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   1 /*
   2  * net/9p/clnt.c
   3  *
   4  * 9P Client
   5  *
   6  *  Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
   7  *  Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2
  11  *  as published by the Free Software Foundation.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to:
  20  *  Free Software Foundation
  21  *  51 Franklin Street, Fifth Floor
  22  *  Boston, MA  02111-1301  USA
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/errno.h>
  28 #include <linux/fs.h>
  29 #include <linux/poll.h>
  30 #include <linux/idr.h>
  31 #include <linux/mutex.h>
  32 #include <linux/sched.h>
  33 #include <linux/uaccess.h>
  34 #include <net/9p/9p.h>
  35 #include <linux/parser.h>
  36 #include <net/9p/client.h>
  37 #include <net/9p/transport.h>
  38 #include "protocol.h"
  39
  40 /*
  41   * Client Option Parsing (code inspired by NFS code)
  42   *  - a little lazy - parse all client options
  43   */
  44
  45 enum {
  46         Opt_msize,
  47         Opt_trans,
  48         Opt_legacy,
  49         Opt_version,
  50         Opt_err,
  51 };
  52
  53 static const match_table_t tokens = {
  54         {Opt_msize, "msize=%u"},
  55         {Opt_legacy, "noextend"},
  56         {Opt_trans, "trans=%s"},
  57         {Opt_version, "version=%s"},
  58         {Opt_err, NULL},
  59 };
  60
  61 inline int p9_is_proto_dotl(struct p9_client *clnt)
  62 {
  63         return (clnt->proto_version == p9_proto_2000L);
  64 }
  65 EXPORT_SYMBOL(p9_is_proto_dotl);
  66
  67 inline int p9_is_proto_dotu(struct p9_client *clnt)
  68 {
  69         return (clnt->proto_version == p9_proto_2000u);
  70 }
  71 EXPORT_SYMBOL(p9_is_proto_dotu);
  72
  73 /* Interpret mount option for protocol version */
  74 static int get_protocol_version(const substring_t *name)
  75 {
  76         int version = -EINVAL;
  77
  78         if (!strncmp("9p2000", name->from, name->to-name->from)) {
  79                 version = p9_proto_legacy;
  80                 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
  81         } else if (!strncmp("9p2000.u", name->from, name->to-name->from)) {
  82                 version = p9_proto_2000u;
  83                 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
  84         } else if (!strncmp("9p2000.L", name->from, name->to-name->from)) {
  85                 version = p9_proto_2000L;
  86                 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
  87         } else {
  88                 P9_DPRINTK(P9_DEBUG_ERROR, "Unknown protocol version %s. ",
  89                                                         name->from);
  90         }
  91         return version;
  92 }
  93
  94 static struct p9_req_t *
  95 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
  96
  97 /**
  98  * parse_options - parse mount options into client structure
  99  * @opts: options string passed from mount
 100  * @clnt: existing v9fs client information
 101  *
 102  * Return 0 upon success, -ERRNO upon failure
 103  */
 104
 105 static int parse_opts(char *opts, struct p9_client *clnt)
 106 {
 107         char *options, *tmp_options;
 108         char *p;
 109         substring_t args[MAX_OPT_ARGS];
 110         int option;
 111         int ret = 0;
 112
 113         clnt->proto_version = p9_proto_2000u;
 114         clnt->msize = 8192;
 115
 116         if (!opts)
 117                 return 0;
 118
 119         tmp_options = kstrdup(opts, GFP_KERNEL);
 120         if (!tmp_options) {
 121                 P9_DPRINTK(P9_DEBUG_ERROR,
 122                                 "failed to allocate copy of option string\n");
 123                 return -ENOMEM;
 124         }
 125         options = tmp_options;
 126
 127         while ((p = strsep(&options, ",")) != NULL) {
 128                 int token;
 129                 if (!*p)
 130                         continue;
 131                 token = match_token(p, tokens, args);
 132                 if (token < Opt_trans) {
 133                         int r = match_int(&args[0], &option);
 134                         if (r < 0) {
 135                                 P9_DPRINTK(P9_DEBUG_ERROR,
 136                                         "integer field, but no integer?\n");
 137                                 ret = r;
 138                                 continue;
 139                         }
 140                 }
 141                 switch (token) {
 142                 case Opt_msize:
 143                         clnt->msize = option;
 144                         break;
 145                 case Opt_trans:
 146                         clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
 147                         if(clnt->trans_mod == NULL) {
 148                                 P9_DPRINTK(P9_DEBUG_ERROR,
 149                                    "Could not find request transport: %s\n",
 150                                    (char *) &args[0]);
 151                                 ret = -EINVAL;
 152                                 goto free_and_return;
 153                         }
 154                         break;
 155                 case Opt_legacy:
 156                         clnt->proto_version = p9_proto_legacy;
 157                         break;
 158                 case Opt_version:
 159                         ret = get_protocol_version(&args[0]);
 160                         if (ret == -EINVAL)
 161                                 goto free_and_return;
 162                         clnt->proto_version = ret;
 163                         break;
 164                 default:
 165                         continue;
 166                 }
 167         }
 168
 169 free_and_return:
 170         kfree(tmp_options);
 171         return ret;
 172 }
 173
 174 /**
 175  * p9_tag_alloc - lookup/allocate a request by tag
 176  * @c: client session to lookup tag within
 177  * @tag: numeric id for transaction
 178  *
 179  * this is a simple array lookup, but will grow the
 180  * request_slots as necessary to accomodate transaction
 181  * ids which did not previously have a slot.
