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) {
 454                 int ecode;
 455                 char *ename;
 456
 457                 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
 458                                                         &ename, &ecode);
 459                 if (err) {
 460                         P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
 461                                                                         err);
 462                         return err;
 463                 }
 464
 465                 if (p9_is_proto_dotu(c) ||
 466                         p9_is_proto_dotl(c))
 467                         err = -ecode;
 468
 469                 if (!err || !IS_ERR_VALUE(err))
 470                         err = p9_errstr2errno(ename, strlen(ename));
 471
 472                 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
 473
 474                 kfree(ename);
 475         } else
 476                 err = 0;
 477
 478         return err;
 479 }
 480
 481 /**
 482  * p9_client_flush - flush (cancel) a request
 483  * @c: client state
 484  * @oldreq: request to cancel
 485  *
 486  * This sents a flush for a particular requests and links
 487  * the flush request to the original request.  The current
 488  * code only supports a single flush request although the protocol
 489  * allows for multiple flush requests to be sent for a single request.
 490  *
 491  */
 492
 493 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
 494 {
 495         struct p9_req_t *req;
 496         int16_t oldtag;
 497         int err;
 498
 499         err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
 500         if (err)
 501                 return err;
 502
 503         P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
 504
 505         req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
 506         if (IS_ERR(req))
 507                 return PTR_ERR(req);
 508
 509
 510         /* if we haven't received a response for oldreq,
 511            remove it from the list. */
 512         spin_lock(&c->lock);
 513         if (oldreq->status == REQ_STATUS_FLSH)
 514                 list_del(&oldreq->req_list);
 515         spin_unlock(&c->lock);
 516
 517         p9_free_req(c, req);
 518         return 0;
 519 }
 520
 521 /**
 522  * p9_client_rpc - issue a request and wait for a response
 523  * @c: client session
 524  * @type: type of request
 525  * @fmt: protocol format string (see protocol.c)
 526  *
 527  * Returns request structure (which client must free using p9_free_req)
 528  */
 529
 530 static struct p9_req_t *
 531 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
 532 {
 533         va_list ap;
 534         int tag, err;
 535         struct p9_req_t *req;
 536         unsigned long flags;
 537         int sigpending;
 538
 539         P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
 540
 541         /* we allow for any status other than disconnected */
 542         if (c->status == Disconnected)
 543                 return ERR_PTR(-EIO);
 544
 545         /* if status is begin_disconnected we allow only clunk request */
 546         if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
 547                 return ERR_PTR(-EIO);
 548
 549         if (signal_pending(current)) {
 550                 sigpending = 1;
 551                 clear_thread_flag(TIF_SIGPENDING);
 552         } else
 553                 sigpending = 0;
 554
 555         tag = P9_NOTAG;
 556         if (type != P9_TVERSION) {
 557                 tag = p9_idpool_get(c->tagpool);
 558                 if (tag < 0)
 559                         return ERR_PTR(-ENOMEM);
 560         }
 561
 562         req = p9_tag_alloc(c, tag);
 563         if (IS_ERR(req))
 564                 return req;
 565
 566         /* marshall the data */
 567         p9pdu_prepare(req->tc, tag, type);
 568         va_start(ap, fmt);
 569         err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
 570         va_end(ap);
 571         p9pdu_finalize(req->tc);
 572
 573         err = c->trans_mod->request(c, req);
 574         if (err < 0) {
 575                 c->status = Disconnected;
 576                 goto reterr;
 577         }
 578
 579         P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
 580         err = wait_event_interruptible(*req->wq,
 581                                                 req->status >= REQ_STATUS_RCVD);
 582         P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
 583                                                 req->wq, tag, err);
 584
 585         if (req->status == REQ_STATUS_ERROR) {
 586                 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
 587                 err = req->t_err;
 588         }
 589
 590         if ((err == -ERESTARTSYS) && (c->status == Connected)) {
 591                 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
 592                 sigpending = 1;
 593                 clear_thread_flag(TIF_SIGPENDING);
 594
 595                 if (c->trans_mod->cancel(c, req))
 596                         p9_client_flush(c, req);
 597
 598                 /* if we received the response anyway, don't signal error */
 599                 if (req->status == REQ_STATUS_RCVD)
 600                         err = 0;
 601         }
 602
 603         if (sigpending) {
 604                 spin_lock_irqsave(&current->sighand->siglock, flags);
 605                 recalc_sigpending();
 606                 spin_unlock_irqrestore(&current->sighand->siglock, flags);
 607         }
