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/signal.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 if (!copy_from_iter_full(ename + inline_len, 596 len - inline_len, uidata)) { 597 err = -EFAULT; 598 goto out_err; 599 } 600 } 601 ename = NULL; 602 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 603 &ename, &ecode); 604 if (err) 605 goto out_err; 606 607 if (p9_is_proto_dotu(c) && ecode < 512) 608 err = -ecode; 609 610 if (!err) { 611 err = p9_errstr2errno(ename, strlen(ename)); 612 613 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 614 -ecode, ename); 615 } 616 kfree(ename); 617 } else { 618 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 619 err = -ecode; 620 621 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 622 } 623 return err; 624 625 out_err: 626 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 627 return err; 628 } 629 630 static struct p9_req_t * 631 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 632 633 /** 634 * p9_client_flush - flush (cancel) a request 635 * @c: client state 636 * @oldreq: request to cancel 637 * 638 * This sents a flush for a particular request and links 639 * the flush request to the original request. The current 640 * code only supports a single flush request although the protocol 641 * allows for multiple flush requests to be sent for a single request. 642 * 643 */ 644 645 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 646 { 647 struct p9_req_t *req; 648 int16_t oldtag; 649 int err; 650 651 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 652 if (err) 653 return err; 654 655 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 656 657 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 658 if (IS_ERR(req)) 659 return PTR_ERR(req); 660 661 /* 662 * if we haven't received a response for oldreq, 663 * remove it from the list 664 */ 665 if (oldreq->status == REQ_STATUS_SENT) 666 if (c->trans_mod->cancelled) 667 c->trans_mod->cancelled(c, oldreq); 668 669 p9_free_req(c, req); 670 return 0; 671 } 672 673 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 674 int8_t type, int req_size, 675 const char *fmt, va_list ap) 676 { 677 int tag, err; 678 struct p9_req_t *req; 679 680 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 681 682 /* we allow for any status other than disconnected */ 683 if (c->status == Disconnected) 684 return ERR_PTR(-EIO); 685 686 /* if status is begin_disconnected we allow only clunk request */ 687 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 688 return ERR_PTR(-EIO); 689 690 tag = P9_NOTAG; 691 if (type != P9_TVERSION) { 692 tag = p9_idpool_get(c->tagpool); 693 if (tag < 0) 694 return ERR_PTR(-ENOMEM); 695 } 696 697 req = p9_tag_alloc(c, tag, req_size); 698 if (IS_ERR(req)) 699 return req; 700 701 /* marshall the data */ 702 p9pdu_prepare(req->tc, tag, type); 703 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 704 if (err) 705 goto reterr; 706 p9pdu_finalize(c, req->tc); 707 trace_9p_client_req(c, type, tag); 708 return req; 709 reterr: 710 p9_free_req(c, req); 711 return ERR_PTR(err); 712 } 713 714 /** 715 * p9_client_rpc - issue a request and wait for a response 716 * @c: client session 717 * @type: type of request 718 * @fmt: protocol format string (see protocol.c) 719 * 720 * Returns request structure (which client must free using p9_free_req) 721 */ 722 723 static struct p9_req_t * 724 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 725 { 726 va_list ap; 727 int sigpending, err; 728 unsigned long flags; 729 struct p9_req_t *req; 730 731 va_start(ap, fmt); 732 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 733 va_end(ap); 734 if (IS_ERR(req)) 735 return req; 736 737 if (signal_pending(current)) { 738 sigpending = 1; 739 clear_thread_flag(TIF_SIGPENDING); 740 } else 741 sigpending = 0; 742 743 err = c->trans_mod->request(c, req); 744 if (err < 0) { 745 if (err != -ERESTARTSYS && err != -EFAULT) 746 c->status = Disconnected; 747 goto reterr; 748 } 749 again: 750 /* Wait for the response */ 751 err = wait_event_interruptible(*req->wq, 752 req->status >= REQ_STATUS_RCVD); 753 754 /* 755 * Make sure our req is coherent with regard to updates in other 756 * threads - echoes to wmb() in the callback 757 */ 758 smp_rmb(); 759 760 if ((err == -ERESTARTSYS) && (c->status == Connected) 761 && (type == P9_TFLUSH)) { 762 sigpending = 1; 763 clear_thread_flag(TIF_SIGPENDING); 764 goto again; 765 } 766 767 if (req->status == REQ_STATUS_ERROR) { 768 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 769 err = req->t_err; 770 } 771 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 772 p9_debug(P9_DEBUG_MUX, "flushing\n"); 773 sigpending = 1; 774 clear_thread_flag(TIF_SIGPENDING); 775 776 if (c->trans_mod->cancel(c, req)) 777 p9_client_flush(c, req); 778 779 /* if we received the response anyway, don't signal error */ 780 if (req->status == REQ_STATUS_RCVD) 781 err = 0; 782 } 783 if (sigpending) { 784 spin_lock_irqsave(¤t->sighand->siglock, flags); 785 recalc_sigpending(); 786 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 787 } 788 if (err < 0) 789 goto reterr; 790 791 err = p9_check_errors(c, req); 792 trace_9p_client_res(c, type, req->rc->tag, err); 793 if (!err) 794 return req; 795 reterr: 796 p9_free_req(c, req); 797 return ERR_PTR(safe_errno(err)); 798 } 799 800 /** 801 * p9_client_zc_rpc - issue a request and wait for a response 802 * @c: client session 803 * @type: type of request 804 * @uidata: destination for zero copy read 805 * @uodata: source for zero copy write 806 * @inlen: read buffer size 807 * @olen: write buffer size 808 * @hdrlen: reader header size, This is the size of response protocol data 809 * @fmt: protocol format string (see protocol.c) 810 * 811 * Returns request structure (which client must free using p9_free_req) 812 */ 813 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 814 struct iov_iter *uidata, 815 struct iov_iter *uodata, 816 int inlen, int olen, int in_hdrlen, 817 const char *fmt, ...) 