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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 27 28 #include <linux/module.h> 29 #include <linux/errno.h> 30 #include <linux/fs.h> 31 #include <linux/poll.h> 32 #include <linux/idr.h> 33 #include <linux/mutex.h> 34 #include <linux/slab.h> 35 #include <linux/sched.h> 36 #include <linux/uaccess.h> 37 #include <net/9p/9p.h> 38 #include <linux/parser.h> 39 #include <net/9p/client.h> 40 #include <net/9p/transport.h> 41 #include "protocol.h" 42 43 #define CREATE_TRACE_POINTS 44 #include <trace/events/9p.h> 45 46 /* 47 * Client Option Parsing (code inspired by NFS code) 48 * - a little lazy - parse all client options 49 */ 50 51 enum { 52 Opt_msize, 53 Opt_trans, 54 Opt_legacy, 55 Opt_version, 56 Opt_err, 57 }; 58 59 static const match_table_t tokens = { 60 {Opt_msize, "msize=%u"}, 61 {Opt_legacy, "noextend"}, 62 {Opt_trans, "trans=%s"}, 63 {Opt_version, "version=%s"}, 64 {Opt_err, NULL}, 65 }; 66 67 inline int p9_is_proto_dotl(struct p9_client *clnt) 68 { 69 return clnt->proto_version == p9_proto_2000L; 70 } 71 EXPORT_SYMBOL(p9_is_proto_dotl); 72 73 inline int p9_is_proto_dotu(struct p9_client *clnt) 74 { 75 return clnt->proto_version == p9_proto_2000u; 76 } 77 EXPORT_SYMBOL(p9_is_proto_dotu); 78 79 /* Interpret mount option for protocol version */ 80 static int get_protocol_version(char *s) 81 { 82 int version = -EINVAL; 83 84 if (!strcmp(s, "9p2000")) { 85 version = p9_proto_legacy; 86 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 87 } else if (!strcmp(s, "9p2000.u")) { 88 version = p9_proto_2000u; 89 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 90 } else if (!strcmp(s, "9p2000.L")) { 91 version = p9_proto_2000L; 92 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 93 } else 94 pr_info("Unknown protocol version %s\n", s); 95 96 return version; 97 } 98 99 /** 100 * parse_options - parse mount options into client structure 101 * @opts: options string passed from mount 102 * @clnt: existing v9fs client information 103 * 104 * Return 0 upon success, -ERRNO upon failure 105 */ 106 107 static int parse_opts(char *opts, struct p9_client *clnt) 108 { 109 char *options, *tmp_options; 110 char *p; 111 substring_t args[MAX_OPT_ARGS]; 112 int option; 113 char *s; 114 int ret = 0; 115 116 clnt->proto_version = p9_proto_2000u; 117 clnt->msize = 8192; 118 119 if (!opts) 120 return 0; 121 122 tmp_options = kstrdup(opts, GFP_KERNEL); 123 if (!tmp_options) { 124 p9_debug(P9_DEBUG_ERROR, 125 "failed to allocate copy of option string\n"); 126 return -ENOMEM; 127 } 128 options = tmp_options; 129 130 while ((p = strsep(&options, ",")) != NULL) { 131 int token, r; 132 if (!*p) 133 continue; 134 token = match_token(p, tokens, args); 135 switch (token) { 136 case Opt_msize: 137 r = match_int(&args[0], &option); 138 if (r < 0) { 139 p9_debug(P9_DEBUG_ERROR, 140 "integer field, but no integer?\n"); 141 ret = r; 142 continue; 143 } 144 clnt->msize = option; 145 break; 146 case Opt_trans: 147 s = match_strdup(&args[0]); 148 if (!s) { 149 ret = -ENOMEM; 150 p9_debug(P9_DEBUG_ERROR, 151 "problem allocating copy of trans arg\n"); 152 goto free_and_return; 153 } 154 clnt->trans_mod = v9fs_get_trans_by_name(s); 155 if (clnt->trans_mod == NULL) { 156 pr_info("Could not find request transport: %s\n", 157 s); 158 ret = -EINVAL; 159 kfree(s); 160 goto free_and_return; 161 } 162 kfree(s); 163 break; 164 case Opt_legacy: 165 clnt->proto_version = p9_proto_legacy; 166 break; 167 case Opt_version: 168 s = match_strdup(&args[0]); 169 if (!s) { 170 ret = -ENOMEM; 171 p9_debug(P9_DEBUG_ERROR, 172 "problem allocating copy of version arg\n"); 173 goto free_and_return; 174 } 175 ret = get_protocol_version(s); 176 if (ret == -EINVAL) { 177 kfree(s); 178 goto free_and_return; 179 } 180 kfree(s); 181 clnt->proto_version = ret; 182 break; 183 default: 184 continue; 185 } 186 } 187 188 free_and_return: 189 kfree(tmp_options); 190 return ret; 191 } 192 193 /** 194 * p9_tag_alloc - lookup/allocate a request by tag 195 * @c: client session to lookup tag within 196 * @tag: numeric id for transaction 197 * 198 * this is a simple array lookup, but will grow the 199 * request_slots as necessary to accommodate transaction 200 * ids which did not previously have a slot. 201 * 202 * this code relies on the client spinlock to manage locks, its 203 * possible we should switch to something else, but I'd rather 204 * stick with something low-overhead for the common case. 205 * 206 */ 207 208 static struct p9_req_t * 209 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size) 210 { 211 unsigned long flags; 212 int row, col; 213 struct p9_req_t *req; 214 int alloc_msize = min(c->msize, max_size); 215 216 /* This looks up the original request by tag so we know which 217 * buffer to read the data into */ 218 tag++; 219 220 if (tag >= c->max_tag) { 221 spin_lock_irqsave(&c->lock, flags); 222 /* check again since original check was outside of lock */ 223 while (tag >= c->max_tag) { 224 row = (tag / P9_ROW_MAXTAG); 225 c->reqs[row] = kcalloc(P9_ROW_MAXTAG, 226 sizeof(struct p9_req_t), GFP_ATOMIC); 227 228 if (!c->reqs[row]) { 229 pr_err("Couldn't grow tag array\n"); 230 spin_unlock_irqrestore(&c->lock, flags); 231 return ERR_PTR(-ENOMEM); 232 } 233 for (col = 0; col < P9_ROW_MAXTAG; col++) { 234 c->reqs[row][col].status = REQ_STATUS_IDLE; 235 c->reqs[row][col].tc = NULL; 236 } 237 c->max_tag += P9_ROW_MAXTAG; 238 } 239 spin_unlock_irqrestore(&c->lock, flags); 240 } 241 row = tag / P9_ROW_MAXTAG; 242 col = tag % P9_ROW_MAXTAG; 243 244 req = &c->reqs[row][col]; 245 if (!req->tc) { 246 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS); 247 if (!req->wq) { 248 pr_err("Couldn't grow tag array\n"); 249 return ERR_PTR(-ENOMEM); 250 } 251 init_waitqueue_head(req->wq); 252 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, 253 GFP_NOFS); 254 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, 255 GFP_NOFS); 256 if ((!req->tc) || (!req->rc)) { 257 pr_err("Couldn't grow tag array\n"); 258 kfree(req->tc); 259 kfree(req->rc); 260 kfree(req->wq); 261 req->tc = req->rc = NULL; 262 req->wq = NULL; 263 return ERR_PTR(-ENOMEM); 264 } 265 req->tc->capacity = alloc_msize; 266 req->rc->capacity = alloc_msize; 267 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall); 268 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall); 269 } 270 271 p9pdu_reset(req->tc); 272 p9pdu_reset(req->rc); 273 274 req->tc->tag = tag-1; 275 req->status = REQ_STATUS_ALLOC; 276 277 return &c->reqs[row][col]; 278 } 279 280 /** 281 * p9_tag_lookup - lookup a request by tag 282 * @c: client session to lookup tag within 283 * @tag: numeric id for transaction 284 * 285 */ 286 287 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 288 { 289 int row, col; 290 291 /* This looks up the original request by tag so we know which 292 * buffer to read the data into */ 293 tag++; 294 295 if(tag >= c->max_tag) 296 return NULL; 297 298 row = tag / P9_ROW_MAXTAG; 299 col = tag % P9_ROW_MAXTAG; 300 301 return &c->reqs[row][col]; 302 } 303 EXPORT_SYMBOL(p9_tag_lookup); 304 305 /** 306 * p9_tag_init - setup tags structure and contents 307 * @c: v9fs client struct 308 * 309 * This initializes the tags structure for each client instance. 