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         if (err)
 583                 goto reterr;
 584         p9pdu_finalize(req->tc);
 585
 586         err = c->trans_mod->request(c, req);
 587         if (err < 0) {
 588                 if (err != -ERESTARTSYS)
 589                         c->status = Disconnected;
 590                 goto reterr;
 591         }
 592
 593         P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
 594         err = wait_event_interruptible(*req->wq,
 595                                                 req->status >= REQ_STATUS_RCVD);
 596         P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
 597                                                 req->wq, tag, err);
 598
 599         if (req->status == REQ_STATUS_ERROR) {
 600                 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
 601                 err = req->t_err;
 602         }
 603
 604         if ((err == -ERESTARTSYS) && (c->status == Connected)) {
 605                 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
 606                 sigpending = 1;
 607                 clear_thread_flag(TIF_SIGPENDING);
 608
 609                 if (c->trans_mod->cancel(c, req))
 610                         p9_client_flush(c, req);
 611
 612                 /* if we received the response anyway, don't signal error */
 613                 if (req->status == REQ_STATUS_RCVD)
 614                         err = 0;
 615         }
 616
 617         if (sigpending) {
 618                 spin_lock_irqsave(&current->sighand->siglock, flags);
 619                 recalc_sigpending();
 620                 spin_unlock_irqrestore(&current->sighand->siglock, flags);
 621         }
 622
 623         if (err < 0)
 624                 goto reterr;
 625
 626         err = p9_check_errors(c, req);
 627         if (!err) {
 628                 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
 629                 return req;
 630         }
 631
 632 reterr:
 633         P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
 634                                                                         err);
 635         p9_free_req(c, req);
 636         return ERR_PTR(err);
 637 }
 638
 639 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
 640 {
 641         int ret;
 642         struct p9_fid *fid;
 643         unsigned long flags;
 644
 645         P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
 646         fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
 647         if (!fid)
 648                 return ERR_PTR(-ENOMEM);
 649
 650         ret = p9_idpool_get(clnt->fidpool);
 651         if (ret < 0) {
 652                 ret = -ENOSPC;
 653                 goto error;
 654         }
 655         fid->fid = ret;
 656
 657         memset(&fid->qid, 0, sizeof(struct p9_qid));
 658         fid->mode = -1;
 659         fid->uid = current_fsuid();
 660         fid->clnt = clnt;
 661         fid->rdir = NULL;
 662         spin_lock_irqsave(&clnt->lock, flags);
 663         list_add(&fid->flist, &clnt->fidlist);
 664         spin_unlock_irqrestore(&clnt->lock, flags);
 665
 666         return fid;
 667
 668 error:
 669         kfree(fid);
 670         return ERR_PTR(ret);
 671 }
 672
 673 static void p9_fid_destroy(struct p9_fid *fid)
 674 {
 675         struct p9_client *clnt;
 676         unsigned long flags;
 677
 678         P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
 679         clnt = fid->clnt;
 680         p9_idpool_put(fid->fid, clnt->fidpool);
 681         spin_lock_irqsave(&clnt->lock, flags);
 682         list_del(&fid->flist);
 683         spin_unlock_irqrestore(&clnt->lock, flags);
 684         kfree(fid->rdir);
 685         kfree(fid);
 686 }
 687
 688 static int p9_client_version(struct p9_client *c)
 689 {
 690         int err = 0;
 691         struct p9_req_t *req;
 692         char *version;
 693         int msize;
 694
 695         P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
 696                                                 c->msize, c->proto_version);
 697
 698         switch (c->proto_version) {
 699         case p9_proto_2000L:
 700                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 701                                         c->msize, "9P2000.L");
 702                 break;
 703         case p9_proto_2000u:
 704                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 705                                         c->msize, "9P2000.u");
 706                 break;
 707         case p9_proto_legacy:
 708                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 709                                         c->msize, "9P2000");
 710                 break;
 711         default:
 712                 return -EINVAL;
 713                 break;
 714         }
 715
 716         if (IS_ERR(req))
 717                 return PTR_ERR(req);
 718
 719         err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
 720         if (err) {
 721                 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
 722                 p9pdu_dump(1, req->rc);
 723                 goto error;
 724         }
 725
 726         P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
 727         if (!strncmp(version, "9P2000.L", 8))
 728                 c->proto_version = p9_proto_2000L;
 729         else if (!strncmp(version, "9P2000.u", 8))
 730                 c->proto_version = p9_proto_2000u;
 731         else if (!strncmp(version, "9P2000", 6))
 732                 c->proto_version = p9_proto_legacy;
 733         else {
 734                 err = -EREMOTEIO;
