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 || type == P9_RLERROR) { 454 int ecode; 455 456 if (!p9_is_proto_dotl(c)) { 457 char *ename; 458 459 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 460 &ename, &ecode); 461 if (err) 462 goto out_err; 463 464 if (p9_is_proto_dotu(c)) 465 err = -ecode; 466 467 if (!err || !IS_ERR_VALUE(err)) { 468 err = p9_errstr2errno(ename, strlen(ename)); 469 470 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename); 471 472 kfree(ename); 473 } 474 } else { 475 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 476 err = -ecode; 477 478 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 479 } 480 481 } else 482 err = 0; 483 484 return err; 485 486 out_err: 487 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 488 489 return err; 490 } 491 492 /** 493 * p9_client_flush - flush (cancel) a request 494 * @c: client state 495 * @oldreq: request to cancel 496 * 497 * This sents a flush for a particular requests and links 498 * the flush request to the original request. The current 499 * code only supports a single flush request although the protocol 500 * allows for multiple flush requests to be sent for a single request. 501 * 502 */ 503 504 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 505 { 506 struct p9_req_t *req; 507 int16_t oldtag; 508 int err; 509 510 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 511 if (err) 512 return err; 513 514 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 515 516 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 517 if (IS_ERR(req)) 518 return PTR_ERR(req); 519 520 521 /* if we haven't received a response for oldreq, 522 remove it from the list. */ 523 spin_lock(&c->lock); 524 if (oldreq->status == REQ_STATUS_FLSH) 525 list_del(&oldreq->req_list); 526 spin_unlock(&c->lock); 527 528 p9_free_req(c, req); 529 return 0; 530 } 531 532 /** 533 * p9_client_rpc - issue a request and wait for a response 534 * @c: client session 535 * @type: type of request 536 * @fmt: protocol format string (see protocol.c) 537 * 538 * Returns request structure (which client must free using p9_free_req) 539 */ 540 541 static struct p9_req_t * 542 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 543 { 544 va_list ap; 545 int tag, err; 546 struct p9_req_t *req; 547 unsigned long flags; 548 int sigpending; 549 550 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type); 551 552 /* we allow for any status other than disconnected */ 553 if (c->status == Disconnected) 554 return ERR_PTR(-EIO); 555 556 /* if status is begin_disconnected we allow only clunk request */ 557 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 558 return ERR_PTR(-EIO); 559 560 if (signal_pending(current)) { 561 sigpending = 1; 562 clear_thread_flag(TIF_SIGPENDING); 563 } else 564 sigpending = 0; 565 566 tag = P9_NOTAG; 567 if (type != P9_TVERSION) { 568 tag = p9_idpool_get(c->tagpool); 569 if (tag < 0) 570 return ERR_PTR(-ENOMEM); 571 } 572 573 req = p9_tag_alloc(c, tag); 574 if (IS_ERR(req)) 575 return req; 576 577 /* marshall the data */ 578 p9pdu_prepare(req->tc, tag, type); 579 va_start(ap, fmt); 580 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 581 va_end(ap); 582 if (err) 583 goto reterr; 584 p9pdu_finalize(req->tc); 585 586 err = c->trans_mod->request(c, req); 587 if (err < 0) { 588 if (err != -ERESTARTSYS) 589 c->status = Disconnected; 590 goto reterr; 591 } 592 593 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag); 594 err = wait_event_interruptible(*req->wq, 595 req->status >= REQ_STATUS_RCVD); 596 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n", 597 req->wq, tag, err); 598 599 if (req->status == REQ_STATUS_ERROR) { 600 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 601 err = req->t_err; 602 } 603 604 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 605 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n"); 606 sigpending = 1; 607 clear_thread_flag(TIF_SIGPENDING); 608 609 if (c->trans_mod->cancel(c, req)) 610 p9_client_flush(c, req); 611 612 /* if we received the response anyway, don't signal error */ 613 if (req->status == REQ_STATUS_RCVD) 614 err = 0; 615 } 616 617 if (sigpending) { 618 spin_lock_irqsave(¤t->sighand->siglock, flags); 619 recalc_sigpending(); 620 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 621 } 622 623 if (err < 0) 624 goto reterr; 625 626 err = p9_check_errors(c, req); 627 if (!err) { 628 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type); 629 return req; 630 } 631 632 reterr: 633 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type, 