818 { 819 va_list ap; 820 int sigpending, err; 821 unsigned long flags; 822 struct p9_req_t *req; 823 824 va_start(ap, fmt); 825 /* 826 * We allocate a inline protocol data of only 4k bytes. 827 * The actual content is passed in zero-copy fashion. 828 */ 829 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 830 va_end(ap); 831 if (IS_ERR(req)) 832 return req; 833 834 if (signal_pending(current)) { 835 sigpending = 1; 836 clear_thread_flag(TIF_SIGPENDING); 837 } else 838 sigpending = 0; 839 840 err = c->trans_mod->zc_request(c, req, uidata, uodata, 841 inlen, olen, in_hdrlen); 842 if (err < 0) { 843 if (err == -EIO) 844 c->status = Disconnected; 845 if (err != -ERESTARTSYS) 846 goto reterr; 847 } 848 if (req->status == REQ_STATUS_ERROR) { 849 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 850 err = req->t_err; 851 } 852 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 853 p9_debug(P9_DEBUG_MUX, "flushing\n"); 854 sigpending = 1; 855 clear_thread_flag(TIF_SIGPENDING); 856 857 if (c->trans_mod->cancel(c, req)) 858 p9_client_flush(c, req); 859 860 /* if we received the response anyway, don't signal error */ 861 if (req->status == REQ_STATUS_RCVD) 862 err = 0; 863 } 864 if (sigpending) { 865 spin_lock_irqsave(¤t->sighand->siglock, flags); 866 recalc_sigpending(); 867 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 868 } 869 if (err < 0) 870 goto reterr; 871 872 err = p9_check_zc_errors(c, req, uidata, in_hdrlen); 873 trace_9p_client_res(c, type, req->rc->tag, err); 874 if (!err) 875 return req; 876 reterr: 877 p9_free_req(c, req); 878 return ERR_PTR(safe_errno(err)); 879 } 880 881 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 882 { 883 int ret; 884 struct p9_fid *fid; 885 unsigned long flags; 886 887 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 888 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 889 if (!fid) 890 return ERR_PTR(-ENOMEM); 891 892 ret = p9_idpool_get(clnt->fidpool); 893 if (ret < 0) { 894 ret = -ENOSPC; 895 goto error; 896 } 897 fid->fid = ret; 898 899 memset(&fid->qid, 0, sizeof(struct p9_qid)); 900 fid->mode = -1; 901 fid->uid = current_fsuid(); 902 fid->clnt = clnt; 903 fid->rdir = NULL; 904 spin_lock_irqsave(&clnt->lock, flags); 905 list_add(&fid->flist, &clnt->fidlist); 906 spin_unlock_irqrestore(&clnt->lock, flags); 907 908 return fid; 909 910 error: 911 kfree(fid); 912 return ERR_PTR(ret); 913 } 914 915 static void p9_fid_destroy(struct p9_fid *fid) 916 { 917 struct p9_client *clnt; 918 unsigned long flags; 919 920 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 921 clnt = fid->clnt; 922 p9_idpool_put(fid->fid, clnt->fidpool); 923 spin_lock_irqsave(&clnt->lock, flags); 924 list_del(&fid->flist); 925 spin_unlock_irqrestore(&clnt->lock, flags); 926 kfree(fid->rdir); 927 kfree(fid); 928 } 929 930 static int p9_client_version(struct p9_client *c) 931 { 932 int err = 0; 933 struct p9_req_t *req; 934 char *version; 935 int msize; 936 937 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 938 c->msize, c->proto_version); 939 940 switch (c->proto_version) { 941 case p9_proto_2000L: 942 req = p9_client_rpc(c, P9_TVERSION, "ds", 943 c->msize, "9P2000.L"); 944 break; 945 case p9_proto_2000u: 946 req = p9_client_rpc(c, P9_TVERSION, "ds", 947 c->msize, "9P2000.u"); 948 break; 949 case p9_proto_legacy: 950 req = p9_client_rpc(c, P9_TVERSION, "ds", 951 c->msize, "9P2000"); 952 break; 953 default: 954 return -EINVAL; 955 } 956 957 if (IS_ERR(req)) 958 return PTR_ERR(req); 959 960 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 961 if (err) { 962 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 963 trace_9p_protocol_dump(c, req->rc); 964 goto error; 965 } 966 967 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 968 if (!strncmp(version, "9P2000.L", 8)) 969 c->proto_version = p9_proto_2000L; 970 else if (!strncmp(version, "9P2000.u", 8)) 971 c->proto_version = p9_proto_2000u; 972 else if (!strncmp(version, "9P2000", 6)) 973 c->proto_version = p9_proto_legacy; 974 else { 975 err = -EREMOTEIO; 976 goto error; 977 } 978 979 if (msize < c->msize) 980 c->msize = msize; 981 982 error: 983 kfree(version); 984 p9_free_req(c, req); 985 986 return err; 987 } 988 989 struct p9_client *p9_client_create(const char *dev_name, char *options) 990 { 991 int err; 992 struct p9_client *clnt; 993 char *client_id; 994 995 err = 0; 996 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 997 if (!clnt) 998 return ERR_PTR(-ENOMEM); 999 1000 clnt->trans_mod = NULL; 1001 clnt->trans = NULL; 1002 1003 client_id = utsname()->nodename; 1004 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1005 1006 spin_lock_init(&clnt->lock); 1007 INIT_LIST_HEAD(&clnt->fidlist); 1008 1009 err = p9_tag_init(clnt); 1010 if (err < 0) 1011 goto free_client; 1012 1013 err = parse_opts(options, clnt); 1014 if (err < 0) 1015 goto destroy_tagpool; 1016 1017 if (!clnt->trans_mod) 1018 clnt->trans_mod = v9fs_get_default_trans(); 1019 1020 if (clnt->trans_mod == NULL) { 1021 err = -EPROTONOSUPPORT; 1022 p9_debug(P9_DEBUG_ERROR, 1023 "No transport defined or default transport\n"); 1024 goto destroy_tagpool; 1025 } 1026 1027 clnt->fidpool = p9_idpool_create(); 1028 if (IS_ERR(clnt->fidpool)) { 1029 err = PTR_ERR(clnt->fidpool); 1030 goto put_trans; 1031 } 1032 1033 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1034 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1035 1036 err = clnt->trans_mod->create(clnt, dev_name, options); 1037 if (err) 1038 goto destroy_fidpool; 1039 1040 if (clnt->msize > clnt->trans_mod->maxsize) 1041 clnt->msize = clnt->trans_mod->maxsize; 1042 1043 err = p9_client_version(clnt); 1044 if (err) 1045 goto close_trans; 1046 1047 return clnt; 1048 1049 close_trans: 1050 clnt->trans_mod->close(clnt); 1051 destroy_fidpool: 1052 p9_idpool_destroy(clnt->fidpool); 1053 put_trans: 1054 v9fs_put_trans(clnt->trans_mod); 1055 destroy_tagpool: 1056 p9_idpool_destroy(clnt->tagpool); 1057 free_client: 1058 kfree(clnt); 1059 return ERR_PTR(err); 1060 } 1061 EXPORT_SYMBOL(p9_client_create); 1062 1063 void p9_client_destroy(struct p9_client *clnt) 1064 { 1065 struct p9_fid *fid, *fidptr; 1066 1067 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1068 1069 if (clnt->trans_mod) 1070 clnt->trans_mod->close(clnt); 1071 1072 v9fs_put_trans(clnt->trans_mod); 1073 1074 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { 1075 pr_info("Found fid %d not clunked\n", fid->fid); 1076 p9_fid_destroy(fid); 1077 } 1078 1079 if (clnt->fidpool) 1080 p9_idpool_destroy(clnt->fidpool); 1081 1082 p9_tag_cleanup(clnt); 1083 1084 kfree(clnt); 1085 } 1086 EXPORT_SYMBOL(p9_client_destroy); 1087 1088 void p9_client_disconnect(struct p9_client *clnt) 1089 { 1090 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1091 clnt->status = Disconnected; 1092 } 1093 EXPORT_SYMBOL(p9_client_disconnect); 1094 1095 void p9_client_begin_disconnect(struct p9_client *clnt) 1096 { 1097 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1098 clnt->status = BeginDisconnect; 1099 } 1100 EXPORT_SYMBOL(p9_client_begin_disconnect); 1101 1102 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1103 const char *uname, kuid_t n_uname, const char *aname) 1104 { 1105 int err = 0; 1106 struct p9_req_t *req; 1107 struct p9_fid *fid; 1108 struct p9_qid qid; 1109 1110 1111 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1112 afid ? afid->fid : -1, uname, aname); 1113 fid = p9_fid_create(clnt); 1114 if (IS_ERR(fid)) { 1115 err = PTR_ERR(fid); 1116 fid = NULL; 1117 goto error; 1118 } 1119 fid->uid = n_uname; 1120 1121 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1122 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1123 if (IS_ERR(req)) { 1124 err = PTR_ERR(req); 1125 goto error; 1126 } 1127 1128 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 1129 if (err) { 1130 trace_9p_protocol_dump(clnt, req->rc); 1131 p9_free_req(clnt, req); 1132 goto error; 1133 } 1134 1135 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1136 qid.type, (unsigned long long)qid.path, qid.version); 1137 1138 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1139 1140 p9_free_req(clnt, req); 1141 return fid; 1142 1143 error: 1144 if (fid) 1145 p9_fid_destroy(fid); 1146 return ERR_PTR(err); 1147 } 1148 EXPORT_SYMBOL(p9_client_attach); 1149 1150 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1151 const unsigned char * const *wnames, int clone) 1152 { 1153 int err; 1154 struct p9_client *clnt; 1155 struct p9_fid *fid; 1156 struct p9_qid *wqids; 1157 struct p9_req_t *req; 1158 uint16_t nwqids, count; 1159 1160 err = 0; 1161 wqids = NULL; 1162 clnt = oldfid->clnt; 1163 if (clone) { 1164 fid = p9_fid_create(clnt); 1165 if (IS_ERR(fid)) { 1166 err = PTR_ERR(fid); 1167 fid = NULL; 1168 goto error; 1169 } 1170 1171 fid->uid = oldfid->uid; 1172 } else 1173 fid = oldfid; 1174 1175 1176 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1177 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1178 1179 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1180 nwname, wnames); 1181 if (IS_ERR(req)) { 1182 err = PTR_ERR(req); 1183 goto error; 1184 } 1185 1186 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1187 if (err) { 1188 trace_9p_protocol_dump(clnt, req->rc); 1189 p9_free_req(clnt, req); 1190 goto clunk_fid; 1191 } 1192 p9_free_req(clnt, req); 1193 1194 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1195 1196 if (nwqids != nwname) { 1197 err = -ENOENT; 1198 goto clunk_fid; 1199 } 1200 1201 for (count = 0; count < nwqids; count++) 1202 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1203 count, wqids[count].type, 1204 (unsigned long long)wqids[count].path, 1205 wqids[count].version); 1206 1207 if (nwname) 1208 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1209 else 1210 fid->qid = oldfid->qid; 1211 1212 kfree(wqids); 1213 return fid; 1214 1215 clunk_fid: 1216 kfree(wqids); 1217 p9_client_clunk(fid); 1218 fid = NULL; 1219 1220 error: 1221 if (fid && (fid != oldfid)) 1222 p9_fid_destroy(fid); 1223 1224 return ERR_PTR(err); 1225 } 1226 EXPORT_SYMBOL(p9_client_walk); 1227 1228 int p9_client_open(struct p9_fid *fid, int mode) 1229 { 1230 int err; 1231 struct p9_client *clnt; 1232 struct p9_req_t *req; 1233 struct p9_qid qid; 1234 int iounit; 1235 1236 clnt = fid->clnt; 1237 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1238 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1239 err = 0; 1240 1241 if (fid->mode != -1) 1242 return -EINVAL; 1243 1244 if (p9_is_proto_dotl(clnt)) 1245 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1246 else 1247 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1248 if (IS_ERR(req)) { 1249 err = PTR_ERR(req); 1250 goto error; 1251 } 1252 1253 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1254 if (err) { 1255 trace_9p_protocol_dump(clnt, req->rc); 1256 goto free_and_error; 1257 } 1258 1259 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1260 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1261 (unsigned long long)qid.path, qid.version, iounit); 1262 1263 fid->mode = mode; 1264 fid->iounit = iounit; 1265 1266 free_and_error: 1267 p9_free_req(clnt, req); 1268 error: 1269 return err; 1270 } 1271 EXPORT_SYMBOL(p9_client_open); 1272 1273 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, 1274 kgid_t gid, struct p9_qid *qid) 1275 { 1276 int err = 0; 1277 struct p9_client *clnt; 1278 struct p9_req_t *req; 1279 int iounit; 1280 1281 p9_debug(P9_DEBUG_9P, 1282 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1283 ofid->fid, name, flags, mode, 1284 from_kgid(&init_user_ns, gid)); 1285 clnt = ofid->clnt; 1286 1287 if (ofid->mode != -1) 1288 return -EINVAL; 1289 1290 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1291 mode, gid); 1292 if (IS_ERR(req)) { 1293 err = PTR_ERR(req); 1294 goto error; 1295 } 1296 1297 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1298 if (err) { 1299 trace_9p_protocol_dump(clnt, req->rc); 1300 goto free_and_error; 1301 } 1302 1303 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1304 qid->type, 1305 (unsigned long long)qid->path, 1306 qid->version, iounit); 1307 1308 ofid->mode = mode; 1309 ofid->iounit = iounit; 1310 1311 free_and_error: 1312 p9_free_req(clnt, req); 1313 error: 1314 return err; 1315 } 1316 EXPORT_SYMBOL(p9_client_create_dotl); 1317 1318 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1319 char *extension) 1320 { 1321 int err; 1322 struct p9_client *clnt; 1323 struct p9_req_t *req; 1324 struct p9_qid qid; 1325 int iounit; 1326 1327 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1328 fid->fid, name, perm, mode); 1329 err = 0; 1330 clnt = fid->clnt; 1331 1332 if (fid->mode != -1) 1333 return -EINVAL; 1334 1335 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1336 mode, extension); 1337 if (IS_ERR(req)) { 1338 err = PTR_ERR(req); 1339 goto error; 1340 } 1341 1342 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1343 if (err) { 1344 trace_9p_protocol_dump(clnt, req->rc); 1345 goto free_and_error; 1346 } 1347 1348 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1349 qid.type, 1350 (unsigned long long)qid.path, 1351 qid.version, iounit); 1352 1353 fid->mode = mode; 1354 fid->iounit = iounit; 1355 1356 free_and_error: 1357 p9_free_req(clnt, req); 1358 error: 1359 return err; 1360 } 1361 EXPORT_SYMBOL(p9_client_fcreate); 1362 1363 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1364 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1365 { 1366 int err = 0; 1367 struct p9_client *clnt; 1368 struct p9_req_t *req; 1369 1370 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1371 dfid->fid, name, symtgt); 1372 clnt = dfid->clnt; 1373 1374 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1375 gid); 1376 if (IS_ERR(req)) { 1377 err = PTR_ERR(req); 1378 goto error; 1379 } 1380 1381 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1382 if (err) { 1383 trace_9p_protocol_dump(clnt, req->rc); 1384 goto free_and_error; 1385 } 1386 1387 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1388 qid->type, (unsigned long long)qid->path, qid->version); 1389 1390 free_and_error: 1391 p9_free_req(clnt, req); 1392 error: 1393 return err; 1394 } 1395 EXPORT_SYMBOL(p9_client_symlink); 1396 1397 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1398 { 1399 struct p9_client *clnt; 1400 struct p9_req_t *req; 1401 1402 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1403 dfid->fid, oldfid->fid, newname); 1404 clnt = dfid->clnt; 1405 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1406 newname); 1407 if (IS_ERR(req)) 1408 return PTR_ERR(req); 1409 1410 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1411 p9_free_req(clnt, req); 1412 return 0; 1413 } 1414 EXPORT_SYMBOL(p9_client_link); 1415 1416 int p9_client_fsync(struct p9_fid *fid, int datasync) 1417 { 1418 int err; 1419 struct p9_client *clnt; 1420 struct p9_req_t *req; 1421 1422 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1423 fid->fid, datasync); 1424 err = 0; 1425 clnt = fid->clnt; 1426 1427 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1428 if (IS_ERR(req)) { 1429 err = PTR_ERR(req); 1430 goto error; 1431 } 1432 1433 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1434 1435 p9_free_req(clnt, req); 1436 1437 error: 1438 return err; 1439 } 1440 EXPORT_SYMBOL(p9_client_fsync); 1441 1442 int p9_client_clunk(struct p9_fid *fid) 1443 { 1444 int err; 1445 struct p9_client *clnt; 1446 struct p9_req_t *req; 1447 int retries = 0; 1448 1449 if (!fid) { 1450 pr_warn("%s (%d): Trying to clunk with NULL fid\n", 1451 __func__, task_pid_nr(current)); 1452 dump_stack(); 1453 return 0; 1454 } 1455 1456 again: 1457 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1458 retries); 1459 err = 0; 1460 clnt = fid->clnt; 1461 1462 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1463 if (IS_ERR(req)) { 1464 err = PTR_ERR(req); 1465 goto error; 1466 } 1467 1468 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1469 1470 p9_free_req(clnt, req); 1471 error: 1472 /* 1473 * Fid is not valid even after a failed clunk 1474 * If interrupted, retry once then give up and 1475 * leak fid until umount. 