 735                 goto error;
 736         }
 737
 738         if (msize < c->msize)
 739                 c->msize = msize;
 740
 741 error:
 742         kfree(version);
 743         p9_free_req(c, req);
 744
 745         return err;
 746 }
 747
 748 struct p9_client *p9_client_create(const char *dev_name, char *options)
 749 {
 750         int err;
 751         struct p9_client *clnt;
 752
 753         err = 0;
 754         clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
 755         if (!clnt)
 756                 return ERR_PTR(-ENOMEM);
 757
 758         clnt->trans_mod = NULL;
 759         clnt->trans = NULL;
 760         spin_lock_init(&clnt->lock);
 761         INIT_LIST_HEAD(&clnt->fidlist);
 762
 763         p9_tag_init(clnt);
 764
 765         err = parse_opts(options, clnt);
 766         if (err < 0)
 767                 goto free_client;
 768
 769         if (!clnt->trans_mod)
 770                 clnt->trans_mod = v9fs_get_default_trans();
 771
 772         if (clnt->trans_mod == NULL) {
 773                 err = -EPROTONOSUPPORT;
 774                 P9_DPRINTK(P9_DEBUG_ERROR,
 775                                 "No transport defined or default transport\n");
 776                 goto free_client;
 777         }
 778
 779         clnt->fidpool = p9_idpool_create();
 780         if (IS_ERR(clnt->fidpool)) {
 781                 err = PTR_ERR(clnt->fidpool);
 782                 clnt->fidpool = NULL;
 783                 goto put_trans;
 784         }
 785
 786         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
 787                 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
 788
 789         err = clnt->trans_mod->create(clnt, dev_name, options);
 790         if (err)
 791                 goto destroy_fidpool;
 792
 793         if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
 794                 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
 795
 796         err = p9_client_version(clnt);
 797         if (err)
 798                 goto close_trans;
 799
 800         return clnt;
 801
 802 close_trans:
 803         clnt->trans_mod->close(clnt);
 804 destroy_fidpool:
 805         p9_idpool_destroy(clnt->fidpool);
 806 put_trans:
 807         v9fs_put_trans(clnt->trans_mod);
 808 free_client:
 809         kfree(clnt);
 810         return ERR_PTR(err);
 811 }
 812 EXPORT_SYMBOL(p9_client_create);
 813
 814 void p9_client_destroy(struct p9_client *clnt)
 815 {
 816         struct p9_fid *fid, *fidptr;
 817
 818         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
 819
 820         if (clnt->trans_mod)
 821                 clnt->trans_mod->close(clnt);
 822
 823         v9fs_put_trans(clnt->trans_mod);
 824
 825         list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
 826                 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
 827                 p9_fid_destroy(fid);
 828         }
 829
 830         if (clnt->fidpool)
 831                 p9_idpool_destroy(clnt->fidpool);
 832
 833         p9_tag_cleanup(clnt);
 834
 835         kfree(clnt);
 836 }
 837 EXPORT_SYMBOL(p9_client_destroy);
 838
 839 void p9_client_disconnect(struct p9_client *clnt)
 840 {
 841         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
 842         clnt->status = Disconnected;
 843 }
 844 EXPORT_SYMBOL(p9_client_disconnect);
 845
 846 void p9_client_begin_disconnect(struct p9_client *clnt)
 847 {
 848         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
 849         clnt->status = BeginDisconnect;
 850 }
 851 EXPORT_SYMBOL(p9_client_begin_disconnect);
 852
 853 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
 854         char *uname, u32 n_uname, char *aname)
 855 {
 856         int err;
 857         struct p9_req_t *req;
 858         struct p9_fid *fid;
 859         struct p9_qid qid;
 860
 861         P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
 862                                         afid ? afid->fid : -1, uname, aname);
 863         err = 0;
 864
 865         fid = p9_fid_create(clnt);
 866         if (IS_ERR(fid)) {
 867                 err = PTR_ERR(fid);
 868                 fid = NULL;
 869                 goto error;
 870         }
 871
 872         req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
 873                         afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
 874         if (IS_ERR(req)) {
 875                 err = PTR_ERR(req);
 876                 goto error;
 877         }
 878
 879         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
 880         if (err) {
 881                 p9pdu_dump(1, req->rc);
 882                 p9_free_req(clnt, req);
 883                 goto error;
 884         }
 885
 886         P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
 887                                         qid.type,
 888                                         (unsigned long long)qid.path,
 889                                         qid.version);
 890
 891         memmove(&fid->qid, &qid, sizeof(struct p9_qid));
 892
 893         p9_free_req(clnt, req);
 894         return fid;
 895
 896 error:
 897         if (fid)
 898                 p9_fid_destroy(fid);
 899         return ERR_PTR(err);
 900 }
 901 EXPORT_SYMBOL(p9_client_attach);
 902
 903 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
 904         int clone)
 905 {
 906         int err;
 907         struct p9_client *clnt;
 908         struct p9_fid *fid;
 909         struct p9_qid *wqids;
 910         struct p9_req_t *req;
 911         int16_t nwqids, count;
 912
 913         err = 0;
 914         wqids = NULL;
