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 uint16_t len; 566 /* 7 = header size for RERROR, 2 is the size of string len; */ 567 int inline_len = in_hdrlen - (7 + 2); 568 569 /* Read the size of error string */ 570 err = p9pdu_readf(req->rc, c->proto_version, "w", &len); 571 if (err) 572 goto out_err; 573 574 ename = kmalloc(len + 1, GFP_NOFS); 575 if (!ename) { 576 err = -ENOMEM; 577 goto out_err; 578 } 579 if (len <= inline_len) { 580 /* We have error in protocol buffer itself */ 581 if (pdu_read(req->rc, ename, len)) { 582 err = -EFAULT; 583 goto out_free; 584 585 } 586 } else { 587 /* 588 * Part of the data is in user space buffer. 589 */ 590 if (pdu_read(req->rc, ename, inline_len)) { 591 err = -EFAULT; 592 goto out_free; 593 594 } 595 if (kern_buf) { 596 memcpy(ename + inline_len, uidata, 597 len - inline_len); 598 } else { 599 err = copy_from_user(ename + inline_len, 600 uidata, len - inline_len); 601 if (err) { 602 err = -EFAULT; 603 goto out_free; 604 } 605 } 606 } 607 ename[len] = 0; 608 if (p9_is_proto_dotu(c)) { 609 /* For dotu we also have error code */ 610 err = p9pdu_readf(req->rc, 611 c->proto_version, "d", &ecode); 612 if (err) 613 goto out_free; 614 err = -ecode; 615 } 616 if (!err || !IS_ERR_VALUE(err)) { 617 err = p9_errstr2errno(ename, strlen(ename)); 618 619 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 620 -ecode, ename); 621 } 622 kfree(ename); 623 } else { 624 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 625 err = -ecode; 626 627 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 628 } 629 return err; 630 631 out_free: 632 kfree(ename); 633 out_err: 634 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 635 return err; 636 } 637 638 static struct p9_req_t * 639 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 640 641 /** 642 * p9_client_flush - flush (cancel) a request 643 * @c: client state 644 * @oldreq: request to cancel 645 * 646 * This sents a flush for a particular request and links 647 * the flush request to the original request. The current 648 * code only supports a single flush request although the protocol 649 * allows for multiple flush requests to be sent for a single request. 650 * 651 */ 652 653 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 654 { 655 struct p9_req_t *req; 656 int16_t oldtag; 657 int err; 658 659 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 660 if (err) 661 return err; 662 663 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 664 665 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 666 if (IS_ERR(req)) 667 return PTR_ERR(req); 668 669 670 /* if we haven't received a response for oldreq, 671 remove it from the list. */ 672 spin_lock(&c->lock); 673 if (oldreq->status == REQ_STATUS_FLSH) 674 list_del(&oldreq->req_list); 675 spin_unlock(&c->lock); 676 677 p9_free_req(c, req); 678 return 0; 679 } 680 681 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 682 int8_t type, int req_size, 683 const char *fmt, va_list ap) 684 { 685 int tag, err; 686 struct p9_req_t *req; 687 688 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 689 690 /* we allow for any status other than disconnected */ 691 if (c->status == Disconnected) 692 return ERR_PTR(-EIO); 693 694 /* if status is begin_disconnected we allow only clunk request */ 695 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 696 return ERR_PTR(-EIO); 697 698 tag = P9_NOTAG; 699 if (type != P9_TVERSION) { 700 tag = p9_idpool_get(c->tagpool); 701 if (tag < 0) 702 return ERR_PTR(-ENOMEM); 703 } 704 705 req = p9_tag_alloc(c, tag, req_size); 706 if (IS_ERR(req)) 707 return req; 708 709 /* marshall the data */ 710 p9pdu_prepare(req->tc, tag, type); 711 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 712 if (err) 713 goto reterr; 714 p9pdu_finalize(c, req->tc); 715 trace_9p_client_req(c, type, tag); 716 return req; 717 reterr: 718 p9_free_req(c, req); 719 return ERR_PTR(err); 720 } 721 722 /** 723 * p9_client_rpc - issue a request and wait for a response 724 * @c: client session 725 * @type: type of request 726 * @fmt: protocol format string (see protocol.c) 727 * 728 * Returns request structure (which client must free using p9_free_req) 729 */ 730 731 static struct p9_req_t * 732 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 733 { 734 va_list ap; 735 int sigpending, err; 736 unsigned long flags; 737 struct p9_req_t *req; 738 739 va_start(ap, fmt); 740 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 741 va_end(ap); 742 if (IS_ERR(req)) 743 return req; 744 745 if (signal_pending(current)) { 746 sigpending = 1; 747 clear_thread_flag(TIF_SIGPENDING); 748 } else 749 sigpending = 0; 750 751 err = c->trans_mod->request(c, req); 752 if (err < 0) { 753 if (err != -ERESTARTSYS && err != -EFAULT) 754 c->status = Disconnected; 755 goto reterr; 756 } 757 again: 758 /* Wait for the response */ 759 err = wait_event_interruptible(*req->wq, 760 req->status >= REQ_STATUS_RCVD); 761 762 if ((err == -ERESTARTSYS) && (c->status == Connected) 763 && (type == P9_TFLUSH)) { 764 sigpending = 1; 765 clear_thread_flag(TIF_SIGPENDING); 766 goto again; 767 } 768 769 if (req->status == REQ_STATUS_ERROR) { 770 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 771 err = req->t_err; 772 } 773 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 774 p9_debug(P9_DEBUG_MUX, "flushing\n"); 775 sigpending = 1; 776 clear_thread_flag(TIF_SIGPENDING); 777 778 if (c->trans_mod->cancel(c, req)) 779 p9_client_flush(c, req); 780 781 /* if we received the response anyway, don't