linux/net/9p/client.c
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   1/*
   2 * net/9p/clnt.c
   3 *
   4 * 9P Client
   5 *
   6 *  Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
   7 *  Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
   8 *
   9 *  This program is free software; you can redistribute it and/or modify
  10 *  it under the terms of the GNU General Public License version 2
  11 *  as published by the Free Software Foundation.
  12 *
  13 *  This program is distributed in the hope that it will be useful,
  14 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 *  GNU General Public License for more details.
  17 *
  18 *  You should have received a copy of the GNU General Public License
  19 *  along with this program; if not, write to:
  20 *  Free Software Foundation
  21 *  51 Franklin Street, Fifth Floor
  22 *  Boston, MA  02111-1301  USA
  23 *
  24 */
  25
  26#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  27
  28#include <linux/module.h>
  29#include <linux/errno.h>
  30#include <linux/fs.h>
  31#include <linux/poll.h>
  32#include <linux/idr.h>
  33#include <linux/mutex.h>
  34#include <linux/slab.h>
  35#include <linux/sched.h>
  36#include <linux/uaccess.h>
  37#include <net/9p/9p.h>
  38#include <linux/parser.h>
  39#include <net/9p/client.h>
  40#include <net/9p/transport.h>
  41#include "protocol.h"
  42
  43#define CREATE_TRACE_POINTS
  44#include <trace/events/9p.h>
  45
  46/*
  47  * Client Option Parsing (code inspired by NFS code)
  48  *  - a little lazy - parse all client options
  49  */
  50
  51enum {
  52        Opt_msize,
  53        Opt_trans,
  54        Opt_legacy,
  55        Opt_version,
  56        Opt_err,
  57};
  58
  59static const match_table_t tokens = {
  60        {Opt_msize, "msize=%u"},
  61        {Opt_legacy, "noextend"},
  62        {Opt_trans, "trans=%s"},
  63        {Opt_version, "version=%s"},
  64        {Opt_err, NULL},
  65};
  66
  67inline int p9_is_proto_dotl(struct p9_client *clnt)
  68{
  69        return clnt->proto_version == p9_proto_2000L;
  70}
  71EXPORT_SYMBOL(p9_is_proto_dotl);
  72
  73inline int p9_is_proto_dotu(struct p9_client *clnt)
  74{
  75        return clnt->proto_version == p9_proto_2000u;
  76}
  77EXPORT_SYMBOL(p9_is_proto_dotu);
  78
  79/* Interpret mount option for protocol version */
  80static int get_protocol_version(char *s)
  81{
  82        int version = -EINVAL;
  83
  84        if (!strcmp(s, "9p2000")) {
  85                version = p9_proto_legacy;
  86                p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
  87        } else if (!strcmp(s, "9p2000.u")) {
  88                version = p9_proto_2000u;
  89                p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
  90        } else if (!strcmp(s, "9p2000.L")) {
  91                version = p9_proto_2000L;
  92                p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
  93        } else
  94                pr_info("Unknown protocol version %s\n", s);
  95
  96        return version;
  97}
  98
  99/**
 100 * parse_options - parse mount options into client structure
 101 * @opts: options string passed from mount
 102 * @clnt: existing v9fs client information
 103 *
 104 * Return 0 upon success, -ERRNO upon failure
 105 */
 106
 107static int parse_opts(char *opts, struct p9_client *clnt)
 108{
 109        char *options, *tmp_options;
 110        char *p;
 111        substring_t args[MAX_OPT_ARGS];
 112        int option;
 113        char *s;
 114        int ret = 0;
 115
 116        clnt->proto_version = p9_proto_2000u;
 117        clnt->msize = 8192;
 118
 119        if (!opts)
 120                return 0;
 121
 122        tmp_options = kstrdup(opts, GFP_KERNEL);
 123        if (!tmp_options) {
 124                p9_debug(P9_DEBUG_ERROR,
 125                         "failed to allocate copy of option string\n");
 126                return -ENOMEM;
 127        }
 128        options = tmp_options;
 129
 130        while ((p = strsep(&options, ",")) != NULL) {
 131                int token, r;
 132                if (!*p)
 133                        continue;
 134                token = match_token(p, tokens, args);
 135                switch (token) {
 136                case Opt_msize:
 137                        r = match_int(&args[0], &option);
 138                        if (r < 0) {
 139                                p9_debug(P9_DEBUG_ERROR,
 140                                         "integer field, but no integer?\n");
 141                                ret = r;
 142                                continue;
 143                        }
 144                        clnt->msize = option;
 145                        break;
 146                case Opt_trans:
 147                        s = match_strdup(&args[0]);
 148                        if (!s) {
 149                                ret = -ENOMEM;
 150                                p9_debug(P9_DEBUG_ERROR,
 151                                         "problem allocating copy of trans arg\n");
 152                                goto free_and_return;
 153                         }
 154                        clnt->trans_mod = v9fs_get_trans_by_name(s);
 155                        if (clnt->trans_mod == NULL) {
 156                                pr_info("Could not find request transport: %s\n",
 157                                        s);
 158                                ret = -EINVAL;
 159                                kfree(s);
 160                                goto free_and_return;
 161                        }
 162                        kfree(s);
 163                        break;
 164                case Opt_legacy:
 165                        clnt->proto_version = p9_proto_legacy;
 166                        break;
 167                case Opt_version:
 168                        s = match_strdup(&args[0]);
 169                        if (!s) {
 170                                ret = -ENOMEM;
 171                                p9_debug(P9_DEBUG_ERROR,
 172                                         "problem allocating copy of version arg\n");
 173                                goto free_and_return;
 174                        }
 175                        ret = get_protocol_version(s);
 176                        if (ret == -EINVAL) {
 177                                kfree(s);
 178                                goto free_and_return;
 179                        }
 180                        kfree(s);
 181                        clnt->proto_version = ret;
 182                        break;
 183                default:
 184                        continue;
 185                }
 186        }
 187
 188free_and_return:
 189        kfree(tmp_options);
 190        return ret;
 191}
 192
 193/**
 194 * p9_tag_alloc - lookup/allocate a request by tag
 195 * @c: client session to lookup tag within
 196 * @tag: numeric id for transaction
 197 *
 198 * this is a simple array lookup, but will grow the
 199 * request_slots as necessary to accommodate transaction
 200 * ids which did not previously have a slot.
 201 *
 202 * this code relies on the client spinlock to manage locks, its
 203 * possible we should switch to something else, but I'd rather
 204 * stick with something low-overhead for the common case.
