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/slab.h> 33 #include <linux/sched.h> 34 #include <linux/uaccess.h> 35 #include <net/9p/9p.h> 36 #include <linux/parser.h> 37 #include <net/9p/client.h> 38 #include <net/9p/transport.h> 39 #include "protocol.h" 40 41 /* 42 * Client Option Parsing (code inspired by NFS code) 43 * - a little lazy - parse all client options 44 */ 45 46 enum { 47 Opt_msize, 48 Opt_trans, 49 Opt_legacy, 50 Opt_version, 51 Opt_err, 52 }; 53 54 static const match_table_t tokens = { 55 {Opt_msize, "msize=%u"}, 56 {Opt_legacy, "noextend"}, 57 {Opt_trans, "trans=%s"}, 58 {Opt_version, "version=%s"}, 59 {Opt_err, NULL}, 60 }; 61 62 inline int p9_is_proto_dotl(struct p9_client *clnt) 63 { 64 return clnt->proto_version == p9_proto_2000L; 65 } 66 EXPORT_SYMBOL(p9_is_proto_dotl); 67 68 inline int p9_is_proto_dotu(struct p9_client *clnt) 69 { 70 return clnt->proto_version == p9_proto_2000u; 71 } 72 EXPORT_SYMBOL(p9_is_proto_dotu); 73 74 /* Interpret mount option for protocol version */ 75 static int get_protocol_version(const substring_t *name) 76 { 77 int version = -EINVAL; 78 79 if (!strncmp("9p2000", name->from, name->to-name->from)) { 80 version = p9_proto_legacy; 81 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n"); 82 } else if (!strncmp("9p2000.u", name->from, name->to-name->from)) { 83 version = p9_proto_2000u; 84 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 85 } else if (!strncmp("9p2000.L", name->from, name->to-name->from)) { 86 version = p9_proto_2000L; 87 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 88 } else { 89 P9_DPRINTK(P9_DEBUG_ERROR, "Unknown protocol version %s. ", 90 name->from); 91 } 92 return version; 93 } 94 95 static struct p9_req_t * 96 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 97 98 /** 99 * parse_options - parse mount options into client structure 100 * @opts: options string passed from mount 101 * @clnt: existing v9fs client information 102 * 103 * Return 0 upon success, -ERRNO upon failure 104 */ 105 106 static int parse_opts(char *opts, struct p9_client *clnt) 107 { 108 char *options, *tmp_options; 109 char *p; 110 substring_t args[MAX_OPT_ARGS]; 111 int option; 112 int ret = 0; 113 114 clnt->proto_version = p9_proto_2000u; 115 clnt->msize = 8192; 116 117 if (!opts) 118 return 0; 119 120 tmp_options = kstrdup(opts, GFP_KERNEL); 121 if (!tmp_options) { 122 P9_DPRINTK(P9_DEBUG_ERROR, 123 "failed to allocate copy of option string\n"); 124 return -ENOMEM; 125 } 126 options = tmp_options; 127 128 while ((p = strsep(&options, ",")) != NULL) { 129 int token; 130 if (!*p) 131 continue; 132 token = match_token(p, tokens, args); 133 if (token < Opt_trans) { 134 int r = match_int(&args[0], &option); 135 if (r < 0) { 136 P9_DPRINTK(P9_DEBUG_ERROR, 137 "integer field, but no integer?\n"); 138 ret = r; 139 continue; 140 } 141 } 142 switch (token) { 143 case Opt_msize: 144 clnt->msize = option; 145 break; 146 case Opt_trans: 147 clnt->trans_mod = v9fs_get_trans_by_name(&args[0]); 148 if(clnt->trans_mod == NULL) { 149 P9_DPRINTK(P9_DEBUG_ERROR, 150 "Could not find request transport: %s\n", 151 (char *) &args[0]); 152 ret = -EINVAL; 153 goto free_and_return; 154 } 155 break; 156 case Opt_legacy: 157 clnt->proto_version = p9_proto_legacy; 158 break; 159 case Opt_version: 160 ret = get_protocol_version(&args[0]); 161 if (ret == -EINVAL) 162 goto free_and_return; 163 clnt->proto_version = ret; 164 break; 165 default: 166 continue; 167 } 168 } 169 170 free_and_return: 171 kfree(tmp_options); 172 return ret; 173 } 174 175 /** 176 * p9_tag_alloc - lookup/allocate a request by tag 177 * @c: client session to lookup tag within 178 * @tag: numeric id for transaction 179 * 180 * this is a simple array lookup, but will grow the 181 * request_slots as necessary to accomodate transaction 182 * ids which did not previously have a slot. 183 * 184 * this code relies on the client spinlock to manage locks, its 185 * possible we should switch to something else, but I'd rather 186 * stick with something low-overhead for the common case. 187 * 188 */ 189 190 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag) 191 { 192 unsigned long flags; 193 int row, col; 194 struct p9_req_t *req; 195 196 /* This looks up the original request by tag so we know which 197 * buffer to read the data into */ 198 tag++; 199 200 if (tag >= c->max_tag) { 201 spin_lock_irqsave(&c->lock, flags); 202 /* check again since original check was outside of lock */ 203 while (tag >= c->max_tag) { 204 row = (tag / P9_ROW_MAXTAG); 205 c->reqs[row] = kcalloc(P9_ROW_MAXTAG, 206 sizeof(struct p9_req_t), GFP_ATOMIC); 207 208 if (!c->reqs[row]) { 209 printk(KERN_ERR "Couldn't grow tag array\n"); 210 spin_unlock_irqrestore(&c->lock, flags); 211 return ERR_PTR(-ENOMEM); 212 } 213 for (col = 0; col < P9_ROW_MAXTAG; col++) { 214 c->reqs[row][col].status = REQ_STATUS_IDLE; 215 c->reqs[row][col].tc = NULL; 216 } 217 c->max_tag += P9_ROW_MAXTAG; 218 } 219 spin_unlock_irqrestore(&c->lock, flags); 220 } 221 row = tag / P9_ROW_MAXTAG; 222 col = tag % P9_ROW_MAXTAG; 223 224 req = &c->reqs[row][col]; 225 if (!req->tc) { 226 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL); 227 if (!req->wq) { 228 printk(KERN_ERR "Couldn't grow tag array\n"); 229 return ERR_PTR(-ENOMEM); 230 } 231 init_waitqueue_head(req->wq); 232 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize, 233 GFP_KERNEL); 234 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize, 