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 /*
  42   * Client Option Parsing (code inspired by NFS code)
  43   *  - a little lazy - parse all client options
  44   */
  45
  46 enum {
  47         Opt_msize,
  48         Opt_trans,
  49         Opt_legacy,
  50         Opt_version,
  51         Opt_err,
  52 };
  53
  54 static const match_table_t tokens = {
  55         {Opt_msize, "msize=%u"},
  56         {Opt_legacy, "noextend"},
  57         {Opt_trans, "trans=%s"},
  58         {Opt_version, "version=%s"},
  59         {Opt_err, NULL},
  60 };
  61
  62 inline int p9_is_proto_dotl(struct p9_client *clnt)
  63 {
  64         return clnt->proto_version == p9_proto_2000L;
  65 }
  66 EXPORT_SYMBOL(p9_is_proto_dotl);
  67
  68 inline int p9_is_proto_dotu(struct p9_client *clnt)
  69 {
  70         return clnt->proto_version == p9_proto_2000u;
  71 }
  72 EXPORT_SYMBOL(p9_is_proto_dotu);
  73
  74 /* Interpret mount option for protocol version */
  75 static int get_protocol_version(char *s)
  76 {
  77         int version = -EINVAL;
  78
  79         if (!strcmp(s, "9p2000")) {
  80                 version = p9_proto_legacy;
  81                 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
  82         } else if (!strcmp(s, "9p2000.u")) {
  83                 version = p9_proto_2000u;
  84                 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
  85         } else if (!strcmp(s, "9p2000.L")) {
  86                 version = p9_proto_2000L;
  87                 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
  88         } else
  89                 printk(KERN_INFO "9p: Unknown protocol version %s.\n", s);
  90
  91         return version;
  92 }
  93
  94 /**
  95  * parse_options - parse mount options into client structure
  96  * @opts: options string passed from mount
  97  * @clnt: existing v9fs client information
  98  *
  99  * Return 0 upon success, -ERRNO upon failure
 100  */
 101
 102 static int parse_opts(char *opts, struct p9_client *clnt)
 103 {
 104         char *options, *tmp_options;
 105         char *p;
 106         substring_t args[MAX_OPT_ARGS];
 107         int option;
 108         char *s;
 109         int ret = 0;
 110
 111         clnt->proto_version = p9_proto_2000u;
 112         clnt->msize = 8192;
 113
 114         if (!opts)
 115                 return 0;
 116
 117         tmp_options = kstrdup(opts, GFP_KERNEL);
 118         if (!tmp_options) {
 119                 P9_DPRINTK(P9_DEBUG_ERROR,
 120                                 "failed to allocate copy of option string\n");
 121                 return -ENOMEM;
 122         }
 123         options = tmp_options;
 124
 125         while ((p = strsep(&options, ",")) != NULL) {
 126                 int token;
 127                 if (!*p)
 128                         continue;
 129                 token = match_token(p, tokens, args);
 130                 if (token < Opt_trans) {
 131                         int r = match_int(&args[0], &option);
 132                         if (r < 0) {
 133                                 P9_DPRINTK(P9_DEBUG_ERROR,
 134                                         "integer field, but no integer?\n");
 135                                 ret = r;
 136                                 continue;
 137                         }
 138                 }
 139                 switch (token) {
 140                 case Opt_msize:
 141                         clnt->msize = option;
 142                         break;
 143                 case Opt_trans:
 144                         s = match_strdup(&args[0]);
 145                         if (!s) {
 146                                 ret = -ENOMEM;
 147                                 P9_DPRINTK(P9_DEBUG_ERROR,
 148                                         "problem allocating copy of trans arg\n");
 149                                 goto free_and_return;
 150                          }
 151                         clnt->trans_mod = v9fs_get_trans_by_name(s);
 152                         if (clnt->trans_mod == NULL) {
 153                                 printk(KERN_INFO
 154                                         "9p: Could not find "
 155                                         "request transport: %s\n", s);
 156                                 ret = -EINVAL;
 157                                 kfree(s);
 158                                 goto free_and_return;
 159                         }
 160                         kfree(s);
 161                         break;
 162                 case Opt_legacy:
 163                         clnt->proto_version = p9_proto_legacy;
 164                         break;
 165                 case Opt_version:
 166                         s = match_strdup(&args[0]);
 167                         if (!s) {
 168                                 ret = -ENOMEM;
 169                                 P9_DPRINTK(P9_DEBUG_ERROR,
 170                                         "problem allocating copy of version arg\n");
 171                                 goto free_and_return;
 172                         }
 173                         ret = get_protocol_version(s);
 174                         if (ret == -EINVAL) {
 175                                 kfree(s);
 176                                 goto free_and_return;
 177                         }
 178                         kfree(s);
 179                         clnt->proto_version = ret;
 180                         break;
 181                 default:
 182                         continue;
 183                 }
 184         }
 185
 186 free_and_return:
 187         kfree(tmp_options);
 188         return ret;
 189 }
 190
 191 /**
 192  * p9_tag_alloc - lookup/allocate a request by tag
 193  * @c: client session to lookup tag within
 194  * @tag: numeric id for transaction
 195  *
 196  * this is a simple array lookup, but will grow the
 197  * request_slots as necessary to accommodate transaction
 198  * ids which did not previously have a slot.
 199  *
 200  * this code relies on the client spinlock to manage locks, its
 201  * possible we should switch to something else, but I'd rather
 202  * stick with something low-overhead for the common case.
 203  *
 204  */
 205
 206 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag, int max_size)
 207 {
 208         unsigned long flags;
 209         int row, col;
 210         struct p9_req_t *req;
 211         int alloc_msize = min(c->msize, max_size);
 212
 213         /* This looks up the original request by tag so we know which
 214          * buffer to read the data into */
 215         tag++;
 216
 217         if (tag >= c->max_tag) {
 218                 spin_lock_irqsave(&c->lock, flags);
 219                 /* check again since original check was outside of lock */
 220                 while (tag >= c->max_tag) {
 221                         row = (tag / P9_ROW_MAXTAG);
 222                         c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
 223                                         sizeof(struct p9_req_t), GFP_ATOMIC);
 224
 225                         if (!c->reqs[row]) {
 226                                 printk(KERN_ERR "Couldn't grow tag array\n");
 227                                 spin_unlock_irqrestore(&c->lock, flags);
 228                                 return ERR_PTR(-ENOMEM);
 229                         }
 230                         for (col = 0; col < P9_ROW_MAXTAG; col++) {
 231                                 c->reqs[row][col].status = REQ_STATUS_IDLE;
 232                                 c->reqs[row][col].tc = NULL;
 233                         }
 234                         c->max_tag += P9_ROW_MAXTAG;
 235                 }
 236                 spin_unlock_irqrestore(&c->lock, flags);
 237         }
 238         row = tag / P9_ROW_MAXTAG;
 239         col = tag % P9_ROW_MAXTAG;
 240
 241         req = &c->reqs[row][col];
 242         if (!req->tc) {
 243                 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
 244                 if (!req->wq) {
 245                         printk(KERN_ERR "Couldn't grow tag array\n");
 246                         return ERR_PTR(-ENOMEM);
 247                 }
 248                 init_waitqueue_head(req->wq);
 249                 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
 250                                   GFP_NOFS);
 251                 req->tc->capacity = alloc_msize;
 252                 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
 253                                   GFP_NOFS);
 254                 req->rc->capacity = alloc_msize;
 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->sdata = (char *) req->tc + sizeof(struct p9_fcall);
 265                 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
 266         }
 267
 268         p9pdu_reset(req->tc);
 269         p9pdu_reset(req->rc);
 270
 271         req->tc->tag = tag-1;
 272         req->status = REQ_STATUS_ALLOC;
 273
 274         return &c->reqs[row][col];
 275 }
 276
 277 /**
 278  * p9_tag_lookup - lookup a request by tag
 279  * @c: client session to lookup tag within
 280  * @tag: numeric id for transaction
 281  *
 282  */
 283
 284 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
 285 {
 286         int row, col;
 287
 288         /* This looks up the original request by tag so we know which
 289          * buffer to read the data into */
 290         tag++;
 291
 292         if(tag >= c->max_tag)
 293                 return NULL;
 294
 295         row = tag / P9_ROW_MAXTAG;
 296         col = tag % P9_ROW_MAXTAG;
 297
 298         return &c->reqs[row][col];
 299 }
 300 EXPORT_SYMBOL(p9_tag_lookup);
 301
 302 /**
 303  * p9_tag_init - setup tags structure and contents
 304  * @c:  v9fs client struct
 305  *
 306  * This initializes the tags structure for each client instance.
