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/sched.h> 33 #include <linux/uaccess.h> 34 #include <net/9p/9p.h> 35 #include <linux/parser.h> 36 #include <net/9p/client.h> 37 #include <net/9p/transport.h> 38 #include "protocol.h" 39 40 /* 41 * Client Option Parsing (code inspired by NFS code) 42 * - a little lazy - parse all client options 43 */ 44 45 enum { 46 Opt_msize, 47 Opt_trans, 48 Opt_legacy, 49 Opt_version, 50 Opt_err, 51 }; 52 53 static const match_table_t tokens = { 54 {Opt_msize, "msize=%u"}, 55 {Opt_legacy, "noextend"}, 56 {Opt_trans, "trans=%s"}, 57 {Opt_version, "version=%s"}, 58 {Opt_err, NULL}, 59 }; 60 61 inline int p9_is_proto_dotl(struct p9_client *clnt) 62 { 63 return (clnt->proto_version == p9_proto_2010L); 64 } 65 EXPORT_SYMBOL(p9_is_proto_dotl); 66 67 inline int p9_is_proto_dotu(struct p9_client *clnt) 68 { 69 return (clnt->proto_version == p9_proto_2000u); 70 } 71 EXPORT_SYMBOL(p9_is_proto_dotu); 72 73 /* Interpret mount option for protocol version */ 74 static unsigned char get_protocol_version(const substring_t *name) 75 { 76 unsigned char version = -EINVAL; 77 if (!strncmp("9p2000", name->from, name->to-name->from)) { 78 version = p9_proto_legacy; 79 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n"); 80 } else if (!strncmp("9p2000.u", name->from, name->to-name->from)) { 81 version = p9_proto_2000u; 82 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 83 } else if (!strncmp("9p2010.L", name->from, name->to-name->from)) { 84 version = p9_proto_2010L; 85 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2010.L\n"); 86 } else { 87 P9_DPRINTK(P9_DEBUG_ERROR, "Unknown protocol version %s. ", 88 name->from); 89 } 90 return version; 91 } 92 93 static struct p9_req_t * 94 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 95 96 /** 97 * parse_options - parse mount options into client structure 98 * @opts: options string passed from mount 99 * @clnt: existing v9fs client information 100 * 101 * Return 0 upon success, -ERRNO upon failure 102 */ 103 104 static int parse_opts(char *opts, struct p9_client *clnt) 105 { 106 char *options, *tmp_options; 107 char *p; 108 substring_t args[MAX_OPT_ARGS]; 109 int option; 110 int ret = 0; 111 112 clnt->proto_version = p9_proto_2000u; 113 clnt->msize = 8192; 114 115 if (!opts) 116 return 0; 117 118 tmp_options = kstrdup(opts, GFP_KERNEL); 119 if (!tmp_options) { 120 P9_DPRINTK(P9_DEBUG_ERROR, 121 "failed to allocate copy of option string\n"); 122 return -ENOMEM; 123 } 124 options = tmp_options; 125 126 while ((p = strsep(&options, ",")) != NULL) { 127 int token; 128 if (!*p) 129 continue; 130 token = match_token(p, tokens, args); 131 if (token < Opt_trans) { 132 int r = match_int(&args[0], &option); 133 if (r < 0) { 134 P9_DPRINTK(P9_DEBUG_ERROR, 135 "integer field, but no integer?\n"); 136 ret = r; 137 continue; 138 } 139 } 140 switch (token) { 141 case Opt_msize: 142 clnt->msize = option; 143 break; 144 case Opt_trans: 145 clnt->trans_mod = v9fs_get_trans_by_name(&args[0]); 146 if(clnt->trans_mod == NULL) { 147 P9_DPRINTK(P9_DEBUG_ERROR, 148 "Could not find request transport: %s\n", 149 (char *) &args[0]); 150 ret = -EINVAL; 151 goto free_and_return; 152 } 153 break; 154 case Opt_legacy: 155 clnt->proto_version = p9_proto_legacy; 156 break; 157 case Opt_version: 158 ret = get_protocol_version(&args[0]); 159 if (ret == -EINVAL) 160 goto free_and_return; 161 clnt->proto_version = ret; 162 break; 163 default: 164 continue; 165 } 166 } 167 168 free_and_return: 169 kfree(tmp_options); 170 return ret; 171 } 172 173 /** 174 * p9_tag_alloc - lookup/allocate a request by tag 175 * @c: client session to lookup tag within 176 * @tag: numeric id for transaction 177 * 178 * this is a simple array lookup, but will grow the 179 * request_slots as necessary to accomodate transaction 180 * ids which did not previously have a slot. 181 * 182 * this code relies on the client spinlock to manage locks, its 183 * possible we should switch to something else, but I'd rather 184 * stick with