235 GFP_KERNEL); 236 if ((!req->tc) || (!req->rc)) { 237 printk(KERN_ERR "Couldn't grow tag array\n"); 238 kfree(req->tc); 239 kfree(req->rc); 240 kfree(req->wq); 241 req->tc = req->rc = NULL; 242 req->wq = NULL; 243 return ERR_PTR(-ENOMEM); 244 } 245 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall); 246 req->tc->capacity = c->msize; 247 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall); 248 req->rc->capacity = c->msize; 249 } 250 251 p9pdu_reset(req->tc); 252 p9pdu_reset(req->rc); 253 254 req->tc->tag = tag-1; 255 req->status = REQ_STATUS_ALLOC; 256 257 return &c->reqs[row][col]; 258 } 259 260 /** 261 * p9_tag_lookup - lookup a request by tag 262 * @c: client session to lookup tag within 263 * @tag: numeric id for transaction 264 * 265 */ 266 267 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 268 { 269 int row, col; 270 271 /* This looks up the original request by tag so we know which 272 * buffer to read the data into */ 273 tag++; 274 275 BUG_ON(tag >= c->max_tag); 276 277 row = tag / P9_ROW_MAXTAG; 278 col = tag % P9_ROW_MAXTAG; 279 280 return &c->reqs[row][col]; 281 } 282 EXPORT_SYMBOL(p9_tag_lookup); 283 284 /** 285 * p9_tag_init - setup tags structure and contents 286 * @c: v9fs client struct 287 * 288 * This initializes the tags structure for each client instance. 289 * 290 */ 291 292 static int p9_tag_init(struct p9_client *c) 293 { 294 int err = 0; 295 296 c->tagpool = p9_idpool_create(); 297 if (IS_ERR(c->tagpool)) { 298 err = PTR_ERR(c->tagpool); 299 c->tagpool = NULL; 300 goto error; 301 } 302 303 p9_idpool_get(c->tagpool); /* reserve tag 0 */ 304 305 c->max_tag = 0; 306 error: 307 return err; 308 } 309 310 /** 311 * p9_tag_cleanup - cleans up tags structure and reclaims resources 312 * @c: v9fs client struct 313 * 314 * This frees resources associated with the tags structure 315 * 316 */ 317 static void p9_tag_cleanup(struct p9_client *c) 318 { 319 int row, col; 320 321 /* check to insure all requests are idle */ 322 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 323 for (col = 0; col < P9_ROW_MAXTAG; col++) { 324 if (c->reqs[row][col].status != REQ_STATUS_IDLE) { 325 P9_DPRINTK(P9_DEBUG_MUX, 326 "Attempting to cleanup non-free tag %d,%d\n", 327 row, col); 328 /* TODO: delay execution of cleanup */ 329 return; 330 } 331 } 332 } 333 334 if (c->tagpool) { 335 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */ 336 p9_idpool_destroy(c->tagpool); 337 } 338 339 /* free requests associated with tags */ 340 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 341 for (col = 0; col < P9_ROW_MAXTAG; col++) { 342 kfree(c->reqs[row][col].wq); 343 kfree(c->reqs[row][col].tc); 344 kfree(c->reqs[row][col].rc); 345 } 346 kfree(c->reqs[row]); 347 } 348 c->max_tag = 0; 349 } 350 351 /** 352 * p9_free_req - free a request and clean-up as necessary 353 * c: client state 354 * r: request to release 355 * 356 */ 357 358 static void p9_free_req(struct p9_client *c, struct p9_req_t *r) 359 { 360 int tag = r->tc->tag; 361 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 362 363 r->status = REQ_STATUS_IDLE; 364 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) 365 p9_idpool_put(tag, c->tagpool); 366 } 367 368 /** 369 * p9_client_cb - call back from transport to client 370 * c: client state 371 * req: request received 372 * 373 */ 374 void p9_client_cb(struct p9_client *c, struct p9_req_t *req) 375 { 376 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); 377 wake_up(req->wq); 378 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); 379 } 380 EXPORT_SYMBOL(p9_client_cb); 381 382 /** 383 * p9_parse_header - parse header arguments out of a packet 384 * @pdu: packet to parse 385 * @size: size of packet 386 * @type: type of request 387 * @tag: tag of packet 388 * @rewind: set if we need to rewind offset afterwards 389 */ 390 391 int 392 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 393 int rewind) 394 { 395 int8_t r_type; 396 int16_t r_tag; 397 int32_t r_size; 398 int offset = pdu->offset; 399 int err; 400 401 pdu->offset = 0; 402 if (pdu->size == 0) 403 pdu->size = 7; 404 405 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 406 if (err) 407 goto rewind_and_exit; 408 409 pdu->size = r_size; 410 pdu->id = r_type; 411 pdu->tag = r_tag; 412 413 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size, 414 pdu->id, pdu->tag); 415 416 if (type) 417 *type = r_type; 418 if (tag) 419 *tag = r_tag; 420 if (size) 421 *size = r_size; 422 423 424 rewind_and_exit: 425 if (rewind) 426 pdu->offset = offset; 427 return err; 428 } 429 EXPORT_SYMBOL(p9_parse_header); 430 431 /** 432 * p9_check_errors - check 9p packet for error return and process it 433 * @c: current client instance 434 * @req: request to parse and check for error conditions 435 * 436 * returns error code if one is discovered, otherwise returns 0 437 * 438 * this will have to be more complicated if we have multiple 439 * error packet types 440 */ 441 442 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 443 { 444 int8_t type; 445 int err; 446 447 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 448 if (err) { 449 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 450 return err; 451 } 452 453 if (type == P9_RERROR) { 454 int ecode; 455 char *ename; 456 457 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 458 &ename, &ecode); 459 if (err) { 460 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", 461 err); 462 return err; 463 } 464 465 if (p9_is_proto_dotu(c) || 466 p9_is_proto_dotl(c)) 467 err = -ecode; 468 469 if (!err || !IS_ERR_VALUE(err)) 470 err = p9_errstr2errno(ename, strlen(ename)); 471 472 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename); 473 474 kfree(ename); 475 } else 476 err = 0; 477 478 return err; 479 } 480 481 /** 482 * p9_client_flush - flush (cancel) a request 483 * @c: client state 484 * @oldreq: request to cancel 485 * 486 * This sents a flush for a particular requests and links 487 * the flush request to the original request. The current 488 * code only supports a single flush request although the protocol 489 * allows for multiple flush requests to be sent for a single request. 