 915         clnt = oldfid->clnt;
 916         if (clone) {
 917                 fid = p9_fid_create(clnt);
 918                 if (IS_ERR(fid)) {
 919                         err = PTR_ERR(fid);
 920                         fid = NULL;
 921                         goto error;
 922                 }
 923
 924                 fid->uid = oldfid->uid;
 925         } else
 926                 fid = oldfid;
 927
 928
 929         P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
 930                 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
 931
 932         req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
 933                                                                 nwname, wnames);
 934         if (IS_ERR(req)) {
 935                 err = PTR_ERR(req);
 936                 goto error;
 937         }
 938
 939         err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
 940         if (err) {
 941                 p9pdu_dump(1, req->rc);
 942                 p9_free_req(clnt, req);
 943                 goto clunk_fid;
 944         }
 945         p9_free_req(clnt, req);
 946
 947         P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
 948
 949         if (nwqids != nwname) {
 950                 err = -ENOENT;
 951                 goto clunk_fid;
 952         }
 953
 954         for (count = 0; count < nwqids; count++)
 955                 P9_DPRINTK(P9_DEBUG_9P, "<<<     [%d] %x.%llx.%x\n",
 956                         count, wqids[count].type,
 957                         (unsigned long long)wqids[count].path,
 958                         wqids[count].version);
 959
 960         if (nwname)
 961                 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
 962         else
 963                 fid->qid = oldfid->qid;
 964
 965         kfree(wqids);
 966         return fid;
 967
 968 clunk_fid:
 969         kfree(wqids);
 970         p9_client_clunk(fid);
 971         fid = NULL;
 972
 973 error:
 974         if (fid && (fid != oldfid))
 975                 p9_fid_destroy(fid);
 976
 977         return ERR_PTR(err);
 978 }
 979 EXPORT_SYMBOL(p9_client_walk);
 980
 981 int p9_client_open(struct p9_fid *fid, int mode)
 982 {
 983         int err;
 984         struct p9_client *clnt;
 985         struct p9_req_t *req;
 986         struct p9_qid qid;
 987         int iounit;
 988
 989         clnt = fid->clnt;
 990         P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
 991                 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
 992         err = 0;
 993
 994         if (fid->mode != -1)
 995                 return -EINVAL;
 996
 997         if (p9_is_proto_dotl(clnt))
 998                 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
 999         else
1000                 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1001         if (IS_ERR(req)) {
1002                 err = PTR_ERR(req);
1003                 goto error;
1004         }
1005
1006         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1007         if (err) {
1008                 p9pdu_dump(1, req->rc);
1009                 goto free_and_error;
1010         }
1011
1012         P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1013                 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN",  qid.type,
1014                 (unsigned long long)qid.path, qid.version, iounit);
1015
1016         fid->mode = mode;
1017         fid->iounit = iounit;
1018
1019 free_and_error:
1020         p9_free_req(clnt, req);
1021 error:
1022         return err;
1023 }
1024 EXPORT_SYMBOL(p9_client_open);
1025
1026 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1027                 gid_t gid, struct p9_qid *qid)
1028 {
1029         int err = 0;
1030         struct p9_client *clnt;
1031         struct p9_req_t *req;
1032         int iounit;
1033
1034         P9_DPRINTK(P9_DEBUG_9P,
1035                         ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1036                         ofid->fid, name, flags, mode, gid);
1037         clnt = ofid->clnt;
1038
1039         if (ofid->mode != -1)
1040                 return -EINVAL;
1041
1042         req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1043                         mode, gid);
1044         if (IS_ERR(req)) {
1045                 err = PTR_ERR(req);
1046                 goto error;
1047         }
1048
1049         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1050         if (err) {
1051                 p9pdu_dump(1, req->rc);
1052                 goto free_and_error;
1053         }
1054
1055         P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1056                         qid->type,
1057                         (unsigned long long)qid->path,
1058                         qid->version, iounit);
1059
1060         ofid->mode = mode;
1061         ofid->iounit = iounit;
1062
1063 free_and_error:
1064         p9_free_req(clnt, req);
1065 error:
1066         return err;
1067 }
1068 EXPORT_SYMBOL(p9_client_create_dotl);
1069
1070 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1071                      char *extension)
1072 {
1073         int err;
1074         struct p9_client *clnt;
1075         struct p9_req_t *req;
1076         struct p9_qid qid;
1077         int iounit;
1078
1079         P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1080                                                 fid->fid, name, perm, mode);
1081         err = 0;
1082         clnt = fid->clnt;
1083
1084         if (fid->mode != -1)
1085                 return -EINVAL;
1086