signal error */ 782 if (req->status == REQ_STATUS_RCVD) 783 err = 0; 784 } 785 if (sigpending) { 786 spin_lock_irqsave(¤t->sighand->siglock, flags); 787 recalc_sigpending(); 788 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 789 } 790 if (err < 0) 791 goto reterr; 792 793 err = p9_check_errors(c, req); 794 trace_9p_client_res(c, type, req->rc->tag, err); 795 if (!err) 796 return req; 797 reterr: 798 p9_free_req(c, req); 799 return ERR_PTR(safe_errno(err)); 800 } 801 802 /** 803 * p9_client_zc_rpc - issue a request and wait for a response 804 * @c: client session 805 * @type: type of request 806 * @uidata: user bffer that should be ued for zero copy read 807 * @uodata: user buffer that shoud be user for zero copy write 808 * @inlen: read buffer size 809 * @olen: write buffer size 810 * @hdrlen: reader header size, This is the size of response protocol data 811 * @fmt: protocol format string (see protocol.c) 812 * 813 * Returns request structure (which client must free using p9_free_req) 814 */ 815 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 816 char *uidata, char *uodata, 817 int inlen, int olen, int in_hdrlen, 818 int kern_buf, const char *fmt, ...) 819 { 820 va_list ap; 821 int sigpending, err; 822 unsigned long flags; 823 struct p9_req_t *req; 824 825 va_start(ap, fmt); 826 /* 827 * We allocate a inline protocol data of only 4k bytes. 828 * The actual content is passed in zero-copy fashion. 829 */ 830 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 831 va_end(ap); 832 if (IS_ERR(req)) 833 return req; 834 835 if (signal_pending(current)) { 836 sigpending = 1; 837 clear_thread_flag(TIF_SIGPENDING); 838 } else 839 sigpending = 0; 840 841 /* If we are called with KERNEL_DS force kern_buf */ 842 if (segment_eq(get_fs(), KERNEL_DS)) 843 kern_buf = 1; 844 845 err = c->trans_mod->zc_request(c, req, uidata, uodata, 846 inlen, olen, in_hdrlen, kern_buf); 847 if (err < 0) { 848 if (err == -EIO) 849 c->status = Disconnected; 850 goto reterr; 851 } 852 if (req->status == REQ_STATUS_ERROR) { 853 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 854 err = req->t_err; 855 } 856 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 857 p9_debug(P9_DEBUG_MUX, "flushing\n"); 858 sigpending = 1; 859 clear_thread_flag(TIF_SIGPENDING); 860 861 if (c->trans_mod->cancel(c, req)) 862 p9_client_flush(c, req); 863 864 /* if we received the response anyway, don't signal error */ 865 if (req->status == REQ_STATUS_RCVD) 866 err = 0; 867 } 868 if (sigpending) { 869 spin_lock_irqsave(¤t->sighand->siglock, flags); 870 recalc_sigpending(); 871 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 872 } 873 if (err < 0) 874 goto reterr; 875 876 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf); 877 trace_9p_client_res(c, type, req->rc->tag, err); 878 if (!err) 879 return req; 880 reterr: 881 p9_free_req(c, req); 882 return ERR_PTR(safe_errno(err)); 883 } 884 885 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 886 { 887 int ret; 888 struct p9_fid *fid; 889 unsigned long flags; 890 891 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 892 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 893 if (!fid) 894 return ERR_PTR(-ENOMEM); 895 896 ret = p9_idpool_get(clnt->fidpool); 897 if (ret < 0) { 898 ret = -ENOSPC; 899 goto error; 900 } 901 fid->fid = ret; 902 903 memset(&fid->qid, 0, sizeof(struct p9_qid)); 904 fid->mode = -1; 905 fid->uid = current_fsuid(); 906 fid->clnt = clnt; 907 fid->rdir = NULL; 908 spin_lock_irqsave(&clnt->lock, flags); 909 list_add(&fid->flist, &clnt->fidlist); 910 spin_unlock_irqrestore(&clnt->lock, flags); 911 912 return fid; 913 914 error: 915 kfree(fid); 916 return ERR_PTR(ret); 917 } 918 919 static void p9_fid_destroy(struct p9_fid *fid) 920 { 921 struct p9_client *clnt; 922 unsigned long flags; 923 924 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 925 clnt = fid->clnt; 926 p9_idpool_put(fid->fid, clnt->fidpool); 927 spin_lock_irqsave(&clnt->lock, flags); 928 list_del(&fid->flist); 929 spin_unlock_irqrestore(&clnt->lock, flags); 930 kfree(fid->rdir); 931 kfree(fid); 932 } 933 934 static int p9_client_version(struct p9_client *c) 935 { 936 int err = 0; 937 struct p9_req_t *req; 938 char *version; 939 int msize; 940 941 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 942 c->msize, c->proto_version); 943 944 switch (c->proto_version) { 945 case p9_proto_2000L: 946 req = p9_client_rpc(c, P9_TVERSION, "ds", 947 c->msize, "9P2000.L"); 948 break; 949 case p9_proto_2000u: 950 req = p9_client_rpc(c, P9_TVERSION, "ds", 951 c->msize, "9P2000.u"); 952 break; 953 case p9_proto_legacy: 954 req = p9_client_rpc(c, P9_TVERSION, "ds", 955 c->msize, "9P2000"); 956 break; 957 default: 958 return -EINVAL; 959 break; 960 } 961 962 if (IS_ERR(req)) 963 return PTR_ERR(req); 964 965 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 966 if (err) { 967 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 968 trace_9p_protocol_dump(c, req->rc); 969 goto error; 970 } 971 972 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 973 if (!strncmp(version, "9P2000.L", 8)) 974 c->proto_version = p9_proto_2000L; 975 else if (!strncmp(version, "9P2000.u", 8)) 976 c->proto_version = p9_proto_2000u; 977 else if (!strncmp(version, "9P2000", 6)) 978 c->proto_version = p9_proto_legacy; 979 else { 980 err = -EREMOTEIO; 981 goto error; 982 } 983 984 if (msize < c->msize) 985 c->msize = msize; 986 987 error: 988 kfree(version); 989 p9_free_req(c, req); 990 991 return err; 992 } 993 994 struct p9_client *p9_client_create(const char *dev_name, char *options) 995 { 996 int err; 997 struct p9_client *clnt; 998 999 err = 0; 1000 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 1001 if (!clnt) 1002 return ERR_PTR(-ENOMEM); 1003 1004 clnt->trans_mod = NULL; 1005 clnt->trans = NULL; 1006 spin_lock_init(&clnt->lock); 1007 INIT_LIST_HEAD(&clnt->fidlist); 1008 1009 err = p9_tag_init(clnt); 1010 if (err < 0) 1011 goto free_client; 1012 1013 err = parse_opts(options, clnt); 1014 if (err < 0) 1015 goto destroy_tagpool; 1016 1017 if (!clnt->trans_mod) 1018 clnt->trans_mod = v9fs_get_default_trans(); 1019 1020 if (clnt->trans_mod == NULL) { 1021 err = -EPROTONOSUPPORT; 1022 p9_debug(P9_DEBUG_ERROR, 1023 "No transport defined or default transport\n"); 1024 goto destroy_tagpool; 1025 } 1026 1027 clnt->fidpool = p9_idpool_create(); 1028 if (IS_ERR(clnt->fidpool)) { 1029 err = PTR_ERR(clnt->fidpool); 1030 goto put_trans; 1031 } 1032 1033 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1034 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1035 1036 err = clnt->trans_mod->create(clnt, dev_name, options); 1037 if (err) 1038 goto destroy_fidpool; 1039 1040 if (clnt->msize > clnt->trans_mod->maxsize) 1041 clnt->msize = clnt->trans_mod->maxsize; 1042 1043 err = p9_client_version(clnt); 1044 if (err) 1045 goto close_trans; 1046 1047 return clnt; 1048 1049 close_trans: 1050 clnt->trans_mod->close(clnt); 1051 destroy_fidpool: 1052 p9_idpool_destroy(clnt->fidpool); 1053 put_trans: 1054 v9fs_put_trans(clnt->trans_mod); 1055 destroy_tagpool: 1056 p9_idpool_destroy(clnt->tagpool); 1057 free_client: 1058 kfree(clnt); 1059 return ERR_PTR(err); 1060 } 1061 EXPORT_SYMBOL(p9_client_create); 1062 1063 void p9_client_destroy(struct p9_client *clnt) 1064 { 1065 struct p9_fid *fid, *fidptr; 1066 1067 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1068 1069 if (clnt->trans_mod) 1070 clnt->trans_mod->close(clnt); 1071 1072 v9fs_put_trans(clnt->trans_mod); 1073 1074 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { 1075 pr_info("Found fid %d not clunked\n", fid->fid); 1076 p9_fid_destroy(fid); 1077 } 1078 1079 if (clnt->fidpool) 1080 p9_idpool_destroy(clnt->fidpool); 1081 1082 p9_tag_cleanup(clnt); 1083 1084 kfree(clnt); 1085 } 1086 EXPORT_SYMBOL(p9_client_destroy); 1087 1088 void p9_client_disconnect(struct p9_client *clnt) 1089 { 1090 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1091 clnt->status = Disconnected; 1092 } 1093 EXPORT_SYMBOL(p9_client_disconnect); 1094 1095 void p9_client_begin_disconnect(struct p9_client *clnt) 1096 { 1097 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1098 clnt->status = BeginDisconnect; 1099 } 1100 EXPORT_SYMBOL(p9_client_begin_disconnect); 1101 1102 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1103 char *uname, kuid_t n_uname, char *aname) 1104 { 1105 int err = 0; 1106 struct p9_req_t *req; 1107 struct p9_fid *fid; 1108 struct p9_qid qid; 1109 1110 1111 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1112 afid ? afid->fid : -1, uname, aname); 1113 fid = p9_fid_create(clnt); 1114 if (IS_ERR(fid)) { 1115 err = PTR_ERR(fid); 1116 fid = NULL; 1117 goto error; 1118 } 1119 1120 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1121 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1122 if (IS_ERR(req)) { 1123 err = PTR_ERR(req); 1124 goto error; 1125 } 1126 1127 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 1128 if (err) { 1129 trace_9p_protocol_dump(clnt, req->rc); 1130 p9_free_req(clnt, req); 1131 goto error; 1132 } 1133 1134 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1135 qid.type, (unsigned long long)qid.path, qid.version); 1136 1137 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1138 1139 p9_free_req(clnt, req); 1140 return fid; 1141 1142 error: 1143 if (fid) 1144 p9_fid_destroy(fid); 1145 return ERR_PTR(err); 1146 } 1147 EXPORT_SYMBOL(p9_client_attach); 1148 1149 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1150 char **wnames, int clone) 1151 { 1152 int err; 1153 struct p9_client *clnt; 1154 struct p9_fid *fid; 1155 struct p9_qid *wqids; 1156 struct p9_req_t *req; 1157 uint16_t nwqids, count; 1158 1159 err = 0; 1160 wqids = NULL; 1161 clnt = oldfid->clnt; 1162 if (clone) { 1163 fid = p9_fid_create(clnt); 1164 if (IS_ERR(fid)) { 1165 err = PTR_ERR(fid); 1166 fid = NULL; 1167 goto error; 1168 } 1169 1170 fid->uid = oldfid->uid; 1171 } else 1172 fid = oldfid; 1173 1174 1175 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1176 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1177 1178 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1179 nwname, wnames); 1180 if (IS_ERR(req)) { 1181 err = PTR_ERR(req); 1182 goto error; 1183 } 1184 1185 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1186 if (err) { 1187 trace_9p_protocol_dump(clnt, req->rc); 1188 p9_free_req(clnt, req); 1189 goto clunk_fid; 1190 } 1191 p9_free_req(clnt, req); 1192 1193 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1194 1195 if (nwqids != nwname) { 1196 err = -ENOENT; 1197 goto clunk_fid; 1198 } 1199 1200 for (count = 0; count < nwqids; count++) 1201 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1202 count, wqids[count].type, 1203 (unsigned long long)wqids[count].path, 1204 wqids[count].version); 1205 1206 if (nwname) 1207 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1208 else 1209 fid->qid = oldfid->qid; 1210 1211 kfree(wqids); 1212 return fid; 1213 1214 clunk_fid: 1215 kfree(wqids); 1216 p9_client_clunk(fid); 1217 fid = NULL; 1218 1219 