439 * @type: type of request
440 * @tag: tag of packet
441 * @rewind: set if we need to rewind offset afterwards
442 */
443
444int
445p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
446 int rewind)
447{
448 int8_t r_type;
449 int16_t r_tag;
450 int32_t r_size;
451 int offset = pdu->offset;
452 int err;
453
454 pdu->offset = 0;
455 if (pdu->size == 0)
456 pdu->size = 7;
457
458 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
459 if (err)
460 goto rewind_and_exit;
461
462 pdu->size = r_size;
463 pdu->id = r_type;
464 pdu->tag = r_tag;
465
5d385153
JP
466 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
467 pdu->size, pdu->id, pdu->tag);
51a87c55
EVH
468
469 if (type)
470 *type = r_type;
471 if (tag)
472 *tag = r_tag;
473 if (size)
474 *size = r_size;
475
476
477rewind_and_exit:
478 if (rewind)
479 pdu->offset = offset;
480 return err;
481}
482EXPORT_SYMBOL(p9_parse_header);
483
484/**
485 * p9_check_errors - check 9p packet for error return and process it
486 * @c: current client instance
487 * @req: request to parse and check for error conditions
488 *
489 * returns error code if one is discovered, otherwise returns 0
490 *
491 * this will have to be more complicated if we have multiple
492 * error packet types
493 */
494
495static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
496{
497 int8_t type;
498 int err;
ca41bb3e 499 int ecode;
51a87c55
EVH
500
501 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
348b5901
AK
502 /*
503 * dump the response from server
504 * This should be after check errors which poplulate pdu_fcall.
505 */
506 trace_9p_protocol_dump(c, req->rc);
51a87c55 507 if (err) {
5d385153 508 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
51a87c55
EVH
509 return err;
510 }
ca41bb3e
VJJ
511 if (type != P9_RERROR && type != P9_RLERROR)
512 return 0;
4f7ebe80 513
ca41bb3e
VJJ
514 if (!p9_is_proto_dotl(c)) {
515 char *ename;
ca41bb3e 516 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
abfa034e 517 &ename, &ecode);
ca41bb3e
VJJ
518 if (err)
519 goto out_err;
4f7ebe80 520
ca41bb3e
VJJ
521 if (p9_is_proto_dotu(c))
522 err = -ecode;
4f7ebe80 523
ca41bb3e
VJJ
524 if (!err || !IS_ERR_VALUE(err)) {
525 err = p9_errstr2errno(ename, strlen(ename));
4f7ebe80 526
5d385153
JP
527 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
528 -ecode, ename);
4f7ebe80 529 }
abfa034e 530 kfree(ename);
ca41bb3e
VJJ
531 } else {
532 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
533 err = -ecode;
534
5d385153 535 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
ca41bb3e 536 }
51a87c55 537
51a87c55 538 return err;
4f7ebe80
AB
539
540out_err:
5d385153 541 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
4f7ebe80
AB
542
543 return err;
51a87c55
EVH
544}
545
abfa034e
AK
546/**
547 * p9_check_zc_errors - check 9p packet for error return and process it
548 * @c: current client instance
549 * @req: request to parse and check for error conditions
550 * @in_hdrlen: Size of response protocol buffer.
551 *
552 * returns error code if one is discovered, otherwise returns 0
553 *
554 * this will have to be more complicated if we have multiple
555 * error packet types
556 */
557
558static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
4f3b35c1 559 struct iov_iter *uidata, int in_hdrlen)
abfa034e
AK
560{
561 int err;
562 int ecode;
563 int8_t type;
564 char *ename = NULL;
565
566 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
348b5901
AK
567 /*
568 * dump the response from server
569 * This should be after parse_header which poplulate pdu_fcall.
570 */
571 trace_9p_protocol_dump(c, req->rc);
abfa034e 572 if (err) {
5d385153 573 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
abfa034e
AK
574 return err;
575 }
576
577 if (type != P9_RERROR && type != P9_RLERROR)
578 return 0;
579
580 if (!p9_is_proto_dotl(c)) {
581 /* Error is reported in string format */
42fe6484
AK
582 int len;
583 /* 7 = header size for RERROR; */
584 int inline_len = in_hdrlen - 7;
abfa034e 585
42fe6484
AK
586 len = req->rc->size - req->rc->offset;
587 if (len > (P9_ZC_HDR_SZ - 7)) {
588 err = -EFAULT;
abfa034e
AK
589 goto out_err;
590 }
abfa034e 591
42fe6484
AK
592 ename = &req->rc->sdata[req->rc->offset];
593 if (len > inline_len) {
594 /* We have error in external buffer */
4f3b35c1
AV
595 err = copy_from_iter(ename + inline_len,
596 len - inline_len, uidata);
597 if (err != len - inline_len) {
598 err = -EFAULT;
599 goto out_err;
abfa034e
AK
600 }
601 }
42fe6484
AK
602 ename = NULL;
603 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
604 &ename, &ecode);
605 if (err)
606 goto out_err;
607
608 if (p9_is_proto_dotu(c))
abfa034e 609 err = -ecode;
42fe6484 610
abfa034e
AK
611 if (!err || !IS_ERR_VALUE(err)) {
612 err = p9_errstr2errno(ename, strlen(ename));
613
5d385153
JP
614 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
615 -ecode, ename);
abfa034e
AK
616 }
617 kfree(ename);
618 } else {
619 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
620 err = -ecode;
621
5d385153 622 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
abfa034e
AK
623 }
624 return err;
625
abfa034e 626out_err:
5d385153 627 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
abfa034e
AK
628 return err;
629}
630
aca00763
RL
631static struct p9_req_t *
632p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
633
51a87c55
EVH
634/**
635 * p9_client_flush - flush (cancel) a request
0e15597e
AK
636 * @c: client state
637 * @oldreq: request to cancel
51a87c55 638 *
aca00763 639 * This sents a flush for a particular request and links
51a87c55
EVH
640 * the flush request to the original request. The current
641 * code only supports a single flush request although the protocol
642 * allows for multiple flush requests to be sent for a single request.
