1 /* 2 * net/9p/clnt.c 3 * 4 * 9P Client 5 * 6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> 7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 11 * as published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to: 20 * Free Software Foundation 21 * 51 Franklin Street, Fifth Floor 22 * Boston, MA 02111-1301 USA 23 * 24 */ 25 26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 27 28 #include <linux/module.h> 29 #include <linux/errno.h> 30 #include <linux/fs.h> 31 #include <linux/poll.h> 32 #include <linux/idr.h> 33 #include <linux/mutex.h> 34 #include <linux/slab.h> 35 #include <linux/sched.h> 36 #include <linux/uaccess.h> 37 #include <net/9p/9p.h> 38 #include <linux/parser.h> 39 #include <net/9p/client.h> 40 #include <net/9p/transport.h> 41 #include "protocol.h" 42 43 #define CREATE_TRACE_POINTS 44 #include <trace/events/9p.h> 45 46 /* 47 * Client Option Parsing (code inspired by NFS code) 48 * - a little lazy - parse all client options 49 */ 50 51 enum { 52 Opt_msize, 53 Opt_trans, 54 Opt_legacy, 55 Opt_version, 56 Opt_err, 57 }; 58 59 static const match_table_t tokens = { 60 {Opt_msize, "msize=%u"}, 61 {Opt_legacy, "noextend"}, 62 {Opt_trans, "trans=%s"}, 63 {Opt_version, "version=%s"}, 64 {Opt_err, NULL}, 65 }; 66 67 inline int p9_is_proto_dotl(struct p9_client *clnt) 68 { 69 return clnt->proto_version == p9_proto_2000L; 70 } 71 EXPORT_SYMBOL(p9_is_proto_dotl); 72 73 inline int p9_is_proto_dotu(struct p9_client *clnt) 74 { 75 return clnt->proto_version == p9_proto_2000u; 76 } 77 EXPORT_SYMBOL(p9_is_proto_dotu); 78 79 /* 80 * Some error codes are taken directly from the server replies, 81 * make sure they are valid. 82 */ 83 static int safe_errno(int err) 84 { 85 if ((err > 0) || (err < -MAX_ERRNO)) { 86 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 87 return -EPROTO; 88 } 89 return err; 90 } 91 92 93 /* Interpret mount option for protocol version */ 94 static int get_protocol_version(char *s) 95 { 96 int version = -EINVAL; 97 98 if (!strcmp(s, "9p2000")) { 99 version = p9_proto_legacy; 100 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 101 } else if (!strcmp(s, "9p2000.u")) { 102 version = p9_proto_2000u; 103 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 104 } else if (!strcmp(s, "9p2000.L")) { 105 version = p9_proto_2000L; 106 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 107 } else 108 pr_info("Unknown protocol version %s\n", s); 109 110 return version; 111 } 112 113 /** 114 * parse_options - parse mount options into client structure 115 * @opts: options string passed from mount 116 * @clnt: existing v9fs client information 117 * 118 * Return 0 upon success, -ERRNO upon failure 119 */ 120 121 static int parse_opts(char *opts, struct p9_client *clnt) 122 { 123 char *options, *tmp_options; 124 char *p; 125 substring_t args[MAX_OPT_ARGS]; 126 int option; 127 char *s; 128 int ret = 0; 129 130 clnt->proto_version = p9_proto_2000L; 131 clnt->msize = 8192; 132 133 if (!opts) 134 return 0; 135 136 tmp_options = kstrdup(opts, GFP_KERNEL); 137 if (!tmp_options) { 138 p9_debug(P9_DEBUG_ERROR, 139 "failed to allocate copy of option string\n"); 140 return -ENOMEM; 141 } 142 options = tmp_options; 143 144 while ((p = strsep(&options, ",")) != NULL) { 145 int token, r; 146 if (!*p) 147 continue; 148 token = match_token(p, tokens, args); 149 switch (token) { 150 case Opt_msize: 151 r = match_int(&args[0], &option); 152 if (r < 0) { 153 p9_debug(P9_DEBUG_ERROR, 154 "integer field, but no integer?\n"); 155 ret = r; 156 continue; 157 } 158 clnt->msize = option; 159 break; 160 case Opt_trans: 161 s = match_strdup(&args[0]); 162 if (!s) { 163 ret = -ENOMEM; 164 p9_debug(P9_DEBUG_ERROR, 165 "problem allocating copy of trans arg\n"); 166 goto free_and_return; 167 } 168 clnt->trans_mod = v9fs_get_trans_by_name(s); 169 if (clnt->trans_mod == NULL) { 170 pr_info("Could not find request transport: %s\n", 171 s); 172 ret = -EINVAL; 173 kfree(s); 174 goto free_and_return; 175 } 176 kfree(s); 177 break; 178 case Opt_legacy: 179 clnt->proto_version = p9_proto_legacy; 180 break; 181 case Opt_version: 182 s = match_strdup(&args[0]); 183 if (!s) { 184 ret = -ENOMEM; 185 p9_debug(P9_DEBUG_ERROR, 186 "problem allocating copy of version arg\n"); 187 goto free_and_return; 188 } 189 ret = get_protocol_version(s); 190 if (ret == -EINVAL) { 191 kfree(s); 192 goto free_and_return; 193 } 194 kfree(s); 195 clnt->proto_version = ret; 196 break; 197 default: 198 continue; 199 } 200 } 201 202 free_and_return: 203 kfree(tmp_options); 204 return ret; 205 } 206 207 static struct p9_fcall *p9_fcall_alloc(int alloc_msize) 208 { 209 struct p9_fcall *fc; 210 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS); 211 if (!fc) 212 return NULL; 213 fc->capacity = alloc_msize; 214 fc->sdata = (char *) fc + sizeof(struct p9_fcall); 215 return fc; 216 } 217 218 /** 219 * p9_tag_alloc - lookup/allocate a request by tag 220 * @c: client session to lookup tag within 221 * @tag: numeric id for transaction 222 * 223 * this is a simple array lookup, but will grow the 224 * request_slots as necessary to accommodate transaction 225 * ids which did not previously have a slot. 226 * 227 * this code relies on the client spinlock to manage locks, its 228 * possible we should switch to something else, but I'd rather 229 * stick with something low-overhead for the common case. 230 * 231 */ 232 233 static struct p9_req_t * 234 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size) 235 { 236 unsigned long flags; 237 int row, col; 238 struct p9_req_t *req; 239 int alloc_msize = min(c->msize, max_size); 240 241 /* This looks up the original request by tag so we know which 242 * buffer to read the data into */ 243 tag++; 244 245 if (tag >= c->max_tag) { 246 spin_lock_irqsave(&c->lock, flags); 247 /* check again since original check was outside of lock */ 248 while (tag >= c->max_tag) { 249 row = (tag / P9_ROW_MAXTAG); 250 c->reqs[row] = kcalloc(P9_ROW_MAXTAG, 251 sizeof(struct p9_req_t), GFP_ATOMIC); 252 253 if (!c->reqs[row]) { 254 pr_err("Couldn't grow tag array\n"); 255 spin_unlock_irqrestore(&c->lock, flags); 256 return ERR_PTR(-ENOMEM); 257 } 258 for (col = 0; col < P9_ROW_MAXTAG; col++) { 259 c->reqs[row][col].status = REQ_STATUS_IDLE; 260 c->reqs[row][col].tc = NULL; 261 } 262 c->max_tag += P9_ROW_MAXTAG; 263 } 264 spin_unlock_irqrestore(&c->lock, flags); 265 } 266 row = tag / P9_ROW_MAXTAG; 267 col = tag % P9_ROW_MAXTAG; 268 269 req = &c->reqs[row][col]; 270 if (!req->wq) { 271 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS); 272 if (!req->wq) 273 goto grow_failed; 274 init_waitqueue_head(req->wq); 275 } 276 277 if (!req->tc) 278 req->tc = p9_fcall_alloc(alloc_msize); 279 if (!req->rc) 280 req->rc = p9_fcall_alloc(alloc_msize); 281 if (!req->tc || !req->rc) 282 goto grow_failed; 283 284 p9pdu_reset(req->tc); 285 p9pdu_reset(req->rc); 286 287 req->tc->tag = tag-1; 288 req->status = REQ_STATUS_ALLOC; 289 290 return req; 291 292 grow_failed: 293 pr_err("Couldn't grow tag array\n"); 294 kfree(req->tc); 295 kfree(req->rc); 296 kfree(req->wq); 297 req->tc = req->rc = NULL; 298 req->wq = NULL; 299 return ERR_PTR(-ENOMEM); 300 } 301 302 /** 303 * p9_tag_lookup - lookup a request by tag 304 * @c: client session to lookup tag within 305 * @tag: numeric id for transaction 306 * 307 */ 308 309 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 310 { 311 int row, col; 312 313 /* This looks up the original request by tag so we know which 314 * buffer to read the data into */ 315 tag++; 316 317 if(tag >= c->max_tag) 318 return NULL; 319 320 row = tag / P9_ROW_MAXTAG; 321 col = tag % P9_ROW_MAXTAG; 322 323 return &c->reqs[row][col]; 324 } 325 EXPORT_SYMBOL(p9_tag_lookup); 326 327 /** 328 * p9_tag_init - setup tags structure and contents 329 * @c: v9fs client struct 330 * 331 * This initializes the tags structure for each client instance. 