something low-overhead for the common case. 185 * 186 */ 187 188 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag) 189 { 190 unsigned long flags; 191 int row, col; 192 struct p9_req_t *req; 193 194 /* This looks up the original request by tag so we know which 195 * buffer to read the data into */ 196 tag++; 197 198 if (tag >= c->max_tag) { 199 spin_lock_irqsave(&c->lock, flags); 200 /* check again since original check was outside of lock */ 201 while (tag >= c->max_tag) { 202 row = (tag / P9_ROW_MAXTAG); 203 c->reqs[row] = kcalloc(P9_ROW_MAXTAG, 204 sizeof(struct p9_req_t), GFP_ATOMIC); 205 206 if (!c->reqs[row]) { 207 printk(KERN_ERR "Couldn't grow tag array\n"); 208 spin_unlock_irqrestore(&c->lock, flags); 209 return ERR_PTR(-ENOMEM); 210 } 211 for (col = 0; col < P9_ROW_MAXTAG; col++) { 212 c->reqs[row][col].status = REQ_STATUS_IDLE; 213 c->reqs[row][col].tc = NULL; 214 } 215 c->max_tag += P9_ROW_MAXTAG; 216 } 217 spin_unlock_irqrestore(&c->lock, flags); 218 } 219 row = tag / P9_ROW_MAXTAG; 220 col = tag % P9_ROW_MAXTAG; 221 222 req = &c->reqs[row][col]; 223 if (!req->tc) { 224 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL); 225 if (!req->wq) { 226 printk(KERN_ERR "Couldn't grow tag array\n"); 227 return ERR_PTR(-ENOMEM); 228 } 229 init_waitqueue_head(req->wq); 230 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize, 231 GFP_KERNEL); 232 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize, 233 GFP_KERNEL); 234 if ((!req->tc) || (!req->rc)) { 235 printk(KERN_ERR "Couldn't grow tag array\n"); 236 kfree(req->tc); 237 kfree(req->rc); 238 kfree(req->wq); 239 req->tc = req->rc = NULL; 240 req->wq = NULL; 241 return ERR_PTR(-ENOMEM); 242 } 243 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall); 244 req->tc->capacity = c->msize; 245 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall); 246 req->rc->capacity = c->msize; 247 } 248 249 p9pdu_reset(req->tc); 250 p9pdu_reset(req->rc); 251 252 req->tc->tag = tag-1; 253 req->status = REQ_STATUS_ALLOC; 254 255 return &c->reqs[row][col]; 256 } 257 258 /** 259 * p9_tag_lookup - lookup a request by tag 260 * @c: client session to lookup tag within 261 * @tag: numeric id for transaction 262 * 263 */ 264 265 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 266 { 267 int row, col; 268 269 /* This looks up the original request by tag so we know which 270 * buffer to read the data into */ 271 tag++; 272 273 BUG_ON(tag >= c->max_tag); 274 275 row = tag / P9_ROW_MAXTAG; 276 col = tag % P9_ROW_MAXTAG; 277 278 return &c->reqs[row][col]; 279 } 280 EXPORT_SYMBOL(p9_tag_lookup); 281 282 /** 283 * p9_tag_init - setup tags structure and contents 284 * @c: v9fs client struct 285 * 286 * This initializes the tags structure for each client instance. 287 * 288 */ 289 290 static int p9_tag_init(struct p9_client *c) 291 { 292 int err = 0; 293 294 c->tagpool = p9_idpool_create(); 295 if (IS_ERR(c->tagpool)) { 296 err = PTR_ERR(c->tagpool); 297 c->tagpool = NULL; 298 goto error; 299 } 300 301 p9_idpool_get(c->tagpool); /* reserve tag 0 */ 302 303 c->max_tag = 0; 304 error: 305 return err; 306 } 307 308 /** 309 * p9_tag_cleanup - cleans up tags structure and reclaims resources 310 * @c: v9fs client struct 311 * 312 * This frees resources associated with the tags structure 313 * 314 */ 315 static void p9_tag_cleanup(struct p9_client *c) 316 { 317 int row, col; 318 319 /* check to insure all requests are idle */ 320 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 321 for (col = 0; col < P9_ROW_MAXTAG; col++) { 322 if (c->reqs[row][col].status != REQ_STATUS_IDLE) { 323 P9_DPRINTK(P9_DEBUG_MUX, 324 "Attempting to cleanup non-free tag %d,%d\n", 325 row, col); 326 /* TODO: delay execution of cleanup */ 327 return; 328 } 329 } 330 } 331 332 if (c->tagpool) 333 p9_idpool_destroy(c->tagpool); 334 335 /* free requests associated with tags */ 336 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 337 for (col = 0; col < P9_ROW_MAXTAG; col++) { 338 kfree(c->reqs[row][col].wq); 339 kfree(c->reqs[row][col].tc); 