 182  *
 183  * this code relies on the client spinlock to manage locks, its
 184  * possible we should switch to something else, but I'd rather
 185  * stick with something low-overhead for the common case.
 186  *
 187  */
 188
 189 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
 190 {
 191         unsigned long flags;
 192         int row, col;
 193         struct p9_req_t *req;
 194
 195         /* This looks up the original request by tag so we know which
 196          * buffer to read the data into */
 197         tag++;
 198
 199         if (tag >= c->max_tag) {
 200                 spin_lock_irqsave(&c->lock, flags);
 201                 /* check again since original check was outside of lock */
 202                 while (tag >= c->max_tag) {
 203                         row = (tag / P9_ROW_MAXTAG);
 204                         c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
 205                                         sizeof(struct p9_req_t), GFP_ATOMIC);
 206
 207                         if (!c->reqs[row]) {
 208                                 printk(KERN_ERR "Couldn't grow tag array\n");
 209                                 spin_unlock_irqrestore(&c->lock, flags);
 210                                 return ERR_PTR(-ENOMEM);
 211                         }
 212                         for (col = 0; col < P9_ROW_MAXTAG; col++) {
 213                                 c->reqs[row][col].status = REQ_STATUS_IDLE;
 214                                 c->reqs[row][col].tc = NULL;
 215                         }
 216                         c->max_tag += P9_ROW_MAXTAG;
 217                 }
 218                 spin_unlock_irqrestore(&c->lock, flags);
 219         }
 220         row = tag / P9_ROW_MAXTAG;
 221         col = tag % P9_ROW_MAXTAG;
 222
 223         req = &c->reqs[row][col];
 224         if (!req->tc) {
 225                 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
 226                 if (!req->wq) {
 227                         printk(KERN_ERR "Couldn't grow tag array\n");
 228                         return ERR_PTR(-ENOMEM);
 229                 }
 230                 init_waitqueue_head(req->wq);
 231                 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
 232                                                                 GFP_KERNEL);
 233                 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
 234                                                                 GFP_KERNEL);
 235                 if ((!req->tc) || (!req->rc)) {
 236                         printk(KERN_ERR "Couldn't grow tag array\n");
 237                         kfree(req->tc);
 238                         kfree(req->rc);
 239                         kfree(req->wq);
 240                         req->tc = req->rc = NULL;
 241                         req->wq = NULL;
 242                         return ERR_PTR(-ENOMEM);
 243                 }
 244                 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
 245                 req->tc->capacity = c->msize;
 246                 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
 247                 req->rc->capacity = c->msize;
 248         }
 249
 250         p9pdu_reset(req->tc);
 251         p9pdu_reset(req->rc);
 252
 253         req->tc->tag = tag-1;
 254         req->status = REQ_STATUS_ALLOC;
 255
 256         return &c->reqs[row][col];
 257 }
 258
 259 /**
 260  * p9_tag_lookup - lookup a request by tag
 261  * @c: client session to lookup tag within
 262  * @tag: numeric id for transaction
 263  *
 264  */
 265
 266 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
 267 {
 268         int row, col;
 269
 270         /* This looks up the original request by tag so we know which
 271          * buffer to read the data into */
 272         tag++;
 273
 274         BUG_ON(tag >= c->max_tag);
 275
 276         row = tag / P9_ROW_MAXTAG;
 277         col = tag % P9_ROW_MAXTAG;
 278
 279         return &c->reqs[row][col];
 280 }
 281 EXPORT_SYMBOL(p9_tag_lookup);
 282
 283 /**
 284  * p9_tag_init - setup tags structure and contents
 285  * @c:  v9fs client struct
 286  *
 287  * This initializes the tags structure for each client instance.