332 * 333 */ 334 335 static int p9_tag_init(struct p9_client *c) 336 { 337 int err = 0; 338 339 c->tagpool = p9_idpool_create(); 340 if (IS_ERR(c->tagpool)) { 341 err = PTR_ERR(c->tagpool); 342 goto error; 343 } 344 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */ 345 if (err < 0) { 346 p9_idpool_destroy(c->tagpool); 347 goto error; 348 } 349 c->max_tag = 0; 350 error: 351 return err; 352 } 353 354 /** 355 * p9_tag_cleanup - cleans up tags structure and reclaims resources 356 * @c: v9fs client struct 357 * 358 * This frees resources associated with the tags structure 359 * 360 */ 361 static void p9_tag_cleanup(struct p9_client *c) 362 { 363 int row, col; 364 365 /* check to insure all requests are idle */ 366 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 367 for (col = 0; col < P9_ROW_MAXTAG; col++) { 368 if (c->reqs[row][col].status != REQ_STATUS_IDLE) { 369 p9_debug(P9_DEBUG_MUX, 370 "Attempting to cleanup non-free tag %d,%d\n", 371 row, col); 372 /* TODO: delay execution of cleanup */ 373 return; 374 } 375 } 376 } 377 378 if (c->tagpool) { 379 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */ 380 p9_idpool_destroy(c->tagpool); 381 } 382 383 /* free requests associated with tags */ 384 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 385 for (col = 0; col < P9_ROW_MAXTAG; col++) { 386 kfree(c->reqs[row][col].wq); 387 kfree(c->reqs[row][col].tc); 388 kfree(c->reqs[row][col].rc); 389 } 390 kfree(c->reqs[row]); 391 } 392 c->max_tag = 0; 393 } 394 395 /** 396 * p9_free_req - free a request and clean-up as necessary 397 * c: client state 398 * r: request to release 399 * 400 */ 401 402 static void p9_free_req(struct p9_client *c, struct p9_req_t *r) 403 { 404 int tag = r->tc->tag; 405 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 406 407 r->status = REQ_STATUS_IDLE; 408 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) 409 p9_idpool_put(tag, c->tagpool); 410 } 411 412 /** 413 * p9_client_cb - call back from transport to client 414 * c: client state 415 * req: request received 416 * 417 */ 418 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 419 { 420 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); 421 422 /* 423 * This barrier is needed to make sure any change made to req before 424 * the other thread wakes up will indeed be seen by the waiting side. 425 */ 426 smp_wmb(); 427 req->status = status; 428 429 wake_up(req->wq); 430 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); 431 } 432 EXPORT_SYMBOL(p9_client_cb); 433 434 /** 435 * p9_parse_header - parse header arguments out of a packet 436 * @pdu: packet to parse 437 * @size: size of packet 438 * @type: type of request 439 * @tag: tag of packet 440 * @rewind: set if we need to rewind offset afterwards 441 */ 442 443 int 444 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 445 int rewind) 446 { 447 int8_t r_type; 448 int16_t r_tag; 449 int32_t r_size; 450 int offset = pdu->offset; 451 int err; 452 453 pdu->offset = 0; 454 if (pdu->size == 0) 455 pdu->size = 7; 456 457 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 458 if (err) 459 goto rewind_and_exit; 460 461 pdu->size = r_size; 462 pdu->id = r_type; 463 pdu->tag = r_tag; 464 465 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 466 pdu->size, pdu->id, pdu->tag); 467 468 if (type) 469 *type = r_type; 470 if (tag) 471 *tag = r_tag; 472 if (size) 473 *size = r_size; 474 475 476 rewind_and_exit: 477 if (rewind) 478 pdu->offset = offset; 479 return err; 480 } 481 EXPORT_SYMBOL(p9_parse_header); 482 483 /** 484 * p9_check_errors - check 9p packet for error return and process it 485 * @c: current client instance 486 * @req: request to parse and check for error conditions 487 * 488 * returns error code if one is discovered, otherwise returns 0 489 * 490 * this will have to be more complicated if we have multiple 491 * error packet types 492 */ 493 494 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 495 { 496 int8_t type; 497 int err; 498 int ecode; 499 500 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 501 /* 502 * dump the response from server 503 * This should be after check errors which poplulate pdu_fcall. 504 */ 505 trace_9p_protocol_dump(c, req->rc); 506 if (err) { 507 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 508 return err; 509 } 510 if (type != P9_RERROR && type != P9_RLERROR) 511 return 0; 512 513 if (!p9_is_proto_dotl(c)) { 514 char *ename; 515 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 516 &ename, &ecode); 517 if (err) 518 goto out_err; 519 520 if (p9_is_proto_dotu(c)) 521 err = -ecode; 522 523 if (!err || !IS_ERR_VALUE(err)) { 524 err = p9_errstr2errno(ename, strlen(ename)); 525 526 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 527 -ecode, ename); 528 } 529 kfree(ename); 530 } else { 531 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 532 err = -ecode; 533 534 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 535 } 536 537 return err; 538 539 out_err: 540 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 541 542 return err; 543 } 544 545 /** 546 * p9_check_zc_errors - check 9p packet for error return and process it 547 * @c: current client instance 548 * @req: request to parse and check for error conditions 549 * @in_hdrlen: Size of response protocol buffer. 550 * 551 * returns error code if one is discovered, otherwise returns 0 552 * 553 * this will have to be more complicated if we have multiple 554 * error packet types 555 */ 556 557 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 558 char *uidata, int in_hdrlen, int kern_buf) 559 { 560 int err; 561 int ecode; 562 int8_t type; 563 char *ename = NULL; 564 565 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 566 /* 567 * dump the response from server 568 * This should be after parse_header which poplulate pdu_fcall. 