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(const substring_t *name)
  76 {
  77         int version = -EINVAL;
  78
  79         if (!strncmp("9p2000", name->from, name->to-name->from)) {
  80                 version = p9_proto_legacy;
  81                 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
  82         } else if (!strncmp("9p2000.u", name->from, name->to-name->from)) {
  83                 version = p9_proto_2000u;
  84                 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
  85         } else if (!strncmp("9p2000.L", name->from, name->to-name->from)) {
  86                 version = p9_proto_2000L;
  87                 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
  88         } else {
  89                 P9_DPRINTK(P9_DEBUG_ERROR, "Unknown protocol version %s. ",
  90                                                         name->from);
  91         }
  92         return version;
  93 }
  94
  95 static struct p9_req_t *
  96 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
  97
  98 /**
  99  * parse_options - parse mount options into client structure
 100  * @opts: options string passed from mount
 101  * @clnt: existing v9fs client information
 102  *
 103  * Return 0 upon success, -ERRNO upon failure
 104  */
 105
 106 static int parse_opts(char *opts, struct p9_client *clnt)
 107 {
 108         char *options, *tmp_options;
 109         char *p;
 110         substring_t args[MAX_OPT_ARGS];
 111         int option;
 112         int ret = 0;
 113
 114         clnt->proto_version = p9_proto_2000u;
 115         clnt->msize = 8192;
 116
 117         if (!opts)
 118                 return 0;
 119
 120         tmp_options = kstrdup(opts, GFP_KERNEL);
 121         if (!tmp_options) {
 122                 P9_DPRINTK(P9_DEBUG_ERROR,
 123                                 "failed to allocate copy of option string\n");
 124                 return -ENOMEM;
 125         }
 126         options = tmp_options;
 127
 128         while ((p = strsep(&options, ",")) != NULL) {
 129                 int token;
 130                 if (!*p)
 131                         continue;
 132                 token = match_token(p, tokens, args);
 133                 if (token < Opt_trans) {
 134                         int r = match_int(&args[0], &option);
 135                         if (r < 0) {
 136                                 P9_DPRINTK(P9_DEBUG_ERROR,
 137                                         "integer field, but no integer?\n");
 138                                 ret = r;
 139                                 continue;
 140                         }
 141                 }
 142                 switch (token) {
 143                 case Opt_msize:
 144                         clnt->msize = option;
 145                         break;
 146                 case Opt_trans:
 147                         clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
 148                         if(clnt->trans_mod == NULL) {
 149                                 P9_DPRINTK(P9_DEBUG_ERROR,
 150                                    "Could not find request transport: %s\n",
 151                                    (char *) &args[0]);
 152                                 ret = -EINVAL;
 153                                 goto free_and_return;
 154                         }
 155                         break;
 156                 case Opt_legacy:
 157                         clnt->proto_version = p9_proto_legacy;
 158                         break;
 159                 case Opt_version:
 160                         ret = get_protocol_version(&args[0]);
 161                         if (ret == -EINVAL)
 162                                 goto free_and_return;
 163                         clnt->proto_version = ret;
 164                         break;
 165                 default:
 166                         continue;
 167                 }
 168         }
 169
 170 free_and_return:
 171         kfree(tmp_options);
 172         return ret;
 173 }
 174
 175 /**
 176  * p9_tag_alloc - lookup/allocate a request by tag
 177  * @c: client session to lookup tag within
 178  * @tag: numeric id for transaction
 179  *
 180  * this is a simple array lookup, but will grow the
 181  * request_slots as necessary to accomodate transaction
 182  * ids which did not previously have a slot.
 183  *
 184  * this code relies on the client spinlock to manage locks, its
 185  * possible we should switch to something else, but I'd rather
 186  * stick with something low-overhead for the common case.
 187  *
 188  */
 189
 190 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
 191 {
 192         unsigned long flags;
 193         int row, col;
 194         struct p9_req_t *req;
 195
 196         /* This looks up the original request by tag so we know which
 197          * buffer to read the data into */
 198         tag++;
 199
 200         if (tag >= c->max_tag) {
 201                 spin_lock_irqsave(&c->lock, flags);
 202                 /* check again since original check was outside of lock */
 203                 while (tag >= c->max_tag) {
 204                         row = (tag / P9_ROW_MAXTAG);
 205                         c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
 206                                         sizeof(struct p9_req_t), GFP_ATOMIC);
 207
 208                         if (!c->reqs[row]) {
 209                                 printk(KERN_ERR "Couldn't grow tag array\n");
 210                                 spin_unlock_irqrestore(&c->lock, flags);
 211                                 return ERR_PTR(-ENOMEM);
 212                         }
 213                         for (col = 0; col < P9_ROW_MAXTAG; col++) {
 214                                 c->reqs[row][col].status = REQ_STATUS_IDLE;
 215                                 c->reqs[row][col].tc = NULL;
 216                         }
 217                         c->max_tag += P9_ROW_MAXTAG;
 218                 }
 219                 spin_unlock_irqrestore(&c->lock, flags);
 220         }
 221         row = tag / P9_ROW_MAXTAG;
 222         col = tag % P9_ROW_MAXTAG;
 223
 224         req = &c->reqs[row][col];
 225         if (!req->tc) {
 226                 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
 227                 if (!req->wq) {
 228                         printk(KERN_ERR "Couldn't grow tag array\n");
 229                         return ERR_PTR(-ENOMEM);
 230                 }
 231                 init_waitqueue_head(req->wq);
 232                 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
 233                                                                 GFP_KERNEL);
 234                 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
 235                                                                 GFP_KERNEL);
 236                 if ((!req->tc) || (!req->rc)) {
 237                         printk(KERN_ERR "Couldn't grow tag array\n");
 238                         kfree(req->tc);
 239                         kfree(req->rc);
 240                         kfree(req->wq);
 241                         req->tc = req->rc = NULL;
 242                         req->wq = NULL;
 243                         return ERR_PTR(-ENOMEM);
 244                 }
 245                 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
 246                 req->tc->capacity = c->msize;
 247                 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
 248                 req->rc->capacity = c->msize;
 249         }
 250
 251         p9pdu_reset(req->tc);
 252         p9pdu_reset(req->rc);
 253
 254         req->tc->tag = tag-1;
 255         req->status = REQ_STATUS_ALLOC;
 256
 257         return &c->reqs[row][col];
 258 }
 259
 260 /**
 261  * p9_tag_lookup - lookup a request by tag
 262  * @c: client session to lookup tag within
 263  * @tag: numeric id for transaction
 264  *
 265  */
 266
 267 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
 268 {
 269         int row, col;
 270
 271         /* This looks up the original request by tag so we know which
 272          * buffer to read the data into */
 273         tag++;
 274
 275         BUG_ON(tag >= c->max_tag);
 276
 277         row = tag / P9_ROW_MAXTAG;
 278         col = tag % P9_ROW_MAXTAG;
 279
 280         return &c->reqs[row][col];
 281 }
 282 EXPORT_SYMBOL(p9_tag_lookup);
 283
 284 /**
 285  * p9_tag_init - setup tags structure and contents
 286  * @c:  v9fs client struct
 287  *
 288  * This initializes the tags structure for each client instance.
