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_destroy(c->tagpool);
 336
 337         /* free requests associated with tags */
 338         for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
 339                 for (col = 0; col < P9_ROW_MAXTAG; col++) {
 340                         kfree(c->reqs[row][col].wq);
 341                         kfree(c->reqs[row][col].tc);
 342                         kfree(c->reqs[row][col].rc);
 343                 }
 344                 kfree(c->reqs[row]);
 345         }
 346         c->max_tag = 0;
 347 }
 348
 349 /**
 350  * p9_free_req - free a request and clean-up as necessary
 351  * c: client state
 352  * r: request to release
 353  *
 354  */
 355
 356 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
 357 {
 358         int tag = r->tc->tag;
 359         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
 360
 361         r->status = REQ_STATUS_IDLE;
 362         if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
 363                 p9_idpool_put(tag, c->tagpool);
 364 }
 365
 366 /**
 367  * p9_client_cb - call back from transport to client
 368  * c: client state
 369  * req: request received
 370  *
 371  */
 372 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
 373 {
 374         P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
 375         wake_up(req->wq);
 376         P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
 377 }
 378 EXPORT_SYMBOL(p9_client_cb);
 379
 380 /**
 381  * p9_parse_header - parse header arguments out of a packet
 382  * @pdu: packet to parse
 383  * @size: size of packet
 384  * @type: type of request
 385  * @tag: tag of packet
 386  * @rewind: set if we need to rewind offset afterwards
 387  */
 388
 389 int
 390 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
 391                                                                 int rewind)
 392 {
 393         int8_t r_type;
 394         int16_t r_tag;
 395         int32_t r_size;
 396         int offset = pdu->offset;
 397         int err;
 398
 399         pdu->offset = 0;
 400         if (pdu->size == 0)
 401                 pdu->size = 7;
 402
 403         err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
 404         if (err)
 405                 goto rewind_and_exit;
 406
 407         pdu->size = r_size;
 408         pdu->id = r_type;
 409         pdu->tag = r_tag;
 410
 411         P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
 412                                                         pdu->id, pdu->tag);
 413
 414         if (type)
 415                 *type = r_type;
 416         if (tag)
 417                 *tag = r_tag;
 418         if (size)
 419                 *size = r_size;
 420
 421
 422 rewind_and_exit:
 423         if (rewind)
 424                 pdu->offset = offset;
 425         return err;
 426 }
 427 EXPORT_SYMBOL(p9_parse_header);
 428
 429 /**
 430  * p9_check_errors - check 9p packet for error return and process it
 431  * @c: current client instance
 432  * @req: request to parse and check for error conditions
 433  *
 434  * returns error code if one is discovered, otherwise returns 0
 435  *
 436  * this will have to be more complicated if we have multiple
 437  * error packet types
 438  */
 439
 440 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
 441 {
 442         int8_t type;
 443         int err;
 444
 445         err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
 446         if (err) {
 447                 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
 448                 return err;
 449         }
 450
 451         if (type == P9_RERROR) {
 452                 int ecode;
 453                 char *ename;
 454
 455                 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
 456                                                         &ename, &ecode);
 457                 if (err) {
 458                         P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
 459                                                                         err);
 460                         return err;
 461                 }
 462
 463                 if (p9_is_proto_dotu(c))
 464                         err = -ecode;
 465
 466                 if (!err || !IS_ERR_VALUE(err))
 467                         err = p9_errstr2errno(ename, strlen(ename));
 468
 469                 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
 470
 471                 kfree(ename);
 472         } else
 473                 err = 0;
 474
 475         return err;
 476 }
 477
 478 /**
 479  * p9_client_flush - flush (cancel) a request
 480  * @c: client state
 481  * @oldreq: request to cancel
 482  *
 483  * This sents a flush for a particular requests and links
 484  * the flush request to the original request.  The current
 485  * code only supports a single flush request although the protocol
 486  * allows for multiple flush requests to be sent for a single request.