error: 1220 if (fid && (fid != oldfid)) 1221 p9_fid_destroy(fid); 1222 1223 return ERR_PTR(err); 1224 } 1225 EXPORT_SYMBOL(p9_client_walk); 1226 1227 int p9_client_open(struct p9_fid *fid, int mode) 1228 { 1229 int err; 1230 struct p9_client *clnt; 1231 struct p9_req_t *req; 1232 struct p9_qid qid; 1233 int iounit; 1234 1235 clnt = fid->clnt; 1236 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1237 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1238 err = 0; 1239 1240 if (fid->mode != -1) 1241 return -EINVAL; 1242 1243 if (p9_is_proto_dotl(clnt)) 1244 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1245 else 1246 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1247 if (IS_ERR(req)) { 1248 err = PTR_ERR(req); 1249 goto error; 1250 } 1251 1252 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1253 if (err) { 1254 trace_9p_protocol_dump(clnt, req->rc); 1255 goto free_and_error; 1256 } 1257 1258 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1259 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1260 (unsigned long long)qid.path, qid.version, iounit); 1261 1262 fid->mode = mode; 1263 fid->iounit = iounit; 1264 1265 free_and_error: 1266 p9_free_req(clnt, req); 1267 error: 1268 return err; 1269 } 1270 EXPORT_SYMBOL(p9_client_open); 1271 1272 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode, 1273 kgid_t gid, struct p9_qid *qid) 1274 { 1275 int err = 0; 1276 struct p9_client *clnt; 1277 struct p9_req_t *req; 1278 int iounit; 1279 1280 p9_debug(P9_DEBUG_9P, 1281 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1282 ofid->fid, name, flags, mode, 1283 from_kgid(&init_user_ns, gid)); 1284 clnt = ofid->clnt; 1285 1286 if (ofid->mode != -1) 1287 return -EINVAL; 1288 1289 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1290 mode, gid); 1291 if (IS_ERR(req)) { 1292 err = PTR_ERR(req); 1293 goto error; 1294 } 1295 1296 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1297 if (err) { 1298 trace_9p_protocol_dump(clnt, req->rc); 1299 goto free_and_error; 1300 } 1301 1302 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1303 qid->type, 1304 (unsigned long long)qid->path, 1305 qid->version, iounit); 1306 1307 ofid->mode = mode; 1308 ofid->iounit = iounit; 1309 1310 free_and_error: 1311 p9_free_req(clnt, req); 1312 error: 1313 return err; 1314 } 1315 EXPORT_SYMBOL(p9_client_create_dotl); 1316 1317 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, 1318 char *extension) 1319 { 1320 int err; 1321 struct p9_client *clnt; 1322 struct p9_req_t *req; 1323 struct p9_qid qid; 1324 int iounit; 1325 1326 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1327 fid->fid, name, perm, mode); 1328 err = 0; 1329 clnt = fid->clnt; 1330 1331 if (fid->mode != -1) 1332 return -EINVAL; 1333 1334 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1335 mode, extension); 1336 if (IS_ERR(req)) { 1337 err = PTR_ERR(req); 1338 goto error; 1339 } 1340 1341 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1342 if (err) { 1343 trace_9p_protocol_dump(clnt, req->rc); 1344 goto free_and_error; 1345 } 1346 1347 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1348 qid.type, 1349 (unsigned long long)qid.path, 1350 qid.version, iounit); 1351 1352 fid->mode = mode; 1353 fid->iounit = iounit; 1354 1355 free_and_error: 1356 p9_free_req(clnt, req); 1357 error: 1358 return err; 1359 } 1360 EXPORT_SYMBOL(p9_client_fcreate); 1361 1362 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid, 1363 struct p9_qid *qid) 1364 { 1365 int err = 0; 1366 struct p9_client *clnt; 1367 struct p9_req_t *req; 1368 1369 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1370 dfid->fid, name, symtgt); 1371 clnt = dfid->clnt; 1372 1373 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1374 gid); 1375 if (IS_ERR(req)) { 1376 err = PTR_ERR(req); 1377 goto error; 1378 } 1379 1380 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1381 if (err) { 1382 trace_9p_protocol_dump(clnt, req->rc); 1383 goto free_and_error; 1384 } 1385 1386 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1387 qid->type, (unsigned long long)qid->path, qid->version); 1388 1389 free_and_error: 1390 p9_free_req(clnt, req); 1391 error: 1392 return err; 1393 } 1394 EXPORT_SYMBOL(p9_client_symlink); 1395 1396 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname) 1397 { 1398 struct p9_client *clnt; 1399 struct p9_req_t *req; 1400 1401 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1402 dfid->fid, oldfid->fid, newname); 1403 clnt = dfid->clnt; 1404 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1405 newname); 1406 if (IS_ERR(req)) 1407 return PTR_ERR(req); 1408 1409 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1410 p9_free_req(clnt, req); 1411 return 0; 1412 } 1413 EXPORT_SYMBOL(p9_client_link); 1414 1415 int p9_client_fsync(struct p9_fid *fid, int datasync) 1416 { 1417 int err; 1418 struct p9_client *clnt; 1419 struct p9_req_t *req; 1420 1421 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1422 fid->fid, datasync); 1423 err = 0; 1424 clnt = fid->clnt; 1425 1426 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1427 if (IS_ERR(req)) { 1428 err = PTR_ERR(req); 1429 goto error; 1430 } 1431 1432 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1433 1434 p9_free_req(clnt, req); 1435 1436 error: 1437 return err; 1438 } 1439 EXPORT_SYMBOL(p9_client_fsync); 1440 1441 int p9_client_clunk(struct p9_fid *fid) 1442 { 1443 int err; 1444 struct p9_client *clnt; 1445 struct p9_req_t *req; 1446 int retries = 0; 1447 1448 if (!fid) { 1449 pr_warn("%s (%d): Trying to clunk with NULL fid\n", 1450 __func__, task_pid_nr(current)); 1451 dump_stack(); 1452 return 0; 1453 } 1454 1455 again: 1456 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1457 retries); 1458 err = 0; 1459 clnt = fid->clnt; 1460 1461 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1462 if (IS_ERR(req)) { 1463 err = PTR_ERR(req); 1464 goto error; 1465 } 1466 1467 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1468 1469 p9_free_req(clnt, req); 1470 error: 1471 /* 1472 * Fid is not valid even after a failed clunk 1473 * If interrupted, retry once then give up and 1474 * leak fid until umount. 