340 kfree(c->reqs[row][col].rc); 341 } 342 kfree(c->reqs[row]); 343 } 344 c->max_tag = 0; 345 } 346 347 /** 348 * p9_free_req - free a request and clean-up as necessary 349 * c: client state 350 * r: request to release 351 * 352 */ 353 354 static void p9_free_req(struct p9_client *c, struct p9_req_t *r) 355 { 356 int tag = r->tc->tag; 357 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 358 359 r->status = REQ_STATUS_IDLE; 360 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) 361 p9_idpool_put(tag, c->tagpool); 362 } 363 364 /** 365 * p9_client_cb - call back from transport to client 366 * c: client state 367 * req: request received 368 * 369 */ 370 void p9_client_cb(struct p9_client *c, struct p9_req_t *req) 371 { 372 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); 373 wake_up(req->wq); 374 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); 375 } 376 EXPORT_SYMBOL(p9_client_cb); 377 378 /** 379 * p9_parse_header - parse header arguments out of a packet 380 * @pdu: packet to parse 381 * @size: size of packet 382 * @type: type of request 383 * @tag: tag of packet 384 * @rewind: set if we need to rewind offset afterwards 385 */ 386 387 int 388 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 389 int rewind) 390 { 391 int8_t r_type; 392 int16_t r_tag; 393 int32_t r_size; 394 int offset = pdu->offset; 395 int err; 396 397 pdu->offset = 0; 398 if (pdu->size == 0) 399 pdu->size = 7; 400 401 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 402 if (err) 403 goto rewind_and_exit; 404 405 pdu->size = r_size; 406 pdu->id = r_type; 407 pdu->tag = r_tag; 408 409 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size, 410 pdu->id, pdu->tag); 411 412 if (type) 413 *type = r_type; 414 if (tag) 415 *tag = r_tag; 416 if (size) 417 *size = r_size; 418 419 420 rewind_and_exit: 421 if (rewind) 422 pdu->offset = offset; 423 return err; 424 } 425 EXPORT_SYMBOL(p9_parse_header); 426 427 /** 428 * p9_check_errors - check 9p packet for error return and process it 429 * @c: current client instance 430 * @req: request to parse and check for error conditions 431 * 432 * returns error code if one is discovered, otherwise returns 0 433 * 434 * this will have to be more complicated if we have multiple 435 * error packet types 436 */ 437 438 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 439 { 440 int8_t type; 441 int err; 442 443 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 444 if (err) { 445 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 446 return err; 447 } 448 449 if (type == P9_RERROR) { 450 int ecode; 451 char *ename; 452 453 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 454 &ename, &ecode); 455 if (err) { 456 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", 457 err); 458 return err; 459 } 460 461 if (p9_is_proto_dotu(c)) 462 err = -ecode; 463 464 if (!err || !IS_ERR_VALUE(err)) 465 err = p9_errstr2errno(ename, strlen(ename)); 466 467 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename); 468 469 kfree(ename); 470 } else 471 err = 0; 472 473 return err; 474 } 475 476 /** 477 * p9_client_flush - flush (cancel) a request 478 * @c: client state 479 * @oldreq: request to cancel 480 * 481 * This sents a flush for a particular requests and links 482 * the flush request to the original request. The current 483 * code only supports a single flush request although the protocol 484 * allows for multiple flush requests to be sent for a single request. 