 307  *
 308  */
 309
 310 static int p9_tag_init(struct p9_client *c)
 311 {
 312         int err = 0;
 313
 314         c->tagpool = p9_idpool_create();
 315         if (IS_ERR(c->tagpool)) {
 316                 err = PTR_ERR(c->tagpool);
 317                 goto error;
 318         }
 319         err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
 320         if (err < 0) {
 321                 p9_idpool_destroy(c->tagpool);
 322                 goto error;
 323         }
 324         c->max_tag = 0;
 325 error:
 326         return err;
 327 }
 328
 329 /**
 330  * p9_tag_cleanup - cleans up tags structure and reclaims resources
 331  * @c:  v9fs client struct
 332  *
 333  * This frees resources associated with the tags structure
 334  *
 335  */
 336 static void p9_tag_cleanup(struct p9_client *c)
 337 {
 338         int row, col;
 339
 340         /* check to insure all requests are idle */
 341         for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
 342                 for (col = 0; col < P9_ROW_MAXTAG; col++) {
 343                         if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
 344                                 P9_DPRINTK(P9_DEBUG_MUX,
 345                                   "Attempting to cleanup non-free tag %d,%d\n",
 346                                   row, col);
 347                                 /* TODO: delay execution of cleanup */
 348                                 return;
 349                         }
 350                 }
 351         }
 352
 353         if (c->tagpool) {
 354                 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
 355                 p9_idpool_destroy(c->tagpool);
 356         }
 357
 358         /* free requests associated with tags */
 359         for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
 360                 for (col = 0; col < P9_ROW_MAXTAG; col++) {
 361                         kfree(c->reqs[row][col].wq);
 362                         kfree(c->reqs[row][col].tc);
 363                         kfree(c->reqs[row][col].rc);
 364                 }
 365                 kfree(c->reqs[row]);
 366         }
 367         c->max_tag = 0;
 368 }
 369
 370 /**
 371  * p9_free_req - free a request and clean-up as necessary
 372  * c: client state
 373  * r: request to release
 374  *
 375  */
 376
 377 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
 378 {
 379         int tag = r->tc->tag;
 380         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
 381
 382         r->status = REQ_STATUS_IDLE;
 383         if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
 384                 p9_idpool_put(tag, c->tagpool);
 385 }
 386
 387 /**
 388  * p9_client_cb - call back from transport to client
 389  * c: client state
 390  * req: request received
 391  *
 392  */
 393 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
 394 {
 395         P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
 396         wake_up(req->wq);
 397         P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
 398 }
 399 EXPORT_SYMBOL(p9_client_cb);
 400
 401 /**
 402  * p9_parse_header - parse header arguments out of a packet
 403  * @pdu: packet to parse
 404  * @size: size of packet
 405  * @type: type of request
 406  * @tag: tag of packet
 407  * @rewind: set if we need to rewind offset afterwards
 408  */
 409
 410 int
 411 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
 412                                                                 int rewind)
 413 {
 414         int8_t r_type;
 415         int16_t r_tag;
 416         int32_t r_size;
 417         int offset = pdu->offset;
 418         int err;
 419
 420         pdu->offset = 0;
 421         if (pdu->size == 0)
 422                 pdu->size = 7;
 423
 424         err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
 425         if (err)
 426                 goto rewind_and_exit;
 427
 428         pdu->size = r_size;
 429         pdu->id = r_type;
 430         pdu->tag = r_tag;
 431
 432         P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
 433                                                         pdu->id, pdu->tag);
 434
 435         if (type)
 436                 *type = r_type;
 437         if (tag)
 438                 *tag = r_tag;
 439         if (size)
 440                 *size = r_size;
 441
 442
 443 rewind_and_exit:
 444         if (rewind)
 445                 pdu->offset = offset;
 446         return err;
 447 }
 448 EXPORT_SYMBOL(p9_parse_header);
 449
 450 /**
 451  * p9_check_errors - check 9p packet for error return and process it
 452  * @c: current client instance
 453  * @req: request to parse and check for error conditions
 454  *
 455  * returns error code if one is discovered, otherwise returns 0
 456  *
 457  * this will have to be more complicated if we have multiple
 458  * error packet types
 459  */
 460
 461 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
 462 {
 463         int8_t type;
 464         int err;
 465         int ecode;
 466
 467         err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
 468         if (err) {
 469                 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
 470                 return err;
 471         }
 472
 473         if (type != P9_RERROR && type != P9_RLERROR)
 474                 return 0;
 475
 476         if (!p9_is_proto_dotl(c)) {
 477                 char *ename;
 478                 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
 479                                   &ename, &ecode);
 480                 if (err)
 481                         goto out_err;
 482
 483                 if (p9_is_proto_dotu(c))
 484                         err = -ecode;
 485
 486                 if (!err || !IS_ERR_VALUE(err)) {
 487                         err = p9_errstr2errno(ename, strlen(ename));
 488
 489                         P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
 490                                    -ecode, ename);
 491                 }
 492                 kfree(ename);
 493         } else {
 494                 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
 495                 err = -ecode;
 496
 497                 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
 498         }
 499
 500         return err;
 501
 502 out_err:
 503         P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
 504
 505         return err;
 506 }
 507
 508 /**
 509  * p9_check_zc_errors - check 9p packet for error return and process it
 510  * @c: current client instance
 511  * @req: request to parse and check for error conditions
 512  * @in_hdrlen: Size of response protocol buffer.
 513  *
 514  * returns error code if one is discovered, otherwise returns 0
 515  *
 516  * this will have to be more complicated if we have multiple
 517  * error packet types
 518  */
 519
 520 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
 521                               char *uidata, int in_hdrlen, int kern_buf)
 522 {
 523         int err;
 524         int ecode;
 525         int8_t type;
 526         char *ename = NULL;
 527
 528         err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
 529         if (err) {
 530                 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
 531                 return err;
 532         }
 533
 534         if (type != P9_RERROR && type != P9_RLERROR)
 535                 return 0;
 536
 537         if (!p9_is_proto_dotl(c)) {
 538                 /* Error is reported in string format */
 539                 uint16_t len;
 540                 /* 7 = header size for RERROR, 2 is the size of string len; */
 541                 int inline_len = in_hdrlen - (7 + 2);
 542
 543                 /* Read the size of error string */
 544                 err = p9pdu_readf(req->rc, c->proto_version, "w", &len);
 545                 if (err)
 546                         goto out_err;
 547
 548                 ename = kmalloc(len + 1, GFP_NOFS);
 549                 if (!ename) {
 550                         err = -ENOMEM;
 551                         goto out_err;
 552                 }
 553                 if (len <= inline_len) {
 554                         /* We have error in protocol buffer itself */
 555                         if (pdu_read(req->rc, ename, len)) {
 556                                 err = -EFAULT;
 557                                 goto out_free;
 558
 559                         }
 560                 } else {
 561                         /*
 562                          *  Part of the data is in user space buffer.