490 * 491 */ 492 493 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 494 { 495 struct p9_req_t *req; 496 int16_t oldtag; 497 int err; 498 499 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 500 if (err) 501 return err; 502 503 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 504 505 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 506 if (IS_ERR(req)) 507 return PTR_ERR(req); 508 509 510 /* if we haven't received a response for oldreq, 511 remove it from the list. */ 512 spin_lock(&c->lock); 513 if (oldreq->status == REQ_STATUS_FLSH) 514 list_del(&oldreq->req_list); 515 spin_unlock(&c->lock); 516 517 p9_free_req(c, req); 518 return 0; 519 } 520 521 /** 522 * p9_client_rpc - issue a request and wait for a response 523 * @c: client session 524 * @type: type of request 525 * @fmt: protocol format string (see protocol.c) 526 * 527 * Returns request structure (which client must free using p9_free_req) 528 */ 529 530 static struct p9_req_t * 531 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 532 { 533 va_list ap; 534 int tag, err; 535 struct p9_req_t *req; 536 unsigned long flags; 537 int sigpending; 538 539 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type); 540 541 /* we allow for any status other than disconnected */ 542 if (c->status == Disconnected) 543 return ERR_PTR(-EIO); 544 545 /* if status is begin_disconnected we allow only clunk request */ 546 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 547 return ERR_PTR(-EIO); 548 549 if (signal_pending(current)) { 550 sigpending = 1; 551 clear_thread_flag(TIF_SIGPENDING); 552 } else 553 sigpending = 0; 554 555 tag = P9_NOTAG; 556 if (type != P9_TVERSION) { 557 tag = p9_idpool_get(c->tagpool); 558 if (tag < 0) 559 return ERR_PTR(-ENOMEM); 560 } 561 562 req = p9_tag_alloc(c, tag); 563 if (IS_ERR(req)) 564 return req; 565 566 /* marshall the data */ 567 p9pdu_prepare(req->tc, tag, type); 568 va_start(ap, fmt); 569 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 570 va_end(ap); 571 p9pdu_finalize(req->tc); 572 573 err = c->trans_mod->request(c, req); 574 if (err < 0) { 575 c->status = Disconnected; 576 goto reterr; 577 } 578 579 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag); 580 err = wait_event_interruptible(*req->wq, 581 req->status >= REQ_STATUS_RCVD); 582 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n", 583 req->wq, tag, err); 584 585 if (req->status == REQ_STATUS_ERROR) { 586 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 587 err = req->t_err; 588 } 589 590 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 591 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n"); 592 sigpending = 1; 593 clear_thread_flag(TIF_SIGPENDING); 594 595 if (c->trans_mod->cancel(c, req)) 596 p9_client_flush(c, req); 597 598 /* if we received the response anyway, don't signal error */ 599 if (req->status == REQ_STATUS_RCVD) 600 err = 0; 601 } 602 603 if (sigpending) { 604 spin_lock_irqsave(¤t->sighand->siglock, flags); 605 recalc_sigpending(); 606 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 607 } 608 609 if (err < 0) 610 goto reterr; 611 612 err = p9_check_errors(c, req); 613 if (!err) { 614 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type); 615 return req; 616 } 617 618 reterr: 619 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type, 620 err); 621 p9_free_req(c, req); 622 return ERR_PTR(err); 623 } 624 625 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 626 { 627 int ret; 628 struct p9_fid *fid; 629 unsigned long flags; 630 631 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt); 632 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 633 if (!fid) 634 return ERR_PTR(-ENOMEM); 635 636 ret = p9_idpool_get(clnt->fidpool); 637 if (ret < 0) { 638 ret = -ENOSPC; 639 goto error; 640 } 641 fid->fid = ret; 642 643 memset(&fid->qid, 0, sizeof(struct p9_qid)); 644 fid->mode = -1; 645 fid->uid = current_fsuid(); 646 fid->clnt = clnt; 647 fid->rdir = NULL; 648 spin_lock_irqsave(&clnt->lock, flags); 649 list_add(&fid->flist, &clnt->fidlist); 650 spin_unlock_irqrestore(&clnt->lock, flags); 651 652 return fid; 653 654 error: 655 kfree(fid); 656 return ERR_PTR(ret); 657 } 658 659 static void p9_fid_destroy(struct p9_fid *fid) 660 { 661 struct p9_client *clnt; 662 unsigned long flags; 663 664 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid); 665 clnt = fid->clnt; 666 p9_idpool_put(fid->fid, clnt->fidpool); 667 spin_lock_irqsave(&clnt->lock, flags); 668 list_del(&fid->flist); 669 spin_unlock_irqrestore(&clnt->lock, flags); 670 kfree(fid->rdir); 671 kfree(fid); 672 } 673 674 static int p9_client_version(struct p9_client *c) 675 { 676 int err = 0; 677 struct p9_req_t *req; 678 char *version; 