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 <linux/seq_file.h> 41 #include <net/9p/client.h> 42 #include <net/9p/transport.h> 43 #include "protocol.h" 44 45 #define CREATE_TRACE_POINTS 46 #include <trace/events/9p.h> 47 48 /* 49 * Client Option Parsing (code inspired by NFS code) 50 * - a little lazy - parse all client options 51 */ 52 53 enum { 54 Opt_msize, 55 Opt_trans, 56 Opt_legacy, 57 Opt_version, 58 Opt_err, 59 }; 60 61 static const match_table_t tokens = { 62 {Opt_msize, "msize=%u"}, 63 {Opt_legacy, "noextend"}, 64 {Opt_trans, "trans=%s"}, 65 {Opt_version, "version=%s"}, 66 {Opt_err, NULL}, 67 }; 68 69 inline int p9_is_proto_dotl(struct p9_client *clnt) 70 { 71 return clnt->proto_version == p9_proto_2000L; 72 } 73 EXPORT_SYMBOL(p9_is_proto_dotl); 74 75 inline int p9_is_proto_dotu(struct p9_client *clnt) 76 { 77 return clnt->proto_version == p9_proto_2000u; 78 } 79 EXPORT_SYMBOL(p9_is_proto_dotu); 80 81 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) 82 { 83 if (clnt->msize != 8192) 84 seq_printf(m, ",msize=%u", clnt->msize); 85 seq_printf(m, ",trans=%s", clnt->trans_mod->name); 86 87 switch (clnt->proto_version) { 88 case p9_proto_legacy: 89 seq_puts(m, ",noextend"); 90 break; 91 case p9_proto_2000u: 92 seq_puts(m, ",version=9p2000.u"); 93 break; 94 case p9_proto_2000L: 95 /* Default */ 96 break; 97 } 98 99 if (clnt->trans_mod->show_options) 100 return clnt->trans_mod->show_options(m, clnt); 101 return 0; 102 } 103 EXPORT_SYMBOL(p9_show_client_options); 104 105 /* 106 * Some error codes are taken directly from the server replies, 107 * make sure they are valid. 108 */ 109 static int safe_errno(int err) 110 { 111 if ((err > 0) || (err < -MAX_ERRNO)) { 112 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); 113 return -EPROTO; 114 } 115 return err; 116 } 117 118 119 /* Interpret mount option for protocol version */ 120 static int get_protocol_version(char *s) 121 { 122 int version = -EINVAL; 123 124 if (!strcmp(s, "9p2000")) { 125 version = p9_proto_legacy; 126 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); 127 } else if (!strcmp(s, "9p2000.u")) { 128 version = p9_proto_2000u; 129 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); 130 } else if (!strcmp(s, "9p2000.L")) { 131 version = p9_proto_2000L; 132 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); 133 } else 134 pr_info("Unknown protocol version %s\n", s); 135 136 return version; 137 } 138 139 /** 140 * parse_options - parse mount options into client structure 141 * @opts: options string passed from mount 142 * @clnt: existing v9fs client information 143 * 144 * Return 0 upon success, -ERRNO upon failure 145 */ 146 147 static int parse_opts(char *opts, struct p9_client *clnt) 148 { 149 char *options, *tmp_options; 150 char *p; 151 substring_t args[MAX_OPT_ARGS]; 152 int option; 153 char *s; 154 int ret = 0; 155 156 clnt->proto_version = p9_proto_2000L; 157 clnt->msize = 8192; 158 159 if (!opts) 160 return 0; 161 162 tmp_options = kstrdup(opts, GFP_KERNEL); 163 if (!tmp_options) { 164 p9_debug(P9_DEBUG_ERROR, 165 "failed to allocate copy of option string\n"); 166 return -ENOMEM; 167 } 168 options = tmp_options; 169 170 while ((p = strsep(&options, ",")) != NULL) { 171 int token, r; 172 if (!*p) 173 continue; 174 token = match_token(p, tokens, args); 175 switch (token) { 176 case Opt_msize: 177 r = match_int(&args[0], &option); 178 if (r < 0) { 179 p9_debug(P9_DEBUG_ERROR, 180 "integer field, but no integer?\n"); 181 ret = r; 182 continue; 183 } 184 clnt->msize = option; 185 break; 186 case Opt_trans: 187 s = match_strdup(&args[0]); 188 if (!s) { 189 ret = -ENOMEM; 190 p9_debug(P9_DEBUG_ERROR, 191 "problem allocating copy of trans arg\n"); 192 goto free_and_return; 193 } 194 195 v9fs_put_trans(clnt->trans_mod); 196 clnt->trans_mod = v9fs_get_trans_by_name(s); 197 if (clnt->trans_mod == NULL) { 198 pr_info("Could not find request transport: %s\n", 199 s); 200 ret = -EINVAL; 201 } 202 kfree(s); 203 break; 204 case Opt_legacy: 205 clnt->proto_version = p9_proto_legacy; 206 break; 207 case Opt_version: 208 s = match_strdup(&args[0]); 209 if (!s) { 210 ret = -ENOMEM; 211 p9_debug(P9_DEBUG_ERROR, 212 "problem allocating copy of version arg\n"); 213 goto free_and_return; 214 } 215 r = get_protocol_version(s); 216 if (r < 0) 217 ret = r; 218 else 219 clnt->proto_version = r; 220 kfree(s); 221 break; 222 default: 223 continue; 224 } 225 } 226 227 free_and_return: 228 if (ret) 229 v9fs_put_trans(clnt->trans_mod); 230 kfree(tmp_options); 231 return ret; 232 } 233 234 static struct p9_fcall *p9_fcall_alloc(int alloc_msize) 235 { 236 struct p9_fcall *fc; 237 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS); 238 if (!fc) 239 return NULL; 240 fc->capacity = alloc_msize; 241 fc->sdata = (char *) fc + sizeof(struct p9_fcall); 242 return fc; 243 } 244 245 /** 246 * p9_tag_alloc - lookup/allocate a request by tag 247 * @c: client session to lookup tag within 248 * @tag: numeric id for transaction 249 * 250 * this is a simple array lookup, but will grow the 251 * request_slots as necessary to accommodate transaction 252 * ids which did not previously have a slot. 253 * 254 * this code relies on the client spinlock to manage locks, its 255 * possible we should switch to something else, but I'd rather 256 * stick with something low-overhead for the common case. 257 * 258 */ 259 260 static struct p9_req_t * 261 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size) 262 { 263 unsigned long flags; 264 int row, col; 265 struct p9_req_t *req; 266 int alloc_msize = min(c->msize, max_size); 267 268 /* This looks up the original request by tag so we know which 269 * buffer to read the data into */ 270 tag++; 271 272 if (tag >= c->max_tag) { 273 spin_lock_irqsave(&c->lock, flags); 274 /* check again since original check was outside of lock */ 275 while (tag >= c->max_tag) { 276 row = (tag / P9_ROW_MAXTAG); 277 c->reqs[row] = kcalloc(P9_ROW_MAXTAG, 278 sizeof(struct p9_req_t), GFP_ATOMIC); 279 280 if (!c->reqs[row]) { 281 pr_err("Couldn't grow tag array\n"); 282 spin_unlock_irqrestore(&c->lock, flags); 283 return ERR_PTR(-ENOMEM); 284 } 285 for (col = 0; col < P9_ROW_MAXTAG; col++) { 286 req = &c->reqs[row][col]; 287 req->status = REQ_STATUS_IDLE; 288 init_waitqueue_head(&req->wq); 289 } 290 c->max_tag += P9_ROW_MAXTAG; 291 } 292 spin_unlock_irqrestore(&c->lock, flags); 293 } 294 row = tag / P9_ROW_MAXTAG; 295 col = tag % P9_ROW_MAXTAG; 296 297 req = &c->reqs[row][col]; 298 if (!req->tc) 299 req->tc = p9_fcall_alloc(alloc_msize); 300 if (!req->rc) 301 req->rc = p9_fcall_alloc(alloc_msize); 302 if (!req->tc || !req->rc) 303 goto grow_failed; 304 305 p9pdu_reset(req->tc); 306 p9pdu_reset(req->rc); 307 308 req->tc->tag = tag-1; 309 req->status = REQ_STATUS_ALLOC; 310 311 return req; 312 313 grow_failed: 314 pr_err("Couldn't grow tag array\n"); 315 kfree(req->tc); 316 kfree(req->rc); 317 req->tc = req->rc = NULL; 318 return ERR_PTR(-ENOMEM); 319 } 320 321 /** 322 * p9_tag_lookup - lookup a request by tag 323 * @c: client session to lookup tag within 324 * @tag: numeric id for transaction 325 * 326 */ 327 328 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) 329 { 330 int row, col; 331 332 /* This looks up the original request by tag so we know which 333 * buffer to read the data into */ 334 tag++; 335 336 if (tag >= c->max_tag) 337 return NULL; 338 339 row = tag / P9_ROW_MAXTAG; 340 col = tag % P9_ROW_MAXTAG; 341 342 return &c->reqs[row][col]; 343 } 344 EXPORT_SYMBOL(p9_tag_lookup); 345 346 /** 347 * p9_tag_init - setup tags structure and contents 348 * @c: v9fs client struct 349 * 350 * This initializes the tags structure for each client instance. 