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