1475 */ 1476 if (err == -ERESTARTSYS) { 1477 if (retries++ == 0) 1478 goto again; 1479 } else 1480 p9_fid_destroy(fid); 1481 return err; 1482 } 1483 EXPORT_SYMBOL(p9_client_clunk); 1484 1485 int p9_client_remove(struct p9_fid *fid) 1486 { 1487 int err; 1488 struct p9_client *clnt; 1489 struct p9_req_t *req; 1490 1491 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1492 err = 0; 1493 clnt = fid->clnt; 1494 1495 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1496 if (IS_ERR(req)) { 1497 err = PTR_ERR(req); 1498 goto error; 1499 } 1500 1501 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1502 1503 p9_free_req(clnt, req); 1504 error: 1505 if (err == -ERESTARTSYS) 1506 p9_client_clunk(fid); 1507 else 1508 p9_fid_destroy(fid); 1509 return err; 1510 } 1511 EXPORT_SYMBOL(p9_client_remove); 1512 1513 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1514 { 1515 int err = 0; 1516 struct p9_req_t *req; 1517 struct p9_client *clnt; 1518 1519 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1520 dfid->fid, name, flags); 1521 1522 clnt = dfid->clnt; 1523 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1524 if (IS_ERR(req)) { 1525 err = PTR_ERR(req); 1526 goto error; 1527 } 1528 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1529 1530 p9_free_req(clnt, req); 1531 error: 1532 return err; 1533 } 1534 EXPORT_SYMBOL(p9_client_unlinkat); 1535 1536 int 1537 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, 1538 u32 count) 1539 { 1540 char *dataptr; 1541 int kernel_buf = 0; 1542 struct p9_req_t *req; 1543 struct p9_client *clnt; 1544 int err, rsize, non_zc = 0; 1545 1546 1547 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1548 fid->fid, (unsigned long long) offset, count); 1549 err = 0; 1550 clnt = fid->clnt; 1551 1552 rsize = fid->iounit; 1553 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1554 rsize = clnt->msize - P9_IOHDRSZ; 1555 1556 if (count < rsize) 1557 rsize = count; 1558 1559 /* Don't bother zerocopy for small IO (< 1024) */ 1560 if (clnt->trans_mod->zc_request && rsize > 1024) { 1561 char *indata; 1562 if (data) { 1563 kernel_buf = 1; 1564 indata = data; 1565 } else 1566 indata = (__force char *)udata; 1567 /* 1568 * response header len is 11 1569 * PDU Header(7) + IO Size (4) 1570 */ 1571 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0, 1572 11, kernel_buf, "dqd", fid->fid, 1573 offset, rsize); 1574 } else { 1575 non_zc = 1; 1576 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1577 rsize); 1578 } 1579 if (IS_ERR(req)) { 1580 err = PTR_ERR(req); 1581 goto error; 1582 } 1583 1584 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1585 if (err) { 1586 trace_9p_protocol_dump(clnt, req->rc); 1587 goto free_and_error; 1588 } 1589 1590 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1591 1592 if (non_zc) { 1593 if (data) { 1594 memmove(data, dataptr, count); 1595 } else { 1596 err = copy_to_user(udata, dataptr, count); 1597 if (err) { 1598 err = -EFAULT; 1599 goto free_and_error; 1600 } 1601 } 1602 } 1603 p9_free_req(clnt, req); 1604 return count; 1605 1606 free_and_error: 1607 p9_free_req(clnt, req); 1608 error: 1609 return err; 1610 } 1611 EXPORT_SYMBOL(p9_client_read); 1612 1613 int 1614 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, 1615 u64 offset, u32 count) 1616 { 1617 int err, rsize; 1618 int kernel_buf = 0; 1619 struct p9_client *clnt; 1620 struct p9_req_t *req; 1621 1622 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", 1623 fid->fid, (unsigned long long) offset, count); 1624 err = 0; 1625 clnt = fid->clnt; 1626 1627 rsize = fid->iounit; 1628 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1629 rsize = clnt->msize - P9_IOHDRSZ; 1630 1631 if (count < rsize) 1632 rsize = count; 1633 1634 /* Don't bother zerocopy for small IO (< 1024) */ 1635 if (clnt->trans_mod->zc_request && rsize > 1024) { 1636 char *odata; 1637 if (data) { 1638 kernel_buf = 1; 1639 odata = data; 1640 } else 1641 odata = (char *)udata; 1642 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize, 1643 P9_ZC_HDR_SZ, kernel_buf, "dqd", 1644 fid->fid, offset, rsize); 1645 } else { 1646 if (data) 1647 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, 1648 offset, rsize, data); 1649 else 1650 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, 1651 offset, rsize, udata); 1652 } 1653 if (IS_ERR(req)) { 1654 err = PTR_ERR(req); 1655 goto error; 1656 } 1657 1658 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1659 if (err) { 1660 trace_9p_protocol_dump(clnt, req->rc); 1661 goto free_and_error; 1662 } 1663 1664 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1665 1666 p9_free_req(clnt, req); 1667 return count; 1668 1669 free_and_error: 1670 p9_free_req(clnt, req); 1671 error: 1672 return err; 1673 } 1674 EXPORT_SYMBOL(p9_client_write); 1675 1676 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1677 { 1678 int err; 1679 struct