 289  *
 290  */
 291
 292 static int p9_tag_init(struct p9_client *c)
 293 {
 294         int err = 0;
 295
 296         c->tagpool = p9_idpool_create();
 297         if (IS_ERR(c->tagpool)) {
 298                 err = PTR_ERR(c->tagpool);
 299                 c->tagpool = NULL;
 300                 goto error;
 301         }
 302
 303         p9_idpool_get(c->tagpool); /* reserve tag 0 */
 304
 305         c->max_tag = 0;
 306 error:
 307         return err;
 308 }
 309
 310 /**
 311  * p9_tag_cleanup - cleans up tags structure and reclaims resources
 312  * @c:  v9fs client struct
 313  *
 314  * This frees resources associated with the tags structure
 315  *
 316  */
 317 static void p9_tag_cleanup(struct p9_client *c)
 318 {
 319         int row, col;
 320
 321         /* check to insure all requests are idle */
 322         for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
 323                 for (col = 0; col < P9_ROW_MAXTAG; col++) {
 324                         if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
 325                                 P9_DPRINTK(P9_DEBUG_MUX,
 326                                   "Attempting to cleanup non-free tag %d,%d\n",
 327                                   row, col);
 328                                 /* TODO: delay execution of cleanup */
 329                                 return;
 330                         }
 331                 }
 332         }
 333
 334         if (c->tagpool) {
 335                 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
 336                 p9_idpool_destroy(c->tagpool);
 337         }
 338
 339         /* free requests associated with tags */
 340         for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
 341                 for (col = 0; col < P9_ROW_MAXTAG; col++) {
 342                         kfree(c->reqs[row][col].wq);
 343                         kfree(c->reqs[row][col].tc);
 344                         kfree(c->reqs[row][col].rc);
 345                 }
 346                 kfree(c->reqs[row]);
 347         }
 348         c->max_tag = 0;
 349 }
 350
 351 /**
 352  * p9_free_req - free a request and clean-up as necessary
 353  * c: client state
 354  * r: request to release
 355  *
 356  */
 357
 358 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
 359 {
 360         int tag = r->tc->tag;
 361         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
 362
 363         r->status = REQ_STATUS_IDLE;
 364         if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
 365                 p9_idpool_put(tag, c->tagpool);
 366 }
 367
 368 /**
 369  * p9_client_cb - call back from transport to client
 370  * c: client state
 371  * req: request received
 372  *
 373  */
 374 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
 375 {
 376         P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
 377         wake_up(req->wq);
 378         P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
 379 }
 380 EXPORT_SYMBOL(p9_client_cb);
 381
 382 /**
 383  * p9_parse_header - parse header arguments out of a packet
 384  * @pdu: packet to parse
 385  * @size: size of packet
 386  * @type: type of request
 387  * @tag: tag of packet
 388  * @rewind: set if we need to rewind offset afterwards
 389  */
 390
 391 int
 392 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
 393                                                                 int rewind)
 394 {
 395         int8_t r_type;
 396         int16_t r_tag;
 397         int32_t r_size;
 398         int offset = pdu->offset;
 399         int err;
 400
 401         pdu->offset = 0;
 402         if (pdu->size == 0)
 403                 pdu->size = 7;
 404
 405         err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
 406         if (err)
 407                 goto rewind_and_exit;
 408
 409         pdu->size = r_size;
 410         pdu->id = r_type;
 411         pdu->tag = r_tag;
 412
 413         P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
 414                                                         pdu->id, pdu->tag);
 415
 416         if (type)
 417                 *type = r_type;
 418         if (tag)
 419                 *tag = r_tag;
 420         if (size)
 421                 *size = r_size;
 422
 423
 424 rewind_and_exit:
 425         if (rewind)
 426                 pdu->offset = offset;
 427         return err;
 428 }
 429 EXPORT_SYMBOL(p9_parse_header);
 430
 431 /**
 432  * p9_check_errors - check 9p packet for error return and process it
 433  * @c: current client instance
 434  * @req: request to parse and check for error conditions
 435  *
 436  * returns error code if one is discovered, otherwise returns 0
 437  *
 438  * this will have to be more complicated if we have multiple
 439  * error packet types
 440  */
 441
 442 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
 443 {
 444         int8_t type;
 445         int err;
 446
 447         err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
 448         if (err) {
 449                 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
 450                 return err;
 451         }
 452
 453         if (type == P9_RERROR || type == P9_RLERROR) {
 454                 int ecode;
 455
 456                 if (!p9_is_proto_dotl(c)) {
 457                         char *ename;
 458
 459                         err = p9pdu_readf(req->rc, c->proto_version, "s?d",
 460                                                                 &ename, &ecode);
 461                         if (err)
 462                                 goto out_err;
 463
 464                         if (p9_is_proto_dotu(c))
 465                                 err = -ecode;
 466
 467                         if (!err || !IS_ERR_VALUE(err)) {
 468                                 err = p9_errstr2errno(ename, strlen(ename));
 469
 470                                 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
 471
 472                                 kfree(ename);
 473                         }
 474                 } else {
 475                         err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
 476                         err = -ecode;
 477
 478                         P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
 479                 }
 480
 481         } else
 482                 err = 0;
 483
 484         return err;
 485
 486 out_err:
 487         P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
 488
 489         return err;
 490 }
 491
 492 /**
 493  * p9_client_flush - flush (cancel) a request
 494  * @c: client state
 495  * @oldreq: request to cancel
 496  *
 497  * This sents a flush for a particular requests and links
 498  * the flush request to the original request.  The current
 499  * code only supports a single flush request although the protocol
 500  * allows for multiple flush requests to be sent for a single request.