 608
 609         if (err < 0)
 610                 goto reterr;
 611
 612         err = p9_check_errors(c, req);
 613         if (!err) {
 614                 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
 615                 return req;
 616         }
 617
 618 reterr:
 619         P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
 620                                                                         err);
 621         p9_free_req(c, req);
 622         return ERR_PTR(err);
 623 }
 624
 625 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
 626 {
 627         int ret;
 628         struct p9_fid *fid;
 629         unsigned long flags;
 630
 631         P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
 632         fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
 633         if (!fid)
 634                 return ERR_PTR(-ENOMEM);
 635
 636         ret = p9_idpool_get(clnt->fidpool);
 637         if (ret < 0) {
 638                 ret = -ENOSPC;
 639                 goto error;
 640         }
 641         fid->fid = ret;
 642
 643         memset(&fid->qid, 0, sizeof(struct p9_qid));
 644         fid->mode = -1;
 645         fid->uid = current_fsuid();
 646         fid->clnt = clnt;
 647         fid->rdir = NULL;
 648         spin_lock_irqsave(&clnt->lock, flags);
 649         list_add(&fid->flist, &clnt->fidlist);
 650         spin_unlock_irqrestore(&clnt->lock, flags);
 651
 652         return fid;
 653
 654 error:
 655         kfree(fid);
 656         return ERR_PTR(ret);
 657 }
 658
 659 static void p9_fid_destroy(struct p9_fid *fid)
 660 {
 661         struct p9_client *clnt;
 662         unsigned long flags;
 663
 664         P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
 665         clnt = fid->clnt;
 666         p9_idpool_put(fid->fid, clnt->fidpool);
 667         spin_lock_irqsave(&clnt->lock, flags);
 668         list_del(&fid->flist);
 669         spin_unlock_irqrestore(&clnt->lock, flags);
 670         kfree(fid->rdir);
 671         kfree(fid);
 672 }
 673
 674 static int p9_client_version(struct p9_client *c)
 675 {
 676         int err = 0;
 677         struct p9_req_t *req;
 678         char *version;
 679         int msize;
 680
 681         P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
 682                                                 c->msize, c->proto_version);
 683
 684         switch (c->proto_version) {
 685         case p9_proto_2000L:
 686                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 687                                         c->msize, "9P2000.L");
 688                 break;
 689         case p9_proto_2000u:
 690                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 691                                         c->msize, "9P2000.u");
 692                 break;
 693         case p9_proto_legacy:
 694                 req = p9_client_rpc(c, P9_TVERSION, "ds",
 695                                         c->msize, "9P2000");
 696                 break;
 697         default:
 698                 return -EINVAL;
 699                 break;
 700         }
 701
 702         if (IS_ERR(req))
 703                 return PTR_ERR(req);
 704
 705         err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
 706         if (err) {
 707                 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
 708                 p9pdu_dump(1, req->rc);
 709                 goto error;
 710         }
 711
 712         P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
 713         if (!strncmp(version, "9P2000.L", 8))
 714                 c->proto_version = p9_proto_2000L;
 715         else if (!strncmp(version, "9P2000.u", 8))
 716                 c->proto_version = p9_proto_2000u;
 717         else if (!strncmp(version, "9P2000", 6))
 718                 c->proto_version = p9_proto_legacy;
 719         else {
 720                 err = -EREMOTEIO;
 721                 goto error;
 722         }
 723
 724         if (msize < c->msize)
 725                 c->msize = msize;
 726
 727 error:
 728         kfree(version);
 729         p9_free_req(c, req);
 730
 731         return err;
 732 }
 733
 734 struct p9_client *p9_client_create(const char *dev_name, char *options)
 735 {
 736         int err;
 737         struct p9_client *clnt;
 738
 739         err = 0;
 740         clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
 741         if (!clnt)
 742                 return ERR_PTR(-ENOMEM);
 743
 744         clnt->trans_mod = NULL;
 745         clnt->trans = NULL;
 746         spin_lock_init(&clnt->lock);
 747         INIT_LIST_HEAD(&clnt->fidlist);
 748
 749         p9_tag_init(clnt);
 750
 751         err = parse_opts(options, clnt);
 752         if (err < 0)
 753                 goto free_client;
 754
 755         if (!clnt->trans_mod)
 756                 clnt->trans_mod = v9fs_get_default_trans();
 757
 758         if (clnt->trans_mod == NULL) {
 759                 err = -EPROTONOSUPPORT;
 760                 P9_DPRINTK(P9_DEBUG_ERROR,
 761                                 "No transport defined or default transport\n");
 762                 goto free_client;
 763         }
 764
 765         clnt->fidpool = p9_idpool_create();
 766         if (IS_ERR(clnt->fidpool)) {
 767                 err = PTR_ERR(clnt->fidpool);
 768                 clnt->fidpool = NULL;
 769                 goto put_trans;
 770         }
 771
 772         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
 773                 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
 774