679 int msize; 680 681 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 682 c->msize, c->proto_version); 683 684 switch (c->proto_version) { 685 case p9_proto_2000L: 686 req = p9_client_rpc(c, P9_TVERSION, "ds", 687 c->msize, "9P2000.L"); 688 break; 689 case p9_proto_2000u: 690 req = p9_client_rpc(c, P9_TVERSION, "ds", 691 c->msize, "9P2000.u"); 692 break; 693 case p9_proto_legacy: 694 req = p9_client_rpc(c, P9_TVERSION, "ds", 695 c->msize, "9P2000"); 696 break; 697 default: 698 return -EINVAL; 699 break; 700 } 701 702 if (IS_ERR(req)) 703 return PTR_ERR(req); 704 705 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 706 if (err) { 707 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err); 708 p9pdu_dump(1, req->rc); 709 goto error; 710 } 711 712 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 713 if (!strncmp(version, "9P2000.L", 8)) 714 c->proto_version = p9_proto_2000L; 715 else if (!strncmp(version, "9P2000.u", 8)) 716 c->proto_version = p9_proto_2000u; 717 else if (!strncmp(version, "9P2000", 6)) 718 c->proto_version = p9_proto_legacy; 719 else { 720 err = -EREMOTEIO; 721 goto error; 722 } 723 724 if (msize < c->msize) 725 c->msize = msize; 726 727 error: 728 kfree(version); 729 p9_free_req(c, req); 730 731 return err; 732 } 733 734 struct p9_client *p9_client_create(const char *dev_name, char *options) 735 { 736 int err; 737 struct p9_client *clnt; 738 739 err = 0; 740 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 741 if (!clnt) 742 return ERR_PTR(-ENOMEM); 743 744 clnt->trans_mod = NULL; 745 clnt->trans = NULL; 746 spin_lock_init(&clnt->lock); 747 INIT_LIST_HEAD(&clnt->fidlist); 748 749 p9_tag_init(clnt); 750 751 err = parse_opts(options, clnt); 752 if (err < 0) 753 goto free_client; 754 755 if (!clnt->trans_mod) 756 clnt->trans_mod = v9fs_get_default_trans(); 757 758 if (clnt->trans_mod == NULL) { 759 err = -EPROTONOSUPPORT; 760 P9_DPRINTK(P9_DEBUG_ERROR, 761 "No transport defined or default transport\n"); 762 goto free_client; 763 } 764 765 clnt->fidpool = p9_idpool_create(); 766 if (IS_ERR(clnt->fidpool)) { 767 err = PTR_ERR(clnt->fidpool); 768 clnt->fidpool = NULL; 769 goto put_trans; 770 } 771 772 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 773 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 774 775 err = clnt->trans_mod->create(clnt, dev_name, options); 776 if (err) 777 goto destroy_fidpool; 778 779 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) 780 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; 781 782 err = p9_client_version(clnt); 783 if (err) 784 goto close_trans; 785 786 return clnt; 787 788 close_trans: 789 clnt->trans_mod->close(clnt); 790 destroy_fidpool: 791 p9_idpool_destroy(clnt->fidpool); 792 put_trans: 793 v9fs_put_trans(clnt->trans_mod); 794 free_client: 795 kfree(clnt); 796 return ERR_PTR(err); 797 } 798 EXPORT_SYMBOL(p9_client_create); 799 800 void p9_client_destroy(struct p9_client *clnt) 801 { 802 struct p9_fid *fid, *fidptr; 803 804 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt); 805 806 if (clnt->trans_mod) 807 clnt->trans_mod->close(clnt); 808 809 v9fs_put_trans(clnt->trans_mod); 810 811 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { 812 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid); 813 p9_fid_destroy(fid); 814 } 815 816 if (clnt->fidpool) 817 p9_idpool_destroy(clnt->fidpool); 818 819 p9_tag_cleanup(clnt); 820 821 kfree(clnt); 822 } 823 EXPORT_SYMBOL(p9_client_destroy); 824 825 void p9_client_disconnect(struct p9_client *clnt) 826 { 827 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); 828 clnt->status = Disconnected; 829 } 830 EXPORT_SYMBOL(p9_client_disconnect); 831 832 void p9_client_begin_disconnect(struct p9_client *clnt) 833 { 834 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); 835 clnt->status = BeginDisconnect; 836 } 837 EXPORT_SYMBOL(p9_client_begin_disconnect); 838 839 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 840 char *uname, u32 n_uname, char *aname) 841 { 842 int err; 843 struct p9_req_t *req; 844 struct p9_fid *fid; 845 struct p9_qid qid; 846 847 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 848 afid ? afid->fid : -1, uname, aname); 849 err = 0; 850 851 fid = p9_fid_create(clnt); 852 if (IS_ERR(fid)) { 853 err = PTR_ERR(fid); 854 fid = NULL; 855 goto error; 856 } 857 858 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, 859 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 860 if (IS_ERR(req)) { 861 err = PTR_ERR(req); 862 goto error; 863 } 864 865 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 866 if (err) { 867 p9pdu_dump(1, req->rc); 868 p9_free_req(clnt, req); 869 goto error; 870 } 871 872 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 873 qid.type, 874 (unsigned long long)qid.path, 875 qid.version); 876 877 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 878 879 p9_free_req(clnt, req); 880 return fid; 881 882 error: 883 if (fid) 884 p9_fid_destroy(fid); 885 return ERR_PTR(err); 886 } 887 EXPORT_SYMBOL(p9_client_attach); 888 889 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, 890 int clone) 891 { 892 int err; 893 struct p9_client *clnt; 894 struct p9_fid *fid; 895 struct p9_qid *wqids; 896 struct p9_req_t *req; 897 int16_t nwqids, count; 898 899 err = 0; 900 wqids = NULL; 901 clnt = oldfid->clnt; 902 if (clone) { 903 fid = p9_fid_create(clnt); 904 if (IS_ERR(fid)) { 905 err = PTR_ERR(fid); 906 fid = NULL; 907 goto error; 908 } 