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_2000u; 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 /** 208 * p9_tag_alloc - lookup/allocate a request by tag 209 * @c: client session to lookup tag within 210 * @tag: numeric id for transaction 211 * 212 * this is a simple array lookup, but will grow the 213 * request_slots as necessary to accommodate transaction 214 * ids which did not previously have a slot. 215 * 216 * this code relies on the client spinlock to manage locks, its 217 * possible we should switch to something else, but I'd rather 218 * stick with something low-overhead for the common case. 219 * 220 */ 221 222 static struct p9_req_t * 223 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size) 224 { 225 unsigned long flags; 226 int row, col; 227 struct p9_req_t *req; 228 int alloc_msize = min(c->msize, max_size); 229 230 /* This looks up the original request by tag so we know which 231 * buffer to read the data into */ 232 tag++; 233 234 if (tag >= c->max_tag) { 235 spin_lock_irqsave(&c->lock, flags); 236 /* check again since original check was outside of lock */ 237 while (tag >= c->max_tag) { 238 row = (tag / P9_ROW_MAXTAG); 239 c->reqs[row] = kcalloc(P9_ROW_MAXTAG, 240 sizeof(struct p9_req_t), GFP_ATOMIC); 241 242 if (!c->reqs[row]) { 243 pr_err("Couldn't grow tag array\n"); 244 spin_unlock_irqrestore(&c->lock, flags); 245 return ERR_PTR(-ENOMEM); 246 } 247 for (col = 0; col < P9_ROW_MAXTAG; col++) { 248 c->reqs[row][col].status = REQ_STATUS_IDLE; 249 c->reqs[row][col].tc = NULL; 250 } 251 c->max_tag += P9_ROW_MAXTAG; 252 } 253 spin_unlock_irqrestore(&c->lock, flags); 254 } 255 row = tag / P9_ROW_MAXTAG; 256 col = tag % P9_ROW_MAXTAG; 257 258 req = &c->reqs[row][col]; 259 if (!req->tc) { 260 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS); 261 if (!req->wq) { 262 pr_err("Couldn't grow tag array\n"); 263 return ERR_PTR(-ENOMEM); 264 } 265 init_waitqueue_head(req->wq); 266 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, 267 GFP_NOFS); 268 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, 269 GFP_NOFS); 270 if ((!req->tc) || (!req->rc)) { 271 pr_err("Couldn't grow tag array\n"); 272 kfree(req->tc); 273 kfree(req->rc); 274 kfree(req->wq); 275 req->tc = req->rc = NULL; 276 req->wq = NULL; 277 return ERR_PTR(-ENOMEM); 278 } 279 req->tc->capacity = alloc_msize; 280 req->rc->capacity = alloc_msize; 281 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall); 282 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall); 283 } 284 285 p9pdu_reset(req->tc); 286 p9pdu_reset(req->rc); 287 288 req->tc->tag = tag-1; 289 req->status = REQ_STATUS_ALLOC; 290 291 return &c->reqs[row][col]; 292 } 293 294 /** 295 * p9_tag_lookup - lookup a request by tag 296 * @c: client session to lookup tag within 297 * @tag: numeric id for transaction 298 * 299 */ 300 301 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 302 { 303 int row, col; 304 305 /* This looks up the original request by tag so we know which 306 * buffer to read the data into */ 307 tag++; 308 309 if(tag >= c->max_tag) 310 return NULL; 311 312 row = tag / P9_ROW_MAXTAG; 313 col = tag % P9_ROW_MAXTAG; 314 315 return &c->reqs[row][col]; 316 } 317 EXPORT_SYMBOL(p9_tag_lookup); 318 319 /** 320 * p9_tag_init - setup tags structure and contents 321 * @c: v9fs client struct 322 * 323 * This initializes the tags structure for each client instance. 324 * 325 */ 326 327 static int p9_tag_init(struct p9_client *c) 328 { 329 int err = 0; 330 331 c->tagpool = p9_idpool_create(); 332 if (IS_ERR(c->tagpool)) { 333 err = PTR_ERR(c->tagpool); 334 goto error; 335 } 336 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */ 337 if (err < 0) { 338 p9_idpool_destroy(c->tagpool); 339 goto error; 340 } 341 c->max_tag = 0; 342 error: 343 return err; 344 } 345 346 /** 347 * p9_tag_cleanup - cleans up tags structure and reclaims resources 348 * @c: v9fs client struct 349 * 350 * This frees resources associated with the tags structure 351 * 352 */ 353 static void p9_tag_cleanup(struct p9_client *c) 354 { 355 int row, col; 356 357 /* check to insure all requests are idle */ 358 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 359 for (col = 0; col < P9_ROW_MAXTAG; col++) { 360 if (c->reqs[row][col].status != REQ_STATUS_IDLE) { 361 p9_debug(P9_DEBUG_MUX, 362 "Attempting to cleanup non-free tag %d,%d\n", 363 row, col); 364 /* TODO: delay execution of cleanup */ 365 return; 366 } 367 } 368 } 369 370 if (c->tagpool) { 371 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */ 372 p9_idpool_destroy(c->tagpool); 373 } 374 375 /* free requests associated with tags */ 376 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 377 for (col = 0; col < P9_ROW_MAXTAG; col++) { 378 kfree(c->reqs[row][col].wq); 379 kfree(c->reqs[row][col].tc); 380 kfree(c->reqs[row][col].rc); 381 } 382 kfree(c->reqs[row]); 383 } 384 c->max_tag = 0; 385 } 386 387 /** 388 * p9_free_req - free a request and clean-up as necessary 389 * c: client state 390 * r: request to release 391 * 392 */ 393 394 static void p9_free_req(struct p9_client *c, struct p9_req_t *r) 395 { 396 int tag = r->tc->tag; 397 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 398 399 r->status = REQ_STATUS_IDLE; 400 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) 401 p9_idpool_put(tag, c->tagpool); 402 } 403 404 /** 405 * p9_client_cb - call back from transport to client 406 * c: client state 407 * req: request received 408 * 409 */ 410 void p9_client_cb(struct p9_client *c, struct p9_req_t *req) 411 { 412 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); 413 wake_up(req->wq); 414 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); 415 } 416 EXPORT_SYMBOL(p9_client_cb); 417 418 /** 419 * p9_parse_header - parse header arguments out of a packet 420 * @pdu: packet to parse 421 * @size: size of packet 422 * @type: type of request 423 * @tag: tag of packet 424 * @rewind: set if we need to rewind offset afterwards 425 */ 426 427 int 428 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 429 int rewind) 430 { 431 int8_t r_type; 432 int16_t r_tag; 433 int32_t r_size; 434 int offset = pdu->offset; 435 int err; 436 437 pdu->offset = 0; 438 if (pdu->size == 0) 439 pdu->size = 7; 440 441 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 442 if (err) 443 goto rewind_and_exit; 444 445 pdu->size = r_size; 446 pdu->id = r_type; 447 pdu->tag = r_tag; 448 449 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 450 pdu->size, pdu->id, pdu->tag); 451 452 if (type) 453 *type = r_type; 454 if (tag) 455 *tag = r_tag; 456 if (size) 457 *size = r_size; 458 459 460 rewind_and_exit: 461 if (rewind) 462 pdu->offset = offset; 463 return err; 464 } 465 EXPORT_SYMBOL(p9_parse_header); 466 467 /** 468 * p9_check_errors - check 9p packet for error return and process it 469 * @c: current client instance 470 * @req: request to parse and check for error conditions 471 * 472 * returns error code if one is discovered, otherwise returns 0 473 * 474 * this will have to be more complicated if we have multiple 475 * error packet types 476 */ 477 478 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 479 { 480 int8_t type; 481 int err; 482 int ecode; 483 484 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 485 /* 486 * dump the response from server 487 * This should be after check errors which poplulate pdu_fcall. 