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 * v9fs_parse_options - parse mount options into session structure 64 * @options: options string passed from mount 65 * @v9ses: existing v9fs session 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 * @tags: tags structure from the 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 * @tags: tags structure from the 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) { 415 err = p9_errstr2errno(ename, strlen(ename)); 416 417 /* string match failed */ 418 if (!err) 419 err = -ESERVERFAULT; 420 } 421 422 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename); 423 424 kfree(ename); 425 } else 426 err = 0; 427 428 return err; 429 } 430 431 /** 432 * p9_client_flush - flush (cancel) a request 433 * c: client state 434 * req: request to cancel 435 * 436 * This sents a flush for a particular requests and links 437 * the flush request to the original request. The current 438 * code only supports a single flush request although the protocol 439 * allows for multiple flush requests to be sent for a single request. 440 * 441 */ 442 443 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 444 { 445 struct p9_req_t *req; 446 int16_t oldtag; 447 int err; 448 449 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 450 if (err) 451 return err; 452 453 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 454 455 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 456 if (IS_ERR(req)) 457 return PTR_ERR(req); 458 459 460 /* if we haven't received a response for oldreq, 461 remove it from the list. */ 462 spin_lock(&c->lock); 463 if (oldreq->status == REQ_STATUS_FLSH) 464 list_del(&oldreq->req_list); 465 spin_unlock(&c->lock); 466 467 p9_free_req(c, req); 468 return 0; 469 } 470 471 /** 472 * p9_client_rpc - issue a request and wait for a response 473 * @c: client session 474 * @type: type of request 475 * @fmt: protocol format string (see protocol.c) 476 * 477 * Returns request structure (which client must free using p9_free_req) 478 */ 479 480 static struct p9_req_t * 481 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 482 { 483 va_list ap; 484 int tag, err; 485 struct p9_req_t *req; 486 unsigned long flags; 487 int sigpending; 488 489 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type); 490 491 if (c->status != Connected) 492 return ERR_PTR(-EIO); 493 494 if (signal_pending(current)) { 495 sigpending = 1; 496 clear_thread_flag(TIF_SIGPENDING); 497 } else 498 sigpending = 0; 499 500 tag = P9_NOTAG; 501 if (type != P9_TVERSION) { 502 tag = p9_idpool_get(c->tagpool); 503 if (tag < 0) 504 return ERR_PTR(-ENOMEM); 505 } 506 507 req = p9_tag_alloc(c, tag); 508 if (IS_ERR(req)) 509 return req; 510 511 /* marshall the data */ 512 p9pdu_prepare(req->tc, tag, type); 513 va_start(ap, fmt); 514 err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap); 515 va_end(ap); 516 p9pdu_finalize(req->tc); 517 518 err = c->trans_mod->request(c, req); 519 if (err < 0) { 520 c->status = Disconnected; 521 goto reterr; 522 } 523 524 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag); 525 err = wait_event_interruptible(*req->wq, 526 req->status >= REQ_STATUS_RCVD); 527 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n", 528 req->wq, tag, err); 529 530 if (req->status == REQ_STATUS_ERROR) { 531 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 532 err = req->t_err; 533 } 534 535 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 536 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n"); 537 sigpending = 1; 538 clear_thread_flag(TIF_SIGPENDING); 539 540 if (c->trans_mod->cancel(c, req)) 541 p9_client_flush(c, req); 542 543 /* if we received the response anyway, don't signal error */ 544 if (req->status == REQ_STATUS_RCVD) 545 err = 0; 546 } 547 548 if (sigpending) { 549 spin_lock_irqsave(¤t->sighand->siglock, flags); 550 recalc_sigpending(); 551 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 552 } 553 554 if (err < 0) 555 goto reterr; 556 557 err = p9_check_errors(c, req); 558 if (!err) { 559 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type); 560 return req; 561 } 562 563 reterr: 564 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type, 565 err); 566 