net/9p/client.c

   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/slab.h>
  33 #include <linux/sched.h>
  34 #include <linux/uaccess.h>
  35 #include <net/9p/9p.h>
  36 #include <linux/parser.h>
  37 #include <net/9p/client.h>
  38 #include <net/9p/transport.h>
  39 #include "protocol.h"
  40
  41 #define CREATE_TRACE_POINTS
  42 #include <trace/events/9p.h>
  43
  44 /*
  45   * Client Option Parsing (code inspired by NFS code)
  46   *  - a little lazy - parse all client options
  47   */
  48
  49 enum {
  50         Opt_msize,
  51         Opt_trans,
  52         Opt_legacy,
  53         Opt_version,
  54         Opt_err,
  55 };
  56
  57 static const match_table_t tokens = {
  58         {Opt_msize, "msize=%u"},
  59         {Opt_legacy, "noextend"},
  60         {Opt_trans, "trans=%s"},
  61         {Opt_version, "version=%s"},
  62         {Opt_err, NULL},
  63 };
  64
  65 inline int p9_is_proto_dotl(struct p9_client *clnt)
  66 {
  67         return clnt->proto_version == p9_proto_2000L;
  68 }
  69 EXPORT_SYMBOL(p9_is_proto_dotl);
  70
  71 inline int p9_is_proto_dotu(struct p9_client *clnt)
  72 {
  73         return clnt->proto_version == p9_proto_2000u;
  74 }
  75 EXPORT_SYMBOL(p9_is_proto_dotu);
  76
  77 /* Interpret mount option for protocol version */
  78 static int get_protocol_version(char *s)
  79 {
  80         int version = -EINVAL;
  81
  82         if (!strcmp(s, "9p2000")) {
  83                 version = p9_proto_legacy;
  84                 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
  85         } else if (!strcmp(s, "9p2000.u")) {
  86                 version = p9_proto_2000u;
  87                 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
  88         } else if (!strcmp(s, "9p2000.L")) {
  89                 version = p9_proto_2000L;
  90                 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
  91         } else
  92                 printk(KERN_INFO "9p: Unknown protocol version %s.\n", s);
  93
  94         return version;
  95 }
  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         char *s;
 112         int ret = 0;
 113
 114         clnt->proto_version = p9_proto_2000u;
 115         clnt->msize = 8192;
 116
 117         if (!opts)
 118                 return 0;
 119
 120         tmp_options = kstrdup(opts, GFP_KERNEL);
 121         if (!tmp_options) {
 122                 P9_DPRINTK(P9_DEBUG_ERROR,
 123                                 "failed to allocate copy of option string\n");
 124                 return -ENOMEM;
 125         }
 126         options = tmp_options;
 127
 128         while ((p = strsep(&options, ",")) != NULL) {
 129                 int token, r;
 130                 if (!*p)
 131                         continue;
 132                 token = match_token(p, tokens, args);
 133                 switch (token) {
 134                 case Opt_msize:
 135                         r = match_int(&args[0], &option);
 136                         if (r < 0) {
 137                                 P9_DPRINTK(P9_DEBUG_ERROR,
 138                                            "integer field, but no integer?\n");
 139                                 ret = r;
 140                                 continue;
 141                         }
 142                         clnt->msize = option;
 143                         break;
 144                 case Opt_trans:
 145                         s = match_strdup(&args[0]);
 146                         if (!s) {
 147                                 ret = -ENOMEM;
 148                                 P9_DPRINTK(P9_DEBUG_ERROR,
 149                                         "problem allocating copy of trans arg\n");
 150                                 goto free_and_return;
 151                          }
 152                         clnt->trans_mod = v9fs_get_trans_by_name(s);
 153                         if (clnt->trans_mod == NULL) {
 154                                 printk(KERN_INFO
 155                                         "9p: Could not find "
 156                                         "request transport: %s\n", s);
 157                                 ret = -EINVAL;
 158                                 kfree(s);
 159                                 goto free_and_return;
 160                         }
 161                         kfree(s);
 162                         break;
 163                 case Opt_legacy:
 164                         clnt->proto_version = p9_proto_legacy;
 165                         break;
 166                 case Opt_version:
 167                         s = match_strdup(&args[0]);
 168                         if (!s) {
 169                                 ret = -ENOMEM;
 170                                 P9_DPRINTK(P9_DEBUG_ERROR,
 171                                         "problem allocating copy of version arg\n");
 172                                 goto free_and_return;
 173                         }
 174                         ret = get_protocol_version(s);
 175                         if (ret == -EINVAL) {
 176                                 kfree(s);
 177                                 goto free_and_return;
 178                         }
 179                         kfree(s);
 180                         clnt->proto_version = ret;
 181                         break;
 182                 default:
 183                         continue;
 184                 }
 185         }
 186
 187 free_and_return:
 188         kfree(tmp_options);
 189         return ret;
 190 }
 191
 192 /**
 193  * p9_tag_alloc - lookup/allocate a request by tag
 194  * @c: client session to lookup tag within
 195  * @tag: numeric id for transaction
 196  *
 197  * this is a simple array lookup, but will grow the
 198  * request_slots as necessary to accommodate transaction
 199  * ids which did not previously have a slot.
 200  *
 201  * this code relies on the client spinlock to manage locks, its
 202  * possible we should switch to something else, but I'd rather
 203  * stick with something low-overhead for the common case.
 204  *
 205  */
 206
 207 static struct p9_req_t *
 208 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
 209 {
 210         unsigned long flags;
 211         int row, col;
 212         struct p9_req_t *req;
 213         int alloc_msize = min(c->msize, max_size);
 214
 215         /* This looks up the original request by tag so we know which
 216          * buffer to read the data into */
 217         tag++;
 218
 219         if (tag >= c->max_tag) {
 220                 spin_lock_irqsave(&c->lock, flags);
 221                 /* check again since original check was outside of lock */
 222                 while (tag >= c->max_tag) {
 223                         row = (tag / P9_ROW_MAXTAG);
 224                         c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
 225                                         sizeof(struct p9_req_t), GFP_ATOMIC);
 226
 227                         if (!c->reqs[row]) {
 228                                 printk(KERN_ERR "Couldn't grow tag array\n");
 229                                 spin_unlock_irqrestore(&c->lock, flags);
 230                                 return ERR_PTR(-ENOMEM);
 231                         }
 232                         for (col = 0; col < P9_ROW_MAXTAG; col++) {
 233                                 c->reqs[row][col].status = REQ_STATUS_IDLE;
 234                                 c->reqs[row][col].tc = NULL;
 235                         }
 236                         c->max_tag += P9_ROW_MAXTAG;
 237                 }
 238                 spin_unlock_irqrestore(&c->lock, flags);
 239         }
 240         row = tag / P9_ROW_MAXTAG;
 241         col = tag % P9_ROW_MAXTAG;
 242
 243         req = &c->reqs[row][col];
 244         if (!req->tc) {
 245                 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
 246                 if (!req->wq) {
 247                         printk(KERN_ERR "Couldn't grow tag array\n");
 248                         return ERR_PTR(-ENOMEM);
 249                 }
 250                 init_waitqueue_head(req->wq);
 251                 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
 252                                   GFP_NOFS);
 253                 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
 254                                   GFP_NOFS);
 255                 if ((!req->tc) || (!req->rc)) {
 256                         printk(KERN_ERR "Couldn't grow tag array\n");
 257                         kfree(req->tc);
 258                         kfree(req->rc);
 259                         kfree(req->wq);
 260                         req->tc = req->rc = NULL;
 261                         req->wq = NULL;
 262                         return ERR_PTR(-ENOMEM);
 263                 }
 264                 req->tc->capacity = alloc_msize;
 265                 req->rc->capacity = alloc_msize;
 266                 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
 267                 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
 268         }
 269
 270         p9pdu_reset(req->tc);
 271         p9pdu_reset(req->rc);
 272
 273         req->tc->tag = tag-1;
 274         req->status = REQ_STATUS_ALLOC;
 275
 276         return &c->reqs[row][col];
 277 }
 278
 279 /**
 280  * p9_tag_lookup - lookup a request by tag
 281  * @c: client session to lookup tag within
 282  * @tag: numeric id for transaction
 283  *
 284  */
 285
 286 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
 287 {
 288         int row, col;
 289
 290         /* This looks up the original request by tag so we know which
 291          * buffer to read the data into */
 292         tag++;
 293
 294         if(tag >= c->max_tag)
 295                 return NULL;
 296
 297         row = tag / P9_ROW_MAXTAG;
 298         col = tag % P9_ROW_MAXTAG;
 299
 300         return &c->reqs[row][col];
 301 }
 302 EXPORT_SYMBOL(p9_tag_lookup);
 303
 304 /**
 305  * p9_tag_init - setup tags structure and contents
 306  * @c:  v9fs client struct
 307  *
 308  * This initializes the tags structure for each client instance.
