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