634 err); 635 p9_free_req(c, req); 636 return ERR_PTR(err); 637 } 638 639 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 640 { 641 int ret; 642 struct p9_fid *fid; 643 unsigned long flags; 644 645 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt); 646 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 647 if (!fid) 648 return ERR_PTR(-ENOMEM); 649 650 ret = p9_idpool_get(clnt->fidpool); 651 if (ret < 0) { 652 ret = -ENOSPC; 653 goto error; 654 } 655 fid->fid = ret; 656 657 memset(&fid->qid, 0, sizeof(struct p9_qid)); 658 fid->mode = -1; 659 fid->uid = current_fsuid(); 660 fid->clnt = clnt; 661 fid->rdir = NULL; 662 spin_lock_irqsave(&clnt->lock, flags); 663 list_add(&fid->flist, &clnt->fidlist); 664 spin_unlock_irqrestore(&clnt->lock, flags); 665 666 return fid; 667 668 error: 669 kfree(fid); 670 return ERR_PTR(ret); 671 } 672 673 static void p9_fid_destroy(struct p9_fid *fid) 674 { 675 struct p9_client *clnt; 676 unsigned long flags; 677 678 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid); 679 clnt = fid->clnt; 680 p9_idpool_put(fid->fid, clnt->fidpool); 681 spin_lock_irqsave(&clnt->lock, flags); 682 list_del(&fid->flist); 683 spin_unlock_irqrestore(&clnt->lock, flags); 684 kfree(fid->rdir); 685 kfree(fid); 686 } 687 688 static int p9_client_version(struct p9_client *c) 689 { 690 int err = 0; 691 struct p9_req_t *req; 692 char *version; 693 int msize; 694 695 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 696 c->msize, c->proto_version); 697 698 switch (c->proto_version) { 699 case p9_proto_2000L: 700 req = p9_client_rpc(c, P9_TVERSION, "ds", 701 c->msize, "9P2000.L"); 702 break; 703 case p9_proto_2000u: 704 req = p9_client_rpc(c, P9_TVERSION, "ds", 705 c->msize, "9P2000.u"); 706 break; 707 case p9_proto_legacy: 708 req = p9_client_rpc(c, P9_TVERSION, "ds", 709 c->msize, "9P2000"); 710 break; 711 default: 712 return -EINVAL; 713 break; 714 } 715 716 if (IS_ERR(req)) 717 return PTR_ERR(req); 718 719 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 720 if (err) { 721 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err); 722 p9pdu_dump(1, req->rc); 723 goto error; 724 } 725 726 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 727 if (!strncmp(version, "9P2000.L", 8)) 728 c->proto_version = p9_proto_2000L; 729 else if (!strncmp(version, "9P2000.u", 8)) 730 c->proto_version = p9_proto_2000u; 731 else if (!strncmp(version, "9P2000", 6)) 732 c->proto_version = p9_proto_legacy; 733 else { 734 err = -EREMOTEIO; 735 goto error; 736 } 737 738 if (msize < c->msize) 739 c->msize = msize; 740 741 error: 742 kfree(version); 743 p9_free_req(c, req); 744 745 return err; 746 } 747 748 struct p9_client *p9_client_create(const char *dev_name, char *options) 749 { 750 int err; 751 struct p9_client *clnt; 752 753 err = 0; 754 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 755 if (!clnt) 756 return ERR_PTR(-ENOMEM); 757 758 clnt->trans_mod = NULL; 759 clnt->trans = NULL; 760 spin_lock_init(&clnt->lock); 761 INIT_LIST_HEAD(&clnt->fidlist); 762 763 p9_tag_init(clnt); 764 765 err = parse_opts(options, clnt); 766 if (err < 0) 767 goto free_client; 768 769 if (!clnt->trans_mod) 770 clnt->trans_mod = v9fs_get_default_trans(); 771 772 if (clnt->trans_mod == NULL) { 773 err = -EPROTONOSUPPORT; 774 P9_DPRINTK(P9_DEBUG_ERROR, 775 "No transport defined or default transport\n"); 776 goto free_client; 777 } 778 779 clnt->fidpool = p9_idpool_create(); 780 if (IS_ERR(clnt->fidpool)) { 781 err = PTR_ERR(clnt->fidpool); 782 clnt->fidpool = NULL; 783 goto put_trans; 784 } 785 786 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 787 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 788 789 err = clnt->trans_mod->create(clnt, dev_name, options); 790 if (err) 791 goto destroy_fidpool; 792 793 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) 794 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; 795 796 err = p9_client_version(clnt); 797 if (err) 798 goto close_trans; 799 800 return clnt; 801 802 close_trans: 803 clnt->trans_mod->close(clnt); 804 destroy_fidpool: 805 p9_idpool_destroy(clnt->fidpool); 806 put_trans: 807 v9fs_put_trans(clnt->trans_mod); 808 free_client: 809 kfree(clnt); 810 return ERR_PTR(err); 811 } 812 EXPORT_SYMBOL(p9_client_create); 813 814 void p9_client_destroy(struct p9_client *clnt) 815 { 816 struct p9_fid *fid, *fidptr; 817 818 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt); 819 820 if (clnt->trans_mod) 821 clnt->trans_mod->close(clnt); 822 823 v9fs_put_trans(clnt->trans_mod); 824 825 