351 * 352 */ 353 354 static int p9_tag_init(struct p9_client *c) 355 { 356 int err = 0; 357 358 c->tagpool = p9_idpool_create(); 359 if (IS_ERR(c->tagpool)) { 360 err = PTR_ERR(c->tagpool); 361 goto error; 362 } 363 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */ 364 if (err < 0) { 365 p9_idpool_destroy(c->tagpool); 366 goto error; 367 } 368 c->max_tag = 0; 369 error: 370 return err; 371 } 372 373 /** 374 * p9_tag_cleanup - cleans up tags structure and reclaims resources 375 * @c: v9fs client struct 376 * 377 * This frees resources associated with the tags structure 378 * 379 */ 380 static void p9_tag_cleanup(struct p9_client *c) 381 { 382 int row, col; 383 384 /* check to insure all requests are idle */ 385 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 386 for (col = 0; col < P9_ROW_MAXTAG; col++) { 387 if (c->reqs[row][col].status != REQ_STATUS_IDLE) { 388 p9_debug(P9_DEBUG_MUX, 389 "Attempting to cleanup non-free tag %d,%d\n", 390 row, col); 391 /* TODO: delay execution of cleanup */ 392 return; 393 } 394 } 395 } 396 397 if (c->tagpool) { 398 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */ 399 p9_idpool_destroy(c->tagpool); 400 } 401 402 /* free requests associated with tags */ 403 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { 404 for (col = 0; col < P9_ROW_MAXTAG; col++) { 405 kfree(c->reqs[row][col].tc); 406 kfree(c->reqs[row][col].rc); 407 } 408 kfree(c->reqs[row]); 409 } 410 c->max_tag = 0; 411 } 412 413 /** 414 * p9_free_req - free a request and clean-up as necessary 415 * c: client state 416 * r: request to release 417 * 418 */ 419 420 static void p9_free_req(struct p9_client *c, struct p9_req_t *r) 421 { 422 int tag = r->tc->tag; 423 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); 424 425 r->status = REQ_STATUS_IDLE; 426 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) 427 p9_idpool_put(tag, c->tagpool); 428 } 429 430 /** 431 * p9_client_cb - call back from transport to client 432 * c: client state 433 * req: request received 434 * 435 */ 436 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) 437 { 438 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); 439 440 /* 441 * This barrier is needed to make sure any change made to req before 442 * the status change is visible to another thread 443 */ 444 smp_wmb(); 445 req->status = status; 446 447 wake_up(&req->wq); 448 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); 449 } 450 EXPORT_SYMBOL(p9_client_cb); 451 452 /** 453 * p9_parse_header - parse header arguments out of a packet 454 * @pdu: packet to parse 455 * @size: size of packet 456 * @type: type of request 457 * @tag: tag of packet 458 * @rewind: set if we need to rewind offset afterwards 459 */ 460 461 int 462 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, 463 int rewind) 464 { 465 int8_t r_type; 466 int16_t r_tag; 467 int32_t r_size; 468 int offset = pdu->offset; 469 int err; 470 471 pdu->offset = 0; 472 473 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); 474 if (err) 475 goto rewind_and_exit; 476 477 if (type) 478 *type = r_type; 479 if (tag) 480 *tag = r_tag; 481 if (size) 482 *size = r_size; 483 484 if (pdu->size != r_size || r_size < 7) { 485 err = -EINVAL; 486 goto rewind_and_exit; 487 } 488 489 pdu->id = r_type; 490 pdu->tag = r_tag; 491 492 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", 493 pdu->size, pdu->id, pdu->tag); 494 495 rewind_and_exit: 496 if (rewind) 497 pdu->offset = offset; 498 return err; 499 } 500 EXPORT_SYMBOL(p9_parse_header); 501 502 /** 503 * p9_check_errors - check 9p packet for error return and process it 504 * @c: current client instance 505 * @req: request to parse and check for error conditions 506 * 507 * returns error code if one is discovered, otherwise returns 0 508 * 509 * this will have to be more complicated if we have multiple 510 * error packet types 511 */ 512 513 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) 514 { 515 int8_t type; 516 int err; 517 int ecode; 518 519 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 520 if (req->rc->size >= c->msize) { 521 p9_debug(P9_DEBUG_ERROR, 522 "requested packet size too big: %d\n", 523 req->rc->size); 524 return -EIO; 525 } 526 /* 527 * dump the response from server 528 * This should be after check errors which poplulate pdu_fcall. 529 */ 530 trace_9p_protocol_dump(c, req->rc); 531 if (err) { 532 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 533 return err; 534 } 535 if (type != P9_RERROR && type != P9_RLERROR) 536 return 0; 537 538 if (!p9_is_proto_dotl(c)) { 539 char *ename; 540 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 541 &ename, &ecode); 542 if (err) 543 goto out_err; 544 545 if (p9_is_proto_dotu(c) && ecode < 512) 546 err = -ecode; 547 548 if (!err) { 549 err = p9_errstr2errno(ename, strlen(ename)); 550 551 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 552 -ecode, ename); 553 } 554 kfree(ename); 555 } else { 556 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 557 err = -ecode; 558 559 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 560 } 561 562 return err; 563 564 out_err: 565 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 566 567 return err; 568 } 569 570 /** 571 * p9_check_zc_errors - check 9p packet for error return and process it 572 * @c: current client instance 573 * @req: request to parse and check for error conditions 574 * @in_hdrlen: Size of response protocol buffer. 575 * 576 * returns error code if one is discovered, otherwise returns 0 577 * 578 * this will have to be more complicated if we have multiple 579 * error packet types 580 */ 581 582 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, 583 struct iov_iter *uidata, int in_hdrlen) 584 { 585 int err; 586 int ecode; 587 int8_t type; 588 char *ename = NULL; 589 590 err = p9_parse_header(req->rc, NULL, &type, NULL, 0); 591 /* 592 * dump the response from server 593 * This should be after parse_header which poplulate pdu_fcall. 