 487  *
 488  */
 489
 490 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
 491 {
 492         struct p9_req_t *req;
 493         int16_t oldtag;
 494         int err;
 495
 496         err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
 497         if (err)
 498                 return err;
 499
 500         P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
 501
 502         req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
 503         if (IS_ERR(req))
 504                 return PTR_ERR(req);
 505
 506
 507         /* if we haven't received a response for oldreq,
 508            remove it from the list. */
 509         spin_lock(&c->lock);
 510         if (oldreq->status == REQ_STATUS_FLSH)
 511                 list_del(&oldreq->req_list);
 512         spin_unlock(&c->lock);
 513
 514         p9_free_req(c, req);
 515         return 0;
 516 }
 517
 518 /**
 519  * p9_client_rpc - issue a request and wait for a response
 520  * @c: client session
 521  * @type: type of request
 522  * @fmt: protocol format string (see protocol.c)
 523  *
 524  * Returns request structure (which client must free using p9_free_req)
 525  */
 526
 527 static struct p9_req_t *
 528 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
 529 {
 530         va_list ap;
 531         int tag, err;
 532         struct p9_req_t *req;
 533         unsigned long flags;
 534         int sigpending;
 535
 536         P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
 537
 538         /* we allow for any status other than disconnected */
 539         if (c->status == Disconnected)
 540                 return ERR_PTR(-EIO);
 541
 542         /* if status is begin_disconnected we allow only clunk request */
 543         if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
 544                 return ERR_PTR(-EIO);
 545
 546         if (signal_pending(current)) {
 547                 sigpending = 1;
 548                 clear_thread_flag(TIF_SIGPENDING);
 549         } else
 550                 sigpending = 0;
 551
 552         tag = P9_NOTAG;
 553         if (type != P9_TVERSION) {
 554                 tag = p9_idpool_get(c->tagpool);
 555                 if (tag < 0)
 556                         return ERR_PTR(-ENOMEM);
 557         }
 558
 559         req = p9_tag_alloc(c, tag);
 560         if (IS_ERR(req))
 561                 return req;
 562
 563         /* marshall the data */
 564         p9pdu_prepare(req->tc, tag, type);
 565         va_start(ap, fmt);
 566         err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
 567         va_end(ap);
 568         p9pdu_finalize(req->tc);
 569
 570         err = c->trans_mod->request(c, req);
 571         if (err < 0) {
 572                 c->status = Disconnected;
 573                 goto reterr;
 574         }
 575
 576         P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
 577         err = wait_event_interruptible(*req->wq,
 578                                                 req->status >= REQ_STATUS_RCVD);
 579         P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
 580                                                 req->wq, tag, err);
 581
 582         if (req->status == REQ_STATUS_ERROR) {
 583                 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
 584                 err = req->t_err;
 585         }
 586
 587         if ((err == -ERESTARTSYS) && (c->status == Connected)) {
 588                 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
 589                 sigpending = 1;
 590                 clear_thread_flag(TIF_SIGPENDING);
 591
 592                 if (c->trans_mod->cancel(c, req))
 593                         p9_client_flush(c, req);
 594
 595                 /* if we received the response anyway, don't signal error */
 596                 if (req->status == REQ_STATUS_RCVD)
 597                         err = 0;
 598         }
 599
 600         if (sigpending) {
 601                 spin_lock_irqsave(&current->sighand->siglock, flags);
 602                 recalc_sigpending();
 603                 spin_unlock_irqrestore(&current->sighand->siglock, flags);
 604         }
 605
 606         if (err < 0)
 607                 goto reterr;
 608
 609         err = p9_check_errors(c, req);
 610         if (!err) {
 611                 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
 612                 return req;
 613         }
 614
 615 reterr:
 616         P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
 617                                                                         err);
 618         p9_free_req(c, req);
 619         return ERR_PTR(err);
 620 }
 621
 622 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
 623 {
 624         int ret;
 625         struct p9_fid *fid;
 626         unsigned long flags;
 627
 628         P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
 629         fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
 630         if (!fid)
 631                 return ERR_PTR(-ENOMEM);
 632
 633         ret = p9_idpool_get(clnt->fidpool);
 634         if (ret < 0) {
 635                 ret = -ENOSPC;
 636                 goto error;
 637         }
 638         fid->fid = ret;
 639