 309  *
 310  */
 311
 312 static int p9_tag_init(struct p9_client *c)
 313 {
 314         int err = 0;
 315
 316         c->tagpool = p9_idpool_create();
 317         if (IS_ERR(c->tagpool)) {
 318                 err = PTR_ERR(c->tagpool);
 319                 goto error;
 320         }
 321         err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
 322         if (err < 0) {
 323                 p9_idpool_destroy(c->tagpool);
 324                 goto error;
 325         }
 326         c->max_tag = 0;
 327 error:
 328         return err;
 329 }
 330
 331 /**
 332  * p9_tag_cleanup - cleans up tags structure and reclaims resources
 333  * @c:  v9fs client struct
 334  *
 335  * This frees resources associated with the tags structure
 336  *
 337  */
 338 static void p9_tag_cleanup(struct p9_client *c)
 339 {
 340         int row, col;
 341
 342         /* check to insure all requests are idle */
 343         for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
 344                 for (col = 0; col < P9_ROW_MAXTAG; col++) {
 345                         if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
 346                                 P9_DPRINTK(P9_DEBUG_MUX,
 347                                   "Attempting to cleanup non-free tag %d,%d\n",
 348                                   row, col);
 349                                 /* TODO: delay execution of cleanup */
 350                                 return;
 351                         }
 352                 }
 353         }
 354
 355         if (c->tagpool) {
 356                 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
 357                 p9_idpool_destroy(c->tagpool);
 358         }
 359
 360         /* free requests associated with tags */
 361         for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
 362                 for (col = 0; col < P9_ROW_MAXTAG; col++) {
 363                         kfree(c->reqs[row][col].wq);
 364                         kfree(c->reqs[row][col].tc);
 365                         kfree(c->reqs[row][col].rc);
 366                 }
 367                 kfree(c->reqs[row]);
 368         }
 369         c->max_tag = 0;
 370 }
 371
 372 /**
 373  * p9_free_req - free a request and clean-up as necessary
 374  * c: client state
 375  * r: request to release
 376  *
 377  */
 378
 379 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
 380 {
 381         int tag = r->tc->tag;
 382         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
 383
 384         r->status = REQ_STATUS_IDLE;
 385         if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
 386                 p9_idpool_put(tag, c->tagpool);
 387 }
 388
 389 /**
 390  * p9_client_cb - call back from transport to client
 391  * c: client state
 392  * req: request received
 393  *
 394  */
 395 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
 396 {
 397         P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
 398         wake_up(req->wq);
 399         P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
 400 }
 401 EXPORT_SYMBOL(p9_client_cb);
 402
 403 /**
 404  * p9_parse_header - parse header arguments out of a packet
 405  * @pdu: packet to parse
 406  * @size: size of packet
 407  * @type: type of request
 408  * @tag: tag of packet
 409  * @rewind: set if we need to rewind offset afterwards
 410  */
 411
 412 int
 413 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
 414                                                                 int rewind)
 415 {
 416         int8_t r_type;
 417         int16_t r_tag;
 418         int32_t r_size;
 419         int offset = pdu->offset;
 420         int err;
 421
 422         pdu->offset = 0;
 423         if (pdu->size == 0)
 424                 pdu->size = 7;
 425
 426         err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
 427         if (err)
 428                 goto rewind_and_exit;
 429
 430         pdu->size = r_size;
 431         pdu->id = r_type;
 432         pdu->tag = r_tag;
 433
 434         P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
 435                                                         pdu->id, pdu->tag);
 436
 437         if (type)
 438                 *type = r_type;
 439         if (tag)
 440                 *tag = r_tag;
 441         if (size)
 442                 *size = r_size;
 443
 444
 445 rewind_and_exit:
 446         if (rewind)
 447                 pdu->offset = offset;
 448         return err;
 449 }
 450 EXPORT_SYMBOL(p9_parse_header);
 451
 452 /**
 453  * p9_check_errors - check 9p packet for error return and process it
 454  * @c: current client instance
 455  * @req: request to parse and check for error conditions
 456  *
 457  * returns error code if one is discovered, otherwise returns 0
 458  *
 459  * this will have to be more complicated if we have multiple
 460  * error packet types
 461  */
 462
 463 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
 464 {
 465         int8_t type;
 466         int err;
 467         int ecode;
 468
 469         err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
 470         /*
 471          * dump the response from server
 472          * This should be after check errors which poplulate pdu_fcall.
 473          */
 474         trace_9p_protocol_dump(c, req->rc);
 475         if (err) {
 476                 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
 477                 return err;
 478         }
 479         if (type != P9_RERROR && type != P9_RLERROR)
 480                 return 0;
 481
 482         if (!p9_is_proto_dotl(c)) {
 483                 char *ename;
 484                 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
 485                                   &ename, &ecode);
 486                 if (err)
 487                         goto out_err;
 488
 489                 if (p9_is_proto_dotu(c))
 490                         err = -ecode;
 491
 492                 if (!err || !IS_ERR_VALUE(err)) {
 493                         err = p9_errstr2errno(ename, strlen(ename));
 494
 495                         P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
 496                                    -ecode, ename);
 497                 }
 498                 kfree(ename);
 499         } else {
 500                 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
 501                 err = -ecode;
 502
 503                 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
 504         }
 505
 506         return err;
 507
 508 out_err:
 509         P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
 510
 511         return err;
 512 }
 513
 514 /**
 515  * p9_check_zc_errors - check 9p packet for error return and process it
 516  * @c: current client instance
 517  * @req: request to parse and check for error conditions
 518  * @in_hdrlen: Size of response protocol buffer.
 519  *
 520  * returns error code if one is discovered, otherwise returns 0
 521  *
 522  * this will have to be more complicated if we have multiple
 523  * error packet types
 524  */
 525
 526 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
 527                               char *uidata, int in_hdrlen, int kern_buf)
 528 {
 529         int err;
 530         int ecode;
 531         int8_t type;
 532         char *ename = NULL;
 533
 534         err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
 535         /*
 536          * dump the response from server
 537          * This should be after parse_header which poplulate pdu_fcall.
 538          */
 539         trace_9p_protocol_dump(c, req->rc);
 540         if (err) {
 541                 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
 542                 return err;
 543         }
 544
 545         if (type != P9_RERROR && type != P9_RLERROR)
 546                 return 0;
 547
 548         if (!p9_is_proto_dotl(c)) {
 549                 /* Error is reported in string format */
 550                 uint16_t len;
 551                 /* 7 = header size for RERROR, 2 is the size of string len; */
 552                 int inline_len = in_hdrlen - (7 + 2);
 553
 554                 /* Read the size of error string */
 555                 err = p9pdu_readf(req->rc, c->proto_version, "w", &len);
 556                 if (err)
 557                         goto out_err;
 558
 559                 ename = kmalloc(len + 1, GFP_NOFS);
 560                 if (!ename) {
 561                         err = -ENOMEM;
 562                         goto out_err;
 563                 }
 564                 if (len <= inline_len) {
 565                         /* We have error in protocol buffer itself */
 566                         if (pdu_read(req->rc, ename, len)) {
 567                                 err = -EFAULT;
 568                                 goto out_free;
 569
 570                         }
 571                 } else {
 572                         /*
 573                          *  Part of the data is in user space buffer.