1087         req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1088                                 mode, extension);
1089         if (IS_ERR(req)) {
1090                 err = PTR_ERR(req);
1091                 goto error;
1092         }
1093
1094         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1095         if (err) {
1096                 p9pdu_dump(1, req->rc);
1097                 goto free_and_error;
1098         }
1099
1100         P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1101                                 qid.type,
1102                                 (unsigned long long)qid.path,
1103                                 qid.version, iounit);
1104
1105         fid->mode = mode;
1106         fid->iounit = iounit;
1107
1108 free_and_error:
1109         p9_free_req(clnt, req);
1110 error:
1111         return err;
1112 }
1113 EXPORT_SYMBOL(p9_client_fcreate);
1114
1115 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1116                 struct p9_qid *qid)
1117 {
1118         int err = 0;
1119         struct p9_client *clnt;
1120         struct p9_req_t *req;
1121
1122         P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s  symtgt %s\n",
1123                         dfid->fid, name, symtgt);
1124         clnt = dfid->clnt;
1125
1126         req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1127                         gid);
1128         if (IS_ERR(req)) {
1129                 err = PTR_ERR(req);
1130                 goto error;
1131         }
1132
1133         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1134         if (err) {
1135                 p9pdu_dump(1, req->rc);
1136                 goto free_and_error;
1137         }
1138
1139         P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1140                         qid->type, (unsigned long long)qid->path, qid->version);
1141
1142 free_and_error:
1143         p9_free_req(clnt, req);
1144 error:
1145         return err;
1146 }
1147 EXPORT_SYMBOL(p9_client_symlink);
1148
1149 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1150 {
1151         struct p9_client *clnt;
1152         struct p9_req_t *req;
1153
1154         P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1155                         dfid->fid, oldfid->fid, newname);
1156         clnt = dfid->clnt;
1157         req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1158                         newname);
1159         if (IS_ERR(req))
1160                 return PTR_ERR(req);
1161
1162         P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1163         p9_free_req(clnt, req);
1164         return 0;
1165 }
1166 EXPORT_SYMBOL(p9_client_link);
1167
1168 int p9_client_fsync(struct p9_fid *fid, int datasync)
1169 {
1170         int err;
1171         struct p9_client *clnt;
1172         struct p9_req_t *req;
1173
1174         P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1175                         fid->fid, datasync);
1176         err = 0;
1177         clnt = fid->clnt;
1178
1179         req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1180         if (IS_ERR(req)) {
1181                 err = PTR_ERR(req);
1182                 goto error;
1183         }
1184
1185         P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1186
1187         p9_free_req(clnt, req);
1188
1189 error:
1190         return err;
1191 }
1192 EXPORT_SYMBOL(p9_client_fsync);
1193
1194 int p9_client_clunk(struct p9_fid *fid)
1195 {
1196         int err;
1197         struct p9_client *clnt;
1198         struct p9_req_t *req;
1199
1200         if (!fid) {
1201                 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1202                 dump_stack();
1203                 return 0;
1204         }
1205
1206         P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1207         err = 0;
1208         clnt = fid->clnt;
1209
1210         req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1211         if (IS_ERR(req)) {
1212                 err = PTR_ERR(req);
1213                 goto error;
1214         }
1215
1216         P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1217
1218         p9_free_req(clnt, req);
1219         p9_fid_destroy(fid);
1220
1221 error:
1222         return err;
1223 }
1224 EXPORT_SYMBOL(p9_client_clunk);
1225
1226 int p9_client_remove(struct p9_fid *fid)
1227 {
1228         int err;
1229         struct p9_client *clnt;
1230         struct p9_req_t *req;
1231
1232         P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1233         err = 0;
1234         clnt = fid->clnt;
1235
1236         req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1237         if (IS_ERR(req)) {
1238                 err = PTR_ERR(req);
1239                 goto error;
1240         }
1241
1242         P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1243
1244         p9_free_req(clnt, req);
1245 error:
1246         p9_fid_destroy(fid);
1247         return err;
1248 }
1249 EXPORT_SYMBOL(p9_client_remove);
1250
1251 int
1252 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1253                                                                 u32 count)
1254 {
1255         int err, rsize, total;
1256         struct p9_client *clnt;
1257         struct p9_req_t *req;
1258         char *dataptr;
1259
1260         P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1261                                         (long long unsigned) offset, count);
1262         err = 0;
1263         clnt = fid->clnt;
1264         total = 0;
1265
1266         rsize = fid->iounit;
1267         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1268                 rsize = clnt->msize - P9_IOHDRSZ;