909 910 fid->uid = oldfid->uid; 911 } else 912 fid = oldfid; 913 914 915 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n", 916 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 917 918 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 919 nwname, wnames); 920 if (IS_ERR(req)) { 921 err = PTR_ERR(req); 922 goto error; 923 } 924 925 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 926 if (err) { 927 p9pdu_dump(1, req->rc); 928 p9_free_req(clnt, req); 929 goto clunk_fid; 930 } 931 p9_free_req(clnt, req); 932 933 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 934 935 if (nwqids != nwname) { 936 err = -ENOENT; 937 goto clunk_fid; 938 } 939 940 for (count = 0; count < nwqids; count++) 941 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 942 count, wqids[count].type, 943 (unsigned long long)wqids[count].path, 944 wqids[count].version); 945 946 if (nwname) 947 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 948 else 949 fid->qid = oldfid->qid; 950 951 kfree(wqids); 952 return fid; 953 954 clunk_fid: 955 kfree(wqids); 956 p9_client_clunk(fid); 957 fid = NULL; 958 959 error: 960 if (fid && (fid != oldfid)) 961 p9_fid_destroy(fid); 962 963 return ERR_PTR(err); 964 } 965 EXPORT_SYMBOL(p9_client_walk); 966 967 int p9_client_open(struct p9_fid *fid, int mode) 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 clnt = fid->clnt; 976 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 977 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 978 err = 0; 979 980 if (fid->mode != -1) 981 return -EINVAL; 982 983 if (p9_is_proto_dotl(clnt)) 984 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 985 else 986 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 987 if (IS_ERR(req)) { 988 err = PTR_ERR(req); 989 goto error; 990 } 991 992 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 993 if (err) { 994 p9pdu_dump(1, req->rc); 995 goto free_and_error; 996 } 997 998 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 999 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1000 (unsigned long long)qid.path, qid.version, iounit); 1001 1002 fid->mode = mode; 1003 fid->iounit = iounit; 1004 1005 free_and_error: 1006 p9_free_req(clnt, req); 1007 error: 1008 return err; 1009 } 1010 EXPORT_SYMBOL(p9_client_open); 1011 1012 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode, 1013 gid_t gid, struct p9_qid *qid) 1014 { 1015 int err = 0; 1016 struct p9_client *clnt; 1017 struct p9_req_t *req; 1018 int iounit; 1019 1020 P9_DPRINTK(P9_DEBUG_9P, 1021 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1022 ofid->fid, name, flags, mode, gid); 1023 clnt = ofid->clnt; 1024 1025 if (ofid->mode != -1) 1026 return -EINVAL; 1027 1028 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags, 1029 mode, gid); 1030 if (IS_ERR(req)) { 1031 err = PTR_ERR(req); 1032 goto error; 1033 } 1034 1035 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1036 if (err) { 1037 p9pdu_dump(1, req->rc); 1038 goto free_and_error; 1039 } 1040 1041 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1042 qid->type, 1043 (unsigned long long)qid->path, 1044 qid->version, iounit); 1045 1046 ofid->mode = mode; 1047 ofid->iounit = iounit; 1048 1049 free_and_error: 1050 p9_free_req(clnt, req); 1051 error: 1052 return err; 1053 } 1054 EXPORT_SYMBOL(p9_client_create_dotl); 1055 1056 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, 1057 char *extension) 1058 { 1059 int err; 1060 struct p9_client *clnt; 1061 struct p9_req_t *req; 1062 struct p9_qid qid; 1063 int iounit; 1064 1065 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1066 fid->fid, name, perm, mode); 1067 err = 0; 1068 clnt = fid->clnt; 1069 1070 if (fid->mode != -1) 1071 return -EINVAL; 1072 1073 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1074 mode, extension); 1075 if (IS_ERR(req)) { 1076 err = PTR_ERR(req); 1077 goto error; 1078 } 1079 1080 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1081 if (err) { 1082 p9pdu_dump(1, req->rc); 1083 goto free_and_error; 1084 } 1085 1086 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1087 qid.type, 1088 (unsigned long long)qid.path, 1089 qid.version, iounit); 1090 1091 fid->mode = mode; 1092 fid->iounit = iounit; 1093 1094 free_and_error: 1095 p9_free_req(clnt, req); 1096 error: 1097 return err; 1098 } 1099 EXPORT_SYMBOL(p9_client_fcreate); 1100 1101 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid, 1102 struct p9_qid *qid) 1103 { 1104 int err = 0; 1105 struct p9_client *clnt; 1106 struct p9_req_t *req; 1107 1108 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1109 dfid->fid, name, symtgt); 1110 clnt = dfid->clnt; 1111 1112 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt, 1113 gid); 1114 if (IS_ERR(req)) { 1115 err = PTR_ERR(req); 1116 goto error; 1117 } 1118 1119 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1120 if (err) { 1121 p9pdu_dump(1, req->rc); 1122 goto free_and_error; 1123 } 1124 1125 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1126 qid->type, (unsigned long long)qid->path, qid->version); 1127 1128 free_and_error: 1129 p9_free_req(clnt, req); 1130 error: 1131 return err; 1132 } 1133 EXPORT_SYMBOL(p9_client_symlink); 1134 1135 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname) 1136 { 1137 struct p9_client *clnt; 1138 struct p9_req_t *req; 1139 1140 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1141 dfid->fid, oldfid->fid, newname); 1142 clnt = dfid->clnt; 1143 