 501  *
 502  */
 503
 504 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
 505 {
 506         struct p9_req_t *req;
 507         int16_t oldtag;
 508         int err;
 509
 510         err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
 511         if (err)
 512                 return err;
 513
 514         P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
 515
 516         req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
 517         if (IS_ERR(req))
 518                 return PTR_ERR(req);
 519
 520
 521         /* if we haven't received a response for oldreq,
 522            remove it from the list. */
 523         spin_lock(&c->lock);
 524         if (oldreq->status == REQ_STATUS_FLSH)
 525                 list_del(&oldreq->req_list);
 526         spin_unlock(&c->lock);
 527
 528         p9_free_req(c, req);
 529         return 0;
 530 }
 531
 532 /**
 533  * p9_client_rpc - issue a request and wait for a response
 534  * @c: client session
 535  * @type: type of request
 536  * @fmt: protocol format string (see protocol.c)
 537  *
 538  * Returns request structure (which client must free using p9_free_req)
 539  */
 540
 541 static struct p9_req_t *
 542 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
 543 {
 544         va_list ap;
 545         int tag, err;
 546         struct p9_req_t *req;
 547         unsigned long flags;
 548         int sigpending;
 549
 550         P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
 551
 552         /* we allow for any status other than disconnected */
 553         if (c->status == Disconnected)
 554                 return ERR_PTR(-EIO);
 555
 556         /* if status is begin_disconnected we allow only clunk request */
 557         if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
 558                 return ERR_PTR(-EIO);
 559
 560         if (signal_pending(current)) {
 561                 sigpending = 1;
 562                 clear_thread_flag(TIF_SIGPENDING);
 563         } else
 564                 sigpending = 0;
 565
 566         tag = P9_NOTAG;
 567         if (type != P9_TVERSION) {
 568                 tag = p9_idpool_get(c->tagpool);
 569                 if (tag < 0)
 570                         return ERR_PTR(-ENOMEM);
 571         }
 572
 573         req = p9_tag_alloc(c, tag);
 574         if (IS_ERR(req))
 575                 return req;
 576
 577         /* marshall the data */
 578         p9pdu_prepare(req->tc, tag, type);
 579         va_start(ap, fmt);
 580         err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
 581         va_end(ap);
 582         p9pdu_finalize(req->tc);
 583
 584         err = c->trans_mod->request(c, req);
 585         if (err < 0) {
 586                 c->status = Disconnected;
 587                 goto reterr;
 588         }
 589
 590         P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
 591         err = wait_event_interruptible(*req->wq,
 592                                                 req->status >= REQ_STATUS_RCVD);
 593         P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
 594                                                 req->wq, tag, err);
 595
 596         if (req->status == REQ_STATUS_ERROR) {
 597                 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
 598                 err = req->t_err;
 599         }
 600
 601         if ((err == -ERESTARTSYS) && (c->status == Connected)) {
 602                 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
 603                 sigpending = 1;
 604                 clear_thread_flag(TIF_SIGPENDING);
 605
 606                 if (c->trans_mod->cancel(c, req))
 607                         p9_client_flush(c, req);
 608
 609                 /* if we received the response anyway, don't signal error */
 610                 if (req->status == REQ_STATUS_RCVD)
 611                         err = 0;
 612         }
 613
 614         if (sigpending) {
 615                 spin_lock_irqsave(&current->sighand->siglock, flags);
 616                 recalc_sigpending();
 617                 spin_unlock_irqrestore(&current->sighand->siglock, flags);
 618         }
 619
 620         if (err < 0)
 621                 goto reterr;
 622
 623         err = p9_check_errors(c, req);
 624         if (!err) {
 625                 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
 626                 return req;
 627         }
 628
 629 reterr:
 630         P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
 631                                                                         err);
 632         p9_free_req(c, req);
 633         return ERR_PTR(err);
 634 }
 635
 636 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
 637 {
 638         int ret;
 639         struct p9_fid *fid;
 640         unsigned long flags;
 641
 642         P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
 643         fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
 644         if (!fid)
 645                 return ERR_PTR(-ENOMEM);
 646
 647         ret = p9_idpool_get(clnt->fidpool);
 648         if (ret < 0) {
 649                 ret = -ENOSPC;
 650                 goto error;
 651         }
 652         fid->fid = ret;
 653
 654         memset(&fid->qid, 0, sizeof(struct p9_qid));
 655         fid->mode = -1;
 656         fid->uid = current_fsuid();
 657         fid->clnt = clnt;
 658         fid->rdir = NULL;
 659         spin_lock_irqsave(&clnt->lock, flags);
 660         list_add(&fid->flist, &clnt->fidlist);
 661         spin_unlock_irqrestore(&clnt->lock, flags);
 662
 663         return fid;
 664
 665 error:
 666         kfree(fid);
 667         return ERR_PTR(ret);
 668 }
 669
 670 static void p9_fid_destroy(struct p9_fid *fid)
 671 {
 672         struct p9_client *clnt;
 673         unsigned long flags;
 674
 675         P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
 676         clnt = fid->clnt;
 677         p9_idpool_put(fid->fid, clnt->fidpool);
 678         spin_lock_irqsave(&clnt->lock, flags);
 679         list_del(&fid->flist);
 680         spin_unlock_irqrestore(&clnt->lock, flags);
 681         kfree(fid->rdir);
 682         kfree(fid);
 683 }
 684
 685 static int p9_client_version(struct p9_client *c)
 686 {
 687         int err = 0;
 688         struct p9_req_t *req;
 689         char *version;
 690         int msize;
 691
 692         P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
 693                                                 c->msize, c->proto_version);
 694
 695         switch (c->proto_version) {
 696         case p9_proto_2000L:
 697                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 698                                         c->msize, "9P2000.L");
 699                 break;
 700         case p9_proto_2000u:
 701                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 702                                         c->msize, "9P2000.u");
 703                 break;
 704         case p9_proto_legacy:
 705                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 706                                         c->msize, "9P2000");
 707                 break;
 708         default:
 709                 return -EINVAL;
 710                 break;
 711         }
 712
 713         if (IS_ERR(req))
 714                 return PTR_ERR(req);
 715
 716         err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
 717         if (err) {
 718                 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
 719                 p9pdu_dump(1, req->rc);
 720                 goto error;
 721         }
 722
 723         P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
 724         if (!strncmp(version, "9P2000.L", 8))
 725                 c->proto_version = p9_proto_2000L;
 726         else if (!strncmp(version, "9P2000.u", 8))
 727                 c->proto_version = p9_proto_2000u;