 640         memset(&fid->qid, 0, sizeof(struct p9_qid));
 641         fid->mode = -1;
 642         fid->uid = current_fsuid();
 643         fid->clnt = clnt;
 644         fid->rdir = NULL;
 645         spin_lock_irqsave(&clnt->lock, flags);
 646         list_add(&fid->flist, &clnt->fidlist);
 647         spin_unlock_irqrestore(&clnt->lock, flags);
 648
 649         return fid;
 650
 651 error:
 652         kfree(fid);
 653         return ERR_PTR(ret);
 654 }
 655
 656 static void p9_fid_destroy(struct p9_fid *fid)
 657 {
 658         struct p9_client *clnt;
 659         unsigned long flags;
 660
 661         P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
 662         clnt = fid->clnt;
 663         p9_idpool_put(fid->fid, clnt->fidpool);
 664         spin_lock_irqsave(&clnt->lock, flags);
 665         list_del(&fid->flist);
 666         spin_unlock_irqrestore(&clnt->lock, flags);
 667         kfree(fid->rdir);
 668         kfree(fid);
 669 }
 670
 671 int p9_client_version(struct p9_client *c)
 672 {
 673         int err = 0;
 674         struct p9_req_t *req;
 675         char *version;
 676         int msize;
 677
 678         P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
 679                                                 c->msize, c->proto_version);
 680
 681         switch (c->proto_version) {
 682         case p9_proto_2000L:
 683                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 684                                         c->msize, "9P2000.L");
 685                 break;
 686         case p9_proto_2000u:
 687                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 688                                         c->msize, "9P2000.u");
 689                 break;
 690         case p9_proto_legacy:
 691                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 692                                         c->msize, "9P2000");
 693                 break;
 694         default:
 695                 return -EINVAL;
 696                 break;
 697         }
 698
 699         if (IS_ERR(req))
 700                 return PTR_ERR(req);
 701
 702         err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
 703         if (err) {
 704                 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
 705                 p9pdu_dump(1, req->rc);
 706                 goto error;
 707         }
 708
 709         P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
 710         if (!strncmp(version, "9P2000.L", 8))
 711                 c->proto_version = p9_proto_2000L;
 712         else if (!strncmp(version, "9P2000.u", 8))
 713                 c->proto_version = p9_proto_2000u;
 714         else if (!strncmp(version, "9P2000", 6))
 715                 c->proto_version = p9_proto_legacy;
 716         else {
 717                 err = -EREMOTEIO;
 718                 goto error;
 719         }
 720
 721         if (msize < c->msize)
 722                 c->msize = msize;
 723
 724 error:
 725         kfree(version);
 726         p9_free_req(c, req);
 727
 728         return err;
 729 }
 730 EXPORT_SYMBOL(p9_client_version);
 731
 732 struct p9_client *p9_client_create(const char *dev_name, char *options)
 733 {
 734         int err;
 735         struct p9_client *clnt;
 736
 737         err = 0;
 738         clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
 739         if (!clnt)
 740                 return ERR_PTR(-ENOMEM);
 741
 742         clnt->trans_mod = NULL;
 743         clnt->trans = NULL;
 744         spin_lock_init(&clnt->lock);
 745         INIT_LIST_HEAD(&clnt->fidlist);
 746
 747         p9_tag_init(clnt);
 748
 749         err = parse_opts(options, clnt);
 750         if (err < 0)
 751                 goto free_client;
 752
 753         if (!clnt->trans_mod)
 754                 clnt->trans_mod = v9fs_get_default_trans();
 755
 756         if (clnt->trans_mod == NULL) {
 757                 err = -EPROTONOSUPPORT;
 758                 P9_DPRINTK(P9_DEBUG_ERROR,
 759                                 "No transport defined or default transport\n");
 760                 goto free_client;
 761         }
 762
 763         clnt->fidpool = p9_idpool_create();
 764         if (IS_ERR(clnt->fidpool)) {
 765                 err = PTR_ERR(clnt->fidpool);
 766                 clnt->fidpool = NULL;
 767                 goto put_trans;
 768         }
 769
 770         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
 771                 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
 772
 773         err = clnt->trans_mod->create(clnt, dev_name, options);
 774         if (err)
 775                 goto destroy_fidpool;
 776
 777         if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
 778                 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
 779
 780         err = p9_client_version(clnt);
 781         if (err)
 782                 goto close_trans;
 783
 784         return clnt;
 785
 786 close_trans:
 787         clnt->trans_mod->close(clnt);
 788 destroy_fidpool:
 789         p9_idpool_destroy(clnt->fidpool);
 790 put_trans:
 791         v9fs_put_trans(clnt->trans_mod);
 792 free_client:
 793         kfree(clnt);
 794         return ERR_PTR(err);
 795 }
