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->uid = current_fsuid(); 586 fid->clnt = clnt; 587 fid->rdir = NULL; 588 spin_lock_irqsave(&clnt->lock, flags); 589 list_add(&fid->flist, &clnt->fidlist); 590 spin_unlock_irqrestore(&clnt->lock, flags); 591 592 return fid; 593 594 error: 595 kfree(fid); 596 return ERR_PTR(ret); 597 } 598 599 static void p9_fid_destroy(struct p9_fid *fid) 600 { 601 struct p9_client *clnt; 602 unsigned long flags; 603 604 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid); 605 clnt = fid->clnt; 606 p9_idpool_put(fid->fid, clnt->fidpool); 607 spin_lock_irqsave(&clnt->lock, flags); 608 list_del(&fid->flist); 609 spin_unlock_irqrestore(&clnt->lock, flags); 610 kfree(fid->rdir); 611 kfree(fid); 612 } 613 614 int p9_client_version(struct p9_client *c) 615 { 616 int err = 0; 617 struct p9_req_t *req; 618 char *version; 619 int msize; 620 621 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n", 622 c->msize, c->dotu); 623 req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize, 624 c->dotu ? "9P2000.u" : "9P2000"); 625 if (IS_ERR(req)) 626 return PTR_ERR(req); 627 628 err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version); 629 if (err) { 630 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err); 631 p9pdu_dump(1, req->rc); 632 goto error; 633 } 634 635 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 636 if (!memcmp(version, "9P2000.u", 8)) 637 c->dotu = 1; 638 else if (!memcmp(version, "9P2000", 6)) 639 c->dotu = 0; 640 else { 641 err = -EREMOTEIO; 642 goto error; 643 } 644 645 if (msize < c->msize) 646 c->msize = msize; 647 648 error: 649 kfree(version); 650 p9_free_req(c, req); 651 652 return err; 653 } 654 EXPORT_SYMBOL(p9_client_version); 655 656 struct p9_client *p9_client_create(const char *dev_name, char *options) 657 { 658 int err; 659 struct p9_client *clnt; 660 661 err = 0; 662 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 663 if (!clnt) 664 return ERR_PTR(-ENOMEM); 665 666 clnt->trans_mod = NULL; 667 clnt->trans = NULL; 668 spin_lock_init(&clnt->lock); 669 INIT_LIST_HEAD(&clnt->fidlist); 670 clnt->fidpool = p9_idpool_create(); 671 if (IS_ERR(clnt->fidpool)) { 672 err = PTR_ERR(clnt->fidpool); 673 clnt->fidpool = NULL; 674 goto error; 675 } 676 677 p9_tag_init(clnt); 678 679 err = parse_opts(options, clnt); 680 if (err < 0) 681 goto error; 682 683 if (!clnt->trans_mod) 684 clnt->trans_mod = v9fs_get_default_trans(); 685 686 if (clnt->trans_mod == NULL) { 687 err = -EPROTONOSUPPORT; 688 P9_DPRINTK(P9_DEBUG_ERROR, 689 "No transport defined or default transport\n"); 690 goto error; 691 } 692 693 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n", 694 clnt, clnt->trans_mod, clnt->msize, clnt->dotu); 695 696 err = clnt->trans_mod->create(clnt, dev_name, options); 697 if (err) 698 goto error; 699 700 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) 701 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; 702 703 err = p9_client_version(clnt); 704 if (err) 705 goto error; 706 707 return clnt; 708 709 error: 710 p9_client_destroy(clnt); 711 return ERR_PTR(err); 712 } 713 EXPORT_SYMBOL(p9_client_create); 714 715 void p9_client_destroy(struct p9_client *clnt) 716 { 717 struct p9_fid *fid, *fidptr; 718 719 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt); 720 721 if (clnt->trans_mod) 722 clnt->trans_mod->close(clnt); 723 724 v9fs_put_trans(clnt->trans_mod); 725 726 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) 727 p9_fid_destroy(fid); 728 729 if (clnt->fidpool) 730 p9_idpool_destroy(clnt->fidpool); 731 732 p9_tag_cleanup(clnt); 733 734 kfree(clnt); 735 } 736 EXPORT_SYMBOL(p9_client_destroy); 737 738 void p9_client_disconnect(struct p9_client *clnt) 739 { 740 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); 741 clnt->status = Disconnected; 742 } 743 EXPORT_SYMBOL(p9_client_disconnect); 744 745 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 746 char *uname, u32 n_uname, char *aname) 747 { 748 int err; 749 struct p9_req_t *req; 750 struct p9_fid *fid; 751 struct p9_qid qid; 752 753 