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