485 * 486 */ 487 488 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 489 { 490 struct p9_req_t *req; 491 int16_t oldtag; 492 int err; 493 494 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 495 if (err) 496 return err; 497 498 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 499 500 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 501 if (IS_ERR(req)) 502 return PTR_ERR(req); 503 504 505 /* if we haven't received a response for oldreq, 506 remove it from the list. */ 507 spin_lock(&c->lock); 508 if (oldreq->status == REQ_STATUS_FLSH) 509 list_del(&oldreq->req_list); 510 spin_unlock(&c->lock); 511 512 p9_free_req(c, req); 513 return 0; 514 } 515 516 /** 517 * p9_client_rpc - issue a request and wait for a response 518 * @c: client session 519 * @type: type of request 520 * @fmt: protocol format string (see protocol.c) 521 * 522 * Returns request structure (which client must free using p9_free_req) 523 */ 524 525 static struct p9_req_t * 526 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 527 { 528 va_list ap; 529 int tag, err; 530 struct p9_req_t *req; 531 unsigned long flags; 532 int sigpending; 533 534 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type); 535 536 if (c->status != Connected) 537 return ERR_PTR(-EIO); 538 539 if (signal_pending(current)) { 540 sigpending = 1; 541 clear_thread_flag(TIF_SIGPENDING); 542 } else 543 sigpending = 0; 544 545 tag = P9_NOTAG; 546 if (type != P9_TVERSION) { 547 tag = p9_idpool_get(c->tagpool); 548 if (tag < 0) 549 return ERR_PTR(-ENOMEM); 550 } 551 552 req = p9_tag_alloc(c, tag); 553 if (IS_ERR(req)) 554 return req; 555 556 /* marshall the data */ 557 p9pdu_prepare(req->tc, tag, type); 558 va_start(ap, fmt); 559 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 560 va_end(ap); 561 p9pdu_finalize(req->tc); 562 563 err = c->trans_mod->request(c, req); 564 if (err < 0) { 565 c->status = Disconnected; 566 goto reterr; 567 } 568 569 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag); 570 err = wait_event_interruptible(*req->wq, 571 req->status >= REQ_STATUS_RCVD); 572 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n", 573 req->wq, tag, err); 574 575 if (req->status == REQ_STATUS_ERROR) { 576 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 577 err = req->t_err; 578 } 579 580 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 581 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n"); 582 sigpending = 1; 583 clear_thread_flag(TIF_SIGPENDING); 584 585 if (c->trans_mod->cancel(c, req)) 586 p9_client_flush(c, req); 587 588 /* if we received the response anyway, don't signal error */ 589 if (req->status == REQ_STATUS_RCVD) 590 err = 0; 591 } 592 593 if (sigpending) { 594 spin_lock_irqsave(¤t->sighand->siglock, flags); 595 recalc_sigpending(); 596 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 597 } 598 599 if (err < 0) 600 goto reterr; 601 602 err = p9_check_errors(c, req); 603 if (!err) { 604 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type); 605 return req; 606 } 607 608 reterr: 609 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type, 610 err); 611 p9_free_req(c, req); 612 return ERR_PTR(err); 613 } 614 615 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 616 { 617 int ret; 618 struct p9_fid *fid; 619 unsigned long flags; 620 621 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt); 622 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 623 if (!fid) 624 return ERR_PTR(-ENOMEM); 625 626 ret = p9_idpool_get(clnt->fidpool); 627 if (ret < 0) { 628 ret = -ENOSPC; 629 goto error; 630 } 631 fid->fid = ret; 632 633 memset(&fid->qid, 0, sizeof(struct p9_qid)); 634 fid->mode = -1; 635 fid->uid = current_fsuid(); 636 fid->clnt = clnt; 637 fid->rdir = NULL; 638 spin_lock_irqsave(&clnt->lock, flags); 639 list_add(&fid->flist, &clnt->fidlist); 640 spin_unlock_irqrestore(&clnt->lock, flags); 641 642 return fid; 643 644 error: 645 kfree(fid); 646 return ERR_PTR(ret); 647 } 648 649 static void p9_fid_destroy(struct p9_fid *fid) 650 { 651 struct p9_client *clnt; 652 unsigned long flags; 653 654 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid); 655 clnt = fid->clnt; 656 p9_idpool_put(fid->fid, clnt->fidpool); 657 spin_lock_irqsave(&clnt->lock, flags); 658 list_del(&fid->flist); 659 spin_unlock_irqrestore(&clnt->lock, flags); 660 kfree(fid->rdir); 661 kfree(fid); 662 } 663 664 int p9_client_version(struct p9_client *c) 665 { 666 int err = 0; 667 struct p9_req_t *req; 668 char *version; 669 int msize; 670 671 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 672 c->msize, c->proto_version); 