 563                          */
 564                         if (pdu_read(req->rc, ename, inline_len)) {
 565                                 err = -EFAULT;
 566                                 goto out_free;
 567
 568                         }
 569                         if (kern_buf) {
 570                                 memcpy(ename + inline_len, uidata,
 571                                        len - inline_len);
 572                         } else {
 573                                 err = copy_from_user(ename + inline_len,
 574                                                      uidata, len - inline_len);
 575                                 if (err) {
 576                                         err = -EFAULT;
 577                                         goto out_free;
 578                                 }
 579                         }
 580                 }
 581                 ename[len] = 0;
 582                 if (p9_is_proto_dotu(c)) {
 583                         /* For dotu we also have error code */
 584                         err = p9pdu_readf(req->rc,
 585                                           c->proto_version, "d", &ecode);
 586                         if (err)
 587                                 goto out_free;
 588                         err = -ecode;
 589                 }
 590                 if (!err || !IS_ERR_VALUE(err)) {
 591                         err = p9_errstr2errno(ename, strlen(ename));
 592
 593                         P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
 594                                    -ecode, ename);
 595                 }
 596                 kfree(ename);
 597         } else {
 598                 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
 599                 err = -ecode;
 600
 601                 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
 602         }
 603         return err;
 604
 605 out_free:
 606         kfree(ename);
 607 out_err:
 608         P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
 609         return err;
 610 }
 611
 612 static struct p9_req_t *
 613 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
 614
 615 /**
 616  * p9_client_flush - flush (cancel) a request
 617  * @c: client state
 618  * @oldreq: request to cancel
 619  *
 620  * This sents a flush for a particular request and links
 621  * the flush request to the original request.  The current
 622  * code only supports a single flush request although the protocol
 623  * allows for multiple flush requests to be sent for a single request.
 624  *
 625  */
 626
 627 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
 628 {
 629         struct p9_req_t *req;
 630         int16_t oldtag;
 631         int err;
 632
 633         err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
 634         if (err)
 635                 return err;
 636
 637         P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
 638
 639         req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
 640         if (IS_ERR(req))
 641                 return PTR_ERR(req);
 642
 643
 644         /* if we haven't received a response for oldreq,
 645            remove it from the list. */
 646         spin_lock(&c->lock);
 647         if (oldreq->status == REQ_STATUS_FLSH)
 648                 list_del(&oldreq->req_list);
 649         spin_unlock(&c->lock);
 650
 651         p9_free_req(c, req);
 652         return 0;
 653 }
 654
 655 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
 656                                               int8_t type, int req_size,
 657                                               const char *fmt, va_list ap)
 658 {
 659         int tag, err;
 660         struct p9_req_t *req;
 661
 662         P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
 663
 664         /* we allow for any status other than disconnected */
 665         if (c->status == Disconnected)
 666                 return ERR_PTR(-EIO);
 667
 668         /* if status is begin_disconnected we allow only clunk request */
 669         if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
 670                 return ERR_PTR(-EIO);
 671
 672         tag = P9_NOTAG;
 673         if (type != P9_TVERSION) {
 674                 tag = p9_idpool_get(c->tagpool);
 675                 if (tag < 0)
 676                         return ERR_PTR(-ENOMEM);
 677         }
 678
 679         req = p9_tag_alloc(c, tag, req_size);
 680         if (IS_ERR(req))
 681                 return req;
 682
 683         /* marshall the data */
 684         p9pdu_prepare(req->tc, tag, type);
 685         err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
 686         if (err)
 687                 goto reterr;
 688         p9pdu_finalize(req->tc);
 689         return req;
 690 reterr:
 691         p9_free_req(c, req);
 692         return ERR_PTR(err);
 693 }
 694
 695 /**
 696  * p9_client_rpc - issue a request and wait for a response
 697  * @c: client session
 698  * @type: type of request
 699  * @fmt: protocol format string (see protocol.c)
 700  *
 701  * Returns request structure (which client must free using p9_free_req)
 702  */
 703
 704 static struct p9_req_t *
 705 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
 706 {
 707         va_list ap;
 708         int sigpending, err;
 709         unsigned long flags;
 710         struct p9_req_t *req;
 711
 712         va_start(ap, fmt);
 713         req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
 714         va_end(ap);
 715         if (IS_ERR(req))
 716                 return req;
 717
 718         if (signal_pending(current)) {
 719                 sigpending = 1;
 720                 clear_thread_flag(TIF_SIGPENDING);
 721         } else
 722                 sigpending = 0;
 723
 724         err = c->trans_mod->request(c, req);
 725         if (err < 0) {
 726                 if (err != -ERESTARTSYS && err != -EFAULT)
 727                         c->status = Disconnected;
 728                 goto reterr;
 729         }
 730         /* Wait for the response */
 731         err = wait_event_interruptible(*req->wq,
 732                                        req->status >= REQ_STATUS_RCVD);
 733
 734         if (req->status == REQ_STATUS_ERROR) {
 735                 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
 736                 err = req->t_err;
 737         }
 738         if ((err == -ERESTARTSYS) && (c->status == Connected)) {
 739                 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
 740                 sigpending = 1;
 741                 clear_thread_flag(TIF_SIGPENDING);
 742
 743                 if (c->trans_mod->cancel(c, req))
 744                         p9_client_flush(c, req);
 745
 746                 /* if we received the response anyway, don't signal error */
 747                 if (req->status == REQ_STATUS_RCVD)
 748                         err = 0;
 749         }
 750         if (sigpending) {
 751                 spin_lock_irqsave(&current->sighand->siglock, flags);
 752                 recalc_sigpending();
 753                 spin_unlock_irqrestore(&current->sighand->siglock, flags);
 754         }
 755         if (err < 0)
 756                 goto reterr;
 757
 758         err = p9_check_errors(c, req);
 759         if (!err) {
 760                 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
 761                 return req;
 762         }
 763 reterr:
 764         P9_DPRINTK(P9_DEBUG_MUX,
 765                    "exit: client %p op %d error: %d\n", c, type, err);
 766         p9_free_req(c, req);
 767         return ERR_PTR(err);
 768 }
 769
 770 /**
 771  * p9_client_zc_rpc - issue a request and wait for a response
 772  * @c: client session
 773  * @type: type of request
 774  * @uidata: user bffer that should be ued for zero copy read
 775  * @uodata: user buffer that shoud be user for zero copy write
 776  * @inlen: read buffer size
 777  * @olen: write buffer size
 778  * @hdrlen: reader header size, This is the size of response protocol data
 779  * @fmt: protocol format string (see protocol.c)
 780  *
 781  * Returns request structure (which client must free using p9_free_req)
 782  */
 783 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
 784                                          char *uidata, char *uodata,
 785                                          int inlen, int olen, int in_hdrlen,
 786                                          int kern_buf, const char *fmt, ...)
 787 {
 788         va_list ap;
 789         int sigpending, err;
 790         unsigned long flags;
 791         struct p9_req_t *req;
 792
 793         va_start(ap, fmt);
 794         /*
 795          * We allocate a inline protocol data of only 4k bytes.
 796          * The actual content is passed in zero-copy fashion.
