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 /* 80 * Some error codes are taken directly from the server replies, 81 * make sure they are valid. 82 */ 83 static int safe_errno(int err) 84 { 85 if ((err > 0) || (err < -MAX_ERRNO)) { 86 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 87 return -EPROTO; 88 } 89 return err; 90 } 91 92 93 /* Interpret mount option for protocol version */ 94 static int get_protocol_version(char *s) 95 { 96 int version = -EINVAL; 97 98 if (!strcmp(s, "9p2000")) { 99 version = p9_proto_legacy; 100 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 101 } else if (!strcmp(s, "9p2000.u")) { 102 version = p9_proto_2000u; 103 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 104 } else if (!strcmp(s, "9p2000.L")) { 105 version = p9_proto_2000L; 106 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 107 } else 108 pr_info("Unknown protocol version %s\n", s); 109 110 return version; 111 } 112 113 /** 114 * parse_options - parse mount options into client structure 115 * @opts: options string passed from mount 116 * @clnt: existing v9fs client information 117 * 118 * Return 0 upon success, -ERRNO upon failure 119 */ 120 121 static int parse_opts(char *opts, struct p9_client *clnt) 122 { 123 char *options, *tmp_options; 124 char *p; 125 substring_t args[MAX_OPT_ARGS]; 126 int option; 127 char *s; 128 int ret = 0; 129 130 clnt->proto_version = p9_proto_2000L; 131 clnt->msize = 8192; 132 133 if (!opts) 134 return 0; 135 136 tmp_options = kstrdup(opts, GFP_KERNEL); 137 if (!tmp_options) { 138 p9_debug(P9_DEBUG_ERROR, 139 "failed to allocate copy of option string\n"); 140 return -ENOMEM; 141 } 142 options = tmp_options; 143 144 while ((p = strsep(&options, ",")) != NULL) { 145 int token, r; 146 if (!*p) 147 continue; 148 token = match_token(p, tokens, args); 149 switch (token) { 150 case Opt_msize: 151 r = match_int(&args[0], &option); 152 if (r < 0) { 153 p9_debug(P9_DEBUG_ERROR, 154 "integer field, but no integer?\n"); 155 ret = r; 156 continue; 157 } 158 clnt->msize = option; 159 break; 160 case Opt_trans: 161 s = match_strdup(&args[0]); 162 if (!s) { 163 ret = -ENOMEM; 164 p9_debug(P9_DEBUG_ERROR, 165 "problem allocating copy of trans arg\n"); 166 goto free_and_return; 167 } 168 clnt->trans_mod = v9fs_get_trans_by_name(s); 169 if (clnt->trans_mod == NULL) { 170 pr_info("Could not find request transport: %s\n", 171 s); 172 ret = -EINVAL; 173 kfree(s); 174 goto free_and_return; 175 } 176 kfree(s); 177 break; 178 case Opt_legacy: 179 clnt->proto_version = p9_proto_legacy; 180 break; 181 case Opt_version: 182 s = match_strdup(&args[0]); 183 if (!s) { 184 ret = -ENOMEM; 185 p9_debug(P9_DEBUG_ERROR, 186 "problem allocating copy of version arg\n"); 187 goto free_and_return; 188 } 189 ret = get_protocol_version(s); 190 if (ret == -EINVAL) { 191 kfree(s); 192 goto free_and_return; 193 } 194 kfree(s); 195 clnt->proto_version = ret; 196 break; 197 default: 198 continue; 199 } 200 } 201 202 free_and_return: 203 kfree(tmp_options); 204 return ret; 205 } 206 207 struct p9_fcall *p9_fcall_alloc(int alloc_msize) 208 { 209 struct p9_fcall *fc; 210 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS); 211 if (!fc) 212 return NULL; 213 fc->capacity = alloc_msize; 214 fc->sdata = (char *) fc + sizeof(struct p9_fcall); 215 return fc; 216 } 217 218 /** 219 * p9_tag_alloc - lookup/allocate a request by tag 220 * @c: client session to lookup tag within 221 * @tag: numeric id for transaction 222 * 223 * this is a simple array lookup, but will grow the 224 * request_slots as necessary to accommodate transaction 225 * ids which did not previously have a slot. 226 * 227 * this code relies on the client spinlock to manage locks, its 228 * possible we should switch to something else, but I'd rather 229 * stick with something low-overhead for the common case. 230 * 231 */ 232 233 static struct p9_req_t * 234 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size) 235 { 236 unsigned long flags; 237 int row, col; 238 struct p9_req_t *req; 239 int alloc_msize = min(c->msize, max_size); 240 241 /* This looks up the original request by tag so we know which 242 * buffer to read the data into */ 243 tag++; 244 245 if (tag >= c->max_tag) { 246 spin_lock_irqsave(&c->lock, flags); 247 /* check again since original check was outside of lock */ 248 while (tag >= c->max_tag) { 249 row = (tag / P9_ROW_MAXTAG); 250 c->reqs[row] = kcalloc(P9_ROW_MAXTAG, 251 sizeof(struct p9_req_t), GFP_ATOMIC); 252 253 if (!c->reqs[row]) { 254 pr_err("Couldn't grow tag array\n"); 255 spin_unlock_irqrestore(&c->lock, flags); 256 return ERR_PTR(-ENOMEM); 257 } 258 for (col = 0; col < P9_ROW_MAXTAG; col++) { 259 c->reqs[row][col].status = REQ_STATUS_IDLE; 260 c->reqs[row][col].tc = NULL; 261 } 262 c->max_tag += P9_ROW_MAXTAG; 263 } 264 spin_unlock_irqrestore(&c->lock, flags); 265 } 266 row = tag / P9_ROW_MAXTAG; 267 col = tag % P9_ROW_MAXTAG; 268 269 req = &c->reqs[row][col]; 270 if (!req->wq) { 271 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS); 272 if (!req->wq) 273 goto grow_failed; 274 init_waitqueue_head(req->wq); 275 } 276 277 if (!req->tc) 278 req->tc = p9_fcall_alloc(alloc_msize); 279 if (!req->rc) 280 req->rc = p9_fcall_alloc(alloc_msize); 281 if (!req->tc || !req->rc) 282 goto grow_failed; 283 284 p9pdu_reset(req->tc); 285 p9pdu_reset(req->rc); 286 287 req->tc->tag = tag-1; 288 req->status = REQ_STATUS_ALLOC; 289 290 return req; 291 292 grow_failed: 293 pr_err("Couldn't grow tag array\n"); 294 kfree(req->tc); 295 kfree(req->rc); 296 kfree(req->wq); 297 req->tc = req->rc = NULL; 298 req->wq = NULL; 299 return ERR_PTR(-ENOMEM); 300 } 301 302 /** 303 * p9_tag_lookup - lookup a request by tag 304 * @c: client session to lookup tag within 305 * @tag: numeric id for transaction 306 * 307 */ 308 309 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 310 { 311 int row, col; 312 313 /* This looks up the original request by tag so we know which 314 * buffer to read the data into */ 315 tag++; 316 317 if(tag >= c->max_tag) 318 return NULL; 319 320 row = tag / P9_ROW_MAXTAG; 321 col = tag % P9_ROW_MAXTAG; 322 323 return &c->reqs[row][col]; 324 } 325 EXPORT_SYMBOL(p9_tag_lookup); 326 327 /** 328 * p9_tag_init - setup tags structure and contents 329 * @c: v9fs client struct 330 * 331 * This initializes the tags structure for each client instance. 