488 */ 489 trace_9p_protocol_dump(c, req->rc); 490 if (err) { 491 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 492 return err; 493 } 494 if (type != P9_RERROR && type != P9_RLERROR) 495 return 0; 496 497 if (!p9_is_proto_dotl(c)) { 498 char *ename; 499 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 500 &ename, &ecode); 501 if (err) 502 goto out_err; 503 504 if (p9_is_proto_dotu(c)) 505 err = -ecode; 506 507 if (!err || !IS_ERR_VALUE(err)) { 508 err = p9_errstr2errno(ename, strlen(ename)); 509 510 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 511 -ecode, ename); 512 } 513 kfree(ename); 514 } else { 515 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 516 err = -ecode; 517 518 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 519 } 520 521 return err; 522 523 out_err: 524 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 525 526 return err; 527 } 528 529 /** 530 * p9_check_zc_errors - check 9p packet for error return and process it 531 * @c: current client instance 532 * @req: request to parse and check for error conditions 533 * @in_hdrlen: Size of response protocol buffer. 534 * 535 * returns error code if one is discovered, otherwise returns 0 536 * 537 * this will have to be more complicated if we have multiple 538 * error packet types 539 */ 540 541 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 542 char *uidata, int in_hdrlen, int kern_buf) 543 { 544 int err; 545 int ecode; 546 int8_t type; 547 char *ename = NULL; 548 549 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 550 /* 551 * dump the response from server 552 * This should be after parse_header which poplulate pdu_fcall. 553 */ 554 trace_9p_protocol_dump(c, req->rc); 555 if (err) { 556 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 557 return err; 558 } 559 560 if (type != P9_RERROR && type != P9_RLERROR) 561 return 0; 562 563 if (!p9_is_proto_dotl(c)) { 564 /* Error is reported in string format */ 565 int len; 566 /* 7 = header size for RERROR; */ 567 int inline_len = in_hdrlen - 7; 568 569 len = req->rc->size - req->rc->offset; 570 if (len > (P9_ZC_HDR_SZ - 7)) { 571 err = -EFAULT; 572 goto out_err; 573 } 574 575 ename = &req->rc->sdata[req->rc->offset]; 576 if (len > inline_len) { 577 /* We have error in external buffer */ 578 if (kern_buf) { 579 memcpy(ename + inline_len, uidata, 580 len - inline_len); 581 } else { 582 err = copy_from_user(ename + inline_len, 583 uidata, len - inline_len); 584 if (err) { 585 err = -EFAULT; 586 goto out_err; 587 } 588 } 589 } 590 ename = NULL; 591 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 592 &ename, &ecode); 593 if (err) 594 goto out_err; 595 596 if (p9_is_proto_dotu(c)) 597 err = -ecode; 598 599 if (!err || !IS_ERR_VALUE(err)) { 600 err = p9_errstr2errno(ename, strlen(ename)); 601 602 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 603 -ecode, ename); 604 } 605 kfree(ename); 606 } else { 607 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 608 err = -ecode; 609 610 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 611 } 612 return err; 613 614 out_err: 615 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 616 return err; 617 } 618 619 static struct p9_req_t * 620 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 621 622 /** 623 * p9_client_flush - flush (cancel) a request 624 * @c: client state 625 * @oldreq: request to cancel 626 * 627 * This sents a flush for a particular request and links 628 * the flush request to the original request. The current 629 * code only supports a single flush request although the protocol 630 * allows for multiple flush requests to be sent for a single request. 631 * 632 */ 633 634 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 635 { 636 struct p9_req_t *req; 637 int16_t oldtag; 638 int err; 639 640 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 641 if (err) 642 return err; 643 644 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 645 646 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 647 if (IS_ERR(req)) 648 return PTR_ERR(req); 649 650 651 /* if we haven't received a response for oldreq, 652 remove it from the list. */ 653 spin_lock(&c->lock); 654 if (oldreq->status == REQ_STATUS_FLSH) 655 list_del(&oldreq->req_list); 656 spin_unlock(&c->lock); 657 658 p9_free_req(c, req); 659 return 0; 660 } 661 662 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 663 int8_t type, int req_size, 664 const char *fmt, va_list ap) 665 { 666 int tag, err; 667 struct p9_req_t *req; 668 669 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 670 671 /* we allow for any status other than disconnected */ 672 if (c->status == Disconnected) 673 return ERR_PTR(-EIO); 674 675 /* if status is begin_disconnected we allow only clunk request */ 676 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 677 return ERR_PTR(-EIO); 678 679 tag = P9_NOTAG; 680 if (type != P9_TVERSION) { 681 tag = p9_idpool_get(c->tagpool); 682 if (tag < 0) 683 return ERR_PTR(-ENOMEM); 684 } 685 686 req = p9_tag_alloc(c, tag, req_size); 687 if (IS_ERR(req)) 688 return req; 689 690 /* marshall the data */ 691 p9pdu_prepare(req->tc, tag, type); 692 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 693 if (err) 694 goto reterr; 695 p9pdu_finalize(c, req->tc); 696 trace_9p_client_req(c, type, tag); 697 return req; 698 reterr: 699 p9_free_req(c, req); 700 return ERR_PTR(err); 701 } 702 703 /** 704 * p9_client_rpc - issue a request and wait for a response 705 * @c: client session 706 * @type: type of request 707 * @fmt: protocol format string (see protocol.c) 708 * 709 * Returns request structure (which client must free using p9_free_req) 710 */ 711 712 static struct p9_req_t * 713 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 714 { 715 va_list ap; 716 int sigpending, err; 717 unsigned long flags; 718 struct p9_req_t *req; 719 720 va_start(ap, fmt); 721 