 797          */
 798         req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
 799         va_end(ap);
 800         if (IS_ERR(req))
 801                 return req;
 802
 803         if (signal_pending(current)) {
 804                 sigpending = 1;
 805                 clear_thread_flag(TIF_SIGPENDING);
 806         } else
 807                 sigpending = 0;
 808
 809         /* If we are called with KERNEL_DS force kern_buf */
 810         if (segment_eq(get_fs(), KERNEL_DS))
 811                 kern_buf = 1;
 812
 813         err = c->trans_mod->zc_request(c, req, uidata, uodata,
 814                                        inlen, olen, in_hdrlen, kern_buf);
 815         if (err < 0) {
 816                 if (err == -EIO)
 817                         c->status = Disconnected;
 818                 goto reterr;
 819         }
 820         if (req->status == REQ_STATUS_ERROR) {
 821                 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
 822                 err = req->t_err;
 823         }
 824         if ((err == -ERESTARTSYS) && (c->status == Connected)) {
 825                 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
 826                 sigpending = 1;
 827                 clear_thread_flag(TIF_SIGPENDING);
 828
 829                 if (c->trans_mod->cancel(c, req))
 830                         p9_client_flush(c, req);
 831
 832                 /* if we received the response anyway, don't signal error */
 833                 if (req->status == REQ_STATUS_RCVD)
 834                         err = 0;
 835         }
 836         if (sigpending) {
 837                 spin_lock_irqsave(&current->sighand->siglock, flags);
 838                 recalc_sigpending();
 839                 spin_unlock_irqrestore(&current->sighand->siglock, flags);
 840         }
 841         if (err < 0)
 842                 goto reterr;
 843
 844         err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
 845         if (!err) {
 846                 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
 847                 return req;
 848         }
 849 reterr:
 850         P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
 851                                                                         err);
 852         p9_free_req(c, req);
 853         return ERR_PTR(err);
 854 }
 855
 856 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
 857 {
 858         int ret;
 859         struct p9_fid *fid;
 860         unsigned long flags;
 861
 862         P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
 863         fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
 864         if (!fid)
 865                 return ERR_PTR(-ENOMEM);
 866
 867         ret = p9_idpool_get(clnt->fidpool);
 868         if (ret < 0) {
 869                 ret = -ENOSPC;
 870                 goto error;
 871         }
 872         fid->fid = ret;
 873
 874         memset(&fid->qid, 0, sizeof(struct p9_qid));
 875         fid->mode = -1;
 876         fid->uid = current_fsuid();
 877         fid->clnt = clnt;
 878         fid->rdir = NULL;
 879         spin_lock_irqsave(&clnt->lock, flags);
 880         list_add(&fid->flist, &clnt->fidlist);
 881         spin_unlock_irqrestore(&clnt->lock, flags);
 882
 883         return fid;
 884
 885 error:
 886         kfree(fid);
 887         return ERR_PTR(ret);
 888 }
 889
 890 static void p9_fid_destroy(struct p9_fid *fid)
 891 {
 892         struct p9_client *clnt;
 893         unsigned long flags;
 894
 895         P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
 896         clnt = fid->clnt;
 897         p9_idpool_put(fid->fid, clnt->fidpool);
 898         spin_lock_irqsave(&clnt->lock, flags);
 899         list_del(&fid->flist);
 900         spin_unlock_irqrestore(&clnt->lock, flags);
 901         kfree(fid->rdir);
 902         kfree(fid);
 903 }
 904
 905 static int p9_client_version(struct p9_client *c)
 906 {
 907         int err = 0;
 908         struct p9_req_t *req;
 909         char *version;
 910         int msize;
 911
 912         P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
 913                                                 c->msize, c->proto_version);
 914
 915         switch (c->proto_version) {
 916         case p9_proto_2000L:
 917                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 918                                         c->msize, "9P2000.L");
 919                 break;
 920         case p9_proto_2000u:
 921                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 922                                         c->msize, "9P2000.u");
 923                 break;
 924         case p9_proto_legacy:
 925                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 926                                         c->msize, "9P2000");
 927                 break;
 928         default:
 929                 return -EINVAL;
 930                 break;
 931         }
 932
 933         if (IS_ERR(req))
 934                 return PTR_ERR(req);
 935
 936         err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
 937         if (err) {
 938                 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
 939                 P9_DUMP_PKT(1, req->rc);
 940                 goto error;
 941         }
 942
 943         P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
 944         if (!strncmp(version, "9P2000.L", 8))
 945                 c->proto_version = p9_proto_2000L;
 946         else if (!strncmp(version, "9P2000.u", 8))
 947                 c->proto_version = p9_proto_2000u;
 948         else if (!strncmp(version, "9P2000", 6))
 949                 c->proto_version = p9_proto_legacy;
 950         else {
 951                 err = -EREMOTEIO;
 952                 goto error;
 953         }
 954
 955         if (msize < c->msize)
 956                 c->msize = msize;
 957
 958 error:
 959         kfree(version);
 960         p9_free_req(c, req);
 961
 962         return err;
 963 }
 964
 965 struct p9_client *p9_client_create(const char *dev_name, char *options)
 966 {
 967         int err;
 968         struct p9_client *clnt;
 969
 970         err = 0;
 971         clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
 972         if (!clnt)
 973                 return ERR_PTR(-ENOMEM);
 974
 975         clnt->trans_mod = NULL;
 976         clnt->trans = NULL;
 977         spin_lock_init(&clnt->lock);
 978         INIT_LIST_HEAD(&clnt->fidlist);
 979
 980         err = p9_tag_init(clnt);
 981         if (err < 0)
 982                 goto free_client;
 983
 984         err = parse_opts(options, clnt);
 985         if (err < 0)
 986                 goto destroy_tagpool;
 987
 988         if (!clnt->trans_mod)
 989                 clnt->trans_mod = v9fs_get_default_trans();
 990
 991         if (clnt->trans_mod == NULL) {
 992                 err = -EPROTONOSUPPORT;
 993                 P9_DPRINTK(P9_DEBUG_ERROR,
 994                                 "No transport defined or default transport\n");
 995                 goto destroy_tagpool;
 996         }
 997
 998         clnt->fidpool = p9_idpool_create();
 999         if (IS_ERR(clnt->fidpool)) {
1000                 err = PTR_ERR(clnt->fidpool);
1001                 goto put_trans;
1002         }
1003
1004         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1005                 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1006
1007         err = clnt->trans_mod->create(clnt, dev_name, options);
1008         if (err)
1009                 goto destroy_fidpool;
1010
1011         if (clnt->msize > clnt->trans_mod->maxsize)
1012                 clnt->msize = clnt->trans_mod->maxsize;
1013
1014         err = p9_client_version(clnt);
1015         if (err)
1016                 goto close_trans;
1017
1018         return clnt;
1019
1020 close_trans:
1021         clnt->trans_mod->close(clnt);
1022 destroy_fidpool:
1023         p9_idpool_destroy(clnt->fidpool);
1024 put_trans:
1025         v9fs_put_trans(clnt->trans_mod);
1026 destroy_tagpool:
1027         p9_idpool_destroy(clnt->tagpool);
1028 free_client:
1029         kfree(clnt);
1030         return ERR_PTR(err);
1031 }
1032 EXPORT_SYMBOL(p9_client_create);
1033
1034 void p9_client_destroy(struct p9_client *clnt)
1035 {
1036         struct p9_fid *fid, *fidptr;
1037
1038         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
1039
1040         if (clnt->trans_mod)
1041                 clnt->trans_mod->close(clnt);
1042
1043         v9fs_put_trans(clnt->trans_mod);
1044
1045         list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1046                 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
1047                 p9_fid_destroy(fid);
1048         }
1049
1050         if (clnt->fidpool)
1051                 p9_idpool_destroy(clnt->fidpool);
1052
1053         p9_tag_cleanup(clnt);
1054
1055         kfree(clnt);
1056 }
1057 EXPORT_SYMBOL(p9_client_destroy);
1058
1059 void p9_client_disconnect(struct p9_client *clnt)
1060 {
1061         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
1062         clnt->status = Disconnected;
1063 }
1064 EXPORT_SYMBOL(p9_client_disconnect);
1065
1066 void p9_client_begin_disconnect(struct p9_client *clnt)
1067 {
1068         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
1069         clnt->status = BeginDisconnect;
1070 }
1071 EXPORT_SYMBOL(p9_client_begin_disconnect);
1072
1073 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1074         char *uname, u32 n_uname, char *aname)
1075 {
1076         int err;
1077         struct p9_req_t *req;
1078         struct p9_fid *fid;
1079         struct p9_qid qid;
1080
1081         P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1082                                         afid ? afid->fid : -1, uname, aname);
1083         err = 0;
1084