673 674 switch (c->proto_version) { 675 case p9_proto_2010L: 676 req = p9_client_rpc(c, P9_TVERSION, "ds", 677 c->msize, "9P2010.L"); 678 break; 679 case p9_proto_2000u: 680 req = p9_client_rpc(c, P9_TVERSION, "ds", 681 c->msize, "9P2000.u"); 682 break; 683 case p9_proto_legacy: 684 req = p9_client_rpc(c, P9_TVERSION, "ds", 685 c->msize, "9P2000"); 686 break; 687 default: 688 return -EINVAL; 689 break; 690 } 691 692 if (IS_ERR(req)) 693 return PTR_ERR(req); 694 695 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 696 if (err) { 697 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err); 698 p9pdu_dump(1, req->rc); 699 goto error; 700 } 701 702 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 703 if (!strncmp(version, "9P2010.L", 8)) 704 c->proto_version = p9_proto_2010L; 705 else if (!strncmp(version, "9P2000.u", 8)) 706 c->proto_version = p9_proto_2000u; 707 else if (!strncmp(version, "9P2000", 6)) 708 c->proto_version = p9_proto_legacy; 709 else { 710 err = -EREMOTEIO; 711 goto error; 712 } 713 714 if (msize < c->msize) 715 c->msize = msize; 716 717 error: 718 kfree(version); 719 p9_free_req(c, req); 720 721 return err; 722 } 723 EXPORT_SYMBOL(p9_client_version); 724 725 struct p9_client *p9_client_create(const char *dev_name, char *options) 726 { 727 int err; 728 struct p9_client *clnt; 729 730 err = 0; 731 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 732 if (!clnt) 733 return ERR_PTR(-ENOMEM); 734 735 clnt->trans_mod = NULL; 736 clnt->trans = NULL; 737 spin_lock_init(&clnt->lock); 738 INIT_LIST_HEAD(&clnt->fidlist); 739 740 p9_tag_init(clnt); 741 742 err = parse_opts(options, clnt); 743 if (err < 0) 744 goto free_client; 745 746 if (!clnt->trans_mod) 747 clnt->trans_mod = v9fs_get_default_trans(); 748 749 if (clnt->trans_mod == NULL) { 750 err = -EPROTONOSUPPORT; 751 P9_DPRINTK(P9_DEBUG_ERROR, 752 "No transport defined or default transport\n"); 753 goto free_client; 754 } 755 756 clnt->fidpool = p9_idpool_create(); 757 if (IS_ERR(clnt->fidpool)) { 758 err = PTR_ERR(clnt->fidpool); 759 clnt->fidpool = NULL; 760 goto put_trans; 761 } 762 763 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 764 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 765 766 err = clnt->trans_mod->create(clnt, dev_name, options); 767 if (err) 768 goto destroy_fidpool; 769 770 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) 771 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; 772 773 err = p9_client_version(clnt); 774 if (err) 775 goto close_trans; 776 777 return clnt; 778 779 close_trans: 780 clnt->trans_mod->close(clnt); 781 destroy_fidpool: 782 p9_idpool_destroy(clnt->fidpool); 783 put_trans: 784 v9fs_put_trans(clnt->trans_mod); 785 free_client: 786 kfree(clnt); 787 return ERR_PTR(err); 788 } 789 EXPORT_SYMBOL(p9_client_create); 790 791 void p9_client_destroy(struct p9_client *clnt) 792 { 793 struct p9_fid *fid, *fidptr; 794 795 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt); 796 797 if (clnt->trans_mod) 798 clnt->trans_mod->close(clnt); 799 800 v9fs_put_trans(clnt->trans_mod); 801 802 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) 803 p9_fid_destroy(fid); 804 805 if (clnt->fidpool) 806 p9_idpool_destroy(clnt->fidpool); 807 808 p9_tag_cleanup(clnt); 809 810 kfree(clnt); 811 } 812 EXPORT_SYMBOL(p9_client_destroy); 813 814 void p9_client_disconnect(struct p9_client *clnt) 815 { 816 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); 817 clnt->status = Disconnected; 818 } 819 EXPORT_SYMBOL(p9_client_disconnect); 820 821 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 822 char *uname, u32 n_uname, char *aname) 823 { 824 int err; 825 struct p9_req_t *req; 826 struct p9_fid *fid; 827 struct p9_qid qid; 828 829 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 830 afid ? afid->fid : -1, uname, aname); 831 err = 0; 832 833 fid = p9_fid_create(clnt); 834 if (IS_ERR(fid)) { 835 err = PTR_ERR(fid); 836 fid = NULL; 837 goto error; 838 } 839 840 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, 