 775         err = clnt->trans_mod->create(clnt, dev_name, options);
 776         if (err)
 777                 goto destroy_fidpool;
 778
 779         if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
 780                 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
 781
 782         err = p9_client_version(clnt);
 783         if (err)
 784                 goto close_trans;
 785
 786         return clnt;
 787
 788 close_trans:
 789         clnt->trans_mod->close(clnt);
 790 destroy_fidpool:
 791         p9_idpool_destroy(clnt->fidpool);
 792 put_trans:
 793         v9fs_put_trans(clnt->trans_mod);
 794 free_client:
 795         kfree(clnt);
 796         return ERR_PTR(err);
 797 }
 798 EXPORT_SYMBOL(p9_client_create);
 799
 800 void p9_client_destroy(struct p9_client *clnt)
 801 {
 802         struct p9_fid *fid, *fidptr;
 803
 804         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
 805
 806         if (clnt->trans_mod)
 807                 clnt->trans_mod->close(clnt);
 808
 809         v9fs_put_trans(clnt->trans_mod);
 810
 811         list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
 812                 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
 813                 p9_fid_destroy(fid);
 814         }
 815
 816         if (clnt->fidpool)
 817                 p9_idpool_destroy(clnt->fidpool);
 818
 819         p9_tag_cleanup(clnt);
 820
 821         kfree(clnt);
 822 }
 823 EXPORT_SYMBOL(p9_client_destroy);
 824
 825 void p9_client_disconnect(struct p9_client *clnt)
 826 {
 827         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
 828         clnt->status = Disconnected;
 829 }
 830 EXPORT_SYMBOL(p9_client_disconnect);
 831
 832 void p9_client_begin_disconnect(struct p9_client *clnt)
 833 {
 834         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
 835         clnt->status = BeginDisconnect;
 836 }
 837 EXPORT_SYMBOL(p9_client_begin_disconnect);
 838
 839 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
 840         char *uname, u32 n_uname, char *aname)
 841 {
 842         int err;
 843         struct p9_req_t *req;
 844         struct p9_fid *fid;
 845         struct p9_qid qid;
 846
 847         P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
 848                                         afid ? afid->fid : -1, uname, aname);
 849         err = 0;
 850
 851         fid = p9_fid_create(clnt);
 852         if (IS_ERR(fid)) {
 853                 err = PTR_ERR(fid);
 854                 fid = NULL;
 855                 goto error;
 856         }
 857
 858         req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
 859                         afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
 860         if (IS_ERR(req)) {
 861                 err = PTR_ERR(req);
 862                 goto error;
 863         }
 864
 865         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
 866         if (err) {
 867                 p9pdu_dump(1, req->rc);
 868                 p9_free_req(clnt, req);
 869                 goto error;
 870         }
 871
 872         P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
 873                                         qid.type,
 874                                         (unsigned long long)qid.path,
 875                                         qid.version);
 876
 877         memmove(&fid->qid, &qid, sizeof(struct p9_qid));
 878
 879         p9_free_req(clnt, req);
 880         return fid;
 881
 882 error:
 883         if (fid)
 884                 p9_fid_destroy(fid);
 885         return ERR_PTR(err);
 886 }
 887 EXPORT_SYMBOL(p9_client_attach);
 888
 889 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
 890         int clone)
 891 {
 892         int err;
 893         struct p9_client *clnt;
 894         struct p9_fid *fid;
 895         struct p9_qid *wqids;
 896         struct p9_req_t *req;
 897         int16_t nwqids, count;
 898
 899         err = 0;
 900         wqids = NULL;
 901         clnt = oldfid->clnt;
 902         if (clone) {
 903                 fid = p9_fid_create(clnt);
 904                 if (IS_ERR(fid)) {
 905                         err = PTR_ERR(fid);
 906                         fid = NULL;
 907                         goto error;
 908                 }
 909
 910                 fid->uid = oldfid->uid;
 911         } else
 912                 fid = oldfid;
 913
 914
 915         P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
 916                 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
 917
 918         req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
 919                                                                 nwname, wnames);
 920         if (IS_ERR(req)) {
 921                 err = PTR_ERR(req);
 922                 goto error;
 923         }
 924
 925         err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
 926         if (err) {
 927                 p9pdu_dump(1, req->rc);
 928                 p9_free_req(clnt, req);
 929                 goto clunk_fid;
 930         }
 931         p9_free_req(clnt, req);
 932
 933         P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
 934
 935         if (nwqids != nwname) {
 936                 err = -ENOENT;
 937                 goto clunk_fid;
 938         }
 939
 940         for (count = 0; count < nwqids; count++)
 941                 P9_DPRINTK(P9_DEBUG_9P, "<<<     [%d] %x.%llx.%x\n",
 942                         count, wqids[count].type,
 943                         (unsigned long long)wqids[count].path,
 944                         wqids[count].version);