p9_free_req(c, req); 567 return ERR_PTR(err); 568 } 569 570 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 571 { 572 int ret; 573 struct p9_fid *fid; 574 unsigned long flags; 575 576 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt); 577 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 578 if (!fid) 579 return ERR_PTR(-ENOMEM); 580 581 ret = p9_idpool_get(clnt->fidpool); 582 if (ret < 0) { 583 ret = -ENOSPC; 584 goto error; 585 } 586 fid->fid = ret; 587 588 memset(&fid->qid, 0, sizeof(struct p9_qid)); 589 fid->mode = -1; 590 fid->rdir_fpos = 0; 591 fid->uid = current_fsuid(); 592 fid->clnt = clnt; 593 fid->aux = NULL; 594 595 spin_lock_irqsave(&clnt->lock, flags); 596 list_add(&fid->flist, &clnt->fidlist); 597 spin_unlock_irqrestore(&clnt->lock, flags); 598 599 return fid; 600 601 error: 602 kfree(fid); 603 return ERR_PTR(ret); 604 } 605 606 static void p9_fid_destroy(struct p9_fid *fid) 607 { 608 struct p9_client *clnt; 609 unsigned long flags; 610 611 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid); 612 clnt = fid->clnt; 613 p9_idpool_put(fid->fid, clnt->fidpool); 614 spin_lock_irqsave(&clnt->lock, flags); 615 list_del(&fid->flist); 616 spin_unlock_irqrestore(&clnt->lock, flags); 617 kfree(fid); 618 } 619 620 int p9_client_version(struct p9_client *c) 621 { 622 int err = 0; 623 struct p9_req_t *req; 624 char *version; 625 int msize; 626 627 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n", 628 c->msize, c->dotu); 629 req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize, 630 c->dotu ? "9P2000.u" : "9P2000"); 631 if (IS_ERR(req)) 632 return PTR_ERR(req); 633 634 err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version); 635 if (err) { 636 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err); 637 p9pdu_dump(1, req->rc); 638 goto error; 639 } 640 641 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 642 if (!memcmp(version, "9P2000.u", 8)) 643 c->dotu = 1; 644 else if (!memcmp(version, "9P2000", 6)) 645 c->dotu = 0; 646 else { 647 err = -EREMOTEIO; 648 goto error; 649 } 650 651 if (msize < c->msize) 652 c->msize = msize; 653 654 error: 655 kfree(version); 656 p9_free_req(c, req); 657 658 return err; 659 } 660 EXPORT_SYMBOL(p9_client_version); 661 662 struct p9_client *p9_client_create(const char *dev_name, char *options) 663 { 664 int err; 665 struct p9_client *clnt; 666 667 err = 0; 668 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 669 if (!clnt) 670 return ERR_PTR(-ENOMEM); 671 672 clnt->trans_mod = NULL; 673 clnt->trans = NULL; 674 spin_lock_init(&clnt->lock); 675 INIT_LIST_HEAD(&clnt->fidlist); 676 clnt->fidpool = p9_idpool_create(); 677 if (IS_ERR(clnt->fidpool)) { 678 err = PTR_ERR(clnt->fidpool); 679 clnt->fidpool = NULL; 680 goto error; 681 } 682 683 p9_tag_init(clnt); 684 685 err = parse_opts(options, clnt); 686 if (err < 0) 687 goto error; 688 689 if (!clnt->trans_mod) 690 clnt->trans_mod = v9fs_get_default_trans(); 691 692 if (clnt->trans_mod == NULL) { 693 err = -EPROTONOSUPPORT; 694 P9_DPRINTK(P9_DEBUG_ERROR, 695 "No transport defined or default transport\n"); 696 goto error; 697 } 698 699 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n", 700 clnt, clnt->trans_mod, clnt->msize, clnt->dotu); 701 702 err = clnt->trans_mod->create(clnt, dev_name, options); 703 if (err) 704 goto error; 705 706 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) 707 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; 708 709 err = p9_client_version(clnt); 710 if (err) 711 goto error; 712 713 return clnt; 714 715 error: 716 p9_client_destroy(clnt); 717 return ERR_PTR(err); 718 } 719 EXPORT_SYMBOL(p9_client_create); 720 721 void p9_client_destroy(struct p9_client *clnt) 722 { 723 struct p9_fid *fid, *fidptr; 724 725 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt); 726 727 if (clnt->trans_mod) 728 clnt->trans_mod->close(clnt); 729 730 v9fs_put_trans(clnt->trans_mod); 731 732 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) 733 p9_fid_destroy(fid); 734 735 if (clnt->fidpool) 736 p9_idpool_destroy(clnt->fidpool); 737 738 p9_tag_cleanup(clnt); 739 740 kfree(clnt); 741 } 742 EXPORT_SYMBOL(p9_client_destroy); 743 744 void p9_client_disconnect(struct p9_client *clnt) 745 { 746 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); 747 clnt->status = Disconnected; 748 } 749 EXPORT_SYMBOL(p9_client_disconnect); 750 751 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 752 char *uname, u32 n_uname, char *aname) 753 { 754 int err; 755 struct p9_req_t *req; 756 struct p9_fid *fid; 757 struct p9_qid qid; 758 759 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 760 afid ? afid->fid : -1, uname, aname); 761 err = 0; 762 763 fid = p9_fid_create(clnt); 764 if (IS_ERR(fid)) { 765 err = PTR_ERR(fid); 766 fid = NULL; 767 goto error; 768 } 769 770 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, 771 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 772 if (IS_ERR(req)) { 773 err = PTR_ERR(req); 774 goto error; 775 } 776 777 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid); 778 if (err) { 779 p9pdu_dump(1, req->rc); 780 p9_free_req(clnt, req); 781 goto error; 782 } 783 784 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 785 qid.type, 786 (unsigned long long)qid.path, 787 qid.version); 788 789 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 790 791 p9_free_req(clnt, req); 792 return fid; 793 794 error: 795 if (fid) 796 p9_fid_destroy(fid); 797 return ERR_PTR(err); 798 } 799 EXPORT_SYMBOL(p9_client_attach); 800 801 struct p9_fid * 802 p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname) 803 { 804 int err; 805 struct p9_req_t *req; 806 struct p9_qid qid; 807 struct p9_fid *afid; 808 809 P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname); 810 err = 0; 811 812 afid = p9_fid_create(clnt); 813 if (IS_ERR(afid)) { 814 err = PTR_ERR(afid); 815 afid = NULL; 816 goto error; 817 } 818 819 req = p9_client_rpc(clnt, P9_TAUTH, "dss?d", 820 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 821 if (IS_ERR(req)) { 822 err = PTR_ERR(req); 823 goto error; 824 } 825 826 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid); 827 if (err) { 828 p9pdu_dump(1, req->rc); 829 p9_free_req(clnt, req); 830 goto error; 831 } 832 833 P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n", 834 qid.type, 835 (unsigned long long)qid.path, 836 qid.version); 837 838 memmove(&afid->qid, &qid, sizeof(struct p9_qid)); 839 p9_free_req(clnt, req); 840 return afid; 841 842 error: 843 if (afid) 844 p9_fid_destroy(afid); 845 return ERR_PTR(err); 846 } 847 EXPORT_SYMBOL(p9_client_auth); 848 849 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, 850 int clone) 851 { 852 int err; 853 struct p9_client *clnt; 854 struct p9_fid *fid; 855 struct p9_qid *wqids; 856 struct p9_req_t *req; 857 int16_t nwqids, count; 858 859 err = 0; 860 clnt = oldfid->clnt; 861 if (clone) { 862 fid = p9_fid_create(clnt); 863 if (IS_ERR(fid)) { 864 err = PTR_ERR(fid); 865 fid = NULL; 866 goto error; 867 } 868 869 fid->uid = oldfid->uid; 870 } else 871 fid = oldfid; 872 873 874 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n", 875 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 876 877 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 878 nwname, wnames); 879 if (IS_ERR(req)) { 880 err = PTR_ERR(req); 881 goto error; 882 } 883 884 err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids); 885 if (err) { 886 p9pdu_dump(1, req->rc); 887 p9_free_req(clnt, req); 888 goto clunk_fid; 889 } 890 p9_free_req(clnt, req); 891 892 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 893 894 if (nwqids != nwname) { 895 err = -ENOENT; 896 goto clunk_fid; 897 } 898 899 for (count = 0; count < nwqids; count++) 900 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 901 count, wqids[count].type, 902 (unsigned long long)wqids[count].path, 903 wqids[count].version); 904 905 if (nwname) 906 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 907 else 908 fid->qid = oldfid->qid; 909 910 return fid; 911 912 clunk_fid: 913 p9_client_clunk(fid); 914 fid = NULL; 915 916 error: 917 if (fid && (fid != oldfid)) 918 p9_fid_destroy(fid); 919 920 return ERR_PTR(err); 921 } 922 EXPORT_SYMBOL(p9_client_walk); 923 924 int p9_client_open(struct p9_fid *fid, int mode) 925 { 926 int err; 927 struct p9_client *clnt; 928 struct p9_req_t *req; 929 struct p9_qid qid; 930 int iounit; 931 932 P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode); 