310 * 311 */ 312 313 static int p9_tag_init(struct p9_client *c) 314 { 315 int err = 0; 316 317 c->tagpool = p9_idpool_create(); 318 if (IS_ERR(c->tagpool)) { 319 err = PTR_ERR(c->tagpool); 320 goto error; 321 } 322 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */ 323 if (err < 0) { 324 p9_idpool_destroy(c->tagpool); 325 goto error; 326 } 327 c->max_tag = 0; 328 error: 329 return err; 330 } 331 332 /** 333 * p9_tag_cleanup - cleans up tags structure and reclaims resources 334 * @c: v9fs client struct 335 * 336 * This frees resources associated with the tags structure 337 * 338 */ 339 static void p9_tag_cleanup(struct p9_client *c) 340 { 341 int row, col; 342 343 /* check to insure all requests are idle */ 344 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 345 for (col = 0; col < P9_ROW_MAXTAG; col++) { 346 if (c->reqs[row][col].status != REQ_STATUS_IDLE) { 347 p9_debug(P9_DEBUG_MUX, 348 "Attempting to cleanup non-free tag %d,%d\n", 349 row, col); 350 /* TODO: delay execution of cleanup */ 351 return; 352 } 353 } 354 } 355 356 if (c->tagpool) { 357 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */ 358 p9_idpool_destroy(c->tagpool); 359 } 360 361 /* free requests associated with tags */ 362 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 363 for (col = 0; col < P9_ROW_MAXTAG; col++) { 364 kfree(c->reqs[row][col].wq); 365 kfree(c->reqs[row][col].tc); 366 kfree(c->reqs[row][col].rc); 367 } 368 kfree(c->reqs[row]); 369 } 370 c->max_tag = 0; 371 } 372 373 /** 374 * p9_free_req - free a request and clean-up as necessary 375 * c: client state 376 * r: request to release 377 * 378 */ 379 380 static void p9_free_req(struct p9_client *c, struct p9_req_t *r) 381 { 382 int tag = r->tc->tag; 383 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 384 385 r->status = REQ_STATUS_IDLE; 386 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) 387 p9_idpool_put(tag, c->tagpool); 388 } 389 390 /** 391 * p9_client_cb - call back from transport to client 392 * c: client state 393 * req: request received 394 * 395 */ 396 void p9_client_cb(struct p9_client *c, struct p9_req_t *req) 397 { 398 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); 399 wake_up(req->wq); 400 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); 401 } 402 EXPORT_SYMBOL(p9_client_cb); 403 404 /** 405 * p9_parse_header - parse header arguments out of a packet 406 * @pdu: packet to parse 407 * @size: size of packet 408 * @type: type of request 409 * @tag: tag of packet 410 * @rewind: set if we need to rewind offset afterwards 411 */ 412 413 int 414 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 415 int rewind) 416 { 417 int8_t r_type; 418 int16_t r_tag; 419 int32_t r_size; 420 int offset = pdu->offset; 421 int err; 422 423 pdu->offset = 0; 424 if (pdu->size == 0) 425 pdu->size = 7; 426 427 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 428 if (err) 429 goto rewind_and_exit; 430 431 pdu->size = r_size; 432 pdu->id = r_type; 433 pdu->tag = r_tag; 434 435 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 436 pdu->size, pdu->id, pdu->tag); 437 438 if (type) 439 *type = r_type; 440 if (tag) 441 *tag = r_tag; 442 if (size) 443 *size = r_size; 444 445 446 rewind_and_exit: 447 if (rewind) 448 pdu->offset = offset; 449 return err; 450 } 451 EXPORT_SYMBOL(p9_parse_header); 452 453 /** 454 * p9_check_errors - check 9p packet for error return and process it 455 * @c: current client instance 456 * @req: request to parse and check for error conditions 457 * 458 * returns error code if one is discovered, otherwise returns 0 459 * 460 * this will have to be more complicated if we have multiple 461 * error packet types 462 */ 463 464 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 465 { 466 int8_t type; 467 int err; 468 int ecode; 469 470 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 471 /* 472 * dump the response from server 473 * This should be after check errors which poplulate pdu_fcall. 474 */ 475 trace_9p_protocol_dump(c, req->rc); 476 if (err) { 477 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 478 return err; 479 } 480 if (type != P9_RERROR && type != P9_RLERROR) 481 return 0; 482 483 if (!p9_is_proto_dotl(c)) { 484 char *ename; 485 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 486 &ename, &ecode); 487 if (err) 488 goto out_err; 489 490 if (p9_is_proto_dotu(c)) 491 err = -ecode; 492 493 if (!err || !IS_ERR_VALUE(err)) { 494 err = p9_errstr2errno(ename, strlen(ename)); 495 496 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 497 -ecode, ename); 498 } 499 kfree(ename); 500 } else { 501 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 502 err = -ecode; 503 504 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 505 } 506 507 return err; 508 509 out_err: 510 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 511 512 return err; 513 } 514 515 /** 516 * p9_check_zc_errors - check 9p packet for error return and process it 517 * @c: current client instance 518 * @req: request to parse and check for error conditions 519 * @in_hdrlen: Size of response protocol buffer. 520 * 521 * returns error code if one is discovered, otherwise returns 0 522 * 523 * this will have to be more complicated if we have multiple 524 * error packet types 525 */ 526 527 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 528 char *uidata, int in_hdrlen, int kern_buf) 529 { 530 int err; 531 int ecode; 532 int8_t type; 533 char *ename = NULL; 534 535 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 536 /* 537 * dump the response from server 538 * This should be after parse_header which poplulate pdu_fcall. 539 */ 540 trace_9p_protocol_dump(c, req->rc); 541 if (err) { 542 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 543 return err; 544 } 545 546 if (type != P9_RERROR && type != P9_RLERROR) 547 return 0; 548 549 if (!p9_is_proto_dotl(c)) { 550 /* Error is reported in string format */ 551 uint16_t len; 552 /* 7 = header size for RERROR, 2 is the size of string len; */ 553 int inline_len = in_hdrlen - (7 + 2); 554 555 /* Read the size of error string */ 556 err = p9pdu_readf(req->rc, c->proto_version, "w", &len); 557 if (err) 558 goto out_err; 559 560 ename = kmalloc(len + 1, GFP_NOFS); 561 if (!ename) { 562 err = -ENOMEM; 563 goto out_err; 564 } 565 if (len <= inline_len) { 566 /* We have error in protocol buffer itself */ 567 if (pdu_read(req->rc, ename, len)) { 568 err = -EFAULT; 569 goto out_free; 570 571 } 572 } else { 573 /* 574 * Part of the data is in user space buffer. 