1085         fid = p9_fid_create(clnt);
1086         if (IS_ERR(fid)) {
1087                 err = PTR_ERR(fid);
1088                 fid = NULL;
1089                 goto error;
1090         }
1091
1092         req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
1093                         afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1094         if (IS_ERR(req)) {
1095                 err = PTR_ERR(req);
1096                 goto error;
1097         }
1098
1099         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1100         if (err) {
1101                 P9_DUMP_PKT(1, req->rc);
1102                 p9_free_req(clnt, req);
1103                 goto error;
1104         }
1105
1106         P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1107                                         qid.type,
1108                                         (unsigned long long)qid.path,
1109                                         qid.version);
1110
1111         memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1112
1113         p9_free_req(clnt, req);
1114         return fid;
1115
1116 error:
1117         if (fid)
1118                 p9_fid_destroy(fid);
1119         return ERR_PTR(err);
1120 }
1121 EXPORT_SYMBOL(p9_client_attach);
1122
1123 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1124                 char **wnames, int clone)
1125 {
1126         int err;
1127         struct p9_client *clnt;
1128         struct p9_fid *fid;
1129         struct p9_qid *wqids;
1130         struct p9_req_t *req;
1131         uint16_t nwqids, count;
1132
1133         err = 0;
1134         wqids = NULL;
1135         clnt = oldfid->clnt;
1136         if (clone) {
1137                 fid = p9_fid_create(clnt);
1138                 if (IS_ERR(fid)) {
1139                         err = PTR_ERR(fid);
1140                         fid = NULL;
1141                         goto error;
1142                 }
1143
1144                 fid->uid = oldfid->uid;
1145         } else
1146                 fid = oldfid;
1147
1148
1149         P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1150                 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1151
1152         req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1153                                                                 nwname, wnames);
1154         if (IS_ERR(req)) {
1155                 err = PTR_ERR(req);
1156                 goto error;
1157         }
1158
1159         err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1160         if (err) {
1161                 P9_DUMP_PKT(1, req->rc);
1162                 p9_free_req(clnt, req);
1163                 goto clunk_fid;
1164         }
1165         p9_free_req(clnt, req);
1166
1167         P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1168
1169         if (nwqids != nwname) {
1170                 err = -ENOENT;
1171                 goto clunk_fid;
1172         }
1173
1174         for (count = 0; count < nwqids; count++)
1175                 P9_DPRINTK(P9_DEBUG_9P, "<<<     [%d] %x.%llx.%x\n",
1176                         count, wqids[count].type,
1177                         (unsigned long long)wqids[count].path,
1178                         wqids[count].version);
1179
1180         if (nwname)
1181                 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1182         else
1183                 fid->qid = oldfid->qid;
1184
1185         kfree(wqids);
1186         return fid;
1187
1188 clunk_fid:
1189         kfree(wqids);
1190         p9_client_clunk(fid);
1191         fid = NULL;
1192
1193 error:
1194         if (fid && (fid != oldfid))
1195                 p9_fid_destroy(fid);
1196
1197         return ERR_PTR(err);
1198 }
1199 EXPORT_SYMBOL(p9_client_walk);
1200
1201 int p9_client_open(struct p9_fid *fid, int mode)
1202 {
1203         int err;
1204         struct p9_client *clnt;
1205         struct p9_req_t *req;
1206         struct p9_qid qid;
1207         int iounit;
1208
1209         clnt = fid->clnt;
1210         P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1211                 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1212         err = 0;
1213
1214         if (fid->mode != -1)
1215                 return -EINVAL;
1216
1217         if (p9_is_proto_dotl(clnt))
1218                 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1219         else
1220                 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1221         if (IS_ERR(req)) {
1222                 err = PTR_ERR(req);
1223                 goto error;
1224         }
1225
1226         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1227         if (err) {
1228                 P9_DUMP_PKT(1, req->rc);
1229                 goto free_and_error;
1230         }
1231
1232         P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1233                 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN",  qid.type,
1234                 (unsigned long long)qid.path, qid.version, iounit);
1235
1236         fid->mode = mode;
1237         fid->iounit = iounit;
1238
1239 free_and_error:
1240         p9_free_req(clnt, req);
1241 error:
1242         return err;
1243 }
1244 EXPORT_SYMBOL(p9_client_open);
1245
1246 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1247                 gid_t gid, struct p9_qid *qid)
1248 {
1249         int err = 0;
1250         struct p9_client *clnt;
1251         struct p9_req_t *req;
1252         int iounit;
1253
1254         P9_DPRINTK(P9_DEBUG_9P,
1255                         ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1256                         ofid->fid, name, flags, mode, gid);
1257         clnt = ofid->clnt;
1258
1259         if (ofid->mode != -1)
1260                 return -EINVAL;
1261
1262         req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1263                         mode, gid);
1264         if (IS_ERR(req)) {
1265                 err = PTR_ERR(req);
1266                 goto error;
1267         }
1268
1269         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1270         if (err) {
1271                 P9_DUMP_PKT(1, req->rc);
1272                 goto free_and_error;
1273         }
1274
1275         P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1276                         qid->type,
1277                         (unsigned long long)qid->path,
1278                         qid->version, iounit);
1279
1280         ofid->mode = mode;
1281         ofid->iounit = iounit;
1282
1283 free_and_error:
1284         p9_free_req(clnt, req);
1285 error:
1286         return err;
1287 }
1288 EXPORT_SYMBOL(p9_client_create_dotl);
1289
1290 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1291                      char *extension)
1292 {
1293         int err;
1294         struct p9_client *clnt;
1295         struct p9_req_t *req;
1296         struct p9_qid qid;
1297         int iounit;
1298
1299         P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1300                                                 fid->fid, name, perm, mode);
1301         err = 0;
1302         clnt = fid->clnt;
1303
1304         if (fid->mode != -1)
1305                 return -EINVAL;
1306
1307         req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1308                                 mode, extension);
1309         if (IS_ERR(req)) {
1310                 err = PTR_ERR(req);
1311                 goto error;
1312         }
1313
1314         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1315         if (err) {
1316                 P9_DUMP_PKT(1, req->rc);
1317                 goto free_and_error;
1318         }
1319
1320         P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1321                                 qid.type,
1322                                 (unsigned long long)qid.path,
1323                                 qid.version, iounit);
1324
1325         fid->mode = mode;
1326         fid->iounit = iounit;
1327
1328 free_and_error:
1329         p9_free_req(clnt, req);
1330 error:
1331         return err;
1332 }
1333 EXPORT_SYMBOL(p9_client_fcreate);
1334
1335 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1336                 struct p9_qid *qid)
1337 {
1338         int err = 0;
1339         struct p9_client *clnt;
1340         struct p9_req_t *req;
1341
1342         P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s  symtgt %s\n",
1343                         dfid->fid, name, symtgt);
1344         clnt = dfid->clnt;
1345
1346         req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1347                         gid);
1348         if (IS_ERR(req)) {
1349                 err = PTR_ERR(req);
1350                 goto error;
1351         }
1352
1353         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1354         if (err) {
1355                 P9_DUMP_PKT(1, req->rc);
1356                 goto free_and_error;
1357         }
1358
1359         P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1360                         qid->type, (unsigned long long)qid->path, qid->version);
1361
1362 free_and_error:
1363         p9_free_req(clnt, req);
1364 error:
1365         return err;
1366 }
1367 EXPORT_SYMBOL(p9_client_symlink);
1368
1369 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1370 {
1371         struct p9_client *clnt;
1372         struct p9_req_t *req;
1373
1374         P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1375                         dfid->fid, oldfid->fid, newname);
1376         clnt = dfid->clnt;
1377         req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1378                         newname);
1379         if (IS_ERR(req))
1380                 return PTR_ERR(req);
1381
1382         P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1383         p9_free_req(clnt, req);
1384         return 0;
1385 }
1386 EXPORT_SYMBOL(p9_client_link);