 728         else if (!strncmp(version, "9P2000", 6))
 729                 c->proto_version = p9_proto_legacy;
 730         else {
 731                 err = -EREMOTEIO;
 732                 goto error;
 733         }
 734
 735         if (msize < c->msize)
 736                 c->msize = msize;
 737
 738 error:
 739         kfree(version);
 740         p9_free_req(c, req);
 741
 742         return err;
 743 }
 744
 745 struct p9_client *p9_client_create(const char *dev_name, char *options)
 746 {
 747         int err;
 748         struct p9_client *clnt;
 749
 750         err = 0;
 751         clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
 752         if (!clnt)
 753                 return ERR_PTR(-ENOMEM);
 754
 755         clnt->trans_mod = NULL;
 756         clnt->trans = NULL;
 757         spin_lock_init(&clnt->lock);
 758         INIT_LIST_HEAD(&clnt->fidlist);
 759
 760         p9_tag_init(clnt);
 761
 762         err = parse_opts(options, clnt);
 763         if (err < 0)
 764                 goto free_client;
 765
 766         if (!clnt->trans_mod)
 767                 clnt->trans_mod = v9fs_get_default_trans();
 768
 769         if (clnt->trans_mod == NULL) {
 770                 err = -EPROTONOSUPPORT;
 771                 P9_DPRINTK(P9_DEBUG_ERROR,
 772                                 "No transport defined or default transport\n");
 773                 goto free_client;
 774         }
 775
 776         clnt->fidpool = p9_idpool_create();
 777         if (IS_ERR(clnt->fidpool)) {
 778                 err = PTR_ERR(clnt->fidpool);
 779                 clnt->fidpool = NULL;
 780                 goto put_trans;
 781         }
 782
 783         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
 784                 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
 785
 786         err = clnt->trans_mod->create(clnt, dev_name, options);
 787         if (err)
 788                 goto destroy_fidpool;
 789
 790         if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
 791                 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
 792
 793         err = p9_client_version(clnt);
 794         if (err)
 795                 goto close_trans;
 796
 797         return clnt;
 798
 799 close_trans:
 800         clnt->trans_mod->close(clnt);
 801 destroy_fidpool:
 802         p9_idpool_destroy(clnt->fidpool);
 803 put_trans:
 804         v9fs_put_trans(clnt->trans_mod);
 805 free_client:
 806         kfree(clnt);
 807         return ERR_PTR(err);
 808 }
 809 EXPORT_SYMBOL(p9_client_create);
 810
 811 void p9_client_destroy(struct p9_client *clnt)
 812 {
 813         struct p9_fid *fid, *fidptr;
 814
 815         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
 816
 817         if (clnt->trans_mod)
 818                 clnt->trans_mod->close(clnt);
 819
 820         v9fs_put_trans(clnt->trans_mod);
 821
 822         list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
 823                 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
 824                 p9_fid_destroy(fid);
 825         }
 826
 827         if (clnt->fidpool)
 828                 p9_idpool_destroy(clnt->fidpool);
 829
 830         p9_tag_cleanup(clnt);
 831
 832         kfree(clnt);
 833 }
 834 EXPORT_SYMBOL(p9_client_destroy);
 835
 836 void p9_client_disconnect(struct p9_client *clnt)
 837 {
 838         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
 839         clnt->status = Disconnected;
 840 }
 841 EXPORT_SYMBOL(p9_client_disconnect);
 842
 843 void p9_client_begin_disconnect(struct p9_client *clnt)
 844 {
 845         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
 846         clnt->status = BeginDisconnect;
 847 }
 848 EXPORT_SYMBOL(p9_client_begin_disconnect);
 849
 850 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
 851         char *uname, u32 n_uname, char *aname)
 852 {
 853         int err;
 854         struct p9_req_t *req;
 855         struct p9_fid *fid;
 856         struct p9_qid qid;
 857
 858         P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
 859                                         afid ? afid->fid : -1, uname, aname);
 860         err = 0;
 861
 862         fid = p9_fid_create(clnt);
 863         if (IS_ERR(fid)) {
 864                 err = PTR_ERR(fid);
 865                 fid = NULL;
 866                 goto error;
 867         }
 868
 869         req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
 870                         afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
 871         if (IS_ERR(req)) {
 872                 err = PTR_ERR(req);
 873                 goto error;
 874         }
 875
 876         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
 877         if (err) {
 878                 p9pdu_dump(1, req->rc);
 879                 p9_free_req(clnt, req);
 880                 goto error;
 881         }
 882
 883         P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
 884                                         qid.type,
 885                                         (unsigned long long)qid.path,
 886                                         qid.version);
 887
 888         memmove(&fid->qid, &qid, sizeof(struct p9_qid));
 889
 890         p9_free_req(clnt, req);
 891         return fid;
 892
 893 error:
 894         if (fid)
 895                 p9_fid_destroy(fid);
 896         return ERR_PTR(err);
 897 }
 898 EXPORT_SYMBOL(p9_client_attach);
 899
 900 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
 901         int clone)
 902 {
 903         int err;
 904         struct p9_client *clnt;
 905         struct p9_fid *fid;
 906         struct p9_qid *wqids;
 907         struct p9_req_t *req;
 908         int16_t nwqids, count;
 909
 910         err = 0;
 911         wqids = NULL;
 912         clnt = oldfid->clnt;
 913         if (clone) {
 914                 fid = p9_fid_create(clnt);
 915                 if (IS_ERR(fid)) {
 916                         err = PTR_ERR(fid);
 917                         fid = NULL;
 918                         goto error;
 919                 }
 920
 921                 fid->uid = oldfid->uid;
 922         } else
 923                 fid = oldfid;
 924
 925
 926         P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
 927                 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
 928
 929         req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
 930                                                                 nwname, wnames);
 931         if (IS_ERR(req)) {
 932                 err = PTR_ERR(req);
 933                 goto error;
 934         }
 935
 936         err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
 937         if (err) {
 938                 p9pdu_dump(1, req->rc);
 939                 p9_free_req(clnt, req);
 940                 goto clunk_fid;
 941         }
 942         p9_free_req(clnt, req);
 943
 944         P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
 945
 946         if (nwqids != nwname) {
 947                 err = -ENOENT;
 948                 goto clunk_fid;
 949         }
 950
 951         for (count = 0; count < nwqids; count++)
 952                 P9_DPRINTK(P9_DEBUG_9P, "<<<     [%d] %x.%llx.%x\n",
 953                         count, wqids[count].type,
 954                         (unsigned long long)wqids[count].path,
 955                         wqids[count].version);
 956
 957         if (nwname)
 958                 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
 959         else
 960                 fid->qid = oldfid->qid;
 961
 962         kfree(wqids);
 963         return fid;
 964
 965 clunk_fid:
 966         kfree(wqids);
 967         p9_client_clunk(fid);
 968         fid = NULL;
 969
 970 error:
 971         if (fid && (fid != oldfid))
 972                 p9_fid_destroy(fid);
 973
 974         return ERR_PTR(err);
 975 }