 288  *
 289  */
 290
 291 static int p9_tag_init(struct p9_client *c)
 292 {
 293         int err = 0;
 294
 295         c->tagpool = p9_idpool_create();
 296         if (IS_ERR(c->tagpool)) {
 297                 err = PTR_ERR(c->tagpool);
 298                 c->tagpool = NULL;
 299                 goto error;
 300         }
 301
 302         p9_idpool_get(c->tagpool); /* reserve tag 0 */
 303
 304         c->max_tag = 0;
 305 error:
 306         return err;
 307 }
 308
 309 /**
 310  * p9_tag_cleanup - cleans up tags structure and reclaims resources
 311  * @c:  v9fs client struct
 312  *
 313  * This frees resources associated with the tags structure
 314  *
 315  */
 316 static void p9_tag_cleanup(struct p9_client *c)
 317 {
 318         int row, col;
 319
 320         /* check to insure all requests are idle */
 321         for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
 322                 for (col = 0; col < P9_ROW_MAXTAG; col++) {
 323                         if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
 324                                 P9_DPRINTK(P9_DEBUG_MUX,
 325                                   "Attempting to cleanup non-free tag %d,%d\n",
 326                                   row, col);
 327                                 /* TODO: delay execution of cleanup */
 328                                 return;
 329                         }
 330                 }
 331         }
 332
 333         if (c->tagpool)
 334                 p9_idpool_destroy(c->tagpool);
 335
 336         /* free requests associated with tags */
 337         for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
 338                 for (col = 0; col < P9_ROW_MAXTAG; col++) {
 339                         kfree(c->reqs[row][col].wq);
 340                         kfree(c->reqs[row][col].tc);
 341                         kfree(c->reqs[row][col].rc);
 342                 }
 343                 kfree(c->reqs[row]);
 344         }
 345         c->max_tag = 0;
 346 }
 347
 348 /**
 349  * p9_free_req - free a request and clean-up as necessary
 350  * c: client state
 351  * r: request to release
 352  *
 353  */
 354
 355 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
 356 {
 357         int tag = r->tc->tag;
 358         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
 359
 360         r->status = REQ_STATUS_IDLE;
 361         if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
 362                 p9_idpool_put(tag, c->tagpool);
 363 }
 364
 365 /**
 366  * p9_client_cb - call back from transport to client
 367  * c: client state
 368  * req: request received
 369  *
 370  */
 371 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
 372 {
 373         P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
 374         wake_up(req->wq);
 375         P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
 376 }
 377 EXPORT_SYMBOL(p9_client_cb);
 378
 379 /**
 380  * p9_parse_header - parse header arguments out of a packet
 381  * @pdu: packet to parse
 382  * @size: size of packet
 383  * @type: type of request
 384  * @tag: tag of packet
 385  * @rewind: set if we need to rewind offset afterwards
 386  */
 387
 388 int
 389 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
 390                                                                 int rewind)
 391 {
 392         int8_t r_type;
 393         int16_t r_tag;
 394         int32_t r_size;
 395         int offset = pdu->offset;
 396         int err;
 397
 398         pdu->offset = 0;
 399         if (pdu->size == 0)
 400                 pdu->size = 7;
 401
 402         err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
 403         if (err)
 404                 goto rewind_and_exit;
 405
 406         pdu->size = r_size;
 407         pdu->id = r_type;
 408         pdu->tag = r_tag;
 409
 410         P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
 411                                                         pdu->id, pdu->tag);
 412
 413         if (type)
 414                 *type = r_type;
 415         if (tag)
 416                 *tag = r_tag;
 417         if (size)
 418                 *size = r_size;
 419
 420
 421 rewind_and_exit:
 422         if (rewind)
 423                 pdu->offset = offset;
 424         return err;
 425 }
 426 EXPORT_SYMBOL(p9_parse_header);
 427
 428 /**
 429  * p9_check_errors - check 9p packet for error return and process it
 430  * @c: current client instance
 431  * @req: request to parse and check for error conditions
 432  *
 433  * returns error code if one is discovered, otherwise returns 0
 434  *
 435  * this will have to be more complicated if we have multiple
 436  * error packet types
 437  */
 438
 439 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
 440 {
 441         int8_t type;
 442         int err;
 443
 444         err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
 445         if (err) {
 446                 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
 447                 return err;
 448         }
 449
 450         if (type == P9_RERROR) {
 451                 int ecode;
 452                 char *ename;
 453
 454                 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
 455                                                         &ename, &ecode);
 456                 if (err) {
 457                         P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
 458                                                                         err);
 459                         return err;
 460                 }
 461
 462                 if (p9_is_proto_dotu(c))
 463                         err = -ecode;
 464
 465                 if (!err || !IS_ERR_VALUE(err))
 466                         err = p9_errstr2errno(ename, strlen(ename));
 467
 468                 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
 469
 470                 kfree(ename);
 471         } else
 472                 err = 0;
 473
 474         return err;
 475 }
 476
 477 /**
 478  * p9_client_flush - flush (cancel) a request
 479  * @c: client state
 480  * @oldreq: request to cancel
 481  *
 482  * This sents a flush for a particular requests and links
 483  * the flush request to the original request.  The current
 484  * code only supports a single flush request although the protocol
 485  * allows for multiple flush requests to be sent for a single request.