575 */ 576 if (pdu_read(req->rc, ename, inline_len)) { 577 err = -EFAULT; 578 goto out_free; 579 580 } 581 if (kern_buf) { 582 memcpy(ename + inline_len, uidata, 583 len - inline_len); 584 } else { 585 err = copy_from_user(ename + inline_len, 586 uidata, len - inline_len); 587 if (err) { 588 err = -EFAULT; 589 goto out_free; 590 } 591 } 592 } 593 ename[len] = 0; 594 if (p9_is_proto_dotu(c)) { 595 /* For dotu we also have error code */ 596 err = p9pdu_readf(req->rc, 597 c->proto_version, "d", &ecode); 598 if (err) 599 goto out_free; 600 err = -ecode; 601 } 602 if (!err || !IS_ERR_VALUE(err)) { 603 err = p9_errstr2errno(ename, strlen(ename)); 604 605 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 606 -ecode, ename); 607 } 608 kfree(ename); 609 } else { 610 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 611 err = -ecode; 612 613 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 614 } 615 return err; 616 617 out_free: 618 kfree(ename); 619 out_err: 620 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 621 return err; 622 } 623 624 static struct p9_req_t * 625 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 626 627 /** 628 * p9_client_flush - flush (cancel) a request 629 * @c: client state 630 * @oldreq: request to cancel 631 * 632 * This sents a flush for a particular request and links 633 * the flush request to the original request. The current 634 * code only supports a single flush request although the protocol 635 * allows for multiple flush requests to be sent for a single request. 636 * 637 */ 638 639 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 640 { 641 struct p9_req_t *req; 642 int16_t oldtag; 643 int err; 644 645 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 646 if (err) 647 return err; 648 649 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 650 651 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 652 if (IS_ERR(req)) 653 return PTR_ERR(req); 654 655 656 /* if we haven't received a response for oldreq, 657 remove it from the list. */ 658 spin_lock(&c->lock); 659 if (oldreq->status == REQ_STATUS_FLSH) 660 list_del(&oldreq->req_list); 661 spin_unlock(&c->lock); 662 663 p9_free_req(c, req); 664 return 0; 665 } 666 667 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 668 int8_t type, int req_size, 669 const char *fmt, va_list ap) 670 { 671 int tag, err; 672 struct p9_req_t *req; 673 674 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 675 676 /* we allow for any status other than disconnected */ 677 if (c->status == Disconnected) 678 return ERR_PTR(-EIO); 679 680 /* if status is begin_disconnected we allow only clunk request */ 681 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 682 return ERR_PTR(-EIO); 683 684 tag = P9_NOTAG; 685 if (type != P9_TVERSION) { 686 tag = p9_idpool_get(c->tagpool); 687 if (tag < 0) 688 return ERR_PTR(-ENOMEM); 689 } 690 691 req = p9_tag_alloc(c, tag, req_size); 692 if (IS_ERR(req)) 693 return req; 694 695 /* marshall the data */ 696 p9pdu_prepare(req->tc, tag, type); 697 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 698 if (err) 699 goto reterr; 700 p9pdu_finalize(c, req->tc); 701 trace_9p_client_req(c, type, tag); 702 return req; 703 reterr: 704 p9_free_req(c, req); 705 return ERR_PTR(err); 706 } 707 708 /** 709 * p9_client_rpc - issue a request and wait for a response 710 * @c: client session 711 * @type: type of request 712 * @fmt: protocol format string (see protocol.c) 713 * 714 * Returns request structure (which client must free using p9_free_req) 715 */ 716 717 static struct p9_req_t * 718 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 719 { 720 va_list ap; 721 int sigpending, err; 722 unsigned long flags; 723 struct p9_req_t *req; 724 725 va_start(ap, fmt); 726 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 727 va_end(ap); 728 if (IS_ERR(req)) 729 return req; 730 731 if (signal_pending(current)) { 732 sigpending = 1; 733 clear_thread_flag(TIF_SIGPENDING); 734 } else 735 sigpending = 0; 736 737 err = c->trans_mod->request(c, req); 738 if (err < 0) { 739 if (err != -ERESTARTSYS && err != -EFAULT) 740 c->status = Disconnected; 741 goto reterr; 742 } 743 /* Wait for the response */ 744 err = wait_event_interruptible(*req->wq, 745 req->status >= REQ_STATUS_RCVD); 746 747 if (req->status == REQ_STATUS_ERROR) { 748 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 749 err = req->t_err; 750 } 751 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 752 p9_debug(P9_DEBUG_MUX, "flushing\n"); 753 sigpending = 1; 754 clear_thread_flag(TIF_SIGPENDING); 755 756 if (c->trans_mod->cancel(c, req)) 757 p9_client_flush(c, req); 758 759 /* if we received the response anyway, don't signal error */ 760 if (req->status == REQ_STATUS_RCVD) 761 err = 0; 762 } 763 if (sigpending) { 764 spin_lock_irqsave(¤t->sighand->siglock, flags); 765 recalc_sigpending(); 766 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 767 } 768 if (err < 0) 769 goto reterr; 770 771 err = p9_check_errors(c, req); 772 trace_9p_client_res(c, type, req->rc->tag, err); 773 if (!err) 774 return req; 775 reterr: 776 p9_free_req(c, req); 777 return ERR_PTR(err); 778 } 779 780 /** 781 * p9_client_zc_rpc - issue a request and wait for a response 782 * @c: client session 783 * @type: type of request 784 * @uidata: user bffer that should be ued for zero copy read 785 * @uodata: user buffer that shoud be user for zero copy write 786 * @inlen: read buffer size 787 * @olen: write buffer size 788 * @hdrlen: reader header size, This is the size of response protocol data 789 * @fmt: protocol format string (see protocol.c) 790 * 791 * Returns request structure (which client must free using p9_free_req) 792 */ 793 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 794 char *uidata, char *uodata, 795 int inlen, int olen, int in_hdrlen, 796 int kern_buf, const char *fmt, ...) 797 { 798 va_list ap; 799 int sigpending, err; 800 unsigned long flags; 801 struct p9_req_t *req; 802 803 va_start(ap, fmt); 804 /* 805 * We allocate a inline protocol data of only 4k bytes. 806 * The actual content is passed in zero-copy fashion. 807 */ 808 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 809 va_end(ap); 810 if (IS_ERR(req)) 811 return req; 812 813 if (signal_pending(current)) { 814 sigpending = 1; 815 clear_thread_flag(TIF_SIGPENDING); 816 } else 817 sigpending = 0; 818 819 /* If we are called with KERNEL_DS force kern_buf */ 820 if (segment_eq(get_fs(), KERNEL_DS)) 821 kern_buf = 1; 822 823 err = c->trans_mod->zc_request(c, req, uidata, uodata, 824 inlen, olen, in_hdrlen, kern_buf); 825 if (err < 0) { 826 if (err == -EIO) 827 c->status = Disconnected; 828 goto reterr; 829 } 830 if (req->status == REQ_STATUS_ERROR) { 831 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 832 err = req->t_err; 833 } 834 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 835 p9_debug(P9_DEBUG_MUX, "flushing\n"); 836 sigpending = 1; 837 clear_thread_flag(TIF_SIGPENDING); 838 839 if (c->trans_mod->cancel(c, req)) 840 p9_client_flush(c, req); 841 842 /* if we received the response anyway, don't signal error */ 843 if (req->status == REQ_STATUS_RCVD) 844 err = 0; 845 } 846 if (sigpending) { 847 spin_lock_irqsave(¤t->sighand->siglock, flags); 848 recalc_sigpending(); 849 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 850 } 851 if (err < 0) 852 goto reterr; 853 854 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf); 