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1144 newname); 1145 if (IS_ERR(req)) 1146 return PTR_ERR(req); 1147 1148 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n"); 1149 p9_free_req(clnt, req); 1150 return 0; 1151 } 1152 EXPORT_SYMBOL(p9_client_link); 1153 1154 int p9_client_clunk(struct p9_fid *fid) 1155 { 1156 int err; 1157 struct p9_client *clnt; 1158 struct p9_req_t *req; 1159 1160 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid); 1161 err = 0; 1162 clnt = fid->clnt; 1163 1164 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1165 if (IS_ERR(req)) { 1166 err = PTR_ERR(req); 1167 goto error; 1168 } 1169 1170 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1171 1172 p9_free_req(clnt, req); 1173 p9_fid_destroy(fid); 1174 1175 error: 1176 return err; 1177 } 1178 EXPORT_SYMBOL(p9_client_clunk); 1179 1180 int p9_client_remove(struct p9_fid *fid) 1181 { 1182 int err; 1183 struct p9_client *clnt; 1184 struct p9_req_t *req; 1185 1186 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1187 err = 0; 1188 clnt = fid->clnt; 1189 1190 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1191 if (IS_ERR(req)) { 1192 err = PTR_ERR(req); 1193 goto error; 1194 } 1195 1196 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1197 1198 p9_free_req(clnt, req); 1199 error: 1200 p9_fid_destroy(fid); 1201 return err; 1202 } 1203 EXPORT_SYMBOL(p9_client_remove); 1204 1205 int 1206 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, 1207 u32 count) 1208 { 1209 int err, rsize, total; 1210 struct p9_client *clnt; 1211 struct p9_req_t *req; 1212 char *dataptr; 1213 1214 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid, 1215 (long long unsigned) offset, count); 1216 err = 0; 1217 clnt = fid->clnt; 1218 total = 0; 1219 1220 rsize = fid->iounit; 1221 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1222 rsize = clnt->msize - P9_IOHDRSZ; 1223 1224 if (count < rsize) 1225 rsize = count; 1226 1227 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize); 1228 if (IS_ERR(req)) { 1229 err = PTR_ERR(req); 1230 goto error; 1231 } 1232 1233 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1234 if (err) { 1235 p9pdu_dump(1, req->rc); 1236 goto free_and_error; 1237 } 1238 1239 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1240 1241 if (data) { 1242 memmove(data, dataptr, count); 1243 } 1244 1245 if (udata) { 1246 err = copy_to_user(udata, dataptr, count); 1247 if (err) { 1248 err = -EFAULT; 1249 goto free_and_error; 1250 } 1251 } 1252 1253 p9_free_req(clnt, req); 1254 return count; 1255 1256 free_and_error: 1257 p9_free_req(clnt, req); 1258 error: 1259 return err; 1260 } 1261 EXPORT_SYMBOL(p9_client_read); 1262 1263 int 1264 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, 1265 u64 offset, u32 count) 1266 { 1267 int err, rsize, total; 1268 struct p9_client *clnt; 1269 struct p9_req_t *req; 1270 1271 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", 1272 fid->fid, (long long unsigned) offset, count); 1273 err = 0; 1274 clnt = fid->clnt; 1275 total = 0; 1276 1277 rsize = fid->iounit; 1278 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1279 rsize = clnt->msize - P9_IOHDRSZ; 1280 1281 if (count < rsize) 1282 rsize = count; 1283 if (data) 1284 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset, 1285 rsize, data); 1286 else 1287 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset, 1288 rsize, udata); 1289 if (IS_ERR(req)) { 1290 err = PTR_ERR(req); 1291 goto error; 1292 } 1293 1294 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1295 if (err) { 1296 p9pdu_dump(1, req->rc); 1297 goto free_and_error; 1298 } 1299 1300 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1301 1302 p9_free_req(clnt, req); 1303 return count; 1304 1305 free_and_error: 1306 p9_free_req(clnt, req); 1307 error: 1308 return err; 1309 } 1310 EXPORT_SYMBOL(p9_client_write); 1311 1312 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1313 { 1314 int err; 1315 struct p9_client *clnt; 1316 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1317 struct p9_req_t *req; 1318 u16 ignored; 1319 1320 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1321 1322 if (!ret) 1323 return ERR_PTR(-ENOMEM); 1324 1325 err = 0; 1326 clnt = fid->clnt; 1327 1328 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1329 if (IS_ERR(req)) { 1330 err = PTR_ERR(req); 1331 goto error; 1332 } 1333 1334 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1335 if (err) { 1336 p9pdu_dump(1, req->rc); 1337 p9_free_req(clnt, req); 1338 goto error; 1339 } 1340 1341 P9_DPRINTK(P9_DEBUG_9P, 1342 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1343 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1344 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1345 "<<< uid=%d gid=%d n_muid=%d\n", 1346 ret->size, ret->type, ret->dev, ret->qid.type, 1347 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1348 ret->atime, ret->mtime, (unsigned long long)ret->length, 1349 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1350 ret->n_uid, ret->n_gid, ret->n_muid); 1351 1352 p9_free_req(clnt, req); 1353 return ret; 1354 1355 error: 1356 kfree(ret); 1357 return ERR_PTR(err); 1358 } 1359 EXPORT_SYMBOL(p9_client_stat); 1360 1361 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1362 u64 request_mask) 1363 { 1364 int err; 1365 struct p9_client *clnt; 1366 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1367 GFP_KERNEL); 1368 struct p9_req_t *req; 1369 1370 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1371 fid->fid, request_mask); 1372 1373 if (!ret) 1374 return ERR_PTR(-ENOMEM); 1375 1376 err = 0; 1377 clnt = fid->clnt; 1378 1379 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1380 if (IS_ERR(req)) { 1381 err = PTR_ERR(req); 1382 goto error; 1383 } 1384 1385 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1386 if (err) { 1387 p9pdu_dump(1, req->rc); 1388 p9_free_req(clnt, req); 1389 goto error; 1390 } 1391 1392 P9_DPRINTK(P9_DEBUG_9P, 1393 "<<< RGETATTR st_result_mask=%lld\n" 1394 "<<< qid=%x.