 205 *
 206 */
 207
 208static struct p9_req_t *
 209p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
 210{
 211        unsigned long flags;
 212        int row, col;
 213        struct p9_req_t *req;
 214        int alloc_msize = min(c->msize, max_size);
 215
 216        /* This looks up the original request by tag so we know which
 217         * buffer to read the data into */
 218        tag++;
 219
 220        if (tag >= c->max_tag) {
 221                spin_lock_irqsave(&c->lock, flags);
 222                /* check again since original check was outside of lock */
 223                while (tag >= c->max_tag) {
 224                        row = (tag / P9_ROW_MAXTAG);
 225                        c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
 226                                        sizeof(struct p9_req_t), GFP_ATOMIC);
 227
 228                        if (!c->reqs[row]) {
 229                                pr_err("Couldn't grow tag array\n");
 230                                spin_unlock_irqrestore(&c->lock, flags);
 231                                return ERR_PTR(-ENOMEM);
 232                        }
 233                        for (col = 0; col < P9_ROW_MAXTAG; col++) {
 234                                c->reqs[row][col].status = REQ_STATUS_IDLE;
 235                                c->reqs[row][col].tc = NULL;
 236                        }
 237                        c->max_tag += P9_ROW_MAXTAG;
 238                }
 239                spin_unlock_irqrestore(&c->lock, flags);
 240        }
 241        row = tag / P9_ROW_MAXTAG;
 242        col = tag % P9_ROW_MAXTAG;
 243
 244        req = &c->reqs[row][col];
 245        if (!req->tc) {
 246                req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
 247                if (!req->wq) {
 248                        pr_err("Couldn't grow tag array\n");
 249                        return ERR_PTR(-ENOMEM);
 250                }
 251                init_waitqueue_head(req->wq);
 252                req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
 253                                  GFP_NOFS);
 254                req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
 255                                  GFP_NOFS);
 256                if ((!req->tc) || (!req->rc)) {
 257                        pr_err("Couldn't grow tag array\n");
 258                        kfree(req->tc);
 259                        kfree(req->rc);
 260                        kfree(req->wq);
 261                        req->tc = req->rc = NULL;
 262                        req->wq = NULL;
 263                        return ERR_PTR(-ENOMEM);
 264                }
 265                req->tc->capacity = alloc_msize;
 266                req->rc->capacity = alloc_msize;
 267                req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
 268                req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
 269        }
 270
 271        p9pdu_reset(req->tc);
 272        p9pdu_reset(req->rc);
 273
 274        req->tc->tag = tag-1;
 275        req->status = REQ_STATUS_ALLOC;
 276
 277        return &c->reqs[row][col];
 278}
 279
 280/**
 281 * p9_tag_lookup - lookup a request by tag
 282 * @c: client session to lookup tag within
 283 * @tag: numeric id for transaction
 284 *
 285 */
 286
 287struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
 288{
 289        int row, col;
 290
 291        /* This looks up the original request by tag so we know which
 292         * buffer to read the data into */
 293        tag++;
 294
 295        if(tag >= c->max_tag) 
 296                return NULL;
 297
 298        row = tag / P9_ROW_MAXTAG;
 299        col = tag % P9_ROW_MAXTAG;
 300
 301        return &c->reqs[row][col];
 302}
 303EXPORT_SYMBOL(p9_tag_lookup);
 304
 305/**
 306 * p9_tag_init - setup tags structure and contents
 307 * @c:  v9fs client struct
 308 *
 309 * This initializes the tags structure for each client instance.
 310 *
 311 */
 312
 313static int p9_tag_init(struct p9_client *c)
 314{
 315        int err = 0;
 316
 317        c->tagpool = p9_idpool_create();
 318        if (IS_ERR(c->tagpool)) {
 319                err = PTR_ERR(c->tagpool);
 320                goto error;
 321        }
 322        err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
 323        if (err < 0) {
 324                p9_idpool_destroy(c->tagpool);
 325                goto error;
 326        }
 327        c->max_tag = 0;
 328error:
 329        return err;
 330}
 331
 332/**
 333 * p9_tag_cleanup - cleans up tags structure and reclaims resources
 334 * @c:  v9fs client struct
 335 *
 336 * This frees resources associated with the tags structure
 337 *
 338 */
 339static void p9_tag_cleanup(struct p9_client *c)
 340{
 341        int row, col;
 342
 343        /* check to insure all requests are idle */
 344        for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
 345                for (col = 0; col < P9_ROW_MAXTAG; col++) {
 346                        if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
 347                                p9_debug(P9_DEBUG_MUX,
 348                                         "Attempting to cleanup non-free tag %d,%d\n",
 349                                         row, col);
 350                                /* TODO: delay execution of cleanup */
 351                                return;
 352                        }
 353                }
 354        }
 355
 356        if (c->tagpool) {
 357                p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
 358                p9_idpool_destroy(c->tagpool);
 359        }
 360
 361        /* free requests associated with tags */
 362        for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
 363                for (col = 0; col < P9_ROW_MAXTAG; col++) {
 364                        kfree(c->reqs[row][col].wq);
 365                        kfree(c->reqs[row][col].tc);
 366                        kfree(c->reqs[row][col].rc);
 367                }
 368                kfree(c->reqs[row]);
 369        }
 370        c->max_tag = 0;
 371}
 372
 373/**
 374 * p9_free_req - free a request and clean-up as necessary
 375 * c: client state
 376 * r: request to release
 377 *
 378 */
 379
 380static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
 381{
 382        int tag = r->tc->tag;
 383        p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
 384
 385        r->status = REQ_STATUS_IDLE;
 386        if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
 387                p9_idpool_put(tag, c->tagpool);
 388}
 389
 390/**
 391 * p9_client_cb - call back from transport to client
 392 * c: client state
 393 * req: request received
 394 *
 395 */
 396void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
 397{
 398        p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
 399        wake_up(req->wq);
 400        p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
 401}
 402EXPORT_SYMBOL(p9_client_cb);
 403
 404/**
 405 * p9_parse_header - parse header arguments out of a packet
 406 * @pdu: packet to parse
 407 * @size: size of packet
 408 * @type: type of request
 409 * @tag: tag of packet
 410 * @rewind: set if we need to rewind offset afterwards
 411 */
 412
 413int
 414p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
 415                                                                int rewind)
 416{
 417        int8_t r_type;
 418        int16_t r_tag;
 419        int32_t r_size;
 420        int offset = pdu->offset;
 421        int err;
 422
 423        pdu->offset = 0;
 424        if (pdu->size == 0)
 425                pdu->size = 7;
 426
 427        err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
 428        if (err)
 429                goto rewind_and_exit;
 430
 431        pdu->size = r_size;
 432        pdu->id = r_type;
 433        pdu->tag = r_tag;
 434
 435        p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
 436                 pdu->size, pdu->id, pdu->tag);
 437
 438        if (type)
 439                *type = r_type;
 440        if (tag)
 441                *tag = r_tag;
 442        if (size)
 443                *size = r_size;
 444
 445
 446rewind_and_exit:
 447        if (rewind)
 448                pdu->offset = offset;
 449        return err;
 450}
 451EXPORT_SYMBOL(p9_parse_header);
 452
 453/**
 454 * p9_check_errors - check 9p packet for error return and process it
 455 * @c: current client instance
 456 * @req: request to parse and check for error conditions
 457 *
 458 * returns error code if one is discovered, otherwise returns 0
 459 *
 460 * this will have to be more complicated if we have multiple
 461 * error packet types
 462 */
 463
 464static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
 465{
 466        int8_t type;
 467        int err;
 468        int ecode;
 469
 470        err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
 471        /*
 472         * dump the response from server
 473         * This should be after check errors which poplulate pdu_fcall.