594 */ 595 trace_9p_protocol_dump(c, req->rc); 596 if (err) { 597 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); 598 return err; 599 } 600 601 if (type != P9_RERROR && type != P9_RLERROR) 602 return 0; 603 604 if (!p9_is_proto_dotl(c)) { 605 /* Error is reported in string format */ 606 int len; 607 /* 7 = header size for RERROR; */ 608 int inline_len = in_hdrlen - 7; 609 610 len = req->rc->size - req->rc->offset; 611 if (len > (P9_ZC_HDR_SZ - 7)) { 612 err = -EFAULT; 613 goto out_err; 614 } 615 616 ename = &req->rc->sdata[req->rc->offset]; 617 if (len > inline_len) { 618 /* We have error in external buffer */ 619 if (!copy_from_iter_full(ename + inline_len, 620 len - inline_len, uidata)) { 621 err = -EFAULT; 622 goto out_err; 623 } 624 } 625 ename = NULL; 626 err = p9pdu_readf(req->rc, c->proto_version, "s?d", 627 &ename, &ecode); 628 if (err) 629 goto out_err; 630 631 if (p9_is_proto_dotu(c) && ecode < 512) 632 err = -ecode; 633 634 if (!err) { 635 err = p9_errstr2errno(ename, strlen(ename)); 636 637 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", 638 -ecode, ename); 639 } 640 kfree(ename); 641 } else { 642 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode); 643 err = -ecode; 644 645 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); 646 } 647 return err; 648 649 out_err: 650 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); 651 return err; 652 } 653 654 static struct p9_req_t * 655 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); 656 657 /** 658 * p9_client_flush - flush (cancel) a request 659 * @c: client state 660 * @oldreq: request to cancel 661 * 662 * This sents a flush for a particular request and links 663 * the flush request to the original request. The current 664 * code only supports a single flush request although the protocol 665 * allows for multiple flush requests to be sent for a single request. 666 * 667 */ 668 669 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) 670 { 671 struct p9_req_t *req; 672 int16_t oldtag; 673 int err; 674 675 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); 676 if (err) 677 return err; 678 679 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); 680 681 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); 682 if (IS_ERR(req)) 683 return PTR_ERR(req); 684 685 /* 686 * if we haven't received a response for oldreq, 687 * remove it from the list 688 */ 689 if (oldreq->status == REQ_STATUS_SENT) 690 if (c->trans_mod->cancelled) 691 c->trans_mod->cancelled(c, oldreq); 692 693 p9_free_req(c, req); 694 return 0; 695 } 696 697 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, 698 int8_t type, int req_size, 699 const char *fmt, va_list ap) 700 { 701 int tag, err; 702 struct p9_req_t *req; 703 704 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); 705 706 /* we allow for any status other than disconnected */ 707 if (c->status == Disconnected) 708 return ERR_PTR(-EIO); 709 710 /* if status is begin_disconnected we allow only clunk request */ 711 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) 712 return ERR_PTR(-EIO); 713 714 tag = P9_NOTAG; 715 if (type != P9_TVERSION) { 716 tag = p9_idpool_get(c->tagpool); 717 if (tag < 0) 718 return ERR_PTR(-ENOMEM); 719 } 720 721 req = p9_tag_alloc(c, tag, req_size); 722 if (IS_ERR(req)) 723 return req; 724 725 /* marshall the data */ 726 p9pdu_prepare(req->tc, tag, type); 727 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); 728 if (err) 729 goto reterr; 730 p9pdu_finalize(c, req->tc); 731 trace_9p_client_req(c, type, tag); 732 return req; 733 reterr: 734 p9_free_req(c, req); 735 return ERR_PTR(err); 736 } 737 738 /** 739 * p9_client_rpc - issue a request and wait for a response 740 * @c: client session 741 * @type: type of request 742 * @fmt: protocol format string (see protocol.c) 743 * 744 * Returns request structure (which client must free using p9_free_req) 745 */ 746 747 static struct p9_req_t * 748 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) 749 { 750 va_list ap; 751 int sigpending, err; 752 unsigned long flags; 753 struct p9_req_t *req; 754 755 va_start(ap, fmt); 756 req = p9_client_prepare_req(c, type, c->msize, fmt, ap); 757 va_end(ap); 758 if (IS_ERR(req)) 759 return req; 760 761 if (signal_pending(current)) { 762 sigpending = 1; 763 clear_thread_flag(TIF_SIGPENDING); 764 } else 765 sigpending = 0; 766 767 err = c->trans_mod->request(c, req); 768 if (err < 0) { 769 if (err != -ERESTARTSYS && err != -EFAULT) 770 c->status = Disconnected; 771 goto recalc_sigpending; 772 } 773 again: 774 /* Wait for the response */ 775 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); 776 777 /* 778 * Make sure our req is coherent with regard to updates in other 779 * threads - echoes to wmb() in the callback 780 */ 781 smp_rmb(); 782 783 if ((err == -ERESTARTSYS) && (c->status == Connected) 784 && (type == P9_TFLUSH)) { 785 sigpending = 1; 786 clear_thread_flag(TIF_SIGPENDING); 787 goto again; 788 } 789 790 if (req->status == REQ_STATUS_ERROR) { 791 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 792 err = req->t_err; 793 } 794 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 795 p9_debug(P9_DEBUG_MUX, "flushing\n"); 796 sigpending = 1; 797 clear_thread_flag(TIF_SIGPENDING); 798 799 if (c->trans_mod->cancel(c, req)) 800 p9_client_flush(c, req); 801 802 /* if we received the response anyway, don't signal error */ 803 if (req->status == REQ_STATUS_RCVD) 804 err = 0; 805 } 806 recalc_sigpending: 807 if (sigpending) { 808 spin_lock_irqsave(¤t->sighand->siglock, flags); 809 recalc_sigpending(); 810 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 811 } 812 if (err < 0) 813 goto reterr; 814 815 err = p9_check_errors(c, req); 816 trace_9p_client_res(c, type, req->rc->tag, err); 817 if (!err) 818 return req; 819 reterr: 820 p9_free_req(c, req); 821 return ERR_PTR(safe_errno(err)); 822 } 823 824 /** 825 * p9_client_zc_rpc - issue a request and wait for a response 826 * @c: client session 827 * @type: type of request 828 * @uidata: destination for zero copy read 829 * @uodata: source for zero copy write 830 * @inlen: read buffer size 831 * @olen: write buffer size 832 * @hdrlen: reader header size, This is the size of response protocol data 833 * @fmt: protocol format string (see protocol.c) 834 * 835 * Returns request structure (which client must free using p9_free_req) 836 */ 837 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, 838 struct iov_iter *uidata, 839 struct iov_iter *uodata, 840 int inlen, int olen, int in_hdrlen, 841 const char *fmt, ...) 842 { 843 va_list ap; 844 int sigpending, err; 845 unsigned long flags; 846 struct p9_req_t *req; 847 848 va_start(ap, fmt); 849 /* 850 * We allocate a inline protocol data of only 4k bytes. 851 * The actual content is passed in zero-copy fashion. 852 */ 853 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); 854 va_end(ap); 855 if (IS_ERR(req)) 856 return req; 857 858 if (signal_pending(current)) { 859 sigpending = 1; 860 clear_thread_flag(TIF_SIGPENDING); 861 } else 862 sigpending = 0; 863 864 err = c->trans_mod->zc_request(c, req, uidata, uodata, 865 inlen, olen, in_hdrlen); 866 if (err < 0) { 867 if (err == -EIO) 868 c->status = Disconnected; 869 if (err != -ERESTARTSYS) 870 goto recalc_sigpending; 871 } 872 if (req->status == REQ_STATUS_ERROR) { 873 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); 874 err = req->t_err; 875 } 876 if ((err == -ERESTARTSYS) && (c->status == Connected)) { 877 p9_debug(P9_DEBUG_MUX, "flushing\n"); 878 sigpending = 1; 879 clear_thread_flag(TIF_SIGPENDING); 880 881 if (c->trans_mod->cancel(c, req)) 882 p9_client_flush(c, req); 883 884 /* if we received the response anyway, don't signal error */ 885 if (req->status == REQ_STATUS_RCVD) 886 err = 0; 887 } 888 recalc_sigpending: 889 if (sigpending) { 890 spin_lock_irqsave(¤t->sighand->siglock, flags); 891 recalc_sigpending(); 892 spin_unlock_irqrestore(¤t->sighand->siglock, flags); 893 } 894 if (err < 0) 895 goto reterr; 896 897 err = p9_check_zc_errors(c, req, uidata, in_hdrlen); 898 trace_9p_client_res(c, type, req->rc->tag, err); 899 if (!err) 900 return req; 