 976 EXPORT_SYMBOL(p9_client_walk);
 977
 978 int p9_client_open(struct p9_fid *fid, int mode)
 979 {
 980         int err;
 981         struct p9_client *clnt;
 982         struct p9_req_t *req;
 983         struct p9_qid qid;
 984         int iounit;
 985
 986         clnt = fid->clnt;
 987         P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
 988                 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
 989         err = 0;
 990
 991         if (fid->mode != -1)
 992                 return -EINVAL;
 993
 994         if (p9_is_proto_dotl(clnt))
 995                 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
 996         else
 997                 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
 998         if (IS_ERR(req)) {
 999                 err = PTR_ERR(req);
1000                 goto error;
1001         }
1002
1003         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1004         if (err) {
1005                 p9pdu_dump(1, req->rc);
1006                 goto free_and_error;
1007         }
1008
1009         P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1010                 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN",  qid.type,
1011                 (unsigned long long)qid.path, qid.version, iounit);
1012
1013         fid->mode = mode;
1014         fid->iounit = iounit;
1015
1016 free_and_error:
1017         p9_free_req(clnt, req);
1018 error:
1019         return err;
1020 }
1021 EXPORT_SYMBOL(p9_client_open);
1022
1023 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1024                 gid_t gid, struct p9_qid *qid)
1025 {
1026         int err = 0;
1027         struct p9_client *clnt;
1028         struct p9_req_t *req;
1029         int iounit;
1030
1031         P9_DPRINTK(P9_DEBUG_9P,
1032                         ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1033                         ofid->fid, name, flags, mode, gid);
1034         clnt = ofid->clnt;
1035
1036         if (ofid->mode != -1)
1037                 return -EINVAL;
1038
1039         req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1040                         mode, gid);
1041         if (IS_ERR(req)) {
1042                 err = PTR_ERR(req);
1043                 goto error;
1044         }
1045
1046         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1047         if (err) {
1048                 p9pdu_dump(1, req->rc);
1049                 goto free_and_error;
1050         }
1051
1052         P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1053                         qid->type,
1054                         (unsigned long long)qid->path,
1055                         qid->version, iounit);
1056
1057         ofid->mode = mode;
1058         ofid->iounit = iounit;
1059
1060 free_and_error:
1061         p9_free_req(clnt, req);
1062 error:
1063         return err;
1064 }
1065 EXPORT_SYMBOL(p9_client_create_dotl);
1066
1067 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1068                      char *extension)
1069 {
1070         int err;
1071         struct p9_client *clnt;
1072         struct p9_req_t *req;
1073         struct p9_qid qid;
1074         int iounit;
1075
1076         P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1077                                                 fid->fid, name, perm, mode);
1078         err = 0;
1079         clnt = fid->clnt;
1080
1081         if (fid->mode != -1)
1082                 return -EINVAL;
1083
1084         req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1085                                 mode, extension);
1086         if (IS_ERR(req)) {
1087                 err = PTR_ERR(req);
1088                 goto error;
1089         }
1090
1091         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1092         if (err) {
1093                 p9pdu_dump(1, req->rc);
1094                 goto free_and_error;
1095         }
1096
1097         P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1098                                 qid.type,
1099                                 (unsigned long long)qid.path,
1100                                 qid.version, iounit);
1101
1102         fid->mode = mode;
1103         fid->iounit = iounit;
1104
1105 free_and_error:
1106         p9_free_req(clnt, req);
1107 error:
1108         return err;
1109 }
1110 EXPORT_SYMBOL(p9_client_fcreate);
1111
1112 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1113                 struct p9_qid *qid)
1114 {
1115         int err = 0;
1116         struct p9_client *clnt;
1117         struct p9_req_t *req;
1118
1119         P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s  symtgt %s\n",
1120                         dfid->fid, name, symtgt);
1121         clnt = dfid->clnt;
1122
1123         req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1124                         gid);
1125         if (IS_ERR(req)) {
1126                 err = PTR_ERR(req);
1127                 goto error;
1128         }
1129
1130         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1131         if (err) {
1132                 p9pdu_dump(1, req->rc);
1133                 goto free_and_error;
1134         }
1135
1136         P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1137                         qid->type, (unsigned long long)qid->path, qid->version);
1138
1139 free_and_error:
1140         p9_free_req(clnt, req);
1141 error:
1142         return err;
1143 }
1144 EXPORT_SYMBOL(p9_client_symlink);
1145
1146 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1147 {
1148         struct p9_client *clnt;
1149         struct p9_req_t *req;
1150
1151         P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1152                         dfid->fid, oldfid->fid, newname);
1153         clnt = dfid->clnt;
1154         req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1155                         newname);
1156         if (IS_ERR(req))
1157                 return PTR_ERR(req);
1158
1159         P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1160         p9_free_req(clnt, req);
1161         return 0;
1162 }
1163 EXPORT_SYMBOL(p9_client_link);
1164
1165 int p9_client_fsync(struct p9_fid *fid)
1166 {
1167         int err;
1168         struct p9_client *clnt;
1169         struct p9_req_t *req;
1170
1171         P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d\n", fid->fid);
1172         err = 0;
1173         clnt = fid->clnt;
1174
1175         req = p9_client_rpc(clnt, P9_TFSYNC, "d", fid->fid);
1176         if (IS_ERR(req)) {
1177                 err = PTR_ERR(req);
1178                 goto error;
1179         }
1180
1181         P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1182
1183         p9_free_req(clnt, req);
1184
1185 error:
1186         return err;
1187 }
1188 EXPORT_SYMBOL(p9_client_fsync);
1189
1190 int p9_client_clunk(struct p9_fid *fid)
1191 {
1192         int err;
1193         struct p9_client *clnt;
1194         struct p9_req_t *req;
1195
1196         if (!fid) {
1197                 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1198                 dump_stack();
1199                 return 0;
1200         }
1201
1202         P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1203         err = 0;
1204         clnt = fid->clnt;
1205
1206         req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1207         if (IS_ERR(req)) {
1208                 err = PTR_ERR(req);
1209                 goto error;
1210         }
1211
1212         P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1213
1214         p9_free_req(clnt, req);
1215         p9_fid_destroy(fid);
1216
1217 error:
1218         return err;
1219 }
1220 EXPORT_SYMBOL(p9_client_clunk);
1221
1222 int p9_client_remove(struct p9_fid *fid)
1223 {
1224         int err;
1225         struct p9_client *clnt;
1226         struct p9_req_t *req;
1227