 574                          */
 575                         if (pdu_read(req->rc, ename, inline_len)) {
 576                                 err = -EFAULT;
 577                                 goto out_free;
 578
 579                         }
 580                         if (kern_buf) {
 581                                 memcpy(ename + inline_len, uidata,
 582                                        len - inline_len);
 583                         } else {
 584                                 err = copy_from_user(ename + inline_len,
 585                                                      uidata, len - inline_len);
 586                                 if (err) {
 587                                         err = -EFAULT;
 588                                         goto out_free;
 589                                 }
 590                         }
 591                 }
 592                 ename[len] = 0;
 593                 if (p9_is_proto_dotu(c)) {
 594                         /* For dotu we also have error code */
 595                         err = p9pdu_readf(req->rc,
 596                                           c->proto_version, "d", &ecode);
 597                         if (err)
 598                                 goto out_free;
 599                         err = -ecode;
 600                 }
 601                 if (!err || !IS_ERR_VALUE(err)) {
 602                         err = p9_errstr2errno(ename, strlen(ename));
 603
 604                         P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
 605                                    -ecode, ename);
 606                 }
 607                 kfree(ename);
 608         } else {
 609                 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
 610                 err = -ecode;
 611
 612                 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
 613         }
 614         return err;
 615
 616 out_free:
 617         kfree(ename);
 618 out_err:
 619         P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
 620         return err;
 621 }
 622
 623 static struct p9_req_t *
 624 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
 625
 626 /**
 627  * p9_client_flush - flush (cancel) a request
 628  * @c: client state
 629  * @oldreq: request to cancel
 630  *
 631  * This sents a flush for a particular request and links
 632  * the flush request to the original request.  The current
 633  * code only supports a single flush request although the protocol
 634  * allows for multiple flush requests to be sent for a single request.
 635  *
 636  */
 637
 638 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
 639 {
 640         struct p9_req_t *req;
 641         int16_t oldtag;
 642         int err;
 643
 644         err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
 645         if (err)
 646                 return err;
 647
 648         P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
 649
 650         req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
 651         if (IS_ERR(req))
 652                 return PTR_ERR(req);
 653
 654
 655         /* if we haven't received a response for oldreq,
 656            remove it from the list. */
 657         spin_lock(&c->lock);
 658         if (oldreq->status == REQ_STATUS_FLSH)
 659                 list_del(&oldreq->req_list);
 660         spin_unlock(&c->lock);
 661
 662         p9_free_req(c, req);
 663         return 0;
 664 }
 665
 666 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
 667                                               int8_t type, int req_size,
 668                                               const char *fmt, va_list ap)
 669 {
 670         int tag, err;
 671         struct p9_req_t *req;
 672
 673         P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
 674
 675         /* we allow for any status other than disconnected */
 676         if (c->status == Disconnected)
 677                 return ERR_PTR(-EIO);
 678
 679         /* if status is begin_disconnected we allow only clunk request */
 680         if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
 681                 return ERR_PTR(-EIO);
 682
 683         tag = P9_NOTAG;
 684         if (type != P9_TVERSION) {
 685                 tag = p9_idpool_get(c->tagpool);
 686                 if (tag < 0)
 687                         return ERR_PTR(-ENOMEM);
 688         }
 689
 690         req = p9_tag_alloc(c, tag, req_size);
 691         if (IS_ERR(req))
 692                 return req;
 693
 694         /* marshall the data */
 695         p9pdu_prepare(req->tc, tag, type);
 696         err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
 697         if (err)
 698                 goto reterr;
 699         p9pdu_finalize(c, req->tc);
 700         trace_9p_client_req(c, type, tag);
 701         return req;
 702 reterr:
 703         p9_free_req(c, req);
 704         return ERR_PTR(err);
 705 }
 706
 707 /**
 708  * p9_client_rpc - issue a request and wait for a response
 709  * @c: client session
 710  * @type: type of request
 711  * @fmt: protocol format string (see protocol.c)
 712  *
 713  * Returns request structure (which client must free using p9_free_req)
 714  */
 715
 716 static struct p9_req_t *
 717 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
 718 {
 719         va_list ap;
 720         int sigpending, err;
 721         unsigned long flags;
 722         struct p9_req_t *req;
 723
 724         va_start(ap, fmt);
 725         req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
 726         va_end(ap);
 727         if (IS_ERR(req))
 728                 return req;
 729
 730         if (signal_pending(current)) {
 731                 sigpending = 1;
 732                 clear_thread_flag(TIF_SIGPENDING);
 733         } else
 734                 sigpending = 0;
 735
 736         err = c->trans_mod->request(c, req);
 737         if (err < 0) {
 738                 if (err != -ERESTARTSYS && err != -EFAULT)
 739                         c->status = Disconnected;
 740                 goto reterr;
 741         }
 742         /* Wait for the response */
 743         err = wait_event_interruptible(*req->wq,
 744                                        req->status >= REQ_STATUS_RCVD);
 745
 746         if (req->status == REQ_STATUS_ERROR) {
 747                 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
 748                 err = req->t_err;
 749         }
 750         if ((err == -ERESTARTSYS) && (c->status == Connected)) {
 751                 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
 752                 sigpending = 1;
 753                 clear_thread_flag(TIF_SIGPENDING);
 754
 755                 if (c->trans_mod->cancel(c, req))
 756                         p9_client_flush(c, req);
 757
 758                 /* if we received the response anyway, don't signal error */
 759                 if (req->status == REQ_STATUS_RCVD)
 760                         err = 0;
 761         }
 762         if (sigpending) {
 763                 spin_lock_irqsave(&current->sighand->siglock, flags);
 764                 recalc_sigpending();
 765                 spin_unlock_irqrestore(&current->sighand->siglock, flags);
 766         }
 767         if (err < 0)
 768                 goto reterr;
 769
 770         err = p9_check_errors(c, req);
 771         trace_9p_client_res(c, type, req->rc->tag, err);
 772         if (!err)
 773                 return req;
 774 reterr:
 775         p9_free_req(c, req);
 776         return ERR_PTR(err);
 777 }
 778
 779 /**
 780  * p9_client_zc_rpc - issue a request and wait for a response
 781  * @c: client session
 782  * @type: type of request
 783  * @uidata: user bffer that should be ued for zero copy read
 784  * @uodata: user buffer that shoud be user for zero copy write
 785  * @inlen: read buffer size
 786  * @olen: write buffer size
 787  * @hdrlen: reader header size, This is the size of response protocol data
 788  * @fmt: protocol format string (see protocol.c)
 789  *
 790  * Returns request structure (which client must free using p9_free_req)
 791  */
 792 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
 793                                          char *uidata, char *uodata,
 794                                          int inlen, int olen, int in_hdrlen,
 795                                          int kern_buf, const char *fmt, ...)
 796 {
 797         va_list ap;
 798         int sigpending, err;
 799         unsigned long flags;
 800         struct p9_req_t *req;
 801
 802         va_start(ap, fmt);
 803         /*
 804          * We allocate a inline protocol data of only 4k bytes.
 805          * The actual content is passed in zero-copy fashion.