332 * 333 */ 334 335 static int p9_tag_init(struct p9_client *c) 336 { 337 int err = 0; 338 339 c->tagpool = p9_idpool_create(); 340 if (IS_ERR(c->tagpool)) { 341 err = PTR_ERR(c->tagpool); 342 goto error; 343 } 344 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */ 345 if (err < 0) { 346 p9_idpool_destroy(c->tagpool); 347 goto error; 348 } 349 c->max_tag = 0; 350 error: 351 return err; 352 } 353 354 /** 355 * p9_tag_cleanup - cleans up tags structure and reclaims resources 356 * @c: v9fs client struct 357 * 358 * This frees resources associated with the tags structure 359 * 360 */ 361 static void p9_tag_cleanup(struct p9_client *c) 362 { 363 int row, col; 364 365 /* check to insure all requests are idle */ 366 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 367 for (col = 0; col < P9_ROW_MAXTAG; col++) { 368 if (c->reqs[row][col].status != REQ_STATUS_IDLE) { 369 p9_debug(P9_DEBUG_MUX, 370 "Attempting to cleanup non-free tag %d,%d\n", 371 row, col); 372 /* TODO: delay execution of cleanup */ 373 return; 374 } 375 } 376 } 377 378 if (c->tagpool) { 379 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */ 380 p9_idpool_destroy(c->tagpool); 381 } 382 383 /* free requests associated with tags */ 384 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 385 for (col = 0; col < P9_ROW_MAXTAG; col++) { 386 kfree(c->reqs[row][col].wq); 387 kfree(c->reqs[row][col].tc); 388 kfree(c->reqs[row][col].rc); 389 } 390 kfree(c->reqs[row]); 391 } 392 c->max_tag = 0; 393 } 394 395 /** 396 * p9_free_req - free a request and clean-up as necessary 397 * c: client state 398 * r: request to release 399 * 400 */ 401 402 static void p9_free_req(struct p9_client *c, struct p9_req_t *r) 403 { 404 int tag = r->tc->tag; 405 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 406 407 r->status = REQ_STATUS_IDLE; 408 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) 409 p9_idpool_put(tag, c->tagpool); 410 } 411 412 /** 413 * p9_client_cb - call back from transport to client 414 * c: client state 415 * req: request received 416 * 417 */ 418 void p9_client_cb(struct p9_client *c, struct p9_req_t *req) 419 { 420 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); 421 wake_up(req->wq); 422 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); 423 } 424 EXPORT_SYMBOL(p9_client_cb); 425 426 /** 427 * p9_parse_header - parse header arguments out of a packet 428 * @pdu: packet to parse 429 * @size: size of packet 430 * @type: type of request 431 * @tag: tag of packet 432 * @rewind: set if we need to rewind offset afterwards 433 */ 434 435 int 436 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 437 int rewind) 438 { 439 int8_t r_type; 440 int16_t r_tag; 441 int32_t r_size; 442 int offset = pdu->offset; 443 int err; 444 445 pdu->offset = 0; 446 if (pdu->size == 0) 447 pdu->size = 7; 448 449 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 450 if (err) 451 goto rewind_and_exit; 452 453 pdu->size = r_size; 454 pdu->id = r_type; 455 pdu->tag = r_tag; 456 457 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 458 pdu->size, pdu->id, pdu->tag); 459 460 if (type) 461 *type = r_type; 462 if (tag) 463 *tag = r_tag; 464 if (size) 465 *size = r_size; 466 467 468 rewind_and_exit: 469 if (rewind) 470 pdu->offset = offset; 471 return err; 472 } 473 EXPORT_SYMBOL(p9_parse_header); 474 475 /** 476 * p9_check_errors - check 9p packet for error return and process it 477 * @c: current client instance 478 * @req: request to parse and check for error conditions 479 * 480 * returns error code if one is discovered, otherwise returns 0 481 * 482 * this will have to be more complicated if we have multiple 483 * error packet types 484 */ 485 486 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 487 { 488 int8_t type; 489 int err; 490 int ecode; 491 492 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 493 /* 494 * dump the response from server 495 * This should be after check errors which poplulate pdu_fcall. 496 */ 497 trace_9p_protocol_dump(c, req->rc); 498 if (err) { 499 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 500 return err; 501 } 502 if (type != P9_RERROR && type != P9_RLERROR) 503 return 0; 504 505 if (!p9_is_proto_dotl(c)) { 506 char *ename; 507 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 508 &ename, &ecode); 509 if (err) 510 goto out_err; 511 512 if (p9_is_proto_dotu(c)) 513 err = -ecode; 514 515 if (!err || !IS_ERR_VALUE(err)) { 516 err = p9_errstr2errno(ename, strlen(ename)); 517 518 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 519 -ecode, ename); 520 } 521 kfree(ename); 522 } else { 523 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 524 err = -ecode; 525 526 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 527 } 528 529 return err; 530 531 out_err: 532 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 533 534 return err; 535 } 536 537 /** 538 * p9_check_zc_errors - check 9p packet for error return and process it 539 * @c: current client instance 540 * @req: request to parse and check for error conditions 541 * @in_hdrlen: Size of response protocol buffer. 542 * 543 * returns error code if one is discovered, otherwise returns 0 544 * 545 * this will have to be more complicated if we have multiple 546 * error packet types 547 */ 548 549 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 550 char *uidata, int in_hdrlen, int kern_buf) 551 { 552 int err; 553 int ecode; 554 int8_t type; 555 char *ename = NULL; 556 557 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 558 /* 559 * dump the response from server 560 * This should be after parse_header which poplulate pdu_fcall. 561 */ 562 trace_9p_protocol_dump(c, req->rc); 563 if (err) { 564 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 565 return err; 566 } 567 568 if (type != P9_RERROR && type != P9_RLERROR) 569 return 0; 570 571 if (!p9_is_proto_dotl(c)) { 572 /* Error is reported in string format */ 573 int len; 574 /* 7 = header size for RERROR; */ 575 int inline_len = in_hdrlen - 7; 576 577 len = req->rc->size - req->rc->offset; 578 if (len > (P9_ZC_HDR_SZ - 7)) { 579 err = -EFAULT; 580 goto out_err; 581 } 582 583 ename = &req->rc->sdata[req->rc->offset]; 584 if (len > inline_len) { 585 /* We have error in external buffer */ 586 if (kern_buf) { 587 memcpy(ename + inline_len, uidata, 588 len - inline_len); 589 } else { 590 err = copy_from_user(ename + inline_len, 591 uidata, len - inline_len); 592 if (err) { 593 err = -EFAULT; 594 goto out_err; 595 } 596 } 597 } 598 ename = NULL; 599 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 600 &ename, &ecode); 601 if (err) 602 goto out_err; 603 604 if (p9_is_proto_dotu(c)) 605 err = -ecode; 606 607 if (!err || !IS_ERR_VALUE(err)) { 608 err = p9_errstr2errno(ename, strlen(ename)); 609 610 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 611 -ecode, ename); 612 } 613 kfree(ename); 614 } else { 615 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 616 err = -ecode; 617 618 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 619 } 620 return err; 621 622 out_err: 623 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 624 return err; 625 } 626 627 static struct p9_req_t * 628 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 629 630 /** 631 * p9_client_flush - flush (cancel) a request 632 * @c: client state 633 * @oldreq: request to cancel 634 * 635 * This sents a flush for a particular request and links 636 * the flush request to the original request. The current 637 * code only supports a single flush request although the protocol 638 * allows for multiple flush requests to be sent for a single request. 