 945
 946         if (nwname)
 947                 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
 948         else
 949                 fid->qid = oldfid->qid;
 950
 951         kfree(wqids);
 952         return fid;
 953
 954 clunk_fid:
 955         kfree(wqids);
 956         p9_client_clunk(fid);
 957         fid = NULL;
 958
 959 error:
 960         if (fid && (fid != oldfid))
 961                 p9_fid_destroy(fid);
 962
 963         return ERR_PTR(err);
 964 }
 965 EXPORT_SYMBOL(p9_client_walk);
 966
 967 int p9_client_open(struct p9_fid *fid, int mode)
 968 {
 969         int err;
 970         struct p9_client *clnt;
 971         struct p9_req_t *req;
 972         struct p9_qid qid;
 973         int iounit;
 974
 975         clnt = fid->clnt;
 976         P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
 977                 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
 978         err = 0;
 979
 980         if (fid->mode != -1)
 981                 return -EINVAL;
 982
 983         if (p9_is_proto_dotl(clnt))
 984                 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
 985         else
 986                 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
 987         if (IS_ERR(req)) {
 988                 err = PTR_ERR(req);
 989                 goto error;
 990         }
 991
 992         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
 993         if (err) {
 994                 p9pdu_dump(1, req->rc);
 995                 goto free_and_error;
 996         }
 997
 998         P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
 999                 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN",  qid.type,
1000                 (unsigned long long)qid.path, qid.version, iounit);
1001
1002         fid->mode = mode;
1003         fid->iounit = iounit;
1004
1005 free_and_error:
1006         p9_free_req(clnt, req);
1007 error:
1008         return err;
1009 }
1010 EXPORT_SYMBOL(p9_client_open);
1011
1012 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1013                 gid_t gid, struct p9_qid *qid)
1014 {
1015         int err = 0;
1016         struct p9_client *clnt;
1017         struct p9_req_t *req;
1018         int iounit;
1019
1020         P9_DPRINTK(P9_DEBUG_9P,
1021                         ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1022                         ofid->fid, name, flags, mode, gid);
1023         clnt = ofid->clnt;
1024
1025         if (ofid->mode != -1)
1026                 return -EINVAL;
1027
1028         req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1029                         mode, gid);
1030         if (IS_ERR(req)) {
1031                 err = PTR_ERR(req);
1032                 goto error;
1033         }
1034
1035         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1036         if (err) {
1037                 p9pdu_dump(1, req->rc);
1038                 goto free_and_error;
1039         }
1040
1041         P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1042                         qid->type,
1043                         (unsigned long long)qid->path,
1044                         qid->version, iounit);
1045
1046         ofid->mode = mode;
1047         ofid->iounit = iounit;
1048
1049 free_and_error:
1050         p9_free_req(clnt, req);
1051 error:
1052         return err;
1053 }
1054 EXPORT_SYMBOL(p9_client_create_dotl);
1055
1056 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1057                      char *extension)
1058 {
1059         int err;
1060         struct p9_client *clnt;
1061         struct p9_req_t *req;
1062         struct p9_qid qid;
1063         int iounit;
1064
1065         P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1066                                                 fid->fid, name, perm, mode);
1067         err = 0;
1068         clnt = fid->clnt;
1069
1070         if (fid->mode != -1)
1071                 return -EINVAL;
1072
1073         req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1074                                 mode, extension);
1075         if (IS_ERR(req)) {
1076                 err = PTR_ERR(req);
1077                 goto error;
1078         }
1079
1080         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1081         if (err) {
1082                 p9pdu_dump(1, req->rc);
1083                 goto free_and_error;
1084         }
1085
1086         P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1087                                 qid.type,
1088                                 (unsigned long long)qid.path,
1089                                 qid.version, iounit);
1090
1091         fid->mode = mode;
1092         fid->iounit = iounit;
1093
1094 free_and_error:
1095         p9_free_req(clnt, req);
1096 error:
1097         return err;
1098 }
1099 EXPORT_SYMBOL(p9_client_fcreate);
1100
1101 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1102                 struct p9_qid *qid)
1103 {
1104         int err = 0;
1105         struct p9_client *clnt;
1106         struct p9_req_t *req;
1107
1108         P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s  symtgt %s\n",
1109                         dfid->fid, name, symtgt);
1110         clnt = dfid->clnt;
1111
1112         req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1113                         gid);
1114         if (IS_ERR(req)) {
1115                 err = PTR_ERR(req);
1116                 goto error;
1117         }
1118
1119         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1120         if (err) {