 474         */
 475        trace_9p_protocol_dump(c, req->rc);
 476        if (err) {
 477                p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
 478                return err;
 479        }
 480        if (type != P9_RERROR && type != P9_RLERROR)
 481                return 0;
 482
 483        if (!p9_is_proto_dotl(c)) {
 484                char *ename;
 485                err = p9pdu_readf(req->rc, c->proto_version, "s?d",
 486                                  &ename, &ecode);
 487                if (err)
 488                        goto out_err;
 489
 490                if (p9_is_proto_dotu(c))
 491                        err = -ecode;
 492
 493                if (!err || !IS_ERR_VALUE(err)) {
 494                        err = p9_errstr2errno(ename, strlen(ename));
 495
 496                        p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
 497                                 -ecode, ename);
 498                }
 499                kfree(ename);
 500        } else {
 501                err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
 502                err = -ecode;
 503
 504                p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
 505        }
 506
 507        return err;
 508
 509out_err:
 510        p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
 511
 512        return err;
 513}
 514
 515/**
 516 * p9_check_zc_errors - check 9p packet for error return and process it
 517 * @c: current client instance
 518 * @req: request to parse and check for error conditions
 519 * @in_hdrlen: Size of response protocol buffer.
 520 *
 521 * returns error code if one is discovered, otherwise returns 0
 522 *
 523 * this will have to be more complicated if we have multiple
 524 * error packet types
 525 */
 526
 527static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
 528                              char *uidata, int in_hdrlen, int kern_buf)
 529{
 530        int err;
 531        int ecode;
 532        int8_t type;
 533        char *ename = NULL;
 534
 535        err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
 536        /*
 537         * dump the response from server
 538         * This should be after parse_header which poplulate pdu_fcall.
 539         */
 540        trace_9p_protocol_dump(c, req->rc);
 541        if (err) {
 542                p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
 543                return err;
 544        }
 545
 546        if (type != P9_RERROR && type != P9_RLERROR)
 547                return 0;
 548
 549        if (!p9_is_proto_dotl(c)) {
 550                /* Error is reported in string format */
 551                uint16_t len;
 552                /* 7 = header size for RERROR, 2 is the size of string len; */
 553                int inline_len = in_hdrlen - (7 + 2);
 554
 555                /* Read the size of error string */
 556                err = p9pdu_readf(req->rc, c->proto_version, "w", &len);
 557                if (err)
 558                        goto out_err;
 559
 560                ename = kmalloc(len + 1, GFP_NOFS);
 561                if (!ename) {
 562                        err = -ENOMEM;
 563                        goto out_err;
 564                }
 565                if (len <= inline_len) {
 566                        /* We have error in protocol buffer itself */
 567                        if (pdu_read(req->rc, ename, len)) {
 568                                err = -EFAULT;
 569                                goto out_free;
 570
 571                        }
 572                } else {
 573                        /*
 574                         *  Part of the data is in user space buffer.
 575                         */
 576                        if (pdu_read(req->rc, ename, inline_len)) {
 577                                err = -EFAULT;
 578                                goto out_free;
 579
 580                        }
 581                        if (kern_buf) {
 582                                memcpy(ename + inline_len, uidata,
 583                                       len - inline_len);
 584                        } else {
 585                                err = copy_from_user(ename + inline_len,
 586                                                     uidata, len - inline_len);
 587                                if (err) {
 588                                        err = -EFAULT;
 589                                        goto out_free;
 590                                }
 591                        }
 592                }
 593                ename[len] = 0;
 594                if (p9_is_proto_dotu(c)) {
 595                        /* For dotu we also have error code */
 596                        err = p9pdu_readf(req->rc,
 597                                          c->proto_version, "d", &ecode);
 598                        if (err)
 599                                goto out_free;
 600                        err = -ecode;
 601                }
 602                if (!err || !IS_ERR_VALUE(err)) {
 603                        err = p9_errstr2errno(ename, strlen(ename));
 604
 605                        p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
 606                                 -ecode, ename);
 607                }
 608                kfree(ename);
 609        } else {
 610                err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
 611                err = -ecode;
 612
 613                p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
 614        }
 615        return err;
 616
 617out_free:
 618        kfree(ename);
 619out_err:
 620        p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
 621        return err;
 622}
 623
 624static struct p9_req_t *
 625p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
 626
 627/**
 628 * p9_client_flush - flush (cancel) a request
 629 * @c: client state
 630 * @oldreq: request to cancel
 631 *
 632 * This sents a flush for a particular request and links
 633 * the flush request to the original request.  The current
 634 * code only supports a single flush request although the protocol
 635 * allows for multiple flush requests to be sent for a single request.
 636 *
 637 */
 638
 639static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
 640{
 641        struct p9_req_t *req;
 642        int16_t oldtag;
 643        int err;
 644
 645        err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
 646        if (err)
 647                return err;
 648
 649        p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
 650
 651        req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
 652        if (IS_ERR(req))
 653                return PTR_ERR(req);
 654
 655
 656        /* if we haven't received a response for oldreq,
 657           remove it from the list. */
 658        spin_lock(&c->lock);
 659        if (oldreq->status == REQ_STATUS_FLSH)
 660                list_del(&oldreq->req_list);
 661        spin_unlock(&c->lock);
 662
 663        p9_free_req(c, req);
 664        return 0;
 665}
 666
 667static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
 668                                              int8_t type, int req_size,
 669                                              const char *fmt, va_list ap)
 670{
 671        int tag, err;
 672        struct p9_req_t *req;
 673
 674        p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
 675
 676        /* we allow for any status other than disconnected */
 677        if (c->status == Disconnected)
 678                return ERR_PTR(-EIO);
 679
 680        /* if status is begin_disconnected we allow only clunk request */
 681        if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
 682                return ERR_PTR(-EIO);
 683
 684        tag = P9_NOTAG;
 685        if (type != P9_TVERSION) {
 686                tag = p9_idpool_get(c->tagpool);
 687                if (tag < 0)
 688                        return ERR_PTR(-ENOMEM);
 689        }
 690
 691        req = p9_tag_alloc(c, tag, req_size);
 692        if (IS_ERR(req))
 693                return req;
 694
 695        /* marshall the data */
 696        p9pdu_prepare(req->tc, tag, type);
 697        err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
 698        if (err)
 699                goto reterr;
 700        p9pdu_finalize(c, req->tc);
 701        trace_9p_client_req(c, type, tag);
 702        return req;
 703reterr:
 704        p9_free_req(c, req);
 705        return ERR_PTR(err);
 706}
 707
 708/**
 709 * p9_client_rpc - issue a request and wait for a response
 710 * @c: client session
 711 * @type: type of request
 712 * @fmt: protocol format string (see protocol.c)
 713 *
 714 * Returns request structure (which client must free using p9_free_req)
 715 */
 716
 717static struct p9_req_t *
 718p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
 719{
 720        va_list ap;
 721        int sigpending, err;