1228         P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1229         err = 0;
1230         clnt = fid->clnt;
1231
1232         req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1233         if (IS_ERR(req)) {
1234                 err = PTR_ERR(req);
1235                 goto error;
1236         }
1237
1238         P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1239
1240         p9_free_req(clnt, req);
1241 error:
1242         p9_fid_destroy(fid);
1243         return err;
1244 }
1245 EXPORT_SYMBOL(p9_client_remove);
1246
1247 int
1248 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1249                                                                 u32 count)
1250 {
1251         int err, rsize, total;
1252         struct p9_client *clnt;
1253         struct p9_req_t *req;
1254         char *dataptr;
1255
1256         P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1257                                         (long long unsigned) offset, count);
1258         err = 0;
1259         clnt = fid->clnt;
1260         total = 0;
1261
1262         rsize = fid->iounit;
1263         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1264                 rsize = clnt->msize - P9_IOHDRSZ;
1265
1266         if (count < rsize)
1267                 rsize = count;
1268
1269         req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1270         if (IS_ERR(req)) {
1271                 err = PTR_ERR(req);
1272                 goto error;
1273         }
1274
1275         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1276         if (err) {
1277                 p9pdu_dump(1, req->rc);
1278                 goto free_and_error;
1279         }
1280
1281         P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1282
1283         if (data) {
1284                 memmove(data, dataptr, count);
1285         }
1286
1287         if (udata) {
1288                 err = copy_to_user(udata, dataptr, count);
1289                 if (err) {
1290                         err = -EFAULT;
1291                         goto free_and_error;
1292                 }
1293         }
1294
1295         p9_free_req(clnt, req);
1296         return count;
1297
1298 free_and_error:
1299         p9_free_req(clnt, req);
1300 error:
1301         return err;
1302 }
1303 EXPORT_SYMBOL(p9_client_read);
1304
1305 int
1306 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1307                                                         u64 offset, u32 count)
1308 {
1309         int err, rsize, total;
1310         struct p9_client *clnt;
1311         struct p9_req_t *req;
1312
1313         P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1314                                 fid->fid, (long long unsigned) offset, count);
1315         err = 0;
1316         clnt = fid->clnt;
1317         total = 0;
1318
1319         rsize = fid->iounit;
1320         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1321                 rsize = clnt->msize - P9_IOHDRSZ;
1322
1323         if (count < rsize)
1324                 rsize = count;
1325         if (data)
1326                 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1327                                                                 rsize, data);
1328         else
1329                 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1330                                                                 rsize, udata);
1331         if (IS_ERR(req)) {
1332                 err = PTR_ERR(req);
1333                 goto error;
1334         }
1335
1336         err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1337         if (err) {
1338                 p9pdu_dump(1, req->rc);
1339                 goto free_and_error;
1340         }
1341
1342         P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1343
1344         p9_free_req(clnt, req);
1345         return count;
1346
1347 free_and_error:
1348         p9_free_req(clnt, req);
1349 error:
1350         return err;
1351 }
1352 EXPORT_SYMBOL(p9_client_write);
1353
1354 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1355 {
1356         int err;
1357         struct p9_client *clnt;
1358         struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1359         struct p9_req_t *req;
1360         u16 ignored;
1361
1362         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1363
1364         if (!ret)
1365                 return ERR_PTR(-ENOMEM);
1366
1367         err = 0;
1368         clnt = fid->clnt;
1369
1370         req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1371         if (IS_ERR(req)) {
1372                 err = PTR_ERR(req);
1373                 goto error;
1374         }
1375
1376         err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1377         if (err) {
1378                 p9pdu_dump(1, req->rc);
1379                 p9_free_req(clnt, req);
1380                 goto error;
1381         }
1382
1383         P9_DPRINTK(P9_DEBUG_9P,
1384                 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1385                 "<<<    mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1386                 "<<<    name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1387                 "<<<    uid=%d gid=%d n_muid=%d\n",
1388                 ret->size, ret->type, ret->dev, ret->qid.type,
1389                 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1390                 ret->atime, ret->mtime, (unsigned long long)ret->length,
1391                 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1392                 ret->n_uid, ret->n_gid, ret->n_muid);
1393
1394         p9_free_req(clnt, req);
1395         return ret;
1396
1397 error:
1398         kfree(ret);
1399         return ERR_PTR(err);
1400 }
1401 EXPORT_SYMBOL(p9_client_stat);
1402
1403 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1404                                                         u64 request_mask)
1405 {
1406         int err;
1407         struct p9_client *clnt;
1408         struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1409                                                                 GFP_KERNEL);
1410         struct p9_req_t *req;
1411
1412         P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1413                                                         fid->fid, request_mask);
1414
1415         if (!ret)
1416                 return ERR_PTR(-ENOMEM);
1417
1418         err = 0;
1419         clnt = fid->clnt;
1420
1421         req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1422         if (IS_ERR(req)) {
1423                 err = PTR_ERR(req);
1424                 goto error;
1425         }
1426
1427         err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1428         if (err) {
1429                 p9pdu_dump(1, req->rc);
1430                 p9_free_req(clnt, req);
1431                 goto error;
1432         }
1433
1434         P9_DPRINTK(P9_DEBUG_9P,
1435                 "<<< RGETATTR st_result_mask=%lld\n"
1436                 "<<< qid=%x.%llx.%x\n"
1437                 "<<< st_mode=%8.8x st_nlink=%llu\n"
1438                 "<<< st_uid=%d st_gid=%d\n"
1439                 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1440                 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1441                 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1442                 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1443                 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1444                 "<<< st_gen=%lld st_data_version=%lld",
1445                 ret->st_result_mask, ret->qid.type, ret->qid.path,
1446                 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1447                 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1448                 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1449                 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1450                 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1451                 ret->st_gen, ret->st_data_version);