 796 EXPORT_SYMBOL(p9_client_create);
 797
 798 void p9_client_destroy(struct p9_client *clnt)
 799 {
 800         struct p9_fid *fid, *fidptr;
 801
 802         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
 803
 804         if (clnt->trans_mod)
 805                 clnt->trans_mod->close(clnt);
 806
 807         v9fs_put_trans(clnt->trans_mod);
 808
 809         list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
 810                 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
 811                 p9_fid_destroy(fid);
 812         }
 813
 814         if (clnt->fidpool)
 815                 p9_idpool_destroy(clnt->fidpool);
 816
 817         p9_tag_cleanup(clnt);
 818
 819         kfree(clnt);
 820 }
 821 EXPORT_SYMBOL(p9_client_destroy);
 822
 823 void p9_client_disconnect(struct p9_client *clnt)
 824 {
 825         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
 826         clnt->status = Disconnected;
 827 }
 828 EXPORT_SYMBOL(p9_client_disconnect);
 829
 830 void p9_client_begin_disconnect(struct p9_client *clnt)
 831 {
 832         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
 833         clnt->status = BeginDisconnect;
 834 }
 835 EXPORT_SYMBOL(p9_client_begin_disconnect);
 836
 837 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
 838         char *uname, u32 n_uname, char *aname)
 839 {
 840         int err;
 841         struct p9_req_t *req;
 842         struct p9_fid *fid;
 843         struct p9_qid qid;
 844
 845         P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
 846                                         afid ? afid->fid : -1, uname, aname);
 847         err = 0;
 848
 849         fid = p9_fid_create(clnt);
 850         if (IS_ERR(fid)) {
 851                 err = PTR_ERR(fid);
 852                 fid = NULL;
 853                 goto error;
 854         }
 855
 856         req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
 857                         afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
 858         if (IS_ERR(req)) {
 859                 err = PTR_ERR(req);
 860                 goto error;
 861         }
 862
 863         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
 864         if (err) {
 865                 p9pdu_dump(1, req->rc);
 866                 p9_free_req(clnt, req);
 867                 goto error;
 868         }
 869
 870         P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
 871                                         qid.type,
 872                                         (unsigned long long)qid.path,
 873                                         qid.version);
 874
 875         memmove(&fid->qid, &qid, sizeof(struct p9_qid));
 876
 877         p9_free_req(clnt, req);
 878         return fid;
 879
 880 error:
 881         if (fid)
 882                 p9_fid_destroy(fid);
 883         return ERR_PTR(err);
 884 }
 885 EXPORT_SYMBOL(p9_client_attach);
 886
 887 struct p9_fid *
 888 p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
 889 {
 890         int err;
 891         struct p9_req_t *req;
 892         struct p9_qid qid;
 893         struct p9_fid *afid;
 894
 895         P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
 896         err = 0;
 897
 898         afid = p9_fid_create(clnt);
 899         if (IS_ERR(afid)) {
 900                 err = PTR_ERR(afid);
 901                 afid = NULL;
 902                 goto error;
 903         }
 904
 905         req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
 906                         afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
 907         if (IS_ERR(req)) {
 908                 err = PTR_ERR(req);
 909                 goto error;
 910         }
 911
 912         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
 913         if (err) {
 914                 p9pdu_dump(1, req->rc);
 915                 p9_free_req(clnt, req);
 916                 goto error;
 917         }
 918
 919         P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n",
 920                                         qid.type,
 921                                         (unsigned long long)qid.path,
 922                                         qid.version);
 923
 924         memmove(&afid->qid, &qid, sizeof(struct p9_qid));
 925         p9_free_req(clnt, req);
 926         return afid;
 927
 928 error:
 929         if (afid)
 930                 p9_fid_destroy(afid);
 931         return ERR_PTR(err);
 932 }
 933 EXPORT_SYMBOL(p9_client_auth);
 934
 935 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
 936         int clone)
 937 {
 938         int err;
 939         struct p9_client *clnt;
 940         struct p9_fid *fid;
 941         struct p9_qid *wqids;
 942         struct p9_req_t *req;
 943         int16_t nwqids, count;
 944
 945         err = 0;
 946         clnt = oldfid->clnt;
 947         if (clone) {
 948                 fid = p9_fid_create(clnt);
 949                 if (IS_ERR(fid)) {
 950                         err = PTR_ERR(fid);
 951                         fid = NULL;
 952                         goto error;
 953                 }
 954
 955                 fid->uid = oldfid->uid;
 956         } else
 957                 fid = oldfid;
 958