639 * 640 */ 641 642 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 643 { 644 struct p9_req_t *req; 645 int16_t oldtag; 646 int err; 647 648 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 649 if (err) 650 return err; 651 652 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 653 654 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 655 if (IS_ERR(req)) 656 return PTR_ERR(req); 657 658 659 /* 660 * if we haven't received a response for oldreq, 661 * remove it from the list 662 */ 663 if (oldreq->status == REQ_STATUS_FLSH) { 664 spin_lock(&c->lock); 665 list_del(&oldreq->req_list); 666 spin_unlock(&c->lock); 667 } 668 669 p9_free_req(c, req); 670 return 0; 671 } 672 673 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 674 int8_t type, int req_size, 675 const char *fmt, va_list ap) 676 { 677 int tag, err; 678 struct p9_req_t *req; 679 680 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 681 682 /* we allow for any status other than disconnected */ 683 if (c->status == Disconnected) 684 return ERR_PTR(-EIO); 685 686 /* if status is begin_disconnected we allow only clunk request */ 687 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 688 return ERR_PTR(-EIO); 689 690 tag = P9_NOTAG; 691 if (type != P9_TVERSION) { 692 tag = p9_idpool_get(c->tagpool); 693 if (tag < 0) 694 return ERR_PTR(-ENOMEM); 695 } 696 697 req = p9_tag_alloc(c, tag, req_size); 698 if (IS_ERR(req)) 699 return req; 700 701 /* marshall the data */ 702 p9pdu_prepare(req->tc, tag, type); 703 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 704 if (err) 705 goto reterr; 706 p9pdu_finalize(c, req->tc); 707 trace_9p_client_req(c, type, tag); 708 return req; 709 reterr: 710 p9_free_req(c, req); 711 return ERR_PTR(err); 712 } 713 714 /** 715 * p9_client_rpc - issue a request and wait for a response 716 * @c: client session 717 * @type: type of request 718 * @fmt: protocol format string (see protocol.c) 719 * 720 * Returns request structure (which client must free using p9_free_req) 721 */ 722 723 static struct p9_req_t * 724 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 725 { 726 va_list ap; 727 int sigpending, err; 728 unsigned long flags; 729 struct p9_req_t *req; 730 731 va_start(ap, fmt); 732 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 733 va_end(ap); 734 if (IS_ERR(req)) 735 return req; 736 737 if (signal_pending(current)) { 738 sigpending = 1; 739 clear_thread_flag(TIF_SIGPENDING); 740 } else 741 sigpending = 0; 742 743 err = c->trans_mod->request(c, req); 744 if (err < 0) { 745 if (err != -ERESTARTSYS && err != -EFAULT) 746 c->status = Disconnected; 747 goto reterr; 748 } 749 again: 750 /* Wait for the response */ 751 err = wait_event_interruptible(*req->wq, 752 req->status >= REQ_STATUS_RCVD); 753 754 if ((err == -ERESTARTSYS) && (c->status == Connected) 755 && (type == P9_TFLUSH)) { 756 sigpending = 1; 757 clear_thread_flag(TIF_SIGPENDING); 758 goto again; 759 } 760 761 if (req->status == REQ_STATUS_ERROR) { 762 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 763 err = req->t_err; 764 } 765 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 766 p9_debug(P9_DEBUG_MUX, "flushing\n"); 767 sigpending = 1; 768 clear_thread_flag(TIF_SIGPENDING); 769 770 if (c->trans_mod->cancel(c, req)) 771 p9_client_flush(c, req); 772 773 /* if we received the response anyway, don't signal error */ 774 if (req->status == REQ_STATUS_RCVD) 775 err = 0; 776 } 777 if (sigpending) { 778 spin_lock_irqsave(¤t->sighand->siglock, flags); 779 recalc_sigpending(); 780 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 781 } 782 if (err < 0) 783 goto reterr; 784 785 err = p9_check_errors(c, req); 786 trace_9p_client_res(c, type, req->rc->tag, err); 787 if (!err) 788 return req; 789 reterr: 790 p9_free_req(c, req); 791 return ERR_PTR(safe_errno(err)); 792 } 793 794 /** 795 * p9_client_zc_rpc - issue a request and wait for a response 796 * @c: client session 797 * @type: type of request 798 * @uidata: user bffer that should be ued for zero copy read 799 * @uodata: user buffer that shoud be user for zero copy write 800 * @inlen: read buffer size 801 * @olen: write buffer size 802 * @hdrlen: reader header size, This is the size of response protocol data 803 * @fmt: protocol format string (see protocol.c) 804 * 805 * Returns request structure (which client must free using p9_free_req) 806 */ 807 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 808 char *uidata, char *uodata, 809 int inlen, int olen, int in_hdrlen, 810 int kern_buf, const char *fmt, ...) 811 { 812 va_list ap; 813 int sigpending, err; 814 unsigned long flags; 815 struct p9_req_t *req; 816 817 va_start(ap, fmt); 818 /* 819 * We allocate a inline protocol data of only 4k bytes. 820 * The actual content is passed in zero-copy fashion. 821 */ 822 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 823 va_end(ap); 824 if (IS_ERR(req)) 825 return req; 826 827 if (signal_pending(current)) { 828 sigpending = 1; 829 clear_thread_flag(TIF_SIGPENDING); 830 } else 831 sigpending = 0; 832 833 /* If we are called with KERNEL_DS force kern_buf */ 834 if (segment_eq(get_fs(), KERNEL_DS)) 835 kern_buf = 1; 836 837 err = c->trans_mod->zc_request(c, req, uidata, uodata, 838 inlen, olen, in_hdrlen, kern_buf); 839 if (err < 0) { 840 if (err == -EIO) 841 c->status = Disconnected; 842 goto reterr; 843 } 844 if (req->status == REQ_STATUS_ERROR) { 845 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 846 err = req->t_err; 847 } 848 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 849 p9_debug(P9_DEBUG_MUX, "flushing\n"); 850 sigpending = 1; 851 clear_thread_flag(TIF_SIGPENDING); 852 853 if (c->trans_mod->cancel(c, req)) 854 p9_client_flush(c, req); 855 856 /* if we received the response anyway, don't signal error */ 857 if (req->status == REQ_STATUS_RCVD) 858 err = 0; 859 } 860 if (sigpending) { 861 spin_lock_irqsave(¤t->sighand->siglock, flags); 862 recalc_sigpending(); 863 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 864 } 865 if (err < 0) 866 goto reterr; 867 868 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf); 869 trace_9p_client_res(c, type, req->rc->tag, err); 870 if (!err) 871 return req; 872 reterr: 873 p9_free_req(c, req); 874 return ERR_PTR(safe_errno(err)); 875 } 876 877 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 878 { 879 int ret; 880 struct p9_fid *fid; 881 unsigned long flags; 882 883 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 884 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 885 if (!fid) 886 return ERR_PTR(-ENOMEM); 887 888 ret = p9_idpool_get(clnt->fidpool); 889 if (ret < 0) { 890 ret = -ENOSPC; 891 goto error; 892 } 893 fid->fid = ret; 894 895 memset(&fid->qid, 0, sizeof(struct p9_qid)); 896 fid->mode = -1; 897 fid->uid = current_fsuid(); 898 fid->clnt = clnt; 899 fid->rdir = NULL; 900 spin_lock_irqsave(&clnt->lock, flags); 901 list_add(&fid->flist, &clnt->fidlist); 902 spin_unlock_irqrestore(&clnt->lock, flags); 903 904 return fid; 905 906 error: 907 kfree(fid); 908 return ERR_PTR(ret); 909 } 910 911 static