901 reterr: 902 p9_free_req(c, req); 903 return ERR_PTR(safe_errno(err)); 904 } 905 906 static struct p9_fid *p9_fid_create(struct p9_client *clnt) 907 { 908 int ret; 909 struct p9_fid *fid; 910 911 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); 912 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); 913 if (!fid) 914 return NULL; 915 916 memset(&fid->qid, 0, sizeof(struct p9_qid)); 917 fid->mode = -1; 918 fid->uid = current_fsuid(); 919 fid->clnt = clnt; 920 fid->rdir = NULL; 921 fid->fid = 0; 922 923 idr_preload(GFP_KERNEL); 924 spin_lock_irq(&clnt->lock); 925 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, 926 GFP_NOWAIT); 927 spin_unlock_irq(&clnt->lock); 928 idr_preload_end(); 929 930 if (!ret) 931 return fid; 932 933 kfree(fid); 934 return NULL; 935 } 936 937 static void p9_fid_destroy(struct p9_fid *fid) 938 { 939 struct p9_client *clnt; 940 unsigned long flags; 941 942 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); 943 clnt = fid->clnt; 944 spin_lock_irqsave(&clnt->lock, flags); 945 idr_remove(&clnt->fids, fid->fid); 946 spin_unlock_irqrestore(&clnt->lock, flags); 947 kfree(fid->rdir); 948 kfree(fid); 949 } 950 951 static int p9_client_version(struct p9_client *c) 952 { 953 int err = 0; 954 struct p9_req_t *req; 955 char *version = NULL; 956 int msize; 957 958 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", 959 c->msize, c->proto_version); 960 961 switch (c->proto_version) { 962 case p9_proto_2000L: 963 req = p9_client_rpc(c, P9_TVERSION, "ds", 964 c->msize, "9P2000.L"); 965 break; 966 case p9_proto_2000u: 967 req = p9_client_rpc(c, P9_TVERSION, "ds", 968 c->msize, "9P2000.u"); 969 break; 970 case p9_proto_legacy: 971 req = p9_client_rpc(c, P9_TVERSION, "ds", 972 c->msize, "9P2000"); 973 break; 974 default: 975 return -EINVAL; 976 } 977 978 if (IS_ERR(req)) 979 return PTR_ERR(req); 980 981 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); 982 if (err) { 983 p9_debug(P9_DEBUG_9P, "version error %d\n", err); 984 trace_9p_protocol_dump(c, req->rc); 985 goto error; 986 } 987 988 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); 989 if (!strncmp(version, "9P2000.L", 8)) 990 c->proto_version = p9_proto_2000L; 991 else if (!strncmp(version, "9P2000.u", 8)) 992 c->proto_version = p9_proto_2000u; 993 else if (!strncmp(version, "9P2000", 6)) 994 c->proto_version = p9_proto_legacy; 995 else { 996 err = -EREMOTEIO; 997 goto error; 998 } 999 1000 if (msize < c->msize) 1001 c->msize = msize; 1002 1003 error: 1004 kfree(version); 1005 p9_free_req(c, req); 1006 1007 return err; 1008 } 1009 1010 struct p9_client *p9_client_create(const char *dev_name, char *options) 1011 { 1012 int err; 1013 struct p9_client *clnt; 1014 char *client_id; 1015 1016 err = 0; 1017 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); 1018 if (!clnt) 1019 return ERR_PTR(-ENOMEM); 1020 1021 clnt->trans_mod = NULL; 1022 clnt->trans = NULL; 1023 1024 client_id = utsname()->nodename; 1025 memcpy(clnt->name, client_id, strlen(client_id) + 1); 1026 1027 spin_lock_init(&clnt->lock); 1028 idr_init(&clnt->fids); 1029 1030 err = p9_tag_init(clnt); 1031 if (err < 0) 1032 goto free_client; 1033 1034 err = parse_opts(options, clnt); 1035 if (err < 0) 1036 goto destroy_tagpool; 1037 1038 if (!clnt->trans_mod) 1039 clnt->trans_mod = v9fs_get_default_trans(); 1040 1041 if (clnt->trans_mod == NULL) { 1042 err = -EPROTONOSUPPORT; 1043 p9_debug(P9_DEBUG_ERROR, 1044 "No transport defined or default transport\n"); 1045 goto destroy_tagpool; 1046 } 1047 1048 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", 1049 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); 1050 1051 err = clnt->trans_mod->create(clnt, dev_name, options); 1052 if (err) 1053 goto put_trans; 1054 1055 if (clnt->msize > clnt->trans_mod->maxsize) 1056 clnt->msize = clnt->trans_mod->maxsize; 1057 1058 err = p9_client_version(clnt); 1059 if (err) 1060 goto close_trans; 1061 1062 return clnt; 1063 1064 close_trans: 1065 clnt->trans_mod->close(clnt); 1066 put_trans: 1067 v9fs_put_trans(clnt->trans_mod); 1068 destroy_tagpool: 1069 p9_idpool_destroy(clnt->tagpool); 1070 free_client: 1071 kfree(clnt); 1072 return ERR_PTR(err); 1073 } 1074 EXPORT_SYMBOL(p9_client_create); 1075 1076 void p9_client_destroy(struct p9_client *clnt) 1077 { 1078 struct p9_fid *fid; 1079 int id; 1080 1081 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); 1082 1083 if (clnt->trans_mod) 1084 clnt->trans_mod->close(clnt); 1085 1086 v9fs_put_trans(clnt->trans_mod); 1087 1088 idr_for_each_entry(&clnt->fids, fid, id) { 1089 pr_info("Found fid %d not clunked\n", fid->fid); 1090 p9_fid_destroy(fid); 1091 } 1092 1093 p9_tag_cleanup(clnt); 1094 1095 kfree(clnt); 1096 } 1097 EXPORT_SYMBOL(p9_client_destroy); 1098 1099 void p9_client_disconnect(struct p9_client *clnt) 1100 { 1101 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1102 clnt->status = Disconnected; 1103 } 1104 EXPORT_SYMBOL(p9_client_disconnect); 1105 1106 void p9_client_begin_disconnect(struct p9_client *clnt) 1107 { 1108 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); 1109 clnt->status = BeginDisconnect; 1110 } 1111 EXPORT_SYMBOL(p9_client_begin_disconnect); 1112 1113 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, 1114 const char *uname, kuid_t n_uname, const char *aname) 1115 { 1116 int err = 0; 1117 struct p9_req_t *req; 1118 struct p9_fid *fid; 1119 struct p9_qid qid; 1120 1121 1122 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", 1123 afid ? afid->fid : -1, uname, aname); 1124 fid = p9_fid_create(clnt); 1125 if (!fid) { 1126 err = -ENOMEM; 1127 goto error; 1128 } 1129 fid->uid = n_uname; 1130 1131 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, 1132 afid ? afid->fid : P9_NOFID, uname, aname, n_uname); 1133 if (IS_ERR(req)) { 1134 err = PTR_ERR(req); 1135 goto error; 1136 } 1137 1138 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); 1139 if (err) { 1140 trace_9p_protocol_dump(clnt, req->rc); 1141 p9_free_req(clnt, req); 1142 goto error; 1143 } 1144 1145 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", 1146 qid.type, (unsigned long long)qid.path, qid.version); 1147 1148 memmove(&fid->qid, &qid, sizeof(struct p9_qid)); 1149 1150 p9_free_req(clnt, req); 1151 return fid; 1152 1153 error: 1154 if (fid) 1155 p9_fid_destroy(fid); 1156 return ERR_PTR(err); 1157 } 1158 EXPORT_SYMBOL(p9_client_attach); 1159 1160 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, 1161 const unsigned char * const *wnames, int clone) 1162 { 1163 int err; 1164 struct p9_client *clnt; 1165 struct p9_fid *fid; 1166 struct p9_qid *wqids; 1167 struct p9_req_t *req; 1168 uint16_t nwqids, count; 1169 1170 err = 0; 1171 wqids = NULL; 1172 clnt = oldfid->clnt; 1173 if (clone) { 1174 fid = p9_fid_create(clnt); 1175 if (!fid) { 1176 err = -ENOMEM; 1177 goto error; 1178 } 1179 1180 fid->uid = oldfid->uid; 1181 } else 1182 fid = oldfid; 1183 1184 1185 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", 1186 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); 1187 1188 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, 1189 nwname, wnames); 1190 if (IS_ERR(req)) { 1191 err = PTR_ERR(req); 1192 goto error; 1193 } 1194 1195 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); 1196 if (err) { 