569 */ 570 trace_9p_protocol_dump(c, req->rc); 571 if (err) { 572 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 573 return err; 574 } 575 576 if (type != P9_RERROR && type != P9_RLERROR) 577 return 0; 578 579 if (!p9_is_proto_dotl(c)) { 580 /* Error is reported in string format */ 581 int len; 582 /* 7 = header size for RERROR; */ 583 int inline_len = in_hdrlen - 7; 584 585 len = req->rc->size - req->rc->offset; 586 if (len > (P9_ZC_HDR_SZ - 7)) { 587 err = -EFAULT; 588 goto out_err; 589 } 590 591 ename = &req->rc->sdata[req->rc->offset]; 592 if (len > inline_len) { 593 /* We have error in external buffer */ 594 if (kern_buf) { 595 memcpy(ename + inline_len, uidata, 596 len - inline_len); 597 } else { 598 err = copy_from_user(ename + inline_len, 599 uidata, len - inline_len); 600 if (err) { 601 err = -EFAULT; 602 goto out_err; 603 } 604 } 605 } 606 ename = NULL; 607 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 608 &ename, &ecode); 609 if (err) 610 goto out_err; 611 612 if (p9_is_proto_dotu(c)) 613 err = -ecode; 614 615 if (!err || !IS_ERR_VALUE(err)) { 616 err = p9_errstr2errno(ename, strlen(ename)); 617 618 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 619 -ecode, ename); 620 } 621 kfree(ename); 622 } else { 623 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 624 err = -ecode; 625 626 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 627 } 628 return err; 629 630 out_err: 631 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 632 return err; 633 } 634 635 static struct p9_req_t * 636 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 637 638 /** 639 * p9_client_flush - flush (cancel) a request 640 * @c: client state 641 * @oldreq: request to cancel 642 * 643 * This sents a flush for a particular request and links 644 * the flush request to the original request. The current 645 * code only supports a single flush request although the protocol 646 * allows for multiple flush requests to be sent for a single request. 647 * 648 */ 649 650 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 651 { 652 struct p9_req_t *req; 653 int16_t oldtag; 654 int err; 655 656 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 657 if (err) 658 return err; 659 660 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 661 662 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 663 if (IS_ERR(req)) 664 return PTR_ERR(req); 665 666 /* 667 * if we haven't received a response for oldreq, 668 * remove it from the list 669 */ 670 if (oldreq->status == REQ_STATUS_SENT) 671 if (c->trans_mod->cancelled) 672 c->trans_mod->cancelled(c, oldreq); 673 674 p9_free_req(c, req); 675 return 0; 676 } 677 678 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 679 int8_t type, int req_size, 680 const char *fmt, va_list ap) 681 { 682 int tag, err; 683 struct p9_req_t *req; 684 685 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 686 687 /* we allow for any status other than disconnected */ 688 if (c->status == Disconnected) 689 return ERR_PTR(-EIO); 690 691 /* if status is begin_disconnected we allow only clunk request */ 692 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 693 return ERR_PTR(-EIO); 694 695 tag = P9_NOTAG; 696 if (type != P9_TVERSION) { 697 tag = p9_idpool_get(c->tagpool); 698 if (tag < 0) 699 return ERR_PTR(-ENOMEM); 700 } 701 702 req = p9_tag_alloc(c, tag, req_size); 703 if (IS_ERR(req)) 704 return req; 705 706 /* marshall the data */ 707 p9pdu_prepare(req->tc, tag, type); 708 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 709 if (err) 710 goto reterr; 711 p9pdu_finalize(c, req->tc); 712 trace_9p_client_req(c, type, tag); 713 return req; 714 reterr: 715 p9_free_req(c, req); 716 return ERR_PTR(err); 717 } 718 719 /** 720 * p9_client_rpc - issue a request and wait for a response 721 * @c: client session 722 * @type: type of request 723 * @fmt: protocol format string (see protocol.c) 724 * 725 * Returns request structure (which client must free using p9_free_req) 726 */ 727 728 static struct p9_req_t * 729 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 730 { 731 va_list ap; 732 int sigpending, err; 733 unsigned long flags; 734 struct p9_req_t *req; 735 736 va_start(ap, fmt); 737 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 738 va_end(ap); 739 if (IS_ERR(req)) 740 return req; 741 742 if (signal_pending(current)) { 743 sigpending = 1; 744 clear_thread_flag(TIF_SIGPENDING); 745 } else 746 sigpending = 0; 747 748 err = c->trans_mod->request(c, req); 749 if (err < 0) { 750 if (err != -ERESTARTSYS && err != -EFAULT) 751 c->status = Disconnected; 752 goto reterr; 753 } 754 again: 755 /* Wait for the response */ 756 err = wait_event_interruptible(*req->wq, 757 req->status >= REQ_STATUS_RCVD); 758 759 /* 760 * Make sure our req is coherent with regard to updates in other 761 * threads - echoes to wmb() in the callback 762 */ 763 smp_rmb(); 764 765 if ((err == -ERESTARTSYS) && (c->status == Connected) 766 && (type == P9_TFLUSH)) { 767 sigpending = 1; 768 clear_thread_flag(TIF_SIGPENDING); 769 goto again; 770 } 771 772 if (req->status == REQ_STATUS_ERROR) { 773 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 774 err = req->t_err; 775 } 776 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 777 p9_debug(P9_DEBUG_MUX, "flushing\n"); 778 sigpending = 1; 779 clear_thread_flag(TIF_SIGPENDING); 780 781 if (c->trans_mod->cancel(c, req)) 782 p9_client_flush(c, req); 783 784 /* if we received the response anyway, don't signal error */ 785 if (req->status == REQ_STATUS_RCVD) 786 err = 0; 787 } 788 if (sigpending) { 789 spin_lock_irqsave(¤t->sighand->siglock, flags); 790 recalc_sigpending(); 791 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 792 } 793 if (err < 0) 794 goto reterr; 795 796 err = p9_check_errors(c, req); 797 trace_9p_client_res(c, type, req->rc->tag, err); 798 if (!err) 799 return req; 800 reterr: 801 p9_free_req(c, req); 802 return ERR_PTR(safe_errno(err)); 803 } 804 805 /** 806 * p9_client_zc_rpc - issue a request and wait for a response 807 * @c: client session 808 * @type: type of request 809 * @uidata: user bffer that should be ued for zero copy read 810 * @uodata: user buffer that shoud be user for zero copy write 811 * @inlen: read buffer size 812 * @olen: write buffer size 813 * @hdrlen: reader header size, This is the size of response protocol data 814 * @fmt: protocol format string (see protocol.c) 815 * 816 * Returns request structure (which client must free using p9_free_req) 817 */ 818 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 819 char *uidata, char *uodata, 820 int inlen, int olen, int in_hdrlen, 821 int kern_buf, const char *fmt, ...) 822 { 823 va_list ap; 824 int sigpending, err; 825 unsigned long flags; 826 struct p9_req_t *req; 827 828 va_start(ap, fmt); 829 /* 830 * We allocate a inline protocol data of only 4k bytes. 831 * The actual content is passed in zero-copy fashion. 832 */ 833 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 834 va_end(ap); 835 if (IS_ERR(req)) 836 return req; 837 838 if (signal_pending(current)) { 839 sigpending = 1; 840 clear_thread_flag(TIF_SIGPENDING); 841 } else 842 sigpending = 0; 843 844 /* If we are called with KERNEL_DS force kern_buf */ 845 if (segment_eq(get_fs(), KERNEL_DS)) 846 kern_buf = 1; 847 848 err = c->trans_mod->zc_request(c, req, uidata, uodata, 849 inlen, olen, in_hdrlen, kern_buf); 850 if (err < 0) { 851 if (err == -EIO) 852 c->status = Disconnected; 853 goto reterr; 854 } 855 if (req->status == REQ_STATUS_ERROR) { 856 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 857 err = req->t_err; 858 } 859 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 860 p9_debug(P9_DEBUG_MUX, "flushing\n"); 861 sigpending = 1; 862 clear_thread_flag(TIF_SIGPENDING); 863 864 if (c->trans_mod->cancel(c, req)) 865 p9_client_flush(c, req); 866 867 /* if we received the response anyway, don't signal error */ 868 if (req->status == REQ_STATUS_RCVD) 869 err = 0; 870 } 871 if (sigpending) { 872 spin_lock_irqsave(¤t->sighand->siglock, flags); 873 recalc_sigpending(); 