643 *
644 */
645
646static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
647{
648 struct p9_req_t *req;
649 int16_t oldtag;
650 int err;
651
652 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
653 if (err)
654 return err;
655
5d385153 656 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
51a87c55
EVH
657
658 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
659 if (IS_ERR(req))
660 return PTR_ERR(req);
661
1cff3306
SD
662 /*
663 * if we haven't received a response for oldreq,
60ff779c 664 * remove it from the list
1cff3306 665 */
0bfd6845 666 if (oldreq->status == REQ_STATUS_SENT)
afd8d654
SD
667 if (c->trans_mod->cancelled)
668 c->trans_mod->cancelled(c, oldreq);
1bab88b2
LI
669
670 p9_free_req(c, req);
51a87c55
EVH
671 return 0;
672}
673
abfa034e
AK
674static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
675 int8_t type, int req_size,
676 const char *fmt, va_list ap)
91b8534f 677{
51a87c55 678 int tag, err;
91b8534f 679 struct p9_req_t *req;
91b8534f 680
5d385153 681 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
91b8534f 682
6d96d3ab
AK
683 /* we allow for any status other than disconnected */
684 if (c->status == Disconnected)
685 return ERR_PTR(-EIO);
686
687 /* if status is begin_disconnected we allow only clunk request */
688 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
51a87c55 689 return ERR_PTR(-EIO);
91b8534f 690
91b8534f 691 tag = P9_NOTAG;
51a87c55 692 if (type != P9_TVERSION) {
91b8534f
EVH
693 tag = p9_idpool_get(c->tagpool);
694 if (tag < 0)
51a87c55 695 return ERR_PTR(-ENOMEM);
91b8534f
EVH
696 }
697
abfa034e 698 req = p9_tag_alloc(c, tag, req_size);
51a87c55
EVH
699 if (IS_ERR(req))
700 return req;
91b8534f 701
51a87c55
EVH
702 /* marshall the data */
703 p9pdu_prepare(req->tc, tag, type);
342fee1d 704 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
7b3bb3fe
AK
705 if (err)
706 goto reterr;
348b5901
AK
707 p9pdu_finalize(c, req->tc);
708 trace_9p_client_req(c, type, tag);
abfa034e
AK
709 return req;
710reterr:
711 p9_free_req(c, req);
712 return ERR_PTR(err);
713}
714
715/**
716 * p9_client_rpc - issue a request and wait for a response
717 * @c: client session
718 * @type: type of request
719 * @fmt: protocol format string (see protocol.c)
720 *
721 * Returns request structure (which client must free using p9_free_req)
722 */
723
724static struct p9_req_t *
725p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
726{
727 va_list ap;
728 int sigpending, err;
729 unsigned long flags;
730 struct p9_req_t *req;
731
732 va_start(ap, fmt);
733 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
734 va_end(ap);
735 if (IS_ERR(req))
736 return req;
737
738 if (signal_pending(current)) {
739 sigpending = 1;
740 clear_thread_flag(TIF_SIGPENDING);
741 } else
742 sigpending = 0;
91b8534f
EVH
743
744 err = c->trans_mod->request(c, req);
745 if (err < 0) {
3cd79678 746 if (err != -ERESTARTSYS && err != -EFAULT)
52f44e0d 747 c->status = Disconnected;
91b8534f
EVH
748 goto reterr;
749 }
a314f274 750again:
abfa034e 751 /* Wait for the response */
91b8534f 752 err = wait_event_interruptible(*req->wq,
abfa034e 753 req->status >= REQ_STATUS_RCVD);
91b8534f 754
2b6e72ed
DM
755 /*
756 * Make sure our req is coherent with regard to updates in other
757 * threads - echoes to wmb() in the callback
758 */
759 smp_rmb();
760
a314f274
JG
761 if ((err == -ERESTARTSYS) && (c->status == Connected)
762 && (type == P9_TFLUSH)) {
763 sigpending = 1;
764 clear_thread_flag(TIF_SIGPENDING);
765 goto again;
766 }
767
91b8534f 768 if (req->status == REQ_STATUS_ERROR) {
5d385153 769 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
91b8534f 770 err = req->t_err;
91b8534f 771 }
1bab88b2 772 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
5d385153 773 p9_debug(P9_DEBUG_MUX, "flushing\n");
91b8534f 774 sigpending = 1;
91b8534f
EVH
775 clear_thread_flag(TIF_SIGPENDING);
776
1bab88b2
LI
777 if (c->trans_mod->cancel(c, req))
778 p9_client_flush(c, req);
779
780 /* if we received the response anyway, don't signal error */
781 if (req->status == REQ_STATUS_RCVD)
782 err = 0;
91b8534f 783 }
91b8534f
EVH
784 if (sigpending) {
785 spin_lock_irqsave(&current->sighand->siglock, flags);
786 recalc_sigpending();
787 spin_unlock_irqrestore(&current->sighand->siglock, flags);
788 }
91b8534f
EVH
789 if (err < 0)
790 goto reterr;
791
51a87c55 792 err = p9_check_errors(c, req);
348b5901
AK
793 trace_9p_client_res(c, type, req->rc->tag, err);
794 if (!err)
51a87c55 795 return req;
abfa034e 796reterr:
abfa034e 797 p9_free_req(c, req);
43def35c 798 return ERR_PTR(safe_errno(err));
abfa034e
AK
799}
800
801/**
802 * p9_client_zc_rpc - issue a request and wait for a response
803 * @c: client session
804 * @type: type of request
4f3b35c1
AV
805 * @uidata: destination for zero copy read
806 * @uodata: source for zero copy write
abfa034e
AK
807 * @inlen: read buffer size
808 * @olen: write buffer size
809 * @hdrlen: reader header size, This is the size of response protocol data
810 * @fmt: protocol format string (see protocol.c)
811 *
812 * Returns request structure (which client must free using p9_free_req)
813 */
814static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
4f3b35c1
AV
815 struct iov_iter *uidata,
816 struct iov_iter *uodata,
abfa034e 817 int inlen, int olen, int in_hdrlen,
4f3b35c1 818 const char *fmt, ...)