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { 826 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid); 827 p9_fid_destroy(fid); 828 } 829 830 if (clnt->fidpool) 831 p9_idpool_destroy(clnt->fidpool); 832 833 p9_tag_cleanup(clnt); 834 835 kfree(clnt); 836 } 837 EXPORT_SYMBOL(p9_client_destroy); 838 839 void p9_client_disconnect(struct p9_client *clnt) 840 { 841 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); 842 clnt->status = Disconnected; 843 } 844 EXPORT_SYMBOL(p9_client_disconnect); 845 846 void p9_client_begin_disconnect(struct p9_client *clnt) 847 { 848 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); 849 clnt->status = BeginDisconnect; 850 } 851 EXPORT_SYMBOL(p9_client_begin_disconnect); 852 853 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 854 char *uname, u32 n_uname, char *aname) 855 { 856 int err; 857 struct p9_req_t *req; 858 struct p9_fid *fid; 859 struct p9_qid qid; 860 861 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 862 afid ? afid->fid : -1, uname, aname); 863 err = 0; 864 865 fid = p9_fid_create(clnt); 866 if (IS_ERR(fid)) { 867 err = PTR_ERR(fid); 868 fid = NULL; 869 goto error; 870 } 871 872 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, 873 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 874 if (IS_ERR(req)) { 875 err = PTR_ERR(req); 876 goto error; 877 } 878 879 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 880 if (err) { 881 p9pdu_dump(1, req->rc); 882 p9_free_req(clnt, req); 883 goto error; 884 } 885 886 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 887 qid.type, 888 (unsigned long long)qid.path, 889 qid.version); 890 891 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 892 893 p9_free_req(clnt, req); 894 return fid; 895 896 error: 897 if (fid) 898 p9_fid_destroy(fid); 899 return ERR_PTR(err); 900 } 901 EXPORT_SYMBOL(p9_client_attach); 902 903 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, 904 int clone) 905 { 906 int err; 907 struct p9_client *clnt; 908 struct p9_fid *fid; 909 struct p9_qid *wqids; 910 struct p9_req_t *req; 911 int16_t nwqids, count; 912 913 err = 0; 914 wqids = NULL; 915 clnt = oldfid->clnt; 916 if (clone) { 917 fid = p9_fid_create(clnt); 918 if (IS_ERR(fid)) { 919 err = PTR_ERR(fid); 920 fid = NULL; 921 goto error; 922 } 923 924 fid->uid = oldfid->uid; 925 } else 926 fid = oldfid; 927 928 929 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n", 930 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 931 932 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 933 nwname, wnames); 934 if (IS_ERR(req)) { 935 err = PTR_ERR(req); 936 goto error; 937 } 938 939 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 940 if (err) { 941 p9pdu_dump(1, req->rc); 942 p9_free_req(clnt, req); 943 goto clunk_fid; 944 } 945 p9_free_req(clnt, req); 946 947 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 948 949 if (nwqids != nwname) { 950 err = -ENOENT; 951 goto clunk_fid; 952 } 953 954 for (count = 0; count < nwqids; count++) 955 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 956 count, wqids[count].type, 957 (unsigned long long)wqids[count].path, 958 wqids[count].version); 959 960 if (nwname) 961 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 962 else 963 fid->qid = oldfid->qid; 964 965 kfree(wqids); 966 return fid; 967 968 clunk_fid: 969 kfree(wqids); 970 p9_client_clunk(fid); 971 fid = NULL; 972 973 error: 974 if (fid && (fid != oldfid)) 975 p9_fid_destroy(fid); 976 977 return ERR_PTR(err); 978 } 979 EXPORT_SYMBOL(p9_client_walk); 980 981 int p9_client_open(struct p9_fid *fid, int mode) 982 { 983 int err; 984 struct p9_client *clnt; 985 struct p9_req_t *req; 986 struct p9_qid qid; 987 int iounit; 988 989 clnt = fid->clnt; 990 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 991 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 992 err = 0; 993 994 if (fid->mode != -1) 995 return -EINVAL; 996 997 if (p9_is_proto_dotl(clnt)) 998 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 999 else 1000 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1001 if (IS_ERR(req)) { 1002 err = PTR_ERR(req); 1003 goto error; 1004 } 1005 1006 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1007 if (err) { 1008 p9pdu_dump(1, req->rc); 1009 goto free_and_error; 1010 } 1011 1012 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1013 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1014 (unsigned long long)qid.path, qid.version, iounit); 1015 1016 fid->mode = mode; 1017 fid->iounit = iounit; 1018 1019 free_and_error: 1020 p9_free_req(clnt, req); 1021 error: 1022 return