855 trace_9p_client_res(c, type, req->rc->tag, err); 856 if (!err) 857 return req; 858 reterr: 859 p9_free_req(c, req); 860 return ERR_PTR(err); 861 } 862 863 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 864 { 865 int ret; 866 struct p9_fid *fid; 867 unsigned long flags; 868 869 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 870 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 871 if (!fid) 872 return ERR_PTR(-ENOMEM); 873 874 ret = p9_idpool_get(clnt->fidpool); 875 if (ret < 0) { 876 ret = -ENOSPC; 877 goto error; 878 } 879 fid->fid = ret; 880 881 memset(&fid->qid, 0, sizeof(struct p9_qid)); 882 fid->mode = -1; 883 fid->uid = current_fsuid(); 884 fid->clnt = clnt; 885 fid->rdir = NULL; 886 spin_lock_irqsave(&clnt->lock, flags); 887 list_add(&fid->flist, &clnt->fidlist); 888 spin_unlock_irqrestore(&clnt->lock, flags); 889 890 return fid; 891 892 error: 893 kfree(fid); 894 return ERR_PTR(ret); 895 } 896 897 static void p9_fid_destroy(struct p9_fid *fid) 898 { 899 struct p9_client *clnt; 900 unsigned long flags; 901 902 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 903 clnt = fid->clnt; 904 p9_idpool_put(fid->fid, clnt->fidpool); 905 spin_lock_irqsave(&clnt->lock, flags); 906 list_del(&fid->flist); 907 spin_unlock_irqrestore(&clnt->lock, flags); 908 kfree(fid->rdir); 909 kfree(fid); 910 } 911 912 static int p9_client_version(struct p9_client *c) 913 { 914 int err = 0; 915 struct p9_req_t *req; 916 char *version; 917 int msize; 918 919 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 920 c->msize, c->proto_version); 921 922 switch (c->proto_version) { 923 case p9_proto_2000L: 924 req = p9_client_rpc(c, P9_TVERSION, "ds", 925 c->msize, "9P2000.L"); 926 break; 927 case p9_proto_2000u: 928 req = p9_client_rpc(c, P9_TVERSION, "ds", 929 c->msize, "9P2000.u"); 930 break; 931 case p9_proto_legacy: 932 req = p9_client_rpc(c, P9_TVERSION, "ds", 933 c->msize, "9P2000"); 934 break; 935 default: 936 return -EINVAL; 937 break; 938 } 939 940 if (IS_ERR(req)) 941 return PTR_ERR(req); 942 943 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 944 if (err) { 945 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 946 trace_9p_protocol_dump(c, req->rc); 947 goto error; 948 } 949 950 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 951 if (!strncmp(version, "9P2000.L", 8)) 952 c->proto_version = p9_proto_2000L; 953 else if (!strncmp(version, "9P2000.u", 8)) 954 c->proto_version = p9_proto_2000u; 955 else if (!strncmp(version, "9P2000", 6)) 956 c->proto_version = p9_proto_legacy; 957 else { 958 err = -EREMOTEIO; 959 goto error; 960 } 961 962 if (msize < c->msize) 963 c->msize = msize; 964 965 error: 966 kfree(version); 967 p9_free_req(c, req); 968 969 return err; 970 } 971 972 struct p9_client *p9_client_create(const char *dev_name, char *options) 973 { 974 int err; 975 struct p9_client *clnt; 976 977 err = 0; 978 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 979 if (!clnt) 980 return ERR_PTR(-ENOMEM); 981 982 clnt->trans_mod = NULL; 983 clnt->trans = NULL; 984 spin_lock_init(&clnt->lock); 985 INIT_LIST_HEAD(&clnt->fidlist); 986 987 err = p9_tag_init(clnt); 988 if (err < 0) 989 goto free_client; 990 991 err = parse_opts(options, clnt); 992 if (err < 0) 993 goto destroy_tagpool; 994 995 if (!clnt->trans_mod) 996 clnt->trans_mod = v9fs_get_default_trans(); 997 998 if (clnt->trans_mod == NULL) { 999 err = -EPROTONOSUPPORT; 1000 p9_debug(P9_DEBUG_ERROR, 1001 "No transport defined or default transport\n"); 1002 goto destroy_tagpool; 1003 } 1004 1005 clnt->fidpool = p9_idpool_create(); 1006 if (IS_ERR(clnt->fidpool)) { 1007 err = PTR_ERR(clnt->fidpool); 1008 goto put_trans; 1009 } 1010 1011 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1012 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1013 1014 err = clnt->trans_mod->create(clnt, dev_name, options); 1015 if (err) 1016 goto destroy_fidpool; 1017 1018 if (clnt->msize > clnt->trans_mod->maxsize) 1019 clnt->msize = clnt->trans_mod->maxsize; 1020 1021 err = p9_client_version(clnt); 1022 if (err) 1023 goto close_trans; 1024 1025 return clnt; 1026 1027 close_trans: 1028 clnt->trans_mod->close(clnt); 1029 destroy_fidpool: 1030 p9_idpool_destroy(clnt->fidpool); 1031 put_trans: 1032 v9fs_put_trans(clnt->trans_mod); 1033 destroy_tagpool: 1034 p9_idpool_destroy(clnt->tagpool); 1035 free_client: 1036 kfree(clnt); 1037 return ERR_PTR(err); 1038 } 1039 EXPORT_SYMBOL(p9_client_create); 1040 1041 void p9_client_destroy(struct p9_client *clnt) 1042 { 1043 struct p9_fid *fid, *fidptr; 1044 1045 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1046 1047 if (clnt->trans_mod) 1048 clnt->trans_mod->close(clnt); 1049 1050 v9fs_put_trans(clnt->trans_mod); 1051 1052 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { 1053 pr_info("Found fid %d not clunked\n", fid->fid); 1054 p9_fid_destroy(fid); 1055 } 1056 1057 if (clnt->fidpool) 1058 p9_idpool_destroy(clnt->fidpool); 1059 1060 p9_tag_cleanup(clnt); 1061 1062 kfree(clnt); 1063 } 1064 EXPORT_SYMBOL(p9_client_destroy); 1065 1066 void p9_client_disconnect(struct p9_client *clnt) 1067 { 1068 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1069 clnt->status = Disconnected; 1070 } 1071 EXPORT_SYMBOL(p9_client_disconnect); 1072 1073 void p9_client_begin_disconnect(struct p9_client *clnt) 1074 { 1075 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1076 clnt->status = BeginDisconnect; 1077 } 1078 EXPORT_SYMBOL(p9_client_begin_disconnect); 1079 1080 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1081 char *uname, u32 n_uname, char *aname) 1082 { 1083 int err = 0; 1084 struct p9_req_t *req; 1085 struct p9_fid *fid; 1086 struct p9_qid qid; 1087 1088 1089 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1090 afid ? afid->fid : -1, uname, aname); 1091 fid = p9_fid_create(clnt); 1092 if (IS_ERR(fid)) { 1093 err = PTR_ERR(fid); 1094 fid = NULL; 1095 goto error; 1096 } 1097 1098 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, 1099 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1100 if (IS_ERR(req)) { 1101 err = PTR_ERR(req); 1102 goto error; 1103 } 1104 1105 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 1106 if (err) { 1107 trace_9p_protocol_dump(clnt, req->rc); 1108 p9_free_req(clnt, req); 1109 goto error; 1110 } 1111 1112 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1113 qid.type, (unsigned long long)qid.path, qid.version); 1114 1115 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1116 1117 p9_free_req(clnt, req); 1118 return fid; 1119 1120 error: 1121 if (fid) 1122 p9_fid_destroy(fid); 1123 return ERR_PTR(err); 1124 } 1125 EXPORT_SYMBOL(p9_client_attach); 1126 1127 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1128 char **wnames, int clone) 1129 { 1130 int err; 1131 struct p9_client *clnt; 1132 struct p9_fid *fid; 1133 struct p9_qid *wqids; 1134 struct p9_req_t *req; 1135 uint16_t nwqids, count; 1136 1137 err = 0; 1138 wqids = NULL; 1139 clnt = oldfid->clnt; 1140 if (clone) { 1141 fid = p9_fid_create(clnt); 1142 if (IS_ERR(fid)) { 1143 err = PTR_ERR(fid); 1144 fid = NULL; 1145 goto error; 1146 } 1147 1148 fid->uid = oldfid->uid; 1149 } else 1150 fid = oldfid; 1151 1152 1153 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1154 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1155 1156 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1157 nwname, wnames); 1158 if (IS_ERR(req)) { 1159 err = PTR_ERR(req); 1160 goto error; 1161 } 1162 1163 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1164 if (err) { 1165 trace_9p_protocol_dump(clnt, req->rc); 1166 p9_free_req(clnt, req); 1167 goto clunk_fid; 1168 } 1169 p9_free_req(clnt, req); 1170 1171 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1172 1173 if (nwqids != nwname) { 1174 err = -ENOENT; 1175 goto clunk_fid; 1176 } 1177 1178 for (count = 0; count < nwqids; count++) 1179 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1180 count, wqids[count].type, 1181 (unsigned long long)wqids[count].path, 1182 wqids[count].version); 1183 1184 if (nwname) 1185 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1186 else 1187 fid->qid = oldfid->qid; 1188 1189 kfree(wqids); 1190 return fid; 1191 1192 clunk_fid: 1193 kfree(wqids); 1194 p9_client_clunk(fid); 1195 fid = NULL; 1196 1197 error: 1198 if (fid && (fid != oldfid)) 1199 p9_fid_destroy(fid); 1200 1201 return ERR_PTR(err); 1202 } 1203 EXPORT_SYMBOL(p9_client_walk); 1204 1205 int p9_client_open(struct p9_fid *fid, int mode) 1206 { 1207 int err; 1208 struct p9_client *clnt; 1209 struct p9_req_t *req; 1210 struct p9_qid qid; 1211 int iounit; 1212 1213 clnt = fid->clnt; 1214 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1215 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1216 err = 0; 1217 1218 if (fid->mode != -1) 1219 return -EINVAL; 1220 1221 if (p9_is_proto_dotl(clnt)) 1222 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1223 else 1224 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1225 if (IS_ERR(req)) { 1226 err = PTR_ERR(req); 1227 goto error; 1228 } 1229 1230 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1231 if (err) { 1232 trace_9p_protocol_dump(clnt, req->rc); 1233 goto free_and_error; 1234 } 1235 1236 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1237 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1238 (unsigned long long)qid.path, qid.version, iounit); 1239 1240 fid->mode = mode; 1241 fid->iounit = iounit; 1242 1243 free_and_error: 1244 p9_free_req(clnt, req); 1245 error: 1246 return err; 1247 } 1248 EXPORT_SYMBOL(p9_client_open); 1249 1250 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode, 1251 gid_t gid, struct p9_qid *qid) 1252 { 1253 int err = 0; 1254 struct p9_client *clnt; 1255 struct p9_req_t *req; 1256 int iounit; 1257 1258 p9_debug(P9_DEBUG_9P, 1259 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1260 ofid->fid, name, flags, mode, gid); 1261 clnt = ofid->clnt; 1262 1263 if (ofid->mode != -1) 1264 return -EINVAL; 1265 1266 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags, 1267 mode, gid); 1268 if (IS_ERR(req)) { 1269 err = PTR_ERR(req); 1270 goto error; 1271 } 1272 1273 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1274 if (err) { 1275 trace_9p_protocol_dump(clnt, req->rc); 1276 goto free_and_error; 1277 } 1278 1279 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1280 qid->type, 1281 (unsigned long long)qid->path, 1282 qid->version, iounit); 1283 1284 ofid->mode = mode; 1285 ofid->iounit = iounit; 1286 1287 free_and_error: 1288 p9_free_req(clnt, req); 1289 error: 1290 return err; 1291 } 1292 EXPORT_SYMBOL(p9_client_create_dotl); 1293 1294 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, 1295 char *extension) 1296 { 1297 int err; 1298 struct p9_client *clnt; 1299 struct p9_req_t *req; 1300 struct p9_qid qid; 1301 int iounit; 1302 1303 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1304 fid->fid, name, perm, mode); 1305 err = 0; 1306 clnt = fid->clnt; 1307 1308 if (fid->mode != -1) 1309 return -EINVAL; 1310 1311 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1312 mode, extension); 1313 if (IS_ERR(req)) { 1314 err = PTR_ERR(req); 1315 goto error; 1316 } 1317 1318 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1319 if (err) { 1320 trace_9p_protocol_dump(clnt, req->rc); 1321 goto free_and_error; 1322 } 1323 1324 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1325 qid.type, 1326 (unsigned long long)qid.path, 1327 qid.version, iounit); 1328 1329 fid->mode = mode; 1330 fid->iounit = iounit; 1331 1332 free_and_error: 1333 p9_free_req(clnt, req); 1334 error: 1335 return err; 1336 } 1337 EXPORT_SYMBOL(p9_client_fcreate); 1338 1339 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid, 1340 struct p9_qid *qid) 1341 { 1342 int err = 0; 1343 struct p9_client *clnt; 1344 struct p9_req_t *req; 1345 1346 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1347 dfid->fid, name, symtgt); 1348 clnt = dfid->clnt; 1349 1350 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt, 1351 gid); 1352 if (IS_ERR(req)) { 1353 err = PTR_ERR(req); 1354 goto error; 1355 } 1356 1357 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1358 if (err) { 1359 trace_9p_protocol_dump(clnt, req->rc); 1360 goto free_and_error; 1361 } 1362 1363 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1364 qid->type, (unsigned long long)qid->path, qid->version); 1365 1366 free_and_error: 1367 p9_free_req(clnt, req); 1368 error: 1369 return err; 1370 } 1371 EXPORT_SYMBOL(p9_client_symlink); 1372 1373 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname) 1374 { 1375 struct p9_client *clnt; 1376 struct p9_req_t *req; 1377 1378 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1379 dfid->fid, oldfid->fid, newname); 1380 clnt = dfid->clnt; 1381 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1382 newname); 1383 if (IS_ERR(req)) 1384 return PTR_ERR(req); 1385 1386 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1387 p9_free_req(clnt, req); 1388 return 0; 1389 } 1390 EXPORT_SYMBOL(p9_client_link); 1391 1392 int p9_client_fsync(struct p9_fid *fid, int datasync) 1393 { 1394 int err; 1395 struct p9_client *clnt; 1396 struct p9_req_t *req; 1397 1398 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1399 fid->fid, datasync); 1400 err = 0; 1401 clnt = fid->clnt; 1402 1403 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1404 if (IS_ERR(req)) { 1405 err = PTR_ERR(req); 1406 goto error; 1407 } 1408 1409 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1410 1411 p9_free_req(clnt, req); 1412 1413 error: 1414 return err; 1415 } 1416 EXPORT_SYMBOL(p9_client_fsync); 1417 1418 int p9_client_clunk(struct p9_fid *fid) 1419 { 1420 int err; 1421 struct p9_client *clnt; 1422 struct p9_req_t *req; 1423 1424 if (!fid) { 1425 pr_warn("%s (%d): Trying to clunk with NULL fid\n", 1426 __func__, task_pid_nr(current)); 1427 dump_stack(); 1428 return 0; 1429 } 1430 1431 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid); 1432 err = 0; 1433 clnt = fid->clnt; 1434 1435 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1436 if (IS_ERR(req)) { 1437 err = PTR_ERR(req); 