 959
 960         P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
 961                 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
 962
 963         req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
 964                                                                 nwname, wnames);
 965         if (IS_ERR(req)) {
 966                 err = PTR_ERR(req);
 967                 goto error;
 968         }
 969
 970         err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
 971         if (err) {
 972                 p9pdu_dump(1, req->rc);
 973                 p9_free_req(clnt, req);
 974                 goto clunk_fid;
 975         }
 976         p9_free_req(clnt, req);
 977
 978         P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
 979
 980         if (nwqids != nwname) {
 981                 err = -ENOENT;
 982                 goto clunk_fid;
 983         }
 984
 985         for (count = 0; count < nwqids; count++)
 986                 P9_DPRINTK(P9_DEBUG_9P, "<<<     [%d] %x.%llx.%x\n",
 987                         count, wqids[count].type,
 988                         (unsigned long long)wqids[count].path,
 989                         wqids[count].version);
 990
 991         if (nwname)
 992                 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
 993         else
 994                 fid->qid = oldfid->qid;
 995
 996         return fid;
 997
 998 clunk_fid:
 999         p9_client_clunk(fid);
1000         fid = NULL;
1001
1002 error:
1003         if (fid && (fid != oldfid))
1004                 p9_fid_destroy(fid);
1005
1006         return ERR_PTR(err);
1007 }
1008 EXPORT_SYMBOL(p9_client_walk);
1009
1010 int p9_client_open(struct p9_fid *fid, int mode)
1011 {
1012         int err;
1013         struct p9_client *clnt;
1014         struct p9_req_t *req;
1015         struct p9_qid qid;
1016         int iounit;
1017
1018         P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode);
1019         err = 0;
1020         clnt = fid->clnt;
1021
1022         if (fid->mode != -1)
1023                 return -EINVAL;
1024
1025         req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1026         if (IS_ERR(req)) {
1027                 err = PTR_ERR(req);
1028                 goto error;
1029         }
1030
1031         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1032         if (err) {
1033                 p9pdu_dump(1, req->rc);
1034                 goto free_and_error;
1035         }
1036
1037         P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n",
1038                                 qid.type,
1039                                 (unsigned long long)qid.path,
1040                                 qid.version, iounit);
1041
1042         fid->mode = mode;
1043         fid->iounit = iounit;
1044
1045 free_and_error:
1046         p9_free_req(clnt, req);
1047 error:
1048         return err;
1049 }
1050 EXPORT_SYMBOL(p9_client_open);
1051
1052 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1053                      char *extension)
1054 {
1055         int err;
1056         struct p9_client *clnt;
1057         struct p9_req_t *req;
1058         struct p9_qid qid;
1059         int iounit;
1060
1061         P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1062                                                 fid->fid, name, perm, mode);
1063         err = 0;
1064         clnt = fid->clnt;
1065
1066         if (fid->mode != -1)
1067                 return -EINVAL;
1068
1069         req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1070                                 mode, extension);
1071         if (IS_ERR(req)) {
1072                 err = PTR_ERR(req);
1073                 goto error;
1074         }
1075
1076         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1077         if (err) {
1078                 p9pdu_dump(1, req->rc);
1079                 goto free_and_error;
1080         }
1081
1082         P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1083                                 qid.type,
1084                                 (unsigned long long)qid.path,
1085                                 qid.version, iounit);
1086
1087         fid->mode = mode;
1088         fid->iounit = iounit;
1089
1090 free_and_error:
1091         p9_free_req(clnt, req);
1092 error:
1093         return err;
1094 }
1095 EXPORT_SYMBOL(p9_client_fcreate);
1096
1097 int p9_client_clunk(struct p9_fid *fid)
1098 {
1099         int err;
1100         struct p9_client *clnt;
1101         struct p9_req_t *req;
1102
1103         P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1104         err = 0;
1105         clnt = fid->clnt;
1106
1107         req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1108         if (IS_ERR(req)) {
1109                 err = PTR_ERR(req);
1110                 goto error;
1111         }
1112
1113         P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1114
1115         p9_free_req(clnt, req);
1116         p9_fid_destroy(fid);
1117
1118 error:
1119         return err;
1120 }
1121 EXPORT_SYMBOL(p9_client_clunk);
1122
1123 int p9_client_remove(struct p9_fid *fid)
1124 {
1125         int err;
1126         struct p9_client *clnt;