933 err = 0; 934 clnt = fid->clnt; 935 936 if (fid->mode != -1) 937 return -EINVAL; 938 939 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 940 if (IS_ERR(req)) { 941 err = PTR_ERR(req); 942 goto error; 943 } 944 945 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit); 946 if (err) { 947 p9pdu_dump(1, req->rc); 948 goto free_and_error; 949 } 950 951 P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n", 952 qid.type, 953 (unsigned long long)qid.path, 954 qid.version, iounit); 955 956 fid->mode = mode; 957 fid->iounit = iounit; 958 959 free_and_error: 960 p9_free_req(clnt, req); 961 error: 962 return err; 963 } 964 EXPORT_SYMBOL(p9_client_open); 965 966 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, 967 char *extension) 968 { 969 int err; 970 struct p9_client *clnt; 971 struct p9_req_t *req; 972 struct p9_qid qid; 973 int iounit; 974 975 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 976 fid->fid, name, perm, mode); 977 err = 0; 978 clnt = fid->clnt; 979 980 if (fid->mode != -1) 981 return -EINVAL; 982 983 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 984 mode, extension); 985 if (IS_ERR(req)) { 986 err = PTR_ERR(req); 987 goto error; 988 } 989 990 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit); 991 if (err) { 992 p9pdu_dump(1, req->rc); 993 goto free_and_error; 994 } 995 996 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 997 qid.type, 998 (unsigned long long)qid.path, 999 qid.version, iounit); 1000 1001 fid->mode = mode; 1002 fid->iounit = iounit; 1003 1004 free_and_error: 1005 p9_free_req(clnt, req); 1006 error: 1007 return err; 1008 } 1009 EXPORT_SYMBOL(p9_client_fcreate); 1010 1011 int p9_client_clunk(struct p9_fid *fid) 1012 { 1013 int err; 1014 struct p9_client *clnt; 1015 struct p9_req_t *req; 1016 1017 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid); 1018 err = 0; 1019 clnt = fid->clnt; 1020 1021 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1022 if (IS_ERR(req)) { 1023 err = PTR_ERR(req); 1024 goto error; 1025 } 1026 1027 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1028 1029 p9_free_req(clnt, req); 1030 p9_fid_destroy(fid); 1031 1032 error: 1033 return err; 1034 } 1035 EXPORT_SYMBOL(p9_client_clunk); 1036 1037 int p9_client_remove(struct p9_fid *fid) 1038 { 1039 int err; 1040 struct p9_client *clnt; 1041 struct p9_req_t *req; 1042 1043 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1044 err = 0; 1045 clnt = fid->clnt; 1046 1047 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1048 if (IS_ERR(req)) { 1049 err = PTR_ERR(req); 1050 goto error; 1051 } 1052 1053 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1054 1055 p9_free_req(clnt, req); 1056 p9_fid_destroy(fid); 1057 1058 error: 1059 return err; 1060 } 1061 EXPORT_SYMBOL(p9_client_remove); 1062 1063 int 1064 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, 1065 u32 count) 1066 { 1067 int err, rsize, total; 1068 struct p9_client *clnt; 1069 struct p9_req_t *req; 1070 char *dataptr; 1071 1072 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid, 1073 (long long unsigned) offset, count); 1074 err = 0; 1075 clnt = fid->clnt; 1076 total = 0; 1077 1078 rsize = fid->iounit; 1079 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1080 rsize = clnt->msize - P9_IOHDRSZ; 1081 1082 if (count < rsize) 1083 rsize = count; 1084 1085 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize); 1086 if (IS_ERR(req)) { 1087 err = PTR_ERR(req); 1088 goto error; 1089 } 1090 1091 err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr); 1092 if (err) { 1093 p9pdu_dump(1, req->rc); 1094 goto free_and_error; 1095 } 1096 1097 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1098 1099 if (data) { 1100 memmove(data, dataptr, count); 1101 } 1102 1103 if (udata) { 1104 err = copy_to_user(udata, dataptr, count); 1105 if (err) { 1106 err = -EFAULT; 1107 goto free_and_error; 1108 } 1109 } 1110 1111 p9_free_req(clnt, req); 1112 return count; 1113 1114 free_and_error: 1115 p9_free_req(clnt, req); 1116 error: 1117 return err; 1118 } 1119 EXPORT_SYMBOL(p9_client_read); 1120 1121 int 1122 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, 1123 u64 offset, u32 count) 1124 { 