abfa034e
AK
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
abfa034e 841 err = c->trans_mod->zc_request(c, req, uidata, uodata,
4f3b35c1 842 inlen, olen, in_hdrlen);
abfa034e
AK
843 if (err < 0) {
844 if (err == -EIO)
845 c->status = Disconnected;
846 goto reterr;
847 }
848 if (req->status == REQ_STATUS_ERROR) {
5d385153 849 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
abfa034e
AK
850 err = req->t_err;
851 }
852 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
5d385153 853 p9_debug(P9_DEBUG_MUX, "flushing\n");
abfa034e
AK
854 sigpending = 1;
855 clear_thread_flag(TIF_SIGPENDING);
91b8534f 856
abfa034e
AK
857 if (c->trans_mod->cancel(c, req))
858 p9_client_flush(c, req);
859
860 /* if we received the response anyway, don't signal error */
861 if (req->status == REQ_STATUS_RCVD)
862 err = 0;
863 }
864 if (sigpending) {
865 spin_lock_irqsave(&current->sighand->siglock, flags);
866 recalc_sigpending();
867 spin_unlock_irqrestore(&current->sighand->siglock, flags);
868 }
869 if (err < 0)
870 goto reterr;
871
4f3b35c1 872 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
348b5901
AK
873 trace_9p_client_res(c, type, req->rc->tag, err);
874 if (!err)
abfa034e 875 return req;
91b8534f
EVH
876reterr:
877 p9_free_req(c, req);
43def35c 878 return ERR_PTR(safe_errno(err));
91b8534f
EVH
879}
880
5503ac56
EVH
881static struct p9_fid *p9_fid_create(struct p9_client *clnt)
882{
9f3e9bbe 883 int ret;
5503ac56 884 struct p9_fid *fid;
cac23d65 885 unsigned long flags;
5503ac56 886
5d385153 887 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
5503ac56
EVH
888 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
889 if (!fid)
890 return ERR_PTR(-ENOMEM);
891
9f3e9bbe 892 ret = p9_idpool_get(clnt->fidpool);
24e94de4 893 if (ret < 0) {
9f3e9bbe 894 ret = -ENOSPC;
5503ac56
EVH
895 goto error;
896 }
9f3e9bbe 897 fid->fid = ret;
5503ac56
EVH
898
899 memset(&fid->qid, 0, sizeof(struct p9_qid));
900 fid->mode = -1;
f8b9d53a 901 fid->uid = current_fsuid();
5503ac56 902 fid->clnt = clnt;
3e2796a9 903 fid->rdir = NULL;
cac23d65 904 spin_lock_irqsave(&clnt->lock, flags);
5503ac56 905 list_add(&fid->flist, &clnt->fidlist);
cac23d65 906 spin_unlock_irqrestore(&clnt->lock, flags);
5503ac56
EVH
907
908 return fid;
909
910error:
911 kfree(fid);
9f3e9bbe 912 return ERR_PTR(ret);
5503ac56
EVH
913}
914
915static void p9_fid_destroy(struct p9_fid *fid)
916{
917 struct p9_client *clnt;
cac23d65 918 unsigned long flags;
5503ac56 919
5d385153 920 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
5503ac56
EVH
921 clnt = fid->clnt;
922 p9_idpool_put(fid->fid, clnt->fidpool);
cac23d65 923 spin_lock_irqsave(&clnt->lock, flags);
5503ac56 924 list_del(&fid->flist);
cac23d65 925 spin_unlock_irqrestore(&clnt->lock, flags);
3e2796a9 926 kfree(fid->rdir);
5503ac56
EVH
927 kfree(fid);
928}
8a0dc95f 929
32a875ad 930static int p9_client_version(struct p9_client *c)
bd238fb4 931{
6936bf60 932 int err = 0;
51a87c55
EVH
933 struct p9_req_t *req;
934 char *version;
935 int msize;
bd238fb4 936
5d385153
JP
937 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
938 c->msize, c->proto_version);
c5a7697d
SK
939
940 switch (c->proto_version) {
45bc21ed 941 case p9_proto_2000L:
c5a7697d 942 req = p9_client_rpc(c, P9_TVERSION, "ds",
45bc21ed 943 c->msize, "9P2000.L");
c5a7697d
SK
944 break;
945 case p9_proto_2000u:
946 req = p9_client_rpc(c, P9_TVERSION, "ds",
947 c->msize, "9P2000.u");
948 break;
949 case p9_proto_legacy:
950 req = p9_client_rpc(c, P9_TVERSION, "ds",
951 c->msize, "9P2000");
952 break;
953 default:
954 return -EINVAL;
c5a7697d
SK
955 }
956
51a87c55
EVH
957 if (IS_ERR(req))
958 return PTR_ERR(req);
6936bf60 959
342fee1d 960 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
51a87c55 961 if (err) {
5d385153 962 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
348b5901 963 trace_9p_protocol_dump(c, req->rc);
6936bf60 964 goto error;
51a87c55 965 }
6936bf60 966
5d385153 967 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
45bc21ed
SK
968 if (!strncmp(version, "9P2000.L", 8))
969 c->proto_version = p9_proto_2000L;
c5a7697d 970 else if (!strncmp(version, "9P2000.u", 8))
342fee1d
SK
971 c->proto_version = p9_proto_2000u;
972 else if (!strncmp(version, "9P2000", 6))
973 c->proto_version = p9_proto_legacy;
6936bf60
EVH
974 else {
975 err = -EREMOTEIO;
976 goto error;
977 }
978
51a87c55
EVH
979 if (msize < c->msize)
980 c->msize = msize;
6936bf60
EVH
981
982error:
51a87c55
EVH
983 kfree(version);
984 p9_free_req(c, req);
6936bf60
EVH
985
986 return err;
987}
6936bf60
EVH
988
989struct p9_client *p9_client_create(const char *dev_name, char *options)
990{
991 int err;
992 struct p9_client *clnt;
50192abe 993 char *client_id;
6936bf60
EVH
994
995 err = 0;
bd238fb4
LI
996 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
997 if (!clnt)
998 return ERR_PTR(-ENOMEM);
999
72029fe8 1000 clnt->trans_mod = NULL;
bb8ffdfc 1001 clnt->trans = NULL;
50192abe
WD
1002
1003 client_id = utsname()->nodename;
1004 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1005
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,
f791f7c5 1103 char *uname, kuid_t 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
f791f7c5 1120 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
51a87c55
EVH
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 1272int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
f791f7c5 1273 kgid_t gid, struct p9_qid *qid)
5643135a
VJJ