void p9_fid_destroy(struct p9_fid *fid) 912 { 913 struct p9_client *clnt; 914 unsigned long flags; 915 916 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 917 clnt = fid->clnt; 918 p9_idpool_put(fid->fid, clnt->fidpool); 919 spin_lock_irqsave(&clnt->lock, flags); 920 list_del(&fid->flist); 921 spin_unlock_irqrestore(&clnt->lock, flags); 922 kfree(fid->rdir); 923 kfree(fid); 924 } 925 926 static int p9_client_version(struct p9_client *c) 927 { 928 int err = 0; 929 struct p9_req_t *req; 930 char *version; 931 int msize; 932 933 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 934 c->msize, c->proto_version); 935 936 switch (c->proto_version) { 937 case p9_proto_2000L: 938 req = p9_client_rpc(c, P9_TVERSION, "ds", 939 c->msize, "9P2000.L"); 940 break; 941 case p9_proto_2000u: 942 req = p9_client_rpc(c, P9_TVERSION, "ds", 943 c->msize, "9P2000.u"); 944 break; 945 case p9_proto_legacy: 946 req = p9_client_rpc(c, P9_TVERSION, "ds", 947 c->msize, "9P2000"); 948 break; 949 default: 950 return -EINVAL; 951 break; 952 } 953 954 if (IS_ERR(req)) 955 return PTR_ERR(req); 956 957 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 958 if (err) { 959 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 960 trace_9p_protocol_dump(c, req->rc); 961 goto error; 962 } 963 964 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 965 if (!strncmp(version, "9P2000.L", 8)) 966 c->proto_version = p9_proto_2000L; 967 else if (!strncmp(version, "9P2000.u", 8)) 968 c->proto_version = p9_proto_2000u; 969 else if (!strncmp(version, "9P2000", 6)) 970 c->proto_version = p9_proto_legacy; 971 else { 972 err = -EREMOTEIO; 973 goto error; 974 } 975 976 if (msize < c->msize) 977 c->msize = msize; 978 979 error: 980 kfree(version); 981 p9_free_req(c, req); 982 983 return err; 984 } 985 986 struct p9_client *p9_client_create(const char *dev_name, char *options) 987 { 988 int err; 989 struct p9_client *clnt; 990 991 err = 0; 992 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 993 if (!clnt) 994 return ERR_PTR(-ENOMEM); 995 996 clnt->trans_mod = NULL; 997 clnt->trans = NULL; 998 spin_lock_init(&clnt->lock); 999 INIT_LIST_HEAD(&clnt->fidlist); 1000 1001 err = p9_tag_init(clnt); 1002 if (err < 0) 1003 goto free_client; 1004 1005 err = parse_opts(options, clnt); 1006 if (err < 0) 1007 goto destroy_tagpool; 1008 1009 if (!clnt->trans_mod) 1010 clnt->trans_mod = v9fs_get_trans_by_name("virtio"); 1011 1012 if (!clnt->trans_mod) 1013 clnt->trans_mod = v9fs_get_default_trans(); 1014 1015 if (clnt->trans_mod == NULL) { 1016 err = -EPROTONOSUPPORT; 1017 p9_debug(P9_DEBUG_ERROR, 1018 "No transport defined or default transport\n"); 1019 goto destroy_tagpool; 1020 } 1021 1022 clnt->fidpool = p9_idpool_create(); 1023 if (IS_ERR(clnt->fidpool)) { 1024 err = PTR_ERR(clnt->fidpool); 1025 goto put_trans; 1026 } 1027 1028 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1029 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1030 1031 err = clnt->trans_mod->create(clnt, dev_name, options); 1032 if (err) 1033 goto destroy_fidpool; 1034 1035 if (clnt->msize > clnt->trans_mod->maxsize) 1036 clnt->msize = clnt->trans_mod->maxsize; 1037 1038 err = p9_client_version(clnt); 1039 if (err) 1040 goto close_trans; 1041 1042 return clnt; 1043 1044 close_trans: 1045 clnt->trans_mod->close(clnt); 1046 destroy_fidpool: 1047 p9_idpool_destroy(clnt->fidpool); 1048 put_trans: 1049 v9fs_put_trans(clnt->trans_mod); 1050 destroy_tagpool: 1051 p9_idpool_destroy(clnt->tagpool); 1052 free_client: 1053 kfree(clnt); 1054 return ERR_PTR(err); 1055 } 1056 EXPORT_SYMBOL(p9_client_create); 1057 1058 void p9_client_destroy(struct p9_client *clnt) 1059 { 1060 struct p9_fid *fid, *fidptr; 1061 1062 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1063 1064 if (clnt->trans_mod) 1065 clnt->trans_mod->close(clnt); 1066 1067 v9fs_put_trans(clnt->trans_mod); 1068 1069 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { 1070 pr_info("Found fid %d not clunked\n", fid->fid); 1071 p9_fid_destroy(fid); 1072 } 1073 1074 if (clnt->fidpool) 1075 p9_idpool_destroy(clnt->fidpool); 1076 1077 p9_tag_cleanup(clnt); 1078 1079 kfree(clnt); 1080 } 1081 EXPORT_SYMBOL(p9_client_destroy); 1082 1083 void p9_client_disconnect(struct p9_client *clnt) 1084 { 1085 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1086 clnt->status = Disconnected; 1087 } 1088 EXPORT_SYMBOL(p9_client_disconnect); 1089 1090 void p9_client_begin_disconnect(struct p9_client *clnt) 1091 { 1092 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1093 clnt->status = BeginDisconnect; 1094 } 1095 EXPORT_SYMBOL(p9_client_begin_disconnect); 1096 1097 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1098 char *uname, kuid_t n_uname, char *aname) 1099 { 1100 int err = 0; 1101 struct p9_req_t *req; 1102 struct p9_fid *fid; 1103 struct p9_qid qid; 1104 1105 1106 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1107 afid ? afid->fid : -1, uname, aname); 1108 fid = p9_fid_create(clnt); 1109 if (IS_ERR(fid)) { 1110 err = PTR_ERR(fid); 1111 fid = NULL; 1112 goto error; 1113 } 1114 1115 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1116 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1117 if (IS_ERR(req)) { 1118 err = PTR_ERR(req); 1119 goto error; 1120 } 1121 1122 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 1123 if (err) { 1124 trace_9p_protocol_dump(clnt, req->rc); 1125 p9_free_req(clnt, req); 1126 goto error; 1127 } 1128 1129 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1130 qid.type, (unsigned long long)qid.path, qid.version); 1131 1132 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1133 1134 p9_free_req(clnt, req); 1135 return fid; 1136 1137 error: 1138 if (fid) 1139 p9_fid_destroy(fid); 1140 return ERR_PTR(err); 1141 } 1142 EXPORT_SYMBOL(p9_client_attach); 1143 1144 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1145 char **wnames, int clone) 1146 { 1147 int err; 1148 struct p9_client *clnt; 1149 struct p9_fid *fid; 1150 struct p9_qid *wqids; 1151 struct p9_req_t *req; 1152 uint16_t nwqids, count; 1153 1154 err = 0; 1155 wqids = NULL; 1156 clnt = oldfid->clnt; 1157 if (clone) { 1158 fid = p9_fid_create(clnt); 1159 if (IS_ERR(fid)) { 1160 err = PTR_ERR(fid); 1161 fid = NULL; 1162 goto error; 1163 } 1164 1165 fid->uid = oldfid->uid; 1166 } else 1167 fid = oldfid; 1168 1169 1170 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1171 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1172 1173 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1174 nwname, wnames); 1175 if (IS_ERR(req)) { 1176 err = PTR_ERR(req); 1177 goto error; 1178 } 1179 1180 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1181 if (err) { 1182 trace_9p_protocol_dump(clnt, req->rc); 1183 p9_free_req(clnt, req); 1184 goto clunk_fid; 1185 } 1186 p9_free_req(clnt, req); 1187 1188 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1189 1190 if (nwqids != nwname) { 1191 err = -ENOENT; 1192 goto clunk_fid; 1193 } 1194 1195 for (count = 0; count < nwqids; count++) 