841 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 842 if (IS_ERR(req)) { 843 err = PTR_ERR(req); 844 goto error; 845 } 846 847 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 848 if (err) { 849 p9pdu_dump(1, req->rc); 850 p9_free_req(clnt, req); 851 goto error; 852 } 853 854 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 855 qid.type, 856 (unsigned long long)qid.path, 857 qid.version); 858 859 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 860 861 p9_free_req(clnt, req); 862 return fid; 863 864 error: 865 if (fid) 866 p9_fid_destroy(fid); 867 return ERR_PTR(err); 868 } 869 EXPORT_SYMBOL(p9_client_attach); 870 871 struct p9_fid * 872 p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname) 873 { 874 int err; 875 struct p9_req_t *req; 876 struct p9_qid qid; 877 struct p9_fid *afid; 878 879 P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname); 880 err = 0; 881 882 afid = p9_fid_create(clnt); 883 if (IS_ERR(afid)) { 884 err = PTR_ERR(afid); 885 afid = NULL; 886 goto error; 887 } 888 889 req = p9_client_rpc(clnt, P9_TAUTH, "dss?d", 890 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 891 if (IS_ERR(req)) { 892 err = PTR_ERR(req); 893 goto error; 894 } 895 896 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 897 if (err) { 898 p9pdu_dump(1, req->rc); 899 p9_free_req(clnt, req); 900 goto error; 901 } 902 903 P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n", 904 qid.type, 905 (unsigned long long)qid.path, 906 qid.version); 907 908 memmove(&afid->qid, &qid, sizeof(struct p9_qid)); 909 p9_free_req(clnt, req); 910 return afid; 911 912 error: 913 if (afid) 914 p9_fid_destroy(afid); 915 return ERR_PTR(err); 916 } 917 EXPORT_SYMBOL(p9_client_auth); 918 919 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, 920 int clone) 921 { 922 int err; 923 struct p9_client *clnt; 924 struct p9_fid *fid; 925 struct p9_qid *wqids; 926 struct p9_req_t *req; 927 int16_t nwqids, count; 928 929 err = 0; 930 clnt = oldfid->clnt; 931 if (clone) { 932 fid = p9_fid_create(clnt); 933 if (IS_ERR(fid)) { 934 err = PTR_ERR(fid); 935 fid = NULL; 936 goto error; 937 } 938 939 fid->uid = oldfid->uid; 940 } else 941 fid = oldfid; 942 943 944 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n", 945 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 946 947 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 948 nwname, wnames); 949 if (IS_ERR(req)) { 950 err = PTR_ERR(req); 951 goto error; 952 } 953 954 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 955 if (err) { 956 p9pdu_dump(1, req->rc); 957 p9_free_req(clnt, req); 958 goto clunk_fid; 959 } 960 p9_free_req(clnt, req); 961 962 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 963 964 if (nwqids != nwname) { 965 err = -ENOENT; 966 goto clunk_fid; 967 } 968 969 for (count = 0; count < nwqids; count++) 970 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 971 count, wqids[count].type, 972 (unsigned long long)wqids[count].path, 973 wqids[count].version); 974 975 if (nwname) 976 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 977 else 978 fid->qid = oldfid->qid; 979 980 return fid; 981 982 clunk_fid: 983 p9_client_clunk(fid); 984 fid = NULL; 985 986 error: 987 if (fid && (fid != oldfid)) 988 p9_fid_destroy(fid); 989 990 return ERR_PTR(err); 991 } 992 EXPORT_SYMBOL(p9_client_walk); 993 994 int p9_client_open(struct p9_fid *fid, int mode) 995 { 996 int err; 997 struct p9_client *clnt; 998 struct p9_req_t *req; 999 struct p9_qid qid; 1000 int iounit; 1001 1002 P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode); 1003 err = 0; 1004 clnt = fid->clnt; 1005 1006 if (fid->mode != -1) 1007 return -EINVAL; 1008 1009 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1010 if (IS_ERR(req)) { 1011 err = PTR_ERR(req); 1012 goto error; 1013 } 1014 1015 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1016 if (err) { 1017 p9pdu_dump(1, req->rc); 1018 goto free_and_error; 1019 } 1020 1021 P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n", 1022 qid.type, 