1197 trace_9p_protocol_dump(clnt, req->rc); 1198 p9_free_req(clnt, req); 1199 goto clunk_fid; 1200 } 1201 p9_free_req(clnt, req); 1202 1203 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); 1204 1205 if (nwqids != nwname) { 1206 err = -ENOENT; 1207 goto clunk_fid; 1208 } 1209 1210 for (count = 0; count < nwqids; count++) 1211 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", 1212 count, wqids[count].type, 1213 (unsigned long long)wqids[count].path, 1214 wqids[count].version); 1215 1216 if (nwname) 1217 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); 1218 else 1219 fid->qid = oldfid->qid; 1220 1221 kfree(wqids); 1222 return fid; 1223 1224 clunk_fid: 1225 kfree(wqids); 1226 p9_client_clunk(fid); 1227 fid = NULL; 1228 1229 error: 1230 if (fid && (fid != oldfid)) 1231 p9_fid_destroy(fid); 1232 1233 return ERR_PTR(err); 1234 } 1235 EXPORT_SYMBOL(p9_client_walk); 1236 1237 int p9_client_open(struct p9_fid *fid, int mode) 1238 { 1239 int err; 1240 struct p9_client *clnt; 1241 struct p9_req_t *req; 1242 struct p9_qid qid; 1243 int iounit; 1244 1245 clnt = fid->clnt; 1246 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", 1247 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); 1248 err = 0; 1249 1250 if (fid->mode != -1) 1251 return -EINVAL; 1252 1253 if (p9_is_proto_dotl(clnt)) 1254 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); 1255 else 1256 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); 1257 if (IS_ERR(req)) { 1258 err = PTR_ERR(req); 1259 goto error; 1260 } 1261 1262 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1263 if (err) { 1264 trace_9p_protocol_dump(clnt, req->rc); 1265 goto free_and_error; 1266 } 1267 1268 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", 1269 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, 1270 (unsigned long long)qid.path, qid.version, iounit); 1271 1272 fid->mode = mode; 1273 fid->iounit = iounit; 1274 1275 free_and_error: 1276 p9_free_req(clnt, req); 1277 error: 1278 return err; 1279 } 1280 EXPORT_SYMBOL(p9_client_open); 1281 1282 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, 1283 kgid_t gid, struct p9_qid *qid) 1284 { 1285 int err = 0; 1286 struct p9_client *clnt; 1287 struct p9_req_t *req; 1288 int iounit; 1289 1290 p9_debug(P9_DEBUG_9P, 1291 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", 1292 ofid->fid, name, flags, mode, 1293 from_kgid(&init_user_ns, gid)); 1294 clnt = ofid->clnt; 1295 1296 if (ofid->mode != -1) 1297 return -EINVAL; 1298 1299 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, 1300 mode, gid); 1301 if (IS_ERR(req)) { 1302 err = PTR_ERR(req); 1303 goto error; 1304 } 1305 1306 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit); 1307 if (err) { 1308 trace_9p_protocol_dump(clnt, req->rc); 1309 goto free_and_error; 1310 } 1311 1312 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", 1313 qid->type, 1314 (unsigned long long)qid->path, 1315 qid->version, iounit); 1316 1317 ofid->mode = mode; 1318 ofid->iounit = iounit; 1319 1320 free_and_error: 1321 p9_free_req(clnt, req); 1322 error: 1323 return err; 1324 } 1325 EXPORT_SYMBOL(p9_client_create_dotl); 1326 1327 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, 1328 char *extension) 1329 { 1330 int err; 1331 struct p9_client *clnt; 1332 struct p9_req_t *req; 1333 struct p9_qid qid; 1334 int iounit; 1335 1336 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", 1337 fid->fid, name, perm, mode); 1338 err = 0; 1339 clnt = fid->clnt; 1340 1341 if (fid->mode != -1) 1342 return -EINVAL; 1343 1344 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, 1345 mode, extension); 1346 if (IS_ERR(req)) { 1347 err = PTR_ERR(req); 1348 goto error; 1349 } 1350 1351 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); 1352 if (err) { 1353 trace_9p_protocol_dump(clnt, req->rc); 1354 goto free_and_error; 1355 } 1356 1357 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", 1358 qid.type, 1359 (unsigned long long)qid.path, 1360 qid.version, iounit); 1361 1362 fid->mode = mode; 1363 fid->iounit = iounit; 1364 1365 free_and_error: 1366 p9_free_req(clnt, req); 1367 error: 1368 return err; 1369 } 1370 EXPORT_SYMBOL(p9_client_fcreate); 1371 1372 int p9_client_symlink(struct p9_fid *dfid, const char *name, 1373 const char *symtgt, kgid_t gid, struct p9_qid *qid) 1374 { 1375 int err = 0; 1376 struct p9_client *clnt; 1377 struct p9_req_t *req; 1378 1379 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", 1380 dfid->fid, name, symtgt); 1381 clnt = dfid->clnt; 1382 1383 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, 1384 gid); 1385 if (IS_ERR(req)) { 1386 err = PTR_ERR(req); 1387 goto error; 1388 } 1389 1390 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 1391 if (err) { 1392 trace_9p_protocol_dump(clnt, req->rc); 1393 goto free_and_error; 1394 } 1395 1396 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", 1397 qid->type, (unsigned long long)qid->path, qid->version); 1398 1399 free_and_error: 1400 p9_free_req(clnt, req); 1401 error: 1402 return err; 1403 } 1404 EXPORT_SYMBOL(p9_client_symlink); 1405 1406 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) 1407 { 1408 struct p9_client *clnt; 1409 struct p9_req_t *req; 1410 1411 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", 1412 dfid->fid, oldfid->fid, newname); 1413 clnt = dfid->clnt; 1414 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, 1415 newname); 1416 if (IS_ERR(req)) 1417 return PTR_ERR(req); 1418 1419 p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); 1420 p9_free_req(clnt, req); 1421 return 0; 1422 } 1423 EXPORT_SYMBOL(p9_client_link); 1424 1425 int p9_client_fsync(struct p9_fid *fid, int datasync) 1426 { 1427 int err; 1428 struct p9_client *clnt; 1429 struct p9_req_t *req; 1430 1431 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", 1432 fid->fid, datasync); 1433 err = 0; 1434 clnt = fid->clnt; 1435 1436 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); 1437 if (IS_ERR(req)) { 1438 err = PTR_ERR(req); 1439 goto error; 1440 } 1441 1442 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); 1443 1444 p9_free_req(clnt, req); 1445 1446 error: 1447 return err; 1448 } 1449 EXPORT_SYMBOL(p9_client_fsync); 1450 1451 int p9_client_clunk(struct p9_fid *fid) 1452 { 1453 int err; 1454 struct p9_client *clnt; 1455 struct p9_req_t *req; 1456 int retries = 0; 1457 1458 if (!fid) { 1459 pr_warn("%s (%d): Trying to clunk with NULL fid\n", 1460 __func__, task_pid_nr(current)); 1461 dump_stack(); 1462 return 0; 1463 } 1464 1465 again: 1466 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, 1467 retries); 1468 err = 0; 1469 clnt = fid->clnt; 1470 1471 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); 1472 if (IS_ERR(req)) { 1473 err = PTR_ERR(req); 1474 goto error; 1475 } 1476 1477 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); 1478 1479 p9_free_req(clnt, req); 1480 error: 1481 /* 1482 * Fid is not valid even after a failed clunk 1483 * If interrupted, retry once then give up and 1484 * leak fid until umount. 