1196 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1197 count, wqids[count].type, 1198 (unsigned long long)wqids[count].path, 1199 wqids[count].version); 1200 1201 if (nwname) 1202 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1203 else 1204 fid->qid = oldfid->qid; 1205 1206 kfree(wqids); 1207 return fid; 1208 1209 clunk_fid: 1210 kfree(wqids); 1211 p9_client_clunk(fid); 1212 fid = NULL; 1213 1214 error: 1215 if (fid && (fid != oldfid)) 1216 p9_fid_destroy(fid); 1217 1218 return ERR_PTR(err); 1219 } 1220 EXPORT_SYMBOL(p9_client_walk); 1221 1222 int p9_client_open(struct p9_fid *fid, int mode) 1223 { 1224 int err; 1225 struct p9_client *clnt; 1226 struct p9_req_t *req; 1227 struct p9_qid qid; 1228 int iounit; 1229 1230 clnt = fid->clnt; 1231 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1232 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1233 err = 0; 1234 1235 if (fid->mode != -1) 1236 return -EINVAL; 1237 1238 if (p9_is_proto_dotl(clnt)) 1239 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1240 else 1241 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1242 if (IS_ERR(req)) { 1243 err = PTR_ERR(req); 1244 goto error; 1245 } 1246 1247 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1248 if (err) { 1249 trace_9p_protocol_dump(clnt, req->rc); 1250 goto free_and_error; 1251 } 1252 1253 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1254 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1255 (unsigned long long)qid.path, qid.version, iounit); 1256 1257 fid->mode = mode; 1258 fid->iounit = iounit; 1259 1260 free_and_error: 1261 p9_free_req(clnt, req); 1262 error: 1263 return err; 1264 } 1265 EXPORT_SYMBOL(p9_client_open); 1266 1267 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode, 1268 kgid_t gid, struct p9_qid *qid) 1269 { 1270 int err = 0; 1271 struct p9_client *clnt; 1272 struct p9_req_t *req; 1273 int iounit; 1274 1275 p9_debug(P9_DEBUG_9P, 1276 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1277 ofid->fid, name, flags, mode, 1278 from_kgid(&init_user_ns, gid)); 1279 clnt = ofid->clnt; 1280 1281 if (ofid->mode != -1) 1282 return -EINVAL; 1283 1284 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1285 mode, gid); 1286 if (IS_ERR(req)) { 1287 err = PTR_ERR(req); 1288 goto error; 1289 } 1290 1291 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1292 if (err) { 1293 trace_9p_protocol_dump(clnt, req->rc); 1294 goto free_and_error; 1295 } 1296 1297 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1298 qid->type, 1299 (unsigned long long)qid->path, 1300 qid->version, iounit); 1301 1302 ofid->mode = mode; 1303 ofid->iounit = iounit; 1304 1305 free_and_error: 1306 p9_free_req(clnt, req); 1307 error: 1308 return err; 1309 } 1310 EXPORT_SYMBOL(p9_client_create_dotl); 1311 1312 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, 1313 char *extension) 1314 { 1315 int err; 1316 struct p9_client *clnt; 1317 struct p9_req_t *req; 1318 struct p9_qid qid; 1319 int iounit; 1320 1321 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1322 fid->fid, name, perm, mode); 1323 err = 0; 1324 clnt = fid->clnt; 1325 1326 if (fid->mode != -1) 1327 return -EINVAL; 1328 1329 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1330 mode, extension); 1331 if (IS_ERR(req)) { 1332 err = PTR_ERR(req); 1333 goto error; 1334 } 1335 1336 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1337 if (err) { 1338 trace_9p_protocol_dump(clnt, req->rc); 1339 goto free_and_error; 1340 } 1341 1342 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1343 qid.type, 1344 (unsigned long long)qid.path, 1345 qid.version, iounit); 1346 1347 fid->mode = mode; 1348 fid->iounit = iounit; 1349 1350 free_and_error: 1351 p9_free_req(clnt, req); 1352 error: 1353 return err; 1354 } 1355 EXPORT_SYMBOL(p9_client_fcreate); 1356 1357 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid, 1358 struct p9_qid *qid) 1359 { 1360 int err = 0; 1361 struct p9_client *clnt; 1362 struct p9_req_t *req; 1363 1364 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1365 dfid->fid, name, symtgt); 1366 clnt = dfid->clnt; 1367 1368 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1369 gid); 1370 if (IS_ERR(req)) { 1371 err = PTR_ERR(req); 1372 goto error; 1373 } 1374 1375 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1376 if (err) { 1377 trace_9p_protocol_dump(clnt, req->rc); 1378 goto free_and_error; 1379 } 1380 1381 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1382 qid->type, (unsigned long long)qid->path, qid->version); 1383 1384 free_and_error: 1385 p9_free_req(clnt, req); 1386 error: 1387 return err; 1388 } 1389 EXPORT_SYMBOL(p9_client_symlink); 1390 1391 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname) 1392 { 1393 struct p9_client *clnt; 1394 struct p9_req_t *req; 1395 1396 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1397 dfid->fid, oldfid->fid, newname); 1398 clnt = dfid->clnt; 1399 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1400 newname); 1401 if (IS_ERR(req)) 1402 return PTR_ERR(req); 1403 1404 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1405 p9_free_req(clnt, req); 1406 return 0; 1407 } 1408 EXPORT_SYMBOL(p9_client_link); 1409 1410 int p9_client_fsync(struct p9_fid *fid, int datasync) 1411 { 1412 int err; 1413 struct p9_client *clnt; 1414 struct p9_req_t *req; 1415 1416 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1417 fid->fid, datasync); 1418 err = 0; 1419 clnt = fid->clnt; 1420 1421 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1422 if (IS_ERR(req)) { 1423 err = PTR_ERR(req); 1424 goto error; 1425 } 1426 1427 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1428 1429 p9_free_req(clnt, req); 1430 1431 error: 1432 return err; 1433 } 1434 EXPORT_SYMBOL(p9_client_fsync); 1435 1436 int p9_client_clunk(struct p9_fid *fid) 1437 { 1438 int err; 1439 struct p9_client *clnt; 1440 struct p9_req_t *req; 1441 int retries = 0; 1442 1443 if (!fid) { 1444 pr_warn("%s (%d): Trying to clunk with NULL fid\n", 1445 __func__, task_pid_nr(current)); 1446 dump_stack(); 1447 return 0; 1448 } 1449 1450 again: 1451 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1452 retries); 1453 err = 0; 1454 clnt = fid->clnt; 1455 1456 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1457 if (IS_ERR(req)) { 1458 err = PTR_ERR(req); 1459 goto error; 1460 } 1461 1462 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1463 1464 p9_free_req(clnt, req); 1465 error: 1466 /* 1467 * Fid is not valid even after a failed clunk 1468 * If interrupted, retry once then give up and 1469 * leak fid until umount. 