874 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 875 } 876 if (err < 0) 877 goto reterr; 878 879 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf); 880 trace_9p_client_res(c, type, req->rc->tag, err); 881 if (!err) 882 return req; 883 reterr: 884 p9_free_req(c, req); 885 return ERR_PTR(safe_errno(err)); 886 } 887 888 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 889 { 890 int ret; 891 struct p9_fid *fid; 892 unsigned long flags; 893 894 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 895 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 896 if (!fid) 897 return ERR_PTR(-ENOMEM); 898 899 ret = p9_idpool_get(clnt->fidpool); 900 if (ret < 0) { 901 ret = -ENOSPC; 902 goto error; 903 } 904 fid->fid = ret; 905 906 memset(&fid->qid, 0, sizeof(struct p9_qid)); 907 fid->mode = -1; 908 fid->uid = current_fsuid(); 909 fid->clnt = clnt; 910 fid->rdir = NULL; 911 spin_lock_irqsave(&clnt->lock, flags); 912 list_add(&fid->flist, &clnt->fidlist); 913 spin_unlock_irqrestore(&clnt->lock, flags); 914 915 return fid; 916 917 error: 918 kfree(fid); 919 return ERR_PTR(ret); 920 } 921 922 static void p9_fid_destroy(struct p9_fid *fid) 923 { 924 struct p9_client *clnt; 925 unsigned long flags; 926 927 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 928 clnt = fid->clnt; 929 p9_idpool_put(fid->fid, clnt->fidpool); 930 spin_lock_irqsave(&clnt->lock, flags); 931 list_del(&fid->flist); 932 spin_unlock_irqrestore(&clnt->lock, flags); 933 kfree(fid->rdir); 934 kfree(fid); 935 } 936 937 static int p9_client_version(struct p9_client *c) 938 { 939 int err = 0; 940 struct p9_req_t *req; 941 char *version; 942 int msize; 943 944 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 945 c->msize, c->proto_version); 946 947 switch (c->proto_version) { 948 case p9_proto_2000L: 949 req = p9_client_rpc(c, P9_TVERSION, "ds", 950 c->msize, "9P2000.L"); 951 break; 952 case p9_proto_2000u: 953 req = p9_client_rpc(c, P9_TVERSION, "ds", 954 c->msize, "9P2000.u"); 955 break; 956 case p9_proto_legacy: 957 req = p9_client_rpc(c, P9_TVERSION, "ds", 958 c->msize, "9P2000"); 959 break; 960 default: 961 return -EINVAL; 962 break; 963 } 964 965 if (IS_ERR(req)) 966 return PTR_ERR(req); 967 968 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 969 if (err) { 970 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 971 trace_9p_protocol_dump(c, req->rc); 972 goto error; 973 } 974 975 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 976 if (!strncmp(version, "9P2000.L", 8)) 977 c->proto_version = p9_proto_2000L; 978 else if (!strncmp(version, "9P2000.u", 8)) 979 c->proto_version = p9_proto_2000u; 980 else if (!strncmp(version, "9P2000", 6)) 981 c->proto_version = p9_proto_legacy; 982 else { 983 err = -EREMOTEIO; 984 goto error; 985 } 986 987 if (msize < c->msize) 988 c->msize = msize; 989 990 error: 991 kfree(version); 992 p9_free_req(c, req); 993 994 return err; 995 } 996 997 struct p9_client *p9_client_create(const char *dev_name, char *options) 998 { 999 int err; 1000 struct p9_client *clnt; 1001 char *client_id; 1002 1003 err = 0; 1004 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 1005 if (!clnt) 1006 return ERR_PTR(-ENOMEM); 1007 1008 clnt->trans_mod = NULL; 1009 clnt->trans = NULL; 1010 1011 client_id = utsname()->nodename; 1012 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1013 1014 spin_lock_init(&clnt->lock); 1015 INIT_LIST_HEAD(&clnt->fidlist); 1016 1017 err = p9_tag_init(clnt); 1018 if (err < 0) 1019 goto free_client; 1020 1021 err = parse_opts(options, clnt); 1022 if (err < 0) 1023 goto destroy_tagpool; 1024 1025 if (!clnt->trans_mod) 1026 clnt->trans_mod = v9fs_get_default_trans(); 1027 1028 if (clnt->trans_mod == NULL) { 1029 err = -EPROTONOSUPPORT; 1030 p9_debug(P9_DEBUG_ERROR, 1031 "No transport defined or default transport\n"); 1032 goto destroy_tagpool; 1033 } 1034 1035 clnt->fidpool = p9_idpool_create(); 1036 if (IS_ERR(clnt->fidpool)) { 1037 err = PTR_ERR(clnt->fidpool); 1038 goto put_trans; 1039 } 1040 1041 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1042 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1043 1044 err = clnt->trans_mod->create(clnt, dev_name, options); 1045 if (err) 1046 goto destroy_fidpool; 1047 1048 if (clnt->msize > clnt->trans_mod->maxsize) 1049 clnt->msize = clnt->trans_mod->maxsize; 1050 1051 err = p9_client_version(clnt); 1052 if (err) 1053 goto close_trans; 1054 1055 return clnt; 1056 1057 close_trans: 1058 clnt->trans_mod->close(clnt); 1059 destroy_fidpool: 1060 p9_idpool_destroy(clnt->fidpool); 1061 put_trans: 1062 v9fs_put_trans(clnt->trans_mod); 1063 destroy_tagpool: 1064 p9_idpool_destroy(clnt->tagpool); 1065 free_client: 1066 kfree(clnt); 1067 return ERR_PTR(err); 1068 } 1069 EXPORT_SYMBOL(p9_client_create); 1070 1071 void p9_client_destroy(struct p9_client *clnt) 1072 { 1073 struct p9_fid *fid, *fidptr; 1074 1075 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1076 1077 if (clnt->trans_mod) 1078 clnt->trans_mod->close(clnt); 1079 1080 v9fs_put_trans(clnt->trans_mod); 1081 1082 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { 1083 pr_info("Found fid %d not clunked\n", fid->fid); 1084 p9_fid_destroy(fid); 1085 } 1086 1087 if (clnt->fidpool) 1088 p9_idpool_destroy(clnt->fidpool); 1089 1090 p9_tag_cleanup(clnt); 1091 1092 kfree(clnt); 1093 } 1094 EXPORT_SYMBOL(p9_client_destroy); 1095 1096 void p9_client_disconnect(struct p9_client *clnt) 1097 { 1098 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1099 clnt->status = Disconnected; 1100 } 1101 EXPORT_SYMBOL(p9_client_disconnect); 1102 1103 void p9_client_begin_disconnect(struct p9_client *clnt) 1104 { 1105 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1106 clnt->status = BeginDisconnect; 1107 } 1108 EXPORT_SYMBOL(p9_client_begin_disconnect); 1109 1110 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1111 char *uname, kuid_t n_uname, char *aname) 1112 { 1113 int err = 0; 1114 struct p9_req_t *req; 1115 struct p9_fid *fid; 1116 struct p9_qid qid; 1117 1118 1119 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1120 afid ? afid->fid : -1, uname, aname); 1121 fid = p9_fid_create(clnt); 1122 if (IS_ERR(fid)) { 1123 err = PTR_ERR(fid); 1124 fid = NULL; 1125 goto error; 1126 } 1127 1128 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1129 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1130 if (IS_ERR(req)) { 1131 err = PTR_ERR(req); 1132 goto error; 1133 } 1134 1135 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 1136 if (err) { 1137 trace_9p_protocol_dump(clnt, req->rc); 1138 p9_free_req(clnt, req); 1139 goto error; 1140 } 1141 1142 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1143 qid.type, (unsigned long long)qid.path, qid.version); 1144 1145 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1146 1147 p9_free_req(clnt, req); 1148 return fid; 1149 1150 error: 1151 if (fid) 1152 p9_fid_destroy(fid); 1153 return ERR_PTR(err); 1154 } 1155 EXPORT_SYMBOL(p9_client_attach); 1156 1157 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1158 char **wnames, int clone) 1159 { 1160 int err; 1161 struct p9_client *clnt; 1162 struct p9_fid *fid; 1163 struct p9_qid *wqids; 1164 struct p9_req_t *req; 1165 uint16_t nwqids, count; 1166 1167 err = 0; 1168 wqids = NULL; 1169 clnt = oldfid->clnt; 1170 if (clone) { 1171 fid = p9_fid_create(clnt); 1172 if (IS_ERR(fid)) { 1173 err = PTR_ERR(fid); 1174 fid = NULL; 1175 goto error; 1176 } 1177 1178 fid->uid = oldfid->uid; 1179 } else 1180 fid = oldfid; 1181 1182 1183 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1184 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1185 1186 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1187 nwname, wnames); 1188 if (IS_ERR(req)) { 1189 err = PTR_ERR(req); 1190 goto error; 1191 } 1192 1193 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1194 if (err) { 1195 trace_9p_protocol_dump(clnt, req->rc); 1196 p9_free_req(clnt, req); 1197 goto clunk_fid; 1198 } 1199 p9_free_req(clnt, req); 1200 1201 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1202 1203 if (nwqids != nwname) { 1204 err = -ENOENT; 1205 goto clunk_fid; 1206 } 1207 1208 for (count = 0; count < nwqids; count++) 1209 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1210 count, wqids[count].type, 1211 (unsigned long long)wqids[count].path, 1212 wqids[count].version); 1213 1214 if (nwname) 1215 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1216 else 1217 fid->qid = oldfid->qid; 1218 1219 kfree(wqids); 1220 return fid; 1221 1222 clunk_fid: 1223 kfree(wqids); 1224 p9_client_clunk(fid); 1225 fid = NULL; 1226 1227 error: 1228 if (fid && (fid != oldfid)) 1229 p9_fid_destroy(fid); 1230 1231 return ERR_PTR(err); 1232 } 1233 EXPORT_SYMBOL(p9_client_walk); 1234 1235 int p9_client_open(struct p9_fid *fid, int mode) 1236 { 1237 int err; 1238 struct p9_client *clnt; 1239 struct p9_req_t *req; 1240 struct p9_qid qid; 1241 int iounit; 1242 1243 clnt = fid->clnt; 1244 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1245 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1246 err = 0; 1247 1248 if (fid->mode != -1) 1249 return -EINVAL; 1250 1251 if (p9_is_proto_dotl(clnt)) 1252 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1253 else 1254 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1255 if (IS_ERR(req)) { 1256 err = PTR_ERR(req); 1257 goto error; 1258 } 1259 1260 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1261 if (err) { 1262 trace_9p_protocol_dump(clnt, req->rc); 1263 goto free_and_error; 1264 } 1265 1266 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1267 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1268 (unsigned long long)qid.path, qid.version, iounit); 1269 1270 fid->mode = mode; 1271 fid->iounit = iounit; 1272 1273 free_and_error: 1274 p9_free_req(clnt, req); 1275 error: 1276 return err; 1277 } 1278 EXPORT_SYMBOL(p9_client_open); 1279 1280 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode, 1281 kgid_t gid, struct p9_qid *qid) 1282 { 1283 int err = 0; 1284 struct p9_client *clnt; 1285 struct p9_req_t *req; 1286 int iounit; 1287 1288 p9_debug(P9_DEBUG_9P, 1289 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1290 ofid->fid, name, flags, mode, 1291 from_kgid(&init_user_ns, gid)); 1292 clnt = ofid->clnt; 1293 1294 if (ofid->mode != -1) 1295 return -EINVAL; 1296 1297 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1298 mode, gid); 1299 if (IS_ERR(req)) { 1300 err = PTR_ERR(req); 1301 goto error; 1302 } 1303 1304 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1305 if (err) { 1306 trace_9p_protocol_dump(clnt, req->rc); 1307 goto free_and_error; 1308 } 1309 1310 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1311 qid->type, 1312 (unsigned long long)qid->path, 1313 qid->version, iounit); 1314 1315 ofid->mode = mode; 1316 ofid->iounit = iounit; 1317 1318 free_and_error: 1319 p9_free_req(clnt, req); 1320 error: 1321 return err; 1322 } 1323 EXPORT_SYMBOL(p9_client_create_dotl); 1324 1325 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, 1326 char *extension) 1327 { 1328 int err; 1329 struct p9_client *clnt; 1330 struct p9_req_t *req; 1331 struct p9_qid qid; 1332 int iounit; 1333 1334 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1335 fid->fid, name, perm, mode); 1336 err = 0; 1337 clnt = fid->clnt; 1338 1339 if (fid->mode != -1) 1340 return -EINVAL; 1341 1342 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1343 mode, extension); 1344 if (IS_ERR(req)) { 1345 err = PTR_ERR(req); 1346 goto error; 1347 } 1348 1349 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1350 if (err) { 1351 trace_9p_protocol_dump(clnt, req->rc); 1352 goto free_and_error; 1353 } 1354 1355 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1356 qid.type, 1357 (unsigned long long)qid.path, 1358 qid.version, iounit); 1359 1360 fid->mode = mode; 1361 fid->iounit = iounit; 1362 1363 free_and_error: 1364 p9_free_req(clnt, req); 1365 error: 1366 return err; 1367 } 1368 EXPORT_SYMBOL(p9_client_fcreate); 1369 1370 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid, 1371 struct p9_qid *qid) 1372 { 1373 int err = 0; 1374 struct p9_client *clnt; 1375 struct p9_req_t *req; 1376 1377 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1378 dfid->fid, name, symtgt); 1379 clnt = dfid->clnt; 1380 1381 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1382 gid); 1383 if (IS_ERR(req)) { 1384 err = PTR_ERR(req); 1385 goto error; 1386 } 1387 1388 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1389 if (err) { 1390 trace_9p_protocol_dump(clnt, req->rc); 1391 goto free_and_error; 1392 } 1393 1394 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1395 qid->type, (unsigned long long)qid->path, qid->version); 1396 1397 free_and_error: 1398 p9_free_req(clnt, req); 1399 error: 1400 return err; 1401 } 1402 EXPORT_SYMBOL(p9_client_symlink); 1403 1404 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname) 1405 { 1406 struct p9_client *clnt; 1407 struct p9_req_t *req; 1408 1409 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1410 dfid->fid, oldfid->fid, newname); 1411 clnt = dfid->clnt; 1412 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1413 newname); 1414 if (IS_ERR(req)) 1415 return PTR_ERR(req); 1416 1417 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1418 p9_free_req(clnt, req); 1419 return 0; 1420 } 1421 EXPORT_SYMBOL(p9_client_link); 1422 1423 int p9_client_fsync(struct p9_fid *fid, int datasync) 1424 { 1425 int err; 1426 struct p9_client *clnt; 1427 struct p9_req_t *req; 1428 1429 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1430 fid->fid, datasync); 1431 err = 0; 1432 clnt = fid->clnt; 1433 1434 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1435 if (IS_ERR(req)) { 1436 err = PTR_ERR(req); 1437 goto error; 1438 } 1439 1440 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1441 1442 p9_free_req(clnt, req); 1443 1444 error: 1445 return err; 1446 } 1447 EXPORT_SYMBOL(p9_client_fsync); 1448 1449 int p9_client_clunk(struct p9_fid *fid) 1450 { 1451 int err; 1452 struct p9_client *clnt; 1453 struct p9_req_t *req; 1454 int retries = 0; 1455 1456 if (!fid) { 1457 pr_warn("%s (%d): Trying to clunk with NULL fid\n", 1458 __func__, task_pid_nr(current)); 1459 dump_stack(); 1460 return 0; 1461 } 1462 1463 again: 1464 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1465 retries); 1466 err = 0; 1467 clnt = fid->clnt; 1468 1469 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1470 if (IS_ERR(req)) { 1471 err = PTR_ERR(req); 1472 goto error; 1473 } 1474 1475 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1476 1477 p9_free_req(clnt, req); 1478 error: 1479 /* 1480 * Fid is not valid even after a failed clunk 1481 * If interrupted, retry once then give up and 1482 * leak fid until umount. 