 486  *
 487  */
 488
 489 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
 490 {
 491         struct p9_req_t *req;
 492         int16_t oldtag;
 493         int err;
 494
 495         err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
 496         if (err)
 497                 return err;
 498
 499         P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
 500
 501         req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
 502         if (IS_ERR(req))
 503                 return PTR_ERR(req);
 504
 505
 506         /* if we haven't received a response for oldreq,
 507            remove it from the list. */
 508         spin_lock(&c->lock);
 509         if (oldreq->status == REQ_STATUS_FLSH)
 510                 list_del(&oldreq->req_list);
 511         spin_unlock(&c->lock);
 512
 513         p9_free_req(c, req);
 514         return 0;
 515 }
 516
 517 /**
 518  * p9_client_rpc - issue a request and wait for a response
 519  * @c: client session
 520  * @type: type of request
 521  * @fmt: protocol format string (see protocol.c)
 522  *
 523  * Returns request structure (which client must free using p9_free_req)
 524  */
 525
 526 static struct p9_req_t *
 527 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
 528 {
 529         va_list ap;
 530         int tag, err;
 531         struct p9_req_t *req;
 532         unsigned long flags;
 533         int sigpending;
 534
 535         P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
 536
 537         /* we allow for any status other than disconnected */
 538         if (c->status == Disconnected)
 539                 return ERR_PTR(-EIO);
 540
 541         /* if status is begin_disconnected we allow only clunk request */
 542         if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
 543                 return ERR_PTR(-EIO);
 544
 545         if (signal_pending(current)) {
 546                 sigpending = 1;
 547                 clear_thread_flag(TIF_SIGPENDING);
 548         } else
 549                 sigpending = 0;
 550
 551         tag = P9_NOTAG;
 552         if (type != P9_TVERSION) {
 553                 tag = p9_idpool_get(c->tagpool);
 554                 if (tag < 0)
 555                         return ERR_PTR(-ENOMEM);
 556         }
 557
 558         req = p9_tag_alloc(c, tag);
 559         if (IS_ERR(req))
 560                 return req;
 561
 562         /* marshall the data */
 563         p9pdu_prepare(req->tc, tag, type);
 564         va_start(ap, fmt);
 565         err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
 566         va_end(ap);
 567         p9pdu_finalize(req->tc);
 568
 569         err = c->trans_mod->request(c, req);
 570         if (err < 0) {
 571                 c->status = Disconnected;
 572                 goto reterr;
 573         }
 574
 575         P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
 576         err = wait_event_interruptible(*req->wq,
 577                                                 req->status >= REQ_STATUS_RCVD);
 578         P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
 579                                                 req->wq, tag, err);
 580
 581         if (req->status == REQ_STATUS_ERROR) {
 582                 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
 583                 err = req->t_err;
 584         }
 585
 586         if ((err == -ERESTARTSYS) && (c->status == Connected)) {
 587                 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
 588                 sigpending = 1;
 589                 clear_thread_flag(TIF_SIGPENDING);
 590
 591                 if (c->trans_mod->cancel(c, req))
 592                         p9_client_flush(c, req);
 593
 594                 /* if we received the response anyway, don't signal error */
 595                 if (req->status == REQ_STATUS_RCVD)
 596                         err = 0;
 597         }
 598
 599         if (sigpending) {
 600                 spin_lock_irqsave(&current->sighand->siglock, flags);
 601                 recalc_sigpending();
 602                 spin_unlock_irqrestore(&current->sighand->siglock, flags);
 603         }
 604
 605         if (err < 0)
 606                 goto reterr;
 607
 608         err = p9_check_errors(c, req);
 609         if (!err) {
 610                 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
 611                 return req;
 612         }
 613
 614 reterr:
 615         P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
 616                                                                         err);
 617         p9_free_req(c, req);
 618         return ERR_PTR(err);
 619 }
 620
 621 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
 622 {
 623         int ret;
 624         struct p9_fid *fid;
 625         unsigned long flags;
 626
 627         P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
 628         fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
 629         if (!fid)
 630                 return ERR_PTR(-ENOMEM);
 631
 632         ret = p9_idpool_get(clnt->fidpool);
 633         if (ret < 0) {
 634                 ret = -ENOSPC;
 635                 goto error;
 636         }
 637         fid->fid = ret;
 638
 639         memset(&fid->qid, 0, sizeof(struct p9_qid));
 640         fid->mode = -1;
 641         fid->uid = current_fsuid();
 642         fid->clnt = clnt;
 643         fid->rdir = NULL;
 644         spin_lock_irqsave(&clnt->lock, flags);
 645         list_add(&fid->flist, &clnt->fidlist);
 646         spin_unlock_irqrestore(&clnt->lock, flags);
 647
 648         return fid;
 649
 650 error:
 651         kfree(fid);
 652         return ERR_PTR(ret);
 653 }
 654
 655 static void p9_fid_destroy(struct p9_fid *fid)
 656 {
 657         struct p9_client *clnt;
 658         unsigned long flags;
 659