 806          */
 807         req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
 808         va_end(ap);
 809         if (IS_ERR(req))
 810                 return req;
 811
 812         if (signal_pending(current)) {
 813                 sigpending = 1;
 814                 clear_thread_flag(TIF_SIGPENDING);
 815         } else
 816                 sigpending = 0;
 817
 818         /* If we are called with KERNEL_DS force kern_buf */
 819         if (segment_eq(get_fs(), KERNEL_DS))
 820                 kern_buf = 1;
 821
 822         err = c->trans_mod->zc_request(c, req, uidata, uodata,
 823                                        inlen, olen, in_hdrlen, kern_buf);
 824         if (err < 0) {
 825                 if (err == -EIO)
 826                         c->status = Disconnected;
 827                 if (err != -ERESTARTSYS)
 828                         goto reterr;
 829         }
 830         if (req->status == REQ_STATUS_ERROR) {
 831                 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
 832                 err = req->t_err;
 833         }
 834         if ((err == -ERESTARTSYS) && (c->status == Connected)) {
 835                 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
 836                 sigpending = 1;
 837                 clear_thread_flag(TIF_SIGPENDING);
 838
 839                 if (c->trans_mod->cancel(c, req))
 840                         p9_client_flush(c, req);
 841
 842                 /* if we received the response anyway, don't signal error */
 843                 if (req->status == REQ_STATUS_RCVD)
 844                         err = 0;
 845         }
 846         if (sigpending) {
 847                 spin_lock_irqsave(&current->sighand->siglock, flags);
 848                 recalc_sigpending();
 849                 spin_unlock_irqrestore(&current->sighand->siglock, flags);
 850         }
 851         if (err < 0)
 852                 goto reterr;
 853
 854         err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
 855         trace_9p_client_res(c, type, req->rc->tag, err);
 856         if (!err)
 857                 return req;
 858 reterr:
 859         p9_free_req(c, req);
 860         return ERR_PTR(err);
 861 }
 862
 863 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
 864 {
 865         int ret;
 866         struct p9_fid *fid;
 867         unsigned long flags;
 868
 869         P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
 870         fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
 871         if (!fid)
 872                 return ERR_PTR(-ENOMEM);
 873
 874         ret = p9_idpool_get(clnt->fidpool);
 875         if (ret < 0) {
 876                 ret = -ENOSPC;
 877                 goto error;
 878         }
 879         fid->fid = ret;
 880
 881         memset(&fid->qid, 0, sizeof(struct p9_qid));
 882         fid->mode = -1;
 883         fid->uid = current_fsuid();
 884         fid->clnt = clnt;
 885         fid->rdir = NULL;
 886         spin_lock_irqsave(&clnt->lock, flags);
 887         list_add(&fid->flist, &clnt->fidlist);
 888         spin_unlock_irqrestore(&clnt->lock, flags);
 889
 890         return fid;
 891
 892 error:
 893         kfree(fid);
 894         return ERR_PTR(ret);
 895 }
 896
 897 static void p9_fid_destroy(struct p9_fid *fid)
 898 {
 899         struct p9_client *clnt;
 900         unsigned long flags;
 901
 902         P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
 903         clnt = fid->clnt;
 904         p9_idpool_put(fid->fid, clnt->fidpool);
 905         spin_lock_irqsave(&clnt->lock, flags);
 906         list_del(&fid->flist);
 907         spin_unlock_irqrestore(&clnt->lock, flags);
 908         kfree(fid->rdir);
 909         kfree(fid);
 910 }
 911
 912 static int p9_client_version(struct p9_client *c)
 913 {
 914         int err = 0;
 915         struct p9_req_t *req;
 916         char *version;
 917         int msize;
 918
 919         P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
 920                                                 c->msize, c->proto_version);
 921
 922         switch (c->proto_version) {
 923         case p9_proto_2000L:
 924                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 925                                         c->msize, "9P2000.L");
 926                 break;
 927         case p9_proto_2000u:
 928                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 929                                         c->msize, "9P2000.u");
 930                 break;
 931         case p9_proto_legacy:
 932                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 933                                         c->msize, "9P2000");
 934                 break;
 935         default:
 936                 return -EINVAL;
 937                 break;
 938         }
 939
 940         if (IS_ERR(req))
 941                 return PTR_ERR(req);
 942
 943         err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
 944         if (err) {
 945                 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
 946                 trace_9p_protocol_dump(c, req->rc);
 947                 goto error;
 948         }
 949
 950         P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
 951         if (!strncmp(version, "9P2000.L", 8))
 952                 c->proto_version = p9_proto_2000L;
 953         else if (!strncmp(version, "9P2000.u", 8))
 954                 c->proto_version = p9_proto_2000u;
 955         else if (!strncmp(version, "9P2000", 6))
 956                 c->proto_version = p9_proto_legacy;
 957         else {
 958                 err = -EREMOTEIO;
 959                 goto error;
 960         }
 961
 962         if (msize < c->msize)
 963                 c->msize = msize;
 964
 965 error:
 966         kfree(version);
 967         p9_free_req(c, req);
 968
 969         return err;
 970 }
 971
 972 struct p9_client *p9_client_create(const char *dev_name, char *options)
 973 {
 974         int err;
 975         struct p9_client *clnt;
 976
 977         err = 0;
 978         clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
 979         if (!clnt)
 980                 return ERR_PTR(-ENOMEM);
 981
 982         clnt->trans_mod = NULL;
 983         clnt->trans = NULL;
 984         spin_lock_init(&clnt->lock);
 985         INIT_LIST_HEAD(&clnt->fidlist);
 986
 987         err = p9_tag_init(clnt);
 988         if (err < 0)
 989                 goto free_client;
 990
 991         err = parse_opts(options, clnt);
 992         if (err < 0)
 993                 goto destroy_tagpool;
 994
 995         if (!clnt->trans_mod)
 996                 clnt->trans_mod = v9fs_get_default_trans();
 997
 998         if (clnt->trans_mod == NULL) {
 999                 err = -EPROTONOSUPPORT;
1000                 P9_DPRINTK(P9_DEBUG_ERROR,
1001                                 "No transport defined or default transport\n");
1002                 goto destroy_tagpool;
1003         }
1004
1005         clnt->fidpool = p9_idpool_create();
1006         if (IS_ERR(clnt->fidpool)) {
1007                 err = PTR_ERR(clnt->fidpool);
1008                 goto put_trans;
1009         }
1010
1011         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1012                 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1013
1014         err = clnt->trans_mod->create(clnt, dev_name, options);
1015         if (err)
1016                 goto destroy_fidpool;
1017
1018         if (clnt->msize > clnt->trans_mod->maxsize)
1019                 clnt->msize = clnt->trans_mod->maxsize;
1020
1021         err = p9_client_version(clnt);
1022         if (err)
1023                 goto close_trans;
1024
1025         return clnt;
1026
1027 close_trans:
1028         clnt->trans_mod->close(clnt);
1029 destroy_fidpool:
1030         p9_idpool_destroy(clnt->fidpool);
1031 put_trans:
1032         v9fs_put_trans(clnt->trans_mod);
1033 destroy_tagpool:
1034         p9_idpool_destroy(clnt->tagpool);
1035 free_client:
1036         kfree(clnt);
1037         return ERR_PTR(err);
1038 }
1039 EXPORT_SYMBOL(p9_client_create);
1040
1041 void p9_client_destroy(struct p9_client *clnt)
1042 {
1043         struct p9_fid *fid, *fidptr;
1044
1045         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
1046
1047         if (clnt->trans_mod)
1048                 clnt->trans_mod->close(clnt);
1049
1050         v9fs_put_trans(clnt->trans_mod);
1051
1052         list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1053                 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
1054                 p9_fid_destroy(fid);
1055         }
1056
1057         if (clnt->fidpool)
1058                 p9_idpool_destroy(clnt->fidpool);
1059
1060         p9_tag_cleanup(clnt);
1061
1062         kfree(clnt);
1063 }
1064 EXPORT_SYMBOL(p9_client_destroy);
1065
1066 void p9_client_disconnect(struct p9_client *clnt)
1067 {
1068         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
1069         clnt->status = Disconnected;
1070 }
1071 EXPORT_SYMBOL(p9_client_disconnect);
1072
1073 void p9_client_begin_disconnect(struct p9_client *clnt)
1074 {
1075         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
1076         clnt->status = BeginDisconnect;
1077 }
1078 EXPORT_SYMBOL(p9_client_begin_disconnect);
1079
1080 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1081         char *uname, u32 n_uname, char *aname)
1082 {
1083         int err = 0;
1084         struct p9_req_t *req;
1085         struct p9_fid *fid;
1086         struct p9_qid qid;
1087
1088
1089         P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1090                    afid ? afid->fid : -1, uname, aname);
1091         fid = p9_fid_create(clnt);
1092         if (IS_ERR(fid)) {
1093                 err = PTR_ERR(fid);
1094                 fid = NULL;
1095                 goto error;
1096         }
1097