err; 1023 } 1024 EXPORT_SYMBOL(p9_client_open); 1025 1026 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode, 1027 gid_t gid, struct p9_qid *qid) 1028 { 1029 int err = 0; 1030 struct p9_client *clnt; 1031 struct p9_req_t *req; 1032 int iounit; 1033 1034 P9_DPRINTK(P9_DEBUG_9P, 1035 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1036 ofid->fid, name, flags, mode, gid); 1037 clnt = ofid->clnt; 1038 1039 if (ofid->mode != -1) 1040 return -EINVAL; 1041 1042 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags, 1043 mode, gid); 1044 if (IS_ERR(req)) { 1045 err = PTR_ERR(req); 1046 goto error; 1047 } 1048 1049 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1050 if (err) { 1051 p9pdu_dump(1, req->rc); 1052 goto free_and_error; 1053 } 1054 1055 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1056 qid->type, 1057 (unsigned long long)qid->path, 1058 qid->version, iounit); 1059 1060 ofid->mode = mode; 1061 ofid->iounit = iounit; 1062 1063 free_and_error: 1064 p9_free_req(clnt, req); 1065 error: 1066 return err; 1067 } 1068 EXPORT_SYMBOL(p9_client_create_dotl); 1069 1070 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, 1071 char *extension) 1072 { 1073 int err; 1074 struct p9_client *clnt; 1075 struct p9_req_t *req; 1076 struct p9_qid qid; 1077 int iounit; 1078 1079 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1080 fid->fid, name, perm, mode); 1081 err = 0; 1082 clnt = fid->clnt; 1083 1084 if (fid->mode != -1) 1085 return -EINVAL; 1086 1087 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1088 mode, extension); 1089 if (IS_ERR(req)) { 1090 err = PTR_ERR(req); 1091 goto error; 1092 } 1093 1094 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1095 if (err) { 1096 p9pdu_dump(1, req->rc); 1097 goto free_and_error; 1098 } 1099 1100 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1101 qid.type, 1102 (unsigned long long)qid.path, 1103 qid.version, iounit); 1104 1105 fid->mode = mode; 1106 fid->iounit = iounit; 1107 1108 free_and_error: 1109 p9_free_req(clnt, req); 1110 error: 1111 return err; 1112 } 1113 EXPORT_SYMBOL(p9_client_fcreate); 1114 1115 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid, 1116 struct p9_qid *qid) 1117 { 1118 int err = 0; 1119 struct p9_client *clnt; 1120 struct p9_req_t *req; 1121 1122 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1123 dfid->fid, name, symtgt); 1124 clnt = dfid->clnt; 1125 1126 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt, 1127 gid); 1128 if (IS_ERR(req)) { 1129 err = PTR_ERR(req); 1130 goto error; 1131 } 1132 1133 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1134 if (err) { 1135 p9pdu_dump(1, req->rc); 1136 goto free_and_error; 1137 } 1138 1139 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1140 qid->type, (unsigned long long)qid->path, qid->version); 1141 1142 free_and_error: 1143 p9_free_req(clnt, req); 1144 error: 1145 return err; 1146 } 1147 EXPORT_SYMBOL(p9_client_symlink); 1148 1149 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname) 1150 { 1151 struct p9_client *clnt; 1152 struct p9_req_t *req; 1153 1154 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1155 dfid->fid, oldfid->fid, newname); 1156 clnt = dfid->clnt; 1157 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1158 newname); 1159 if (IS_ERR(req)) 1160 return PTR_ERR(req); 1161 1162 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n"); 1163 p9_free_req(clnt, req); 1164 return 0; 1165 } 1166 EXPORT_SYMBOL(p9_client_link); 1167 1168 int p9_client_fsync(struct p9_fid *fid, int datasync) 1169 { 1170 int err; 1171 struct p9_client *clnt; 1172 struct p9_req_t *req; 1173 1174 P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1175 fid->fid, datasync); 1176 err = 0; 1177 clnt = fid->clnt; 1178 1179 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1180 if (IS_ERR(req)) { 1181 err = PTR_ERR(req); 1182 goto error; 1183 } 1184 1185 P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1186 1187 p9_free_req(clnt, req); 1188 1189 error: 1190 return err; 1191 } 1192 EXPORT_SYMBOL(p9_client_fsync); 1193 1194 int p9_client_clunk(struct p9_fid *fid) 1195 { 1196 int err; 1197 struct p9_client *clnt; 1198 struct p9_req_t *req; 1199 1200 if (!fid) { 1201 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n"); 1202 dump_stack(); 1203 return 0; 1204 } 1205 1206 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid); 1207 err = 0; 1208 clnt = fid->clnt; 1209 1210 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1211 if (IS_ERR(req)) { 1212 err = PTR_ERR(req); 1213 goto error; 1214 } 1215 1216 