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 722 va_end(ap); 723 if (IS_ERR(req)) 724 return req; 725 726 if (signal_pending(current)) { 727 sigpending = 1; 728 clear_thread_flag(TIF_SIGPENDING); 729 } else 730 sigpending = 0; 731 732 err = c->trans_mod->request(c, req); 733 if (err < 0) { 734 if (err != -ERESTARTSYS && err != -EFAULT) 735 c->status = Disconnected; 736 goto reterr; 737 } 738 again: 739 /* Wait for the response */ 740 err = wait_event_interruptible(*req->wq, 741 req->status >= REQ_STATUS_RCVD); 742 743 if ((err == -ERESTARTSYS) && (c->status == Connected) 744 && (type == P9_TFLUSH)) { 745 sigpending = 1; 746 clear_thread_flag(TIF_SIGPENDING); 747 goto again; 748 } 749 750 if (req->status == REQ_STATUS_ERROR) { 751 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 752 err = req->t_err; 753 } 754 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 755 p9_debug(P9_DEBUG_MUX, "flushing\n"); 756 sigpending = 1; 757 clear_thread_flag(TIF_SIGPENDING); 758 759 if (c->trans_mod->cancel(c, req)) 760 p9_client_flush(c, req); 761 762 /* if we received the response anyway, don't signal error */ 763 if (req->status == REQ_STATUS_RCVD) 764 err = 0; 765 } 766 if (sigpending) { 767 spin_lock_irqsave(¤t->sighand->siglock, flags); 768 recalc_sigpending(); 769 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 770 } 771 if (err < 0) 772 goto reterr; 773 774 err = p9_check_errors(c, req); 775 trace_9p_client_res(c, type, req->rc->tag, err); 776 if (!err) 777 return req; 778 reterr: 779 p9_free_req(c, req); 780 return ERR_PTR(safe_errno(err)); 781 } 782 783 /** 784 * p9_client_zc_rpc - issue a request and wait for a response 785 * @c: client session 786 * @type: type of request 787 * @uidata: user bffer that should be ued for zero copy read 788 * @uodata: user buffer that shoud be user for zero copy write 789 * @inlen: read buffer size 790 * @olen: write buffer size 791 * @hdrlen: reader header size, This is the size of response protocol data 792 * @fmt: protocol format string (see protocol.c) 793 * 794 * Returns request structure (which client must free using p9_free_req) 795 */ 796 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 797 char *uidata, char *uodata, 798 int inlen, int olen, int in_hdrlen, 799 int kern_buf, const char *fmt, ...) 800 { 801 va_list ap; 802 int sigpending, err; 803 unsigned long flags; 804 struct p9_req_t *req; 805 806 va_start(ap, fmt); 807 /* 808 * We allocate a inline protocol data of only 4k bytes. 809 * The actual content is passed in zero-copy fashion. 810 */ 811 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 812 va_end(ap); 813 if (IS_ERR(req)) 814 return req; 815 816 if (signal_pending(current)) { 817 sigpending = 1; 818 clear_thread_flag(TIF_SIGPENDING); 819 } else 820 sigpending = 0; 821 822 /* If we are called with KERNEL_DS force kern_buf */ 823 if (segment_eq(get_fs(), KERNEL_DS)) 824 kern_buf = 1; 825 826 err = c->trans_mod->zc_request(c, req, uidata, uodata, 827 inlen, olen, in_hdrlen, kern_buf); 828 if (err < 0) { 829 if (err == -EIO) 830 c->status = Disconnected; 831 goto reterr; 832 } 833 if (req->status == REQ_STATUS_ERROR) { 834 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 835 err = req->t_err; 836 } 837 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 838 p9_debug(P9_DEBUG_MUX, "flushing\n"); 839 sigpending = 1; 840 clear_thread_flag(TIF_SIGPENDING); 841 842 if (c->trans_mod->cancel(c, req)) 843 p9_client_flush(c, req); 844 845 /* if we received the response anyway, don't signal error */ 846 if (req->status == REQ_STATUS_RCVD) 847 err = 0; 848 } 849 if (sigpending) { 850 spin_lock_irqsave(¤t->sighand->siglock, flags); 851 recalc_sigpending(); 852 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 853 } 854 if (err < 0) 855 goto reterr; 856 857 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf); 858 trace_9p_client_res(c, type, req->rc->tag, err); 859 if (!err) 860 return req; 861 reterr: 862 p9_free_req(c, req); 863 return ERR_PTR(safe_errno(err)); 864 } 865 866 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 867 { 868 int ret; 869 struct p9_fid *fid; 870 unsigned long flags; 871 872 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 873 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 874 if (!fid) 875 return ERR_PTR(-ENOMEM); 876 877 ret = p9_idpool_get(clnt->fidpool); 878 if (ret < 0) { 879 ret = -ENOSPC; 880 goto error; 881 } 882 fid->fid = ret; 883 884 memset(&fid->qid, 0, sizeof(struct p9_qid)); 885 fid->mode = -1; 886 fid->uid = current_fsuid(); 887 fid->clnt = clnt; 888 fid->rdir = NULL; 889 spin_lock_irqsave(&clnt->lock, flags); 890 list_add(&fid->flist, &clnt->fidlist); 891 spin_unlock_irqrestore(&clnt->lock, flags); 892 893 return fid; 894 895 error: 896 kfree(fid); 897 return ERR_PTR(ret); 898 } 899 900 static void p9_fid_destroy(struct p9_fid *fid) 901 { 902 struct p9_client *clnt; 903 unsigned long flags; 904 905 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 906 clnt = fid->clnt; 907 p9_idpool_put(fid->fid, clnt->fidpool); 908 spin_lock_irqsave(&clnt->lock, flags); 909 list_del(&fid->flist); 910 spin_unlock_irqrestore(&clnt->lock, flags); 911 kfree(fid->rdir); 912 kfree(fid); 913 } 914 915 static int p9_client_version(struct p9_client *c) 916 { 917 int err = 0; 918 struct p9_req_t *req; 919 char *version; 920 int msize; 921 922 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 923 c->msize, c->proto_version); 924 925 switch (c->proto_version) { 926 case p9_proto_2000L: 927 req = p9_client_rpc(c, P9_TVERSION, "ds", 928 c->msize, "9P2000.L"); 929 break; 930 case p9_proto_2000u: 931 req = p9_client_rpc(c, P9_TVERSION, "ds", 932 c->msize, "9P2000.u"); 933 break; 934 case p9_proto_legacy: 935 req = p9_client_rpc(c, P9_TVERSION, "ds", 936 c->msize, "9P2000"); 937 break; 938 default: 939 return -EINVAL; 940 break; 941 } 942 943 if (IS_ERR(req)) 944 return PTR_ERR(req); 945 946 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 947 if (err) { 948 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 949 trace_9p_protocol_dump(c, req->rc); 950 goto error; 951 } 952 953 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 954 if (!strncmp(version, "9P2000.L", 8)) 955 c->proto_version = p9_proto_2000L; 956 else if (!strncmp(version, "9P2000.u", 8)) 957 c->proto_version = p9_proto_2000u; 958 else if (!strncmp(version, "9P2000", 6)) 959 c->proto_version = p9_proto_legacy; 960 else { 961 err = -EREMOTEIO; 962 goto error; 963 } 964 965 if (msize < c->msize) 966 c->msize = msize; 967 968 error: 969 kfree(version); 970 p9_free_req(c, req); 971 972 return err; 973 } 974 975 struct p9_client *p9_client_create(const char *dev_name, char *options) 976 { 977 int err; 978 struct p9_client *clnt; 979 980 err = 0; 981 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 982 if (!clnt) 983 return ERR_PTR(-ENOMEM); 984 985 clnt->trans_mod = NULL; 986 clnt->trans = NULL; 987 spin_lock_init(&clnt->lock); 988 INIT_LIST_HEAD(&clnt->fidlist); 989 990 err = p9_tag_init(clnt); 991 if (err < 0) 992 goto free_client; 993 994 err = parse_opts(options, clnt); 995 if (err < 0) 996 goto destroy_tagpool; 997 998 if (!clnt->trans_mod) 999 clnt->trans_mod = v9fs_get_default_trans(); 1000 1001 if (clnt->trans_mod == NULL) { 1002 err = -EPROTONOSUPPORT; 1003 p9_debug(P9_DEBUG_ERROR, 1004 "No transport defined or default transport\n"); 1005 goto destroy_tagpool; 1006 } 1007 1008 clnt->fidpool = p9_idpool_create(); 1009 if (IS_ERR(clnt->fidpool)) { 1010 err = PTR_ERR(clnt->fidpool); 1011 goto put_trans; 1012 } 1013 1014 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1015 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1016 1017 err = clnt->trans_mod->create(clnt, dev_name, options); 1018 if (err) 1019 goto destroy_fidpool; 1020 1021 if (clnt->msize > clnt->trans_mod->maxsize) 1022 clnt->msize = clnt->trans_mod->maxsize; 1023 1024 err = p9_client_version(clnt); 1025 if (err) 1026 goto close_trans; 1027 1028 return clnt; 1029 1030 close_trans: 1031 clnt->trans_mod->close(clnt); 1032 destroy_fidpool: 1033 p9_idpool_destroy(clnt->fidpool); 1034 put_trans: 1035 v9fs_put_trans(clnt->trans_mod); 1036 destroy_tagpool: 1037 p9_idpool_destroy(clnt->tagpool); 1038 free_client: 1039 kfree(clnt); 1040 return ERR_PTR(err); 1041 } 1042 EXPORT_SYMBOL(p9_client_create); 1043 1044 void p9_client_destroy(struct p9_client *clnt) 1045 { 1046 struct p9_fid *fid, *fidptr; 1047 1048 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1049 1050 if (clnt->trans_mod) 1051 clnt->trans_mod->close(clnt); 1052 1053 v9fs_put_trans(clnt->trans_mod); 1054 1055 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { 1056 pr_info("Found fid %d not clunked\n", fid->fid); 1057 p9_fid_destroy(fid); 1058 } 1059 1060 if (clnt->fidpool) 1061 p9_idpool_destroy(clnt->fidpool); 1062 1063 p9_tag_cleanup(clnt); 1064 1065 kfree(clnt); 1066 } 1067 EXPORT_SYMBOL(p9_client_destroy); 1068 1069 void p9_client_disconnect(struct p9_client *clnt) 1070 { 1071 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1072 clnt->status = Disconnected; 1073 } 1074 EXPORT_SYMBOL(p9_client_disconnect); 1075 1076 void p9_client_begin_disconnect(struct p9_client *clnt) 1077 { 1078 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1079 clnt->status = BeginDisconnect; 1080 } 1081 EXPORT_SYMBOL(p9_client_begin_disconnect); 1082 1083 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1084 char *uname, kuid_t n_uname, char *aname) 1085 { 1086 int err = 0; 1087 struct p9_req_t *req; 1088 struct p9_fid *fid; 1089 struct p9_qid qid; 1090 1091 1092 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1093 afid ? afid->fid : -1, uname, aname); 1094 fid = p9_fid_create(clnt); 1095 if (IS_ERR(fid)) { 1096 err = PTR_ERR(fid); 1097 fid = NULL; 1098 goto error; 1099 } 1100 1101 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1102 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1103 if (IS_ERR(req)) { 1104 err = PTR_ERR(req); 1105 goto error; 1106 } 1107 1108 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 1109 if (err) { 1110 trace_9p_protocol_dump(clnt, req->rc); 1111 p9_free_req(clnt, req); 1112 goto error; 1113 } 1114 1115 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1116 qid.type, (unsigned long long)qid.path, qid.version); 1117 1118 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1119 1120 p9_free_req(clnt, req); 1121 return fid; 1122 1123 error: 1124 if (fid) 1125 p9_fid_destroy(fid); 1126 return ERR_PTR(err); 1127 } 1128 EXPORT_SYMBOL(p9_client_attach); 1129 1130 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1131 char **wnames, int clone) 1132 { 1133 int err; 1134 struct p9_client *clnt; 1135 struct p9_fid *fid; 1136 struct p9_qid *wqids; 1137 struct p9_req_t *req; 1138 uint16_t nwqids, count; 1139 1140 err = 0; 1141 wqids = NULL; 1142 clnt = oldfid->clnt; 1143 if (clone) { 1144 fid = p9_fid_create(clnt); 1145 if (IS_ERR(fid)) { 1146 err = PTR_ERR(fid); 1147 fid = NULL; 1148 goto error; 1149 } 1150 1151 fid->uid = oldfid->uid; 1152 } else 1153 fid = oldfid; 1154 1155 1156 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1157 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1158 1159 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1160 nwname, wnames); 1161 if (IS_ERR(req)) { 1162 err = PTR_ERR(req); 1163 goto error; 1164 } 1165 1166 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1167 if (err) { 1168 trace_9p_protocol_dump(clnt, req->rc); 1169 p9_free_req(clnt, req); 1170 goto clunk_fid; 1171 } 1172 p9_free_req(clnt, req); 1173 1174 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1175 1176 if (nwqids != nwname) { 1177 err = -ENOENT; 1178 goto clunk_fid; 1179 } 1180 1181 for (count = 0; count < nwqids; count++) 1182 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1183 count, wqids[count].type, 1184 (unsigned long long)wqids[count].path, 1185 wqids[count].version); 1186 1187 if (nwname) 1188 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1189 else 1190 fid->qid = oldfid->qid; 1191 1192 kfree(wqids); 1193 return fid; 1194 1195 clunk_fid: 1196 kfree(wqids); 1197 p9_client_clunk(fid); 1198 fid = NULL; 1199 1200 error: 1201 if (fid && (fid != oldfid)) 1202 p9_fid_destroy(fid); 1203 1204 return ERR_PTR(err); 1205 } 1206 EXPORT_SYMBOL(p9_client_walk); 1207 1208 int p9_client_open(struct p9_fid *fid, int mode) 1209 { 1210 int err; 1211 struct p9_client *clnt; 1212 struct p9_req_t *req; 1213 struct p9_qid qid; 1214 int iounit; 1215 1216 clnt = fid->clnt; 1217 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1218 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1219 err = 0; 1220 1221 if (fid->mode != -1) 1222 return -EINVAL; 1223 1224 if (p9_is_proto_dotl(clnt)) 1225 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1226 else 1227 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1228 if (IS_ERR(req)) { 1229 err = PTR_ERR(req); 1230 goto error; 1231 } 1232 1233 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1234 if (err) { 1235 trace_9p_protocol_dump(clnt, req->rc); 1236 goto free_and_error; 1237 } 1238 1239 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1240 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1241 (unsigned long long)qid.path, qid.version, iounit); 1242 1243 fid->mode = mode; 