1098         req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
1099                         afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1100         if (IS_ERR(req)) {
1101                 err = PTR_ERR(req);
1102                 goto error;
1103         }
1104
1105         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1106         if (err) {
1107                 trace_9p_protocol_dump(clnt, req->rc);
1108                 p9_free_req(clnt, req);
1109                 goto error;
1110         }
1111
1112         P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1113                                         qid.type,
1114                                         (unsigned long long)qid.path,
1115                                         qid.version);
1116
1117         memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1118
1119         p9_free_req(clnt, req);
1120         return fid;
1121
1122 error:
1123         if (fid)
1124                 p9_fid_destroy(fid);
1125         return ERR_PTR(err);
1126 }
1127 EXPORT_SYMBOL(p9_client_attach);
1128
1129 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1130                 char **wnames, int clone)
1131 {
1132         int err;
1133         struct p9_client *clnt;
1134         struct p9_fid *fid;
1135         struct p9_qid *wqids;
1136         struct p9_req_t *req;
1137         uint16_t nwqids, count;
1138
1139         err = 0;
1140         wqids = NULL;
1141         clnt = oldfid->clnt;
1142         if (clone) {
1143                 fid = p9_fid_create(clnt);
1144                 if (IS_ERR(fid)) {
1145                         err = PTR_ERR(fid);
1146                         fid = NULL;
1147                         goto error;
1148                 }
1149
1150                 fid->uid = oldfid->uid;
1151         } else
1152                 fid = oldfid;
1153
1154
1155         P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1156                 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1157
1158         req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1159                                                                 nwname, wnames);
1160         if (IS_ERR(req)) {
1161                 err = PTR_ERR(req);
1162                 goto error;
1163         }
1164
1165         err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1166         if (err) {
1167                 trace_9p_protocol_dump(clnt, req->rc);
1168                 p9_free_req(clnt, req);
1169                 goto clunk_fid;
1170         }
1171         p9_free_req(clnt, req);
1172
1173         P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1174
1175         if (nwqids != nwname) {
1176                 err = -ENOENT;
1177                 goto clunk_fid;
1178         }
1179
1180         for (count = 0; count < nwqids; count++)
1181                 P9_DPRINTK(P9_DEBUG_9P, "<<<     [%d] %x.%llx.%x\n",
1182                         count, wqids[count].type,
1183                         (unsigned long long)wqids[count].path,
1184                         wqids[count].version);
1185
1186         if (nwname)
1187                 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1188         else
1189                 fid->qid = oldfid->qid;
1190
1191         kfree(wqids);
1192         return fid;
1193
1194 clunk_fid:
1195         kfree(wqids);
1196         p9_client_clunk(fid);
1197         fid = NULL;
1198
1199 error:
1200         if (fid && (fid != oldfid))
1201                 p9_fid_destroy(fid);
1202
1203         return ERR_PTR(err);
1204 }
1205 EXPORT_SYMBOL(p9_client_walk);
1206
1207 int p9_client_open(struct p9_fid *fid, int mode)
1208 {
1209         int err;
1210         struct p9_client *clnt;
1211         struct p9_req_t *req;
1212         struct p9_qid qid;
1213         int iounit;
1214
1215         clnt = fid->clnt;
1216         P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1217                 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1218         err = 0;
1219
1220         if (fid->mode != -1)
1221                 return -EINVAL;
1222
1223         if (p9_is_proto_dotl(clnt))
1224                 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1225         else
1226                 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1227         if (IS_ERR(req)) {
1228                 err = PTR_ERR(req);
1229                 goto error;
1230         }
1231
1232         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1233         if (err) {
1234                 trace_9p_protocol_dump(clnt, req->rc);
1235                 goto free_and_error;
1236         }
1237
1238         P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1239                 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN",  qid.type,
1240                 (unsigned long long)qid.path, qid.version, iounit);
1241
1242         fid->mode = mode;
1243         fid->iounit = iounit;
1244
1245 free_and_error:
1246         p9_free_req(clnt, req);
1247 error:
1248         return err;
1249 }
1250 EXPORT_SYMBOL(p9_client_open);
1251
1252 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1253                 gid_t gid, struct p9_qid *qid)
1254 {
1255         int err = 0;
1256         struct p9_client *clnt;
1257         struct p9_req_t *req;
1258         int iounit;
1259
1260         P9_DPRINTK(P9_DEBUG_9P,
1261                         ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1262                         ofid->fid, name, flags, mode, gid);
1263         clnt = ofid->clnt;
1264
1265         if (ofid->mode != -1)
1266                 return -EINVAL;
1267
1268         req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1269                         mode, gid);
1270         if (IS_ERR(req)) {
1271                 err = PTR_ERR(req);
1272                 goto error;
1273         }
1274
1275         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1276         if (err) {
1277                 trace_9p_protocol_dump(clnt, req->rc);
1278                 goto free_and_error;
1279         }
1280
1281         P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1282                         qid->type,
1283                         (unsigned long long)qid->path,
1284                         qid->version, iounit);
1285
1286         ofid->mode = mode;
1287         ofid->iounit = iounit;
1288
1289 free_and_error:
1290         p9_free_req(clnt, req);
1291 error:
1292         return err;
1293 }
1294 EXPORT_SYMBOL(p9_client_create_dotl);
1295
1296 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1297                      char *extension)
1298 {
1299         int err;
1300         struct p9_client *clnt;
1301         struct p9_req_t *req;
1302         struct p9_qid qid;
1303         int iounit;
1304
1305         P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1306                                                 fid->fid, name, perm, mode);
1307         err = 0;
1308         clnt = fid->clnt;
1309
1310         if (fid->mode != -1)
1311                 return -EINVAL;
1312
1313         req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1314                                 mode, extension);
1315         if (IS_ERR(req)) {
1316                 err = PTR_ERR(req);
1317                 goto error;
1318         }
1319
1320         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1321         if (err) {
1322                 trace_9p_protocol_dump(clnt, req->rc);
1323                 goto free_and_error;
1324         }
1325
1326         P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1327                                 qid.type,
1328                                 (unsigned long long)qid.path,
1329                                 qid.version, iounit);
1330
1331         fid->mode = mode;
1332         fid->iounit = iounit;
1333
1334 free_and_error:
1335         p9_free_req(clnt, req);
1336 error:
1337         return err;
1338 }
1339 EXPORT_SYMBOL(p9_client_fcreate);
1340
1341 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1342                 struct p9_qid *qid)
1343 {
1344         int err = 0;
1345         struct p9_client *clnt;
1346         struct p9_req_t *req;
1347
1348         P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s  symtgt %s\n",
1349                         dfid->fid, name, symtgt);
1350         clnt = dfid->clnt;
1351
1352         req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1353                         gid);
1354         if (IS_ERR(req)) {
1355                 err = PTR_ERR(req);
1356                 goto error;
1357         }
1358
1359         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1360         if (err) {
1361                 trace_9p_protocol_dump(clnt, req->rc);
1362                 goto free_and_error;
1363         }
1364
1365         P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1366                         qid->type, (unsigned long long)qid->path, qid->version);
1367
1368 free_and_error:
1369         p9_free_req(clnt, req);
1370 error:
1371         return err;
1372 }
1373 EXPORT_SYMBOL(p9_client_symlink);
1374
1375 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1376 {
1377         struct p9_client *clnt;
1378         struct p9_req_t *req;
1379
1380         P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1381                         dfid->fid, oldfid->fid, newname);
1382         clnt = dfid->clnt;
1383         req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1384                         newname);
1385         if (IS_ERR(req))
1386                 return PTR_ERR(req);
1387
1388         P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1389         p9_free_req(clnt, req);
1390         return 0;
1391 }
1392 EXPORT_SYMBOL(p9_client_link);
1393
1394 int p9_client_fsync(struct p9_fid *fid, int datasync)
1395 {
1396         int err;
1397         struct p9_client *clnt;