1269
1270         if (count < rsize)
1271                 rsize = count;
1272
1273         req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1274         if (IS_ERR(req)) {
1275                 err = PTR_ERR(req);
1276                 goto error;
1277         }
1278
1279         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1280         if (err) {
1281                 p9pdu_dump(1, req->rc);
1282                 goto free_and_error;
1283         }
1284
1285         P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1286
1287         if (data) {
1288                 memmove(data, dataptr, count);
1289         } else {
1290                 err = copy_to_user(udata, dataptr, count);
1291                 if (err) {
1292                         err = -EFAULT;
1293                         goto free_and_error;
1294                 }
1295         }
1296         p9_free_req(clnt, req);
1297         return count;
1298
1299 free_and_error:
1300         p9_free_req(clnt, req);
1301 error:
1302         return err;
1303 }
1304 EXPORT_SYMBOL(p9_client_read);
1305
1306 int
1307 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1308                                                         u64 offset, u32 count)
1309 {
1310         int err, rsize, total;
1311         struct p9_client *clnt;
1312         struct p9_req_t *req;
1313
1314         P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1315                                 fid->fid, (long long unsigned) offset, count);
1316         err = 0;
1317         clnt = fid->clnt;
1318         total = 0;
1319
1320         rsize = fid->iounit;
1321         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1322                 rsize = clnt->msize - P9_IOHDRSZ;
1323
1324         if (count < rsize)
1325                 rsize = count;
1326         if (data)
1327                 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1328                                                                 rsize, data);
1329         else
1330                 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1331                                                                 rsize, udata);
1332         if (IS_ERR(req)) {
1333                 err = PTR_ERR(req);
1334                 goto error;
1335         }
1336
1337         err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1338         if (err) {
1339                 p9pdu_dump(1, req->rc);
1340                 goto free_and_error;
1341         }
1342
1343         P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1344
1345         p9_free_req(clnt, req);
1346         return count;
1347
1348 free_and_error:
1349         p9_free_req(clnt, req);
1350 error:
1351         return err;
1352 }
1353 EXPORT_SYMBOL(p9_client_write);
1354
1355 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1356 {
1357         int err;
1358         struct p9_client *clnt;
1359         struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1360         struct p9_req_t *req;
1361         u16 ignored;
1362
1363         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1364
1365         if (!ret)
1366                 return ERR_PTR(-ENOMEM);
1367
1368         err = 0;
1369         clnt = fid->clnt;
1370
1371         req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1372         if (IS_ERR(req)) {
1373                 err = PTR_ERR(req);
1374                 goto error;
1375         }
1376
1377         err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1378         if (err) {
1379                 p9pdu_dump(1, req->rc);
1380                 p9_free_req(clnt, req);
1381                 goto error;
1382         }
1383
1384         P9_DPRINTK(P9_DEBUG_9P,
1385                 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1386                 "<<<    mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1387                 "<<<    name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1388                 "<<<    uid=%d gid=%d n_muid=%d\n",
1389                 ret->size, ret->type, ret->dev, ret->qid.type,
1390                 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1391                 ret->atime, ret->mtime, (unsigned long long)ret->length,
1392                 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1393                 ret->n_uid, ret->n_gid, ret->n_muid);
1394
1395         p9_free_req(clnt, req);
1396         return ret;
1397
1398 error:
1399         kfree(ret);
1400         return ERR_PTR(err);
1401 }
1402 EXPORT_SYMBOL(p9_client_stat);
1403
1404 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1405                                                         u64 request_mask)
1406 {
1407         int err;
1408         struct p9_client *clnt;
1409         struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1410                                                                 GFP_KERNEL);
1411         struct p9_req_t *req;
1412
1413         P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1414                                                         fid->fid, request_mask);
1415
1416         if (!ret)
1417                 return ERR_PTR(-ENOMEM);
1418
1419         err = 0;
1420         clnt = fid->clnt;
1421
1422         req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1423         if (IS_ERR(req)) {
1424                 err = PTR_ERR(req);
1425                 goto error;
1426         }
1427
1428         err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1429         if (err) {
1430                 p9pdu_dump(1, req->rc);
1431                 p9_free_req(clnt, req);
1432                 goto error;