 722        unsigned long flags;
 723        struct p9_req_t *req;
 724
 725        va_start(ap, fmt);
 726        req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
 727        va_end(ap);
 728        if (IS_ERR(req))
 729                return req;
 730
 731        if (signal_pending(current)) {
 732                sigpending = 1;
 733                clear_thread_flag(TIF_SIGPENDING);
 734        } else
 735                sigpending = 0;
 736
 737        err = c->trans_mod->request(c, req);
 738        if (err < 0) {
 739                if (err != -ERESTARTSYS && err != -EFAULT)
 740                        c->status = Disconnected;
 741                goto reterr;
 742        }
 743        /* Wait for the response */
 744        err = wait_event_interruptible(*req->wq,
 745                                       req->status >= REQ_STATUS_RCVD);
 746
 747        if (req->status == REQ_STATUS_ERROR) {
 748                p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
 749                err = req->t_err;
 750        }
 751        if ((err == -ERESTARTSYS) && (c->status == Connected)) {
 752                p9_debug(P9_DEBUG_MUX, "flushing\n");
 753                sigpending = 1;
 754                clear_thread_flag(TIF_SIGPENDING);
 755
 756                if (c->trans_mod->cancel(c, req))
 757                        p9_client_flush(c, req);
 758
 759                /* if we received the response anyway, don't signal error */
 760                if (req->status == REQ_STATUS_RCVD)
 761                        err = 0;
 762        }
 763        if (sigpending) {
 764                spin_lock_irqsave(&current->sighand->siglock, flags);
 765                recalc_sigpending();
 766                spin_unlock_irqrestore(&current->sighand->siglock, flags);
 767        }
 768        if (err < 0)
 769                goto reterr;
 770
 771        err = p9_check_errors(c, req);
 772        trace_9p_client_res(c, type, req->rc->tag, err);
 773        if (!err)
 774                return req;
 775reterr:
 776        p9_free_req(c, req);
 777        return ERR_PTR(err);
 778}
 779
 780/**
 781 * p9_client_zc_rpc - issue a request and wait for a response
 782 * @c: client session
 783 * @type: type of request
 784 * @uidata: user bffer that should be ued for zero copy read
 785 * @uodata: user buffer that shoud be user for zero copy write
 786 * @inlen: read buffer size
 787 * @olen: write buffer size
 788 * @hdrlen: reader header size, This is the size of response protocol data
 789 * @fmt: protocol format string (see protocol.c)
 790 *
 791 * Returns request structure (which client must free using p9_free_req)
 792 */
 793static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
 794                                         char *uidata, char *uodata,
 795                                         int inlen, int olen, int in_hdrlen,
 796                                         int kern_buf, const char *fmt, ...)
 797{
 798        va_list ap;
 799        int sigpending, err;
 800        unsigned long flags;
 801        struct p9_req_t *req;
 802
 803        va_start(ap, fmt);
 804        /*
 805         * We allocate a inline protocol data of only 4k bytes.
 806         * The actual content is passed in zero-copy fashion.
 807         */
 808        req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
 809        va_end(ap);
 810        if (IS_ERR(req))
 811                return req;
 812
 813        if (signal_pending(current)) {
 814                sigpending = 1;
 815                clear_thread_flag(TIF_SIGPENDING);
 816        } else
 817                sigpending = 0;
 818
 819        /* If we are called with KERNEL_DS force kern_buf */
 820        if (segment_eq(get_fs(), KERNEL_DS))
 821                kern_buf = 1;
 822
 823        err = c->trans_mod->zc_request(c, req, uidata, uodata,
 824                                       inlen, olen, in_hdrlen, kern_buf);
 825        if (err < 0) {
 826                if (err == -EIO)
 827                        c->status = Disconnected;
 828                goto reterr;
 829        }
 830        if (req->status == REQ_STATUS_ERROR) {
 831                p9_debug(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_debug(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;
 858reterr:
 859        p9_free_req(c, req);
 860        return ERR_PTR(err);
 861}
 862
 863static 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_debug(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
 892error:
 893        kfree(fid);
 894        return ERR_PTR(ret);
 895}
 896
 897static void p9_fid_destroy(struct p9_fid *fid)
 898{
 899        struct p9_client *clnt;
 900        unsigned long flags;
 901
 902        p9_debug(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
 912static 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_debug(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_debug(P9_DEBUG_9P, "version error %d\n", err);
 946                trace_9p_protocol_dump(c, req->rc);
 947                goto error;
 948        }
 949
 950        p9_debug(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
 965error:
 966        kfree(version);
 967        p9_free_req(c, req);
 968
 969        return err;
 970}
 971
 972struct 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_debug(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_debug(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
1027close_trans:
1028        clnt->trans_mod->close(clnt);
1029destroy_fidpool:
1030        p9_idpool_destroy(clnt->fidpool);
1031put_trans:
1032        v9fs_put_trans(clnt->trans_mod);
1033destroy_tagpool:
1034        p9_idpool_destroy(clnt->tagpool);
1035free_client:
1036        kfree(clnt);
1037        return ERR_PTR(err);
1038}
1039EXPORT_SYMBOL(p9_client_create);
1040
1041void p9_client_destroy(struct p9_client *clnt)
1042{
1043        struct p9_fid *fid, *fidptr;
1044
1045        p9_debug(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                pr_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}
1064EXPORT_SYMBOL(p9_client_destroy);
1065
1066void p9_client_disconnect(struct p9_client *clnt)
1067{
1068        p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1069        clnt->status = Disconnected;
1070}
1071EXPORT_SYMBOL(p9_client_disconnect);
1072
1073void p9_client_begin_disconnect(struct p9_client *clnt)
1074{
1075        p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1076        clnt->status = BeginDisconnect;
1077}
1078EXPORT_SYMBOL(p9_client_begin_disconnect);
1079
1080struct 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_debug(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_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1113                 qid.type, (unsigned long long)qid.path, qid.version);
1114
1115        memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1116
1117        p9_free_req(clnt, req);
1118        return fid;
1119
1120error:
1121        if (fid)
1122                p9_fid_destroy(fid);
1123        return ERR_PTR(err);
1124}
1125EXPORT_SYMBOL(p9_client_attach);
1126
1127struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1128                char **wnames, int clone)
1129{
1130        int err;
1131        struct p9_client *clnt;
1132        struct p9_fid *fid;
1133        struct p9_qid *wqids;
1134        struct p9_req_t *req;
1135        uint16_t nwqids, count;
1136
1137        err = 0;
1138        wqids = NULL;
1139        clnt = oldfid->clnt;
1140        if (clone) {
1141                fid = p9_fid_create(clnt);
1142                if (IS_ERR(fid)) {
1143                        err = PTR_ERR(fid);
1144                        fid = NULL;
1145                        goto error;
1146                }
1147
1148                fid->uid = oldfid->uid;
1149        } else
1150                fid = oldfid;
1151
1152
1153        p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1154                 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1155
1156        req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1157                                                                nwname, wnames);
1158        if (IS_ERR(req)) {
1159                err = PTR_ERR(req);
1160                goto error;
1161        }
1162
1163        err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1164        if (err) {
1165                trace_9p_protocol_dump(clnt, req->rc);
1166                p9_free_req(clnt, req);
1167                goto clunk_fid;
1168        }
1169        p9_free_req(clnt, req);
1170
1171        p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1172
1173        if (nwqids != nwname) {
1174                err = -ENOENT;
1175                goto clunk_fid;
1176        }
1177
1178        for (count = 0; count < nwqids; count++)
1179                p9_debug(P9_DEBUG_9P, "<<<     [%d] %x.%llx.%x\n",
1180                        count, wqids[count].type,