 660         P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
 661         clnt = fid->clnt;
 662         p9_idpool_put(fid->fid, clnt->fidpool);
 663         spin_lock_irqsave(&clnt->lock, flags);
 664         list_del(&fid->flist);
 665         spin_unlock_irqrestore(&clnt->lock, flags);
 666         kfree(fid->rdir);
 667         kfree(fid);
 668 }
 669
 670 int p9_client_version(struct p9_client *c)
 671 {
 672         int err = 0;
 673         struct p9_req_t *req;
 674         char *version;
 675         int msize;
 676
 677         P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
 678                                                 c->msize, c->proto_version);
 679
 680         switch (c->proto_version) {
 681         case p9_proto_2000L:
 682                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 683                                         c->msize, "9P2000.L");
 684                 break;
 685         case p9_proto_2000u:
 686                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 687                                         c->msize, "9P2000.u");
 688                 break;
 689         case p9_proto_legacy:
 690                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 691                                         c->msize, "9P2000");
 692                 break;
 693         default:
 694                 return -EINVAL;
 695                 break;
 696         }
 697
 698         if (IS_ERR(req))
 699                 return PTR_ERR(req);
 700
 701         err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
 702         if (err) {
 703                 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
 704                 p9pdu_dump(1, req->rc);
 705                 goto error;
 706         }
 707
 708         P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
 709         if (!strncmp(version, "9P2000.L", 8))
 710                 c->proto_version = p9_proto_2000L;
 711         else if (!strncmp(version, "9P2000.u", 8))
 712                 c->proto_version = p9_proto_2000u;
 713         else if (!strncmp(version, "9P2000", 6))
 714                 c->proto_version = p9_proto_legacy;
 715         else {
 716                 err = -EREMOTEIO;
 717                 goto error;
 718         }
 719
 720         if (msize < c->msize)
 721                 c->msize = msize;
 722
 723 error:
 724         kfree(version);
 725         p9_free_req(c, req);
 726
 727         return err;
 728 }
 729 EXPORT_SYMBOL(p9_client_version);
 730
 731 struct p9_client *p9_client_create(const char *dev_name, char *options)
 732 {
 733         int err;
 734         struct p9_client *clnt;
 735
 736         err = 0;
 737         clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
 738         if (!clnt)
 739                 return ERR_PTR(-ENOMEM);
 740
 741         clnt->trans_mod = NULL;
 742         clnt->trans = NULL;
 743         spin_lock_init(&clnt->lock);
 744         INIT_LIST_HEAD(&clnt->fidlist);
 745
 746         p9_tag_init(clnt);
 747
 748         err = parse_opts(options, clnt);
 749         if (err < 0)
 750                 goto free_client;
 751
 752         if (!clnt->trans_mod)
 753                 clnt->trans_mod = v9fs_get_default_trans();
 754
 755         if (clnt->trans_mod == NULL) {
 756                 err = -EPROTONOSUPPORT;
 757                 P9_DPRINTK(P9_DEBUG_ERROR,
 758                                 "No transport defined or default transport\n");
 759                 goto free_client;
 760         }
 761
 762         clnt->fidpool = p9_idpool_create();
 763         if (IS_ERR(clnt->fidpool)) {
 764                 err = PTR_ERR(clnt->fidpool);
 765                 clnt->fidpool = NULL;
 766                 goto put_trans;
 767         }
 768
 769         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
 770                 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
 771
 772         err = clnt->trans_mod->create(clnt, dev_name, options);
 773         if (err)
 774                 goto destroy_fidpool;
 775
 776         if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
 777                 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
 778
 779         err = p9_client_version(clnt);
 780         if (err)
 781                 goto close_trans;
 782
 783         return clnt;
 784
 785 close_trans:
 786         clnt->trans_mod->close(clnt);
 787 destroy_fidpool:
 788         p9_idpool_destroy(clnt->fidpool);
 789 put_trans:
 790         v9fs_put_trans(clnt->trans_mod);
 791 free_client:
 792         kfree(clnt);
 793         return ERR_PTR(err);
 794 }
 795 EXPORT_SYMBOL(p9_client_create);
 796
 797 void p9_client_destroy(struct p9_client *clnt)
 798 {
 799         struct p9_fid *fid, *fidptr;
 800
 801         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
 802
 803         if (clnt->trans_mod)
 804                 clnt->trans_mod->close(clnt);
 805
 806         v9fs_put_trans(clnt->trans_mod);
 807
 808         list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
 809                 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
 810                 p9_fid_destroy(fid);
 811         }
 812
 813         if (clnt->fidpool)
 814                 p9_idpool_destroy(clnt->fidpool);
 815
 816         p9_tag_cleanup(clnt);
 817
 818         kfree(clnt);
 819 }
 820 EXPORT_SYMBOL(p9_client_destroy);
 821
 822 void p9_client_disconnect(struct p9_client *clnt)
 823 {
 824         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
 825         clnt->status = Disconnected;
 826 }
 827 EXPORT_SYMBOL(p9_client_disconnect);
 828
 829 void p9_client_begin_disconnect(struct p9_client *clnt)
 830 {
 831         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
 832         clnt->status = BeginDisconnect;
 833 }