1127         struct p9_req_t *req;
1128
1129         P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1130         err = 0;
1131         clnt = fid->clnt;
1132
1133         req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1134         if (IS_ERR(req)) {
1135                 err = PTR_ERR(req);
1136                 goto error;
1137         }
1138
1139         P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1140
1141         p9_free_req(clnt, req);
1142         p9_fid_destroy(fid);
1143
1144 error:
1145         return err;
1146 }
1147 EXPORT_SYMBOL(p9_client_remove);
1148
1149 int
1150 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1151                                                                 u32 count)
1152 {
1153         int err, rsize, total;
1154         struct p9_client *clnt;
1155         struct p9_req_t *req;
1156         char *dataptr;
1157
1158         P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1159                                         (long long unsigned) offset, count);
1160         err = 0;
1161         clnt = fid->clnt;
1162         total = 0;
1163
1164         rsize = fid->iounit;
1165         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1166                 rsize = clnt->msize - P9_IOHDRSZ;
1167
1168         if (count < rsize)
1169                 rsize = count;
1170
1171         req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1172         if (IS_ERR(req)) {
1173                 err = PTR_ERR(req);
1174                 goto error;
1175         }
1176
1177         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1178         if (err) {
1179                 p9pdu_dump(1, req->rc);
1180                 goto free_and_error;
1181         }
1182
1183         P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1184
1185         if (data) {
1186                 memmove(data, dataptr, count);
1187         }
1188
1189         if (udata) {
1190                 err = copy_to_user(udata, dataptr, count);
1191                 if (err) {
1192                         err = -EFAULT;
1193                         goto free_and_error;
1194                 }
1195         }
1196
1197         p9_free_req(clnt, req);
1198         return count;
1199
1200 free_and_error:
1201         p9_free_req(clnt, req);
1202 error:
1203         return err;
1204 }
1205 EXPORT_SYMBOL(p9_client_read);
1206
1207 int
1208 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1209                                                         u64 offset, u32 count)
1210 {
1211         int err, rsize, total;
1212         struct p9_client *clnt;
1213         struct p9_req_t *req;
1214
1215         P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1216                                 fid->fid, (long long unsigned) offset, count);
1217         err = 0;
1218         clnt = fid->clnt;
1219         total = 0;
1220
1221         rsize = fid->iounit;
1222         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1223                 rsize = clnt->msize - P9_IOHDRSZ;
1224
1225         if (count < rsize)
1226                 rsize = count;
1227         if (data)
1228                 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1229                                                                 rsize, data);
1230         else
1231                 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1232                                                                 rsize, udata);
1233         if (IS_ERR(req)) {
1234                 err = PTR_ERR(req);
1235                 goto error;
1236         }
1237
1238         err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1239         if (err) {
1240                 p9pdu_dump(1, req->rc);
1241                 goto free_and_error;
1242         }
1243
1244         P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1245
1246         p9_free_req(clnt, req);
1247         return count;
1248
1249 free_and_error:
1250         p9_free_req(clnt, req);
1251 error:
1252         return err;
1253 }
1254 EXPORT_SYMBOL(p9_client_write);
1255
1256 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1257 {
1258         int err;
1259         struct p9_client *clnt;
1260         struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1261         struct p9_req_t *req;
1262         u16 ignored;
1263
1264         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1265
1266         if (!ret)
1267                 return ERR_PTR(-ENOMEM);
1268
1269         err = 0;
1270         clnt = fid->clnt;
1271
1272         req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1273         if (IS_ERR(req)) {
1274                 err = PTR_ERR(req);
1275                 goto error;
1276         }
1277
1278         err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1279         if (err) {
1280                 p9pdu_dump(1, req->rc);
1281                 p9_free_req(clnt, req);
1282                 goto error;
1283         }
1284
1285         P9_DPRINTK(P9_DEBUG_9P,
1286                 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1287                 "<<<    mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1288                 "<<<    name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1289                 "<<<    uid=%d gid=%d n_muid=%d\n",