p9_client *clnt; 1680 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1681 struct p9_req_t *req; 1682 u16 ignored; 1683 1684 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1685 1686 if (!ret) 1687 return ERR_PTR(-ENOMEM); 1688 1689 err = 0; 1690 clnt = fid->clnt; 1691 1692 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1693 if (IS_ERR(req)) { 1694 err = PTR_ERR(req); 1695 goto error; 1696 } 1697 1698 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1699 if (err) { 1700 trace_9p_protocol_dump(clnt, req->rc); 1701 p9_free_req(clnt, req); 1702 goto error; 1703 } 1704 1705 p9_debug(P9_DEBUG_9P, 1706 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1707 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1708 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1709 "<<< uid=%d gid=%d n_muid=%d\n", 1710 ret->size, ret->type, ret->dev, ret->qid.type, 1711 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1712 ret->atime, ret->mtime, (unsigned long long)ret->length, 1713 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1714 from_kuid(&init_user_ns, ret->n_uid), 1715 from_kgid(&init_user_ns, ret->n_gid), 1716 from_kuid(&init_user_ns, ret->n_muid)); 1717 1718 p9_free_req(clnt, req); 1719 return ret; 1720 1721 error: 1722 kfree(ret); 1723 return ERR_PTR(err); 1724 } 1725 EXPORT_SYMBOL(p9_client_stat); 1726 1727 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1728 u64 request_mask) 1729 { 1730 int err; 1731 struct p9_client *clnt; 1732 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1733 GFP_KERNEL); 1734 struct p9_req_t *req; 1735 1736 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1737 fid->fid, request_mask); 1738 1739 if (!ret) 1740 return ERR_PTR(-ENOMEM); 1741 1742 err = 0; 1743 clnt = fid->clnt; 1744 1745 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1746 if (IS_ERR(req)) { 1747 err = PTR_ERR(req); 1748 goto error; 1749 } 1750 1751 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1752 if (err) { 1753 trace_9p_protocol_dump(clnt, req->rc); 1754 p9_free_req(clnt, req); 1755 goto error; 1756 } 1757 1758 p9_debug(P9_DEBUG_9P, 1759 "<<< RGETATTR st_result_mask=%lld\n" 1760 "<<< qid=%x.%llx.%x\n" 1761 "<<< st_mode=%8.8x st_nlink=%llu\n" 1762 "<<< st_uid=%d st_gid=%d\n" 1763 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1764 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1765 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1766 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1767 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1768 "<<< st_gen=%lld st_data_version=%lld", 1769 ret->st_result_mask, ret->qid.type, ret->qid.path, 1770 ret->qid.version, ret->st_mode, ret->st_nlink, 1771 from_kuid(&init_user_ns, ret->st_uid), 1772 from_kgid(&init_user_ns, ret->st_gid), 1773 ret->st_rdev, ret->st_size, ret->st_blksize, 1774 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1775 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1776 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1777 ret->st_gen, ret->st_data_version); 1778 1779 p9_free_req(clnt, req); 1780 return ret; 1781 1782 error: 1783 kfree(ret); 1784 return ERR_PTR(err); 1785 } 1786 EXPORT_SYMBOL(p9_client_getattr_dotl); 1787 1788 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1789 { 1790 int ret; 1791 1792 /* NOTE: size shouldn't include its own length */ 1793 /* size[2] type[2] dev[4] qid[13] */ 1794 /* mode[4] atime[4] mtime[4] length[8]*/ 1795 /* name[s] uid[s] gid[s] muid[s] */ 1796 ret = 2+4+13+4+4+4+8+2+2+2+2; 1797 1798 if (wst->name) 1799 ret += strlen(wst->name); 1800 if (wst->uid) 1801 ret += strlen(wst->uid); 1802 if (wst->gid) 1803 ret += strlen(wst->gid); 1804 if (wst->muid) 1805 ret += strlen(wst->muid); 1806 1807 if ((proto_version == p9_proto_2000u) || 1808 (proto_version == p9_proto_2000L)) { 1809 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1810 if (wst->extension) 1811 ret += strlen(wst->extension); 1812 } 1813 1814 return ret; 1815 } 1816 1817 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1818 { 1819 int err; 1820 struct p9_req_t *req; 1821 struct p9_client *clnt; 1822 1823 err = 0; 1824 clnt = fid->clnt; 1825 wst->size = p9_client_statsize(wst, clnt->proto_version); 1826 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1827 p9_debug(P9_DEBUG_9P, 1828 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1829 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1830 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1831 " uid=%d gid=%d n_muid=%d\n", 1832 wst->size, wst->type, wst->dev, wst->qid.type, 1833 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1834 wst->atime, wst->mtime, (unsigned long long)wst->length, 1835 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1836 from_kuid(&init_user_ns, wst->n_uid), 1837 from_kgid(&init_user_ns, wst->n_gid), 1838 from_kuid(&init_user_ns, wst->n_muid)); 1839 1840 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1841 if (IS_ERR(req)) { 1842 err = PTR_ERR(req); 1843 goto error; 1844 } 1845 1846 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1847 1848 p9_free_req(clnt, req); 1849 error: 1850 return err; 1851 } 1852 EXPORT_SYMBOL(p9_client_wstat); 1853 1854 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1855 { 1856 int err; 1857 struct p9_req_t *req; 1858 struct p9_client *clnt; 1859 1860 err = 0; 1861 clnt = fid->clnt; 1862 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1863 p9_debug(P9_DEBUG_9P, 1864 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1865 " atime_sec=%lld