 834 EXPORT_SYMBOL(p9_client_begin_disconnect);
 835
 836 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
 837         char *uname, u32 n_uname, char *aname)
 838 {
 839         int err;
 840         struct p9_req_t *req;
 841         struct p9_fid *fid;
 842         struct p9_qid qid;
 843
 844         P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
 845                                         afid ? afid->fid : -1, uname, aname);
 846         err = 0;
 847
 848         fid = p9_fid_create(clnt);
 849         if (IS_ERR(fid)) {
 850                 err = PTR_ERR(fid);
 851                 fid = NULL;
 852                 goto error;
 853         }
 854
 855         req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
 856                         afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
 857         if (IS_ERR(req)) {
 858                 err = PTR_ERR(req);
 859                 goto error;
 860         }
 861
 862         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
 863         if (err) {
 864                 p9pdu_dump(1, req->rc);
 865                 p9_free_req(clnt, req);
 866                 goto error;
 867         }
 868
 869         P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
 870                                         qid.type,
 871                                         (unsigned long long)qid.path,
 872                                         qid.version);
 873
 874         memmove(&fid->qid, &qid, sizeof(struct p9_qid));
 875
 876         p9_free_req(clnt, req);
 877         return fid;
 878
 879 error:
 880         if (fid)
 881                 p9_fid_destroy(fid);
 882         return ERR_PTR(err);
 883 }
 884 EXPORT_SYMBOL(p9_client_attach);
 885
 886 struct p9_fid *
 887 p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
 888 {
 889         int err;
 890         struct p9_req_t *req;
 891         struct p9_qid qid;
 892         struct p9_fid *afid;
 893
 894         P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
 895         err = 0;
 896
 897         afid = p9_fid_create(clnt);
 898         if (IS_ERR(afid)) {
 899                 err = PTR_ERR(afid);
 900                 afid = NULL;
 901                 goto error;
 902         }
 903
 904         req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
 905                         afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
 906         if (IS_ERR(req)) {
 907                 err = PTR_ERR(req);
 908                 goto error;
 909         }
 910
 911         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
 912         if (err) {
 913                 p9pdu_dump(1, req->rc);
 914                 p9_free_req(clnt, req);
 915                 goto error;
 916         }
 917
 918         P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n",
 919                                         qid.type,
 920                                         (unsigned long long)qid.path,
 921                                         qid.version);
 922
 923         memmove(&afid->qid, &qid, sizeof(struct p9_qid));
 924         p9_free_req(clnt, req);
 925         return afid;
 926
 927 error:
 928         if (afid)
 929                 p9_fid_destroy(afid);
 930         return ERR_PTR(err);
 931 }
 932 EXPORT_SYMBOL(p9_client_auth);
 933
 934 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
 935         int clone)
 936 {
 937         int err;
 938         struct p9_client *clnt;
 939         struct p9_fid *fid;
 940         struct p9_qid *wqids;
 941         struct p9_req_t *req;
 942         int16_t nwqids, count;
 943
 944         err = 0;
 945         clnt = oldfid->clnt;
 946         if (clone) {
 947                 fid = p9_fid_create(clnt);
 948                 if (IS_ERR(fid)) {
 949                         err = PTR_ERR(fid);
 950                         fid = NULL;
 951                         goto error;
 952                 }
 953
 954                 fid->uid = oldfid->uid;
 955         } else
 956                 fid = oldfid;
 957
 958
 959         P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
 960                 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
 961
 962         req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
 963                                                                 nwname, wnames);
 964         if (IS_ERR(req)) {
 965                 err = PTR_ERR(req);
 966                 goto error;
 967         }
 968
 969         err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
 970         if (err) {
 971                 p9pdu_dump(1, req->rc);
 972                 p9_free_req(clnt, req);
 973                 goto clunk_fid;
 974         }
 975         p9_free_req(clnt, req);
 976
 977         P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
 978
 979         if (nwqids != nwname) {
 980                 err = -ENOENT;
 981                 goto clunk_fid;
 982         }
 983
 984         for (count = 0; count < nwqids; count++)
 985                 P9_DPRINTK(P9_DEBUG_9P, "<<<     [%d] %x.%llx.%x\n",
 986                         count, wqids[count].type,
 987                         (unsigned long long)wqids[count].path,
 988                         wqids[count].version);
 989
 990         if (nwname)
 991                 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
 992         else
 993                 fid->qid = oldfid->qid;
 994
 995         return fid;
 996
 997 clunk_fid:
 998         p9_client_clunk(fid);
 999         fid = NULL;
1000
1001 error:
1002         if (fid && (fid != oldfid))
1003                 p9_fid_destroy(fid);
1004
1005         return ERR_PTR(err);
1006 }
1007 EXPORT_SYMBOL(p9_client_walk);
1008
1009 int p9_client_open(struct p9_fid *fid, int mode)
1010 {
1011         int err;
1012         struct p9_client *clnt;