1121                 p9pdu_dump(1, req->rc);
1122                 goto free_and_error;
1123         }
1124
1125         P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1126                         qid->type, (unsigned long long)qid->path, qid->version);
1127
1128 free_and_error:
1129         p9_free_req(clnt, req);
1130 error:
1131         return err;
1132 }
1133 EXPORT_SYMBOL(p9_client_symlink);
1134
1135 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1136 {
1137         struct p9_client *clnt;
1138         struct p9_req_t *req;
1139
1140         P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1141                         dfid->fid, oldfid->fid, newname);
1142         clnt = dfid->clnt;
1143         req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1144                         newname);
1145         if (IS_ERR(req))
1146                 return PTR_ERR(req);
1147
1148         P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1149         p9_free_req(clnt, req);
1150         return 0;
1151 }
1152 EXPORT_SYMBOL(p9_client_link);
1153
1154 int p9_client_clunk(struct p9_fid *fid)
1155 {
1156         int err;
1157         struct p9_client *clnt;
1158         struct p9_req_t *req;
1159
1160         P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1161         err = 0;
1162         clnt = fid->clnt;
1163
1164         req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1165         if (IS_ERR(req)) {
1166                 err = PTR_ERR(req);
1167                 goto error;
1168         }
1169
1170         P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1171
1172         p9_free_req(clnt, req);
1173         p9_fid_destroy(fid);
1174
1175 error:
1176         return err;
1177 }
1178 EXPORT_SYMBOL(p9_client_clunk);
1179
1180 int p9_client_remove(struct p9_fid *fid)
1181 {
1182         int err;
1183         struct p9_client *clnt;
1184         struct p9_req_t *req;
1185
1186         P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1187         err = 0;
1188         clnt = fid->clnt;
1189
1190         req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1191         if (IS_ERR(req)) {
1192                 err = PTR_ERR(req);
1193                 goto error;
1194         }
1195
1196         P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1197
1198         p9_free_req(clnt, req);
1199 error:
1200         p9_fid_destroy(fid);
1201         return err;
1202 }
1203 EXPORT_SYMBOL(p9_client_remove);
1204
1205 int
1206 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1207                                                                 u32 count)
1208 {
1209         int err, rsize, total;
1210         struct p9_client *clnt;
1211         struct p9_req_t *req;
1212         char *dataptr;
1213
1214         P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1215                                         (long long unsigned) offset, count);
1216         err = 0;
1217         clnt = fid->clnt;
1218         total = 0;
1219
1220         rsize = fid->iounit;
1221         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1222                 rsize = clnt->msize - P9_IOHDRSZ;
1223
1224         if (count < rsize)
1225                 rsize = count;
1226
1227         req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1228         if (IS_ERR(req)) {
1229                 err = PTR_ERR(req);
1230                 goto error;
1231         }
1232
1233         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1234         if (err) {
1235                 p9pdu_dump(1, req->rc);
1236                 goto free_and_error;
1237         }
1238
1239         P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1240
1241         if (data) {
1242                 memmove(data, dataptr, count);
1243         }
1244
1245         if (udata) {
1246                 err = copy_to_user(udata, dataptr, count);
1247                 if (err) {
1248                         err = -EFAULT;
1249                         goto free_and_error;
1250                 }
1251         }
1252
1253         p9_free_req(clnt, req);
1254         return count;
1255
1256 free_and_error:
1257         p9_free_req(clnt, req);
1258 error:
1259         return err;
1260 }
1261 EXPORT_SYMBOL(p9_client_read);
1262
1263 int
1264 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1265                                                         u64 offset, u32 count)
1266 {
1267         int err, rsize, total;
1268         struct p9_client *clnt;
1269         struct p9_req_t *req;
1270
1271         P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1272                                 fid->fid, (long long unsigned) offset, count);
1273         err = 0;
1274         clnt = fid->clnt;
1275         total = 0;
1276
1277         rsize = fid->iounit;
1278         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1279                 rsize = clnt->msize - P9_IOHDRSZ;
1280
1281         if (count < rsize)
1282                 rsize = count;
1283         if (data)
1284                 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1285                                                                 rsize, data);
1286         else
1287                 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1288                                                                 rsize, udata);
1289         if (IS_ERR(req)) {
1290                 err = PTR_ERR(req);
1291                 goto error;
1292         }
1293
1294         err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1295         if (err) {