1476 */ 1477 if (err == -ERESTARTSYS) { 1478 if (retries++ == 0) 1479 goto again; 1480 } else 1481 p9_fid_destroy(fid); 1482 return err; 1483 } 1484 EXPORT_SYMBOL(p9_client_clunk); 1485 1486 int p9_client_remove(struct p9_fid *fid) 1487 { 1488 int err; 1489 struct p9_client *clnt; 1490 struct p9_req_t *req; 1491 1492 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1493 err = 0; 1494 clnt = fid->clnt; 1495 1496 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1497 if (IS_ERR(req)) { 1498 err = PTR_ERR(req); 1499 goto error; 1500 } 1501 1502 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1503 1504 p9_free_req(clnt, req); 1505 error: 1506 if (err == -ERESTARTSYS) 1507 p9_client_clunk(fid); 1508 else 1509 p9_fid_destroy(fid); 1510 return err; 1511 } 1512 EXPORT_SYMBOL(p9_client_remove); 1513 1514 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1515 { 1516 int err = 0; 1517 struct p9_req_t *req; 1518 struct p9_client *clnt; 1519 1520 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1521 dfid->fid, name, flags); 1522 1523 clnt = dfid->clnt; 1524 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1525 if (IS_ERR(req)) { 1526 err = PTR_ERR(req); 1527 goto error; 1528 } 1529 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1530 1531 p9_free_req(clnt, req); 1532 error: 1533 return err; 1534 } 1535 EXPORT_SYMBOL(p9_client_unlinkat); 1536 1537 int 1538 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1539 { 1540 struct p9_client *clnt = fid->clnt; 1541 struct p9_req_t *req; 1542 int total = 0; 1543 *err = 0; 1544 1545 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1546 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); 1547 1548 while (iov_iter_count(to)) { 1549 int count = iov_iter_count(to); 1550 int rsize, non_zc = 0; 1551 char *dataptr; 1552 1553 rsize = fid->iounit; 1554 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1555 rsize = clnt->msize - P9_IOHDRSZ; 1556 1557 if (count < rsize) 1558 rsize = count; 1559 1560 /* Don't bother zerocopy for small IO (< 1024) */ 1561 if (clnt->trans_mod->zc_request && rsize > 1024) { 1562 /* 1563 * response header len is 11 1564 * PDU Header(7) + IO Size (4) 1565 */ 1566 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1567 0, 11, "dqd", fid->fid, 1568 offset, rsize); 1569 } else { 1570 non_zc = 1; 1571 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1572 rsize); 1573 } 1574 if (IS_ERR(req)) { 1575 *err = PTR_ERR(req); 1576 break; 1577 } 1578 1579 *err = p9pdu_readf(req->rc, clnt->proto_version, 1580 "D", &count, &dataptr); 1581 if (*err) { 1582 trace_9p_protocol_dump(clnt, req->rc); 1583 p9_free_req(clnt, req); 1584 break; 1585 } 1586 if (rsize < count) { 1587 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1588 count = rsize; 1589 } 1590 1591 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1592 if (!count) { 1593 p9_free_req(clnt, req); 1594 break; 1595 } 1596 1597 if (non_zc) { 1598 int n = copy_to_iter(dataptr, count, to); 1599 total += n; 1600 offset += n; 1601 if (n != count) { 1602 *err = -EFAULT; 1603 p9_free_req(clnt, req); 1604 break; 1605 } 1606 } else { 1607 iov_iter_advance(to, count); 1608 total += count; 1609 offset += count; 1610 } 1611 p9_free_req(clnt, req); 1612 } 1613 return total; 1614 } 1615 EXPORT_SYMBOL(p9_client_read); 1616 1617 int 1618 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1619 { 1620 struct p9_client *clnt = fid->clnt; 1621 struct p9_req_t *req; 1622 int total = 0; 1623 *err = 0; 1624 1625 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1626 fid->fid, (unsigned long long) offset, 1627 iov_iter_count(from)); 1628 1629 while (iov_iter_count(from)) { 1630 int count = iov_iter_count(from); 1631 int rsize = fid->iounit; 1632 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1633 rsize = clnt->msize - P9_IOHDRSZ; 1634 1635 if (count < rsize) 1636 rsize = count; 1637 1638 /* Don't bother zerocopy for small IO (< 1024) */ 1639 if (clnt->trans_mod->zc_request && rsize > 1024) { 1640 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1641 rsize, P9_ZC_HDR_SZ, "dqd", 1642 fid->fid, offset, rsize); 1643 } else { 1644 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1645 offset, rsize, from); 1646 } 1647 if (IS_ERR(req)) { 1648 *err = PTR_ERR(req); 1649 break; 1650 } 1651 1652 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1653 if (*err) { 1654 trace_9p_protocol_dump(clnt, req->rc); 1655 p9_free_req(clnt, req); 1656 break; 1657 } 1658 if (rsize < count) { 1659 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1660 count = rsize; 1661 } 1662 1663 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1664 1665 p9_free_req(clnt, req); 1666 iov_iter_advance(from, count); 1667 total += count; 1668 offset += count; 1669 } 1670 return total; 1671 } 1672 EXPORT_SYMBOL(p9_client_write); 1673 1674 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1675 { 1676 int err; 1677 struct p9_client *clnt; 1678 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1679 struct p9_req_t *req; 1680 u16 ignored; 1681 1682 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1683 1684 if (!ret) 1685 return ERR_PTR(-ENOMEM); 1686 1687 err = 0; 1688 clnt = fid->clnt; 1689 1690 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1691 if (IS_ERR(req)) { 1692 err = PTR_ERR(req); 