1470 */ 1471 if (err == -ERESTARTSYS) { 1472 if (retries++ == 0) 1473 goto again; 1474 } else 1475 p9_fid_destroy(fid); 1476 return err; 1477 } 1478 EXPORT_SYMBOL(p9_client_clunk); 1479 1480 int p9_client_remove(struct p9_fid *fid) 1481 { 1482 int err; 1483 struct p9_client *clnt; 1484 struct p9_req_t *req; 1485 1486 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1487 err = 0; 1488 clnt = fid->clnt; 1489 1490 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1491 if (IS_ERR(req)) { 1492 err = PTR_ERR(req); 1493 goto error; 1494 } 1495 1496 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1497 1498 p9_free_req(clnt, req); 1499 error: 1500 if (err == -ERESTARTSYS) 1501 p9_client_clunk(fid); 1502 else 1503 p9_fid_destroy(fid); 1504 return err; 1505 } 1506 EXPORT_SYMBOL(p9_client_remove); 1507 1508 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1509 { 1510 int err = 0; 1511 struct p9_req_t *req; 1512 struct p9_client *clnt; 1513 1514 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1515 dfid->fid, name, flags); 1516 1517 clnt = dfid->clnt; 1518 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1519 if (IS_ERR(req)) { 1520 err = PTR_ERR(req); 1521 goto error; 1522 } 1523 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1524 1525 p9_free_req(clnt, req); 1526 error: 1527 return err; 1528 } 1529 EXPORT_SYMBOL(p9_client_unlinkat); 1530 1531 int 1532 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, 1533 u32 count) 1534 { 1535 char *dataptr; 1536 int kernel_buf = 0; 1537 struct p9_req_t *req; 1538 struct p9_client *clnt; 1539 int err, rsize, non_zc = 0; 1540 1541 1542 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1543 fid->fid, (unsigned long long) offset, count); 1544 err = 0; 1545 clnt = fid->clnt; 1546 1547 rsize = fid->iounit; 1548 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1549 rsize = clnt->msize - P9_IOHDRSZ; 1550 1551 if (count < rsize) 1552 rsize = count; 1553 1554 /* Don't bother zerocopy for small IO (< 1024) */ 1555 if (clnt->trans_mod->zc_request && rsize > 1024) { 1556 char *indata; 1557 if (data) { 1558 kernel_buf = 1; 1559 indata = data; 1560 } else 1561 indata = (__force char *)udata; 1562 /* 1563 * response header len is 11 1564 * PDU Header(7) + IO Size (4) 1565 */ 1566 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0, 1567 11, kernel_buf, "dqd", fid->fid, 1568 offset, rsize); 1569 } else { 1570 non_zc = 1; 1571 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1572 rsize); 1573 } 1574 if (IS_ERR(req)) { 1575 err = PTR_ERR(req); 1576 goto error; 1577 } 1578 1579 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1580 if (err) { 1581 trace_9p_protocol_dump(clnt, req->rc); 1582 goto free_and_error; 1583 } 1584 1585 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1586 1587 if (non_zc) { 1588 if (data) { 1589 memmove(data, dataptr, count); 1590 } else { 1591 err = copy_to_user(udata, dataptr, count); 1592 if (err) { 1593 err = -EFAULT; 1594 goto free_and_error; 1595 } 1596 } 1597 } 1598 p9_free_req(clnt, req); 1599 return count; 1600 1601 free_and_error: 1602 p9_free_req(clnt, req); 1603 error: 1604 return err; 1605 } 1606 EXPORT_SYMBOL(p9_client_read); 1607 1608 int 1609 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, 1610 u64 offset, u32 count) 1611 { 1612 int err, rsize; 1613 int kernel_buf = 0; 1614 struct p9_client *clnt; 1615 struct p9_req_t *req; 1616 1617 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", 1618 fid->fid, (unsigned long long) offset, count); 1619 err = 0; 1620 clnt = fid->clnt; 1621 1622 rsize = fid->iounit; 1623 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1624 rsize = clnt->msize - P9_IOHDRSZ; 1625 1626 if (count < rsize) 1627 rsize = count; 1628 1629 /* Don't bother zerocopy for small IO (< 1024) */ 1630 if (clnt->trans_mod->zc_request && rsize > 1024) { 1631 char *odata; 1632 if (data) { 1633 kernel_buf = 1; 1634 odata = data; 1635 } else 1636 odata = (char *)udata; 1637 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize, 1638 P9_ZC_HDR_SZ, kernel_buf, "dqd", 1639 fid->fid, offset, rsize); 1640 } else { 1641 if (data) 1642 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, 1643 offset, rsize, data); 1644 else 1645 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, 1646 offset, rsize, udata); 1647 } 1648 if (IS_ERR(req)) { 1649 err = PTR_ERR(req); 1650 goto error; 1651 } 1652 1653 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1654 if (err) { 1655 trace_9p_protocol_dump(clnt, req->rc); 1656 goto free_and_error; 1657 } 1658 1659 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1660 1661 p9_free_req(clnt, req); 1662 return count; 1663 1664 free_and_error: 1665 p9_free_req(clnt, req); 1666 error: 1667 return err; 1668 } 1669 EXPORT_SYMBOL(p9_client_write); 1670 1671 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1672 { 1673 int err; 1674 struct p9_client *clnt; 1675 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1676 struct p9_req_t *req; 1677 u16 ignored; 1678 1679 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1680 1681 if (!ret) 1682 return ERR_PTR(-ENOMEM); 1683 1684 err = 0; 1685 clnt = fid->clnt; 1686 1687 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1688 if (IS_ERR(req)) { 1689 err = PTR_ERR(req); 1690 goto error; 1691 } 1692 1693 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1694 if (err) { 1695 trace_9p_protocol_dump(clnt, req->rc); 1696 p9_free_req(clnt, req); 1697 goto error; 1698 } 1699 1700 p9_debug(P9_DEBUG_9P, 1701 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1702 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1703 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1704 "<<< uid=%d gid=%d n_muid=%d\n", 1705 ret->size, ret->type, ret->dev, ret->qid.type, 1706 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1707 ret->atime, ret->mtime, (unsigned long long)ret->length, 1708 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1709 from_kuid(&init_user_ns, ret->n_uid), 1710 from_kgid(&init_user_ns, ret->n_gid), 1711 from_kuid(&init_user_ns, ret->n_muid)); 1712 1713 p9_free_req(clnt, req); 1714 return ret; 1715 1716 error: 1717 kfree(ret); 1718 return ERR_PTR(err); 1719 } 1720 EXPORT_SYMBOL(p9_client_stat); 1721 1722 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1723 u64 request_mask) 1724 { 1725 int err; 1726 struct p9_client *clnt; 1727 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1728 GFP_KERNEL); 1729 struct p9_req_t *req; 1730 1731 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1732 fid->fid, request_mask); 1733 1734 if (!ret) 1735 return ERR_PTR(-ENOMEM); 1736 1737 err = 0; 1738 clnt = fid->clnt; 1739 1740 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1741 if (IS_ERR(req)) { 1742 err = PTR_ERR(req); 1743 goto error; 1744 } 1745 1746 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1747 if (err) { 1748 trace_9p_protocol_dump(clnt, req->rc); 1749 p9_free_req(clnt, req); 1750 goto error; 1751 } 1752 1753 p9_debug(P9_DEBUG_9P, 1754 "<<< RGETATTR st_result_mask=%lld\n" 1755 "<<< qid=%x.%llx.