%llx.%x\n" 1395 "<<< st_mode=%8.8x st_nlink=%llu\n" 1396 "<<< st_uid=%d st_gid=%d\n" 1397 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1398 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1399 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1400 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1401 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1402 "<<< st_gen=%lld st_data_version=%lld", 1403 ret->st_result_mask, ret->qid.type, ret->qid.path, 1404 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid, 1405 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize, 1406 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1407 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1408 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1409 ret->st_gen, ret->st_data_version); 1410 1411 p9_free_req(clnt, req); 1412 return ret; 1413 1414 error: 1415 kfree(ret); 1416 return ERR_PTR(err); 1417 } 1418 EXPORT_SYMBOL(p9_client_getattr_dotl); 1419 1420 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1421 { 1422 int ret; 1423 1424 /* NOTE: size shouldn't include its own length */ 1425 /* size[2] type[2] dev[4] qid[13] */ 1426 /* mode[4] atime[4] mtime[4] length[8]*/ 1427 /* name[s] uid[s] gid[s] muid[s] */ 1428 ret = 2+4+13+4+4+4+8+2+2+2+2; 1429 1430 if (wst->name) 1431 ret += strlen(wst->name); 1432 if (wst->uid) 1433 ret += strlen(wst->uid); 1434 if (wst->gid) 1435 ret += strlen(wst->gid); 1436 if (wst->muid) 1437 ret += strlen(wst->muid); 1438 1439 if ((proto_version == p9_proto_2000u) || 1440 (proto_version == p9_proto_2000L)) { 1441 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1442 if (wst->extension) 1443 ret += strlen(wst->extension); 1444 } 1445 1446 return ret; 1447 } 1448 1449 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1450 { 1451 int err; 1452 struct p9_req_t *req; 1453 struct p9_client *clnt; 1454 1455 err = 0; 1456 clnt = fid->clnt; 1457 wst->size = p9_client_statsize(wst, clnt->proto_version); 1458 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1459 P9_DPRINTK(P9_DEBUG_9P, 1460 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1461 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1462 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1463 " uid=%d gid=%d n_muid=%d\n", 1464 wst->size, wst->type, wst->dev, wst->qid.type, 1465 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1466 wst->atime, wst->mtime, (unsigned long long)wst->length, 1467 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1468 wst->n_uid, wst->n_gid, wst->n_muid); 1469 1470 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1471 if (IS_ERR(req)) { 1472 err = PTR_ERR(req); 1473 goto error; 1474 } 1475 1476 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1477 1478 p9_free_req(clnt, req); 1479 error: 1480 return err; 1481 } 1482 EXPORT_SYMBOL(p9_client_wstat); 1483 1484 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1485 { 1486 int err; 1487 struct p9_req_t *req; 1488 struct p9_client *clnt; 1489 1490 err = 0; 1491 clnt = fid->clnt; 1492 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1493 P9_DPRINTK(P9_DEBUG_9P, 1494 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1495 " atime_sec=%lld atime_nsec=%lld\n" 1496 " mtime_sec=%lld mtime_nsec=%lld\n", 1497 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid, 1498 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1499 p9attr->mtime_sec, p9attr->mtime_nsec); 1500 1501 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1502 1503 if (IS_ERR(req)) { 1504 err = PTR_ERR(req); 1505 goto error; 1506 } 1507 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1508 p9_free_req(clnt, req); 1509 error: 1510 return err; 1511 } 1512 EXPORT_SYMBOL(p9_client_setattr); 1513 1514 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1515 { 1516 int err; 1517 struct p9_req_t *req; 1518 struct p9_client *clnt; 1519 1520 err = 0; 1521 clnt = fid->clnt; 1522 1523 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1524 1525 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1526 if (IS_ERR(req)) { 1527 err = PTR_ERR(req); 1528 goto error; 1529 } 1530 1531 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1532 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1533 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1534 if (err) { 1535 p9pdu_dump(1, req->rc); 1536 p9_free_req(clnt, req); 1537 goto error; 1538 } 1539 1540 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1541 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1542 "fsid %llu namelen %ld\n", 1543 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1544 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1545 sb->fsid, (long int)sb->namelen); 1546 1547 p9_free_req(clnt, req); 1548 error: 1549 return err; 1550 } 1551 EXPORT_SYMBOL(p9_client_statfs); 1552 1553 