1433         }
1434
1435         P9_DPRINTK(P9_DEBUG_9P,
1436                 "<<< RGETATTR st_result_mask=%lld\n"
1437                 "<<< qid=%x.%llx.%x\n"
1438                 "<<< st_mode=%8.8x st_nlink=%llu\n"
1439                 "<<< st_uid=%d st_gid=%d\n"
1440                 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1441                 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1442                 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1443                 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1444                 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1445                 "<<< st_gen=%lld st_data_version=%lld",
1446                 ret->st_result_mask, ret->qid.type, ret->qid.path,
1447                 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1448                 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1449                 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1450                 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1451                 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1452                 ret->st_gen, ret->st_data_version);
1453
1454         p9_free_req(clnt, req);
1455         return ret;
1456
1457 error:
1458         kfree(ret);
1459         return ERR_PTR(err);
1460 }
1461 EXPORT_SYMBOL(p9_client_getattr_dotl);
1462
1463 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1464 {
1465         int ret;
1466
1467         /* NOTE: size shouldn't include its own length */
1468         /* size[2] type[2] dev[4] qid[13] */
1469         /* mode[4] atime[4] mtime[4] length[8]*/
1470         /* name[s] uid[s] gid[s] muid[s] */
1471         ret = 2+4+13+4+4+4+8+2+2+2+2;
1472
1473         if (wst->name)
1474                 ret += strlen(wst->name);
1475         if (wst->uid)
1476                 ret += strlen(wst->uid);
1477         if (wst->gid)
1478                 ret += strlen(wst->gid);
1479         if (wst->muid)
1480                 ret += strlen(wst->muid);
1481
1482         if ((proto_version == p9_proto_2000u) ||
1483                 (proto_version == p9_proto_2000L)) {
1484                 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1485                 if (wst->extension)
1486                         ret += strlen(wst->extension);
1487         }
1488
1489         return ret;
1490 }
1491
1492 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1493 {
1494         int err;
1495         struct p9_req_t *req;
1496         struct p9_client *clnt;
1497
1498         err = 0;
1499         clnt = fid->clnt;
1500         wst->size = p9_client_statsize(wst, clnt->proto_version);
1501         P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1502         P9_DPRINTK(P9_DEBUG_9P,
1503                 "     sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1504                 "     mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1505                 "     name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1506                 "     uid=%d gid=%d n_muid=%d\n",
1507                 wst->size, wst->type, wst->dev, wst->qid.type,
1508                 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1509                 wst->atime, wst->mtime, (unsigned long long)wst->length,
1510                 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1511                 wst->n_uid, wst->n_gid, wst->n_muid);
1512
1513         req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1514         if (IS_ERR(req)) {
1515                 err = PTR_ERR(req);
1516                 goto error;
1517         }
1518
1519         P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1520
1521         p9_free_req(clnt, req);
1522 error:
1523         return err;
1524 }
1525 EXPORT_SYMBOL(p9_client_wstat);
1526
1527 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1528 {
1529         int err;
1530         struct p9_req_t *req;
1531         struct p9_client *clnt;
1532
1533         err = 0;
1534         clnt = fid->clnt;
1535         P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1536         P9_DPRINTK(P9_DEBUG_9P,
1537                 "    valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1538                 "    atime_sec=%lld atime_nsec=%lld\n"
1539                 "    mtime_sec=%lld mtime_nsec=%lld\n",
1540                 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1541                 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1542                 p9attr->mtime_sec, p9attr->mtime_nsec);
1543
1544         req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1545
1546         if (IS_ERR(req)) {
1547                 err = PTR_ERR(req);
1548                 goto error;
1549         }
1550         P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1551         p9_free_req(clnt, req);
1552 error:
1553         return err;
1554 }
1555 EXPORT_SYMBOL(p9_client_setattr);
1556
1557 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1558 {
1559         int err;
1560         struct p9_req_t *req;
1561         struct p9_client *clnt;
1562
1563         err = 0;
1564         clnt = fid->clnt;
1565
1566         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1567
1568         req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1569         if (IS_ERR(req)) {
1570                 err = PTR_ERR(req);
1571                 goto error;
1572         }
1573
1574         err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1575                 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1576                 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1577         if (err) {