1693 goto error; 1694 } 1695 1696 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1697 if (err) { 1698 trace_9p_protocol_dump(clnt, req->rc); 1699 p9_free_req(clnt, req); 1700 goto error; 1701 } 1702 1703 p9_debug(P9_DEBUG_9P, 1704 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1705 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1706 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1707 "<<< uid=%d gid=%d n_muid=%d\n", 1708 ret->size, ret->type, ret->dev, ret->qid.type, 1709 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1710 ret->atime, ret->mtime, (unsigned long long)ret->length, 1711 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1712 from_kuid(&init_user_ns, ret->n_uid), 1713 from_kgid(&init_user_ns, ret->n_gid), 1714 from_kuid(&init_user_ns, ret->n_muid)); 1715 1716 p9_free_req(clnt, req); 1717 return ret; 1718 1719 error: 1720 kfree(ret); 1721 return ERR_PTR(err); 1722 } 1723 EXPORT_SYMBOL(p9_client_stat); 1724 1725 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1726 u64 request_mask) 1727 { 1728 int err; 1729 struct p9_client *clnt; 1730 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1731 GFP_KERNEL); 1732 struct p9_req_t *req; 1733 1734 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1735 fid->fid, request_mask); 1736 1737 if (!ret) 1738 return ERR_PTR(-ENOMEM); 1739 1740 err = 0; 1741 clnt = fid->clnt; 1742 1743 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1744 if (IS_ERR(req)) { 1745 err = PTR_ERR(req); 1746 goto error; 1747 } 1748 1749 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1750 if (err) { 1751 trace_9p_protocol_dump(clnt, req->rc); 1752 p9_free_req(clnt, req); 1753 goto error; 1754 } 1755 1756 p9_debug(P9_DEBUG_9P, 1757 "<<< RGETATTR st_result_mask=%lld\n" 1758 "<<< qid=%x.%llx.%x\n" 1759 "<<< st_mode=%8.8x st_nlink=%llu\n" 1760 "<<< st_uid=%d st_gid=%d\n" 1761 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1762 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1763 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1764 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1765 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1766 "<<< st_gen=%lld st_data_version=%lld", 1767 ret->st_result_mask, ret->qid.type, ret->qid.path, 1768 ret->qid.version, ret->st_mode, ret->st_nlink, 1769 from_kuid(&init_user_ns, ret->st_uid), 1770 from_kgid(&init_user_ns, ret->st_gid), 1771 ret->st_rdev, ret->st_size, ret->st_blksize, 1772 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1773 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1774 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1775 ret->st_gen, ret->st_data_version); 1776 1777 p9_free_req(clnt, req); 1778 return ret; 1779 1780 error: 1781 kfree(ret); 1782 return ERR_PTR(err); 1783 } 1784 EXPORT_SYMBOL(p9_client_getattr_dotl); 1785 1786 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1787 { 1788 int ret; 1789 1790 /* NOTE: size shouldn't include its own length */ 1791 /* size[2] type[2] dev[4] qid[13] */ 1792 /* mode[4] atime[4] mtime[4] length[8]*/ 1793 /* name[s] uid[s] gid[s] muid[s] */ 1794 ret = 2+4+13+4+4+4+8+2+2+2+2; 1795 1796 if (wst->name) 1797 ret += strlen(wst->name); 1798 if (wst->uid) 1799 ret += strlen(wst->uid); 1800 if (wst->gid) 1801 ret += strlen(wst->gid); 1802 if (wst->muid) 1803 ret += strlen(wst->muid); 1804 1805 if ((proto_version == p9_proto_2000u) || 1806 (proto_version == p9_proto_2000L)) { 1807 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1808 if (wst->extension) 1809 ret += strlen(wst->extension); 1810 } 1811 1812 return ret; 1813 } 1814 1815 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1816 { 1817 int err; 1818 struct p9_req_t *req; 1819 struct p9_client *clnt; 1820 1821 err = 0; 1822 clnt = fid->clnt; 1823 wst->size = p9_client_statsize(wst, clnt->proto_version); 1824 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1825 p9_debug(P9_DEBUG_9P, 1826 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1827 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1828 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1829 " uid=%d gid=%d n_muid=%d\n", 1830 wst->size, wst->type, wst->dev, wst->qid.type, 1831 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1832 wst->atime, wst->mtime, (unsigned long long)wst->length, 1833 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1834 from_kuid(&init_user_ns, wst->n_uid), 1835 from_kgid(&init_user_ns, wst->n_gid), 1836 from_kuid(&init_user_ns, wst->n_muid)); 1837 1838 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1839 if (IS_ERR(req)) { 1840 err = PTR_ERR(req); 1841 goto error; 1842 } 1843 1844 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1845 1846 p9_free_req(clnt, req); 1847 error: 1848 return err; 1849 } 1850 EXPORT_SYMBOL(p9_client_wstat); 1851 1852 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1853 { 1854 int err; 1855 struct p9_req_t *req; 1856 struct p9_client *clnt; 1857 1858 err = 0; 1859 clnt = fid->clnt; 1860 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1861 p9_debug(P9_DEBUG_9P, 1862 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1863 " atime_sec=%lld atime_nsec=%lld\n" 1864 " mtime_sec=%lld mtime_nsec=%lld\n", 1865 p9attr->valid, p9attr->mode, 1866 from_kuid(&init_user_ns, p9attr->uid), 1867 from_kgid(&init_user_ns, p9attr->gid), 1868 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1869 p9attr->mtime_sec, p9attr->mtime_nsec); 1870 1871 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1872 