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 1281 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
f791f7c5
EB
1282 ofid->fid, name, flags, mode,
1283 from_kgid(&init_user_ns, gid));
5643135a
VJJ
1284 clnt = ofid->clnt;
1285
1286 if (ofid->mode != -1)
1287 return -EINVAL;
1288
f791f7c5 1289 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
5643135a
VJJ
1290 mode, gid);
1291 if (IS_ERR(req)) {
1292 err = PTR_ERR(req);
1293 goto error;
1294 }
1295
1296 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1297 if (err) {
348b5901 1298 trace_9p_protocol_dump(clnt, req->rc);
5643135a
VJJ
1299 goto free_and_error;
1300 }
1301
5d385153 1302 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
5643135a
VJJ
1303 qid->type,
1304 (unsigned long long)qid->path,
1305 qid->version, iounit);
1306
1307 ofid->mode = mode;
1308 ofid->iounit = iounit;
1309
1310free_and_error:
1311 p9_free_req(clnt, req);
1312error:
1313 return err;
1314}
1315EXPORT_SYMBOL(p9_client_create_dotl);
1316
bd238fb4
LI
1317int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1318 char *extension)
1319{
1320 int err;
bd238fb4 1321 struct p9_client *clnt;
51a87c55
EVH
1322 struct p9_req_t *req;
1323 struct p9_qid qid;
1324 int iounit;
bd238fb4 1325
5d385153 1326 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
51a87c55 1327 fid->fid, name, perm, mode);
bd238fb4 1328 err = 0;
bd238fb4
LI
1329 clnt = fid->clnt;
1330
1331 if (fid->mode != -1)
1332 return -EINVAL;
1333
51a87c55
EVH
1334 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1335 mode, extension);
1336 if (IS_ERR(req)) {
1337 err = PTR_ERR(req);
1338 goto error;
bd238fb4
LI
1339 }
1340
342fee1d 1341 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
e7f4b8f1 1342 if (err) {
348b5901 1343 trace_9p_protocol_dump(clnt, req->rc);
e7f4b8f1
EVH
1344 goto free_and_error;
1345 }
51a87c55 1346
5d385153 1347 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
b0d5fdef
RD
1348 qid.type,
1349 (unsigned long long)qid.path,
1350 qid.version, iounit);
bd238fb4
LI
1351
1352 fid->mode = mode;
51a87c55 1353 fid->iounit = iounit;
bd238fb4 1354
e7f4b8f1
EVH
1355free_and_error:
1356 p9_free_req(clnt, req);
51a87c55 1357error:
bd238fb4
LI
1358 return err;
1359}
1360EXPORT_SYMBOL(p9_client_fcreate);
1361
f791f7c5 1362int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
50cc42ff
VJJ
1363 struct p9_qid *qid)
1364{
1365 int err = 0;
1366 struct p9_client *clnt;
1367 struct p9_req_t *req;
1368
5d385153 1369 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
50cc42ff
VJJ
1370 dfid->fid, name, symtgt);
1371 clnt = dfid->clnt;
1372
f791f7c5 1373 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
50cc42ff
VJJ
1374 gid);
1375 if (IS_ERR(req)) {
1376 err = PTR_ERR(req);
1377 goto error;
1378 }
1379
1380 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1381 if (err) {
348b5901 1382 trace_9p_protocol_dump(clnt, req->rc);
50cc42ff
VJJ
1383 goto free_and_error;
1384 }
1385
5d385153 1386 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
50cc42ff
VJJ
1387 qid->type, (unsigned long long)qid->path, qid->version);
1388
1389free_and_error:
1390 p9_free_req(clnt, req);
1391error:
1392 return err;
1393}
1394EXPORT_SYMBOL(p9_client_symlink);
1395
652df9a7
VJJ
1396int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1397{
1398 struct p9_client *clnt;
1399 struct p9_req_t *req;
1400
5d385153 1401 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
652df9a7
VJJ
1402 dfid->fid, oldfid->fid, newname);
1403 clnt = dfid->clnt;
1404 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1405 newname);
1406 if (IS_ERR(req))
1407 return PTR_ERR(req);
1408
5d385153 1409 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
652df9a7
VJJ
1410 p9_free_req(clnt, req);
1411 return 0;
1412}
1413EXPORT_SYMBOL(p9_client_link);
1414
b165d601 1415int p9_client_fsync(struct p9_fid *fid, int datasync)
920e65dc
VJJ
1416{
1417 int err;
1418 struct p9_client *clnt;
1419 struct p9_req_t *req;
1420
5d385153 1421 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
b165d601 1422 fid->fid, datasync);
920e65dc
VJJ
1423 err = 0;
1424 clnt = fid->clnt;
1425
b165d601 1426 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
920e65dc
VJJ
1427 if (IS_ERR(req)) {
1428 err = PTR_ERR(req);
1429 goto error;
1430 }
1431
5d385153 1432 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
920e65dc
VJJ
1433
1434 p9_free_req(clnt, req);
1435
1436error:
1437 return err;
1438}
1439EXPORT_SYMBOL(p9_client_fsync);
1440
bd238fb4
LI
1441int p9_client_clunk(struct p9_fid *fid)
1442{
1443 int err;
bd238fb4 1444 struct p9_client *clnt;
51a87c55 1445 struct p9_req_t *req;
208f3c28 1446 int retries = 0;
bd238fb4 1447
8e44a080 1448 if (!fid) {
5d385153
JP
1449 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1450 __func__, task_pid_nr(current));
8e44a080 1451 dump_stack();
1452 return 0;
1453 }
1454
208f3c28
JG
1455again:
1456 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1457 retries);
bd238fb4 1458 err = 0;
bd238fb4
LI
1459 clnt = fid->clnt;
1460
51a87c55
EVH
1461 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1462 if (IS_ERR(req)) {
1463 err = PTR_ERR(req);
1464 goto error;
bd238fb4
LI
1465 }
1466
5d385153 1467 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
bd238fb4 1468
51a87c55 1469 p9_free_req(clnt, req);
51a87c55 1470error:
5034990e
AK
1471 /*
1472 * Fid is not valid even after a failed clunk
208f3c28
JG
1473 * If interrupted, retry once then give up and
1474 * leak fid until umount.