1452
1453         p9_free_req(clnt, req);
1454         return ret;
1455
1456 error:
1457         kfree(ret);
1458         return ERR_PTR(err);
1459 }
1460 EXPORT_SYMBOL(p9_client_getattr_dotl);
1461
1462 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1463 {
1464         int ret;
1465
1466         /* NOTE: size shouldn't include its own length */
1467         /* size[2] type[2] dev[4] qid[13] */
1468         /* mode[4] atime[4] mtime[4] length[8]*/
1469         /* name[s] uid[s] gid[s] muid[s] */
1470         ret = 2+4+13+4+4+4+8+2+2+2+2;
1471
1472         if (wst->name)
1473                 ret += strlen(wst->name);
1474         if (wst->uid)
1475                 ret += strlen(wst->uid);
1476         if (wst->gid)
1477                 ret += strlen(wst->gid);
1478         if (wst->muid)
1479                 ret += strlen(wst->muid);
1480
1481         if ((proto_version == p9_proto_2000u) ||
1482                 (proto_version == p9_proto_2000L)) {
1483                 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1484                 if (wst->extension)
1485                         ret += strlen(wst->extension);
1486         }
1487
1488         return ret;
1489 }
1490
1491 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1492 {
1493         int err;
1494         struct p9_req_t *req;
1495         struct p9_client *clnt;
1496
1497         err = 0;
1498         clnt = fid->clnt;
1499         wst->size = p9_client_statsize(wst, clnt->proto_version);
1500         P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1501         P9_DPRINTK(P9_DEBUG_9P,
1502                 "     sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1503                 "     mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1504                 "     name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1505                 "     uid=%d gid=%d n_muid=%d\n",
1506                 wst->size, wst->type, wst->dev, wst->qid.type,
1507                 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1508                 wst->atime, wst->mtime, (unsigned long long)wst->length,
1509                 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1510                 wst->n_uid, wst->n_gid, wst->n_muid);
1511
1512         req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1513         if (IS_ERR(req)) {
1514                 err = PTR_ERR(req);
1515                 goto error;
1516         }
1517
1518         P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1519
1520         p9_free_req(clnt, req);
1521 error:
1522         return err;
1523 }
1524 EXPORT_SYMBOL(p9_client_wstat);
1525
1526 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1527 {
1528         int err;
1529         struct p9_req_t *req;
1530         struct p9_client *clnt;
1531
1532         err = 0;
1533         clnt = fid->clnt;
1534         P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1535         P9_DPRINTK(P9_DEBUG_9P,
1536                 "    valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1537                 "    atime_sec=%lld atime_nsec=%lld\n"
1538                 "    mtime_sec=%lld mtime_nsec=%lld\n",
1539                 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1540                 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1541                 p9attr->mtime_sec, p9attr->mtime_nsec);
1542
1543         req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1544
1545         if (IS_ERR(req)) {
1546                 err = PTR_ERR(req);
1547                 goto error;
1548         }
1549         P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1550         p9_free_req(clnt, req);
1551 error:
1552         return err;
1553 }
1554 EXPORT_SYMBOL(p9_client_setattr);
1555
1556 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1557 {
1558         int err;
1559         struct p9_req_t *req;
1560         struct p9_client *clnt;
1561
1562         err = 0;
1563         clnt = fid->clnt;
1564
1565         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1566
1567         req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1568         if (IS_ERR(req)) {
1569                 err = PTR_ERR(req);
1570                 goto error;
1571         }
1572
1573         err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1574                 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1575                 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1576         if (err) {
1577                 p9pdu_dump(1, req->rc);
1578                 p9_free_req(clnt, req);
1579                 goto error;
1580         }
1581
1582         P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1583                 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1584                 "fsid %llu namelen %ld\n",
1585                 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1586                 sb->blocks, sb->bfree, sb->bavail, sb->files,  sb->ffree,
1587                 sb->fsid, (long int)sb->namelen);
1588
1589         p9_free_req(clnt, req);
1590 error:
1591         return err;
1592 }
1593 EXPORT_SYMBOL(p9_client_statfs);
1594
1595 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name)
1596 {
1597         int err;
1598         struct p9_req_t *req;
1599         struct p9_client *clnt;
1600
1601         err = 0;
1602         clnt = fid->clnt;
1603
1604         P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1605                         fid->fid, newdirfid->fid, name);
1606
1607         req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1608                         newdirfid->fid, name);
1609         if (IS_ERR(req)) {
1610                 err = PTR_ERR(req);
1611                 goto error;
1612         }
1613
1614         P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1615
1616         p9_free_req(clnt, req);
1617 error:
1618         return err;
1619 }
1620 EXPORT_SYMBOL(p9_client_rename);
1621
1622 /*
1623  * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1624  */
1625 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1626                                 const char *attr_name, u64 *attr_size)
1627 {
1628         int err;
1629         struct p9_req_t *req;
1630         struct p9_client *clnt;
1631         struct p9_fid *attr_fid;
1632
1633         err = 0;
1634         clnt = file_fid->clnt;
1635         attr_fid = p9_fid_create(clnt);
1636         if (IS_ERR(attr_fid)) {
1637                 err = PTR_ERR(attr_fid);
1638                 attr_fid = NULL;
1639                 goto error;
1640         }
1641         P9_DPRINTK(P9_DEBUG_9P,
1642                 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1643                 file_fid->fid, attr_fid->fid, attr_name);
1644
1645         req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1646                         file_fid->fid, attr_fid->fid, attr_name);
1647         if (IS_ERR(req)) {
1648                 err = PTR_ERR(req);
1649                 goto error;
1650         }
1651         err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1652         if (err) {
1653                 p9pdu_dump(1, req->rc);
1654                 p9_free_req(clnt, req);
1655                 goto clunk_fid;
1656         }
1657         p9_free_req(clnt, req);
1658         P9_DPRINTK(P9_DEBUG_9P, "<<<  RXATTRWALK fid %d size %llu\n",
1659                 attr_fid->fid, *attr_size);
1660         return attr_fid;
1661 clunk_fid:
1662         p9_client_clunk(attr_fid);
1663         attr_fid = NULL;
1664 error:
1665         if (attr_fid && (attr_fid != file_fid))
1666                 p9_fid_destroy(attr_fid);
1667
1668         return ERR_PTR(err);
1669 }
1670 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1671