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name) 1554 { 1555 int err; 1556 struct p9_req_t *req; 1557 struct p9_client *clnt; 1558 1559 err = 0; 1560 clnt = fid->clnt; 1561 1562 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1563 fid->fid, newdirfid->fid, name); 1564 1565 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1566 newdirfid->fid, name); 1567 if (IS_ERR(req)) { 1568 err = PTR_ERR(req); 1569 goto error; 1570 } 1571 1572 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1573 1574 p9_free_req(clnt, req); 1575 error: 1576 return err; 1577 } 1578 EXPORT_SYMBOL(p9_client_rename); 1579 1580 /* 1581 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1582 */ 1583 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1584 const char *attr_name, u64 *attr_size) 1585 { 1586 int err; 1587 struct p9_req_t *req; 1588 struct p9_client *clnt; 1589 struct p9_fid *attr_fid; 1590 1591 err = 0; 1592 clnt = file_fid->clnt; 1593 attr_fid = p9_fid_create(clnt); 1594 if (IS_ERR(attr_fid)) { 1595 err = PTR_ERR(attr_fid); 1596 attr_fid = NULL; 1597 goto error; 1598 } 1599 P9_DPRINTK(P9_DEBUG_9P, 1600 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 1601 file_fid->fid, attr_fid->fid, attr_name); 1602 1603 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1604 file_fid->fid, attr_fid->fid, attr_name); 1605 if (IS_ERR(req)) { 1606 err = PTR_ERR(req); 1607 goto error; 1608 } 1609 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 1610 if (err) { 1611 p9pdu_dump(1, req->rc); 1612 p9_free_req(clnt, req); 1613 goto clunk_fid; 1614 } 1615 p9_free_req(clnt, req); 1616 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 1617 attr_fid->fid, *attr_size); 1618 return attr_fid; 1619 clunk_fid: 1620 p9_client_clunk(attr_fid); 1621 attr_fid = NULL; 1622 error: 1623 if (attr_fid && (attr_fid != file_fid)) 1624 p9_fid_destroy(attr_fid); 1625 1626 return ERR_PTR(err); 1627 } 1628 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 1629 1630 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 1631 u64 attr_size, int flags) 1632 { 1633 int err; 1634 struct p9_req_t *req; 1635 struct p9_client *clnt; 1636 1637 P9_DPRINTK(P9_DEBUG_9P, 1638 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 1639 fid->fid, name, (long long)attr_size, flags); 1640 err = 0; 1641 clnt = fid->clnt; 1642 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 1643 fid->fid, name, attr_size, flags); 1644 if (IS_ERR(req)) { 1645 err = PTR_ERR(req); 1646 goto error; 1647 } 1648 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 1649 p9_free_req(clnt, req); 1650 error: 1651 return err; 1652 } 1653 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 1654 1655 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 1656 { 1657 int err, rsize, total; 1658 struct p9_client *clnt; 1659 struct p9_req_t *req; 1660 char *dataptr; 1661 1662 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 1663 fid->fid, (long long unsigned) offset, count); 1664 1665 err = 0; 1666 clnt = fid->clnt; 1667 total = 0; 1668 1669 rsize = fid->iounit; 1670 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 1671 rsize = clnt->msize - P9_READDIRHDRSZ; 1672 1673 if (count < rsize) 1674 rsize = count; 1675 1676 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, offset, rsize); 1677 if (IS_ERR(req)) { 1678 err = PTR_ERR(req); 1679 goto error; 1680 } 1681 1682 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1683 if (err) { 1684 p9pdu_dump(1, req->rc); 1685 goto free_and_error; 1686 } 1687 1688 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 1689 1690 if (data) 1691 memmove(data, dataptr, count); 1692 1693 p9_free_req(clnt, req); 1694 return count; 1695 1696 free_and_error: 1697 p9_free_req(clnt, req); 1698 error: 1699 return err; 1700 } 1701 EXPORT_SYMBOL(p9_client_readdir); 1702 1703 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode, 1704 dev_t rdev, gid_t gid, struct p9_qid *qid) 1705 { 1706 int err; 1707 struct p9_client *clnt; 1708 struct p9_req_t *req; 1709 1710 err = 0; 1711 clnt = fid->clnt; 1712 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 1713 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 1714 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode, 1715 MAJOR(rdev), MINOR(rdev), gid); 1716 if (IS_ERR(req)) 1717 return PTR_ERR(req); 1718 1719 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1720 if (err) { 1721 p9pdu_dump(1, req->rc); 1722 goto error; 1723 } 1724 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 1725 (unsigned long long)qid->path, qid->version); 1726 1727 error: 1728 p9_free_req(clnt, req); 1729 return err; 1730 1731 } 1732 EXPORT_SYMBOL(p9_client_mknod_dotl); 1733 1734 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode, 1735 gid_t gid, struct p9_qid *qid) 1736 { 1737 int err; 1738 struct p9_client *clnt; 1739 struct p9_req_t *req; 1740 1741 err = 0; 1742 clnt = fid->clnt; 1743 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 1744 fid->fid, name, mode, gid); 1745 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode, 1746 gid); 1747 if (IS_ERR(req)) 1748 return PTR_ERR(req); 1749 1750 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1751 if (err) { 1752 p9pdu_dump(1, req->rc); 1753 goto error; 1754 } 1755 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 1756 (unsigned long long)qid->path, qid->version); 1757 1758 error: 1759 p9_free_req(clnt, req); 1760 return err; 1761 1762 } 1763 EXPORT_SYMBOL(p9_client_mkdir_dotl); 1764