5034990e 1475 */
208f3c28
JG
1476 if (err == -ERESTARTSYS) {
1477 if (retries++ == 0)
1478 goto again;
1479 } else
1480 p9_fid_destroy(fid);
bd238fb4
LI
1481 return err;
1482}
1483EXPORT_SYMBOL(p9_client_clunk);
1484
1485int p9_client_remove(struct p9_fid *fid)
1486{
1487 int err;
bd238fb4 1488 struct p9_client *clnt;
51a87c55 1489 struct p9_req_t *req;
bd238fb4 1490
5d385153 1491 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
bd238fb4 1492 err = 0;
bd238fb4
LI
1493 clnt = fid->clnt;
1494
51a87c55
EVH
1495 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1496 if (IS_ERR(req)) {
1497 err = PTR_ERR(req);
1498 goto error;
bd238fb4
LI
1499 }
1500
5d385153 1501 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
bd238fb4 1502
51a87c55 1503 p9_free_req(clnt, req);
51a87c55 1504error:
208f3c28
JG
1505 if (err == -ERESTARTSYS)
1506 p9_client_clunk(fid);
1507 else
1508 p9_fid_destroy(fid);
bd238fb4
LI
1509 return err;
1510}
1511EXPORT_SYMBOL(p9_client_remove);
1512
48e370ff
AK
1513int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1514{
1515 int err = 0;
1516 struct p9_req_t *req;
1517 struct p9_client *clnt;
1518
5d385153 1519 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
48e370ff
AK
1520 dfid->fid, name, flags);
1521
1522 clnt = dfid->clnt;
1523 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1524 if (IS_ERR(req)) {
1525 err = PTR_ERR(req);
1526 goto error;
1527 }
5d385153 1528 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
48e370ff
AK
1529
1530 p9_free_req(clnt, req);
1531error:
1532 return err;
1533}
1534EXPORT_SYMBOL(p9_client_unlinkat);
1535
0fc9655e
EVH
1536int
1537p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1538 u32 count)
bd238fb4 1539{
51a87c55 1540 char *dataptr;
abfa034e
AK
1541 struct p9_req_t *req;
1542 struct p9_client *clnt;
1543 int err, rsize, non_zc = 0;
4f3b35c1
AV
1544 struct iov_iter to;
1545 union {
1546 struct kvec kv;
1547 struct iovec iov;
1548 } v;
1549
1550 if (data) {
1551 v.kv.iov_base = data;
1552 v.kv.iov_len = count;
1553 iov_iter_kvec(&to, ITER_KVEC | READ, &v.kv, 1, count);
1554 } else {
1555 v.iov.iov_base = udata;
1556 v.iov.iov_len = count;
1557 iov_iter_init(&to, READ, &v.iov, 1, count);
1558 }
bd238fb4 1559
5d385153 1560 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
95c96174 1561 fid->fid, (unsigned long long) offset, count);
bd238fb4 1562 err = 0;
bd238fb4 1563 clnt = fid->clnt;
bd238fb4
LI
1564
1565 rsize = fid->iounit;
1566 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1567 rsize = clnt->msize - P9_IOHDRSZ;
1568
51a87c55
EVH
1569 if (count < rsize)
1570 rsize = count;
bd238fb4 1571
aca00763 1572 /* Don't bother zerocopy for small IO (< 1024) */
abfa034e 1573 if (clnt->trans_mod->zc_request && rsize > 1024) {
abfa034e
AK
1574 /*
1575 * response header len is 11
1576 * PDU Header(7) + IO Size (4)
1577 */
4f3b35c1
AV
1578 req = p9_client_zc_rpc(clnt, P9_TREAD, &to, NULL, rsize, 0,
1579 11, "dqd", fid->fid,
abfa034e 1580 offset, rsize);
bb2f8a55 1581 } else {
abfa034e 1582 non_zc = 1;
bb2f8a55 1583 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
abfa034e 1584 rsize);
bb2f8a55 1585 }
51a87c55
EVH
1586 if (IS_ERR(req)) {
1587 err = PTR_ERR(req);
1588 goto error;
1589 }
bd238fb4 1590
342fee1d 1591 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
e7f4b8f1 1592 if (err) {
348b5901 1593 trace_9p_protocol_dump(clnt, req->rc);
51a87c55 1594 goto free_and_error;
e7f4b8f1 1595 }
bd238fb4 1596
5d385153 1597 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
bd238fb4 1598
4f3b35c1
AV
1599 if (non_zc && copy_to_iter(dataptr, count, &to) != count) {
1600 err = -EFAULT;
1601 goto free_and_error;
51a87c55 1602 }
51a87c55
EVH
1603 p9_free_req(clnt, req);
1604 return count;
bd238fb4 1605
51a87c55
EVH
1606free_and_error:
1607 p9_free_req(clnt, req);
bd238fb4 1608error:
bd238fb4
LI
1609 return err;
1610}
0fc9655e 1611EXPORT_SYMBOL(p9_client_read);
bd238fb4
LI
1612
1613int
070b3656 1614p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
bd238fb4 1615{
070b3656 1616 struct p9_client *clnt = fid->clnt;
51a87c55 1617 struct p9_req_t *req;
070b3656
AV
1618 int total = 0;
1619
1620 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1621 fid->fid, (unsigned long long) offset,
1622 iov_iter_count(from));
1623
1624 while (iov_iter_count(from)) {
1625 int count = iov_iter_count(from);
1626 int rsize = fid->iounit;
1627 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1628 rsize = clnt->msize - P9_IOHDRSZ;
1629
1630 if (count < rsize)
1631 rsize = count;
1632
1633 /* Don't bother zerocopy for small IO (< 1024) */
1634 if (clnt->trans_mod->zc_request && rsize > 1024) {
1635 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1636 rsize, P9_ZC_HDR_SZ, "dqd",
1637 fid->fid, offset, rsize);
1638 } else {
1639 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1640 offset, rsize, from);
1641 }
1642 if (IS_ERR(req)) {
1643 *err = PTR_ERR(req);
1644 break;
1645 }
bd238fb4 1646
070b3656
AV
1647 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1648 if (*err) {
1649 trace_9p_protocol_dump(clnt, req->rc);
1650 p9_free_req(clnt, req);
1651 }
1fc52481 1652
070b3656 1653 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
0fc9655e 1654
070b3656
AV
1655 p9_free_req(clnt, req);
1656 iov_iter_advance(from, count);
1657 total += count;
1658 offset += count;
e7f4b8f1 1659 }
070b3656 1660 return total;
bd238fb4 1661}
0fc9655e 1662EXPORT_SYMBOL(p9_client_write);
bd238fb4 1663
51a87c55 1664struct p9_wstat *p9_client_stat(struct p9_fid *fid)
5503ac56 1665{
51a87c55
EVH
1666 int err;
1667 struct p9_client *clnt;
1668 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1669 struct p9_req_t *req;
1670 u16 ignored;
5503ac56 1671
5d385153 1672 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
5503ac56 1673
5503ac56
EVH
1674 if (!ret)
1675 return ERR_PTR(-ENOMEM);
1676
bd238fb4 1677 err = 0;
bd238fb4
LI
1678 clnt = fid->clnt;
1679
51a87c55
EVH
1680 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1681 if (IS_ERR(req)) {