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1217 1218 p9_free_req(clnt, req); 1219 p9_fid_destroy(fid); 1220 1221 error: 1222 return err; 1223 } 1224 EXPORT_SYMBOL(p9_client_clunk); 1225 1226 int p9_client_remove(struct p9_fid *fid) 1227 { 1228 int err; 1229 struct p9_client *clnt; 1230 struct p9_req_t *req; 1231 1232 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1233 err = 0; 1234 clnt = fid->clnt; 1235 1236 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1237 if (IS_ERR(req)) { 1238 err = PTR_ERR(req); 1239 goto error; 1240 } 1241 1242 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1243 1244 p9_free_req(clnt, req); 1245 error: 1246 p9_fid_destroy(fid); 1247 return err; 1248 } 1249 EXPORT_SYMBOL(p9_client_remove); 1250 1251 int 1252 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, 1253 u32 count) 1254 { 1255 int err, rsize, total; 1256 struct p9_client *clnt; 1257 struct p9_req_t *req; 1258 char *dataptr; 1259 1260 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid, 1261 (long long unsigned) offset, count); 1262 err = 0; 1263 clnt = fid->clnt; 1264 total = 0; 1265 1266 rsize = fid->iounit; 1267 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1268 rsize = clnt->msize - P9_IOHDRSZ; 1269 1270 if (count < rsize) 1271 rsize = count; 1272 1273 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize); 1274 if (IS_ERR(req)) { 1275 err = PTR_ERR(req); 1276 goto error; 1277 } 1278 1279 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1280 if (err) { 1281 p9pdu_dump(1, req->rc); 1282 goto free_and_error; 1283 } 1284 1285 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1286 1287 if (data) { 1288 memmove(data, dataptr, count); 1289 } else { 1290 err = copy_to_user(udata, dataptr, count); 1291 if (err) { 1292 err = -EFAULT; 1293 goto free_and_error; 1294 } 1295 } 1296 p9_free_req(clnt, req); 1297 return count; 1298 1299 free_and_error: 1300 p9_free_req(clnt, req); 1301 error: 1302 return err; 1303 } 1304 EXPORT_SYMBOL(p9_client_read); 1305 1306 int 1307 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, 1308 u64 offset, u32 count) 1309 { 1310 int err, rsize, total; 1311 struct p9_client *clnt; 1312 struct p9_req_t *req; 1313 1314 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", 1315 fid->fid, (long long unsigned) offset, count); 1316 err = 0; 1317 clnt = fid->clnt; 1318 total = 0; 1319 1320 rsize = fid->iounit; 1321 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1322 rsize = clnt->msize - P9_IOHDRSZ; 1323 1324 if (count < rsize) 1325 rsize = count; 1326 if (data) 1327 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset, 1328 rsize, data); 1329 else 1330 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset, 1331 rsize, udata); 1332 if (IS_ERR(req)) { 1333 err = PTR_ERR(req); 1334 goto error; 1335 } 1336 1337 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1338 if (err) { 1339 p9pdu_dump(1, req->rc); 1340 goto free_and_error; 1341 } 1342 1343 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1344 1345 p9_free_req(clnt, req); 1346 return count; 1347 1348 free_and_error: 1349 p9_free_req(clnt, req); 1350 error: 1351 return err; 1352 } 1353 EXPORT_SYMBOL(p9_client_write); 1354 1355 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1356 { 1357 int err; 1358 struct p9_client *clnt; 1359 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1360 struct p9_req_t *req; 1361 u16 ignored; 1362 1363 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1364 1365 if (!ret) 1366 return ERR_PTR(-ENOMEM); 1367 1368 err = 0; 1369 clnt = fid->clnt; 1370 1371 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1372 if (IS_ERR(req)) { 1373 err = PTR_ERR(req); 1374 goto error; 1375 } 1376 1377 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1378 if (err) { 1379 p9pdu_dump(1, req->rc); 1380 p9_free_req(clnt, req); 1381 goto error; 1382 } 1383 1384 P9_DPRINTK(P9_DEBUG_9P, 1385 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1386 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1387 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1388 "<<< uid=%d gid=%d n_muid=%d\n", 1389 ret->size, ret->type, ret->dev, ret->qid.type, 1390 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1391 ret->atime, ret->mtime, (unsigned long long)ret->length, 1392 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1393 ret->n_uid, ret->n_gid, ret->n_muid); 1394 1395 p9_free_req(clnt, req); 1396 return ret; 1397 1398 error: 1399 kfree(ret); 1400 return ERR_PTR(err); 1401 } 1402 EXPORT_SYMBOL(p9_client_stat); 1403 1404 