1485 */ 1486 if (err == -ERESTARTSYS) { 1487 if (retries++ == 0) 1488 goto again; 1489 } else 1490 p9_fid_destroy(fid); 1491 return err; 1492 } 1493 EXPORT_SYMBOL(p9_client_clunk); 1494 1495 int p9_client_remove(struct p9_fid *fid) 1496 { 1497 int err; 1498 struct p9_client *clnt; 1499 struct p9_req_t *req; 1500 1501 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); 1502 err = 0; 1503 clnt = fid->clnt; 1504 1505 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); 1506 if (IS_ERR(req)) { 1507 err = PTR_ERR(req); 1508 goto error; 1509 } 1510 1511 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); 1512 1513 p9_free_req(clnt, req); 1514 error: 1515 if (err == -ERESTARTSYS) 1516 p9_client_clunk(fid); 1517 else 1518 p9_fid_destroy(fid); 1519 return err; 1520 } 1521 EXPORT_SYMBOL(p9_client_remove); 1522 1523 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) 1524 { 1525 int err = 0; 1526 struct p9_req_t *req; 1527 struct p9_client *clnt; 1528 1529 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", 1530 dfid->fid, name, flags); 1531 1532 clnt = dfid->clnt; 1533 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); 1534 if (IS_ERR(req)) { 1535 err = PTR_ERR(req); 1536 goto error; 1537 } 1538 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); 1539 1540 p9_free_req(clnt, req); 1541 error: 1542 return err; 1543 } 1544 EXPORT_SYMBOL(p9_client_unlinkat); 1545 1546 int 1547 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) 1548 { 1549 struct p9_client *clnt = fid->clnt; 1550 struct p9_req_t *req; 1551 int total = 0; 1552 *err = 0; 1553 1554 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", 1555 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); 1556 1557 while (iov_iter_count(to)) { 1558 int count = iov_iter_count(to); 1559 int rsize, non_zc = 0; 1560 char *dataptr; 1561 1562 rsize = fid->iounit; 1563 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1564 rsize = clnt->msize - P9_IOHDRSZ; 1565 1566 if (count < rsize) 1567 rsize = count; 1568 1569 /* Don't bother zerocopy for small IO (< 1024) */ 1570 if (clnt->trans_mod->zc_request && rsize > 1024) { 1571 /* 1572 * response header len is 11 1573 * PDU Header(7) + IO Size (4) 1574 */ 1575 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, 1576 0, 11, "dqd", fid->fid, 1577 offset, rsize); 1578 } else { 1579 non_zc = 1; 1580 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, 1581 rsize); 1582 } 1583 if (IS_ERR(req)) { 1584 *err = PTR_ERR(req); 1585 break; 1586 } 1587 1588 *err = p9pdu_readf(req->rc, clnt->proto_version, 1589 "D", &count, &dataptr); 1590 if (*err) { 1591 trace_9p_protocol_dump(clnt, req->rc); 1592 p9_free_req(clnt, req); 1593 break; 1594 } 1595 if (rsize < count) { 1596 pr_err("bogus RREAD count (%d > %d)\n", count, rsize); 1597 count = rsize; 1598 } 1599 1600 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); 1601 if (!count) { 1602 p9_free_req(clnt, req); 1603 break; 1604 } 1605 1606 if (non_zc) { 1607 int n = copy_to_iter(dataptr, count, to); 1608 total += n; 1609 offset += n; 1610 if (n != count) { 1611 *err = -EFAULT; 1612 p9_free_req(clnt, req); 1613 break; 1614 } 1615 } else { 1616 iov_iter_advance(to, count); 1617 total += count; 1618 offset += count; 1619 } 1620 p9_free_req(clnt, req); 1621 } 1622 return total; 1623 } 1624 EXPORT_SYMBOL(p9_client_read); 1625 1626 int 1627 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) 1628 { 1629 struct p9_client *clnt = fid->clnt; 1630 struct p9_req_t *req; 1631 int total = 0; 1632 *err = 0; 1633 1634 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", 1635 fid->fid, (unsigned long long) offset, 1636 iov_iter_count(from)); 1637 1638 while (iov_iter_count(from)) { 1639 int count = iov_iter_count(from); 1640 int rsize = fid->iounit; 1641 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) 1642 rsize = clnt->msize - P9_IOHDRSZ; 1643 1644 if (count < rsize) 1645 rsize = count; 1646 1647 /* Don't bother zerocopy for small IO (< 1024) */ 1648 if (clnt->trans_mod->zc_request && rsize > 1024) { 1649 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, 1650 rsize, P9_ZC_HDR_SZ, "dqd", 1651 fid->fid, offset, rsize); 1652 } else { 1653 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, 1654 offset, rsize, from); 1655 } 1656 if (IS_ERR(req)) { 1657 *err = PTR_ERR(req); 1658 break; 1659 } 1660 1661 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); 1662 if (*err) { 1663 trace_9p_protocol_dump(clnt, req->rc); 1664 p9_free_req(clnt, req); 1665 break; 1666 } 1667 if (rsize < count) { 1668 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); 1669 count = rsize; 1670 } 1671 1672 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); 1673 1674 p9_free_req(clnt, req); 1675 iov_iter_advance(from, count); 1676 total += count; 1677 offset += count; 1678 } 1679 return total; 1680 } 1681 EXPORT_SYMBOL(p9_client_write); 1682 1683 struct p9_wstat *p9_client_stat(struct p9_fid *fid) 1684 { 1685 int err; 1686 struct p9_client *clnt; 1687 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); 1688 struct p9_req_t *req; 1689 u16 ignored; 1690 1691 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); 1692 1693 if (!ret) 1694 return ERR_PTR(-ENOMEM); 1695 1696 err = 0; 1697 clnt = fid->clnt; 1698 1699 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); 1700 if (IS_ERR(req)) { 1701 err = PTR_ERR(req); 1702 goto error; 1703 } 1704 1705 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); 1706 if (err) { 1707 trace_9p_protocol_dump(clnt, req->rc); 1708 p9_free_req(clnt, req); 1709 goto error; 1710 } 1711 1712 p9_debug(P9_DEBUG_9P, 1713 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1714 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1715 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1716 "<<< uid=%d gid=%d n_muid=%d\n", 1717 ret->size, ret->type, ret->dev, ret->qid.type, 1718 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, 1719 ret->atime, ret->mtime, (unsigned long long)ret->length, 1720 ret->name, ret->uid, ret->gid, ret->muid, ret->extension, 1721 from_kuid(&init_user_ns, ret->n_uid), 1722 from_kgid(&init_user_ns, ret->n_gid), 1723 from_kuid(&init_user_ns, ret->n_muid)); 1724 1725 p9_free_req(clnt, req); 1726 return ret; 1727 1728 error: 1729 kfree(ret); 1730 return ERR_PTR(err); 1731 } 1732 EXPORT_SYMBOL(p9_client_stat); 1733 1734 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, 1735 u64 request_mask) 1736 { 1737 int err; 1738 struct p9_client *clnt; 1739 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), 1740 GFP_KERNEL); 1741 struct p9_req_t *req; 1742 1743 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", 1744 fid->fid, request_mask); 1745 1746 if (!ret) 1747 return ERR_PTR(-ENOMEM); 1748 1749 err = 0; 1750 clnt = fid->clnt; 1751 1752 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); 1753 if (IS_ERR(req)) { 1754 err = PTR_ERR(req); 1755 goto error; 1756 } 1757 1758 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret); 1759 if (err) { 1760 trace_9p_protocol_dump(clnt, req->rc); 1761 p9_free_req(clnt, req); 1762 goto error; 1763 } 1764 1765 p9_debug(P9_DEBUG_9P, 1766 "<<< RGETATTR st_result_mask=%lld\n" 1767 "<<< qid=%x.%llx.