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 754 afid ? afid->fid : -1, uname, aname); 755 err = 0; 756 757 fid = p9_fid_create(clnt); 758 if (IS_ERR(fid)) { 759 err = PTR_ERR(fid); 760 fid = NULL; 761 goto error; 762 } 763 764 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, 765 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 766 if (IS_ERR(req)) { 767 err = PTR_ERR(req); 768 goto error; 769 } 770 771 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid); 772 if (err) { 773 p9pdu_dump(1, req->rc); 774 p9_free_req(clnt, req); 775 goto error; 776 } 777 778 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 779 qid.type, 780 (unsigned long long)qid.path, 781 qid.version); 782 783 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 784 785 p9_free_req(clnt, req); 786 return fid; 787 788 error: 789 if (fid) 790 p9_fid_destroy(fid); 791 return ERR_PTR(err); 792 } 793 EXPORT_SYMBOL(p9_client_attach); 794 795 struct p9_fid * 796 p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname) 797 { 798 int err; 799 struct p9_req_t *req; 800 struct p9_qid qid; 801 struct p9_fid *afid; 802 803 P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname); 804 err = 0; 805 806 afid = p9_fid_create(clnt); 807 if (IS_ERR(afid)) { 808 err = PTR_ERR(afid); 809 afid = NULL; 810 goto error; 811 } 812 813 req = p9_client_rpc(clnt, P9_TAUTH, "dss?d", 814 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 815 if (IS_ERR(req)) { 816 err = PTR_ERR(req); 817 goto error; 818 } 819 820 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid); 821 if (err) { 822 p9pdu_dump(1, req->rc); 823 p9_free_req(clnt, req); 824 goto error; 825 } 826 827 P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n", 828 qid.type, 829 (unsigned long long)qid.path, 830 qid.version); 831 832 memmove(&afid->qid, &qid, sizeof(struct p9_qid)); 833 p9_free_req(clnt, req); 834 return afid; 835 836 error: 837 if (afid) 838 p9_fid_destroy(afid); 839 return ERR_PTR(err); 840 } 841 EXPORT_SYMBOL(p9_client_auth); 842 843 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, 844 int clone) 845 { 846 int err; 847 struct p9_client *clnt; 848 struct p9_fid *fid; 849 struct p9_qid *wqids; 850 struct p9_req_t *req; 851 int16_t nwqids, count; 852 853 err = 0; 854 clnt = oldfid->clnt; 855 if (clone) { 856 fid = p9_fid_create(clnt); 857 if (IS_ERR(fid)) { 858 err = PTR_ERR(fid); 859 fid = NULL; 860 goto error; 861 } 862 863 fid->uid = oldfid->uid; 864 } else 865 fid = oldfid; 866 867 868 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n", 869 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 870 871 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 872 nwname, wnames); 873 if (IS_ERR(req)) { 874 err = PTR_ERR(req); 875 goto error; 876 } 877 878 err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids); 879 if (err) { 880 p9pdu_dump(1, req->rc); 881 p9_free_req(clnt, req); 882 goto clunk_fid; 883 } 884 p9_free_req(clnt, req); 885 886 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 887 888 if (nwqids != nwname) { 889 err = -ENOENT; 890 goto clunk_fid; 891 } 892 893 for (count = 0; count < nwqids; count++) 894 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 895 count, wqids[count].type, 896 (unsigned long long)wqids[count].path, 897 wqids[count].version); 898 899 if (nwname) 900 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 901 else 902 fid->qid = oldfid->qid; 903 904 return fid; 905 906 clunk_fid: 907 p9_client_clunk(fid); 908 fid = NULL; 909 910 error: 911 if (fid && (fid != oldfid)) 912 p9_fid_destroy(fid); 913 914 return ERR_PTR(err); 915 } 916 EXPORT_SYMBOL(p9_client_walk); 917 918 int p9_client_open(struct p9_fid *fid, int mode) 919 { 920 int err; 921 struct p9_client *clnt; 922 struct p9_req_t *req; 923 struct p9_qid qid; 924 int iounit; 925 926 P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode); 927 err = 0; 928 clnt = fid->clnt; 929 930 if (fid->mode != -1) 931 return -EINVAL; 932 933 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 934 if (IS_ERR(req)) { 935 err = PTR_ERR(req); 936 goto error; 937 } 938 939 