1483 */ 1484 if (err == -ERESTARTSYS) { 1485 if (retries++ == 0) 1486 goto again; 1487 } else 1488 p9_fid_destroy(fid); 1489 return err; 1490 } 1491 EXPORT_SYMBOL(p9_client_clunk); 1492 1493 int p9_client_remove(struct p9_fid *fid) 1494 { 1495 int err; 1496 struct p9_client *clnt; 1497 struct p9_req_t *req; 1498 1499 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1500 err = 0; 1501 clnt = fid->clnt; 1502 1503 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1504 if (IS_ERR(req)) { 1505 err = PTR_ERR(req); 1506 goto error; 1507 } 1508 1509 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1510 1511 p9_free_req(clnt, req); 1512 error: 1513 if (err == -ERESTARTSYS) 1514 p9_client_clunk(fid); 1515 else 1516 p9_fid_destroy(fid); 1517 return err; 1518 } 1519 EXPORT_SYMBOL(p9_client_remove); 1520 1521 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1522 { 1523 int err = 0; 1524 struct p9_req_t *req; 1525 struct p9_client *clnt; 1526 1527 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1528 dfid->fid, name, flags); 1529 1530 clnt = dfid->clnt; 1531 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1532 if (IS_ERR(req)) { 1533 err = PTR_ERR(req); 1534 goto error; 1535 } 1536 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1537 1538 p9_free_req(clnt, req); 1539 error: 1540 return err; 1541 } 1542 EXPORT_SYMBOL(p9_client_unlinkat); 1543 1544 int 1545 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, 1546 u32 count) 1547 { 1548 char *dataptr; 1549 int kernel_buf = 0; 1550 struct p9_req_t *req; 1551 struct p9_client *clnt; 1552 int err, rsize, non_zc = 0; 1553 1554 1555 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1556 fid->fid, (unsigned long long) offset, count); 1557 err = 0; 1558 clnt = fid->clnt; 1559 1560 rsize = fid->iounit; 1561 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1562 rsize = clnt->msize - P9_IOHDRSZ; 1563 1564 if (count < rsize) 1565 rsize = count; 1566 1567 /* Don't bother zerocopy for small IO (< 1024) */ 1568 if (clnt->trans_mod->zc_request && rsize > 1024) { 1569 char *indata; 1570 if (data) { 1571 kernel_buf = 1; 1572 indata = data; 1573 } else 1574 indata = (__force char *)udata; 1575 /* 1576 * response header len is 11 1577 * PDU Header(7) + IO Size (4) 1578 */ 1579 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0, 1580 11, kernel_buf, "dqd", fid->fid, 1581 offset, rsize); 1582 } else { 1583 non_zc = 1; 1584 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1585 rsize); 1586 } 1587 if (IS_ERR(req)) { 1588 err = PTR_ERR(req); 1589 goto error; 1590 } 1591 1592 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 1593 if (err) { 1594 trace_9p_protocol_dump(clnt, req->rc); 1595 goto free_and_error; 1596 } 1597 1598 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1599 1600 if (non_zc) { 1601 if (data) { 1602 memmove(data, dataptr, count); 1603 } else { 1604 err = copy_to_user(udata, dataptr, count); 1605 if (err) { 1606 err = -EFAULT; 1607 goto free_and_error; 1608 } 1609 } 1610 } 1611 p9_free_req(clnt, req); 1612 return count; 1613 1614 free_and_error: 1615 p9_free_req(clnt, req); 1616 error: 1617 return err; 1618 } 1619 EXPORT_SYMBOL(p9_client_read); 1620 1621 int 1622 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, 1623 u64 offset, u32 count) 1624 { 1625 int err, rsize; 1626 int kernel_buf = 0; 1627 struct p9_client *clnt; 1628 struct p9_req_t *req; 1629 1630 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", 1631 fid->fid, (unsigned long long) offset, count); 1632 err = 0; 1633 clnt = fid->clnt; 1634 1635 rsize = fid->iounit; 1636 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1637 rsize = clnt->msize - P9_IOHDRSZ; 1638 1639 if (count < rsize) 1640 rsize = count; 1641 1642 /* Don't bother zerocopy for small IO (< 1024) */ 1643 if (clnt->trans_mod->zc_request && rsize > 1024) { 1644 char *odata; 1645 if (data) { 1646 kernel_buf = 1; 1647 odata = data; 1648 } else 1649 odata = (char *)udata; 1650 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize, 1651 P9_ZC_HDR_SZ, kernel_buf, "dqd", 1652 fid->fid, offset, rsize); 1653 } else { 1654 if (data) 1655 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, 1656 offset, rsize, data); 1657 else 1658 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, 1659 offset, rsize, udata); 1660 } 1661 if (IS_ERR(req)) { 1662 err = PTR_ERR(req); 1663 goto error; 1664 } 1665 1666 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1667 if (err) { 1668 trace_9p_protocol_dump(clnt, req->rc); 1669 goto free_and_error; 1670 } 1671 1672 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1673 1674 p9_free_req(clnt, req); 1675 return count; 1676 1677 free_and_error: 1678 p9_free_req(clnt, req); 1679 error: 1680 return err; 1681 } 1682 EXPORT_SYMBOL(p9_client_write); 1683 1684 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1685 { 1686 int err; 1687 struct p9_client *clnt; 1688 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1689 struct p9_req_t *req; 1690 u16 ignored; 1691 1692 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1693 1694 if (!ret) 1695 return ERR_PTR(-ENOMEM); 1696 1697 err = 0; 1698 clnt = fid->clnt; 1699 1700 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1701 if (IS_ERR(req)) { 1702 err = PTR_ERR(req); 1703 goto error; 1704 } 1705 1706 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1707 if (err) { 1708 trace_9p_protocol_dump(clnt, req->rc); 1709 p9_free_req(clnt, req); 1710 goto error; 1711 } 1712 1713 p9_debug(P9_DEBUG_9P, 1714 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1715 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1716 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1717 "<<< uid=%d gid=%d n_muid=%d\n", 1718 ret->size, ret->type, ret->dev, ret->qid.type, 1719 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1720 ret->atime, ret->mtime, (unsigned long long)ret->length, 1721 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1722 from_kuid(&init_user_ns, ret->n_uid), 1723 from_kgid(&init_user_ns, ret->n_gid), 1724 from_kuid(&init_user_ns, ret->n_muid)); 1725 1726 p9_free_req(clnt, req); 1727 return ret; 1728 1729 error: 1730 kfree(ret); 1731 return ERR_PTR(err); 1732 } 1733 EXPORT_SYMBOL(p9_client_stat); 1734 1735 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1736 u64 request_mask) 1737 { 1738 int err; 1739 struct p9_client *clnt; 1740 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1741 GFP_KERNEL); 1742 struct p9_req_t *req; 1743 1744 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1745 fid->fid, request_mask); 1746 1747 if (!ret) 1748 return ERR_PTR(-ENOMEM); 1749 1750 err = 0; 1751 clnt = fid->clnt; 1752 1753 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1754 if (IS_ERR(req)) { 1755 err = PTR_ERR(req); 1756 goto error; 1757 } 1758 1759 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1760 if (err) { 1761 trace_9p_protocol_dump(clnt, req->rc); 1762 p9_free_req(clnt, req); 1763 goto error; 1764 } 1765 1766 p9_debug(P9_DEBUG_9P, 1767 "<<< RGETATTR st_result_mask=%lld\n" 1768 "<<< qid=%x.