1682 err = PTR_ERR(req);
bd238fb4
LI
1683 goto error;
1684 }
1685
342fee1d 1686 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
e7f4b8f1 1687 if (err) {
348b5901 1688 trace_9p_protocol_dump(clnt, req->rc);
eedfe1c4
AK
1689 p9_free_req(clnt, req);
1690 goto error;
e7f4b8f1 1691 }
bd238fb4 1692
5d385153 1693 p9_debug(P9_DEBUG_9P,
e7f4b8f1
EVH
1694 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1695 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1696 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1697 "<<< uid=%d gid=%d n_muid=%d\n",
51a87c55 1698 ret->size, ret->type, ret->dev, ret->qid.type,
b0d5fdef
RD
1699 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1700 ret->atime, ret->mtime, (unsigned long long)ret->length,
1701 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
447c5094
EB
1702 from_kuid(&init_user_ns, ret->n_uid),
1703 from_kgid(&init_user_ns, ret->n_gid),
1704 from_kuid(&init_user_ns, ret->n_muid));
bd238fb4 1705
742b11a7
LI
1706 p9_free_req(clnt, req);
1707 return ret;
1708
bd238fb4 1709error:
742b11a7
LI
1710 kfree(ret);
1711 return ERR_PTR(err);
bd238fb4
LI
1712}
1713EXPORT_SYMBOL(p9_client_stat);
1714
f0853122
SK
1715struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1716 u64 request_mask)
1717{
1718 int err;
1719 struct p9_client *clnt;
1720 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1721 GFP_KERNEL);
1722 struct p9_req_t *req;
1723
5d385153 1724 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
f0853122
SK
1725 fid->fid, request_mask);
1726
1727 if (!ret)
1728 return ERR_PTR(-ENOMEM);
1729
1730 err = 0;
1731 clnt = fid->clnt;
1732
1733 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1734 if (IS_ERR(req)) {
1735 err = PTR_ERR(req);
1736 goto error;
1737 }
1738
1739 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1740 if (err) {
348b5901 1741 trace_9p_protocol_dump(clnt, req->rc);
f0853122
SK
1742 p9_free_req(clnt, req);
1743 goto error;
1744 }
1745
5d385153 1746 p9_debug(P9_DEBUG_9P,
f0853122
SK
1747 "<<< RGETATTR st_result_mask=%lld\n"
1748 "<<< qid=%x.%llx.%x\n"
1749 "<<< st_mode=%8.8x st_nlink=%llu\n"
1750 "<<< st_uid=%d st_gid=%d\n"
1751 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1752 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1753 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1754 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1755 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1756 "<<< st_gen=%lld st_data_version=%lld",
1757 ret->st_result_mask, ret->qid.type, ret->qid.path,
447c5094
EB
1758 ret->qid.version, ret->st_mode, ret->st_nlink,
1759 from_kuid(&init_user_ns, ret->st_uid),
1760 from_kgid(&init_user_ns, ret->st_gid),
1761 ret->st_rdev, ret->st_size, ret->st_blksize,
f0853122
SK
1762 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1763 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1764 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1765 ret->st_gen, ret->st_data_version);
1766
1767 p9_free_req(clnt, req);
1768 return ret;
1769
1770error:
1771 kfree(ret);
1772 return ERR_PTR(err);
1773}
1774EXPORT_SYMBOL(p9_client_getattr_dotl);
1775
342fee1d 1776static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
453ed90d
LI
1777{
1778 int ret;
1779
9d6939da 1780 /* NOTE: size shouldn't include its own length */
453ed90d
LI
1781 /* size[2] type[2] dev[4] qid[13] */
1782 /* mode[4] atime[4] mtime[4] length[8]*/
1783 /* name[s] uid[s] gid[s] muid[s] */
9d6939da 1784 ret = 2+4+13+4+4+4+8+2+2+2+2;
453ed90d
LI
1785
1786 if (wst->name)
1787 ret += strlen(wst->name);
1788 if (wst->uid)
1789 ret += strlen(wst->uid);
1790 if (wst->gid)
1791 ret += strlen(wst->gid);
1792 if (wst->muid)
1793 ret += strlen(wst->muid);
1794
c56e4acf
SK
1795 if ((proto_version == p9_proto_2000u) ||
1796 (proto_version == p9_proto_2000L)) {
453ed90d
LI
1797 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1798 if (wst->extension)
1799 ret += strlen(wst->extension);
1800 }
1801
1802 return ret;
1803}
1804
bd238fb4
LI
1805int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1806{
1807 int err;
51a87c55 1808 struct p9_req_t *req;
bd238fb4
LI
1809 struct p9_client *clnt;
1810
453ed90d
LI
1811 err = 0;
1812 clnt = fid->clnt;
342fee1d 1813 wst->size = p9_client_statsize(wst, clnt->proto_version);
5d385153
JP
1814 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1815 p9_debug(P9_DEBUG_9P,
e7f4b8f1
EVH
1816 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1817 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1818 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1819 " uid=%d gid=%d n_muid=%d\n",
1820 wst->size, wst->type, wst->dev, wst->qid.type,
b0d5fdef
RD
1821 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1822 wst->atime, wst->mtime, (unsigned long long)wst->length,
1823 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
447c5094
EB
1824 from_kuid(&init_user_ns, wst->n_uid),
1825 from_kgid(&init_user_ns, wst->n_gid),
1826 from_kuid(&init_user_ns, wst->n_muid));
bd238fb4 1827
9d6939da 1828 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
51a87c55
EVH
1829 if (IS_ERR(req)) {
1830 err = PTR_ERR(req);
1831 goto error;
bd238fb4
LI
1832 }
1833
5d385153 1834 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
bd238fb4 1835
51a87c55
EVH
1836 p9_free_req(clnt, req);
1837error:
bd238fb4
LI
1838 return err;
1839}
1840EXPORT_SYMBOL(p9_client_wstat);
bda8e775 1841
87d7845a
SK
1842int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1843{
1844 int err;
1845 struct p9_req_t *req;
1846 struct p9_client *clnt;
1847
1848 err = 0;
1849 clnt = fid->clnt;
5d385153
JP
1850 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1851 p9_debug(P9_DEBUG_9P,
87d7845a
SK
1852 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1853 " atime_sec=%lld atime_nsec=%lld\n"
1854 " mtime_sec=%lld mtime_nsec=%lld\n",
447c5094
EB
1855 p9attr->valid, p9attr->mode,
1856 from_kuid(&init_user_ns, p9attr->uid),
1857 from_kgid(&init_user_ns, p9attr->gid),
87d7845a
SK