1244 fid->iounit = iounit; 1245 1246 free_and_error: 1247 p9_free_req(clnt, req); 1248 error: 1249 return err; 1250 } 1251 EXPORT_SYMBOL(p9_client_open); 1252 1253 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode, 1254 kgid_t gid, struct p9_qid *qid) 1255 { 1256 int err = 0; 1257 struct p9_client *clnt; 1258 struct p9_req_t *req; 1259 int iounit; 1260 1261 p9_debug(P9_DEBUG_9P, 1262 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1263 ofid->fid, name, flags, mode, 1264 from_kgid(&init_user_ns, gid)); 1265 clnt = ofid->clnt; 1266 1267 if (ofid->mode != -1) 1268 return -EINVAL; 1269 1270 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1271 mode, gid); 1272 if (IS_ERR(req)) { 1273 err = PTR_ERR(req); 1274 goto error; 1275 } 1276 1277 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1278 if (err) { 1279 trace_9p_protocol_dump(clnt, req->rc); 1280 goto free_and_error; 1281 } 1282 1283 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1284 qid->type, 1285 (unsigned long long)qid->path, 1286 qid->version, iounit); 1287 1288 ofid->mode = mode; 1289 ofid->iounit = iounit; 1290 1291 free_and_error: 1292 p9_free_req(clnt, req); 1293 error: 1294 return err; 1295 } 1296 EXPORT_SYMBOL(p9_client_create_dotl); 1297 1298 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, 1299 char *extension) 1300 { 1301 int err; 1302 struct p9_client *clnt; 1303 struct p9_req_t *req; 1304 struct p9_qid qid; 1305 int iounit; 1306 1307 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1308 fid->fid, name, perm, mode); 1309 err = 0; 1310 clnt = fid->clnt; 1311 1312 if (fid->mode != -1) 1313 return -EINVAL; 1314 1315 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1316 mode, extension); 1317 if (IS_ERR(req)) { 1318 err = PTR_ERR(req); 1319 goto error; 1320 } 1321 1322 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1323 if (err) { 1324 trace_9p_protocol_dump(clnt, req->rc); 1325 goto free_and_error; 1326 } 1327 1328 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1329 qid.type, 1330 (unsigned long long)qid.path, 1331 qid.version, iounit); 1332 1333 fid->mode = mode; 1334 fid->iounit = iounit; 1335 1336 free_and_error: 1337 p9_free_req(clnt, req); 1338 error: 1339 return err; 1340 } 1341 EXPORT_SYMBOL(p9_client_fcreate); 1342 1343 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid, 1344 struct p9_qid *qid) 1345 { 1346 int err = 0; 1347 struct p9_client *clnt; 1348 struct p9_req_t *req; 1349 1350 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1351 dfid->fid, name, symtgt); 1352 clnt = dfid->clnt; 1353 1354 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1355 gid); 1356 if (IS_ERR(req)) { 1357 err = PTR_ERR(req); 1358 goto error; 1359 } 1360 1361 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1362 if (err) { 1363 trace_9p_protocol_dump(clnt, req->rc); 1364 goto free_and_error; 1365 } 1366 1367 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1368 qid->type, (unsigned long long)qid->path, qid->version); 1369 1370 free_and_error: 1371 p9_free_req(clnt, req); 1372 error: 1373 return err; 1374 } 1375 EXPORT_SYMBOL(p9_client_symlink); 1376 1377 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname) 1378 { 1379 struct p9_client *clnt; 1380 struct p9_req_t *req; 1381 1382 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1383 dfid->fid, oldfid->fid, newname); 1384 clnt = dfid->clnt; 1385 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1386 newname); 1387 if (IS_ERR(req)) 1388 return PTR_ERR(req); 1389 1390 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1391 p9_free_req(clnt, req); 1392 return 0; 1393 } 1394 EXPORT_SYMBOL(p9_client_link); 1395 1396 int p9_client_fsync(struct p9_fid *fid, int datasync) 1397 { 1398 int err; 1399 struct p9_client *clnt; 1400 struct p9_req_t *req; 1401 1402 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1403 fid->fid, datasync); 1404 err = 0; 1405 clnt = fid->clnt; 1406 1407 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1408 if (IS_ERR(req)) { 1409 err = PTR_ERR(req); 1410 goto error; 1411 } 1412 1413 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1414 1415 p9_free_req(clnt, req); 1416 1417 error: 1418 return err; 1419 } 1420 EXPORT_SYMBOL(p9_client_fsync); 1421 1422 int p9_client_clunk(struct p9_fid *fid) 1423 { 1424 int err; 1425 struct p9_client *clnt; 1426 struct p9_req_t *req; 1427 int retries = 0; 1428 1429 if (!fid) { 1430 pr_warn("%s (%d): Trying to clunk with NULL fid\n", 1431 __func__, task_pid_nr(current)); 1432 dump_stack(); 1433 return 0; 1434 } 1435 1436 again: 1437 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1438 retries); 1439 err = 0; 1440 clnt = fid->clnt; 1441 1442 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1443 if (IS_ERR(req)) { 1444 err = PTR_ERR(req); 1445 goto error; 1446 } 1447 1448 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1449 1450 p9_free_req(clnt, req); 1451 error: 1452 /* 1453 * Fid is not valid even after a failed clunk 1454 * If interrupted, retry once then give up and 1455 * leak fid until umount. 1456 */ 1457 if (err == -ERESTARTSYS) { 1458 if (retries++ == 0) 1459 goto again; 1460 } else 1461 p9_fid_destroy(fid); 1462 return err; 1463 } 1464 EXPORT_SYMBOL(p9_client_clunk); 1465 1466 int p9_client_remove(struct p9_fid *fid) 1467 { 1468 int err; 1469 struct p9_client *clnt; 1470 struct p9_req_t *req; 1471 1472 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1473 err = 0; 1474 clnt = fid->clnt; 1475 1476 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1477 if (IS_ERR(req)) { 1478 err = PTR_ERR(req); 1479 goto error; 1480 } 1481 1482 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1483 1484 p9_free_req(clnt, req); 1485 error: 1486 if (err == -ERESTARTSYS) 1487 p9_client_clunk(fid); 1488 else 1489 p9_fid_destroy(fid); 1490 return err; 1491 } 1492 EXPORT_SYMBOL(p9_client_remove); 1493 1494 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1495 { 1496 int err = 0; 1497 struct p9_req_t *req; 1498 struct p9_client *clnt; 1499 1500 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1501 dfid->fid, name, flags); 1502 1503 clnt = dfid->clnt; 1504 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1505 if (IS_ERR(req)) { 1506 err = PTR_ERR(req); 1507 goto error; 1508 } 1509 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1510 1511 p9_free_req(clnt, req); 1512 error: 1513 return err; 1514 } 1515 EXPORT_SYMBOL(p9_client_unlinkat); 1516 1517 int 1518 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, 1519 u32 count) 1520 { 1521 char *dataptr; 1522 int kernel_buf = 0; 1523 struct p9_req_t *req; 1524 struct p9_client *clnt; 1525 