1578                 p9pdu_dump(1, req->rc);
1579                 p9_free_req(clnt, req);
1580                 goto error;
1581         }
1582
1583         P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1584                 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1585                 "fsid %llu namelen %ld\n",
1586                 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1587                 sb->blocks, sb->bfree, sb->bavail, sb->files,  sb->ffree,
1588                 sb->fsid, (long int)sb->namelen);
1589
1590         p9_free_req(clnt, req);
1591 error:
1592         return err;
1593 }
1594 EXPORT_SYMBOL(p9_client_statfs);
1595
1596 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name)
1597 {
1598         int err;
1599         struct p9_req_t *req;
1600         struct p9_client *clnt;
1601
1602         err = 0;
1603         clnt = fid->clnt;
1604
1605         P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1606                         fid->fid, newdirfid->fid, name);
1607
1608         req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1609                         newdirfid->fid, name);
1610         if (IS_ERR(req)) {
1611                 err = PTR_ERR(req);
1612                 goto error;
1613         }
1614
1615         P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1616
1617         p9_free_req(clnt, req);
1618 error:
1619         return err;
1620 }
1621 EXPORT_SYMBOL(p9_client_rename);
1622
1623 /*
1624  * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1625  */
1626 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1627                                 const char *attr_name, u64 *attr_size)
1628 {
1629         int err;
1630         struct p9_req_t *req;
1631         struct p9_client *clnt;
1632         struct p9_fid *attr_fid;
1633
1634         err = 0;
1635         clnt = file_fid->clnt;
1636         attr_fid = p9_fid_create(clnt);
1637         if (IS_ERR(attr_fid)) {
1638                 err = PTR_ERR(attr_fid);
1639                 attr_fid = NULL;
1640                 goto error;
1641         }
1642         P9_DPRINTK(P9_DEBUG_9P,
1643                 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1644                 file_fid->fid, attr_fid->fid, attr_name);
1645
1646         req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1647                         file_fid->fid, attr_fid->fid, attr_name);
1648         if (IS_ERR(req)) {
1649                 err = PTR_ERR(req);
1650                 goto error;
1651         }
1652         err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1653         if (err) {
1654                 p9pdu_dump(1, req->rc);
1655                 p9_free_req(clnt, req);
1656                 goto clunk_fid;
1657         }
1658         p9_free_req(clnt, req);
1659         P9_DPRINTK(P9_DEBUG_9P, "<<<  RXATTRWALK fid %d size %llu\n",
1660                 attr_fid->fid, *attr_size);
1661         return attr_fid;
1662 clunk_fid:
1663         p9_client_clunk(attr_fid);
1664         attr_fid = NULL;
1665 error:
1666         if (attr_fid && (attr_fid != file_fid))
1667                 p9_fid_destroy(attr_fid);
1668
1669         return ERR_PTR(err);
1670 }
1671 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1672
1673 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1674                         u64 attr_size, int flags)
1675 {
1676         int err;
1677         struct p9_req_t *req;
1678         struct p9_client *clnt;
1679
1680         P9_DPRINTK(P9_DEBUG_9P,
1681                 ">>> TXATTRCREATE fid %d name  %s size %lld flag %d\n",
1682                 fid->fid, name, (long long)attr_size, flags);
1683         err = 0;
1684         clnt = fid->clnt;
1685         req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1686                         fid->fid, name, attr_size, flags);
1687         if (IS_ERR(req)) {
1688                 err = PTR_ERR(req);
1689                 goto error;
1690         }
1691         P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
1692         p9_free_req(clnt, req);
1693 error:
1694         return err;
1695 }
1696 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
1697
1698 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
1699 {
1700         int err, rsize, total;
1701         struct p9_client *clnt;
1702         struct p9_req_t *req;
1703         char *dataptr;
1704
1705         P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
1706                                 fid->fid, (long long unsigned) offset, count);
1707
1708         err = 0;
1709         clnt = fid->clnt;
1710         total = 0;
1711
1712         rsize = fid->iounit;
1713         if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
1714                 rsize = clnt->msize - P9_READDIRHDRSZ;
1715
1716         if (count < rsize)
1717                 rsize = count;
1718
1719         req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, offset, rsize);
1720         if (IS_ERR(req)) {
1721                 err = PTR_ERR(req);
1722                 goto error;
1723         }
1724
1725         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1726         if (err) {
1727                 p9pdu_dump(1, req->rc);
1728                 goto free_and_error;
1729         }
1730
1731         P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
1732
1733         if (data)
1734                 memmove(data, dataptr, count);
1735
1736         p9_free_req(clnt, req);
1737         return count;
1738
1739 free_and_error:
1740         p9_free_req(clnt, req);
1741 error:
1742         return err;
1743 }
1744 EXPORT_SYMBOL(p9_client_readdir);
1745
1746 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
1747                         dev_t rdev, gid_t gid, struct p9_qid *qid)
1748 {
1749         int err;
1750         struct p9_client *clnt;
1751         struct p9_req_t *req;
1752
1753         err = 0;
1754         clnt = fid->clnt;
1755         P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
1756                 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
1757         req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
1758                 MAJOR(rdev), MINOR(rdev), gid);
1759         if (IS_ERR(req))
1760                 return PTR_ERR(req);
1761
1762         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1763         if (err) {
1764                 p9pdu_dump(1, req->rc);
1765                 goto error;
1766         }
1767         P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
1768                                 (unsigned long long)qid->path, qid->version);
1769
1770 error:
1771         p9_free_req(clnt, req);
1772         return err;
1773
1774 }
1775 EXPORT_SYMBOL(p9_client_mknod_dotl);
1776
1777 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
1778                                 gid_t gid, struct p9_qid *qid)
1779 {
1780         int err;
1781         struct p9_client *clnt;
1782         struct p9_req_t *req;
1783
1784         err = 0;
1785         clnt = fid->clnt;
1786         P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
1787                  fid->fid, name, mode, gid);
1788         req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
1789                 gid);
1790         if (IS_ERR(req))
1791                 return PTR_ERR(req);
1792
1793         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1794         if (err) {
1795                 p9pdu_dump(1, req->rc);
1796                 goto error;
1797         }
1798         P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
1799                                 (unsigned long long)qid->path, qid->version);
1800
1801 error:
1802         p9_free_req(clnt, req);
1803         return err;
1804
1805 }
1806 EXPORT_SYMBOL(p9_client_mkdir_dotl);
1807
1808 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
1809 {
1810         int err;
1811         struct p9_client *clnt;
1812         struct p9_req_t *req;
1813
1814         err = 0;
1815         clnt = fid->clnt;
1816         P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
1817                         "start %lld length %lld proc_id %d client_id %s\n",
1818                         fid->fid, flock->type, flock->flags, flock->start,
1819                         flock->length, flock->proc_id, flock->client_id);
1820
1821         req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
1822                                 flock->flags, flock->start, flock->length,
1823                                         flock->proc_id, flock->client_id);
1824
1825         if (IS_ERR(req))
1826                 return PTR_ERR(req);
1827
1828         err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
1829         if (err) {
1830                 p9pdu_dump(1, req->rc);
1831                 goto error;
1832         }
1833         P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
1834 error:
1835         p9_free_req(clnt, req);
1836         return err;
1837
1838 }
1839 EXPORT_SYMBOL(p9_client_lock_dotl);
1840
1841 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
1842 {
1843         int err;
1844         struct p9_client *clnt;
1845         struct p9_req_t *req;
1846
1847         err = 0;
1848         clnt = fid->clnt;
1849         P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
1850                 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
1851                 glock->start, glock->length, glock->proc_id, glock->client_id);
1852
1853         req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid,  glock->type,
1854                 glock->start, glock->length, glock->proc_id, glock->client_id);
1855
1856         if (IS_ERR(req))
1857                 return PTR_ERR(req);
1858
1859         err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
1860                         &glock->start, &glock->length, &glock->proc_id,
1861                         &glock->client_id);
1862         if (err) {
1863                 p9pdu_dump(1, req->rc);
1864                 goto error;
1865         }
1866         P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
1867                 "proc_id %d client_id %s\n", glock->type, glock->start,
1868                 glock->length, glock->proc_id, glock->client_id);
1869 error:
1870         p9_free_req(clnt, req);
1871         return err;
1872 }
1873 EXPORT_SYMBOL(p9_client_getlock_dotl);
1874
1875 int p9_client_readlink(struct p9_fid *fid, char **target)
1876 {
1877         int err;
1878         struct p9_client *clnt;
1879         struct p9_req_t *req;
1880
1881         err = 0;
1882         clnt = fid->clnt;
1883         P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
1884
1885         req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
1886         if (IS_ERR(req))
1887                 return PTR_ERR(req);
1888
1889         err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
1890         if (err) {
1891                 p9pdu_dump(1, req->rc);
1892                 goto error;
1893         }
1894         P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
1895 error:
1896         p9_free_req(clnt, req);
1897         return err;
1898 }
1899 EXPORT_SYMBOL(p9_client_readlink);