1873 if (IS_ERR(req)) { 1874 err = PTR_ERR(req); 1875 goto error; 1876 } 1877 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1878 p9_free_req(clnt, req); 1879 error: 1880 return err; 1881 } 1882 EXPORT_SYMBOL(p9_client_setattr); 1883 1884 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1885 { 1886 int err; 1887 struct p9_req_t *req; 1888 struct p9_client *clnt; 1889 1890 err = 0; 1891 clnt = fid->clnt; 1892 1893 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1894 1895 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1896 if (IS_ERR(req)) { 1897 err = PTR_ERR(req); 1898 goto error; 1899 } 1900 1901 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1902 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1903 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1904 if (err) { 1905 trace_9p_protocol_dump(clnt, req->rc); 1906 p9_free_req(clnt, req); 1907 goto error; 1908 } 1909 1910 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1911 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1912 "fsid %llu namelen %ld\n", 1913 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1914 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1915 sb->fsid, (long int)sb->namelen); 1916 1917 p9_free_req(clnt, req); 1918 error: 1919 return err; 1920 } 1921 EXPORT_SYMBOL(p9_client_statfs); 1922 1923 int p9_client_rename(struct p9_fid *fid, 1924 struct p9_fid *newdirfid, const char *name) 1925 { 1926 int err; 1927 struct p9_req_t *req; 1928 struct p9_client *clnt; 1929 1930 err = 0; 1931 clnt = fid->clnt; 1932 1933 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1934 fid->fid, newdirfid->fid, name); 1935 1936 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1937 newdirfid->fid, name); 1938 if (IS_ERR(req)) { 1939 err = PTR_ERR(req); 1940 goto error; 1941 } 1942 1943 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1944 1945 p9_free_req(clnt, req); 1946 error: 1947 return err; 1948 } 1949 EXPORT_SYMBOL(p9_client_rename); 1950 1951 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1952 struct p9_fid *newdirfid, const char *new_name) 1953 { 1954 int err; 1955 struct p9_req_t *req; 1956 struct p9_client *clnt; 1957 1958 err = 0; 1959 clnt = olddirfid->clnt; 1960 1961 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1962 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1963 newdirfid->fid, new_name); 1964 1965 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1966 old_name, newdirfid->fid, new_name); 1967 if (IS_ERR(req)) { 1968 err = PTR_ERR(req); 1969 goto error; 1970 } 1971 1972 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1973 newdirfid->fid, new_name); 1974 1975 p9_free_req(clnt, req); 1976 error: 1977 return err; 1978 } 1979 EXPORT_SYMBOL(p9_client_renameat); 1980 1981 /* 1982 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1983 */ 1984 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1985 const char *attr_name, u64 *attr_size) 1986 { 1987 int err; 1988 struct p9_req_t *req; 1989 struct p9_client *clnt; 1990 struct p9_fid *attr_fid; 1991 1992 err = 0; 1993 clnt = file_fid->clnt; 1994 attr_fid = p9_fid_create(clnt); 1995 if (IS_ERR(attr_fid)) { 1996 err = PTR_ERR(attr_fid); 1997 attr_fid = NULL; 1998 goto error; 1999 } 2000 p9_debug(P9_DEBUG_9P, 2001 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2002 file_fid->fid, attr_fid->fid, attr_name); 2003 2004 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2005 file_fid->fid, attr_fid->fid, attr_name); 2006 if (IS_ERR(req)) { 2007 err = PTR_ERR(req); 2008 goto error; 2009 } 2010 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 2011 if (err) { 2012 trace_9p_protocol_dump(clnt, req->rc); 2013 p9_free_req(clnt, req); 2014 goto clunk_fid; 2015 } 2016 p9_free_req(clnt, req); 2017 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2018 attr_fid->fid, *attr_size); 2019 return attr_fid; 2020 clunk_fid: 2021 p9_client_clunk(attr_fid); 2022 attr_fid = NULL; 2023 error: 2024 if (attr_fid && (attr_fid != file_fid)) 2025 p9_fid_destroy(attr_fid); 2026 2027 return ERR_PTR(err); 2028 } 2029 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2030 2031 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2032 u64 attr_size, int flags) 2033 { 2034 int err; 2035 struct p9_req_t *req; 2036 struct p9_client *clnt; 2037 2038 p9_debug(P9_DEBUG_9P, 2039 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2040 fid->fid, name, (long long)attr_size, flags); 2041 err = 0; 2042 clnt = fid->clnt; 2043 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2044 fid->fid, name, attr_size, flags); 2045 if (IS_ERR(req)) { 2046 err = PTR_ERR(req); 2047 goto error; 2048 } 2049 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2050 p9_free_req(clnt, req); 2051 error: 2052 return err; 2053 } 2054 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2055 2056 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2057 { 2058 int err, rsize, non_zc = 0; 2059 struct p9_client *clnt; 2060 struct p9_req_t *req; 2061 char *dataptr; 2062 struct kvec kv = {.iov_base = data, .iov_len = count}; 2063 struct iov_iter to; 2064 2065 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count); 2066 2067 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2068 fid->fid, (unsigned long long) offset, count); 2069 2070 err = 0; 2071 clnt = fid->clnt; 2072 2073 rsize = fid->iounit; 2074 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2075 rsize = clnt->msize - P9_READDIRHDRSZ; 2076 2077 