%llx.%x\n" 1769 "<<< st_mode=%8.8x st_nlink=%llu\n" 1770 "<<< st_uid=%d st_gid=%d\n" 1771 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1772 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1773 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1774 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1775 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1776 "<<< st_gen=%lld st_data_version=%lld", 1777 ret->st_result_mask, ret->qid.type, ret->qid.path, 1778 ret->qid.version, ret->st_mode, ret->st_nlink, 1779 from_kuid(&init_user_ns, ret->st_uid), 1780 from_kgid(&init_user_ns, ret->st_gid), 1781 ret->st_rdev, ret->st_size, ret->st_blksize, 1782 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1783 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1784 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1785 ret->st_gen, ret->st_data_version); 1786 1787 p9_free_req(clnt, req); 1788 return ret; 1789 1790 error: 1791 kfree(ret); 1792 return ERR_PTR(err); 1793 } 1794 EXPORT_SYMBOL(p9_client_getattr_dotl); 1795 1796 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1797 { 1798 int ret; 1799 1800 /* NOTE: size shouldn't include its own length */ 1801 /* size[2] type[2] dev[4] qid[13] */ 1802 /* mode[4] atime[4] mtime[4] length[8]*/ 1803 /* name[s] uid[s] gid[s] muid[s] */ 1804 ret = 2+4+13+4+4+4+8+2+2+2+2; 1805 1806 if (wst->name) 1807 ret += strlen(wst->name); 1808 if (wst->uid) 1809 ret += strlen(wst->uid); 1810 if (wst->gid) 1811 ret += strlen(wst->gid); 1812 if (wst->muid) 1813 ret += strlen(wst->muid); 1814 1815 if ((proto_version == p9_proto_2000u) || 1816 (proto_version == p9_proto_2000L)) { 1817 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1818 if (wst->extension) 1819 ret += strlen(wst->extension); 1820 } 1821 1822 return ret; 1823 } 1824 1825 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1826 { 1827 int err; 1828 struct p9_req_t *req; 1829 struct p9_client *clnt; 1830 1831 err = 0; 1832 clnt = fid->clnt; 1833 wst->size = p9_client_statsize(wst, clnt->proto_version); 1834 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1835 p9_debug(P9_DEBUG_9P, 1836 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1837 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1838 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1839 " uid=%d gid=%d n_muid=%d\n", 1840 wst->size, wst->type, wst->dev, wst->qid.type, 1841 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1842 wst->atime, wst->mtime, (unsigned long long)wst->length, 1843 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1844 from_kuid(&init_user_ns, wst->n_uid), 1845 from_kgid(&init_user_ns, wst->n_gid), 1846 from_kuid(&init_user_ns, wst->n_muid)); 1847 1848 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1849 if (IS_ERR(req)) { 1850 err = PTR_ERR(req); 1851 goto error; 1852 } 1853 1854 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1855 1856 p9_free_req(clnt, req); 1857 error: 1858 return err; 1859 } 1860 EXPORT_SYMBOL(p9_client_wstat); 1861 1862 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1863 { 1864 int err; 1865 struct p9_req_t *req; 1866 struct p9_client *clnt; 1867 1868 err = 0; 1869 clnt = fid->clnt; 1870 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1871 p9_debug(P9_DEBUG_9P, 1872 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1873 " atime_sec=%lld atime_nsec=%lld\n" 1874 " mtime_sec=%lld mtime_nsec=%lld\n", 1875 p9attr->valid, p9attr->mode, 1876 from_kuid(&init_user_ns, p9attr->uid), 1877 from_kgid(&init_user_ns, p9attr->gid), 1878 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1879 p9attr->mtime_sec, p9attr->mtime_nsec); 1880 1881 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1882 1883 if (IS_ERR(req)) { 1884 err = PTR_ERR(req); 1885 goto error; 1886 } 1887 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1888 p9_free_req(clnt, req); 1889 error: 1890 return err; 1891 } 1892 EXPORT_SYMBOL(p9_client_setattr); 1893 1894 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1895 { 1896 int err; 1897 struct p9_req_t *req; 1898 struct p9_client *clnt; 1899 1900 err = 0; 1901 clnt = fid->clnt; 1902 1903 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1904 1905 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1906 if (IS_ERR(req)) { 1907 err = PTR_ERR(req); 1908 goto error; 1909 } 1910 1911 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1912 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1913 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1914 if (err) { 1915 trace_9p_protocol_dump(clnt, req->rc); 1916 p9_free_req(clnt, req); 1917 goto error; 1918 } 1919 1920 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1921 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1922 "fsid %llu namelen %ld\n", 1923 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1924 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1925 sb->fsid, (long int)sb->namelen); 1926 1927 p9_free_req(clnt, req); 1928 error: 1929 return err; 1930 } 1931 EXPORT_SYMBOL(p9_client_statfs); 1932 1933 int p9_client_rename(struct p9_fid *fid, 1934 struct p9_fid *newdirfid, const char *name) 1935 { 1936 int err; 1937 struct p9_req_t *req; 1938 struct p9_client *clnt; 1939 1940 err = 0; 1941 clnt = fid->clnt; 1942 1943 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1944 fid->fid, newdirfid->fid, name); 1945 1946 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1947 newdirfid->fid, name); 1948 if (IS_ERR(req)) { 1949 err = PTR_ERR(req); 1950 goto error; 1951 } 1952 1953 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1954 1955 p9_free_req(clnt, req); 1956 error: 1957 return err; 1958 } 1959 EXPORT_SYMBOL(p9_client_rename); 1960 1961 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1962 struct p9_fid *newdirfid, const char *new_name) 1963 { 1964 int err; 1965 struct p9_req_t *req; 1966 struct p9_client *clnt; 1967 1968 err = 0; 1969 clnt = olddirfid->clnt; 1970 1971 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1972 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1973 newdirfid->fid, new_name); 1974 1975 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1976 old_name, newdirfid->fid, new_name); 1977 if (IS_ERR(req)) { 1978 err = PTR_ERR(req); 1979 goto error; 1980 } 1981 1982 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1983 newdirfid->fid, new_name); 1984 1985 p9_free_req(clnt, req); 1986 error: 1987 return err; 1988 } 1989 EXPORT_SYMBOL(p9_client_renameat); 1990 1991 /* 1992 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1993 */ 1994 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1995 const char *attr_name, u64 *attr_size) 1996 { 1997 int err; 1998 struct p9_req_t *req; 1999 struct p9_client *clnt; 2000 struct p9_fid *attr_fid; 2001 2002 err = 0; 2003 clnt = file_fid->clnt; 2004 attr_fid = p9_fid_create(clnt); 2005 if (IS_ERR(attr_fid)) { 2006 err = PTR_ERR(attr_fid); 2007 attr_fid = NULL; 2008 goto error; 2009 } 2010 p9_debug(P9_DEBUG_9P, 2011 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2012 file_fid->fid, attr_fid->fid, attr_name); 2013 2014 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2015 