%x\n" 1756 "<<< st_mode=%8.8x st_nlink=%llu\n" 1757 "<<< st_uid=%d st_gid=%d\n" 1758 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1759 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1760 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1761 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1762 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1763 "<<< st_gen=%lld st_data_version=%lld", 1764 ret->st_result_mask, ret->qid.type, ret->qid.path, 1765 ret->qid.version, ret->st_mode, ret->st_nlink, 1766 from_kuid(&init_user_ns, ret->st_uid), 1767 from_kgid(&init_user_ns, ret->st_gid), 1768 ret->st_rdev, ret->st_size, ret->st_blksize, 1769 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1770 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1771 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1772 ret->st_gen, ret->st_data_version); 1773 1774 p9_free_req(clnt, req); 1775 return ret; 1776 1777 error: 1778 kfree(ret); 1779 return ERR_PTR(err); 1780 } 1781 EXPORT_SYMBOL(p9_client_getattr_dotl); 1782 1783 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1784 { 1785 int ret; 1786 1787 /* NOTE: size shouldn't include its own length */ 1788 /* size[2] type[2] dev[4] qid[13] */ 1789 /* mode[4] atime[4] mtime[4] length[8]*/ 1790 /* name[s] uid[s] gid[s] muid[s] */ 1791 ret = 2+4+13+4+4+4+8+2+2+2+2; 1792 1793 if (wst->name) 1794 ret += strlen(wst->name); 1795 if (wst->uid) 1796 ret += strlen(wst->uid); 1797 if (wst->gid) 1798 ret += strlen(wst->gid); 1799 if (wst->muid) 1800 ret += strlen(wst->muid); 1801 1802 if ((proto_version == p9_proto_2000u) || 1803 (proto_version == p9_proto_2000L)) { 1804 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1805 if (wst->extension) 1806 ret += strlen(wst->extension); 1807 } 1808 1809 return ret; 1810 } 1811 1812 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1813 { 1814 int err; 1815 struct p9_req_t *req; 1816 struct p9_client *clnt; 1817 1818 err = 0; 1819 clnt = fid->clnt; 1820 wst->size = p9_client_statsize(wst, clnt->proto_version); 1821 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1822 p9_debug(P9_DEBUG_9P, 1823 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1824 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1825 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1826 " uid=%d gid=%d n_muid=%d\n", 1827 wst->size, wst->type, wst->dev, wst->qid.type, 1828 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1829 wst->atime, wst->mtime, (unsigned long long)wst->length, 1830 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1831 from_kuid(&init_user_ns, wst->n_uid), 1832 from_kgid(&init_user_ns, wst->n_gid), 1833 from_kuid(&init_user_ns, wst->n_muid)); 1834 1835 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1836 if (IS_ERR(req)) { 1837 err = PTR_ERR(req); 1838 goto error; 1839 } 1840 1841 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1842 1843 p9_free_req(clnt, req); 1844 error: 1845 return err; 1846 } 1847 EXPORT_SYMBOL(p9_client_wstat); 1848 1849 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1850 { 1851 int err; 1852 struct p9_req_t *req; 1853 struct p9_client *clnt; 1854 1855 err = 0; 1856 clnt = fid->clnt; 1857 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1858 p9_debug(P9_DEBUG_9P, 1859 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1860 " atime_sec=%lld atime_nsec=%lld\n" 1861 " mtime_sec=%lld mtime_nsec=%lld\n", 1862 p9attr->valid, p9attr->mode, 1863 from_kuid(&init_user_ns, p9attr->uid), 1864 from_kgid(&init_user_ns, p9attr->gid), 1865 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1866 p9attr->mtime_sec, p9attr->mtime_nsec); 1867 1868 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1869 1870 if (IS_ERR(req)) { 1871 err = PTR_ERR(req); 1872 goto error; 1873 } 1874 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1875 p9_free_req(clnt, req); 1876 error: 1877 return err; 1878 } 1879 EXPORT_SYMBOL(p9_client_setattr); 1880 1881 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1882 { 1883 int err; 1884 struct p9_req_t *req; 1885 struct p9_client *clnt; 1886 1887 err = 0; 1888 clnt = fid->clnt; 1889 1890 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1891 1892 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1893 if (IS_ERR(req)) { 1894 err = PTR_ERR(req); 1895 goto error; 1896 } 1897 1898 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1899 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1900 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1901 if (err) { 1902 trace_9p_protocol_dump(clnt, req->rc); 1903 p9_free_req(clnt, req); 1904 goto error; 1905 } 1906 1907 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1908 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1909 "fsid %llu namelen %ld\n", 1910 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1911 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1912 sb->fsid, (long int)sb->namelen); 1913 1914 p9_free_req(clnt, req); 1915 error: 1916 return err; 1917 } 1918 EXPORT_SYMBOL(p9_client_statfs); 1919 1920 int p9_client_rename(struct p9_fid *fid, 1921 struct p9_fid *newdirfid, const char *name) 1922 { 1923 int err; 1924 struct p9_req_t *req; 1925 struct p9_client *clnt; 1926 1927 err = 0; 1928 clnt = fid->clnt; 1929 1930 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1931 fid->fid, newdirfid->fid, name); 1932 1933 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1934 newdirfid->fid, name); 1935 if (IS_ERR(req)) { 1936 err = PTR_ERR(req); 1937 goto error; 1938 } 1939 1940 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1941 1942 p9_free_req(clnt, req); 1943 error: 1944 return err; 1945 } 1946 EXPORT_SYMBOL(p9_client_rename); 1947 1948 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1949 struct p9_fid *newdirfid, const char *new_name) 1950 { 1951 int err; 1952 struct p9_req_t *req; 1953 struct p9_client *clnt; 1954 1955 err = 0; 1956 clnt = olddirfid->clnt; 1957 1958 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1959 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1960 newdirfid->fid, new_name); 1961 1962 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1963 old_name, newdirfid->fid, new_name); 1964 if (IS_ERR(req)) { 1965 err = PTR_ERR(req); 1966 goto error; 1967 } 1968 1969 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1970 newdirfid->fid, new_name); 1971 1972 p9_free_req(clnt, req); 1973 error: 1974 return err; 1975 } 1976 EXPORT_SYMBOL(p9_client_renameat); 1977 1978 /* 1979 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1980 */ 1981 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1982 const char *attr_name, u64 *attr_size) 1983 { 1984 int err; 1985 struct p9_req_t *req; 1986 struct p9_client *clnt; 1987 struct p9_fid *attr_fid; 1988 1989 err = 0; 1990 clnt = file_fid->clnt; 1991 attr_fid = p9_fid_create(clnt); 1992 if (IS_ERR(attr_fid)) { 1993 err = PTR_ERR(attr_fid); 1994 attr_fid = NULL; 1995 goto error; 1996 } 1997 p9_debug(P9_DEBUG_9P, 1998 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 1999 file_fid->fid, attr_fid->fid, attr_name); 2000 2001 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2002 file_fid->fid, attr_fid->fid, attr_name); 2003 if (IS_ERR(req)) { 2004 err = PTR_ERR(req); 2005 goto error; 2006 } 2007 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 2008 if (err) { 2009 trace_9p_protocol_dump(clnt, req->rc); 2010 