1398         struct p9_req_t *req;
1399
1400         P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1401                         fid->fid, datasync);
1402         err = 0;
1403         clnt = fid->clnt;
1404
1405         req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1406         if (IS_ERR(req)) {
1407                 err = PTR_ERR(req);
1408                 goto error;
1409         }
1410
1411         P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1412
1413         p9_free_req(clnt, req);
1414
1415 error:
1416         return err;
1417 }
1418 EXPORT_SYMBOL(p9_client_fsync);
1419
1420 int p9_client_clunk(struct p9_fid *fid)
1421 {
1422         int err;
1423         struct p9_client *clnt;
1424         struct p9_req_t *req;
1425
1426         if (!fid) {
1427                 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1428                 dump_stack();
1429                 return 0;
1430         }
1431
1432         P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1433         err = 0;
1434         clnt = fid->clnt;
1435
1436         req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1437         if (IS_ERR(req)) {
1438                 err = PTR_ERR(req);
1439                 goto error;
1440         }
1441
1442         P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1443
1444         p9_free_req(clnt, req);
1445 error:
1446         /*
1447          * Fid is not valid even after a failed clunk
1448          */
1449         p9_fid_destroy(fid);
1450         return err;
1451 }
1452 EXPORT_SYMBOL(p9_client_clunk);
1453
1454 int p9_client_remove(struct p9_fid *fid)
1455 {
1456         int err;
1457         struct p9_client *clnt;
1458         struct p9_req_t *req;
1459
1460         P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1461         err = 0;
1462         clnt = fid->clnt;
1463
1464         req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1465         if (IS_ERR(req)) {
1466                 err = PTR_ERR(req);
1467                 goto error;
1468         }
1469
1470         P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1471
1472         p9_free_req(clnt, req);
1473 error:
1474         p9_fid_destroy(fid);
1475         return err;
1476 }
1477 EXPORT_SYMBOL(p9_client_remove);
1478
1479 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1480 {
1481         int err = 0;
1482         struct p9_req_t *req;
1483         struct p9_client *clnt;
1484
1485         P9_DPRINTK(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1486                    dfid->fid, name, flags);
1487
1488         clnt = dfid->clnt;
1489         req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1490         if (IS_ERR(req)) {
1491                 err = PTR_ERR(req);
1492                 goto error;
1493         }
1494         P9_DPRINTK(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1495
1496         p9_free_req(clnt, req);
1497 error:
1498         return err;
1499 }
1500 EXPORT_SYMBOL(p9_client_unlinkat);
1501
1502 int
1503 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1504                                                                 u32 count)
1505 {
1506         char *dataptr;
1507         int kernel_buf = 0;
1508         struct p9_req_t *req;
1509         struct p9_client *clnt;
1510         int err, rsize, non_zc = 0;
1511
1512
1513         P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1514                    fid->fid, (long long unsigned) offset, count);
1515         err = 0;
1516         clnt = fid->clnt;
1517
1518         rsize = fid->iounit;
1519         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1520                 rsize = clnt->msize - P9_IOHDRSZ;
1521
1522         if (count < rsize)
1523                 rsize = count;
1524
1525         /* Don't bother zerocopy for small IO (< 1024) */
1526         if (clnt->trans_mod->zc_request && rsize > 1024) {
1527                 char *indata;
1528                 if (data) {
1529                         kernel_buf = 1;
1530                         indata = data;
1531                 } else
1532                         indata = (char *)udata;
1533                 /*
1534                  * response header len is 11
1535                  * PDU Header(7) + IO Size (4)
1536                  */
1537                 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1538                                        11, kernel_buf, "dqd", fid->fid,
1539                                        offset, rsize);
1540         } else {
1541                 non_zc = 1;
1542                 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1543                                     rsize);
1544         }
1545         if (IS_ERR(req)) {
1546                 err = PTR_ERR(req);
1547                 goto error;
1548         }
1549
1550         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1551         if (err) {
1552                 trace_9p_protocol_dump(clnt, req->rc);
1553                 goto free_and_error;
1554         }
1555
1556         P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1557
1558         if (non_zc) {
1559                 if (data) {
1560                         memmove(data, dataptr, count);
1561                 } else {
1562                         err = copy_to_user(udata, dataptr, count);
1563                         if (err) {
1564                                 err = -EFAULT;
1565                                 goto free_and_error;
1566                         }
1567                 }
1568         }
1569         p9_free_req(clnt, req);
1570         return count;
1571
1572 free_and_error:
1573         p9_free_req(clnt, req);
1574 error:
1575         return err;
1576 }
1577 EXPORT_SYMBOL(p9_client_read);
1578
1579 int
1580 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1581                                                         u64 offset, u32 count)
1582 {
1583         int err, rsize;
1584         int kernel_buf = 0;
1585         struct p9_client *clnt;
1586         struct p9_req_t *req;
1587
1588         P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1589                                 fid->fid, (long long unsigned) offset, count);
1590         err = 0;
1591         clnt = fid->clnt;
1592
1593         rsize = fid->iounit;
1594         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1595                 rsize = clnt->msize - P9_IOHDRSZ;
1596
1597         if (count < rsize)
1598                 rsize = count;
1599
1600         /* Don't bother zerocopy for small IO (< 1024) */
1601         if (clnt->trans_mod->zc_request && rsize > 1024) {
1602                 char *odata;
1603                 if (data) {
1604                         kernel_buf = 1;
1605                         odata = data;
1606                 } else
1607                         odata = (char *)udata;
1608                 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1609                                        P9_ZC_HDR_SZ, kernel_buf, "dqd",
1610                                        fid->fid, offset, rsize);
1611         } else {
1612                 if (data)
1613                         req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1614                                             offset, rsize, data);
1615                 else
1616                         req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1617                                             offset, rsize, udata);
1618         }
1619         if (IS_ERR(req)) {
1620                 err = PTR_ERR(req);
1621                 goto error;
1622         }
1623
1624         err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1625         if (err) {
1626                 trace_9p_protocol_dump(clnt, req->rc);
1627                 goto free_and_error;
1628         }
1629
1630         P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1631
1632         p9_free_req(clnt, req);
1633         return count;
1634
1635 free_and_error:
1636         p9_free_req(clnt, req);
1637 error:
1638         return err;
1639 }
1640 EXPORT_SYMBOL(p9_client_write);
1641
1642 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1643 {
1644         int err;
1645         struct p9_client *clnt;
1646         struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1647         struct p9_req_t *req;
1648         u16 ignored;
1649
1650         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1651
1652         if (!ret)
1653                 return ERR_PTR(-ENOMEM);
1654
1655         err = 0;
1656         clnt = fid->clnt;
1657
1658         req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1659         if (IS_ERR(req)) {
1660                 err = PTR_ERR(req);
1661                 goto error;
1662         }
1663
1664         err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1665         if (err) {
1666                 trace_9p_protocol_dump(clnt, req->rc);
1667                 p9_free_req(clnt, req);
1668                 goto error;
1669         }
1670
1671         P9_DPRINTK(P9_DEBUG_9P,
1672                 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1673                 "<<<    mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1674                 "<<<    name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1675                 "<<<    uid=%d gid=%d n_muid=%d\n",
1676                 ret->size, ret->type, ret->dev, ret->qid.type,
1677                 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1678                 ret->atime, ret->mtime, (unsigned long long)ret->length,
1679                 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1680                 ret->n_uid, ret->n_gid, ret->n_muid);
1681
1682         p9_free_req(clnt, req);
1683         return ret;
1684
1685 error:
1686         kfree(ret);
1687         return ERR_PTR(err);
1688 }
1689 EXPORT_SYMBOL(p9_client_stat);
1690