%x\n" 1768 "<<< st_mode=%8.8x st_nlink=%llu\n" 1769 "<<< st_uid=%d st_gid=%d\n" 1770 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" 1771 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n" 1772 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" 1773 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" 1774 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n" 1775 "<<< st_gen=%lld st_data_version=%lld\n", 1776 ret->st_result_mask, ret->qid.type, ret->qid.path, 1777 ret->qid.version, ret->st_mode, ret->st_nlink, 1778 from_kuid(&init_user_ns, ret->st_uid), 1779 from_kgid(&init_user_ns, ret->st_gid), 1780 ret->st_rdev, ret->st_size, ret->st_blksize, 1781 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, 1782 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, 1783 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, 1784 ret->st_gen, ret->st_data_version); 1785 1786 p9_free_req(clnt, req); 1787 return ret; 1788 1789 error: 1790 kfree(ret); 1791 return ERR_PTR(err); 1792 } 1793 EXPORT_SYMBOL(p9_client_getattr_dotl); 1794 1795 static int p9_client_statsize(struct p9_wstat *wst, int proto_version) 1796 { 1797 int ret; 1798 1799 /* NOTE: size shouldn't include its own length */ 1800 /* size[2] type[2] dev[4] qid[13] */ 1801 /* mode[4] atime[4] mtime[4] length[8]*/ 1802 /* name[s] uid[s] gid[s] muid[s] */ 1803 ret = 2+4+13+4+4+4+8+2+2+2+2; 1804 1805 if (wst->name) 1806 ret += strlen(wst->name); 1807 if (wst->uid) 1808 ret += strlen(wst->uid); 1809 if (wst->gid) 1810 ret += strlen(wst->gid); 1811 if (wst->muid) 1812 ret += strlen(wst->muid); 1813 1814 if ((proto_version == p9_proto_2000u) || 1815 (proto_version == p9_proto_2000L)) { 1816 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ 1817 if (wst->extension) 1818 ret += strlen(wst->extension); 1819 } 1820 1821 return ret; 1822 } 1823 1824 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) 1825 { 1826 int err; 1827 struct p9_req_t *req; 1828 struct p9_client *clnt; 1829 1830 err = 0; 1831 clnt = fid->clnt; 1832 wst->size = p9_client_statsize(wst, clnt->proto_version); 1833 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); 1834 p9_debug(P9_DEBUG_9P, 1835 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" 1836 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" 1837 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" 1838 " uid=%d gid=%d n_muid=%d\n", 1839 wst->size, wst->type, wst->dev, wst->qid.type, 1840 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, 1841 wst->atime, wst->mtime, (unsigned long long)wst->length, 1842 wst->name, wst->uid, wst->gid, wst->muid, wst->extension, 1843 from_kuid(&init_user_ns, wst->n_uid), 1844 from_kgid(&init_user_ns, wst->n_gid), 1845 from_kuid(&init_user_ns, wst->n_muid)); 1846 1847 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); 1848 if (IS_ERR(req)) { 1849 err = PTR_ERR(req); 1850 goto error; 1851 } 1852 1853 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); 1854 1855 p9_free_req(clnt, req); 1856 error: 1857 return err; 1858 } 1859 EXPORT_SYMBOL(p9_client_wstat); 1860 1861 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) 1862 { 1863 int err; 1864 struct p9_req_t *req; 1865 struct p9_client *clnt; 1866 1867 err = 0; 1868 clnt = fid->clnt; 1869 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); 1870 p9_debug(P9_DEBUG_9P, 1871 " valid=%x mode=%x uid=%d gid=%d size=%lld\n" 1872 " atime_sec=%lld atime_nsec=%lld\n" 1873 " mtime_sec=%lld mtime_nsec=%lld\n", 1874 p9attr->valid, p9attr->mode, 1875 from_kuid(&init_user_ns, p9attr->uid), 1876 from_kgid(&init_user_ns, p9attr->gid), 1877 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, 1878 p9attr->mtime_sec, p9attr->mtime_nsec); 1879 1880 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); 1881 1882 if (IS_ERR(req)) { 1883 err = PTR_ERR(req); 1884 goto error; 1885 } 1886 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); 1887 p9_free_req(clnt, req); 1888 error: 1889 return err; 1890 } 1891 EXPORT_SYMBOL(p9_client_setattr); 1892 1893 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) 1894 { 1895 int err; 1896 struct p9_req_t *req; 1897 struct p9_client *clnt; 1898 1899 err = 0; 1900 clnt = fid->clnt; 1901 1902 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); 1903 1904 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); 1905 if (IS_ERR(req)) { 1906 err = PTR_ERR(req); 1907 goto error; 1908 } 1909 1910 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, 1911 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, 1912 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); 1913 if (err) { 1914 trace_9p_protocol_dump(clnt, req->rc); 1915 p9_free_req(clnt, req); 1916 goto error; 1917 } 1918 1919 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " 1920 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " 1921 "fsid %llu namelen %ld\n", 1922 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, 1923 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, 1924 sb->fsid, (long int)sb->namelen); 1925 1926 p9_free_req(clnt, req); 1927 error: 1928 return err; 1929 } 1930 EXPORT_SYMBOL(p9_client_statfs); 1931 1932 int p9_client_rename(struct p9_fid *fid, 1933 struct p9_fid *newdirfid, const char *name) 1934 { 1935 int err; 1936 struct p9_req_t *req; 1937 struct p9_client *clnt; 1938 1939 err = 0; 1940 clnt = fid->clnt; 1941 1942 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", 1943 fid->fid, newdirfid->fid, name); 1944 1945 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, 1946 newdirfid->fid, name); 1947 if (IS_ERR(req)) { 1948 err = PTR_ERR(req); 1949 goto error; 1950 } 1951 1952 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); 1953 1954 p9_free_req(clnt, req); 1955 error: 1956 return err; 1957 } 1958 EXPORT_SYMBOL(p9_client_rename); 1959 1960 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, 1961 struct p9_fid *newdirfid, const char *new_name) 1962 { 1963 int err; 1964 struct p9_req_t *req; 1965 struct p9_client *clnt; 1966 1967 err = 0; 1968 clnt = olddirfid->clnt; 1969 1970 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" 1971 " newdirfid %d new name %s\n", olddirfid->fid, old_name, 1972 newdirfid->fid, new_name); 1973 1974 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, 1975 old_name, newdirfid->fid, new_name); 1976 if (IS_ERR(req)) { 1977 err = PTR_ERR(req); 1978 goto error; 1979 } 1980 1981 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", 1982 newdirfid->fid, new_name); 1983 1984 p9_free_req(clnt, req); 1985 error: 1986 return err; 1987 } 1988 EXPORT_SYMBOL(p9_client_renameat); 1989 1990 /* 1991 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace 1992 */ 1993 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, 1994 const char *attr_name, u64 *attr_size) 1995 { 1996 int err; 1997 struct p9_req_t *req; 1998 struct p9_client *clnt; 1999 struct p9_fid *attr_fid; 2000 2001 err = 0; 2002 clnt = file_fid->clnt; 2003 attr_fid = p9_fid_create(clnt); 2004 if (!attr_fid) { 2005 err = -ENOMEM; 2006 goto error; 2007 } 2008 p9_debug(P9_DEBUG_9P, 2009 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", 2010 file_fid->fid, attr_fid->fid, attr_name); 2011 2012 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", 2013 file_fid->fid, attr_fid->fid, attr_name); 2014 if (IS_ERR(req)) { 2015 err = PTR_ERR(req); 2016 goto error; 2017 } 2018 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size); 2019 if (err) { 2020 trace_9p_protocol_dump(clnt, req->rc); 2021 p9_free_req(clnt, req); 2022 goto clunk_fid; 2023 } 2024 p9_free_req(clnt, req); 