1181                        (unsigned long long)wqids[count].path,
1182                        wqids[count].version);
1183
1184        if (nwname)
1185                memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1186        else
1187                fid->qid = oldfid->qid;
1188
1189        kfree(wqids);
1190        return fid;
1191
1192clunk_fid:
1193        kfree(wqids);
1194        p9_client_clunk(fid);
1195        fid = NULL;
1196
1197error:
1198        if (fid && (fid != oldfid))
1199                p9_fid_destroy(fid);
1200
1201        return ERR_PTR(err);
1202}
1203EXPORT_SYMBOL(p9_client_walk);
1204
1205int p9_client_open(struct p9_fid *fid, int mode)
1206{
1207        int err;
1208        struct p9_client *clnt;
1209        struct p9_req_t *req;
1210        struct p9_qid qid;
1211        int iounit;
1212
1213        clnt = fid->clnt;
1214        p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1215                p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1216        err = 0;
1217
1218        if (fid->mode != -1)
1219                return -EINVAL;
1220
1221        if (p9_is_proto_dotl(clnt))
1222                req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1223        else
1224                req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1225        if (IS_ERR(req)) {
1226                err = PTR_ERR(req);
1227                goto error;
1228        }
1229
1230        err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1231        if (err) {
1232                trace_9p_protocol_dump(clnt, req->rc);
1233                goto free_and_error;
1234        }
1235
1236        p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1237                p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN",  qid.type,
1238                (unsigned long long)qid.path, qid.version, iounit);
1239
1240        fid->mode = mode;
1241        fid->iounit = iounit;
1242
1243free_and_error:
1244        p9_free_req(clnt, req);
1245error:
1246        return err;
1247}
1248EXPORT_SYMBOL(p9_client_open);
1249
1250int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1251                gid_t gid, struct p9_qid *qid)
1252{
1253        int err = 0;
1254        struct p9_client *clnt;
1255        struct p9_req_t *req;
1256        int iounit;
1257
1258        p9_debug(P9_DEBUG_9P,
1259                        ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1260                        ofid->fid, name, flags, mode, gid);
1261        clnt = ofid->clnt;
1262
1263        if (ofid->mode != -1)
1264                return -EINVAL;
1265
1266        req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1267                        mode, gid);
1268        if (IS_ERR(req)) {
1269                err = PTR_ERR(req);
1270                goto error;
1271        }
1272
1273        err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1274        if (err) {
1275                trace_9p_protocol_dump(clnt, req->rc);
1276                goto free_and_error;
1277        }
1278
1279        p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1280                        qid->type,
1281                        (unsigned long long)qid->path,
1282                        qid->version, iounit);
1283
1284        ofid->mode = mode;
1285        ofid->iounit = iounit;
1286
1287free_and_error:
1288        p9_free_req(clnt, req);
1289error:
1290        return err;
1291}
1292EXPORT_SYMBOL(p9_client_create_dotl);
1293
1294int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1295                     char *extension)
1296{
1297        int err;
1298        struct p9_client *clnt;
1299        struct p9_req_t *req;
1300        struct p9_qid qid;
1301        int iounit;
1302
1303        p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1304                                                fid->fid, name, perm, mode);
1305        err = 0;
1306        clnt = fid->clnt;
1307
1308        if (fid->mode != -1)
1309                return -EINVAL;
1310
1311        req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1312                                mode, extension);
1313        if (IS_ERR(req)) {
1314                err = PTR_ERR(req);
1315                goto error;
1316        }
1317
1318        err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1319        if (err) {
1320                trace_9p_protocol_dump(clnt, req->rc);
1321                goto free_and_error;
1322        }
1323
1324        p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1325                                qid.type,
1326                                (unsigned long long)qid.path,
1327                                qid.version, iounit);
1328
1329        fid->mode = mode;
1330        fid->iounit = iounit;
1331
1332free_and_error:
1333        p9_free_req(clnt, req);
1334error:
1335        return err;
1336}
1337EXPORT_SYMBOL(p9_client_fcreate);
1338
1339int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1340                struct p9_qid *qid)
1341{
1342        int err = 0;
1343        struct p9_client *clnt;
1344        struct p9_req_t *req;
1345
1346        p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s  symtgt %s\n",
1347                        dfid->fid, name, symtgt);
1348        clnt = dfid->clnt;
1349
1350        req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1351                        gid);
1352        if (IS_ERR(req)) {
1353                err = PTR_ERR(req);
1354                goto error;
1355        }
1356
1357        err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1358        if (err) {
1359                trace_9p_protocol_dump(clnt, req->rc);
1360                goto free_and_error;
1361        }
1362
1363        p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1364                        qid->type, (unsigned long long)qid->path, qid->version);
1365
1366free_and_error:
1367        p9_free_req(clnt, req);
1368error:
1369        return err;
1370}
1371EXPORT_SYMBOL(p9_client_symlink);
1372
1373int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1374{
1375        struct p9_client *clnt;
1376        struct p9_req_t *req;
1377
1378        p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1379                        dfid->fid, oldfid->fid, newname);
1380        clnt = dfid->clnt;
1381        req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1382                        newname);
1383        if (IS_ERR(req))
1384                return PTR_ERR(req);
1385
1386        p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1387        p9_free_req(clnt, req);
1388        return 0;
1389}
1390EXPORT_SYMBOL(p9_client_link);
1391
1392int p9_client_fsync(struct p9_fid *fid, int datasync)
1393{
1394        int err;
1395        struct p9_client *clnt;
1396        struct p9_req_t *req;
1397
1398        p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1399                        fid->fid, datasync);
1400        err = 0;
1401        clnt = fid->clnt;
1402
1403        req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1404        if (IS_ERR(req)) {
1405                err = PTR_ERR(req);
1406                goto error;
1407        }
1408
1409        p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1410
1411        p9_free_req(clnt, req);
1412
1413error:
1414        return err;
1415}
1416EXPORT_SYMBOL(p9_client_fsync);
1417
1418int p9_client_clunk(struct p9_fid *fid)
1419{
1420        int err;
1421        struct p9_client *clnt;
1422        struct p9_req_t *req;
1423
1424        if (!fid) {
1425                pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1426                        __func__, task_pid_nr(current));
1427                dump_stack();
1428                return 0;
1429        }
1430
1431        p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1432        err = 0;
1433        clnt = fid->clnt;
1434
1435        req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1436        if (IS_ERR(req)) {
1437                err = PTR_ERR(req);
1438                goto error;
1439        }
1440
1441        p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1442
1443        p9_free_req(clnt, req);
1444error:
1445        /*
1446         * Fid is not valid even after a failed clunk
1447         */
1448        p9_fid_destroy(fid);
1449        return err;
1450}
1451EXPORT_SYMBOL(p9_client_clunk);
1452
1453int p9_client_remove(struct p9_fid *fid)
1454{
1455        int err;
1456        struct p9_client *clnt;
1457        struct p9_req_t *req;
1458
1459        p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1460        err = 0;
1461        clnt = fid->clnt;
1462
1463        req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1464        if (IS_ERR(req)) {
1465                err = PTR_ERR(req);
1466                goto error;
1467        }
1468
1469        p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1470
1471        p9_free_req(clnt, req);
1472error:
1473        p9_fid_destroy(fid);
1474        return err;
1475}
1476EXPORT_SYMBOL(p9_client_remove);
1477
1478int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1479{
1480        int err = 0;
1481        struct p9_req_t *req;
1482        struct p9_client *clnt;
1483
1484        p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1485                   dfid->fid, name, flags);
1486
1487        clnt = dfid->clnt;
1488        req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1489        if (IS_ERR(req)) {
1490                err = PTR_ERR(req);
1491                goto error;
1492        }
1493        p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1494
1495        p9_free_req(clnt, req);
1496error:
1497        return err;
1498}
1499EXPORT_SYMBOL(p9_client_unlinkat);
1500
1501int
1502p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1503                                                                u32 count)
1504{
1505        char *dataptr;
1506        int kernel_buf = 0;
1507        struct p9_req_t *req;
1508        struct p9_client *clnt;
1509        int err, rsize, non_zc = 0;
1510
1511
1512        p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1513                   fid->fid, (long long unsigned) offset, count);
1514        err = 0;
1515        clnt = fid->clnt;
1516
1517        rsize = fid->iounit;
1518        if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1519                rsize = clnt->msize - P9_IOHDRSZ;
1520
1521        if (count < rsize)
1522                rsize = count;
1523
1524        /* Don't bother zerocopy for small IO (< 1024) */
1525        if (clnt->trans_mod->zc_request && rsize > 1024) {
1526                char *indata;
1527                if (data) {
1528                        kernel_buf = 1;
1529                        indata = data;
1530                } else
1531                        indata = (char *)udata;
1532                /*
1533                 * response header len is 11
1534                 * PDU Header(7) + IO Size (4)
1535                 */
1536                req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1537                                       11, kernel_buf, "dqd", fid->fid,
1538                                       offset, rsize);
1539        } else {
1540                non_zc = 1;
1541                req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1542                                    rsize);
1543        }
1544        if (IS_ERR(req)) {
1545                err = PTR_ERR(req);
1546                goto error;
1547        }
1548
1549        err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1550        if (err) {
1551                trace_9p_protocol_dump(clnt, req->rc);
1552                goto free_and_error;
1553        }
1554
1555        p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1556
1557        if (non_zc) {
1558                if (data) {
1559                        memmove(data, dataptr, count);
1560                } else {
1561                        err = copy_to_user(udata, dataptr, count);
1562                        if (err) {
1563                                err = -EFAULT;
1564                                goto free_and_error;
1565                        }
1566                }
1567        }
1568        p9_free_req(clnt, req);
1569        return count;
1570
1571free_and_error:
1572        p9_free_req(clnt, req);
1573error:
1574        return err;
1575}
1576EXPORT_SYMBOL(p9_client_read);
1577
1578int
1579p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1580                                                        u64 offset, u32 count)
1581{
1582        int err, rsize;
1583        int kernel_buf = 0;
1584        struct p9_client *clnt;
1585        struct p9_req_t *req;
1586
1587        p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1588                                fid->fid, (long long unsigned) offset, count);
1589        err = 0;
1590        clnt = fid->clnt;
1591
1592        rsize = fid->iounit;
1593        if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1594                rsize = clnt->msize - P9_IOHDRSZ;
1595
1596        if (count < rsize)
1597                rsize = count;
1598
1599        /* Don't bother zerocopy for small IO (< 1024) */
1600        if (clnt->trans_mod->zc_request && rsize > 1024) {
1601                char *odata;
1602                if (data) {
1603                        kernel_buf = 1;
1604                        odata = data;
1605                } else
1606                        odata = (char *)udata;
1607                req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1608                                       P9_ZC_HDR_SZ, kernel_buf, "dqd",
1609                                       fid->fid, offset, rsize);
1610        } else {
1611                if (data)
1612                        req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1613                                            offset, rsize, data);
1614                else
1615                        req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1616                                            offset, rsize, udata);
1617        }
1618        if (IS_ERR(req)) {
1619                err = PTR_ERR(req);
1620                goto error;
1621        }
1622
1623        err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1624        if (err) {
1625                trace_9p_protocol_dump(clnt, req->rc);
1626                goto free_and_error;
1627        }
1628
1629        p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1630
1631        p9_free_req(clnt, req);
1632        return count;
1633
1634free_and_error:
1635        p9_free_req(clnt, req);
1636error:
1637        return err;
1638}
1639EXPORT_SYMBOL(p9_client_write);
1640
1641struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1642{
1643        int err;
1644        struct p9_client *clnt;
1645        struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1646        struct p9_req_t *req;
1647        u16 ignored;
1648
1649        p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1650
1651        if (!ret)
1652                return ERR_PTR(-ENOMEM);
1653
1654        err = 0;
1655        clnt = fid->clnt;
1656
1657        req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1658        if (IS_ERR(req)) {
1659                err = PTR_ERR(req);
1660                goto error;
1661        }
1662
1663        err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1664        if (err) {
1665                trace_9p_protocol_dump(clnt, req->rc);
1666                p9_free_req(clnt, req);
1667                goto error;
1668        }
1669
1670        p9_debug(P9_DEBUG_9P,
1671                "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1672                "<<<    mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1673                "<<<    name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1674                "<<<    uid=%d gid=%d n_muid=%d\n",
1675                ret->size, ret->type, ret->dev, ret->qid.type,
1676                (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1677                ret->atime, ret->mtime, (unsigned long long)ret->length,
1678                ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1679                ret->n_uid, ret->n_gid, ret->n_muid);
1680
1681        p9_free_req(clnt, req);
1682        return ret;
1683
1684error:
1685        kfree(ret);
1686        return ERR_PTR(err);
1687}
1688EXPORT_SYMBOL(p9_client_stat);
1689
1690struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1691                                                        u64 request_mask)
1692{
1693        int err;
1694        struct p9_client *clnt;
1695        struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1696                                                                GFP_KERNEL);
1697        struct p9_req_t *req;
1698
1699        p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1700                                                        fid->fid, request_mask);
1701
1702        if (!ret)
1703                return ERR_PTR(-ENOMEM);
1704
1705        err = 0;
1706        clnt = fid->clnt;
1707
1708        req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1709        if (IS_ERR(req)) {
1710                err = PTR_ERR(req);
1711                goto error;
1712        }
1713
1714        err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1715        if (err) {
1716                trace_9p_protocol_dump(clnt, req->rc);
1717                p9_free_req(clnt, req);
1718                goto error;
1719        }
1720
1721        p9_debug(P9_DEBUG_9P,
1722                "<<< RGETATTR st_result_mask=%lld\n"
1723                "<<< qid=%x.%llx.%x\n"
1724                "<<< st_mode=%8.8x st_nlink=%llu\n"
1725                "<<< st_uid=%d st_gid=%d\n"