int err, rsize, non_zc = 0; 1526 1527 1528 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1529 fid->fid, (unsigned long long) offset, count); 1530 err = 0; 1531 clnt = fid->clnt; 1532 1533 rsize = fid->iounit; 1534 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1535 rsize = clnt->msize - P9_IOHDRSZ; 1536 1537 if (count < rsize) 1538 rsize = count; 1539 1540 /* Don't bother zerocopy for small IO (< 1024) */ 1541 if (clnt->trans_mod->zc_request && rsize > 1024) { 1542 char *indata; 1543 if (data) { 1544 kernel_buf = 1; 1545 indata = data; 1546 } else 1547 indata = (__force char *)udata; 1548 /* 1549 * response header len is 11 1550 * PDU Header(7) + IO Size (4) 1551 */ 1552 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0, 1553 11, kernel_buf, "dqd", fid->fid, 1554 offset, rsize); 1555 } else { 1556 non_zc = 1; 1557 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1558 rsize); 1559 } 1560 if (IS_ERR(req)) { 1561 err = PTR_ERR(req); 1562 goto error; 1563 } 1564 1565 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1566 if (err) { 1567 trace_9p_protocol_dump(clnt, req->rc); 1568 goto free_and_error; 1569 } 1570 1571 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1572 1573 if (non_zc) { 1574 if (data) { 1575 memmove(data, dataptr, count); 1576 } else { 1577 err = copy_to_user(udata, dataptr, count); 1578 if (err) { 1579 err = -EFAULT; 1580 goto free_and_error; 1581 } 1582 } 1583 } 1584 p9_free_req(clnt, req); 1585 return count; 1586 1587 free_and_error: 1588 p9_free_req(clnt, req); 1589 error: 1590 return err; 1591 } 1592 EXPORT_SYMBOL(p9_client_read); 1593 1594 int 1595 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, 1596 u64 offset, u32 count) 1597 { 1598 int err, rsize; 1599 int kernel_buf = 0; 1600 struct p9_client *clnt; 1601 struct p9_req_t *req; 1602 1603 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", 1604 fid->fid, (unsigned long long) offset, count); 1605 err = 0; 1606 clnt = fid->clnt; 1607 1608 rsize = fid->iounit; 1609 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1610 rsize = clnt->msize - P9_IOHDRSZ; 1611 1612 if (count < rsize) 1613 rsize = count; 1614 1615 /* Don't bother zerocopy for small IO (< 1024) */ 1616 if (clnt->trans_mod->zc_request && rsize > 1024) { 1617 char *odata; 1618 if (data) { 1619 kernel_buf = 1; 1620 odata = data; 1621 } else 1622 odata = (char *)udata; 1623 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize, 1624 P9_ZC_HDR_SZ, kernel_buf, "dqd", 1625 fid->fid, offset, rsize); 1626 } else { 1627 if (data) 1628 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, 1629 offset, rsize, data); 1630 else 1631 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, 1632 offset, rsize, udata); 1633 } 1634 if (IS_ERR(req)) { 1635 err = PTR_ERR(req); 1636 goto error; 1637 } 1638 1639 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1640 if (err) { 1641 trace_9p_protocol_dump(clnt, req->rc); 1642 goto free_and_error; 1643 } 1644 1645 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1646 1647 p9_free_req(clnt, req); 1648 return count; 1649 1650 free_and_error: 1651 p9_free_req(clnt, req); 1652 error: 1653 return err; 1654 } 1655 EXPORT_SYMBOL(p9_client_write); 1656 1657 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1658 { 1659 int err; 1660 struct p9_client *clnt; 1661 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1662 struct p9_req_t *req; 1663 u16 ignored; 1664 1665 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1666 1667 if (!ret) 1668 return ERR_PTR(-ENOMEM); 1669 1670 err = 0; 1671 clnt = fid->clnt; 1672 1673 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1674 if (IS_ERR(req)) { 1675 err = PTR_ERR(req); 1676 goto error; 1677 } 1678 1679 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1680 if (err) { 1681 trace_9p_protocol_dump(clnt, req->rc); 1682 p9_free_req(clnt, req); 1683 goto error; 1684 } 1685 1686 p9_debug(P9_DEBUG_9P, 1687 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1688 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1689 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1690 "<<< uid=%d gid=%d n_muid=%d\n", 1691 ret->size, ret->type, ret->dev, ret->qid.type, 1692 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1693 ret->atime, ret->mtime, (unsigned long long)ret->length, 1694 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1695 from_kuid(&init_user_ns, ret->n_uid), 1696 from_kgid(&init_user_ns, ret->n_gid), 1697 from_kuid(&init_user_ns, ret->n_muid)); 1698 1699 p9_free_req(clnt, req); 1700 return ret; 1701 1702 error: 1703 kfree(ret); 1704 return ERR_PTR(err); 1705 } 1706 EXPORT_SYMBOL(p9_client_stat); 1707 1708 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1709 u64 request_mask) 1710 { 1711 int err; 1712 struct p9_client *clnt; 1713 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1714 GFP_KERNEL); 1715 struct p9_req_t *req; 1716 1717 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1718 fid->fid, request_mask); 1719 1720 if (!ret) 1721 return ERR_PTR(-ENOMEM); 1722 1723 err = 0; 1724 clnt = fid->clnt; 1725 1726 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1727 if (IS_ERR(req)) { 1728 err = PTR_ERR(req); 1729 goto error; 1730 } 1731 1732 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1733 if (err) { 1734 trace_9p_protocol_dump(clnt, req->rc); 1735 p9_free_req(clnt, req); 1736 goto error; 1737 } 1738 1739 p9_debug(P9_DEBUG_9P, 1740 "<<< RGETATTR st_result_mask=%lld\n" 1741 "<<< qid=%x.%llx.%x\n" 1742 "<<< st_mode=%8.8x st_nlink=%llu\n" 1743 "<<< st_uid=%d st_gid=%d\n" 1744 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1745 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1746 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1747 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1748 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1749 "<<< st_gen=%lld st_data_version=%lld", 1750 ret->st_result_mask, ret->qid.type, ret->qid.path, 1751 ret->qid.version, ret->st_mode, ret->st_nlink, 1752 from_kuid(&init_user_ns, ret->st_uid), 1753 from_kgid(&init_user_ns, ret->st_gid), 1754 ret->st_rdev, ret->st_size, ret->st_blksize, 1755 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1756 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1757 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1758 ret->st_gen, ret->st_data_version); 1759 1760 p9_free_req(clnt, req); 1761 return ret; 1762 1763 error: 1764 kfree(ret); 1765 return ERR_PTR(err); 1766 } 1767 EXPORT_SYMBOL(p9_client_getattr_dotl); 1768 1769 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1770 { 1771 int ret; 1772 1773 /* NOTE: size