atime_nsec=%lld\n" 1866 " mtime_sec=%lld mtime_nsec=%lld\n", 1867 p9attr->valid, p9attr->mode, 1868 from_kuid(&init_user_ns, p9attr->uid), 1869 from_kgid(&init_user_ns, p9attr->gid), 1870 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1871 p9attr->mtime_sec, p9attr->mtime_nsec); 1872 1873 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1874 1875 if (IS_ERR(req)) { 1876 err = PTR_ERR(req); 1877 goto error; 1878 } 1879 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1880 p9_free_req(clnt, req); 1881 error: 1882 return err; 1883 } 1884 EXPORT_SYMBOL(p9_client_setattr); 1885 1886 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1887 { 1888 int err; 1889 struct p9_req_t *req; 1890 struct p9_client *clnt; 1891 1892 err = 0; 1893 clnt = fid->clnt; 1894 1895 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1896 1897 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1898 if (IS_ERR(req)) { 1899 err = PTR_ERR(req); 1900 goto error; 1901 } 1902 1903 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1904 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1905 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1906 if (err) { 1907 trace_9p_protocol_dump(clnt, req->rc); 1908 p9_free_req(clnt, req); 1909 goto error; 1910 } 1911 1912 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1913 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1914 "fsid %llu namelen %ld\n", 1915 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1916 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1917 sb->fsid, (long int)sb->namelen); 1918 1919 p9_free_req(clnt, req); 1920 error: 1921 return err; 1922 } 1923 EXPORT_SYMBOL(p9_client_statfs); 1924 1925 int p9_client_rename(struct p9_fid *fid, 1926 struct p9_fid *newdirfid, const char *name) 1927 { 1928 int err; 1929 struct p9_req_t *req; 1930 struct p9_client *clnt; 1931 1932 err = 0; 1933 clnt = fid->clnt; 1934 1935 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1936 fid->fid, newdirfid->fid, name); 1937 1938 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1939 newdirfid->fid, name); 1940 if (IS_ERR(req)) { 1941 err = PTR_ERR(req); 1942 goto error; 1943 } 1944 1945 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1946 1947 p9_free_req(clnt, req); 1948 error: 1949 return err; 1950 } 1951 EXPORT_SYMBOL(p9_client_rename); 1952 1953 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1954 struct p9_fid *newdirfid, const char *new_name) 1955 { 1956 int err; 1957 struct p9_req_t *req; 1958 struct p9_client *clnt; 1959 1960 err = 0; 1961 clnt = olddirfid->clnt; 1962 1963 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1964 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1965 newdirfid->fid, new_name); 1966 1967 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1968 old_name, newdirfid->fid, new_name); 1969 if (IS_ERR(req)) { 1970 err = PTR_ERR(req); 1971 goto error; 1972 } 1973 1974 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1975 newdirfid->fid, new_name); 1976 1977 p9_free_req(clnt, req); 1978 error: 1979 return err; 1980 } 1981 EXPORT_SYMBOL(p9_client_renameat); 1982 1983 /* 1984 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1985 */ 1986 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1987 const char *attr_name, u64 *attr_size) 1988 { 1989 int err; 1990 struct p9_req_t *req; 1991 struct p9_client *clnt; 1992 struct p9_fid *attr_fid; 1993 1994 err = 0; 1995 clnt = file_fid->clnt; 1996 attr_fid = p9_fid_create(clnt); 1997 if (IS_ERR(attr_fid)) { 1998 err = PTR_ERR(attr_fid); 1999 attr_fid = NULL; 2000 goto error; 2001 } 2002 p9_debug(P9_DEBUG_9P, 2003 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2004 file_fid->fid, attr_fid->fid, attr_name); 2005 2006 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2007 file_fid->fid, attr_fid->fid, attr_name); 2008 if (IS_ERR(req)) { 2009 err = PTR_ERR(req); 2010 goto error; 2011 } 2012 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 2013 if (err) { 2014 trace_9p_protocol_dump(clnt, req->rc); 2015 p9_free_req(clnt, req); 2016 goto clunk_fid; 2017 } 2018 p9_free_req(clnt, req); 2019 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2020 attr_fid->fid, *attr_size); 2021 return attr_fid; 2022 clunk_fid: 2023 p9_client_clunk(attr_fid); 2024 attr_fid = NULL; 2025 error: 2026 if (attr_fid && (attr_fid != file_fid)) 2027 p9_fid_destroy(attr_fid); 2028 2029 return ERR_PTR(err); 2030 } 2031 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2032 2033 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2034 u64 attr_size, int flags) 2035 { 2036 int err; 2037 struct p9_req_t *req; 2038 struct p9_client *clnt; 2039 2040 p9_debug(P9_DEBUG_9P, 2041 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2042 fid->fid, name, (long long)attr_size, flags); 2043 err = 0; 2044 clnt = fid->clnt; 2045 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2046 fid->fid, name, attr_size, flags); 2047 if (IS_ERR(req)) { 2048 err = PTR_ERR(req); 2049 goto error; 2050 } 2051 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2052 p9_free_req(clnt, req); 2053 error: 2054 return err; 2055 } 2056 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2057 2058 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2059 { 2060 int err, rsize, non_zc = 0; 2061 struct p9_client *clnt; 2062 struct p9_req_t *req; 2063 char *dataptr; 2064 2065 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2066 fid->fid, (unsigned long long) offset, count); 2067 2068 err = 0; 2069 clnt = fid->clnt; 2070 