1290                 ret->size, ret->type, ret->dev, ret->qid.type,
1291                 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1292                 ret->atime, ret->mtime, (unsigned long long)ret->length,
1293                 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1294                 ret->n_uid, ret->n_gid, ret->n_muid);
1295
1296         p9_free_req(clnt, req);
1297         return ret;
1298
1299 error:
1300         kfree(ret);
1301         return ERR_PTR(err);
1302 }
1303 EXPORT_SYMBOL(p9_client_stat);
1304
1305 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1306 {
1307         int ret;
1308
1309         /* NOTE: size shouldn't include its own length */
1310         /* size[2] type[2] dev[4] qid[13] */
1311         /* mode[4] atime[4] mtime[4] length[8]*/
1312         /* name[s] uid[s] gid[s] muid[s] */
1313         ret = 2+4+13+4+4+4+8+2+2+2+2;
1314
1315         if (wst->name)
1316                 ret += strlen(wst->name);
1317         if (wst->uid)
1318                 ret += strlen(wst->uid);
1319         if (wst->gid)
1320                 ret += strlen(wst->gid);
1321         if (wst->muid)
1322                 ret += strlen(wst->muid);
1323
1324         if ((proto_version == p9_proto_2000u) ||
1325                 (proto_version == p9_proto_2000L)) {
1326                 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1327                 if (wst->extension)
1328                         ret += strlen(wst->extension);
1329         }
1330
1331         return ret;
1332 }
1333
1334 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1335 {
1336         int err;
1337         struct p9_req_t *req;
1338         struct p9_client *clnt;
1339
1340         err = 0;
1341         clnt = fid->clnt;
1342         wst->size = p9_client_statsize(wst, clnt->proto_version);
1343         P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1344         P9_DPRINTK(P9_DEBUG_9P,
1345                 "     sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1346                 "     mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1347                 "     name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1348                 "     uid=%d gid=%d n_muid=%d\n",
1349                 wst->size, wst->type, wst->dev, wst->qid.type,
1350                 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1351                 wst->atime, wst->mtime, (unsigned long long)wst->length,
1352                 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1353                 wst->n_uid, wst->n_gid, wst->n_muid);
1354
1355         req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1356         if (IS_ERR(req)) {
1357                 err = PTR_ERR(req);
1358                 goto error;
1359         }
1360
1361         P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1362
1363         p9_free_req(clnt, req);
1364 error:
1365         return err;
1366 }
1367 EXPORT_SYMBOL(p9_client_wstat);
1368
1369 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1370 {
1371         int err;
1372         struct p9_req_t *req;
1373         struct p9_client *clnt;
1374
1375         err = 0;
1376         clnt = fid->clnt;
1377
1378         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1379
1380         req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1381         if (IS_ERR(req)) {
1382                 err = PTR_ERR(req);
1383                 goto error;
1384         }
1385
1386         err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1387                 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1388                 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1389         if (err) {
1390                 p9pdu_dump(1, req->rc);
1391                 p9_free_req(clnt, req);
1392                 goto error;
1393         }
1394
1395         P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1396                 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1397                 "fsid %llu namelen %ld\n",
1398                 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1399                 sb->blocks, sb->bfree, sb->bavail, sb->files,  sb->ffree,
1400                 sb->fsid, (long int)sb->namelen);
1401
1402         p9_free_req(clnt, req);
1403 error:
1404         return err;
1405 }
1406 EXPORT_SYMBOL(p9_client_statfs);
1407
1408 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name)
1409 {
1410         int err;
1411         struct p9_req_t *req;
1412         struct p9_client *clnt;
1413
1414         err = 0;
1415         clnt = fid->clnt;
1416
1417         P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1418                         fid->fid, newdirfid->fid, name);
1419
1420         req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1421                         newdirfid->fid, name);
1422         if (IS_ERR(req)) {
1423                 err = PTR_ERR(req);
1424                 goto error;
1425         }
1426
1427         P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1428
1429         p9_free_req(clnt, req);
1430 error:
1431         return err;
1432 }
1433 EXPORT_SYMBOL(p9_client_rename);
1434