1726                "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1727                "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1728                "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1729                "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1730                "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1731                "<<< st_gen=%lld st_data_version=%lld",
1732                ret->st_result_mask, ret->qid.type, ret->qid.path,
1733                ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1734                ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1735                ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1736                ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1737                ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1738                ret->st_gen, ret->st_data_version);
1739
1740        p9_free_req(clnt, req);
1741        return ret;
1742
1743error:
1744        kfree(ret);
1745        return ERR_PTR(err);
1746}
1747EXPORT_SYMBOL(p9_client_getattr_dotl);
1748
1749static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1750{
1751        int ret;
1752
1753        /* NOTE: size shouldn't include its own length */
1754        /* size[2] type[2] dev[4] qid[13] */
1755        /* mode[4] atime[4] mtime[4] length[8]*/
1756        /* name[s] uid[s] gid[s] muid[s] */
1757        ret = 2+4+13+4+4+4+8+2+2+2+2;
1758
1759        if (wst->name)
1760                ret += strlen(wst->name);
1761        if (wst->uid)
1762                ret += strlen(wst->uid);
1763        if (wst->gid)
1764                ret += strlen(wst->gid);
1765        if (wst->muid)
1766                ret += strlen(wst->muid);
1767
1768        if ((proto_version == p9_proto_2000u) ||
1769                (proto_version == p9_proto_2000L)) {
1770                ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1771                if (wst->extension)
1772                        ret += strlen(wst->extension);
1773        }
1774
1775        return ret;
1776}
1777
1778int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1779{
1780        int err;
1781        struct p9_req_t *req;
1782        struct p9_client *clnt;
1783
1784        err = 0;
1785        clnt = fid->clnt;
1786        wst->size = p9_client_statsize(wst, clnt->proto_version);
1787        p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1788        p9_debug(P9_DEBUG_9P,
1789                "     sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1790                "     mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1791                "     name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1792                "     uid=%d gid=%d n_muid=%d\n",
1793                wst->size, wst->type, wst->dev, wst->qid.type,
1794                (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1795                wst->atime, wst->mtime, (unsigned long long)wst->length,
1796                wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1797                wst->n_uid, wst->n_gid, wst->n_muid);
1798
1799        req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1800        if (IS_ERR(req)) {
1801                err = PTR_ERR(req);
1802                goto error;
1803        }
1804
1805        p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1806
1807        p9_free_req(clnt, req);
1808error:
1809        return err;
1810}
1811EXPORT_SYMBOL(p9_client_wstat);
1812
1813int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1814{
1815        int err;
1816        struct p9_req_t *req;
1817        struct p9_client *clnt;
1818
1819        err = 0;
1820        clnt = fid->clnt;
1821        p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1822        p9_debug(P9_DEBUG_9P,
1823                "    valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1824                "    atime_sec=%lld atime_nsec=%lld\n"
1825                "    mtime_sec=%lld mtime_nsec=%lld\n",
1826                p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1827                p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1828                p9attr->mtime_sec, p9attr->mtime_nsec);
1829
1830        req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1831
1832        if (IS_ERR(req)) {
1833                err = PTR_ERR(req);
1834                goto error;
1835        }
1836        p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1837        p9_free_req(clnt, req);
1838error:
1839        return err;
1840}
1841EXPORT_SYMBOL(p9_client_setattr);
1842
1843int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1844{
1845        int err;
1846        struct p9_req_t *req;
1847        struct p9_client *clnt;
1848
1849        err = 0;
1850        clnt = fid->clnt;
1851
1852        p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1853
1854        req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1855        if (IS_ERR(req)) {
1856                err = PTR_ERR(req);
1857                goto error;
1858        }
1859
1860        err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1861                &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1862                &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1863        if (err) {
1864                trace_9p_protocol_dump(clnt, req->rc);
1865                p9_free_req(clnt, req);
1866                goto error;
1867        }
1868
1869        p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1870                "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1871                "fsid %llu namelen %ld\n",
1872                fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1873                sb->blocks, sb->bfree, sb->bavail, sb->files,  sb->ffree,
1874                sb->fsid, (long int)sb->namelen);
1875
1876        p9_free_req(clnt, req);
1877error:
1878        return err;
1879}
1880EXPORT_SYMBOL(p9_client_statfs);
1881
1882int p9_client_rename(struct p9_fid *fid,
1883                     struct p9_fid *newdirfid, const char *name)
1884{
1885        int err;
1886        struct p9_req_t *req;
1887        struct p9_client *clnt;
1888
1889        err = 0;
1890        clnt = fid->clnt;
1891
1892        p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1893                        fid->fid, newdirfid->fid, name);
1894
1895        req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1896                        newdirfid->fid, name);
1897        if (IS_ERR(req)) {
1898                err = PTR_ERR(req);
1899                goto error;
1900        }
1901
1902        p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1903
1904        p9_free_req(clnt, req);
1905error:
1906        return err;
1907}
1908EXPORT_SYMBOL(p9_client_rename);
1909
1910int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1911                       struct p9_fid *newdirfid, const char *new_name)
1912{
1913        int err;
1914        struct p9_req_t *req;
1915        struct p9_client *clnt;
1916
1917        err = 0;
1918        clnt = olddirfid->clnt;
1919
1920        p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1921                   " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1922                   newdirfid->fid, new_name);
1923
1924        req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1925                            old_name, newdirfid->fid, new_name);
1926        if (IS_ERR(req)) {
1927                err = PTR_ERR(req);
1928                goto error;
1929        }
1930
1931        p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1932                   newdirfid->fid, new_name);
1933
1934        p9_free_req(clnt, req);
1935error:
1936        return err;
1937}
1938EXPORT_SYMBOL(p9_client_renameat);
1939
1940/*
1941 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1942 */
1943struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1944                                const char *attr_name, u64 *attr_size)
1945{
1946        int err;
1947        struct p9_req_t *req;
1948        struct p9_client *clnt;
1949        struct p9_fid *attr_fid;
1950
1951        err = 0;
1952        clnt = file_fid->clnt;
1953        attr_fid = p9_fid_create(clnt);
1954        if (IS_ERR(attr_fid)) {
1955                err = PTR_ERR(attr_fid);
1956                attr_fid = NULL;
1957                goto error;
1958        }
1959        p9_debug(P9_DEBUG_9P,
1960                ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1961                file_fid->fid, attr_fid->fid, attr_name);
1962
1963        req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1964                        file_fid->fid, attr_fid->fid, attr_name);
1965        if (IS_ERR(req)) {
1966                err = PTR_ERR(req);
1967                goto error;
1968        }
1969        err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1970        if (err) {
1971                trace_9p_protocol_dump(clnt, req->rc);
1972                p9_free_req(clnt, req);