1672 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1673                         u64 attr_size, int flags)
1674 {
1675         int err;
1676         struct p9_req_t *req;
1677         struct p9_client *clnt;
1678
1679         P9_DPRINTK(P9_DEBUG_9P,
1680                 ">>> TXATTRCREATE fid %d name  %s size %lld flag %d\n",
1681                 fid->fid, name, (long long)attr_size, flags);
1682         err = 0;
1683         clnt = fid->clnt;
1684         req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1685                         fid->fid, name, attr_size, flags);
1686         if (IS_ERR(req)) {
1687                 err = PTR_ERR(req);
1688                 goto error;
1689         }
1690         P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
1691         p9_free_req(clnt, req);
1692 error:
1693         return err;
1694 }
1695 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
1696
1697 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
1698 {
1699         int err, rsize, total;
1700         struct p9_client *clnt;
1701         struct p9_req_t *req;
1702         char *dataptr;
1703
1704         P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
1705                                 fid->fid, (long long unsigned) offset, count);
1706
1707         err = 0;
1708         clnt = fid->clnt;
1709         total = 0;
1710
1711         rsize = fid->iounit;
1712         if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
1713                 rsize = clnt->msize - P9_READDIRHDRSZ;
1714
1715         if (count < rsize)
1716                 rsize = count;
1717
1718         req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, offset, rsize);
1719         if (IS_ERR(req)) {
1720                 err = PTR_ERR(req);
1721                 goto error;
1722         }
1723
1724         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1725         if (err) {
1726                 p9pdu_dump(1, req->rc);
1727                 goto free_and_error;
1728         }
1729
1730         P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
1731
1732         if (data)
1733                 memmove(data, dataptr, count);
1734
1735         p9_free_req(clnt, req);
1736         return count;
1737
1738 free_and_error:
1739         p9_free_req(clnt, req);
1740 error:
1741         return err;
1742 }
1743 EXPORT_SYMBOL(p9_client_readdir);
1744
1745 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
1746                         dev_t rdev, gid_t gid, struct p9_qid *qid)
1747 {
1748         int err;
1749         struct p9_client *clnt;
1750         struct p9_req_t *req;
1751
1752         err = 0;
1753         clnt = fid->clnt;
1754         P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
1755                 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
1756         req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
1757                 MAJOR(rdev), MINOR(rdev), gid);
1758         if (IS_ERR(req))
1759                 return PTR_ERR(req);
1760
1761         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1762         if (err) {
1763                 p9pdu_dump(1, req->rc);
1764                 goto error;
1765         }
1766         P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
1767                                 (unsigned long long)qid->path, qid->version);
1768
1769 error:
1770         p9_free_req(clnt, req);
1771         return err;
1772
1773 }
1774 EXPORT_SYMBOL(p9_client_mknod_dotl);
1775
1776 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
1777                                 gid_t gid, struct p9_qid *qid)
1778 {
1779         int err;
1780         struct p9_client *clnt;
1781         struct p9_req_t *req;
1782
1783         err = 0;
1784         clnt = fid->clnt;
1785         P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
1786                  fid->fid, name, mode, gid);
1787         req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
1788                 gid);
1789         if (IS_ERR(req))
1790                 return PTR_ERR(req);
1791
1792         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1793         if (err) {
1794                 p9pdu_dump(1, req->rc);
1795                 goto error;
1796         }
1797         P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
1798                                 (unsigned long long)qid->path, qid->version);
1799
1800 error:
1801         p9_free_req(clnt, req);
1802         return err;
1803
1804 }
1805 EXPORT_SYMBOL(p9_client_mkdir_dotl);
1806
1807 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
1808 {
1809         int err;
1810         struct p9_client *clnt;
1811         struct p9_req_t *req;
1812
1813         err = 0;
1814         clnt = fid->clnt;
1815         P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
1816                         "start %lld length %lld proc_id %d client_id %s\n",
1817                         fid->fid, flock->type, flock->flags, flock->start,
1818                         flock->length, flock->proc_id, flock->client_id);
1819
1820         req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
1821                                 flock->flags, flock->start, flock->length,
1822                                         flock->proc_id, flock->client_id);
1823
1824         if (IS_ERR(req))
1825                 return PTR_ERR(req);
1826
1827         err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
1828         if (err) {
1829                 p9pdu_dump(1, req->rc);
1830                 goto error;
1831         }
1832         P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
1833 error:
1834         p9_free_req(clnt, req);
1835         return err;
1836
1837 }
1838 EXPORT_SYMBOL(p9_client_lock_dotl);
1839
1840 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
1841 {
1842         int err;
1843         struct p9_client *clnt;
1844         struct p9_req_t *req;
1845
1846         err = 0;
1847         clnt = fid->clnt;
1848         P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
1849                 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
1850                 glock->start, glock->length, glock->proc_id, glock->client_id);
1851
1852         req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid,  glock->type,
1853                 glock->start, glock->length, glock->proc_id, glock->client_id);
1854
1855         if (IS_ERR(req))
1856                 return PTR_ERR(req);
1857
1858         err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
1859                         &glock->start, &glock->length, &glock->proc_id,
1860                         &glock->client_id);
1861         if (err) {
1862                 p9pdu_dump(1, req->rc);
1863                 goto error;
1864         }
1865         P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
1866                 "proc_id %d client_id %s\n", glock->type, glock->start,
1867                 glock->length, glock->proc_id, glock->client_id);
1868 error:
1869         p9_free_req(clnt, req);
1870         return err;
1871 }
1872 EXPORT_SYMBOL(p9_client_getlock_dotl);
1873
1874 int p9_client_readlink(struct p9_fid *fid, char **target)
1875 {
1876         int err;
1877         struct p9_client *clnt;
1878         struct p9_req_t *req;
1879
1880         err = 0;
1881         clnt = fid->clnt;
1882         P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
1883
1884         req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
1885         if (IS_ERR(req))
1886                 return PTR_ERR(req);
1887
1888         err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
1889         if (err) {
1890                 p9pdu_dump(1, req->rc);
1891                 goto error;
1892         }
1893         P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
1894 error:
1895         p9_free_req(clnt, req);
1896         return err;
1897 }
1898 EXPORT_SYMBOL(p9_client_readlink);