1013         struct p9_req_t *req;
1014         struct p9_qid qid;
1015         int iounit;
1016
1017         P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode);
1018         err = 0;
1019         clnt = fid->clnt;
1020
1021         if (fid->mode != -1)
1022                 return -EINVAL;
1023
1024         req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1025         if (IS_ERR(req)) {
1026                 err = PTR_ERR(req);
1027                 goto error;
1028         }
1029
1030         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1031         if (err) {
1032                 p9pdu_dump(1, req->rc);
1033                 goto free_and_error;
1034         }
1035
1036         P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n",
1037                                 qid.type,
1038                                 (unsigned long long)qid.path,
1039                                 qid.version, iounit);
1040
1041         fid->mode = mode;
1042         fid->iounit = iounit;
1043
1044 free_and_error:
1045         p9_free_req(clnt, req);
1046 error:
1047         return err;
1048 }
1049 EXPORT_SYMBOL(p9_client_open);
1050
1051 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1052                      char *extension)
1053 {
1054         int err;
1055         struct p9_client *clnt;
1056         struct p9_req_t *req;
1057         struct p9_qid qid;
1058         int iounit;
1059
1060         P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1061                                                 fid->fid, name, perm, mode);
1062         err = 0;
1063         clnt = fid->clnt;
1064
1065         if (fid->mode != -1)
1066                 return -EINVAL;
1067
1068         req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1069                                 mode, extension);
1070         if (IS_ERR(req)) {
1071                 err = PTR_ERR(req);
1072                 goto error;
1073         }
1074
1075         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1076         if (err) {
1077                 p9pdu_dump(1, req->rc);
1078                 goto free_and_error;
1079         }
1080
1081         P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1082                                 qid.type,
1083                                 (unsigned long long)qid.path,
1084                                 qid.version, iounit);
1085
1086         fid->mode = mode;
1087         fid->iounit = iounit;
1088
1089 free_and_error:
1090         p9_free_req(clnt, req);
1091 error:
1092         return err;
1093 }
1094 EXPORT_SYMBOL(p9_client_fcreate);
1095
1096 int p9_client_clunk(struct p9_fid *fid)
1097 {
1098         int err;
1099         struct p9_client *clnt;
1100         struct p9_req_t *req;
1101
1102         P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1103         err = 0;
1104         clnt = fid->clnt;
1105
1106         req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1107         if (IS_ERR(req)) {
1108                 err = PTR_ERR(req);
1109                 goto error;
1110         }
1111
1112         P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1113
1114         p9_free_req(clnt, req);
1115         p9_fid_destroy(fid);
1116
1117 error:
1118         return err;
1119 }
1120 EXPORT_SYMBOL(p9_client_clunk);
1121
1122 int p9_client_remove(struct p9_fid *fid)
1123 {
1124         int err;
1125         struct p9_client *clnt;
1126         struct p9_req_t *req;
1127
1128         P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1129         err = 0;
1130         clnt = fid->clnt;
1131
1132         req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1133         if (IS_ERR(req)) {
1134                 err = PTR_ERR(req);
1135                 goto error;
1136         }
1137
1138         P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1139
1140         p9_free_req(clnt, req);
1141         p9_fid_destroy(fid);
1142
1143 error:
1144         return err;
1145 }
1146 EXPORT_SYMBOL(p9_client_remove);
1147
1148 int
1149 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1150                                                                 u32 count)
1151 {
1152         int err, rsize, total;
1153         struct p9_client *clnt;
1154         struct p9_req_t *req;
1155         char *dataptr;
1156
1157         P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1158                                         (long long unsigned) offset, count);
1159         err = 0;
1160         clnt = fid->clnt;
1161         total = 0;
1162
1163         rsize = fid->iounit;
1164         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1165                 rsize = clnt->msize - P9_IOHDRSZ;
1166
1167         if (count < rsize)
1168                 rsize = count;
1169
1170         req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1171         if (IS_ERR(req)) {
1172                 err = PTR_ERR(req);
1173                 goto error;
1174         }
1175
1176         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1177         if (err) {
1178                 p9pdu_dump(1, req->rc);
1179                 goto free_and_error;
1180         }
1181
1182         P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1183
1184         if (data) {
1185                 memmove(data, dataptr, count);
1186         }
1187
1188         if (udata) {
1189                 err = copy_to_user(udata, dataptr, count);
1190                 if (err) {
1191                         err = -EFAULT;
1192                         goto free_and_error;
1193                 }
1194         }
1195
1196         p9_free_req(clnt, req);
1197         return count;
1198
1199 free_and_error:
1200         p9_free_req(clnt, req);
1201 error:
1202         return err;
1203 }
1204 EXPORT_SYMBOL(p9_client_read);
1205
1206 int