1858 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1859 p9attr->mtime_sec, p9attr->mtime_nsec);
1860
1861 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1862
1863 if (IS_ERR(req)) {
1864 err = PTR_ERR(req);
1865 goto error;
1866 }
5d385153 1867 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
87d7845a
SK
1868 p9_free_req(clnt, req);
1869error:
1870 return err;
1871}
1872EXPORT_SYMBOL(p9_client_setattr);
1873
bda8e775
SK
1874int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1875{
1876 int err;
1877 struct p9_req_t *req;
1878 struct p9_client *clnt;
1879
1880 err = 0;
1881 clnt = fid->clnt;
1882
5d385153 1883 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
bda8e775
SK
1884
1885 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1886 if (IS_ERR(req)) {
1887 err = PTR_ERR(req);
1888 goto error;
1889 }
1890
1891 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1892 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1893 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1894 if (err) {
348b5901 1895 trace_9p_protocol_dump(clnt, req->rc);
bda8e775
SK
1896 p9_free_req(clnt, req);
1897 goto error;
1898 }
1899
5d385153 1900 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
bda8e775
SK
1901 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1902 "fsid %llu namelen %ld\n",
1903 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1904 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1905 sb->fsid, (long int)sb->namelen);
1906
1907 p9_free_req(clnt, req);
1908error:
1909 return err;
1910}
1911EXPORT_SYMBOL(p9_client_statfs);
4681dbda 1912
9e8fb38e
AK
1913int p9_client_rename(struct p9_fid *fid,
1914 struct p9_fid *newdirfid, const char *name)
4681dbda
SK
1915{
1916 int err;
1917 struct p9_req_t *req;
1918 struct p9_client *clnt;
1919
1920 err = 0;
1921 clnt = fid->clnt;
1922
5d385153 1923 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
4681dbda
SK
1924 fid->fid, newdirfid->fid, name);
1925
1926 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1927 newdirfid->fid, name);
1928 if (IS_ERR(req)) {
1929 err = PTR_ERR(req);
1930 goto error;
1931 }
1932
5d385153 1933 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
4681dbda
SK
1934
1935 p9_free_req(clnt, req);
1936error:
1937 return err;
1938}
1939EXPORT_SYMBOL(p9_client_rename);
1940
9e8fb38e
AK
1941int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1942 struct p9_fid *newdirfid, const char *new_name)
1943{
1944 int err;
1945 struct p9_req_t *req;
1946 struct p9_client *clnt;
1947
1948 err = 0;
1949 clnt = olddirfid->clnt;
1950
5d385153 1951 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
9e8fb38e
AK
1952 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1953 newdirfid->fid, new_name);
1954
1955 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1956 old_name, newdirfid->fid, new_name);
1957 if (IS_ERR(req)) {
1958 err = PTR_ERR(req);
1959 goto error;
1960 }
1961
5d385153 1962 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
9e8fb38e
AK
1963 newdirfid->fid, new_name);
1964
1965 p9_free_req(clnt, req);
1966error:
1967 return err;
1968}
1969EXPORT_SYMBOL(p9_client_renameat);
1970
0ef63f34
AK
1971/*
1972 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1973 */
1974struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1975 const char *attr_name, u64 *attr_size)
1976{
1977 int err;
1978 struct p9_req_t *req;
1979 struct p9_client *clnt;
1980 struct p9_fid *attr_fid;
1981
1982 err = 0;
1983 clnt = file_fid->clnt;
1984 attr_fid = p9_fid_create(clnt);
1985 if (IS_ERR(attr_fid)) {
1986 err = PTR_ERR(attr_fid);
1987 attr_fid = NULL;
1988 goto error;
1989 }
5d385153 1990 p9_debug(P9_DEBUG_9P,
0ef63f34
AK
1991 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1992 file_fid->fid, attr_fid->fid, attr_name);
1993
1994 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1995 file_fid->fid, attr_fid->fid, attr_name);
1996 if (IS_ERR(req)) {
1997 err = PTR_ERR(req);
1998 goto error;
1999 }
2000 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2001 if (err) {
348b5901 2002 trace_9p_protocol_dump(clnt, req->rc);
0ef63f34
AK
2003 p9_free_req(clnt, req);
2004 goto clunk_fid;
2005 }
2006 p9_free_req(clnt, req);
5d385153 2007 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
0ef63f34
AK
2008 attr_fid->fid, *attr_size);
2009 return attr_fid;
2010clunk_fid:
2011 p9_client_clunk(attr_fid);
2012 attr_fid = NULL;
2013error:
2014 if (attr_fid && (attr_fid != file_fid))
2015 p9_fid_destroy(attr_fid);
2016
2017 return ERR_PTR(err);
2018}
2019EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2020
eda25e46
AK
2021int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2022 u64 attr_size, int flags)
2023{
2024 int err;
2025 struct p9_req_t *req;
2026 struct p9_client *clnt;
2027
5d385153 2028 p9_debug(P9_DEBUG_9P,
eda25e46
AK
2029 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2030 fid->fid, name, (long long)attr_size, flags);
2031 err = 0;
2032 clnt = fid->clnt;
2033 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2034 fid->fid, name, attr_size, flags);
2035 if (IS_ERR(req)) {
2036 err = PTR_ERR(req);
2037 goto error;
2038 }
5d385153 2039 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
eda25e46
AK
2040 p9_free_req(clnt, req);
2041error:
2042 return err;
2043}
2044EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2045
7751bdb3
SK
2046int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2047{
abfa034e 2048 int err, rsize, non_zc = 0;
7751bdb3
SK
2049 struct p9_client *clnt;
2050 struct p9_req_t *req;
2051 char *dataptr;
4f3b35c1
AV
2052 struct kvec kv = {.iov_base = data, .iov_len = count};
2053 struct iov_iter to;
2054
2055 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
7751bdb3 2056
5d385153 2057 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
95c96174 2058 fid->fid, (unsigned long long) offset, count);
7751bdb3
SK
2059
2060 err = 0;
2061 clnt = fid->clnt;
7751bdb3
SK
2062
2063 rsize = fid->iounit;