1387
1388 int p9_client_fsync(struct p9_fid *fid, int datasync)
1389 {
1390         int err;
1391         struct p9_client *clnt;
1392         struct p9_req_t *req;
1393
1394         P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1395                         fid->fid, datasync);
1396         err = 0;
1397         clnt = fid->clnt;
1398
1399         req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1400         if (IS_ERR(req)) {
1401                 err = PTR_ERR(req);
1402                 goto error;
1403         }
1404
1405         P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1406
1407         p9_free_req(clnt, req);
1408
1409 error:
1410         return err;
1411 }
1412 EXPORT_SYMBOL(p9_client_fsync);
1413
1414 int p9_client_clunk(struct p9_fid *fid)
1415 {
1416         int err;
1417         struct p9_client *clnt;
1418         struct p9_req_t *req;
1419
1420         if (!fid) {
1421                 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1422                 dump_stack();
1423                 return 0;
1424         }
1425
1426         P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1427         err = 0;
1428         clnt = fid->clnt;
1429
1430         req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1431         if (IS_ERR(req)) {
1432                 err = PTR_ERR(req);
1433                 goto error;
1434         }
1435
1436         P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1437
1438         p9_free_req(clnt, req);
1439 error:
1440         /*
1441          * Fid is not valid even after a failed clunk
1442          */
1443         p9_fid_destroy(fid);
1444         return err;
1445 }
1446 EXPORT_SYMBOL(p9_client_clunk);
1447
1448 int p9_client_remove(struct p9_fid *fid)
1449 {
1450         int err;
1451         struct p9_client *clnt;
1452         struct p9_req_t *req;
1453
1454         P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1455         err = 0;
1456         clnt = fid->clnt;
1457
1458         req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1459         if (IS_ERR(req)) {
1460                 err = PTR_ERR(req);
1461                 goto error;
1462         }
1463
1464         P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1465
1466         p9_free_req(clnt, req);
1467 error:
1468         p9_fid_destroy(fid);
1469         return err;
1470 }
1471 EXPORT_SYMBOL(p9_client_remove);
1472
1473 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1474 {
1475         int err = 0;
1476         struct p9_req_t *req;
1477         struct p9_client *clnt;
1478
1479         P9_DPRINTK(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1480                    dfid->fid, name, flags);
1481
1482         clnt = dfid->clnt;
1483         req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1484         if (IS_ERR(req)) {
1485                 err = PTR_ERR(req);
1486                 goto error;
1487         }
1488         P9_DPRINTK(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1489
1490         p9_free_req(clnt, req);
1491 error:
1492         return err;
1493 }
1494 EXPORT_SYMBOL(p9_client_unlinkat);
1495
1496 int
1497 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1498                                                                 u32 count)
1499 {
1500         char *dataptr;
1501         int kernel_buf = 0;
1502         struct p9_req_t *req;
1503         struct p9_client *clnt;
1504         int err, rsize, non_zc = 0;
1505
1506
1507         P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1508                    fid->fid, (long long unsigned) offset, count);
1509         err = 0;
1510         clnt = fid->clnt;
1511
1512         rsize = fid->iounit;
1513         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1514                 rsize = clnt->msize - P9_IOHDRSZ;
1515
1516         if (count < rsize)
1517                 rsize = count;
1518
1519         /* Don't bother zerocopy for small IO (< 1024) */
1520         if (clnt->trans_mod->zc_request && rsize > 1024) {
1521                 char *indata;
1522                 if (data) {
1523                         kernel_buf = 1;
1524                         indata = data;
1525                 } else
1526                         indata = (char *)udata;
1527                 /*
1528                  * response header len is 11
1529                  * PDU Header(7) + IO Size (4)
1530                  */
1531                 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1532                                        11, kernel_buf, "dqd", fid->fid,
1533                                        offset, rsize);
1534         } else {
1535                 non_zc = 1;
1536                 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1537                                     rsize);
1538         }
1539         if (IS_ERR(req)) {
1540                 err = PTR_ERR(req);
1541                 goto error;
1542         }
1543
1544         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1545         if (err) {
1546                 P9_DUMP_PKT(1, req->rc);
1547                 goto free_and_error;
1548         }
1549
1550         P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1551         P9_DUMP_PKT(1, req->rc);
1552
1553         if (non_zc) {
1554                 if (data) {
1555                         memmove(data, dataptr, count);
1556                 } else {
1557                         err = copy_to_user(udata, dataptr, count);
1558                         if (err) {
1559                                 err = -EFAULT;
1560                                 goto free_and_error;
1561                         }
1562                 }
1563         }
1564         p9_free_req(clnt, req);
1565         return count;
1566
1567 free_and_error:
1568         p9_free_req(clnt, req);
1569 error:
1570         return err;
1571 }
1572 EXPORT_SYMBOL(p9_client_read);
1573
1574 int
1575 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1576                                                         u64 offset, u32 count)
1577 {
1578         int err, rsize;
1579         int kernel_buf = 0;
1580         struct p9_client *clnt;
1581         struct p9_req_t *req;
1582
1583         P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1584                                 fid->fid, (long long unsigned) offset, count);
1585         err = 0;
1586         clnt = fid->clnt;
1587
1588         rsize = fid->iounit;
1589         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1590                 rsize = clnt->msize - P9_IOHDRSZ;
1591
1592         if (count < rsize)
1593                 rsize = count;
1594
1595         /* Don't bother zerocopy for small IO (< 1024) */
1596         if (clnt->trans_mod->zc_request && rsize > 1024) {
1597                 char *odata;
1598                 if (data) {
1599                         kernel_buf = 1;
1600                         odata = data;
1601                 } else
1602                         odata = (char *)udata;
1603                 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1604                                        P9_ZC_HDR_SZ, kernel_buf, "dqd",
1605                                        fid->fid, offset, rsize);
1606         } else {
1607                 if (data)
1608                         req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1609                                             offset, rsize, data);
1610                 else
1611                         req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1612                                             offset, rsize, udata);
1613         }
1614         if (IS_ERR(req)) {
1615                 err = PTR_ERR(req);
1616                 goto error;
1617         }
1618
1619         err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1620         if (err) {
1621                 P9_DUMP_PKT(1, req->rc);
1622                 goto free_and_error;
1623         }
1624
1625         P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1626
1627         p9_free_req(clnt, req);
1628         return count;
1629
1630 free_and_error:
1631         p9_free_req(clnt, req);
1632 error:
1633         return err;
1634 }
1635 EXPORT_SYMBOL(p9_client_write);
1636
1637 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1638 {
1639         int err;
1640         struct p9_client *clnt;
1641         struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1642         struct p9_req_t *req;
1643         u16 ignored;
1644
1645         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1646
1647         if (!ret)
1648                 return ERR_PTR(-ENOMEM);
1649
1650         err = 0;
1651         clnt = fid->clnt;
1652
1653         req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1654         if (IS_ERR(req)) {
1655                 err = PTR_ERR(req);
1656                 goto error;
1657         }
1658
1659         err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1660         if (err) {
1661                 P9_DUMP_PKT(1, req->rc);
1662                 p9_free_req(clnt, req);
1663                 goto error;
1664         }
1665
1666         P9_DPRINTK(P9_DEBUG_9P,
1667                 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1668                 "<<<    mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1669                 "<<<    name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1670                 "<<<    uid=%d gid=%d n_muid=%d\n",
1671                 ret->size, ret->type, ret->dev, ret->qid.type,
1672                 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1673                 ret->atime, ret->mtime, (unsigned long long)ret->length,
1674                 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1675                 ret->n_uid, ret->n_gid, ret->n_muid);
1676
1677         p9_free_req(clnt, req);