1023 (unsigned long long)qid.path, 1024 qid.version, iounit); 1025 1026 fid->mode = mode; 1027 fid->iounit = iounit; 1028 1029 free_and_error: 1030 p9_free_req(clnt, req); 1031 error: 1032 return err; 1033 } 1034 EXPORT_SYMBOL(p9_client_open); 1035 1036 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, 1037 char *extension) 1038 { 1039 int err; 1040 struct p9_client *clnt; 1041 struct p9_req_t *req; 1042 struct p9_qid qid; 1043 int iounit; 1044 1045 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1046 fid->fid, name, perm, mode); 1047 err = 0; 1048 clnt = fid->clnt; 1049 1050 if (fid->mode != -1) 1051 return -EINVAL; 1052 1053 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1054 mode, extension); 1055 if (IS_ERR(req)) { 1056 err = PTR_ERR(req); 1057 goto error; 1058 } 1059 1060 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1061 if (err) { 1062 p9pdu_dump(1, req->rc); 1063 goto free_and_error; 1064 } 1065 1066 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1067 qid.type, 1068 (unsigned long long)qid.path, 1069 qid.version, iounit); 1070 1071 fid->mode = mode; 1072 fid->iounit = iounit; 1073 1074 free_and_error: 1075 p9_free_req(clnt, req); 1076 error: 1077 return err; 1078 } 1079 EXPORT_SYMBOL(p9_client_fcreate); 1080 1081 int p9_client_clunk(struct p9_fid *fid) 1082 { 1083 int err; 1084 struct p9_client *clnt; 1085 struct p9_req_t *req; 1086 1087 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid); 1088 err = 0; 1089 clnt = fid->clnt; 1090 1091 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1092 if (IS_ERR(req)) { 1093 err = PTR_ERR(req); 1094 goto error; 1095 } 1096 1097 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1098 1099 p9_free_req(clnt, req); 1100 p9_fid_destroy(fid); 1101 1102 error: 1103 return err; 1104 } 1105 EXPORT_SYMBOL(p9_client_clunk); 1106 1107 int p9_client_remove(struct p9_fid *fid) 1108 { 1109 int err; 1110 struct p9_client *clnt; 1111 struct p9_req_t *req; 1112 1113 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1114 err = 0; 1115 clnt = fid->clnt; 1116 1117 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1118 if (IS_ERR(req)) { 1119 err = PTR_ERR(req); 1120 goto error; 1121 } 1122 1123 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1124 1125 p9_free_req(clnt, req); 1126 p9_fid_destroy(fid); 1127 1128 error: 1129 return err; 1130 } 1131 EXPORT_SYMBOL(p9_client_remove); 1132 1133 int 1134 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, 1135 u32 count) 1136 { 1137 int err, rsize, total; 1138 struct p9_client *clnt; 1139 struct p9_req_t *req; 1140 char *dataptr; 1141 1142 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid, 1143 (long long unsigned) offset, count); 1144 err = 0; 1145 clnt = fid->clnt; 1146 total = 0; 1147 1148 rsize = fid->iounit; 1149 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1150 rsize = clnt->msize - P9_IOHDRSZ; 1151 1152 if (count < rsize) 1153 rsize = count; 1154 1155 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize); 1156 if (IS_ERR(req)) { 1157 err = PTR_ERR(req); 1158 goto error; 1159 } 1160 1161 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1162 if (err) { 1163 p9pdu_dump(1, req->rc); 1164 goto free_and_error; 1165 } 1166 1167 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1168 1169 if (data) { 1170 memmove(data, dataptr, count); 1171 } 1172 1173 if (udata) { 1174 err = copy_to_user(udata, dataptr, count); 1175 if (err) { 1176 err = -EFAULT; 1177 goto free_and_error; 1178 } 1179 } 1180 1181 p9_free_req(clnt, req); 1182 return count; 1183 1184 free_and_error: 1185 p9_free_req(clnt, req); 1186 error: 1187 return err; 1188 } 1189 EXPORT_SYMBOL(p9_client_read); 1190 1191 int 1192 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, 1193 u64 offset, u32 count) 1194 { 1195 int err, rsize, total; 1196 struct p9_client *clnt; 1197 struct p9_req_t *req; 1198 1199 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", 1200 fid->fid, (long long unsigned) offset, count); 1201 err = 0; 1202 clnt = fid->clnt; 