shouldn't include its own length */ 1774 /* size[2] type[2] dev[4] qid[13] */ 1775 /* mode[4] atime[4] mtime[4] length[8]*/ 1776 /* name[s] uid[s] gid[s] muid[s] */ 1777 ret = 2+4+13+4+4+4+8+2+2+2+2; 1778 1779 if (wst->name) 1780 ret += strlen(wst->name); 1781 if (wst->uid) 1782 ret += strlen(wst->uid); 1783 if (wst->gid) 1784 ret += strlen(wst->gid); 1785 if (wst->muid) 1786 ret += strlen(wst->muid); 1787 1788 if ((proto_version == p9_proto_2000u) || 1789 (proto_version == p9_proto_2000L)) { 1790 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1791 if (wst->extension) 1792 ret += strlen(wst->extension); 1793 } 1794 1795 return ret; 1796 } 1797 1798 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1799 { 1800 int err; 1801 struct p9_req_t *req; 1802 struct p9_client *clnt; 1803 1804 err = 0; 1805 clnt = fid->clnt; 1806 wst->size = p9_client_statsize(wst, clnt->proto_version); 1807 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1808 p9_debug(P9_DEBUG_9P, 1809 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1810 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1811 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1812 " uid=%d gid=%d n_muid=%d\n", 1813 wst->size, wst->type, wst->dev, wst->qid.type, 1814 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1815 wst->atime, wst->mtime, (unsigned long long)wst->length, 1816 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1817 from_kuid(&init_user_ns, wst->n_uid), 1818 from_kgid(&init_user_ns, wst->n_gid), 1819 from_kuid(&init_user_ns, wst->n_muid)); 1820 1821 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1822 if (IS_ERR(req)) { 1823 err = PTR_ERR(req); 1824 goto error; 1825 } 1826 1827 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1828 1829 p9_free_req(clnt, req); 1830 error: 1831 return err; 1832 } 1833 EXPORT_SYMBOL(p9_client_wstat); 1834 1835 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1836 { 1837 int err; 1838 struct p9_req_t *req; 1839 struct p9_client *clnt; 1840 1841 err = 0; 1842 clnt = fid->clnt; 1843 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1844 p9_debug(P9_DEBUG_9P, 1845 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1846 " atime_sec=%lld atime_nsec=%lld\n" 1847 " mtime_sec=%lld mtime_nsec=%lld\n", 1848 p9attr->valid, p9attr->mode, 1849 from_kuid(&init_user_ns, p9attr->uid), 1850 from_kgid(&init_user_ns, p9attr->gid), 1851 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1852 p9attr->mtime_sec, p9attr->mtime_nsec); 1853 1854 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1855 1856 if (IS_ERR(req)) { 1857 err = PTR_ERR(req); 1858 goto error; 1859 } 1860 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1861 p9_free_req(clnt, req); 1862 error: 1863 return err; 1864 } 1865 EXPORT_SYMBOL(p9_client_setattr); 1866 1867 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1868 { 1869 int err; 1870 struct p9_req_t *req; 1871 struct p9_client *clnt; 1872 1873 err = 0; 1874 clnt = fid->clnt; 1875 1876 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1877 1878 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1879 if (IS_ERR(req)) { 1880 err = PTR_ERR(req); 1881 goto error; 1882 } 1883 1884 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1885 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1886 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1887 if (err) { 1888 trace_9p_protocol_dump(clnt, req->rc); 1889 p9_free_req(clnt, req); 1890 goto error; 1891 } 1892 1893 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1894 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1895 "fsid %llu namelen %ld\n", 1896 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1897 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1898 sb->fsid, (long int)sb->namelen); 1899 1900 p9_free_req(clnt, req); 1901 error: 1902 return err; 1903 } 1904 EXPORT_SYMBOL(p9_client_statfs); 1905 1906 int p9_client_rename(struct p9_fid *fid, 1907 struct p9_fid *newdirfid, const char *name) 1908 { 1909 int err; 1910 struct p9_req_t *req; 1911 struct p9_client *clnt; 1912 1913 err = 0; 1914 clnt = fid->clnt; 1915 1916 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1917 fid->fid, newdirfid->fid, name); 1918 1919 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1920 newdirfid->fid, name); 1921 if (IS_ERR(req)) { 1922 err = PTR_ERR(req); 1923 goto error; 1924 } 1925 1926 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1927 1928 p9_free_req(clnt, req); 1929 error: 1930 return err; 1931 } 1932 EXPORT_SYMBOL(p9_client_rename); 1933 1934 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1935 struct p9_fid *newdirfid, const char *new_name) 1936 { 1937 int err; 1938 struct p9_req_t *req; 1939 struct p9_client *clnt; 1940 1941 err = 0; 1942 clnt = olddirfid->clnt; 1943 1944 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1945 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1946 newdirfid->fid, new_name); 1947 1948 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1949 old_name, newdirfid->fid, new_name); 1950 if (IS_ERR(req)) { 1951 err = PTR_ERR(req); 1952 goto error; 1953 } 1954 1955 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1956 newdirfid->fid, new_name); 1957 1958 p9_free_req(clnt, req); 1959 error: 1960 return err; 1961 } 1962 EXPORT_SYMBOL(p9_client_renameat); 1963 1964 /* 1965 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1966 */ 1967 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1968 const char *attr_name, u64 *attr_size) 1969 { 1970 int err; 1971 struct p9_req_t *req; 1972 struct p9_client *clnt; 1973 struct p9_fid *attr_fid; 1974 1975 err = 0; 1976 clnt = file_fid->clnt; 1977 attr_fid = p9_fid_create(clnt); 1978 if (IS_ERR(attr_fid)) { 1979 err = PTR_ERR(attr_fid); 1980 attr_fid = NULL; 1981 goto error; 1982 } 1983 p9_debug(P9_DEBUG_9P, 1984 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 1985 file_fid->fid, attr_fid->fid, attr_name); 1986 1987 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 1988 file_fid->fid, attr_fid->fid, attr_name); 1989 if (IS_ERR(req)) { 1990 err = PTR_ERR(req); 1991 goto error; 1992 } 1993 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 1994 if (err) { 1995 trace_9p_protocol_dump(clnt, req->rc); 1996 p9_free_req(clnt, req); 1997 goto clunk_fid; 1998 } 1999 p9_free_req(clnt, req); 2000 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2001 attr_fid->fid, *attr_size); 2002 return attr_fid; 2003 clunk_fid: 2004 p9_client_clunk(attr_fid); 2005 attr_fid = NULL; 2006 error: 2007 if (attr_fid && (attr_fid != file_fid)) 2008 p9_fid_destroy(attr_fid); 2009 2010 return ERR_PTR(err); 2011 } 