1678         return ret;
1679
1680 error:
1681         kfree(ret);
1682         return ERR_PTR(err);
1683 }
1684 EXPORT_SYMBOL(p9_client_stat);
1685
1686 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1687                                                         u64 request_mask)
1688 {
1689         int err;
1690         struct p9_client *clnt;
1691         struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1692                                                                 GFP_KERNEL);
1693         struct p9_req_t *req;
1694
1695         P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1696                                                         fid->fid, request_mask);
1697
1698         if (!ret)
1699                 return ERR_PTR(-ENOMEM);
1700
1701         err = 0;
1702         clnt = fid->clnt;
1703
1704         req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1705         if (IS_ERR(req)) {
1706                 err = PTR_ERR(req);
1707                 goto error;
1708         }
1709
1710         err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1711         if (err) {
1712                 P9_DUMP_PKT(1, req->rc);
1713                 p9_free_req(clnt, req);
1714                 goto error;
1715         }
1716
1717         P9_DPRINTK(P9_DEBUG_9P,
1718                 "<<< RGETATTR st_result_mask=%lld\n"
1719                 "<<< qid=%x.%llx.%x\n"
1720                 "<<< st_mode=%8.8x st_nlink=%llu\n"
1721                 "<<< st_uid=%d st_gid=%d\n"
1722                 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1723                 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1724                 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1725                 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1726                 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1727                 "<<< st_gen=%lld st_data_version=%lld",
1728                 ret->st_result_mask, ret->qid.type, ret->qid.path,
1729                 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1730                 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1731                 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1732                 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1733                 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1734                 ret->st_gen, ret->st_data_version);
1735
1736         p9_free_req(clnt, req);
1737         return ret;
1738
1739 error:
1740         kfree(ret);
1741         return ERR_PTR(err);
1742 }
1743 EXPORT_SYMBOL(p9_client_getattr_dotl);
1744
1745 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1746 {
1747         int ret;
1748
1749         /* NOTE: size shouldn't include its own length */
1750         /* size[2] type[2] dev[4] qid[13] */
1751         /* mode[4] atime[4] mtime[4] length[8]*/
1752         /* name[s] uid[s] gid[s] muid[s] */
1753         ret = 2+4+13+4+4+4+8+2+2+2+2;
1754
1755         if (wst->name)
1756                 ret += strlen(wst->name);
1757         if (wst->uid)
1758                 ret += strlen(wst->uid);
1759         if (wst->gid)
1760                 ret += strlen(wst->gid);
1761         if (wst->muid)
1762                 ret += strlen(wst->muid);
1763
1764         if ((proto_version == p9_proto_2000u) ||
1765                 (proto_version == p9_proto_2000L)) {
1766                 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1767                 if (wst->extension)
1768                         ret += strlen(wst->extension);
1769         }
1770
1771         return ret;
1772 }
1773
1774 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1775 {
1776         int err;
1777         struct p9_req_t *req;
1778         struct p9_client *clnt;
1779
1780         err = 0;
1781         clnt = fid->clnt;
1782         wst->size = p9_client_statsize(wst, clnt->proto_version);
1783         P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1784         P9_DPRINTK(P9_DEBUG_9P,
1785                 "     sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1786                 "     mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1787                 "     name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1788                 "     uid=%d gid=%d n_muid=%d\n",
1789                 wst->size, wst->type, wst->dev, wst->qid.type,
1790                 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1791                 wst->atime, wst->mtime, (unsigned long long)wst->length,
1792                 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1793                 wst->n_uid, wst->n_gid, wst->n_muid);
1794
1795         req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1796         if (IS_ERR(req)) {
1797                 err = PTR_ERR(req);
1798                 goto error;
1799         }
1800
1801         P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1802
1803         p9_free_req(clnt, req);
1804 error:
1805         return err;
1806 }
1807 EXPORT_SYMBOL(p9_client_wstat);
1808
1809 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1810 {
1811         int err;
1812         struct p9_req_t *req;
1813         struct p9_client *clnt;
1814
1815         err = 0;
1816         clnt = fid->clnt;
1817         P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1818         P9_DPRINTK(P9_DEBUG_9P,
1819                 "    valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1820                 "    atime_sec=%lld atime_nsec=%lld\n"
1821                 "    mtime_sec=%lld mtime_nsec=%lld\n",
1822                 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1823                 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1824                 p9attr->mtime_sec, p9attr->mtime_nsec);
1825
1826         req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1827
1828         if (IS_ERR(req)) {
1829                 err = PTR_ERR(req);
1830                 goto error;
1831         }
1832         P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1833         p9_free_req(clnt, req);
1834 error:
1835         return err;
1836 }
1837 EXPORT_SYMBOL(p9_client_setattr);
1838
1839 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1840 {
1841         int err;
1842         struct p9_req_t *req;
1843         struct p9_client *clnt;
1844
1845         err = 0;
1846         clnt = fid->clnt;
1847
1848         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1849
1850         req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1851         if (IS_ERR(req)) {
1852                 err = PTR_ERR(req);
1853                 goto error;
1854         }
1855
1856         err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1857                 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1858                 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1859         if (err) {
1860                 P9_DUMP_PKT(1, req->rc);
1861                 p9_free_req(clnt, req);
1862                 goto error;
1863         }
1864
1865         P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1866                 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1867                 "fsid %llu namelen %ld\n",
1868                 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1869                 sb->blocks, sb->bfree, sb->bavail, sb->files,  sb->ffree,
1870                 sb->fsid, (long int)sb->namelen);
1871
1872         p9_free_req(clnt, req);
1873 error:
1874         return err;
1875 }
1876 EXPORT_SYMBOL(p9_client_statfs);
1877
1878 int p9_client_rename(struct p9_fid *fid,
1879                      struct p9_fid *newdirfid, const char *name)
1880 {
1881         int err;
1882         struct p9_req_t *req;
1883         struct p9_client *clnt;
1884
1885         err = 0;
1886         clnt = fid->clnt;
1887
1888         P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1889                         fid->fid, newdirfid->fid, name);
1890
1891         req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1892                         newdirfid->fid, name);
1893         if (IS_ERR(req)) {
1894                 err = PTR_ERR(req);
1895                 goto error;
1896         }
1897
1898         P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1899
1900         p9_free_req(clnt, req);
1901 error:
1902         return err;
1903 }
1904 EXPORT_SYMBOL(p9_client_rename);
1905
1906 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1907                        struct p9_fid *newdirfid, const char *new_name)
1908 {
1909         int err;
1910         struct p9_req_t *req;
1911         struct p9_client *clnt;
1912
1913         err = 0;
1914         clnt = olddirfid->clnt;
1915
1916         P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1917                    " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1918                    newdirfid->fid, new_name);
1919
1920         req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1921                             old_name, newdirfid->fid, new_name);
1922         if (IS_ERR(req)) {
1923                 err = PTR_ERR(req);
1924                 goto error;
1925         }
1926
1927         P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1928                    newdirfid->fid, new_name);
1929
1930         p9_free_req(clnt, req);
1931 error:
1932         return err;
1933 }
1934 EXPORT_SYMBOL(p9_client_renameat);
1935
1936 /*
1937  * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1938  */
1939 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1940                                 const char *attr_name, u64 *attr_size)
1941 {
1942         int err;
1943         struct p9_req_t *req;
1944         struct p9_client *clnt;
1945         struct p9_fid *attr_fid;
1946
1947         err = 0;