1973                goto clunk_fid;
1974        }
1975        p9_free_req(clnt, req);
1976        p9_debug(P9_DEBUG_9P, "<<<  RXATTRWALK fid %d size %llu\n",
1977                attr_fid->fid, *attr_size);
1978        return attr_fid;
1979clunk_fid:
1980        p9_client_clunk(attr_fid);
1981        attr_fid = NULL;
1982error:
1983        if (attr_fid && (attr_fid != file_fid))
1984                p9_fid_destroy(attr_fid);
1985
1986        return ERR_PTR(err);
1987}
1988EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1989
1990int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1991                        u64 attr_size, int flags)
1992{
1993        int err;
1994        struct p9_req_t *req;
1995        struct p9_client *clnt;
1996
1997        p9_debug(P9_DEBUG_9P,
1998                ">>> TXATTRCREATE fid %d name  %s size %lld flag %d\n",
1999                fid->fid, name, (long long)attr_size, flags);
2000        err = 0;
2001        clnt = fid->clnt;
2002        req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2003                        fid->fid, name, attr_size, flags);
2004        if (IS_ERR(req)) {
2005                err = PTR_ERR(req);
2006                goto error;
2007        }
2008        p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2009        p9_free_req(clnt, req);
2010error:
2011        return err;
2012}
2013EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2014
2015int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2016{
2017        int err, rsize, non_zc = 0;
2018        struct p9_client *clnt;
2019        struct p9_req_t *req;
2020        char *dataptr;
2021
2022        p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2023                                fid->fid, (long long unsigned) offset, count);
2024
2025        err = 0;
2026        clnt = fid->clnt;
2027
2028        rsize = fid->iounit;
2029        if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2030                rsize = clnt->msize - P9_READDIRHDRSZ;
2031
2032        if (count < rsize)
2033                rsize = count;
2034
2035        /* Don't bother zerocopy for small IO (< 1024) */
2036        if (clnt->trans_mod->zc_request && rsize > 1024) {
2037                /*
2038                 * response header len is 11
2039                 * PDU Header(7) + IO Size (4)
2040                 */
2041                req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2042                                       11, 1, "dqd", fid->fid, offset, rsize);
2043        } else {
2044                non_zc = 1;
2045                req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2046                                    offset, rsize);
2047        }
2048        if (IS_ERR(req)) {
2049                err = PTR_ERR(req);
2050                goto error;
2051        }
2052
2053        err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2054        if (err) {
2055                trace_9p_protocol_dump(clnt, req->rc);
2056                goto free_and_error;
2057        }
2058
2059        p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2060
2061        if (non_zc)
2062                memmove(data, dataptr, count);
2063
2064        p9_free_req(clnt, req);
2065        return count;
2066
2067free_and_error:
2068        p9_free_req(clnt, req);
2069error:
2070        return err;
2071}
2072EXPORT_SYMBOL(p9_client_readdir);
2073
2074int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2075                        dev_t rdev, gid_t gid, struct p9_qid *qid)
2076{
2077        int err;
2078        struct p9_client *clnt;
2079        struct p9_req_t *req;
2080
2081        err = 0;
2082        clnt = fid->clnt;
2083        p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2084                "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2085        req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
2086                MAJOR(rdev), MINOR(rdev), gid);
2087        if (IS_ERR(req))
2088                return PTR_ERR(req);
2089
2090        err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2091        if (err) {
2092                trace_9p_protocol_dump(clnt, req->rc);
2093                goto error;
2094        }
2095        p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2096                                (unsigned long long)qid->path, qid->version);
2097
2098error:
2099        p9_free_req(clnt, req);
2100        return err;
2101
2102}
2103EXPORT_SYMBOL(p9_client_mknod_dotl);
2104
2105int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2106                                gid_t gid, struct p9_qid *qid)
2107{
2108        int err;
2109        struct p9_client *clnt;
2110        struct p9_req_t *req;
2111
2112        err = 0;
2113        clnt = fid->clnt;
2114        p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2115                 fid->fid, name, mode, gid);
2116        req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
2117                gid);
2118        if (IS_ERR(req))
2119                return PTR_ERR(req);
2120
2121        err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2122        if (err) {
2123                trace_9p_protocol_dump(clnt, req->rc);
2124                goto error;
2125        }
2126        p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2127                                (unsigned long long)qid->path, qid->version);
2128
2129error:
2130        p9_free_req(clnt, req);
2131        return err;
2132
2133}
2134EXPORT_SYMBOL(p9_client_mkdir_dotl);
2135
2136int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2137{
2138        int err;
2139        struct p9_client *clnt;
2140        struct p9_req_t *req;
2141
2142        err = 0;
2143        clnt = fid->clnt;
2144        p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2145                        "start %lld length %lld proc_id %d client_id %s\n",
2146                        fid->fid, flock->type, flock->flags, flock->start,
2147                        flock->length, flock->proc_id, flock->client_id);
2148
2149        req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2150                                flock->flags, flock->start, flock->length,
2151                                        flock->proc_id, flock->client_id);
2152
2153        if (IS_ERR(req))
2154                return PTR_ERR(req);
2155
2156        err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2157        if (err) {
2158                trace_9p_protocol_dump(clnt, req->rc);
2159                goto error;
2160        }
2161        p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2162error:
2163        p9_free_req(clnt, req);
2164        return err;
2165
2166}
2167EXPORT_SYMBOL(p9_client_lock_dotl);
2168
2169int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2170{
2171        int err;
2172        struct p9_client *clnt;
2173        struct p9_req_t *req;
2174
2175        err = 0;
2176        clnt = fid->clnt;
2177        p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2178                "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2179                glock->start, glock->length, glock->proc_id, glock->client_id);
2180
2181        req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid,  glock->type,
2182                glock->start, glock->length, glock->proc_id, glock->client_id);
2183
2184        if (IS_ERR(req))
2185                return PTR_ERR(req);
2186
2187        err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2188                        &glock->start, &glock->length, &glock->proc_id,
2189                        &glock->client_id);
2190        if (err) {
2191                trace_9p_protocol_dump(clnt, req->rc);
2192                goto error;
2193        }
2194        p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2195                "proc_id %d client_id %s\n", glock->type, glock->start,
2196                glock->length, glock->proc_id, glock->client_id);
2197error:
2198        p9_free_req(clnt, req);
2199        return err;
2200}
2201EXPORT_SYMBOL(p9_client_getlock_dotl);
2202
2203int p9_client_readlink(struct p9_fid *fid, char **target)
2204{
2205        int err;
2206        struct p9_client *clnt;
2207        struct p9_req_t *req;
2208
2209        err = 0;
2210        clnt = fid->clnt;
2211        p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2212
2213        req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2214        if (IS_ERR(req))
2215                return PTR_ERR(req);
2216
2217        err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2218        if (err) {
2219                trace_9p_protocol_dump(clnt, req->rc);
2220                goto error;
2221        }
2222        p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2223error:
2224        p9_free_req(clnt, req);
2225        return err;
2226}
2227EXPORT_SYMBOL(p9_client_readlink);
2228
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