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit); 940 if (err) { 941 p9pdu_dump(1, req->rc); 942 goto free_and_error; 943 } 944 945 P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n", 946 qid.type, 947 (unsigned long long)qid.path, 948 qid.version, iounit); 949 950 fid->mode = mode; 951 fid->iounit = iounit; 952 953 free_and_error: 954 p9_free_req(clnt, req); 955 error: 956 return err; 957 } 958 EXPORT_SYMBOL(p9_client_open); 959 960 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, 961 char *extension) 962 { 963 int err; 964 struct p9_client *clnt; 965 struct p9_req_t *req; 966 struct p9_qid qid; 967 int iounit; 968 969 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 970 fid->fid, name, perm, mode); 971 err = 0; 972 clnt = fid->clnt; 973 974 if (fid->mode != -1) 975 return -EINVAL; 976 977 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 978 mode, extension); 979 if (IS_ERR(req)) { 980 err = PTR_ERR(req); 981 goto error; 982 } 983 984 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit); 985 if (err) { 986 p9pdu_dump(1, req->rc); 987 goto free_and_error; 988 } 989 990 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 991 qid.type, 992 (unsigned long long)qid.path, 993 qid.version, iounit); 994 995 fid->mode = mode; 996 fid->iounit = iounit; 997 998 free_and_error: 999 p9_free_req(clnt, req); 1000 error: 1001 return err; 1002 } 1003 EXPORT_SYMBOL(p9_client_fcreate); 1004 1005 int p9_client_clunk(struct p9_fid *fid) 1006 { 1007 int err; 1008 struct p9_client *clnt; 1009 struct p9_req_t *req; 1010 1011 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid); 1012 err = 0; 1013 clnt = fid->clnt; 1014 1015 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1016 if (IS_ERR(req)) { 1017 err = PTR_ERR(req); 1018 goto error; 1019 } 1020 1021 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1022 1023 p9_free_req(clnt, req); 1024 p9_fid_destroy(fid); 1025 1026 error: 1027 return err; 1028 } 1029 EXPORT_SYMBOL(p9_client_clunk); 1030 1031 int p9_client_remove(struct p9_fid *fid) 1032 { 1033 int err; 1034 struct p9_client *clnt; 1035 struct p9_req_t *req; 1036 1037 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1038 err = 0; 1039 clnt = fid->clnt; 1040 1041 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1042 if (IS_ERR(req)) { 1043 err = PTR_ERR(req); 1044 goto error; 1045 } 1046 1047 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1048 1049 p9_free_req(clnt, req); 1050 p9_fid_destroy(fid); 1051 1052 error: 1053 return err; 1054 } 1055 EXPORT_SYMBOL(p9_client_remove); 1056 1057 int 1058 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, 1059 u32 count) 1060 { 1061 int err, rsize, total; 1062 struct p9_client *clnt; 1063 struct p9_req_t *req; 1064 char *dataptr; 1065 1066 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid, 1067 (long long unsigned) offset, count); 1068 err = 0; 1069 clnt = fid->clnt; 1070 total = 0; 1071 1072 rsize = fid->iounit; 1073 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1074 rsize = clnt->msize - P9_IOHDRSZ; 1075 1076 if (count < rsize) 1077 rsize = count; 1078 1079 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize); 1080 if (IS_ERR(req)) { 1081 err = PTR_ERR(req); 1082 goto error; 1083 } 1084 1085 err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr); 1086 if (err) { 1087 p9pdu_dump(1, req->rc); 1088 goto free_and_error; 1089 } 1090 1091 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1092 1093 if (data) { 1094 memmove(data, dataptr, count); 1095 } 1096 1097 if (udata) { 1098 err = copy_to_user(udata, dataptr, count); 1099 if (err) { 1100 err = -EFAULT; 1101 goto free_and_error; 1102 } 1103 } 1104 1105 p9_free_req(clnt, req); 1106 return count; 1107 1108 free_and_error: 1109 p9_free_req(clnt, req); 1110 error: 1111 return err; 1112 } 1113 EXPORT_SYMBOL(p9_client_read); 1114 1115 int 1116 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, 1117 u64 offset, u32 count) 1118 { 1119 int err, rsize, total; 1120 struct p9_client *clnt; 1121 struct p9_req_t *req; 1122 1123 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", 