2012 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2013 2014 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2015 u64 attr_size, int flags) 2016 { 2017 int err; 2018 struct p9_req_t *req; 2019 struct p9_client *clnt; 2020 2021 p9_debug(P9_DEBUG_9P, 2022 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2023 fid->fid, name, (long long)attr_size, flags); 2024 err = 0; 2025 clnt = fid->clnt; 2026 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2027 fid->fid, name, attr_size, flags); 2028 if (IS_ERR(req)) { 2029 err = PTR_ERR(req); 2030 goto error; 2031 } 2032 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2033 p9_free_req(clnt, req); 2034 error: 2035 return err; 2036 } 2037 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2038 2039 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2040 { 2041 int err, rsize, non_zc = 0; 2042 struct p9_client *clnt; 2043 struct p9_req_t *req; 2044 char *dataptr; 2045 2046 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2047 fid->fid, (unsigned long long) offset, count); 2048 2049 err = 0; 2050 clnt = fid->clnt; 2051 2052 rsize = fid->iounit; 2053 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2054 rsize = clnt->msize - P9_READDIRHDRSZ; 2055 2056 if (count < rsize) 2057 rsize = count; 2058 2059 /* Don't bother zerocopy for small IO (< 1024) */ 2060 if (clnt->trans_mod->zc_request && rsize > 1024) { 2061 /* 2062 * response header len is 11 2063 * PDU Header(7) + IO Size (4) 2064 */ 2065 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0, 2066 11, 1, "dqd", fid->fid, offset, rsize); 2067 } else { 2068 non_zc = 1; 2069 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2070 offset, rsize); 2071 } 2072 if (IS_ERR(req)) { 2073 err = PTR_ERR(req); 2074 goto error; 2075 } 2076 2077 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 2078 if (err) { 2079 trace_9p_protocol_dump(clnt, req->rc); 2080 goto free_and_error; 2081 } 2082 2083 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2084 2085 if (non_zc) 2086 memmove(data, dataptr, count); 2087 2088 p9_free_req(clnt, req); 2089 return count; 2090 2091 free_and_error: 2092 p9_free_req(clnt, req); 2093 error: 2094 return err; 2095 } 2096 EXPORT_SYMBOL(p9_client_readdir); 2097 2098 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode, 2099 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2100 { 2101 int err; 2102 struct p9_client *clnt; 2103 struct p9_req_t *req; 2104 2105 err = 0; 2106 clnt = fid->clnt; 2107 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2108 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2109 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2110 MAJOR(rdev), MINOR(rdev), gid); 2111 if (IS_ERR(req)) 2112 return PTR_ERR(req); 2113 2114 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2115 if (err) { 2116 trace_9p_protocol_dump(clnt, req->rc); 2117 goto error; 2118 } 2119 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2120 (unsigned long long)qid->path, qid->version); 2121 2122 error: 2123 p9_free_req(clnt, req); 2124 return err; 2125 2126 } 2127 EXPORT_SYMBOL(p9_client_mknod_dotl); 2128 2129 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode, 2130 kgid_t gid, struct p9_qid *qid) 2131 { 2132 int err; 2133 struct p9_client *clnt; 2134 struct p9_req_t *req; 2135 2136 err = 0; 2137 clnt = fid->clnt; 2138 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2139 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2140 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2141 gid); 2142 if (IS_ERR(req)) 2143 return PTR_ERR(req); 2144 2145 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2146 if (err) { 2147 trace_9p_protocol_dump(clnt, req->rc); 2148 goto error; 2149 } 2150 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2151 (unsigned long long)qid->path, qid->version); 2152 2153 error: 2154 p9_free_req(clnt, req); 2155 return err; 2156 2157 } 2158 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2159 2160 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2161 { 2162 int err; 2163 struct p9_client *clnt; 2164 struct p9_req_t *req; 2165 2166 err = 0; 2167 clnt = fid->clnt; 2168 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2169 "start %lld length %lld proc_id %d client_id %s\n", 2170 fid->fid, flock->type, flock->flags, flock->start, 2171 flock->length, flock->proc_id, flock->client_id); 2172 2173 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2174 flock->flags, flock->start, flock->length, 2175 flock->proc_id, flock->client_id); 2176 2177 if (IS_ERR(req)) 2178 return PTR_ERR(req); 2179 2180 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); 2181 if (err) { 2182 trace_9p_protocol_dump(clnt, req->rc); 2183 goto error; 2184 } 2185 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2186 error: 2187 p9_free_req(clnt, req); 2188 return err; 2189 2190 } 2191 EXPORT_SYMBOL(p9_client_lock_dotl); 2192 2193 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2194 { 2195 int err; 2196 struct p9_client *clnt; 2197 struct p9_req_t *req; 2198 2199 err = 0; 2200 clnt = fid->clnt; 2201 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2202 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2203 glock->start, glock->length, glock->proc_id, glock->client_id); 2204 2205 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2206 glock->start, glock->length, glock->proc_id, glock->client_id); 2207 2208 if (IS_ERR(req)) 2209 return PTR_ERR(req); 2210 2211 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, 2212 &glock->start, &glock->length, &glock->proc_id, 2213 &glock->client_id); 2214 if (err) { 2215 trace_9p_protocol_dump(clnt, req->rc); 2216 goto error; 2217 } 2218 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2219 "proc_id %d client_id %s\n", glock->type, glock->start, 2220 glock->length, glock->proc_id, glock->client_id); 2221 error: 2222 p9_free_req(clnt, req); 2223 return err; 2224 } 2225 EXPORT_SYMBOL(p9_client_getlock_dotl); 2226 2227 int p9_client_readlink(struct p9_fid *fid, char **target) 2228 { 2229 int err; 2230 struct p9_client *clnt; 2231 struct p9_req_t *req; 2232 2233 err = 0; 2234 clnt = fid->clnt; 2235 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2236 2237 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2238 if (IS_ERR(req)) 2239 return PTR_ERR(req); 2240 2241 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); 2242 if (err) { 2243 trace_9p_protocol_dump(clnt, req->rc); 2244 goto error; 2245 } 2246 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2247 error: 2248 p9_free_req(clnt, req); 2249 return err; 2250 } 2251 EXPORT_SYMBOL(p9_client_readlink); 2252