1125 int err, rsize, total; 1126 struct p9_client *clnt; 1127 struct p9_req_t *req; 1128 1129 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", 1130 fid->fid, (long long unsigned) offset, count); 1131 err = 0; 1132 clnt = fid->clnt; 1133 total = 0; 1134 1135 rsize = fid->iounit; 1136 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1137 rsize = clnt->msize - P9_IOHDRSZ; 1138 1139 if (count < rsize) 1140 rsize = count; 1141 if (data) 1142 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset, 1143 rsize, data); 1144 else 1145 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset, 1146 rsize, udata); 1147 if (IS_ERR(req)) { 1148 err = PTR_ERR(req); 1149 goto error; 1150 } 1151 1152 err = p9pdu_readf(req->rc, clnt->dotu, "d", &count); 1153 if (err) { 1154 p9pdu_dump(1, req->rc); 1155 goto free_and_error; 1156 } 1157 1158 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1159 1160 p9_free_req(clnt, req); 1161 return count; 1162 1163 free_and_error: 1164 p9_free_req(clnt, req); 1165 error: 1166 return err; 1167 } 1168 EXPORT_SYMBOL(p9_client_write); 1169 1170 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1171 { 1172 int err; 1173 struct p9_client *clnt; 1174 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1175 struct p9_req_t *req; 1176 u16 ignored; 1177 1178 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1179 1180 if (!ret) 1181 return ERR_PTR(-ENOMEM); 1182 1183 err = 0; 1184 clnt = fid->clnt; 1185 1186 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1187 if (IS_ERR(req)) { 1188 err = PTR_ERR(req); 1189 goto error; 1190 } 1191 1192 err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret); 1193 if (err) { 1194 p9pdu_dump(1, req->rc); 1195 p9_free_req(clnt, req); 1196 goto error; 1197 } 1198 1199 P9_DPRINTK(P9_DEBUG_9P, 1200 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1201 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1202 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1203 "<<< uid=%d gid=%d n_muid=%d\n", 1204 ret->size, ret->type, ret->dev, ret->qid.type, 1205 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1206 ret->atime, ret->mtime, (unsigned long long)ret->length, 1207 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1208 ret->n_uid, ret->n_gid, ret->n_muid); 1209 1210 p9_free_req(clnt, req); 1211 return ret; 1212 1213 error: 1214 kfree(ret); 1215 return ERR_PTR(err); 1216 } 1217 EXPORT_SYMBOL(p9_client_stat); 1218 1219 static int p9_client_statsize(struct p9_wstat *wst, int optional) 1220 { 1221 int ret; 1222 1223 /* size[2] type[2] dev[4] qid[13] */ 1224 /* mode[4] atime[4] mtime[4] length[8]*/ 1225 /* name[s] uid[s] gid[s] muid[s] */ 1226 ret = 2+2+4+13+4+4+4+8+2+2+2+2; 1227 1228 if (wst->name) 1229 ret += strlen(wst->name); 1230 if (wst->uid) 1231 ret += strlen(wst->uid); 1232 if (wst->gid) 1233 ret += strlen(wst->gid); 1234 if (wst->muid) 1235 ret += strlen(wst->muid); 1236 1237 if (optional) { 1238 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1239 if (wst->extension) 1240 ret += strlen(wst->extension); 1241 } 1242 1243 return ret; 1244 } 1245 1246 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1247 { 1248 int err; 1249 struct p9_req_t *req; 1250 struct p9_client *clnt; 1251 1252 err = 0; 1253 clnt = fid->clnt; 1254 wst->size = p9_client_statsize(wst, clnt->dotu); 1255 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1256 P9_DPRINTK(P9_DEBUG_9P, 1257 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1258 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1259 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1260 " uid=%d gid=%d n_muid=%d\n", 1261 wst->size, wst->type, wst->dev, wst->qid.type, 1262 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1263 wst->atime, wst->mtime, (unsigned long long)wst->length, 1264 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1265 wst->n_uid, wst->n_gid, wst->n_muid); 1266 1267 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size, wst); 1268 if (IS_ERR(req)) { 1269 err = PTR_ERR(req); 1270 goto error; 1271 } 1272 1273 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1274 1275 p9_free_req(clnt, req); 1276 error: 1277 return err; 1278 } 1279 EXPORT_SYMBOL(p9_client_wstat); 1280