1207 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1208                                                         u64 offset, u32 count)
1209 {
1210         int err, rsize, total;
1211         struct p9_client *clnt;
1212         struct p9_req_t *req;
1213
1214         P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1215                                 fid->fid, (long long unsigned) offset, count);
1216         err = 0;
1217         clnt = fid->clnt;
1218         total = 0;
1219
1220         rsize = fid->iounit;
1221         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1222                 rsize = clnt->msize - P9_IOHDRSZ;
1223
1224         if (count < rsize)
1225                 rsize = count;
1226         if (data)
1227                 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1228                                                                 rsize, data);
1229         else
1230                 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1231                                                                 rsize, udata);
1232         if (IS_ERR(req)) {
1233                 err = PTR_ERR(req);
1234                 goto error;
1235         }
1236
1237         err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1238         if (err) {
1239                 p9pdu_dump(1, req->rc);
1240                 goto free_and_error;
1241         }
1242
1243         P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1244
1245         p9_free_req(clnt, req);
1246         return count;
1247
1248 free_and_error:
1249         p9_free_req(clnt, req);
1250 error:
1251         return err;
1252 }
1253 EXPORT_SYMBOL(p9_client_write);
1254
1255 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1256 {
1257         int err;
1258         struct p9_client *clnt;
1259         struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1260         struct p9_req_t *req;
1261         u16 ignored;
1262
1263         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1264
1265         if (!ret)
1266                 return ERR_PTR(-ENOMEM);
1267
1268         err = 0;
1269         clnt = fid->clnt;
1270
1271         req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1272         if (IS_ERR(req)) {
1273                 err = PTR_ERR(req);
1274                 goto error;
1275         }
1276
1277         err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1278         if (err) {
1279                 p9pdu_dump(1, req->rc);
1280                 p9_free_req(clnt, req);
1281                 goto error;
1282         }
1283
1284         P9_DPRINTK(P9_DEBUG_9P,
1285                 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1286                 "<<<    mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1287                 "<<<    name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1288                 "<<<    uid=%d gid=%d n_muid=%d\n",
1289                 ret->size, ret->type, ret->dev, ret->qid.type,
1290                 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1291                 ret->atime, ret->mtime, (unsigned long long)ret->length,
1292                 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1293                 ret->n_uid, ret->n_gid, ret->n_muid);
1294
1295         p9_free_req(clnt, req);
1296         return ret;
1297
1298 error:
1299         kfree(ret);
1300         return ERR_PTR(err);
1301 }
1302 EXPORT_SYMBOL(p9_client_stat);
1303
1304 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1305 {
1306         int ret;
1307
1308         /* NOTE: size shouldn't include its own length */
1309         /* size[2] type[2] dev[4] qid[13] */
1310         /* mode[4] atime[4] mtime[4] length[8]*/
1311         /* name[s] uid[s] gid[s] muid[s] */
1312         ret = 2+4+13+4+4+4+8+2+2+2+2;
1313
1314         if (wst->name)
1315                 ret += strlen(wst->name);
1316         if (wst->uid)
1317                 ret += strlen(wst->uid);
1318         if (wst->gid)
1319                 ret += strlen(wst->gid);
1320         if (wst->muid)
1321                 ret += strlen(wst->muid);
1322
1323         if (proto_version == p9_proto_2000u) {
1324                 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1325                 if (wst->extension)
1326                         ret += strlen(wst->extension);
1327         }
1328
1329         return ret;
1330 }
1331
1332 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1333 {
1334         int err;
1335         struct p9_req_t *req;
1336         struct p9_client *clnt;
1337
1338         err = 0;
1339         clnt = fid->clnt;
1340         wst->size = p9_client_statsize(wst, clnt->proto_version);
1341         P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1342         P9_DPRINTK(P9_DEBUG_9P,
1343                 "     sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1344                 "     mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1345                 "     name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1346                 "     uid=%d gid=%d n_muid=%d\n",
1347                 wst->size, wst->type, wst->dev, wst->qid.type,
1348                 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1349                 wst->atime, wst->mtime, (unsigned long long)wst->length,
1350                 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1351                 wst->n_uid, wst->n_gid, wst->n_muid);
1352
1353         req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1354         if (IS_ERR(req)) {
1355                 err = PTR_ERR(req);
1356                 goto error;
1357         }
1358
1359         P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1360
1361         p9_free_req(clnt, req);
1362 error:
1363         return err;
1364 }
1365 EXPORT_SYMBOL(p9_client_wstat);