2064 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2065 rsize = clnt->msize - P9_READDIRHDRSZ;
2066
2067 if (count < rsize)
2068 rsize = count;
2069
abfa034e
AK
2070 /* Don't bother zerocopy for small IO (< 1024) */
2071 if (clnt->trans_mod->zc_request && rsize > 1024) {
2072 /*
2073 * response header len is 11
2074 * PDU Header(7) + IO Size (4)
2075 */
4f3b35c1
AV
2076 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2077 11, "dqd", fid->fid, offset, rsize);
2c66523f 2078 } else {
abfa034e 2079 non_zc = 1;
2c66523f 2080 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
abfa034e 2081 offset, rsize);
2c66523f 2082 }
7751bdb3
SK
2083 if (IS_ERR(req)) {
2084 err = PTR_ERR(req);
2085 goto error;
2086 }
2087
2088 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2089 if (err) {
348b5901 2090 trace_9p_protocol_dump(clnt, req->rc);
7751bdb3
SK
2091 goto free_and_error;
2092 }
2093
5d385153 2094 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
7751bdb3 2095
abfa034e 2096 if (non_zc)
7751bdb3
SK
2097 memmove(data, dataptr, count);
2098
2099 p9_free_req(clnt, req);
2100 return count;
2101
2102free_and_error:
2103 p9_free_req(clnt, req);
2104error:
2105 return err;
2106}
2107EXPORT_SYMBOL(p9_client_readdir);
4b43516a
MK
2108
2109int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
f791f7c5 2110 dev_t rdev, kgid_t gid, struct p9_qid *qid)
4b43516a
MK
2111{
2112 int err;
2113 struct p9_client *clnt;
2114 struct p9_req_t *req;
2115
2116 err = 0;
2117 clnt = fid->clnt;
5d385153 2118 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
4b43516a 2119 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
f791f7c5 2120 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
4b43516a
MK
2121 MAJOR(rdev), MINOR(rdev), gid);
2122 if (IS_ERR(req))
2123 return PTR_ERR(req);
2124
2125 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2126 if (err) {
348b5901 2127 trace_9p_protocol_dump(clnt, req->rc);
4b43516a
MK
2128 goto error;
2129 }
5d385153 2130 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
4b43516a
MK
2131 (unsigned long long)qid->path, qid->version);
2132
2133error:
2134 p9_free_req(clnt, req);
2135 return err;
2136
2137}
2138EXPORT_SYMBOL(p9_client_mknod_dotl);
01a622bd
MK
2139
2140int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
f791f7c5 2141 kgid_t gid, struct p9_qid *qid)
01a622bd
MK
2142{
2143 int err;
2144 struct p9_client *clnt;
2145 struct p9_req_t *req;
2146
2147 err = 0;
2148 clnt = fid->clnt;
5d385153 2149 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
f791f7c5
EB
2150 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2151 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
01a622bd
MK
2152 gid);
2153 if (IS_ERR(req))
2154 return PTR_ERR(req);
2155
2156 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2157 if (err) {
348b5901 2158 trace_9p_protocol_dump(clnt, req->rc);
01a622bd
MK
2159 goto error;
2160 }
5d385153 2161 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
01a622bd
MK
2162 (unsigned long long)qid->path, qid->version);
2163
2164error:
2165 p9_free_req(clnt, req);
2166 return err;
2167
2168}
2169EXPORT_SYMBOL(p9_client_mkdir_dotl);
a099027c
MK
2170
2171int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2172{
2173 int err;
2174 struct p9_client *clnt;
2175 struct p9_req_t *req;
2176
2177 err = 0;
2178 clnt = fid->clnt;
5d385153 2179 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
a099027c
MK
2180 "start %lld length %lld proc_id %d client_id %s\n",
2181 fid->fid, flock->type, flock->flags, flock->start,
2182 flock->length, flock->proc_id, flock->client_id);
2183
2184 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2185 flock->flags, flock->start, flock->length,
2186 flock->proc_id, flock->client_id);
2187
2188 if (IS_ERR(req))
2189 return PTR_ERR(req);
2190
2191 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2192 if (err) {
348b5901 2193 trace_9p_protocol_dump(clnt, req->rc);
a099027c
MK
2194 goto error;
2195 }
5d385153 2196 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
a099027c
MK
2197error:
2198 p9_free_req(clnt, req);
2199 return err;
2200
2201}
2202EXPORT_SYMBOL(p9_client_lock_dotl);
1d769cd1
MK
2203
2204int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2205{
2206 int err;
2207 struct p9_client *clnt;
2208 struct p9_req_t *req;
2209
2210 err = 0;
2211 clnt = fid->clnt;
5d385153 2212 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
1d769cd1
MK
2213 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2214 glock->start, glock->length, glock->proc_id, glock->client_id);
2215
2216 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2217 glock->start, glock->length, glock->proc_id, glock->client_id);
2218
2219 if (IS_ERR(req))
2220 return PTR_ERR(req);
2221
2222 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2223 &glock->start, &glock->length, &glock->proc_id,
2224 &glock->client_id);
2225 if (err) {
348b5901 2226 trace_9p_protocol_dump(clnt, req->rc);
1d769cd1
MK
2227 goto error;
2228 }
5d385153 2229 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
1d769cd1
MK
2230 "proc_id %d client_id %s\n", glock->type, glock->start,
2231 glock->length, glock->proc_id, glock->client_id);
2232error:
2233 p9_free_req(clnt, req);
2234 return err;
2235}
2236EXPORT_SYMBOL(p9_client_getlock_dotl);
329176cc
MK
2237
2238int p9_client_readlink(struct p9_fid *fid, char **target)
2239{
2240 int err;
2241 struct p9_client *clnt;
2242 struct p9_req_t *req;
2243
2244 err = 0;
2245 clnt = fid->clnt;
5d385153 2246 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
329176cc
MK
2247
2248 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2249 if (IS_ERR(req))
2250 return PTR_ERR(req);
2251
2252 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2253 if (err) {
348b5901 2254 trace_9p_protocol_dump(clnt, req->rc);
329176cc
MK
2255 goto error;
2256 }
5d385153 2257 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
329176cc
MK
2258error:
2259 p9_free_req(clnt, req);
2260 return err;
2261}
2262EXPORT_SYMBOL(p9_client_readlink);