2071 rsize = fid->iounit; 2072 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2073 rsize = clnt->msize - P9_READDIRHDRSZ; 2074 2075 if (count < rsize) 2076 rsize = count; 2077 2078 /* Don't bother zerocopy for small IO (< 1024) */ 2079 if (clnt->trans_mod->zc_request && rsize > 1024) { 2080 /* 2081 * response header len is 11 2082 * PDU Header(7) + IO Size (4) 2083 */ 2084 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0, 2085 11, 1, "dqd", fid->fid, offset, rsize); 2086 } else { 2087 non_zc = 1; 2088 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2089 offset, rsize); 2090 } 2091 if (IS_ERR(req)) { 2092 err = PTR_ERR(req); 2093 goto error; 2094 } 2095 2096 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 2097 if (err) { 2098 trace_9p_protocol_dump(clnt, req->rc); 2099 goto free_and_error; 2100 } 2101 2102 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2103 2104 if (non_zc) 2105 memmove(data, dataptr, count); 2106 2107 p9_free_req(clnt, req); 2108 return count; 2109 2110 free_and_error: 2111 p9_free_req(clnt, req); 2112 error: 2113 return err; 2114 } 2115 EXPORT_SYMBOL(p9_client_readdir); 2116 2117 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode, 2118 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2119 { 2120 int err; 2121 struct p9_client *clnt; 2122 struct p9_req_t *req; 2123 2124 err = 0; 2125 clnt = fid->clnt; 2126 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2127 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2128 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2129 MAJOR(rdev), MINOR(rdev), gid); 2130 if (IS_ERR(req)) 2131 return PTR_ERR(req); 2132 2133 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2134 if (err) { 2135 trace_9p_protocol_dump(clnt, req->rc); 2136 goto error; 2137 } 2138 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2139 (unsigned long long)qid->path, qid->version); 2140 2141 error: 2142 p9_free_req(clnt, req); 2143 return err; 2144 2145 } 2146 EXPORT_SYMBOL(p9_client_mknod_dotl); 2147 2148 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode, 2149 kgid_t gid, struct p9_qid *qid) 2150 { 2151 int err; 2152 struct p9_client *clnt; 2153 struct p9_req_t *req; 2154 2155 err = 0; 2156 clnt = fid->clnt; 2157 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2158 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2159 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2160 gid); 2161 if (IS_ERR(req)) 2162 return PTR_ERR(req); 2163 2164 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2165 if (err) { 2166 trace_9p_protocol_dump(clnt, req->rc); 2167 goto error; 2168 } 2169 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2170 (unsigned long long)qid->path, qid->version); 2171 2172 error: 2173 p9_free_req(clnt, req); 2174 return err; 2175 2176 } 2177 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2178 2179 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2180 { 2181 int err; 2182 struct p9_client *clnt; 2183 struct p9_req_t *req; 2184 2185 err = 0; 2186 clnt = fid->clnt; 2187 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2188 "start %lld length %lld proc_id %d client_id %s\n", 2189 fid->fid, flock->type, flock->flags, flock->start, 2190 flock->length, flock->proc_id, flock->client_id); 2191 2192 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2193 flock->flags, flock->start, flock->length, 2194 flock->proc_id, flock->client_id); 2195 2196 if (IS_ERR(req)) 2197 return PTR_ERR(req); 2198 2199 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); 2200 if (err) { 2201 trace_9p_protocol_dump(clnt, req->rc); 2202 goto error; 2203 } 2204 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2205 error: 2206 p9_free_req(clnt, req); 2207 return err; 2208 2209 } 2210 EXPORT_SYMBOL(p9_client_lock_dotl); 2211 2212 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2213 { 2214 int err; 2215 struct p9_client *clnt; 2216 struct p9_req_t *req; 2217 2218 err = 0; 2219 clnt = fid->clnt; 2220 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2221 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2222 glock->start, glock->length, glock->proc_id, glock->client_id); 2223 2224 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2225 glock->start, glock->length, glock->proc_id, glock->client_id); 2226 2227 if (IS_ERR(req)) 2228 return PTR_ERR(req); 2229 2230 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, 2231 &glock->start, &glock->length, &glock->proc_id, 2232 &glock->client_id); 2233 if (err) { 2234 trace_9p_protocol_dump(clnt, req->rc); 2235 goto error; 2236 } 2237 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2238 "proc_id %d client_id %s\n", glock->type, glock->start, 2239 glock->length, glock->proc_id, glock->client_id); 2240 error: 2241 p9_free_req(clnt, req); 2242 return err; 2243 } 2244 EXPORT_SYMBOL(p9_client_getlock_dotl); 2245 2246 int p9_client_readlink(struct p9_fid *fid, char **target) 2247 { 2248 int err; 2249 struct p9_client *clnt; 2250 struct p9_req_t *req; 2251 2252 err = 0; 2253 clnt = fid->clnt; 2254 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2255 2256 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2257 if (IS_ERR(req)) 2258 return PTR_ERR(req); 2259 2260 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); 2261 if (err) { 2262 trace_9p_protocol_dump(clnt, req->rc); 2263 goto error; 2264 } 2265 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2266 error: 2267 p9_free_req(clnt, req); 2268 return err; 2269 } 2270 EXPORT_SYMBOL(p9_client_readlink); 2271