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