1691 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1692                                                         u64 request_mask)
1693 {
1694         int err;
1695         struct p9_client *clnt;
1696         struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1697                                                                 GFP_KERNEL);
1698         struct p9_req_t *req;
1699
1700         P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1701                                                         fid->fid, request_mask);
1702
1703         if (!ret)
1704                 return ERR_PTR(-ENOMEM);
1705
1706         err = 0;
1707         clnt = fid->clnt;
1708
1709         req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1710         if (IS_ERR(req)) {
1711                 err = PTR_ERR(req);
1712                 goto error;
1713         }
1714
1715         err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1716         if (err) {
1717                 trace_9p_protocol_dump(clnt, req->rc);
1718                 p9_free_req(clnt, req);
1719                 goto error;
1720         }
1721
1722         P9_DPRINTK(P9_DEBUG_9P,
1723                 "<<< RGETATTR st_result_mask=%lld\n"
1724                 "<<< qid=%x.%llx.%x\n"
1725                 "<<< st_mode=%8.8x st_nlink=%llu\n"
1726                 "<<< st_uid=%d st_gid=%d\n"
1727                 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1728                 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1729                 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1730                 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1731                 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1732                 "<<< st_gen=%lld st_data_version=%lld",
1733                 ret->st_result_mask, ret->qid.type, ret->qid.path,
1734                 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1735                 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1736                 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1737                 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1738                 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1739                 ret->st_gen, ret->st_data_version);
1740
1741         p9_free_req(clnt, req);
1742         return ret;
1743
1744 error:
1745         kfree(ret);
1746         return ERR_PTR(err);
1747 }
1748 EXPORT_SYMBOL(p9_client_getattr_dotl);
1749
1750 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1751 {
1752         int ret;
1753
1754         /* NOTE: size shouldn't include its own length */
1755         /* size[2] type[2] dev[4] qid[13] */
1756         /* mode[4] atime[4] mtime[4] length[8]*/
1757         /* name[s] uid[s] gid[s] muid[s] */
1758         ret = 2+4+13+4+4+4+8+2+2+2+2;
1759
1760         if (wst->name)
1761                 ret += strlen(wst->name);
1762         if (wst->uid)
1763                 ret += strlen(wst->uid);
1764         if (wst->gid)
1765                 ret += strlen(wst->gid);
1766         if (wst->muid)
1767                 ret += strlen(wst->muid);
1768
1769         if ((proto_version == p9_proto_2000u) ||
1770                 (proto_version == p9_proto_2000L)) {
1771                 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1772                 if (wst->extension)
1773                         ret += strlen(wst->extension);
1774         }
1775
1776         return ret;
1777 }
1778
1779 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1780 {
1781         int err;
1782         struct p9_req_t *req;
1783         struct p9_client *clnt;
1784
1785         err = 0;
1786         clnt = fid->clnt;
1787         wst->size = p9_client_statsize(wst, clnt->proto_version);
1788         P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1789         P9_DPRINTK(P9_DEBUG_9P,
1790                 "     sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1791                 "     mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1792                 "     name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1793                 "     uid=%d gid=%d n_muid=%d\n",
1794                 wst->size, wst->type, wst->dev, wst->qid.type,
1795                 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1796                 wst->atime, wst->mtime, (unsigned long long)wst->length,
1797                 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1798                 wst->n_uid, wst->n_gid, wst->n_muid);
1799
1800         req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1801         if (IS_ERR(req)) {
1802                 err = PTR_ERR(req);
1803                 goto error;
1804         }
1805
1806         P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1807
1808         p9_free_req(clnt, req);
1809 error:
1810         return err;
1811 }
1812 EXPORT_SYMBOL(p9_client_wstat);
1813
1814 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1815 {
1816         int err;
1817         struct p9_req_t *req;
1818         struct p9_client *clnt;
1819
1820         err = 0;
1821         clnt = fid->clnt;
1822         P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1823         P9_DPRINTK(P9_DEBUG_9P,
1824                 "    valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1825                 "    atime_sec=%lld atime_nsec=%lld\n"
1826                 "    mtime_sec=%lld mtime_nsec=%lld\n",
1827                 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1828                 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1829                 p9attr->mtime_sec, p9attr->mtime_nsec);
1830
1831         req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1832
1833         if (IS_ERR(req)) {
1834                 err = PTR_ERR(req);
1835                 goto error;
1836         }
1837         P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1838         p9_free_req(clnt, req);
1839 error:
1840         return err;
1841 }
1842 EXPORT_SYMBOL(p9_client_setattr);
1843
1844 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1845 {
1846         int err;
1847         struct p9_req_t *req;
1848         struct p9_client *clnt;
1849
1850         err = 0;
1851         clnt = fid->clnt;
1852
1853         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1854
1855         req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1856         if (IS_ERR(req)) {
1857                 err = PTR_ERR(req);
1858                 goto error;
1859         }
1860
1861         err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1862                 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1863                 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1864         if (err) {
1865                 trace_9p_protocol_dump(clnt, req->rc);
1866                 p9_free_req(clnt, req);
1867                 goto error;
1868         }
1869
1870         P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1871                 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1872                 "fsid %llu namelen %ld\n",
1873                 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1874                 sb->blocks, sb->bfree, sb->bavail, sb->files,  sb->ffree,
1875                 sb->fsid, (long int)sb->namelen);
1876
1877         p9_free_req(clnt, req);
1878 error:
1879         return err;
1880 }
1881 EXPORT_SYMBOL(p9_client_statfs);
1882
1883 int p9_client_rename(struct p9_fid *fid,
1884                      struct p9_fid *newdirfid, const char *name)
1885 {
1886         int err;
1887         struct p9_req_t *req;
1888         struct p9_client *clnt;
1889
1890         err = 0;
1891         clnt = fid->clnt;
1892
1893         P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1894                         fid->fid, newdirfid->fid, name);
1895
1896         req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1897                         newdirfid->fid, name);
1898         if (IS_ERR(req)) {
1899                 err = PTR_ERR(req);
1900                 goto error;
1901         }
1902
1903         P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1904
1905         p9_free_req(clnt, req);
1906 error:
1907         return err;
1908 }
1909 EXPORT_SYMBOL(p9_client_rename);
1910
1911 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1912                        struct p9_fid *newdirfid, const char *new_name)
1913 {
1914         int err;
1915         struct p9_req_t *req;
1916         struct p9_client *clnt;
1917
1918         err = 0;
1919         clnt = olddirfid->clnt;
1920
1921         P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1922                    " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1923                    newdirfid->fid, new_name);
1924
1925         req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1926                             old_name, newdirfid->fid, new_name);
1927         if (IS_ERR(req)) {
1928                 err = PTR_ERR(req);
1929                 goto error;
1930         }
1931
1932         P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1933                    newdirfid->fid, new_name);
1934
1935         p9_free_req(clnt, req);
1936 error:
1937         return err;
1938 }
1939 EXPORT_SYMBOL(p9_client_renameat);
1940
1941 /*
1942  * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1943  */
1944 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1945                                 const char *attr_name, u64 *attr_size)
1946 {
1947         int err;
1948         struct p9_req_t *req;
1949         struct p9_client *clnt;
1950         struct p9_fid *attr_fid;
1951
1952         err = 0;
1953         clnt = file_fid->clnt;
1954         attr_fid = p9_fid_create(clnt);
1955         if (IS_ERR(attr_fid)) {
1956                 err = PTR_ERR(attr_fid);
1957                 attr_fid = NULL;
1958                 goto error;