1296                 p9pdu_dump(1, req->rc);
1297                 goto free_and_error;
1298         }
1299
1300         P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1301
1302         p9_free_req(clnt, req);
1303         return count;
1304
1305 free_and_error:
1306         p9_free_req(clnt, req);
1307 error:
1308         return err;
1309 }
1310 EXPORT_SYMBOL(p9_client_write);
1311
1312 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1313 {
1314         int err;
1315         struct p9_client *clnt;
1316         struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1317         struct p9_req_t *req;
1318         u16 ignored;
1319
1320         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1321
1322         if (!ret)
1323                 return ERR_PTR(-ENOMEM);
1324
1325         err = 0;
1326         clnt = fid->clnt;
1327
1328         req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1329         if (IS_ERR(req)) {
1330                 err = PTR_ERR(req);
1331                 goto error;
1332         }
1333
1334         err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1335         if (err) {
1336                 p9pdu_dump(1, req->rc);
1337                 p9_free_req(clnt, req);
1338                 goto error;
1339         }
1340
1341         P9_DPRINTK(P9_DEBUG_9P,
1342                 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1343                 "<<<    mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1344                 "<<<    name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1345                 "<<<    uid=%d gid=%d n_muid=%d\n",
1346                 ret->size, ret->type, ret->dev, ret->qid.type,
1347                 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1348                 ret->atime, ret->mtime, (unsigned long long)ret->length,
1349                 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1350                 ret->n_uid, ret->n_gid, ret->n_muid);
1351
1352         p9_free_req(clnt, req);
1353         return ret;
1354
1355 error:
1356         kfree(ret);
1357         return ERR_PTR(err);
1358 }
1359 EXPORT_SYMBOL(p9_client_stat);
1360
1361 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1362                                                         u64 request_mask)
1363 {
1364         int err;
1365         struct p9_client *clnt;
1366         struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1367                                                                 GFP_KERNEL);
1368         struct p9_req_t *req;
1369
1370         P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1371                                                         fid->fid, request_mask);
1372
1373         if (!ret)
1374                 return ERR_PTR(-ENOMEM);
1375
1376         err = 0;
1377         clnt = fid->clnt;
1378
1379         req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1380         if (IS_ERR(req)) {
1381                 err = PTR_ERR(req);
1382                 goto error;
1383         }
1384
1385         err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1386         if (err) {
1387                 p9pdu_dump(1, req->rc);
1388                 p9_free_req(clnt, req);
1389                 goto error;
1390         }
1391
1392         P9_DPRINTK(P9_DEBUG_9P,
1393                 "<<< RGETATTR st_result_mask=%lld\n"
1394                 "<<< qid=%x.%llx.%x\n"
1395                 "<<< st_mode=%8.8x st_nlink=%llu\n"
1396                 "<<< st_uid=%d st_gid=%d\n"
1397                 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1398                 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1399                 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1400                 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1401                 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1402                 "<<< st_gen=%lld st_data_version=%lld",
1403                 ret->st_result_mask, ret->qid.type, ret->qid.path,
1404                 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1405                 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1406                 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1407                 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1408                 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1409                 ret->st_gen, ret->st_data_version);
1410
1411         p9_free_req(clnt, req);
1412         return ret;
1413
1414 error:
1415         kfree(ret);
1416         return ERR_PTR(err);
1417 }
1418 EXPORT_SYMBOL(p9_client_getattr_dotl);
1419
1420 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1421 {
1422         int ret;
1423
1424         /* NOTE: size shouldn't include its own length */
1425         /* size[2] type[2] dev[4] qid[13] */
1426         /* mode[4] atime[4] mtime[4] length[8]*/
1427         /* name[s] uid[s] gid[s] muid[s] */
1428         ret = 2+4+13+4+4+4+8+2+2+2+2;
1429
1430         if (wst->name)
1431                 ret += strlen(wst->name);
1432         if (wst->uid)
1433                 ret += strlen(wst->uid);
1434         if (wst->gid)
1435                 ret += strlen(wst->gid);
1436         if (wst->muid)
1437                 ret += strlen(wst->muid);
1438
1439         if ((proto_version == p9_proto_2000u) ||
1440                 (proto_version == p9_proto_2000L)) {
1441                 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1442                 if (wst->extension)
1443                         ret += strlen(wst->extension);