1203 total = 0; 1204 1205 rsize = fid->iounit; 1206 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1207 rsize = clnt->msize - P9_IOHDRSZ; 1208 1209 if (count < rsize) 1210 rsize = count; 1211 if (data) 1212 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset, 1213 rsize, data); 1214 else 1215 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset, 1216 rsize, udata); 1217 if (IS_ERR(req)) { 1218 err = PTR_ERR(req); 1219 goto error; 1220 } 1221 1222 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1223 if (err) { 1224 p9pdu_dump(1, req->rc); 1225 goto free_and_error; 1226 } 1227 1228 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1229 1230 p9_free_req(clnt, req); 1231 return count; 1232 1233 free_and_error: 1234 p9_free_req(clnt, req); 1235 error: 1236 return err; 1237 } 1238 EXPORT_SYMBOL(p9_client_write); 1239 1240 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1241 { 1242 int err; 1243 struct p9_client *clnt; 1244 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1245 struct p9_req_t *req; 1246 u16 ignored; 1247 1248 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1249 1250 if (!ret) 1251 return ERR_PTR(-ENOMEM); 1252 1253 err = 0; 1254 clnt = fid->clnt; 1255 1256 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1257 if (IS_ERR(req)) { 1258 err = PTR_ERR(req); 1259 goto error; 1260 } 1261 1262 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1263 if (err) { 1264 p9pdu_dump(1, req->rc); 1265 p9_free_req(clnt, req); 1266 goto error; 1267 } 1268 1269 P9_DPRINTK(P9_DEBUG_9P, 1270 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1271 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1272 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1273 "<<< uid=%d gid=%d n_muid=%d\n", 1274 ret->size, ret->type, ret->dev, ret->qid.type, 1275 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1276 ret->atime, ret->mtime, (unsigned long long)ret->length, 1277 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1278 ret->n_uid, ret->n_gid, ret->n_muid); 1279 1280 p9_free_req(clnt, req); 1281 return ret; 1282 1283 error: 1284 kfree(ret); 1285 return ERR_PTR(err); 1286 } 1287 EXPORT_SYMBOL(p9_client_stat); 1288 1289 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1290 { 1291 int ret; 1292 1293 /* NOTE: size shouldn't include its own length */ 1294 /* size[2] type[2] dev[4] qid[13] */ 1295 /* mode[4] atime[4] mtime[4] length[8]*/ 1296 /* name[s] uid[s] gid[s] muid[s] */ 1297 ret = 2+4+13+4+4+4+8+2+2+2+2; 1298 1299 if (wst->name) 1300 ret += strlen(wst->name); 1301 if (wst->uid) 1302 ret += strlen(wst->uid); 1303 if (wst->gid) 1304 ret += strlen(wst->gid); 1305 if (wst->muid) 1306 ret += strlen(wst->muid); 1307 1308 if (proto_version == p9_proto_2000u) { 1309 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1310 if (wst->extension) 1311 ret += strlen(wst->extension); 1312 } 1313 1314 return ret; 1315 } 1316 1317 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1318 { 1319 int err; 1320 struct p9_req_t *req; 1321 struct p9_client *clnt; 1322 1323 err = 0; 1324 clnt = fid->clnt; 1325 wst->size = p9_client_statsize(wst, clnt->proto_version); 1326 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1327 P9_DPRINTK(P9_DEBUG_9P, 1328 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1329 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1330 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1331 " uid=%d gid=%d n_muid=%d\n", 1332 wst->size, wst->type, wst->dev, wst->qid.type, 1333 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1334 wst->atime, wst->mtime, (unsigned long long)wst->length, 1335 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1336 wst->n_uid, wst->n_gid, wst->n_muid); 1337 1338 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1339 if (IS_ERR(req)) { 1340 err = PTR_ERR(req); 1341 goto error; 1342 } 1343 1344 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1345 1346 p9_free_req(clnt, req); 1347 error: 1348 return err; 1349 } 1350 EXPORT_SYMBOL(p9_client_wstat); 1351