p9_free_req(clnt, req); 2011 goto clunk_fid; 2012 } 2013 p9_free_req(clnt, req); 2014 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2015 attr_fid->fid, *attr_size); 2016 return attr_fid; 2017 clunk_fid: 2018 p9_client_clunk(attr_fid); 2019 attr_fid = NULL; 2020 error: 2021 if (attr_fid && (attr_fid != file_fid)) 2022 p9_fid_destroy(attr_fid); 2023 2024 return ERR_PTR(err); 2025 } 2026 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2027 2028 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2029 u64 attr_size, int flags) 2030 { 2031 int err; 2032 struct p9_req_t *req; 2033 struct p9_client *clnt; 2034 2035 p9_debug(P9_DEBUG_9P, 2036 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2037 fid->fid, name, (long long)attr_size, flags); 2038 err = 0; 2039 clnt = fid->clnt; 2040 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2041 fid->fid, name, attr_size, flags); 2042 if (IS_ERR(req)) { 2043 err = PTR_ERR(req); 2044 goto error; 2045 } 2046 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2047 p9_free_req(clnt, req); 2048 error: 2049 return err; 2050 } 2051 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2052 2053 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2054 { 2055 int err, rsize, non_zc = 0; 2056 struct p9_client *clnt; 2057 struct p9_req_t *req; 2058 char *dataptr; 2059 2060 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2061 fid->fid, (unsigned long long) offset, count); 2062 2063 err = 0; 2064 clnt = fid->clnt; 2065 2066 rsize = fid->iounit; 2067 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2068 rsize = clnt->msize - P9_READDIRHDRSZ; 2069 2070 if (count < rsize) 2071 rsize = count; 2072 2073 /* Don't bother zerocopy for small IO (< 1024) */ 2074 if (clnt->trans_mod->zc_request && rsize > 1024) { 2075 /* 2076 * response header len is 11 2077 * PDU Header(7) + IO Size (4) 2078 */ 2079 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0, 2080 11, 1, "dqd", fid->fid, offset, rsize); 2081 } else { 2082 non_zc = 1; 2083 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2084 offset, rsize); 2085 } 2086 if (IS_ERR(req)) { 2087 err = PTR_ERR(req); 2088 goto error; 2089 } 2090 2091 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 2092 if (err) { 2093 trace_9p_protocol_dump(clnt, req->rc); 2094 goto free_and_error; 2095 } 2096 2097 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2098 2099 if (non_zc) 2100 memmove(data, dataptr, count); 2101 2102 p9_free_req(clnt, req); 2103 return count; 2104 2105 free_and_error: 2106 p9_free_req(clnt, req); 2107 error: 2108 return err; 2109 } 2110 EXPORT_SYMBOL(p9_client_readdir); 2111 2112 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode, 2113 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2114 { 2115 int err; 2116 struct p9_client *clnt; 2117 struct p9_req_t *req; 2118 2119 err = 0; 2120 clnt = fid->clnt; 2121 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2122 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2123 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2124 MAJOR(rdev), MINOR(rdev), gid); 2125 if (IS_ERR(req)) 2126 return PTR_ERR(req); 2127 2128 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2129 if (err) { 2130 trace_9p_protocol_dump(clnt, req->rc); 2131 goto error; 2132 } 2133 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2134 (unsigned long long)qid->path, qid->version); 2135 2136 error: 2137 p9_free_req(clnt, req); 2138 return err; 2139 2140 } 2141 EXPORT_SYMBOL(p9_client_mknod_dotl); 2142 2143 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode, 2144 kgid_t gid, struct p9_qid *qid) 2145 { 2146 int err; 2147 struct p9_client *clnt; 2148 struct p9_req_t *req; 2149 2150 err = 0; 2151 clnt = fid->clnt; 2152 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2153 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2154 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2155 gid); 2156 if (IS_ERR(req)) 2157 return PTR_ERR(req); 2158 2159 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2160 if (err) { 2161 trace_9p_protocol_dump(clnt, req->rc); 2162 goto error; 2163 } 2164 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2165 (unsigned long long)qid->path, qid->version); 2166 2167 error: 2168 p9_free_req(clnt, req); 2169 return err; 2170 2171 } 2172 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2173 2174 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2175 { 2176 int err; 2177 struct p9_client *clnt; 2178 struct p9_req_t *req; 2179 2180 err = 0; 2181 clnt = fid->clnt; 2182 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2183 "start %lld length %lld proc_id %d client_id %s\n", 2184 fid->fid, flock->type, flock->flags, flock->start, 2185 flock->length, flock->proc_id, flock->client_id); 2186 2187 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2188 flock->flags, flock->start, flock->length, 2189 flock->proc_id, flock->client_id); 2190 2191 if (IS_ERR(req)) 2192 return PTR_ERR(req); 2193 2194 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); 2195 if (err) { 2196 trace_9p_protocol_dump(clnt, req->rc); 2197 goto error; 2198 } 2199 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2200 error: 2201 p9_free_req(clnt, req); 2202 return err; 2203 2204 } 2205 EXPORT_SYMBOL(p9_client_lock_dotl); 2206 2207 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2208 { 2209 int err; 2210 struct p9_client *clnt; 2211 struct p9_req_t *req; 2212 2213 err = 0; 2214 clnt = fid->clnt; 2215 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2216 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2217 glock->start, glock->length, glock->proc_id, glock->client_id); 2218 2219 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2220 glock->start, glock->length, glock->proc_id, glock->client_id); 2221 2222 if (IS_ERR(req)) 2223 return PTR_ERR(req); 2224 2225 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, 2226 &glock->start, &glock->length, &glock->proc_id, 2227 &glock->client_id); 2228 if (err) { 2229 trace_9p_protocol_dump(clnt, req->rc); 2230 goto error; 2231 } 2232 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2233 "proc_id %d client_id %s\n", glock->type, glock->start, 2234 glock->length, glock->proc_id, glock->client_id); 2235 error: 2236 p9_free_req(clnt, req); 2237 return err; 2238 } 2239 EXPORT_SYMBOL(p9_client_getlock_dotl); 2240 2241 int p9_client_readlink(struct p9_fid *fid, char **target) 2242 { 2243 int err; 2244 struct p9_client *clnt; 2245 struct p9_req_t *req; 2246 2247 err = 0; 2248 clnt = fid->clnt; 2249 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2250 2251 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2252 if (IS_ERR(req)) 2253 return PTR_ERR(req); 2254 2255 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); 2256 if (err) { 2257 trace_9p_protocol_dump(clnt, req->rc); 2258 goto error; 2259 } 2260 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2261 error: 2262 p9_free_req(clnt, req); 2263 return err; 2264 } 2265 EXPORT_SYMBOL(p9_client_readlink); 2266