file_fid->fid, attr_fid->fid, attr_name); 2016 if (IS_ERR(req)) { 2017 err = PTR_ERR(req); 2018 goto error; 2019 } 2020 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 2021 if (err) { 2022 trace_9p_protocol_dump(clnt, req->rc); 2023 p9_free_req(clnt, req); 2024 goto clunk_fid; 2025 } 2026 p9_free_req(clnt, req); 2027 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2028 attr_fid->fid, *attr_size); 2029 return attr_fid; 2030 clunk_fid: 2031 p9_client_clunk(attr_fid); 2032 attr_fid = NULL; 2033 error: 2034 if (attr_fid && (attr_fid != file_fid)) 2035 p9_fid_destroy(attr_fid); 2036 2037 return ERR_PTR(err); 2038 } 2039 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2040 2041 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2042 u64 attr_size, int flags) 2043 { 2044 int err; 2045 struct p9_req_t *req; 2046 struct p9_client *clnt; 2047 2048 p9_debug(P9_DEBUG_9P, 2049 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2050 fid->fid, name, (long long)attr_size, flags); 2051 err = 0; 2052 clnt = fid->clnt; 2053 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2054 fid->fid, name, attr_size, flags); 2055 if (IS_ERR(req)) { 2056 err = PTR_ERR(req); 2057 goto error; 2058 } 2059 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2060 p9_free_req(clnt, req); 2061 error: 2062 return err; 2063 } 2064 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2065 2066 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2067 { 2068 int err, rsize, non_zc = 0; 2069 struct p9_client *clnt; 2070 struct p9_req_t *req; 2071 char *dataptr; 2072 2073 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2074 fid->fid, (unsigned long long) offset, count); 2075 2076 err = 0; 2077 clnt = fid->clnt; 2078 2079 rsize = fid->iounit; 2080 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2081 rsize = clnt->msize - P9_READDIRHDRSZ; 2082 2083 if (count < rsize) 2084 rsize = count; 2085 2086 /* Don't bother zerocopy for small IO (< 1024) */ 2087 if (clnt->trans_mod->zc_request && rsize > 1024) { 2088 /* 2089 * response header len is 11 2090 * PDU Header(7) + IO Size (4) 2091 */ 2092 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0, 2093 11, 1, "dqd", fid->fid, offset, rsize); 2094 } else { 2095 non_zc = 1; 2096 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2097 offset, rsize); 2098 } 2099 if (IS_ERR(req)) { 2100 err = PTR_ERR(req); 2101 goto error; 2102 } 2103 2104 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 2105 if (err) { 2106 trace_9p_protocol_dump(clnt, req->rc); 2107 goto free_and_error; 2108 } 2109 2110 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2111 2112 if (non_zc) 2113 memmove(data, dataptr, count); 2114 2115 p9_free_req(clnt, req); 2116 return count; 2117 2118 free_and_error: 2119 p9_free_req(clnt, req); 2120 error: 2121 return err; 2122 } 2123 EXPORT_SYMBOL(p9_client_readdir); 2124 2125 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode, 2126 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2127 { 2128 int err; 2129 struct p9_client *clnt; 2130 struct p9_req_t *req; 2131 2132 err = 0; 2133 clnt = fid->clnt; 2134 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2135 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2136 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2137 MAJOR(rdev), MINOR(rdev), gid); 2138 if (IS_ERR(req)) 2139 return PTR_ERR(req); 2140 2141 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2142 if (err) { 2143 trace_9p_protocol_dump(clnt, req->rc); 2144 goto error; 2145 } 2146 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2147 (unsigned long long)qid->path, qid->version); 2148 2149 error: 2150 p9_free_req(clnt, req); 2151 return err; 2152 2153 } 2154 EXPORT_SYMBOL(p9_client_mknod_dotl); 2155 2156 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode, 2157 kgid_t gid, struct p9_qid *qid) 2158 { 2159 int err; 2160 struct p9_client *clnt; 2161 struct p9_req_t *req; 2162 2163 err = 0; 2164 clnt = fid->clnt; 2165 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2166 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2167 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2168 gid); 2169 if (IS_ERR(req)) 2170 return PTR_ERR(req); 2171 2172 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2173 if (err) { 2174 trace_9p_protocol_dump(clnt, req->rc); 2175 goto error; 2176 } 2177 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2178 (unsigned long long)qid->path, qid->version); 2179 2180 error: 2181 p9_free_req(clnt, req); 2182 return err; 2183 2184 } 2185 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2186 2187 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2188 { 2189 int err; 2190 struct p9_client *clnt; 2191 struct p9_req_t *req; 2192 2193 err = 0; 2194 clnt = fid->clnt; 2195 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2196 "start %lld length %lld proc_id %d client_id %s\n", 2197 fid->fid, flock->type, flock->flags, flock->start, 2198 flock->length, flock->proc_id, flock->client_id); 2199 2200 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2201 flock->flags, flock->start, flock->length, 2202 flock->proc_id, flock->client_id); 2203 2204 if (IS_ERR(req)) 2205 return PTR_ERR(req); 2206 2207 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); 2208 if (err) { 2209 trace_9p_protocol_dump(clnt, req->rc); 2210 goto error; 2211 } 2212 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2213 error: 2214 p9_free_req(clnt, req); 2215 return err; 2216 2217 } 2218 EXPORT_SYMBOL(p9_client_lock_dotl); 2219 2220 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2221 { 2222 int err; 2223 struct p9_client *clnt; 2224 struct p9_req_t *req; 2225 2226 err = 0; 2227 clnt = fid->clnt; 2228 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2229 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2230 glock->start, glock->length, glock->proc_id, glock->client_id); 2231 2232 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2233 glock->start, glock->length, glock->proc_id, glock->client_id); 2234 2235 if (IS_ERR(req)) 2236 return PTR_ERR(req); 2237 2238 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, 2239 &glock->start, &glock->length, &glock->proc_id, 2240 &glock->client_id); 2241 if (err) { 2242 trace_9p_protocol_dump(clnt, req->rc); 2243 goto error; 2244 } 2245 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2246 "proc_id %d client_id %s\n", glock->type, glock->start, 2247 glock->length, glock->proc_id, glock->client_id); 2248 error: 2249 p9_free_req(clnt, req); 2250 return err; 2251 } 2252 EXPORT_SYMBOL(p9_client_getlock_dotl); 2253 2254 int p9_client_readlink(struct p9_fid *fid, char **target) 2255 { 2256 int err; 2257 struct p9_client *clnt; 2258 struct p9_req_t *req; 2259 2260 err = 0; 2261 clnt = fid->clnt; 2262 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2263 2264 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2265 if (IS_ERR(req)) 2266 return PTR_ERR(req); 2267 2268 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); 2269 if (err) { 2270 trace_9p_protocol_dump(clnt, req->rc); 2271 goto error; 2272 } 2273 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2274 error: 2275 p9_free_req(clnt, req); 2276 return err; 2277 } 2278 EXPORT_SYMBOL(p9_client_readlink); 2279