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1405 u64 request_mask) 1406 { 1407 int err; 1408 struct p9_client *clnt; 1409 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1410 GFP_KERNEL); 1411 struct p9_req_t *req; 1412 1413 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1414 fid->fid, request_mask); 1415 1416 if (!ret) 1417 return ERR_PTR(-ENOMEM); 1418 1419 err = 0; 1420 clnt = fid->clnt; 1421 1422 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1423 if (IS_ERR(req)) { 1424 err = PTR_ERR(req); 1425 goto error; 1426 } 1427 1428 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1429 if (err) { 1430 p9pdu_dump(1, req->rc); 1431 p9_free_req(clnt, req); 1432 goto error; 1433 } 1434 1435 P9_DPRINTK(P9_DEBUG_9P, 1436 "<<< RGETATTR st_result_mask=%lld\n" 1437 "<<< qid=%x.%llx.%x\n" 1438 "<<< st_mode=%8.8x st_nlink=%llu\n" 1439 "<<< st_uid=%d st_gid=%d\n" 1440 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1441 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1442 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1443 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1444 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1445 "<<< st_gen=%lld st_data_version=%lld", 1446 ret->st_result_mask, ret->qid.type, ret->qid.path, 1447 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid, 1448 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize, 1449 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1450 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1451 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1452 ret->st_gen, ret->st_data_version); 1453 1454 p9_free_req(clnt, req); 1455 return ret; 1456 1457 error: 1458 kfree(ret); 1459 return ERR_PTR(err); 1460 } 1461 EXPORT_SYMBOL(p9_client_getattr_dotl); 1462 1463 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1464 { 1465 int ret; 1466 1467 /* NOTE: size shouldn't include its own length */ 1468 /* size[2] type[2] dev[4] qid[13] */ 1469 /* mode[4] atime[4] mtime[4] length[8]*/ 1470 /* name[s] uid[s] gid[s] muid[s] */ 1471 ret = 2+4+13+4+4+4+8+2+2+2+2; 1472 1473 if (wst->name) 1474 ret += strlen(wst->name); 1475 if (wst->uid) 1476 ret += strlen(wst->uid); 1477 if (wst->gid) 1478 ret += strlen(wst->gid); 1479 if (wst->muid) 1480 ret += strlen(wst->muid); 1481 1482 if ((proto_version == p9_proto_2000u) || 1483 (proto_version == p9_proto_2000L)) { 1484 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1485 if (wst->extension) 1486 ret += strlen(wst->extension); 1487 } 1488 1489 return ret; 1490 } 1491 1492 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1493 { 1494 int err; 1495 struct p9_req_t *req; 1496 struct p9_client *clnt; 1497 1498 err = 0; 1499 clnt = fid->clnt; 1500 wst->size = p9_client_statsize(wst, clnt->proto_version); 1501 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1502 P9_DPRINTK(P9_DEBUG_9P, 1503 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1504 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1505 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1506 " uid=%d gid=%d n_muid=%d\n", 1507 wst->size, wst->type, wst->dev, wst->qid.type, 1508 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1509 wst->atime, wst->mtime, (unsigned long long)wst->length, 1510 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1511 wst->n_uid, wst->n_gid, wst->n_muid); 1512 1513 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1514 if (IS_ERR(req)) { 1515 err = PTR_ERR(req); 1516 goto error; 1517 } 1518 1519 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1520 1521 p9_free_req(clnt, req); 1522 error: 1523 return err; 1524 } 1525 EXPORT_SYMBOL(p9_client_wstat); 1526 1527 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1528 { 1529 int err; 1530 struct p9_req_t *req; 1531 struct p9_client *clnt; 1532 1533 err = 0; 1534 clnt = fid->clnt; 1535 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1536 P9_DPRINTK(P9_DEBUG_9P, 1537 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1538 " atime_sec=%lld atime_nsec=%lld\n" 1539 " mtime_sec=%lld mtime_nsec=%lld\n", 1540 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid, 1541 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1542 p9attr->mtime_sec, p9attr->mtime_nsec); 1543 1544 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1545 1546 if (IS_ERR(req)) { 1547 err = PTR_ERR(req); 1548 goto error; 1549 } 1550 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1551 p9_free_req(clnt, req); 1552 error: 1553 return err; 1554 } 1555 EXPORT_SYMBOL(p9_client_setattr); 1556 1557 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1558 { 1559 int err; 1560 struct p9_req_t *req; 1561 struct p9_client *clnt; 1562 1563 err = 0; 1564 clnt = fid->clnt; 1565 1566 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1567 1568 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1569 if (IS_ERR(req)) { 1570 err = PTR_ERR(req); 1571 goto error; 1572 } 1573 1574 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1575 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1576 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1577 if (err) { 1578 p9pdu_dump(1, req->rc); 1579 p9_free_req(clnt, req); 1580 goto error; 1581 } 1582 1583 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1584 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1585 "fsid %llu namelen %ld\n", 1586 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1587 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1588 sb->fsid, (long int)sb->namelen); 1589 1590 p9_free_req(clnt, req); 1591 error: 1592 return err; 1593 } 1594 EXPORT_SYMBOL(p9_client_statfs); 1595 1596 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name) 1597 { 1598 int err; 1599 struct p9_req_t *req; 1600 struct p9_client *clnt; 1601 1602 err = 0; 1603 clnt = fid->clnt; 1604 1605 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1606 fid->fid, newdirfid->fid, name); 1607 1608 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1609 newdirfid->fid, name); 1610 if (IS_ERR(req)) { 1611 err = PTR_ERR(req); 1612 goto error; 1613 } 1614 1615 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1616 1617 p9_free_req(clnt, req); 1618 error: 1619 return err; 1620 } 1621 EXPORT_SYMBOL(p9_client_rename); 1622 1623 /* 1624 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1625 */ 1626 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1627 const char *attr_name, u64 *attr_size) 1628 { 1629 int err; 1630 struct p9_req_t *req; 1631 struct p9_client *clnt; 1632 struct p9_fid *attr_fid; 1633 1634 err = 0; 1635 clnt = file_fid->clnt; 1636 attr_fid = p9_fid_create(clnt); 1637 if (IS_ERR(attr_fid)) { 1638 err = PTR_ERR(attr_fid); 1639 attr_fid = NULL; 1640 goto error; 1641 } 1642 P9_DPRINTK(P9_DEBUG_9P, 1643 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 1644 file_fid->fid, attr_fid->fid, attr_name); 1645 1646 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1647 file_fid->fid, attr_fid->fid, attr_name); 1648 if (IS_ERR(req)) { 1649 err = PTR_ERR(req); 1650 goto error; 1651 } 1652 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 1653 if (err) { 1654 p9pdu_dump(1, req->rc); 1655 p9_free_req(clnt, req); 1656 goto clunk_fid; 1657 } 1658 p9_free_req(clnt, req); 1659 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 1660 attr_fid->fid, *attr_size); 1661 return attr_fid; 1662 clunk_fid: 1663 p9_client_clunk(attr_fid); 1664 attr_fid = NULL; 1665 error: 1666 if (attr_fid && (attr_fid != file_fid)) 1667 p9_fid_destroy(attr_fid); 1668 1669 return ERR_PTR(err); 1670 } 1671 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 1672 1673 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 1674 u64 attr_size, int flags) 1675 { 1676 int err; 1677 struct p9_req_t *req; 1678 struct p9_client *clnt; 1679 1680 P9_DPRINTK(P9_DEBUG_9P, 1681 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 1682 fid->fid, name, (long long)attr_size, flags); 1683 err = 0; 1684 clnt = fid->clnt; 1685 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 1686 fid->fid, name, attr_size, flags); 1687 if (IS_ERR(req)) { 1688 err = PTR_ERR(req); 1689 goto error; 1690 } 1691 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 1692 p9_free_req(clnt, req); 1693 error: 1694 return err; 1695 } 1696 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 1697 1698 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 1699 { 1700 int err, rsize, total; 1701 struct p9_client *clnt; 1702 struct p9_req_t *req; 1703 char *dataptr; 1704 1705 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 1706 fid->fid, (long long unsigned) offset, count); 1707 1708 err = 0; 1709 clnt = fid->clnt; 1710 total = 0; 1711 1712 rsize = fid->iounit; 1713 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 1714 rsize = clnt->msize - P9_READDIRHDRSZ; 1715 1716 if (count < rsize) 1717 rsize = count; 1718 1719 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, offset, rsize); 1720 if (IS_ERR(req)) { 1721 err = PTR_ERR(req); 1722 goto error; 1723 } 1724 1725 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1726 if (err) { 1727 p9pdu_dump(1, req->rc); 1728 goto free_and_error; 1729 } 1730 1731 