1124 fid->fid, (long long unsigned) offset, count); 1125 err = 0; 1126 clnt = fid->clnt; 1127 total = 0; 1128 1129 rsize = fid->iounit; 1130 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1131 rsize = clnt->msize - P9_IOHDRSZ; 1132 1133 if (count < rsize) 1134 rsize = count; 1135 if (data) 1136 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset, 1137 rsize, data); 1138 else 1139 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset, 1140 rsize, udata); 1141 if (IS_ERR(req)) { 1142 err = PTR_ERR(req); 1143 goto error; 1144 } 1145 1146 err = p9pdu_readf(req->rc, clnt->dotu, "d", &count); 1147 if (err) { 1148 p9pdu_dump(1, req->rc); 1149 goto free_and_error; 1150 } 1151 1152 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1153 1154 p9_free_req(clnt, req); 1155 return count; 1156 1157 free_and_error: 1158 p9_free_req(clnt, req); 1159 error: 1160 return err; 1161 } 1162 EXPORT_SYMBOL(p9_client_write); 1163 1164 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1165 { 1166 int err; 1167 struct p9_client *clnt; 1168 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1169 struct p9_req_t *req; 1170 u16 ignored; 1171 1172 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1173 1174 if (!ret) 1175 return ERR_PTR(-ENOMEM); 1176 1177 err = 0; 1178 clnt = fid->clnt; 1179 1180 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1181 if (IS_ERR(req)) { 1182 err = PTR_ERR(req); 1183 goto error; 1184 } 1185 1186 err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret); 1187 if (err) { 1188 p9pdu_dump(1, req->rc); 1189 p9_free_req(clnt, req); 1190 goto error; 1191 } 1192 1193 P9_DPRINTK(P9_DEBUG_9P, 1194 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1195 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1196 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1197 "<<< uid=%d gid=%d n_muid=%d\n", 1198 ret->size, ret->type, ret->dev, ret->qid.type, 1199 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1200 ret->atime, ret->mtime, (unsigned long long)ret->length, 1201 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1202 ret->n_uid, ret->n_gid, ret->n_muid); 1203 1204 p9_free_req(clnt, req); 1205 return ret; 1206 1207 error: 1208 kfree(ret); 1209 return ERR_PTR(err); 1210 } 1211 EXPORT_SYMBOL(p9_client_stat); 1212 1213 static int p9_client_statsize(struct p9_wstat *wst, int optional) 1214 { 1215 int ret; 1216 1217 /* size[2] type[2] dev[4] qid[13] */ 1218 /* mode[4] atime[4] mtime[4] length[8]*/ 1219 /* name[s] uid[s] gid[s] muid[s] */ 1220 ret = 2+2+4+13+4+4+4+8+2+2+2+2; 1221 1222 if (wst->name) 1223 ret += strlen(wst->name); 1224 if (wst->uid) 1225 ret += strlen(wst->uid); 1226 if (wst->gid) 1227 ret += strlen(wst->gid); 1228 if (wst->muid) 1229 ret += strlen(wst->muid); 1230 1231 if (optional) { 1232 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1233 if (wst->extension) 1234 ret += strlen(wst->extension); 1235 } 1236 1237 return ret; 1238 } 1239 1240 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1241 { 1242 int err; 1243 struct p9_req_t *req; 1244 struct p9_client *clnt; 1245 1246 err = 0; 1247 clnt = fid->clnt; 1248 wst->size = p9_client_statsize(wst, clnt->dotu); 1249 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1250 P9_DPRINTK(P9_DEBUG_9P, 1251 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1252 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1253 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1254 " uid=%d gid=%d n_muid=%d\n", 1255 wst->size, wst->type, wst->dev, wst->qid.type, 1256 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1257 wst->atime, wst->mtime, (unsigned long long)wst->length, 1258 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1259 wst->n_uid, wst->n_gid, wst->n_muid); 1260 1261 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size, wst); 1262 if (IS_ERR(req)) { 1263 err = PTR_ERR(req); 1264 goto error; 1265 } 1266 1267 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1268 1269 p9_free_req(clnt, req); 1270 error: 1271 return err; 1272 } 1273 EXPORT_SYMBOL(p9_client_wstat); 1274