1959         }
1960         P9_DPRINTK(P9_DEBUG_9P,
1961                 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1962                 file_fid->fid, attr_fid->fid, attr_name);
1963
1964         req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1965                         file_fid->fid, attr_fid->fid, attr_name);
1966         if (IS_ERR(req)) {
1967                 err = PTR_ERR(req);
1968                 goto error;
1969         }
1970         err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1971         if (err) {
1972                 trace_9p_protocol_dump(clnt, req->rc);
1973                 p9_free_req(clnt, req);
1974                 goto clunk_fid;
1975         }
1976         p9_free_req(clnt, req);
1977         P9_DPRINTK(P9_DEBUG_9P, "<<<  RXATTRWALK fid %d size %llu\n",
1978                 attr_fid->fid, *attr_size);
1979         return attr_fid;
1980 clunk_fid:
1981         p9_client_clunk(attr_fid);
1982         attr_fid = NULL;
1983 error:
1984         if (attr_fid && (attr_fid != file_fid))
1985                 p9_fid_destroy(attr_fid);
1986
1987         return ERR_PTR(err);
1988 }
1989 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1990
1991 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1992                         u64 attr_size, int flags)
1993 {
1994         int err;
1995         struct p9_req_t *req;
1996         struct p9_client *clnt;
1997
1998         P9_DPRINTK(P9_DEBUG_9P,
1999                 ">>> TXATTRCREATE fid %d name  %s size %lld flag %d\n",
2000                 fid->fid, name, (long long)attr_size, flags);
2001         err = 0;
2002         clnt = fid->clnt;
2003         req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2004                         fid->fid, name, attr_size, flags);
2005         if (IS_ERR(req)) {
2006                 err = PTR_ERR(req);
2007                 goto error;
2008         }
2009         P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2010         p9_free_req(clnt, req);
2011 error:
2012         return err;
2013 }
2014 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2015
2016 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2017 {
2018         int err, rsize, non_zc = 0;
2019         struct p9_client *clnt;
2020         struct p9_req_t *req;
2021         char *dataptr;
2022
2023         P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2024                                 fid->fid, (long long unsigned) offset, count);
2025
2026         err = 0;
2027         clnt = fid->clnt;
2028
2029         rsize = fid->iounit;
2030         if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2031                 rsize = clnt->msize - P9_READDIRHDRSZ;
2032
2033         if (count < rsize)
2034                 rsize = count;
2035
2036         /* Don't bother zerocopy for small IO (< 1024) */
2037         if (clnt->trans_mod->zc_request && rsize > 1024) {
2038                 /*
2039                  * response header len is 11
2040                  * PDU Header(7) + IO Size (4)
2041                  */
2042                 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2043                                        11, 1, "dqd", fid->fid, offset, rsize);
2044         } else {
2045                 non_zc = 1;
2046                 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2047                                     offset, rsize);
2048         }
2049         if (IS_ERR(req)) {
2050                 err = PTR_ERR(req);
2051                 goto error;
2052         }
2053
2054         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2055         if (err) {
2056                 trace_9p_protocol_dump(clnt, req->rc);
2057                 goto free_and_error;
2058         }
2059         if (rsize < count) {
2060                 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2061                 count = rsize;
2062         }
2063
2064         P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2065
2066         if (non_zc)
2067                 memmove(data, dataptr, count);
2068
2069         p9_free_req(clnt, req);
2070         return count;
2071
2072 free_and_error:
2073         p9_free_req(clnt, req);
2074 error:
2075         return err;
2076 }
2077 EXPORT_SYMBOL(p9_client_readdir);
2078
2079 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2080                         dev_t rdev, gid_t gid, struct p9_qid *qid)
2081 {
2082         int err;
2083         struct p9_client *clnt;
2084         struct p9_req_t *req;
2085
2086         err = 0;
2087         clnt = fid->clnt;
2088         P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2089                 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2090         req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
2091                 MAJOR(rdev), MINOR(rdev), gid);
2092         if (IS_ERR(req))
2093                 return PTR_ERR(req);
2094
2095         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2096         if (err) {
2097                 trace_9p_protocol_dump(clnt, req->rc);
2098                 goto error;
2099         }
2100         P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2101                                 (unsigned long long)qid->path, qid->version);
2102
2103 error:
2104         p9_free_req(clnt, req);
2105         return err;
2106
2107 }
2108 EXPORT_SYMBOL(p9_client_mknod_dotl);
2109
2110 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2111                                 gid_t gid, struct p9_qid *qid)
2112 {
2113         int err;
2114         struct p9_client *clnt;
2115         struct p9_req_t *req;
2116
2117         err = 0;
2118         clnt = fid->clnt;
2119         P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2120                  fid->fid, name, mode, gid);
2121         req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
2122                 gid);
2123         if (IS_ERR(req))
2124                 return PTR_ERR(req);
2125
2126         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2127         if (err) {
2128                 trace_9p_protocol_dump(clnt, req->rc);
2129                 goto error;
2130         }
2131         P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2132                                 (unsigned long long)qid->path, qid->version);
2133
2134 error:
2135         p9_free_req(clnt, req);
2136         return err;
2137
2138 }
2139 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2140
2141 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2142 {
2143         int err;
2144         struct p9_client *clnt;
2145         struct p9_req_t *req;
2146
2147         err = 0;
2148         clnt = fid->clnt;
2149         P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2150                         "start %lld length %lld proc_id %d client_id %s\n",
2151                         fid->fid, flock->type, flock->flags, flock->start,
2152                         flock->length, flock->proc_id, flock->client_id);
2153
2154         req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2155                                 flock->flags, flock->start, flock->length,
2156                                         flock->proc_id, flock->client_id);
2157
2158         if (IS_ERR(req))
2159                 return PTR_ERR(req);
2160
2161         err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2162         if (err) {
2163                 trace_9p_protocol_dump(clnt, req->rc);
2164                 goto error;
2165         }
2166         P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2167 error:
2168         p9_free_req(clnt, req);
2169         return err;
2170
2171 }
2172 EXPORT_SYMBOL(p9_client_lock_dotl);
2173
2174 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2175 {
2176         int err;
2177         struct p9_client *clnt;
2178         struct p9_req_t *req;
2179
2180         err = 0;
2181         clnt = fid->clnt;
2182         P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2183                 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2184                 glock->start, glock->length, glock->proc_id, glock->client_id);
2185
2186         req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid,  glock->type,
2187                 glock->start, glock->length, glock->proc_id, glock->client_id);
2188
2189         if (IS_ERR(req))
2190                 return PTR_ERR(req);
2191
2192         err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2193                         &glock->start, &glock->length, &glock->proc_id,
2194                         &glock->client_id);
2195         if (err) {
2196                 trace_9p_protocol_dump(clnt, req->rc);
2197                 goto error;
2198         }
2199         P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2200                 "proc_id %d client_id %s\n", glock->type, glock->start,
2201                 glock->length, glock->proc_id, glock->client_id);
2202 error:
2203         p9_free_req(clnt, req);
2204         return err;
2205 }
2206 EXPORT_SYMBOL(p9_client_getlock_dotl);
2207
2208 int p9_client_readlink(struct p9_fid *fid, char **target)
2209 {
2210         int err;
2211         struct p9_client *clnt;
2212         struct p9_req_t *req;
2213
2214         err = 0;
2215         clnt = fid->clnt;
2216         P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2217
2218         req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2219         if (IS_ERR(req))
2220                 return PTR_ERR(req);
2221
2222         err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2223         if (err) {
2224                 trace_9p_protocol_dump(clnt, req->rc);
2225                 goto error;
2226         }
2227         P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2228 error:
2229         p9_free_req(clnt, req);
2230         return err;
2231 }
2232 EXPORT_SYMBOL(p9_client_readlink);