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 1732 1733 if (data) 1734 memmove(data, dataptr, count); 1735 1736 p9_free_req(clnt, req); 1737 return count; 1738 1739 free_and_error: 1740 p9_free_req(clnt, req); 1741 error: 1742 return err; 1743 } 1744 EXPORT_SYMBOL(p9_client_readdir); 1745 1746 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode, 1747 dev_t rdev, gid_t gid, struct p9_qid *qid) 1748 { 1749 int err; 1750 struct p9_client *clnt; 1751 struct p9_req_t *req; 1752 1753 err = 0; 1754 clnt = fid->clnt; 1755 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 1756 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 1757 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode, 1758 MAJOR(rdev), MINOR(rdev), gid); 1759 if (IS_ERR(req)) 1760 return PTR_ERR(req); 1761 1762 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1763 if (err) { 1764 p9pdu_dump(1, req->rc); 1765 goto error; 1766 } 1767 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 1768 (unsigned long long)qid->path, qid->version); 1769 1770 error: 1771 p9_free_req(clnt, req); 1772 return err; 1773 1774 } 1775 EXPORT_SYMBOL(p9_client_mknod_dotl); 1776 1777 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode, 1778 gid_t gid, struct p9_qid *qid) 1779 { 1780 int err; 1781 struct p9_client *clnt; 1782 struct p9_req_t *req; 1783 1784 err = 0; 1785 clnt = fid->clnt; 1786 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 1787 fid->fid, name, mode, gid); 1788 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode, 1789 gid); 1790 if (IS_ERR(req)) 1791 return PTR_ERR(req); 1792 1793 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1794 if (err) { 1795 p9pdu_dump(1, req->rc); 1796 goto error; 1797 } 1798 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 1799 (unsigned long long)qid->path, qid->version); 1800 1801 error: 1802 p9_free_req(clnt, req); 1803 return err; 1804 1805 } 1806 EXPORT_SYMBOL(p9_client_mkdir_dotl); 1807 1808 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 1809 { 1810 int err; 1811 struct p9_client *clnt; 1812 struct p9_req_t *req; 1813 1814 err = 0; 1815 clnt = fid->clnt; 1816 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 1817 "start %lld length %lld proc_id %d client_id %s\n", 1818 fid->fid, flock->type, flock->flags, flock->start, 1819 flock->length, flock->proc_id, flock->client_id); 1820 1821 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 1822 flock->flags, flock->start, flock->length, 1823 flock->proc_id, flock->client_id); 1824 1825 if (IS_ERR(req)) 1826 return PTR_ERR(req); 1827 1828 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); 1829 if (err) { 1830 p9pdu_dump(1, req->rc); 1831 goto error; 1832 } 1833 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 1834 error: 1835 p9_free_req(clnt, req); 1836 return err; 1837 1838 } 1839 EXPORT_SYMBOL(p9_client_lock_dotl); 1840 1841 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 1842 { 1843 int err; 1844 struct p9_client *clnt; 1845 struct p9_req_t *req; 1846 1847 err = 0; 1848 clnt = fid->clnt; 1849 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 1850 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 1851 glock->start, glock->length, glock->proc_id, glock->client_id); 1852 1853 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 1854 glock->start, glock->length, glock->proc_id, glock->client_id); 1855 1856 if (IS_ERR(req)) 1857 return PTR_ERR(req); 1858 1859 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, 1860 &glock->start, &glock->length, &glock->proc_id, 1861 &glock->client_id); 1862 if (err) { 1863 p9pdu_dump(1, req->rc); 1864 goto error; 1865 } 1866 P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 1867 "proc_id %d client_id %s\n", glock->type, glock->start, 1868 glock->length, glock->proc_id, glock->client_id); 1869 error: 1870 p9_free_req(clnt, req); 1871 return err; 1872 } 1873 EXPORT_SYMBOL(p9_client_getlock_dotl); 1874 1875 int p9_client_readlink(struct p9_fid *fid, char **target) 1876 { 1877 int err; 1878 struct p9_client *clnt; 1879 struct p9_req_t *req; 1880 1881 err = 0; 1882 clnt = fid->clnt; 1883 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 1884 1885 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 1886 if (IS_ERR(req)) 1887 return PTR_ERR(req); 1888 1889 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); 1890 if (err) { 1891 p9pdu_dump(1, req->rc); 1892 goto error; 1893 } 1894 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 1895 error: 1896 p9_free_req(clnt, req); 1897 return err; 1898 } 1899 EXPORT_SYMBOL(p9_client_readlink); 1900