1444         }
1445
1446         return ret;
1447 }
1448
1449 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1450 {
1451         int err;
1452         struct p9_req_t *req;
1453         struct p9_client *clnt;
1454
1455         err = 0;
1456         clnt = fid->clnt;
1457         wst->size = p9_client_statsize(wst, clnt->proto_version);
1458         P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1459         P9_DPRINTK(P9_DEBUG_9P,
1460                 "     sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1461                 "     mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1462                 "     name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1463                 "     uid=%d gid=%d n_muid=%d\n",
1464                 wst->size, wst->type, wst->dev, wst->qid.type,
1465                 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1466                 wst->atime, wst->mtime, (unsigned long long)wst->length,
1467                 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1468                 wst->n_uid, wst->n_gid, wst->n_muid);
1469
1470         req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1471         if (IS_ERR(req)) {
1472                 err = PTR_ERR(req);
1473                 goto error;
1474         }
1475
1476         P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1477
1478         p9_free_req(clnt, req);
1479 error:
1480         return err;
1481 }
1482 EXPORT_SYMBOL(p9_client_wstat);
1483
1484 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1485 {
1486         int err;
1487         struct p9_req_t *req;
1488         struct p9_client *clnt;
1489
1490         err = 0;
1491         clnt = fid->clnt;
1492         P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1493         P9_DPRINTK(P9_DEBUG_9P,
1494                 "    valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1495                 "    atime_sec=%lld atime_nsec=%lld\n"
1496                 "    mtime_sec=%lld mtime_nsec=%lld\n",
1497                 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1498                 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1499                 p9attr->mtime_sec, p9attr->mtime_nsec);
1500
1501         req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1502
1503         if (IS_ERR(req)) {
1504                 err = PTR_ERR(req);
1505                 goto error;
1506         }
1507         P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1508         p9_free_req(clnt, req);
1509 error:
1510         return err;
1511 }
1512 EXPORT_SYMBOL(p9_client_setattr);
1513
1514 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1515 {
1516         int err;
1517         struct p9_req_t *req;
1518         struct p9_client *clnt;
1519
1520         err = 0;
1521         clnt = fid->clnt;
1522
1523         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1524
1525         req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1526         if (IS_ERR(req)) {
1527                 err = PTR_ERR(req);
1528                 goto error;
1529         }
1530
1531         err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1532                 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1533                 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1534         if (err) {
1535                 p9pdu_dump(1, req->rc);
1536                 p9_free_req(clnt, req);
1537                 goto error;
1538         }
1539
1540         P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1541                 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1542                 "fsid %llu namelen %ld\n",
1543                 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1544                 sb->blocks, sb->bfree, sb->bavail, sb->files,  sb->ffree,
1545                 sb->fsid, (long int)sb->namelen);
1546
1547         p9_free_req(clnt, req);
1548 error:
1549         return err;
1550 }
1551 EXPORT_SYMBOL(p9_client_statfs);
1552
1553 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name)
1554 {
1555         int err;
1556         struct p9_req_t *req;
1557         struct p9_client *clnt;
1558
1559         err = 0;
1560         clnt = fid->clnt;
1561
1562         P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1563                         fid->fid, newdirfid->fid, name);
1564
1565         req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1566                         newdirfid->fid, name);
1567         if (IS_ERR(req)) {
1568                 err = PTR_ERR(req);
1569                 goto error;
1570         }
1571
1572         P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1573
1574         p9_free_req(clnt, req);
1575 error:
1576         return err;
1577 }
1578 EXPORT_SYMBOL(p9_client_rename);
1579
1580 /*
1581  * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1582  */
1583 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1584                                 const char *attr_name, u64 *attr_size)
1585 {
1586         int err;
1587         struct p9_req_t *req;
1588         struct p9_client *clnt;
1589         struct p9_fid *attr_fid;
1590
1591         err = 0;
1592         clnt = file_fid->clnt;
1593         attr_fid = p9_fid_create(clnt);
1594         if (IS_ERR(attr_fid)) {
1595                 err = PTR_ERR(attr_fid);
1596                 attr_fid = NULL;
1597                 goto error;
1598         }
1599         P9_DPRINTK(P9_DEBUG_9P,
1600                 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1601                 file_fid->fid, attr_fid->fid, attr_name);