1438 goto error; 1439 } 1440 1441 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1442 1443 p9_free_req(clnt, req); 1444 error: 1445 /* 1446 * Fid is not valid even after a failed clunk 1447 */ 1448 p9_fid_destroy(fid); 1449 return err; 1450 } 1451 EXPORT_SYMBOL(p9_client_clunk); 1452 1453 int p9_client_remove(struct p9_fid *fid) 1454 { 1455 int err; 1456 struct p9_client *clnt; 1457 struct p9_req_t *req; 1458 1459 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1460 err = 0; 1461 clnt = fid->clnt; 1462 1463 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1464 if (IS_ERR(req)) { 1465 err = PTR_ERR(req); 1466 goto error; 1467 } 1468 1469 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1470 1471 p9_free_req(clnt, req); 1472 error: 1473 p9_fid_destroy(fid); 1474 return err; 1475 } 1476 EXPORT_SYMBOL(p9_client_remove); 1477 1478 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1479 { 1480 int err = 0; 1481 struct p9_req_t *req; 1482 struct p9_client *clnt; 1483 1484 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1485 dfid->fid, name, flags); 1486 1487 clnt = dfid->clnt; 1488 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1489 if (IS_ERR(req)) { 1490 err = PTR_ERR(req); 1491 goto error; 1492 } 1493 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1494 1495 p9_free_req(clnt, req); 1496 error: 1497 return err; 1498 } 1499 EXPORT_SYMBOL(p9_client_unlinkat); 1500 1501 int 1502 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, 1503 u32 count) 1504 { 1505 char *dataptr; 1506 int kernel_buf = 0; 1507 struct p9_req_t *req; 1508 struct p9_client *clnt; 1509 int err, rsize, non_zc = 0; 1510 1511 1512 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1513 fid->fid, (long long unsigned) offset, count); 1514 err = 0; 1515 clnt = fid->clnt; 1516 1517 rsize = fid->iounit; 1518 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1519 rsize = clnt->msize - P9_IOHDRSZ; 1520 1521 if (count < rsize) 1522 rsize = count; 1523 1524 /* Don't bother zerocopy for small IO (< 1024) */ 1525 if (clnt->trans_mod->zc_request && rsize > 1024) { 1526 char *indata; 1527 if (data) { 1528 kernel_buf = 1; 1529 indata = data; 1530 } else 1531 indata = (char *)udata; 1532 /* 1533 * response header len is 11 1534 * PDU Header(7) + IO Size (4) 1535 */ 1536 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0, 1537 11, kernel_buf, "dqd", fid->fid, 1538 offset, rsize); 1539 } else { 1540 non_zc = 1; 1541 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1542 rsize); 1543 } 1544 if (IS_ERR(req)) { 1545 err = PTR_ERR(req); 1546 goto error; 1547 } 1548 1549 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1550 if (err) { 1551 trace_9p_protocol_dump(clnt, req->rc); 1552 goto free_and_error; 1553 } 1554 1555 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1556 1557 if (non_zc) { 1558 if (data) { 1559 memmove(data, dataptr, count); 1560 } else { 1561 err = copy_to_user(udata, dataptr, count); 1562 if (err) { 1563 err = -EFAULT; 1564 goto free_and_error; 1565 } 1566 } 1567 } 1568 p9_free_req(clnt, req); 1569 return count; 1570 1571 free_and_error: 1572 p9_free_req(clnt, req); 1573 error: 1574 return err; 1575 } 1576 EXPORT_SYMBOL(p9_client_read); 1577 1578 int 1579 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, 1580 u64 offset, u32 count) 1581 { 1582 int err, rsize; 1583 int kernel_buf = 0; 1584 struct p9_client *clnt; 1585 struct p9_req_t *req; 1586 1587 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", 1588 fid->fid, (long long unsigned) offset, count); 1589 err = 0; 1590 clnt = fid->clnt; 1591 1592 rsize = fid->iounit; 1593 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1594 rsize = clnt->msize - P9_IOHDRSZ; 1595 1596 if (count < rsize) 1597 rsize = count; 1598 1599 /* Don't bother zerocopy for small IO (< 1024) */ 1600 if (clnt->trans_mod->zc_request && rsize > 1024) { 1601 char *odata; 1602 if (data) { 1603 kernel_buf = 1; 1604 odata = data; 1605 } else 1606 odata = (char *)udata; 1607 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize, 1608 P9_ZC_HDR_SZ, kernel_buf, "dqd", 1609 fid->fid, offset, rsize); 1610 } else { 1611 if (data) 1612 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, 1613 offset, rsize, data); 1614 else 1615 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, 1616 offset, rsize, udata); 1617 } 1618 if (IS_ERR(req)) { 1619 err = PTR_ERR(req); 1620 goto error; 1621 } 1622 1623 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1624 if (err) { 1625 trace_9p_protocol_dump(clnt, req->rc); 1626 goto free_and_error; 1627 } 1628 1629 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1630 1631 p9_free_req(clnt, req); 1632 return count; 1633 1634 free_and_error: 1635 p9_free_req(clnt, req); 1636 error: 1637 return err; 1638 } 1639 EXPORT_SYMBOL(p9_client_write); 1640 1641 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1642 { 1643 int err; 1644 struct p9_client *clnt; 1645 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1646 struct p9_req_t *req; 1647 u16 ignored; 1648 1649 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1650 1651 if (!ret) 1652 return ERR_PTR(-ENOMEM); 1653 1654 err = 0; 1655 clnt = fid->clnt; 1656 1657 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1658 if (IS_ERR(req)) { 1659 err = PTR_ERR(req); 1660 goto error; 1661 } 1662 1663 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1664 if (err) { 1665 trace_9p_protocol_dump(clnt, req->rc); 1666 p9_free_req(clnt, req); 1667 goto error; 1668 } 1669 1670 p9_debug(P9_DEBUG_9P, 1671 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1672 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1673 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1674 "<<< uid=%d gid=%d n_muid=%d\n", 1675 ret->size, ret->type, ret->dev, ret->qid.type, 1676 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1677 ret->atime, ret->mtime, (unsigned long long)ret->length, 1678 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1679 ret->n_uid, ret->n_gid, ret->n_muid); 1680 1681 p9_free_req(clnt, req); 1682 return ret; 1683 1684 error: 1685 kfree(ret); 1686 return ERR_PTR(err); 1687 } 1688 EXPORT_SYMBOL(p9_client_stat); 1689 1690 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1691 u64 request_mask) 1692 { 1693 int err; 1694 struct p9_client *clnt; 1695 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1696 GFP_KERNEL); 1697 struct p9_req_t *req; 1698 1699 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1700 fid->fid, request_mask); 1701 1702 if (!ret) 1703 return ERR_PTR(-ENOMEM); 1704 1705 err = 0; 1706 clnt = fid->clnt; 1707 1708 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1709 if (IS_ERR(req)) { 1710 err = PTR_ERR(req); 1711 goto error; 1712 } 1713 1714 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1715 if (err) { 1716 trace_9p_protocol_dump(clnt, req->rc); 1717 p9_free_req(clnt, req); 1718 goto error; 1719 } 1720 1721 p9_debug(P9_DEBUG_9P, 1722 "<<< RGETATTR st_result_mask=%lld\n" 1723 "<<< qid=%x.%llx.