if (count < rsize) 2078 rsize = count; 2079 2080 /* Don't bother zerocopy for small IO (< 1024) */ 2081 if (clnt->trans_mod->zc_request && rsize > 1024) { 2082 /* 2083 * response header len is 11 2084 * PDU Header(7) + IO Size (4) 2085 */ 2086 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2087 11, "dqd", fid->fid, offset, rsize); 2088 } else { 2089 non_zc = 1; 2090 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2091 offset, rsize); 2092 } 2093 if (IS_ERR(req)) { 2094 err = PTR_ERR(req); 2095 goto error; 2096 } 2097 2098 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 2099 if (err) { 2100 trace_9p_protocol_dump(clnt, req->rc); 2101 goto free_and_error; 2102 } 2103 if (rsize < count) { 2104 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2105 count = rsize; 2106 } 2107 2108 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2109 2110 if (non_zc) 2111 memmove(data, dataptr, count); 2112 2113 p9_free_req(clnt, req); 2114 return count; 2115 2116 free_and_error: 2117 p9_free_req(clnt, req); 2118 error: 2119 return err; 2120 } 2121 EXPORT_SYMBOL(p9_client_readdir); 2122 2123 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2124 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2125 { 2126 int err; 2127 struct p9_client *clnt; 2128 struct p9_req_t *req; 2129 2130 err = 0; 2131 clnt = fid->clnt; 2132 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2133 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2134 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2135 MAJOR(rdev), MINOR(rdev), gid); 2136 if (IS_ERR(req)) 2137 return PTR_ERR(req); 2138 2139 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2140 if (err) { 2141 trace_9p_protocol_dump(clnt, req->rc); 2142 goto error; 2143 } 2144 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2145 (unsigned long long)qid->path, qid->version); 2146 2147 error: 2148 p9_free_req(clnt, req); 2149 return err; 2150 2151 } 2152 EXPORT_SYMBOL(p9_client_mknod_dotl); 2153 2154 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2155 kgid_t gid, struct p9_qid *qid) 2156 { 2157 int err; 2158 struct p9_client *clnt; 2159 struct p9_req_t *req; 2160 2161 err = 0; 2162 clnt = fid->clnt; 2163 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2164 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2165 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2166 gid); 2167 if (IS_ERR(req)) 2168 return PTR_ERR(req); 2169 2170 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2171 if (err) { 2172 trace_9p_protocol_dump(clnt, req->rc); 2173 goto error; 2174 } 2175 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2176 (unsigned long long)qid->path, qid->version); 2177 2178 error: 2179 p9_free_req(clnt, req); 2180 return err; 2181 2182 } 2183 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2184 2185 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2186 { 2187 int err; 2188 struct p9_client *clnt; 2189 struct p9_req_t *req; 2190 2191 err = 0; 2192 clnt = fid->clnt; 2193 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2194 "start %lld length %lld proc_id %d client_id %s\n", 2195 fid->fid, flock->type, flock->flags, flock->start, 2196 flock->length, flock->proc_id, flock->client_id); 2197 2198 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2199 flock->flags, flock->start, flock->length, 2200 flock->proc_id, flock->client_id); 2201 2202 if (IS_ERR(req)) 2203 return PTR_ERR(req); 2204 2205 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); 2206 if (err) { 2207 trace_9p_protocol_dump(clnt, req->rc); 2208 goto error; 2209 } 2210 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2211 error: 2212 p9_free_req(clnt, req); 2213 return err; 2214 2215 } 2216 EXPORT_SYMBOL(p9_client_lock_dotl); 2217 2218 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2219 { 2220 int err; 2221 struct p9_client *clnt; 2222 struct p9_req_t *req; 2223 2224 err = 0; 2225 clnt = fid->clnt; 2226 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2227 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2228 glock->start, glock->length, glock->proc_id, glock->client_id); 2229 2230 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2231 glock->start, glock->length, glock->proc_id, glock->client_id); 2232 2233 if (IS_ERR(req)) 2234 return PTR_ERR(req); 2235 2236 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, 2237 &glock->start, &glock->length, &glock->proc_id, 2238 &glock->client_id); 2239 if (err) { 2240 trace_9p_protocol_dump(clnt, req->rc); 2241 goto error; 2242 } 2243 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2244 "proc_id %d client_id %s\n", glock->type, glock->start, 2245 glock->length, glock->proc_id, glock->client_id); 2246 error: 2247 p9_free_req(clnt, req); 2248 return err; 2249 } 2250 EXPORT_SYMBOL(p9_client_getlock_dotl); 2251 2252 int p9_client_readlink(struct p9_fid *fid, char **target) 2253 { 2254 int err; 2255 struct p9_client *clnt; 2256 struct p9_req_t *req; 2257 2258 err = 0; 2259 clnt = fid->clnt; 2260 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2261 2262 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2263 if (IS_ERR(req)) 2264 return PTR_ERR(req); 2265 2266 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); 2267 if (err) { 2268 trace_9p_protocol_dump(clnt, req->rc); 2269 goto error; 2270 } 2271 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2272 error: 2273 p9_free_req(clnt, req); 2274 return err; 2275 } 2276 EXPORT_SYMBOL(p9_client_readlink); 2277