2025 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", 2026 attr_fid->fid, *attr_size); 2027 return attr_fid; 2028 clunk_fid: 2029 p9_client_clunk(attr_fid); 2030 attr_fid = NULL; 2031 error: 2032 if (attr_fid && (attr_fid != file_fid)) 2033 p9_fid_destroy(attr_fid); 2034 2035 return ERR_PTR(err); 2036 } 2037 EXPORT_SYMBOL_GPL(p9_client_xattrwalk); 2038 2039 int p9_client_xattrcreate(struct p9_fid *fid, const char *name, 2040 u64 attr_size, int flags) 2041 { 2042 int err; 2043 struct p9_req_t *req; 2044 struct p9_client *clnt; 2045 2046 p9_debug(P9_DEBUG_9P, 2047 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", 2048 fid->fid, name, (long long)attr_size, flags); 2049 err = 0; 2050 clnt = fid->clnt; 2051 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", 2052 fid->fid, name, attr_size, flags); 2053 if (IS_ERR(req)) { 2054 err = PTR_ERR(req); 2055 goto error; 2056 } 2057 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); 2058 p9_free_req(clnt, req); 2059 error: 2060 return err; 2061 } 2062 EXPORT_SYMBOL_GPL(p9_client_xattrcreate); 2063 2064 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) 2065 { 2066 int err, rsize, non_zc = 0; 2067 struct p9_client *clnt; 2068 struct p9_req_t *req; 2069 char *dataptr; 2070 struct kvec kv = {.iov_base = data, .iov_len = count}; 2071 struct iov_iter to; 2072 2073 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count); 2074 2075 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", 2076 fid->fid, (unsigned long long) offset, count); 2077 2078 err = 0; 2079 clnt = fid->clnt; 2080 2081 rsize = fid->iounit; 2082 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) 2083 rsize = clnt->msize - P9_READDIRHDRSZ; 2084 2085 if (count < rsize) 2086 rsize = count; 2087 2088 /* Don't bother zerocopy for small IO (< 1024) */ 2089 if (clnt->trans_mod->zc_request && rsize > 1024) { 2090 /* 2091 * response header len is 11 2092 * PDU Header(7) + IO Size (4) 2093 */ 2094 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, 2095 11, "dqd", fid->fid, offset, rsize); 2096 } else { 2097 non_zc = 1; 2098 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, 2099 offset, rsize); 2100 } 2101 if (IS_ERR(req)) { 2102 err = PTR_ERR(req); 2103 goto error; 2104 } 2105 2106 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); 2107 if (err) { 2108 trace_9p_protocol_dump(clnt, req->rc); 2109 goto free_and_error; 2110 } 2111 if (rsize < count) { 2112 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); 2113 count = rsize; 2114 } 2115 2116 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); 2117 2118 if (non_zc) 2119 memmove(data, dataptr, count); 2120 2121 p9_free_req(clnt, req); 2122 return count; 2123 2124 free_and_error: 2125 p9_free_req(clnt, req); 2126 error: 2127 return err; 2128 } 2129 EXPORT_SYMBOL(p9_client_readdir); 2130 2131 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, 2132 dev_t rdev, kgid_t gid, struct p9_qid *qid) 2133 { 2134 int err; 2135 struct p9_client *clnt; 2136 struct p9_req_t *req; 2137 2138 err = 0; 2139 clnt = fid->clnt; 2140 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " 2141 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); 2142 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, 2143 MAJOR(rdev), MINOR(rdev), gid); 2144 if (IS_ERR(req)) 2145 return PTR_ERR(req); 2146 2147 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2148 if (err) { 2149 trace_9p_protocol_dump(clnt, req->rc); 2150 goto error; 2151 } 2152 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, 2153 (unsigned long long)qid->path, qid->version); 2154 2155 error: 2156 p9_free_req(clnt, req); 2157 return err; 2158 2159 } 2160 EXPORT_SYMBOL(p9_client_mknod_dotl); 2161 2162 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, 2163 kgid_t gid, struct p9_qid *qid) 2164 { 2165 int err; 2166 struct p9_client *clnt; 2167 struct p9_req_t *req; 2168 2169 err = 0; 2170 clnt = fid->clnt; 2171 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", 2172 fid->fid, name, mode, from_kgid(&init_user_ns, gid)); 2173 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, 2174 gid); 2175 if (IS_ERR(req)) 2176 return PTR_ERR(req); 2177 2178 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid); 2179 if (err) { 2180 trace_9p_protocol_dump(clnt, req->rc); 2181 goto error; 2182 } 2183 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, 2184 (unsigned long long)qid->path, qid->version); 2185 2186 error: 2187 p9_free_req(clnt, req); 2188 return err; 2189 2190 } 2191 EXPORT_SYMBOL(p9_client_mkdir_dotl); 2192 2193 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) 2194 { 2195 int err; 2196 struct p9_client *clnt; 2197 struct p9_req_t *req; 2198 2199 err = 0; 2200 clnt = fid->clnt; 2201 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " 2202 "start %lld length %lld proc_id %d client_id %s\n", 2203 fid->fid, flock->type, flock->flags, flock->start, 2204 flock->length, flock->proc_id, flock->client_id); 2205 2206 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, 2207 flock->flags, flock->start, flock->length, 2208 flock->proc_id, flock->client_id); 2209 2210 if (IS_ERR(req)) 2211 return PTR_ERR(req); 2212 2213 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status); 2214 if (err) { 2215 trace_9p_protocol_dump(clnt, req->rc); 2216 goto error; 2217 } 2218 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); 2219 error: 2220 p9_free_req(clnt, req); 2221 return err; 2222 2223 } 2224 EXPORT_SYMBOL(p9_client_lock_dotl); 2225 2226 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) 2227 { 2228 int err; 2229 struct p9_client *clnt; 2230 struct p9_req_t *req; 2231 2232 err = 0; 2233 clnt = fid->clnt; 2234 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " 2235 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type, 2236 glock->start, glock->length, glock->proc_id, glock->client_id); 2237 2238 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, 2239 glock->start, glock->length, glock->proc_id, glock->client_id); 2240 2241 if (IS_ERR(req)) 2242 return PTR_ERR(req); 2243 2244 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type, 2245 &glock->start, &glock->length, &glock->proc_id, 2246 &glock->client_id); 2247 if (err) { 2248 trace_9p_protocol_dump(clnt, req->rc); 2249 goto error; 2250 } 2251 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " 2252 "proc_id %d client_id %s\n", glock->type, glock->start, 2253 glock->length, glock->proc_id, glock->client_id); 2254 error: 2255 p9_free_req(clnt, req); 2256 return err; 2257 } 2258 EXPORT_SYMBOL(p9_client_getlock_dotl); 2259 2260 int p9_client_readlink(struct p9_fid *fid, char **target) 2261 { 2262 int err; 2263 struct p9_client *clnt; 2264 struct p9_req_t *req; 2265 2266 err = 0; 2267 clnt = fid->clnt; 2268 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); 2269 2270 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); 2271 if (IS_ERR(req)) 2272 return PTR_ERR(req); 2273 2274 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target); 2275 if (err) { 2276 trace_9p_protocol_dump(clnt, req->rc); 2277 goto error; 2278 } 2279 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); 2280 error: 2281 p9_free_req(clnt, req); 2282 return err; 2283 } 2284 EXPORT_SYMBOL(p9_client_readlink); 2285