%x\n" 1724 "<<< st_mode=%8.8x st_nlink=%llu\n" 1725 "<<< st_uid=%d st_gid=%d\n" 1726 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1727 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1728 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1729 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1730 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1731 "<<< st_gen=%lld st_data_version=%lld", 1732 ret->st_result_mask, ret->qid.type, ret->qid.path, 1733 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid, 1734 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize, 1735 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1736 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1737 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1738 ret->st_gen, ret->st_data_version); 1739 1740 p9_free_req(clnt, req); 1741 return ret; 1742 1743 error: 1744 kfree(ret); 1745 return ERR_PTR(err); 1746 } 1747 EXPORT_SYMBOL(p9_client_getattr_dotl); 1748 1749 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1750 { 1751 int ret; 1752 1753 /* NOTE: size shouldn't include its own length */ 1754 /* size[2] type[2] dev[4] qid[13] */ 1755 /* mode[4] atime[4] mtime[4] length[8]*/ 1756 /* name[s] uid[s] gid[s] muid[s] */ 1757 ret = 2+4+13+4+4+4+8+2+2+2+2; 1758 1759 if (wst->name) 1760 ret += strlen(wst->name); 1761 if (wst->uid) 1762 ret += strlen(wst->uid); 1763 if (wst->gid) 1764 ret += strlen(wst->gid); 1765 if (wst->muid) 1766 ret += strlen(wst->muid); 1767 1768 if ((proto_version == p9_proto_2000u) || 1769 (proto_version == p9_proto_2000L)) { 1770 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1771 if (wst->extension) 1772 ret += strlen(wst->extension); 1773 } 1774 1775 return ret; 1776 } 1777 1778 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1779 { 1780 int err; 1781 struct p9_req_t *req; 1782 struct p9_client *clnt; 1783 1784 err = 0; 1785 clnt = fid->clnt; 1786 wst->size = p9_client_statsize(wst, clnt->proto_version); 1787 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1788 p9_debug(P9_DEBUG_9P, 1789 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1790 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1791 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1792 " uid=%d gid=%d n_muid=%d\n", 1793 wst->size, wst->type, wst->dev, wst->qid.type, 1794 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1795 wst->atime, wst->mtime, (unsigned long long)wst->length, 1796 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1797 wst->n_uid, wst->n_gid, wst->n_muid); 1798 1799 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1800 if (IS_ERR(req)) { 1801 err = PTR_ERR(req); 1802 goto error; 1803 } 1804 1805 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1806 1807 p9_free_req(clnt, req); 1808 error: 1809 return err; 1810 } 1811 EXPORT_SYMBOL(p9_client_wstat); 1812 1813 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1814 { 1815 int err; 1816 struct p9_req_t *req; 1817 struct p9_client *clnt; 1818 1819 err = 0; 1820 clnt = fid->clnt; 1821 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1822 p9_debug(P9_DEBUG_9P, 1823 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1824 " atime_sec=%lld atime_nsec=%lld\n" 1825 " mtime_sec=%lld mtime_nsec=%lld\n", 1826 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid, 1827 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1828 p9attr->mtime_sec, p9attr->mtime_nsec); 1829 1830 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1831 1832 if (IS_ERR(req)) { 1833 err = PTR_ERR(req); 1834 goto error; 1835 } 1836 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1837 p9_free_req(clnt, req); 1838 error: 1839 return err; 1840 } 1841 EXPORT_SYMBOL(p9_client_setattr); 1842 1843 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1844 { 1845 int err; 1846 struct p9_req_t *req; 1847 struct p9_client *clnt; 1848 1849 err = 0; 1850 clnt = fid->clnt; 1851 1852 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1853 1854 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1855 if (IS_ERR(req)) { 1856 err = PTR_ERR(req); 1857 goto error; 1858 } 1859 1860 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1861 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1862 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1863 if (err) { 1864 trace_9p_protocol_dump(clnt, req->rc); 1865 p9_free_req(clnt, req); 1866 goto error; 1867 } 1868 1869 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1870 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1871 "fsid %llu namelen %ld\n", 1872 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1873 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1874 sb->fsid, (long int)sb->namelen); 1875 1876 p9_free_req(clnt, req); 1877 error: 1878 return err; 1879 } 1880 EXPORT_SYMBOL(p9_client_statfs); 1881 1882 int p9_client_rename(struct p9_fid *fid, 1883 struct p9_fid *newdirfid, const char *name) 1884 { 1885 int err; 1886 struct p9_req_t *req; 1887 struct p9_client *clnt; 1888 1889 err = 0; 1890 clnt = fid->clnt; 1891 1892 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1893 fid->fid, newdirfid->fid, name); 1894 1895 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1896 newdirfid->fid, name); 1897 if (IS_ERR(req)) { 1898 err = PTR_ERR(req); 1899 goto error; 1900 } 1901 1902 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1903 1904 p9_free_req(clnt, req); 1905 error: 1906 return err; 1907 } 1908 EXPORT_SYMBOL(p9_client_rename); 1909 1910 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1911 struct p9_fid *newdirfid, const char *new_name) 1912 { 1913 int err; 1914 struct p9_req_t *req; 1915 struct p9_client *clnt; 1916 1917 err = 0; 1918 clnt = olddirfid->clnt; 1919 1920 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1921 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1922 newdirfid->fid, new_name); 1923 1924 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1925 old_name, newdirfid->fid, new_name); 1926 if (IS_ERR(req)) { 1927 err = PTR_ERR(req); 1928 goto error; 1929 } 1930 1931 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1932 newdirfid->fid, new_name); 1933 1934 p9_free_req(clnt, req); 1935 error: 1936 return err; 1937 } 1938 EXPORT_SYMBOL(p9_client_renameat); 1939 1940 /* 1941 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1942 */ 1943 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1944 const char *attr_name, u64 *attr_size) 1945 { 1946 int err; 1947 struct p9_req_t *req; 1948 struct p9_client *clnt; 1949 struct p9_fid *attr_fid; 1950 1951 err = 0; 1952 clnt = file_fid->clnt; 1953 attr_fid = p9_fid_create(clnt); 1954 if (IS_ERR(attr_fid)) { 1955 err = PTR_ERR(attr_fid); 1956 attr_fid = NULL; 1957 goto error; 1958 } 1959 p9_debug(P9_DEBUG_9P, 1960 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 1961 file_fid->fid, attr_fid->fid, attr_name); 1962 1963 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1964 file_fid->fid, attr_fid->fid, attr_name); 1965 if (IS_ERR(req)) { 1966 err = PTR_ERR(req); 1967 goto error; 1968 } 1969 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 1970 