1948         clnt = file_fid->clnt;
1949         attr_fid = p9_fid_create(clnt);
1950         if (IS_ERR(attr_fid)) {
1951                 err = PTR_ERR(attr_fid);
1952                 attr_fid = NULL;
1953                 goto error;
1954         }
1955         P9_DPRINTK(P9_DEBUG_9P,
1956                 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1957                 file_fid->fid, attr_fid->fid, attr_name);
1958
1959         req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1960                         file_fid->fid, attr_fid->fid, attr_name);
1961         if (IS_ERR(req)) {
1962                 err = PTR_ERR(req);
1963                 goto error;
1964         }
1965         err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1966         if (err) {
1967                 P9_DUMP_PKT(1, req->rc);
1968                 p9_free_req(clnt, req);
1969                 goto clunk_fid;
1970         }
1971         p9_free_req(clnt, req);
1972         P9_DPRINTK(P9_DEBUG_9P, "<<<  RXATTRWALK fid %d size %llu\n",
1973                 attr_fid->fid, *attr_size);
1974         return attr_fid;
1975 clunk_fid:
1976         p9_client_clunk(attr_fid);
1977         attr_fid = NULL;
1978 error:
1979         if (attr_fid && (attr_fid != file_fid))
1980                 p9_fid_destroy(attr_fid);
1981
1982         return ERR_PTR(err);
1983 }
1984 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1985
1986 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1987                         u64 attr_size, int flags)
1988 {
1989         int err;
1990         struct p9_req_t *req;
1991         struct p9_client *clnt;
1992
1993         P9_DPRINTK(P9_DEBUG_9P,
1994                 ">>> TXATTRCREATE fid %d name  %s size %lld flag %d\n",
1995                 fid->fid, name, (long long)attr_size, flags);
1996         err = 0;
1997         clnt = fid->clnt;
1998         req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1999                         fid->fid, name, attr_size, flags);
2000         if (IS_ERR(req)) {
2001                 err = PTR_ERR(req);
2002                 goto error;
2003         }
2004         P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2005         p9_free_req(clnt, req);
2006 error:
2007         return err;
2008 }
2009 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2010
2011 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2012 {
2013         int err, rsize, non_zc = 0;
2014         struct p9_client *clnt;
2015         struct p9_req_t *req;
2016         char *dataptr;
2017
2018         P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2019                                 fid->fid, (long long unsigned) offset, count);
2020
2021         err = 0;
2022         clnt = fid->clnt;
2023
2024         rsize = fid->iounit;
2025         if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2026                 rsize = clnt->msize - P9_READDIRHDRSZ;
2027
2028         if (count < rsize)
2029                 rsize = count;
2030
2031         /* Don't bother zerocopy for small IO (< 1024) */
2032         if (clnt->trans_mod->zc_request && rsize > 1024) {
2033                 /*
2034                  * response header len is 11
2035                  * PDU Header(7) + IO Size (4)
2036                  */
2037                 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2038                                        11, 1, "dqd", fid->fid, offset, rsize);
2039         } else {
2040                 non_zc = 1;
2041                 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2042                                     offset, rsize);
2043         }
2044         if (IS_ERR(req)) {
2045                 err = PTR_ERR(req);
2046                 goto error;
2047         }
2048
2049         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2050         if (err) {
2051                 P9_DUMP_PKT(1, req->rc);
2052                 goto free_and_error;
2053         }
2054
2055         P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2056
2057         if (non_zc)
2058                 memmove(data, dataptr, count);
2059
2060         p9_free_req(clnt, req);
2061         return count;
2062
2063 free_and_error:
2064         p9_free_req(clnt, req);
2065 error:
2066         return err;
2067 }
2068 EXPORT_SYMBOL(p9_client_readdir);
2069
2070 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2071                         dev_t rdev, gid_t gid, struct p9_qid *qid)
2072 {
2073         int err;
2074         struct p9_client *clnt;
2075         struct p9_req_t *req;
2076
2077         err = 0;
2078         clnt = fid->clnt;
2079         P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2080                 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2081         req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
2082                 MAJOR(rdev), MINOR(rdev), gid);
2083         if (IS_ERR(req))
2084                 return PTR_ERR(req);
2085
2086         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2087         if (err) {
2088                 P9_DUMP_PKT(1, req->rc);
2089                 goto error;
2090         }
2091         P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2092                                 (unsigned long long)qid->path, qid->version);
2093
2094 error:
2095         p9_free_req(clnt, req);
2096         return err;
2097
2098 }
2099 EXPORT_SYMBOL(p9_client_mknod_dotl);
2100
2101 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2102                                 gid_t gid, struct p9_qid *qid)
2103 {
2104         int err;
2105         struct p9_client *clnt;
2106         struct p9_req_t *req;
2107
2108         err = 0;
2109         clnt = fid->clnt;
2110         P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2111                  fid->fid, name, mode, gid);
2112         req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
2113                 gid);
2114         if (IS_ERR(req))
2115                 return PTR_ERR(req);
2116
2117         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2118         if (err) {
2119                 P9_DUMP_PKT(1, req->rc);
2120                 goto error;
2121         }
2122         P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2123                                 (unsigned long long)qid->path, qid->version);
2124
2125 error:
2126         p9_free_req(clnt, req);
2127         return err;
2128
2129 }
2130 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2131
2132 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2133 {
2134         int err;
2135         struct p9_client *clnt;
2136         struct p9_req_t *req;
2137
2138         err = 0;
2139         clnt = fid->clnt;
2140         P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2141                         "start %lld length %lld proc_id %d client_id %s\n",
2142                         fid->fid, flock->type, flock->flags, flock->start,
2143                         flock->length, flock->proc_id, flock->client_id);
2144
2145         req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2146                                 flock->flags, flock->start, flock->length,
2147                                         flock->proc_id, flock->client_id);
2148
2149         if (IS_ERR(req))
2150                 return PTR_ERR(req);
2151
2152         err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2153         if (err) {
2154                 P9_DUMP_PKT(1, req->rc);
2155                 goto error;
2156         }
2157         P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2158 error:
2159         p9_free_req(clnt, req);
2160         return err;
2161
2162 }
2163 EXPORT_SYMBOL(p9_client_lock_dotl);
2164
2165 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2166 {
2167         int err;
2168         struct p9_client *clnt;
2169         struct p9_req_t *req;
2170
2171         err = 0;
2172         clnt = fid->clnt;
2173         P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2174                 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2175                 glock->start, glock->length, glock->proc_id, glock->client_id);
2176
2177         req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid,  glock->type,
2178                 glock->start, glock->length, glock->proc_id, glock->client_id);
2179
2180         if (IS_ERR(req))
2181                 return PTR_ERR(req);
2182
2183         err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2184                         &glock->start, &glock->length, &glock->proc_id,
2185                         &glock->client_id);
2186         if (err) {
2187                 P9_DUMP_PKT(1, req->rc);
2188                 goto error;
2189         }
2190         P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2191                 "proc_id %d client_id %s\n", glock->type, glock->start,
2192                 glock->length, glock->proc_id, glock->client_id);
2193 error:
2194         p9_free_req(clnt, req);
2195         return err;
2196 }
2197 EXPORT_SYMBOL(p9_client_getlock_dotl);
2198
2199 int p9_client_readlink(struct p9_fid *fid, char **target)
2200 {
2201         int err;
2202         struct p9_client *clnt;
2203         struct p9_req_t *req;
2204
2205         err = 0;
2206         clnt = fid->clnt;
2207         P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2208
2209         req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2210         if (IS_ERR(req))
2211                 return PTR_ERR(req);
2212
2213         err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2214         if (err) {
2215                 P9_DUMP_PKT(1, req->rc);
2216                 goto error;
2217         }
2218         P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2219 error:
2220         p9_free_req(clnt, req);
2221         return err;
2222 }
2223 EXPORT_SYMBOL(p9_client_readlink);