1602
1603         req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1604                         file_fid->fid, attr_fid->fid, attr_name);
1605         if (IS_ERR(req)) {
1606                 err = PTR_ERR(req);
1607                 goto error;
1608         }
1609         err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1610         if (err) {
1611                 p9pdu_dump(1, req->rc);
1612                 p9_free_req(clnt, req);
1613                 goto clunk_fid;
1614         }
1615         p9_free_req(clnt, req);
1616         P9_DPRINTK(P9_DEBUG_9P, "<<<  RXATTRWALK fid %d size %llu\n",
1617                 attr_fid->fid, *attr_size);
1618         return attr_fid;
1619 clunk_fid:
1620         p9_client_clunk(attr_fid);
1621         attr_fid = NULL;
1622 error:
1623         if (attr_fid && (attr_fid != file_fid))
1624                 p9_fid_destroy(attr_fid);
1625
1626         return ERR_PTR(err);
1627 }
1628 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1629
1630 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1631                         u64 attr_size, int flags)
1632 {
1633         int err;
1634         struct p9_req_t *req;
1635         struct p9_client *clnt;
1636
1637         P9_DPRINTK(P9_DEBUG_9P,
1638                 ">>> TXATTRCREATE fid %d name  %s size %lld flag %d\n",
1639                 fid->fid, name, (long long)attr_size, flags);
1640         err = 0;
1641         clnt = fid->clnt;
1642         req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1643                         fid->fid, name, attr_size, flags);
1644         if (IS_ERR(req)) {
1645                 err = PTR_ERR(req);
1646                 goto error;
1647         }
1648         P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
1649         p9_free_req(clnt, req);
1650 error:
1651         return err;
1652 }
1653 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
1654
1655 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
1656 {
1657         int err, rsize, total;
1658         struct p9_client *clnt;
1659         struct p9_req_t *req;
1660         char *dataptr;
1661
1662         P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
1663                                 fid->fid, (long long unsigned) offset, count);
1664
1665         err = 0;
1666         clnt = fid->clnt;
1667         total = 0;
1668
1669         rsize = fid->iounit;
1670         if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
1671                 rsize = clnt->msize - P9_READDIRHDRSZ;
1672
1673         if (count < rsize)
1674                 rsize = count;
1675
1676         req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, offset, rsize);
1677         if (IS_ERR(req)) {
1678                 err = PTR_ERR(req);
1679                 goto error;
1680         }
1681
1682         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1683         if (err) {
1684                 p9pdu_dump(1, req->rc);
1685                 goto free_and_error;
1686         }
1687
1688         P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
1689
1690         if (data)
1691                 memmove(data, dataptr, count);
1692
1693         p9_free_req(clnt, req);
1694         return count;
1695
1696 free_and_error:
1697         p9_free_req(clnt, req);
1698 error:
1699         return err;
1700 }
1701 EXPORT_SYMBOL(p9_client_readdir);
1702
1703 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
1704                         dev_t rdev, gid_t gid, struct p9_qid *qid)
1705 {
1706         int err;
1707         struct p9_client *clnt;
1708         struct p9_req_t *req;
1709
1710         err = 0;
1711         clnt = fid->clnt;
1712         P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
1713                 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
1714         req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
1715                 MAJOR(rdev), MINOR(rdev), gid);
1716         if (IS_ERR(req))
1717                 return PTR_ERR(req);
1718
1719         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1720         if (err) {
1721                 p9pdu_dump(1, req->rc);
1722                 goto error;
1723         }
1724         P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
1725                                 (unsigned long long)qid->path, qid->version);
1726
1727 error:
1728         p9_free_req(clnt, req);
1729         return err;
1730
1731 }
1732 EXPORT_SYMBOL(p9_client_mknod_dotl);
1733
1734 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
1735                                 gid_t gid, struct p9_qid *qid)
1736 {
1737         int err;
1738         struct p9_client *clnt;
1739         struct p9_req_t *req;
1740
1741         err = 0;
1742         clnt = fid->clnt;
1743         P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
1744                  fid->fid, name, mode, gid);
1745         req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
1746                 gid);
1747         if (IS_ERR(req))
1748                 return PTR_ERR(req);
1749
1750         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1751         if (err) {
1752                 p9pdu_dump(1, req->rc);
1753                 goto error;
1754         }
1755         P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
1756                                 (unsigned long long)qid->path, qid->version);
1757
1758 error:
1759         p9_free_req(clnt, req);
1760         return err;
1761
1762 }
1763 EXPORT_SYMBOL(p9_client_mkdir_dotl);