if (err) { 1971 trace_9p_protocol_dump(clnt, req->rc); 1972 p9_free_req(clnt, req); 1973 goto clunk_fid; 1974 } 1975 p9_free_req(clnt, req); 1976 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 1977 attr_fid->fid, *attr_size); 1978 return attr_fid; 1979 clunk_fid: 1980 p9_client_clunk(attr_fid); 1981 attr_fid = NULL; 1982 error: 1983 if (attr_fid && (attr_fid != file_fid)) 1984 p9_fid_destroy(attr_fid); 1985 1986 return ERR_PTR(err); 1987 } 1988 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 1989 1990 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 1991 u64 attr_size, int flags) 1992 { 1993 int err; 1994 struct p9_req_t *req; 1995 struct p9_client *clnt; 1996 1997 p9_debug(P9_DEBUG_9P, 1998 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 1999 fid->fid, name, (long long)attr_size, flags); 2000 err = 0; 2001 clnt = fid->clnt; 2002 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2003 fid->fid, name, attr_size, flags); 2004 if (IS_ERR(req)) { 2005 err = PTR_ERR(req); 2006 goto error; 2007 } 2008 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2009 p9_free_req(clnt, req); 2010 error: 2011 return err; 2012 } 2013 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2014 2015 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2016 { 2017 int err, rsize, non_zc = 0; 2018 struct p9_client *clnt; 2019 struct p9_req_t *req; 2020 char *dataptr; 2021 2022 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2023 fid->fid, (long long unsigned) offset, count); 2024 2025 err = 0; 2026 clnt = fid->clnt; 2027 2028 rsize = fid->iounit; 2029 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2030 rsize = clnt->msize - P9_READDIRHDRSZ; 2031 2032 if (count < rsize) 2033 rsize = count; 2034 2035 /* Don't bother zerocopy for small IO (< 1024) */ 2036 if (clnt->trans_mod->zc_request && rsize > 1024) { 2037 /* 2038 * response header len is 11 2039 * PDU Header(7) + IO Size (4) 2040 */ 2041 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0, 2042 11, 1, "dqd", fid->fid, offset, rsize); 2043 } else { 2044 non_zc = 1; 2045 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2046 offset, rsize); 2047 } 2048 if (IS_ERR(req)) { 2049 err = PTR_ERR(req); 2050 goto error; 2051 } 2052 2053 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 2054 if (err) { 2055 trace_9p_protocol_dump(clnt, req->rc); 2056 goto free_and_error; 2057 } 2058 2059 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2060 2061 if (non_zc) 2062 memmove(data, dataptr, count); 2063 2064 p9_free_req(clnt, req); 2065 return count; 2066 2067 free_and_error: 2068 p9_free_req(clnt, req); 2069 error: 2070 return err; 2071 } 2072 EXPORT_SYMBOL(p9_client_readdir); 2073 2074 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode, 2075 dev_t rdev, gid_t gid, struct p9_qid *qid) 2076 { 2077 int err; 2078 struct p9_client *clnt; 2079 struct p9_req_t *req; 2080 2081 err = 0; 2082 clnt = fid->clnt; 2083 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2084 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2085 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode, 2086 MAJOR(rdev), MINOR(rdev), gid); 2087 if (IS_ERR(req)) 2088 return PTR_ERR(req); 2089 2090 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2091 if (err) { 2092 trace_9p_protocol_dump(clnt, req->rc); 2093 goto error; 2094 } 2095 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2096 (unsigned long long)qid->path, qid->version); 2097 2098 error: 2099 p9_free_req(clnt, req); 2100 return err; 2101 2102 } 2103 EXPORT_SYMBOL(p9_client_mknod_dotl); 2104 2105 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode, 2106 gid_t gid, struct p9_qid *qid) 2107 { 2108 int err; 2109 struct p9_client *clnt; 2110 struct p9_req_t *req; 2111 2112 err = 0; 2113 clnt = fid->clnt; 2114 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2115 fid->fid, name, mode, gid); 2116 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode, 2117 gid); 2118 if (IS_ERR(req)) 2119 return PTR_ERR(req); 2120 2121 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2122 if (err) { 2123 trace_9p_protocol_dump(clnt, req->rc); 2124 goto error; 2125 } 2126 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2127 (unsigned long long)qid->path, qid->version); 2128 2129 error: 2130 p9_free_req(clnt, req); 2131 return err; 2132 2133 } 2134 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2135 2136 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2137 { 2138 int err; 2139 struct p9_client *clnt; 2140 struct p9_req_t *req; 2141 2142 err = 0; 2143 clnt = fid->clnt; 2144 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2145 "start %lld length %lld proc_id %d client_id %s\n", 2146 fid->fid, flock->type, flock->flags, flock->start, 2147 flock->length, flock->proc_id, flock->client_id); 2148 2149 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2150 flock->flags, flock->start, flock->length, 2151 flock->proc_id, flock->client_id); 2152 2153 if (IS_ERR(req)) 2154 return PTR_ERR(req); 2155 2156 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); 2157 if (err) { 2158 trace_9p_protocol_dump(clnt, req->rc); 2159 goto error; 2160 } 2161 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2162 error: 2163 p9_free_req(clnt, req); 2164 return err; 2165 2166 } 2167 EXPORT_SYMBOL(p9_client_lock_dotl); 2168 2169 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2170 { 2171 int err; 2172 struct p9_client *clnt; 2173 struct p9_req_t *req; 2174 2175 err = 0; 2176 clnt = fid->clnt; 2177 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2178 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2179 glock->start, glock->length, glock->proc_id, glock->client_id); 2180 2181 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2182 glock->start, glock->length, glock->proc_id, glock->client_id); 2183 2184 if (IS_ERR(req)) 2185 return PTR_ERR(req); 2186 2187 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, 2188 &glock->start, &glock->length, &glock->proc_id, 2189 &glock->client_id); 2190 if (err) { 2191 trace_9p_protocol_dump(clnt, req->rc); 2192 goto error; 2193 } 2194 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2195 "proc_id %d client_id %s\n", glock->type, glock->start, 2196 glock->length, glock->proc_id, glock->client_id); 2197 error: 2198 p9_free_req(clnt, req); 2199 return err; 2200 } 2201 EXPORT_SYMBOL(p9_client_getlock_dotl); 2202 2203 int p9_client_readlink(struct p9_fid *fid, char **target) 2204 { 2205 int err; 2206 struct p9_client *clnt; 2207 struct p9_req_t *req; 2208 2209 err = 0; 2210 clnt = fid->clnt; 2211 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2212 2213 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2214 if (IS_ERR(req)) 2215 return PTR_ERR(req); 2216 2217 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); 2218 if (err) { 2219 trace_9p_protocol_dump(clnt, req->rc); 2220 goto error; 2221 } 2222 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2223 error: 2224 p9_free_req(clnt, req); 2225 return err; 2226 } 2227 EXPORT_SYMBOL(p9_client_readlink); 2228